aboutsummaryrefslogtreecommitdiffstats
path: root/fs/sysfs/inode.c
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2013-11-28 14:54:32 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-29 20:55:10 -0500
commitffed24e22845a3da0ae01095ae3f11c8d16e889d (patch)
tree7431e61de58265fbc2e58dbe6a6e1d4053875f79 /fs/sysfs/inode.c
parentae6621b0716852146e4655fef7f74a181faa6c81 (diff)
sysfs, kernfs: move inode code to fs/kernfs/inode.c
There's nothing sysfs-specific in fs/sysfs/inode.c. Move everything in it to fs/kernfs/inode.c. The respective declarations in fs/sysfs/sysfs.h are moved to fs/kernfs/kernfs-internal.h. This is pure relocation. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/sysfs/inode.c')
-rw-r--r--fs/sysfs/inode.c342
1 files changed, 0 insertions, 342 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
deleted file mode 100644
index bfe4478f82bf..000000000000
--- a/fs/sysfs/inode.c
+++ /dev/null
@@ -1,342 +0,0 @@
1/*
2 * fs/sysfs/inode.c - basic sysfs inode and dentry operations
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.
11 */
12
13#undef DEBUG
14
15#include <linux/pagemap.h>
16#include <linux/namei.h>
17#include <linux/backing-dev.h>
18#include <linux/capability.h>
19#include <linux/errno.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/sysfs.h>
23#include <linux/xattr.h>
24#include <linux/security.h>
25#include "sysfs.h"
26
27static const struct address_space_operations sysfs_aops = {
28 .readpage = simple_readpage,
29 .write_begin = simple_write_begin,
30 .write_end = simple_write_end,
31};
32
33static struct backing_dev_info sysfs_backing_dev_info = {
34 .name = "sysfs",
35 .ra_pages = 0, /* No readahead */
36 .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
37};
38
39static const struct inode_operations sysfs_inode_operations = {
40 .permission = sysfs_permission,
41 .setattr = sysfs_setattr,
42 .getattr = sysfs_getattr,
43 .setxattr = sysfs_setxattr,
44};
45
46int __init sysfs_inode_init(void)
47{
48 return bdi_init(&sysfs_backing_dev_info);
49}
50
51static struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd)
52{
53 struct sysfs_inode_attrs *attrs;
54 struct iattr *iattrs;
55
56 attrs = kzalloc(sizeof(struct sysfs_inode_attrs), GFP_KERNEL);
57 if (!attrs)
58 return NULL;
59 iattrs = &attrs->ia_iattr;
60
61 /* assign default attributes */
62 iattrs->ia_mode = sd->s_mode;
63 iattrs->ia_uid = GLOBAL_ROOT_UID;
64 iattrs->ia_gid = GLOBAL_ROOT_GID;
65 iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;
66
67 return attrs;
68}
69
70static int __kernfs_setattr(struct sysfs_dirent *sd, const struct iattr *iattr)
71{
72 struct sysfs_inode_attrs *sd_attrs;
73 struct iattr *iattrs;
74 unsigned int ia_valid = iattr->ia_valid;
75
76 sd_attrs = sd->s_iattr;
77
78 if (!sd_attrs) {
79 /* setting attributes for the first time, allocate now */
80 sd_attrs = sysfs_init_inode_attrs(sd);
81 if (!sd_attrs)
82 return -ENOMEM;
83 sd->s_iattr = sd_attrs;
84 }
85 /* attributes were changed at least once in past */
86 iattrs = &sd_attrs->ia_iattr;
87
88 if (ia_valid & ATTR_UID)
89 iattrs->ia_uid = iattr->ia_uid;
90 if (ia_valid & ATTR_GID)
91 iattrs->ia_gid = iattr->ia_gid;
92 if (ia_valid & ATTR_ATIME)
93 iattrs->ia_atime = iattr->ia_atime;
94 if (ia_valid & ATTR_MTIME)
95 iattrs->ia_mtime = iattr->ia_mtime;
96 if (ia_valid & ATTR_CTIME)
97 iattrs->ia_ctime = iattr->ia_ctime;
98 if (ia_valid & ATTR_MODE) {
99 umode_t mode = iattr->ia_mode;
100 iattrs->ia_mode = sd->s_mode = mode;
101 }
102 return 0;
103}
104
105/**
106 * kernfs_setattr - set iattr on a node
107 * @sd: target node
108 * @iattr: iattr to set
109 *
110 * Returns 0 on success, -errno on failure.
111 */
112int kernfs_setattr(struct sysfs_dirent *sd, const struct iattr *iattr)
113{
114 int ret;
115
116 mutex_lock(&sysfs_mutex);
117 ret = __kernfs_setattr(sd, iattr);
118 mutex_unlock(&sysfs_mutex);
119 return ret;
120}
121
122int sysfs_setattr(struct dentry *dentry, struct iattr *iattr)
123{
124 struct inode *inode = dentry->d_inode;
125 struct sysfs_dirent *sd = dentry->d_fsdata;
126 int error;
127
128 if (!sd)
129 return -EINVAL;
130
131 mutex_lock(&sysfs_mutex);
132 error = inode_change_ok(inode, iattr);
133 if (error)
134 goto out;
135
136 error = __kernfs_setattr(sd, iattr);
137 if (error)
138 goto out;
139
140 /* this ignores size changes */
141 setattr_copy(inode, iattr);
142
143out:
144 mutex_unlock(&sysfs_mutex);
145 return error;
146}
147
148static int sysfs_sd_setsecdata(struct sysfs_dirent *sd, void **secdata,
149 u32 *secdata_len)
150{
151 struct sysfs_inode_attrs *iattrs;
152 void *old_secdata;
153 size_t old_secdata_len;
154
155 if (!sd->s_iattr) {
156 sd->s_iattr = sysfs_init_inode_attrs(sd);
157 if (!sd->s_iattr)
158 return -ENOMEM;
159 }
160
161 iattrs = sd->s_iattr;
162 old_secdata = iattrs->ia_secdata;
163 old_secdata_len = iattrs->ia_secdata_len;
164
165 iattrs->ia_secdata = *secdata;
166 iattrs->ia_secdata_len = *secdata_len;
167
168 *secdata = old_secdata;
169 *secdata_len = old_secdata_len;
170 return 0;
171}
172
173int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
174 size_t size, int flags)
175{
176 struct sysfs_dirent *sd = dentry->d_fsdata;
177 void *secdata;
178 int error;
179 u32 secdata_len = 0;
180
181 if (!sd)
182 return -EINVAL;
183
184 if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
185 const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
186 error = security_inode_setsecurity(dentry->d_inode, suffix,
187 value, size, flags);
188 if (error)
189 goto out;
190 error = security_inode_getsecctx(dentry->d_inode,
191 &secdata, &secdata_len);
192 if (error)
193 goto out;
194
195 mutex_lock(&sysfs_mutex);
196 error = sysfs_sd_setsecdata(sd, &secdata, &secdata_len);
197 mutex_unlock(&sysfs_mutex);
198
199 if (secdata)
200 security_release_secctx(secdata, secdata_len);
201 } else
202 return -EINVAL;
203out:
204 return error;
205}
206
207static inline void set_default_inode_attr(struct inode *inode, umode_t mode)
208{
209 inode->i_mode = mode;
210 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
211}
212
213static inline void set_inode_attr(struct inode *inode, struct iattr *iattr)
214{
215 inode->i_uid = iattr->ia_uid;
216 inode->i_gid = iattr->ia_gid;
217 inode->i_atime = iattr->ia_atime;
218 inode->i_mtime = iattr->ia_mtime;
219 inode->i_ctime = iattr->ia_ctime;
220}
221
222static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode)
223{
224 struct sysfs_inode_attrs *iattrs = sd->s_iattr;
225
226 inode->i_mode = sd->s_mode;
227 if (iattrs) {
228 /* sysfs_dirent has non-default attributes
229 * get them from persistent copy in sysfs_dirent
230 */
231 set_inode_attr(inode, &iattrs->ia_iattr);
232 security_inode_notifysecctx(inode,
233 iattrs->ia_secdata,
234 iattrs->ia_secdata_len);
235 }
236
237 if (sysfs_type(sd) == SYSFS_DIR)
238 set_nlink(inode, sd->s_dir.subdirs + 2);
239}
240
241int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
242 struct kstat *stat)
243{
244 struct sysfs_dirent *sd = dentry->d_fsdata;
245 struct inode *inode = dentry->d_inode;
246
247 mutex_lock(&sysfs_mutex);
248 sysfs_refresh_inode(sd, inode);
249 mutex_unlock(&sysfs_mutex);
250
251 generic_fillattr(inode, stat);
252 return 0;
253}
254
255static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
256{
257 kernfs_get(sd);
258 inode->i_private = sd;
259 inode->i_mapping->a_ops = &sysfs_aops;
260 inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
261 inode->i_op = &sysfs_inode_operations;
262
263 set_default_inode_attr(inode, sd->s_mode);
264 sysfs_refresh_inode(sd, inode);
265
266 /* initialize inode according to type */
267 switch (sysfs_type(sd)) {
268 case SYSFS_DIR:
269 inode->i_op = &sysfs_dir_inode_operations;
270 inode->i_fop = &sysfs_dir_operations;
271 break;
272 case SYSFS_KOBJ_ATTR:
273 inode->i_size = sd->s_attr.size;
274 inode->i_fop = &kernfs_file_operations;
275 break;
276 case SYSFS_KOBJ_LINK:
277 inode->i_op = &sysfs_symlink_inode_operations;
278 break;
279 default:
280 BUG();
281 }
282
283 unlock_new_inode(inode);
284}
285
286/**
287 * sysfs_get_inode - get inode for sysfs_dirent
288 * @sb: super block
289 * @sd: sysfs_dirent to allocate inode for
290 *
291 * Get inode for @sd. If such inode doesn't exist, a new inode
292 * is allocated and basics are initialized. New inode is
293 * returned locked.
294 *
295 * LOCKING:
296 * Kernel thread context (may sleep).
297 *
298 * RETURNS:
299 * Pointer to allocated inode on success, NULL on failure.
300 */
301struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd)
302{
303 struct inode *inode;
304
305 inode = iget_locked(sb, sd->s_ino);
306 if (inode && (inode->i_state & I_NEW))
307 sysfs_init_inode(sd, inode);
308
309 return inode;
310}
311
312/*
313 * The sysfs_dirent serves as both an inode and a directory entry for sysfs.
314 * To prevent the sysfs inode numbers from being freed prematurely we take a
315 * reference to sysfs_dirent from the sysfs inode. A
316 * super_operations.evict_inode() implementation is needed to drop that
317 * reference upon inode destruction.
318 */
319void sysfs_evict_inode(struct inode *inode)
320{
321 struct sysfs_dirent *sd = inode->i_private;
322
323 truncate_inode_pages(&inode->i_data, 0);
324 clear_inode(inode);
325 kernfs_put(sd);
326}
327
328int sysfs_permission(struct inode *inode, int mask)
329{
330 struct sysfs_dirent *sd;
331
332 if (mask & MAY_NOT_BLOCK)
333 return -ECHILD;
334
335 sd = inode->i_private;
336
337 mutex_lock(&sysfs_mutex);
338 sysfs_refresh_inode(sd, inode);
339 mutex_unlock(&sysfs_mutex);
340
341 return generic_permission(inode, mask);
342}
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-05 15:20:45 -0500