1 /* 2 * Copyright (c) 2000-2005 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_dir.h" 27 #include "xfs_dir2.h" 28 #include "xfs_alloc.h" 29 #include "xfs_dmapi.h" 30 #include "xfs_quota.h" 31 #include "xfs_mount.h" 32 #include "xfs_bmap_btree.h" 33 #include "xfs_alloc_btree.h" 34 #include "xfs_ialloc_btree.h" 35 #include "xfs_dir_sf.h" 36 #include "xfs_dir2_sf.h" 37 #include "xfs_attr_sf.h" 38 #include "xfs_dinode.h" 39 #include "xfs_inode.h" 40 #include "xfs_ialloc.h" 41 #include "xfs_btree.h" 42 #include "xfs_bmap.h" 43 #include "xfs_bit.h" 44 #include "xfs_rtalloc.h" 45 #include "xfs_error.h" 46 #include "xfs_itable.h" 47 #include "xfs_rw.h" 48 #include "xfs_acl.h" 49 #include "xfs_cap.h" 50 #include "xfs_mac.h" 51 #include "xfs_attr.h" 52 #include "xfs_buf_item.h" 53 #include "xfs_trans_space.h" 54 #include "xfs_utils.h" 55 #include "xfs_iomap.h" 56 57 #if defined(XFS_RW_TRACE) 58 void 59 xfs_iomap_enter_trace( 60 int tag, 61 xfs_iocore_t *io, 62 xfs_off_t offset, 63 ssize_t count) 64 { 65 xfs_inode_t *ip = XFS_IO_INODE(io); 66 67 if (!ip->i_rwtrace) 68 return; 69 70 ktrace_enter(ip->i_rwtrace, 71 (void *)((unsigned long)tag), 72 (void *)ip, 73 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 74 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 75 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 76 (void *)((unsigned long)(offset & 0xffffffff)), 77 (void *)((unsigned long)count), 78 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)), 79 (void *)((unsigned long)(io->io_new_size & 0xffffffff)), 80 (void *)NULL, 81 (void *)NULL, 82 (void *)NULL, 83 (void *)NULL, 84 (void *)NULL, 85 (void *)NULL, 86 (void *)NULL); 87 } 88 89 void 90 xfs_iomap_map_trace( 91 int tag, 92 xfs_iocore_t *io, 93 xfs_off_t offset, 94 ssize_t count, 95 xfs_iomap_t *iomapp, 96 xfs_bmbt_irec_t *imapp, 97 int flags) 98 { 99 xfs_inode_t *ip = XFS_IO_INODE(io); 100 101 if (!ip->i_rwtrace) 102 return; 103 104 ktrace_enter(ip->i_rwtrace, 105 (void *)((unsigned long)tag), 106 (void *)ip, 107 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 108 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 109 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 110 (void *)((unsigned long)(offset & 0xffffffff)), 111 (void *)((unsigned long)count), 112 (void *)((unsigned long)flags), 113 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)), 114 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)), 115 (void *)((unsigned long)(iomapp->iomap_delta)), 116 (void *)((unsigned long)(iomapp->iomap_bsize)), 117 (void *)((unsigned long)(iomapp->iomap_bn)), 118 (void *)(__psint_t)(imapp->br_startoff), 119 (void *)((unsigned long)(imapp->br_blockcount)), 120 (void *)(__psint_t)(imapp->br_startblock)); 121 } 122 #else 123 #define xfs_iomap_enter_trace(tag, io, offset, count) 124 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags) 125 #endif 126 127 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ 128 << mp->m_writeio_log) 129 #define XFS_STRAT_WRITE_IMAPS 2 130 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP 131 132 STATIC int 133 xfs_imap_to_bmap( 134 xfs_iocore_t *io, 135 xfs_off_t offset, 136 xfs_bmbt_irec_t *imap, 137 xfs_iomap_t *iomapp, 138 int imaps, /* Number of imap entries */ 139 int iomaps, /* Number of iomap entries */ 140 int flags) 141 { 142 xfs_mount_t *mp; 143 xfs_fsize_t nisize; 144 int pbm; 145 xfs_fsblock_t start_block; 146 147 mp = io->io_mount; 148 nisize = XFS_SIZE(mp, io); 149 if (io->io_new_size > nisize) 150 nisize = io->io_new_size; 151 152 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) { 153 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff); 154 iomapp->iomap_delta = offset - iomapp->iomap_offset; 155 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount); 156 iomapp->iomap_flags = flags; 157 158 if (io->io_flags & XFS_IOCORE_RT) { 159 iomapp->iomap_flags |= IOMAP_REALTIME; 160 iomapp->iomap_target = mp->m_rtdev_targp; 161 } else { 162 iomapp->iomap_target = mp->m_ddev_targp; 163 } 164 start_block = imap->br_startblock; 165 if (start_block == HOLESTARTBLOCK) { 166 iomapp->iomap_bn = IOMAP_DADDR_NULL; 167 iomapp->iomap_flags |= IOMAP_HOLE; 168 } else if (start_block == DELAYSTARTBLOCK) { 169 iomapp->iomap_bn = IOMAP_DADDR_NULL; 170 iomapp->iomap_flags |= IOMAP_DELAY; 171 } else { 172 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block); 173 if (ISUNWRITTEN(imap)) 174 iomapp->iomap_flags |= IOMAP_UNWRITTEN; 175 } 176 177 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) { 178 iomapp->iomap_flags |= IOMAP_EOF; 179 } 180 181 offset += iomapp->iomap_bsize - iomapp->iomap_delta; 182 } 183 return pbm; /* Return the number filled */ 184 } 185 186 int 187 xfs_iomap( 188 xfs_iocore_t *io, 189 xfs_off_t offset, 190 ssize_t count, 191 int flags, 192 xfs_iomap_t *iomapp, 193 int *niomaps) 194 { 195 xfs_mount_t *mp = io->io_mount; 196 xfs_fileoff_t offset_fsb, end_fsb; 197 int error = 0; 198 int lockmode = 0; 199 xfs_bmbt_irec_t imap; 200 int nimaps = 1; 201 int bmapi_flags = 0; 202 int iomap_flags = 0; 203 204 if (XFS_FORCED_SHUTDOWN(mp)) 205 return XFS_ERROR(EIO); 206 207 switch (flags & 208 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE | 209 BMAPI_UNWRITTEN | BMAPI_DEVICE)) { 210 case BMAPI_READ: 211 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count); 212 lockmode = XFS_LCK_MAP_SHARED(mp, io); 213 bmapi_flags = XFS_BMAPI_ENTIRE; 214 break; 215 case BMAPI_WRITE: 216 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count); 217 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR; 218 if (flags & BMAPI_IGNSTATE) 219 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE; 220 XFS_ILOCK(mp, io, lockmode); 221 break; 222 case BMAPI_ALLOCATE: 223 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count); 224 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD; 225 bmapi_flags = XFS_BMAPI_ENTIRE; 226 /* Attempt non-blocking lock */ 227 if (flags & BMAPI_TRYLOCK) { 228 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode)) 229 return XFS_ERROR(EAGAIN); 230 } else { 231 XFS_ILOCK(mp, io, lockmode); 232 } 233 break; 234 case BMAPI_UNWRITTEN: 235 goto phase2; 236 case BMAPI_DEVICE: 237 lockmode = XFS_LCK_MAP_SHARED(mp, io); 238 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ? 239 mp->m_rtdev_targp : mp->m_ddev_targp; 240 error = 0; 241 *niomaps = 1; 242 goto out; 243 default: 244 BUG(); 245 } 246 247 ASSERT(offset <= mp->m_maxioffset); 248 if ((xfs_fsize_t)offset + count > mp->m_maxioffset) 249 count = mp->m_maxioffset - offset; 250 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 251 offset_fsb = XFS_B_TO_FSBT(mp, offset); 252 253 error = XFS_BMAPI(mp, NULL, io, offset_fsb, 254 (xfs_filblks_t)(end_fsb - offset_fsb), 255 bmapi_flags, NULL, 0, &imap, 256 &nimaps, NULL); 257 258 if (error) 259 goto out; 260 261 phase2: 262 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) { 263 case BMAPI_WRITE: 264 /* If we found an extent, return it */ 265 if (nimaps && 266 (imap.br_startblock != HOLESTARTBLOCK) && 267 (imap.br_startblock != DELAYSTARTBLOCK)) { 268 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 269 offset, count, iomapp, &imap, flags); 270 break; 271 } 272 273 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) { 274 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset, 275 count, flags, &imap, &nimaps, nimaps); 276 } else { 277 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, 278 flags, &imap, &nimaps); 279 } 280 if (!error) { 281 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io, 282 offset, count, iomapp, &imap, flags); 283 } 284 iomap_flags = IOMAP_NEW; 285 break; 286 case BMAPI_ALLOCATE: 287 /* If we found an extent, return it */ 288 XFS_IUNLOCK(mp, io, lockmode); 289 lockmode = 0; 290 291 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) { 292 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 293 offset, count, iomapp, &imap, flags); 294 break; 295 } 296 297 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, 298 &imap, &nimaps); 299 break; 300 case BMAPI_UNWRITTEN: 301 lockmode = 0; 302 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count); 303 nimaps = 0; 304 break; 305 } 306 307 if (nimaps) { 308 *niomaps = xfs_imap_to_bmap(io, offset, &imap, 309 iomapp, nimaps, *niomaps, iomap_flags); 310 } else if (niomaps) { 311 *niomaps = 0; 312 } 313 314 out: 315 if (lockmode) 316 XFS_IUNLOCK(mp, io, lockmode); 317 return XFS_ERROR(error); 318 } 319 320 STATIC int 321 xfs_flush_space( 322 xfs_inode_t *ip, 323 int *fsynced, 324 int *ioflags) 325 { 326 switch (*fsynced) { 327 case 0: 328 if (ip->i_delayed_blks) { 329 xfs_iunlock(ip, XFS_ILOCK_EXCL); 330 xfs_flush_inode(ip); 331 xfs_ilock(ip, XFS_ILOCK_EXCL); 332 *fsynced = 1; 333 } else { 334 *ioflags |= BMAPI_SYNC; 335 *fsynced = 2; 336 } 337 return 0; 338 case 1: 339 *fsynced = 2; 340 *ioflags |= BMAPI_SYNC; 341 return 0; 342 case 2: 343 xfs_iunlock(ip, XFS_ILOCK_EXCL); 344 xfs_flush_device(ip); 345 xfs_ilock(ip, XFS_ILOCK_EXCL); 346 *fsynced = 3; 347 return 0; 348 } 349 return 1; 350 } 351 352 int 353 xfs_iomap_write_direct( 354 xfs_inode_t *ip, 355 xfs_off_t offset, 356 size_t count, 357 int flags, 358 xfs_bmbt_irec_t *ret_imap, 359 int *nmaps, 360 int found) 361 { 362 xfs_mount_t *mp = ip->i_mount; 363 xfs_iocore_t *io = &ip->i_iocore; 364 xfs_fileoff_t offset_fsb; 365 xfs_fileoff_t last_fsb; 366 xfs_filblks_t count_fsb; 367 xfs_fsblock_t firstfsb; 368 int nimaps; 369 int error; 370 int bmapi_flag; 371 int quota_flag; 372 int rt; 373 xfs_trans_t *tp; 374 xfs_bmbt_irec_t imap; 375 xfs_bmap_free_t free_list; 376 xfs_filblks_t qblocks, resblks; 377 int committed; 378 int resrtextents; 379 380 /* 381 * Make sure that the dquots are there. This doesn't hold 382 * the ilock across a disk read. 383 */ 384 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED); 385 if (error) 386 return XFS_ERROR(error); 387 388 offset_fsb = XFS_B_TO_FSBT(mp, offset); 389 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 390 count_fsb = last_fsb - offset_fsb; 391 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) { 392 xfs_fileoff_t map_last_fsb; 393 394 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff; 395 if (map_last_fsb < last_fsb) { 396 last_fsb = map_last_fsb; 397 count_fsb = last_fsb - offset_fsb; 398 } 399 ASSERT(count_fsb > 0); 400 } 401 402 /* 403 * Determine if reserving space on the data or realtime partition. 404 */ 405 if ((rt = XFS_IS_REALTIME_INODE(ip))) { 406 xfs_extlen_t extsz; 407 408 if (!(extsz = ip->i_d.di_extsize)) 409 extsz = mp->m_sb.sb_rextsize; 410 resrtextents = qblocks = (count_fsb + extsz - 1); 411 do_div(resrtextents, mp->m_sb.sb_rextsize); 412 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); 413 quota_flag = XFS_QMOPT_RES_RTBLKS; 414 } else { 415 resrtextents = 0; 416 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, count_fsb); 417 quota_flag = XFS_QMOPT_RES_REGBLKS; 418 } 419 420 /* 421 * Allocate and setup the transaction 422 */ 423 xfs_iunlock(ip, XFS_ILOCK_EXCL); 424 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 425 error = xfs_trans_reserve(tp, resblks, 426 XFS_WRITE_LOG_RES(mp), resrtextents, 427 XFS_TRANS_PERM_LOG_RES, 428 XFS_WRITE_LOG_COUNT); 429 430 /* 431 * Check for running out of space, note: need lock to return 432 */ 433 if (error) 434 xfs_trans_cancel(tp, 0); 435 xfs_ilock(ip, XFS_ILOCK_EXCL); 436 if (error) 437 goto error_out; 438 439 if (XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag)) { 440 error = (EDQUOT); 441 goto error1; 442 } 443 444 bmapi_flag = XFS_BMAPI_WRITE; 445 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 446 xfs_trans_ihold(tp, ip); 447 448 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt)) 449 bmapi_flag |= XFS_BMAPI_PREALLOC; 450 451 /* 452 * Issue the bmapi() call to allocate the blocks 453 */ 454 XFS_BMAP_INIT(&free_list, &firstfsb); 455 nimaps = 1; 456 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, 457 bmapi_flag, &firstfsb, 0, &imap, &nimaps, &free_list); 458 if (error) 459 goto error0; 460 461 /* 462 * Complete the transaction 463 */ 464 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); 465 if (error) 466 goto error0; 467 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 468 if (error) 469 goto error_out; 470 471 /* 472 * Copy any maps to caller's array and return any error. 473 */ 474 if (nimaps == 0) { 475 error = (ENOSPC); 476 goto error_out; 477 } 478 479 *ret_imap = imap; 480 *nmaps = 1; 481 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 482 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 483 "start_block : %llx start_off : %llx blkcnt : %llx " 484 "extent-state : %x \n", 485 (ip->i_mount)->m_fsname, 486 (long long)ip->i_ino, 487 ret_imap->br_startblock, ret_imap->br_startoff, 488 ret_imap->br_blockcount,ret_imap->br_state); 489 } 490 return 0; 491 492 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ 493 xfs_bmap_cancel(&free_list); 494 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag); 495 496 error1: /* Just cancel transaction */ 497 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 498 *nmaps = 0; /* nothing set-up here */ 499 500 error_out: 501 return XFS_ERROR(error); 502 } 503 504 int 505 xfs_iomap_write_delay( 506 xfs_inode_t *ip, 507 xfs_off_t offset, 508 size_t count, 509 int ioflag, 510 xfs_bmbt_irec_t *ret_imap, 511 int *nmaps) 512 { 513 xfs_mount_t *mp = ip->i_mount; 514 xfs_iocore_t *io = &ip->i_iocore; 515 xfs_fileoff_t offset_fsb; 516 xfs_fileoff_t last_fsb; 517 xfs_fsize_t isize; 518 xfs_fsblock_t firstblock; 519 int nimaps; 520 int error; 521 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; 522 int aeof; 523 int fsynced = 0; 524 525 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); 526 527 /* 528 * Make sure that the dquots are there. This doesn't hold 529 * the ilock across a disk read. 530 */ 531 532 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); 533 if (error) 534 return XFS_ERROR(error); 535 536 retry: 537 isize = ip->i_d.di_size; 538 if (io->io_new_size > isize) { 539 isize = io->io_new_size; 540 } 541 542 aeof = 0; 543 offset_fsb = XFS_B_TO_FSBT(mp, offset); 544 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 545 /* 546 * If the caller is doing a write at the end of the file, 547 * then extend the allocation (and the buffer used for the write) 548 * out to the file system's write iosize. We clean up any extra 549 * space left over when the file is closed in xfs_inactive(). 550 * 551 * For sync writes, we are flushing delayed allocate space to 552 * try to make additional space available for allocation near 553 * the filesystem full boundary - preallocation hurts in that 554 * situation, of course. 555 */ 556 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) { 557 xfs_off_t aligned_offset; 558 xfs_filblks_t count_fsb; 559 unsigned int iosize; 560 xfs_fileoff_t ioalign; 561 int n; 562 xfs_fileoff_t start_fsb; 563 564 /* 565 * If there are any real blocks past eof, then don't 566 * do any speculative allocation. 567 */ 568 start_fsb = XFS_B_TO_FSBT(mp, 569 ((xfs_ufsize_t)(offset + count - 1))); 570 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); 571 while (count_fsb > 0) { 572 nimaps = XFS_WRITE_IMAPS; 573 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 574 0, &firstblock, 0, imap, &nimaps, NULL); 575 if (error) { 576 return error; 577 } 578 for (n = 0; n < nimaps; n++) { 579 if ( !(io->io_flags & XFS_IOCORE_RT) && 580 !imap[n].br_startblock) { 581 cmn_err(CE_PANIC,"Access to block " 582 "zero: fs <%s> inode: %lld " 583 "start_block : %llx start_off " 584 ": %llx blkcnt : %llx " 585 "extent-state : %x \n", 586 (ip->i_mount)->m_fsname, 587 (long long)ip->i_ino, 588 imap[n].br_startblock, 589 imap[n].br_startoff, 590 imap[n].br_blockcount, 591 imap[n].br_state); 592 } 593 if ((imap[n].br_startblock != HOLESTARTBLOCK) && 594 (imap[n].br_startblock != DELAYSTARTBLOCK)) { 595 goto write_map; 596 } 597 start_fsb += imap[n].br_blockcount; 598 count_fsb -= imap[n].br_blockcount; 599 } 600 } 601 iosize = mp->m_writeio_blocks; 602 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); 603 ioalign = XFS_B_TO_FSBT(mp, aligned_offset); 604 last_fsb = ioalign + iosize; 605 aeof = 1; 606 } 607 write_map: 608 nimaps = XFS_WRITE_IMAPS; 609 firstblock = NULLFSBLOCK; 610 611 /* 612 * If mounted with the "-o swalloc" option, roundup the allocation 613 * request to a stripe width boundary if the file size is >= 614 * stripe width and we are allocating past the allocation eof. 615 */ 616 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth 617 && (mp->m_flags & XFS_MOUNT_SWALLOC) 618 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) { 619 int eof; 620 xfs_fileoff_t new_last_fsb; 621 622 new_last_fsb = roundup_64(last_fsb, mp->m_swidth); 623 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 624 if (error) { 625 return error; 626 } 627 if (eof) { 628 last_fsb = new_last_fsb; 629 } 630 /* 631 * Roundup the allocation request to a stripe unit (m_dalign) boundary 632 * if the file size is >= stripe unit size, and we are allocating past 633 * the allocation eof. 634 */ 635 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign && 636 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) { 637 int eof; 638 xfs_fileoff_t new_last_fsb; 639 new_last_fsb = roundup_64(last_fsb, mp->m_dalign); 640 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 641 if (error) { 642 return error; 643 } 644 if (eof) { 645 last_fsb = new_last_fsb; 646 } 647 /* 648 * Round up the allocation request to a real-time extent boundary 649 * if the file is on the real-time subvolume. 650 */ 651 } else if (io->io_flags & XFS_IOCORE_RT && aeof) { 652 int eof; 653 xfs_fileoff_t new_last_fsb; 654 655 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize); 656 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof); 657 if (error) { 658 return error; 659 } 660 if (eof) 661 last_fsb = new_last_fsb; 662 } 663 error = xfs_bmapi(NULL, ip, offset_fsb, 664 (xfs_filblks_t)(last_fsb - offset_fsb), 665 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | 666 XFS_BMAPI_ENTIRE, &firstblock, 1, imap, 667 &nimaps, NULL); 668 /* 669 * This can be EDQUOT, if nimaps == 0 670 */ 671 if (error && (error != ENOSPC)) { 672 return XFS_ERROR(error); 673 } 674 /* 675 * If bmapi returned us nothing, and if we didn't get back EDQUOT, 676 * then we must have run out of space. 677 */ 678 if (nimaps == 0) { 679 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, 680 io, offset, count); 681 if (xfs_flush_space(ip, &fsynced, &ioflag)) 682 return XFS_ERROR(ENOSPC); 683 684 error = 0; 685 goto retry; 686 } 687 688 *ret_imap = imap[0]; 689 *nmaps = 1; 690 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 691 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 692 "start_block : %llx start_off : %llx blkcnt : %llx " 693 "extent-state : %x \n", 694 (ip->i_mount)->m_fsname, 695 (long long)ip->i_ino, 696 ret_imap->br_startblock, ret_imap->br_startoff, 697 ret_imap->br_blockcount,ret_imap->br_state); 698 } 699 return 0; 700 } 701 702 /* 703 * Pass in a delayed allocate extent, convert it to real extents; 704 * return to the caller the extent we create which maps on top of 705 * the originating callers request. 706 * 707 * Called without a lock on the inode. 708 */ 709 int 710 xfs_iomap_write_allocate( 711 xfs_inode_t *ip, 712 xfs_off_t offset, 713 size_t count, 714 xfs_bmbt_irec_t *map, 715 int *retmap) 716 { 717 xfs_mount_t *mp = ip->i_mount; 718 xfs_iocore_t *io = &ip->i_iocore; 719 xfs_fileoff_t offset_fsb, last_block; 720 xfs_fileoff_t end_fsb, map_start_fsb; 721 xfs_fsblock_t first_block; 722 xfs_bmap_free_t free_list; 723 xfs_filblks_t count_fsb; 724 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; 725 xfs_trans_t *tp; 726 int i, nimaps, committed; 727 int error = 0; 728 int nres; 729 730 *retmap = 0; 731 732 /* 733 * Make sure that the dquots are there. 734 */ 735 if ((error = XFS_QM_DQATTACH(mp, ip, 0))) 736 return XFS_ERROR(error); 737 738 offset_fsb = XFS_B_TO_FSBT(mp, offset); 739 count_fsb = map->br_blockcount; 740 map_start_fsb = map->br_startoff; 741 742 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); 743 744 while (count_fsb != 0) { 745 /* 746 * Set up a transaction with which to allocate the 747 * backing store for the file. Do allocations in a 748 * loop until we get some space in the range we are 749 * interested in. The other space that might be allocated 750 * is in the delayed allocation extent on which we sit 751 * but before our buffer starts. 752 */ 753 754 nimaps = 0; 755 while (nimaps == 0) { 756 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 757 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); 758 error = xfs_trans_reserve(tp, nres, 759 XFS_WRITE_LOG_RES(mp), 760 0, XFS_TRANS_PERM_LOG_RES, 761 XFS_WRITE_LOG_COUNT); 762 if (error == ENOSPC) { 763 error = xfs_trans_reserve(tp, 0, 764 XFS_WRITE_LOG_RES(mp), 765 0, 766 XFS_TRANS_PERM_LOG_RES, 767 XFS_WRITE_LOG_COUNT); 768 } 769 if (error) { 770 xfs_trans_cancel(tp, 0); 771 return XFS_ERROR(error); 772 } 773 xfs_ilock(ip, XFS_ILOCK_EXCL); 774 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 775 xfs_trans_ihold(tp, ip); 776 777 XFS_BMAP_INIT(&free_list, &first_block); 778 779 nimaps = XFS_STRAT_WRITE_IMAPS; 780 /* 781 * Ensure we don't go beyond eof - it is possible 782 * the extents changed since we did the read call, 783 * we dropped the ilock in the interim. 784 */ 785 786 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size); 787 xfs_bmap_last_offset(NULL, ip, &last_block, 788 XFS_DATA_FORK); 789 last_block = XFS_FILEOFF_MAX(last_block, end_fsb); 790 if ((map_start_fsb + count_fsb) > last_block) { 791 count_fsb = last_block - map_start_fsb; 792 if (count_fsb == 0) { 793 error = EAGAIN; 794 goto trans_cancel; 795 } 796 } 797 798 /* Go get the actual blocks */ 799 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb, 800 XFS_BMAPI_WRITE, &first_block, 1, 801 imap, &nimaps, &free_list); 802 if (error) 803 goto trans_cancel; 804 805 error = xfs_bmap_finish(&tp, &free_list, 806 first_block, &committed); 807 if (error) 808 goto trans_cancel; 809 810 error = xfs_trans_commit(tp, 811 XFS_TRANS_RELEASE_LOG_RES, NULL); 812 if (error) 813 goto error0; 814 815 xfs_iunlock(ip, XFS_ILOCK_EXCL); 816 } 817 818 /* 819 * See if we were able to allocate an extent that 820 * covers at least part of the callers request 821 */ 822 823 for (i = 0; i < nimaps; i++) { 824 if ( !(io->io_flags & XFS_IOCORE_RT) && 825 !imap[i].br_startblock) { 826 cmn_err(CE_PANIC,"Access to block zero: " 827 "fs <%s> inode: %lld " 828 "start_block : %llx start_off : %llx " 829 "blkcnt : %llx extent-state : %x \n", 830 (ip->i_mount)->m_fsname, 831 (long long)ip->i_ino, 832 imap[i].br_startblock, 833 imap[i].br_startoff, 834 imap[i].br_blockcount,imap[i].br_state); 835 } 836 if ((offset_fsb >= imap[i].br_startoff) && 837 (offset_fsb < (imap[i].br_startoff + 838 imap[i].br_blockcount))) { 839 *map = imap[i]; 840 *retmap = 1; 841 XFS_STATS_INC(xs_xstrat_quick); 842 return 0; 843 } 844 count_fsb -= imap[i].br_blockcount; 845 } 846 847 /* So far we have not mapped the requested part of the 848 * file, just surrounding data, try again. 849 */ 850 nimaps--; 851 map_start_fsb = imap[nimaps].br_startoff + 852 imap[nimaps].br_blockcount; 853 } 854 855 trans_cancel: 856 xfs_bmap_cancel(&free_list); 857 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 858 error0: 859 xfs_iunlock(ip, XFS_ILOCK_EXCL); 860 return XFS_ERROR(error); 861 } 862 863 int 864 xfs_iomap_write_unwritten( 865 xfs_inode_t *ip, 866 xfs_off_t offset, 867 size_t count) 868 { 869 xfs_mount_t *mp = ip->i_mount; 870 xfs_iocore_t *io = &ip->i_iocore; 871 xfs_trans_t *tp; 872 xfs_fileoff_t offset_fsb; 873 xfs_filblks_t count_fsb; 874 xfs_filblks_t numblks_fsb; 875 xfs_bmbt_irec_t imap; 876 int committed; 877 int error; 878 int nres; 879 int nimaps; 880 xfs_fsblock_t firstfsb; 881 xfs_bmap_free_t free_list; 882 883 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, 884 &ip->i_iocore, offset, count); 885 886 offset_fsb = XFS_B_TO_FSBT(mp, offset); 887 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 888 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); 889 890 do { 891 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0); 892 893 /* 894 * set up a transaction to convert the range of extents 895 * from unwritten to real. Do allocations in a loop until 896 * we have covered the range passed in. 897 */ 898 899 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 900 error = xfs_trans_reserve(tp, nres, 901 XFS_WRITE_LOG_RES(mp), 0, 902 XFS_TRANS_PERM_LOG_RES, 903 XFS_WRITE_LOG_COUNT); 904 if (error) { 905 xfs_trans_cancel(tp, 0); 906 goto error0; 907 } 908 909 xfs_ilock(ip, XFS_ILOCK_EXCL); 910 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 911 xfs_trans_ihold(tp, ip); 912 913 /* 914 * Modify the unwritten extent state of the buffer. 915 */ 916 XFS_BMAP_INIT(&free_list, &firstfsb); 917 nimaps = 1; 918 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, 919 XFS_BMAPI_WRITE, &firstfsb, 920 1, &imap, &nimaps, &free_list); 921 if (error) 922 goto error_on_bmapi_transaction; 923 924 error = xfs_bmap_finish(&(tp), &(free_list), 925 firstfsb, &committed); 926 if (error) 927 goto error_on_bmapi_transaction; 928 929 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 930 xfs_iunlock(ip, XFS_ILOCK_EXCL); 931 if (error) 932 goto error0; 933 934 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) { 935 cmn_err(CE_PANIC,"Access to block zero: fs <%s> " 936 "inode: %lld start_block : %llx start_off : " 937 "%llx blkcnt : %llx extent-state : %x \n", 938 (ip->i_mount)->m_fsname, 939 (long long)ip->i_ino, 940 imap.br_startblock,imap.br_startoff, 941 imap.br_blockcount,imap.br_state); 942 } 943 944 if ((numblks_fsb = imap.br_blockcount) == 0) { 945 /* 946 * The numblks_fsb value should always get 947 * smaller, otherwise the loop is stuck. 948 */ 949 ASSERT(imap.br_blockcount); 950 break; 951 } 952 offset_fsb += numblks_fsb; 953 count_fsb -= numblks_fsb; 954 } while (count_fsb > 0); 955 956 return 0; 957 958 error_on_bmapi_transaction: 959 xfs_bmap_cancel(&free_list); 960 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); 961 xfs_iunlock(ip, XFS_ILOCK_EXCL); 962 error0: 963 return XFS_ERROR(error); 964 } 965