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authorDave Chinner <dchinner@redhat.com>2016-04-06 07:06:20 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-06-07 18:14:38 -0700
commitd7d92ca7dd363153407b19c749ce9a9ea1f46fcb (patch)
tree03fc91685c785aa70fb2b0c69fb74eff7e903b7e /fs/xfs
parentec86bfec23e3e5d92ac5e6242f074c92f127d6ef (diff)
xfs: Don't wrap growfs AGFL indexes
commit ad747e3b299671e1a53db74963cc6c5f6cdb9f6d upstream. Commit 96f859d ("libxfs: pack the agfl header structure so XFS_AGFL_SIZE is correct") allowed the freelist to use the empty slot at the end of the freelist on 64 bit systems that was not being used due to sizeof() rounding up the structure size. This has caused versions of xfs_repair prior to 4.5.0 (which also has the fix) to report this as a corruption once the filesystem has been grown. Older kernels can also have problems (seen from a whacky container/vm management environment) mounting filesystems grown on a system with a newer kernel than the vm/container it is deployed on. To avoid this problem, change the initial free list indexes not to wrap across the end of the AGFL, hence avoiding the initialisation of agf_fllast to the last index in the AGFL. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_fsops.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index ee3aaa0a5317..ca0d3eb44925 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -243,8 +243,8 @@ xfs_growfs_data_private(
agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
- agf->agf_flfirst = 0;
- agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
+ agf->agf_flfirst = cpu_to_be32(1);
+ agf->agf_fllast = 0;
agf->agf_flcount = 0;
tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
agf->agf_freeblks = cpu_to_be32(tmpsize);