diff options
| author | Eric Sandeen <sandeen@sandeen.net> | 2015-07-29 04:53:31 +0300 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2015-07-29 04:53:31 +0300 |
| commit | ce748eaa65f2e9392ba82726503c8d994ffd6393 (patch) | |
| tree | ff3ec811268e84efbcebbf4b24ec23ff3438c1c7 /fs/xfs/libxfs/xfs_ialloc.c | |
| parent | bc0195aad0daa2ad5b0d76cce22b167bc3435590 (diff) | |
| download | linux-ce748eaa65f2e9392ba82726503c8d994ffd6393.tar.xz | |
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_ialloc.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_ialloc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c index 66efc702452a..ce63e0431f3e 100644 --- a/fs/xfs/libxfs/xfs_ialloc.c +++ b/fs/xfs/libxfs/xfs_ialloc.c @@ -338,7 +338,8 @@ xfs_ialloc_inode_init( if (version == 3) { free->di_ino = cpu_to_be64(ino); ino++; - uuid_copy(&free->di_uuid, &mp->m_sb.sb_uuid); + uuid_copy(&free->di_uuid, + &mp->m_sb.sb_meta_uuid); xfs_dinode_calc_crc(mp, free); } else if (tp) { /* just log the inode core */ @@ -2500,7 +2501,7 @@ xfs_agi_verify( struct xfs_agi *agi = XFS_BUF_TO_AGI(bp); if (xfs_sb_version_hascrc(&mp->m_sb) && - !uuid_equal(&agi->agi_uuid, &mp->m_sb.sb_uuid)) + !uuid_equal(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid)) return false; /* * Validate the magic number of the agi block. |