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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/**
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 mutex_lock(&inode->i_mutex);
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 mutex_unlock(&inode->i_mutex);
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 if (nilfs_test_opt(nilfs, BARRIER)) {
1026 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
1027 if (ret == -EIO)
1028 return ret;
1029 }
1030
1031 if (argp != NULL) {
1032 down_read(&nilfs->ns_segctor_sem);
1033 cno = nilfs->ns_cno - 1;
1034 up_read(&nilfs->ns_segctor_sem);
1035 if (copy_to_user(argp, &cno, sizeof(cno)))
1036 return -EFAULT;
1037 }
1038 return 0;
1039}
1040
1041/**
1042 * nilfs_ioctl_resize - resize NILFS2 volume
1043 * @inode: inode object
1044 * @filp: file object
1045 * @argp: pointer on argument from userspace
1046 *
1047 * Return Value: On success, 0 is returned or error code, otherwise.
1048 */
1049static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
1050 void __user *argp)
1051{
1052 __u64 newsize;
1053 int ret = -EPERM;
1054
1055 if (!capable(CAP_SYS_ADMIN))
1056 goto out;
1057
1058 ret = mnt_want_write_file(filp);
1059 if (ret)
1060 goto out;
1061
1062 ret = -EFAULT;
1063 if (copy_from_user(&newsize, argp, sizeof(newsize)))
1064 goto out_drop_write;
1065
1066 ret = nilfs_resize_fs(inode->i_sb, newsize);
1067
1068out_drop_write:
1069 mnt_drop_write_file(filp);
1070out:
1071 return ret;
1072}
1073
1074/**
1075 * nilfs_ioctl_trim_fs() - trim ioctl handle function
1076 * @inode: inode object
1077 * @argp: pointer on argument from userspace
1078 *
1079 * Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
1080 * checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
1081 * performs the actual trim operation.
1082 *
1083 * Return Value: On success, 0 is returned or negative error code, otherwise.
1084 */
1085static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
1086{
1087 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1088 struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
1089 struct fstrim_range range;
1090 int ret;
1091
1092 if (!capable(CAP_SYS_ADMIN))
1093 return -EPERM;
1094
1095 if (!blk_queue_discard(q))
1096 return -EOPNOTSUPP;
1097
1098 if (copy_from_user(&range, argp, sizeof(range)))
1099 return -EFAULT;
1100
1101 range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
1102
1103 down_read(&nilfs->ns_segctor_sem);
1104 ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
1105 up_read(&nilfs->ns_segctor_sem);
1106
1107 if (ret < 0)
1108 return ret;
1109
1110 if (copy_to_user(argp, &range, sizeof(range)))
1111 return -EFAULT;
1112
1113 return 0;
1114}
1115
1116/**
1117 * nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
1118 * @inode: inode object
1119 * @argp: pointer on argument from userspace
1120 *
1121 * Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
1122 * of segments in bytes and upper limit of segments in bytes.
1123 * The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
1124 *
1125 * Return Value: On success, 0 is returned or error code, otherwise.
1126 */
1127static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
1128{
1129 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1130 __u64 range[2];
1131 __u64 minseg, maxseg;
1132 unsigned long segbytes;
1133 int ret = -EPERM;
1134
1135 if (!capable(CAP_SYS_ADMIN))
1136 goto out;
1137
1138 ret = -EFAULT;
1139 if (copy_from_user(range, argp, sizeof(__u64[2])))
1140 goto out;
1141
1142 ret = -ERANGE;
1143 if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
1144 goto out;
1145
1146 segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
1147
1148 minseg = range[0] + segbytes - 1;
1149 do_div(minseg, segbytes);
1150 maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
1151 do_div(maxseg, segbytes);
1152 maxseg--;
1153
1154 ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
1155out:
1156 return ret;
1157}
1158
1159/**
1160 * nilfs_ioctl_get_info - wrapping function of get metadata info
1161 * @inode: inode object
1162 * @filp: file object
1163 * @cmd: ioctl's request code
1164 * @argp: pointer on argument from userspace
1165 * @membsz: size of an item in bytes
1166 * @dofunc: concrete function of getting metadata info
1167 *
1168 * Description: nilfs_ioctl_get_info() gets metadata info by means of
1169 * calling dofunc() function.
1170 *
1171 * Return Value: On success, 0 is returned and requested metadata info
1172 * is copied into userspace. On error, one of the following
1173 * negative error codes is returned.
1174 *
1175 * %-EINVAL - Invalid arguments from userspace.
1176 *
1177 * %-ENOMEM - Insufficient amount of memory available.
1178 *
1179 * %-EFAULT - Failure during execution of requested operation.
1180 */
1181static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
1182 unsigned int cmd, void __user *argp,
1183 size_t membsz,
1184 ssize_t (*dofunc)(struct the_nilfs *,
1185 __u64 *, int,
1186 void *, size_t, size_t))
1187
1188{
1189 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1190 struct nilfs_argv argv;
1191 int ret;
1192
1193 if (copy_from_user(&argv, argp, sizeof(argv)))
1194 return -EFAULT;
1195
1196 if (argv.v_size < membsz)
1197 return -EINVAL;
1198
1199 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
1200 if (ret < 0)
1201 return ret;
1202
1203 if (copy_to_user(argp, &argv, sizeof(argv)))
1204 ret = -EFAULT;
1205 return ret;
1206}
1207
1208/**
1209 * nilfs_ioctl_set_suinfo - set segment usage info
1210 * @inode: inode object
1211 * @filp: file object
1212 * @cmd: ioctl's request code
1213 * @argp: pointer on argument from userspace
1214 *
1215 * Description: Expects an array of nilfs_suinfo_update structures
1216 * encapsulated in nilfs_argv and updates the segment usage info
1217 * according to the flags in nilfs_suinfo_update.
1218 *
1219 * Return Value: On success, 0 is returned. On error, one of the
1220 * following negative error codes is returned.
1221 *
1222 * %-EPERM - Not enough permissions
1223 *
1224 * %-EFAULT - Error copying input data
1225 *
1226 * %-EIO - I/O error.
1227 *
1228 * %-ENOMEM - Insufficient amount of memory available.
1229 *
1230 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1231 */
1232static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
1233 unsigned int cmd, void __user *argp)
1234{
1235 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1236 struct nilfs_transaction_info ti;
1237 struct nilfs_argv argv;
1238 size_t len;
1239 void __user *base;
1240 void *kbuf;
1241 int ret;
1242
1243 if (!capable(CAP_SYS_ADMIN))
1244 return -EPERM;
1245
1246 ret = mnt_want_write_file(filp);
1247 if (ret)
1248 return ret;
1249
1250 ret = -EFAULT;
1251 if (copy_from_user(&argv, argp, sizeof(argv)))
1252 goto out;
1253
1254 ret = -EINVAL;
1255 if (argv.v_size < sizeof(struct nilfs_suinfo_update))
1256 goto out;
1257
1258 if (argv.v_nmembs > nilfs->ns_nsegments)
1259 goto out;
1260
1261 if (argv.v_nmembs >= UINT_MAX / argv.v_size)
1262 goto out;
1263
1264 len = argv.v_size * argv.v_nmembs;
1265 if (!len) {
1266 ret = 0;
1267 goto out;
1268 }
1269
1270 base = (void __user *)(unsigned long)argv.v_base;
1271 kbuf = vmalloc(len);
1272 if (!kbuf) {
1273 ret = -ENOMEM;
1274 goto out;
1275 }
1276
1277 if (copy_from_user(kbuf, base, len)) {
1278 ret = -EFAULT;
1279 goto out_free;
1280 }
1281
1282 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1283 ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
1284 argv.v_nmembs);
1285 if (unlikely(ret < 0))
1286 nilfs_transaction_abort(inode->i_sb);
1287 else
1288 nilfs_transaction_commit(inode->i_sb); /* never fails */
1289
1290out_free:
1291 vfree(kbuf);
1292out:
1293 mnt_drop_write_file(filp);
1294 return ret;
1295}
1296
1297long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1298{
1299 struct inode *inode = file_inode(filp);
1300 void __user *argp = (void __user *)arg;
1301
1302 switch (cmd) {
1303 case FS_IOC_GETFLAGS:
1304 return nilfs_ioctl_getflags(inode, argp);
1305 case FS_IOC_SETFLAGS:
1306 return nilfs_ioctl_setflags(inode, filp, argp);
1307 case FS_IOC_GETVERSION:
1308 return nilfs_ioctl_getversion(inode, argp);
1309 case NILFS_IOCTL_CHANGE_CPMODE:
1310 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
1311 case NILFS_IOCTL_DELETE_CHECKPOINT:
1312 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
1313 case NILFS_IOCTL_GET_CPINFO:
1314 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1315 sizeof(struct nilfs_cpinfo),
1316 nilfs_ioctl_do_get_cpinfo);
1317 case NILFS_IOCTL_GET_CPSTAT:
1318 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
1319 case NILFS_IOCTL_GET_SUINFO:
1320 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1321 sizeof(struct nilfs_suinfo),
1322 nilfs_ioctl_do_get_suinfo);
1323 case NILFS_IOCTL_SET_SUINFO:
1324 return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
1325 case NILFS_IOCTL_GET_SUSTAT:
1326 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
1327 case NILFS_IOCTL_GET_VINFO:
1328 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
1329 sizeof(struct nilfs_vinfo),
1330 nilfs_ioctl_do_get_vinfo);
1331 case NILFS_IOCTL_GET_BDESCS:
1332 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
1333 case NILFS_IOCTL_CLEAN_SEGMENTS:
1334 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
1335 case NILFS_IOCTL_SYNC:
1336 return nilfs_ioctl_sync(inode, filp, cmd, argp);
1337 case NILFS_IOCTL_RESIZE:
1338 return nilfs_ioctl_resize(inode, filp, argp);
1339 case NILFS_IOCTL_SET_ALLOC_RANGE:
1340 return nilfs_ioctl_set_alloc_range(inode, argp);
1341 case FITRIM:
1342 return nilfs_ioctl_trim_fs(inode, argp);
1343 default:
1344 return -ENOTTY;
1345 }
1346}
1347
1348#ifdef CONFIG_COMPAT
1349long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1350{
1351 switch (cmd) {
1352 case FS_IOC32_GETFLAGS:
1353 cmd = FS_IOC_GETFLAGS;
1354 break;
1355 case FS_IOC32_SETFLAGS:
1356 cmd = FS_IOC_SETFLAGS;
1357 break;
1358 case FS_IOC32_GETVERSION:
1359 cmd = FS_IOC_GETVERSION;
1360 break;
1361 case NILFS_IOCTL_CHANGE_CPMODE:
1362 case NILFS_IOCTL_DELETE_CHECKPOINT:
1363 case NILFS_IOCTL_GET_CPINFO:
1364 case NILFS_IOCTL_GET_CPSTAT:
1365 case NILFS_IOCTL_GET_SUINFO:
1366 case NILFS_IOCTL_SET_SUINFO:
1367 case NILFS_IOCTL_GET_SUSTAT:
1368 case NILFS_IOCTL_GET_VINFO:
1369 case NILFS_IOCTL_GET_BDESCS:
1370 case NILFS_IOCTL_CLEAN_SEGMENTS:
1371 case NILFS_IOCTL_SYNC:
1372 case NILFS_IOCTL_RESIZE:
1373 case NILFS_IOCTL_SET_ALLOC_RANGE:
1374 case FITRIM:
1375 break;
1376 default:
1377 return -ENOIOCTLCMD;
1378 }
1379 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
1380}
1381#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