sysfs: Remove s_dentry
The only uses of s_dentry left are the code that maintains
s_dentry and trivial users that don't actually need it.
So this patch removes the s_dentry maintenance code and
restructures the trivial uses to use something else.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 1c3dc5d..36b6c79 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -289,22 +289,7 @@
{
struct sysfs_dirent * sd = dentry->d_fsdata;
- if (sd) {
- /* sd->s_dentry is protected with sysfs_assoc_lock.
- * This allows sysfs_drop_dentry() to dereference it.
- */
- spin_lock(&sysfs_assoc_lock);
-
- /* The dentry might have been deleted or another
- * lookup could have happened updating sd->s_dentry to
- * point the new dentry. Ignore if it isn't pointing
- * to this dentry.
- */
- if (sd->s_dentry == dentry)
- sd->s_dentry = NULL;
- spin_unlock(&sysfs_assoc_lock);
- sysfs_put(sd);
- }
+ sysfs_put(sd);
iput(inode);
}
@@ -352,9 +337,6 @@
* @sd: target sysfs_dirent
* @dentry: dentry to associate
*
- * Associate @sd with @dentry. This is protected by
- * sysfs_assoc_lock to avoid race with sysfs_d_iput().
- *
* LOCKING:
* mutex_lock(sysfs_mutex)
*/
@@ -362,12 +344,6 @@
{
dentry->d_op = &sysfs_dentry_ops;
dentry->d_fsdata = sysfs_get(sd);
-
- /* protect sd->s_dentry against sysfs_d_iput */
- spin_lock(&sysfs_assoc_lock);
- sd->s_dentry = dentry;
- spin_unlock(&sysfs_assoc_lock);
-
d_rehash(dentry);
}
@@ -846,7 +822,7 @@
/* rename */
d_add(new_dentry, NULL);
- d_move(sd->s_dentry, new_dentry);
+ d_move(old_dentry, new_dentry);
error = 0;
goto out_unlock;
@@ -881,7 +857,7 @@
error = PTR_ERR(old_dentry);
goto out_dput;
}
- old_parent = sd->s_parent->s_dentry;
+ old_parent = old_dentry->d_parent;
new_parent = sysfs_get_dentry(new_parent_sd);
if (IS_ERR(new_parent)) {
@@ -907,7 +883,7 @@
} else
error = 0;
d_add(new_dentry, NULL);
- d_move(sd->s_dentry, new_dentry);
+ d_move(old_dentry, new_dentry);
dput(new_dentry);
/* Remove from old parent's list and insert into new parent's list. */