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block: Fix locking in external_snapshot_prepare()

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bdrv_img_create() polls internally (when calling bdrv_create(), which is
a co_wrapper), so it can't be called while holding the lock of any
AioContext except the current one without causing deadlocks. Drop the
lock around the call in external_snapshot_prepare().

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221207131838.239125-11-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2022-12-07 14:18:30 +01:00
parent 617f3a9635
commit e135505588
2 changed files with 8 additions and 0 deletions
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4
block.c
View File

@ -6924,6 +6924,10 @@ bool bdrv_op_blocker_is_empty(BlockDriverState *bs)
return true;
}
/*
* Must not be called while holding the lock of an AioContext other than the
* current one.
*/
void bdrv_img_create(const char *filename, const char *fmt,
const char *base_filename, const char *base_fmt,
char *options, uint64_t img_size, int flags, bool quiet,

4
blockdev.c
View File

@ -1507,10 +1507,14 @@ static void external_snapshot_prepare(BlkActionState *common,
goto out;
}
bdrv_refresh_filename(state->old_bs);
aio_context_release(aio_context);
bdrv_img_create(new_image_file, format,
state->old_bs->filename,
state->old_bs->drv->format_name,
NULL, size, flags, false, &local_err);
aio_context_acquire(aio_context);
if (local_err) {
error_propagate(errp, local_err);
goto out;