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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>
This commit is contained in:
Tejun Heo 2007-08-02 21:38:02 +09:00 committed by Greg Kroah-Hartman
parent a7a0475497
commit ff869de7bf
1 changed files with 4 additions and 22 deletions
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26
fs/sysfs/dir.c
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@ -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;