mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
172 lines
4.5 KiB
172 lines
4.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* fs/kernfs/kernfs-internal.h - kernfs internal header file |
|
* |
|
* Copyright (c) 2001-3 Patrick Mochel |
|
* Copyright (c) 2007 SUSE Linux Products GmbH |
|
* Copyright (c) 2007, 2013 Tejun Heo <[email protected]> |
|
*/ |
|
|
|
#ifndef __KERNFS_INTERNAL_H |
|
#define __KERNFS_INTERNAL_H |
|
|
|
#include <linux/lockdep.h> |
|
#include <linux/fs.h> |
|
#include <linux/mutex.h> |
|
#include <linux/rwsem.h> |
|
#include <linux/xattr.h> |
|
|
|
#include <linux/kernfs.h> |
|
#include <linux/fs_context.h> |
|
|
|
struct kernfs_iattrs { |
|
kuid_t ia_uid; |
|
kgid_t ia_gid; |
|
struct timespec64 ia_atime; |
|
struct timespec64 ia_mtime; |
|
struct timespec64 ia_ctime; |
|
|
|
struct simple_xattrs xattrs; |
|
atomic_t nr_user_xattrs; |
|
atomic_t user_xattr_size; |
|
}; |
|
|
|
struct kernfs_root { |
|
/* published fields */ |
|
struct kernfs_node *kn; |
|
unsigned int flags; /* KERNFS_ROOT_* flags */ |
|
|
|
/* private fields, do not use outside kernfs proper */ |
|
struct idr ino_idr; |
|
u32 last_id_lowbits; |
|
u32 id_highbits; |
|
struct kernfs_syscall_ops *syscall_ops; |
|
|
|
/* list of kernfs_super_info of this root, protected by kernfs_rwsem */ |
|
struct list_head supers; |
|
|
|
wait_queue_head_t deactivate_waitq; |
|
struct rw_semaphore kernfs_rwsem; |
|
}; |
|
|
|
/* +1 to avoid triggering overflow warning when negating it */ |
|
#define KN_DEACTIVATED_BIAS (INT_MIN + 1) |
|
|
|
/* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */ |
|
|
|
/** |
|
* kernfs_root - find out the kernfs_root a kernfs_node belongs to |
|
* @kn: kernfs_node of interest |
|
* |
|
* Return the kernfs_root @kn belongs to. |
|
*/ |
|
static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn) |
|
{ |
|
/* if parent exists, it's always a dir; otherwise, @sd is a dir */ |
|
if (kn->parent) |
|
kn = kn->parent; |
|
return kn->dir.root; |
|
} |
|
|
|
/* |
|
* mount.c |
|
*/ |
|
struct kernfs_super_info { |
|
struct super_block *sb; |
|
|
|
/* |
|
* The root associated with this super_block. Each super_block is |
|
* identified by the root and ns it's associated with. |
|
*/ |
|
struct kernfs_root *root; |
|
|
|
/* |
|
* Each sb is associated with one namespace tag, currently the |
|
* network namespace of the task which mounted this kernfs |
|
* instance. If multiple tags become necessary, make the following |
|
* an array and compare kernfs_node tag against every entry. |
|
*/ |
|
const void *ns; |
|
|
|
/* anchored at kernfs_root->supers, protected by kernfs_rwsem */ |
|
struct list_head node; |
|
}; |
|
#define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info)) |
|
|
|
static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry) |
|
{ |
|
if (d_really_is_negative(dentry)) |
|
return NULL; |
|
return d_inode(dentry)->i_private; |
|
} |
|
|
|
static inline void kernfs_set_rev(struct kernfs_node *parent, |
|
struct dentry *dentry) |
|
{ |
|
dentry->d_time = parent->dir.rev; |
|
} |
|
|
|
static inline void kernfs_inc_rev(struct kernfs_node *parent) |
|
{ |
|
parent->dir.rev++; |
|
} |
|
|
|
static inline bool kernfs_dir_changed(struct kernfs_node *parent, |
|
struct dentry *dentry) |
|
{ |
|
if (parent->dir.rev != dentry->d_time) |
|
return true; |
|
return false; |
|
} |
|
|
|
extern const struct super_operations kernfs_sops; |
|
extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache; |
|
|
|
/* |
|
* inode.c |
|
*/ |
|
extern const struct xattr_handler *kernfs_xattr_handlers[]; |
|
void kernfs_evict_inode(struct inode *inode); |
|
int kernfs_iop_permission(struct user_namespace *mnt_userns, |
|
struct inode *inode, int mask); |
|
int kernfs_iop_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
|
struct iattr *iattr); |
|
int kernfs_iop_getattr(struct user_namespace *mnt_userns, |
|
const struct path *path, struct kstat *stat, |
|
u32 request_mask, unsigned int query_flags); |
|
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size); |
|
int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); |
|
|
|
/* |
|
* dir.c |
|
*/ |
|
extern const struct dentry_operations kernfs_dops; |
|
extern const struct file_operations kernfs_dir_fops; |
|
extern const struct inode_operations kernfs_dir_iops; |
|
|
|
struct kernfs_node *kernfs_get_active(struct kernfs_node *kn); |
|
void kernfs_put_active(struct kernfs_node *kn); |
|
int kernfs_add_one(struct kernfs_node *kn); |
|
struct kernfs_node *kernfs_new_node(struct kernfs_node *parent, |
|
const char *name, umode_t mode, |
|
kuid_t uid, kgid_t gid, |
|
unsigned flags); |
|
|
|
/* |
|
* file.c |
|
*/ |
|
extern const struct file_operations kernfs_file_fops; |
|
|
|
bool kernfs_should_drain_open_files(struct kernfs_node *kn); |
|
void kernfs_drain_open_files(struct kernfs_node *kn); |
|
|
|
/* |
|
* symlink.c |
|
*/ |
|
extern const struct inode_operations kernfs_symlink_iops; |
|
|
|
/* |
|
* kernfs locks |
|
*/ |
|
extern struct kernfs_global_locks *kernfs_locks; |
|
#endif /* __KERNFS_INTERNAL_H */
|
|
|