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dm snapshot: permit invalid activation

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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>
This commit is contained in:
Milan Broz
2007-07-12 17:28:13 +01:00
committed by Linus Torvalds
parent fcac03abd3
commit 0764147b11
2 changed files with 10 additions and 6 deletions
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11
drivers/md/dm-exception-store.c
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@ -489,17 +489,18 @@ 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);
return -EINVAL;
}
/*
* Metadata are valid, but snapshot is invalidated
*/
if (!ps->valid)
return 1;
/*
* Read the metadata.
*/