1 #include <linux/module.h>
2 #include <linux/sched.h>
4 #include <linux/path.h>
5 #include <linux/slab.h>
6 #include <linux/fs_struct.h>
9 * Replace the fs->{rootmnt,root} with {mnt,dentry}. Put the old values.
12 void set_fs_root(struct fs_struct
*fs
, struct path
*path
)
20 spin_unlock(&fs
->lock
);
26 * Replace the fs->{pwdmnt,pwd} with {mnt,dentry}. Put the old values.
29 void set_fs_pwd(struct fs_struct
*fs
, struct path
*path
)
37 spin_unlock(&fs
->lock
);
43 void chroot_fs_refs(struct path
*old_root
, struct path
*new_root
)
45 struct task_struct
*g
, *p
;
49 read_lock(&tasklist_lock
);
50 do_each_thread(g
, p
) {
55 if (fs
->root
.dentry
== old_root
->dentry
56 && fs
->root
.mnt
== old_root
->mnt
) {
61 if (fs
->pwd
.dentry
== old_root
->dentry
62 && fs
->pwd
.mnt
== old_root
->mnt
) {
67 spin_unlock(&fs
->lock
);
70 } while_each_thread(g
, p
);
71 read_unlock(&tasklist_lock
);
76 void free_fs_struct(struct fs_struct
*fs
)
80 kmem_cache_free(fs_cachep
, fs
);
83 void exit_fs(struct task_struct
*tsk
)
85 struct fs_struct
*fs
= tsk
->fs
;
93 spin_unlock(&fs
->lock
);
100 struct fs_struct
*copy_fs_struct(struct fs_struct
*old
)
102 struct fs_struct
*fs
= kmem_cache_alloc(fs_cachep
, GFP_KERNEL
);
103 /* We don't need to lock fs - think why ;-) */
107 spin_lock_init(&fs
->lock
);
108 fs
->umask
= old
->umask
;
109 get_fs_root_and_pwd(old
, &fs
->root
, &fs
->pwd
);
114 int unshare_fs_struct(void)
116 struct fs_struct
*fs
= current
->fs
;
117 struct fs_struct
*new_fs
= copy_fs_struct(fs
);
124 spin_lock(&fs
->lock
);
126 current
->fs
= new_fs
;
127 spin_unlock(&fs
->lock
);
128 task_unlock(current
);
135 EXPORT_SYMBOL_GPL(unshare_fs_struct
);
137 int current_umask(void)
139 return current
->fs
->umask
;
141 EXPORT_SYMBOL(current_umask
);
143 /* to be mentioned only in INIT_TASK */
144 struct fs_struct init_fs
= {
146 .lock
= __SPIN_LOCK_UNLOCKED(init_fs
.lock
),
150 void daemonize_fs_struct(void)
152 struct fs_struct
*fs
= current
->fs
;
159 spin_lock(&init_fs
.lock
);
161 spin_unlock(&init_fs
.lock
);
163 spin_lock(&fs
->lock
);
164 current
->fs
= &init_fs
;
166 spin_unlock(&fs
->lock
);
168 task_unlock(current
);
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