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