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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_file(), mnt_drop_write_file() */
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_file(filp);
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_file(filp);
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_file(filp);
178 if (ret)
179 return ret;
180
181 ret = -EFAULT;
182 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
183 goto out;
184
185 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
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 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
196out:
197 mnt_drop_write_file(filp);
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_file(filp);
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_file(filp);
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_file(filp);
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 if (nsegs > UINT_MAX / sizeof(__u64))
607 goto out;
608
609 /*
610 * argv[4] points to segment numbers this ioctl cleans. We
611 * use kmalloc() for its buffer because memory used for the
612 * segment numbers is enough small.
613 */
614 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
615 nsegs * sizeof(__u64));
616 if (IS_ERR(kbufs[4])) {
617 ret = PTR_ERR(kbufs[4]);
618 goto out;
619 }
620 nilfs = inode->i_sb->s_fs_info;
621
622 for (n = 0; n < 4; n++) {
623 ret = -EINVAL;
624 if (argv[n].v_size != argsz[n])
625 goto out_free;
626
627 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
628 goto out_free;
629
630 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
631 goto out_free;
632
633 len = argv[n].v_size * argv[n].v_nmembs;
634 base = (void __user *)(unsigned long)argv[n].v_base;
635 if (len == 0) {
636 kbufs[n] = NULL;
637 continue;
638 }
639
640 kbufs[n] = vmalloc(len);
641 if (!kbufs[n]) {
642 ret = -ENOMEM;
643 goto out_free;
644 }
645 if (copy_from_user(kbufs[n], base, len)) {
646 ret = -EFAULT;
647 vfree(kbufs[n]);
648 goto out_free;
649 }
650 }
651
652 /*
653 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
654 * which will operates an inode list without blocking.
655 * To protect the list from concurrent operations,
656 * nilfs_ioctl_move_blocks should be atomic operation.
657 */
658 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
659 ret = -EBUSY;
660 goto out_free;
661 }
662
663 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
664
665 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
666 if (ret < 0)
667 printk(KERN_ERR "NILFS: GC failed during preparation: "
668 "cannot read source blocks: err=%d\n", ret);
669 else
670 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
671
672 nilfs_remove_all_gcinodes(nilfs);
673 clear_nilfs_gc_running(nilfs);
674
675out_free:
676 while (--n >= 0)
677 vfree(kbufs[n]);
678 kfree(kbufs[4]);
679out:
680 mnt_drop_write_file(filp);
681 return ret;
682}
683
684static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
685 unsigned int cmd, void __user *argp)
686{
687 __u64 cno;
688 int ret;
689 struct the_nilfs *nilfs;
690
691 ret = nilfs_construct_segment(inode->i_sb);
692 if (ret < 0)
693 return ret;
694
695 nilfs = inode->i_sb->s_fs_info;
696 if (nilfs_test_opt(nilfs, BARRIER)) {
697 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
698 if (ret == -EIO)
699 return ret;
700 }
701
702 if (argp != NULL) {
703 down_read(&nilfs->ns_segctor_sem);
704 cno = nilfs->ns_cno - 1;
705 up_read(&nilfs->ns_segctor_sem);
706 if (copy_to_user(argp, &cno, sizeof(cno)))
707 return -EFAULT;
708 }
709 return 0;
710}
711
712static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
713 void __user *argp)
714{
715 __u64 newsize;
716 int ret = -EPERM;
717
718 if (!capable(CAP_SYS_ADMIN))
719 goto out;
720
721 ret = mnt_want_write_file(filp);
722 if (ret)
723 goto out;
724
725 ret = -EFAULT;
726 if (copy_from_user(&newsize, argp, sizeof(newsize)))
727 goto out_drop_write;
728
729 ret = nilfs_resize_fs(inode->i_sb, newsize);
730
731out_drop_write:
732 mnt_drop_write_file(filp);
733out:
734 return ret;
735}
736
737static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
738{
739 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
740 __u64 range[2];
741 __u64 minseg, maxseg;
742 unsigned long segbytes;
743 int ret = -EPERM;
744
745 if (!capable(CAP_SYS_ADMIN))
746 goto out;
747
748 ret = -EFAULT;
749 if (copy_from_user(range, argp, sizeof(__u64[2])))
750 goto out;
751
752 ret = -ERANGE;
753 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
754 goto out;
755
756 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
757
758 minseg = range[0] + segbytes - 1;
759 do_div(minseg, segbytes);
760 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
761 do_div(maxseg, segbytes);
762 maxseg--;
763
764 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
765out:
766 return ret;
767}
768
769static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
770 unsigned int cmd, void __user *argp,
771 size_t membsz,
772 ssize_t (*dofunc)(struct the_nilfs *,
773 __u64 *, int,
774 void *, size_t, size_t))
775
776{
777 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
778 struct nilfs_argv argv;
779 int ret;
780
781 if (copy_from_user(&argv, argp, sizeof(argv)))
782 return -EFAULT;
783
784 if (argv.v_size < membsz)
785 return -EINVAL;
786
787 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
788 if (ret < 0)
789 return ret;
790
791 if (copy_to_user(argp, &argv, sizeof(argv)))
792 ret = -EFAULT;
793 return ret;
794}
795
796long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
797{
798 struct inode *inode = filp->f_dentry->d_inode;
799 void __user *argp = (void __user *)arg;
800
801 switch (cmd) {
802 case FS_IOC_GETFLAGS:
803 return nilfs_ioctl_getflags(inode, argp);
804 case FS_IOC_SETFLAGS:
805 return nilfs_ioctl_setflags(inode, filp, argp);
806 case FS_IOC_GETVERSION:
807 return nilfs_ioctl_getversion(inode, argp);
808 case NILFS_IOCTL_CHANGE_CPMODE:
809 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
810 case NILFS_IOCTL_DELETE_CHECKPOINT:
811 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
812 case NILFS_IOCTL_GET_CPINFO:
813 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
814 sizeof(struct nilfs_cpinfo),
815 nilfs_ioctl_do_get_cpinfo);
816 case NILFS_IOCTL_GET_CPSTAT:
817 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
818 case NILFS_IOCTL_GET_SUINFO:
819 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
820 sizeof(struct nilfs_suinfo),
821 nilfs_ioctl_do_get_suinfo);
822 case NILFS_IOCTL_GET_SUSTAT:
823 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
824 case NILFS_IOCTL_GET_VINFO:
825 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
826 sizeof(struct nilfs_vinfo),
827 nilfs_ioctl_do_get_vinfo);
828 case NILFS_IOCTL_GET_BDESCS:
829 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
830 case NILFS_IOCTL_CLEAN_SEGMENTS:
831 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
832 case NILFS_IOCTL_SYNC:
833 return nilfs_ioctl_sync(inode, filp, cmd, argp);
834 case NILFS_IOCTL_RESIZE:
835 return nilfs_ioctl_resize(inode, filp, argp);
836 case NILFS_IOCTL_SET_ALLOC_RANGE:
837 return nilfs_ioctl_set_alloc_range(inode, argp);
838 default:
839 return -ENOTTY;
840 }
841}
842
843#ifdef CONFIG_COMPAT
844long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
845{
846 switch (cmd) {
847 case FS_IOC32_GETFLAGS:
848 cmd = FS_IOC_GETFLAGS;
849 break;
850 case FS_IOC32_SETFLAGS:
851 cmd = FS_IOC_SETFLAGS;
852 break;
853 case FS_IOC32_GETVERSION:
854 cmd = FS_IOC_GETVERSION;
855 break;
856 case NILFS_IOCTL_CHANGE_CPMODE:
857 case NILFS_IOCTL_DELETE_CHECKPOINT:
858 case NILFS_IOCTL_GET_CPINFO:
859 case NILFS_IOCTL_GET_CPSTAT:
860 case NILFS_IOCTL_GET_SUINFO:
861 case NILFS_IOCTL_GET_SUSTAT:
862 case NILFS_IOCTL_GET_VINFO:
863 case NILFS_IOCTL_GET_BDESCS:
864 case NILFS_IOCTL_CLEAN_SEGMENTS:
865 case NILFS_IOCTL_SYNC:
866 case NILFS_IOCTL_RESIZE:
867 case NILFS_IOCTL_SET_ALLOC_RANGE:
868 break;
869 default:
870 return -ENOIOCTLCMD;
871 }
872 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
873}
874#endif
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * ioctl.c - NILFS ioctl operations.
4 *
5 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato.
8 */
9
10#include <linux/fs.h>
11#include <linux/wait.h>
12#include <linux/slab.h>
13#include <linux/capability.h> /* capable() */
14#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
15#include <linux/vmalloc.h>
16#include <linux/compat.h> /* compat_ptr() */
17#include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */
18#include <linux/buffer_head.h>
19#include "nilfs.h"
20#include "segment.h"
21#include "bmap.h"
22#include "cpfile.h"
23#include "sufile.h"
24#include "dat.h"
25
26/**
27 * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
28 * @nilfs: nilfs object
29 * @argv: vector of arguments from userspace
30 * @dir: set of direction flags
31 * @dofunc: concrete function of get/set metadata info
32 *
33 * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
34 * calling dofunc() function on the basis of @argv argument.
35 *
36 * Return Value: On success, 0 is returned and requested metadata info
37 * is copied into userspace. On error, one of the following
38 * negative error codes is returned.
39 *
40 * %-EINVAL - Invalid arguments from userspace.
41 *
42 * %-ENOMEM - Insufficient amount of memory available.
43 *
44 * %-EFAULT - Failure during execution of requested operation.
45 */
46static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
47 struct nilfs_argv *argv, int dir,
48 ssize_t (*dofunc)(struct the_nilfs *,
49 __u64 *, int,
50 void *, size_t, size_t))
51{
52 void *buf;
53 void __user *base = (void __user *)(unsigned long)argv->v_base;
54 size_t maxmembs, total, n;
55 ssize_t nr;
56 int ret, i;
57 __u64 pos, ppos;
58
59 if (argv->v_nmembs == 0)
60 return 0;
61
62 if (argv->v_size > PAGE_SIZE)
63 return -EINVAL;
64
65 /*
66 * Reject pairs of a start item position (argv->v_index) and a
67 * total count (argv->v_nmembs) which leads position 'pos' to
68 * overflow by the increment at the end of the loop.
69 */
70 if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
71 return -EINVAL;
72
73 buf = (void *)__get_free_pages(GFP_NOFS, 0);
74 if (unlikely(!buf))
75 return -ENOMEM;
76 maxmembs = PAGE_SIZE / argv->v_size;
77
78 ret = 0;
79 total = 0;
80 pos = argv->v_index;
81 for (i = 0; i < argv->v_nmembs; i += n) {
82 n = (argv->v_nmembs - i < maxmembs) ?
83 argv->v_nmembs - i : maxmembs;
84 if ((dir & _IOC_WRITE) &&
85 copy_from_user(buf, base + argv->v_size * i,
86 argv->v_size * n)) {
87 ret = -EFAULT;
88 break;
89 }
90 ppos = pos;
91 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
92 n);
93 if (nr < 0) {
94 ret = nr;
95 break;
96 }
97 if ((dir & _IOC_READ) &&
98 copy_to_user(base + argv->v_size * i, buf,
99 argv->v_size * nr)) {
100 ret = -EFAULT;
101 break;
102 }
103 total += nr;
104 if ((size_t)nr < n)
105 break;
106 if (pos == ppos)
107 pos += n;
108 }
109 argv->v_nmembs = total;
110
111 free_pages((unsigned long)buf, 0);
112 return ret;
113}
114
115/**
116 * nilfs_ioctl_getflags - ioctl to support lsattr
117 */
118static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
119{
120 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
121
122 return put_user(flags, (int __user *)argp);
123}
124
125/**
126 * nilfs_ioctl_setflags - ioctl to support chattr
127 */
128static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
129 void __user *argp)
130{
131 struct nilfs_transaction_info ti;
132 unsigned int flags, oldflags;
133 int ret;
134
135 if (!inode_owner_or_capable(inode))
136 return -EACCES;
137
138 if (get_user(flags, (int __user *)argp))
139 return -EFAULT;
140
141 ret = mnt_want_write_file(filp);
142 if (ret)
143 return ret;
144
145 flags = nilfs_mask_flags(inode->i_mode, flags);
146
147 inode_lock(inode);
148
149 oldflags = NILFS_I(inode)->i_flags;
150
151 ret = vfs_ioc_setflags_prepare(inode, oldflags, flags);
152 if (ret)
153 goto out;
154
155 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
156 if (ret)
157 goto out;
158
159 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
160 (flags & FS_FL_USER_MODIFIABLE);
161
162 nilfs_set_inode_flags(inode);
163 inode->i_ctime = current_time(inode);
164 if (IS_SYNC(inode))
165 nilfs_set_transaction_flag(NILFS_TI_SYNC);
166
167 nilfs_mark_inode_dirty(inode);
168 ret = nilfs_transaction_commit(inode->i_sb);
169out:
170 inode_unlock(inode);
171 mnt_drop_write_file(filp);
172 return ret;
173}
174
175/**
176 * nilfs_ioctl_getversion - get info about a file's version (generation number)
177 */
178static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
179{
180 return put_user(inode->i_generation, (int __user *)argp);
181}
182
183/**
184 * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
185 * @inode: inode object
186 * @filp: file object
187 * @cmd: ioctl's request code
188 * @argp: pointer on argument from userspace
189 *
190 * Description: nilfs_ioctl_change_cpmode() function changes mode of
191 * given checkpoint between checkpoint and snapshot state. This ioctl
192 * is used in chcp and mkcp utilities.
193 *
194 * Return Value: On success, 0 is returned and mode of a checkpoint is
195 * changed. On error, one of the following negative error codes
196 * is returned.
197 *
198 * %-EPERM - Operation not permitted.
199 *
200 * %-EFAULT - Failure during checkpoint mode changing.
201 */
202static int nilfs_ioctl_change_cpmode(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 struct nilfs_cpmode cpmode;
208 int ret;
209
210 if (!capable(CAP_SYS_ADMIN))
211 return -EPERM;
212
213 ret = mnt_want_write_file(filp);
214 if (ret)
215 return ret;
216
217 ret = -EFAULT;
218 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
219 goto out;
220
221 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
222
223 nilfs_transaction_begin(inode->i_sb, &ti, 0);
224 ret = nilfs_cpfile_change_cpmode(
225 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
226 if (unlikely(ret < 0))
227 nilfs_transaction_abort(inode->i_sb);
228 else
229 nilfs_transaction_commit(inode->i_sb); /* never fails */
230
231 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
232out:
233 mnt_drop_write_file(filp);
234 return ret;
235}
236
237/**
238 * nilfs_ioctl_delete_checkpoint - remove checkpoint
239 * @inode: inode object
240 * @filp: file object
241 * @cmd: ioctl's request code
242 * @argp: pointer on argument from userspace
243 *
244 * Description: nilfs_ioctl_delete_checkpoint() function removes
245 * checkpoint from NILFS2 file system. This ioctl is used in rmcp
246 * utility.
247 *
248 * Return Value: On success, 0 is returned and a checkpoint is
249 * removed. On error, one of the following negative error codes
250 * is returned.
251 *
252 * %-EPERM - Operation not permitted.
253 *
254 * %-EFAULT - Failure during checkpoint removing.
255 */
256static int
257nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
258 unsigned int cmd, void __user *argp)
259{
260 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
261 struct nilfs_transaction_info ti;
262 __u64 cno;
263 int ret;
264
265 if (!capable(CAP_SYS_ADMIN))
266 return -EPERM;
267
268 ret = mnt_want_write_file(filp);
269 if (ret)
270 return ret;
271
272 ret = -EFAULT;
273 if (copy_from_user(&cno, argp, sizeof(cno)))
274 goto out;
275
276 nilfs_transaction_begin(inode->i_sb, &ti, 0);
277 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
278 if (unlikely(ret < 0))
279 nilfs_transaction_abort(inode->i_sb);
280 else
281 nilfs_transaction_commit(inode->i_sb); /* never fails */
282out:
283 mnt_drop_write_file(filp);
284 return ret;
285}
286
287/**
288 * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
289 * @nilfs: nilfs object
290 * @posp: pointer on array of checkpoint's numbers
291 * @flags: checkpoint mode (checkpoint or snapshot)
292 * @buf: buffer for storing checkponts' info
293 * @size: size in bytes of one checkpoint info item in array
294 * @nmembs: number of checkpoints in array (numbers and infos)
295 *
296 * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
297 * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
298 * lscp utility and by nilfs_cleanerd daemon.
299 *
300 * Return value: count of nilfs_cpinfo structures in output buffer.
301 */
302static ssize_t
303nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
304 void *buf, size_t size, size_t nmembs)
305{
306 int ret;
307
308 down_read(&nilfs->ns_segctor_sem);
309 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
310 size, nmembs);
311 up_read(&nilfs->ns_segctor_sem);
312 return ret;
313}
314
315/**
316 * nilfs_ioctl_get_cpstat - get checkpoints statistics
317 * @inode: inode object
318 * @filp: file object
319 * @cmd: ioctl's request code
320 * @argp: pointer on argument from userspace
321 *
322 * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
323 * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
324 * and by nilfs_cleanerd daemon.
325 *
326 * Return Value: On success, 0 is returned, and checkpoints information is
327 * copied into userspace pointer @argp. On error, one of the following
328 * negative error codes is returned.
329 *
330 * %-EIO - I/O error.
331 *
332 * %-ENOMEM - Insufficient amount of memory available.
333 *
334 * %-EFAULT - Failure during getting checkpoints statistics.
335 */
336static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
337 unsigned int cmd, void __user *argp)
338{
339 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
340 struct nilfs_cpstat cpstat;
341 int ret;
342
343 down_read(&nilfs->ns_segctor_sem);
344 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
345 up_read(&nilfs->ns_segctor_sem);
346 if (ret < 0)
347 return ret;
348
349 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
350 ret = -EFAULT;
351 return ret;
352}
353
354/**
355 * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
356 * @nilfs: nilfs object
357 * @posp: pointer on array of segment numbers
358 * @flags: *not used*
359 * @buf: buffer for storing suinfo array
360 * @size: size in bytes of one suinfo item in array
361 * @nmembs: count of segment numbers and suinfos in array
362 *
363 * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
364 * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
365 * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
366 *
367 * Return value: count of nilfs_suinfo structures in output buffer.
368 */
369static ssize_t
370nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
371 void *buf, size_t size, size_t nmembs)
372{
373 int ret;
374
375 down_read(&nilfs->ns_segctor_sem);
376 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
377 nmembs);
378 up_read(&nilfs->ns_segctor_sem);
379 return ret;
380}
381
382/**
383 * nilfs_ioctl_get_sustat - get segment usage statistics
384 * @inode: inode object
385 * @filp: file object
386 * @cmd: ioctl's request code
387 * @argp: pointer on argument from userspace
388 *
389 * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
390 * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
391 * and by nilfs_cleanerd daemon.
392 *
393 * Return Value: On success, 0 is returned, and segment usage information is
394 * copied into userspace pointer @argp. On error, one of the following
395 * negative error codes is returned.
396 *
397 * %-EIO - I/O error.
398 *
399 * %-ENOMEM - Insufficient amount of memory available.
400 *
401 * %-EFAULT - Failure during getting segment usage statistics.
402 */
403static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
404 unsigned int cmd, void __user *argp)
405{
406 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
407 struct nilfs_sustat sustat;
408 int ret;
409
410 down_read(&nilfs->ns_segctor_sem);
411 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
412 up_read(&nilfs->ns_segctor_sem);
413 if (ret < 0)
414 return ret;
415
416 if (copy_to_user(argp, &sustat, sizeof(sustat)))
417 ret = -EFAULT;
418 return ret;
419}
420
421/**
422 * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
423 * @nilfs: nilfs object
424 * @posp: *not used*
425 * @flags: *not used*
426 * @buf: buffer for storing array of nilfs_vinfo structures
427 * @size: size in bytes of one vinfo item in array
428 * @nmembs: count of vinfos in array
429 *
430 * Description: nilfs_ioctl_do_get_vinfo() function returns information
431 * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
432 * by nilfs_cleanerd daemon.
433 *
434 * Return value: count of nilfs_vinfo structures in output buffer.
435 */
436static ssize_t
437nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
438 void *buf, size_t size, size_t nmembs)
439{
440 int ret;
441
442 down_read(&nilfs->ns_segctor_sem);
443 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
444 up_read(&nilfs->ns_segctor_sem);
445 return ret;
446}
447
448/**
449 * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
450 * @nilfs: nilfs object
451 * @posp: *not used*
452 * @flags: *not used*
453 * @buf: buffer for storing array of nilfs_bdesc structures
454 * @size: size in bytes of one bdesc item in array
455 * @nmembs: count of bdescs in array
456 *
457 * Description: nilfs_ioctl_do_get_bdescs() function returns information
458 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
459 * is used by nilfs_cleanerd daemon.
460 *
461 * Return value: count of nilfs_bdescs structures in output buffer.
462 */
463static ssize_t
464nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
465 void *buf, size_t size, size_t nmembs)
466{
467 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
468 struct nilfs_bdesc *bdescs = buf;
469 int ret, i;
470
471 down_read(&nilfs->ns_segctor_sem);
472 for (i = 0; i < nmembs; i++) {
473 ret = nilfs_bmap_lookup_at_level(bmap,
474 bdescs[i].bd_offset,
475 bdescs[i].bd_level + 1,
476 &bdescs[i].bd_blocknr);
477 if (ret < 0) {
478 if (ret != -ENOENT) {
479 up_read(&nilfs->ns_segctor_sem);
480 return ret;
481 }
482 bdescs[i].bd_blocknr = 0;
483 }
484 }
485 up_read(&nilfs->ns_segctor_sem);
486 return nmembs;
487}
488
489/**
490 * nilfs_ioctl_get_bdescs - get disk block descriptors
491 * @inode: inode object
492 * @filp: file object
493 * @cmd: ioctl's request code
494 * @argp: pointer on argument from userspace
495 *
496 * Description: nilfs_ioctl_do_get_bdescs() function returns information
497 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
498 * is used by nilfs_cleanerd daemon.
499 *
500 * Return Value: On success, 0 is returned, and disk block descriptors are
501 * copied into userspace pointer @argp. On error, one of the following
502 * negative error codes is returned.
503 *
504 * %-EINVAL - Invalid arguments from userspace.
505 *
506 * %-EIO - I/O error.
507 *
508 * %-ENOMEM - Insufficient amount of memory available.
509 *
510 * %-EFAULT - Failure during getting disk block descriptors.
511 */
512static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
513 unsigned int cmd, void __user *argp)
514{
515 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
516 struct nilfs_argv argv;
517 int ret;
518
519 if (copy_from_user(&argv, argp, sizeof(argv)))
520 return -EFAULT;
521
522 if (argv.v_size != sizeof(struct nilfs_bdesc))
523 return -EINVAL;
524
525 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
526 nilfs_ioctl_do_get_bdescs);
527 if (ret < 0)
528 return ret;
529
530 if (copy_to_user(argp, &argv, sizeof(argv)))
531 ret = -EFAULT;
532 return ret;
533}
534
535/**
536 * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
537 * @inode: inode object
538 * @vdesc: descriptor of virtual block number
539 * @buffers: list of moving buffers
540 *
541 * Description: nilfs_ioctl_move_inode_block() function registers data/node
542 * buffer in the GC pagecache and submit read request.
543 *
544 * Return Value: On success, 0 is returned. On error, one of the following
545 * negative error codes is returned.
546 *
547 * %-EIO - I/O error.
548 *
549 * %-ENOMEM - Insufficient amount of memory available.
550 *
551 * %-ENOENT - Requested block doesn't exist.
552 *
553 * %-EEXIST - Blocks conflict is detected.
554 */
555static int nilfs_ioctl_move_inode_block(struct inode *inode,
556 struct nilfs_vdesc *vdesc,
557 struct list_head *buffers)
558{
559 struct buffer_head *bh;
560 int ret;
561
562 if (vdesc->vd_flags == 0)
563 ret = nilfs_gccache_submit_read_data(
564 inode, vdesc->vd_offset, vdesc->vd_blocknr,
565 vdesc->vd_vblocknr, &bh);
566 else
567 ret = nilfs_gccache_submit_read_node(
568 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
569
570 if (unlikely(ret < 0)) {
571 if (ret == -ENOENT)
572 nilfs_crit(inode->i_sb,
573 "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
574 __func__, vdesc->vd_flags ? "node" : "data",
575 (unsigned long long)vdesc->vd_ino,
576 (unsigned long long)vdesc->vd_cno,
577 (unsigned long long)vdesc->vd_offset,
578 (unsigned long long)vdesc->vd_blocknr,
579 (unsigned long long)vdesc->vd_vblocknr);
580 return ret;
581 }
582 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
583 nilfs_crit(inode->i_sb,
584 "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
585 __func__, vdesc->vd_flags ? "node" : "data",
586 (unsigned long long)vdesc->vd_ino,
587 (unsigned long long)vdesc->vd_cno,
588 (unsigned long long)vdesc->vd_offset,
589 (unsigned long long)vdesc->vd_blocknr,
590 (unsigned long long)vdesc->vd_vblocknr);
591 brelse(bh);
592 return -EEXIST;
593 }
594 list_add_tail(&bh->b_assoc_buffers, buffers);
595 return 0;
596}
597
598/**
599 * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
600 * @sb: superblock object
601 * @argv: vector of arguments from userspace
602 * @buf: array of nilfs_vdesc structures
603 *
604 * Description: nilfs_ioctl_move_blocks() function reads valid data/node
605 * blocks that garbage collector specified with the array of nilfs_vdesc
606 * structures and stores them into page caches of GC inodes.
607 *
608 * Return Value: Number of processed nilfs_vdesc structures or
609 * error code, otherwise.
610 */
611static int nilfs_ioctl_move_blocks(struct super_block *sb,
612 struct nilfs_argv *argv, void *buf)
613{
614 size_t nmembs = argv->v_nmembs;
615 struct the_nilfs *nilfs = sb->s_fs_info;
616 struct inode *inode;
617 struct nilfs_vdesc *vdesc;
618 struct buffer_head *bh, *n;
619 LIST_HEAD(buffers);
620 ino_t ino;
621 __u64 cno;
622 int i, ret;
623
624 for (i = 0, vdesc = buf; i < nmembs; ) {
625 ino = vdesc->vd_ino;
626 cno = vdesc->vd_cno;
627 inode = nilfs_iget_for_gc(sb, ino, cno);
628 if (IS_ERR(inode)) {
629 ret = PTR_ERR(inode);
630 goto failed;
631 }
632 if (list_empty(&NILFS_I(inode)->i_dirty)) {
633 /*
634 * Add the inode to GC inode list. Garbage Collection
635 * is serialized and no two processes manipulate the
636 * list simultaneously.
637 */
638 igrab(inode);
639 list_add(&NILFS_I(inode)->i_dirty,
640 &nilfs->ns_gc_inodes);
641 }
642
643 do {
644 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
645 &buffers);
646 if (unlikely(ret < 0)) {
647 iput(inode);
648 goto failed;
649 }
650 vdesc++;
651 } while (++i < nmembs &&
652 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
653
654 iput(inode); /* The inode still remains in GC inode list */
655 }
656
657 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
658 ret = nilfs_gccache_wait_and_mark_dirty(bh);
659 if (unlikely(ret < 0)) {
660 WARN_ON(ret == -EEXIST);
661 goto failed;
662 }
663 list_del_init(&bh->b_assoc_buffers);
664 brelse(bh);
665 }
666 return nmembs;
667
668 failed:
669 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
670 list_del_init(&bh->b_assoc_buffers);
671 brelse(bh);
672 }
673 return ret;
674}
675
676/**
677 * nilfs_ioctl_delete_checkpoints - delete checkpoints
678 * @nilfs: nilfs object
679 * @argv: vector of arguments from userspace
680 * @buf: array of periods of checkpoints numbers
681 *
682 * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
683 * in the period from p_start to p_end, excluding p_end itself. The checkpoints
684 * which have been already deleted are ignored.
685 *
686 * Return Value: Number of processed nilfs_period structures or
687 * error code, otherwise.
688 *
689 * %-EIO - I/O error.
690 *
691 * %-ENOMEM - Insufficient amount of memory available.
692 *
693 * %-EINVAL - invalid checkpoints.
694 */
695static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
696 struct nilfs_argv *argv, void *buf)
697{
698 size_t nmembs = argv->v_nmembs;
699 struct inode *cpfile = nilfs->ns_cpfile;
700 struct nilfs_period *periods = buf;
701 int ret, i;
702
703 for (i = 0; i < nmembs; i++) {
704 ret = nilfs_cpfile_delete_checkpoints(
705 cpfile, periods[i].p_start, periods[i].p_end);
706 if (ret < 0)
707 return ret;
708 }
709 return nmembs;
710}
711
712/**
713 * nilfs_ioctl_free_vblocknrs - free virtual block numbers
714 * @nilfs: nilfs object
715 * @argv: vector of arguments from userspace
716 * @buf: array of virtual block numbers
717 *
718 * Description: nilfs_ioctl_free_vblocknrs() function frees
719 * the virtual block numbers specified by @buf and @argv->v_nmembs.
720 *
721 * Return Value: Number of processed virtual block numbers or
722 * error code, otherwise.
723 *
724 * %-EIO - I/O error.
725 *
726 * %-ENOMEM - Insufficient amount of memory available.
727 *
728 * %-ENOENT - The virtual block number have not been allocated.
729 */
730static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
731 struct nilfs_argv *argv, void *buf)
732{
733 size_t nmembs = argv->v_nmembs;
734 int ret;
735
736 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
737
738 return (ret < 0) ? ret : nmembs;
739}
740
741/**
742 * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
743 * @nilfs: nilfs object
744 * @argv: vector of arguments from userspace
745 * @buf: array of block descriptors
746 *
747 * Description: nilfs_ioctl_mark_blocks_dirty() function marks
748 * metadata file or data blocks as dirty.
749 *
750 * Return Value: Number of processed block descriptors or
751 * error code, otherwise.
752 *
753 * %-ENOMEM - Insufficient memory available.
754 *
755 * %-EIO - I/O error
756 *
757 * %-ENOENT - the specified block does not exist (hole block)
758 */
759static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
760 struct nilfs_argv *argv, void *buf)
761{
762 size_t nmembs = argv->v_nmembs;
763 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
764 struct nilfs_bdesc *bdescs = buf;
765 struct buffer_head *bh;
766 int ret, i;
767
768 for (i = 0; i < nmembs; i++) {
769 /* XXX: use macro or inline func to check liveness */
770 ret = nilfs_bmap_lookup_at_level(bmap,
771 bdescs[i].bd_offset,
772 bdescs[i].bd_level + 1,
773 &bdescs[i].bd_blocknr);
774 if (ret < 0) {
775 if (ret != -ENOENT)
776 return ret;
777 bdescs[i].bd_blocknr = 0;
778 }
779 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
780 /* skip dead block */
781 continue;
782 if (bdescs[i].bd_level == 0) {
783 ret = nilfs_mdt_get_block(nilfs->ns_dat,
784 bdescs[i].bd_offset,
785 false, NULL, &bh);
786 if (unlikely(ret)) {
787 WARN_ON(ret == -ENOENT);
788 return ret;
789 }
790 mark_buffer_dirty(bh);
791 nilfs_mdt_mark_dirty(nilfs->ns_dat);
792 put_bh(bh);
793 } else {
794 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
795 bdescs[i].bd_level);
796 if (ret < 0) {
797 WARN_ON(ret == -ENOENT);
798 return ret;
799 }
800 }
801 }
802 return nmembs;
803}
804
805int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
806 struct nilfs_argv *argv, void **kbufs)
807{
808 const char *msg;
809 int ret;
810
811 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
812 if (ret < 0) {
813 /*
814 * can safely abort because checkpoints can be removed
815 * independently.
816 */
817 msg = "cannot delete checkpoints";
818 goto failed;
819 }
820 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
821 if (ret < 0) {
822 /*
823 * can safely abort because DAT file is updated atomically
824 * using a copy-on-write technique.
825 */
826 msg = "cannot delete virtual blocks from DAT file";
827 goto failed;
828 }
829 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
830 if (ret < 0) {
831 /*
832 * can safely abort because the operation is nondestructive.
833 */
834 msg = "cannot mark copying blocks dirty";
835 goto failed;
836 }
837 return 0;
838
839 failed:
840 nilfs_err(nilfs->ns_sb, "error %d preparing GC: %s", ret, msg);
841 return ret;
842}
843
844/**
845 * nilfs_ioctl_clean_segments - clean segments
846 * @inode: inode object
847 * @filp: file object
848 * @cmd: ioctl's request code
849 * @argp: pointer on argument from userspace
850 *
851 * Description: nilfs_ioctl_clean_segments() function makes garbage
852 * collection operation in the environment of requested parameters
853 * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
854 * nilfs_cleanerd daemon.
855 *
856 * Return Value: On success, 0 is returned or error code, otherwise.
857 */
858static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
859 unsigned int cmd, void __user *argp)
860{
861 struct nilfs_argv argv[5];
862 static const size_t argsz[5] = {
863 sizeof(struct nilfs_vdesc),
864 sizeof(struct nilfs_period),
865 sizeof(__u64),
866 sizeof(struct nilfs_bdesc),
867 sizeof(__u64),
868 };
869 void __user *base;
870 void *kbufs[5];
871 struct the_nilfs *nilfs;
872 size_t len, nsegs;
873 int n, ret;
874
875 if (!capable(CAP_SYS_ADMIN))
876 return -EPERM;
877
878 ret = mnt_want_write_file(filp);
879 if (ret)
880 return ret;
881
882 ret = -EFAULT;
883 if (copy_from_user(argv, argp, sizeof(argv)))
884 goto out;
885
886 ret = -EINVAL;
887 nsegs = argv[4].v_nmembs;
888 if (argv[4].v_size != argsz[4])
889 goto out;
890 if (nsegs > UINT_MAX / sizeof(__u64))
891 goto out;
892
893 /*
894 * argv[4] points to segment numbers this ioctl cleans. We
895 * use kmalloc() for its buffer because memory used for the
896 * segment numbers is enough small.
897 */
898 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
899 nsegs * sizeof(__u64));
900 if (IS_ERR(kbufs[4])) {
901 ret = PTR_ERR(kbufs[4]);
902 goto out;
903 }
904 nilfs = inode->i_sb->s_fs_info;
905
906 for (n = 0; n < 4; n++) {
907 ret = -EINVAL;
908 if (argv[n].v_size != argsz[n])
909 goto out_free;
910
911 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
912 goto out_free;
913
914 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
915 goto out_free;
916
917 len = argv[n].v_size * argv[n].v_nmembs;
918 base = (void __user *)(unsigned long)argv[n].v_base;
919 if (len == 0) {
920 kbufs[n] = NULL;
921 continue;
922 }
923
924 kbufs[n] = vmalloc(len);
925 if (!kbufs[n]) {
926 ret = -ENOMEM;
927 goto out_free;
928 }
929 if (copy_from_user(kbufs[n], base, len)) {
930 ret = -EFAULT;
931 vfree(kbufs[n]);
932 goto out_free;
933 }
934 }
935
936 /*
937 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
938 * which will operates an inode list without blocking.
939 * To protect the list from concurrent operations,
940 * nilfs_ioctl_move_blocks should be atomic operation.
941 */
942 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
943 ret = -EBUSY;
944 goto out_free;
945 }
946
947 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
948 if (ret < 0) {
949 nilfs_err(inode->i_sb,
950 "error %d preparing GC: cannot read source blocks",
951 ret);
952 } else {
953 if (nilfs_sb_need_update(nilfs))
954 set_nilfs_discontinued(nilfs);
955 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
956 }
957
958 nilfs_remove_all_gcinodes(nilfs);
959 clear_nilfs_gc_running(nilfs);
960
961out_free:
962 while (--n >= 0)
963 vfree(kbufs[n]);
964 kfree(kbufs[4]);
965out:
966 mnt_drop_write_file(filp);
967 return ret;
968}
969
970/**
971 * nilfs_ioctl_sync - make a checkpoint
972 * @inode: inode object
973 * @filp: file object
974 * @cmd: ioctl's request code
975 * @argp: pointer on argument from userspace
976 *
977 * Description: nilfs_ioctl_sync() function constructs a logical segment
978 * for checkpointing. This function guarantees that all modified data
979 * and metadata are written out to the device when it successfully
980 * returned.
981 *
982 * Return Value: On success, 0 is retured. On errors, one of the following
983 * negative error code is returned.
984 *
985 * %-EROFS - Read only filesystem.
986 *
987 * %-EIO - I/O error
988 *
989 * %-ENOSPC - No space left on device (only in a panic state).
990 *
991 * %-ERESTARTSYS - Interrupted.
992 *
993 * %-ENOMEM - Insufficient memory available.
994 *
995 * %-EFAULT - Failure during execution of requested operation.
996 */
997static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
998 unsigned int cmd, void __user *argp)
999{
1000 __u64 cno;
1001 int ret;
1002 struct the_nilfs *nilfs;
1003
1004 ret = nilfs_construct_segment(inode->i_sb);
1005 if (ret < 0)
1006 return ret;
1007
1008 nilfs = inode->i_sb->s_fs_info;
1009 ret = nilfs_flush_device(nilfs);
1010 if (ret < 0)
1011 return ret;
1012
1013 if (argp != NULL) {
1014 down_read(&nilfs->ns_segctor_sem);
1015 cno = nilfs->ns_cno - 1;
1016 up_read(&nilfs->ns_segctor_sem);
1017 if (copy_to_user(argp, &cno, sizeof(cno)))
1018 return -EFAULT;
1019 }
1020 return 0;
1021}
1022
1023/**
1024 * nilfs_ioctl_resize - resize NILFS2 volume
1025 * @inode: inode object
1026 * @filp: file object
1027 * @argp: pointer on argument from userspace
1028 *
1029 * Return Value: On success, 0 is returned or error code, otherwise.
1030 */
1031static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1032 void __user *argp)
1033{
1034 __u64 newsize;
1035 int ret = -EPERM;
1036
1037 if (!capable(CAP_SYS_ADMIN))
1038 goto out;
1039
1040 ret = mnt_want_write_file(filp);
1041 if (ret)
1042 goto out;
1043
1044 ret = -EFAULT;
1045 if (copy_from_user(&newsize, argp, sizeof(newsize)))
1046 goto out_drop_write;
1047
1048 ret = nilfs_resize_fs(inode->i_sb, newsize);
1049
1050out_drop_write:
1051 mnt_drop_write_file(filp);
1052out:
1053 return ret;
1054}
1055
1056/**
1057 * nilfs_ioctl_trim_fs() - trim ioctl handle function
1058 * @inode: inode object
1059 * @argp: pointer on argument from userspace
1060 *
1061 * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1062 * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1063 * performs the actual trim operation.
1064 *
1065 * Return Value: On success, 0 is returned or negative error code, otherwise.
1066 */
1067static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1068{
1069 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1070 struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
1071 struct fstrim_range range;
1072 int ret;
1073
1074 if (!capable(CAP_SYS_ADMIN))
1075 return -EPERM;
1076
1077 if (!blk_queue_discard(q))
1078 return -EOPNOTSUPP;
1079
1080 if (copy_from_user(&range, argp, sizeof(range)))
1081 return -EFAULT;
1082
1083 range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
1084
1085 down_read(&nilfs->ns_segctor_sem);
1086 ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1087 up_read(&nilfs->ns_segctor_sem);
1088
1089 if (ret < 0)
1090 return ret;
1091
1092 if (copy_to_user(argp, &range, sizeof(range)))
1093 return -EFAULT;
1094
1095 return 0;
1096}
1097
1098/**
1099 * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1100 * @inode: inode object
1101 * @argp: pointer on argument from userspace
1102 *
1103 * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
1104 * of segments in bytes and upper limit of segments in bytes.
1105 * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1106 *
1107 * Return Value: On success, 0 is returned or error code, otherwise.
1108 */
1109static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1110{
1111 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1112 __u64 range[2];
1113 __u64 minseg, maxseg;
1114 unsigned long segbytes;
1115 int ret = -EPERM;
1116
1117 if (!capable(CAP_SYS_ADMIN))
1118 goto out;
1119
1120 ret = -EFAULT;
1121 if (copy_from_user(range, argp, sizeof(__u64[2])))
1122 goto out;
1123
1124 ret = -ERANGE;
1125 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
1126 goto out;
1127
1128 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1129
1130 minseg = range[0] + segbytes - 1;
1131 do_div(minseg, segbytes);
1132 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1133 do_div(maxseg, segbytes);
1134 maxseg--;
1135
1136 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1137out:
1138 return ret;
1139}
1140
1141/**
1142 * nilfs_ioctl_get_info - wrapping function of get metadata info
1143 * @inode: inode object
1144 * @filp: file object
1145 * @cmd: ioctl's request code
1146 * @argp: pointer on argument from userspace
1147 * @membsz: size of an item in bytes
1148 * @dofunc: concrete function of getting metadata info
1149 *
1150 * Description: nilfs_ioctl_get_info() gets metadata info by means of
1151 * calling dofunc() function.
1152 *
1153 * Return Value: On success, 0 is returned and requested metadata info
1154 * is copied into userspace. On error, one of the following
1155 * negative error codes is returned.
1156 *
1157 * %-EINVAL - Invalid arguments from userspace.
1158 *
1159 * %-ENOMEM - Insufficient amount of memory available.
1160 *
1161 * %-EFAULT - Failure during execution of requested operation.
1162 */
1163static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1164 unsigned int cmd, void __user *argp,
1165 size_t membsz,
1166 ssize_t (*dofunc)(struct the_nilfs *,
1167 __u64 *, int,
1168 void *, size_t, size_t))
1169
1170{
1171 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1172 struct nilfs_argv argv;
1173 int ret;
1174
1175 if (copy_from_user(&argv, argp, sizeof(argv)))
1176 return -EFAULT;
1177
1178 if (argv.v_size < membsz)
1179 return -EINVAL;
1180
1181 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1182 if (ret < 0)
1183 return ret;
1184
1185 if (copy_to_user(argp, &argv, sizeof(argv)))
1186 ret = -EFAULT;
1187 return ret;
1188}
1189
1190/**
1191 * nilfs_ioctl_set_suinfo - set segment usage info
1192 * @inode: inode object
1193 * @filp: file object
1194 * @cmd: ioctl's request code
1195 * @argp: pointer on argument from userspace
1196 *
1197 * Description: Expects an array of nilfs_suinfo_update structures
1198 * encapsulated in nilfs_argv and updates the segment usage info
1199 * according to the flags in nilfs_suinfo_update.
1200 *
1201 * Return Value: On success, 0 is returned. On error, one of the
1202 * following negative error codes is returned.
1203 *
1204 * %-EPERM - Not enough permissions
1205 *
1206 * %-EFAULT - Error copying input data
1207 *
1208 * %-EIO - I/O error.
1209 *
1210 * %-ENOMEM - Insufficient amount of memory available.
1211 *
1212 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1213 */
1214static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1215 unsigned int cmd, void __user *argp)
1216{
1217 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1218 struct nilfs_transaction_info ti;
1219 struct nilfs_argv argv;
1220 size_t len;
1221 void __user *base;
1222 void *kbuf;
1223 int ret;
1224
1225 if (!capable(CAP_SYS_ADMIN))
1226 return -EPERM;
1227
1228 ret = mnt_want_write_file(filp);
1229 if (ret)
1230 return ret;
1231
1232 ret = -EFAULT;
1233 if (copy_from_user(&argv, argp, sizeof(argv)))
1234 goto out;
1235
1236 ret = -EINVAL;
1237 if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1238 goto out;
1239
1240 if (argv.v_nmembs > nilfs->ns_nsegments)
1241 goto out;
1242
1243 if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1244 goto out;
1245
1246 len = argv.v_size * argv.v_nmembs;
1247 if (!len) {
1248 ret = 0;
1249 goto out;
1250 }
1251
1252 base = (void __user *)(unsigned long)argv.v_base;
1253 kbuf = vmalloc(len);
1254 if (!kbuf) {
1255 ret = -ENOMEM;
1256 goto out;
1257 }
1258
1259 if (copy_from_user(kbuf, base, len)) {
1260 ret = -EFAULT;
1261 goto out_free;
1262 }
1263
1264 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1265 ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1266 argv.v_nmembs);
1267 if (unlikely(ret < 0))
1268 nilfs_transaction_abort(inode->i_sb);
1269 else
1270 nilfs_transaction_commit(inode->i_sb); /* never fails */
1271
1272out_free:
1273 vfree(kbuf);
1274out:
1275 mnt_drop_write_file(filp);
1276 return ret;
1277}
1278
1279long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1280{
1281 struct inode *inode = file_inode(filp);
1282 void __user *argp = (void __user *)arg;
1283
1284 switch (cmd) {
1285 case FS_IOC_GETFLAGS:
1286 return nilfs_ioctl_getflags(inode, argp);
1287 case FS_IOC_SETFLAGS:
1288 return nilfs_ioctl_setflags(inode, filp, argp);
1289 case FS_IOC_GETVERSION:
1290 return nilfs_ioctl_getversion(inode, argp);
1291 case NILFS_IOCTL_CHANGE_CPMODE:
1292 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1293 case NILFS_IOCTL_DELETE_CHECKPOINT:
1294 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1295 case NILFS_IOCTL_GET_CPINFO:
1296 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1297 sizeof(struct nilfs_cpinfo),
1298 nilfs_ioctl_do_get_cpinfo);
1299 case NILFS_IOCTL_GET_CPSTAT:
1300 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1301 case NILFS_IOCTL_GET_SUINFO:
1302 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1303 sizeof(struct nilfs_suinfo),
1304 nilfs_ioctl_do_get_suinfo);
1305 case NILFS_IOCTL_SET_SUINFO:
1306 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
1307 case NILFS_IOCTL_GET_SUSTAT:
1308 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1309 case NILFS_IOCTL_GET_VINFO:
1310 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1311 sizeof(struct nilfs_vinfo),
1312 nilfs_ioctl_do_get_vinfo);
1313 case NILFS_IOCTL_GET_BDESCS:
1314 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1315 case NILFS_IOCTL_CLEAN_SEGMENTS:
1316 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
1317 case NILFS_IOCTL_SYNC:
1318 return nilfs_ioctl_sync(inode, filp, cmd, argp);
1319 case NILFS_IOCTL_RESIZE:
1320 return nilfs_ioctl_resize(inode, filp, argp);
1321 case NILFS_IOCTL_SET_ALLOC_RANGE:
1322 return nilfs_ioctl_set_alloc_range(inode, argp);
1323 case FITRIM:
1324 return nilfs_ioctl_trim_fs(inode, argp);
1325 default:
1326 return -ENOTTY;
1327 }
1328}
1329
1330#ifdef CONFIG_COMPAT
1331long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1332{
1333 switch (cmd) {
1334 case FS_IOC32_GETFLAGS:
1335 cmd = FS_IOC_GETFLAGS;
1336 break;
1337 case FS_IOC32_SETFLAGS:
1338 cmd = FS_IOC_SETFLAGS;
1339 break;
1340 case FS_IOC32_GETVERSION:
1341 cmd = FS_IOC_GETVERSION;
1342 break;
1343 case NILFS_IOCTL_CHANGE_CPMODE:
1344 case NILFS_IOCTL_DELETE_CHECKPOINT:
1345 case NILFS_IOCTL_GET_CPINFO:
1346 case NILFS_IOCTL_GET_CPSTAT:
1347 case NILFS_IOCTL_GET_SUINFO:
1348 case NILFS_IOCTL_SET_SUINFO:
1349 case NILFS_IOCTL_GET_SUSTAT:
1350 case NILFS_IOCTL_GET_VINFO:
1351 case NILFS_IOCTL_GET_BDESCS:
1352 case NILFS_IOCTL_CLEAN_SEGMENTS:
1353 case NILFS_IOCTL_SYNC:
1354 case NILFS_IOCTL_RESIZE:
1355 case NILFS_IOCTL_SET_ALLOC_RANGE:
1356 case FITRIM:
1357 break;
1358 default:
1359 return -ENOIOCTLCMD;
1360 }
1361 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1362}
1363#endif