1 /* -*- linux-c -*- --------------------------------------------------------- *
3 * linux/fs/autofs/inode.c
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
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.
11 * ------------------------------------------------------------------------- */
13 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/file.h>
17 #include <linux/parser.h>
18 #include <linux/bitops.h>
19 #include <linux/magic.h>
21 #include <linux/module.h>
23 void autofs_kill_sb(struct super_block *sb)
25 struct autofs_sb_info *sbi = autofs_sbi(sb);
29 * In the event of a failure in get_sb_nodev the superblock
30 * info is not present so nothing else has been setup, so
31 * just call kill_anon_super when we are called from
38 autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
40 put_pid(sbi->oz_pgrp);
42 autofs_hash_nuke(sbi);
43 for (n = 0; n < AUTOFS_MAX_SYMLINKS; n++) {
44 if (test_bit(n, sbi->symlink_bitmap))
45 kfree(sbi->symlink[n].data);
51 DPRINTK(("autofs: shutting down\n"));
55 static const struct super_operations autofs_sops = {
56 .statfs = simple_statfs,
59 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
61 static match_table_t autofs_tokens = {
65 {Opt_pgrp, "pgrp=%u"},
66 {Opt_minproto, "minproto=%u"},
67 {Opt_maxproto, "maxproto=%u"},
71 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
72 pid_t *pgrp, int *minproto, int *maxproto)
75 substring_t args[MAX_OPT_ARGS];
80 *pgrp = task_pgrp_nr(current);
82 *minproto = *maxproto = AUTOFS_PROTO_VERSION;
89 while ((p = strsep(&options, ",")) != NULL) {
94 token = match_token(p, autofs_tokens, args);
97 if (match_int(&args[0], &option))
102 if (match_int(&args[0], &option))
107 if (match_int(&args[0], &option))
112 if (match_int(&args[0], &option))
117 if (match_int(&args[0], &option))
122 if (match_int(&args[0], &option))
130 return (*pipefd < 0);
133 int autofs_fill_super(struct super_block *s, void *data, int silent)
135 struct inode * root_inode;
136 struct dentry * root;
139 struct autofs_sb_info *sbi;
140 int minproto, maxproto;
143 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
146 DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
149 sbi->magic = AUTOFS_SBI_MAGIC;
152 sbi->exp_timeout = 0;
153 autofs_initialize_hash(&sbi->dirhash);
155 memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN);
156 sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO;
157 s->s_blocksize = 1024;
158 s->s_blocksize_bits = 10;
159 s->s_magic = AUTOFS_SUPER_MAGIC;
160 s->s_op = &autofs_sops;
164 root_inode = autofs_iget(s, AUTOFS_ROOT_INO);
165 if (IS_ERR(root_inode))
167 root = d_alloc_root(root_inode);
173 /* Can this call block? - WTF cares? s is locked. */
174 if (parse_options(data, &pipefd, &root_inode->i_uid,
175 &root_inode->i_gid, &pgid, &minproto,
177 printk("autofs: called with bogus options\n");
181 /* Couldn't this be tested earlier? */
182 if (minproto > AUTOFS_PROTO_VERSION ||
183 maxproto < AUTOFS_PROTO_VERSION) {
184 printk("autofs: kernel does not match daemon version\n");
188 DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, pgid));
189 sbi->oz_pgrp = find_get_pid(pgid);
192 printk("autofs: could not find process group %d\n", pgid);
199 printk("autofs: could not open pipe file descriptor\n");
203 if (!pipe->f_op || !pipe->f_op->write)
209 * Success! Install the root dentry now to indicate completion.
215 printk("autofs: pipe file descriptor does not contain proper ops\n");
218 put_pid(sbi->oz_pgrp);
223 printk("autofs: get root dentry failed\n");
232 struct inode *autofs_iget(struct super_block *sb, unsigned long ino)
235 struct autofs_sb_info *sbi = autofs_sbi(sb);
238 inode = iget_locked(sb, ino);
240 return ERR_PTR(-ENOMEM);
241 if (!(inode->i_state & I_NEW))
244 /* Initialize to the default case (stub directory) */
246 inode->i_op = &simple_dir_inode_operations;
247 inode->i_fop = &simple_dir_operations;
248 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
250 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
253 if (ino == AUTOFS_ROOT_INO) {
254 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
255 inode->i_op = &autofs_root_inode_operations;
256 inode->i_fop = &autofs_root_operations;
257 inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
261 inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
262 inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
264 if (ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO) {
265 /* Symlink inode - should be in symlink list */
266 struct autofs_symlink *sl;
268 n = ino - AUTOFS_FIRST_SYMLINK;
269 if (n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
270 printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
274 inode->i_op = &autofs_symlink_inode_operations;
275 sl = &sbi->symlink[n];
276 inode->i_private = sl;
277 inode->i_mode = S_IFLNK | S_IRWXUGO;
278 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec = sl->mtime;
279 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
280 inode->i_size = sl->len;
285 unlock_new_inode(inode);