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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 16:40:20 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-12 16:40:20 -0400
commitdc690d8ef842b464f1c429a376ca16cb8dbee6ae (patch)
tree77955849af5a15755f5e55e24ae4b9c520583a72 /fs/sysfs/inode.c
parent57399ec9077a4b962b81037aaa279fab52f5e989 (diff)
parent91a6902958f052358899f58683d44e36228d85c2 (diff)
Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6
* master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6: (61 commits) sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes sysfs: make directory dentries and inodes reclaimable sysfs: implement sysfs_get_dentry() sysfs: move sysfs_drop_dentry() to dir.c and make it static sysfs: restructure add/remove paths and fix inode update sysfs: use sysfs_mutex to protect the sysfs_dirent tree sysfs: consolidate sysfs spinlocks sysfs: make kobj point to sysfs_dirent instead of dentry sysfs: implement sysfs_find_dirent() and sysfs_get_dirent() sysfs: implement SYSFS_FLAG_REMOVED flag sysfs: rename sysfs_dirent->s_type to s_flags and make room for flags sysfs: make sysfs_drop_dentry() access inodes using ilookup() sysfs: Fix oops in sysfs_drop_dentry on x86_64 sysfs: use singly-linked list for sysfs_dirent tree sysfs: slim down sysfs_dirent->s_active sysfs: move s_active functions to fs/sysfs/dir.c sysfs: fix root sysfs_dirent -> root dentry association sysfs: use iget_locked() instead of new_inode() sysfs: reorganize sysfs_new_indoe() and sysfs_create() sysfs: fix parent refcounting during rename and move ...
Diffstat (limited to 'fs/sysfs/inode.c')
-rw-r--r--fs/sysfs/inode.c221
1 files changed, 64 insertions, 157 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 5266eec15f6e..3756e152285a 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -133,187 +133,94 @@ static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
133 */ 133 */
134static struct lock_class_key sysfs_inode_imutex_key; 134static struct lock_class_key sysfs_inode_imutex_key;
135 135
136struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent * sd) 136void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
137{ 137{
138 struct inode * inode = new_inode(sysfs_sb); 138 inode->i_blocks = 0;
139 if (inode) { 139 inode->i_mapping->a_ops = &sysfs_aops;
140 inode->i_blocks = 0; 140 inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
141 inode->i_mapping->a_ops = &sysfs_aops; 141 inode->i_op = &sysfs_inode_operations;
142 inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info; 142 inode->i_ino = sd->s_ino;
143 inode->i_op = &sysfs_inode_operations; 143 lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
144 inode->i_ino = sd->s_ino; 144
145 lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key); 145 if (sd->s_iattr) {
146 146 /* sysfs_dirent has non-default attributes
147 if (sd->s_iattr) { 147 * get them for the new inode from persistent copy
148 /* sysfs_dirent has non-default attributes 148 * in sysfs_dirent
149 * get them for the new inode from persistent copy 149 */
150 * in sysfs_dirent 150 set_inode_attr(inode, sd->s_iattr);
151 */
152 set_inode_attr(inode, sd->s_iattr);
153 } else
154 set_default_inode_attr(inode, mode);
155 }
156 return inode;
157}
158
159int sysfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
160{
161 int error = 0;
162 struct inode * inode = NULL;
163 if (dentry) {
164 if (!dentry->d_inode) {
165 struct sysfs_dirent * sd = dentry->d_fsdata;
166 if ((inode = sysfs_new_inode(mode, sd))) {
167 if (dentry->d_parent && dentry->d_parent->d_inode) {
168 struct inode *p_inode = dentry->d_parent->d_inode;
169 p_inode->i_mtime = p_inode->i_ctime = CURRENT_TIME;
170 }
171 goto Proceed;
172 }
173 else
174 error = -ENOMEM;
175 } else
176 error = -EEXIST;
177 } else
178 error = -ENOENT;
179 goto Done;
180
181 Proceed:
182 if (init)
183 error = init(inode);
184 if (!error) {
185 d_instantiate(dentry, inode);
186 if (S_ISDIR(mode))
187 dget(dentry); /* pin only directory dentry in core */
188 } else 151 } else
189 iput(inode); 152 set_default_inode_attr(inode, sd->s_mode);
190 Done:
191 return error;
192} 153}
193 154
194/* 155/**
195 * Get the name for corresponding element represented by the given sysfs_dirent 156 * sysfs_get_inode - get inode for sysfs_dirent
157 * @sd: sysfs_dirent to allocate inode for
158 *
159 * Get inode for @sd. If such inode doesn't exist, a new inode
160 * is allocated and basics are initialized. New inode is
161 * returned locked.
162 *
163 * LOCKING:
164 * Kernel thread context (may sleep).
165 *
166 * RETURNS:
167 * Pointer to allocated inode on success, NULL on failure.
196 */ 168 */
197const unsigned char * sysfs_get_name(struct sysfs_dirent *sd) 169struct inode * sysfs_get_inode(struct sysfs_dirent *sd)
198{ 170{
199 struct attribute * attr; 171 struct inode *inode;
200 struct bin_attribute * bin_attr;
201 struct sysfs_symlink * sl;
202
203 BUG_ON(!sd || !sd->s_element);
204
205 switch (sd->s_type) {
206 case SYSFS_DIR:
207 /* Always have a dentry so use that */
208 return sd->s_dentry->d_name.name;
209
210 case SYSFS_KOBJ_ATTR:
211 attr = sd->s_element;
212 return attr->name;
213
214 case SYSFS_KOBJ_BIN_ATTR:
215 bin_attr = sd->s_element;
216 return bin_attr->attr.name;
217 172
218 case SYSFS_KOBJ_LINK: 173 inode = iget_locked(sysfs_sb, sd->s_ino);
219 sl = sd->s_element; 174 if (inode && (inode->i_state & I_NEW))
220 return sl->link_name; 175 sysfs_init_inode(sd, inode);
221 }
222 return NULL;
223}
224 176
225static inline void orphan_all_buffers(struct inode *node) 177 return inode;
226{
227 struct sysfs_buffer_collection *set;
228 struct sysfs_buffer *buf;
229
230 mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD);
231 set = node->i_private;
232 if (set) {
233 list_for_each_entry(buf, &set->associates, associates) {
234 down(&buf->sem);
235 buf->orphaned = 1;
236 up(&buf->sem);
237 }
238 }
239 mutex_unlock(&node->i_mutex);
240} 178}
241 179
242 180/**
243/* 181 * sysfs_instantiate - instantiate dentry
244 * Unhashes the dentry corresponding to given sysfs_dirent 182 * @dentry: dentry to be instantiated
245 * Called with parent inode's i_mutex held. 183 * @inode: inode associated with @sd
184 *
185 * Unlock @inode if locked and instantiate @dentry with @inode.
186 *
187 * LOCKING:
188 * None.
246 */ 189 */
247void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent) 190void sysfs_instantiate(struct dentry *dentry, struct inode *inode)
248{ 191{
249 struct dentry *dentry = NULL; 192 BUG_ON(!dentry || dentry->d_inode);
250 struct inode *inode;
251 193
252 /* We're not holding a reference to ->s_dentry dentry but the 194 if (inode->i_state & I_NEW)
253 * field will stay valid as long as sysfs_lock is held. 195 unlock_new_inode(inode);
254 */
255 spin_lock(&sysfs_lock);
256 spin_lock(&dcache_lock);
257
258 /* dget dentry if it's still alive */
259 if (sd->s_dentry && sd->s_dentry->d_inode)
260 dentry = dget_locked(sd->s_dentry);
261
262 spin_unlock(&dcache_lock);
263 spin_unlock(&sysfs_lock);
264
265 /* drop dentry */
266 if (dentry) {
267 spin_lock(&dcache_lock);
268 spin_lock(&dentry->d_lock);
269 if (!d_unhashed(dentry) && dentry->d_inode) {
270 inode = dentry->d_inode;
271 spin_lock(&inode->i_lock);
272 __iget(inode);
273 spin_unlock(&inode->i_lock);
274 dget_locked(dentry);
275 __d_drop(dentry);
276 spin_unlock(&dentry->d_lock);
277 spin_unlock(&dcache_lock);
278 simple_unlink(parent->d_inode, dentry);
279 orphan_all_buffers(inode);
280 iput(inode);
281 } else {
282 spin_unlock(&dentry->d_lock);
283 spin_unlock(&dcache_lock);
284 }
285 196
286 dput(dentry); 197 d_instantiate(dentry, inode);
287 }
288} 198}
289 199
290int sysfs_hash_and_remove(struct dentry * dir, const char * name) 200int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
291{ 201{
292 struct sysfs_dirent * sd; 202 struct sysfs_addrm_cxt acxt;
293 struct sysfs_dirent * parent_sd; 203 struct sysfs_dirent **pos, *sd;
294 int found = 0;
295 204
296 if (!dir) 205 if (!dir_sd)
297 return -ENOENT; 206 return -ENOENT;
298 207
299 if (dir->d_inode == NULL) 208 sysfs_addrm_start(&acxt, dir_sd);
300 /* no inode means this hasn't been made visible yet */ 209
301 return -ENOENT; 210 for (pos = &dir_sd->s_children; *pos; pos = &(*pos)->s_sibling) {
211 sd = *pos;
302 212
303 parent_sd = dir->d_fsdata; 213 if (!sysfs_type(sd))
304 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
305 list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
306 if (!sd->s_element)
307 continue; 214 continue;
308 if (!strcmp(sysfs_get_name(sd), name)) { 215 if (!strcmp(sd->s_name, name)) {
309 list_del_init(&sd->s_sibling); 216 *pos = sd->s_sibling;
310 sysfs_drop_dentry(sd, dir); 217 sd->s_sibling = NULL;
311 sysfs_put(sd); 218 sysfs_remove_one(&acxt, sd);
312 found = 1;
313 break; 219 break;
314 } 220 }
315 } 221 }
316 mutex_unlock(&dir->d_inode->i_mutex);
317 222
318 return found ? 0 : -ENOENT; 223 if (sysfs_addrm_finish(&acxt))
224 return 0;
225 return -ENOENT;
319} 226}