1/* 2 * Copyright (c) 2000-2006 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18#include "xfs.h" 19#include "xfs_fs.h" 20#include "xfs_bit.h" 21#include "xfs_log.h" 22#include "xfs_inum.h" 23#include "xfs_trans.h" 24#include "xfs_sb.h" 25#include "xfs_ag.h" 26#include "xfs_dir.h" 27#include "xfs_dir2.h" 28#include "xfs_alloc.h" 29#include "xfs_dmapi.h" 30#include "xfs_quota.h" 31#include "xfs_mount.h" 32#include "xfs_bmap_btree.h" 33#include "xfs_alloc_btree.h" 34#include "xfs_ialloc_btree.h" 35#include "xfs_dir_sf.h" 36#include "xfs_dir2_sf.h" 37#include "xfs_attr_sf.h" 38#include "xfs_dinode.h" 39#include "xfs_inode.h" 40#include "xfs_ialloc.h" 41#include "xfs_btree.h" 42#include "xfs_bmap.h" 43#include "xfs_rtalloc.h" 44#include "xfs_error.h" 45#include "xfs_itable.h" 46#include "xfs_rw.h" 47#include "xfs_acl.h" 48#include "xfs_cap.h" 49#include "xfs_mac.h" 50#include "xfs_attr.h" 51#include "xfs_buf_item.h" 52#include "xfs_trans_space.h" 53#include "xfs_utils.h" 54#include "xfs_iomap.h" 55 56#if defined(XFS_RW_TRACE) 57void 58xfs_iomap_enter_trace( 59 int tag, 60 xfs_iocore_t *io, 61 xfs_off_t offset, 62 ssize_t count) 63{ 64 xfs_inode_t *ip = XFS_IO_INODE(io); 65 66 if (!ip->i_rwtrace) 67 return; 68 69 ktrace_enter(ip->i_rwtrace, 70 (void *)((unsigned long)tag), 71 (void *)ip, 72 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 73 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 74 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 75 (void *)((unsigned long)(offset & 0xffffffff)), 76 (void *)((unsigned long)count), 77 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)), 78 (void *)((unsigned long)(io->io_new_size & 0xffffffff)), 79 (void *)((unsigned long)current_pid()), 80 (void *)NULL, 81 (void *)NULL, 82 (void *)NULL, 83 (void *)NULL, 84 (void *)NULL, 85 (void *)NULL); 86} 87 88void 89xfs_iomap_map_trace( 90 int tag, 91 xfs_iocore_t *io, 92 xfs_off_t offset, 93 ssize_t count, 94 xfs_iomap_t *iomapp, 95 xfs_bmbt_irec_t *imapp, 96 int flags) 97{ 98 xfs_inode_t *ip = XFS_IO_INODE(io); 99 100 if (!ip->i_rwtrace) 101 return; 102 103 ktrace_enter(ip->i_rwtrace, 104 (void *)((unsigned long)tag), 105 (void *)ip, 106 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), 107 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), 108 (void *)((unsigned long)((offset >> 32) & 0xffffffff)), 109 (void *)((unsigned long)(offset & 0xffffffff)), 110 (void *)((unsigned long)count), 111 (void *)((unsigned long)flags), 112 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)), 113 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)), 114 (void *)((unsigned long)(iomapp->iomap_delta)), 115 (void *)((unsigned long)(iomapp->iomap_bsize)), 116 (void *)((unsigned long)(iomapp->iomap_bn)), 117 (void *)(__psint_t)(imapp->br_startoff), 118 (void *)((unsigned long)(imapp->br_blockcount)), 119 (void *)(__psint_t)(imapp->br_startblock)); 120} 121#else 122#define xfs_iomap_enter_trace(tag, io, offset, count) 123#define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags) 124#endif 125 126#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ 127 << mp->m_writeio_log) 128#define XFS_STRAT_WRITE_IMAPS 2 129#define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP 130 131STATIC int 132xfs_imap_to_bmap( 133 xfs_iocore_t *io, 134 xfs_off_t offset, 135 xfs_bmbt_irec_t *imap, 136 xfs_iomap_t *iomapp, 137 int imaps, /* Number of imap entries */ 138 int iomaps, /* Number of iomap entries */ 139 int flags) 140{ 141 xfs_mount_t *mp; 142 xfs_fsize_t nisize; 143 int pbm; 144 xfs_fsblock_t start_block; 145 146 mp = io->io_mount; 147 nisize = XFS_SIZE(mp, io); 148 if (io->io_new_size > nisize) 149 nisize = io->io_new_size; 150 151 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) { 152 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff); 153 iomapp->iomap_delta = offset - iomapp->iomap_offset; 154 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount); 155 iomapp->iomap_flags = flags; 156 157 if (io->io_flags & XFS_IOCORE_RT) { 158 iomapp->iomap_flags |= IOMAP_REALTIME; 159 iomapp->iomap_target = mp->m_rtdev_targp; 160 } else { 161 iomapp->iomap_target = mp->m_ddev_targp; 162 } 163 start_block = imap->br_startblock; 164 if (start_block == HOLESTARTBLOCK) { 165 iomapp->iomap_bn = IOMAP_DADDR_NULL; 166 iomapp->iomap_flags |= IOMAP_HOLE; 167 } else if (start_block == DELAYSTARTBLOCK) { 168 iomapp->iomap_bn = IOMAP_DADDR_NULL; 169 iomapp->iomap_flags |= IOMAP_DELAY; 170 } else { 171 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block); 172 if (ISUNWRITTEN(imap)) 173 iomapp->iomap_flags |= IOMAP_UNWRITTEN; 174 } 175 176 if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) { 177 iomapp->iomap_flags |= IOMAP_EOF; 178 } 179 180 offset += iomapp->iomap_bsize - iomapp->iomap_delta; 181 } 182 return pbm; /* Return the number filled */ 183} 184 185int 186xfs_iomap( 187 xfs_iocore_t *io, 188 xfs_off_t offset, 189 ssize_t count, 190 int flags, 191 xfs_iomap_t *iomapp, 192 int *niomaps) 193{ 194 xfs_mount_t *mp = io->io_mount; 195 xfs_fileoff_t offset_fsb, end_fsb; 196 int error = 0; 197 int lockmode = 0; 198 xfs_bmbt_irec_t imap; 199 int nimaps = 1; 200 int bmapi_flags = 0; 201 int iomap_flags = 0; 202 203 if (XFS_FORCED_SHUTDOWN(mp)) 204 return XFS_ERROR(EIO); 205 206 switch (flags & 207 (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE | 208 BMAPI_UNWRITTEN | BMAPI_DEVICE)) { 209 case BMAPI_READ: 210 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count); 211 lockmode = XFS_LCK_MAP_SHARED(mp, io); 212 bmapi_flags = XFS_BMAPI_ENTIRE; 213 break; 214 case BMAPI_WRITE: 215 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count); 216 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR; 217 if (flags & BMAPI_IGNSTATE) 218 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE; 219 XFS_ILOCK(mp, io, lockmode); 220 break; 221 case BMAPI_ALLOCATE: 222 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count); 223 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD; 224 bmapi_flags = XFS_BMAPI_ENTIRE; 225 /* Attempt non-blocking lock */ 226 if (flags & BMAPI_TRYLOCK) { 227 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode)) 228 return XFS_ERROR(EAGAIN); 229 } else { 230 XFS_ILOCK(mp, io, lockmode); 231 } 232 break; 233 case BMAPI_UNWRITTEN: 234 goto phase2; 235 case BMAPI_DEVICE: 236 lockmode = XFS_LCK_MAP_SHARED(mp, io); 237 iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ? 238 mp->m_rtdev_targp : mp->m_ddev_targp; 239 error = 0; 240 *niomaps = 1; 241 goto out; 242 default: 243 panic("unrecognized bmapi flags"); 244 } 245 246 ASSERT(offset <= mp->m_maxioffset); 247 if ((xfs_fsize_t)offset + count > mp->m_maxioffset) 248 count = mp->m_maxioffset - offset; 249 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); 250 offset_fsb = XFS_B_TO_FSBT(mp, offset); 251 252 error = XFS_BMAPI(mp, NULL, io, offset_fsb, 253 (xfs_filblks_t)(end_fsb - offset_fsb), 254 bmapi_flags, NULL, 0, &imap, 255 &nimaps, NULL, NULL); 256 257 if (error) 258 goto out; 259 260phase2: 261 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) { 262 case BMAPI_WRITE: 263 /* If we found an extent, return it */ 264 if (nimaps && 265 (imap.br_startblock != HOLESTARTBLOCK) && 266 (imap.br_startblock != DELAYSTARTBLOCK)) { 267 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 268 offset, count, iomapp, &imap, flags); 269 break; 270 } 271 272 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) { 273 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset, 274 count, flags, &imap, &nimaps, nimaps); 275 } else { 276 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, 277 flags, &imap, &nimaps); 278 } 279 if (!error) { 280 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io, 281 offset, count, iomapp, &imap, flags); 282 } 283 iomap_flags = IOMAP_NEW; 284 break; 285 case BMAPI_ALLOCATE: 286 /* If we found an extent, return it */ 287 XFS_IUNLOCK(mp, io, lockmode); 288 lockmode = 0; 289 290 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) { 291 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, 292 offset, count, iomapp, &imap, flags); 293 break; 294 } 295 296 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, 297 &imap, &nimaps); 298 break; 299 case BMAPI_UNWRITTEN: 300 lockmode = 0; 301 error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count); 302 nimaps = 0; 303 break; 304 } 305 306 if (nimaps) { 307 *niomaps = xfs_imap_to_bmap(io, offset, &imap, 308 iomapp, nimaps, *niomaps, iomap_flags); 309 } else if (niomaps) { 310 *niomaps = 0; 311 } 312 313out: 314 if (lockmode) 315 XFS_IUNLOCK(mp, io, lockmode); 316 return XFS_ERROR(error); 317} 318 319STATIC int 320xfs_iomap_eof_align_last_fsb( 321 xfs_mount_t *mp, 322 xfs_iocore_t *io, 323 xfs_fsize_t isize, 324 xfs_extlen_t extsize, 325 xfs_fileoff_t *last_fsb) 326{ 327 xfs_fileoff_t new_last_fsb = 0; 328 xfs_extlen_t align; 329 int eof, error; 330 331 if (io->io_flags & XFS_IOCORE_RT) 332 ; 333 /* 334 * If mounted with the "-o swalloc" option, roundup the allocation 335 * request to a stripe width boundary if the file size is >= 336 * stripe width and we are allocating past the allocation eof. 337 */ 338 else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && 339 (isize >= XFS_FSB_TO_B(mp, mp->m_swidth))) 340 new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); 341 /* 342 * Roundup the allocation request to a stripe unit (m_dalign) boundary 343 * if the file size is >= stripe unit size, and we are allocating past 344 * the allocation eof. 345 */ 346 else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign))) 347 new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); 348 349 /* 350 * Always round up the allocation request to an extent boundary 351 * (when file on a real-time subvolume or has di_extsize hint). 352 */ 353 if (extsize) { 354 if (new_last_fsb) 355 align = roundup_64(new_last_fsb, extsize); 356 else 357 align = extsize; 358 new_last_fsb = roundup_64(*last_fsb, align); 359 } 360 361 if (new_last_fsb) { 362 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof); 363 if (error) 364 return error; 365 if (eof) 366 *last_fsb = new_last_fsb; 367 } 368 return 0; 369} 370 371STATIC int 372xfs_flush_space( 373 xfs_inode_t *ip, 374 int *fsynced, 375 int *ioflags) 376{ 377 switch (*fsynced) { 378 case 0: 379 if (ip->i_delayed_blks) { 380 xfs_iunlock(ip, XFS_ILOCK_EXCL); 381 xfs_flush_inode(ip); 382 xfs_ilock(ip, XFS_ILOCK_EXCL); 383 *fsynced = 1; 384 } else { 385 *ioflags |= BMAPI_SYNC; 386 *fsynced = 2; 387 } 388 return 0; 389 case 1: 390 *fsynced = 2; 391 *ioflags |= BMAPI_SYNC; 392 return 0; 393 case 2: 394 xfs_iunlock(ip, XFS_ILOCK_EXCL); 395 xfs_flush_device(ip); 396 xfs_ilock(ip, XFS_ILOCK_EXCL); 397 *fsynced = 3; 398 return 0; 399 } 400 return 1; 401} 402 403int 404xfs_iomap_write_direct( 405 xfs_inode_t *ip, 406 xfs_off_t offset, 407 size_t count, 408 int flags, 409 xfs_bmbt_irec_t *ret_imap, 410 int *nmaps, 411 int found) 412{ 413 xfs_mount_t *mp = ip->i_mount; 414 xfs_iocore_t *io = &ip->i_iocore; 415 xfs_fileoff_t offset_fsb; 416 xfs_fileoff_t last_fsb; 417 xfs_filblks_t count_fsb, resaligned; 418 xfs_fsblock_t firstfsb; 419 xfs_extlen_t extsz, temp; 420 xfs_fsize_t isize; 421 int nimaps; 422 int bmapi_flag; 423 int quota_flag; 424 int rt; 425 xfs_trans_t *tp; 426 xfs_bmbt_irec_t imap; 427 xfs_bmap_free_t free_list; 428 uint qblocks, resblks, resrtextents; 429 int committed; 430 int error; 431 432 /* 433 * Make sure that the dquots are there. This doesn't hold 434 * the ilock across a disk read. 435 */ 436 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED); 437 if (error) 438 return XFS_ERROR(error); 439 440 rt = XFS_IS_REALTIME_INODE(ip); 441 if (unlikely(rt)) { 442 if (!(extsz = ip->i_d.di_extsize)) 443 extsz = mp->m_sb.sb_rextsize; 444 } else { 445 extsz = ip->i_d.di_extsize; 446 } 447 448 isize = ip->i_d.di_size; 449 if (io->io_new_size > isize) 450 isize = io->io_new_size; 451 452 offset_fsb = XFS_B_TO_FSBT(mp, offset); 453 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 454 if ((offset + count) > isize) { 455 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz, 456 &last_fsb); 457 if (error) 458 goto error_out; 459 } else { 460 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) 461 last_fsb = MIN(last_fsb, (xfs_fileoff_t) 462 ret_imap->br_blockcount + 463 ret_imap->br_startoff); 464 } 465 count_fsb = last_fsb - offset_fsb; 466 ASSERT(count_fsb > 0); 467 468 resaligned = count_fsb; 469 if (unlikely(extsz)) { 470 if ((temp = do_mod(offset_fsb, extsz))) 471 resaligned += temp; 472 if ((temp = do_mod(resaligned, extsz))) 473 resaligned += extsz - temp; 474 } 475 476 if (unlikely(rt)) { 477 resrtextents = qblocks = resaligned; 478 resrtextents /= mp->m_sb.sb_rextsize; 479 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); 480 quota_flag = XFS_QMOPT_RES_RTBLKS; 481 } else { 482 resrtextents = 0; 483 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); 484 quota_flag = XFS_QMOPT_RES_REGBLKS; 485 } 486 487 /* 488 * Allocate and setup the transaction 489 */ 490 xfs_iunlock(ip, XFS_ILOCK_EXCL); 491 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 492 error = xfs_trans_reserve(tp, resblks, 493 XFS_WRITE_LOG_RES(mp), resrtextents, 494 XFS_TRANS_PERM_LOG_RES, 495 XFS_WRITE_LOG_COUNT); 496 /* 497 * Check for running out of space, note: need lock to return 498 */ 499 if (error) 500 xfs_trans_cancel(tp, 0); 501 xfs_ilock(ip, XFS_ILOCK_EXCL); 502 if (error) 503 goto error_out; 504 505 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, 506 qblocks, 0, quota_flag); 507 if (error) 508 goto error1; 509 510 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 511 xfs_trans_ihold(tp, ip); 512 513 bmapi_flag = XFS_BMAPI_WRITE; 514 if ((flags & BMAPI_DIRECT) && (offset < ip->i_d.di_size || extsz)) 515 bmapi_flag |= XFS_BMAPI_PREALLOC; 516 517 /* 518 * Issue the xfs_bmapi() call to allocate the blocks 519 */ 520 XFS_BMAP_INIT(&free_list, &firstfsb); 521 nimaps = 1; 522 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, bmapi_flag, 523 &firstfsb, 0, &imap, &nimaps, &free_list, NULL); 524 if (error) 525 goto error0; 526 527 /* 528 * Complete the transaction 529 */ 530 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); 531 if (error) 532 goto error0; 533 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 534 if (error) 535 goto error_out; 536 537 /* 538 * Copy any maps to caller's array and return any error. 539 */ 540 if (nimaps == 0) { 541 error = (ENOSPC); 542 goto error_out; 543 } 544 545 *ret_imap = imap; 546 *nmaps = 1; 547 if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 548 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 549 "start_block : %llx start_off : %llx blkcnt : %llx " 550 "extent-state : %x \n", 551 (ip->i_mount)->m_fsname, 552 (long long)ip->i_ino, 553 (unsigned long long)ret_imap->br_startblock, 554 (unsigned long long)ret_imap->br_startoff, 555 (unsigned long long)ret_imap->br_blockcount, 556 ret_imap->br_state); 557 } 558 return 0; 559 560error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ 561 xfs_bmap_cancel(&free_list); 562 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag); 563 564error1: /* Just cancel transaction */ 565 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 566 *nmaps = 0; /* nothing set-up here */ 567 568error_out: 569 return XFS_ERROR(error); 570} 571 572/* 573 * If the caller is doing a write at the end of the file, 574 * then extend the allocation out to the file system's write 575 * iosize. We clean up any extra space left over when the 576 * file is closed in xfs_inactive(). 577 * 578 * For sync writes, we are flushing delayed allocate space to 579 * try to make additional space available for allocation near 580 * the filesystem full boundary - preallocation hurts in that 581 * situation, of course. 582 */ 583STATIC int 584xfs_iomap_eof_want_preallocate( 585 xfs_mount_t *mp, 586 xfs_iocore_t *io, 587 xfs_fsize_t isize, 588 xfs_off_t offset, 589 size_t count, 590 int ioflag, 591 xfs_bmbt_irec_t *imap, 592 int nimaps, 593 int *prealloc) 594{ 595 xfs_fileoff_t start_fsb; 596 xfs_filblks_t count_fsb; 597 xfs_fsblock_t firstblock; 598 int n, error, imaps; 599 600 *prealloc = 0; 601 if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize) 602 return 0; 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, ((xfs_ufsize_t)(offset + count - 1))); 609 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); 610 while (count_fsb > 0) { 611 imaps = nimaps; 612 firstblock = NULLFSBLOCK; 613 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 0, 614 &firstblock, 0, imap, &imaps, NULL, NULL); 615 if (error) 616 return error; 617 for (n = 0; n < imaps; n++) { 618 if ((imap[n].br_startblock != HOLESTARTBLOCK) && 619 (imap[n].br_startblock != DELAYSTARTBLOCK)) 620 return 0; 621 start_fsb += imap[n].br_blockcount; 622 count_fsb -= imap[n].br_blockcount; 623 } 624 } 625 *prealloc = 1; 626 return 0; 627} 628 629int 630xfs_iomap_write_delay( 631 xfs_inode_t *ip, 632 xfs_off_t offset, 633 size_t count, 634 int ioflag, 635 xfs_bmbt_irec_t *ret_imap, 636 int *nmaps) 637{ 638 xfs_mount_t *mp = ip->i_mount; 639 xfs_iocore_t *io = &ip->i_iocore; 640 xfs_fileoff_t offset_fsb; 641 xfs_fileoff_t last_fsb; 642 xfs_off_t aligned_offset; 643 xfs_fileoff_t ioalign; 644 xfs_fsblock_t firstblock; 645 xfs_extlen_t extsz; 646 xfs_fsize_t isize; 647 int nimaps; 648 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; 649 int prealloc, fsynced = 0; 650 int error; 651 652 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); 653 654 /* 655 * Make sure that the dquots are there. This doesn't hold 656 * the ilock across a disk read. 657 */ 658 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); 659 if (error) 660 return XFS_ERROR(error); 661 662 if (XFS_IS_REALTIME_INODE(ip)) { 663 if (!(extsz = ip->i_d.di_extsize)) 664 extsz = mp->m_sb.sb_rextsize; 665 } else { 666 extsz = ip->i_d.di_extsize; 667 } 668 669 offset_fsb = XFS_B_TO_FSBT(mp, offset); 670 671retry: 672 isize = ip->i_d.di_size; 673 if (io->io_new_size > isize) 674 isize = io->io_new_size; 675 676 error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count, 677 ioflag, imap, XFS_WRITE_IMAPS, &prealloc); 678 if (error) 679 return error; 680 681 if (prealloc) { 682 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); 683 ioalign = XFS_B_TO_FSBT(mp, aligned_offset); 684 last_fsb = ioalign + mp->m_writeio_blocks; 685 } else { 686 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); 687 } 688 689 if (prealloc || extsz) { 690 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz, 691 &last_fsb); 692 if (error) 693 return error; 694 } 695 696 nimaps = XFS_WRITE_IMAPS; 697 firstblock = NULLFSBLOCK; 698 error = XFS_BMAPI(mp, NULL, io, offset_fsb, 699 (xfs_filblks_t)(last_fsb - offset_fsb), 700 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | 701 XFS_BMAPI_ENTIRE, &firstblock, 1, imap, 702 &nimaps, NULL, NULL); 703 if (error && (error != ENOSPC)) 704 return XFS_ERROR(error); 705 706 /* 707 * If bmapi returned us nothing, and if we didn't get back EDQUOT, 708 * then we must have run out of space - flush delalloc, and retry.. 709 */ 710 if (nimaps == 0) { 711 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, 712 io, offset, count); 713 if (xfs_flush_space(ip, &fsynced, &ioflag)) 714 return XFS_ERROR(ENOSPC); 715 716 error = 0; 717 goto retry; 718 } 719 720 if (!(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) { 721 cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld " 722 "start_block : %llx start_off : %llx blkcnt : %llx " 723 "extent-state : %x \n", 724 (ip->i_mount)->m_fsname, 725 (long long)ip->i_ino, 726 (unsigned long long)ret_imap->br_startblock, 727 (unsigned long long)ret_imap->br_startoff, 728 (unsigned long long)ret_imap->br_blockcount, 729 ret_imap->br_state); 730 } 731 732 *ret_imap = imap[0]; 733 *nmaps = 1; 734 735 return 0; 736} 737 738/* 739 * Pass in a delayed allocate extent, convert it to real extents; 740 * return to the caller the extent we create which maps on top of 741 * the originating callers request. 742 * 743 * Called without a lock on the inode. 744 */ 745int 746xfs_iomap_write_allocate( 747 xfs_inode_t *ip, 748 xfs_off_t offset, 749 size_t count, 750 xfs_bmbt_irec_t *map, 751 int *retmap) 752{ 753 xfs_mount_t *mp = ip->i_mount; 754 xfs_iocore_t *io = &ip->i_iocore; 755 xfs_fileoff_t offset_fsb, last_block; 756 xfs_fileoff_t end_fsb, map_start_fsb; 757 xfs_fsblock_t first_block; 758 xfs_bmap_free_t free_list; 759 xfs_filblks_t count_fsb; 760 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; 761 xfs_trans_t *tp; 762 int i, nimaps, committed; 763 int error = 0; 764 int nres; 765 766 *retmap = 0; 767 768 /* 769 * Make sure that the dquots are there. 770 */ 771 if ((error = XFS_QM_DQATTACH(mp, ip, 0))) 772 return XFS_ERROR(error); 773 774 offset_fsb = XFS_B_TO_FSBT(mp, offset); 775 count_fsb = map->br_blockcount; 776 map_start_fsb = map->br_startoff; 777 778 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); 779 780 while (count_fsb != 0) { 781 /* 782 * Set up a transaction with which to allocate the 783 * backing store for the file. Do allocations in a 784 * loop until we get some space in the range we are 785 * interested in. The other space that might be allocated 786 * is in the delayed allocation extent on which we sit 787 * but before our buffer starts. 788 */ 789 790 nimaps = 0; 791 while (nimaps == 0) { 792 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); 793 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); 794 error = xfs_trans_reserve(tp, nres, 795 XFS_WRITE_LOG_RES(mp), 796 0, XFS_TRANS_PERM_LOG_RES, 797 XFS_WRITE_LOG_COUNT); 798 if (error == ENOSPC) { 799 error = xfs_trans_reserve(tp, 0, 800 XFS_WRITE_LOG_RES(mp), 801 0, 802 XFS_TRANS_PERM_LOG_RES, 803 XFS_WRITE_LOG_COUNT); 804 } 805 if (error) { 806 xfs_trans_cancel(tp, 0); 807 return XFS_ERROR(error); 808 } 809 xfs_ilock(ip, XFS_ILOCK_EXCL); 810 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 811 xfs_trans_ihold(tp, ip); 812 813 XFS_BMAP_INIT(&free_list, &first_block); 814 815 nimaps = XFS_STRAT_WRITE_IMAPS; 816 /* 817 * Ensure we don't go beyond eof - it is possible 818 * the extents changed since we did the read call, 819 * we dropped the ilock in the interim. 820 */ 821 822 end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size); 823 xfs_bmap_last_offset(NULL, ip, &last_block, 824 XFS_DATA_FORK); 825 last_block = XFS_FILEOFF_MAX(last_block, end_fsb); 826 if ((map_start_fsb + count_fsb) > last_block) { 827 count_fsb = last_block - map_start_fsb; 828 if (count_fsb == 0) { 829 error = EAGAIN; 830 goto trans_cancel; 831 } 832 } 833 834 /* Go get the actual blocks */ 835 error = XFS_BMAPI(mp, tp, io, map_start_fsb, count_fsb, 836 XFS_BMAPI_WRITE, &first_block, 1, 837 imap, &nimaps, &free_list, NULL); 838 if (error) 839 goto trans_cancel; 840 841 error = xfs_bmap_finish(&tp, &free_list, 842 first_block, &committed); 843 if (error) 844 goto trans_cancel; 845 846 error = xfs_trans_commit(tp, 847 XFS_TRANS_RELEASE_LOG_RES, NULL); 848 if (error) 849 goto error0; 850 851 xfs_iunlock(ip, XFS_ILOCK_EXCL); 852 } 853 854 /* 855 * See if we were able to allocate an extent that 856 * covers at least part of the callers request 857 */ 858 859 for (i = 0; i < nimaps; i++) { 860 if (!(io->io_flags & XFS_IOCORE_RT) && 861 !imap[i].br_startblock) { 862 cmn_err(CE_PANIC,"Access to block zero: " 863 "fs <%s> inode: %lld " 864 "start_block : %llx start_off : %llx " 865 "blkcnt : %llx extent-state : %x \n", 866 (ip->i_mount)->m_fsname, 867 (long long)ip->i_ino, 868 (unsigned long long) 869 imap[i].br_startblock, 870 (unsigned long long) 871 imap[i].br_startoff, 872 (unsigned long long) 873 imap[i].br_blockcount, 874 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 895trans_cancel: 896 xfs_bmap_cancel(&free_list); 897 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); 898error0: 899 xfs_iunlock(ip, XFS_ILOCK_EXCL); 900 return XFS_ERROR(error); 901} 902 903int 904xfs_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_fileoff_t offset_fsb; 912 xfs_filblks_t count_fsb; 913 xfs_filblks_t numblks_fsb; 914 xfs_fsblock_t firstfsb; 915 int nimaps; 916 xfs_trans_t *tp; 917 xfs_bmbt_irec_t imap; 918 xfs_bmap_free_t free_list; 919 uint resblks; 920 int committed; 921 int error; 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 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; 931 932 do { 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, resblks, 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(mp, tp, io, offset_fsb, count_fsb, 959 XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb, 960 1, &imap, &nimaps, &free_list, NULL); 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 (unsigned long long)imap.br_startblock, 981 (unsigned long long)imap.br_startoff, 982 (unsigned long long)imap.br_blockcount, 983 imap.br_state); 984 } 985 986 if ((numblks_fsb = imap.br_blockcount) == 0) { 987 /* 988 * The numblks_fsb value should always get 989 * smaller, otherwise the loop is stuck. 990 */ 991 ASSERT(imap.br_blockcount); 992 break; 993 } 994 offset_fsb += numblks_fsb; 995 count_fsb -= numblks_fsb; 996 } while (count_fsb > 0); 997 998 return 0; 999 1000error_on_bmapi_transaction: 1001 xfs_bmap_cancel(&free_list); 1002 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); 1003 xfs_iunlock(ip, XFS_ILOCK_EXCL); 1004error0: 1005 return XFS_ERROR(error); 1006} 1007