linux-ext4 - [PATCH] ext4: Use s_inodes_per_block directly in __ext4_get_inode

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Message-Id: <1301326873-9551-2-git-send-email-tm@tao.ma>
Date:	Mon, 28 Mar 2011 23:41:13 +0800
From:	Tao Ma <tm@....ma>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH] ext4: Use s_inodes_per_block directly in __ext4_get_inode_loc.

From: Tao Ma <boyu.mt@...bao.com>

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 really 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@...bao.com>
---
 fs/ext4/inode.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1a86282..326efd9 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4605,7 +4605,7 @@ 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);
-- 
1.7.4

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