fs/nilfs2/ioctl.c

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