Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 1 | /* type-specific structures for sysfs_dirent->s_* union members */ |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 2 | struct sysfs_elem_dir { |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 3 | struct kobject *kobj; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 4 | }; |
| 5 | |
| 6 | struct sysfs_elem_symlink { |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 7 | struct sysfs_dirent *target_sd; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 8 | }; |
| 9 | |
| 10 | struct sysfs_elem_attr { |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 11 | struct attribute *attr; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 12 | }; |
| 13 | |
| 14 | struct sysfs_elem_bin_attr { |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 15 | struct bin_attribute *bin_attr; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 16 | }; |
| 17 | |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 18 | /* |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 19 | * sysfs_dirent - the building block of sysfs hierarchy. Each and |
| 20 | * every sysfs node is represented by single sysfs_dirent. |
| 21 | * |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 22 | * As long as s_count reference is held, the sysfs_dirent itself is |
| 23 | * accessible. Dereferencing s_elem or any other outer entity |
| 24 | * requires s_active reference. |
| 25 | */ |
Adam J. Richter | d56c3ea | 2007-02-16 21:35:25 +0800 | [diff] [blame] | 26 | struct sysfs_dirent { |
| 27 | atomic_t s_count; |
Tejun Heo | 8619f97 | 2007-06-14 03:45:18 +0900 | [diff] [blame] | 28 | atomic_t s_active; |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 29 | struct sysfs_dirent *s_parent; |
| 30 | struct sysfs_dirent *s_sibling; |
| 31 | struct sysfs_dirent *s_children; |
| 32 | const char *s_name; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 33 | |
| 34 | union { |
Tejun Heo | b1fc3d6 | 2007-09-20 16:05:11 +0900 | [diff] [blame] | 35 | struct sysfs_elem_dir s_dir; |
| 36 | struct sysfs_elem_symlink s_symlink; |
| 37 | struct sysfs_elem_attr s_attr; |
| 38 | struct sysfs_elem_bin_attr s_bin_attr; |
| 39 | }; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 40 | |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 41 | unsigned int s_flags; |
Eric Sandeen | dc35125 | 2007-06-11 14:02:45 +0900 | [diff] [blame] | 42 | ino_t s_ino; |
Tejun Heo | b13dc89 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 43 | umode_t s_mode; |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 44 | struct iattr *s_iattr; |
Adam J. Richter | d56c3ea | 2007-02-16 21:35:25 +0800 | [diff] [blame] | 45 | atomic_t s_event; |
| 46 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 48 | #define SD_DEACTIVATED_BIAS INT_MIN |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 49 | |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 50 | #define SYSFS_TYPE_MASK 0x00ff |
Tejun Heo | dc2f75f | 2007-09-20 16:05:12 +0900 | [diff] [blame^] | 51 | #define SYSFS_DIR 0x0001 |
| 52 | #define SYSFS_KOBJ_ATTR 0x0002 |
| 53 | #define SYSFS_KOBJ_BIN_ATTR 0x0004 |
| 54 | #define SYSFS_KOBJ_LINK 0x0008 |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 55 | #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) |
| 56 | |
| 57 | #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK |
| 58 | #define SYSFS_FLAG_REMOVED 0x0200 |
| 59 | |
| 60 | static inline unsigned int sysfs_type(struct sysfs_dirent *sd) |
| 61 | { |
| 62 | return sd->s_flags & SYSFS_TYPE_MASK; |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Context structure to be used while adding/removing nodes. |
| 67 | */ |
Tejun Heo | fb6896d | 2007-06-14 04:27:24 +0900 | [diff] [blame] | 68 | struct sysfs_addrm_cxt { |
| 69 | struct sysfs_dirent *parent_sd; |
| 70 | struct inode *parent_inode; |
| 71 | struct sysfs_dirent *removed; |
| 72 | int cnt; |
| 73 | }; |
| 74 | |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 75 | /* |
| 76 | * mount.c |
| 77 | */ |
Tejun Heo | 5122503 | 2007-06-14 04:27:25 +0900 | [diff] [blame] | 78 | extern struct sysfs_dirent sysfs_root; |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 79 | extern struct super_block *sysfs_sb; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 80 | extern struct kmem_cache *sysfs_dir_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 82 | /* |
| 83 | * dir.c |
| 84 | */ |
Tejun Heo | 3007e99 | 2007-06-14 04:27:23 +0900 | [diff] [blame] | 85 | extern struct mutex sysfs_mutex; |
Eric W. Biederman | 932ea2e | 2007-08-20 21:36:30 +0900 | [diff] [blame] | 86 | extern struct mutex sysfs_rename_mutex; |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 87 | extern spinlock_t sysfs_assoc_lock; |
| 88 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 89 | extern const struct file_operations sysfs_dir_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 90 | extern const struct inode_operations sysfs_dir_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 92 | struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); |
| 93 | struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); |
| 94 | void sysfs_put_active(struct sysfs_dirent *sd); |
| 95 | struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); |
| 96 | void sysfs_put_active_two(struct sysfs_dirent *sd); |
| 97 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
| 98 | struct sysfs_dirent *parent_sd); |
| 99 | int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
| 100 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
| 101 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); |
Tejun Heo | b402d72 | 2007-06-14 04:27:21 +0900 | [diff] [blame] | 102 | |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 103 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
| 104 | const unsigned char *name); |
| 105 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
| 106 | const unsigned char *name); |
| 107 | struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); |
| 108 | |
| 109 | void release_sysfs_dirent(struct sysfs_dirent *sd); |
| 110 | |
| 111 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| 112 | struct sysfs_dirent **p_sd); |
| 113 | void sysfs_remove_subdir(struct sysfs_dirent *sd); |
| 114 | |
| 115 | static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
| 117 | if (sd) { |
| 118 | WARN_ON(!atomic_read(&sd->s_count)); |
| 119 | atomic_inc(&sd->s_count); |
| 120 | } |
| 121 | return sd; |
| 122 | } |
| 123 | |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 124 | static inline void sysfs_put(struct sysfs_dirent *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | { |
Tejun Heo | 7a23ad4 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 126 | if (sd && atomic_dec_and_test(&sd->s_count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | release_sysfs_dirent(sd); |
| 128 | } |
Tejun Heo | 59f6901 | 2007-09-20 16:05:10 +0900 | [diff] [blame] | 129 | |
| 130 | /* |
| 131 | * inode.c |
| 132 | */ |
| 133 | struct inode *sysfs_get_inode(struct sysfs_dirent *sd); |
| 134 | int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); |
| 135 | int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); |
| 136 | |
| 137 | /* |
| 138 | * file.c |
| 139 | */ |
| 140 | extern const struct file_operations sysfs_file_operations; |
| 141 | |
| 142 | int sysfs_add_file(struct sysfs_dirent *dir_sd, |
| 143 | const struct attribute *attr, int type); |
| 144 | |
| 145 | /* |
| 146 | * bin.c |
| 147 | */ |
| 148 | extern const struct file_operations bin_fops; |
| 149 | |
| 150 | /* |
| 151 | * symlink.c |
| 152 | */ |
| 153 | extern const struct inode_operations sysfs_symlink_inode_operations; |