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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/dm-exception-store.c
parentfcac03abd325e4f7a4cc8fe05fea2793b1c8eb75 (diff)
downloadlinux-0764147b111b8ca886e4f2e9c9e019106b09b657.tar.bz2
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-exception-store.c')
-rw-r--r--drivers/md/dm-exception-store.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 8c25c2ff724a..3d65917a1bbb 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);