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xfs: fix the extent count when allocating an new indirection array entry 

At xfs_iext_add(), if extent(s) are being appended to the last page in
the indirection array and the new extent(s) don't fit in the page, the
number of extents(erp->er_extcount) in a new allocated entry should be
the minimum value between count and XFS_LINEAR_EXTS, instead of count.

For now, there is no existing test case can demonstrates a problem with
the er_extcount being set incorrectly here, but it obviously like a bug.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Jie Liu 2013-10-25 14:52:44 +08:00 committed by Ben Myers
parent 10e6e65dfc
commit bb86d21cba
1 changed files with 4 additions and 5 deletions
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9
fs/xfs/xfs_inode_fork.c
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@ -1021,15 +1021,14 @@ xfs_iext_add(
* the next index needed in the indirection array.
*/
else {
int count = ext_diff;
uint count = ext_diff;
while (count) {
erp = xfs_iext_irec_new(ifp, erp_idx);
erp->er_extcount = count;
count -= MIN(count, (int)XFS_LINEAR_EXTS);
if (count) {
erp->er_extcount = min(count, XFS_LINEAR_EXTS);
count -= erp->er_extcount;
if (count)
erp_idx++;
}
}
}
}