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Commit 6aea6f50 authored by Tristan Ye's avatar Tristan Ye
Browse files

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: default avatarTristan Ye <tristan.ye@oracle.com>
parent dda54e76

fs/ocfs2/move_extents.c

+9 −10
Original line number Diff line number Diff line
@@ -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.