Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Tejun Heo | 6d66f5c | 2007-09-20 17:31:38 +0900 | [diff] [blame] | 2 | * fs/sysfs/dir.c - sysfs core and dir operation 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | #undef DEBUG |
| 14 | |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/mount.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kobject.h> |
Christoph Hellwig | 5f45f1a | 2005-06-23 00:09:12 -0700 | [diff] [blame] | 19 | #include <linux/namei.h> |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 20 | #include <linux/idr.h> |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 21 | #include <linux/completion.h> |
Dave Young | 869512a | 2007-07-26 14:53:53 +0000 | [diff] [blame] | 22 | #include <linux/mutex.h> |
Robert P. J. Day | c6f8773 | 2008-03-13 22:41:52 -0400 | [diff] [blame] | 23 | #include <linux/slab.h> |
Eric W. Biederman | 4c3da22 | 2009-11-04 02:50:06 -0800 | [diff] [blame] | 24 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "sysfs.h" |
| 26 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 27 | DEFINE_MUTEX(sysfs_mutex); |
Roel Kluin | f7a75f0 | 2007-10-16 23:30:25 -0700 | [diff] [blame] | 28 | DEFINE_SPINLOCK(sysfs_assoc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Roel Kluin | f7a75f0 | 2007-10-16 23:30:25 -0700 | [diff] [blame] | 30 | static DEFINE_SPINLOCK(sysfs_ino_lock); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 31 | static DEFINE_IDA(sysfs_ino_ida); |
| 32 | |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 33 | /** |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 34 | * sysfs_link_sibling - link sysfs_dirent into sibling list |
| 35 | * @sd: sysfs_dirent of interest |
| 36 | * |
| 37 | * Link @sd into its sibling list which starts from |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 38 | * sd->s_parent->s_dir.children. |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 39 | * |
| 40 | * Locking: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 41 | * mutex_lock(sysfs_mutex) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 42 | */ |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 43 | static void sysfs_link_sibling(struct sysfs_dirent *sd) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 44 | { |
| 45 | struct sysfs_dirent *parent_sd = sd->s_parent; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 46 | struct sysfs_dirent **pos; |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 47 | |
| 48 | BUG_ON(sd->s_sibling); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 49 | |
| 50 | /* Store directory entries in order by ino. This allows |
| 51 | * readdir to properly restart without having to add a |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 52 | * cursor into the s_dir.children list. |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 53 | */ |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 54 | for (pos = &parent_sd->s_dir.children; *pos; pos = &(*pos)->s_sibling) { |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 55 | if (sd->s_ino < (*pos)->s_ino) |
| 56 | break; |
| 57 | } |
| 58 | sd->s_sibling = *pos; |
| 59 | *pos = sd; |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | /** |
| 63 | * sysfs_unlink_sibling - unlink sysfs_dirent from sibling list |
| 64 | * @sd: sysfs_dirent of interest |
| 65 | * |
| 66 | * Unlink @sd from its sibling list which starts from |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 67 | * sd->s_parent->s_dir.children. |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 68 | * |
| 69 | * Locking: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 70 | * mutex_lock(sysfs_mutex) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 71 | */ |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 72 | static void sysfs_unlink_sibling(struct sysfs_dirent *sd) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 73 | { |
| 74 | struct sysfs_dirent **pos; |
| 75 | |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 76 | for (pos = &sd->s_parent->s_dir.children; *pos; |
| 77 | pos = &(*pos)->s_sibling) { |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 78 | if (*pos == sd) { |
| 79 | *pos = sd->s_sibling; |
| 80 | sd->s_sibling = NULL; |
| 81 | break; |
| 82 | } |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | /** |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 87 | * sysfs_get_active - get an active reference to sysfs_dirent |
| 88 | * @sd: sysfs_dirent to get an active reference to |
| 89 | * |
| 90 | * Get an active reference of @sd. This function is noop if @sd |
| 91 | * is NULL. |
| 92 | * |
| 93 | * RETURNS: |
| 94 | * Pointer to @sd on success, NULL on failure. |
| 95 | */ |
Eric W. Biederman | e72ceb8 | 2010-02-11 15:18:38 -0800 | [diff] [blame^] | 96 | struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 97 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 98 | if (unlikely(!sd)) |
| 99 | return NULL; |
| 100 | |
| 101 | while (1) { |
| 102 | int v, t; |
| 103 | |
| 104 | v = atomic_read(&sd->s_active); |
| 105 | if (unlikely(v < 0)) |
| 106 | return NULL; |
| 107 | |
| 108 | t = atomic_cmpxchg(&sd->s_active, v, v + 1); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 109 | if (likely(t == v)) { |
| 110 | rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 111 | return sd; |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 112 | } |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 113 | if (t < 0) |
| 114 | return NULL; |
| 115 | |
| 116 | cpu_relax(); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 117 | } |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | /** |
| 121 | * sysfs_put_active - put an active reference to sysfs_dirent |
| 122 | * @sd: sysfs_dirent to put an active reference to |
| 123 | * |
| 124 | * Put an active reference to @sd. This function is noop if @sd |
| 125 | * is NULL. |
| 126 | */ |
Eric W. Biederman | e72ceb8 | 2010-02-11 15:18:38 -0800 | [diff] [blame^] | 127 | void sysfs_put_active(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 128 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 129 | struct completion *cmpl; |
| 130 | int v; |
| 131 | |
| 132 | if (unlikely(!sd)) |
| 133 | return; |
| 134 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 135 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 136 | v = atomic_dec_return(&sd->s_active); |
| 137 | if (likely(v != SD_DEACTIVATED_BIAS)) |
| 138 | return; |
| 139 | |
| 140 | /* atomic_dec_return() is a mb(), we'll always see the updated |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 141 | * sd->s_sibling. |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 142 | */ |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 143 | cmpl = (void *)sd->s_sibling; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 144 | complete(cmpl); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | /** |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 148 | * sysfs_deactivate - deactivate sysfs_dirent |
| 149 | * @sd: sysfs_dirent to deactivate |
| 150 | * |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 151 | * Deny new active references and drain existing ones. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 152 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 153 | static void sysfs_deactivate(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 154 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 155 | DECLARE_COMPLETION_ONSTACK(wait); |
| 156 | int v; |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 157 | |
Tejun Heo | 380e6fb | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 158 | BUG_ON(sd->s_sibling || !(sd->s_flags & SYSFS_FLAG_REMOVED)); |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 159 | sd->s_sibling = (void *)&wait; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 160 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 161 | rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 162 | /* atomic_add_return() is a mb(), put_active() will always see |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 163 | * the updated sd->s_sibling. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 164 | */ |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 165 | v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active); |
| 166 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 167 | if (v != SD_DEACTIVATED_BIAS) { |
| 168 | lock_contended(&sd->dep_map, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 169 | wait_for_completion(&wait); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 170 | } |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 171 | |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 172 | sd->s_sibling = NULL; |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 173 | |
| 174 | lock_acquired(&sd->dep_map, _RET_IP_); |
| 175 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 176 | } |
| 177 | |
Tejun Heo | 42b37df | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 178 | static int sysfs_alloc_ino(ino_t *pino) |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 179 | { |
| 180 | int ino, rc; |
| 181 | |
| 182 | retry: |
| 183 | spin_lock(&sysfs_ino_lock); |
| 184 | rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino); |
| 185 | spin_unlock(&sysfs_ino_lock); |
| 186 | |
| 187 | if (rc == -EAGAIN) { |
| 188 | if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL)) |
| 189 | goto retry; |
| 190 | rc = -ENOMEM; |
| 191 | } |
| 192 | |
| 193 | *pino = ino; |
| 194 | return rc; |
| 195 | } |
| 196 | |
| 197 | static void sysfs_free_ino(ino_t ino) |
| 198 | { |
| 199 | spin_lock(&sysfs_ino_lock); |
| 200 | ida_remove(&sysfs_ino_ida, ino); |
| 201 | spin_unlock(&sysfs_ino_lock); |
| 202 | } |
| 203 | |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 204 | void release_sysfs_dirent(struct sysfs_dirent * sd) |
| 205 | { |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 206 | struct sysfs_dirent *parent_sd; |
| 207 | |
| 208 | repeat: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 209 | /* Moving/renaming is always done while holding reference. |
| 210 | * sd->s_parent won't change beneath us. |
| 211 | */ |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 212 | parent_sd = sd->s_parent; |
| 213 | |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 214 | if (sysfs_type(sd) == SYSFS_KOBJ_LINK) |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 215 | sysfs_put(sd->s_symlink.target_sd); |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 216 | if (sysfs_type(sd) & SYSFS_COPY_NAME) |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 217 | kfree(sd->s_name); |
Eric W. Biederman | 4c3da22 | 2009-11-04 02:50:06 -0800 | [diff] [blame] | 218 | if (sd->s_iattr && sd->s_iattr->ia_secdata) |
| 219 | security_release_secctx(sd->s_iattr->ia_secdata, |
| 220 | sd->s_iattr->ia_secdata_len); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 221 | kfree(sd->s_iattr); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 222 | sysfs_free_ino(sd->s_ino); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 223 | kmem_cache_free(sysfs_dir_cachep, sd); |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 224 | |
| 225 | sd = parent_sd; |
| 226 | if (sd && atomic_dec_and_test(&sd->s_count)) |
| 227 | goto repeat; |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 228 | } |
| 229 | |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 230 | static int sysfs_dentry_delete(struct dentry *dentry) |
| 231 | { |
| 232 | struct sysfs_dirent *sd = dentry->d_fsdata; |
| 233 | return !!(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 234 | } |
| 235 | |
| 236 | static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 237 | { |
| 238 | struct sysfs_dirent *sd = dentry->d_fsdata; |
| 239 | int is_dir; |
| 240 | |
| 241 | mutex_lock(&sysfs_mutex); |
| 242 | |
| 243 | /* The sysfs dirent has been deleted */ |
| 244 | if (sd->s_flags & SYSFS_FLAG_REMOVED) |
| 245 | goto out_bad; |
| 246 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 247 | /* The sysfs dirent has been moved? */ |
| 248 | if (dentry->d_parent->d_fsdata != sd->s_parent) |
| 249 | goto out_bad; |
| 250 | |
| 251 | /* The sysfs dirent has been renamed */ |
| 252 | if (strcmp(dentry->d_name.name, sd->s_name) != 0) |
| 253 | goto out_bad; |
| 254 | |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 255 | mutex_unlock(&sysfs_mutex); |
| 256 | out_valid: |
| 257 | return 1; |
| 258 | out_bad: |
| 259 | /* Remove the dentry from the dcache hashes. |
| 260 | * If this is a deleted dentry we use d_drop instead of d_delete |
| 261 | * so sysfs doesn't need to cope with negative dentries. |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 262 | * |
| 263 | * If this is a dentry that has simply been renamed we |
| 264 | * use d_drop to remove it from the dcache lookup on its |
| 265 | * old parent. If this dentry persists later when a lookup |
| 266 | * is performed at its new name the dentry will be readded |
| 267 | * to the dcache hashes. |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 268 | */ |
| 269 | is_dir = (sysfs_type(sd) == SYSFS_DIR); |
| 270 | mutex_unlock(&sysfs_mutex); |
| 271 | if (is_dir) { |
| 272 | /* If we have submounts we must allow the vfs caches |
| 273 | * to lie about the state of the filesystem to prevent |
| 274 | * leaks and other nasty things. |
| 275 | */ |
| 276 | if (have_submounts(dentry)) |
| 277 | goto out_valid; |
| 278 | shrink_dcache_parent(dentry); |
| 279 | } |
| 280 | d_drop(dentry); |
| 281 | return 0; |
| 282 | } |
| 283 | |
Eric W. Biederman | 28a027c | 2009-11-07 23:27:00 -0800 | [diff] [blame] | 284 | static void sysfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | { |
| 286 | struct sysfs_dirent * sd = dentry->d_fsdata; |
| 287 | |
Eric W. Biederman | 5a26b79 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 288 | sysfs_put(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | iput(inode); |
| 290 | } |
| 291 | |
Al Viro | ee1ec32 | 2009-02-20 06:01:46 +0000 | [diff] [blame] | 292 | static const struct dentry_operations sysfs_dentry_ops = { |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 293 | .d_revalidate = sysfs_dentry_revalidate, |
| 294 | .d_delete = sysfs_dentry_delete, |
Eric W. Biederman | 28a027c | 2009-11-07 23:27:00 -0800 | [diff] [blame] | 295 | .d_iput = sysfs_dentry_iput, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | }; |
| 297 | |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 298 | struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 300 | char *dup_name = NULL; |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 301 | struct sysfs_dirent *sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 302 | |
| 303 | if (type & SYSFS_COPY_NAME) { |
| 304 | name = dup_name = kstrdup(name, GFP_KERNEL); |
| 305 | if (!name) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 306 | return NULL; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 307 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 309 | sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | if (!sd) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 311 | goto err_out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 313 | if (sysfs_alloc_ino(&sd->s_ino)) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 314 | goto err_out2; |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | atomic_set(&sd->s_count, 1); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 317 | atomic_set(&sd->s_active, 0); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 318 | sysfs_dirent_init_lockdep(sd); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 319 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 320 | sd->s_name = name; |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 321 | sd->s_mode = mode; |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 322 | sd->s_flags = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | return sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 325 | |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 326 | err_out2: |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 327 | kmem_cache_free(sysfs_dir_cachep, sd); |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 328 | err_out1: |
| 329 | kfree(dup_name); |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 330 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
| 332 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 333 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 334 | * sysfs_addrm_start - prepare for sysfs_dirent add/remove |
| 335 | * @acxt: pointer to sysfs_addrm_cxt to be used |
| 336 | * @parent_sd: parent sysfs_dirent |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 337 | * |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 338 | * This function is called when the caller is about to add or |
| 339 | * remove sysfs_dirent under @parent_sd. This function acquires |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 340 | * sysfs_mutex. @acxt is used to keep and pass context to |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 341 | * other addrm functions. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 342 | * |
| 343 | * LOCKING: |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 344 | * Kernel thread context (may sleep). sysfs_mutex is locked on |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 345 | * return. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 346 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 347 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
| 348 | struct sysfs_dirent *parent_sd) |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 349 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 350 | memset(acxt, 0, sizeof(*acxt)); |
| 351 | acxt->parent_sd = parent_sd; |
| 352 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 353 | mutex_lock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | /** |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 357 | * __sysfs_add_one - add sysfs_dirent to parent without warning |
| 358 | * @acxt: addrm context to use |
| 359 | * @sd: sysfs_dirent to be added |
| 360 | * |
| 361 | * Get @acxt->parent_sd and set sd->s_parent to it and increment |
| 362 | * nlink of parent inode if @sd is a directory and link into the |
| 363 | * children list of the parent. |
| 364 | * |
| 365 | * This function should be called between calls to |
| 366 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 367 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 368 | * |
| 369 | * LOCKING: |
| 370 | * Determined by sysfs_addrm_start(). |
| 371 | * |
| 372 | * RETURNS: |
| 373 | * 0 on success, -EEXIST if entry with the given name already |
| 374 | * exists. |
| 375 | */ |
| 376 | int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 377 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 378 | struct sysfs_inode_attrs *ps_iattr; |
| 379 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 380 | if (sysfs_find_dirent(acxt->parent_sd, sd->s_name)) |
| 381 | return -EEXIST; |
| 382 | |
| 383 | sd->s_parent = sysfs_get(acxt->parent_sd); |
| 384 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 385 | sysfs_link_sibling(sd); |
| 386 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 387 | /* Update timestamps on the parent */ |
| 388 | ps_iattr = acxt->parent_sd->s_iattr; |
| 389 | if (ps_iattr) { |
| 390 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 391 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 392 | } |
| 393 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | /** |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 398 | * sysfs_pathname - return full path to sysfs dirent |
| 399 | * @sd: sysfs_dirent whose path we want |
| 400 | * @path: caller allocated buffer |
| 401 | * |
| 402 | * Gives the name "/" to the sysfs_root entry; any path returned |
| 403 | * is relative to wherever sysfs is mounted. |
| 404 | * |
| 405 | * XXX: does no error checking on @path size |
| 406 | */ |
| 407 | static char *sysfs_pathname(struct sysfs_dirent *sd, char *path) |
| 408 | { |
| 409 | if (sd->s_parent) { |
| 410 | sysfs_pathname(sd->s_parent, path); |
| 411 | strcat(path, "/"); |
| 412 | } |
| 413 | strcat(path, sd->s_name); |
| 414 | return path; |
| 415 | } |
| 416 | |
| 417 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 418 | * sysfs_add_one - add sysfs_dirent to parent |
| 419 | * @acxt: addrm context to use |
| 420 | * @sd: sysfs_dirent to be added |
| 421 | * |
| 422 | * Get @acxt->parent_sd and set sd->s_parent to it and increment |
Tejun Heo | 181b2e4 | 2007-09-20 16:05:09 +0900 | [diff] [blame] | 423 | * nlink of parent inode if @sd is a directory and link into the |
| 424 | * children list of the parent. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 425 | * |
| 426 | * This function should be called between calls to |
| 427 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 428 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 429 | * |
| 430 | * LOCKING: |
| 431 | * Determined by sysfs_addrm_start(). |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 432 | * |
| 433 | * RETURNS: |
| 434 | * 0 on success, -EEXIST if entry with the given name already |
| 435 | * exists. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 436 | */ |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 437 | int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 438 | { |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 439 | int ret; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 440 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 441 | ret = __sysfs_add_one(acxt, sd); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 442 | if (ret == -EEXIST) { |
| 443 | char *path = kzalloc(PATH_MAX, GFP_KERNEL); |
| 444 | WARN(1, KERN_WARNING |
| 445 | "sysfs: cannot create duplicate filename '%s'\n", |
| 446 | (path == NULL) ? sd->s_name : |
| 447 | strcat(strcat(sysfs_pathname(acxt->parent_sd, path), "/"), |
| 448 | sd->s_name)); |
| 449 | kfree(path); |
| 450 | } |
| 451 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 452 | return ret; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | /** |
| 456 | * sysfs_remove_one - remove sysfs_dirent from parent |
| 457 | * @acxt: addrm context to use |
Jean Delvare | 9fd5b1c | 2008-01-08 18:11:24 +0100 | [diff] [blame] | 458 | * @sd: sysfs_dirent to be removed |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 459 | * |
| 460 | * Mark @sd removed and drop nlink of parent inode if @sd is a |
Tejun Heo | 181b2e4 | 2007-09-20 16:05:09 +0900 | [diff] [blame] | 461 | * directory. @sd is unlinked from the children list. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 462 | * |
| 463 | * This function should be called between calls to |
| 464 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 465 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 466 | * |
| 467 | * LOCKING: |
| 468 | * Determined by sysfs_addrm_start(). |
| 469 | */ |
| 470 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 471 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 472 | struct sysfs_inode_attrs *ps_iattr; |
| 473 | |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 474 | BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 475 | |
| 476 | sysfs_unlink_sibling(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 477 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 478 | /* Update timestamps on the parent */ |
| 479 | ps_iattr = acxt->parent_sd->s_iattr; |
| 480 | if (ps_iattr) { |
| 481 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 482 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 483 | } |
| 484 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 485 | sd->s_flags |= SYSFS_FLAG_REMOVED; |
| 486 | sd->s_sibling = acxt->removed; |
| 487 | acxt->removed = sd; |
Tejun Heo | a0edd7c | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 491 | * sysfs_addrm_finish - finish up sysfs_dirent add/remove |
| 492 | * @acxt: addrm context to finish up |
| 493 | * |
| 494 | * Finish up sysfs_dirent add/remove. Resources acquired by |
| 495 | * sysfs_addrm_start() are released and removed sysfs_dirents are |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 496 | * cleaned up. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 497 | * |
| 498 | * LOCKING: |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 499 | * sysfs_mutex is released. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 500 | */ |
Tejun Heo | 990e53f | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 501 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 502 | { |
| 503 | /* release resources acquired by sysfs_addrm_start() */ |
| 504 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 505 | |
| 506 | /* kill removed sysfs_dirents */ |
| 507 | while (acxt->removed) { |
| 508 | struct sysfs_dirent *sd = acxt->removed; |
| 509 | |
| 510 | acxt->removed = sd->s_sibling; |
| 511 | sd->s_sibling = NULL; |
| 512 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 513 | sysfs_deactivate(sd); |
Eric W. Biederman | e0edd3c | 2009-03-04 11:57:20 -0800 | [diff] [blame] | 514 | unmap_bin_file(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 515 | sysfs_put(sd); |
| 516 | } |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 517 | } |
| 518 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 519 | /** |
| 520 | * sysfs_find_dirent - find sysfs_dirent with the given name |
| 521 | * @parent_sd: sysfs_dirent to search under |
| 522 | * @name: name to look for |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 523 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 524 | * Look for sysfs_dirent with name @name under @parent_sd. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 525 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 526 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 527 | * mutex_lock(sysfs_mutex) |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 528 | * |
| 529 | * RETURNS: |
| 530 | * Pointer to sysfs_dirent if found, NULL if not. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 531 | */ |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 532 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
| 533 | const unsigned char *name) |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 534 | { |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 535 | struct sysfs_dirent *sd; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 536 | |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 537 | for (sd = parent_sd->s_dir.children; sd; sd = sd->s_sibling) |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 538 | if (!strcmp(sd->s_name, name)) |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 539 | return sd; |
| 540 | return NULL; |
| 541 | } |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 542 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 543 | /** |
| 544 | * sysfs_get_dirent - find and get sysfs_dirent with the given name |
| 545 | * @parent_sd: sysfs_dirent to search under |
| 546 | * @name: name to look for |
| 547 | * |
| 548 | * Look for sysfs_dirent with name @name under @parent_sd and get |
| 549 | * it if found. |
| 550 | * |
| 551 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 552 | * Kernel thread context (may sleep). Grabs sysfs_mutex. |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 553 | * |
| 554 | * RETURNS: |
| 555 | * Pointer to sysfs_dirent if found, NULL if not. |
| 556 | */ |
| 557 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
| 558 | const unsigned char *name) |
| 559 | { |
| 560 | struct sysfs_dirent *sd; |
| 561 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 562 | mutex_lock(&sysfs_mutex); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 563 | sd = sysfs_find_dirent(parent_sd, name); |
| 564 | sysfs_get(sd); |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 565 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 566 | |
| 567 | return sd; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 568 | } |
Neil Brown | f1282c8 | 2008-07-16 08:58:04 +1000 | [diff] [blame] | 569 | EXPORT_SYMBOL_GPL(sysfs_get_dirent); |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 570 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 571 | static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd, |
| 572 | const char *name, struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 575 | struct sysfs_addrm_cxt acxt; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 576 | struct sysfs_dirent *sd; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 577 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 579 | /* allocate */ |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 580 | sd = sysfs_new_dirent(name, mode, SYSFS_DIR); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 581 | if (!sd) |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 582 | return -ENOMEM; |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 583 | sd->s_dir.kobj = kobj; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 584 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 585 | /* link in */ |
| 586 | sysfs_addrm_start(&acxt, parent_sd); |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 587 | rc = sysfs_add_one(&acxt, sd); |
| 588 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 589 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 590 | if (rc == 0) |
| 591 | *p_sd = sd; |
| 592 | else |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 593 | sysfs_put(sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 594 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 595 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | } |
| 597 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 598 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| 599 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 601 | return create_dir(kobj, kobj->sd, name, p_sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
| 603 | |
| 604 | /** |
| 605 | * sysfs_create_dir - create a directory for an object. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | * @kobj: object we're creating directory for. |
| 607 | */ |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 608 | int sysfs_create_dir(struct kobject * kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 610 | struct sysfs_dirent *parent_sd, *sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | int error = 0; |
| 612 | |
| 613 | BUG_ON(!kobj); |
| 614 | |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 615 | if (kobj->parent) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 616 | parent_sd = kobj->parent->sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | else |
Eric W. Biederman | 7d0c7d6 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 618 | parent_sd = &sysfs_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 620 | error = create_dir(kobj, parent_sd, kobject_name(kobj), &sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | if (!error) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 622 | kobj->sd = sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | return error; |
| 624 | } |
| 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, |
| 627 | struct nameidata *nd) |
| 628 | { |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 629 | struct dentry *ret = NULL; |
Tejun Heo | a7a0475 | 2007-08-02 21:38:02 +0900 | [diff] [blame] | 630 | struct sysfs_dirent *parent_sd = dentry->d_parent->d_fsdata; |
| 631 | struct sysfs_dirent *sd; |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 632 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 634 | mutex_lock(&sysfs_mutex); |
| 635 | |
Eric W. Biederman | 94777e0 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 636 | sd = sysfs_find_dirent(parent_sd, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 638 | /* no such entry */ |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 639 | if (!sd) { |
| 640 | ret = ERR_PTR(-ENOENT); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 641 | goto out_unlock; |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 642 | } |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 643 | |
| 644 | /* attach dentry and inode */ |
Tejun Heo | 8312a8d | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 645 | inode = sysfs_get_inode(sd); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 646 | if (!inode) { |
| 647 | ret = ERR_PTR(-ENOMEM); |
| 648 | goto out_unlock; |
| 649 | } |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 650 | |
Tejun Heo | d6b4fd2 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 651 | /* instantiate and hash dentry */ |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 652 | ret = d_find_alias(inode); |
| 653 | if (!ret) { |
| 654 | dentry->d_op = &sysfs_dentry_ops; |
| 655 | dentry->d_fsdata = sysfs_get(sd); |
| 656 | d_add(dentry, inode); |
| 657 | } else { |
| 658 | d_move(ret, dentry); |
| 659 | iput(inode); |
| 660 | } |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 661 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 662 | out_unlock: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 663 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 664 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 667 | const struct inode_operations sysfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | .lookup = sysfs_lookup, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 669 | .permission = sysfs_permission, |
Maneesh Soni | 988d186 | 2005-05-31 10:39:14 +0530 | [diff] [blame] | 670 | .setattr = sysfs_setattr, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 671 | .getattr = sysfs_getattr, |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 672 | .setxattr = sysfs_setxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | }; |
| 674 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 675 | static void remove_dir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 677 | struct sysfs_addrm_cxt acxt; |
| 678 | |
| 679 | sysfs_addrm_start(&acxt, sd->s_parent); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 680 | sysfs_remove_one(&acxt, sd); |
| 681 | sysfs_addrm_finish(&acxt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |
| 683 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 684 | void sysfs_remove_subdir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 686 | remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 690 | static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 692 | struct sysfs_addrm_cxt acxt; |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 693 | struct sysfs_dirent **pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 695 | if (!dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | return; |
| 697 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 698 | pr_debug("sysfs %s: removing dir\n", dir_sd->s_name); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 699 | sysfs_addrm_start(&acxt, dir_sd); |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 700 | pos = &dir_sd->s_dir.children; |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 701 | while (*pos) { |
| 702 | struct sysfs_dirent *sd = *pos; |
| 703 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 704 | if (sysfs_type(sd) != SYSFS_DIR) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 705 | sysfs_remove_one(&acxt, sd); |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 706 | else |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 707 | pos = &(*pos)->s_sibling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 709 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 710 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 711 | remove_dir(dir_sd); |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 712 | } |
| 713 | |
| 714 | /** |
| 715 | * sysfs_remove_dir - remove an object's directory. |
| 716 | * @kobj: object. |
| 717 | * |
| 718 | * The only thing special about this is that we remove any files in |
| 719 | * the directory before we remove the directory, and we've inlined |
| 720 | * what used to be sysfs_rmdir() below, instead of calling separately. |
| 721 | */ |
| 722 | |
| 723 | void sysfs_remove_dir(struct kobject * kobj) |
| 724 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 725 | struct sysfs_dirent *sd = kobj->sd; |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 726 | |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 727 | spin_lock(&sysfs_assoc_lock); |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 728 | kobj->sd = NULL; |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 729 | spin_unlock(&sysfs_assoc_lock); |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 730 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 731 | __sysfs_remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 734 | int sysfs_rename(struct sysfs_dirent *sd, |
| 735 | struct sysfs_dirent *new_parent_sd, const char *new_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 737 | const char *dup_name = NULL; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 738 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 740 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 932ea2e | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 741 | |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 742 | error = 0; |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 743 | if ((sd->s_parent == new_parent_sd) && |
| 744 | (strcmp(sd->s_name, new_name) == 0)) |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 745 | goto out; /* nothing to rename */ |
| 746 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 747 | error = -EEXIST; |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 748 | if (sysfs_find_dirent(new_parent_sd, new_name)) |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 749 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 750 | |
Eric W. Biederman | 0b4a4fe | 2008-07-03 18:05:28 -0700 | [diff] [blame] | 751 | /* rename sysfs_dirent */ |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 752 | if (strcmp(sd->s_name, new_name) != 0) { |
| 753 | error = -ENOMEM; |
| 754 | new_name = dup_name = kstrdup(new_name, GFP_KERNEL); |
| 755 | if (!new_name) |
| 756 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 757 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 758 | dup_name = sd->s_name; |
| 759 | sd->s_name = new_name; |
| 760 | } |
| 761 | |
| 762 | /* Remove from old parent's list and insert into new parent's list. */ |
| 763 | if (sd->s_parent != new_parent_sd) { |
| 764 | sysfs_unlink_sibling(sd); |
| 765 | sysfs_get(new_parent_sd); |
| 766 | sysfs_put(sd->s_parent); |
| 767 | sd->s_parent = new_parent_sd; |
| 768 | sysfs_link_sibling(sd); |
| 769 | } |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 770 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 771 | error = 0; |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 772 | out: |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 773 | mutex_unlock(&sysfs_mutex); |
| 774 | kfree(dup_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | return error; |
| 776 | } |
| 777 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 778 | int sysfs_rename_dir(struct kobject *kobj, const char *new_name) |
| 779 | { |
| 780 | return sysfs_rename(kobj->sd, kobj->sd->s_parent, new_name); |
| 781 | } |
| 782 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 783 | int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 784 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 785 | struct sysfs_dirent *sd = kobj->sd; |
| 786 | struct sysfs_dirent *new_parent_sd; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 787 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 788 | BUG_ON(!sd->s_parent); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 789 | new_parent_sd = new_parent_kobj && new_parent_kobj->sd ? |
Cornelia Huck | a6a8357 | 2009-10-06 15:33:35 +0200 | [diff] [blame] | 790 | new_parent_kobj->sd : &sysfs_root; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 791 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 792 | return sysfs_rename(sd, new_parent_sd, sd->s_name); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 793 | } |
| 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | /* Relationship between s_mode and the DT_xxx types */ |
| 796 | static inline unsigned char dt_type(struct sysfs_dirent *sd) |
| 797 | { |
| 798 | return (sd->s_mode >> 12) & 15; |
| 799 | } |
| 800 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 801 | static int sysfs_dir_release(struct inode *inode, struct file *filp) |
| 802 | { |
| 803 | sysfs_put(filp->private_data); |
| 804 | return 0; |
| 805 | } |
| 806 | |
| 807 | static struct sysfs_dirent *sysfs_dir_pos(struct sysfs_dirent *parent_sd, |
| 808 | ino_t ino, struct sysfs_dirent *pos) |
| 809 | { |
| 810 | if (pos) { |
| 811 | int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) && |
| 812 | pos->s_parent == parent_sd && |
| 813 | ino == pos->s_ino; |
| 814 | sysfs_put(pos); |
| 815 | if (valid) |
| 816 | return pos; |
| 817 | } |
| 818 | pos = NULL; |
| 819 | if ((ino > 1) && (ino < INT_MAX)) { |
| 820 | pos = parent_sd->s_dir.children; |
| 821 | while (pos && (ino > pos->s_ino)) |
| 822 | pos = pos->s_sibling; |
| 823 | } |
| 824 | return pos; |
| 825 | } |
| 826 | |
| 827 | static struct sysfs_dirent *sysfs_dir_next_pos(struct sysfs_dirent *parent_sd, |
| 828 | ino_t ino, struct sysfs_dirent *pos) |
| 829 | { |
| 830 | pos = sysfs_dir_pos(parent_sd, ino, pos); |
| 831 | if (pos) |
| 832 | pos = pos->s_sibling; |
| 833 | return pos; |
| 834 | } |
| 835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 837 | { |
Josef "Jeff" Sipek | f427f5d | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 838 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | struct sysfs_dirent * parent_sd = dentry->d_fsdata; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 840 | struct sysfs_dirent *pos = filp->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | ino_t ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 843 | if (filp->f_pos == 0) { |
| 844 | ino = parent_sd->s_ino; |
| 845 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0) |
| 846 | filp->f_pos++; |
| 847 | } |
| 848 | if (filp->f_pos == 1) { |
| 849 | if (parent_sd->s_parent) |
| 850 | ino = parent_sd->s_parent->s_ino; |
| 851 | else |
Eric Sandeen | dc35125 | 2007-06-11 14:02:45 +0900 | [diff] [blame] | 852 | ino = parent_sd->s_ino; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 853 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | filp->f_pos++; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 855 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 856 | mutex_lock(&sysfs_mutex); |
| 857 | for (pos = sysfs_dir_pos(parent_sd, filp->f_pos, pos); |
| 858 | pos; |
| 859 | pos = sysfs_dir_next_pos(parent_sd, filp->f_pos, pos)) { |
| 860 | const char * name; |
| 861 | unsigned int type; |
| 862 | int len, ret; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 863 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 864 | name = pos->s_name; |
| 865 | len = strlen(name); |
| 866 | ino = pos->s_ino; |
| 867 | type = dt_type(pos); |
| 868 | filp->f_pos = ino; |
| 869 | filp->private_data = sysfs_get(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 870 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 871 | mutex_unlock(&sysfs_mutex); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 872 | ret = filldir(dirent, name, len, filp->f_pos, ino, type); |
| 873 | mutex_lock(&sysfs_mutex); |
| 874 | if (ret < 0) |
| 875 | break; |
| 876 | } |
| 877 | mutex_unlock(&sysfs_mutex); |
| 878 | if ((filp->f_pos > 1) && !pos) { /* EOF */ |
| 879 | filp->f_pos = INT_MAX; |
| 880 | filp->private_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | } |
| 882 | return 0; |
| 883 | } |
| 884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 886 | const struct file_operations sysfs_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | .read = generic_read_dir, |
| 888 | .readdir = sysfs_readdir, |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 889 | .release = sysfs_dir_release, |
Christoph Hellwig | 3222a3e | 2008-09-03 21:53:01 +0200 | [diff] [blame] | 890 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | }; |