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qcow2: mark various functions as coroutine_fn and GRAPH_RDLOCK

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Functions that can do I/O (including calling bdrv_is_allocated
and bdrv_block_status functions) are prime candidates for being
coroutine_fns.  Make the change for those that are themselves called
only from coroutine_fns.  Also annotate that they are called with the
graph rdlock taken, thus allowing them to call bdrv_co_*() functions
for I/O.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20230309084456.304669-9-pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-09 09:44:55 +01:00 • committed by Kevin Wolf
parent 10bf10a8e3
commit a39bae4ecd
6 changed files with 53 additions and 45 deletions
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25
block/qcow2-snapshot.c
View file

@ -77,10 +77,11 @@ void qcow2_free_snapshots(BlockDriverState *bs)
* qcow2_check_refcounts() does not do anything with snapshots'
* extra data.)
*/
static int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
int *nb_clusters_reduced,
int *extra_data_dropped,
Error **errp)
static coroutine_fn GRAPH_RDLOCK
int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
int *nb_clusters_reduced,
int *extra_data_dropped,
Error **errp)
{
BDRVQcow2State *s = bs->opaque;
QCowSnapshotHeader h;
@ -108,7 +109,7 @@ static int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
/* Read statically sized part of the snapshot header */
offset = ROUND_UP(offset, 8);
ret = bdrv_pread(bs->file, offset, sizeof(h), &h, 0);
ret = bdrv_co_pread(bs->file, offset, sizeof(h), &h, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
@ -146,8 +147,8 @@ static int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
}
/* Read known extra data */
ret = bdrv_pread(bs->file, offset,
MIN(sizeof(extra), sn->extra_data_size), &extra, 0);
ret = bdrv_co_pread(bs->file, offset,
MIN(sizeof(extra), sn->extra_data_size), &extra, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
@ -184,8 +185,8 @@ static int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
/* Store unknown extra data */
unknown_extra_data_size = sn->extra_data_size - sizeof(extra);
sn->unknown_extra_data = g_malloc(unknown_extra_data_size);
ret = bdrv_pread(bs->file, offset, unknown_extra_data_size,
sn->unknown_extra_data, 0);
ret = bdrv_co_pread(bs->file, offset, unknown_extra_data_size,
sn->unknown_extra_data, 0);
if (ret < 0) {
error_setg_errno(errp, -ret,
"Failed to read snapshot table");
@ -196,7 +197,7 @@ static int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
/* Read snapshot ID */
sn->id_str = g_malloc(id_str_size + 1);
ret = bdrv_pread(bs->file, offset, id_str_size, sn->id_str, 0);
ret = bdrv_co_pread(bs->file, offset, id_str_size, sn->id_str, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
@ -206,7 +207,7 @@ static int qcow2_do_read_snapshots(BlockDriverState *bs, bool repair,
/* Read snapshot name */
sn->name = g_malloc(name_size + 1);
ret = bdrv_pread(bs->file, offset, name_size, sn->name, 0);
ret = bdrv_co_pread(bs->file, offset, name_size, sn->name, 0);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to read snapshot table");
goto fail;
@ -261,7 +262,7 @@ fail:
return ret;
}
int qcow2_read_snapshots(BlockDriverState *bs, Error **errp)
int coroutine_fn qcow2_read_snapshots(BlockDriverState *bs, Error **errp)
{
return qcow2_do_read_snapshots(bs, false, NULL, NULL, errp);
}