kernel-fxtec-pro1x/include/linux/fs_struct.h
Miklos Szeredi f7ad3c6be9 vfs: add helpers to get root and pwd
Add three helpers that retrieve a refcounted copy of the root and cwd
from the supplied fs_struct.

 get_fs_root()
 get_fs_pwd()
 get_fs_root_and_pwd()

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-11 00:28:20 -04:00

51 lines
1.1 KiB
C

#ifndef _LINUX_FS_STRUCT_H
#define _LINUX_FS_STRUCT_H
#include <linux/path.h>
struct fs_struct {
int users;
rwlock_t lock;
int umask;
int in_exec;
struct path root, pwd;
};
extern struct kmem_cache *fs_cachep;
extern void exit_fs(struct task_struct *);
extern void set_fs_root(struct fs_struct *, struct path *);
extern void set_fs_pwd(struct fs_struct *, struct path *);
extern struct fs_struct *copy_fs_struct(struct fs_struct *);
extern void free_fs_struct(struct fs_struct *);
extern void daemonize_fs_struct(void);
extern int unshare_fs_struct(void);
static inline void get_fs_root(struct fs_struct *fs, struct path *root)
{
read_lock(&fs->lock);
*root = fs->root;
path_get(root);
read_unlock(&fs->lock);
}
static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
{
read_lock(&fs->lock);
*pwd = fs->pwd;
path_get(pwd);
read_unlock(&fs->lock);
}
static inline void get_fs_root_and_pwd(struct fs_struct *fs, struct path *root,
struct path *pwd)
{
read_lock(&fs->lock);
*root = fs->root;
path_get(root);
*pwd = fs->pwd;
path_get(pwd);
read_unlock(&fs->lock);
}
#endif /* _LINUX_FS_STRUCT_H */