From: Jie Liu <jeff.liu@xxxxxxxxxx>
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@xxxxxxxxxx>
---
v2: * Declare count to uint as it will be decreased to 0 and XFS_LINEAR_EXTS
can be uint because of a case in the macro.
* Convert MIN() to min().
* Revise the commits log to indicate there is no existing test case can
reflect this issue for future tracking up.
fs/xfs/xfs_inode_fork.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/xfs/xfs_inode_fork.c b/fs/xfs/xfs_inode_fork.c
index 22c9837..cfee14a 100644
--- a/fs/xfs/xfs_inode_fork.c
+++ b/fs/xfs/xfs_inode_fork.c
@@ -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++;
- }
}
}
}
--
1.7.9.5
_______________________________________________
xfs mailing list
xfs@xxxxxxxxxxx
http://oss.sgi.com/mailman/listinfo/xfs
