2 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
3 * Copyright 2005-2006 Ian Kent <raven@themaw.net>
5 * This file is part of the Linux kernel and is made available under
6 * the terms of the GNU General Public License, version 2, or at your
7 * option, any later version, incorporated herein by reference.
10 #include <linux/seq_file.h>
11 #include <linux/pagemap.h>
12 #include <linux/parser.h>
16 struct autofs_info *autofs_new_ino(struct autofs_sb_info *sbi)
18 struct autofs_info *ino;
20 ino = kzalloc(sizeof(*ino), GFP_KERNEL);
22 INIT_LIST_HEAD(&ino->active);
23 INIT_LIST_HEAD(&ino->expiring);
24 ino->last_used = jiffies;
30 void autofs_clean_ino(struct autofs_info *ino)
32 ino->uid = GLOBAL_ROOT_UID;
33 ino->gid = GLOBAL_ROOT_GID;
34 ino->last_used = jiffies;
37 void autofs_free_ino(struct autofs_info *ino)
42 void autofs_kill_sb(struct super_block *sb)
44 struct autofs_sb_info *sbi = autofs_sbi(sb);
47 * In the event of a failure in get_sb_nodev the superblock
48 * info is not present so nothing else has been setup, so
49 * just call kill_anon_super when we are called from
53 /* Free wait queues, close pipe */
54 autofs_catatonic_mode(sbi);
55 put_pid(sbi->oz_pgrp);
58 pr_debug("shutting down\n");
59 kill_litter_super(sb);
64 static int autofs_show_options(struct seq_file *m, struct dentry *root)
66 struct autofs_sb_info *sbi = autofs_sbi(root->d_sb);
67 struct inode *root_inode = d_inode(root->d_sb->s_root);
72 seq_printf(m, ",fd=%d", sbi->pipefd);
73 if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
74 seq_printf(m, ",uid=%u",
75 from_kuid_munged(&init_user_ns, root_inode->i_uid));
76 if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
77 seq_printf(m, ",gid=%u",
78 from_kgid_munged(&init_user_ns, root_inode->i_gid));
79 seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
80 seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
81 seq_printf(m, ",minproto=%d", sbi->min_proto);
82 seq_printf(m, ",maxproto=%d", sbi->max_proto);
84 if (autofs_type_offset(sbi->type))
85 seq_puts(m, ",offset");
86 else if (autofs_type_direct(sbi->type))
87 seq_puts(m, ",direct");
89 seq_puts(m, ",indirect");
90 if (sbi->flags & AUTOFS_SBI_STRICTEXPIRE)
91 seq_puts(m, ",strictexpire");
92 if (sbi->flags & AUTOFS_SBI_IGNORE)
93 seq_puts(m, ",ignore");
94 #ifdef CONFIG_CHECKPOINT_RESTORE
96 seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino);
98 seq_puts(m, ",pipe_ino=-1");
103 static void autofs_evict_inode(struct inode *inode)
106 kfree(inode->i_private);
109 static const struct super_operations autofs_sops = {
110 .statfs = simple_statfs,
111 .show_options = autofs_show_options,
112 .evict_inode = autofs_evict_inode,
115 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
116 Opt_indirect, Opt_direct, Opt_offset, Opt_strictexpire,
119 static const match_table_t tokens = {
123 {Opt_pgrp, "pgrp=%u"},
124 {Opt_minproto, "minproto=%u"},
125 {Opt_maxproto, "maxproto=%u"},
126 {Opt_indirect, "indirect"},
127 {Opt_direct, "direct"},
128 {Opt_offset, "offset"},
129 {Opt_strictexpire, "strictexpire"},
130 {Opt_ignore, "ignore"},
134 static int parse_options(char *options,
135 struct inode *root, int *pgrp, bool *pgrp_set,
136 struct autofs_sb_info *sbi)
139 substring_t args[MAX_OPT_ARGS];
145 root->i_uid = current_uid();
146 root->i_gid = current_gid();
148 sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
149 sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
156 while ((p = strsep(&options, ",")) != NULL) {
162 token = match_token(p, tokens, args);
165 if (match_int(args, &pipefd))
167 sbi->pipefd = pipefd;
170 if (match_int(args, &option))
172 uid = make_kuid(current_user_ns(), option);
178 if (match_int(args, &option))
180 gid = make_kgid(current_user_ns(), option);
186 if (match_int(args, &option))
192 if (match_int(args, &option))
194 sbi->min_proto = option;
197 if (match_int(args, &option))
199 sbi->max_proto = option;
202 set_autofs_type_indirect(&sbi->type);
205 set_autofs_type_direct(&sbi->type);
208 set_autofs_type_offset(&sbi->type);
210 case Opt_strictexpire:
211 sbi->flags |= AUTOFS_SBI_STRICTEXPIRE;
214 sbi->flags |= AUTOFS_SBI_IGNORE;
220 return (sbi->pipefd < 0);
223 int autofs_fill_super(struct super_block *s, void *data, int silent)
225 struct inode *root_inode;
228 struct autofs_sb_info *sbi;
229 struct autofs_info *ino;
231 bool pgrp_set = false;
234 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
237 pr_debug("starting up, sbi = %p\n", sbi);
240 sbi->magic = AUTOFS_SBI_MAGIC;
243 sbi->exp_timeout = 0;
247 sbi->sub_version = 0;
248 sbi->flags = AUTOFS_SBI_CATATONIC;
249 set_autofs_type_indirect(&sbi->type);
252 mutex_init(&sbi->wq_mutex);
253 mutex_init(&sbi->pipe_mutex);
254 spin_lock_init(&sbi->fs_lock);
256 spin_lock_init(&sbi->lookup_lock);
257 INIT_LIST_HEAD(&sbi->active_list);
258 INIT_LIST_HEAD(&sbi->expiring_list);
259 s->s_blocksize = 1024;
260 s->s_blocksize_bits = 10;
261 s->s_magic = AUTOFS_SUPER_MAGIC;
262 s->s_op = &autofs_sops;
263 s->s_d_op = &autofs_dentry_operations;
267 * Get the root inode and dentry, but defer checking for errors.
269 ino = autofs_new_ino(sbi);
274 root_inode = autofs_get_inode(s, S_IFDIR | 0755);
275 root = d_make_root(root_inode);
282 root->d_fsdata = ino;
284 /* Can this call block? */
285 if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
286 pr_err("called with bogus options\n");
290 /* Test versions first */
291 if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
292 sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
293 pr_err("kernel does not match daemon version "
294 "daemon (%d, %d) kernel (%d, %d)\n",
295 sbi->min_proto, sbi->max_proto,
296 AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
300 /* Establish highest kernel protocol version */
301 if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
302 sbi->version = AUTOFS_MAX_PROTO_VERSION;
304 sbi->version = sbi->max_proto;
305 sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
308 sbi->oz_pgrp = find_get_pid(pgrp);
310 pr_err("could not find process group %d\n",
315 sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
318 if (autofs_type_trigger(sbi->type))
319 __managed_dentry_set_managed(root);
321 root_inode->i_fop = &autofs_root_operations;
322 root_inode->i_op = &autofs_dir_inode_operations;
324 pr_debug("pipe fd = %d, pgrp = %u\n",
325 sbi->pipefd, pid_nr(sbi->oz_pgrp));
326 pipe = fget(sbi->pipefd);
329 pr_err("could not open pipe file descriptor\n");
332 ret = autofs_prepare_pipe(pipe);
336 sbi->flags &= ~AUTOFS_SBI_CATATONIC;
339 * Success! Install the root dentry now to indicate completion.
345 * Failure ... clean up.
348 pr_err("pipe file descriptor does not contain proper ops\n");
351 put_pid(sbi->oz_pgrp);
356 autofs_free_ino(ino);
363 struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
365 struct inode *inode = new_inode(sb);
370 inode->i_mode = mode;
372 inode->i_uid = d_inode(sb->s_root)->i_uid;
373 inode->i_gid = d_inode(sb->s_root)->i_gid;
375 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
376 inode->i_ino = get_next_ino();
380 inode->i_op = &autofs_dir_inode_operations;
381 inode->i_fop = &autofs_dir_operations;
382 } else if (S_ISLNK(mode)) {
383 inode->i_op = &autofs_symlink_inode_operations;