sysfs: make kobj point to sysfs_dirent instead of dentry

As kobj sysfs dentries and inodes are gonna be made reclaimable,
dentry can't be used as naming token for sysfs file/directory, replace
kobj->dentry with kobj->sd.  The only external interface change is
shadow directory handling.  All other changes are contained in kobj
and sysfs.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 24 insertions, 23 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index e448b88e313e..20703b9ee064 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -385,7 +385,7 @@ static struct dentry *step_down(struct dentry *dir, const char * name)
 
 void sysfs_notify(struct kobject * k, char *dir, char *attr)
 {
-        struct dentry *de = k->dentry;
+        struct dentry *de = k->sd->s_dentry;
         if (de)
                 dget(de);
         if (de && dir)
@@ -412,16 +412,17 @@ const struct file_operations sysfs_file_operations = {
 };
 
 
-int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type)
+int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
+                   int type)
 {
-        struct sysfs_dirent * parent_sd = dir->d_fsdata;
+        struct dentry *dir = dir_sd->s_dentry;
         umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
         struct sysfs_dirent *sd;
         int error = 0;
 
         mutex_lock(&dir->d_inode->i_mutex);
 
-        if (sysfs_find_dirent(parent_sd, attr->name)) {
+        if (sysfs_find_dirent(dir_sd, attr->name)) {
                 error = -EEXIST;
                 goto out_unlock;
         }
@@ -432,7 +433,7 @@ int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type)
                 goto out_unlock;
         }
         sd->s_elem.attr.attr = (void *)attr;
-        sysfs_attach_dirent(sd, parent_sd, NULL);
+        sysfs_attach_dirent(sd, dir_sd, NULL);
 
  out_unlock:
         mutex_unlock(&dir->d_inode->i_mutex);
@@ -448,9 +449,9 @@ int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type)
 
 int sysfs_create_file(struct kobject * kobj, const struct attribute * attr)
 {
-        BUG_ON(!kobj || !kobj->dentry || !attr);
+        BUG_ON(!kobj || !kobj->sd || !attr);
 
-        return sysfs_add_file(kobj->dentry, attr, SYSFS_KOBJ_ATTR);
+        return sysfs_add_file(kobj->sd, attr, SYSFS_KOBJ_ATTR);
 
 }
 
@@ -464,16 +465,16 @@ int sysfs_create_file(struct kobject * kobj, const struct attribute * attr)
 int sysfs_add_file_to_group(struct kobject *kobj,
                 const struct attribute *attr, const char *group)
 {
-        struct dentry *dir;
+        struct sysfs_dirent *dir_sd;
         int error;
 
-        dir = lookup_one_len(group, kobj->dentry, strlen(group));
-        if (IS_ERR(dir))
-                error = PTR_ERR(dir);
-        else {
-                error = sysfs_add_file(dir, attr, SYSFS_KOBJ_ATTR);
-                dput(dir);
-        }
+        dir_sd = sysfs_get_dirent(kobj->sd, group);
+        if (!dir_sd)
+                return -ENOENT;
+
+        error = sysfs_add_file(dir_sd, attr, SYSFS_KOBJ_ATTR);
+        sysfs_put(dir_sd);
+
         return error;
 }
 EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
@@ -486,7 +487,7 @@ EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
  */
 int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
 {
-        struct dentry * dir = kobj->dentry;
+        struct dentry *dir = kobj->sd->s_dentry;
         struct dentry * victim;
         int res = -ENOENT;
 
@@ -522,7 +523,7 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
  */
 int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
 {
-        struct dentry *dir = kobj->dentry;
+        struct dentry *dir = kobj->sd->s_dentry;
         struct dentry *victim;
         struct inode * inode;
         struct iattr newattrs;
@@ -560,7 +561,7 @@ EXPORT_SYMBOL_GPL(sysfs_chmod_file);
 
 void sysfs_remove_file(struct kobject * kobj, const struct attribute * attr)
 {
-        sysfs_hash_and_remove(kobj->dentry, attr->name);
+        sysfs_hash_and_remove(kobj->sd, attr->name);
 }
 
 
@@ -573,12 +574,12 @@ void sysfs_remove_file(struct kobject * kobj, const struct attribute * attr)
 void sysfs_remove_file_from_group(struct kobject *kobj,
                 const struct attribute *attr, const char *group)
 {
-        struct dentry *dir;
+        struct sysfs_dirent *dir_sd;
 
-        dir = lookup_one_len(group, kobj->dentry, strlen(group));
-        if (!IS_ERR(dir)) {
-                sysfs_hash_and_remove(dir, attr->name);
-                dput(dir);
+        dir_sd = sysfs_get_dirent(kobj->sd, group);
+        if (dir_sd) {
+                sysfs_hash_and_remove(dir_sd, attr->name);
+                sysfs_put(dir_sd);
         }
 }
 EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group);