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