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ext4: use s_inodes_per_block directly in __ext4_get_inode_loc 

In __ext4_get_inode_loc, we calculate inodes_per_block every time by
EXT4_BLOCK_SIZE(sb) / EXT4_INODE_SIZE(sb).  AFAICS, this function is a
hot path for ext4, so we'd better use s_inodes_per_block directly
instead of calculating every time.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Tao Ma 2011-05-09 10:26:41 -04:00 committed by Theodore Ts'o
parent e8bbe8c401
commit 00d098822f
1 changed files with 1 additions and 1 deletions
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fs/ext4/inode.c
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@ -4617,7 +4617,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
/* /*
* Figure out the offset within the block group inode table * Figure out the offset within the block group inode table
*/ */
inodes_per_block = (EXT4_BLOCK_SIZE(sb) / EXT4_INODE_SIZE(sb)); inodes_per_block = EXT4_SB(sb)->s_inodes_per_block;
inode_offset = ((inode->i_ino - 1) % inode_offset = ((inode->i_ino - 1) %
EXT4_INODES_PER_GROUP(sb)); EXT4_INODES_PER_GROUP(sb));
block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block); block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block);