dummy/linux-stable-mirror
1
0
Fork 1
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2025-04-19 20:58:31 +09:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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 <neilb@suse.de>
Link: https://lore.kernel.org/r/174190517441.9342.5956460781380903128@noble.neil.brown.name
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
NeilBrown 2025-03-14 09:32:54 +11:00 committed by Christian Brauner
parent 611851010c
commit 514b687111
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 2 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/autofs/dev-ioctl.c
View File

@ -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);

5
fs/namei.c
View File

@ -2864,15 +2864,14 @@ 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);