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7942b919
KS
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>
5a0e3ad6 25#include <linux/slab.h>
7942b919
KS
26#include <linux/capability.h> /* capable() */
27#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
4f6b8288 28#include <linux/vmalloc.h>
828b1c50 29#include <linux/compat.h> /* compat_ptr() */
7512487e 30#include <linux/mount.h> /* mnt_want_write(), mnt_drop_write() */
ae191838 31#include <linux/buffer_head.h>
7942b919
KS
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
7942b919
KS
41static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
42 struct nilfs_argv *argv, int dir,
43 ssize_t (*dofunc)(struct the_nilfs *,
b028fcfc 44 __u64 *, int,
7942b919
KS
45 void *, size_t, size_t))
46{
47 void *buf;
dc498d09 48 void __user *base = (void __user *)(unsigned long)argv->v_base;
3358b4aa 49 size_t maxmembs, total, n;
7942b919
KS
50 ssize_t nr;
51 int ret, i;
b028fcfc 52 __u64 pos, ppos;
7942b919
KS
53
54 if (argv->v_nmembs == 0)
55 return 0;
56
3358b4aa
RK
57 if (argv->v_size > PAGE_SIZE)
58 return -EINVAL;
59
60 buf = (void *)__get_free_pages(GFP_NOFS, 0);
61 if (unlikely(!buf))
7942b919 62 return -ENOMEM;
3358b4aa 63 maxmembs = PAGE_SIZE / argv->v_size;
7942b919
KS
64
65 ret = 0;
66 total = 0;
b028fcfc 67 pos = argv->v_index;
7942b919
KS
68 for (i = 0; i < argv->v_nmembs; i += n) {
69 n = (argv->v_nmembs - i < maxmembs) ?
70 argv->v_nmembs - i : maxmembs;
71 if ((dir & _IOC_WRITE) &&
dc498d09
RK
72 copy_from_user(buf, base + argv->v_size * i,
73 argv->v_size * n)) {
7942b919
KS
74 ret = -EFAULT;
75 break;
76 }
b028fcfc 77 ppos = pos;
8acfbf09 78 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
b028fcfc 79 n);
7942b919
KS
80 if (nr < 0) {
81 ret = nr;
82 break;
83 }
84 if ((dir & _IOC_READ) &&
dc498d09
RK
85 copy_to_user(base + argv->v_size * i, buf,
86 argv->v_size * nr)) {
7942b919
KS
87 ret = -EFAULT;
88 break;
89 }
90 total += nr;
b028fcfc
RK
91 if ((size_t)nr < n)
92 break;
93 if (pos == ppos)
94 pos += n;
7942b919
KS
95 }
96 argv->v_nmembs = total;
97
3358b4aa 98 free_pages((unsigned long)buf, 0);
7942b919
KS
99 return ret;
100}
101
cde98f0f
RK
102static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
103{
104 unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
105
106 return put_user(flags, (int __user *)argp);
107}
108
109static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
110 void __user *argp)
111{
112 struct nilfs_transaction_info ti;
113 unsigned int flags, oldflags;
114 int ret;
115
116 if (!is_owner_or_cap(inode))
117 return -EACCES;
118
119 if (get_user(flags, (int __user *)argp))
120 return -EFAULT;
121
122 ret = mnt_want_write(filp->f_path.mnt);
123 if (ret)
124 return ret;
125
126 flags = nilfs_mask_flags(inode->i_mode, flags);
127
128 mutex_lock(&inode->i_mutex);
129
130 oldflags = NILFS_I(inode)->i_flags;
131
132 /*
133 * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
134 * relevant capability.
135 */
136 ret = -EPERM;
137 if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
138 !capable(CAP_LINUX_IMMUTABLE))
139 goto out;
140
141 ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
142 if (ret)
143 goto out;
144
145 NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
146 (flags & FS_FL_USER_MODIFIABLE);
147
148 nilfs_set_inode_flags(inode);
149 inode->i_ctime = CURRENT_TIME;
150 if (IS_SYNC(inode))
151 nilfs_set_transaction_flag(NILFS_TI_SYNC);
152
153 nilfs_mark_inode_dirty(inode);
154 ret = nilfs_transaction_commit(inode->i_sb);
155out:
156 mutex_unlock(&inode->i_mutex);
157 mnt_drop_write(filp->f_path.mnt);
158 return ret;
159}
160
161static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
162{
163 return put_user(inode->i_generation, (int __user *)argp);
164}
165
7942b919
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166static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
167 unsigned int cmd, void __user *argp)
168{
e3154e97 169 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
7942b919
KS
170 struct nilfs_transaction_info ti;
171 struct nilfs_cpmode cpmode;
172 int ret;
173
174 if (!capable(CAP_SYS_ADMIN))
175 return -EPERM;
7512487e
RK
176
177 ret = mnt_want_write(filp->f_path.mnt);
178 if (ret)
179 return ret;
180
181 ret = -EFAULT;
7942b919 182 if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
7512487e 183 goto out;
7942b919 184
348fe8da 185 down_read(&inode->i_sb->s_umount);
7512487e 186
7942b919
KS
187 nilfs_transaction_begin(inode->i_sb, &ti, 0);
188 ret = nilfs_cpfile_change_cpmode(
e3154e97 189 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
7512487e 190 if (unlikely(ret < 0))
47420c79 191 nilfs_transaction_abort(inode->i_sb);
7512487e
RK
192 else
193 nilfs_transaction_commit(inode->i_sb); /* never fails */
194
348fe8da 195 up_read(&inode->i_sb->s_umount);
7512487e
RK
196out:
197 mnt_drop_write(filp->f_path.mnt);
7942b919
KS
198 return ret;
199}
200
201static int
202nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
203 unsigned int cmd, void __user *argp)
204{
e3154e97 205 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
7942b919
KS
206 struct nilfs_transaction_info ti;
207 __u64 cno;
208 int ret;
209
210 if (!capable(CAP_SYS_ADMIN))
211 return -EPERM;
7512487e
RK
212
213 ret = mnt_want_write(filp->f_path.mnt);
214 if (ret)
215 return ret;
216
217 ret = -EFAULT;
7942b919 218 if (copy_from_user(&cno, argp, sizeof(cno)))
7512487e 219 goto out;
7942b919
KS
220
221 nilfs_transaction_begin(inode->i_sb, &ti, 0);
e3154e97 222 ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
7512487e 223 if (unlikely(ret < 0))
47420c79 224 nilfs_transaction_abort(inode->i_sb);
7512487e
RK
225 else
226 nilfs_transaction_commit(inode->i_sb); /* never fails */
227out:
228 mnt_drop_write(filp->f_path.mnt);
7942b919
KS
229 return ret;
230}
231
232static ssize_t
b028fcfc 233nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
7942b919
KS
234 void *buf, size_t size, size_t nmembs)
235{
7942b919
KS
236 int ret;
237
47420c79 238 down_read(&nilfs->ns_segctor_sem);
47eb6b9c 239 ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
003ff182 240 size, nmembs);
47420c79 241 up_read(&nilfs->ns_segctor_sem);
7942b919
KS
242 return ret;
243}
244
245static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
246 unsigned int cmd, void __user *argp)
247{
e3154e97 248 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
7942b919 249 struct nilfs_cpstat cpstat;
7942b919
KS
250 int ret;
251
47420c79
RK
252 down_read(&nilfs->ns_segctor_sem);
253 ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
254 up_read(&nilfs->ns_segctor_sem);
7942b919
KS
255 if (ret < 0)
256 return ret;
257
258 if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
259 ret = -EFAULT;
260 return ret;
261}
262
263static ssize_t
b028fcfc 264nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
7942b919
KS
265 void *buf, size_t size, size_t nmembs)
266{
7942b919
KS
267 int ret;
268
47420c79 269 down_read(&nilfs->ns_segctor_sem);
003ff182
RK
270 ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
271 nmembs);
47420c79 272 up_read(&nilfs->ns_segctor_sem);
7942b919
KS
273 return ret;
274}
275
276static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
277 unsigned int cmd, void __user *argp)
278{
e3154e97 279 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
7942b919 280 struct nilfs_sustat sustat;
7942b919
KS
281 int ret;
282
47420c79
RK
283 down_read(&nilfs->ns_segctor_sem);
284 ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
285 up_read(&nilfs->ns_segctor_sem);
7942b919
KS
286 if (ret < 0)
287 return ret;
288
289 if (copy_to_user(argp, &sustat, sizeof(sustat)))
290 ret = -EFAULT;
291 return ret;
292}
293
294static ssize_t
b028fcfc 295nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
7942b919
KS
296 void *buf, size_t size, size_t nmembs)
297{
7942b919
KS
298 int ret;
299
47420c79 300 down_read(&nilfs->ns_segctor_sem);
365e215c 301 ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
47420c79 302 up_read(&nilfs->ns_segctor_sem);
7942b919
KS
303 return ret;
304}
305
306static ssize_t
b028fcfc 307nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
7942b919
KS
308 void *buf, size_t size, size_t nmembs)
309{
365e215c 310 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
7942b919
KS
311 struct nilfs_bdesc *bdescs = buf;
312 int ret, i;
313
47eb6b9c 314 down_read(&nilfs->ns_segctor_sem);
7942b919
KS
315 for (i = 0; i < nmembs; i++) {
316 ret = nilfs_bmap_lookup_at_level(bmap,
317 bdescs[i].bd_offset,
318 bdescs[i].bd_level + 1,
319 &bdescs[i].bd_blocknr);
320 if (ret < 0) {
47eb6b9c
RK
321 if (ret != -ENOENT) {
322 up_read(&nilfs->ns_segctor_sem);
7942b919 323 return ret;
47eb6b9c 324 }
7942b919
KS
325 bdescs[i].bd_blocknr = 0;
326 }
327 }
47eb6b9c 328 up_read(&nilfs->ns_segctor_sem);
7942b919
KS
329 return nmembs;
330}
331
332static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
333 unsigned int cmd, void __user *argp)
334{
e3154e97 335 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
7942b919 336 struct nilfs_argv argv;
7942b919
KS
337 int ret;
338
339 if (copy_from_user(&argv, argp, sizeof(argv)))
340 return -EFAULT;
341
83aca8f4
RK
342 if (argv.v_size != sizeof(struct nilfs_bdesc))
343 return -EINVAL;
344
7942b919
KS
345 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
346 nilfs_ioctl_do_get_bdescs);
47420c79
RK
347 if (ret < 0)
348 return ret;
7942b919
KS
349
350 if (copy_to_user(argp, &argv, sizeof(argv)))
351 ret = -EFAULT;
352 return ret;
353}
354
355static int nilfs_ioctl_move_inode_block(struct inode *inode,
356 struct nilfs_vdesc *vdesc,
357 struct list_head *buffers)
358{
359 struct buffer_head *bh;
360 int ret;
361
362 if (vdesc->vd_flags == 0)
363 ret = nilfs_gccache_submit_read_data(
364 inode, vdesc->vd_offset, vdesc->vd_blocknr,
365 vdesc->vd_vblocknr, &bh);
366 else
367 ret = nilfs_gccache_submit_read_node(
368 inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
369
370 if (unlikely(ret < 0)) {
371 if (ret == -ENOENT)
372 printk(KERN_CRIT
373 "%s: invalid virtual block address (%s): "
374 "ino=%llu, cno=%llu, offset=%llu, "
375 "blocknr=%llu, vblocknr=%llu\n",
376 __func__, vdesc->vd_flags ? "node" : "data",
377 (unsigned long long)vdesc->vd_ino,
378 (unsigned long long)vdesc->vd_cno,
379 (unsigned long long)vdesc->vd_offset,
380 (unsigned long long)vdesc->vd_blocknr,
381 (unsigned long long)vdesc->vd_vblocknr);
382 return ret;
383 }
5399dd1f
RK
384 if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
385 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
386 "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
387 __func__, vdesc->vd_flags ? "node" : "data",
388 (unsigned long long)vdesc->vd_ino,
389 (unsigned long long)vdesc->vd_cno,
390 (unsigned long long)vdesc->vd_offset,
391 (unsigned long long)vdesc->vd_blocknr,
392 (unsigned long long)vdesc->vd_vblocknr);
393 brelse(bh);
394 return -EEXIST;
395 }
7942b919
KS
396 list_add_tail(&bh->b_assoc_buffers, buffers);
397 return 0;
398}
399
263d90ce 400static int nilfs_ioctl_move_blocks(struct super_block *sb,
4f6b8288 401 struct nilfs_argv *argv, void *buf)
7942b919 402{
4f6b8288 403 size_t nmembs = argv->v_nmembs;
e3154e97 404 struct the_nilfs *nilfs = sb->s_fs_info;
7942b919
KS
405 struct inode *inode;
406 struct nilfs_vdesc *vdesc;
407 struct buffer_head *bh, *n;
408 LIST_HEAD(buffers);
409 ino_t ino;
410 __u64 cno;
411 int i, ret;
412
413 for (i = 0, vdesc = buf; i < nmembs; ) {
414 ino = vdesc->vd_ino;
415 cno = vdesc->vd_cno;
263d90ce 416 inode = nilfs_iget_for_gc(sb, ino, cno);
103cfcf5
DC
417 if (IS_ERR(inode)) {
418 ret = PTR_ERR(inode);
7942b919
KS
419 goto failed;
420 }
947b10ae
RK
421 if (list_empty(&NILFS_I(inode)->i_dirty)) {
422 /*
423 * Add the inode to GC inode list. Garbage Collection
424 * is serialized and no two processes manipulate the
425 * list simultaneously.
426 */
427 igrab(inode);
428 list_add(&NILFS_I(inode)->i_dirty,
429 &nilfs->ns_gc_inodes);
430 }
431
7942b919
KS
432 do {
433 ret = nilfs_ioctl_move_inode_block(inode, vdesc,
434 &buffers);
263d90ce
RK
435 if (unlikely(ret < 0)) {
436 iput(inode);
7942b919 437 goto failed;
263d90ce 438 }
7942b919
KS
439 vdesc++;
440 } while (++i < nmembs &&
441 vdesc->vd_ino == ino && vdesc->vd_cno == cno);
263d90ce
RK
442
443 iput(inode); /* The inode still remains in GC inode list */
7942b919
KS
444 }
445
446 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
447 ret = nilfs_gccache_wait_and_mark_dirty(bh);
448 if (unlikely(ret < 0)) {
5399dd1f 449 WARN_ON(ret == -EEXIST);
7942b919
KS
450 goto failed;
451 }
452 list_del_init(&bh->b_assoc_buffers);
7942b919
KS
453 brelse(bh);
454 }
455 return nmembs;
456
457 failed:
458 list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
459 list_del_init(&bh->b_assoc_buffers);
7942b919
KS
460 brelse(bh);
461 }
462 return ret;
463}
464
4f6b8288
RK
465static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
466 struct nilfs_argv *argv, void *buf)
7942b919 467{
4f6b8288 468 size_t nmembs = argv->v_nmembs;
7942b919
KS
469 struct inode *cpfile = nilfs->ns_cpfile;
470 struct nilfs_period *periods = buf;
471 int ret, i;
472
473 for (i = 0; i < nmembs; i++) {
474 ret = nilfs_cpfile_delete_checkpoints(
475 cpfile, periods[i].p_start, periods[i].p_end);
476 if (ret < 0)
477 return ret;
478 }
479 return nmembs;
480}
481
4f6b8288
RK
482static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
483 struct nilfs_argv *argv, void *buf)
7942b919 484{
4f6b8288
RK
485 size_t nmembs = argv->v_nmembs;
486 int ret;
7942b919 487
365e215c 488 ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
7942b919
KS
489
490 return (ret < 0) ? ret : nmembs;
491}
492
4f6b8288
RK
493static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
494 struct nilfs_argv *argv, void *buf)
7942b919 495{
4f6b8288 496 size_t nmembs = argv->v_nmembs;
365e215c 497 struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
7942b919
KS
498 struct nilfs_bdesc *bdescs = buf;
499 int ret, i;
500
501 for (i = 0; i < nmembs; i++) {
502 /* XXX: use macro or inline func to check liveness */
503 ret = nilfs_bmap_lookup_at_level(bmap,
504 bdescs[i].bd_offset,
505 bdescs[i].bd_level + 1,
506 &bdescs[i].bd_blocknr);
507 if (ret < 0) {
508 if (ret != -ENOENT)
509 return ret;
510 bdescs[i].bd_blocknr = 0;
511 }
512 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
513 /* skip dead block */
514 continue;
515 if (bdescs[i].bd_level == 0) {
365e215c 516 ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
7942b919
KS
517 bdescs[i].bd_offset);
518 if (ret < 0) {
1f5abe7e 519 WARN_ON(ret == -ENOENT);
7942b919
KS
520 return ret;
521 }
522 } else {
523 ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
524 bdescs[i].bd_level);
525 if (ret < 0) {
1f5abe7e 526 WARN_ON(ret == -ENOENT);
7942b919
KS
527 return ret;
528 }
529 }
530 }
531 return nmembs;
532}
533
7942b919 534int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
4f6b8288 535 struct nilfs_argv *argv, void **kbufs)
7942b919 536{
1f5abe7e 537 const char *msg;
4f6b8288 538 int ret;
7942b919 539
4f6b8288 540 ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
1f5abe7e
RK
541 if (ret < 0) {
542 /*
543 * can safely abort because checkpoints can be removed
544 * independently.
545 */
546 msg = "cannot delete checkpoints";
547 goto failed;
548 }
4f6b8288 549 ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
1f5abe7e
RK
550 if (ret < 0) {
551 /*
552 * can safely abort because DAT file is updated atomically
553 * using a copy-on-write technique.
554 */
555 msg = "cannot delete virtual blocks from DAT file";
556 goto failed;
557 }
4f6b8288 558 ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
1f5abe7e
RK
559 if (ret < 0) {
560 /*
561 * can safely abort because the operation is nondestructive.
562 */
563 msg = "cannot mark copying blocks dirty";
564 goto failed;
565 }
7942b919
KS
566 return 0;
567
1f5abe7e 568 failed:
1f5abe7e
RK
569 printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
570 msg, ret);
7942b919
KS
571 return ret;
572}
573
574static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
575 unsigned int cmd, void __user *argp)
576{
4f6b8288 577 struct nilfs_argv argv[5];
33e189bd 578 static const size_t argsz[5] = {
4f6b8288
RK
579 sizeof(struct nilfs_vdesc),
580 sizeof(struct nilfs_period),
581 sizeof(__u64),
582 sizeof(struct nilfs_bdesc),
583 sizeof(__u64),
584 };
585 void __user *base;
586 void *kbufs[5];
587 struct the_nilfs *nilfs;
588 size_t len, nsegs;
589 int n, ret;
590
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591 if (!capable(CAP_SYS_ADMIN))
592 return -EPERM;
4f6b8288 593
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594 ret = mnt_want_write(filp->f_path.mnt);
595 if (ret)
596 return ret;
597
598 ret = -EFAULT;
4f6b8288 599 if (copy_from_user(argv, argp, sizeof(argv)))
7512487e 600 goto out;
4f6b8288 601
7512487e 602 ret = -EINVAL;
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603 nsegs = argv[4].v_nmembs;
604 if (argv[4].v_size != argsz[4])
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605 goto out;
606
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607 /*
608 * argv[4] points to segment numbers this ioctl cleans. We
609 * use kmalloc() for its buffer because memory used for the
610 * segment numbers is enough small.
611 */
612 kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
613 nsegs * sizeof(__u64));
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614 if (IS_ERR(kbufs[4])) {
615 ret = PTR_ERR(kbufs[4]);
616 goto out;
617 }
e3154e97 618 nilfs = inode->i_sb->s_fs_info;
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619
620 for (n = 0; n < 4; n++) {
621 ret = -EINVAL;
622 if (argv[n].v_size != argsz[n])
623 goto out_free;
624
625 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
626 goto out_free;
627
628 len = argv[n].v_size * argv[n].v_nmembs;
629 base = (void __user *)(unsigned long)argv[n].v_base;
630 if (len == 0) {
631 kbufs[n] = NULL;
632 continue;
633 }
634
635 kbufs[n] = vmalloc(len);
636 if (!kbufs[n]) {
637 ret = -ENOMEM;
638 goto out_free;
639 }
640 if (copy_from_user(kbufs[n], base, len)) {
641 ret = -EFAULT;
642 vfree(kbufs[n]);
643 goto out_free;
644 }
645 }
646
1cf58fa8 647 /*
263d90ce 648 * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
1cf58fa8
JS
649 * which will operates an inode list without blocking.
650 * To protect the list from concurrent operations,
651 * nilfs_ioctl_move_blocks should be atomic operation.
652 */
653 if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
654 ret = -EBUSY;
655 goto out_free;
656 }
657
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658 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
659
263d90ce 660 ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
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661 if (ret < 0)
662 printk(KERN_ERR "NILFS: GC failed during preparation: "
663 "cannot read source blocks: err=%d\n", ret);
664 else
665 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
666
263d90ce 667 nilfs_remove_all_gcinodes(nilfs);
1cf58fa8 668 clear_nilfs_gc_running(nilfs);
4f6b8288 669
7512487e 670out_free:
d5046853 671 while (--n >= 0)
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672 vfree(kbufs[n]);
673 kfree(kbufs[4]);
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674out:
675 mnt_drop_write(filp->f_path.mnt);
4f6b8288 676 return ret;
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677}
678
679static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
680 unsigned int cmd, void __user *argp)
681{
682 __u64 cno;
683 int ret;
0d561f12 684 struct the_nilfs *nilfs;
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685
686 ret = nilfs_construct_segment(inode->i_sb);
687 if (ret < 0)
688 return ret;
689
690 if (argp != NULL) {
e3154e97 691 nilfs = inode->i_sb->s_fs_info;
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692 down_read(&nilfs->ns_segctor_sem);
693 cno = nilfs->ns_cno - 1;
694 up_read(&nilfs->ns_segctor_sem);
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695 if (copy_to_user(argp, &cno, sizeof(cno)))
696 return -EFAULT;
697 }
698 return 0;
699}
700
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701static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
702 unsigned int cmd, void __user *argp,
83aca8f4 703 size_t membsz,
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RK
704 ssize_t (*dofunc)(struct the_nilfs *,
705 __u64 *, int,
706 void *, size_t, size_t))
707
708{
e3154e97 709 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
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710 struct nilfs_argv argv;
711 int ret;
712
713 if (copy_from_user(&argv, argp, sizeof(argv)))
714 return -EFAULT;
715
003ff182 716 if (argv.v_size < membsz)
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717 return -EINVAL;
718
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719 ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
720 if (ret < 0)
721 return ret;
722
723 if (copy_to_user(argp, &argv, sizeof(argv)))
724 ret = -EFAULT;
725 return ret;
726}
727
7a946193 728long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
7942b919 729{
7a946193 730 struct inode *inode = filp->f_dentry->d_inode;
75323400 731 void __user *argp = (void __user *)arg;
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732
733 switch (cmd) {
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734 case FS_IOC_GETFLAGS:
735 return nilfs_ioctl_getflags(inode, argp);
736 case FS_IOC_SETFLAGS:
737 return nilfs_ioctl_setflags(inode, filp, argp);
738 case FS_IOC_GETVERSION:
739 return nilfs_ioctl_getversion(inode, argp);
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740 case NILFS_IOCTL_CHANGE_CPMODE:
741 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
742 case NILFS_IOCTL_DELETE_CHECKPOINT:
743 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
744 case NILFS_IOCTL_GET_CPINFO:
47eb6b9c 745 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4 746 sizeof(struct nilfs_cpinfo),
47eb6b9c 747 nilfs_ioctl_do_get_cpinfo);
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748 case NILFS_IOCTL_GET_CPSTAT:
749 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
750 case NILFS_IOCTL_GET_SUINFO:
47eb6b9c 751 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4 752 sizeof(struct nilfs_suinfo),
47eb6b9c 753 nilfs_ioctl_do_get_suinfo);
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754 case NILFS_IOCTL_GET_SUSTAT:
755 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
756 case NILFS_IOCTL_GET_VINFO:
47eb6b9c 757 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
83aca8f4 758 sizeof(struct nilfs_vinfo),
47eb6b9c 759 nilfs_ioctl_do_get_vinfo);
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760 case NILFS_IOCTL_GET_BDESCS:
761 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
762 case NILFS_IOCTL_CLEAN_SEGMENTS:
763 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
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764 case NILFS_IOCTL_SYNC:
765 return nilfs_ioctl_sync(inode, filp, cmd, argp);
766 default:
767 return -ENOTTY;
768 }
769}
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RK
770
771#ifdef CONFIG_COMPAT
772long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
773{
774 switch (cmd) {
775 case FS_IOC32_GETFLAGS:
776 cmd = FS_IOC_GETFLAGS;
777 break;
778 case FS_IOC32_SETFLAGS:
779 cmd = FS_IOC_SETFLAGS;
780 break;
781 case FS_IOC32_GETVERSION:
782 cmd = FS_IOC_GETVERSION;
783 break;
784 default:
785 return -ENOIOCTLCMD;
786 }
787 return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
788}
789#endif