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| author | Eric Sandeen <sandeen@sandeen.net> | 2015-07-29 11:53:31 +1000 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2015-07-29 11:53:31 +1000 |
| commit | ce748eaa65f2e9392ba82726503c8d994ffd6393 (patch) | |
| tree | ff3ec811268e84efbcebbf4b24ec23ff3438c1c7 /fs/xfs/libxfs/xfs_attr_remote.c | |
| parent | bc0195aad0daa2ad5b0d76cce22b167bc3435590 (diff) | |
| download | lwn-ce748eaa65f2e9392ba82726503c8d994ffd6393.tar.gz lwn-ce748eaa65f2e9392ba82726503c8d994ffd6393.zip | |
xfs: create new metadata UUID field and incompat flag
This adds a new superblock field, sb_meta_uuid. If set, along with
a new incompat flag, the code will use that field on a V5 filesystem
to compare to metadata UUIDs, which allows us to change the user-
visible UUID at will. Userspace handles the setting and clearing
of the incompat flag as appropriate, as the UUID gets changed; i.e.
setting the user-visible UUID back to the original UUID (as stored in
the new field) will remove the incompatible feature flag.
If the incompat flag is not set, this copies the user-visible UUID into
into the meta_uuid slot in memory when the superblock is read from disk;
the meta_uuid field is not written back to disk in this case.
The remainder of this patch simply switches verifiers, initializers,
etc to use the new sb_meta_uuid field.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_attr_remote.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_attr_remote.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c index 20de88d1bf86..eba0d1e91a93 100644 --- a/fs/xfs/libxfs/xfs_attr_remote.c +++ b/fs/xfs/libxfs/xfs_attr_remote.c @@ -100,7 +100,7 @@ xfs_attr3_rmt_verify( return false; if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC)) return false; - if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid)) + if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid)) return false; if (be64_to_cpu(rmt->rm_blkno) != bno) return false; @@ -217,7 +217,7 @@ xfs_attr3_rmt_hdr_set( rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC); rmt->rm_offset = cpu_to_be32(offset); rmt->rm_bytes = cpu_to_be32(size); - uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid); + uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_meta_uuid); rmt->rm_owner = cpu_to_be64(ino); rmt->rm_blkno = cpu_to_be64(bno); |