Commit | Line | Data |
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e9a7c2f1 IK |
1 | /* |
2 | * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved | |
3 | * Copyright 2005-2006 Ian Kent <raven@themaw.net> | |
1da177e4 LT |
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. | |
e9a7c2f1 | 8 | */ |
1da177e4 LT |
9 | |
10 | /* Internal header file for autofs */ | |
11 | ||
12 | #include <linux/auto_fs4.h> | |
8d7b48e0 | 13 | #include <linux/auto_dev-ioctl.h> |
1d5599e3 | 14 | #include <linux/mutex.h> |
b5c84bf6 | 15 | #include <linux/spinlock.h> |
1da177e4 LT |
16 | #include <linux/list.h> |
17 | ||
18 | /* This is the range of ioctl() numbers we claim as ours */ | |
19 | #define AUTOFS_IOC_FIRST AUTOFS_IOC_READY | |
20 | #define AUTOFS_IOC_COUNT 32 | |
21 | ||
8d7b48e0 IK |
22 | #define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION) |
23 | #define AUTOFS_DEV_IOCTL_IOC_COUNT (AUTOFS_IOC_COUNT - 11) | |
24 | ||
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/slab.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/wait.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/mount.h> | |
32 | #include <linux/namei.h> | |
33 | #include <asm/current.h> | |
e9a7c2f1 | 34 | #include <linux/uaccess.h> |
1da177e4 LT |
35 | |
36 | /* #define DEBUG */ | |
37 | ||
8a78d593 IK |
38 | #ifdef pr_fmt |
39 | #undef pr_fmt | |
40 | #endif | |
41 | #define pr_fmt(fmt) KBUILD_MODNAME ":pid:%d:%s: " fmt, current->pid, __func__ | |
8d7b48e0 | 42 | |
e9a7c2f1 IK |
43 | /* |
44 | * Unified info structure. This is pointed to by both the dentry and | |
45 | * inode structures. Each file in the filesystem has an instance of this | |
46 | * structure. It holds a reference to the dentry, so dentries are never | |
47 | * flushed while the file exists. All name lookups are dealt with at the | |
48 | * dentry level, although the filesystem can interfere in the validation | |
49 | * process. Readdir is implemented by traversing the dentry lists. | |
50 | */ | |
1da177e4 LT |
51 | struct autofs_info { |
52 | struct dentry *dentry; | |
53 | struct inode *inode; | |
54 | ||
55 | int flags; | |
56 | ||
6e60a9ab IK |
57 | struct completion expire_complete; |
58 | ||
25767378 | 59 | struct list_head active; |
4f8427d1 IK |
60 | int active_count; |
61 | ||
5f6f4f28 | 62 | struct list_head expiring; |
f50b6f86 | 63 | |
1da177e4 LT |
64 | struct autofs_sb_info *sbi; |
65 | unsigned long last_used; | |
1aff3c8b | 66 | atomic_t count; |
1da177e4 | 67 | |
45634cd8 EB |
68 | kuid_t uid; |
69 | kgid_t gid; | |
1da177e4 LT |
70 | }; |
71 | ||
e9a7c2f1 | 72 | #define AUTOFS_INF_EXPIRING (1<<0) /* dentry in the process of expiring */ |
ea01a184 | 73 | #define AUTOFS_INF_WANT_EXPIRE (1<<1) /* the dentry is being considered |
4d885f90 | 74 | * for expiry, so RCU_walk is |
ea01a184 AV |
75 | * not permitted. If it progresses to |
76 | * actual expiry attempt, the flag is | |
77 | * not cleared when EXPIRING is set - | |
78 | * in that case it gets cleared only | |
79 | * when it comes to clearing EXPIRING. | |
4d885f90 | 80 | */ |
aa952eb2 | 81 | #define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */ |
1da177e4 LT |
82 | |
83 | struct autofs_wait_queue { | |
84 | wait_queue_head_t queue; | |
85 | struct autofs_wait_queue *next; | |
86 | autofs_wqt_t wait_queue_token; | |
87 | /* We use the following to see what we are waiting for */ | |
70b52a0a | 88 | struct qstr name; |
5c0a32fc IK |
89 | u32 dev; |
90 | u64 ino; | |
45634cd8 EB |
91 | kuid_t uid; |
92 | kgid_t gid; | |
5c0a32fc IK |
93 | pid_t pid; |
94 | pid_t tgid; | |
1da177e4 LT |
95 | /* This is for status reporting upon return */ |
96 | int status; | |
296f7bf7 | 97 | unsigned int wait_ctr; |
1da177e4 LT |
98 | }; |
99 | ||
100 | #define AUTOFS_SBI_MAGIC 0x6d4a556d | |
101 | ||
102 | struct autofs_sb_info { | |
103 | u32 magic; | |
d7c4a5f1 | 104 | int pipefd; |
1da177e4 | 105 | struct file *pipe; |
6eaba35b | 106 | struct pid *oz_pgrp; |
1da177e4 LT |
107 | int catatonic; |
108 | int version; | |
109 | int sub_version; | |
d7c4a5f1 IK |
110 | int min_proto; |
111 | int max_proto; | |
1da177e4 | 112 | unsigned long exp_timeout; |
34ca959c | 113 | unsigned int type; |
1da177e4 LT |
114 | int reghost_enabled; |
115 | int needs_reghost; | |
116 | struct super_block *sb; | |
1d5599e3 | 117 | struct mutex wq_mutex; |
d668dc56 | 118 | struct mutex pipe_mutex; |
3a9720ce | 119 | spinlock_t fs_lock; |
1da177e4 | 120 | struct autofs_wait_queue *queues; /* Wait queue pointer */ |
5f6f4f28 | 121 | spinlock_t lookup_lock; |
25767378 | 122 | struct list_head active_list; |
5f6f4f28 | 123 | struct list_head expiring_list; |
baa40671 | 124 | struct rcu_head rcu; |
1da177e4 LT |
125 | }; |
126 | ||
127 | static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb) | |
128 | { | |
129 | return (struct autofs_sb_info *)(sb->s_fs_info); | |
130 | } | |
131 | ||
132 | static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry) | |
133 | { | |
134 | return (struct autofs_info *)(dentry->d_fsdata); | |
135 | } | |
136 | ||
137 | /* autofs4_oz_mode(): do we see the man behind the curtain? (The | |
e9a7c2f1 IK |
138 | * processes which do manipulations for us in user space sees the raw |
139 | * filesystem without "magic".) | |
140 | */ | |
141 | static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) | |
142 | { | |
6eaba35b | 143 | return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp; |
1da177e4 LT |
144 | } |
145 | ||
030a8ba4 | 146 | struct inode *autofs4_get_inode(struct super_block *, umode_t); |
1da177e4 LT |
147 | void autofs4_free_ino(struct autofs_info *); |
148 | ||
149 | /* Expiration */ | |
150 | int is_autofs4_dentry(struct dentry *); | |
23bfc2a2 | 151 | int autofs4_expire_wait(struct dentry *dentry, int rcu_walk); |
1da177e4 | 152 | int autofs4_expire_run(struct super_block *, struct vfsmount *, |
e9a7c2f1 IK |
153 | struct autofs_sb_info *, |
154 | struct autofs_packet_expire __user *); | |
56fcef75 IK |
155 | int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, |
156 | struct autofs_sb_info *sbi, int when); | |
1da177e4 | 157 | int autofs4_expire_multi(struct super_block *, struct vfsmount *, |
e9a7c2f1 | 158 | struct autofs_sb_info *, int __user *); |
8d7b48e0 IK |
159 | struct dentry *autofs4_expire_direct(struct super_block *sb, |
160 | struct vfsmount *mnt, | |
161 | struct autofs_sb_info *sbi, int how); | |
162 | struct dentry *autofs4_expire_indirect(struct super_block *sb, | |
163 | struct vfsmount *mnt, | |
164 | struct autofs_sb_info *sbi, int how); | |
165 | ||
166 | /* Device node initialization */ | |
167 | ||
168 | int autofs_dev_ioctl_init(void); | |
169 | void autofs_dev_ioctl_exit(void); | |
1da177e4 LT |
170 | |
171 | /* Operations structures */ | |
172 | ||
754661f1 AV |
173 | extern const struct inode_operations autofs4_symlink_inode_operations; |
174 | extern const struct inode_operations autofs4_dir_inode_operations; | |
4b6f5d20 AV |
175 | extern const struct file_operations autofs4_dir_operations; |
176 | extern const struct file_operations autofs4_root_operations; | |
71e469db | 177 | extern const struct dentry_operations autofs4_dentry_operations; |
10584211 IK |
178 | |
179 | /* VFS automount flags management functions */ | |
b5b80177 IK |
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 | ||
1da177e4 LT |
204 | /* Initializing function */ |
205 | ||
206 | int autofs4_fill_super(struct super_block *, void *, int); | |
26e6c910 AV |
207 | struct autofs_info *autofs4_new_ino(struct autofs_sb_info *); |
208 | void autofs4_clean_ino(struct autofs_info *); | |
1da177e4 | 209 | |
64f371bc LT |
210 | static inline int autofs_prepare_pipe(struct file *pipe) |
211 | { | |
a35fb914 | 212 | if (!(pipe->f_mode & FMODE_CAN_WRITE)) |
64f371bc | 213 | return -EINVAL; |
496ad9aa | 214 | if (!S_ISFIFO(file_inode(pipe)->i_mode)) |
64f371bc LT |
215 | return -EINVAL; |
216 | /* We want a packet pipe */ | |
217 | pipe->f_flags |= O_DIRECT; | |
218 | return 0; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | /* Queue management functions */ |
222 | ||
e9a7c2f1 IK |
223 | int autofs4_wait(struct autofs_sb_info *, struct dentry *, enum autofs_notify); |
224 | int autofs4_wait_release(struct autofs_sb_info *, autofs_wqt_t, int); | |
1da177e4 LT |
225 | void autofs4_catatonic_mode(struct autofs_sb_info *); |
226 | ||
5c0a32fc IK |
227 | static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi) |
228 | { | |
229 | return new_encode_dev(sbi->sb->s_dev); | |
230 | } | |
231 | ||
232 | static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi) | |
233 | { | |
2b0143b5 | 234 | return d_inode(sbi->sb->s_root)->i_ino; |
5c0a32fc IK |
235 | } |
236 | ||
2fd6b7f5 NP |
237 | static inline void __autofs4_add_expiring(struct dentry *dentry) |
238 | { | |
239 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
240 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
e9a7c2f1 | 241 | |
2fd6b7f5 NP |
242 | if (ino) { |
243 | if (list_empty(&ino->expiring)) | |
244 | list_add(&ino->expiring, &sbi->expiring_list); | |
245 | } | |
2fd6b7f5 NP |
246 | } |
247 | ||
c4cd70b3 IK |
248 | static inline void autofs4_add_expiring(struct dentry *dentry) |
249 | { | |
250 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
251 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
e9a7c2f1 | 252 | |
c4cd70b3 IK |
253 | if (ino) { |
254 | spin_lock(&sbi->lookup_lock); | |
255 | if (list_empty(&ino->expiring)) | |
256 | list_add(&ino->expiring, &sbi->expiring_list); | |
257 | spin_unlock(&sbi->lookup_lock); | |
258 | } | |
c4cd70b3 IK |
259 | } |
260 | ||
261 | static inline void autofs4_del_expiring(struct dentry *dentry) | |
262 | { | |
263 | struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); | |
264 | struct autofs_info *ino = autofs4_dentry_ino(dentry); | |
e9a7c2f1 | 265 | |
c4cd70b3 IK |
266 | if (ino) { |
267 | spin_lock(&sbi->lookup_lock); | |
268 | if (!list_empty(&ino->expiring)) | |
269 | list_del_init(&ino->expiring); | |
270 | spin_unlock(&sbi->lookup_lock); | |
271 | } | |
c4cd70b3 IK |
272 | } |
273 | ||
6ce31523 | 274 | extern void autofs4_kill_sb(struct super_block *); |