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/btrfs/export.c b/fs/btrfs/export.c
index 659f532..0ccf9a8 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -110,7 +110,7 @@
dentry = d_obtain_alias(inode);
if (!IS_ERR(dentry))
- dentry->d_op = &btrfs_dentry_operations;
+ d_set_d_op(dentry, &btrfs_dentry_operations);
return dentry;
fail:
srcu_read_unlock(&fs_info->subvol_srcu, index);
@@ -225,7 +225,7 @@
key.offset = 0;
dentry = d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root, NULL));
if (!IS_ERR(dentry))
- dentry->d_op = &btrfs_dentry_operations;
+ d_set_d_op(dentry, &btrfs_dentry_operations);
return dentry;
fail:
btrfs_free_path(path);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f9d2994..63e4546 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4084,7 +4084,7 @@
int index;
int ret;
- dentry->d_op = &btrfs_dentry_operations;
+ d_set_d_op(dentry, &btrfs_dentry_operations);
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);