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Message-Id: <1243551665-23596-1-git-send-email-ebiederm@xmission.com>
Date: Thu, 28 May 2009 16:00:42 -0700
From: "Eric W. Biederman" <ebiederm@...ssion.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...e.de>
Cc: <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
Cornelia Huck <cornelia.huck@...ibm.com>,
<linux-fsdevel@...r.kernel.org>,
Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Benjamin Thery <benjamin.thery@...l.net>,
Daniel Lezcano <dlezcano@...ibm.com>,
"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: [PATCH 01/24] sysfs: Implement sysfs_rename_link
From: Eric W. Biederman <ebiederm@...ssion.com>
Because of rename ordering problems we occassionally give false
warnings about invalid sysfs operations, so implement a helper
function for this common sysfs idiom.
This is a stripped down version of an earlier patch that
also added sysfs_delete_link.
Cc: Benjamin Thery <benjamin.thery@...l.net>
Cc: Daniel Lezcano <dlezcano@...ibm.com>
Cc: Tejun Heo <tj@...nel.org>
Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
fs/sysfs/symlink.c | 16 ++++++++++++++++
include/linux/sysfs.h | 9 +++++++++
2 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index a3ba217..11c4da5 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -122,6 +122,22 @@ void sysfs_remove_link(struct kobject * kobj, const char * name)
sysfs_hash_and_remove(parent_sd, name);
}
+/**
+ * sysfs_rename_link - rename symlink in object's directory.
+ * @kobj: object we're acting for.
+ * @targ: object we're pointing to.
+ * @old: previous name of the symlink.
+ * @new: new name of the symlink.
+ *
+ * A helper function for the common rename symlink idiom.
+ */
+int sysfs_rename_link(struct kobject *kobj, struct kobject *targ,
+ const char *old, const char *new)
+{
+ sysfs_remove_link(kobj, old);
+ return sysfs_create_link(kobj, targ, new);
+}
+
static int sysfs_get_target_path(struct sysfs_dirent *parent_sd,
struct sysfs_dirent *target_sd, char *path)
{
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 9d68fed..18c8e70 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -109,6 +109,9 @@ int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
const char *name);
void sysfs_remove_link(struct kobject *kobj, const char *name);
+int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
+ const char *old_name, const char *new_name);
+
int __must_check sysfs_create_group(struct kobject *kobj,
const struct attribute_group *grp);
int sysfs_update_group(struct kobject *kobj,
@@ -202,6 +205,12 @@ static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
{
}
+static inline int sysfs_rename_link(struct kobject *k, struct kobject *t,
+ const char *old_name, const char *new_name)
+{
+ return 0;
+}
+
static inline int sysfs_create_group(struct kobject *kobj,
const struct attribute_group *grp)
{
--
1.6.3.1.54.g99dd.dirty
--
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