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>

1 files changed, 9 insertions, 10 deletions

diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c
index 4c5488468c14..d184e0b4b95f 100644
--- a/fs/ocfs2/move_extents.c
+++ b/fs/ocfs2/move_extents.c
@@ -368,7 +368,7 @@ static int ocfs2_find_victim_alloc_group(struct inode *inode,
                                          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 @@ static int ocfs2_find_victim_alloc_group(struct inode *inode,
         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 @@ static int ocfs2_find_victim_alloc_group(struct inode *inode,
                                                 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 @@ static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
         /*
          * 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.