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_cap.h" 47 #include "xfs_mac.h" 48 #include "xfs_attr.h" 49 #include "xfs_buf_item.h" 50 #include "xfs_trans_space.h" 51 #include "xfs_utils.h" 52 #include "xfs_iomap.h" 53 54 #if defined(XFS_RW_TRACE) 55 void 56 xfs_iomap_enter_trace( 57 int tag, 58 xfs_iocore_t *io, 59 xfs_off_t offset, 60 ssize_t count) 61 { 62 xfs_inode_t *ip = XFS_IO_INODE(io); 63 64 if (!ip->i_rwtrace) 65 return; 66 67 ktrace_enter(ip->i_rwtrace, 68 (void *)((unsigned long)tag), 69 (void *)ip, 70 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 71 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 72 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 73 (void *)((unsigned long)(offset & 0xffffffff)), 74 (void *)((unsigned long)count), 75 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)), 76 (void *)((unsigned long)(io->io_new_size & 0xffffffff)), 77 (void *)((unsigned long)current_pid()), 78 (void *)NULL, 79 (void *)NULL, 80 (void *)NULL, 81 (void *)NULL, 82 (void *)NULL, 83 (void *)NULL); 84 } 85 86 void 87 xfs_iomap_map_trace( 88 int tag, 89 xfs_iocore_t *io, 90 xfs_off_t offset, 91 ssize_t count, 92 xfs_iomap_t *iomapp, 93 xfs_bmbt_irec_t *imapp, 94 int flags) 95 { 96 xfs_inode_t *ip = XFS_IO_INODE(io); 97 98 if (!ip->i_rwtrace) 99 return; 100 101 ktrace_enter(ip->i_rwtrace, 102 (void *)((unsigned long)tag), 103 (void *)ip, 104 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 105 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 106 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 107 (void *)((unsigned long)(offset & 0xffffffff)), 108 (void *)((unsigned long)count), 109 (void *)((unsigned long)flags), 110 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)), 111 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)), 112 (void *)((unsigned long)(iomapp->iomap_delta)), 113 (void *)((unsigned long)(iomapp->iomap_bsize)), 114 (void *)((unsigned long)(iomapp->iomap_bn)), 115 (void *)(__psint_t)(imapp->br_startoff), 116 (void *)((unsigned long)(imapp->br_blockcount)), 117 (void *)(__psint_t)(imapp->br_startblock)); 118 } 119 #else 120 #define xfs_iomap_enter_trace(tag, io, offset, count) 121 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags) 122 #endif 123 124 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ 125 << mp->m_writeio_log) 126 #define XFS_STRAT_WRITE_IMAPS 2 127 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP 128 129 STATIC int 130 xfs_imap_to_bmap( 131 xfs_iocore_t *io, 132 xfs_off_t offset, 133 xfs_bmbt_irec_t *imap, 134 xfs_iomap_t *iomapp, 135 int imaps, /* Number of imap entries */ 136 int iomaps, /* Number of iomap entries */ 137 int flags) 138 { 139 xfs_mount_t *mp; 140 xfs_fsize_t nisize; 141 int pbm; 142 xfs_fsblock_t start_block; 143 144 mp = io->io_mount; 145 nisize = XFS_SIZE(mp, io); 146 if (io->io_new_size > nisize) 147 nisize = io->io_new_size; 148 149 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) { 150 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff); 151 iomapp->iomap_delta = offset - iomapp->iomap_offset; 152 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount); 153 iomapp->iomap_flags = flags; 154 155 if (io->io_flags & XFS_IOCORE_RT) { 156 iomapp->iomap_flags |= IOMAP_REALTIME; 157 iomapp->iomap_target = mp->m_rtdev_targp; 158 } else { 159 iomapp->iomap_target = mp->m_ddev_targp; 160 } 161 start_block = imap->br_startblock; 162 if (start_block == HOLESTARTBLOCK) { 163 iomapp->iomap_bn = IOMAP_DADDR_NULL; 164 iomapp->iomap_flags |= IOMAP_HOLE; 165 } else if (start_block == DELAYSTARTBLOCK) { 166 iomapp->iomap_bn = IOMAP_DADDR_NULL; 167 iomapp->iomap_flags |= IOMAP_DELAY; 168 } else { 169 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block); 170 if (ISUNWRITTEN(imap)) 171 iomapp->iomap_flags |= IOMAP_UNWRITTEN; 172 } 173 174 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) { 175 iomapp->iomap_flags |= IOMAP_EOF; 176 } 177 178 offset += iomapp->iomap_bsize - iomapp->iomap_delta; 179 } 180 return pbm; /* Return the number filled */ 181 } 182 183 int 184 xfs_iomap( 185 xfs_iocore_t *io, 186 xfs_off_t offset, 187 ssize_t count, 188 int flags, 189 xfs_iomap_t *iomapp, 190 int *niomaps) 191 { 192 xfs_mount_t *mp = io->io_mount; 193 xfs_fileoff_t offset_fsb, end_fsb; 194 int error = 0; 195 int lockmode = 0; 196 xfs_bmbt_irec_t imap; 197 int nimaps = 1; 198 int bmapi_flags = 0; 199 int iomap_flags = 0; 200 201 if (XFS_FORCED_SHUTDOWN(mp)) 202 return XFS_ERROR(EIO); 203 204 switch (flags & 205 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE | 206 BMAPI_UNWRITTEN | BMAPI_DEVICE)) { 207 case BMAPI_READ: 208 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count); 209 lockmode = XFS_LCK_MAP_SHARED(mp, io); 210 bmapi_flags = XFS_BMAPI_ENTIRE; 211 break; 212 case BMAPI_WRITE: 213 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count); 214 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR; 215 if (flags & BMAPI_IGNSTATE) 216 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE; 217 XFS_ILOCK(mp, io, lockmode); 218 break; 219 case BMAPI_ALLOCATE: 220 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count); 221 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD; 222 bmapi_flags = XFS_BMAPI_ENTIRE; 223 /* Attempt non-blocking lock */ 224 if (flags & BMAPI_TRYLOCK) { 225 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode)) 226 return XFS_ERROR(EAGAIN); 227 } else { 228 XFS_ILOCK(mp, io, lockmode); 229 } 230 break; 231 case BMAPI_UNWRITTEN: 232 goto phase2; 233 case BMAPI_DEVICE: 234 lockmode = XFS_LCK_MAP_SHARED(mp, io); 235 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ? 236 mp->m_rtdev_targp : mp->m_ddev_targp; 237 error = 0; 238 *niomaps = 1; 239 goto out; 240 default: 241 BUG(); 242 } 243 244 ASSERT(offset <= mp->m_maxioffset); 245 if ((xfs_fsize_t)offset + count > mp->m_maxioffset) 246 count = mp->m_maxioffset - offset; 247 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 248 offset_fsb = XFS_B_TO_FSBT(mp, offset); 249 250 error = XFS_BMAPI(mp, NULL, io, offset_fsb, 251 (xfs_filblks_t)(end_fsb - offset_fsb), 252 bmapi_flags, NULL, 0, &imap, 253 &nimaps, NULL, NULL); 254 255 if (error) 256 goto out; 257 258 phase2: 259 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) { 260 case BMAPI_WRITE: 261 /* If we found an extent, return it */ 262 if (nimaps && 263 (imap.br_startblock != HOLESTARTBLOCK) && 264 (imap.br_startblock != DELAYSTARTBLOCK)) { 265 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 266 offset, count, iomapp, &imap, flags); 267 break; 268 } 269 270 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) { 271 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset, 272 count, flags, &imap, &nimaps, nimaps); 273 } else { 274 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, 275 flags, &imap, &nimaps); 276 } 277 if (!error) { 278 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io, 279 offset, count, iomapp, &imap, flags); 280 } 281 iomap_flags = IOMAP_NEW; 282 break; 283 case BMAPI_ALLOCATE: 284 /* If we found an extent, return it */ 285 XFS_IUNLOCK(mp, io, lockmode); 286 lockmode = 0; 287 288 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) { 289 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 290 offset, count, iomapp, &imap, flags); 291 break; 292 } 293 294 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, 295 &imap, &nimaps); 296 break; 297 case BMAPI_UNWRITTEN: 298 lockmode = 0; 299 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count); 300 nimaps = 0; 301 break; 302 } 303 304 if (nimaps) { 305 *niomaps = xfs_imap_to_bmap(io, offset, &imap, 306 iomapp, nimaps, *niomaps, iomap_flags); 307 } else if (niomaps) { 308 *niomaps = 0; 309 } 310 311 out: 312 if (lockmode) 313 XFS_IUNLOCK(mp, io, lockmode); 314 return XFS_ERROR(error); 315 } 316 317 STATIC int 318 xfs_iomap_eof_align_last_fsb( 319 xfs_mount_t *mp, 320 xfs_iocore_t *io, 321 xfs_fsize_t isize, 322 xfs_extlen_t extsize, 323 xfs_fileoff_t *last_fsb) 324 { 325 xfs_fileoff_t new_last_fsb = 0; 326 xfs_extlen_t align; 327 int eof, error; 328 329 if (io->io_flags & XFS_IOCORE_RT) 330 ; 331 /* 332 * If mounted with the "-o swalloc" option, roundup the allocation 333 * request to a stripe width boundary if the file size is >= 334 * stripe width and we are allocating past the allocation eof. 335 */ 336 else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && 337 (isize >= XFS_FSB_TO_B(mp, mp->m_swidth))) 338 new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); 339 /* 340 * Roundup the allocation request to a stripe unit (m_dalign) boundary 341 * if the file size is >= stripe unit size, and we are allocating past 342 * the allocation eof. 343 */ 344 else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign))) 345 new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); 346 347 /* 348 * Always round up the allocation request to an extent boundary 349 * (when file on a real-time subvolume or has di_extsize hint). 350 */ 351 if (extsize) { 352 if (new_last_fsb) 353 align = roundup_64(new_last_fsb, extsize); 354 else 355 align = extsize; 356 new_last_fsb = roundup_64(*last_fsb, align); 357 } 358 359 if (new_last_fsb) { 360 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof); 361 if (error) 362 return error; 363 if (eof) 364 *last_fsb = new_last_fsb; 365 } 366 return 0; 367 } 368 369 STATIC int 370 xfs_flush_space( 371 xfs_inode_t *ip, 372 int *fsynced, 373 int *ioflags) 374 { 375 switch (*fsynced) { 376 case 0: 377 if (ip->i_delayed_blks) { 378 xfs_iunlock(ip, XFS_ILOCK_EXCL); 379 xfs_flush_inode(ip); 380 xfs_ilock(ip, XFS_ILOCK_EXCL); 381 *fsynced = 1; 382 } else { 383 *ioflags |= BMAPI_SYNC; 384 *fsynced = 2; 385 } 386 return 0; 387 case 1: 388 *fsynced = 2; 389 *ioflags |= BMAPI_SYNC; 390 return 0; 391 case 2: 392 xfs_iunlock(ip, XFS_ILOCK_EXCL); 393 xfs_flush_device(ip); 394 xfs_ilock(ip, XFS_ILOCK_EXCL); 395 *fsynced = 3; 396 return 0; 397 } 398 return 1; 399 } 400 401 int 402 xfs_iomap_write_direct( 403 xfs_inode_t *ip, 404 xfs_off_t offset, 405 size_t count, 406 int flags, 407 xfs_bmbt_irec_t *ret_imap, 408 int *nmaps, 409 int found) 410 { 411 xfs_mount_t *mp = ip->i_mount; 412 xfs_iocore_t *io = &ip->i_iocore; 413 xfs_fileoff_t offset_fsb; 414 xfs_fileoff_t last_fsb; 415 xfs_filblks_t count_fsb, resaligned; 416 xfs_fsblock_t firstfsb; 417 xfs_extlen_t extsz, temp; 418 xfs_fsize_t isize; 419 int nimaps; 420 int bmapi_flag; 421 int quota_flag; 422 int rt; 423 xfs_trans_t *tp; 424 xfs_bmbt_irec_t imap; 425 xfs_bmap_free_t free_list; 426 uint qblocks, resblks, resrtextents; 427 int committed; 428 int error; 429 430 /* 431 * Make sure that the dquots are there. This doesn't hold 432 * the ilock across a disk read. 433 */ 434 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED); 435 if (error) 436 return XFS_ERROR(error); 437 438 rt = XFS_IS_REALTIME_INODE(ip); 439 if (unlikely(rt)) { 440 if (!(extsz = ip->i_d.di_extsize)) 441 extsz = mp->m_sb.sb_rextsize; 442 } else { 443 extsz = ip->i_d.di_extsize; 444 } 445 446 isize = ip->i_d.di_size; 447 if (io->io_new_size > isize) 448 isize = io->io_new_size; 449 450 offset_fsb = XFS_B_TO_FSBT(mp, offset); 451 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 452 if ((offset + count) > isize) { 453 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz, 454 &last_fsb); 455 if (error) 456 goto error_out; 457 } else { 458 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) 459 last_fsb = MIN(last_fsb, (xfs_fileoff_t) 460 ret_imap->br_blockcount + 461 ret_imap->br_startoff); 462 } 463 count_fsb = last_fsb - offset_fsb; 464 ASSERT(count_fsb > 0); 465 466 resaligned = count_fsb; 467 if (unlikely(extsz)) { 468 if ((temp = do_mod(offset_fsb, extsz))) 469 resaligned += temp; 470 if ((temp = do_mod(resaligned, extsz))) 471 resaligned += extsz - temp; 472 } 473 474 if (unlikely(rt)) { 475 resrtextents = qblocks = resaligned; 476 resrtextents /= mp->m_sb.sb_rextsize; 477 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); 478 quota_flag = XFS_QMOPT_RES_RTBLKS; 479 } else { 480 resrtextents = 0; 481 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); 482 quota_flag = XFS_QMOPT_RES_REGBLKS; 483 } 484 485 /* 486 * Allocate and setup the transaction 487 */ 488 xfs_iunlock(ip, XFS_ILOCK_EXCL); 489 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 490 error = xfs_trans_reserve(tp, resblks, 491 XFS_WRITE_LOG_RES(mp), resrtextents, 492 XFS_TRANS_PERM_LOG_RES, 493 XFS_WRITE_LOG_COUNT); 494 /* 495 * Check for running out of space, note: need lock to return 496 */ 497 if (error) 498 xfs_trans_cancel(tp, 0); 499 xfs_ilock(ip, XFS_ILOCK_EXCL); 500 if (error) 501 goto error_out; 502 503 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, 504 qblocks, 0, quota_flag); 505 if (error) 506 goto error1; 507 508 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 509 xfs_trans_ihold(tp, ip); 510 511 bmapi_flag = XFS_BMAPI_WRITE; 512 if ((flags & BMAPI_DIRECT) && (offset < ip->i_d.di_size || extsz)) 513 bmapi_flag |= XFS_BMAPI_PREALLOC; 514 515 /* 516 * Issue the xfs_bmapi() call to allocate the blocks 517 */ 518 XFS_BMAP_INIT(&free_list, &firstfsb); 519 nimaps = 1; 520 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, bmapi_flag, 521 &firstfsb, 0, &imap, &nimaps, &free_list, NULL); 522 if (error) 523 goto error0; 524 525 /* 526 * Complete the transaction 527 */ 528 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); 529 if (error) 530 goto error0; 531 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 532 if (error) 533 goto error_out; 534 535 /* 536 * Copy any maps to caller's array and return any error. 537 */ 538 if (nimaps == 0) { 539 error = (ENOSPC); 540 goto error_out; 541 } 542 543 *ret_imap = imap; 544 *nmaps = 1; 545 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 546 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 547 "start_block : %llx start_off : %llx blkcnt : %llx " 548 "extent-state : %x \n", 549 (ip->i_mount)->m_fsname, 550 (long long)ip->i_ino, 551 (unsigned long long)ret_imap->br_startblock, 552 (unsigned long long)ret_imap->br_startoff, 553 (unsigned long long)ret_imap->br_blockcount, 554 ret_imap->br_state); 555 } 556 return 0; 557 558 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ 559 xfs_bmap_cancel(&free_list); 560 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag); 561 562 error1: /* Just cancel transaction */ 563 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 564 *nmaps = 0; /* nothing set-up here */ 565 566 error_out: 567 return XFS_ERROR(error); 568 } 569 570 /* 571 * If the caller is doing a write at the end of the file, 572 * then extend the allocation out to the file system's write 573 * iosize. We clean up any extra space left over when the 574 * file is closed in xfs_inactive(). 575 * 576 * For sync writes, we are flushing delayed allocate space to 577 * try to make additional space available for allocation near 578 * the filesystem full boundary - preallocation hurts in that 579 * situation, of course. 580 */ 581 STATIC int 582 xfs_iomap_eof_want_preallocate( 583 xfs_mount_t *mp, 584 xfs_iocore_t *io, 585 xfs_fsize_t isize, 586 xfs_off_t offset, 587 size_t count, 588 int ioflag, 589 xfs_bmbt_irec_t *imap, 590 int nimaps, 591 int *prealloc) 592 { 593 xfs_fileoff_t start_fsb; 594 xfs_filblks_t count_fsb; 595 xfs_fsblock_t firstblock; 596 int n, error, imaps; 597 598 *prealloc = 0; 599 if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize) 600 return 0; 601 602 /* 603 * If there are any real blocks past eof, then don't 604 * do any speculative allocation. 605 */ 606 start_fsb = XFS_B_TO_FSBT(mp, ((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 imaps = nimaps; 610 firstblock = NULLFSBLOCK; 611 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 0, 612 &firstblock, 0, imap, &imaps, NULL, NULL); 613 if (error) 614 return error; 615 for (n = 0; n < imaps; n++) { 616 if ((imap[n].br_startblock != HOLESTARTBLOCK) && 617 (imap[n].br_startblock != DELAYSTARTBLOCK)) 618 return 0; 619 start_fsb += imap[n].br_blockcount; 620 count_fsb -= imap[n].br_blockcount; 621 } 622 } 623 *prealloc = 1; 624 return 0; 625 } 626 627 int 628 xfs_iomap_write_delay( 629 xfs_inode_t *ip, 630 xfs_off_t offset, 631 size_t count, 632 int ioflag, 633 xfs_bmbt_irec_t *ret_imap, 634 int *nmaps) 635 { 636 xfs_mount_t *mp = ip->i_mount; 637 xfs_iocore_t *io = &ip->i_iocore; 638 xfs_fileoff_t offset_fsb; 639 xfs_fileoff_t last_fsb; 640 xfs_off_t aligned_offset; 641 xfs_fileoff_t ioalign; 642 xfs_fsblock_t firstblock; 643 xfs_extlen_t extsz; 644 xfs_fsize_t isize; 645 int nimaps; 646 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; 647 int prealloc, fsynced = 0; 648 int error; 649 650 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); 651 652 /* 653 * Make sure that the dquots are there. This doesn't hold 654 * the ilock across a disk read. 655 */ 656 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); 657 if (error) 658 return XFS_ERROR(error); 659 660 if (XFS_IS_REALTIME_INODE(ip)) { 661 if (!(extsz = ip->i_d.di_extsize)) 662 extsz = mp->m_sb.sb_rextsize; 663 } else { 664 extsz = ip->i_d.di_extsize; 665 } 666 667 offset_fsb = XFS_B_TO_FSBT(mp, offset); 668 669 retry: 670 isize = ip->i_d.di_size; 671 if (io->io_new_size > isize) 672 isize = io->io_new_size; 673 674 error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count, 675 ioflag, imap, XFS_WRITE_IMAPS, &prealloc); 676 if (error) 677 return error; 678 679 if (prealloc) { 680 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); 681 ioalign = XFS_B_TO_FSBT(mp, aligned_offset); 682 last_fsb = ioalign + mp->m_writeio_blocks; 683 } else { 684 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 685 } 686 687 if (prealloc || extsz) { 688 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz, 689 &last_fsb); 690 if (error) 691 return error; 692 } 693 694 nimaps = XFS_WRITE_IMAPS; 695 firstblock = NULLFSBLOCK; 696 error = XFS_BMAPI(mp, NULL, io, offset_fsb, 697 (xfs_filblks_t)(last_fsb - offset_fsb), 698 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | 699 XFS_BMAPI_ENTIRE, &firstblock, 1, imap, 700 &nimaps, NULL, NULL); 701 if (error && (error != ENOSPC)) 702 return XFS_ERROR(error); 703 704 /* 705 * If bmapi returned us nothing, and if we didn't get back EDQUOT, 706 * then we must have run out of space - flush delalloc, and retry.. 707 */ 708 if (nimaps == 0) { 709 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, 710 io, offset, count); 711 if (xfs_flush_space(ip, &fsynced, &ioflag)) 712 return XFS_ERROR(ENOSPC); 713 714 error = 0; 715 goto retry; 716 } 717 718 if (!(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 719 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 720 "start_block : %llx start_off : %llx blkcnt : %llx " 721 "extent-state : %x \n", 722 (ip->i_mount)->m_fsname, 723 (long long)ip->i_ino, 724 (unsigned long long)ret_imap->br_startblock, 725 (unsigned long long)ret_imap->br_startoff, 726 (unsigned long long)ret_imap->br_blockcount, 727 ret_imap->br_state); 728 } 729 730 *ret_imap = imap[0]; 731 *nmaps = 1; 732 733 return 0; 734 } 735 736 /* 737 * Pass in a delayed allocate extent, convert it to real extents; 738 * return to the caller the extent we create which maps on top of 739 * the originating callers request. 740 * 741 * Called without a lock on the inode. 742 */ 743 int 744 xfs_iomap_write_allocate( 745 xfs_inode_t *ip, 746 xfs_off_t offset, 747 size_t count, 748 xfs_bmbt_irec_t *map, 749 int *retmap) 750 { 751 xfs_mount_t *mp = ip->i_mount; 752 xfs_iocore_t *io = &ip->i_iocore; 753 xfs_fileoff_t offset_fsb, last_block; 754 xfs_fileoff_t end_fsb, map_start_fsb; 755 xfs_fsblock_t first_block; 756 xfs_bmap_free_t free_list; 757 xfs_filblks_t count_fsb; 758 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; 759 xfs_trans_t *tp; 760 int i, nimaps, committed; 761 int error = 0; 762 int nres; 763 764 *retmap = 0; 765 766 /* 767 * Make sure that the dquots are there. 768 */ 769 if ((error = XFS_QM_DQATTACH(mp, ip, 0))) 770 return XFS_ERROR(error); 771 772 offset_fsb = XFS_B_TO_FSBT(mp, offset); 773 count_fsb = map->br_blockcount; 774 map_start_fsb = map->br_startoff; 775 776 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); 777 778 while (count_fsb != 0) { 779 /* 780 * Set up a transaction with which to allocate the 781 * backing store for the file. Do allocations in a 782 * loop until we get some space in the range we are 783 * interested in. The other space that might be allocated 784 * is in the delayed allocation extent on which we sit 785 * but before our buffer starts. 786 */ 787 788 nimaps = 0; 789 while (nimaps == 0) { 790 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 791 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); 792 error = xfs_trans_reserve(tp, nres, 793 XFS_WRITE_LOG_RES(mp), 794 0, XFS_TRANS_PERM_LOG_RES, 795 XFS_WRITE_LOG_COUNT); 796 if (error == ENOSPC) { 797 error = xfs_trans_reserve(tp, 0, 798 XFS_WRITE_LOG_RES(mp), 799 0, 800 XFS_TRANS_PERM_LOG_RES, 801 XFS_WRITE_LOG_COUNT); 802 } 803 if (error) { 804 xfs_trans_cancel(tp, 0); 805 return XFS_ERROR(error); 806 } 807 xfs_ilock(ip, XFS_ILOCK_EXCL); 808 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 809 xfs_trans_ihold(tp, ip); 810 811 XFS_BMAP_INIT(&free_list, &first_block); 812 813 nimaps = XFS_STRAT_WRITE_IMAPS; 814 /* 815 * Ensure we don't go beyond eof - it is possible 816 * the extents changed since we did the read call, 817 * we dropped the ilock in the interim. 818 */ 819 820 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size); 821 xfs_bmap_last_offset(NULL, ip, &last_block, 822 XFS_DATA_FORK); 823 last_block = XFS_FILEOFF_MAX(last_block, end_fsb); 824 if ((map_start_fsb + count_fsb) > last_block) { 825 count_fsb = last_block - map_start_fsb; 826 if (count_fsb == 0) { 827 error = EAGAIN; 828 goto trans_cancel; 829 } 830 } 831 832 /* Go get the actual blocks */ 833 error = XFS_BMAPI(mp, tp, io, map_start_fsb, count_fsb, 834 XFS_BMAPI_WRITE, &first_block, 1, 835 imap, &nimaps, &free_list, NULL); 836 if (error) 837 goto trans_cancel; 838 839 error = xfs_bmap_finish(&tp, &free_list, 840 first_block, &committed); 841 if (error) 842 goto trans_cancel; 843 844 error = xfs_trans_commit(tp, 845 XFS_TRANS_RELEASE_LOG_RES, NULL); 846 if (error) 847 goto error0; 848 849 xfs_iunlock(ip, XFS_ILOCK_EXCL); 850 } 851 852 /* 853 * See if we were able to allocate an extent that 854 * covers at least part of the callers request 855 */ 856 857 for (i = 0; i < nimaps; i++) { 858 if (!(io->io_flags & XFS_IOCORE_RT) && 859 !imap[i].br_startblock) { 860 cmn_err(CE_PANIC,"Access to block zero: " 861 "fs <%s> inode: %lld " 862 "start_block : %llx start_off : %llx " 863 "blkcnt : %llx extent-state : %x \n", 864 (ip->i_mount)->m_fsname, 865 (long long)ip->i_ino, 866 (unsigned long long) 867 imap[i].br_startblock, 868 (unsigned long long) 869 imap[i].br_startoff, 870 (unsigned long long) 871 imap[i].br_blockcount, 872 imap[i].br_state); 873 } 874 if ((offset_fsb >= imap[i].br_startoff) && 875 (offset_fsb < (imap[i].br_startoff + 876 imap[i].br_blockcount))) { 877 *map = imap[i]; 878 *retmap = 1; 879 XFS_STATS_INC(xs_xstrat_quick); 880 return 0; 881 } 882 count_fsb -= imap[i].br_blockcount; 883 } 884 885 /* So far we have not mapped the requested part of the 886 * file, just surrounding data, try again. 887 */ 888 nimaps--; 889 map_start_fsb = imap[nimaps].br_startoff + 890 imap[nimaps].br_blockcount; 891 } 892 893 trans_cancel: 894 xfs_bmap_cancel(&free_list); 895 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 896 error0: 897 xfs_iunlock(ip, XFS_ILOCK_EXCL); 898 return XFS_ERROR(error); 899 } 900 901 int 902 xfs_iomap_write_unwritten( 903 xfs_inode_t *ip, 904 xfs_off_t offset, 905 size_t count) 906 { 907 xfs_mount_t *mp = ip->i_mount; 908 xfs_iocore_t *io = &ip->i_iocore; 909 xfs_fileoff_t offset_fsb; 910 xfs_filblks_t count_fsb; 911 xfs_filblks_t numblks_fsb; 912 xfs_fsblock_t firstfsb; 913 int nimaps; 914 xfs_trans_t *tp; 915 xfs_bmbt_irec_t imap; 916 xfs_bmap_free_t free_list; 917 uint resblks; 918 int committed; 919 int error; 920 921 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, 922 &ip->i_iocore, offset, count); 923 924 offset_fsb = XFS_B_TO_FSBT(mp, offset); 925 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 926 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); 927 928 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; 929 930 do { 931 /* 932 * set up a transaction to convert the range of extents 933 * from unwritten to real. Do allocations in a loop until 934 * we have covered the range passed in. 935 */ 936 937 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 938 error = xfs_trans_reserve(tp, resblks, 939 XFS_WRITE_LOG_RES(mp), 0, 940 XFS_TRANS_PERM_LOG_RES, 941 XFS_WRITE_LOG_COUNT); 942 if (error) { 943 xfs_trans_cancel(tp, 0); 944 goto error0; 945 } 946 947 xfs_ilock(ip, XFS_ILOCK_EXCL); 948 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 949 xfs_trans_ihold(tp, ip); 950 951 /* 952 * Modify the unwritten extent state of the buffer. 953 */ 954 XFS_BMAP_INIT(&free_list, &firstfsb); 955 nimaps = 1; 956 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, 957 XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb, 958 1, &imap, &nimaps, &free_list, NULL); 959 if (error) 960 goto error_on_bmapi_transaction; 961 962 error = xfs_bmap_finish(&(tp), &(free_list), 963 firstfsb, &committed); 964 if (error) 965 goto error_on_bmapi_transaction; 966 967 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 968 xfs_iunlock(ip, XFS_ILOCK_EXCL); 969 if (error) 970 goto error0; 971 972 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) { 973 cmn_err(CE_PANIC,"Access to block zero: fs <%s> " 974 "inode: %lld start_block : %llx start_off : " 975 "%llx blkcnt : %llx extent-state : %x \n", 976 (ip->i_mount)->m_fsname, 977 (long long)ip->i_ino, 978 (unsigned long long)imap.br_startblock, 979 (unsigned long long)imap.br_startoff, 980 (unsigned long long)imap.br_blockcount, 981 imap.br_state); 982 } 983 984 if ((numblks_fsb = imap.br_blockcount) == 0) { 985 /* 986 * The numblks_fsb value should always get 987 * smaller, otherwise the loop is stuck. 988 */ 989 ASSERT(imap.br_blockcount); 990 break; 991 } 992 offset_fsb += numblks_fsb; 993 count_fsb -= numblks_fsb; 994 } while (count_fsb > 0); 995 996 return 0; 997 998 error_on_bmapi_transaction: 999 xfs_bmap_cancel(&free_list); 1000 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); 1001 xfs_iunlock(ip, XFS_ILOCK_EXCL); 1002 error0: 1003 return XFS_ERROR(error); 1004 } 1005