[deliverable/linux.git] / fs / sysfs / inode.c

/*
 * fs/sysfs/inode.c - basic sysfs inode and dentry operations
 *
 * Copyright (c) 2001-3 Patrick Mochel
 * Copyright (c) 2007 SUSE Linux Products GmbH
 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
 *
 * This file is released under the GPLv2.
 *
 * Please see Documentation/filesystems/sysfs.txt for more information.
 */

#undef DEBUG 

#include <linux/pagemap.h>
#include <linux/namei.h>
#include <linux/backing-dev.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/xattr.h>
#include <linux/security.h>
#include "sysfs.h"

extern struct super_block * sysfs_sb;

static const struct address_space_operations sysfs_aops = {
	.readpage	= simple_readpage,
	.write_begin	= simple_write_begin,
	.write_end	= simple_write_end,
};

static struct backing_dev_info sysfs_backing_dev_info = {
	.name		= "sysfs",
	.ra_pages	= 0,	/* No readahead */
	.capabilities	= BDI_CAP_NO_ACCT_AND_WRITEBACK,
};

static const struct inode_operations sysfs_inode_operations ={
	.setattr	= sysfs_setattr,
	.setxattr	= sysfs_setxattr,
};

int __init sysfs_inode_init(void)
{
	return bdi_init(&sysfs_backing_dev_info);
}

static struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd)
{
	struct sysfs_inode_attrs *attrs;
	struct iattr *iattrs;

	attrs = kzalloc(sizeof(struct sysfs_inode_attrs), GFP_KERNEL);
	if (!attrs)
		return NULL;
	iattrs = &attrs->ia_iattr;

	/* assign default attributes */
	iattrs->ia_mode = sd->s_mode;
	iattrs->ia_uid = 0;
	iattrs->ia_gid = 0;
	iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;

	return attrs;
}

int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr * iattr)
{
	struct sysfs_inode_attrs *sd_attrs;
	struct iattr *iattrs;
	unsigned int ia_valid = iattr->ia_valid;

	sd_attrs = sd->s_iattr;

	if (!sd_attrs) {
		/* setting attributes for the first time, allocate now */
		sd_attrs = sysfs_init_inode_attrs(sd);
		if (!sd_attrs)
			return -ENOMEM;
		sd->s_iattr = sd_attrs;
	} else {
		/* attributes were changed at least once in past */
		iattrs = &sd_attrs->ia_iattr;

		if (ia_valid & ATTR_UID)
			iattrs->ia_uid = iattr->ia_uid;
		if (ia_valid & ATTR_GID)
			iattrs->ia_gid = iattr->ia_gid;
		if (ia_valid & ATTR_ATIME)
			iattrs->ia_atime = iattr->ia_atime;
		if (ia_valid & ATTR_MTIME)
			iattrs->ia_mtime = iattr->ia_mtime;
		if (ia_valid & ATTR_CTIME)
			iattrs->ia_ctime = iattr->ia_ctime;
		if (ia_valid & ATTR_MODE) {
			umode_t mode = iattr->ia_mode;
			iattrs->ia_mode = sd->s_mode = mode;
		}
	}
	return 0;
}

int sysfs_setattr(struct dentry *dentry, struct iattr *iattr)
{
	struct inode *inode = dentry->d_inode;
	struct sysfs_dirent *sd = dentry->d_fsdata;
	int error;

	if (!sd)
		return -EINVAL;

	error = inode_change_ok(inode, iattr);
	if (error)
		return error;

	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
	if (iattr->ia_valid & ATTR_MODE) {
		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
			iattr->ia_mode &= ~S_ISGID;
	}

	error = inode_setattr(inode, iattr);
	if (error)
		return error;

	mutex_lock(&sysfs_mutex);
	error = sysfs_sd_setattr(sd, iattr);
	mutex_unlock(&sysfs_mutex);

	return error;
}

static int sysfs_sd_setsecdata(struct sysfs_dirent *sd, void **secdata, u32 *secdata_len)
{
	struct sysfs_inode_attrs *iattrs;
	void *old_secdata;
	size_t old_secdata_len;

	iattrs = sd->s_iattr;
	if (!iattrs)
		iattrs = sysfs_init_inode_attrs(sd);
	if (!iattrs)
		return -ENOMEM;

	old_secdata = iattrs->ia_secdata;
	old_secdata_len = iattrs->ia_secdata_len;

	iattrs->ia_secdata = *secdata;
	iattrs->ia_secdata_len = *secdata_len;

	*secdata = old_secdata;
	*secdata_len = old_secdata_len;
	return 0;
}

int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
		size_t size, int flags)
{
	struct sysfs_dirent *sd = dentry->d_fsdata;
	void *secdata;
	int error;
	u32 secdata_len = 0;

	if (!sd)
		return -EINVAL;

	if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
		const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
		error = security_inode_setsecurity(dentry->d_inode, suffix,
						value, size, flags);
		if (error)
			goto out;
		error = security_inode_getsecctx(dentry->d_inode,
						&secdata, &secdata_len);
		if (error)
			goto out;

		mutex_lock(&sysfs_mutex);
		error = sysfs_sd_setsecdata(sd, &secdata, &secdata_len);
		mutex_unlock(&sysfs_mutex);

		if (secdata)
			security_release_secctx(secdata, secdata_len);
	} else
		return -EINVAL;
out:
	return error;
}

static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
{
	inode->i_mode = mode;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
}

static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
{
	inode->i_mode = iattr->ia_mode;
	inode->i_uid = iattr->ia_uid;
	inode->i_gid = iattr->ia_gid;
	inode->i_atime = iattr->ia_atime;
	inode->i_mtime = iattr->ia_mtime;
	inode->i_ctime = iattr->ia_ctime;
}


/*
 * sysfs has a different i_mutex lock order behavior for i_mutex than other
 * filesystems; sysfs i_mutex is called in many places with subsystem locks
 * held. At the same time, many of the VFS locking rules do not apply to
 * sysfs at all (cross directory rename for example). To untangle this mess
 * (which gives false positives in lockdep), we're giving sysfs inodes their
 * own class for i_mutex.
 */
static struct lock_class_key sysfs_inode_imutex_key;

static int sysfs_count_nlink(struct sysfs_dirent *sd)
{
	struct sysfs_dirent *child;
	int nr = 0;

	for (child = sd->s_dir.children; child; child = child->s_sibling)
		if (sysfs_type(child) == SYSFS_DIR)
			nr++;

	return nr + 2;
}

static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
{
	struct bin_attribute *bin_attr;
	struct sysfs_inode_attrs *iattrs;

	inode->i_private = sysfs_get(sd);
	inode->i_mapping->a_ops = &sysfs_aops;
	inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
	inode->i_op = &sysfs_inode_operations;
	inode->i_ino = sd->s_ino;
	lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);

	iattrs = sd->s_iattr;
	if (iattrs) {
		/* sysfs_dirent has non-default attributes
		 * get them for the new inode from persistent copy
		 * in sysfs_dirent
		 */
		set_inode_attr(inode, &iattrs->ia_iattr);
		if (iattrs->ia_secdata)
			security_inode_notifysecctx(inode,
						iattrs->ia_secdata,
						iattrs->ia_secdata_len);
	} else
		set_default_inode_attr(inode, sd->s_mode);

	/* initialize inode according to type */
	switch (sysfs_type(sd)) {
	case SYSFS_DIR:
		inode->i_op = &sysfs_dir_inode_operations;
		inode->i_fop = &sysfs_dir_operations;
		inode->i_nlink = sysfs_count_nlink(sd);
		break;
	case SYSFS_KOBJ_ATTR:
		inode->i_size = PAGE_SIZE;
		inode->i_fop = &sysfs_file_operations;
		break;
	case SYSFS_KOBJ_BIN_ATTR:
		bin_attr = sd->s_bin_attr.bin_attr;
		inode->i_size = bin_attr->size;
		inode->i_fop = &bin_fops;
		break;
	case SYSFS_KOBJ_LINK:
		inode->i_op = &sysfs_symlink_inode_operations;
		break;
	default:
		BUG();
	}

	unlock_new_inode(inode);
}

/**
 *	sysfs_get_inode - get inode for sysfs_dirent
 *	@sd: sysfs_dirent to allocate inode for
 *
 *	Get inode for @sd.  If such inode doesn't exist, a new inode
 *	is allocated and basics are initialized.  New inode is
 *	returned locked.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Pointer to allocated inode on success, NULL on failure.
 */
struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
{
	struct inode *inode;

	inode = iget_locked(sysfs_sb, sd->s_ino);
	if (inode && (inode->i_state & I_NEW))
		sysfs_init_inode(sd, inode);

	return inode;
}

/*
 * The sysfs_dirent serves as both an inode and a directory entry for sysfs.
 * To prevent the sysfs inode numbers from being freed prematurely we take a
 * reference to sysfs_dirent from the sysfs inode.  A
 * super_operations.delete_inode() implementation is needed to drop that
 * reference upon inode destruction.
 */
void sysfs_delete_inode(struct inode *inode)
{
	struct sysfs_dirent *sd  = inode->i_private;

	truncate_inode_pages(&inode->i_data, 0);
	clear_inode(inode);
	sysfs_put(sd);
}

int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
{
	struct sysfs_addrm_cxt acxt;
	struct sysfs_dirent *sd;

	if (!dir_sd)
		return -ENOENT;

	sysfs_addrm_start(&acxt, dir_sd);

	sd = sysfs_find_dirent(dir_sd, name);
	if (sd)
		sysfs_remove_one(&acxt, sd);

	sysfs_addrm_finish(&acxt);

	if (sd)
		return 0;
	else
		return -ENOENT;
}
Commit	Line	Data
1da177e4	1	/*
6d66f5cd	2	* fs/sysfs/inode.c - basic sysfs inode and dentry operations
1da177e4	3	*
6d66f5cd TH	4	* Copyright (c) 2001-3 Patrick Mochel
	5	* Copyright (c) 2007 SUSE Linux Products GmbH
	6	* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
	7	*
	8	* This file is released under the GPLv2.
1da177e4 LT	9	*
	10	* Please see Documentation/filesystems/sysfs.txt for more information.
	11	*/
	12
	13	#undef DEBUG
	14
	15	#include <linux/pagemap.h>
	16	#include <linux/namei.h>
	17	#include <linux/backing-dev.h>
16f7e0fe	18	#include <linux/capability.h>
995982ca	19	#include <linux/errno.h>
e8edc6e0	20	#include <linux/sched.h>
ddd29ec6 DQ	21	#include <linux/xattr.h>
ddd29ec6 DQ	22	#include <linux/security.h>
1da177e4 LT	23	#include "sysfs.h"
	24
	25	extern struct super_block * sysfs_sb;
	26
f5e54d6e	27	static const struct address_space_operations sysfs_aops = {
1da177e4	28	.readpage = simple_readpage,
800d15a5 NP	29	.write_begin = simple_write_begin,
800d15a5 NP	30	.write_end = simple_write_end,
1da177e4 LT	31	};
	32
	33	static struct backing_dev_info sysfs_backing_dev_info = {
d993831f	34	.name = "sysfs",
1da177e4	35	.ra_pages = 0, /* No readahead */
e4ad08fe	36	.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
1da177e4 LT	37	};
1da177e4 LT	38
c5ef1c42	39	static const struct inode_operations sysfs_inode_operations ={
988d186d	40	.setattr = sysfs_setattr,
ddd29ec6	41	.setxattr = sysfs_setxattr,
988d186d MS	42	};
988d186d MS	43
e0bf68dd PZ	44	int __init sysfs_inode_init(void)
	45	{
	46	return bdi_init(&sysfs_backing_dev_info);
	47	}
	48
f38506c4	49	static struct sysfs_inode_attrs sysfs_init_inode_attrs(struct sysfs_dirent sd)
ddd29ec6 DQ	50	{
	51	struct sysfs_inode_attrs *attrs;
	52	struct iattr *iattrs;
	53
	54	attrs = kzalloc(sizeof(struct sysfs_inode_attrs), GFP_KERNEL);
	55	if (!attrs)
	56	return NULL;
	57	iattrs = &attrs->ia_iattr;
	58
	59	/* assign default attributes */
	60	iattrs->ia_mode = sd->s_mode;
	61	iattrs->ia_uid = 0;
	62	iattrs->ia_gid = 0;
	63	iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;
	64
	65	return attrs;
	66	}
f38506c4	67
35df63c4	68	int sysfs_sd_setattr(struct sysfs_dirent sd, struct iattr iattr)
988d186d	69	{
ddd29ec6 DQ	70	struct sysfs_inode_attrs *sd_attrs;
ddd29ec6 DQ	71	struct iattr *iattrs;
988d186d	72	unsigned int ia_valid = iattr->ia_valid;
988d186d	73
ddd29ec6	74	sd_attrs = sd->s_iattr;
988d186d	75
ddd29ec6	76	if (!sd_attrs) {
988d186d	77	/* setting attributes for the first time, allocate now */
ddd29ec6 DQ	78	sd_attrs = sysfs_init_inode_attrs(sd);
ddd29ec6 DQ	79	if (!sd_attrs)
988d186d	80	return -ENOMEM;
ddd29ec6 DQ	81	sd->s_iattr = sd_attrs;
	82	} else {
	83	/* attributes were changed at least once in past */
	84	iattrs = &sd_attrs->ia_iattr;
	85
	86	if (ia_valid & ATTR_UID)
	87	iattrs->ia_uid = iattr->ia_uid;
	88	if (ia_valid & ATTR_GID)
	89	iattrs->ia_gid = iattr->ia_gid;
	90	if (ia_valid & ATTR_ATIME)
4be3df28	91	iattrs->ia_atime = iattr->ia_atime;
ddd29ec6	92	if (ia_valid & ATTR_MTIME)
4be3df28	93	iattrs->ia_mtime = iattr->ia_mtime;
ddd29ec6	94	if (ia_valid & ATTR_CTIME)
4be3df28	95	iattrs->ia_ctime = iattr->ia_ctime;
ddd29ec6 DQ	96	if (ia_valid & ATTR_MODE) {
ddd29ec6 DQ	97	umode_t mode = iattr->ia_mode;
ddd29ec6 DQ	98	iattrs->ia_mode = sd->s_mode = mode;
ddd29ec6 DQ	99	}
988d186d	100	}
35df63c4 EB	101	return 0;
	102	}
	103
	104	int sysfs_setattr(struct dentry dentry, struct iattr iattr)
	105	{
	106	struct inode *inode = dentry->d_inode;
	107	struct sysfs_dirent *sd = dentry->d_fsdata;
	108	int error;
	109
	110	if (!sd)
	111	return -EINVAL;
	112
	113	error = inode_change_ok(inode, iattr);
	114	if (error)
	115	return error;
	116
	117	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
	118	if (iattr->ia_valid & ATTR_MODE) {
	119	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	120	iattr->ia_mode &= ~S_ISGID;
	121	}
	122
	123	error = inode_setattr(inode, iattr);
	124	if (error)
	125	return error;
	126
	127	mutex_lock(&sysfs_mutex);
	128	error = sysfs_sd_setattr(sd, iattr);
	129	mutex_unlock(&sysfs_mutex);
	130
ddd29ec6 DQ	131	return error;
ddd29ec6 DQ	132	}
988d186d	133
f44d3e78 EB	134	static int sysfs_sd_setsecdata(struct sysfs_dirent sd, void secdata, u32 secdata_len)
	135	{
	136	struct sysfs_inode_attrs *iattrs;
	137	void *old_secdata;
	138	size_t old_secdata_len;
	139
	140	iattrs = sd->s_iattr;
	141	if (!iattrs)
	142	iattrs = sysfs_init_inode_attrs(sd);
	143	if (!iattrs)
	144	return -ENOMEM;
	145
	146	old_secdata = iattrs->ia_secdata;
	147	old_secdata_len = iattrs->ia_secdata_len;
	148
	149	iattrs->ia_secdata = *secdata;
	150	iattrs->ia_secdata_len = *secdata_len;
	151
	152	*secdata = old_secdata;
	153	*secdata_len = old_secdata_len;
	154	return 0;
	155	}
	156
ddd29ec6 DQ	157	int sysfs_setxattr(struct dentry dentry, const char name, const void *value,
	158	size_t size, int flags)
	159	{
	160	struct sysfs_dirent *sd = dentry->d_fsdata;
ddd29ec6 DQ	161	void *secdata;
	162	int error;
	163	u32 secdata_len = 0;
	164
	165	if (!sd)
	166	return -EINVAL;
ddd29ec6 DQ	167
	168	if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
	169	const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
	170	error = security_inode_setsecurity(dentry->d_inode, suffix,
	171	value, size, flags);
	172	if (error)
	173	goto out;
	174	error = security_inode_getsecctx(dentry->d_inode,
	175	&secdata, &secdata_len);
	176	if (error)
	177	goto out;
988d186d	178
f44d3e78 EB	179	mutex_lock(&sysfs_mutex);
	180	error = sysfs_sd_setsecdata(sd, &secdata, &secdata_len);
	181	mutex_unlock(&sysfs_mutex);
	182
	183	if (secdata)
	184	security_release_secctx(secdata, secdata_len);
ddd29ec6 DQ	185	} else
	186	return -EINVAL;
	187	out:
988d186d MS	188	return error;
	189	}
	190
8215534c MS	191	static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
	192	{
	193	inode->i_mode = mode;
8215534c MS	194	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	195	}
	196
	197	static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
	198	{
	199	inode->i_mode = iattr->ia_mode;
	200	inode->i_uid = iattr->ia_uid;
	201	inode->i_gid = iattr->ia_gid;
	202	inode->i_atime = iattr->ia_atime;
	203	inode->i_mtime = iattr->ia_mtime;
	204	inode->i_ctime = iattr->ia_ctime;
	205	}
	206
232ba9db AV	207
	208	/*
	209	* sysfs has a different i_mutex lock order behavior for i_mutex than other
	210	* filesystems; sysfs i_mutex is called in many places with subsystem locks
	211	* held. At the same time, many of the VFS locking rules do not apply to
	212	* sysfs at all (cross directory rename for example). To untangle this mess
	213	* (which gives false positives in lockdep), we're giving sysfs inodes their
	214	* own class for i_mutex.
	215	*/
	216	static struct lock_class_key sysfs_inode_imutex_key;
	217
372e88bd EB	218	static int sysfs_count_nlink(struct sysfs_dirent *sd)
	219	{
	220	struct sysfs_dirent *child;
	221	int nr = 0;
	222
bc747f37	223	for (child = sd->s_dir.children; child; child = child->s_sibling)
372e88bd EB	224	if (sysfs_type(child) == SYSFS_DIR)
	225	nr++;
	226
	227	return nr + 2;
	228	}
	229
bc37e283	230	static void sysfs_init_inode(struct sysfs_dirent sd, struct inode inode)
1da177e4	231	{
372e88bd	232	struct bin_attribute *bin_attr;
ddd29ec6	233	struct sysfs_inode_attrs *iattrs;
372e88bd	234
04256b4a	235	inode->i_private = sysfs_get(sd);
fc9f54b9 TH	236	inode->i_mapping->a_ops = &sysfs_aops;
	237	inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
	238	inode->i_op = &sysfs_inode_operations;
	239	inode->i_ino = sd->s_ino;
	240	lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
	241
ddd29ec6 DQ	242	iattrs = sd->s_iattr;
ddd29ec6 DQ	243	if (iattrs) {
fc9f54b9 TH	244	/* sysfs_dirent has non-default attributes
	245	* get them for the new inode from persistent copy
	246	* in sysfs_dirent
	247	*/
ddd29ec6 DQ	248	set_inode_attr(inode, &iattrs->ia_iattr);
	249	if (iattrs->ia_secdata)
	250	security_inode_notifysecctx(inode,
	251	iattrs->ia_secdata,
	252	iattrs->ia_secdata_len);
fc9f54b9 TH	253	} else
fc9f54b9 TH	254	set_default_inode_attr(inode, sd->s_mode);
372e88bd	255
372e88bd EB	256	/* initialize inode according to type */
372e88bd EB	257	switch (sysfs_type(sd)) {
372e88bd EB	258	case SYSFS_DIR:
	259	inode->i_op = &sysfs_dir_inode_operations;
	260	inode->i_fop = &sysfs_dir_operations;
	261	inode->i_nlink = sysfs_count_nlink(sd);
	262	break;
	263	case SYSFS_KOBJ_ATTR:
	264	inode->i_size = PAGE_SIZE;
	265	inode->i_fop = &sysfs_file_operations;
	266	break;
	267	case SYSFS_KOBJ_BIN_ATTR:
b1fc3d61	268	bin_attr = sd->s_bin_attr.bin_attr;
372e88bd EB	269	inode->i_size = bin_attr->size;
	270	inode->i_fop = &bin_fops;
	271	break;
	272	case SYSFS_KOBJ_LINK:
	273	inode->i_op = &sysfs_symlink_inode_operations;
	274	break;
	275	default:
	276	BUG();
	277	}
	278
	279	unlock_new_inode(inode);
fc9f54b9 TH	280	}
	281
	282	/**
8312a8d7	283	* sysfs_get_inode - get inode for sysfs_dirent
fc9f54b9 TH	284	* @sd: sysfs_dirent to allocate inode for
fc9f54b9 TH	285	*
8312a8d7 TH	286	* Get inode for @sd. If such inode doesn't exist, a new inode
	287	* is allocated and basics are initialized. New inode is
	288	* returned locked.
fc9f54b9 TH	289	*
	290	* LOCKING:
	291	* Kernel thread context (may sleep).
	292	*
	293	* RETURNS:
	294	* Pointer to allocated inode on success, NULL on failure.
	295	*/
8312a8d7	296	struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
fc9f54b9 TH	297	{
	298	struct inode *inode;
	299
8312a8d7 TH	300	inode = iget_locked(sysfs_sb, sd->s_ino);
8312a8d7 TH	301	if (inode && (inode->i_state & I_NEW))
fc9f54b9 TH	302	sysfs_init_inode(sd, inode);
fc9f54b9 TH	303
1da177e4 LT	304	return inode;
	305	}
	306
04256b4a EB	307	/*
	308	* The sysfs_dirent serves as both an inode and a directory entry for sysfs.
	309	* To prevent the sysfs inode numbers from being freed prematurely we take a
	310	* reference to sysfs_dirent from the sysfs inode. A
	311	* super_operations.delete_inode() implementation is needed to drop that
	312	* reference upon inode destruction.
	313	*/
	314	void sysfs_delete_inode(struct inode *inode)
	315	{
	316	struct sysfs_dirent *sd = inode->i_private;
	317
	318	truncate_inode_pages(&inode->i_data, 0);
	319	clear_inode(inode);
	320	sysfs_put(sd);
	321	}
	322
608e266a	323	int sysfs_hash_and_remove(struct sysfs_dirent dir_sd, const char name)
1da177e4	324	{
fb6896da	325	struct sysfs_addrm_cxt acxt;
41fc1c27	326	struct sysfs_dirent *sd;
641e6f30	327
608e266a	328	if (!dir_sd)
995982ca	329	return -ENOENT;
1da177e4	330
fb6896da	331	sysfs_addrm_start(&acxt, dir_sd);
608e266a	332
41fc1c27 TH	333	sd = sysfs_find_dirent(dir_sd, name);
	334	if (sd)
	335	sysfs_remove_one(&acxt, sd);
3007e997	336
990e53f8 TH	337	sysfs_addrm_finish(&acxt);
	338
	339	if (sd)
fb6896da	340	return 0;
990e53f8 TH	341	else
990e53f8 TH	342	return -ENOENT;
1da177e4	343	}