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Date: Wed, 21 May 2008 10:05:56 +0200
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: Greg KH <greg@...ah.com>
Cc: David Miller <davem@...emloft.net>, shemminger@...tta.com,
fubar@...ibm.com, netdev@...r.kernel.org,
bonding-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] driver core: Suppress sysfs warnings for
device_rename().
On Tue, 20 May 2008 15:52:44 -0700,
Greg KH <greg@...ah.com> wrote:
> On Tue, May 20, 2008 at 12:59:13PM +0200, Cornelia Huck wrote:
> > OK, here is an actually-compiled patch with proper description and
> > s-o-b. Comments?
>
> Looks good to me, feel free to add an:
> Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
>
> to it.
>
> David, are you going to take this through your tree?
Here it is again, respun against today's git:
driver core: Suppress sysfs warnings for device_rename().
Renaming network devices to an already existing name is not
something we want sysfs to print a scary warning for, since the
callers can deal with this correctly. So let's introduce
sysfs_create_link_nowarn() which gets rid of the common warning.
Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
---
drivers/base/core.c | 9 +++++----
fs/sysfs/dir.c | 37 +++++++++++++++++++++++++++++++++++--
fs/sysfs/symlink.c | 41 +++++++++++++++++++++++++++++++++--------
fs/sysfs/sysfs.h | 1 +
include/linux/sysfs.h | 10 ++++++++++
5 files changed, 84 insertions(+), 14 deletions(-)
--- linux-2.6.orig/drivers/base/core.c
+++ linux-2.6/drivers/base/core.c
@@ -1282,8 +1282,9 @@ int device_rename(struct device *dev, ch
if (old_class_name) {
new_class_name = make_class_name(dev->class->name, &dev->kobj);
if (new_class_name) {
- error = sysfs_create_link(&dev->parent->kobj,
- &dev->kobj, new_class_name);
+ error = sysfs_create_link_nowarn(&dev->parent->kobj,
+ &dev->kobj,
+ new_class_name);
if (error)
goto out;
sysfs_remove_link(&dev->parent->kobj, old_class_name);
@@ -1291,8 +1292,8 @@ int device_rename(struct device *dev, ch
}
#else
if (dev->class) {
- error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
- dev->bus_id);
+ error = sysfs_create_link_nowarn(&dev->class->subsys.kobj,
+ &dev->kobj, dev->bus_id);
if (error)
goto out;
sysfs_remove_link(&dev->class->subsys.kobj, old_device_name);
--- linux-2.6.orig/fs/sysfs/dir.c
+++ linux-2.6/fs/sysfs/dir.c
@@ -398,7 +398,7 @@ void sysfs_addrm_start(struct sysfs_addr
}
/**
- * sysfs_add_one - add sysfs_dirent to parent
+ * __sysfs_add_one - add sysfs_dirent to parent without warning
* @acxt: addrm context to use
* @sd: sysfs_dirent to be added
*
@@ -417,7 +417,7 @@ void sysfs_addrm_start(struct sysfs_addr
* 0 on success, -EEXIST if entry with the given name already
* exists.
*/
-int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
+int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
{
if (sysfs_find_dirent(acxt->parent_sd, sd->s_name))
return -EEXIST;
@@ -435,6 +435,39 @@ int sysfs_add_one(struct sysfs_addrm_cxt
}
/**
+ * sysfs_add_one - add sysfs_dirent to parent
+ * @acxt: addrm context to use
+ * @sd: sysfs_dirent to be added
+ *
+ * Get @acxt->parent_sd and set sd->s_parent to it and increment
+ * nlink of parent inode if @sd is a directory and link into the
+ * children list of the parent.
+ *
+ * This function should be called between calls to
+ * sysfs_addrm_start() and sysfs_addrm_finish() and should be
+ * passed the same @acxt as passed to sysfs_addrm_start().
+ *
+ * LOCKING:
+ * Determined by sysfs_addrm_start().
+ *
+ * RETURNS:
+ * 0 on success, -EEXIST if entry with the given name already
+ * exists.
+ */
+int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
+{
+ int ret;
+
+ ret = __sysfs_add_one(acxt, sd);
+ if (ret == -EEXIST) {
+ printk(KERN_WARNING "sysfs: duplicate filename '%s' "
+ "can not be created\n", sd->s_name);
+ WARN_ON(1);
+ }
+ return ret;
+}
+
+/**
* sysfs_remove_one - remove sysfs_dirent from parent
* @acxt: addrm context to use
* @sd: sysfs_dirent to be removed
--- linux-2.6.orig/fs/sysfs/symlink.c
+++ linux-2.6/fs/sysfs/symlink.c
@@ -19,13 +19,8 @@
#include "sysfs.h"
-/**
- * sysfs_create_link - create symlink between two objects.
- * @kobj: object whose directory we're creating the link in.
- * @target: object we're pointing to.
- * @name: name of the symlink.
- */
-int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name)
+static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
+ const char *name, int warn)
{
struct sysfs_dirent *parent_sd = NULL;
struct sysfs_dirent *target_sd = NULL;
@@ -65,7 +60,10 @@ int sysfs_create_link(struct kobject * k
target_sd = NULL; /* reference is now owned by the symlink */
sysfs_addrm_start(&acxt, parent_sd);
- error = sysfs_add_one(&acxt, sd);
+ if (warn)
+ error = sysfs_add_one(&acxt, sd);
+ else
+ error = __sysfs_add_one(&acxt, sd);
sysfs_addrm_finish(&acxt);
if (error)
@@ -80,6 +78,33 @@ int sysfs_create_link(struct kobject * k
}
/**
+ * sysfs_create_link - create symlink between two objects.
+ * @kobj: object whose directory we're creating the link in.
+ * @target: object we're pointing to.
+ * @name: name of the symlink.
+ */
+int sysfs_create_link(struct kobject *kobj, struct kobject *target,
+ const char *name)
+{
+ return sysfs_do_create_link(kobj, target, name, 1);
+}
+
+/**
+ * sysfs_create_link_nowarn - create symlink between two objects.
+ * @kobj: object whose directory we're creating the link in.
+ * @target: object we're pointing to.
+ * @name: name of the symlink.
+ *
+ * This function does the same as sysf_create_link(), but it
+ * doesn't warn if the link already exists.
+ */
+int sysfs_create_link_nowarn(struct kobject *kobj, struct kobject *target,
+ const char *name)
+{
+ return sysfs_do_create_link(kobj, target, name, 0);
+}
+
+/**
* sysfs_remove_link - remove symlink in object's directory.
* @kobj: object we're acting for.
* @name: name of the symlink to remove.
--- linux-2.6.orig/fs/sysfs/sysfs.h
+++ linux-2.6/fs/sysfs/sysfs.h
@@ -107,6 +107,7 @@ struct sysfs_dirent *sysfs_get_active_tw
void sysfs_put_active_two(struct sysfs_dirent *sd);
void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
struct sysfs_dirent *parent_sd);
+int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
--- linux-2.6.orig/include/linux/sysfs.h
+++ linux-2.6/include/linux/sysfs.h
@@ -101,6 +101,9 @@ void sysfs_remove_bin_file(struct kobjec
int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
const char *name);
+int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
+ struct kobject *target,
+ const char *name);
void sysfs_remove_link(struct kobject *kobj, const char *name);
int __must_check sysfs_create_group(struct kobject *kobj,
@@ -180,6 +183,13 @@ static inline int sysfs_create_link(stru
return 0;
}
+static inline int sysfs_create_link_nowarn(struct kobject *kobj,
+ struct kobject *target,
+ const char *name)
+{
+ return 0;
+}
+
static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
{
}
--
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