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 | /** |
Warner Wang | 4347491 | 2013-05-13 11:11:05 +0800 | [diff] [blame] | 77 | * sysfs_link_sibling - 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 | |
Maarten Lankhorst | 3db3c62 | 2013-03-08 16:07:27 +0100 | [diff] [blame] | 168 | if (!atomic_inc_unless_negative(&sd->s_active)) |
| 169 | return NULL; |
Alan Stern | 356c05d | 2012-05-14 13:30:03 -0400 | [diff] [blame] | 170 | |
| 171 | if (likely(!ignore_lockdep(sd))) |
| 172 | rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); |
| 173 | return sd; |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | /** |
| 177 | * sysfs_put_active - put an active reference to sysfs_dirent |
| 178 | * @sd: sysfs_dirent to put an active reference to |
| 179 | * |
| 180 | * Put an active reference to @sd. This function is noop if @sd |
| 181 | * is NULL. |
| 182 | */ |
Eric W. Biederman | e72ceb8 | 2010-02-11 15:18:38 -0800 | [diff] [blame] | 183 | void sysfs_put_active(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 184 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 185 | int v; |
| 186 | |
| 187 | if (unlikely(!sd)) |
| 188 | return; |
| 189 | |
Alan Stern | 356c05d | 2012-05-14 13:30:03 -0400 | [diff] [blame] | 190 | if (likely(!ignore_lockdep(sd))) |
| 191 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 192 | v = atomic_dec_return(&sd->s_active); |
| 193 | if (likely(v != SD_DEACTIVATED_BIAS)) |
| 194 | return; |
| 195 | |
| 196 | /* atomic_dec_return() is a mb(), we'll always see the updated |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 197 | * sd->u.completion. |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 198 | */ |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 199 | complete(sd->u.completion); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | /** |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 203 | * sysfs_deactivate - deactivate sysfs_dirent |
| 204 | * @sd: sysfs_dirent to deactivate |
| 205 | * |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 206 | * Deny new active references and drain existing ones. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 207 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 208 | static void sysfs_deactivate(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 209 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 210 | DECLARE_COMPLETION_ONSTACK(wait); |
| 211 | int v; |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 212 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 213 | BUG_ON(!(sd->s_flags & SYSFS_FLAG_REMOVED)); |
Eric W. Biederman | a2db684 | 2010-02-11 15:20:00 -0800 | [diff] [blame] | 214 | |
| 215 | if (!(sysfs_type(sd) & SYSFS_ACTIVE_REF)) |
| 216 | return; |
| 217 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 218 | sd->u.completion = (void *)&wait; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 219 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 220 | rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 221 | /* atomic_add_return() is a mb(), put_active() will always see |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 222 | * the updated sd->u.completion. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 223 | */ |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 224 | v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active); |
| 225 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 226 | if (v != SD_DEACTIVATED_BIAS) { |
| 227 | lock_contended(&sd->dep_map, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 228 | wait_for_completion(&wait); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 229 | } |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 230 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 231 | lock_acquired(&sd->dep_map, _RET_IP_); |
| 232 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 233 | } |
| 234 | |
Eric W. Biederman | cafa6b5 | 2011-12-18 20:08:16 -0800 | [diff] [blame] | 235 | static int sysfs_alloc_ino(unsigned int *pino) |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 236 | { |
| 237 | int ino, rc; |
| 238 | |
| 239 | retry: |
| 240 | spin_lock(&sysfs_ino_lock); |
| 241 | rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino); |
| 242 | spin_unlock(&sysfs_ino_lock); |
| 243 | |
| 244 | if (rc == -EAGAIN) { |
| 245 | if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL)) |
| 246 | goto retry; |
| 247 | rc = -ENOMEM; |
| 248 | } |
| 249 | |
| 250 | *pino = ino; |
| 251 | return rc; |
| 252 | } |
| 253 | |
Eric W. Biederman | cafa6b5 | 2011-12-18 20:08:16 -0800 | [diff] [blame] | 254 | static void sysfs_free_ino(unsigned int ino) |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 255 | { |
| 256 | spin_lock(&sysfs_ino_lock); |
| 257 | ida_remove(&sysfs_ino_ida, ino); |
| 258 | spin_unlock(&sysfs_ino_lock); |
| 259 | } |
| 260 | |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 261 | void release_sysfs_dirent(struct sysfs_dirent * sd) |
| 262 | { |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 263 | struct sysfs_dirent *parent_sd; |
| 264 | |
| 265 | repeat: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 266 | /* Moving/renaming is always done while holding reference. |
| 267 | * sd->s_parent won't change beneath us. |
| 268 | */ |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 269 | parent_sd = sd->s_parent; |
| 270 | |
Ming Lei | bb2b005 | 2013-04-04 22:22:37 +0800 | [diff] [blame] | 271 | WARN(!(sd->s_flags & SYSFS_FLAG_REMOVED), |
| 272 | "sysfs: free using entry: %s/%s\n", |
| 273 | parent_sd ? parent_sd->s_name : "", sd->s_name); |
| 274 | |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 275 | if (sysfs_type(sd) == SYSFS_KOBJ_LINK) |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 276 | sysfs_put(sd->s_symlink.target_sd); |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 277 | if (sysfs_type(sd) & SYSFS_COPY_NAME) |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 278 | kfree(sd->s_name); |
Eric W. Biederman | 4c3da22 | 2009-11-04 02:50:06 -0800 | [diff] [blame] | 279 | if (sd->s_iattr && sd->s_iattr->ia_secdata) |
| 280 | security_release_secctx(sd->s_iattr->ia_secdata, |
| 281 | sd->s_iattr->ia_secdata_len); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 282 | kfree(sd->s_iattr); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 283 | sysfs_free_ino(sd->s_ino); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 284 | kmem_cache_free(sysfs_dir_cachep, sd); |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 285 | |
| 286 | sd = parent_sd; |
| 287 | if (sd && atomic_dec_and_test(&sd->s_count)) |
| 288 | goto repeat; |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 289 | } |
| 290 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 291 | static int sysfs_dentry_delete(const struct dentry *dentry) |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 292 | { |
| 293 | struct sysfs_dirent *sd = dentry->d_fsdata; |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame] | 294 | return !(sd && !(sd->s_flags & SYSFS_FLAG_REMOVED)); |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 295 | } |
| 296 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 297 | static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags) |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 298 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 299 | struct sysfs_dirent *sd; |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 300 | int is_dir; |
Glauber Costa | e5bcac6 | 2012-07-06 13:09:07 +0400 | [diff] [blame] | 301 | int type; |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 302 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 303 | if (flags & LOOKUP_RCU) |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 304 | return -ECHILD; |
| 305 | |
| 306 | sd = dentry->d_fsdata; |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 307 | mutex_lock(&sysfs_mutex); |
| 308 | |
| 309 | /* The sysfs dirent has been deleted */ |
| 310 | if (sd->s_flags & SYSFS_FLAG_REMOVED) |
| 311 | goto out_bad; |
| 312 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 313 | /* The sysfs dirent has been moved? */ |
| 314 | if (dentry->d_parent->d_fsdata != sd->s_parent) |
| 315 | goto out_bad; |
| 316 | |
| 317 | /* The sysfs dirent has been renamed */ |
| 318 | if (strcmp(dentry->d_name.name, sd->s_name) != 0) |
| 319 | goto out_bad; |
| 320 | |
Glauber Costa | e5bcac6 | 2012-07-06 13:09:07 +0400 | [diff] [blame] | 321 | /* The sysfs dirent has been moved to a different namespace */ |
| 322 | type = KOBJ_NS_TYPE_NONE; |
Andrew Morton | 17f79be | 2012-07-09 16:13:36 -0700 | [diff] [blame] | 323 | if (sd->s_parent) { |
Glauber Costa | e5bcac6 | 2012-07-06 13:09:07 +0400 | [diff] [blame] | 324 | type = sysfs_ns_type(sd->s_parent); |
Andrew Morton | 17f79be | 2012-07-09 16:13:36 -0700 | [diff] [blame] | 325 | if (type != KOBJ_NS_TYPE_NONE && |
| 326 | sysfs_info(dentry->d_sb)->ns[type] != sd->s_ns) |
| 327 | goto out_bad; |
| 328 | } |
Glauber Costa | e5bcac6 | 2012-07-06 13:09:07 +0400 | [diff] [blame] | 329 | |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 330 | mutex_unlock(&sysfs_mutex); |
| 331 | out_valid: |
| 332 | return 1; |
| 333 | out_bad: |
| 334 | /* Remove the dentry from the dcache hashes. |
| 335 | * If this is a deleted dentry we use d_drop instead of d_delete |
| 336 | * so sysfs doesn't need to cope with negative dentries. |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 337 | * |
| 338 | * If this is a dentry that has simply been renamed we |
| 339 | * use d_drop to remove it from the dcache lookup on its |
| 340 | * old parent. If this dentry persists later when a lookup |
| 341 | * is performed at its new name the dentry will be readded |
| 342 | * to the dcache hashes. |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 343 | */ |
| 344 | is_dir = (sysfs_type(sd) == SYSFS_DIR); |
| 345 | mutex_unlock(&sysfs_mutex); |
| 346 | if (is_dir) { |
| 347 | /* If we have submounts we must allow the vfs caches |
| 348 | * to lie about the state of the filesystem to prevent |
| 349 | * leaks and other nasty things. |
| 350 | */ |
| 351 | if (have_submounts(dentry)) |
| 352 | goto out_valid; |
| 353 | shrink_dcache_parent(dentry); |
| 354 | } |
| 355 | d_drop(dentry); |
| 356 | return 0; |
| 357 | } |
| 358 | |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame] | 359 | static void sysfs_dentry_release(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame] | 361 | sysfs_put(dentry->d_fsdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame] | 364 | const struct dentry_operations sysfs_dentry_ops = { |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 365 | .d_revalidate = sysfs_dentry_revalidate, |
| 366 | .d_delete = sysfs_dentry_delete, |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame] | 367 | .d_release = sysfs_dentry_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | }; |
| 369 | |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 370 | 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] | 371 | { |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 372 | char *dup_name = NULL; |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 373 | struct sysfs_dirent *sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 374 | |
| 375 | if (type & SYSFS_COPY_NAME) { |
| 376 | name = dup_name = kstrdup(name, GFP_KERNEL); |
| 377 | if (!name) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 378 | return NULL; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 379 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 381 | sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | if (!sd) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 383 | goto err_out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 385 | if (sysfs_alloc_ino(&sd->s_ino)) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 386 | goto err_out2; |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | atomic_set(&sd->s_count, 1); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 389 | atomic_set(&sd->s_active, 0); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 390 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 391 | sd->s_name = name; |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 392 | sd->s_mode = mode; |
Ming Lei | bb2b005 | 2013-04-04 22:22:37 +0800 | [diff] [blame] | 393 | sd->s_flags = type | SYSFS_FLAG_REMOVED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | return sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 396 | |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 397 | err_out2: |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 398 | kmem_cache_free(sysfs_dir_cachep, sd); |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 399 | err_out1: |
| 400 | kfree(dup_name); |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 401 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
| 403 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 404 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 405 | * sysfs_addrm_start - prepare for sysfs_dirent add/remove |
| 406 | * @acxt: pointer to sysfs_addrm_cxt to be used |
| 407 | * @parent_sd: parent sysfs_dirent |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 408 | * |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 409 | * This function is called when the caller is about to add or |
| 410 | * remove sysfs_dirent under @parent_sd. This function acquires |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 411 | * sysfs_mutex. @acxt is used to keep and pass context to |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 412 | * other addrm functions. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 413 | * |
| 414 | * LOCKING: |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 415 | * Kernel thread context (may sleep). sysfs_mutex is locked on |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 416 | * return. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 417 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 418 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
| 419 | struct sysfs_dirent *parent_sd) |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 420 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 421 | memset(acxt, 0, sizeof(*acxt)); |
| 422 | acxt->parent_sd = parent_sd; |
| 423 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 424 | mutex_lock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | /** |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 428 | * __sysfs_add_one - add sysfs_dirent to parent without warning |
| 429 | * @acxt: addrm context to use |
| 430 | * @sd: sysfs_dirent to be added |
| 431 | * |
| 432 | * Get @acxt->parent_sd and set sd->s_parent to it and increment |
| 433 | * nlink of parent inode if @sd is a directory and link into the |
| 434 | * children list of the parent. |
| 435 | * |
| 436 | * This function should be called between calls to |
| 437 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 438 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 439 | * |
| 440 | * LOCKING: |
| 441 | * Determined by sysfs_addrm_start(). |
| 442 | * |
| 443 | * RETURNS: |
| 444 | * 0 on success, -EEXIST if entry with the given name already |
| 445 | * exists. |
| 446 | */ |
| 447 | int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 448 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 449 | struct sysfs_inode_attrs *ps_iattr; |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 450 | int ret; |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 451 | |
Eric W. Biederman | 903e21e | 2011-10-12 22:02:43 +0000 | [diff] [blame] | 452 | if (!!sysfs_ns_type(acxt->parent_sd) != !!sd->s_ns) { |
| 453 | WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n", |
| 454 | sysfs_ns_type(acxt->parent_sd)? "required": "invalid", |
| 455 | acxt->parent_sd->s_name, sd->s_name); |
| 456 | return -EINVAL; |
| 457 | } |
| 458 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 459 | sd->s_hash = sysfs_name_hash(sd->s_ns, sd->s_name); |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 460 | sd->s_parent = sysfs_get(acxt->parent_sd); |
| 461 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 462 | ret = sysfs_link_sibling(sd); |
| 463 | if (ret) |
| 464 | return ret; |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 465 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 466 | /* Update timestamps on the parent */ |
| 467 | ps_iattr = acxt->parent_sd->s_iattr; |
| 468 | if (ps_iattr) { |
| 469 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 470 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 471 | } |
| 472 | |
Ming Lei | bb2b005 | 2013-04-04 22:22:37 +0800 | [diff] [blame] | 473 | /* Mark the entry added into directory tree */ |
| 474 | sd->s_flags &= ~SYSFS_FLAG_REMOVED; |
| 475 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 476 | return 0; |
| 477 | } |
| 478 | |
| 479 | /** |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 480 | * sysfs_pathname - return full path to sysfs dirent |
| 481 | * @sd: sysfs_dirent whose path we want |
Geert Uytterhoeven | 66081a7 | 2012-09-29 22:23:19 +0200 | [diff] [blame] | 482 | * @path: caller allocated buffer of size PATH_MAX |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 483 | * |
| 484 | * Gives the name "/" to the sysfs_root entry; any path returned |
| 485 | * is relative to wherever sysfs is mounted. |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 486 | */ |
| 487 | static char *sysfs_pathname(struct sysfs_dirent *sd, char *path) |
| 488 | { |
| 489 | if (sd->s_parent) { |
| 490 | sysfs_pathname(sd->s_parent, path); |
Geert Uytterhoeven | 66081a7 | 2012-09-29 22:23:19 +0200 | [diff] [blame] | 491 | strlcat(path, "/", PATH_MAX); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 492 | } |
Geert Uytterhoeven | 66081a7 | 2012-09-29 22:23:19 +0200 | [diff] [blame] | 493 | strlcat(path, sd->s_name, PATH_MAX); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 494 | return path; |
| 495 | } |
| 496 | |
| 497 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 498 | * sysfs_add_one - add sysfs_dirent to parent |
| 499 | * @acxt: addrm context to use |
| 500 | * @sd: sysfs_dirent to be added |
| 501 | * |
| 502 | * 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] | 503 | * nlink of parent inode if @sd is a directory and link into the |
| 504 | * children list of the parent. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 505 | * |
| 506 | * This function should be called between calls to |
| 507 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 508 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 509 | * |
| 510 | * LOCKING: |
| 511 | * Determined by sysfs_addrm_start(). |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 512 | * |
| 513 | * RETURNS: |
| 514 | * 0 on success, -EEXIST if entry with the given name already |
| 515 | * exists. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 516 | */ |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 517 | 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] | 518 | { |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 519 | int ret; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 520 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 521 | ret = __sysfs_add_one(acxt, sd); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 522 | if (ret == -EEXIST) { |
| 523 | char *path = kzalloc(PATH_MAX, GFP_KERNEL); |
| 524 | WARN(1, KERN_WARNING |
| 525 | "sysfs: cannot create duplicate filename '%s'\n", |
Geert Uytterhoeven | 66081a7 | 2012-09-29 22:23:19 +0200 | [diff] [blame] | 526 | (path == NULL) ? sd->s_name |
| 527 | : (sysfs_pathname(acxt->parent_sd, path), |
| 528 | strlcat(path, "/", PATH_MAX), |
| 529 | strlcat(path, sd->s_name, PATH_MAX), |
| 530 | path)); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 531 | kfree(path); |
| 532 | } |
| 533 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 534 | return ret; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 535 | } |
| 536 | |
| 537 | /** |
| 538 | * sysfs_remove_one - remove sysfs_dirent from parent |
| 539 | * @acxt: addrm context to use |
Jean Delvare | 9fd5b1c | 2008-01-08 18:11:24 +0100 | [diff] [blame] | 540 | * @sd: sysfs_dirent to be removed |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 541 | * |
| 542 | * 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] | 543 | * directory. @sd is unlinked from the children list. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 544 | * |
| 545 | * This function should be called between calls to |
| 546 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 547 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 548 | * |
| 549 | * LOCKING: |
| 550 | * Determined by sysfs_addrm_start(). |
| 551 | */ |
| 552 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 553 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 554 | struct sysfs_inode_attrs *ps_iattr; |
| 555 | |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 556 | BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 557 | |
| 558 | sysfs_unlink_sibling(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 559 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 560 | /* Update timestamps on the parent */ |
| 561 | ps_iattr = acxt->parent_sd->s_iattr; |
| 562 | if (ps_iattr) { |
| 563 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 564 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 565 | } |
| 566 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 567 | sd->s_flags |= SYSFS_FLAG_REMOVED; |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 568 | sd->u.removed_list = acxt->removed; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 569 | acxt->removed = sd; |
Tejun Heo | a0edd7c | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 573 | * sysfs_addrm_finish - finish up sysfs_dirent add/remove |
| 574 | * @acxt: addrm context to finish up |
| 575 | * |
| 576 | * Finish up sysfs_dirent add/remove. Resources acquired by |
| 577 | * sysfs_addrm_start() are released and removed sysfs_dirents are |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 578 | * cleaned up. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 579 | * |
| 580 | * LOCKING: |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 581 | * sysfs_mutex is released. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 582 | */ |
Tejun Heo | 990e53f | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 583 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 584 | { |
| 585 | /* release resources acquired by sysfs_addrm_start() */ |
| 586 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 587 | |
| 588 | /* kill removed sysfs_dirents */ |
| 589 | while (acxt->removed) { |
| 590 | struct sysfs_dirent *sd = acxt->removed; |
| 591 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 592 | acxt->removed = sd->u.removed_list; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 593 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 594 | sysfs_deactivate(sd); |
Eric W. Biederman | e0edd3c | 2009-03-04 11:57:20 -0800 | [diff] [blame] | 595 | unmap_bin_file(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 596 | sysfs_put(sd); |
| 597 | } |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 598 | } |
| 599 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 600 | /** |
| 601 | * sysfs_find_dirent - find sysfs_dirent with the given name |
| 602 | * @parent_sd: sysfs_dirent to search under |
| 603 | * @name: name to look for |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 604 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 605 | * Look for sysfs_dirent with name @name under @parent_sd. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 606 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 607 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 608 | * mutex_lock(sysfs_mutex) |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 609 | * |
| 610 | * RETURNS: |
| 611 | * Pointer to sysfs_dirent if found, NULL if not. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 612 | */ |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 613 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 614 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 615 | const unsigned char *name) |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 616 | { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 617 | struct rb_node *node = parent_sd->s_dir.children.rb_node; |
| 618 | unsigned int hash; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 619 | |
Eric W. Biederman | 903e21e | 2011-10-12 22:02:43 +0000 | [diff] [blame] | 620 | if (!!sysfs_ns_type(parent_sd) != !!ns) { |
| 621 | WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n", |
| 622 | sysfs_ns_type(parent_sd)? "required": "invalid", |
| 623 | parent_sd->s_name, name); |
| 624 | return NULL; |
| 625 | } |
| 626 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 627 | hash = sysfs_name_hash(ns, name); |
| 628 | while (node) { |
| 629 | struct sysfs_dirent *sd; |
| 630 | int result; |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 631 | |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 632 | sd = to_sysfs_dirent(node); |
| 633 | result = sysfs_name_compare(hash, ns, name, sd); |
| 634 | if (result < 0) |
| 635 | node = node->rb_left; |
| 636 | else if (result > 0) |
| 637 | node = node->rb_right; |
| 638 | else |
| 639 | return sd; |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 640 | } |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 641 | return NULL; |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 642 | } |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 643 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 644 | /** |
| 645 | * sysfs_get_dirent - find and get sysfs_dirent with the given name |
| 646 | * @parent_sd: sysfs_dirent to search under |
| 647 | * @name: name to look for |
| 648 | * |
| 649 | * Look for sysfs_dirent with name @name under @parent_sd and get |
| 650 | * it if found. |
| 651 | * |
| 652 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 653 | * Kernel thread context (may sleep). Grabs sysfs_mutex. |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 654 | * |
| 655 | * RETURNS: |
| 656 | * Pointer to sysfs_dirent if found, NULL if not. |
| 657 | */ |
| 658 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 659 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 660 | const unsigned char *name) |
| 661 | { |
| 662 | struct sysfs_dirent *sd; |
| 663 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 664 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 665 | sd = sysfs_find_dirent(parent_sd, ns, name); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 666 | sysfs_get(sd); |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 667 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 668 | |
| 669 | return sd; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 670 | } |
Neil Brown | f1282c8 | 2008-07-16 08:58:04 +1000 | [diff] [blame] | 671 | EXPORT_SYMBOL_GPL(sysfs_get_dirent); |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 672 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 673 | 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] | 674 | enum kobj_ns_type type, const void *ns, const char *name, |
| 675 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 678 | struct sysfs_addrm_cxt acxt; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 679 | struct sysfs_dirent *sd; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 680 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 682 | /* allocate */ |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 683 | sd = sysfs_new_dirent(name, mode, SYSFS_DIR); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 684 | if (!sd) |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 685 | return -ENOMEM; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 686 | |
| 687 | sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT); |
| 688 | sd->s_ns = ns; |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 689 | sd->s_dir.kobj = kobj; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 690 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 691 | /* link in */ |
| 692 | sysfs_addrm_start(&acxt, parent_sd); |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 693 | rc = sysfs_add_one(&acxt, sd); |
| 694 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 695 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 696 | if (rc == 0) |
| 697 | *p_sd = sd; |
| 698 | else |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 699 | sysfs_put(sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 700 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 701 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | } |
| 703 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 704 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| 705 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 707 | return create_dir(kobj, kobj->sd, |
| 708 | KOBJ_NS_TYPE_NONE, NULL, name, p_sd); |
| 709 | } |
| 710 | |
Serge E. Hallyn | be867b1 | 2010-05-03 16:23:15 -0500 | [diff] [blame] | 711 | /** |
| 712 | * sysfs_read_ns_type: return associated ns_type |
| 713 | * @kobj: the kobject being queried |
| 714 | * |
| 715 | * Each kobject can be tagged with exactly one namespace type |
| 716 | * (i.e. network or user). Return the ns_type associated with |
| 717 | * this object if any |
| 718 | */ |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 719 | static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj) |
| 720 | { |
| 721 | const struct kobj_ns_type_operations *ops; |
| 722 | enum kobj_ns_type type; |
| 723 | |
| 724 | ops = kobj_child_ns_ops(kobj); |
| 725 | if (!ops) |
| 726 | return KOBJ_NS_TYPE_NONE; |
| 727 | |
| 728 | type = ops->type; |
| 729 | BUG_ON(type <= KOBJ_NS_TYPE_NONE); |
| 730 | BUG_ON(type >= KOBJ_NS_TYPES); |
| 731 | BUG_ON(!kobj_ns_type_registered(type)); |
| 732 | |
| 733 | return type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
| 736 | /** |
| 737 | * sysfs_create_dir - create a directory for an object. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | * @kobj: object we're creating directory for. |
| 739 | */ |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 740 | int sysfs_create_dir(struct kobject * kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 742 | enum kobj_ns_type type; |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 743 | struct sysfs_dirent *parent_sd, *sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 744 | const void *ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | int error = 0; |
| 746 | |
| 747 | BUG_ON(!kobj); |
| 748 | |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 749 | if (kobj->parent) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 750 | parent_sd = kobj->parent->sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | else |
Eric W. Biederman | 7d0c7d6 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 752 | parent_sd = &sysfs_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
Dan Williams | 3a19888 | 2012-04-06 13:41:06 -0700 | [diff] [blame] | 754 | if (!parent_sd) |
| 755 | return -ENOENT; |
| 756 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 757 | if (sysfs_ns_type(parent_sd)) |
| 758 | ns = kobj->ktype->namespace(kobj); |
| 759 | type = sysfs_read_ns_type(kobj); |
| 760 | |
| 761 | error = create_dir(kobj, parent_sd, type, ns, kobject_name(kobj), &sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | if (!error) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 763 | kobj->sd = sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | return error; |
| 765 | } |
| 766 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 768 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | { |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 770 | struct dentry *ret = NULL; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 771 | struct dentry *parent = dentry->d_parent; |
| 772 | struct sysfs_dirent *parent_sd = parent->d_fsdata; |
Tejun Heo | a7a0475 | 2007-08-02 21:38:02 +0900 | [diff] [blame] | 773 | struct sysfs_dirent *sd; |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 774 | struct inode *inode; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 775 | enum kobj_ns_type type; |
| 776 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 778 | mutex_lock(&sysfs_mutex); |
| 779 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 780 | type = sysfs_ns_type(parent_sd); |
| 781 | ns = sysfs_info(dir->i_sb)->ns[type]; |
| 782 | |
| 783 | sd = sysfs_find_dirent(parent_sd, ns, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 785 | /* no such entry */ |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 786 | if (!sd) { |
| 787 | ret = ERR_PTR(-ENOENT); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 788 | goto out_unlock; |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 789 | } |
Al Viro | 469796d | 2012-06-07 20:51:39 -0400 | [diff] [blame] | 790 | dentry->d_fsdata = sysfs_get(sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 791 | |
| 792 | /* attach dentry and inode */ |
Eric W. Biederman | fac2622 | 2010-02-12 19:22:27 -0800 | [diff] [blame] | 793 | inode = sysfs_get_inode(dir->i_sb, sd); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 794 | if (!inode) { |
| 795 | ret = ERR_PTR(-ENOMEM); |
| 796 | goto out_unlock; |
| 797 | } |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 798 | |
Tejun Heo | d6b4fd2 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 799 | /* instantiate and hash dentry */ |
Al Viro | e77fb7c | 2012-06-07 20:56:54 -0400 | [diff] [blame] | 800 | ret = d_materialise_unique(dentry, inode); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 801 | out_unlock: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 802 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 803 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | } |
| 805 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 806 | const struct inode_operations sysfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | .lookup = sysfs_lookup, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 808 | .permission = sysfs_permission, |
Maneesh Soni | 988d186 | 2005-05-31 10:39:14 +0530 | [diff] [blame] | 809 | .setattr = sysfs_setattr, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 810 | .getattr = sysfs_getattr, |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 811 | .setxattr = sysfs_setxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | }; |
| 813 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 814 | static void remove_dir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 816 | struct sysfs_addrm_cxt acxt; |
| 817 | |
| 818 | sysfs_addrm_start(&acxt, sd->s_parent); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 819 | sysfs_remove_one(&acxt, sd); |
| 820 | sysfs_addrm_finish(&acxt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | } |
| 822 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 823 | void sysfs_remove_subdir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 825 | remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | } |
| 827 | |
| 828 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 829 | static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 831 | struct sysfs_addrm_cxt acxt; |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 832 | struct rb_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 834 | if (!dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | return; |
| 836 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 837 | pr_debug("sysfs %s: removing dir\n", dir_sd->s_name); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 838 | sysfs_addrm_start(&acxt, dir_sd); |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 839 | pos = rb_first(&dir_sd->s_dir.children); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 840 | while (pos) { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 841 | struct sysfs_dirent *sd = to_sysfs_dirent(pos); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 842 | pos = rb_next(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 843 | if (sysfs_type(sd) != SYSFS_DIR) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 844 | sysfs_remove_one(&acxt, sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 846 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 847 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 848 | remove_dir(dir_sd); |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 849 | } |
| 850 | |
| 851 | /** |
| 852 | * sysfs_remove_dir - remove an object's directory. |
| 853 | * @kobj: object. |
| 854 | * |
| 855 | * The only thing special about this is that we remove any files in |
| 856 | * the directory before we remove the directory, and we've inlined |
| 857 | * what used to be sysfs_rmdir() below, instead of calling separately. |
| 858 | */ |
| 859 | |
| 860 | void sysfs_remove_dir(struct kobject * kobj) |
| 861 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 862 | struct sysfs_dirent *sd = kobj->sd; |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 863 | |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 864 | spin_lock(&sysfs_assoc_lock); |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 865 | kobj->sd = NULL; |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 866 | spin_unlock(&sysfs_assoc_lock); |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 867 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 868 | __sysfs_remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
| 870 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 871 | int sysfs_rename(struct sysfs_dirent *sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 872 | struct sysfs_dirent *new_parent_sd, const void *new_ns, |
| 873 | const char *new_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | { |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 875 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 877 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 932ea2e | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 878 | |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 879 | error = 0; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 880 | 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] | 881 | (strcmp(sd->s_name, new_name) == 0)) |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 882 | goto out; /* nothing to rename */ |
| 883 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 884 | error = -EEXIST; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 885 | if (sysfs_find_dirent(new_parent_sd, new_ns, new_name)) |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 886 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 887 | |
Eric W. Biederman | 0b4a4fe | 2008-07-03 18:05:28 -0700 | [diff] [blame] | 888 | /* rename sysfs_dirent */ |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 889 | if (strcmp(sd->s_name, new_name) != 0) { |
| 890 | error = -ENOMEM; |
Sasikantha babu | b4eafca | 2012-05-03 02:26:14 +0530 | [diff] [blame] | 891 | new_name = kstrdup(new_name, GFP_KERNEL); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 892 | if (!new_name) |
| 893 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 894 | |
Sasikantha babu | b4eafca | 2012-05-03 02:26:14 +0530 | [diff] [blame] | 895 | kfree(sd->s_name); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 896 | sd->s_name = new_name; |
| 897 | } |
| 898 | |
Eric W. Biederman | f6d90b4 | 2011-11-01 07:06:17 -0700 | [diff] [blame] | 899 | /* Move to the appropriate place in the appropriate directories rbtree. */ |
| 900 | sysfs_unlink_sibling(sd); |
| 901 | sysfs_get(new_parent_sd); |
| 902 | sysfs_put(sd->s_parent); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 903 | sd->s_ns = new_ns; |
Tom Goff | 70fa4a6 | 2012-04-04 12:06:20 -0700 | [diff] [blame] | 904 | 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] | 905 | sd->s_parent = new_parent_sd; |
| 906 | sysfs_link_sibling(sd); |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 907 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 908 | error = 0; |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 909 | out: |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 910 | mutex_unlock(&sysfs_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | return error; |
| 912 | } |
| 913 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 914 | int sysfs_rename_dir(struct kobject *kobj, const char *new_name) |
| 915 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 916 | struct sysfs_dirent *parent_sd = kobj->sd->s_parent; |
| 917 | const void *new_ns = NULL; |
| 918 | |
| 919 | if (sysfs_ns_type(parent_sd)) |
| 920 | new_ns = kobj->ktype->namespace(kobj); |
| 921 | |
| 922 | return sysfs_rename(kobj->sd, parent_sd, new_ns, new_name); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 923 | } |
| 924 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 925 | int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 926 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 927 | struct sysfs_dirent *sd = kobj->sd; |
| 928 | struct sysfs_dirent *new_parent_sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 929 | const void *new_ns = NULL; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 930 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 931 | BUG_ON(!sd->s_parent); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 932 | if (sysfs_ns_type(sd->s_parent)) |
| 933 | new_ns = kobj->ktype->namespace(kobj); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 934 | new_parent_sd = new_parent_kobj && new_parent_kobj->sd ? |
Cornelia Huck | a6a8357 | 2009-10-06 15:33:35 +0200 | [diff] [blame] | 935 | new_parent_kobj->sd : &sysfs_root; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 936 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 937 | return sysfs_rename(sd, new_parent_sd, new_ns, sd->s_name); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 938 | } |
| 939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | /* Relationship between s_mode and the DT_xxx types */ |
| 941 | static inline unsigned char dt_type(struct sysfs_dirent *sd) |
| 942 | { |
| 943 | return (sd->s_mode >> 12) & 15; |
| 944 | } |
| 945 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 946 | static int sysfs_dir_release(struct inode *inode, struct file *filp) |
| 947 | { |
| 948 | sysfs_put(filp->private_data); |
| 949 | return 0; |
| 950 | } |
| 951 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 952 | static struct sysfs_dirent *sysfs_dir_pos(const void *ns, |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 953 | 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] | 954 | { |
| 955 | if (pos) { |
| 956 | int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) && |
| 957 | pos->s_parent == parent_sd && |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 958 | hash == pos->s_hash; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 959 | sysfs_put(pos); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 960 | if (!valid) |
| 961 | pos = NULL; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 962 | } |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 963 | if (!pos && (hash > 1) && (hash < INT_MAX)) { |
| 964 | struct rb_node *node = parent_sd->s_dir.children.rb_node; |
| 965 | while (node) { |
| 966 | pos = to_sysfs_dirent(node); |
| 967 | |
| 968 | if (hash < pos->s_hash) |
| 969 | node = node->rb_left; |
| 970 | else if (hash > pos->s_hash) |
| 971 | node = node->rb_right; |
| 972 | else |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 973 | break; |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 974 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 975 | } |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 976 | /* Skip over entries in the wrong namespace */ |
Eric W. Biederman | b9e2780d | 2011-10-25 05:38:41 -0700 | [diff] [blame] | 977 | while (pos && pos->s_ns != ns) { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 978 | struct rb_node *node = rb_next(&pos->s_rb); |
| 979 | if (!node) |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 980 | pos = NULL; |
| 981 | else |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 982 | pos = to_sysfs_dirent(node); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 983 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 984 | return pos; |
| 985 | } |
| 986 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 987 | static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns, |
| 988 | 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] | 989 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 990 | pos = sysfs_dir_pos(ns, parent_sd, ino, pos); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 991 | if (pos) do { |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 992 | struct rb_node *node = rb_next(&pos->s_rb); |
| 993 | if (!node) |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame] | 994 | pos = NULL; |
| 995 | else |
Eric W. Biederman | 4e4d6d8 | 2011-12-18 20:05:43 -0800 | [diff] [blame] | 996 | pos = to_sysfs_dirent(node); |
Eric W. Biederman | b9e2780d | 2011-10-25 05:38:41 -0700 | [diff] [blame] | 997 | } while (pos && pos->s_ns != ns); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 998 | return pos; |
| 999 | } |
| 1000 | |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1001 | static int sysfs_readdir(struct file *file, struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | { |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1003 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | struct sysfs_dirent * parent_sd = dentry->d_fsdata; |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1005 | struct sysfs_dirent *pos = file->private_data; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1006 | enum kobj_ns_type type; |
| 1007 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1009 | type = sysfs_ns_type(parent_sd); |
| 1010 | ns = sysfs_info(dentry->d_sb)->ns[type]; |
| 1011 | |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1012 | if (!dir_emit_dots(file, ctx)) |
| 1013 | return 0; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1014 | mutex_lock(&sysfs_mutex); |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1015 | for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1016 | pos; |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1017 | pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) { |
| 1018 | const char *name = pos->s_name; |
| 1019 | unsigned int type = dt_type(pos); |
| 1020 | int len = strlen(name); |
| 1021 | ino_t ino = pos->s_ino; |
| 1022 | ctx->pos = pos->s_hash; |
| 1023 | file->private_data = sysfs_get(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1024 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 1025 | mutex_unlock(&sysfs_mutex); |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1026 | if (!dir_emit(ctx, name, len, ino, type)) |
| 1027 | return 0; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1028 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1029 | } |
| 1030 | mutex_unlock(&sysfs_mutex); |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1031 | file->private_data = NULL; |
| 1032 | ctx->pos = INT_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | return 0; |
| 1034 | } |
| 1035 | |
Ming Lei | 991f76f | 2013-03-20 23:25:24 +0800 | [diff] [blame] | 1036 | static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence) |
| 1037 | { |
| 1038 | struct inode *inode = file_inode(file); |
| 1039 | loff_t ret; |
| 1040 | |
| 1041 | mutex_lock(&inode->i_mutex); |
| 1042 | ret = generic_file_llseek(file, offset, whence); |
| 1043 | mutex_unlock(&inode->i_mutex); |
| 1044 | |
| 1045 | return ret; |
| 1046 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1048 | const struct file_operations sysfs_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | .read = generic_read_dir, |
Al Viro | d55fea8 | 2013-05-16 14:31:02 -0400 | [diff] [blame] | 1050 | .iterate = sysfs_readdir, |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1051 | .release = sysfs_dir_release, |
Ming Lei | 991f76f | 2013-03-20 23:25:24 +0800 | [diff] [blame] | 1052 | .llseek = sysfs_dir_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | }; |