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block: Add permissions to BlockBackend 

The BlockBackend can now store the permissions that its user requires.
This is necessary because nodes can be ejected from or inserted into a
BlockBackend and all of these operations must make sure that the user
still gets what it requested initially.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-01-20 15:42:39 +01:00
parent f68c598be6
commit 981776b348
2 changed files with 29 additions and 0 deletions
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27
block/block-backend.c
View File

@ -59,6 +59,9 @@ struct BlockBackend {
bool iostatus_enabled;
BlockDeviceIoStatus iostatus;
uint64_t perm;
uint64_t shared_perm;
bool allow_write_beyond_eof;
NotifierList remove_bs_notifiers, insert_bs_notifiers;
@ -126,6 +129,8 @@ BlockBackend *blk_new(void)
blk = g_new0(BlockBackend, 1);
blk->refcnt = 1;
blk->perm = 0;
blk->shared_perm = BLK_PERM_ALL;
blk_set_enable_write_cache(blk, true);
qemu_co_queue_init(&blk->public.throttled_reqs[0]);
@ -511,6 +516,27 @@ void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
}
}
/*
* Sets the permission bitmasks that the user of the BlockBackend needs.
*/
int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
Error **errp)
{
int ret;
if (blk->root) {
ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp);
if (ret < 0) {
return ret;
}
}
blk->perm = perm;
blk->shared_perm = shared_perm;
return 0;
}
static int blk_do_attach_dev(BlockBackend *blk, void *dev)
{
if (blk->dev) {
@ -557,6 +583,7 @@ void blk_detach_dev(BlockBackend *blk, void *dev)
blk->dev_ops = NULL;
blk->dev_opaque = NULL;
blk->guest_block_size = 512;
blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort);
blk_unref(blk);
}

2
include/sysemu/block-backend.h
View File

@ -105,6 +105,8 @@ void blk_remove_bs(BlockBackend *blk);
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
bool bdrv_has_blk(BlockDriverState *bs);
bool bdrv_is_root_node(BlockDriverState *bs);
int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
Error **errp);
void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);
void blk_iostatus_enable(BlockBackend *blk);