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dm era: save spacemap metadata root after the pre-commit

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commit 117aceb030307dcd431fdcff87ce988d3016c34a upstream.

When committing era metadata to disk, it doesn't always save the latest
spacemap metadata root in superblock. Due to this, metadata is getting
corrupted sometimes when reopening the device. The correct order of update
should be, pre-commit (shadows spacemap root), save the spacemap root
(newly shadowed block) to in-core superblock and then the final commit.

Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Somasundaram Krishnasamy 2017-04-07 12:14:55 -07:00 • committed by Greg Kroah-Hartman
parent dcd4004ae5
commit 341adf5168
1 changed files with 6 additions and 6 deletions
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12
drivers/md/dm-era-target.c
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@ -961,18 +961,18 @@ static int metadata_commit(struct era_metadata *md)
}
}
r = save_sm_root(md);
if (r) {
DMERR("%s: save_sm_root failed", __func__);
return r;
}
r = dm_tm_pre_commit(md->tm);
if (r) {
DMERR("%s: pre commit failed", __func__);
return r;
}
r = save_sm_root(md);
if (r) {
DMERR("%s: save_sm_root failed", __func__);
return r;
}
r = superblock_lock(md, &sblock);
if (r) {
DMERR("%s: superblock lock failed", __func__);