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>

1 files changed, 8 insertions, 8 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 88bfe686ac00..e3b10ca6d453 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -135,9 +135,9 @@ static void setup_cifs_dentry(struct cifsTconInfo *tcon,
                               struct inode *newinode)
 {
         if (tcon->nocase)
-                direntry->d_op = &cifs_ci_dentry_ops;
+                d_set_d_op(direntry, &cifs_ci_dentry_ops);
         else
-                direntry->d_op = &cifs_dentry_ops;
+                d_set_d_op(direntry, &cifs_dentry_ops);
         d_instantiate(direntry, newinode);
 }
 
@@ -421,9 +421,9 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
                 rc = cifs_get_inode_info_unix(&newinode, full_path,
                                                 inode->i_sb, xid);
                 if (pTcon->nocase)
-                        direntry->d_op = &cifs_ci_dentry_ops;
+                        d_set_d_op(direntry, &cifs_ci_dentry_ops);
                 else
-                        direntry->d_op = &cifs_dentry_ops;
+                        d_set_d_op(direntry, &cifs_dentry_ops);
 
                 if (rc == 0)
                         d_instantiate(direntry, newinode);
@@ -604,9 +604,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 
         if ((rc == 0) && (newInode != NULL)) {
                 if (pTcon->nocase)
-                        direntry->d_op = &cifs_ci_dentry_ops;
+                        d_set_d_op(direntry, &cifs_ci_dentry_ops);
                 else
-                        direntry->d_op = &cifs_dentry_ops;
+                        d_set_d_op(direntry, &cifs_dentry_ops);
                 d_add(direntry, newInode);
                 if (posix_open) {
                         filp = lookup_instantiate_filp(nd, direntry,
@@ -634,9 +634,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
                 rc = 0;
                 direntry->d_time = jiffies;
                 if (pTcon->nocase)
-                        direntry->d_op = &cifs_ci_dentry_ops;
+                        d_set_d_op(direntry, &cifs_ci_dentry_ops);
                 else
-                        direntry->d_op = &cifs_dentry_ops;
+                        d_set_d_op(direntry, &cifs_dentry_ops);
                 d_add(direntry, NULL);
         /*      if it was once a directory (but how can we tell?) we could do
                 shrink_dcache_parent(direntry); */