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