2007-06-13 12:45:15 -06:00
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struct sysfs_elem_dir {
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struct kobject * kobj;
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};
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struct sysfs_elem_symlink {
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2007-06-13 12:45:15 -06:00
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struct sysfs_dirent * target_sd;
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2007-06-13 12:45:15 -06:00
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};
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struct sysfs_elem_attr {
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struct attribute * attr;
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};
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struct sysfs_elem_bin_attr {
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struct bin_attribute * bin_attr;
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};
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2007-06-13 12:45:16 -06:00
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/*
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* As long as s_count reference is held, the sysfs_dirent itself is
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* accessible. Dereferencing s_elem or any other outer entity
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* requires s_active reference.
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*/
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2007-02-16 06:35:25 -07:00
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struct sysfs_dirent {
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atomic_t s_count;
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2007-06-13 12:45:16 -06:00
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struct rw_semaphore s_active;
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2007-06-13 12:45:14 -06:00
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struct sysfs_dirent * s_parent;
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2007-02-16 06:35:25 -07:00
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struct list_head s_sibling;
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struct list_head s_children;
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2007-06-13 12:45:15 -06:00
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const char * s_name;
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2007-06-13 12:45:15 -06:00
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union {
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struct sysfs_elem_dir dir;
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struct sysfs_elem_symlink symlink;
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struct sysfs_elem_attr attr;
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struct sysfs_elem_bin_attr bin_attr;
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} s_elem;
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2007-02-16 06:35:25 -07:00
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int s_type;
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umode_t s_mode;
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2007-06-10 23:02:45 -06:00
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ino_t s_ino;
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2007-02-16 06:35:25 -07:00
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struct dentry * s_dentry;
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struct iattr * s_iattr;
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atomic_t s_event;
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};
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2005-04-16 16:20:36 -06:00
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2007-06-13 12:45:16 -06:00
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/*
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* A sysfs file which deletes another file when written to need to
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* write lock the s_active of the victim while its s_active is read
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* locked for the write operation. Tell lockdep that this is okay.
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*/
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enum sysfs_s_active_class
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{
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SYSFS_S_ACTIVE_NORMAL, /* file r/w access, etc - default */
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SYSFS_S_ACTIVE_DEACTIVATE, /* file deactivation */
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};
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2005-04-16 16:20:36 -06:00
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extern struct vfsmount * sysfs_mount;
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2006-12-06 21:33:20 -07:00
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extern struct kmem_cache *sysfs_dir_cachep;
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2005-04-16 16:20:36 -06:00
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|
2007-01-24 12:35:52 -07:00
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extern void sysfs_delete_inode(struct inode *inode);
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2007-06-13 12:45:17 -06:00
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extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode);
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extern struct inode * sysfs_new_inode(struct sysfs_dirent *sd);
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extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
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2005-04-16 16:20:36 -06:00
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|
2007-06-13 12:45:13 -06:00
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extern void release_sysfs_dirent(struct sysfs_dirent * sd);
|
2006-03-09 07:10:14 -07:00
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extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
|
2007-06-13 12:45:15 -06:00
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extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
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|
|
int type);
|
2007-06-13 12:45:14 -06:00
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|
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extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
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struct sysfs_dirent *parent_sd,
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|
|
struct dentry *dentry);
|
2005-04-16 16:20:36 -06:00
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extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
|
2006-07-11 00:05:25 -06:00
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extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
|
2006-03-19 23:53:53 -07:00
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extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
|
2005-04-16 16:20:36 -06:00
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|
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|
|
extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
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|
extern void sysfs_remove_subdir(struct dentry *);
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|
|
|
|
2007-06-13 12:45:16 -06:00
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|
|
extern void sysfs_drop_dentry(struct sysfs_dirent *sd);
|
2005-05-30 23:09:14 -06:00
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|
extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
|
2005-04-16 16:20:36 -06:00
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|
|
2007-06-10 23:04:01 -06:00
|
|
|
extern spinlock_t sysfs_lock;
|
2007-06-13 12:45:15 -06:00
|
|
|
extern spinlock_t kobj_sysfs_assoc_lock;
|
2005-04-16 16:20:36 -06:00
|
|
|
extern struct rw_semaphore sysfs_rename_sem;
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|
|
|
extern struct super_block * sysfs_sb;
|
2006-03-28 02:56:42 -07:00
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|
|
extern const struct file_operations sysfs_dir_operations;
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|
|
|
extern const struct file_operations sysfs_file_operations;
|
|
|
|
extern const struct file_operations bin_fops;
|
2007-02-12 01:55:40 -07:00
|
|
|
extern const struct inode_operations sysfs_dir_inode_operations;
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|
|
|
extern const struct inode_operations sysfs_symlink_inode_operations;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-06-13 12:45:16 -06:00
|
|
|
static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2007-06-13 12:45:16 -06:00
|
|
|
if (sd) {
|
|
|
|
WARN_ON(!atomic_read(&sd->s_count));
|
|
|
|
atomic_inc(&sd->s_count);
|
|
|
|
}
|
|
|
|
return sd;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2007-06-13 12:45:16 -06:00
|
|
|
static inline void sysfs_put(struct sysfs_dirent * sd)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2007-06-13 12:45:16 -06:00
|
|
|
if (sd && atomic_dec_and_test(&sd->s_count))
|
|
|
|
release_sysfs_dirent(sd);
|
|
|
|
}
|
2007-06-13 12:45:15 -06:00
|
|
|
|
2007-06-13 12:45:16 -06:00
|
|
|
/**
|
|
|
|
* sysfs_get_active - get an active reference to sysfs_dirent
|
|
|
|
* @sd: sysfs_dirent to get an active reference to
|
|
|
|
*
|
|
|
|
* Get an active reference of @sd. This function is noop if @sd
|
|
|
|
* is NULL.
|
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* Pointer to @sd on success, NULL on failure.
|
|
|
|
*/
|
|
|
|
static inline struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
if (sd) {
|
|
|
|
if (unlikely(!down_read_trylock(&sd->s_active)))
|
|
|
|
sd = NULL;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2007-06-13 12:45:16 -06:00
|
|
|
return sd;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-06-13 12:45:16 -06:00
|
|
|
/**
|
|
|
|
* sysfs_put_active - put an active reference to sysfs_dirent
|
|
|
|
* @sd: sysfs_dirent to put an active reference to
|
|
|
|
*
|
|
|
|
* Put an active reference to @sd. This function is noop if @sd
|
|
|
|
* is NULL.
|
|
|
|
*/
|
|
|
|
static inline void sysfs_put_active(struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
if (sd)
|
|
|
|
up_read(&sd->s_active);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2007-06-13 12:45:16 -06:00
|
|
|
/**
|
|
|
|
* sysfs_get_active_two - get active references to sysfs_dirent and parent
|
|
|
|
* @sd: sysfs_dirent of interest
|
|
|
|
*
|
|
|
|
* Get active reference to @sd and its parent. Parent's active
|
|
|
|
* reference is grabbed first. This function is noop if @sd is
|
|
|
|
* NULL.
|
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* Pointer to @sd on success, NULL on failure.
|
|
|
|
*/
|
|
|
|
static inline struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
if (sd) {
|
2007-06-13 12:45:16 -06:00
|
|
|
if (sd->s_parent && unlikely(!sysfs_get_active(sd->s_parent)))
|
|
|
|
return NULL;
|
|
|
|
if (unlikely(!sysfs_get_active(sd))) {
|
|
|
|
sysfs_put_active(sd->s_parent);
|
|
|
|
return NULL;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
return sd;
|
|
|
|
}
|
|
|
|
|
2007-06-13 12:45:16 -06:00
|
|
|
/**
|
|
|
|
* sysfs_put_active_two - put active references to sysfs_dirent and parent
|
|
|
|
* @sd: sysfs_dirent of interest
|
|
|
|
*
|
|
|
|
* Put active references to @sd and its parent. This function is
|
|
|
|
* noop if @sd is NULL.
|
|
|
|
*/
|
|
|
|
static inline void sysfs_put_active_two(struct sysfs_dirent *sd)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2007-06-13 12:45:16 -06:00
|
|
|
if (sd) {
|
|
|
|
sysfs_put_active(sd);
|
|
|
|
sysfs_put_active(sd->s_parent);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_deactivate - deactivate sysfs_dirent
|
|
|
|
* @sd: sysfs_dirent to deactivate
|
|
|
|
*
|
|
|
|
* Deny new active references and drain existing ones. s_active
|
|
|
|
* will be unlocked when the sysfs_dirent is released.
|
|
|
|
*/
|
|
|
|
static inline void sysfs_deactivate(struct sysfs_dirent *sd)
|
|
|
|
{
|
|
|
|
down_write_nested(&sd->s_active, SYSFS_S_ACTIVE_DEACTIVATE);
|
|
|
|
|
|
|
|
/* s_active will be unlocked by the thread doing the final put
|
|
|
|
* on @sd. Lie to lockdep.
|
|
|
|
*/
|
|
|
|
rwsem_release(&sd->s_active.dep_map, 1, _RET_IP_);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2007-01-24 12:35:52 -07:00
|
|
|
static inline int sysfs_is_shadowed_inode(struct inode *inode)
|
|
|
|
{
|
|
|
|
return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
|
|
|
|
}
|