From 8802d1fdd4b73e02ce13fb3a233c64c1913634ab Mon Sep 17 00:00:00 2001 From: Jeff Cody Date: Tue, 28 Feb 2012 15:54:06 -0500 Subject: qapi: Introduce blockdev-group-snapshot-sync command This is a QAPI/QMP only command to take a snapshot of a group of devices. This is similar to the blockdev-snapshot-sync command, except blockdev-group-snapshot-sync accepts a list devices, filenames, and formats. It is attempted to keep the snapshot of the group atomic; if the creation or open of any of the new snapshots fails, then all of the new snapshots are abandoned, and the name of the snapshot image that failed is returned. The failure case should not interrupt any operations. Rather than use bdrv_close() along with a subsequent bdrv_open() to perform the pivot, the original image is never closed and the new image is placed 'in front' of the original image via manipulation of the BlockDriverState fields. Thus, once the new snapshot image has been successfully created, there are no more failure points before pivoting to the new snapshot. This allows the group of disks to remain consistent with each other, even across snapshot failures. Signed-off-by: Jeff Cody Acked-by: Luiz Capitulino Signed-off-by: Kevin Wolf --- block.h | 1 + 1 file changed, 1 insertion(+) (limited to 'block.h') diff --git a/block.h b/block.h index bbc3830..48d0bf3 100644 --- a/block.h +++ b/block.h @@ -114,6 +114,7 @@ int bdrv_create(BlockDriver *drv, const char* filename, int bdrv_create_file(const char* filename, QEMUOptionParameter *options); BlockDriverState *bdrv_new(const char *device_name); void bdrv_make_anon(BlockDriverState *bs); +void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); void bdrv_delete(BlockDriverState *bs); int bdrv_parse_cache_flags(const char *mode, int *flags); int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags); -- cgit v1.1