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_printf(m, ",offset");
86 else if (autofs_type_direct(sbi->type))
87 seq_printf(m, ",direct");
89 seq_printf(m, ",indirect");
90 #ifdef CONFIG_CHECKPOINT_RESTORE
92 seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino);
94 seq_printf(m, ",pipe_ino=-1");
99 static void autofs_evict_inode(struct inode *inode)
102 kfree(inode->i_private);
105 static const struct super_operations autofs_sops = {
106 .statfs = simple_statfs,
107 .show_options = autofs_show_options,
108 .evict_inode = autofs_evict_inode,
111 enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
112 Opt_indirect, Opt_direct, Opt_offset};
114 static const match_table_t tokens = {
118 {Opt_pgrp, "pgrp=%u"},
119 {Opt_minproto, "minproto=%u"},
120 {Opt_maxproto, "maxproto=%u"},
121 {Opt_indirect, "indirect"},
122 {Opt_direct, "direct"},
123 {Opt_offset, "offset"},
127 static int parse_options(char *options,
128 struct inode *root, int *pgrp, bool *pgrp_set,
129 struct autofs_sb_info *sbi)
132 substring_t args[MAX_OPT_ARGS];
138 root->i_uid = current_uid();
139 root->i_gid = current_gid();
141 sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
142 sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
149 while ((p = strsep(&options, ",")) != NULL) {
155 token = match_token(p, tokens, args);
158 if (match_int(args, &pipefd))
160 sbi->pipefd = pipefd;
163 if (match_int(args, &option))
165 uid = make_kuid(current_user_ns(), option);
171 if (match_int(args, &option))
173 gid = make_kgid(current_user_ns(), option);
179 if (match_int(args, &option))
185 if (match_int(args, &option))
187 sbi->min_proto = option;
190 if (match_int(args, &option))
192 sbi->max_proto = option;
195 set_autofs_type_indirect(&sbi->type);
198 set_autofs_type_direct(&sbi->type);
201 set_autofs_type_offset(&sbi->type);
207 return (sbi->pipefd < 0);
210 int autofs_fill_super(struct super_block *s, void *data, int silent)
212 struct inode *root_inode;
215 struct autofs_sb_info *sbi;
216 struct autofs_info *ino;
218 bool pgrp_set = false;
221 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
224 pr_debug("starting up, sbi = %p\n", sbi);
227 sbi->magic = AUTOFS_SBI_MAGIC;
230 sbi->exp_timeout = 0;
234 sbi->sub_version = 0;
235 sbi->flags = AUTOFS_SBI_CATATONIC;
236 set_autofs_type_indirect(&sbi->type);
239 mutex_init(&sbi->wq_mutex);
240 mutex_init(&sbi->pipe_mutex);
241 spin_lock_init(&sbi->fs_lock);
243 spin_lock_init(&sbi->lookup_lock);
244 INIT_LIST_HEAD(&sbi->active_list);
245 INIT_LIST_HEAD(&sbi->expiring_list);
246 s->s_blocksize = 1024;
247 s->s_blocksize_bits = 10;
248 s->s_magic = AUTOFS_SUPER_MAGIC;
249 s->s_op = &autofs_sops;
250 s->s_d_op = &autofs_dentry_operations;
254 * Get the root inode and dentry, but defer checking for errors.
256 ino = autofs_new_ino(sbi);
261 root_inode = autofs_get_inode(s, S_IFDIR | 0755);
262 root = d_make_root(root_inode);
267 root->d_fsdata = ino;
269 /* Can this call block? */
270 if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
271 pr_err("called with bogus options\n");
275 /* Test versions first */
276 if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
277 sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
278 pr_err("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;
293 sbi->oz_pgrp = find_get_pid(pgrp);
295 pr_err("could not find process group %d\n",
300 sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
303 if (autofs_type_trigger(sbi->type))
304 __managed_dentry_set_managed(root);
306 root_inode->i_fop = &autofs_root_operations;
307 root_inode->i_op = &autofs_dir_inode_operations;
309 pr_debug("pipe fd = %d, pgrp = %u\n",
310 sbi->pipefd, pid_nr(sbi->oz_pgrp));
311 pipe = fget(sbi->pipefd);
314 pr_err("could not open pipe file descriptor\n");
317 ret = autofs_prepare_pipe(pipe);
321 sbi->flags &= ~AUTOFS_SBI_CATATONIC;
324 * Success! Install the root dentry now to indicate completion.
330 * Failure ... clean up.
333 pr_err("pipe file descriptor does not contain proper ops\n");
336 put_pid(sbi->oz_pgrp);
341 autofs_free_ino(ino);
348 struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
350 struct inode *inode = new_inode(sb);
355 inode->i_mode = mode;
357 inode->i_uid = d_inode(sb->s_root)->i_uid;
358 inode->i_gid = d_inode(sb->s_root)->i_gid;
360 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
361 inode->i_ino = get_next_ino();
365 inode->i_op = &autofs_dir_inode_operations;
366 inode->i_fop = &autofs_dir_operations;
367 } else if (S_ISLNK(mode)) {
368 inode->i_op = &autofs_symlink_inode_operations;