]> git.baikalelectronics.ru Git - kernel.git/commit
dm snapshot: add new persistent store option to support overflow
authorMike Snitzer <snitzer@redhat.com>
Thu, 8 Oct 2015 22:05:41 +0000 (18:05 -0400)
committerMike Snitzer <snitzer@redhat.com>
Fri, 9 Oct 2015 20:57:03 +0000 (16:57 -0400)
commit5606a759f47303ddba399cffa886c38b7aeaa711
treed74330dcf71a599d637a7eecad8b56cdbd4487b9
parent708caa4bfc6297f06fc16d2a61cd3e5eb3b99a61
dm snapshot: add new persistent store option to support overflow

Commit da8ebe7b8a introduced the possibly for "Overflow" to be reported
by the snapshot device's status.  Older userspace (e.g. lvm2) does not
handle the "Overflow" status response.

Fix this incompatibility by requiring newer userspace code, that can
cope with "Overflow", request the persistent store with overflow support
by using "PO" (Persistent with Overflow) for the snapshot store type.

Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
Fixes: da8ebe7b8a ("dm snapshot: don't invalidate on-disk image on snapshot write overflow")
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Documentation/device-mapper/snapshot.txt
drivers/md/dm-exception-store.c
drivers/md/dm-exception-store.h
drivers/md/dm-snap-persistent.c
drivers/md/dm-snap-transient.c
drivers/md/dm-snap.c