Loading...
1/*
2 * ioctl.c - NILFS ioctl operations.
3 *
4 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>.
21 */
22
23#include <linux/fs.h>
24#include <linux/wait.h>
25#include <linux/slab.h>
26#include <linux/capability.h> /* capable() */
27#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
28#include <linux/vmalloc.h>
29#include <linux/compat.h> /* compat_ptr() */
30#include <linux/mount.h> /* mnt_want_write(), mnt_drop_write() */
31#include <linux/buffer_head.h>
32#include <linux/nilfs2_fs.h>
33#include "nilfs.h"
34#include "segment.h"
35#include "bmap.h"
36#include "cpfile.h"
37#include "sufile.h"
38#include "dat.h"
39
40
41static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
42 struct nilfs_argv *argv, int dir,
43 ssize_t (*dofunc)(struct the_nilfs *,
44 __u64 *, int,
45 void *, size_t, size_t))
46{
47 void *buf;
48 void __user *base = (void __user *)(unsigned long)argv->v_base;
49 size_t maxmembs, total, n;
50 ssize_t nr;
51 int ret, i;
52 __u64 pos, ppos;
53
54 if (argv->v_nmembs == 0)
55 return 0;
56
57 if (argv->v_size > PAGE_SIZE)
58 return -EINVAL;
59
60 buf = (void *)__get_free_pages(GFP_NOFS, 0);
61 if (unlikely(!buf))
62 return -ENOMEM;
63 maxmembs = PAGE_SIZE / argv->v_size;
64
65 ret = 0;
66 total = 0;
67 pos = argv->v_index;
68 for (i = 0; i < argv->v_nmembs; i += n) {
69 n = (argv->v_nmembs - i < maxmembs) ?
70 argv->v_nmembs - i : maxmembs;
71 if ((dir & _IOC_WRITE) &&
72 copy_from_user(buf, base + argv->v_size * i,
73 argv->v_size * n)) {
74 ret = -EFAULT;
75 break;
76 }
77 ppos = pos;
78 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
79 n);
80 if (nr < 0) {
81 ret = nr;
82 break;
83 }
84 if ((dir & _IOC_READ) &&
85 copy_to_user(base + argv->v_size * i, buf,
86 argv->v_size * nr)) {
87 ret = -EFAULT;
88 break;
89 }
90 total += nr;
91 if ((size_t)nr < n)
92 break;
93 if (pos == ppos)
94 pos += n;
95 }
96 argv->v_nmembs = total;
97
98 free_pages((unsigned long)buf, 0);
99 return ret;
100}
101
102static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
103{
104 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
105
106 return put_user(flags, (int __user *)argp);
107}
108
109static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
110 void __user *argp)
111{
112 struct nilfs_transaction_info ti;
113 unsigned int flags, oldflags;
114 int ret;
115
116 if (!inode_owner_or_capable(inode))
117 return -EACCES;
118
119 if (get_user(flags, (int __user *)argp))
120 return -EFAULT;
121
122 ret = mnt_want_write(filp->f_path.mnt);
123 if (ret)
124 return ret;
125
126 flags = nilfs_mask_flags(inode->i_mode, flags);
127
128 mutex_lock(&inode->i_mutex);
129
130 oldflags = NILFS_I(inode)->i_flags;
131
132 /*
133 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
134 * relevant capability.
135 */
136 ret = -EPERM;
137 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
138 !capable(CAP_LINUX_IMMUTABLE))
139 goto out;
140
141 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
142 if (ret)
143 goto out;
144
145 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
146 (flags & FS_FL_USER_MODIFIABLE);
147
148 nilfs_set_inode_flags(inode);
149 inode->i_ctime = CURRENT_TIME;
150 if (IS_SYNC(inode))
151 nilfs_set_transaction_flag(NILFS_TI_SYNC);
152
153 nilfs_mark_inode_dirty(inode);
154 ret = nilfs_transaction_commit(inode->i_sb);
155out:
156 mutex_unlock(&inode->i_mutex);
157 mnt_drop_write(filp->f_path.mnt);
158 return ret;
159}
160
161static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
162{
163 return put_user(inode->i_generation, (int __user *)argp);
164}
165
166static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
167 unsigned int cmd, void __user *argp)
168{
169 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
170 struct nilfs_transaction_info ti;
171 struct nilfs_cpmode cpmode;
172 int ret;
173
174 if (!capable(CAP_SYS_ADMIN))
175 return -EPERM;
176
177 ret = mnt_want_write(filp->f_path.mnt);
178 if (ret)
179 return ret;
180
181 ret = -EFAULT;
182 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
183 goto out;
184
185 down_read(&inode->i_sb->s_umount);
186
187 nilfs_transaction_begin(inode->i_sb, &ti, 0);
188 ret = nilfs_cpfile_change_cpmode(
189 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
190 if (unlikely(ret < 0))
191 nilfs_transaction_abort(inode->i_sb);
192 else
193 nilfs_transaction_commit(inode->i_sb); /* never fails */
194
195 up_read(&inode->i_sb->s_umount);
196out:
197 mnt_drop_write(filp->f_path.mnt);
198 return ret;
199}
200
201static int
202nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
203 unsigned int cmd, void __user *argp)
204{
205 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
206 struct nilfs_transaction_info ti;
207 __u64 cno;
208 int ret;
209
210 if (!capable(CAP_SYS_ADMIN))
211 return -EPERM;
212
213 ret = mnt_want_write(filp->f_path.mnt);
214 if (ret)
215 return ret;
216
217 ret = -EFAULT;
218 if (copy_from_user(&cno, argp, sizeof(cno)))
219 goto out;
220
221 nilfs_transaction_begin(inode->i_sb, &ti, 0);
222 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
223 if (unlikely(ret < 0))
224 nilfs_transaction_abort(inode->i_sb);
225 else
226 nilfs_transaction_commit(inode->i_sb); /* never fails */
227out:
228 mnt_drop_write(filp->f_path.mnt);
229 return ret;
230}
231
232static ssize_t
233nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
234 void *buf, size_t size, size_t nmembs)
235{
236 int ret;
237
238 down_read(&nilfs->ns_segctor_sem);
239 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
240 size, nmembs);
241 up_read(&nilfs->ns_segctor_sem);
242 return ret;
243}
244
245static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
246 unsigned int cmd, void __user *argp)
247{
248 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
249 struct nilfs_cpstat cpstat;
250 int ret;
251
252 down_read(&nilfs->ns_segctor_sem);
253 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
254 up_read(&nilfs->ns_segctor_sem);
255 if (ret < 0)
256 return ret;
257
258 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
259 ret = -EFAULT;
260 return ret;
261}
262
263static ssize_t
264nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
265 void *buf, size_t size, size_t nmembs)
266{
267 int ret;
268
269 down_read(&nilfs->ns_segctor_sem);
270 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
271 nmembs);
272 up_read(&nilfs->ns_segctor_sem);
273 return ret;
274}
275
276static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
277 unsigned int cmd, void __user *argp)
278{
279 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
280 struct nilfs_sustat sustat;
281 int ret;
282
283 down_read(&nilfs->ns_segctor_sem);
284 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
285 up_read(&nilfs->ns_segctor_sem);
286 if (ret < 0)
287 return ret;
288
289 if (copy_to_user(argp, &sustat, sizeof(sustat)))
290 ret = -EFAULT;
291 return ret;
292}
293
294static ssize_t
295nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
296 void *buf, size_t size, size_t nmembs)
297{
298 int ret;
299
300 down_read(&nilfs->ns_segctor_sem);
301 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
302 up_read(&nilfs->ns_segctor_sem);
303 return ret;
304}
305
306static ssize_t
307nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
308 void *buf, size_t size, size_t nmembs)
309{
310 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
311 struct nilfs_bdesc *bdescs = buf;
312 int ret, i;
313
314 down_read(&nilfs->ns_segctor_sem);
315 for (i = 0; i < nmembs; i++) {
316 ret = nilfs_bmap_lookup_at_level(bmap,
317 bdescs[i].bd_offset,
318 bdescs[i].bd_level + 1,
319 &bdescs[i].bd_blocknr);
320 if (ret < 0) {
321 if (ret != -ENOENT) {
322 up_read(&nilfs->ns_segctor_sem);
323 return ret;
324 }
325 bdescs[i].bd_blocknr = 0;
326 }
327 }
328 up_read(&nilfs->ns_segctor_sem);
329 return nmembs;
330}
331
332static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
333 unsigned int cmd, void __user *argp)
334{
335 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
336 struct nilfs_argv argv;
337 int ret;
338
339 if (copy_from_user(&argv, argp, sizeof(argv)))
340 return -EFAULT;
341
342 if (argv.v_size != sizeof(struct nilfs_bdesc))
343 return -EINVAL;
344
345 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
346 nilfs_ioctl_do_get_bdescs);
347 if (ret < 0)
348 return ret;
349
350 if (copy_to_user(argp, &argv, sizeof(argv)))
351 ret = -EFAULT;
352 return ret;
353}
354
355static int nilfs_ioctl_move_inode_block(struct inode *inode,
356 struct nilfs_vdesc *vdesc,
357 struct list_head *buffers)
358{
359 struct buffer_head *bh;
360 int ret;
361
362 if (vdesc->vd_flags == 0)
363 ret = nilfs_gccache_submit_read_data(
364 inode, vdesc->vd_offset, vdesc->vd_blocknr,
365 vdesc->vd_vblocknr, &bh);
366 else
367 ret = nilfs_gccache_submit_read_node(
368 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
369
370 if (unlikely(ret < 0)) {
371 if (ret == -ENOENT)
372 printk(KERN_CRIT
373 "%s: invalid virtual block address (%s): "
374 "ino=%llu, cno=%llu, offset=%llu, "
375 "blocknr=%llu, vblocknr=%llu\n",
376 __func__, vdesc->vd_flags ? "node" : "data",
377 (unsigned long long)vdesc->vd_ino,
378 (unsigned long long)vdesc->vd_cno,
379 (unsigned long long)vdesc->vd_offset,
380 (unsigned long long)vdesc->vd_blocknr,
381 (unsigned long long)vdesc->vd_vblocknr);
382 return ret;
383 }
384 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
385 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
386 "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
387 __func__, vdesc->vd_flags ? "node" : "data",
388 (unsigned long long)vdesc->vd_ino,
389 (unsigned long long)vdesc->vd_cno,
390 (unsigned long long)vdesc->vd_offset,
391 (unsigned long long)vdesc->vd_blocknr,
392 (unsigned long long)vdesc->vd_vblocknr);
393 brelse(bh);
394 return -EEXIST;
395 }
396 list_add_tail(&bh->b_assoc_buffers, buffers);
397 return 0;
398}
399
400static int nilfs_ioctl_move_blocks(struct super_block *sb,
401 struct nilfs_argv *argv, void *buf)
402{
403 size_t nmembs = argv->v_nmembs;
404 struct the_nilfs *nilfs = sb->s_fs_info;
405 struct inode *inode;
406 struct nilfs_vdesc *vdesc;
407 struct buffer_head *bh, *n;
408 LIST_HEAD(buffers);
409 ino_t ino;
410 __u64 cno;
411 int i, ret;
412
413 for (i = 0, vdesc = buf; i < nmembs; ) {
414 ino = vdesc->vd_ino;
415 cno = vdesc->vd_cno;
416 inode = nilfs_iget_for_gc(sb, ino, cno);
417 if (IS_ERR(inode)) {
418 ret = PTR_ERR(inode);
419 goto failed;
420 }
421 if (list_empty(&NILFS_I(inode)->i_dirty)) {
422 /*
423 * Add the inode to GC inode list. Garbage Collection
424 * is serialized and no two processes manipulate the
425 * list simultaneously.
426 */
427 igrab(inode);
428 list_add(&NILFS_I(inode)->i_dirty,
429 &nilfs->ns_gc_inodes);
430 }
431
432 do {
433 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
434 &buffers);
435 if (unlikely(ret < 0)) {
436 iput(inode);
437 goto failed;
438 }
439 vdesc++;
440 } while (++i < nmembs &&
441 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
442
443 iput(inode); /* The inode still remains in GC inode list */
444 }
445
446 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
447 ret = nilfs_gccache_wait_and_mark_dirty(bh);
448 if (unlikely(ret < 0)) {
449 WARN_ON(ret == -EEXIST);
450 goto failed;
451 }
452 list_del_init(&bh->b_assoc_buffers);
453 brelse(bh);
454 }
455 return nmembs;
456
457 failed:
458 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
459 list_del_init(&bh->b_assoc_buffers);
460 brelse(bh);
461 }
462 return ret;
463}
464
465static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
466 struct nilfs_argv *argv, void *buf)
467{
468 size_t nmembs = argv->v_nmembs;
469 struct inode *cpfile = nilfs->ns_cpfile;
470 struct nilfs_period *periods = buf;
471 int ret, i;
472
473 for (i = 0; i < nmembs; i++) {
474 ret = nilfs_cpfile_delete_checkpoints(
475 cpfile, periods[i].p_start, periods[i].p_end);
476 if (ret < 0)
477 return ret;
478 }
479 return nmembs;
480}
481
482static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
483 struct nilfs_argv *argv, void *buf)
484{
485 size_t nmembs = argv->v_nmembs;
486 int ret;
487
488 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
489
490 return (ret < 0) ? ret : nmembs;
491}
492
493static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
494 struct nilfs_argv *argv, void *buf)
495{
496 size_t nmembs = argv->v_nmembs;
497 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
498 struct nilfs_bdesc *bdescs = buf;
499 int ret, i;
500
501 for (i = 0; i < nmembs; i++) {
502 /* XXX: use macro or inline func to check liveness */
503 ret = nilfs_bmap_lookup_at_level(bmap,
504 bdescs[i].bd_offset,
505 bdescs[i].bd_level + 1,
506 &bdescs[i].bd_blocknr);
507 if (ret < 0) {
508 if (ret != -ENOENT)
509 return ret;
510 bdescs[i].bd_blocknr = 0;
511 }
512 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
513 /* skip dead block */
514 continue;
515 if (bdescs[i].bd_level == 0) {
516 ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
517 bdescs[i].bd_offset);
518 if (ret < 0) {
519 WARN_ON(ret == -ENOENT);
520 return ret;
521 }
522 } else {
523 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
524 bdescs[i].bd_level);
525 if (ret < 0) {
526 WARN_ON(ret == -ENOENT);
527 return ret;
528 }
529 }
530 }
531 return nmembs;
532}
533
534int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
535 struct nilfs_argv *argv, void **kbufs)
536{
537 const char *msg;
538 int ret;
539
540 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
541 if (ret < 0) {
542 /*
543 * can safely abort because checkpoints can be removed
544 * independently.
545 */
546 msg = "cannot delete checkpoints";
547 goto failed;
548 }
549 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
550 if (ret < 0) {
551 /*
552 * can safely abort because DAT file is updated atomically
553 * using a copy-on-write technique.
554 */
555 msg = "cannot delete virtual blocks from DAT file";
556 goto failed;
557 }
558 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
559 if (ret < 0) {
560 /*
561 * can safely abort because the operation is nondestructive.
562 */
563 msg = "cannot mark copying blocks dirty";
564 goto failed;
565 }
566 return 0;
567
568 failed:
569 printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
570 msg, ret);
571 return ret;
572}
573
574static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
575 unsigned int cmd, void __user *argp)
576{
577 struct nilfs_argv argv[5];
578 static const size_t argsz[5] = {
579 sizeof(struct nilfs_vdesc),
580 sizeof(struct nilfs_period),
581 sizeof(__u64),
582 sizeof(struct nilfs_bdesc),
583 sizeof(__u64),
584 };
585 void __user *base;
586 void *kbufs[5];
587 struct the_nilfs *nilfs;
588 size_t len, nsegs;
589 int n, ret;
590
591 if (!capable(CAP_SYS_ADMIN))
592 return -EPERM;
593
594 ret = mnt_want_write(filp->f_path.mnt);
595 if (ret)
596 return ret;
597
598 ret = -EFAULT;
599 if (copy_from_user(argv, argp, sizeof(argv)))
600 goto out;
601
602 ret = -EINVAL;
603 nsegs = argv[4].v_nmembs;
604 if (argv[4].v_size != argsz[4])
605 goto out;
606
607 /*
608 * argv[4] points to segment numbers this ioctl cleans. We
609 * use kmalloc() for its buffer because memory used for the
610 * segment numbers is enough small.
611 */
612 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
613 nsegs * sizeof(__u64));
614 if (IS_ERR(kbufs[4])) {
615 ret = PTR_ERR(kbufs[4]);
616 goto out;
617 }
618 nilfs = inode->i_sb->s_fs_info;
619
620 for (n = 0; n < 4; n++) {
621 ret = -EINVAL;
622 if (argv[n].v_size != argsz[n])
623 goto out_free;
624
625 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
626 goto out_free;
627
628 len = argv[n].v_size * argv[n].v_nmembs;
629 base = (void __user *)(unsigned long)argv[n].v_base;
630 if (len == 0) {
631 kbufs[n] = NULL;
632 continue;
633 }
634
635 kbufs[n] = vmalloc(len);
636 if (!kbufs[n]) {
637 ret = -ENOMEM;
638 goto out_free;
639 }
640 if (copy_from_user(kbufs[n], base, len)) {
641 ret = -EFAULT;
642 vfree(kbufs[n]);
643 goto out_free;
644 }
645 }
646
647 /*
648 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
649 * which will operates an inode list without blocking.
650 * To protect the list from concurrent operations,
651 * nilfs_ioctl_move_blocks should be atomic operation.
652 */
653 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
654 ret = -EBUSY;
655 goto out_free;
656 }
657
658 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
659
660 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
661 if (ret < 0)
662 printk(KERN_ERR "NILFS: GC failed during preparation: "
663 "cannot read source blocks: err=%d\n", ret);
664 else
665 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
666
667 nilfs_remove_all_gcinodes(nilfs);
668 clear_nilfs_gc_running(nilfs);
669
670out_free:
671 while (--n >= 0)
672 vfree(kbufs[n]);
673 kfree(kbufs[4]);
674out:
675 mnt_drop_write(filp->f_path.mnt);
676 return ret;
677}
678
679static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
680 unsigned int cmd, void __user *argp)
681{
682 __u64 cno;
683 int ret;
684 struct the_nilfs *nilfs;
685
686 ret = nilfs_construct_segment(inode->i_sb);
687 if (ret < 0)
688 return ret;
689
690 if (argp != NULL) {
691 nilfs = inode->i_sb->s_fs_info;
692 down_read(&nilfs->ns_segctor_sem);
693 cno = nilfs->ns_cno - 1;
694 up_read(&nilfs->ns_segctor_sem);
695 if (copy_to_user(argp, &cno, sizeof(cno)))
696 return -EFAULT;
697 }
698 return 0;
699}
700
701static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
702 void __user *argp)
703{
704 __u64 newsize;
705 int ret = -EPERM;
706
707 if (!capable(CAP_SYS_ADMIN))
708 goto out;
709
710 ret = mnt_want_write(filp->f_path.mnt);
711 if (ret)
712 goto out;
713
714 ret = -EFAULT;
715 if (copy_from_user(&newsize, argp, sizeof(newsize)))
716 goto out_drop_write;
717
718 ret = nilfs_resize_fs(inode->i_sb, newsize);
719
720out_drop_write:
721 mnt_drop_write(filp->f_path.mnt);
722out:
723 return ret;
724}
725
726static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
727{
728 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
729 __u64 range[2];
730 __u64 minseg, maxseg;
731 unsigned long segbytes;
732 int ret = -EPERM;
733
734 if (!capable(CAP_SYS_ADMIN))
735 goto out;
736
737 ret = -EFAULT;
738 if (copy_from_user(range, argp, sizeof(__u64[2])))
739 goto out;
740
741 ret = -ERANGE;
742 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
743 goto out;
744
745 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
746
747 minseg = range[0] + segbytes - 1;
748 do_div(minseg, segbytes);
749 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
750 do_div(maxseg, segbytes);
751 maxseg--;
752
753 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
754out:
755 return ret;
756}
757
758static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
759 unsigned int cmd, void __user *argp,
760 size_t membsz,
761 ssize_t (*dofunc)(struct the_nilfs *,
762 __u64 *, int,
763 void *, size_t, size_t))
764
765{
766 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
767 struct nilfs_argv argv;
768 int ret;
769
770 if (copy_from_user(&argv, argp, sizeof(argv)))
771 return -EFAULT;
772
773 if (argv.v_size < membsz)
774 return -EINVAL;
775
776 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
777 if (ret < 0)
778 return ret;
779
780 if (copy_to_user(argp, &argv, sizeof(argv)))
781 ret = -EFAULT;
782 return ret;
783}
784
785long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
786{
787 struct inode *inode = filp->f_dentry->d_inode;
788 void __user *argp = (void __user *)arg;
789
790 switch (cmd) {
791 case FS_IOC_GETFLAGS:
792 return nilfs_ioctl_getflags(inode, argp);
793 case FS_IOC_SETFLAGS:
794 return nilfs_ioctl_setflags(inode, filp, argp);
795 case FS_IOC_GETVERSION:
796 return nilfs_ioctl_getversion(inode, argp);
797 case NILFS_IOCTL_CHANGE_CPMODE:
798 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
799 case NILFS_IOCTL_DELETE_CHECKPOINT:
800 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
801 case NILFS_IOCTL_GET_CPINFO:
802 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
803 sizeof(struct nilfs_cpinfo),
804 nilfs_ioctl_do_get_cpinfo);
805 case NILFS_IOCTL_GET_CPSTAT:
806 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
807 case NILFS_IOCTL_GET_SUINFO:
808 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
809 sizeof(struct nilfs_suinfo),
810 nilfs_ioctl_do_get_suinfo);
811 case NILFS_IOCTL_GET_SUSTAT:
812 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
813 case NILFS_IOCTL_GET_VINFO:
814 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
815 sizeof(struct nilfs_vinfo),
816 nilfs_ioctl_do_get_vinfo);
817 case NILFS_IOCTL_GET_BDESCS:
818 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
819 case NILFS_IOCTL_CLEAN_SEGMENTS:
820 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
821 case NILFS_IOCTL_SYNC:
822 return nilfs_ioctl_sync(inode, filp, cmd, argp);
823 case NILFS_IOCTL_RESIZE:
824 return nilfs_ioctl_resize(inode, filp, argp);
825 case NILFS_IOCTL_SET_ALLOC_RANGE:
826 return nilfs_ioctl_set_alloc_range(inode, argp);
827 default:
828 return -ENOTTY;
829 }
830}
831
832#ifdef CONFIG_COMPAT
833long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
834{
835 switch (cmd) {
836 case FS_IOC32_GETFLAGS:
837 cmd = FS_IOC_GETFLAGS;
838 break;
839 case FS_IOC32_SETFLAGS:
840 cmd = FS_IOC_SETFLAGS;
841 break;
842 case FS_IOC32_GETVERSION:
843 cmd = FS_IOC_GETVERSION;
844 break;
845 default:
846 return -ENOIOCTLCMD;
847 }
848 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
849}
850#endif
1/*
2 * ioctl.c - NILFS ioctl operations.
3 *
4 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * Written by Koji Sato.
17 */
18
19#include <linux/fs.h>
20#include <linux/wait.h>
21#include <linux/slab.h>
22#include <linux/capability.h> /* capable() */
23#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
24#include <linux/vmalloc.h>
25#include <linux/compat.h> /* compat_ptr() */
26#include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */
27#include <linux/buffer_head.h>
28#include "nilfs.h"
29#include "segment.h"
30#include "bmap.h"
31#include "cpfile.h"
32#include "sufile.h"
33#include "dat.h"
34
35/**
36 * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
37 * @nilfs: nilfs object
38 * @argv: vector of arguments from userspace
39 * @dir: set of direction flags
40 * @dofunc: concrete function of get/set metadata info
41 *
42 * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
43 * calling dofunc() function on the basis of @argv argument.
44 *
45 * Return Value: On success, 0 is returned and requested metadata info
46 * is copied into userspace. On error, one of the following
47 * negative error codes is returned.
48 *
49 * %-EINVAL - Invalid arguments from userspace.
50 *
51 * %-ENOMEM - Insufficient amount of memory available.
52 *
53 * %-EFAULT - Failure during execution of requested operation.
54 */
55static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
56 struct nilfs_argv *argv, int dir,
57 ssize_t (*dofunc)(struct the_nilfs *,
58 __u64 *, int,
59 void *, size_t, size_t))
60{
61 void *buf;
62 void __user *base = (void __user *)(unsigned long)argv->v_base;
63 size_t maxmembs, total, n;
64 ssize_t nr;
65 int ret, i;
66 __u64 pos, ppos;
67
68 if (argv->v_nmembs == 0)
69 return 0;
70
71 if (argv->v_size > PAGE_SIZE)
72 return -EINVAL;
73
74 /*
75 * Reject pairs of a start item position (argv->v_index) and a
76 * total count (argv->v_nmembs) which leads position 'pos' to
77 * overflow by the increment at the end of the loop.
78 */
79 if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
80 return -EINVAL;
81
82 buf = (void *)__get_free_pages(GFP_NOFS, 0);
83 if (unlikely(!buf))
84 return -ENOMEM;
85 maxmembs = PAGE_SIZE / argv->v_size;
86
87 ret = 0;
88 total = 0;
89 pos = argv->v_index;
90 for (i = 0; i < argv->v_nmembs; i += n) {
91 n = (argv->v_nmembs - i < maxmembs) ?
92 argv->v_nmembs - i : maxmembs;
93 if ((dir & _IOC_WRITE) &&
94 copy_from_user(buf, base + argv->v_size * i,
95 argv->v_size * n)) {
96 ret = -EFAULT;
97 break;
98 }
99 ppos = pos;
100 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
101 n);
102 if (nr < 0) {
103 ret = nr;
104 break;
105 }
106 if ((dir & _IOC_READ) &&
107 copy_to_user(base + argv->v_size * i, buf,
108 argv->v_size * nr)) {
109 ret = -EFAULT;
110 break;
111 }
112 total += nr;
113 if ((size_t)nr < n)
114 break;
115 if (pos == ppos)
116 pos += n;
117 }
118 argv->v_nmembs = total;
119
120 free_pages((unsigned long)buf, 0);
121 return ret;
122}
123
124/**
125 * nilfs_ioctl_getflags - ioctl to support lsattr
126 */
127static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
128{
129 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
130
131 return put_user(flags, (int __user *)argp);
132}
133
134/**
135 * nilfs_ioctl_setflags - ioctl to support chattr
136 */
137static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
138 void __user *argp)
139{
140 struct nilfs_transaction_info ti;
141 unsigned int flags, oldflags;
142 int ret;
143
144 if (!inode_owner_or_capable(inode))
145 return -EACCES;
146
147 if (get_user(flags, (int __user *)argp))
148 return -EFAULT;
149
150 ret = mnt_want_write_file(filp);
151 if (ret)
152 return ret;
153
154 flags = nilfs_mask_flags(inode->i_mode, flags);
155
156 inode_lock(inode);
157
158 oldflags = NILFS_I(inode)->i_flags;
159
160 /*
161 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
162 * relevant capability.
163 */
164 ret = -EPERM;
165 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
166 !capable(CAP_LINUX_IMMUTABLE))
167 goto out;
168
169 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
170 if (ret)
171 goto out;
172
173 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
174 (flags & FS_FL_USER_MODIFIABLE);
175
176 nilfs_set_inode_flags(inode);
177 inode->i_ctime = current_time(inode);
178 if (IS_SYNC(inode))
179 nilfs_set_transaction_flag(NILFS_TI_SYNC);
180
181 nilfs_mark_inode_dirty(inode);
182 ret = nilfs_transaction_commit(inode->i_sb);
183out:
184 inode_unlock(inode);
185 mnt_drop_write_file(filp);
186 return ret;
187}
188
189/**
190 * nilfs_ioctl_getversion - get info about a file's version (generation number)
191 */
192static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
193{
194 return put_user(inode->i_generation, (int __user *)argp);
195}
196
197/**
198 * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
199 * @inode: inode object
200 * @filp: file object
201 * @cmd: ioctl's request code
202 * @argp: pointer on argument from userspace
203 *
204 * Description: nilfs_ioctl_change_cpmode() function changes mode of
205 * given checkpoint between checkpoint and snapshot state. This ioctl
206 * is used in chcp and mkcp utilities.
207 *
208 * Return Value: On success, 0 is returned and mode of a checkpoint is
209 * changed. On error, one of the following negative error codes
210 * is returned.
211 *
212 * %-EPERM - Operation not permitted.
213 *
214 * %-EFAULT - Failure during checkpoint mode changing.
215 */
216static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
217 unsigned int cmd, void __user *argp)
218{
219 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
220 struct nilfs_transaction_info ti;
221 struct nilfs_cpmode cpmode;
222 int ret;
223
224 if (!capable(CAP_SYS_ADMIN))
225 return -EPERM;
226
227 ret = mnt_want_write_file(filp);
228 if (ret)
229 return ret;
230
231 ret = -EFAULT;
232 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
233 goto out;
234
235 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
236
237 nilfs_transaction_begin(inode->i_sb, &ti, 0);
238 ret = nilfs_cpfile_change_cpmode(
239 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
240 if (unlikely(ret < 0))
241 nilfs_transaction_abort(inode->i_sb);
242 else
243 nilfs_transaction_commit(inode->i_sb); /* never fails */
244
245 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
246out:
247 mnt_drop_write_file(filp);
248 return ret;
249}
250
251/**
252 * nilfs_ioctl_delete_checkpoint - remove checkpoint
253 * @inode: inode object
254 * @filp: file object
255 * @cmd: ioctl's request code
256 * @argp: pointer on argument from userspace
257 *
258 * Description: nilfs_ioctl_delete_checkpoint() function removes
259 * checkpoint from NILFS2 file system. This ioctl is used in rmcp
260 * utility.
261 *
262 * Return Value: On success, 0 is returned and a checkpoint is
263 * removed. On error, one of the following negative error codes
264 * is returned.
265 *
266 * %-EPERM - Operation not permitted.
267 *
268 * %-EFAULT - Failure during checkpoint removing.
269 */
270static int
271nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
272 unsigned int cmd, void __user *argp)
273{
274 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
275 struct nilfs_transaction_info ti;
276 __u64 cno;
277 int ret;
278
279 if (!capable(CAP_SYS_ADMIN))
280 return -EPERM;
281
282 ret = mnt_want_write_file(filp);
283 if (ret)
284 return ret;
285
286 ret = -EFAULT;
287 if (copy_from_user(&cno, argp, sizeof(cno)))
288 goto out;
289
290 nilfs_transaction_begin(inode->i_sb, &ti, 0);
291 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
292 if (unlikely(ret < 0))
293 nilfs_transaction_abort(inode->i_sb);
294 else
295 nilfs_transaction_commit(inode->i_sb); /* never fails */
296out:
297 mnt_drop_write_file(filp);
298 return ret;
299}
300
301/**
302 * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
303 * @nilfs: nilfs object
304 * @posp: pointer on array of checkpoint's numbers
305 * @flags: checkpoint mode (checkpoint or snapshot)
306 * @buf: buffer for storing checkponts' info
307 * @size: size in bytes of one checkpoint info item in array
308 * @nmembs: number of checkpoints in array (numbers and infos)
309 *
310 * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
311 * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
312 * lscp utility and by nilfs_cleanerd daemon.
313 *
314 * Return value: count of nilfs_cpinfo structures in output buffer.
315 */
316static ssize_t
317nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
318 void *buf, size_t size, size_t nmembs)
319{
320 int ret;
321
322 down_read(&nilfs->ns_segctor_sem);
323 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
324 size, nmembs);
325 up_read(&nilfs->ns_segctor_sem);
326 return ret;
327}
328
329/**
330 * nilfs_ioctl_get_cpstat - get checkpoints statistics
331 * @inode: inode object
332 * @filp: file object
333 * @cmd: ioctl's request code
334 * @argp: pointer on argument from userspace
335 *
336 * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
337 * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
338 * and by nilfs_cleanerd daemon.
339 *
340 * Return Value: On success, 0 is returned, and checkpoints information is
341 * copied into userspace pointer @argp. On error, one of the following
342 * negative error codes is returned.
343 *
344 * %-EIO - I/O error.
345 *
346 * %-ENOMEM - Insufficient amount of memory available.
347 *
348 * %-EFAULT - Failure during getting checkpoints statistics.
349 */
350static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
351 unsigned int cmd, void __user *argp)
352{
353 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
354 struct nilfs_cpstat cpstat;
355 int ret;
356
357 down_read(&nilfs->ns_segctor_sem);
358 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
359 up_read(&nilfs->ns_segctor_sem);
360 if (ret < 0)
361 return ret;
362
363 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
364 ret = -EFAULT;
365 return ret;
366}
367
368/**
369 * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
370 * @nilfs: nilfs object
371 * @posp: pointer on array of segment numbers
372 * @flags: *not used*
373 * @buf: buffer for storing suinfo array
374 * @size: size in bytes of one suinfo item in array
375 * @nmembs: count of segment numbers and suinfos in array
376 *
377 * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
378 * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
379 * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
380 *
381 * Return value: count of nilfs_suinfo structures in output buffer.
382 */
383static ssize_t
384nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
385 void *buf, size_t size, size_t nmembs)
386{
387 int ret;
388
389 down_read(&nilfs->ns_segctor_sem);
390 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
391 nmembs);
392 up_read(&nilfs->ns_segctor_sem);
393 return ret;
394}
395
396/**
397 * nilfs_ioctl_get_sustat - get segment usage statistics
398 * @inode: inode object
399 * @filp: file object
400 * @cmd: ioctl's request code
401 * @argp: pointer on argument from userspace
402 *
403 * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
404 * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
405 * and by nilfs_cleanerd daemon.
406 *
407 * Return Value: On success, 0 is returned, and segment usage information is
408 * copied into userspace pointer @argp. On error, one of the following
409 * negative error codes is returned.
410 *
411 * %-EIO - I/O error.
412 *
413 * %-ENOMEM - Insufficient amount of memory available.
414 *
415 * %-EFAULT - Failure during getting segment usage statistics.
416 */
417static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
418 unsigned int cmd, void __user *argp)
419{
420 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
421 struct nilfs_sustat sustat;
422 int ret;
423
424 down_read(&nilfs->ns_segctor_sem);
425 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
426 up_read(&nilfs->ns_segctor_sem);
427 if (ret < 0)
428 return ret;
429
430 if (copy_to_user(argp, &sustat, sizeof(sustat)))
431 ret = -EFAULT;
432 return ret;
433}
434
435/**
436 * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
437 * @nilfs: nilfs object
438 * @posp: *not used*
439 * @flags: *not used*
440 * @buf: buffer for storing array of nilfs_vinfo structures
441 * @size: size in bytes of one vinfo item in array
442 * @nmembs: count of vinfos in array
443 *
444 * Description: nilfs_ioctl_do_get_vinfo() function returns information
445 * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
446 * by nilfs_cleanerd daemon.
447 *
448 * Return value: count of nilfs_vinfo structures in output buffer.
449 */
450static ssize_t
451nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
452 void *buf, size_t size, size_t nmembs)
453{
454 int ret;
455
456 down_read(&nilfs->ns_segctor_sem);
457 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
458 up_read(&nilfs->ns_segctor_sem);
459 return ret;
460}
461
462/**
463 * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
464 * @nilfs: nilfs object
465 * @posp: *not used*
466 * @flags: *not used*
467 * @buf: buffer for storing array of nilfs_bdesc structures
468 * @size: size in bytes of one bdesc item in array
469 * @nmembs: count of bdescs in array
470 *
471 * Description: nilfs_ioctl_do_get_bdescs() function returns information
472 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
473 * is used by nilfs_cleanerd daemon.
474 *
475 * Return value: count of nilfs_bdescs structures in output buffer.
476 */
477static ssize_t
478nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
479 void *buf, size_t size, size_t nmembs)
480{
481 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
482 struct nilfs_bdesc *bdescs = buf;
483 int ret, i;
484
485 down_read(&nilfs->ns_segctor_sem);
486 for (i = 0; i < nmembs; i++) {
487 ret = nilfs_bmap_lookup_at_level(bmap,
488 bdescs[i].bd_offset,
489 bdescs[i].bd_level + 1,
490 &bdescs[i].bd_blocknr);
491 if (ret < 0) {
492 if (ret != -ENOENT) {
493 up_read(&nilfs->ns_segctor_sem);
494 return ret;
495 }
496 bdescs[i].bd_blocknr = 0;
497 }
498 }
499 up_read(&nilfs->ns_segctor_sem);
500 return nmembs;
501}
502
503/**
504 * nilfs_ioctl_get_bdescs - get disk block descriptors
505 * @inode: inode object
506 * @filp: file object
507 * @cmd: ioctl's request code
508 * @argp: pointer on argument from userspace
509 *
510 * Description: nilfs_ioctl_do_get_bdescs() function returns information
511 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
512 * is used by nilfs_cleanerd daemon.
513 *
514 * Return Value: On success, 0 is returned, and disk block descriptors are
515 * copied into userspace pointer @argp. On error, one of the following
516 * negative error codes is returned.
517 *
518 * %-EINVAL - Invalid arguments from userspace.
519 *
520 * %-EIO - I/O error.
521 *
522 * %-ENOMEM - Insufficient amount of memory available.
523 *
524 * %-EFAULT - Failure during getting disk block descriptors.
525 */
526static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
527 unsigned int cmd, void __user *argp)
528{
529 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
530 struct nilfs_argv argv;
531 int ret;
532
533 if (copy_from_user(&argv, argp, sizeof(argv)))
534 return -EFAULT;
535
536 if (argv.v_size != sizeof(struct nilfs_bdesc))
537 return -EINVAL;
538
539 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
540 nilfs_ioctl_do_get_bdescs);
541 if (ret < 0)
542 return ret;
543
544 if (copy_to_user(argp, &argv, sizeof(argv)))
545 ret = -EFAULT;
546 return ret;
547}
548
549/**
550 * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
551 * @inode: inode object
552 * @vdesc: descriptor of virtual block number
553 * @buffers: list of moving buffers
554 *
555 * Description: nilfs_ioctl_move_inode_block() function registers data/node
556 * buffer in the GC pagecache and submit read request.
557 *
558 * Return Value: On success, 0 is returned. On error, one of the following
559 * negative error codes is returned.
560 *
561 * %-EIO - I/O error.
562 *
563 * %-ENOMEM - Insufficient amount of memory available.
564 *
565 * %-ENOENT - Requested block doesn't exist.
566 *
567 * %-EEXIST - Blocks conflict is detected.
568 */
569static int nilfs_ioctl_move_inode_block(struct inode *inode,
570 struct nilfs_vdesc *vdesc,
571 struct list_head *buffers)
572{
573 struct buffer_head *bh;
574 int ret;
575
576 if (vdesc->vd_flags == 0)
577 ret = nilfs_gccache_submit_read_data(
578 inode, vdesc->vd_offset, vdesc->vd_blocknr,
579 vdesc->vd_vblocknr, &bh);
580 else
581 ret = nilfs_gccache_submit_read_node(
582 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
583
584 if (unlikely(ret < 0)) {
585 if (ret == -ENOENT)
586 nilfs_msg(inode->i_sb, KERN_CRIT,
587 "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
588 __func__, vdesc->vd_flags ? "node" : "data",
589 (unsigned long long)vdesc->vd_ino,
590 (unsigned long long)vdesc->vd_cno,
591 (unsigned long long)vdesc->vd_offset,
592 (unsigned long long)vdesc->vd_blocknr,
593 (unsigned long long)vdesc->vd_vblocknr);
594 return ret;
595 }
596 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
597 nilfs_msg(inode->i_sb, KERN_CRIT,
598 "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
599 __func__, vdesc->vd_flags ? "node" : "data",
600 (unsigned long long)vdesc->vd_ino,
601 (unsigned long long)vdesc->vd_cno,
602 (unsigned long long)vdesc->vd_offset,
603 (unsigned long long)vdesc->vd_blocknr,
604 (unsigned long long)vdesc->vd_vblocknr);
605 brelse(bh);
606 return -EEXIST;
607 }
608 list_add_tail(&bh->b_assoc_buffers, buffers);
609 return 0;
610}
611
612/**
613 * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
614 * @sb: superblock object
615 * @argv: vector of arguments from userspace
616 * @buf: array of nilfs_vdesc structures
617 *
618 * Description: nilfs_ioctl_move_blocks() function reads valid data/node
619 * blocks that garbage collector specified with the array of nilfs_vdesc
620 * structures and stores them into page caches of GC inodes.
621 *
622 * Return Value: Number of processed nilfs_vdesc structures or
623 * error code, otherwise.
624 */
625static int nilfs_ioctl_move_blocks(struct super_block *sb,
626 struct nilfs_argv *argv, void *buf)
627{
628 size_t nmembs = argv->v_nmembs;
629 struct the_nilfs *nilfs = sb->s_fs_info;
630 struct inode *inode;
631 struct nilfs_vdesc *vdesc;
632 struct buffer_head *bh, *n;
633 LIST_HEAD(buffers);
634 ino_t ino;
635 __u64 cno;
636 int i, ret;
637
638 for (i = 0, vdesc = buf; i < nmembs; ) {
639 ino = vdesc->vd_ino;
640 cno = vdesc->vd_cno;
641 inode = nilfs_iget_for_gc(sb, ino, cno);
642 if (IS_ERR(inode)) {
643 ret = PTR_ERR(inode);
644 goto failed;
645 }
646 if (list_empty(&NILFS_I(inode)->i_dirty)) {
647 /*
648 * Add the inode to GC inode list. Garbage Collection
649 * is serialized and no two processes manipulate the
650 * list simultaneously.
651 */
652 igrab(inode);
653 list_add(&NILFS_I(inode)->i_dirty,
654 &nilfs->ns_gc_inodes);
655 }
656
657 do {
658 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
659 &buffers);
660 if (unlikely(ret < 0)) {
661 iput(inode);
662 goto failed;
663 }
664 vdesc++;
665 } while (++i < nmembs &&
666 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
667
668 iput(inode); /* The inode still remains in GC inode list */
669 }
670
671 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
672 ret = nilfs_gccache_wait_and_mark_dirty(bh);
673 if (unlikely(ret < 0)) {
674 WARN_ON(ret == -EEXIST);
675 goto failed;
676 }
677 list_del_init(&bh->b_assoc_buffers);
678 brelse(bh);
679 }
680 return nmembs;
681
682 failed:
683 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
684 list_del_init(&bh->b_assoc_buffers);
685 brelse(bh);
686 }
687 return ret;
688}
689
690/**
691 * nilfs_ioctl_delete_checkpoints - delete checkpoints
692 * @nilfs: nilfs object
693 * @argv: vector of arguments from userspace
694 * @buf: array of periods of checkpoints numbers
695 *
696 * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
697 * in the period from p_start to p_end, excluding p_end itself. The checkpoints
698 * which have been already deleted are ignored.
699 *
700 * Return Value: Number of processed nilfs_period structures or
701 * error code, otherwise.
702 *
703 * %-EIO - I/O error.
704 *
705 * %-ENOMEM - Insufficient amount of memory available.
706 *
707 * %-EINVAL - invalid checkpoints.
708 */
709static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
710 struct nilfs_argv *argv, void *buf)
711{
712 size_t nmembs = argv->v_nmembs;
713 struct inode *cpfile = nilfs->ns_cpfile;
714 struct nilfs_period *periods = buf;
715 int ret, i;
716
717 for (i = 0; i < nmembs; i++) {
718 ret = nilfs_cpfile_delete_checkpoints(
719 cpfile, periods[i].p_start, periods[i].p_end);
720 if (ret < 0)
721 return ret;
722 }
723 return nmembs;
724}
725
726/**
727 * nilfs_ioctl_free_vblocknrs - free virtual block numbers
728 * @nilfs: nilfs object
729 * @argv: vector of arguments from userspace
730 * @buf: array of virtual block numbers
731 *
732 * Description: nilfs_ioctl_free_vblocknrs() function frees
733 * the virtual block numbers specified by @buf and @argv->v_nmembs.
734 *
735 * Return Value: Number of processed virtual block numbers or
736 * error code, otherwise.
737 *
738 * %-EIO - I/O error.
739 *
740 * %-ENOMEM - Insufficient amount of memory available.
741 *
742 * %-ENOENT - The virtual block number have not been allocated.
743 */
744static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
745 struct nilfs_argv *argv, void *buf)
746{
747 size_t nmembs = argv->v_nmembs;
748 int ret;
749
750 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
751
752 return (ret < 0) ? ret : nmembs;
753}
754
755/**
756 * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
757 * @nilfs: nilfs object
758 * @argv: vector of arguments from userspace
759 * @buf: array of block descriptors
760 *
761 * Description: nilfs_ioctl_mark_blocks_dirty() function marks
762 * metadata file or data blocks as dirty.
763 *
764 * Return Value: Number of processed block descriptors or
765 * error code, otherwise.
766 *
767 * %-ENOMEM - Insufficient memory available.
768 *
769 * %-EIO - I/O error
770 *
771 * %-ENOENT - the specified block does not exist (hole block)
772 */
773static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
774 struct nilfs_argv *argv, void *buf)
775{
776 size_t nmembs = argv->v_nmembs;
777 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
778 struct nilfs_bdesc *bdescs = buf;
779 struct buffer_head *bh;
780 int ret, i;
781
782 for (i = 0; i < nmembs; i++) {
783 /* XXX: use macro or inline func to check liveness */
784 ret = nilfs_bmap_lookup_at_level(bmap,
785 bdescs[i].bd_offset,
786 bdescs[i].bd_level + 1,
787 &bdescs[i].bd_blocknr);
788 if (ret < 0) {
789 if (ret != -ENOENT)
790 return ret;
791 bdescs[i].bd_blocknr = 0;
792 }
793 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
794 /* skip dead block */
795 continue;
796 if (bdescs[i].bd_level == 0) {
797 ret = nilfs_mdt_get_block(nilfs->ns_dat,
798 bdescs[i].bd_offset,
799 false, NULL, &bh);
800 if (unlikely(ret)) {
801 WARN_ON(ret == -ENOENT);
802 return ret;
803 }
804 mark_buffer_dirty(bh);
805 nilfs_mdt_mark_dirty(nilfs->ns_dat);
806 put_bh(bh);
807 } else {
808 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
809 bdescs[i].bd_level);
810 if (ret < 0) {
811 WARN_ON(ret == -ENOENT);
812 return ret;
813 }
814 }
815 }
816 return nmembs;
817}
818
819int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
820 struct nilfs_argv *argv, void **kbufs)
821{
822 const char *msg;
823 int ret;
824
825 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
826 if (ret < 0) {
827 /*
828 * can safely abort because checkpoints can be removed
829 * independently.
830 */
831 msg = "cannot delete checkpoints";
832 goto failed;
833 }
834 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
835 if (ret < 0) {
836 /*
837 * can safely abort because DAT file is updated atomically
838 * using a copy-on-write technique.
839 */
840 msg = "cannot delete virtual blocks from DAT file";
841 goto failed;
842 }
843 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
844 if (ret < 0) {
845 /*
846 * can safely abort because the operation is nondestructive.
847 */
848 msg = "cannot mark copying blocks dirty";
849 goto failed;
850 }
851 return 0;
852
853 failed:
854 nilfs_msg(nilfs->ns_sb, KERN_ERR, "error %d preparing GC: %s", ret,
855 msg);
856 return ret;
857}
858
859/**
860 * nilfs_ioctl_clean_segments - clean segments
861 * @inode: inode object
862 * @filp: file object
863 * @cmd: ioctl's request code
864 * @argp: pointer on argument from userspace
865 *
866 * Description: nilfs_ioctl_clean_segments() function makes garbage
867 * collection operation in the environment of requested parameters
868 * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
869 * nilfs_cleanerd daemon.
870 *
871 * Return Value: On success, 0 is returned or error code, otherwise.
872 */
873static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
874 unsigned int cmd, void __user *argp)
875{
876 struct nilfs_argv argv[5];
877 static const size_t argsz[5] = {
878 sizeof(struct nilfs_vdesc),
879 sizeof(struct nilfs_period),
880 sizeof(__u64),
881 sizeof(struct nilfs_bdesc),
882 sizeof(__u64),
883 };
884 void __user *base;
885 void *kbufs[5];
886 struct the_nilfs *nilfs;
887 size_t len, nsegs;
888 int n, ret;
889
890 if (!capable(CAP_SYS_ADMIN))
891 return -EPERM;
892
893 ret = mnt_want_write_file(filp);
894 if (ret)
895 return ret;
896
897 ret = -EFAULT;
898 if (copy_from_user(argv, argp, sizeof(argv)))
899 goto out;
900
901 ret = -EINVAL;
902 nsegs = argv[4].v_nmembs;
903 if (argv[4].v_size != argsz[4])
904 goto out;
905 if (nsegs > UINT_MAX / sizeof(__u64))
906 goto out;
907
908 /*
909 * argv[4] points to segment numbers this ioctl cleans. We
910 * use kmalloc() for its buffer because memory used for the
911 * segment numbers is enough small.
912 */
913 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
914 nsegs * sizeof(__u64));
915 if (IS_ERR(kbufs[4])) {
916 ret = PTR_ERR(kbufs[4]);
917 goto out;
918 }
919 nilfs = inode->i_sb->s_fs_info;
920
921 for (n = 0; n < 4; n++) {
922 ret = -EINVAL;
923 if (argv[n].v_size != argsz[n])
924 goto out_free;
925
926 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
927 goto out_free;
928
929 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
930 goto out_free;
931
932 len = argv[n].v_size * argv[n].v_nmembs;
933 base = (void __user *)(unsigned long)argv[n].v_base;
934 if (len == 0) {
935 kbufs[n] = NULL;
936 continue;
937 }
938
939 kbufs[n] = vmalloc(len);
940 if (!kbufs[n]) {
941 ret = -ENOMEM;
942 goto out_free;
943 }
944 if (copy_from_user(kbufs[n], base, len)) {
945 ret = -EFAULT;
946 vfree(kbufs[n]);
947 goto out_free;
948 }
949 }
950
951 /*
952 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
953 * which will operates an inode list without blocking.
954 * To protect the list from concurrent operations,
955 * nilfs_ioctl_move_blocks should be atomic operation.
956 */
957 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
958 ret = -EBUSY;
959 goto out_free;
960 }
961
962 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
963 if (ret < 0) {
964 nilfs_msg(inode->i_sb, KERN_ERR,
965 "error %d preparing GC: cannot read source blocks",
966 ret);
967 } else {
968 if (nilfs_sb_need_update(nilfs))
969 set_nilfs_discontinued(nilfs);
970 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
971 }
972
973 nilfs_remove_all_gcinodes(nilfs);
974 clear_nilfs_gc_running(nilfs);
975
976out_free:
977 while (--n >= 0)
978 vfree(kbufs[n]);
979 kfree(kbufs[4]);
980out:
981 mnt_drop_write_file(filp);
982 return ret;
983}
984
985/**
986 * nilfs_ioctl_sync - make a checkpoint
987 * @inode: inode object
988 * @filp: file object
989 * @cmd: ioctl's request code
990 * @argp: pointer on argument from userspace
991 *
992 * Description: nilfs_ioctl_sync() function constructs a logical segment
993 * for checkpointing. This function guarantees that all modified data
994 * and metadata are written out to the device when it successfully
995 * returned.
996 *
997 * Return Value: On success, 0 is retured. On errors, one of the following
998 * negative error code is returned.
999 *
1000 * %-EROFS - Read only filesystem.
1001 *
1002 * %-EIO - I/O error
1003 *
1004 * %-ENOSPC - No space left on device (only in a panic state).
1005 *
1006 * %-ERESTARTSYS - Interrupted.
1007 *
1008 * %-ENOMEM - Insufficient memory available.
1009 *
1010 * %-EFAULT - Failure during execution of requested operation.
1011 */
1012static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
1013 unsigned int cmd, void __user *argp)
1014{
1015 __u64 cno;
1016 int ret;
1017 struct the_nilfs *nilfs;
1018
1019 ret = nilfs_construct_segment(inode->i_sb);
1020 if (ret < 0)
1021 return ret;
1022
1023 nilfs = inode->i_sb->s_fs_info;
1024 ret = nilfs_flush_device(nilfs);
1025 if (ret < 0)
1026 return ret;
1027
1028 if (argp != NULL) {
1029 down_read(&nilfs->ns_segctor_sem);
1030 cno = nilfs->ns_cno - 1;
1031 up_read(&nilfs->ns_segctor_sem);
1032 if (copy_to_user(argp, &cno, sizeof(cno)))
1033 return -EFAULT;
1034 }
1035 return 0;
1036}
1037
1038/**
1039 * nilfs_ioctl_resize - resize NILFS2 volume
1040 * @inode: inode object
1041 * @filp: file object
1042 * @argp: pointer on argument from userspace
1043 *
1044 * Return Value: On success, 0 is returned or error code, otherwise.
1045 */
1046static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1047 void __user *argp)
1048{
1049 __u64 newsize;
1050 int ret = -EPERM;
1051
1052 if (!capable(CAP_SYS_ADMIN))
1053 goto out;
1054
1055 ret = mnt_want_write_file(filp);
1056 if (ret)
1057 goto out;
1058
1059 ret = -EFAULT;
1060 if (copy_from_user(&newsize, argp, sizeof(newsize)))
1061 goto out_drop_write;
1062
1063 ret = nilfs_resize_fs(inode->i_sb, newsize);
1064
1065out_drop_write:
1066 mnt_drop_write_file(filp);
1067out:
1068 return ret;
1069}
1070
1071/**
1072 * nilfs_ioctl_trim_fs() - trim ioctl handle function
1073 * @inode: inode object
1074 * @argp: pointer on argument from userspace
1075 *
1076 * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1077 * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1078 * performs the actual trim operation.
1079 *
1080 * Return Value: On success, 0 is returned or negative error code, otherwise.
1081 */
1082static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1083{
1084 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1085 struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
1086 struct fstrim_range range;
1087 int ret;
1088
1089 if (!capable(CAP_SYS_ADMIN))
1090 return -EPERM;
1091
1092 if (!blk_queue_discard(q))
1093 return -EOPNOTSUPP;
1094
1095 if (copy_from_user(&range, argp, sizeof(range)))
1096 return -EFAULT;
1097
1098 range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
1099
1100 down_read(&nilfs->ns_segctor_sem);
1101 ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1102 up_read(&nilfs->ns_segctor_sem);
1103
1104 if (ret < 0)
1105 return ret;
1106
1107 if (copy_to_user(argp, &range, sizeof(range)))
1108 return -EFAULT;
1109
1110 return 0;
1111}
1112
1113/**
1114 * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1115 * @inode: inode object
1116 * @argp: pointer on argument from userspace
1117 *
1118 * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
1119 * of segments in bytes and upper limit of segments in bytes.
1120 * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1121 *
1122 * Return Value: On success, 0 is returned or error code, otherwise.
1123 */
1124static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1125{
1126 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1127 __u64 range[2];
1128 __u64 minseg, maxseg;
1129 unsigned long segbytes;
1130 int ret = -EPERM;
1131
1132 if (!capable(CAP_SYS_ADMIN))
1133 goto out;
1134
1135 ret = -EFAULT;
1136 if (copy_from_user(range, argp, sizeof(__u64[2])))
1137 goto out;
1138
1139 ret = -ERANGE;
1140 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
1141 goto out;
1142
1143 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1144
1145 minseg = range[0] + segbytes - 1;
1146 do_div(minseg, segbytes);
1147 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1148 do_div(maxseg, segbytes);
1149 maxseg--;
1150
1151 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1152out:
1153 return ret;
1154}
1155
1156/**
1157 * nilfs_ioctl_get_info - wrapping function of get metadata info
1158 * @inode: inode object
1159 * @filp: file object
1160 * @cmd: ioctl's request code
1161 * @argp: pointer on argument from userspace
1162 * @membsz: size of an item in bytes
1163 * @dofunc: concrete function of getting metadata info
1164 *
1165 * Description: nilfs_ioctl_get_info() gets metadata info by means of
1166 * calling dofunc() function.
1167 *
1168 * Return Value: On success, 0 is returned and requested metadata info
1169 * is copied into userspace. On error, one of the following
1170 * negative error codes is returned.
1171 *
1172 * %-EINVAL - Invalid arguments from userspace.
1173 *
1174 * %-ENOMEM - Insufficient amount of memory available.
1175 *
1176 * %-EFAULT - Failure during execution of requested operation.
1177 */
1178static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1179 unsigned int cmd, void __user *argp,
1180 size_t membsz,
1181 ssize_t (*dofunc)(struct the_nilfs *,
1182 __u64 *, int,
1183 void *, size_t, size_t))
1184
1185{
1186 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1187 struct nilfs_argv argv;
1188 int ret;
1189
1190 if (copy_from_user(&argv, argp, sizeof(argv)))
1191 return -EFAULT;
1192
1193 if (argv.v_size < membsz)
1194 return -EINVAL;
1195
1196 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1197 if (ret < 0)
1198 return ret;
1199
1200 if (copy_to_user(argp, &argv, sizeof(argv)))
1201 ret = -EFAULT;
1202 return ret;
1203}
1204
1205/**
1206 * nilfs_ioctl_set_suinfo - set segment usage info
1207 * @inode: inode object
1208 * @filp: file object
1209 * @cmd: ioctl's request code
1210 * @argp: pointer on argument from userspace
1211 *
1212 * Description: Expects an array of nilfs_suinfo_update structures
1213 * encapsulated in nilfs_argv and updates the segment usage info
1214 * according to the flags in nilfs_suinfo_update.
1215 *
1216 * Return Value: On success, 0 is returned. On error, one of the
1217 * following negative error codes is returned.
1218 *
1219 * %-EPERM - Not enough permissions
1220 *
1221 * %-EFAULT - Error copying input data
1222 *
1223 * %-EIO - I/O error.
1224 *
1225 * %-ENOMEM - Insufficient amount of memory available.
1226 *
1227 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1228 */
1229static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1230 unsigned int cmd, void __user *argp)
1231{
1232 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1233 struct nilfs_transaction_info ti;
1234 struct nilfs_argv argv;
1235 size_t len;
1236 void __user *base;
1237 void *kbuf;
1238 int ret;
1239
1240 if (!capable(CAP_SYS_ADMIN))
1241 return -EPERM;
1242
1243 ret = mnt_want_write_file(filp);
1244 if (ret)
1245 return ret;
1246
1247 ret = -EFAULT;
1248 if (copy_from_user(&argv, argp, sizeof(argv)))
1249 goto out;
1250
1251 ret = -EINVAL;
1252 if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1253 goto out;
1254
1255 if (argv.v_nmembs > nilfs->ns_nsegments)
1256 goto out;
1257
1258 if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1259 goto out;
1260
1261 len = argv.v_size * argv.v_nmembs;
1262 if (!len) {
1263 ret = 0;
1264 goto out;
1265 }
1266
1267 base = (void __user *)(unsigned long)argv.v_base;
1268 kbuf = vmalloc(len);
1269 if (!kbuf) {
1270 ret = -ENOMEM;
1271 goto out;
1272 }
1273
1274 if (copy_from_user(kbuf, base, len)) {
1275 ret = -EFAULT;
1276 goto out_free;
1277 }
1278
1279 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1280 ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1281 argv.v_nmembs);
1282 if (unlikely(ret < 0))
1283 nilfs_transaction_abort(inode->i_sb);
1284 else
1285 nilfs_transaction_commit(inode->i_sb); /* never fails */
1286
1287out_free:
1288 vfree(kbuf);
1289out:
1290 mnt_drop_write_file(filp);
1291 return ret;
1292}
1293
1294long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1295{
1296 struct inode *inode = file_inode(filp);
1297 void __user *argp = (void __user *)arg;
1298
1299 switch (cmd) {
1300 case FS_IOC_GETFLAGS:
1301 return nilfs_ioctl_getflags(inode, argp);
1302 case FS_IOC_SETFLAGS:
1303 return nilfs_ioctl_setflags(inode, filp, argp);
1304 case FS_IOC_GETVERSION:
1305 return nilfs_ioctl_getversion(inode, argp);
1306 case NILFS_IOCTL_CHANGE_CPMODE:
1307 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1308 case NILFS_IOCTL_DELETE_CHECKPOINT:
1309 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1310 case NILFS_IOCTL_GET_CPINFO:
1311 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1312 sizeof(struct nilfs_cpinfo),
1313 nilfs_ioctl_do_get_cpinfo);
1314 case NILFS_IOCTL_GET_CPSTAT:
1315 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1316 case NILFS_IOCTL_GET_SUINFO:
1317 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1318 sizeof(struct nilfs_suinfo),
1319 nilfs_ioctl_do_get_suinfo);
1320 case NILFS_IOCTL_SET_SUINFO:
1321 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
1322 case NILFS_IOCTL_GET_SUSTAT:
1323 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1324 case NILFS_IOCTL_GET_VINFO:
1325 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1326 sizeof(struct nilfs_vinfo),
1327 nilfs_ioctl_do_get_vinfo);
1328 case NILFS_IOCTL_GET_BDESCS:
1329 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1330 case NILFS_IOCTL_CLEAN_SEGMENTS:
1331 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
1332 case NILFS_IOCTL_SYNC:
1333 return nilfs_ioctl_sync(inode, filp, cmd, argp);
1334 case NILFS_IOCTL_RESIZE:
1335 return nilfs_ioctl_resize(inode, filp, argp);
1336 case NILFS_IOCTL_SET_ALLOC_RANGE:
1337 return nilfs_ioctl_set_alloc_range(inode, argp);
1338 case FITRIM:
1339 return nilfs_ioctl_trim_fs(inode, argp);
1340 default:
1341 return -ENOTTY;
1342 }
1343}
1344
1345#ifdef CONFIG_COMPAT
1346long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1347{
1348 switch (cmd) {
1349 case FS_IOC32_GETFLAGS:
1350 cmd = FS_IOC_GETFLAGS;
1351 break;
1352 case FS_IOC32_SETFLAGS:
1353 cmd = FS_IOC_SETFLAGS;
1354 break;
1355 case FS_IOC32_GETVERSION:
1356 cmd = FS_IOC_GETVERSION;
1357 break;
1358 case NILFS_IOCTL_CHANGE_CPMODE:
1359 case NILFS_IOCTL_DELETE_CHECKPOINT:
1360 case NILFS_IOCTL_GET_CPINFO:
1361 case NILFS_IOCTL_GET_CPSTAT:
1362 case NILFS_IOCTL_GET_SUINFO:
1363 case NILFS_IOCTL_SET_SUINFO:
1364 case NILFS_IOCTL_GET_SUSTAT:
1365 case NILFS_IOCTL_GET_VINFO:
1366 case NILFS_IOCTL_GET_BDESCS:
1367 case NILFS_IOCTL_CLEAN_SEGMENTS:
1368 case NILFS_IOCTL_SYNC:
1369 case NILFS_IOCTL_RESIZE:
1370 case NILFS_IOCTL_SET_ALLOC_RANGE:
1371 break;
1372 default:
1373 return -ENOIOCTLCMD;
1374 }
1375 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1376}
1377#endif