blob: 1c55388ae633c9908ab31934de070cbee08ae06f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* -*- c -*- --------------------------------------------------------------- *
2 *
3 * linux/fs/autofs/inode.c
4 *
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
Ian Kent34ca9592006-03-27 01:14:54 -08006 * Copyright 2005-2006 Ian Kent <raven@themaw.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
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.
11 *
12 * ------------------------------------------------------------------------- */
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/file.h>
Ian Kentd7c4a5f2006-03-27 01:14:49 -080017#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/pagemap.h>
19#include <linux/parser.h>
20#include <linux/bitops.h>
Jeff Garzike18fa702006-09-24 11:13:19 -040021#include <linux/magic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "autofs_i.h"
23#include <linux/module.h>
24
Al Viro26e6c912011-01-16 18:43:40 -050025struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -070026{
Al Viro26e6c912011-01-16 18:43:40 -050027 struct autofs_info *ino = kzalloc(sizeof(*ino), GFP_KERNEL);
28 if (ino) {
Ian Kent25767372008-07-23 21:30:12 -070029 INIT_LIST_HEAD(&ino->active);
30 INIT_LIST_HEAD(&ino->expiring);
Al Viro26e6c912011-01-16 18:43:40 -050031 ino->last_used = jiffies;
32 ino->sbi = sbi;
Ian Kent25767372008-07-23 21:30:12 -070033 }
Al Viro26e6c912011-01-16 18:43:40 -050034 return ino;
35}
Ian Kent25767372008-07-23 21:30:12 -070036
Al Viro26e6c912011-01-16 18:43:40 -050037void autofs4_clean_ino(struct autofs_info *ino)
38{
Eric W. Biederman45634cd2012-02-07 16:18:52 -080039 ino->uid = GLOBAL_ROOT_UID;
40 ino->gid = GLOBAL_ROOT_GID;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 ino->last_used = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042}
43
44void autofs4_free_ino(struct autofs_info *ino)
45{
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 kfree(ino);
47}
48
David Howells6ce31522006-10-11 01:22:15 -070049void autofs4_kill_sb(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
51 struct autofs_sb_info *sbi = autofs4_sbi(sb);
52
Ian Kentba8df432006-11-14 02:03:29 -080053 /*
54 * In the event of a failure in get_sb_nodev the superblock
55 * info is not present so nothing else has been setup, so
Jiri Kosinac949d4e2006-12-06 20:39:38 -080056 * just call kill_anon_super when we are called from
57 * deactivate_super.
Ian Kentba8df432006-11-14 02:03:29 -080058 */
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -080059 if (sbi) {
60 /* Free wait queues, close pipe */
Al Virobaa40672013-10-03 12:46:44 -040061 autofs4_catatonic_mode(sbi);
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -080062 put_pid(sbi->oz_pgrp);
63 }
Ian Kentba8df432006-11-14 02:03:29 -080064
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 DPRINTK("shutting down");
Al Viro5b7e9342010-01-24 00:28:52 -050066 kill_litter_super(sb);
Al Virobaa40672013-10-03 12:46:44 -040067 if (sbi)
68 kfree_rcu(sbi, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069}
70
Al Viro34c80b12011-12-08 21:32:45 -050071static int autofs4_show_options(struct seq_file *m, struct dentry *root)
Ian Kentd7c4a5f2006-03-27 01:14:49 -080072{
Al Viro34c80b12011-12-08 21:32:45 -050073 struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
74 struct inode *root_inode = root->d_sb->s_root->d_inode;
Ian Kentd7c4a5f2006-03-27 01:14:49 -080075
76 if (!sbi)
77 return 0;
78
79 seq_printf(m, ",fd=%d", sbi->pipefd);
Eric W. Biederman45634cd2012-02-07 16:18:52 -080080 if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
81 seq_printf(m, ",uid=%u",
82 from_kuid_munged(&init_user_ns, root_inode->i_uid));
83 if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
84 seq_printf(m, ",gid=%u",
85 from_kgid_munged(&init_user_ns, root_inode->i_gid));
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -080086 seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
Ian Kentd7c4a5f2006-03-27 01:14:49 -080087 seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
88 seq_printf(m, ",minproto=%d", sbi->min_proto);
89 seq_printf(m, ",maxproto=%d", sbi->max_proto);
90
Ian Kenta92daf62009-01-06 14:42:08 -080091 if (autofs_type_offset(sbi->type))
Ian Kent34ca9592006-03-27 01:14:54 -080092 seq_printf(m, ",offset");
Ian Kenta92daf62009-01-06 14:42:08 -080093 else if (autofs_type_direct(sbi->type))
Ian Kent34ca9592006-03-27 01:14:54 -080094 seq_printf(m, ",direct");
95 else
96 seq_printf(m, ",indirect");
97
Ian Kentd7c4a5f2006-03-27 01:14:49 -080098 return 0;
99}
100
Al Viro292c5ee2011-01-17 00:47:38 -0500101static void autofs4_evict_inode(struct inode *inode)
102{
Jan Karadbd57682012-05-03 14:48:02 +0200103 clear_inode(inode);
Al Viro292c5ee2011-01-17 00:47:38 -0500104 kfree(inode->i_private);
105}
106
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800107static const struct super_operations autofs4_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 .statfs = simple_statfs,
Ian Kentd7c4a5f2006-03-27 01:14:49 -0800109 .show_options = autofs4_show_options,
Al Viro292c5ee2011-01-17 00:47:38 -0500110 .evict_inode = autofs4_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111};
112
Ian Kent34ca9592006-03-27 01:14:54 -0800113enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
114 Opt_indirect, Opt_direct, Opt_offset};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Steven Whitehousea447c092008-10-13 10:46:57 +0100116static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 {Opt_fd, "fd=%u"},
118 {Opt_uid, "uid=%u"},
119 {Opt_gid, "gid=%u"},
120 {Opt_pgrp, "pgrp=%u"},
121 {Opt_minproto, "minproto=%u"},
122 {Opt_maxproto, "maxproto=%u"},
Ian Kent34ca9592006-03-27 01:14:54 -0800123 {Opt_indirect, "indirect"},
124 {Opt_direct, "direct"},
125 {Opt_offset, "offset"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 {Opt_err, NULL}
127};
128
Eric W. Biederman45634cd2012-02-07 16:18:52 -0800129static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800130 int *pgrp, bool *pgrp_set, unsigned int *type,
131 int *minproto, int *maxproto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
133 char *p;
134 substring_t args[MAX_OPT_ARGS];
135 int option;
136
David Howells0eb790e2008-11-14 10:38:46 +1100137 *uid = current_uid();
138 *gid = current_gid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 *minproto = AUTOFS_MIN_PROTO_VERSION;
141 *maxproto = AUTOFS_MAX_PROTO_VERSION;
142
143 *pipefd = -1;
144
145 if (!options)
146 return 1;
147
148 while ((p = strsep(&options, ",")) != NULL) {
149 int token;
150 if (!*p)
151 continue;
152
153 token = match_token(p, tokens, args);
154 switch (token) {
155 case Opt_fd:
156 if (match_int(args, pipefd))
157 return 1;
158 break;
159 case Opt_uid:
160 if (match_int(args, &option))
161 return 1;
Eric W. Biederman45634cd2012-02-07 16:18:52 -0800162 *uid = make_kuid(current_user_ns(), option);
163 if (!uid_valid(*uid))
164 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 break;
166 case Opt_gid:
167 if (match_int(args, &option))
168 return 1;
Eric W. Biederman45634cd2012-02-07 16:18:52 -0800169 *gid = make_kgid(current_user_ns(), option);
170 if (!gid_valid(*gid))
171 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 break;
173 case Opt_pgrp:
174 if (match_int(args, &option))
175 return 1;
176 *pgrp = option;
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800177 *pgrp_set = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 break;
179 case Opt_minproto:
180 if (match_int(args, &option))
181 return 1;
182 *minproto = option;
183 break;
184 case Opt_maxproto:
185 if (match_int(args, &option))
186 return 1;
187 *maxproto = option;
188 break;
Ian Kent34ca9592006-03-27 01:14:54 -0800189 case Opt_indirect:
Ian Kenta92daf62009-01-06 14:42:08 -0800190 set_autofs_type_indirect(type);
Ian Kent34ca9592006-03-27 01:14:54 -0800191 break;
192 case Opt_direct:
Ian Kenta92daf62009-01-06 14:42:08 -0800193 set_autofs_type_direct(type);
Ian Kent34ca9592006-03-27 01:14:54 -0800194 break;
195 case Opt_offset:
Ian Kenta92daf62009-01-06 14:42:08 -0800196 set_autofs_type_offset(type);
Ian Kent34ca9592006-03-27 01:14:54 -0800197 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 default:
199 return 1;
200 }
201 }
202 return (*pipefd < 0);
203}
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205int autofs4_fill_super(struct super_block *s, void *data, int silent)
206{
207 struct inode * root_inode;
208 struct dentry * root;
209 struct file * pipe;
210 int pipefd;
211 struct autofs_sb_info *sbi;
212 struct autofs_info *ino;
Ian Kent571ff472014-07-02 15:22:35 -0700213 int pgrp = 0;
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800214 bool pgrp_set = false;
Rui Xiangda29b752014-01-23 15:54:59 -0800215 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Mariusz Kozlowskib63d50c2007-10-16 23:26:44 -0700217 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700218 if (!sbi)
Rui Xiangda29b752014-01-23 15:54:59 -0800219 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 DPRINTK("starting up, sbi = %p",sbi);
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 s->s_fs_info = sbi;
223 sbi->magic = AUTOFS_SBI_MAGIC;
Ian Kentd7c4a5f2006-03-27 01:14:49 -0800224 sbi->pipefd = -1;
Ian Kentba8df432006-11-14 02:03:29 -0800225 sbi->pipe = NULL;
226 sbi->catatonic = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 sbi->exp_timeout = 0;
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800228 sbi->oz_pgrp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 sbi->sb = s;
230 sbi->version = 0;
231 sbi->sub_version = 0;
Ian Kenta92daf62009-01-06 14:42:08 -0800232 set_autofs_type_indirect(&sbi->type);
Ian Kentd7c4a5f2006-03-27 01:14:49 -0800233 sbi->min_proto = 0;
234 sbi->max_proto = 0;
Ingo Molnar1d5599e2006-03-23 03:00:41 -0800235 mutex_init(&sbi->wq_mutex);
Al Virod668dc52012-01-10 22:35:38 -0500236 mutex_init(&sbi->pipe_mutex);
Ian Kent3a9720c2005-05-01 08:59:17 -0700237 spin_lock_init(&sbi->fs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 sbi->queues = NULL;
Ian Kent5f6f4f22008-07-23 21:30:09 -0700239 spin_lock_init(&sbi->lookup_lock);
Ian Kent25767372008-07-23 21:30:12 -0700240 INIT_LIST_HEAD(&sbi->active_list);
Ian Kent5f6f4f22008-07-23 21:30:09 -0700241 INIT_LIST_HEAD(&sbi->expiring_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 s->s_blocksize = 1024;
243 s->s_blocksize_bits = 10;
244 s->s_magic = AUTOFS_SUPER_MAGIC;
245 s->s_op = &autofs4_sops;
David Howellsb650c852011-01-15 10:51:57 +0000246 s->s_d_op = &autofs4_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 s->s_time_gran = 1;
248
249 /*
250 * Get the root inode and dentry, but defer checking for errors.
251 */
Al Viro26e6c912011-01-16 18:43:40 -0500252 ino = autofs4_new_ino(sbi);
Rui Xiangda29b752014-01-23 15:54:59 -0800253 if (!ino) {
254 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 goto fail_free;
Rui Xiangda29b752014-01-23 15:54:59 -0800256 }
Al Viro726a5e02011-01-16 17:43:52 -0500257 root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
Al Viro48fde702012-01-08 22:15:13 -0500258 root = d_make_root(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 if (!root)
Al Viro48fde702012-01-08 22:15:13 -0500260 goto fail_ino;
Ian Kent34ca9592006-03-27 01:14:54 -0800261 pipe = NULL;
262
Ian Kent34ca9592006-03-27 01:14:54 -0800263 root->d_fsdata = ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265 /* Can this call block? */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700266 if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800267 &pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
268 &sbi->max_proto)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 printk("autofs: called with bogus options\n");
270 goto fail_dput;
271 }
272
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800273 if (pgrp_set) {
274 sbi->oz_pgrp = find_get_pid(pgrp);
275 if (!sbi->oz_pgrp) {
276 pr_warn("autofs: could not find process group %d\n",
277 pgrp);
278 goto fail_dput;
279 }
280 } else {
281 sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
282 }
283
David Howellsb650c852011-01-15 10:51:57 +0000284 if (autofs_type_trigger(sbi->type))
Ian Kentb5b80172011-01-14 18:46:03 +0000285 __managed_dentry_set_managed(root);
Ian Kent10584212011-01-14 18:45:58 +0000286
Ian Kent34ca9592006-03-27 01:14:54 -0800287 root_inode->i_fop = &autofs4_root_operations;
Ian Kente61da202011-01-14 18:46:14 +0000288 root_inode->i_op = &autofs4_dir_inode_operations;
Ian Kent34ca9592006-03-27 01:14:54 -0800289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 /* Couldn't this be tested earlier? */
Ian Kentd7c4a5f2006-03-27 01:14:49 -0800291 if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
292 sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 printk("autofs: kernel does not match daemon version "
294 "daemon (%d, %d) kernel (%d, %d)\n",
Ian Kentd7c4a5f2006-03-27 01:14:49 -0800295 sbi->min_proto, sbi->max_proto,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
297 goto fail_dput;
298 }
299
Ian Kentd7c4a5f2006-03-27 01:14:49 -0800300 /* Establish highest kernel protocol version */
301 if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
302 sbi->version = AUTOFS_MAX_PROTO_VERSION;
303 else
304 sbi->version = sbi->max_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
306
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800307 DPRINTK("pipe fd = %d, pgrp = %u", pipefd, pid_nr(sbi->oz_pgrp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 pipe = fget(pipefd);
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800309
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700310 if (!pipe) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 printk("autofs: could not open pipe file descriptor\n");
312 goto fail_dput;
313 }
Rui Xiangda29b752014-01-23 15:54:59 -0800314 ret = autofs_prepare_pipe(pipe);
315 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 goto fail_fput;
317 sbi->pipe = pipe;
Ian Kentd7c4a5f2006-03-27 01:14:49 -0800318 sbi->pipefd = pipefd;
Ian Kentba8df432006-11-14 02:03:29 -0800319 sbi->catatonic = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 * Success! Install the root dentry now to indicate completion.
323 */
324 s->s_root = root;
325 return 0;
326
327 /*
328 * Failure ... clean up.
329 */
330fail_fput:
331 printk("autofs: pipe file descriptor does not contain proper ops\n");
332 fput(pipe);
333 /* fall through */
334fail_dput:
335 dput(root);
336 goto fail_free;
Ian Kent34ca9592006-03-27 01:14:54 -0800337fail_ino:
338 kfree(ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339fail_free:
Sukadev Bhattiprolu6eaba352014-01-23 15:54:57 -0800340 put_pid(sbi->oz_pgrp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 kfree(sbi);
Ian Kentba8df432006-11-14 02:03:29 -0800342 s->s_fs_info = NULL;
Rui Xiangda29b752014-01-23 15:54:59 -0800343 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
Al Viro030a8ba2011-07-26 03:29:03 -0400346struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
348 struct inode *inode = new_inode(sb);
349
350 if (inode == NULL)
351 return NULL;
352
Al Viro09f12c02011-01-16 17:20:23 -0500353 inode->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (sb->s_root) {
355 inode->i_uid = sb->s_root->d_inode->i_uid;
356 inode->i_gid = sb->s_root->d_inode->i_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400359 inode->i_ino = get_next_ino();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Al Viro09f12c02011-01-16 17:20:23 -0500361 if (S_ISDIR(mode)) {
Miklos Szeredibfe86842011-10-28 14:13:29 +0200362 set_nlink(inode, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 inode->i_op = &autofs4_dir_inode_operations;
364 inode->i_fop = &autofs4_dir_operations;
Al Viro09f12c02011-01-16 17:20:23 -0500365 } else if (S_ISLNK(mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 inode->i_op = &autofs4_symlink_inode_operations;
367 }
368
369 return inode;
370}