1 files changed, 40 insertions, 1063 deletions

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 5e73d6626e50..0b45ff42f374 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -13,721 +13,24 @@
 #undef DEBUG
 
 #include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/module.h>
 #include <linux/kobject.h>
-#include <linux/namei.h>
-#include <linux/idr.h>
-#include <linux/completion.h>
-#include <linux/mutex.h>
 #include <linux/slab.h>
-#include <linux/security.h>
-#include <linux/hash.h>
 #include "sysfs.h"
 
-DEFINE_MUTEX(sysfs_mutex);
 DEFINE_SPINLOCK(sysfs_symlink_target_lock);
 
-#define to_sysfs_dirent(X) rb_entry((X), struct sysfs_dirent, s_rb)
-
-static DEFINE_SPINLOCK(sysfs_ino_lock);
-static DEFINE_IDA(sysfs_ino_ida);
-
-/**
- *	sysfs_name_hash
- *	@name: Null terminated string to hash
- *	@ns:   Namespace tag to hash
- *
- *	Returns 31 bit hash of ns + name (so it fits in an off_t )
- */
-static unsigned int sysfs_name_hash(const char *name, const void *ns)
-{
-	unsigned long hash = init_name_hash();
-	unsigned int len = strlen(name);
-	while (len--)
-		hash = partial_name_hash(*name++, hash);
-	hash = (end_name_hash(hash) ^ hash_ptr((void *)ns, 31));
-	hash &= 0x7fffffffU;
-	/* Reserve hash numbers 0, 1 and INT_MAX for magic directory entries */
-	if (hash < 1)
-		hash += 2;
-	if (hash >= INT_MAX)
-		hash = INT_MAX - 1;
-	return hash;
-}
-
-static int sysfs_name_compare(unsigned int hash, const char *name,
-			      const void *ns, const struct sysfs_dirent *sd)
-{
-	if (hash != sd->s_hash)
-		return hash - sd->s_hash;
-	if (ns != sd->s_ns)
-		return ns - sd->s_ns;
-	return strcmp(name, sd->s_name);
-}
-
-static int sysfs_sd_compare(const struct sysfs_dirent *left,
-			    const struct sysfs_dirent *right)
-{
-	return sysfs_name_compare(left->s_hash, left->s_name, left->s_ns,
-				  right);
-}
-
-/**
- *	sysfs_link_sibling - link sysfs_dirent into sibling rbtree
- *	@sd: sysfs_dirent of interest
- *
- *	Link @sd into its sibling rbtree which starts from
- *	sd->s_parent->s_dir.children.
- *
- *	Locking:
- *	mutex_lock(sysfs_mutex)
- *
- *	RETURNS:
- *	0 on susccess -EEXIST on failure.
- */
-static int sysfs_link_sibling(struct sysfs_dirent *sd)
-{
-	struct rb_node **node = &sd->s_parent->s_dir.children.rb_node;
-	struct rb_node *parent = NULL;
-
-	if (sysfs_type(sd) == SYSFS_DIR)
-		sd->s_parent->s_dir.subdirs++;
-
-	while (*node) {
-		struct sysfs_dirent *pos;
-		int result;
-
-		pos = to_sysfs_dirent(*node);
-		parent = *node;
-		result = sysfs_sd_compare(sd, pos);
-		if (result < 0)
-			node = &pos->s_rb.rb_left;
-		else if (result > 0)
-			node = &pos->s_rb.rb_right;
-		else
-			return -EEXIST;
-	}
-	/* add new node and rebalance the tree */
-	rb_link_node(&sd->s_rb, parent, node);
-	rb_insert_color(&sd->s_rb, &sd->s_parent->s_dir.children);
-	return 0;
-}
-
-/**
- *	sysfs_unlink_sibling - unlink sysfs_dirent from sibling rbtree
- *	@sd: sysfs_dirent of interest
- *
- *	Unlink @sd from its sibling rbtree which starts from
- *	sd->s_parent->s_dir.children.
- *
- *	Locking:
- *	mutex_lock(sysfs_mutex)
- */
-static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
-{
-	if (sysfs_type(sd) == SYSFS_DIR)
-		sd->s_parent->s_dir.subdirs--;
-
-	rb_erase(&sd->s_rb, &sd->s_parent->s_dir.children);
-}
-
-/**
- *	sysfs_get_active - get an active reference to sysfs_dirent
- *	@sd: sysfs_dirent to get an active reference to
- *
- *	Get an active reference of @sd.  This function is noop if @sd
- *	is NULL.
- *
- *	RETURNS:
- *	Pointer to @sd on success, NULL on failure.
- */
-struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
-{
-	if (unlikely(!sd))
-		return NULL;
-
-	if (!atomic_inc_unless_negative(&sd->s_active))
-		return NULL;
-
-	if (likely(!sysfs_ignore_lockdep(sd)))
-		rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_);
-	return sd;
-}
-
-/**
- *	sysfs_put_active - put an active reference to sysfs_dirent
- *	@sd: sysfs_dirent to put an active reference to
- *
- *	Put an active reference to @sd.  This function is noop if @sd
- *	is NULL.
- */
-void sysfs_put_active(struct sysfs_dirent *sd)
-{
-	int v;
-
-	if (unlikely(!sd))
-		return;
-
-	if (likely(!sysfs_ignore_lockdep(sd)))
-		rwsem_release(&sd->dep_map, 1, _RET_IP_);
-	v = atomic_dec_return(&sd->s_active);
-	if (likely(v != SD_DEACTIVATED_BIAS))
-		return;
-
-	/* atomic_dec_return() is a mb(), we'll always see the updated
-	 * sd->u.completion.
-	 */
-	complete(sd->u.completion);
-}
-
-/**
- *	sysfs_deactivate - deactivate sysfs_dirent
- *	@sd: sysfs_dirent to deactivate
- *
- *	Deny new active references and drain existing ones.
- */
-static void sysfs_deactivate(struct sysfs_dirent *sd)
-{
-	DECLARE_COMPLETION_ONSTACK(wait);
-	int v;
-
-	BUG_ON(!(sd->s_flags & SYSFS_FLAG_REMOVED));
-
-	if (!(sysfs_type(sd) & SYSFS_ACTIVE_REF))
-		return;
-
-	sd->u.completion = (void *)&wait;
-
-	rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_);
-	/* atomic_add_return() is a mb(), put_active() will always see
-	 * the updated sd->u.completion.
-	 */
-	v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active);
-
-	if (v != SD_DEACTIVATED_BIAS) {
-		lock_contended(&sd->dep_map, _RET_IP_);
-		wait_for_completion(&wait);
-	}
-
-	lock_acquired(&sd->dep_map, _RET_IP_);
-	rwsem_release(&sd->dep_map, 1, _RET_IP_);
-}
-
-static int sysfs_alloc_ino(unsigned int *pino)
-{
-	int ino, rc;
-
- retry:
-	spin_lock(&sysfs_ino_lock);
-	rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino);
-	spin_unlock(&sysfs_ino_lock);
-
-	if (rc == -EAGAIN) {
-		if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL))
-			goto retry;
-		rc = -ENOMEM;
-	}
-
-	*pino = ino;
-	return rc;
-}
-
-static void sysfs_free_ino(unsigned int ino)
-{
-	spin_lock(&sysfs_ino_lock);
-	ida_remove(&sysfs_ino_ida, ino);
-	spin_unlock(&sysfs_ino_lock);
-}
-
-void release_sysfs_dirent(struct sysfs_dirent *sd)
-{
-	struct sysfs_dirent *parent_sd;
-
- repeat:
-	/* Moving/renaming is always done while holding reference.
-	 * sd->s_parent won't change beneath us.
-	 */
-	parent_sd = sd->s_parent;
-
-	WARN(!(sd->s_flags & SYSFS_FLAG_REMOVED),
-		"sysfs: free using entry: %s/%s\n",
-		parent_sd ? parent_sd->s_name : "", sd->s_name);
-
-	if (sysfs_type(sd) == SYSFS_KOBJ_LINK)
-		sysfs_put(sd->s_symlink.target_sd);
-	if (sysfs_type(sd) & SYSFS_COPY_NAME)
-		kfree(sd->s_name);
-	if (sd->s_iattr && sd->s_iattr->ia_secdata)
-		security_release_secctx(sd->s_iattr->ia_secdata,
-					sd->s_iattr->ia_secdata_len);
-	kfree(sd->s_iattr);
-	sysfs_free_ino(sd->s_ino);
-	kmem_cache_free(sysfs_dir_cachep, sd);
-
-	sd = parent_sd;
-	if (sd && atomic_dec_and_test(&sd->s_count))
-		goto repeat;
-}
-
-static int sysfs_dentry_delete(const struct dentry *dentry)
-{
-	struct sysfs_dirent *sd = dentry->d_fsdata;
-	return !(sd && !(sd->s_flags & SYSFS_FLAG_REMOVED));
-}
-
-static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
-{
-	struct sysfs_dirent *sd;
-	int type;
-
-	if (flags & LOOKUP_RCU)
-		return -ECHILD;
-
-	sd = dentry->d_fsdata;
-	mutex_lock(&sysfs_mutex);
-
-	/* The sysfs dirent has been deleted */
-	if (sd->s_flags & SYSFS_FLAG_REMOVED)
-		goto out_bad;
-
-	/* The sysfs dirent has been moved? */
-	if (dentry->d_parent->d_fsdata != sd->s_parent)
-		goto out_bad;
-
-	/* The sysfs dirent has been renamed */
-	if (strcmp(dentry->d_name.name, sd->s_name) != 0)
-		goto out_bad;
-
-	/* The sysfs dirent has been moved to a different namespace */
-	type = KOBJ_NS_TYPE_NONE;
-	if (sd->s_parent) {
-		type = sysfs_ns_type(sd->s_parent);
-		if (type != KOBJ_NS_TYPE_NONE &&
-				sysfs_info(dentry->d_sb)->ns[type] != sd->s_ns)
-			goto out_bad;
-	}
-
-	mutex_unlock(&sysfs_mutex);
-out_valid:
-	return 1;
-out_bad:
-	/* Remove the dentry from the dcache hashes.
-	 * If this is a deleted dentry we use d_drop instead of d_delete
-	 * so sysfs doesn't need to cope with negative dentries.
-	 *
-	 * If this is a dentry that has simply been renamed we
-	 * use d_drop to remove it from the dcache lookup on its
-	 * old parent.  If this dentry persists later when a lookup
-	 * is performed at its new name the dentry will be readded
-	 * to the dcache hashes.
-	 */
-	mutex_unlock(&sysfs_mutex);
-
-	/* If we have submounts we must allow the vfs caches
-	 * to lie about the state of the filesystem to prevent
-	 * leaks and other nasty things.
-	 */
-	if (check_submounts_and_drop(dentry) != 0)
-		goto out_valid;
-
-	return 0;
-}
-
-static void sysfs_dentry_release(struct dentry *dentry)
-{
-	sysfs_put(dentry->d_fsdata);
-}
-
-const struct dentry_operations sysfs_dentry_ops = {
-	.d_revalidate	= sysfs_dentry_revalidate,
-	.d_delete	= sysfs_dentry_delete,
-	.d_release	= sysfs_dentry_release,
-};
-
-struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
-{
-	char *dup_name = NULL;
-	struct sysfs_dirent *sd;
-
-	if (type & SYSFS_COPY_NAME) {
-		name = dup_name = kstrdup(name, GFP_KERNEL);
-		if (!name)
-			return NULL;
-	}
-
-	sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL);
-	if (!sd)
-		goto err_out1;
-
-	if (sysfs_alloc_ino(&sd->s_ino))
-		goto err_out2;
-
-	atomic_set(&sd->s_count, 1);
-	atomic_set(&sd->s_active, 0);
-
-	sd->s_name = name;
-	sd->s_mode = mode;
-	sd->s_flags = type | SYSFS_FLAG_REMOVED;
-
-	return sd;
-
- err_out2:
-	kmem_cache_free(sysfs_dir_cachep, sd);
- err_out1:
-	kfree(dup_name);
-	return NULL;
-}
-
-/**
- *	sysfs_addrm_start - prepare for sysfs_dirent add/remove
- *	@acxt: pointer to sysfs_addrm_cxt to be used
- *
- *	This function is called when the caller is about to add or remove
- *	sysfs_dirent.  This function acquires sysfs_mutex.  @acxt is used
- *	to keep and pass context to other addrm functions.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep).  sysfs_mutex is locked on
- *	return.
- */
-void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt)
-	__acquires(sysfs_mutex)
-{
-	memset(acxt, 0, sizeof(*acxt));
-
-	mutex_lock(&sysfs_mutex);
-}
-
-/**
- *	__sysfs_add_one - add sysfs_dirent to parent without warning
- *	@acxt: addrm context to use
- *	@sd: sysfs_dirent to be added
- *	@parent_sd: the parent sysfs_dirent to add @sd to
- *
- *	Get @parent_sd and set @sd->s_parent to it and increment nlink of
- *	the parent inode if @sd is a directory and link into the children
- *	list of the parent.
- *
- *	This function should be called between calls to
- *	sysfs_addrm_start() and sysfs_addrm_finish() and should be
- *	passed the same @acxt as passed to sysfs_addrm_start().
- *
- *	LOCKING:
- *	Determined by sysfs_addrm_start().
- *
- *	RETURNS:
- *	0 on success, -EEXIST if entry with the given name already
- *	exists.
- */
-int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
-		    struct sysfs_dirent *parent_sd)
-{
-	struct sysfs_inode_attrs *ps_iattr;
-	int ret;
-
-	if (!!sysfs_ns_type(parent_sd) != !!sd->s_ns) {
-		WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
-			sysfs_ns_type(parent_sd) ? "required" : "invalid",
-			parent_sd->s_name, sd->s_name);
-		return -EINVAL;
-	}
-
-	sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns);
-	sd->s_parent = sysfs_get(parent_sd);
-
-	ret = sysfs_link_sibling(sd);
-	if (ret)
-		return ret;
-
-	/* Update timestamps on the parent */
-	ps_iattr = parent_sd->s_iattr;
-	if (ps_iattr) {
-		struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
-		ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
-	}
-
-	/* Mark the entry added into directory tree */
-	sd->s_flags &= ~SYSFS_FLAG_REMOVED;
-
-	return 0;
-}
-
-/**
- *	sysfs_pathname - return full path to sysfs dirent
- *	@sd: sysfs_dirent whose path we want
- *	@path: caller allocated buffer of size PATH_MAX
- *
- *	Gives the name "/" to the sysfs_root entry; any path returned
- *	is relative to wherever sysfs is mounted.
- */
-static char *sysfs_pathname(struct sysfs_dirent *sd, char *path)
-{
-	if (sd->s_parent) {
-		sysfs_pathname(sd->s_parent, path);
-		strlcat(path, "/", PATH_MAX);
-	}
-	strlcat(path, sd->s_name, PATH_MAX);
-	return path;
-}
-
-void sysfs_warn_dup(struct sysfs_dirent *parent, const char *name)
-{
-	char *path;
-
-	path = kzalloc(PATH_MAX, GFP_KERNEL);
-	if (path) {
-		sysfs_pathname(parent, path);
-		strlcat(path, "/", PATH_MAX);
-		strlcat(path, name, PATH_MAX);
-	}
-
-	WARN(1, KERN_WARNING "sysfs: cannot create duplicate filename '%s'\n",
-	     path ? path : name);
-
-	kfree(path);
-}
-
-/**
- *	sysfs_add_one - add sysfs_dirent to parent
- *	@acxt: addrm context to use
- *	@sd: sysfs_dirent to be added
- *	@parent_sd: the parent sysfs_dirent to add @sd to
- *
- *	Get @parent_sd and set @sd->s_parent to it and increment nlink of
- *	the parent inode if @sd is a directory and link into the children
- *	list of the parent.
- *
- *	This function should be called between calls to
- *	sysfs_addrm_start() and sysfs_addrm_finish() and should be
- *	passed the same @acxt as passed to sysfs_addrm_start().
- *
- *	LOCKING:
- *	Determined by sysfs_addrm_start().
- *
- *	RETURNS:
- *	0 on success, -EEXIST if entry with the given name already
- *	exists.
- */
-int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
-		  struct sysfs_dirent *parent_sd)
-{
-	int ret;
-
-	ret = __sysfs_add_one(acxt, sd, parent_sd);
-
-	if (ret == -EEXIST)
-		sysfs_warn_dup(parent_sd, sd->s_name);
-	return ret;
-}
-
-/**
- *	sysfs_remove_one - remove sysfs_dirent from parent
- *	@acxt: addrm context to use
- *	@sd: sysfs_dirent to be removed
- *
- *	Mark @sd removed and drop nlink of parent inode if @sd is a
- *	directory.  @sd is unlinked from the children list.
- *
- *	This function should be called between calls to
- *	sysfs_addrm_start() and sysfs_addrm_finish() and should be
- *	passed the same @acxt as passed to sysfs_addrm_start().
- *
- *	LOCKING:
- *	Determined by sysfs_addrm_start().
- */
-static void sysfs_remove_one(struct sysfs_addrm_cxt *acxt,
-			     struct sysfs_dirent *sd)
-{
-	struct sysfs_inode_attrs *ps_iattr;
-
-	/*
-	 * Removal can be called multiple times on the same node.  Only the
-	 * first invocation is effective and puts the base ref.
-	 */
-	if (sd->s_flags & SYSFS_FLAG_REMOVED)
-		return;
-
-	sysfs_unlink_sibling(sd);
-
-	/* Update timestamps on the parent */
-	ps_iattr = sd->s_parent->s_iattr;
-	if (ps_iattr) {
-		struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
-		ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
-	}
-
-	sd->s_flags |= SYSFS_FLAG_REMOVED;
-	sd->u.removed_list = acxt->removed;
-	acxt->removed = sd;
-}
-
-/**
- *	sysfs_addrm_finish - finish up sysfs_dirent add/remove
- *	@acxt: addrm context to finish up
- *
- *	Finish up sysfs_dirent add/remove.  Resources acquired by
- *	sysfs_addrm_start() are released and removed sysfs_dirents are
- *	cleaned up.
- *
- *	LOCKING:
- *	sysfs_mutex is released.
- */
-void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
-	__releases(sysfs_mutex)
-{
-	/* release resources acquired by sysfs_addrm_start() */
-	mutex_unlock(&sysfs_mutex);
-
-	/* kill removed sysfs_dirents */
-	while (acxt->removed) {
-		struct sysfs_dirent *sd = acxt->removed;
-
-		acxt->removed = sd->u.removed_list;
-
-		sysfs_deactivate(sd);
-		sysfs_unmap_bin_file(sd);
-		sysfs_put(sd);
-	}
-}
-
-/**
- *	sysfs_find_dirent - find sysfs_dirent with the given name
- *	@parent_sd: sysfs_dirent to search under
- *	@name: name to look for
- *	@ns: the namespace tag to use
- *
- *	Look for sysfs_dirent with name @name under @parent_sd.
- *
- *	LOCKING:
- *	mutex_lock(sysfs_mutex)
- *
- *	RETURNS:
- *	Pointer to sysfs_dirent if found, NULL if not.
- */
-struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
-				       const unsigned char *name,
-				       const void *ns)
+void sysfs_warn_dup(struct kernfs_node *parent, const char *name)
 {
-	struct rb_node *node = parent_sd->s_dir.children.rb_node;
-	unsigned int hash;
+	char *buf, *path = NULL;
 
-	if (!!sysfs_ns_type(parent_sd) != !!ns) {
-		WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
-			sysfs_ns_type(parent_sd) ? "required" : "invalid",
-			parent_sd->s_name, name);
-		return NULL;
-	}
+	buf = kzalloc(PATH_MAX, GFP_KERNEL);
+	if (buf)
+		path = kernfs_path(parent, buf, PATH_MAX);
 
-	hash = sysfs_name_hash(name, ns);
-	while (node) {
-		struct sysfs_dirent *sd;
-		int result;
+	WARN(1, KERN_WARNING "sysfs: cannot create duplicate filename '%s/%s'\n",
+	     path, name);
 
-		sd = to_sysfs_dirent(node);
-		result = sysfs_name_compare(hash, name, ns, sd);
-		if (result < 0)
-			node = node->rb_left;
-		else if (result > 0)
-			node = node->rb_right;
-		else
-			return sd;
-	}
-	return NULL;
-}
-
-/**
- *	sysfs_get_dirent_ns - find and get sysfs_dirent with the given name
- *	@parent_sd: sysfs_dirent to search under
- *	@name: name to look for
- *	@ns: the namespace tag to use
- *
- *	Look for sysfs_dirent with name @name under @parent_sd and get
- *	it if found.
- *
- *	LOCKING:
- *	Kernel thread context (may sleep).  Grabs sysfs_mutex.
- *
- *	RETURNS:
- *	Pointer to sysfs_dirent if found, NULL if not.
- */
-struct sysfs_dirent *sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd,
-					 const unsigned char *name,
-					 const void *ns)
-{
-	struct sysfs_dirent *sd;
-
-	mutex_lock(&sysfs_mutex);
-	sd = sysfs_find_dirent(parent_sd, name, ns);
-	sysfs_get(sd);
-	mutex_unlock(&sysfs_mutex);
-
-	return sd;
-}
-EXPORT_SYMBOL_GPL(sysfs_get_dirent_ns);
-
-static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
-		      enum kobj_ns_type type,
-		      const char *name, const void *ns,
-		      struct sysfs_dirent **p_sd)
-{
-	umode_t mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
-	struct sysfs_addrm_cxt acxt;
-	struct sysfs_dirent *sd;
-	int rc;
-
-	/* allocate */
-	sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
-	if (!sd)
-		return -ENOMEM;
-
-	sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT);
-	sd->s_ns = ns;
-	sd->s_dir.kobj = kobj;
-
-	/* link in */
-	sysfs_addrm_start(&acxt);
-	rc = sysfs_add_one(&acxt, sd, parent_sd);
-	sysfs_addrm_finish(&acxt);
-
-	if (rc == 0)
-		*p_sd = sd;
-	else
-		sysfs_put(sd);
-
-	return rc;
-}
-
-int sysfs_create_subdir(struct kobject *kobj, const char *name,
-			struct sysfs_dirent **p_sd)
-{
-	return create_dir(kobj, kobj->sd,
-			  KOBJ_NS_TYPE_NONE, name, NULL, p_sd);
-}
-
-/**
- *	sysfs_read_ns_type: return associated ns_type
- *	@kobj: the kobject being queried
- *
- *	Each kobject can be tagged with exactly one namespace type
- *	(i.e. network or user).  Return the ns_type associated with
- *	this object if any
- */
-static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj)
-{
-	const struct kobj_ns_type_operations *ops;
-	enum kobj_ns_type type;
-
-	ops = kobj_child_ns_ops(kobj);
-	if (!ops)
-		return KOBJ_NS_TYPE_NONE;
-
-	type = ops->type;
-	BUG_ON(type <= KOBJ_NS_TYPE_NONE);
-	BUG_ON(type >= KOBJ_NS_TYPES);
-	BUG_ON(!kobj_ns_type_registered(type));
-
-	return type;
+	kfree(buf);
 }
 
 /**
@@ -737,197 +40,28 @@ static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj)
  */
 int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
 {
-	enum kobj_ns_type type;
-	struct sysfs_dirent *parent_sd, *sd;
-	int error = 0;
+	struct kernfs_node *parent, *kn;
 
 	BUG_ON(!kobj);
 
 	if (kobj->parent)
-		parent_sd = kobj->parent->sd;
+		parent = kobj->parent->sd;
 	else
-		parent_sd = &sysfs_root;
+		parent = sysfs_root_kn;
 
-	if (!parent_sd)
+	if (!parent)
 		return -ENOENT;
 
-	type = sysfs_read_ns_type(kobj);
-
-	error = create_dir(kobj, parent_sd, type, kobject_name(kobj), ns, &sd);
-	if (!error)
-		kobj->sd = sd;
-	return error;
-}
-
-static struct dentry *sysfs_lookup(struct inode *dir, struct dentry *dentry,
-				   unsigned int flags)
-{
-	struct dentry *ret = NULL;
-	struct dentry *parent = dentry->d_parent;
-	struct sysfs_dirent *parent_sd = parent->d_fsdata;
-	struct sysfs_dirent *sd;
-	struct inode *inode;
-	enum kobj_ns_type type;
-	const void *ns;
-
-	mutex_lock(&sysfs_mutex);
-
-	type = sysfs_ns_type(parent_sd);
-	ns = sysfs_info(dir->i_sb)->ns[type];
-
-	sd = sysfs_find_dirent(parent_sd, dentry->d_name.name, ns);
-
-	/* no such entry */
-	if (!sd) {
-		ret = ERR_PTR(-ENOENT);
-		goto out_unlock;
-	}
-	dentry->d_fsdata = sysfs_get(sd);
-
-	/* attach dentry and inode */
-	inode = sysfs_get_inode(dir->i_sb, sd);
-	if (!inode) {
-		ret = ERR_PTR(-ENOMEM);
-		goto out_unlock;
-	}
-
-	/* instantiate and hash dentry */
-	ret = d_materialise_unique(dentry, inode);
- out_unlock:
-	mutex_unlock(&sysfs_mutex);
-	return ret;
-}
-
-const struct inode_operations sysfs_dir_inode_operations = {
-	.lookup		= sysfs_lookup,
-	.permission	= sysfs_permission,
-	.setattr	= sysfs_setattr,
-	.getattr	= sysfs_getattr,
-	.setxattr	= sysfs_setxattr,
-};
-
-static struct sysfs_dirent *sysfs_leftmost_descendant(struct sysfs_dirent *pos)
-{
-	struct sysfs_dirent *last;
-
-	while (true) {
-		struct rb_node *rbn;
-
-		last = pos;
-
-		if (sysfs_type(pos) != SYSFS_DIR)
-			break;
-
-		rbn = rb_first(&pos->s_dir.children);
-		if (!rbn)
-			break;
-
-		pos = to_sysfs_dirent(rbn);
+	kn = kernfs_create_dir_ns(parent, kobject_name(kobj),
+				  S_IRWXU | S_IRUGO | S_IXUGO, kobj, ns);
+	if (IS_ERR(kn)) {
+		if (PTR_ERR(kn) == -EEXIST)
+			sysfs_warn_dup(parent, kobject_name(kobj));
+		return PTR_ERR(kn);
 	}
 
-	return last;
-}
-
-/**
- * sysfs_next_descendant_post - find the next descendant for post-order walk
- * @pos: the current position (%NULL to initiate traversal)
- * @root: sysfs_dirent whose descendants to walk
- *
- * Find the next descendant to visit for post-order traversal of @root's
- * descendants.  @root is included in the iteration and the last node to be
- * visited.
- */
-static struct sysfs_dirent *sysfs_next_descendant_post(struct sysfs_dirent *pos,
-						       struct sysfs_dirent *root)
-{
-	struct rb_node *rbn;
-
-	lockdep_assert_held(&sysfs_mutex);
-
-	/* if first iteration, visit leftmost descendant which may be root */
-	if (!pos)
-		return sysfs_leftmost_descendant(root);
-
-	/* if we visited @root, we're done */
-	if (pos == root)
-		return NULL;
-
-	/* if there's an unvisited sibling, visit its leftmost descendant */
-	rbn = rb_next(&pos->s_rb);
-	if (rbn)
-		return sysfs_leftmost_descendant(to_sysfs_dirent(rbn));
-
-	/* no sibling left, visit parent */
-	return pos->s_parent;
-}
-
-static void __sysfs_remove(struct sysfs_addrm_cxt *acxt,
-			   struct sysfs_dirent *sd)
-{
-	struct sysfs_dirent *pos, *next;
-
-	if (!sd)
-		return;
-
-	pr_debug("sysfs %s: removing\n", sd->s_name);
-
-	next = NULL;
-	do {
-		pos = next;
-		next = sysfs_next_descendant_post(pos, sd);
-		if (pos)
-			sysfs_remove_one(acxt, pos);
-	} while (next);
-}
-
-/**
- * sysfs_remove - remove a sysfs_dirent recursively
- * @sd: the sysfs_dirent to remove
- *
- * Remove @sd along with all its subdirectories and files.
- */
-void sysfs_remove(struct sysfs_dirent *sd)
-{
-	struct sysfs_addrm_cxt acxt;
-
-	sysfs_addrm_start(&acxt);
-	__sysfs_remove(&acxt, sd);
-	sysfs_addrm_finish(&acxt);
-}
-
-/**
- * sysfs_hash_and_remove - find a sysfs_dirent by name and remove it
- * @dir_sd: parent of the target
- * @name: name of the sysfs_dirent to remove
- * @ns: namespace tag of the sysfs_dirent to remove
- *
- * Look for the sysfs_dirent with @name and @ns under @dir_sd and remove
- * it.  Returns 0 on success, -ENOENT if such entry doesn't exist.
- */
-int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name,
-			  const void *ns)
-{
-	struct sysfs_addrm_cxt acxt;
-	struct sysfs_dirent *sd;
-
-	if (!dir_sd) {
-		WARN(1, KERN_WARNING "sysfs: can not remove '%s', no directory\n",
-			name);
-		return -ENOENT;
-	}
-
-	sysfs_addrm_start(&acxt);
-
-	sd = sysfs_find_dirent(dir_sd, name, ns);
-	if (sd)
-		__sysfs_remove(&acxt, sd);
-
-	sysfs_addrm_finish(&acxt);
-
-	if (sd)
-		return 0;
-	else
-		return -ENOENT;
+	kobj->sd = kn;
+	return 0;
 }
 
 /**
@@ -940,207 +74,50 @@ int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name,
  */
 void sysfs_remove_dir(struct kobject *kobj)
 {
-	struct sysfs_dirent *sd = kobj->sd;
+	struct kernfs_node *kn = kobj->sd;
 
 	/*
 	 * In general, kboject owner is responsible for ensuring removal
 	 * doesn't race with other operations and sysfs doesn't provide any
 	 * protection; however, when @kobj is used as a symlink target, the
 	 * symlinking entity usually doesn't own @kobj and thus has no
-	 * control over removal.  @kobj->sd may be removed anytime and
-	 * symlink code may end up dereferencing an already freed sd.
+	 * control over removal.  @kobj->sd may be removed anytime
+	 * and symlink code may end up dereferencing an already freed node.
 	 *
-	 * sysfs_symlink_target_lock synchronizes @kobj->sd disassociation
-	 * against symlink operations so that symlink code can safely
-	 * dereference @kobj->sd.
+	 * sysfs_symlink_target_lock synchronizes @kobj->sd
+	 * disassociation against symlink operations so that symlink code
+	 * can safely dereference @kobj->sd.
 	 */
 	spin_lock(&sysfs_symlink_target_lock);
 	kobj->sd = NULL;
 	spin_unlock(&sysfs_symlink_target_lock);
 
-	if (sd) {
-		WARN_ON_ONCE(sysfs_type(sd) != SYSFS_DIR);
-		sysfs_remove(sd);
+	if (kn) {
+		WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR);
+		kernfs_remove(kn);
 	}
 }
 
-int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
-		 const char *new_name, const void *new_ns)
-{
-	int error;
-
-	mutex_lock(&sysfs_mutex);
-
-	error = 0;
-	if ((sd->s_parent == new_parent_sd) && (sd->s_ns == new_ns) &&
-	    (strcmp(sd->s_name, new_name) == 0))
-		goto out;	/* nothing to rename */
-
-	error = -EEXIST;
-	if (sysfs_find_dirent(new_parent_sd, new_name, new_ns))
-		goto out;
-
-	/* rename sysfs_dirent */
-	if (strcmp(sd->s_name, new_name) != 0) {
-		error = -ENOMEM;
-		new_name = kstrdup(new_name, GFP_KERNEL);
-		if (!new_name)
-			goto out;
-
-		kfree(sd->s_name);
-		sd->s_name = new_name;
-	}
-
-	/*
-	 * Move to the appropriate place in the appropriate directories rbtree.
-	 */
-	sysfs_unlink_sibling(sd);
-	sysfs_get(new_parent_sd);
-	sysfs_put(sd->s_parent);
-	sd->s_ns = new_ns;
-	sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns);
-	sd->s_parent = new_parent_sd;
-	sysfs_link_sibling(sd);
-
-	error = 0;
- out:
-	mutex_unlock(&sysfs_mutex);
-	return error;
-}
-
 int sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
 			const void *new_ns)
 {
-	struct sysfs_dirent *parent_sd = kobj->sd->s_parent;
+	struct kernfs_node *parent;
+	int ret;
 
-	return sysfs_rename(kobj->sd, parent_sd, new_name, new_ns);
+	parent = kernfs_get_parent(kobj->sd);
+	ret = kernfs_rename_ns(kobj->sd, parent, new_name, new_ns);
+	kernfs_put(parent);
+	return ret;
 }
 
 int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
 		      const void *new_ns)
 {
-	struct sysfs_dirent *sd = kobj->sd;
-	struct sysfs_dirent *new_parent_sd;
+	struct kernfs_node *kn = kobj->sd;
+	struct kernfs_node *new_parent;
 
-	BUG_ON(!sd->s_parent);
-	new_parent_sd = new_parent_kobj && new_parent_kobj->sd ?
-		new_parent_kobj->sd : &sysfs_root;
+	new_parent = new_parent_kobj && new_parent_kobj->sd ?
+		new_parent_kobj->sd : sysfs_root_kn;
 
-	return sysfs_rename(sd, new_parent_sd, sd->s_name, new_ns);
+	return kernfs_rename_ns(kn, new_parent, kn->name, new_ns);
 }
-
-/* Relationship between s_mode and the DT_xxx types */
-static inline unsigned char dt_type(struct sysfs_dirent *sd)
-{
-	return (sd->s_mode >> 12) & 15;
-}
-
-static int sysfs_dir_release(struct inode *inode, struct file *filp)
-{
-	sysfs_put(filp->private_data);
-	return 0;
-}
-
-static struct sysfs_dirent *sysfs_dir_pos(const void *ns,
-	struct sysfs_dirent *parent_sd,	loff_t hash, struct sysfs_dirent *pos)
-{
-	if (pos) {
-		int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) &&
-			pos->s_parent == parent_sd &&
-			hash == pos->s_hash;
-		sysfs_put(pos);
-		if (!valid)
-			pos = NULL;
-	}
-	if (!pos && (hash > 1) && (hash < INT_MAX)) {
-		struct rb_node *node = parent_sd->s_dir.children.rb_node;
-		while (node) {
-			pos = to_sysfs_dirent(node);
-
-			if (hash < pos->s_hash)
-				node = node->rb_left;
-			else if (hash > pos->s_hash)
-				node = node->rb_right;
-			else
-				break;
-		}
-	}
-	/* Skip over entries in the wrong namespace */
-	while (pos && pos->s_ns != ns) {
-		struct rb_node *node = rb_next(&pos->s_rb);
-		if (!node)
-			pos = NULL;
-		else
-			pos = to_sysfs_dirent(node);
-	}
-	return pos;
-}
-
-static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns,
-	struct sysfs_dirent *parent_sd,	ino_t ino, struct sysfs_dirent *pos)
-{
-	pos = sysfs_dir_pos(ns, parent_sd, ino, pos);
-	if (pos)
-		do {
-			struct rb_node *node = rb_next(&pos->s_rb);
-			if (!node)
-				pos = NULL;
-			else
-				pos = to_sysfs_dirent(node);
-		} while (pos && pos->s_ns != ns);
-	return pos;
-}
-
-static int sysfs_readdir(struct file *file, struct dir_context *ctx)
-{
-	struct dentry *dentry = file->f_path.dentry;
-	struct sysfs_dirent *parent_sd = dentry->d_fsdata;
-	struct sysfs_dirent *pos = file->private_data;
-	enum kobj_ns_type type;
-	const void *ns;
-
-	type = sysfs_ns_type(parent_sd);
-	ns = sysfs_info(dentry->d_sb)->ns[type];
-
-	if (!dir_emit_dots(file, ctx))
-		return 0;
-	mutex_lock(&sysfs_mutex);
-	for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos);
-	     pos;
-	     pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) {
-		const char *name = pos->s_name;
-		unsigned int type = dt_type(pos);
-		int len = strlen(name);
-		ino_t ino = pos->s_ino;
-		ctx->pos = pos->s_hash;
-		file->private_data = sysfs_get(pos);
-
-		mutex_unlock(&sysfs_mutex);
-		if (!dir_emit(ctx, name, len, ino, type))
-			return 0;
-		mutex_lock(&sysfs_mutex);
-	}
-	mutex_unlock(&sysfs_mutex);
-	file->private_data = NULL;
-	ctx->pos = INT_MAX;
-	return 0;
-}
-
-static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence)
-{
-	struct inode *inode = file_inode(file);
-	loff_t ret;
-
-	mutex_lock(&inode->i_mutex);
-	ret = generic_file_llseek(file, offset, whence);
-	mutex_unlock(&inode->i_mutex);
-
-	return ret;
-}
-
-const struct file_operations sysfs_dir_operations = {
-	.read		= generic_read_dir,
-	.iterate	= sysfs_readdir,
-	.release	= sysfs_dir_release,
-	.llseek		= sysfs_dir_llseek,
-};