blob: c93447604da859bf5b3de0435c4d26852811bb95 [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,
Ian Kentaa55ddf2008-07-23 21:30:29 -070044 .readdir = 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,
Ian Kentff9cd492008-07-23 21:30:24 -070056 .readdir = 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? */
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100182 if (active->d_count == 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
233 /* Bad luck, we've already been dentry_iput */
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 {
Ian Kent0259cb02012-12-14 10:23:29 +0800386 if (!simple_empty(dentry))
Ian Kentb5b80172011-01-14 18:46:03 +0000387 goto done;
Ian Kentb5b80172011-01-14 18:46:03 +0000388 }
Ian Kent10584212011-01-14 18:45:58 +0000389 ino->flags |= AUTOFS_INF_PENDING;
Ian Kent10584212011-01-14 18:45:58 +0000390 spin_unlock(&sbi->fs_lock);
391 status = autofs4_mount_wait(dentry);
Ian Kent10584212011-01-14 18:45:58 +0000392 spin_lock(&sbi->fs_lock);
393 ino->flags &= ~AUTOFS_INF_PENDING;
Ian Kent49999ab2012-10-11 08:00:33 +0800394 if (status) {
395 spin_unlock(&sbi->fs_lock);
396 return ERR_PTR(status);
397 }
Ian Kent10584212011-01-14 18:45:58 +0000398 }
Ian Kent10584212011-01-14 18:45:58 +0000399 spin_unlock(&sbi->fs_lock);
Ian Kentf55fb0c2012-12-14 10:23:23 +0800400done:
Ian Kent10584212011-01-14 18:45:58 +0000401 /* Mount succeeded, check if we ended up with a new dentry */
402 dentry = autofs4_mountpoint_changed(path);
403 if (!dentry)
404 return ERR_PTR(-ENOENT);
405
406 return NULL;
407}
408
Al Viro1aed3e42011-03-18 09:09:02 -0400409int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
Ian Kentb5b80172011-01-14 18:46:03 +0000410{
411 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
Ian Kentf55fb0c2012-12-14 10:23:23 +0800412 struct autofs_info *ino = autofs4_dentry_ino(dentry);
413 int status;
Ian Kentb5b80172011-01-14 18:46:03 +0000414
415 DPRINTK("dentry=%p %.*s",
416 dentry, dentry->d_name.len, dentry->d_name.name);
417
418 /* The daemon never waits. */
Al Viro1aed3e42011-03-18 09:09:02 -0400419 if (autofs4_oz_mode(sbi)) {
Ian Kent83fb96b2011-03-25 01:51:25 +0800420 if (rcu_walk)
421 return 0;
Ian Kentb5b80172011-01-14 18:46:03 +0000422 if (!d_mountpoint(dentry))
423 return -EISDIR;
424 return 0;
425 }
426
David Howellsab909112011-01-14 18:46:51 +0000427 /* We need to sleep, so we need pathwalk to be in ref-mode */
428 if (rcu_walk)
429 return -ECHILD;
430
Ian Kentb5b80172011-01-14 18:46:03 +0000431 /* Wait for pending expires */
432 do_expire_wait(dentry);
433
434 /*
435 * This dentry may be under construction so wait on mount
436 * completion.
437 */
Ian Kentf55fb0c2012-12-14 10:23:23 +0800438 status = autofs4_mount_wait(dentry);
439 if (status)
440 return status;
441
442 spin_lock(&sbi->fs_lock);
443 /*
444 * If the dentry has been selected for expire while we slept
445 * on the lock then it might go away. We'll deal with that in
446 * ->d_automount() and wait on a new mount if the expire
447 * succeeds or return here if it doesn't (since there's no
448 * mount to follow with a rootless multi-mount).
449 */
450 if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
451 /*
452 * Any needed mounting has been completed and the path
453 * updated so check if this is a rootless multi-mount so
454 * we can avoid needless calls ->d_automount() and avoid
455 * an incorrect ELOOP error return.
456 */
457 if ((!d_mountpoint(dentry) && !simple_empty(dentry)) ||
458 (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
459 status = -EISDIR;
460 }
461 spin_unlock(&sbi->fs_lock);
462
463 return status;
Ian Kentb5b80172011-01-14 18:46:03 +0000464}
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466/* Lookups in the root directory */
Al Viro00cd8dd2012-06-10 17:13:09 -0400467static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
469 struct autofs_sb_info *sbi;
Ian Kent25767372008-07-23 21:30:12 -0700470 struct autofs_info *ino;
Ian Kent10584212011-01-14 18:45:58 +0000471 struct dentry *active;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
Ian Kent10584212011-01-14 18:45:58 +0000473 DPRINTK("name = %.*s", dentry->d_name.len, dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Ian Kent718c6042006-03-27 01:14:42 -0800475 /* File name too long to exist */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 if (dentry->d_name.len > NAME_MAX)
Ian Kent718c6042006-03-27 01:14:42 -0800477 return ERR_PTR(-ENAMETOOLONG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 sbi = autofs4_sbi(dir->i_sb);
Ian Kent718c6042006-03-27 01:14:42 -0800480
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
Ian Kentc0bcc9d2011-01-18 12:06:15 +0800482 current->pid, task_pgrp_nr(current), sbi->catatonic,
483 autofs4_oz_mode(sbi));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Ian Kent6510c9d2009-12-15 16:45:47 -0800485 active = autofs4_lookup_active(dentry);
Ian Kent90387c92009-12-15 16:45:46 -0800486 if (active) {
Ian Kent10584212011-01-14 18:45:58 +0000487 return active;
Ian Kentaa952eb2009-12-15 16:45:45 -0800488 } else {
Al Viro4b1ae272010-03-03 12:58:31 -0500489 /*
Ian Kent10584212011-01-14 18:45:58 +0000490 * A dentry that is not within the root can never trigger a
491 * mount operation, unless the directory already exists, so we
492 * can return fail immediately. The daemon however does need
493 * to create directories within the file system.
Al Viro4b1ae272010-03-03 12:58:31 -0500494 */
Ian Kent10584212011-01-14 18:45:58 +0000495 if (!autofs4_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
496 return ERR_PTR(-ENOENT);
497
498 /* Mark entries in the root as mount triggers */
David Howellsb650c852011-01-15 10:51:57 +0000499 if (autofs_type_indirect(sbi->type) && IS_ROOT(dentry->d_parent))
Ian Kentb5b80172011-01-14 18:46:03 +0000500 __managed_dentry_set_managed(dentry);
Ian Kent10584212011-01-14 18:45:58 +0000501
Al Viro26e6c912011-01-16 18:43:40 -0500502 ino = autofs4_new_ino(sbi);
Al Viro4b1ae272010-03-03 12:58:31 -0500503 if (!ino)
504 return ERR_PTR(-ENOMEM);
505
506 dentry->d_fsdata = ino;
507 ino->dentry = dentry;
508
509 autofs4_add_active(dentry);
510
511 d_instantiate(dentry, NULL);
Ian Kent25767372008-07-23 21:30:12 -0700512 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 return NULL;
514}
515
516static int autofs4_dir_symlink(struct inode *dir,
517 struct dentry *dentry,
518 const char *symname)
519{
520 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
521 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800522 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 struct inode *inode;
Al Viro0bf71d42011-01-16 17:39:15 -0500524 size_t size = strlen(symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 char *cp;
526
527 DPRINTK("%s <- %.*s", symname,
528 dentry->d_name.len, dentry->d_name.name);
529
530 if (!autofs4_oz_mode(sbi))
531 return -EACCES;
532
Al Viro5a37db32011-01-16 18:29:35 -0500533 BUG_ON(!ino);
534
Al Viro26e6c912011-01-16 18:43:40 -0500535 autofs4_clean_ino(ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Al Viro4b1ae272010-03-03 12:58:31 -0500537 autofs4_del_active(dentry);
538
Al Viro0bf71d42011-01-16 17:39:15 -0500539 cp = kmalloc(size + 1, GFP_KERNEL);
Al Viro5a37db32011-01-16 18:29:35 -0500540 if (!cp)
Ian Kent25767372008-07-23 21:30:12 -0700541 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 strcpy(cp, symname);
544
Al Viro726a5e02011-01-16 17:43:52 -0500545 inode = autofs4_get_inode(dir->i_sb, S_IFLNK | 0555);
Ian Kent25767372008-07-23 21:30:12 -0700546 if (!inode) {
547 kfree(cp);
548 if (!dentry->d_fsdata)
549 kfree(ino);
550 return -ENOMEM;
551 }
Al Viro292c5ee2011-01-17 00:47:38 -0500552 inode->i_private = cp;
Al Viro0bf71d42011-01-16 17:39:15 -0500553 inode->i_size = size;
Ian Kent1864f7b2007-08-22 14:01:54 -0700554 d_add(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Al Viro5a37db32011-01-16 18:29:35 -0500556 dget(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800557 atomic_inc(&ino->count);
558 p_ino = autofs4_dentry_ino(dentry->d_parent);
559 if (p_ino && dentry->d_parent != dentry)
560 atomic_inc(&p_ino->count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 dir->i_mtime = CURRENT_TIME;
563
564 return 0;
565}
566
567/*
568 * NOTE!
569 *
570 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
571 * that the file no longer exists. However, doing that means that the
572 * VFS layer can turn the dentry into a negative dentry. We don't want
Ian Kentf50b6f82007-02-20 13:58:10 -0800573 * this, because the unlink is probably the result of an expire.
Ian Kent5f6f4f22008-07-23 21:30:09 -0700574 * We simply d_drop it and add it to a expiring list in the super block,
575 * which allows the dentry lookup to check for an incomplete expire.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 *
577 * If a process is blocked on the dentry waiting for the expire to finish,
578 * it will invalidate the dentry and try to mount with a new one.
579 *
580 * Also see autofs4_dir_rmdir()..
581 */
582static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
583{
584 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
585 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800586 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 /* This allows root to remove symlinks */
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700589 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 return -EACCES;
591
Ian Kent1aff3c82006-03-27 01:14:46 -0800592 if (atomic_dec_and_test(&ino->count)) {
593 p_ino = autofs4_dentry_ino(dentry->d_parent);
594 if (p_ino && dentry->d_parent != dentry)
595 atomic_dec(&p_ino->count);
596 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 dput(ino->dentry);
598
599 dentry->d_inode->i_size = 0;
Dave Hansence71ec32006-09-30 23:29:06 -0700600 clear_nlink(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
602 dir->i_mtime = CURRENT_TIME;
603
Ian Kente7854722011-03-25 01:51:31 +0800604 spin_lock(&sbi->lookup_lock);
605 __autofs4_add_expiring(dentry);
Ian Kent0259cb02012-12-14 10:23:29 +0800606 d_drop(dentry);
Ian Kente7854722011-03-25 01:51:31 +0800607 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 return 0;
610}
611
Ian Kentdd89f902011-01-14 18:46:35 +0000612/*
613 * Version 4 of autofs provides a pseudo direct mount implementation
614 * that relies on directories at the leaves of a directory tree under
615 * an indirect mount to trigger mounts. To allow for this we need to
616 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
617 * of the directory tree. There is no need to clear the automount flag
618 * following a mount or restore it after an expire because these mounts
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300619 * are always covered. However, it is necessary to ensure that these
Ian Kentdd89f902011-01-14 18:46:35 +0000620 * flags are clear on non-empty directories to avoid unnecessary calls
621 * during path walks.
622 */
623static void autofs_set_leaf_automount_flags(struct dentry *dentry)
624{
625 struct dentry *parent;
626
627 /* root and dentrys in the root are already handled */
628 if (IS_ROOT(dentry->d_parent))
629 return;
630
631 managed_dentry_set_managed(dentry);
632
633 parent = dentry->d_parent;
634 /* only consider parents below dentrys in the root */
635 if (IS_ROOT(parent->d_parent))
636 return;
637 managed_dentry_clear_managed(parent);
638 return;
639}
640
641static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
642{
643 struct list_head *d_child;
644 struct dentry *parent;
645
646 /* flags for dentrys in the root are handled elsewhere */
647 if (IS_ROOT(dentry->d_parent))
648 return;
649
650 managed_dentry_clear_managed(dentry);
651
652 parent = dentry->d_parent;
653 /* only consider parents below dentrys in the root */
654 if (IS_ROOT(parent->d_parent))
655 return;
656 d_child = &dentry->d_u.d_child;
657 /* Set parent managed if it's becoming empty */
658 if (d_child->next == &parent->d_subdirs &&
659 d_child->prev == &parent->d_subdirs)
660 managed_dentry_set_managed(parent);
661 return;
662}
663
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
665{
666 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
667 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800668 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Ian Kentf50b6f82007-02-20 13:58:10 -0800670 DPRINTK("dentry %p, removing %.*s",
671 dentry, dentry->d_name.len, dentry->d_name.name);
672
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 if (!autofs4_oz_mode(sbi))
674 return -EACCES;
675
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100676 spin_lock(&sbi->lookup_lock);
Ian Kent0259cb02012-12-14 10:23:29 +0800677 if (!simple_empty(dentry)) {
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100678 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 return -ENOTEMPTY;
680 }
Nick Piggin2fd6b7f2011-01-07 17:49:34 +1100681 __autofs4_add_expiring(dentry);
Ian Kent0259cb02012-12-14 10:23:29 +0800682 d_drop(dentry);
Ian Kente7854722011-03-25 01:51:31 +0800683 spin_unlock(&sbi->lookup_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Ian Kentdd89f902011-01-14 18:46:35 +0000685 if (sbi->version < 5)
686 autofs_clear_leaf_automount_flags(dentry);
687
Ian Kent1aff3c82006-03-27 01:14:46 -0800688 if (atomic_dec_and_test(&ino->count)) {
689 p_ino = autofs4_dentry_ino(dentry->d_parent);
690 if (p_ino && dentry->d_parent != dentry)
691 atomic_dec(&p_ino->count);
692 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 dput(ino->dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 dentry->d_inode->i_size = 0;
Dave Hansence71ec32006-09-30 23:29:06 -0700695 clear_nlink(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 if (dir->i_nlink)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700698 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 return 0;
701}
702
Al Viro18bb1db2011-07-26 01:41:39 -0400703static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704{
705 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
706 struct autofs_info *ino = autofs4_dentry_ino(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800707 struct autofs_info *p_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 struct inode *inode;
709
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700710 if (!autofs4_oz_mode(sbi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 return -EACCES;
712
713 DPRINTK("dentry %p, creating %.*s",
714 dentry, dentry->d_name.len, dentry->d_name.name);
715
Al Viro5a37db32011-01-16 18:29:35 -0500716 BUG_ON(!ino);
717
Al Viro26e6c912011-01-16 18:43:40 -0500718 autofs4_clean_ino(ino);
Ian Kent25767372008-07-23 21:30:12 -0700719
Al Viro4b1ae272010-03-03 12:58:31 -0500720 autofs4_del_active(dentry);
721
Al Viro726a5e02011-01-16 17:43:52 -0500722 inode = autofs4_get_inode(dir->i_sb, S_IFDIR | 0555);
Al Viro5a37db32011-01-16 18:29:35 -0500723 if (!inode)
Ian Kent25767372008-07-23 21:30:12 -0700724 return -ENOMEM;
Ian Kent1864f7b2007-08-22 14:01:54 -0700725 d_add(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
Ian Kentdd89f902011-01-14 18:46:35 +0000727 if (sbi->version < 5)
728 autofs_set_leaf_automount_flags(dentry);
729
Al Viro5a37db32011-01-16 18:29:35 -0500730 dget(dentry);
Ian Kent1aff3c82006-03-27 01:14:46 -0800731 atomic_inc(&ino->count);
732 p_ino = autofs4_dentry_ino(dentry->d_parent);
733 if (p_ino && dentry->d_parent != dentry)
734 atomic_inc(&p_ino->count);
Dave Hansend8c76e62006-09-30 23:29:04 -0700735 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 dir->i_mtime = CURRENT_TIME;
737
738 return 0;
739}
740
741/* Get/set timeout ioctl() operation */
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200742#ifdef CONFIG_COMPAT
743static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi,
744 compat_ulong_t __user *p)
745{
746 int rv;
747 unsigned long ntimeout;
748
749 if ((rv = get_user(ntimeout, p)) ||
750 (rv = put_user(sbi->exp_timeout/HZ, p)))
751 return rv;
752
753 if (ntimeout > UINT_MAX/HZ)
754 sbi->exp_timeout = 0;
755 else
756 sbi->exp_timeout = ntimeout * HZ;
757
758 return 0;
759}
760#endif
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
763 unsigned long __user *p)
764{
765 int rv;
766 unsigned long ntimeout;
767
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700768 if ((rv = get_user(ntimeout, p)) ||
769 (rv = put_user(sbi->exp_timeout/HZ, p)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 return rv;
771
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700772 if (ntimeout > ULONG_MAX/HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 sbi->exp_timeout = 0;
774 else
775 sbi->exp_timeout = ntimeout * HZ;
776
777 return 0;
778}
779
780/* Return protocol version */
781static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p)
782{
783 return put_user(sbi->version, p);
784}
785
786/* Return protocol sub version */
787static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p)
788{
789 return put_user(sbi->sub_version, p);
790}
791
792/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793* Tells the daemon whether it can umount the autofs mount.
794*/
795static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
796{
797 int status = 0;
798
Ian Kente3474a82006-03-27 01:14:51 -0800799 if (may_umount(mnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 status = 1;
801
802 DPRINTK("returning %d", status);
803
804 status = put_user(status, p);
805
806 return status;
807}
808
809/* Identify autofs4_dentries - this is so we can tell if there's
810 an extra dentry refcount or not. We only hold a refcount on the
811 dentry if its non-negative (ie, d_inode != NULL)
812*/
813int is_autofs4_dentry(struct dentry *dentry)
814{
815 return dentry && dentry->d_inode &&
David Howellsb650c852011-01-15 10:51:57 +0000816 dentry->d_op == &autofs4_dentry_operations &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 dentry->d_fsdata != NULL;
818}
819
820/*
821 * ioctl()'s on the root directory is the chief method for the daemon to
822 * generate kernel reactions
823 */
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200824static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
825 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826{
827 struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
828 void __user *p = (void __user *)arg;
829
830 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
Pavel Emelianova47afb02007-10-18 23:39:46 -0700831 cmd,arg,sbi,task_pgrp_nr(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700833 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
834 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 return -ENOTTY;
836
Sukadev Bhattiprolud78e53c2007-05-10 22:23:06 -0700837 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 return -EPERM;
839
840 switch(cmd) {
841 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
842 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0);
843 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
844 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
845 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
846 autofs4_catatonic_mode(sbi);
847 return 0;
848 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
849 return autofs4_get_protover(sbi, p);
850 case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
851 return autofs4_get_protosubver(sbi, p);
852 case AUTOFS_IOC_SETTIMEOUT:
853 return autofs4_get_set_timeout(sbi, p);
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200854#ifdef CONFIG_COMPAT
855 case AUTOFS_IOC_SETTIMEOUT32:
856 return autofs4_compat_get_set_timeout(sbi, p);
857#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 case AUTOFS_IOC_ASKUMOUNT:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800860 return autofs4_ask_umount(filp->f_path.mnt, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 /* return a single thing to expire */
863 case AUTOFS_IOC_EXPIRE:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800864 return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 /* same as above, but can send multiple expires through pipe */
866 case AUTOFS_IOC_EXPIRE_MULTI:
Josef "Jeff" Sipeka4669ed2006-12-08 02:36:46 -0800867 return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 default:
870 return -ENOSYS;
871 }
872}
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200873
874static long autofs4_root_ioctl(struct file *filp,
875 unsigned int cmd, unsigned long arg)
876{
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200877 struct inode *inode = filp->f_dentry->d_inode;
Ian Kentde47de72010-12-07 13:04:00 +0800878 return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
Frederic Weisbecker3663df72010-05-19 15:08:17 +0200879}
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200880
881#ifdef CONFIG_COMPAT
882static long autofs4_root_compat_ioctl(struct file *filp,
883 unsigned int cmd, unsigned long arg)
884{
885 struct inode *inode = filp->f_path.dentry->d_inode;
886 int ret;
887
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200888 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
889 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
890 else
891 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd,
892 (unsigned long)compat_ptr(arg));
Arnd Bergmannc9243f52010-07-04 00:15:07 +0200893
894 return ret;
895}
896#endif