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 <linux/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 static kmem_cache_t *fcb_cache;
  56 static atomic_t fcb_cache_count = ATOMIC_INIT(0);
  57
  58 struct fsfilt_cb_data {
  59         struct journal_callback cb_jcb; /* jbd private data - MUST BE FIRST */
  60         fsfilt_cb_t cb_func;            /* MDS/OBD completion function */
  61         struct obd_device *cb_obd;      /* MDS/OBD completion device */
  62         __u64 cb_last_rcvd;             /* MDS/OST last committed operation */
  63         void *cb_data;                  /* MDS/OST completion function data */
  64 };
  65
  66 #ifndef EXT3_XATTR_INDEX_TRUSTED        /* temporary until we hit l28 kernel */
  67 #define EXT3_XATTR_INDEX_TRUSTED        4
  68 #endif
  69 #define XATTR_LUSTRE_MDS_LOV_EA         "lov"
  70
  71 /*
  72  * We don't currently need any additional blocks for rmdir and
  73  * unlink transactions because we are storing the OST oa_id inside
  74  * the inode (which we will be changing anyways as part of this
  75  * transaction).
  76  */
  77 static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
  78                                int logs)
  79 {
  80         /* For updates to the last recieved file */
  81         int nblocks = EXT3_SINGLEDATA_TRANS_BLOCKS;
  82         journal_t *journal;
  83         void *handle;
  84
  85         if (current->journal_info) {
  86                 CDEBUG(D_INODE, "increasing refcount on %p\n",
  87                        current->journal_info);
  88                 goto journal_start;
  89         }
  90
  91         /* XXX BUG 3188 -- must return to one set of opcodes */
  92         /* FIXME - cache hook */
  93         if (op & 0x20) {
  94                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
  95                 op = op & ~0x20;
  96         }
  97
  98         /* FIXME - kml */
  99         if (op & 0x10) {
 100                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
 101                 op = op & ~0x10;
 102         }
 103
 104         switch(op) {
 105         case FSFILT_OP_RMDIR:
 106         case FSFILT_OP_UNLINK:
 107                 /* delete one file + create/update logs for each stripe */
 108                 nblocks += EXT3_DELETE_TRANS_BLOCKS;
 109                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 110                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 111                 break;
 112         case FSFILT_OP_RENAME:
 113                 /* modify additional directory */
 114                 nblocks += EXT3_SINGLEDATA_TRANS_BLOCKS;
 115                 /* no break */
 116         case FSFILT_OP_SYMLINK:
 117                 /* additional block + block bitmap + GDT for long symlink */
 118                 nblocks += 3;
 119                 /* no break */
 120         case FSFILT_OP_CREATE:
 121                 /* create/update logs for each stripe */
 122                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 123                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 124                 /* no break */
 125         case FSFILT_OP_MKDIR:
 126         case FSFILT_OP_MKNOD:
 127                 /* modify one inode + block bitmap + GDT */
 128                 nblocks += 3;
 129                 /* no break */
 130         case FSFILT_OP_LINK:
 131                 /* modify parent directory */
 132                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 133                         EXT3_DATA_TRANS_BLOCKS;
 134                 break;
 135         case FSFILT_OP_SETATTR:
 136                 /* Setattr on inode */
 137                 nblocks += 1;
 138                 break;
 139         case FSFILT_OP_CANCEL_UNLINK:
 140                 /* blocks for log header bitmap update OR
 141                  * blocks for catalog header bitmap update + unlink of logs */
 142                 nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
 143                         EXT3_DELETE_TRANS_BLOCKS * logs;
 144                 break;
 145         case FSFILT_OP_NOOP:
 146                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
 147                 break;
 148         default: CERROR("unknown transaction start op %d\n", op);
 149                 LBUG();
 150         }
 151
 152         LASSERT(current->journal_info == desc_private);
 153         journal = EXT3_SB(inode->i_sb)->s_journal;
 154         if (nblocks > journal->j_max_transaction_buffers) {
 155                 CERROR("too many credits %d for op %ux%u using %d instead\n",
 156                        nblocks, op, logs, journal->j_max_transaction_buffers);
 157                 nblocks = journal->j_max_transaction_buffers;
 158         }
 159
 160  journal_start:
 161         lock_kernel();
 162         handle = journal_start(EXT3_JOURNAL(inode), nblocks);
 163         unlock_kernel();
 164
 165         if (!IS_ERR(handle))
 166                 LASSERT(current->journal_info == handle);
 167         else
 168                 CERROR("error starting handle for op %u (%u credits): rc %ld\n",
 169                        op, nblocks, PTR_ERR(handle));
 170         return handle;
 171 }
 172
 173 /*
 174  * Calculate the number of buffer credits needed to write multiple pages in
 175  * a single ext3 transaction.  No, this shouldn't be here, but as yet ext3
 176  * doesn't have a nice API for calculating this sort of thing in advance.
 177  *
 178  * See comment above ext3_writepage_trans_blocks for details.  We assume
 179  * no data journaling is being done, but it does allow for all of the pages
 180  * being non-contiguous.  If we are guaranteed contiguous pages we could
 181  * reduce the number of (d)indirect blocks a lot.
 182  *
 183  * With N blocks per page and P pages, for each inode we have at most:
 184  * N*P indirect
 185  * min(N*P, blocksize/4 + 1) dindirect blocks
 186  * niocount tindirect
 187  *
 188  * For the entire filesystem, we have at most:
 189  * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
 190  * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
 191  * objcount inode blocks
 192  * 1 superblock
 193  * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
 194  *
 195  * 1 EXT3_DATA_TRANS_BLOCKS for the last_rcvd update.
 196  */
 197 static int fsfilt_ext3_credits_needed(int objcount, struct fsfilt_objinfo *fso,
 198                                       int niocount, struct niobuf_local *nb)
 199 {
 200         struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
 201         __u64 next_indir;
 202         const int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
 203         int nbitmaps = 0, ngdblocks;
 204         int needed = objcount + 1; /* inodes + superblock */
 205         int i, j;
 206
 207         for (i = 0, j = 0; i < objcount; i++, fso++) {
 208                 /* two or more dindirect blocks in case we cross boundary */
 209                 int ndind = (long)((nb[j + fso->fso_bufcnt - 1].offset -
 210                                     nb[j].offset) >>
 211                                    sb->s_blocksize_bits) /
 212                         (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb));
 213                 nbitmaps += min(fso->fso_bufcnt, ndind > 0 ? ndind : 2);
 214
 215                 /* leaf, indirect, tindirect blocks for first block */
 216                 nbitmaps += blockpp + 2;
 217
 218                 j += fso->fso_bufcnt;
 219         }
 220
 221         next_indir = nb[0].offset +
 222                 (EXT3_ADDR_PER_BLOCK(sb) << sb->s_blocksize_bits);
 223         for (i = 1; i < niocount; i++) {
 224                 if (nb[i].offset >= next_indir) {
 225                         nbitmaps++;     /* additional indirect */
 226                         next_indir = nb[i].offset +
 227                                 (EXT3_ADDR_PER_BLOCK(sb)<<sb->s_blocksize_bits);
 228                 } else if (nb[i].offset != nb[i - 1].offset + sb->s_blocksize) {
 229                         nbitmaps++;     /* additional indirect */
 230                 }
 231                 nbitmaps += blockpp;    /* each leaf in different group? */
 232         }
 233
 234         ngdblocks = nbitmaps;
 235         if (nbitmaps > EXT3_SB(sb)->s_groups_count)
 236                 nbitmaps = EXT3_SB(sb)->s_groups_count;
 237         if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
 238                 ngdblocks = EXT3_SB(sb)->s_gdb_count;
 239
 240         needed += nbitmaps + ngdblocks;
 241
 242         /* last_rcvd update */
 243         needed += EXT3_DATA_TRANS_BLOCKS;
 244
 245 #if defined(CONFIG_QUOTA) && !defined(__x86_64__) /* XXX */
 246         /* We assume that there will be 1 bit set in s_dquot.flags for each
 247          * quota file that is active.  This is at least true for now.
 248          */
 249         needed += hweight32(sb_any_quota_enabled(sb)) *
 250                 EXT3_SINGLEDATA_TRANS_BLOCKS;
 251 #endif
 252
 253         return needed;
 254 }
 255
 256 /* We have to start a huge journal transaction here to hold all of the
 257  * metadata for the pages being written here.  This is necessitated by
 258  * the fact that we do lots of prepare_write operations before we do
 259  * any of the matching commit_write operations, so even if we split
 260  * up to use "smaller" transactions none of them could complete until
 261  * all of them were opened.  By having a single journal transaction,
 262  * we eliminate duplicate reservations for common blocks like the
 263  * superblock and group descriptors or bitmaps.
 264  *
 265  * We will start the transaction here, but each prepare_write will
 266  * add a refcount to the transaction, and each commit_write will
 267  * remove a refcount.  The transaction will be closed when all of
 268  * the pages have been written.
 269  */
 270 static void *fsfilt_ext3_brw_start(int objcount, struct fsfilt_objinfo *fso,
 271                                    int niocount, struct niobuf_local *nb,
 272                                    void *desc_private, int logs)
 273 {
 274         journal_t *journal;
 275         handle_t *handle;
 276         int needed;
 277         ENTRY;
 278
 279         LASSERT(current->journal_info == desc_private);
 280         journal = EXT3_SB(fso->fso_dentry->d_inode->i_sb)->s_journal;
 281         needed = fsfilt_ext3_credits_needed(objcount, fso, niocount, nb);
 282
 283         /* The number of blocks we could _possibly_ dirty can very large.
 284          * We reduce our request if it is absurd (and we couldn't get that
 285          * many credits for a single handle anyways).
 286          *
 287          * At some point we have to limit the size of I/Os sent at one time,
 288          * increase the size of the journal, or we have to calculate the
 289          * actual journal requirements more carefully by checking all of
 290          * the blocks instead of being maximally pessimistic.  It remains to
 291          * be seen if this is a real problem or not.
 292          */
 293         if (needed > journal->j_max_transaction_buffers) {
 294                 CERROR("want too many journal credits (%d) using %d instead\n",
 295                        needed, journal->j_max_transaction_buffers);
 296                 needed = journal->j_max_transaction_buffers;
 297         }
 298
 299         lock_kernel();
 300         handle = journal_start(journal, needed);
 301         unlock_kernel();
 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 super_block *sb, struct inode *inode,
 314                               void *h, int force_sync)
 315 {
 316         int rc;
 317         handle_t *handle = h;
 318
 319         LASSERT(current->journal_info == handle);
 320         if (force_sync)
 321                 handle->h_sync = 1; /* recovery likes this */
 322
 323         lock_kernel();
 324         rc = journal_stop(handle);
 325         unlock_kernel();
 326
 327         return rc;
 328 }
 329
 330 static int fsfilt_ext3_commit_async(struct inode *inode, void *h,
 331                                     void **wait_handle)
 332 {
 333         unsigned long tid;
 334         transaction_t *transaction;
 335 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 336         unsigned long rtid;
 337 #endif
 338         handle_t *handle = h;
 339         journal_t *journal;
 340         int rc;
 341
 342         LASSERT(current->journal_info == handle);
 343
 344         lock_kernel();
 345         transaction = handle->h_transaction;
 346         journal = transaction->t_journal;
 347         tid = transaction->t_tid;
 348         /* we don't want to be blocked */
 349         handle->h_sync = 0;
 350         rc = journal_stop(handle);
 351         if (rc) {
 352                 CERROR("error while stopping transaction: %d\n", rc);
 353                 unlock_kernel();
 354                 return rc;
 355         }
 356 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 357         rtid = log_start_commit(journal, transaction);
 358         if (rtid != tid)
 359                 CERROR("strange race: %lu != %lu\n",
 360                        (unsigned long) tid, (unsigned long) rtid);
 361 #else
 362         log_start_commit(journal, transaction->t_tid);
 363 #endif
 364         unlock_kernel();
 365
 366         *wait_handle = (void *) tid;
 367         CDEBUG(D_INODE, "commit async: %lu\n", (unsigned long) tid);
 368         return 0;
 369 }
 370
 371 static int fsfilt_ext3_commit_wait(struct inode *inode, void *h)
 372 {
 373         tid_t tid = (tid_t)(long)h;
 374
 375         CDEBUG(D_INODE, "commit wait: %lu\n", (unsigned long) tid);
 376         if (is_journal_aborted(EXT3_JOURNAL(inode)))
 377                 return -EIO;
 378
 379         log_wait_commit(EXT3_JOURNAL(inode), tid);
 380
 381         return 0;
 382 }
 383
 384 static int fsfilt_ext3_setattr(struct dentry *dentry, void *handle,
 385                                struct iattr *iattr, int do_trunc)
 386 {
 387         struct inode *inode = dentry->d_inode;
 388         int rc;
 389
 390         lock_kernel();
 391
 392         /* A _really_ horrible hack to avoid removing the data stored
 393          * in the block pointers; this is really the "small" stripe MD data.
 394          * We can avoid further hackery by virtue of the MDS file size being
 395          * zero all the time (which doesn't invoke block truncate at unlink
 396          * time), so we assert we never change the MDS file size from zero. */
 397         if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
 398                 /* ATTR_SIZE would invoke truncate: clear it */
 399                 iattr->ia_valid &= ~ATTR_SIZE;
 400                 EXT3_I(inode)->i_disksize = inode->i_size = iattr->ia_size;
 401
 402                 /* make sure _something_ gets set - so new inode
 403                  * goes to disk (probably won't work over XFS */
 404                 if (!(iattr->ia_valid & (ATTR_MODE | ATTR_MTIME | ATTR_CTIME))){
 405                         iattr->ia_valid |= ATTR_MODE;
 406                         iattr->ia_mode = inode->i_mode;
 407                 }
 408         }
 409
 410         /* Don't allow setattr to change file type */
 411         iattr->ia_mode = (inode->i_mode & S_IFMT)|(iattr->ia_mode & ~S_IFMT);
 412
 413         /* We set these flags on the client, but have already checked perms
 414          * so don't confuse inode_change_ok. */
 415         iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
 416
 417         if (inode->i_op->setattr) {
 418                 rc = inode->i_op->setattr(dentry, iattr);
 419         } else {
 420                 rc = inode_change_ok(inode, iattr);
 421                 if (!rc)
 422                         rc = inode_setattr(inode, iattr);
 423         }
 424
 425         unlock_kernel();
 426
 427         return rc;
 428 }
 429
 430 static int fsfilt_ext3_iocontrol(struct inode * inode, struct file *file,
 431                                  unsigned int cmd, unsigned long arg)
 432 {
 433         int rc = 0;
 434         ENTRY;
 435
 436         if (inode->i_fop->ioctl)
 437                 rc = inode->i_fop->ioctl(inode, file, cmd, arg);
 438         else
 439                 RETURN(-ENOTTY);
 440
 441         RETURN(rc);
 442 }
 443
 444 static int fsfilt_ext3_set_md(struct inode *inode, void *handle,
 445                               void *lmm, int lmm_size)
 446 {
 447         int rc;
 448
 449         /* keep this when we get rid of OLD_EA (too noisy during conversion) */
 450         if (EXT3_I(inode)->i_file_acl /* || large inode EA flag */)
 451                 CWARN("setting EA on %lu/%u again... interesting\n",
 452                        inode->i_ino, inode->i_generation);
 453
 454         lock_kernel();
 455         rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
 456                                    XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size, 0);
 457
 458         unlock_kernel();
 459
 460         if (rc)
 461                 CERROR("error adding MD data to inode %lu: rc = %d\n",
 462                        inode->i_ino, rc);
 463         return rc;
 464 }
 465
 466 /* Must be called with i_sem held */
 467 static int fsfilt_ext3_get_md(struct inode *inode, void *lmm, int lmm_size)
 468 {
 469         int rc;
 470
 471         LASSERT(down_trylock(&inode->i_sem) != 0);
 472         lock_kernel();
 473
 474         rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
 475                             XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size);
 476         unlock_kernel();
 477
 478         /* This gives us the MD size */
 479         if (lmm == NULL)
 480                 return (rc == -ENODATA) ? 0 : rc;
 481
 482         if (rc < 0) {
 483                 CDEBUG(D_INFO, "error getting EA %d/%s from inode %lu: rc %d\n",
 484                        EXT3_XATTR_INDEX_TRUSTED, XATTR_LUSTRE_MDS_LOV_EA,
 485                        inode->i_ino, rc);
 486                 memset(lmm, 0, lmm_size);
 487                 return (rc == -ENODATA) ? 0 : rc;
 488         }
 489
 490         return rc;
 491 }
 492
 493 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 494 static int fsfilt_ext3_send_bio(struct inode *inode, struct bio *bio)
 495 {
 496         submit_bio(WRITE, bio);
 497         return 0;
 498 }
 499 #else
 500 static int fsfilt_ext3_send_bio(struct inode *inode, struct kiobuf *bio)
 501 {
 502         int rc, blocks_per_page;
 503
 504         rc = brw_kiovec(WRITE, 1, &bio, inode->i_dev,
 505                         bio->blocks, 1 << inode->i_blkbits);
 506
 507         blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 508
 509         if (rc != (1 << inode->i_blkbits) * bio->nr_pages *
 510             blocks_per_page) {
 511                 CERROR("short write?  expected %d, wrote %d\n",
 512                        (1 << inode->i_blkbits) * bio->nr_pages *
 513                        blocks_per_page, rc);
 514         }
 515
 516         return rc;
 517 }
 518 #endif
 519
 520 /* FIXME-UMKA: This should be used in 2.6.x io code later. */
 521 static struct page *fsfilt_ext3_getpage(struct inode *inode, long int index)
 522 {
 523         int rc;
 524         struct page *page;
 525
 526         page = grab_cache_page(inode->i_mapping, index);
 527         if (page == NULL)
 528                 return ERR_PTR(-ENOMEM);
 529
 530         if (PageUptodate(page)) {
 531                 unlock_page(page);
 532                 return page;
 533         }
 534
 535         rc = inode->i_mapping->a_ops->readpage(NULL, page);
 536         if (rc < 0) {
 537                 page_cache_release(page);
 538                 return ERR_PTR(rc);
 539         }
 540
 541         return page;
 542 }
 543
 544 static ssize_t fsfilt_ext3_readpage(struct file *file, char *buf, size_t count,
 545                                     loff_t *off)
 546 {
 547         struct inode *inode = file->f_dentry->d_inode;
 548         int rc = 0;
 549
 550         if (S_ISREG(inode->i_mode))
 551                 rc = file->f_op->read(file, buf, count, off);
 552         else {
 553                 const int blkbits = inode->i_sb->s_blocksize_bits;
 554                 const int blksize = inode->i_sb->s_blocksize;
 555
 556                 CDEBUG(D_EXT2, "reading "LPSZ" at dir %lu+%llu\n",
 557                        count, inode->i_ino, *off);
 558                 while (count > 0) {
 559                         struct buffer_head *bh;
 560
 561                         bh = NULL;
 562                         if (*off < inode->i_size) {
 563                                 int err = 0;
 564
 565                                 bh = ext3_bread(NULL, inode, *off >> blkbits,
 566                                                 0, &err);
 567
 568                                 CDEBUG(D_EXT2, "read %u@%llu\n", blksize, *off);
 569
 570                                 if (bh) {
 571                                         memcpy(buf, bh->b_data, blksize);
 572                                         brelse(bh);
 573                                 } else if (err) {
 574                                         /* XXX in theory we should just fake
 575                                          * this buffer and continue like ext3,
 576                                          * especially if this is a partial read
 577                                          */
 578                                         CERROR("error read dir %lu+%llu: %d\n",
 579                                                inode->i_ino, *off, err);
 580                                         RETURN(err);
 581                                 }
 582                         }
 583                         if (!bh) {
 584                                 struct ext3_dir_entry_2 *fake = (void *)buf;
 585
 586                                 CDEBUG(D_EXT2, "fake %u@%llu\n", blksize, *off);
 587                                 memset(fake, 0, sizeof(*fake));
 588                                 fake->rec_len = cpu_to_le32(blksize);
 589                         }
 590                         count -= blksize;
 591                         buf += blksize;
 592                         *off += blksize;
 593                         rc += blksize;
 594                 }
 595         }
 596
 597         return rc;
 598 }
 599
 600 static void fsfilt_ext3_cb_func(struct journal_callback *jcb, int error)
 601 {
 602         struct fsfilt_cb_data *fcb = (struct fsfilt_cb_data *)jcb;
 603
 604         fcb->cb_func(fcb->cb_obd, fcb->cb_last_rcvd, fcb->cb_data, error);
 605
 606         OBD_SLAB_FREE(fcb, fcb_cache, sizeof *fcb);
 607         atomic_dec(&fcb_cache_count);
 608 }
 609
 610 static int fsfilt_ext3_add_journal_cb(struct obd_device *obd,
 611                                       struct super_block *sb,
 612                                       __u64 last_rcvd,
 613                                       void *handle, fsfilt_cb_t cb_func,
 614                                       void *cb_data)
 615 {
 616         struct fsfilt_cb_data *fcb;
 617
 618         OBD_SLAB_ALLOC(fcb, fcb_cache, GFP_NOFS, sizeof *fcb);
 619         if (fcb == NULL)
 620                 RETURN(-ENOMEM);
 621
 622         atomic_inc(&fcb_cache_count);
 623         fcb->cb_func = cb_func;
 624         fcb->cb_obd = obd;
 625         fcb->cb_last_rcvd = last_rcvd;
 626         fcb->cb_data = cb_data;
 627
 628         CDEBUG(D_EXT2, "set callback for last_rcvd: "LPD64"\n", last_rcvd);
 629         lock_kernel();
 630         journal_callback_set(handle, fsfilt_ext3_cb_func,
 631                              (struct journal_callback *)fcb);
 632         unlock_kernel();
 633
 634         return 0;
 635 }
 636
 637 /*
 638  * We need to hack the return value for the free inode counts because
 639  * the current EA code requires one filesystem block per inode with EAs,
 640  * so it is possible to run out of blocks before we run out of inodes.
 641  *
 642  * This can be removed when the ext3 EA code is fixed.
 643  */
 644 static int fsfilt_ext3_statfs(struct super_block *sb, struct obd_statfs *osfs)
 645 {
 646         struct kstatfs sfs;
 647         int rc;
 648
 649         memset(&sfs, 0, sizeof(sfs));
 650
 651         rc = sb->s_op->statfs(sb, &sfs);
 652
 653         if (!rc && sfs.f_bfree < sfs.f_ffree) {
 654                 sfs.f_files = (sfs.f_files - sfs.f_ffree) + sfs.f_bfree;
 655                 sfs.f_ffree = sfs.f_bfree;
 656         }
 657
 658         statfs_pack(osfs, &sfs);
 659         return rc;
 660 }
 661
 662 static int fsfilt_ext3_sync(struct super_block *sb)
 663 {
 664         return ext3_force_commit(sb);
 665 }
 666
 667 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
 668 struct bpointers {
 669         unsigned long *blocks;
 670         int *created;
 671         unsigned long start;
 672         int num;
 673         int init_num;
 674         int create;
 675 };
 676
 677 static int ext3_ext_find_goal(struct inode *inode, struct ext3_ext_path *path,
 678                                 unsigned long block)
 679 {
 680         struct ext3_inode_info *ei = EXT3_I(inode);
 681         unsigned long bg_start;
 682         unsigned long colour;
 683         int depth;
 684
 685         if (path) {
 686                 struct ext3_extent *ex;
 687                 depth = path->p_depth;
 688
 689                 /* try to predict block placement */
 690                 if ((ex = path[depth].p_ext))
 691                         return ex->ee_start + (block - ex->ee_block);
 692
 693                 /* it looks index is empty
 694                  * try to find starting from index itself */
 695                 if (path[depth].p_bh)
 696                         return path[depth].p_bh->b_blocknr;
 697         }
 698
 699         /* OK. use inode's group */
 700         bg_start = (ei->i_block_group * EXT3_BLOCKS_PER_GROUP(inode->i_sb)) +
 701                 le32_to_cpu(EXT3_SB(inode->i_sb)->s_es->s_first_data_block);
 702         colour = (current->pid % 16) *
 703                         (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16);
 704         return bg_start + colour + block;
 705 }
 706
 707 static int ext3_ext_new_extent_cb(struct ext3_extents_tree *tree,
 708                                   struct ext3_ext_path *path,
 709                                   struct ext3_extent *newex, int exist)
 710 {
 711         struct inode *inode = tree->inode;
 712         struct bpointers *bp = tree->private;
 713         int count, err, goal;
 714         unsigned long pblock;
 715         unsigned long tgen;
 716         loff_t new_i_size;
 717         handle_t *handle;
 718         int i;
 719
 720         i = EXT_DEPTH(tree);
 721         EXT_ASSERT(i == path->p_depth);
 722         EXT_ASSERT(path[i].p_hdr);
 723
 724         if (exist) {
 725                 err = EXT_CONTINUE;
 726                 goto map;
 727         }
 728
 729         if (bp->create == 0) {
 730                 i = 0;
 731                 if (newex->ee_block < bp->start)
 732                         i = bp->start - newex->ee_block;
 733                 if (i >= newex->ee_len)
 734                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 735                                         i, newex->ee_len);
 736                 for (; i < newex->ee_len && bp->num; i++) {
 737                         *(bp->created) = 0;
 738                         bp->created++;
 739                         *(bp->blocks) = 0;
 740                         bp->blocks++;
 741                         bp->num--;
 742                         bp->start++;
 743                 }
 744
 745                 return EXT_CONTINUE;
 746         }
 747
 748         tgen = EXT_GENERATION(tree);
 749         count = ext3_ext_calc_credits_for_insert(tree, path);
 750         up_write(&EXT3_I(inode)->truncate_sem);
 751
 752         handle = ext3_journal_start(inode, count + EXT3_ALLOC_NEEDED + 1);
 753         if (IS_ERR(handle)) {
 754                 down_write(&EXT3_I(inode)->truncate_sem);
 755                 return PTR_ERR(handle);
 756         }
 757
 758         if (tgen != EXT_GENERATION(tree)) {
 759                 /* the tree has changed. so path can be invalid at moment */
 760                 ext3_journal_stop(handle, inode);
 761                 down_write(&EXT3_I(inode)->truncate_sem);
 762                 return EXT_REPEAT;
 763         }
 764
 765         down_write(&EXT3_I(inode)->truncate_sem);
 766         goal = ext3_ext_find_goal(inode, path, newex->ee_block);
 767         count = newex->ee_len;
 768         pblock = ext3_new_blocks(handle, inode, &count, goal, &err);
 769         if (!pblock)
 770                 goto out;
 771         EXT_ASSERT(count <= newex->ee_len);
 772
 773         /* insert new extent */
 774         newex->ee_start = pblock;
 775         newex->ee_len = count;
 776         err = ext3_ext_insert_extent(handle, tree, path, newex);
 777         if (err)
 778                 goto out;
 779
 780         /* correct on-disk inode size */
 781         if (newex->ee_len > 0) {
 782                 new_i_size = (loff_t) newex->ee_block + newex->ee_len;
 783                 new_i_size = new_i_size << inode->i_blkbits;
 784                 if (new_i_size > EXT3_I(inode)->i_disksize) {
 785                         EXT3_I(inode)->i_disksize = new_i_size;
 786                         err = ext3_mark_inode_dirty(handle, inode);
 787                 }
 788         }
 789
 790 out:
 791         ext3_journal_stop(handle, inode);
 792 map:
 793         if (err >= 0) {
 794                 /* map blocks */
 795                 if (bp->num == 0) {
 796                         CERROR("hmm. why do we find this extent?\n");
 797                         CERROR("initial space: %lu:%u\n",
 798                                 bp->start, bp->init_num);
 799                         CERROR("current extent: %u/%u/%u %d\n",
 800                                 newex->ee_block, newex->ee_len,
 801                                 newex->ee_start, exist);
 802                 }
 803                 i = 0;
 804                 if (newex->ee_block < bp->start)
 805                         i = bp->start - newex->ee_block;
 806                 if (i >= newex->ee_len)
 807                         CERROR("nothing to do?! i = %d, e_num = %u\n",
 808                                         i, newex->ee_len);
 809                 for (; i < newex->ee_len && bp->num; i++) {
 810                         *(bp->created) = (exist == 0 ? 1 : 0);
 811                         bp->created++;
 812                         *(bp->blocks) = newex->ee_start + i;
 813                         bp->blocks++;
 814                         bp->num--;
 815                 }
 816         }
 817         return err;
 818 }
 819
 820 int fsfilt_map_nblocks(struct inode *inode, unsigned long block,
 821                        unsigned long num, unsigned long *blocks,
 822                        int *created, int create)
 823 {
 824         struct ext3_extents_tree tree;
 825         struct bpointers bp;
 826         int err;
 827
 828         CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
 829                 block, block + num, (unsigned) inode->i_ino);
 830
 831         ext3_init_tree_desc(&tree, inode);
 832         tree.private = &bp;
 833         bp.blocks = blocks;
 834         bp.created = created;
 835         bp.start = block;
 836         bp.init_num = bp.num = num;
 837         bp.create = create;
 838
 839         down_write(&EXT3_I(inode)->truncate_sem);
 840         err = ext3_ext_walk_space(&tree, block, num, ext3_ext_new_extent_cb);
 841         ext3_ext_invalidate_cache(&tree);
 842         up_write(&EXT3_I(inode)->truncate_sem);
 843
 844         return err;
 845 }
 846
 847 int fsfilt_ext3_map_ext_inode_pages(struct inode *inode, struct page **page,
 848                                     int pages, unsigned long *blocks,
 849                                     int *created, int create)
 850 {
 851         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 852         int rc = 0, i = 0;
 853         struct page *fp = NULL;
 854         int clen = 0;
 855
 856         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
 857                 inode->i_ino, pages, (*page)->index);
 858
 859         /* pages are sorted already. so, we just have to find
 860          * contig. space and process them properly */
 861         while (i < pages) {
 862                 if (fp == NULL) {
 863                         /* start new extent */
 864                         fp = *page++;
 865                         clen = 1;
 866                         i++;
 867                         continue;
 868                 } else if (fp->index + clen == (*page)->index) {
 869                         /* continue the extent */
 870                         page++;
 871                         clen++;
 872                         i++;
 873                         continue;
 874                 }
 875
 876                 /* process found extent */
 877                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
 878                                         clen * blocks_per_page, blocks,
 879                                         created, create);
 880                 if (rc)
 881                         GOTO(cleanup, rc);
 882
 883                 /* look for next extent */
 884                 fp = NULL;
 885                 blocks += blocks_per_page * clen;
 886                 created += blocks_per_page * clen;
 887         }
 888
 889         if (fp)
 890                 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
 891                                         clen * blocks_per_page, blocks,
 892                                         created, create);
 893 cleanup:
 894         return rc;
 895 }
 896 #endif
 897
 898 extern int ext3_map_inode_page(struct inode *inode, struct page *page,
 899                                unsigned long *blocks, int *created, int create);
 900 int fsfilt_ext3_map_bm_inode_pages(struct inode *inode, struct page **page,
 901                                    int pages, unsigned long *blocks,
 902                                    int *created, int create)
 903 {
 904         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 905         unsigned long *b;
 906         int rc = 0, i, *cr;
 907
 908         for (i = 0, cr = created, b = blocks; i < pages; i++, page++) {
 909                 rc = ext3_map_inode_page(inode, *page, b, cr, create);
 910                 if (rc) {
 911                         CERROR("ino %lu, blk %lu cr %u create %d: rc %d\n",
 912                                inode->i_ino, *b, *cr, create, rc);
 913                         break;
 914                 }
 915
 916                 b += blocks_per_page;
 917                 cr += blocks_per_page;
 918         }
 919         return rc;
 920 }
 921
 922 int fsfilt_ext3_map_inode_pages(struct inode *inode, struct page **page,
 923                                 int pages, unsigned long *blocks,
 924                                 int *created, int create,
 925                                 struct semaphore *optional_sem)
 926 {
 927         int rc;
 928 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
 929         if (EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL) {
 930                 rc = fsfilt_ext3_map_ext_inode_pages(inode, page, pages,
 931                                                      blocks, created, create);
 932                 return rc;
 933         }
 934 #endif
 935         if (optional_sem != NULL)
 936                 down(optional_sem);
 937         rc = fsfilt_ext3_map_bm_inode_pages(inode, page, pages, blocks,
 938                                             created, create);
 939         if (optional_sem != NULL)
 940                 up(optional_sem);
 941
 942         return rc;
 943 }
 944
 945 extern int ext3_prep_san_write(struct inode *inode, long *blocks,
 946                                int nblocks, loff_t newsize);
 947 static int fsfilt_ext3_prep_san_write(struct inode *inode, long *blocks,
 948                                       int nblocks, loff_t newsize)
 949 {
 950         return ext3_prep_san_write(inode, blocks, nblocks, newsize);
 951 }
 952
 953 static int fsfilt_ext3_read_record(struct file * file, void *buf,
 954                                    int size, loff_t *offs)
 955 {
 956         struct inode *inode = file->f_dentry->d_inode;
 957         unsigned long block;
 958         struct buffer_head *bh;
 959         int err, blocksize, csize, boffs;
 960
 961         /* prevent reading after eof */
 962         lock_kernel();
 963         if (inode->i_size < *offs + size) {
 964                 size = inode->i_size - *offs;
 965                 unlock_kernel();
 966                 if (size < 0) {
 967                         CERROR("size %llu is too short for read %u@%llu\n",
 968                                inode->i_size, size, *offs);
 969                         return -EIO;
 970                 } else if (size == 0) {
 971                         return 0;
 972                 }
 973         } else {
 974                 unlock_kernel();
 975         }
 976
 977         blocksize = 1 << inode->i_blkbits;
 978
 979         while (size > 0) {
 980                 block = *offs >> inode->i_blkbits;
 981                 boffs = *offs & (blocksize - 1);
 982                 csize = min(blocksize - boffs, size);
 983                 bh = ext3_bread(NULL, inode, block, 0, &err);
 984                 if (!bh) {
 985                         CERROR("can't read block: %d\n", err);
 986                         return err;
 987                 }
 988
 989                 memcpy(buf, bh->b_data + boffs, csize);
 990                 brelse(bh);
 991
 992                 *offs += csize;
 993                 buf += csize;
 994                 size -= csize;
 995         }
 996         return 0;
 997 }
 998
 999 static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
1000                                     loff_t *offs, int force_sync)
1001 {
1002         struct buffer_head *bh = NULL;
1003         unsigned long block;
1004         struct inode *inode = file->f_dentry->d_inode;
1005         loff_t old_size = inode->i_size, offset = *offs;
1006         loff_t new_size = inode->i_size;
1007         journal_t *journal;
1008         handle_t *handle;
1009         int err, block_count = 0, blocksize, size, boffs;
1010
1011         /* Determine how many transaction credits are needed */
1012         blocksize = 1 << inode->i_blkbits;
1013         block_count = (*offs & (blocksize - 1)) + bufsize;
1014         block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
1015
1016         journal = EXT3_SB(inode->i_sb)->s_journal;
1017         lock_kernel();
1018         handle = journal_start(journal,
1019                                block_count * EXT3_DATA_TRANS_BLOCKS + 2);
1020         unlock_kernel();
1021         if (IS_ERR(handle)) {
1022                 CERROR("can't start transaction\n");
1023                 return PTR_ERR(handle);
1024         }
1025
1026         while (bufsize > 0) {
1027                 if (bh != NULL)
1028                         brelse(bh);
1029
1030                 block = offset >> inode->i_blkbits;
1031                 boffs = offset & (blocksize - 1);
1032                 size = min(blocksize - boffs, bufsize);
1033                 bh = ext3_bread(handle, inode, block, 1, &err);
1034                 if (!bh) {
1035                         CERROR("can't read/create block: %d\n", err);
1036                         goto out;
1037                 }
1038
1039                 err = ext3_journal_get_write_access(handle, bh);
1040                 if (err) {
1041                         CERROR("journal_get_write_access() returned error %d\n",
1042                                err);
1043                         goto out;
1044                 }
1045                 LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
1046                 memcpy(bh->b_data + boffs, buf, size);
1047                 err = ext3_journal_dirty_metadata(handle, bh);
1048                 if (err) {
1049                         CERROR("journal_dirty_metadata() returned error %d\n",
1050                                err);
1051                         goto out;
1052                 }
1053                 if (offset + size > new_size)
1054                         new_size = offset + size;
1055                 offset += size;
1056                 bufsize -= size;
1057                 buf += size;
1058         }
1059
1060         if (force_sync)
1061                 handle->h_sync = 1; /* recovery likes this */
1062 out:
1063         if (bh)
1064                 brelse(bh);
1065
1066         /* correct in-core and on-disk sizes */
1067         if (new_size > inode->i_size) {
1068                 lock_kernel();
1069                 if (new_size > inode->i_size)
1070                         inode->i_size = new_size;
1071                 if (inode->i_size > EXT3_I(inode)->i_disksize)
1072                         EXT3_I(inode)->i_disksize = inode->i_size;
1073                 if (inode->i_size > old_size)
1074                         mark_inode_dirty(inode);
1075                 unlock_kernel();
1076         }
1077
1078         lock_kernel();
1079         journal_stop(handle);
1080         unlock_kernel();
1081
1082         if (err == 0)
1083                 *offs = offset;
1084         return err;
1085 }
1086
1087 static int fsfilt_ext3_setup(struct obd_device *obd, struct super_block *sb)
1088 {
1089 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1090         struct mds_obd *mds = &obd->u.mds;
1091 #endif
1092 #if 0
1093         EXT3_SB(sb)->dx_lock = fsfilt_ext3_dx_lock;
1094         EXT3_SB(sb)->dx_unlock = fsfilt_ext3_dx_unlock;
1095 #endif
1096 #ifdef S_PDIROPS
1097         CWARN("Enabling PDIROPS\n");
1098         set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
1099         sb->s_flags |= S_PDIROPS;
1100 #endif
1101         /* setup mdsnum in underlying fs */
1102 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1103         if (mds->mds_lmv_obd) {
1104                 struct ext3_sb_info *sbi = EXT3_SB(sb);
1105                 struct ext3_super_block *es = sbi->s_es;
1106                 handle_t *handle;
1107                 int err;
1108
1109                 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_MDSNUM)) {
1110                         CWARN("%s: set mdsnum %d in ext3fs\n",
1111                                         obd->obd_name, mds->mds_num);
1112                         lock_kernel();
1113                         handle = journal_start(sbi->s_journal, 1);
1114                         unlock_kernel();
1115                         LASSERT(!IS_ERR(handle));
1116                         err = ext3_journal_get_write_access(handle, sbi->s_sbh);
1117                         LASSERT(err == 0);
1118                         EXT3_SET_INCOMPAT_FEATURE(sb,
1119                                                 EXT3_FEATURE_INCOMPAT_MDSNUM);
1120                         es->s_mdsnum = mds->mds_num;
1121                         err = ext3_journal_dirty_metadata(handle, sbi->s_sbh);
1122                         LASSERT(err == 0);
1123                         lock_kernel();
1124                         journal_stop(handle);
1125                         unlock_kernel();
1126                 } else {
1127                         CWARN("%s: mdsnum initialized to %u in ext3fs\n",
1128                                 obd->obd_name, es->s_mdsnum);
1129                 }
1130                 sbi->s_mdsnum = es->s_mdsnum;
1131         }
1132 #endif
1133         return 0;
1134 }
1135
1136 extern int ext3_add_dir_entry(struct dentry *dentry);
1137 extern int ext3_del_dir_entry(struct dentry *dentry);
1138
1139 static int fsfilt_ext3_add_dir_entry(struct obd_device *obd,
1140                                  struct dentry *parent,
1141                                  char *name, int namelen,
1142                                  unsigned long ino,
1143                                  unsigned long generation,
1144                                  unsigned mds)
1145 {
1146 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1147         struct dentry *dentry;
1148         int err;
1149         LASSERT(ino != 0);
1150         LASSERT(namelen != 0);
1151         dentry = ll_lookup_one_len(name, parent, namelen);
1152         if (IS_ERR(dentry)) {
1153                 CERROR("can't lookup %*s in %lu/%lu: %d\n", dentry->d_name.len,
1154                        dentry->d_name.name, dentry->d_inode->i_ino,
1155                        (unsigned long) dentry->d_inode->i_generation,
1156                        (int) PTR_ERR(dentry));
1157                 RETURN(PTR_ERR(dentry));
1158         }
1159         if (dentry->d_inode != NULL) {
1160                 CERROR("dentry %*s(0x%p) found\n", dentry->d_name.len,
1161                        dentry->d_name.name, dentry);
1162                 l_dput(dentry);
1163                 RETURN(-EEXIST);
1164         }
1165
1166         /* mds_reint_rename() may use this method to add dir entry
1167          * that points onto local inode. and we don't want to find
1168          * it cross-ref by subsequent lookups */
1169         d_drop(dentry);
1170
1171         dentry->d_flags |= DCACHE_CROSS_REF;
1172         dentry->d_inum = ino;
1173         dentry->d_mdsnum = mds;
1174         dentry->d_generation = generation;
1175         lock_kernel();
1176         err = ext3_add_dir_entry(dentry);
1177         unlock_kernel();
1178
1179         l_dput(dentry);
1180
1181         RETURN(err);
1182 #else
1183 #error "rebuild kernel and lustre with ext3-mds-num patch!"
1184         LASSERT(0);
1185 #endif
1186 }
1187
1188 static int fsfilt_ext3_del_dir_entry(struct obd_device *obd,
1189                                  struct dentry *dentry)
1190 {
1191 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1192         int err;
1193         lock_kernel();
1194         err = ext3_del_dir_entry(dentry);
1195         unlock_kernel();
1196         if (err == 0)
1197                 d_drop(dentry);
1198         return err;
1199 #else
1200 #error "rebuild kernel and lustre with ext3-mds-num patch!"
1201         LASSERT(0);
1202 #endif
1203 }
1204
1205 static int fsfilt_ext3_set_xattr(struct inode * inode, void *handle, char *name,
1206                                  void *buffer, int buffer_size)
1207 {
1208         int rc = 0;
1209
1210         lock_kernel();
1211
1212         rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
1213                                    name, buffer, buffer_size, 0);
1214         unlock_kernel();
1215         if (rc)
1216                 CERROR("set xattr %s from inode %lu: rc %d\n",
1217                        name,  inode->i_ino, rc);
1218         return rc;
1219 }
1220
1221 static int fsfilt_ext3_get_xattr(struct inode *inode, char *name,
1222                                  void *buffer, int buffer_size)
1223 {
1224         int rc = 0;
1225
1226         lock_kernel();
1227
1228         rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
1229                             name, buffer, buffer_size);
1230         unlock_kernel();
1231
1232         if (buffer == NULL)
1233                 return (rc == -ENODATA) ? 0 : rc;
1234         if (rc < 0) {
1235                 CDEBUG(D_INFO, "error getting EA %s from inode %lu: rc %d\n",
1236                        name,  inode->i_ino, rc);
1237                 memset(buffer, 0, buffer_size);
1238                 return (rc == -ENODATA) ? 0 : rc;
1239         }
1240
1241         return rc;
1242 }
1243
1244 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
1245    objects. Logs is number of logfiles to update */
1246 static int fsfilt_ext3_get_op_len(int op, struct fsfilt_objinfo *fso, int logs)
1247 {
1248         if ( !fso ) {
1249                 switch(op) {
1250                 case FSFILT_OP_CREATE:
1251                                  /* directory leaf, index & indirect & EA*/
1252                         return 4 + 3 * logs;
1253                 case FSFILT_OP_UNLINK:
1254                         return 3 * logs;
1255                 }
1256         } else {
1257                 int i;
1258                 int needed = 0;
1259                 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
1260                 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
1261                 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
1262                 for (i = 0; i < op; i++, fso++) {
1263                         int nblocks = fso->fso_bufcnt * blockpp;
1264                         int ndindirect = min(nblocks, addrpp + 1);
1265                         int nindir = nblocks + ndindirect + 1;
1266
1267                         needed += nindir;
1268                 }
1269                 return needed + 3 * logs;
1270         }
1271
1272         return 0;
1273 }
1274
1275
1276 #define EXTENTS_EA "write_extents"
1277 #define EXTENTS_EA_SIZE 64
1278
1279 int ext3_ext_in_ea_alloc_space(struct inode *, int, const char *, unsigned long, unsigned long);
1280 int ext3_ext_in_ea_remove_space(struct inode *, int, const char *, unsigned long, unsigned long);
1281 int ext3_ext_in_ea_get_extents(struct inode *, int, const char *, char **, int *);
1282 int ext3_ext_in_ea_get_extents_num(struct inode *, int, const char *, int *);
1283
1284 static int fsfilt_ext3_insert_extents_ea(struct inode *inode,
1285                                       unsigned long from,
1286                                       unsigned long num)
1287 {
1288         int rc = 0;
1289
1290         rc = ext3_ext_in_ea_alloc_space(inode, EXT3_XATTR_INDEX_TRUSTED,
1291                                         EXTENTS_EA, from, num);
1292         return rc;
1293 }
1294
1295 static int fsfilt_ext3_remove_extents_ea(struct inode *inode,
1296                                          unsigned long from,
1297                                          unsigned long num)
1298 {
1299         int rc = 0;
1300
1301         rc = ext3_ext_in_ea_remove_space(inode, EXT3_XATTR_INDEX_TRUSTED,
1302                                          EXTENTS_EA, from, num);
1303         return rc;
1304 }
1305
1306 extern int ext3_init_tree_in_ea(struct inode *inode, int name_index,
1307                                 const char *eaname, int size);
1308
1309 static int fsfilt_ext3_init_extents_ea(struct inode *inode)
1310 {
1311         int rc = 0;
1312
1313         rc = ext3_init_tree_in_ea(inode, EXT3_XATTR_INDEX_TRUSTED,
1314                                   EXTENTS_EA, 64);
1315         return rc;
1316 }
1317
1318 static int fsfilt_ext3_get_inode_write_extents(struct inode *inode,
1319                                          char **pbuf, int *size)
1320 {
1321         int rc = 0;
1322
1323         rc = ext3_ext_in_ea_get_extents(inode, EXT3_XATTR_INDEX_TRUSTED,
1324                                         EXTENTS_EA,  pbuf, size);
1325         return rc;
1326 }
1327
1328 static int fsfilt_ext3_get_write_extents_num(struct inode *inode, int *size)
1329 {
1330         int rc = 0;
1331
1332         rc = ext3_ext_in_ea_get_extents_num(inode, EXT3_XATTR_INDEX_TRUSTED,
1333                                             EXTENTS_EA, size);
1334         return rc;
1335 }
1336
1337 static struct fsfilt_operations fsfilt_ext3_ops = {
1338         .fs_type                = "ext3",
1339         .fs_owner               = THIS_MODULE,
1340         .fs_start               = fsfilt_ext3_start,
1341         .fs_brw_start           = fsfilt_ext3_brw_start,
1342         .fs_commit              = fsfilt_ext3_commit,
1343         .fs_commit_async        = fsfilt_ext3_commit_async,
1344         .fs_commit_wait         = fsfilt_ext3_commit_wait,
1345         .fs_setattr             = fsfilt_ext3_setattr,
1346         .fs_iocontrol           = fsfilt_ext3_iocontrol,
1347         .fs_set_md              = fsfilt_ext3_set_md,
1348         .fs_get_md              = fsfilt_ext3_get_md,
1349         .fs_readpage            = fsfilt_ext3_readpage,
1350         .fs_add_journal_cb      = fsfilt_ext3_add_journal_cb,
1351         .fs_statfs              = fsfilt_ext3_statfs,
1352         .fs_sync                = fsfilt_ext3_sync,
1353         .fs_map_inode_pages     = fsfilt_ext3_map_inode_pages,
1354         .fs_prep_san_write      = fsfilt_ext3_prep_san_write,
1355         .fs_write_record        = fsfilt_ext3_write_record,
1356         .fs_read_record         = fsfilt_ext3_read_record,
1357         .fs_setup               = fsfilt_ext3_setup,
1358         .fs_getpage             = fsfilt_ext3_getpage,
1359         .fs_send_bio            = fsfilt_ext3_send_bio,
1360         .fs_set_xattr           = fsfilt_ext3_set_xattr,
1361         .fs_get_xattr           = fsfilt_ext3_get_xattr,
1362         .fs_get_op_len          = fsfilt_ext3_get_op_len,
1363         .fs_add_dir_entry       = fsfilt_ext3_add_dir_entry,
1364         .fs_del_dir_entry       = fsfilt_ext3_del_dir_entry,
1365         .fs_init_extents_ea         = fsfilt_ext3_init_extents_ea,
1366         .fs_insert_extents_ea       = fsfilt_ext3_insert_extents_ea,
1367         .fs_remove_extents_ea       = fsfilt_ext3_remove_extents_ea,
1368         .fs_get_inode_write_extents = fsfilt_ext3_get_inode_write_extents,
1369         .fs_get_write_extents_num   = fsfilt_ext3_get_write_extents_num,
1370 };
1371
1372 static int __init fsfilt_ext3_init(void)
1373 {
1374         int rc;
1375
1376         fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
1377                                       sizeof(struct fsfilt_cb_data), 0,
1378                                       0, NULL, NULL);
1379         if (!fcb_cache) {
1380                 CERROR("error allocating fsfilt journal callback cache\n");
1381                 GOTO(out, rc = -ENOMEM);
1382         }
1383
1384         rc = fsfilt_register_ops(&fsfilt_ext3_ops);
1385
1386         if (rc)
1387                 kmem_cache_destroy(fcb_cache);
1388 out:
1389         return rc;
1390 }
1391
1392 static void __exit fsfilt_ext3_exit(void)
1393 {
1394         int rc;
1395
1396         fsfilt_unregister_ops(&fsfilt_ext3_ops);
1397         rc = kmem_cache_destroy(fcb_cache);
1398
1399         if (rc || atomic_read(&fcb_cache_count)) {
1400                 CERROR("can't free fsfilt callback cache: count %d, rc = %d\n",
1401                        atomic_read(&fcb_cache_count), rc);
1402         }
1403 }
1404
1405 module_init(fsfilt_ext3_init);
1406 module_exit(fsfilt_ext3_exit);
1407
1408 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1409 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
1410 MODULE_LICENSE("GPL");