lustre/lvfs/fsfilt_ext3.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/lib/fsfilt_ext3.c
   5  *  Lustre filesystem abstraction routines
   6  *
   7  *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   8  *   Author: Andreas Dilger <adilger@clusterfs.com>
   9  *
  10  *   This file is part of Lustre, http://www.lustre.org.
  11  *
  12  *   Lustre is free software; you can redistribute it and/or
  13  *   modify it under the terms of version 2 of the GNU General Public
  14  *   License as published by the Free Software Foundation.
  15  *
  16  *   Lustre is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with Lustre; if not, write to the Free Software
  23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_FILTER
  27
  28 #include <linux/init.h>
  29 #include <linux/module.h>
  30 #include <linux/fs.h>
  31 #include <linux/jbd.h>
  32 #include <linux/slab.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/quotaops.h>
  35 #include <linux/ext3_fs.h>
  36 #include <linux/ext3_jbd.h>
  37 #include <linux/version.h>
  38 #include <linux/bitops.h>
  39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  40 #include <linux/ext3_xattr.h>
  41 #else
  42 #include <ext3/xattr.h>
  43 #endif
  44
  45 #include <libcfs/kp30.h>
  46 #include <linux/lustre_fsfilt.h>
  47 #include <linux/obd.h>
  48 #include <linux/obd_class.h>
  49 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  50 #include <linux/iobuf.h>
  51 #endif
  52
  53 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
  54 #include <linux/ext3_extents.h>
  55 #endif
  56
  57 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,7))
  58 # define lock_24kernel() lock_kernel()
  59 # define unlock_24kernel() unlock_kernel()
  60 #else
  61 # define lock_24kernel() do {} while (0)
  62 # define unlock_24kernel() do {} while (0)
  63 #endif
  64
  65 static kmem_cache_t *fcb_cache;
  66
  67 struct fsfilt_cb_data {
  68         struct journal_callback cb_jcb; /* jbd private data - MUST BE FIRST */
  69         fsfilt_cb_t cb_func;            /* MDS/OBD completion function */
  70         struct obd_device *cb_obd;      /* MDS/OBD completion device */
  71         __u64 cb_last_rcvd;             /* MDS/OST last committed operation */
  72         void *cb_data;                  /* MDS/OST completion function data */
  73 };
  74
  75 #ifndef EXT3_XATTR_INDEX_TRUSTED        /* temporary until we hit l28 kernel */
  76 #define EXT3_XATTR_INDEX_TRUSTED        4
  77 #endif
  78 #define XATTR_LUSTRE_MDS_LOV_EA         "lov"
  79
  80 /*
  81  * We don't currently need any additional blocks for rmdir and
  82  * unlink transactions because we are storing the OST oa_id inside
  83  * the inode (which we will be changing anyways as part of this
  84  * transaction).
  85  */
  86 static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
  87                                int logs)
  88 {
  89         /* For updates to the last received file */
  90         int nblocks = EXT3_SINGLEDATA_TRANS_BLOCKS;
  91         journal_t *journal;
  92         void *handle;
  93
  94         if (current->journal_info) {
  95                 CDEBUG(D_INODE, "increasing refcount on %p\n",
  96                        current->journal_info);
  97                 goto journal_start;
  98         }
  99
 100         switch(op) {
 101         case FSFILT_OP_RMDIR:
 102         case FSFILT_OP_UNLINK:
 103                 /* delete one file + create/update logs for each stripe */
 104                 nblocks += EXT3_DELETE_TRANS_BLOCKS;
 105                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 106                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 107                 break;
 108         case FSFILT_OP_RENAME:
 109                 /* modify additional directory */
 110                 nblocks += EXT3_SINGLEDATA_TRANS_BLOCKS;
 111                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 112                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 113                 /* no break */
 114         case FSFILT_OP_SYMLINK:
 115                 /* additional block + block bitmap + GDT for long symlink */
 116                 nblocks += 3;
 117                 /* no break */
 118         case FSFILT_OP_CREATE: {
 119 #if defined(EXT3_EXTENTS_FL) && defined(EXT3_INDEX_FL)
 120                 static int warned;
 121                 if (!warned) {
 122                         if (!test_opt(inode->i_sb, EXTENTS)) {
 123                                 warned = 1;
 124                         } else if (((EXT3_I(inode)->i_flags &
 125                               cpu_to_le32(EXT3_EXTENTS_FL | EXT3_INDEX_FL)) ==
 126                               cpu_to_le32(EXT3_EXTENTS_FL | EXT3_INDEX_FL))) {
 127                                 CWARN("extent-mapped directory found - contact "
 128                                       "CFS: support@clusterfs.com\n");
 129                                 warned = 1;
 130                         }
 131                 }
 132 #endif
 133                 /* create/update logs for each stripe */
 134                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 135                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 136                 /* no break */
 137         }
 138         case FSFILT_OP_MKDIR:
 139         case FSFILT_OP_MKNOD:
 140                 /* modify one inode + block bitmap + GDT */
 141                 nblocks += 3;
 142                 /* no break */
 143         case FSFILT_OP_LINK:
 144                 /* modify parent directory */
 145                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 146                         EXT3_DATA_TRANS_BLOCKS;
 147                 break;
 148         case FSFILT_OP_SETATTR:
 149                 /* Setattr on inode */
 150                 nblocks += 1;
 151                 break;
 152         case FSFILT_OP_CANCEL_UNLINK:
 153                 /* blocks for log header bitmap update OR
 154                  * blocks for catalog header bitmap update + unlink of logs */
 155                 nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
 156                         EXT3_DELETE_TRANS_BLOCKS * logs;
 157                 break;
 158         default: CERROR("unknown transaction start op %d\n", op);
 159                 LBUG();
 160         }
 161
 162         LASSERT(current->journal_info == desc_private);
 163         journal = EXT3_SB(inode->i_sb)->s_journal;
 164         if (nblocks > journal->j_max_transaction_buffers) {
 165                 CERROR("too many credits %d for op %ux%u using %d instead\n",
 166                        nblocks, op, logs, journal->j_max_transaction_buffers);
 167                 nblocks = journal->j_max_transaction_buffers;
 168         }
 169
 170  journal_start:
 171         LASSERTF(nblocks > 0, "can't start %d credit transaction\n", nblocks);
 172         lock_24kernel();
 173         handle = journal_start(EXT3_JOURNAL(inode), nblocks);
 174         unlock_24kernel();
 175
 176         if (!IS_ERR(handle))
 177                 LASSERT(current->journal_info == handle);
 178         else
 179                 CERROR("error starting handle for op %u (%u credits): rc %ld\n",
 180                        op, nblocks, PTR_ERR(handle));
 181         return handle;
 182 }
 183
 184 /*
 185  * Calculate the number of buffer credits needed to write multiple pages in
 186  * a single ext3 transaction.  No, this shouldn't be here, but as yet ext3
 187  * doesn't have a nice API for calculating this sort of thing in advance.
 188  *
 189  * See comment above ext3_writepage_trans_blocks for details.  We assume
 190  * no data journaling is being done, but it does allow for all of the pages
 191  * being non-contiguous.  If we are guaranteed contiguous pages we could
 192  * reduce the number of (d)indirect blocks a lot.
 193  *
 194  * With N blocks per page and P pages, for each inode we have at most:
 195  * N*P indirect
 196  * min(N*P, blocksize/4 + 1) dindirect blocks
 197  * niocount tindirect
 198  *
 199  * For the entire filesystem, we have at most:
 200  * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
 201  * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
 202  * objcount inode blocks
 203  * 1 superblock
 204  * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
 205  *
 206  * 1 EXT3_DATA_TRANS_BLOCKS for the last_rcvd update.
 207  */
 208 static int fsfilt_ext3_credits_needed(int objcount, struct fsfilt_objinfo *fso,
 209                                       int niocount, struct niobuf_local *nb)
 210 {
 211         struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
 212         __u64 next_indir;
 213         const int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
 214         int nbitmaps = 0, ngdblocks;
 215         int needed = objcount + 1; /* inodes + superblock */
 216         int i, j;
 217
 218         for (i = 0, j = 0; i < objcount; i++, fso++) {
 219                 /* two or more dindirect blocks in case we cross boundary */
 220                 int ndind = (long)((nb[j + fso->fso_bufcnt - 1].offset -
 221                                     nb[j].offset) >>
 222                                    sb->s_blocksize_bits) /
 223                         (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb));
 224                 nbitmaps += min(fso->fso_bufcnt, ndind > 0 ? ndind : 2);
 225
 226                 /* leaf, indirect, tindirect blocks for first block */
 227                 nbitmaps += blockpp + 2;
 228
 229                 j += fso->fso_bufcnt;
 230         }
 231
 232         next_indir = nb[0].offset +
 233                 (EXT3_ADDR_PER_BLOCK(sb) << sb->s_blocksize_bits);
 234         for (i = 1; i < niocount; i++) {
 235                 if (nb[i].offset >= next_indir) {
 236                         nbitmaps++;     /* additional indirect */
 237                         next_indir = nb[i].offset +
 238                                 (EXT3_ADDR_PER_BLOCK(sb)<<sb->s_blocksize_bits);
 239                 } else if (nb[i].offset != nb[i - 1].offset + sb->s_blocksize) {
 240                         nbitmaps++;     /* additional indirect */
 241                 }
 242                 nbitmaps += blockpp;    /* each leaf in different group? */
 243         }
 244
 245         ngdblocks = nbitmaps;
 246         if (nbitmaps > EXT3_SB(sb)->s_groups_count)
 247                 nbitmaps = EXT3_SB(sb)->s_groups_count;
 248         if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
 249                 ngdblocks = EXT3_SB(sb)->s_gdb_count;
 250
 251         needed += nbitmaps + ngdblocks;
 252
 253         /* last_rcvd update */
 254         needed += EXT3_DATA_TRANS_BLOCKS;
 255
 256 #if defined(CONFIG_QUOTA)
 257         /* We assume that there will be 1 bit set in s_dquot.flags for each
 258          * quota file that is active.  This is at least true for now.
 259          */
 260         needed += hweight32(sb_any_quota_enabled(sb)) *
 261                 EXT3_SINGLEDATA_TRANS_BLOCKS;
 262 #endif
 263
 264         return needed;
 265 }
 266
 267 /* We have to start a huge journal transaction here to hold all of the
 268  * metadata for the pages being written here.  This is necessitated by
 269  * the fact that we do lots of prepare_write operations before we do
 270  * any of the matching commit_write operations, so even if we split
 271  * up to use "smaller" transactions none of them could complete until
 272  * all of them were opened.  By having a single journal transaction,
 273  * we eliminate duplicate reservations for common blocks like the
 274  * superblock and group descriptors or bitmaps.
 275  *
 276  * We will start the transaction here, but each prepare_write will
 277  * add a refcount to the transaction, and each commit_write will
 278  * remove a refcount.  The transaction will be closed when all of
 279  * the pages have been written.
 280  */
 281 static void *fsfilt_ext3_brw_start(int objcount, struct fsfilt_objinfo *fso,
 282                                    int niocount, struct niobuf_local *nb,
 283                                    void *desc_private, int logs)
 284 {
 285         journal_t *journal;
 286         handle_t *handle;
 287         int needed;
 288         ENTRY;
 289
 290         LASSERT(current->journal_info == desc_private);
 291         journal = EXT3_SB(fso->fso_dentry->d_inode->i_sb)->s_journal;
 292         needed = fsfilt_ext3_credits_needed(objcount, fso, niocount, nb);
 293
 294         /* The number of blocks we could _possibly_ dirty can very large.
 295          * We reduce our request if it is absurd (and we couldn't get that
 296          * many credits for a single handle anyways).
 297          *
 298          * At some point we have to limit the size of I/Os sent at one time,
 299          * increase the size of the journal, or we have to calculate the
 300          * actual journal requirements more carefully by checking all of
 301          * the blocks instead of being maximally pessimistic.  It remains to
 302          * be seen if this is a real problem or not.
 303          */
 304         if (needed > journal->j_max_transaction_buffers) {
 305                 CERROR("want too many journal credits (%d) using %d instead\n",
 306                        needed, journal->j_max_transaction_buffers);
 307                 needed = journal->j_max_transaction_buffers;
 308         }
 309
 310         LASSERTF(needed > 0, "can't start %d credit transaction\n", needed);
 311         lock_24kernel();
 312         handle = journal_start(journal, needed);
 313         unlock_24kernel();
 314         if (IS_ERR(handle)) {
 315                 CERROR("can't get handle for %d credits: rc = %ld\n", needed,
 316                        PTR_ERR(handle));
 317         } else {
 318                 LASSERT(handle->h_buffer_credits >= needed);
 319                 LASSERT(current->journal_info == handle);
 320         }
 321
 322         RETURN(handle);
 323 }
 324
 325 static int fsfilt_ext3_commit(struct inode *inode, void *h, int force_sync)
 326 {
 327         int rc;
 328         handle_t *handle = h;
 329
 330         LASSERT(current->journal_info == handle);
 331         if (force_sync)
 332                 handle->h_sync = 1; /* recovery likes this */
 333
 334         lock_24kernel();
 335         rc = journal_stop(handle);
 336         unlock_24kernel();
 337
 338         return rc;
 339 }
 340
 341 static int fsfilt_ext3_commit_async(struct inode *inode, void *h,
 342                                     void **wait_handle)
 343 {
 344         unsigned long tid;
 345         transaction_t *transaction;
 346 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 347         unsigned long rtid;
 348 #endif
 349         handle_t *handle = h;
 350         journal_t *journal;
 351         int rc;
 352
 353         LASSERT(current->journal_info == handle);
 354
 355         lock_kernel();
 356         transaction = handle->h_transaction;
 357         journal = transaction->t_journal;
 358         tid = transaction->t_tid;
 359         /* we don't want to be blocked */
 360         handle->h_sync = 0;
 361         rc = journal_stop(handle);
 362         if (rc) {
 363                 CERROR("error while stopping transaction: %d\n", rc);
 364                 unlock_kernel();
 365                 return rc;
 366         }
 367 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 368         rtid = log_start_commit(journal, transaction);
 369         if (rtid != tid)
 370                 CERROR("strange race: %lu != %lu\n",
 371                        (unsigned long) tid, (unsigned long) rtid);
 372 #else
 373         log_start_commit(journal, transaction->t_tid);
 374 #endif
 375         unlock_kernel();
 376
 377         *wait_handle = (void *) tid;
 378         CDEBUG(D_INODE, "commit async: %lu\n", (unsigned long) tid);
 379         return 0;
 380 }
 381
 382 static int fsfilt_ext3_commit_wait(struct inode *inode, void *h)
 383 {
 384         tid_t tid = (tid_t)(long)h;
 385
 386         CDEBUG(D_INODE, "commit wait: %lu\n", (unsigned long) tid);
 387         if (is_journal_aborted(EXT3_JOURNAL(inode)))
 388                 return -EIO;
 389
 390         log_wait_commit(EXT3_JOURNAL(inode), tid);
 391
 392         return 0;
 393 }
 394
 395 static int fsfilt_ext3_setattr(struct dentry *dentry, void *handle,
 396                                struct iattr *iattr, int do_trunc)
 397 {
 398         struct inode *inode = dentry->d_inode;
 399         int rc;
 400
 401         lock_kernel();
 402
 403         /* A _really_ horrible hack to avoid removing the data stored
 404          * in the block pointers; this is really the "small" stripe MD data.
 405          * We can avoid further hackery by virtue of the MDS file size being
 406          * zero all the time (which doesn't invoke block truncate at unlink
 407          * time), so we assert we never change the MDS file size from zero. */
 408         if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
 409                 /* ATTR_SIZE would invoke truncate: clear it */
 410                 iattr->ia_valid &= ~ATTR_SIZE;
 411                 EXT3_I(inode)->i_disksize = inode->i_size = iattr->ia_size;
 412
 413                 /* make sure _something_ gets set - so new inode
 414                  * goes to disk (probably won't work over XFS */
 415                 if (!(iattr->ia_valid & (ATTR_MODE | ATTR_MTIME | ATTR_CTIME))){
 416                         iattr->ia_valid |= ATTR_MODE;
 417                         iattr->ia_mode = inode->i_mode;
 418                 }
 419         }
 420
 421         /* Don't allow setattr to change file type */
 422         iattr->ia_mode = (inode->i_mode & S_IFMT)|(iattr->ia_mode & ~S_IFMT);
 423
 424         /* We set these flags on the client, but have already checked perms
 425          * so don't confuse inode_change_ok. */
 426         iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
 427
 428         if (inode->i_op->setattr) {
 429                 rc = inode->i_op->setattr(dentry, iattr);
 430         } else {
 431                 rc = inode_change_ok(inode, iattr);
 432                 if (!rc)
 433                         rc = inode_setattr(inode, iattr);
 434         }
 435
 436         unlock_kernel();
 437
 438         return rc;
 439 }
 440
 441 static int fsfilt_ext3_iocontrol(struct inode * inode, struct file *file,
 442                                  unsigned int cmd, unsigned long arg)
 443 {
 444         int rc = 0;
 445         ENTRY;
 446
 447         if (inode->i_fop->ioctl)
 448                 rc = inode->i_fop->ioctl(inode, file, cmd, arg);
 449         else
 450                 RETURN(-ENOTTY);
 451
 452         RETURN(rc);
 453 }
 454
 455 static int fsfilt_ext3_set_md(struct inode *inode, void *handle,
 456                               void *lmm, int lmm_size)
 457 {
 458         int rc;
 459
 460         LASSERT(down_trylock(&inode->i_sem) != 0);
 461
 462         if (EXT3_I(inode)->i_file_acl /* || large inode EA flag */)
 463                 CWARN("setting EA on %lu/%u again... interesting\n",
 464                        inode->i_ino, inode->i_generation);
 465
 466         lock_kernel();
 467         rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
 468                                    XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size, 0);
 469
 470         unlock_kernel();
 471
 472         if (rc)
 473                 CERROR("error adding MD data to inode %lu: rc = %d\n",
 474                        inode->i_ino, rc);
 475         return rc;
 476 }
 477
 478 /* Must be called with i_sem held */
 479 static int fsfilt_ext3_get_md(struct inode *inode, void *lmm, int lmm_size)
 480 {
 481         int rc;
 482
 483         LASSERT(down_trylock(&inode->i_sem) != 0);
 484         lock_kernel();
 485
 486         rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
 487                             XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size);
 488         unlock_kernel();
 489
 490         /* This gives us the MD size */
 491         if (lmm == NULL)
 492                 return (rc == -ENODATA) ? 0 : rc;
 493
 494         if (rc < 0) {
 495                 CDEBUG(D_INFO, "error getting EA %d/%s from inode %lu: rc %d\n",
 496                        EXT3_XATTR_INDEX_TRUSTED, XATTR_LUSTRE_MDS_LOV_EA,
 497                        inode->i_ino, rc);
 498                 memset(lmm, 0, lmm_size);
 499                 return (rc == -ENODATA) ? 0 : rc;
 500         }
 501
 502         return rc;
 503 }
 504
 505 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 506 static int fsfilt_ext3_send_bio(int rw, struct inode *inode, struct bio *bio)
 507 {
 508         submit_bio(rw, bio);
 509         return 0;
 510 }
 511 #else
 512 static int fsfilt_ext3_send_bio(int rw, struct inode *inode, struct kiobuf *bio)
 513 {
 514         int rc, blocks_per_page;
 515
 516         rc = brw_kiovec(rw, 1, &bio, inode->i_dev,
 517                         KIOBUF_GET_BLOCKS(bio), 1 << inode->i_blkbits);
 518
 519         blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 520
 521         if (rc != (1 << inode->i_blkbits) * bio->nr_pages * blocks_per_page) {
 522                 CERROR("short write?  expected %d, wrote %d\n",
 523                        (1 << inode->i_blkbits) * bio->nr_pages *
 524                        blocks_per_page, rc);
 525         }
 526
 527         return rc;
 528 }
 529 #endif
 530
 531 static ssize_t fsfilt_ext3_readpage(struct file *file, char *buf, size_t count,
 532                                     loff_t *off)
 533 {
 534         struct inode *inode = file->f_dentry->d_inode;
 535         int rc = 0;
 536
 537         if (S_ISREG(inode->i_mode))
 538                 rc = file->f_op->read(file, buf, count, off);
 539         else {
 540                 const int blkbits = inode->i_sb->s_blocksize_bits;
 541                 const int blksize = inode->i_sb->s_blocksize;
 542
 543                 CDEBUG(D_EXT2, "reading "LPSZ" at dir %lu+%llu\n",
 544                        count, inode->i_ino, *off);
 545                 while (count > 0) {
 546                         struct buffer_head *bh;
 547
 548                         bh = NULL;
 549                         if (*off < inode->i_size) {
 550                                 int err = 0;
 551
 552                                 bh = ext3_bread(NULL, inode, *off >> blkbits,
 553                                                 0, &err);
 554
 555                                 CDEBUG(D_EXT2, "read %u@%llu\n", blksize, *off);
 556
 557                                 if (bh) {
 558                                         memcpy(buf, bh->b_data, blksize);
 559                                         brelse(bh);
 560                                 } else if (err) {
 561                                         /* XXX in theory we should just fake
 562                                          * this buffer and continue like ext3,
 563                                          * especially if this is a partial read
 564                                          */
 565                                         CERROR("error read dir %lu+%llu: %d\n",
 566                                                inode->i_ino, *off, err);
 567                                         RETURN(err);
 568                                 }
 569                         }
 570                         if (!bh) {
 571                                 struct ext3_dir_entry_2 *fake = (void *)buf;
 572
 573                                 CDEBUG(D_EXT2, "fake %u@%llu\n", blksize, *off);
 574                                 memset(fake, 0, sizeof(*fake));
 575                                 fake->rec_len = cpu_to_le32(blksize);
 576                         }
 577                         count -= blksize;
 578                         buf += blksize;
 579                         *off += blksize;
 580                         rc += blksize;
 581                 }
 582         }
 583
 584         return rc;
 585 }
 586
 587 static void fsfilt_ext3_cb_func(struct journal_callback *jcb, int error)
 588 {
 589         struct fsfilt_cb_data *fcb = (struct fsfilt_cb_data *)jcb;
 590
 591         fcb->cb_func(fcb->cb_obd, fcb->cb_last_rcvd, fcb->cb_data, error);
 592
 593         OBD_SLAB_FREE(fcb, fcb_cache, sizeof *fcb);
 594 }
 595
 596 static int fsfilt_ext3_add_journal_cb(struct obd_device *obd, __u64 last_rcvd,
 597                                       void *handle, fsfilt_cb_t cb_func,
 598                                       void *cb_data)
 599 {
 600         struct fsfilt_cb_data *fcb;
 601
 602         OBD_SLAB_ALLOC(fcb, fcb_cache, GFP_NOFS, sizeof *fcb);
 603         if (fcb == NULL)
 604                 RETURN(-ENOMEM);
 605
 606         fcb->cb_func = cb_func;
 607         fcb->cb_obd = obd;
 608         fcb->cb_last_rcvd = last_rcvd;
 609         fcb->cb_data = cb_data;
 610
 611         CDEBUG(D_EXT2, "set callback for last_rcvd: "LPD64"\n", last_rcvd);
 612         lock_24kernel();
 613         journal_callback_set(handle, fsfilt_ext3_cb_func,
 614                              (struct journal_callback *)fcb);
 615         unlock_24kernel();
 616
 617         return 0;
 618 }
 619
 620 /*
 621  * We need to hack the return value for the free inode counts because
 622  * the current EA code requires one filesystem block per inode with EAs,
 623  * so it is possible to run out of blocks before we run out of inodes.
 624  *
 625  * This can be removed when the ext3 EA code is fixed.
 626  */
 627 static int fsfilt_ext3_statfs(struct super_block *sb, struct obd_statfs *osfs)
 628 {
 629         struct kstatfs sfs;
 630         int rc;
 631
 632         memset(&sfs, 0, sizeof(sfs));
 633
 634         rc = sb->s_op->statfs(sb, &sfs);
 635
 636         if (!rc && sfs.f_bfree < sfs.f_ffree) {
 637                 sfs.f_files = (sfs.f_files - sfs.f_ffree) + sfs.f_bfree;
 638                 sfs.f_ffree = sfs.f_bfree;
 639         }
 640
 641         statfs_pack(osfs, &sfs);
 642         return rc;
 643 }
 644
 645 static int fsfilt_ext3_sync(struct super_block *sb)
 646 {
 647         return ext3_force_commit(sb);
 648 }
 649
 650 #if defined(EXT3_MULTIBLOCK_ALLOCATOR) && (!defined(EXT3_EXT_CACHE_NO) || defined(EXT_CACHE_MARK))
 651 #warning "kernel code has old extents/mballoc patch, disabling"
 652 #undef EXT3_MULTIBLOCK_ALLOCATOR
 653 #endif
 654 #ifndef EXT3_EXTENTS_FL
 655 #define EXT3_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 656 #endif
 657
 658 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
 659 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 660 #define ext3_up_truncate_sem(inode)  up_write(&EXT3_I(inode)->truncate_sem);
 661 #define ext3_down_truncate_sem(inode)  down_write(&EXT3_I(inode)->truncate_sem);
 662 #else
 663 #define ext3_up_truncate_sem(inode)  up(&EXT3_I(inode)->truncate_sem);
 664 #define ext3_down_truncate_sem(inode)  down(&EXT3_I(inode)->truncate_sem);
 665 #endif
 666
 667 #include <linux/lustre_version.h>
 668 #if EXT3_EXT_MAGIC == 0xf301
 669 #define ee_start e_start
 670 #define ee_block e_block
 671 #define ee_len   e_num
 672 #endif
 673 #ifndef EXT3_BB_MAX_BLOCKS
 674 #define ext3_mb_new_blocks(handle, inode, goal, count, aflags, err) \
 675         ext3_new_blocks(handle, inode, count, goal, err)
 676 #endif
 677
 678 struct bpointers {
 679         unsigned long *blocks;
 680         int *created;
 681         unsigned long start;
 682         int num;
 683         int init_num;
 684         int create;
 685 };
 686
 687 static int ext3_ext_find_goal(struct inode *inode, struct ext3_ext_path *path,
 688                               unsigned long block, int *aflags)
 689 {
 690         struct ext3_inode_info *ei = EXT3_I(inode);
 691         unsigned long bg_start;
 692         unsigned long colour;
 693         int depth;
 694
 695         if (path) {
 696                 struct ext3_extent *ex;
 697                 depth = path->p_depth;
 698
 699                 /* try to predict block placement */
 700                 if ((ex = path[depth].p_ext)) {
 701 #if 0
 702                         /* This prefers to eat into a contiguous extent
 703                          * rather than find an extent that the whole
 704                          * request will fit into.  This can fragment data
 705                          * block allocation and prevents our lovely 1M I/Os
 706                          * from reaching the disk intact. */
 707                         if (ex->ee_block + ex->ee_len == block)
 708                                 *aflags |= 1;
 709 #endif
 710                         return ex->ee_start + (block - ex->ee_block);
 711                 }
 712
 713                 /* it looks index is empty
 714                  * try to find starting from index itself */
 715                 if (path[depth].p_bh)
 716                         return path[depth].p_bh->b_blocknr;
 717         }
 718
 719         /* OK. use inode's group */
 720         bg_start = (ei->i_block_group * EXT3_BLOCKS_PER_GROUP(inode->i_sb)) +
 721                 le32_to_cpu(EXT3_SB(inode->i_sb)->s_es->s_first_data_block);
 722         colour = (current->pid % 16) *
 723                 (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16);
 724         return bg_start + colour + block;
 725 }
 726
 727 static int ext3_ext_new_extent_cb(struct ext3_extents_tree *tree,
 728                                   struct ext3_ext_path *path,
 729                                   struct ext3_ext_cache *cex)
 730 {
 731         struct inode *inode = tree->inode;
 732         struct bpointers *bp = tree->private;
 733         struct ext3_extent nex;
 734         int count, err, goal;
 735         unsigned long pblock;
 736         unsigned long tgen;
 737         loff_t new_i_size;
 738         handle_t *handle;
 739         int i, aflags = 0;
 740
 741         i = EXT_DEPTH(tree);
 742         EXT_ASSERT(i == path->p_depth);
 743         EXT_ASSERT(path[i].p_hdr);
 744
 745         if (cex->ec_type == EXT3_EXT_CACHE_EXTENT) {
 746                 err = EXT_CONTINUE;
 747                 goto map;
 748         }
 749
 750         if (bp->create == 0) {
 751                 i = 0;
 752                 if (cex->ec_block < bp->start)
 753                         i = bp->start - cex->ec_block;
 754                 if (i >= cex->ec_len)
 755                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 756                                         i, cex->ec_len);
 757                 for (; i < cex->ec_len && bp->num; i++) {
 758                         *(bp->created) = 0;
 759                         bp->created++;
 760                         *(bp->blocks) = 0;
 761                         bp->blocks++;
 762                         bp->num--;
 763                         bp->start++;
 764                 }
 765
 766                 return EXT_CONTINUE;
 767         }
 768
 769         tgen = EXT_GENERATION(tree);
 770         count = ext3_ext_calc_credits_for_insert(tree, path);
 771         ext3_up_truncate_sem(inode);
 772
 773         lock_24kernel();
 774         handle = journal_start(EXT3_JOURNAL(inode), count+EXT3_ALLOC_NEEDED+1);
 775         unlock_24kernel();
 776         if (IS_ERR(handle)) {
 777                 ext3_down_truncate_sem(inode);
 778                 return PTR_ERR(handle);
 779         }
 780
 781         ext3_down_truncate_sem(inode);
 782         if (tgen != EXT_GENERATION(tree)) {
 783                 /* the tree has changed. so path can be invalid at moment */
 784                 lock_24kernel();
 785                 journal_stop(handle);
 786                 unlock_24kernel();
 787                 return EXT_REPEAT;
 788         }
 789
 790         count = cex->ec_len;
 791         goal = ext3_ext_find_goal(inode, path, cex->ec_block, &aflags);
 792         aflags |= 2; /* block have been already reserved */
 793         pblock = ext3_mb_new_blocks(handle, inode, goal, &count, aflags, &err);
 794         if (!pblock)
 795                 goto out;
 796         EXT_ASSERT(count <= cex->ec_len);
 797
 798         /* insert new extent */
 799         nex.ee_block = cex->ec_block;
 800         nex.ee_start = pblock;
 801         nex.ee_len = count;
 802         err = ext3_ext_insert_extent(handle, tree, path, &nex);
 803         if (err)
 804                 goto out;
 805
 806         /*
 807          * Putting len of the actual extent we just inserted,
 808          * we are asking ext3_ext_walk_space() to continue
 809          * scaning after that block
 810          */
 811         cex->ec_len = nex.ee_len;
 812         cex->ec_start = nex.ee_start;
 813         BUG_ON(nex.ee_len == 0);
 814         BUG_ON(nex.ee_block != cex->ec_block);
 815
 816         /* correct on-disk inode size */
 817         if (nex.ee_len > 0) {
 818                 new_i_size = (loff_t) nex.ee_block + nex.ee_len;
 819                 new_i_size = new_i_size << inode->i_blkbits;
 820                 if (new_i_size > EXT3_I(inode)->i_disksize) {
 821                         EXT3_I(inode)->i_disksize = new_i_size;
 822                         err = ext3_mark_inode_dirty(handle, inode);
 823                 }
 824         }
 825
 826 out:
 827         lock_24kernel();
 828         journal_stop(handle);
 829         unlock_24kernel();
 830 map:
 831         if (err >= 0) {
 832                 /* map blocks */
 833                 if (bp->num == 0) {
 834                         CERROR("hmm. why do we find this extent?\n");
 835                         CERROR("initial space: %lu:%u\n",
 836                                 bp->start, bp->init_num);
 837                         CERROR("current extent: %u/%u/%u %d\n",
 838                                 cex->ec_block, cex->ec_len,
 839                                 cex->ec_start, cex->ec_type);
 840                 }
 841                 i = 0;
 842                 if (cex->ec_block < bp->start)
 843                         i = bp->start - cex->ec_block;
 844                 if (i >= cex->ec_len)
 845                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 846                                         i, cex->ec_len);
 847                 for (; i < cex->ec_len && bp->num; i++) {
 848                         if (cex->ec_type == EXT3_EXT_CACHE_EXTENT)
 849                                 *(bp->created) = 0;
 850                         else
 851                                 *(bp->created) = 1;
 852                         bp->created++;
 853                         *(bp->blocks) = cex->ec_start + i;
 854                         bp->blocks++;
 855                         bp->num--;
 856                         bp->start++;
 857                 }
 858         }
 859         return err;
 860 }
 861
 862 int fsfilt_map_nblocks(struct inode *inode, unsigned long block,
 863                        unsigned long num, unsigned long *blocks,
 864                        int *created, int create)
 865 {
 866         struct ext3_extents_tree tree;
 867         struct bpointers bp;
 868         int err;
 869
 870         CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
 871                 block, block + num, (unsigned) inode->i_ino);
 872
 873         ext3_init_tree_desc(&tree, inode);
 874         tree.private = &bp;
 875         bp.blocks = blocks;
 876         bp.created = created;
 877         bp.start = block;
 878         bp.init_num = bp.num = num;
 879         bp.create = create;
 880
 881         ext3_down_truncate_sem(inode);
 882         err = ext3_ext_walk_space(&tree, block, num, ext3_ext_new_extent_cb);
 883         ext3_ext_invalidate_cache(&tree);
 884         ext3_up_truncate_sem(inode);
 885
 886         return err;
 887 }
 888
 889 int fsfilt_ext3_map_ext_inode_pages(struct inode *inode, struct page **page,
 890                                     int pages, unsigned long *blocks,
 891                                     int *created, int create)
 892 {
 893         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 894         int rc = 0, i = 0;
 895         struct page *fp = NULL;
 896         int clen = 0;
 897
 898         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
 899                 inode->i_ino, pages, (*page)->index);
 900
 901         /* pages are sorted already. so, we just have to find
 902          * contig. space and process them properly */
 903         while (i < pages) {
 904                 if (fp == NULL) {
 905                         /* start new extent */
 906                         fp = *page++;
 907                         clen = 1;
 908                         i++;
 909                         continue;
 910                 } else if (fp->index + clen == (*page)->index) {
 911                         /* continue the extent */
 912                         page++;
 913                         clen++;
 914                         i++;
 915                         continue;
 916                 }
 917
 918                 /* process found extent */
 919                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
 920                                         clen * blocks_per_page, blocks,
 921                                         created, create);
 922                 if (rc)
 923                         GOTO(cleanup, rc);
 924
 925                 /* look for next extent */
 926                 fp = NULL;
 927                 blocks += blocks_per_page * clen;
 928                 created += blocks_per_page * clen;
 929         }
 930
 931         if (fp)
 932                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
 933                                         clen * blocks_per_page, blocks,
 934                                         created, create);
 935 cleanup:
 936         return rc;
 937 }
 938 #endif
 939
 940 extern int ext3_map_inode_page(struct inode *inode, struct page *page,
 941                                unsigned long *blocks, int *created, int create);
 942 int fsfilt_ext3_map_bm_inode_pages(struct inode *inode, struct page **page,
 943                                    int pages, unsigned long *blocks,
 944                                    int *created, int create)
 945 {
 946         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 947         unsigned long *b;
 948         int rc = 0, i, *cr;
 949
 950         for (i = 0, cr = created, b = blocks; i < pages; i++, page++) {
 951                 rc = ext3_map_inode_page(inode, *page, b, cr, create);
 952                 if (rc) {
 953                         CERROR("ino %lu, blk %lu cr %u create %d: rc %d\n",
 954                                inode->i_ino, *b, *cr, create, rc);
 955                         break;
 956                 }
 957
 958                 b += blocks_per_page;
 959                 cr += blocks_per_page;
 960         }
 961         return rc;
 962 }
 963
 964 int fsfilt_ext3_map_inode_pages(struct inode *inode, struct page **page,
 965                                 int pages, unsigned long *blocks,
 966                                 int *created, int create,
 967                                 struct semaphore *optional_sem)
 968 {
 969         int rc;
 970 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
 971         if (EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL) {
 972                 rc = fsfilt_ext3_map_ext_inode_pages(inode, page, pages,
 973                                                      blocks, created, create);
 974                 return rc;
 975         }
 976 #endif
 977         if (optional_sem != NULL)
 978                 down(optional_sem);
 979         rc = fsfilt_ext3_map_bm_inode_pages(inode, page, pages, blocks,
 980                                             created, create);
 981         if (optional_sem != NULL)
 982                 up(optional_sem);
 983
 984         return rc;
 985 }
 986
 987 extern int ext3_prep_san_write(struct inode *inode, long *blocks,
 988                                int nblocks, loff_t newsize);
 989 static int fsfilt_ext3_prep_san_write(struct inode *inode, long *blocks,
 990                                       int nblocks, loff_t newsize)
 991 {
 992         return ext3_prep_san_write(inode, blocks, nblocks, newsize);
 993 }
 994
 995 static int fsfilt_ext3_read_record(struct file * file, void *buf,
 996                                    int size, loff_t *offs)
 997 {
 998         struct inode *inode = file->f_dentry->d_inode;
 999         unsigned long block;
1000         struct buffer_head *bh;
1001         int err, blocksize, csize, boffs;
1002
1003         /* prevent reading after eof */
1004         lock_kernel();
1005         if (inode->i_size < *offs + size) {
1006                 size = inode->i_size - *offs;
1007                 unlock_kernel();
1008                 if (size < 0) {
1009                         CERROR("size %llu is too short for read %u@%llu\n",
1010                                inode->i_size, size, *offs);
1011                         return -EIO;
1012                 } else if (size == 0) {
1013                         return 0;
1014                 }
1015         } else {
1016                 unlock_kernel();
1017         }
1018
1019         blocksize = 1 << inode->i_blkbits;
1020
1021         while (size > 0) {
1022                 block = *offs >> inode->i_blkbits;
1023                 boffs = *offs & (blocksize - 1);
1024                 csize = min(blocksize - boffs, size);
1025                 bh = ext3_bread(NULL, inode, block, 0, &err);
1026                 if (!bh) {
1027                         CERROR("can't read block: %d\n", err);
1028                         return err;
1029                 }
1030
1031                 memcpy(buf, bh->b_data + boffs, csize);
1032                 brelse(bh);
1033
1034                 *offs += csize;
1035                 buf += csize;
1036                 size -= csize;
1037         }
1038         return 0;
1039 }
1040
1041 static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
1042                                     loff_t *offs, int force_sync)
1043 {
1044         struct buffer_head *bh = NULL;
1045         unsigned long block;
1046         struct inode *inode = file->f_dentry->d_inode;
1047         loff_t old_size = inode->i_size, offset = *offs;
1048         loff_t new_size = inode->i_size;
1049         journal_t *journal;
1050         handle_t *handle;
1051         int err, block_count = 0, blocksize, size, boffs;
1052
1053         /* Determine how many transaction credits are needed */
1054         blocksize = 1 << inode->i_blkbits;
1055         block_count = (*offs & (blocksize - 1)) + bufsize;
1056         block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
1057
1058         journal = EXT3_SB(inode->i_sb)->s_journal;
1059         lock_24kernel();
1060         handle = journal_start(journal,
1061                                block_count * EXT3_DATA_TRANS_BLOCKS + 2);
1062         unlock_24kernel();
1063         if (IS_ERR(handle)) {
1064                 CERROR("can't start transaction\n");
1065                 return PTR_ERR(handle);
1066         }
1067
1068         while (bufsize > 0) {
1069                 if (bh != NULL)
1070                         brelse(bh);
1071
1072                 block = offset >> inode->i_blkbits;
1073                 boffs = offset & (blocksize - 1);
1074                 size = min(blocksize - boffs, bufsize);
1075                 bh = ext3_bread(handle, inode, block, 1, &err);
1076                 if (!bh) {
1077                         CERROR("can't read/create block: %d\n", err);
1078                         goto out;
1079                 }
1080
1081                 err = ext3_journal_get_write_access(handle, bh);
1082                 if (err) {
1083                         CERROR("journal_get_write_access() returned error %d\n",
1084                                err);
1085                         goto out;
1086                 }
1087                 LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
1088                 memcpy(bh->b_data + boffs, buf, size);
1089                 err = ext3_journal_dirty_metadata(handle, bh);
1090                 if (err) {
1091                         CERROR("journal_dirty_metadata() returned error %d\n",
1092                                err);
1093                         goto out;
1094                 }
1095                 if (offset + size > new_size)
1096                         new_size = offset + size;
1097                 offset += size;
1098                 bufsize -= size;
1099                 buf += size;
1100         }
1101
1102         if (force_sync)
1103                 handle->h_sync = 1; /* recovery likes this */
1104 out:
1105         if (bh)
1106                 brelse(bh);
1107
1108         /* correct in-core and on-disk sizes */
1109         if (new_size > inode->i_size) {
1110                 lock_kernel();
1111                 if (new_size > inode->i_size)
1112                         inode->i_size = new_size;
1113                 if (inode->i_size > EXT3_I(inode)->i_disksize)
1114                         EXT3_I(inode)->i_disksize = inode->i_size;
1115                 if (inode->i_size > old_size)
1116                         mark_inode_dirty(inode);
1117                 unlock_kernel();
1118         }
1119
1120         lock_24kernel();
1121         journal_stop(handle);
1122         unlock_24kernel();
1123
1124         if (err == 0)
1125                 *offs = offset;
1126         return err;
1127 }
1128
1129 static int fsfilt_ext3_setup(struct super_block *sb)
1130 {
1131 #if 0
1132         EXT3_SB(sb)->dx_lock = fsfilt_ext3_dx_lock;
1133         EXT3_SB(sb)->dx_unlock = fsfilt_ext3_dx_unlock;
1134 #endif
1135 #ifdef S_PDIROPS
1136         CWARN("Enabling PDIROPS\n");
1137         set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
1138         sb->s_flags |= S_PDIROPS;
1139 #endif
1140         return 0;
1141 }
1142
1143 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
1144    objects. Logs is number of logfiles to update */
1145 static int fsfilt_ext3_get_op_len(int op, struct fsfilt_objinfo *fso, int logs)
1146 {
1147         if ( !fso ) {
1148                 switch(op) {
1149                 case FSFILT_OP_CREATE:
1150                                  /* directory leaf, index & indirect & EA*/
1151                         return 4 + 3 * logs;
1152                 case FSFILT_OP_UNLINK:
1153                         return 3 * logs;
1154                 }
1155         } else {
1156                 int i;
1157                 int needed = 0;
1158                 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
1159                 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
1160                 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
1161                 for (i = 0; i < op; i++, fso++) {
1162                         int nblocks = fso->fso_bufcnt * blockpp;
1163                         int ndindirect = min(nblocks, addrpp + 1);
1164                         int nindir = nblocks + ndindirect + 1;
1165
1166                         needed += nindir;
1167                 }
1168                 return needed + 3 * logs;
1169         }
1170
1171         return 0;
1172 }
1173
1174 static struct fsfilt_operations fsfilt_ext3_ops = {
1175         .fs_type                = "ext3",
1176         .fs_owner               = THIS_MODULE,
1177         .fs_start               = fsfilt_ext3_start,
1178         .fs_brw_start           = fsfilt_ext3_brw_start,
1179         .fs_commit              = fsfilt_ext3_commit,
1180         .fs_commit_async        = fsfilt_ext3_commit_async,
1181         .fs_commit_wait         = fsfilt_ext3_commit_wait,
1182         .fs_setattr             = fsfilt_ext3_setattr,
1183         .fs_iocontrol           = fsfilt_ext3_iocontrol,
1184         .fs_set_md              = fsfilt_ext3_set_md,
1185         .fs_get_md              = fsfilt_ext3_get_md,
1186         .fs_readpage            = fsfilt_ext3_readpage,
1187         .fs_add_journal_cb      = fsfilt_ext3_add_journal_cb,
1188         .fs_statfs              = fsfilt_ext3_statfs,
1189         .fs_sync                = fsfilt_ext3_sync,
1190         .fs_map_inode_pages     = fsfilt_ext3_map_inode_pages,
1191         .fs_prep_san_write      = fsfilt_ext3_prep_san_write,
1192         .fs_write_record        = fsfilt_ext3_write_record,
1193         .fs_read_record         = fsfilt_ext3_read_record,
1194         .fs_setup               = fsfilt_ext3_setup,
1195         .fs_send_bio            = fsfilt_ext3_send_bio,
1196         .fs_get_op_len          = fsfilt_ext3_get_op_len,
1197 };
1198
1199 static int __init fsfilt_ext3_init(void)
1200 {
1201         int rc;
1202
1203         fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
1204                                       sizeof(struct fsfilt_cb_data), 0,
1205                                       0, NULL, NULL);
1206         if (!fcb_cache) {
1207                 CERROR("error allocating fsfilt journal callback cache\n");
1208                 GOTO(out, rc = -ENOMEM);
1209         }
1210
1211         rc = fsfilt_register_ops(&fsfilt_ext3_ops);
1212
1213         if (rc)
1214                 kmem_cache_destroy(fcb_cache);
1215 out:
1216         return rc;
1217 }
1218
1219 static void __exit fsfilt_ext3_exit(void)
1220 {
1221         fsfilt_unregister_ops(&fsfilt_ext3_ops);
1222         LASSERT(kmem_cache_destroy(fcb_cache) == 0);
1223 }
1224
1225 module_init(fsfilt_ext3_init);
1226 module_exit(fsfilt_ext3_exit);
1227
1228 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1229 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
1230 MODULE_LICENSE("GPL");