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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/*
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/**
41 * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
42 * @nilfs: nilfs object
43 * @argv: vector of arguments from userspace
44 * @dir: set of direction flags
45 * @dofunc: concrete function of get/set metadata info
46 *
47 * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
48 * calling dofunc() function on the basis of @argv argument.
49 *
50 * Return Value: On success, 0 is returned and requested metadata info
51 * is copied into userspace. On error, one of the following
52 * negative error codes is returned.
53 *
54 * %-EINVAL - Invalid arguments from userspace.
55 *
56 * %-ENOMEM - Insufficient amount of memory available.
57 *
58 * %-EFAULT - Failure during execution of requested operation.
59 */
60static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
61 struct nilfs_argv *argv, int dir,
62 ssize_t (*dofunc)(struct the_nilfs *,
63 __u64 *, int,
64 void *, size_t, size_t))
65{
66 void *buf;
67 void __user *base = (void __user *)(unsigned long)argv->v_base;
68 size_t maxmembs, total, n;
69 ssize_t nr;
70 int ret, i;
71 __u64 pos, ppos;
72
73 if (argv->v_nmembs == 0)
74 return 0;
75
76 if (argv->v_size > PAGE_SIZE)
77 return -EINVAL;
78
79 /*
80 * Reject pairs of a start item position (argv->v_index) and a
81 * total count (argv->v_nmembs) which leads position 'pos' to
82 * overflow by the increment at the end of the loop.
83 */
84 if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
85 return -EINVAL;
86
87 buf = (void *)__get_free_pages(GFP_NOFS, 0);
88 if (unlikely(!buf))
89 return -ENOMEM;
90 maxmembs = PAGE_SIZE / argv->v_size;
91
92 ret = 0;
93 total = 0;
94 pos = argv->v_index;
95 for (i = 0; i < argv->v_nmembs; i += n) {
96 n = (argv->v_nmembs - i < maxmembs) ?
97 argv->v_nmembs - i : maxmembs;
98 if ((dir & _IOC_WRITE) &&
99 copy_from_user(buf, base + argv->v_size * i,
100 argv->v_size * n)) {
101 ret = -EFAULT;
102 break;
103 }
104 ppos = pos;
105 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
106 n);
107 if (nr < 0) {
108 ret = nr;
109 break;
110 }
111 if ((dir & _IOC_READ) &&
112 copy_to_user(base + argv->v_size * i, buf,
113 argv->v_size * nr)) {
114 ret = -EFAULT;
115 break;
116 }
117 total += nr;
118 if ((size_t)nr < n)
119 break;
120 if (pos == ppos)
121 pos += n;
122 }
123 argv->v_nmembs = total;
124
125 free_pages((unsigned long)buf, 0);
126 return ret;
127}
128
129/**
130 * nilfs_ioctl_getflags - ioctl to support lsattr
131 */
132static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
133{
134 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
135
136 return put_user(flags, (int __user *)argp);
137}
138
139/**
140 * nilfs_ioctl_setflags - ioctl to support chattr
141 */
142static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
143 void __user *argp)
144{
145 struct nilfs_transaction_info ti;
146 unsigned int flags, oldflags;
147 int ret;
148
149 if (!inode_owner_or_capable(inode))
150 return -EACCES;
151
152 if (get_user(flags, (int __user *)argp))
153 return -EFAULT;
154
155 ret = mnt_want_write_file(filp);
156 if (ret)
157 return ret;
158
159 flags = nilfs_mask_flags(inode->i_mode, flags);
160
161 inode_lock(inode);
162
163 oldflags = NILFS_I(inode)->i_flags;
164
165 /*
166 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
167 * relevant capability.
168 */
169 ret = -EPERM;
170 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
171 !capable(CAP_LINUX_IMMUTABLE))
172 goto out;
173
174 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
175 if (ret)
176 goto out;
177
178 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
179 (flags & FS_FL_USER_MODIFIABLE);
180
181 nilfs_set_inode_flags(inode);
182 inode->i_ctime = CURRENT_TIME;
183 if (IS_SYNC(inode))
184 nilfs_set_transaction_flag(NILFS_TI_SYNC);
185
186 nilfs_mark_inode_dirty(inode);
187 ret = nilfs_transaction_commit(inode->i_sb);
188out:
189 inode_unlock(inode);
190 mnt_drop_write_file(filp);
191 return ret;
192}
193
194/**
195 * nilfs_ioctl_getversion - get info about a file's version (generation number)
196 */
197static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
198{
199 return put_user(inode->i_generation, (int __user *)argp);
200}
201
202/**
203 * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
204 * @inode: inode object
205 * @filp: file object
206 * @cmd: ioctl's request code
207 * @argp: pointer on argument from userspace
208 *
209 * Description: nilfs_ioctl_change_cpmode() function changes mode of
210 * given checkpoint between checkpoint and snapshot state. This ioctl
211 * is used in chcp and mkcp utilities.
212 *
213 * Return Value: On success, 0 is returned and mode of a checkpoint is
214 * changed. On error, one of the following negative error codes
215 * is returned.
216 *
217 * %-EPERM - Operation not permitted.
218 *
219 * %-EFAULT - Failure during checkpoint mode changing.
220 */
221static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
222 unsigned int cmd, void __user *argp)
223{
224 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
225 struct nilfs_transaction_info ti;
226 struct nilfs_cpmode cpmode;
227 int ret;
228
229 if (!capable(CAP_SYS_ADMIN))
230 return -EPERM;
231
232 ret = mnt_want_write_file(filp);
233 if (ret)
234 return ret;
235
236 ret = -EFAULT;
237 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
238 goto out;
239
240 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
241
242 nilfs_transaction_begin(inode->i_sb, &ti, 0);
243 ret = nilfs_cpfile_change_cpmode(
244 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
245 if (unlikely(ret < 0))
246 nilfs_transaction_abort(inode->i_sb);
247 else
248 nilfs_transaction_commit(inode->i_sb); /* never fails */
249
250 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
251out:
252 mnt_drop_write_file(filp);
253 return ret;
254}
255
256/**
257 * nilfs_ioctl_delete_checkpoint - remove checkpoint
258 * @inode: inode object
259 * @filp: file object
260 * @cmd: ioctl's request code
261 * @argp: pointer on argument from userspace
262 *
263 * Description: nilfs_ioctl_delete_checkpoint() function removes
264 * checkpoint from NILFS2 file system. This ioctl is used in rmcp
265 * utility.
266 *
267 * Return Value: On success, 0 is returned and a checkpoint is
268 * removed. On error, one of the following negative error codes
269 * is returned.
270 *
271 * %-EPERM - Operation not permitted.
272 *
273 * %-EFAULT - Failure during checkpoint removing.
274 */
275static int
276nilfs_ioctl_delete_checkpoint(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_transaction_info ti;
281 __u64 cno;
282 int ret;
283
284 if (!capable(CAP_SYS_ADMIN))
285 return -EPERM;
286
287 ret = mnt_want_write_file(filp);
288 if (ret)
289 return ret;
290
291 ret = -EFAULT;
292 if (copy_from_user(&cno, argp, sizeof(cno)))
293 goto out;
294
295 nilfs_transaction_begin(inode->i_sb, &ti, 0);
296 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
297 if (unlikely(ret < 0))
298 nilfs_transaction_abort(inode->i_sb);
299 else
300 nilfs_transaction_commit(inode->i_sb); /* never fails */
301out:
302 mnt_drop_write_file(filp);
303 return ret;
304}
305
306/**
307 * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
308 * @nilfs: nilfs object
309 * @posp: pointer on array of checkpoint's numbers
310 * @flags: checkpoint mode (checkpoint or snapshot)
311 * @buf: buffer for storing checkponts' info
312 * @size: size in bytes of one checkpoint info item in array
313 * @nmembs: number of checkpoints in array (numbers and infos)
314 *
315 * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
316 * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
317 * lscp utility and by nilfs_cleanerd daemon.
318 *
319 * Return value: count of nilfs_cpinfo structures in output buffer.
320 */
321static ssize_t
322nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
323 void *buf, size_t size, size_t nmembs)
324{
325 int ret;
326
327 down_read(&nilfs->ns_segctor_sem);
328 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
329 size, nmembs);
330 up_read(&nilfs->ns_segctor_sem);
331 return ret;
332}
333
334/**
335 * nilfs_ioctl_get_cpstat - get checkpoints statistics
336 * @inode: inode object
337 * @filp: file object
338 * @cmd: ioctl's request code
339 * @argp: pointer on argument from userspace
340 *
341 * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
342 * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
343 * and by nilfs_cleanerd daemon.
344 *
345 * Return Value: On success, 0 is returned, and checkpoints information is
346 * copied into userspace pointer @argp. On error, one of the following
347 * negative error codes is returned.
348 *
349 * %-EIO - I/O error.
350 *
351 * %-ENOMEM - Insufficient amount of memory available.
352 *
353 * %-EFAULT - Failure during getting checkpoints statistics.
354 */
355static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
356 unsigned int cmd, void __user *argp)
357{
358 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
359 struct nilfs_cpstat cpstat;
360 int ret;
361
362 down_read(&nilfs->ns_segctor_sem);
363 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
364 up_read(&nilfs->ns_segctor_sem);
365 if (ret < 0)
366 return ret;
367
368 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
369 ret = -EFAULT;
370 return ret;
371}
372
373/**
374 * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
375 * @nilfs: nilfs object
376 * @posp: pointer on array of segment numbers
377 * @flags: *not used*
378 * @buf: buffer for storing suinfo array
379 * @size: size in bytes of one suinfo item in array
380 * @nmembs: count of segment numbers and suinfos in array
381 *
382 * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
383 * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
384 * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
385 *
386 * Return value: count of nilfs_suinfo structures in output buffer.
387 */
388static ssize_t
389nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
390 void *buf, size_t size, size_t nmembs)
391{
392 int ret;
393
394 down_read(&nilfs->ns_segctor_sem);
395 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
396 nmembs);
397 up_read(&nilfs->ns_segctor_sem);
398 return ret;
399}
400
401/**
402 * nilfs_ioctl_get_sustat - get segment usage statistics
403 * @inode: inode object
404 * @filp: file object
405 * @cmd: ioctl's request code
406 * @argp: pointer on argument from userspace
407 *
408 * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
409 * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
410 * and by nilfs_cleanerd daemon.
411 *
412 * Return Value: On success, 0 is returned, and segment usage information is
413 * copied into userspace pointer @argp. On error, one of the following
414 * negative error codes is returned.
415 *
416 * %-EIO - I/O error.
417 *
418 * %-ENOMEM - Insufficient amount of memory available.
419 *
420 * %-EFAULT - Failure during getting segment usage statistics.
421 */
422static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
423 unsigned int cmd, void __user *argp)
424{
425 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
426 struct nilfs_sustat sustat;
427 int ret;
428
429 down_read(&nilfs->ns_segctor_sem);
430 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
431 up_read(&nilfs->ns_segctor_sem);
432 if (ret < 0)
433 return ret;
434
435 if (copy_to_user(argp, &sustat, sizeof(sustat)))
436 ret = -EFAULT;
437 return ret;
438}
439
440/**
441 * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
442 * @nilfs: nilfs object
443 * @posp: *not used*
444 * @flags: *not used*
445 * @buf: buffer for storing array of nilfs_vinfo structures
446 * @size: size in bytes of one vinfo item in array
447 * @nmembs: count of vinfos in array
448 *
449 * Description: nilfs_ioctl_do_get_vinfo() function returns information
450 * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
451 * by nilfs_cleanerd daemon.
452 *
453 * Return value: count of nilfs_vinfo structures in output buffer.
454 */
455static ssize_t
456nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
457 void *buf, size_t size, size_t nmembs)
458{
459 int ret;
460
461 down_read(&nilfs->ns_segctor_sem);
462 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
463 up_read(&nilfs->ns_segctor_sem);
464 return ret;
465}
466
467/**
468 * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
469 * @nilfs: nilfs object
470 * @posp: *not used*
471 * @flags: *not used*
472 * @buf: buffer for storing array of nilfs_bdesc structures
473 * @size: size in bytes of one bdesc item in array
474 * @nmembs: count of bdescs in array
475 *
476 * Description: nilfs_ioctl_do_get_bdescs() function returns information
477 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
478 * is used by nilfs_cleanerd daemon.
479 *
480 * Return value: count of nilfs_bdescs structures in output buffer.
481 */
482static ssize_t
483nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
484 void *buf, size_t size, size_t nmembs)
485{
486 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
487 struct nilfs_bdesc *bdescs = buf;
488 int ret, i;
489
490 down_read(&nilfs->ns_segctor_sem);
491 for (i = 0; i < nmembs; i++) {
492 ret = nilfs_bmap_lookup_at_level(bmap,
493 bdescs[i].bd_offset,
494 bdescs[i].bd_level + 1,
495 &bdescs[i].bd_blocknr);
496 if (ret < 0) {
497 if (ret != -ENOENT) {
498 up_read(&nilfs->ns_segctor_sem);
499 return ret;
500 }
501 bdescs[i].bd_blocknr = 0;
502 }
503 }
504 up_read(&nilfs->ns_segctor_sem);
505 return nmembs;
506}
507
508/**
509 * nilfs_ioctl_get_bdescs - get disk block descriptors
510 * @inode: inode object
511 * @filp: file object
512 * @cmd: ioctl's request code
513 * @argp: pointer on argument from userspace
514 *
515 * Description: nilfs_ioctl_do_get_bdescs() function returns information
516 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
517 * is used by nilfs_cleanerd daemon.
518 *
519 * Return Value: On success, 0 is returned, and disk block descriptors are
520 * copied into userspace pointer @argp. On error, one of the following
521 * negative error codes is returned.
522 *
523 * %-EINVAL - Invalid arguments from userspace.
524 *
525 * %-EIO - I/O error.
526 *
527 * %-ENOMEM - Insufficient amount of memory available.
528 *
529 * %-EFAULT - Failure during getting disk block descriptors.
530 */
531static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
532 unsigned int cmd, void __user *argp)
533{
534 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
535 struct nilfs_argv argv;
536 int ret;
537
538 if (copy_from_user(&argv, argp, sizeof(argv)))
539 return -EFAULT;
540
541 if (argv.v_size != sizeof(struct nilfs_bdesc))
542 return -EINVAL;
543
544 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
545 nilfs_ioctl_do_get_bdescs);
546 if (ret < 0)
547 return ret;
548
549 if (copy_to_user(argp, &argv, sizeof(argv)))
550 ret = -EFAULT;
551 return ret;
552}
553
554/**
555 * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
556 * @inode: inode object
557 * @vdesc: descriptor of virtual block number
558 * @buffers: list of moving buffers
559 *
560 * Description: nilfs_ioctl_move_inode_block() function registers data/node
561 * buffer in the GC pagecache and submit read request.
562 *
563 * Return Value: On success, 0 is returned. On error, one of the following
564 * negative error codes is returned.
565 *
566 * %-EIO - I/O error.
567 *
568 * %-ENOMEM - Insufficient amount of memory available.
569 *
570 * %-ENOENT - Requested block doesn't exist.
571 *
572 * %-EEXIST - Blocks conflict is detected.
573 */
574static int nilfs_ioctl_move_inode_block(struct inode *inode,
575 struct nilfs_vdesc *vdesc,
576 struct list_head *buffers)
577{
578 struct buffer_head *bh;
579 int ret;
580
581 if (vdesc->vd_flags == 0)
582 ret = nilfs_gccache_submit_read_data(
583 inode, vdesc->vd_offset, vdesc->vd_blocknr,
584 vdesc->vd_vblocknr, &bh);
585 else
586 ret = nilfs_gccache_submit_read_node(
587 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
588
589 if (unlikely(ret < 0)) {
590 if (ret == -ENOENT)
591 printk(KERN_CRIT
592 "%s: invalid virtual block address (%s): "
593 "ino=%llu, cno=%llu, offset=%llu, "
594 "blocknr=%llu, vblocknr=%llu\n",
595 __func__, vdesc->vd_flags ? "node" : "data",
596 (unsigned long long)vdesc->vd_ino,
597 (unsigned long long)vdesc->vd_cno,
598 (unsigned long long)vdesc->vd_offset,
599 (unsigned long long)vdesc->vd_blocknr,
600 (unsigned long long)vdesc->vd_vblocknr);
601 return ret;
602 }
603 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
604 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
605 "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
606 __func__, vdesc->vd_flags ? "node" : "data",
607 (unsigned long long)vdesc->vd_ino,
608 (unsigned long long)vdesc->vd_cno,
609 (unsigned long long)vdesc->vd_offset,
610 (unsigned long long)vdesc->vd_blocknr,
611 (unsigned long long)vdesc->vd_vblocknr);
612 brelse(bh);
613 return -EEXIST;
614 }
615 list_add_tail(&bh->b_assoc_buffers, buffers);
616 return 0;
617}
618
619/**
620 * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
621 * @sb: superblock object
622 * @argv: vector of arguments from userspace
623 * @buf: array of nilfs_vdesc structures
624 *
625 * Description: nilfs_ioctl_move_blocks() function reads valid data/node
626 * blocks that garbage collector specified with the array of nilfs_vdesc
627 * structures and stores them into page caches of GC inodes.
628 *
629 * Return Value: Number of processed nilfs_vdesc structures or
630 * error code, otherwise.
631 */
632static int nilfs_ioctl_move_blocks(struct super_block *sb,
633 struct nilfs_argv *argv, void *buf)
634{
635 size_t nmembs = argv->v_nmembs;
636 struct the_nilfs *nilfs = sb->s_fs_info;
637 struct inode *inode;
638 struct nilfs_vdesc *vdesc;
639 struct buffer_head *bh, *n;
640 LIST_HEAD(buffers);
641 ino_t ino;
642 __u64 cno;
643 int i, ret;
644
645 for (i = 0, vdesc = buf; i < nmembs; ) {
646 ino = vdesc->vd_ino;
647 cno = vdesc->vd_cno;
648 inode = nilfs_iget_for_gc(sb, ino, cno);
649 if (IS_ERR(inode)) {
650 ret = PTR_ERR(inode);
651 goto failed;
652 }
653 if (list_empty(&NILFS_I(inode)->i_dirty)) {
654 /*
655 * Add the inode to GC inode list. Garbage Collection
656 * is serialized and no two processes manipulate the
657 * list simultaneously.
658 */
659 igrab(inode);
660 list_add(&NILFS_I(inode)->i_dirty,
661 &nilfs->ns_gc_inodes);
662 }
663
664 do {
665 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
666 &buffers);
667 if (unlikely(ret < 0)) {
668 iput(inode);
669 goto failed;
670 }
671 vdesc++;
672 } while (++i < nmembs &&
673 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
674
675 iput(inode); /* The inode still remains in GC inode list */
676 }
677
678 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
679 ret = nilfs_gccache_wait_and_mark_dirty(bh);
680 if (unlikely(ret < 0)) {
681 WARN_ON(ret == -EEXIST);
682 goto failed;
683 }
684 list_del_init(&bh->b_assoc_buffers);
685 brelse(bh);
686 }
687 return nmembs;
688
689 failed:
690 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
691 list_del_init(&bh->b_assoc_buffers);
692 brelse(bh);
693 }
694 return ret;
695}
696
697/**
698 * nilfs_ioctl_delete_checkpoints - delete checkpoints
699 * @nilfs: nilfs object
700 * @argv: vector of arguments from userspace
701 * @buf: array of periods of checkpoints numbers
702 *
703 * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
704 * in the period from p_start to p_end, excluding p_end itself. The checkpoints
705 * which have been already deleted are ignored.
706 *
707 * Return Value: Number of processed nilfs_period structures or
708 * error code, otherwise.
709 *
710 * %-EIO - I/O error.
711 *
712 * %-ENOMEM - Insufficient amount of memory available.
713 *
714 * %-EINVAL - invalid checkpoints.
715 */
716static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
717 struct nilfs_argv *argv, void *buf)
718{
719 size_t nmembs = argv->v_nmembs;
720 struct inode *cpfile = nilfs->ns_cpfile;
721 struct nilfs_period *periods = buf;
722 int ret, i;
723
724 for (i = 0; i < nmembs; i++) {
725 ret = nilfs_cpfile_delete_checkpoints(
726 cpfile, periods[i].p_start, periods[i].p_end);
727 if (ret < 0)
728 return ret;
729 }
730 return nmembs;
731}
732
733/**
734 * nilfs_ioctl_free_vblocknrs - free virtual block numbers
735 * @nilfs: nilfs object
736 * @argv: vector of arguments from userspace
737 * @buf: array of virtual block numbers
738 *
739 * Description: nilfs_ioctl_free_vblocknrs() function frees
740 * the virtual block numbers specified by @buf and @argv->v_nmembs.
741 *
742 * Return Value: Number of processed virtual block numbers or
743 * error code, otherwise.
744 *
745 * %-EIO - I/O error.
746 *
747 * %-ENOMEM - Insufficient amount of memory available.
748 *
749 * %-ENOENT - The virtual block number have not been allocated.
750 */
751static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
752 struct nilfs_argv *argv, void *buf)
753{
754 size_t nmembs = argv->v_nmembs;
755 int ret;
756
757 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
758
759 return (ret < 0) ? ret : nmembs;
760}
761
762/**
763 * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
764 * @nilfs: nilfs object
765 * @argv: vector of arguments from userspace
766 * @buf: array of block descriptors
767 *
768 * Description: nilfs_ioctl_mark_blocks_dirty() function marks
769 * metadata file or data blocks as dirty.
770 *
771 * Return Value: Number of processed block descriptors or
772 * error code, otherwise.
773 *
774 * %-ENOMEM - Insufficient memory available.
775 *
776 * %-EIO - I/O error
777 *
778 * %-ENOENT - the specified block does not exist (hole block)
779 */
780static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
781 struct nilfs_argv *argv, void *buf)
782{
783 size_t nmembs = argv->v_nmembs;
784 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
785 struct nilfs_bdesc *bdescs = buf;
786 int ret, i;
787
788 for (i = 0; i < nmembs; i++) {
789 /* XXX: use macro or inline func to check liveness */
790 ret = nilfs_bmap_lookup_at_level(bmap,
791 bdescs[i].bd_offset,
792 bdescs[i].bd_level + 1,
793 &bdescs[i].bd_blocknr);
794 if (ret < 0) {
795 if (ret != -ENOENT)
796 return ret;
797 bdescs[i].bd_blocknr = 0;
798 }
799 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
800 /* skip dead block */
801 continue;
802 if (bdescs[i].bd_level == 0) {
803 ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
804 bdescs[i].bd_offset);
805 if (ret < 0) {
806 WARN_ON(ret == -ENOENT);
807 return ret;
808 }
809 } else {
810 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
811 bdescs[i].bd_level);
812 if (ret < 0) {
813 WARN_ON(ret == -ENOENT);
814 return ret;
815 }
816 }
817 }
818 return nmembs;
819}
820
821int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
822 struct nilfs_argv *argv, void **kbufs)
823{
824 const char *msg;
825 int ret;
826
827 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
828 if (ret < 0) {
829 /*
830 * can safely abort because checkpoints can be removed
831 * independently.
832 */
833 msg = "cannot delete checkpoints";
834 goto failed;
835 }
836 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
837 if (ret < 0) {
838 /*
839 * can safely abort because DAT file is updated atomically
840 * using a copy-on-write technique.
841 */
842 msg = "cannot delete virtual blocks from DAT file";
843 goto failed;
844 }
845 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
846 if (ret < 0) {
847 /*
848 * can safely abort because the operation is nondestructive.
849 */
850 msg = "cannot mark copying blocks dirty";
851 goto failed;
852 }
853 return 0;
854
855 failed:
856 printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
857 msg, ret);
858 return ret;
859}
860
861/**
862 * nilfs_ioctl_clean_segments - clean segments
863 * @inode: inode object
864 * @filp: file object
865 * @cmd: ioctl's request code
866 * @argp: pointer on argument from userspace
867 *
868 * Description: nilfs_ioctl_clean_segments() function makes garbage
869 * collection operation in the environment of requested parameters
870 * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
871 * nilfs_cleanerd daemon.
872 *
873 * Return Value: On success, 0 is returned or error code, otherwise.
874 */
875static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
876 unsigned int cmd, void __user *argp)
877{
878 struct nilfs_argv argv[5];
879 static const size_t argsz[5] = {
880 sizeof(struct nilfs_vdesc),
881 sizeof(struct nilfs_period),
882 sizeof(__u64),
883 sizeof(struct nilfs_bdesc),
884 sizeof(__u64),
885 };
886 void __user *base;
887 void *kbufs[5];
888 struct the_nilfs *nilfs;
889 size_t len, nsegs;
890 int n, ret;
891
892 if (!capable(CAP_SYS_ADMIN))
893 return -EPERM;
894
895 ret = mnt_want_write_file(filp);
896 if (ret)
897 return ret;
898
899 ret = -EFAULT;
900 if (copy_from_user(argv, argp, sizeof(argv)))
901 goto out;
902
903 ret = -EINVAL;
904 nsegs = argv[4].v_nmembs;
905 if (argv[4].v_size != argsz[4])
906 goto out;
907 if (nsegs > UINT_MAX / sizeof(__u64))
908 goto out;
909
910 /*
911 * argv[4] points to segment numbers this ioctl cleans. We
912 * use kmalloc() for its buffer because memory used for the
913 * segment numbers is enough small.
914 */
915 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
916 nsegs * sizeof(__u64));
917 if (IS_ERR(kbufs[4])) {
918 ret = PTR_ERR(kbufs[4]);
919 goto out;
920 }
921 nilfs = inode->i_sb->s_fs_info;
922
923 for (n = 0; n < 4; n++) {
924 ret = -EINVAL;
925 if (argv[n].v_size != argsz[n])
926 goto out_free;
927
928 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
929 goto out_free;
930
931 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
932 goto out_free;
933
934 len = argv[n].v_size * argv[n].v_nmembs;
935 base = (void __user *)(unsigned long)argv[n].v_base;
936 if (len == 0) {
937 kbufs[n] = NULL;
938 continue;
939 }
940
941 kbufs[n] = vmalloc(len);
942 if (!kbufs[n]) {
943 ret = -ENOMEM;
944 goto out_free;
945 }
946 if (copy_from_user(kbufs[n], base, len)) {
947 ret = -EFAULT;
948 vfree(kbufs[n]);
949 goto out_free;
950 }
951 }
952
953 /*
954 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
955 * which will operates an inode list without blocking.
956 * To protect the list from concurrent operations,
957 * nilfs_ioctl_move_blocks should be atomic operation.
958 */
959 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
960 ret = -EBUSY;
961 goto out_free;
962 }
963
964 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
965 if (ret < 0)
966 printk(KERN_ERR "NILFS: GC failed during preparation: "
967 "cannot read source blocks: err=%d\n", ret);
968 else {
969 if (nilfs_sb_need_update(nilfs))
970 set_nilfs_discontinued(nilfs);
971 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
972 }
973
974 nilfs_remove_all_gcinodes(nilfs);
975 clear_nilfs_gc_running(nilfs);
976
977out_free:
978 while (--n >= 0)
979 vfree(kbufs[n]);
980 kfree(kbufs[4]);
981out:
982 mnt_drop_write_file(filp);
983 return ret;
984}
985
986/**
987 * nilfs_ioctl_sync - make a checkpoint
988 * @inode: inode object
989 * @filp: file object
990 * @cmd: ioctl's request code
991 * @argp: pointer on argument from userspace
992 *
993 * Description: nilfs_ioctl_sync() function constructs a logical segment
994 * for checkpointing. This function guarantees that all modified data
995 * and metadata are written out to the device when it successfully
996 * returned.
997 *
998 * Return Value: On success, 0 is retured. On errors, one of the following
999 * negative error code is returned.
1000 *
1001 * %-EROFS - Read only filesystem.
1002 *
1003 * %-EIO - I/O error
1004 *
1005 * %-ENOSPC - No space left on device (only in a panic state).
1006 *
1007 * %-ERESTARTSYS - Interrupted.
1008 *
1009 * %-ENOMEM - Insufficient memory available.
1010 *
1011 * %-EFAULT - Failure during execution of requested operation.
1012 */
1013static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
1014 unsigned int cmd, void __user *argp)
1015{
1016 __u64 cno;
1017 int ret;
1018 struct the_nilfs *nilfs;
1019
1020 ret = nilfs_construct_segment(inode->i_sb);
1021 if (ret < 0)
1022 return ret;
1023
1024 nilfs = inode->i_sb->s_fs_info;
1025 ret = nilfs_flush_device(nilfs);
1026 if (ret < 0)
1027 return ret;
1028
1029 if (argp != NULL) {
1030 down_read(&nilfs->ns_segctor_sem);
1031 cno = nilfs->ns_cno - 1;
1032 up_read(&nilfs->ns_segctor_sem);
1033 if (copy_to_user(argp, &cno, sizeof(cno)))
1034 return -EFAULT;
1035 }
1036 return 0;
1037}
1038
1039/**
1040 * nilfs_ioctl_resize - resize NILFS2 volume
1041 * @inode: inode object
1042 * @filp: file object
1043 * @argp: pointer on argument from userspace
1044 *
1045 * Return Value: On success, 0 is returned or error code, otherwise.
1046 */
1047static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1048 void __user *argp)
1049{
1050 __u64 newsize;
1051 int ret = -EPERM;
1052
1053 if (!capable(CAP_SYS_ADMIN))
1054 goto out;
1055
1056 ret = mnt_want_write_file(filp);
1057 if (ret)
1058 goto out;
1059
1060 ret = -EFAULT;
1061 if (copy_from_user(&newsize, argp, sizeof(newsize)))
1062 goto out_drop_write;
1063
1064 ret = nilfs_resize_fs(inode->i_sb, newsize);
1065
1066out_drop_write:
1067 mnt_drop_write_file(filp);
1068out:
1069 return ret;
1070}
1071
1072/**
1073 * nilfs_ioctl_trim_fs() - trim ioctl handle function
1074 * @inode: inode object
1075 * @argp: pointer on argument from userspace
1076 *
1077 * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1078 * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1079 * performs the actual trim operation.
1080 *
1081 * Return Value: On success, 0 is returned or negative error code, otherwise.
1082 */
1083static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1084{
1085 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1086 struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
1087 struct fstrim_range range;
1088 int ret;
1089
1090 if (!capable(CAP_SYS_ADMIN))
1091 return -EPERM;
1092
1093 if (!blk_queue_discard(q))
1094 return -EOPNOTSUPP;
1095
1096 if (copy_from_user(&range, argp, sizeof(range)))
1097 return -EFAULT;
1098
1099 range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
1100
1101 down_read(&nilfs->ns_segctor_sem);
1102 ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1103 up_read(&nilfs->ns_segctor_sem);
1104
1105 if (ret < 0)
1106 return ret;
1107
1108 if (copy_to_user(argp, &range, sizeof(range)))
1109 return -EFAULT;
1110
1111 return 0;
1112}
1113
1114/**
1115 * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1116 * @inode: inode object
1117 * @argp: pointer on argument from userspace
1118 *
1119 * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
1120 * of segments in bytes and upper limit of segments in bytes.
1121 * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1122 *
1123 * Return Value: On success, 0 is returned or error code, otherwise.
1124 */
1125static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1126{
1127 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1128 __u64 range[2];
1129 __u64 minseg, maxseg;
1130 unsigned long segbytes;
1131 int ret = -EPERM;
1132
1133 if (!capable(CAP_SYS_ADMIN))
1134 goto out;
1135
1136 ret = -EFAULT;
1137 if (copy_from_user(range, argp, sizeof(__u64[2])))
1138 goto out;
1139
1140 ret = -ERANGE;
1141 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
1142 goto out;
1143
1144 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1145
1146 minseg = range[0] + segbytes - 1;
1147 do_div(minseg, segbytes);
1148 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1149 do_div(maxseg, segbytes);
1150 maxseg--;
1151
1152 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1153out:
1154 return ret;
1155}
1156
1157/**
1158 * nilfs_ioctl_get_info - wrapping function of get metadata info
1159 * @inode: inode object
1160 * @filp: file object
1161 * @cmd: ioctl's request code
1162 * @argp: pointer on argument from userspace
1163 * @membsz: size of an item in bytes
1164 * @dofunc: concrete function of getting metadata info
1165 *
1166 * Description: nilfs_ioctl_get_info() gets metadata info by means of
1167 * calling dofunc() function.
1168 *
1169 * Return Value: On success, 0 is returned and requested metadata info
1170 * is copied into userspace. On error, one of the following
1171 * negative error codes is returned.
1172 *
1173 * %-EINVAL - Invalid arguments from userspace.
1174 *
1175 * %-ENOMEM - Insufficient amount of memory available.
1176 *
1177 * %-EFAULT - Failure during execution of requested operation.
1178 */
1179static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1180 unsigned int cmd, void __user *argp,
1181 size_t membsz,
1182 ssize_t (*dofunc)(struct the_nilfs *,
1183 __u64 *, int,
1184 void *, size_t, size_t))
1185
1186{
1187 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1188 struct nilfs_argv argv;
1189 int ret;
1190
1191 if (copy_from_user(&argv, argp, sizeof(argv)))
1192 return -EFAULT;
1193
1194 if (argv.v_size < membsz)
1195 return -EINVAL;
1196
1197 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1198 if (ret < 0)
1199 return ret;
1200
1201 if (copy_to_user(argp, &argv, sizeof(argv)))
1202 ret = -EFAULT;
1203 return ret;
1204}
1205
1206/**
1207 * nilfs_ioctl_set_suinfo - set segment usage info
1208 * @inode: inode object
1209 * @filp: file object
1210 * @cmd: ioctl's request code
1211 * @argp: pointer on argument from userspace
1212 *
1213 * Description: Expects an array of nilfs_suinfo_update structures
1214 * encapsulated in nilfs_argv and updates the segment usage info
1215 * according to the flags in nilfs_suinfo_update.
1216 *
1217 * Return Value: On success, 0 is returned. On error, one of the
1218 * following negative error codes is returned.
1219 *
1220 * %-EPERM - Not enough permissions
1221 *
1222 * %-EFAULT - Error copying input data
1223 *
1224 * %-EIO - I/O error.
1225 *
1226 * %-ENOMEM - Insufficient amount of memory available.
1227 *
1228 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1229 */
1230static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1231 unsigned int cmd, void __user *argp)
1232{
1233 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1234 struct nilfs_transaction_info ti;
1235 struct nilfs_argv argv;
1236 size_t len;
1237 void __user *base;
1238 void *kbuf;
1239 int ret;
1240
1241 if (!capable(CAP_SYS_ADMIN))
1242 return -EPERM;
1243
1244 ret = mnt_want_write_file(filp);
1245 if (ret)
1246 return ret;
1247
1248 ret = -EFAULT;
1249 if (copy_from_user(&argv, argp, sizeof(argv)))
1250 goto out;
1251
1252 ret = -EINVAL;
1253 if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1254 goto out;
1255
1256 if (argv.v_nmembs > nilfs->ns_nsegments)
1257 goto out;
1258
1259 if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1260 goto out;
1261
1262 len = argv.v_size * argv.v_nmembs;
1263 if (!len) {
1264 ret = 0;
1265 goto out;
1266 }
1267
1268 base = (void __user *)(unsigned long)argv.v_base;
1269 kbuf = vmalloc(len);
1270 if (!kbuf) {
1271 ret = -ENOMEM;
1272 goto out;
1273 }
1274
1275 if (copy_from_user(kbuf, base, len)) {
1276 ret = -EFAULT;
1277 goto out_free;
1278 }
1279
1280 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1281 ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1282 argv.v_nmembs);
1283 if (unlikely(ret < 0))
1284 nilfs_transaction_abort(inode->i_sb);
1285 else
1286 nilfs_transaction_commit(inode->i_sb); /* never fails */
1287
1288out_free:
1289 vfree(kbuf);
1290out:
1291 mnt_drop_write_file(filp);
1292 return ret;
1293}
1294
1295long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1296{
1297 struct inode *inode = file_inode(filp);
1298 void __user *argp = (void __user *)arg;
1299
1300 switch (cmd) {
1301 case FS_IOC_GETFLAGS:
1302 return nilfs_ioctl_getflags(inode, argp);
1303 case FS_IOC_SETFLAGS:
1304 return nilfs_ioctl_setflags(inode, filp, argp);
1305 case FS_IOC_GETVERSION:
1306 return nilfs_ioctl_getversion(inode, argp);
1307 case NILFS_IOCTL_CHANGE_CPMODE:
1308 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1309 case NILFS_IOCTL_DELETE_CHECKPOINT:
1310 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1311 case NILFS_IOCTL_GET_CPINFO:
1312 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1313 sizeof(struct nilfs_cpinfo),
1314 nilfs_ioctl_do_get_cpinfo);
1315 case NILFS_IOCTL_GET_CPSTAT:
1316 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1317 case NILFS_IOCTL_GET_SUINFO:
1318 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1319 sizeof(struct nilfs_suinfo),
1320 nilfs_ioctl_do_get_suinfo);
1321 case NILFS_IOCTL_SET_SUINFO:
1322 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
1323 case NILFS_IOCTL_GET_SUSTAT:
1324 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1325 case NILFS_IOCTL_GET_VINFO:
1326 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1327 sizeof(struct nilfs_vinfo),
1328 nilfs_ioctl_do_get_vinfo);
1329 case NILFS_IOCTL_GET_BDESCS:
1330 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1331 case NILFS_IOCTL_CLEAN_SEGMENTS:
1332 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
1333 case NILFS_IOCTL_SYNC:
1334 return nilfs_ioctl_sync(inode, filp, cmd, argp);
1335 case NILFS_IOCTL_RESIZE:
1336 return nilfs_ioctl_resize(inode, filp, argp);
1337 case NILFS_IOCTL_SET_ALLOC_RANGE:
1338 return nilfs_ioctl_set_alloc_range(inode, argp);
1339 case FITRIM:
1340 return nilfs_ioctl_trim_fs(inode, argp);
1341 default:
1342 return -ENOTTY;
1343 }
1344}
1345
1346#ifdef CONFIG_COMPAT
1347long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1348{
1349 switch (cmd) {
1350 case FS_IOC32_GETFLAGS:
1351 cmd = FS_IOC_GETFLAGS;
1352 break;
1353 case FS_IOC32_SETFLAGS:
1354 cmd = FS_IOC_SETFLAGS;
1355 break;
1356 case FS_IOC32_GETVERSION:
1357 cmd = FS_IOC_GETVERSION;
1358 break;
1359 case NILFS_IOCTL_CHANGE_CPMODE:
1360 case NILFS_IOCTL_DELETE_CHECKPOINT:
1361 case NILFS_IOCTL_GET_CPINFO:
1362 case NILFS_IOCTL_GET_CPSTAT:
1363 case NILFS_IOCTL_GET_SUINFO:
1364 case NILFS_IOCTL_SET_SUINFO:
1365 case NILFS_IOCTL_GET_SUSTAT:
1366 case NILFS_IOCTL_GET_VINFO:
1367 case NILFS_IOCTL_GET_BDESCS:
1368 case NILFS_IOCTL_CLEAN_SEGMENTS:
1369 case NILFS_IOCTL_SYNC:
1370 case NILFS_IOCTL_RESIZE:
1371 case NILFS_IOCTL_SET_ALLOC_RANGE:
1372 break;
1373 default:
1374 return -ENOIOCTLCMD;
1375 }
1376 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1377}
1378#endif