blob: ae006b070bf0c924fd15981ab3d2d9cea825564f [file] [log] [blame]
Tejun Heo3e519032007-06-14 03:45:15 +09001struct sysfs_elem_dir {
2 struct kobject * kobj;
3};
4
5struct sysfs_elem_symlink {
Tejun Heo2b29ac22007-06-14 03:45:15 +09006 struct sysfs_dirent * target_sd;
Tejun Heo3e519032007-06-14 03:45:15 +09007};
8
9struct sysfs_elem_attr {
10 struct attribute * attr;
11};
12
13struct sysfs_elem_bin_attr {
14 struct bin_attribute * bin_attr;
15};
16
Tejun Heo0ab66082007-06-14 03:45:16 +090017/*
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. Richterd56c3ea2007-02-16 21:35:25 +080022struct sysfs_dirent {
23 atomic_t s_count;
Tejun Heo8619f972007-06-14 03:45:18 +090024 atomic_t s_active;
Tejun Heo13b30862007-06-14 03:45:14 +090025 struct sysfs_dirent * s_parent;
Adam J. Richterd56c3ea2007-02-16 21:35:25 +080026 struct list_head s_sibling;
27 struct list_head s_children;
Tejun Heo0c096b52007-06-14 03:45:15 +090028 const char * s_name;
Tejun Heo3e519032007-06-14 03:45:15 +090029
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. Richterd56c3ea2007-02-16 21:35:25 +080037 int s_type;
38 umode_t s_mode;
Eric Sandeendc351252007-06-11 14:02:45 +090039 ino_t s_ino;
Adam J. Richterd56c3ea2007-02-16 21:35:25 +080040 struct dentry * s_dentry;
41 struct iattr * s_iattr;
42 atomic_t s_event;
43};
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Tejun Heo8619f972007-06-14 03:45:18 +090045#define SD_DEACTIVATED_BIAS INT_MIN
Tejun Heo0ab66082007-06-14 03:45:16 +090046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047extern struct vfsmount * sysfs_mount;
Christoph Lametere18b8902006-12-06 20:33:20 -080048extern struct kmem_cache *sysfs_dir_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Tejun Heob6b4a432007-06-14 03:45:18 +090050extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
51extern void sysfs_put_active(struct sysfs_dirent *sd);
52extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
53extern void sysfs_put_active_two(struct sysfs_dirent *sd);
54extern void sysfs_deactivate(struct sysfs_dirent *sd);
55
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -070056extern void sysfs_delete_inode(struct inode *inode);
Tejun Heofc9f54b2007-06-14 03:45:17 +090057extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode);
Tejun Heo8312a8d2007-06-14 03:45:17 +090058extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
Tejun Heofc9f54b2007-06-14 03:45:17 +090059extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Tejun Heofa7f9122007-06-14 03:45:13 +090061extern void release_sysfs_dirent(struct sysfs_dirent * sd);
Maneesh Sonic5168652006-03-09 19:40:14 +053062extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
Tejun Heo3e519032007-06-14 03:45:15 +090063extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
64 int type);
Tejun Heoa26cd722007-06-14 03:45:14 +090065extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
66 struct sysfs_dirent *parent_sd,
67 struct dentry *dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
Randy.Dunlap995982c2006-07-10 23:05:25 -070070extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
NeilBrown4508a7a2006-03-20 17:53:53 +110071extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
74extern void sysfs_remove_subdir(struct dentry *);
75
Tejun Heodbde0fc2007-06-14 03:45:16 +090076extern void sysfs_drop_dentry(struct sysfs_dirent *sd);
Maneesh Soni988d1862005-05-31 10:39:14 +053077extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Tejun Heodd14cbc2007-06-11 14:04:01 +090079extern spinlock_t sysfs_lock;
Tejun Heoaecdced2007-06-14 03:45:15 +090080extern spinlock_t kobj_sysfs_assoc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081extern struct rw_semaphore sysfs_rename_sem;
82extern struct super_block * sysfs_sb;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080083extern const struct file_operations sysfs_dir_operations;
84extern const struct file_operations sysfs_file_operations;
85extern const struct file_operations bin_fops;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -080086extern const struct inode_operations sysfs_dir_inode_operations;
87extern const struct inode_operations sysfs_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Linus Torvalds1da177e2005-04-16 15:20:36 -070089static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
90{
91 if (sd) {
92 WARN_ON(!atomic_read(&sd->s_count));
93 atomic_inc(&sd->s_count);
94 }
95 return sd;
96}
97
98static inline void sysfs_put(struct sysfs_dirent * sd)
99{
Tejun Heo7a23ad42007-06-14 03:45:13 +0900100 if (sd && atomic_dec_and_test(&sd->s_count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 release_sysfs_dirent(sd);
102}
103
Eric W. Biedermanb592fcf2007-01-24 12:35:52 -0700104static inline int sysfs_is_shadowed_inode(struct inode *inode)
105{
106 return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
107}