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authorMilan Broz <mbroz@redhat.com>2007-07-12 17:28:13 +0100
committerWilly Tarreau <w@1wt.eu>2007-08-25 17:24:15 +0200
commitf4c146b686810ba345b72ca3e2a0c74586838f1c (patch)
tree534dd2516b5c6a140dac621388cff627d36174b6
parentf83801d9974cda3172c4ca9c72ca39940df30f47 (diff)
[PATCH] 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. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Willy Tarreau <w@1wt.eu>
-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 99cdffa7fbfe..fc496fcaa2e1 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -453,11 +453,6 @@ 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);
@@ -465,6 +460,12 @@ 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 0821a2b68a73..9227ba4f19db 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -522,9 +522,12 @@ 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);