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Commit 00d09882 authored by Tao Ma's avatar Tao Ma Committed by Theodore Ts'o
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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: default avatarTao Ma <boyu.mt@taobao.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent e8bbe8c4

fs/ext4/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -4617,7 +4617,7 @@ static int __ext4_get_inode_loc(struct inode *inode, 
	/*

	 * 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) %

			EXT4_INODES_PER_GROUP(sb));

	block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block);