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)); |
Eric W. Biederman | a2db684 | 2010-02-11 15:20:00 -0800 | [diff] [blame] | 159 | |
| 160 | if (!(sysfs_type(sd) & SYSFS_ACTIVE_REF)) |
| 161 | return; |
| 162 | |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 163 | sd->s_sibling = (void *)&wait; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 164 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 165 | rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 166 | /* atomic_add_return() is a mb(), put_active() will always see |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 167 | * the updated sd->s_sibling. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 168 | */ |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 169 | v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active); |
| 170 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 171 | if (v != SD_DEACTIVATED_BIAS) { |
| 172 | lock_contended(&sd->dep_map, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 173 | wait_for_completion(&wait); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 174 | } |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 175 | |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 176 | sd->s_sibling = NULL; |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 177 | |
| 178 | lock_acquired(&sd->dep_map, _RET_IP_); |
| 179 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 180 | } |
| 181 | |
Tejun Heo | 42b37df | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 182 | static int sysfs_alloc_ino(ino_t *pino) |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 183 | { |
| 184 | int ino, rc; |
| 185 | |
| 186 | retry: |
| 187 | spin_lock(&sysfs_ino_lock); |
| 188 | rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino); |
| 189 | spin_unlock(&sysfs_ino_lock); |
| 190 | |
| 191 | if (rc == -EAGAIN) { |
| 192 | if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL)) |
| 193 | goto retry; |
| 194 | rc = -ENOMEM; |
| 195 | } |
| 196 | |
| 197 | *pino = ino; |
| 198 | return rc; |
| 199 | } |
| 200 | |
| 201 | static void sysfs_free_ino(ino_t ino) |
| 202 | { |
| 203 | spin_lock(&sysfs_ino_lock); |
| 204 | ida_remove(&sysfs_ino_ida, ino); |
| 205 | spin_unlock(&sysfs_ino_lock); |
| 206 | } |
| 207 | |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 208 | void release_sysfs_dirent(struct sysfs_dirent * sd) |
| 209 | { |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 210 | struct sysfs_dirent *parent_sd; |
| 211 | |
| 212 | repeat: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 213 | /* Moving/renaming is always done while holding reference. |
| 214 | * sd->s_parent won't change beneath us. |
| 215 | */ |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 216 | parent_sd = sd->s_parent; |
| 217 | |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 218 | if (sysfs_type(sd) == SYSFS_KOBJ_LINK) |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 219 | sysfs_put(sd->s_symlink.target_sd); |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 220 | if (sysfs_type(sd) & SYSFS_COPY_NAME) |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 221 | kfree(sd->s_name); |
Eric W. Biederman | 4c3da22 | 2009-11-04 02:50:06 -0800 | [diff] [blame] | 222 | if (sd->s_iattr && sd->s_iattr->ia_secdata) |
| 223 | security_release_secctx(sd->s_iattr->ia_secdata, |
| 224 | sd->s_iattr->ia_secdata_len); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 225 | kfree(sd->s_iattr); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 226 | sysfs_free_ino(sd->s_ino); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 227 | kmem_cache_free(sysfs_dir_cachep, sd); |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 228 | |
| 229 | sd = parent_sd; |
| 230 | if (sd && atomic_dec_and_test(&sd->s_count)) |
| 231 | goto repeat; |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 232 | } |
| 233 | |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 234 | static int sysfs_dentry_delete(struct dentry *dentry) |
| 235 | { |
| 236 | struct sysfs_dirent *sd = dentry->d_fsdata; |
| 237 | return !!(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 238 | } |
| 239 | |
| 240 | static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 241 | { |
| 242 | struct sysfs_dirent *sd = dentry->d_fsdata; |
| 243 | int is_dir; |
| 244 | |
| 245 | mutex_lock(&sysfs_mutex); |
| 246 | |
| 247 | /* The sysfs dirent has been deleted */ |
| 248 | if (sd->s_flags & SYSFS_FLAG_REMOVED) |
| 249 | goto out_bad; |
| 250 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 251 | /* The sysfs dirent has been moved? */ |
| 252 | if (dentry->d_parent->d_fsdata != sd->s_parent) |
| 253 | goto out_bad; |
| 254 | |
| 255 | /* The sysfs dirent has been renamed */ |
| 256 | if (strcmp(dentry->d_name.name, sd->s_name) != 0) |
| 257 | goto out_bad; |
| 258 | |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 259 | mutex_unlock(&sysfs_mutex); |
| 260 | out_valid: |
| 261 | return 1; |
| 262 | out_bad: |
| 263 | /* Remove the dentry from the dcache hashes. |
| 264 | * If this is a deleted dentry we use d_drop instead of d_delete |
| 265 | * so sysfs doesn't need to cope with negative dentries. |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 266 | * |
| 267 | * If this is a dentry that has simply been renamed we |
| 268 | * use d_drop to remove it from the dcache lookup on its |
| 269 | * old parent. If this dentry persists later when a lookup |
| 270 | * is performed at its new name the dentry will be readded |
| 271 | * to the dcache hashes. |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 272 | */ |
| 273 | is_dir = (sysfs_type(sd) == SYSFS_DIR); |
| 274 | mutex_unlock(&sysfs_mutex); |
| 275 | if (is_dir) { |
| 276 | /* If we have submounts we must allow the vfs caches |
| 277 | * to lie about the state of the filesystem to prevent |
| 278 | * leaks and other nasty things. |
| 279 | */ |
| 280 | if (have_submounts(dentry)) |
| 281 | goto out_valid; |
| 282 | shrink_dcache_parent(dentry); |
| 283 | } |
| 284 | d_drop(dentry); |
| 285 | return 0; |
| 286 | } |
| 287 | |
Eric W. Biederman | 28a027c | 2009-11-07 23:27:00 -0800 | [diff] [blame] | 288 | static void sysfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | { |
| 290 | struct sysfs_dirent * sd = dentry->d_fsdata; |
| 291 | |
Eric W. Biederman | 5a26b79 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 292 | sysfs_put(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | iput(inode); |
| 294 | } |
| 295 | |
Al Viro | ee1ec32 | 2009-02-20 06:01:46 +0000 | [diff] [blame] | 296 | static const struct dentry_operations sysfs_dentry_ops = { |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 297 | .d_revalidate = sysfs_dentry_revalidate, |
| 298 | .d_delete = sysfs_dentry_delete, |
Eric W. Biederman | 28a027c | 2009-11-07 23:27:00 -0800 | [diff] [blame] | 299 | .d_iput = sysfs_dentry_iput, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | }; |
| 301 | |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 302 | 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] | 303 | { |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 304 | char *dup_name = NULL; |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 305 | struct sysfs_dirent *sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 306 | |
| 307 | if (type & SYSFS_COPY_NAME) { |
| 308 | name = dup_name = kstrdup(name, GFP_KERNEL); |
| 309 | if (!name) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 310 | return NULL; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 311 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 313 | sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | if (!sd) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 315 | goto err_out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 317 | if (sysfs_alloc_ino(&sd->s_ino)) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 318 | goto err_out2; |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | atomic_set(&sd->s_count, 1); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 321 | atomic_set(&sd->s_active, 0); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 322 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 323 | sd->s_name = name; |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 324 | sd->s_mode = mode; |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 325 | sd->s_flags = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | return sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 328 | |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 329 | err_out2: |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 330 | kmem_cache_free(sysfs_dir_cachep, sd); |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 331 | err_out1: |
| 332 | kfree(dup_name); |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 333 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
| 335 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 336 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 337 | * sysfs_addrm_start - prepare for sysfs_dirent add/remove |
| 338 | * @acxt: pointer to sysfs_addrm_cxt to be used |
| 339 | * @parent_sd: parent sysfs_dirent |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 340 | * |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 341 | * This function is called when the caller is about to add or |
| 342 | * remove sysfs_dirent under @parent_sd. This function acquires |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 343 | * sysfs_mutex. @acxt is used to keep and pass context to |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 344 | * other addrm functions. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 345 | * |
| 346 | * LOCKING: |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 347 | * Kernel thread context (may sleep). sysfs_mutex is locked on |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 348 | * return. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 349 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 350 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
| 351 | struct sysfs_dirent *parent_sd) |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 352 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 353 | memset(acxt, 0, sizeof(*acxt)); |
| 354 | acxt->parent_sd = parent_sd; |
| 355 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 356 | mutex_lock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | /** |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 360 | * __sysfs_add_one - add sysfs_dirent to parent without warning |
| 361 | * @acxt: addrm context to use |
| 362 | * @sd: sysfs_dirent to be added |
| 363 | * |
| 364 | * Get @acxt->parent_sd and set sd->s_parent to it and increment |
| 365 | * nlink of parent inode if @sd is a directory and link into the |
| 366 | * children list of the parent. |
| 367 | * |
| 368 | * This function should be called between calls to |
| 369 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 370 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 371 | * |
| 372 | * LOCKING: |
| 373 | * Determined by sysfs_addrm_start(). |
| 374 | * |
| 375 | * RETURNS: |
| 376 | * 0 on success, -EEXIST if entry with the given name already |
| 377 | * exists. |
| 378 | */ |
| 379 | int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 380 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 381 | struct sysfs_inode_attrs *ps_iattr; |
| 382 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 383 | if (sysfs_find_dirent(acxt->parent_sd, sd->s_ns, sd->s_name)) |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 384 | return -EEXIST; |
| 385 | |
| 386 | sd->s_parent = sysfs_get(acxt->parent_sd); |
| 387 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 388 | sysfs_link_sibling(sd); |
| 389 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 390 | /* Update timestamps on the parent */ |
| 391 | ps_iattr = acxt->parent_sd->s_iattr; |
| 392 | if (ps_iattr) { |
| 393 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 394 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 395 | } |
| 396 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | /** |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 401 | * sysfs_pathname - return full path to sysfs dirent |
| 402 | * @sd: sysfs_dirent whose path we want |
| 403 | * @path: caller allocated buffer |
| 404 | * |
| 405 | * Gives the name "/" to the sysfs_root entry; any path returned |
| 406 | * is relative to wherever sysfs is mounted. |
| 407 | * |
| 408 | * XXX: does no error checking on @path size |
| 409 | */ |
| 410 | static char *sysfs_pathname(struct sysfs_dirent *sd, char *path) |
| 411 | { |
| 412 | if (sd->s_parent) { |
| 413 | sysfs_pathname(sd->s_parent, path); |
| 414 | strcat(path, "/"); |
| 415 | } |
| 416 | strcat(path, sd->s_name); |
| 417 | return path; |
| 418 | } |
| 419 | |
| 420 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 421 | * sysfs_add_one - add sysfs_dirent to parent |
| 422 | * @acxt: addrm context to use |
| 423 | * @sd: sysfs_dirent to be added |
| 424 | * |
| 425 | * 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] | 426 | * nlink of parent inode if @sd is a directory and link into the |
| 427 | * children list of the parent. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 428 | * |
| 429 | * This function should be called between calls to |
| 430 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 431 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 432 | * |
| 433 | * LOCKING: |
| 434 | * Determined by sysfs_addrm_start(). |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 435 | * |
| 436 | * RETURNS: |
| 437 | * 0 on success, -EEXIST if entry with the given name already |
| 438 | * exists. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 439 | */ |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 440 | 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] | 441 | { |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 442 | int ret; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 443 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 444 | ret = __sysfs_add_one(acxt, sd); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 445 | if (ret == -EEXIST) { |
| 446 | char *path = kzalloc(PATH_MAX, GFP_KERNEL); |
| 447 | WARN(1, KERN_WARNING |
| 448 | "sysfs: cannot create duplicate filename '%s'\n", |
| 449 | (path == NULL) ? sd->s_name : |
| 450 | strcat(strcat(sysfs_pathname(acxt->parent_sd, path), "/"), |
| 451 | sd->s_name)); |
| 452 | kfree(path); |
| 453 | } |
| 454 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 455 | return ret; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | /** |
| 459 | * sysfs_remove_one - remove sysfs_dirent from parent |
| 460 | * @acxt: addrm context to use |
Jean Delvare | 9fd5b1c | 2008-01-08 18:11:24 +0100 | [diff] [blame] | 461 | * @sd: sysfs_dirent to be removed |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 462 | * |
| 463 | * 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] | 464 | * directory. @sd is unlinked from the children list. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 465 | * |
| 466 | * This function should be called between calls to |
| 467 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 468 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 469 | * |
| 470 | * LOCKING: |
| 471 | * Determined by sysfs_addrm_start(). |
| 472 | */ |
| 473 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 474 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 475 | struct sysfs_inode_attrs *ps_iattr; |
| 476 | |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 477 | BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 478 | |
| 479 | sysfs_unlink_sibling(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 480 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 481 | /* Update timestamps on the parent */ |
| 482 | ps_iattr = acxt->parent_sd->s_iattr; |
| 483 | if (ps_iattr) { |
| 484 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 485 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 486 | } |
| 487 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 488 | sd->s_flags |= SYSFS_FLAG_REMOVED; |
| 489 | sd->s_sibling = acxt->removed; |
| 490 | acxt->removed = sd; |
Tejun Heo | a0edd7c | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 494 | * sysfs_addrm_finish - finish up sysfs_dirent add/remove |
| 495 | * @acxt: addrm context to finish up |
| 496 | * |
| 497 | * Finish up sysfs_dirent add/remove. Resources acquired by |
| 498 | * sysfs_addrm_start() are released and removed sysfs_dirents are |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 499 | * cleaned up. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 500 | * |
| 501 | * LOCKING: |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 502 | * sysfs_mutex is released. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 503 | */ |
Tejun Heo | 990e53f | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 504 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 505 | { |
| 506 | /* release resources acquired by sysfs_addrm_start() */ |
| 507 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 508 | |
| 509 | /* kill removed sysfs_dirents */ |
| 510 | while (acxt->removed) { |
| 511 | struct sysfs_dirent *sd = acxt->removed; |
| 512 | |
| 513 | acxt->removed = sd->s_sibling; |
| 514 | sd->s_sibling = NULL; |
| 515 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 516 | sysfs_deactivate(sd); |
Eric W. Biederman | e0edd3c | 2009-03-04 11:57:20 -0800 | [diff] [blame] | 517 | unmap_bin_file(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 518 | sysfs_put(sd); |
| 519 | } |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 520 | } |
| 521 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 522 | /** |
| 523 | * sysfs_find_dirent - find sysfs_dirent with the given name |
| 524 | * @parent_sd: sysfs_dirent to search under |
| 525 | * @name: name to look for |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 526 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 527 | * Look for sysfs_dirent with name @name under @parent_sd. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 528 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 529 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 530 | * mutex_lock(sysfs_mutex) |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 531 | * |
| 532 | * RETURNS: |
| 533 | * Pointer to sysfs_dirent if found, NULL if not. |
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 *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 536 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 537 | const unsigned char *name) |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 538 | { |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 539 | struct sysfs_dirent *sd; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 540 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 541 | for (sd = parent_sd->s_dir.children; sd; sd = sd->s_sibling) { |
Eric W. Biederman | af10ec7 | 2010-03-30 11:31:27 -0700 | [diff] [blame] | 542 | if (ns && sd->s_ns && (sd->s_ns != ns)) |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 543 | continue; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 544 | if (!strcmp(sd->s_name, name)) |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 545 | return sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 546 | } |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 547 | return NULL; |
| 548 | } |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 549 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 550 | /** |
| 551 | * sysfs_get_dirent - find and get sysfs_dirent with the given name |
| 552 | * @parent_sd: sysfs_dirent to search under |
| 553 | * @name: name to look for |
| 554 | * |
| 555 | * Look for sysfs_dirent with name @name under @parent_sd and get |
| 556 | * it if found. |
| 557 | * |
| 558 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 559 | * Kernel thread context (may sleep). Grabs sysfs_mutex. |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 560 | * |
| 561 | * RETURNS: |
| 562 | * Pointer to sysfs_dirent if found, NULL if not. |
| 563 | */ |
| 564 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 565 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 566 | const unsigned char *name) |
| 567 | { |
| 568 | struct sysfs_dirent *sd; |
| 569 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 570 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 571 | sd = sysfs_find_dirent(parent_sd, ns, name); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 572 | sysfs_get(sd); |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 573 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 574 | |
| 575 | return sd; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 576 | } |
Neil Brown | f1282c8 | 2008-07-16 08:58:04 +1000 | [diff] [blame] | 577 | EXPORT_SYMBOL_GPL(sysfs_get_dirent); |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 578 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 579 | static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 580 | enum kobj_ns_type type, const void *ns, const char *name, |
| 581 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 584 | struct sysfs_addrm_cxt acxt; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 585 | struct sysfs_dirent *sd; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 586 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 588 | /* allocate */ |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 589 | sd = sysfs_new_dirent(name, mode, SYSFS_DIR); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 590 | if (!sd) |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 591 | return -ENOMEM; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 592 | |
| 593 | sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT); |
| 594 | sd->s_ns = ns; |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 595 | sd->s_dir.kobj = kobj; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 596 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 597 | /* link in */ |
| 598 | sysfs_addrm_start(&acxt, parent_sd); |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 599 | rc = sysfs_add_one(&acxt, sd); |
| 600 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 601 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 602 | if (rc == 0) |
| 603 | *p_sd = sd; |
| 604 | else |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 605 | sysfs_put(sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 606 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 607 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 610 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| 611 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 613 | return create_dir(kobj, kobj->sd, |
| 614 | KOBJ_NS_TYPE_NONE, NULL, name, p_sd); |
| 615 | } |
| 616 | |
Serge E. Hallyn | be867b1 | 2010-05-03 16:23:15 -0500 | [diff] [blame^] | 617 | /** |
| 618 | * sysfs_read_ns_type: return associated ns_type |
| 619 | * @kobj: the kobject being queried |
| 620 | * |
| 621 | * Each kobject can be tagged with exactly one namespace type |
| 622 | * (i.e. network or user). Return the ns_type associated with |
| 623 | * this object if any |
| 624 | */ |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 625 | static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj) |
| 626 | { |
| 627 | const struct kobj_ns_type_operations *ops; |
| 628 | enum kobj_ns_type type; |
| 629 | |
| 630 | ops = kobj_child_ns_ops(kobj); |
| 631 | if (!ops) |
| 632 | return KOBJ_NS_TYPE_NONE; |
| 633 | |
| 634 | type = ops->type; |
| 635 | BUG_ON(type <= KOBJ_NS_TYPE_NONE); |
| 636 | BUG_ON(type >= KOBJ_NS_TYPES); |
| 637 | BUG_ON(!kobj_ns_type_registered(type)); |
| 638 | |
| 639 | return type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | /** |
| 643 | * sysfs_create_dir - create a directory for an object. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | * @kobj: object we're creating directory for. |
| 645 | */ |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 646 | int sysfs_create_dir(struct kobject * kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 648 | enum kobj_ns_type type; |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 649 | struct sysfs_dirent *parent_sd, *sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 650 | const void *ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | int error = 0; |
| 652 | |
| 653 | BUG_ON(!kobj); |
| 654 | |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 655 | if (kobj->parent) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 656 | parent_sd = kobj->parent->sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | else |
Eric W. Biederman | 7d0c7d6 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 658 | parent_sd = &sysfs_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 660 | if (sysfs_ns_type(parent_sd)) |
| 661 | ns = kobj->ktype->namespace(kobj); |
| 662 | type = sysfs_read_ns_type(kobj); |
| 663 | |
| 664 | error = create_dir(kobj, parent_sd, type, ns, kobject_name(kobj), &sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | if (!error) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 666 | kobj->sd = sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return error; |
| 668 | } |
| 669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, |
| 671 | struct nameidata *nd) |
| 672 | { |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 673 | struct dentry *ret = NULL; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 674 | struct dentry *parent = dentry->d_parent; |
| 675 | struct sysfs_dirent *parent_sd = parent->d_fsdata; |
Tejun Heo | a7a0475 | 2007-08-02 21:38:02 +0900 | [diff] [blame] | 676 | struct sysfs_dirent *sd; |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 677 | struct inode *inode; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 678 | enum kobj_ns_type type; |
| 679 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 681 | mutex_lock(&sysfs_mutex); |
| 682 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 683 | type = sysfs_ns_type(parent_sd); |
| 684 | ns = sysfs_info(dir->i_sb)->ns[type]; |
| 685 | |
| 686 | sd = sysfs_find_dirent(parent_sd, ns, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 688 | /* no such entry */ |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 689 | if (!sd) { |
| 690 | ret = ERR_PTR(-ENOENT); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 691 | goto out_unlock; |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 692 | } |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 693 | |
| 694 | /* attach dentry and inode */ |
Eric W. Biederman | fac2622 | 2010-02-12 19:22:27 -0800 | [diff] [blame] | 695 | inode = sysfs_get_inode(dir->i_sb, sd); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 696 | if (!inode) { |
| 697 | ret = ERR_PTR(-ENOMEM); |
| 698 | goto out_unlock; |
| 699 | } |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 700 | |
Tejun Heo | d6b4fd2 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 701 | /* instantiate and hash dentry */ |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 702 | ret = d_find_alias(inode); |
| 703 | if (!ret) { |
| 704 | dentry->d_op = &sysfs_dentry_ops; |
| 705 | dentry->d_fsdata = sysfs_get(sd); |
| 706 | d_add(dentry, inode); |
| 707 | } else { |
| 708 | d_move(ret, dentry); |
| 709 | iput(inode); |
| 710 | } |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 711 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 712 | out_unlock: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 713 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 714 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
| 716 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 717 | const struct inode_operations sysfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | .lookup = sysfs_lookup, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 719 | .permission = sysfs_permission, |
Maneesh Soni | 988d186 | 2005-05-31 10:39:14 +0530 | [diff] [blame] | 720 | .setattr = sysfs_setattr, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 721 | .getattr = sysfs_getattr, |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 722 | .setxattr = sysfs_setxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | }; |
| 724 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 725 | static void remove_dir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 727 | struct sysfs_addrm_cxt acxt; |
| 728 | |
| 729 | sysfs_addrm_start(&acxt, sd->s_parent); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 730 | sysfs_remove_one(&acxt, sd); |
| 731 | sysfs_addrm_finish(&acxt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 734 | void sysfs_remove_subdir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 736 | remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 740 | static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 742 | struct sysfs_addrm_cxt acxt; |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 743 | struct sysfs_dirent **pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 745 | if (!dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | return; |
| 747 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 748 | pr_debug("sysfs %s: removing dir\n", dir_sd->s_name); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 749 | sysfs_addrm_start(&acxt, dir_sd); |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 750 | pos = &dir_sd->s_dir.children; |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 751 | while (*pos) { |
| 752 | struct sysfs_dirent *sd = *pos; |
| 753 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 754 | if (sysfs_type(sd) != SYSFS_DIR) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 755 | sysfs_remove_one(&acxt, sd); |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 756 | else |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 757 | pos = &(*pos)->s_sibling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 759 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 760 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 761 | remove_dir(dir_sd); |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | /** |
| 765 | * sysfs_remove_dir - remove an object's directory. |
| 766 | * @kobj: object. |
| 767 | * |
| 768 | * The only thing special about this is that we remove any files in |
| 769 | * the directory before we remove the directory, and we've inlined |
| 770 | * what used to be sysfs_rmdir() below, instead of calling separately. |
| 771 | */ |
| 772 | |
| 773 | void sysfs_remove_dir(struct kobject * kobj) |
| 774 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 775 | struct sysfs_dirent *sd = kobj->sd; |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 776 | |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 777 | spin_lock(&sysfs_assoc_lock); |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 778 | kobj->sd = NULL; |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 779 | spin_unlock(&sysfs_assoc_lock); |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 780 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 781 | __sysfs_remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 784 | int sysfs_rename(struct sysfs_dirent *sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 785 | struct sysfs_dirent *new_parent_sd, const void *new_ns, |
| 786 | const char *new_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 788 | const char *dup_name = NULL; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 789 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 791 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 932ea2e | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 792 | |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 793 | error = 0; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 794 | if ((sd->s_parent == new_parent_sd) && (sd->s_ns == new_ns) && |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 795 | (strcmp(sd->s_name, new_name) == 0)) |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 796 | goto out; /* nothing to rename */ |
| 797 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 798 | error = -EEXIST; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 799 | if (sysfs_find_dirent(new_parent_sd, new_ns, new_name)) |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 800 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 801 | |
Eric W. Biederman | 0b4a4fe | 2008-07-03 18:05:28 -0700 | [diff] [blame] | 802 | /* rename sysfs_dirent */ |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 803 | if (strcmp(sd->s_name, new_name) != 0) { |
| 804 | error = -ENOMEM; |
| 805 | new_name = dup_name = kstrdup(new_name, GFP_KERNEL); |
| 806 | if (!new_name) |
| 807 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 808 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 809 | dup_name = sd->s_name; |
| 810 | sd->s_name = new_name; |
| 811 | } |
| 812 | |
| 813 | /* Remove from old parent's list and insert into new parent's list. */ |
| 814 | if (sd->s_parent != new_parent_sd) { |
| 815 | sysfs_unlink_sibling(sd); |
| 816 | sysfs_get(new_parent_sd); |
| 817 | sysfs_put(sd->s_parent); |
| 818 | sd->s_parent = new_parent_sd; |
| 819 | sysfs_link_sibling(sd); |
| 820 | } |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 821 | sd->s_ns = new_ns; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 822 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 823 | error = 0; |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 824 | out: |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 825 | mutex_unlock(&sysfs_mutex); |
| 826 | kfree(dup_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | return error; |
| 828 | } |
| 829 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 830 | int sysfs_rename_dir(struct kobject *kobj, const char *new_name) |
| 831 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 832 | struct sysfs_dirent *parent_sd = kobj->sd->s_parent; |
| 833 | const void *new_ns = NULL; |
| 834 | |
| 835 | if (sysfs_ns_type(parent_sd)) |
| 836 | new_ns = kobj->ktype->namespace(kobj); |
| 837 | |
| 838 | return sysfs_rename(kobj->sd, parent_sd, new_ns, new_name); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 839 | } |
| 840 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 841 | int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 842 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 843 | struct sysfs_dirent *sd = kobj->sd; |
| 844 | struct sysfs_dirent *new_parent_sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 845 | const void *new_ns = NULL; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 846 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 847 | BUG_ON(!sd->s_parent); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 848 | if (sysfs_ns_type(sd->s_parent)) |
| 849 | new_ns = kobj->ktype->namespace(kobj); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 850 | new_parent_sd = new_parent_kobj && new_parent_kobj->sd ? |
Cornelia Huck | a6a8357 | 2009-10-06 15:33:35 +0200 | [diff] [blame] | 851 | new_parent_kobj->sd : &sysfs_root; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 852 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 853 | return sysfs_rename(sd, new_parent_sd, new_ns, sd->s_name); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 854 | } |
| 855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | /* Relationship between s_mode and the DT_xxx types */ |
| 857 | static inline unsigned char dt_type(struct sysfs_dirent *sd) |
| 858 | { |
| 859 | return (sd->s_mode >> 12) & 15; |
| 860 | } |
| 861 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 862 | static int sysfs_dir_release(struct inode *inode, struct file *filp) |
| 863 | { |
| 864 | sysfs_put(filp->private_data); |
| 865 | return 0; |
| 866 | } |
| 867 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 868 | static struct sysfs_dirent *sysfs_dir_pos(const void *ns, |
| 869 | struct sysfs_dirent *parent_sd, ino_t ino, struct sysfs_dirent *pos) |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 870 | { |
| 871 | if (pos) { |
| 872 | int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) && |
| 873 | pos->s_parent == parent_sd && |
| 874 | ino == pos->s_ino; |
| 875 | sysfs_put(pos); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 876 | if (!valid) |
| 877 | pos = NULL; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 878 | } |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 879 | if (!pos && (ino > 1) && (ino < INT_MAX)) { |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 880 | pos = parent_sd->s_dir.children; |
| 881 | while (pos && (ino > pos->s_ino)) |
| 882 | pos = pos->s_sibling; |
| 883 | } |
Eric W. Biederman | af10ec7 | 2010-03-30 11:31:27 -0700 | [diff] [blame] | 884 | while (pos && pos->s_ns && pos->s_ns != ns) |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 885 | pos = pos->s_sibling; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 886 | return pos; |
| 887 | } |
| 888 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 889 | static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns, |
| 890 | struct sysfs_dirent *parent_sd, ino_t ino, struct sysfs_dirent *pos) |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 891 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 892 | pos = sysfs_dir_pos(ns, parent_sd, ino, pos); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 893 | if (pos) |
| 894 | pos = pos->s_sibling; |
Eric W. Biederman | af10ec7 | 2010-03-30 11:31:27 -0700 | [diff] [blame] | 895 | while (pos && pos->s_ns && pos->s_ns != ns) |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 896 | pos = pos->s_sibling; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 897 | return pos; |
| 898 | } |
| 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 901 | { |
Josef "Jeff" Sipek | f427f5d | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 902 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | struct sysfs_dirent * parent_sd = dentry->d_fsdata; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 904 | struct sysfs_dirent *pos = filp->private_data; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 905 | enum kobj_ns_type type; |
| 906 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | ino_t ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 909 | type = sysfs_ns_type(parent_sd); |
| 910 | ns = sysfs_info(dentry->d_sb)->ns[type]; |
| 911 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 912 | if (filp->f_pos == 0) { |
| 913 | ino = parent_sd->s_ino; |
| 914 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0) |
| 915 | filp->f_pos++; |
| 916 | } |
| 917 | if (filp->f_pos == 1) { |
| 918 | if (parent_sd->s_parent) |
| 919 | ino = parent_sd->s_parent->s_ino; |
| 920 | else |
Eric Sandeen | dc35125 | 2007-06-11 14:02:45 +0900 | [diff] [blame] | 921 | ino = parent_sd->s_ino; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 922 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | filp->f_pos++; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 924 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 925 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 926 | for (pos = sysfs_dir_pos(ns, parent_sd, filp->f_pos, pos); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 927 | pos; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 928 | pos = sysfs_dir_next_pos(ns, parent_sd, filp->f_pos, pos)) { |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 929 | const char * name; |
| 930 | unsigned int type; |
| 931 | int len, ret; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 932 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 933 | name = pos->s_name; |
| 934 | len = strlen(name); |
| 935 | ino = pos->s_ino; |
| 936 | type = dt_type(pos); |
| 937 | filp->f_pos = ino; |
| 938 | filp->private_data = sysfs_get(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 939 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 940 | mutex_unlock(&sysfs_mutex); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 941 | ret = filldir(dirent, name, len, filp->f_pos, ino, type); |
| 942 | mutex_lock(&sysfs_mutex); |
| 943 | if (ret < 0) |
| 944 | break; |
| 945 | } |
| 946 | mutex_unlock(&sysfs_mutex); |
| 947 | if ((filp->f_pos > 1) && !pos) { /* EOF */ |
| 948 | filp->f_pos = INT_MAX; |
| 949 | filp->private_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } |
| 951 | return 0; |
| 952 | } |
| 953 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 955 | const struct file_operations sysfs_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | .read = generic_read_dir, |
| 957 | .readdir = sysfs_readdir, |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 958 | .release = sysfs_dir_release, |
Christoph Hellwig | 3222a3e | 2008-09-03 21:53:01 +0200 | [diff] [blame] | 959 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | }; |