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> |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 25 | #include <linux/hash.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "sysfs.h" |
| 27 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 28 | DEFINE_MUTEX(sysfs_mutex); |
Roel Kluin | f7a75f0 | 2007-10-16 23:30:25 -0700 | [diff] [blame] | 29 | DEFINE_SPINLOCK(sysfs_assoc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 31 | #define to_sysfs_dirent(X) rb_entry((X), struct sysfs_dirent, s_rb); |
| 32 | |
Roel Kluin | f7a75f0 | 2007-10-16 23:30:25 -0700 | [diff] [blame] | 33 | static DEFINE_SPINLOCK(sysfs_ino_lock); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 34 | static DEFINE_IDA(sysfs_ino_ida); |
| 35 | |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 36 | /** |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 37 | * sysfs_name_hash |
| 38 | * @ns: Namespace tag to hash |
| 39 | * @name: Null terminated string to hash |
| 40 | * |
| 41 | * Returns 31 bit hash of ns + name (so it fits in an off_t ) |
| 42 | */ |
| 43 | static unsigned int sysfs_name_hash(const void *ns, const char *name) |
| 44 | { |
| 45 | unsigned long hash = init_name_hash(); |
| 46 | unsigned int len = strlen(name); |
| 47 | while (len--) |
| 48 | hash = partial_name_hash(*name++, hash); |
| 49 | hash = ( end_name_hash(hash) ^ hash_ptr( (void *)ns, 31 ) ); |
| 50 | hash &= 0x7fffffffU; |
| 51 | /* Reserve hash numbers 0, 1 and INT_MAX for magic directory entries */ |
| 52 | if (hash < 1) |
| 53 | hash += 2; |
| 54 | if (hash >= INT_MAX) |
| 55 | hash = INT_MAX - 1; |
| 56 | return hash; |
| 57 | } |
| 58 | |
| 59 | static int sysfs_name_compare(unsigned int hash, const void *ns, |
| 60 | const char *name, const struct sysfs_dirent *sd) |
| 61 | { |
| 62 | if (hash != sd->s_hash) |
| 63 | return hash - sd->s_hash; |
| 64 | if (ns != sd->s_ns) |
| 65 | return ns - sd->s_ns; |
| 66 | return strcmp(name, sd->s_name); |
| 67 | } |
| 68 | |
| 69 | static int sysfs_sd_compare(const struct sysfs_dirent *left, |
| 70 | const struct sysfs_dirent *right) |
| 71 | { |
| 72 | return sysfs_name_compare(left->s_hash, left->s_ns, left->s_name, |
| 73 | right); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * sysfs_link_subling - link sysfs_dirent into sibling rbtree |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 78 | * @sd: sysfs_dirent of interest |
| 79 | * |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 80 | * Link @sd into its sibling rbtree which starts from |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 81 | * sd->s_parent->s_dir.children. |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 82 | * |
| 83 | * Locking: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 84 | * mutex_lock(sysfs_mutex) |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 85 | * |
| 86 | * RETURNS: |
| 87 | * 0 on susccess -EEXIST on failure. |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 88 | */ |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 89 | static int sysfs_link_sibling(struct sysfs_dirent *sd) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 90 | { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 91 | struct rb_node **node = &sd->s_parent->s_dir.children.rb_node; |
| 92 | struct rb_node *parent = NULL; |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 93 | |
Greg Kroah-Hartman | 54d20f0 | 2012-03-08 13:03:10 -0800 | [diff] [blame] | 94 | if (sysfs_type(sd) == SYSFS_DIR) |
| 95 | sd->s_parent->s_dir.subdirs++; |
| 96 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 97 | while (*node) { |
| 98 | struct sysfs_dirent *pos; |
| 99 | int result; |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 100 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 101 | pos = to_sysfs_dirent(*node); |
| 102 | parent = *node; |
| 103 | result = sysfs_sd_compare(sd, pos); |
| 104 | if (result < 0) |
| 105 | node = &pos->s_rb.rb_left; |
| 106 | else if (result > 0) |
| 107 | node = &pos->s_rb.rb_right; |
| 108 | else |
| 109 | return -EEXIST; |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 110 | } |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 111 | /* add new node and rebalance the tree */ |
| 112 | rb_link_node(&sd->s_rb, parent, node); |
| 113 | rb_insert_color(&sd->s_rb, &sd->s_parent->s_dir.children); |
| 114 | return 0; |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | /** |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 118 | * sysfs_unlink_sibling - unlink sysfs_dirent from sibling rbtree |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 119 | * @sd: sysfs_dirent of interest |
| 120 | * |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 121 | * Unlink @sd from its sibling rbtree which starts from |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 122 | * sd->s_parent->s_dir.children. |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 123 | * |
| 124 | * Locking: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 125 | * mutex_lock(sysfs_mutex) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 126 | */ |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 127 | static void sysfs_unlink_sibling(struct sysfs_dirent *sd) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 128 | { |
Greg Kroah-Hartman | 54d20f0 | 2012-03-08 13:03:10 -0800 | [diff] [blame] | 129 | if (sysfs_type(sd) == SYSFS_DIR) |
| 130 | sd->s_parent->s_dir.subdirs--; |
| 131 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 132 | rb_erase(&sd->s_rb, &sd->s_parent->s_dir.children); |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 133 | } |
| 134 | |
Alan Stern | 356c05d | 2012-05-14 13:30:03 -0400 | [diff] [blame] | 135 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 136 | |
| 137 | /* Test for attributes that want to ignore lockdep for read-locking */ |
| 138 | static bool ignore_lockdep(struct sysfs_dirent *sd) |
| 139 | { |
| 140 | return sysfs_type(sd) == SYSFS_KOBJ_ATTR && |
| 141 | sd->s_attr.attr->ignore_lockdep; |
| 142 | } |
| 143 | |
| 144 | #else |
| 145 | |
| 146 | static inline bool ignore_lockdep(struct sysfs_dirent *sd) |
| 147 | { |
| 148 | return true; |
| 149 | } |
| 150 | |
| 151 | #endif |
| 152 | |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 153 | /** |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 154 | * sysfs_get_active - get an active reference to sysfs_dirent |
| 155 | * @sd: sysfs_dirent to get an active reference to |
| 156 | * |
| 157 | * Get an active reference of @sd. This function is noop if @sd |
| 158 | * is NULL. |
| 159 | * |
| 160 | * RETURNS: |
| 161 | * Pointer to @sd on success, NULL on failure. |
| 162 | */ |
Eric W. Biederman | e72ceb8 | 2010-02-11 15:18:38 -0800 | [diff] [blame] | 163 | struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd) |
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 | if (unlikely(!sd)) |
| 166 | return NULL; |
| 167 | |
| 168 | while (1) { |
| 169 | int v, t; |
| 170 | |
| 171 | v = atomic_read(&sd->s_active); |
| 172 | if (unlikely(v < 0)) |
| 173 | return NULL; |
| 174 | |
| 175 | t = atomic_cmpxchg(&sd->s_active, v, v + 1); |
Alan Stern | 356c05d | 2012-05-14 13:30:03 -0400 | [diff] [blame] | 176 | if (likely(t == v)) |
| 177 | break; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 178 | if (t < 0) |
| 179 | return NULL; |
| 180 | |
| 181 | cpu_relax(); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 182 | } |
Alan Stern | 356c05d | 2012-05-14 13:30:03 -0400 | [diff] [blame] | 183 | |
| 184 | if (likely(!ignore_lockdep(sd))) |
| 185 | rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); |
| 186 | return sd; |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | /** |
| 190 | * sysfs_put_active - put an active reference to sysfs_dirent |
| 191 | * @sd: sysfs_dirent to put an active reference to |
| 192 | * |
| 193 | * Put an active reference to @sd. This function is noop if @sd |
| 194 | * is NULL. |
| 195 | */ |
Eric W. Biederman | e72ceb8 | 2010-02-11 15:18:38 -0800 | [diff] [blame] | 196 | void sysfs_put_active(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 197 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 198 | int v; |
| 199 | |
| 200 | if (unlikely(!sd)) |
| 201 | return; |
| 202 | |
Alan Stern | 356c05d | 2012-05-14 13:30:03 -0400 | [diff] [blame] | 203 | if (likely(!ignore_lockdep(sd))) |
| 204 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 205 | v = atomic_dec_return(&sd->s_active); |
| 206 | if (likely(v != SD_DEACTIVATED_BIAS)) |
| 207 | return; |
| 208 | |
| 209 | /* atomic_dec_return() is a mb(), we'll always see the updated |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 210 | * sd->u.completion. |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 211 | */ |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 212 | complete(sd->u.completion); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | /** |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 216 | * sysfs_deactivate - deactivate sysfs_dirent |
| 217 | * @sd: sysfs_dirent to deactivate |
| 218 | * |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 219 | * Deny new active references and drain existing ones. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 220 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 221 | static void sysfs_deactivate(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 222 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 223 | DECLARE_COMPLETION_ONSTACK(wait); |
| 224 | int v; |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 225 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 226 | BUG_ON(!(sd->s_flags & SYSFS_FLAG_REMOVED)); |
Eric W. Biederman | a2db684 | 2010-02-11 15:20:00 -0800 | [diff] [blame] | 227 | |
| 228 | if (!(sysfs_type(sd) & SYSFS_ACTIVE_REF)) |
| 229 | return; |
| 230 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 231 | sd->u.completion = (void *)&wait; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 232 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 233 | rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 234 | /* atomic_add_return() is a mb(), put_active() will always see |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 235 | * the updated sd->u.completion. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 236 | */ |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 237 | v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active); |
| 238 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 239 | if (v != SD_DEACTIVATED_BIAS) { |
| 240 | lock_contended(&sd->dep_map, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 241 | wait_for_completion(&wait); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 242 | } |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 243 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 244 | lock_acquired(&sd->dep_map, _RET_IP_); |
| 245 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 246 | } |
| 247 | |
Eric W. Biederman | cafa6b5 | 2011-12-18 20:08:16 -0800 | [diff] [blame] | 248 | static int sysfs_alloc_ino(unsigned int *pino) |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 249 | { |
| 250 | int ino, rc; |
| 251 | |
| 252 | retry: |
| 253 | spin_lock(&sysfs_ino_lock); |
| 254 | rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino); |
| 255 | spin_unlock(&sysfs_ino_lock); |
| 256 | |
| 257 | if (rc == -EAGAIN) { |
| 258 | if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL)) |
| 259 | goto retry; |
| 260 | rc = -ENOMEM; |
| 261 | } |
| 262 | |
| 263 | *pino = ino; |
| 264 | return rc; |
| 265 | } |
| 266 | |
Eric W. Biederman | cafa6b5 | 2011-12-18 20:08:16 -0800 | [diff] [blame] | 267 | static void sysfs_free_ino(unsigned int ino) |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 268 | { |
| 269 | spin_lock(&sysfs_ino_lock); |
| 270 | ida_remove(&sysfs_ino_ida, ino); |
| 271 | spin_unlock(&sysfs_ino_lock); |
| 272 | } |
| 273 | |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 274 | void release_sysfs_dirent(struct sysfs_dirent * sd) |
| 275 | { |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 276 | struct sysfs_dirent *parent_sd; |
| 277 | |
| 278 | repeat: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 279 | /* Moving/renaming is always done while holding reference. |
| 280 | * sd->s_parent won't change beneath us. |
| 281 | */ |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 282 | parent_sd = sd->s_parent; |
| 283 | |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 284 | if (sysfs_type(sd) == SYSFS_KOBJ_LINK) |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 285 | sysfs_put(sd->s_symlink.target_sd); |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 286 | if (sysfs_type(sd) & SYSFS_COPY_NAME) |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 287 | kfree(sd->s_name); |
Eric W. Biederman | 4c3da22 | 2009-11-04 02:50:06 -0800 | [diff] [blame] | 288 | if (sd->s_iattr && sd->s_iattr->ia_secdata) |
| 289 | security_release_secctx(sd->s_iattr->ia_secdata, |
| 290 | sd->s_iattr->ia_secdata_len); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 291 | kfree(sd->s_iattr); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 292 | sysfs_free_ino(sd->s_ino); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 293 | kmem_cache_free(sysfs_dir_cachep, sd); |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 294 | |
| 295 | sd = parent_sd; |
| 296 | if (sd && atomic_dec_and_test(&sd->s_count)) |
| 297 | goto repeat; |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 298 | } |
| 299 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 300 | static int sysfs_dentry_delete(const struct dentry *dentry) |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 301 | { |
| 302 | struct sysfs_dirent *sd = dentry->d_fsdata; |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame^] | 303 | return !(sd && !(sd->s_flags & SYSFS_FLAG_REMOVED)); |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 304 | } |
| 305 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 306 | static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags) |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 307 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 308 | struct sysfs_dirent *sd; |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 309 | int is_dir; |
| 310 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 311 | if (flags & LOOKUP_RCU) |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 312 | return -ECHILD; |
| 313 | |
| 314 | sd = dentry->d_fsdata; |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 315 | mutex_lock(&sysfs_mutex); |
| 316 | |
| 317 | /* The sysfs dirent has been deleted */ |
| 318 | if (sd->s_flags & SYSFS_FLAG_REMOVED) |
| 319 | goto out_bad; |
| 320 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 321 | /* The sysfs dirent has been moved? */ |
| 322 | if (dentry->d_parent->d_fsdata != sd->s_parent) |
| 323 | goto out_bad; |
| 324 | |
| 325 | /* The sysfs dirent has been renamed */ |
| 326 | if (strcmp(dentry->d_name.name, sd->s_name) != 0) |
| 327 | goto out_bad; |
| 328 | |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 329 | mutex_unlock(&sysfs_mutex); |
| 330 | out_valid: |
| 331 | return 1; |
| 332 | out_bad: |
| 333 | /* Remove the dentry from the dcache hashes. |
| 334 | * If this is a deleted dentry we use d_drop instead of d_delete |
| 335 | * so sysfs doesn't need to cope with negative dentries. |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 336 | * |
| 337 | * If this is a dentry that has simply been renamed we |
| 338 | * use d_drop to remove it from the dcache lookup on its |
| 339 | * old parent. If this dentry persists later when a lookup |
| 340 | * is performed at its new name the dentry will be readded |
| 341 | * to the dcache hashes. |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 342 | */ |
| 343 | is_dir = (sysfs_type(sd) == SYSFS_DIR); |
| 344 | mutex_unlock(&sysfs_mutex); |
| 345 | if (is_dir) { |
| 346 | /* If we have submounts we must allow the vfs caches |
| 347 | * to lie about the state of the filesystem to prevent |
| 348 | * leaks and other nasty things. |
| 349 | */ |
| 350 | if (have_submounts(dentry)) |
| 351 | goto out_valid; |
| 352 | shrink_dcache_parent(dentry); |
| 353 | } |
| 354 | d_drop(dentry); |
| 355 | return 0; |
| 356 | } |
| 357 | |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame^] | 358 | static void sysfs_dentry_release(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | { |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame^] | 360 | sysfs_put(dentry->d_fsdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame^] | 363 | const struct dentry_operations sysfs_dentry_ops = { |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 364 | .d_revalidate = sysfs_dentry_revalidate, |
| 365 | .d_delete = sysfs_dentry_delete, |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame^] | 366 | .d_release = sysfs_dentry_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | }; |
| 368 | |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 369 | 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] | 370 | { |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 371 | char *dup_name = NULL; |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 372 | struct sysfs_dirent *sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 373 | |
| 374 | if (type & SYSFS_COPY_NAME) { |
| 375 | name = dup_name = kstrdup(name, GFP_KERNEL); |
| 376 | if (!name) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 377 | return NULL; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 378 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 380 | sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | if (!sd) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 382 | goto err_out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 384 | if (sysfs_alloc_ino(&sd->s_ino)) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 385 | goto err_out2; |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | atomic_set(&sd->s_count, 1); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 388 | atomic_set(&sd->s_active, 0); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 389 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 390 | sd->s_name = name; |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 391 | sd->s_mode = mode; |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 392 | sd->s_flags = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | return sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 395 | |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 396 | err_out2: |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 397 | kmem_cache_free(sysfs_dir_cachep, sd); |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 398 | err_out1: |
| 399 | kfree(dup_name); |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 400 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 403 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 404 | * sysfs_addrm_start - prepare for sysfs_dirent add/remove |
| 405 | * @acxt: pointer to sysfs_addrm_cxt to be used |
| 406 | * @parent_sd: parent sysfs_dirent |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 407 | * |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 408 | * This function is called when the caller is about to add or |
| 409 | * remove sysfs_dirent under @parent_sd. This function acquires |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 410 | * sysfs_mutex. @acxt is used to keep and pass context to |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 411 | * other addrm functions. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 412 | * |
| 413 | * LOCKING: |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 414 | * Kernel thread context (may sleep). sysfs_mutex is locked on |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 415 | * return. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 416 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 417 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
| 418 | struct sysfs_dirent *parent_sd) |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 419 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 420 | memset(acxt, 0, sizeof(*acxt)); |
| 421 | acxt->parent_sd = parent_sd; |
| 422 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 423 | mutex_lock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | /** |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 427 | * __sysfs_add_one - add sysfs_dirent to parent without warning |
| 428 | * @acxt: addrm context to use |
| 429 | * @sd: sysfs_dirent to be added |
| 430 | * |
| 431 | * Get @acxt->parent_sd and set sd->s_parent to it and increment |
| 432 | * nlink of parent inode if @sd is a directory and link into the |
| 433 | * children list of the parent. |
| 434 | * |
| 435 | * This function should be called between calls to |
| 436 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 437 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 438 | * |
| 439 | * LOCKING: |
| 440 | * Determined by sysfs_addrm_start(). |
| 441 | * |
| 442 | * RETURNS: |
| 443 | * 0 on success, -EEXIST if entry with the given name already |
| 444 | * exists. |
| 445 | */ |
| 446 | int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 447 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 448 | struct sysfs_inode_attrs *ps_iattr; |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 449 | int ret; |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 450 | |
Eric W. Biederman | 903e21e | 2011-10-12 22:02:43 +0000 | [diff] [blame] | 451 | if (!!sysfs_ns_type(acxt->parent_sd) != !!sd->s_ns) { |
| 452 | WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n", |
| 453 | sysfs_ns_type(acxt->parent_sd)? "required": "invalid", |
| 454 | acxt->parent_sd->s_name, sd->s_name); |
| 455 | return -EINVAL; |
| 456 | } |
| 457 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 458 | sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name); |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 459 | sd->s_parent = sysfs_get(acxt->parent_sd); |
| 460 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 461 | ret = sysfs_link_sibling(sd); |
| 462 | if (ret) |
| 463 | return ret; |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 464 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 465 | /* Update timestamps on the parent */ |
| 466 | ps_iattr = acxt->parent_sd->s_iattr; |
| 467 | if (ps_iattr) { |
| 468 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 469 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 470 | } |
| 471 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | /** |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 476 | * sysfs_pathname - return full path to sysfs dirent |
| 477 | * @sd: sysfs_dirent whose path we want |
| 478 | * @path: caller allocated buffer |
| 479 | * |
| 480 | * Gives the name "/" to the sysfs_root entry; any path returned |
| 481 | * is relative to wherever sysfs is mounted. |
| 482 | * |
| 483 | * XXX: does no error checking on @path size |
| 484 | */ |
| 485 | static char *sysfs_pathname(struct sysfs_dirent *sd, char *path) |
| 486 | { |
| 487 | if (sd->s_parent) { |
| 488 | sysfs_pathname(sd->s_parent, path); |
| 489 | strcat(path, "/"); |
| 490 | } |
| 491 | strcat(path, sd->s_name); |
| 492 | return path; |
| 493 | } |
| 494 | |
| 495 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 496 | * sysfs_add_one - add sysfs_dirent to parent |
| 497 | * @acxt: addrm context to use |
| 498 | * @sd: sysfs_dirent to be added |
| 499 | * |
| 500 | * 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] | 501 | * nlink of parent inode if @sd is a directory and link into the |
| 502 | * children list of the parent. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 503 | * |
| 504 | * This function should be called between calls to |
| 505 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 506 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 507 | * |
| 508 | * LOCKING: |
| 509 | * Determined by sysfs_addrm_start(). |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 510 | * |
| 511 | * RETURNS: |
| 512 | * 0 on success, -EEXIST if entry with the given name already |
| 513 | * exists. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 514 | */ |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 515 | 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] | 516 | { |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 517 | int ret; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 518 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 519 | ret = __sysfs_add_one(acxt, sd); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 520 | if (ret == -EEXIST) { |
| 521 | char *path = kzalloc(PATH_MAX, GFP_KERNEL); |
| 522 | WARN(1, KERN_WARNING |
| 523 | "sysfs: cannot create duplicate filename '%s'\n", |
| 524 | (path == NULL) ? sd->s_name : |
| 525 | strcat(strcat(sysfs_pathname(acxt->parent_sd, path), "/"), |
| 526 | sd->s_name)); |
| 527 | kfree(path); |
| 528 | } |
| 529 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 530 | return ret; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | /** |
| 534 | * sysfs_remove_one - remove sysfs_dirent from parent |
| 535 | * @acxt: addrm context to use |
Jean Delvare | 9fd5b1c | 2008-01-08 18:11:24 +0100 | [diff] [blame] | 536 | * @sd: sysfs_dirent to be removed |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 537 | * |
| 538 | * 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] | 539 | * directory. @sd is unlinked from the children list. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 540 | * |
| 541 | * This function should be called between calls to |
| 542 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 543 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 544 | * |
| 545 | * LOCKING: |
| 546 | * Determined by sysfs_addrm_start(). |
| 547 | */ |
| 548 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 549 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 550 | struct sysfs_inode_attrs *ps_iattr; |
| 551 | |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 552 | BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 553 | |
| 554 | sysfs_unlink_sibling(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 555 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 556 | /* Update timestamps on the parent */ |
| 557 | ps_iattr = acxt->parent_sd->s_iattr; |
| 558 | if (ps_iattr) { |
| 559 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 560 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 561 | } |
| 562 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 563 | sd->s_flags |= SYSFS_FLAG_REMOVED; |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 564 | sd->u.removed_list = acxt->removed; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 565 | acxt->removed = sd; |
Tejun Heo | a0edd7c | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 566 | } |
| 567 | |
| 568 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 569 | * sysfs_addrm_finish - finish up sysfs_dirent add/remove |
| 570 | * @acxt: addrm context to finish up |
| 571 | * |
| 572 | * Finish up sysfs_dirent add/remove. Resources acquired by |
| 573 | * sysfs_addrm_start() are released and removed sysfs_dirents are |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 574 | * cleaned up. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 575 | * |
| 576 | * LOCKING: |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 577 | * sysfs_mutex is released. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 578 | */ |
Tejun Heo | 990e53f | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 579 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 580 | { |
| 581 | /* release resources acquired by sysfs_addrm_start() */ |
| 582 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 583 | |
| 584 | /* kill removed sysfs_dirents */ |
| 585 | while (acxt->removed) { |
| 586 | struct sysfs_dirent *sd = acxt->removed; |
| 587 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 588 | acxt->removed = sd->u.removed_list; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 589 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 590 | sysfs_deactivate(sd); |
Eric W. Biederman | e0edd3c | 2009-03-04 11:57:20 -0800 | [diff] [blame] | 591 | unmap_bin_file(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 592 | sysfs_put(sd); |
| 593 | } |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 594 | } |
| 595 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 596 | /** |
| 597 | * sysfs_find_dirent - find sysfs_dirent with the given name |
| 598 | * @parent_sd: sysfs_dirent to search under |
| 599 | * @name: name to look for |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 600 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 601 | * Look for sysfs_dirent with name @name under @parent_sd. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 602 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 603 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 604 | * mutex_lock(sysfs_mutex) |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 605 | * |
| 606 | * RETURNS: |
| 607 | * Pointer to sysfs_dirent if found, NULL if not. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 608 | */ |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 609 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 610 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 611 | const unsigned char *name) |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 612 | { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 613 | struct rb_node *node = parent_sd->s_dir.children.rb_node; |
| 614 | unsigned int hash; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 615 | |
Eric W. Biederman | 903e21e | 2011-10-12 22:02:43 +0000 | [diff] [blame] | 616 | if (!!sysfs_ns_type(parent_sd) != !!ns) { |
| 617 | WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n", |
| 618 | sysfs_ns_type(parent_sd)? "required": "invalid", |
| 619 | parent_sd->s_name, name); |
| 620 | return NULL; |
| 621 | } |
| 622 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 623 | hash = sysfs_name_hash(ns, name); |
| 624 | while (node) { |
| 625 | struct sysfs_dirent *sd; |
| 626 | int result; |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 627 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 628 | sd = to_sysfs_dirent(node); |
| 629 | result = sysfs_name_compare(hash, ns, name, sd); |
| 630 | if (result < 0) |
| 631 | node = node->rb_left; |
| 632 | else if (result > 0) |
| 633 | node = node->rb_right; |
| 634 | else |
| 635 | return sd; |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 636 | } |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 637 | return NULL; |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 638 | } |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 639 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 640 | /** |
| 641 | * sysfs_get_dirent - find and get sysfs_dirent with the given name |
| 642 | * @parent_sd: sysfs_dirent to search under |
| 643 | * @name: name to look for |
| 644 | * |
| 645 | * Look for sysfs_dirent with name @name under @parent_sd and get |
| 646 | * it if found. |
| 647 | * |
| 648 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 649 | * Kernel thread context (may sleep). Grabs sysfs_mutex. |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 650 | * |
| 651 | * RETURNS: |
| 652 | * Pointer to sysfs_dirent if found, NULL if not. |
| 653 | */ |
| 654 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 655 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 656 | const unsigned char *name) |
| 657 | { |
| 658 | struct sysfs_dirent *sd; |
| 659 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 660 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 661 | sd = sysfs_find_dirent(parent_sd, ns, name); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 662 | sysfs_get(sd); |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 663 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 664 | |
| 665 | return sd; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 666 | } |
Neil Brown | f1282c8 | 2008-07-16 08:58:04 +1000 | [diff] [blame] | 667 | EXPORT_SYMBOL_GPL(sysfs_get_dirent); |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 668 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 669 | 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] | 670 | enum kobj_ns_type type, const void *ns, const char *name, |
| 671 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 674 | struct sysfs_addrm_cxt acxt; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 675 | struct sysfs_dirent *sd; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 676 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 678 | /* allocate */ |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 679 | sd = sysfs_new_dirent(name, mode, SYSFS_DIR); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 680 | if (!sd) |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 681 | return -ENOMEM; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 682 | |
| 683 | sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT); |
| 684 | sd->s_ns = ns; |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 685 | sd->s_dir.kobj = kobj; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 686 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 687 | /* link in */ |
| 688 | sysfs_addrm_start(&acxt, parent_sd); |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 689 | rc = sysfs_add_one(&acxt, sd); |
| 690 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 691 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 692 | if (rc == 0) |
| 693 | *p_sd = sd; |
| 694 | else |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 695 | sysfs_put(sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 696 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 697 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | } |
| 699 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 700 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| 701 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 703 | return create_dir(kobj, kobj->sd, |
| 704 | KOBJ_NS_TYPE_NONE, NULL, name, p_sd); |
| 705 | } |
| 706 | |
Serge E. Hallyn | be867b1 | 2010-05-03 16:23:15 -0500 | [diff] [blame] | 707 | /** |
| 708 | * sysfs_read_ns_type: return associated ns_type |
| 709 | * @kobj: the kobject being queried |
| 710 | * |
| 711 | * Each kobject can be tagged with exactly one namespace type |
| 712 | * (i.e. network or user). Return the ns_type associated with |
| 713 | * this object if any |
| 714 | */ |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 715 | static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj) |
| 716 | { |
| 717 | const struct kobj_ns_type_operations *ops; |
| 718 | enum kobj_ns_type type; |
| 719 | |
| 720 | ops = kobj_child_ns_ops(kobj); |
| 721 | if (!ops) |
| 722 | return KOBJ_NS_TYPE_NONE; |
| 723 | |
| 724 | type = ops->type; |
| 725 | BUG_ON(type <= KOBJ_NS_TYPE_NONE); |
| 726 | BUG_ON(type >= KOBJ_NS_TYPES); |
| 727 | BUG_ON(!kobj_ns_type_registered(type)); |
| 728 | |
| 729 | return type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /** |
| 733 | * sysfs_create_dir - create a directory for an object. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | * @kobj: object we're creating directory for. |
| 735 | */ |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 736 | int sysfs_create_dir(struct kobject * kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 738 | enum kobj_ns_type type; |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 739 | struct sysfs_dirent *parent_sd, *sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 740 | const void *ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | int error = 0; |
| 742 | |
| 743 | BUG_ON(!kobj); |
| 744 | |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 745 | if (kobj->parent) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 746 | parent_sd = kobj->parent->sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | else |
Eric W. Biederman | 7d0c7d6 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 748 | parent_sd = &sysfs_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Dan Williams | 3a19888 | 2012-04-06 13:41:06 -0700 | [diff] [blame] | 750 | if (!parent_sd) |
| 751 | return -ENOENT; |
| 752 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 753 | if (sysfs_ns_type(parent_sd)) |
| 754 | ns = kobj->ktype->namespace(kobj); |
| 755 | type = sysfs_read_ns_type(kobj); |
| 756 | |
| 757 | error = create_dir(kobj, parent_sd, type, ns, kobject_name(kobj), &sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | if (!error) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 759 | kobj->sd = sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | return error; |
| 761 | } |
| 762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 764 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | { |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 766 | struct dentry *ret = NULL; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 767 | struct dentry *parent = dentry->d_parent; |
| 768 | struct sysfs_dirent *parent_sd = parent->d_fsdata; |
Tejun Heo | a7a0475 | 2007-08-02 21:38:02 +0900 | [diff] [blame] | 769 | struct sysfs_dirent *sd; |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 770 | struct inode *inode; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 771 | enum kobj_ns_type type; |
| 772 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 774 | mutex_lock(&sysfs_mutex); |
| 775 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 776 | type = sysfs_ns_type(parent_sd); |
| 777 | ns = sysfs_info(dir->i_sb)->ns[type]; |
| 778 | |
| 779 | sd = sysfs_find_dirent(parent_sd, ns, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 781 | /* no such entry */ |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 782 | if (!sd) { |
| 783 | ret = ERR_PTR(-ENOENT); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 784 | goto out_unlock; |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 785 | } |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame^] | 786 | dentry->d_fsdata = sysfs_get(sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 787 | |
| 788 | /* attach dentry and inode */ |
Eric W. Biederman | fac2622 | 2010-02-12 19:22:27 -0800 | [diff] [blame] | 789 | inode = sysfs_get_inode(dir->i_sb, sd); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 790 | if (!inode) { |
| 791 | ret = ERR_PTR(-ENOMEM); |
| 792 | goto out_unlock; |
| 793 | } |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 794 | |
Tejun Heo | d6b4fd2 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 795 | /* instantiate and hash dentry */ |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 796 | ret = d_find_alias(inode); |
| 797 | if (!ret) { |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 798 | d_add(dentry, inode); |
| 799 | } else { |
| 800 | d_move(ret, dentry); |
| 801 | iput(inode); |
| 802 | } |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 803 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 804 | out_unlock: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 805 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 806 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
| 808 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 809 | const struct inode_operations sysfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | .lookup = sysfs_lookup, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 811 | .permission = sysfs_permission, |
Maneesh Soni | 988d186 | 2005-05-31 10:39:14 +0530 | [diff] [blame] | 812 | .setattr = sysfs_setattr, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 813 | .getattr = sysfs_getattr, |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 814 | .setxattr = sysfs_setxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | }; |
| 816 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 817 | static void remove_dir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 819 | struct sysfs_addrm_cxt acxt; |
| 820 | |
| 821 | sysfs_addrm_start(&acxt, sd->s_parent); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 822 | sysfs_remove_one(&acxt, sd); |
| 823 | sysfs_addrm_finish(&acxt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | } |
| 825 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 826 | void sysfs_remove_subdir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 828 | remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 832 | static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 834 | struct sysfs_addrm_cxt acxt; |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 835 | struct rb_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 837 | if (!dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | return; |
| 839 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 840 | pr_debug("sysfs %s: removing dir\n", dir_sd->s_name); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 841 | sysfs_addrm_start(&acxt, dir_sd); |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 842 | pos = rb_first(&dir_sd->s_dir.children); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 843 | while (pos) { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 844 | struct sysfs_dirent *sd = to_sysfs_dirent(pos); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 845 | pos = rb_next(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 846 | if (sysfs_type(sd) != SYSFS_DIR) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 847 | sysfs_remove_one(&acxt, sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 849 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 850 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 851 | remove_dir(dir_sd); |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 852 | } |
| 853 | |
| 854 | /** |
| 855 | * sysfs_remove_dir - remove an object's directory. |
| 856 | * @kobj: object. |
| 857 | * |
| 858 | * The only thing special about this is that we remove any files in |
| 859 | * the directory before we remove the directory, and we've inlined |
| 860 | * what used to be sysfs_rmdir() below, instead of calling separately. |
| 861 | */ |
| 862 | |
| 863 | void sysfs_remove_dir(struct kobject * kobj) |
| 864 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 865 | struct sysfs_dirent *sd = kobj->sd; |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 866 | |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 867 | spin_lock(&sysfs_assoc_lock); |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 868 | kobj->sd = NULL; |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 869 | spin_unlock(&sysfs_assoc_lock); |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 870 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 871 | __sysfs_remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | } |
| 873 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 874 | int sysfs_rename(struct sysfs_dirent *sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 875 | struct sysfs_dirent *new_parent_sd, const void *new_ns, |
| 876 | const char *new_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | { |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 878 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 880 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 932ea2e | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 881 | |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 882 | error = 0; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 883 | 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] | 884 | (strcmp(sd->s_name, new_name) == 0)) |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 885 | goto out; /* nothing to rename */ |
| 886 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 887 | error = -EEXIST; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 888 | if (sysfs_find_dirent(new_parent_sd, new_ns, new_name)) |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 889 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 890 | |
Eric W. Biederman | 0b4a4fe | 2008-07-03 18:05:28 -0700 | [diff] [blame] | 891 | /* rename sysfs_dirent */ |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 892 | if (strcmp(sd->s_name, new_name) != 0) { |
| 893 | error = -ENOMEM; |
Sasikantha babu | b4eafca | 2012-05-03 02:26:14 +0530 | [diff] [blame] | 894 | new_name = kstrdup(new_name, GFP_KERNEL); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 895 | if (!new_name) |
| 896 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 897 | |
Sasikantha babu | b4eafca | 2012-05-03 02:26:14 +0530 | [diff] [blame] | 898 | kfree(sd->s_name); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 899 | sd->s_name = new_name; |
| 900 | } |
| 901 | |
Eric W. Biederman | f6d90b4 | 2011-11-01 07:06:17 -0700 | [diff] [blame] | 902 | /* Move to the appropriate place in the appropriate directories rbtree. */ |
| 903 | sysfs_unlink_sibling(sd); |
| 904 | sysfs_get(new_parent_sd); |
| 905 | sysfs_put(sd->s_parent); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 906 | sd->s_ns = new_ns; |
Tom Goff | 70fa4a6 | 2012-04-04 12:06:20 -0700 | [diff] [blame] | 907 | sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name); |
Eric W. Biederman | f6d90b4 | 2011-11-01 07:06:17 -0700 | [diff] [blame] | 908 | sd->s_parent = new_parent_sd; |
| 909 | sysfs_link_sibling(sd); |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 910 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 911 | error = 0; |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 912 | out: |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 913 | mutex_unlock(&sysfs_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | return error; |
| 915 | } |
| 916 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 917 | int sysfs_rename_dir(struct kobject *kobj, const char *new_name) |
| 918 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 919 | struct sysfs_dirent *parent_sd = kobj->sd->s_parent; |
| 920 | const void *new_ns = NULL; |
| 921 | |
| 922 | if (sysfs_ns_type(parent_sd)) |
| 923 | new_ns = kobj->ktype->namespace(kobj); |
| 924 | |
| 925 | return sysfs_rename(kobj->sd, parent_sd, new_ns, new_name); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 926 | } |
| 927 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 928 | int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 929 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 930 | struct sysfs_dirent *sd = kobj->sd; |
| 931 | struct sysfs_dirent *new_parent_sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 932 | const void *new_ns = NULL; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 933 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 934 | BUG_ON(!sd->s_parent); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 935 | if (sysfs_ns_type(sd->s_parent)) |
| 936 | new_ns = kobj->ktype->namespace(kobj); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 937 | new_parent_sd = new_parent_kobj && new_parent_kobj->sd ? |
Cornelia Huck | a6a8357 | 2009-10-06 15:33:35 +0200 | [diff] [blame] | 938 | new_parent_kobj->sd : &sysfs_root; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 939 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 940 | return sysfs_rename(sd, new_parent_sd, new_ns, sd->s_name); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 941 | } |
| 942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | /* Relationship between s_mode and the DT_xxx types */ |
| 944 | static inline unsigned char dt_type(struct sysfs_dirent *sd) |
| 945 | { |
| 946 | return (sd->s_mode >> 12) & 15; |
| 947 | } |
| 948 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 949 | static int sysfs_dir_release(struct inode *inode, struct file *filp) |
| 950 | { |
| 951 | sysfs_put(filp->private_data); |
| 952 | return 0; |
| 953 | } |
| 954 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 955 | static struct sysfs_dirent *sysfs_dir_pos(const void *ns, |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 956 | struct sysfs_dirent *parent_sd, loff_t hash, struct sysfs_dirent *pos) |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 957 | { |
| 958 | if (pos) { |
| 959 | int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) && |
| 960 | pos->s_parent == parent_sd && |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 961 | hash == pos->s_hash; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 962 | sysfs_put(pos); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 963 | if (!valid) |
| 964 | pos = NULL; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 965 | } |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 966 | if (!pos && (hash > 1) && (hash < INT_MAX)) { |
| 967 | struct rb_node *node = parent_sd->s_dir.children.rb_node; |
| 968 | while (node) { |
| 969 | pos = to_sysfs_dirent(node); |
| 970 | |
| 971 | if (hash < pos->s_hash) |
| 972 | node = node->rb_left; |
| 973 | else if (hash > pos->s_hash) |
| 974 | node = node->rb_right; |
| 975 | else |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 976 | break; |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 977 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 978 | } |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 979 | /* Skip over entries in the wrong namespace */ |
Eric W. Biederman | b9e2780d | 2011-10-25 05:38:41 -0700 | [diff] [blame] | 980 | while (pos && pos->s_ns != ns) { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 981 | struct rb_node *node = rb_next(&pos->s_rb); |
| 982 | if (!node) |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 983 | pos = NULL; |
| 984 | else |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 985 | pos = to_sysfs_dirent(node); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 986 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 987 | return pos; |
| 988 | } |
| 989 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 990 | static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns, |
| 991 | 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] | 992 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 993 | pos = sysfs_dir_pos(ns, parent_sd, ino, pos); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 994 | if (pos) do { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 995 | struct rb_node *node = rb_next(&pos->s_rb); |
| 996 | if (!node) |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 997 | pos = NULL; |
| 998 | else |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 999 | pos = to_sysfs_dirent(node); |
Eric W. Biederman | b9e2780d | 2011-10-25 05:38:41 -0700 | [diff] [blame] | 1000 | } while (pos && pos->s_ns != ns); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1001 | return pos; |
| 1002 | } |
| 1003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 1005 | { |
Josef "Jeff" Sipek | f427f5d | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1006 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | struct sysfs_dirent * parent_sd = dentry->d_fsdata; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1008 | struct sysfs_dirent *pos = filp->private_data; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1009 | enum kobj_ns_type type; |
| 1010 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | ino_t ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1013 | type = sysfs_ns_type(parent_sd); |
| 1014 | ns = sysfs_info(dentry->d_sb)->ns[type]; |
| 1015 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1016 | if (filp->f_pos == 0) { |
| 1017 | ino = parent_sd->s_ino; |
| 1018 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0) |
| 1019 | filp->f_pos++; |
| 1020 | } |
| 1021 | if (filp->f_pos == 1) { |
| 1022 | if (parent_sd->s_parent) |
| 1023 | ino = parent_sd->s_parent->s_ino; |
| 1024 | else |
Eric Sandeen | dc35125 | 2007-06-11 14:02:45 +0900 | [diff] [blame] | 1025 | ino = parent_sd->s_ino; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1026 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | filp->f_pos++; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1028 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1029 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1030 | 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] | 1031 | pos; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1032 | 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] | 1033 | const char * name; |
| 1034 | unsigned int type; |
| 1035 | int len, ret; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1036 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1037 | name = pos->s_name; |
| 1038 | len = strlen(name); |
| 1039 | ino = pos->s_ino; |
| 1040 | type = dt_type(pos); |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 1041 | filp->f_pos = pos->s_hash; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1042 | filp->private_data = sysfs_get(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1043 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1044 | mutex_unlock(&sysfs_mutex); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1045 | ret = filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1046 | mutex_lock(&sysfs_mutex); |
| 1047 | if (ret < 0) |
| 1048 | break; |
| 1049 | } |
| 1050 | mutex_unlock(&sysfs_mutex); |
| 1051 | if ((filp->f_pos > 1) && !pos) { /* EOF */ |
| 1052 | filp->f_pos = INT_MAX; |
| 1053 | filp->private_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | } |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1059 | const struct file_operations sysfs_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | .read = generic_read_dir, |
| 1061 | .readdir = sysfs_readdir, |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1062 | .release = sysfs_dir_release, |
Christoph Hellwig | 3222a3e | 2008-09-03 21:53:01 +0200 | [diff] [blame] | 1063 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | }; |