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/ext3_extents.h>
  38 #include <linux/version.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/module.h>
  51 #include <linux/iobuf.h>
  52 #endif
  53
  54
  55 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,7))
  56 # define lock_24kernel() lock_kernel()
  57 # define unlock_24kernel() unlock_kernel()
  58 #else
  59 # define lock_24kernel() do {} while (0)
  60 # define unlock_24kernel() do {} while (0)
  61 #endif
  62
  63 static kmem_cache_t *fcb_cache;
  64 static atomic_t fcb_cache_count = ATOMIC_INIT(0);
  65
  66 struct fsfilt_cb_data {
  67         struct journal_callback cb_jcb; /* jbd private data - MUST BE FIRST */
  68         fsfilt_cb_t cb_func;            /* MDS/OBD completion function */
  69         struct obd_device *cb_obd;      /* MDS/OBD completion device */
  70         __u64 cb_last_num;              /* MDS/OST last committed operation */
  71         void *cb_data;                  /* MDS/OST completion function data */
  72 };
  73
  74 #ifndef EXT3_XATTR_INDEX_TRUSTED        /* temporary until we hit l28 kernel */
  75 #define EXT3_XATTR_INDEX_TRUSTED        4
  76 #endif
  77
  78 #define XATTR_LUSTRE_MDS_LOV_EA         "lov"
  79 #define XATTR_LUSTRE_MDS_MEA_EA         "mea"
  80 #define XATTR_LUSTRE_MDS_MID_EA         "mid"
  81 #define XATTR_LUSTRE_MDS_SID_EA         "sid"
  82 #define XATTR_LUSTRE_MDS_PID_EA         "pid"
  83 #define XATTR_LUSTRE_MDS_KEY_EA         "key"
  84
  85 /*
  86  * We don't currently need any additional blocks for rmdir and
  87  * unlink transactions because we are storing the OST oa_id inside
  88  * the inode (which we will be changing anyways as part of this
  89  * transaction).
  90  */
  91 static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
  92                                int logs)
  93 {
  94         /* For updates to the last recieved file */
  95         int nblocks = EXT3_SINGLEDATA_TRANS_BLOCKS;
  96         journal_t *journal;
  97         void *handle;
  98
  99         if (current->journal_info) {
 100                 CDEBUG(D_INODE, "increasing refcount on %p\n",
 101                        current->journal_info);
 102                 goto journal_start;
 103         }
 104
 105         if (logs)
 106                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 107                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 108
 109         switch(op) {
 110         case FSFILT_OP_RMDIR:
 111         case FSFILT_OP_UNLINK:
 112                 /* delete one file + create/update logs for each stripe */
 113                 nblocks += EXT3_DELETE_TRANS_BLOCKS;
 114                 /*nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 115                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;*/
 116                 break;
 117         case FSFILT_OP_RENAME:
 118                 /* modify additional directory */
 119                 nblocks += EXT3_SINGLEDATA_TRANS_BLOCKS;
 120                 /* no break */
 121         case FSFILT_OP_SYMLINK:
 122                 /* additional block + block bitmap + GDT for long symlink */
 123                 nblocks += 3;
 124                 /* no break */
 125         case FSFILT_OP_CREATE:
 126                 /* create/update logs for each stripe */
 127                 /*nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 128                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;*/
 129                 /* no break */
 130         case FSFILT_OP_MKDIR:
 131         case FSFILT_OP_MKNOD:
 132                 /* modify one inode + block bitmap + GDT */
 133                 nblocks += 3;
 134                 /* no break */
 135         case FSFILT_OP_LINK:
 136                 /* modify parent directory */
 137                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 138                         EXT3_DATA_TRANS_BLOCKS;
 139                 break;
 140         case FSFILT_OP_SETATTR:
 141                 /* Setattr on inode */
 142                 nblocks += 1;
 143                 break;
 144         case FSFILT_OP_CANCEL_UNLINK:
 145                 /* blocks for log header bitmap update OR
 146                  * blocks for catalog header bitmap update + unlink of logs */
 147                 nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
 148                         EXT3_DELETE_TRANS_BLOCKS * logs;
 149                 break;
 150         case FSFILT_OP_NOOP:
 151                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
 152                 break;
 153         default: CERROR("unknown transaction start op %d\n", op);
 154                 LBUG();
 155         }
 156
 157         LASSERT(current->journal_info == desc_private);
 158         journal = EXT3_SB(inode->i_sb)->s_journal;
 159         if (nblocks > journal->j_max_transaction_buffers) {
 160                 CERROR("too many credits %d for op %ux%u using %d instead\n",
 161                        nblocks, op, logs, journal->j_max_transaction_buffers);
 162                 nblocks = journal->j_max_transaction_buffers;
 163         }
 164
 165  journal_start:
 166         LASSERTF(nblocks > 0, "can't start %d credit transaction\n", nblocks);
 167         lock_24kernel();
 168         handle = journal_start(EXT3_JOURNAL(inode), nblocks);
 169         unlock_24kernel();
 170
 171         if (!IS_ERR(handle))
 172                 LASSERT(current->journal_info == handle);
 173         else
 174                 CERROR("error starting handle for op %u (%u credits): rc %ld\n",
 175                        op, nblocks, PTR_ERR(handle));
 176         return handle;
 177 }
 178
 179 /*
 180  * Calculate the number of buffer credits needed to write multiple pages in
 181  * a single ext3 transaction.  No, this shouldn't be here, but as yet ext3
 182  * doesn't have a nice API for calculating this sort of thing in advance.
 183  *
 184  * See comment above ext3_writepage_trans_blocks for details.  We assume
 185  * no data journaling is being done, but it does allow for all of the pages
 186  * being non-contiguous.  If we are guaranteed contiguous pages we could
 187  * reduce the number of (d)indirect blocks a lot.
 188  *
 189  * With N blocks per page and P pages, for each inode we have at most:
 190  * N*P indirect
 191  * min(N*P, blocksize/4 + 1) dindirect blocks
 192  * niocount tindirect
 193  *
 194  * For the entire filesystem, we have at most:
 195  * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
 196  * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
 197  * objcount inode blocks
 198  * 1 superblock
 199  * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
 200  *
 201  * 1 EXT3_DATA_TRANS_BLOCKS for the last_rcvd update.
 202  */
 203 static int fsfilt_ext3_credits_needed(int objcount, struct fsfilt_objinfo *fso,
 204                                       int niocount, struct niobuf_local *nb)
 205 {
 206         struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
 207         __u64 next_indir;
 208         const int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
 209         int nbitmaps = 0, ngdblocks;
 210         int needed = objcount + 1; /* inodes + superblock */
 211         int i, j;
 212
 213         for (i = 0, j = 0; i < objcount; i++, fso++) {
 214                 /* two or more dindirect blocks in case we cross boundary */
 215                 int ndind = (long)((nb[j + fso->fso_bufcnt - 1].offset -
 216                                     nb[j].offset) >>
 217                                    sb->s_blocksize_bits) /
 218                         (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb));
 219                 nbitmaps += min(fso->fso_bufcnt, ndind > 0 ? ndind : 2);
 220
 221                 /* leaf, indirect, tindirect blocks for first block */
 222                 nbitmaps += blockpp + 2;
 223
 224                 j += fso->fso_bufcnt;
 225         }
 226
 227         next_indir = nb[0].offset +
 228                 (EXT3_ADDR_PER_BLOCK(sb) << sb->s_blocksize_bits);
 229         for (i = 1; i < niocount; i++) {
 230                 if (nb[i].offset >= next_indir) {
 231                         nbitmaps++;     /* additional indirect */
 232                         next_indir = nb[i].offset +
 233                                 (EXT3_ADDR_PER_BLOCK(sb)<<sb->s_blocksize_bits);
 234                 } else if (nb[i].offset != nb[i - 1].offset + sb->s_blocksize) {
 235                         nbitmaps++;     /* additional indirect */
 236                 }
 237                 nbitmaps += blockpp;    /* each leaf in different group? */
 238         }
 239
 240         ngdblocks = nbitmaps;
 241         if (nbitmaps > EXT3_SB(sb)->s_groups_count)
 242                 nbitmaps = EXT3_SB(sb)->s_groups_count;
 243         if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
 244                 ngdblocks = EXT3_SB(sb)->s_gdb_count;
 245
 246         needed += nbitmaps + ngdblocks;
 247
 248         /* last_rcvd update */
 249         needed += EXT3_DATA_TRANS_BLOCKS;
 250
 251 #if defined(CONFIG_QUOTA) && !defined(__x86_64__) /* XXX */
 252         /* We assume that there will be 1 bit set in s_dquot.flags for each
 253          * quota file that is active.  This is at least true for now.
 254          */
 255         needed += hweight32(sb_any_quota_enabled(sb)) *
 256                 EXT3_SINGLEDATA_TRANS_BLOCKS;
 257 #endif
 258
 259         return needed;
 260 }
 261
 262 /* We have to start a huge journal transaction here to hold all of the
 263  * metadata for the pages being written here.  This is necessitated by
 264  * the fact that we do lots of prepare_write operations before we do
 265  * any of the matching commit_write operations, so even if we split
 266  * up to use "smaller" transactions none of them could complete until
 267  * all of them were opened.  By having a single journal transaction,
 268  * we eliminate duplicate reservations for common blocks like the
 269  * superblock and group descriptors or bitmaps.
 270  *
 271  * We will start the transaction here, but each prepare_write will
 272  * add a refcount to the transaction, and each commit_write will
 273  * remove a refcount.  The transaction will be closed when all of
 274  * the pages have been written.
 275  */
 276 static void *fsfilt_ext3_brw_start(int objcount, struct fsfilt_objinfo *fso,
 277                                    int niocount, struct niobuf_local *nb,
 278                                    void *desc_private, int logs)
 279 {
 280         journal_t *journal;
 281         handle_t *handle;
 282         int needed;
 283         ENTRY;
 284
 285         LASSERT(current->journal_info == desc_private);
 286         journal = EXT3_SB(fso->fso_dentry->d_inode->i_sb)->s_journal;
 287         needed = fsfilt_ext3_credits_needed(objcount, fso, niocount, nb);
 288
 289         /* The number of blocks we could _possibly_ dirty can very large.
 290          * We reduce our request if it is absurd (and we couldn't get that
 291          * many credits for a single handle anyways).
 292          *
 293          * At some point we have to limit the size of I/Os sent at one time,
 294          * increase the size of the journal, or we have to calculate the
 295          * actual journal requirements more carefully by checking all of
 296          * the blocks instead of being maximally pessimistic.  It remains to
 297          * be seen if this is a real problem or not.
 298          */
 299         if (needed > journal->j_max_transaction_buffers) {
 300                 CERROR("want too many journal credits (%d) using %d instead\n",
 301                        needed, journal->j_max_transaction_buffers);
 302                 needed = journal->j_max_transaction_buffers;
 303         }
 304
 305         LASSERTF(needed > 0, "can't start %d credit transaction\n", needed);
 306         lock_24kernel();
 307         handle = journal_start(journal, needed);
 308         unlock_24kernel();
 309         if (IS_ERR(handle)) {
 310                 CERROR("can't get handle for %d credits: rc = %ld\n", needed,
 311                        PTR_ERR(handle));
 312         } else {
 313                 LASSERT(handle->h_buffer_credits >= needed);
 314                 LASSERT(current->journal_info == handle);
 315         }
 316
 317         RETURN(handle);
 318 }
 319
 320 static int fsfilt_ext3_commit(struct super_block *sb, struct inode *inode,
 321                               void *h, int force_sync)
 322 {
 323         int rc;
 324         handle_t *handle = h;
 325
 326         LASSERT(current->journal_info == handle);
 327         if (force_sync)
 328                 handle->h_sync = 1; /* recovery likes this */
 329
 330         lock_24kernel();
 331         rc = journal_stop(handle);
 332         unlock_24kernel();
 333
 334         return rc;
 335 }
 336
 337 static int fsfilt_ext3_commit_async(struct inode *inode, void *h,
 338                                     void **wait_handle)
 339 {
 340         unsigned long tid;
 341         transaction_t *transaction;
 342 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 343         unsigned long rtid;
 344 #endif
 345         handle_t *handle = h;
 346         journal_t *journal;
 347         int rc;
 348
 349         LASSERT(current->journal_info == handle);
 350
 351         lock_24kernel();
 352         transaction = handle->h_transaction;
 353         journal = transaction->t_journal;
 354         tid = transaction->t_tid;
 355         /* we don't want to be blocked */
 356         handle->h_sync = 0;
 357         rc = journal_stop(handle);
 358         if (rc) {
 359                 CERROR("error while stopping transaction: %d\n", rc);
 360                 unlock_kernel();
 361                 return rc;
 362         }
 363 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 364         rtid = log_start_commit(journal, transaction);
 365         if (rtid != tid)
 366                 CERROR("strange race: %lu != %lu\n",
 367                        (unsigned long) tid, (unsigned long) rtid);
 368 #else
 369         log_start_commit(journal, tid);
 370 #endif
 371         unlock_24kernel();
 372
 373         *wait_handle = (void *) tid;
 374         CDEBUG(D_INODE, "commit async: %lu\n", (unsigned long) tid);
 375         return 0;
 376 }
 377
 378 static int fsfilt_ext3_commit_wait(struct inode *inode, void *h)
 379 {
 380         tid_t tid = (tid_t)(long)h;
 381
 382         CDEBUG(D_INODE, "commit wait: %lu\n", (unsigned long) tid);
 383         if (is_journal_aborted(EXT3_JOURNAL(inode)))
 384                 return -EIO;
 385
 386         log_wait_commit(EXT3_JOURNAL(inode), tid);
 387
 388         return 0;
 389 }
 390
 391 static int fsfilt_ext3_setattr(struct dentry *dentry, void *handle,
 392                                struct iattr *iattr, int do_trunc)
 393 {
 394         struct inode *inode = dentry->d_inode;
 395         int rc;
 396
 397         lock_24kernel();
 398
 399         /* A _really_ horrible hack to avoid removing the data stored
 400          * in the block pointers; this is really the "small" stripe MD data.
 401          * We can avoid further hackery by virtue of the MDS file size being
 402          * zero all the time (which doesn't invoke block truncate at unlink
 403          * time), so we assert we never change the MDS file size from zero. */
 404         if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
 405                 /* ATTR_SIZE would invoke truncate: clear it */
 406                 iattr->ia_valid &= ~ATTR_SIZE;
 407                 EXT3_I(inode)->i_disksize = inode->i_size = iattr->ia_size;
 408
 409                 /* make sure _something_ gets set - so new inode
 410                  * goes to disk (probably won't work over XFS */
 411                 if (!(iattr->ia_valid & (ATTR_MODE | ATTR_MTIME | ATTR_CTIME))){
 412                         iattr->ia_valid |= ATTR_MODE;
 413                         iattr->ia_mode = inode->i_mode;
 414                 }
 415         }
 416
 417         /* Don't allow setattr to change file type */
 418         iattr->ia_mode = (inode->i_mode & S_IFMT)|(iattr->ia_mode & ~S_IFMT);
 419
 420         /* We set these flags on the client, but have already checked perms
 421          * so don't confuse inode_change_ok. */
 422         iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
 423
 424         if (inode->i_op->setattr) {
 425                 rc = inode->i_op->setattr(dentry, iattr);
 426         } else {
 427                 rc = inode_change_ok(inode, iattr);
 428                 if (!rc)
 429                         rc = inode_setattr(inode, iattr);
 430         }
 431
 432         unlock_24kernel();
 433
 434         return rc;
 435 }
 436
 437 static int fsfilt_ext3_iocontrol(struct inode * inode, struct file *file,
 438                                  unsigned int cmd, unsigned long arg)
 439 {
 440         int rc = 0;
 441         ENTRY;
 442
 443         if (inode->i_fop->ioctl)
 444                 rc = inode->i_fop->ioctl(inode, file, cmd, arg);
 445         else
 446                 RETURN(-ENOTTY);
 447
 448         RETURN(rc);
 449 }
 450
 451 static int fsfilt_ext3_set_xattr(struct inode * inode, void *handle, char *name,
 452                                  void *buffer, int buffer_size)
 453 {
 454         int rc = 0;
 455
 456         lock_24kernel();
 457
 458         rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
 459                                    name, buffer, buffer_size, 0);
 460         unlock_24kernel();
 461         if (rc)
 462                 CERROR("set xattr %s from inode %lu: rc %d\n",
 463                        name,  inode->i_ino, rc);
 464         return rc;
 465 }
 466
 467 static int fsfilt_ext3_get_xattr(struct inode *inode, char *name,
 468                                  void *buffer, int buffer_size)
 469 {
 470         int rc = 0;
 471
 472         lock_24kernel();
 473
 474         rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
 475                             name, buffer, buffer_size);
 476         unlock_24kernel();
 477
 478         if (buffer == NULL)
 479                 return (rc == -ENODATA) ? 0 : rc;
 480         if (rc < 0) {
 481                 CDEBUG(D_INFO, "error getting EA %s from inode %lu: rc %d\n",
 482                        name,  inode->i_ino, rc);
 483                 memset(buffer, 0, buffer_size);
 484                 return (rc == -ENODATA) ? 0 : rc;
 485         }
 486
 487         return rc;
 488 }
 489
 490 static int fsfilt_ext3_set_md(struct inode *inode, void *handle,
 491                               void *lmm, int lmm_size,
 492                               enum ea_type type)
 493 {
 494         int rc;
 495
 496         switch(type) {
 497         case EA_LOV:
 498                 rc = fsfilt_ext3_set_xattr(inode, handle,
 499                                            XATTR_LUSTRE_MDS_LOV_EA,
 500                                            lmm, lmm_size);
 501                 break;
 502         case EA_MEA:
 503                 rc = fsfilt_ext3_set_xattr(inode, handle,
 504                                            XATTR_LUSTRE_MDS_MEA_EA,
 505                                            lmm, lmm_size);
 506                 break;
 507         case EA_SID:
 508                 rc = fsfilt_ext3_set_xattr(inode, handle,
 509                                            XATTR_LUSTRE_MDS_SID_EA,
 510                                            lmm, lmm_size);
 511                 break;
 512         case EA_MID:
 513                 rc = fsfilt_ext3_set_xattr(inode, handle,
 514                                            XATTR_LUSTRE_MDS_MID_EA,
 515                                            lmm, lmm_size);
 516                 break;
 517         case EA_PID:
 518                  rc = fsfilt_ext3_set_xattr(inode, handle,
 519                                             XATTR_LUSTRE_MDS_PID_EA,
 520                                             lmm, lmm_size);
 521                 break;
 522         case EA_KEY:
 523                 rc = fsfilt_ext3_set_xattr(inode, handle,
 524                                            XATTR_LUSTRE_MDS_KEY_EA,
 525                                            lmm, lmm_size);
 526                 break;
 527         default:
 528                 return -EINVAL;
 529         }
 530
 531         return rc;
 532 }
 533
 534 static int fsfilt_ext3_get_md(struct inode *inode, void *lmm,
 535                               int lmm_size, enum ea_type type)
 536 {
 537         int rc;
 538
 539         switch (type) {
 540         case EA_LOV:
 541                 rc = fsfilt_ext3_get_xattr(inode,
 542                                            XATTR_LUSTRE_MDS_LOV_EA,
 543                                            lmm, lmm_size);
 544                 break;
 545         case EA_MEA:
 546                 rc = fsfilt_ext3_get_xattr(inode,
 547                                            XATTR_LUSTRE_MDS_MEA_EA,
 548                                            lmm, lmm_size);
 549                 break;
 550         case EA_SID:
 551                 rc = fsfilt_ext3_get_xattr(inode,
 552                                            XATTR_LUSTRE_MDS_SID_EA,
 553                                            lmm, lmm_size);
 554                 break;
 555         case EA_MID:
 556                 rc = fsfilt_ext3_get_xattr(inode,
 557                                            XATTR_LUSTRE_MDS_MID_EA,
 558                                            lmm, lmm_size);
 559                 break;
 560         case EA_PID:
 561                 rc = fsfilt_ext3_get_xattr(inode,
 562                                            XATTR_LUSTRE_MDS_PID_EA,
 563                                            lmm, lmm_size);
 564                 break;
 565         case EA_KEY:
 566                 rc = fsfilt_ext3_get_xattr(inode,
 567                                            XATTR_LUSTRE_MDS_KEY_EA,
 568                                            lmm, lmm_size);
 569                 break;
 570         default:
 571                 return -EINVAL;
 572         }
 573
 574         return rc;
 575 }
 576
 577 static int fsfilt_ext3_send_bio(int rw, struct inode *inode, void *bio)
 578 {
 579         int rc = 0;
 580 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 581         submit_bio(rw, (struct bio *)bio);
 582 #else
 583         struct bio *b = (struct kiobuf *)bio;
 584         int blocks_per_page;
 585
 586         rc = brw_kiovec(rw, 1, &b, inode->i_dev,
 587                         b->blocks, 1 << inode->i_blkbits);
 588
 589         blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 590
 591         if (rc != (1 << inode->i_blkbits) * b->nr_pages * blocks_per_page) {
 592                 CERROR("short write?  expected %d, wrote %d\n",
 593                        (1 << inode->i_blkbits) * b->nr_pages *
 594                        blocks_per_page, rc);
 595         }
 596 #endif
 597         return rc;
 598 }
 599
 600 static struct page *fsfilt_ext3_getpage(struct inode *inode, long int index)
 601 {
 602         int rc;
 603         struct page *page;
 604
 605         page = grab_cache_page(inode->i_mapping, index);
 606         if (page == NULL)
 607                 return ERR_PTR(-ENOMEM);
 608
 609         if (PageUptodate(page)) {
 610                 unlock_page(page);
 611                 return page;
 612         }
 613
 614         rc = inode->i_mapping->a_ops->readpage(NULL, page);
 615         if (rc < 0) {
 616                 page_cache_release(page);
 617                 return ERR_PTR(rc);
 618         }
 619
 620         return page;
 621 }
 622
 623 static ssize_t fsfilt_ext3_readpage(struct file *file, char *buf, size_t count,
 624                                     loff_t *off)
 625 {
 626         struct inode *inode = file->f_dentry->d_inode;
 627         int rc = 0;
 628
 629         if (S_ISREG(inode->i_mode))
 630                 rc = file->f_op->read(file, buf, count, off);
 631         else {
 632                 const int blkbits = inode->i_sb->s_blocksize_bits;
 633                 const int blksize = inode->i_sb->s_blocksize;
 634
 635                 CDEBUG(D_EXT2, "reading "LPSZ" at dir %lu+%llu\n",
 636                        count, inode->i_ino, *off);
 637                 while (count > 0) {
 638                         struct buffer_head *bh;
 639
 640                         bh = NULL;
 641                         if (*off < inode->i_size) {
 642                                 int err = 0;
 643
 644                                 bh = ext3_bread(NULL, inode, *off >> blkbits,
 645                                                 0, &err);
 646
 647                                 CDEBUG(D_EXT2, "read %u@%llu\n", blksize, *off);
 648
 649                                 if (bh) {
 650                                         memcpy(buf, bh->b_data, blksize);
 651                                         brelse(bh);
 652                                 } else if (err) {
 653                                         /* XXX in theory we should just fake
 654                                          * this buffer and continue like ext3,
 655                                          * especially if this is a partial read
 656                                          */
 657                                         CERROR("error read dir %lu+%llu: %d\n",
 658                                                inode->i_ino, *off, err);
 659                                         RETURN(err);
 660                                 }
 661                         }
 662                         if (!bh) {
 663                                 struct ext3_dir_entry_2 *fake = (void *)buf;
 664
 665                                 CDEBUG(D_EXT2, "fake %u@%llu\n", blksize, *off);
 666                                 memset(fake, 0, sizeof(*fake));
 667                                 fake->rec_len = cpu_to_le32(blksize);
 668                         }
 669                         count -= blksize;
 670                         buf += blksize;
 671                         *off += blksize;
 672                         rc += blksize;
 673                 }
 674         }
 675
 676         return rc;
 677 }
 678
 679 static void fsfilt_ext3_cb_func(struct journal_callback *jcb, int error)
 680 {
 681         struct fsfilt_cb_data *fcb = (struct fsfilt_cb_data *)jcb;
 682
 683         fcb->cb_func(fcb->cb_obd, fcb->cb_last_num, fcb->cb_data, error);
 684
 685         OBD_SLAB_FREE(fcb, fcb_cache, sizeof *fcb);
 686         atomic_dec(&fcb_cache_count);
 687 }
 688
 689 static int fsfilt_ext3_add_journal_cb(struct obd_device *obd,
 690                                       struct super_block *sb,
 691                                       __u64 last_num, void *handle,
 692                                       fsfilt_cb_t cb_func,
 693                                       void *cb_data)
 694 {
 695         struct fsfilt_cb_data *fcb;
 696
 697         OBD_SLAB_ALLOC(fcb, fcb_cache, GFP_NOFS, sizeof *fcb);
 698         if (fcb == NULL)
 699                 RETURN(-ENOMEM);
 700
 701         atomic_inc(&fcb_cache_count);
 702         fcb->cb_func = cb_func;
 703         fcb->cb_obd = obd;
 704         fcb->cb_last_num = last_num;
 705         fcb->cb_data = cb_data;
 706
 707         CDEBUG(D_EXT2, "set callback for last_num: "LPD64"\n", last_num);
 708         lock_24kernel();
 709         journal_callback_set(handle, fsfilt_ext3_cb_func,
 710                              (struct journal_callback *)fcb);
 711         unlock_24kernel();
 712         return 0;
 713 }
 714
 715 /*
 716  * We need to hack the return value for the free inode counts because
 717  * the current EA code requires one filesystem block per inode with EAs,
 718  * so it is possible to run out of blocks before we run out of inodes.
 719  *
 720  * This can be removed when the ext3 EA code is fixed.
 721  */
 722 static int fsfilt_ext3_statfs(struct super_block *sb, struct obd_statfs *osfs)
 723 {
 724         struct kstatfs sfs;
 725         int rc;
 726
 727         memset(&sfs, 0, sizeof(sfs));
 728
 729         rc = sb->s_op->statfs(sb, &sfs);
 730
 731         if (!rc && sfs.f_bfree < sfs.f_ffree) {
 732                 sfs.f_files = (sfs.f_files - sfs.f_ffree) + sfs.f_bfree;
 733                 sfs.f_ffree = sfs.f_bfree;
 734         }
 735
 736         statfs_pack(osfs, &sfs);
 737         return rc;
 738 }
 739
 740 static int fsfilt_ext3_sync(struct super_block *sb)
 741 {
 742         return ext3_force_commit(sb);
 743 }
 744
 745 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
 746 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 747 #define ext3_up_truncate_sem(inode)  up_write(&EXT3_I(inode)->truncate_sem);
 748 #define ext3_down_truncate_sem(inode)  down_write(&EXT3_I(inode)->truncate_sem);
 749 #else
 750 #define ext3_up_truncate_sem(inode)  up(&EXT3_I(inode)->truncate_sem);
 751 #define ext3_down_truncate_sem(inode)  down(&EXT3_I(inode)->truncate_sem);
 752 #endif
 753
 754 #include <linux/lustre_version.h>
 755 #if EXT3_EXT_MAGIC == 0xf301
 756 #define ee_start e_start
 757 #define ee_block e_block
 758 #define ee_len   e_num
 759 #endif
 760 #ifndef EXT3_BB_MAX_BLOCKS
 761 #define ext3_mb_new_blocks(handle, inode, goal, count, aflags, err) \
 762         ext3_new_blocks(handle, inode, count, goal, err)
 763 #endif
 764
 765 struct bpointers {
 766         unsigned long *blocks;
 767         int *created;
 768         unsigned long start;
 769         int num;
 770         int init_num;
 771         int create;
 772 };
 773 static int ext3_ext_find_goal(struct inode *inode, struct ext3_ext_path *path,
 774                                 unsigned long block, int *aflags)
 775 {
 776         struct ext3_inode_info *ei = EXT3_I(inode);
 777         unsigned long bg_start;
 778         unsigned long colour;
 779         int depth;
 780
 781         if (path) {
 782                 struct ext3_extent *ex;
 783                 depth = path->p_depth;
 784
 785                 /* try to predict block placement */
 786                 if ((ex = path[depth].p_ext)) {
 787 #if 0
 788                         /* This prefers to eat into a contiguous extent
 789                          * rather than find an extent that the whole
 790                          * request will fit into.  This can fragment data
 791                          * block allocation and prevents our lovely 1M I/Os
 792                          * from reaching the disk intact. */
 793
 794                         if (ex->ee_block + ex->ee_len == block)
 795                                 *aflags |= 1;
 796 #endif
 797                         return ex->ee_start + (block - ex->ee_block);
 798                 }
 799
 800                 /* it looks index is empty
 801                  * try to find starting from index itself */
 802                 if (path[depth].p_bh)
 803                         return path[depth].p_bh->b_blocknr;
 804         }
 805
 806         /* OK. use inode's group */
 807         bg_start = (ei->i_block_group * EXT3_BLOCKS_PER_GROUP(inode->i_sb)) +
 808                 le32_to_cpu(EXT3_SB(inode->i_sb)->s_es->s_first_data_block);
 809         colour = (current->pid % 16) *
 810                         (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16);
 811         return bg_start + colour + block;
 812 }
 813
 814 static int ext3_ext_new_extent_cb(struct ext3_extents_tree *tree,
 815                                   struct ext3_ext_path *path,
 816                                   struct ext3_extent *newex, int exist)
 817 {
 818         struct inode *inode = tree->inode;
 819         struct bpointers *bp = tree->private;
 820         int count, err, goal;
 821         unsigned long pblock;
 822         unsigned long tgen;
 823         loff_t new_i_size;
 824         handle_t *handle;
 825         int i, aflags = 0;
 826
 827         i = EXT_DEPTH(tree);
 828         EXT_ASSERT(i == path->p_depth);
 829         EXT_ASSERT(path[i].p_hdr);
 830
 831         if (exist) {
 832                 err = EXT_CONTINUE;
 833                 goto map;
 834         }
 835
 836         if (bp->create == 0) {
 837                 i = 0;
 838                 if (newex->ee_block < bp->start)
 839                         i = bp->start - newex->ee_block;
 840                 if (i >= newex->ee_len)
 841                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 842                                         i, newex->ee_len);
 843                 for (; i < newex->ee_len && bp->num; i++) {
 844                         *(bp->created) = 0;
 845                         bp->created++;
 846                         *(bp->blocks) = 0;
 847                         bp->blocks++;
 848                         bp->num--;
 849                         bp->start++;
 850                 }
 851
 852                 return EXT_CONTINUE;
 853         }
 854         tgen = EXT_GENERATION(tree);
 855         count = ext3_ext_calc_credits_for_insert(tree, path);
 856         ext3_up_truncate_sem(inode);
 857         lock_24kernel();
 858         handle = journal_start(EXT3_JOURNAL(inode), count + EXT3_ALLOC_NEEDED + 1);
 859         unlock_24kernel();
 860         if (IS_ERR(handle)) {
 861                 ext3_down_truncate_sem(inode);
 862                 return PTR_ERR(handle);
 863         }
 864
 865         if (tgen != EXT_GENERATION(tree)) {
 866                 /* the tree has changed. so path can be invalid at moment */
 867                 lock_24kernel();
 868                 journal_stop(handle);
 869                 unlock_24kernel();
 870                 ext3_down_truncate_sem(inode);
 871                 return EXT_REPEAT;
 872         }
 873         ext3_down_truncate_sem(inode);
 874         count = newex->ee_len;
 875         goal = ext3_ext_find_goal(inode, path, newex->ee_block, &aflags);
 876         aflags |= 2; /* block have been already reserved */
 877         pblock = ext3_mb_new_blocks(handle, inode, goal, &count, aflags, &err);
 878         if (!pblock)
 879                 goto out;
 880         EXT_ASSERT(count <= newex->ee_len);
 881
 882         /* insert new extent */
 883         newex->ee_start = pblock;
 884         newex->ee_len = count;
 885         err = ext3_ext_insert_extent(handle, tree, path, newex);
 886         if (err)
 887                 goto out;
 888
 889         /* correct on-disk inode size */
 890         if (newex->ee_len > 0) {
 891                 new_i_size = (loff_t) newex->ee_block + newex->ee_len;
 892                 new_i_size = new_i_size << inode->i_blkbits;
 893                 if (new_i_size > EXT3_I(inode)->i_disksize) {
 894                         EXT3_I(inode)->i_disksize = new_i_size;
 895                         err = ext3_mark_inode_dirty(handle, inode);
 896                 }
 897         }
 898 out:
 899         lock_24kernel();
 900         journal_stop(handle);
 901         unlock_24kernel();
 902 map:
 903         if (err >= 0) {
 904                 /* map blocks */
 905                 if (bp->num == 0) {
 906                         CERROR("hmm. why do we find this extent?\n");
 907                         CERROR("initial space: %lu:%u\n",
 908                                 bp->start, bp->init_num);
 909                         CERROR("current extent: %u/%u/%u %d\n",
 910                                 newex->ee_block, newex->ee_len,
 911                                 newex->ee_start, exist);
 912                 }
 913                 i = 0;
 914                 if (newex->ee_block < bp->start)
 915                         i = bp->start - newex->ee_block;
 916                 if (i >= newex->ee_len)
 917                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 918                                         i, newex->ee_len);
 919                 for (; i < newex->ee_len && bp->num; i++) {
 920                         *(bp->created) = (exist == 0 ? 1 : 0);
 921                         bp->created++;
 922                         *(bp->blocks) = newex->ee_start + i;
 923                         bp->blocks++;
 924                         bp->num--;
 925                         bp->start++;
 926                 }
 927         }
 928         return err;
 929 }
 930
 931 int fsfilt_map_nblocks(struct inode *inode, unsigned long block,
 932                        unsigned long num, unsigned long *blocks,
 933                        int *created, int create)
 934 {
 935         struct ext3_extents_tree tree;
 936         struct bpointers bp;
 937         int err, i;
 938
 939         CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
 940                 block, block + num, (unsigned) inode->i_ino);
 941
 942         ext3_init_tree_desc(&tree, inode);
 943         tree.private = &bp;
 944         bp.blocks = blocks;
 945         bp.created = created;
 946         bp.start = block;
 947         bp.init_num = bp.num = num;
 948         bp.create = create;
 949
 950         ext3_down_truncate_sem(inode);
 951         err = ext3_ext_walk_space(&tree, block, num, ext3_ext_new_extent_cb);
 952         ext3_ext_invalidate_cache(&tree);
 953         ext3_up_truncate_sem(inode);
 954
 955         /* unmap underlying pages/buffers from blockdevice mapping */
 956         if (create) {
 957                 struct block_device *bdev = inode->i_sb->s_bdev;
 958                 for (i = 0; i < num; i++) {
 959                         if (created[i] == 0)
 960                                 continue;
 961                         unmap_underlying_metadata(bdev, blocks[i]);
 962                 }
 963         }
 964         return err;
 965 }
 966
 967 int fsfilt_ext3_map_ext_inode_pages(struct inode *inode, struct page **page,
 968                                     int pages, unsigned long *blocks,
 969                                     int *created, int create)
 970 {
 971         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 972         int rc = 0, i = 0;
 973         struct page *fp = NULL;
 974         int clen = 0;
 975
 976         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
 977                 inode->i_ino, pages, (*page)->index);
 978
 979         /* pages are sorted already. so, we just have to find
 980          * contig. space and process them properly */
 981         while (i < pages) {
 982                 if (fp == NULL) {
 983                         /* start new extent */
 984                         fp = *page++;
 985                         clen = 1;
 986                         i++;
 987                         continue;
 988                 } else if (fp->index + clen == (*page)->index) {
 989                         /* continue the extent */
 990                         page++;
 991                         clen++;
 992                         i++;
 993                         continue;
 994                 }
 995
 996                 /* process found extent */
 997                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
 998                                         clen * blocks_per_page, blocks,
 999                                         created, create);
1000                 if (rc)
1001                         GOTO(cleanup, rc);
1002
1003                 /* look for next extent */
1004                 fp = NULL;
1005                 blocks += blocks_per_page * clen;
1006                 created += blocks_per_page * clen;
1007         }
1008
1009         if (fp)
1010                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
1011                                         clen * blocks_per_page, blocks,
1012                                         created, create);
1013 cleanup:
1014         return rc;
1015 }
1016 #endif
1017
1018 extern int ext3_map_inode_page(struct inode *inode, struct page *page,
1019                                unsigned long *blocks, int *created, int create);
1020 int fsfilt_ext3_map_bm_inode_pages(struct inode *inode, struct page **page,
1021                                    int pages, unsigned long *blocks,
1022                                    int *created, int create)
1023 {
1024         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
1025         unsigned long *b;
1026         int rc = 0, i, *cr;
1027
1028         for (i = 0, cr = created, b = blocks; i < pages; i++, page++) {
1029                 rc = ext3_map_inode_page(inode, *page, b, cr, create);
1030                 if (rc) {
1031                         CERROR("ino %lu, blk %lu cr %u create %d: rc %d\n",
1032                                inode->i_ino, *b, *cr, create, rc);
1033                         break;
1034                 }
1035
1036                 b += blocks_per_page;
1037                 cr += blocks_per_page;
1038         }
1039         return rc;
1040 }
1041
1042 int fsfilt_ext3_map_inode_pages(struct inode *inode, struct page **page,
1043                                 int pages, unsigned long *blocks,
1044                                 int *created, int create,
1045                                 struct semaphore *optional_sem)
1046 {
1047         int rc;
1048 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
1049         if (EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL) {
1050                 rc = fsfilt_ext3_map_ext_inode_pages(inode, page, pages,
1051                                                      blocks, created, create);
1052                 return rc;
1053         }
1054 #endif
1055         if (optional_sem != NULL)
1056                 down(optional_sem);
1057         rc = fsfilt_ext3_map_bm_inode_pages(inode, page, pages, blocks,
1058                                             created, create);
1059         if (optional_sem != NULL)
1060                 up(optional_sem);
1061
1062         return rc;
1063 }
1064
1065 extern int ext3_prep_san_write(struct inode *inode, long *blocks,
1066                                int nblocks, loff_t newsize);
1067 static int fsfilt_ext3_prep_san_write(struct inode *inode, long *blocks,
1068                                       int nblocks, loff_t newsize)
1069 {
1070         return ext3_prep_san_write(inode, blocks, nblocks, newsize);
1071 }
1072
1073 static int fsfilt_ext3_read_record(struct file * file, void *buf,
1074                                    int size, loff_t *offs)
1075 {
1076         struct inode *inode = file->f_dentry->d_inode;
1077         unsigned long block;
1078         struct buffer_head *bh;
1079         int err, blocksize, csize, boffs;
1080
1081         /* prevent reading after eof */
1082         lock_kernel();
1083         if (inode->i_size < *offs + size) {
1084                 size = inode->i_size - *offs;
1085                 unlock_kernel();
1086                 if (size < 0) {
1087                         CERROR("size %llu is too short for read %u@%llu\n",
1088                                inode->i_size, size, *offs);
1089                         return -EIO;
1090                 } else if (size == 0) {
1091                         return 0;
1092                 }
1093         } else {
1094                 unlock_kernel();
1095         }
1096
1097         blocksize = 1 << inode->i_blkbits;
1098
1099         while (size > 0) {
1100                 block = *offs >> inode->i_blkbits;
1101                 boffs = *offs & (blocksize - 1);
1102                 csize = min(blocksize - boffs, size);
1103                 bh = ext3_bread(NULL, inode, block, 0, &err);
1104                 if (!bh) {
1105                         CERROR("can't read block: %d\n", err);
1106                         return err;
1107                 }
1108
1109                 memcpy(buf, bh->b_data + boffs, csize);
1110                 brelse(bh);
1111
1112                 *offs += csize;
1113                 buf += csize;
1114                 size -= csize;
1115         }
1116         return 0;
1117 }
1118
1119 static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
1120                                     loff_t *offs, int force_sync)
1121 {
1122         struct buffer_head *bh = NULL;
1123         unsigned long block;
1124         struct inode *inode = file->f_dentry->d_inode;
1125         loff_t old_size = inode->i_size, offset = *offs;
1126         loff_t new_size = inode->i_size;
1127         journal_t *journal;
1128         handle_t *handle;
1129         int err = 0, block_count = 0, blocksize, size, boffs;
1130
1131         /* Determine how many transaction credits are needed */
1132         blocksize = 1 << inode->i_blkbits;
1133         block_count = (*offs & (blocksize - 1)) + bufsize;
1134         block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
1135
1136         journal = EXT3_SB(inode->i_sb)->s_journal;
1137         lock_24kernel();
1138         handle = journal_start(journal,
1139                                block_count * EXT3_DATA_TRANS_BLOCKS + 2);
1140         unlock_24kernel();
1141         if (IS_ERR(handle)) {
1142                 CERROR("can't start transaction\n");
1143                 return PTR_ERR(handle);
1144         }
1145
1146         while (bufsize > 0) {
1147                 if (bh != NULL)
1148                         brelse(bh);
1149
1150                 block = offset >> inode->i_blkbits;
1151                 boffs = offset & (blocksize - 1);
1152                 size = min(blocksize - boffs, bufsize);
1153                 bh = ext3_bread(handle, inode, block, 1, &err);
1154                 if (!bh) {
1155                         CERROR("can't read/create block: %d\n", err);
1156                         goto out;
1157                 }
1158
1159                 err = ext3_journal_get_write_access(handle, bh);
1160                 if (err) {
1161                         CERROR("journal_get_write_access() returned error %d\n",
1162                                err);
1163                         goto out;
1164                 }
1165                 LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
1166                 memcpy(bh->b_data + boffs, buf, size);
1167                 err = ext3_journal_dirty_metadata(handle, bh);
1168                 if (err) {
1169                         CERROR("journal_dirty_metadata() returned error %d\n",
1170                                err);
1171                         goto out;
1172                 }
1173                 if (offset + size > new_size)
1174                         new_size = offset + size;
1175                 offset += size;
1176                 bufsize -= size;
1177                 buf += size;
1178         }
1179
1180         if (force_sync)
1181                 handle->h_sync = 1; /* recovery likes this */
1182 out:
1183         if (bh)
1184                 brelse(bh);
1185
1186         /* correct in-core and on-disk sizes */
1187         if (new_size > inode->i_size) {
1188                 lock_kernel();
1189                 if (new_size > inode->i_size)
1190                         inode->i_size = new_size;
1191                 if (inode->i_size > EXT3_I(inode)->i_disksize)
1192                         EXT3_I(inode)->i_disksize = inode->i_size;
1193                 if (inode->i_size > old_size)
1194                         mark_inode_dirty(inode);
1195                 unlock_kernel();
1196         }
1197
1198         lock_24kernel();
1199         journal_stop(handle);
1200         unlock_24kernel();
1201
1202         if (err == 0)
1203                 *offs = offset;
1204         return err;
1205 }
1206
1207 static int fsfilt_ext3_setup(struct obd_device *obd, struct super_block *sb)
1208 {
1209 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1210         struct mds_obd *mds = &obd->u.mds;
1211 #endif
1212 #if 0
1213         EXT3_SB(sb)->dx_lock = fsfilt_ext3_dx_lock;
1214         EXT3_SB(sb)->dx_unlock = fsfilt_ext3_dx_unlock;
1215 #endif
1216 #ifdef S_PDIROPS
1217         CWARN("Enabling PDIROPS\n");
1218         set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
1219         sb->s_flags |= S_PDIROPS;
1220 #endif
1221         /* setup mdsnum in underlying fs */
1222 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1223         if (mds->mds_md_obd) {
1224                 struct ext3_sb_info *sbi = EXT3_SB(sb);
1225                 struct ext3_super_block *es = sbi->s_es;
1226                 handle_t *handle;
1227                 int err;
1228
1229                 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_MDSNUM)) {
1230                         CWARN("%s: set mdsnum %d in ext3\n",
1231                               obd->obd_name, mds->mds_num);
1232                         lock_24kernel();
1233                         handle = journal_start(sbi->s_journal, 1);
1234                         unlock_24kernel();
1235                         LASSERT(!IS_ERR(handle));
1236                         err = ext3_journal_get_write_access(handle, sbi->s_sbh);
1237                         LASSERT(err == 0);
1238                         EXT3_SET_INCOMPAT_FEATURE(sb,
1239                                                 EXT3_FEATURE_INCOMPAT_MDSNUM);
1240                         es->s_mdsnum = mds->mds_num;
1241                         err = ext3_journal_dirty_metadata(handle, sbi->s_sbh);
1242                         LASSERT(err == 0);
1243                         lock_24kernel();
1244                         journal_stop(handle);
1245                         unlock_24kernel();
1246                 } else {
1247                         CWARN("%s: mdsnum initialized to %u in ext3fs\n",
1248                                 obd->obd_name, es->s_mdsnum);
1249                 }
1250                 sbi->s_mdsnum = es->s_mdsnum;
1251         }
1252 #endif
1253         return 0;
1254 }
1255
1256 extern int ext3_add_dir_entry(struct dentry *dentry);
1257 extern int ext3_del_dir_entry(struct dentry *dentry);
1258
1259 static int fsfilt_ext3_add_dir_entry(struct obd_device *obd,
1260                                      struct dentry *parent,
1261                                      char *name, int namelen,
1262                                      unsigned long ino,
1263                                      unsigned long generation,
1264                                      unsigned long mds,
1265                                      unsigned long fid)
1266 {
1267 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1268         struct dentry *dentry;
1269         int err;
1270         LASSERT(ino != 0);
1271         LASSERT(namelen != 0);
1272         dentry = ll_lookup_one_len(name, parent, namelen);
1273         if (IS_ERR(dentry)) {
1274                 CERROR("can't lookup %*s in %lu/%lu: %d\n", dentry->d_name.len,
1275                        dentry->d_name.name, dentry->d_inode->i_ino,
1276                        (unsigned long) dentry->d_inode->i_generation,
1277                        (int) PTR_ERR(dentry));
1278                 RETURN(PTR_ERR(dentry));
1279         }
1280         if (dentry->d_inode != NULL || dentry->d_flags & DCACHE_CROSS_REF) {
1281                 CERROR("dentry %*s(0x%p) found\n", dentry->d_name.len,
1282                        dentry->d_name.name, dentry);
1283                 l_dput(dentry);
1284                 RETURN(-EEXIST);
1285         }
1286
1287         /* mds_reint_rename() may use this method to add dir entry
1288          * that points onto local inode. and we don't want to find
1289          * it cross-ref by subsequent lookups */
1290         d_drop(dentry);
1291
1292         dentry->d_flags |= DCACHE_CROSS_REF;
1293         dentry->d_inum = ino;
1294         dentry->d_mdsnum = mds;
1295         dentry->d_generation = generation;
1296         dentry->d_fid = fid;
1297         lock_24kernel();
1298         err = ext3_add_dir_entry(dentry);
1299         unlock_24kernel();
1300
1301         l_dput(dentry);
1302
1303         RETURN(err);
1304 #else
1305 #error "rebuild kernel and lustre with ext3-mds-num patch!"
1306         LASSERT(0);
1307 #endif
1308 }
1309
1310 static int fsfilt_ext3_del_dir_entry(struct obd_device *obd,
1311                                  struct dentry *dentry)
1312 {
1313 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1314         int err;
1315         lock_24kernel();
1316         err = ext3_del_dir_entry(dentry);
1317         unlock_24kernel();
1318         if (err == 0)
1319                 d_drop(dentry);
1320         return err;
1321 #else
1322 #error "rebuild kernel and lustre with ext3-mds-num patch!"
1323         LASSERT(0);
1324 #endif
1325 }
1326
1327 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
1328    objects. Logs is number of logfiles to update */
1329 static int fsfilt_ext3_get_op_len(int op, struct fsfilt_objinfo *fso, int logs)
1330 {
1331         if ( !fso ) {
1332                 switch(op) {
1333                 case FSFILT_OP_CREATE:
1334                                  /* directory leaf, index & indirect & EA*/
1335                         return 4 + 3 * logs;
1336                 case FSFILT_OP_UNLINK:
1337                         return 3 * logs;
1338                 }
1339         } else {
1340                 int i;
1341                 int needed = 0;
1342                 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
1343                 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
1344                 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
1345                 for (i = 0; i < op; i++, fso++) {
1346                         int nblocks = fso->fso_bufcnt * blockpp;
1347                         int ndindirect = min(nblocks, addrpp + 1);
1348                         int nindir = nblocks + ndindirect + 1;
1349
1350                         needed += nindir;
1351                 }
1352                 return needed + 3 * logs;
1353         }
1354
1355         return 0;
1356 }
1357
1358
1359 #define EXTENTS_EA "write_extents"
1360 #define EXTENTS_EA_SIZE 64
1361
1362 int ext3_ext_in_ea_alloc_space(struct inode *, int, const char *, unsigned long, unsigned long);
1363 int ext3_ext_in_ea_remove_space(struct inode *, int, const char *, unsigned long, unsigned long);
1364 int ext3_ext_in_ea_get_extents(struct inode *, int, const char *, char **, int *);
1365 int ext3_ext_in_ea_get_extents_num(struct inode *, int, const char *, int *);
1366
1367 static int fsfilt_ext3_insert_extents_ea(struct inode *inode,
1368                                       unsigned long from,
1369                                       unsigned long num)
1370 {
1371         int rc = 0;
1372
1373         rc = ext3_ext_in_ea_alloc_space(inode, EXT3_XATTR_INDEX_TRUSTED,
1374                                         EXTENTS_EA, from, num);
1375         return rc;
1376 }
1377
1378 static int fsfilt_ext3_remove_extents_ea(struct inode *inode,
1379                                          unsigned long from,
1380                                          unsigned long num)
1381 {
1382         int rc = 0;
1383
1384         rc = ext3_ext_in_ea_remove_space(inode, EXT3_XATTR_INDEX_TRUSTED,
1385                                          EXTENTS_EA, from, num);
1386         return rc;
1387 }
1388
1389 extern int ext3_init_tree_in_ea(struct inode *inode, int name_index,
1390                                 const char *eaname, int size);
1391
1392 static int fsfilt_ext3_init_extents_ea(struct inode *inode)
1393 {
1394         int rc = 0;
1395
1396         rc = ext3_init_tree_in_ea(inode, EXT3_XATTR_INDEX_TRUSTED,
1397                                   EXTENTS_EA, 64);
1398         return rc;
1399 }
1400
1401 static int fsfilt_ext3_get_inode_write_extents(struct inode *inode,
1402                                          char **pbuf, int *size)
1403 {
1404         int rc = 0;
1405
1406         rc = ext3_ext_in_ea_get_extents(inode, EXT3_XATTR_INDEX_TRUSTED,
1407                                         EXTENTS_EA,  pbuf, size);
1408         return rc;
1409 }
1410
1411 static int fsfilt_ext3_get_write_extents_num(struct inode *inode, int *size)
1412 {
1413         int rc = 0;
1414
1415         rc = ext3_ext_in_ea_get_extents_num(inode, EXT3_XATTR_INDEX_TRUSTED,
1416                                             EXTENTS_EA, size);
1417         return rc;
1418 }
1419
1420 static struct fsfilt_operations fsfilt_ext3_ops = {
1421         .fs_type                    = "ext3",
1422         .fs_owner                   = THIS_MODULE,
1423         .fs_start                   = fsfilt_ext3_start,
1424         .fs_brw_start               = fsfilt_ext3_brw_start,
1425         .fs_commit                  = fsfilt_ext3_commit,
1426         .fs_commit_async            = fsfilt_ext3_commit_async,
1427         .fs_commit_wait             = fsfilt_ext3_commit_wait,
1428         .fs_setattr                 = fsfilt_ext3_setattr,
1429         .fs_iocontrol               = fsfilt_ext3_iocontrol,
1430         .fs_set_md                  = fsfilt_ext3_set_md,
1431         .fs_get_md                  = fsfilt_ext3_get_md,
1432         .fs_readpage                = fsfilt_ext3_readpage,
1433         .fs_add_journal_cb          = fsfilt_ext3_add_journal_cb,
1434         .fs_statfs                  = fsfilt_ext3_statfs,
1435         .fs_sync                    = fsfilt_ext3_sync,
1436         .fs_map_inode_pages         = fsfilt_ext3_map_inode_pages,
1437         .fs_prep_san_write          = fsfilt_ext3_prep_san_write,
1438         .fs_write_record            = fsfilt_ext3_write_record,
1439         .fs_read_record             = fsfilt_ext3_read_record,
1440         .fs_setup                   = fsfilt_ext3_setup,
1441         .fs_getpage                 = fsfilt_ext3_getpage,
1442         .fs_send_bio                = fsfilt_ext3_send_bio,
1443         .fs_set_xattr               = fsfilt_ext3_set_xattr,
1444         .fs_get_xattr               = fsfilt_ext3_get_xattr,
1445         .fs_get_op_len              = fsfilt_ext3_get_op_len,
1446         .fs_add_dir_entry           = fsfilt_ext3_add_dir_entry,
1447         .fs_del_dir_entry           = fsfilt_ext3_del_dir_entry,
1448         .fs_init_extents_ea         = fsfilt_ext3_init_extents_ea,
1449         .fs_insert_extents_ea       = fsfilt_ext3_insert_extents_ea,
1450         .fs_remove_extents_ea       = fsfilt_ext3_remove_extents_ea,
1451         .fs_get_inode_write_extents = fsfilt_ext3_get_inode_write_extents,
1452         .fs_get_write_extents_num   = fsfilt_ext3_get_write_extents_num,
1453 };
1454
1455 static int __init fsfilt_ext3_init(void)
1456 {
1457         int rc;
1458
1459         fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
1460                                       sizeof(struct fsfilt_cb_data), 0,
1461                                       0, NULL, NULL);
1462         if (!fcb_cache) {
1463                 CERROR("error allocating fsfilt journal callback cache\n");
1464                 GOTO(out, rc = -ENOMEM);
1465         }
1466
1467         rc = fsfilt_register_ops(&fsfilt_ext3_ops);
1468
1469         if (rc)
1470                 kmem_cache_destroy(fcb_cache);
1471 out:
1472         return rc;
1473 }
1474
1475 static void __exit fsfilt_ext3_exit(void)
1476 {
1477         fsfilt_unregister_ops(&fsfilt_ext3_ops);
1478         LASSERTF(kmem_cache_destroy(fcb_cache) == 0,
1479                  "can't free fsfilt callback cache: count %d\n",
1480                  atomic_read(&fcb_cache_count));
1481 }
1482
1483 module_init(fsfilt_ext3_init);
1484 module_exit(fsfilt_ext3_exit);
1485
1486 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1487 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
1488 MODULE_LICENSE("GPL");