diff options
Diffstat (limited to 'fs/kernfs/dir.c')
| -rw-r--r-- | fs/kernfs/dir.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index cf4c636ff4da..439b946c4808 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -41,6 +41,9 @@ static bool kernfs_lockdep(struct kernfs_node *kn) static int kernfs_name_locked(struct kernfs_node *kn, char *buf, size_t buflen) { + if (!kn) + return strlcpy(buf, "(null)", buflen); + return strlcpy(buf, kn->parent ? kn->name : "/", buflen); } @@ -110,6 +113,8 @@ static struct kernfs_node *kernfs_common_ancestor(struct kernfs_node *a, * kn_to: /n1/n2/n3 [depth=3] * result: /../.. * + * [3] when @kn_to is NULL result will be "(null)" + * * Returns the length of the full path. If the full length is equal to or * greater than @buflen, @buf contains the truncated path with the trailing * '\0'. On error, -errno is returned. @@ -123,6 +128,9 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to, size_t depth_from, depth_to, len = 0; int i, j; + if (!kn_to) + return strlcpy(buf, "(null)", buflen); + if (!kn_from) kn_from = kernfs_root(kn_to)->kn; @@ -166,6 +174,8 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to, * similar to strlcpy(). It returns the length of @kn's name and if @buf * isn't long enough, it's filled upto @buflen-1 and nul terminated. * + * Fills buffer with "(null)" if @kn is NULL. + * * This function can be called from any context. */ int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen) |