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authorTejun Heo <htejun@gmail.com>2007-08-02 14:38:02 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 23:51:03 +0200
commitff869de7bf5e76adffebd3a176c1c73bca7eddb7 (patch)
tree547e0a58953896eb897cdd2bf5eb89cfdfff450a /fs/sysfs
parentsysfs: cosmetic changes in sysfs_lookup() (diff)
downloadlinux-ff869de7bf5e76adffebd3a176c1c73bca7eddb7.tar.xz
linux-ff869de7bf5e76adffebd3a176c1c73bca7eddb7.zip
sysfs: simplify sysfs_rename_dir()
With the shadow directories gone, sysfs_rename_dir() can be simplified. * parent doesn't need to be grabbed separately. Just access old_dentry->d_parent. * parent sd can never change. Remove code to move under the new parent. * Massage comments a bit. Signed-off-by: Tejun Heo <htejun@gmail.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/dir.c26
1 files changed, 4 insertions, 22 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 5da8da806660..9504d4cb63eb 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -883,14 +883,10 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
struct sysfs_dirent *sd;
struct dentry *parent = NULL;
struct dentry *old_dentry = NULL, *new_dentry = NULL;
- struct sysfs_dirent *parent_sd;
const char *dup_name = NULL;
int error;
- if (!kobj->parent)
- return -EINVAL;
-
- /* get dentries */
+ /* get the original dentry */
sd = kobj->sd;
old_dentry = sysfs_get_dentry(sd);
if (IS_ERR(old_dentry)) {
@@ -898,12 +894,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
goto out_dput;
}
- parent_sd = kobj->parent->sd;
- parent = sysfs_get_dentry(parent_sd);
- if (IS_ERR(parent)) {
- error = PTR_ERR(parent);
- goto out_dput;
- }
+ parent = old_dentry->d_parent;
/* lock parent and get dentry for new name */
mutex_lock(&parent->d_inode->i_mutex);
@@ -933,22 +924,14 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
goto out_drop;
mutex_lock(&sysfs_mutex);
-
dup_name = sd->s_name;
sd->s_name = new_name;
+ mutex_unlock(&sysfs_mutex);
- /* move under the new parent */
+ /* rename */
d_add(new_dentry, NULL);
d_move(sd->s_dentry, new_dentry);
- sysfs_unlink_sibling(sd);
- sysfs_get(parent_sd);
- sysfs_put(sd->s_parent);
- sd->s_parent = parent_sd;
- sysfs_link_sibling(sd);
-
- mutex_unlock(&sysfs_mutex);
-
error = 0;
goto out_unlock;
@@ -958,7 +941,6 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
mutex_unlock(&parent->d_inode->i_mutex);
out_dput:
kfree(dup_name);
- dput(parent);
dput(old_dentry);
dput(new_dentry);
return error;