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authorMilan Broz <mbroz@redhat.com>2007-07-12 17:28:13 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 15:01:08 -0700
commit0764147b111b8ca886e4f2e9c9e019106b09b657 (patch)
tree815c9d80c961d54c79692ebe4751318c9052ad45 /drivers/md
parentfcac03abd325e4f7a4cc8fe05fea2793b1c8eb75 (diff)
downloadop-kernel-dev-0764147b111b8ca886e4f2e9c9e019106b09b657.zip
op-kernel-dev-0764147b111b8ca886e4f2e9c9e019106b09b657.tar.gz
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')
-rw-r--r--drivers/md/dm-exception-store.c11
-rw-r--r--drivers/md/dm-snap.c5
2 files changed, 10 insertions, 6 deletions
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 8c25c2f..3d65917 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -489,11 +489,6 @@ static int persistent_read_metadata(struct exception_store *store)
/*
* Sanity checks.
*/
- if (!ps->valid) {
- DMWARN("snapshot is marked invalid");
- return -EINVAL;
- }
-
if (ps->version != SNAPSHOT_DISK_VERSION) {
DMWARN("unable to handle snapshot disk version %d",
ps->version);
@@ -501,6 +496,12 @@ static int persistent_read_metadata(struct exception_store *store)
}
/*
+ * Metadata are valid, but snapshot is invalidated
+ */
+ if (!ps->valid)
+ return 1;
+
+ /*
* Read the metadata.
*/
r = read_exceptions(ps);
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 1da4122..854891d 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);
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