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>
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index 715f7d3..679a849 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -172,7 +172,7 @@
struct inode *inode;
struct page *page;
- dentry->d_op = dir->i_sb->s_root->d_op;
+ d_set_d_op(dentry, dir->i_sb->s_root->d_op);
page = alloc_page(GFP_USER);
if (!page)