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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Tejun Heo6d66f5c2007-09-20 17:31:38 +09002 * fs/sysfs/file.c - sysfs regular (text) file implementation
3 *
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.
9 *
10 * Please see Documentation/filesystems/sysfs.txt for more information.
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
13#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/kobject.h>
Andrew Morton815d2d52008-03-04 15:09:07 -080015#include <linux/kallsyms.h>
Robert P. J. Dayc6f87732008-03-13 22:41:52 -040016#include <linux/slab.h>
Oliver Neukum94bebf42006-12-20 10:52:44 +010017#include <linux/list.h>
Dave Young52e8c202007-07-26 11:03:54 +000018#include <linux/mutex.h>
Tejun Heo13c589d2013-10-01 17:42:02 -040019#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21#include "sysfs.h"
Tejun Heo414985a2013-11-28 14:54:34 -050022#include "../kernfs/kernfs-internal.h"
Tejun Heof6acf8b2013-11-28 14:54:21 -050023
24/*
Tejun Heo324a56e2013-12-11 14:11:53 -050025 * Determine ktype->sysfs_ops for the given kernfs_node. This function
Tejun Heo375b6112013-10-01 17:41:57 -040026 * must be called while holding an active reference.
27 */
Tejun Heo324a56e2013-12-11 14:11:53 -050028static const struct sysfs_ops *sysfs_file_ops(struct kernfs_node *kn)
Tejun Heo375b6112013-10-01 17:41:57 -040029{
Tejun Heoadc5e8b2013-12-11 14:11:54 -050030 struct kobject *kobj = kn->parent->priv;
Tejun Heo375b6112013-10-01 17:41:57 -040031
Tejun Heodf23fc32013-12-11 14:11:56 -050032 if (kn->flags & KERNFS_LOCKDEP)
Tejun Heo324a56e2013-12-11 14:11:53 -050033 lockdep_assert_held(kn);
Tejun Heo375b6112013-10-01 17:41:57 -040034 return kobj->ktype ? kobj->ktype->sysfs_ops : NULL;
35}
36
Tejun Heo13c589d2013-10-01 17:42:02 -040037/*
38 * Reads on sysfs are handled through seq_file, which takes care of hairy
39 * details like buffering and seeking. The following function pipes
40 * sysfs_ops->show() result through seq_file.
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 */
Tejun Heoc2b19da2013-11-28 14:54:16 -050042static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Tejun Heoc525aad2013-12-11 14:11:55 -050044 struct kernfs_open_file *of = sf->private;
Tejun Heoadc5e8b2013-12-11 14:11:54 -050045 struct kobject *kobj = of->kn->parent->priv;
Tejun Heo324a56e2013-12-11 14:11:53 -050046 const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 ssize_t count;
Tejun Heoc2b19da2013-11-28 14:54:16 -050048 char *buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Tejun Heof5c16f22014-05-19 15:52:10 -040050 /* acquire buffer and ensure that it's >= PAGE_SIZE and clear */
Tejun Heo13c589d2013-10-01 17:42:02 -040051 count = seq_get_buf(sf, &buf);
52 if (count < PAGE_SIZE) {
53 seq_commit(sf, -1);
54 return 0;
55 }
Tejun Heof5c16f22014-05-19 15:52:10 -040056 memset(buf, 0, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Tejun Heo13c589d2013-10-01 17:42:02 -040058 /*
Tejun Heoc2b19da2013-11-28 14:54:16 -050059 * Invoke show(). Control may reach here via seq file lseek even
60 * if @ops->show() isn't implemented.
Tejun Heo13c589d2013-10-01 17:42:02 -040061 */
Tejun Heoc2b19da2013-11-28 14:54:16 -050062 if (ops->show) {
Tejun Heo324a56e2013-12-11 14:11:53 -050063 count = ops->show(kobj, of->kn->priv, buf);
Tejun Heoc2b19da2013-11-28 14:54:16 -050064 if (count < 0)
65 return count;
66 }
Tejun Heo0ab66082007-06-14 03:45:16 +090067
Miao Xie8118a852007-11-21 14:55:19 -080068 /*
69 * The code works fine with PAGE_SIZE return but it's likely to
70 * indicate truncated result or overflow in normal use cases.
71 */
Andrew Morton815d2d52008-03-04 15:09:07 -080072 if (count >= (ssize_t)PAGE_SIZE) {
73 print_symbol("fill_read_buffer: %s returned bad count\n",
74 (unsigned long)ops->show);
75 /* Try to struggle along */
76 count = PAGE_SIZE - 1;
77 }
Tejun Heo13c589d2013-10-01 17:42:02 -040078 seq_commit(sf, count);
79 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
Tejun Heoc525aad2013-12-11 14:11:55 -050082static ssize_t sysfs_kf_bin_read(struct kernfs_open_file *of, char *buf,
Tejun Heoc2b19da2013-11-28 14:54:16 -050083 size_t count, loff_t pos)
Tejun Heo2f0c6b72013-10-01 17:42:06 -040084{
Tejun Heo324a56e2013-12-11 14:11:53 -050085 struct bin_attribute *battr = of->kn->priv;
Tejun Heoadc5e8b2013-12-11 14:11:54 -050086 struct kobject *kobj = of->kn->parent->priv;
Tejun Heoc2b19da2013-11-28 14:54:16 -050087 loff_t size = file_inode(of->file)->i_size;
Tejun Heo2f0c6b72013-10-01 17:42:06 -040088
Tejun Heoc2b19da2013-11-28 14:54:16 -050089 if (!count)
Tejun Heo2f0c6b72013-10-01 17:42:06 -040090 return 0;
91
92 if (size) {
Tejun Heoc2b19da2013-11-28 14:54:16 -050093 if (pos > size)
Tejun Heo2f0c6b72013-10-01 17:42:06 -040094 return 0;
Tejun Heoc2b19da2013-11-28 14:54:16 -050095 if (pos + count > size)
96 count = size - pos;
Tejun Heo2f0c6b72013-10-01 17:42:06 -040097 }
98
Tejun Heoc2b19da2013-11-28 14:54:16 -050099 if (!battr->read)
100 return -EIO;
101
102 return battr->read(of->file, kobj, battr, buf, pos, count);
103}
104
Tejun Heo50b38ca2013-11-28 14:54:17 -0500105/* kernfs write callback for regular sysfs files */
Tejun Heoc525aad2013-12-11 14:11:55 -0500106static ssize_t sysfs_kf_write(struct kernfs_open_file *of, char *buf,
Tejun Heo50b38ca2013-11-28 14:54:17 -0500107 size_t count, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
Tejun Heo324a56e2013-12-11 14:11:53 -0500109 const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500110 struct kobject *kobj = of->kn->parent->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Tejun Heo50b38ca2013-11-28 14:54:17 -0500112 if (!count)
113 return 0;
114
Tejun Heo324a56e2013-12-11 14:11:53 -0500115 return ops->store(kobj, of->kn->priv, buf, count);
Tejun Heo50b38ca2013-11-28 14:54:17 -0500116}
117
118/* kernfs write callback for bin sysfs files */
Tejun Heoc525aad2013-12-11 14:11:55 -0500119static ssize_t sysfs_kf_bin_write(struct kernfs_open_file *of, char *buf,
Tejun Heo50b38ca2013-11-28 14:54:17 -0500120 size_t count, loff_t pos)
121{
Tejun Heo324a56e2013-12-11 14:11:53 -0500122 struct bin_attribute *battr = of->kn->priv;
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500123 struct kobject *kobj = of->kn->parent->priv;
Tejun Heo50b38ca2013-11-28 14:54:17 -0500124 loff_t size = file_inode(of->file)->i_size;
125
126 if (size) {
127 if (size <= pos)
128 return 0;
129 count = min_t(ssize_t, count, size - pos);
Tejun Heo8ef445f2013-10-01 17:42:01 -0400130 }
Tejun Heo50b38ca2013-11-28 14:54:17 -0500131 if (!count)
132 return 0;
Tejun Heo0ab66082007-06-14 03:45:16 +0900133
Tejun Heo50b38ca2013-11-28 14:54:17 -0500134 if (!battr->write)
135 return -EIO;
Tejun Heof9b9a622013-10-01 17:42:05 -0400136
Tejun Heo50b38ca2013-11-28 14:54:17 -0500137 return battr->write(of->file, kobj, battr, buf, pos, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
Tejun Heoc525aad2013-12-11 14:11:55 -0500140static int sysfs_kf_bin_mmap(struct kernfs_open_file *of,
Tejun Heofdbffaa2013-11-28 14:54:18 -0500141 struct vm_area_struct *vma)
142{
Tejun Heo324a56e2013-12-11 14:11:53 -0500143 struct bin_attribute *battr = of->kn->priv;
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500144 struct kobject *kobj = of->kn->parent->priv;
Tejun Heofdbffaa2013-11-28 14:54:18 -0500145
Tejun Heofdbffaa2013-11-28 14:54:18 -0500146 return battr->mmap(of->file, kobj, battr, vma);
147}
148
Tejun Heo324a56e2013-12-11 14:11:53 -0500149void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr)
NeilBrown4508a7a2006-03-20 17:53:53 +1100150{
Tejun Heo324a56e2013-12-11 14:11:53 -0500151 struct kernfs_node *kn = kobj->sd, *tmp;
NeilBrown4508a7a2006-03-20 17:53:53 +1100152
Tejun Heo324a56e2013-12-11 14:11:53 -0500153 if (kn && dir)
154 kn = kernfs_find_and_get(kn, dir);
Tejun Heo024f6472013-11-28 14:54:27 -0500155 else
Tejun Heo324a56e2013-12-11 14:11:53 -0500156 kernfs_get(kn);
Tejun Heo51225032007-06-14 04:27:25 +0900157
Tejun Heo324a56e2013-12-11 14:11:53 -0500158 if (kn && attr) {
159 tmp = kernfs_find_and_get(kn, attr);
160 kernfs_put(kn);
161 kn = tmp;
Tejun Heo024f6472013-11-28 14:54:27 -0500162 }
163
Tejun Heo324a56e2013-12-11 14:11:53 -0500164 if (kn) {
165 kernfs_notify(kn);
166 kernfs_put(kn);
Tejun Heo024f6472013-11-28 14:54:27 -0500167 }
NeilBrown4508a7a2006-03-20 17:53:53 +1100168}
169EXPORT_SYMBOL_GPL(sysfs_notify);
170
Tejun Heof6acf8b2013-11-28 14:54:21 -0500171static const struct kernfs_ops sysfs_file_kfops_empty = {
172};
173
174static const struct kernfs_ops sysfs_file_kfops_ro = {
175 .seq_show = sysfs_kf_seq_show,
176};
177
178static const struct kernfs_ops sysfs_file_kfops_wo = {
179 .write = sysfs_kf_write,
180};
181
182static const struct kernfs_ops sysfs_file_kfops_rw = {
183 .seq_show = sysfs_kf_seq_show,
184 .write = sysfs_kf_write,
185};
186
187static const struct kernfs_ops sysfs_bin_kfops_ro = {
188 .read = sysfs_kf_bin_read,
189};
190
191static const struct kernfs_ops sysfs_bin_kfops_wo = {
192 .write = sysfs_kf_bin_write,
193};
194
195static const struct kernfs_ops sysfs_bin_kfops_rw = {
196 .read = sysfs_kf_bin_read,
197 .write = sysfs_kf_bin_write,
Tejun Heo9b2db6e2013-12-10 09:29:17 -0500198};
199
200static const struct kernfs_ops sysfs_bin_kfops_mmap = {
201 .read = sysfs_kf_bin_read,
202 .write = sysfs_kf_bin_write,
Tejun Heof6acf8b2013-11-28 14:54:21 -0500203 .mmap = sysfs_kf_bin_mmap,
204};
205
Tejun Heo324a56e2013-12-11 14:11:53 -0500206int sysfs_add_file_mode_ns(struct kernfs_node *parent,
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500207 const struct attribute *attr, bool is_bin,
Tejun Heo496f7392013-11-28 14:54:24 -0500208 umode_t mode, const void *ns)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Tejun Heo517e64f2013-11-28 14:54:29 -0500210 struct lock_class_key *key = NULL;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500211 const struct kernfs_ops *ops;
Tejun Heo324a56e2013-12-11 14:11:53 -0500212 struct kernfs_node *kn;
Tejun Heo471bd7b2013-11-28 14:54:22 -0500213 loff_t size;
Tejun Heoa26cd722007-06-14 03:45:14 +0900214
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500215 if (!is_bin) {
Tejun Heo324a56e2013-12-11 14:11:53 -0500216 struct kobject *kobj = parent->priv;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500217 const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
218
219 /* every kobject with an attribute needs a ktype assigned */
220 if (WARN(!sysfs_ops, KERN_ERR
221 "missing sysfs attribute operations for kobject: %s\n",
222 kobject_name(kobj)))
223 return -EINVAL;
224
225 if (sysfs_ops->show && sysfs_ops->store)
226 ops = &sysfs_file_kfops_rw;
227 else if (sysfs_ops->show)
228 ops = &sysfs_file_kfops_ro;
229 else if (sysfs_ops->store)
230 ops = &sysfs_file_kfops_wo;
231 else
232 ops = &sysfs_file_kfops_empty;
Tejun Heo471bd7b2013-11-28 14:54:22 -0500233
234 size = PAGE_SIZE;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500235 } else {
236 struct bin_attribute *battr = (void *)attr;
237
Tejun Heo9b2db6e2013-12-10 09:29:17 -0500238 if (battr->mmap)
239 ops = &sysfs_bin_kfops_mmap;
240 else if (battr->read && battr->write)
Tejun Heof6acf8b2013-11-28 14:54:21 -0500241 ops = &sysfs_bin_kfops_rw;
242 else if (battr->read)
243 ops = &sysfs_bin_kfops_ro;
244 else if (battr->write)
245 ops = &sysfs_bin_kfops_wo;
246 else
247 ops = &sysfs_file_kfops_empty;
Tejun Heo471bd7b2013-11-28 14:54:22 -0500248
249 size = battr->size;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500250 }
251
Tejun Heo517e64f2013-11-28 14:54:29 -0500252#ifdef CONFIG_DEBUG_LOCK_ALLOC
253 if (!attr->ignore_lockdep)
254 key = attr->key ?: (struct lock_class_key *)&attr->skey;
255#endif
Tejun Heo2063d602013-12-11 16:02:57 -0500256 kn = __kernfs_create_file(parent, attr->name, mode, size, ops,
257 (void *)attr, ns, true, key);
Tejun Heo324a56e2013-12-11 14:11:53 -0500258 if (IS_ERR(kn)) {
259 if (PTR_ERR(kn) == -EEXIST)
260 sysfs_warn_dup(parent, attr->name);
261 return PTR_ERR(kn);
Tejun Heo496f7392013-11-28 14:54:24 -0500262 }
263 return 0;
264}
265
Tejun Heo324a56e2013-12-11 14:11:53 -0500266int sysfs_add_file(struct kernfs_node *parent, const struct attribute *attr,
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500267 bool is_bin)
James Bottomley0f423892008-03-20 20:47:52 -0500268{
Tejun Heo324a56e2013-12-11 14:11:53 -0500269 return sysfs_add_file_mode_ns(parent, attr, is_bin, attr->mode, NULL);
James Bottomley0f423892008-03-20 20:47:52 -0500270}
271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272/**
Tejun Heo58292cbe2013-09-11 22:29:04 -0400273 * sysfs_create_file_ns - create an attribute file for an object with custom ns
274 * @kobj: object we're creating for
275 * @attr: attribute descriptor
276 * @ns: namespace the new file should belong to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 */
Tejun Heo58292cbe2013-09-11 22:29:04 -0400278int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr,
279 const void *ns)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Tejun Heo608e2662007-06-14 04:27:22 +0900281 BUG_ON(!kobj || !kobj->sd || !attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500283 return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode, ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285}
Tejun Heo58292cbe2013-09-11 22:29:04 -0400286EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Andi Kleen1c205ae2010-01-05 12:48:01 +0100288int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr)
289{
290 int err = 0;
291 int i;
292
293 for (i = 0; ptr[i] && !err; i++)
294 err = sysfs_create_file(kobj, ptr[i]);
295 if (err)
296 while (--i >= 0)
297 sysfs_remove_file(kobj, ptr[i]);
298 return err;
299}
Greg Kroah-Hartman1b866752013-08-21 16:17:47 -0700300EXPORT_SYMBOL_GPL(sysfs_create_files);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302/**
Alan Sterndfa87c82007-02-20 15:02:44 -0500303 * sysfs_add_file_to_group - add an attribute file to a pre-existing group.
304 * @kobj: object we're acting for.
305 * @attr: attribute descriptor.
306 * @group: group name.
307 */
308int sysfs_add_file_to_group(struct kobject *kobj,
309 const struct attribute *attr, const char *group)
310{
Tejun Heo324a56e2013-12-11 14:11:53 -0500311 struct kernfs_node *parent;
Alan Sterndfa87c82007-02-20 15:02:44 -0500312 int error;
313
Tejun Heoccf73cf2013-11-28 14:54:30 -0500314 if (group) {
Tejun Heo324a56e2013-12-11 14:11:53 -0500315 parent = kernfs_find_and_get(kobj->sd, group);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500316 } else {
Tejun Heo324a56e2013-12-11 14:11:53 -0500317 parent = kobj->sd;
318 kernfs_get(parent);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500319 }
James Bottomley11f24fb2008-01-02 18:44:05 -0600320
Tejun Heo324a56e2013-12-11 14:11:53 -0500321 if (!parent)
Tejun Heo608e2662007-06-14 04:27:22 +0900322 return -ENOENT;
323
Tejun Heo324a56e2013-12-11 14:11:53 -0500324 error = sysfs_add_file(parent, attr, false);
325 kernfs_put(parent);
Tejun Heo608e2662007-06-14 04:27:22 +0900326
Alan Sterndfa87c82007-02-20 15:02:44 -0500327 return error;
328}
329EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331/**
Kay Sievers31e5abe2005-04-18 21:57:32 -0700332 * sysfs_chmod_file - update the modified mode value on an object attribute.
333 * @kobj: object we're acting for.
334 * @attr: attribute descriptor.
335 * @mode: file permissions.
336 *
337 */
Jean Delvare49c19402010-07-02 16:54:05 +0200338int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
Al Viro48176a92011-07-24 03:40:40 -0400339 umode_t mode)
Kay Sievers31e5abe2005-04-18 21:57:32 -0700340{
Tejun Heo324a56e2013-12-11 14:11:53 -0500341 struct kernfs_node *kn;
Maneesh Sonibc062b12005-07-29 12:13:35 -0700342 struct iattr newattrs;
Tejun Heo51225032007-06-14 04:27:25 +0900343 int rc;
Kay Sievers31e5abe2005-04-18 21:57:32 -0700344
Tejun Heo324a56e2013-12-11 14:11:53 -0500345 kn = kernfs_find_and_get(kobj->sd, attr->name);
346 if (!kn)
Tejun Heo5d604182013-11-23 17:21:52 -0500347 return -ENOENT;
Tejun Heo51225032007-06-14 04:27:25 +0900348
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500349 newattrs.ia_mode = (mode & S_IALLUGO) | (kn->mode & ~S_IALLUGO);
Eric W. Biederman4c6974f2009-11-07 23:27:02 -0800350 newattrs.ia_valid = ATTR_MODE;
Tejun Heof88123e2007-09-20 16:05:10 +0900351
Tejun Heo324a56e2013-12-11 14:11:53 -0500352 rc = kernfs_setattr(kn, &newattrs);
Tejun Heo5d604182013-11-23 17:21:52 -0500353
Tejun Heo324a56e2013-12-11 14:11:53 -0500354 kernfs_put(kn);
Tejun Heo51225032007-06-14 04:27:25 +0900355 return rc;
Kay Sievers31e5abe2005-04-18 21:57:32 -0700356}
357EXPORT_SYMBOL_GPL(sysfs_chmod_file);
358
Kay Sievers31e5abe2005-04-18 21:57:32 -0700359/**
Tejun Heo58292cbe2013-09-11 22:29:04 -0400360 * sysfs_remove_file_ns - remove an object attribute with a custom ns tag
361 * @kobj: object we're acting for
362 * @attr: attribute descriptor
363 * @ns: namespace tag of the file to remove
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 *
Tejun Heo58292cbe2013-09-11 22:29:04 -0400365 * Hash the attribute name and namespace tag and kill the victim.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 */
Tejun Heo58292cbe2013-09-11 22:29:04 -0400367void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
368 const void *ns)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369{
Tejun Heo324a56e2013-12-11 14:11:53 -0500370 struct kernfs_node *parent = kobj->sd;
Eric W. Biederman487505c22011-10-12 21:53:38 +0000371
Tejun Heo324a56e2013-12-11 14:11:53 -0500372 kernfs_remove_by_name_ns(parent, attr->name, ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373}
Tejun Heo58292cbe2013-09-11 22:29:04 -0400374EXPORT_SYMBOL_GPL(sysfs_remove_file_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Tejun Heo6b0afc22014-02-03 14:03:01 -0500376/**
377 * sysfs_remove_file_self - remove an object attribute from its own method
378 * @kobj: object we're acting for
379 * @attr: attribute descriptor
380 *
381 * See kernfs_remove_self() for details.
382 */
383bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr)
384{
385 struct kernfs_node *parent = kobj->sd;
386 struct kernfs_node *kn;
387 bool ret;
388
389 kn = kernfs_find_and_get(parent, attr->name);
390 if (WARN_ON_ONCE(!kn))
391 return false;
392
393 ret = kernfs_remove_self(kn);
394
395 kernfs_put(kn);
396 return ret;
397}
398
Greg Kroah-Hartman1b18dc22013-08-21 16:28:26 -0700399void sysfs_remove_files(struct kobject *kobj, const struct attribute **ptr)
Andi Kleen1c205ae2010-01-05 12:48:01 +0100400{
401 int i;
402 for (i = 0; ptr[i]; i++)
403 sysfs_remove_file(kobj, ptr[i]);
404}
Greg Kroah-Hartman1b866752013-08-21 16:17:47 -0700405EXPORT_SYMBOL_GPL(sysfs_remove_files);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Alan Sterndfa87c82007-02-20 15:02:44 -0500407/**
408 * sysfs_remove_file_from_group - remove an attribute file from a group.
409 * @kobj: object we're acting for.
410 * @attr: attribute descriptor.
411 * @group: group name.
412 */
413void sysfs_remove_file_from_group(struct kobject *kobj,
414 const struct attribute *attr, const char *group)
415{
Tejun Heo324a56e2013-12-11 14:11:53 -0500416 struct kernfs_node *parent;
Alan Sterndfa87c82007-02-20 15:02:44 -0500417
Tejun Heoccf73cf2013-11-28 14:54:30 -0500418 if (group) {
Tejun Heo324a56e2013-12-11 14:11:53 -0500419 parent = kernfs_find_and_get(kobj->sd, group);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500420 } else {
Tejun Heo324a56e2013-12-11 14:11:53 -0500421 parent = kobj->sd;
422 kernfs_get(parent);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500423 }
424
Tejun Heo324a56e2013-12-11 14:11:53 -0500425 if (parent) {
426 kernfs_remove_by_name(parent, attr->name);
427 kernfs_put(parent);
Alan Sterndfa87c82007-02-20 15:02:44 -0500428 }
429}
430EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group);
431
Tejun Heo3124eb12013-10-01 17:42:09 -0400432/**
433 * sysfs_create_bin_file - create binary file for object.
434 * @kobj: object.
435 * @attr: attribute descriptor.
436 */
437int sysfs_create_bin_file(struct kobject *kobj,
438 const struct bin_attribute *attr)
439{
440 BUG_ON(!kobj || !kobj->sd || !attr);
441
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500442 return sysfs_add_file(kobj->sd, &attr->attr, true);
Tejun Heo3124eb12013-10-01 17:42:09 -0400443}
444EXPORT_SYMBOL_GPL(sysfs_create_bin_file);
445
446/**
447 * sysfs_remove_bin_file - remove binary file for object.
448 * @kobj: object.
449 * @attr: attribute descriptor.
450 */
451void sysfs_remove_bin_file(struct kobject *kobj,
452 const struct bin_attribute *attr)
453{
Tejun Heo879f40d2013-11-23 17:21:49 -0500454 kernfs_remove_by_name(kobj->sd, attr->attr.name);
Tejun Heo3124eb12013-10-01 17:42:09 -0400455}
456EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);