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>
23 #include <linux/module.h>
25 struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
27 struct autofs_info *ino = kzalloc(sizeof(*ino), GFP_KERNEL);
29 INIT_LIST_HEAD(&ino->active);
30 INIT_LIST_HEAD(&ino->expiring);
31 ino->last_used = jiffies;
37 void autofs4_clean_ino(struct autofs_info *ino)
41 ino->last_used = jiffies;
44 void autofs4_free_ino(struct autofs_info *ino)
47 ino->dentry->d_fsdata = NULL;
53 void autofs4_kill_sb(struct super_block *sb)
55 struct autofs_sb_info *sbi = autofs4_sbi(sb);
58 * In the event of a failure in get_sb_nodev the superblock
59 * info is not present so nothing else has been setup, so
60 * just call kill_anon_super when we are called from
66 /* Free wait queues, close pipe */
67 autofs4_catatonic_mode(sbi);
73 DPRINTK("shutting down");
74 kill_litter_super(sb);
77 static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
79 struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
80 struct inode *root_inode = mnt->mnt_sb->s_root->d_inode;
85 seq_printf(m, ",fd=%d", sbi->pipefd);
86 if (root_inode->i_uid != 0)
87 seq_printf(m, ",uid=%u", root_inode->i_uid);
88 if (root_inode->i_gid != 0)
89 seq_printf(m, ",gid=%u", root_inode->i_gid);
90 seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
91 seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
92 seq_printf(m, ",minproto=%d", sbi->min_proto);
93 seq_printf(m, ",maxproto=%d", sbi->max_proto);
95 if (autofs_type_offset(sbi->type))
96 seq_printf(m, ",offset");
97 else if (autofs_type_direct(sbi->type))
98 seq_printf(m, ",direct");
100 seq_printf(m, ",indirect");
105 static void autofs4_evict_inode(struct inode *inode)
107 end_writeback(inode);
108 kfree(inode->i_private);
111 static const struct super_operations autofs4_sops = {
112 .statfs = simple_statfs,
113 .show_options = autofs4_show_options,
114 .evict_inode = autofs4_evict_inode,
117 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
118 Opt_indirect, Opt_direct, Opt_offset};
120 static const match_table_t tokens = {
124 {Opt_pgrp, "pgrp=%u"},
125 {Opt_minproto, "minproto=%u"},
126 {Opt_maxproto, "maxproto=%u"},
127 {Opt_indirect, "indirect"},
128 {Opt_direct, "direct"},
129 {Opt_offset, "offset"},
133 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
134 pid_t *pgrp, unsigned int *type, int *minproto, int *maxproto)
137 substring_t args[MAX_OPT_ARGS];
140 *uid = current_uid();
141 *gid = current_gid();
142 *pgrp = task_pgrp_nr(current);
144 *minproto = AUTOFS_MIN_PROTO_VERSION;
145 *maxproto = AUTOFS_MAX_PROTO_VERSION;
152 while ((p = strsep(&options, ",")) != NULL) {
157 token = match_token(p, tokens, args);
160 if (match_int(args, pipefd))
164 if (match_int(args, &option))
169 if (match_int(args, &option))
174 if (match_int(args, &option))
179 if (match_int(args, &option))
184 if (match_int(args, &option))
189 set_autofs_type_indirect(type);
192 set_autofs_type_direct(type);
195 set_autofs_type_offset(type);
201 return (*pipefd < 0);
204 int autofs4_fill_super(struct super_block *s, void *data, int silent)
206 struct inode * root_inode;
207 struct dentry * root;
210 struct autofs_sb_info *sbi;
211 struct autofs_info *ino;
213 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
216 DPRINTK("starting up, sbi = %p",sbi);
219 sbi->magic = AUTOFS_SBI_MAGIC;
223 sbi->exp_timeout = 0;
224 sbi->oz_pgrp = task_pgrp_nr(current);
227 sbi->sub_version = 0;
228 set_autofs_type_indirect(&sbi->type);
231 mutex_init(&sbi->wq_mutex);
232 spin_lock_init(&sbi->fs_lock);
234 spin_lock_init(&sbi->lookup_lock);
235 INIT_LIST_HEAD(&sbi->active_list);
236 INIT_LIST_HEAD(&sbi->expiring_list);
237 s->s_blocksize = 1024;
238 s->s_blocksize_bits = 10;
239 s->s_magic = AUTOFS_SUPER_MAGIC;
240 s->s_op = &autofs4_sops;
241 s->s_d_op = &autofs4_dentry_operations;
245 * Get the root inode and dentry, but defer checking for errors.
247 ino = autofs4_new_ino(sbi);
250 root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
254 root = d_alloc_root(root_inode);
259 root->d_fsdata = ino;
261 /* Can this call block? */
262 if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
263 &sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
265 printk("autofs: called with bogus options\n");
269 if (autofs_type_trigger(sbi->type))
270 __managed_dentry_set_managed(root);
272 root_inode->i_fop = &autofs4_root_operations;
273 root_inode->i_op = &autofs4_dir_inode_operations;
275 /* Couldn't this be tested earlier? */
276 if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
277 sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
278 printk("autofs: kernel does not match daemon version "
279 "daemon (%d, %d) kernel (%d, %d)\n",
280 sbi->min_proto, sbi->max_proto,
281 AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
285 /* Establish highest kernel protocol version */
286 if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
287 sbi->version = AUTOFS_MAX_PROTO_VERSION;
289 sbi->version = sbi->max_proto;
290 sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
292 DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
296 printk("autofs: could not open pipe file descriptor\n");
299 if (!pipe->f_op || !pipe->f_op->write)
302 sbi->pipefd = pipefd;
306 * Success! Install the root dentry now to indicate completion.
312 * Failure ... clean up.
315 printk("autofs: pipe file descriptor does not contain proper ops\n");
322 printk("autofs: get root dentry failed\n");
333 struct inode *autofs4_get_inode(struct super_block *sb, mode_t mode)
335 struct inode *inode = new_inode(sb);
340 inode->i_mode = mode;
342 inode->i_uid = sb->s_root->d_inode->i_uid;
343 inode->i_gid = sb->s_root->d_inode->i_gid;
345 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
346 inode->i_ino = get_next_ino();
350 inode->i_op = &autofs4_dir_inode_operations;
351 inode->i_fop = &autofs4_dir_operations;
352 } else if (S_ISLNK(mode)) {
353 inode->i_op = &autofs4_symlink_inode_operations;