blob: cdb25ebccc4c49c2ac2f4a4c17d998ae99f14941 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* -*- c -*- --------------------------------------------------------------- *
2 *
3 * linux/fs/autofs/root.c
4 *
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
6 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
Ian Kent34ca9592006-03-27 01:14:54 -08007 * Copyright 2001-2006 Ian Kent <raven@themaw.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * This file is part of the Linux kernel and is made available under
10 * the terms of the GNU General Public License, version 2, or at your
11 * option, any later version, incorporated herein by reference.
12 *
13 * ------------------------------------------------------------------------- */
14
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080015#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/errno.h>
17#include <linux/stat.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/param.h>
20#include <linux/time.h>
Arnd Bergmannc9243f52010-07-04 00:15:07 +020021#include <linux/compat.h>
Arnd Bergmann00e300e2010-09-14 23:00:34 +020022#include <linux/mutex.h>
Arnd Bergmannc9243f52010-07-04 00:15:07 +020023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "autofs_i.h"
25
26static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *);
27static int autofs4_dir_unlink(struct inode *,struct dentry *);
28static int autofs4_dir_rmdir(struct inode *,struct dentry *);
Al Viro18bb1db2011-07-26 01:41:39 -040029static int autofs4_dir_mkdir(struct inode *,struct dentry *,umode_t);
Frederic Weisbecker3663df72010-05-19 15:08:17 +020030static long autofs4_root_ioctl(struct file *,unsigned int,unsigned long);
Felipe Contreras5a44a732010-09-24 15:22:23 +020031#ifdef CONFIG_COMPAT
Arnd Bergmannc9243f52010-07-04 00:15:07 +020032static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long);
Felipe Contreras5a44a732010-09-24 15:22:23 +020033#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static int autofs4_dir_open(struct inode *inode, struct file *file);
Al Viro00cd8dd2012-06-10 17:13:09 -040035static struct dentry *autofs4_lookup(struct inode *,struct dentry *, unsigned int);
Ian Kent71e469d2011-01-14 18:46:19 +000036static struct vfsmount *autofs4_d_automount(struct path *);
Al Viro1aed3e42011-03-18 09:09:02 -040037static int autofs4_d_manage(struct dentry *, bool);
Al Virob89b12b2011-01-16 21:42:32 -050038static void autofs4_dentry_release(struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080040const struct file_operations autofs4_root_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 .open = dcache_dir_open,
42 .release = dcache_dir_close,
43 .read = generic_read_dir,
Al Viro5f99f4e2013-05-15 20:23:06 -040044 .iterate = dcache_readdir,
Al Viro59af1582008-08-24 07:24:41 -040045 .llseek = dcache_dir_lseek,
Frederic Weisbecker3663df72010-05-19 15:08:17 +020046 .unlocked_ioctl = autofs4_root_ioctl,
Arnd Bergmannc9243f52010-07-04 00:15:07 +020047#ifdef CONFIG_COMPAT
48 .compat_ioctl = autofs4_root_compat_ioctl,
49#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070050};
51
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080052const struct file_operations autofs4_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 .open = autofs4_dir_open,
Ian Kentff9cd492008-07-23 21:30:24 -070054 .release = dcache_dir_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 .read = generic_read_dir,
Al Viro5f99f4e2013-05-15 20:23:06 -040056 .iterate = dcache_readdir,
Al Viro59af1582008-08-24 07:24:41 -040057 .llseek = dcache_dir_lseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070058};
59
Arjan van de Ven754661f2007-02-12 00:55:38 -080060const struct inode_operations autofs4_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 .lookup = autofs4_lookup,
62 .unlink = autofs4_dir_unlink,
63 .symlink = autofs4_dir_symlink,
64 .mkdir = autofs4_dir_mkdir,
65 .rmdir = autofs4_dir_rmdir,
66};
67
Ian Kent71e469d2011-01-14 18:46:19 +000068const struct dentry_operations autofs4_dentry_operations = {
Ian Kent71e469d2011-01-14 18:46:19 +000069 .d_automount = autofs4_d_automount,
70 .d_manage = autofs4_d_manage,
71 .d_release = autofs4_dentry_release,
72};
73
Ian Kent4f8427d2009-12-15 16:45:42 -080074static void autofs4_add_active(struct dentry *dentry)
75{
76 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
77 struct autofs_info *ino = autofs4_dentry_ino(dentry);
78 if (ino) {
79 spin_lock(&sbi->lookup_lock);
80 if (!ino->active_count) {
81 if (list_empty(&ino->active))
82 list_add(&ino->active, &sbi->active_list);
83 }
84 ino->active_count++;
85 spin_unlock(&sbi->lookup_lock);
86 }
87 return;
88}
89
90static void autofs4_del_active(struct dentry *dentry)
91{
92 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
93 struct autofs_info *ino = autofs4_dentry_ino(dentry);
94 if (ino) {
95 spin_lock(&sbi->lookup_lock);
96 ino->active_count--;
97 if (!ino->active_count) {
98 if (!list_empty(&ino->active))
99 list_del_init(&ino->active);
100 }
101 spin_unlock(&sbi->lookup_lock);
102 }
103 return;
104}
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106static int autofs4_dir_open(struct inode *inode, struct file *file)
107{
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800108 struct dentry *dentry = file->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
Ian Kentf360ce32006-03-27 01:14:43 -0800110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 DPRINTK("file=%p dentry=%p %.*s",
112 file, dentry, dentry->d_name.len, dentry->d_name.name);
113
114 if (autofs4_oz_mode(sbi))
115 goto out;
116
Ian Kentff9cd492008-07-23 21:30:24 -0700117 /*
118 * An empty directory in an autofs file system is always a
119 * mount point. The daemon must have failed to mount this
120 * during lookup so it doesn't exist. This can happen, for
121 * example, if user space returns an incorrect status for a
122 * mount request. Otherwise we're doing a readdir on the
123 * autofs file system so just let the libfs routines handle
124 * it.
125 */
Ian Kente7854722011-03-25 01:51:31 +0800126 spin_lock(&sbi->lookup_lock);
Ian Kent0259cb02012-12-14 10:23:29 +0800127 if (!d_mountpoint(dentry) && simple_empty(dentry)) {
Ian Kente7854722011-03-25 01:51:31 +0800128 spin_unlock(&sbi->lookup_lock);
Ian Kentff9cd492008-07-23 21:30:24 -0700129 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 }
Ian Kente7854722011-03-25 01:51:31 +0800131 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Ian Kentf360ce32006-03-27 01:14:43 -0800133out:
Ian Kentff9cd492008-07-23 21:30:24 -0700134 return dcache_dir_open(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
Al Virob89b12b2011-01-16 21:42:32 -0500137static void autofs4_dentry_release(struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
Al Virob89b12b2011-01-16 21:42:32 -0500139 struct autofs_info *ino = autofs4_dentry_ino(de);
140 struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 DPRINTK("releasing %p", de);
143
Al Virob89b12b2011-01-16 21:42:32 -0500144 if (!ino)
145 return;
146
147 if (sbi) {
148 spin_lock(&sbi->lookup_lock);
149 if (!list_empty(&ino->active))
150 list_del(&ino->active);
151 if (!list_empty(&ino->expiring))
152 list_del(&ino->expiring);
153 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
Al Virob89b12b2011-01-16 21:42:32 -0500155
156 autofs4_free_ino(ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
Ian Kent6510c9d2009-12-15 16:45:47 -0800159static struct dentry *autofs4_lookup_active(struct dentry *dentry)
Ian Kent25767372008-07-23 21:30:12 -0700160{
Ian Kent6510c9d2009-12-15 16:45:47 -0800161 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
162 struct dentry *parent = dentry->d_parent;
163 struct qstr *name = &dentry->d_name;
Ian Kent25767372008-07-23 21:30:12 -0700164 unsigned int len = name->len;
165 unsigned int hash = name->hash;
166 const unsigned char *str = name->name;
167 struct list_head *p, *head;
168
Ian Kent25767372008-07-23 21:30:12 -0700169 head = &sbi->active_list;
NeilBrown668128e2014-08-08 14:19:54 -0700170 if (list_empty(head))
171 return NULL;
172 spin_lock(&sbi->lookup_lock);
Ian Kent25767372008-07-23 21:30:12 -0700173 list_for_each(p, head) {
174 struct autofs_info *ino;
Ian Kente4d5ade2009-12-15 16:45:49 -0800175 struct dentry *active;
Ian Kent25767372008-07-23 21:30:12 -0700176 struct qstr *qstr;
177
178 ino = list_entry(p, struct autofs_info, active);
Ian Kente4d5ade2009-12-15 16:45:49 -0800179 active = ino->dentry;
Ian Kent25767372008-07-23 21:30:12 -0700180
Ian Kente4d5ade2009-12-15 16:45:49 -0800181 spin_lock(&active->d_lock);
Ian Kent25767372008-07-23 21:30:12 -0700182
183 /* Already gone? */
Ian Kent6b6751f2014-05-06 12:50:06 -0700184 if ((int) d_count(active) <= 0)
Ian Kent25767372008-07-23 21:30:12 -0700185 goto next;
186
Ian Kente4d5ade2009-12-15 16:45:49 -0800187 qstr = &active->d_name;
Ian Kent25767372008-07-23 21:30:12 -0700188
Ian Kente4d5ade2009-12-15 16:45:49 -0800189 if (active->d_name.hash != hash)
Ian Kent25767372008-07-23 21:30:12 -0700190 goto next;
Ian Kente4d5ade2009-12-15 16:45:49 -0800191 if (active->d_parent != parent)
Ian Kent25767372008-07-23 21:30:12 -0700192 goto next;
193
194 if (qstr->len != len)
195 goto next;
196 if (memcmp(qstr->name, str, len))
197 goto next;
198
Al Viro4b1ae272010-03-03 12:58:31 -0500199 if (d_unhashed(active)) {
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100200 dget_dlock(active);
Al Viro4b1ae272010-03-03 12:58:31 -0500201 spin_unlock(&active->d_lock);
202 spin_unlock(&sbi->lookup_lock);
Al Viro4b1ae272010-03-03 12:58:31 -0500203 return active;
204 }
Ian Kent25767372008-07-23 21:30:12 -0700205next:
Ian Kente4d5ade2009-12-15 16:45:49 -0800206 spin_unlock(&active->d_lock);
Ian Kent25767372008-07-23 21:30:12 -0700207 }
208 spin_unlock(&sbi->lookup_lock);
Ian Kent25767372008-07-23 21:30:12 -0700209
210 return NULL;
211}
212
Ian Kent6510c9d2009-12-15 16:45:47 -0800213static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
Ian Kentf50b6f82007-02-20 13:58:10 -0800214{
Ian Kent6510c9d2009-12-15 16:45:47 -0800215 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
216 struct dentry *parent = dentry->d_parent;
217 struct qstr *name = &dentry->d_name;
Ian Kentf50b6f82007-02-20 13:58:10 -0800218 unsigned int len = name->len;
219 unsigned int hash = name->hash;
220 const unsigned char *str = name->name;
221 struct list_head *p, *head;
222
Ian Kent5f6f4f22008-07-23 21:30:09 -0700223 head = &sbi->expiring_list;
NeilBrown668128e2014-08-08 14:19:54 -0700224 if (list_empty(head))
225 return NULL;
226 spin_lock(&sbi->lookup_lock);
Ian Kentf50b6f82007-02-20 13:58:10 -0800227 list_for_each(p, head) {
228 struct autofs_info *ino;
Ian Kentcb4b4922009-12-15 16:45:50 -0800229 struct dentry *expiring;
Ian Kentf50b6f82007-02-20 13:58:10 -0800230 struct qstr *qstr;
231
Ian Kent5f6f4f22008-07-23 21:30:09 -0700232 ino = list_entry(p, struct autofs_info, expiring);
Ian Kentcb4b4922009-12-15 16:45:50 -0800233 expiring = ino->dentry;
Ian Kentf50b6f82007-02-20 13:58:10 -0800234
Ian Kentcb4b4922009-12-15 16:45:50 -0800235 spin_lock(&expiring->d_lock);
Ian Kentf50b6f82007-02-20 13:58:10 -0800236
Ian Kent6b6751f2014-05-06 12:50:06 -0700237 /* We've already been dentry_iput or unlinked */
Ian Kentcb4b4922009-12-15 16:45:50 -0800238 if (!expiring->d_inode)
Ian Kentf50b6f82007-02-20 13:58:10 -0800239 goto next;
240
Ian Kentcb4b4922009-12-15 16:45:50 -0800241 qstr = &expiring->d_name;
Ian Kentf50b6f82007-02-20 13:58:10 -0800242
Ian Kentcb4b4922009-12-15 16:45:50 -0800243 if (expiring->d_name.hash != hash)
Ian Kentf50b6f82007-02-20 13:58:10 -0800244 goto next;
Ian Kentcb4b4922009-12-15 16:45:50 -0800245 if (expiring->d_parent != parent)
Ian Kentf50b6f82007-02-20 13:58:10 -0800246 goto next;
247
248 if (qstr->len != len)
249 goto next;
250 if (memcmp(qstr->name, str, len))
251 goto next;
252
Al Viro4b1ae272010-03-03 12:58:31 -0500253 if (d_unhashed(expiring)) {
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100254 dget_dlock(expiring);
Al Viro4b1ae272010-03-03 12:58:31 -0500255 spin_unlock(&expiring->d_lock);
256 spin_unlock(&sbi->lookup_lock);
Al Viro4b1ae272010-03-03 12:58:31 -0500257 return expiring;
258 }
Ian Kentf50b6f82007-02-20 13:58:10 -0800259next:
Ian Kentcb4b4922009-12-15 16:45:50 -0800260 spin_unlock(&expiring->d_lock);
Ian Kentf50b6f82007-02-20 13:58:10 -0800261 }
Ian Kent5f6f4f22008-07-23 21:30:09 -0700262 spin_unlock(&sbi->lookup_lock);
Ian Kentf50b6f82007-02-20 13:58:10 -0800263
264 return NULL;
265}
266
Ian Kent10584212011-01-14 18:45:58 +0000267static int autofs4_mount_wait(struct dentry *dentry)
268{
269 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
270 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent3c319982011-03-25 01:51:08 +0800271 int status = 0;
Ian Kent10584212011-01-14 18:45:58 +0000272
273 if (ino->flags & AUTOFS_INF_PENDING) {
274 DPRINTK("waiting for mount name=%.*s",
275 dentry->d_name.len, dentry->d_name.name);
276 status = autofs4_wait(sbi, dentry, NFY_MOUNT);
277 DPRINTK("mount wait done status=%d", status);
Ian Kent10584212011-01-14 18:45:58 +0000278 }
Ian Kent3c319982011-03-25 01:51:08 +0800279 ino->last_used = jiffies;
280 return status;
Ian Kent10584212011-01-14 18:45:58 +0000281}
282
283static int do_expire_wait(struct dentry *dentry)
284{
285 struct dentry *expiring;
286
287 expiring = autofs4_lookup_expiring(dentry);
288 if (!expiring)
289 return autofs4_expire_wait(dentry);
290 else {
291 /*
292 * If we are racing with expire the request might not
293 * be quite complete, but the directory has been removed
294 * so it must have been successful, just wait for it.
295 */
296 autofs4_expire_wait(expiring);
297 autofs4_del_expiring(expiring);
298 dput(expiring);
299 }
300 return 0;
301}
302
303static struct dentry *autofs4_mountpoint_changed(struct path *path)
304{
305 struct dentry *dentry = path->dentry;
306 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
307
308 /*
309 * If this is an indirect mount the dentry could have gone away
310 * as a result of an expire and a new one created.
311 */
312 if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
313 struct dentry *parent = dentry->d_parent;
Ian Kent3c319982011-03-25 01:51:08 +0800314 struct autofs_info *ino;
Ian Kent10584212011-01-14 18:45:58 +0000315 struct dentry *new = d_lookup(parent, &dentry->d_name);
316 if (!new)
317 return NULL;
Ian Kent3c319982011-03-25 01:51:08 +0800318 ino = autofs4_dentry_ino(new);
319 ino->last_used = jiffies;
Ian Kent10584212011-01-14 18:45:58 +0000320 dput(path->dentry);
321 path->dentry = new;
322 }
323 return path->dentry;
324}
325
Ian Kent71e469d2011-01-14 18:46:19 +0000326static struct vfsmount *autofs4_d_automount(struct path *path)
Ian Kent10584212011-01-14 18:45:58 +0000327{
328 struct dentry *dentry = path->dentry;
329 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
330 struct autofs_info *ino = autofs4_dentry_ino(dentry);
331 int status;
332
333 DPRINTK("dentry=%p %.*s",
334 dentry, dentry->d_name.len, dentry->d_name.name);
335
336 /* The daemon never triggers a mount. */
337 if (autofs4_oz_mode(sbi))
338 return NULL;
339
340 /*
341 * If an expire request is pending everyone must wait.
342 * If the expire fails we're still mounted so continue
343 * the follow and return. A return of -EAGAIN (which only
344 * happens with indirect mounts) means the expire completed
345 * and the directory was removed, so just go ahead and try
346 * the mount.
347 */
348 status = do_expire_wait(dentry);
349 if (status && status != -EAGAIN)
350 return NULL;
351
352 /* Callback to the daemon to perform the mount or wait */
353 spin_lock(&sbi->fs_lock);
354 if (ino->flags & AUTOFS_INF_PENDING) {
355 spin_unlock(&sbi->fs_lock);
356 status = autofs4_mount_wait(dentry);
357 if (status)
358 return ERR_PTR(status);
Ian Kent10584212011-01-14 18:45:58 +0000359 goto done;
360 }
361
362 /*
363 * If the dentry is a symlink it's equivalent to a directory
Ian Kentb5b80172011-01-14 18:46:03 +0000364 * having d_mountpoint() true, so there's no need to call back
Ian Kent10584212011-01-14 18:45:58 +0000365 * to the daemon.
366 */
Ian Kentf55fb0c2012-12-14 10:23:23 +0800367 if (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)) {
368 spin_unlock(&sbi->fs_lock);
Ian Kent10584212011-01-14 18:45:58 +0000369 goto done;
Ian Kentf55fb0c2012-12-14 10:23:23 +0800370 }
371
Ian Kentb5b80172011-01-14 18:46:03 +0000372 if (!d_mountpoint(dentry)) {
373 /*
374 * It's possible that user space hasn't removed directories
375 * after umounting a rootless multi-mount, although it
376 * should. For v5 have_submounts() is sufficient to handle
377 * this because the leaves of the directory tree under the
378 * mount never trigger mounts themselves (they have an autofs
379 * trigger mount mounted on them). But v4 pseudo direct mounts
NeilBrown3b97dd02014-08-08 14:19:58 -0700380 * do need the leaves to trigger mounts. In this case we
Ian Kentb5b80172011-01-14 18:46:03 +0000381 * have no choice but to use the list_empty() check and
382 * require user space behave.
383 */
384 if (sbi->version > 4) {
Ian Kentf55fb0c2012-12-14 10:23:23 +0800385 if (have_submounts(dentry)) {
386 spin_unlock(&sbi->fs_lock);
Ian Kentb5b80172011-01-14 18:46:03 +0000387 goto done;
Ian Kentf55fb0c2012-12-14 10:23:23 +0800388 }
Ian Kentb5b80172011-01-14 18:46:03 +0000389 } else {
Peter Huewe9d8072e2013-03-01 19:46:40 +0800390 if (!simple_empty(dentry)) {
391 spin_unlock(&sbi->fs_lock);
Ian Kentb5b80172011-01-14 18:46:03 +0000392 goto done;
Peter Huewe9d8072e2013-03-01 19:46:40 +0800393 }
Ian Kentb5b80172011-01-14 18:46:03 +0000394 }
Ian Kent10584212011-01-14 18:45:58 +0000395 ino->flags |= AUTOFS_INF_PENDING;
Ian Kent10584212011-01-14 18:45:58 +0000396 spin_unlock(&sbi->fs_lock);
397 status = autofs4_mount_wait(dentry);
Ian Kent10584212011-01-14 18:45:58 +0000398 spin_lock(&sbi->fs_lock);
399 ino->flags &= ~AUTOFS_INF_PENDING;
Ian Kent49999ab2012-10-11 08:00:33 +0800400 if (status) {
401 spin_unlock(&sbi->fs_lock);
402 return ERR_PTR(status);
403 }
Ian Kent10584212011-01-14 18:45:58 +0000404 }
Ian Kent10584212011-01-14 18:45:58 +0000405 spin_unlock(&sbi->fs_lock);
Ian Kentf55fb0c2012-12-14 10:23:23 +0800406done:
Ian Kent10584212011-01-14 18:45:58 +0000407 /* Mount succeeded, check if we ended up with a new dentry */
408 dentry = autofs4_mountpoint_changed(path);
409 if (!dentry)
410 return ERR_PTR(-ENOENT);
411
412 return NULL;
413}
414
Claudiu Ghioc95482982013-05-06 13:47:16 +0800415static int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
Ian Kentb5b80172011-01-14 18:46:03 +0000416{
417 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
Ian Kentf55fb0c2012-12-14 10:23:23 +0800418 struct autofs_info *ino = autofs4_dentry_ino(dentry);
419 int status;
Ian Kentb5b80172011-01-14 18:46:03 +0000420
421 DPRINTK("dentry=%p %.*s",
422 dentry, dentry->d_name.len, dentry->d_name.name);
423
424 /* The daemon never waits. */
Al Viro1aed3e42011-03-18 09:09:02 -0400425 if (autofs4_oz_mode(sbi)) {
Ian Kent83fb96b2011-03-25 01:51:25 +0800426 if (rcu_walk)
427 return 0;
Ian Kentb5b80172011-01-14 18:46:03 +0000428 if (!d_mountpoint(dentry))
429 return -EISDIR;
430 return 0;
431 }
432
David Howellsab909112011-01-14 18:46:51 +0000433 /* We need to sleep, so we need pathwalk to be in ref-mode */
434 if (rcu_walk)
435 return -ECHILD;
436
Ian Kentb5b80172011-01-14 18:46:03 +0000437 /* Wait for pending expires */
438 do_expire_wait(dentry);
439
440 /*
441 * This dentry may be under construction so wait on mount
442 * completion.
443 */
Ian Kentf55fb0c2012-12-14 10:23:23 +0800444 status = autofs4_mount_wait(dentry);
445 if (status)
446 return status;
447
448 spin_lock(&sbi->fs_lock);
449 /*
450 * If the dentry has been selected for expire while we slept
451 * on the lock then it might go away. We'll deal with that in
452 * ->d_automount() and wait on a new mount if the expire
453 * succeeds or return here if it doesn't (since there's no
454 * mount to follow with a rootless multi-mount).
455 */
456 if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
457 /*
458 * Any needed mounting has been completed and the path
459 * updated so check if this is a rootless multi-mount so
460 * we can avoid needless calls ->d_automount() and avoid
461 * an incorrect ELOOP error return.
462 */
463 if ((!d_mountpoint(dentry) && !simple_empty(dentry)) ||
464 (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
465 status = -EISDIR;
466 }
467 spin_unlock(&sbi->fs_lock);
468
469 return status;
Ian Kentb5b80172011-01-14 18:46:03 +0000470}
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472/* Lookups in the root directory */
Al Viro00cd8dd2012-06-10 17:13:09 -0400473static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 struct autofs_sb_info *sbi;
Ian Kent25767372008-07-23 21:30:12 -0700476 struct autofs_info *ino;
Ian Kent10584212011-01-14 18:45:58 +0000477 struct dentry *active;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
Ian Kent10584212011-01-14 18:45:58 +0000479 DPRINTK("name = %.*s", dentry->d_name.len, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Ian Kent718c6042006-03-27 01:14:42 -0800481 /* File name too long to exist */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (dentry->d_name.len > NAME_MAX)
Ian Kent718c6042006-03-27 01:14:42 -0800483 return ERR_PTR(-ENAMETOOLONG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 sbi = autofs4_sbi(dir->i_sb);
Ian Kent718c6042006-03-27 01:14:42 -0800486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
Ian Kentc0bcc9d2011-01-18 12:06:15 +0800488 current->pid, task_pgrp_nr(current), sbi->catatonic,
489 autofs4_oz_mode(sbi));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Ian Kent6510c9d2009-12-15 16:45:47 -0800491 active = autofs4_lookup_active(dentry);
Ian Kent90387c92009-12-15 16:45:46 -0800492 if (active) {
Ian Kent10584212011-01-14 18:45:58 +0000493 return active;
Ian Kentaa952eb2009-12-15 16:45:45 -0800494 } else {
Al Viro4b1ae272010-03-03 12:58:31 -0500495 /*
Ian Kent10584212011-01-14 18:45:58 +0000496 * A dentry that is not within the root can never trigger a
497 * mount operation, unless the directory already exists, so we
498 * can return fail immediately. The daemon however does need
499 * to create directories within the file system.
Al Viro4b1ae272010-03-03 12:58:31 -0500500 */
Ian Kent10584212011-01-14 18:45:58 +0000501 if (!autofs4_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
502 return ERR_PTR(-ENOENT);
503
504 /* Mark entries in the root as mount triggers */
David Howellsb650c852011-01-15 10:51:57 +0000505 if (autofs_type_indirect(sbi->type) && IS_ROOT(dentry->d_parent))
Ian Kentb5b80172011-01-14 18:46:03 +0000506 __managed_dentry_set_managed(dentry);
Ian Kent10584212011-01-14 18:45:58 +0000507
Al Viro26e6c912011-01-16 18:43:40 -0500508 ino = autofs4_new_ino(sbi);
Al Viro4b1ae272010-03-03 12:58:31 -0500509 if (!ino)
510 return ERR_PTR(-ENOMEM);
511
512 dentry->d_fsdata = ino;
513 ino->dentry = dentry;
514
515 autofs4_add_active(dentry);
516
517 d_instantiate(dentry, NULL);
Ian Kent25767372008-07-23 21:30:12 -0700518 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 return NULL;
520}
521
522static int autofs4_dir_symlink(struct inode *dir,
523 struct dentry *dentry,
524 const char *symname)
525{
526 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
527 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800528 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 struct inode *inode;
Al Viro0bf71d42011-01-16 17:39:15 -0500530 size_t size = strlen(symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 char *cp;
532
533 DPRINTK("%s <- %.*s", symname,
534 dentry->d_name.len, dentry->d_name.name);
535
536 if (!autofs4_oz_mode(sbi))
537 return -EACCES;
538
Al Viro5a37db32011-01-16 18:29:35 -0500539 BUG_ON(!ino);
540
Al Viro26e6c912011-01-16 18:43:40 -0500541 autofs4_clean_ino(ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Al Viro4b1ae272010-03-03 12:58:31 -0500543 autofs4_del_active(dentry);
544
Al Viro0bf71d42011-01-16 17:39:15 -0500545 cp = kmalloc(size + 1, GFP_KERNEL);
Al Viro5a37db32011-01-16 18:29:35 -0500546 if (!cp)
Ian Kent25767372008-07-23 21:30:12 -0700547 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
549 strcpy(cp, symname);
550
Al Viro726a5e02011-01-16 17:43:52 -0500551 inode = autofs4_get_inode(dir->i_sb, S_IFLNK | 0555);
Ian Kent25767372008-07-23 21:30:12 -0700552 if (!inode) {
553 kfree(cp);
554 if (!dentry->d_fsdata)
555 kfree(ino);
556 return -ENOMEM;
557 }
Al Viro292c5ee2011-01-17 00:47:38 -0500558 inode->i_private = cp;
Al Viro0bf71d42011-01-16 17:39:15 -0500559 inode->i_size = size;
Ian Kent1864f7b2007-08-22 14:01:54 -0700560 d_add(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Al Viro5a37db32011-01-16 18:29:35 -0500562 dget(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800563 atomic_inc(&ino->count);
564 p_ino = autofs4_dentry_ino(dentry->d_parent);
Rui Xiangc24930a2014-01-23 15:55:00 -0800565 if (p_ino && !IS_ROOT(dentry))
Ian Kent1aff3c82006-03-27 01:14:46 -0800566 atomic_inc(&p_ino->count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
568 dir->i_mtime = CURRENT_TIME;
569
570 return 0;
571}
572
573/*
574 * NOTE!
575 *
576 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
577 * that the file no longer exists. However, doing that means that the
578 * VFS layer can turn the dentry into a negative dentry. We don't want
Ian Kentf50b6f82007-02-20 13:58:10 -0800579 * this, because the unlink is probably the result of an expire.
Ian Kent5f6f4f22008-07-23 21:30:09 -0700580 * We simply d_drop it and add it to a expiring list in the super block,
581 * which allows the dentry lookup to check for an incomplete expire.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 *
583 * If a process is blocked on the dentry waiting for the expire to finish,
584 * it will invalidate the dentry and try to mount with a new one.
585 *
586 * Also see autofs4_dir_rmdir()..
587 */
588static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
589{
590 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
591 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800592 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
594 /* This allows root to remove symlinks */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700595 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
Zhao Hongjiang41735812013-02-20 13:13:55 +1100596 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Ian Kent1aff3c82006-03-27 01:14:46 -0800598 if (atomic_dec_and_test(&ino->count)) {
599 p_ino = autofs4_dentry_ino(dentry->d_parent);
Rui Xiangc24930a2014-01-23 15:55:00 -0800600 if (p_ino && !IS_ROOT(dentry))
Ian Kent1aff3c82006-03-27 01:14:46 -0800601 atomic_dec(&p_ino->count);
602 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 dput(ino->dentry);
604
605 dentry->d_inode->i_size = 0;
Dave Hansence71ec32006-09-30 23:29:06 -0700606 clear_nlink(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
608 dir->i_mtime = CURRENT_TIME;
609
Ian Kente7854722011-03-25 01:51:31 +0800610 spin_lock(&sbi->lookup_lock);
611 __autofs4_add_expiring(dentry);
Ian Kent0259cb02012-12-14 10:23:29 +0800612 d_drop(dentry);
Ian Kente7854722011-03-25 01:51:31 +0800613 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
615 return 0;
616}
617
Ian Kentdd89f902011-01-14 18:46:35 +0000618/*
619 * Version 4 of autofs provides a pseudo direct mount implementation
620 * that relies on directories at the leaves of a directory tree under
621 * an indirect mount to trigger mounts. To allow for this we need to
622 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
623 * of the directory tree. There is no need to clear the automount flag
624 * following a mount or restore it after an expire because these mounts
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300625 * are always covered. However, it is necessary to ensure that these
Ian Kentdd89f902011-01-14 18:46:35 +0000626 * flags are clear on non-empty directories to avoid unnecessary calls
627 * during path walks.
628 */
629static void autofs_set_leaf_automount_flags(struct dentry *dentry)
630{
631 struct dentry *parent;
632
633 /* root and dentrys in the root are already handled */
634 if (IS_ROOT(dentry->d_parent))
635 return;
636
637 managed_dentry_set_managed(dentry);
638
639 parent = dentry->d_parent;
640 /* only consider parents below dentrys in the root */
641 if (IS_ROOT(parent->d_parent))
642 return;
643 managed_dentry_clear_managed(parent);
644 return;
645}
646
647static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
648{
649 struct list_head *d_child;
650 struct dentry *parent;
651
652 /* flags for dentrys in the root are handled elsewhere */
653 if (IS_ROOT(dentry->d_parent))
654 return;
655
656 managed_dentry_clear_managed(dentry);
657
658 parent = dentry->d_parent;
659 /* only consider parents below dentrys in the root */
660 if (IS_ROOT(parent->d_parent))
661 return;
662 d_child = &dentry->d_u.d_child;
663 /* Set parent managed if it's becoming empty */
664 if (d_child->next == &parent->d_subdirs &&
665 d_child->prev == &parent->d_subdirs)
666 managed_dentry_set_managed(parent);
667 return;
668}
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
671{
672 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
673 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800674 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
Ian Kentf50b6f82007-02-20 13:58:10 -0800676 DPRINTK("dentry %p, removing %.*s",
677 dentry, dentry->d_name.len, dentry->d_name.name);
678
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 if (!autofs4_oz_mode(sbi))
680 return -EACCES;
681
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100682 spin_lock(&sbi->lookup_lock);
Ian Kent0259cb02012-12-14 10:23:29 +0800683 if (!simple_empty(dentry)) {
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100684 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 return -ENOTEMPTY;
686 }
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100687 __autofs4_add_expiring(dentry);
Ian Kent0259cb02012-12-14 10:23:29 +0800688 d_drop(dentry);
Ian Kente7854722011-03-25 01:51:31 +0800689 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Ian Kentdd89f902011-01-14 18:46:35 +0000691 if (sbi->version < 5)
692 autofs_clear_leaf_automount_flags(dentry);
693
Ian Kent1aff3c82006-03-27 01:14:46 -0800694 if (atomic_dec_and_test(&ino->count)) {
695 p_ino = autofs4_dentry_ino(dentry->d_parent);
696 if (p_ino && dentry->d_parent != dentry)
697 atomic_dec(&p_ino->count);
698 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 dput(ino->dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 dentry->d_inode->i_size = 0;
Dave Hansence71ec32006-09-30 23:29:06 -0700701 clear_nlink(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 if (dir->i_nlink)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700704 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
706 return 0;
707}
708
Al Viro18bb1db2011-07-26 01:41:39 -0400709static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710{
711 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
712 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800713 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 struct inode *inode;
715
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700716 if (!autofs4_oz_mode(sbi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 return -EACCES;
718
719 DPRINTK("dentry %p, creating %.*s",
720 dentry, dentry->d_name.len, dentry->d_name.name);
721
Al Viro5a37db32011-01-16 18:29:35 -0500722 BUG_ON(!ino);
723
Al Viro26e6c912011-01-16 18:43:40 -0500724 autofs4_clean_ino(ino);
Ian Kent25767372008-07-23 21:30:12 -0700725
Al Viro4b1ae272010-03-03 12:58:31 -0500726 autofs4_del_active(dentry);
727
Al Viro726a5e02011-01-16 17:43:52 -0500728 inode = autofs4_get_inode(dir->i_sb, S_IFDIR | 0555);
Al Viro5a37db32011-01-16 18:29:35 -0500729 if (!inode)
Ian Kent25767372008-07-23 21:30:12 -0700730 return -ENOMEM;
Ian Kent1864f7b2007-08-22 14:01:54 -0700731 d_add(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Ian Kentdd89f902011-01-14 18:46:35 +0000733 if (sbi->version < 5)
734 autofs_set_leaf_automount_flags(dentry);
735
Al Viro5a37db32011-01-16 18:29:35 -0500736 dget(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800737 atomic_inc(&ino->count);
738 p_ino = autofs4_dentry_ino(dentry->d_parent);
Rui Xiangc24930a2014-01-23 15:55:00 -0800739 if (p_ino && !IS_ROOT(dentry))
Ian Kent1aff3c82006-03-27 01:14:46 -0800740 atomic_inc(&p_ino->count);
Dave Hansend8c76e62006-09-30 23:29:04 -0700741 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 dir->i_mtime = CURRENT_TIME;
743
744 return 0;
745}
746
747/* Get/set timeout ioctl() operation */
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200748#ifdef CONFIG_COMPAT
749static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi,
750 compat_ulong_t __user *p)
751{
752 int rv;
753 unsigned long ntimeout;
754
755 if ((rv = get_user(ntimeout, p)) ||
756 (rv = put_user(sbi->exp_timeout/HZ, p)))
757 return rv;
758
759 if (ntimeout > UINT_MAX/HZ)
760 sbi->exp_timeout = 0;
761 else
762 sbi->exp_timeout = ntimeout * HZ;
763
764 return 0;
765}
766#endif
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
769 unsigned long __user *p)
770{
771 int rv;
772 unsigned long ntimeout;
773
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700774 if ((rv = get_user(ntimeout, p)) ||
775 (rv = put_user(sbi->exp_timeout/HZ, p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 return rv;
777
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700778 if (ntimeout > ULONG_MAX/HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 sbi->exp_timeout = 0;
780 else
781 sbi->exp_timeout = ntimeout * HZ;
782
783 return 0;
784}
785
786/* Return protocol version */
787static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p)
788{
789 return put_user(sbi->version, p);
790}
791
792/* Return protocol sub version */
793static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p)
794{
795 return put_user(sbi->sub_version, p);
796}
797
798/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799* Tells the daemon whether it can umount the autofs mount.
800*/
801static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
802{
803 int status = 0;
804
Ian Kente3474a82006-03-27 01:14:51 -0800805 if (may_umount(mnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 status = 1;
807
808 DPRINTK("returning %d", status);
809
810 status = put_user(status, p);
811
812 return status;
813}
814
815/* Identify autofs4_dentries - this is so we can tell if there's
816 an extra dentry refcount or not. We only hold a refcount on the
817 dentry if its non-negative (ie, d_inode != NULL)
818*/
819int is_autofs4_dentry(struct dentry *dentry)
820{
821 return dentry && dentry->d_inode &&
David Howellsb650c852011-01-15 10:51:57 +0000822 dentry->d_op == &autofs4_dentry_operations &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 dentry->d_fsdata != NULL;
824}
825
826/*
827 * ioctl()'s on the root directory is the chief method for the daemon to
828 * generate kernel reactions
829 */
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200830static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
831 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832{
833 struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
834 void __user *p = (void __user *)arg;
835
836 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
Pavel Emelianova47afb02007-10-18 23:39:46 -0700837 cmd,arg,sbi,task_pgrp_nr(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700839 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
840 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 return -ENOTTY;
842
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700843 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 return -EPERM;
845
846 switch(cmd) {
847 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
848 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0);
849 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
850 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
851 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
852 autofs4_catatonic_mode(sbi);
853 return 0;
854 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
855 return autofs4_get_protover(sbi, p);
856 case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
857 return autofs4_get_protosubver(sbi, p);
858 case AUTOFS_IOC_SETTIMEOUT:
859 return autofs4_get_set_timeout(sbi, p);
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200860#ifdef CONFIG_COMPAT
861 case AUTOFS_IOC_SETTIMEOUT32:
862 return autofs4_compat_get_set_timeout(sbi, p);
863#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 case AUTOFS_IOC_ASKUMOUNT:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800866 return autofs4_ask_umount(filp->f_path.mnt, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
868 /* return a single thing to expire */
869 case AUTOFS_IOC_EXPIRE:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800870 return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 /* same as above, but can send multiple expires through pipe */
872 case AUTOFS_IOC_EXPIRE_MULTI:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800873 return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
875 default:
876 return -ENOSYS;
877 }
878}
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200879
880static long autofs4_root_ioctl(struct file *filp,
881 unsigned int cmd, unsigned long arg)
882{
Al Viro496ad9a2013-01-23 17:07:38 -0500883 struct inode *inode = file_inode(filp);
Ian Kentde47de72010-12-07 13:04:00 +0800884 return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200885}
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200886
887#ifdef CONFIG_COMPAT
888static long autofs4_root_compat_ioctl(struct file *filp,
889 unsigned int cmd, unsigned long arg)
890{
Al Viro496ad9a2013-01-23 17:07:38 -0500891 struct inode *inode = file_inode(filp);
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200892 int ret;
893
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200894 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
895 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
896 else
897 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd,
898 (unsigned long)compat_ptr(arg));
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200899
900 return ret;
901}
902#endif