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>
14 #include <linux/slab.h>
15 #include <linux/file.h>
16 #include <linux/locks.h>
17 #include <asm/bitops.h>
19 #define __NO_VERSION__
20 #include <linux/module.h>
22 static void autofs_put_super(struct super_block *sb)
24 struct autofs_sb_info *sbi = autofs_sbi(sb);
27 if ( !sbi->catatonic )
28 autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
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);
36 kfree(sb->u.generic_sbp);
38 DPRINTK(("autofs: shutting down\n"));
41 static int autofs_statfs(struct super_block *sb, struct statfs *buf);
42 static void autofs_read_inode(struct inode *inode);
44 static struct super_operations autofs_sops = {
45 read_inode: autofs_read_inode,
46 put_super: autofs_put_super,
47 statfs: autofs_statfs,
50 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto)
52 char *this_char, *value;
56 *pgrp = current->pgrp;
58 *minproto = *maxproto = AUTOFS_PROTO_VERSION;
62 if ( !options ) return 1;
63 for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
64 if ((value = strchr(this_char,'=')) != NULL)
66 if (!strcmp(this_char,"fd")) {
67 if (!value || !*value)
69 *pipefd = simple_strtoul(value,&value,0);
73 else if (!strcmp(this_char,"uid")) {
74 if (!value || !*value)
76 *uid = simple_strtoul(value,&value,0);
80 else if (!strcmp(this_char,"gid")) {
81 if (!value || !*value)
83 *gid = simple_strtoul(value,&value,0);
87 else if (!strcmp(this_char,"pgrp")) {
88 if (!value || !*value)
90 *pgrp = simple_strtoul(value,&value,0);
94 else if (!strcmp(this_char,"minproto")) {
95 if (!value || !*value)
97 *minproto = simple_strtoul(value,&value,0);
101 else if (!strcmp(this_char,"maxproto")) {
102 if (!value || !*value)
104 *maxproto = simple_strtoul(value,&value,0);
110 return (*pipefd < 0);
113 struct super_block *autofs_read_super(struct super_block *s, void *data,
116 struct inode * root_inode;
117 struct dentry * root;
120 struct autofs_sb_info *sbi;
121 int minproto, maxproto;
123 sbi = (struct autofs_sb_info *) kmalloc(sizeof(struct autofs_sb_info), GFP_KERNEL);
126 DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
128 s->u.generic_sbp = sbi;
129 sbi->magic = AUTOFS_SBI_MAGIC;
131 sbi->exp_timeout = 0;
132 sbi->oz_pgrp = current->pgrp;
133 autofs_initialize_hash(&sbi->dirhash);
135 memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN);
136 sbi->next_dir_ino = AUTOFS_FIRST_DIR_INO;
137 s->s_blocksize = 1024;
138 s->s_blocksize_bits = 10;
139 s->s_magic = AUTOFS_SUPER_MAGIC;
140 s->s_op = &autofs_sops;
142 root_inode = iget(s, AUTOFS_ROOT_INO);
143 root = d_alloc_root(root_inode);
149 /* Can this call block? - WTF cares? s is locked. */
150 if ( parse_options(data,&pipefd,&root_inode->i_uid,&root_inode->i_gid,&sbi->oz_pgrp,&minproto,&maxproto) ) {
151 printk("autofs: called with bogus options\n");
155 /* Couldn't this be tested earlier? */
156 if ( minproto > AUTOFS_PROTO_VERSION ||
157 maxproto < AUTOFS_PROTO_VERSION ) {
158 printk("autofs: kernel does not match daemon version\n");
162 DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp));
166 printk("autofs: could not open pipe file descriptor\n");
169 if ( !pipe->f_op || !pipe->f_op->write )
174 * Success! Install the root dentry now to indicate completion.
180 printk("autofs: pipe file descriptor does not contain proper ops\n");
186 printk("autofs: get root dentry failed\n");
194 static int autofs_statfs(struct super_block *sb, struct statfs *buf)
196 buf->f_type = AUTOFS_SUPER_MAGIC;
198 buf->f_namelen = NAME_MAX;
202 static void autofs_read_inode(struct inode *inode)
204 ino_t ino = inode->i_ino;
206 struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
208 /* Initialize to the default case (stub directory) */
210 inode->i_op = &autofs_dir_inode_operations;
211 inode->i_fop = &dcache_dir_ops;
212 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
214 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
216 inode->i_blksize = 1024;
218 if ( ino == AUTOFS_ROOT_INO ) {
219 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
220 inode->i_op = &autofs_root_inode_operations;
221 inode->i_fop = &autofs_root_operations;
222 inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
226 inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
227 inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
229 if ( ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO ) {
230 /* Symlink inode - should be in symlink list */
231 struct autofs_symlink *sl;
233 n = ino - AUTOFS_FIRST_SYMLINK;
234 if ( n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
235 printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
239 inode->i_op = &autofs_symlink_inode_operations;
240 sl = &sbi->symlink[n];
241 inode->u.generic_ip = sl;
242 inode->i_mode = S_IFLNK | S_IRWXUGO;
243 inode->i_mtime = inode->i_ctime = sl->mtime;
244 inode->i_size = sl->len;