cf9e5a73aa
sysfs_dirent includes some information which should be available to
kernfs users - the type, flags, name and parent pointer. This patch
moves sysfs_dirent definition from kernfs/kernfs-internal.h to
include/linux/kernfs.h so that kernfs users can access them.
The type part of flags is exported as enum kernfs_node_type, the flags
kernfs_node_flag, sysfs_type() and kernfs_enable_ns() are moved to
include/linux/kernfs.h and the former is updated to return the enum
type. sysfs_dirent->s_parent and ->s_name are marked explicitly as
public.
This patch doesn't introduce any functional changes.
v2: Flags exported too and kernfs_enable_ns() definition moved.
v3: While moving kernfs_enable_ns() to include/linux/kernfs.h, v1 and
v2 put the definition outside CONFIG_SYSFS replacing the dummy
implementation with the actual implementation too. Unfortunately,
this can lead to oops when !CONFIG_SYSFS because
kernfs_enable_ns() may be called on a NULL @sd and now tries to
dereference @sd instead of not doing anything. This issue was
reported by Yuanhan Liu.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*
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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/mutex.h>
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#include <linux/kernfs.h>
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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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#define SD_DEACTIVATED_BIAS INT_MIN
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/* SYSFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
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/**
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* kernfs_root - find out the kernfs_root a sysfs_dirent belongs to
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* @sd: sysfs_dirent of interest
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*
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* Return the kernfs_root @sd belongs to.
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*/
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static inline struct kernfs_root *kernfs_root(struct sysfs_dirent *sd)
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{
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/* if parent exists, it's always a dir; otherwise, @sd is a dir */
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if (sd->s_parent)
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sd = sd->s_parent;
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return sd->s_dir.root;
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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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/*
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* mount.c
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*/
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struct sysfs_super_info {
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/*
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* The root associated with this super_block. Each super_block is
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* identified by the root and ns it's associated with.
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*/
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struct kernfs_root *root;
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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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const 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 kmem_cache *sysfs_dir_cachep;
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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_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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void sysfs_inode_init(void);
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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 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 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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int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
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struct sysfs_dirent *parent_sd);
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void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
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struct sysfs_dirent *sysfs_new_dirent(struct kernfs_root *root,
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const char *name, umode_t mode, int type);
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/*
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* file.c
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*/
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extern const struct file_operations kernfs_file_operations;
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void sysfs_unmap_bin_file(struct sysfs_dirent *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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#endif /* __KERNFS_INTERNAL_H */
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