nilfs2: fix regression of garbage collection ioctl
[linux-2.6.git] / fs / nilfs2 / ioctl.c
1 /*
2  * ioctl.c - NILFS ioctl operations.
3  *
4  * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
19  *
20  * Written by Koji Sato <koji@osrg.net>.
21  */
22
23 #include <linux/fs.h>
24 #include <linux/wait.h>
25 #include <linux/slab.h>
26 #include <linux/capability.h>   /* capable() */
27 #include <linux/uaccess.h>      /* copy_from_user(), copy_to_user() */
28 #include <linux/vmalloc.h>
29 #include <linux/mount.h>        /* mnt_want_write(), mnt_drop_write() */
30 #include <linux/nilfs2_fs.h>
31 #include "nilfs.h"
32 #include "segment.h"
33 #include "bmap.h"
34 #include "cpfile.h"
35 #include "sufile.h"
36 #include "dat.h"
37
38
39 static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
40                                  struct nilfs_argv *argv, int dir,
41                                  ssize_t (*dofunc)(struct the_nilfs *,
42                                                    __u64 *, int,
43                                                    void *, size_t, size_t))
44 {
45         void *buf;
46         void __user *base = (void __user *)(unsigned long)argv->v_base;
47         size_t maxmembs, total, n;
48         ssize_t nr;
49         int ret, i;
50         __u64 pos, ppos;
51
52         if (argv->v_nmembs == 0)
53                 return 0;
54
55         if (argv->v_size > PAGE_SIZE)
56                 return -EINVAL;
57
58         buf = (void *)__get_free_pages(GFP_NOFS, 0);
59         if (unlikely(!buf))
60                 return -ENOMEM;
61         maxmembs = PAGE_SIZE / argv->v_size;
62
63         ret = 0;
64         total = 0;
65         pos = argv->v_index;
66         for (i = 0; i < argv->v_nmembs; i += n) {
67                 n = (argv->v_nmembs - i < maxmembs) ?
68                         argv->v_nmembs - i : maxmembs;
69                 if ((dir & _IOC_WRITE) &&
70                     copy_from_user(buf, base + argv->v_size * i,
71                                    argv->v_size * n)) {
72                         ret = -EFAULT;
73                         break;
74                 }
75                 ppos = pos;
76                 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
77                                n);
78                 if (nr < 0) {
79                         ret = nr;
80                         break;
81                 }
82                 if ((dir & _IOC_READ) &&
83                     copy_to_user(base + argv->v_size * i, buf,
84                                  argv->v_size * nr)) {
85                         ret = -EFAULT;
86                         break;
87                 }
88                 total += nr;
89                 if ((size_t)nr < n)
90                         break;
91                 if (pos == ppos)
92                         pos += n;
93         }
94         argv->v_nmembs = total;
95
96         free_pages((unsigned long)buf, 0);
97         return ret;
98 }
99
100 static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
101                                      unsigned int cmd, void __user *argp)
102 {
103         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
104         struct inode *cpfile = nilfs->ns_cpfile;
105         struct nilfs_transaction_info ti;
106         struct nilfs_cpmode cpmode;
107         int ret;
108
109         if (!capable(CAP_SYS_ADMIN))
110                 return -EPERM;
111
112         ret = mnt_want_write(filp->f_path.mnt);
113         if (ret)
114                 return ret;
115
116         ret = -EFAULT;
117         if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
118                 goto out;
119
120         down_read(&inode->i_sb->s_umount);
121
122         nilfs_transaction_begin(inode->i_sb, &ti, 0);
123         ret = nilfs_cpfile_change_cpmode(
124                 cpfile, cpmode.cm_cno, cpmode.cm_mode);
125         if (unlikely(ret < 0))
126                 nilfs_transaction_abort(inode->i_sb);
127         else
128                 nilfs_transaction_commit(inode->i_sb); /* never fails */
129
130         up_read(&inode->i_sb->s_umount);
131 out:
132         mnt_drop_write(filp->f_path.mnt);
133         return ret;
134 }
135
136 static int
137 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
138                               unsigned int cmd, void __user *argp)
139 {
140         struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
141         struct nilfs_transaction_info ti;
142         __u64 cno;
143         int ret;
144
145         if (!capable(CAP_SYS_ADMIN))
146                 return -EPERM;
147
148         ret = mnt_want_write(filp->f_path.mnt);
149         if (ret)
150                 return ret;
151
152         ret = -EFAULT;
153         if (copy_from_user(&cno, argp, sizeof(cno)))
154                 goto out;
155
156         nilfs_transaction_begin(inode->i_sb, &ti, 0);
157         ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
158         if (unlikely(ret < 0))
159                 nilfs_transaction_abort(inode->i_sb);
160         else
161                 nilfs_transaction_commit(inode->i_sb); /* never fails */
162 out:
163         mnt_drop_write(filp->f_path.mnt);
164         return ret;
165 }
166
167 static ssize_t
168 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
169                           void *buf, size_t size, size_t nmembs)
170 {
171         int ret;
172
173         down_read(&nilfs->ns_segctor_sem);
174         ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
175                                       size, nmembs);
176         up_read(&nilfs->ns_segctor_sem);
177         return ret;
178 }
179
180 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
181                                   unsigned int cmd, void __user *argp)
182 {
183         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
184         struct nilfs_cpstat cpstat;
185         int ret;
186
187         down_read(&nilfs->ns_segctor_sem);
188         ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
189         up_read(&nilfs->ns_segctor_sem);
190         if (ret < 0)
191                 return ret;
192
193         if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
194                 ret = -EFAULT;
195         return ret;
196 }
197
198 static ssize_t
199 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
200                           void *buf, size_t size, size_t nmembs)
201 {
202         int ret;
203
204         down_read(&nilfs->ns_segctor_sem);
205         ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
206                                       nmembs);
207         up_read(&nilfs->ns_segctor_sem);
208         return ret;
209 }
210
211 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
212                                   unsigned int cmd, void __user *argp)
213 {
214         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
215         struct nilfs_sustat sustat;
216         int ret;
217
218         down_read(&nilfs->ns_segctor_sem);
219         ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
220         up_read(&nilfs->ns_segctor_sem);
221         if (ret < 0)
222                 return ret;
223
224         if (copy_to_user(argp, &sustat, sizeof(sustat)))
225                 ret = -EFAULT;
226         return ret;
227 }
228
229 static ssize_t
230 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
231                          void *buf, size_t size, size_t nmembs)
232 {
233         int ret;
234
235         down_read(&nilfs->ns_segctor_sem);
236         ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs);
237         up_read(&nilfs->ns_segctor_sem);
238         return ret;
239 }
240
241 static ssize_t
242 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
243                           void *buf, size_t size, size_t nmembs)
244 {
245         struct inode *dat = nilfs_dat_inode(nilfs);
246         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
247         struct nilfs_bdesc *bdescs = buf;
248         int ret, i;
249
250         down_read(&nilfs->ns_segctor_sem);
251         for (i = 0; i < nmembs; i++) {
252                 ret = nilfs_bmap_lookup_at_level(bmap,
253                                                  bdescs[i].bd_offset,
254                                                  bdescs[i].bd_level + 1,
255                                                  &bdescs[i].bd_blocknr);
256                 if (ret < 0) {
257                         if (ret != -ENOENT) {
258                                 up_read(&nilfs->ns_segctor_sem);
259                                 return ret;
260                         }
261                         bdescs[i].bd_blocknr = 0;
262                 }
263         }
264         up_read(&nilfs->ns_segctor_sem);
265         return nmembs;
266 }
267
268 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
269                                   unsigned int cmd, void __user *argp)
270 {
271         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
272         struct nilfs_argv argv;
273         int ret;
274
275         if (copy_from_user(&argv, argp, sizeof(argv)))
276                 return -EFAULT;
277
278         if (argv.v_size != sizeof(struct nilfs_bdesc))
279                 return -EINVAL;
280
281         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
282                                     nilfs_ioctl_do_get_bdescs);
283         if (ret < 0)
284                 return ret;
285
286         if (copy_to_user(argp, &argv, sizeof(argv)))
287                 ret = -EFAULT;
288         return ret;
289 }
290
291 static int nilfs_ioctl_move_inode_block(struct inode *inode,
292                                         struct nilfs_vdesc *vdesc,
293                                         struct list_head *buffers)
294 {
295         struct buffer_head *bh;
296         int ret;
297
298         if (vdesc->vd_flags == 0)
299                 ret = nilfs_gccache_submit_read_data(
300                         inode, vdesc->vd_offset, vdesc->vd_blocknr,
301                         vdesc->vd_vblocknr, &bh);
302         else
303                 ret = nilfs_gccache_submit_read_node(
304                         inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
305
306         if (unlikely(ret < 0)) {
307                 if (ret == -ENOENT)
308                         printk(KERN_CRIT
309                                "%s: invalid virtual block address (%s): "
310                                "ino=%llu, cno=%llu, offset=%llu, "
311                                "blocknr=%llu, vblocknr=%llu\n",
312                                __func__, vdesc->vd_flags ? "node" : "data",
313                                (unsigned long long)vdesc->vd_ino,
314                                (unsigned long long)vdesc->vd_cno,
315                                (unsigned long long)vdesc->vd_offset,
316                                (unsigned long long)vdesc->vd_blocknr,
317                                (unsigned long long)vdesc->vd_vblocknr);
318                 return ret;
319         }
320         if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
321                 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
322                        "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
323                        __func__, vdesc->vd_flags ? "node" : "data",
324                        (unsigned long long)vdesc->vd_ino,
325                        (unsigned long long)vdesc->vd_cno,
326                        (unsigned long long)vdesc->vd_offset,
327                        (unsigned long long)vdesc->vd_blocknr,
328                        (unsigned long long)vdesc->vd_vblocknr);
329                 brelse(bh);
330                 return -EEXIST;
331         }
332         list_add_tail(&bh->b_assoc_buffers, buffers);
333         return 0;
334 }
335
336 static int nilfs_ioctl_move_blocks(struct super_block *sb,
337                                    struct nilfs_argv *argv, void *buf)
338 {
339         size_t nmembs = argv->v_nmembs;
340         struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
341         struct inode *inode;
342         struct nilfs_vdesc *vdesc;
343         struct buffer_head *bh, *n;
344         LIST_HEAD(buffers);
345         ino_t ino;
346         __u64 cno;
347         int i, ret;
348
349         for (i = 0, vdesc = buf; i < nmembs; ) {
350                 ino = vdesc->vd_ino;
351                 cno = vdesc->vd_cno;
352                 inode = nilfs_iget_for_gc(sb, ino, cno);
353                 if (IS_ERR(inode)) {
354                         ret = PTR_ERR(inode);
355                         goto failed;
356                 }
357                 if (list_empty(&NILFS_I(inode)->i_dirty)) {
358                         /*
359                          * Add the inode to GC inode list. Garbage Collection
360                          * is serialized and no two processes manipulate the
361                          * list simultaneously.
362                          */
363                         igrab(inode);
364                         list_add(&NILFS_I(inode)->i_dirty,
365                                  &nilfs->ns_gc_inodes);
366                 }
367
368                 do {
369                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
370                                                            &buffers);
371                         if (unlikely(ret < 0)) {
372                                 iput(inode);
373                                 goto failed;
374                         }
375                         vdesc++;
376                 } while (++i < nmembs &&
377                          vdesc->vd_ino == ino && vdesc->vd_cno == cno);
378
379                 iput(inode); /* The inode still remains in GC inode list */
380         }
381
382         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
383                 ret = nilfs_gccache_wait_and_mark_dirty(bh);
384                 if (unlikely(ret < 0)) {
385                         WARN_ON(ret == -EEXIST);
386                         goto failed;
387                 }
388                 list_del_init(&bh->b_assoc_buffers);
389                 brelse(bh);
390         }
391         return nmembs;
392
393  failed:
394         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
395                 list_del_init(&bh->b_assoc_buffers);
396                 brelse(bh);
397         }
398         return ret;
399 }
400
401 static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
402                                           struct nilfs_argv *argv, void *buf)
403 {
404         size_t nmembs = argv->v_nmembs;
405         struct inode *cpfile = nilfs->ns_cpfile;
406         struct nilfs_period *periods = buf;
407         int ret, i;
408
409         for (i = 0; i < nmembs; i++) {
410                 ret = nilfs_cpfile_delete_checkpoints(
411                         cpfile, periods[i].p_start, periods[i].p_end);
412                 if (ret < 0)
413                         return ret;
414         }
415         return nmembs;
416 }
417
418 static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
419                                       struct nilfs_argv *argv, void *buf)
420 {
421         size_t nmembs = argv->v_nmembs;
422         int ret;
423
424         ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
425
426         return (ret < 0) ? ret : nmembs;
427 }
428
429 static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
430                                          struct nilfs_argv *argv, void *buf)
431 {
432         size_t nmembs = argv->v_nmembs;
433         struct inode *dat = nilfs_dat_inode(nilfs);
434         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
435         struct nilfs_bdesc *bdescs = buf;
436         int ret, i;
437
438         for (i = 0; i < nmembs; i++) {
439                 /* XXX: use macro or inline func to check liveness */
440                 ret = nilfs_bmap_lookup_at_level(bmap,
441                                                  bdescs[i].bd_offset,
442                                                  bdescs[i].bd_level + 1,
443                                                  &bdescs[i].bd_blocknr);
444                 if (ret < 0) {
445                         if (ret != -ENOENT)
446                                 return ret;
447                         bdescs[i].bd_blocknr = 0;
448                 }
449                 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
450                         /* skip dead block */
451                         continue;
452                 if (bdescs[i].bd_level == 0) {
453                         ret = nilfs_mdt_mark_block_dirty(dat,
454                                                          bdescs[i].bd_offset);
455                         if (ret < 0) {
456                                 WARN_ON(ret == -ENOENT);
457                                 return ret;
458                         }
459                 } else {
460                         ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
461                                               bdescs[i].bd_level);
462                         if (ret < 0) {
463                                 WARN_ON(ret == -ENOENT);
464                                 return ret;
465                         }
466                 }
467         }
468         return nmembs;
469 }
470
471 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
472                                        struct nilfs_argv *argv, void **kbufs)
473 {
474         const char *msg;
475         int ret;
476
477         ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
478         if (ret < 0) {
479                 /*
480                  * can safely abort because checkpoints can be removed
481                  * independently.
482                  */
483                 msg = "cannot delete checkpoints";
484                 goto failed;
485         }
486         ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
487         if (ret < 0) {
488                 /*
489                  * can safely abort because DAT file is updated atomically
490                  * using a copy-on-write technique.
491                  */
492                 msg = "cannot delete virtual blocks from DAT file";
493                 goto failed;
494         }
495         ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
496         if (ret < 0) {
497                 /*
498                  * can safely abort because the operation is nondestructive.
499                  */
500                 msg = "cannot mark copying blocks dirty";
501                 goto failed;
502         }
503         return 0;
504
505  failed:
506         printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
507                msg, ret);
508         return ret;
509 }
510
511 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
512                                       unsigned int cmd, void __user *argp)
513 {
514         struct nilfs_argv argv[5];
515         static const size_t argsz[5] = {
516                 sizeof(struct nilfs_vdesc),
517                 sizeof(struct nilfs_period),
518                 sizeof(__u64),
519                 sizeof(struct nilfs_bdesc),
520                 sizeof(__u64),
521         };
522         void __user *base;
523         void *kbufs[5];
524         struct the_nilfs *nilfs;
525         size_t len, nsegs;
526         int n, ret;
527
528         if (!capable(CAP_SYS_ADMIN))
529                 return -EPERM;
530
531         ret = mnt_want_write(filp->f_path.mnt);
532         if (ret)
533                 return ret;
534
535         ret = -EFAULT;
536         if (copy_from_user(argv, argp, sizeof(argv)))
537                 goto out;
538
539         ret = -EINVAL;
540         nsegs = argv[4].v_nmembs;
541         if (argv[4].v_size != argsz[4])
542                 goto out;
543
544         /*
545          * argv[4] points to segment numbers this ioctl cleans.  We
546          * use kmalloc() for its buffer because memory used for the
547          * segment numbers is enough small.
548          */
549         kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
550                                nsegs * sizeof(__u64));
551         if (IS_ERR(kbufs[4])) {
552                 ret = PTR_ERR(kbufs[4]);
553                 goto out;
554         }
555         nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
556
557         for (n = 0; n < 4; n++) {
558                 ret = -EINVAL;
559                 if (argv[n].v_size != argsz[n])
560                         goto out_free;
561
562                 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
563                         goto out_free;
564
565                 len = argv[n].v_size * argv[n].v_nmembs;
566                 base = (void __user *)(unsigned long)argv[n].v_base;
567                 if (len == 0) {
568                         kbufs[n] = NULL;
569                         continue;
570                 }
571
572                 kbufs[n] = vmalloc(len);
573                 if (!kbufs[n]) {
574                         ret = -ENOMEM;
575                         goto out_free;
576                 }
577                 if (copy_from_user(kbufs[n], base, len)) {
578                         ret = -EFAULT;
579                         vfree(kbufs[n]);
580                         goto out_free;
581                 }
582         }
583
584         /*
585          * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
586          * which will operates an inode list without blocking.
587          * To protect the list from concurrent operations,
588          * nilfs_ioctl_move_blocks should be atomic operation.
589          */
590         if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
591                 ret = -EBUSY;
592                 goto out_free;
593         }
594
595         vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
596
597         ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
598         if (ret < 0)
599                 printk(KERN_ERR "NILFS: GC failed during preparation: "
600                         "cannot read source blocks: err=%d\n", ret);
601         else
602                 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
603
604         nilfs_remove_all_gcinodes(nilfs);
605         clear_nilfs_gc_running(nilfs);
606
607 out_free:
608         while (--n >= 0)
609                 vfree(kbufs[n]);
610         kfree(kbufs[4]);
611 out:
612         mnt_drop_write(filp->f_path.mnt);
613         return ret;
614 }
615
616 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
617                             unsigned int cmd, void __user *argp)
618 {
619         __u64 cno;
620         int ret;
621         struct the_nilfs *nilfs;
622
623         ret = nilfs_construct_segment(inode->i_sb);
624         if (ret < 0)
625                 return ret;
626
627         if (argp != NULL) {
628                 nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
629                 down_read(&nilfs->ns_segctor_sem);
630                 cno = nilfs->ns_cno - 1;
631                 up_read(&nilfs->ns_segctor_sem);
632                 if (copy_to_user(argp, &cno, sizeof(cno)))
633                         return -EFAULT;
634         }
635         return 0;
636 }
637
638 static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
639                                 unsigned int cmd, void __user *argp,
640                                 size_t membsz,
641                                 ssize_t (*dofunc)(struct the_nilfs *,
642                                                   __u64 *, int,
643                                                   void *, size_t, size_t))
644
645 {
646         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
647         struct nilfs_argv argv;
648         int ret;
649
650         if (copy_from_user(&argv, argp, sizeof(argv)))
651                 return -EFAULT;
652
653         if (argv.v_size < membsz)
654                 return -EINVAL;
655
656         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
657         if (ret < 0)
658                 return ret;
659
660         if (copy_to_user(argp, &argv, sizeof(argv)))
661                 ret = -EFAULT;
662         return ret;
663 }
664
665 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
666 {
667         struct inode *inode = filp->f_dentry->d_inode;
668         void __user *argp = (void __user *)arg;
669
670         switch (cmd) {
671         case NILFS_IOCTL_CHANGE_CPMODE:
672                 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
673         case NILFS_IOCTL_DELETE_CHECKPOINT:
674                 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
675         case NILFS_IOCTL_GET_CPINFO:
676                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
677                                             sizeof(struct nilfs_cpinfo),
678                                             nilfs_ioctl_do_get_cpinfo);
679         case NILFS_IOCTL_GET_CPSTAT:
680                 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
681         case NILFS_IOCTL_GET_SUINFO:
682                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
683                                             sizeof(struct nilfs_suinfo),
684                                             nilfs_ioctl_do_get_suinfo);
685         case NILFS_IOCTL_GET_SUSTAT:
686                 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
687         case NILFS_IOCTL_GET_VINFO:
688                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
689                                             sizeof(struct nilfs_vinfo),
690                                             nilfs_ioctl_do_get_vinfo);
691         case NILFS_IOCTL_GET_BDESCS:
692                 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
693         case NILFS_IOCTL_CLEAN_SEGMENTS:
694                 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
695         case NILFS_IOCTL_SYNC:
696                 return nilfs_ioctl_sync(inode, filp, cmd, argp);
697         default:
698                 return -ENOTTY;
699         }
700 }