linux-kernel - [PATCH 3/4] kernfs: remove kernfs_path

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Date:	Tue,  9 Aug 2016 01:23:23 -0400
From:	Tejun Heo <tj@...nel.org>
To:	gregkh@...uxfoundation.org, serge.hallyn@...ntu.com
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kernel-team@...com, hannes@...xchg.org, lizefan@...wei.com,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 3/4] kernfs: remove kernfs_path_len()

It doesn't have any in-kernel user and the same result can be obtained
from kernfs_path(@kn, NULL, 0).  Remove it.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Serge Hallyn <serge.hallyn@...ntu.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/kernfs/dir.c        | 23 -----------------------
 include/linux/kernfs.h |  4 ----
 2 files changed, 27 deletions(-)

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 09242aa..6e7fd37 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -180,29 +180,6 @@ int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
 }
 
 /**
- * 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_from_node - build path of node @to relative to @from.
  * @from: parent kernfs_node relative to which we need to build the path
  * @to: kernfs_node of interest
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 64358d2..a410c75 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -269,7 +269,6 @@ static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
 }
 
 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);
 void pr_cont_kernfs_name(struct kernfs_node *kn);
@@ -340,9 +339,6 @@ static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
 static inline int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
 { return -ENOSYS; }
 
-static inline size_t kernfs_path_len(struct kernfs_node *kn)
-{ return 0; }
-
 static inline int kernfs_path_from_node(struct kernfs_node *root_kn,
 					struct kernfs_node *kn,
 					char *buf, size_t buflen);
-- 
2.7.4