[PATCH] VFS/autofs: try_lookup_one_len() does not need any locks

try_lookup_one_len() is identical to lookup_one_unlocked() except that
it doesn't include the call to lookup_slow().  The latter doesn't need
the inode to be locked, so the former cannot either.

So fix the documentation, remove the WARN_ON and fix the only caller to
not take the lock.

Signed-off-by: NeilBrown <[email protected]>
---

Note that in current upstream fs/afs/dynroot.c also contains a call to
try_lookup_one_len() with unnecessary locking.  However
vfs-6.15.shared.afs contains a patch which removes that call, so I
didn't bother addressing it here.

NeilBrown


 fs/autofs/dev-ioctl.c | 3 ---
 fs/namei.c            | 5 ++---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/fs/autofs/dev-ioctl.c b/fs/autofs/dev-ioctl.c
index 6d57efbb8110..c5a6aae12d2c 100644
--- a/fs/autofs/dev-ioctl.c
+++ b/fs/autofs/dev-ioctl.c
@@ -442,7 +442,6 @@ static int autofs_dev_ioctl_timeout(struct file *fp,
 		sbi->exp_timeout = timeout * HZ;
 	} else {
 		struct dentry *base = fp->f_path.dentry;
-		struct inode *inode = base->d_inode;
 		int path_len = param->size - AUTOFS_DEV_IOCTL_SIZE - 1;
 		struct dentry *dentry;
 		struct autofs_info *ino;
@@ -460,9 +459,7 @@ static int autofs_dev_ioctl_timeout(struct file *fp,
 				"the parent autofs mount timeout which could "
 				"prevent shutdown\n");
 
-		inode_lock_shared(inode);
 		dentry = try_lookup_one_len(param->path, base, path_len);
-		inode_unlock_shared(inode);
 		if (IS_ERR_OR_NULL(dentry))
 			return dentry ? PTR_ERR(dentry) : -ENOENT;
 		ino = autofs_dentry_ino(dentry);
diff --git a/fs/namei.c b/fs/namei.c
index ecb7b95c2ca3..c6cef0af0625 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2863,15 +2863,14 @@ static int lookup_one_common(struct mnt_idmap *idmap,
  * Note that this routine is purely a helper for filesystem usage and should
  * not be called by generic code.
  *
- * The caller must hold base->i_mutex.
+ * No locks need be held - only a counted reference to @base is needed.
+ *
  */
 struct dentry *try_lookup_one_len(const char *name, struct dentry *base, int len)
 {
 	struct qstr this;
 	int err;
 
-	WARN_ON_ONCE(!inode_is_locked(base->d_inode));
-
 	err = lookup_one_common(&nop_mnt_idmap, name, base, len, &this);
 	if (err)
 		return ERR_PTR(err);
-- 
2.48.1