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/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/file.h>
13 #include <linux/seq_file.h>
14 #include <linux/pagemap.h>
15 #include <linux/parser.h>
16 #include <linux/bitops.h>
18 #include <linux/module.h>
20 struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
22 struct autofs_info *ino;
24 ino = kzalloc(sizeof(*ino), GFP_KERNEL);
26 INIT_LIST_HEAD(&ino->active);
27 INIT_LIST_HEAD(&ino->expiring);
28 ino->last_used = jiffies;
34 void autofs4_clean_ino(struct autofs_info *ino)
36 ino->uid = GLOBAL_ROOT_UID;
37 ino->gid = GLOBAL_ROOT_GID;
38 ino->last_used = jiffies;
41 void autofs4_free_ino(struct autofs_info *ino)
46 void autofs4_kill_sb(struct super_block *sb)
48 struct autofs_sb_info *sbi = autofs4_sbi(sb);
51 * In the event of a failure in get_sb_nodev the superblock
52 * info is not present so nothing else has been setup, so
53 * just call kill_anon_super when we are called from
57 /* Free wait queues, close pipe */
58 autofs4_catatonic_mode(sbi);
59 put_pid(sbi->oz_pgrp);
62 pr_debug("shutting down\n");
63 kill_litter_super(sb);
68 static int autofs4_show_options(struct seq_file *m, struct dentry *root)
70 struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
71 struct inode *root_inode = d_inode(root->d_sb->s_root);
76 seq_printf(m, ",fd=%d", sbi->pipefd);
77 if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
78 seq_printf(m, ",uid=%u",
79 from_kuid_munged(&init_user_ns, root_inode->i_uid));
80 if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
81 seq_printf(m, ",gid=%u",
82 from_kgid_munged(&init_user_ns, root_inode->i_gid));
83 seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
84 seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
85 seq_printf(m, ",minproto=%d", sbi->min_proto);
86 seq_printf(m, ",maxproto=%d", sbi->max_proto);
88 if (autofs_type_offset(sbi->type))
89 seq_printf(m, ",offset");
90 else if (autofs_type_direct(sbi->type))
91 seq_printf(m, ",direct");
93 seq_printf(m, ",indirect");
94 #ifdef CONFIG_CHECKPOINT_RESTORE
96 seq_printf(m, ",pipe_ino=%ld", file_inode(sbi->pipe)->i_ino);
98 seq_printf(m, ",pipe_ino=-1");
103 static void autofs4_evict_inode(struct inode *inode)
106 kfree(inode->i_private);
109 static const struct super_operations autofs4_sops = {
110 .statfs = simple_statfs,
111 .show_options = autofs4_show_options,
112 .evict_inode = autofs4_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};
118 static const match_table_t tokens = {
122 {Opt_pgrp, "pgrp=%u"},
123 {Opt_minproto, "minproto=%u"},
124 {Opt_maxproto, "maxproto=%u"},
125 {Opt_indirect, "indirect"},
126 {Opt_direct, "direct"},
127 {Opt_offset, "offset"},
131 static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
132 int *pgrp, bool *pgrp_set, unsigned int *type,
133 int *minproto, int *maxproto)
136 substring_t args[MAX_OPT_ARGS];
139 *uid = current_uid();
140 *gid = current_gid();
142 *minproto = AUTOFS_MIN_PROTO_VERSION;
143 *maxproto = AUTOFS_MAX_PROTO_VERSION;
150 while ((p = strsep(&options, ",")) != NULL) {
156 token = match_token(p, tokens, args);
159 if (match_int(args, pipefd))
163 if (match_int(args, &option))
165 *uid = make_kuid(current_user_ns(), option);
166 if (!uid_valid(*uid))
170 if (match_int(args, &option))
172 *gid = make_kgid(current_user_ns(), option);
173 if (!gid_valid(*gid))
177 if (match_int(args, &option))
183 if (match_int(args, &option))
188 if (match_int(args, &option))
193 set_autofs_type_indirect(type);
196 set_autofs_type_direct(type);
199 set_autofs_type_offset(type);
205 return (*pipefd < 0);
208 int autofs4_fill_super(struct super_block *s, void *data, int silent)
210 struct inode *root_inode;
214 struct autofs_sb_info *sbi;
215 struct autofs_info *ino;
217 bool pgrp_set = false;
220 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
223 pr_debug("starting up, sbi = %p\n", sbi);
226 sbi->magic = AUTOFS_SBI_MAGIC;
230 sbi->exp_timeout = 0;
234 sbi->sub_version = 0;
235 set_autofs_type_indirect(&sbi->type);
238 mutex_init(&sbi->wq_mutex);
239 mutex_init(&sbi->pipe_mutex);
240 spin_lock_init(&sbi->fs_lock);
242 spin_lock_init(&sbi->lookup_lock);
243 INIT_LIST_HEAD(&sbi->active_list);
244 INIT_LIST_HEAD(&sbi->expiring_list);
245 s->s_blocksize = 1024;
246 s->s_blocksize_bits = 10;
247 s->s_magic = AUTOFS_SUPER_MAGIC;
248 s->s_op = &autofs4_sops;
249 s->s_d_op = &autofs4_dentry_operations;
253 * Get the root inode and dentry, but defer checking for errors.
255 ino = autofs4_new_ino(sbi);
260 root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
261 root = d_make_root(root_inode);
268 root->d_fsdata = ino;
270 /* Can this call block? */
271 if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
272 &pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
274 pr_err("called with bogus options\n");
278 /* Test versions first */
279 if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
280 sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
281 pr_err("kernel does not match daemon version "
282 "daemon (%d, %d) kernel (%d, %d)\n",
283 sbi->min_proto, sbi->max_proto,
284 AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
288 /* Establish highest kernel protocol version */
289 if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
290 sbi->version = AUTOFS_MAX_PROTO_VERSION;
292 sbi->version = sbi->max_proto;
293 sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
296 sbi->oz_pgrp = find_get_pid(pgrp);
298 pr_err("could not find process group %d\n",
303 sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
306 if (autofs_type_trigger(sbi->type))
307 __managed_dentry_set_managed(root);
309 root_inode->i_fop = &autofs4_root_operations;
310 root_inode->i_op = &autofs4_dir_inode_operations;
312 pr_debug("pipe fd = %d, pgrp = %u\n", pipefd, pid_nr(sbi->oz_pgrp));
316 pr_err("could not open pipe file descriptor\n");
319 ret = autofs_prepare_pipe(pipe);
323 sbi->pipefd = pipefd;
327 * Success! Install the root dentry now to indicate completion.
333 * Failure ... clean up.
336 pr_err("pipe file descriptor does not contain proper ops\n");
339 put_pid(sbi->oz_pgrp);
344 autofs4_free_ino(ino);
351 struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
353 struct inode *inode = new_inode(sb);
358 inode->i_mode = mode;
360 inode->i_uid = d_inode(sb->s_root)->i_uid;
361 inode->i_gid = d_inode(sb->s_root)->i_gid;
363 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
364 inode->i_ino = get_next_ino();
368 inode->i_op = &autofs4_dir_inode_operations;
369 inode->i_fop = &autofs4_dir_operations;
370 } else if (S_ISLNK(mode)) {
371 inode->i_op = &autofs4_symlink_inode_operations;