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Block patches: 

- New debugging QMP command to explore block graphs
 - Converted DPRINTF()s to trace events
 - Fixed qemu-io's use of getopt() for systems with optreset
 - Minor NVMe emulation fixes
 - An iotest fix
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Merge remote-tracking branch 'remotes/xanclic/tags/pull-block-2019-01-31' into staging

Block patches:
- New debugging QMP command to explore block graphs
- Converted DPRINTF()s to trace events
- Fixed qemu-io's use of getopt() for systems with optreset
- Minor NVMe emulation fixes
- An iotest fix

# gpg: Signature made Thu 31 Jan 2019 00:51:46 GMT
# gpg:                using RSA key F407DB0061D5CF40
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>" [full]
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/xanclic/tags/pull-block-2019-01-31:
  iotests: Allow 147 to be run concurrently
  iotests: Bind qemu-nbd to localhost in 147
  iotests.py: Add qemu_nbd_pipe()
  nvme: use pci_dev directly in nvme_realize
  nvme: ensure the num_queues is not zero
  nvme: use TYPE_NVME instead of constant string
  qemu-io: Add generic function for reinitializing optind.
  block/sheepdog: Convert from DPRINTF() macro to trace events
  block/file-posix: Convert from DPRINTF() macro to trace events
  block/curl: Convert from DPRINTF() macro to trace events
  block/ssh: Convert from DPRINTF() macro to trace events
  scripts: add render_block_graph function for QEMUMachine
  qapi: add x-debug-query-block-graph

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2019-01-31 19:26:09 +00:00
parent e8977901b7 908b30164b
commit cfe6c54769
19 changed files with 608 additions and 136 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

148
block.c
View File

@ -4119,6 +4119,154 @@ BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp)
return list;
}
#define QAPI_LIST_ADD(list, element) do { \
typeof(list) _tmp = g_new(typeof(*(list)), 1); \
_tmp->value = (element); \
_tmp->next = (list); \
(list) = _tmp; \
} while (0)
typedef struct XDbgBlockGraphConstructor {
XDbgBlockGraph *graph;
GHashTable *graph_nodes;
} XDbgBlockGraphConstructor;
static XDbgBlockGraphConstructor *xdbg_graph_new(void)
{
XDbgBlockGraphConstructor *gr = g_new(XDbgBlockGraphConstructor, 1);
gr->graph = g_new0(XDbgBlockGraph, 1);
gr->graph_nodes = g_hash_table_new(NULL, NULL);
return gr;
}
static XDbgBlockGraph *xdbg_graph_finalize(XDbgBlockGraphConstructor *gr)
{
XDbgBlockGraph *graph = gr->graph;
g_hash_table_destroy(gr->graph_nodes);
g_free(gr);
return graph;
}
static uintptr_t xdbg_graph_node_num(XDbgBlockGraphConstructor *gr, void *node)
{
uintptr_t ret = (uintptr_t)g_hash_table_lookup(gr->graph_nodes, node);
if (ret != 0) {
return ret;
}
/*
* Start counting from 1, not 0, because 0 interferes with not-found (NULL)
* answer of g_hash_table_lookup.
*/
ret = g_hash_table_size(gr->graph_nodes) + 1;
g_hash_table_insert(gr->graph_nodes, node, (void *)ret);
return ret;
}
static void xdbg_graph_add_node(XDbgBlockGraphConstructor *gr, void *node,
XDbgBlockGraphNodeType type, const char *name)
{
XDbgBlockGraphNode *n;
n = g_new0(XDbgBlockGraphNode, 1);
n->id = xdbg_graph_node_num(gr, node);
n->type = type;
n->name = g_strdup(name);
QAPI_LIST_ADD(gr->graph->nodes, n);
}
static void xdbg_graph_add_edge(XDbgBlockGraphConstructor *gr, void *parent,
const BdrvChild *child)
{
typedef struct {
unsigned int flag;
BlockPermission num;
} PermissionMap;
static const PermissionMap permissions[] = {
{ BLK_PERM_CONSISTENT_READ, BLOCK_PERMISSION_CONSISTENT_READ },
{ BLK_PERM_WRITE, BLOCK_PERMISSION_WRITE },
{ BLK_PERM_WRITE_UNCHANGED, BLOCK_PERMISSION_WRITE_UNCHANGED },
{ BLK_PERM_RESIZE, BLOCK_PERMISSION_RESIZE },
{ BLK_PERM_GRAPH_MOD, BLOCK_PERMISSION_GRAPH_MOD },
{ 0, 0 }
};
const PermissionMap *p;
XDbgBlockGraphEdge *edge;
QEMU_BUILD_BUG_ON(1UL << (ARRAY_SIZE(permissions) - 1) != BLK_PERM_ALL + 1);
edge = g_new0(XDbgBlockGraphEdge, 1);
edge->parent = xdbg_graph_node_num(gr, parent);
edge->child = xdbg_graph_node_num(gr, child->bs);
edge->name = g_strdup(child->name);
for (p = permissions; p->flag; p++) {
if (p->flag & child->perm) {
QAPI_LIST_ADD(edge->perm, p->num);
}
if (p->flag & child->shared_perm) {
QAPI_LIST_ADD(edge->shared_perm, p->num);
}
}
QAPI_LIST_ADD(gr->graph->edges, edge);
}
XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp)
{
BlockBackend *blk;
BlockJob *job;
BlockDriverState *bs;
BdrvChild *child;
XDbgBlockGraphConstructor *gr = xdbg_graph_new();
for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
char *allocated_name = NULL;
const char *name = blk_name(blk);
if (!*name) {
name = allocated_name = blk_get_attached_dev_id(blk);
}
xdbg_graph_add_node(gr, blk, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_BACKEND,
name);
g_free(allocated_name);
if (blk_root(blk)) {
xdbg_graph_add_edge(gr, blk, blk_root(blk));
}
}
for (job = block_job_next(NULL); job; job = block_job_next(job)) {
GSList *el;
xdbg_graph_add_node(gr, job, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_JOB,
job->job.id);
for (el = job->nodes; el; el = el->next) {
xdbg_graph_add_edge(gr, job, (BdrvChild *)el->data);
}
}
QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) {
xdbg_graph_add_node(gr, bs, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_DRIVER,
bs->node_name);
QLIST_FOREACH(child, &bs->children, next) {
xdbg_graph_add_edge(gr, bs, child);
}
}
return xdbg_graph_finalize(gr);
}
BlockDriverState *bdrv_lookup_bs(const char *device,
const char *node_name,
Error **errp)

5
block/block-backend.c
View File

@ -2249,3 +2249,8 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
blk_out->root, off_out,
bytes, read_flags, write_flags);
}
const BdrvChild *blk_root(BlockBackend *blk)
{
return blk->root;
}

29
block/curl.c
View File

@ -32,22 +32,10 @@
#include "crypto/secret.h"
#include <curl/curl.h>
#include "qemu/cutils.h"
#include "trace.h"
// #define DEBUG_CURL
// #define DEBUG_VERBOSE
#ifdef DEBUG_CURL
#define DEBUG_CURL_PRINT 1
#else
#define DEBUG_CURL_PRINT 0
#endif
#define DPRINTF(fmt, ...) \
do { \
if (DEBUG_CURL_PRINT) { \
fprintf(stderr, fmt, ## __VA_ARGS__); \
} \
} while (0)
#if LIBCURL_VERSION_NUM >= 0x071000
/* The multi interface timer callback was introduced in 7.16.0 */
#define NEED_CURL_TIMER_CALLBACK
@ -154,7 +142,7 @@ static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
{
BDRVCURLState *s = opaque;
DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
trace_curl_timer_cb(timeout_ms);
if (timeout_ms == -1) {
timer_del(&s->timer);
} else {
@ -193,7 +181,7 @@ static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
}
socket = NULL;
DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, (int)fd);
trace_curl_sock_cb(action, (int)fd);
switch (action) {
case CURL_POLL_IN:
aio_set_fd_handler(s->aio_context, fd, false,
@ -238,7 +226,7 @@ static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
size_t realsize = size * nmemb;
int i;
DPRINTF("CURL: Just reading %zd bytes\n", realsize);
trace_curl_read_cb(realsize);
if (!s || !s->orig_buf) {
goto read_end;
@ -777,7 +765,7 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
}
}
DPRINTF("CURL: Opening %s\n", file);
trace_curl_open(file);
qemu_co_queue_init(&s->free_state_waitq);
s->aio_context = bdrv_get_aio_context(bs);
s->url = g_strdup(file);
@ -830,7 +818,7 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
"Server does not support 'range' (byte ranges).");
goto out;
}
DPRINTF("CURL: Size = %" PRIu64 "\n", s->len);
trace_curl_open_size(s->len);
qemu_mutex_lock(&s->mutex);
curl_clean_state(state);
@ -908,8 +896,7 @@ static void curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb)
state->acb[0] = acb;
snprintf(state->range, 127, "%" PRIu64 "-%" PRIu64, start, end);
DPRINTF("CURL (AIO): Reading %" PRIu64 " at %" PRIu64 " (%s)\n",
acb->bytes, start, state->range);
trace_curl_setup_preadv(acb->bytes, start, state->range);
curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
curl_multi_add_handle(s->multi, state->curl);
@ -943,7 +930,7 @@ static void curl_close(BlockDriverState *bs)
{
BDRVCURLState *s = bs->opaque;
DPRINTF("CURL: Close\n");
trace_curl_close();
curl_detach_aio_context(bs);
qemu_mutex_destroy(&s->mutex);

25
block/file-posix.c
View File

@ -102,19 +102,7 @@
#include <xfs/xfs.h>
#endif
//#define DEBUG_BLOCK
#ifdef DEBUG_BLOCK
# define DEBUG_BLOCK_PRINT 1
#else
# define DEBUG_BLOCK_PRINT 0
#endif
#define DPRINTF(fmt, ...) \
do { \
if (DEBUG_BLOCK_PRINT) { \
printf(fmt, ## __VA_ARGS__); \
} \
} while (0)
#include "trace.h"
/* OS X does not have O_DSYNC */
#ifndef O_DSYNC
@ -1411,7 +1399,7 @@ static int xfs_write_zeroes(BDRVRawState *s, int64_t offset, uint64_t bytes)
if (xfsctl(NULL, s->fd, XFS_IOC_ZERO_RANGE, &fl) < 0) {
err = errno;
DPRINTF("cannot write zero range (%s)\n", strerror(errno));
trace_file_xfs_write_zeroes(strerror(errno));
return -err;
}
@ -1430,7 +1418,7 @@ static int xfs_discard(BDRVRawState *s, int64_t offset, uint64_t bytes)
if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
err = errno;
DPRINTF("cannot punch hole (%s)\n", strerror(errno));
trace_file_xfs_discard(strerror(errno));
return -err;
}
@ -2819,7 +2807,7 @@ static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator)
/* If a match was found, leave the loop */
if (*mediaIterator != 0) {
DPRINTF("Matching using %s\n", matching_array[index]);
trace_file_FindEjectableOpticalMedia(matching_array[index]);
mediaType = g_strdup(matching_array[index]);
break;
}
@ -2879,7 +2867,7 @@ static bool setup_cdrom(char *bsd_path, Error **errp)
if (partition_found == false) {
error_setg(errp, "Failed to find a working partition on disc");
} else {
DPRINTF("Using %s as optical disc\n", test_partition);
trace_file_setup_cdrom(test_partition);
pstrcpy(bsd_path, MAXPATHLEN, test_partition);
}
return partition_found;
@ -2974,8 +2962,7 @@ static bool hdev_is_sg(BlockDriverState *bs)
ret = ioctl(s->fd, SG_GET_SCSI_ID, &scsiid);
if (ret >= 0) {
DPRINTF("SG device found: type=%d, version=%d\n",
scsiid.scsi_type, sg_version);
trace_file_hdev_is_sg(scsiid.scsi_type, sg_version);
return true;
}

47
block/sheepdog.c
View File

@ -28,6 +28,7 @@
#include "sysemu/block-backend.h"
#include "qemu/bitops.h"
#include "qemu/cutils.h"
#include "trace.h"
#define SD_PROTO_VER 0x01
@ -299,19 +300,6 @@ static inline size_t count_data_objs(const struct SheepdogInode *inode)
(1UL << inode->block_size_shift));
}
#undef DPRINTF
#ifdef DEBUG_SDOG
#define DEBUG_SDOG_PRINT 1
#else
#define DEBUG_SDOG_PRINT 0
#endif
#define DPRINTF(fmt, args...) \
do { \
if (DEBUG_SDOG_PRINT) { \
fprintf(stderr, "%s %d: " fmt, __func__, __LINE__, ##args); \
} \
} while (0)
typedef struct SheepdogAIOCB SheepdogAIOCB;
typedef struct BDRVSheepdogState BDRVSheepdogState;
@ -750,7 +738,7 @@ static coroutine_fn void reconnect_to_sdog(void *opaque)
Error *local_err = NULL;
s->fd = get_sheep_fd(s, &local_err);
if (s->fd < 0) {
DPRINTF("Wait for connection to be established\n");
trace_sheepdog_reconnect_to_sdog();
error_report_err(local_err);
qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 1000000000ULL);
}
@ -847,7 +835,7 @@ static void coroutine_fn aio_read_response(void *opaque)
break;
case AIOCB_FLUSH_CACHE:
if (rsp.result == SD_RES_INVALID_PARMS) {
DPRINTF("disable cache since the server doesn't support it\n");
trace_sheepdog_aio_read_response();
s->cache_flags = SD_FLAG_CMD_DIRECT;
rsp.result = SD_RES_SUCCESS;
}
@ -1639,7 +1627,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
s->discard_supported = true;
if (snap_id || tag[0]) {
DPRINTF("%" PRIx32 " snapshot inode was open.\n", vid);
trace_sheepdog_open(vid);
s->is_snapshot = true;
}
@ -2252,7 +2240,7 @@ static void sd_close(BlockDriverState *bs)
unsigned int wlen, rlen = 0;
int fd, ret;
DPRINTF("%s\n", s->name);
trace_sheepdog_close(s->name);
fd = connect_to_sdog(s, &local_err);
if (fd < 0) {
@ -2429,7 +2417,7 @@ static int sd_create_branch(BDRVSheepdogState *s)
char *buf;
bool deleted;
DPRINTF("%" PRIx32 " is snapshot.\n", s->inode.vdi_id);
trace_sheepdog_create_branch_snapshot(s->inode.vdi_id);
buf = g_malloc(SD_INODE_SIZE);
@ -2445,7 +2433,7 @@ static int sd_create_branch(BDRVSheepdogState *s)
goto out;
}
DPRINTF("%" PRIx32 " is created.\n", vid);
trace_sheepdog_create_branch_created(vid);
fd = connect_to_sdog(s, &local_err);
if (fd < 0) {
@ -2467,7 +2455,7 @@ static int sd_create_branch(BDRVSheepdogState *s)
s->is_snapshot = false;
ret = 0;
DPRINTF("%" PRIx32 " was newly created.\n", s->inode.vdi_id);
trace_sheepdog_create_branch_new(s->inode.vdi_id);
out:
g_free(buf);
@ -2561,11 +2549,11 @@ static void coroutine_fn sd_co_rw_vector(SheepdogAIOCB *acb)
}
if (create) {
DPRINTF("update ino (%" PRIu32 ") %" PRIu64 " %" PRIu64 " %ld\n",
inode->vdi_id, oid,
vid_to_data_oid(inode->data_vdi_id[idx], idx), idx);
trace_sheepdog_co_rw_vector_update(inode->vdi_id, oid,
vid_to_data_oid(inode->data_vdi_id[idx], idx),
idx);
oid = vid_to_data_oid(inode->vdi_id, idx);
DPRINTF("new oid %" PRIx64 "\n", oid);
trace_sheepdog_co_rw_vector_new(oid);
}
aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, create,
@ -2670,9 +2658,8 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
SheepdogInode *inode;
unsigned int datalen;
DPRINTF("sn_info: name %s id_str %s s: name %s vm_state_size %" PRId64 " "
"is_snapshot %d\n", sn_info->name, sn_info->id_str,
s->name, sn_info->vm_state_size, s->is_snapshot);
trace_sheepdog_snapshot_create_info(sn_info->name, sn_info->id_str, s->name,
sn_info->vm_state_size, s->is_snapshot);
if (s->is_snapshot) {
error_report("You can't create a snapshot of a snapshot VDI, "
@ -2681,7 +2668,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
return -EINVAL;
}
DPRINTF("%s %s\n", sn_info->name, sn_info->id_str);
trace_sheepdog_snapshot_create(sn_info->name, sn_info->id_str);
s->inode.vm_state_size = sn_info->vm_state_size;
s->inode.vm_clock_nsec = sn_info->vm_clock_nsec;
@ -2726,8 +2713,8 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
}
memcpy(&s->inode, inode, datalen);
DPRINTF("s->inode: name %s snap_id %x oid %x\n",
s->inode.name, s->inode.snap_id, s->inode.vdi_id);
trace_sheepdog_snapshot_create_inode(s->inode.name, s->inode.snap_id,
s->inode.vdi_id);
cleanup:
g_free(inode);

46
block/ssh.c
View File

@ -41,27 +41,17 @@
#include "qapi/qmp/qstring.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/qobject-output-visitor.h"
#include "trace.h"
/* DEBUG_SSH=1 enables the DPRINTF (debugging printf) statements in
* this block driver code.
*
/*
* TRACE_LIBSSH2=<bitmask> enables tracing in libssh2 itself. Note
* that this requires that libssh2 was specially compiled with the
* `./configure --enable-debug' option, so most likely you will have
* to compile it yourself. The meaning of <bitmask> is described
* here: http://www.libssh2.org/libssh2_trace.html
*/
#define DEBUG_SSH 0
#define TRACE_LIBSSH2 0 /* or try: LIBSSH2_TRACE_SFTP */
#define DPRINTF(fmt, ...) \
do { \
if (DEBUG_SSH) { \
fprintf(stderr, "ssh: %-15s " fmt "\n", \
__func__, ##__VA_ARGS__); \
} \
} while (0)
typedef struct BDRVSSHState {
/* Coroutine. */
CoMutex lock;
@ -336,7 +326,7 @@ static int check_host_key_knownhosts(BDRVSSHState *s,
switch (r) {
case LIBSSH2_KNOWNHOST_CHECK_MATCH:
/* OK */
DPRINTF("host key OK: %s", found->key);
trace_ssh_check_host_key_knownhosts(found->key);
break;
case LIBSSH2_KNOWNHOST_CHECK_MISMATCH:
ret = -EINVAL;
@ -721,8 +711,7 @@ static int connect_to_ssh(BDRVSSHState *s, BlockdevOptionsSsh *opts,
}
/* Open the remote file. */
DPRINTF("opening file %s flags=0x%x creat_mode=0%o",
opts->path, ssh_flags, creat_mode);
trace_ssh_connect_to_ssh(opts->path, ssh_flags, creat_mode);
s->sftp_handle = libssh2_sftp_open(s->sftp, opts->path, ssh_flags,
creat_mode);
if (!s->sftp_handle) {
@ -890,7 +879,7 @@ static int coroutine_fn ssh_co_create_opts(const char *filename, QemuOpts *opts,
/* Get desired file size. */
ssh_opts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
DPRINTF("total_size=%" PRIi64, ssh_opts->size);
trace_ssh_co_create_opts(ssh_opts->size);
uri_options = qdict_new();
ret = parse_uri(filename, uri_options, errp);
@ -946,7 +935,7 @@ static void restart_coroutine(void *opaque)
BDRVSSHState *s = bs->opaque;
AioContext *ctx = bdrv_get_aio_context(bs);
DPRINTF("co=%p", restart->co);
trace_ssh_restart_coroutine(restart->co);
aio_set_fd_handler(ctx, s->sock, false, NULL, NULL, NULL, NULL);
aio_co_wake(restart->co);
@ -974,13 +963,12 @@ static coroutine_fn void co_yield(BDRVSSHState *s, BlockDriverState *bs)
wr_handler = restart_coroutine;
}
DPRINTF("s->sock=%d rd_handler=%p wr_handler=%p", s->sock,
rd_handler, wr_handler);
trace_ssh_co_yield(s->sock, rd_handler, wr_handler);
aio_set_fd_handler(bdrv_get_aio_context(bs), s->sock,
false, rd_handler, wr_handler, NULL, &restart);
qemu_coroutine_yield();
DPRINTF("s->sock=%d - back", s->sock);
trace_ssh_co_yield_back(s->sock);
}
/* SFTP has a function `libssh2_sftp_seek64' which seeks to a position
@ -1003,7 +991,7 @@ static void ssh_seek(BDRVSSHState *s, int64_t offset, int flags)
bool force = (flags & SSH_SEEK_FORCE) != 0;
if (force || op_read != s->offset_op_read || offset != s->offset) {
DPRINTF("seeking to offset=%" PRIi64, offset);
trace_ssh_seek(offset);
libssh2_sftp_seek64(s->sftp_handle, offset);
s->offset = offset;
s->offset_op_read = op_read;
@ -1019,7 +1007,7 @@ static coroutine_fn int ssh_read(BDRVSSHState *s, BlockDriverState *bs,
char *buf, *end_of_vec;
struct iovec *i;
DPRINTF("offset=%" PRIi64 " size=%zu", offset, size);
trace_ssh_read(offset, size);
ssh_seek(s, offset, SSH_SEEK_READ);
@ -1038,9 +1026,9 @@ static coroutine_fn int ssh_read(BDRVSSHState *s, BlockDriverState *bs,
*/
for (got = 0; got < size; ) {
again:
DPRINTF("sftp_read buf=%p size=%zu", buf, end_of_vec - buf);
trace_ssh_read_buf(buf, end_of_vec - buf);
r = libssh2_sftp_read(s->sftp_handle, buf, end_of_vec - buf);
DPRINTF("sftp_read returned %zd", r);
trace_ssh_read_return(r);
if (r == LIBSSH2_ERROR_EAGAIN || r == LIBSSH2_ERROR_TIMEOUT) {
co_yield(s, bs);
@ -1094,7 +1082,7 @@ static int ssh_write(BDRVSSHState *s, BlockDriverState *bs,
char *buf, *end_of_vec;
struct iovec *i;
DPRINTF("offset=%" PRIi64 " size=%zu", offset, size);
trace_ssh_write(offset, size);
ssh_seek(s, offset, SSH_SEEK_WRITE);
@ -1108,9 +1096,9 @@ static int ssh_write(BDRVSSHState *s, BlockDriverState *bs,
for (written = 0; written < size; ) {
again:
DPRINTF("sftp_write buf=%p size=%zu", buf, end_of_vec - buf);
trace_ssh_write_buf(buf, end_of_vec - buf);
r = libssh2_sftp_write(s->sftp_handle, buf, end_of_vec - buf);
DPRINTF("sftp_write returned %zd", r);
trace_ssh_write_return(r);
if (r == LIBSSH2_ERROR_EAGAIN || r == LIBSSH2_ERROR_TIMEOUT) {
co_yield(s, bs);
@ -1187,7 +1175,7 @@ static coroutine_fn int ssh_flush(BDRVSSHState *s, BlockDriverState *bs)
{
int r;
DPRINTF("fsync");
trace_ssh_flush();
again:
r = libssh2_sftp_fsync(s->sftp_handle);
if (r == LIBSSH2_ERROR_EAGAIN || r == LIBSSH2_ERROR_TIMEOUT) {
@ -1238,7 +1226,7 @@ static int64_t ssh_getlength(BlockDriverState *bs)
/* Note we cannot make a libssh2 call here. */
length = (int64_t) s->attrs.filesize;
DPRINTF("length=%" PRIi64, length);
trace_ssh_getlength(length);
return length;
}

47
block/trace-events
View File

@ -160,3 +160,50 @@ iscsi_xcopy(void *src_lun, uint64_t src_off, void *dst_lun, uint64_t dst_off, ui
# block/nbd-client.c
nbd_read_reply_entry_fail(int ret, const char *err) "ret = %d, err: %s"
nbd_co_request_fail(uint64_t from, uint32_t len, uint64_t handle, uint16_t flags, uint16_t type, const char *name, int ret, const char *err) "Request failed { .from = %" PRIu64", .len = %" PRIu32 ", .handle = %" PRIu64 ", .flags = 0x%" PRIx16 ", .type = %" PRIu16 " (%s) } ret = %d, err: %s"
# block/ssh.c
ssh_restart_coroutine(void *co) "co=%p"
ssh_flush(void) "fsync"
ssh_check_host_key_knownhosts(const char *key) "host key OK: %s"
ssh_connect_to_ssh(char *path, int flags, int mode) "opening file %s flags=0x%x creat_mode=0%o"
ssh_co_yield(int sock, void *rd_handler, void *wr_handler) "s->sock=%d rd_handler=%p wr_handler=%p"
ssh_co_yield_back(int sock) "s->sock=%d - back"
ssh_getlength(int64_t length) "length=%" PRIi64
ssh_co_create_opts(uint64_t size) "total_size=%" PRIu64
ssh_read(int64_t offset, size_t size) "offset=%" PRIi64 " size=%zu"
ssh_read_buf(void *buf, size_t size) "sftp_read buf=%p size=%zu"
ssh_read_return(ssize_t ret) "sftp_read returned %zd"
ssh_write(int64_t offset, size_t size) "offset=%" PRIi64 " size=%zu"
ssh_write_buf(void *buf, size_t size) "sftp_write buf=%p size=%zu"
ssh_write_return(ssize_t ret) "sftp_write returned %zd"
ssh_seek(int64_t offset) "seeking to offset=%" PRIi64
# block/curl.c
curl_timer_cb(long timeout_ms) "timer callback timeout_ms %ld"
curl_sock_cb(int action, int fd) "sock action %d on fd %d"
curl_read_cb(size_t realsize) "just reading %zu bytes"
curl_open(const char *file) "opening %s"
curl_open_size(uint64_t size) "size = %" PRIu64
curl_setup_preadv(uint64_t bytes, uint64_t start, const char *range) "reading %" PRIu64 " at %" PRIu64 " (%s)"
curl_close(void) "close"
# block/file-posix.c
file_xfs_write_zeroes(const char *error) "cannot write zero range (%s)"
file_xfs_discard(const char *error) "cannot punch hole (%s)"
file_FindEjectableOpticalMedia(const char *media) "Matching using %s"
file_setup_cdrom(const char *partition) "Using %s as optical disc"
file_hdev_is_sg(int type, int version) "SG device found: type=%d, version=%d"
# block/sheepdog.c
sheepdog_reconnect_to_sdog(void) "Wait for connection to be established"
sheepdog_aio_read_response(void) "disable cache since the server doesn't support it"
sheepdog_open(uint32_t vid) "0x%" PRIx32 " snapshot inode was open"
sheepdog_close(const char *name) "%s"
sheepdog_create_branch_snapshot(uint32_t vdi) "0x%" PRIx32 " is snapshot"
sheepdog_create_branch_created(uint32_t vdi) "0x%" PRIx32 " is created"
sheepdog_create_branch_new(uint32_t vdi) "0x%" PRIx32 " was newly created"
sheepdog_co_rw_vector_update(uint32_t vdi, uint64_t oid, uint64_t data, long idx) "update ino (%" PRIu32 ") %" PRIu64 " %" PRIu64 " %ld"
sheepdog_co_rw_vector_new(uint64_t oid) "new oid 0x%" PRIx64
sheepdog_snapshot_create_info(const char *sn_name, const char *id, const char *name, int64_t size, int is_snapshot) "sn_info: name %s id_str %s s: name %s vm_state_size %" PRId64 " " "is_snapshot %d"
sheepdog_snapshot_create(const char *sn_name, const char *id) "%s %s"
sheepdog_snapshot_create_inode(const char *name, uint32_t snap, uint32_t vdi) "s->inode: name %s snap_id 0x%" PRIx32 " vdi 0x%" PRIx32

5
blockdev.c
View File

@ -3582,6 +3582,11 @@ BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
return bdrv_named_nodes_list(errp);
}
XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
{
return bdrv_get_xdbg_block_graph(errp);
}
BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
Error **errp)
{

14
configure vendored
View File

@ -4269,6 +4269,17 @@ if compile_prog "" "" ; then
signalfd=yes
fi
# check if optreset global is declared by <getopt.h>
optreset="no"
cat > $TMPC << EOF
#include <getopt.h>
int main(void) { return optreset; }
EOF
if compile_prog "" "" ; then
optreset=yes
fi
# check if eventfd is supported
eventfd=no
cat > $TMPC << EOF
@ -6643,6 +6654,9 @@ fi
if test "$signalfd" = "yes" ; then
echo "CONFIG_SIGNALFD=y" >> $config_host_mak
fi
if test "$optreset" = "yes" ; then
echo "HAVE_OPTRESET=y" >> $config_host_mak
fi
if test "$tcg" = "yes"; then
echo "CONFIG_TCG=y" >> $config_host_mak
if test "$tcg_interpreter" = "yes" ; then

15
hw/block/nvme.c
View File

@ -1208,6 +1208,11 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
int64_t bs_size;
uint8_t *pci_conf;
if (!n->num_queues) {
error_setg(errp, "num_queues can't be zero");
return;
}
if (!n->conf.blk) {
error_setg(errp, "drive property not set");
return;
@ -1233,7 +1238,7 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
pci_conf[PCI_INTERRUPT_PIN] = 1;
pci_config_set_prog_interface(pci_dev->config, 0x2);
pci_config_set_class(pci_dev->config, PCI_CLASS_STORAGE_EXPRESS);
pcie_endpoint_cap_init(&n->parent_obj, 0x80);
pcie_endpoint_cap_init(pci_dev, 0x80);
n->num_namespaces = 1;
n->reg_size = pow2ceil(0x1004 + 2 * (n->num_queues + 1) * 4);
@ -1245,10 +1250,10 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
memory_region_init_io(&n->iomem, OBJECT(n), &nvme_mmio_ops, n,
"nvme", n->reg_size);
pci_register_bar(&n->parent_obj, 0,
pci_register_bar(pci_dev, 0,
PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64,
&n->iomem);
msix_init_exclusive_bar(&n->parent_obj, n->num_queues, 4, NULL);
msix_init_exclusive_bar(pci_dev, n->num_queues, 4, NULL);
id->vid = cpu_to_le16(pci_get_word(pci_conf + PCI_VENDOR_ID));
id->ssvid = cpu_to_le16(pci_get_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID));
@ -1303,7 +1308,7 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
n->cmbuf = g_malloc0(NVME_CMBSZ_GETSIZE(n->bar.cmbsz));
memory_region_init_io(&n->ctrl_mem, OBJECT(n), &nvme_cmb_ops, n,
"nvme-cmb", NVME_CMBSZ_GETSIZE(n->bar.cmbsz));
pci_register_bar(&n->parent_obj, NVME_CMBLOC_BIR(n->bar.cmbloc),
pci_register_bar(pci_dev, NVME_CMBLOC_BIR(n->bar.cmbloc),
PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64 |
PCI_BASE_ADDRESS_MEM_PREFETCH, &n->ctrl_mem);
@ -1381,7 +1386,7 @@ static void nvme_instance_init(Object *obj)
}
static const TypeInfo nvme_info = {
.name = "nvme",
.name = TYPE_NVME,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(NvmeCtrl),
.class_init = nvme_class_init,

1
include/block/block.h
View File

@ -448,6 +448,7 @@ void bdrv_eject(BlockDriverState *bs, bool eject_flag);
const char *bdrv_get_format_name(BlockDriverState *bs);
BlockDriverState *bdrv_find_node(const char *node_name);
BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp);
XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp);
BlockDriverState *bdrv_lookup_bs(const char *device,
const char *node_name,
Error **errp);

16
include/qemu/osdep.h
View File

@ -109,6 +109,7 @@ extern int daemon(int, int);
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <assert.h>
@ -604,4 +605,19 @@ extern int qemu_icache_linesize_log;
extern int qemu_dcache_linesize;
extern int qemu_dcache_linesize_log;
/*
* After using getopt or getopt_long, if you need to parse another set
* of options, then you must reset optind. Unfortunately the way to
* do this varies between implementations of getopt.
*/
static inline void qemu_reset_optind(void)
{
#ifdef HAVE_OPTRESET
optind = 1;
optreset = 1;
#else
optind = 0;
#endif
}
#endif

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

@ -237,4 +237,6 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
int bytes, BdrvRequestFlags read_flags,
BdrvRequestFlags write_flags);
const BdrvChild *blk_root(BlockBackend *blk);
#endif

108
qapi/block-core.json
View File

@ -1665,6 +1665,114 @@
##
{ 'command': 'query-named-block-nodes', 'returns': [ 'BlockDeviceInfo' ] }
##
# @XDbgBlockGraphNodeType:
#
# @block-backend: corresponds to BlockBackend
#
# @block-job: corresonds to BlockJob
#
# @block-driver: corresponds to BlockDriverState
#
# Since: 4.0
##
{ 'enum': 'XDbgBlockGraphNodeType',
'data': [ 'block-backend', 'block-job', 'block-driver' ] }
##
# @XDbgBlockGraphNode:
#
# @id: Block graph node identifier. This @id is generated only for
# x-debug-query-block-graph and does not relate to any other identifiers in
# Qemu.
#
# @type: Type of graph node. Can be one of block-backend, block-job or
# block-driver-state.
#
# @name: Human readable name of the node. Corresponds to node-name for
# block-driver-state nodes; is not guaranteed to be unique in the whole
# graph (with block-jobs and block-backends).
#
# Since: 4.0
##
{ 'struct': 'XDbgBlockGraphNode',
'data': { 'id': 'uint64', 'type': 'XDbgBlockGraphNodeType', 'name': 'str' } }
##
# @BlockPermission:
#
# Enum of base block permissions.
#
# @consistent-read: A user that has the "permission" of consistent reads is
# guaranteed that their view of the contents of the block
# device is complete and self-consistent, representing the
# contents of a disk at a specific point.
# For most block devices (including their backing files) this
# is true, but the property cannot be maintained in a few
# situations like for intermediate nodes of a commit block
# job.
#
# @write: This permission is required to change the visible disk contents.
#
# @write-unchanged: This permission (which is weaker than BLK_PERM_WRITE) is
# both enough and required for writes to the block node when
# the caller promises that the visible disk content doesn't
# change.
# As the BLK_PERM_WRITE permission is strictly stronger,
# either is sufficient to perform an unchanging write.
#
# @resize: This permission is required to change the size of a block node.
#
# @graph-mod: This permission is required to change the node that this
# BdrvChild points to.
#
# Since: 4.0
##
{ 'enum': 'BlockPermission',
'data': [ 'consistent-read', 'write', 'write-unchanged', 'resize',
'graph-mod' ] }
##
# @XDbgBlockGraphEdge:
#
# Block Graph edge description for x-debug-query-block-graph.
#
# @parent: parent id
#
# @child: child id
#
# @name: name of the relation (examples are 'file' and 'backing')
#
# @perm: granted permissions for the parent operating on the child
#
# @shared-perm: permissions that can still be granted to other users of the
# child while it is still attached to this parent
#
# Since: 4.0
##
{ 'struct': 'XDbgBlockGraphEdge',
'data': { 'parent': 'uint64', 'child': 'uint64',
'name': 'str', 'perm': [ 'BlockPermission' ],
'shared-perm': [ 'BlockPermission' ] } }
##
# @XDbgBlockGraph:
#
# Block Graph - list of nodes and list of edges.
#
# Since: 4.0
##
{ 'struct': 'XDbgBlockGraph',
'data': { 'nodes': ['XDbgBlockGraphNode'], 'edges': ['XDbgBlockGraphEdge'] } }
##
# @x-debug-query-block-graph:
#
# Get the block graph.
#
# Since: 4.0
##
{ 'command': 'x-debug-query-block-graph', 'returns': 'XDbgBlockGraph' }
##
# @drive-mirror:
#

2
qemu-img.c
View File

@ -4962,7 +4962,7 @@ int main(int argc, char **argv)
return 0;
}
argv += optind;
optind = 0;
qemu_reset_optind();
if (!trace_init_backends()) {
exit(1);

2
qemu-io-cmds.c
View File

@ -114,7 +114,7 @@ static int command(BlockBackend *blk, const cmdinfo_t *ct, int argc,
}
}
optind = 0;
qemu_reset_optind();
return ct->cfunc(blk, argc, argv);
}

120
scripts/render_block_graph.py Executable file
View File

@ -0,0 +1,120 @@
#!/usr/bin/env python
#
# Render Qemu Block Graph
#
# Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved.
#
# 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/>.
#
import os
import sys
import subprocess
import json
from graphviz import Digraph
from qemu import MonitorResponseError
def perm(arr):
s = 'w' if 'write' in arr else '_'
s += 'r' if 'consistent-read' in arr else '_'
s += 'u' if 'write-unchanged' in arr else '_'
s += 'g' if 'graph-mod' in arr else '_'
s += 's' if 'resize' in arr else '_'
return s
def render_block_graph(qmp, filename, format='png'):
'''
Render graph in text (dot) representation into "@filename" and
representation in @format into "@filename.@format"
'''
bds_nodes = qmp.command('query-named-block-nodes')
bds_nodes = {n['node-name']: n for n in bds_nodes}
job_nodes = qmp.command('query-block-jobs')
job_nodes = {n['device']: n for n in job_nodes}
block_graph = qmp.command('x-debug-query-block-graph')
graph = Digraph(comment='Block Nodes Graph')
graph.format = format
graph.node('permission symbols:\l'
' w - Write\l'
' r - consistent-Read\l'
' u - write - Unchanged\l'
' g - Graph-mod\l'
' s - reSize\l'
'edge label scheme:\l'
' <child type>\l'
' <perm>\l'
' <shared_perm>\l', shape='none')
for n in block_graph['nodes']:
if n['type'] == 'block-driver':
info = bds_nodes[n['name']]
label = n['name'] + ' [' + info['drv'] + ']'
if info['drv'] == 'file':
label += '\n' + os.path.basename(info['file'])
shape = 'ellipse'
elif n['type'] == 'block-job':
info = job_nodes[n['name']]
label = info['type'] + ' job (' + n['name'] + ')'
shape = 'box'
else:
assert n['type'] == 'block-backend'
label = n['name'] if n['name'] else 'unnamed blk'
shape = 'box'
graph.node(str(n['id']), label, shape=shape)
for e in block_graph['edges']:
label = '%s\l%s\l%s\l' % (e['name'], perm(e['perm']),
perm(e['shared-perm']))
graph.edge(str(e['parent']), str(e['child']), label=label)
graph.render(filename)
class LibvirtGuest():
def __init__(self, name):
self.name = name
def command(self, cmd):
# only supports qmp commands without parameters
m = {'execute': cmd}
ar = ['virsh', 'qemu-monitor-command', self.name, json.dumps(m)]
reply = json.loads(subprocess.check_output(ar))
if 'error' in reply:
raise MonitorResponseError(reply)
return reply['return']
if __name__ == '__main__':
obj = sys.argv[1]
out = sys.argv[2]
if os.path.exists(obj):
# assume unix socket
qmp = QEMUMonitorProtocol(obj)
qmp.connect()
else:
# assume libvirt guest name
qmp = LibvirtGuest(obj)
render_block_graph(qmp, out)

98
tests/qemu-iotests/147
View File

@ -19,13 +19,17 @@
#
import os
import random
import socket
import stat
import time
import iotests
from iotests import cachemode, imgfmt, qemu_img, qemu_nbd
from iotests import cachemode, imgfmt, qemu_img, qemu_nbd, qemu_nbd_pipe
NBD_PORT = 10811
NBD_PORT_START = 32768
NBD_PORT_END = NBD_PORT_START + 1024
NBD_IPV6_PORT_START = NBD_PORT_END
NBD_IPV6_PORT_END = NBD_IPV6_PORT_START + 1024
test_img = os.path.join(iotests.test_dir, 'test.img')
unix_socket = os.path.join(iotests.test_dir, 'nbd.socket')
@ -88,17 +92,29 @@ class QemuNBD(NBDBlockdevAddBase):
except OSError:
pass
def _try_server_up(self, *args):
status, msg = qemu_nbd_pipe('-f', imgfmt, test_img, *args)
if status == 0:
return True
if 'Address already in use' in msg:
return False
self.fail(msg)
def _server_up(self, *args):
self.assertEqual(qemu_nbd('-f', imgfmt, test_img, *args), 0)
self.assertTrue(self._try_server_up(*args))
def test_inet(self):
self._server_up('-p', str(NBD_PORT))
while True:
nbd_port = random.randrange(NBD_PORT_START, NBD_PORT_END)
if self._try_server_up('-b', 'localhost', '-p', str(nbd_port)):
break
address = { 'type': 'inet',
'data': {
'host': 'localhost',
'port': str(NBD_PORT)
'port': str(nbd_port)
} }
self.client_test('nbd://localhost:%i' % NBD_PORT,
self.client_test('nbd://localhost:%i' % nbd_port,
flatten_sock_addr(address))
def test_unix(self):
@ -130,8 +146,13 @@ class BuiltinNBD(NBDBlockdevAddBase):
except OSError:
pass
def _server_up(self, address, export_name=None, export_name2=None):
# Returns False on EADDRINUSE; fails an assertion on other errors.
# Returns True on success.
def _try_server_up(self, address, export_name=None, export_name2=None):
result = self.server.qmp('nbd-server-start', addr=address)
if 'error' in result and \
'Address already in use' in result['error']['desc']:
return False
self.assert_qmp(result, 'return', {})
if export_name is None:
@ -146,20 +167,28 @@ class BuiltinNBD(NBDBlockdevAddBase):
name=export_name2)
self.assert_qmp(result, 'return', {})
return True
def _server_up(self, address, export_name=None, export_name2=None):
self.assertTrue(self._try_server_up(address, export_name, export_name2))
def _server_down(self):
result = self.server.qmp('nbd-server-stop')
self.assert_qmp(result, 'return', {})
def do_test_inet(self, export_name=None):
address = { 'type': 'inet',
'data': {
'host': 'localhost',
'port': str(NBD_PORT)
} }
self._server_up(address, export_name)
while True:
nbd_port = random.randrange(NBD_PORT_START, NBD_PORT_END)
address = { 'type': 'inet',
'data': {
'host': 'localhost',
'port': str(nbd_port)
} }
if self._try_server_up(address, export_name):
break
export_name = export_name or 'nbd-export'
self.client_test('nbd://localhost:%i/%s' % (NBD_PORT, export_name),
self.client_test('nbd://localhost:%i/%s' % (nbd_port, export_name),
flatten_sock_addr(address), export_name)
self._server_down()
@ -173,15 +202,19 @@ class BuiltinNBD(NBDBlockdevAddBase):
self.do_test_inet('shadow')
def test_inet_two_exports(self):
address = { 'type': 'inet',
'data': {
'host': 'localhost',
'port': str(NBD_PORT)
} }
self._server_up(address, 'exp1', 'exp2')
self.client_test('nbd://localhost:%i/%s' % (NBD_PORT, 'exp1'),
while True:
nbd_port = random.randrange(NBD_PORT_START, NBD_PORT_END)
address = { 'type': 'inet',
'data': {
'host': 'localhost',
'port': str(nbd_port)
} }
if self._try_server_up(address, 'exp1', 'exp2'):
break
self.client_test('nbd://localhost:%i/%s' % (nbd_port, 'exp1'),
flatten_sock_addr(address), 'exp1', 'node1', False)
self.client_test('nbd://localhost:%i/%s' % (NBD_PORT, 'exp2'),
self.client_test('nbd://localhost:%i/%s' % (nbd_port, 'exp2'),
flatten_sock_addr(address), 'exp2', 'node2', False)
result = self.vm.qmp('blockdev-del', node_name='node1')
self.assert_qmp(result, 'return', {})
@ -197,20 +230,25 @@ class BuiltinNBD(NBDBlockdevAddBase):
except socket.gaierror:
# IPv6 not available, skip
return
address = { 'type': 'inet',
'data': {
'host': '::1',
'port': str(NBD_PORT),
'ipv4': False,
'ipv6': True
} }
while True:
nbd_port = random.randrange(NBD_IPV6_PORT_START, NBD_IPV6_PORT_END)
address = { 'type': 'inet',
'data': {
'host': '::1',
'port': str(nbd_port),
'ipv4': False,
'ipv6': True
} }
if self._try_server_up(address):
break
filename = { 'driver': 'raw',
'file': {
'driver': 'nbd',
'export': 'nbd-export',
'server': flatten_sock_addr(address)
} }
self._server_up(address)
self.client_test(filename, flatten_sock_addr(address), 'nbd-export')
self._server_down()

14
tests/qemu-iotests/iotests.py
View File

@ -201,6 +201,20 @@ def qemu_nbd(*args):
'''Run qemu-nbd in daemon mode and return the parent's exit code'''
return subprocess.call(qemu_nbd_args + ['--fork'] + list(args))
def qemu_nbd_pipe(*args):
'''Run qemu-nbd in daemon mode and return both the parent's exit code
and its output'''
subp = subprocess.Popen(qemu_nbd_args + ['--fork'] + list(args),
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True)
exitcode = subp.wait()
if exitcode < 0:
sys.stderr.write('qemu-nbd received signal %i: %s\n' %
(-exitcode,
' '.join(qemu_nbd_args + ['--fork'] + list(args))))
return exitcode, subp.communicate()[0]
def compare_images(img1, img2, fmt1=imgfmt, fmt2=imgfmt):
'''Return True if two image files are identical'''
return qemu_img('compare', '-f', fmt1,