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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
NeilBrown4ef67a82014-10-14 16:57:26 +1100105/* kernfs read callback for regular sysfs files with pre-alloc */
106static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
107 size_t count, loff_t pos)
108{
109 const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
110 struct kobject *kobj = of->kn->parent->priv;
111
112 /*
113 * If buf != of->prealloc_buf, we don't know how
114 * large it is, so cannot safely pass it to ->show
115 */
116 if (pos || WARN_ON_ONCE(buf != of->prealloc_buf))
117 return 0;
118 return ops->show(kobj, of->kn->priv, buf);
119}
120
Tejun Heo50b38ca2013-11-28 14:54:17 -0500121/* kernfs write callback for regular sysfs files */
Tejun Heoc525aad2013-12-11 14:11:55 -0500122static ssize_t sysfs_kf_write(struct kernfs_open_file *of, char *buf,
Tejun Heo50b38ca2013-11-28 14:54:17 -0500123 size_t count, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Tejun Heo324a56e2013-12-11 14:11:53 -0500125 const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500126 struct kobject *kobj = of->kn->parent->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Tejun Heo50b38ca2013-11-28 14:54:17 -0500128 if (!count)
129 return 0;
130
Tejun Heo324a56e2013-12-11 14:11:53 -0500131 return ops->store(kobj, of->kn->priv, buf, count);
Tejun Heo50b38ca2013-11-28 14:54:17 -0500132}
133
134/* kernfs write callback for bin sysfs files */
Tejun Heoc525aad2013-12-11 14:11:55 -0500135static ssize_t sysfs_kf_bin_write(struct kernfs_open_file *of, char *buf,
Tejun Heo50b38ca2013-11-28 14:54:17 -0500136 size_t count, loff_t pos)
137{
Tejun Heo324a56e2013-12-11 14:11:53 -0500138 struct bin_attribute *battr = of->kn->priv;
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500139 struct kobject *kobj = of->kn->parent->priv;
Tejun Heo50b38ca2013-11-28 14:54:17 -0500140 loff_t size = file_inode(of->file)->i_size;
141
142 if (size) {
143 if (size <= pos)
Vladimir Zapolskiy09368962014-09-24 18:21:04 +0300144 return -EFBIG;
Tejun Heo50b38ca2013-11-28 14:54:17 -0500145 count = min_t(ssize_t, count, size - pos);
Tejun Heo8ef445f2013-10-01 17:42:01 -0400146 }
Tejun Heo50b38ca2013-11-28 14:54:17 -0500147 if (!count)
148 return 0;
Tejun Heo0ab66082007-06-14 03:45:16 +0900149
Tejun Heo50b38ca2013-11-28 14:54:17 -0500150 if (!battr->write)
151 return -EIO;
Tejun Heof9b9a622013-10-01 17:42:05 -0400152
Tejun Heo50b38ca2013-11-28 14:54:17 -0500153 return battr->write(of->file, kobj, battr, buf, pos, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
Tejun Heoc525aad2013-12-11 14:11:55 -0500156static int sysfs_kf_bin_mmap(struct kernfs_open_file *of,
Tejun Heofdbffaa2013-11-28 14:54:18 -0500157 struct vm_area_struct *vma)
158{
Tejun Heo324a56e2013-12-11 14:11:53 -0500159 struct bin_attribute *battr = of->kn->priv;
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500160 struct kobject *kobj = of->kn->parent->priv;
Tejun Heofdbffaa2013-11-28 14:54:18 -0500161
Tejun Heofdbffaa2013-11-28 14:54:18 -0500162 return battr->mmap(of->file, kobj, battr, vma);
163}
164
Tejun Heo324a56e2013-12-11 14:11:53 -0500165void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr)
NeilBrown4508a7a2006-03-20 17:53:53 +1100166{
Tejun Heo324a56e2013-12-11 14:11:53 -0500167 struct kernfs_node *kn = kobj->sd, *tmp;
NeilBrown4508a7a2006-03-20 17:53:53 +1100168
Tejun Heo324a56e2013-12-11 14:11:53 -0500169 if (kn && dir)
170 kn = kernfs_find_and_get(kn, dir);
Tejun Heo024f6472013-11-28 14:54:27 -0500171 else
Tejun Heo324a56e2013-12-11 14:11:53 -0500172 kernfs_get(kn);
Tejun Heo51225032007-06-14 04:27:25 +0900173
Tejun Heo324a56e2013-12-11 14:11:53 -0500174 if (kn && attr) {
175 tmp = kernfs_find_and_get(kn, attr);
176 kernfs_put(kn);
177 kn = tmp;
Tejun Heo024f6472013-11-28 14:54:27 -0500178 }
179
Tejun Heo324a56e2013-12-11 14:11:53 -0500180 if (kn) {
181 kernfs_notify(kn);
182 kernfs_put(kn);
Tejun Heo024f6472013-11-28 14:54:27 -0500183 }
NeilBrown4508a7a2006-03-20 17:53:53 +1100184}
185EXPORT_SYMBOL_GPL(sysfs_notify);
186
Tejun Heof6acf8b2013-11-28 14:54:21 -0500187static const struct kernfs_ops sysfs_file_kfops_empty = {
188};
189
190static const struct kernfs_ops sysfs_file_kfops_ro = {
191 .seq_show = sysfs_kf_seq_show,
192};
193
194static const struct kernfs_ops sysfs_file_kfops_wo = {
195 .write = sysfs_kf_write,
196};
197
198static const struct kernfs_ops sysfs_file_kfops_rw = {
199 .seq_show = sysfs_kf_seq_show,
200 .write = sysfs_kf_write,
201};
202
NeilBrown4ef67a82014-10-14 16:57:26 +1100203static const struct kernfs_ops sysfs_prealloc_kfops_ro = {
204 .read = sysfs_kf_read,
205 .prealloc = true,
206};
207
NeilBrown2b758692014-10-13 16:41:28 +1100208static const struct kernfs_ops sysfs_prealloc_kfops_wo = {
209 .write = sysfs_kf_write,
210 .prealloc = true,
211};
212
213static const struct kernfs_ops sysfs_prealloc_kfops_rw = {
NeilBrown4ef67a82014-10-14 16:57:26 +1100214 .read = sysfs_kf_read,
NeilBrown2b758692014-10-13 16:41:28 +1100215 .write = sysfs_kf_write,
216 .prealloc = true,
217};
218
Tejun Heof6acf8b2013-11-28 14:54:21 -0500219static const struct kernfs_ops sysfs_bin_kfops_ro = {
220 .read = sysfs_kf_bin_read,
221};
222
223static const struct kernfs_ops sysfs_bin_kfops_wo = {
224 .write = sysfs_kf_bin_write,
225};
226
227static const struct kernfs_ops sysfs_bin_kfops_rw = {
228 .read = sysfs_kf_bin_read,
229 .write = sysfs_kf_bin_write,
Tejun Heo9b2db6e2013-12-10 09:29:17 -0500230};
231
232static const struct kernfs_ops sysfs_bin_kfops_mmap = {
233 .read = sysfs_kf_bin_read,
234 .write = sysfs_kf_bin_write,
Tejun Heof6acf8b2013-11-28 14:54:21 -0500235 .mmap = sysfs_kf_bin_mmap,
236};
237
Tejun Heo324a56e2013-12-11 14:11:53 -0500238int sysfs_add_file_mode_ns(struct kernfs_node *parent,
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500239 const struct attribute *attr, bool is_bin,
Tejun Heo496f7392013-11-28 14:54:24 -0500240 umode_t mode, const void *ns)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241{
Tejun Heo517e64f2013-11-28 14:54:29 -0500242 struct lock_class_key *key = NULL;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500243 const struct kernfs_ops *ops;
Tejun Heo324a56e2013-12-11 14:11:53 -0500244 struct kernfs_node *kn;
Tejun Heo471bd7b2013-11-28 14:54:22 -0500245 loff_t size;
Tejun Heoa26cd722007-06-14 03:45:14 +0900246
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500247 if (!is_bin) {
Tejun Heo324a56e2013-12-11 14:11:53 -0500248 struct kobject *kobj = parent->priv;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500249 const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
250
251 /* every kobject with an attribute needs a ktype assigned */
252 if (WARN(!sysfs_ops, KERN_ERR
253 "missing sysfs attribute operations for kobject: %s\n",
254 kobject_name(kobj)))
255 return -EINVAL;
256
NeilBrown2b758692014-10-13 16:41:28 +1100257 if (sysfs_ops->show && sysfs_ops->store) {
258 if (mode & SYSFS_PREALLOC)
259 ops = &sysfs_prealloc_kfops_rw;
260 else
261 ops = &sysfs_file_kfops_rw;
NeilBrown4ef67a82014-10-14 16:57:26 +1100262 } else if (sysfs_ops->show) {
263 if (mode & SYSFS_PREALLOC)
264 ops = &sysfs_prealloc_kfops_ro;
265 else
266 ops = &sysfs_file_kfops_ro;
267 } else if (sysfs_ops->store) {
NeilBrown2b758692014-10-13 16:41:28 +1100268 if (mode & SYSFS_PREALLOC)
269 ops = &sysfs_prealloc_kfops_wo;
270 else
271 ops = &sysfs_file_kfops_wo;
272 } else
Tejun Heof6acf8b2013-11-28 14:54:21 -0500273 ops = &sysfs_file_kfops_empty;
Tejun Heo471bd7b2013-11-28 14:54:22 -0500274
275 size = PAGE_SIZE;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500276 } else {
277 struct bin_attribute *battr = (void *)attr;
278
Tejun Heo9b2db6e2013-12-10 09:29:17 -0500279 if (battr->mmap)
280 ops = &sysfs_bin_kfops_mmap;
281 else if (battr->read && battr->write)
Tejun Heof6acf8b2013-11-28 14:54:21 -0500282 ops = &sysfs_bin_kfops_rw;
283 else if (battr->read)
284 ops = &sysfs_bin_kfops_ro;
285 else if (battr->write)
286 ops = &sysfs_bin_kfops_wo;
287 else
288 ops = &sysfs_file_kfops_empty;
Tejun Heo471bd7b2013-11-28 14:54:22 -0500289
290 size = battr->size;
Tejun Heof6acf8b2013-11-28 14:54:21 -0500291 }
292
Tejun Heo517e64f2013-11-28 14:54:29 -0500293#ifdef CONFIG_DEBUG_LOCK_ALLOC
294 if (!attr->ignore_lockdep)
295 key = attr->key ?: (struct lock_class_key *)&attr->skey;
296#endif
NeilBrown2b758692014-10-13 16:41:28 +1100297 kn = __kernfs_create_file(parent, attr->name, mode & 0777, size, ops,
Tejun Heodfeb07502015-02-13 14:36:31 -0800298 (void *)attr, ns, key);
Tejun Heo324a56e2013-12-11 14:11:53 -0500299 if (IS_ERR(kn)) {
300 if (PTR_ERR(kn) == -EEXIST)
301 sysfs_warn_dup(parent, attr->name);
302 return PTR_ERR(kn);
Tejun Heo496f7392013-11-28 14:54:24 -0500303 }
304 return 0;
305}
306
Tejun Heo324a56e2013-12-11 14:11:53 -0500307int sysfs_add_file(struct kernfs_node *parent, const struct attribute *attr,
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500308 bool is_bin)
James Bottomley0f423892008-03-20 20:47:52 -0500309{
Tejun Heo324a56e2013-12-11 14:11:53 -0500310 return sysfs_add_file_mode_ns(parent, attr, is_bin, attr->mode, NULL);
James Bottomley0f423892008-03-20 20:47:52 -0500311}
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313/**
Tejun Heo58292cbe2013-09-11 22:29:04 -0400314 * sysfs_create_file_ns - create an attribute file for an object with custom ns
315 * @kobj: object we're creating for
316 * @attr: attribute descriptor
317 * @ns: namespace the new file should belong to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 */
Tejun Heo58292cbe2013-09-11 22:29:04 -0400319int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr,
320 const void *ns)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Tejun Heo608e2662007-06-14 04:27:22 +0900322 BUG_ON(!kobj || !kobj->sd || !attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500324 return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode, ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
326}
Tejun Heo58292cbe2013-09-11 22:29:04 -0400327EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Andi Kleen1c205ae2010-01-05 12:48:01 +0100329int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr)
330{
331 int err = 0;
332 int i;
333
334 for (i = 0; ptr[i] && !err; i++)
335 err = sysfs_create_file(kobj, ptr[i]);
336 if (err)
337 while (--i >= 0)
338 sysfs_remove_file(kobj, ptr[i]);
339 return err;
340}
Greg Kroah-Hartman1b866752013-08-21 16:17:47 -0700341EXPORT_SYMBOL_GPL(sysfs_create_files);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343/**
Alan Sterndfa87c82007-02-20 15:02:44 -0500344 * sysfs_add_file_to_group - add an attribute file to a pre-existing group.
345 * @kobj: object we're acting for.
346 * @attr: attribute descriptor.
347 * @group: group name.
348 */
349int sysfs_add_file_to_group(struct kobject *kobj,
350 const struct attribute *attr, const char *group)
351{
Tejun Heo324a56e2013-12-11 14:11:53 -0500352 struct kernfs_node *parent;
Alan Sterndfa87c82007-02-20 15:02:44 -0500353 int error;
354
Tejun Heoccf73cf2013-11-28 14:54:30 -0500355 if (group) {
Tejun Heo324a56e2013-12-11 14:11:53 -0500356 parent = kernfs_find_and_get(kobj->sd, group);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500357 } else {
Tejun Heo324a56e2013-12-11 14:11:53 -0500358 parent = kobj->sd;
359 kernfs_get(parent);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500360 }
James Bottomley11f24fb2008-01-02 18:44:05 -0600361
Tejun Heo324a56e2013-12-11 14:11:53 -0500362 if (!parent)
Tejun Heo608e2662007-06-14 04:27:22 +0900363 return -ENOENT;
364
Tejun Heo324a56e2013-12-11 14:11:53 -0500365 error = sysfs_add_file(parent, attr, false);
366 kernfs_put(parent);
Tejun Heo608e2662007-06-14 04:27:22 +0900367
Alan Sterndfa87c82007-02-20 15:02:44 -0500368 return error;
369}
370EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372/**
Kay Sievers31e5abe2005-04-18 21:57:32 -0700373 * sysfs_chmod_file - update the modified mode value on an object attribute.
374 * @kobj: object we're acting for.
375 * @attr: attribute descriptor.
376 * @mode: file permissions.
377 *
378 */
Jean Delvare49c19402010-07-02 16:54:05 +0200379int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
Al Viro48176a92011-07-24 03:40:40 -0400380 umode_t mode)
Kay Sievers31e5abe2005-04-18 21:57:32 -0700381{
Tejun Heo324a56e2013-12-11 14:11:53 -0500382 struct kernfs_node *kn;
Maneesh Sonibc062b12005-07-29 12:13:35 -0700383 struct iattr newattrs;
Tejun Heo51225032007-06-14 04:27:25 +0900384 int rc;
Kay Sievers31e5abe2005-04-18 21:57:32 -0700385
Tejun Heo324a56e2013-12-11 14:11:53 -0500386 kn = kernfs_find_and_get(kobj->sd, attr->name);
387 if (!kn)
Tejun Heo5d604182013-11-23 17:21:52 -0500388 return -ENOENT;
Tejun Heo51225032007-06-14 04:27:25 +0900389
Tejun Heoadc5e8b2013-12-11 14:11:54 -0500390 newattrs.ia_mode = (mode & S_IALLUGO) | (kn->mode & ~S_IALLUGO);
Eric W. Biederman4c6974f2009-11-07 23:27:02 -0800391 newattrs.ia_valid = ATTR_MODE;
Tejun Heof88123e2007-09-20 16:05:10 +0900392
Tejun Heo324a56e2013-12-11 14:11:53 -0500393 rc = kernfs_setattr(kn, &newattrs);
Tejun Heo5d604182013-11-23 17:21:52 -0500394
Tejun Heo324a56e2013-12-11 14:11:53 -0500395 kernfs_put(kn);
Tejun Heo51225032007-06-14 04:27:25 +0900396 return rc;
Kay Sievers31e5abe2005-04-18 21:57:32 -0700397}
398EXPORT_SYMBOL_GPL(sysfs_chmod_file);
399
Kay Sievers31e5abe2005-04-18 21:57:32 -0700400/**
Tejun Heo58292cbe2013-09-11 22:29:04 -0400401 * sysfs_remove_file_ns - remove an object attribute with a custom ns tag
402 * @kobj: object we're acting for
403 * @attr: attribute descriptor
404 * @ns: namespace tag of the file to remove
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 *
Tejun Heo58292cbe2013-09-11 22:29:04 -0400406 * Hash the attribute name and namespace tag and kill the victim.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 */
Tejun Heo58292cbe2013-09-11 22:29:04 -0400408void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
409 const void *ns)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Tejun Heo324a56e2013-12-11 14:11:53 -0500411 struct kernfs_node *parent = kobj->sd;
Eric W. Biederman487505c2011-10-12 21:53:38 +0000412
Tejun Heo324a56e2013-12-11 14:11:53 -0500413 kernfs_remove_by_name_ns(parent, attr->name, ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414}
Tejun Heo58292cbe2013-09-11 22:29:04 -0400415EXPORT_SYMBOL_GPL(sysfs_remove_file_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Tejun Heo6b0afc22014-02-03 14:03:01 -0500417/**
418 * sysfs_remove_file_self - remove an object attribute from its own method
419 * @kobj: object we're acting for
420 * @attr: attribute descriptor
421 *
422 * See kernfs_remove_self() for details.
423 */
424bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr)
425{
426 struct kernfs_node *parent = kobj->sd;
427 struct kernfs_node *kn;
428 bool ret;
429
430 kn = kernfs_find_and_get(parent, attr->name);
431 if (WARN_ON_ONCE(!kn))
432 return false;
433
434 ret = kernfs_remove_self(kn);
435
436 kernfs_put(kn);
437 return ret;
438}
439
Greg Kroah-Hartman1b18dc22013-08-21 16:28:26 -0700440void sysfs_remove_files(struct kobject *kobj, const struct attribute **ptr)
Andi Kleen1c205ae2010-01-05 12:48:01 +0100441{
442 int i;
443 for (i = 0; ptr[i]; i++)
444 sysfs_remove_file(kobj, ptr[i]);
445}
Greg Kroah-Hartman1b866752013-08-21 16:17:47 -0700446EXPORT_SYMBOL_GPL(sysfs_remove_files);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Alan Sterndfa87c82007-02-20 15:02:44 -0500448/**
449 * sysfs_remove_file_from_group - remove an attribute file from a group.
450 * @kobj: object we're acting for.
451 * @attr: attribute descriptor.
452 * @group: group name.
453 */
454void sysfs_remove_file_from_group(struct kobject *kobj,
455 const struct attribute *attr, const char *group)
456{
Tejun Heo324a56e2013-12-11 14:11:53 -0500457 struct kernfs_node *parent;
Alan Sterndfa87c82007-02-20 15:02:44 -0500458
Tejun Heoccf73cf2013-11-28 14:54:30 -0500459 if (group) {
Tejun Heo324a56e2013-12-11 14:11:53 -0500460 parent = kernfs_find_and_get(kobj->sd, group);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500461 } else {
Tejun Heo324a56e2013-12-11 14:11:53 -0500462 parent = kobj->sd;
463 kernfs_get(parent);
Tejun Heoccf73cf2013-11-28 14:54:30 -0500464 }
465
Tejun Heo324a56e2013-12-11 14:11:53 -0500466 if (parent) {
467 kernfs_remove_by_name(parent, attr->name);
468 kernfs_put(parent);
Alan Sterndfa87c82007-02-20 15:02:44 -0500469 }
470}
471EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group);
472
Tejun Heo3124eb12013-10-01 17:42:09 -0400473/**
474 * sysfs_create_bin_file - create binary file for object.
475 * @kobj: object.
476 * @attr: attribute descriptor.
477 */
478int sysfs_create_bin_file(struct kobject *kobj,
479 const struct bin_attribute *attr)
480{
481 BUG_ON(!kobj || !kobj->sd || !attr);
482
Tejun Heoa7dc66d2013-11-28 14:54:23 -0500483 return sysfs_add_file(kobj->sd, &attr->attr, true);
Tejun Heo3124eb12013-10-01 17:42:09 -0400484}
485EXPORT_SYMBOL_GPL(sysfs_create_bin_file);
486
487/**
488 * sysfs_remove_bin_file - remove binary file for object.
489 * @kobj: object.
490 * @attr: attribute descriptor.
491 */
492void sysfs_remove_bin_file(struct kobject *kobj,
493 const struct bin_attribute *attr)
494{
Tejun Heo879f40d2013-11-23 17:21:49 -0500495 kernfs_remove_by_name(kobj->sd, attr->attr.name);
Tejun Heo3124eb12013-10-01 17:42:09 -0400496}
497EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);