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/nilfs2_fs.h>
  29 #include "nilfs.h"
  30 #include "segment.h"
  31 #include "bmap.h"
  32 #include "cpfile.h"
  33 #include "sufile.h"
  34 #include "dat.h"
  35
  36
  37 static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
  38                                  struct nilfs_argv *argv, int dir,
  39                                  ssize_t (*dofunc)(struct the_nilfs *,
  40                                                    __u64 *, int,
  41                                                    void *, size_t, size_t))
  42 {
  43         void *buf;
  44         void __user *base = (void __user *)(unsigned long)argv->v_base;
  45         size_t maxmembs, total, n;
  46         ssize_t nr;
  47         int ret, i;
  48         __u64 pos, ppos;
  49
  50         if (argv->v_nmembs == 0)
  51                 return 0;
  52
  53         if (argv->v_size > PAGE_SIZE)
  54                 return -EINVAL;
  55
  56         buf = (void *)__get_free_pages(GFP_NOFS, 0);
  57         if (unlikely(!buf))
  58                 return -ENOMEM;
  59         maxmembs = PAGE_SIZE / argv->v_size;
  60
  61         ret = 0;
  62         total = 0;
  63         pos = argv->v_index;
  64         for (i = 0; i < argv->v_nmembs; i += n) {
  65                 n = (argv->v_nmembs - i < maxmembs) ?
  66                         argv->v_nmembs - i : maxmembs;
  67                 if ((dir & _IOC_WRITE) &&
  68                     copy_from_user(buf, base + argv->v_size * i,
  69                                    argv->v_size * n)) {
  70                         ret = -EFAULT;
  71                         break;
  72                 }
  73                 ppos = pos;
  74                 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
  75                                n);
  76                 if (nr < 0) {
  77                         ret = nr;
  78                         break;
  79                 }
  80                 if ((dir & _IOC_READ) &&
  81                     copy_to_user(base + argv->v_size * i, buf,
  82                                  argv->v_size * nr)) {
  83                         ret = -EFAULT;
  84                         break;
  85                 }
  86                 total += nr;
  87                 if ((size_t)nr < n)
  88                         break;
  89                 if (pos == ppos)
  90                         pos += n;
  91         }
  92         argv->v_nmembs = total;
  93
  94         free_pages((unsigned long)buf, 0);
  95         return ret;
  96 }
  97
  98 static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
  99                                      unsigned int cmd, void __user *argp)
 100 {
 101         struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
 102         struct nilfs_transaction_info ti;
 103         struct nilfs_cpmode cpmode;
 104         int ret;
 105
 106         if (!capable(CAP_SYS_ADMIN))
 107                 return -EPERM;
 108         if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
 109                 return -EFAULT;
 110
 111         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 112         ret = nilfs_cpfile_change_cpmode(
 113                 cpfile, cpmode.cm_cno, cpmode.cm_mode);
 114         if (unlikely(ret < 0)) {
 115                 nilfs_transaction_abort(inode->i_sb);
 116                 return ret;
 117         }
 118         nilfs_transaction_commit(inode->i_sb); /* never fails */
 119         return ret;
 120 }
 121
 122 static int
 123 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
 124                               unsigned int cmd, void __user *argp)
 125 {
 126         struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
 127         struct nilfs_transaction_info ti;
 128         __u64 cno;
 129         int ret;
 130
 131         if (!capable(CAP_SYS_ADMIN))
 132                 return -EPERM;
 133         if (copy_from_user(&cno, argp, sizeof(cno)))
 134                 return -EFAULT;
 135
 136         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 137         ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
 138         if (unlikely(ret < 0)) {
 139                 nilfs_transaction_abort(inode->i_sb);
 140                 return ret;
 141         }
 142         nilfs_transaction_commit(inode->i_sb); /* never fails */
 143         return ret;
 144 }
 145
 146 static ssize_t
 147 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 148                           void *buf, size_t size, size_t nmembs)
 149 {
 150         return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
 151                                        nmembs);
 152 }
 153
 154 static int nilfs_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
 155                                   unsigned int cmd, void __user *argp)
 156 {
 157         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 158         struct nilfs_argv argv;
 159         int ret;
 160
 161         if (copy_from_user(&argv, argp, sizeof(argv)))
 162                 return -EFAULT;
 163
 164         down_read(&nilfs->ns_segctor_sem);
 165         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 166                                     nilfs_ioctl_do_get_cpinfo);
 167         up_read(&nilfs->ns_segctor_sem);
 168         if (ret < 0)
 169                 return ret;
 170
 171         if (copy_to_user(argp, &argv, sizeof(argv)))
 172                 ret = -EFAULT;
 173         return ret;
 174 }
 175
 176 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
 177                                   unsigned int cmd, void __user *argp)
 178 {
 179         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 180         struct nilfs_cpstat cpstat;
 181         int ret;
 182
 183         down_read(&nilfs->ns_segctor_sem);
 184         ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
 185         up_read(&nilfs->ns_segctor_sem);
 186         if (ret < 0)
 187                 return ret;
 188
 189         if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
 190                 ret = -EFAULT;
 191         return ret;
 192 }
 193
 194 static ssize_t
 195 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 196                           void *buf, size_t size, size_t nmembs)
 197 {
 198         return nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
 199 }
 200
 201 static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
 202                                   unsigned int cmd, void __user *argp)
 203 {
 204         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 205         struct nilfs_argv argv;
 206         int ret;
 207
 208         if (copy_from_user(&argv, argp, sizeof(argv)))
 209                 return -EFAULT;
 210
 211         down_read(&nilfs->ns_segctor_sem);
 212         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 213                                     nilfs_ioctl_do_get_suinfo);
 214         up_read(&nilfs->ns_segctor_sem);
 215         if (ret < 0)
 216                 return ret;
 217
 218         if (copy_to_user(argp, &argv, sizeof(argv)))
 219                 ret = -EFAULT;
 220         return ret;
 221 }
 222
 223 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
 224                                   unsigned int cmd, void __user *argp)
 225 {
 226         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 227         struct nilfs_sustat sustat;
 228         int ret;
 229
 230         down_read(&nilfs->ns_segctor_sem);
 231         ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
 232         up_read(&nilfs->ns_segctor_sem);
 233         if (ret < 0)
 234                 return ret;
 235
 236         if (copy_to_user(argp, &sustat, sizeof(sustat)))
 237                 ret = -EFAULT;
 238         return ret;
 239 }
 240
 241 static ssize_t
 242 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 243                          void *buf, size_t size, size_t nmembs)
 244 {
 245         return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
 246 }
 247
 248 static int nilfs_ioctl_get_vinfo(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         down_read(&nilfs->ns_segctor_sem);
 259         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 260                                     nilfs_ioctl_do_get_vinfo);
 261         up_read(&nilfs->ns_segctor_sem);
 262         if (ret < 0)
 263                 return ret;
 264
 265         if (copy_to_user(argp, &argv, sizeof(argv)))
 266                 ret = -EFAULT;
 267         return ret;
 268 }
 269
 270 static ssize_t
 271 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
 272                           void *buf, size_t size, size_t nmembs)
 273 {
 274         struct inode *dat = nilfs_dat_inode(nilfs);
 275         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
 276         struct nilfs_bdesc *bdescs = buf;
 277         int ret, i;
 278
 279         for (i = 0; i < nmembs; i++) {
 280                 ret = nilfs_bmap_lookup_at_level(bmap,
 281                                                  bdescs[i].bd_offset,
 282                                                  bdescs[i].bd_level + 1,
 283                                                  &bdescs[i].bd_blocknr);
 284                 if (ret < 0) {
 285                         if (ret != -ENOENT)
 286                                 return ret;
 287                         bdescs[i].bd_blocknr = 0;
 288                 }
 289         }
 290         return nmembs;
 291 }
 292
 293 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
 294                                   unsigned int cmd, void __user *argp)
 295 {
 296         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 297         struct nilfs_argv argv;
 298         int ret;
 299
 300         if (copy_from_user(&argv, argp, sizeof(argv)))
 301                 return -EFAULT;
 302
 303         down_read(&nilfs->ns_segctor_sem);
 304         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 305                                     nilfs_ioctl_do_get_bdescs);
 306         up_read(&nilfs->ns_segctor_sem);
 307         if (ret < 0)
 308                 return ret;
 309
 310         if (copy_to_user(argp, &argv, sizeof(argv)))
 311                 ret = -EFAULT;
 312         return ret;
 313 }
 314
 315 static int nilfs_ioctl_move_inode_block(struct inode *inode,
 316                                         struct nilfs_vdesc *vdesc,
 317                                         struct list_head *buffers)
 318 {
 319         struct buffer_head *bh;
 320         int ret;
 321
 322         if (vdesc->vd_flags == 0)
 323                 ret = nilfs_gccache_submit_read_data(
 324                         inode, vdesc->vd_offset, vdesc->vd_blocknr,
 325                         vdesc->vd_vblocknr, &bh);
 326         else
 327                 ret = nilfs_gccache_submit_read_node(
 328                         inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
 329
 330         if (unlikely(ret < 0)) {
 331                 if (ret == -ENOENT)
 332                         printk(KERN_CRIT
 333                                "%s: invalid virtual block address (%s): "
 334                                "ino=%llu, cno=%llu, offset=%llu, "
 335                                "blocknr=%llu, vblocknr=%llu\n",
 336                                __func__, vdesc->vd_flags ? "node" : "data",
 337                                (unsigned long long)vdesc->vd_ino,
 338                                (unsigned long long)vdesc->vd_cno,
 339                                (unsigned long long)vdesc->vd_offset,
 340                                (unsigned long long)vdesc->vd_blocknr,
 341                                (unsigned long long)vdesc->vd_vblocknr);
 342                 return ret;
 343         }
 344         bh->b_private = vdesc;
 345         list_add_tail(&bh->b_assoc_buffers, buffers);
 346         return 0;
 347 }
 348
 349 static ssize_t
 350 nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, __u64 *posp, int flags,
 351                            void *buf, size_t size, size_t nmembs)
 352 {
 353         struct inode *inode;
 354         struct nilfs_vdesc *vdesc;
 355         struct buffer_head *bh, *n;
 356         LIST_HEAD(buffers);
 357         ino_t ino;
 358         __u64 cno;
 359         int i, ret;
 360
 361         for (i = 0, vdesc = buf; i < nmembs; ) {
 362                 ino = vdesc->vd_ino;
 363                 cno = vdesc->vd_cno;
 364                 inode = nilfs_gc_iget(nilfs, ino, cno);
 365                 if (unlikely(inode == NULL)) {
 366                         ret = -ENOMEM;
 367                         goto failed;
 368                 }
 369                 do {
 370                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
 371                                                            &buffers);
 372                         if (unlikely(ret < 0))
 373                                 goto failed;
 374                         vdesc++;
 375                 } while (++i < nmembs &&
 376                          vdesc->vd_ino == ino && vdesc->vd_cno == cno);
 377         }
 378
 379         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 380                 ret = nilfs_gccache_wait_and_mark_dirty(bh);
 381                 if (unlikely(ret < 0)) {
 382                         if (ret == -EEXIST) {
 383                                 vdesc = bh->b_private;
 384                                 printk(KERN_CRIT
 385                                        "%s: conflicting %s buffer: "
 386                                        "ino=%llu, cno=%llu, offset=%llu, "
 387                                        "blocknr=%llu, vblocknr=%llu\n",
 388                                        __func__,
 389                                        vdesc->vd_flags ? "node" : "data",
 390                                        (unsigned long long)vdesc->vd_ino,
 391                                        (unsigned long long)vdesc->vd_cno,
 392                                        (unsigned long long)vdesc->vd_offset,
 393                                        (unsigned long long)vdesc->vd_blocknr,
 394                                        (unsigned long long)vdesc->vd_vblocknr);
 395                         }
 396                         goto failed;
 397                 }
 398                 list_del_init(&bh->b_assoc_buffers);
 399                 bh->b_private = NULL;
 400                 brelse(bh);
 401         }
 402         return nmembs;
 403
 404  failed:
 405         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 406                 list_del_init(&bh->b_assoc_buffers);
 407                 bh->b_private = NULL;
 408                 brelse(bh);
 409         }
 410         return ret;
 411 }
 412
 413 static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
 414                                           struct nilfs_argv *argv,
 415                                           int dir)
 416 {
 417         return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
 418                                      nilfs_ioctl_do_move_blocks);
 419 }
 420
 421 static ssize_t
 422 nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, __u64 *posp,
 423                                   int flags, void *buf, size_t size,
 424                                   size_t nmembs)
 425 {
 426         struct inode *cpfile = nilfs->ns_cpfile;
 427         struct nilfs_period *periods = buf;
 428         int ret, i;
 429
 430         for (i = 0; i < nmembs; i++) {
 431                 ret = nilfs_cpfile_delete_checkpoints(
 432                         cpfile, periods[i].p_start, periods[i].p_end);
 433                 if (ret < 0)
 434                         return ret;
 435         }
 436         return nmembs;
 437 }
 438
 439 static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
 440                                                  struct nilfs_argv *argv,
 441                                                  int dir)
 442 {
 443         return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
 444                                      nilfs_ioctl_do_delete_checkpoints);
 445 }
 446
 447 static ssize_t
 448 nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, __u64 *posp, int flags,
 449                               void *buf, size_t size, size_t nmembs)
 450 {
 451         int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
 452
 453         return (ret < 0) ? ret : nmembs;
 454 }
 455
 456 static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
 457                                              struct nilfs_argv *argv,
 458                                              int dir)
 459 {
 460         return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
 461                                      nilfs_ioctl_do_free_vblocknrs);
 462 }
 463
 464 static ssize_t
 465 nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, __u64 *posp,
 466                                  int flags, void *buf, size_t size,
 467                                  size_t nmembs)
 468 {
 469         struct inode *dat = nilfs_dat_inode(nilfs);
 470         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
 471         struct nilfs_bdesc *bdescs = buf;
 472         int ret, i;
 473
 474         for (i = 0; i < nmembs; i++) {
 475                 /* XXX: use macro or inline func to check liveness */
 476                 ret = nilfs_bmap_lookup_at_level(bmap,
 477                                                  bdescs[i].bd_offset,
 478                                                  bdescs[i].bd_level + 1,
 479                                                  &bdescs[i].bd_blocknr);
 480                 if (ret < 0) {
 481                         if (ret != -ENOENT)
 482                                 return ret;
 483                         bdescs[i].bd_blocknr = 0;
 484                 }
 485                 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
 486                         /* skip dead block */
 487                         continue;
 488                 if (bdescs[i].bd_level == 0) {
 489                         ret = nilfs_mdt_mark_block_dirty(dat,
 490                                                          bdescs[i].bd_offset);
 491                         if (ret < 0) {
 492                                 WARN_ON(ret == -ENOENT);
 493                                 return ret;
 494                         }
 495                 } else {
 496                         ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
 497                                               bdescs[i].bd_level);
 498                         if (ret < 0) {
 499                                 WARN_ON(ret == -ENOENT);
 500                                 return ret;
 501                         }
 502                 }
 503         }
 504         return nmembs;
 505 }
 506
 507 static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 508                                                 struct nilfs_argv *argv,
 509                                                 int dir)
 510 {
 511         return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
 512                                      nilfs_ioctl_do_mark_blocks_dirty);
 513 }
 514
 515 static ssize_t
 516 nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, __u64 *posp, int flags,
 517                              void *buf, size_t size, size_t nmembs)
 518 {
 519         struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);
 520         int ret;
 521
 522         if (unlikely(!sbi))
 523                 return -EROFS;
 524         ret = nilfs_segctor_add_segments_to_be_freed(
 525                 NILFS_SC(sbi), buf, nmembs);
 526         nilfs_put_writer(nilfs);
 527
 528         return (ret < 0) ? ret : nmembs;
 529 }
 530
 531 static inline int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
 532                                              struct nilfs_argv *argv,
 533                                              int dir)
 534 {
 535         return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
 536                                      nilfs_ioctl_do_free_segments);
 537 }
 538
 539 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
 540                                        void __user *argp)
 541 {
 542         struct nilfs_argv argv[5];
 543         const char *msg;
 544         int dir, ret;
 545
 546         if (copy_from_user(argv, argp, sizeof(argv)))
 547                 return -EFAULT;
 548
 549         dir = _IOC_WRITE;
 550         ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], dir);
 551         if (ret < 0) {
 552                 msg = "cannot read source blocks";
 553                 goto failed;
 554         }
 555         ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
 556         if (ret < 0) {
 557                 /*
 558                  * can safely abort because checkpoints can be removed
 559                  * independently.
 560                  */
 561                 msg = "cannot delete checkpoints";
 562                 goto failed;
 563         }
 564         ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
 565         if (ret < 0) {
 566                 /*
 567                  * can safely abort because DAT file is updated atomically
 568                  * using a copy-on-write technique.
 569                  */
 570                 msg = "cannot delete virtual blocks from DAT file";
 571                 goto failed;
 572         }
 573         ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
 574         if (ret < 0) {
 575                 /*
 576                  * can safely abort because the operation is nondestructive.
 577                  */
 578                 msg = "cannot mark copying blocks dirty";
 579                 goto failed;
 580         }
 581         ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
 582         if (ret < 0) {
 583                 /*
 584                  * can safely abort because this operation is atomic.
 585                  */
 586                 msg = "cannot set segments to be freed";
 587                 goto failed;
 588         }
 589         return 0;
 590
 591  failed:
 592         nilfs_remove_all_gcinode(nilfs);
 593         printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
 594                msg, ret);
 595         return ret;
 596 }
 597
 598 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
 599                                       unsigned int cmd, void __user *argp)
 600 {
 601         if (!capable(CAP_SYS_ADMIN))
 602                 return -EPERM;
 603         return nilfs_clean_segments(inode->i_sb, argp);
 604 }
 605
 606 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
 607                             unsigned int cmd, void __user *argp)
 608 {
 609         __u64 cno;
 610         int ret;
 611
 612         ret = nilfs_construct_segment(inode->i_sb);
 613         if (ret < 0)
 614                 return ret;
 615
 616         if (argp != NULL) {
 617                 cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
 618                 if (copy_to_user(argp, &cno, sizeof(cno)))
 619                         return -EFAULT;
 620         }
 621         return 0;
 622 }
 623
 624 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 625 {
 626         struct inode *inode = filp->f_dentry->d_inode;
 627         void __user *argp = (void * __user *)arg;
 628
 629         switch (cmd) {
 630         case NILFS_IOCTL_CHANGE_CPMODE:
 631                 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
 632         case NILFS_IOCTL_DELETE_CHECKPOINT:
 633                 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
 634         case NILFS_IOCTL_GET_CPINFO:
 635                 return nilfs_ioctl_get_cpinfo(inode, filp, cmd, argp);
 636         case NILFS_IOCTL_GET_CPSTAT:
 637                 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
 638         case NILFS_IOCTL_GET_SUINFO:
 639                 return nilfs_ioctl_get_suinfo(inode, filp, cmd, argp);
 640         case NILFS_IOCTL_GET_SUSTAT:
 641                 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
 642         case NILFS_IOCTL_GET_VINFO:
 643                 /* XXX: rename to ??? */
 644                 return nilfs_ioctl_get_vinfo(inode, filp, cmd, argp);
 645         case NILFS_IOCTL_GET_BDESCS:
 646                 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
 647         case NILFS_IOCTL_CLEAN_SEGMENTS:
 648                 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
 649         case NILFS_IOCTL_SYNC:
 650                 return nilfs_ioctl_sync(inode, filp, cmd, argp);
 651         default:
 652                 return -ENOTTY;
 653         }
 654 }