Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad...
[zen-stable.git] / fs / nilfs2 / ioctl.c
blob41d6743d303c2a7923e5d09bc1df1fcf41514c29
1 /*
2 * ioctl.c - NILFS ioctl operations.
4 * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
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.
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.
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
20 * Written by Koji Sato <koji@osrg.net>.
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"
41 static 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))
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;
54 if (argv->v_nmembs == 0)
55 return 0;
57 if (argv->v_size > PAGE_SIZE)
58 return -EINVAL;
60 buf = (void *)__get_free_pages(GFP_NOFS, 0);
61 if (unlikely(!buf))
62 return -ENOMEM;
63 maxmembs = PAGE_SIZE / argv->v_size;
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;
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;
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;
90 total += nr;
91 if ((size_t)nr < n)
92 break;
93 if (pos == ppos)
94 pos += n;
96 argv->v_nmembs = total;
98 free_pages((unsigned long)buf, 0);
99 return ret;
102 static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
104 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
106 return put_user(flags, (int __user *)argp);
109 static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
110 void __user *argp)
112 struct nilfs_transaction_info ti;
113 unsigned int flags, oldflags;
114 int ret;
116 if (!inode_owner_or_capable(inode))
117 return -EACCES;
119 if (get_user(flags, (int __user *)argp))
120 return -EFAULT;
122 ret = mnt_want_write(filp->f_path.mnt);
123 if (ret)
124 return ret;
126 flags = nilfs_mask_flags(inode->i_mode, flags);
128 mutex_lock(&inode->i_mutex);
130 oldflags = NILFS_I(inode)->i_flags;
133 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
134 * relevant capability.
136 ret = -EPERM;
137 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
138 !capable(CAP_LINUX_IMMUTABLE))
139 goto out;
141 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
142 if (ret)
143 goto out;
145 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
146 (flags & FS_FL_USER_MODIFIABLE);
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);
153 nilfs_mark_inode_dirty(inode);
154 ret = nilfs_transaction_commit(inode->i_sb);
155 out:
156 mutex_unlock(&inode->i_mutex);
157 mnt_drop_write(filp->f_path.mnt);
158 return ret;
161 static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
163 return put_user(inode->i_generation, (int __user *)argp);
166 static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
167 unsigned int cmd, void __user *argp)
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;
174 if (!capable(CAP_SYS_ADMIN))
175 return -EPERM;
177 ret = mnt_want_write(filp->f_path.mnt);
178 if (ret)
179 return ret;
181 ret = -EFAULT;
182 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
183 goto out;
185 down_read(&inode->i_sb->s_umount);
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 */
195 up_read(&inode->i_sb->s_umount);
196 out:
197 mnt_drop_write(filp->f_path.mnt);
198 return ret;
201 static int
202 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
203 unsigned int cmd, void __user *argp)
205 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
206 struct nilfs_transaction_info ti;
207 __u64 cno;
208 int ret;
210 if (!capable(CAP_SYS_ADMIN))
211 return -EPERM;
213 ret = mnt_want_write(filp->f_path.mnt);
214 if (ret)
215 return ret;
217 ret = -EFAULT;
218 if (copy_from_user(&cno, argp, sizeof(cno)))
219 goto out;
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 */
227 out:
228 mnt_drop_write(filp->f_path.mnt);
229 return ret;
232 static ssize_t
233 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
234 void *buf, size_t size, size_t nmembs)
236 int ret;
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;
245 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
246 unsigned int cmd, void __user *argp)
248 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
249 struct nilfs_cpstat cpstat;
250 int ret;
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;
258 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
259 ret = -EFAULT;
260 return ret;
263 static ssize_t
264 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
265 void *buf, size_t size, size_t nmembs)
267 int ret;
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;
276 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
277 unsigned int cmd, void __user *argp)
279 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
280 struct nilfs_sustat sustat;
281 int ret;
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;
289 if (copy_to_user(argp, &sustat, sizeof(sustat)))
290 ret = -EFAULT;
291 return ret;
294 static ssize_t
295 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
296 void *buf, size_t size, size_t nmembs)
298 int ret;
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;
306 static ssize_t
307 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
308 void *buf, size_t size, size_t nmembs)
310 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
311 struct nilfs_bdesc *bdescs = buf;
312 int ret, i;
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;
325 bdescs[i].bd_blocknr = 0;
328 up_read(&nilfs->ns_segctor_sem);
329 return nmembs;
332 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
333 unsigned int cmd, void __user *argp)
335 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
336 struct nilfs_argv argv;
337 int ret;
339 if (copy_from_user(&argv, argp, sizeof(argv)))
340 return -EFAULT;
342 if (argv.v_size != sizeof(struct nilfs_bdesc))
343 return -EINVAL;
345 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
346 nilfs_ioctl_do_get_bdescs);
347 if (ret < 0)
348 return ret;
350 if (copy_to_user(argp, &argv, sizeof(argv)))
351 ret = -EFAULT;
352 return ret;
355 static int nilfs_ioctl_move_inode_block(struct inode *inode,
356 struct nilfs_vdesc *vdesc,
357 struct list_head *buffers)
359 struct buffer_head *bh;
360 int ret;
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);
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;
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;
396 list_add_tail(&bh->b_assoc_buffers, buffers);
397 return 0;
400 static int nilfs_ioctl_move_blocks(struct super_block *sb,
401 struct nilfs_argv *argv, void *buf)
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;
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;
421 if (list_empty(&NILFS_I(inode)->i_dirty)) {
423 * Add the inode to GC inode list. Garbage Collection
424 * is serialized and no two processes manipulate the
425 * list simultaneously.
427 igrab(inode);
428 list_add(&NILFS_I(inode)->i_dirty,
429 &nilfs->ns_gc_inodes);
432 do {
433 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
434 &buffers);
435 if (unlikely(ret < 0)) {
436 iput(inode);
437 goto failed;
439 vdesc++;
440 } while (++i < nmembs &&
441 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
443 iput(inode); /* The inode still remains in GC inode list */
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;
452 list_del_init(&bh->b_assoc_buffers);
453 brelse(bh);
455 return nmembs;
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);
462 return ret;
465 static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
466 struct nilfs_argv *argv, void *buf)
468 size_t nmembs = argv->v_nmembs;
469 struct inode *cpfile = nilfs->ns_cpfile;
470 struct nilfs_period *periods = buf;
471 int ret, i;
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;
479 return nmembs;
482 static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
483 struct nilfs_argv *argv, void *buf)
485 size_t nmembs = argv->v_nmembs;
486 int ret;
488 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
490 return (ret < 0) ? ret : nmembs;
493 static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
494 struct nilfs_argv *argv, void *buf)
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;
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;
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;
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;
531 return nmembs;
534 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
535 struct nilfs_argv *argv, void **kbufs)
537 const char *msg;
538 int ret;
540 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
541 if (ret < 0) {
543 * can safely abort because checkpoints can be removed
544 * independently.
546 msg = "cannot delete checkpoints";
547 goto failed;
549 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
550 if (ret < 0) {
552 * can safely abort because DAT file is updated atomically
553 * using a copy-on-write technique.
555 msg = "cannot delete virtual blocks from DAT file";
556 goto failed;
558 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
559 if (ret < 0) {
561 * can safely abort because the operation is nondestructive.
563 msg = "cannot mark copying blocks dirty";
564 goto failed;
566 return 0;
568 failed:
569 printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
570 msg, ret);
571 return ret;
574 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
575 unsigned int cmd, void __user *argp)
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),
585 void __user *base;
586 void *kbufs[5];
587 struct the_nilfs *nilfs;
588 size_t len, nsegs;
589 int n, ret;
591 if (!capable(CAP_SYS_ADMIN))
592 return -EPERM;
594 ret = mnt_want_write(filp->f_path.mnt);
595 if (ret)
596 return ret;
598 ret = -EFAULT;
599 if (copy_from_user(argv, argp, sizeof(argv)))
600 goto out;
602 ret = -EINVAL;
603 nsegs = argv[4].v_nmembs;
604 if (argv[4].v_size != argsz[4])
605 goto out;
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.
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;
618 nilfs = inode->i_sb->s_fs_info;
620 for (n = 0; n < 4; n++) {
621 ret = -EINVAL;
622 if (argv[n].v_size != argsz[n])
623 goto out_free;
625 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
626 goto out_free;
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;
635 kbufs[n] = vmalloc(len);
636 if (!kbufs[n]) {
637 ret = -ENOMEM;
638 goto out_free;
640 if (copy_from_user(kbufs[n], base, len)) {
641 ret = -EFAULT;
642 vfree(kbufs[n]);
643 goto out_free;
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.
653 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
654 ret = -EBUSY;
655 goto out_free;
658 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
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);
667 nilfs_remove_all_gcinodes(nilfs);
668 clear_nilfs_gc_running(nilfs);
670 out_free:
671 while (--n >= 0)
672 vfree(kbufs[n]);
673 kfree(kbufs[4]);
674 out:
675 mnt_drop_write(filp->f_path.mnt);
676 return ret;
679 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
680 unsigned int cmd, void __user *argp)
682 __u64 cno;
683 int ret;
684 struct the_nilfs *nilfs;
686 ret = nilfs_construct_segment(inode->i_sb);
687 if (ret < 0)
688 return ret;
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;
698 return 0;
701 static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
702 void __user *argp)
704 __u64 newsize;
705 int ret = -EPERM;
707 if (!capable(CAP_SYS_ADMIN))
708 goto out;
710 ret = mnt_want_write(filp->f_path.mnt);
711 if (ret)
712 goto out;
714 ret = -EFAULT;
715 if (copy_from_user(&newsize, argp, sizeof(newsize)))
716 goto out_drop_write;
718 ret = nilfs_resize_fs(inode->i_sb, newsize);
720 out_drop_write:
721 mnt_drop_write(filp->f_path.mnt);
722 out:
723 return ret;
726 static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
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;
734 if (!capable(CAP_SYS_ADMIN))
735 goto out;
737 ret = -EFAULT;
738 if (copy_from_user(range, argp, sizeof(__u64[2])))
739 goto out;
741 ret = -ERANGE;
742 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
743 goto out;
745 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
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--;
753 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
754 out:
755 return ret;
758 static 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))
766 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
767 struct nilfs_argv argv;
768 int ret;
770 if (copy_from_user(&argv, argp, sizeof(argv)))
771 return -EFAULT;
773 if (argv.v_size < membsz)
774 return -EINVAL;
776 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
777 if (ret < 0)
778 return ret;
780 if (copy_to_user(argp, &argv, sizeof(argv)))
781 ret = -EFAULT;
782 return ret;
785 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
787 struct inode *inode = filp->f_dentry->d_inode;
788 void __user *argp = (void __user *)arg;
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;
832 #ifdef CONFIG_COMPAT
833 long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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;
848 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
850 #endif