1 /* 2 * Copyright (c) 2000-2006 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_bit.h" 21 #include "xfs_log.h" 22 #include "xfs_inum.h" 23 #include "xfs_trans.h" 24 #include "xfs_sb.h" 25 #include "xfs_ag.h" 26 #include "xfs_dir2.h" 27 #include "xfs_alloc.h" 28 #include "xfs_dmapi.h" 29 #include "xfs_quota.h" 30 #include "xfs_mount.h" 31 #include "xfs_bmap_btree.h" 32 #include "xfs_alloc_btree.h" 33 #include "xfs_ialloc_btree.h" 34 #include "xfs_dir2_sf.h" 35 #include "xfs_attr_sf.h" 36 #include "xfs_dinode.h" 37 #include "xfs_inode.h" 38 #include "xfs_ialloc.h" 39 #include "xfs_btree.h" 40 #include "xfs_bmap.h" 41 #include "xfs_rtalloc.h" 42 #include "xfs_error.h" 43 #include "xfs_itable.h" 44 #include "xfs_rw.h" 45 #include "xfs_acl.h" 46 #include "xfs_attr.h" 47 #include "xfs_buf_item.h" 48 #include "xfs_trans_space.h" 49 #include "xfs_utils.h" 50 #include "xfs_iomap.h" 51 52 #if defined(XFS_RW_TRACE) 53 void 54 xfs_iomap_enter_trace( 55 int tag, 56 xfs_iocore_t *io, 57 xfs_off_t offset, 58 ssize_t count) 59 { 60 xfs_inode_t *ip = XFS_IO_INODE(io); 61 62 if (!ip->i_rwtrace) 63 return; 64 65 ktrace_enter(ip->i_rwtrace, 66 (void *)((unsigned long)tag), 67 (void *)ip, 68 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 69 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 70 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 71 (void *)((unsigned long)(offset & 0xffffffff)), 72 (void *)((unsigned long)count), 73 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)), 74 (void *)((unsigned long)(io->io_new_size & 0xffffffff)), 75 (void *)((unsigned long)current_pid()), 76 (void *)NULL, 77 (void *)NULL, 78 (void *)NULL, 79 (void *)NULL, 80 (void *)NULL, 81 (void *)NULL); 82 } 83 84 void 85 xfs_iomap_map_trace( 86 int tag, 87 xfs_iocore_t *io, 88 xfs_off_t offset, 89 ssize_t count, 90 xfs_iomap_t *iomapp, 91 xfs_bmbt_irec_t *imapp, 92 int flags) 93 { 94 xfs_inode_t *ip = XFS_IO_INODE(io); 95 96 if (!ip->i_rwtrace) 97 return; 98 99 ktrace_enter(ip->i_rwtrace, 100 (void *)((unsigned long)tag), 101 (void *)ip, 102 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 103 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 104 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 105 (void *)((unsigned long)(offset & 0xffffffff)), 106 (void *)((unsigned long)count), 107 (void *)((unsigned long)flags), 108 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)), 109 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)), 110 (void *)((unsigned long)(iomapp->iomap_delta)), 111 (void *)((unsigned long)(iomapp->iomap_bsize)), 112 (void *)((unsigned long)(iomapp->iomap_bn)), 113 (void *)(__psint_t)(imapp->br_startoff), 114 (void *)((unsigned long)(imapp->br_blockcount)), 115 (void *)(__psint_t)(imapp->br_startblock)); 116 } 117 #else 118 #define xfs_iomap_enter_trace(tag, io, offset, count) 119 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags) 120 #endif 121 122 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ 123 << mp->m_writeio_log) 124 #define XFS_STRAT_WRITE_IMAPS 2 125 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP 126 127 STATIC int 128 xfs_imap_to_bmap( 129 xfs_iocore_t *io, 130 xfs_off_t offset, 131 xfs_bmbt_irec_t *imap, 132 xfs_iomap_t *iomapp, 133 int imaps, /* Number of imap entries */ 134 int iomaps, /* Number of iomap entries */ 135 int flags) 136 { 137 xfs_mount_t *mp; 138 xfs_fsize_t nisize; 139 int pbm; 140 xfs_fsblock_t start_block; 141 142 mp = io->io_mount; 143 nisize = XFS_SIZE(mp, io); 144 if (io->io_new_size > nisize) 145 nisize = io->io_new_size; 146 147 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) { 148 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff); 149 iomapp->iomap_delta = offset - iomapp->iomap_offset; 150 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount); 151 iomapp->iomap_flags = flags; 152 153 if (io->io_flags & XFS_IOCORE_RT) { 154 iomapp->iomap_flags |= IOMAP_REALTIME; 155 iomapp->iomap_target = mp->m_rtdev_targp; 156 } else { 157 iomapp->iomap_target = mp->m_ddev_targp; 158 } 159 start_block = imap->br_startblock; 160 if (start_block == HOLESTARTBLOCK) { 161 iomapp->iomap_bn = IOMAP_DADDR_NULL; 162 iomapp->iomap_flags |= IOMAP_HOLE; 163 } else if (start_block == DELAYSTARTBLOCK) { 164 iomapp->iomap_bn = IOMAP_DADDR_NULL; 165 iomapp->iomap_flags |= IOMAP_DELAY; 166 } else { 167 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block); 168 if (ISUNWRITTEN(imap)) 169 iomapp->iomap_flags |= IOMAP_UNWRITTEN; 170 } 171 172 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) { 173 iomapp->iomap_flags |= IOMAP_EOF; 174 } 175 176 offset += iomapp->iomap_bsize - iomapp->iomap_delta; 177 } 178 return pbm; /* Return the number filled */ 179 } 180 181 int 182 xfs_iomap( 183 xfs_iocore_t *io, 184 xfs_off_t offset, 185 ssize_t count, 186 int flags, 187 xfs_iomap_t *iomapp, 188 int *niomaps) 189 { 190 xfs_mount_t *mp = io->io_mount; 191 xfs_fileoff_t offset_fsb, end_fsb; 192 int error = 0; 193 int lockmode = 0; 194 xfs_bmbt_irec_t imap; 195 int nimaps = 1; 196 int bmapi_flags = 0; 197 int iomap_flags = 0; 198 199 if (XFS_FORCED_SHUTDOWN(mp)) 200 return XFS_ERROR(EIO); 201 202 switch (flags & 203 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE | 204 BMAPI_UNWRITTEN | BMAPI_DEVICE)) { 205 case BMAPI_READ: 206 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count); 207 lockmode = XFS_LCK_MAP_SHARED(mp, io); 208 bmapi_flags = XFS_BMAPI_ENTIRE; 209 break; 210 case BMAPI_WRITE: 211 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count); 212 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR; 213 if (flags & BMAPI_IGNSTATE) 214 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE; 215 XFS_ILOCK(mp, io, lockmode); 216 break; 217 case BMAPI_ALLOCATE: 218 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count); 219 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD; 220 bmapi_flags = XFS_BMAPI_ENTIRE; 221 /* Attempt non-blocking lock */ 222 if (flags & BMAPI_TRYLOCK) { 223 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode)) 224 return XFS_ERROR(EAGAIN); 225 } else { 226 XFS_ILOCK(mp, io, lockmode); 227 } 228 break; 229 case BMAPI_UNWRITTEN: 230 goto phase2; 231 case BMAPI_DEVICE: 232 lockmode = XFS_LCK_MAP_SHARED(mp, io); 233 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ? 234 mp->m_rtdev_targp : mp->m_ddev_targp; 235 error = 0; 236 *niomaps = 1; 237 goto out; 238 default: 239 BUG(); 240 } 241 242 ASSERT(offset <= mp->m_maxioffset); 243 if ((xfs_fsize_t)offset + count > mp->m_maxioffset) 244 count = mp->m_maxioffset - offset; 245 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 246 offset_fsb = XFS_B_TO_FSBT(mp, offset); 247 248 error = XFS_BMAPI(mp, NULL, io, offset_fsb, 249 (xfs_filblks_t)(end_fsb - offset_fsb), 250 bmapi_flags, NULL, 0, &imap, 251 &nimaps, NULL, NULL); 252 253 if (error) 254 goto out; 255 256 phase2: 257 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) { 258 case BMAPI_WRITE: 259 /* If we found an extent, return it */ 260 if (nimaps && 261 (imap.br_startblock != HOLESTARTBLOCK) && 262 (imap.br_startblock != DELAYSTARTBLOCK)) { 263 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 264 offset, count, iomapp, &imap, flags); 265 break; 266 } 267 268 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) { 269 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset, 270 count, flags, &imap, &nimaps, nimaps); 271 } else { 272 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, 273 flags, &imap, &nimaps); 274 } 275 if (!error) { 276 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io, 277 offset, count, iomapp, &imap, flags); 278 } 279 iomap_flags = IOMAP_NEW; 280 break; 281 case BMAPI_ALLOCATE: 282 /* If we found an extent, return it */ 283 XFS_IUNLOCK(mp, io, lockmode); 284 lockmode = 0; 285 286 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) { 287 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 288 offset, count, iomapp, &imap, flags); 289 break; 290 } 291 292 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, 293 &imap, &nimaps); 294 break; 295 case BMAPI_UNWRITTEN: 296 lockmode = 0; 297 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count); 298 nimaps = 0; 299 break; 300 } 301 302 if (nimaps) { 303 *niomaps = xfs_imap_to_bmap(io, offset, &imap, 304 iomapp, nimaps, *niomaps, iomap_flags); 305 } else if (niomaps) { 306 *niomaps = 0; 307 } 308 309 out: 310 if (lockmode) 311 XFS_IUNLOCK(mp, io, lockmode); 312 return XFS_ERROR(error); 313 } 314 315 STATIC int 316 xfs_iomap_eof_align_last_fsb( 317 xfs_mount_t *mp, 318 xfs_iocore_t *io, 319 xfs_fsize_t isize, 320 xfs_extlen_t extsize, 321 xfs_fileoff_t *last_fsb) 322 { 323 xfs_fileoff_t new_last_fsb = 0; 324 xfs_extlen_t align; 325 int eof, error; 326 327 if (io->io_flags & XFS_IOCORE_RT) 328 ; 329 /* 330 * If mounted with the "-o swalloc" option, roundup the allocation 331 * request to a stripe width boundary if the file size is >= 332 * stripe width and we are allocating past the allocation eof. 333 */ 334 else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && 335 (isize >= XFS_FSB_TO_B(mp, mp->m_swidth))) 336 new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); 337 /* 338 * Roundup the allocation request to a stripe unit (m_dalign) boundary 339 * if the file size is >= stripe unit size, and we are allocating past 340 * the allocation eof. 341 */ 342 else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign))) 343 new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); 344 345 /* 346 * Always round up the allocation request to an extent boundary 347 * (when file on a real-time subvolume or has di_extsize hint). 348 */ 349 if (extsize) { 350 if (new_last_fsb) 351 align = roundup_64(new_last_fsb, extsize); 352 else 353 align = extsize; 354 new_last_fsb = roundup_64(*last_fsb, align); 355 } 356 357 if (new_last_fsb) { 358 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof); 359 if (error) 360 return error; 361 if (eof) 362 *last_fsb = new_last_fsb; 363 } 364 return 0; 365 } 366 367 STATIC int 368 xfs_flush_space( 369 xfs_inode_t *ip, 370 int *fsynced, 371 int *ioflags) 372 { 373 switch (*fsynced) { 374 case 0: 375 if (ip->i_delayed_blks) { 376 xfs_iunlock(ip, XFS_ILOCK_EXCL); 377 xfs_flush_inode(ip); 378 xfs_ilock(ip, XFS_ILOCK_EXCL); 379 *fsynced = 1; 380 } else { 381 *ioflags |= BMAPI_SYNC; 382 *fsynced = 2; 383 } 384 return 0; 385 case 1: 386 *fsynced = 2; 387 *ioflags |= BMAPI_SYNC; 388 return 0; 389 case 2: 390 xfs_iunlock(ip, XFS_ILOCK_EXCL); 391 xfs_flush_device(ip); 392 xfs_ilock(ip, XFS_ILOCK_EXCL); 393 *fsynced = 3; 394 return 0; 395 } 396 return 1; 397 } 398 399 STATIC int 400 xfs_cmn_err_fsblock_zero( 401 xfs_inode_t *ip, 402 xfs_bmbt_irec_t *imap) 403 { 404 xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount, 405 "Access to block zero in inode %llu " 406 "start_block: %llx start_off: %llx " 407 "blkcnt: %llx extent-state: %x\n", 408 (unsigned long long)ip->i_ino, 409 (unsigned long long)imap->br_startblock, 410 (unsigned long long)imap->br_startoff, 411 (unsigned long long)imap->br_blockcount, 412 imap->br_state); 413 return EFSCORRUPTED; 414 } 415 416 int 417 xfs_iomap_write_direct( 418 xfs_inode_t *ip, 419 xfs_off_t offset, 420 size_t count, 421 int flags, 422 xfs_bmbt_irec_t *ret_imap, 423 int *nmaps, 424 int found) 425 { 426 xfs_mount_t *mp = ip->i_mount; 427 xfs_iocore_t *io = &ip->i_iocore; 428 xfs_fileoff_t offset_fsb; 429 xfs_fileoff_t last_fsb; 430 xfs_filblks_t count_fsb, resaligned; 431 xfs_fsblock_t firstfsb; 432 xfs_extlen_t extsz, temp; 433 xfs_fsize_t isize; 434 int nimaps; 435 int bmapi_flag; 436 int quota_flag; 437 int rt; 438 xfs_trans_t *tp; 439 xfs_bmbt_irec_t imap; 440 xfs_bmap_free_t free_list; 441 uint qblocks, resblks, resrtextents; 442 int committed; 443 int error; 444 445 /* 446 * Make sure that the dquots are there. This doesn't hold 447 * the ilock across a disk read. 448 */ 449 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED); 450 if (error) 451 return XFS_ERROR(error); 452 453 rt = XFS_IS_REALTIME_INODE(ip); 454 extsz = xfs_get_extsz_hint(ip); 455 456 isize = ip->i_size; 457 if (io->io_new_size > isize) 458 isize = io->io_new_size; 459 460 offset_fsb = XFS_B_TO_FSBT(mp, offset); 461 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 462 if ((offset + count) > isize) { 463 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz, 464 &last_fsb); 465 if (error) 466 goto error_out; 467 } else { 468 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) 469 last_fsb = MIN(last_fsb, (xfs_fileoff_t) 470 ret_imap->br_blockcount + 471 ret_imap->br_startoff); 472 } 473 count_fsb = last_fsb - offset_fsb; 474 ASSERT(count_fsb > 0); 475 476 resaligned = count_fsb; 477 if (unlikely(extsz)) { 478 if ((temp = do_mod(offset_fsb, extsz))) 479 resaligned += temp; 480 if ((temp = do_mod(resaligned, extsz))) 481 resaligned += extsz - temp; 482 } 483 484 if (unlikely(rt)) { 485 resrtextents = qblocks = resaligned; 486 resrtextents /= mp->m_sb.sb_rextsize; 487 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); 488 quota_flag = XFS_QMOPT_RES_RTBLKS; 489 } else { 490 resrtextents = 0; 491 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); 492 quota_flag = XFS_QMOPT_RES_REGBLKS; 493 } 494 495 /* 496 * Allocate and setup the transaction 497 */ 498 xfs_iunlock(ip, XFS_ILOCK_EXCL); 499 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 500 error = xfs_trans_reserve(tp, resblks, 501 XFS_WRITE_LOG_RES(mp), resrtextents, 502 XFS_TRANS_PERM_LOG_RES, 503 XFS_WRITE_LOG_COUNT); 504 /* 505 * Check for running out of space, note: need lock to return 506 */ 507 if (error) 508 xfs_trans_cancel(tp, 0); 509 xfs_ilock(ip, XFS_ILOCK_EXCL); 510 if (error) 511 goto error_out; 512 513 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, 514 qblocks, 0, quota_flag); 515 if (error) 516 goto error1; 517 518 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 519 xfs_trans_ihold(tp, ip); 520 521 bmapi_flag = XFS_BMAPI_WRITE; 522 if ((flags & BMAPI_DIRECT) && (offset < ip->i_size || extsz)) 523 bmapi_flag |= XFS_BMAPI_PREALLOC; 524 525 /* 526 * Issue the xfs_bmapi() call to allocate the blocks 527 */ 528 XFS_BMAP_INIT(&free_list, &firstfsb); 529 nimaps = 1; 530 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, bmapi_flag, 531 &firstfsb, 0, &imap, &nimaps, &free_list, NULL); 532 if (error) 533 goto error0; 534 535 /* 536 * Complete the transaction 537 */ 538 error = xfs_bmap_finish(&tp, &free_list, &committed); 539 if (error) 540 goto error0; 541 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); 542 if (error) 543 goto error_out; 544 545 /* 546 * Copy any maps to caller's array and return any error. 547 */ 548 if (nimaps == 0) { 549 error = ENOSPC; 550 goto error_out; 551 } 552 553 if (unlikely(!imap.br_startblock && !(io->io_flags & XFS_IOCORE_RT))) { 554 error = xfs_cmn_err_fsblock_zero(ip, &imap); 555 goto error_out; 556 } 557 558 *ret_imap = imap; 559 *nmaps = 1; 560 return 0; 561 562 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ 563 xfs_bmap_cancel(&free_list); 564 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag); 565 566 error1: /* Just cancel transaction */ 567 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 568 *nmaps = 0; /* nothing set-up here */ 569 570 error_out: 571 return XFS_ERROR(error); 572 } 573 574 /* 575 * If the caller is doing a write at the end of the file, 576 * then extend the allocation out to the file system's write 577 * iosize. We clean up any extra space left over when the 578 * file is closed in xfs_inactive(). 579 * 580 * For sync writes, we are flushing delayed allocate space to 581 * try to make additional space available for allocation near 582 * the filesystem full boundary - preallocation hurts in that 583 * situation, of course. 584 */ 585 STATIC int 586 xfs_iomap_eof_want_preallocate( 587 xfs_mount_t *mp, 588 xfs_iocore_t *io, 589 xfs_fsize_t isize, 590 xfs_off_t offset, 591 size_t count, 592 int ioflag, 593 xfs_bmbt_irec_t *imap, 594 int nimaps, 595 int *prealloc) 596 { 597 xfs_fileoff_t start_fsb; 598 xfs_filblks_t count_fsb; 599 xfs_fsblock_t firstblock; 600 int n, error, imaps; 601 602 *prealloc = 0; 603 if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize) 604 return 0; 605 606 /* 607 * If there are any real blocks past eof, then don't 608 * do any speculative allocation. 609 */ 610 start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); 611 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); 612 while (count_fsb > 0) { 613 imaps = nimaps; 614 firstblock = NULLFSBLOCK; 615 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 0, 616 &firstblock, 0, imap, &imaps, NULL, NULL); 617 if (error) 618 return error; 619 for (n = 0; n < imaps; n++) { 620 if ((imap[n].br_startblock != HOLESTARTBLOCK) && 621 (imap[n].br_startblock != DELAYSTARTBLOCK)) 622 return 0; 623 start_fsb += imap[n].br_blockcount; 624 count_fsb -= imap[n].br_blockcount; 625 } 626 } 627 *prealloc = 1; 628 return 0; 629 } 630 631 int 632 xfs_iomap_write_delay( 633 xfs_inode_t *ip, 634 xfs_off_t offset, 635 size_t count, 636 int ioflag, 637 xfs_bmbt_irec_t *ret_imap, 638 int *nmaps) 639 { 640 xfs_mount_t *mp = ip->i_mount; 641 xfs_iocore_t *io = &ip->i_iocore; 642 xfs_fileoff_t offset_fsb; 643 xfs_fileoff_t last_fsb; 644 xfs_off_t aligned_offset; 645 xfs_fileoff_t ioalign; 646 xfs_fsblock_t firstblock; 647 xfs_extlen_t extsz; 648 xfs_fsize_t isize; 649 int nimaps; 650 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; 651 int prealloc, fsynced = 0; 652 int error; 653 654 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); 655 656 /* 657 * Make sure that the dquots are there. This doesn't hold 658 * the ilock across a disk read. 659 */ 660 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); 661 if (error) 662 return XFS_ERROR(error); 663 664 extsz = xfs_get_extsz_hint(ip); 665 offset_fsb = XFS_B_TO_FSBT(mp, offset); 666 667 retry: 668 isize = ip->i_size; 669 if (io->io_new_size > isize) 670 isize = io->io_new_size; 671 672 error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count, 673 ioflag, imap, XFS_WRITE_IMAPS, &prealloc); 674 if (error) 675 return error; 676 677 if (prealloc) { 678 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); 679 ioalign = XFS_B_TO_FSBT(mp, aligned_offset); 680 last_fsb = ioalign + mp->m_writeio_blocks; 681 } else { 682 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 683 } 684 685 if (prealloc || extsz) { 686 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz, 687 &last_fsb); 688 if (error) 689 return error; 690 } 691 692 nimaps = XFS_WRITE_IMAPS; 693 firstblock = NULLFSBLOCK; 694 error = XFS_BMAPI(mp, NULL, io, offset_fsb, 695 (xfs_filblks_t)(last_fsb - offset_fsb), 696 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | 697 XFS_BMAPI_ENTIRE, &firstblock, 1, imap, 698 &nimaps, NULL, NULL); 699 if (error && (error != ENOSPC)) 700 return XFS_ERROR(error); 701 702 /* 703 * If bmapi returned us nothing, and if we didn't get back EDQUOT, 704 * then we must have run out of space - flush delalloc, and retry.. 705 */ 706 if (nimaps == 0) { 707 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, 708 io, offset, count); 709 if (xfs_flush_space(ip, &fsynced, &ioflag)) 710 return XFS_ERROR(ENOSPC); 711 712 error = 0; 713 goto retry; 714 } 715 716 if (unlikely(!imap[0].br_startblock && !(io->io_flags & XFS_IOCORE_RT))) 717 return xfs_cmn_err_fsblock_zero(ip, &imap[0]); 718 719 *ret_imap = imap[0]; 720 *nmaps = 1; 721 722 return 0; 723 } 724 725 /* 726 * Pass in a delayed allocate extent, convert it to real extents; 727 * return to the caller the extent we create which maps on top of 728 * the originating callers request. 729 * 730 * Called without a lock on the inode. 731 */ 732 int 733 xfs_iomap_write_allocate( 734 xfs_inode_t *ip, 735 xfs_off_t offset, 736 size_t count, 737 xfs_bmbt_irec_t *map, 738 int *retmap) 739 { 740 xfs_mount_t *mp = ip->i_mount; 741 xfs_iocore_t *io = &ip->i_iocore; 742 xfs_fileoff_t offset_fsb, last_block; 743 xfs_fileoff_t end_fsb, map_start_fsb; 744 xfs_fsblock_t first_block; 745 xfs_bmap_free_t free_list; 746 xfs_filblks_t count_fsb; 747 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; 748 xfs_trans_t *tp; 749 int i, nimaps, committed; 750 int error = 0; 751 int nres; 752 753 *retmap = 0; 754 755 /* 756 * Make sure that the dquots are there. 757 */ 758 if ((error = XFS_QM_DQATTACH(mp, ip, 0))) 759 return XFS_ERROR(error); 760 761 offset_fsb = XFS_B_TO_FSBT(mp, offset); 762 count_fsb = map->br_blockcount; 763 map_start_fsb = map->br_startoff; 764 765 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); 766 767 while (count_fsb != 0) { 768 /* 769 * Set up a transaction with which to allocate the 770 * backing store for the file. Do allocations in a 771 * loop until we get some space in the range we are 772 * interested in. The other space that might be allocated 773 * is in the delayed allocation extent on which we sit 774 * but before our buffer starts. 775 */ 776 777 nimaps = 0; 778 while (nimaps == 0) { 779 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 780 tp->t_flags |= XFS_TRANS_RESERVE; 781 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); 782 error = xfs_trans_reserve(tp, nres, 783 XFS_WRITE_LOG_RES(mp), 784 0, XFS_TRANS_PERM_LOG_RES, 785 XFS_WRITE_LOG_COUNT); 786 if (error) { 787 xfs_trans_cancel(tp, 0); 788 return XFS_ERROR(error); 789 } 790 xfs_ilock(ip, XFS_ILOCK_EXCL); 791 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 792 xfs_trans_ihold(tp, ip); 793 794 XFS_BMAP_INIT(&free_list, &first_block); 795 796 nimaps = XFS_STRAT_WRITE_IMAPS; 797 /* 798 * Ensure we don't go beyond eof - it is possible 799 * the extents changed since we did the read call, 800 * we dropped the ilock in the interim. 801 */ 802 803 end_fsb = XFS_B_TO_FSB(mp, ip->i_size); 804 xfs_bmap_last_offset(NULL, ip, &last_block, 805 XFS_DATA_FORK); 806 last_block = XFS_FILEOFF_MAX(last_block, end_fsb); 807 if ((map_start_fsb + count_fsb) > last_block) { 808 count_fsb = last_block - map_start_fsb; 809 if (count_fsb == 0) { 810 error = EAGAIN; 811 goto trans_cancel; 812 } 813 } 814 815 /* Go get the actual blocks */ 816 error = XFS_BMAPI(mp, tp, io, map_start_fsb, count_fsb, 817 XFS_BMAPI_WRITE, &first_block, 1, 818 imap, &nimaps, &free_list, NULL); 819 if (error) 820 goto trans_cancel; 821 822 error = xfs_bmap_finish(&tp, &free_list, &committed); 823 if (error) 824 goto trans_cancel; 825 826 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); 827 if (error) 828 goto error0; 829 830 xfs_iunlock(ip, XFS_ILOCK_EXCL); 831 } 832 833 /* 834 * See if we were able to allocate an extent that 835 * covers at least part of the callers request 836 */ 837 for (i = 0; i < nimaps; i++) { 838 if (unlikely(!imap[i].br_startblock && 839 !(io->io_flags & XFS_IOCORE_RT))) 840 return xfs_cmn_err_fsblock_zero(ip, &imap[i]); 841 if ((offset_fsb >= imap[i].br_startoff) && 842 (offset_fsb < (imap[i].br_startoff + 843 imap[i].br_blockcount))) { 844 *map = imap[i]; 845 *retmap = 1; 846 XFS_STATS_INC(xs_xstrat_quick); 847 return 0; 848 } 849 count_fsb -= imap[i].br_blockcount; 850 } 851 852 /* So far we have not mapped the requested part of the 853 * file, just surrounding data, try again. 854 */ 855 nimaps--; 856 map_start_fsb = imap[nimaps].br_startoff + 857 imap[nimaps].br_blockcount; 858 } 859 860 trans_cancel: 861 xfs_bmap_cancel(&free_list); 862 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 863 error0: 864 xfs_iunlock(ip, XFS_ILOCK_EXCL); 865 return XFS_ERROR(error); 866 } 867 868 int 869 xfs_iomap_write_unwritten( 870 xfs_inode_t *ip, 871 xfs_off_t offset, 872 size_t count) 873 { 874 xfs_mount_t *mp = ip->i_mount; 875 xfs_iocore_t *io = &ip->i_iocore; 876 xfs_fileoff_t offset_fsb; 877 xfs_filblks_t count_fsb; 878 xfs_filblks_t numblks_fsb; 879 xfs_fsblock_t firstfsb; 880 int nimaps; 881 xfs_trans_t *tp; 882 xfs_bmbt_irec_t imap; 883 xfs_bmap_free_t free_list; 884 uint resblks; 885 int committed; 886 int error; 887 888 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, 889 &ip->i_iocore, offset, count); 890 891 offset_fsb = XFS_B_TO_FSBT(mp, offset); 892 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 893 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); 894 895 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; 896 897 do { 898 /* 899 * set up a transaction to convert the range of extents 900 * from unwritten to real. Do allocations in a loop until 901 * we have covered the range passed in. 902 */ 903 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 904 tp->t_flags |= XFS_TRANS_RESERVE; 905 error = xfs_trans_reserve(tp, resblks, 906 XFS_WRITE_LOG_RES(mp), 0, 907 XFS_TRANS_PERM_LOG_RES, 908 XFS_WRITE_LOG_COUNT); 909 if (error) { 910 xfs_trans_cancel(tp, 0); 911 return XFS_ERROR(error); 912 } 913 914 xfs_ilock(ip, XFS_ILOCK_EXCL); 915 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 916 xfs_trans_ihold(tp, ip); 917 918 /* 919 * Modify the unwritten extent state of the buffer. 920 */ 921 XFS_BMAP_INIT(&free_list, &firstfsb); 922 nimaps = 1; 923 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, 924 XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb, 925 1, &imap, &nimaps, &free_list, NULL); 926 if (error) 927 goto error_on_bmapi_transaction; 928 929 error = xfs_bmap_finish(&(tp), &(free_list), &committed); 930 if (error) 931 goto error_on_bmapi_transaction; 932 933 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); 934 xfs_iunlock(ip, XFS_ILOCK_EXCL); 935 if (error) 936 return XFS_ERROR(error); 937 938 if (unlikely(!imap.br_startblock && 939 !(io->io_flags & XFS_IOCORE_RT))) 940 return xfs_cmn_err_fsblock_zero(ip, &imap); 941 942 if ((numblks_fsb = imap.br_blockcount) == 0) { 943 /* 944 * The numblks_fsb value should always get 945 * smaller, otherwise the loop is stuck. 946 */ 947 ASSERT(imap.br_blockcount); 948 break; 949 } 950 offset_fsb += numblks_fsb; 951 count_fsb -= numblks_fsb; 952 } while (count_fsb > 0); 953 954 return 0; 955 956 error_on_bmapi_transaction: 957 xfs_bmap_cancel(&free_list); 958 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); 959 xfs_iunlock(ip, XFS_ILOCK_EXCL); 960 return XFS_ERROR(error); 961 } 962