Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Tejun Heo | 6d66f5c | 2007-09-20 17:31:38 +0900 | [diff] [blame] | 2 | * fs/sysfs/dir.c - sysfs core and dir operation implementation |
| 3 | * |
| 4 | * Copyright (c) 2001-3 Patrick Mochel |
| 5 | * Copyright (c) 2007 SUSE Linux Products GmbH |
| 6 | * Copyright (c) 2007 Tejun Heo <teheo@suse.de> |
| 7 | * |
| 8 | * This file is released under the GPLv2. |
| 9 | * |
| 10 | * Please see Documentation/filesystems/sysfs.txt for more information. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | #undef DEBUG |
| 14 | |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/mount.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kobject.h> |
Christoph Hellwig | 5f45f1a | 2005-06-23 00:09:12 -0700 | [diff] [blame] | 19 | #include <linux/namei.h> |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 20 | #include <linux/idr.h> |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 21 | #include <linux/completion.h> |
Dave Young | 869512a | 2007-07-26 14:53:53 +0000 | [diff] [blame] | 22 | #include <linux/mutex.h> |
Robert P. J. Day | c6f8773 | 2008-03-13 22:41:52 -0400 | [diff] [blame] | 23 | #include <linux/slab.h> |
Eric W. Biederman | 4c3da22 | 2009-11-04 02:50:06 -0800 | [diff] [blame] | 24 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "sysfs.h" |
| 26 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 27 | DEFINE_MUTEX(sysfs_mutex); |
Roel Kluin | f7a75f0 | 2007-10-16 23:30:25 -0700 | [diff] [blame] | 28 | DEFINE_SPINLOCK(sysfs_assoc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Roel Kluin | f7a75f0 | 2007-10-16 23:30:25 -0700 | [diff] [blame] | 30 | static DEFINE_SPINLOCK(sysfs_ino_lock); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 31 | static DEFINE_IDA(sysfs_ino_ida); |
| 32 | |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 33 | /** |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 34 | * sysfs_link_sibling - link sysfs_dirent into sibling list |
| 35 | * @sd: sysfs_dirent of interest |
| 36 | * |
| 37 | * Link @sd into its sibling list which starts from |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 38 | * sd->s_parent->s_dir.children. |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 39 | * |
| 40 | * Locking: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 41 | * mutex_lock(sysfs_mutex) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 42 | */ |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 43 | static void sysfs_link_sibling(struct sysfs_dirent *sd) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 44 | { |
| 45 | struct sysfs_dirent *parent_sd = sd->s_parent; |
| 46 | |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 47 | struct rb_node **p; |
| 48 | struct rb_node *parent; |
| 49 | |
Mikulas Patocka | 7f9838f | 2011-07-21 19:59:22 -0400 | [diff] [blame] | 50 | if (sysfs_type(sd) == SYSFS_DIR) |
| 51 | parent_sd->s_dir.subdirs++; |
| 52 | |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 53 | p = &parent_sd->s_dir.inode_tree.rb_node; |
| 54 | parent = NULL; |
| 55 | while (*p) { |
| 56 | parent = *p; |
| 57 | #define node rb_entry(parent, struct sysfs_dirent, inode_node) |
| 58 | if (sd->s_ino < node->s_ino) { |
| 59 | p = &node->inode_node.rb_left; |
| 60 | } else if (sd->s_ino > node->s_ino) { |
| 61 | p = &node->inode_node.rb_right; |
| 62 | } else { |
| 63 | printk(KERN_CRIT "sysfs: inserting duplicate inode '%lx'\n", sd->s_ino); |
| 64 | BUG(); |
| 65 | } |
| 66 | #undef node |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 67 | } |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 68 | rb_link_node(&sd->inode_node, parent, p); |
| 69 | rb_insert_color(&sd->inode_node, &parent_sd->s_dir.inode_tree); |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 70 | |
| 71 | p = &parent_sd->s_dir.name_tree.rb_node; |
| 72 | parent = NULL; |
| 73 | while (*p) { |
| 74 | int c; |
| 75 | parent = *p; |
| 76 | #define node rb_entry(parent, struct sysfs_dirent, name_node) |
| 77 | c = strcmp(sd->s_name, node->s_name); |
| 78 | if (c < 0) { |
| 79 | p = &node->name_node.rb_left; |
| 80 | } else { |
| 81 | p = &node->name_node.rb_right; |
| 82 | } |
| 83 | #undef node |
| 84 | } |
| 85 | rb_link_node(&sd->name_node, parent, p); |
| 86 | rb_insert_color(&sd->name_node, &parent_sd->s_dir.name_tree); |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | /** |
| 90 | * sysfs_unlink_sibling - unlink sysfs_dirent from sibling list |
| 91 | * @sd: sysfs_dirent of interest |
| 92 | * |
| 93 | * Unlink @sd from its sibling list which starts from |
Tejun Heo | bc747f3 | 2007-09-20 16:05:12 +0900 | [diff] [blame] | 94 | * sd->s_parent->s_dir.children. |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 95 | * |
| 96 | * Locking: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 97 | * mutex_lock(sysfs_mutex) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 98 | */ |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 99 | static void sysfs_unlink_sibling(struct sysfs_dirent *sd) |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 100 | { |
Mikulas Patocka | 7f9838f | 2011-07-21 19:59:22 -0400 | [diff] [blame] | 101 | if (sysfs_type(sd) == SYSFS_DIR) |
| 102 | sd->s_parent->s_dir.subdirs--; |
| 103 | |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 104 | rb_erase(&sd->inode_node, &sd->s_parent->s_dir.inode_tree); |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 105 | rb_erase(&sd->name_node, &sd->s_parent->s_dir.name_tree); |
Tejun Heo | 0c73f18 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | /** |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 109 | * sysfs_get_active - get an active reference to sysfs_dirent |
| 110 | * @sd: sysfs_dirent to get an active reference to |
| 111 | * |
| 112 | * Get an active reference of @sd. This function is noop if @sd |
| 113 | * is NULL. |
| 114 | * |
| 115 | * RETURNS: |
| 116 | * Pointer to @sd on success, NULL on failure. |
| 117 | */ |
Eric W. Biederman | e72ceb8 | 2010-02-11 15:18:38 -0800 | [diff] [blame] | 118 | struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 119 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 120 | if (unlikely(!sd)) |
| 121 | return NULL; |
| 122 | |
| 123 | while (1) { |
| 124 | int v, t; |
| 125 | |
| 126 | v = atomic_read(&sd->s_active); |
| 127 | if (unlikely(v < 0)) |
| 128 | return NULL; |
| 129 | |
| 130 | t = atomic_cmpxchg(&sd->s_active, v, v + 1); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 131 | if (likely(t == v)) { |
| 132 | rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 133 | return sd; |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 134 | } |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 135 | if (t < 0) |
| 136 | return NULL; |
| 137 | |
| 138 | cpu_relax(); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 139 | } |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | /** |
| 143 | * sysfs_put_active - put an active reference to sysfs_dirent |
| 144 | * @sd: sysfs_dirent to put an active reference to |
| 145 | * |
| 146 | * Put an active reference to @sd. This function is noop if @sd |
| 147 | * is NULL. |
| 148 | */ |
Eric W. Biederman | e72ceb8 | 2010-02-11 15:18:38 -0800 | [diff] [blame] | 149 | void sysfs_put_active(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 150 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 151 | int v; |
| 152 | |
| 153 | if (unlikely(!sd)) |
| 154 | return; |
| 155 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 156 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 157 | v = atomic_dec_return(&sd->s_active); |
| 158 | if (likely(v != SD_DEACTIVATED_BIAS)) |
| 159 | return; |
| 160 | |
| 161 | /* atomic_dec_return() is a mb(), we'll always see the updated |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 162 | * sd->u.completion. |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 163 | */ |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 164 | complete(sd->u.completion); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | /** |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 168 | * sysfs_deactivate - deactivate sysfs_dirent |
| 169 | * @sd: sysfs_dirent to deactivate |
| 170 | * |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 171 | * Deny new active references and drain existing ones. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 172 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 173 | static void sysfs_deactivate(struct sysfs_dirent *sd) |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 174 | { |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 175 | DECLARE_COMPLETION_ONSTACK(wait); |
| 176 | int v; |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 177 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 178 | BUG_ON(!(sd->s_flags & SYSFS_FLAG_REMOVED)); |
Eric W. Biederman | a2db684 | 2010-02-11 15:20:00 -0800 | [diff] [blame] | 179 | |
| 180 | if (!(sysfs_type(sd) & SYSFS_ACTIVE_REF)) |
| 181 | return; |
| 182 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 183 | sd->u.completion = (void *)&wait; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 184 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 185 | rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 186 | /* atomic_add_return() is a mb(), put_active() will always see |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 187 | * the updated sd->u.completion. |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 188 | */ |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 189 | v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active); |
| 190 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 191 | if (v != SD_DEACTIVATED_BIAS) { |
| 192 | lock_contended(&sd->dep_map, _RET_IP_); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 193 | wait_for_completion(&wait); |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 194 | } |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 195 | |
Eric W. Biederman | 846f997 | 2010-01-02 13:37:12 -0800 | [diff] [blame] | 196 | lock_acquired(&sd->dep_map, _RET_IP_); |
| 197 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 198 | } |
| 199 | |
Tejun Heo | 42b37df | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 200 | static int sysfs_alloc_ino(ino_t *pino) |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 201 | { |
| 202 | int ino, rc; |
| 203 | |
| 204 | retry: |
| 205 | spin_lock(&sysfs_ino_lock); |
| 206 | rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino); |
| 207 | spin_unlock(&sysfs_ino_lock); |
| 208 | |
| 209 | if (rc == -EAGAIN) { |
| 210 | if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL)) |
| 211 | goto retry; |
| 212 | rc = -ENOMEM; |
| 213 | } |
| 214 | |
| 215 | *pino = ino; |
| 216 | return rc; |
| 217 | } |
| 218 | |
| 219 | static void sysfs_free_ino(ino_t ino) |
| 220 | { |
| 221 | spin_lock(&sysfs_ino_lock); |
| 222 | ida_remove(&sysfs_ino_ida, ino); |
| 223 | spin_unlock(&sysfs_ino_lock); |
| 224 | } |
| 225 | |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 226 | void release_sysfs_dirent(struct sysfs_dirent * sd) |
| 227 | { |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 228 | struct sysfs_dirent *parent_sd; |
| 229 | |
| 230 | repeat: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 231 | /* Moving/renaming is always done while holding reference. |
| 232 | * sd->s_parent won't change beneath us. |
| 233 | */ |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 234 | parent_sd = sd->s_parent; |
| 235 | |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 236 | if (sysfs_type(sd) == SYSFS_KOBJ_LINK) |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 237 | sysfs_put(sd->s_symlink.target_sd); |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 238 | if (sysfs_type(sd) & SYSFS_COPY_NAME) |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 239 | kfree(sd->s_name); |
Eric W. Biederman | 4c3da22 | 2009-11-04 02:50:06 -0800 | [diff] [blame] | 240 | if (sd->s_iattr && sd->s_iattr->ia_secdata) |
| 241 | security_release_secctx(sd->s_iattr->ia_secdata, |
| 242 | sd->s_iattr->ia_secdata_len); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 243 | kfree(sd->s_iattr); |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 244 | sysfs_free_ino(sd->s_ino); |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 245 | kmem_cache_free(sysfs_dir_cachep, sd); |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 246 | |
| 247 | sd = parent_sd; |
| 248 | if (sd && atomic_dec_and_test(&sd->s_count)) |
| 249 | goto repeat; |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 250 | } |
| 251 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 252 | static int sysfs_dentry_delete(const struct dentry *dentry) |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 253 | { |
| 254 | struct sysfs_dirent *sd = dentry->d_fsdata; |
| 255 | return !!(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 256 | } |
| 257 | |
| 258 | static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 259 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 260 | struct sysfs_dirent *sd; |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 261 | int is_dir; |
| 262 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 263 | if (nd->flags & LOOKUP_RCU) |
| 264 | return -ECHILD; |
| 265 | |
| 266 | sd = dentry->d_fsdata; |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 267 | mutex_lock(&sysfs_mutex); |
| 268 | |
| 269 | /* The sysfs dirent has been deleted */ |
| 270 | if (sd->s_flags & SYSFS_FLAG_REMOVED) |
| 271 | goto out_bad; |
| 272 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 273 | /* The sysfs dirent has been moved? */ |
| 274 | if (dentry->d_parent->d_fsdata != sd->s_parent) |
| 275 | goto out_bad; |
| 276 | |
| 277 | /* The sysfs dirent has been renamed */ |
| 278 | if (strcmp(dentry->d_name.name, sd->s_name) != 0) |
| 279 | goto out_bad; |
| 280 | |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 281 | mutex_unlock(&sysfs_mutex); |
| 282 | out_valid: |
| 283 | return 1; |
| 284 | out_bad: |
| 285 | /* Remove the dentry from the dcache hashes. |
| 286 | * If this is a deleted dentry we use d_drop instead of d_delete |
| 287 | * so sysfs doesn't need to cope with negative dentries. |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 288 | * |
| 289 | * If this is a dentry that has simply been renamed we |
| 290 | * use d_drop to remove it from the dcache lookup on its |
| 291 | * old parent. If this dentry persists later when a lookup |
| 292 | * is performed at its new name the dentry will be readded |
| 293 | * to the dcache hashes. |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 294 | */ |
| 295 | is_dir = (sysfs_type(sd) == SYSFS_DIR); |
| 296 | mutex_unlock(&sysfs_mutex); |
| 297 | if (is_dir) { |
| 298 | /* If we have submounts we must allow the vfs caches |
| 299 | * to lie about the state of the filesystem to prevent |
| 300 | * leaks and other nasty things. |
| 301 | */ |
| 302 | if (have_submounts(dentry)) |
| 303 | goto out_valid; |
| 304 | shrink_dcache_parent(dentry); |
| 305 | } |
| 306 | d_drop(dentry); |
| 307 | return 0; |
| 308 | } |
| 309 | |
Eric W. Biederman | 28a027c | 2009-11-07 23:27:00 -0800 | [diff] [blame] | 310 | static void sysfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | { |
| 312 | struct sysfs_dirent * sd = dentry->d_fsdata; |
| 313 | |
Eric W. Biederman | 5a26b79 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 314 | sysfs_put(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | iput(inode); |
| 316 | } |
| 317 | |
Al Viro | ee1ec32 | 2009-02-20 06:01:46 +0000 | [diff] [blame] | 318 | static const struct dentry_operations sysfs_dentry_ops = { |
Eric W. Biederman | e8f077c | 2009-11-07 23:27:01 -0800 | [diff] [blame] | 319 | .d_revalidate = sysfs_dentry_revalidate, |
| 320 | .d_delete = sysfs_dentry_delete, |
Eric W. Biederman | 28a027c | 2009-11-07 23:27:00 -0800 | [diff] [blame] | 321 | .d_iput = sysfs_dentry_iput, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | }; |
| 323 | |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 324 | 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] | 325 | { |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 326 | char *dup_name = NULL; |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 327 | struct sysfs_dirent *sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 328 | |
| 329 | if (type & SYSFS_COPY_NAME) { |
| 330 | name = dup_name = kstrdup(name, GFP_KERNEL); |
| 331 | if (!name) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 332 | return NULL; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 333 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 335 | sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | if (!sd) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 337 | goto err_out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 339 | if (sysfs_alloc_ino(&sd->s_ino)) |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 340 | goto err_out2; |
Tejun Heo | 2b611bb | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | atomic_set(&sd->s_count, 1); |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 343 | atomic_set(&sd->s_active, 0); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 344 | |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 345 | sd->s_name = name; |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 346 | sd->s_mode = mode; |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 347 | sd->s_flags = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
| 349 | return sd; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 350 | |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 351 | err_out2: |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 352 | kmem_cache_free(sysfs_dir_cachep, sd); |
Akinobu Mita | 01da242 | 2007-07-14 11:03:35 +0900 | [diff] [blame] | 353 | err_out1: |
| 354 | kfree(dup_name); |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 355 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 358 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 359 | * sysfs_addrm_start - prepare for sysfs_dirent add/remove |
| 360 | * @acxt: pointer to sysfs_addrm_cxt to be used |
| 361 | * @parent_sd: parent sysfs_dirent |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 362 | * |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 363 | * This function is called when the caller is about to add or |
| 364 | * remove sysfs_dirent under @parent_sd. This function acquires |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 365 | * sysfs_mutex. @acxt is used to keep and pass context to |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 366 | * other addrm functions. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 367 | * |
| 368 | * LOCKING: |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 369 | * Kernel thread context (may sleep). sysfs_mutex is locked on |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 370 | * return. |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 371 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 372 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
| 373 | struct sysfs_dirent *parent_sd) |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 374 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 375 | memset(acxt, 0, sizeof(*acxt)); |
| 376 | acxt->parent_sd = parent_sd; |
| 377 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 378 | mutex_lock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | /** |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 382 | * __sysfs_add_one - add sysfs_dirent to parent without warning |
| 383 | * @acxt: addrm context to use |
| 384 | * @sd: sysfs_dirent to be added |
| 385 | * |
| 386 | * Get @acxt->parent_sd and set sd->s_parent to it and increment |
| 387 | * nlink of parent inode if @sd is a directory and link into the |
| 388 | * children list of the parent. |
| 389 | * |
| 390 | * This function should be called between calls to |
| 391 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 392 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 393 | * |
| 394 | * LOCKING: |
| 395 | * Determined by sysfs_addrm_start(). |
| 396 | * |
| 397 | * RETURNS: |
| 398 | * 0 on success, -EEXIST if entry with the given name already |
| 399 | * exists. |
| 400 | */ |
| 401 | int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 402 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 403 | struct sysfs_inode_attrs *ps_iattr; |
| 404 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 405 | if (sysfs_find_dirent(acxt->parent_sd, sd->s_ns, sd->s_name)) |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 406 | return -EEXIST; |
| 407 | |
| 408 | sd->s_parent = sysfs_get(acxt->parent_sd); |
| 409 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 410 | sysfs_link_sibling(sd); |
| 411 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 412 | /* Update timestamps on the parent */ |
| 413 | ps_iattr = acxt->parent_sd->s_iattr; |
| 414 | if (ps_iattr) { |
| 415 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 416 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 417 | } |
| 418 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | /** |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 423 | * sysfs_pathname - return full path to sysfs dirent |
| 424 | * @sd: sysfs_dirent whose path we want |
| 425 | * @path: caller allocated buffer |
| 426 | * |
| 427 | * Gives the name "/" to the sysfs_root entry; any path returned |
| 428 | * is relative to wherever sysfs is mounted. |
| 429 | * |
| 430 | * XXX: does no error checking on @path size |
| 431 | */ |
| 432 | static char *sysfs_pathname(struct sysfs_dirent *sd, char *path) |
| 433 | { |
| 434 | if (sd->s_parent) { |
| 435 | sysfs_pathname(sd->s_parent, path); |
| 436 | strcat(path, "/"); |
| 437 | } |
| 438 | strcat(path, sd->s_name); |
| 439 | return path; |
| 440 | } |
| 441 | |
| 442 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 443 | * sysfs_add_one - add sysfs_dirent to parent |
| 444 | * @acxt: addrm context to use |
| 445 | * @sd: sysfs_dirent to be added |
| 446 | * |
| 447 | * 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] | 448 | * nlink of parent inode if @sd is a directory and link into the |
| 449 | * children list of the parent. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 450 | * |
| 451 | * This function should be called between calls to |
| 452 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 453 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 454 | * |
| 455 | * LOCKING: |
| 456 | * Determined by sysfs_addrm_start(). |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 457 | * |
| 458 | * RETURNS: |
| 459 | * 0 on success, -EEXIST if entry with the given name already |
| 460 | * exists. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 461 | */ |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 462 | 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] | 463 | { |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 464 | int ret; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 465 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 466 | ret = __sysfs_add_one(acxt, sd); |
Alex Chiang | 425cb02 | 2009-02-12 10:56:59 -0700 | [diff] [blame] | 467 | if (ret == -EEXIST) { |
| 468 | char *path = kzalloc(PATH_MAX, GFP_KERNEL); |
| 469 | WARN(1, KERN_WARNING |
| 470 | "sysfs: cannot create duplicate filename '%s'\n", |
| 471 | (path == NULL) ? sd->s_name : |
| 472 | strcat(strcat(sysfs_pathname(acxt->parent_sd, path), "/"), |
| 473 | sd->s_name)); |
| 474 | kfree(path); |
| 475 | } |
| 476 | |
Cornelia Huck | 36ce6da | 2008-06-10 11:09:08 +0200 | [diff] [blame] | 477 | return ret; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | /** |
| 481 | * sysfs_remove_one - remove sysfs_dirent from parent |
| 482 | * @acxt: addrm context to use |
Jean Delvare | 9fd5b1c | 2008-01-08 18:11:24 +0100 | [diff] [blame] | 483 | * @sd: sysfs_dirent to be removed |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 484 | * |
| 485 | * 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] | 486 | * directory. @sd is unlinked from the children list. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 487 | * |
| 488 | * This function should be called between calls to |
| 489 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be |
| 490 | * passed the same @acxt as passed to sysfs_addrm_start(). |
| 491 | * |
| 492 | * LOCKING: |
| 493 | * Determined by sysfs_addrm_start(). |
| 494 | */ |
| 495 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
| 496 | { |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 497 | struct sysfs_inode_attrs *ps_iattr; |
| 498 | |
Tejun Heo | 41fc1c2 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 499 | BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED); |
| 500 | |
| 501 | sysfs_unlink_sibling(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 502 | |
Eric W. Biederman | 6b0bfe9 | 2009-11-20 16:08:51 -0800 | [diff] [blame] | 503 | /* Update timestamps on the parent */ |
| 504 | ps_iattr = acxt->parent_sd->s_iattr; |
| 505 | if (ps_iattr) { |
| 506 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; |
| 507 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; |
| 508 | } |
| 509 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 510 | sd->s_flags |= SYSFS_FLAG_REMOVED; |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 511 | sd->u.removed_list = acxt->removed; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 512 | acxt->removed = sd; |
Tejun Heo | a0edd7c | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 513 | } |
| 514 | |
| 515 | /** |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 516 | * sysfs_addrm_finish - finish up sysfs_dirent add/remove |
| 517 | * @acxt: addrm context to finish up |
| 518 | * |
| 519 | * Finish up sysfs_dirent add/remove. Resources acquired by |
| 520 | * sysfs_addrm_start() are released and removed sysfs_dirents are |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 521 | * cleaned up. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 522 | * |
| 523 | * LOCKING: |
Eric W. Biederman | a16bbc3 | 2009-11-20 16:08:55 -0800 | [diff] [blame] | 524 | * sysfs_mutex is released. |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 525 | */ |
Tejun Heo | 990e53f | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 526 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 527 | { |
| 528 | /* release resources acquired by sysfs_addrm_start() */ |
| 529 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 530 | |
| 531 | /* kill removed sysfs_dirents */ |
| 532 | while (acxt->removed) { |
| 533 | struct sysfs_dirent *sd = acxt->removed; |
| 534 | |
Mikulas Patocka | 58f2a4c | 2011-07-21 20:01:12 -0400 | [diff] [blame] | 535 | acxt->removed = sd->u.removed_list; |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 536 | |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 537 | sysfs_deactivate(sd); |
Eric W. Biederman | e0edd3c | 2009-03-04 11:57:20 -0800 | [diff] [blame] | 538 | unmap_bin_file(sd); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 539 | sysfs_put(sd); |
| 540 | } |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 541 | } |
| 542 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 543 | /** |
| 544 | * sysfs_find_dirent - find sysfs_dirent with the given name |
| 545 | * @parent_sd: sysfs_dirent to search under |
| 546 | * @name: name to look for |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 547 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 548 | * Look for sysfs_dirent with name @name under @parent_sd. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 549 | * |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 550 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 551 | * mutex_lock(sysfs_mutex) |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 552 | * |
| 553 | * RETURNS: |
| 554 | * Pointer to sysfs_dirent if found, NULL if not. |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 555 | */ |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 556 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 557 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 558 | const unsigned char *name) |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 559 | { |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 560 | struct rb_node *p = parent_sd->s_dir.name_tree.rb_node; |
| 561 | struct sysfs_dirent *found = NULL; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 562 | |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 563 | while (p) { |
| 564 | int c; |
| 565 | #define node rb_entry(p, struct sysfs_dirent, name_node) |
| 566 | c = strcmp(name, node->s_name); |
| 567 | if (c < 0) { |
| 568 | p = node->name_node.rb_left; |
| 569 | } else if (c > 0) { |
| 570 | p = node->name_node.rb_right; |
| 571 | } else { |
| 572 | found = node; |
| 573 | p = node->name_node.rb_left; |
| 574 | } |
| 575 | #undef node |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 576 | } |
Mikulas Patocka | 4f72c0c | 2011-07-25 17:55:57 -0400 | [diff] [blame] | 577 | |
| 578 | if (found && ns) { |
| 579 | while (found->s_ns && found->s_ns != ns) { |
| 580 | p = rb_next(&found->name_node); |
| 581 | if (!p) |
| 582 | return NULL; |
| 583 | found = rb_entry(p, struct sysfs_dirent, name_node); |
| 584 | if (strcmp(name, found->s_name)) |
| 585 | return NULL; |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | return found; |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 590 | } |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 591 | |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 592 | /** |
| 593 | * sysfs_get_dirent - find and get sysfs_dirent with the given name |
| 594 | * @parent_sd: sysfs_dirent to search under |
| 595 | * @name: name to look for |
| 596 | * |
| 597 | * Look for sysfs_dirent with name @name under @parent_sd and get |
| 598 | * it if found. |
| 599 | * |
| 600 | * LOCKING: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 601 | * Kernel thread context (may sleep). Grabs sysfs_mutex. |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 602 | * |
| 603 | * RETURNS: |
| 604 | * Pointer to sysfs_dirent if found, NULL if not. |
| 605 | */ |
| 606 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 607 | const void *ns, |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 608 | const unsigned char *name) |
| 609 | { |
| 610 | struct sysfs_dirent *sd; |
| 611 | |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 612 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 613 | sd = sysfs_find_dirent(parent_sd, ns, name); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 614 | sysfs_get(sd); |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 615 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | f0b0af4 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 616 | |
| 617 | return sd; |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 618 | } |
Neil Brown | f1282c8 | 2008-07-16 08:58:04 +1000 | [diff] [blame] | 619 | EXPORT_SYMBOL_GPL(sysfs_get_dirent); |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 620 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 621 | 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] | 622 | enum kobj_ns_type type, const void *ns, const char *name, |
| 623 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 626 | struct sysfs_addrm_cxt acxt; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 627 | struct sysfs_dirent *sd; |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 628 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 630 | /* allocate */ |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 631 | sd = sysfs_new_dirent(name, mode, SYSFS_DIR); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 632 | if (!sd) |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 633 | return -ENOMEM; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 634 | |
| 635 | sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT); |
| 636 | sd->s_ns = ns; |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 637 | sd->s_dir.kobj = kobj; |
Tejun Heo | dfeb9fb | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 638 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 639 | /* link in */ |
| 640 | sysfs_addrm_start(&acxt, parent_sd); |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 641 | rc = sysfs_add_one(&acxt, sd); |
| 642 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 643 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 644 | if (rc == 0) |
| 645 | *p_sd = sd; |
| 646 | else |
Tejun Heo | 967e35d | 2007-07-18 16:38:11 +0900 | [diff] [blame] | 647 | sysfs_put(sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 648 | |
Tejun Heo | 23dc279 | 2007-08-02 21:38:03 +0900 | [diff] [blame] | 649 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | } |
| 651 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 652 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| 653 | struct sysfs_dirent **p_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 655 | return create_dir(kobj, kobj->sd, |
| 656 | KOBJ_NS_TYPE_NONE, NULL, name, p_sd); |
| 657 | } |
| 658 | |
Serge E. Hallyn | be867b1 | 2010-05-03 16:23:15 -0500 | [diff] [blame] | 659 | /** |
| 660 | * sysfs_read_ns_type: return associated ns_type |
| 661 | * @kobj: the kobject being queried |
| 662 | * |
| 663 | * Each kobject can be tagged with exactly one namespace type |
| 664 | * (i.e. network or user). Return the ns_type associated with |
| 665 | * this object if any |
| 666 | */ |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 667 | static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj) |
| 668 | { |
| 669 | const struct kobj_ns_type_operations *ops; |
| 670 | enum kobj_ns_type type; |
| 671 | |
| 672 | ops = kobj_child_ns_ops(kobj); |
| 673 | if (!ops) |
| 674 | return KOBJ_NS_TYPE_NONE; |
| 675 | |
| 676 | type = ops->type; |
| 677 | BUG_ON(type <= KOBJ_NS_TYPE_NONE); |
| 678 | BUG_ON(type >= KOBJ_NS_TYPES); |
| 679 | BUG_ON(!kobj_ns_type_registered(type)); |
| 680 | |
| 681 | return type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |
| 683 | |
| 684 | /** |
| 685 | * sysfs_create_dir - create a directory for an object. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | * @kobj: object we're creating directory for. |
| 687 | */ |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 688 | int sysfs_create_dir(struct kobject * kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 690 | enum kobj_ns_type type; |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 691 | struct sysfs_dirent *parent_sd, *sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 692 | const void *ns = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | int error = 0; |
| 694 | |
| 695 | BUG_ON(!kobj); |
| 696 | |
Eric W. Biederman | 90bc613 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 697 | if (kobj->parent) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 698 | parent_sd = kobj->parent->sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | else |
Eric W. Biederman | 7d0c7d6 | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 700 | parent_sd = &sysfs_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 702 | if (sysfs_ns_type(parent_sd)) |
| 703 | ns = kobj->ktype->namespace(kobj); |
| 704 | type = sysfs_read_ns_type(kobj); |
| 705 | |
| 706 | error = create_dir(kobj, parent_sd, type, ns, kobject_name(kobj), &sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | if (!error) |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 708 | kobj->sd = sd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | return error; |
| 710 | } |
| 711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, |
| 713 | struct nameidata *nd) |
| 714 | { |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 715 | struct dentry *ret = NULL; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 716 | struct dentry *parent = dentry->d_parent; |
| 717 | struct sysfs_dirent *parent_sd = parent->d_fsdata; |
Tejun Heo | a7a0475 | 2007-08-02 21:38:02 +0900 | [diff] [blame] | 718 | struct sysfs_dirent *sd; |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 719 | struct inode *inode; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 720 | enum kobj_ns_type type; |
| 721 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 723 | mutex_lock(&sysfs_mutex); |
| 724 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 725 | type = sysfs_ns_type(parent_sd); |
| 726 | ns = sysfs_info(dir->i_sb)->ns[type]; |
| 727 | |
| 728 | sd = sysfs_find_dirent(parent_sd, ns, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 730 | /* no such entry */ |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 731 | if (!sd) { |
| 732 | ret = ERR_PTR(-ENOENT); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 733 | goto out_unlock; |
Tejun Heo | e49452c | 2008-01-16 12:06:14 +0900 | [diff] [blame] | 734 | } |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 735 | |
| 736 | /* attach dentry and inode */ |
Eric W. Biederman | fac2622 | 2010-02-12 19:22:27 -0800 | [diff] [blame] | 737 | inode = sysfs_get_inode(dir->i_sb, sd); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 738 | if (!inode) { |
| 739 | ret = ERR_PTR(-ENOMEM); |
| 740 | goto out_unlock; |
| 741 | } |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 742 | |
Tejun Heo | d6b4fd2 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 743 | /* instantiate and hash dentry */ |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 744 | ret = d_find_alias(inode); |
| 745 | if (!ret) { |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 746 | d_set_d_op(dentry, &sysfs_dentry_ops); |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 747 | dentry->d_fsdata = sysfs_get(sd); |
| 748 | d_add(dentry, inode); |
| 749 | } else { |
| 750 | d_move(ret, dentry); |
| 751 | iput(inode); |
| 752 | } |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 753 | |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 754 | out_unlock: |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 755 | mutex_unlock(&sysfs_mutex); |
Tejun Heo | 6cb5214 | 2007-07-31 19:15:08 +0900 | [diff] [blame] | 756 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | } |
| 758 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 759 | const struct inode_operations sysfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | .lookup = sysfs_lookup, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 761 | .permission = sysfs_permission, |
Maneesh Soni | 988d186 | 2005-05-31 10:39:14 +0530 | [diff] [blame] | 762 | .setattr = sysfs_setattr, |
Eric W. Biederman | e61ab4a | 2009-11-20 16:08:53 -0800 | [diff] [blame] | 763 | .getattr = sysfs_getattr, |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 764 | .setxattr = sysfs_setxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | }; |
| 766 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 767 | static void remove_dir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 769 | struct sysfs_addrm_cxt acxt; |
| 770 | |
| 771 | sysfs_addrm_start(&acxt, sd->s_parent); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 772 | sysfs_remove_one(&acxt, sd); |
| 773 | sysfs_addrm_finish(&acxt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
| 775 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 776 | void sysfs_remove_subdir(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 778 | remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 782 | static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 784 | struct sysfs_addrm_cxt acxt; |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 785 | struct rb_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 787 | if (!dir_sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | return; |
| 789 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 790 | pr_debug("sysfs %s: removing dir\n", dir_sd->s_name); |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 791 | sysfs_addrm_start(&acxt, dir_sd); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 792 | pos = rb_first(&dir_sd->s_dir.inode_tree); |
| 793 | while (pos) { |
| 794 | struct sysfs_dirent *sd = rb_entry(pos, struct sysfs_dirent, inode_node); |
| 795 | pos = rb_next(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 796 | if (sysfs_type(sd) != SYSFS_DIR) |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 797 | sysfs_remove_one(&acxt, sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 799 | sysfs_addrm_finish(&acxt); |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 800 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 801 | remove_dir(dir_sd); |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | /** |
| 805 | * sysfs_remove_dir - remove an object's directory. |
| 806 | * @kobj: object. |
| 807 | * |
| 808 | * The only thing special about this is that we remove any files in |
| 809 | * the directory before we remove the directory, and we've inlined |
| 810 | * what used to be sysfs_rmdir() below, instead of calling separately. |
| 811 | */ |
| 812 | |
| 813 | void sysfs_remove_dir(struct kobject * kobj) |
| 814 | { |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 815 | struct sysfs_dirent *sd = kobj->sd; |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 816 | |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 817 | spin_lock(&sysfs_assoc_lock); |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 818 | kobj->sd = NULL; |
Tejun Heo | 5f99532 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 819 | spin_unlock(&sysfs_assoc_lock); |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 820 | |
Tejun Heo | 608e266 | 2007-06-14 04:27:22 +0900 | [diff] [blame] | 821 | __sysfs_remove_dir(sd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 824 | int sysfs_rename(struct sysfs_dirent *sd, |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 825 | struct sysfs_dirent *new_parent_sd, const void *new_ns, |
| 826 | const char *new_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 828 | const char *dup_name = NULL; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 829 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 831 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 932ea2e | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 832 | |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 833 | error = 0; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 834 | 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] | 835 | (strcmp(sd->s_name, new_name) == 0)) |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 836 | goto out; /* nothing to rename */ |
| 837 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 838 | error = -EEXIST; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 839 | if (sysfs_find_dirent(new_parent_sd, new_ns, new_name)) |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 840 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 841 | |
Eric W. Biederman | 0b4a4fe | 2008-07-03 18:05:28 -0700 | [diff] [blame] | 842 | /* rename sysfs_dirent */ |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 843 | if (strcmp(sd->s_name, new_name) != 0) { |
| 844 | error = -ENOMEM; |
| 845 | new_name = dup_name = kstrdup(new_name, GFP_KERNEL); |
| 846 | if (!new_name) |
| 847 | goto out; |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 848 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 849 | dup_name = sd->s_name; |
| 850 | sd->s_name = new_name; |
| 851 | } |
| 852 | |
| 853 | /* Remove from old parent's list and insert into new parent's list. */ |
| 854 | if (sd->s_parent != new_parent_sd) { |
| 855 | sysfs_unlink_sibling(sd); |
| 856 | sysfs_get(new_parent_sd); |
| 857 | sysfs_put(sd->s_parent); |
| 858 | sd->s_parent = new_parent_sd; |
| 859 | sysfs_link_sibling(sd); |
| 860 | } |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 861 | sd->s_ns = new_ns; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 862 | |
Tejun Heo | 996b737 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 863 | error = 0; |
Eric W. Biederman | 9918f9a | 2007-08-20 21:36:31 +0900 | [diff] [blame] | 864 | out: |
Eric W. Biederman | 832b6af | 2009-11-20 16:08:56 -0800 | [diff] [blame] | 865 | mutex_unlock(&sysfs_mutex); |
| 866 | kfree(dup_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | return error; |
| 868 | } |
| 869 | |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 870 | int sysfs_rename_dir(struct kobject *kobj, const char *new_name) |
| 871 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 872 | struct sysfs_dirent *parent_sd = kobj->sd->s_parent; |
| 873 | const void *new_ns = NULL; |
| 874 | |
| 875 | if (sysfs_ns_type(parent_sd)) |
| 876 | new_ns = kobj->ktype->namespace(kobj); |
| 877 | |
| 878 | return sysfs_rename(kobj->sd, parent_sd, new_ns, new_name); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 879 | } |
| 880 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 881 | int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 882 | { |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 883 | struct sysfs_dirent *sd = kobj->sd; |
| 884 | struct sysfs_dirent *new_parent_sd; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 885 | const void *new_ns = NULL; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 886 | |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 887 | BUG_ON(!sd->s_parent); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 888 | if (sysfs_ns_type(sd->s_parent)) |
| 889 | new_ns = kobj->ktype->namespace(kobj); |
Eric W. Biederman | ca1bab3 | 2009-11-20 16:08:57 -0800 | [diff] [blame] | 890 | new_parent_sd = new_parent_kobj && new_parent_kobj->sd ? |
Cornelia Huck | a6a8357 | 2009-10-06 15:33:35 +0200 | [diff] [blame] | 891 | new_parent_kobj->sd : &sysfs_root; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 892 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 893 | return sysfs_rename(sd, new_parent_sd, new_ns, sd->s_name); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 894 | } |
| 895 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | /* Relationship between s_mode and the DT_xxx types */ |
| 897 | static inline unsigned char dt_type(struct sysfs_dirent *sd) |
| 898 | { |
| 899 | return (sd->s_mode >> 12) & 15; |
| 900 | } |
| 901 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 902 | static int sysfs_dir_release(struct inode *inode, struct file *filp) |
| 903 | { |
| 904 | sysfs_put(filp->private_data); |
| 905 | return 0; |
| 906 | } |
| 907 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 908 | static struct sysfs_dirent *sysfs_dir_pos(const void *ns, |
| 909 | 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] | 910 | { |
| 911 | if (pos) { |
| 912 | int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) && |
| 913 | pos->s_parent == parent_sd && |
| 914 | ino == pos->s_ino; |
| 915 | sysfs_put(pos); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 916 | if (!valid) |
| 917 | pos = NULL; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 918 | } |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 919 | if (!pos && (ino > 1) && (ino < INT_MAX)) { |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 920 | struct rb_node *p = parent_sd->s_dir.inode_tree.rb_node; |
| 921 | while (p) { |
| 922 | #define node rb_entry(p, struct sysfs_dirent, inode_node) |
| 923 | if (ino < node->s_ino) { |
| 924 | pos = node; |
| 925 | p = node->inode_node.rb_left; |
| 926 | } else if (ino > node->s_ino) { |
| 927 | p = node->inode_node.rb_right; |
| 928 | } else { |
| 929 | pos = node; |
| 930 | break; |
| 931 | } |
| 932 | #undef node |
| 933 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 934 | } |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 935 | while (pos && pos->s_ns && pos->s_ns != ns) { |
| 936 | struct rb_node *p = rb_next(&pos->inode_node); |
| 937 | if (!p) |
| 938 | pos = NULL; |
| 939 | else |
| 940 | pos = rb_entry(p, struct sysfs_dirent, inode_node); |
| 941 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 942 | return pos; |
| 943 | } |
| 944 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 945 | static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns, |
| 946 | 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] | 947 | { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 948 | pos = sysfs_dir_pos(ns, parent_sd, ino, pos); |
Mikulas Patocka | a406f75 | 2011-07-25 17:57:03 -0400 | [diff] [blame^] | 949 | if (pos) do { |
| 950 | struct rb_node *p = rb_next(&pos->inode_node); |
| 951 | if (!p) |
| 952 | pos = NULL; |
| 953 | else |
| 954 | pos = rb_entry(p, struct sysfs_dirent, inode_node); |
| 955 | } while (pos && pos->s_ns && pos->s_ns != ns); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 956 | return pos; |
| 957 | } |
| 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 960 | { |
Josef "Jeff" Sipek | f427f5d | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 961 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | struct sysfs_dirent * parent_sd = dentry->d_fsdata; |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 963 | struct sysfs_dirent *pos = filp->private_data; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 964 | enum kobj_ns_type type; |
| 965 | const void *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | ino_t ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 968 | type = sysfs_ns_type(parent_sd); |
| 969 | ns = sysfs_info(dentry->d_sb)->ns[type]; |
| 970 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 971 | if (filp->f_pos == 0) { |
| 972 | ino = parent_sd->s_ino; |
| 973 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0) |
| 974 | filp->f_pos++; |
| 975 | } |
| 976 | if (filp->f_pos == 1) { |
| 977 | if (parent_sd->s_parent) |
| 978 | ino = parent_sd->s_parent->s_ino; |
| 979 | else |
Eric Sandeen | dc35125 | 2007-06-11 14:02:45 +0900 | [diff] [blame] | 980 | ino = parent_sd->s_ino; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 981 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | filp->f_pos++; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 983 | } |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 984 | mutex_lock(&sysfs_mutex); |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 985 | 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] | 986 | pos; |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 987 | 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] | 988 | const char * name; |
| 989 | unsigned int type; |
| 990 | int len, ret; |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 991 | |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 992 | name = pos->s_name; |
| 993 | len = strlen(name); |
| 994 | ino = pos->s_ino; |
| 995 | type = dt_type(pos); |
| 996 | filp->f_pos = ino; |
| 997 | filp->private_data = sysfs_get(pos); |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 998 | |
Eric W. Biederman | 3efa65b | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 999 | mutex_unlock(&sysfs_mutex); |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1000 | ret = filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1001 | mutex_lock(&sysfs_mutex); |
| 1002 | if (ret < 0) |
| 1003 | break; |
| 1004 | } |
| 1005 | mutex_unlock(&sysfs_mutex); |
| 1006 | if ((filp->f_pos > 1) && !pos) { /* EOF */ |
| 1007 | filp->f_pos = INT_MAX; |
| 1008 | filp->private_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | } |
| 1010 | return 0; |
| 1011 | } |
| 1012 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1014 | const struct file_operations sysfs_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | .read = generic_read_dir, |
| 1016 | .readdir = sysfs_readdir, |
Eric W. Biederman | 1e5289c | 2010-01-01 14:43:53 -0800 | [diff] [blame] | 1017 | .release = sysfs_dir_release, |
Christoph Hellwig | 3222a3e | 2008-09-03 21:53:01 +0200 | [diff] [blame] | 1018 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | }; |