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authorJeff Cody <jcody@redhat.com>2012-02-28 15:54:06 -0500
committerKevin Wolf <kwolf@redhat.com>2012-02-29 15:48:33 +0100
commit8802d1fdd4b73e02ce13fb3a233c64c1913634ab (patch)
tree30492b35aea065cd13d6ce18073049d7d3435057 /qmp-commands.hx
parent64ca6aee4f06a3af869e5e09f0afeb6721966875 (diff)
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 <jcody@redhat.com> Acked-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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