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, &imap, &nimaps); 312 break; 313 case BMAPI_UNWRITTEN: 314 lockmode = 0; 315 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count); 316 nimaps = 0; 317 break; 318 } 319 320 if (nimaps) { 321 *niomaps = xfs_imap_to_bmap(io, offset, &imap, 322 iomapp, nimaps, *niomaps, iomap_flags); 323 } else if (niomaps) { 324 *niomaps = 0; 325 } 326 327 out: 328 if (lockmode) 329 XFS_IUNLOCK(mp, io, lockmode); 330 return XFS_ERROR(error); 331 } 332 333 STATIC int 334 xfs_flush_space( 335 xfs_inode_t *ip, 336 int *fsynced, 337 int *ioflags) 338 { 339 switch (*fsynced) { 340 case 0: 341 if (ip->i_delayed_blks) { 342 xfs_iunlock(ip, XFS_ILOCK_EXCL); 343 xfs_flush_inode(ip); 344 xfs_ilock(ip, XFS_ILOCK_EXCL); 345 *fsynced = 1; 346 } else { 347 *ioflags |= BMAPI_SYNC; 348 *fsynced = 2; 349 } 350 return 0; 351 case 1: 352 *fsynced = 2; 353 *ioflags |= BMAPI_SYNC; 354 return 0; 355 case 2: 356 xfs_iunlock(ip, XFS_ILOCK_EXCL); 357 xfs_flush_device(ip); 358 xfs_ilock(ip, XFS_ILOCK_EXCL); 359 *fsynced = 3; 360 return 0; 361 } 362 return 1; 363 } 364 365 int 366 xfs_iomap_write_direct( 367 xfs_inode_t *ip, 368 loff_t offset, 369 size_t count, 370 int flags, 371 xfs_bmbt_irec_t *ret_imap, 372 int *nmaps, 373 int found) 374 { 375 xfs_mount_t *mp = ip->i_mount; 376 xfs_iocore_t *io = &ip->i_iocore; 377 xfs_fileoff_t offset_fsb; 378 xfs_fileoff_t last_fsb; 379 xfs_filblks_t count_fsb; 380 xfs_fsize_t isize; 381 xfs_fsblock_t firstfsb; 382 int nimaps, maps; 383 int error; 384 int bmapi_flag; 385 int rt; 386 xfs_trans_t *tp; 387 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp; 388 xfs_bmap_free_t free_list; 389 int aeof; 390 xfs_filblks_t datablocks; 391 int committed; 392 int numrtextents; 393 uint resblks; 394 395 /* 396 * Make sure that the dquots are there. This doesn't hold 397 * the ilock across a disk read. 398 */ 399 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED); 400 if (error) 401 return XFS_ERROR(error); 402 403 maps = min(XFS_WRITE_IMAPS, *nmaps); 404 nimaps = maps; 405 406 isize = ip->i_d.di_size; 407 aeof = (offset + count) > isize; 408 409 if (io->io_new_size > isize) 410 isize = io->io_new_size; 411 412 offset_fsb = XFS_B_TO_FSBT(mp, offset); 413 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 414 count_fsb = last_fsb - offset_fsb; 415 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) { 416 xfs_fileoff_t map_last_fsb; 417 418 map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff; 419 420 if (map_last_fsb < last_fsb) { 421 last_fsb = map_last_fsb; 422 count_fsb = last_fsb - offset_fsb; 423 } 424 ASSERT(count_fsb > 0); 425 } 426 427 /* 428 * determine if reserving space on 429 * the data or realtime partition. 430 */ 431 if ((rt = XFS_IS_REALTIME_INODE(ip))) { 432 int sbrtextsize, iprtextsize; 433 434 sbrtextsize = mp->m_sb.sb_rextsize; 435 iprtextsize = 436 ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize; 437 numrtextents = (count_fsb + iprtextsize - 1); 438 do_div(numrtextents, sbrtextsize); 439 datablocks = 0; 440 } else { 441 datablocks = count_fsb; 442 numrtextents = 0; 443 } 444 445 /* 446 * allocate and setup the transaction 447 */ 448 xfs_iunlock(ip, XFS_ILOCK_EXCL); 449 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 450 451 resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks); 452 453 error = xfs_trans_reserve(tp, resblks, 454 XFS_WRITE_LOG_RES(mp), numrtextents, 455 XFS_TRANS_PERM_LOG_RES, 456 XFS_WRITE_LOG_COUNT); 457 458 /* 459 * check for running out of space 460 */ 461 if (error) 462 /* 463 * Free the transaction structure. 464 */ 465 xfs_trans_cancel(tp, 0); 466 467 xfs_ilock(ip, XFS_ILOCK_EXCL); 468 469 if (error) 470 goto error_out; /* Don't return in above if .. trans .., 471 need lock to return */ 472 473 if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) { 474 error = (EDQUOT); 475 goto error1; 476 } 477 nimaps = 1; 478 479 bmapi_flag = XFS_BMAPI_WRITE; 480 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 481 xfs_trans_ihold(tp, ip); 482 483 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt)) 484 bmapi_flag |= XFS_BMAPI_PREALLOC; 485 486 /* 487 * issue the bmapi() call to allocate the blocks 488 */ 489 XFS_BMAP_INIT(&free_list, &firstfsb); 490 imapp = &imap[0]; 491 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, 492 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list); 493 if (error) { 494 goto error0; 495 } 496 497 /* 498 * complete the transaction 499 */ 500 501 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); 502 if (error) { 503 goto error0; 504 } 505 506 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 507 if (error) { 508 goto error_out; 509 } 510 511 /* copy any maps to caller's array and return any error. */ 512 if (nimaps == 0) { 513 error = (ENOSPC); 514 goto error_out; 515 } 516 517 *ret_imap = imap[0]; 518 *nmaps = 1; 519 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 520 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 521 "start_block : %llx start_off : %llx blkcnt : %llx " 522 "extent-state : %x \n", 523 (ip->i_mount)->m_fsname, 524 (long long)ip->i_ino, 525 ret_imap->br_startblock, ret_imap->br_startoff, 526 ret_imap->br_blockcount,ret_imap->br_state); 527 } 528 return 0; 529 530 error0: /* Cancel bmap, unlock inode, and cancel trans */ 531 xfs_bmap_cancel(&free_list); 532 533 error1: /* Just cancel transaction */ 534 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 535 *nmaps = 0; /* nothing set-up here */ 536 537 error_out: 538 return XFS_ERROR(error); 539 } 540 541 int 542 xfs_iomap_write_delay( 543 xfs_inode_t *ip, 544 loff_t offset, 545 size_t count, 546 int ioflag, 547 xfs_bmbt_irec_t *ret_imap, 548 int *nmaps) 549 { 550 xfs_mount_t *mp = ip->i_mount; 551 xfs_iocore_t *io = &ip->i_iocore; 552 xfs_fileoff_t offset_fsb; 553 xfs_fileoff_t last_fsb; 554 xfs_fsize_t isize; 555 xfs_fsblock_t firstblock; 556 int nimaps; 557 int error; 558 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; 559 int aeof; 560 int fsynced = 0; 561 562 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); 563 564 /* 565 * Make sure that the dquots are there. This doesn't hold 566 * the ilock across a disk read. 567 */ 568 569 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); 570 if (error) 571 return XFS_ERROR(error); 572 573 retry: 574 isize = ip->i_d.di_size; 575 if (io->io_new_size > isize) { 576 isize = io->io_new_size; 577 } 578 579 aeof = 0; 580 offset_fsb = XFS_B_TO_FSBT(mp, offset); 581 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 582 /* 583 * If the caller is doing a write at the end of the file, 584 * then extend the allocation (and the buffer used for the write) 585 * out to the file system's write iosize. We clean up any extra 586 * space left over when the file is closed in xfs_inactive(). 587 * 588 * For sync writes, we are flushing delayed allocate space to 589 * try to make additional space available for allocation near 590 * the filesystem full boundary - preallocation hurts in that 591 * situation, of course. 592 */ 593 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) { 594 xfs_off_t aligned_offset; 595 xfs_filblks_t count_fsb; 596 unsigned int iosize; 597 xfs_fileoff_t ioalign; 598 int n; 599 xfs_fileoff_t start_fsb; 600 601 /* 602 * If there are any real blocks past eof, then don't 603 * do any speculative allocation. 604 */ 605 start_fsb = XFS_B_TO_FSBT(mp, 606 ((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 nimaps = XFS_WRITE_IMAPS; 610 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 611 0, &firstblock, 0, imap, &nimaps, NULL); 612 if (error) { 613 return error; 614 } 615 for (n = 0; n < nimaps; n++) { 616 if ( !(io->io_flags & XFS_IOCORE_RT) && 617 !imap[n].br_startblock) { 618 cmn_err(CE_PANIC,"Access to block " 619 "zero: fs <%s> inode: %lld " 620 "start_block : %llx start_off " 621 ": %llx blkcnt : %llx " 622 "extent-state : %x \n", 623 (ip->i_mount)->m_fsname, 624 (long long)ip->i_ino, 625 imap[n].br_startblock, 626 imap[n].br_startoff, 627 imap[n].br_blockcount, 628 imap[n].br_state); 629 } 630 if ((imap[n].br_startblock != HOLESTARTBLOCK) && 631 (imap[n].br_startblock != DELAYSTARTBLOCK)) { 632 goto write_map; 633 } 634 start_fsb += imap[n].br_blockcount; 635 count_fsb -= imap[n].br_blockcount; 636 } 637 } 638 iosize = mp->m_writeio_blocks; 639 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); 640 ioalign = XFS_B_TO_FSBT(mp, aligned_offset); 641 last_fsb = ioalign + iosize; 642 aeof = 1; 643 } 644 write_map: 645 nimaps = XFS_WRITE_IMAPS; 646 firstblock = NULLFSBLOCK; 647 648 /* 649 * If mounted with the "-o swalloc" option, roundup the allocation 650 * request to a stripe width boundary if the file size is >= 651 * stripe width and we are allocating past the allocation eof. 652 */ 653 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth 654 && (mp->m_flags & XFS_MOUNT_SWALLOC) 655 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) { 656 int eof; 657 xfs_fileoff_t new_last_fsb; 658 659 new_last_fsb = roundup_64(last_fsb, mp->m_swidth); 660 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 661 if (error) { 662 return error; 663 } 664 if (eof) { 665 last_fsb = new_last_fsb; 666 } 667 /* 668 * Roundup the allocation request to a stripe unit (m_dalign) boundary 669 * if the file size is >= stripe unit size, and we are allocating past 670 * the allocation eof. 671 */ 672 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign && 673 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) { 674 int eof; 675 xfs_fileoff_t new_last_fsb; 676 new_last_fsb = roundup_64(last_fsb, mp->m_dalign); 677 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 678 if (error) { 679 return error; 680 } 681 if (eof) { 682 last_fsb = new_last_fsb; 683 } 684 /* 685 * Round up the allocation request to a real-time extent boundary 686 * if the file is on the real-time subvolume. 687 */ 688 } else if (io->io_flags & XFS_IOCORE_RT && aeof) { 689 int eof; 690 xfs_fileoff_t new_last_fsb; 691 692 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize); 693 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof); 694 if (error) { 695 return error; 696 } 697 if (eof) 698 last_fsb = new_last_fsb; 699 } 700 error = xfs_bmapi(NULL, ip, offset_fsb, 701 (xfs_filblks_t)(last_fsb - offset_fsb), 702 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | 703 XFS_BMAPI_ENTIRE, &firstblock, 1, imap, 704 &nimaps, NULL); 705 /* 706 * This can be EDQUOT, if nimaps == 0 707 */ 708 if (error && (error != ENOSPC)) { 709 return XFS_ERROR(error); 710 } 711 /* 712 * If bmapi returned us nothing, and if we didn't get back EDQUOT, 713 * then we must have run out of space. 714 */ 715 if (nimaps == 0) { 716 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, 717 io, offset, count); 718 if (xfs_flush_space(ip, &fsynced, &ioflag)) 719 return XFS_ERROR(ENOSPC); 720 721 error = 0; 722 goto retry; 723 } 724 725 *ret_imap = imap[0]; 726 *nmaps = 1; 727 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 728 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 729 "start_block : %llx start_off : %llx blkcnt : %llx " 730 "extent-state : %x \n", 731 (ip->i_mount)->m_fsname, 732 (long long)ip->i_ino, 733 ret_imap->br_startblock, ret_imap->br_startoff, 734 ret_imap->br_blockcount,ret_imap->br_state); 735 } 736 return 0; 737 } 738 739 /* 740 * Pass in a delayed allocate extent, convert it to real extents; 741 * return to the caller the extent we create which maps on top of 742 * the originating callers request. 743 * 744 * Called without a lock on the inode. 745 */ 746 int 747 xfs_iomap_write_allocate( 748 xfs_inode_t *ip, 749 xfs_bmbt_irec_t *map, 750 int *retmap) 751 { 752 xfs_mount_t *mp = ip->i_mount; 753 xfs_iocore_t *io = &ip->i_iocore; 754 xfs_fileoff_t offset_fsb, last_block; 755 xfs_fileoff_t end_fsb, map_start_fsb; 756 xfs_fsblock_t first_block; 757 xfs_bmap_free_t free_list; 758 xfs_filblks_t count_fsb; 759 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; 760 xfs_trans_t *tp; 761 int i, nimaps, committed; 762 int error = 0; 763 int nres; 764 765 *retmap = 0; 766 767 /* 768 * Make sure that the dquots are there. 769 */ 770 if ((error = XFS_QM_DQATTACH(mp, ip, 0))) 771 return XFS_ERROR(error); 772 773 offset_fsb = map->br_startoff; 774 count_fsb = map->br_blockcount; 775 map_start_fsb = offset_fsb; 776 777 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); 778 779 while (count_fsb != 0) { 780 /* 781 * Set up a transaction with which to allocate the 782 * backing store for the file. Do allocations in a 783 * loop until we get some space in the range we are 784 * interested in. The other space that might be allocated 785 * is in the delayed allocation extent on which we sit 786 * but before our buffer starts. 787 */ 788 789 nimaps = 0; 790 while (nimaps == 0) { 791 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 792 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); 793 error = xfs_trans_reserve(tp, nres, 794 XFS_WRITE_LOG_RES(mp), 795 0, XFS_TRANS_PERM_LOG_RES, 796 XFS_WRITE_LOG_COUNT); 797 if (error == ENOSPC) { 798 error = xfs_trans_reserve(tp, 0, 799 XFS_WRITE_LOG_RES(mp), 800 0, 801 XFS_TRANS_PERM_LOG_RES, 802 XFS_WRITE_LOG_COUNT); 803 } 804 if (error) { 805 xfs_trans_cancel(tp, 0); 806 return XFS_ERROR(error); 807 } 808 xfs_ilock(ip, XFS_ILOCK_EXCL); 809 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 810 xfs_trans_ihold(tp, ip); 811 812 XFS_BMAP_INIT(&free_list, &first_block); 813 814 nimaps = XFS_STRAT_WRITE_IMAPS; 815 /* 816 * Ensure we don't go beyond eof - it is possible 817 * the extents changed since we did the read call, 818 * we dropped the ilock in the interim. 819 */ 820 821 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size); 822 xfs_bmap_last_offset(NULL, ip, &last_block, 823 XFS_DATA_FORK); 824 last_block = XFS_FILEOFF_MAX(last_block, end_fsb); 825 if ((map_start_fsb + count_fsb) > last_block) { 826 count_fsb = last_block - map_start_fsb; 827 if (count_fsb == 0) { 828 error = EAGAIN; 829 goto trans_cancel; 830 } 831 } 832 833 /* Go get the actual blocks */ 834 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb, 835 XFS_BMAPI_WRITE, &first_block, 1, 836 imap, &nimaps, &free_list); 837 if (error) 838 goto trans_cancel; 839 840 error = xfs_bmap_finish(&tp, &free_list, 841 first_block, &committed); 842 if (error) 843 goto trans_cancel; 844 845 error = xfs_trans_commit(tp, 846 XFS_TRANS_RELEASE_LOG_RES, NULL); 847 if (error) 848 goto error0; 849 850 xfs_iunlock(ip, XFS_ILOCK_EXCL); 851 } 852 853 /* 854 * See if we were able to allocate an extent that 855 * covers at least part of the callers request 856 */ 857 858 for (i = 0; i < nimaps; i++) { 859 if ( !(io->io_flags & XFS_IOCORE_RT) && 860 !imap[i].br_startblock) { 861 cmn_err(CE_PANIC,"Access to block zero: " 862 "fs <%s> inode: %lld " 863 "start_block : %llx start_off : %llx " 864 "blkcnt : %llx extent-state : %x \n", 865 (ip->i_mount)->m_fsname, 866 (long long)ip->i_ino, 867 imap[i].br_startblock, 868 imap[i].br_startoff, 869 imap[i].br_blockcount,imap[i].br_state); 870 } 871 if ((map->br_startoff >= imap[i].br_startoff) && 872 (map->br_startoff < (imap[i].br_startoff + 873 imap[i].br_blockcount))) { 874 *map = imap[i]; 875 *retmap = 1; 876 XFS_STATS_INC(xs_xstrat_quick); 877 return 0; 878 } 879 count_fsb -= imap[i].br_blockcount; 880 } 881 882 /* So far we have not mapped the requested part of the 883 * file, just surrounding data, try again. 884 */ 885 nimaps--; 886 offset_fsb = imap[nimaps].br_startoff + 887 imap[nimaps].br_blockcount; 888 map_start_fsb = offset_fsb; 889 } 890 891 trans_cancel: 892 xfs_bmap_cancel(&free_list); 893 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 894 error0: 895 xfs_iunlock(ip, XFS_ILOCK_EXCL); 896 return XFS_ERROR(error); 897 } 898 899 int 900 xfs_iomap_write_unwritten( 901 xfs_inode_t *ip, 902 loff_t offset, 903 size_t count) 904 { 905 xfs_mount_t *mp = ip->i_mount; 906 xfs_iocore_t *io = &ip->i_iocore; 907 xfs_trans_t *tp; 908 xfs_fileoff_t offset_fsb; 909 xfs_filblks_t count_fsb; 910 xfs_filblks_t numblks_fsb; 911 xfs_bmbt_irec_t imap; 912 int committed; 913 int error; 914 int nres; 915 int nimaps; 916 xfs_fsblock_t firstfsb; 917 xfs_bmap_free_t free_list; 918 919 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, 920 &ip->i_iocore, offset, count); 921 922 offset_fsb = XFS_B_TO_FSBT(mp, offset); 923 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 924 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); 925 926 do { 927 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0); 928 929 /* 930 * set up a transaction to convert the range of extents 931 * from unwritten to real. Do allocations in a loop until 932 * we have covered the range passed in. 933 */ 934 935 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 936 error = xfs_trans_reserve(tp, nres, 937 XFS_WRITE_LOG_RES(mp), 0, 938 XFS_TRANS_PERM_LOG_RES, 939 XFS_WRITE_LOG_COUNT); 940 if (error) { 941 xfs_trans_cancel(tp, 0); 942 goto error0; 943 } 944 945 xfs_ilock(ip, XFS_ILOCK_EXCL); 946 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 947 xfs_trans_ihold(tp, ip); 948 949 /* 950 * Modify the unwritten extent state of the buffer. 951 */ 952 XFS_BMAP_INIT(&free_list, &firstfsb); 953 nimaps = 1; 954 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, 955 XFS_BMAPI_WRITE, &firstfsb, 956 1, &imap, &nimaps, &free_list); 957 if (error) 958 goto error_on_bmapi_transaction; 959 960 error = xfs_bmap_finish(&(tp), &(free_list), 961 firstfsb, &committed); 962 if (error) 963 goto error_on_bmapi_transaction; 964 965 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 966 xfs_iunlock(ip, XFS_ILOCK_EXCL); 967 if (error) 968 goto error0; 969 970 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) { 971 cmn_err(CE_PANIC,"Access to block zero: fs <%s> " 972 "inode: %lld start_block : %llx start_off : " 973 "%llx blkcnt : %llx extent-state : %x \n", 974 (ip->i_mount)->m_fsname, 975 (long long)ip->i_ino, 976 imap.br_startblock,imap.br_startoff, 977 imap.br_blockcount,imap.br_state); 978 } 979 980 if ((numblks_fsb = imap.br_blockcount) == 0) { 981 /* 982 * The numblks_fsb value should always get 983 * smaller, otherwise the loop is stuck. 984 */ 985 ASSERT(imap.br_blockcount); 986 break; 987 } 988 offset_fsb += numblks_fsb; 989 count_fsb -= numblks_fsb; 990 } while (count_fsb > 0); 991 992 return 0; 993 994 error_on_bmapi_transaction: 995 xfs_bmap_cancel(&free_list); 996 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); 997 xfs_iunlock(ip, XFS_ILOCK_EXCL); 998 error0: 999 return XFS_ERROR(error); 1000 } 1001