+/*
+ * 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 <teheo@suse.de>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/fs.h>
+
+struct sysfs_open_dirent;
+
+/* type-specific structures for sysfs_dirent->s_* union members */
struct sysfs_elem_dir {
- struct kobject * kobj;
+ struct kobject *kobj;
+ /* children list starts here and goes through sd->s_sibling */
+ struct sysfs_dirent *children;
};
struct sysfs_elem_symlink {
- struct sysfs_dirent * target_sd;
+ struct sysfs_dirent *target_sd;
};
struct sysfs_elem_attr {
- struct attribute * attr;
+ struct attribute *attr;
+ struct sysfs_open_dirent *open;
};
struct sysfs_elem_bin_attr {
- struct bin_attribute * bin_attr;
+ struct bin_attribute *bin_attr;
+ struct hlist_head buffers;
+};
+
+struct sysfs_inode_attrs {
+ struct iattr ia_iattr;
+ void *ia_secdata;
+ u32 ia_secdata_len;
};
/*
+ * 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;
- struct rw_semaphore s_active;
- struct sysfs_dirent * s_parent;
- struct list_head s_sibling;
- struct list_head s_children;
- const char * s_name;
+ atomic_t s_active;
+ struct sysfs_dirent *s_parent;
+ struct sysfs_dirent *s_sibling;
+ const char *s_name;
union {
- struct sysfs_elem_dir dir;
- struct sysfs_elem_symlink symlink;
- struct sysfs_elem_attr attr;
- struct sysfs_elem_bin_attr bin_attr;
- } s_elem;
+ 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;
+ };
- int s_type;
- umode_t s_mode;
+ unsigned int s_flags;
ino_t s_ino;
- struct dentry * s_dentry;
- struct iattr * s_iattr;
- atomic_t s_event;
+ umode_t s_mode;
+ struct sysfs_inode_attrs *s_iattr;
};
-/*
- * A sysfs file which deletes another file when written to need to
- * write lock the s_active of the victim while its s_active is read
- * locked for the write operation. Tell lockdep that this is okay.
- */
-enum sysfs_s_active_class
-{
- SYSFS_S_ACTIVE_NORMAL, /* file r/w access, etc - default */
- SYSFS_S_ACTIVE_DEACTIVATE, /* file deactivation */
-};
+#define SD_DEACTIVATED_BIAS INT_MIN
-extern struct vfsmount * sysfs_mount;
-extern struct kmem_cache *sysfs_dir_cachep;
+#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)
-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 *));
+#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
+#define SYSFS_FLAG_REMOVED 0x0200
-extern void release_sysfs_dirent(struct sysfs_dirent * sd);
-extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
-extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
- int type);
-extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
- struct sysfs_dirent *parent_sd,
- struct dentry *dentry);
+static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
+{
+ return sd->s_flags & SYSFS_TYPE_MASK;
+}
-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);
+/*
+ * Context structure to be used while adding/removing nodes.
+ */
+struct sysfs_addrm_cxt {
+ struct sysfs_dirent *parent_sd;
+ struct inode *parent_inode;
+ struct sysfs_dirent *removed;
+ int cnt;
+};
-extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
-extern void sysfs_remove_subdir(struct dentry *);
+/*
+ * mount.c
+ */
+extern struct sysfs_dirent sysfs_root;
+extern struct super_block *sysfs_sb;
+extern struct kmem_cache *sysfs_dir_cachep;
-extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
-extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
+/*
+ * dir.c
+ */
+extern struct mutex sysfs_mutex;
+extern struct mutex sysfs_rename_mutex;
+extern spinlock_t sysfs_assoc_lock;
-extern spinlock_t sysfs_lock;
-extern spinlock_t kobj_sysfs_assoc_lock;
-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;
-
-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;
-};
-struct sysfs_buffer_collection {
- struct list_head associates;
-};
-
-static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
+struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
+struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
+void sysfs_put_active_two(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);
+
+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);
+
+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)
{
if (sd) {
WARN_ON(!atomic_read(&sd->s_count));
}
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 (sd && atomic_dec_and_test(&sd->s_count))
release_sysfs_dirent(sd);
}
+#define sysfs_put(sd) __sysfs_put(sd)
-/**
- * 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.
+/*
+ * inode.c
*/
-static inline struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
-{
- if (sd) {
- if (unlikely(!down_read_trylock(&sd->s_active)))
- sd = NULL;
- }
- return sd;
-}
+struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
+void sysfs_delete_inode(struct inode *inode);
+int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
+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);
-/**
- * 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.
+/*
+ * file.c
*/
-static inline void sysfs_put_active(struct sysfs_dirent *sd)
-{
- if (sd)
- up_read(&sd->s_active);
-}
+extern const struct file_operations sysfs_file_operations;
-/**
- * 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)
-{
- if (sd) {
- 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;
- }
- }
- return sd;
-}
+int sysfs_add_file(struct sysfs_dirent *dir_sd,
+ const struct attribute *attr, int type);
-/**
- * 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.
+int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
+ const struct attribute *attr, int type, mode_t amode);
+/*
+ * bin.c
*/
-static inline void sysfs_put_active_two(struct sysfs_dirent *sd)
-{
- if (sd) {
- sysfs_put_active(sd);
- sysfs_put_active(sd->s_parent);
- }
-}
+extern const struct file_operations bin_fops;
+void unmap_bin_file(struct sysfs_dirent *attr_sd);
-/**
- * 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.
+/*
+ * symlink.c
*/
-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_);
-}
-
-static inline int sysfs_is_shadowed_inode(struct inode *inode)
-{
- return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
-}
+extern const struct inode_operations sysfs_symlink_inode_operations;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff