388975ccca
The pre-existing sysfs interfaces which take explicit namespace
argument are weird in that they place the optional @ns in front of
@name which is contrary to the established convention. For example,
we end up forcing vast majority of sysfs_get_dirent() users to do
sysfs_get_dirent(parent, NULL, name), which is silly and error-prone
especially as @ns and @name may be interchanged without causing
compilation warning.
This renames sysfs_get_dirent() to sysfs_get_dirent_ns() and swap the
positions of @name and @ns, and sysfs_get_dirent() is now a wrapper
around sysfs_get_dirent_ns(). This makes confusions a lot less
likely.
There are other interfaces which take @ns before @name. They'll be
updated by following patches.
This patch doesn't introduce any functional changes.
v2: EXPORT_SYMBOL_GPL() wasn't updated leading to undefined symbol
error on module builds. Reported by build test robot. Fixed.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kay Sievers <kay@vrfy.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
233 lines
6.3 KiB
C
233 lines
6.3 KiB
C
/*
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* fs/sysfs/sysfs.h - sysfs internal header file
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*
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* Copyright (c) 2001-3 Patrick Mochel
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* Copyright (c) 2007 SUSE Linux Products GmbH
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* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/lockdep.h>
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#include <linux/kobject_ns.h>
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#include <linux/fs.h>
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#include <linux/rbtree.h>
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struct sysfs_open_dirent;
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/* type-specific structures for sysfs_dirent->s_* union members */
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struct sysfs_elem_dir {
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struct kobject *kobj;
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unsigned long subdirs;
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/* children rbtree starts here and goes through sd->s_rb */
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struct rb_root children;
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};
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struct sysfs_elem_symlink {
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struct sysfs_dirent *target_sd;
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};
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struct sysfs_elem_attr {
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struct attribute *attr;
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struct sysfs_open_dirent *open;
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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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struct hlist_head buffers;
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};
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struct sysfs_inode_attrs {
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struct iattr ia_iattr;
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void *ia_secdata;
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u32 ia_secdata_len;
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};
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/*
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* sysfs_dirent - the building block of sysfs hierarchy. Each and
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* every sysfs node is represented by single sysfs_dirent.
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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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struct sysfs_dirent {
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atomic_t s_count;
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atomic_t s_active;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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struct sysfs_dirent *s_parent;
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const char *s_name;
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struct rb_node s_rb;
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union {
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struct completion *completion;
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struct sysfs_dirent *removed_list;
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} u;
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const void *s_ns; /* namespace tag */
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unsigned int s_hash; /* ns + name hash */
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union {
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struct sysfs_elem_dir s_dir;
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struct sysfs_elem_symlink s_symlink;
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struct sysfs_elem_attr s_attr;
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struct sysfs_elem_bin_attr s_bin_attr;
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};
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unsigned short s_flags;
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umode_t s_mode;
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unsigned int s_ino;
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struct sysfs_inode_attrs *s_iattr;
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};
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#define SD_DEACTIVATED_BIAS INT_MIN
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#define SYSFS_TYPE_MASK 0x00ff
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#define SYSFS_DIR 0x0001
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#define SYSFS_KOBJ_ATTR 0x0002
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#define SYSFS_KOBJ_BIN_ATTR 0x0004
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#define SYSFS_KOBJ_LINK 0x0008
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#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
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#define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR)
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#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
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#define SYSFS_FLAG_HAS_NS 0x01000
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#define SYSFS_FLAG_REMOVED 0x02000
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static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
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{
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return sd->s_flags & SYSFS_TYPE_MASK;
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}
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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#define sysfs_dirent_init_lockdep(sd) \
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do { \
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struct attribute *attr = sd->s_attr.attr; \
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struct lock_class_key *key = attr->key; \
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if (!key) \
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key = &attr->skey; \
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\
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lockdep_init_map(&sd->dep_map, "s_active", key, 0); \
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} while (0)
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#else
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#define sysfs_dirent_init_lockdep(sd) do {} while (0)
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#endif
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/*
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* Context structure to be used while adding/removing nodes.
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*/
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struct sysfs_addrm_cxt {
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struct sysfs_dirent *parent_sd;
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struct sysfs_dirent *removed;
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};
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/*
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* mount.c
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*/
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/*
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* Each sb is associated with one namespace tag, currently the network
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* namespace of the task which mounted this sysfs instance. If multiple
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* tags become necessary, make the following an array and compare
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* sysfs_dirent tag against every entry.
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*/
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struct sysfs_super_info {
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void *ns;
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};
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#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
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extern struct sysfs_dirent sysfs_root;
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extern struct kmem_cache *sysfs_dir_cachep;
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/*
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* dir.c
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*/
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extern struct mutex sysfs_mutex;
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extern spinlock_t sysfs_assoc_lock;
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extern const struct dentry_operations sysfs_dentry_ops;
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extern const struct file_operations sysfs_dir_operations;
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extern const struct inode_operations sysfs_dir_inode_operations;
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struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
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struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
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void sysfs_put_active(struct sysfs_dirent *sd);
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void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
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struct sysfs_dirent *parent_sd);
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int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
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int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
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void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
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void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
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struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
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const void *ns,
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const unsigned char *name);
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struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
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void release_sysfs_dirent(struct sysfs_dirent *sd);
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int sysfs_create_subdir(struct kobject *kobj, const char *name,
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struct sysfs_dirent **p_sd);
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void sysfs_remove_subdir(struct sysfs_dirent *sd);
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int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
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const void *ns, const char *new_name);
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static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
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{
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if (sd) {
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WARN_ON(!atomic_read(&sd->s_count));
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atomic_inc(&sd->s_count);
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}
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return sd;
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}
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#define sysfs_get(sd) __sysfs_get(sd)
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static inline void __sysfs_put(struct sysfs_dirent *sd)
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{
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if (sd && atomic_dec_and_test(&sd->s_count))
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release_sysfs_dirent(sd);
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}
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#define sysfs_put(sd) __sysfs_put(sd)
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/*
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* inode.c
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*/
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struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd);
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void sysfs_evict_inode(struct inode *inode);
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int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr);
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int sysfs_permission(struct inode *inode, int mask);
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int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
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int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
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struct kstat *stat);
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int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
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size_t size, int flags);
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int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const void *ns,
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const char *name);
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int sysfs_inode_init(void);
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/*
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* file.c
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*/
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extern const struct file_operations sysfs_file_operations;
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int sysfs_add_file(struct sysfs_dirent *dir_sd,
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const struct attribute *attr, int type);
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int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
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const struct attribute *attr, int type,
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umode_t amode, const void *ns);
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/*
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* bin.c
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*/
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extern const struct file_operations bin_fops;
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void unmap_bin_file(struct sysfs_dirent *attr_sd);
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/*
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* symlink.c
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*/
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extern const struct inode_operations sysfs_symlink_inode_operations;
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int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,
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const char *name);
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