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1 | /* -*- linux-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/mm.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/file.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 autofs_put_super(struct super_block *sb) | |
23 | { | |
24 | struct autofs_sb_info *sbi = autofs_sbi(sb); | |
25 | unsigned int n; | |
26 | ||
27 | if ( !sbi->catatonic ) | |
28 | autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */ | |
29 | ||
30 | autofs_hash_nuke(&sbi->dirhash); | |
31 | for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) { | |
32 | if ( test_bit(n, sbi->symlink_bitmap) ) | |
33 | kfree(sbi->symlink[n].data); | |
34 | } | |
35 | ||
36 | kfree(sb->s_fs_info); | |
37 | ||
38 | DPRINTK(("autofs: shutting down\n")); | |
39 | } | |
40 | ||
41 | static void autofs_read_inode(struct inode *inode); | |
42 | ||
43 | static struct super_operations autofs_sops = { | |
44 | .read_inode = autofs_read_inode, | |
45 | .put_super = autofs_put_super, | |
46 | .statfs = simple_statfs, | |
47 | }; | |
48 | ||
49 | enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto}; | |
50 | ||
51 | static match_table_t autofs_tokens = { | |
52 | {Opt_fd, "fd=%u"}, | |
53 | {Opt_uid, "uid=%u"}, | |
54 | {Opt_gid, "gid=%u"}, | |
55 | {Opt_pgrp, "pgrp=%u"}, | |
56 | {Opt_minproto, "minproto=%u"}, | |
57 | {Opt_maxproto, "maxproto=%u"}, | |
58 | {Opt_err, NULL} | |
59 | }; | |
60 | ||
61 | static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto) | |
62 | { | |
63 | char *p; | |
64 | substring_t args[MAX_OPT_ARGS]; | |
65 | int option; | |
66 | ||
67 | *uid = current->uid; | |
68 | *gid = current->gid; | |
69 | *pgrp = process_group(current); | |
70 | ||
71 | *minproto = *maxproto = AUTOFS_PROTO_VERSION; | |
72 | ||
73 | *pipefd = -1; | |
74 | ||
75 | if (!options) | |
76 | return 1; | |
77 | ||
78 | while ((p = strsep(&options, ",")) != NULL) { | |
79 | int token; | |
80 | if (!*p) | |
81 | continue; | |
82 | ||
83 | token = match_token(p, autofs_tokens, args); | |
84 | switch (token) { | |
85 | case Opt_fd: | |
86 | if (match_int(&args[0], &option)) | |
87 | return 1; | |
88 | *pipefd = option; | |
89 | break; | |
90 | case Opt_uid: | |
91 | if (match_int(&args[0], &option)) | |
92 | return 1; | |
93 | *uid = option; | |
94 | break; | |
95 | case Opt_gid: | |
96 | if (match_int(&args[0], &option)) | |
97 | return 1; | |
98 | *gid = option; | |
99 | break; | |
100 | case Opt_pgrp: | |
101 | if (match_int(&args[0], &option)) | |
102 | return 1; | |
103 | *pgrp = option; | |
104 | break; | |
105 | case Opt_minproto: | |
106 | if (match_int(&args[0], &option)) | |
107 | return 1; | |
108 | *minproto = option; | |
109 | break; | |
110 | case Opt_maxproto: | |
111 | if (match_int(&args[0], &option)) | |
112 | return 1; | |
113 | *maxproto = option; | |
114 | break; | |
115 | default: | |
116 | return 1; | |
117 | } | |
118 | } | |
119 | return (*pipefd < 0); | |
120 | } | |
121 | ||
122 | int autofs_fill_super(struct super_block *s, void *data, int silent) | |
123 | { | |
124 | struct inode * root_inode; | |
125 | struct dentry * root; | |
126 | struct file * pipe; | |
127 | int pipefd; | |
128 | struct autofs_sb_info *sbi; | |
129 | int minproto, maxproto; | |
130 | ||
131 | sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); | |
132 | if ( !sbi ) | |
133 | goto fail_unlock; | |
134 | memset(sbi, 0, sizeof(*sbi)); | |
135 | DPRINTK(("autofs: starting up, sbi = %p\n",sbi)); | |
136 | ||
137 | s->s_fs_info = sbi; | |
138 | sbi->magic = AUTOFS_SBI_MAGIC; | |
139 | sbi->catatonic = 0; | |
140 | sbi->exp_timeout = 0; | |
141 | sbi->oz_pgrp = process_group(current); | |
142 | autofs_initialize_hash(&sbi->dirhash); | |
143 | sbi->queues = NULL; | |
144 | memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN); | |
145 | sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO; | |
146 | s->s_blocksize = 1024; | |
147 | s->s_blocksize_bits = 10; | |
148 | s->s_magic = AUTOFS_SUPER_MAGIC; | |
149 | s->s_op = &autofs_sops; | |
150 | s->s_time_gran = 1; | |
151 | ||
152 | root_inode = iget(s, AUTOFS_ROOT_INO); | |
153 | root = d_alloc_root(root_inode); | |
154 | pipe = NULL; | |
155 | ||
156 | if (!root) | |
157 | goto fail_iput; | |
158 | ||
159 | /* Can this call block? - WTF cares? s is locked. */ | |
160 | if ( parse_options(data,&pipefd,&root_inode->i_uid,&root_inode->i_gid,&sbi->oz_pgrp,&minproto,&maxproto) ) { | |
161 | printk("autofs: called with bogus options\n"); | |
162 | goto fail_dput; | |
163 | } | |
164 | ||
165 | /* Couldn't this be tested earlier? */ | |
166 | if ( minproto > AUTOFS_PROTO_VERSION || | |
167 | maxproto < AUTOFS_PROTO_VERSION ) { | |
168 | printk("autofs: kernel does not match daemon version\n"); | |
169 | goto fail_dput; | |
170 | } | |
171 | ||
172 | DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp)); | |
173 | pipe = fget(pipefd); | |
174 | ||
175 | if ( !pipe ) { | |
176 | printk("autofs: could not open pipe file descriptor\n"); | |
177 | goto fail_dput; | |
178 | } | |
179 | if ( !pipe->f_op || !pipe->f_op->write ) | |
180 | goto fail_fput; | |
181 | sbi->pipe = pipe; | |
182 | ||
183 | /* | |
184 | * Success! Install the root dentry now to indicate completion. | |
185 | */ | |
186 | s->s_root = root; | |
187 | return 0; | |
188 | ||
189 | fail_fput: | |
190 | printk("autofs: pipe file descriptor does not contain proper ops\n"); | |
191 | fput(pipe); | |
192 | fail_dput: | |
193 | dput(root); | |
194 | goto fail_free; | |
195 | fail_iput: | |
196 | printk("autofs: get root dentry failed\n"); | |
197 | iput(root_inode); | |
198 | fail_free: | |
199 | kfree(sbi); | |
200 | fail_unlock: | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | static void autofs_read_inode(struct inode *inode) | |
205 | { | |
206 | ino_t ino = inode->i_ino; | |
207 | unsigned int n; | |
208 | struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb); | |
209 | ||
210 | /* Initialize to the default case (stub directory) */ | |
211 | ||
212 | inode->i_op = &simple_dir_inode_operations; | |
213 | inode->i_fop = &simple_dir_operations; | |
214 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
215 | inode->i_nlink = 2; | |
216 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
217 | inode->i_blocks = 0; | |
218 | inode->i_blksize = 1024; | |
219 | ||
220 | if ( ino == AUTOFS_ROOT_INO ) { | |
221 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR; | |
222 | inode->i_op = &autofs_root_inode_operations; | |
223 | inode->i_fop = &autofs_root_operations; | |
224 | inode->i_uid = inode->i_gid = 0; /* Changed in read_super */ | |
225 | return; | |
226 | } | |
227 | ||
228 | inode->i_uid = inode->i_sb->s_root->d_inode->i_uid; | |
229 | inode->i_gid = inode->i_sb->s_root->d_inode->i_gid; | |
230 | ||
231 | if ( ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO ) { | |
232 | /* Symlink inode - should be in symlink list */ | |
233 | struct autofs_symlink *sl; | |
234 | ||
235 | n = ino - AUTOFS_FIRST_SYMLINK; | |
236 | if ( n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) { | |
237 | printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino); | |
238 | return; | |
239 | } | |
240 | ||
241 | inode->i_op = &autofs_symlink_inode_operations; | |
242 | sl = &sbi->symlink[n]; | |
243 | inode->u.generic_ip = sl; | |
244 | inode->i_mode = S_IFLNK | S_IRWXUGO; | |
245 | inode->i_mtime.tv_sec = inode->i_ctime.tv_sec = sl->mtime; | |
246 | inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0; | |
247 | inode->i_size = sl->len; | |
248 | inode->i_nlink = 1; | |
249 | } | |
250 | } |