dm snapshot: add new persistent store option to support overflow

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Commit 76c44f6d80 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: 76c44f6d80 ("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>

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This commit is contained in:

Mike Snitzer 2015-10-08 18:05:41 -04:00

parent 2bffa1503c

commit b0d3cc011e

6 changed files with 37 additions and 18 deletions

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10

Documentation/device-mapper/snapshot.txt

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6

drivers/md/dm-exception-store.c

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5

drivers/md/dm-exception-store.h

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17

drivers/md/dm-snap-persistent.c

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3

drivers/md/dm-snap-transient.c

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14

drivers/md/dm-snap.c

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