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 exit when we are called from deactivate_super.
36 if ( !sbi->catatonic )
37 autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
39 autofs_hash_nuke(sbi);
40 for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) {
41 if ( test_bit(n, sbi->symlink_bitmap) )
42 kfree(sbi->symlink[n].data);
47 DPRINTK(("autofs: shutting down\n"));
51 static void autofs_read_inode(struct inode *inode);
53 static struct super_operations autofs_sops = {
54 .read_inode = autofs_read_inode,
55 .statfs = simple_statfs,
58 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
60 static match_table_t autofs_tokens = {
64 {Opt_pgrp, "pgrp=%u"},
65 {Opt_minproto, "minproto=%u"},
66 {Opt_maxproto, "maxproto=%u"},
70 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto)
73 substring_t args[MAX_OPT_ARGS];
78 *pgrp = process_group(current);
80 *minproto = *maxproto = AUTOFS_PROTO_VERSION;
87 while ((p = strsep(&options, ",")) != NULL) {
92 token = match_token(p, autofs_tokens, args);
95 if (match_int(&args[0], &option))
100 if (match_int(&args[0], &option))
105 if (match_int(&args[0], &option))
110 if (match_int(&args[0], &option))
115 if (match_int(&args[0], &option))
120 if (match_int(&args[0], &option))
128 return (*pipefd < 0);
131 int autofs_fill_super(struct super_block *s, void *data, int silent)
133 struct inode * root_inode;
134 struct dentry * root;
137 struct autofs_sb_info *sbi;
138 int minproto, maxproto;
140 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
143 DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
146 sbi->magic = AUTOFS_SBI_MAGIC;
149 sbi->exp_timeout = 0;
150 sbi->oz_pgrp = process_group(current);
151 autofs_initialize_hash(&sbi->dirhash);
153 memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN);
154 sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO;
155 s->s_blocksize = 1024;
156 s->s_blocksize_bits = 10;
157 s->s_magic = AUTOFS_SUPER_MAGIC;
158 s->s_op = &autofs_sops;
162 root_inode = iget(s, AUTOFS_ROOT_INO);
163 root = d_alloc_root(root_inode);
169 /* Can this call block? - WTF cares? s is locked. */
170 if ( parse_options(data,&pipefd,&root_inode->i_uid,&root_inode->i_gid,&sbi->oz_pgrp,&minproto,&maxproto) ) {
171 printk("autofs: called with bogus options\n");
175 /* Couldn't this be tested earlier? */
176 if ( minproto > AUTOFS_PROTO_VERSION ||
177 maxproto < AUTOFS_PROTO_VERSION ) {
178 printk("autofs: kernel does not match daemon version\n");
182 DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp));
186 printk("autofs: could not open pipe file descriptor\n");
189 if ( !pipe->f_op || !pipe->f_op->write )
195 * Success! Install the root dentry now to indicate completion.
201 printk("autofs: pipe file descriptor does not contain proper ops\n");
207 printk("autofs: get root dentry failed\n");
217 static void autofs_read_inode(struct inode *inode)
219 ino_t ino = inode->i_ino;
221 struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
223 /* Initialize to the default case (stub directory) */
225 inode->i_op = &simple_dir_inode_operations;
226 inode->i_fop = &simple_dir_operations;
227 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
229 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
232 if ( ino == AUTOFS_ROOT_INO ) {
233 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
234 inode->i_op = &autofs_root_inode_operations;
235 inode->i_fop = &autofs_root_operations;
236 inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
240 inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
241 inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
243 if ( ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO ) {
244 /* Symlink inode - should be in symlink list */
245 struct autofs_symlink *sl;
247 n = ino - AUTOFS_FIRST_SYMLINK;
248 if ( n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
249 printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
253 inode->i_op = &autofs_symlink_inode_operations;
254 sl = &sbi->symlink[n];
255 inode->i_private = sl;
256 inode->i_mode = S_IFLNK | S_IRWXUGO;
257 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec = sl->mtime;
258 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
259 inode->i_size = sl->len;