kernfs: make kernfs_path*() behave in the style of strlcpy()

kernfs_path*() functions always return the length of the full path but
the path content is undefined if the length is larger than the
provided buffer.  This makes its behavior different from strlcpy() and
requires error handling in all its users even when they don't care
about truncation.  In addition, the implementation can actully be
simplified by making it behave properly in strlcpy() style.

* Update kernfs_path_from_node_locked() to always fill up the buffer
  with path.  If the buffer is not large enough, the output is
  truncated and terminated.

* kernfs_path() no longer needs error handling.  Make it a simple
  inline wrapper around kernfs_path_from_node().

* sysfs_warn_dup()'s use of kernfs_path() doesn't need error handling.
  Updated accordingly.

* cgroup_path()'s use of kernfs_path() updated to retain the old
  behavior.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Serge Hallyn <serge.hallyn@ubuntu.com>

2 files changed, 22 insertions, 6 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 984f73b..5a9abde 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -541,7 +541,12 @@ static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)
 static inline char * __must_check cgroup_path(struct cgroup *cgrp, char *buf,
 					      size_t buflen)
 {
-	return kernfs_path(cgrp->kn, buf, buflen);
+	int ret;
+
+	ret = kernfs_path(cgrp->kn, buf, buflen);
+	if (ret < 0 || ret >= buflen)
+		return NULL;
+	return buf;
 }
 
 static inline void pr_cont_cgroup_name(struct cgroup *cgrp)
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 7d2efd2..4a02b1b 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -272,7 +272,6 @@ int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen);
 size_t kernfs_path_len(struct kernfs_node *kn);
 int kernfs_path_from_node(struct kernfs_node *root_kn, struct kernfs_node *kn,
 			  char *buf, size_t buflen);
-char *kernfs_path(struct kernfs_node *kn, char *buf, size_t buflen);
 void pr_cont_kernfs_name(struct kernfs_node *kn);
 void pr_cont_kernfs_path(struct kernfs_node *kn);
 struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn);
@@ -349,10 +348,6 @@ static inline int kernfs_path_from_node(struct kernfs_node *root_kn,
 					char *buf, size_t buflen)
 { return -ENOSYS; }
 
-static inline char *kernfs_path(struct kernfs_node *kn, char *buf,
-				size_t buflen)
-{ return NULL; }
-
 static inline void pr_cont_kernfs_name(struct kernfs_node *kn) { }
 static inline void pr_cont_kernfs_path(struct kernfs_node *kn) { }
 
@@ -441,6 +436,22 @@ static inline void kernfs_init(void) { }
 
 #endif	/* CONFIG_KERNFS */
 
+/**
+ * kernfs_path - build full path of a given node
+ * @kn: kernfs_node of interest
+ * @buf: buffer to copy @kn's name into
+ * @buflen: size of @buf
+ *
+ * Builds and returns the full path of @kn in @buf of @buflen bytes.  The
+ * path is built from the end of @buf so the returned pointer usually
+ * doesn't match @buf.  If @buf isn't long enough, @buf is nul terminated
+ * and %NULL is returned.
+ */
+static inline int kernfs_path(struct kernfs_node *kn, char *buf, size_t buflen)
+{
+	return kernfs_path_from_node(kn, NULL, buf, buflen);
+}
+
 static inline struct kernfs_node *
 kernfs_find_and_get(struct kernfs_node *kn, const char *name)
 {