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xfs: fix sparse inodes 32-bit compile failure 

The kbuild test robot reports the following compilation failure with a
32-bit kernel configuration:

	fs/built-in.o: In function `xfs_ifree_cluster':
	>> xfs_inode.c:(.text+0x17ac84): undefined reference to `__umoddi3'

This is due to the use of the modulus operator on a 64-bit variable in
the ASSERT() added as part of the following commit:

	xfs: skip unallocated regions of inode chunks in xfs_ifree_cluster()

This ASSERT() simply checks that the offset of the inode in a sparse
cluster is appropriately aligned. Since the maximum inode record offset
is 63 (for a 64 inode record) and the calculated offset here should be
something less than that, just use a 32-bit variable to store the offset
and call the do_mod() helper.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Brian Foster 2015-06-04 13:03:34 +10:00 committed by Dave Chinner
parent 22ce1e1472
commit 3cdaa1898f
1 changed files with 4 additions and 3 deletions
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7
fs/xfs/xfs_inode.c
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@ -2248,6 +2248,7 @@ xfs_ifree_cluster(
int inodes_per_cluster;
int nbufs;
int i, j;
int ioffset;
xfs_daddr_t blkno;
xfs_buf_t *bp;
xfs_inode_t *ip;
@ -2268,9 +2269,9 @@ xfs_ifree_cluster(
* physically allocated. Skip the cluster if an inode falls into
* a sparse region.
*/
if ((xic->alloc & XFS_INOBT_MASK(inum - xic->first_ino)) == 0) {
ASSERT(((inum - xic->first_ino) %
inodes_per_cluster) == 0);
ioffset = inum - xic->first_ino;
if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) {
ASSERT(do_mod(ioffset, inodes_per_cluster) == 0);
continue;
}