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-rw-r--r--fs/autofs/root.c643
1 files changed, 0 insertions, 643 deletions
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
deleted file mode 100644
index 11b1ea786d00..000000000000
--- a/fs/autofs/root.c
+++ /dev/null
@@ -1,643 +0,0 @@
1/* -*- linux-c -*- --------------------------------------------------------- *
2 *
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.
10 *
11 * ------------------------------------------------------------------------- */
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>
20#include <linux/smp_lock.h>
21#include "autofs_i.h"
22
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);
30static long autofs_root_compat_ioctl(struct file *,unsigned int,unsigned long);
31
32const struct file_operations autofs_root_operations = {
33 .llseek = generic_file_llseek,
34 .read = generic_read_dir,
35 .readdir = autofs_root_readdir,
36 .unlocked_ioctl = autofs_root_ioctl,
37#ifdef CONFIG_COMPAT
38 .compat_ioctl = autofs_root_compat_ioctl,
39#endif
40};
41
42const struct inode_operations autofs_root_inode_operations = {
43 .lookup = autofs_root_lookup,
44 .unlink = autofs_root_unlink,
45 .symlink = autofs_root_symlink,
46 .mkdir = autofs_root_mkdir,
47 .rmdir = autofs_root_rmdir,
48};
49
50static int autofs_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
51{
52 struct autofs_dir_ent *ent = NULL;
53 struct autofs_dirhash *dirhash;
54 struct autofs_sb_info *sbi;
55 struct inode * inode = filp->f_path.dentry->d_inode;
56 off_t onr, nr;
57
58 lock_kernel();
59
60 sbi = autofs_sbi(inode->i_sb);
61 dirhash = &sbi->dirhash;
62 nr = filp->f_pos;
63
64 switch(nr)
65 {
66 case 0:
67 if (filldir(dirent, ".", 1, nr, inode->i_ino, DT_DIR) < 0)
68 goto out;
69 filp->f_pos = ++nr;
70 /* fall through */
71 case 1:
72 if (filldir(dirent, "..", 2, nr, inode->i_ino, DT_DIR) < 0)
73 goto out;
74 filp->f_pos = ++nr;
75 /* fall through */
76 default:
77 while (onr = nr, ent = autofs_hash_enum(dirhash,&nr,ent)) {
78 if (!ent->dentry || d_mountpoint(ent->dentry)) {
79 if (filldir(dirent,ent->name,ent->len,onr,ent->ino,DT_UNKNOWN) < 0)
80 goto out;
81 filp->f_pos = nr;
82 }
83 }
84 break;
85 }
86
87out:
88 unlock_kernel();
89 return 0;
90}
91
92static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, struct autofs_sb_info *sbi)
93{
94 struct inode * inode;
95 struct autofs_dir_ent *ent;
96 int status = 0;
97
98 if (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name))) {
99 do {
100 if (status && dentry->d_inode) {
101 if (status != -ENOENT)
102 printk("autofs warning: lookup failure on positive dentry, status = %d, name = %s\n", status, dentry->d_name.name);
103 return 0; /* Try to get the kernel to invalidate this dentry */
104 }
105
106 /* Turn this into a real negative dentry? */
107 if (status == -ENOENT) {
108 dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT;
109 dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
110 return 1;
111 } else if (status) {
112 /* Return a negative dentry, but leave it "pending" */
113 return 1;
114 }
115 status = autofs_wait(sbi, &dentry->d_name);
116 } while (!(ent = autofs_hash_lookup(&sbi->dirhash, &dentry->d_name)));
117 }
118
119 /* Abuse this field as a pointer to the directory entry, used to
120 find the expire list pointers */
121 dentry->d_time = (unsigned long) ent;
122
123 if (!dentry->d_inode) {
124 inode = autofs_iget(sb, ent->ino);
125 if (IS_ERR(inode)) {
126 /* Failed, but leave pending for next time */
127 return 1;
128 }
129 dentry->d_inode = inode;
130 }
131
132 /* If this is a directory that isn't a mount point, bitch at the
133 daemon and fix it in user space */
134 if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
135 return !autofs_wait(sbi, &dentry->d_name);
136 }
137
138 /* We don't update the usages for the autofs daemon itself, this
139 is necessary for recursive autofs mounts */
140 if (!autofs_oz_mode(sbi)) {
141 autofs_update_usage(&sbi->dirhash,ent);
142 }
143
144 dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
145 return 1;
146}
147
148
149/*
150 * Revalidate is called on every cache lookup. Some of those
151 * cache lookups may actually happen while the dentry is not
152 * yet completely filled in, and revalidate has to delay such
153 * lookups..
154 */
155static int autofs_revalidate(struct dentry * dentry, struct nameidata *nd)
156{
157 struct inode * dir;
158 struct autofs_sb_info *sbi;
159 struct autofs_dir_ent *ent;
160 int res;
161
162 lock_kernel();
163 dir = dentry->d_parent->d_inode;
164 sbi = autofs_sbi(dir->i_sb);
165
166 /* Pending dentry */
167 if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
168 if (autofs_oz_mode(sbi))
169 res = 1;
170 else
171 res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
172 unlock_kernel();
173 return res;
174 }
175
176 /* Negative dentry.. invalidate if "old" */
177 if (!dentry->d_inode) {
178 unlock_kernel();
179 return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT);
180 }
181
182 /* Check for a non-mountpoint directory */
183 if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry)) {
184 if (autofs_oz_mode(sbi))
185 res = 1;
186 else
187 res = try_to_fill_dentry(dentry, dir->i_sb, sbi);
188 unlock_kernel();
189 return res;
190 }
191
192 /* Update the usage list */
193 if (!autofs_oz_mode(sbi)) {
194 ent = (struct autofs_dir_ent *) dentry->d_time;
195 if (ent)
196 autofs_update_usage(&sbi->dirhash,ent);
197 }
198 unlock_kernel();
199 return 1;
200}
201
202static const struct dentry_operations autofs_dentry_operations = {
203 .d_revalidate = autofs_revalidate,
204};
205
206static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
207{
208 struct autofs_sb_info *sbi;
209 int oz_mode;
210
211 DPRINTK(("autofs_root_lookup: name = "));
212 lock_kernel();
213 autofs_say(dentry->d_name.name,dentry->d_name.len);
214
215 if (dentry->d_name.len > NAME_MAX) {
216 unlock_kernel();
217 return ERR_PTR(-ENAMETOOLONG);/* File name too long to exist */
218 }
219
220 sbi = autofs_sbi(dir->i_sb);
221
222 oz_mode = autofs_oz_mode(sbi);
223 DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, "
224 "oz_mode = %d\n", task_pid_nr(current),
225 task_pgrp_nr(current), sbi->catatonic,
226 oz_mode));
227
228 /*
229 * Mark the dentry incomplete, but add it. This is needed so
230 * that the VFS layer knows about the dentry, and we can count
231 * on catching any lookups through the revalidate.
232 *
233 * Let all the hard work be done by the revalidate function that
234 * needs to be able to do this anyway..
235 *
236 * We need to do this before we release the directory semaphore.
237 */
238 dentry->d_op = &autofs_dentry_operations;
239 dentry->d_flags |= DCACHE_AUTOFS_PENDING;
240 d_add(dentry, NULL);
241
242 mutex_unlock(&dir->i_mutex);
243 autofs_revalidate(dentry, nd);
244 mutex_lock(&dir->i_mutex);
245
246 /*
247 * If we are still pending, check if we had to handle
248 * a signal. If so we can force a restart..
249 */
250 if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
251 /* See if we were interrupted */
252 if (signal_pending(current)) {
253 sigset_t *sigset = &current->pending.signal;
254 if (sigismember (sigset, SIGKILL) ||
255 sigismember (sigset, SIGQUIT) ||
256 sigismember (sigset, SIGINT)) {
257 unlock_kernel();
258 return ERR_PTR(-ERESTARTNOINTR);
259 }
260 }
261 }
262 unlock_kernel();
263
264 /*
265 * If this dentry is unhashed, then we shouldn't honour this
266 * lookup even if the dentry is positive. Returning ENOENT here
267 * doesn't do the right thing for all system calls, but it should
268 * be OK for the operations we permit from an autofs.
269 */
270 if (dentry->d_inode && d_unhashed(dentry))
271 return ERR_PTR(-ENOENT);
272
273 return NULL;
274}
275
276static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
277{
278 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
279 struct autofs_dirhash *dh = &sbi->dirhash;
280 struct autofs_dir_ent *ent;
281 unsigned int n;
282 int slsize;
283 struct autofs_symlink *sl;
284 struct inode *inode;
285
286 DPRINTK(("autofs_root_symlink: %s <- ", symname));
287 autofs_say(dentry->d_name.name,dentry->d_name.len);
288
289 lock_kernel();
290 if (!autofs_oz_mode(sbi)) {
291 unlock_kernel();
292 return -EACCES;
293 }
294
295 if (autofs_hash_lookup(dh, &dentry->d_name)) {
296 unlock_kernel();
297 return -EEXIST;
298 }
299
300 n = find_first_zero_bit(sbi->symlink_bitmap,AUTOFS_MAX_SYMLINKS);
301 if (n >= AUTOFS_MAX_SYMLINKS) {
302 unlock_kernel();
303 return -ENOSPC;
304 }
305
306 set_bit(n,sbi->symlink_bitmap);
307 sl = &sbi->symlink[n];
308 sl->len = strlen(symname);
309 sl->data = kmalloc(slsize = sl->len+1, GFP_KERNEL);
310 if (!sl->data) {
311 clear_bit(n,sbi->symlink_bitmap);
312 unlock_kernel();
313 return -ENOSPC;
314 }
315
316 ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
317 if (!ent) {
318 kfree(sl->data);
319 clear_bit(n,sbi->symlink_bitmap);
320 unlock_kernel();
321 return -ENOSPC;
322 }
323
324 ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
325 if (!ent->name) {
326 kfree(sl->data);
327 kfree(ent);
328 clear_bit(n,sbi->symlink_bitmap);
329 unlock_kernel();
330 return -ENOSPC;
331 }
332
333 memcpy(sl->data,symname,slsize);
334 sl->mtime = get_seconds();
335
336 ent->ino = AUTOFS_FIRST_SYMLINK + n;
337 ent->hash = dentry->d_name.hash;
338 memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
339 ent->dentry = NULL; /* We don't keep the dentry for symlinks */
340
341 autofs_hash_insert(dh,ent);
342
343 inode = autofs_iget(dir->i_sb, ent->ino);
344 if (IS_ERR(inode))
345 return PTR_ERR(inode);
346
347 d_instantiate(dentry, inode);
348 unlock_kernel();
349 return 0;
350}
351
352/*
353 * NOTE!
354 *
355 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
356 * that the file no longer exists. However, doing that means that the
357 * VFS layer can turn the dentry into a negative dentry, which we
358 * obviously do not want (we're dropping the entry not because it
359 * doesn't exist, but because it has timed out).
360 *
361 * Also see autofs_root_rmdir()..
362 */
363static int autofs_root_unlink(struct inode *dir, struct dentry *dentry)
364{
365 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
366 struct autofs_dirhash *dh = &sbi->dirhash;
367 struct autofs_dir_ent *ent;
368 unsigned int n;
369
370 /* This allows root to remove symlinks */
371 lock_kernel();
372 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN)) {
373 unlock_kernel();
374 return -EACCES;
375 }
376
377 ent = autofs_hash_lookup(dh, &dentry->d_name);
378 if (!ent) {
379 unlock_kernel();
380 return -ENOENT;
381 }
382
383 n = ent->ino - AUTOFS_FIRST_SYMLINK;
384 if (n >= AUTOFS_MAX_SYMLINKS) {
385 unlock_kernel();
386 return -EISDIR; /* It's a directory, dummy */
387 }
388 if (!test_bit(n,sbi->symlink_bitmap)) {
389 unlock_kernel();
390 return -EINVAL; /* Nonexistent symlink? Shouldn't happen */
391 }
392
393 dentry->d_time = (unsigned long)(struct autofs_dirhash *)NULL;
394 autofs_hash_delete(ent);
395 clear_bit(n,sbi->symlink_bitmap);
396 kfree(sbi->symlink[n].data);
397 d_drop(dentry);
398
399 unlock_kernel();
400 return 0;
401}
402
403static int autofs_root_rmdir(struct inode *dir, struct dentry *dentry)
404{
405 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
406 struct autofs_dirhash *dh = &sbi->dirhash;
407 struct autofs_dir_ent *ent;
408
409 lock_kernel();
410 if (!autofs_oz_mode(sbi)) {
411 unlock_kernel();
412 return -EACCES;
413 }
414
415 ent = autofs_hash_lookup(dh, &dentry->d_name);
416 if (!ent) {
417 unlock_kernel();
418 return -ENOENT;
419 }
420
421 if ((unsigned int)ent->ino < AUTOFS_FIRST_DIR_INO) {
422 unlock_kernel();
423 return -ENOTDIR; /* Not a directory */
424 }
425
426 if (ent->dentry != dentry) {
427 printk("autofs_rmdir: odentry != dentry for entry %s\n", dentry->d_name.name);
428 }
429
430 dentry->d_time = (unsigned long)(struct autofs_dir_ent *)NULL;
431 autofs_hash_delete(ent);
432 drop_nlink(dir);
433 d_drop(dentry);
434 unlock_kernel();
435
436 return 0;
437}
438
439static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode)
440{
441 struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
442 struct autofs_dirhash *dh = &sbi->dirhash;
443 struct autofs_dir_ent *ent;
444 struct inode *inode;
445 ino_t ino;
446
447 lock_kernel();
448 if (!autofs_oz_mode(sbi)) {
449 unlock_kernel();
450 return -EACCES;
451 }
452
453 ent = autofs_hash_lookup(dh, &dentry->d_name);
454 if (ent) {
455 unlock_kernel();
456 return -EEXIST;
457 }
458
459 if (sbi->next_dir_ino < AUTOFS_FIRST_DIR_INO) {
460 printk("autofs: Out of inode numbers -- what the heck did you do??\n");
461 unlock_kernel();
462 return -ENOSPC;
463 }
464 ino = sbi->next_dir_ino++;
465
466 ent = kmalloc(sizeof(struct autofs_dir_ent), GFP_KERNEL);
467 if (!ent) {
468 unlock_kernel();
469 return -ENOSPC;
470 }
471
472 ent->name = kmalloc(dentry->d_name.len+1, GFP_KERNEL);
473 if (!ent->name) {
474 kfree(ent);
475 unlock_kernel();
476 return -ENOSPC;
477 }
478
479 ent->hash = dentry->d_name.hash;
480 memcpy(ent->name, dentry->d_name.name, 1+(ent->len = dentry->d_name.len));
481 ent->ino = ino;
482 ent->dentry = dentry;
483 autofs_hash_insert(dh,ent);
484
485 inc_nlink(dir);
486
487 inode = autofs_iget(dir->i_sb, ino);
488 if (IS_ERR(inode)) {
489 drop_nlink(dir);
490 return PTR_ERR(inode);
491 }
492
493 d_instantiate(dentry, inode);
494 unlock_kernel();
495
496 return 0;
497}
498
499/* Get/set timeout ioctl() operation */
500#ifdef CONFIG_COMPAT
501static inline int autofs_compat_get_set_timeout(struct autofs_sb_info *sbi,
502 unsigned int __user *p)
503{
504 unsigned long ntimeout;
505
506 if (get_user(ntimeout, p) ||
507 put_user(sbi->exp_timeout / HZ, p))
508 return -EFAULT;
509
510 if (ntimeout > UINT_MAX/HZ)
511 sbi->exp_timeout = 0;
512 else
513 sbi->exp_timeout = ntimeout * HZ;
514
515 return 0;
516}
517#endif
518
519static inline int autofs_get_set_timeout(struct autofs_sb_info *sbi,
520 unsigned long __user *p)
521{
522 unsigned long ntimeout;
523
524 if (get_user(ntimeout, p) ||
525 put_user(sbi->exp_timeout / HZ, p))
526 return -EFAULT;
527
528 if (ntimeout > ULONG_MAX/HZ)
529 sbi->exp_timeout = 0;
530 else
531 sbi->exp_timeout = ntimeout * HZ;
532
533 return 0;
534}
535
536/* Return protocol version */
537static inline int autofs_get_protover(int __user *p)
538{
539 return put_user(AUTOFS_PROTO_VERSION, p);
540}
541
542/* Perform an expiry operation */
543static inline int autofs_expire_run(struct super_block *sb,
544 struct autofs_sb_info *sbi,
545 struct vfsmount *mnt,
546 struct autofs_packet_expire __user *pkt_p)
547{
548 struct autofs_dir_ent *ent;
549 struct autofs_packet_expire pkt;
550
551 memset(&pkt,0,sizeof pkt);
552
553 pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;
554 pkt.hdr.type = autofs_ptype_expire;
555
556 if (!sbi->exp_timeout || !(ent = autofs_expire(sb,sbi,mnt)))
557 return -EAGAIN;
558
559 pkt.len = ent->len;
560 memcpy(pkt.name, ent->name, pkt.len);
561 pkt.name[pkt.len] = '\0';
562
563 if (copy_to_user(pkt_p, &pkt, sizeof(struct autofs_packet_expire)))
564 return -EFAULT;
565
566 return 0;
567}
568
569/*
570 * ioctl()'s on the root directory is the chief method for the daemon to
571 * generate kernel reactions
572 */
573static int autofs_do_root_ioctl(struct inode *inode, struct file *filp,
574 unsigned int cmd, unsigned long arg)
575{
576 struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
577 void __user *argp = (void __user *)arg;
578
579 DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n",cmd,arg,sbi,task_pgrp_nr(current)));
580
581 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
582 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
583 return -ENOTTY;
584
585 if (!autofs_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
586 return -EPERM;
587
588 switch(cmd) {
589 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
590 return autofs_wait_release(sbi,(autofs_wqt_t)arg,0);
591 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
592 return autofs_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
593 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
594 autofs_catatonic_mode(sbi);
595 return 0;
596 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
597 return autofs_get_protover(argp);
598#ifdef CONFIG_COMPAT
599 case AUTOFS_IOC_SETTIMEOUT32:
600 return autofs_compat_get_set_timeout(sbi, argp);
601#endif
602 case AUTOFS_IOC_SETTIMEOUT:
603 return autofs_get_set_timeout(sbi, argp);
604 case AUTOFS_IOC_EXPIRE:
605 return autofs_expire_run(inode->i_sb, sbi, filp->f_path.mnt,
606 argp);
607 default:
608 return -ENOSYS;
609 }
610
611}
612
613static long autofs_root_ioctl(struct file *filp,
614 unsigned int cmd, unsigned long arg)
615{
616 int ret;
617
618 lock_kernel();
619 ret = autofs_do_root_ioctl(filp->f_path.dentry->d_inode,
620 filp, cmd, arg);
621 unlock_kernel();
622
623 return ret;
624}
625
626#ifdef CONFIG_COMPAT
627static long autofs_root_compat_ioctl(struct file *filp,
628 unsigned int cmd, unsigned long arg)
629{
630 struct inode *inode = filp->f_path.dentry->d_inode;
631 int ret;
632
633 lock_kernel();
634 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
635 ret = autofs_do_root_ioctl(inode, filp, cmd, arg);
636 else
637 ret = autofs_do_root_ioctl(inode, filp, cmd,
638 (unsigned long)compat_ptr(arg));
639 unlock_kernel();
640
641 return ret;
642}
643#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-02 04:23:23 -0400