fs/xfs/xfs_iomap.c

   1 /*
   2  * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include "xfs.h"
  34
  35 #include "xfs_fs.h"
  36 #include "xfs_inum.h"
  37 #include "xfs_log.h"
  38 #include "xfs_trans.h"
  39 #include "xfs_sb.h"
  40 #include "xfs_ag.h"
  41 #include "xfs_dir.h"
  42 #include "xfs_dir2.h"
  43 #include "xfs_alloc.h"
  44 #include "xfs_dmapi.h"
  45 #include "xfs_quota.h"
  46 #include "xfs_mount.h"
  47 #include "xfs_alloc_btree.h"
  48 #include "xfs_bmap_btree.h"
  49 #include "xfs_ialloc_btree.h"
  50 #include "xfs_btree.h"
  51 #include "xfs_ialloc.h"
  52 #include "xfs_attr_sf.h"
  53 #include "xfs_dir_sf.h"
  54 #include "xfs_dir2_sf.h"
  55 #include "xfs_dinode.h"
  56 #include "xfs_inode.h"
  57 #include "xfs_bmap.h"
  58 #include "xfs_bit.h"
  59 #include "xfs_rtalloc.h"
  60 #include "xfs_error.h"
  61 #include "xfs_itable.h"
  62 #include "xfs_rw.h"
  63 #include "xfs_acl.h"
  64 #include "xfs_cap.h"
  65 #include "xfs_mac.h"
  66 #include "xfs_attr.h"
  67 #include "xfs_buf_item.h"
  68 #include "xfs_trans_space.h"
  69 #include "xfs_utils.h"
  70 #include "xfs_iomap.h"
  71
  72 #if defined(XFS_RW_TRACE)
  73 void
  74 xfs_iomap_enter_trace(
  75         int             tag,
  76         xfs_iocore_t    *io,
  77         xfs_off_t       offset,
  78         ssize_t         count)
  79 {
  80         xfs_inode_t     *ip = XFS_IO_INODE(io);
  81
  82         if (!ip->i_rwtrace)
  83                 return;
  84
  85         ktrace_enter(ip->i_rwtrace,
  86                 (void *)((unsigned long)tag),
  87                 (void *)ip,
  88                 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
  89                 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
  90                 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
  91                 (void *)((unsigned long)(offset & 0xffffffff)),
  92                 (void *)((unsigned long)count),
  93                 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),
  94                 (void *)((unsigned long)(io->io_new_size & 0xffffffff)),
  95                 (void *)NULL,
  96                 (void *)NULL,
  97                 (void *)NULL,
  98                 (void *)NULL,
  99                 (void *)NULL,
 100                 (void *)NULL,
 101                 (void *)NULL);
 102 }
 103
 104 void
 105 xfs_iomap_map_trace(
 106         int             tag,
 107         xfs_iocore_t    *io,
 108         xfs_off_t       offset,
 109         ssize_t         count,
 110         xfs_iomap_t     *iomapp,
 111         xfs_bmbt_irec_t *imapp,
 112         int             flags)
 113 {
 114         xfs_inode_t     *ip = XFS_IO_INODE(io);
 115
 116         if (!ip->i_rwtrace)
 117                 return;
 118
 119         ktrace_enter(ip->i_rwtrace,
 120                 (void *)((unsigned long)tag),
 121                 (void *)ip,
 122                 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
 123                 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
 124                 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
 125                 (void *)((unsigned long)(offset & 0xffffffff)),
 126                 (void *)((unsigned long)count),
 127                 (void *)((unsigned long)flags),
 128                 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
 129                 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
 130                 (void *)((unsigned long)(iomapp->iomap_delta)),
 131                 (void *)((unsigned long)(iomapp->iomap_bsize)),
 132                 (void *)((unsigned long)(iomapp->iomap_bn)),
 133                 (void *)(__psint_t)(imapp->br_startoff),
 134                 (void *)((unsigned long)(imapp->br_blockcount)),
 135                 (void *)(__psint_t)(imapp->br_startblock));
 136 }
 137 #else
 138 #define xfs_iomap_enter_trace(tag, io, offset, count)
 139 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
 140 #endif
 141
 142 #define XFS_WRITEIO_ALIGN(mp,off)       (((off) >> mp->m_writeio_log) \
 143                                                 << mp->m_writeio_log)
 144 #define XFS_STRAT_WRITE_IMAPS   2
 145 #define XFS_WRITE_IMAPS         XFS_BMAP_MAX_NMAP
 146
 147 STATIC int
 148 xfs_imap_to_bmap(
 149         xfs_iocore_t    *io,
 150         xfs_off_t       offset,
 151         xfs_bmbt_irec_t *imap,
 152         xfs_iomap_t     *iomapp,
 153         int             imaps,                  /* Number of imap entries */
 154         int             iomaps,                 /* Number of iomap entries */
 155         int             flags)
 156 {
 157         xfs_mount_t     *mp;
 158         xfs_fsize_t     nisize;
 159         int             pbm;
 160         xfs_fsblock_t   start_block;
 161
 162         mp = io->io_mount;
 163         nisize = XFS_SIZE(mp, io);
 164         if (io->io_new_size > nisize)
 165                 nisize = io->io_new_size;
 166
 167         for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
 168                 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
 169                 iomapp->iomap_delta = offset - iomapp->iomap_offset;
 170                 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
 171                 iomapp->iomap_flags = flags;
 172
 173                 if (io->io_flags & XFS_IOCORE_RT) {
 174                         iomapp->iomap_flags |= IOMAP_REALTIME;
 175                         iomapp->iomap_target = mp->m_rtdev_targp;
 176                 } else {
 177                         iomapp->iomap_target = mp->m_ddev_targp;
 178                 }
 179                 start_block = imap->br_startblock;
 180                 if (start_block == HOLESTARTBLOCK) {
 181                         iomapp->iomap_bn = IOMAP_DADDR_NULL;
 182                         iomapp->iomap_flags |= IOMAP_HOLE;
 183                 } else if (start_block == DELAYSTARTBLOCK) {
 184                         iomapp->iomap_bn = IOMAP_DADDR_NULL;
 185                         iomapp->iomap_flags |= IOMAP_DELAY;
 186                 } else {
 187                         iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block);
 188                         if (ISUNWRITTEN(imap))
 189                                 iomapp->iomap_flags |= IOMAP_UNWRITTEN;
 190                 }
 191
 192                 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) {
 193                         iomapp->iomap_flags |= IOMAP_EOF;
 194                 }
 195
 196                 offset += iomapp->iomap_bsize - iomapp->iomap_delta;
 197         }
 198         return pbm;     /* Return the number filled */
 199 }
 200
 201 int
 202 xfs_iomap(
 203         xfs_iocore_t    *io,
 204         xfs_off_t       offset,
 205         ssize_t         count,
 206         int             flags,
 207         xfs_iomap_t     *iomapp,
 208         int             *niomaps)
 209 {
 210         xfs_mount_t     *mp = io->io_mount;
 211         xfs_fileoff_t   offset_fsb, end_fsb;
 212         int             error = 0;
 213         int             lockmode = 0;
 214         xfs_bmbt_irec_t imap;
 215         int             nimaps = 1;
 216         int             bmapi_flags = 0;
 217         int             iomap_flags = 0;
 218
 219         if (XFS_FORCED_SHUTDOWN(mp))
 220                 return XFS_ERROR(EIO);
 221
 222         switch (flags &
 223                 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE |
 224                  BMAPI_UNWRITTEN | BMAPI_DEVICE)) {
 225         case BMAPI_READ:
 226                 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);
 227                 lockmode = XFS_LCK_MAP_SHARED(mp, io);
 228                 bmapi_flags = XFS_BMAPI_ENTIRE;
 229                 if (flags & BMAPI_IGNSTATE)
 230                         bmapi_flags |= XFS_BMAPI_IGSTATE;
 231                 break;
 232         case BMAPI_WRITE:
 233                 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);
 234                 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;
 235                 bmapi_flags = 0;
 236                 XFS_ILOCK(mp, io, lockmode);
 237                 break;
 238         case BMAPI_ALLOCATE:
 239                 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);
 240                 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;
 241                 bmapi_flags = XFS_BMAPI_ENTIRE;
 242                 /* Attempt non-blocking lock */
 243                 if (flags & BMAPI_TRYLOCK) {
 244                         if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))
 245                                 return XFS_ERROR(EAGAIN);
 246                 } else {
 247                         XFS_ILOCK(mp, io, lockmode);
 248                 }
 249                 break;
 250         case BMAPI_UNWRITTEN:
 251                 goto phase2;
 252         case BMAPI_DEVICE:
 253                 lockmode = XFS_LCK_MAP_SHARED(mp, io);
 254                 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?
 255                         mp->m_rtdev_targp : mp->m_ddev_targp;
 256                 error = 0;
 257                 *niomaps = 1;
 258                 goto out;
 259         default:
 260                 BUG();
 261         }
 262
 263         ASSERT(offset <= mp->m_maxioffset);
 264         if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
 265                 count = mp->m_maxioffset - offset;
 266         end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
 267         offset_fsb = XFS_B_TO_FSBT(mp, offset);
 268
 269         error = XFS_BMAPI(mp, NULL, io, offset_fsb,
 270                         (xfs_filblks_t)(end_fsb - offset_fsb),
 271                         bmapi_flags,  NULL, 0, &imap,
 272                         &nimaps, NULL);
 273
 274         if (error)
 275                 goto out;
 276
 277 phase2:
 278         switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {
 279         case BMAPI_WRITE:
 280                 /* If we found an extent, return it */
 281                 if (nimaps && (imap.br_startblock != HOLESTARTBLOCK)) {
 282                         xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
 283                                         offset, count, iomapp, &imap, flags);
 284                         break;
 285                 }
 286
 287                 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
 288                         error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
 289                                         count, flags, &imap, &nimaps, nimaps);
 290                 } else {
 291                         error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
 292                                         flags, &imap, &nimaps);
 293                 }
 294                 if (!error) {
 295                         xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
 296                                         offset, count, iomapp, &imap, flags);
 297                 }
 298                 iomap_flags = IOMAP_NEW;
 299                 break;
 300         case BMAPI_ALLOCATE:
 301                 /* If we found an extent, return it */
 302                 XFS_IUNLOCK(mp, io, lockmode);
 303                 lockmode = 0;
 304
 305                 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
 306                         xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
 307                                         offset, count, iomapp, &imap, flags);
 308                         break;
 309                 }
 310
 311                 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, &imap, &nimaps);
 312                 break;
 313         case BMAPI_UNWRITTEN:
 314                 lockmode = 0;
 315                 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
 316                 nimaps = 0;
 317                 break;
 318         }
 319
 320         if (nimaps) {
 321                 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
 322                                             iomapp, nimaps, *niomaps, iomap_flags);
 323         } else if (niomaps) {
 324                 *niomaps = 0;
 325         }
 326
 327 out:
 328         if (lockmode)
 329                 XFS_IUNLOCK(mp, io, lockmode);
 330         return XFS_ERROR(error);
 331 }
 332
 333 STATIC int
 334 xfs_flush_space(
 335         xfs_inode_t     *ip,
 336         int             *fsynced,
 337         int             *ioflags)
 338 {
 339         switch (*fsynced) {
 340         case 0:
 341                 if (ip->i_delayed_blks) {
 342                         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 343                         xfs_flush_inode(ip);
 344                         xfs_ilock(ip, XFS_ILOCK_EXCL);
 345                         *fsynced = 1;
 346                 } else {
 347                         *ioflags |= BMAPI_SYNC;
 348                         *fsynced = 2;
 349                 }
 350                 return 0;
 351         case 1:
 352                 *fsynced = 2;
 353                 *ioflags |= BMAPI_SYNC;
 354                 return 0;
 355         case 2:
 356                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
 357                 xfs_flush_device(ip);
 358                 xfs_ilock(ip, XFS_ILOCK_EXCL);
 359                 *fsynced = 3;
 360                 return 0;
 361         }
 362         return 1;
 363 }
 364
 365 int
 366 xfs_iomap_write_direct(
 367         xfs_inode_t     *ip,
 368         loff_t          offset,
 369         size_t          count,
 370         int             flags,
 371         xfs_bmbt_irec_t *ret_imap,
 372         int             *nmaps,
 373         int             found)
 374 {
 375         xfs_mount_t     *mp = ip->i_mount;
 376         xfs_iocore_t    *io = &ip->i_iocore;
 377         xfs_fileoff_t   offset_fsb;
 378         xfs_fileoff_t   last_fsb;
 379         xfs_filblks_t   count_fsb;
 380         xfs_fsize_t     isize;
 381         xfs_fsblock_t   firstfsb;
 382         int             nimaps, maps;
 383         int             error;
 384         int             bmapi_flag;
 385         int             rt;
 386         xfs_trans_t     *tp;
 387         xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp;
 388         xfs_bmap_free_t free_list;
 389         int             aeof;
 390         xfs_filblks_t   datablocks;
 391         int             committed;
 392         int             numrtextents;
 393         uint            resblks;
 394
 395         /*
 396          * Make sure that the dquots are there. This doesn't hold
 397          * the ilock across a disk read.
 398          */
 399         error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
 400         if (error)
 401                 return XFS_ERROR(error);
 402
 403         maps = min(XFS_WRITE_IMAPS, *nmaps);
 404         nimaps = maps;
 405
 406         isize = ip->i_d.di_size;
 407         aeof = (offset + count) > isize;
 408
 409         if (io->io_new_size > isize)
 410                 isize = io->io_new_size;
 411
 412         offset_fsb = XFS_B_TO_FSBT(mp, offset);
 413         last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
 414         count_fsb = last_fsb - offset_fsb;
 415         if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
 416                 xfs_fileoff_t   map_last_fsb;
 417
 418                 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
 419
 420                 if (map_last_fsb < last_fsb) {
 421                         last_fsb = map_last_fsb;
 422                         count_fsb = last_fsb - offset_fsb;
 423                 }
 424                 ASSERT(count_fsb > 0);
 425         }
 426
 427         /*
 428          * determine if reserving space on
 429          * the data or realtime partition.
 430          */
 431         if ((rt = XFS_IS_REALTIME_INODE(ip))) {
 432                 int     sbrtextsize, iprtextsize;
 433
 434                 sbrtextsize = mp->m_sb.sb_rextsize;
 435                 iprtextsize =
 436                         ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize;
 437                 numrtextents = (count_fsb + iprtextsize - 1);
 438                 do_div(numrtextents, sbrtextsize);
 439                 datablocks = 0;
 440         } else {
 441                 datablocks = count_fsb;
 442                 numrtextents = 0;
 443         }
 444
 445         /*
 446          * allocate and setup the transaction
 447          */
 448         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 449         tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
 450
 451         resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks);
 452
 453         error = xfs_trans_reserve(tp, resblks,
 454                         XFS_WRITE_LOG_RES(mp), numrtextents,
 455                         XFS_TRANS_PERM_LOG_RES,
 456                         XFS_WRITE_LOG_COUNT);
 457
 458         /*
 459          * check for running out of space
 460          */
 461         if (error)
 462                 /*
 463                  * Free the transaction structure.
 464                  */
 465                 xfs_trans_cancel(tp, 0);
 466
 467         xfs_ilock(ip, XFS_ILOCK_EXCL);
 468
 469         if (error)
 470                 goto error_out; /* Don't return in above if .. trans ..,
 471                                         need lock to return */
 472
 473         if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) {
 474                 error = (EDQUOT);
 475                 goto error1;
 476         }
 477         nimaps = 1;
 478
 479         bmapi_flag = XFS_BMAPI_WRITE;
 480         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 481         xfs_trans_ihold(tp, ip);
 482
 483         if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
 484                 bmapi_flag |= XFS_BMAPI_PREALLOC;
 485
 486         /*
 487          * issue the bmapi() call to allocate the blocks
 488          */
 489         XFS_BMAP_INIT(&free_list, &firstfsb);
 490         imapp = &imap[0];
 491         error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
 492                 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list);
 493         if (error) {
 494                 goto error0;
 495         }
 496
 497         /*
 498          * complete the transaction
 499          */
 500
 501         error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
 502         if (error) {
 503                 goto error0;
 504         }
 505
 506         error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
 507         if (error) {
 508                 goto error_out;
 509         }
 510
 511         /* copy any maps to caller's array and return any error. */
 512         if (nimaps == 0) {
 513                 error = (ENOSPC);
 514                 goto error_out;
 515         }
 516
 517         *ret_imap = imap[0];
 518         *nmaps = 1;
 519         if ( !(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
 520                 cmn_err(CE_PANIC,"Access to block zero:  fs <%s> inode: %lld "
 521                         "start_block : %llx start_off : %llx blkcnt : %llx "
 522                         "extent-state : %x \n",
 523                         (ip->i_mount)->m_fsname,
 524                         (long long)ip->i_ino,
 525                         ret_imap->br_startblock, ret_imap->br_startoff,
 526                         ret_imap->br_blockcount,ret_imap->br_state);
 527         }
 528         return 0;
 529
 530  error0:        /* Cancel bmap, unlock inode, and cancel trans */
 531         xfs_bmap_cancel(&free_list);
 532
 533  error1:        /* Just cancel transaction */
 534         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
 535         *nmaps = 0;     /* nothing set-up here */
 536
 537 error_out:
 538         return XFS_ERROR(error);
 539 }
 540
 541 int
 542 xfs_iomap_write_delay(
 543         xfs_inode_t     *ip,
 544         loff_t          offset,
 545         size_t          count,
 546         int             ioflag,
 547         xfs_bmbt_irec_t *ret_imap,
 548         int             *nmaps)
 549 {
 550         xfs_mount_t     *mp = ip->i_mount;
 551         xfs_iocore_t    *io = &ip->i_iocore;
 552         xfs_fileoff_t   offset_fsb;
 553         xfs_fileoff_t   last_fsb;
 554         xfs_fsize_t     isize;
 555         xfs_fsblock_t   firstblock;
 556         int             nimaps;
 557         int             error;
 558         xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
 559         int             aeof;
 560         int             fsynced = 0;
 561
 562         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
 563
 564         /*
 565          * Make sure that the dquots are there. This doesn't hold
 566          * the ilock across a disk read.
 567          */
 568
 569         error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
 570         if (error)
 571                 return XFS_ERROR(error);
 572
 573 retry:
 574         isize = ip->i_d.di_size;
 575         if (io->io_new_size > isize) {
 576                 isize = io->io_new_size;
 577         }
 578
 579         aeof = 0;
 580         offset_fsb = XFS_B_TO_FSBT(mp, offset);
 581         last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
 582         /*
 583          * If the caller is doing a write at the end of the file,
 584          * then extend the allocation (and the buffer used for the write)
 585          * out to the file system's write iosize.  We clean up any extra
 586          * space left over when the file is closed in xfs_inactive().
 587          *
 588          * For sync writes, we are flushing delayed allocate space to
 589          * try to make additional space available for allocation near
 590          * the filesystem full boundary - preallocation hurts in that
 591          * situation, of course.
 592          */
 593         if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
 594                 xfs_off_t       aligned_offset;
 595                 xfs_filblks_t   count_fsb;
 596                 unsigned int    iosize;
 597                 xfs_fileoff_t   ioalign;
 598                 int             n;
 599                 xfs_fileoff_t   start_fsb;
 600
 601                 /*
 602                  * If there are any real blocks past eof, then don't
 603                  * do any speculative allocation.
 604                  */
 605                 start_fsb = XFS_B_TO_FSBT(mp,
 606                                         ((xfs_ufsize_t)(offset + count - 1)));
 607                 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
 608                 while (count_fsb > 0) {
 609                         nimaps = XFS_WRITE_IMAPS;
 610                         error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
 611                                         0, &firstblock, 0, imap, &nimaps, NULL);
 612                         if (error) {
 613                                 return error;
 614                         }
 615                         for (n = 0; n < nimaps; n++) {
 616                                 if ( !(io->io_flags & XFS_IOCORE_RT)  &&
 617                                         !imap[n].br_startblock) {
 618                                         cmn_err(CE_PANIC,"Access to block "
 619                                                 "zero:  fs <%s> inode: %lld "
 620                                                 "start_block : %llx start_off "
 621                                                 ": %llx blkcnt : %llx "
 622                                                 "extent-state : %x \n",
 623                                                 (ip->i_mount)->m_fsname,
 624                                                 (long long)ip->i_ino,
 625                                                 imap[n].br_startblock,
 626                                                 imap[n].br_startoff,
 627                                                 imap[n].br_blockcount,
 628                                                 imap[n].br_state);
 629                                 }
 630                                 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
 631                                     (imap[n].br_startblock != DELAYSTARTBLOCK)) {
 632                                         goto write_map;
 633                                 }
 634                                 start_fsb += imap[n].br_blockcount;
 635                                 count_fsb -= imap[n].br_blockcount;
 636                         }
 637                 }
 638                 iosize = mp->m_writeio_blocks;
 639                 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
 640                 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
 641                 last_fsb = ioalign + iosize;
 642                 aeof = 1;
 643         }
 644 write_map:
 645         nimaps = XFS_WRITE_IMAPS;
 646         firstblock = NULLFSBLOCK;
 647
 648         /*
 649          * If mounted with the "-o swalloc" option, roundup the allocation
 650          * request to a stripe width boundary if the file size is >=
 651          * stripe width and we are allocating past the allocation eof.
 652          */
 653         if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth
 654             && (mp->m_flags & XFS_MOUNT_SWALLOC)
 655             && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
 656                 int eof;
 657                 xfs_fileoff_t new_last_fsb;
 658
 659                 new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
 660                 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
 661                 if (error) {
 662                         return error;
 663                 }
 664                 if (eof) {
 665                         last_fsb = new_last_fsb;
 666                 }
 667         /*
 668          * Roundup the allocation request to a stripe unit (m_dalign) boundary
 669          * if the file size is >= stripe unit size, and we are allocating past
 670          * the allocation eof.
 671          */
 672         } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
 673                    (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
 674                 int eof;
 675                 xfs_fileoff_t new_last_fsb;
 676                 new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
 677                 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
 678                 if (error) {
 679                         return error;
 680                 }
 681                 if (eof) {
 682                         last_fsb = new_last_fsb;
 683                 }
 684         /*
 685          * Round up the allocation request to a real-time extent boundary
 686          * if the file is on the real-time subvolume.
 687          */
 688         } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
 689                 int eof;
 690                 xfs_fileoff_t new_last_fsb;
 691
 692                 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
 693                 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
 694                 if (error) {
 695                         return error;
 696                 }
 697                 if (eof)
 698                         last_fsb = new_last_fsb;
 699         }
 700         error = xfs_bmapi(NULL, ip, offset_fsb,
 701                           (xfs_filblks_t)(last_fsb - offset_fsb),
 702                           XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
 703                           XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
 704                           &nimaps, NULL);
 705         /*
 706          * This can be EDQUOT, if nimaps == 0
 707          */
 708         if (error && (error != ENOSPC)) {
 709                 return XFS_ERROR(error);
 710         }
 711         /*
 712          * If bmapi returned us nothing, and if we didn't get back EDQUOT,
 713          * then we must have run out of space.
 714          */
 715         if (nimaps == 0) {
 716                 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
 717                                         io, offset, count);
 718                 if (xfs_flush_space(ip, &fsynced, &ioflag))
 719                         return XFS_ERROR(ENOSPC);
 720
 721                 error = 0;
 722                 goto retry;
 723         }
 724
 725         *ret_imap = imap[0];
 726         *nmaps = 1;
 727         if ( !(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
 728                 cmn_err(CE_PANIC,"Access to block zero:  fs <%s> inode: %lld "
 729                         "start_block : %llx start_off : %llx blkcnt : %llx "
 730                         "extent-state : %x \n",
 731                         (ip->i_mount)->m_fsname,
 732                         (long long)ip->i_ino,
 733                         ret_imap->br_startblock, ret_imap->br_startoff,
 734                         ret_imap->br_blockcount,ret_imap->br_state);
 735         }
 736         return 0;
 737 }
 738
 739 /*
 740  * Pass in a delayed allocate extent, convert it to real extents;
 741  * return to the caller the extent we create which maps on top of
 742  * the originating callers request.
 743  *
 744  * Called without a lock on the inode.
 745  */
 746 int
 747 xfs_iomap_write_allocate(
 748         xfs_inode_t     *ip,
 749         xfs_bmbt_irec_t *map,
 750         int             *retmap)
 751 {
 752         xfs_mount_t     *mp = ip->i_mount;
 753         xfs_iocore_t    *io = &ip->i_iocore;
 754         xfs_fileoff_t   offset_fsb, last_block;
 755         xfs_fileoff_t   end_fsb, map_start_fsb;
 756         xfs_fsblock_t   first_block;
 757         xfs_bmap_free_t free_list;
 758         xfs_filblks_t   count_fsb;
 759         xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
 760         xfs_trans_t     *tp;
 761         int             i, nimaps, committed;
 762         int             error = 0;
 763         int             nres;
 764
 765         *retmap = 0;
 766
 767         /*
 768          * Make sure that the dquots are there.
 769          */
 770         if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
 771                 return XFS_ERROR(error);
 772
 773         offset_fsb = map->br_startoff;
 774         count_fsb = map->br_blockcount;
 775         map_start_fsb = offset_fsb;
 776
 777         XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
 778
 779         while (count_fsb != 0) {
 780                 /*
 781                  * Set up a transaction with which to allocate the
 782                  * backing store for the file.  Do allocations in a
 783                  * loop until we get some space in the range we are
 784                  * interested in.  The other space that might be allocated
 785                  * is in the delayed allocation extent on which we sit
 786                  * but before our buffer starts.
 787                  */
 788
 789                 nimaps = 0;
 790                 while (nimaps == 0) {
 791                         tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
 792                         nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
 793                         error = xfs_trans_reserve(tp, nres,
 794                                         XFS_WRITE_LOG_RES(mp),
 795                                         0, XFS_TRANS_PERM_LOG_RES,
 796                                         XFS_WRITE_LOG_COUNT);
 797                         if (error == ENOSPC) {
 798                                 error = xfs_trans_reserve(tp, 0,
 799                                                 XFS_WRITE_LOG_RES(mp),
 800                                                 0,
 801                                                 XFS_TRANS_PERM_LOG_RES,
 802                                                 XFS_WRITE_LOG_COUNT);
 803                         }
 804                         if (error) {
 805                                 xfs_trans_cancel(tp, 0);
 806                                 return XFS_ERROR(error);
 807                         }
 808                         xfs_ilock(ip, XFS_ILOCK_EXCL);
 809                         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 810                         xfs_trans_ihold(tp, ip);
 811
 812                         XFS_BMAP_INIT(&free_list, &first_block);
 813
 814                         nimaps = XFS_STRAT_WRITE_IMAPS;
 815                         /*
 816                          * Ensure we don't go beyond eof - it is possible
 817                          * the extents changed since we did the read call,
 818                          * we dropped the ilock in the interim.
 819                          */
 820
 821                         end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
 822                         xfs_bmap_last_offset(NULL, ip, &last_block,
 823                                 XFS_DATA_FORK);
 824                         last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
 825                         if ((map_start_fsb + count_fsb) > last_block) {
 826                                 count_fsb = last_block - map_start_fsb;
 827                                 if (count_fsb == 0) {
 828                                         error = EAGAIN;
 829                                         goto trans_cancel;
 830                                 }
 831                         }
 832
 833                         /* Go get the actual blocks */
 834                         error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
 835                                         XFS_BMAPI_WRITE, &first_block, 1,
 836                                         imap, &nimaps, &free_list);
 837                         if (error)
 838                                 goto trans_cancel;
 839
 840                         error = xfs_bmap_finish(&tp, &free_list,
 841                                         first_block, &committed);
 842                         if (error)
 843                                 goto trans_cancel;
 844
 845                         error = xfs_trans_commit(tp,
 846                                         XFS_TRANS_RELEASE_LOG_RES, NULL);
 847                         if (error)
 848                                 goto error0;
 849
 850                         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 851                 }
 852
 853                 /*
 854                  * See if we were able to allocate an extent that
 855                  * covers at least part of the callers request
 856                  */
 857
 858                 for (i = 0; i < nimaps; i++) {
 859                         if ( !(io->io_flags & XFS_IOCORE_RT)  &&
 860                                 !imap[i].br_startblock) {
 861                                 cmn_err(CE_PANIC,"Access to block zero:  "
 862                                         "fs <%s> inode: %lld "
 863                                         "start_block : %llx start_off : %llx "
 864                                         "blkcnt : %llx extent-state : %x \n",
 865                                         (ip->i_mount)->m_fsname,
 866                                         (long long)ip->i_ino,
 867                                         imap[i].br_startblock,
 868                                         imap[i].br_startoff,
 869                                         imap[i].br_blockcount,imap[i].br_state);
 870                         }
 871                         if ((map->br_startoff >= imap[i].br_startoff) &&
 872                             (map->br_startoff < (imap[i].br_startoff +
 873                                                  imap[i].br_blockcount))) {
 874                                 *map = imap[i];
 875                                 *retmap = 1;
 876                                 XFS_STATS_INC(xs_xstrat_quick);
 877                                 return 0;
 878                         }
 879                         count_fsb -= imap[i].br_blockcount;
 880                 }
 881
 882                 /* So far we have not mapped the requested part of the
 883                  * file, just surrounding data, try again.
 884                  */
 885                 nimaps--;
 886                 offset_fsb = imap[nimaps].br_startoff +
 887                              imap[nimaps].br_blockcount;
 888                 map_start_fsb = offset_fsb;
 889         }
 890
 891 trans_cancel:
 892         xfs_bmap_cancel(&free_list);
 893         xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
 894 error0:
 895         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 896         return XFS_ERROR(error);
 897 }
 898
 899 int
 900 xfs_iomap_write_unwritten(
 901         xfs_inode_t     *ip,
 902         loff_t          offset,
 903         size_t          count)
 904 {
 905         xfs_mount_t     *mp = ip->i_mount;
 906         xfs_iocore_t    *io = &ip->i_iocore;
 907         xfs_trans_t     *tp;
 908         xfs_fileoff_t   offset_fsb;
 909         xfs_filblks_t   count_fsb;
 910         xfs_filblks_t   numblks_fsb;
 911         xfs_bmbt_irec_t imap;
 912         int             committed;
 913         int             error;
 914         int             nres;
 915         int             nimaps;
 916         xfs_fsblock_t   firstfsb;
 917         xfs_bmap_free_t free_list;
 918
 919         xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
 920                                 &ip->i_iocore, offset, count);
 921
 922         offset_fsb = XFS_B_TO_FSBT(mp, offset);
 923         count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
 924         count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
 925
 926         do {
 927                 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
 928
 929                 /*
 930                  * set up a transaction to convert the range of extents
 931                  * from unwritten to real. Do allocations in a loop until
 932                  * we have covered the range passed in.
 933                  */
 934
 935                 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
 936                 error = xfs_trans_reserve(tp, nres,
 937                                 XFS_WRITE_LOG_RES(mp), 0,
 938                                 XFS_TRANS_PERM_LOG_RES,
 939                                 XFS_WRITE_LOG_COUNT);
 940                 if (error) {
 941                         xfs_trans_cancel(tp, 0);
 942                         goto error0;
 943                 }
 944
 945                 xfs_ilock(ip, XFS_ILOCK_EXCL);
 946                 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 947                 xfs_trans_ihold(tp, ip);
 948
 949                 /*
 950                  * Modify the unwritten extent state of the buffer.
 951                  */
 952                 XFS_BMAP_INIT(&free_list, &firstfsb);
 953                 nimaps = 1;
 954                 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
 955                                   XFS_BMAPI_WRITE, &firstfsb,
 956                                   1, &imap, &nimaps, &free_list);
 957                 if (error)
 958                         goto error_on_bmapi_transaction;
 959
 960                 error = xfs_bmap_finish(&(tp), &(free_list),
 961                                 firstfsb, &committed);
 962                 if (error)
 963                         goto error_on_bmapi_transaction;
 964
 965                 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
 966                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
 967                 if (error)
 968                         goto error0;
 969
 970                 if ( !(io->io_flags & XFS_IOCORE_RT)  && !imap.br_startblock) {
 971                         cmn_err(CE_PANIC,"Access to block zero:  fs <%s> "
 972                                 "inode: %lld start_block : %llx start_off : "
 973                                 "%llx blkcnt : %llx extent-state : %x \n",
 974                                 (ip->i_mount)->m_fsname,
 975                                 (long long)ip->i_ino,
 976                                 imap.br_startblock,imap.br_startoff,
 977                                 imap.br_blockcount,imap.br_state);
 978                 }
 979
 980                 if ((numblks_fsb = imap.br_blockcount) == 0) {
 981                         /*
 982                          * The numblks_fsb value should always get
 983                          * smaller, otherwise the loop is stuck.
 984                          */
 985                         ASSERT(imap.br_blockcount);
 986                         break;
 987                 }
 988                 offset_fsb += numblks_fsb;
 989                 count_fsb -= numblks_fsb;
 990         } while (count_fsb > 0);
 991
 992         return 0;
 993
 994 error_on_bmapi_transaction:
 995         xfs_bmap_cancel(&free_list);
 996         xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
 997         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 998 error0:
 999         return XFS_ERROR(error);
1000 }