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ebc921ca IK |
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 | ||
ebc921ca IK |
10 | #include <linux/seq_file.h> |
11 | #include <linux/pagemap.h> | |
12 | #include <linux/parser.h> | |
6471e938 | 13 | |
ebc921ca | 14 | #include "autofs_i.h" |
ebc921ca IK |
15 | |
16 | struct autofs_info *autofs_new_ino(struct autofs_sb_info *sbi) | |
17 | { | |
18 | struct autofs_info *ino; | |
19 | ||
20 | ino = kzalloc(sizeof(*ino), GFP_KERNEL); | |
21 | if (ino) { | |
22 | INIT_LIST_HEAD(&ino->active); | |
23 | INIT_LIST_HEAD(&ino->expiring); | |
24 | ino->last_used = jiffies; | |
25 | ino->sbi = sbi; | |
26 | } | |
27 | return ino; | |
28 | } | |
29 | ||
30 | void autofs_clean_ino(struct autofs_info *ino) | |
31 | { | |
32 | ino->uid = GLOBAL_ROOT_UID; | |
33 | ino->gid = GLOBAL_ROOT_GID; | |
34 | ino->last_used = jiffies; | |
35 | } | |
36 | ||
37 | void autofs_free_ino(struct autofs_info *ino) | |
38 | { | |
39 | kfree(ino); | |
40 | } | |
41 | ||
42 | void autofs_kill_sb(struct super_block *sb) | |
43 | { | |
44 | struct autofs_sb_info *sbi = autofs_sbi(sb); | |
45 | ||
46 | /* | |
47 | * In the event of a failure in get_sb_nodev the superblock | |
48 | * info is not present so nothing else has been setup, so | |
49 | * just call kill_anon_super when we are called from | |
50 | * deactivate_super. | |
51 | */ | |
52 | if (sbi) { | |
53 | /* Free wait queues, close pipe */ | |
54 | autofs_catatonic_mode(sbi); | |
55 | put_pid(sbi->oz_pgrp); | |
56 | } | |
57 | ||
58 | pr_debug("shutting down\n"); | |
59 | kill_litter_super(sb); | |
60 | if (sbi) | |
61 | kfree_rcu(sbi, rcu); | |
62 | } | |
63 | ||
64 | static int autofs_show_options(struct seq_file *m, struct dentry *root) | |
65 | { | |
66 | struct autofs_sb_info *sbi = autofs_sbi(root->d_sb); | |
67 | struct inode *root_inode = d_inode(root->d_sb->s_root); | |
68 | ||
69 | if (!sbi) | |
70 | return 0; | |
71 | ||
72 | seq_printf(m, ",fd=%d", sbi->pipefd); | |
73 | if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID)) | |
74 | seq_printf(m, ",uid=%u", | |
75 | from_kuid_munged(&init_user_ns, root_inode->i_uid)); | |
76 | if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID)) | |
77 | seq_printf(m, ",gid=%u", | |
78 | from_kgid_munged(&init_user_ns, root_inode->i_gid)); | |
79 | seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp)); | |
80 | seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ); | |
81 | seq_printf(m, ",minproto=%d", sbi->min_proto); | |
82 | seq_printf(m, ",maxproto=%d", sbi->max_proto); | |
83 | ||
84 | if (autofs_type_offset(sbi->type)) | |
85 | seq_printf(m, ",offset"); | |
86 | else if (autofs_type_direct(sbi->type)) | |
87 | seq_printf(m, ",direct"); | |
88 | else | |
89 | seq_printf(m, ",indirect"); | |
90 | #ifdef CONFIG_CHECKPOINT_RESTORE | |
91 | if (sbi->pipe) | |
92 | seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino); | |
93 | else | |
94 | seq_printf(m, ",pipe_ino=-1"); | |
95 | #endif | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static void autofs_evict_inode(struct inode *inode) | |
100 | { | |
101 | clear_inode(inode); | |
102 | kfree(inode->i_private); | |
103 | } | |
104 | ||
105 | static const struct super_operations autofs_sops = { | |
106 | .statfs = simple_statfs, | |
107 | .show_options = autofs_show_options, | |
108 | .evict_inode = autofs_evict_inode, | |
109 | }; | |
110 | ||
111 | enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto, | |
112 | Opt_indirect, Opt_direct, Opt_offset}; | |
113 | ||
114 | static const match_table_t tokens = { | |
115 | {Opt_fd, "fd=%u"}, | |
116 | {Opt_uid, "uid=%u"}, | |
117 | {Opt_gid, "gid=%u"}, | |
118 | {Opt_pgrp, "pgrp=%u"}, | |
119 | {Opt_minproto, "minproto=%u"}, | |
120 | {Opt_maxproto, "maxproto=%u"}, | |
121 | {Opt_indirect, "indirect"}, | |
122 | {Opt_direct, "direct"}, | |
123 | {Opt_offset, "offset"}, | |
124 | {Opt_err, NULL} | |
125 | }; | |
126 | ||
9bf964c9 IK |
127 | static int parse_options(char *options, |
128 | struct inode *root, int *pgrp, bool *pgrp_set, | |
129 | struct autofs_sb_info *sbi) | |
ebc921ca IK |
130 | { |
131 | char *p; | |
132 | substring_t args[MAX_OPT_ARGS]; | |
133 | int option; | |
9bf964c9 IK |
134 | int pipefd = -1; |
135 | kuid_t uid; | |
136 | kgid_t gid; | |
ebc921ca | 137 | |
9bf964c9 IK |
138 | root->i_uid = current_uid(); |
139 | root->i_gid = current_gid(); | |
ebc921ca | 140 | |
9bf964c9 IK |
141 | sbi->min_proto = AUTOFS_MIN_PROTO_VERSION; |
142 | sbi->max_proto = AUTOFS_MAX_PROTO_VERSION; | |
ebc921ca | 143 | |
9bf964c9 | 144 | sbi->pipefd = -1; |
ebc921ca IK |
145 | |
146 | if (!options) | |
147 | return 1; | |
148 | ||
149 | while ((p = strsep(&options, ",")) != NULL) { | |
150 | int token; | |
151 | ||
152 | if (!*p) | |
153 | continue; | |
154 | ||
155 | token = match_token(p, tokens, args); | |
156 | switch (token) { | |
157 | case Opt_fd: | |
9bf964c9 | 158 | if (match_int(args, &pipefd)) |
ebc921ca | 159 | return 1; |
9bf964c9 | 160 | sbi->pipefd = pipefd; |
ebc921ca IK |
161 | break; |
162 | case Opt_uid: | |
163 | if (match_int(args, &option)) | |
164 | return 1; | |
9bf964c9 IK |
165 | uid = make_kuid(current_user_ns(), option); |
166 | if (!uid_valid(uid)) | |
ebc921ca | 167 | return 1; |
9bf964c9 | 168 | root->i_uid = uid; |
ebc921ca IK |
169 | break; |
170 | case Opt_gid: | |
171 | if (match_int(args, &option)) | |
172 | return 1; | |
9bf964c9 IK |
173 | gid = make_kgid(current_user_ns(), option); |
174 | if (!gid_valid(gid)) | |
ebc921ca | 175 | return 1; |
9bf964c9 | 176 | root->i_gid = gid; |
ebc921ca IK |
177 | break; |
178 | case Opt_pgrp: | |
179 | if (match_int(args, &option)) | |
180 | return 1; | |
181 | *pgrp = option; | |
182 | *pgrp_set = true; | |
183 | break; | |
184 | case Opt_minproto: | |
185 | if (match_int(args, &option)) | |
186 | return 1; | |
9bf964c9 | 187 | sbi->min_proto = option; |
ebc921ca IK |
188 | break; |
189 | case Opt_maxproto: | |
190 | if (match_int(args, &option)) | |
191 | return 1; | |
9bf964c9 | 192 | sbi->max_proto = option; |
ebc921ca IK |
193 | break; |
194 | case Opt_indirect: | |
9bf964c9 | 195 | set_autofs_type_indirect(&sbi->type); |
ebc921ca IK |
196 | break; |
197 | case Opt_direct: | |
9bf964c9 | 198 | set_autofs_type_direct(&sbi->type); |
ebc921ca IK |
199 | break; |
200 | case Opt_offset: | |
9bf964c9 | 201 | set_autofs_type_offset(&sbi->type); |
ebc921ca IK |
202 | break; |
203 | default: | |
204 | return 1; | |
205 | } | |
206 | } | |
9bf964c9 | 207 | return (sbi->pipefd < 0); |
ebc921ca IK |
208 | } |
209 | ||
210 | int autofs_fill_super(struct super_block *s, void *data, int silent) | |
211 | { | |
212 | struct inode *root_inode; | |
213 | struct dentry *root; | |
214 | struct file *pipe; | |
ebc921ca IK |
215 | struct autofs_sb_info *sbi; |
216 | struct autofs_info *ino; | |
217 | int pgrp = 0; | |
218 | bool pgrp_set = false; | |
219 | int ret = -EINVAL; | |
220 | ||
221 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
222 | if (!sbi) | |
223 | return -ENOMEM; | |
224 | pr_debug("starting up, sbi = %p\n", sbi); | |
225 | ||
226 | s->s_fs_info = sbi; | |
227 | sbi->magic = AUTOFS_SBI_MAGIC; | |
228 | sbi->pipefd = -1; | |
229 | sbi->pipe = NULL; | |
230 | sbi->catatonic = 1; | |
231 | sbi->exp_timeout = 0; | |
232 | sbi->oz_pgrp = NULL; | |
233 | sbi->sb = s; | |
234 | sbi->version = 0; | |
235 | sbi->sub_version = 0; | |
236 | set_autofs_type_indirect(&sbi->type); | |
237 | sbi->min_proto = 0; | |
238 | sbi->max_proto = 0; | |
239 | mutex_init(&sbi->wq_mutex); | |
240 | mutex_init(&sbi->pipe_mutex); | |
241 | spin_lock_init(&sbi->fs_lock); | |
242 | sbi->queues = NULL; | |
243 | spin_lock_init(&sbi->lookup_lock); | |
244 | INIT_LIST_HEAD(&sbi->active_list); | |
245 | INIT_LIST_HEAD(&sbi->expiring_list); | |
246 | s->s_blocksize = 1024; | |
247 | s->s_blocksize_bits = 10; | |
248 | s->s_magic = AUTOFS_SUPER_MAGIC; | |
249 | s->s_op = &autofs_sops; | |
250 | s->s_d_op = &autofs_dentry_operations; | |
251 | s->s_time_gran = 1; | |
252 | ||
253 | /* | |
254 | * Get the root inode and dentry, but defer checking for errors. | |
255 | */ | |
256 | ino = autofs_new_ino(sbi); | |
257 | if (!ino) { | |
258 | ret = -ENOMEM; | |
259 | goto fail_free; | |
260 | } | |
261 | root_inode = autofs_get_inode(s, S_IFDIR | 0755); | |
262 | root = d_make_root(root_inode); | |
263 | if (!root) | |
264 | goto fail_ino; | |
265 | pipe = NULL; | |
266 | ||
267 | root->d_fsdata = ino; | |
268 | ||
269 | /* Can this call block? */ | |
9bf964c9 | 270 | if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) { |
ebc921ca IK |
271 | pr_err("called with bogus options\n"); |
272 | goto fail_dput; | |
273 | } | |
274 | ||
275 | /* Test versions first */ | |
276 | if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION || | |
277 | sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) { | |
278 | pr_err("kernel does not match daemon version " | |
279 | "daemon (%d, %d) kernel (%d, %d)\n", | |
280 | sbi->min_proto, sbi->max_proto, | |
281 | AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION); | |
282 | goto fail_dput; | |
283 | } | |
284 | ||
285 | /* Establish highest kernel protocol version */ | |
286 | if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION) | |
287 | sbi->version = AUTOFS_MAX_PROTO_VERSION; | |
288 | else | |
289 | sbi->version = sbi->max_proto; | |
290 | sbi->sub_version = AUTOFS_PROTO_SUBVERSION; | |
291 | ||
292 | if (pgrp_set) { | |
293 | sbi->oz_pgrp = find_get_pid(pgrp); | |
294 | if (!sbi->oz_pgrp) { | |
295 | pr_err("could not find process group %d\n", | |
296 | pgrp); | |
297 | goto fail_dput; | |
298 | } | |
299 | } else { | |
300 | sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID); | |
301 | } | |
302 | ||
303 | if (autofs_type_trigger(sbi->type)) | |
304 | __managed_dentry_set_managed(root); | |
305 | ||
306 | root_inode->i_fop = &autofs_root_operations; | |
307 | root_inode->i_op = &autofs_dir_inode_operations; | |
308 | ||
9bf964c9 IK |
309 | pr_debug("pipe fd = %d, pgrp = %u\n", |
310 | sbi->pipefd, pid_nr(sbi->oz_pgrp)); | |
311 | pipe = fget(sbi->pipefd); | |
ebc921ca IK |
312 | |
313 | if (!pipe) { | |
314 | pr_err("could not open pipe file descriptor\n"); | |
315 | goto fail_put_pid; | |
316 | } | |
317 | ret = autofs_prepare_pipe(pipe); | |
318 | if (ret < 0) | |
319 | goto fail_fput; | |
320 | sbi->pipe = pipe; | |
ebc921ca IK |
321 | sbi->catatonic = 0; |
322 | ||
323 | /* | |
324 | * Success! Install the root dentry now to indicate completion. | |
325 | */ | |
326 | s->s_root = root; | |
327 | return 0; | |
328 | ||
329 | /* | |
330 | * Failure ... clean up. | |
331 | */ | |
332 | fail_fput: | |
333 | pr_err("pipe file descriptor does not contain proper ops\n"); | |
334 | fput(pipe); | |
335 | fail_put_pid: | |
336 | put_pid(sbi->oz_pgrp); | |
337 | fail_dput: | |
338 | dput(root); | |
339 | goto fail_free; | |
340 | fail_ino: | |
341 | autofs_free_ino(ino); | |
342 | fail_free: | |
343 | kfree(sbi); | |
344 | s->s_fs_info = NULL; | |
345 | return ret; | |
346 | } | |
347 | ||
348 | struct inode *autofs_get_inode(struct super_block *sb, umode_t mode) | |
349 | { | |
350 | struct inode *inode = new_inode(sb); | |
351 | ||
352 | if (inode == NULL) | |
353 | return NULL; | |
354 | ||
355 | inode->i_mode = mode; | |
356 | if (sb->s_root) { | |
357 | inode->i_uid = d_inode(sb->s_root)->i_uid; | |
358 | inode->i_gid = d_inode(sb->s_root)->i_gid; | |
359 | } | |
360 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); | |
361 | inode->i_ino = get_next_ino(); | |
362 | ||
363 | if (S_ISDIR(mode)) { | |
364 | set_nlink(inode, 2); | |
365 | inode->i_op = &autofs_dir_inode_operations; | |
366 | inode->i_fop = &autofs_dir_operations; | |
367 | } else if (S_ISLNK(mode)) { | |
368 | inode->i_op = &autofs_symlink_inode_operations; | |
369 | } else | |
370 | WARN_ON(1); | |
371 | ||
372 | return inode; | |
373 | } |