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 && (imap.br_startblock != HOLESTARTBLOCK)) { 282 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 283 offset, count, iomapp, &imap, flags); 284 break; 285 } 286 287 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) { 288 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset, 289 count, flags, &imap, &nimaps, nimaps); 290 } else { 291 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, 292 flags, &imap, &nimaps); 293 } 294 if (!error) { 295 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io, 296 offset, count, iomapp, &imap, flags); 297 } 298 iomap_flags = IOMAP_NEW; 299 break; 300 case BMAPI_ALLOCATE: 301 /* If we found an extent, return it */ 302 XFS_IUNLOCK(mp, io, lockmode); 303 lockmode = 0; 304 305 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) { 306 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 307 offset, count, iomapp, &imap, flags); 308 break; 309 } 310 311 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, 312 &imap, &nimaps); 313 break; 314 case BMAPI_UNWRITTEN: 315 lockmode = 0; 316 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count); 317 nimaps = 0; 318 break; 319 } 320 321 if (nimaps) { 322 *niomaps = xfs_imap_to_bmap(io, offset, &imap, 323 iomapp, nimaps, *niomaps, iomap_flags); 324 } else if (niomaps) { 325 *niomaps = 0; 326 } 327 328 out: 329 if (lockmode) 330 XFS_IUNLOCK(mp, io, lockmode); 331 return XFS_ERROR(error); 332 } 333 334 STATIC int 335 xfs_flush_space( 336 xfs_inode_t *ip, 337 int *fsynced, 338 int *ioflags) 339 { 340 switch (*fsynced) { 341 case 0: 342 if (ip->i_delayed_blks) { 343 xfs_iunlock(ip, XFS_ILOCK_EXCL); 344 xfs_flush_inode(ip); 345 xfs_ilock(ip, XFS_ILOCK_EXCL); 346 *fsynced = 1; 347 } else { 348 *ioflags |= BMAPI_SYNC; 349 *fsynced = 2; 350 } 351 return 0; 352 case 1: 353 *fsynced = 2; 354 *ioflags |= BMAPI_SYNC; 355 return 0; 356 case 2: 357 xfs_iunlock(ip, XFS_ILOCK_EXCL); 358 xfs_flush_device(ip); 359 xfs_ilock(ip, XFS_ILOCK_EXCL); 360 *fsynced = 3; 361 return 0; 362 } 363 return 1; 364 } 365 366 int 367 xfs_iomap_write_direct( 368 xfs_inode_t *ip, 369 xfs_off_t offset, 370 size_t count, 371 int flags, 372 xfs_bmbt_irec_t *ret_imap, 373 int *nmaps, 374 int found) 375 { 376 xfs_mount_t *mp = ip->i_mount; 377 xfs_iocore_t *io = &ip->i_iocore; 378 xfs_fileoff_t offset_fsb; 379 xfs_fileoff_t last_fsb; 380 xfs_filblks_t count_fsb; 381 xfs_fsize_t isize; 382 xfs_fsblock_t firstfsb; 383 int nimaps, maps; 384 int error; 385 int bmapi_flag; 386 int rt; 387 xfs_trans_t *tp; 388 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp; 389 xfs_bmap_free_t free_list; 390 int aeof; 391 xfs_filblks_t datablocks; 392 int committed; 393 int numrtextents; 394 uint resblks; 395 396 /* 397 * Make sure that the dquots are there. This doesn't hold 398 * the ilock across a disk read. 399 */ 400 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED); 401 if (error) 402 return XFS_ERROR(error); 403 404 maps = min(XFS_WRITE_IMAPS, *nmaps); 405 nimaps = maps; 406 407 isize = ip->i_d.di_size; 408 aeof = (offset + count) > isize; 409 410 if (io->io_new_size > isize) 411 isize = io->io_new_size; 412 413 offset_fsb = XFS_B_TO_FSBT(mp, offset); 414 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 415 count_fsb = last_fsb - offset_fsb; 416 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) { 417 xfs_fileoff_t map_last_fsb; 418 419 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff; 420 421 if (map_last_fsb < last_fsb) { 422 last_fsb = map_last_fsb; 423 count_fsb = last_fsb - offset_fsb; 424 } 425 ASSERT(count_fsb > 0); 426 } 427 428 /* 429 * determine if reserving space on 430 * the data or realtime partition. 431 */ 432 if ((rt = XFS_IS_REALTIME_INODE(ip))) { 433 int sbrtextsize, iprtextsize; 434 435 sbrtextsize = mp->m_sb.sb_rextsize; 436 iprtextsize = 437 ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize; 438 numrtextents = (count_fsb + iprtextsize - 1); 439 do_div(numrtextents, sbrtextsize); 440 datablocks = 0; 441 } else { 442 datablocks = count_fsb; 443 numrtextents = 0; 444 } 445 446 /* 447 * allocate and setup the transaction 448 */ 449 xfs_iunlock(ip, XFS_ILOCK_EXCL); 450 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 451 452 resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks); 453 454 error = xfs_trans_reserve(tp, resblks, 455 XFS_WRITE_LOG_RES(mp), numrtextents, 456 XFS_TRANS_PERM_LOG_RES, 457 XFS_WRITE_LOG_COUNT); 458 459 /* 460 * check for running out of space 461 */ 462 if (error) 463 /* 464 * Free the transaction structure. 465 */ 466 xfs_trans_cancel(tp, 0); 467 468 xfs_ilock(ip, XFS_ILOCK_EXCL); 469 470 if (error) 471 goto error_out; /* Don't return in above if .. trans .., 472 need lock to return */ 473 474 if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) { 475 error = (EDQUOT); 476 goto error1; 477 } 478 nimaps = 1; 479 480 bmapi_flag = XFS_BMAPI_WRITE; 481 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 482 xfs_trans_ihold(tp, ip); 483 484 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt)) 485 bmapi_flag |= XFS_BMAPI_PREALLOC; 486 487 /* 488 * issue the bmapi() call to allocate the blocks 489 */ 490 XFS_BMAP_INIT(&free_list, &firstfsb); 491 imapp = &imap[0]; 492 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, 493 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list); 494 if (error) { 495 goto error0; 496 } 497 498 /* 499 * complete the transaction 500 */ 501 502 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); 503 if (error) { 504 goto error0; 505 } 506 507 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 508 if (error) { 509 goto error_out; 510 } 511 512 /* copy any maps to caller's array and return any error. */ 513 if (nimaps == 0) { 514 error = (ENOSPC); 515 goto error_out; 516 } 517 518 *ret_imap = imap[0]; 519 *nmaps = 1; 520 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 521 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 522 "start_block : %llx start_off : %llx blkcnt : %llx " 523 "extent-state : %x \n", 524 (ip->i_mount)->m_fsname, 525 (long long)ip->i_ino, 526 ret_imap->br_startblock, ret_imap->br_startoff, 527 ret_imap->br_blockcount,ret_imap->br_state); 528 } 529 return 0; 530 531 error0: /* Cancel bmap, unlock inode, and cancel trans */ 532 xfs_bmap_cancel(&free_list); 533 534 error1: /* Just cancel transaction */ 535 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 536 *nmaps = 0; /* nothing set-up here */ 537 538 error_out: 539 return XFS_ERROR(error); 540 } 541 542 int 543 xfs_iomap_write_delay( 544 xfs_inode_t *ip, 545 xfs_off_t offset, 546 size_t count, 547 int ioflag, 548 xfs_bmbt_irec_t *ret_imap, 549 int *nmaps) 550 { 551 xfs_mount_t *mp = ip->i_mount; 552 xfs_iocore_t *io = &ip->i_iocore; 553 xfs_fileoff_t offset_fsb; 554 xfs_fileoff_t last_fsb; 555 xfs_fsize_t isize; 556 xfs_fsblock_t firstblock; 557 int nimaps; 558 int error; 559 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; 560 int aeof; 561 int fsynced = 0; 562 563 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); 564 565 /* 566 * Make sure that the dquots are there. This doesn't hold 567 * the ilock across a disk read. 568 */ 569 570 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); 571 if (error) 572 return XFS_ERROR(error); 573 574 retry: 575 isize = ip->i_d.di_size; 576 if (io->io_new_size > isize) { 577 isize = io->io_new_size; 578 } 579 580 aeof = 0; 581 offset_fsb = XFS_B_TO_FSBT(mp, offset); 582 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 583 /* 584 * If the caller is doing a write at the end of the file, 585 * then extend the allocation (and the buffer used for the write) 586 * out to the file system's write iosize. We clean up any extra 587 * space left over when the file is closed in xfs_inactive(). 588 * 589 * For sync writes, we are flushing delayed allocate space to 590 * try to make additional space available for allocation near 591 * the filesystem full boundary - preallocation hurts in that 592 * situation, of course. 593 */ 594 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) { 595 xfs_off_t aligned_offset; 596 xfs_filblks_t count_fsb; 597 unsigned int iosize; 598 xfs_fileoff_t ioalign; 599 int n; 600 xfs_fileoff_t start_fsb; 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, 607 ((xfs_ufsize_t)(offset + count - 1))); 608 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); 609 while (count_fsb > 0) { 610 nimaps = XFS_WRITE_IMAPS; 611 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 612 0, &firstblock, 0, imap, &nimaps, NULL); 613 if (error) { 614 return error; 615 } 616 for (n = 0; n < nimaps; n++) { 617 if ( !(io->io_flags & XFS_IOCORE_RT) && 618 !imap[n].br_startblock) { 619 cmn_err(CE_PANIC,"Access to block " 620 "zero: fs <%s> inode: %lld " 621 "start_block : %llx start_off " 622 ": %llx blkcnt : %llx " 623 "extent-state : %x \n", 624 (ip->i_mount)->m_fsname, 625 (long long)ip->i_ino, 626 imap[n].br_startblock, 627 imap[n].br_startoff, 628 imap[n].br_blockcount, 629 imap[n].br_state); 630 } 631 if ((imap[n].br_startblock != HOLESTARTBLOCK) && 632 (imap[n].br_startblock != DELAYSTARTBLOCK)) { 633 goto write_map; 634 } 635 start_fsb += imap[n].br_blockcount; 636 count_fsb -= imap[n].br_blockcount; 637 } 638 } 639 iosize = mp->m_writeio_blocks; 640 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); 641 ioalign = XFS_B_TO_FSBT(mp, aligned_offset); 642 last_fsb = ioalign + iosize; 643 aeof = 1; 644 } 645 write_map: 646 nimaps = XFS_WRITE_IMAPS; 647 firstblock = NULLFSBLOCK; 648 649 /* 650 * If mounted with the "-o swalloc" option, roundup the allocation 651 * request to a stripe width boundary if the file size is >= 652 * stripe width and we are allocating past the allocation eof. 653 */ 654 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth 655 && (mp->m_flags & XFS_MOUNT_SWALLOC) 656 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) { 657 int eof; 658 xfs_fileoff_t new_last_fsb; 659 660 new_last_fsb = roundup_64(last_fsb, mp->m_swidth); 661 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 662 if (error) { 663 return error; 664 } 665 if (eof) { 666 last_fsb = new_last_fsb; 667 } 668 /* 669 * Roundup the allocation request to a stripe unit (m_dalign) boundary 670 * if the file size is >= stripe unit size, and we are allocating past 671 * the allocation eof. 672 */ 673 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign && 674 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) { 675 int eof; 676 xfs_fileoff_t new_last_fsb; 677 new_last_fsb = roundup_64(last_fsb, mp->m_dalign); 678 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 679 if (error) { 680 return error; 681 } 682 if (eof) { 683 last_fsb = new_last_fsb; 684 } 685 /* 686 * Round up the allocation request to a real-time extent boundary 687 * if the file is on the real-time subvolume. 688 */ 689 } else if (io->io_flags & XFS_IOCORE_RT && aeof) { 690 int eof; 691 xfs_fileoff_t new_last_fsb; 692 693 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize); 694 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof); 695 if (error) { 696 return error; 697 } 698 if (eof) 699 last_fsb = new_last_fsb; 700 } 701 error = xfs_bmapi(NULL, ip, offset_fsb, 702 (xfs_filblks_t)(last_fsb - offset_fsb), 703 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | 704 XFS_BMAPI_ENTIRE, &firstblock, 1, imap, 705 &nimaps, NULL); 706 /* 707 * This can be EDQUOT, if nimaps == 0 708 */ 709 if (error && (error != ENOSPC)) { 710 return XFS_ERROR(error); 711 } 712 /* 713 * If bmapi returned us nothing, and if we didn't get back EDQUOT, 714 * then we must have run out of space. 715 */ 716 if (nimaps == 0) { 717 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, 718 io, offset, count); 719 if (xfs_flush_space(ip, &fsynced, &ioflag)) 720 return XFS_ERROR(ENOSPC); 721 722 error = 0; 723 goto retry; 724 } 725 726 *ret_imap = imap[0]; 727 *nmaps = 1; 728 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 729 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 730 "start_block : %llx start_off : %llx blkcnt : %llx " 731 "extent-state : %x \n", 732 (ip->i_mount)->m_fsname, 733 (long long)ip->i_ino, 734 ret_imap->br_startblock, ret_imap->br_startoff, 735 ret_imap->br_blockcount,ret_imap->br_state); 736 } 737 return 0; 738 } 739 740 /* 741 * Pass in a delayed allocate extent, convert it to real extents; 742 * return to the caller the extent we create which maps on top of 743 * the originating callers request. 744 * 745 * Called without a lock on the inode. 746 */ 747 int 748 xfs_iomap_write_allocate( 749 xfs_inode_t *ip, 750 xfs_off_t offset, 751 size_t count, 752 xfs_bmbt_irec_t *map, 753 int *retmap) 754 { 755 xfs_mount_t *mp = ip->i_mount; 756 xfs_iocore_t *io = &ip->i_iocore; 757 xfs_fileoff_t offset_fsb, last_block; 758 xfs_fileoff_t end_fsb, map_start_fsb; 759 xfs_fsblock_t first_block; 760 xfs_bmap_free_t free_list; 761 xfs_filblks_t count_fsb; 762 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; 763 xfs_trans_t *tp; 764 int i, nimaps, committed; 765 int error = 0; 766 int nres; 767 768 *retmap = 0; 769 770 /* 771 * Make sure that the dquots are there. 772 */ 773 if ((error = XFS_QM_DQATTACH(mp, ip, 0))) 774 return XFS_ERROR(error); 775 776 offset_fsb = XFS_B_TO_FSBT(mp, offset); 777 count_fsb = map->br_blockcount; 778 map_start_fsb = map->br_startoff; 779 780 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); 781 782 while (count_fsb != 0) { 783 /* 784 * Set up a transaction with which to allocate the 785 * backing store for the file. Do allocations in a 786 * loop until we get some space in the range we are 787 * interested in. The other space that might be allocated 788 * is in the delayed allocation extent on which we sit 789 * but before our buffer starts. 790 */ 791 792 nimaps = 0; 793 while (nimaps == 0) { 794 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 795 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); 796 error = xfs_trans_reserve(tp, nres, 797 XFS_WRITE_LOG_RES(mp), 798 0, XFS_TRANS_PERM_LOG_RES, 799 XFS_WRITE_LOG_COUNT); 800 if (error == ENOSPC) { 801 error = xfs_trans_reserve(tp, 0, 802 XFS_WRITE_LOG_RES(mp), 803 0, 804 XFS_TRANS_PERM_LOG_RES, 805 XFS_WRITE_LOG_COUNT); 806 } 807 if (error) { 808 xfs_trans_cancel(tp, 0); 809 return XFS_ERROR(error); 810 } 811 xfs_ilock(ip, XFS_ILOCK_EXCL); 812 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 813 xfs_trans_ihold(tp, ip); 814 815 XFS_BMAP_INIT(&free_list, &first_block); 816 817 nimaps = XFS_STRAT_WRITE_IMAPS; 818 /* 819 * Ensure we don't go beyond eof - it is possible 820 * the extents changed since we did the read call, 821 * we dropped the ilock in the interim. 822 */ 823 824 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size); 825 xfs_bmap_last_offset(NULL, ip, &last_block, 826 XFS_DATA_FORK); 827 last_block = XFS_FILEOFF_MAX(last_block, end_fsb); 828 if ((map_start_fsb + count_fsb) > last_block) { 829 count_fsb = last_block - map_start_fsb; 830 if (count_fsb == 0) { 831 error = EAGAIN; 832 goto trans_cancel; 833 } 834 } 835 836 /* Go get the actual blocks */ 837 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb, 838 XFS_BMAPI_WRITE, &first_block, 1, 839 imap, &nimaps, &free_list); 840 if (error) 841 goto trans_cancel; 842 843 error = xfs_bmap_finish(&tp, &free_list, 844 first_block, &committed); 845 if (error) 846 goto trans_cancel; 847 848 error = xfs_trans_commit(tp, 849 XFS_TRANS_RELEASE_LOG_RES, NULL); 850 if (error) 851 goto error0; 852 853 xfs_iunlock(ip, XFS_ILOCK_EXCL); 854 } 855 856 /* 857 * See if we were able to allocate an extent that 858 * covers at least part of the callers request 859 */ 860 861 for (i = 0; i < nimaps; i++) { 862 if ( !(io->io_flags & XFS_IOCORE_RT) && 863 !imap[i].br_startblock) { 864 cmn_err(CE_PANIC,"Access to block zero: " 865 "fs <%s> inode: %lld " 866 "start_block : %llx start_off : %llx " 867 "blkcnt : %llx extent-state : %x \n", 868 (ip->i_mount)->m_fsname, 869 (long long)ip->i_ino, 870 imap[i].br_startblock, 871 imap[i].br_startoff, 872 imap[i].br_blockcount,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_trans_t *tp; 910 xfs_fileoff_t offset_fsb; 911 xfs_filblks_t count_fsb; 912 xfs_filblks_t numblks_fsb; 913 xfs_bmbt_irec_t imap; 914 int committed; 915 int error; 916 int nres; 917 int nimaps; 918 xfs_fsblock_t firstfsb; 919 xfs_bmap_free_t free_list; 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 do { 929 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0); 930 931 /* 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, nres, 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(tp, ip, offset_fsb, count_fsb, 957 XFS_BMAPI_WRITE, &firstfsb, 958 1, &imap, &nimaps, &free_list); 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 imap.br_startblock,imap.br_startoff, 979 imap.br_blockcount,imap.br_state); 980 } 981 982 if ((numblks_fsb = imap.br_blockcount) == 0) { 983 /* 984 * The numblks_fsb value should always get 985 * smaller, otherwise the loop is stuck. 986 */ 987 ASSERT(imap.br_blockcount); 988 break; 989 } 990 offset_fsb += numblks_fsb; 991 count_fsb -= numblks_fsb; 992 } while (count_fsb > 0); 993 994 return 0; 995 996 error_on_bmapi_transaction: 997 xfs_bmap_cancel(&free_list); 998 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); 999 xfs_iunlock(ip, XFS_ILOCK_EXCL); 1000 error0: 1001 return XFS_ERROR(error); 1002 } 1003