root.c (67577927e8d7a1f4b09b4992df640eadc6aacb36) root.c (ebc921ca9b92a3cf304d99bd7b7f373ec78c7ed7)
1/* -*- linux-c -*- --------------------------------------------------------- *
1/*
2 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
3 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
4 * Copyright 2001-2006 Ian Kent <raven@themaw.net>
2 *
5 *
3 * linux/fs/autofs/root.c
4 *
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
6 *
7 * This file is part of the Linux kernel and is made available under
8 * the terms of the GNU General Public License, version 2, or at your
9 * option, any later version, incorporated herein by reference.
6 * This file is part of the Linux kernel and is made available under
7 * the terms of the GNU General Public License, version 2, or at your
8 * option, any later version, incorporated herein by reference.
10 *
11 * ------------------------------------------------------------------------- */
9 */
12
13#include <linux/capability.h>
14#include <linux/errno.h>
15#include <linux/stat.h>
16#include <linux/slab.h>
17#include <linux/param.h>
18#include <linux/time.h>
19#include <linux/compat.h>
10
11#include <linux/capability.h>
12#include <linux/errno.h>
13#include <linux/stat.h>
14#include <linux/slab.h>
15#include <linux/param.h>
16#include <linux/time.h>
17#include <linux/compat.h>
20#include <linux/smp_lock.h>
18#include <linux/mutex.h>
19
21#include "autofs_i.h"
22
20#include "autofs_i.h"
21
23static int autofs_root_readdir(struct file *,void *,filldir_t);
24static struct dentry *autofs_root_lookup(struct inode *,struct dentry *, struct nameidata *);
25static int autofs_root_symlink(struct inode *,struct dentry *,const char *);
26static int autofs_root_unlink(struct inode *,struct dentry *);
27static int autofs_root_rmdir(struct inode *,struct dentry *);
28static int autofs_root_mkdir(struct inode *,struct dentry *,int);
29static long autofs_root_ioctl(struct file *,unsigned int,unsigned long);
22static int autofs_dir_symlink(struct inode *, struct dentry *, const char *);
23static int autofs_dir_unlink(struct inode *, struct dentry *);
24static int autofs_dir_rmdir(struct inode *, struct dentry *);
25static int autofs_dir_mkdir(struct inode *, struct dentry *, umode_t);
26static long autofs_root_ioctl(struct file *, unsigned int, unsigned long);
30#ifdef CONFIG_COMPAT
27#ifdef CONFIG_COMPAT
31static long autofs_root_compat_ioctl(struct file *,unsigned int,unsigned long);
28static long autofs_root_compat_ioctl(struct file *,
29 unsigned int, unsigned long);
32#endif
30#endif
31static int autofs_dir_open(struct inode *inode, struct file *file);
32static struct dentry *autofs_lookup(struct inode *,
33 struct dentry *, unsigned int);
34static struct vfsmount *autofs_d_automount(struct path *);
35static int autofs_d_manage(const struct path *, bool);
36static void autofs_dentry_release(struct dentry *);
33
34const struct file_operations autofs_root_operations = {
37
38const struct file_operations autofs_root_operations = {
35 .llseek = generic_file_llseek,
39 .open = dcache_dir_open,
40 .release = dcache_dir_close,
36 .read = generic_read_dir,
41 .read = generic_read_dir,
37 .readdir = autofs_root_readdir,
42 .iterate_shared = dcache_readdir,
43 .llseek = dcache_dir_lseek,
38 .unlocked_ioctl = autofs_root_ioctl,
39#ifdef CONFIG_COMPAT
40 .compat_ioctl = autofs_root_compat_ioctl,
41#endif
42};
43
44 .unlocked_ioctl = autofs_root_ioctl,
45#ifdef CONFIG_COMPAT
46 .compat_ioctl = autofs_root_compat_ioctl,
47#endif
48};
49
44const struct inode_operations autofs_root_inode_operations = {
45 .lookup = autofs_root_lookup,
46 .unlink = autofs_root_unlink,
47 .symlink = autofs_root_symlink,
48 .mkdir = autofs_root_mkdir,
49 .rmdir = autofs_root_rmdir,
50const struct file_operations autofs_dir_operations = {
51 .open = autofs_dir_open,
52 .release = dcache_dir_close,
53 .read = generic_read_dir,
54 .iterate_shared = dcache_readdir,
55 .llseek = dcache_dir_lseek,
50};
51
56};
57
52static int autofs_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
58const struct inode_operations autofs_dir_inode_operations = {
59 .lookup = autofs_lookup,
60 .unlink = autofs_dir_unlink,
61 .symlink = autofs_dir_symlink,
62 .mkdir = autofs_dir_mkdir,
63 .rmdir = autofs_dir_rmdir,
64};
65
66const struct dentry_operations autofs_dentry_operations = {
67 .d_automount = autofs_d_automount,
68 .d_manage = autofs_d_manage,
69 .d_release = autofs_dentry_release,
70};
71
72static void autofs_add_active(struct dentry *dentry)
53{
73{
54 struct autofs_dir_ent *ent = NULL;
55 struct autofs_dirhash *dirhash;
56 struct autofs_sb_info *sbi;
57 struct inode * inode = filp->f_path.dentry->d_inode;
58 off_t onr, nr;
74 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
75 struct autofs_info *ino;
59
76
60 lock_kernel();
77 ino = autofs_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}
61
88
62 sbi = autofs_sbi(inode->i_sb);
63 dirhash = &sbi->dirhash;
64 nr = filp->f_pos;
89static void autofs_del_active(struct dentry *dentry)
90{
91 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
92 struct autofs_info *ino;
65
93
66 switch(nr)
67 {
68 case 0:
69 if (filldir(dirent, ".", 1, nr, inode->i_ino, DT_DIR) < 0)
70 goto out;
71 filp->f_pos = ++nr;
72 /* fall through */
73 case 1:
74 if (filldir(dirent, "..", 2, nr, inode->i_ino, DT_DIR) < 0)
75 goto out;
76 filp->f_pos = ++nr;
77 /* fall through */
78 default:
79 while (onr = nr, ent = autofs_hash_enum(dirhash,&nr,ent)) {
80 if (!ent->dentry || d_mountpoint(ent->dentry)) {
81 if (filldir(dirent,ent->name,ent->len,onr,ent->ino,DT_UNKNOWN) < 0)
82 goto out;
83 filp->f_pos = nr;
84 }
94 ino = autofs_dentry_ino(dentry);
95 if (ino) {
96 spin_lock(&sbi->lookup_lock);
97 ino->active_count--;
98 if (!ino->active_count) {
99 if (!list_empty(&ino->active))
100 list_del_init(&ino->active);
85 }
101 }
86 break;
102 spin_unlock(&sbi->lookup_lock);
87 }
103 }
104}
88
105
106static int autofs_dir_open(struct inode *inode, struct file *file)
107{
108 struct dentry *dentry = file->f_path.dentry;
109 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
110
111 pr_debug("file=%p dentry=%p %pd\n", file, dentry, dentry);
112
113 if (autofs_oz_mode(sbi))
114 goto out;
115
116 /*
117 * An empty directory in an autofs file system is always a
118 * mount point. The daemon must have failed to mount this
119 * during lookup so it doesn't exist. This can happen, for
120 * example, if user space returns an incorrect status for a
121 * mount request. Otherwise we're doing a readdir on the
122 * autofs file system so just let the libfs routines handle
123 * it.
124 */
125 spin_lock(&sbi->lookup_lock);
126 if (!path_is_mountpoint(&file->f_path) && simple_empty(dentry)) {
127 spin_unlock(&sbi->lookup_lock);
128 return -ENOENT;
129 }
130 spin_unlock(&sbi->lookup_lock);
131
89out:
132out:
90 unlock_kernel();
91 return 0;
133 return dcache_dir_open(inode, file);
92}
93
134}
135
94static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, struct autofs_sb_info *sbi)
136static void autofs_dentry_release(struct dentry *de)
95{
137{
96 struct inode * inode;
97 struct autofs_dir_ent *ent;
98 int status = 0;
138 struct autofs_info *ino = autofs_dentry_ino(de);
139 struct autofs_sb_info *sbi = autofs_sbi(de->d_sb);
99
140
100 if (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name))) {
101 do {
102 if (status && dentry->d_inode) {
103 if (status != -ENOENT)
104 printk("autofs warning: lookup failure on positive dentry, status = %d, name = %s\n", status, dentry->d_name.name);
105 return 0; /* Try to get the kernel to invalidate this dentry */
106 }
141 pr_debug("releasing %p\n", de);
107
142
108 /* Turn this into a real negative dentry? */
109 if (status == -ENOENT) {
110 dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT;
111 dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
112 return 1;
113 } else if (status) {
114 /* Return a negative dentry, but leave it "pending" */
115 return 1;
116 }
117 status = autofs_wait(sbi, &dentry->d_name);
118 } while (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name)));
119 }
143 if (!ino)
144 return;
120
145
121 /* Abuse this field as a pointer to the directory entry, used to
122 find the expire list pointers */
123 dentry->d_time = (unsigned long) ent;
124
125 if (!dentry->d_inode) {
126 inode = autofs_iget(sb, ent->ino);
127 if (IS_ERR(inode)) {
128 /* Failed, but leave pending for next time */
129 return 1;
130 }
131 dentry->d_inode = inode;
146 if (sbi) {
147 spin_lock(&sbi->lookup_lock);
148 if (!list_empty(&ino->active))
149 list_del(&ino->active);
150 if (!list_empty(&ino->expiring))
151 list_del(&ino->expiring);
152 spin_unlock(&sbi->lookup_lock);
132 }
133
153 }
154
134 /* If this is a directory that isn't a mount point, bitch at the
135 daemon and fix it in user space */
136 if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
137 return !autofs_wait(sbi, &dentry->d_name);
138 }
155 autofs_free_ino(ino);
156}
139
157
140 /* We don't update the usages for the autofs daemon itself, this
141 is necessary for recursive autofs mounts */
142 if (!autofs_oz_mode(sbi)) {
143 autofs_update_usage(&sbi->dirhash,ent);
158static struct dentry *autofs_lookup_active(struct dentry *dentry)
159{
160 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
161 struct dentry *parent = dentry->d_parent;
162 const struct qstr *name = &dentry->d_name;
163 unsigned int len = name->len;
164 unsigned int hash = name->hash;
165 const unsigned char *str = name->name;
166 struct list_head *p, *head;
167
168 head = &sbi->active_list;
169 if (list_empty(head))
170 return NULL;
171 spin_lock(&sbi->lookup_lock);
172 list_for_each(p, head) {
173 struct autofs_info *ino;
174 struct dentry *active;
175 const struct qstr *qstr;
176
177 ino = list_entry(p, struct autofs_info, active);
178 active = ino->dentry;
179
180 spin_lock(&active->d_lock);
181
182 /* Already gone? */
183 if ((int) d_count(active) <= 0)
184 goto next;
185
186 qstr = &active->d_name;
187
188 if (active->d_name.hash != hash)
189 goto next;
190 if (active->d_parent != parent)
191 goto next;
192
193 if (qstr->len != len)
194 goto next;
195 if (memcmp(qstr->name, str, len))
196 goto next;
197
198 if (d_unhashed(active)) {
199 dget_dlock(active);
200 spin_unlock(&active->d_lock);
201 spin_unlock(&sbi->lookup_lock);
202 return active;
203 }
204next:
205 spin_unlock(&active->d_lock);
144 }
206 }
207 spin_unlock(&sbi->lookup_lock);
145
208
146 dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
147 return 1;
209 return NULL;
148}
149
210}
211
150
151/*
152 * Revalidate is called on every cache lookup. Some of those
153 * cache lookups may actually happen while the dentry is not
154 * yet completely filled in, and revalidate has to delay such
155 * lookups..
156 */
157static int autofs_revalidate(struct dentry * dentry, struct nameidata *nd)
212static struct dentry *autofs_lookup_expiring(struct dentry *dentry,
213 bool rcu_walk)
158{
214{
159 struct inode * dir;
160 struct autofs_sb_info *sbi;
161 struct autofs_dir_ent *ent;
162 int res;
215 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
216 struct dentry *parent = dentry->d_parent;
217 const struct qstr *name = &dentry->d_name;
218 unsigned int len = name->len;
219 unsigned int hash = name->hash;
220 const unsigned char *str = name->name;
221 struct list_head *p, *head;
163
222
164 lock_kernel();
165 dir = dentry->d_parent->d_inode;
166 sbi = autofs_sbi(dir->i_sb);
223 head = &sbi->expiring_list;
224 if (list_empty(head))
225 return NULL;
226 spin_lock(&sbi->lookup_lock);
227 list_for_each(p, head) {
228 struct autofs_info *ino;
229 struct dentry *expiring;
230 const struct qstr *qstr;
167
231
168 /* Pending dentry */
169 if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
170 if (autofs_oz_mode(sbi))
171 res = 1;
172 else
173 res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
174 unlock_kernel();
175 return res;
176 }
232 if (rcu_walk) {
233 spin_unlock(&sbi->lookup_lock);
234 return ERR_PTR(-ECHILD);
235 }
177
236
178 /* Negative dentry.. invalidate if "old" */
179 if (!dentry->d_inode) {
180 unlock_kernel();
181 return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT);
237 ino = list_entry(p, struct autofs_info, expiring);
238 expiring = ino->dentry;
239
240 spin_lock(&expiring->d_lock);
241
242 /* We've already been dentry_iput or unlinked */
243 if (d_really_is_negative(expiring))
244 goto next;
245
246 qstr = &expiring->d_name;
247
248 if (expiring->d_name.hash != hash)
249 goto next;
250 if (expiring->d_parent != parent)
251 goto next;
252
253 if (qstr->len != len)
254 goto next;
255 if (memcmp(qstr->name, str, len))
256 goto next;
257
258 if (d_unhashed(expiring)) {
259 dget_dlock(expiring);
260 spin_unlock(&expiring->d_lock);
261 spin_unlock(&sbi->lookup_lock);
262 return expiring;
263 }
264next:
265 spin_unlock(&expiring->d_lock);
182 }
266 }
183
184 /* Check for a non-mountpoint directory */
185 if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
186 if (autofs_oz_mode(sbi))
187 res = 1;
188 else
189 res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
190 unlock_kernel();
191 return res;
192 }
267 spin_unlock(&sbi->lookup_lock);
193
268
194 /* Update the usage list */
195 if (!autofs_oz_mode(sbi)) {
196 ent = (struct autofs_dir_ent *) dentry->d_time;
197 if (ent)
198 autofs_update_usage(&sbi->dirhash,ent);
269 return NULL;
270}
271
272static int autofs_mount_wait(const struct path *path, bool rcu_walk)
273{
274 struct autofs_sb_info *sbi = autofs_sbi(path->dentry->d_sb);
275 struct autofs_info *ino = autofs_dentry_ino(path->dentry);
276 int status = 0;
277
278 if (ino->flags & AUTOFS_INF_PENDING) {
279 if (rcu_walk)
280 return -ECHILD;
281 pr_debug("waiting for mount name=%pd\n", path->dentry);
282 status = autofs_wait(sbi, path, NFY_MOUNT);
283 pr_debug("mount wait done status=%d\n", status);
199 }
284 }
200 unlock_kernel();
201 return 1;
285 ino->last_used = jiffies;
286 return status;
202}
203
287}
288
204static const struct dentry_operations autofs_dentry_operations = {
205 .d_revalidate = autofs_revalidate,
206};
289static int do_expire_wait(const struct path *path, bool rcu_walk)
290{
291 struct dentry *dentry = path->dentry;
292 struct dentry *expiring;
207
293
208static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
294 expiring = autofs_lookup_expiring(dentry, rcu_walk);
295 if (IS_ERR(expiring))
296 return PTR_ERR(expiring);
297 if (!expiring)
298 return autofs_expire_wait(path, rcu_walk);
299 else {
300 const struct path this = { .mnt = path->mnt, .dentry = expiring };
301 /*
302 * If we are racing with expire the request might not
303 * be quite complete, but the directory has been removed
304 * so it must have been successful, just wait for it.
305 */
306 autofs_expire_wait(&this, 0);
307 autofs_del_expiring(expiring);
308 dput(expiring);
309 }
310 return 0;
311}
312
313static struct dentry *autofs_mountpoint_changed(struct path *path)
209{
314{
210 struct autofs_sb_info *sbi;
211 int oz_mode;
315 struct dentry *dentry = path->dentry;
316 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
212
317
213 DPRINTK(("autofs_root_lookup: name = "));
214 lock_kernel();
215 autofs_say(dentry->d_name.name,dentry->d_name.len);
318 /*
319 * If this is an indirect mount the dentry could have gone away
320 * as a result of an expire and a new one created.
321 */
322 if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
323 struct dentry *parent = dentry->d_parent;
324 struct autofs_info *ino;
325 struct dentry *new;
216
326
217 if (dentry->d_name.len > NAME_MAX) {
218 unlock_kernel();
219 return ERR_PTR(-ENAMETOOLONG);/* File name too long to exist */
327 new = d_lookup(parent, &dentry->d_name);
328 if (!new)
329 return NULL;
330 ino = autofs_dentry_ino(new);
331 ino->last_used = jiffies;
332 dput(path->dentry);
333 path->dentry = new;
220 }
334 }
335 return path->dentry;
336}
221
337
222 sbi = autofs_sbi(dir->i_sb);
338static struct vfsmount *autofs_d_automount(struct path *path)
339{
340 struct dentry *dentry = path->dentry;
341 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
342 struct autofs_info *ino = autofs_dentry_ino(dentry);
343 int status;
223
344
224 oz_mode = autofs_oz_mode(sbi);
225 DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, "
226 "oz_mode = %d\n", task_pid_nr(current),
227 task_pgrp_nr(current), sbi->catatonic,
228 oz_mode));
345 pr_debug("dentry=%p %pd\n", dentry, dentry);
229
346
347 /* The daemon never triggers a mount. */
348 if (autofs_oz_mode(sbi))
349 return NULL;
350
230 /*
351 /*
231 * Mark the dentry incomplete, but add it. This is needed so
232 * that the VFS layer knows about the dentry, and we can count
233 * on catching any lookups through the revalidate.
234 *
235 * Let all the hard work be done by the revalidate function that
236 * needs to be able to do this anyway..
237 *
238 * We need to do this before we release the directory semaphore.
352 * If an expire request is pending everyone must wait.
353 * If the expire fails we're still mounted so continue
354 * the follow and return. A return of -EAGAIN (which only
355 * happens with indirect mounts) means the expire completed
356 * and the directory was removed, so just go ahead and try
357 * the mount.
239 */
358 */
240 dentry->d_op = &autofs_dentry_operations;
241 dentry->d_flags |= DCACHE_AUTOFS_PENDING;
242 d_add(dentry, NULL);
359 status = do_expire_wait(path, 0);
360 if (status && status != -EAGAIN)
361 return NULL;
243
362
244 mutex_unlock(&dir->i_mutex);
245 autofs_revalidate(dentry, nd);
246 mutex_lock(&dir->i_mutex);
363 /* Callback to the daemon to perform the mount or wait */
364 spin_lock(&sbi->fs_lock);
365 if (ino->flags & AUTOFS_INF_PENDING) {
366 spin_unlock(&sbi->fs_lock);
367 status = autofs_mount_wait(path, 0);
368 if (status)
369 return ERR_PTR(status);
370 goto done;
371 }
247
248 /*
372
373 /*
249 * If we are still pending, check if we had to handle
250 * a signal. If so we can force a restart..
374 * If the dentry is a symlink it's equivalent to a directory
375 * having path_is_mountpoint() true, so there's no need to call
376 * back to the daemon.
251 */
377 */
252 if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
253 /* See if we were interrupted */
254 if (signal_pending(current)) {
255 sigset_t *sigset = &current->pending.signal;
256 if (sigismember (sigset, SIGKILL) ||
257 sigismember (sigset, SIGQUIT) ||
258 sigismember (sigset, SIGINT)) {
259 unlock_kernel();
260 return ERR_PTR(-ERESTARTNOINTR);
378 if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
379 spin_unlock(&sbi->fs_lock);
380 goto done;
381 }
382
383 if (!path_is_mountpoint(path)) {
384 /*
385 * It's possible that user space hasn't removed directories
386 * after umounting a rootless multi-mount, although it
387 * should. For v5 path_has_submounts() is sufficient to
388 * handle this because the leaves of the directory tree under
389 * the mount never trigger mounts themselves (they have an
390 * autofs trigger mount mounted on them). But v4 pseudo direct
391 * mounts do need the leaves to trigger mounts. In this case
392 * we have no choice but to use the list_empty() check and
393 * require user space behave.
394 */
395 if (sbi->version > 4) {
396 if (path_has_submounts(path)) {
397 spin_unlock(&sbi->fs_lock);
398 goto done;
261 }
399 }
400 } else {
401 if (!simple_empty(dentry)) {
402 spin_unlock(&sbi->fs_lock);
403 goto done;
404 }
262 }
405 }
406 ino->flags |= AUTOFS_INF_PENDING;
407 spin_unlock(&sbi->fs_lock);
408 status = autofs_mount_wait(path, 0);
409 spin_lock(&sbi->fs_lock);
410 ino->flags &= ~AUTOFS_INF_PENDING;
411 if (status) {
412 spin_unlock(&sbi->fs_lock);
413 return ERR_PTR(status);
414 }
263 }
415 }
264 unlock_kernel();
265
266 /*
267 * If this dentry is unhashed, then we shouldn't honour this
268 * lookup even if the dentry is positive. Returning ENOENT here
269 * doesn't do the right thing for all system calls, but it should
270 * be OK for the operations we permit from an autofs.
271 */
272 if (dentry->d_inode && d_unhashed(dentry))
416 spin_unlock(&sbi->fs_lock);
417done:
418 /* Mount succeeded, check if we ended up with a new dentry */
419 dentry = autofs_mountpoint_changed(path);
420 if (!dentry)
273 return ERR_PTR(-ENOENT);
274
275 return NULL;
276}
277
421 return ERR_PTR(-ENOENT);
422
423 return NULL;
424}
425
278static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
426static int autofs_d_manage(const struct path *path, bool rcu_walk)
279{
427{
280 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
281 struct autofs_dirhash *dh = &sbi->dirhash;
282 struct autofs_dir_ent *ent;
283 unsigned int n;
284 int slsize;
285 struct autofs_symlink *sl;
286 struct inode *inode;
428 struct dentry *dentry = path->dentry;
429 struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
430 struct autofs_info *ino = autofs_dentry_ino(dentry);
431 int status;
287
432
288 DPRINTK(("autofs_root_symlink: %s <- ", symname));
289 autofs_say(dentry->d_name.name,dentry->d_name.len);
433 pr_debug("dentry=%p %pd\n", dentry, dentry);
290
434
291 lock_kernel();
292 if (!autofs_oz_mode(sbi)) {
293 unlock_kernel();
294 return -EACCES;
435 /* The daemon never waits. */
436 if (autofs_oz_mode(sbi)) {
437 if (!path_is_mountpoint(path))
438 return -EISDIR;
439 return 0;
295 }
296
440 }
441
297 if (autofs_hash_lookup(dh, &dentry->d_name)) {
298 unlock_kernel();
299 return -EEXIST;
300 }
442 /* Wait for pending expires */
443 if (do_expire_wait(path, rcu_walk) == -ECHILD)
444 return -ECHILD;
301
445
302 n = find_first_zero_bit(sbi->symlink_bitmap,AUTOFS_MAX_SYMLINKS);
303 if (n >= AUTOFS_MAX_SYMLINKS) {
304 unlock_kernel();
305 return -ENOSPC;
306 }
446 /*
447 * This dentry may be under construction so wait on mount
448 * completion.
449 */
450 status = autofs_mount_wait(path, rcu_walk);
451 if (status)
452 return status;
307
453
308 set_bit(n,sbi->symlink_bitmap);
309 sl = &sbi->symlink[n];
310 sl->len = strlen(symname);
311 sl->data = kmalloc(slsize = sl->len+1, GFP_KERNEL);
312 if (!sl->data) {
313 clear_bit(n,sbi->symlink_bitmap);
314 unlock_kernel();
315 return -ENOSPC;
454 if (rcu_walk) {
455 /* We don't need fs_lock in rcu_walk mode,
456 * just testing 'AUTOFS_INFO_NO_RCU' is enough.
457 * simple_empty() takes a spinlock, so leave it
458 * to last.
459 * We only return -EISDIR when certain this isn't
460 * a mount-trap.
461 */
462 struct inode *inode;
463
464 if (ino->flags & AUTOFS_INF_WANT_EXPIRE)
465 return 0;
466 if (path_is_mountpoint(path))
467 return 0;
468 inode = d_inode_rcu(dentry);
469 if (inode && S_ISLNK(inode->i_mode))
470 return -EISDIR;
471 if (list_empty(&dentry->d_subdirs))
472 return 0;
473 if (!simple_empty(dentry))
474 return -EISDIR;
475 return 0;
316 }
317
476 }
477
318 ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
319 if (!ent) {
320 kfree(sl->data);
321 clear_bit(n,sbi->symlink_bitmap);
322 unlock_kernel();
323 return -ENOSPC;
478 spin_lock(&sbi->fs_lock);
479 /*
480 * If the dentry has been selected for expire while we slept
481 * on the lock then it might go away. We'll deal with that in
482 * ->d_automount() and wait on a new mount if the expire
483 * succeeds or return here if it doesn't (since there's no
484 * mount to follow with a rootless multi-mount).
485 */
486 if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
487 /*
488 * Any needed mounting has been completed and the path
489 * updated so check if this is a rootless multi-mount so
490 * we can avoid needless calls ->d_automount() and avoid
491 * an incorrect ELOOP error return.
492 */
493 if ((!path_is_mountpoint(path) && !simple_empty(dentry)) ||
494 (d_really_is_positive(dentry) && d_is_symlink(dentry)))
495 status = -EISDIR;
324 }
496 }
497 spin_unlock(&sbi->fs_lock);
325
498
326 ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
327 if (!ent->name) {
328 kfree(sl->data);
329 kfree(ent);
330 clear_bit(n,sbi->symlink_bitmap);
331 unlock_kernel();
332 return -ENOSPC;
499 return status;
500}
501
502/* Lookups in the root directory */
503static struct dentry *autofs_lookup(struct inode *dir,
504 struct dentry *dentry, unsigned int flags)
505{
506 struct autofs_sb_info *sbi;
507 struct autofs_info *ino;
508 struct dentry *active;
509
510 pr_debug("name = %pd\n", dentry);
511
512 /* File name too long to exist */
513 if (dentry->d_name.len > NAME_MAX)
514 return ERR_PTR(-ENAMETOOLONG);
515
516 sbi = autofs_sbi(dir->i_sb);
517
518 pr_debug("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n",
519 current->pid, task_pgrp_nr(current), sbi->catatonic,
520 autofs_oz_mode(sbi));
521
522 active = autofs_lookup_active(dentry);
523 if (active)
524 return active;
525 else {
526 /*
527 * A dentry that is not within the root can never trigger a
528 * mount operation, unless the directory already exists, so we
529 * can return fail immediately. The daemon however does need
530 * to create directories within the file system.
531 */
532 if (!autofs_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
533 return ERR_PTR(-ENOENT);
534
535 /* Mark entries in the root as mount triggers */
536 if (IS_ROOT(dentry->d_parent) &&
537 autofs_type_indirect(sbi->type))
538 __managed_dentry_set_managed(dentry);
539
540 ino = autofs_new_ino(sbi);
541 if (!ino)
542 return ERR_PTR(-ENOMEM);
543
544 dentry->d_fsdata = ino;
545 ino->dentry = dentry;
546
547 autofs_add_active(dentry);
333 }
548 }
549 return NULL;
550}
334
551
335 memcpy(sl->data,symname,slsize);
336 sl->mtime = get_seconds();
552static int autofs_dir_symlink(struct inode *dir,
553 struct dentry *dentry,
554 const char *symname)
555{
556 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
557 struct autofs_info *ino = autofs_dentry_ino(dentry);
558 struct autofs_info *p_ino;
559 struct inode *inode;
560 size_t size = strlen(symname);
561 char *cp;
337
562
338 ent->ino = AUTOFS_FIRST_SYMLINK + n;
339 ent->hash = dentry->d_name.hash;
340 memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
341 ent->dentry = NULL; /* We don't keep the dentry for symlinks */
563 pr_debug("%s <- %pd\n", symname, dentry);
342
564
343 autofs_hash_insert(dh,ent);
565 if (!autofs_oz_mode(sbi))
566 return -EACCES;
344
567
345 inode = autofs_iget(dir->i_sb, ent->ino);
346 if (IS_ERR(inode))
347 return PTR_ERR(inode);
568 BUG_ON(!ino);
348
569
349 d_instantiate(dentry, inode);
350 unlock_kernel();
570 autofs_clean_ino(ino);
571
572 autofs_del_active(dentry);
573
574 cp = kmalloc(size + 1, GFP_KERNEL);
575 if (!cp)
576 return -ENOMEM;
577
578 strcpy(cp, symname);
579
580 inode = autofs_get_inode(dir->i_sb, S_IFLNK | 0555);
581 if (!inode) {
582 kfree(cp);
583 return -ENOMEM;
584 }
585 inode->i_private = cp;
586 inode->i_size = size;
587 d_add(dentry, inode);
588
589 dget(dentry);
590 atomic_inc(&ino->count);
591 p_ino = autofs_dentry_ino(dentry->d_parent);
592 if (p_ino && !IS_ROOT(dentry))
593 atomic_inc(&p_ino->count);
594
595 dir->i_mtime = current_time(dir);
596
351 return 0;
352}
353
354/*
355 * NOTE!
356 *
357 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
358 * that the file no longer exists. However, doing that means that the
597 return 0;
598}
599
600/*
601 * NOTE!
602 *
603 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
604 * that the file no longer exists. However, doing that means that the
359 * VFS layer can turn the dentry into a negative dentry, which we
360 * obviously do not want (we're dropping the entry not because it
361 * doesn't exist, but because it has timed out).
605 * VFS layer can turn the dentry into a negative dentry. We don't want
606 * this, because the unlink is probably the result of an expire.
607 * We simply d_drop it and add it to a expiring list in the super block,
608 * which allows the dentry lookup to check for an incomplete expire.
362 *
609 *
363 * Also see autofs_root_rmdir()..
610 * If a process is blocked on the dentry waiting for the expire to finish,
611 * it will invalidate the dentry and try to mount with a new one.
612 *
613 * Also see autofs_dir_rmdir()..
364 */
614 */
365static int autofs_root_unlink(struct inode *dir, struct dentry *dentry)
615static int autofs_dir_unlink(struct inode *dir, struct dentry *dentry)
366{
367 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
616{
617 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
368 struct autofs_dirhash *dh = &sbi->dirhash;
369 struct autofs_dir_ent *ent;
370 unsigned int n;
618 struct autofs_info *ino = autofs_dentry_ino(dentry);
619 struct autofs_info *p_ino;
371
372 /* This allows root to remove symlinks */
620
621 /* This allows root to remove symlinks */
373 lock_kernel();
374 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) {
375 unlock_kernel();
376 return -EACCES;
377 }
622 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
623 return -EPERM;
378
624
379 ent = autofs_hash_lookup(dh, &dentry->d_name);
380 if (!ent) {
381 unlock_kernel();
382 return -ENOENT;
625 if (atomic_dec_and_test(&ino->count)) {
626 p_ino = autofs_dentry_ino(dentry->d_parent);
627 if (p_ino && !IS_ROOT(dentry))
628 atomic_dec(&p_ino->count);
383 }
629 }
630 dput(ino->dentry);
384
631
385 n = ent->ino - AUTOFS_FIRST_SYMLINK;
386 if (n >= AUTOFS_MAX_SYMLINKS) {
387 unlock_kernel();
388 return -EISDIR; /* It's a directory, dummy */
389 }
390 if (!test_bit(n,sbi->symlink_bitmap)) {
391 unlock_kernel();
392 return -EINVAL; /* Nonexistent symlink? Shouldn't happen */
393 }
394
395 dentry->d_time = (unsigned long)(struct autofs_dirhash *)NULL;
396 autofs_hash_delete(ent);
397 clear_bit(n,sbi->symlink_bitmap);
398 kfree(sbi->symlink[n].data);
632 d_inode(dentry)->i_size = 0;
633 clear_nlink(d_inode(dentry));
634
635 dir->i_mtime = current_time(dir);
636
637 spin_lock(&sbi->lookup_lock);
638 __autofs_add_expiring(dentry);
399 d_drop(dentry);
639 d_drop(dentry);
400
401 unlock_kernel();
640 spin_unlock(&sbi->lookup_lock);
641
402 return 0;
403}
404
642 return 0;
643}
644
405static int autofs_root_rmdir(struct inode *dir, struct dentry *dentry)
645/*
646 * Version 4 of autofs provides a pseudo direct mount implementation
647 * that relies on directories at the leaves of a directory tree under
648 * an indirect mount to trigger mounts. To allow for this we need to
649 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
650 * of the directory tree. There is no need to clear the automount flag
651 * following a mount or restore it after an expire because these mounts
652 * are always covered. However, it is necessary to ensure that these
653 * flags are clear on non-empty directories to avoid unnecessary calls
654 * during path walks.
655 */
656static void autofs_set_leaf_automount_flags(struct dentry *dentry)
406{
657{
658 struct dentry *parent;
659
660 /* root and dentrys in the root are already handled */
661 if (IS_ROOT(dentry->d_parent))
662 return;
663
664 managed_dentry_set_managed(dentry);
665
666 parent = dentry->d_parent;
667 /* only consider parents below dentrys in the root */
668 if (IS_ROOT(parent->d_parent))
669 return;
670 managed_dentry_clear_managed(parent);
671}
672
673static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
674{
675 struct list_head *d_child;
676 struct dentry *parent;
677
678 /* flags for dentrys in the root are handled elsewhere */
679 if (IS_ROOT(dentry->d_parent))
680 return;
681
682 managed_dentry_clear_managed(dentry);
683
684 parent = dentry->d_parent;
685 /* only consider parents below dentrys in the root */
686 if (IS_ROOT(parent->d_parent))
687 return;
688 d_child = &dentry->d_child;
689 /* Set parent managed if it's becoming empty */
690 if (d_child->next == &parent->d_subdirs &&
691 d_child->prev == &parent->d_subdirs)
692 managed_dentry_set_managed(parent);
693}
694
695static int autofs_dir_rmdir(struct inode *dir, struct dentry *dentry)
696{
407 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
697 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
408 struct autofs_dirhash *dh = &sbi->dirhash;
409 struct autofs_dir_ent *ent;
698 struct autofs_info *ino = autofs_dentry_ino(dentry);
699 struct autofs_info *p_ino;
410
700
411 lock_kernel();
412 if (!autofs_oz_mode(sbi)) {
413 unlock_kernel();
701 pr_debug("dentry %p, removing %pd\n", dentry, dentry);
702
703 if (!autofs_oz_mode(sbi))
414 return -EACCES;
704 return -EACCES;
415 }
416
705
417 ent = autofs_hash_lookup(dh, &dentry->d_name);
418 if (!ent) {
419 unlock_kernel();
420 return -ENOENT;
706 spin_lock(&sbi->lookup_lock);
707 if (!simple_empty(dentry)) {
708 spin_unlock(&sbi->lookup_lock);
709 return -ENOTEMPTY;
421 }
710 }
711 __autofs_add_expiring(dentry);
712 d_drop(dentry);
713 spin_unlock(&sbi->lookup_lock);
422
714
423 if ((unsigned int)ent->ino < AUTOFS_FIRST_DIR_INO) {
424 unlock_kernel();
425 return -ENOTDIR; /* Not a directory */
426 }
715 if (sbi->version < 5)
716 autofs_clear_leaf_automount_flags(dentry);
427
717
428 if (ent->dentry != dentry) {
429 printk("autofs_rmdir: odentry != dentry for entry %s\n", dentry->d_name.name);
718 if (atomic_dec_and_test(&ino->count)) {
719 p_ino = autofs_dentry_ino(dentry->d_parent);
720 if (p_ino && dentry->d_parent != dentry)
721 atomic_dec(&p_ino->count);
430 }
722 }
723 dput(ino->dentry);
724 d_inode(dentry)->i_size = 0;
725 clear_nlink(d_inode(dentry));
431
726
432 dentry->d_time = (unsigned long)(struct autofs_dir_ent *)NULL;
433 autofs_hash_delete(ent);
434 drop_nlink(dir);
435 d_drop(dentry);
436 unlock_kernel();
727 if (dir->i_nlink)
728 drop_nlink(dir);
437
438 return 0;
439}
440
729
730 return 0;
731}
732
441static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode)
733static int autofs_dir_mkdir(struct inode *dir,
734 struct dentry *dentry, umode_t mode)
442{
443 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
735{
736 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
444 struct autofs_dirhash *dh = &sbi->dirhash;
445 struct autofs_dir_ent *ent;
737 struct autofs_info *ino = autofs_dentry_ino(dentry);
738 struct autofs_info *p_ino;
446 struct inode *inode;
739 struct inode *inode;
447 ino_t ino;
448
740
449 lock_kernel();
450 if (!autofs_oz_mode(sbi)) {
451 unlock_kernel();
741 if (!autofs_oz_mode(sbi))
452 return -EACCES;
742 return -EACCES;
453 }
454
743
455 ent = autofs_hash_lookup(dh, &dentry->d_name);
456 if (ent) {
457 unlock_kernel();
458 return -EEXIST;
459 }
744 pr_debug("dentry %p, creating %pd\n", dentry, dentry);
460
745
461 if (sbi->next_dir_ino < AUTOFS_FIRST_DIR_INO) {
462 printk("autofs: Out of inode numbers -- what the heck did you do??\n");
463 unlock_kernel();
464 return -ENOSPC;
465 }
466 ino = sbi->next_dir_ino++;
746 BUG_ON(!ino);
467
747
468 ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
469 if (!ent) {
470 unlock_kernel();
471 return -ENOSPC;
472 }
748 autofs_clean_ino(ino);
473
749
474 ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
475 if (!ent->name) {
476 kfree(ent);
477 unlock_kernel();
478 return -ENOSPC;
479 }
750 autofs_del_active(dentry);
480
751
481 ent->hash = dentry->d_name.hash;
482 memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
483 ent->ino = ino;
484 ent->dentry = dentry;
485 autofs_hash_insert(dh,ent);
752 inode = autofs_get_inode(dir->i_sb, S_IFDIR | mode);
753 if (!inode)
754 return -ENOMEM;
755 d_add(dentry, inode);
486
756
757 if (sbi->version < 5)
758 autofs_set_leaf_automount_flags(dentry);
759
760 dget(dentry);
761 atomic_inc(&ino->count);
762 p_ino = autofs_dentry_ino(dentry->d_parent);
763 if (p_ino && !IS_ROOT(dentry))
764 atomic_inc(&p_ino->count);
487 inc_nlink(dir);
765 inc_nlink(dir);
766 dir->i_mtime = current_time(dir);
488
767
489 inode = autofs_iget(dir->i_sb, ino);
490 if (IS_ERR(inode)) {
491 drop_nlink(dir);
492 return PTR_ERR(inode);
493 }
494
495 d_instantiate(dentry, inode);
496 unlock_kernel();
497
498 return 0;
499}
500
501/* Get/set timeout ioctl() operation */
502#ifdef CONFIG_COMPAT
503static inline int autofs_compat_get_set_timeout(struct autofs_sb_info *sbi,
768 return 0;
769}
770
771/* Get/set timeout ioctl() operation */
772#ifdef CONFIG_COMPAT
773static inline int autofs_compat_get_set_timeout(struct autofs_sb_info *sbi,
504 unsigned int __user *p)
774 compat_ulong_t __user *p)
505{
506 unsigned long ntimeout;
775{
776 unsigned long ntimeout;
777 int rv;
507
778
508 if (get_user(ntimeout, p) ||
509 put_user(sbi->exp_timeout / HZ, p))
510 return -EFAULT;
779 rv = get_user(ntimeout, p);
780 if (rv)
781 goto error;
511
782
783 rv = put_user(sbi->exp_timeout/HZ, p);
784 if (rv)
785 goto error;
786
512 if (ntimeout > UINT_MAX/HZ)
513 sbi->exp_timeout = 0;
514 else
515 sbi->exp_timeout = ntimeout * HZ;
516
517 return 0;
787 if (ntimeout > UINT_MAX/HZ)
788 sbi->exp_timeout = 0;
789 else
790 sbi->exp_timeout = ntimeout * HZ;
791
792 return 0;
793error:
794 return rv;
518}
519#endif
520
521static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
795}
796#endif
797
798static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
522 unsigned long __user *p)
799 unsigned long __user *p)
523{
524 unsigned long ntimeout;
800{
801 unsigned long ntimeout;
802 int rv;
525
803
526 if (get_user(ntimeout, p) ||
527 put_user(sbi->exp_timeout / HZ, p))
528 return -EFAULT;
804 rv = get_user(ntimeout, p);
805 if (rv)
806 goto error;
529
807
808 rv = put_user(sbi->exp_timeout/HZ, p);
809 if (rv)
810 goto error;
811
530 if (ntimeout > ULONG_MAX/HZ)
531 sbi->exp_timeout = 0;
532 else
533 sbi->exp_timeout = ntimeout * HZ;
534
535 return 0;
812 if (ntimeout > ULONG_MAX/HZ)
813 sbi->exp_timeout = 0;
814 else
815 sbi->exp_timeout = ntimeout * HZ;
816
817 return 0;
818error:
819 return rv;
536}
537
538/* Return protocol version */
820}
821
822/* Return protocol version */
539static inline int autofs_get_protover(int __user *p)
823static inline int autofs_get_protover(struct autofs_sb_info *sbi,
824 int __user *p)
540{
825{
541 return put_user(AUTOFS_PROTO_VERSION, p);
826 return put_user(sbi->version, p);
542}
543
827}
828
544/* Perform an expiry operation */
545static inline int autofs_expire_run(struct super_block *sb,
546 struct autofs_sb_info *sbi,
547 struct vfsmount *mnt,
548 struct autofs_packet_expire __user *pkt_p)
829/* Return protocol sub version */
830static inline int autofs_get_protosubver(struct autofs_sb_info *sbi,
831 int __user *p)
549{
832{
550 struct autofs_dir_ent *ent;
551 struct autofs_packet_expire pkt;
833 return put_user(sbi->sub_version, p);
834}
552
835
553 memset(&pkt,0,sizeof pkt);
836/*
837* Tells the daemon whether it can umount the autofs mount.
838*/
839static inline int autofs_ask_umount(struct vfsmount *mnt, int __user *p)
840{
841 int status = 0;
554
842
555 pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;
556 pkt.hdr.type = autofs_ptype_expire;
843 if (may_umount(mnt))
844 status = 1;
557
845
558 if (!sbi->exp_timeout || !(ent = autofs_expire(sb,sbi,mnt)))
559 return -EAGAIN;
846 pr_debug("may umount %d\n", status);
560
847
561 pkt.len = ent->len;
562 memcpy(pkt.name, ent->name, pkt.len);
563 pkt.name[pkt.len] = '\0';
848 status = put_user(status, p);
564
849
565 if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)))
566 return -EFAULT;
850 return status;
851}
567
852
568 return 0;
853/* Identify autofs_dentries - this is so we can tell if there's
854 * an extra dentry refcount or not. We only hold a refcount on the
855 * dentry if its non-negative (ie, d_inode != NULL)
856 */
857int is_autofs_dentry(struct dentry *dentry)
858{
859 return dentry && d_really_is_positive(dentry) &&
860 dentry->d_op == &autofs_dentry_operations &&
861 dentry->d_fsdata != NULL;
569}
570
571/*
572 * ioctl()'s on the root directory is the chief method for the daemon to
573 * generate kernel reactions
574 */
862}
863
864/*
865 * ioctl()'s on the root directory is the chief method for the daemon to
866 * generate kernel reactions
867 */
575static int autofs_do_root_ioctl(struct inode *inode, struct file *filp,
576 unsigned int cmd, unsigned long arg)
868static int autofs_root_ioctl_unlocked(struct inode *inode, struct file *filp,
869 unsigned int cmd, unsigned long arg)
577{
578 struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
870{
871 struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
579 void __user *argp = (void __user *)arg;
872 void __user *p = (void __user *)arg;
580
873
581 DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,task_pgrp_nr(current)));
874 pr_debug("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",
875 cmd, arg, sbi, task_pgrp_nr(current));
582
583 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
584 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
585 return -ENOTTY;
876
877 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
878 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
879 return -ENOTTY;
586
880
587 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
588 return -EPERM;
881 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
882 return -EPERM;
589
590 switch(cmd) {
883
884 switch (cmd) {
591 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
885 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
592 return autofs_wait_release(sbi,(autofs_wqt_t)arg,0);
886 return autofs_wait_release(sbi, (autofs_wqt_t) arg, 0);
593 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
887 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
594 return autofs_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
888 return autofs_wait_release(sbi, (autofs_wqt_t) arg, -ENOENT);
595 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
596 autofs_catatonic_mode(sbi);
597 return 0;
598 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
889 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
890 autofs_catatonic_mode(sbi);
891 return 0;
892 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
599 return autofs_get_protover(argp);
893 return autofs_get_protover(sbi, p);
894 case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
895 return autofs_get_protosubver(sbi, p);
896 case AUTOFS_IOC_SETTIMEOUT:
897 return autofs_get_set_timeout(sbi, p);
600#ifdef CONFIG_COMPAT
601 case AUTOFS_IOC_SETTIMEOUT32:
898#ifdef CONFIG_COMPAT
899 case AUTOFS_IOC_SETTIMEOUT32:
602 return autofs_compat_get_set_timeout(sbi, argp);
900 return autofs_compat_get_set_timeout(sbi, p);
603#endif
901#endif
604 case AUTOFS_IOC_SETTIMEOUT:
605 return autofs_get_set_timeout(sbi, argp);
902
903 case AUTOFS_IOC_ASKUMOUNT:
904 return autofs_ask_umount(filp->f_path.mnt, p);
905
906 /* return a single thing to expire */
606 case AUTOFS_IOC_EXPIRE:
907 case AUTOFS_IOC_EXPIRE:
607 return autofs_expire_run(inode->i_sb, sbi, filp->f_path.mnt,
608 argp);
908 return autofs_expire_run(inode->i_sb, filp->f_path.mnt, sbi, p);
909 /* same as above, but can send multiple expires through pipe */
910 case AUTOFS_IOC_EXPIRE_MULTI:
911 return autofs_expire_multi(inode->i_sb,
912 filp->f_path.mnt, sbi, p);
913
609 default:
914 default:
610 return -ENOSYS;
915 return -EINVAL;
611 }
916 }
612
613}
614
615static long autofs_root_ioctl(struct file *filp,
917}
918
919static long autofs_root_ioctl(struct file *filp,
616 unsigned int cmd, unsigned long arg)
920 unsigned int cmd, unsigned long arg)
617{
921{
618 int ret;
922 struct inode *inode = file_inode(filp);
619
923
620 lock_kernel();
621 ret = autofs_do_root_ioctl(filp->f_path.dentry->d_inode,
622 filp, cmd, arg);
623 unlock_kernel();
624
625 return ret;
924 return autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
626}
627
628#ifdef CONFIG_COMPAT
629static long autofs_root_compat_ioctl(struct file *filp,
925}
926
927#ifdef CONFIG_COMPAT
928static long autofs_root_compat_ioctl(struct file *filp,
630 unsigned int cmd, unsigned long arg)
929 unsigned int cmd, unsigned long arg)
631{
930{
632 struct inode *inode = filp->f_path.dentry->d_inode;
931 struct inode *inode = file_inode(filp);
633 int ret;
634
932 int ret;
933
635 lock_kernel();
636 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
934 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
637 ret = autofs_do_root_ioctl(inode, filp, cmd, arg);
935 ret = autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
638 else
936 else
639 ret = autofs_do_root_ioctl(inode, filp, cmd,
640 (unsigned long)compat_ptr(arg));
641 unlock_kernel();
937 ret = autofs_root_ioctl_unlocked(inode, filp, cmd,
938 (unsigned long) compat_ptr(arg));
642
643 return ret;
644}
645#endif
939
940 return ret;
941}
942#endif