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 quota_flag; 389 int rt; 390 xfs_trans_t *tp; 391 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp; 392 xfs_bmap_free_t free_list; 393 int aeof; 394 xfs_filblks_t datablocks, qblocks, resblks; 395 int committed; 396 int numrtextents; 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 if (map_last_fsb < last_fsb) { 423 last_fsb = map_last_fsb; 424 count_fsb = last_fsb - offset_fsb; 425 } 426 ASSERT(count_fsb > 0); 427 } 428 429 /* 430 * Determine if reserving space on the data or realtime partition. 431 */ 432 if ((rt = XFS_IS_REALTIME_INODE(ip))) { 433 xfs_extlen_t extsz; 434 435 if (!(extsz = ip->i_d.di_extsize)) 436 extsz = mp->m_sb.sb_rextsize; 437 numrtextents = qblocks = (count_fsb + extsz - 1); 438 do_div(numrtextents, mp->m_sb.sb_rextsize); 439 quota_flag = XFS_QMOPT_RES_RTBLKS; 440 datablocks = 0; 441 } else { 442 datablocks = qblocks = count_fsb; 443 quota_flag = XFS_QMOPT_RES_REGBLKS; 444 numrtextents = 0; 445 } 446 447 /* 448 * Allocate and setup the transaction 449 */ 450 xfs_iunlock(ip, XFS_ILOCK_EXCL); 451 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 452 resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks); 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, note: need lock to return 460 */ 461 if (error) 462 xfs_trans_cancel(tp, 0); 463 xfs_ilock(ip, XFS_ILOCK_EXCL); 464 if (error) 465 goto error_out; 466 467 if (XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag)) { 468 error = (EDQUOT); 469 goto error1; 470 } 471 472 bmapi_flag = XFS_BMAPI_WRITE; 473 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 474 xfs_trans_ihold(tp, ip); 475 476 if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt)) 477 bmapi_flag |= XFS_BMAPI_PREALLOC; 478 479 /* 480 * Issue the bmapi() call to allocate the blocks 481 */ 482 XFS_BMAP_INIT(&free_list, &firstfsb); 483 nimaps = 1; 484 imapp = &imap[0]; 485 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, 486 bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list); 487 if (error) 488 goto error0; 489 490 /* 491 * Complete the transaction 492 */ 493 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); 494 if (error) 495 goto error0; 496 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 497 if (error) 498 goto error_out; 499 500 /* 501 * Copy any maps to caller's array and return any error. 502 */ 503 if (nimaps == 0) { 504 error = (ENOSPC); 505 goto error_out; 506 } 507 508 *ret_imap = imap[0]; 509 *nmaps = 1; 510 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 511 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 512 "start_block : %llx start_off : %llx blkcnt : %llx " 513 "extent-state : %x \n", 514 (ip->i_mount)->m_fsname, 515 (long long)ip->i_ino, 516 ret_imap->br_startblock, ret_imap->br_startoff, 517 ret_imap->br_blockcount,ret_imap->br_state); 518 } 519 return 0; 520 521 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ 522 xfs_bmap_cancel(&free_list); 523 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag); 524 525 error1: /* Just cancel transaction */ 526 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 527 *nmaps = 0; /* nothing set-up here */ 528 529 error_out: 530 return XFS_ERROR(error); 531 } 532 533 int 534 xfs_iomap_write_delay( 535 xfs_inode_t *ip, 536 xfs_off_t offset, 537 size_t count, 538 int ioflag, 539 xfs_bmbt_irec_t *ret_imap, 540 int *nmaps) 541 { 542 xfs_mount_t *mp = ip->i_mount; 543 xfs_iocore_t *io = &ip->i_iocore; 544 xfs_fileoff_t offset_fsb; 545 xfs_fileoff_t last_fsb; 546 xfs_fsize_t isize; 547 xfs_fsblock_t firstblock; 548 int nimaps; 549 int error; 550 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; 551 int aeof; 552 int fsynced = 0; 553 554 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); 555 556 /* 557 * Make sure that the dquots are there. This doesn't hold 558 * the ilock across a disk read. 559 */ 560 561 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); 562 if (error) 563 return XFS_ERROR(error); 564 565 retry: 566 isize = ip->i_d.di_size; 567 if (io->io_new_size > isize) { 568 isize = io->io_new_size; 569 } 570 571 aeof = 0; 572 offset_fsb = XFS_B_TO_FSBT(mp, offset); 573 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 574 /* 575 * If the caller is doing a write at the end of the file, 576 * then extend the allocation (and the buffer used for the write) 577 * out to the file system's write iosize. We clean up any extra 578 * space left over when the file is closed in xfs_inactive(). 579 * 580 * For sync writes, we are flushing delayed allocate space to 581 * try to make additional space available for allocation near 582 * the filesystem full boundary - preallocation hurts in that 583 * situation, of course. 584 */ 585 if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) { 586 xfs_off_t aligned_offset; 587 xfs_filblks_t count_fsb; 588 unsigned int iosize; 589 xfs_fileoff_t ioalign; 590 int n; 591 xfs_fileoff_t start_fsb; 592 593 /* 594 * If there are any real blocks past eof, then don't 595 * do any speculative allocation. 596 */ 597 start_fsb = XFS_B_TO_FSBT(mp, 598 ((xfs_ufsize_t)(offset + count - 1))); 599 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); 600 while (count_fsb > 0) { 601 nimaps = XFS_WRITE_IMAPS; 602 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 603 0, &firstblock, 0, imap, &nimaps, NULL); 604 if (error) { 605 return error; 606 } 607 for (n = 0; n < nimaps; n++) { 608 if ( !(io->io_flags & XFS_IOCORE_RT) && 609 !imap[n].br_startblock) { 610 cmn_err(CE_PANIC,"Access to block " 611 "zero: fs <%s> inode: %lld " 612 "start_block : %llx start_off " 613 ": %llx blkcnt : %llx " 614 "extent-state : %x \n", 615 (ip->i_mount)->m_fsname, 616 (long long)ip->i_ino, 617 imap[n].br_startblock, 618 imap[n].br_startoff, 619 imap[n].br_blockcount, 620 imap[n].br_state); 621 } 622 if ((imap[n].br_startblock != HOLESTARTBLOCK) && 623 (imap[n].br_startblock != DELAYSTARTBLOCK)) { 624 goto write_map; 625 } 626 start_fsb += imap[n].br_blockcount; 627 count_fsb -= imap[n].br_blockcount; 628 } 629 } 630 iosize = mp->m_writeio_blocks; 631 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); 632 ioalign = XFS_B_TO_FSBT(mp, aligned_offset); 633 last_fsb = ioalign + iosize; 634 aeof = 1; 635 } 636 write_map: 637 nimaps = XFS_WRITE_IMAPS; 638 firstblock = NULLFSBLOCK; 639 640 /* 641 * If mounted with the "-o swalloc" option, roundup the allocation 642 * request to a stripe width boundary if the file size is >= 643 * stripe width and we are allocating past the allocation eof. 644 */ 645 if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth 646 && (mp->m_flags & XFS_MOUNT_SWALLOC) 647 && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) { 648 int eof; 649 xfs_fileoff_t new_last_fsb; 650 651 new_last_fsb = roundup_64(last_fsb, mp->m_swidth); 652 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 653 if (error) { 654 return error; 655 } 656 if (eof) { 657 last_fsb = new_last_fsb; 658 } 659 /* 660 * Roundup the allocation request to a stripe unit (m_dalign) boundary 661 * if the file size is >= stripe unit size, and we are allocating past 662 * the allocation eof. 663 */ 664 } else if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign && 665 (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) { 666 int eof; 667 xfs_fileoff_t new_last_fsb; 668 new_last_fsb = roundup_64(last_fsb, mp->m_dalign); 669 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); 670 if (error) { 671 return error; 672 } 673 if (eof) { 674 last_fsb = new_last_fsb; 675 } 676 /* 677 * Round up the allocation request to a real-time extent boundary 678 * if the file is on the real-time subvolume. 679 */ 680 } else if (io->io_flags & XFS_IOCORE_RT && aeof) { 681 int eof; 682 xfs_fileoff_t new_last_fsb; 683 684 new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize); 685 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof); 686 if (error) { 687 return error; 688 } 689 if (eof) 690 last_fsb = new_last_fsb; 691 } 692 error = xfs_bmapi(NULL, ip, offset_fsb, 693 (xfs_filblks_t)(last_fsb - offset_fsb), 694 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | 695 XFS_BMAPI_ENTIRE, &firstblock, 1, imap, 696 &nimaps, NULL); 697 /* 698 * This can be EDQUOT, if nimaps == 0 699 */ 700 if (error && (error != ENOSPC)) { 701 return XFS_ERROR(error); 702 } 703 /* 704 * If bmapi returned us nothing, and if we didn't get back EDQUOT, 705 * then we must have run out of space. 706 */ 707 if (nimaps == 0) { 708 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, 709 io, offset, count); 710 if (xfs_flush_space(ip, &fsynced, &ioflag)) 711 return XFS_ERROR(ENOSPC); 712 713 error = 0; 714 goto retry; 715 } 716 717 *ret_imap = imap[0]; 718 *nmaps = 1; 719 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 720 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 721 "start_block : %llx start_off : %llx blkcnt : %llx " 722 "extent-state : %x \n", 723 (ip->i_mount)->m_fsname, 724 (long long)ip->i_ino, 725 ret_imap->br_startblock, ret_imap->br_startoff, 726 ret_imap->br_blockcount,ret_imap->br_state); 727 } 728 return 0; 729 } 730 731 /* 732 * Pass in a delayed allocate extent, convert it to real extents; 733 * return to the caller the extent we create which maps on top of 734 * the originating callers request. 735 * 736 * Called without a lock on the inode. 737 */ 738 int 739 xfs_iomap_write_allocate( 740 xfs_inode_t *ip, 741 xfs_off_t offset, 742 size_t count, 743 xfs_bmbt_irec_t *map, 744 int *retmap) 745 { 746 xfs_mount_t *mp = ip->i_mount; 747 xfs_iocore_t *io = &ip->i_iocore; 748 xfs_fileoff_t offset_fsb, last_block; 749 xfs_fileoff_t end_fsb, map_start_fsb; 750 xfs_fsblock_t first_block; 751 xfs_bmap_free_t free_list; 752 xfs_filblks_t count_fsb; 753 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; 754 xfs_trans_t *tp; 755 int i, nimaps, committed; 756 int error = 0; 757 int nres; 758 759 *retmap = 0; 760 761 /* 762 * Make sure that the dquots are there. 763 */ 764 if ((error = XFS_QM_DQATTACH(mp, ip, 0))) 765 return XFS_ERROR(error); 766 767 offset_fsb = XFS_B_TO_FSBT(mp, offset); 768 count_fsb = map->br_blockcount; 769 map_start_fsb = map->br_startoff; 770 771 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); 772 773 while (count_fsb != 0) { 774 /* 775 * Set up a transaction with which to allocate the 776 * backing store for the file. Do allocations in a 777 * loop until we get some space in the range we are 778 * interested in. The other space that might be allocated 779 * is in the delayed allocation extent on which we sit 780 * but before our buffer starts. 781 */ 782 783 nimaps = 0; 784 while (nimaps == 0) { 785 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 786 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); 787 error = xfs_trans_reserve(tp, nres, 788 XFS_WRITE_LOG_RES(mp), 789 0, XFS_TRANS_PERM_LOG_RES, 790 XFS_WRITE_LOG_COUNT); 791 if (error == ENOSPC) { 792 error = xfs_trans_reserve(tp, 0, 793 XFS_WRITE_LOG_RES(mp), 794 0, 795 XFS_TRANS_PERM_LOG_RES, 796 XFS_WRITE_LOG_COUNT); 797 } 798 if (error) { 799 xfs_trans_cancel(tp, 0); 800 return XFS_ERROR(error); 801 } 802 xfs_ilock(ip, XFS_ILOCK_EXCL); 803 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 804 xfs_trans_ihold(tp, ip); 805 806 XFS_BMAP_INIT(&free_list, &first_block); 807 808 nimaps = XFS_STRAT_WRITE_IMAPS; 809 /* 810 * Ensure we don't go beyond eof - it is possible 811 * the extents changed since we did the read call, 812 * we dropped the ilock in the interim. 813 */ 814 815 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size); 816 xfs_bmap_last_offset(NULL, ip, &last_block, 817 XFS_DATA_FORK); 818 last_block = XFS_FILEOFF_MAX(last_block, end_fsb); 819 if ((map_start_fsb + count_fsb) > last_block) { 820 count_fsb = last_block - map_start_fsb; 821 if (count_fsb == 0) { 822 error = EAGAIN; 823 goto trans_cancel; 824 } 825 } 826 827 /* Go get the actual blocks */ 828 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb, 829 XFS_BMAPI_WRITE, &first_block, 1, 830 imap, &nimaps, &free_list); 831 if (error) 832 goto trans_cancel; 833 834 error = xfs_bmap_finish(&tp, &free_list, 835 first_block, &committed); 836 if (error) 837 goto trans_cancel; 838 839 error = xfs_trans_commit(tp, 840 XFS_TRANS_RELEASE_LOG_RES, NULL); 841 if (error) 842 goto error0; 843 844 xfs_iunlock(ip, XFS_ILOCK_EXCL); 845 } 846 847 /* 848 * See if we were able to allocate an extent that 849 * covers at least part of the callers request 850 */ 851 852 for (i = 0; i < nimaps; i++) { 853 if ( !(io->io_flags & XFS_IOCORE_RT) && 854 !imap[i].br_startblock) { 855 cmn_err(CE_PANIC,"Access to block zero: " 856 "fs <%s> inode: %lld " 857 "start_block : %llx start_off : %llx " 858 "blkcnt : %llx extent-state : %x \n", 859 (ip->i_mount)->m_fsname, 860 (long long)ip->i_ino, 861 imap[i].br_startblock, 862 imap[i].br_startoff, 863 imap[i].br_blockcount,imap[i].br_state); 864 } 865 if ((offset_fsb >= imap[i].br_startoff) && 866 (offset_fsb < (imap[i].br_startoff + 867 imap[i].br_blockcount))) { 868 *map = imap[i]; 869 *retmap = 1; 870 XFS_STATS_INC(xs_xstrat_quick); 871 return 0; 872 } 873 count_fsb -= imap[i].br_blockcount; 874 } 875 876 /* So far we have not mapped the requested part of the 877 * file, just surrounding data, try again. 878 */ 879 nimaps--; 880 map_start_fsb = imap[nimaps].br_startoff + 881 imap[nimaps].br_blockcount; 882 } 883 884 trans_cancel: 885 xfs_bmap_cancel(&free_list); 886 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 887 error0: 888 xfs_iunlock(ip, XFS_ILOCK_EXCL); 889 return XFS_ERROR(error); 890 } 891 892 int 893 xfs_iomap_write_unwritten( 894 xfs_inode_t *ip, 895 xfs_off_t offset, 896 size_t count) 897 { 898 xfs_mount_t *mp = ip->i_mount; 899 xfs_iocore_t *io = &ip->i_iocore; 900 xfs_trans_t *tp; 901 xfs_fileoff_t offset_fsb; 902 xfs_filblks_t count_fsb; 903 xfs_filblks_t numblks_fsb; 904 xfs_bmbt_irec_t imap; 905 int committed; 906 int error; 907 int nres; 908 int nimaps; 909 xfs_fsblock_t firstfsb; 910 xfs_bmap_free_t free_list; 911 912 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, 913 &ip->i_iocore, offset, count); 914 915 offset_fsb = XFS_B_TO_FSBT(mp, offset); 916 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 917 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); 918 919 do { 920 nres = XFS_DIOSTRAT_SPACE_RES(mp, 0); 921 922 /* 923 * set up a transaction to convert the range of extents 924 * from unwritten to real. Do allocations in a loop until 925 * we have covered the range passed in. 926 */ 927 928 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 929 error = xfs_trans_reserve(tp, nres, 930 XFS_WRITE_LOG_RES(mp), 0, 931 XFS_TRANS_PERM_LOG_RES, 932 XFS_WRITE_LOG_COUNT); 933 if (error) { 934 xfs_trans_cancel(tp, 0); 935 goto error0; 936 } 937 938 xfs_ilock(ip, XFS_ILOCK_EXCL); 939 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 940 xfs_trans_ihold(tp, ip); 941 942 /* 943 * Modify the unwritten extent state of the buffer. 944 */ 945 XFS_BMAP_INIT(&free_list, &firstfsb); 946 nimaps = 1; 947 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, 948 XFS_BMAPI_WRITE, &firstfsb, 949 1, &imap, &nimaps, &free_list); 950 if (error) 951 goto error_on_bmapi_transaction; 952 953 error = xfs_bmap_finish(&(tp), &(free_list), 954 firstfsb, &committed); 955 if (error) 956 goto error_on_bmapi_transaction; 957 958 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 959 xfs_iunlock(ip, XFS_ILOCK_EXCL); 960 if (error) 961 goto error0; 962 963 if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) { 964 cmn_err(CE_PANIC,"Access to block zero: fs <%s> " 965 "inode: %lld start_block : %llx start_off : " 966 "%llx blkcnt : %llx extent-state : %x \n", 967 (ip->i_mount)->m_fsname, 968 (long long)ip->i_ino, 969 imap.br_startblock,imap.br_startoff, 970 imap.br_blockcount,imap.br_state); 971 } 972 973 if ((numblks_fsb = imap.br_blockcount) == 0) { 974 /* 975 * The numblks_fsb value should always get 976 * smaller, otherwise the loop is stuck. 977 */ 978 ASSERT(imap.br_blockcount); 979 break; 980 } 981 offset_fsb += numblks_fsb; 982 count_fsb -= numblks_fsb; 983 } while (count_fsb > 0); 984 985 return 0; 986 987 error_on_bmapi_transaction: 988 xfs_bmap_cancel(&free_list); 989 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); 990 xfs_iunlock(ip, XFS_ILOCK_EXCL); 991 error0: 992 return XFS_ERROR(error); 993 } 994