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9#include <linux/auto_fs.h>
10#include <linux/auto_dev-ioctl.h>
11
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/time.h>
15#include <linux/string.h>
16#include <linux/wait.h>
17#include <linux/sched.h>
18#include <linux/sched/signal.h>
19#include <linux/mount.h>
20#include <linux/namei.h>
21#include <linux/uaccess.h>
22#include <linux/mutex.h>
23#include <linux/spinlock.h>
24#include <linux/list.h>
25#include <linux/completion.h>
26#include <linux/file.h>
27#include <linux/magic.h>
28
29
30#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
31#define AUTOFS_IOC_COUNT 32
32
33#define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION)
34#define AUTOFS_DEV_IOCTL_IOC_COUNT \
35 (AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD - AUTOFS_DEV_IOCTL_VERSION_CMD)
36
37#ifdef pr_fmt
38#undef pr_fmt
39#endif
40#define pr_fmt(fmt) KBUILD_MODNAME ":pid:%d:%s: " fmt, current->pid, __func__
41
42extern struct file_system_type autofs_fs_type;
43
44
45
46
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49
50
51
52struct autofs_info {
53 struct dentry *dentry;
54 struct inode *inode;
55
56 int flags;
57
58 struct completion expire_complete;
59
60 struct list_head active;
61
62 struct list_head expiring;
63
64 struct autofs_sb_info *sbi;
65 unsigned long last_used;
66 int count;
67
68 kuid_t uid;
69 kgid_t gid;
70 struct rcu_head rcu;
71};
72
73#define AUTOFS_INF_EXPIRING (1<<0)
74#define AUTOFS_INF_WANT_EXPIRE (1<<1)
75
76
77
78
79
80
81
82#define AUTOFS_INF_PENDING (1<<2)
83
84struct autofs_wait_queue {
85 wait_queue_head_t queue;
86 struct autofs_wait_queue *next;
87 autofs_wqt_t wait_queue_token;
88
89 struct qstr name;
90 u32 offset;
91 u32 dev;
92 u64 ino;
93 kuid_t uid;
94 kgid_t gid;
95 pid_t pid;
96 pid_t tgid;
97
98 int status;
99 unsigned int wait_ctr;
100};
101
102#define AUTOFS_SBI_MAGIC 0x6d4a556d
103
104#define AUTOFS_SBI_CATATONIC 0x0001
105#define AUTOFS_SBI_STRICTEXPIRE 0x0002
106#define AUTOFS_SBI_IGNORE 0x0004
107
108struct autofs_sb_info {
109 u32 magic;
110 int pipefd;
111 struct file *pipe;
112 struct pid *oz_pgrp;
113 int version;
114 int sub_version;
115 int min_proto;
116 int max_proto;
117 unsigned int flags;
118 unsigned long exp_timeout;
119 unsigned int type;
120 struct super_block *sb;
121 struct mutex wq_mutex;
122 struct mutex pipe_mutex;
123 spinlock_t fs_lock;
124 struct autofs_wait_queue *queues;
125 spinlock_t lookup_lock;
126 struct list_head active_list;
127 struct list_head expiring_list;
128 struct rcu_head rcu;
129};
130
131static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
132{
133 return (struct autofs_sb_info *)(sb->s_fs_info);
134}
135
136static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry)
137{
138 return (struct autofs_info *)(dentry->d_fsdata);
139}
140
141
142
143
144
145static inline int autofs_oz_mode(struct autofs_sb_info *sbi)
146{
147 return ((sbi->flags & AUTOFS_SBI_CATATONIC) ||
148 task_pgrp(current) == sbi->oz_pgrp);
149}
150
151struct inode *autofs_get_inode(struct super_block *, umode_t);
152void autofs_free_ino(struct autofs_info *);
153
154
155int is_autofs_dentry(struct dentry *);
156int autofs_expire_wait(const struct path *path, int rcu_walk);
157int autofs_expire_run(struct super_block *, struct vfsmount *,
158 struct autofs_sb_info *,
159 struct autofs_packet_expire __user *);
160int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
161 struct autofs_sb_info *sbi, unsigned int how);
162int autofs_expire_multi(struct super_block *, struct vfsmount *,
163 struct autofs_sb_info *, int __user *);
164
165
166
167int autofs_dev_ioctl_init(void);
168void autofs_dev_ioctl_exit(void);
169
170
171
172extern const struct inode_operations autofs_symlink_inode_operations;
173extern const struct inode_operations autofs_dir_inode_operations;
174extern const struct file_operations autofs_dir_operations;
175extern const struct file_operations autofs_root_operations;
176extern const struct dentry_operations autofs_dentry_operations;
177
178
179static inline void __managed_dentry_set_managed(struct dentry *dentry)
180{
181 dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
182}
183
184static inline void managed_dentry_set_managed(struct dentry *dentry)
185{
186 spin_lock(&dentry->d_lock);
187 __managed_dentry_set_managed(dentry);
188 spin_unlock(&dentry->d_lock);
189}
190
191static inline void __managed_dentry_clear_managed(struct dentry *dentry)
192{
193 dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
194}
195
196static inline void managed_dentry_clear_managed(struct dentry *dentry)
197{
198 spin_lock(&dentry->d_lock);
199 __managed_dentry_clear_managed(dentry);
200 spin_unlock(&dentry->d_lock);
201}
202
203
204
205int autofs_fill_super(struct super_block *, void *, int);
206struct autofs_info *autofs_new_ino(struct autofs_sb_info *);
207void autofs_clean_ino(struct autofs_info *);
208
209static inline int autofs_prepare_pipe(struct file *pipe)
210{
211 if (!(pipe->f_mode & FMODE_CAN_WRITE))
212 return -EINVAL;
213 if (!S_ISFIFO(file_inode(pipe)->i_mode))
214 return -EINVAL;
215
216 pipe->f_flags |= O_DIRECT;
217
218 pipe->f_flags &= ~O_NONBLOCK;
219 return 0;
220}
221
222
223
224int autofs_wait(struct autofs_sb_info *,
225 const struct path *, enum autofs_notify);
226int autofs_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);
227void autofs_catatonic_mode(struct autofs_sb_info *);
228
229static inline u32 autofs_get_dev(struct autofs_sb_info *sbi)
230{
231 return new_encode_dev(sbi->sb->s_dev);
232}
233
234static inline u64 autofs_get_ino(struct autofs_sb_info *sbi)
235{
236 return d_inode(sbi->sb->s_root)->i_ino;
237}
238
239static inline void __autofs_add_expiring(struct dentry *dentry)
240{
241 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
242 struct autofs_info *ino = autofs_dentry_ino(dentry);
243
244 if (ino) {
245 if (list_empty(&ino->expiring))
246 list_add(&ino->expiring, &sbi->expiring_list);
247 }
248}
249
250static inline void autofs_add_expiring(struct dentry *dentry)
251{
252 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
253 struct autofs_info *ino = autofs_dentry_ino(dentry);
254
255 if (ino) {
256 spin_lock(&sbi->lookup_lock);
257 if (list_empty(&ino->expiring))
258 list_add(&ino->expiring, &sbi->expiring_list);
259 spin_unlock(&sbi->lookup_lock);
260 }
261}
262
263static inline void autofs_del_expiring(struct dentry *dentry)
264{
265 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
266 struct autofs_info *ino = autofs_dentry_ino(dentry);
267
268 if (ino) {
269 spin_lock(&sbi->lookup_lock);
270 if (!list_empty(&ino->expiring))
271 list_del_init(&ino->expiring);
272 spin_unlock(&sbi->lookup_lock);
273 }
274}
275
276void autofs_kill_sb(struct super_block *);
277