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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2016-01-04 08:13:21 +0300 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2016-02-02 22:09:15 +0300 |
| commit | be3f616927c1c60cf8fc61ac97be026450839cc6 (patch) | |
| tree | 1fba002bb54c769c7f10de99913dba269b302de1 /arch/x86 | |
| parent | a81b08600864586b8bfb62f9c0c312b3bcd64c2c (diff) | |
| download | linux-be3f616927c1c60cf8fc61ac97be026450839cc6.tar.xz | |
libxfs: pack the agfl header structure so XFS_AGFL_SIZE is correct
commit 96f859d52bcb1c6ea6f3388d39862bf7143e2f30 upstream.
Because struct xfs_agfl is 36 bytes long and has a 64-bit integer
inside it, gcc will quietly round the structure size up to the nearest
64 bits -- in this case, 40 bytes. This results in the XFS_AGFL_SIZE
macro returning incorrect results for v5 filesystems on 64-bit
machines (118 items instead of 119). As a result, a 32-bit xfs_repair
will see garbage in AGFL item 119 and complain.
Therefore, tell gcc not to pad the structure so that the AGFL size
calculation is correct.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
[ luis: backported to 3.16:
- file rename: fs/xfs/libxfs/xfs_format.h -> fs/xfs/xfs_ag.h ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'arch/x86')
0 files changed, 0 insertions, 0 deletions