[PATCH] ISDN: Rename some debugging macros to not resemble CONFIG options
[usb.git] / fs / autofs / inode.c
blobf968d134280807bf7aaafb50d6aeb22a6a45d304
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/mm.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>
20 #include "autofs_i.h"
21 #include <linux/module.h>
23 void autofs_kill_sb(struct super_block *sb)
25 struct autofs_sb_info *sbi = autofs_sbi(sb);
26 unsigned int n;
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
32 * deactivate_super.
34 if (!sbi)
35 goto out_kill_sb;
37 if ( !sbi->catatonic )
38 autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
40 autofs_hash_nuke(sbi);
41 for ( n = 0 ; n < AUTOFS_MAX_SYMLINKS ; n++ ) {
42 if ( test_bit(n, sbi->symlink_bitmap) )
43 kfree(sbi->symlink[n].data);
46 kfree(sb->s_fs_info);
48 out_kill_sb:
49 DPRINTK(("autofs: shutting down\n"));
50 kill_anon_super(sb);
53 static void autofs_read_inode(struct inode *inode);
55 static struct super_operations autofs_sops = {
56 .read_inode = autofs_read_inode,
57 .statfs = simple_statfs,
60 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
62 static match_table_t autofs_tokens = {
63 {Opt_fd, "fd=%u"},
64 {Opt_uid, "uid=%u"},
65 {Opt_gid, "gid=%u"},
66 {Opt_pgrp, "pgrp=%u"},
67 {Opt_minproto, "minproto=%u"},
68 {Opt_maxproto, "maxproto=%u"},
69 {Opt_err, NULL}
72 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto)
74 char *p;
75 substring_t args[MAX_OPT_ARGS];
76 int option;
78 *uid = current->uid;
79 *gid = current->gid;
80 *pgrp = process_group(current);
82 *minproto = *maxproto = AUTOFS_PROTO_VERSION;
84 *pipefd = -1;
86 if (!options)
87 return 1;
89 while ((p = strsep(&options, ",")) != NULL) {
90 int token;
91 if (!*p)
92 continue;
94 token = match_token(p, autofs_tokens, args);
95 switch (token) {
96 case Opt_fd:
97 if (match_int(&args[0], &option))
98 return 1;
99 *pipefd = option;
100 break;
101 case Opt_uid:
102 if (match_int(&args[0], &option))
103 return 1;
104 *uid = option;
105 break;
106 case Opt_gid:
107 if (match_int(&args[0], &option))
108 return 1;
109 *gid = option;
110 break;
111 case Opt_pgrp:
112 if (match_int(&args[0], &option))
113 return 1;
114 *pgrp = option;
115 break;
116 case Opt_minproto:
117 if (match_int(&args[0], &option))
118 return 1;
119 *minproto = option;
120 break;
121 case Opt_maxproto:
122 if (match_int(&args[0], &option))
123 return 1;
124 *maxproto = option;
125 break;
126 default:
127 return 1;
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;
137 struct file * pipe;
138 int pipefd;
139 struct autofs_sb_info *sbi;
140 int minproto, maxproto;
142 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
143 if ( !sbi )
144 goto fail_unlock;
145 DPRINTK(("autofs: starting up, sbi = %p\n",sbi));
147 s->s_fs_info = sbi;
148 sbi->magic = AUTOFS_SBI_MAGIC;
149 sbi->pipe = NULL;
150 sbi->catatonic = 1;
151 sbi->exp_timeout = 0;
152 sbi->oz_pgrp = process_group(current);
153 autofs_initialize_hash(&sbi->dirhash);
154 sbi->queues = NULL;
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;
161 s->s_time_gran = 1;
162 sbi->sb = s;
164 root_inode = iget(s, AUTOFS_ROOT_INO);
165 root = d_alloc_root(root_inode);
166 pipe = NULL;
168 if (!root)
169 goto fail_iput;
171 /* Can this call block? - WTF cares? s is locked. */
172 if ( parse_options(data,&pipefd,&root_inode->i_uid,&root_inode->i_gid,&sbi->oz_pgrp,&minproto,&maxproto) ) {
173 printk("autofs: called with bogus options\n");
174 goto fail_dput;
177 /* Couldn't this be tested earlier? */
178 if ( minproto > AUTOFS_PROTO_VERSION ||
179 maxproto < AUTOFS_PROTO_VERSION ) {
180 printk("autofs: kernel does not match daemon version\n");
181 goto fail_dput;
184 DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp));
185 pipe = fget(pipefd);
187 if ( !pipe ) {
188 printk("autofs: could not open pipe file descriptor\n");
189 goto fail_dput;
191 if ( !pipe->f_op || !pipe->f_op->write )
192 goto fail_fput;
193 sbi->pipe = pipe;
194 sbi->catatonic = 0;
197 * Success! Install the root dentry now to indicate completion.
199 s->s_root = root;
200 return 0;
202 fail_fput:
203 printk("autofs: pipe file descriptor does not contain proper ops\n");
204 fput(pipe);
205 fail_dput:
206 dput(root);
207 goto fail_free;
208 fail_iput:
209 printk("autofs: get root dentry failed\n");
210 iput(root_inode);
211 fail_free:
212 kfree(sbi);
213 s->s_fs_info = NULL;
214 fail_unlock:
215 return -EINVAL;
218 static void autofs_read_inode(struct inode *inode)
220 ino_t ino = inode->i_ino;
221 unsigned int n;
222 struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
224 /* Initialize to the default case (stub directory) */
226 inode->i_op = &simple_dir_inode_operations;
227 inode->i_fop = &simple_dir_operations;
228 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
229 inode->i_nlink = 2;
230 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
231 inode->i_blocks = 0;
233 if ( ino == AUTOFS_ROOT_INO ) {
234 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
235 inode->i_op = &autofs_root_inode_operations;
236 inode->i_fop = &autofs_root_operations;
237 inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
238 return;
241 inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
242 inode->i_gid = inode->i_sb->s_root->d_inode->i_gid;
244 if ( ino >= AUTOFS_FIRST_SYMLINK && ino < AUTOFS_FIRST_DIR_INO ) {
245 /* Symlink inode - should be in symlink list */
246 struct autofs_symlink *sl;
248 n = ino - AUTOFS_FIRST_SYMLINK;
249 if ( n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
250 printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
251 return;
254 inode->i_op = &autofs_symlink_inode_operations;
255 sl = &sbi->symlink[n];
256 inode->i_private = sl;
257 inode->i_mode = S_IFLNK | S_IRWXUGO;
258 inode->i_mtime.tv_sec = inode->i_ctime.tv_sec = sl->mtime;
259 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
260 inode->i_size = sl->len;
261 inode->i_nlink = 1;