74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_FS_STRUCT_H
|
|
#define _LINUX_FS_STRUCT_H
|
|
|
|
#include <linux/path.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/seqlock.h>
|
|
|
|
struct fs_struct {
|
|
int users;
|
|
spinlock_t lock;
|
|
seqcount_t seq;
|
|
int umask;
|
|
int in_exec;
|
|
RH_KABI_FILL_HOLE(int pwd_refs) /* A pool of extra pwd references */
|
|
struct path root, pwd;
|
|
} __randomize_layout;
|
|
|
|
extern struct kmem_cache *fs_cachep;
|
|
|
|
extern void exit_fs(struct task_struct *);
|
|
extern void set_fs_root(struct fs_struct *, const struct path *);
|
|
extern void set_fs_pwd(struct fs_struct *, const struct path *);
|
|
extern struct fs_struct *copy_fs_struct(struct fs_struct *);
|
|
extern void free_fs_struct(struct fs_struct *);
|
|
extern int unshare_fs_struct(void);
|
|
|
|
static inline void get_fs_root(struct fs_struct *fs, struct path *root)
|
|
{
|
|
spin_lock(&fs->lock);
|
|
*root = fs->root;
|
|
path_get(root);
|
|
spin_unlock(&fs->lock);
|
|
}
|
|
|
|
static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
|
|
{
|
|
spin_lock(&fs->lock);
|
|
*pwd = fs->pwd;
|
|
path_get(pwd);
|
|
spin_unlock(&fs->lock);
|
|
}
|
|
|
|
/* Acquire a pwd reference from the pwd_refs pool, if available */
|
|
static inline void get_fs_pwd_pool(struct fs_struct *fs, struct path *pwd)
|
|
{
|
|
spin_lock(&fs->lock);
|
|
*pwd = fs->pwd;
|
|
if (fs->pwd_refs)
|
|
fs->pwd_refs--;
|
|
else
|
|
path_get(pwd);
|
|
spin_unlock(&fs->lock);
|
|
}
|
|
|
|
/* Release a pwd reference back to the pwd_refs pool, if appropriate */
|
|
static inline void put_fs_pwd_pool(struct fs_struct *fs, struct path *pwd)
|
|
{
|
|
bool put = false;
|
|
|
|
spin_lock(&fs->lock);
|
|
if ((fs->pwd.dentry == pwd->dentry) && (fs->pwd.mnt == pwd->mnt))
|
|
fs->pwd_refs++;
|
|
else
|
|
put = true;
|
|
spin_unlock(&fs->lock);
|
|
if (put)
|
|
path_put(pwd);
|
|
}
|
|
|
|
extern bool current_chrooted(void);
|
|
|
|
#endif /* _LINUX_FS_STRUCT_H */
|