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/compat.h>       /* compat_ptr() */
  30 #include <linux/mount.h>        /* mnt_want_write_file(), mnt_drop_write_file() */
  31 #include <linux/buffer_head.h>
  32 #include <linux/nilfs2_fs.h>
  33 #include "nilfs.h"
  34 #include "segment.h"
  35 #include "bmap.h"
  36 #include "cpfile.h"
  37 #include "sufile.h"
  38 #include "dat.h"
  39
  40
  41 static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
  42                                  struct nilfs_argv *argv, int dir,
  43                                  ssize_t (*dofunc)(struct the_nilfs *,
  44                                                    __u64 *, int,
  45                                                    void *, size_t, size_t))
  46 {
  47         void *buf;
  48         void __user *base = (void __user *)(unsigned long)argv->v_base;
  49         size_t maxmembs, total, n;
  50         ssize_t nr;
  51         int ret, i;
  52         __u64 pos, ppos;
  53
  54         if (argv->v_nmembs == 0)
  55                 return 0;
  56
  57         if (argv->v_size > PAGE_SIZE)
  58                 return -EINVAL;
  59
  60         buf = (void *)__get_free_pages(GFP_NOFS, 0);
  61         if (unlikely(!buf))
  62                 return -ENOMEM;
  63         maxmembs = PAGE_SIZE / argv->v_size;
  64
  65         ret = 0;
  66         total = 0;
  67         pos = argv->v_index;
  68         for (i = 0; i < argv->v_nmembs; i += n) {
  69                 n = (argv->v_nmembs - i < maxmembs) ?
  70                         argv->v_nmembs - i : maxmembs;
  71                 if ((dir & _IOC_WRITE) &&
  72                     copy_from_user(buf, base + argv->v_size * i,
  73                                    argv->v_size * n)) {
  74                         ret = -EFAULT;
  75                         break;
  76                 }
  77                 ppos = pos;
  78                 nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
  79                                n);
  80                 if (nr < 0) {
  81                         ret = nr;
  82                         break;
  83                 }
  84                 if ((dir & _IOC_READ) &&
  85                     copy_to_user(base + argv->v_size * i, buf,
  86                                  argv->v_size * nr)) {
  87                         ret = -EFAULT;
  88                         break;
  89                 }
  90                 total += nr;
  91                 if ((size_t)nr < n)
  92                         break;
  93                 if (pos == ppos)
  94                         pos += n;
  95         }
  96         argv->v_nmembs = total;
  97
  98         free_pages((unsigned long)buf, 0);
  99         return ret;
 100 }
 101
 102 static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
 103 {
 104         unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
 105
 106         return put_user(flags, (int __user *)argp);
 107 }
 108
 109 static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
 110                                 void __user *argp)
 111 {
 112         struct nilfs_transaction_info ti;
 113         unsigned int flags, oldflags;
 114         int ret;
 115
 116         if (!inode_owner_or_capable(inode))
 117                 return -EACCES;
 118
 119         if (get_user(flags, (int __user *)argp))
 120                 return -EFAULT;
 121
 122         ret = mnt_want_write_file(filp);
 123         if (ret)
 124                 return ret;
 125
 126         flags = nilfs_mask_flags(inode->i_mode, flags);
 127
 128         mutex_lock(&inode->i_mutex);
 129
 130         oldflags = NILFS_I(inode)->i_flags;
 131
 132         /*
 133          * The IMMUTABLE and APPEND_ONLY flags can only be changed by the
 134          * relevant capability.
 135          */
 136         ret = -EPERM;
 137         if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
 138             !capable(CAP_LINUX_IMMUTABLE))
 139                 goto out;
 140
 141         ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
 142         if (ret)
 143                 goto out;
 144
 145         NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
 146                 (flags & FS_FL_USER_MODIFIABLE);
 147
 148         nilfs_set_inode_flags(inode);
 149         inode->i_ctime = CURRENT_TIME;
 150         if (IS_SYNC(inode))
 151                 nilfs_set_transaction_flag(NILFS_TI_SYNC);
 152
 153         nilfs_mark_inode_dirty(inode);
 154         ret = nilfs_transaction_commit(inode->i_sb);
 155 out:
 156         mutex_unlock(&inode->i_mutex);
 157         mnt_drop_write_file(filp);
 158         return ret;
 159 }
 160
 161 static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
 162 {
 163         return put_user(inode->i_generation, (int __user *)argp);
 164 }
 165
 166 static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
 167                                      unsigned int cmd, void __user *argp)
 168 {
 169         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 170         struct nilfs_transaction_info ti;
 171         struct nilfs_cpmode cpmode;
 172         int ret;
 173
 174         if (!capable(CAP_SYS_ADMIN))
 175                 return -EPERM;
 176
 177         ret = mnt_want_write_file(filp);
 178         if (ret)
 179                 return ret;
 180
 181         ret = -EFAULT;
 182         if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
 183                 goto out;
 184
 185         mutex_lock(&nilfs->ns_snapshot_mount_mutex);
 186
 187         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 188         ret = nilfs_cpfile_change_cpmode(
 189                 nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
 190         if (unlikely(ret < 0))
 191                 nilfs_transaction_abort(inode->i_sb);
 192         else
 193                 nilfs_transaction_commit(inode->i_sb); /* never fails */
 194
 195         mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
 196 out:
 197         mnt_drop_write_file(filp);
 198         return ret;
 199 }
 200
 201 static int
 202 nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
 203                               unsigned int cmd, void __user *argp)
 204 {
 205         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 206         struct nilfs_transaction_info ti;
 207         __u64 cno;
 208         int ret;
 209
 210         if (!capable(CAP_SYS_ADMIN))
 211                 return -EPERM;
 212
 213         ret = mnt_want_write_file(filp);
 214         if (ret)
 215                 return ret;
 216
 217         ret = -EFAULT;
 218         if (copy_from_user(&cno, argp, sizeof(cno)))
 219                 goto out;
 220
 221         nilfs_transaction_begin(inode->i_sb, &ti, 0);
 222         ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
 223         if (unlikely(ret < 0))
 224                 nilfs_transaction_abort(inode->i_sb);
 225         else
 226                 nilfs_transaction_commit(inode->i_sb); /* never fails */
 227 out:
 228         mnt_drop_write_file(filp);
 229         return ret;
 230 }
 231
 232 static ssize_t
 233 nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 234                           void *buf, size_t size, size_t nmembs)
 235 {
 236         int ret;
 237
 238         down_read(&nilfs->ns_segctor_sem);
 239         ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
 240                                       size, nmembs);
 241         up_read(&nilfs->ns_segctor_sem);
 242         return ret;
 243 }
 244
 245 static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
 246                                   unsigned int cmd, void __user *argp)
 247 {
 248         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 249         struct nilfs_cpstat cpstat;
 250         int ret;
 251
 252         down_read(&nilfs->ns_segctor_sem);
 253         ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
 254         up_read(&nilfs->ns_segctor_sem);
 255         if (ret < 0)
 256                 return ret;
 257
 258         if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
 259                 ret = -EFAULT;
 260         return ret;
 261 }
 262
 263 static ssize_t
 264 nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 265                           void *buf, size_t size, size_t nmembs)
 266 {
 267         int ret;
 268
 269         down_read(&nilfs->ns_segctor_sem);
 270         ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
 271                                       nmembs);
 272         up_read(&nilfs->ns_segctor_sem);
 273         return ret;
 274 }
 275
 276 static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
 277                                   unsigned int cmd, void __user *argp)
 278 {
 279         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 280         struct nilfs_sustat sustat;
 281         int ret;
 282
 283         down_read(&nilfs->ns_segctor_sem);
 284         ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
 285         up_read(&nilfs->ns_segctor_sem);
 286         if (ret < 0)
 287                 return ret;
 288
 289         if (copy_to_user(argp, &sustat, sizeof(sustat)))
 290                 ret = -EFAULT;
 291         return ret;
 292 }
 293
 294 static ssize_t
 295 nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
 296                          void *buf, size_t size, size_t nmembs)
 297 {
 298         int ret;
 299
 300         down_read(&nilfs->ns_segctor_sem);
 301         ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
 302         up_read(&nilfs->ns_segctor_sem);
 303         return ret;
 304 }
 305
 306 static ssize_t
 307 nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
 308                           void *buf, size_t size, size_t nmembs)
 309 {
 310         struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
 311         struct nilfs_bdesc *bdescs = buf;
 312         int ret, i;
 313
 314         down_read(&nilfs->ns_segctor_sem);
 315         for (i = 0; i < nmembs; i++) {
 316                 ret = nilfs_bmap_lookup_at_level(bmap,
 317                                                  bdescs[i].bd_offset,
 318                                                  bdescs[i].bd_level + 1,
 319                                                  &bdescs[i].bd_blocknr);
 320                 if (ret < 0) {
 321                         if (ret != -ENOENT) {
 322                                 up_read(&nilfs->ns_segctor_sem);
 323                                 return ret;
 324                         }
 325                         bdescs[i].bd_blocknr = 0;
 326                 }
 327         }
 328         up_read(&nilfs->ns_segctor_sem);
 329         return nmembs;
 330 }
 331
 332 static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
 333                                   unsigned int cmd, void __user *argp)
 334 {
 335         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 336         struct nilfs_argv argv;
 337         int ret;
 338
 339         if (copy_from_user(&argv, argp, sizeof(argv)))
 340                 return -EFAULT;
 341
 342         if (argv.v_size != sizeof(struct nilfs_bdesc))
 343                 return -EINVAL;
 344
 345         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
 346                                     nilfs_ioctl_do_get_bdescs);
 347         if (ret < 0)
 348                 return ret;
 349
 350         if (copy_to_user(argp, &argv, sizeof(argv)))
 351                 ret = -EFAULT;
 352         return ret;
 353 }
 354
 355 static int nilfs_ioctl_move_inode_block(struct inode *inode,
 356                                         struct nilfs_vdesc *vdesc,
 357                                         struct list_head *buffers)
 358 {
 359         struct buffer_head *bh;
 360         int ret;
 361
 362         if (vdesc->vd_flags == 0)
 363                 ret = nilfs_gccache_submit_read_data(
 364                         inode, vdesc->vd_offset, vdesc->vd_blocknr,
 365                         vdesc->vd_vblocknr, &bh);
 366         else
 367                 ret = nilfs_gccache_submit_read_node(
 368                         inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
 369
 370         if (unlikely(ret < 0)) {
 371                 if (ret == -ENOENT)
 372                         printk(KERN_CRIT
 373                                "%s: invalid virtual block address (%s): "
 374                                "ino=%llu, cno=%llu, offset=%llu, "
 375                                "blocknr=%llu, vblocknr=%llu\n",
 376                                __func__, vdesc->vd_flags ? "node" : "data",
 377                                (unsigned long long)vdesc->vd_ino,
 378                                (unsigned long long)vdesc->vd_cno,
 379                                (unsigned long long)vdesc->vd_offset,
 380                                (unsigned long long)vdesc->vd_blocknr,
 381                                (unsigned long long)vdesc->vd_vblocknr);
 382                 return ret;
 383         }
 384         if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
 385                 printk(KERN_CRIT "%s: conflicting %s buffer: ino=%llu, "
 386                        "cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu\n",
 387                        __func__, vdesc->vd_flags ? "node" : "data",
 388                        (unsigned long long)vdesc->vd_ino,
 389                        (unsigned long long)vdesc->vd_cno,
 390                        (unsigned long long)vdesc->vd_offset,
 391                        (unsigned long long)vdesc->vd_blocknr,
 392                        (unsigned long long)vdesc->vd_vblocknr);
 393                 brelse(bh);
 394                 return -EEXIST;
 395         }
 396         list_add_tail(&bh->b_assoc_buffers, buffers);
 397         return 0;
 398 }
 399
 400 static int nilfs_ioctl_move_blocks(struct super_block *sb,
 401                                    struct nilfs_argv *argv, void *buf)
 402 {
 403         size_t nmembs = argv->v_nmembs;
 404         struct the_nilfs *nilfs = sb->s_fs_info;
 405         struct inode *inode;
 406         struct nilfs_vdesc *vdesc;
 407         struct buffer_head *bh, *n;
 408         LIST_HEAD(buffers);
 409         ino_t ino;
 410         __u64 cno;
 411         int i, ret;
 412
 413         for (i = 0, vdesc = buf; i < nmembs; ) {
 414                 ino = vdesc->vd_ino;
 415                 cno = vdesc->vd_cno;
 416                 inode = nilfs_iget_for_gc(sb, ino, cno);
 417                 if (IS_ERR(inode)) {
 418                         ret = PTR_ERR(inode);
 419                         goto failed;
 420                 }
 421                 if (list_empty(&NILFS_I(inode)->i_dirty)) {
 422                         /*
 423                          * Add the inode to GC inode list. Garbage Collection
 424                          * is serialized and no two processes manipulate the
 425                          * list simultaneously.
 426                          */
 427                         igrab(inode);
 428                         list_add(&NILFS_I(inode)->i_dirty,
 429                                  &nilfs->ns_gc_inodes);
 430                 }
 431
 432                 do {
 433                         ret = nilfs_ioctl_move_inode_block(inode, vdesc,
 434                                                            &buffers);
 435                         if (unlikely(ret < 0)) {
 436                                 iput(inode);
 437                                 goto failed;
 438                         }
 439                         vdesc++;
 440                 } while (++i < nmembs &&
 441                          vdesc->vd_ino == ino && vdesc->vd_cno == cno);
 442
 443                 iput(inode); /* The inode still remains in GC inode list */
 444         }
 445
 446         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 447                 ret = nilfs_gccache_wait_and_mark_dirty(bh);
 448                 if (unlikely(ret < 0)) {
 449                         WARN_ON(ret == -EEXIST);
 450                         goto failed;
 451                 }
 452                 list_del_init(&bh->b_assoc_buffers);
 453                 brelse(bh);
 454         }
 455         return nmembs;
 456
 457  failed:
 458         list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
 459                 list_del_init(&bh->b_assoc_buffers);
 460                 brelse(bh);
 461         }
 462         return ret;
 463 }
 464
 465 static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
 466                                           struct nilfs_argv *argv, void *buf)
 467 {
 468         size_t nmembs = argv->v_nmembs;
 469         struct inode *cpfile = nilfs->ns_cpfile;
 470         struct nilfs_period *periods = buf;
 471         int ret, i;
 472
 473         for (i = 0; i < nmembs; i++) {
 474                 ret = nilfs_cpfile_delete_checkpoints(
 475                         cpfile, periods[i].p_start, periods[i].p_end);
 476                 if (ret < 0)
 477                         return ret;
 478         }
 479         return nmembs;
 480 }
 481
 482 static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
 483                                       struct nilfs_argv *argv, void *buf)
 484 {
 485         size_t nmembs = argv->v_nmembs;
 486         int ret;
 487
 488         ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
 489
 490         return (ret < 0) ? ret : nmembs;
 491 }
 492
 493 static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
 494                                          struct nilfs_argv *argv, void *buf)
 495 {
 496         size_t nmembs = argv->v_nmembs;
 497         struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
 498         struct nilfs_bdesc *bdescs = buf;
 499         int ret, i;
 500
 501         for (i = 0; i < nmembs; i++) {
 502                 /* XXX: use macro or inline func to check liveness */
 503                 ret = nilfs_bmap_lookup_at_level(bmap,
 504                                                  bdescs[i].bd_offset,
 505                                                  bdescs[i].bd_level + 1,
 506                                                  &bdescs[i].bd_blocknr);
 507                 if (ret < 0) {
 508                         if (ret != -ENOENT)
 509                                 return ret;
 510                         bdescs[i].bd_blocknr = 0;
 511                 }
 512                 if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
 513                         /* skip dead block */
 514                         continue;
 515                 if (bdescs[i].bd_level == 0) {
 516                         ret = nilfs_mdt_mark_block_dirty(nilfs->ns_dat,
 517                                                          bdescs[i].bd_offset);
 518                         if (ret < 0) {
 519                                 WARN_ON(ret == -ENOENT);
 520                                 return ret;
 521                         }
 522                 } else {
 523                         ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
 524                                               bdescs[i].bd_level);
 525                         if (ret < 0) {
 526                                 WARN_ON(ret == -ENOENT);
 527                                 return ret;
 528                         }
 529                 }
 530         }
 531         return nmembs;
 532 }
 533
 534 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
 535                                        struct nilfs_argv *argv, void **kbufs)
 536 {
 537         const char *msg;
 538         int ret;
 539
 540         ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
 541         if (ret < 0) {
 542                 /*
 543                  * can safely abort because checkpoints can be removed
 544                  * independently.
 545                  */
 546                 msg = "cannot delete checkpoints";
 547                 goto failed;
 548         }
 549         ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
 550         if (ret < 0) {
 551                 /*
 552                  * can safely abort because DAT file is updated atomically
 553                  * using a copy-on-write technique.
 554                  */
 555                 msg = "cannot delete virtual blocks from DAT file";
 556                 goto failed;
 557         }
 558         ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
 559         if (ret < 0) {
 560                 /*
 561                  * can safely abort because the operation is nondestructive.
 562                  */
 563                 msg = "cannot mark copying blocks dirty";
 564                 goto failed;
 565         }
 566         return 0;
 567
 568  failed:
 569         printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
 570                msg, ret);
 571         return ret;
 572 }
 573
 574 static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
 575                                       unsigned int cmd, void __user *argp)
 576 {
 577         struct nilfs_argv argv[5];
 578         static const size_t argsz[5] = {
 579                 sizeof(struct nilfs_vdesc),
 580                 sizeof(struct nilfs_period),
 581                 sizeof(__u64),
 582                 sizeof(struct nilfs_bdesc),
 583                 sizeof(__u64),
 584         };
 585         void __user *base;
 586         void *kbufs[5];
 587         struct the_nilfs *nilfs;
 588         size_t len, nsegs;
 589         int n, ret;
 590
 591         if (!capable(CAP_SYS_ADMIN))
 592                 return -EPERM;
 593
 594         ret = mnt_want_write_file(filp);
 595         if (ret)
 596                 return ret;
 597
 598         ret = -EFAULT;
 599         if (copy_from_user(argv, argp, sizeof(argv)))
 600                 goto out;
 601
 602         ret = -EINVAL;
 603         nsegs = argv[4].v_nmembs;
 604         if (argv[4].v_size != argsz[4])
 605                 goto out;
 606         if (nsegs > UINT_MAX / sizeof(__u64))
 607                 goto out;
 608
 609         /*
 610          * argv[4] points to segment numbers this ioctl cleans.  We
 611          * use kmalloc() for its buffer because memory used for the
 612          * segment numbers is enough small.
 613          */
 614         kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
 615                                nsegs * sizeof(__u64));
 616         if (IS_ERR(kbufs[4])) {
 617                 ret = PTR_ERR(kbufs[4]);
 618                 goto out;
 619         }
 620         nilfs = inode->i_sb->s_fs_info;
 621
 622         for (n = 0; n < 4; n++) {
 623                 ret = -EINVAL;
 624                 if (argv[n].v_size != argsz[n])
 625                         goto out_free;
 626
 627                 if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
 628                         goto out_free;
 629
 630                 if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
 631                         goto out_free;
 632
 633                 len = argv[n].v_size * argv[n].v_nmembs;
 634                 base = (void __user *)(unsigned long)argv[n].v_base;
 635                 if (len == 0) {
 636                         kbufs[n] = NULL;
 637                         continue;
 638                 }
 639
 640                 kbufs[n] = vmalloc(len);
 641                 if (!kbufs[n]) {
 642                         ret = -ENOMEM;
 643                         goto out_free;
 644                 }
 645                 if (copy_from_user(kbufs[n], base, len)) {
 646                         ret = -EFAULT;
 647                         vfree(kbufs[n]);
 648                         goto out_free;
 649                 }
 650         }
 651
 652         /*
 653          * nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
 654          * which will operates an inode list without blocking.
 655          * To protect the list from concurrent operations,
 656          * nilfs_ioctl_move_blocks should be atomic operation.
 657          */
 658         if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
 659                 ret = -EBUSY;
 660                 goto out_free;
 661         }
 662
 663         ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
 664         if (ret < 0)
 665                 printk(KERN_ERR "NILFS: GC failed during preparation: "
 666                         "cannot read source blocks: err=%d\n", ret);
 667         else {
 668                 if (nilfs_sb_need_update(nilfs))
 669                         set_nilfs_discontinued(nilfs);
 670                 ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
 671         }
 672
 673         nilfs_remove_all_gcinodes(nilfs);
 674         clear_nilfs_gc_running(nilfs);
 675
 676 out_free:
 677         while (--n >= 0)
 678                 vfree(kbufs[n]);
 679         kfree(kbufs[4]);
 680 out:
 681         mnt_drop_write_file(filp);
 682         return ret;
 683 }
 684
 685 static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
 686                             unsigned int cmd, void __user *argp)
 687 {
 688         __u64 cno;
 689         int ret;
 690         struct the_nilfs *nilfs;
 691
 692         ret = nilfs_construct_segment(inode->i_sb);
 693         if (ret < 0)
 694                 return ret;
 695
 696         nilfs = inode->i_sb->s_fs_info;
 697         if (nilfs_test_opt(nilfs, BARRIER)) {
 698                 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 699                 if (ret == -EIO)
 700                         return ret;
 701         }
 702
 703         if (argp != NULL) {
 704                 down_read(&nilfs->ns_segctor_sem);
 705                 cno = nilfs->ns_cno - 1;
 706                 up_read(&nilfs->ns_segctor_sem);
 707                 if (copy_to_user(argp, &cno, sizeof(cno)))
 708                         return -EFAULT;
 709         }
 710         return 0;
 711 }
 712
 713 static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
 714                               void __user *argp)
 715 {
 716         __u64 newsize;
 717         int ret = -EPERM;
 718
 719         if (!capable(CAP_SYS_ADMIN))
 720                 goto out;
 721
 722         ret = mnt_want_write_file(filp);
 723         if (ret)
 724                 goto out;
 725
 726         ret = -EFAULT;
 727         if (copy_from_user(&newsize, argp, sizeof(newsize)))
 728                 goto out_drop_write;
 729
 730         ret = nilfs_resize_fs(inode->i_sb, newsize);
 731
 732 out_drop_write:
 733         mnt_drop_write_file(filp);
 734 out:
 735         return ret;
 736 }
 737
 738 static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
 739 {
 740         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 741         __u64 range[2];
 742         __u64 minseg, maxseg;
 743         unsigned long segbytes;
 744         int ret = -EPERM;
 745
 746         if (!capable(CAP_SYS_ADMIN))
 747                 goto out;
 748
 749         ret = -EFAULT;
 750         if (copy_from_user(range, argp, sizeof(__u64[2])))
 751                 goto out;
 752
 753         ret = -ERANGE;
 754         if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
 755                 goto out;
 756
 757         segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
 758
 759         minseg = range[0] + segbytes - 1;
 760         do_div(minseg, segbytes);
 761         maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
 762         do_div(maxseg, segbytes);
 763         maxseg--;
 764
 765         ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
 766 out:
 767         return ret;
 768 }
 769
 770 static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
 771                                 unsigned int cmd, void __user *argp,
 772                                 size_t membsz,
 773                                 ssize_t (*dofunc)(struct the_nilfs *,
 774                                                   __u64 *, int,
 775                                                   void *, size_t, size_t))
 776
 777 {
 778         struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 779         struct nilfs_argv argv;
 780         int ret;
 781
 782         if (copy_from_user(&argv, argp, sizeof(argv)))
 783                 return -EFAULT;
 784
 785         if (argv.v_size < membsz)
 786                 return -EINVAL;
 787
 788         ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
 789         if (ret < 0)
 790                 return ret;
 791
 792         if (copy_to_user(argp, &argv, sizeof(argv)))
 793                 ret = -EFAULT;
 794         return ret;
 795 }
 796
 797 long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 798 {
 799         struct inode *inode = file_inode(filp);
 800         void __user *argp = (void __user *)arg;
 801
 802         switch (cmd) {
 803         case FS_IOC_GETFLAGS:
 804                 return nilfs_ioctl_getflags(inode, argp);
 805         case FS_IOC_SETFLAGS:
 806                 return nilfs_ioctl_setflags(inode, filp, argp);
 807         case FS_IOC_GETVERSION:
 808                 return nilfs_ioctl_getversion(inode, argp);
 809         case NILFS_IOCTL_CHANGE_CPMODE:
 810                 return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
 811         case NILFS_IOCTL_DELETE_CHECKPOINT:
 812                 return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
 813         case NILFS_IOCTL_GET_CPINFO:
 814                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 815                                             sizeof(struct nilfs_cpinfo),
 816                                             nilfs_ioctl_do_get_cpinfo);
 817         case NILFS_IOCTL_GET_CPSTAT:
 818                 return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
 819         case NILFS_IOCTL_GET_SUINFO:
 820                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 821                                             sizeof(struct nilfs_suinfo),
 822                                             nilfs_ioctl_do_get_suinfo);
 823         case NILFS_IOCTL_GET_SUSTAT:
 824                 return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
 825         case NILFS_IOCTL_GET_VINFO:
 826                 return nilfs_ioctl_get_info(inode, filp, cmd, argp,
 827                                             sizeof(struct nilfs_vinfo),
 828                                             nilfs_ioctl_do_get_vinfo);
 829         case NILFS_IOCTL_GET_BDESCS:
 830                 return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
 831         case NILFS_IOCTL_CLEAN_SEGMENTS:
 832                 return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
 833         case NILFS_IOCTL_SYNC:
 834                 return nilfs_ioctl_sync(inode, filp, cmd, argp);
 835         case NILFS_IOCTL_RESIZE:
 836                 return nilfs_ioctl_resize(inode, filp, argp);
 837         case NILFS_IOCTL_SET_ALLOC_RANGE:
 838                 return nilfs_ioctl_set_alloc_range(inode, argp);
 839         default:
 840                 return -ENOTTY;
 841         }
 842 }
 843
 844 #ifdef CONFIG_COMPAT
 845 long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 846 {
 847         switch (cmd) {
 848         case FS_IOC32_GETFLAGS:
 849                 cmd = FS_IOC_GETFLAGS;
 850                 break;
 851         case FS_IOC32_SETFLAGS:
 852                 cmd = FS_IOC_SETFLAGS;
 853                 break;
 854         case FS_IOC32_GETVERSION:
 855                 cmd = FS_IOC_GETVERSION;
 856                 break;
 857         case NILFS_IOCTL_CHANGE_CPMODE:
 858         case NILFS_IOCTL_DELETE_CHECKPOINT:
 859         case NILFS_IOCTL_GET_CPINFO:
 860         case NILFS_IOCTL_GET_CPSTAT:
 861         case NILFS_IOCTL_GET_SUINFO:
 862         case NILFS_IOCTL_GET_SUSTAT:
 863         case NILFS_IOCTL_GET_VINFO:
 864         case NILFS_IOCTL_GET_BDESCS:
 865         case NILFS_IOCTL_CLEAN_SEGMENTS:
 866         case NILFS_IOCTL_SYNC:
 867         case NILFS_IOCTL_RESIZE:
 868         case NILFS_IOCTL_SET_ALLOC_RANGE:
 869                 break;
 870         default:
 871                 return -ENOIOCTLCMD;
 872         }
 873         return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
 874 }
 875 #endif