116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
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/*
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* fs/kernfs/kernfs-internal.h - kernfs 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, 2013 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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#ifndef __KERNFS_INTERNAL_H
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#define __KERNFS_INTERNAL_H
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#include <linux/lockdep.h>
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#include <linux/fs.h>
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#include <linux/rbtree.h>
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#include <linux/kernfs.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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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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const struct kernfs_ops *ops;
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struct sysfs_open_dirent *open;
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loff_t size;
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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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};
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void *priv;
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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 0x000f
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#define SYSFS_DIR 0x0001
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#define SYSFS_KOBJ_ATTR 0x0002
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#define SYSFS_KOBJ_LINK 0x0004
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#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
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#define SYSFS_ACTIVE_REF SYSFS_KOBJ_ATTR
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#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
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#define SYSFS_FLAG_REMOVED 0x0010
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#define SYSFS_FLAG_NS 0x0020
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#define SYSFS_FLAG_HAS_SEQ_SHOW 0x0040
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#define SYSFS_FLAG_HAS_MMAP 0x0080
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#define SYSFS_FLAG_LOCKDEP 0x0100
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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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/*
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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 *removed;
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};
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#include "../sysfs/sysfs.h"
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#endif /* __KERNFS_INTERNAL_H */
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