X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fsysfs%2Fsysfs.h;h=7593d71d92f8a29f2637647ab474f4473cf5463f;hb=fac2622bbad4d7e3a32c53e631e018b80ec631dc;hp=1966e1a0a0159616a7b88c0c2a4cb4b99acf26cc;hpb=dc351252b33f8fede396d6173dba117bcb933607;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index 1966e1a..7593d71 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -1,116 +1,158 @@ -struct sysfs_dirent { - atomic_t s_count; - struct list_head s_sibling; - struct list_head s_children; - void * s_element; - int s_type; - umode_t s_mode; - ino_t s_ino; - struct dentry * s_dentry; - struct iattr * s_iattr; - atomic_t s_event; +/* + * fs/sysfs/sysfs.h - sysfs internal header file + * + * Copyright (c) 2001-3 Patrick Mochel + * Copyright (c) 2007 SUSE Linux Products GmbH + * Copyright (c) 2007 Tejun Heo + * + * This file is released under the GPLv2. + */ + +#include +#include + +struct sysfs_open_dirent; + +/* type-specific structures for sysfs_dirent->s_* union members */ +struct sysfs_elem_dir { + struct kobject *kobj; + /* children list starts here and goes through sd->s_sibling */ + struct sysfs_dirent *children; }; -extern struct vfsmount * sysfs_mount; -extern struct kmem_cache *sysfs_dir_cachep; +struct sysfs_elem_symlink { + struct sysfs_dirent *target_sd; +}; -extern void sysfs_delete_inode(struct inode *inode); -extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *); -extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); +struct sysfs_elem_attr { + struct attribute *attr; + struct sysfs_open_dirent *open; +}; -extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *); -extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *, - umode_t, int); +struct sysfs_elem_bin_attr { + struct bin_attribute *bin_attr; + struct hlist_head buffers; +}; -extern int sysfs_add_file(struct dentry *, const struct attribute *, int); -extern int sysfs_hash_and_remove(struct dentry * dir, const char * name); -extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); +struct sysfs_inode_attrs { + struct iattr ia_iattr; + void *ia_secdata; + u32 ia_secdata_len; +}; -extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **); -extern void sysfs_remove_subdir(struct dentry *); +/* + * sysfs_dirent - the building block of sysfs hierarchy. Each and + * every sysfs node is represented by single sysfs_dirent. + * + * As long as s_count reference is held, the sysfs_dirent itself is + * accessible. Dereferencing s_elem or any other outer entity + * requires s_active reference. + */ +struct sysfs_dirent { + atomic_t s_count; + atomic_t s_active; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif + struct sysfs_dirent *s_parent; + struct sysfs_dirent *s_sibling; + const char *s_name; + + union { + struct sysfs_elem_dir s_dir; + struct sysfs_elem_symlink s_symlink; + struct sysfs_elem_attr s_attr; + struct sysfs_elem_bin_attr s_bin_attr; + }; + + unsigned int s_flags; + unsigned short s_mode; + ino_t s_ino; + struct sysfs_inode_attrs *s_iattr; +}; -extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd); -extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent); -extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); +#define SD_DEACTIVATED_BIAS INT_MIN -extern struct rw_semaphore sysfs_rename_sem; -extern struct super_block * sysfs_sb; -extern const struct file_operations sysfs_dir_operations; -extern const struct file_operations sysfs_file_operations; -extern const struct file_operations bin_fops; -extern const struct inode_operations sysfs_dir_inode_operations; -extern const struct inode_operations sysfs_symlink_inode_operations; +#define SYSFS_TYPE_MASK 0x00ff +#define SYSFS_DIR 0x0001 +#define SYSFS_KOBJ_ATTR 0x0002 +#define SYSFS_KOBJ_BIN_ATTR 0x0004 +#define SYSFS_KOBJ_LINK 0x0008 +#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) +#define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR) -struct sysfs_symlink { - char * link_name; - struct kobject * target_kobj; -}; +#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK +#define SYSFS_FLAG_REMOVED 0x0200 -struct sysfs_buffer { - struct list_head associates; - size_t count; - loff_t pos; - char * page; - struct sysfs_ops * ops; - struct semaphore sem; - int orphaned; - int needs_read_fill; - int event; -}; +static inline unsigned int sysfs_type(struct sysfs_dirent *sd) +{ + return sd->s_flags & SYSFS_TYPE_MASK; +} -struct sysfs_buffer_collection { - struct list_head associates; +#ifdef CONFIG_DEBUG_LOCK_ALLOC +#define sysfs_dirent_init_lockdep(sd) \ +do { \ + struct attribute *attr = sd->s_attr.attr; \ + struct lock_class_key *key = attr->key; \ + if (!key) \ + key = &attr->skey; \ + \ + lockdep_init_map(&sd->dep_map, "s_active", key, 0); \ +} while(0) +#else +#define sysfs_dirent_init_lockdep(sd) do {} while(0) +#endif + +/* + * Context structure to be used while adding/removing nodes. + */ +struct sysfs_addrm_cxt { + struct sysfs_dirent *parent_sd; + struct sysfs_dirent *removed; }; -static inline struct kobject * to_kobj(struct dentry * dentry) -{ - struct sysfs_dirent * sd = dentry->d_fsdata; - return ((struct kobject *) sd->s_element); -} +/* + * mount.c + */ +extern struct sysfs_dirent sysfs_root; +extern struct super_block *sysfs_sb; +extern struct kmem_cache *sysfs_dir_cachep; -static inline struct attribute * to_attr(struct dentry * dentry) -{ - struct sysfs_dirent * sd = dentry->d_fsdata; - return ((struct attribute *) sd->s_element); -} +/* + * dir.c + */ +extern struct mutex sysfs_mutex; +extern spinlock_t sysfs_assoc_lock; -static inline struct bin_attribute * to_bin_attr(struct dentry * dentry) -{ - struct sysfs_dirent * sd = dentry->d_fsdata; - return ((struct bin_attribute *) sd->s_element); -} +extern const struct file_operations sysfs_dir_operations; +extern const struct inode_operations sysfs_dir_inode_operations; -static inline struct kobject *sysfs_get_kobject(struct dentry *dentry) -{ - struct kobject * kobj = NULL; - - spin_lock(&dcache_lock); - if (!d_unhashed(dentry)) { - struct sysfs_dirent * sd = dentry->d_fsdata; - if (sd->s_type & SYSFS_KOBJ_LINK) { - struct sysfs_symlink * sl = sd->s_element; - kobj = kobject_get(sl->target_kobj); - } else - kobj = kobject_get(sd->s_element); - } - spin_unlock(&dcache_lock); +struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); +struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); +void sysfs_put_active(struct sysfs_dirent *sd); +void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, + struct sysfs_dirent *parent_sd); +int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); +int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); +void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); +void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); - return kobj; -} +struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, + const unsigned char *name); +struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, + const unsigned char *name); +struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); -static inline void release_sysfs_dirent(struct sysfs_dirent * sd) -{ - if (sd->s_type & SYSFS_KOBJ_LINK) { - struct sysfs_symlink * sl = sd->s_element; - kfree(sl->link_name); - kobject_put(sl->target_kobj); - kfree(sl); - } - kfree(sd->s_iattr); - kmem_cache_free(sysfs_dir_cachep, sd); -} +void release_sysfs_dirent(struct sysfs_dirent *sd); + +int sysfs_create_subdir(struct kobject *kobj, const char *name, + struct sysfs_dirent **p_sd); +void sysfs_remove_subdir(struct sysfs_dirent *sd); -static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) +int sysfs_rename(struct sysfs_dirent *sd, + struct sysfs_dirent *new_parent_sd, const char *new_name); + +static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd) { if (sd) { WARN_ON(!atomic_read(&sd->s_count)); @@ -118,14 +160,46 @@ static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) } return sd; } +#define sysfs_get(sd) __sysfs_get(sd) -static inline void sysfs_put(struct sysfs_dirent * sd) +static inline void __sysfs_put(struct sysfs_dirent *sd) { - if (atomic_dec_and_test(&sd->s_count)) + if (sd && atomic_dec_and_test(&sd->s_count)) release_sysfs_dirent(sd); } +#define sysfs_put(sd) __sysfs_put(sd) + +/* + * inode.c + */ +struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd); +void sysfs_delete_inode(struct inode *inode); +int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr); +int sysfs_permission(struct inode *inode, int mask); +int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); +int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); +int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value, + size_t size, int flags); +int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); +int sysfs_inode_init(void); + +/* + * file.c + */ +extern const struct file_operations sysfs_file_operations; -static inline int sysfs_is_shadowed_inode(struct inode *inode) -{ - return S_ISDIR(inode->i_mode) && inode->i_op->follow_link; -} +int sysfs_add_file(struct sysfs_dirent *dir_sd, + const struct attribute *attr, int type); + +int sysfs_add_file_mode(struct sysfs_dirent *dir_sd, + const struct attribute *attr, int type, mode_t amode); +/* + * bin.c + */ +extern const struct file_operations bin_fops; +void unmap_bin_file(struct sysfs_dirent *attr_sd); + +/* + * symlink.c + */ +extern const struct inode_operations sysfs_symlink_inode_operations;