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