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TOMOYO Linux Cross Reference
Linux/fs/autofs/autofs_i.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  *  Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
  4  *  Copyright 2005-2006 Ian Kent <raven@themaw.net>
  5  */
  6 
  7 /* Internal header file for autofs */
  8 
  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 /* This is the range of ioctl() numbers we claim as ours */
 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 
 42 extern struct file_system_type autofs_fs_type;
 43 
 44 /*
 45  * Unified info structure.  This is pointed to by both the dentry and
 46  * inode structures.  Each file in the filesystem has an instance of this
 47  * structure.  It holds a reference to the dentry, so dentries are never
 48  * flushed while the file exists.  All name lookups are dealt with at the
 49  * dentry level, although the filesystem can interfere in the validation
 50  * process.  Readdir is implemented by traversing the dentry lists.
 51  */
 52 struct 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         int active_count;
 62 
 63         struct list_head expiring;
 64 
 65         struct autofs_sb_info *sbi;
 66         unsigned long last_used;
 67         atomic_t count;
 68 
 69         kuid_t uid;
 70         kgid_t gid;
 71         struct rcu_head rcu;
 72 };
 73 
 74 #define AUTOFS_INF_EXPIRING     (1<<0) /* dentry in the process of expiring */
 75 #define AUTOFS_INF_WANT_EXPIRE  (1<<1) /* the dentry is being considered
 76                                         * for expiry, so RCU_walk is
 77                                         * not permitted.  If it progresses to
 78                                         * actual expiry attempt, the flag is
 79                                         * not cleared when EXPIRING is set -
 80                                         * in that case it gets cleared only
 81                                         * when it comes to clearing EXPIRING.
 82                                         */
 83 #define AUTOFS_INF_PENDING      (1<<2) /* dentry pending mount */
 84 
 85 struct autofs_wait_queue {
 86         wait_queue_head_t queue;
 87         struct autofs_wait_queue *next;
 88         autofs_wqt_t wait_queue_token;
 89         /* We use the following to see what we are waiting for */
 90         struct qstr name;
 91         u32 dev;
 92         u64 ino;
 93         kuid_t uid;
 94         kgid_t gid;
 95         pid_t pid;
 96         pid_t tgid;
 97         /* This is for status reporting upon return */
 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 
108 struct 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; /* Wait queue pointer */
125         spinlock_t lookup_lock;
126         struct list_head active_list;
127         struct list_head expiring_list;
128         struct rcu_head rcu;
129 };
130 
131 static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
132 {
133         return (struct autofs_sb_info *)(sb->s_fs_info);
134 }
135 
136 static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry)
137 {
138         return (struct autofs_info *)(dentry->d_fsdata);
139 }
140 
141 /* autofs_oz_mode(): do we see the man behind the curtain?  (The
142  * processes which do manipulations for us in user space sees the raw
143  * filesystem without "magic".)
144  */
145 static 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 
151 struct inode *autofs_get_inode(struct super_block *, umode_t);
152 void autofs_free_ino(struct autofs_info *);
153 
154 /* Expiration */
155 int is_autofs_dentry(struct dentry *);
156 int autofs_expire_wait(const struct path *path, int rcu_walk);
157 int autofs_expire_run(struct super_block *, struct vfsmount *,
158                       struct autofs_sb_info *,
159                       struct autofs_packet_expire __user *);
160 int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
161                            struct autofs_sb_info *sbi, unsigned int how);
162 int autofs_expire_multi(struct super_block *, struct vfsmount *,
163                         struct autofs_sb_info *, int __user *);
164 
165 /* Device node initialization */
166 
167 int autofs_dev_ioctl_init(void);
168 void autofs_dev_ioctl_exit(void);
169 
170 /* Operations structures */
171 
172 extern const struct inode_operations autofs_symlink_inode_operations;
173 extern const struct inode_operations autofs_dir_inode_operations;
174 extern const struct file_operations autofs_dir_operations;
175 extern const struct file_operations autofs_root_operations;
176 extern const struct dentry_operations autofs_dentry_operations;
177 
178 /* VFS automount flags management functions */
179 static inline void __managed_dentry_set_managed(struct dentry *dentry)
180 {
181         dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
182 }
183 
184 static 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 
191 static inline void __managed_dentry_clear_managed(struct dentry *dentry)
192 {
193         dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
194 }
195 
196 static 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 /* Initializing function */
204 
205 int autofs_fill_super(struct super_block *, void *, int);
206 struct autofs_info *autofs_new_ino(struct autofs_sb_info *);
207 void autofs_clean_ino(struct autofs_info *);
208 
209 static 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         /* We want a packet pipe */
216         pipe->f_flags |= O_DIRECT;
217         /* We don't expect -EAGAIN */
218         pipe->f_flags &= ~O_NONBLOCK;
219         return 0;
220 }
221 
222 /* Queue management functions */
223 
224 int autofs_wait(struct autofs_sb_info *,
225                  const struct path *, enum autofs_notify);
226 int autofs_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);
227 void autofs_catatonic_mode(struct autofs_sb_info *);
228 
229 static inline u32 autofs_get_dev(struct autofs_sb_info *sbi)
230 {
231         return new_encode_dev(sbi->sb->s_dev);
232 }
233 
234 static inline u64 autofs_get_ino(struct autofs_sb_info *sbi)
235 {
236         return d_inode(sbi->sb->s_root)->i_ino;
237 }
238 
239 static 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 
250 static 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 
263 static 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 
276 void autofs_kill_sb(struct super_block *);
277 

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