aboutsummaryrefslogtreecommitdiff
path: root/fs
diff options
context:
space:
mode:
Diffstat (limited to 'fs')
-rw-r--r--fs/namei.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 5abab917690..6b29a51bef5 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1814,9 +1814,27 @@ static int do_path_lookup(int dfd, const char *name,
return retval;
}
-int kern_path_parent(const char *name, struct nameidata *nd)
+/* does lookup, returns the object with parent locked */
+struct dentry *kern_path_locked(const char *name, struct path *path)
{
- return do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, nd);
+ struct nameidata nd;
+ struct dentry *d;
+ int err = do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, &nd);
+ if (err)
+ return ERR_PTR(err);
+ if (nd.last_type != LAST_NORM) {
+ path_put(&nd.path);
+ return ERR_PTR(-EINVAL);
+ }
+ mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+ d = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
+ if (IS_ERR(d)) {
+ mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+ path_put(&nd.path);
+ return d;
+ }
+ *path = nd.path;
+ return d;
}
int kern_path(const char *name, unsigned int flags, struct path *path)