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>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f2fa5e8a582c..3424e82392ad 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -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);