From 8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Tue, 15 Dec 2015 14:52:16 -0300 Subject: Linux-libre 4.3.2-gnu --- fs/kernfs/dir.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'fs/kernfs') diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 2d48d28e1..91e004518 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -91,6 +91,29 @@ int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen) return ret; } +/** + * kernfs_path_len - determine the length of the full path of a given node + * @kn: kernfs_node of interest + * + * The returned length doesn't include the space for the terminating '\0'. + */ +size_t kernfs_path_len(struct kernfs_node *kn) +{ + size_t len = 0; + unsigned long flags; + + spin_lock_irqsave(&kernfs_rename_lock, flags); + + do { + len += strlen(kn->name) + 1; + kn = kn->parent; + } while (kn && kn->parent); + + spin_unlock_irqrestore(&kernfs_rename_lock, flags); + + return len; +} + /** * kernfs_path - build full path of a given node * @kn: kernfs_node of interest -- cgit v1.2.3-54-g00ecf