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authorEric Sandeen <sandeen@sandeen.net>2015-07-29 11:53:31 +1000
committerDave Chinner <david@fromorbit.com>2015-07-29 11:53:31 +1000
commitce748eaa65f2e9392ba82726503c8d994ffd6393 (patch)
treeff3ec811268e84efbcebbf4b24ec23ff3438c1c7 /fs/xfs/libxfs/xfs_alloc.c
parentbc0195aad0daa2ad5b0d76cce22b167bc3435590 (diff)
downloadlinux-ce748eaa65f2e9392ba82726503c8d994ffd6393.tar.bz2
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_alloc.c')
-rw-r--r--fs/xfs/libxfs/xfs_alloc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index f9e9ffe6fb46..b7fc17ce8233 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -464,7 +464,7 @@ xfs_agfl_verify(
struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
int i;
- if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_uuid))
+ if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (be32_to_cpu(agfl->agfl_magicnum) != XFS_AGFL_MAGIC)
return false;
@@ -2260,7 +2260,7 @@ xfs_agf_verify(
struct xfs_agf *agf = XFS_BUF_TO_AGF(bp);
if (xfs_sb_version_hascrc(&mp->m_sb) &&
- !uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_uuid))
+ !uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (!(agf->agf_magicnum == cpu_to_be32(XFS_AGF_MAGIC) &&