blob: 431fd7ee348864b01c231f89c3331c6c7c5ccb02 [file] [log] [blame]
Ian Kente9a7c2f2016-03-15 14:58:25 -07001/*
2 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
3 * Copyright 2001-2006 Ian Kent <raven@themaw.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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.
Ian Kente9a7c2f2016-03-15 14:58:25 -07008 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10#include <linux/slab.h>
11#include <linux/time.h>
12#include <linux/signal.h>
13#include <linux/file.h>
14#include "autofs_i.h"
15
16/* We make this a static variable rather than a part of the superblock; it
Ian Kente9a7c2f2016-03-15 14:58:25 -070017 * is better if we don't reassign numbers easily even across filesystems
18 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070019static autofs_wqt_t autofs4_next_wait_queue = 1;
20
21/* These are the signals we allow interrupting a pending mount */
22#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT))
23
24void autofs4_catatonic_mode(struct autofs_sb_info *sbi)
25{
26 struct autofs_wait_queue *wq, *nwq;
27
Ian Kent5a11d4d2008-07-23 21:30:17 -070028 mutex_lock(&sbi->wq_mutex);
29 if (sbi->catatonic) {
30 mutex_unlock(&sbi->wq_mutex);
31 return;
32 }
33
Ian Kent8a78d592016-03-15 14:58:45 -070034 pr_debug("entering catatonic mode\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36 sbi->catatonic = 1;
37 wq = sbi->queues;
38 sbi->queues = NULL; /* Erase all wait queues */
Ian Kente77fbdd2006-03-27 01:14:49 -080039 while (wq) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 nwq = wq->next;
41 wq->status = -ENOENT; /* Magic is gone - report failure */
Tim Gardner5140a8c2013-03-01 19:46:48 +080042 kfree(wq->name.name);
43 wq->name.name = NULL;
Ian Kent296f7bf2008-07-23 21:30:21 -070044 wq->wait_ctr--;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 wake_up_interruptible(&wq->queue);
46 wq = nwq;
47 }
Ian Kentba8df432006-11-14 02:03:29 -080048 fput(sbi->pipe); /* Close the pipe */
49 sbi->pipe = NULL;
Ian Kent5a11d4d2008-07-23 21:30:17 -070050 sbi->pipefd = -1;
51 mutex_unlock(&sbi->wq_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
53
Al Virod668dc52012-01-10 22:35:38 -050054static int autofs4_write(struct autofs_sb_info *sbi,
55 struct file *file, const void *addr, int bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
57 unsigned long sigpipe, flags;
58 mm_segment_t fs;
59 const char *data = (const char *)addr;
60 ssize_t wr = 0;
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 sigpipe = sigismember(&current->pending.signal, SIGPIPE);
63
64 /* Save pointer to user space and point back to kernel space */
65 fs = get_fs();
66 set_fs(KERNEL_DS);
67
Al Virod668dc52012-01-10 22:35:38 -050068 mutex_lock(&sbi->pipe_mutex);
Andrey Vagin5a9294e52016-06-24 14:50:27 -070069 while (bytes) {
70 wr = __vfs_write(file, data, bytes, &file->f_pos);
71 if (wr <= 0)
72 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 data += wr;
74 bytes -= wr;
75 }
Ian Kent86380942012-01-13 20:41:46 +080076 mutex_unlock(&sbi->pipe_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78 set_fs(fs);
79
80 /* Keep the currently executing process from receiving a
Ian Kente9a7c2f2016-03-15 14:58:25 -070081 * SIGPIPE unless it was already supposed to get one
82 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 if (wr == -EPIPE && !sigpipe) {
84 spin_lock_irqsave(&current->sighand->siglock, flags);
85 sigdelset(&current->pending.signal, SIGPIPE);
86 recalc_sigpending();
87 spin_unlock_irqrestore(&current->sighand->siglock, flags);
88 }
89
90 return (bytes > 0);
91}
Ian Kent02667252016-03-15 14:58:36 -070092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
94 struct autofs_wait_queue *wq,
95 int type)
96{
Ian Kente8514472007-02-20 13:58:09 -080097 union {
98 struct autofs_packet_hdr hdr;
99 union autofs_packet_union v4_pkt;
100 union autofs_v5_packet_union v5_pkt;
101 } pkt;
Ian Kente64be332008-07-23 21:30:20 -0700102 struct file *pipe = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 size_t pktsz;
104
Ian Kent8a78d592016-03-15 14:58:45 -0700105 pr_debug("wait id = 0x%08lx, name = %.*s, type=%d\n",
106 (unsigned long) wq->wait_queue_token,
107 wq->name.len, wq->name.name, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Ian Kente9a7c2f2016-03-15 14:58:25 -0700109 memset(&pkt, 0, sizeof(pkt)); /* For security reasons */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 pkt.hdr.proto_version = sbi->version;
112 pkt.hdr.type = type;
Al Viro87533332012-01-10 22:24:48 -0500113
Ian Kent5c0a32f2006-03-27 01:14:55 -0800114 switch (type) {
115 /* Kernel protocol v4 missing and expire packets */
116 case autofs_ptype_missing:
117 {
Ian Kente8514472007-02-20 13:58:09 -0800118 struct autofs_packet_missing *mp = &pkt.v4_pkt.missing;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 pktsz = sizeof(*mp);
121
122 mp->wait_queue_token = wq->wait_queue_token;
Jeff Moyer70b52a02008-07-23 21:30:16 -0700123 mp->len = wq->name.len;
124 memcpy(mp->name, wq->name.name, wq->name.len);
125 mp->name[wq->name.len] = '\0';
Ian Kent5c0a32f2006-03-27 01:14:55 -0800126 break;
127 }
128 case autofs_ptype_expire_multi:
129 {
Ian Kente9a7c2f2016-03-15 14:58:25 -0700130 struct autofs_packet_expire_multi *ep =
131 &pkt.v4_pkt.expire_multi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 pktsz = sizeof(*ep);
134
135 ep->wait_queue_token = wq->wait_queue_token;
Jeff Moyer70b52a02008-07-23 21:30:16 -0700136 ep->len = wq->name.len;
137 memcpy(ep->name, wq->name.name, wq->name.len);
138 ep->name[wq->name.len] = '\0';
Ian Kent5c0a32f2006-03-27 01:14:55 -0800139 break;
140 }
141 /*
142 * Kernel protocol v5 packet for handling indirect and direct
143 * mount missing and expire requests
144 */
145 case autofs_ptype_missing_indirect:
146 case autofs_ptype_expire_indirect:
147 case autofs_ptype_missing_direct:
148 case autofs_ptype_expire_direct:
149 {
Ian Kente8514472007-02-20 13:58:09 -0800150 struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet;
Eric W. Biederman45634cd2012-02-07 16:18:52 -0800151 struct user_namespace *user_ns = sbi->pipe->f_cred->user_ns;
Ian Kent5c0a32f2006-03-27 01:14:55 -0800152
Linus Torvaldsfcbf94b2012-04-28 08:29:56 -0700153 pktsz = sizeof(*packet);
154
Ian Kent5c0a32f2006-03-27 01:14:55 -0800155 packet->wait_queue_token = wq->wait_queue_token;
Jeff Moyer70b52a02008-07-23 21:30:16 -0700156 packet->len = wq->name.len;
157 memcpy(packet->name, wq->name.name, wq->name.len);
158 packet->name[wq->name.len] = '\0';
Ian Kent5c0a32f2006-03-27 01:14:55 -0800159 packet->dev = wq->dev;
160 packet->ino = wq->ino;
Eric W. Biederman45634cd2012-02-07 16:18:52 -0800161 packet->uid = from_kuid_munged(user_ns, wq->uid);
162 packet->gid = from_kgid_munged(user_ns, wq->gid);
Ian Kent5c0a32f2006-03-27 01:14:55 -0800163 packet->pid = wq->pid;
164 packet->tgid = wq->tgid;
165 break;
166 }
167 default:
Ian Kent8a78d592016-03-15 14:58:45 -0700168 pr_warn("bad type %d!\n", type);
Al Viro87533332012-01-10 22:24:48 -0500169 mutex_unlock(&sbi->wq_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return;
171 }
172
Al Virocb0942b2012-08-27 14:48:26 -0400173 pipe = get_file(sbi->pipe);
Al Viro87533332012-01-10 22:24:48 -0500174
Ian Kente64be332008-07-23 21:30:20 -0700175 mutex_unlock(&sbi->wq_mutex);
176
Al Virod668dc52012-01-10 22:35:38 -0500177 if (autofs4_write(sbi, pipe, &pkt, pktsz))
Al Viro87533332012-01-10 22:24:48 -0500178 autofs4_catatonic_mode(sbi);
179 fput(pipe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180}
181
182static int autofs4_getpath(struct autofs_sb_info *sbi,
183 struct dentry *dentry, char **name)
184{
185 struct dentry *root = sbi->sb->s_root;
186 struct dentry *tmp;
Nick Piggin949854d2011-01-07 17:49:37 +1100187 char *buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 char *p;
Nick Piggin949854d2011-01-07 17:49:37 +1100189 int len;
190 unsigned seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Nick Piggin949854d2011-01-07 17:49:37 +1100192rename_retry:
193 buf = *name;
194 len = 0;
Nick Pigginb5c84bf2011-01-07 17:49:38 +1100195
Nick Piggin949854d2011-01-07 17:49:37 +1100196 seq = read_seqbegin(&rename_lock);
197 rcu_read_lock();
Ian Kente7854722011-03-25 01:51:31 +0800198 spin_lock(&sbi->fs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
200 len += tmp->d_name.len + 1;
201
Ian Kentcab09362008-05-01 04:35:07 -0700202 if (!len || --len > NAME_MAX) {
Ian Kente7854722011-03-25 01:51:31 +0800203 spin_unlock(&sbi->fs_lock);
Nick Piggin949854d2011-01-07 17:49:37 +1100204 rcu_read_unlock();
205 if (read_seqretry(&rename_lock, seq))
206 goto rename_retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 return 0;
208 }
209
210 *(buf + len) = '\0';
211 p = buf + len - dentry->d_name.len;
212 strncpy(p, dentry->d_name.name, dentry->d_name.len);
213
214 for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) {
215 *(--p) = '/';
216 p -= tmp->d_name.len;
217 strncpy(p, tmp->d_name.name, tmp->d_name.len);
218 }
Ian Kente7854722011-03-25 01:51:31 +0800219 spin_unlock(&sbi->fs_lock);
Nick Piggin949854d2011-01-07 17:49:37 +1100220 rcu_read_unlock();
221 if (read_seqretry(&rename_lock, seq))
222 goto rename_retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 return len;
225}
226
Ian Kenta5370552006-05-15 09:43:51 -0700227static struct autofs_wait_queue *
Al Viro8ac790f2016-07-20 16:25:07 -0400228autofs4_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr)
Ian Kenta5370552006-05-15 09:43:51 -0700229{
230 struct autofs_wait_queue *wq;
231
232 for (wq = sbi->queues; wq; wq = wq->next) {
Jeff Moyer70b52a02008-07-23 21:30:16 -0700233 if (wq->name.hash == qstr->hash &&
234 wq->name.len == qstr->len &&
235 wq->name.name &&
Ian Kente9a7c2f2016-03-15 14:58:25 -0700236 !memcmp(wq->name.name, qstr->name, qstr->len))
Ian Kenta5370552006-05-15 09:43:51 -0700237 break;
238 }
239 return wq;
240}
241
Ian Kenta1362fe2008-07-23 21:30:19 -0700242/*
243 * Check if we have a valid request.
244 * Returns
245 * 1 if the request should continue.
246 * In this case we can return an autofs_wait_queue entry if one is
247 * found or NULL to idicate a new wait needs to be created.
248 * 0 or a negative errno if the request shouldn't continue.
249 */
250static int validate_request(struct autofs_wait_queue **wait,
251 struct autofs_sb_info *sbi,
Al Viro8ac790f2016-07-20 16:25:07 -0400252 const struct qstr *qstr,
Ian Kente9a7c2f2016-03-15 14:58:25 -0700253 struct dentry *dentry, enum autofs_notify notify)
Ian Kenta1362fe2008-07-23 21:30:19 -0700254{
255 struct autofs_wait_queue *wq;
256 struct autofs_info *ino;
257
Al Viro4041bcd2012-01-10 22:20:12 -0500258 if (sbi->catatonic)
259 return -ENOENT;
260
Ian Kenta1362fe2008-07-23 21:30:19 -0700261 /* Wait in progress, continue; */
262 wq = autofs4_find_wait(sbi, qstr);
263 if (wq) {
264 *wait = wq;
265 return 1;
266 }
267
268 *wait = NULL;
269
270 /* If we don't yet have any info this is a new request */
271 ino = autofs4_dentry_ino(dentry);
272 if (!ino)
273 return 1;
274
275 /*
276 * If we've been asked to wait on an existing expire (NFY_NONE)
277 * but there is no wait in the queue ...
278 */
279 if (notify == NFY_NONE) {
280 /*
281 * Either we've betean the pending expire to post it's
282 * wait or it finished while we waited on the mutex.
283 * So we need to wait till either, the wait appears
284 * or the expire finishes.
285 */
286
287 while (ino->flags & AUTOFS_INF_EXPIRING) {
288 mutex_unlock(&sbi->wq_mutex);
289 schedule_timeout_interruptible(HZ/10);
290 if (mutex_lock_interruptible(&sbi->wq_mutex))
291 return -EINTR;
292
Al Viro4041bcd2012-01-10 22:20:12 -0500293 if (sbi->catatonic)
294 return -ENOENT;
295
Ian Kenta1362fe2008-07-23 21:30:19 -0700296 wq = autofs4_find_wait(sbi, qstr);
297 if (wq) {
298 *wait = wq;
299 return 1;
300 }
301 }
302
303 /*
304 * Not ideal but the status has already gone. Of the two
305 * cases where we wait on NFY_NONE neither depend on the
306 * return status of the wait.
307 */
308 return 0;
309 }
310
311 /*
312 * If we've been asked to trigger a mount and the request
313 * completed while we waited on the mutex ...
314 */
315 if (notify == NFY_MOUNT) {
Ian Kent9e3fea12011-01-14 18:46:30 +0000316 struct dentry *new = NULL;
317 int valid = 1;
318
Ian Kenta1362fe2008-07-23 21:30:19 -0700319 /*
Ian Kent463aea12009-06-09 16:26:24 -0700320 * If the dentry was successfully mounted while we slept
321 * on the wait queue mutex we can return success. If it
322 * isn't mounted (doesn't have submounts for the case of
323 * a multi-mount with no mount at it's base) we can
324 * continue on and create a new request.
325 */
Ian Kent9e3fea12011-01-14 18:46:30 +0000326 if (!IS_ROOT(dentry)) {
Ian Kente9a7c2f2016-03-15 14:58:25 -0700327 if (d_unhashed(dentry) &&
328 d_really_is_positive(dentry)) {
Ian Kent9e3fea12011-01-14 18:46:30 +0000329 struct dentry *parent = dentry->d_parent;
Ian Kente9a7c2f2016-03-15 14:58:25 -0700330
Ian Kent9e3fea12011-01-14 18:46:30 +0000331 new = d_lookup(parent, &dentry->d_name);
332 if (new)
333 dentry = new;
334 }
335 }
Ian Kent463aea12009-06-09 16:26:24 -0700336 if (have_submounts(dentry))
Ian Kent9e3fea12011-01-14 18:46:30 +0000337 valid = 0;
338
339 if (new)
340 dput(new);
341 return valid;
Ian Kenta1362fe2008-07-23 21:30:19 -0700342 }
343
344 return 1;
345}
346
Ian Kente9a7c2f2016-03-15 14:58:25 -0700347int autofs4_wait(struct autofs_sb_info *sbi,
348 struct dentry *dentry, enum autofs_notify notify)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
350 struct autofs_wait_queue *wq;
Jeff Moyer70b52a02008-07-23 21:30:16 -0700351 struct qstr qstr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 char *name;
Ian Kenta1362fe2008-07-23 21:30:19 -0700353 int status, ret, type;
Miklos Szeredifbff0872014-01-23 15:54:58 -0800354 pid_t pid;
355 pid_t tgid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
357 /* In catatonic mode, we don't wait for nobody */
Ian Kente77fbdd2006-03-27 01:14:49 -0800358 if (sbi->catatonic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 return -ENOENT;
Ian Kenta1362fe2008-07-23 21:30:19 -0700360
Miklos Szeredifbff0872014-01-23 15:54:58 -0800361 /*
362 * Try translating pids to the namespace of the daemon.
363 *
364 * Zero means failure: we are in an unrelated pid namespace.
365 */
366 pid = task_pid_nr_ns(current, ns_of_pid(sbi->oz_pgrp));
367 tgid = task_tgid_nr_ns(current, ns_of_pid(sbi->oz_pgrp));
368 if (pid == 0 || tgid == 0)
369 return -ENOENT;
370
David Howells2b0143b2015-03-17 22:25:59 +0000371 if (d_really_is_negative(dentry)) {
Ian Kentc72305b2008-07-23 21:30:23 -0700372 /*
373 * A wait for a negative dentry is invalid for certain
374 * cases. A direct or offset mount "always" has its mount
375 * point directory created and so the request dentry must
376 * be positive or the map key doesn't exist. The situation
377 * is very similar for indirect mounts except only dentrys
378 * in the root of the autofs file system may be negative.
379 */
Ian Kenta92daf62009-01-06 14:42:08 -0800380 if (autofs_type_trigger(sbi->type))
Ian Kentc72305b2008-07-23 21:30:23 -0700381 return -ENOENT;
382 else if (!IS_ROOT(dentry->d_parent))
383 return -ENOENT;
384 }
Ian Kenteb3b1762008-07-23 21:30:22 -0700385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 name = kmalloc(NAME_MAX + 1, GFP_KERNEL);
387 if (!name)
388 return -ENOMEM;
389
Ian Kent5c0a32f2006-03-27 01:14:55 -0800390 /* If this is a direct mount request create a dummy name */
Ian Kenta92daf62009-01-06 14:42:08 -0800391 if (IS_ROOT(dentry) && autofs_type_trigger(sbi->type))
Jeff Moyer70b52a02008-07-23 21:30:16 -0700392 qstr.len = sprintf(name, "%p", dentry);
Ian Kent5c0a32f2006-03-27 01:14:55 -0800393 else {
Jeff Moyer70b52a02008-07-23 21:30:16 -0700394 qstr.len = autofs4_getpath(sbi, dentry, &name);
395 if (!qstr.len) {
Ian Kent5c0a32f2006-03-27 01:14:55 -0800396 kfree(name);
397 return -ENOENT;
398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
Jeff Moyer70b52a02008-07-23 21:30:16 -0700400 qstr.name = name;
Linus Torvalds8387ff22016-06-10 07:51:30 -0700401 qstr.hash = full_name_hash(dentry, name, qstr.len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Ian Kentf4c7da02008-07-23 21:30:19 -0700403 if (mutex_lock_interruptible(&sbi->wq_mutex)) {
404 kfree(qstr.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 return -EINTR;
Ian Kentf4c7da02008-07-23 21:30:19 -0700406 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Ian Kenta1362fe2008-07-23 21:30:19 -0700408 ret = validate_request(&wq, sbi, &qstr, dentry, notify);
409 if (ret <= 0) {
Al Viro4041bcd2012-01-10 22:20:12 -0500410 if (ret != -EINTR)
Ian Kenta5370552006-05-15 09:43:51 -0700411 mutex_unlock(&sbi->wq_mutex);
Ian Kenta1362fe2008-07-23 21:30:19 -0700412 kfree(qstr.name);
413 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 }
415
Ian Kente77fbdd2006-03-27 01:14:49 -0800416 if (!wq) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 /* Create a new wait queue */
Ian Kente9a7c2f2016-03-15 14:58:25 -0700418 wq = kmalloc(sizeof(struct autofs_wait_queue), GFP_KERNEL);
Ian Kente77fbdd2006-03-27 01:14:49 -0800419 if (!wq) {
Jeff Moyer70b52a02008-07-23 21:30:16 -0700420 kfree(qstr.name);
Ingo Molnar1d5599e2006-03-23 03:00:41 -0800421 mutex_unlock(&sbi->wq_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 return -ENOMEM;
423 }
424
425 wq->wait_queue_token = autofs4_next_wait_queue;
426 if (++autofs4_next_wait_queue == 0)
427 autofs4_next_wait_queue = 1;
428 wq->next = sbi->queues;
429 sbi->queues = wq;
430 init_waitqueue_head(&wq->queue);
Jeff Moyer70b52a02008-07-23 21:30:16 -0700431 memcpy(&wq->name, &qstr, sizeof(struct qstr));
Ian Kent5c0a32f2006-03-27 01:14:55 -0800432 wq->dev = autofs4_get_dev(sbi);
433 wq->ino = autofs4_get_ino(sbi);
David Howells0eb790e2008-11-14 10:38:46 +1100434 wq->uid = current_uid();
435 wq->gid = current_gid();
Miklos Szeredifbff0872014-01-23 15:54:58 -0800436 wq->pid = pid;
437 wq->tgid = tgid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 wq->status = -EINTR; /* Status return if interrupted */
Ian Kent296f7bf2008-07-23 21:30:21 -0700439 wq->wait_ctr = 2;
Ian Kent3e7b1912006-03-27 01:14:59 -0800440
Ian Kent5c0a32f2006-03-27 01:14:55 -0800441 if (sbi->version < 5) {
442 if (notify == NFY_MOUNT)
443 type = autofs_ptype_missing;
444 else
445 type = autofs_ptype_expire_multi;
446 } else {
447 if (notify == NFY_MOUNT)
Ian Kenta92daf62009-01-06 14:42:08 -0800448 type = autofs_type_trigger(sbi->type) ?
Ian Kent5c0a32f2006-03-27 01:14:55 -0800449 autofs_ptype_missing_direct :
450 autofs_ptype_missing_indirect;
451 else
Ian Kenta92daf62009-01-06 14:42:08 -0800452 type = autofs_type_trigger(sbi->type) ?
Ian Kent5c0a32f2006-03-27 01:14:55 -0800453 autofs_ptype_expire_direct :
454 autofs_ptype_expire_indirect;
455 }
Ian Kent4dcd00b2005-05-01 08:59:16 -0700456
Ian Kent8a78d592016-03-15 14:58:45 -0700457 pr_debug("new wait id = 0x%08lx, name = %.*s, nfy=%d\n",
458 (unsigned long) wq->wait_queue_token, wq->name.len,
459 wq->name.name, notify);
Ian Kent4dcd00b2005-05-01 08:59:16 -0700460
Ian Kente9a7c2f2016-03-15 14:58:25 -0700461 /*
462 * autofs4_notify_daemon() may block; it will unlock ->wq_mutex
463 */
Ian Kent4dcd00b2005-05-01 08:59:16 -0700464 autofs4_notify_daemon(sbi, wq, type);
Ian Kenta5370552006-05-15 09:43:51 -0700465 } else {
Ian Kent296f7bf2008-07-23 21:30:21 -0700466 wq->wait_ctr++;
Ian Kent8a78d592016-03-15 14:58:45 -0700467 pr_debug("existing wait id = 0x%08lx, name = %.*s, nfy=%d\n",
468 (unsigned long) wq->wait_queue_token, wq->name.len,
469 wq->name.name, notify);
Al Viro606035e2013-09-14 17:32:12 -0400470 mutex_unlock(&sbi->wq_mutex);
471 kfree(qstr.name);
Ian Kent4dcd00b2005-05-01 08:59:16 -0700472 }
473
Ian Kent5a11d4d2008-07-23 21:30:17 -0700474 /*
475 * wq->name.name is NULL iff the lock is already released
476 * or the mount has been made catatonic.
477 */
Jeff Moyer70b52a02008-07-23 21:30:16 -0700478 if (wq->name.name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 /* Block all but "shutdown" signals while waiting */
Ian Kentb3f67a92016-03-15 14:58:30 -0700480 unsigned long shutdown_sigs_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 unsigned long irqflags;
Ian Kentb3f67a92016-03-15 14:58:30 -0700482 sigset_t oldset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 spin_lock_irqsave(&current->sighand->siglock, irqflags);
485 oldset = current->blocked;
Ian Kentb3f67a92016-03-15 14:58:30 -0700486 shutdown_sigs_mask = SHUTDOWN_SIGS & ~oldset.sig[0];
487 siginitsetinv(&current->blocked, shutdown_sigs_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 recalc_sigpending();
489 spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
490
Jeff Moyer70b52a02008-07-23 21:30:16 -0700491 wait_event_interruptible(wq->queue, wq->name.name == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
493 spin_lock_irqsave(&current->sighand->siglock, irqflags);
494 current->blocked = oldset;
495 recalc_sigpending();
496 spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
497 } else {
Ian Kent8a78d592016-03-15 14:58:45 -0700498 pr_debug("skipped sleeping\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 }
500
501 status = wq->status;
502
Ian Kentc0f54d32008-10-15 22:02:52 -0700503 /*
504 * For direct and offset mounts we need to track the requester's
505 * uid and gid in the dentry info struct. This is so it can be
506 * supplied, on request, by the misc device ioctl interface.
507 * This is needed during daemon resatart when reconnecting
508 * to existing, active, autofs mounts. The uid and gid (and
509 * related string values) may be used for macro substitution
510 * in autofs mount maps.
511 */
512 if (!status) {
513 struct autofs_info *ino;
514 struct dentry *de = NULL;
515
516 /* direct mount or browsable map */
517 ino = autofs4_dentry_ino(dentry);
518 if (!ino) {
519 /* If not lookup actual dentry used */
520 de = d_lookup(dentry->d_parent, &dentry->d_name);
521 if (de)
522 ino = autofs4_dentry_ino(de);
523 }
524
525 /* Set mount requester */
526 if (ino) {
527 spin_lock(&sbi->fs_lock);
528 ino->uid = wq->uid;
529 ino->gid = wq->gid;
530 spin_unlock(&sbi->fs_lock);
531 }
532
533 if (de)
534 dput(de);
535 }
536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 /* Are we the last process to need status? */
Ian Kent296f7bf2008-07-23 21:30:21 -0700538 mutex_lock(&sbi->wq_mutex);
539 if (!--wq->wait_ctr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 kfree(wq);
Ian Kent296f7bf2008-07-23 21:30:21 -0700541 mutex_unlock(&sbi->wq_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 return status;
544}
545
546
547int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status)
548{
549 struct autofs_wait_queue *wq, **wql;
550
Ingo Molnar1d5599e2006-03-23 03:00:41 -0800551 mutex_lock(&sbi->wq_mutex);
Stephen Hemmingerc80544d2007-10-18 03:07:05 -0700552 for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {
Ian Kente77fbdd2006-03-27 01:14:49 -0800553 if (wq->wait_queue_token == wait_queue_token)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 break;
555 }
556
Ian Kente77fbdd2006-03-27 01:14:49 -0800557 if (!wq) {
Ingo Molnar1d5599e2006-03-23 03:00:41 -0800558 mutex_unlock(&sbi->wq_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 return -EINVAL;
560 }
561
562 *wql = wq->next; /* Unlink from chain */
Jeff Moyer70b52a02008-07-23 21:30:16 -0700563 kfree(wq->name.name);
564 wq->name.name = NULL; /* Do not wait on this queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 wq->status = status;
Ian Kent296f7bf2008-07-23 21:30:21 -0700566 wake_up_interruptible(&wq->queue);
567 if (!--wq->wait_ctr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 kfree(wq);
Ian Kent296f7bf2008-07-23 21:30:21 -0700569 mutex_unlock(&sbi->wq_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571 return 0;
572}