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 /* XXX ugh */
  39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  40  #include <linux/ext3_xattr.h>
  41 #else
  42 /*
  43  * our build flags set -I$LINUX/fs and -I$LUSTRE so that ext3 and
  44  * ldiskfs work correctly
  45  */
  46  #include <ext3/xattr.h>
  47 #endif
  48 #include <linux/kp30.h>
  49 #include <linux/lustre_fsfilt.h>
  50 #include <linux/obd.h>
  51 #include <linux/obd_class.h>
  52
  53 static kmem_cache_t *fcb_cache;
  54 static atomic_t fcb_cache_count = ATOMIC_INIT(0);
  55
  56 struct fsfilt_cb_data {
  57         struct journal_callback cb_jcb; /* jbd private data - MUST BE FIRST */
  58         fsfilt_cb_t cb_func;            /* MDS/OBD completion function */
  59         struct obd_device *cb_obd;      /* MDS/OBD completion device */
  60         __u64 cb_last_rcvd;             /* MDS/OST last committed operation */
  61         void *cb_data;                  /* MDS/OST completion function data */
  62 };
  63
  64 #ifndef EXT3_XATTR_INDEX_TRUSTED        /* temporary until we hit l28 kernel */
  65 #define EXT3_XATTR_INDEX_TRUSTED        4
  66 #endif
  67 #define XATTR_LUSTRE_MDS_LOV_EA         "lov"
  68
  69 /*
  70  * We don't currently need any additional blocks for rmdir and
  71  * unlink transactions because we are storing the OST oa_id inside
  72  * the inode (which we will be changing anyways as part of this
  73  * transaction).
  74  */
  75 static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
  76                                int logs)
  77 {
  78         /* For updates to the last recieved file */
  79         int nblocks = EXT3_SINGLEDATA_TRANS_BLOCKS;
  80         journal_t *journal;
  81         void *handle;
  82
  83         if (current->journal_info) {
  84                 CDEBUG(D_INODE, "increasing refcount on %p\n",
  85                        current->journal_info);
  86                 goto journal_start;
  87         }
  88
  89         switch(op) {
  90         case FSFILT_OP_RMDIR:
  91         case FSFILT_OP_UNLINK:
  92                 /* delete one file + create/update logs for each stripe */
  93                 nblocks += EXT3_DELETE_TRANS_BLOCKS;
  94                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
  95                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
  96                 break;
  97         case FSFILT_OP_RENAME:
  98                 /* modify additional directory */
  99                 nblocks += EXT3_SINGLEDATA_TRANS_BLOCKS;
 100                 /* no break */
 101         case FSFILT_OP_SYMLINK:
 102                 /* additional block + block bitmap + GDT for long symlink */
 103                 nblocks += 3;
 104                 /* no break */
 105         case FSFILT_OP_CREATE:
 106                 /* create/update logs for each stripe */
 107                 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 108                             EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
 109                 /* no break */
 110         case FSFILT_OP_MKDIR:
 111         case FSFILT_OP_MKNOD:
 112                 /* modify one inode + block bitmap + GDT */
 113                 nblocks += 3;
 114                 /* no break */
 115         case FSFILT_OP_LINK:
 116                 /* modify parent directory */
 117                 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS +
 118                         EXT3_DATA_TRANS_BLOCKS;
 119                 break;
 120         case FSFILT_OP_SETATTR:
 121                 /* Setattr on inode */
 122                 nblocks += 1;
 123                 break;
 124         case FSFILT_OP_CANCEL_UNLINK:
 125                 /* blocks for log header bitmap update OR
 126                  * blocks for catalog header bitmap update + unlink of logs */
 127                 nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
 128                         EXT3_DELETE_TRANS_BLOCKS * logs;
 129                 break;
 130         default: CERROR("unknown transaction start op %d\n", op);
 131                  LBUG();
 132         }
 133
 134         LASSERT(current->journal_info == desc_private);
 135         journal = EXT3_SB(inode->i_sb)->s_journal;
 136         if (nblocks > journal->j_max_transaction_buffers) {
 137                 CERROR("too many credits %d for op %ux%u using %d instead\n",
 138                        nblocks, op, logs, journal->j_max_transaction_buffers);
 139                 nblocks = journal->j_max_transaction_buffers;
 140         }
 141
 142  journal_start:
 143         lock_kernel();
 144         handle = journal_start(EXT3_JOURNAL(inode), nblocks);
 145         unlock_kernel();
 146
 147         if (!IS_ERR(handle))
 148                 LASSERT(current->journal_info == handle);
 149         else
 150                 CERROR("error starting handle for op %u (%u credits): rc %ld\n",
 151                        op, nblocks, PTR_ERR(handle));
 152         return handle;
 153 }
 154
 155 /*
 156  * Calculate the number of buffer credits needed to write multiple pages in
 157  * a single ext3 transaction.  No, this shouldn't be here, but as yet ext3
 158  * doesn't have a nice API for calculating this sort of thing in advance.
 159  *
 160  * See comment above ext3_writepage_trans_blocks for details.  We assume
 161  * no data journaling is being done, but it does allow for all of the pages
 162  * being non-contiguous.  If we are guaranteed contiguous pages we could
 163  * reduce the number of (d)indirect blocks a lot.
 164  *
 165  * With N blocks per page and P pages, for each inode we have at most:
 166  * N*P indirect
 167  * min(N*P, blocksize/4 + 1) dindirect blocks
 168  * niocount tindirect
 169  *
 170  * For the entire filesystem, we have at most:
 171  * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
 172  * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
 173  * objcount inode blocks
 174  * 1 superblock
 175  * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
 176  *
 177  * 1 EXT3_DATA_TRANS_BLOCKS for the last_rcvd update.
 178  */
 179 static int fsfilt_ext3_credits_needed(int objcount, struct fsfilt_objinfo *fso,
 180                                       int niocount, struct niobuf_local *nb)
 181 {
 182         struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
 183         __u64 next_indir;
 184         const int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
 185         int nbitmaps = 0, ngdblocks;
 186         int needed = objcount + 1; /* inodes + superblock */
 187         int i, j;
 188
 189         for (i = 0, j = 0; i < objcount; i++, fso++) {
 190                 /* two or more dindirect blocks in case we cross boundary */
 191                 int ndind = (long)((nb[j + fso->fso_bufcnt - 1].offset -
 192                                     nb[j].offset) >>
 193                                    sb->s_blocksize_bits) /
 194                         (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb));
 195                 nbitmaps += min(fso->fso_bufcnt, ndind > 0 ? ndind : 2);
 196
 197                 /* leaf, indirect, tindirect blocks for first block */
 198                 nbitmaps += blockpp + 2;
 199
 200                 j += fso->fso_bufcnt;
 201         }
 202
 203         next_indir = nb[0].offset +
 204                 (EXT3_ADDR_PER_BLOCK(sb) << sb->s_blocksize_bits);
 205         for (i = 1; i < niocount; i++) {
 206                 if (nb[i].offset >= next_indir) {
 207                         nbitmaps++;     /* additional indirect */
 208                         next_indir = nb[i].offset +
 209                                 (EXT3_ADDR_PER_BLOCK(sb)<<sb->s_blocksize_bits);
 210                 } else if (nb[i].offset != nb[i - 1].offset + sb->s_blocksize) {
 211                         nbitmaps++;     /* additional indirect */
 212                 }
 213                 nbitmaps += blockpp;    /* each leaf in different group? */
 214         }
 215
 216         ngdblocks = nbitmaps;
 217         if (nbitmaps > EXT3_SB(sb)->s_groups_count)
 218                 nbitmaps = EXT3_SB(sb)->s_groups_count;
 219         if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
 220                 ngdblocks = EXT3_SB(sb)->s_gdb_count;
 221
 222         needed += nbitmaps + ngdblocks;
 223
 224         /* last_rcvd update */
 225         needed += EXT3_DATA_TRANS_BLOCKS;
 226
 227 #if defined(CONFIG_QUOTA) && !defined(__x86_64__) /* XXX */
 228         /* We assume that there will be 1 bit set in s_dquot.flags for each
 229          * quota file that is active.  This is at least true for now.
 230          */
 231         needed += hweight32(sb_any_quota_enabled(sb)) *
 232                 EXT3_SINGLEDATA_TRANS_BLOCKS;
 233 #endif
 234
 235         return needed;
 236 }
 237
 238 /* We have to start a huge journal transaction here to hold all of the
 239  * metadata for the pages being written here.  This is necessitated by
 240  * the fact that we do lots of prepare_write operations before we do
 241  * any of the matching commit_write operations, so even if we split
 242  * up to use "smaller" transactions none of them could complete until
 243  * all of them were opened.  By having a single journal transaction,
 244  * we eliminate duplicate reservations for common blocks like the
 245  * superblock and group descriptors or bitmaps.
 246  *
 247  * We will start the transaction here, but each prepare_write will
 248  * add a refcount to the transaction, and each commit_write will
 249  * remove a refcount.  The transaction will be closed when all of
 250  * the pages have been written.
 251  */
 252 static void *fsfilt_ext3_brw_start(int objcount, struct fsfilt_objinfo *fso,
 253                                    int niocount, struct niobuf_local *nb,
 254                                    void *desc_private, int logs)
 255 {
 256         journal_t *journal;
 257         handle_t *handle;
 258         int needed;
 259         ENTRY;
 260
 261         LASSERT(current->journal_info == desc_private);
 262         journal = EXT3_SB(fso->fso_dentry->d_inode->i_sb)->s_journal;
 263         needed = fsfilt_ext3_credits_needed(objcount, fso, niocount, nb);
 264
 265         /* The number of blocks we could _possibly_ dirty can very large.
 266          * We reduce our request if it is absurd (and we couldn't get that
 267          * many credits for a single handle anyways).
 268          *
 269          * At some point we have to limit the size of I/Os sent at one time,
 270          * increase the size of the journal, or we have to calculate the
 271          * actual journal requirements more carefully by checking all of
 272          * the blocks instead of being maximally pessimistic.  It remains to
 273          * be seen if this is a real problem or not.
 274          */
 275         if (needed > journal->j_max_transaction_buffers) {
 276                 CERROR("want too many journal credits (%d) using %d instead\n",
 277                        needed, journal->j_max_transaction_buffers);
 278                 needed = journal->j_max_transaction_buffers;
 279         }
 280
 281         lock_kernel();
 282         handle = journal_start(journal, needed);
 283         unlock_kernel();
 284         if (IS_ERR(handle)) {
 285                 CERROR("can't get handle for %d credits: rc = %ld\n", needed,
 286                        PTR_ERR(handle));
 287         } else {
 288                 LASSERT(handle->h_buffer_credits >= needed);
 289                 LASSERT(current->journal_info == handle);
 290         }
 291
 292         RETURN(handle);
 293 }
 294
 295 static int fsfilt_ext3_commit(struct inode *inode, void *h, int force_sync)
 296 {
 297         int rc;
 298         handle_t *handle = h;
 299
 300         LASSERT(current->journal_info == handle);
 301         if (force_sync)
 302                 handle->h_sync = 1; /* recovery likes this */
 303
 304         lock_kernel();
 305         rc = journal_stop(handle);
 306         unlock_kernel();
 307
 308         // LASSERT(current->journal_info == NULL);
 309         return rc;
 310 }
 311
 312 static int fsfilt_ext3_commit_async(struct inode *inode, void *h,
 313                                         void **wait_handle)
 314 {
 315         transaction_t *transaction;
 316         unsigned long tid, rtid;
 317         handle_t *handle = h;
 318         journal_t *journal;
 319         int rc;
 320
 321         LASSERT(current->journal_info == handle);
 322
 323         lock_kernel();
 324         transaction = handle->h_transaction;
 325         journal = transaction->t_journal;
 326         tid = transaction->t_tid;
 327         /* we don't want to be blocked */
 328         handle->h_sync = 0;
 329         rc = journal_stop(handle);
 330         if (rc) {
 331                 CERROR("error while stopping transaction: %d\n", rc);
 332                 unlock_kernel();
 333                 return rc;
 334         }
 335 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 336         rtid = log_start_commit(journal, transaction);
 337         if (rtid != tid)
 338                 CERROR("strange race: %lu != %lu\n",
 339                        (unsigned long) tid, (unsigned long) rtid);
 340 #else
 341         log_start_commit(journal, transaction->t_tid);
 342 #endif
 343         unlock_kernel();
 344
 345         *wait_handle = (void *) tid;
 346         CDEBUG(D_INODE, "commit async: %lu\n", (unsigned long) tid);
 347         return 0;
 348 }
 349
 350 static int fsfilt_ext3_commit_wait(struct inode *inode, void *h)
 351 {
 352         tid_t tid = (tid_t)(long)h;
 353
 354         CDEBUG(D_INODE, "commit wait: %lu\n", (unsigned long) tid);
 355         if (is_journal_aborted(EXT3_JOURNAL(inode)))
 356                 return -EIO;
 357
 358         log_wait_commit(EXT3_JOURNAL(inode), tid);
 359
 360         return 0;
 361 }
 362
 363 static int fsfilt_ext3_setattr(struct dentry *dentry, void *handle,
 364                                struct iattr *iattr, int do_trunc)
 365 {
 366         struct inode *inode = dentry->d_inode;
 367         int rc;
 368
 369         lock_kernel();
 370
 371         /* A _really_ horrible hack to avoid removing the data stored
 372          * in the block pointers; this is really the "small" stripe MD data.
 373          * We can avoid further hackery by virtue of the MDS file size being
 374          * zero all the time (which doesn't invoke block truncate at unlink
 375          * time), so we assert we never change the MDS file size from zero. */
 376         if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
 377                 /* ATTR_SIZE would invoke truncate: clear it */
 378                 iattr->ia_valid &= ~ATTR_SIZE;
 379                 EXT3_I(inode)->i_disksize = inode->i_size = iattr->ia_size;
 380
 381                 /* make sure _something_ gets set - so new inode
 382                  * goes to disk (probably won't work over XFS */
 383                 if (!(iattr->ia_valid & (ATTR_MODE | ATTR_MTIME | ATTR_CTIME))){
 384                         iattr->ia_valid |= ATTR_MODE;
 385                         iattr->ia_mode = inode->i_mode;
 386                 }
 387         }
 388
 389         /* Don't allow setattr to change file type */
 390         iattr->ia_mode = (inode->i_mode & S_IFMT)|(iattr->ia_mode & ~S_IFMT);
 391
 392         /* We set these flags on the client, but have already checked perms
 393          * so don't confuse inode_change_ok. */
 394         iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
 395
 396         if (inode->i_op->setattr) {
 397                 rc = inode->i_op->setattr(dentry, iattr);
 398         } else {
 399                 rc = inode_change_ok(inode, iattr);
 400                 if (!rc)
 401                         rc = inode_setattr(inode, iattr);
 402         }
 403
 404         unlock_kernel();
 405
 406         return rc;
 407 }
 408
 409 static int fsfilt_ext3_iocontrol(struct inode * inode, struct file *file,
 410                                  unsigned int cmd, unsigned long arg)
 411 {
 412         int rc = 0;
 413         ENTRY;
 414
 415         if (inode->i_fop->ioctl)
 416                 rc = inode->i_fop->ioctl(inode, file, cmd, arg);
 417         else
 418                 RETURN(-ENOTTY);
 419
 420         RETURN(rc);
 421 }
 422
 423 static int fsfilt_ext3_set_md(struct inode *inode, void *handle,
 424                               void *lmm, int lmm_size)
 425 {
 426         int rc;
 427
 428         /* keep this when we get rid of OLD_EA (too noisy during conversion) */
 429         if (EXT3_I(inode)->i_file_acl /* || large inode EA flag */)
 430                 CWARN("setting EA on %lu/%u again... interesting\n",
 431                        inode->i_ino, inode->i_generation);
 432
 433         lock_kernel();
 434         rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
 435                                    XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size, 0);
 436
 437         unlock_kernel();
 438
 439         if (rc)
 440                 CERROR("error adding MD data to inode %lu: rc = %d\n",
 441                        inode->i_ino, rc);
 442         return rc;
 443 }
 444
 445 /* Must be called with i_sem held */
 446 static int fsfilt_ext3_get_md(struct inode *inode, void *lmm, int lmm_size)
 447 {
 448         int rc;
 449
 450         LASSERT(down_trylock(&inode->i_sem) != 0);
 451         lock_kernel();
 452
 453         rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
 454                             XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size);
 455         unlock_kernel();
 456
 457         /* This gives us the MD size */
 458         if (lmm == NULL)
 459                 return (rc == -ENODATA) ? 0 : rc;
 460
 461         if (rc < 0) {
 462                 CDEBUG(D_INFO, "error getting EA %d/%s from inode %lu: rc %d\n",
 463                        EXT3_XATTR_INDEX_TRUSTED, XATTR_LUSTRE_MDS_LOV_EA,
 464                        inode->i_ino, rc);
 465                 memset(lmm, 0, lmm_size);
 466                 return (rc == -ENODATA) ? 0 : rc;
 467         }
 468
 469         return rc;
 470 }
 471
 472 static ssize_t fsfilt_ext3_readpage(struct file *file, char *buf, size_t count,
 473                                     loff_t *off)
 474 {
 475         struct inode *inode = file->f_dentry->d_inode;
 476         int rc = 0;
 477
 478         if (S_ISREG(inode->i_mode))
 479                 rc = file->f_op->read(file, buf, count, off);
 480         else {
 481                 const int blkbits = inode->i_sb->s_blocksize_bits;
 482                 const int blksize = inode->i_sb->s_blocksize;
 483
 484                 CDEBUG(D_EXT2, "reading "LPSZ" at dir %lu+%llu\n",
 485                        count, inode->i_ino, *off);
 486                 while (count > 0) {
 487                         struct buffer_head *bh;
 488
 489                         bh = NULL;
 490                         if (*off < inode->i_size) {
 491                                 int err = 0;
 492
 493                                 bh = ext3_bread(NULL, inode, *off >> blkbits,
 494                                                 0, &err);
 495
 496                                 CDEBUG(D_EXT2, "read %u@%llu\n", blksize, *off);
 497
 498                                 if (bh) {
 499                                         memcpy(buf, bh->b_data, blksize);
 500                                         brelse(bh);
 501                                 } else if (err) {
 502                                         /* XXX in theory we should just fake
 503                                          * this buffer and continue like ext3,
 504                                          * especially if this is a partial read
 505                                          */
 506                                         CERROR("error read dir %lu+%llu: %d\n",
 507                                                inode->i_ino, *off, err);
 508                                         RETURN(err);
 509                                 }
 510                         }
 511                         if (!bh) {
 512                                 struct ext3_dir_entry_2 *fake = (void *)buf;
 513
 514                                 CDEBUG(D_EXT2, "fake %u@%llu\n", blksize, *off);
 515                                 memset(fake, 0, sizeof(*fake));
 516                                 fake->rec_len = cpu_to_le32(blksize);
 517                         }
 518                         count -= blksize;
 519                         buf += blksize;
 520                         *off += blksize;
 521                         rc += blksize;
 522                 }
 523         }
 524
 525         return rc;
 526 }
 527
 528 static void fsfilt_ext3_cb_func(struct journal_callback *jcb, int error)
 529 {
 530         struct fsfilt_cb_data *fcb = (struct fsfilt_cb_data *)jcb;
 531
 532         fcb->cb_func(fcb->cb_obd, fcb->cb_last_rcvd, fcb->cb_data, error);
 533
 534         OBD_SLAB_FREE(fcb, fcb_cache, sizeof *fcb);
 535         atomic_dec(&fcb_cache_count);
 536 }
 537
 538 static int fsfilt_ext3_add_journal_cb(struct obd_device *obd, __u64 last_rcvd,
 539                                       void *handle, fsfilt_cb_t cb_func,
 540                                       void *cb_data)
 541 {
 542         struct fsfilt_cb_data *fcb;
 543
 544         OBD_SLAB_ALLOC(fcb, fcb_cache, GFP_NOFS, sizeof *fcb);
 545         if (fcb == NULL)
 546                 RETURN(-ENOMEM);
 547
 548         atomic_inc(&fcb_cache_count);
 549         fcb->cb_func = cb_func;
 550         fcb->cb_obd = obd;
 551         fcb->cb_last_rcvd = last_rcvd;
 552         fcb->cb_data = cb_data;
 553
 554         CDEBUG(D_EXT2, "set callback for last_rcvd: "LPD64"\n", last_rcvd);
 555         lock_kernel();
 556         journal_callback_set(handle, fsfilt_ext3_cb_func,
 557                              (struct journal_callback *)fcb);
 558         unlock_kernel();
 559
 560         return 0;
 561 }
 562
 563 /*
 564  * We need to hack the return value for the free inode counts because
 565  * the current EA code requires one filesystem block per inode with EAs,
 566  * so it is possible to run out of blocks before we run out of inodes.
 567  *
 568  * This can be removed when the ext3 EA code is fixed.
 569  */
 570 static int fsfilt_ext3_statfs(struct super_block *sb, struct obd_statfs *osfs)
 571 {
 572         struct kstatfs sfs;
 573         int rc;
 574
 575         memset(&sfs, 0, sizeof(sfs));
 576
 577         rc = sb->s_op->statfs(sb, &sfs);
 578
 579         if (!rc && sfs.f_bfree < sfs.f_ffree) {
 580                 sfs.f_files = (sfs.f_files - sfs.f_ffree) + sfs.f_bfree;
 581                 sfs.f_ffree = sfs.f_bfree;
 582         }
 583
 584         statfs_pack(osfs, &sfs);
 585         return rc;
 586 }
 587
 588 static int fsfilt_ext3_sync(struct super_block *sb)
 589 {
 590         return ext3_force_commit(sb);
 591 }
 592
 593 extern int ext3_map_inode_page(struct inode *inode, struct page *page,
 594                                unsigned long *blocks, int *created, int create);
 595 int fsfilt_ext3_map_inode_page(struct inode *inode, struct page *page,
 596                                unsigned long *blocks, int *created, int create)
 597 {
 598         return ext3_map_inode_page(inode, page, blocks, created, create);
 599 }
 600
 601 extern int ext3_prep_san_write(struct inode *inode, long *blocks,
 602                                int nblocks, loff_t newsize);
 603 static int fsfilt_ext3_prep_san_write(struct inode *inode, long *blocks,
 604                                       int nblocks, loff_t newsize)
 605 {
 606         return ext3_prep_san_write(inode, blocks, nblocks, newsize);
 607 }
 608
 609 static int fsfilt_ext3_read_record(struct file * file, void *buf,
 610                                    int size, loff_t *offs)
 611 {
 612         struct inode *inode = file->f_dentry->d_inode;
 613         unsigned long block;
 614         struct buffer_head *bh;
 615         int err, blocksize, csize, boffs;
 616
 617         /* prevent reading after eof */
 618         lock_kernel();
 619         if (inode->i_size < *offs + size) {
 620                 size = inode->i_size - *offs;
 621                 unlock_kernel();
 622                 if (size < 0) {
 623                         CERROR("size %llu is too short for read %u@%llu\n",
 624                                inode->i_size, size, *offs);
 625                         return -EIO;
 626                 } else if (size == 0) {
 627                         return 0;
 628                 }
 629         } else {
 630                 unlock_kernel();
 631         }
 632
 633         blocksize = 1 << inode->i_blkbits;
 634
 635         while (size > 0) {
 636                 block = *offs >> inode->i_blkbits;
 637                 boffs = *offs & (blocksize - 1);
 638                 csize = min(blocksize - boffs, size);
 639                 bh = ext3_bread(NULL, inode, block, 0, &err);
 640                 if (!bh) {
 641                         CERROR("can't read block: %d\n", err);
 642                         return err;
 643                 }
 644
 645                 memcpy(buf, bh->b_data + boffs, csize);
 646                 brelse(bh);
 647
 648                 *offs += csize;
 649                 buf += csize;
 650                 size -= csize;
 651         }
 652         return 0;
 653 }
 654
 655 static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
 656                                     loff_t *offs, int force_sync)
 657 {
 658         struct buffer_head *bh = NULL;
 659         unsigned long block;
 660         struct inode *inode = file->f_dentry->d_inode;
 661         loff_t old_size = inode->i_size, offset = *offs;
 662         loff_t new_size = inode->i_size;
 663         journal_t *journal;
 664         handle_t *handle;
 665         int err, block_count = 0, blocksize, size, boffs;
 666
 667         /* Determine how many transaction credits are needed */
 668         blocksize = 1 << inode->i_blkbits;
 669         block_count = (*offs & (blocksize - 1)) + bufsize;
 670         block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
 671
 672         journal = EXT3_SB(inode->i_sb)->s_journal;
 673         lock_kernel();
 674         handle = journal_start(journal,
 675                                block_count * EXT3_DATA_TRANS_BLOCKS + 2);
 676         unlock_kernel();
 677         if (IS_ERR(handle)) {
 678                 CERROR("can't start transaction\n");
 679                 return PTR_ERR(handle);
 680         }
 681
 682         while (bufsize > 0) {
 683                 if (bh != NULL)
 684                         brelse(bh);
 685
 686                 block = offset >> inode->i_blkbits;
 687                 boffs = offset & (blocksize - 1);
 688                 size = min(blocksize - boffs, bufsize);
 689                 bh = ext3_bread(handle, inode, block, 1, &err);
 690                 if (!bh) {
 691                         CERROR("can't read/create block: %d\n", err);
 692                         goto out;
 693                 }
 694
 695                 err = ext3_journal_get_write_access(handle, bh);
 696                 if (err) {
 697                         CERROR("journal_get_write_access() returned error %d\n",
 698                                err);
 699                         goto out;
 700                 }
 701                 LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
 702                 memcpy(bh->b_data + boffs, buf, size);
 703                 err = ext3_journal_dirty_metadata(handle, bh);
 704                 if (err) {
 705                         CERROR("journal_dirty_metadata() returned error %d\n",
 706                                err);
 707                         goto out;
 708                 }
 709                 if (offset + size > new_size)
 710                         new_size = offset + size;
 711                 offset += size;
 712                 bufsize -= size;
 713                 buf += size;
 714         }
 715
 716         if (force_sync)
 717                 handle->h_sync = 1; /* recovery likes this */
 718 out:
 719         if (bh)
 720                 brelse(bh);
 721
 722         /* correct in-core and on-disk sizes */
 723         if (new_size > inode->i_size) {
 724                 lock_kernel();
 725                 if (new_size > inode->i_size)
 726                         inode->i_size = new_size;
 727                 if (inode->i_size > EXT3_I(inode)->i_disksize)
 728                         EXT3_I(inode)->i_disksize = inode->i_size;
 729                 if (inode->i_size > old_size)
 730                         mark_inode_dirty(inode);
 731                 unlock_kernel();
 732         }
 733
 734         lock_kernel();
 735         journal_stop(handle);
 736         unlock_kernel();
 737
 738         if (err == 0)
 739                 *offs = offset;
 740         return err;
 741 }
 742
 743 static int fsfilt_ext3_setup(struct super_block *sb)
 744 {
 745 #if 0
 746         EXT3_SB(sb)->dx_lock = fsfilt_ext3_dx_lock;
 747         EXT3_SB(sb)->dx_unlock = fsfilt_ext3_dx_unlock;
 748 #endif
 749 #ifdef S_PDIROPS
 750         CWARN("Enabling PDIROPS\n");
 751         set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
 752         sb->s_flags |= S_PDIROPS;
 753 #endif
 754         return 0;
 755 }
 756
 757 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
 758    objects. Logs is number of logfiles to update */
 759 static int fsfilt_ext3_get_op_len(int op, struct fsfilt_objinfo *fso, int logs)
 760 {
 761         if ( !fso ) {
 762                 switch(op) {
 763                 case FSFILT_OP_CREATE:
 764                                  /* directory leaf, index & indirect & EA*/
 765                         return 4 + 3 * logs;
 766                 case FSFILT_OP_UNLINK:
 767                         return 3 * logs;
 768                 }
 769         } else {
 770                 int i;
 771                 int needed = 0;
 772                 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
 773                 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
 774                 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
 775                 for (i = 0; i < op; i++, fso++) {
 776                         int nblocks = fso->fso_bufcnt * blockpp;
 777                         int ndindirect = min(nblocks, addrpp + 1);
 778                         int nindir = nblocks + ndindirect + 1;
 779
 780                         needed += nindir;
 781                 }
 782                 return needed + 3 * logs;
 783         }
 784
 785         return 0;
 786 }
 787
 788 static struct fsfilt_operations fsfilt_ext3_ops = {
 789         fs_type:                "ext3",
 790         fs_owner:               THIS_MODULE,
 791         fs_start:               fsfilt_ext3_start,
 792         fs_brw_start:           fsfilt_ext3_brw_start,
 793         fs_commit:              fsfilt_ext3_commit,
 794         fs_commit_async:        fsfilt_ext3_commit_async,
 795         fs_commit_wait:         fsfilt_ext3_commit_wait,
 796         fs_setattr:             fsfilt_ext3_setattr,
 797         fs_iocontrol:           fsfilt_ext3_iocontrol,
 798         fs_set_md:              fsfilt_ext3_set_md,
 799         fs_get_md:              fsfilt_ext3_get_md,
 800         fs_readpage:            fsfilt_ext3_readpage,
 801         fs_add_journal_cb:      fsfilt_ext3_add_journal_cb,
 802         fs_statfs:              fsfilt_ext3_statfs,
 803         fs_sync:                fsfilt_ext3_sync,
 804         fs_map_inode_page:      fsfilt_ext3_map_inode_page,
 805         fs_prep_san_write:      fsfilt_ext3_prep_san_write,
 806         fs_write_record:        fsfilt_ext3_write_record,
 807         fs_read_record:         fsfilt_ext3_read_record,
 808         fs_setup:               fsfilt_ext3_setup,
 809         fs_get_op_len:          fsfilt_ext3_get_op_len,
 810 };
 811
 812 static int __init fsfilt_ext3_init(void)
 813 {
 814         int rc;
 815
 816         //rc = ext3_xattr_register();
 817         fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
 818                                       sizeof(struct fsfilt_cb_data), 0,
 819                                       0, NULL, NULL);
 820         if (!fcb_cache) {
 821                 CERROR("error allocating fsfilt journal callback cache\n");
 822                 GOTO(out, rc = -ENOMEM);
 823         }
 824
 825         rc = fsfilt_register_ops(&fsfilt_ext3_ops);
 826
 827         if (rc)
 828                 kmem_cache_destroy(fcb_cache);
 829 out:
 830         return rc;
 831 }
 832
 833 static void __exit fsfilt_ext3_exit(void)
 834 {
 835         int rc;
 836
 837         fsfilt_unregister_ops(&fsfilt_ext3_ops);
 838         rc = kmem_cache_destroy(fcb_cache);
 839
 840         if (rc || atomic_read(&fcb_cache_count)) {
 841                 CERROR("can't free fsfilt callback cache: count %d, rc = %d\n",
 842                        atomic_read(&fcb_cache_count), rc);
 843         }
 844
 845         //rc = ext3_xattr_unregister();
 846 }
 847
 848 module_init(fsfilt_ext3_init);
 849 module_exit(fsfilt_ext3_exit);
 850
 851 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 852 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
 853 MODULE_LICENSE("GPL");