1 /* -*- c -*- --------------------------------------------------------------- *
3 * linux/fs/autofs/inode.c
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
6 * Copyright 2005-2006 Ian Kent <raven@themaw.net>
8 * This file is part of the Linux kernel and is made available under
9 * the terms of the GNU General Public License, version 2, or at your
10 * option, any later version, incorporated herein by reference.
12 * ------------------------------------------------------------------------- */
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/file.h>
17 #include <linux/seq_file.h>
18 #include <linux/pagemap.h>
19 #include <linux/parser.h>
20 #include <linux/bitops.h>
21 #include <linux/magic.h>
22 #include <linux/compat.h>
24 #include <linux/module.h>
26 struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
28 struct autofs_info *ino = kzalloc(sizeof(*ino), GFP_KERNEL);
30 INIT_LIST_HEAD(&ino->active);
31 INIT_LIST_HEAD(&ino->expiring);
32 ino->last_used = jiffies;
38 void autofs4_clean_ino(struct autofs_info *ino)
42 ino->last_used = jiffies;
45 void autofs4_free_ino(struct autofs_info *ino)
50 void autofs4_kill_sb(struct super_block *sb)
52 struct autofs_sb_info *sbi = autofs4_sbi(sb);
55 * In the event of a failure in get_sb_nodev the superblock
56 * info is not present so nothing else has been setup, so
57 * just call kill_anon_super when we are called from
63 /* Free wait queues, close pipe */
64 autofs4_catatonic_mode(sbi);
70 DPRINTK("shutting down");
71 kill_litter_super(sb);
74 static int autofs4_show_options(struct seq_file *m, struct dentry *root)
76 struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
77 struct inode *root_inode = root->d_sb->s_root->d_inode;
82 seq_printf(m, ",fd=%d", sbi->pipefd);
83 if (root_inode->i_uid != 0)
84 seq_printf(m, ",uid=%u", root_inode->i_uid);
85 if (root_inode->i_gid != 0)
86 seq_printf(m, ",gid=%u", root_inode->i_gid);
87 seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
88 seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
89 seq_printf(m, ",minproto=%d", sbi->min_proto);
90 seq_printf(m, ",maxproto=%d", sbi->max_proto);
92 if (autofs_type_offset(sbi->type))
93 seq_printf(m, ",offset");
94 else if (autofs_type_direct(sbi->type))
95 seq_printf(m, ",direct");
97 seq_printf(m, ",indirect");
102 static void autofs4_evict_inode(struct inode *inode)
104 end_writeback(inode);
105 kfree(inode->i_private);
108 static const struct super_operations autofs4_sops = {
109 .statfs = simple_statfs,
110 .show_options = autofs4_show_options,
111 .evict_inode = autofs4_evict_inode,
114 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
115 Opt_indirect, Opt_direct, Opt_offset};
117 static const match_table_t tokens = {
121 {Opt_pgrp, "pgrp=%u"},
122 {Opt_minproto, "minproto=%u"},
123 {Opt_maxproto, "maxproto=%u"},
124 {Opt_indirect, "indirect"},
125 {Opt_direct, "direct"},
126 {Opt_offset, "offset"},
130 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
131 pid_t *pgrp, unsigned int *type, int *minproto, int *maxproto)
134 substring_t args[MAX_OPT_ARGS];
137 *uid = current_uid();
138 *gid = current_gid();
139 *pgrp = task_pgrp_nr(current);
141 *minproto = AUTOFS_MIN_PROTO_VERSION;
142 *maxproto = AUTOFS_MAX_PROTO_VERSION;
149 while ((p = strsep(&options, ",")) != NULL) {
154 token = match_token(p, tokens, args);
157 if (match_int(args, pipefd))
161 if (match_int(args, &option))
166 if (match_int(args, &option))
171 if (match_int(args, &option))
176 if (match_int(args, &option))
181 if (match_int(args, &option))
186 set_autofs_type_indirect(type);
189 set_autofs_type_direct(type);
192 set_autofs_type_offset(type);
198 return (*pipefd < 0);
201 int autofs4_fill_super(struct super_block *s, void *data, int silent)
203 struct inode * root_inode;
204 struct dentry * root;
207 struct autofs_sb_info *sbi;
208 struct autofs_info *ino;
210 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
213 DPRINTK("starting up, sbi = %p",sbi);
216 sbi->magic = AUTOFS_SBI_MAGIC;
220 sbi->exp_timeout = 0;
221 sbi->oz_pgrp = task_pgrp_nr(current);
224 sbi->sub_version = 0;
225 set_autofs_type_indirect(&sbi->type);
228 sbi->compat_daemon = is_compat_task();
229 mutex_init(&sbi->wq_mutex);
230 mutex_init(&sbi->pipe_mutex);
231 spin_lock_init(&sbi->fs_lock);
233 spin_lock_init(&sbi->lookup_lock);
234 INIT_LIST_HEAD(&sbi->active_list);
235 INIT_LIST_HEAD(&sbi->expiring_list);
236 s->s_blocksize = 1024;
237 s->s_blocksize_bits = 10;
238 s->s_magic = AUTOFS_SUPER_MAGIC;
239 s->s_op = &autofs4_sops;
240 s->s_d_op = &autofs4_dentry_operations;
244 * Get the root inode and dentry, but defer checking for errors.
246 ino = autofs4_new_ino(sbi);
249 root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
250 root = d_make_root(root_inode);
255 root->d_fsdata = ino;
257 /* Can this call block? */
258 if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
259 &sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
261 printk("autofs: called with bogus options\n");
265 if (autofs_type_trigger(sbi->type))
266 __managed_dentry_set_managed(root);
268 root_inode->i_fop = &autofs4_root_operations;
269 root_inode->i_op = &autofs4_dir_inode_operations;
271 /* Couldn't this be tested earlier? */
272 if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
273 sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
274 printk("autofs: kernel does not match daemon version "
275 "daemon (%d, %d) kernel (%d, %d)\n",
276 sbi->min_proto, sbi->max_proto,
277 AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
281 /* Establish highest kernel protocol version */
282 if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
283 sbi->version = AUTOFS_MAX_PROTO_VERSION;
285 sbi->version = sbi->max_proto;
286 sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
288 DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
292 printk("autofs: could not open pipe file descriptor\n");
295 if (!pipe->f_op || !pipe->f_op->write)
298 sbi->pipefd = pipefd;
302 * Success! Install the root dentry now to indicate completion.
308 * Failure ... clean up.
311 printk("autofs: pipe file descriptor does not contain proper ops\n");
326 struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
328 struct inode *inode = new_inode(sb);
333 inode->i_mode = mode;
335 inode->i_uid = sb->s_root->d_inode->i_uid;
336 inode->i_gid = sb->s_root->d_inode->i_gid;
338 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
339 inode->i_ino = get_next_ino();
343 inode->i_op = &autofs4_dir_inode_operations;
344 inode->i_fop = &autofs4_dir_operations;
345 } else if (S_ISLNK(mode)) {
346 inode->i_op = &autofs4_symlink_inode_operations;