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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:55 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:28 +1100
commitfb045adb99d9b7c562dc7fef834857f78249daa1 (patch)
tree1fd6a4024fffeec568abe100d730589bfdb81c38 /fs/fat/inode.c
parent5f57cbcc02cf18f6b22ef4066bb10afeb8f930ff (diff)
fs: dcache reduce branches in lookup path
Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/fat/inode.c')
-rw-r--r--fs/fat/inode.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 8cccfebee180..206351af7c58 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -750,7 +750,7 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
*/
result = d_obtain_alias(inode);
if (!IS_ERR(result))
- result->d_op = sb->s_root->d_op;
+ d_set_d_op(result, sb->s_root->d_op);
return result;
}
@@ -800,7 +800,7 @@ static struct dentry *fat_get_parent(struct dentry *child)
parent = d_obtain_alias(inode);
if (!IS_ERR(parent))
- parent->d_op = sb->s_root->d_op;
+ d_set_d_op(parent, sb->s_root->d_op);
out:
unlock_super(sb);