SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
 301                 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
 302                        "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
 303                        __func__, vdesc->vd_flags ? "node" : "data",
 304                        (unsigned long long)vdesc->vd_ino,
 305                        (unsigned long long)vdesc->vd_cno,
 306                        (unsigned long long)vdesc->vd_offset,
 307                        (unsigned long long)vdesc->vd_blocknr,
 308                        (unsigned long long)vdesc->vd_vblocknr);
 309                 brelse(bh);
 310                 return -EEXIST;
 311         }
 312         list_add_tail(&bh->b_assoc_buffers, buffers);
 313         return 0;
 314 }
 315
 316 static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
 317                                    struct nilfs_argv *argv, void *buf)
 318 {
 319         size_t nmembs = argv->v_nmembs;
 320         struct inode *inode;
 321         struct nilfs_vdesc *vdesc;
 322         struct buffer_head *bh, *n;
 323         LIST_HEAD(buffers);
 324         ino_t ino;
 325         __u64 cno;
 326         int i, ret;
 327
 328         for (i = 0, vdesc = buf; i < nmembs; ) {
 329                 ino = vdesc->vd_ino;
 330                 cno = vdesc->vd_cno;
 331                 inode = nilfs_gc_iget(nilfs, ino, cno);
 332                 if (unlikely(inode == NULL)) {
 333                         ret = -ENOMEM;
 334                         goto failed;
 335                 }
 336                 do {
 337                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
 338                                                            &buffers);
 339                         if (unlikely(ret < 0))
 340                                 goto failed;
 341                         vdesc++;
 342                 } while (++i < nmembs &&
 343                          vdesc->vd_ino == ino && vdesc->vd_cno == cno);
 344         }
 345
 346         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 347                 ret = nilfs_gccache_wait_and_mark_dirty(bh);
 348                 if (unlikely(ret < 0)) {
 349                         WARN_ON(ret == -EEXIST);
 350                         goto failed;
 351                 }
 352                 list_del_init(&bh->b_assoc_buffers);
 353                 brelse(bh);
 354         }
 355         return nmembs;
 356
 357  failed:
 358         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 359                 list_del_init(&bh->b_assoc_buffers);
 360                 brelse(bh);
 361         }
 362         return ret;
 363 }
 364
 365 static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
 366                                           struct nilfs_argv *argv, void *buf)
 367 {
 368         size_t nmembs = argv->v_nmembs;
 369         struct inode *cpfile = nilfs->ns_cpfile;
 370         struct nilfs_period *periods = buf;
 371         int ret, i;
 372
 373         for (i = 0; i < nmembs; i++) {
 374                 ret = nilfs_cpfile_delete_checkpoints(
 375                         cpfile, periods[i].p_start, periods[i].p_end);
 376                 if (ret < 0)
 377                         return ret;
 378         }
 379         return nmembs;
 380 }
 381
 382 static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
 383                                       struct nilfs_argv *argv, void *buf)
 384 {
 385         size_t nmembs = argv->v_nmembs;
 386         int ret;
 387
 388         ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
 389
 390         return (ret < 0) ? ret : nmembs;
 391 }
 392
 393 static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 394                                          struct nilfs_argv *argv, void *buf)
 395 {
 396         size_t nmembs = argv->v_nmembs;
 397         struct inode *dat = nilfs_dat_inode(nilfs);
 398         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
 399         struct nilfs_bdesc *bdescs = buf;
 400         int ret, i;
 401
 402         for (i = 0; i < nmembs; i++) {
 403                 /* XXX: use macro or inline func to check liveness */
 404                 ret = nilfs_bmap_lookup_at_level(bmap,
 405                                                  bdescs[i].bd_offset,
 406                                                  bdescs[i].bd_level + 1,
 407                                                  &bdescs[i].bd_blocknr);
 408                 if (ret < 0) {
 409                         if (ret != -ENOENT)
 410                                 return ret;
 411                         bdescs[i].bd_blocknr = 0;
 412                 }
 413                 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
 414                         /* skip dead block */
 415                         continue;
 416                 if (bdescs[i].bd_level == 0) {
 417                         ret = nilfs_mdt_mark_block_dirty(dat,
 418                                                          bdescs[i].bd_offset);
 419                         if (ret < 0) {
 420                                 WARN_ON(ret == -ENOENT);
 421                                 return ret;
 422                         }
 423                 } else {
 424                         ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
 425                                               bdescs[i].bd_level);
 426                         if (ret < 0) {
 427                                 WARN_ON(ret == -ENOENT);
 428                                 return ret;
 429                         }
 430                 }
 431         }
 432         return nmembs;
 433 }
 434
 435 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
 436                                        struct nilfs_argv *argv, void **kbufs)
 437 {
 438         const char *msg;
 439         int ret;
 440
 441         ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
 442         if (ret < 0) {
 443                 /*
 444                  * can safely abort because checkpoints can be removed
 445                  * independently.
 446                  */
 447                 msg = "cannot delete checkpoints";
 448                 goto failed;
 449         }
 450         ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
 451         if (ret < 0) {
 452                 /*
 453                  * can safely abort because DAT file is updated atomically
 454                  * using a copy-on-write technique.
 455                  */
 456                 msg = "cannot delete virtual blocks from DAT file";
 457                 goto failed;
 458         }
 459         ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
 460         if (ret < 0) {
 461                 /*
 462                  * can safely abort because the operation is nondestructive.
 463                  */
 464                 msg = "cannot mark copying blocks dirty";
 465                 goto failed;
 466         }
 467         return 0;
 468
 469  failed:
 470         printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
 471                msg, ret);
 472         return ret;
 473 }
 474
 475 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
 476                                       unsigned int cmd, void __user *argp)
 477 {
 478         struct nilfs_argv argv[5];
 479         const static size_t argsz[5] = {
 480                 sizeof(struct nilfs_vdesc),
 481                 sizeof(struct nilfs_period),
 482                 sizeof(__u64),
 483                 sizeof(struct nilfs_bdesc),
 484                 sizeof(__u64),
 485         };
 486         void __user *base;
 487         void *kbufs[5];
 488         struct the_nilfs *nilfs;
 489         size_t len, nsegs;
 490         int n, ret;
 491
 492         if (!capable(CAP_SYS_ADMIN))
 493                 return -EPERM;
 494
 495         if (copy_from_user(argv, argp, sizeof(argv)))
 496                 return -EFAULT;
 497
 498         nsegs = argv[4].v_nmembs;
 499         if (argv[4].v_size != argsz[4])
 500                 return -EINVAL;
 501         /*
 502          * argv[4] points to segment numbers this ioctl cleans.  We
 503          * use kmalloc() for its buffer because memory used for the
 504          * segment numbers is enough small.
 505          */
 506         kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
 507                                nsegs * sizeof(__u64));
 508         if (IS_ERR(kbufs[4]))
 509                 return PTR_ERR(kbufs[4]);
 510
 511         nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 512
 513         for (n = 0; n < 4; n++) {
 514                 ret = -EINVAL;
 515                 if (argv[n].v_size != argsz[n])
 516                         goto out_free;
 517
 518                 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
 519                         goto out_free;
 520
 521                 len = argv[n].v_size * argv[n].v_nmembs;
 522                 base = (void __user *)(unsigned long)argv[n].v_base;
 523                 if (len == 0) {
 524                         kbufs[n] = NULL;
 525                         continue;
 526                 }
 527
 528                 kbufs[n] = vmalloc(len);
 529                 if (!kbufs[n]) {
 530                         ret = -ENOMEM;
 531                         goto out_free;
 532                 }
 533                 if (copy_from_user(kbufs[n], base, len)) {
 534                         ret = -EFAULT;
 535                         vfree(kbufs[n]);
 536                         goto out_free;
 537                 }
 538         }
 539
 540         /*
 541          * nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
 542          * which will operates an inode list without blocking.
 543          * To protect the list from concurrent operations,
 544          * nilfs_ioctl_move_blocks should be atomic operation.
 545          */
 546         if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
 547                 ret = -EBUSY;
 548                 goto out_free;
 549         }
 550
 551         ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
 552         if (ret < 0)
 553                 printk(KERN_ERR "NILFS: GC failed during preparation: "
 554                         "cannot read source blocks: err=%d\n", ret);
 555         else
 556                 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
 557
 558         if (ret < 0)
 559                 nilfs_remove_all_gcinode(nilfs);
 560         clear_nilfs_gc_running(nilfs);
 561
 562  out_free:
 563         while (--n >= 0)
 564                 vfree(kbufs[n]);
 565         kfree(kbufs[4]);
 566         return ret;
 567 }
 568
 569 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
 570                             unsigned int cmd, void __user *argp)
 571 {
 572         __u64 cno;
 573         int ret;
 574
 575         ret = nilfs_construct_segment(inode->i_sb);
 576         if (ret < 0)
 577                 return ret;
 578
 579         if (argp != NULL) {
 580                 cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
 581                 if (copy_to_user(argp, &cno, sizeof(cno)))
 582                         return -EFAULT;
 583         }
 584         return 0;
 585 }
 586
 587 static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
 588                                 unsigned int cmd, void __user *argp,
 589                                 size_t membsz,
 590                                 ssize_t (*dofunc)(struct the_nilfs *,
 591                                                   __u64 *, int,
 592                                                   void *, size_t, size_t))
 593
 594 {
 595         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 596         struct nilfs_argv argv;
 597         int ret;
 598
 599         if (copy_from_user(&argv, argp, sizeof(argv)))
 600                 return -EFAULT;
 601
 602         if (argv.v_size < membsz)
 603                 return -EINVAL;
 604
 605         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
 606         if (ret < 0)
 607                 return ret;
 608
 609         if (copy_to_user(argp, &argv, sizeof(argv)))
 610                 ret = -EFAULT;
 611         return ret;
 612 }
 613
 614 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 615 {
 616         struct inode *inode = filp->f_dentry->d_inode;
 617         void __user *argp = (void * __user *)arg;
 618
 619         switch (cmd) {
 620         case NILFS_IOCTL_CHANGE_CPMODE:
 621                 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
 622         case NILFS_IOCTL_DELETE_CHECKPOINT:
 623                 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
 624         case NILFS_IOCTL_GET_CPINFO:
 625                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 626                                             sizeof(struct nilfs_cpinfo),
 627                                             nilfs_ioctl_do_get_cpinfo);
 628         case NILFS_IOCTL_GET_CPSTAT:
 629                 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
 630         case NILFS_IOCTL_GET_SUINFO:
 631                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 632                                             sizeof(struct nilfs_suinfo),
 633                                             nilfs_ioctl_do_get_suinfo);
 634         case NILFS_IOCTL_GET_SUSTAT:
 635                 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
 636         case NILFS_IOCTL_GET_VINFO:
 637                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 638                                             sizeof(struct nilfs_vinfo),
 639                                             nilfs_ioctl_do_get_vinfo);
 640         case NILFS_IOCTL_GET_BDESCS:
 641                 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
 642         case NILFS_IOCTL_CLEAN_SEGMENTS:
 643                 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
 644         case NILFS_IOCTL_SYNC:
 645                 return nilfs_ioctl_sync(inode, filp, cmd, argp);
 646         default:
 647                 return -ENOTTY;
 648         }
 649 }