Loading...
1/*
2 * ioctl.c - NILFS ioctl operations.
3 *
4 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>.
21 */
22
23#include <linux/fs.h>
24#include <linux/wait.h>
25#include <linux/slab.h>
26#include <linux/capability.h> /* capable() */
27#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
28#include <linux/vmalloc.h>
29#include <linux/compat.h> /* compat_ptr() */
30#include <linux/mount.h> /* mnt_want_write(), mnt_drop_write() */
31#include <linux/buffer_head.h>
32#include <linux/nilfs2_fs.h>
33#include "nilfs.h"
34#include "segment.h"
35#include "bmap.h"
36#include "cpfile.h"
37#include "sufile.h"
38#include "dat.h"
39
40
41static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
42 struct nilfs_argv *argv, int dir,
43 ssize_t (*dofunc)(struct the_nilfs *,
44 __u64 *, int,
45 void *, size_t, size_t))
46{
47 void *buf;
48 void __user *base = (void __user *)(unsigned long)argv->v_base;
49 size_t maxmembs, total, n;
50 ssize_t nr;
51 int ret, i;
52 __u64 pos, ppos;
53
54 if (argv->v_nmembs == 0)
55 return 0;
56
57 if (argv->v_size > PAGE_SIZE)
58 return -EINVAL;
59
60 buf = (void *)__get_free_pages(GFP_NOFS, 0);
61 if (unlikely(!buf))
62 return -ENOMEM;
63 maxmembs = PAGE_SIZE / argv->v_size;
64
65 ret = 0;
66 total = 0;
67 pos = argv->v_index;
68 for (i = 0; i < argv->v_nmembs; i += n) {
69 n = (argv->v_nmembs - i < maxmembs) ?
70 argv->v_nmembs - i : maxmembs;
71 if ((dir & _IOC_WRITE) &&
72 copy_from_user(buf, base + argv->v_size * i,
73 argv->v_size * n)) {
74 ret = -EFAULT;
75 break;
76 }
77 ppos = pos;
78 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
79 n);
80 if (nr < 0) {
81 ret = nr;
82 break;
83 }
84 if ((dir & _IOC_READ) &&
85 copy_to_user(base + argv->v_size * i, buf,
86 argv->v_size * nr)) {
87 ret = -EFAULT;
88 break;
89 }
90 total += nr;
91 if ((size_t)nr < n)
92 break;
93 if (pos == ppos)
94 pos += n;
95 }
96 argv->v_nmembs = total;
97
98 free_pages((unsigned long)buf, 0);
99 return ret;
100}
101
102static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
103{
104 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
105
106 return put_user(flags, (int __user *)argp);
107}
108
109static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
110 void __user *argp)
111{
112 struct nilfs_transaction_info ti;
113 unsigned int flags, oldflags;
114 int ret;
115
116 if (!inode_owner_or_capable(inode))
117 return -EACCES;
118
119 if (get_user(flags, (int __user *)argp))
120 return -EFAULT;
121
122 ret = mnt_want_write(filp->f_path.mnt);
123 if (ret)
124 return ret;
125
126 flags = nilfs_mask_flags(inode->i_mode, flags);
127
128 mutex_lock(&inode->i_mutex);
129
130 oldflags = NILFS_I(inode)->i_flags;
131
132 /*
133 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
134 * relevant capability.
135 */
136 ret = -EPERM;
137 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
138 !capable(CAP_LINUX_IMMUTABLE))
139 goto out;
140
141 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
142 if (ret)
143 goto out;
144
145 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
146 (flags & FS_FL_USER_MODIFIABLE);
147
148 nilfs_set_inode_flags(inode);
149 inode->i_ctime = CURRENT_TIME;
150 if (IS_SYNC(inode))
151 nilfs_set_transaction_flag(NILFS_TI_SYNC);
152
153 nilfs_mark_inode_dirty(inode);
154 ret = nilfs_transaction_commit(inode->i_sb);
155out:
156 mutex_unlock(&inode->i_mutex);
157 mnt_drop_write(filp->f_path.mnt);
158 return ret;
159}
160
161static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
162{
163 return put_user(inode->i_generation, (int __user *)argp);
164}
165
166static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
167 unsigned int cmd, void __user *argp)
168{
169 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
170 struct nilfs_transaction_info ti;
171 struct nilfs_cpmode cpmode;
172 int ret;
173
174 if (!capable(CAP_SYS_ADMIN))
175 return -EPERM;
176
177 ret = mnt_want_write(filp->f_path.mnt);
178 if (ret)
179 return ret;
180
181 ret = -EFAULT;
182 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
183 goto out;
184
185 down_read(&inode->i_sb->s_umount);
186
187 nilfs_transaction_begin(inode->i_sb, &ti, 0);
188 ret = nilfs_cpfile_change_cpmode(
189 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
190 if (unlikely(ret < 0))
191 nilfs_transaction_abort(inode->i_sb);
192 else
193 nilfs_transaction_commit(inode->i_sb); /* never fails */
194
195 up_read(&inode->i_sb->s_umount);
196out:
197 mnt_drop_write(filp->f_path.mnt);
198 return ret;
199}
200
201static int
202nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
203 unsigned int cmd, void __user *argp)
204{
205 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
206 struct nilfs_transaction_info ti;
207 __u64 cno;
208 int ret;
209
210 if (!capable(CAP_SYS_ADMIN))
211 return -EPERM;
212
213 ret = mnt_want_write(filp->f_path.mnt);
214 if (ret)
215 return ret;
216
217 ret = -EFAULT;
218 if (copy_from_user(&cno, argp, sizeof(cno)))
219 goto out;
220
221 nilfs_transaction_begin(inode->i_sb, &ti, 0);
222 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
223 if (unlikely(ret < 0))
224 nilfs_transaction_abort(inode->i_sb);
225 else
226 nilfs_transaction_commit(inode->i_sb); /* never fails */
227out:
228 mnt_drop_write(filp->f_path.mnt);
229 return ret;
230}
231
232static ssize_t
233nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
234 void *buf, size_t size, size_t nmembs)
235{
236 int ret;
237
238 down_read(&nilfs->ns_segctor_sem);
239 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
240 size, nmembs);
241 up_read(&nilfs->ns_segctor_sem);
242 return ret;
243}
244
245static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
246 unsigned int cmd, void __user *argp)
247{
248 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
249 struct nilfs_cpstat cpstat;
250 int ret;
251
252 down_read(&nilfs->ns_segctor_sem);
253 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
254 up_read(&nilfs->ns_segctor_sem);
255 if (ret < 0)
256 return ret;
257
258 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
259 ret = -EFAULT;
260 return ret;
261}
262
263static ssize_t
264nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
265 void *buf, size_t size, size_t nmembs)
266{
267 int ret;
268
269 down_read(&nilfs->ns_segctor_sem);
270 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
271 nmembs);
272 up_read(&nilfs->ns_segctor_sem);
273 return ret;
274}
275
276static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
277 unsigned int cmd, void __user *argp)
278{
279 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
280 struct nilfs_sustat sustat;
281 int ret;
282
283 down_read(&nilfs->ns_segctor_sem);
284 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
285 up_read(&nilfs->ns_segctor_sem);
286 if (ret < 0)
287 return ret;
288
289 if (copy_to_user(argp, &sustat, sizeof(sustat)))
290 ret = -EFAULT;
291 return ret;
292}
293
294static ssize_t
295nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
296 void *buf, size_t size, size_t nmembs)
297{
298 int ret;
299
300 down_read(&nilfs->ns_segctor_sem);
301 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
302 up_read(&nilfs->ns_segctor_sem);
303 return ret;
304}
305
306static ssize_t
307nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
308 void *buf, size_t size, size_t nmembs)
309{
310 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
311 struct nilfs_bdesc *bdescs = buf;
312 int ret, i;
313
314 down_read(&nilfs->ns_segctor_sem);
315 for (i = 0; i < nmembs; i++) {
316 ret = nilfs_bmap_lookup_at_level(bmap,
317 bdescs[i].bd_offset,
318 bdescs[i].bd_level + 1,
319 &bdescs[i].bd_blocknr);
320 if (ret < 0) {
321 if (ret != -ENOENT) {
322 up_read(&nilfs->ns_segctor_sem);
323 return ret;
324 }
325 bdescs[i].bd_blocknr = 0;
326 }
327 }
328 up_read(&nilfs->ns_segctor_sem);
329 return nmembs;
330}
331
332static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
333 unsigned int cmd, void __user *argp)
334{
335 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
336 struct nilfs_argv argv;
337 int ret;
338
339 if (copy_from_user(&argv, argp, sizeof(argv)))
340 return -EFAULT;
341
342 if (argv.v_size != sizeof(struct nilfs_bdesc))
343 return -EINVAL;
344
345 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
346 nilfs_ioctl_do_get_bdescs);
347 if (ret < 0)
348 return ret;
349
350 if (copy_to_user(argp, &argv, sizeof(argv)))
351 ret = -EFAULT;
352 return ret;
353}
354
355static int nilfs_ioctl_move_inode_block(struct inode *inode,
356 struct nilfs_vdesc *vdesc,
357 struct list_head *buffers)
358{
359 struct buffer_head *bh;
360 int ret;
361
362 if (vdesc->vd_flags == 0)
363 ret = nilfs_gccache_submit_read_data(
364 inode, vdesc->vd_offset, vdesc->vd_blocknr,
365 vdesc->vd_vblocknr, &bh);
366 else
367 ret = nilfs_gccache_submit_read_node(
368 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
369
370 if (unlikely(ret < 0)) {
371 if (ret == -ENOENT)
372 printk(KERN_CRIT
373 "%s: invalid virtual block address (%s): "
374 "ino=%llu, cno=%llu, offset=%llu, "
375 "blocknr=%llu, vblocknr=%llu\n",
376 __func__, vdesc->vd_flags ? "node" : "data",
377 (unsigned long long)vdesc->vd_ino,
378 (unsigned long long)vdesc->vd_cno,
379 (unsigned long long)vdesc->vd_offset,
380 (unsigned long long)vdesc->vd_blocknr,
381 (unsigned long long)vdesc->vd_vblocknr);
382 return ret;
383 }
384 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
385 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
386 "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
387 __func__, vdesc->vd_flags ? "node" : "data",
388 (unsigned long long)vdesc->vd_ino,
389 (unsigned long long)vdesc->vd_cno,
390 (unsigned long long)vdesc->vd_offset,
391 (unsigned long long)vdesc->vd_blocknr,
392 (unsigned long long)vdesc->vd_vblocknr);
393 brelse(bh);
394 return -EEXIST;
395 }
396 list_add_tail(&bh->b_assoc_buffers, buffers);
397 return 0;
398}
399
400static int nilfs_ioctl_move_blocks(struct super_block *sb,
401 struct nilfs_argv *argv, void *buf)
402{
403 size_t nmembs = argv->v_nmembs;
404 struct the_nilfs *nilfs = sb->s_fs_info;
405 struct inode *inode;
406 struct nilfs_vdesc *vdesc;
407 struct buffer_head *bh, *n;
408 LIST_HEAD(buffers);
409 ino_t ino;
410 __u64 cno;
411 int i, ret;
412
413 for (i = 0, vdesc = buf; i < nmembs; ) {
414 ino = vdesc->vd_ino;
415 cno = vdesc->vd_cno;
416 inode = nilfs_iget_for_gc(sb, ino, cno);
417 if (IS_ERR(inode)) {
418 ret = PTR_ERR(inode);
419 goto failed;
420 }
421 if (list_empty(&NILFS_I(inode)->i_dirty)) {
422 /*
423 * Add the inode to GC inode list. Garbage Collection
424 * is serialized and no two processes manipulate the
425 * list simultaneously.
426 */
427 igrab(inode);
428 list_add(&NILFS_I(inode)->i_dirty,
429 &nilfs->ns_gc_inodes);
430 }
431
432 do {
433 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
434 &buffers);
435 if (unlikely(ret < 0)) {
436 iput(inode);
437 goto failed;
438 }
439 vdesc++;
440 } while (++i < nmembs &&
441 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
442
443 iput(inode); /* The inode still remains in GC inode list */
444 }
445
446 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
447 ret = nilfs_gccache_wait_and_mark_dirty(bh);
448 if (unlikely(ret < 0)) {
449 WARN_ON(ret == -EEXIST);
450 goto failed;
451 }
452 list_del_init(&bh->b_assoc_buffers);
453 brelse(bh);
454 }
455 return nmembs;
456
457 failed:
458 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
459 list_del_init(&bh->b_assoc_buffers);
460 brelse(bh);
461 }
462 return ret;
463}
464
465static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
466 struct nilfs_argv *argv, void *buf)
467{
468 size_t nmembs = argv->v_nmembs;
469 struct inode *cpfile = nilfs->ns_cpfile;
470 struct nilfs_period *periods = buf;
471 int ret, i;
472
473 for (i = 0; i < nmembs; i++) {
474 ret = nilfs_cpfile_delete_checkpoints(
475 cpfile, periods[i].p_start, periods[i].p_end);
476 if (ret < 0)
477 return ret;
478 }
479 return nmembs;
480}
481
482static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
483 struct nilfs_argv *argv, void *buf)
484{
485 size_t nmembs = argv->v_nmembs;
486 int ret;
487
488 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
489
490 return (ret < 0) ? ret : nmembs;
491}
492
493static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
494 struct nilfs_argv *argv, void *buf)
495{
496 size_t nmembs = argv->v_nmembs;
497 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
498 struct nilfs_bdesc *bdescs = buf;
499 int ret, i;
500
501 for (i = 0; i < nmembs; i++) {
502 /* XXX: use macro or inline func to check liveness */
503 ret = nilfs_bmap_lookup_at_level(bmap,
504 bdescs[i].bd_offset,
505 bdescs[i].bd_level + 1,
506 &bdescs[i].bd_blocknr);
507 if (ret < 0) {
508 if (ret != -ENOENT)
509 return ret;
510 bdescs[i].bd_blocknr = 0;
511 }
512 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
513 /* skip dead block */
514 continue;
515 if (bdescs[i].bd_level == 0) {
516 ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
517 bdescs[i].bd_offset);
518 if (ret < 0) {
519 WARN_ON(ret == -ENOENT);
520 return ret;
521 }
522 } else {
523 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
524 bdescs[i].bd_level);
525 if (ret < 0) {
526 WARN_ON(ret == -ENOENT);
527 return ret;
528 }
529 }
530 }
531 return nmembs;
532}
533
534int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
535 struct nilfs_argv *argv, void **kbufs)
536{
537 const char *msg;
538 int ret;
539
540 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
541 if (ret < 0) {
542 /*
543 * can safely abort because checkpoints can be removed
544 * independently.
545 */
546 msg = "cannot delete checkpoints";
547 goto failed;
548 }
549 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
550 if (ret < 0) {
551 /*
552 * can safely abort because DAT file is updated atomically
553 * using a copy-on-write technique.
554 */
555 msg = "cannot delete virtual blocks from DAT file";
556 goto failed;
557 }
558 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
559 if (ret < 0) {
560 /*
561 * can safely abort because the operation is nondestructive.
562 */
563 msg = "cannot mark copying blocks dirty";
564 goto failed;
565 }
566 return 0;
567
568 failed:
569 printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
570 msg, ret);
571 return ret;
572}
573
574static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
575 unsigned int cmd, void __user *argp)
576{
577 struct nilfs_argv argv[5];
578 static const size_t argsz[5] = {
579 sizeof(struct nilfs_vdesc),
580 sizeof(struct nilfs_period),
581 sizeof(__u64),
582 sizeof(struct nilfs_bdesc),
583 sizeof(__u64),
584 };
585 void __user *base;
586 void *kbufs[5];
587 struct the_nilfs *nilfs;
588 size_t len, nsegs;
589 int n, ret;
590
591 if (!capable(CAP_SYS_ADMIN))
592 return -EPERM;
593
594 ret = mnt_want_write(filp->f_path.mnt);
595 if (ret)
596 return ret;
597
598 ret = -EFAULT;
599 if (copy_from_user(argv, argp, sizeof(argv)))
600 goto out;
601
602 ret = -EINVAL;
603 nsegs = argv[4].v_nmembs;
604 if (argv[4].v_size != argsz[4])
605 goto out;
606
607 /*
608 * argv[4] points to segment numbers this ioctl cleans. We
609 * use kmalloc() for its buffer because memory used for the
610 * segment numbers is enough small.
611 */
612 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
613 nsegs * sizeof(__u64));
614 if (IS_ERR(kbufs[4])) {
615 ret = PTR_ERR(kbufs[4]);
616 goto out;
617 }
618 nilfs = inode->i_sb->s_fs_info;
619
620 for (n = 0; n < 4; n++) {
621 ret = -EINVAL;
622 if (argv[n].v_size != argsz[n])
623 goto out_free;
624
625 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
626 goto out_free;
627
628 len = argv[n].v_size * argv[n].v_nmembs;
629 base = (void __user *)(unsigned long)argv[n].v_base;
630 if (len == 0) {
631 kbufs[n] = NULL;
632 continue;
633 }
634
635 kbufs[n] = vmalloc(len);
636 if (!kbufs[n]) {
637 ret = -ENOMEM;
638 goto out_free;
639 }
640 if (copy_from_user(kbufs[n], base, len)) {
641 ret = -EFAULT;
642 vfree(kbufs[n]);
643 goto out_free;
644 }
645 }
646
647 /*
648 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
649 * which will operates an inode list without blocking.
650 * To protect the list from concurrent operations,
651 * nilfs_ioctl_move_blocks should be atomic operation.
652 */
653 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
654 ret = -EBUSY;
655 goto out_free;
656 }
657
658 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
659
660 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
661 if (ret < 0)
662 printk(KERN_ERR "NILFS: GC failed during preparation: "
663 "cannot read source blocks: err=%d\n", ret);
664 else
665 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
666
667 nilfs_remove_all_gcinodes(nilfs);
668 clear_nilfs_gc_running(nilfs);
669
670out_free:
671 while (--n >= 0)
672 vfree(kbufs[n]);
673 kfree(kbufs[4]);
674out:
675 mnt_drop_write(filp->f_path.mnt);
676 return ret;
677}
678
679static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
680 unsigned int cmd, void __user *argp)
681{
682 __u64 cno;
683 int ret;
684 struct the_nilfs *nilfs;
685
686 ret = nilfs_construct_segment(inode->i_sb);
687 if (ret < 0)
688 return ret;
689
690 if (argp != NULL) {
691 nilfs = inode->i_sb->s_fs_info;
692 down_read(&nilfs->ns_segctor_sem);
693 cno = nilfs->ns_cno - 1;
694 up_read(&nilfs->ns_segctor_sem);
695 if (copy_to_user(argp, &cno, sizeof(cno)))
696 return -EFAULT;
697 }
698 return 0;
699}
700
701static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
702 void __user *argp)
703{
704 __u64 newsize;
705 int ret = -EPERM;
706
707 if (!capable(CAP_SYS_ADMIN))
708 goto out;
709
710 ret = mnt_want_write(filp->f_path.mnt);
711 if (ret)
712 goto out;
713
714 ret = -EFAULT;
715 if (copy_from_user(&newsize, argp, sizeof(newsize)))
716 goto out_drop_write;
717
718 ret = nilfs_resize_fs(inode->i_sb, newsize);
719
720out_drop_write:
721 mnt_drop_write(filp->f_path.mnt);
722out:
723 return ret;
724}
725
726static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
727{
728 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
729 __u64 range[2];
730 __u64 minseg, maxseg;
731 unsigned long segbytes;
732 int ret = -EPERM;
733
734 if (!capable(CAP_SYS_ADMIN))
735 goto out;
736
737 ret = -EFAULT;
738 if (copy_from_user(range, argp, sizeof(__u64[2])))
739 goto out;
740
741 ret = -ERANGE;
742 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
743 goto out;
744
745 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
746
747 minseg = range[0] + segbytes - 1;
748 do_div(minseg, segbytes);
749 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
750 do_div(maxseg, segbytes);
751 maxseg--;
752
753 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
754out:
755 return ret;
756}
757
758static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
759 unsigned int cmd, void __user *argp,
760 size_t membsz,
761 ssize_t (*dofunc)(struct the_nilfs *,
762 __u64 *, int,
763 void *, size_t, size_t))
764
765{
766 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
767 struct nilfs_argv argv;
768 int ret;
769
770 if (copy_from_user(&argv, argp, sizeof(argv)))
771 return -EFAULT;
772
773 if (argv.v_size < membsz)
774 return -EINVAL;
775
776 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
777 if (ret < 0)
778 return ret;
779
780 if (copy_to_user(argp, &argv, sizeof(argv)))
781 ret = -EFAULT;
782 return ret;
783}
784
785long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
786{
787 struct inode *inode = filp->f_dentry->d_inode;
788 void __user *argp = (void __user *)arg;
789
790 switch (cmd) {
791 case FS_IOC_GETFLAGS:
792 return nilfs_ioctl_getflags(inode, argp);
793 case FS_IOC_SETFLAGS:
794 return nilfs_ioctl_setflags(inode, filp, argp);
795 case FS_IOC_GETVERSION:
796 return nilfs_ioctl_getversion(inode, argp);
797 case NILFS_IOCTL_CHANGE_CPMODE:
798 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
799 case NILFS_IOCTL_DELETE_CHECKPOINT:
800 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
801 case NILFS_IOCTL_GET_CPINFO:
802 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
803 sizeof(struct nilfs_cpinfo),
804 nilfs_ioctl_do_get_cpinfo);
805 case NILFS_IOCTL_GET_CPSTAT:
806 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
807 case NILFS_IOCTL_GET_SUINFO:
808 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
809 sizeof(struct nilfs_suinfo),
810 nilfs_ioctl_do_get_suinfo);
811 case NILFS_IOCTL_GET_SUSTAT:
812 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
813 case NILFS_IOCTL_GET_VINFO:
814 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
815 sizeof(struct nilfs_vinfo),
816 nilfs_ioctl_do_get_vinfo);
817 case NILFS_IOCTL_GET_BDESCS:
818 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
819 case NILFS_IOCTL_CLEAN_SEGMENTS:
820 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
821 case NILFS_IOCTL_SYNC:
822 return nilfs_ioctl_sync(inode, filp, cmd, argp);
823 case NILFS_IOCTL_RESIZE:
824 return nilfs_ioctl_resize(inode, filp, argp);
825 case NILFS_IOCTL_SET_ALLOC_RANGE:
826 return nilfs_ioctl_set_alloc_range(inode, argp);
827 default:
828 return -ENOTTY;
829 }
830}
831
832#ifdef CONFIG_COMPAT
833long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
834{
835 switch (cmd) {
836 case FS_IOC32_GETFLAGS:
837 cmd = FS_IOC_GETFLAGS;
838 break;
839 case FS_IOC32_SETFLAGS:
840 cmd = FS_IOC_SETFLAGS;
841 break;
842 case FS_IOC32_GETVERSION:
843 cmd = FS_IOC_GETVERSION;
844 break;
845 default:
846 return -ENOIOCTLCMD;
847 }
848 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
849}
850#endif
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * 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 <linux/fileattr.h>
20#include <linux/string.h>
21#include "nilfs.h"
22#include "segment.h"
23#include "bmap.h"
24#include "cpfile.h"
25#include "sufile.h"
26#include "dat.h"
27
28/**
29 * nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
30 * @nilfs: nilfs object
31 * @argv: vector of arguments from userspace
32 * @dir: set of direction flags
33 * @dofunc: concrete function of get/set metadata info
34 *
35 * Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
36 * calling dofunc() function on the basis of @argv argument.
37 *
38 * Return Value: On success, 0 is returned and requested metadata info
39 * is copied into userspace. On error, one of the following
40 * negative error codes is returned.
41 *
42 * %-EINVAL - Invalid arguments from userspace.
43 *
44 * %-ENOMEM - Insufficient amount of memory available.
45 *
46 * %-EFAULT - Failure during execution of requested operation.
47 */
48static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
49 struct nilfs_argv *argv, int dir,
50 ssize_t (*dofunc)(struct the_nilfs *,
51 __u64 *, int,
52 void *, size_t, size_t))
53{
54 void *buf;
55 void __user *base = (void __user *)(unsigned long)argv->v_base;
56 size_t maxmembs, total, n;
57 ssize_t nr;
58 int ret, i;
59 __u64 pos, ppos;
60
61 if (argv->v_nmembs == 0)
62 return 0;
63
64 if ((size_t)argv->v_size > PAGE_SIZE)
65 return -EINVAL;
66
67 /*
68 * Reject pairs of a start item position (argv->v_index) and a
69 * total count (argv->v_nmembs) which leads position 'pos' to
70 * overflow by the increment at the end of the loop.
71 */
72 if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
73 return -EINVAL;
74
75 buf = (void *)get_zeroed_page(GFP_NOFS);
76 if (unlikely(!buf))
77 return -ENOMEM;
78 maxmembs = PAGE_SIZE / argv->v_size;
79
80 ret = 0;
81 total = 0;
82 pos = argv->v_index;
83 for (i = 0; i < argv->v_nmembs; i += n) {
84 n = (argv->v_nmembs - i < maxmembs) ?
85 argv->v_nmembs - i : maxmembs;
86 if ((dir & _IOC_WRITE) &&
87 copy_from_user(buf, base + argv->v_size * i,
88 argv->v_size * n)) {
89 ret = -EFAULT;
90 break;
91 }
92 ppos = pos;
93 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
94 n);
95 if (nr < 0) {
96 ret = nr;
97 break;
98 }
99 if ((dir & _IOC_READ) &&
100 copy_to_user(base + argv->v_size * i, buf,
101 argv->v_size * nr)) {
102 ret = -EFAULT;
103 break;
104 }
105 total += nr;
106 if ((size_t)nr < n)
107 break;
108 if (pos == ppos)
109 pos += n;
110 }
111 argv->v_nmembs = total;
112
113 free_pages((unsigned long)buf, 0);
114 return ret;
115}
116
117/**
118 * nilfs_fileattr_get - retrieve miscellaneous file attributes
119 * @dentry: the object to retrieve from
120 * @fa: fileattr pointer
121 *
122 * Return: always 0 as success.
123 */
124int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
125{
126 struct inode *inode = d_inode(dentry);
127
128 fileattr_fill_flags(fa, NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE);
129
130 return 0;
131}
132
133/**
134 * nilfs_fileattr_set - change miscellaneous file attributes
135 * @idmap: idmap of the mount
136 * @dentry: the object to change
137 * @fa: fileattr pointer
138 *
139 * Return: 0 on success, or a negative error code on failure.
140 */
141int nilfs_fileattr_set(struct mnt_idmap *idmap,
142 struct dentry *dentry, struct fileattr *fa)
143{
144 struct inode *inode = d_inode(dentry);
145 struct nilfs_transaction_info ti;
146 unsigned int flags, oldflags;
147 int ret;
148
149 if (fileattr_has_fsx(fa))
150 return -EOPNOTSUPP;
151
152 flags = nilfs_mask_flags(inode->i_mode, fa->flags);
153
154 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
155 if (ret)
156 return ret;
157
158 oldflags = NILFS_I(inode)->i_flags & ~FS_FL_USER_MODIFIABLE;
159 NILFS_I(inode)->i_flags = oldflags | (flags & FS_FL_USER_MODIFIABLE);
160
161 nilfs_set_inode_flags(inode);
162 inode_set_ctime_current(inode);
163 if (IS_SYNC(inode))
164 nilfs_set_transaction_flag(NILFS_TI_SYNC);
165
166 nilfs_mark_inode_dirty(inode);
167 return nilfs_transaction_commit(inode->i_sb);
168}
169
170/**
171 * nilfs_ioctl_getversion - get info about a file's version (generation number)
172 * @inode: inode object
173 * @argp: userspace memory where the generation number of @inode is stored
174 *
175 * Return: 0 on success, or %-EFAULT on error.
176 */
177static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
178{
179 return put_user(inode->i_generation, (int __user *)argp);
180}
181
182/**
183 * nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
184 * @inode: inode object
185 * @filp: file object
186 * @cmd: ioctl's request code
187 * @argp: pointer on argument from userspace
188 *
189 * Description: nilfs_ioctl_change_cpmode() function changes mode of
190 * given checkpoint between checkpoint and snapshot state. This ioctl
191 * is used in chcp and mkcp utilities.
192 *
193 * Return Value: On success, 0 is returned and mode of a checkpoint is
194 * changed. On error, one of the following negative error codes
195 * is returned.
196 *
197 * %-EPERM - Operation not permitted.
198 *
199 * %-EFAULT - Failure during checkpoint mode changing.
200 */
201static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
202 unsigned int cmd, void __user *argp)
203{
204 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
205 struct nilfs_transaction_info ti;
206 struct nilfs_cpmode cpmode;
207 int ret;
208
209 if (!capable(CAP_SYS_ADMIN))
210 return -EPERM;
211
212 ret = mnt_want_write_file(filp);
213 if (ret)
214 return ret;
215
216 ret = -EFAULT;
217 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
218 goto out;
219
220 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
221
222 nilfs_transaction_begin(inode->i_sb, &ti, 0);
223 ret = nilfs_cpfile_change_cpmode(
224 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
225 if (unlikely(ret < 0))
226 nilfs_transaction_abort(inode->i_sb);
227 else
228 nilfs_transaction_commit(inode->i_sb); /* never fails */
229
230 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
231out:
232 mnt_drop_write_file(filp);
233 return ret;
234}
235
236/**
237 * nilfs_ioctl_delete_checkpoint - remove checkpoint
238 * @inode: inode object
239 * @filp: file object
240 * @cmd: ioctl's request code
241 * @argp: pointer on argument from userspace
242 *
243 * Description: nilfs_ioctl_delete_checkpoint() function removes
244 * checkpoint from NILFS2 file system. This ioctl is used in rmcp
245 * utility.
246 *
247 * Return Value: On success, 0 is returned and a checkpoint is
248 * removed. On error, one of the following negative error codes
249 * is returned.
250 *
251 * %-EPERM - Operation not permitted.
252 *
253 * %-EFAULT - Failure during checkpoint removing.
254 */
255static int
256nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
257 unsigned int cmd, void __user *argp)
258{
259 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
260 struct nilfs_transaction_info ti;
261 __u64 cno;
262 int ret;
263
264 if (!capable(CAP_SYS_ADMIN))
265 return -EPERM;
266
267 ret = mnt_want_write_file(filp);
268 if (ret)
269 return ret;
270
271 ret = -EFAULT;
272 if (copy_from_user(&cno, argp, sizeof(cno)))
273 goto out;
274
275 nilfs_transaction_begin(inode->i_sb, &ti, 0);
276 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
277 if (unlikely(ret < 0))
278 nilfs_transaction_abort(inode->i_sb);
279 else
280 nilfs_transaction_commit(inode->i_sb); /* never fails */
281out:
282 mnt_drop_write_file(filp);
283 return ret;
284}
285
286/**
287 * nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
288 * @nilfs: nilfs object
289 * @posp: pointer on array of checkpoint's numbers
290 * @flags: checkpoint mode (checkpoint or snapshot)
291 * @buf: buffer for storing checkponts' info
292 * @size: size in bytes of one checkpoint info item in array
293 * @nmembs: number of checkpoints in array (numbers and infos)
294 *
295 * Description: nilfs_ioctl_do_get_cpinfo() function returns info about
296 * requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
297 * lscp utility and by nilfs_cleanerd daemon.
298 *
299 * Return value: count of nilfs_cpinfo structures in output buffer.
300 */
301static ssize_t
302nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
303 void *buf, size_t size, size_t nmembs)
304{
305 int ret;
306
307 down_read(&nilfs->ns_segctor_sem);
308 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
309 size, nmembs);
310 up_read(&nilfs->ns_segctor_sem);
311 return ret;
312}
313
314/**
315 * nilfs_ioctl_get_cpstat - get checkpoints statistics
316 * @inode: inode object
317 * @filp: file object
318 * @cmd: ioctl's request code
319 * @argp: pointer on argument from userspace
320 *
321 * Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
322 * The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
323 * and by nilfs_cleanerd daemon.
324 *
325 * Return Value: On success, 0 is returned, and checkpoints information is
326 * copied into userspace pointer @argp. On error, one of the following
327 * negative error codes is returned.
328 *
329 * %-EIO - I/O error.
330 *
331 * %-ENOMEM - Insufficient amount of memory available.
332 *
333 * %-EFAULT - Failure during getting checkpoints statistics.
334 */
335static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
336 unsigned int cmd, void __user *argp)
337{
338 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
339 struct nilfs_cpstat cpstat;
340 int ret;
341
342 down_read(&nilfs->ns_segctor_sem);
343 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
344 up_read(&nilfs->ns_segctor_sem);
345 if (ret < 0)
346 return ret;
347
348 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
349 ret = -EFAULT;
350 return ret;
351}
352
353/**
354 * nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
355 * @nilfs: nilfs object
356 * @posp: pointer on array of segment numbers
357 * @flags: *not used*
358 * @buf: buffer for storing suinfo array
359 * @size: size in bytes of one suinfo item in array
360 * @nmembs: count of segment numbers and suinfos in array
361 *
362 * Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
363 * info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
364 * in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
365 *
366 * Return value: count of nilfs_suinfo structures in output buffer.
367 */
368static ssize_t
369nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
370 void *buf, size_t size, size_t nmembs)
371{
372 int ret;
373
374 down_read(&nilfs->ns_segctor_sem);
375 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
376 nmembs);
377 up_read(&nilfs->ns_segctor_sem);
378 return ret;
379}
380
381/**
382 * nilfs_ioctl_get_sustat - get segment usage statistics
383 * @inode: inode object
384 * @filp: file object
385 * @cmd: ioctl's request code
386 * @argp: pointer on argument from userspace
387 *
388 * Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
389 * The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
390 * and by nilfs_cleanerd daemon.
391 *
392 * Return Value: On success, 0 is returned, and segment usage information is
393 * copied into userspace pointer @argp. On error, one of the following
394 * negative error codes is returned.
395 *
396 * %-EIO - I/O error.
397 *
398 * %-ENOMEM - Insufficient amount of memory available.
399 *
400 * %-EFAULT - Failure during getting segment usage statistics.
401 */
402static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
403 unsigned int cmd, void __user *argp)
404{
405 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
406 struct nilfs_sustat sustat;
407 int ret;
408
409 down_read(&nilfs->ns_segctor_sem);
410 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
411 up_read(&nilfs->ns_segctor_sem);
412 if (ret < 0)
413 return ret;
414
415 if (copy_to_user(argp, &sustat, sizeof(sustat)))
416 ret = -EFAULT;
417 return ret;
418}
419
420/**
421 * nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
422 * @nilfs: nilfs object
423 * @posp: *not used*
424 * @flags: *not used*
425 * @buf: buffer for storing array of nilfs_vinfo structures
426 * @size: size in bytes of one vinfo item in array
427 * @nmembs: count of vinfos in array
428 *
429 * Description: nilfs_ioctl_do_get_vinfo() function returns information
430 * on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
431 * by nilfs_cleanerd daemon.
432 *
433 * Return value: count of nilfs_vinfo structures in output buffer.
434 */
435static ssize_t
436nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
437 void *buf, size_t size, size_t nmembs)
438{
439 int ret;
440
441 down_read(&nilfs->ns_segctor_sem);
442 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
443 up_read(&nilfs->ns_segctor_sem);
444 return ret;
445}
446
447/**
448 * nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
449 * @nilfs: nilfs object
450 * @posp: *not used*
451 * @flags: *not used*
452 * @buf: buffer for storing array of nilfs_bdesc structures
453 * @size: size in bytes of one bdesc item in array
454 * @nmembs: count of bdescs in array
455 *
456 * Description: nilfs_ioctl_do_get_bdescs() function returns information
457 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
458 * is used by nilfs_cleanerd daemon.
459 *
460 * Return value: count of nilfs_bdescs structures in output buffer.
461 */
462static ssize_t
463nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
464 void *buf, size_t size, size_t nmembs)
465{
466 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
467 struct nilfs_bdesc *bdescs = buf;
468 int ret, i;
469
470 down_read(&nilfs->ns_segctor_sem);
471 for (i = 0; i < nmembs; i++) {
472 ret = nilfs_bmap_lookup_at_level(bmap,
473 bdescs[i].bd_offset,
474 bdescs[i].bd_level + 1,
475 &bdescs[i].bd_blocknr);
476 if (ret < 0) {
477 if (ret != -ENOENT) {
478 up_read(&nilfs->ns_segctor_sem);
479 return ret;
480 }
481 bdescs[i].bd_blocknr = 0;
482 }
483 }
484 up_read(&nilfs->ns_segctor_sem);
485 return nmembs;
486}
487
488/**
489 * nilfs_ioctl_get_bdescs - get disk block descriptors
490 * @inode: inode object
491 * @filp: file object
492 * @cmd: ioctl's request code
493 * @argp: pointer on argument from userspace
494 *
495 * Description: nilfs_ioctl_do_get_bdescs() function returns information
496 * about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
497 * is used by nilfs_cleanerd daemon.
498 *
499 * Return Value: On success, 0 is returned, and disk block descriptors are
500 * copied into userspace pointer @argp. On error, one of the following
501 * negative error codes is returned.
502 *
503 * %-EINVAL - Invalid arguments from userspace.
504 *
505 * %-EIO - I/O error.
506 *
507 * %-ENOMEM - Insufficient amount of memory available.
508 *
509 * %-EFAULT - Failure during getting disk block descriptors.
510 */
511static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
512 unsigned int cmd, void __user *argp)
513{
514 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
515 struct nilfs_argv argv;
516 int ret;
517
518 if (copy_from_user(&argv, argp, sizeof(argv)))
519 return -EFAULT;
520
521 if (argv.v_size != sizeof(struct nilfs_bdesc))
522 return -EINVAL;
523
524 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
525 nilfs_ioctl_do_get_bdescs);
526 if (ret < 0)
527 return ret;
528
529 if (copy_to_user(argp, &argv, sizeof(argv)))
530 ret = -EFAULT;
531 return ret;
532}
533
534/**
535 * nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
536 * @inode: inode object
537 * @vdesc: descriptor of virtual block number
538 * @buffers: list of moving buffers
539 *
540 * Description: nilfs_ioctl_move_inode_block() function registers data/node
541 * buffer in the GC pagecache and submit read request.
542 *
543 * Return Value: On success, 0 is returned. On error, one of the following
544 * negative error codes is returned.
545 *
546 * %-EIO - I/O error.
547 *
548 * %-ENOMEM - Insufficient amount of memory available.
549 *
550 * %-ENOENT - Requested block doesn't exist.
551 *
552 * %-EEXIST - Blocks conflict is detected.
553 */
554static int nilfs_ioctl_move_inode_block(struct inode *inode,
555 struct nilfs_vdesc *vdesc,
556 struct list_head *buffers)
557{
558 struct buffer_head *bh;
559 int ret;
560
561 if (vdesc->vd_flags == 0)
562 ret = nilfs_gccache_submit_read_data(
563 inode, vdesc->vd_offset, vdesc->vd_blocknr,
564 vdesc->vd_vblocknr, &bh);
565 else
566 ret = nilfs_gccache_submit_read_node(
567 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
568
569 if (unlikely(ret < 0)) {
570 if (ret == -ENOENT)
571 nilfs_crit(inode->i_sb,
572 "%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
573 __func__, vdesc->vd_flags ? "node" : "data",
574 (unsigned long long)vdesc->vd_ino,
575 (unsigned long long)vdesc->vd_cno,
576 (unsigned long long)vdesc->vd_offset,
577 (unsigned long long)vdesc->vd_blocknr,
578 (unsigned long long)vdesc->vd_vblocknr);
579 return ret;
580 }
581 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
582 nilfs_crit(inode->i_sb,
583 "%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
584 __func__, vdesc->vd_flags ? "node" : "data",
585 (unsigned long long)vdesc->vd_ino,
586 (unsigned long long)vdesc->vd_cno,
587 (unsigned long long)vdesc->vd_offset,
588 (unsigned long long)vdesc->vd_blocknr,
589 (unsigned long long)vdesc->vd_vblocknr);
590 brelse(bh);
591 return -EEXIST;
592 }
593 list_add_tail(&bh->b_assoc_buffers, buffers);
594 return 0;
595}
596
597/**
598 * nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
599 * @sb: superblock object
600 * @argv: vector of arguments from userspace
601 * @buf: array of nilfs_vdesc structures
602 *
603 * Description: nilfs_ioctl_move_blocks() function reads valid data/node
604 * blocks that garbage collector specified with the array of nilfs_vdesc
605 * structures and stores them into page caches of GC inodes.
606 *
607 * Return Value: Number of processed nilfs_vdesc structures or
608 * error code, otherwise.
609 */
610static int nilfs_ioctl_move_blocks(struct super_block *sb,
611 struct nilfs_argv *argv, void *buf)
612{
613 size_t nmembs = argv->v_nmembs;
614 struct the_nilfs *nilfs = sb->s_fs_info;
615 struct inode *inode;
616 struct nilfs_vdesc *vdesc;
617 struct buffer_head *bh, *n;
618 LIST_HEAD(buffers);
619 ino_t ino;
620 __u64 cno;
621 int i, ret;
622
623 for (i = 0, vdesc = buf; i < nmembs; ) {
624 ino = vdesc->vd_ino;
625 cno = vdesc->vd_cno;
626 inode = nilfs_iget_for_gc(sb, ino, cno);
627 if (IS_ERR(inode)) {
628 ret = PTR_ERR(inode);
629 goto failed;
630 }
631 if (list_empty(&NILFS_I(inode)->i_dirty)) {
632 /*
633 * Add the inode to GC inode list. Garbage Collection
634 * is serialized and no two processes manipulate the
635 * list simultaneously.
636 */
637 igrab(inode);
638 list_add(&NILFS_I(inode)->i_dirty,
639 &nilfs->ns_gc_inodes);
640 }
641
642 do {
643 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
644 &buffers);
645 if (unlikely(ret < 0)) {
646 iput(inode);
647 goto failed;
648 }
649 vdesc++;
650 } while (++i < nmembs &&
651 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
652
653 iput(inode); /* The inode still remains in GC inode list */
654 }
655
656 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
657 ret = nilfs_gccache_wait_and_mark_dirty(bh);
658 if (unlikely(ret < 0)) {
659 WARN_ON(ret == -EEXIST);
660 goto failed;
661 }
662 list_del_init(&bh->b_assoc_buffers);
663 brelse(bh);
664 }
665 return nmembs;
666
667 failed:
668 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
669 list_del_init(&bh->b_assoc_buffers);
670 brelse(bh);
671 }
672 return ret;
673}
674
675/**
676 * nilfs_ioctl_delete_checkpoints - delete checkpoints
677 * @nilfs: nilfs object
678 * @argv: vector of arguments from userspace
679 * @buf: array of periods of checkpoints numbers
680 *
681 * Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
682 * in the period from p_start to p_end, excluding p_end itself. The checkpoints
683 * which have been already deleted are ignored.
684 *
685 * Return Value: Number of processed nilfs_period structures or
686 * error code, otherwise.
687 *
688 * %-EIO - I/O error.
689 *
690 * %-ENOMEM - Insufficient amount of memory available.
691 *
692 * %-EINVAL - invalid checkpoints.
693 */
694static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
695 struct nilfs_argv *argv, void *buf)
696{
697 size_t nmembs = argv->v_nmembs;
698 struct inode *cpfile = nilfs->ns_cpfile;
699 struct nilfs_period *periods = buf;
700 int ret, i;
701
702 for (i = 0; i < nmembs; i++) {
703 ret = nilfs_cpfile_delete_checkpoints(
704 cpfile, periods[i].p_start, periods[i].p_end);
705 if (ret < 0)
706 return ret;
707 }
708 return nmembs;
709}
710
711/**
712 * nilfs_ioctl_free_vblocknrs - free virtual block numbers
713 * @nilfs: nilfs object
714 * @argv: vector of arguments from userspace
715 * @buf: array of virtual block numbers
716 *
717 * Description: nilfs_ioctl_free_vblocknrs() function frees
718 * the virtual block numbers specified by @buf and @argv->v_nmembs.
719 *
720 * Return Value: Number of processed virtual block numbers or
721 * error code, otherwise.
722 *
723 * %-EIO - I/O error.
724 *
725 * %-ENOMEM - Insufficient amount of memory available.
726 *
727 * %-ENOENT - The virtual block number have not been allocated.
728 */
729static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
730 struct nilfs_argv *argv, void *buf)
731{
732 size_t nmembs = argv->v_nmembs;
733 int ret;
734
735 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
736
737 return (ret < 0) ? ret : nmembs;
738}
739
740/**
741 * nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
742 * @nilfs: nilfs object
743 * @argv: vector of arguments from userspace
744 * @buf: array of block descriptors
745 *
746 * Description: nilfs_ioctl_mark_blocks_dirty() function marks
747 * metadata file or data blocks as dirty.
748 *
749 * Return Value: Number of processed block descriptors or
750 * error code, otherwise.
751 *
752 * %-ENOMEM - Insufficient memory available.
753 *
754 * %-EIO - I/O error
755 *
756 * %-ENOENT - the specified block does not exist (hole block)
757 */
758static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
759 struct nilfs_argv *argv, void *buf)
760{
761 size_t nmembs = argv->v_nmembs;
762 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
763 struct nilfs_bdesc *bdescs = buf;
764 struct buffer_head *bh;
765 int ret, i;
766
767 for (i = 0; i < nmembs; i++) {
768 /* XXX: use macro or inline func to check liveness */
769 ret = nilfs_bmap_lookup_at_level(bmap,
770 bdescs[i].bd_offset,
771 bdescs[i].bd_level + 1,
772 &bdescs[i].bd_blocknr);
773 if (ret < 0) {
774 if (ret != -ENOENT)
775 return ret;
776 bdescs[i].bd_blocknr = 0;
777 }
778 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
779 /* skip dead block */
780 continue;
781 if (bdescs[i].bd_level == 0) {
782 ret = nilfs_mdt_get_block(nilfs->ns_dat,
783 bdescs[i].bd_offset,
784 false, NULL, &bh);
785 if (unlikely(ret)) {
786 WARN_ON(ret == -ENOENT);
787 return ret;
788 }
789 mark_buffer_dirty(bh);
790 nilfs_mdt_mark_dirty(nilfs->ns_dat);
791 put_bh(bh);
792 } else {
793 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
794 bdescs[i].bd_level);
795 if (ret < 0) {
796 WARN_ON(ret == -ENOENT);
797 return ret;
798 }
799 }
800 }
801 return nmembs;
802}
803
804int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
805 struct nilfs_argv *argv, void **kbufs)
806{
807 const char *msg;
808 int ret;
809
810 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
811 if (ret < 0) {
812 /*
813 * can safely abort because checkpoints can be removed
814 * independently.
815 */
816 msg = "cannot delete checkpoints";
817 goto failed;
818 }
819 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
820 if (ret < 0) {
821 /*
822 * can safely abort because DAT file is updated atomically
823 * using a copy-on-write technique.
824 */
825 msg = "cannot delete virtual blocks from DAT file";
826 goto failed;
827 }
828 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
829 if (ret < 0) {
830 /*
831 * can safely abort because the operation is nondestructive.
832 */
833 msg = "cannot mark copying blocks dirty";
834 goto failed;
835 }
836 return 0;
837
838 failed:
839 nilfs_err(nilfs->ns_sb, "error %d preparing GC: %s", ret, msg);
840 return ret;
841}
842
843/**
844 * nilfs_ioctl_clean_segments - clean segments
845 * @inode: inode object
846 * @filp: file object
847 * @cmd: ioctl's request code
848 * @argp: pointer on argument from userspace
849 *
850 * Description: nilfs_ioctl_clean_segments() function makes garbage
851 * collection operation in the environment of requested parameters
852 * from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
853 * nilfs_cleanerd daemon.
854 *
855 * Return Value: On success, 0 is returned or error code, otherwise.
856 */
857static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
858 unsigned int cmd, void __user *argp)
859{
860 struct nilfs_argv argv[5];
861 static const size_t argsz[5] = {
862 sizeof(struct nilfs_vdesc),
863 sizeof(struct nilfs_period),
864 sizeof(__u64),
865 sizeof(struct nilfs_bdesc),
866 sizeof(__u64),
867 };
868 void __user *base;
869 void *kbufs[5];
870 struct the_nilfs *nilfs;
871 size_t len, nsegs;
872 int n, ret;
873
874 if (!capable(CAP_SYS_ADMIN))
875 return -EPERM;
876
877 ret = mnt_want_write_file(filp);
878 if (ret)
879 return ret;
880
881 ret = -EFAULT;
882 if (copy_from_user(argv, argp, sizeof(argv)))
883 goto out;
884
885 ret = -EINVAL;
886 nsegs = argv[4].v_nmembs;
887 if (argv[4].v_size != argsz[4])
888 goto out;
889
890 /*
891 * argv[4] points to segment numbers this ioctl cleans. We
892 * use kmalloc() for its buffer because the memory used for the
893 * segment numbers is small enough.
894 */
895 kbufs[4] = memdup_array_user((void __user *)(unsigned long)argv[4].v_base,
896 nsegs, sizeof(__u64));
897 if (IS_ERR(kbufs[4])) {
898 ret = PTR_ERR(kbufs[4]);
899 goto out;
900 }
901 nilfs = inode->i_sb->s_fs_info;
902
903 for (n = 0; n < 4; n++) {
904 ret = -EINVAL;
905 if (argv[n].v_size != argsz[n])
906 goto out_free;
907
908 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
909 goto out_free;
910
911 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
912 goto out_free;
913
914 len = argv[n].v_size * argv[n].v_nmembs;
915 base = (void __user *)(unsigned long)argv[n].v_base;
916 if (len == 0) {
917 kbufs[n] = NULL;
918 continue;
919 }
920
921 kbufs[n] = vmalloc(len);
922 if (!kbufs[n]) {
923 ret = -ENOMEM;
924 goto out_free;
925 }
926 if (copy_from_user(kbufs[n], base, len)) {
927 ret = -EFAULT;
928 vfree(kbufs[n]);
929 goto out_free;
930 }
931 }
932
933 /*
934 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
935 * which will operates an inode list without blocking.
936 * To protect the list from concurrent operations,
937 * nilfs_ioctl_move_blocks should be atomic operation.
938 */
939 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
940 ret = -EBUSY;
941 goto out_free;
942 }
943
944 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
945 if (ret < 0) {
946 nilfs_err(inode->i_sb,
947 "error %d preparing GC: cannot read source blocks",
948 ret);
949 } else {
950 if (nilfs_sb_need_update(nilfs))
951 set_nilfs_discontinued(nilfs);
952 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
953 }
954
955 nilfs_remove_all_gcinodes(nilfs);
956 clear_nilfs_gc_running(nilfs);
957
958out_free:
959 while (--n >= 0)
960 vfree(kbufs[n]);
961 kfree(kbufs[4]);
962out:
963 mnt_drop_write_file(filp);
964 return ret;
965}
966
967/**
968 * nilfs_ioctl_sync - make a checkpoint
969 * @inode: inode object
970 * @filp: file object
971 * @cmd: ioctl's request code
972 * @argp: pointer on argument from userspace
973 *
974 * Description: nilfs_ioctl_sync() function constructs a logical segment
975 * for checkpointing. This function guarantees that all modified data
976 * and metadata are written out to the device when it successfully
977 * returned.
978 *
979 * Return Value: On success, 0 is retured. On errors, one of the following
980 * negative error code is returned.
981 *
982 * %-EROFS - Read only filesystem.
983 *
984 * %-EIO - I/O error
985 *
986 * %-ENOSPC - No space left on device (only in a panic state).
987 *
988 * %-ERESTARTSYS - Interrupted.
989 *
990 * %-ENOMEM - Insufficient memory available.
991 *
992 * %-EFAULT - Failure during execution of requested operation.
993 */
994static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
995 unsigned int cmd, void __user *argp)
996{
997 __u64 cno;
998 int ret;
999 struct the_nilfs *nilfs;
1000
1001 ret = nilfs_construct_segment(inode->i_sb);
1002 if (ret < 0)
1003 return ret;
1004
1005 nilfs = inode->i_sb->s_fs_info;
1006 ret = nilfs_flush_device(nilfs);
1007 if (ret < 0)
1008 return ret;
1009
1010 if (argp != NULL) {
1011 down_read(&nilfs->ns_segctor_sem);
1012 cno = nilfs->ns_cno - 1;
1013 up_read(&nilfs->ns_segctor_sem);
1014 if (copy_to_user(argp, &cno, sizeof(cno)))
1015 return -EFAULT;
1016 }
1017 return 0;
1018}
1019
1020/**
1021 * nilfs_ioctl_resize - resize NILFS2 volume
1022 * @inode: inode object
1023 * @filp: file object
1024 * @argp: pointer on argument from userspace
1025 *
1026 * Return Value: On success, 0 is returned or error code, otherwise.
1027 */
1028static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1029 void __user *argp)
1030{
1031 __u64 newsize;
1032 int ret = -EPERM;
1033
1034 if (!capable(CAP_SYS_ADMIN))
1035 goto out;
1036
1037 ret = mnt_want_write_file(filp);
1038 if (ret)
1039 goto out;
1040
1041 ret = -EFAULT;
1042 if (copy_from_user(&newsize, argp, sizeof(newsize)))
1043 goto out_drop_write;
1044
1045 ret = nilfs_resize_fs(inode->i_sb, newsize);
1046
1047out_drop_write:
1048 mnt_drop_write_file(filp);
1049out:
1050 return ret;
1051}
1052
1053/**
1054 * nilfs_ioctl_trim_fs() - trim ioctl handle function
1055 * @inode: inode object
1056 * @argp: pointer on argument from userspace
1057 *
1058 * Description: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1059 * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1060 * performs the actual trim operation.
1061 *
1062 * Return Value: On success, 0 is returned or negative error code, otherwise.
1063 */
1064static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1065{
1066 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1067 struct fstrim_range range;
1068 int ret;
1069
1070 if (!capable(CAP_SYS_ADMIN))
1071 return -EPERM;
1072
1073 if (!bdev_max_discard_sectors(nilfs->ns_bdev))
1074 return -EOPNOTSUPP;
1075
1076 if (copy_from_user(&range, argp, sizeof(range)))
1077 return -EFAULT;
1078
1079 range.minlen = max_t(u64, range.minlen,
1080 bdev_discard_granularity(nilfs->ns_bdev));
1081
1082 down_read(&nilfs->ns_segctor_sem);
1083 ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1084 up_read(&nilfs->ns_segctor_sem);
1085
1086 if (ret < 0)
1087 return ret;
1088
1089 if (copy_to_user(argp, &range, sizeof(range)))
1090 return -EFAULT;
1091
1092 return 0;
1093}
1094
1095/**
1096 * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1097 * @inode: inode object
1098 * @argp: pointer on argument from userspace
1099 *
1100 * Description: nilfs_ioctl_set_alloc_range() function defines lower limit
1101 * of segments in bytes and upper limit of segments in bytes.
1102 * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1103 *
1104 * Return Value: On success, 0 is returned or error code, otherwise.
1105 */
1106static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1107{
1108 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1109 __u64 range[2];
1110 __u64 minseg, maxseg;
1111 unsigned long segbytes;
1112 int ret = -EPERM;
1113
1114 if (!capable(CAP_SYS_ADMIN))
1115 goto out;
1116
1117 ret = -EFAULT;
1118 if (copy_from_user(range, argp, sizeof(__u64[2])))
1119 goto out;
1120
1121 ret = -ERANGE;
1122 if (range[1] > bdev_nr_bytes(inode->i_sb->s_bdev))
1123 goto out;
1124
1125 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1126
1127 minseg = range[0] + segbytes - 1;
1128 minseg = div64_ul(minseg, segbytes);
1129
1130 if (range[1] < 4096)
1131 goto out;
1132
1133 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1134 if (maxseg < segbytes)
1135 goto out;
1136
1137 maxseg = div64_ul(maxseg, segbytes);
1138 maxseg--;
1139
1140 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1141out:
1142 return ret;
1143}
1144
1145/**
1146 * nilfs_ioctl_get_info - wrapping function of get metadata info
1147 * @inode: inode object
1148 * @filp: file object
1149 * @cmd: ioctl's request code
1150 * @argp: pointer on argument from userspace
1151 * @membsz: size of an item in bytes
1152 * @dofunc: concrete function of getting metadata info
1153 *
1154 * Description: nilfs_ioctl_get_info() gets metadata info by means of
1155 * calling dofunc() function.
1156 *
1157 * Return Value: On success, 0 is returned and requested metadata info
1158 * is copied into userspace. On error, one of the following
1159 * negative error codes is returned.
1160 *
1161 * %-EINVAL - Invalid arguments from userspace.
1162 *
1163 * %-ENOMEM - Insufficient amount of memory available.
1164 *
1165 * %-EFAULT - Failure during execution of requested operation.
1166 */
1167static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1168 unsigned int cmd, void __user *argp,
1169 size_t membsz,
1170 ssize_t (*dofunc)(struct the_nilfs *,
1171 __u64 *, int,
1172 void *, size_t, size_t))
1173
1174{
1175 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1176 struct nilfs_argv argv;
1177 int ret;
1178
1179 if (copy_from_user(&argv, argp, sizeof(argv)))
1180 return -EFAULT;
1181
1182 if (argv.v_size < membsz)
1183 return -EINVAL;
1184
1185 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1186 if (ret < 0)
1187 return ret;
1188
1189 if (copy_to_user(argp, &argv, sizeof(argv)))
1190 ret = -EFAULT;
1191 return ret;
1192}
1193
1194/**
1195 * nilfs_ioctl_set_suinfo - set segment usage info
1196 * @inode: inode object
1197 * @filp: file object
1198 * @cmd: ioctl's request code
1199 * @argp: pointer on argument from userspace
1200 *
1201 * Description: Expects an array of nilfs_suinfo_update structures
1202 * encapsulated in nilfs_argv and updates the segment usage info
1203 * according to the flags in nilfs_suinfo_update.
1204 *
1205 * Return Value: On success, 0 is returned. On error, one of the
1206 * following negative error codes is returned.
1207 *
1208 * %-EPERM - Not enough permissions
1209 *
1210 * %-EFAULT - Error copying input data
1211 *
1212 * %-EIO - I/O error.
1213 *
1214 * %-ENOMEM - Insufficient amount of memory available.
1215 *
1216 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1217 */
1218static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1219 unsigned int cmd, void __user *argp)
1220{
1221 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1222 struct nilfs_transaction_info ti;
1223 struct nilfs_argv argv;
1224 size_t len;
1225 void __user *base;
1226 void *kbuf;
1227 int ret;
1228
1229 if (!capable(CAP_SYS_ADMIN))
1230 return -EPERM;
1231
1232 ret = mnt_want_write_file(filp);
1233 if (ret)
1234 return ret;
1235
1236 ret = -EFAULT;
1237 if (copy_from_user(&argv, argp, sizeof(argv)))
1238 goto out;
1239
1240 ret = -EINVAL;
1241 if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1242 goto out;
1243
1244 if (argv.v_nmembs > nilfs->ns_nsegments)
1245 goto out;
1246
1247 if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1248 goto out;
1249
1250 len = argv.v_size * argv.v_nmembs;
1251 if (!len) {
1252 ret = 0;
1253 goto out;
1254 }
1255
1256 base = (void __user *)(unsigned long)argv.v_base;
1257 kbuf = vmalloc(len);
1258 if (!kbuf) {
1259 ret = -ENOMEM;
1260 goto out;
1261 }
1262
1263 if (copy_from_user(kbuf, base, len)) {
1264 ret = -EFAULT;
1265 goto out_free;
1266 }
1267
1268 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1269 ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1270 argv.v_nmembs);
1271 if (unlikely(ret < 0))
1272 nilfs_transaction_abort(inode->i_sb);
1273 else
1274 nilfs_transaction_commit(inode->i_sb); /* never fails */
1275
1276out_free:
1277 vfree(kbuf);
1278out:
1279 mnt_drop_write_file(filp);
1280 return ret;
1281}
1282
1283/**
1284 * nilfs_ioctl_get_fslabel - get the volume name of the file system
1285 * @sb: super block instance
1286 * @argp: pointer to userspace memory where the volume name should be stored
1287 *
1288 * Return: 0 on success, %-EFAULT if copying to userspace memory fails.
1289 */
1290static int nilfs_ioctl_get_fslabel(struct super_block *sb, void __user *argp)
1291{
1292 struct the_nilfs *nilfs = sb->s_fs_info;
1293 char label[NILFS_MAX_VOLUME_NAME + 1];
1294
1295 BUILD_BUG_ON(NILFS_MAX_VOLUME_NAME >= FSLABEL_MAX);
1296
1297 down_read(&nilfs->ns_sem);
1298 memtostr_pad(label, nilfs->ns_sbp[0]->s_volume_name);
1299 up_read(&nilfs->ns_sem);
1300
1301 if (copy_to_user(argp, label, sizeof(label)))
1302 return -EFAULT;
1303 return 0;
1304}
1305
1306/**
1307 * nilfs_ioctl_set_fslabel - set the volume name of the file system
1308 * @sb: super block instance
1309 * @filp: file object
1310 * @argp: pointer to userspace memory that contains the volume name
1311 *
1312 * Return: 0 on success, or the following negative error code on failure.
1313 * * %-EFAULT - Error copying input data.
1314 * * %-EINVAL - Label length exceeds record size in superblock.
1315 * * %-EIO - I/O error.
1316 * * %-EPERM - Operation not permitted (insufficient permissions).
1317 * * %-EROFS - Read only file system.
1318 */
1319static int nilfs_ioctl_set_fslabel(struct super_block *sb, struct file *filp,
1320 void __user *argp)
1321{
1322 char label[NILFS_MAX_VOLUME_NAME + 1];
1323 struct the_nilfs *nilfs = sb->s_fs_info;
1324 struct nilfs_super_block **sbp;
1325 size_t len;
1326 int ret;
1327
1328 if (!capable(CAP_SYS_ADMIN))
1329 return -EPERM;
1330
1331 ret = mnt_want_write_file(filp);
1332 if (ret)
1333 return ret;
1334
1335 if (copy_from_user(label, argp, NILFS_MAX_VOLUME_NAME + 1)) {
1336 ret = -EFAULT;
1337 goto out_drop_write;
1338 }
1339
1340 len = strnlen(label, NILFS_MAX_VOLUME_NAME + 1);
1341 if (len > NILFS_MAX_VOLUME_NAME) {
1342 nilfs_err(sb, "unable to set label with more than %zu bytes",
1343 NILFS_MAX_VOLUME_NAME);
1344 ret = -EINVAL;
1345 goto out_drop_write;
1346 }
1347
1348 down_write(&nilfs->ns_sem);
1349 sbp = nilfs_prepare_super(sb, false);
1350 if (unlikely(!sbp)) {
1351 ret = -EIO;
1352 goto out_unlock;
1353 }
1354
1355 strtomem_pad(sbp[0]->s_volume_name, label, 0);
1356 if (sbp[1])
1357 strtomem_pad(sbp[1]->s_volume_name, label, 0);
1358
1359 ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
1360
1361out_unlock:
1362 up_write(&nilfs->ns_sem);
1363out_drop_write:
1364 mnt_drop_write_file(filp);
1365 return ret;
1366}
1367
1368long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1369{
1370 struct inode *inode = file_inode(filp);
1371 void __user *argp = (void __user *)arg;
1372
1373 switch (cmd) {
1374 case FS_IOC_GETVERSION:
1375 return nilfs_ioctl_getversion(inode, argp);
1376 case NILFS_IOCTL_CHANGE_CPMODE:
1377 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1378 case NILFS_IOCTL_DELETE_CHECKPOINT:
1379 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1380 case NILFS_IOCTL_GET_CPINFO:
1381 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1382 sizeof(struct nilfs_cpinfo),
1383 nilfs_ioctl_do_get_cpinfo);
1384 case NILFS_IOCTL_GET_CPSTAT:
1385 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1386 case NILFS_IOCTL_GET_SUINFO:
1387 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1388 sizeof(struct nilfs_suinfo),
1389 nilfs_ioctl_do_get_suinfo);
1390 case NILFS_IOCTL_SET_SUINFO:
1391 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
1392 case NILFS_IOCTL_GET_SUSTAT:
1393 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1394 case NILFS_IOCTL_GET_VINFO:
1395 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1396 sizeof(struct nilfs_vinfo),
1397 nilfs_ioctl_do_get_vinfo);
1398 case NILFS_IOCTL_GET_BDESCS:
1399 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1400 case NILFS_IOCTL_CLEAN_SEGMENTS:
1401 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
1402 case NILFS_IOCTL_SYNC:
1403 return nilfs_ioctl_sync(inode, filp, cmd, argp);
1404 case NILFS_IOCTL_RESIZE:
1405 return nilfs_ioctl_resize(inode, filp, argp);
1406 case NILFS_IOCTL_SET_ALLOC_RANGE:
1407 return nilfs_ioctl_set_alloc_range(inode, argp);
1408 case FITRIM:
1409 return nilfs_ioctl_trim_fs(inode, argp);
1410 case FS_IOC_GETFSLABEL:
1411 return nilfs_ioctl_get_fslabel(inode->i_sb, argp);
1412 case FS_IOC_SETFSLABEL:
1413 return nilfs_ioctl_set_fslabel(inode->i_sb, filp, argp);
1414 default:
1415 return -ENOTTY;
1416 }
1417}
1418
1419#ifdef CONFIG_COMPAT
1420long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1421{
1422 switch (cmd) {
1423 case FS_IOC32_GETVERSION:
1424 cmd = FS_IOC_GETVERSION;
1425 break;
1426 case NILFS_IOCTL_CHANGE_CPMODE:
1427 case NILFS_IOCTL_DELETE_CHECKPOINT:
1428 case NILFS_IOCTL_GET_CPINFO:
1429 case NILFS_IOCTL_GET_CPSTAT:
1430 case NILFS_IOCTL_GET_SUINFO:
1431 case NILFS_IOCTL_SET_SUINFO:
1432 case NILFS_IOCTL_GET_SUSTAT:
1433 case NILFS_IOCTL_GET_VINFO:
1434 case NILFS_IOCTL_GET_BDESCS:
1435 case NILFS_IOCTL_CLEAN_SEGMENTS:
1436 case NILFS_IOCTL_SYNC:
1437 case NILFS_IOCTL_RESIZE:
1438 case NILFS_IOCTL_SET_ALLOC_RANGE:
1439 case FITRIM:
1440 case FS_IOC_GETFSLABEL:
1441 case FS_IOC_SETFSLABEL:
1442 break;
1443 default:
1444 return -ENOIOCTLCMD;
1445 }
1446 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1447}
1448#endif