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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 spin_lock(&sbi->lookup_lock);
170 head = &sbi->active_list;
171 list_for_each(p, head) {
172 struct autofs_info *ino;
Ian Kente4d5ade2009-12-15 16:45:49 -0800173 struct dentry *active;
Ian Kent25767372008-07-23 21:30:12 -0700174 struct qstr *qstr;
175
176 ino = list_entry(p, struct autofs_info, active);
Ian Kente4d5ade2009-12-15 16:45:49 -0800177 active = ino->dentry;
Ian Kent25767372008-07-23 21:30:12 -0700178
Ian Kente4d5ade2009-12-15 16:45:49 -0800179 spin_lock(&active->d_lock);
Ian Kent25767372008-07-23 21:30:12 -0700180
181 /* Already gone? */
Ian Kent6b6751f2014-05-06 12:50:06 -0700182 if ((int) d_count(active) <= 0)
Ian Kent25767372008-07-23 21:30:12 -0700183 goto next;
184
Ian Kente4d5ade2009-12-15 16:45:49 -0800185 qstr = &active->d_name;
Ian Kent25767372008-07-23 21:30:12 -0700186
Ian Kente4d5ade2009-12-15 16:45:49 -0800187 if (active->d_name.hash != hash)
Ian Kent25767372008-07-23 21:30:12 -0700188 goto next;
Ian Kente4d5ade2009-12-15 16:45:49 -0800189 if (active->d_parent != parent)
Ian Kent25767372008-07-23 21:30:12 -0700190 goto next;
191
192 if (qstr->len != len)
193 goto next;
194 if (memcmp(qstr->name, str, len))
195 goto next;
196
Al Viro4b1ae272010-03-03 12:58:31 -0500197 if (d_unhashed(active)) {
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100198 dget_dlock(active);
Al Viro4b1ae272010-03-03 12:58:31 -0500199 spin_unlock(&active->d_lock);
200 spin_unlock(&sbi->lookup_lock);
Al Viro4b1ae272010-03-03 12:58:31 -0500201 return active;
202 }
Ian Kent25767372008-07-23 21:30:12 -0700203next:
Ian Kente4d5ade2009-12-15 16:45:49 -0800204 spin_unlock(&active->d_lock);
Ian Kent25767372008-07-23 21:30:12 -0700205 }
206 spin_unlock(&sbi->lookup_lock);
Ian Kent25767372008-07-23 21:30:12 -0700207
208 return NULL;
209}
210
Ian Kent6510c9d2009-12-15 16:45:47 -0800211static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
Ian Kentf50b6f82007-02-20 13:58:10 -0800212{
Ian Kent6510c9d2009-12-15 16:45:47 -0800213 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
214 struct dentry *parent = dentry->d_parent;
215 struct qstr *name = &dentry->d_name;
Ian Kentf50b6f82007-02-20 13:58:10 -0800216 unsigned int len = name->len;
217 unsigned int hash = name->hash;
218 const unsigned char *str = name->name;
219 struct list_head *p, *head;
220
Ian Kent5f6f4f22008-07-23 21:30:09 -0700221 spin_lock(&sbi->lookup_lock);
222 head = &sbi->expiring_list;
Ian Kentf50b6f82007-02-20 13:58:10 -0800223 list_for_each(p, head) {
224 struct autofs_info *ino;
Ian Kentcb4b4922009-12-15 16:45:50 -0800225 struct dentry *expiring;
Ian Kentf50b6f82007-02-20 13:58:10 -0800226 struct qstr *qstr;
227
Ian Kent5f6f4f22008-07-23 21:30:09 -0700228 ino = list_entry(p, struct autofs_info, expiring);
Ian Kentcb4b4922009-12-15 16:45:50 -0800229 expiring = ino->dentry;
Ian Kentf50b6f82007-02-20 13:58:10 -0800230
Ian Kentcb4b4922009-12-15 16:45:50 -0800231 spin_lock(&expiring->d_lock);
Ian Kentf50b6f82007-02-20 13:58:10 -0800232
Ian Kent6b6751f2014-05-06 12:50:06 -0700233 /* We've already been dentry_iput or unlinked */
Ian Kentcb4b4922009-12-15 16:45:50 -0800234 if (!expiring->d_inode)
Ian Kentf50b6f82007-02-20 13:58:10 -0800235 goto next;
236
Ian Kentcb4b4922009-12-15 16:45:50 -0800237 qstr = &expiring->d_name;
Ian Kentf50b6f82007-02-20 13:58:10 -0800238
Ian Kentcb4b4922009-12-15 16:45:50 -0800239 if (expiring->d_name.hash != hash)
Ian Kentf50b6f82007-02-20 13:58:10 -0800240 goto next;
Ian Kentcb4b4922009-12-15 16:45:50 -0800241 if (expiring->d_parent != parent)
Ian Kentf50b6f82007-02-20 13:58:10 -0800242 goto next;
243
244 if (qstr->len != len)
245 goto next;
246 if (memcmp(qstr->name, str, len))
247 goto next;
248
Al Viro4b1ae272010-03-03 12:58:31 -0500249 if (d_unhashed(expiring)) {
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100250 dget_dlock(expiring);
Al Viro4b1ae272010-03-03 12:58:31 -0500251 spin_unlock(&expiring->d_lock);
252 spin_unlock(&sbi->lookup_lock);
Al Viro4b1ae272010-03-03 12:58:31 -0500253 return expiring;
254 }
Ian Kentf50b6f82007-02-20 13:58:10 -0800255next:
Ian Kentcb4b4922009-12-15 16:45:50 -0800256 spin_unlock(&expiring->d_lock);
Ian Kentf50b6f82007-02-20 13:58:10 -0800257 }
Ian Kent5f6f4f22008-07-23 21:30:09 -0700258 spin_unlock(&sbi->lookup_lock);
Ian Kentf50b6f82007-02-20 13:58:10 -0800259
260 return NULL;
261}
262
Ian Kent10584212011-01-14 18:45:58 +0000263static int autofs4_mount_wait(struct dentry *dentry)
264{
265 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
266 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent3c319982011-03-25 01:51:08 +0800267 int status = 0;
Ian Kent10584212011-01-14 18:45:58 +0000268
269 if (ino->flags & AUTOFS_INF_PENDING) {
270 DPRINTK("waiting for mount name=%.*s",
271 dentry->d_name.len, dentry->d_name.name);
272 status = autofs4_wait(sbi, dentry, NFY_MOUNT);
273 DPRINTK("mount wait done status=%d", status);
Ian Kent10584212011-01-14 18:45:58 +0000274 }
Ian Kent3c319982011-03-25 01:51:08 +0800275 ino->last_used = jiffies;
276 return status;
Ian Kent10584212011-01-14 18:45:58 +0000277}
278
279static int do_expire_wait(struct dentry *dentry)
280{
281 struct dentry *expiring;
282
283 expiring = autofs4_lookup_expiring(dentry);
284 if (!expiring)
285 return autofs4_expire_wait(dentry);
286 else {
287 /*
288 * If we are racing with expire the request might not
289 * be quite complete, but the directory has been removed
290 * so it must have been successful, just wait for it.
291 */
292 autofs4_expire_wait(expiring);
293 autofs4_del_expiring(expiring);
294 dput(expiring);
295 }
296 return 0;
297}
298
299static struct dentry *autofs4_mountpoint_changed(struct path *path)
300{
301 struct dentry *dentry = path->dentry;
302 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
303
304 /*
305 * If this is an indirect mount the dentry could have gone away
306 * as a result of an expire and a new one created.
307 */
308 if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
309 struct dentry *parent = dentry->d_parent;
Ian Kent3c319982011-03-25 01:51:08 +0800310 struct autofs_info *ino;
Ian Kent10584212011-01-14 18:45:58 +0000311 struct dentry *new = d_lookup(parent, &dentry->d_name);
312 if (!new)
313 return NULL;
Ian Kent3c319982011-03-25 01:51:08 +0800314 ino = autofs4_dentry_ino(new);
315 ino->last_used = jiffies;
Ian Kent10584212011-01-14 18:45:58 +0000316 dput(path->dentry);
317 path->dentry = new;
318 }
319 return path->dentry;
320}
321
Ian Kent71e469d2011-01-14 18:46:19 +0000322static struct vfsmount *autofs4_d_automount(struct path *path)
Ian Kent10584212011-01-14 18:45:58 +0000323{
324 struct dentry *dentry = path->dentry;
325 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
326 struct autofs_info *ino = autofs4_dentry_ino(dentry);
327 int status;
328
329 DPRINTK("dentry=%p %.*s",
330 dentry, dentry->d_name.len, dentry->d_name.name);
331
332 /* The daemon never triggers a mount. */
333 if (autofs4_oz_mode(sbi))
334 return NULL;
335
336 /*
337 * If an expire request is pending everyone must wait.
338 * If the expire fails we're still mounted so continue
339 * the follow and return. A return of -EAGAIN (which only
340 * happens with indirect mounts) means the expire completed
341 * and the directory was removed, so just go ahead and try
342 * the mount.
343 */
344 status = do_expire_wait(dentry);
345 if (status && status != -EAGAIN)
346 return NULL;
347
348 /* Callback to the daemon to perform the mount or wait */
349 spin_lock(&sbi->fs_lock);
350 if (ino->flags & AUTOFS_INF_PENDING) {
351 spin_unlock(&sbi->fs_lock);
352 status = autofs4_mount_wait(dentry);
353 if (status)
354 return ERR_PTR(status);
Ian Kent10584212011-01-14 18:45:58 +0000355 goto done;
356 }
357
358 /*
359 * If the dentry is a symlink it's equivalent to a directory
Ian Kentb5b80172011-01-14 18:46:03 +0000360 * having d_mountpoint() true, so there's no need to call back
Ian Kent10584212011-01-14 18:45:58 +0000361 * to the daemon.
362 */
Ian Kentf55fb0c2012-12-14 10:23:23 +0800363 if (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)) {
364 spin_unlock(&sbi->fs_lock);
Ian Kent10584212011-01-14 18:45:58 +0000365 goto done;
Ian Kentf55fb0c2012-12-14 10:23:23 +0800366 }
367
Ian Kentb5b80172011-01-14 18:46:03 +0000368 if (!d_mountpoint(dentry)) {
369 /*
370 * It's possible that user space hasn't removed directories
371 * after umounting a rootless multi-mount, although it
372 * should. For v5 have_submounts() is sufficient to handle
373 * this because the leaves of the directory tree under the
374 * mount never trigger mounts themselves (they have an autofs
375 * trigger mount mounted on them). But v4 pseudo direct mounts
376 * do need the leaves to to trigger mounts. In this case we
377 * have no choice but to use the list_empty() check and
378 * require user space behave.
379 */
380 if (sbi->version > 4) {
Ian Kentf55fb0c2012-12-14 10:23:23 +0800381 if (have_submounts(dentry)) {
382 spin_unlock(&sbi->fs_lock);
Ian Kentb5b80172011-01-14 18:46:03 +0000383 goto done;
Ian Kentf55fb0c2012-12-14 10:23:23 +0800384 }
Ian Kentb5b80172011-01-14 18:46:03 +0000385 } else {
Peter Huewe9d8072e2013-03-01 19:46:40 +0800386 if (!simple_empty(dentry)) {
387 spin_unlock(&sbi->fs_lock);
Ian Kentb5b80172011-01-14 18:46:03 +0000388 goto done;
Peter Huewe9d8072e2013-03-01 19:46:40 +0800389 }
Ian Kentb5b80172011-01-14 18:46:03 +0000390 }
Ian Kent10584212011-01-14 18:45:58 +0000391 ino->flags |= AUTOFS_INF_PENDING;
Ian Kent10584212011-01-14 18:45:58 +0000392 spin_unlock(&sbi->fs_lock);
393 status = autofs4_mount_wait(dentry);
Ian Kent10584212011-01-14 18:45:58 +0000394 spin_lock(&sbi->fs_lock);
395 ino->flags &= ~AUTOFS_INF_PENDING;
Ian Kent49999ab2012-10-11 08:00:33 +0800396 if (status) {
397 spin_unlock(&sbi->fs_lock);
398 return ERR_PTR(status);
399 }
Ian Kent10584212011-01-14 18:45:58 +0000400 }
Ian Kent10584212011-01-14 18:45:58 +0000401 spin_unlock(&sbi->fs_lock);
Ian Kentf55fb0c2012-12-14 10:23:23 +0800402done:
Ian Kent10584212011-01-14 18:45:58 +0000403 /* Mount succeeded, check if we ended up with a new dentry */
404 dentry = autofs4_mountpoint_changed(path);
405 if (!dentry)
406 return ERR_PTR(-ENOENT);
407
408 return NULL;
409}
410
Claudiu Ghioc95482982013-05-06 13:47:16 +0800411static int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
Ian Kentb5b80172011-01-14 18:46:03 +0000412{
413 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
Ian Kentf55fb0c2012-12-14 10:23:23 +0800414 struct autofs_info *ino = autofs4_dentry_ino(dentry);
415 int status;
Ian Kentb5b80172011-01-14 18:46:03 +0000416
417 DPRINTK("dentry=%p %.*s",
418 dentry, dentry->d_name.len, dentry->d_name.name);
419
420 /* The daemon never waits. */
Al Viro1aed3e42011-03-18 09:09:02 -0400421 if (autofs4_oz_mode(sbi)) {
Ian Kent83fb96b2011-03-25 01:51:25 +0800422 if (rcu_walk)
423 return 0;
Ian Kentb5b80172011-01-14 18:46:03 +0000424 if (!d_mountpoint(dentry))
425 return -EISDIR;
426 return 0;
427 }
428
David Howellsab909112011-01-14 18:46:51 +0000429 /* We need to sleep, so we need pathwalk to be in ref-mode */
430 if (rcu_walk)
431 return -ECHILD;
432
Ian Kentb5b80172011-01-14 18:46:03 +0000433 /* Wait for pending expires */
434 do_expire_wait(dentry);
435
436 /*
437 * This dentry may be under construction so wait on mount
438 * completion.
439 */
Ian Kentf55fb0c2012-12-14 10:23:23 +0800440 status = autofs4_mount_wait(dentry);
441 if (status)
442 return status;
443
444 spin_lock(&sbi->fs_lock);
445 /*
446 * If the dentry has been selected for expire while we slept
447 * on the lock then it might go away. We'll deal with that in
448 * ->d_automount() and wait on a new mount if the expire
449 * succeeds or return here if it doesn't (since there's no
450 * mount to follow with a rootless multi-mount).
451 */
452 if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
453 /*
454 * Any needed mounting has been completed and the path
455 * updated so check if this is a rootless multi-mount so
456 * we can avoid needless calls ->d_automount() and avoid
457 * an incorrect ELOOP error return.
458 */
459 if ((!d_mountpoint(dentry) && !simple_empty(dentry)) ||
460 (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
461 status = -EISDIR;
462 }
463 spin_unlock(&sbi->fs_lock);
464
465 return status;
Ian Kentb5b80172011-01-14 18:46:03 +0000466}
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468/* Lookups in the root directory */
Al Viro00cd8dd2012-06-10 17:13:09 -0400469static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
471 struct autofs_sb_info *sbi;
Ian Kent25767372008-07-23 21:30:12 -0700472 struct autofs_info *ino;
Ian Kent10584212011-01-14 18:45:58 +0000473 struct dentry *active;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Ian Kent10584212011-01-14 18:45:58 +0000475 DPRINTK("name = %.*s", dentry->d_name.len, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
Ian Kent718c6042006-03-27 01:14:42 -0800477 /* File name too long to exist */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 if (dentry->d_name.len > NAME_MAX)
Ian Kent718c6042006-03-27 01:14:42 -0800479 return ERR_PTR(-ENAMETOOLONG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 sbi = autofs4_sbi(dir->i_sb);
Ian Kent718c6042006-03-27 01:14:42 -0800482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
Ian Kentc0bcc9d2011-01-18 12:06:15 +0800484 current->pid, task_pgrp_nr(current), sbi->catatonic,
485 autofs4_oz_mode(sbi));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Ian Kent6510c9d2009-12-15 16:45:47 -0800487 active = autofs4_lookup_active(dentry);
Ian Kent90387c92009-12-15 16:45:46 -0800488 if (active) {
Ian Kent10584212011-01-14 18:45:58 +0000489 return active;
Ian Kentaa952eb2009-12-15 16:45:45 -0800490 } else {
Al Viro4b1ae272010-03-03 12:58:31 -0500491 /*
Ian Kent10584212011-01-14 18:45:58 +0000492 * A dentry that is not within the root can never trigger a
493 * mount operation, unless the directory already exists, so we
494 * can return fail immediately. The daemon however does need
495 * to create directories within the file system.
Al Viro4b1ae272010-03-03 12:58:31 -0500496 */
Ian Kent10584212011-01-14 18:45:58 +0000497 if (!autofs4_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
498 return ERR_PTR(-ENOENT);
499
500 /* Mark entries in the root as mount triggers */
David Howellsb650c852011-01-15 10:51:57 +0000501 if (autofs_type_indirect(sbi->type) && IS_ROOT(dentry->d_parent))
Ian Kentb5b80172011-01-14 18:46:03 +0000502 __managed_dentry_set_managed(dentry);
Ian Kent10584212011-01-14 18:45:58 +0000503
Al Viro26e6c912011-01-16 18:43:40 -0500504 ino = autofs4_new_ino(sbi);
Al Viro4b1ae272010-03-03 12:58:31 -0500505 if (!ino)
506 return ERR_PTR(-ENOMEM);
507
508 dentry->d_fsdata = ino;
509 ino->dentry = dentry;
510
511 autofs4_add_active(dentry);
512
513 d_instantiate(dentry, NULL);
Ian Kent25767372008-07-23 21:30:12 -0700514 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 return NULL;
516}
517
518static int autofs4_dir_symlink(struct inode *dir,
519 struct dentry *dentry,
520 const char *symname)
521{
522 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
523 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800524 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 struct inode *inode;
Al Viro0bf71d42011-01-16 17:39:15 -0500526 size_t size = strlen(symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 char *cp;
528
529 DPRINTK("%s <- %.*s", symname,
530 dentry->d_name.len, dentry->d_name.name);
531
532 if (!autofs4_oz_mode(sbi))
533 return -EACCES;
534
Al Viro5a37db32011-01-16 18:29:35 -0500535 BUG_ON(!ino);
536
Al Viro26e6c912011-01-16 18:43:40 -0500537 autofs4_clean_ino(ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Al Viro4b1ae272010-03-03 12:58:31 -0500539 autofs4_del_active(dentry);
540
Al Viro0bf71d42011-01-16 17:39:15 -0500541 cp = kmalloc(size + 1, GFP_KERNEL);
Al Viro5a37db32011-01-16 18:29:35 -0500542 if (!cp)
Ian Kent25767372008-07-23 21:30:12 -0700543 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 strcpy(cp, symname);
546
Al Viro726a5e02011-01-16 17:43:52 -0500547 inode = autofs4_get_inode(dir->i_sb, S_IFLNK | 0555);
Ian Kent25767372008-07-23 21:30:12 -0700548 if (!inode) {
549 kfree(cp);
550 if (!dentry->d_fsdata)
551 kfree(ino);
552 return -ENOMEM;
553 }
Al Viro292c5ee2011-01-17 00:47:38 -0500554 inode->i_private = cp;
Al Viro0bf71d42011-01-16 17:39:15 -0500555 inode->i_size = size;
Ian Kent1864f7b2007-08-22 14:01:54 -0700556 d_add(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Al Viro5a37db32011-01-16 18:29:35 -0500558 dget(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800559 atomic_inc(&ino->count);
560 p_ino = autofs4_dentry_ino(dentry->d_parent);
Rui Xiangc24930a2014-01-23 15:55:00 -0800561 if (p_ino && !IS_ROOT(dentry))
Ian Kent1aff3c82006-03-27 01:14:46 -0800562 atomic_inc(&p_ino->count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
564 dir->i_mtime = CURRENT_TIME;
565
566 return 0;
567}
568
569/*
570 * NOTE!
571 *
572 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
573 * that the file no longer exists. However, doing that means that the
574 * VFS layer can turn the dentry into a negative dentry. We don't want
Ian Kentf50b6f82007-02-20 13:58:10 -0800575 * this, because the unlink is probably the result of an expire.
Ian Kent5f6f4f22008-07-23 21:30:09 -0700576 * We simply d_drop it and add it to a expiring list in the super block,
577 * which allows the dentry lookup to check for an incomplete expire.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 *
579 * If a process is blocked on the dentry waiting for the expire to finish,
580 * it will invalidate the dentry and try to mount with a new one.
581 *
582 * Also see autofs4_dir_rmdir()..
583 */
584static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
585{
586 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
587 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800588 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 /* This allows root to remove symlinks */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700591 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
Zhao Hongjiang41735812013-02-20 13:13:55 +1100592 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Ian Kent1aff3c82006-03-27 01:14:46 -0800594 if (atomic_dec_and_test(&ino->count)) {
595 p_ino = autofs4_dentry_ino(dentry->d_parent);
Rui Xiangc24930a2014-01-23 15:55:00 -0800596 if (p_ino && !IS_ROOT(dentry))
Ian Kent1aff3c82006-03-27 01:14:46 -0800597 atomic_dec(&p_ino->count);
598 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 dput(ino->dentry);
600
601 dentry->d_inode->i_size = 0;
Dave Hansence71ec32006-09-30 23:29:06 -0700602 clear_nlink(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
604 dir->i_mtime = CURRENT_TIME;
605
Ian Kente7854722011-03-25 01:51:31 +0800606 spin_lock(&sbi->lookup_lock);
607 __autofs4_add_expiring(dentry);
Ian Kent0259cb02012-12-14 10:23:29 +0800608 d_drop(dentry);
Ian Kente7854722011-03-25 01:51:31 +0800609 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 return 0;
612}
613
Ian Kentdd89f902011-01-14 18:46:35 +0000614/*
615 * Version 4 of autofs provides a pseudo direct mount implementation
616 * that relies on directories at the leaves of a directory tree under
617 * an indirect mount to trigger mounts. To allow for this we need to
618 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
619 * of the directory tree. There is no need to clear the automount flag
620 * following a mount or restore it after an expire because these mounts
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300621 * are always covered. However, it is necessary to ensure that these
Ian Kentdd89f902011-01-14 18:46:35 +0000622 * flags are clear on non-empty directories to avoid unnecessary calls
623 * during path walks.
624 */
625static void autofs_set_leaf_automount_flags(struct dentry *dentry)
626{
627 struct dentry *parent;
628
629 /* root and dentrys in the root are already handled */
630 if (IS_ROOT(dentry->d_parent))
631 return;
632
633 managed_dentry_set_managed(dentry);
634
635 parent = dentry->d_parent;
636 /* only consider parents below dentrys in the root */
637 if (IS_ROOT(parent->d_parent))
638 return;
639 managed_dentry_clear_managed(parent);
640 return;
641}
642
643static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
644{
645 struct list_head *d_child;
646 struct dentry *parent;
647
648 /* flags for dentrys in the root are handled elsewhere */
649 if (IS_ROOT(dentry->d_parent))
650 return;
651
652 managed_dentry_clear_managed(dentry);
653
654 parent = dentry->d_parent;
655 /* only consider parents below dentrys in the root */
656 if (IS_ROOT(parent->d_parent))
657 return;
658 d_child = &dentry->d_u.d_child;
659 /* Set parent managed if it's becoming empty */
660 if (d_child->next == &parent->d_subdirs &&
661 d_child->prev == &parent->d_subdirs)
662 managed_dentry_set_managed(parent);
663 return;
664}
665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
667{
668 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
669 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800670 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Ian Kentf50b6f82007-02-20 13:58:10 -0800672 DPRINTK("dentry %p, removing %.*s",
673 dentry, dentry->d_name.len, dentry->d_name.name);
674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 if (!autofs4_oz_mode(sbi))
676 return -EACCES;
677
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100678 spin_lock(&sbi->lookup_lock);
Ian Kent0259cb02012-12-14 10:23:29 +0800679 if (!simple_empty(dentry)) {
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100680 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 return -ENOTEMPTY;
682 }
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100683 __autofs4_add_expiring(dentry);
Ian Kent0259cb02012-12-14 10:23:29 +0800684 d_drop(dentry);
Ian Kente7854722011-03-25 01:51:31 +0800685 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
Ian Kentdd89f902011-01-14 18:46:35 +0000687 if (sbi->version < 5)
688 autofs_clear_leaf_automount_flags(dentry);
689
Ian Kent1aff3c82006-03-27 01:14:46 -0800690 if (atomic_dec_and_test(&ino->count)) {
691 p_ino = autofs4_dentry_ino(dentry->d_parent);
692 if (p_ino && dentry->d_parent != dentry)
693 atomic_dec(&p_ino->count);
694 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 dput(ino->dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 dentry->d_inode->i_size = 0;
Dave Hansence71ec32006-09-30 23:29:06 -0700697 clear_nlink(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 if (dir->i_nlink)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700700 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702 return 0;
703}
704
Al Viro18bb1db2011-07-26 01:41:39 -0400705static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706{
707 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
708 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800709 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 struct inode *inode;
711
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700712 if (!autofs4_oz_mode(sbi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 return -EACCES;
714
715 DPRINTK("dentry %p, creating %.*s",
716 dentry, dentry->d_name.len, dentry->d_name.name);
717
Al Viro5a37db32011-01-16 18:29:35 -0500718 BUG_ON(!ino);
719
Al Viro26e6c912011-01-16 18:43:40 -0500720 autofs4_clean_ino(ino);
Ian Kent25767372008-07-23 21:30:12 -0700721
Al Viro4b1ae272010-03-03 12:58:31 -0500722 autofs4_del_active(dentry);
723
Al Viro726a5e02011-01-16 17:43:52 -0500724 inode = autofs4_get_inode(dir->i_sb, S_IFDIR | 0555);
Al Viro5a37db32011-01-16 18:29:35 -0500725 if (!inode)
Ian Kent25767372008-07-23 21:30:12 -0700726 return -ENOMEM;
Ian Kent1864f7b2007-08-22 14:01:54 -0700727 d_add(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Ian Kentdd89f902011-01-14 18:46:35 +0000729 if (sbi->version < 5)
730 autofs_set_leaf_automount_flags(dentry);
731
Al Viro5a37db32011-01-16 18:29:35 -0500732 dget(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800733 atomic_inc(&ino->count);
734 p_ino = autofs4_dentry_ino(dentry->d_parent);
Rui Xiangc24930a2014-01-23 15:55:00 -0800735 if (p_ino && !IS_ROOT(dentry))
Ian Kent1aff3c82006-03-27 01:14:46 -0800736 atomic_inc(&p_ino->count);
Dave Hansend8c76e62006-09-30 23:29:04 -0700737 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 dir->i_mtime = CURRENT_TIME;
739
740 return 0;
741}
742
743/* Get/set timeout ioctl() operation */
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200744#ifdef CONFIG_COMPAT
745static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi,
746 compat_ulong_t __user *p)
747{
748 int rv;
749 unsigned long ntimeout;
750
751 if ((rv = get_user(ntimeout, p)) ||
752 (rv = put_user(sbi->exp_timeout/HZ, p)))
753 return rv;
754
755 if (ntimeout > UINT_MAX/HZ)
756 sbi->exp_timeout = 0;
757 else
758 sbi->exp_timeout = ntimeout * HZ;
759
760 return 0;
761}
762#endif
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
765 unsigned long __user *p)
766{
767 int rv;
768 unsigned long ntimeout;
769
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700770 if ((rv = get_user(ntimeout, p)) ||
771 (rv = put_user(sbi->exp_timeout/HZ, p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 return rv;
773
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700774 if (ntimeout > ULONG_MAX/HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 sbi->exp_timeout = 0;
776 else
777 sbi->exp_timeout = ntimeout * HZ;
778
779 return 0;
780}
781
782/* Return protocol version */
783static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p)
784{
785 return put_user(sbi->version, p);
786}
787
788/* Return protocol sub version */
789static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p)
790{
791 return put_user(sbi->sub_version, p);
792}
793
794/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795* Tells the daemon whether it can umount the autofs mount.
796*/
797static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
798{
799 int status = 0;
800
Ian Kente3474a82006-03-27 01:14:51 -0800801 if (may_umount(mnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 status = 1;
803
804 DPRINTK("returning %d", status);
805
806 status = put_user(status, p);
807
808 return status;
809}
810
811/* Identify autofs4_dentries - this is so we can tell if there's
812 an extra dentry refcount or not. We only hold a refcount on the
813 dentry if its non-negative (ie, d_inode != NULL)
814*/
815int is_autofs4_dentry(struct dentry *dentry)
816{
817 return dentry && dentry->d_inode &&
David Howellsb650c852011-01-15 10:51:57 +0000818 dentry->d_op == &autofs4_dentry_operations &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 dentry->d_fsdata != NULL;
820}
821
822/*
823 * ioctl()'s on the root directory is the chief method for the daemon to
824 * generate kernel reactions
825 */
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200826static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
827 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828{
829 struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
830 void __user *p = (void __user *)arg;
831
832 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
Pavel Emelianova47afb02007-10-18 23:39:46 -0700833 cmd,arg,sbi,task_pgrp_nr(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700835 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
836 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 return -ENOTTY;
838
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700839 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 return -EPERM;
841
842 switch(cmd) {
843 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
844 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0);
845 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
846 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
847 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
848 autofs4_catatonic_mode(sbi);
849 return 0;
850 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
851 return autofs4_get_protover(sbi, p);
852 case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
853 return autofs4_get_protosubver(sbi, p);
854 case AUTOFS_IOC_SETTIMEOUT:
855 return autofs4_get_set_timeout(sbi, p);
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200856#ifdef CONFIG_COMPAT
857 case AUTOFS_IOC_SETTIMEOUT32:
858 return autofs4_compat_get_set_timeout(sbi, p);
859#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 case AUTOFS_IOC_ASKUMOUNT:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800862 return autofs4_ask_umount(filp->f_path.mnt, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 /* return a single thing to expire */
865 case AUTOFS_IOC_EXPIRE:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800866 return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 /* same as above, but can send multiple expires through pipe */
868 case AUTOFS_IOC_EXPIRE_MULTI:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800869 return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871 default:
872 return -ENOSYS;
873 }
874}
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200875
876static long autofs4_root_ioctl(struct file *filp,
877 unsigned int cmd, unsigned long arg)
878{
Al Viro496ad9a2013-01-23 17:07:38 -0500879 struct inode *inode = file_inode(filp);
Ian Kentde47de72010-12-07 13:04:00 +0800880 return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200881}
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200882
883#ifdef CONFIG_COMPAT
884static long autofs4_root_compat_ioctl(struct file *filp,
885 unsigned int cmd, unsigned long arg)
886{
Al Viro496ad9a2013-01-23 17:07:38 -0500887 struct inode *inode = file_inode(filp);
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200888 int ret;
889
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200890 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
891 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
892 else
893 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd,
894 (unsigned long)compat_ptr(arg));
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200895
896 return ret;
897}
898#endif