On Wed, Mar 08, 2006 at 09:58:16PM -0800, Greg KH wrote:
>
> I have a test module that shows this at:
> http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/gregkh/sysfs-test.patch
> just load the 'gregkh' module and look in /sys/class/gregkh/ to see the
> duplicate "gregkh1" directories.
>
Thnaks for the testcase, I could verify the following patch using this. I
don't see the duplicate "gregkh1" directories. Please queue it for post 2.6.16
if you are ok with it.
Thanks
Maneesh
o The following patch checks for existing sysfs_dirent before
preparing new one while creating sysfs directories and files.
Signed-off-by: Maneesh Soni <[email protected]>
---
linux-2.6.16-rc5-git12-maneesh/fs/sysfs/dir.c | 30 +++++++++++++++++++++-
linux-2.6.16-rc5-git12-maneesh/fs/sysfs/file.c | 4 ++
linux-2.6.16-rc5-git12-maneesh/fs/sysfs/symlink.c | 3 +-
linux-2.6.16-rc5-git12-maneesh/fs/sysfs/sysfs.h | 1
4 files changed, 35 insertions(+), 3 deletions(-)
diff -puN fs/sysfs/dir.c~sysfs-check-existing-sysfs_dirent fs/sysfs/dir.c
--- linux-2.6.16-rc5-git12/fs/sysfs/dir.c~sysfs-check-existing-sysfs_dirent 2006-03-09 19:19:22.655241008 +0530
+++ linux-2.6.16-rc5-git12-maneesh/fs/sysfs/dir.c 2006-03-09 19:38:52.735361792 +0530
@@ -50,6 +50,30 @@ static struct sysfs_dirent * sysfs_new_d
return sd;
}
+/**
+ *
+ * Return -EEXIST if there is already a sysfs element with the same name for
+ * the same parent.
+ *
+ * called with parent inode's i_mutex held
+ */
+int is_sysfs_dirent_exist(struct sysfs_dirent * parent_sd,
+ const unsigned char * new)
+{
+ struct sysfs_dirent * sd;
+
+ list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
+ const unsigned char * existing = sysfs_get_name(sd);
+ if (strcmp(existing, new))
+ continue;
+ else
+ return -EEXIST;
+ }
+
+ return 0;
+}
+
+
int sysfs_make_dirent(struct sysfs_dirent * parent_sd, struct dentry * dentry,
void * element, umode_t mode, int type)
{
@@ -102,7 +126,11 @@ static int create_dir(struct kobject * k
mutex_lock(&p->d_inode->i_mutex);
*d = lookup_one_len(n, p, strlen(n));
if (!IS_ERR(*d)) {
- error = sysfs_make_dirent(p->d_fsdata, *d, k, mode, SYSFS_DIR);
+ if (is_sysfs_dirent_exist(p->d_fsdata, n))
+ error = -EEXIST;
+ else
+ error = sysfs_make_dirent(p->d_fsdata, *d, k, mode,
+ SYSFS_DIR);
if (!error) {
error = sysfs_create(*d, mode, init_dir);
if (!error) {
diff -puN fs/sysfs/file.c~sysfs-check-existing-sysfs_dirent fs/sysfs/file.c
--- linux-2.6.16-rc5-git12/fs/sysfs/file.c~sysfs-check-existing-sysfs_dirent 2006-03-09 19:19:22.659240400 +0530
+++ linux-2.6.16-rc5-git12-maneesh/fs/sysfs/file.c 2006-03-09 19:19:22.676237816 +0530
@@ -365,7 +365,9 @@ int sysfs_add_file(struct dentry * dir,
int error = 0;
mutex_lock(&dir->d_inode->i_mutex);
- error = sysfs_make_dirent(parent_sd, NULL, (void *) attr, mode, type);
+ if (!is_sysfs_dirent_exist(parent_sd, attr->name))
+ error = sysfs_make_dirent(parent_sd, NULL, (void *) attr,
+ mode, type);
mutex_unlock(&dir->d_inode->i_mutex);
return error;
diff -puN fs/sysfs/symlink.c~sysfs-check-existing-sysfs_dirent fs/sysfs/symlink.c
--- linux-2.6.16-rc5-git12/fs/sysfs/symlink.c~sysfs-check-existing-sysfs_dirent 2006-03-09 19:19:22.663239792 +0530
+++ linux-2.6.16-rc5-git12-maneesh/fs/sysfs/symlink.c 2006-03-09 19:19:22.677237664 +0530
@@ -87,7 +87,8 @@ int sysfs_create_link(struct kobject * k
BUG_ON(!kobj || !kobj->dentry || !name);
mutex_lock(&dentry->d_inode->i_mutex);
- error = sysfs_add_link(dentry, name, target);
+ if (!is_sysfs_dirent_exist(dentry->d_fsdata, name))
+ error = sysfs_add_link(dentry, name, target);
mutex_unlock(&dentry->d_inode->i_mutex);
return error;
}
diff -puN fs/sysfs/sysfs.h~sysfs-check-existing-sysfs_dirent fs/sysfs/sysfs.h
--- linux-2.6.16-rc5-git12/fs/sysfs/sysfs.h~sysfs-check-existing-sysfs_dirent 2006-03-09 19:19:22.666239336 +0530
+++ linux-2.6.16-rc5-git12-maneesh/fs/sysfs/sysfs.h 2006-03-09 19:28:52.404625936 +0530
@@ -5,6 +5,7 @@ extern kmem_cache_t *sysfs_dir_cachep;
extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
+extern int is_sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char * );
extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
umode_t, int);
_
--
Maneesh Soni
Linux Technology Center,
IBM India Software Labs,
Bangalore, India
email: [email protected]
Phone: 91-80-51776416
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