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Block layer patches 

- virtio-blk: Multiqueue support (configurable iothread per queue)
 - Made NBD export and hw/scsi thread-safe without AioContext lock
 - Fix crash when loading snapshot on inactive node
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Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- virtio-blk: Multiqueue support (configurable iothread per queue)
- Made NBD export and hw/scsi thread-safe without AioContext lock
- Fix crash when loading snapshot on inactive node

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# gpg: Signature made Thu 21 Dec 2023 18:02:23 EST
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin: (33 commits)
  virtio-blk: add iothread-vq-mapping parameter
  qdev: add IOThreadVirtQueueMappingList property type
  qdev-properties: alias all object class properties
  string-output-visitor: show structs as "<omitted>"
  block-coroutine-wrapper: use qemu_get_current_aio_context()
  block: remove outdated AioContext locking comments
  job: remove outdated AioContext locking comments
  scsi: remove outdated AioContext lock comment
  docs: remove AioContext lock from IOThread docs
  aio: remove aio_context_acquire()/aio_context_release() API
  aio-wait: draw equivalence between AIO_WAIT_WHILE() and AIO_WAIT_WHILE_UNLOCKED()
  scsi: remove AioContext locking
  block: remove bdrv_co_lock()
  block: remove AioContext locking
  graph-lock: remove AioContext locking
  aio: make aio_context_acquire()/aio_context_release() a no-op
  tests: remove aio_context_acquire() tests
  scsi: assert that callbacks run in the correct AioContext
  virtio-scsi: replace AioContext lock with tmf_bh_lock
  dma-helpers: don't lock AioContext in dma_blk_cb()
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-12-21 19:43:58 -05:00
parent 191710c221 b6948ab01d
commit 6370d13c62
82 changed files with 1341 additions and 2041 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

363
block.c
View File

@ -1616,16 +1616,10 @@ out:
g_free(gen_node_name);
}
/*
* The caller must always hold @bs AioContext lock, because this function calls
* bdrv_refresh_total_sectors() which polls when called from non-coroutine
* context.
*/
static int no_coroutine_fn GRAPH_UNLOCKED
bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name,
QDict *options, int open_flags, Error **errp)
{
AioContext *ctx;
Error *local_err = NULL;
int i, ret;
GLOBAL_STATE_CODE();
@ -1673,21 +1667,15 @@ bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name,
bs->supported_read_flags |= BDRV_REQ_REGISTERED_BUF;
bs->supported_write_flags |= BDRV_REQ_REGISTERED_BUF;
/* Get the context after .bdrv_open, it can change the context */
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
ret = bdrv_refresh_total_sectors(bs, bs->total_sectors);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not refresh total sector count");
aio_context_release(ctx);
return ret;
}
bdrv_graph_rdlock_main_loop();
bdrv_refresh_limits(bs, NULL, &local_err);
bdrv_graph_rdunlock_main_loop();
aio_context_release(ctx);
if (local_err) {
error_propagate(errp, local_err);
@ -1708,12 +1696,12 @@ bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name,
open_failed:
bs->drv = NULL;
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
if (bs->file != NULL) {
bdrv_unref_child(bs, bs->file);
assert(!bs->file);
}
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
g_free(bs->opaque);
bs->opaque = NULL;
@ -2908,7 +2896,7 @@ uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm)
* Replaces the node that a BdrvChild points to without updating permissions.
*
* If @new_bs is non-NULL, the parent of @child must already be drained through
* @child and the caller must hold the AioContext lock for @new_bs.
* @child.
*/
static void GRAPH_WRLOCK
bdrv_replace_child_noperm(BdrvChild *child, BlockDriverState *new_bs)
@ -3048,9 +3036,8 @@ static TransactionActionDrv bdrv_attach_child_common_drv = {
*
* Returns new created child.
*
* The caller must hold the AioContext lock for @child_bs. Both @parent_bs and
* @child_bs can move to a different AioContext in this function. Callers must
* make sure that their AioContext locking is still correct after this.
* Both @parent_bs and @child_bs can move to a different AioContext in this
* function.
*/
static BdrvChild * GRAPH_WRLOCK
bdrv_attach_child_common(BlockDriverState *child_bs,
@ -3062,7 +3049,7 @@ bdrv_attach_child_common(BlockDriverState *child_bs,
Transaction *tran, Error **errp)
{
BdrvChild *new_child;
AioContext *parent_ctx, *new_child_ctx;
AioContext *parent_ctx;
AioContext *child_ctx = bdrv_get_aio_context(child_bs);
assert(child_class->get_parent_desc);
@ -3114,12 +3101,6 @@ bdrv_attach_child_common(BlockDriverState *child_bs,
}
}
new_child_ctx = bdrv_get_aio_context(child_bs);
if (new_child_ctx != child_ctx) {
aio_context_release(child_ctx);
aio_context_acquire(new_child_ctx);
}
bdrv_ref(child_bs);
/*
* Let every new BdrvChild start with a drained parent. Inserting the child
@ -3149,20 +3130,14 @@ bdrv_attach_child_common(BlockDriverState *child_bs,
};
tran_add(tran, &bdrv_attach_child_common_drv, s);
if (new_child_ctx != child_ctx) {
aio_context_release(new_child_ctx);
aio_context_acquire(child_ctx);
}
return new_child;
}
/*
* Function doesn't update permissions, caller is responsible for this.
*
* The caller must hold the AioContext lock for @child_bs. Both @parent_bs and
* @child_bs can move to a different AioContext in this function. Callers must
* make sure that their AioContext locking is still correct after this.
* Both @parent_bs and @child_bs can move to a different AioContext in this
* function.
*
* After calling this function, the transaction @tran may only be completed
* while holding a writer lock for the graph.
@ -3202,9 +3177,6 @@ bdrv_attach_child_noperm(BlockDriverState *parent_bs,
*
* On failure NULL is returned, errp is set and the reference to
* child_bs is also dropped.
*
* The caller must hold the AioContext lock @child_bs, but not that of @ctx
* (unless @child_bs is already in @ctx).
*/
BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
const char *child_name,
@ -3244,9 +3216,6 @@ out:
*
* On failure NULL is returned, errp is set and the reference to
* child_bs is also dropped.
*
* If @parent_bs and @child_bs are in different AioContexts, the caller must
* hold the AioContext lock for @child_bs, but not for @parent_bs.
*/
BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
BlockDriverState *child_bs,
@ -3436,9 +3405,8 @@ static BdrvChildRole bdrv_backing_role(BlockDriverState *bs)
*
* Function doesn't update permissions, caller is responsible for this.
*
* The caller must hold the AioContext lock for @child_bs. Both @parent_bs and
* @child_bs can move to a different AioContext in this function. Callers must
* make sure that their AioContext locking is still correct after this.
* Both @parent_bs and @child_bs can move to a different AioContext in this
* function.
*
* After calling this function, the transaction @tran may only be completed
* while holding a writer lock for the graph.
@ -3531,9 +3499,8 @@ out:
}
/*
* The caller must hold the AioContext lock for @backing_hd. Both @bs and
* @backing_hd can move to a different AioContext in this function. Callers must
* make sure that their AioContext locking is still correct after this.
* Both @bs and @backing_hd can move to a different AioContext in this
* function.
*
* If a backing child is already present (i.e. we're detaching a node), that
* child node must be drained.
@ -3575,9 +3542,9 @@ int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
bdrv_ref(drain_bs);
bdrv_drained_begin(drain_bs);
bdrv_graph_wrlock(backing_hd);
bdrv_graph_wrlock();
ret = bdrv_set_backing_hd_drained(bs, backing_hd, errp);
bdrv_graph_wrunlock(backing_hd);
bdrv_graph_wrunlock();
bdrv_drained_end(drain_bs);
bdrv_unref(drain_bs);
@ -3592,8 +3559,6 @@ int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
* itself, all options starting with "${bdref_key}." are considered part of the
* BlockdevRef.
*
* The caller must hold the main AioContext lock.
*
* TODO Can this be unified with bdrv_open_image()?
*/
int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
@ -3605,7 +3570,6 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
int ret = 0;
bool implicit_backing = false;
BlockDriverState *backing_hd;
AioContext *backing_hd_ctx;
QDict *options;
QDict *tmp_parent_options = NULL;
Error *local_err = NULL;
@ -3691,11 +3655,8 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
/* Hook up the backing file link; drop our reference, bs owns the
* backing_hd reference now */
backing_hd_ctx = bdrv_get_aio_context(backing_hd);
aio_context_acquire(backing_hd_ctx);
ret = bdrv_set_backing_hd(bs, backing_hd, errp);
bdrv_unref(backing_hd);
aio_context_release(backing_hd_ctx);
if (ret < 0) {
goto free_exit;
@ -3767,9 +3728,7 @@ done:
*
* The BlockdevRef will be removed from the options QDict.
*
* The caller must hold the lock of the main AioContext and no other AioContext.
* @parent can move to a different AioContext in this function. Callers must
* make sure that their AioContext locking is still correct after this.
* @parent can move to a different AioContext in this function.
*/
BdrvChild *bdrv_open_child(const char *filename,
QDict *options, const char *bdref_key,
@ -3780,7 +3739,6 @@ BdrvChild *bdrv_open_child(const char *filename,
{
BlockDriverState *bs;
BdrvChild *child;
AioContext *ctx;
GLOBAL_STATE_CODE();
@ -3790,13 +3748,10 @@ BdrvChild *bdrv_open_child(const char *filename,
return NULL;
}
bdrv_graph_wrlock(NULL);
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_graph_wrlock();
child = bdrv_attach_child(parent, bs, bdref_key, child_class, child_role,
errp);
aio_context_release(ctx);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
return child;
}
@ -3804,9 +3759,7 @@ BdrvChild *bdrv_open_child(const char *filename,
/*
* Wrapper on bdrv_open_child() for most popular case: open primary child of bs.
*
* The caller must hold the lock of the main AioContext and no other AioContext.
* @parent can move to a different AioContext in this function. Callers must
* make sure that their AioContext locking is still correct after this.
* @parent can move to a different AioContext in this function.
*/
int bdrv_open_file_child(const char *filename,
QDict *options, const char *bdref_key,
@ -3881,7 +3834,6 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
int64_t total_size;
QemuOpts *opts = NULL;
BlockDriverState *bs_snapshot = NULL;
AioContext *ctx = bdrv_get_aio_context(bs);
int ret;
GLOBAL_STATE_CODE();
@ -3890,9 +3842,7 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
instead of opening 'filename' directly */
/* Get the required size from the image */
aio_context_acquire(ctx);
total_size = bdrv_getlength(bs);
aio_context_release(ctx);
if (total_size < 0) {
error_setg_errno(errp, -total_size, "Could not get image size");
@ -3927,10 +3877,7 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
goto out;
}
aio_context_acquire(ctx);
ret = bdrv_append(bs_snapshot, bs, errp);
aio_context_release(ctx);
if (ret < 0) {
bs_snapshot = NULL;
goto out;
@ -3955,8 +3902,6 @@ out:
* The reference parameter may be used to specify an existing block device which
* should be opened. If specified, neither options nor a filename may be given,
* nor can an existing BDS be reused (that is, *pbs has to be NULL).
*
* The caller must always hold the main AioContext lock.
*/
static BlockDriverState * no_coroutine_fn
bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
@ -3974,7 +3919,6 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
Error *local_err = NULL;
QDict *snapshot_options = NULL;
int snapshot_flags = 0;
AioContext *ctx = qemu_get_aio_context();
assert(!child_class || !flags);
assert(!child_class == !parent);
@ -4115,12 +4059,10 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
/* Not requesting BLK_PERM_CONSISTENT_READ because we're only
* looking at the header to guess the image format. This works even
* in cases where a guest would not see a consistent state. */
ctx = bdrv_get_aio_context(file_bs);
aio_context_acquire(ctx);
AioContext *ctx = bdrv_get_aio_context(file_bs);
file = blk_new(ctx, 0, BLK_PERM_ALL);
blk_insert_bs(file, file_bs, &local_err);
bdrv_unref(file_bs);
aio_context_release(ctx);
if (local_err) {
goto fail;
@ -4167,13 +4109,8 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
goto fail;
}
/* The AioContext could have changed during bdrv_open_common() */
ctx = bdrv_get_aio_context(bs);
if (file) {
aio_context_acquire(ctx);
blk_unref(file);
aio_context_release(ctx);
file = NULL;
}
@ -4231,16 +4168,13 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
* (snapshot_bs); thus, we have to drop the strong reference to bs
* (which we obtained by calling bdrv_new()). bs will not be deleted,
* though, because the overlay still has a reference to it. */
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
bs = snapshot_bs;
}
return bs;
fail:
aio_context_acquire(ctx);
blk_unref(file);
qobject_unref(snapshot_options);
qobject_unref(bs->explicit_options);
@ -4249,21 +4183,17 @@ fail:
bs->options = NULL;
bs->explicit_options = NULL;
bdrv_unref(bs);
aio_context_release(ctx);
error_propagate(errp, local_err);
return NULL;
close_and_fail:
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
qobject_unref(snapshot_options);
qobject_unref(options);
error_propagate(errp, local_err);
return NULL;
}
/* The caller must always hold the main AioContext lock. */
BlockDriverState *bdrv_open(const char *filename, const char *reference,
QDict *options, int flags, Error **errp)
{
@ -4540,12 +4470,7 @@ void bdrv_reopen_queue_free(BlockReopenQueue *bs_queue)
if (bs_queue) {
BlockReopenQueueEntry *bs_entry, *next;
QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) {
AioContext *ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
bdrv_drained_end(bs_entry->state.bs);
aio_context_release(ctx);
qobject_unref(bs_entry->state.explicit_options);
qobject_unref(bs_entry->state.options);
g_free(bs_entry);
@ -4577,7 +4502,6 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
{
int ret = -1;
BlockReopenQueueEntry *bs_entry, *next;
AioContext *ctx;
Transaction *tran = tran_new();
g_autoptr(GSList) refresh_list = NULL;
@ -4586,10 +4510,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
GLOBAL_STATE_CODE();
QTAILQ_FOREACH(bs_entry, bs_queue, entry) {
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
ret = bdrv_flush(bs_entry->state.bs);
aio_context_release(ctx);
if (ret < 0) {
error_setg_errno(errp, -ret, "Error flushing drive");
goto abort;
@ -4598,10 +4519,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
QTAILQ_FOREACH(bs_entry, bs_queue, entry) {
assert(bs_entry->state.bs->quiesce_counter > 0);
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
ret = bdrv_reopen_prepare(&bs_entry->state, bs_queue, tran, errp);
aio_context_release(ctx);
if (ret < 0) {
goto abort;
}
@ -4644,24 +4562,18 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
* to first element.
*/
QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) {
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
bdrv_reopen_commit(&bs_entry->state);
aio_context_release(ctx);
}
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
tran_commit(tran);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) {
BlockDriverState *bs = bs_entry->state.bs;
if (bs->drv->bdrv_reopen_commit_post) {
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bs->drv->bdrv_reopen_commit_post(&bs_entry->state);
aio_context_release(ctx);
}
}
@ -4669,16 +4581,13 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
goto cleanup;
abort:
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
tran_abort(tran);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) {
if (bs_entry->prepared) {
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
bdrv_reopen_abort(&bs_entry->state);
aio_context_release(ctx);
}
}
@ -4691,24 +4600,13 @@ cleanup:
int bdrv_reopen(BlockDriverState *bs, QDict *opts, bool keep_old_opts,
Error **errp)
{
AioContext *ctx = bdrv_get_aio_context(bs);
BlockReopenQueue *queue;
int ret;
GLOBAL_STATE_CODE();
queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts);
if (ctx != qemu_get_aio_context()) {
aio_context_release(ctx);
}
ret = bdrv_reopen_multiple(queue, errp);
if (ctx != qemu_get_aio_context()) {
aio_context_acquire(ctx);
}
return ret;
return bdrv_reopen_multiple(queue, errp);
}
int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only,
@ -4743,10 +4641,7 @@ int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only,
*
* Return 0 on success, otherwise return < 0 and set @errp.
*
* The caller must hold the AioContext lock of @reopen_state->bs.
* @reopen_state->bs can move to a different AioContext in this function.
* Callers must make sure that their AioContext locking is still correct after
* this.
*/
static int GRAPH_UNLOCKED
bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state,
@ -4760,7 +4655,6 @@ bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state,
const char *child_name = is_backing ? "backing" : "file";
QObject *value;
const char *str;
AioContext *ctx, *old_ctx;
bool has_child;
int ret;
@ -4844,25 +4738,13 @@ bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state,
bdrv_drained_begin(old_child_bs);
}
old_ctx = bdrv_get_aio_context(bs);
ctx = bdrv_get_aio_context(new_child_bs);
if (old_ctx != ctx) {
aio_context_release(old_ctx);
aio_context_acquire(ctx);
}
bdrv_graph_rdunlock_main_loop();
bdrv_graph_wrlock(new_child_bs);
bdrv_graph_wrlock();
ret = bdrv_set_file_or_backing_noperm(bs, new_child_bs, is_backing,
tran, errp);
bdrv_graph_wrunlock_ctx(ctx);
if (old_ctx != ctx) {
aio_context_release(ctx);
aio_context_acquire(old_ctx);
}
bdrv_graph_wrunlock();
if (old_child_bs) {
bdrv_drained_end(old_child_bs);
@ -4892,8 +4774,6 @@ out_rdlock:
* It is the responsibility of the caller to then call the abort() or
* commit() for any other BDS that have been left in a prepare() state
*
* The caller must hold the AioContext lock of @reopen_state->bs.
*
* After calling this function, the transaction @change_child_tran may only be
* completed while holding a writer lock for the graph.
*/
@ -5209,14 +5089,14 @@ static void bdrv_close(BlockDriverState *bs)
bs->drv = NULL;
}
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
QLIST_FOREACH_SAFE(child, &bs->children, next, next) {
bdrv_unref_child(bs, child);
}
assert(!bs->backing);
assert(!bs->file);
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
g_free(bs->opaque);
bs->opaque = NULL;
@ -5509,9 +5389,9 @@ int bdrv_drop_filter(BlockDriverState *bs, Error **errp)
bdrv_graph_rdunlock_main_loop();
bdrv_drained_begin(child_bs);
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
ret = bdrv_replace_node_common(bs, child_bs, true, true, errp);
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
bdrv_drained_end(child_bs);
return ret;
@ -5528,8 +5408,6 @@ int bdrv_drop_filter(BlockDriverState *bs, Error **errp)
* child.
*
* This function does not create any image files.
*
* The caller must hold the AioContext lock for @bs_top.
*/
int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
Error **errp)
@ -5537,7 +5415,6 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
int ret;
BdrvChild *child;
Transaction *tran = tran_new();
AioContext *old_context, *new_context = NULL;
GLOBAL_STATE_CODE();
@ -5545,23 +5422,10 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
assert(!bs_new->backing);
bdrv_graph_rdunlock_main_loop();
old_context = bdrv_get_aio_context(bs_top);
bdrv_drained_begin(bs_top);
/*
* bdrv_drained_begin() requires that only the AioContext of the drained
* node is locked, and at this point it can still differ from the AioContext
* of bs_top.
*/
new_context = bdrv_get_aio_context(bs_new);
aio_context_release(old_context);
aio_context_acquire(new_context);
bdrv_drained_begin(bs_new);
aio_context_release(new_context);
aio_context_acquire(old_context);
new_context = NULL;
bdrv_graph_wrlock(bs_top);
bdrv_graph_wrlock();
child = bdrv_attach_child_noperm(bs_new, bs_top, "backing",
&child_of_bds, bdrv_backing_role(bs_new),
@ -5571,18 +5435,6 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
goto out;
}
/*
* bdrv_attach_child_noperm could change the AioContext of bs_top and
* bs_new, but at least they are in the same AioContext now. This is the
* AioContext that we need to lock for the rest of the function.
*/
new_context = bdrv_get_aio_context(bs_top);
if (old_context != new_context) {
aio_context_release(old_context);
aio_context_acquire(new_context);
}
ret = bdrv_replace_node_noperm(bs_top, bs_new, true, tran, errp);
if (ret < 0) {
goto out;
@ -5593,16 +5445,11 @@ out:
tran_finalize(tran, ret);
bdrv_refresh_limits(bs_top, NULL, NULL);
bdrv_graph_wrunlock(bs_top);
bdrv_graph_wrunlock();
bdrv_drained_end(bs_top);
bdrv_drained_end(bs_new);
if (new_context && old_context != new_context) {
aio_context_release(new_context);
aio_context_acquire(old_context);
}
return ret;
}
@ -5620,7 +5467,7 @@ int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs,
bdrv_ref(old_bs);
bdrv_drained_begin(old_bs);
bdrv_drained_begin(new_bs);
bdrv_graph_wrlock(new_bs);
bdrv_graph_wrlock();
bdrv_replace_child_tran(child, new_bs, tran);
@ -5631,7 +5478,7 @@ int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs,
tran_finalize(tran, ret);
bdrv_graph_wrunlock(new_bs);
bdrv_graph_wrunlock();
bdrv_drained_end(old_bs);
bdrv_drained_end(new_bs);
bdrv_unref(old_bs);
@ -5667,9 +5514,8 @@ static void bdrv_delete(BlockDriverState *bs)
* after the call (even on failure), so if the caller intends to reuse the
* dictionary, it needs to use qobject_ref() before calling bdrv_open.
*
* The caller holds the AioContext lock for @bs. It must make sure that @bs
* stays in the same AioContext, i.e. @options must not refer to nodes in a
* different AioContext.
* The caller must make sure that @bs stays in the same AioContext, i.e.
* @options must not refer to nodes in a different AioContext.
*/
BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options,
int flags, Error **errp)
@ -5697,12 +5543,8 @@ BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options,
GLOBAL_STATE_CODE();
aio_context_release(ctx);
aio_context_acquire(qemu_get_aio_context());
new_node_bs = bdrv_new_open_driver_opts(drv, node_name, options, flags,
errp);
aio_context_release(qemu_get_aio_context());
aio_context_acquire(ctx);
assert(bdrv_get_aio_context(bs) == ctx);
options = NULL; /* bdrv_new_open_driver() eats options */
@ -5718,9 +5560,9 @@ BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options,
bdrv_ref(bs);
bdrv_drained_begin(bs);
bdrv_drained_begin(new_node_bs);
bdrv_graph_wrlock(new_node_bs);
bdrv_graph_wrlock();
ret = bdrv_replace_node(bs, new_node_bs, errp);
bdrv_graph_wrunlock(new_node_bs);
bdrv_graph_wrunlock();
bdrv_drained_end(new_node_bs);
bdrv_drained_end(bs);
bdrv_unref(bs);
@ -5975,7 +5817,7 @@ int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base,
bdrv_ref(top);
bdrv_drained_begin(base);
bdrv_graph_wrlock(base);
bdrv_graph_wrlock();
if (!top->drv || !base->drv) {
goto exit_wrlock;
@ -6015,7 +5857,7 @@ int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base,
* That's a FIXME.
*/
bdrv_replace_node_common(top, base, false, false, &local_err);
bdrv_graph_wrunlock(base);
bdrv_graph_wrunlock();
if (local_err) {
error_report_err(local_err);
@ -6052,7 +5894,7 @@ int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base,
goto exit;
exit_wrlock:
bdrv_graph_wrunlock(base);
bdrv_graph_wrunlock();
exit:
bdrv_drained_end(base);
bdrv_unref(top);
@ -7037,12 +6879,9 @@ void bdrv_activate_all(Error **errp)
GRAPH_RDLOCK_GUARD_MAINLOOP();
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
AioContext *aio_context = bdrv_get_aio_context(bs);
int ret;
aio_context_acquire(aio_context);
ret = bdrv_activate(bs, errp);
aio_context_release(aio_context);
if (ret < 0) {
bdrv_next_cleanup(&it);
return;
@ -7137,20 +6976,10 @@ int bdrv_inactivate_all(void)
BlockDriverState *bs = NULL;
BdrvNextIterator it;
int ret = 0;
GSList *aio_ctxs = NULL, *ctx;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
AioContext *aio_context = bdrv_get_aio_context(bs);
if (!g_slist_find(aio_ctxs, aio_context)) {
aio_ctxs = g_slist_prepend(aio_ctxs, aio_context);
aio_context_acquire(aio_context);
}
}
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
/* Nodes with BDS parents are covered by recursion from the last
* parent that gets inactivated. Don't inactivate them a second
@ -7161,17 +6990,10 @@ int bdrv_inactivate_all(void)
ret = bdrv_inactivate_recurse(bs);
if (ret < 0) {
bdrv_next_cleanup(&it);
goto out;
break;
}
}
out:
for (ctx = aio_ctxs; ctx != NULL; ctx = ctx->next) {
AioContext *aio_context = ctx->data;
aio_context_release(aio_context);
}
g_slist_free(aio_ctxs);
return ret;
}
@ -7257,11 +7079,8 @@ void bdrv_unref(BlockDriverState *bs)
static void bdrv_schedule_unref_bh(void *opaque)
{
BlockDriverState *bs = opaque;
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
}
/*
@ -7398,8 +7217,6 @@ void bdrv_img_create(const char *filename, const char *fmt,
return;
}
aio_context_acquire(qemu_get_aio_context());
/* Create parameter list */
create_opts = qemu_opts_append(create_opts, drv->create_opts);
create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
@ -7549,7 +7366,6 @@ out:
qemu_opts_del(opts);
qemu_opts_free(create_opts);
error_propagate(errp, local_err);
aio_context_release(qemu_get_aio_context());
}
AioContext *bdrv_get_aio_context(BlockDriverState *bs)
@ -7583,33 +7399,6 @@ void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx)
bdrv_dec_in_flight(bs);
}
void coroutine_fn bdrv_co_lock(BlockDriverState *bs)
{
AioContext *ctx = bdrv_get_aio_context(bs);
/* In the main thread, bs->aio_context won't change concurrently */
assert(qemu_get_current_aio_context() == qemu_get_aio_context());
/*
* We're in coroutine context, so we already hold the lock of the main
* loop AioContext. Don't lock it twice to avoid deadlocks.
*/
assert(qemu_in_coroutine());
if (ctx != qemu_get_aio_context()) {
aio_context_acquire(ctx);
}
}
void coroutine_fn bdrv_co_unlock(BlockDriverState *bs)
{
AioContext *ctx = bdrv_get_aio_context(bs);
assert(qemu_in_coroutine());
if (ctx != qemu_get_aio_context()) {
aio_context_release(ctx);
}
}
static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban)
{
GLOBAL_STATE_CODE();
@ -7728,21 +7517,8 @@ static void bdrv_set_aio_context_commit(void *opaque)
BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque;
BlockDriverState *bs = (BlockDriverState *) state->bs;
AioContext *new_context = state->new_ctx;
AioContext *old_context = bdrv_get_aio_context(bs);
/*
* Take the old AioContex when detaching it from bs.
* At this point, new_context lock is already acquired, and we are now
* also taking old_context. This is safe as long as bdrv_detach_aio_context
* does not call AIO_POLL_WHILE().
*/
if (old_context != qemu_get_aio_context()) {
aio_context_acquire(old_context);
}
bdrv_detach_aio_context(bs);
if (old_context != qemu_get_aio_context()) {
aio_context_release(old_context);
}
bdrv_attach_aio_context(bs, new_context);
}
@ -7757,10 +7533,6 @@ static TransactionActionDrv set_aio_context = {
*
* Must be called from the main AioContext.
*
* The caller must own the AioContext lock for the old AioContext of bs, but it
* must not own the AioContext lock for new_context (unless new_context is the
* same as the current context of bs).
*
* @visited will accumulate all visited BdrvChild objects. The caller is
* responsible for freeing the list afterwards.
*/
@ -7813,13 +7585,6 @@ static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx,
*
* If ignore_child is not NULL, that child (and its subgraph) will not
* be touched.
*
* This function still requires the caller to take the bs current
* AioContext lock, otherwise draining will fail since AIO_WAIT_WHILE
* assumes the lock is always held if bs is in another AioContext.
* For the same reason, it temporarily also holds the new AioContext, since
* bdrv_drained_end calls BDRV_POLL_WHILE that assumes the lock is taken too.
* Therefore the new AioContext lock must not be taken by the caller.
*/
int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
BdrvChild *ignore_child, Error **errp)
@ -7827,7 +7592,6 @@ int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
Transaction *tran;
GHashTable *visited;
int ret;
AioContext *old_context = bdrv_get_aio_context(bs);
GLOBAL_STATE_CODE();
/*
@ -7846,8 +7610,8 @@ int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
/*
* Linear phase: go through all callbacks collected in the transaction.
* Run all callbacks collected in the recursion to switch all nodes
* AioContext lock (transaction commit), or undo all changes done in the
* Run all callbacks collected in the recursion to switch every node's
* AioContext (transaction commit), or undo all changes done in the
* recursion (transaction abort).
*/
@ -7857,34 +7621,7 @@ int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
return -EPERM;
}
/*
* Release old AioContext, it won't be needed anymore, as all
* bdrv_drained_begin() have been called already.
*/
if (qemu_get_aio_context() != old_context) {
aio_context_release(old_context);
}
/*
* Acquire new AioContext since bdrv_drained_end() is going to be called
* after we switched all nodes in the new AioContext, and the function
* assumes that the lock of the bs is always taken.
*/
if (qemu_get_aio_context() != ctx) {
aio_context_acquire(ctx);
}
tran_commit(tran);
if (qemu_get_aio_context() != ctx) {
aio_context_release(ctx);
}
/* Re-acquire the old AioContext, since the caller takes and releases it. */
if (qemu_get_aio_context() != old_context) {
aio_context_acquire(old_context);
}
return 0;
}
@ -8006,7 +7743,6 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
const char *node_name, Error **errp)
{
BlockDriverState *to_replace_bs = bdrv_find_node(node_name);
AioContext *aio_context;
GLOBAL_STATE_CODE();
@ -8015,12 +7751,8 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
return NULL;
}
aio_context = bdrv_get_aio_context(to_replace_bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) {
to_replace_bs = NULL;
goto out;
return NULL;
}
/* We don't want arbitrary node of the BDS chain to be replaced only the top
@ -8033,12 +7765,9 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
"because it cannot be guaranteed that doing so would not "
"lead to an abrupt change of visible data",
node_name, parent_bs->node_name);
to_replace_bs = NULL;
goto out;
return NULL;
}
out:
aio_context_release(aio_context);
return to_replace_bs;
}

4
block/backup.c
View File

@ -496,10 +496,10 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
block_copy_set_speed(bcs, speed);
/* Required permissions are taken by copy-before-write filter target */
bdrv_graph_wrlock(target);
bdrv_graph_wrlock();
block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL,
&error_abort);
bdrv_graph_wrunlock(target);
bdrv_graph_wrunlock();
return &job->common;

8
block/blklogwrites.c
View File

@ -251,9 +251,9 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
ret = 0;
fail_log:
if (ret < 0) {
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, s->log_file);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
s->log_file = NULL;
}
fail:
@ -265,10 +265,10 @@ static void blk_log_writes_close(BlockDriverState *bs)
{
BDRVBlkLogWritesState *s = bs->opaque;
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, s->log_file);
s->log_file = NULL;
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
}
static int64_t coroutine_fn GRAPH_RDLOCK

4
block/blkverify.c
View File

@ -151,10 +151,10 @@ static void blkverify_close(BlockDriverState *bs)
{
BDRVBlkverifyState *s = bs->opaque;
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, s->test_file);
s->test_file = NULL;
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
}
static int64_t coroutine_fn GRAPH_RDLOCK

33
block/block-backend.c
View File

@ -390,8 +390,6 @@ BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm)
* Both sets of permissions can be changed later using blk_set_perm().
*
* Return the new BlockBackend on success, null on failure.
*
* Callers must hold the AioContext lock of @bs.
*/
BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm,
uint64_t shared_perm, Error **errp)
@ -416,8 +414,6 @@ BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm,
* Just as with bdrv_open(), after having called this function the reference to
* @options belongs to the block layer (even on failure).
*
* Called without holding an AioContext lock.
*
* TODO: Remove @filename and @flags; it should be possible to specify a whole
* BDS tree just by specifying the @options QDict (or @reference,
* alternatively). At the time of adding this function, this is not possible,
@ -429,7 +425,6 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
{
BlockBackend *blk;
BlockDriverState *bs;
AioContext *ctx;
uint64_t perm = 0;
uint64_t shared = BLK_PERM_ALL;
@ -459,23 +454,18 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED;
}
aio_context_acquire(qemu_get_aio_context());
bs = bdrv_open(filename, reference, options, flags, errp);
aio_context_release(qemu_get_aio_context());
if (!bs) {
return NULL;
}
/* bdrv_open() could have moved bs to a different AioContext */
ctx = bdrv_get_aio_context(bs);
blk = blk_new(bdrv_get_aio_context(bs), perm, shared);
blk->perm = perm;
blk->shared_perm = shared;
aio_context_acquire(ctx);
blk_insert_bs(blk, bs, errp);
bdrv_unref(bs);
aio_context_release(ctx);
if (!blk->root) {
blk_unref(blk);
@ -577,13 +567,9 @@ void blk_remove_all_bs(void)
GLOBAL_STATE_CODE();
while ((blk = blk_all_next(blk)) != NULL) {
AioContext *ctx = blk_get_aio_context(blk);
aio_context_acquire(ctx);
if (blk->root) {
blk_remove_bs(blk);
}
aio_context_release(ctx);
}
}
@ -882,14 +868,11 @@ BlockBackend *blk_by_public(BlockBackendPublic *public)
/*
* Disassociates the currently associated BlockDriverState from @blk.
*
* The caller must hold the AioContext lock for the BlockBackend.
*/
void blk_remove_bs(BlockBackend *blk)
{
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
BdrvChild *root;
AioContext *ctx;
GLOBAL_STATE_CODE();
@ -919,30 +902,26 @@ void blk_remove_bs(BlockBackend *blk)
root = blk->root;
blk->root = NULL;
ctx = bdrv_get_aio_context(root->bs);
bdrv_graph_wrlock(root->bs);
bdrv_graph_wrlock();
bdrv_root_unref_child(root);
bdrv_graph_wrunlock_ctx(ctx);
bdrv_graph_wrunlock();
}
/*
* Associates a new BlockDriverState with @blk.
*
* Callers must hold the AioContext lock of @bs.
*/
int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
{
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
AioContext *ctx = bdrv_get_aio_context(bs);
GLOBAL_STATE_CODE();
bdrv_ref(bs);
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
blk->root = bdrv_root_attach_child(bs, "root", &child_root,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
blk->perm, blk->shared_perm,
blk, errp);
bdrv_graph_wrunlock_ctx(ctx);
bdrv_graph_wrunlock();
if (blk->root == NULL) {
return -EPERM;
}
@ -2739,20 +2718,16 @@ int blk_commit_all(void)
GRAPH_RDLOCK_GUARD_MAINLOOP();
while ((blk = blk_all_next(blk)) != NULL) {
AioContext *aio_context = blk_get_aio_context(blk);
BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk));
aio_context_acquire(aio_context);
if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) {
int ret;
ret = bdrv_commit(unfiltered_bs);
if (ret < 0) {
aio_context_release(aio_context);
return ret;
}
}
aio_context_release(aio_context);
}
return 0;
}

16
block/commit.c
View File

@ -100,9 +100,9 @@ static void commit_abort(Job *job)
bdrv_graph_rdunlock_main_loop();
bdrv_drained_begin(commit_top_backing_bs);
bdrv_graph_wrlock(commit_top_backing_bs);
bdrv_graph_wrlock();
bdrv_replace_node(s->commit_top_bs, commit_top_backing_bs, &error_abort);
bdrv_graph_wrunlock(commit_top_backing_bs);
bdrv_graph_wrunlock();
bdrv_drained_end(commit_top_backing_bs);
bdrv_unref(s->commit_top_bs);
@ -339,7 +339,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
* this is the responsibility of the interface (i.e. whoever calls
* commit_start()).
*/
bdrv_graph_wrlock(top);
bdrv_graph_wrlock();
s->base_overlay = bdrv_find_overlay(top, base);
assert(s->base_overlay);
@ -370,19 +370,19 @@ void commit_start(const char *job_id, BlockDriverState *bs,
ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
iter_shared_perms, errp);
if (ret < 0) {
bdrv_graph_wrunlock(top);
bdrv_graph_wrunlock();
goto fail;
}
}
if (bdrv_freeze_backing_chain(commit_top_bs, base, errp) < 0) {
bdrv_graph_wrunlock(top);
bdrv_graph_wrunlock();
goto fail;
}
s->chain_frozen = true;
ret = block_job_add_bdrv(&s->common, "base", base, 0, BLK_PERM_ALL, errp);
bdrv_graph_wrunlock(top);
bdrv_graph_wrunlock();
if (ret < 0) {
goto fail;
@ -434,9 +434,9 @@ fail:
* otherwise this would fail because of lack of permissions. */
if (commit_top_bs) {
bdrv_drained_begin(top);
bdrv_graph_wrlock(top);
bdrv_graph_wrlock();
bdrv_replace_node(commit_top_bs, top, &error_abort);
bdrv_graph_wrunlock(top);
bdrv_graph_wrunlock();
bdrv_drained_end(top);
}
}

22
block/copy-before-write.c
View File

@ -412,7 +412,6 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
int64_t cluster_size;
g_autoptr(BlockdevOptions) full_opts = NULL;
BlockdevOptionsCbw *opts;
AioContext *ctx;
int ret;
full_opts = cbw_parse_options(options, errp);
@ -435,15 +434,11 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
GRAPH_RDLOCK_GUARD_MAINLOOP();
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (opts->bitmap) {
bitmap = block_dirty_bitmap_lookup(opts->bitmap->node,
opts->bitmap->name, NULL, errp);
if (!bitmap) {
ret = -EINVAL;
goto out;
return -EINVAL;
}
}
s->on_cbw_error = opts->has_on_cbw_error ? opts->on_cbw_error :
@ -461,24 +456,21 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
s->bcs = block_copy_state_new(bs->file, s->target, bitmap, errp);
if (!s->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
ret = -EINVAL;
goto out;
return -EINVAL;
}
cluster_size = block_copy_cluster_size(s->bcs);
s->done_bitmap = bdrv_create_dirty_bitmap(bs, cluster_size, NULL, errp);
if (!s->done_bitmap) {
ret = -EINVAL;
goto out;
return -EINVAL;
}
bdrv_disable_dirty_bitmap(s->done_bitmap);
/* s->access_bitmap starts equal to bcs bitmap */
s->access_bitmap = bdrv_create_dirty_bitmap(bs, cluster_size, NULL, errp);
if (!s->access_bitmap) {
ret = -EINVAL;
goto out;
return -EINVAL;
}
bdrv_disable_dirty_bitmap(s->access_bitmap);
bdrv_dirty_bitmap_merge_internal(s->access_bitmap,
@ -487,11 +479,7 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
qemu_co_mutex_init(&s->lock);
QLIST_INIT(&s->frozen_read_reqs);
ret = 0;
out:
aio_context_release(ctx);
return ret;
return 0;
}
static void cbw_close(BlockDriverState *bs)

22
block/export/export.c
View File

@ -114,7 +114,6 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp)
}
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (export->iothread) {
IOThread *iothread;
@ -133,8 +132,6 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp)
set_context_errp = fixed_iothread ? errp : NULL;
ret = bdrv_try_change_aio_context(bs, new_ctx, NULL, set_context_errp);
if (ret == 0) {
aio_context_release(ctx);
aio_context_acquire(new_ctx);
ctx = new_ctx;
} else if (fixed_iothread) {
goto fail;
@ -191,8 +188,6 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp)
assert(exp->blk != NULL);
QLIST_INSERT_HEAD(&block_exports, exp, next);
aio_context_release(ctx);
return exp;
fail:
@ -200,7 +195,6 @@ fail:
blk_set_dev_ops(blk, NULL, NULL);
blk_unref(blk);
}
aio_context_release(ctx);
if (exp) {
g_free(exp->id);
g_free(exp);
@ -218,9 +212,6 @@ void blk_exp_ref(BlockExport *exp)
static void blk_exp_delete_bh(void *opaque)
{
BlockExport *exp = opaque;
AioContext *aio_context = exp->ctx;
aio_context_acquire(aio_context);
assert(exp->refcount == 0);
QLIST_REMOVE(exp, next);
@ -230,8 +221,6 @@ static void blk_exp_delete_bh(void *opaque)
qapi_event_send_block_export_deleted(exp->id);
g_free(exp->id);
g_free(exp);
aio_context_release(aio_context);
}
void blk_exp_unref(BlockExport *exp)
@ -249,22 +238,16 @@ void blk_exp_unref(BlockExport *exp)
* connections and other internally held references start to shut down. When
* the function returns, there may still be active references while the export
* is in the process of shutting down.
*
* Acquires exp->ctx internally. Callers must *not* hold the lock.
*/
void blk_exp_request_shutdown(BlockExport *exp)
{
AioContext *aio_context = exp->ctx;
aio_context_acquire(aio_context);
/*
* If the user doesn't own the export any more, it is already shutting
* down. We must not call .request_shutdown and decrease the refcount a
* second time.
*/
if (!exp->user_owned) {
goto out;
return;
}
exp->drv->request_shutdown(exp);
@ -272,9 +255,6 @@ void blk_exp_request_shutdown(BlockExport *exp)
assert(exp->user_owned);
exp->user_owned = false;
blk_exp_unref(exp);
out:
aio_context_release(aio_context);
}
/*

4
block/export/vhost-user-blk-server.c
View File

@ -278,7 +278,6 @@ static void vu_blk_exp_resize(void *opaque)
vu_config_change_msg(&vexp->vu_server.vu_dev);
}
/* Called with vexp->export.ctx acquired */
static void vu_blk_drained_begin(void *opaque)
{
VuBlkExport *vexp = opaque;
@ -287,7 +286,6 @@ static void vu_blk_drained_begin(void *opaque)
vhost_user_server_detach_aio_context(&vexp->vu_server);
}
/* Called with vexp->export.blk AioContext acquired */
static void vu_blk_drained_end(void *opaque)
{
VuBlkExport *vexp = opaque;
@ -300,8 +298,6 @@ static void vu_blk_drained_end(void *opaque)
* Ensures that bdrv_drained_begin() waits until in-flight requests complete
* and the server->co_trip coroutine has terminated. It will be restarted in
* vhost_user_server_attach_aio_context().
*
* Called with vexp->export.ctx acquired.
*/
static bool vu_blk_drained_poll(void *opaque)
{

103
block/file-posix.c
View File

@ -712,17 +712,11 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
#ifdef CONFIG_LINUX_AIO
/* Currently Linux does AIO only for files opened with O_DIRECT */
if (s->use_linux_aio) {
if (!(s->open_flags & O_DIRECT)) {
error_setg(errp, "aio=native was specified, but it requires "
"cache.direct=on, which was not specified.");
ret = -EINVAL;
goto fail;
}
if (!aio_setup_linux_aio(bdrv_get_aio_context(bs), errp)) {
error_prepend(errp, "Unable to use native AIO: ");
goto fail;
}
if (s->use_linux_aio && !(s->open_flags & O_DIRECT)) {
error_setg(errp, "aio=native was specified, but it requires "
"cache.direct=on, which was not specified.");
ret = -EINVAL;
goto fail;
}
#else
if (s->use_linux_aio) {
@ -733,14 +727,7 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
}
#endif /* !defined(CONFIG_LINUX_AIO) */
#ifdef CONFIG_LINUX_IO_URING
if (s->use_linux_io_uring) {
if (!aio_setup_linux_io_uring(bdrv_get_aio_context(bs), errp)) {
error_prepend(errp, "Unable to use io_uring: ");
goto fail;
}
}
#else
#ifndef CONFIG_LINUX_IO_URING
if (s->use_linux_io_uring) {
error_setg(errp, "aio=io_uring was specified, but is not supported "
"in this build.");
@ -2444,6 +2431,48 @@ static bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
return true;
}
#ifdef CONFIG_LINUX_IO_URING
static inline bool raw_check_linux_io_uring(BDRVRawState *s)
{
Error *local_err = NULL;
AioContext *ctx;
if (!s->use_linux_io_uring) {
return false;
}
ctx = qemu_get_current_aio_context();
if (unlikely(!aio_setup_linux_io_uring(ctx, &local_err))) {
error_reportf_err(local_err, "Unable to use linux io_uring, "
"falling back to thread pool: ");
s->use_linux_io_uring = false;
return false;
}
return true;
}
#endif
#ifdef CONFIG_LINUX_AIO
static inline bool raw_check_linux_aio(BDRVRawState *s)
{
Error *local_err = NULL;
AioContext *ctx;
if (!s->use_linux_aio) {
return false;
}
ctx = qemu_get_current_aio_context();
if (unlikely(!aio_setup_linux_aio(ctx, &local_err))) {
error_reportf_err(local_err, "Unable to use Linux AIO, "
"falling back to thread pool: ");
s->use_linux_aio = false;
return false;
}
return true;
}
#endif
static int coroutine_fn raw_co_prw(BlockDriverState *bs, int64_t *offset_ptr,
uint64_t bytes, QEMUIOVector *qiov, int type)
{
@ -2474,13 +2503,13 @@ static int coroutine_fn raw_co_prw(BlockDriverState *bs, int64_t *offset_ptr,
if (s->needs_alignment && !bdrv_qiov_is_aligned(bs, qiov)) {
type |= QEMU_AIO_MISALIGNED;
#ifdef CONFIG_LINUX_IO_URING
} else if (s->use_linux_io_uring) {
} else if (raw_check_linux_io_uring(s)) {
assert(qiov->size == bytes);
ret = luring_co_submit(bs, s->fd, offset, qiov, type);
goto out;
#endif
#ifdef CONFIG_LINUX_AIO
} else if (s->use_linux_aio) {
} else if (raw_check_linux_aio(s)) {
assert(qiov->size == bytes);
ret = laio_co_submit(s->fd, offset, qiov, type,
s->aio_max_batch);
@ -2567,39 +2596,13 @@ static int coroutine_fn raw_co_flush_to_disk(BlockDriverState *bs)
};
#ifdef CONFIG_LINUX_IO_URING
if (s->use_linux_io_uring) {
if (raw_check_linux_io_uring(s)) {
return luring_co_submit(bs, s->fd, 0, NULL, QEMU_AIO_FLUSH);
}
#endif
return raw_thread_pool_submit(handle_aiocb_flush, &acb);
}
static void raw_aio_attach_aio_context(BlockDriverState *bs,
AioContext *new_context)
{
BDRVRawState __attribute__((unused)) *s = bs->opaque;
#ifdef CONFIG_LINUX_AIO
if (s->use_linux_aio) {
Error *local_err = NULL;
if (!aio_setup_linux_aio(new_context, &local_err)) {
error_reportf_err(local_err, "Unable to use native AIO, "
"falling back to thread pool: ");
s->use_linux_aio = false;
}
}
#endif
#ifdef CONFIG_LINUX_IO_URING
if (s->use_linux_io_uring) {
Error *local_err = NULL;
if (!aio_setup_linux_io_uring(new_context, &local_err)) {
error_reportf_err(local_err, "Unable to use linux io_uring, "
"falling back to thread pool: ");
s->use_linux_io_uring = false;
}
}
#endif
}
static void raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
@ -3896,7 +3899,6 @@ BlockDriver bdrv_file = {
.bdrv_co_copy_range_from = raw_co_copy_range_from,
.bdrv_co_copy_range_to = raw_co_copy_range_to,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
.bdrv_co_truncate = raw_co_truncate,
.bdrv_co_getlength = raw_co_getlength,
@ -4266,7 +4268,6 @@ static BlockDriver bdrv_host_device = {
.bdrv_co_copy_range_from = raw_co_copy_range_from,
.bdrv_co_copy_range_to = raw_co_copy_range_to,
.bdrv_refresh_limits = raw_refresh_limits,
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
.bdrv_co_truncate = raw_co_truncate,
.bdrv_co_getlength = raw_co_getlength,
@ -4402,7 +4403,6 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_co_pwritev = raw_co_pwritev,
.bdrv_co_flush_to_disk = raw_co_flush_to_disk,
.bdrv_refresh_limits = cdrom_refresh_limits,
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
.bdrv_co_truncate = raw_co_truncate,
.bdrv_co_getlength = raw_co_getlength,
@ -4528,7 +4528,6 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_co_pwritev = raw_co_pwritev,
.bdrv_co_flush_to_disk = raw_co_flush_to_disk,
.bdrv_refresh_limits = cdrom_refresh_limits,
.bdrv_attach_aio_context = raw_aio_attach_aio_context,
.bdrv_co_truncate = raw_co_truncate,
.bdrv_co_getlength = raw_co_getlength,

44
block/graph-lock.c
View File

@ -106,27 +106,12 @@ static uint32_t reader_count(void)
return rd;
}
void no_coroutine_fn bdrv_graph_wrlock(BlockDriverState *bs)
void no_coroutine_fn bdrv_graph_wrlock(void)
{
AioContext *ctx = NULL;
GLOBAL_STATE_CODE();
assert(!qatomic_read(&has_writer));
assert(!qemu_in_coroutine());
/*
* Release only non-mainloop AioContext. The mainloop often relies on the
* BQL and doesn't lock the main AioContext before doing things.
*/
if (bs) {
ctx = bdrv_get_aio_context(bs);
if (ctx != qemu_get_aio_context()) {
aio_context_release(ctx);
} else {
ctx = NULL;
}
}
/* Make sure that constantly arriving new I/O doesn't cause starvation */
bdrv_drain_all_begin_nopoll();
@ -155,27 +140,13 @@ void no_coroutine_fn bdrv_graph_wrlock(BlockDriverState *bs)
} while (reader_count() >= 1);
bdrv_drain_all_end();
if (ctx) {
aio_context_acquire(bdrv_get_aio_context(bs));
}
}
void no_coroutine_fn bdrv_graph_wrunlock_ctx(AioContext *ctx)
void no_coroutine_fn bdrv_graph_wrunlock(void)
{
GLOBAL_STATE_CODE();
assert(qatomic_read(&has_writer));
/*
* Release only non-mainloop AioContext. The mainloop often relies on the
* BQL and doesn't lock the main AioContext before doing things.
*/
if (ctx && ctx != qemu_get_aio_context()) {
aio_context_release(ctx);
} else {
ctx = NULL;
}
WITH_QEMU_LOCK_GUARD(&aio_context_list_lock) {
/*
* No need for memory barriers, this works in pair with
@ -197,17 +168,6 @@ void no_coroutine_fn bdrv_graph_wrunlock_ctx(AioContext *ctx)
* progress.
*/
aio_bh_poll(qemu_get_aio_context());
if (ctx) {
aio_context_acquire(ctx);
}
}
void no_coroutine_fn bdrv_graph_wrunlock(BlockDriverState *bs)
{
AioContext *ctx = bs ? bdrv_get_aio_context(bs) : NULL;
bdrv_graph_wrunlock_ctx(ctx);
}
void coroutine_fn bdrv_graph_co_rdlock(void)

45
block/io.c
View File

@ -294,8 +294,6 @@ static void bdrv_co_drain_bh_cb(void *opaque)
BlockDriverState *bs = data->bs;
if (bs) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_dec_in_flight(bs);
if (data->begin) {
bdrv_do_drained_begin(bs, data->parent, data->poll);
@ -303,7 +301,6 @@ static void bdrv_co_drain_bh_cb(void *opaque)
assert(!data->poll);
bdrv_do_drained_end(bs, data->parent);
}
aio_context_release(ctx);
} else {
assert(data->begin);
bdrv_drain_all_begin();
@ -320,8 +317,6 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs,
{
BdrvCoDrainData data;
Coroutine *self = qemu_coroutine_self();
AioContext *ctx = bdrv_get_aio_context(bs);
AioContext *co_ctx = qemu_coroutine_get_aio_context(self);
/* Calling bdrv_drain() from a BH ensures the current coroutine yields and
* other coroutines run if they were queued by aio_co_enter(). */
@ -340,17 +335,6 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs,
bdrv_inc_in_flight(bs);
}
/*
* Temporarily drop the lock across yield or we would get deadlocks.
* bdrv_co_drain_bh_cb() reaquires the lock as needed.
*
* When we yield below, the lock for the current context will be
* released, so if this is actually the lock that protects bs, don't drop
* it a second time.
*/
if (ctx != co_ctx) {
aio_context_release(ctx);
}
replay_bh_schedule_oneshot_event(qemu_get_aio_context(),
bdrv_co_drain_bh_cb, &data);
@ -358,11 +342,6 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs,
/* If we are resumed from some other event (such as an aio completion or a
* timer callback), it is a bug in the caller that should be fixed. */
assert(data.done);
/* Reacquire the AioContext of bs if we dropped it */
if (ctx != co_ctx) {
aio_context_acquire(ctx);
}
}
static void bdrv_do_drained_begin(BlockDriverState *bs, BdrvChild *parent,
@ -478,13 +457,12 @@ static bool bdrv_drain_all_poll(void)
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
/* bdrv_drain_poll() can't make changes to the graph and we are holding the
* main AioContext lock, so iterating bdrv_next_all_states() is safe. */
/*
* bdrv_drain_poll() can't make changes to the graph and we hold the BQL,
* so iterating bdrv_next_all_states() is safe.
*/
while ((bs = bdrv_next_all_states(bs))) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
result |= bdrv_drain_poll(bs, NULL, true);
aio_context_release(aio_context);
}
return result;
@ -525,11 +503,7 @@ void bdrv_drain_all_begin_nopoll(void)
/* Quiesce all nodes, without polling in-flight requests yet. The graph
* cannot change during this loop. */
while ((bs = bdrv_next_all_states(bs))) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_do_drained_begin(bs, NULL, false);
aio_context_release(aio_context);
}
}
@ -588,11 +562,7 @@ void bdrv_drain_all_end(void)
}
while ((bs = bdrv_next_all_states(bs))) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_do_drained_end(bs, NULL);
aio_context_release(aio_context);
}
assert(qemu_get_current_aio_context() == qemu_get_aio_context());
@ -2368,15 +2338,10 @@ int bdrv_flush_all(void)
}
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
AioContext *aio_context = bdrv_get_aio_context(bs);
int ret;
aio_context_acquire(aio_context);
ret = bdrv_flush(bs);
int ret = bdrv_flush(bs);
if (ret < 0 && !result) {
result = ret;
}
aio_context_release(aio_context);
}
return result;

41
block/mirror.c
View File

@ -662,7 +662,6 @@ static int mirror_exit_common(Job *job)
MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
BlockJob *bjob = &s->common;
MirrorBDSOpaque *bs_opaque;
AioContext *replace_aio_context = NULL;
BlockDriverState *src;
BlockDriverState *target_bs;
BlockDriverState *mirror_top_bs;
@ -677,7 +676,6 @@ static int mirror_exit_common(Job *job)
}
s->prepared = true;
aio_context_acquire(qemu_get_aio_context());
bdrv_graph_rdlock_main_loop();
mirror_top_bs = s->mirror_top_bs;
@ -742,11 +740,6 @@ static int mirror_exit_common(Job *job)
}
bdrv_graph_rdunlock_main_loop();
if (s->to_replace) {
replace_aio_context = bdrv_get_aio_context(s->to_replace);
aio_context_acquire(replace_aio_context);
}
if (s->should_complete && !abort) {
BlockDriverState *to_replace = s->to_replace ?: src;
bool ro = bdrv_is_read_only(to_replace);
@ -764,7 +757,7 @@ static int mirror_exit_common(Job *job)
* check for an op blocker on @to_replace, and we have our own
* there.
*/
bdrv_graph_wrlock(target_bs);
bdrv_graph_wrlock();
if (bdrv_recurse_can_replace(src, to_replace)) {
bdrv_replace_node(to_replace, target_bs, &local_err);
} else {
@ -773,7 +766,7 @@ static int mirror_exit_common(Job *job)
"would not lead to an abrupt change of visible data",
to_replace->node_name, target_bs->node_name);
}
bdrv_graph_wrunlock(target_bs);
bdrv_graph_wrunlock();
bdrv_drained_end(to_replace);
if (local_err) {
error_report_err(local_err);
@ -785,9 +778,6 @@ static int mirror_exit_common(Job *job)
error_free(s->replace_blocker);
bdrv_unref(s->to_replace);
}
if (replace_aio_context) {
aio_context_release(replace_aio_context);
}
g_free(s->replaces);
/*
@ -796,9 +786,9 @@ static int mirror_exit_common(Job *job)
* valid.
*/
block_job_remove_all_bdrv(bjob);
bdrv_graph_wrlock(mirror_top_bs);
bdrv_graph_wrlock();
bdrv_replace_node(mirror_top_bs, mirror_top_bs->backing->bs, &error_abort);
bdrv_graph_wrunlock(mirror_top_bs);
bdrv_graph_wrunlock();
bdrv_drained_end(target_bs);
bdrv_unref(target_bs);
@ -811,8 +801,6 @@ static int mirror_exit_common(Job *job)
bdrv_unref(mirror_top_bs);
bdrv_unref(src);
aio_context_release(qemu_get_aio_context());
return ret;
}
@ -1191,24 +1179,17 @@ static void mirror_complete(Job *job, Error **errp)
/* block all operations on to_replace bs */
if (s->replaces) {
AioContext *replace_aio_context;
s->to_replace = bdrv_find_node(s->replaces);
if (!s->to_replace) {
error_setg(errp, "Node name '%s' not found", s->replaces);
return;
}
replace_aio_context = bdrv_get_aio_context(s->to_replace);
aio_context_acquire(replace_aio_context);
/* TODO Translate this into child freeze system. */
error_setg(&s->replace_blocker,
"block device is in use by block-job-complete");
bdrv_op_block_all(s->to_replace, s->replace_blocker);
bdrv_ref(s->to_replace);
aio_context_release(replace_aio_context);
}
s->should_complete = true;
@ -1914,13 +1895,13 @@ static BlockJob *mirror_start_job(
*/
bdrv_disable_dirty_bitmap(s->dirty_bitmap);
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
ret = block_job_add_bdrv(&s->common, "source", bs, 0,
BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE |
BLK_PERM_CONSISTENT_READ,
errp);
if (ret < 0) {
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
goto fail;
}
@ -1965,17 +1946,17 @@ static BlockJob *mirror_start_job(
ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
iter_shared_perms, errp);
if (ret < 0) {
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
goto fail;
}
}
if (bdrv_freeze_backing_chain(mirror_top_bs, target, errp) < 0) {
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
goto fail;
}
}
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
QTAILQ_INIT(&s->ops_in_flight);
@ -2001,12 +1982,12 @@ fail:
bs_opaque->stop = true;
bdrv_drained_begin(bs);
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
assert(mirror_top_bs->backing->bs == bs);
bdrv_child_refresh_perms(mirror_top_bs, mirror_top_bs->backing,
&error_abort);
bdrv_replace_node(mirror_top_bs, bs, &error_abort);
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
bdrv_drained_end(bs);
bdrv_unref(mirror_top_bs);

20
block/monitor/bitmap-qmp-cmds.c
View File

@ -95,7 +95,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
AioContext *aio_context;
if (!name || name[0] == '\0') {
error_setg(errp, "Bitmap name cannot be empty");
@ -107,14 +106,11 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (has_granularity) {
if (granularity < 512 || !is_power_of_2(granularity)) {
error_setg(errp, "Granularity must be power of 2 "
"and at least 512");
goto out;
return;
}
} else {
/* Default to cluster size, if available: */
@ -132,12 +128,12 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
if (persistent &&
!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
{
goto out;
return;
}
bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
if (bitmap == NULL) {
goto out;
return;
}
if (disabled) {
@ -145,9 +141,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
}
bdrv_dirty_bitmap_set_persistence(bitmap, persistent);
out:
aio_context_release(aio_context);
}
BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
@ -157,7 +150,6 @@ BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
AioContext *aio_context;
GLOBAL_STATE_CODE();
@ -166,19 +158,14 @@ BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO,
errp)) {
aio_context_release(aio_context);
return NULL;
}
if (bdrv_dirty_bitmap_get_persistence(bitmap) &&
bdrv_remove_persistent_dirty_bitmap(bs, name, errp) < 0)
{
aio_context_release(aio_context);
return NULL;
}
@ -190,7 +177,6 @@ BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
*bitmap_bs = bs;
}
aio_context_release(aio_context);
return release ? NULL : bitmap;
}

29
block/monitor/block-hmp-cmds.c
View File

@ -141,7 +141,6 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
const char *id = qdict_get_str(qdict, "id");
BlockBackend *blk;
BlockDriverState *bs;
AioContext *aio_context;
Error *local_err = NULL;
GLOBAL_STATE_CODE();
@ -168,14 +167,10 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
return;
}
aio_context = blk_get_aio_context(blk);
aio_context_acquire(aio_context);
bs = blk_bs(blk);
if (bs) {
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
error_report_err(local_err);
aio_context_release(aio_context);
return;
}
@ -196,8 +191,6 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
} else {
blk_unref(blk);
}
aio_context_release(aio_context);
}
void hmp_commit(Monitor *mon, const QDict *qdict)
@ -213,7 +206,6 @@ void hmp_commit(Monitor *mon, const QDict *qdict)
ret = blk_commit_all();
} else {
BlockDriverState *bs;
AioContext *aio_context;
blk = blk_by_name(device);
if (!blk) {
@ -222,18 +214,13 @@ void hmp_commit(Monitor *mon, const QDict *qdict)
}
bs = bdrv_skip_implicit_filters(blk_bs(blk));
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!blk_is_available(blk)) {
error_report("Device '%s' has no medium", device);
aio_context_release(aio_context);
return;
}
ret = bdrv_commit(bs);
aio_context_release(aio_context);
}
if (ret < 0) {
error_report("'commit' error for '%s': %s", device, strerror(-ret));
@ -560,7 +547,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
BlockBackend *blk = NULL;
BlockDriverState *bs = NULL;
BlockBackend *local_blk = NULL;
AioContext *ctx = NULL;
bool qdev = qdict_get_try_bool(qdict, "qdev", false);
const char *device = qdict_get_str(qdict, "device");
const char *command = qdict_get_str(qdict, "command");
@ -582,9 +568,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
}
}
ctx = blk ? blk_get_aio_context(blk) : bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (bs) {
blk = local_blk = blk_new(bdrv_get_aio_context(bs), 0, BLK_PERM_ALL);
ret = blk_insert_bs(blk, bs, &err);
@ -622,11 +605,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
fail:
blk_unref(local_blk);
if (ctx) {
aio_context_release(ctx);
}
hmp_handle_error(mon, err);
}
@ -882,7 +860,6 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
int nb_sns, i;
int total;
int *global_snapshots;
AioContext *aio_context;
typedef struct SnapshotEntry {
QEMUSnapshotInfo sn;
@ -909,11 +886,8 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
error_report_err(err);
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
nb_sns = bdrv_snapshot_list(bs, &sn_tab);
aio_context_release(aio_context);
if (nb_sns < 0) {
monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
@ -924,9 +898,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
int bs1_nb_sns = 0;
ImageEntry *ie;
SnapshotEntry *se;
AioContext *ctx = bdrv_get_aio_context(bs1);
aio_context_acquire(ctx);
if (bdrv_can_snapshot(bs1)) {
sn = NULL;
bs1_nb_sns = bdrv_snapshot_list(bs1, &sn);
@ -944,7 +916,6 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
}
g_free(sn);
}
aio_context_release(ctx);
}
if (no_snapshot) {

27
block/qapi-sysemu.c
View File

@ -174,7 +174,6 @@ blockdev_remove_medium(const char *device, const char *id, Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
AioContext *aio_context;
bool has_attached_device;
GLOBAL_STATE_CODE();
@ -204,13 +203,10 @@ blockdev_remove_medium(const char *device, const char *id, Error **errp)
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_graph_rdlock_main_loop();
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
bdrv_graph_rdunlock_main_loop();
goto out;
return;
}
bdrv_graph_rdunlock_main_loop();
@ -223,9 +219,6 @@ blockdev_remove_medium(const char *device, const char *id, Error **errp)
* value passed here (i.e. false). */
blk_dev_change_media_cb(blk, false, &error_abort);
}
out:
aio_context_release(aio_context);
}
void qmp_blockdev_remove_medium(const char *id, Error **errp)
@ -237,7 +230,6 @@ static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
BlockDriverState *bs, Error **errp)
{
Error *local_err = NULL;
AioContext *ctx;
bool has_device;
int ret;
@ -259,11 +251,7 @@ static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
return;
}
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
ret = blk_insert_bs(blk, bs, errp);
aio_context_release(ctx);
if (ret < 0) {
return;
}
@ -374,9 +362,7 @@ void qmp_blockdev_change_medium(const char *device,
qdict_put_str(options, "driver", format);
}
aio_context_acquire(qemu_get_aio_context());
medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
aio_context_release(qemu_get_aio_context());
if (!medium_bs) {
goto fail;
@ -437,20 +423,16 @@ void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
ThrottleConfig cfg;
BlockDriverState *bs;
BlockBackend *blk;
AioContext *aio_context;
blk = qmp_get_blk(arg->device, arg->id, errp);
if (!blk) {
return;
}
aio_context = blk_get_aio_context(blk);
aio_context_acquire(aio_context);
bs = blk_bs(blk);
if (!bs) {
error_setg(errp, "Device has no medium");
goto out;
return;
}
throttle_config_init(&cfg);
@ -505,7 +487,7 @@ void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
}
if (!throttle_is_valid(&cfg, errp)) {
goto out;
return;
}
if (throttle_enabled(&cfg)) {
@ -522,9 +504,6 @@ void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
/* If all throttling settings are set to 0, disable I/O limits */
blk_io_limits_disable(blk);
}
out:
aio_context_release(aio_context);
}
void qmp_block_latency_histogram_set(

18
block/qapi.c
View File

@ -234,13 +234,11 @@ bdrv_do_query_node_info(BlockDriverState *bs, BlockNodeInfo *info, Error **errp)
int ret;
Error *err = NULL;
aio_context_acquire(bdrv_get_aio_context(bs));
size = bdrv_getlength(bs);
if (size < 0) {
error_setg_errno(errp, -size, "Can't get image size '%s'",
bs->exact_filename);
goto out;
return;
}
bdrv_refresh_filename(bs);
@ -265,7 +263,7 @@ bdrv_do_query_node_info(BlockDriverState *bs, BlockNodeInfo *info, Error **errp)
info->format_specific = bdrv_get_specific_info(bs, &err);
if (err) {
error_propagate(errp, err);
goto out;
return;
}
backing_filename = bs->backing_file;
if (backing_filename[0] != '\0') {
@ -300,11 +298,8 @@ bdrv_do_query_node_info(BlockDriverState *bs, BlockNodeInfo *info, Error **errp)
break;
default:
error_propagate(errp, err);
goto out;
return;
}
out:
aio_context_release(bdrv_get_aio_context(bs));
}
/**
@ -709,15 +704,10 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
/* Just to be safe if query_nodes is not always initialized */
if (has_query_nodes && query_nodes) {
for (bs = bdrv_next_node(NULL); bs; bs = bdrv_next_node(bs)) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
QAPI_LIST_APPEND(tail, bdrv_query_bds_stats(bs, false));
aio_context_release(ctx);
}
} else {
for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
AioContext *ctx = blk_get_aio_context(blk);
BlockStats *s;
char *qdev;
@ -725,7 +715,6 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
continue;
}
aio_context_acquire(ctx);
s = bdrv_query_bds_stats(blk_bs(blk), true);
s->device = g_strdup(blk_name(blk));
@ -737,7 +726,6 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
}
bdrv_query_blk_stats(s->stats, blk);
aio_context_release(ctx);
QAPI_LIST_APPEND(tail, s);
}

4
block/qcow2.c
View File

@ -2807,9 +2807,9 @@ qcow2_do_close(BlockDriverState *bs, bool close_data_file)
if (close_data_file && has_data_file(bs)) {
GLOBAL_STATE_CODE();
bdrv_graph_rdunlock_main_loop();
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, s->data_file);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
s->data_file = NULL;
bdrv_graph_rdlock_main_loop();
}

8
block/quorum.c
View File

@ -1037,14 +1037,14 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags,
close_exit:
/* cleanup on error */
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
for (i = 0; i < s->num_children; i++) {
if (!opened[i]) {
continue;
}
bdrv_unref_child(bs, s->children[i]);
}
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
g_free(s->children);
g_free(opened);
exit:
@ -1057,11 +1057,11 @@ static void quorum_close(BlockDriverState *bs)
BDRVQuorumState *s = bs->opaque;
int i;
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
for (i = 0; i < s->num_children; i++) {
bdrv_unref_child(bs, s->children[i]);
}
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
g_free(s->children);
}

5
block/raw-format.c
View File

@ -470,7 +470,6 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVRawState *s = bs->opaque;
AioContext *ctx;
bool has_size;
uint64_t offset, size;
BdrvChildRole file_role;
@ -522,11 +521,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
bs->file->bs->filename);
}
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
ret = raw_apply_options(bs, s, offset, has_size, size, errp);
aio_context_release(ctx);
if (ret < 0) {
return ret;
}

72
block/replication.c
View File

@ -394,14 +394,7 @@ static void reopen_backing_file(BlockDriverState *bs, bool writable,
}
if (reopen_queue) {
AioContext *ctx = bdrv_get_aio_context(bs);
if (ctx != qemu_get_aio_context()) {
aio_context_release(ctx);
}
bdrv_reopen_multiple(reopen_queue, errp);
if (ctx != qemu_get_aio_context()) {
aio_context_acquire(ctx);
}
}
}
@ -462,14 +455,11 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
BlockDriverState *top_bs;
BdrvChild *active_disk, *hidden_disk, *secondary_disk;
int64_t active_length, hidden_length, disk_length;
AioContext *aio_context;
Error *local_err = NULL;
BackupPerf perf = { .use_copy_range = true, .max_workers = 1 };
GLOBAL_STATE_CODE();
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
s = bs->opaque;
if (s->stage == BLOCK_REPLICATION_DONE ||
@ -479,20 +469,17 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
* Ignore the request because the secondary side of replication
* doesn't have to do anything anymore.
*/
aio_context_release(aio_context);
return;
}
if (s->stage != BLOCK_REPLICATION_NONE) {
error_setg(errp, "Block replication is running or done");
aio_context_release(aio_context);
return;
}
if (s->mode != mode) {
error_setg(errp, "The parameter mode's value is invalid, needs %d,"
" but got %d", s->mode, mode);
aio_context_release(aio_context);
return;
}
@ -505,7 +492,6 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
if (!active_disk || !active_disk->bs || !active_disk->bs->backing) {
error_setg(errp, "Active disk doesn't have backing file");
bdrv_graph_rdunlock_main_loop();
aio_context_release(aio_context);
return;
}
@ -513,7 +499,6 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
if (!hidden_disk->bs || !hidden_disk->bs->backing) {
error_setg(errp, "Hidden disk doesn't have backing file");
bdrv_graph_rdunlock_main_loop();
aio_context_release(aio_context);
return;
}
@ -521,7 +506,6 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
if (!secondary_disk->bs || !bdrv_has_blk(secondary_disk->bs)) {
error_setg(errp, "The secondary disk doesn't have block backend");
bdrv_graph_rdunlock_main_loop();
aio_context_release(aio_context);
return;
}
bdrv_graph_rdunlock_main_loop();
@ -534,7 +518,6 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
active_length != hidden_length || hidden_length != disk_length) {
error_setg(errp, "Active disk, hidden disk, secondary disk's length"
" are not the same");
aio_context_release(aio_context);
return;
}
@ -546,7 +529,6 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
!hidden_disk->bs->drv->bdrv_make_empty) {
error_setg(errp,
"Active disk or hidden disk doesn't support make_empty");
aio_context_release(aio_context);
bdrv_graph_rdunlock_main_loop();
return;
}
@ -556,11 +538,10 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
reopen_backing_file(bs, true, &local_err);
if (local_err) {
error_propagate(errp, local_err);
aio_context_release(aio_context);
return;
}
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
bdrv_ref(hidden_disk->bs);
s->hidden_disk = bdrv_attach_child(bs, hidden_disk->bs, "hidden disk",
@ -568,8 +549,7 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
bdrv_graph_wrunlock(bs);
aio_context_release(aio_context);
bdrv_graph_wrunlock();
return;
}
@ -579,8 +559,7 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
BDRV_CHILD_DATA, &local_err);
if (local_err) {
error_propagate(errp, local_err);
bdrv_graph_wrunlock(bs);
aio_context_release(aio_context);
bdrv_graph_wrunlock();
return;
}
@ -592,15 +571,14 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
if (!top_bs || !bdrv_is_root_node(top_bs) ||
!check_top_bs(top_bs, bs)) {
error_setg(errp, "No top_bs or it is invalid");
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
reopen_backing_file(bs, false, NULL);
aio_context_release(aio_context);
return;
}
bdrv_op_block_all(top_bs, s->blocker);
bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker);
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
s->backup_job = backup_job_create(
NULL, s->secondary_disk->bs, s->hidden_disk->bs,
@ -612,13 +590,11 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
if (local_err) {
error_propagate(errp, local_err);
backup_job_cleanup(bs);
aio_context_release(aio_context);
return;
}
job_start(&s->backup_job->job);
break;
default:
aio_context_release(aio_context);
abort();
}
@ -629,18 +605,12 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
}
s->error = 0;
aio_context_release(aio_context);
}
static void replication_do_checkpoint(ReplicationState *rs, Error **errp)
{
BlockDriverState *bs = rs->opaque;
BDRVReplicationState *s;
AioContext *aio_context;
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
s = bs->opaque;
BDRVReplicationState *s = bs->opaque;
if (s->stage == BLOCK_REPLICATION_DONE ||
s->stage == BLOCK_REPLICATION_FAILOVER) {
@ -649,38 +619,28 @@ static void replication_do_checkpoint(ReplicationState *rs, Error **errp)
* Ignore the request because the secondary side of replication
* doesn't have to do anything anymore.
*/
aio_context_release(aio_context);
return;
}
if (s->mode == REPLICATION_MODE_SECONDARY) {
secondary_do_checkpoint(bs, errp);
}
aio_context_release(aio_context);
}
static void replication_get_error(ReplicationState *rs, Error **errp)
{
BlockDriverState *bs = rs->opaque;
BDRVReplicationState *s;
AioContext *aio_context;
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
s = bs->opaque;
BDRVReplicationState *s = bs->opaque;
if (s->stage == BLOCK_REPLICATION_NONE) {
error_setg(errp, "Block replication is not running");
aio_context_release(aio_context);
return;
}
if (s->error) {
error_setg(errp, "I/O error occurred");
aio_context_release(aio_context);
return;
}
aio_context_release(aio_context);
}
static void replication_done(void *opaque, int ret)
@ -691,12 +651,12 @@ static void replication_done(void *opaque, int ret)
if (ret == 0) {
s->stage = BLOCK_REPLICATION_DONE;
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, s->secondary_disk);
s->secondary_disk = NULL;
bdrv_unref_child(bs, s->hidden_disk);
s->hidden_disk = NULL;
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
s->error = 0;
} else {
@ -708,12 +668,7 @@ static void replication_done(void *opaque, int ret)
static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
{
BlockDriverState *bs = rs->opaque;
BDRVReplicationState *s;
AioContext *aio_context;
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
s = bs->opaque;
BDRVReplicationState *s = bs->opaque;
if (s->stage == BLOCK_REPLICATION_DONE ||
s->stage == BLOCK_REPLICATION_FAILOVER) {
@ -722,13 +677,11 @@ static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
* Ignore the request because the secondary side of replication
* doesn't have to do anything anymore.
*/
aio_context_release(aio_context);
return;
}
if (s->stage != BLOCK_REPLICATION_RUNNING) {
error_setg(errp, "Block replication is not running");
aio_context_release(aio_context);
return;
}
@ -744,15 +697,12 @@ static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
* disk, secondary disk in backup_job_completed().
*/
if (s->backup_job) {
aio_context_release(aio_context);
job_cancel_sync(&s->backup_job->job, true);
aio_context_acquire(aio_context);
}
if (!failover) {
secondary_do_checkpoint(bs, errp);
s->stage = BLOCK_REPLICATION_DONE;
aio_context_release(aio_context);
return;
}
@ -765,10 +715,8 @@ static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
bdrv_graph_rdunlock_main_loop();
break;
default:
aio_context_release(aio_context);
abort();
}
aio_context_release(aio_context);
}
static const char *const replication_strong_runtime_opts[] = {

30
block/snapshot.c
View File

@ -196,8 +196,10 @@ bdrv_snapshot_fallback(BlockDriverState *bs)
int bdrv_can_snapshot(BlockDriverState *bs)
{
BlockDriver *drv = bs->drv;
GLOBAL_STATE_CODE();
if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
if (!drv || !bdrv_is_inserted(bs) || !bdrv_is_writable(bs)) {
return 0;
}
@ -290,9 +292,9 @@ int bdrv_snapshot_goto(BlockDriverState *bs,
}
/* .bdrv_open() will re-attach it */
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, fallback);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
ret = bdrv_snapshot_goto(fallback_bs, snapshot_id, errp);
open_ret = drv->bdrv_open(bs, options, bs->open_flags, &local_err);
@ -525,9 +527,7 @@ static bool GRAPH_RDLOCK bdrv_all_snapshots_includes_bs(BlockDriverState *bs)
return bdrv_has_blk(bs) || QLIST_EMPTY(&bs->parents);
}
/* Group operations. All block drivers are involved.
* These functions will properly handle dataplane (take aio_context_acquire
* when appropriate for appropriate block drivers) */
/* Group operations. All block drivers are involved. */
bool bdrv_all_can_snapshot(bool has_devices, strList *devices,
Error **errp)
@ -545,14 +545,11 @@ bool bdrv_all_can_snapshot(bool has_devices, strList *devices,
iterbdrvs = bdrvs;
while (iterbdrvs) {
BlockDriverState *bs = iterbdrvs->data;
AioContext *ctx = bdrv_get_aio_context(bs);
bool ok = true;
aio_context_acquire(ctx);
if (devices || bdrv_all_snapshots_includes_bs(bs)) {
ok = bdrv_can_snapshot(bs);
}
aio_context_release(ctx);
if (!ok) {
error_setg(errp, "Device '%s' is writable but does not support "
"snapshots", bdrv_get_device_or_node_name(bs));
@ -582,18 +579,15 @@ int bdrv_all_delete_snapshot(const char *name,
iterbdrvs = bdrvs;
while (iterbdrvs) {
BlockDriverState *bs = iterbdrvs->data;
AioContext *ctx = bdrv_get_aio_context(bs);
QEMUSnapshotInfo sn1, *snapshot = &sn1;
int ret = 0;
aio_context_acquire(ctx);
if ((devices || bdrv_all_snapshots_includes_bs(bs)) &&
bdrv_snapshot_find(bs, snapshot, name) >= 0)
{
ret = bdrv_snapshot_delete(bs, snapshot->id_str,
snapshot->name, errp);
}
aio_context_release(ctx);
if (ret < 0) {
error_prepend(errp, "Could not delete snapshot '%s' on '%s': ",
name, bdrv_get_device_or_node_name(bs));
@ -628,17 +622,14 @@ int bdrv_all_goto_snapshot(const char *name,
iterbdrvs = bdrvs;
while (iterbdrvs) {
BlockDriverState *bs = iterbdrvs->data;
AioContext *ctx = bdrv_get_aio_context(bs);
bool all_snapshots_includes_bs;
aio_context_acquire(ctx);
bdrv_graph_rdlock_main_loop();
all_snapshots_includes_bs = bdrv_all_snapshots_includes_bs(bs);
bdrv_graph_rdunlock_main_loop();
ret = (devices || all_snapshots_includes_bs) ?
bdrv_snapshot_goto(bs, name, errp) : 0;
aio_context_release(ctx);
if (ret < 0) {
bdrv_graph_rdlock_main_loop();
error_prepend(errp, "Could not load snapshot '%s' on '%s': ",
@ -670,15 +661,12 @@ int bdrv_all_has_snapshot(const char *name,
iterbdrvs = bdrvs;
while (iterbdrvs) {
BlockDriverState *bs = iterbdrvs->data;
AioContext *ctx = bdrv_get_aio_context(bs);
QEMUSnapshotInfo sn;
int ret = 0;
aio_context_acquire(ctx);
if (devices || bdrv_all_snapshots_includes_bs(bs)) {
ret = bdrv_snapshot_find(bs, &sn, name);
}
aio_context_release(ctx);
if (ret < 0) {
if (ret == -ENOENT) {
return 0;
@ -715,10 +703,8 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
iterbdrvs = bdrvs;
while (iterbdrvs) {
BlockDriverState *bs = iterbdrvs->data;
AioContext *ctx = bdrv_get_aio_context(bs);
int ret = 0;
aio_context_acquire(ctx);
if (bs == vm_state_bs) {
sn->vm_state_size = vm_state_size;
ret = bdrv_snapshot_create(bs, sn);
@ -726,7 +712,6 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
sn->vm_state_size = 0;
ret = bdrv_snapshot_create(bs, sn);
}
aio_context_release(ctx);
if (ret < 0) {
error_setg(errp, "Could not create snapshot '%s' on '%s'",
sn->name, bdrv_get_device_or_node_name(bs));
@ -757,13 +742,10 @@ BlockDriverState *bdrv_all_find_vmstate_bs(const char *vmstate_bs,
iterbdrvs = bdrvs;
while (iterbdrvs) {
BlockDriverState *bs = iterbdrvs->data;
AioContext *ctx = bdrv_get_aio_context(bs);
bool found = false;
aio_context_acquire(ctx);
found = (devices || bdrv_all_snapshots_includes_bs(bs)) &&
bdrv_can_snapshot(bs);
aio_context_release(ctx);
if (vmstate_bs) {
if (g_str_equal(vmstate_bs,

12
block/stream.c
View File

@ -99,9 +99,9 @@ static int stream_prepare(Job *job)
}
}
bdrv_graph_wrlock(s->target_bs);
bdrv_graph_wrlock();
bdrv_set_backing_hd_drained(unfiltered_bs, base, &local_err);
bdrv_graph_wrunlock(s->target_bs);
bdrv_graph_wrunlock();
/*
* This call will do I/O, so the graph can change again from here on.
@ -366,10 +366,10 @@ void stream_start(const char *job_id, BlockDriverState *bs,
* already have our own plans. Also don't allow resize as the image size is
* queried only at the job start and then cached.
*/
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
if (block_job_add_bdrv(&s->common, "active node", bs, 0,
basic_flags | BLK_PERM_WRITE, errp)) {
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
goto fail;
}
@ -389,11 +389,11 @@ void stream_start(const char *job_id, BlockDriverState *bs,
ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
basic_flags, errp);
if (ret < 0) {
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
goto fail;
}
}
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
s->base_overlay = base_overlay;
s->above_base = above_base;

20
block/vmdk.c
View File

@ -272,7 +272,7 @@ static void vmdk_free_extents(BlockDriverState *bs)
BDRVVmdkState *s = bs->opaque;
VmdkExtent *e;
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
for (i = 0; i < s->num_extents; i++) {
e = &s->extents[i];
g_free(e->l1_table);
@ -283,7 +283,7 @@ static void vmdk_free_extents(BlockDriverState *bs)
bdrv_unref_child(bs, e->file);
}
}
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
g_free(s->extents);
}
@ -1247,9 +1247,9 @@ vmdk_parse_extents(const char *desc, BlockDriverState *bs, QDict *options,
0, 0, 0, 0, 0, &extent, errp);
if (ret < 0) {
bdrv_graph_rdunlock_main_loop();
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, extent_file);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
bdrv_graph_rdlock_main_loop();
goto out;
}
@ -1266,9 +1266,9 @@ vmdk_parse_extents(const char *desc, BlockDriverState *bs, QDict *options,
g_free(buf);
if (ret) {
bdrv_graph_rdunlock_main_loop();
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, extent_file);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
bdrv_graph_rdlock_main_loop();
goto out;
}
@ -1277,9 +1277,9 @@ vmdk_parse_extents(const char *desc, BlockDriverState *bs, QDict *options,
ret = vmdk_open_se_sparse(bs, extent_file, bs->open_flags, errp);
if (ret) {
bdrv_graph_rdunlock_main_loop();
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, extent_file);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
bdrv_graph_rdlock_main_loop();
goto out;
}
@ -1287,9 +1287,9 @@ vmdk_parse_extents(const char *desc, BlockDriverState *bs, QDict *options,
} else {
error_setg(errp, "Unsupported extent type '%s'", type);
bdrv_graph_rdunlock_main_loop();
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(bs, extent_file);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
bdrv_graph_rdlock_main_loop();
ret = -ENOTSUP;
goto out;

6
block/write-threshold.c
View File

@ -33,7 +33,6 @@ void qmp_block_set_write_threshold(const char *node_name,
Error **errp)
{
BlockDriverState *bs;
AioContext *aio_context;
bs = bdrv_find_node(node_name);
if (!bs) {
@ -41,12 +40,7 @@ void qmp_block_set_write_threshold(const char *node_name,
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_write_threshold_set(bs, threshold_bytes);
aio_context_release(aio_context);
}
void bdrv_write_threshold_check_write(BlockDriverState *bs, int64_t offset,

320
blockdev.c
View File

File diff suppressed because it is too large Load Diff

30
blockjob.c
View File

@ -198,9 +198,7 @@ void block_job_remove_all_bdrv(BlockJob *job)
* one to make sure that such a concurrent access does not attempt
* to process an already freed BdrvChild.
*/
aio_context_release(job->job.aio_context);
bdrv_graph_wrlock(NULL);
aio_context_acquire(job->job.aio_context);
bdrv_graph_wrlock();
while (job->nodes) {
GSList *l = job->nodes;
BdrvChild *c = l->data;
@ -212,7 +210,7 @@ void block_job_remove_all_bdrv(BlockJob *job)
g_slist_free_1(l);
}
bdrv_graph_wrunlock_ctx(job->job.aio_context);
bdrv_graph_wrunlock();
}
bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs)
@ -234,28 +232,12 @@ int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
uint64_t perm, uint64_t shared_perm, Error **errp)
{
BdrvChild *c;
AioContext *ctx = bdrv_get_aio_context(bs);
bool need_context_ops;
GLOBAL_STATE_CODE();
bdrv_ref(bs);
need_context_ops = ctx != job->job.aio_context;
if (need_context_ops) {
if (job->job.aio_context != qemu_get_aio_context()) {
aio_context_release(job->job.aio_context);
}
aio_context_acquire(ctx);
}
c = bdrv_root_attach_child(bs, name, &child_job, 0, perm, shared_perm, job,
errp);
if (need_context_ops) {
aio_context_release(ctx);
if (job->job.aio_context != qemu_get_aio_context()) {
aio_context_acquire(job->job.aio_context);
}
}
if (c == NULL) {
return -EPERM;
}
@ -514,7 +496,7 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
int ret;
GLOBAL_STATE_CODE();
bdrv_graph_wrlock(bs);
bdrv_graph_wrlock();
if (job_id == NULL && !(flags & JOB_INTERNAL)) {
job_id = bdrv_get_device_name(bs);
@ -523,7 +505,7 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
job = job_create(job_id, &driver->job_driver, txn, bdrv_get_aio_context(bs),
flags, cb, opaque, errp);
if (job == NULL) {
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
return NULL;
}
@ -563,11 +545,11 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
goto fail;
}
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
return job;
fail:
bdrv_graph_wrunlock(bs);
bdrv_graph_wrunlock();
job_early_fail(&job->job);
return NULL;
}

45
docs/devel/multiple-iothreads.txt
View File

@ -88,27 +88,18 @@ loop, depending on which AioContext instance the caller passes in.
How to synchronize with an IOThread
-----------------------------------
AioContext is not thread-safe so some rules must be followed when using file
descriptors, event notifiers, timers, or BHs across threads:
Variables that can be accessed by multiple threads require some form of
synchronization such as qemu_mutex_lock(), rcu_read_lock(), etc.
1. AioContext functions can always be called safely. They handle their
own locking internally.
2. Other threads wishing to access the AioContext must use
aio_context_acquire()/aio_context_release() for mutual exclusion. Once the
context is acquired no other thread can access it or run event loop iterations
in this AioContext.
Legacy code sometimes nests aio_context_acquire()/aio_context_release() calls.
Do not use nesting anymore, it is incompatible with the BDRV_POLL_WHILE() macro
used in the block layer and can lead to hangs.
There is currently no lock ordering rule if a thread needs to acquire multiple
AioContexts simultaneously. Therefore, it is only safe for code holding the
QEMU global mutex to acquire other AioContexts.
AioContext functions like aio_set_fd_handler(), aio_set_event_notifier(),
aio_bh_new(), and aio_timer_new() are thread-safe. They can be used to trigger
activity in an IOThread.
Side note: the best way to schedule a function call across threads is to call
aio_bh_schedule_oneshot(). No acquire/release or locking is needed.
aio_bh_schedule_oneshot().
The main loop thread can wait synchronously for a condition using
AIO_WAIT_WHILE().
AioContext and the block layer
------------------------------
@ -124,22 +115,16 @@ Block layer code must therefore expect to run in an IOThread and avoid using
old APIs that implicitly use the main loop. See the "How to program for
IOThreads" above for information on how to do that.
If main loop code such as a QMP function wishes to access a BlockDriverState
it must first call aio_context_acquire(bdrv_get_aio_context(bs)) to ensure
that callbacks in the IOThread do not run in parallel.
Code running in the monitor typically needs to ensure that past
requests from the guest are completed. When a block device is running
in an IOThread, the IOThread can also process requests from the guest
(via ioeventfd). To achieve both objects, wrap the code between
bdrv_drained_begin() and bdrv_drained_end(), thus creating a "drained
section". The functions must be called between aio_context_acquire()
and aio_context_release(). You can freely release and re-acquire the
AioContext within a drained section.
section".
Long-running jobs (usually in the form of coroutines) are best scheduled in
the BlockDriverState's AioContext to avoid the need to acquire/release around
each bdrv_*() call. The functions bdrv_add/remove_aio_context_notifier,
or alternatively blk_add/remove_aio_context_notifier if you use BlockBackends,
can be used to get a notification whenever bdrv_try_change_aio_context() moves a
Long-running jobs (usually in the form of coroutines) are often scheduled in
the BlockDriverState's AioContext. The functions
bdrv_add/remove_aio_context_notifier, or alternatively
blk_add/remove_aio_context_notifier if you use BlockBackends, can be used to
get a notification whenever bdrv_try_change_aio_context() moves a
BlockDriverState to a different AioContext.

165
hw/block/dataplane/virtio-blk.c
View File

@ -32,13 +32,11 @@ struct VirtIOBlockDataPlane {
VirtIOBlkConf *conf;
VirtIODevice *vdev;
/* Note that these EventNotifiers are assigned by value. This is
* fine as long as you do not call event_notifier_cleanup on them
* (because you don't own the file descriptor or handle; you just
* use it).
/*
* The AioContext for each virtqueue. The BlockDriverState will use the
* first element as its AioContext.
*/
IOThread *iothread;
AioContext *ctx;
AioContext **vq_aio_context;
};
/* Raise an interrupt to signal guest, if necessary */
@ -47,6 +45,45 @@ void virtio_blk_data_plane_notify(VirtIOBlockDataPlane *s, VirtQueue *vq)
virtio_notify_irqfd(s->vdev, vq);
}
/* Generate vq:AioContext mappings from a validated iothread-vq-mapping list */
static void
apply_vq_mapping(IOThreadVirtQueueMappingList *iothread_vq_mapping_list,
AioContext **vq_aio_context, uint16_t num_queues)
{
IOThreadVirtQueueMappingList *node;
size_t num_iothreads = 0;
size_t cur_iothread = 0;
for (node = iothread_vq_mapping_list; node; node = node->next) {
num_iothreads++;
}
for (node = iothread_vq_mapping_list; node; node = node->next) {
IOThread *iothread = iothread_by_id(node->value->iothread);
AioContext *ctx = iothread_get_aio_context(iothread);
/* Released in virtio_blk_data_plane_destroy() */
object_ref(OBJECT(iothread));
if (node->value->vqs) {
uint16List *vq;
/* Explicit vq:IOThread assignment */
for (vq = node->value->vqs; vq; vq = vq->next) {
vq_aio_context[vq->value] = ctx;
}
} else {
/* Round-robin vq:IOThread assignment */
for (unsigned i = cur_iothread; i < num_queues;
i += num_iothreads) {
vq_aio_context[i] = ctx;
}
}
cur_iothread++;
}
}
/* Context: QEMU global mutex held */
bool virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
VirtIOBlockDataPlane **dataplane,
@ -58,7 +95,7 @@ bool virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
*dataplane = NULL;
if (conf->iothread) {
if (conf->iothread || conf->iothread_vq_mapping_list) {
if (!k->set_guest_notifiers || !k->ioeventfd_assign) {
error_setg(errp,
"device is incompatible with iothread "
@ -86,13 +123,24 @@ bool virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
s = g_new0(VirtIOBlockDataPlane, 1);
s->vdev = vdev;
s->conf = conf;
s->vq_aio_context = g_new(AioContext *, conf->num_queues);
if (conf->iothread) {
s->iothread = conf->iothread;
object_ref(OBJECT(s->iothread));
s->ctx = iothread_get_aio_context(s->iothread);
if (conf->iothread_vq_mapping_list) {
apply_vq_mapping(conf->iothread_vq_mapping_list, s->vq_aio_context,
conf->num_queues);
} else if (conf->iothread) {
AioContext *ctx = iothread_get_aio_context(conf->iothread);
for (unsigned i = 0; i < conf->num_queues; i++) {
s->vq_aio_context[i] = ctx;
}
/* Released in virtio_blk_data_plane_destroy() */
object_ref(OBJECT(conf->iothread));
} else {
s->ctx = qemu_get_aio_context();
AioContext *ctx = qemu_get_aio_context();
for (unsigned i = 0; i < conf->num_queues; i++) {
s->vq_aio_context[i] = ctx;
}
}
*dataplane = s;
@ -104,6 +152,7 @@ bool virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf,
void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s)
{
VirtIOBlock *vblk;
VirtIOBlkConf *conf = s->conf;
if (!s) {
return;
@ -111,9 +160,21 @@ void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s)
vblk = VIRTIO_BLK(s->vdev);
assert(!vblk->dataplane_started);
if (s->iothread) {
object_unref(OBJECT(s->iothread));
if (conf->iothread_vq_mapping_list) {
IOThreadVirtQueueMappingList *node;
for (node = conf->iothread_vq_mapping_list; node; node = node->next) {
IOThread *iothread = iothread_by_id(node->value->iothread);
object_unref(OBJECT(iothread));
}
}
if (conf->iothread) {
object_unref(OBJECT(conf->iothread));
}
g_free(s->vq_aio_context);
g_free(s);
}
@ -124,7 +185,6 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
VirtIOBlockDataPlane *s = vblk->dataplane;
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vblk)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
AioContext *old_context;
unsigned i;
unsigned nvqs = s->conf->num_queues;
Error *local_err = NULL;
@ -178,22 +238,13 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
trace_virtio_blk_data_plane_start(s);
old_context = blk_get_aio_context(s->conf->conf.blk);
aio_context_acquire(old_context);
r = blk_set_aio_context(s->conf->conf.blk, s->ctx, &local_err);
aio_context_release(old_context);
r = blk_set_aio_context(s->conf->conf.blk, s->vq_aio_context[0],
&local_err);
if (r < 0) {
error_report_err(local_err);
goto fail_aio_context;
}
/* Kick right away to begin processing requests already in vring */
for (i = 0; i < nvqs; i++) {
VirtQueue *vq = virtio_get_queue(s->vdev, i);
event_notifier_set(virtio_queue_get_host_notifier(vq));
}
/*
* These fields must be visible to the IOThread when it processes the
* virtqueue, otherwise it will think dataplane has not started yet.
@ -208,13 +259,15 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
/* Get this show started by hooking up our callbacks */
if (!blk_in_drain(s->conf->conf.blk)) {
aio_context_acquire(s->ctx);
for (i = 0; i < nvqs; i++) {
VirtQueue *vq = virtio_get_queue(s->vdev, i);
AioContext *ctx = s->vq_aio_context[i];
virtio_queue_aio_attach_host_notifier(vq, s->ctx);
/* Kick right away to begin processing requests already in vring */
event_notifier_set(virtio_queue_get_host_notifier(vq));
virtio_queue_aio_attach_host_notifier(vq, ctx);
}
aio_context_release(s->ctx);
}
return 0;
@ -242,23 +295,18 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
*
* Context: BH in IOThread
*/
static void virtio_blk_data_plane_stop_bh(void *opaque)
static void virtio_blk_data_plane_stop_vq_bh(void *opaque)
{
VirtIOBlockDataPlane *s = opaque;
unsigned i;
VirtQueue *vq = opaque;
EventNotifier *host_notifier = virtio_queue_get_host_notifier(vq);
for (i = 0; i < s->conf->num_queues; i++) {
VirtQueue *vq = virtio_get_queue(s->vdev, i);
EventNotifier *host_notifier = virtio_queue_get_host_notifier(vq);
virtio_queue_aio_detach_host_notifier(vq, qemu_get_current_aio_context());
virtio_queue_aio_detach_host_notifier(vq, s->ctx);
/*
* Test and clear notifier after disabling event, in case poll callback
* didn't have time to run.
*/
virtio_queue_host_notifier_read(host_notifier);
}
/*
* Test and clear notifier after disabling event, in case poll callback
* didn't have time to run.
*/
virtio_queue_host_notifier_read(host_notifier);
}
/* Context: QEMU global mutex held */
@ -285,7 +333,12 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev)
trace_virtio_blk_data_plane_stop(s);
if (!blk_in_drain(s->conf->conf.blk)) {
aio_wait_bh_oneshot(s->ctx, virtio_blk_data_plane_stop_bh, s);
for (i = 0; i < nvqs; i++) {
VirtQueue *vq = virtio_get_queue(s->vdev, i);
AioContext *ctx = s->vq_aio_context[i];
aio_wait_bh_oneshot(ctx, virtio_blk_data_plane_stop_vq_bh, vq);
}
}
/*
@ -314,8 +367,6 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev)
*/
vblk->dataplane_started = false;
aio_context_acquire(s->ctx);
/* Wait for virtio_blk_dma_restart_bh() and in flight I/O to complete */
blk_drain(s->conf->conf.blk);
@ -325,10 +376,28 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev)
*/
blk_set_aio_context(s->conf->conf.blk, qemu_get_aio_context(), NULL);
aio_context_release(s->ctx);
/* Clean up guest notifier (irq) */
k->set_guest_notifiers(qbus->parent, nvqs, false);
s->stopping = false;
}
void virtio_blk_data_plane_detach(VirtIOBlockDataPlane *s)
{
VirtIODevice *vdev = VIRTIO_DEVICE(s->vdev);
for (uint16_t i = 0; i < s->conf->num_queues; i++) {
VirtQueue *vq = virtio_get_queue(vdev, i);
virtio_queue_aio_detach_host_notifier(vq, s->vq_aio_context[i]);
}
}
void virtio_blk_data_plane_attach(VirtIOBlockDataPlane *s)
{
VirtIODevice *vdev = VIRTIO_DEVICE(s->vdev);
for (uint16_t i = 0; i < s->conf->num_queues; i++) {
VirtQueue *vq = virtio_get_queue(vdev, i);
virtio_queue_aio_attach_host_notifier(vq, s->vq_aio_context[i]);
}
}

3
hw/block/dataplane/virtio-blk.h
View File

@ -28,4 +28,7 @@ void virtio_blk_data_plane_notify(VirtIOBlockDataPlane *s, VirtQueue *vq);
int virtio_blk_data_plane_start(VirtIODevice *vdev);
void virtio_blk_data_plane_stop(VirtIODevice *vdev);
void virtio_blk_data_plane_detach(VirtIOBlockDataPlane *s);
void virtio_blk_data_plane_attach(VirtIOBlockDataPlane *s);
#endif /* HW_DATAPLANE_VIRTIO_BLK_H */

17
hw/block/dataplane/xen-block.c
View File

@ -260,8 +260,6 @@ static void xen_block_complete_aio(void *opaque, int ret)
XenBlockRequest *request = opaque;
XenBlockDataPlane *dataplane = request->dataplane;
aio_context_acquire(dataplane->ctx);
if (ret != 0) {
error_report("%s I/O error",
request->req.operation == BLKIF_OP_READ ?
@ -273,10 +271,10 @@ static void xen_block_complete_aio(void *opaque, int ret)
if (request->presync) {
request->presync = 0;
xen_block_do_aio(request);
goto done;
return;
}
if (request->aio_inflight > 0) {
goto done;
return;
}
switch (request->req.operation) {
@ -318,9 +316,6 @@ static void xen_block_complete_aio(void *opaque, int ret)
if (dataplane->more_work) {
qemu_bh_schedule(dataplane->bh);
}
done:
aio_context_release(dataplane->ctx);
}
static bool xen_block_split_discard(XenBlockRequest *request,
@ -601,9 +596,7 @@ static void xen_block_dataplane_bh(void *opaque)
{
XenBlockDataPlane *dataplane = opaque;
aio_context_acquire(dataplane->ctx);
xen_block_handle_requests(dataplane);
aio_context_release(dataplane->ctx);
}
static bool xen_block_dataplane_event(void *opaque)
@ -703,10 +696,8 @@ void xen_block_dataplane_stop(XenBlockDataPlane *dataplane)
xen_block_dataplane_detach(dataplane);
}
aio_context_acquire(dataplane->ctx);
/* Xen doesn't have multiple users for nodes, so this can't fail */
blk_set_aio_context(dataplane->blk, qemu_get_aio_context(), &error_abort);
aio_context_release(dataplane->ctx);
/*
* Now that the context has been moved onto the main thread, cancel
@ -752,7 +743,6 @@ void xen_block_dataplane_start(XenBlockDataPlane *dataplane,
{
ERRP_GUARD();
XenDevice *xendev = dataplane->xendev;
AioContext *old_context;
unsigned int ring_size;
unsigned int i;
@ -836,11 +826,8 @@ void xen_block_dataplane_start(XenBlockDataPlane *dataplane,
goto stop;
}
old_context = blk_get_aio_context(dataplane->blk);
aio_context_acquire(old_context);
/* If other users keep the BlockBackend in the iothread, that's ok */
blk_set_aio_context(dataplane->blk, dataplane->ctx, NULL);
aio_context_release(old_context);
if (!blk_in_drain(dataplane->blk)) {
xen_block_dataplane_attach(dataplane);

209
hw/block/virtio-blk.c
View File

@ -82,8 +82,11 @@ static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
/* Break the link as the next request is going to be parsed from the
* ring again. Otherwise we may end up doing a double completion! */
req->mr_next = NULL;
req->next = s->rq;
s->rq = req;
WITH_QEMU_LOCK_GUARD(&s->rq_lock) {
req->next = s->rq;
s->rq = req;
}
} else if (action == BLOCK_ERROR_ACTION_REPORT) {
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
if (acct_failed) {
@ -102,7 +105,6 @@ static void virtio_blk_rw_complete(void *opaque, int ret)
VirtIOBlock *s = next->dev;
VirtIODevice *vdev = VIRTIO_DEVICE(s);
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
while (next) {
VirtIOBlockReq *req = next;
next = req->mr_next;
@ -135,7 +137,6 @@ static void virtio_blk_rw_complete(void *opaque, int ret)
block_acct_done(blk_get_stats(s->blk), &req->acct);
virtio_blk_free_request(req);
}
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
}
static void virtio_blk_flush_complete(void *opaque, int ret)
@ -143,19 +144,13 @@ static void virtio_blk_flush_complete(void *opaque, int ret)
VirtIOBlockReq *req = opaque;
VirtIOBlock *s = req->dev;
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
if (ret) {
if (virtio_blk_handle_rw_error(req, -ret, 0, true)) {
goto out;
}
if (ret && virtio_blk_handle_rw_error(req, -ret, 0, true)) {
return;
}
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
block_acct_done(blk_get_stats(s->blk), &req->acct);
virtio_blk_free_request(req);
out:
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
}
static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
@ -165,11 +160,8 @@ static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) &
~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES;
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
if (ret) {
if (virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
goto out;
}
if (ret && virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
return;
}
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
@ -177,9 +169,6 @@ static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
block_acct_done(blk_get_stats(s->blk), &req->acct);
}
virtio_blk_free_request(req);
out:
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
}
#ifdef __linux__
@ -226,10 +215,8 @@ static void virtio_blk_ioctl_complete(void *opaque, int status)
virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
out:
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
virtio_blk_req_complete(req, status);
virtio_blk_free_request(req);
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
g_free(ioctl_req);
}
@ -669,7 +656,6 @@ static void virtio_blk_zone_report_complete(void *opaque, int ret)
{
ZoneCmdData *data = opaque;
VirtIOBlockReq *req = data->req;
VirtIOBlock *s = req->dev;
VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
struct iovec *in_iov = data->in_iov;
unsigned in_num = data->in_num;
@ -760,10 +746,8 @@ static void virtio_blk_zone_report_complete(void *opaque, int ret)
}
out:
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
virtio_blk_req_complete(req, err_status);
virtio_blk_free_request(req);
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
g_free(data->zone_report_data.zones);
g_free(data);
}
@ -826,10 +810,8 @@ static void virtio_blk_zone_mgmt_complete(void *opaque, int ret)
err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
}
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
virtio_blk_req_complete(req, err_status);
virtio_blk_free_request(req);
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
}
static int virtio_blk_handle_zone_mgmt(VirtIOBlockReq *req, BlockZoneOp op)
@ -879,7 +861,6 @@ static void virtio_blk_zone_append_complete(void *opaque, int ret)
{
ZoneCmdData *data = opaque;
VirtIOBlockReq *req = data->req;
VirtIOBlock *s = req->dev;
VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
int64_t append_sector, n;
uint8_t err_status = VIRTIO_BLK_S_OK;
@ -902,10 +883,8 @@ static void virtio_blk_zone_append_complete(void *opaque, int ret)
trace_virtio_blk_zone_append_complete(vdev, req, append_sector, ret);
out:
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
virtio_blk_req_complete(req, err_status);
virtio_blk_free_request(req);
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
g_free(data);
}
@ -941,10 +920,8 @@ static int virtio_blk_handle_zone_append(VirtIOBlockReq *req,
return 0;
out:
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
virtio_blk_req_complete(req, err_status);
virtio_blk_free_request(req);
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
return err_status;
}
@ -1134,7 +1111,6 @@ void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
MultiReqBuffer mrb = {};
bool suppress_notifications = virtio_queue_get_notification(vq);
aio_context_acquire(blk_get_aio_context(s->blk));
defer_call_begin();
do {
@ -1160,7 +1136,6 @@ void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
}
defer_call_end();
aio_context_release(blk_get_aio_context(s->blk));
}
static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
@ -1176,6 +1151,7 @@ static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
return;
}
}
virtio_blk_handle_vq(s, vq);
}
@ -1183,12 +1159,14 @@ static void virtio_blk_dma_restart_bh(void *opaque)
{
VirtIOBlock *s = opaque;
VirtIOBlockReq *req = s->rq;
VirtIOBlockReq *req;
MultiReqBuffer mrb = {};
s->rq = NULL;
WITH_QEMU_LOCK_GUARD(&s->rq_lock) {
req = s->rq;
s->rq = NULL;
}
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
while (req) {
VirtIOBlockReq *next = req->next;
if (virtio_blk_handle_request(req, &mrb)) {
@ -1212,8 +1190,6 @@ static void virtio_blk_dma_restart_bh(void *opaque)
/* Paired with inc in virtio_blk_dma_restart_cb() */
blk_dec_in_flight(s->conf.conf.blk);
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
}
static void virtio_blk_dma_restart_cb(void *opaque, bool running,
@ -1235,25 +1211,28 @@ static void virtio_blk_dma_restart_cb(void *opaque, bool running,
static void virtio_blk_reset(VirtIODevice *vdev)
{
VirtIOBlock *s = VIRTIO_BLK(vdev);
AioContext *ctx;
VirtIOBlockReq *req;
ctx = blk_get_aio_context(s->blk);
aio_context_acquire(ctx);
/* Dataplane has stopped... */
assert(!s->dataplane_started);
/* ...but requests may still be in flight. */
blk_drain(s->blk);
/* We drop queued requests after blk_drain() because blk_drain() itself can
* produce them. */
while (s->rq) {
req = s->rq;
s->rq = req->next;
virtqueue_detach_element(req->vq, &req->elem, 0);
virtio_blk_free_request(req);
WITH_QEMU_LOCK_GUARD(&s->rq_lock) {
while (s->rq) {
req = s->rq;
s->rq = req->next;
/* No other threads can access req->vq here */
virtqueue_detach_element(req->vq, &req->elem, 0);
virtio_blk_free_request(req);
}
}
aio_context_release(ctx);
assert(!s->dataplane_started);
blk_set_enable_write_cache(s->blk, s->original_wce);
}
@ -1268,10 +1247,6 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
uint64_t capacity;
int64_t length;
int blk_size = conf->logical_block_size;
AioContext *ctx;
ctx = blk_get_aio_context(s->blk);
aio_context_acquire(ctx);
blk_get_geometry(s->blk, &capacity);
memset(&blkcfg, 0, sizeof(blkcfg));
@ -1295,7 +1270,6 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
* per track (cylinder).
*/
length = blk_getlength(s->blk);
aio_context_release(ctx);
if (length > 0 && length / conf->heads / conf->secs % blk_size) {
blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
} else {
@ -1362,9 +1336,7 @@ static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
memcpy(&blkcfg, config, s->config_size);
aio_context_acquire(blk_get_aio_context(s->blk));
blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
aio_context_release(blk_get_aio_context(s->blk));
}
static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
@ -1432,29 +1404,31 @@ static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
* s->blk would erroneously be placed in writethrough mode.
*/
if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
aio_context_acquire(blk_get_aio_context(s->blk));
blk_set_enable_write_cache(s->blk,
virtio_vdev_has_feature(vdev,
VIRTIO_BLK_F_WCE));
aio_context_release(blk_get_aio_context(s->blk));
}
}
static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
{
VirtIOBlock *s = VIRTIO_BLK(vdev);
VirtIOBlockReq *req = s->rq;
while (req) {
qemu_put_sbyte(f, 1);
WITH_QEMU_LOCK_GUARD(&s->rq_lock) {
VirtIOBlockReq *req = s->rq;
if (s->conf.num_queues > 1) {
qemu_put_be32(f, virtio_get_queue_index(req->vq));
while (req) {
qemu_put_sbyte(f, 1);
if (s->conf.num_queues > 1) {
qemu_put_be32(f, virtio_get_queue_index(req->vq));
}
qemu_put_virtqueue_element(vdev, f, &req->elem);
req = req->next;
}
qemu_put_virtqueue_element(vdev, f, &req->elem);
req = req->next;
}
qemu_put_sbyte(f, 0);
}
@ -1480,13 +1454,78 @@ static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq));
virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req);
req->next = s->rq;
s->rq = req;
WITH_QEMU_LOCK_GUARD(&s->rq_lock) {
req->next = s->rq;
s->rq = req;
}
}
return 0;
}
static bool
validate_iothread_vq_mapping_list(IOThreadVirtQueueMappingList *list,
uint16_t num_queues, Error **errp)
{
g_autofree unsigned long *vqs = bitmap_new(num_queues);
g_autoptr(GHashTable) iothreads =
g_hash_table_new(g_str_hash, g_str_equal);
for (IOThreadVirtQueueMappingList *node = list; node; node = node->next) {
const char *name = node->value->iothread;
uint16List *vq;
if (!iothread_by_id(name)) {
error_setg(errp, "IOThread \"%s\" object does not exist", name);
return false;
}
if (!g_hash_table_add(iothreads, (gpointer)name)) {
error_setg(errp,
"duplicate IOThread name \"%s\" in iothread-vq-mapping",
name);
return false;
}
if (node != list) {
if (!!node->value->vqs != !!list->value->vqs) {
error_setg(errp, "either all items in iothread-vq-mapping "
"must have vqs or none of them must have it");
return false;
}
}
for (vq = node->value->vqs; vq; vq = vq->next) {
if (vq->value >= num_queues) {
error_setg(errp, "vq index %u for IOThread \"%s\" must be "
"less than num_queues %u in iothread-vq-mapping",
vq->value, name, num_queues);
return false;
}
if (test_and_set_bit(vq->value, vqs)) {
error_setg(errp, "cannot assign vq %u to IOThread \"%s\" "
"because it is already assigned", vq->value, name);
return false;
}
}
}
if (list->value->vqs) {
for (uint16_t i = 0; i < num_queues; i++) {
if (!test_bit(i, vqs)) {
error_setg(errp,
"missing vq %u IOThread assignment in iothread-vq-mapping",
i);
return false;
}
}
}
return true;
}
static void virtio_resize_cb(void *opaque)
{
VirtIODevice *vdev = opaque;
@ -1511,34 +1550,24 @@ static void virtio_blk_resize(void *opaque)
static void virtio_blk_drained_begin(void *opaque)
{
VirtIOBlock *s = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
AioContext *ctx = blk_get_aio_context(s->conf.conf.blk);
if (!s->dataplane || !s->dataplane_started) {
return;
}
for (uint16_t i = 0; i < s->conf.num_queues; i++) {
VirtQueue *vq = virtio_get_queue(vdev, i);
virtio_queue_aio_detach_host_notifier(vq, ctx);
}
virtio_blk_data_plane_detach(s->dataplane);
}
/* Resume virtqueue ioeventfd processing after drain */
static void virtio_blk_drained_end(void *opaque)
{
VirtIOBlock *s = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
AioContext *ctx = blk_get_aio_context(s->conf.conf.blk);
if (!s->dataplane || !s->dataplane_started) {
return;
}
for (uint16_t i = 0; i < s->conf.num_queues; i++) {
VirtQueue *vq = virtio_get_queue(vdev, i);
virtio_queue_aio_attach_host_notifier(vq, ctx);
}
virtio_blk_data_plane_attach(s->dataplane);
}
static const BlockDevOps virtio_block_ops = {
@ -1624,10 +1653,25 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
return;
}
if (conf->iothread_vq_mapping_list) {
if (conf->iothread) {
error_setg(errp, "iothread and iothread-vq-mapping properties "
"cannot be set at the same time");
return;
}
if (!validate_iothread_vq_mapping_list(conf->iothread_vq_mapping_list,
conf->num_queues, errp)) {
return;
}
}
s->config_size = virtio_get_config_size(&virtio_blk_cfg_size_params,
s->host_features);
virtio_init(vdev, VIRTIO_ID_BLOCK, s->config_size);
qemu_mutex_init(&s->rq_lock);
s->blk = conf->conf.blk;
s->rq = NULL;
s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
@ -1679,6 +1723,7 @@ static void virtio_blk_device_unrealize(DeviceState *dev)
virtio_del_queue(vdev, i);
}
qemu_coroutine_dec_pool_size(conf->num_queues * conf->queue_size / 2);
qemu_mutex_destroy(&s->rq_lock);
blk_ram_registrar_destroy(&s->blk_ram_registrar);
qemu_del_vm_change_state_handler(s->change);
blockdev_mark_auto_del(s->blk);
@ -1723,6 +1768,8 @@ static Property virtio_blk_properties[] = {
DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true),
DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD,
IOThread *),
DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST("iothread-vq-mapping", VirtIOBlock,
conf.iothread_vq_mapping_list),
DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features,
VIRTIO_BLK_F_DISCARD, true),
DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock,

55
hw/core/qdev-properties-system.c
View File

@ -18,6 +18,7 @@
#include "qapi/qapi-types-block.h"
#include "qapi/qapi-types-machine.h"
#include "qapi/qapi-types-migration.h"
#include "qapi/qapi-visit-virtio.h"
#include "qapi/qmp/qerror.h"
#include "qemu/ctype.h"
#include "qemu/cutils.h"
@ -120,9 +121,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
"node");
}
aio_context_acquire(ctx);
blk_replace_bs(blk, bs, errp);
aio_context_release(ctx);
return;
}
@ -148,10 +147,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
0, BLK_PERM_ALL);
blk_created = true;
aio_context_acquire(ctx);
ret = blk_insert_bs(blk, bs, errp);
aio_context_release(ctx);
if (ret < 0) {
goto fail;
}
@ -207,12 +203,8 @@ static void release_drive(Object *obj, const char *name, void *opaque)
BlockBackend **ptr = object_field_prop_ptr(obj, prop);
if (*ptr) {
AioContext *ctx = blk_get_aio_context(*ptr);
aio_context_acquire(ctx);
blockdev_auto_del(*ptr);
blk_detach_dev(*ptr, dev);
aio_context_release(ctx);
}
}
@ -1169,3 +1161,48 @@ const PropertyInfo qdev_prop_cpus390entitlement = {
.set = qdev_propinfo_set_enum,
.set_default_value = qdev_propinfo_set_default_value_enum,
};
/* --- IOThreadVirtQueueMappingList --- */
static void get_iothread_vq_mapping_list(Object *obj, Visitor *v,
const char *name, void *opaque, Error **errp)
{
IOThreadVirtQueueMappingList **prop_ptr =
object_field_prop_ptr(obj, opaque);
visit_type_IOThreadVirtQueueMappingList(v, name, prop_ptr, errp);
}
static void set_iothread_vq_mapping_list(Object *obj, Visitor *v,
const char *name, void *opaque, Error **errp)
{
IOThreadVirtQueueMappingList **prop_ptr =
object_field_prop_ptr(obj, opaque);
IOThreadVirtQueueMappingList *list;
if (!visit_type_IOThreadVirtQueueMappingList(v, name, &list, errp)) {
return;
}
qapi_free_IOThreadVirtQueueMappingList(*prop_ptr);
*prop_ptr = list;
}
static void release_iothread_vq_mapping_list(Object *obj,
const char *name, void *opaque)
{
IOThreadVirtQueueMappingList **prop_ptr =
object_field_prop_ptr(obj, opaque);
qapi_free_IOThreadVirtQueueMappingList(*prop_ptr);
*prop_ptr = NULL;
}
const PropertyInfo qdev_prop_iothread_vq_mapping_list = {
.name = "IOThreadVirtQueueMappingList",
.description = "IOThread virtqueue mapping list [{\"iothread\":\"<id>\", "
"\"vqs\":[1,2,3,...]},...]",
.get = get_iothread_vq_mapping_list,
.set = set_iothread_vq_mapping_list,
.release = release_iothread_vq_mapping_list,
};

18
hw/core/qdev-properties.c
View File

@ -1076,16 +1076,18 @@ void device_class_set_props(DeviceClass *dc, Property *props)
void qdev_alias_all_properties(DeviceState *target, Object *source)
{
ObjectClass *class;
Property *prop;
ObjectPropertyIterator iter;
ObjectProperty *prop;
class = object_get_class(OBJECT(target));
do {
DeviceClass *dc = DEVICE_CLASS(class);
for (prop = dc->props_; prop && prop->name; prop++) {
object_property_add_alias(source, prop->name,
OBJECT(target), prop->name);
object_class_property_iter_init(&iter, class);
while ((prop = object_property_iter_next(&iter))) {
if (object_property_find(source, prop->name)) {
continue; /* skip duplicate properties */
}
class = object_class_get_parent(class);
} while (class != object_class_by_name(TYPE_DEVICE));
object_property_add_alias(source, prop->name,
OBJECT(target), prop->name);
}
}

183
hw/scsi/scsi-bus.c
View File

@ -85,6 +85,89 @@ SCSIDevice *scsi_device_get(SCSIBus *bus, int channel, int id, int lun)
return d;
}
/*
* Invoke @fn() for each enqueued request in device @s. Must be called from the
* main loop thread while the guest is stopped. This is only suitable for
* vmstate ->put(), use scsi_device_for_each_req_async() for other cases.
*/
static void scsi_device_for_each_req_sync(SCSIDevice *s,
void (*fn)(SCSIRequest *, void *),
void *opaque)
{
SCSIRequest *req;
SCSIRequest *next_req;
assert(!runstate_is_running());
assert(qemu_in_main_thread());
QTAILQ_FOREACH_SAFE(req, &s->requests, next, next_req) {
fn(req, opaque);
}
}
typedef struct {
SCSIDevice *s;
void (*fn)(SCSIRequest *, void *);
void *fn_opaque;
} SCSIDeviceForEachReqAsyncData;
static void scsi_device_for_each_req_async_bh(void *opaque)
{
g_autofree SCSIDeviceForEachReqAsyncData *data = opaque;
SCSIDevice *s = data->s;
AioContext *ctx;
SCSIRequest *req;
SCSIRequest *next;
/*
* If the AioContext changed before this BH was called then reschedule into
* the new AioContext before accessing ->requests. This can happen when
* scsi_device_for_each_req_async() is called and then the AioContext is
* changed before BHs are run.
*/
ctx = blk_get_aio_context(s->conf.blk);
if (ctx != qemu_get_current_aio_context()) {
aio_bh_schedule_oneshot(ctx, scsi_device_for_each_req_async_bh,
g_steal_pointer(&data));
return;
}
QTAILQ_FOREACH_SAFE(req, &s->requests, next, next) {
data->fn(req, data->fn_opaque);
}
/* Drop the reference taken by scsi_device_for_each_req_async() */
object_unref(OBJECT(s));
}
/*
* Schedule @fn() to be invoked for each enqueued request in device @s. @fn()
* runs in the AioContext that is executing the request.
*/
static void scsi_device_for_each_req_async(SCSIDevice *s,
void (*fn)(SCSIRequest *, void *),
void *opaque)
{
assert(qemu_in_main_thread());
SCSIDeviceForEachReqAsyncData *data =
g_new(SCSIDeviceForEachReqAsyncData, 1);
data->s = s;
data->fn = fn;
data->fn_opaque = opaque;
/*
* Hold a reference to the SCSIDevice until
* scsi_device_for_each_req_async_bh() finishes.
*/
object_ref(OBJECT(s));
aio_bh_schedule_oneshot(blk_get_aio_context(s->conf.blk),
scsi_device_for_each_req_async_bh,
data);
}
static void scsi_device_realize(SCSIDevice *s, Error **errp)
{
SCSIDeviceClass *sc = SCSI_DEVICE_GET_CLASS(s);
@ -144,20 +227,18 @@ void scsi_bus_init_named(SCSIBus *bus, size_t bus_size, DeviceState *host,
qbus_set_bus_hotplug_handler(BUS(bus));
}
static void scsi_dma_restart_bh(void *opaque)
void scsi_req_retry(SCSIRequest *req)
{
SCSIDevice *s = opaque;
SCSIRequest *req, *next;
req->retry = true;
}
qemu_bh_delete(s->bh);
s->bh = NULL;
aio_context_acquire(blk_get_aio_context(s->conf.blk));
QTAILQ_FOREACH_SAFE(req, &s->requests, next, next) {
scsi_req_ref(req);
if (req->retry) {
req->retry = false;
switch (req->cmd.mode) {
/* Called in the AioContext that is executing the request */
static void scsi_dma_restart_req(SCSIRequest *req, void *opaque)
{
scsi_req_ref(req);
if (req->retry) {
req->retry = false;
switch (req->cmd.mode) {
case SCSI_XFER_FROM_DEV:
case SCSI_XFER_TO_DEV:
scsi_req_continue(req);
@ -166,37 +247,22 @@ static void scsi_dma_restart_bh(void *opaque)
scsi_req_dequeue(req);
scsi_req_enqueue(req);
break;
}
}
scsi_req_unref(req);
}
aio_context_release(blk_get_aio_context(s->conf.blk));
/* Drop the reference that was acquired in scsi_dma_restart_cb */
object_unref(OBJECT(s));
}
void scsi_req_retry(SCSIRequest *req)
{
/* No need to save a reference, because scsi_dma_restart_bh just
* looks at the request list. */
req->retry = true;
scsi_req_unref(req);
}
static void scsi_dma_restart_cb(void *opaque, bool running, RunState state)
{
SCSIDevice *s = opaque;
assert(qemu_in_main_thread());
if (!running) {
return;
}
if (!s->bh) {
AioContext *ctx = blk_get_aio_context(s->conf.blk);
/* The reference is dropped in scsi_dma_restart_bh.*/
object_ref(OBJECT(s));
s->bh = aio_bh_new_guarded(ctx, scsi_dma_restart_bh, s,
&DEVICE(s)->mem_reentrancy_guard);
qemu_bh_schedule(s->bh);
}
scsi_device_for_each_req_async(s, scsi_dma_restart_req, NULL);
}
static bool scsi_bus_is_address_free(SCSIBus *bus,
@ -1657,17 +1723,16 @@ void scsi_device_set_ua(SCSIDevice *sdev, SCSISense sense)
}
}
static void scsi_device_purge_one_req(SCSIRequest *req, void *opaque)
{
scsi_req_cancel_async(req, NULL);
}
void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense)
{
SCSIRequest *req;
scsi_device_for_each_req_async(sdev, scsi_device_purge_one_req, NULL);
aio_context_acquire(blk_get_aio_context(sdev->conf.blk));
while (!QTAILQ_EMPTY(&sdev->requests)) {
req = QTAILQ_FIRST(&sdev->requests);
scsi_req_cancel_async(req, NULL);
}
blk_drain(sdev->conf.blk);
aio_context_release(blk_get_aio_context(sdev->conf.blk));
scsi_device_set_ua(sdev, sense);
}
@ -1737,31 +1802,33 @@ static char *scsibus_get_fw_dev_path(DeviceState *dev)
/* SCSI request list. For simplicity, pv points to the whole device */
static void put_scsi_req(SCSIRequest *req, void *opaque)
{
QEMUFile *f = opaque;
assert(!req->io_canceled);
assert(req->status == -1 && req->host_status == -1);
assert(req->enqueued);
qemu_put_sbyte(f, req->retry ? 1 : 2);
qemu_put_buffer(f, req->cmd.buf, sizeof(req->cmd.buf));
qemu_put_be32s(f, &req->tag);
qemu_put_be32s(f, &req->lun);
if (req->bus->info->save_request) {
req->bus->info->save_request(f, req);
}
if (req->ops->save_request) {
req->ops->save_request(f, req);
}
}
static int put_scsi_requests(QEMUFile *f, void *pv, size_t size,
const VMStateField *field, JSONWriter *vmdesc)
{
SCSIDevice *s = pv;
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, s->qdev.parent_bus);
SCSIRequest *req;
QTAILQ_FOREACH(req, &s->requests, next) {
assert(!req->io_canceled);
assert(req->status == -1 && req->host_status == -1);
assert(req->enqueued);
qemu_put_sbyte(f, req->retry ? 1 : 2);
qemu_put_buffer(f, req->cmd.buf, sizeof(req->cmd.buf));
qemu_put_be32s(f, &req->tag);
qemu_put_be32s(f, &req->lun);
if (bus->info->save_request) {
bus->info->save_request(f, req);
}
if (req->ops->save_request) {
req->ops->save_request(f, req);
}
}
scsi_device_for_each_req_sync(s, put_scsi_req, f);
qemu_put_sbyte(f, 0);
return 0;
}

67
hw/scsi/scsi-disk.c
View File

@ -273,7 +273,9 @@ static void scsi_aio_complete(void *opaque, int ret)
SCSIDiskReq *r = (SCSIDiskReq *)opaque;
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
/* The request must only run in the BlockBackend's AioContext */
assert(blk_get_aio_context(s->qdev.conf.blk) ==
qemu_get_current_aio_context());
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
@ -286,7 +288,6 @@ static void scsi_aio_complete(void *opaque, int ret)
scsi_req_complete(&r->req, GOOD);
done:
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
scsi_req_unref(&r->req);
}
@ -354,7 +355,6 @@ done:
scsi_req_unref(&r->req);
}
/* Called with AioContext lock held */
static void scsi_dma_complete(void *opaque, int ret)
{
SCSIDiskReq *r = (SCSIDiskReq *)opaque;
@ -373,8 +373,13 @@ static void scsi_dma_complete(void *opaque, int ret)
static void scsi_read_complete_noio(SCSIDiskReq *r, int ret)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
uint32_t n;
/* The request must only run in the BlockBackend's AioContext */
assert(blk_get_aio_context(s->qdev.conf.blk) ==
qemu_get_current_aio_context());
assert(r->req.aiocb == NULL);
if (scsi_disk_req_check_error(r, ret, false)) {
goto done;
@ -394,8 +399,6 @@ static void scsi_read_complete(void *opaque, int ret)
SCSIDiskReq *r = (SCSIDiskReq *)opaque;
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
@ -406,7 +409,6 @@ static void scsi_read_complete(void *opaque, int ret)
trace_scsi_disk_read_complete(r->req.tag, r->qiov.size);
}
scsi_read_complete_noio(r, ret);
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
}
/* Actually issue a read to the block device. */
@ -448,8 +450,6 @@ static void scsi_do_read_cb(void *opaque, int ret)
SCSIDiskReq *r = (SCSIDiskReq *)opaque;
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
assert (r->req.aiocb != NULL);
r->req.aiocb = NULL;
@ -459,7 +459,6 @@ static void scsi_do_read_cb(void *opaque, int ret)
block_acct_done(blk_get_stats(s->qdev.conf.blk), &r->acct);
}
scsi_do_read(opaque, ret);
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
}
/* Read more data from scsi device into buffer. */
@ -505,8 +504,13 @@ static void scsi_read_data(SCSIRequest *req)
static void scsi_write_complete_noio(SCSIDiskReq *r, int ret)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
uint32_t n;
/* The request must only run in the BlockBackend's AioContext */
assert(blk_get_aio_context(s->qdev.conf.blk) ==
qemu_get_current_aio_context());
assert (r->req.aiocb == NULL);
if (scsi_disk_req_check_error(r, ret, false)) {
goto done;
@ -533,8 +537,6 @@ static void scsi_write_complete(void * opaque, int ret)
SCSIDiskReq *r = (SCSIDiskReq *)opaque;
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
assert (r->req.aiocb != NULL);
r->req.aiocb = NULL;
@ -544,7 +546,6 @@ static void scsi_write_complete(void * opaque, int ret)
block_acct_done(blk_get_stats(s->qdev.conf.blk), &r->acct);
}
scsi_write_complete_noio(r, ret);
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
}
static void scsi_write_data(SCSIRequest *req)
@ -1742,8 +1743,6 @@ static void scsi_unmap_complete(void *opaque, int ret)
SCSIDiskReq *r = data->r;
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
@ -1754,7 +1753,6 @@ static void scsi_unmap_complete(void *opaque, int ret)
block_acct_done(blk_get_stats(s->qdev.conf.blk), &r->acct);
scsi_unmap_complete_noio(data, ret);
}
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
}
static void scsi_disk_emulate_unmap(SCSIDiskReq *r, uint8_t *inbuf)
@ -1822,8 +1820,6 @@ static void scsi_write_same_complete(void *opaque, int ret)
SCSIDiskReq *r = data->r;
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
aio_context_acquire(blk_get_aio_context(s->qdev.conf.blk));
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
@ -1847,7 +1843,6 @@ static void scsi_write_same_complete(void *opaque, int ret)
data->sector << BDRV_SECTOR_BITS,
&data->qiov, 0,
scsi_write_same_complete, data);
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
return;
}
@ -1857,7 +1852,6 @@ done:
scsi_req_unref(&r->req);
qemu_vfree(data->iov.iov_base);
g_free(data);
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
}
static void scsi_disk_emulate_write_same(SCSIDiskReq *r, uint8_t *inbuf)
@ -2344,14 +2338,10 @@ static void scsi_disk_reset(DeviceState *dev)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev.qdev, dev);
uint64_t nb_sectors;
AioContext *ctx;
scsi_device_purge_requests(&s->qdev, SENSE_CODE(RESET));
ctx = blk_get_aio_context(s->qdev.conf.blk);
aio_context_acquire(ctx);
blk_get_geometry(s->qdev.conf.blk, &nb_sectors);
aio_context_release(ctx);
nb_sectors /= s->qdev.blocksize / BDRV_SECTOR_SIZE;
if (nb_sectors) {
@ -2550,15 +2540,13 @@ static void scsi_unrealize(SCSIDevice *dev)
static void scsi_hd_realize(SCSIDevice *dev, Error **errp)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
AioContext *ctx = NULL;
/* can happen for devices without drive. The error message for missing
* backend will be issued in scsi_realize
*/
if (s->qdev.conf.blk) {
ctx = blk_get_aio_context(s->qdev.conf.blk);
aio_context_acquire(ctx);
if (!blkconf_blocksizes(&s->qdev.conf, errp)) {
goto out;
return;
}
}
s->qdev.blocksize = s->qdev.conf.logical_block_size;
@ -2567,16 +2555,11 @@ static void scsi_hd_realize(SCSIDevice *dev, Error **errp)
s->product = g_strdup("QEMU HARDDISK");
}
scsi_realize(&s->qdev, errp);
out:
if (ctx) {
aio_context_release(ctx);
}
}
static void scsi_cd_realize(SCSIDevice *dev, Error **errp)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
AioContext *ctx;
int ret;
uint32_t blocksize = 2048;
@ -2592,8 +2575,6 @@ static void scsi_cd_realize(SCSIDevice *dev, Error **errp)
blocksize = dev->conf.physical_block_size;
}
ctx = blk_get_aio_context(dev->conf.blk);
aio_context_acquire(ctx);
s->qdev.blocksize = blocksize;
s->qdev.type = TYPE_ROM;
s->features |= 1 << SCSI_DISK_F_REMOVABLE;
@ -2601,7 +2582,6 @@ static void scsi_cd_realize(SCSIDevice *dev, Error **errp)
s->product = g_strdup("QEMU CD-ROM");
}
scsi_realize(&s->qdev, errp);
aio_context_release(ctx);
}
@ -2732,7 +2712,6 @@ static int get_device_type(SCSIDiskState *s)
static void scsi_block_realize(SCSIDevice *dev, Error **errp)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
AioContext *ctx;
int sg_version;
int rc;
@ -2747,9 +2726,6 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp)
"be removed in a future version");
}
ctx = blk_get_aio_context(s->qdev.conf.blk);
aio_context_acquire(ctx);
/* check we are using a driver managing SG_IO (version 3 and after) */
rc = blk_ioctl(s->qdev.conf.blk, SG_GET_VERSION_NUM, &sg_version);
if (rc < 0) {
@ -2757,18 +2733,18 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp)
if (rc != -EPERM) {
error_append_hint(errp, "Is this a SCSI device?\n");
}
goto out;
return;
}
if (sg_version < 30000) {
error_setg(errp, "scsi generic interface too old");
goto out;
return;
}
/* get device type from INQUIRY data */
rc = get_device_type(s);
if (rc < 0) {
error_setg(errp, "INQUIRY failed");
goto out;
return;
}
/* Make a guess for the block size, we'll fix it when the guest sends.
@ -2788,9 +2764,6 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp)
scsi_realize(&s->qdev, errp);
scsi_generic_read_device_inquiry(&s->qdev);
out:
aio_context_release(ctx);
}
typedef struct SCSIBlockReq {
@ -2810,7 +2783,6 @@ static void scsi_block_sgio_complete(void *opaque, int ret)
{
SCSIBlockReq *req = (SCSIBlockReq *)opaque;
SCSIDiskReq *r = &req->req;
SCSIDevice *s = r->req.dev;
sg_io_hdr_t *io_hdr = &req->io_header;
if (ret == 0) {
@ -2827,13 +2799,10 @@ static void scsi_block_sgio_complete(void *opaque, int ret)
}
if (ret > 0) {
aio_context_acquire(blk_get_aio_context(s->conf.blk));
if (scsi_handle_rw_error(r, ret, true)) {
aio_context_release(blk_get_aio_context(s->conf.blk));
scsi_req_unref(&r->req);
return;
}
aio_context_release(blk_get_aio_context(s->conf.blk));
/* Ignore error. */
ret = 0;

20
hw/scsi/scsi-generic.c
View File

@ -109,15 +109,11 @@ done:
static void scsi_command_complete(void *opaque, int ret)
{
SCSIGenericReq *r = (SCSIGenericReq *)opaque;
SCSIDevice *s = r->req.dev;
aio_context_acquire(blk_get_aio_context(s->conf.blk));
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
scsi_command_complete_noio(r, ret);
aio_context_release(blk_get_aio_context(s->conf.blk));
}
static int execute_command(BlockBackend *blk,
@ -274,14 +270,12 @@ static void scsi_read_complete(void * opaque, int ret)
SCSIDevice *s = r->req.dev;
int len;
aio_context_acquire(blk_get_aio_context(s->conf.blk));
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
if (ret || r->req.io_canceled) {
scsi_command_complete_noio(r, ret);
goto done;
return;
}
len = r->io_header.dxfer_len - r->io_header.resid;
@ -320,7 +314,7 @@ static void scsi_read_complete(void * opaque, int ret)
r->io_header.status != GOOD ||
len == 0) {
scsi_command_complete_noio(r, 0);
goto done;
return;
}
/* Snoop READ CAPACITY output to set the blocksize. */
@ -356,9 +350,6 @@ static void scsi_read_complete(void * opaque, int ret)
req_complete:
scsi_req_data(&r->req, len);
scsi_req_unref(&r->req);
done:
aio_context_release(blk_get_aio_context(s->conf.blk));
}
/* Read more data from scsi device into buffer. */
@ -391,14 +382,12 @@ static void scsi_write_complete(void * opaque, int ret)
trace_scsi_generic_write_complete(ret);
aio_context_acquire(blk_get_aio_context(s->conf.blk));
assert(r->req.aiocb != NULL);
r->req.aiocb = NULL;
if (ret || r->req.io_canceled) {
scsi_command_complete_noio(r, ret);
goto done;
return;
}
if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 &&
@ -408,9 +397,6 @@ static void scsi_write_complete(void * opaque, int ret)
}
scsi_command_complete_noio(r, ret);
done:
aio_context_release(blk_get_aio_context(s->conf.blk));
}
/* Write data to a scsi device. Returns nonzero on failure.

8
hw/scsi/virtio-scsi-dataplane.c
View File

@ -149,23 +149,17 @@ int virtio_scsi_dataplane_start(VirtIODevice *vdev)
memory_region_transaction_commit();
/*
* These fields are visible to the IOThread so we rely on implicit barriers
* in aio_context_acquire() on the write side and aio_notify_accept() on
* the read side.
*/
s->dataplane_starting = false;
s->dataplane_started = true;
smp_wmb(); /* paired with aio_notify_accept() */
if (s->bus.drain_count == 0) {
aio_context_acquire(s->ctx);
virtio_queue_aio_attach_host_notifier(vs->ctrl_vq, s->ctx);
virtio_queue_aio_attach_host_notifier_no_poll(vs->event_vq, s->ctx);
for (i = 0; i < vs->conf.num_queues; i++) {
virtio_queue_aio_attach_host_notifier(vs->cmd_vqs[i], s->ctx);
}
aio_context_release(s->ctx);
}
return 0;

80
hw/scsi/virtio-scsi.c
View File

@ -123,6 +123,30 @@ static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
virtio_scsi_free_req(req);
}
static void virtio_scsi_complete_req_bh(void *opaque)
{
VirtIOSCSIReq *req = opaque;
virtio_scsi_complete_req(req);
}
/*
* Called from virtio_scsi_do_one_tmf_bh() in main loop thread. The main loop
* thread cannot touch the virtqueue since that could race with an IOThread.
*/
static void virtio_scsi_complete_req_from_main_loop(VirtIOSCSIReq *req)
{
VirtIOSCSI *s = req->dev;
if (!s->ctx || s->ctx == qemu_get_aio_context()) {
/* No need to schedule a BH when there is no IOThread */
virtio_scsi_complete_req(req);
} else {
/* Run request completion in the IOThread */
aio_wait_bh_oneshot(s->ctx, virtio_scsi_complete_req_bh, req);
}
}
static void virtio_scsi_bad_req(VirtIOSCSIReq *req)
{
virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers");
@ -338,10 +362,7 @@ static void virtio_scsi_do_one_tmf_bh(VirtIOSCSIReq *req)
out:
object_unref(OBJECT(d));
virtio_scsi_acquire(s);
virtio_scsi_complete_req(req);
virtio_scsi_release(s);
virtio_scsi_complete_req_from_main_loop(req);
}
/* Some TMFs must be processed from the main loop thread */
@ -354,18 +375,16 @@ static void virtio_scsi_do_tmf_bh(void *opaque)
GLOBAL_STATE_CODE();
virtio_scsi_acquire(s);
WITH_QEMU_LOCK_GUARD(&s->tmf_bh_lock) {
QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) {
QTAILQ_REMOVE(&s->tmf_bh_list, req, next);
QTAILQ_INSERT_TAIL(&reqs, req, next);
}
QTAILQ_FOREACH_SAFE(req, &s->tmf_bh_list, next, tmp) {
QTAILQ_REMOVE(&s->tmf_bh_list, req, next);
QTAILQ_INSERT_TAIL(&reqs, req, next);
qemu_bh_delete(s->tmf_bh);
s->tmf_bh = NULL;
}
qemu_bh_delete(s->tmf_bh);
s->tmf_bh = NULL;
virtio_scsi_release(s);
QTAILQ_FOREACH_SAFE(req, &reqs, next, tmp) {
QTAILQ_REMOVE(&reqs, req, next);
virtio_scsi_do_one_tmf_bh(req);
@ -379,8 +398,7 @@ static void virtio_scsi_reset_tmf_bh(VirtIOSCSI *s)
GLOBAL_STATE_CODE();
virtio_scsi_acquire(s);
/* Called after ioeventfd has been stopped, so tmf_bh_lock is not needed */
if (s->tmf_bh) {
qemu_bh_delete(s->tmf_bh);
s->tmf_bh = NULL;
@ -393,19 +411,19 @@ static void virtio_scsi_reset_tmf_bh(VirtIOSCSI *s)
req->resp.tmf.response = VIRTIO_SCSI_S_TARGET_FAILURE;
virtio_scsi_complete_req(req);
}
virtio_scsi_release(s);
}
static void virtio_scsi_defer_tmf_to_bh(VirtIOSCSIReq *req)
{
VirtIOSCSI *s = req->dev;
QTAILQ_INSERT_TAIL(&s->tmf_bh_list, req, next);
WITH_QEMU_LOCK_GUARD(&s->tmf_bh_lock) {
QTAILQ_INSERT_TAIL(&s->tmf_bh_list, req, next);
if (!s->tmf_bh) {
s->tmf_bh = qemu_bh_new(virtio_scsi_do_tmf_bh, s);
qemu_bh_schedule(s->tmf_bh);
if (!s->tmf_bh) {
s->tmf_bh = qemu_bh_new(virtio_scsi_do_tmf_bh, s);
qemu_bh_schedule(s->tmf_bh);
}
}
}
@ -624,9 +642,7 @@ static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
return;
}
virtio_scsi_acquire(s);
virtio_scsi_handle_ctrl_vq(s, vq);
virtio_scsi_release(s);
}
static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req)
@ -864,9 +880,7 @@ static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
return;
}
virtio_scsi_acquire(s);
virtio_scsi_handle_cmd_vq(s, vq);
virtio_scsi_release(s);
}
static void virtio_scsi_get_config(VirtIODevice *vdev,
@ -1013,9 +1027,7 @@ static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
return;
}
virtio_scsi_acquire(s);
virtio_scsi_handle_event_vq(s, vq);
virtio_scsi_release(s);
}
static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
@ -1034,9 +1046,7 @@ static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
},
};
virtio_scsi_acquire(s);
virtio_scsi_push_event(s, &info);
virtio_scsi_release(s);
}
}
@ -1053,17 +1063,13 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
SCSIDevice *sd = SCSI_DEVICE(dev);
AioContext *old_context;
int ret;
if (s->ctx && !s->dataplane_fenced) {
if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
return;
}
old_context = blk_get_aio_context(sd->conf.blk);
aio_context_acquire(old_context);
ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp);
aio_context_release(old_context);
if (ret < 0) {
return;
}
@ -1079,10 +1085,8 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
},
};
virtio_scsi_acquire(s);
virtio_scsi_push_event(s, &info);
scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
virtio_scsi_release(s);
}
}
@ -1104,17 +1108,13 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
if (s->ctx) {
virtio_scsi_acquire(s);
/* If other users keep the BlockBackend in the iothread, that's ok */
blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL);
virtio_scsi_release(s);
}
if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
virtio_scsi_acquire(s);
virtio_scsi_push_event(s, &info);
scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
virtio_scsi_release(s);
}
}
@ -1235,6 +1235,7 @@ static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
Error *err = NULL;
QTAILQ_INIT(&s->tmf_bh_list);
qemu_mutex_init(&s->tmf_bh_lock);
virtio_scsi_common_realize(dev,
virtio_scsi_handle_ctrl,
@ -1277,6 +1278,7 @@ static void virtio_scsi_device_unrealize(DeviceState *dev)
qbus_set_hotplug_handler(BUS(&s->bus), NULL);
virtio_scsi_common_unrealize(dev);
qemu_mutex_destroy(&s->tmf_bh_lock);
}
static Property virtio_scsi_properties[] = {

16
include/block/aio-wait.h
View File

@ -63,9 +63,6 @@ extern AioWait global_aio_wait;
* @ctx: the aio context, or NULL if multiple aio contexts (for which the
* caller does not hold a lock) are involved in the polling condition.
* @cond: wait while this conditional expression is true
* @unlock: whether to unlock and then lock again @ctx. This applies
* only when waiting for another AioContext from the main loop.
* Otherwise it's ignored.
*
* Wait while a condition is true. Use this to implement synchronous
* operations that require event loop activity.
@ -78,7 +75,7 @@ extern AioWait global_aio_wait;
* wait on conditions between two IOThreads since that could lead to deadlock,
* go via the main loop instead.
*/
#define AIO_WAIT_WHILE_INTERNAL(ctx, cond, unlock) ({ \
#define AIO_WAIT_WHILE_INTERNAL(ctx, cond) ({ \
bool waited_ = false; \
AioWait *wait_ = &global_aio_wait; \
AioContext *ctx_ = (ctx); \
@ -95,13 +92,7 @@ extern AioWait global_aio_wait;
assert(qemu_get_current_aio_context() == \
qemu_get_aio_context()); \
while ((cond)) { \
if (unlock && ctx_) { \
aio_context_release(ctx_); \
} \
aio_poll(qemu_get_aio_context(), true); \
if (unlock && ctx_) { \
aio_context_acquire(ctx_); \
} \
waited_ = true; \
} \
} \
@ -109,10 +100,11 @@ extern AioWait global_aio_wait;
waited_; })
#define AIO_WAIT_WHILE(ctx, cond) \
AIO_WAIT_WHILE_INTERNAL(ctx, cond, true)
AIO_WAIT_WHILE_INTERNAL(ctx, cond)
/* TODO replace this with AIO_WAIT_WHILE() in a future patch */
#define AIO_WAIT_WHILE_UNLOCKED(ctx, cond) \
AIO_WAIT_WHILE_INTERNAL(ctx, cond, false)
AIO_WAIT_WHILE_INTERNAL(ctx, cond)
/**
* aio_wait_kick:

17
include/block/aio.h
View File

@ -278,23 +278,6 @@ void aio_context_ref(AioContext *ctx);
*/
void aio_context_unref(AioContext *ctx);
/* Take ownership of the AioContext. If the AioContext will be shared between
* threads, and a thread does not want to be interrupted, it will have to
* take ownership around calls to aio_poll(). Otherwise, aio_poll()
* automatically takes care of calling aio_context_acquire and
* aio_context_release.
*
* Note that this is separate from bdrv_drained_begin/bdrv_drained_end. A
* thread still has to call those to avoid being interrupted by the guest.
*
* Bottom halves, timers and callbacks can be created or removed without
* acquiring the AioContext.
*/
void aio_context_acquire(AioContext *ctx);
/* Relinquish ownership of the AioContext. */
void aio_context_release(AioContext *ctx);
/**
* aio_bh_schedule_oneshot_full: Allocate a new bottom half structure that will
* run only once and as soon as possible.

3
include/block/block-common.h
View File

@ -70,9 +70,6 @@
* automatically takes the graph rdlock when calling the wrapped function. In
* the same way, no_co_wrapper_bdrv_wrlock functions automatically take the
* graph wrlock.
*
* If the first parameter of the function is a BlockDriverState, BdrvChild or
* BlockBackend pointer, the AioContext lock for it is taken in the wrapper.
*/
#define no_co_wrapper
#define no_co_wrapper_bdrv_rdlock

23
include/block/block-global-state.h
View File

@ -31,11 +31,10 @@
/*
* Global state (GS) API. These functions run under the BQL.
*
* If a function modifies the graph, it also uses drain and/or
* aio_context_acquire/release to be sure it has unique access.
* aio_context locking is needed together with BQL because of
* the thread-safe I/O API that concurrently runs and accesses
* the graph without the BQL.
* If a function modifies the graph, it also uses the graph lock to be sure it
* has unique access. The graph lock is needed together with BQL because of the
* thread-safe I/O API that concurrently runs and accesses the graph without
* the BQL.
*
* It is important to note that not all of these functions are
* necessarily limited to running under the BQL, but they would
@ -268,20 +267,6 @@ int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
/**
* Locks the AioContext of @bs if it's not the current AioContext. This avoids
* double locking which could lead to deadlocks: This is a coroutine_fn, so we
* know we already own the lock of the current AioContext.
*
* May only be called in the main thread.
*/
void coroutine_fn bdrv_co_lock(BlockDriverState *bs);
/**
* Unlocks the AioContext of @bs if it's not the current AioContext.
*/
void coroutine_fn bdrv_co_unlock(BlockDriverState *bs);
bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx,
GHashTable *visited, Transaction *tran,
Error **errp);

12
include/block/block-io.h
View File

@ -31,8 +31,7 @@
/*
* I/O API functions. These functions are thread-safe, and therefore
* can run in any thread as long as the thread has called
* aio_context_acquire/release().
* can run in any thread.
*
* These functions can only call functions from I/O and Common categories,
* but can be invoked by GS, "I/O or GS" and I/O APIs.
@ -333,11 +332,10 @@ bdrv_co_copy_range(BdrvChild *src, int64_t src_offset,
* "I/O or GS" API functions. These functions can run without
* the BQL, but only in one specific iothread/main loop.
*
* More specifically, these functions use BDRV_POLL_WHILE(bs), which
* requires the caller to be either in the main thread and hold
* the BlockdriverState (bs) AioContext lock, or directly in the
* home thread that runs the bs AioContext. Calling them from
* another thread in another AioContext would cause deadlocks.
* More specifically, these functions use BDRV_POLL_WHILE(bs), which requires
* the caller to be either in the main thread or directly in the home thread
* that runs the bs AioContext. Calling them from another thread in another
* AioContext would cause deadlocks.
*
* Therefore, these functions are not proper I/O, because they
* can't run in *any* iothreads, but only in a specific one.

2
include/block/block_int-common.h
View File

@ -1192,8 +1192,6 @@ struct BlockDriverState {
/* The error object in use for blocking operations on backing_hd */
Error *backing_blocker;
/* Protected by AioContext lock */
/*
* If we are reading a disk image, give its size in sectors.
* Generally read-only; it is written to by load_snapshot and

21
include/block/graph-lock.h
View File

@ -110,34 +110,17 @@ void unregister_aiocontext(AioContext *ctx);
*
* The wrlock can only be taken from the main loop, with BQL held, as only the
* main loop is allowed to modify the graph.
*
* If @bs is non-NULL, its AioContext is temporarily released.
*
* This function polls. Callers must not hold the lock of any AioContext other
* than the current one and the one of @bs.
*/
void no_coroutine_fn TSA_ACQUIRE(graph_lock) TSA_NO_TSA
bdrv_graph_wrlock(BlockDriverState *bs);
bdrv_graph_wrlock(void);
/*
* bdrv_graph_wrunlock:
* Write finished, reset global has_writer to 0 and restart
* all readers that are waiting.
*
* If @bs is non-NULL, its AioContext is temporarily released.
*/
void no_coroutine_fn TSA_RELEASE(graph_lock) TSA_NO_TSA
bdrv_graph_wrunlock(BlockDriverState *bs);
/*
* bdrv_graph_wrunlock_ctx:
* Write finished, reset global has_writer to 0 and restart
* all readers that are waiting.
*
* If @ctx is non-NULL, its lock is temporarily released.
*/
void no_coroutine_fn TSA_RELEASE(graph_lock) TSA_NO_TSA
bdrv_graph_wrunlock_ctx(AioContext *ctx);
bdrv_graph_wrunlock(void);
/*
* bdrv_graph_co_rdlock:

2
include/block/snapshot.h
View File

@ -86,8 +86,6 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
/*
* Group operations. All block drivers are involved.
* These functions will properly handle dataplane (take aio_context_acquire
* when appropriate for appropriate block drivers
*/
bool bdrv_all_can_snapshot(bool has_devices, strList *devices,

5
include/hw/qdev-properties-system.h
View File

@ -24,6 +24,7 @@ extern const PropertyInfo qdev_prop_off_auto_pcibar;
extern const PropertyInfo qdev_prop_pcie_link_speed;
extern const PropertyInfo qdev_prop_pcie_link_width;
extern const PropertyInfo qdev_prop_cpus390entitlement;
extern const PropertyInfo qdev_prop_iothread_vq_mapping_list;
#define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \
DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_pci_devfn, int32_t)
@ -82,4 +83,8 @@ extern const PropertyInfo qdev_prop_cpus390entitlement;
DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_cpus390entitlement, \
CpuS390Entitlement)
#define DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST(_name, _state, _field) \
DEFINE_PROP(_name, _state, _field, qdev_prop_iothread_vq_mapping_list, \
IOThreadVirtQueueMappingList *)
#endif

4
include/hw/qdev-properties.h
View File

@ -230,8 +230,8 @@ void qdev_property_add_static(DeviceState *dev, Property *prop);
* @target: Device which has properties to be aliased
* @source: Object to add alias properties to
*
* Add alias properties to the @source object for all qdev properties on
* the @target DeviceState.
* Add alias properties to the @source object for all properties on the @target
* DeviceState.
*
* This is useful when @target is an internal implementation object
* owned by @source, and you want to expose all the properties of that

7
include/hw/scsi/scsi.h
View File

@ -69,14 +69,19 @@ struct SCSIDevice
{
DeviceState qdev;
VMChangeStateEntry *vmsentry;
QEMUBH *bh;
uint32_t id;
BlockConf conf;
SCSISense unit_attention;
bool sense_is_ua;
uint8_t sense[SCSI_SENSE_BUF_SIZE];
uint32_t sense_len;
/*
* The requests list is only accessed from the AioContext that executes
* requests or from the main loop when IOThread processing is stopped.
*/
QTAILQ_HEAD(, SCSIRequest) requests;
uint32_t channel;
uint32_t lun;
int blocksize;

5
include/hw/virtio/virtio-blk.h
View File

@ -21,6 +21,7 @@
#include "sysemu/block-backend.h"
#include "sysemu/block-ram-registrar.h"
#include "qom/object.h"
#include "qapi/qapi-types-virtio.h"
#define TYPE_VIRTIO_BLK "virtio-blk-device"
OBJECT_DECLARE_SIMPLE_TYPE(VirtIOBlock, VIRTIO_BLK)
@ -37,6 +38,7 @@ struct VirtIOBlkConf
{
BlockConf conf;
IOThread *iothread;
IOThreadVirtQueueMappingList *iothread_vq_mapping_list;
char *serial;
uint32_t request_merging;
uint16_t num_queues;
@ -54,7 +56,8 @@ struct VirtIOBlockReq;
struct VirtIOBlock {
VirtIODevice parent_obj;
BlockBackend *blk;
void *rq;
QemuMutex rq_lock;
void *rq; /* protected by rq_lock */
VirtIOBlkConf conf;
unsigned short sector_mask;
bool original_wce;

17
include/hw/virtio/virtio-scsi.h
View File

@ -85,8 +85,9 @@ struct VirtIOSCSI {
/*
* TMFs deferred to main loop BH. These fields are protected by
* virtio_scsi_acquire().
* tmf_bh_lock.
*/
QemuMutex tmf_bh_lock;
QEMUBH *tmf_bh;
QTAILQ_HEAD(, VirtIOSCSIReq) tmf_bh_list;
@ -100,20 +101,6 @@ struct VirtIOSCSI {
uint32_t host_features;
};
static inline void virtio_scsi_acquire(VirtIOSCSI *s)
{
if (s->ctx) {
aio_context_acquire(s->ctx);
}
}
static inline void virtio_scsi_release(VirtIOSCSI *s)
{
if (s->ctx) {
aio_context_release(s->ctx);
}
}
void virtio_scsi_common_realize(DeviceState *dev,
VirtIOHandleOutput ctrl,
VirtIOHandleOutput evt,

6
include/qapi/string-output-visitor.h
View File

@ -26,9 +26,9 @@ typedef struct StringOutputVisitor StringOutputVisitor;
* If everything else succeeds, pass @result to visit_complete() to
* collect the result of the visit.
*
* The string output visitor does not implement support for visiting
* QAPI structs, alternates, null, or arbitrary QTypes. It also
* requires a non-null list argument to visit_start_list().
* The string output visitor does not implement support for alternates, null,
* or arbitrary QTypes. Struct fields are not shown. It also requires a
* non-null list argument to visit_start_list().
*/
Visitor *string_output_visitor_new(bool human, char **result);

20
include/qemu/job.h
View File

@ -67,8 +67,6 @@ typedef struct Job {
/**
* The completion function that will be called when the job completes.
* Called with AioContext lock held, since many callback implementations
* use bdrv_* functions that require to hold the lock.
*/
BlockCompletionFunc *cb;
@ -264,9 +262,6 @@ struct JobDriver {
*
* This callback will not be invoked if the job has already failed.
* If it fails, abort and then clean will be called.
*
* Called with AioContext lock held, since many callbacs implementations
* use bdrv_* functions that require to hold the lock.
*/
int (*prepare)(Job *job);
@ -277,9 +272,6 @@ struct JobDriver {
*
* All jobs will complete with a call to either .commit() or .abort() but
* never both.
*
* Called with AioContext lock held, since many callback implementations
* use bdrv_* functions that require to hold the lock.
*/
void (*commit)(Job *job);
@ -290,9 +282,6 @@ struct JobDriver {
*
* All jobs will complete with a call to either .commit() or .abort() but
* never both.
*
* Called with AioContext lock held, since many callback implementations
* use bdrv_* functions that require to hold the lock.
*/
void (*abort)(Job *job);
@ -301,9 +290,6 @@ struct JobDriver {
* .commit() or .abort(). Regardless of which callback is invoked after
* completion, .clean() will always be called, even if the job does not
* belong to a transaction group.
*
* Called with AioContext lock held, since many callbacs implementations
* use bdrv_* functions that require to hold the lock.
*/
void (*clean)(Job *job);
@ -318,17 +304,12 @@ struct JobDriver {
* READY).
* (If the callback is NULL, the job is assumed to terminate
* without I/O.)
*
* Called with AioContext lock held, since many callback implementations
* use bdrv_* functions that require to hold the lock.
*/
bool (*cancel)(Job *job, bool force);
/**
* Called when the job is freed.
* Called with AioContext lock held, since many callback implementations
* use bdrv_* functions that require to hold the lock.
*/
void (*free)(Job *job);
};
@ -424,7 +405,6 @@ void job_ref_locked(Job *job);
* Release a reference that was previously acquired with job_ref_locked() or
* job_create(). If it's the last reference to the object, it will be freed.
*
* Takes AioContext lock internally to invoke a job->driver callback.
* Called with job lock held.
*/
void job_unref_locked(Job *job);

16
job.c
View File

@ -464,12 +464,8 @@ void job_unref_locked(Job *job)
assert(!job->txn);
if (job->driver->free) {
AioContext *aio_context = job->aio_context;
job_unlock();
/* FIXME: aiocontext lock is required because cb calls blk_unref */
aio_context_acquire(aio_context);
job->driver->free(job);
aio_context_release(aio_context);
job_lock();
}
@ -840,12 +836,10 @@ static void job_clean(Job *job)
/*
* Called with job_mutex held, but releases it temporarily.
* Takes AioContext lock internally to invoke a job->driver callback.
*/
static int job_finalize_single_locked(Job *job)
{
int job_ret;
AioContext *ctx = job->aio_context;
assert(job_is_completed_locked(job));
@ -854,7 +848,6 @@ static int job_finalize_single_locked(Job *job)
job_ret = job->ret;
job_unlock();
aio_context_acquire(ctx);
if (!job_ret) {
job_commit(job);
@ -867,7 +860,6 @@ static int job_finalize_single_locked(Job *job)
job->cb(job->opaque, job_ret);
}
aio_context_release(ctx);
job_lock();
/* Emit events only if we actually started */
@ -886,17 +878,13 @@ static int job_finalize_single_locked(Job *job)
/*
* Called with job_mutex held, but releases it temporarily.
* Takes AioContext lock internally to invoke a job->driver callback.
*/
static void job_cancel_async_locked(Job *job, bool force)
{
AioContext *ctx = job->aio_context;
GLOBAL_STATE_CODE();
if (job->driver->cancel) {
job_unlock();
aio_context_acquire(ctx);
force = job->driver->cancel(job, force);
aio_context_release(ctx);
job_lock();
} else {
/* No .cancel() means the job will behave as if force-cancelled */
@ -931,7 +919,6 @@ static void job_cancel_async_locked(Job *job, bool force)
/*
* Called with job_mutex held, but releases it temporarily.
* Takes AioContext lock internally to invoke a job->driver callback.
*/
static void job_completed_txn_abort_locked(Job *job)
{
@ -979,15 +966,12 @@ static void job_completed_txn_abort_locked(Job *job)
static int job_prepare_locked(Job *job)
{
int ret;
AioContext *ctx = job->aio_context;
GLOBAL_STATE_CODE();
if (job->ret == 0 && job->driver->prepare) {
job_unlock();
aio_context_acquire(ctx);
ret = job->driver->prepare(job);
aio_context_release(ctx);
job_lock();
job->ret = ret;
job_update_rc_locked(job);

34
migration/block.c
View File

@ -66,7 +66,7 @@ typedef struct BlkMigDevState {
/* Protected by block migration lock. */
int64_t completed_sectors;
/* During migration this is protected by iothread lock / AioContext.
/* During migration this is protected by bdrv_dirty_bitmap_lock().
* Allocation and free happen during setup and cleanup respectively.
*/
BdrvDirtyBitmap *dirty_bitmap;
@ -101,7 +101,7 @@ typedef struct BlkMigState {
int prev_progress;
int bulk_completed;
/* Lock must be taken _inside_ the iothread lock and any AioContexts. */
/* Lock must be taken _inside_ the iothread lock. */
QemuMutex lock;
} BlkMigState;
@ -270,7 +270,6 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
if (bmds->shared_base) {
qemu_mutex_lock_iothread();
aio_context_acquire(blk_get_aio_context(bb));
/* Skip unallocated sectors; intentionally treats failure or
* partial sector as an allocated sector */
while (cur_sector < total_sectors &&
@ -281,7 +280,6 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
}
cur_sector += count >> BDRV_SECTOR_BITS;
}
aio_context_release(blk_get_aio_context(bb));
qemu_mutex_unlock_iothread();
}
@ -313,21 +311,16 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
block_mig_state.submitted++;
blk_mig_unlock();
/* We do not know if bs is under the main thread (and thus does
* not acquire the AioContext when doing AIO) or rather under
* dataplane. Thus acquire both the iothread mutex and the
* AioContext.
*
* This is ugly and will disappear when we make bdrv_* thread-safe,
* without the need to acquire the AioContext.
/*
* The migration thread does not have an AioContext. Lock the BQL so that
* I/O runs in the main loop AioContext (see
* qemu_get_current_aio_context()).
*/
qemu_mutex_lock_iothread();
aio_context_acquire(blk_get_aio_context(bmds->blk));
bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE,
nr_sectors * BDRV_SECTOR_SIZE);
blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
0, blk_mig_read_cb, blk);
aio_context_release(blk_get_aio_context(bmds->blk));
qemu_mutex_unlock_iothread();
bmds->cur_sector = cur_sector + nr_sectors;
@ -512,7 +505,7 @@ static void blk_mig_reset_dirty_cursor(void)
}
}
/* Called with iothread lock and AioContext taken. */
/* Called with iothread lock taken. */
static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
int is_async)
@ -606,9 +599,7 @@ static int blk_mig_save_dirty_block(QEMUFile *f, int is_async)
int ret = 1;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
aio_context_acquire(blk_get_aio_context(bmds->blk));
ret = mig_save_device_dirty(f, bmds, is_async);
aio_context_release(blk_get_aio_context(bmds->blk));
if (ret <= 0) {
break;
}
@ -666,9 +657,9 @@ static int64_t get_remaining_dirty(void)
int64_t dirty = 0;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
aio_context_acquire(blk_get_aio_context(bmds->blk));
bdrv_dirty_bitmap_lock(bmds->dirty_bitmap);
dirty += bdrv_get_dirty_count(bmds->dirty_bitmap);
aio_context_release(blk_get_aio_context(bmds->blk));
bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
}
return dirty;
@ -681,7 +672,6 @@ static void block_migration_cleanup_bmds(void)
{
BlkMigDevState *bmds;
BlockDriverState *bs;
AioContext *ctx;
unset_dirty_tracking();
@ -693,13 +683,7 @@ static void block_migration_cleanup_bmds(void)
bdrv_op_unblock_all(bs, bmds->blocker);
}
error_free(bmds->blocker);
/* Save ctx, because bmds->blk can disappear during blk_unref. */
ctx = blk_get_aio_context(bmds->blk);
aio_context_acquire(ctx);
blk_unref(bmds->blk);
aio_context_release(ctx);
g_free(bmds->blk_name);
g_free(bmds->aio_bitmap);
g_free(bmds);

3
migration/migration-hmp-cmds.c
View File

@ -852,14 +852,11 @@ static void vm_completion(ReadLineState *rs, const char *str)
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
SnapshotInfoList *snapshots, *snapshot;
AioContext *ctx = bdrv_get_aio_context(bs);
bool ok = false;
aio_context_acquire(ctx);
if (bdrv_can_snapshot(bs)) {
ok = bdrv_query_snapshot_info_list(bs, &snapshots, NULL) == 0;
}
aio_context_release(ctx);
if (!ok) {
continue;
}

22
migration/savevm.c
View File

@ -3049,7 +3049,6 @@ bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
int saved_vm_running;
uint64_t vm_state_size;
g_autoptr(GDateTime) now = g_date_time_new_now_local();
AioContext *aio_context;
GLOBAL_STATE_CODE();
@ -3092,7 +3091,6 @@ bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
if (bs == NULL) {
return false;
}
aio_context = bdrv_get_aio_context(bs);
saved_vm_running = runstate_is_running();
@ -3101,8 +3099,6 @@ bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
bdrv_drain_all_begin();
aio_context_acquire(aio_context);
memset(sn, 0, sizeof(*sn));
/* fill auxiliary fields */
@ -3139,14 +3135,6 @@ bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
goto the_end;
}
/* The bdrv_all_create_snapshot() call that follows acquires the AioContext
* for itself. BDRV_POLL_WHILE() does not support nested locking because
* it only releases the lock once. Therefore synchronous I/O will deadlock
* unless we release the AioContext before bdrv_all_create_snapshot().
*/
aio_context_release(aio_context);
aio_context = NULL;
ret = bdrv_all_create_snapshot(sn, bs, vm_state_size,
has_devices, devices, errp);
if (ret < 0) {
@ -3157,10 +3145,6 @@ bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
ret = 0;
the_end:
if (aio_context) {
aio_context_release(aio_context);
}
bdrv_drain_all_end();
if (saved_vm_running) {
@ -3258,7 +3242,6 @@ bool load_snapshot(const char *name, const char *vmstate,
QEMUSnapshotInfo sn;
QEMUFile *f;
int ret;
AioContext *aio_context;
MigrationIncomingState *mis = migration_incoming_get_current();
if (!bdrv_all_can_snapshot(has_devices, devices, errp)) {
@ -3278,12 +3261,9 @@ bool load_snapshot(const char *name, const char *vmstate,
if (!bs_vm_state) {
return false;
}
aio_context = bdrv_get_aio_context(bs_vm_state);
/* Don't even try to load empty VM states */
aio_context_acquire(aio_context);
ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
aio_context_release(aio_context);
if (ret < 0) {
return false;
} else if (sn.vm_state_size == 0) {
@ -3320,10 +3300,8 @@ bool load_snapshot(const char *name, const char *vmstate,
ret = -EINVAL;
goto err_drain;
}
aio_context_acquire(aio_context);
ret = qemu_loadvm_state(f);
migration_incoming_state_destroy();
aio_context_release(aio_context);
bdrv_drain_all_end();

210
nbd/server.c
View File

@ -122,26 +122,28 @@ struct NBDMetaContexts {
};
struct NBDClient {
int refcount;
int refcount; /* atomic */
void (*close_fn)(NBDClient *client, bool negotiated);
QemuMutex lock;
NBDExport *exp;
QCryptoTLSCreds *tlscreds;
char *tlsauthz;
QIOChannelSocket *sioc; /* The underlying data channel */
QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
Coroutine *recv_coroutine;
Coroutine *recv_coroutine; /* protected by lock */
CoMutex send_lock;
Coroutine *send_coroutine;
bool read_yielding;
bool quiescing;
bool read_yielding; /* protected by lock */
bool quiescing; /* protected by lock */
QTAILQ_ENTRY(NBDClient) next;
int nb_requests;
bool closing;
int nb_requests; /* protected by lock */
bool closing; /* protected by lock */
uint32_t check_align; /* If non-zero, check for aligned client requests */
@ -1415,11 +1417,18 @@ nbd_read_eof(NBDClient *client, void *buffer, size_t size, Error **errp)
len = qio_channel_readv(client->ioc, &iov, 1, errp);
if (len == QIO_CHANNEL_ERR_BLOCK) {
client->read_yielding = true;
WITH_QEMU_LOCK_GUARD(&client->lock) {
client->read_yielding = true;
/* Prompt main loop thread to re-run nbd_drained_poll() */
aio_wait_kick();
}
qio_channel_yield(client->ioc, G_IO_IN);
client->read_yielding = false;
if (client->quiescing) {
return -EAGAIN;
WITH_QEMU_LOCK_GUARD(&client->lock) {
client->read_yielding = false;
if (client->quiescing) {
return -EAGAIN;
}
}
continue;
} else if (len < 0) {
@ -1501,14 +1510,17 @@ static int coroutine_fn nbd_receive_request(NBDClient *client, NBDRequest *reque
#define MAX_NBD_REQUESTS 16
/* Runs in export AioContext and main loop thread */
void nbd_client_get(NBDClient *client)
{
client->refcount++;
qatomic_inc(&client->refcount);
}
void nbd_client_put(NBDClient *client)
{
if (--client->refcount == 0) {
assert(qemu_in_main_thread());
if (qatomic_fetch_dec(&client->refcount) == 1) {
/* The last reference should be dropped by client->close,
* which is called by client_close.
*/
@ -1525,17 +1537,47 @@ void nbd_client_put(NBDClient *client)
blk_exp_unref(&client->exp->common);
}
g_free(client->contexts.bitmaps);
qemu_mutex_destroy(&client->lock);
g_free(client);
}
}
/*
* Tries to release the reference to @client, but only if other references
* remain. This is an optimization for the common case where we want to avoid
* the expense of scheduling nbd_client_put() in the main loop thread.
*
* Returns true upon success or false if the reference was not released because
* it is the last reference.
*/
static bool nbd_client_put_nonzero(NBDClient *client)
{
int old = qatomic_read(&client->refcount);
int expected;
do {
if (old == 1) {
return false;
}
expected = old;
old = qatomic_cmpxchg(&client->refcount, expected, expected - 1);
} while (old != expected);
return true;
}
static void client_close(NBDClient *client, bool negotiated)
{
if (client->closing) {
return;
}
assert(qemu_in_main_thread());
client->closing = true;
WITH_QEMU_LOCK_GUARD(&client->lock) {
if (client->closing) {
return;
}
client->closing = true;
}
/* Force requests to finish. They will drop their own references,
* then we'll close the socket and free the NBDClient.
@ -1549,6 +1591,7 @@ static void client_close(NBDClient *client, bool negotiated)
}
}
/* Runs in export AioContext with client->lock held */
static NBDRequestData *nbd_request_get(NBDClient *client)
{
NBDRequestData *req;
@ -1557,11 +1600,11 @@ static NBDRequestData *nbd_request_get(NBDClient *client)
client->nb_requests++;
req = g_new0(NBDRequestData, 1);
nbd_client_get(client);
req->client = client;
return req;
}
/* Runs in export AioContext with client->lock held */
static void nbd_request_put(NBDRequestData *req)
{
NBDClient *client = req->client;
@ -1578,8 +1621,6 @@ static void nbd_request_put(NBDRequestData *req)
}
nbd_client_receive_next_request(client);
nbd_client_put(client);
}
static void blk_aio_attached(AioContext *ctx, void *opaque)
@ -1587,14 +1628,18 @@ static void blk_aio_attached(AioContext *ctx, void *opaque)
NBDExport *exp = opaque;
NBDClient *client;
assert(qemu_in_main_thread());
trace_nbd_blk_aio_attached(exp->name, ctx);
exp->common.ctx = ctx;
QTAILQ_FOREACH(client, &exp->clients, next) {
assert(client->nb_requests == 0);
assert(client->recv_coroutine == NULL);
assert(client->send_coroutine == NULL);
WITH_QEMU_LOCK_GUARD(&client->lock) {
assert(client->nb_requests == 0);
assert(client->recv_coroutine == NULL);
assert(client->send_coroutine == NULL);
}
}
}
@ -1602,6 +1647,8 @@ static void blk_aio_detach(void *opaque)
{
NBDExport *exp = opaque;
assert(qemu_in_main_thread());
trace_nbd_blk_aio_detach(exp->name, exp->common.ctx);
exp->common.ctx = NULL;
@ -1612,8 +1659,12 @@ static void nbd_drained_begin(void *opaque)
NBDExport *exp = opaque;
NBDClient *client;
assert(qemu_in_main_thread());
QTAILQ_FOREACH(client, &exp->clients, next) {
client->quiescing = true;
WITH_QEMU_LOCK_GUARD(&client->lock) {
client->quiescing = true;
}
}
}
@ -1622,28 +1673,48 @@ static void nbd_drained_end(void *opaque)
NBDExport *exp = opaque;
NBDClient *client;
assert(qemu_in_main_thread());
QTAILQ_FOREACH(client, &exp->clients, next) {
client->quiescing = false;
nbd_client_receive_next_request(client);
WITH_QEMU_LOCK_GUARD(&client->lock) {
client->quiescing = false;
nbd_client_receive_next_request(client);
}
}
}
/* Runs in export AioContext */
static void nbd_wake_read_bh(void *opaque)
{
NBDClient *client = opaque;
qio_channel_wake_read(client->ioc);
}
static bool nbd_drained_poll(void *opaque)
{
NBDExport *exp = opaque;
NBDClient *client;
QTAILQ_FOREACH(client, &exp->clients, next) {
if (client->nb_requests != 0) {
/*
* If there's a coroutine waiting for a request on nbd_read_eof()
* enter it here so we don't depend on the client to wake it up.
*/
if (client->recv_coroutine != NULL && client->read_yielding) {
qio_channel_wake_read(client->ioc);
}
assert(qemu_in_main_thread());
return true;
QTAILQ_FOREACH(client, &exp->clients, next) {
WITH_QEMU_LOCK_GUARD(&client->lock) {
if (client->nb_requests != 0) {
/*
* If there's a coroutine waiting for a request on nbd_read_eof()
* enter it here so we don't depend on the client to wake it up.
*
* Schedule a BH in the export AioContext to avoid missing the
* wake up due to the race between qio_channel_wake_read() and
* qio_channel_yield().
*/
if (client->recv_coroutine != NULL && client->read_yielding) {
aio_bh_schedule_oneshot(nbd_export_aio_context(client->exp),
nbd_wake_read_bh, client);
}
return true;
}
}
}
@ -1654,6 +1725,8 @@ static void nbd_eject_notifier(Notifier *n, void *data)
{
NBDExport *exp = container_of(n, NBDExport, eject_notifier);
assert(qemu_in_main_thread());
blk_exp_request_shutdown(&exp->common);
}
@ -2539,7 +2612,6 @@ static int coroutine_fn nbd_co_receive_request(NBDRequestData *req,
int ret;
g_assert(qemu_in_coroutine());
assert(client->recv_coroutine == qemu_coroutine_self());
ret = nbd_receive_request(client, request, errp);
if (ret < 0) {
return ret;
@ -2936,15 +3008,23 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
static coroutine_fn void nbd_trip(void *opaque)
{
NBDClient *client = opaque;
NBDRequestData *req;
NBDRequestData *req = NULL;
NBDRequest request = { 0 }; /* GCC thinks it can be used uninitialized */
int ret;
Error *local_err = NULL;
/*
* Note that nbd_client_put() and client_close() must be called from the
* main loop thread. Use aio_co_reschedule_self() to switch AioContext
* before calling these functions.
*/
trace_nbd_trip();
qemu_mutex_lock(&client->lock);
if (client->closing) {
nbd_client_put(client);
return;
goto done;
}
if (client->quiescing) {
@ -2952,14 +3032,27 @@ static coroutine_fn void nbd_trip(void *opaque)
* We're switching between AIO contexts. Don't attempt to receive a new
* request and kick the main context which may be waiting for us.
*/
nbd_client_put(client);
client->recv_coroutine = NULL;
aio_wait_kick();
return;
goto done;
}
req = nbd_request_get(client);
ret = nbd_co_receive_request(req, &request, &local_err);
/*
* nbd_co_receive_request() returns -EAGAIN when nbd_drained_begin() has
* set client->quiescing but by the time we get back nbd_drained_end() may
* have already cleared client->quiescing. In that case we try again
* because nothing else will spawn an nbd_trip() coroutine until we set
* client->recv_coroutine = NULL further down.
*/
do {
assert(client->recv_coroutine == qemu_coroutine_self());
qemu_mutex_unlock(&client->lock);
ret = nbd_co_receive_request(req, &request, &local_err);
qemu_mutex_lock(&client->lock);
} while (ret == -EAGAIN && !client->quiescing);
client->recv_coroutine = NULL;
if (client->closing) {
@ -2971,15 +3064,16 @@ static coroutine_fn void nbd_trip(void *opaque)
}
if (ret == -EAGAIN) {
assert(client->quiescing);
goto done;
}
nbd_client_receive_next_request(client);
if (ret == -EIO) {
goto disconnect;
}
qemu_mutex_unlock(&client->lock);
qio_channel_set_cork(client->ioc, true);
if (ret < 0) {
@ -2999,6 +3093,10 @@ static coroutine_fn void nbd_trip(void *opaque)
g_free(request.contexts->bitmaps);
g_free(request.contexts);
}
qio_channel_set_cork(client->ioc, false);
qemu_mutex_lock(&client->lock);
if (ret < 0) {
error_prepend(&local_err, "Failed to send reply: ");
goto disconnect;
@ -3013,21 +3111,36 @@ static coroutine_fn void nbd_trip(void *opaque)
goto disconnect;
}
qio_channel_set_cork(client->ioc, false);
done:
nbd_request_put(req);
nbd_client_put(client);
if (req) {
nbd_request_put(req);
}
qemu_mutex_unlock(&client->lock);
if (!nbd_client_put_nonzero(client)) {
aio_co_reschedule_self(qemu_get_aio_context());
nbd_client_put(client);
}
return;
disconnect:
if (local_err) {
error_reportf_err(local_err, "Disconnect client, due to: ");
}
nbd_request_put(req);
qemu_mutex_unlock(&client->lock);
aio_co_reschedule_self(qemu_get_aio_context());
client_close(client, true);
nbd_client_put(client);
}
/*
* Runs in export AioContext and main loop thread. Caller must hold
* client->lock.
*/
static void nbd_client_receive_next_request(NBDClient *client)
{
if (!client->recv_coroutine && client->nb_requests < MAX_NBD_REQUESTS &&
@ -3053,7 +3166,9 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
return;
}
nbd_client_receive_next_request(client);
WITH_QEMU_LOCK_GUARD(&client->lock) {
nbd_client_receive_next_request(client);
}
}
/*
@ -3070,6 +3185,7 @@ void nbd_client_new(QIOChannelSocket *sioc,
Coroutine *co;
client = g_new0(NBDClient, 1);
qemu_mutex_init(&client->lock);
client->refcount = 1;
client->tlscreds = tlscreds;
if (tlscreds) {

2
net/colo-compare.c
View File

@ -1439,12 +1439,10 @@ static void colo_compare_finalize(Object *obj)
qemu_bh_delete(s->event_bh);
AioContext *ctx = iothread_get_aio_context(s->iothread);
aio_context_acquire(ctx);
AIO_WAIT_WHILE(ctx, !s->out_sendco.done);
if (s->notify_dev) {
AIO_WAIT_WHILE(ctx, !s->notify_sendco.done);
}
aio_context_release(ctx);
/* Release all unhandled packets after compare thead exited */
g_queue_foreach(&s->conn_list, colo_flush_packets, s);

16
qapi/string-output-visitor.c
View File

@ -292,6 +292,20 @@ static bool print_type_null(Visitor *v, const char *name, QNull **obj,
return true;
}
static bool start_struct(Visitor *v, const char *name, void **obj,
size_t size, Error **errp)
{
return true;
}
static void end_struct(Visitor *v, void **obj)
{
StringOutputVisitor *sov = to_sov(v);
/* TODO actually print struct fields */
string_output_set(sov, g_strdup("<omitted>"));
}
static bool
start_list(Visitor *v, const char *name, GenericList **list, size_t size,
Error **errp)
@ -379,6 +393,8 @@ Visitor *string_output_visitor_new(bool human, char **result)
v->visitor.type_str = print_type_str;
v->visitor.type_number = print_type_number;
v->visitor.type_null = print_type_null;
v->visitor.start_struct = start_struct;
v->visitor.end_struct = end_struct;
v->visitor.start_list = start_list;
v->visitor.next_list = next_list;
v->visitor.end_list = end_list;

29
qapi/virtio.json
View File

@ -928,3 +928,32 @@
'data': { 'path': 'str', 'queue': 'uint16', '*index': 'uint16' },
'returns': 'VirtioQueueElement',
'features': [ 'unstable' ] }
##
# @IOThreadVirtQueueMapping:
#
# Describes the subset of virtqueues assigned to an IOThread.
#
# @iothread: the id of IOThread object
#
# @vqs: an optional array of virtqueue indices that will be handled by this
# IOThread. When absent, virtqueues are assigned round-robin across all
# IOThreadVirtQueueMappings provided. Either all IOThreadVirtQueueMappings
# must have @vqs or none of them must have it.
#
# Since: 9.0
##
{ 'struct': 'IOThreadVirtQueueMapping',
'data': { 'iothread': 'str', '*vqs': ['uint16'] } }
##
# @DummyVirtioForceArrays:
#
# Not used by QMP; hack to let us use IOThreadVirtQueueMappingList internally
#
# Since: 9.0
##
{ 'struct': 'DummyVirtioForceArrays',
'data': { 'unused-iothread-vq-mapping': ['IOThreadVirtQueueMapping'] } }

4
qemu-img.c
View File

@ -960,7 +960,6 @@ static int img_commit(int argc, char **argv)
Error *local_err = NULL;
CommonBlockJobCBInfo cbi;
bool image_opts = false;
AioContext *aio_context;
int64_t rate_limit = 0;
fmt = NULL;
@ -1078,12 +1077,9 @@ static int img_commit(int argc, char **argv)
.bs = bs,
};
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
commit_active_start("commit", bs, base_bs, JOB_DEFAULT, rate_limit,
BLOCKDEV_ON_ERROR_REPORT, NULL, common_block_job_cb,
&cbi, false, &local_err);
aio_context_release(aio_context);
if (local_err) {
goto done;
}

10
qemu-io.c
View File

@ -414,15 +414,7 @@ static void prep_fetchline(void *opaque)
static int do_qemuio_command(const char *cmd)
{
int ret;
AioContext *ctx =
qemuio_blk ? blk_get_aio_context(qemuio_blk) : qemu_get_aio_context();
aio_context_acquire(ctx);
ret = qemuio_command(qemuio_blk, cmd);
aio_context_release(ctx);
return ret;
return qemuio_command(qemuio_blk, cmd);
}
static int command_loop(void)

2
qemu-nbd.c
View File

@ -1123,9 +1123,7 @@ int main(int argc, char **argv)
qdict_put_str(raw_opts, "file", bs->node_name);
qdict_put_int(raw_opts, "offset", dev_offset);
aio_context_acquire(qemu_get_aio_context());
bs = bdrv_open(NULL, NULL, raw_opts, flags, &error_fatal);
aio_context_release(qemu_get_aio_context());
blk_remove_bs(blk);
blk_insert_bs(blk, bs, &error_fatal);

4
replay/replay-debugging.c
View File

@ -144,7 +144,6 @@ static char *replay_find_nearest_snapshot(int64_t icount,
char *ret = NULL;
int rv;
int nb_sns, i;
AioContext *aio_context;
*snapshot_icount = -1;
@ -152,11 +151,8 @@ static char *replay_find_nearest_snapshot(int64_t icount,
if (!bs) {
goto fail;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
nb_sns = bdrv_snapshot_list(bs, &sn_tab);
aio_context_release(aio_context);
for (i = 0; i < nb_sns; i++) {
rv = bdrv_all_has_snapshot(sn_tab[i].name, false, NULL, NULL);

13
scripts/block-coroutine-wrapper.py
View File

@ -92,8 +92,6 @@ class FuncDecl:
f"{self.name}")
self.target_name = f'{subsystem}_{subname}'
self.ctx = self.gen_ctx()
self.get_result = 's->ret = '
self.ret = 'return s.ret;'
self.co_ret = 'return '
@ -167,7 +165,7 @@ def create_mixed_wrapper(func: FuncDecl) -> str:
{func.co_ret}{name}({ func.gen_list('{name}') });
}} else {{
{struct_name} s = {{
.poll_state.ctx = {func.ctx},
.poll_state.ctx = qemu_get_current_aio_context(),
.poll_state.in_progress = true,
{ func.gen_block(' .{name} = {name},') }
@ -191,7 +189,7 @@ def create_co_wrapper(func: FuncDecl) -> str:
{func.return_type} {func.name}({ func.gen_list('{decl}') })
{{
{struct_name} s = {{
.poll_state.ctx = {func.ctx},
.poll_state.ctx = qemu_get_current_aio_context(),
.poll_state.in_progress = true,
{ func.gen_block(' .{name} = {name},') }
@ -261,8 +259,8 @@ def gen_no_co_wrapper(func: FuncDecl) -> str:
graph_lock=' bdrv_graph_rdlock_main_loop();'
graph_unlock=' bdrv_graph_rdunlock_main_loop();'
elif func.graph_wrlock:
graph_lock=' bdrv_graph_wrlock(NULL);'
graph_unlock=' bdrv_graph_wrunlock(NULL);'
graph_lock=' bdrv_graph_wrlock();'
graph_unlock=' bdrv_graph_wrunlock();'
return f"""\
/*
@ -278,12 +276,9 @@ typedef struct {struct_name} {{
static void {name}_bh(void *opaque)
{{
{struct_name} *s = opaque;
AioContext *ctx = {func.gen_ctx('s->')};
{graph_lock}
aio_context_acquire(ctx);
{func.get_result}{name}({ func.gen_list('s->{name}') });
aio_context_release(ctx);
{graph_unlock}
aio_co_wake(s->co);

10
system/dma-helpers.c
View File

@ -119,13 +119,15 @@ static void dma_blk_cb(void *opaque, int ret)
trace_dma_blk_cb(dbs, ret);
aio_context_acquire(ctx);
/* DMAAIOCB is not thread-safe and must be accessed only from dbs->ctx */
assert(ctx == qemu_get_current_aio_context());
dbs->acb = NULL;
dbs->offset += dbs->iov.size;
if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) {
dma_complete(dbs, ret);
goto out;
return;
}
dma_blk_unmap(dbs);
@ -168,7 +170,7 @@ static void dma_blk_cb(void *opaque, int ret)
trace_dma_map_wait(dbs);
dbs->bh = aio_bh_new(ctx, reschedule_dma, dbs);
cpu_register_map_client(dbs->bh);
goto out;
return;
}
if (!QEMU_IS_ALIGNED(dbs->iov.size, dbs->align)) {
@ -179,8 +181,6 @@ static void dma_blk_cb(void *opaque, int ret)
dbs->acb = dbs->io_func(dbs->offset, &dbs->iov,
dma_blk_cb, dbs, dbs->io_func_opaque);
assert(dbs->acb);
out:
aio_context_release(ctx);
}
static void dma_aio_cancel(BlockAIOCB *acb)

4
system/vl.c
View File

@ -2426,6 +2426,10 @@ static void qemu_validate_options(const QDict *machine_opts)
}
}
if (loadvm && incoming) {
error_report("'incoming' and 'loadvm' options are mutually exclusive");
exit(EXIT_FAILURE);
}
if (loadvm && preconfig_requested) {
error_report("'preconfig' and 'loadvm' options are "
"mutually exclusive");

2
tests/qemu-iotests/202
View File

@ -21,7 +21,7 @@
# Check that QMP 'transaction' blockdev-snapshot-sync with multiple drives on a
# single IOThread completes successfully. This particular command triggered a
# hang due to recursive AioContext locking and BDRV_POLL_WHILE(). Protect
# against regressions.
# against regressions even though the AioContext lock no longer exists.
import iotests

3
tests/qemu-iotests/203
View File

@ -21,7 +21,8 @@
# Check that QMP 'migrate' with multiple drives on a single IOThread completes
# successfully. This particular command triggered a hang in the source QEMU
# process due to recursive AioContext locking in bdrv_invalidate_all() and
# BDRV_POLL_WHILE().
# BDRV_POLL_WHILE(). Protect against regressions even though the AioContext
# lock no longer exists.
import iotests

170
tests/qemu-iotests/tests/qcow2-internal-snapshots Executable file
View File

@ -0,0 +1,170 @@
#!/usr/bin/env bash
# group: rw quick
#
# Test case for internal snapshots in qcow2
#
# Copyright (C) 2023 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# creator
owner=kwolf@redhat.com
seq="$(basename $0)"
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ../common.rc
. ../common.filter
# This tests qcow2-specific low-level functionality
_supported_fmt qcow2
_supported_proto generic
# Internal snapshots are (currently) impossible with refcount_bits=1,
# and generally impossible with external data files
_unsupported_imgopts 'compat=0.10' 'refcount_bits=1[^0-9]' data_file
IMG_SIZE=64M
_qemu()
{
$QEMU -no-shutdown -nographic -monitor stdio -serial none \
-blockdev file,filename="$TEST_IMG",node-name=disk0-file \
-blockdev "$IMGFMT",file=disk0-file,node-name=disk0 \
-object iothread,id=iothread0 \
-device virtio-scsi,iothread=iothread0 \
-device scsi-hd,drive=disk0,share-rw=on \
"$@" 2>&1 |\
_filter_qemu | _filter_hmp | _filter_qemu_io
}
_make_test_img $IMG_SIZE
echo
echo "=== Write some data, take a snapshot and overwrite part of it ==="
echo
{
echo 'qemu-io disk0 "write -P0x11 0 1M"'
# Give qemu some time to boot before saving the VM state
sleep 0.5
echo "savevm snap0"
echo 'qemu-io disk0 "write -P0x22 0 512k"'
echo "quit"
} | _qemu
echo
$QEMU_IMG snapshot -l "$TEST_IMG" | _filter_date | _filter_vmstate_size
_check_test_img
echo
echo "=== Verify that loading the snapshot reverts to the old content ==="
echo
{
# -loadvm reverted the write from the previous QEMU instance
echo 'qemu-io disk0 "read -P0x11 0 1M"'
# Verify that it works without restarting QEMU, too
echo 'qemu-io disk0 "write -P0x33 512k 512k"'
echo "loadvm snap0"
echo 'qemu-io disk0 "read -P0x11 0 1M"'
# Verify COW by writing a partial cluster
echo 'qemu-io disk0 "write -P0x33 63k 2k"'
echo 'qemu-io disk0 "read -P0x11 0 63k"'
echo 'qemu-io disk0 "read -P0x33 63k 2k"'
echo 'qemu-io disk0 "read -P0x11 65k 63k"'
# Take a second snapshot
echo "savevm snap1"
echo "quit"
} | _qemu -loadvm snap0
echo
$QEMU_IMG snapshot -l "$TEST_IMG" | _filter_date | _filter_vmstate_size
_check_test_img
echo
echo "=== qemu-img snapshot can revert to snapshots ==="
echo
$QEMU_IMG snapshot -a snap0 "$TEST_IMG"
$QEMU_IO -c "read -P0x11 0 1M" "$TEST_IMG" | _filter_qemu_io
$QEMU_IMG snapshot -a snap1 "$TEST_IMG"
$QEMU_IO \
-c "read -P0x11 0 63k" \
-c "read -P0x33 63k 2k" \
-c "read -P0x11 65k 63k" \
"$TEST_IMG" | _filter_qemu_io
echo
echo "=== Deleting snapshots ==="
echo
{
# The active layer stays unaffected by deleting the snapshot
echo "delvm snap1"
echo 'qemu-io disk0 "read -P0x11 0 63k"'
echo 'qemu-io disk0 "read -P0x33 63k 2k"'
echo 'qemu-io disk0 "read -P0x11 65k 63k"'
echo "quit"
} | _qemu
echo
$QEMU_IMG snapshot -l "$TEST_IMG" | _filter_date | _filter_vmstate_size
_check_test_img
echo
echo "=== Error cases ==="
echo
# snap1 should not exist any more
_qemu -loadvm snap1
echo
{
echo "loadvm snap1"
echo "quit"
} | _qemu
# Snapshot operations and inactive images are incompatible
echo
_qemu -loadvm snap0 -incoming defer
{
echo "loadvm snap0"
echo "delvm snap0"
echo "savevm snap1"
echo "quit"
} | _qemu -incoming defer
# -loadvm and -preconfig are incompatible
echo
_qemu -loadvm snap0 -preconfig
# success, all done
echo "*** done"
rm -f $seq.full
status=0

107
tests/qemu-iotests/tests/qcow2-internal-snapshots.out Normal file
View File

@ -0,0 +1,107 @@
QA output created by qcow2-internal-snapshots
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
=== Write some data, take a snapshot and overwrite part of it ===
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) qemu-io disk0 "write -P0x11 0 1M"
wrote 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) savevm snap0
(qemu) qemu-io disk0 "write -P0x22 0 512k"
wrote 524288/524288 bytes at offset 0
512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) quit
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK ICOUNT
1 snap0 SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
No errors were found on the image.
=== Verify that loading the snapshot reverts to the old content ===
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) qemu-io disk0 "read -P0x11 0 1M"
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "write -P0x33 512k 512k"
wrote 524288/524288 bytes at offset 524288
512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) loadvm snap0
(qemu) qemu-io disk0 "read -P0x11 0 1M"
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "write -P0x33 63k 2k"
wrote 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x11 0 63k"
read 64512/64512 bytes at offset 0
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x33 63k 2k"
read 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x11 65k 63k"
read 64512/64512 bytes at offset 66560
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) savevm snap1
(qemu) quit
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK ICOUNT
1 snap0 SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
2 snap1 SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
No errors were found on the image.
=== qemu-img snapshot can revert to snapshots ===
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 64512/64512 bytes at offset 0
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 64512/64512 bytes at offset 66560
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Deleting snapshots ===
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) delvm snap1
(qemu) qemu-io disk0 "read -P0x11 0 63k"
read 64512/64512 bytes at offset 0
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x33 63k 2k"
read 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x11 65k 63k"
read 64512/64512 bytes at offset 66560
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) quit
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK ICOUNT
1 snap0 SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
No errors were found on the image.
=== Error cases ===
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) QEMU_PROG: Snapshot 'snap1' does not exist in one or more devices
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) loadvm snap1
Error: Snapshot 'snap1' does not exist in one or more devices
(qemu) quit
QEMU_PROG: 'incoming' and 'loadvm' options are mutually exclusive
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) loadvm snap0
Error: Device 'disk0' is writable but does not support snapshots
(qemu) delvm snap0
Error: Device 'disk0' is writable but does not support snapshots
(qemu) savevm snap1
Error: Device 'disk0' is writable but does not support snapshots
(qemu) quit
QEMU_PROG: 'preconfig' and 'loadvm' options are mutually exclusive
*** done

1
tests/tsan/suppressions.tsan
View File

@ -4,7 +4,6 @@
# TSan reports a double lock on RECURSIVE mutexes.
# Since the recursive lock is intentional, we choose to ignore it.
mutex:aio_context_acquire
mutex:pthread_mutex_lock
# TSan reports a race between pthread_mutex_init() and

67
tests/unit/test-aio.c
View File

@ -100,76 +100,12 @@ static void event_ready_cb(EventNotifier *e)
/* Tests using aio_*. */
typedef struct {
QemuMutex start_lock;
EventNotifier notifier;
bool thread_acquired;
} AcquireTestData;
static void *test_acquire_thread(void *opaque)
{
AcquireTestData *data = opaque;
/* Wait for other thread to let us start */
qemu_mutex_lock(&data->start_lock);
qemu_mutex_unlock(&data->start_lock);
/* event_notifier_set might be called either before or after
* the main thread's call to poll(). The test case's outcome
* should be the same in either case.
*/
event_notifier_set(&data->notifier);
aio_context_acquire(ctx);
aio_context_release(ctx);
data->thread_acquired = true; /* success, we got here */
return NULL;
}
static void set_event_notifier(AioContext *nctx, EventNotifier *notifier,
EventNotifierHandler *handler)
{
aio_set_event_notifier(nctx, notifier, handler, NULL, NULL);
}
static void dummy_notifier_read(EventNotifier *n)
{
event_notifier_test_and_clear(n);
}
static void test_acquire(void)
{
QemuThread thread;
AcquireTestData data;
/* Dummy event notifier ensures aio_poll() will block */
event_notifier_init(&data.notifier, false);
set_event_notifier(ctx, &data.notifier, dummy_notifier_read);
g_assert(!aio_poll(ctx, false)); /* consume aio_notify() */
qemu_mutex_init(&data.start_lock);
qemu_mutex_lock(&data.start_lock);
data.thread_acquired = false;
qemu_thread_create(&thread, "test_acquire_thread",
test_acquire_thread,
&data, QEMU_THREAD_JOINABLE);
/* Block in aio_poll(), let other thread kick us and acquire context */
aio_context_acquire(ctx);
qemu_mutex_unlock(&data.start_lock); /* let the thread run */
g_assert(aio_poll(ctx, true));
g_assert(!data.thread_acquired);
aio_context_release(ctx);
qemu_thread_join(&thread);
set_event_notifier(ctx, &data.notifier, NULL);
event_notifier_cleanup(&data.notifier);
g_assert(data.thread_acquired);
}
static void test_bh_schedule(void)
{
BHTestData data = { .n = 0 };
@ -879,7 +815,7 @@ static void test_worker_thread_co_enter(void)
qemu_thread_get_self(&this_thread);
co = qemu_coroutine_create(co_check_current_thread, &this_thread);
qemu_thread_create(&worker_thread, "test_acquire_thread",
qemu_thread_create(&worker_thread, "test_aio_co_enter",
test_aio_co_enter,
co, QEMU_THREAD_JOINABLE);
@ -899,7 +835,6 @@ int main(int argc, char **argv)
while (g_main_context_iteration(NULL, false));
g_test_init(&argc, &argv, NULL);
g_test_add_func("/aio/acquire", test_acquire);
g_test_add_func("/aio/bh/schedule", test_bh_schedule);
g_test_add_func("/aio/bh/schedule10", test_bh_schedule10);
g_test_add_func("/aio/bh/cancel", test_bh_cancel);

91
tests/unit/test-bdrv-drain.c
View File

@ -179,13 +179,7 @@ static void do_drain_end(enum drain_type drain_type, BlockDriverState *bs)
static void do_drain_begin_unlocked(enum drain_type drain_type, BlockDriverState *bs)
{
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_acquire(bdrv_get_aio_context(bs));
}
do_drain_begin(drain_type, bs);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_release(bdrv_get_aio_context(bs));
}
}
static BlockBackend * no_coroutine_fn test_setup(void)
@ -209,13 +203,7 @@ static BlockBackend * no_coroutine_fn test_setup(void)
static void do_drain_end_unlocked(enum drain_type drain_type, BlockDriverState *bs)
{
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_acquire(bdrv_get_aio_context(bs));
}
do_drain_end(drain_type, bs);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_release(bdrv_get_aio_context(bs));
}
}
/*
@ -520,12 +508,8 @@ static void test_iothread_main_thread_bh(void *opaque)
{
struct test_iothread_data *data = opaque;
/* Test that the AioContext is not yet locked in a random BH that is
* executed during drain, otherwise this would deadlock. */
aio_context_acquire(bdrv_get_aio_context(data->bs));
bdrv_flush(data->bs);
bdrv_dec_in_flight(data->bs); /* incremented by test_iothread_common() */
aio_context_release(bdrv_get_aio_context(data->bs));
}
/*
@ -567,7 +551,6 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread)
blk_set_disable_request_queuing(blk, true);
blk_set_aio_context(blk, ctx_a, &error_abort);
aio_context_acquire(ctx_a);
s->bh_indirection_ctx = ctx_b;
@ -582,8 +565,6 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread)
g_assert(acb != NULL);
g_assert_cmpint(aio_ret, ==, -EINPROGRESS);
aio_context_release(ctx_a);
data = (struct test_iothread_data) {
.bs = bs,
.drain_type = drain_type,
@ -592,10 +573,6 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread)
switch (drain_thread) {
case 0:
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_acquire(ctx_a);
}
/*
* Increment in_flight so that do_drain_begin() waits for
* test_iothread_main_thread_bh(). This prevents the race between
@ -613,20 +590,10 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread)
do_drain_begin(drain_type, bs);
g_assert_cmpint(bs->in_flight, ==, 0);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_release(ctx_a);
}
qemu_event_wait(&done_event);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_acquire(ctx_a);
}
g_assert_cmpint(aio_ret, ==, 0);
do_drain_end(drain_type, bs);
if (drain_type != BDRV_DRAIN_ALL) {
aio_context_release(ctx_a);
}
break;
case 1:
co = qemu_coroutine_create(test_iothread_drain_co_entry, &data);
@ -637,9 +604,7 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread)
g_assert_not_reached();
}
aio_context_acquire(ctx_a);
blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
aio_context_release(ctx_a);
bdrv_unref(bs);
blk_unref(blk);
@ -757,7 +722,6 @@ static void test_blockjob_common_drain_node(enum drain_type drain_type,
BlockJob *job;
TestBlockJob *tjob;
IOThread *iothread = NULL;
AioContext *ctx;
int ret;
src = bdrv_new_open_driver(&bdrv_test, "source", BDRV_O_RDWR,
@ -787,11 +751,11 @@ static void test_blockjob_common_drain_node(enum drain_type drain_type,
}
if (use_iothread) {
AioContext *ctx;
iothread = iothread_new();
ctx = iothread_get_aio_context(iothread);
blk_set_aio_context(blk_src, ctx, &error_abort);
} else {
ctx = qemu_get_aio_context();
}
target = bdrv_new_open_driver(&bdrv_test, "target", BDRV_O_RDWR,
@ -800,16 +764,15 @@ static void test_blockjob_common_drain_node(enum drain_type drain_type,
blk_insert_bs(blk_target, target, &error_abort);
blk_set_allow_aio_context_change(blk_target, true);
aio_context_acquire(ctx);
tjob = block_job_create("job0", &test_job_driver, NULL, src,
0, BLK_PERM_ALL,
0, 0, NULL, NULL, &error_abort);
tjob->bs = src;
job = &tjob->common;
bdrv_graph_wrlock(target);
bdrv_graph_wrlock();
block_job_add_bdrv(job, "target", target, 0, BLK_PERM_ALL, &error_abort);
bdrv_graph_wrunlock(target);
bdrv_graph_wrunlock();
switch (result) {
case TEST_JOB_SUCCESS:
@ -821,7 +784,6 @@ static void test_blockjob_common_drain_node(enum drain_type drain_type,
tjob->prepare_ret = -EIO;
break;
}
aio_context_release(ctx);
job_start(&job->job);
@ -912,12 +874,10 @@ static void test_blockjob_common_drain_node(enum drain_type drain_type,
}
g_assert_cmpint(ret, ==, (result == TEST_JOB_SUCCESS ? 0 : -EIO));
aio_context_acquire(ctx);
if (use_iothread) {
blk_set_aio_context(blk_src, qemu_get_aio_context(), &error_abort);
assert(blk_get_aio_context(blk_target) == qemu_get_aio_context());
}
aio_context_release(ctx);
blk_unref(blk_src);
blk_unref(blk_target);
@ -991,11 +951,11 @@ static void bdrv_test_top_close(BlockDriverState *bs)
{
BdrvChild *c, *next_c;
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
QLIST_FOREACH_SAFE(c, &bs->children, next, next_c) {
bdrv_unref_child(bs, c);
}
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
}
static int coroutine_fn GRAPH_RDLOCK
@ -1085,10 +1045,10 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete,
null_bs = bdrv_open("null-co://", NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
&error_abort);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_attach_child(bs, null_bs, "null-child", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
/* This child will be the one to pass to requests through to, and
* it will stall until a drain occurs */
@ -1096,21 +1056,21 @@ static void do_test_delete_by_drain(bool detach_instead_of_delete,
&error_abort);
child_bs->total_sectors = 65536 >> BDRV_SECTOR_BITS;
/* Takes our reference to child_bs */
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
tts->wait_child = bdrv_attach_child(bs, child_bs, "wait-child",
&child_of_bds,
BDRV_CHILD_DATA | BDRV_CHILD_PRIMARY,
&error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
/* This child is just there to be deleted
* (for detach_instead_of_delete == true) */
null_bs = bdrv_open("null-co://", NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
&error_abort);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_attach_child(bs, null_bs, "null-child", &child_of_bds, BDRV_CHILD_DATA,
&error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
blk = blk_new(qemu_get_aio_context(), BLK_PERM_ALL, BLK_PERM_ALL);
blk_insert_bs(blk, bs, &error_abort);
@ -1193,14 +1153,14 @@ static void no_coroutine_fn detach_indirect_bh(void *opaque)
bdrv_dec_in_flight(data->child_b->bs);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_unref_child(data->parent_b, data->child_b);
bdrv_ref(data->c);
data->child_c = bdrv_attach_child(data->parent_b, data->c, "PB-C",
&child_of_bds, BDRV_CHILD_DATA,
&error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
}
static void coroutine_mixed_fn detach_by_parent_aio_cb(void *opaque, int ret)
@ -1298,7 +1258,7 @@ static void TSA_NO_TSA test_detach_indirect(bool by_parent_cb)
/* Set child relationships */
bdrv_ref(b);
bdrv_ref(a);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
child_b = bdrv_attach_child(parent_b, b, "PB-B", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
child_a = bdrv_attach_child(parent_b, a, "PB-A", &child_of_bds,
@ -1308,7 +1268,7 @@ static void TSA_NO_TSA test_detach_indirect(bool by_parent_cb)
bdrv_attach_child(parent_a, a, "PA-A",
by_parent_cb ? &child_of_bds : &detach_by_driver_cb_class,
BDRV_CHILD_DATA, &error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
g_assert_cmpint(parent_a->refcnt, ==, 1);
g_assert_cmpint(parent_b->refcnt, ==, 1);
@ -1401,9 +1361,7 @@ static void test_append_to_drained(void)
g_assert_cmpint(base_s->drain_count, ==, 1);
g_assert_cmpint(base->in_flight, ==, 0);
aio_context_acquire(qemu_get_aio_context());
bdrv_append(overlay, base, &error_abort);
aio_context_release(qemu_get_aio_context());
g_assert_cmpint(base->in_flight, ==, 0);
g_assert_cmpint(overlay->in_flight, ==, 0);
@ -1438,16 +1396,11 @@ static void test_set_aio_context(void)
bdrv_drained_begin(bs);
bdrv_try_change_aio_context(bs, ctx_a, NULL, &error_abort);
aio_context_acquire(ctx_a);
bdrv_drained_end(bs);
bdrv_drained_begin(bs);
bdrv_try_change_aio_context(bs, ctx_b, NULL, &error_abort);
aio_context_release(ctx_a);
aio_context_acquire(ctx_b);
bdrv_try_change_aio_context(bs, qemu_get_aio_context(), NULL, &error_abort);
aio_context_release(ctx_b);
bdrv_drained_end(bs);
bdrv_unref(bs);
@ -1727,7 +1680,7 @@ static void test_drop_intermediate_poll(void)
* Establish the chain last, so the chain links are the first
* elements in the BDS.parents lists
*/
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
for (i = 0; i < 3; i++) {
if (i) {
/* Takes the reference to chain[i - 1] */
@ -1735,7 +1688,7 @@ static void test_drop_intermediate_poll(void)
&chain_child_class, BDRV_CHILD_COW, &error_abort);
}
}
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
job = block_job_create("job", &test_simple_job_driver, NULL, job_node,
0, BLK_PERM_ALL, 0, 0, NULL, NULL, &error_abort);
@ -1982,10 +1935,10 @@ static void do_test_replace_child_mid_drain(int old_drain_count,
new_child_bs->total_sectors = 1;
bdrv_ref(old_child_bs);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_attach_child(parent_bs, old_child_bs, "child", &child_of_bds,
BDRV_CHILD_COW, &error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
parent_s->setup_completed = true;
for (i = 0; i < old_drain_count; i++) {
@ -2016,9 +1969,9 @@ static void do_test_replace_child_mid_drain(int old_drain_count,
g_assert(parent_bs->quiesce_counter == old_drain_count);
bdrv_drained_begin(old_child_bs);
bdrv_drained_begin(new_child_bs);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_replace_node(old_child_bs, new_child_bs, &error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
bdrv_drained_end(new_child_bs);
bdrv_drained_end(old_child_bs);
g_assert(parent_bs->quiesce_counter == new_drain_count);

26
tests/unit/test-bdrv-graph-mod.c
View File

@ -137,15 +137,13 @@ static void test_update_perm_tree(void)
blk_insert_bs(root, bs, &error_abort);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_attach_child(filter, bs, "child", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
aio_context_acquire(qemu_get_aio_context());
ret = bdrv_append(filter, bs, NULL);
g_assert_cmpint(ret, <, 0);
aio_context_release(qemu_get_aio_context());
bdrv_unref(filter);
blk_unref(root);
@ -206,14 +204,12 @@ static void test_should_update_child(void)
bdrv_set_backing_hd(target, bs, &error_abort);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
g_assert(target->backing->bs == bs);
bdrv_attach_child(filter, target, "target", &child_of_bds,
BDRV_CHILD_DATA, &error_abort);
bdrv_graph_wrunlock(NULL);
aio_context_acquire(qemu_get_aio_context());
bdrv_graph_wrunlock();
bdrv_append(filter, bs, &error_abort);
aio_context_release(qemu_get_aio_context());
bdrv_graph_rdlock_main_loop();
g_assert(target->backing->bs == bs);
@ -248,7 +244,7 @@ static void test_parallel_exclusive_write(void)
bdrv_ref(base);
bdrv_ref(fl1);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_attach_child(top, fl1, "backing", &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
&error_abort);
@ -260,7 +256,7 @@ static void test_parallel_exclusive_write(void)
&error_abort);
bdrv_replace_node(fl1, fl2, &error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
bdrv_drained_end(fl2);
bdrv_drained_end(fl1);
@ -367,7 +363,7 @@ static void test_parallel_perm_update(void)
*/
bdrv_ref(base);
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_attach_child(top, ws, "file", &child_of_bds, BDRV_CHILD_DATA,
&error_abort);
c_fl1 = bdrv_attach_child(ws, fl1, "first", &child_of_bds,
@ -380,7 +376,7 @@ static void test_parallel_perm_update(void)
bdrv_attach_child(fl2, base, "backing", &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
&error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
/* Select fl1 as first child to be active */
s->selected = c_fl1;
@ -434,15 +430,13 @@ static void test_append_greedy_filter(void)
BlockDriverState *base = no_perm_node("base");
BlockDriverState *fl = exclusive_writer_node("fl1");
bdrv_graph_wrlock(NULL);
bdrv_graph_wrlock();
bdrv_attach_child(top, base, "backing", &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
&error_abort);
bdrv_graph_wrunlock(NULL);
bdrv_graph_wrunlock();
aio_context_acquire(qemu_get_aio_context());
bdrv_append(fl, base, &error_abort);
aio_context_release(qemu_get_aio_context());
bdrv_unref(fl);
bdrv_unref(top);
}

31
tests/unit/test-block-iothread.c
View File

@ -483,7 +483,6 @@ static void test_sync_op(const void *opaque)
bdrv_graph_rdunlock_main_loop();
blk_set_aio_context(blk, ctx, &error_abort);
aio_context_acquire(ctx);
if (t->fn) {
t->fn(c);
}
@ -491,7 +490,6 @@ static void test_sync_op(const void *opaque)
t->blkfn(blk);
}
blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
aio_context_release(ctx);
bdrv_unref(bs);
blk_unref(blk);
@ -576,9 +574,7 @@ static void test_attach_blockjob(void)
aio_poll(qemu_get_aio_context(), false);
}
aio_context_acquire(ctx);
blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
aio_context_release(ctx);
tjob->n = 0;
while (tjob->n == 0) {
@ -595,9 +591,7 @@ static void test_attach_blockjob(void)
WITH_JOB_LOCK_GUARD() {
job_complete_sync_locked(&tjob->common.job, &error_abort);
}
aio_context_acquire(ctx);
blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
aio_context_release(ctx);
bdrv_unref(bs);
blk_unref(blk);
@ -654,9 +648,7 @@ static void test_propagate_basic(void)
/* Switch the AioContext back */
main_ctx = qemu_get_aio_context();
aio_context_acquire(ctx);
blk_set_aio_context(blk, main_ctx, &error_abort);
aio_context_release(ctx);
g_assert(blk_get_aio_context(blk) == main_ctx);
g_assert(bdrv_get_aio_context(bs_a) == main_ctx);
g_assert(bdrv_get_aio_context(bs_verify) == main_ctx);
@ -732,9 +724,7 @@ static void test_propagate_diamond(void)
/* Switch the AioContext back */
main_ctx = qemu_get_aio_context();
aio_context_acquire(ctx);
blk_set_aio_context(blk, main_ctx, &error_abort);
aio_context_release(ctx);
g_assert(blk_get_aio_context(blk) == main_ctx);
g_assert(bdrv_get_aio_context(bs_verify) == main_ctx);
g_assert(bdrv_get_aio_context(bs_a) == main_ctx);
@ -764,13 +754,11 @@ static void test_propagate_mirror(void)
&error_abort);
/* Start a mirror job */
aio_context_acquire(main_ctx);
mirror_start("job0", src, target, NULL, JOB_DEFAULT, 0, 0, 0,
MIRROR_SYNC_MODE_NONE, MIRROR_OPEN_BACKING_CHAIN, false,
BLOCKDEV_ON_ERROR_REPORT, BLOCKDEV_ON_ERROR_REPORT,
false, "filter_node", MIRROR_COPY_MODE_BACKGROUND,
&error_abort);
aio_context_release(main_ctx);
WITH_JOB_LOCK_GUARD() {
job = job_get_locked("job0");
@ -785,9 +773,7 @@ static void test_propagate_mirror(void)
g_assert(job->aio_context == ctx);
/* Change the AioContext of target */
aio_context_acquire(ctx);
bdrv_try_change_aio_context(target, main_ctx, NULL, &error_abort);
aio_context_release(ctx);
g_assert(bdrv_get_aio_context(src) == main_ctx);
g_assert(bdrv_get_aio_context(target) == main_ctx);
g_assert(bdrv_get_aio_context(filter) == main_ctx);
@ -805,10 +791,8 @@ static void test_propagate_mirror(void)
g_assert(bdrv_get_aio_context(filter) == main_ctx);
/* ...unless we explicitly allow it */
aio_context_acquire(ctx);
blk_set_allow_aio_context_change(blk, true);
bdrv_try_change_aio_context(target, ctx, NULL, &error_abort);
aio_context_release(ctx);
g_assert(blk_get_aio_context(blk) == ctx);
g_assert(bdrv_get_aio_context(src) == ctx);
@ -817,10 +801,8 @@ static void test_propagate_mirror(void)
job_cancel_sync_all();
aio_context_acquire(ctx);
blk_set_aio_context(blk, main_ctx, &error_abort);
bdrv_try_change_aio_context(target, main_ctx, NULL, &error_abort);
aio_context_release(ctx);
blk_unref(blk);
bdrv_unref(src);
@ -836,7 +818,6 @@ static void test_attach_second_node(void)
BlockDriverState *bs, *filter;
QDict *options;
aio_context_acquire(main_ctx);
blk = blk_new(ctx, BLK_PERM_ALL, BLK_PERM_ALL);
bs = bdrv_new_open_driver(&bdrv_test, "base", BDRV_O_RDWR, &error_abort);
blk_insert_bs(blk, bs, &error_abort);
@ -846,15 +827,12 @@ static void test_attach_second_node(void)
qdict_put_str(options, "file", "base");
filter = bdrv_open(NULL, NULL, options, BDRV_O_RDWR, &error_abort);
aio_context_release(main_ctx);
g_assert(blk_get_aio_context(blk) == ctx);
g_assert(bdrv_get_aio_context(bs) == ctx);
g_assert(bdrv_get_aio_context(filter) == ctx);
aio_context_acquire(ctx);
blk_set_aio_context(blk, main_ctx, &error_abort);
aio_context_release(ctx);
g_assert(blk_get_aio_context(blk) == main_ctx);
g_assert(bdrv_get_aio_context(bs) == main_ctx);
g_assert(bdrv_get_aio_context(filter) == main_ctx);
@ -868,11 +846,9 @@ static void test_attach_preserve_blk_ctx(void)
{
IOThread *iothread = iothread_new();
AioContext *ctx = iothread_get_aio_context(iothread);
AioContext *main_ctx = qemu_get_aio_context();
BlockBackend *blk;
BlockDriverState *bs;
aio_context_acquire(main_ctx);
blk = blk_new(ctx, BLK_PERM_ALL, BLK_PERM_ALL);
bs = bdrv_new_open_driver(&bdrv_test, "base", BDRV_O_RDWR, &error_abort);
bs->total_sectors = 65536 / BDRV_SECTOR_SIZE;
@ -881,25 +857,18 @@ static void test_attach_preserve_blk_ctx(void)
blk_insert_bs(blk, bs, &error_abort);
g_assert(blk_get_aio_context(blk) == ctx);
g_assert(bdrv_get_aio_context(bs) == ctx);
aio_context_release(main_ctx);
/* Remove the node again */
aio_context_acquire(ctx);
blk_remove_bs(blk);
aio_context_release(ctx);
g_assert(blk_get_aio_context(blk) == ctx);
g_assert(bdrv_get_aio_context(bs) == qemu_get_aio_context());
/* Re-attach the node */
aio_context_acquire(main_ctx);
blk_insert_bs(blk, bs, &error_abort);
aio_context_release(main_ctx);
g_assert(blk_get_aio_context(blk) == ctx);
g_assert(bdrv_get_aio_context(bs) == ctx);
aio_context_acquire(ctx);
blk_set_aio_context(blk, qemu_get_aio_context(), &error_abort);
aio_context_release(ctx);
bdrv_unref(bs);
blk_unref(blk);
}

137
tests/unit/test-blockjob.c
View File

@ -228,7 +228,6 @@ static void cancel_common(CancelJob *s)
BlockJob *job = &s->common;
BlockBackend *blk = s->blk;
JobStatus sts = job->job.status;
AioContext *ctx = job->job.aio_context;
job_cancel_sync(&job->job, true);
WITH_JOB_LOCK_GUARD() {
@ -240,9 +239,7 @@ static void cancel_common(CancelJob *s)
job_unref_locked(&job->job);
}
aio_context_acquire(ctx);
destroy_blk(blk);
aio_context_release(ctx);
}
@ -391,132 +388,6 @@ static void test_cancel_concluded(void)
cancel_common(s);
}
/* (See test_yielding_driver for the job description) */
typedef struct YieldingJob {
BlockJob common;
bool should_complete;
} YieldingJob;
static void yielding_job_complete(Job *job, Error **errp)
{
YieldingJob *s = container_of(job, YieldingJob, common.job);
s->should_complete = true;
job_enter(job);
}
static int coroutine_fn yielding_job_run(Job *job, Error **errp)
{
YieldingJob *s = container_of(job, YieldingJob, common.job);
job_transition_to_ready(job);
while (!s->should_complete) {
job_yield(job);
}
return 0;
}
/*
* This job transitions immediately to the READY state, and then
* yields until it is to complete.
*/
static const BlockJobDriver test_yielding_driver = {
.job_driver = {
.instance_size = sizeof(YieldingJob),
.free = block_job_free,
.user_resume = block_job_user_resume,
.run = yielding_job_run,
.complete = yielding_job_complete,
},
};
/*
* Test that job_complete_locked() works even on jobs that are in a paused
* state (i.e., STANDBY).
*
* To do this, run YieldingJob in an IO thread, get it into the READY
* state, then have a drained section. Before ending the section,
* acquire the context so the job will not be entered and will thus
* remain on STANDBY.
*
* job_complete_locked() should still work without error.
*
* Note that on the QMP interface, it is impossible to lock an IO
* thread before a drained section ends. In practice, the
* bdrv_drain_all_end() and the aio_context_acquire() will be
* reversed. However, that makes for worse reproducibility here:
* Sometimes, the job would no longer be in STANDBY then but already
* be started. We cannot prevent that, because the IO thread runs
* concurrently. We can only prevent it by taking the lock before
* ending the drained section, so we do that.
*
* (You can reverse the order of operations and most of the time the
* test will pass, but sometimes the assert(status == STANDBY) will
* fail.)
*/
static void test_complete_in_standby(void)
{
BlockBackend *blk;
IOThread *iothread;
AioContext *ctx;
Job *job;
BlockJob *bjob;
/* Create a test drive, move it to an IO thread */
blk = create_blk(NULL);
iothread = iothread_new();
ctx = iothread_get_aio_context(iothread);
blk_set_aio_context(blk, ctx, &error_abort);
/* Create our test job */
bjob = mk_job(blk, "job", &test_yielding_driver, true,
JOB_MANUAL_FINALIZE | JOB_MANUAL_DISMISS);
job = &bjob->job;
assert_job_status_is(job, JOB_STATUS_CREATED);
/* Wait for the job to become READY */
job_start(job);
/*
* Here we are waiting for the status to change, so don't bother
* protecting the read every time.
*/
AIO_WAIT_WHILE_UNLOCKED(ctx, job->status != JOB_STATUS_READY);
/* Begin the drained section, pausing the job */
bdrv_drain_all_begin();
assert_job_status_is(job, JOB_STATUS_STANDBY);
/* Lock the IO thread to prevent the job from being run */
aio_context_acquire(ctx);
/* This will schedule the job to resume it */
bdrv_drain_all_end();
aio_context_release(ctx);
WITH_JOB_LOCK_GUARD() {
/* But the job cannot run, so it will remain on standby */
assert(job->status == JOB_STATUS_STANDBY);
/* Even though the job is on standby, this should work */
job_complete_locked(job, &error_abort);
/* The test is done now, clean up. */
job_finish_sync_locked(job, NULL, &error_abort);
assert(job->status == JOB_STATUS_PENDING);
job_finalize_locked(job, &error_abort);
assert(job->status == JOB_STATUS_CONCLUDED);
job_dismiss_locked(&job, &error_abort);
}
aio_context_acquire(ctx);
destroy_blk(blk);
aio_context_release(ctx);
iothread_join(iothread);
}
int main(int argc, char **argv)
{
qemu_init_main_loop(&error_abort);
@ -531,13 +402,5 @@ int main(int argc, char **argv)
g_test_add_func("/blockjob/cancel/standby", test_cancel_standby);
g_test_add_func("/blockjob/cancel/pending", test_cancel_pending);
g_test_add_func("/blockjob/cancel/concluded", test_cancel_concluded);
/*
* This test is flaky and sometimes fails in CI and otherwise:
* don't run unless user opts in via environment variable.
*/
if (getenv("QEMU_TEST_FLAKY_TESTS")) {
g_test_add_func("/blockjob/complete_in_standby", test_complete_in_standby);
}
return g_test_run();
}

11
tests/unit/test-replication.c
View File

@ -199,17 +199,13 @@ static BlockBackend *start_primary(void)
static void teardown_primary(void)
{
BlockBackend *blk;
AioContext *ctx;
/* remove P_ID */
blk = blk_by_name(P_ID);
assert(blk);
ctx = blk_get_aio_context(blk);
aio_context_acquire(ctx);
monitor_remove_blk(blk);
blk_unref(blk);
aio_context_release(ctx);
}
static void test_primary_read(void)
@ -345,27 +341,20 @@ static void teardown_secondary(void)
{
/* only need to destroy two BBs */
BlockBackend *blk;
AioContext *ctx;
/* remove S_LOCAL_DISK_ID */
blk = blk_by_name(S_LOCAL_DISK_ID);
assert(blk);
ctx = blk_get_aio_context(blk);
aio_context_acquire(ctx);
monitor_remove_blk(blk);
blk_unref(blk);
aio_context_release(ctx);
/* remove S_ID */
blk = blk_by_name(S_ID);
assert(blk);
ctx = blk_get_aio_context(blk);
aio_context_acquire(ctx);
monitor_remove_blk(blk);
blk_unref(blk);
aio_context_release(ctx);
}
static void test_secondary_read(void)

14
util/async.c
View File

@ -562,12 +562,10 @@ static void co_schedule_bh_cb(void *opaque)
Coroutine *co = QSLIST_FIRST(&straight);
QSLIST_REMOVE_HEAD(&straight, co_scheduled_next);
trace_aio_co_schedule_bh_cb(ctx, co);
aio_context_acquire(ctx);
/* Protected by write barrier in qemu_aio_coroutine_enter */
qatomic_set(&co->scheduled, NULL);
qemu_aio_coroutine_enter(ctx, co);
aio_context_release(ctx);
}
}
@ -707,9 +705,7 @@ void aio_co_enter(AioContext *ctx, Coroutine *co)
assert(self != co);
QSIMPLEQ_INSERT_TAIL(&self->co_queue_wakeup, co, co_queue_next);
} else {
aio_context_acquire(ctx);
qemu_aio_coroutine_enter(ctx, co);
aio_context_release(ctx);
}
}
@ -723,16 +719,6 @@ void aio_context_unref(AioContext *ctx)
g_source_unref(&ctx->source);
}
void aio_context_acquire(AioContext *ctx)
{
qemu_rec_mutex_lock(&ctx->lock);
}
void aio_context_release(AioContext *ctx)
{
qemu_rec_mutex_unlock(&ctx->lock);
}
QEMU_DEFINE_STATIC_CO_TLS(AioContext *, my_aiocontext)
AioContext *qemu_get_current_aio_context(void)

3
util/vhost-user-server.c
View File

@ -360,10 +360,7 @@ static void vu_accept(QIONetListener *listener, QIOChannelSocket *sioc,
qio_channel_set_follow_coroutine_ctx(server->ioc, true);
/* Attaching the AioContext starts the vu_client_trip coroutine */
aio_context_acquire(server->ctx);
vhost_user_server_attach_aio_context(server, server->ctx);
aio_context_release(server->ctx);
}
/* server->ctx acquired by caller */