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 the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 103         struct inode *cpfile = nilfs->ns_cpfile;
 104         struct nilfs_transaction_info ti;
 105         struct nilfs_cpmode cpmode;
 106         int ret;
 107
 108         if (!capable(CAP_SYS_ADMIN))
 109                 return -EPERM;
 110         if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
 111                 return -EFAULT;
 112
 113         mutex_lock(&nilfs->ns_mount_mutex);
 114         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 115         ret = nilfs_cpfile_change_cpmode(
 116                 cpfile, cpmode.cm_cno, cpmode.cm_mode);
 117         if (unlikely(ret < 0)) {
 118                 nilfs_transaction_abort(inode->i_sb);
 119                 mutex_unlock(&nilfs->ns_mount_mutex);
 120                 return ret;
 121         }
 122         nilfs_transaction_commit(inode->i_sb); /* never fails */
 123         mutex_unlock(&nilfs->ns_mount_mutex);
 124         return ret;
 125 }
 126
 127 static int
 128 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
 129                               unsigned int cmd, void __user *argp)
 130 {
 131         struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
 132         struct nilfs_transaction_info ti;
 133         __u64 cno;
 134         int ret;
 135
 136         if (!capable(CAP_SYS_ADMIN))
 137                 return -EPERM;
 138         if (copy_from_user(&cno, argp, sizeof(cno)))
 139                 return -EFAULT;
 140
 141         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 142         ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
 143         if (unlikely(ret < 0)) {
 144                 nilfs_transaction_abort(inode->i_sb);
 145                 return ret;
 146         }
 147         nilfs_transaction_commit(inode->i_sb); /* never fails */
 148         return ret;
 149 }
 150
 151 static ssize_t
 152 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 153                           void *buf, size_t size, size_t nmembs)
 154 {
 155         int ret;
 156
 157         down_read(&nilfs->ns_segctor_sem);
 158         ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
 159                                       size, nmembs);
 160         up_read(&nilfs->ns_segctor_sem);
 161         return ret;
 162 }
 163
 164 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
 165                                   unsigned int cmd, void __user *argp)
 166 {
 167         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 168         struct nilfs_cpstat cpstat;
 169         int ret;
 170
 171         down_read(&nilfs->ns_segctor_sem);
 172         ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
 173         up_read(&nilfs->ns_segctor_sem);
 174         if (ret < 0)
 175                 return ret;
 176
 177         if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
 178                 ret = -EFAULT;
 179         return ret;
 180 }
 181
 182 static ssize_t
 183 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 184                           void *buf, size_t size, size_t nmembs)
 185 {
 186         int ret;
 187
 188         down_read(&nilfs->ns_segctor_sem);
 189         ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
 190                                       nmembs);
 191         up_read(&nilfs->ns_segctor_sem);
 192         return ret;
 193 }
 194
 195 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
 196                                   unsigned int cmd, void __user *argp)
 197 {
 198         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 199         struct nilfs_sustat sustat;
 200         int ret;
 201
 202         down_read(&nilfs->ns_segctor_sem);
 203         ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
 204         up_read(&nilfs->ns_segctor_sem);
 205         if (ret < 0)
 206                 return ret;
 207
 208         if (copy_to_user(argp, &sustat, sizeof(sustat)))
 209                 ret = -EFAULT;
 210         return ret;
 211 }
 212
 213 static ssize_t
 214 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 215                          void *buf, size_t size, size_t nmembs)
 216 {
 217         int ret;
 218
 219         down_read(&nilfs->ns_segctor_sem);
 220         ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, size, nmembs);
 221         up_read(&nilfs->ns_segctor_sem);
 222         return ret;
 223 }
 224
 225 static ssize_t
 226 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
 227                           void *buf, size_t size, size_t nmembs)
 228 {
 229         struct inode *dat = nilfs_dat_inode(nilfs);
 230         struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
 231         struct nilfs_bdesc *bdescs = buf;
 232         int ret, i;
 233
 234         down_read(&nilfs->ns_segctor_sem);
 235         for (i = 0; i < nmembs; i++) {
 236                 ret = nilfs_bmap_lookup_at_level(bmap,
 237                                                  bdescs[i].bd_offset,
 238                                                  bdescs[i].bd_level + 1,
 239                                                  &bdescs[i].bd_blocknr);
 240                 if (ret < 0) {
 241                         if (ret != -ENOENT) {
 242                                 up_read(&nilfs->ns_segctor_sem);
 243                                 return ret;
 244                         }
 245                         bdescs[i].bd_blocknr = 0;
 246                 }
 247         }
 248         up_read(&nilfs->ns_segctor_sem);
 249         return nmembs;
 250 }
 251
 252 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
 253                                   unsigned int cmd, void __user *argp)
 254 {
 255         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 256         struct nilfs_argv argv;
 257         int ret;
 258
 259         if (copy_from_user(&argv, argp, sizeof(argv)))
 260                 return -EFAULT;
 261
 262         if (argv.v_size != sizeof(struct nilfs_bdesc))
 263                 return -EINVAL;
 264
 265         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 266                                     nilfs_ioctl_do_get_bdescs);
 267         if (ret < 0)
 268                 return ret;
 269
 270         if (copy_to_user(argp, &argv, sizeof(argv)))
 271                 ret = -EFAULT;
 272         return ret;
 273 }
 274
 275 static int nilfs_ioctl_move_inode_block(struct inode *inode,
 276                                         struct nilfs_vdesc *vdesc,
 277                                         struct list_head *buffers)
 278 {
 279         struct buffer_head *bh;
 280         int ret;
 281
 282         if (vdesc->vd_flags == 0)
 283                 ret = nilfs_gccache_submit_read_data(
 284                         inode, vdesc->vd_offset, vdesc->vd_blocknr,
 285                         vdesc->vd_vblocknr, &bh);
 286         else
 287                 ret = nilfs_gccache_submit_read_node(
 288                         inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
 289
 290         if (unlikely(ret < 0)) {
 291                 if (ret == -ENOENT)
 292                         printk(KERN_CRIT
 293                                "%s: invalid virtual block address (%s): "
 294                                "ino=%llu, cno=%llu, offset=%llu, "
 295                                "blocknr=%llu, vblocknr=%llu\n",
 296                                __func__, vdesc->vd_flags ? "node" : "data",
 297                                (unsigned long long)vdesc->vd_ino,
 298                                (unsigned long long)vdesc->vd_cno,
 299                                (unsigned long long)vdesc->vd_offset,
 300                                (unsigned long long)vdesc->vd_blocknr,
 301                                (unsigned long long)vdesc->vd_vblocknr);
 302                 return ret;
 303         }
 304         if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
 305                 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
 306                        "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
 307                        __func__, vdesc->vd_flags ? "node" : "data",
 308                        (unsigned long long)vdesc->vd_ino,
 309                        (unsigned long long)vdesc->vd_cno,
 310                        (unsigned long long)vdesc->vd_offset,
 311                        (unsigned long long)vdesc->vd_blocknr,
 312                        (unsigned long long)vdesc->vd_vblocknr);
 313                 brelse(bh);
 314                 return -EEXIST;
 315         }
 316         list_add_tail(&bh->b_assoc_buffers, buffers);
 317         return 0;
 318 }
 319
 320 static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
 321                                    struct nilfs_argv *argv, void *buf)
 322 {
 323         size_t nmembs = argv->v_nmembs;
 324         struct inode *inode;
 325         struct nilfs_vdesc *vdesc;
 326         struct buffer_head *bh, *n;
 327         LIST_HEAD(buffers);
 328         ino_t ino;
 329         __u64 cno;
 330         int i, ret;
 331
 332         for (i = 0, vdesc = buf; i < nmembs; ) {
 333                 ino = vdesc->vd_ino;
 334                 cno = vdesc->vd_cno;
 335                 inode = nilfs_gc_iget(nilfs, ino, cno);
 336                 if (unlikely(inode == NULL)) {
 337                         ret = -ENOMEM;
 338                         goto failed;
 339                 }
 340                 do {
 341                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
 342                                                            &buffers);
 343                         if (unlikely(ret < 0))
 344                                 goto failed;
 345                         vdesc++;
 346                 } while (++i < nmembs &&
 347                          vdesc->vd_ino == ino && vdesc->vd_cno == cno);
 348         }
 349
 350         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 351                 ret = nilfs_gccache_wait_and_mark_dirty(bh);
 352                 if (unlikely(ret < 0)) {
 353                         WARN_ON(ret == -EEXIST);
 354                         goto failed;
 355                 }
 356                 list_del_init(&bh->b_assoc_buffers);
 357                 brelse(bh);
 358         }
 359         return nmembs;
 360
 361  failed:
 362         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 363                 list_del_init(&bh->b_assoc_buffers);
 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         printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
 475                msg, ret);
 476         return ret;
 477 }
 478
 479 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
 480                                       unsigned int cmd, void __user *argp)
 481 {
 482         struct nilfs_argv argv[5];
 483         const static size_t argsz[5] = {
 484                 sizeof(struct nilfs_vdesc),
 485                 sizeof(struct nilfs_period),
 486                 sizeof(__u64),
 487                 sizeof(struct nilfs_bdesc),
 488                 sizeof(__u64),
 489         };
 490         void __user *base;
 491         void *kbufs[5];
 492         struct the_nilfs *nilfs;
 493         size_t len, nsegs;
 494         int n, ret;
 495
 496         if (!capable(CAP_SYS_ADMIN))
 497                 return -EPERM;
 498
 499         if (copy_from_user(argv, argp, sizeof(argv)))
 500                 return -EFAULT;
 501
 502         nsegs = argv[4].v_nmembs;
 503         if (argv[4].v_size != argsz[4])
 504                 return -EINVAL;
 505         /*
 506          * argv[4] points to segment numbers this ioctl cleans.  We
 507          * use kmalloc() for its buffer because memory used for the
 508          * segment numbers is enough small.
 509          */
 510         kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
 511                                nsegs * sizeof(__u64));
 512         if (IS_ERR(kbufs[4]))
 513                 return PTR_ERR(kbufs[4]);
 514
 515         nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 516
 517         for (n = 0; n < 4; n++) {
 518                 ret = -EINVAL;
 519                 if (argv[n].v_size != argsz[n])
 520                         goto out_free;
 521
 522                 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
 523                         goto out_free;
 524
 525                 len = argv[n].v_size * argv[n].v_nmembs;
 526                 base = (void __user *)(unsigned long)argv[n].v_base;
 527                 if (len == 0) {
 528                         kbufs[n] = NULL;
 529                         continue;
 530                 }
 531
 532                 kbufs[n] = vmalloc(len);
 533                 if (!kbufs[n]) {
 534                         ret = -ENOMEM;
 535                         goto out_free;
 536                 }
 537                 if (copy_from_user(kbufs[n], base, len)) {
 538                         ret = -EFAULT;
 539                         vfree(kbufs[n]);
 540                         goto out_free;
 541                 }
 542         }
 543
 544         /*
 545          * nilfs_ioctl_move_blocks() will call nilfs_gc_iget(),
 546          * which will operates an inode list without blocking.
 547          * To protect the list from concurrent operations,
 548          * nilfs_ioctl_move_blocks should be atomic operation.
 549          */
 550         if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
 551                 ret = -EBUSY;
 552                 goto out_free;
 553         }
 554
 555         ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
 556         if (ret < 0)
 557                 printk(KERN_ERR "NILFS: GC failed during preparation: "
 558                         "cannot read source blocks: err=%d\n", ret);
 559         else
 560                 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
 561
 562         if (ret < 0)
 563                 nilfs_remove_all_gcinode(nilfs);
 564         clear_nilfs_gc_running(nilfs);
 565
 566  out_free:
 567         while (--n >= 0)
 568                 vfree(kbufs[n]);
 569         kfree(kbufs[4]);
 570         return ret;
 571 }
 572
 573 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
 574                             unsigned int cmd, void __user *argp)
 575 {
 576         __u64 cno;
 577         int ret;
 578
 579         ret = nilfs_construct_segment(inode->i_sb);
 580         if (ret < 0)
 581                 return ret;
 582
 583         if (argp != NULL) {
 584                 cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
 585                 if (copy_to_user(argp, &cno, sizeof(cno)))
 586                         return -EFAULT;
 587         }
 588         return 0;
 589 }
 590
 591 static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
 592                                 unsigned int cmd, void __user *argp,
 593                                 size_t membsz,
 594                                 ssize_t (*dofunc)(struct the_nilfs *,
 595                                                   __u64 *, int,
 596                                                   void *, size_t, size_t))
 597
 598 {
 599         struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
 600         struct nilfs_argv argv;
 601         int ret;
 602
 603         if (copy_from_user(&argv, argp, sizeof(argv)))
 604                 return -EFAULT;
 605
 606         if (argv.v_size < membsz)
 607                 return -EINVAL;
 608
 609         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
 610         if (ret < 0)
 611                 return ret;
 612
 613         if (copy_to_user(argp, &argv, sizeof(argv)))
 614                 ret = -EFAULT;
 615         return ret;
 616 }
 617
 618 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 619 {
 620         struct inode *inode = filp->f_dentry->d_inode;
 621         void __user *argp = (void * __user *)arg;
 622
 623         switch (cmd) {
 624         case NILFS_IOCTL_CHANGE_CPMODE:
 625                 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
 626         case NILFS_IOCTL_DELETE_CHECKPOINT:
 627                 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
 628         case NILFS_IOCTL_GET_CPINFO:
 629                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 630                                             sizeof(struct nilfs_cpinfo),
 631                                             nilfs_ioctl_do_get_cpinfo);
 632         case NILFS_IOCTL_GET_CPSTAT:
 633                 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
 634         case NILFS_IOCTL_GET_SUINFO:
 635                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 636                                             sizeof(struct nilfs_suinfo),
 637                                             nilfs_ioctl_do_get_suinfo);
 638         case NILFS_IOCTL_GET_SUSTAT:
 639                 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
 640         case NILFS_IOCTL_GET_VINFO:
 641                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 642                                             sizeof(struct nilfs_vinfo),
 643                                             nilfs_ioctl_do_get_vinfo);
 644         case NILFS_IOCTL_GET_BDESCS:
 645                 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
 646         case NILFS_IOCTL_CLEAN_SEGMENTS:
 647                 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
 648         case NILFS_IOCTL_SYNC:
 649                 return nilfs_ioctl_sync(inode, filp, cmd, argp);
 650         default:
 651                 return -ENOTTY;
 652         }
 653 }