From 76c44f6d80e151d230844db7ffc058ac21b9e3f2 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Sun, 21 Jun 2015 16:31:33 -0400 Subject: [PATCH] dm snapshot: don't invalidate on-disk image on snapshot write overflow When the snapshot overflows because of a write to the origin, the on-disk image has to be invalidated. However, when the snapshot overflows because of a write to the snapshot, the on-disk image doesn't have to be invalidated. Change the behavior so that the on-disk image is not invalidated in this case. When the snapshot overflows, the variable snapshot_overflowed is set. All writes to the snapshot are disallowed to minimize filesystem corruption - this condition is cleared when the snapshot is deactivated and activated. The user can extend the overflowed snapshot, deactivate and activate it again, run fsck (if journaling filesystem is not used) mount it and recover the data. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer --- Reading git-format-patch failed