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 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  39 #include <linux/ext3_xattr.h>
  40 #else
  41 #include <ext3/xattr.h>
  42 #endif
  43
  44 #include <linux/kp30.h>
  45 #include <linux/lustre_fsfilt.h>
  46 #include <linux/obd.h>
  47 #include <linux/obd_class.h>
  48 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  49 #include <linux/iobuf.h>
  50 #endif
  51
  52 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
  53 #include <linux/ext3_extents.h>
  54 #endif
  55
  56 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,7))
  57 # define lock_24kernel() lock_kernel()
  58 # define unlock_24kernel() unlock_kernel()
  59 #else
  60 # define lock_24kernel() do {} while (0)
  61 # define unlock_24kernel() do {} while (0)
  62 #endif
  63
  64 static kmem_cache_t *fcb_cache;
  65 static atomic_t fcb_cache_count = ATOMIC_INIT(0);
  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 #define EXT3_XATTR_INDEX_LUSTRE         5                         /* old */
  81 #define XATTR_LUSTRE_MDS_OBJID          "system.lustre_mds_objid" /* old */
  82
  83 /*
  84  * We don't currently need any additional blocks for rmdir and
  85  * unlink transactions because we are storing the OST oa_id inside
  86  * the inode (which we will be changing anyways as part of this
  87  * transaction).
  88  */
  89 static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
  90                                int logs)
  91 {
  92         /* For updates to the last recieved file */
  93         int nblocks = EXT3_SINGLEDATA_TRANS_BLOCKS;
  94         journal_t *journal;
  95         void *handle;
  96
  97         if (current->journal_info) {
  98                 CDEBUG(D_INODE, "increasing refcount on %p\n",
  99                        current->journal_info);
 100                 goto journal_start;
 101         }
 102
 103         switch(op) {
 104         case FSFILT_OP_RMDIR:
 105         case FSFILT_OP_UNLINK:
 106                 /* delete one file + create/update logs for each stripe */
 107                 nblocks += EXT3_DELETE_TRANS_BLOCKS;
 108                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 109                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 110                 break;
 111         case FSFILT_OP_RENAME:
 112                 /* modify additional directory */
 113                 nblocks += EXT3_SINGLEDATA_TRANS_BLOCKS;
 114                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 115                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 116                 /* no break */
 117         case FSFILT_OP_SYMLINK:
 118                 /* additional block + block bitmap + GDT for long symlink */
 119                 nblocks += 3;
 120                 /* no break */
 121         case FSFILT_OP_CREATE:
 122                 /* create/update logs for each stripe */
 123                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 124                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 125                 /* no break */
 126         case FSFILT_OP_MKDIR:
 127         case FSFILT_OP_MKNOD:
 128                 /* modify one inode + block bitmap + GDT */
 129                 nblocks += 3;
 130                 /* no break */
 131         case FSFILT_OP_LINK:
 132                 /* modify parent directory */
 133                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 134                         EXT3_DATA_TRANS_BLOCKS;
 135                 break;
 136         case FSFILT_OP_SETATTR:
 137                 /* Setattr on inode */
 138                 nblocks += 1;
 139                 break;
 140         case FSFILT_OP_CANCEL_UNLINK:
 141                 /* blocks for log header bitmap update OR
 142                  * blocks for catalog header bitmap update + unlink of logs */
 143                 nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
 144                         EXT3_DELETE_TRANS_BLOCKS * logs;
 145                 break;
 146         default: CERROR("unknown transaction start op %d\n", op);
 147                  LBUG();
 148         }
 149
 150         LASSERT(current->journal_info == desc_private);
 151         journal = EXT3_SB(inode->i_sb)->s_journal;
 152         if (nblocks > journal->j_max_transaction_buffers) {
 153                 CERROR("too many credits %d for op %ux%u using %d instead\n",
 154                        nblocks, op, logs, journal->j_max_transaction_buffers);
 155                 nblocks = journal->j_max_transaction_buffers;
 156         }
 157
 158  journal_start:
 159         LASSERTF(nblocks > 0, "can't start %d credit transaction\n", nblocks);
 160         lock_24kernel();
 161         handle = journal_start(EXT3_JOURNAL(inode), nblocks);
 162         unlock_24kernel();
 163
 164         if (!IS_ERR(handle))
 165                 LASSERT(current->journal_info == handle);
 166         else
 167                 CERROR("error starting handle for op %u (%u credits): rc %ld\n",
 168                        op, nblocks, PTR_ERR(handle));
 169         return handle;
 170 }
 171
 172 /*
 173  * Calculate the number of buffer credits needed to write multiple pages in
 174  * a single ext3 transaction.  No, this shouldn't be here, but as yet ext3
 175  * doesn't have a nice API for calculating this sort of thing in advance.
 176  *
 177  * See comment above ext3_writepage_trans_blocks for details.  We assume
 178  * no data journaling is being done, but it does allow for all of the pages
 179  * being non-contiguous.  If we are guaranteed contiguous pages we could
 180  * reduce the number of (d)indirect blocks a lot.
 181  *
 182  * With N blocks per page and P pages, for each inode we have at most:
 183  * N*P indirect
 184  * min(N*P, blocksize/4 + 1) dindirect blocks
 185  * niocount tindirect
 186  *
 187  * For the entire filesystem, we have at most:
 188  * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
 189  * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
 190  * objcount inode blocks
 191  * 1 superblock
 192  * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
 193  *
 194  * 1 EXT3_DATA_TRANS_BLOCKS for the last_rcvd update.
 195  */
 196 static int fsfilt_ext3_credits_needed(int objcount, struct fsfilt_objinfo *fso,
 197                                       int niocount, struct niobuf_local *nb)
 198 {
 199         struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
 200         __u64 next_indir;
 201         const int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
 202         int nbitmaps = 0, ngdblocks;
 203         int needed = objcount + 1; /* inodes + superblock */
 204         int i, j;
 205
 206         for (i = 0, j = 0; i < objcount; i++, fso++) {
 207                 /* two or more dindirect blocks in case we cross boundary */
 208                 int ndind = (long)((nb[j + fso->fso_bufcnt - 1].offset -
 209                                     nb[j].offset) >>
 210                                    sb->s_blocksize_bits) /
 211                         (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb));
 212                 nbitmaps += min(fso->fso_bufcnt, ndind > 0 ? ndind : 2);
 213
 214                 /* leaf, indirect, tindirect blocks for first block */
 215                 nbitmaps += blockpp + 2;
 216
 217                 j += fso->fso_bufcnt;
 218         }
 219
 220         next_indir = nb[0].offset +
 221                 (EXT3_ADDR_PER_BLOCK(sb) << sb->s_blocksize_bits);
 222         for (i = 1; i < niocount; i++) {
 223                 if (nb[i].offset >= next_indir) {
 224                         nbitmaps++;     /* additional indirect */
 225                         next_indir = nb[i].offset +
 226                                 (EXT3_ADDR_PER_BLOCK(sb)<<sb->s_blocksize_bits);
 227                 } else if (nb[i].offset != nb[i - 1].offset + sb->s_blocksize) {
 228                         nbitmaps++;     /* additional indirect */
 229                 }
 230                 nbitmaps += blockpp;    /* each leaf in different group? */
 231         }
 232
 233         ngdblocks = nbitmaps;
 234         if (nbitmaps > EXT3_SB(sb)->s_groups_count)
 235                 nbitmaps = EXT3_SB(sb)->s_groups_count;
 236         if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
 237                 ngdblocks = EXT3_SB(sb)->s_gdb_count;
 238
 239         needed += nbitmaps + ngdblocks;
 240
 241         /* last_rcvd update */
 242         needed += EXT3_DATA_TRANS_BLOCKS;
 243
 244 #if defined(CONFIG_QUOTA) && !defined(__x86_64__) /* XXX */
 245         /* We assume that there will be 1 bit set in s_dquot.flags for each
 246          * quota file that is active.  This is at least true for now.
 247          */
 248         needed += hweight32(sb_any_quota_enabled(sb)) *
 249                 EXT3_SINGLEDATA_TRANS_BLOCKS;
 250 #endif
 251
 252         return needed;
 253 }
 254
 255 /* We have to start a huge journal transaction here to hold all of the
 256  * metadata for the pages being written here.  This is necessitated by
 257  * the fact that we do lots of prepare_write operations before we do
 258  * any of the matching commit_write operations, so even if we split
 259  * up to use "smaller" transactions none of them could complete until
 260  * all of them were opened.  By having a single journal transaction,
 261  * we eliminate duplicate reservations for common blocks like the
 262  * superblock and group descriptors or bitmaps.
 263  *
 264  * We will start the transaction here, but each prepare_write will
 265  * add a refcount to the transaction, and each commit_write will
 266  * remove a refcount.  The transaction will be closed when all of
 267  * the pages have been written.
 268  */
 269 static void *fsfilt_ext3_brw_start(int objcount, struct fsfilt_objinfo *fso,
 270                                    int niocount, struct niobuf_local *nb,
 271                                    void *desc_private, int logs)
 272 {
 273         journal_t *journal;
 274         handle_t *handle;
 275         int needed;
 276         ENTRY;
 277
 278         LASSERT(current->journal_info == desc_private);
 279         journal = EXT3_SB(fso->fso_dentry->d_inode->i_sb)->s_journal;
 280         needed = fsfilt_ext3_credits_needed(objcount, fso, niocount, nb);
 281
 282         /* The number of blocks we could _possibly_ dirty can very large.
 283          * We reduce our request if it is absurd (and we couldn't get that
 284          * many credits for a single handle anyways).
 285          *
 286          * At some point we have to limit the size of I/Os sent at one time,
 287          * increase the size of the journal, or we have to calculate the
 288          * actual journal requirements more carefully by checking all of
 289          * the blocks instead of being maximally pessimistic.  It remains to
 290          * be seen if this is a real problem or not.
 291          */
 292         if (needed > journal->j_max_transaction_buffers) {
 293                 CERROR("want too many journal credits (%d) using %d instead\n",
 294                        needed, journal->j_max_transaction_buffers);
 295                 needed = journal->j_max_transaction_buffers;
 296         }
 297
 298         LASSERTF(needed > 0, "can't start %d credit transaction\n", needed);
 299         lock_24kernel();
 300         handle = journal_start(journal, needed);
 301         unlock_24kernel();
 302         if (IS_ERR(handle)) {
 303                 CERROR("can't get handle for %d credits: rc = %ld\n", needed,
 304                        PTR_ERR(handle));
 305         } else {
 306                 LASSERT(handle->h_buffer_credits >= needed);
 307                 LASSERT(current->journal_info == handle);
 308         }
 309
 310         RETURN(handle);
 311 }
 312
 313 static int fsfilt_ext3_commit(struct inode *inode, void *h, int force_sync)
 314 {
 315         int rc;
 316         handle_t *handle = h;
 317
 318         LASSERT(current->journal_info == handle);
 319         if (force_sync)
 320                 handle->h_sync = 1; /* recovery likes this */
 321
 322         lock_24kernel();
 323         rc = journal_stop(handle);
 324         unlock_24kernel();
 325
 326         return rc;
 327 }
 328
 329 static int fsfilt_ext3_commit_async(struct inode *inode, void *h,
 330                                     void **wait_handle)
 331 {
 332         unsigned long tid;
 333         transaction_t *transaction;
 334 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 335         unsigned long rtid;
 336 #endif
 337         handle_t *handle = h;
 338         journal_t *journal;
 339         int rc;
 340
 341         LASSERT(current->journal_info == handle);
 342
 343         lock_kernel();
 344         transaction = handle->h_transaction;
 345         journal = transaction->t_journal;
 346         tid = transaction->t_tid;
 347         /* we don't want to be blocked */
 348         handle->h_sync = 0;
 349         rc = journal_stop(handle);
 350         if (rc) {
 351                 CERROR("error while stopping transaction: %d\n", rc);
 352                 unlock_kernel();
 353                 return rc;
 354         }
 355 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 356         rtid = log_start_commit(journal, transaction);
 357         if (rtid != tid)
 358                 CERROR("strange race: %lu != %lu\n",
 359                        (unsigned long) tid, (unsigned long) rtid);
 360 #else
 361         log_start_commit(journal, transaction->t_tid);
 362 #endif
 363         unlock_kernel();
 364
 365         *wait_handle = (void *) tid;
 366         CDEBUG(D_INODE, "commit async: %lu\n", (unsigned long) tid);
 367         return 0;
 368 }
 369
 370 static int fsfilt_ext3_commit_wait(struct inode *inode, void *h)
 371 {
 372         tid_t tid = (tid_t)(long)h;
 373
 374         CDEBUG(D_INODE, "commit wait: %lu\n", (unsigned long) tid);
 375         if (is_journal_aborted(EXT3_JOURNAL(inode)))
 376                 return -EIO;
 377
 378         log_wait_commit(EXT3_JOURNAL(inode), tid);
 379
 380         return 0;
 381 }
 382
 383 static int fsfilt_ext3_setattr(struct dentry *dentry, void *handle,
 384                                struct iattr *iattr, int do_trunc)
 385 {
 386         struct inode *inode = dentry->d_inode;
 387         int rc;
 388
 389         lock_kernel();
 390
 391         /* A _really_ horrible hack to avoid removing the data stored
 392          * in the block pointers; this is really the "small" stripe MD data.
 393          * We can avoid further hackery by virtue of the MDS file size being
 394          * zero all the time (which doesn't invoke block truncate at unlink
 395          * time), so we assert we never change the MDS file size from zero. */
 396         if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
 397                 /* ATTR_SIZE would invoke truncate: clear it */
 398                 iattr->ia_valid &= ~ATTR_SIZE;
 399                 EXT3_I(inode)->i_disksize = inode->i_size = iattr->ia_size;
 400
 401                 /* make sure _something_ gets set - so new inode
 402                  * goes to disk (probably won't work over XFS */
 403                 if (!(iattr->ia_valid & (ATTR_MODE | ATTR_MTIME | ATTR_CTIME))){
 404                         iattr->ia_valid |= ATTR_MODE;
 405                         iattr->ia_mode = inode->i_mode;
 406                 }
 407         }
 408
 409         /* Don't allow setattr to change file type */
 410         iattr->ia_mode = (inode->i_mode & S_IFMT)|(iattr->ia_mode & ~S_IFMT);
 411
 412         /* We set these flags on the client, but have already checked perms
 413          * so don't confuse inode_change_ok. */
 414         iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
 415
 416         if (inode->i_op->setattr) {
 417                 rc = inode->i_op->setattr(dentry, iattr);
 418         } else {
 419                 rc = inode_change_ok(inode, iattr);
 420                 if (!rc)
 421                         rc = inode_setattr(inode, iattr);
 422         }
 423
 424         unlock_kernel();
 425
 426         return rc;
 427 }
 428
 429 static int fsfilt_ext3_iocontrol(struct inode * inode, struct file *file,
 430                                  unsigned int cmd, unsigned long arg)
 431 {
 432         int rc = 0;
 433         ENTRY;
 434
 435         if (inode->i_fop->ioctl)
 436                 rc = inode->i_fop->ioctl(inode, file, cmd, arg);
 437         else
 438                 RETURN(-ENOTTY);
 439
 440         RETURN(rc);
 441 }
 442
 443 #undef INLINE_EA
 444 #undef OLD_EA
 445 static int fsfilt_ext3_set_md(struct inode *inode, void *handle,
 446                               void *lmm, int lmm_size)
 447 {
 448         int rc, old_ea = 0;
 449
 450         LASSERT(down_trylock(&inode->i_sem) != 0);
 451
 452 #ifdef INLINE_EA  /* can go away before 1.0 - just for testing bug 2097 now */
 453         /* Nasty hack city - store stripe MD data in the block pointers if
 454          * it will fit, because putting it in an EA currently kills the MDS
 455          * performance.  We'll fix this with "fast EAs" in the future.
 456          */
 457         if (inode->i_blocks == 0 && lmm_size <= sizeof(EXT3_I(inode)->i_data) -
 458                                             sizeof(EXT3_I(inode)->i_data[0])) {
 459                 unsigned old_size = EXT3_I(inode)->i_data[0];
 460                 if (old_size != 0) {
 461                         LASSERT(old_size < sizeof(EXT3_I(inode)->i_data));
 462                         CERROR("setting EA on %lu/%u again... interesting\n",
 463                                inode->i_ino, inode->i_generation);
 464                 }
 465
 466                 EXT3_I(inode)->i_data[0] = cpu_to_le32(lmm_size);
 467                 memcpy(&EXT3_I(inode)->i_data[1], lmm, lmm_size);
 468                 mark_inode_dirty(inode);
 469                 return 0;
 470         }
 471 #endif
 472 #ifdef OLD_EA
 473         /* keep this when we get rid of OLD_EA (too noisy during conversion) */
 474         if (EXT3_I(inode)->i_file_acl /* || large inode EA flag */) {
 475                 CWARN("setting EA on %lu/%u again... interesting\n",
 476                        inode->i_ino, inode->i_generation);
 477                 old_ea = 1;
 478         }
 479
 480         lock_kernel();
 481         /* this can go away before 1.0.  For bug 2097 testing only. */
 482         rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_LUSTRE,
 483                                    XATTR_LUSTRE_MDS_OBJID, lmm, lmm_size, 0);
 484 #else
 485         lock_kernel();
 486         rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
 487                                    XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size, 0);
 488
 489         /* This tries to delete the old-format LOV EA, but only as long as we
 490          * have successfully saved the new-format LOV EA (we can always try
 491          * the conversion again the next time the file is accessed).  It is
 492          * possible (although unlikely) that the new-format LOV EA couldn't be
 493          * saved because it ran out of space but we would need a file striped
 494          * over least 123 OSTs before the two EAs filled a 4kB block.
 495          *
 496          * This can be removed when all filesystems have converted to the
 497          * new EA format, but otherwise adds little if any overhead.  If we
 498          * wanted backward compatibility for existing files, we could keep
 499          * the old EA around for a while but we'd have to clean it up later. */
 500         if (rc >= 0 && old_ea) {
 501                 int err = ext3_xattr_set_handle(handle, inode,
 502                                                 EXT3_XATTR_INDEX_LUSTRE,
 503                                                 XATTR_LUSTRE_MDS_OBJID,
 504                                                 NULL, 0, 0);
 505                 if (err)
 506                         CERROR("error deleting old LOV EA on %lu/%u: rc %d\n",
 507                                inode->i_ino, inode->i_generation, err);
 508         }
 509 #endif
 510         unlock_kernel();
 511
 512         if (rc)
 513                 CERROR("error adding MD data to inode %lu: rc = %d\n",
 514                        inode->i_ino, rc);
 515         return rc;
 516 }
 517
 518 /* Must be called with i_sem held */
 519 static int fsfilt_ext3_get_md(struct inode *inode, void *lmm, int lmm_size)
 520 {
 521         int rc;
 522
 523         LASSERT(down_trylock(&inode->i_sem) != 0);
 524         lock_kernel();
 525         /* Keep support for reading "inline EAs" until we convert
 526          * users over to new format entirely.  See bug 841/2097. */
 527         if (inode->i_blocks == 0 && EXT3_I(inode)->i_data[0]) {
 528                 unsigned size = le32_to_cpu(EXT3_I(inode)->i_data[0]);
 529                 void *handle;
 530
 531                 LASSERT(size < sizeof(EXT3_I(inode)->i_data));
 532                 if (lmm) {
 533                         if (size > lmm_size) {
 534                                 CERROR("inline EA on %lu/%u bad size %u > %u\n",
 535                                        inode->i_ino, inode->i_generation,
 536                                        size, lmm_size);
 537                                 return -ERANGE;
 538                         }
 539                         memcpy(lmm, &EXT3_I(inode)->i_data[1], size);
 540                 }
 541
 542 #ifndef INLINE_EA
 543                 /* migrate LOV EA data to external block - keep same format */
 544                 CWARN("DEBUG: migrate inline EA for inode %lu/%u to block\n",
 545                       inode->i_ino, inode->i_generation);
 546
 547                 handle = journal_start(EXT3_JOURNAL(inode),
 548                                        EXT3_XATTR_TRANS_BLOCKS);
 549                 if (!IS_ERR(handle)) {
 550                         int err;
 551                         rc = fsfilt_ext3_set_md(inode, handle,
 552                                                 &EXT3_I(inode)->i_data[1],size);
 553                         if (rc == 0) {
 554                                 memset(EXT3_I(inode)->i_data, 0,
 555                                        sizeof(EXT3_I(inode)->i_data));
 556                                 mark_inode_dirty(inode);
 557                         }
 558                         err = journal_stop(handle);
 559                         if (err && rc == 0)
 560                                 rc = err;
 561                 } else {
 562                         rc = PTR_ERR(handle);
 563                 }
 564 #endif
 565                 unlock_kernel();
 566                 return size;
 567         }
 568
 569         rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
 570                             XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size);
 571         /* try old EA type if new one failed - MDS will convert it for us */
 572         if (rc == -ENODATA) {
 573                 CDEBUG(D_INFO,"failed new LOV EA %d/%s from inode %lu: rc %d\n",
 574                        EXT3_XATTR_INDEX_TRUSTED, XATTR_LUSTRE_MDS_LOV_EA,
 575                        inode->i_ino, rc);
 576
 577                 rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_LUSTRE,
 578                                     XATTR_LUSTRE_MDS_OBJID, lmm, lmm_size);
 579         }
 580         unlock_kernel();
 581
 582         /* This gives us the MD size */
 583         if (lmm == NULL)
 584                 return (rc == -ENODATA) ? 0 : rc;
 585
 586         if (rc < 0) {
 587                 CDEBUG(D_INFO, "error getting EA %d/%s from inode %lu: rc %d\n",
 588                        EXT3_XATTR_INDEX_LUSTRE, XATTR_LUSTRE_MDS_OBJID,
 589                        inode->i_ino, rc);
 590                 memset(lmm, 0, lmm_size);
 591                 return (rc == -ENODATA) ? 0 : rc;
 592         }
 593
 594         return rc;
 595 }
 596
 597 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 598 static int fsfilt_ext3_send_bio(int rw, struct inode *inode, struct bio *bio)
 599 {
 600         submit_bio(rw, bio);
 601         return 0;
 602 }
 603 #else
 604 static int fsfilt_ext3_send_bio(int rw, struct inode *inode, struct kiobuf *bio)
 605 {
 606         int rc, blocks_per_page;
 607
 608         rc = brw_kiovec(rw, 1, &bio, inode->i_dev,
 609                         bio->blocks, 1 << inode->i_blkbits);
 610
 611         blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 612
 613         if (rc != (1 << inode->i_blkbits) * bio->nr_pages * blocks_per_page) {
 614                 CERROR("short write?  expected %d, wrote %d\n",
 615                        (1 << inode->i_blkbits) * bio->nr_pages *
 616                        blocks_per_page, rc);
 617         }
 618
 619         return rc;
 620 }
 621 #endif
 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_rcvd, 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, __u64 last_rcvd,
 690                                       void *handle, fsfilt_cb_t cb_func,
 691                                       void *cb_data)
 692 {
 693         struct fsfilt_cb_data *fcb;
 694
 695         OBD_SLAB_ALLOC(fcb, fcb_cache, GFP_NOFS, sizeof *fcb);
 696         if (fcb == NULL)
 697                 RETURN(-ENOMEM);
 698
 699         atomic_inc(&fcb_cache_count);
 700         fcb->cb_func = cb_func;
 701         fcb->cb_obd = obd;
 702         fcb->cb_last_rcvd = last_rcvd;
 703         fcb->cb_data = cb_data;
 704
 705         CDEBUG(D_EXT2, "set callback for last_rcvd: "LPD64"\n", last_rcvd);
 706         lock_24kernel();
 707         journal_callback_set(handle, fsfilt_ext3_cb_func,
 708                              (struct journal_callback *)fcb);
 709         unlock_24kernel();
 710
 711         return 0;
 712 }
 713
 714 /*
 715  * We need to hack the return value for the free inode counts because
 716  * the current EA code requires one filesystem block per inode with EAs,
 717  * so it is possible to run out of blocks before we run out of inodes.
 718  *
 719  * This can be removed when the ext3 EA code is fixed.
 720  */
 721 static int fsfilt_ext3_statfs(struct super_block *sb, struct obd_statfs *osfs)
 722 {
 723         struct kstatfs sfs;
 724         int rc;
 725
 726         memset(&sfs, 0, sizeof(sfs));
 727
 728         rc = sb->s_op->statfs(sb, &sfs);
 729
 730         if (!rc && sfs.f_bfree < sfs.f_ffree) {
 731                 sfs.f_files = (sfs.f_files - sfs.f_ffree) + sfs.f_bfree;
 732                 sfs.f_ffree = sfs.f_bfree;
 733         }
 734
 735         statfs_pack(osfs, &sfs);
 736         return rc;
 737 }
 738
 739 static int fsfilt_ext3_sync(struct super_block *sb)
 740 {
 741         return ext3_force_commit(sb);
 742 }
 743
 744 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
 745 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 746 #define ext3_up_truncate_sem(inode)  up_write(&EXT3_I(inode)->truncate_sem);
 747 #define ext3_down_truncate_sem(inode)  down_write(&EXT3_I(inode)->truncate_sem);
 748 #else
 749 #define ext3_up_truncate_sem(inode)  up(&EXT3_I(inode)->truncate_sem);
 750 #define ext3_down_truncate_sem(inode)  down(&EXT3_I(inode)->truncate_sem);
 751 #endif
 752
 753 #include <linux/lustre_version.h>
 754 #if EXT3_EXT_MAGIC == 0xf301
 755 #define ee_start e_start
 756 #define ee_block e_block
 757 #define ee_len   e_num
 758 #endif
 759 #ifndef EXT3_BB_MAX_BLOCKS
 760 #define ext3_mb_new_blocks(handle, inode, goal, count, aflags, err) \
 761         ext3_new_blocks(handle, inode, count, goal, err)
 762 #endif
 763
 764 struct bpointers {
 765         unsigned long *blocks;
 766         int *created;
 767         unsigned long start;
 768         int num;
 769         int init_num;
 770         int create;
 771 };
 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                         if (ex->ee_block + ex->ee_len == block)
 794                                 *aflags |= 1;
 795 #endif
 796                         return ex->ee_start + (block - ex->ee_block);
 797                 }
 798
 799                 /* it looks index is empty
 800                  * try to find starting from index itself */
 801                 if (path[depth].p_bh)
 802                         return path[depth].p_bh->b_blocknr;
 803         }
 804
 805         /* OK. use inode's group */
 806         bg_start = (ei->i_block_group * EXT3_BLOCKS_PER_GROUP(inode->i_sb)) +
 807                 le32_to_cpu(EXT3_SB(inode->i_sb)->s_es->s_first_data_block);
 808         colour = (current->pid % 16) *
 809                         (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16);
 810         return bg_start + colour + block;
 811 }
 812
 813 static int ext3_ext_new_extent_cb(struct ext3_extents_tree *tree,
 814                                   struct ext3_ext_path *path,
 815                                   struct ext3_extent *newex, int exist)
 816 {
 817         struct inode *inode = tree->inode;
 818         struct bpointers *bp = tree->private;
 819         int count, err, goal;
 820         unsigned long pblock;
 821         unsigned long tgen;
 822         loff_t new_i_size;
 823         handle_t *handle;
 824         int i, aflags = 0;
 825
 826         i = EXT_DEPTH(tree);
 827         EXT_ASSERT(i == path->p_depth);
 828         EXT_ASSERT(path[i].p_hdr);
 829
 830         if (exist) {
 831                 err = EXT_CONTINUE;
 832                 goto map;
 833         }
 834
 835         if (bp->create == 0) {
 836                 i = 0;
 837                 if (newex->ee_block < bp->start)
 838                         i = bp->start - newex->ee_block;
 839                 if (i >= newex->ee_len)
 840                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 841                                         i, newex->ee_len);
 842                 for (; i < newex->ee_len && bp->num; i++) {
 843                         *(bp->created) = 0;
 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
 855         tgen = EXT_GENERATION(tree);
 856         count = ext3_ext_calc_credits_for_insert(tree, path);
 857         ext3_up_truncate_sem(inode);
 858
 859         lock_24kernel();
 860         handle = journal_start(EXT3_JOURNAL(inode), count + EXT3_ALLOC_NEEDED + 1);
 861         unlock_24kernel();
 862         if (IS_ERR(handle)) {
 863                 ext3_down_truncate_sem(inode);
 864                 return PTR_ERR(handle);
 865         }
 866
 867         if (tgen != EXT_GENERATION(tree)) {
 868                 /* the tree has changed. so path can be invalid at moment */
 869                 lock_24kernel();
 870                 journal_stop(handle);
 871                 unlock_24kernel();
 872                 ext3_down_truncate_sem(inode);
 873                 return EXT_REPEAT;
 874         }
 875
 876         ext3_down_truncate_sem(inode);
 877         count = newex->ee_len;
 878         goal = ext3_ext_find_goal(inode, path, newex->ee_block, &aflags);
 879         aflags |= 2; /* block have been already reserved */
 880         pblock = ext3_mb_new_blocks(handle, inode, goal, &count, aflags, &err);
 881         if (!pblock)
 882                 goto out;
 883         EXT_ASSERT(count <= newex->ee_len);
 884
 885         /* insert new extent */
 886         newex->ee_start = pblock;
 887         newex->ee_len = count;
 888         err = ext3_ext_insert_extent(handle, tree, path, newex);
 889         if (err)
 890                 goto out;
 891
 892         /* correct on-disk inode size */
 893         if (newex->ee_len > 0) {
 894                 new_i_size = (loff_t) newex->ee_block + newex->ee_len;
 895                 new_i_size = new_i_size << inode->i_blkbits;
 896                 if (new_i_size > EXT3_I(inode)->i_disksize) {
 897                         EXT3_I(inode)->i_disksize = new_i_size;
 898                         err = ext3_mark_inode_dirty(handle, inode);
 899                 }
 900         }
 901
 902 out:
 903         lock_24kernel();
 904         journal_stop(handle);
 905         unlock_24kernel();
 906 map:
 907         if (err >= 0) {
 908                 /* map blocks */
 909                 if (bp->num == 0) {
 910                         CERROR("hmm. why do we find this extent?\n");
 911                         CERROR("initial space: %lu:%u\n",
 912                                 bp->start, bp->init_num);
 913                         CERROR("current extent: %u/%u/%u %d\n",
 914                                 newex->ee_block, newex->ee_len,
 915                                 newex->ee_start, exist);
 916                 }
 917                 i = 0;
 918                 if (newex->ee_block < bp->start)
 919                         i = bp->start - newex->ee_block;
 920                 if (i >= newex->ee_len)
 921                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 922                                         i, newex->ee_len);
 923                 for (; i < newex->ee_len && bp->num; i++) {
 924                         *(bp->created) = (exist == 0 ? 1 : 0);
 925                         bp->created++;
 926                         *(bp->blocks) = newex->ee_start + i;
 927                         bp->blocks++;
 928                         bp->num--;
 929                         bp->start++;
 930                 }
 931         }
 932         return err;
 933 }
 934
 935 int fsfilt_map_nblocks(struct inode *inode, unsigned long block,
 936                        unsigned long num, unsigned long *blocks,
 937                        int *created, int create)
 938 {
 939         struct ext3_extents_tree tree;
 940         struct bpointers bp;
 941         int err;
 942
 943         CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
 944                 block, block + num, (unsigned) inode->i_ino);
 945
 946         ext3_init_tree_desc(&tree, inode);
 947         tree.private = &bp;
 948         bp.blocks = blocks;
 949         bp.created = created;
 950         bp.start = block;
 951         bp.init_num = bp.num = num;
 952         bp.create = create;
 953
 954         ext3_down_truncate_sem(inode);
 955         err = ext3_ext_walk_space(&tree, block, num, ext3_ext_new_extent_cb);
 956         ext3_ext_invalidate_cache(&tree);
 957         ext3_up_truncate_sem(inode);
 958
 959         return err;
 960 }
 961
 962 int fsfilt_ext3_map_ext_inode_pages(struct inode *inode, struct page **page,
 963                                     int pages, unsigned long *blocks,
 964                                     int *created, int create)
 965 {
 966         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 967         int rc = 0, i = 0;
 968         struct page *fp = NULL;
 969         int clen = 0;
 970
 971         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
 972                 inode->i_ino, pages, (*page)->index);
 973
 974         /* pages are sorted already. so, we just have to find
 975          * contig. space and process them properly */
 976         while (i < pages) {
 977                 if (fp == NULL) {
 978                         /* start new extent */
 979                         fp = *page++;
 980                         clen = 1;
 981                         i++;
 982                         continue;
 983                 } else if (fp->index + clen == (*page)->index) {
 984                         /* continue the extent */
 985                         page++;
 986                         clen++;
 987                         i++;
 988                         continue;
 989                 }
 990
 991                 /* process found extent */
 992                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
 993                                         clen * blocks_per_page, blocks,
 994                                         created, create);
 995                 if (rc)
 996                         GOTO(cleanup, rc);
 997
 998                 /* look for next extent */
 999                 fp = NULL;
1000                 blocks += blocks_per_page * clen;
1001                 created += blocks_per_page * clen;
1002         }
1003
1004         if (fp)
1005                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
1006                                         clen * blocks_per_page, blocks,
1007                                         created, create);
1008 cleanup:
1009         return rc;
1010 }
1011 #endif
1012
1013 extern int ext3_map_inode_page(struct inode *inode, struct page *page,
1014                                unsigned long *blocks, int *created, int create);
1015 int fsfilt_ext3_map_bm_inode_pages(struct inode *inode, struct page **page,
1016                                    int pages, unsigned long *blocks,
1017                                    int *created, int create)
1018 {
1019         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
1020         unsigned long *b;
1021         int rc = 0, i, *cr;
1022
1023         for (i = 0, cr = created, b = blocks; i < pages; i++, page++) {
1024                 rc = ext3_map_inode_page(inode, *page, b, cr, create);
1025                 if (rc) {
1026                         CERROR("ino %lu, blk %lu cr %u create %d: rc %d\n",
1027                                inode->i_ino, *b, *cr, create, rc);
1028                         break;
1029                 }
1030
1031                 b += blocks_per_page;
1032                 cr += blocks_per_page;
1033         }
1034         return rc;
1035 }
1036
1037 int fsfilt_ext3_map_inode_pages(struct inode *inode, struct page **page,
1038                                 int pages, unsigned long *blocks,
1039                                 int *created, int create,
1040                                 struct semaphore *optional_sem)
1041 {
1042         int rc;
1043 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
1044         if (EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL) {
1045                 rc = fsfilt_ext3_map_ext_inode_pages(inode, page, pages,
1046                                                      blocks, created, create);
1047                 return rc;
1048         }
1049 #endif
1050         if (optional_sem != NULL)
1051                 down(optional_sem);
1052         rc = fsfilt_ext3_map_bm_inode_pages(inode, page, pages, blocks,
1053                                             created, create);
1054         if (optional_sem != NULL)
1055                 up(optional_sem);
1056
1057         return rc;
1058 }
1059
1060 extern int ext3_prep_san_write(struct inode *inode, long *blocks,
1061                                int nblocks, loff_t newsize);
1062 static int fsfilt_ext3_prep_san_write(struct inode *inode, long *blocks,
1063                                       int nblocks, loff_t newsize)
1064 {
1065         return ext3_prep_san_write(inode, blocks, nblocks, newsize);
1066 }
1067
1068 static int fsfilt_ext3_read_record(struct file * file, void *buf,
1069                                    int size, loff_t *offs)
1070 {
1071         struct inode *inode = file->f_dentry->d_inode;
1072         unsigned long block;
1073         struct buffer_head *bh;
1074         int err, blocksize, csize, boffs;
1075
1076         /* prevent reading after eof */
1077         lock_kernel();
1078         if (inode->i_size < *offs + size) {
1079                 size = inode->i_size - *offs;
1080                 unlock_kernel();
1081                 if (size < 0) {
1082                         CERROR("size %llu is too short for read %u@%llu\n",
1083                                inode->i_size, size, *offs);
1084                         return -EIO;
1085                 } else if (size == 0) {
1086                         return 0;
1087                 }
1088         } else {
1089                 unlock_kernel();
1090         }
1091
1092         blocksize = 1 << inode->i_blkbits;
1093
1094         while (size > 0) {
1095                 block = *offs >> inode->i_blkbits;
1096                 boffs = *offs & (blocksize - 1);
1097                 csize = min(blocksize - boffs, size);
1098                 bh = ext3_bread(NULL, inode, block, 0, &err);
1099                 if (!bh) {
1100                         CERROR("can't read block: %d\n", err);
1101                         return err;
1102                 }
1103
1104                 memcpy(buf, bh->b_data + boffs, csize);
1105                 brelse(bh);
1106
1107                 *offs += csize;
1108                 buf += csize;
1109                 size -= csize;
1110         }
1111         return 0;
1112 }
1113
1114 static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
1115                                     loff_t *offs, int force_sync)
1116 {
1117         struct buffer_head *bh = NULL;
1118         unsigned long block;
1119         struct inode *inode = file->f_dentry->d_inode;
1120         loff_t old_size = inode->i_size, offset = *offs;
1121         loff_t new_size = inode->i_size;
1122         journal_t *journal;
1123         handle_t *handle;
1124         int err, block_count = 0, blocksize, size, boffs;
1125
1126         /* Determine how many transaction credits are needed */
1127         blocksize = 1 << inode->i_blkbits;
1128         block_count = (*offs & (blocksize - 1)) + bufsize;
1129         block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
1130
1131         journal = EXT3_SB(inode->i_sb)->s_journal;
1132         lock_24kernel();
1133         handle = journal_start(journal,
1134                                block_count * EXT3_DATA_TRANS_BLOCKS + 2);
1135         unlock_24kernel();
1136         if (IS_ERR(handle)) {
1137                 CERROR("can't start transaction\n");
1138                 return PTR_ERR(handle);
1139         }
1140
1141         while (bufsize > 0) {
1142                 if (bh != NULL)
1143                         brelse(bh);
1144
1145                 block = offset >> inode->i_blkbits;
1146                 boffs = offset & (blocksize - 1);
1147                 size = min(blocksize - boffs, bufsize);
1148                 bh = ext3_bread(handle, inode, block, 1, &err);
1149                 if (!bh) {
1150                         CERROR("can't read/create block: %d\n", err);
1151                         goto out;
1152                 }
1153
1154                 err = ext3_journal_get_write_access(handle, bh);
1155                 if (err) {
1156                         CERROR("journal_get_write_access() returned error %d\n",
1157                                err);
1158                         goto out;
1159                 }
1160                 LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
1161                 memcpy(bh->b_data + boffs, buf, size);
1162                 err = ext3_journal_dirty_metadata(handle, bh);
1163                 if (err) {
1164                         CERROR("journal_dirty_metadata() returned error %d\n",
1165                                err);
1166                         goto out;
1167                 }
1168                 if (offset + size > new_size)
1169                         new_size = offset + size;
1170                 offset += size;
1171                 bufsize -= size;
1172                 buf += size;
1173         }
1174
1175         if (force_sync)
1176                 handle->h_sync = 1; /* recovery likes this */
1177 out:
1178         if (bh)
1179                 brelse(bh);
1180
1181         /* correct in-core and on-disk sizes */
1182         if (new_size > inode->i_size) {
1183                 lock_kernel();
1184                 if (new_size > inode->i_size)
1185                         inode->i_size = new_size;
1186                 if (inode->i_size > EXT3_I(inode)->i_disksize)
1187                         EXT3_I(inode)->i_disksize = inode->i_size;
1188                 if (inode->i_size > old_size)
1189                         mark_inode_dirty(inode);
1190                 unlock_kernel();
1191         }
1192
1193         lock_24kernel();
1194         journal_stop(handle);
1195         unlock_24kernel();
1196
1197         if (err == 0)
1198                 *offs = offset;
1199         return err;
1200 }
1201
1202 static int fsfilt_ext3_setup(struct super_block *sb)
1203 {
1204 #if 0
1205         EXT3_SB(sb)->dx_lock = fsfilt_ext3_dx_lock;
1206         EXT3_SB(sb)->dx_unlock = fsfilt_ext3_dx_unlock;
1207 #endif
1208 #ifdef S_PDIROPS
1209         CWARN("Enabling PDIROPS\n");
1210         set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
1211         sb->s_flags |= S_PDIROPS;
1212 #endif
1213         return 0;
1214 }
1215
1216 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
1217    objects. Logs is number of logfiles to update */
1218 static int fsfilt_ext3_get_op_len(int op, struct fsfilt_objinfo *fso, int logs)
1219 {
1220         if ( !fso ) {
1221                 switch(op) {
1222                 case FSFILT_OP_CREATE:
1223                                  /* directory leaf, index & indirect & EA*/
1224                         return 4 + 3 * logs;
1225                 case FSFILT_OP_UNLINK:
1226                         return 3 * logs;
1227                 }
1228         } else {
1229                 int i;
1230                 int needed = 0;
1231                 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
1232                 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
1233                 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
1234                 for (i = 0; i < op; i++, fso++) {
1235                         int nblocks = fso->fso_bufcnt * blockpp;
1236                         int ndindirect = min(nblocks, addrpp + 1);
1237                         int nindir = nblocks + ndindirect + 1;
1238
1239                         needed += nindir;
1240                 }
1241                 return needed + 3 * logs;
1242         }
1243
1244         return 0;
1245 }
1246
1247 static struct fsfilt_operations fsfilt_ext3_ops = {
1248         .fs_type                = "ext3",
1249         .fs_owner               = THIS_MODULE,
1250         .fs_start               = fsfilt_ext3_start,
1251         .fs_brw_start           = fsfilt_ext3_brw_start,
1252         .fs_commit              = fsfilt_ext3_commit,
1253         .fs_commit_async        = fsfilt_ext3_commit_async,
1254         .fs_commit_wait         = fsfilt_ext3_commit_wait,
1255         .fs_setattr             = fsfilt_ext3_setattr,
1256         .fs_iocontrol           = fsfilt_ext3_iocontrol,
1257         .fs_set_md              = fsfilt_ext3_set_md,
1258         .fs_get_md              = fsfilt_ext3_get_md,
1259         .fs_readpage            = fsfilt_ext3_readpage,
1260         .fs_add_journal_cb      = fsfilt_ext3_add_journal_cb,
1261         .fs_statfs              = fsfilt_ext3_statfs,
1262         .fs_sync                = fsfilt_ext3_sync,
1263         .fs_map_inode_pages     = fsfilt_ext3_map_inode_pages,
1264         .fs_prep_san_write      = fsfilt_ext3_prep_san_write,
1265         .fs_write_record        = fsfilt_ext3_write_record,
1266         .fs_read_record         = fsfilt_ext3_read_record,
1267         .fs_setup               = fsfilt_ext3_setup,
1268         .fs_send_bio            = fsfilt_ext3_send_bio,
1269         .fs_get_op_len          = fsfilt_ext3_get_op_len,
1270 };
1271
1272 static int __init fsfilt_ext3_init(void)
1273 {
1274         int rc;
1275
1276         fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
1277                                       sizeof(struct fsfilt_cb_data), 0,
1278                                       0, NULL, NULL);
1279         if (!fcb_cache) {
1280                 CERROR("error allocating fsfilt journal callback cache\n");
1281                 GOTO(out, rc = -ENOMEM);
1282         }
1283
1284         rc = fsfilt_register_ops(&fsfilt_ext3_ops);
1285
1286         if (rc)
1287                 kmem_cache_destroy(fcb_cache);
1288 out:
1289         return rc;
1290 }
1291
1292 static void __exit fsfilt_ext3_exit(void)
1293 {
1294         fsfilt_unregister_ops(&fsfilt_ext3_ops);
1295         LASSERTF(kmem_cache_destroy(fcb_cache) == 0,
1296                  "can't free fsfilt callback cache: count %d\n",
1297                  atomic_read(&fcb_cache_count));
1298 }
1299
1300 module_init(fsfilt_ext3_init);
1301 module_exit(fsfilt_ext3_exit);
1302
1303 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1304 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
1305 MODULE_LICENSE("GPL");