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authorMilan Broz <mbroz@redhat.com>2007-07-12 18:28:13 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-13 00:01:08 +0200
commit0764147b111b8ca886e4f2e9c9e019106b09b657 (patch)
tree815c9d80c961d54c79692ebe4751318c9052ad45 /drivers/md/dm-snap.c
parentdm snapshot: fix invalidation deadlock (diff)
downloadlinux-0764147b111b8ca886e4f2e9c9e019106b09b657.tar.xz
linux-0764147b111b8ca886e4f2e9c9e019106b09b657.zip
dm snapshot: permit invalid activation
Allow invalid snapshots to be activated instead of failing. This allows userspace to reinstate any given snapshot state - for example after an unscheduled reboot - and clean up the invalid snapshot at its leisure. Cc: stable@kernel.org Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r--drivers/md/dm-snap.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 1da41229fbf2..854891d07b59 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -523,9 +523,12 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
/* Metadata must only be loaded into one table at once */
r = s->store.read_metadata(&s->store);
- if (r) {
+ if (r < 0) {
ti->error = "Failed to read snapshot metadata";
goto bad6;
+ } else if (r > 0) {
+ s->valid = 0;
+ DMWARN("Snapshot is marked invalid.");
}
bio_list_init(&s->queued_bios);