Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 1 | struct sysfs_elem_dir { |
| 2 | struct kobject * kobj; |
| 3 | }; |
| 4 | |
| 5 | struct sysfs_elem_symlink { |
Tejun Heo | 2b29ac2 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 6 | struct sysfs_dirent * target_sd; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 7 | }; |
| 8 | |
| 9 | struct sysfs_elem_attr { |
| 10 | struct attribute * attr; |
| 11 | }; |
| 12 | |
| 13 | struct sysfs_elem_bin_attr { |
| 14 | struct bin_attribute * bin_attr; |
| 15 | }; |
| 16 | |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 17 | /* |
| 18 | * As long as s_count reference is held, the sysfs_dirent itself is |
| 19 | * accessible. Dereferencing s_elem or any other outer entity |
| 20 | * requires s_active reference. |
| 21 | */ |
Adam J. Richter | d56c3ea | 2007-02-16 21:35:25 +0800 | [diff] [blame] | 22 | struct sysfs_dirent { |
| 23 | atomic_t s_count; |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 24 | struct rw_semaphore s_active; |
Tejun Heo | 13b3086 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 25 | struct sysfs_dirent * s_parent; |
Adam J. Richter | d56c3ea | 2007-02-16 21:35:25 +0800 | [diff] [blame] | 26 | struct list_head s_sibling; |
| 27 | struct list_head s_children; |
Tejun Heo | 0c096b5 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 28 | const char * s_name; |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 29 | |
| 30 | union { |
| 31 | struct sysfs_elem_dir dir; |
| 32 | struct sysfs_elem_symlink symlink; |
| 33 | struct sysfs_elem_attr attr; |
| 34 | struct sysfs_elem_bin_attr bin_attr; |
| 35 | } s_elem; |
| 36 | |
Adam J. Richter | d56c3ea | 2007-02-16 21:35:25 +0800 | [diff] [blame] | 37 | int s_type; |
| 38 | umode_t s_mode; |
Eric Sandeen | dc35125 | 2007-06-11 14:02:45 +0900 | [diff] [blame] | 39 | ino_t s_ino; |
Adam J. Richter | d56c3ea | 2007-02-16 21:35:25 +0800 | [diff] [blame] | 40 | struct dentry * s_dentry; |
| 41 | struct iattr * s_iattr; |
| 42 | atomic_t s_event; |
| 43 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Tejun Heo | 0ab6608 | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 45 | /* |
| 46 | * A sysfs file which deletes another file when written to need to |
| 47 | * write lock the s_active of the victim while its s_active is read |
| 48 | * locked for the write operation. Tell lockdep that this is okay. |
| 49 | */ |
| 50 | enum sysfs_s_active_class |
| 51 | { |
| 52 | SYSFS_S_ACTIVE_NORMAL, /* file r/w access, etc - default */ |
| 53 | SYSFS_S_ACTIVE_DEACTIVATE, /* file deactivation */ |
| 54 | }; |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | extern struct vfsmount * sysfs_mount; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 57 | extern struct kmem_cache *sysfs_dir_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Tejun Heo | b6b4a43 | 2007-06-14 03:45:18 +0900 | [diff] [blame^] | 59 | extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); |
| 60 | extern void sysfs_put_active(struct sysfs_dirent *sd); |
| 61 | extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); |
| 62 | extern void sysfs_put_active_two(struct sysfs_dirent *sd); |
| 63 | extern void sysfs_deactivate(struct sysfs_dirent *sd); |
| 64 | |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 65 | extern void sysfs_delete_inode(struct inode *inode); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 66 | extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode); |
Tejun Heo | 8312a8d | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 67 | extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd); |
Tejun Heo | fc9f54b | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 68 | extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Tejun Heo | fa7f912 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 70 | extern void release_sysfs_dirent(struct sysfs_dirent * sd); |
Maneesh Soni | c516865 | 2006-03-09 19:40:14 +0530 | [diff] [blame] | 71 | extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *); |
Tejun Heo | 3e51903 | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 72 | extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, |
| 73 | int type); |
Tejun Heo | a26cd72 | 2007-06-14 03:45:14 +0900 | [diff] [blame] | 74 | extern void sysfs_attach_dirent(struct sysfs_dirent *sd, |
| 75 | struct sysfs_dirent *parent_sd, |
| 76 | struct dentry *dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | extern int sysfs_add_file(struct dentry *, const struct attribute *, int); |
Randy.Dunlap | 995982c | 2006-07-10 23:05:25 -0700 | [diff] [blame] | 79 | extern int sysfs_hash_and_remove(struct dentry * dir, const char * name); |
NeilBrown | 4508a7a | 2006-03-20 17:53:53 +1100 | [diff] [blame] | 80 | extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **); |
| 83 | extern void sysfs_remove_subdir(struct dentry *); |
| 84 | |
Tejun Heo | dbde0fc | 2007-06-14 03:45:16 +0900 | [diff] [blame] | 85 | extern void sysfs_drop_dentry(struct sysfs_dirent *sd); |
Maneesh Soni | 988d186 | 2005-05-31 10:39:14 +0530 | [diff] [blame] | 86 | extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Tejun Heo | dd14cbc | 2007-06-11 14:04:01 +0900 | [diff] [blame] | 88 | extern spinlock_t sysfs_lock; |
Tejun Heo | aecdced | 2007-06-14 03:45:15 +0900 | [diff] [blame] | 89 | extern spinlock_t kobj_sysfs_assoc_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | extern struct rw_semaphore sysfs_rename_sem; |
| 91 | extern struct super_block * sysfs_sb; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 92 | extern const struct file_operations sysfs_dir_operations; |
| 93 | extern const struct file_operations sysfs_file_operations; |
| 94 | extern const struct file_operations bin_fops; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 95 | extern const struct inode_operations sysfs_dir_inode_operations; |
| 96 | extern const struct inode_operations sysfs_symlink_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) |
| 99 | { |
| 100 | if (sd) { |
| 101 | WARN_ON(!atomic_read(&sd->s_count)); |
| 102 | atomic_inc(&sd->s_count); |
| 103 | } |
| 104 | return sd; |
| 105 | } |
| 106 | |
| 107 | static inline void sysfs_put(struct sysfs_dirent * sd) |
| 108 | { |
Tejun Heo | 7a23ad4 | 2007-06-14 03:45:13 +0900 | [diff] [blame] | 109 | if (sd && atomic_dec_and_test(&sd->s_count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | release_sysfs_dirent(sd); |
| 111 | } |
| 112 | |
Eric W. Biederman | b592fcf | 2007-01-24 12:35:52 -0700 | [diff] [blame] | 113 | static inline int sysfs_is_shadowed_inode(struct inode *inode) |
| 114 | { |
| 115 | return S_ISDIR(inode->i_mode) && inode->i_op->follow_link; |
| 116 | } |