No need to mess with ->d_op at all. Note that ->d_delete that always
returns 1 is equivalent to having DCACHE_DONTCACHE in ->d_flags.
Later the same thing will be placed into ->s_d_flags of the filesystems
where we want that behaviour for all dentries; then the check in
simple_lookup() will at least get unlikely() slapped on it.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
fs/libfs.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/libfs.c b/fs/libfs.c
index 929bef0fecbd..b15a2148714e 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -75,9 +75,11 @@ struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, unsigned
{
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
- if (!dentry->d_op)
- d_set_d_op(dentry, &simple_dentry_operations);
-
+ if (!(dentry->d_flags & DCACHE_DONTCACHE)) {
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags |= DCACHE_DONTCACHE;
+ spin_unlock(&dentry->d_lock);
+ }
if (IS_ENABLED(CONFIG_UNICODE) && IS_CASEFOLDED(dir))
return NULL;
--
2.39.5
