Ocfs2/move_extents: Avoid doing division in extent moving.
It's not wise enough to do a 64bits division anywhere in kernside, replace it
with a decent helper or proper shifts.
Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c
index 4c54884..d184e0b 100644
--- a/fs/ocfs2/move_extents.c
+++ b/fs/ocfs2/move_extents.c
@@ -368,7 +368,7 @@
int *vict_bit,
struct buffer_head **ret_bh)
{
- int ret, i, blocks_per_unit = 1;
+ int ret, i, bits_per_unit = 0;
u64 blkno;
char namebuf[40];
@@ -398,14 +398,14 @@
rec = &(cl->cl_recs[0]);
if (type == GLOBAL_BITMAP_SYSTEM_INODE)
- blocks_per_unit <<= (osb->s_clustersize_bits -
- inode->i_sb->s_blocksize_bits);
+ bits_per_unit = osb->s_clustersize_bits -
+ inode->i_sb->s_blocksize_bits;
/*
* 'vict_blkno' was out of the valid range.
*/
if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
- (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) *
- blocks_per_unit))) {
+ (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
+ bits_per_unit))) {
ret = -EINVAL;
goto out;
}
@@ -441,8 +441,8 @@
le16_to_cpu(bg->bg_bits))) {
*ret_bh = gd_bh;
- *vict_bit = (vict_blkno - blkno) /
- blocks_per_unit;
+ *vict_bit = (vict_blkno - blkno) >>
+ bits_per_unit;
mlog(0, "find the victim group: #%llu, "
"total_bits: %u, vict_bit: %u\n",
blkno, le16_to_cpu(bg->bg_bits),
@@ -493,9 +493,8 @@
/*
* make goal become cluster aligned.
*/
- if (range->me_goal % c_to_b)
- range->me_goal = range->me_goal / c_to_b * c_to_b;
-
+ range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
+ range->me_goal);
/*
* moving goal is not allowd to start with a group desc blok(#0 blk)
* let's compromise to the latter cluster.
