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snapshot: create bdrv_all_goto_snapshot helper

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to switch to snapshot on all loaded block drivers.

The patch also ensures proper locking.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Denis V. Lunev 2015-11-19 09:42:04 +03:00 • committed by Juan Quintela
parent 9b00ea376d
commit 4c1cdbaad0
3 changed files with 26 additions and 10 deletions
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20
block/snapshot.c
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@ -403,3 +403,23 @@ int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bad_bs,
*first_bad_bs = bs;
return ret;
}
int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs)
{
int err = 0;
BlockDriverState *bs = NULL;
while (err == 0 && (bs = bdrv_next(bs))) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (bdrv_can_snapshot(bs)) {
err = bdrv_snapshot_goto(bs, name);
}
aio_context_release(ctx);
}
*first_bad_bs = bs;
return err;
}