~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
  3  *  Copyright 2005-2006 Ian Kent <raven@themaw.net>
  4  *
  5  * This file is part of the Linux kernel and is made available under
  6  * the terms of the GNU General Public License, version 2, or at your
  7  * option, any later version, incorporated herein by reference.
  8  */
  9 
 10 /* Internal header file for autofs */
 11 
 12 #include <linux/auto_fs.h>
 13 #include <linux/auto_dev-ioctl.h>
 14 
 15 #include <linux/kernel.h>
 16 #include <linux/slab.h>
 17 #include <linux/time.h>
 18 #include <linux/string.h>
 19 #include <linux/wait.h>
 20 #include <linux/sched.h>
 21 #include <linux/sched/signal.h>
 22 #include <linux/mount.h>
 23 #include <linux/namei.h>
 24 #include <linux/uaccess.h>
 25 #include <linux/mutex.h>
 26 #include <linux/spinlock.h>
 27 #include <linux/list.h>
 28 #include <linux/completion.h>
 29 #include <linux/file.h>
 30 #include <linux/magic.h>
 31 
 32 /* This is the range of ioctl() numbers we claim as ours */
 33 #define AUTOFS_IOC_FIRST     AUTOFS_IOC_READY
 34 #define AUTOFS_IOC_COUNT     32
 35 
 36 #define AUTOFS_DEV_IOCTL_IOC_FIRST      (AUTOFS_DEV_IOCTL_VERSION)
 37 #define AUTOFS_DEV_IOCTL_IOC_COUNT \
 38         (AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD - AUTOFS_DEV_IOCTL_VERSION_CMD)
 39 
 40 #ifdef pr_fmt
 41 #undef pr_fmt
 42 #endif
 43 #define pr_fmt(fmt) KBUILD_MODNAME ":pid:%d:%s: " fmt, current->pid, __func__
 44 
 45 extern struct file_system_type autofs_fs_type;
 46 
 47 /*
 48  * Unified info structure.  This is pointed to by both the dentry and
 49  * inode structures.  Each file in the filesystem has an instance of this
 50  * structure.  It holds a reference to the dentry, so dentries are never
 51  * flushed while the file exists.  All name lookups are dealt with at the
 52  * dentry level, although the filesystem can interfere in the validation
 53  * process.  Readdir is implemented by traversing the dentry lists.
 54  */
 55 struct autofs_info {
 56         struct dentry   *dentry;
 57         struct inode    *inode;
 58 
 59         int             flags;
 60 
 61         struct completion expire_complete;
 62 
 63         struct list_head active;
 64         int active_count;
 65 
 66         struct list_head expiring;
 67 
 68         struct autofs_sb_info *sbi;
 69         unsigned long last_used;
 70         atomic_t count;
 71 
 72         kuid_t uid;
 73         kgid_t gid;
 74 };
 75 
 76 #define AUTOFS_INF_EXPIRING     (1<<0) /* dentry in the process of expiring */
 77 #define AUTOFS_INF_WANT_EXPIRE  (1<<1) /* the dentry is being considered
 78                                         * for expiry, so RCU_walk is
 79                                         * not permitted.  If it progresses to
 80                                         * actual expiry attempt, the flag is
 81                                         * not cleared when EXPIRING is set -
 82                                         * in that case it gets cleared only
 83                                         * when it comes to clearing EXPIRING.
 84                                         */
 85 #define AUTOFS_INF_PENDING      (1<<2) /* dentry pending mount */
 86 
 87 struct autofs_wait_queue {
 88         wait_queue_head_t queue;
 89         struct autofs_wait_queue *next;
 90         autofs_wqt_t wait_queue_token;
 91         /* We use the following to see what we are waiting for */
 92         struct qstr name;
 93         u32 dev;
 94         u64 ino;
 95         kuid_t uid;
 96         kgid_t gid;
 97         pid_t pid;
 98         pid_t tgid;
 99         /* This is for status reporting upon return */
100         int status;
101         unsigned int wait_ctr;
102 };
103 
104 #define AUTOFS_SBI_MAGIC 0x6d4a556d
105 
106 #define AUTOFS_SBI_CATATONIC    0x0001
107 #define AUTOFS_SBI_STRICTEXPIRE 0x0002
108 
109 struct autofs_sb_info {
110         u32 magic;
111         int pipefd;
112         struct file *pipe;
113         struct pid *oz_pgrp;
114         int version;
115         int sub_version;
116         int min_proto;
117         int max_proto;
118         unsigned int flags;
119         unsigned long exp_timeout;
120         unsigned int type;
121         struct super_block *sb;
122         struct mutex wq_mutex;
123         struct mutex pipe_mutex;
124         spinlock_t fs_lock;
125         struct autofs_wait_queue *queues; /* Wait queue pointer */
126         spinlock_t lookup_lock;
127         struct list_head active_list;
128         struct list_head expiring_list;
129         struct rcu_head rcu;
130 };
131 
132 static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
133 {
134         return (struct autofs_sb_info *)(sb->s_fs_info);
135 }
136 
137 static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry)
138 {
139         return (struct autofs_info *)(dentry->d_fsdata);
140 }
141 
142 /* autofs_oz_mode(): do we see the man behind the curtain?  (The
143  * processes which do manipulations for us in user space sees the raw
144  * filesystem without "magic".)
145  */
146 static inline int autofs_oz_mode(struct autofs_sb_info *sbi)
147 {
148         return ((sbi->flags & AUTOFS_SBI_CATATONIC) ||
149                  task_pgrp(current) == sbi->oz_pgrp);
150 }
151 
152 struct inode *autofs_get_inode(struct super_block *, umode_t);
153 void autofs_free_ino(struct autofs_info *);
154 
155 /* Expiration */
156 int is_autofs_dentry(struct dentry *);
157 int autofs_expire_wait(const struct path *path, int rcu_walk);
158 int autofs_expire_run(struct super_block *, struct vfsmount *,
159                       struct autofs_sb_info *,
160                       struct autofs_packet_expire __user *);
161 int autofs_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
162                            struct autofs_sb_info *sbi, unsigned int how);
163 int autofs_expire_multi(struct super_block *, struct vfsmount *,
164                         struct autofs_sb_info *, int __user *);
165 
166 /* Device node initialization */
167 
168 int autofs_dev_ioctl_init(void);
169 void autofs_dev_ioctl_exit(void);
170 
171 /* Operations structures */
172 
173 extern const struct inode_operations autofs_symlink_inode_operations;
174 extern const struct inode_operations autofs_dir_inode_operations;
175 extern const struct file_operations autofs_dir_operations;
176 extern const struct file_operations autofs_root_operations;
177 extern const struct dentry_operations autofs_dentry_operations;
178 
179 /* VFS automount flags management functions */
180 static inline void __managed_dentry_set_managed(struct dentry *dentry)
181 {
182         dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
183 }
184 
185 static inline void managed_dentry_set_managed(struct dentry *dentry)
186 {
187         spin_lock(&dentry->d_lock);
188         __managed_dentry_set_managed(dentry);
189         spin_unlock(&dentry->d_lock);
190 }
191 
192 static inline void __managed_dentry_clear_managed(struct dentry *dentry)
193 {
194         dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
195 }
196 
197 static inline void managed_dentry_clear_managed(struct dentry *dentry)
198 {
199         spin_lock(&dentry->d_lock);
200         __managed_dentry_clear_managed(dentry);
201         spin_unlock(&dentry->d_lock);
202 }
203 
204 /* Initializing function */
205 
206 int autofs_fill_super(struct super_block *, void *, int);
207 struct autofs_info *autofs_new_ino(struct autofs_sb_info *);
208 void autofs_clean_ino(struct autofs_info *);
209 
210 static inline int autofs_prepare_pipe(struct file *pipe)
211 {
212         if (!(pipe->f_mode & FMODE_CAN_WRITE))
213                 return -EINVAL;
214         if (!S_ISFIFO(file_inode(pipe)->i_mode))
215                 return -EINVAL;
216         /* We want a packet pipe */
217         pipe->f_flags |= O_DIRECT;
218         return 0;
219 }
220 
221 /* Queue management functions */
222 
223 int autofs_wait(struct autofs_sb_info *,
224                  const struct path *, enum autofs_notify);
225 int autofs_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);
226 void autofs_catatonic_mode(struct autofs_sb_info *);
227 
228 static inline u32 autofs_get_dev(struct autofs_sb_info *sbi)
229 {
230         return new_encode_dev(sbi->sb->s_dev);
231 }
232 
233 static inline u64 autofs_get_ino(struct autofs_sb_info *sbi)
234 {
235         return d_inode(sbi->sb->s_root)->i_ino;
236 }
237 
238 static inline void __autofs_add_expiring(struct dentry *dentry)
239 {
240         struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
241         struct autofs_info *ino = autofs_dentry_ino(dentry);
242 
243         if (ino) {
244                 if (list_empty(&ino->expiring))
245                         list_add(&ino->expiring, &sbi->expiring_list);
246         }
247 }
248 
249 static inline void autofs_add_expiring(struct dentry *dentry)
250 {
251         struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
252         struct autofs_info *ino = autofs_dentry_ino(dentry);
253 
254         if (ino) {
255                 spin_lock(&sbi->lookup_lock);
256                 if (list_empty(&ino->expiring))
257                         list_add(&ino->expiring, &sbi->expiring_list);
258                 spin_unlock(&sbi->lookup_lock);
259         }
260 }
261 
262 static inline void autofs_del_expiring(struct dentry *dentry)
263 {
264         struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
265         struct autofs_info *ino = autofs_dentry_ino(dentry);
266 
267         if (ino) {
268                 spin_lock(&sbi->lookup_lock);
269                 if (!list_empty(&ino->expiring))
270                         list_del_init(&ino->expiring);
271                 spin_unlock(&sbi->lookup_lock);
272         }
273 }
274 
275 void autofs_kill_sb(struct super_block *);
276 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp