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>

10 files changed, 156 insertions, 152 deletions

diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 3c5574a40b09..55796bdacd3d 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -234,9 +234,9 @@ const struct file_operations bin_fops = {
 
 int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr)
 {
-        BUG_ON(!kobj || !kobj->dentry || !attr);
+        BUG_ON(!kobj || !kobj->sd || !attr);
 
-        return sysfs_add_file(kobj->dentry, &attr->attr, SYSFS_KOBJ_BIN_ATTR);
+        return sysfs_add_file(kobj->sd, &attr->attr, SYSFS_KOBJ_BIN_ATTR);
 }
 
 
@@ -248,7 +248,7 @@ int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr)
 
 void sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr)
 {
-        if (sysfs_hash_and_remove(kobj->dentry, attr->attr.name) < 0) {
+        if (sysfs_hash_and_remove(kobj->sd, attr->attr.name) < 0) {
                 printk(KERN_ERR "%s: "
                         "bad dentry or inode or no such file: \"%s\"\n",
                         __FUNCTION__, attr->attr.name);
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 4762a9aa0b27..31b6cf30636d 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -368,9 +368,10 @@ struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
         return sd;
 }
 
-static int create_dir(struct kobject *kobj, struct dentry *parent,
-                      const char *name, struct dentry **p_dentry)
+static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
+                      const char *name, struct sysfs_dirent **p_sd)
 {
+        struct dentry *parent = parent_sd->s_dentry;
         int error;
         umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
         struct dentry *dentry;
@@ -409,14 +410,14 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
 
         /* link in */
         error = -EEXIST;
-        if (sysfs_find_dirent(parent->d_fsdata, name))
+        if (sysfs_find_dirent(parent_sd, name))
                 goto out_iput;
 
         sysfs_instantiate(dentry, inode);
         inc_nlink(parent->d_inode);
-        sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
+        sysfs_attach_dirent(sd, parent_sd, dentry);
 
-        *p_dentry = dentry;
+        *p_sd = sd;
         error = 0;
         goto out_unlock;        /* pin directory dentry in core */
 
@@ -433,38 +434,37 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
         return error;
 }
 
-
-int sysfs_create_subdir(struct kobject * k, const char * n, struct dentry ** d)
+int sysfs_create_subdir(struct kobject *kobj, const char *name,
+                        struct sysfs_dirent **p_sd)
 {
-        return create_dir(k,k->dentry,n,d);
+        return create_dir(kobj, kobj->sd, name, p_sd);
 }
 
 /**
  *      sysfs_create_dir - create a directory for an object.
  *      @kobj:          object we're creating directory for. 
- *      @shadow_parent: parent parent object.
+ *      @shadow_parent: parent object.
  */
-
-int sysfs_create_dir(struct kobject * kobj, struct dentry *shadow_parent)
+int sysfs_create_dir(struct kobject *kobj,
+                     struct sysfs_dirent *shadow_parent_sd)
 {
-        struct dentry * dentry = NULL;
-        struct dentry * parent;
+        struct sysfs_dirent *parent_sd, *sd;
         int error = 0;
 
         BUG_ON(!kobj);
 
-        if (shadow_parent)
-                parent = shadow_parent;
+        if (shadow_parent_sd)
+                parent_sd = shadow_parent_sd;
         else if (kobj->parent)
-                parent = kobj->parent->dentry;
+                parent_sd = kobj->parent->sd;
         else if (sysfs_mount && sysfs_mount->mnt_sb)
-                parent = sysfs_mount->mnt_sb->s_root;
+                parent_sd = sysfs_mount->mnt_sb->s_root->d_fsdata;
         else
                 return -EFAULT;
 
-        error = create_dir(kobj,parent,kobject_name(kobj),&dentry);
+        error = create_dir(kobj, parent_sd, kobject_name(kobj), &sd);
         if (!error)
-                kobj->dentry = dentry;
+                kobj->sd = sd;
         return error;
 }
 
@@ -525,18 +525,16 @@ const struct inode_operations sysfs_dir_inode_operations = {
         .setattr        = sysfs_setattr,
 };
 
-static void remove_dir(struct dentry * d)
+static void remove_dir(struct sysfs_dirent *sd)
 {
-        struct dentry *parent = d->d_parent;
-        struct sysfs_dirent *sd = d->d_fsdata;
+        struct dentry *parent = sd->s_parent->s_dentry;
 
         mutex_lock(&parent->d_inode->i_mutex);
 
         sysfs_unlink_sibling(sd);
         sd->s_flags |= SYSFS_FLAG_REMOVED;
 
-        pr_debug(" o %s removing done (%d)\n",d->d_name.name,
-                 atomic_read(&d->d_count));
+        pr_debug(" o %s removing done\n", sd->s_name);
 
         mutex_unlock(&parent->d_inode->i_mutex);
 
@@ -545,25 +543,26 @@ static void remove_dir(struct dentry * d)
         sysfs_put(sd);
 }
 
-void sysfs_remove_subdir(struct dentry * d)
+void sysfs_remove_subdir(struct sysfs_dirent *sd)
 {
-        remove_dir(d);
+        remove_dir(sd);
 }
 
 
-static void __sysfs_remove_dir(struct dentry *dentry)
+static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd)
 {
         struct sysfs_dirent *removed = NULL;
-        struct sysfs_dirent *parent_sd;
         struct sysfs_dirent **pos;
+        struct dentry *dir;
 
-        if (!dentry)
+        if (!dir_sd)
                 return;
 
-        pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
-        mutex_lock(&dentry->d_inode->i_mutex);
-        parent_sd = dentry->d_fsdata;
-        pos = &parent_sd->s_children;
+        dir = dir_sd->s_dentry;
+
+        pr_debug("sysfs %s: removing dir\n", dir_sd->s_name);
+        mutex_lock(&dir->d_inode->i_mutex);
+        pos = &dir_sd->s_children;
         while (*pos) {
                 struct sysfs_dirent *sd = *pos;
 
@@ -575,7 +574,7 @@ static void __sysfs_remove_dir(struct dentry *dentry)
                 } else
                         pos = &(*pos)->s_sibling;
         }
-        mutex_unlock(&dentry->d_inode->i_mutex);
+        mutex_unlock(&dir->d_inode->i_mutex);
 
         while (removed) {
                 struct sysfs_dirent *sd = removed;
@@ -588,7 +587,7 @@ static void __sysfs_remove_dir(struct dentry *dentry)
                 sysfs_put(sd);
         }
 
-        remove_dir(dentry);
+        remove_dir(dir_sd);
 }
 
 /**
@@ -602,25 +601,25 @@ static void __sysfs_remove_dir(struct dentry *dentry)
 
 void sysfs_remove_dir(struct kobject * kobj)
 {
-        struct dentry *d = kobj->dentry;
+        struct sysfs_dirent *sd = kobj->sd;
 
         spin_lock(&kobj_sysfs_assoc_lock);
-        kobj->dentry = NULL;
+        kobj->sd = NULL;
         spin_unlock(&kobj_sysfs_assoc_lock);
 
-        __sysfs_remove_dir(d);
+        __sysfs_remove_dir(sd);
 }
 
-int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
+int sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
                      const char *new_name)
 {
-        struct sysfs_dirent *sd = kobj->dentry->d_fsdata;
-        struct sysfs_dirent *parent_sd = new_parent->d_fsdata;
+        struct sysfs_dirent *sd = kobj->sd;
+        struct dentry *new_parent = new_parent_sd->s_dentry;
         struct dentry *new_dentry;
         char *dup_name;
         int error;
 
-        if (!new_parent)
+        if (!new_parent_sd)
                 return -EFAULT;
 
         down_write(&sysfs_rename_sem);
@@ -637,9 +636,9 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
          * shadows of the same directory
          */
         error = -EINVAL;
-        if (kobj->dentry->d_parent->d_inode != new_parent->d_inode ||
+        if (sd->s_parent->s_dentry->d_inode != new_parent->d_inode ||
             new_dentry->d_parent->d_inode != new_parent->d_inode ||
-            new_dentry == kobj->dentry)
+            new_dentry == sd->s_dentry)
                 goto out_dput;
 
         error = -EEXIST;
@@ -661,12 +660,12 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
 
         /* move under the new parent */
         d_add(new_dentry, NULL);
-        d_move(kobj->dentry, new_dentry);
+        d_move(sd->s_dentry, new_dentry);
 
         sysfs_unlink_sibling(sd);
-        sysfs_get(parent_sd);
+        sysfs_get(new_parent_sd);
         sysfs_put(sd->s_parent);
-        sd->s_parent = parent_sd;
+        sd->s_parent = new_parent_sd;
         sysfs_link_sibling(sd);
 
         error = 0;
@@ -691,9 +690,9 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent)
         int error;
 
         old_parent_dentry = kobj->parent ?
-                kobj->parent->dentry : sysfs_mount->mnt_sb->s_root;
+                kobj->parent->sd->s_dentry : sysfs_mount->mnt_sb->s_root;
         new_parent_dentry = new_parent ?
-                new_parent->dentry : sysfs_mount->mnt_sb->s_root;
+                new_parent->sd->s_dentry : sysfs_mount->mnt_sb->s_root;
 
         if (old_parent_dentry->d_inode == new_parent_dentry->d_inode)
                 return 0;       /* nothing to move */
@@ -705,7 +704,7 @@ again:
         }
 
         new_parent_sd = new_parent_dentry->d_fsdata;
-        sd = kobj->dentry->d_fsdata;
+        sd = kobj->sd;
 
         new_dentry = lookup_one_len(kobj->name, new_parent_dentry,
                                     strlen(kobj->name));
@@ -715,7 +714,7 @@ again:
         } else
                 error = 0;
         d_add(new_dentry, NULL);
-        d_move(kobj->dentry, new_dentry);
+        d_move(sd->s_dentry, new_dentry);
         dput(new_dentry);
 
         /* Remove from old parent's list and insert into new parent's list. */
@@ -885,7 +884,7 @@ int sysfs_make_shadowed_dir(struct kobject *kobj,
         struct inode *inode;
         struct inode_operations *i_op;
 
-        inode = kobj->dentry->d_inode;
+        inode = kobj->sd->s_dentry->d_inode;
         if (inode->i_op != &sysfs_dir_inode_operations)
                 return -EINVAL;
 
@@ -912,16 +911,16 @@ int sysfs_make_shadowed_dir(struct kobject *kobj,
  *      directory.
  */
 
-struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
+struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj)
 {
-        struct dentry *dir = kobj->dentry;
+        struct dentry *dir = kobj->sd->s_dentry;
         struct inode *inode = dir->d_inode;
         struct dentry *parent = dir->d_parent;
         struct sysfs_dirent *parent_sd = parent->d_fsdata;
         struct dentry *shadow;
         struct sysfs_dirent *sd;
 
-        shadow = ERR_PTR(-EINVAL);
+        sd = ERR_PTR(-EINVAL);
         if (!sysfs_is_shadowed_inode(inode))
                 goto out;
 
@@ -944,25 +943,25 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
         dget(shadow);           /* Extra count - pin the dentry in core */
 
 out:
-        return shadow;
+        return sd;
 nomem:
         dput(shadow);
-        shadow = ERR_PTR(-ENOMEM);
+        sd = ERR_PTR(-ENOMEM);
         goto out;
 }
 
 /**
  *      sysfs_remove_shadow_dir - remove an object's directory.
- *      @shadow: dentry of shadow directory
+ *      @shadow_sd: sysfs_dirent of shadow directory
  *
  *      The only thing special about this is that we remove any files in
  *      the directory before we remove the directory, and we've inlined
  *      what used to be sysfs_rmdir() below, instead of calling separately.
  */
 
-void sysfs_remove_shadow_dir(struct dentry *shadow)
+void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd)
 {
-        __sysfs_remove_dir(shadow);
+        __sysfs_remove_dir(shadow_sd);
 }
 
 const struct file_operations sysfs_dir_operations = {
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);
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 52eed2a7a5ef..f318b73c790c 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -18,26 +18,25 @@
 #include "sysfs.h"
 
 
-static void remove_files(struct dentry * dir, 
-                         const struct attribute_group * grp)
+static void remove_files(struct sysfs_dirent *dir_sd,
+                         const struct attribute_group *grp)
 {
         struct attribute *const* attr;
 
         for (attr = grp->attrs; *attr; attr++)
-                sysfs_hash_and_remove(dir,(*attr)->name);
+                sysfs_hash_and_remove(dir_sd, (*attr)->name);
 }
 
-static int create_files(struct dentry * dir,
-                        const struct attribute_group * grp)
+static int create_files(struct sysfs_dirent *dir_sd,
+                        const struct attribute_group *grp)
 {
         struct attribute *const* attr;
         int error = 0;
 
-        for (attr = grp->attrs; *attr && !error; attr++) {
-                error = sysfs_add_file(dir, *attr, SYSFS_KOBJ_ATTR);
-        }
+        for (attr = grp->attrs; *attr && !error; attr++)
+                error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
         if (error)
-                remove_files(dir,grp);
+                remove_files(dir_sd, grp);
         return error;
 }
 
@@ -45,44 +44,44 @@ static int create_files(struct dentry * dir,
 int sysfs_create_group(struct kobject * kobj, 
                        const struct attribute_group * grp)
 {
-        struct dentry * dir;
+        struct sysfs_dirent *sd;
         int error;
 
-        BUG_ON(!kobj || !kobj->dentry);
+        BUG_ON(!kobj || !kobj->sd);
 
         if (grp->name) {
-                error = sysfs_create_subdir(kobj,grp->name,&dir);
+                error = sysfs_create_subdir(kobj, grp->name, &sd);
                 if (error)
                         return error;
         } else
-                dir = kobj->dentry;
-        dir = dget(dir);
-        if ((error = create_files(dir,grp))) {
+                sd = kobj->sd;
+        sysfs_get(sd);
+        error = create_files(sd, grp);
+        if (error) {
                 if (grp->name)
-                        sysfs_remove_subdir(dir);
+                        sysfs_remove_subdir(sd);
         }
-        dput(dir);
+        sysfs_put(sd);
         return error;
 }
 
 void sysfs_remove_group(struct kobject * kobj, 
                         const struct attribute_group * grp)
 {
-        struct dentry * dir;
+        struct sysfs_dirent *dir_sd = kobj->sd;
+        struct sysfs_dirent *sd;
 
         if (grp->name) {
-                dir = lookup_one_len_kern(grp->name, kobj->dentry,
-                                strlen(grp->name));
-                BUG_ON(IS_ERR(dir));
-        }
-        else
-                dir = dget(kobj->dentry);
+                sd = sysfs_get_dirent(dir_sd, grp->name);
+                BUG_ON(!sd);
+        } else
+                sd = sysfs_get(dir_sd);
 
-        remove_files(dir,grp);
+        remove_files(sd, grp);
         if (grp->name)
-                sysfs_remove_subdir(dir);
-        /* release the ref. taken in this routine */
-        dput(dir);
+                sysfs_remove_subdir(sd);
+
+        sysfs_put(sd);
 }
 
 
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index e2f6ef138d20..1be853706e99 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -275,22 +275,23 @@ void sysfs_drop_dentry(struct sysfs_dirent *sd)
         }
 }
 
-int sysfs_hash_and_remove(struct dentry * dir, const char * name)
+int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
 {
+        struct dentry *dir;
         struct sysfs_dirent **pos, *sd;
-        struct sysfs_dirent *parent_sd;
         int found = 0;
 
-        if (!dir)
+        if (!dir_sd)
                 return -ENOENT;
 
+        dir = dir_sd->s_dentry;
+
         if (dir->d_inode == NULL)
                 /* no inode means this hasn't been made visible yet */
                 return -ENOENT;
 
-        parent_sd = dir->d_fsdata;
         mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
-        for (pos = &parent_sd->s_children; *pos; pos = &(*pos)->s_sibling) {
+        for (pos = &dir_sd->s_children; *pos; pos = &(*pos)->s_sibling) {
                 sd = *pos;
 
                 if (!sysfs_type(sd))
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 45b62e229627..43cc5222f136 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -66,7 +66,6 @@ static int sysfs_add_link(struct sysfs_dirent * parent_sd, const char * name,
  */
 int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name)
 {
-        struct dentry *dentry = NULL;
         struct sysfs_dirent *parent_sd = NULL;
         struct sysfs_dirent *target_sd = NULL;
         int error = -EEXIST;
@@ -75,29 +74,28 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char
 
         if (!kobj) {
                 if (sysfs_mount && sysfs_mount->mnt_sb)
-                        dentry = sysfs_mount->mnt_sb->s_root;
+                        parent_sd = sysfs_mount->mnt_sb->s_root->d_fsdata;
         } else
-                dentry = kobj->dentry;
+                parent_sd = kobj->sd;
 
-        if (!dentry)
+        if (!parent_sd)
                 return -EFAULT;
-        parent_sd = dentry->d_fsdata;
 
-        /* target->dentry can go away beneath us but is protected with
+        /* target->sd can go away beneath us but is protected with
          * kobj_sysfs_assoc_lock.  Fetch target_sd from it.
          */
         spin_lock(&kobj_sysfs_assoc_lock);
-        if (target->dentry)
-                target_sd = sysfs_get(target->dentry->d_fsdata);
+        if (target->sd)
+                target_sd = sysfs_get(target->sd);
         spin_unlock(&kobj_sysfs_assoc_lock);
 
         if (!target_sd)
                 return -ENOENT;
 
-        mutex_lock(&dentry->d_inode->i_mutex);
-        if (!sysfs_find_dirent(dentry->d_fsdata, name))
+        mutex_lock(&parent_sd->s_dentry->d_inode->i_mutex);
+        if (!sysfs_find_dirent(parent_sd, name))
                 error = sysfs_add_link(parent_sd, name, target_sd);
-        mutex_unlock(&dentry->d_inode->i_mutex);
+        mutex_unlock(&parent_sd->s_dentry->d_inode->i_mutex);
 
         if (error)
                 sysfs_put(target_sd);
@@ -114,7 +112,7 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char
 
 void sysfs_remove_link(struct kobject * kobj, const char * name)
 {
-        sysfs_hash_and_remove(kobj->dentry,name);
+        sysfs_hash_and_remove(kobj->sd, name);
 }
 
 static int sysfs_get_target_path(struct sysfs_dirent * parent_sd,
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index f1629b4520aa..27a5f4b4e3b0 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -69,12 +69,14 @@ extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
                                 struct sysfs_dirent *parent_sd,
                                 struct dentry *dentry);
 
-extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
-extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
+extern int sysfs_add_file(struct sysfs_dirent *dir_sd,
+                          const struct attribute *attr, int type);
+extern int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
 
-extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
-extern void sysfs_remove_subdir(struct dentry *);
+extern int sysfs_create_subdir(struct kobject *kobj, const char *name,
+                               struct sysfs_dirent **p_sd);
+extern void sysfs_remove_subdir(struct sysfs_dirent *sd);
 
 extern void sysfs_drop_dentry(struct sysfs_dirent *sd);
 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index c288e41ba331..06cbf41d32d2 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -55,7 +55,7 @@ struct kobject {
         struct kobject          * parent;
         struct kset             * kset;
         struct kobj_type        * ktype;
-        struct dentry           * dentry;
+        struct sysfs_dirent     * sd;
         wait_queue_head_t       poll;
 };
 
@@ -71,13 +71,14 @@ extern void kobject_init(struct kobject *);
 extern void kobject_cleanup(struct kobject *);
 
 extern int __must_check kobject_add(struct kobject *);
-extern int __must_check kobject_shadow_add(struct kobject *, struct dentry *);
+extern int __must_check kobject_shadow_add(struct kobject *kobj,
+                                           struct sysfs_dirent *shadow_parent);
 extern void kobject_del(struct kobject *);
 
 extern int __must_check kobject_rename(struct kobject *, const char *new_name);
 extern int __must_check kobject_shadow_rename(struct kobject *kobj,
-                                                struct dentry *new_parent,
-                                                const char *new_name);
+                                              struct sysfs_dirent *new_parent,
+                                              const char *new_name);
 extern int __must_check kobject_move(struct kobject *, struct kobject *);
 
 extern int __must_check kobject_register(struct kobject *);
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 2a6df6444e69..4c43030fae5d 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -19,6 +19,7 @@ struct kobject;
 struct module;
 struct nameidata;
 struct dentry;
+struct sysfs_dirent;
 
 /* FIXME
  * The *owner field is no longer used, but leave around
@@ -92,13 +93,14 @@ extern int sysfs_schedule_callback(struct kobject *kobj,
                 void (*func)(void *), void *data, struct module *owner);
 
 extern int __must_check
-sysfs_create_dir(struct kobject *, struct dentry *);
+sysfs_create_dir(struct kobject *kobj, struct sysfs_dirent *shadow_parent_sd);
 
 extern void
 sysfs_remove_dir(struct kobject *);
 
 extern int __must_check
-sysfs_rename_dir(struct kobject *, struct dentry *, const char *new_name);
+sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
+                 const char *new_name);
 
 extern int __must_check
 sysfs_move_dir(struct kobject *, struct kobject *);
@@ -138,8 +140,8 @@ void sysfs_notify(struct kobject * k, char *dir, char *attr);
 
 extern int sysfs_make_shadowed_dir(struct kobject *kobj,
         void * (*follow_link)(struct dentry *, struct nameidata *));
-extern struct dentry *sysfs_create_shadow_dir(struct kobject *kobj);
-extern void sysfs_remove_shadow_dir(struct dentry *dir);
+extern struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj);
+extern void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd);
 
 extern int __must_check sysfs_init(void);
 
@@ -151,7 +153,8 @@ static inline int sysfs_schedule_callback(struct kobject *kobj,
         return -ENOSYS;
 }
 
-static inline int sysfs_create_dir(struct kobject * k, struct dentry *shadow)
+static inline int sysfs_create_dir(struct kobject *kobj,
+                                   struct sysfs_dirent *shadow_parent_sd)
 {
         return 0;
 }
@@ -161,9 +164,9 @@ static inline void sysfs_remove_dir(struct kobject * k)
         ;
 }
 
-static inline int sysfs_rename_dir(struct kobject * k,
-                                        struct dentry *new_parent,
-                                        const char *new_name)
+static inline int sysfs_rename_dir(struct kobject *kobj,
+                                   struct sysfs_dirent *new_parent_sd,
+                                   const char *new_name)
 {
         return 0;
 }
diff --git a/lib/kobject.c b/lib/kobject.c
index b4ebd7631700..4b08e0ff95c8 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -44,7 +44,7 @@ static int populate_dir(struct kobject * kobj)
         return error;
 }
 
-static int create_dir(struct kobject * kobj, struct dentry *shadow_parent)
+static int create_dir(struct kobject *kobj, struct sysfs_dirent *shadow_parent)
 {
         int error = 0;
         if (kobject_name(kobj)) {
@@ -162,7 +162,7 @@ static void unlink(struct kobject * kobj)
  *      @shadow_parent: sysfs directory to add to.
  */
 
-int kobject_shadow_add(struct kobject * kobj, struct dentry *shadow_parent)
+int kobject_shadow_add(struct kobject *kobj, struct sysfs_dirent *shadow_parent)
 {
         int error = 0;
         struct kobject * parent;
@@ -338,7 +338,7 @@ int kobject_rename(struct kobject * kobj, const char *new_name)
         /* Note : if we want to send the new name alone, not the full path,
          * we could probably use kobject_name(kobj); */
 
-        error = sysfs_rename_dir(kobj, kobj->parent->dentry, new_name);
+        error = sysfs_rename_dir(kobj, kobj->parent->sd, new_name);
 
         /* This function is mostly/only used for network interface.
          * Some hotplug package track interfaces by their name and
@@ -361,8 +361,8 @@ out:
  *      @new_name: object's new name
  */
 
-int kobject_shadow_rename(struct kobject * kobj, struct dentry *new_parent,
-                          const char *new_name)
+int kobject_shadow_rename(struct kobject *kobj,
+                          struct sysfs_dirent *new_parent, const char *new_name)
 {
         int error = 0;