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1da177e4 LT |
1 | /* -*- c -*- --------------------------------------------------------------- * |
2 | * | |
3 | * linux/fs/autofs/inode.c | |
4 | * | |
5 | * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved | |
6 | * | |
7 | * This file is part of the Linux kernel and is made available under | |
8 | * the terms of the GNU General Public License, version 2, or at your | |
9 | * option, any later version, incorporated herein by reference. | |
10 | * | |
11 | * ------------------------------------------------------------------------- */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/file.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/parser.h> | |
18 | #include <linux/bitops.h> | |
19 | #include "autofs_i.h" | |
20 | #include <linux/module.h> | |
21 | ||
22 | static void ino_lnkfree(struct autofs_info *ino) | |
23 | { | |
24 | if (ino->u.symlink) { | |
25 | kfree(ino->u.symlink); | |
26 | ino->u.symlink = NULL; | |
27 | } | |
28 | } | |
29 | ||
30 | struct autofs_info *autofs4_init_ino(struct autofs_info *ino, | |
31 | struct autofs_sb_info *sbi, mode_t mode) | |
32 | { | |
33 | int reinit = 1; | |
34 | ||
35 | if (ino == NULL) { | |
36 | reinit = 0; | |
37 | ino = kmalloc(sizeof(*ino), GFP_KERNEL); | |
38 | } | |
39 | ||
40 | if (ino == NULL) | |
41 | return NULL; | |
42 | ||
43 | ino->flags = 0; | |
44 | ino->mode = mode; | |
45 | ino->inode = NULL; | |
46 | ino->dentry = NULL; | |
47 | ino->size = 0; | |
48 | ||
49 | ino->last_used = jiffies; | |
50 | ||
51 | ino->sbi = sbi; | |
52 | ||
53 | if (reinit && ino->free) | |
54 | (ino->free)(ino); | |
55 | ||
56 | memset(&ino->u, 0, sizeof(ino->u)); | |
57 | ||
58 | ino->free = NULL; | |
59 | ||
60 | if (S_ISLNK(mode)) | |
61 | ino->free = ino_lnkfree; | |
62 | ||
63 | return ino; | |
64 | } | |
65 | ||
66 | void autofs4_free_ino(struct autofs_info *ino) | |
67 | { | |
68 | if (ino->dentry) { | |
69 | ino->dentry->d_fsdata = NULL; | |
70 | if (ino->dentry->d_inode) | |
71 | dput(ino->dentry); | |
72 | ino->dentry = NULL; | |
73 | } | |
74 | if (ino->free) | |
75 | (ino->free)(ino); | |
76 | kfree(ino); | |
77 | } | |
78 | ||
79 | static void autofs4_put_super(struct super_block *sb) | |
80 | { | |
81 | struct autofs_sb_info *sbi = autofs4_sbi(sb); | |
82 | ||
83 | sb->s_fs_info = NULL; | |
84 | ||
85 | if ( !sbi->catatonic ) | |
86 | autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */ | |
87 | ||
88 | kfree(sbi); | |
89 | ||
90 | DPRINTK("shutting down"); | |
91 | } | |
92 | ||
93 | static struct super_operations autofs4_sops = { | |
94 | .put_super = autofs4_put_super, | |
95 | .statfs = simple_statfs, | |
96 | }; | |
97 | ||
98 | enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto}; | |
99 | ||
100 | static match_table_t tokens = { | |
101 | {Opt_fd, "fd=%u"}, | |
102 | {Opt_uid, "uid=%u"}, | |
103 | {Opt_gid, "gid=%u"}, | |
104 | {Opt_pgrp, "pgrp=%u"}, | |
105 | {Opt_minproto, "minproto=%u"}, | |
106 | {Opt_maxproto, "maxproto=%u"}, | |
107 | {Opt_err, NULL} | |
108 | }; | |
109 | ||
110 | static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, | |
111 | pid_t *pgrp, int *minproto, int *maxproto) | |
112 | { | |
113 | char *p; | |
114 | substring_t args[MAX_OPT_ARGS]; | |
115 | int option; | |
116 | ||
117 | *uid = current->uid; | |
118 | *gid = current->gid; | |
119 | *pgrp = process_group(current); | |
120 | ||
121 | *minproto = AUTOFS_MIN_PROTO_VERSION; | |
122 | *maxproto = AUTOFS_MAX_PROTO_VERSION; | |
123 | ||
124 | *pipefd = -1; | |
125 | ||
126 | if (!options) | |
127 | return 1; | |
128 | ||
129 | while ((p = strsep(&options, ",")) != NULL) { | |
130 | int token; | |
131 | if (!*p) | |
132 | continue; | |
133 | ||
134 | token = match_token(p, tokens, args); | |
135 | switch (token) { | |
136 | case Opt_fd: | |
137 | if (match_int(args, pipefd)) | |
138 | return 1; | |
139 | break; | |
140 | case Opt_uid: | |
141 | if (match_int(args, &option)) | |
142 | return 1; | |
143 | *uid = option; | |
144 | break; | |
145 | case Opt_gid: | |
146 | if (match_int(args, &option)) | |
147 | return 1; | |
148 | *gid = option; | |
149 | break; | |
150 | case Opt_pgrp: | |
151 | if (match_int(args, &option)) | |
152 | return 1; | |
153 | *pgrp = option; | |
154 | break; | |
155 | case Opt_minproto: | |
156 | if (match_int(args, &option)) | |
157 | return 1; | |
158 | *minproto = option; | |
159 | break; | |
160 | case Opt_maxproto: | |
161 | if (match_int(args, &option)) | |
162 | return 1; | |
163 | *maxproto = option; | |
164 | break; | |
165 | default: | |
166 | return 1; | |
167 | } | |
168 | } | |
169 | return (*pipefd < 0); | |
170 | } | |
171 | ||
172 | static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi) | |
173 | { | |
174 | struct autofs_info *ino; | |
175 | ||
176 | ino = autofs4_init_ino(NULL, sbi, S_IFDIR | 0755); | |
177 | if (!ino) | |
178 | return NULL; | |
179 | ||
180 | return ino; | |
181 | } | |
182 | ||
183 | int autofs4_fill_super(struct super_block *s, void *data, int silent) | |
184 | { | |
185 | struct inode * root_inode; | |
186 | struct dentry * root; | |
187 | struct file * pipe; | |
188 | int pipefd; | |
189 | struct autofs_sb_info *sbi; | |
190 | struct autofs_info *ino; | |
191 | int minproto, maxproto; | |
192 | ||
193 | sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL); | |
194 | if ( !sbi ) | |
195 | goto fail_unlock; | |
196 | DPRINTK("starting up, sbi = %p",sbi); | |
197 | ||
198 | memset(sbi, 0, sizeof(*sbi)); | |
199 | ||
200 | s->s_fs_info = sbi; | |
201 | sbi->magic = AUTOFS_SBI_MAGIC; | |
202 | sbi->catatonic = 0; | |
203 | sbi->exp_timeout = 0; | |
204 | sbi->oz_pgrp = process_group(current); | |
205 | sbi->sb = s; | |
206 | sbi->version = 0; | |
207 | sbi->sub_version = 0; | |
208 | init_MUTEX(&sbi->wq_sem); | |
209 | sbi->queues = NULL; | |
210 | s->s_blocksize = 1024; | |
211 | s->s_blocksize_bits = 10; | |
212 | s->s_magic = AUTOFS_SUPER_MAGIC; | |
213 | s->s_op = &autofs4_sops; | |
214 | s->s_time_gran = 1; | |
215 | ||
216 | /* | |
217 | * Get the root inode and dentry, but defer checking for errors. | |
218 | */ | |
219 | ino = autofs4_mkroot(sbi); | |
220 | if (!ino) | |
221 | goto fail_free; | |
222 | root_inode = autofs4_get_inode(s, ino); | |
223 | kfree(ino); | |
224 | if (!root_inode) | |
225 | goto fail_free; | |
226 | ||
227 | root_inode->i_op = &autofs4_root_inode_operations; | |
228 | root_inode->i_fop = &autofs4_root_operations; | |
229 | root = d_alloc_root(root_inode); | |
230 | pipe = NULL; | |
231 | ||
232 | if (!root) | |
233 | goto fail_iput; | |
234 | ||
235 | /* Can this call block? */ | |
236 | if (parse_options(data, &pipefd, | |
237 | &root_inode->i_uid, &root_inode->i_gid, | |
238 | &sbi->oz_pgrp, | |
239 | &minproto, &maxproto)) { | |
240 | printk("autofs: called with bogus options\n"); | |
241 | goto fail_dput; | |
242 | } | |
243 | ||
244 | /* Couldn't this be tested earlier? */ | |
245 | if (maxproto < AUTOFS_MIN_PROTO_VERSION || | |
246 | minproto > AUTOFS_MAX_PROTO_VERSION) { | |
247 | printk("autofs: kernel does not match daemon version " | |
248 | "daemon (%d, %d) kernel (%d, %d)\n", | |
249 | minproto, maxproto, | |
250 | AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION); | |
251 | goto fail_dput; | |
252 | } | |
253 | ||
254 | sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto; | |
255 | sbi->sub_version = AUTOFS_PROTO_SUBVERSION; | |
256 | ||
257 | DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp); | |
258 | pipe = fget(pipefd); | |
259 | ||
260 | if ( !pipe ) { | |
261 | printk("autofs: could not open pipe file descriptor\n"); | |
262 | goto fail_dput; | |
263 | } | |
264 | if ( !pipe->f_op || !pipe->f_op->write ) | |
265 | goto fail_fput; | |
266 | sbi->pipe = pipe; | |
267 | ||
268 | /* | |
269 | * Success! Install the root dentry now to indicate completion. | |
270 | */ | |
271 | s->s_root = root; | |
272 | return 0; | |
273 | ||
274 | /* | |
275 | * Failure ... clean up. | |
276 | */ | |
277 | fail_fput: | |
278 | printk("autofs: pipe file descriptor does not contain proper ops\n"); | |
279 | fput(pipe); | |
280 | /* fall through */ | |
281 | fail_dput: | |
282 | dput(root); | |
283 | goto fail_free; | |
284 | fail_iput: | |
285 | printk("autofs: get root dentry failed\n"); | |
286 | iput(root_inode); | |
287 | fail_free: | |
288 | kfree(sbi); | |
289 | fail_unlock: | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | struct inode *autofs4_get_inode(struct super_block *sb, | |
294 | struct autofs_info *inf) | |
295 | { | |
296 | struct inode *inode = new_inode(sb); | |
297 | ||
298 | if (inode == NULL) | |
299 | return NULL; | |
300 | ||
301 | inf->inode = inode; | |
302 | inode->i_mode = inf->mode; | |
303 | if (sb->s_root) { | |
304 | inode->i_uid = sb->s_root->d_inode->i_uid; | |
305 | inode->i_gid = sb->s_root->d_inode->i_gid; | |
306 | } else { | |
307 | inode->i_uid = 0; | |
308 | inode->i_gid = 0; | |
309 | } | |
310 | inode->i_blksize = PAGE_CACHE_SIZE; | |
311 | inode->i_blocks = 0; | |
312 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
313 | ||
314 | if (S_ISDIR(inf->mode)) { | |
315 | inode->i_nlink = 2; | |
316 | inode->i_op = &autofs4_dir_inode_operations; | |
317 | inode->i_fop = &autofs4_dir_operations; | |
318 | } else if (S_ISLNK(inf->mode)) { | |
319 | inode->i_size = inf->size; | |
320 | inode->i_op = &autofs4_symlink_inode_operations; | |
321 | } | |
322 | ||
323 | return inode; | |
324 | } |