1 /* 2 * Copyright (c) 2000-2005 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_types.h" 21 #include "xfs_bit.h" 22 #include "xfs_log.h" 23 #include "xfs_inum.h" 24 #include "xfs_trans.h" 25 #include "xfs_sb.h" 26 #include "xfs_ag.h" 27 #include "xfs_dir2.h" 28 #include "xfs_dmapi.h" 29 #include "xfs_mount.h" 30 #include "xfs_error.h" 31 #include "xfs_log_priv.h" 32 #include "xfs_buf_item.h" 33 #include "xfs_bmap_btree.h" 34 #include "xfs_alloc_btree.h" 35 #include "xfs_ialloc_btree.h" 36 #include "xfs_log_recover.h" 37 #include "xfs_trans_priv.h" 38 #include "xfs_dir2_sf.h" 39 #include "xfs_attr_sf.h" 40 #include "xfs_dinode.h" 41 #include "xfs_inode.h" 42 #include "xfs_rw.h" 43 #include "xfs_trace.h" 44 45 kmem_zone_t *xfs_log_ticket_zone; 46 47 #define xlog_write_adv_cnt(ptr, len, off, bytes) \ 48 { (ptr) += (bytes); \ 49 (len) -= (bytes); \ 50 (off) += (bytes);} 51 52 /* Local miscellaneous function prototypes */ 53 STATIC int xlog_bdstrat_cb(struct xfs_buf *); 54 STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket, 55 xlog_in_core_t **, xfs_lsn_t *); 56 STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, 57 xfs_buftarg_t *log_target, 58 xfs_daddr_t blk_offset, 59 int num_bblks); 60 STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes); 61 STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); 62 STATIC void xlog_dealloc_log(xlog_t *log); 63 STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[], 64 int nentries, xfs_log_ticket_t tic, 65 xfs_lsn_t *start_lsn, 66 xlog_in_core_t **commit_iclog, 67 uint flags); 68 69 /* local state machine functions */ 70 STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); 71 STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); 72 STATIC int xlog_state_get_iclog_space(xlog_t *log, 73 int len, 74 xlog_in_core_t **iclog, 75 xlog_ticket_t *ticket, 76 int *continued_write, 77 int *logoffsetp); 78 STATIC int xlog_state_release_iclog(xlog_t *log, 79 xlog_in_core_t *iclog); 80 STATIC void xlog_state_switch_iclogs(xlog_t *log, 81 xlog_in_core_t *iclog, 82 int eventual_size); 83 STATIC int xlog_state_sync(xlog_t *log, 84 xfs_lsn_t lsn, 85 uint flags, 86 int *log_flushed); 87 STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed); 88 STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); 89 90 /* local functions to manipulate grant head */ 91 STATIC int xlog_grant_log_space(xlog_t *log, 92 xlog_ticket_t *xtic); 93 STATIC void xlog_grant_push_ail(xfs_mount_t *mp, 94 int need_bytes); 95 STATIC void xlog_regrant_reserve_log_space(xlog_t *log, 96 xlog_ticket_t *ticket); 97 STATIC int xlog_regrant_write_log_space(xlog_t *log, 98 xlog_ticket_t *ticket); 99 STATIC void xlog_ungrant_log_space(xlog_t *log, 100 xlog_ticket_t *ticket); 101 102 103 /* local ticket functions */ 104 STATIC xlog_ticket_t *xlog_ticket_alloc(xlog_t *log, 105 int unit_bytes, 106 int count, 107 char clientid, 108 uint flags); 109 110 #if defined(DEBUG) 111 STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); 112 STATIC void xlog_verify_grant_head(xlog_t *log, int equals); 113 STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, 114 int count, boolean_t syncing); 115 STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, 116 xfs_lsn_t tail_lsn); 117 #else 118 #define xlog_verify_dest_ptr(a,b) 119 #define xlog_verify_grant_head(a,b) 120 #define xlog_verify_iclog(a,b,c,d) 121 #define xlog_verify_tail_lsn(a,b,c) 122 #endif 123 124 STATIC int xlog_iclogs_empty(xlog_t *log); 125 126 127 static void 128 xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) 129 { 130 if (*qp) { 131 tic->t_next = (*qp); 132 tic->t_prev = (*qp)->t_prev; 133 (*qp)->t_prev->t_next = tic; 134 (*qp)->t_prev = tic; 135 } else { 136 tic->t_prev = tic->t_next = tic; 137 *qp = tic; 138 } 139 140 tic->t_flags |= XLOG_TIC_IN_Q; 141 } 142 143 static void 144 xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) 145 { 146 if (tic == tic->t_next) { 147 *qp = NULL; 148 } else { 149 *qp = tic->t_next; 150 tic->t_next->t_prev = tic->t_prev; 151 tic->t_prev->t_next = tic->t_next; 152 } 153 154 tic->t_next = tic->t_prev = NULL; 155 tic->t_flags &= ~XLOG_TIC_IN_Q; 156 } 157 158 static void 159 xlog_grant_sub_space(struct log *log, int bytes) 160 { 161 log->l_grant_write_bytes -= bytes; 162 if (log->l_grant_write_bytes < 0) { 163 log->l_grant_write_bytes += log->l_logsize; 164 log->l_grant_write_cycle--; 165 } 166 167 log->l_grant_reserve_bytes -= bytes; 168 if ((log)->l_grant_reserve_bytes < 0) { 169 log->l_grant_reserve_bytes += log->l_logsize; 170 log->l_grant_reserve_cycle--; 171 } 172 173 } 174 175 static void 176 xlog_grant_add_space_write(struct log *log, int bytes) 177 { 178 int tmp = log->l_logsize - log->l_grant_write_bytes; 179 if (tmp > bytes) 180 log->l_grant_write_bytes += bytes; 181 else { 182 log->l_grant_write_cycle++; 183 log->l_grant_write_bytes = bytes - tmp; 184 } 185 } 186 187 static void 188 xlog_grant_add_space_reserve(struct log *log, int bytes) 189 { 190 int tmp = log->l_logsize - log->l_grant_reserve_bytes; 191 if (tmp > bytes) 192 log->l_grant_reserve_bytes += bytes; 193 else { 194 log->l_grant_reserve_cycle++; 195 log->l_grant_reserve_bytes = bytes - tmp; 196 } 197 } 198 199 static inline void 200 xlog_grant_add_space(struct log *log, int bytes) 201 { 202 xlog_grant_add_space_write(log, bytes); 203 xlog_grant_add_space_reserve(log, bytes); 204 } 205 206 static void 207 xlog_tic_reset_res(xlog_ticket_t *tic) 208 { 209 tic->t_res_num = 0; 210 tic->t_res_arr_sum = 0; 211 tic->t_res_num_ophdrs = 0; 212 } 213 214 static void 215 xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) 216 { 217 if (tic->t_res_num == XLOG_TIC_LEN_MAX) { 218 /* add to overflow and start again */ 219 tic->t_res_o_flow += tic->t_res_arr_sum; 220 tic->t_res_num = 0; 221 tic->t_res_arr_sum = 0; 222 } 223 224 tic->t_res_arr[tic->t_res_num].r_len = len; 225 tic->t_res_arr[tic->t_res_num].r_type = type; 226 tic->t_res_arr_sum += len; 227 tic->t_res_num++; 228 } 229 230 /* 231 * NOTES: 232 * 233 * 1. currblock field gets updated at startup and after in-core logs 234 * marked as with WANT_SYNC. 235 */ 236 237 /* 238 * This routine is called when a user of a log manager ticket is done with 239 * the reservation. If the ticket was ever used, then a commit record for 240 * the associated transaction is written out as a log operation header with 241 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with 242 * a given ticket. If the ticket was one with a permanent reservation, then 243 * a few operations are done differently. Permanent reservation tickets by 244 * default don't release the reservation. They just commit the current 245 * transaction with the belief that the reservation is still needed. A flag 246 * must be passed in before permanent reservations are actually released. 247 * When these type of tickets are not released, they need to be set into 248 * the inited state again. By doing this, a start record will be written 249 * out when the next write occurs. 250 */ 251 xfs_lsn_t 252 xfs_log_done(xfs_mount_t *mp, 253 xfs_log_ticket_t xtic, 254 void **iclog, 255 uint flags) 256 { 257 xlog_t *log = mp->m_log; 258 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; 259 xfs_lsn_t lsn = 0; 260 261 if (XLOG_FORCED_SHUTDOWN(log) || 262 /* 263 * If nothing was ever written, don't write out commit record. 264 * If we get an error, just continue and give back the log ticket. 265 */ 266 (((ticket->t_flags & XLOG_TIC_INITED) == 0) && 267 (xlog_commit_record(mp, ticket, 268 (xlog_in_core_t **)iclog, &lsn)))) { 269 lsn = (xfs_lsn_t) -1; 270 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { 271 flags |= XFS_LOG_REL_PERM_RESERV; 272 } 273 } 274 275 276 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || 277 (flags & XFS_LOG_REL_PERM_RESERV)) { 278 trace_xfs_log_done_nonperm(log, ticket); 279 280 /* 281 * Release ticket if not permanent reservation or a specific 282 * request has been made to release a permanent reservation. 283 */ 284 xlog_ungrant_log_space(log, ticket); 285 xfs_log_ticket_put(ticket); 286 } else { 287 trace_xfs_log_done_perm(log, ticket); 288 289 xlog_regrant_reserve_log_space(log, ticket); 290 /* If this ticket was a permanent reservation and we aren't 291 * trying to release it, reset the inited flags; so next time 292 * we write, a start record will be written out. 293 */ 294 ticket->t_flags |= XLOG_TIC_INITED; 295 } 296 297 return lsn; 298 } /* xfs_log_done */ 299 300 301 /* 302 * Force the in-core log to disk. If flags == XFS_LOG_SYNC, 303 * the force is done synchronously. 304 * 305 * Asynchronous forces are implemented by setting the WANT_SYNC 306 * bit in the appropriate in-core log and then returning. 307 * 308 * Synchronous forces are implemented with a signal variable. All callers 309 * to force a given lsn to disk will wait on a the sv attached to the 310 * specific in-core log. When given in-core log finally completes its 311 * write to disk, that thread will wake up all threads waiting on the 312 * sv. 313 */ 314 int 315 _xfs_log_force( 316 xfs_mount_t *mp, 317 xfs_lsn_t lsn, 318 uint flags, 319 int *log_flushed) 320 { 321 xlog_t *log = mp->m_log; 322 int dummy; 323 324 if (!log_flushed) 325 log_flushed = &dummy; 326 327 ASSERT(flags & XFS_LOG_FORCE); 328 329 XFS_STATS_INC(xs_log_force); 330 331 if (log->l_flags & XLOG_IO_ERROR) 332 return XFS_ERROR(EIO); 333 if (lsn == 0) 334 return xlog_state_sync_all(log, flags, log_flushed); 335 else 336 return xlog_state_sync(log, lsn, flags, log_flushed); 337 } /* _xfs_log_force */ 338 339 /* 340 * Wrapper for _xfs_log_force(), to be used when caller doesn't care 341 * about errors or whether the log was flushed or not. This is the normal 342 * interface to use when trying to unpin items or move the log forward. 343 */ 344 void 345 xfs_log_force( 346 xfs_mount_t *mp, 347 xfs_lsn_t lsn, 348 uint flags) 349 { 350 int error; 351 error = _xfs_log_force(mp, lsn, flags, NULL); 352 if (error) { 353 xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: " 354 "error %d returned.", error); 355 } 356 } 357 358 359 /* 360 * Attaches a new iclog I/O completion callback routine during 361 * transaction commit. If the log is in error state, a non-zero 362 * return code is handed back and the caller is responsible for 363 * executing the callback at an appropriate time. 364 */ 365 int 366 xfs_log_notify(xfs_mount_t *mp, /* mount of partition */ 367 void *iclog_hndl, /* iclog to hang callback off */ 368 xfs_log_callback_t *cb) 369 { 370 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 371 int abortflg; 372 373 spin_lock(&iclog->ic_callback_lock); 374 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); 375 if (!abortflg) { 376 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || 377 (iclog->ic_state == XLOG_STATE_WANT_SYNC)); 378 cb->cb_next = NULL; 379 *(iclog->ic_callback_tail) = cb; 380 iclog->ic_callback_tail = &(cb->cb_next); 381 } 382 spin_unlock(&iclog->ic_callback_lock); 383 return abortflg; 384 } /* xfs_log_notify */ 385 386 int 387 xfs_log_release_iclog(xfs_mount_t *mp, 388 void *iclog_hndl) 389 { 390 xlog_t *log = mp->m_log; 391 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 392 393 if (xlog_state_release_iclog(log, iclog)) { 394 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 395 return EIO; 396 } 397 398 return 0; 399 } 400 401 /* 402 * 1. Reserve an amount of on-disk log space and return a ticket corresponding 403 * to the reservation. 404 * 2. Potentially, push buffers at tail of log to disk. 405 * 406 * Each reservation is going to reserve extra space for a log record header. 407 * When writes happen to the on-disk log, we don't subtract the length of the 408 * log record header from any reservation. By wasting space in each 409 * reservation, we prevent over allocation problems. 410 */ 411 int 412 xfs_log_reserve(xfs_mount_t *mp, 413 int unit_bytes, 414 int cnt, 415 xfs_log_ticket_t *ticket, 416 __uint8_t client, 417 uint flags, 418 uint t_type) 419 { 420 xlog_t *log = mp->m_log; 421 xlog_ticket_t *internal_ticket; 422 int retval = 0; 423 424 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); 425 ASSERT((flags & XFS_LOG_NOSLEEP) == 0); 426 427 if (XLOG_FORCED_SHUTDOWN(log)) 428 return XFS_ERROR(EIO); 429 430 XFS_STATS_INC(xs_try_logspace); 431 432 433 if (*ticket != NULL) { 434 ASSERT(flags & XFS_LOG_PERM_RESERV); 435 internal_ticket = (xlog_ticket_t *)*ticket; 436 437 trace_xfs_log_reserve(log, internal_ticket); 438 439 xlog_grant_push_ail(mp, internal_ticket->t_unit_res); 440 retval = xlog_regrant_write_log_space(log, internal_ticket); 441 } else { 442 /* may sleep if need to allocate more tickets */ 443 internal_ticket = xlog_ticket_alloc(log, unit_bytes, cnt, 444 client, flags); 445 if (!internal_ticket) 446 return XFS_ERROR(ENOMEM); 447 internal_ticket->t_trans_type = t_type; 448 *ticket = internal_ticket; 449 450 trace_xfs_log_reserve(log, internal_ticket); 451 452 xlog_grant_push_ail(mp, 453 (internal_ticket->t_unit_res * 454 internal_ticket->t_cnt)); 455 retval = xlog_grant_log_space(log, internal_ticket); 456 } 457 458 return retval; 459 } /* xfs_log_reserve */ 460 461 462 /* 463 * Mount a log filesystem 464 * 465 * mp - ubiquitous xfs mount point structure 466 * log_target - buftarg of on-disk log device 467 * blk_offset - Start block # where block size is 512 bytes (BBSIZE) 468 * num_bblocks - Number of BBSIZE blocks in on-disk log 469 * 470 * Return error or zero. 471 */ 472 int 473 xfs_log_mount( 474 xfs_mount_t *mp, 475 xfs_buftarg_t *log_target, 476 xfs_daddr_t blk_offset, 477 int num_bblks) 478 { 479 int error; 480 481 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 482 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); 483 else { 484 cmn_err(CE_NOTE, 485 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", 486 mp->m_fsname); 487 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); 488 } 489 490 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); 491 if (IS_ERR(mp->m_log)) { 492 error = -PTR_ERR(mp->m_log); 493 goto out; 494 } 495 496 /* 497 * Initialize the AIL now we have a log. 498 */ 499 error = xfs_trans_ail_init(mp); 500 if (error) { 501 cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error); 502 goto out_free_log; 503 } 504 mp->m_log->l_ailp = mp->m_ail; 505 506 /* 507 * skip log recovery on a norecovery mount. pretend it all 508 * just worked. 509 */ 510 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { 511 int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); 512 513 if (readonly) 514 mp->m_flags &= ~XFS_MOUNT_RDONLY; 515 516 error = xlog_recover(mp->m_log); 517 518 if (readonly) 519 mp->m_flags |= XFS_MOUNT_RDONLY; 520 if (error) { 521 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); 522 goto out_destroy_ail; 523 } 524 } 525 526 /* Normal transactions can now occur */ 527 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; 528 529 return 0; 530 531 out_destroy_ail: 532 xfs_trans_ail_destroy(mp); 533 out_free_log: 534 xlog_dealloc_log(mp->m_log); 535 out: 536 return error; 537 } 538 539 /* 540 * Finish the recovery of the file system. This is separate from 541 * the xfs_log_mount() call, because it depends on the code in 542 * xfs_mountfs() to read in the root and real-time bitmap inodes 543 * between calling xfs_log_mount() and here. 544 * 545 * mp - ubiquitous xfs mount point structure 546 */ 547 int 548 xfs_log_mount_finish(xfs_mount_t *mp) 549 { 550 int error; 551 552 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 553 error = xlog_recover_finish(mp->m_log); 554 else { 555 error = 0; 556 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); 557 } 558 559 return error; 560 } 561 562 /* 563 * Final log writes as part of unmount. 564 * 565 * Mark the filesystem clean as unmount happens. Note that during relocation 566 * this routine needs to be executed as part of source-bag while the 567 * deallocation must not be done until source-end. 568 */ 569 570 /* 571 * Unmount record used to have a string "Unmount filesystem--" in the 572 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). 573 * We just write the magic number now since that particular field isn't 574 * currently architecture converted and "nUmount" is a bit foo. 575 * As far as I know, there weren't any dependencies on the old behaviour. 576 */ 577 578 int 579 xfs_log_unmount_write(xfs_mount_t *mp) 580 { 581 xlog_t *log = mp->m_log; 582 xlog_in_core_t *iclog; 583 #ifdef DEBUG 584 xlog_in_core_t *first_iclog; 585 #endif 586 xfs_log_iovec_t reg[1]; 587 xfs_log_ticket_t tic = NULL; 588 xfs_lsn_t lsn; 589 int error; 590 591 /* the data section must be 32 bit size aligned */ 592 struct { 593 __uint16_t magic; 594 __uint16_t pad1; 595 __uint32_t pad2; /* may as well make it 64 bits */ 596 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; 597 598 /* 599 * Don't write out unmount record on read-only mounts. 600 * Or, if we are doing a forced umount (typically because of IO errors). 601 */ 602 if (mp->m_flags & XFS_MOUNT_RDONLY) 603 return 0; 604 605 error = _xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC, NULL); 606 ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); 607 608 #ifdef DEBUG 609 first_iclog = iclog = log->l_iclog; 610 do { 611 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 612 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); 613 ASSERT(iclog->ic_offset == 0); 614 } 615 iclog = iclog->ic_next; 616 } while (iclog != first_iclog); 617 #endif 618 if (! (XLOG_FORCED_SHUTDOWN(log))) { 619 reg[0].i_addr = (void*)&magic; 620 reg[0].i_len = sizeof(magic); 621 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT); 622 623 error = xfs_log_reserve(mp, 600, 1, &tic, 624 XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); 625 if (!error) { 626 /* remove inited flag */ 627 ((xlog_ticket_t *)tic)->t_flags = 0; 628 error = xlog_write(mp, reg, 1, tic, &lsn, 629 NULL, XLOG_UNMOUNT_TRANS); 630 /* 631 * At this point, we're umounting anyway, 632 * so there's no point in transitioning log state 633 * to IOERROR. Just continue... 634 */ 635 } 636 637 if (error) { 638 xfs_fs_cmn_err(CE_ALERT, mp, 639 "xfs_log_unmount: unmount record failed"); 640 } 641 642 643 spin_lock(&log->l_icloglock); 644 iclog = log->l_iclog; 645 atomic_inc(&iclog->ic_refcnt); 646 xlog_state_want_sync(log, iclog); 647 spin_unlock(&log->l_icloglock); 648 error = xlog_state_release_iclog(log, iclog); 649 650 spin_lock(&log->l_icloglock); 651 if (!(iclog->ic_state == XLOG_STATE_ACTIVE || 652 iclog->ic_state == XLOG_STATE_DIRTY)) { 653 if (!XLOG_FORCED_SHUTDOWN(log)) { 654 sv_wait(&iclog->ic_force_wait, PMEM, 655 &log->l_icloglock, s); 656 } else { 657 spin_unlock(&log->l_icloglock); 658 } 659 } else { 660 spin_unlock(&log->l_icloglock); 661 } 662 if (tic) { 663 trace_xfs_log_umount_write(log, tic); 664 xlog_ungrant_log_space(log, tic); 665 xfs_log_ticket_put(tic); 666 } 667 } else { 668 /* 669 * We're already in forced_shutdown mode, couldn't 670 * even attempt to write out the unmount transaction. 671 * 672 * Go through the motions of sync'ing and releasing 673 * the iclog, even though no I/O will actually happen, 674 * we need to wait for other log I/Os that may already 675 * be in progress. Do this as a separate section of 676 * code so we'll know if we ever get stuck here that 677 * we're in this odd situation of trying to unmount 678 * a file system that went into forced_shutdown as 679 * the result of an unmount.. 680 */ 681 spin_lock(&log->l_icloglock); 682 iclog = log->l_iclog; 683 atomic_inc(&iclog->ic_refcnt); 684 685 xlog_state_want_sync(log, iclog); 686 spin_unlock(&log->l_icloglock); 687 error = xlog_state_release_iclog(log, iclog); 688 689 spin_lock(&log->l_icloglock); 690 691 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE 692 || iclog->ic_state == XLOG_STATE_DIRTY 693 || iclog->ic_state == XLOG_STATE_IOERROR) ) { 694 695 sv_wait(&iclog->ic_force_wait, PMEM, 696 &log->l_icloglock, s); 697 } else { 698 spin_unlock(&log->l_icloglock); 699 } 700 } 701 702 return error; 703 } /* xfs_log_unmount_write */ 704 705 /* 706 * Deallocate log structures for unmount/relocation. 707 * 708 * We need to stop the aild from running before we destroy 709 * and deallocate the log as the aild references the log. 710 */ 711 void 712 xfs_log_unmount(xfs_mount_t *mp) 713 { 714 xfs_trans_ail_destroy(mp); 715 xlog_dealloc_log(mp->m_log); 716 } 717 718 /* 719 * Write region vectors to log. The write happens using the space reservation 720 * of the ticket (tic). It is not a requirement that all writes for a given 721 * transaction occur with one call to xfs_log_write(). 722 */ 723 int 724 xfs_log_write(xfs_mount_t * mp, 725 xfs_log_iovec_t reg[], 726 int nentries, 727 xfs_log_ticket_t tic, 728 xfs_lsn_t *start_lsn) 729 { 730 int error; 731 xlog_t *log = mp->m_log; 732 733 if (XLOG_FORCED_SHUTDOWN(log)) 734 return XFS_ERROR(EIO); 735 736 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { 737 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 738 } 739 return error; 740 } /* xfs_log_write */ 741 742 743 void 744 xfs_log_move_tail(xfs_mount_t *mp, 745 xfs_lsn_t tail_lsn) 746 { 747 xlog_ticket_t *tic; 748 xlog_t *log = mp->m_log; 749 int need_bytes, free_bytes, cycle, bytes; 750 751 if (XLOG_FORCED_SHUTDOWN(log)) 752 return; 753 754 if (tail_lsn == 0) { 755 /* needed since sync_lsn is 64 bits */ 756 spin_lock(&log->l_icloglock); 757 tail_lsn = log->l_last_sync_lsn; 758 spin_unlock(&log->l_icloglock); 759 } 760 761 spin_lock(&log->l_grant_lock); 762 763 /* Also an invalid lsn. 1 implies that we aren't passing in a valid 764 * tail_lsn. 765 */ 766 if (tail_lsn != 1) { 767 log->l_tail_lsn = tail_lsn; 768 } 769 770 if ((tic = log->l_write_headq)) { 771 #ifdef DEBUG 772 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 773 panic("Recovery problem"); 774 #endif 775 cycle = log->l_grant_write_cycle; 776 bytes = log->l_grant_write_bytes; 777 free_bytes = xlog_space_left(log, cycle, bytes); 778 do { 779 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); 780 781 if (free_bytes < tic->t_unit_res && tail_lsn != 1) 782 break; 783 tail_lsn = 0; 784 free_bytes -= tic->t_unit_res; 785 sv_signal(&tic->t_wait); 786 tic = tic->t_next; 787 } while (tic != log->l_write_headq); 788 } 789 if ((tic = log->l_reserve_headq)) { 790 #ifdef DEBUG 791 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 792 panic("Recovery problem"); 793 #endif 794 cycle = log->l_grant_reserve_cycle; 795 bytes = log->l_grant_reserve_bytes; 796 free_bytes = xlog_space_left(log, cycle, bytes); 797 do { 798 if (tic->t_flags & XLOG_TIC_PERM_RESERV) 799 need_bytes = tic->t_unit_res*tic->t_cnt; 800 else 801 need_bytes = tic->t_unit_res; 802 if (free_bytes < need_bytes && tail_lsn != 1) 803 break; 804 tail_lsn = 0; 805 free_bytes -= need_bytes; 806 sv_signal(&tic->t_wait); 807 tic = tic->t_next; 808 } while (tic != log->l_reserve_headq); 809 } 810 spin_unlock(&log->l_grant_lock); 811 } /* xfs_log_move_tail */ 812 813 /* 814 * Determine if we have a transaction that has gone to disk 815 * that needs to be covered. Log activity needs to be idle (no AIL and 816 * nothing in the iclogs). And, we need to be in the right state indicating 817 * something has gone out. 818 */ 819 int 820 xfs_log_need_covered(xfs_mount_t *mp) 821 { 822 int needed = 0; 823 xlog_t *log = mp->m_log; 824 825 if (!xfs_fs_writable(mp)) 826 return 0; 827 828 spin_lock(&log->l_icloglock); 829 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || 830 (log->l_covered_state == XLOG_STATE_COVER_NEED2)) 831 && !xfs_trans_ail_tail(log->l_ailp) 832 && xlog_iclogs_empty(log)) { 833 if (log->l_covered_state == XLOG_STATE_COVER_NEED) 834 log->l_covered_state = XLOG_STATE_COVER_DONE; 835 else { 836 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); 837 log->l_covered_state = XLOG_STATE_COVER_DONE2; 838 } 839 needed = 1; 840 } 841 spin_unlock(&log->l_icloglock); 842 return needed; 843 } 844 845 /****************************************************************************** 846 * 847 * local routines 848 * 849 ****************************************************************************** 850 */ 851 852 /* xfs_trans_tail_ail returns 0 when there is nothing in the list. 853 * The log manager must keep track of the last LR which was committed 854 * to disk. The lsn of this LR will become the new tail_lsn whenever 855 * xfs_trans_tail_ail returns 0. If we don't do this, we run into 856 * the situation where stuff could be written into the log but nothing 857 * was ever in the AIL when asked. Eventually, we panic since the 858 * tail hits the head. 859 * 860 * We may be holding the log iclog lock upon entering this routine. 861 */ 862 xfs_lsn_t 863 xlog_assign_tail_lsn(xfs_mount_t *mp) 864 { 865 xfs_lsn_t tail_lsn; 866 xlog_t *log = mp->m_log; 867 868 tail_lsn = xfs_trans_ail_tail(mp->m_ail); 869 spin_lock(&log->l_grant_lock); 870 if (tail_lsn != 0) { 871 log->l_tail_lsn = tail_lsn; 872 } else { 873 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; 874 } 875 spin_unlock(&log->l_grant_lock); 876 877 return tail_lsn; 878 } /* xlog_assign_tail_lsn */ 879 880 881 /* 882 * Return the space in the log between the tail and the head. The head 883 * is passed in the cycle/bytes formal parms. In the special case where 884 * the reserve head has wrapped passed the tail, this calculation is no 885 * longer valid. In this case, just return 0 which means there is no space 886 * in the log. This works for all places where this function is called 887 * with the reserve head. Of course, if the write head were to ever 888 * wrap the tail, we should blow up. Rather than catch this case here, 889 * we depend on other ASSERTions in other parts of the code. XXXmiken 890 * 891 * This code also handles the case where the reservation head is behind 892 * the tail. The details of this case are described below, but the end 893 * result is that we return the size of the log as the amount of space left. 894 */ 895 STATIC int 896 xlog_space_left(xlog_t *log, int cycle, int bytes) 897 { 898 int free_bytes; 899 int tail_bytes; 900 int tail_cycle; 901 902 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); 903 tail_cycle = CYCLE_LSN(log->l_tail_lsn); 904 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { 905 free_bytes = log->l_logsize - (bytes - tail_bytes); 906 } else if ((tail_cycle + 1) < cycle) { 907 return 0; 908 } else if (tail_cycle < cycle) { 909 ASSERT(tail_cycle == (cycle - 1)); 910 free_bytes = tail_bytes - bytes; 911 } else { 912 /* 913 * The reservation head is behind the tail. 914 * In this case we just want to return the size of the 915 * log as the amount of space left. 916 */ 917 xfs_fs_cmn_err(CE_ALERT, log->l_mp, 918 "xlog_space_left: head behind tail\n" 919 " tail_cycle = %d, tail_bytes = %d\n" 920 " GH cycle = %d, GH bytes = %d", 921 tail_cycle, tail_bytes, cycle, bytes); 922 ASSERT(0); 923 free_bytes = log->l_logsize; 924 } 925 return free_bytes; 926 } /* xlog_space_left */ 927 928 929 /* 930 * Log function which is called when an io completes. 931 * 932 * The log manager needs its own routine, in order to control what 933 * happens with the buffer after the write completes. 934 */ 935 void 936 xlog_iodone(xfs_buf_t *bp) 937 { 938 xlog_in_core_t *iclog; 939 xlog_t *l; 940 int aborted; 941 942 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 943 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); 944 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 945 aborted = 0; 946 l = iclog->ic_log; 947 948 /* 949 * If the _XFS_BARRIER_FAILED flag was set by a lower 950 * layer, it means the underlying device no longer supports 951 * barrier I/O. Warn loudly and turn off barriers. 952 */ 953 if (bp->b_flags & _XFS_BARRIER_FAILED) { 954 bp->b_flags &= ~_XFS_BARRIER_FAILED; 955 l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER; 956 xfs_fs_cmn_err(CE_WARN, l->l_mp, 957 "xlog_iodone: Barriers are no longer supported" 958 " by device. Disabling barriers\n"); 959 } 960 961 /* 962 * Race to shutdown the filesystem if we see an error. 963 */ 964 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, 965 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { 966 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); 967 XFS_BUF_STALE(bp); 968 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); 969 /* 970 * This flag will be propagated to the trans-committed 971 * callback routines to let them know that the log-commit 972 * didn't succeed. 973 */ 974 aborted = XFS_LI_ABORTED; 975 } else if (iclog->ic_state & XLOG_STATE_IOERROR) { 976 aborted = XFS_LI_ABORTED; 977 } 978 979 /* log I/O is always issued ASYNC */ 980 ASSERT(XFS_BUF_ISASYNC(bp)); 981 xlog_state_done_syncing(iclog, aborted); 982 /* 983 * do not reference the buffer (bp) here as we could race 984 * with it being freed after writing the unmount record to the 985 * log. 986 */ 987 988 } /* xlog_iodone */ 989 990 /* 991 * The bdstrat callback function for log bufs. This gives us a central 992 * place to trap bufs in case we get hit by a log I/O error and need to 993 * shutdown. Actually, in practice, even when we didn't get a log error, 994 * we transition the iclogs to IOERROR state *after* flushing all existing 995 * iclogs to disk. This is because we don't want anymore new transactions to be 996 * started or completed afterwards. 997 */ 998 STATIC int 999 xlog_bdstrat_cb(struct xfs_buf *bp) 1000 { 1001 xlog_in_core_t *iclog; 1002 1003 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 1004 1005 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { 1006 /* note for irix bstrat will need struct bdevsw passed 1007 * Fix the following macro if the code ever is merged 1008 */ 1009 XFS_bdstrat(bp); 1010 return 0; 1011 } 1012 1013 XFS_BUF_ERROR(bp, EIO); 1014 XFS_BUF_STALE(bp); 1015 xfs_biodone(bp); 1016 return XFS_ERROR(EIO); 1017 } 1018 1019 /* 1020 * Return size of each in-core log record buffer. 1021 * 1022 * All machines get 8 x 32kB buffers by default, unless tuned otherwise. 1023 * 1024 * If the filesystem blocksize is too large, we may need to choose a 1025 * larger size since the directory code currently logs entire blocks. 1026 */ 1027 1028 STATIC void 1029 xlog_get_iclog_buffer_size(xfs_mount_t *mp, 1030 xlog_t *log) 1031 { 1032 int size; 1033 int xhdrs; 1034 1035 if (mp->m_logbufs <= 0) 1036 log->l_iclog_bufs = XLOG_MAX_ICLOGS; 1037 else 1038 log->l_iclog_bufs = mp->m_logbufs; 1039 1040 /* 1041 * Buffer size passed in from mount system call. 1042 */ 1043 if (mp->m_logbsize > 0) { 1044 size = log->l_iclog_size = mp->m_logbsize; 1045 log->l_iclog_size_log = 0; 1046 while (size != 1) { 1047 log->l_iclog_size_log++; 1048 size >>= 1; 1049 } 1050 1051 if (xfs_sb_version_haslogv2(&mp->m_sb)) { 1052 /* # headers = size / 32k 1053 * one header holds cycles from 32k of data 1054 */ 1055 1056 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; 1057 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) 1058 xhdrs++; 1059 log->l_iclog_hsize = xhdrs << BBSHIFT; 1060 log->l_iclog_heads = xhdrs; 1061 } else { 1062 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); 1063 log->l_iclog_hsize = BBSIZE; 1064 log->l_iclog_heads = 1; 1065 } 1066 goto done; 1067 } 1068 1069 /* All machines use 32kB buffers by default. */ 1070 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; 1071 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1072 1073 /* the default log size is 16k or 32k which is one header sector */ 1074 log->l_iclog_hsize = BBSIZE; 1075 log->l_iclog_heads = 1; 1076 1077 done: 1078 /* are we being asked to make the sizes selected above visible? */ 1079 if (mp->m_logbufs == 0) 1080 mp->m_logbufs = log->l_iclog_bufs; 1081 if (mp->m_logbsize == 0) 1082 mp->m_logbsize = log->l_iclog_size; 1083 } /* xlog_get_iclog_buffer_size */ 1084 1085 1086 /* 1087 * This routine initializes some of the log structure for a given mount point. 1088 * Its primary purpose is to fill in enough, so recovery can occur. However, 1089 * some other stuff may be filled in too. 1090 */ 1091 STATIC xlog_t * 1092 xlog_alloc_log(xfs_mount_t *mp, 1093 xfs_buftarg_t *log_target, 1094 xfs_daddr_t blk_offset, 1095 int num_bblks) 1096 { 1097 xlog_t *log; 1098 xlog_rec_header_t *head; 1099 xlog_in_core_t **iclogp; 1100 xlog_in_core_t *iclog, *prev_iclog=NULL; 1101 xfs_buf_t *bp; 1102 int i; 1103 int iclogsize; 1104 int error = ENOMEM; 1105 1106 log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL); 1107 if (!log) { 1108 xlog_warn("XFS: Log allocation failed: No memory!"); 1109 goto out; 1110 } 1111 1112 log->l_mp = mp; 1113 log->l_targ = log_target; 1114 log->l_logsize = BBTOB(num_bblks); 1115 log->l_logBBstart = blk_offset; 1116 log->l_logBBsize = num_bblks; 1117 log->l_covered_state = XLOG_STATE_COVER_IDLE; 1118 log->l_flags |= XLOG_ACTIVE_RECOVERY; 1119 1120 log->l_prev_block = -1; 1121 log->l_tail_lsn = xlog_assign_lsn(1, 0); 1122 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ 1123 log->l_last_sync_lsn = log->l_tail_lsn; 1124 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ 1125 log->l_grant_reserve_cycle = 1; 1126 log->l_grant_write_cycle = 1; 1127 1128 error = EFSCORRUPTED; 1129 if (xfs_sb_version_hassector(&mp->m_sb)) { 1130 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; 1131 if (log->l_sectbb_log < 0 || 1132 log->l_sectbb_log > mp->m_sectbb_log) { 1133 xlog_warn("XFS: Log sector size (0x%x) out of range.", 1134 log->l_sectbb_log); 1135 goto out_free_log; 1136 } 1137 1138 /* for larger sector sizes, must have v2 or external log */ 1139 if (log->l_sectbb_log != 0 && 1140 (log->l_logBBstart != 0 && 1141 !xfs_sb_version_haslogv2(&mp->m_sb))) { 1142 xlog_warn("XFS: log sector size (0x%x) invalid " 1143 "for configuration.", log->l_sectbb_log); 1144 goto out_free_log; 1145 } 1146 if (mp->m_sb.sb_logsectlog < BBSHIFT) { 1147 xlog_warn("XFS: Log sector log (0x%x) too small.", 1148 mp->m_sb.sb_logsectlog); 1149 goto out_free_log; 1150 } 1151 } 1152 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; 1153 1154 xlog_get_iclog_buffer_size(mp, log); 1155 1156 error = ENOMEM; 1157 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1158 if (!bp) 1159 goto out_free_log; 1160 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1161 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1162 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1163 ASSERT(XFS_BUF_ISBUSY(bp)); 1164 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 1165 log->l_xbuf = bp; 1166 1167 spin_lock_init(&log->l_icloglock); 1168 spin_lock_init(&log->l_grant_lock); 1169 sv_init(&log->l_flush_wait, 0, "flush_wait"); 1170 1171 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ 1172 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); 1173 1174 iclogp = &log->l_iclog; 1175 /* 1176 * The amount of memory to allocate for the iclog structure is 1177 * rather funky due to the way the structure is defined. It is 1178 * done this way so that we can use different sizes for machines 1179 * with different amounts of memory. See the definition of 1180 * xlog_in_core_t in xfs_log_priv.h for details. 1181 */ 1182 iclogsize = log->l_iclog_size; 1183 ASSERT(log->l_iclog_size >= 4096); 1184 for (i=0; i < log->l_iclog_bufs; i++) { 1185 *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); 1186 if (!*iclogp) 1187 goto out_free_iclog; 1188 1189 iclog = *iclogp; 1190 iclog->ic_prev = prev_iclog; 1191 prev_iclog = iclog; 1192 1193 bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp); 1194 if (!bp) 1195 goto out_free_iclog; 1196 if (!XFS_BUF_CPSEMA(bp)) 1197 ASSERT(0); 1198 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1199 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1200 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1201 iclog->ic_bp = bp; 1202 iclog->ic_data = bp->b_addr; 1203 #ifdef DEBUG 1204 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); 1205 #endif 1206 head = &iclog->ic_header; 1207 memset(head, 0, sizeof(xlog_rec_header_t)); 1208 head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); 1209 head->h_version = cpu_to_be32( 1210 xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); 1211 head->h_size = cpu_to_be32(log->l_iclog_size); 1212 /* new fields */ 1213 head->h_fmt = cpu_to_be32(XLOG_FMT); 1214 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); 1215 1216 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; 1217 iclog->ic_state = XLOG_STATE_ACTIVE; 1218 iclog->ic_log = log; 1219 atomic_set(&iclog->ic_refcnt, 0); 1220 spin_lock_init(&iclog->ic_callback_lock); 1221 iclog->ic_callback_tail = &(iclog->ic_callback); 1222 iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; 1223 1224 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); 1225 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); 1226 sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force"); 1227 sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write"); 1228 1229 iclogp = &iclog->ic_next; 1230 } 1231 *iclogp = log->l_iclog; /* complete ring */ 1232 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ 1233 1234 return log; 1235 1236 out_free_iclog: 1237 for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { 1238 prev_iclog = iclog->ic_next; 1239 if (iclog->ic_bp) { 1240 sv_destroy(&iclog->ic_force_wait); 1241 sv_destroy(&iclog->ic_write_wait); 1242 xfs_buf_free(iclog->ic_bp); 1243 } 1244 kmem_free(iclog); 1245 } 1246 spinlock_destroy(&log->l_icloglock); 1247 spinlock_destroy(&log->l_grant_lock); 1248 xfs_buf_free(log->l_xbuf); 1249 out_free_log: 1250 kmem_free(log); 1251 out: 1252 return ERR_PTR(-error); 1253 } /* xlog_alloc_log */ 1254 1255 1256 /* 1257 * Write out the commit record of a transaction associated with the given 1258 * ticket. Return the lsn of the commit record. 1259 */ 1260 STATIC int 1261 xlog_commit_record(xfs_mount_t *mp, 1262 xlog_ticket_t *ticket, 1263 xlog_in_core_t **iclog, 1264 xfs_lsn_t *commitlsnp) 1265 { 1266 int error; 1267 xfs_log_iovec_t reg[1]; 1268 1269 reg[0].i_addr = NULL; 1270 reg[0].i_len = 0; 1271 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); 1272 1273 ASSERT_ALWAYS(iclog); 1274 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, 1275 iclog, XLOG_COMMIT_TRANS))) { 1276 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 1277 } 1278 return error; 1279 } /* xlog_commit_record */ 1280 1281 1282 /* 1283 * Push on the buffer cache code if we ever use more than 75% of the on-disk 1284 * log space. This code pushes on the lsn which would supposedly free up 1285 * the 25% which we want to leave free. We may need to adopt a policy which 1286 * pushes on an lsn which is further along in the log once we reach the high 1287 * water mark. In this manner, we would be creating a low water mark. 1288 */ 1289 STATIC void 1290 xlog_grant_push_ail(xfs_mount_t *mp, 1291 int need_bytes) 1292 { 1293 xlog_t *log = mp->m_log; /* pointer to the log */ 1294 xfs_lsn_t tail_lsn; /* lsn of the log tail */ 1295 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ 1296 int free_blocks; /* free blocks left to write to */ 1297 int free_bytes; /* free bytes left to write to */ 1298 int threshold_block; /* block in lsn we'd like to be at */ 1299 int threshold_cycle; /* lsn cycle we'd like to be at */ 1300 int free_threshold; 1301 1302 ASSERT(BTOBB(need_bytes) < log->l_logBBsize); 1303 1304 spin_lock(&log->l_grant_lock); 1305 free_bytes = xlog_space_left(log, 1306 log->l_grant_reserve_cycle, 1307 log->l_grant_reserve_bytes); 1308 tail_lsn = log->l_tail_lsn; 1309 free_blocks = BTOBBT(free_bytes); 1310 1311 /* 1312 * Set the threshold for the minimum number of free blocks in the 1313 * log to the maximum of what the caller needs, one quarter of the 1314 * log, and 256 blocks. 1315 */ 1316 free_threshold = BTOBB(need_bytes); 1317 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); 1318 free_threshold = MAX(free_threshold, 256); 1319 if (free_blocks < free_threshold) { 1320 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; 1321 threshold_cycle = CYCLE_LSN(tail_lsn); 1322 if (threshold_block >= log->l_logBBsize) { 1323 threshold_block -= log->l_logBBsize; 1324 threshold_cycle += 1; 1325 } 1326 threshold_lsn = xlog_assign_lsn(threshold_cycle, threshold_block); 1327 1328 /* Don't pass in an lsn greater than the lsn of the last 1329 * log record known to be on disk. 1330 */ 1331 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) 1332 threshold_lsn = log->l_last_sync_lsn; 1333 } 1334 spin_unlock(&log->l_grant_lock); 1335 1336 /* 1337 * Get the transaction layer to kick the dirty buffers out to 1338 * disk asynchronously. No point in trying to do this if 1339 * the filesystem is shutting down. 1340 */ 1341 if (threshold_lsn && 1342 !XLOG_FORCED_SHUTDOWN(log)) 1343 xfs_trans_ail_push(log->l_ailp, threshold_lsn); 1344 } /* xlog_grant_push_ail */ 1345 1346 1347 /* 1348 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous 1349 * fashion. Previously, we should have moved the current iclog 1350 * ptr in the log to point to the next available iclog. This allows further 1351 * write to continue while this code syncs out an iclog ready to go. 1352 * Before an in-core log can be written out, the data section must be scanned 1353 * to save away the 1st word of each BBSIZE block into the header. We replace 1354 * it with the current cycle count. Each BBSIZE block is tagged with the 1355 * cycle count because there in an implicit assumption that drives will 1356 * guarantee that entire 512 byte blocks get written at once. In other words, 1357 * we can't have part of a 512 byte block written and part not written. By 1358 * tagging each block, we will know which blocks are valid when recovering 1359 * after an unclean shutdown. 1360 * 1361 * This routine is single threaded on the iclog. No other thread can be in 1362 * this routine with the same iclog. Changing contents of iclog can there- 1363 * fore be done without grabbing the state machine lock. Updating the global 1364 * log will require grabbing the lock though. 1365 * 1366 * The entire log manager uses a logical block numbering scheme. Only 1367 * log_sync (and then only bwrite()) know about the fact that the log may 1368 * not start with block zero on a given device. The log block start offset 1369 * is added immediately before calling bwrite(). 1370 */ 1371 1372 STATIC int 1373 xlog_sync(xlog_t *log, 1374 xlog_in_core_t *iclog) 1375 { 1376 xfs_caddr_t dptr; /* pointer to byte sized element */ 1377 xfs_buf_t *bp; 1378 int i; 1379 uint count; /* byte count of bwrite */ 1380 uint count_init; /* initial count before roundup */ 1381 int roundoff; /* roundoff to BB or stripe */ 1382 int split = 0; /* split write into two regions */ 1383 int error; 1384 int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); 1385 1386 XFS_STATS_INC(xs_log_writes); 1387 ASSERT(atomic_read(&iclog->ic_refcnt) == 0); 1388 1389 /* Add for LR header */ 1390 count_init = log->l_iclog_hsize + iclog->ic_offset; 1391 1392 /* Round out the log write size */ 1393 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { 1394 /* we have a v2 stripe unit to use */ 1395 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); 1396 } else { 1397 count = BBTOB(BTOBB(count_init)); 1398 } 1399 roundoff = count - count_init; 1400 ASSERT(roundoff >= 0); 1401 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && 1402 roundoff < log->l_mp->m_sb.sb_logsunit) 1403 || 1404 (log->l_mp->m_sb.sb_logsunit <= 1 && 1405 roundoff < BBTOB(1))); 1406 1407 /* move grant heads by roundoff in sync */ 1408 spin_lock(&log->l_grant_lock); 1409 xlog_grant_add_space(log, roundoff); 1410 spin_unlock(&log->l_grant_lock); 1411 1412 /* put cycle number in every block */ 1413 xlog_pack_data(log, iclog, roundoff); 1414 1415 /* real byte length */ 1416 if (v2) { 1417 iclog->ic_header.h_len = 1418 cpu_to_be32(iclog->ic_offset + roundoff); 1419 } else { 1420 iclog->ic_header.h_len = 1421 cpu_to_be32(iclog->ic_offset); 1422 } 1423 1424 bp = iclog->ic_bp; 1425 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); 1426 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1427 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); 1428 1429 XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); 1430 1431 /* Do we need to split this write into 2 parts? */ 1432 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { 1433 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); 1434 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); 1435 iclog->ic_bwritecnt = 2; /* split into 2 writes */ 1436 } else { 1437 iclog->ic_bwritecnt = 1; 1438 } 1439 XFS_BUF_SET_COUNT(bp, count); 1440 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ 1441 XFS_BUF_ZEROFLAGS(bp); 1442 XFS_BUF_BUSY(bp); 1443 XFS_BUF_ASYNC(bp); 1444 bp->b_flags |= XBF_LOG_BUFFER; 1445 /* 1446 * Do an ordered write for the log block. 1447 * Its unnecessary to flush the first split block in the log wrap case. 1448 */ 1449 if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) 1450 XFS_BUF_ORDERED(bp); 1451 1452 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1453 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1454 1455 xlog_verify_iclog(log, iclog, count, B_TRUE); 1456 1457 /* account for log which doesn't start at block #0 */ 1458 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1459 /* 1460 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem 1461 * is shutting down. 1462 */ 1463 XFS_BUF_WRITE(bp); 1464 1465 if ((error = XFS_bwrite(bp))) { 1466 xfs_ioerror_alert("xlog_sync", log->l_mp, bp, 1467 XFS_BUF_ADDR(bp)); 1468 return error; 1469 } 1470 if (split) { 1471 bp = iclog->ic_log->l_xbuf; 1472 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == 1473 (unsigned long)1); 1474 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1475 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ 1476 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ 1477 (__psint_t)count), split); 1478 XFS_BUF_SET_FSPRIVATE(bp, iclog); 1479 XFS_BUF_ZEROFLAGS(bp); 1480 XFS_BUF_BUSY(bp); 1481 XFS_BUF_ASYNC(bp); 1482 bp->b_flags |= XBF_LOG_BUFFER; 1483 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) 1484 XFS_BUF_ORDERED(bp); 1485 dptr = XFS_BUF_PTR(bp); 1486 /* 1487 * Bump the cycle numbers at the start of each block 1488 * since this part of the buffer is at the start of 1489 * a new cycle. Watch out for the header magic number 1490 * case, though. 1491 */ 1492 for (i = 0; i < split; i += BBSIZE) { 1493 be32_add_cpu((__be32 *)dptr, 1); 1494 if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM) 1495 be32_add_cpu((__be32 *)dptr, 1); 1496 dptr += BBSIZE; 1497 } 1498 1499 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1500 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1501 1502 /* account for internal log which doesn't start at block #0 */ 1503 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1504 XFS_BUF_WRITE(bp); 1505 if ((error = XFS_bwrite(bp))) { 1506 xfs_ioerror_alert("xlog_sync (split)", log->l_mp, 1507 bp, XFS_BUF_ADDR(bp)); 1508 return error; 1509 } 1510 } 1511 return 0; 1512 } /* xlog_sync */ 1513 1514 1515 /* 1516 * Deallocate a log structure 1517 */ 1518 STATIC void 1519 xlog_dealloc_log(xlog_t *log) 1520 { 1521 xlog_in_core_t *iclog, *next_iclog; 1522 int i; 1523 1524 iclog = log->l_iclog; 1525 for (i=0; i<log->l_iclog_bufs; i++) { 1526 sv_destroy(&iclog->ic_force_wait); 1527 sv_destroy(&iclog->ic_write_wait); 1528 xfs_buf_free(iclog->ic_bp); 1529 next_iclog = iclog->ic_next; 1530 kmem_free(iclog); 1531 iclog = next_iclog; 1532 } 1533 spinlock_destroy(&log->l_icloglock); 1534 spinlock_destroy(&log->l_grant_lock); 1535 1536 xfs_buf_free(log->l_xbuf); 1537 log->l_mp->m_log = NULL; 1538 kmem_free(log); 1539 } /* xlog_dealloc_log */ 1540 1541 /* 1542 * Update counters atomically now that memcpy is done. 1543 */ 1544 /* ARGSUSED */ 1545 static inline void 1546 xlog_state_finish_copy(xlog_t *log, 1547 xlog_in_core_t *iclog, 1548 int record_cnt, 1549 int copy_bytes) 1550 { 1551 spin_lock(&log->l_icloglock); 1552 1553 be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); 1554 iclog->ic_offset += copy_bytes; 1555 1556 spin_unlock(&log->l_icloglock); 1557 } /* xlog_state_finish_copy */ 1558 1559 1560 1561 1562 /* 1563 * print out info relating to regions written which consume 1564 * the reservation 1565 */ 1566 STATIC void 1567 xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) 1568 { 1569 uint i; 1570 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); 1571 1572 /* match with XLOG_REG_TYPE_* in xfs_log.h */ 1573 static char *res_type_str[XLOG_REG_TYPE_MAX] = { 1574 "bformat", 1575 "bchunk", 1576 "efi_format", 1577 "efd_format", 1578 "iformat", 1579 "icore", 1580 "iext", 1581 "ibroot", 1582 "ilocal", 1583 "iattr_ext", 1584 "iattr_broot", 1585 "iattr_local", 1586 "qformat", 1587 "dquot", 1588 "quotaoff", 1589 "LR header", 1590 "unmount", 1591 "commit", 1592 "trans header" 1593 }; 1594 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { 1595 "SETATTR_NOT_SIZE", 1596 "SETATTR_SIZE", 1597 "INACTIVE", 1598 "CREATE", 1599 "CREATE_TRUNC", 1600 "TRUNCATE_FILE", 1601 "REMOVE", 1602 "LINK", 1603 "RENAME", 1604 "MKDIR", 1605 "RMDIR", 1606 "SYMLINK", 1607 "SET_DMATTRS", 1608 "GROWFS", 1609 "STRAT_WRITE", 1610 "DIOSTRAT", 1611 "WRITE_SYNC", 1612 "WRITEID", 1613 "ADDAFORK", 1614 "ATTRINVAL", 1615 "ATRUNCATE", 1616 "ATTR_SET", 1617 "ATTR_RM", 1618 "ATTR_FLAG", 1619 "CLEAR_AGI_BUCKET", 1620 "QM_SBCHANGE", 1621 "DUMMY1", 1622 "DUMMY2", 1623 "QM_QUOTAOFF", 1624 "QM_DQALLOC", 1625 "QM_SETQLIM", 1626 "QM_DQCLUSTER", 1627 "QM_QINOCREATE", 1628 "QM_QUOTAOFF_END", 1629 "SB_UNIT", 1630 "FSYNC_TS", 1631 "GROWFSRT_ALLOC", 1632 "GROWFSRT_ZERO", 1633 "GROWFSRT_FREE", 1634 "SWAPEXT" 1635 }; 1636 1637 xfs_fs_cmn_err(CE_WARN, mp, 1638 "xfs_log_write: reservation summary:\n" 1639 " trans type = %s (%u)\n" 1640 " unit res = %d bytes\n" 1641 " current res = %d bytes\n" 1642 " total reg = %u bytes (o/flow = %u bytes)\n" 1643 " ophdrs = %u (ophdr space = %u bytes)\n" 1644 " ophdr + reg = %u bytes\n" 1645 " num regions = %u\n", 1646 ((ticket->t_trans_type <= 0 || 1647 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? 1648 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), 1649 ticket->t_trans_type, 1650 ticket->t_unit_res, 1651 ticket->t_curr_res, 1652 ticket->t_res_arr_sum, ticket->t_res_o_flow, 1653 ticket->t_res_num_ophdrs, ophdr_spc, 1654 ticket->t_res_arr_sum + 1655 ticket->t_res_o_flow + ophdr_spc, 1656 ticket->t_res_num); 1657 1658 for (i = 0; i < ticket->t_res_num; i++) { 1659 uint r_type = ticket->t_res_arr[i].r_type; 1660 cmn_err(CE_WARN, 1661 "region[%u]: %s - %u bytes\n", 1662 i, 1663 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? 1664 "bad-rtype" : res_type_str[r_type-1]), 1665 ticket->t_res_arr[i].r_len); 1666 } 1667 } 1668 1669 /* 1670 * Write some region out to in-core log 1671 * 1672 * This will be called when writing externally provided regions or when 1673 * writing out a commit record for a given transaction. 1674 * 1675 * General algorithm: 1676 * 1. Find total length of this write. This may include adding to the 1677 * lengths passed in. 1678 * 2. Check whether we violate the tickets reservation. 1679 * 3. While writing to this iclog 1680 * A. Reserve as much space in this iclog as can get 1681 * B. If this is first write, save away start lsn 1682 * C. While writing this region: 1683 * 1. If first write of transaction, write start record 1684 * 2. Write log operation header (header per region) 1685 * 3. Find out if we can fit entire region into this iclog 1686 * 4. Potentially, verify destination memcpy ptr 1687 * 5. Memcpy (partial) region 1688 * 6. If partial copy, release iclog; otherwise, continue 1689 * copying more regions into current iclog 1690 * 4. Mark want sync bit (in simulation mode) 1691 * 5. Release iclog for potential flush to on-disk log. 1692 * 1693 * ERRORS: 1694 * 1. Panic if reservation is overrun. This should never happen since 1695 * reservation amounts are generated internal to the filesystem. 1696 * NOTES: 1697 * 1. Tickets are single threaded data structures. 1698 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the 1699 * syncing routine. When a single log_write region needs to span 1700 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set 1701 * on all log operation writes which don't contain the end of the 1702 * region. The XLOG_END_TRANS bit is used for the in-core log 1703 * operation which contains the end of the continued log_write region. 1704 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, 1705 * we don't really know exactly how much space will be used. As a result, 1706 * we don't update ic_offset until the end when we know exactly how many 1707 * bytes have been written out. 1708 */ 1709 STATIC int 1710 xlog_write(xfs_mount_t * mp, 1711 xfs_log_iovec_t reg[], 1712 int nentries, 1713 xfs_log_ticket_t tic, 1714 xfs_lsn_t *start_lsn, 1715 xlog_in_core_t **commit_iclog, 1716 uint flags) 1717 { 1718 xlog_t *log = mp->m_log; 1719 xlog_ticket_t *ticket = (xlog_ticket_t *)tic; 1720 xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ 1721 xlog_op_header_t *logop_head; /* ptr to log operation header */ 1722 __psint_t ptr; /* copy address into data region */ 1723 int len; /* # xlog_write() bytes 2 still copy */ 1724 int index; /* region index currently copying */ 1725 int log_offset; /* offset (from 0) into data region */ 1726 int start_rec_copy; /* # bytes to copy for start record */ 1727 int partial_copy; /* did we split a region? */ 1728 int partial_copy_len;/* # bytes copied if split region */ 1729 int need_copy; /* # bytes need to memcpy this region */ 1730 int copy_len; /* # bytes actually memcpy'ing */ 1731 int copy_off; /* # bytes from entry start */ 1732 int contwr; /* continued write of in-core log? */ 1733 int error; 1734 int record_cnt = 0, data_cnt = 0; 1735 1736 partial_copy_len = partial_copy = 0; 1737 1738 /* Calculate potential maximum space. Each region gets its own 1739 * xlog_op_header_t and may need to be double word aligned. 1740 */ 1741 len = 0; 1742 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ 1743 len += sizeof(xlog_op_header_t); 1744 ticket->t_res_num_ophdrs++; 1745 } 1746 1747 for (index = 0; index < nentries; index++) { 1748 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ 1749 ticket->t_res_num_ophdrs++; 1750 len += reg[index].i_len; 1751 xlog_tic_add_region(ticket, reg[index].i_len, reg[index].i_type); 1752 } 1753 contwr = *start_lsn = 0; 1754 1755 if (ticket->t_curr_res < len) { 1756 xlog_print_tic_res(mp, ticket); 1757 #ifdef DEBUG 1758 xlog_panic( 1759 "xfs_log_write: reservation ran out. Need to up reservation"); 1760 #else 1761 /* Customer configurable panic */ 1762 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, 1763 "xfs_log_write: reservation ran out. Need to up reservation"); 1764 /* If we did not panic, shutdown the filesystem */ 1765 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1766 #endif 1767 } else 1768 ticket->t_curr_res -= len; 1769 1770 for (index = 0; index < nentries; ) { 1771 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, 1772 &contwr, &log_offset))) 1773 return error; 1774 1775 ASSERT(log_offset <= iclog->ic_size - 1); 1776 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); 1777 1778 /* start_lsn is the first lsn written to. That's all we need. */ 1779 if (! *start_lsn) 1780 *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); 1781 1782 /* This loop writes out as many regions as can fit in the amount 1783 * of space which was allocated by xlog_state_get_iclog_space(). 1784 */ 1785 while (index < nentries) { 1786 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); 1787 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); 1788 start_rec_copy = 0; 1789 1790 /* If first write for transaction, insert start record. 1791 * We can't be trying to commit if we are inited. We can't 1792 * have any "partial_copy" if we are inited. 1793 */ 1794 if (ticket->t_flags & XLOG_TIC_INITED) { 1795 logop_head = (xlog_op_header_t *)ptr; 1796 logop_head->oh_tid = cpu_to_be32(ticket->t_tid); 1797 logop_head->oh_clientid = ticket->t_clientid; 1798 logop_head->oh_len = 0; 1799 logop_head->oh_flags = XLOG_START_TRANS; 1800 logop_head->oh_res2 = 0; 1801 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ 1802 record_cnt++; 1803 1804 start_rec_copy = sizeof(xlog_op_header_t); 1805 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); 1806 } 1807 1808 /* Copy log operation header directly into data section */ 1809 logop_head = (xlog_op_header_t *)ptr; 1810 logop_head->oh_tid = cpu_to_be32(ticket->t_tid); 1811 logop_head->oh_clientid = ticket->t_clientid; 1812 logop_head->oh_res2 = 0; 1813 1814 /* header copied directly */ 1815 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); 1816 1817 /* are we copying a commit or unmount record? */ 1818 logop_head->oh_flags = flags; 1819 1820 /* 1821 * We've seen logs corrupted with bad transaction client 1822 * ids. This makes sure that XFS doesn't generate them on. 1823 * Turn this into an EIO and shut down the filesystem. 1824 */ 1825 switch (logop_head->oh_clientid) { 1826 case XFS_TRANSACTION: 1827 case XFS_VOLUME: 1828 case XFS_LOG: 1829 break; 1830 default: 1831 xfs_fs_cmn_err(CE_WARN, mp, 1832 "Bad XFS transaction clientid 0x%x in ticket 0x%p", 1833 logop_head->oh_clientid, tic); 1834 return XFS_ERROR(EIO); 1835 } 1836 1837 /* Partial write last time? => (partial_copy != 0) 1838 * need_copy is the amount we'd like to copy if everything could 1839 * fit in the current memcpy. 1840 */ 1841 need_copy = reg[index].i_len - partial_copy_len; 1842 1843 copy_off = partial_copy_len; 1844 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ 1845 copy_len = need_copy; 1846 logop_head->oh_len = cpu_to_be32(copy_len); 1847 if (partial_copy) 1848 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); 1849 partial_copy_len = partial_copy = 0; 1850 } else { /* partial write */ 1851 copy_len = iclog->ic_size - log_offset; 1852 logop_head->oh_len = cpu_to_be32(copy_len); 1853 logop_head->oh_flags |= XLOG_CONTINUE_TRANS; 1854 if (partial_copy) 1855 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; 1856 partial_copy_len += copy_len; 1857 partial_copy++; 1858 len += sizeof(xlog_op_header_t); /* from splitting of region */ 1859 /* account for new log op header */ 1860 ticket->t_curr_res -= sizeof(xlog_op_header_t); 1861 ticket->t_res_num_ophdrs++; 1862 } 1863 xlog_verify_dest_ptr(log, ptr); 1864 1865 /* copy region */ 1866 ASSERT(copy_len >= 0); 1867 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); 1868 xlog_write_adv_cnt(ptr, len, log_offset, copy_len); 1869 1870 /* make copy_len total bytes copied, including headers */ 1871 copy_len += start_rec_copy + sizeof(xlog_op_header_t); 1872 record_cnt++; 1873 data_cnt += contwr ? copy_len : 0; 1874 if (partial_copy) { /* copied partial region */ 1875 /* already marked WANT_SYNC by xlog_state_get_iclog_space */ 1876 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1877 record_cnt = data_cnt = 0; 1878 if ((error = xlog_state_release_iclog(log, iclog))) 1879 return error; 1880 break; /* don't increment index */ 1881 } else { /* copied entire region */ 1882 index++; 1883 partial_copy_len = partial_copy = 0; 1884 1885 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { 1886 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1887 record_cnt = data_cnt = 0; 1888 spin_lock(&log->l_icloglock); 1889 xlog_state_want_sync(log, iclog); 1890 spin_unlock(&log->l_icloglock); 1891 if (commit_iclog) { 1892 ASSERT(flags & XLOG_COMMIT_TRANS); 1893 *commit_iclog = iclog; 1894 } else if ((error = xlog_state_release_iclog(log, iclog))) 1895 return error; 1896 if (index == nentries) 1897 return 0; /* we are done */ 1898 else 1899 break; 1900 } 1901 } /* if (partial_copy) */ 1902 } /* while (index < nentries) */ 1903 } /* for (index = 0; index < nentries; ) */ 1904 ASSERT(len == 0); 1905 1906 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1907 if (commit_iclog) { 1908 ASSERT(flags & XLOG_COMMIT_TRANS); 1909 *commit_iclog = iclog; 1910 return 0; 1911 } 1912 return xlog_state_release_iclog(log, iclog); 1913 } /* xlog_write */ 1914 1915 1916 /***************************************************************************** 1917 * 1918 * State Machine functions 1919 * 1920 ***************************************************************************** 1921 */ 1922 1923 /* Clean iclogs starting from the head. This ordering must be 1924 * maintained, so an iclog doesn't become ACTIVE beyond one that 1925 * is SYNCING. This is also required to maintain the notion that we use 1926 * a ordered wait queue to hold off would be writers to the log when every 1927 * iclog is trying to sync to disk. 1928 * 1929 * State Change: DIRTY -> ACTIVE 1930 */ 1931 STATIC void 1932 xlog_state_clean_log(xlog_t *log) 1933 { 1934 xlog_in_core_t *iclog; 1935 int changed = 0; 1936 1937 iclog = log->l_iclog; 1938 do { 1939 if (iclog->ic_state == XLOG_STATE_DIRTY) { 1940 iclog->ic_state = XLOG_STATE_ACTIVE; 1941 iclog->ic_offset = 0; 1942 ASSERT(iclog->ic_callback == NULL); 1943 /* 1944 * If the number of ops in this iclog indicate it just 1945 * contains the dummy transaction, we can 1946 * change state into IDLE (the second time around). 1947 * Otherwise we should change the state into 1948 * NEED a dummy. 1949 * We don't need to cover the dummy. 1950 */ 1951 if (!changed && 1952 (be32_to_cpu(iclog->ic_header.h_num_logops) == 1953 XLOG_COVER_OPS)) { 1954 changed = 1; 1955 } else { 1956 /* 1957 * We have two dirty iclogs so start over 1958 * This could also be num of ops indicates 1959 * this is not the dummy going out. 1960 */ 1961 changed = 2; 1962 } 1963 iclog->ic_header.h_num_logops = 0; 1964 memset(iclog->ic_header.h_cycle_data, 0, 1965 sizeof(iclog->ic_header.h_cycle_data)); 1966 iclog->ic_header.h_lsn = 0; 1967 } else if (iclog->ic_state == XLOG_STATE_ACTIVE) 1968 /* do nothing */; 1969 else 1970 break; /* stop cleaning */ 1971 iclog = iclog->ic_next; 1972 } while (iclog != log->l_iclog); 1973 1974 /* log is locked when we are called */ 1975 /* 1976 * Change state for the dummy log recording. 1977 * We usually go to NEED. But we go to NEED2 if the changed indicates 1978 * we are done writing the dummy record. 1979 * If we are done with the second dummy recored (DONE2), then 1980 * we go to IDLE. 1981 */ 1982 if (changed) { 1983 switch (log->l_covered_state) { 1984 case XLOG_STATE_COVER_IDLE: 1985 case XLOG_STATE_COVER_NEED: 1986 case XLOG_STATE_COVER_NEED2: 1987 log->l_covered_state = XLOG_STATE_COVER_NEED; 1988 break; 1989 1990 case XLOG_STATE_COVER_DONE: 1991 if (changed == 1) 1992 log->l_covered_state = XLOG_STATE_COVER_NEED2; 1993 else 1994 log->l_covered_state = XLOG_STATE_COVER_NEED; 1995 break; 1996 1997 case XLOG_STATE_COVER_DONE2: 1998 if (changed == 1) 1999 log->l_covered_state = XLOG_STATE_COVER_IDLE; 2000 else 2001 log->l_covered_state = XLOG_STATE_COVER_NEED; 2002 break; 2003 2004 default: 2005 ASSERT(0); 2006 } 2007 } 2008 } /* xlog_state_clean_log */ 2009 2010 STATIC xfs_lsn_t 2011 xlog_get_lowest_lsn( 2012 xlog_t *log) 2013 { 2014 xlog_in_core_t *lsn_log; 2015 xfs_lsn_t lowest_lsn, lsn; 2016 2017 lsn_log = log->l_iclog; 2018 lowest_lsn = 0; 2019 do { 2020 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { 2021 lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); 2022 if ((lsn && !lowest_lsn) || 2023 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { 2024 lowest_lsn = lsn; 2025 } 2026 } 2027 lsn_log = lsn_log->ic_next; 2028 } while (lsn_log != log->l_iclog); 2029 return lowest_lsn; 2030 } 2031 2032 2033 STATIC void 2034 xlog_state_do_callback( 2035 xlog_t *log, 2036 int aborted, 2037 xlog_in_core_t *ciclog) 2038 { 2039 xlog_in_core_t *iclog; 2040 xlog_in_core_t *first_iclog; /* used to know when we've 2041 * processed all iclogs once */ 2042 xfs_log_callback_t *cb, *cb_next; 2043 int flushcnt = 0; 2044 xfs_lsn_t lowest_lsn; 2045 int ioerrors; /* counter: iclogs with errors */ 2046 int loopdidcallbacks; /* flag: inner loop did callbacks*/ 2047 int funcdidcallbacks; /* flag: function did callbacks */ 2048 int repeats; /* for issuing console warnings if 2049 * looping too many times */ 2050 int wake = 0; 2051 2052 spin_lock(&log->l_icloglock); 2053 first_iclog = iclog = log->l_iclog; 2054 ioerrors = 0; 2055 funcdidcallbacks = 0; 2056 repeats = 0; 2057 2058 do { 2059 /* 2060 * Scan all iclogs starting with the one pointed to by the 2061 * log. Reset this starting point each time the log is 2062 * unlocked (during callbacks). 2063 * 2064 * Keep looping through iclogs until one full pass is made 2065 * without running any callbacks. 2066 */ 2067 first_iclog = log->l_iclog; 2068 iclog = log->l_iclog; 2069 loopdidcallbacks = 0; 2070 repeats++; 2071 2072 do { 2073 2074 /* skip all iclogs in the ACTIVE & DIRTY states */ 2075 if (iclog->ic_state & 2076 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { 2077 iclog = iclog->ic_next; 2078 continue; 2079 } 2080 2081 /* 2082 * Between marking a filesystem SHUTDOWN and stopping 2083 * the log, we do flush all iclogs to disk (if there 2084 * wasn't a log I/O error). So, we do want things to 2085 * go smoothly in case of just a SHUTDOWN w/o a 2086 * LOG_IO_ERROR. 2087 */ 2088 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 2089 /* 2090 * Can only perform callbacks in order. Since 2091 * this iclog is not in the DONE_SYNC/ 2092 * DO_CALLBACK state, we skip the rest and 2093 * just try to clean up. If we set our iclog 2094 * to DO_CALLBACK, we will not process it when 2095 * we retry since a previous iclog is in the 2096 * CALLBACK and the state cannot change since 2097 * we are holding the l_icloglock. 2098 */ 2099 if (!(iclog->ic_state & 2100 (XLOG_STATE_DONE_SYNC | 2101 XLOG_STATE_DO_CALLBACK))) { 2102 if (ciclog && (ciclog->ic_state == 2103 XLOG_STATE_DONE_SYNC)) { 2104 ciclog->ic_state = XLOG_STATE_DO_CALLBACK; 2105 } 2106 break; 2107 } 2108 /* 2109 * We now have an iclog that is in either the 2110 * DO_CALLBACK or DONE_SYNC states. The other 2111 * states (WANT_SYNC, SYNCING, or CALLBACK were 2112 * caught by the above if and are going to 2113 * clean (i.e. we aren't doing their callbacks) 2114 * see the above if. 2115 */ 2116 2117 /* 2118 * We will do one more check here to see if we 2119 * have chased our tail around. 2120 */ 2121 2122 lowest_lsn = xlog_get_lowest_lsn(log); 2123 if (lowest_lsn && 2124 XFS_LSN_CMP(lowest_lsn, 2125 be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { 2126 iclog = iclog->ic_next; 2127 continue; /* Leave this iclog for 2128 * another thread */ 2129 } 2130 2131 iclog->ic_state = XLOG_STATE_CALLBACK; 2132 2133 spin_unlock(&log->l_icloglock); 2134 2135 /* l_last_sync_lsn field protected by 2136 * l_grant_lock. Don't worry about iclog's lsn. 2137 * No one else can be here except us. 2138 */ 2139 spin_lock(&log->l_grant_lock); 2140 ASSERT(XFS_LSN_CMP(log->l_last_sync_lsn, 2141 be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); 2142 log->l_last_sync_lsn = 2143 be64_to_cpu(iclog->ic_header.h_lsn); 2144 spin_unlock(&log->l_grant_lock); 2145 2146 } else { 2147 spin_unlock(&log->l_icloglock); 2148 ioerrors++; 2149 } 2150 2151 /* 2152 * Keep processing entries in the callback list until 2153 * we come around and it is empty. We need to 2154 * atomically see that the list is empty and change the 2155 * state to DIRTY so that we don't miss any more 2156 * callbacks being added. 2157 */ 2158 spin_lock(&iclog->ic_callback_lock); 2159 cb = iclog->ic_callback; 2160 while (cb) { 2161 iclog->ic_callback_tail = &(iclog->ic_callback); 2162 iclog->ic_callback = NULL; 2163 spin_unlock(&iclog->ic_callback_lock); 2164 2165 /* perform callbacks in the order given */ 2166 for (; cb; cb = cb_next) { 2167 cb_next = cb->cb_next; 2168 cb->cb_func(cb->cb_arg, aborted); 2169 } 2170 spin_lock(&iclog->ic_callback_lock); 2171 cb = iclog->ic_callback; 2172 } 2173 2174 loopdidcallbacks++; 2175 funcdidcallbacks++; 2176 2177 spin_lock(&log->l_icloglock); 2178 ASSERT(iclog->ic_callback == NULL); 2179 spin_unlock(&iclog->ic_callback_lock); 2180 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) 2181 iclog->ic_state = XLOG_STATE_DIRTY; 2182 2183 /* 2184 * Transition from DIRTY to ACTIVE if applicable. 2185 * NOP if STATE_IOERROR. 2186 */ 2187 xlog_state_clean_log(log); 2188 2189 /* wake up threads waiting in xfs_log_force() */ 2190 sv_broadcast(&iclog->ic_force_wait); 2191 2192 iclog = iclog->ic_next; 2193 } while (first_iclog != iclog); 2194 2195 if (repeats > 5000) { 2196 flushcnt += repeats; 2197 repeats = 0; 2198 xfs_fs_cmn_err(CE_WARN, log->l_mp, 2199 "%s: possible infinite loop (%d iterations)", 2200 __func__, flushcnt); 2201 } 2202 } while (!ioerrors && loopdidcallbacks); 2203 2204 /* 2205 * make one last gasp attempt to see if iclogs are being left in 2206 * limbo.. 2207 */ 2208 #ifdef DEBUG 2209 if (funcdidcallbacks) { 2210 first_iclog = iclog = log->l_iclog; 2211 do { 2212 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); 2213 /* 2214 * Terminate the loop if iclogs are found in states 2215 * which will cause other threads to clean up iclogs. 2216 * 2217 * SYNCING - i/o completion will go through logs 2218 * DONE_SYNC - interrupt thread should be waiting for 2219 * l_icloglock 2220 * IOERROR - give up hope all ye who enter here 2221 */ 2222 if (iclog->ic_state == XLOG_STATE_WANT_SYNC || 2223 iclog->ic_state == XLOG_STATE_SYNCING || 2224 iclog->ic_state == XLOG_STATE_DONE_SYNC || 2225 iclog->ic_state == XLOG_STATE_IOERROR ) 2226 break; 2227 iclog = iclog->ic_next; 2228 } while (first_iclog != iclog); 2229 } 2230 #endif 2231 2232 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) 2233 wake = 1; 2234 spin_unlock(&log->l_icloglock); 2235 2236 if (wake) 2237 sv_broadcast(&log->l_flush_wait); 2238 } 2239 2240 2241 /* 2242 * Finish transitioning this iclog to the dirty state. 2243 * 2244 * Make sure that we completely execute this routine only when this is 2245 * the last call to the iclog. There is a good chance that iclog flushes, 2246 * when we reach the end of the physical log, get turned into 2 separate 2247 * calls to bwrite. Hence, one iclog flush could generate two calls to this 2248 * routine. By using the reference count bwritecnt, we guarantee that only 2249 * the second completion goes through. 2250 * 2251 * Callbacks could take time, so they are done outside the scope of the 2252 * global state machine log lock. 2253 */ 2254 STATIC void 2255 xlog_state_done_syncing( 2256 xlog_in_core_t *iclog, 2257 int aborted) 2258 { 2259 xlog_t *log = iclog->ic_log; 2260 2261 spin_lock(&log->l_icloglock); 2262 2263 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || 2264 iclog->ic_state == XLOG_STATE_IOERROR); 2265 ASSERT(atomic_read(&iclog->ic_refcnt) == 0); 2266 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); 2267 2268 2269 /* 2270 * If we got an error, either on the first buffer, or in the case of 2271 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, 2272 * and none should ever be attempted to be written to disk 2273 * again. 2274 */ 2275 if (iclog->ic_state != XLOG_STATE_IOERROR) { 2276 if (--iclog->ic_bwritecnt == 1) { 2277 spin_unlock(&log->l_icloglock); 2278 return; 2279 } 2280 iclog->ic_state = XLOG_STATE_DONE_SYNC; 2281 } 2282 2283 /* 2284 * Someone could be sleeping prior to writing out the next 2285 * iclog buffer, we wake them all, one will get to do the 2286 * I/O, the others get to wait for the result. 2287 */ 2288 sv_broadcast(&iclog->ic_write_wait); 2289 spin_unlock(&log->l_icloglock); 2290 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ 2291 } /* xlog_state_done_syncing */ 2292 2293 2294 /* 2295 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must 2296 * sleep. We wait on the flush queue on the head iclog as that should be 2297 * the first iclog to complete flushing. Hence if all iclogs are syncing, 2298 * we will wait here and all new writes will sleep until a sync completes. 2299 * 2300 * The in-core logs are used in a circular fashion. They are not used 2301 * out-of-order even when an iclog past the head is free. 2302 * 2303 * return: 2304 * * log_offset where xlog_write() can start writing into the in-core 2305 * log's data space. 2306 * * in-core log pointer to which xlog_write() should write. 2307 * * boolean indicating this is a continued write to an in-core log. 2308 * If this is the last write, then the in-core log's offset field 2309 * needs to be incremented, depending on the amount of data which 2310 * is copied. 2311 */ 2312 STATIC int 2313 xlog_state_get_iclog_space(xlog_t *log, 2314 int len, 2315 xlog_in_core_t **iclogp, 2316 xlog_ticket_t *ticket, 2317 int *continued_write, 2318 int *logoffsetp) 2319 { 2320 int log_offset; 2321 xlog_rec_header_t *head; 2322 xlog_in_core_t *iclog; 2323 int error; 2324 2325 restart: 2326 spin_lock(&log->l_icloglock); 2327 if (XLOG_FORCED_SHUTDOWN(log)) { 2328 spin_unlock(&log->l_icloglock); 2329 return XFS_ERROR(EIO); 2330 } 2331 2332 iclog = log->l_iclog; 2333 if (iclog->ic_state != XLOG_STATE_ACTIVE) { 2334 XFS_STATS_INC(xs_log_noiclogs); 2335 2336 /* Wait for log writes to have flushed */ 2337 sv_wait(&log->l_flush_wait, 0, &log->l_icloglock, 0); 2338 goto restart; 2339 } 2340 2341 head = &iclog->ic_header; 2342 2343 atomic_inc(&iclog->ic_refcnt); /* prevents sync */ 2344 log_offset = iclog->ic_offset; 2345 2346 /* On the 1st write to an iclog, figure out lsn. This works 2347 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are 2348 * committing to. If the offset is set, that's how many blocks 2349 * must be written. 2350 */ 2351 if (log_offset == 0) { 2352 ticket->t_curr_res -= log->l_iclog_hsize; 2353 xlog_tic_add_region(ticket, 2354 log->l_iclog_hsize, 2355 XLOG_REG_TYPE_LRHEADER); 2356 head->h_cycle = cpu_to_be32(log->l_curr_cycle); 2357 head->h_lsn = cpu_to_be64( 2358 xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); 2359 ASSERT(log->l_curr_block >= 0); 2360 } 2361 2362 /* If there is enough room to write everything, then do it. Otherwise, 2363 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC 2364 * bit is on, so this will get flushed out. Don't update ic_offset 2365 * until you know exactly how many bytes get copied. Therefore, wait 2366 * until later to update ic_offset. 2367 * 2368 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's 2369 * can fit into remaining data section. 2370 */ 2371 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { 2372 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2373 2374 /* 2375 * If I'm the only one writing to this iclog, sync it to disk. 2376 * We need to do an atomic compare and decrement here to avoid 2377 * racing with concurrent atomic_dec_and_lock() calls in 2378 * xlog_state_release_iclog() when there is more than one 2379 * reference to the iclog. 2380 */ 2381 if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { 2382 /* we are the only one */ 2383 spin_unlock(&log->l_icloglock); 2384 error = xlog_state_release_iclog(log, iclog); 2385 if (error) 2386 return error; 2387 } else { 2388 spin_unlock(&log->l_icloglock); 2389 } 2390 goto restart; 2391 } 2392 2393 /* Do we have enough room to write the full amount in the remainder 2394 * of this iclog? Or must we continue a write on the next iclog and 2395 * mark this iclog as completely taken? In the case where we switch 2396 * iclogs (to mark it taken), this particular iclog will release/sync 2397 * to disk in xlog_write(). 2398 */ 2399 if (len <= iclog->ic_size - iclog->ic_offset) { 2400 *continued_write = 0; 2401 iclog->ic_offset += len; 2402 } else { 2403 *continued_write = 1; 2404 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2405 } 2406 *iclogp = iclog; 2407 2408 ASSERT(iclog->ic_offset <= iclog->ic_size); 2409 spin_unlock(&log->l_icloglock); 2410 2411 *logoffsetp = log_offset; 2412 return 0; 2413 } /* xlog_state_get_iclog_space */ 2414 2415 /* 2416 * Atomically get the log space required for a log ticket. 2417 * 2418 * Once a ticket gets put onto the reserveq, it will only return after 2419 * the needed reservation is satisfied. 2420 */ 2421 STATIC int 2422 xlog_grant_log_space(xlog_t *log, 2423 xlog_ticket_t *tic) 2424 { 2425 int free_bytes; 2426 int need_bytes; 2427 #ifdef DEBUG 2428 xfs_lsn_t tail_lsn; 2429 #endif 2430 2431 2432 #ifdef DEBUG 2433 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2434 panic("grant Recovery problem"); 2435 #endif 2436 2437 /* Is there space or do we need to sleep? */ 2438 spin_lock(&log->l_grant_lock); 2439 2440 trace_xfs_log_grant_enter(log, tic); 2441 2442 /* something is already sleeping; insert new transaction at end */ 2443 if (log->l_reserve_headq) { 2444 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2445 2446 trace_xfs_log_grant_sleep1(log, tic); 2447 2448 /* 2449 * Gotta check this before going to sleep, while we're 2450 * holding the grant lock. 2451 */ 2452 if (XLOG_FORCED_SHUTDOWN(log)) 2453 goto error_return; 2454 2455 XFS_STATS_INC(xs_sleep_logspace); 2456 sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); 2457 /* 2458 * If we got an error, and the filesystem is shutting down, 2459 * we'll catch it down below. So just continue... 2460 */ 2461 trace_xfs_log_grant_wake1(log, tic); 2462 spin_lock(&log->l_grant_lock); 2463 } 2464 if (tic->t_flags & XFS_LOG_PERM_RESERV) 2465 need_bytes = tic->t_unit_res*tic->t_ocnt; 2466 else 2467 need_bytes = tic->t_unit_res; 2468 2469 redo: 2470 if (XLOG_FORCED_SHUTDOWN(log)) 2471 goto error_return; 2472 2473 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, 2474 log->l_grant_reserve_bytes); 2475 if (free_bytes < need_bytes) { 2476 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2477 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2478 2479 trace_xfs_log_grant_sleep2(log, tic); 2480 2481 spin_unlock(&log->l_grant_lock); 2482 xlog_grant_push_ail(log->l_mp, need_bytes); 2483 spin_lock(&log->l_grant_lock); 2484 2485 XFS_STATS_INC(xs_sleep_logspace); 2486 sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); 2487 2488 spin_lock(&log->l_grant_lock); 2489 if (XLOG_FORCED_SHUTDOWN(log)) 2490 goto error_return; 2491 2492 trace_xfs_log_grant_wake2(log, tic); 2493 2494 goto redo; 2495 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2496 xlog_del_ticketq(&log->l_reserve_headq, tic); 2497 2498 /* we've got enough space */ 2499 xlog_grant_add_space(log, need_bytes); 2500 #ifdef DEBUG 2501 tail_lsn = log->l_tail_lsn; 2502 /* 2503 * Check to make sure the grant write head didn't just over lap the 2504 * tail. If the cycles are the same, we can't be overlapping. 2505 * Otherwise, make sure that the cycles differ by exactly one and 2506 * check the byte count. 2507 */ 2508 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2509 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2510 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2511 } 2512 #endif 2513 trace_xfs_log_grant_exit(log, tic); 2514 xlog_verify_grant_head(log, 1); 2515 spin_unlock(&log->l_grant_lock); 2516 return 0; 2517 2518 error_return: 2519 if (tic->t_flags & XLOG_TIC_IN_Q) 2520 xlog_del_ticketq(&log->l_reserve_headq, tic); 2521 2522 trace_xfs_log_grant_error(log, tic); 2523 2524 /* 2525 * If we are failing, make sure the ticket doesn't have any 2526 * current reservations. We don't want to add this back when 2527 * the ticket/transaction gets cancelled. 2528 */ 2529 tic->t_curr_res = 0; 2530 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2531 spin_unlock(&log->l_grant_lock); 2532 return XFS_ERROR(EIO); 2533 } /* xlog_grant_log_space */ 2534 2535 2536 /* 2537 * Replenish the byte reservation required by moving the grant write head. 2538 * 2539 * 2540 */ 2541 STATIC int 2542 xlog_regrant_write_log_space(xlog_t *log, 2543 xlog_ticket_t *tic) 2544 { 2545 int free_bytes, need_bytes; 2546 xlog_ticket_t *ntic; 2547 #ifdef DEBUG 2548 xfs_lsn_t tail_lsn; 2549 #endif 2550 2551 tic->t_curr_res = tic->t_unit_res; 2552 xlog_tic_reset_res(tic); 2553 2554 if (tic->t_cnt > 0) 2555 return 0; 2556 2557 #ifdef DEBUG 2558 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2559 panic("regrant Recovery problem"); 2560 #endif 2561 2562 spin_lock(&log->l_grant_lock); 2563 2564 trace_xfs_log_regrant_write_enter(log, tic); 2565 2566 if (XLOG_FORCED_SHUTDOWN(log)) 2567 goto error_return; 2568 2569 /* If there are other waiters on the queue then give them a 2570 * chance at logspace before us. Wake up the first waiters, 2571 * if we do not wake up all the waiters then go to sleep waiting 2572 * for more free space, otherwise try to get some space for 2573 * this transaction. 2574 */ 2575 need_bytes = tic->t_unit_res; 2576 if ((ntic = log->l_write_headq)) { 2577 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2578 log->l_grant_write_bytes); 2579 do { 2580 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); 2581 2582 if (free_bytes < ntic->t_unit_res) 2583 break; 2584 free_bytes -= ntic->t_unit_res; 2585 sv_signal(&ntic->t_wait); 2586 ntic = ntic->t_next; 2587 } while (ntic != log->l_write_headq); 2588 2589 if (ntic != log->l_write_headq) { 2590 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2591 xlog_ins_ticketq(&log->l_write_headq, tic); 2592 2593 trace_xfs_log_regrant_write_sleep1(log, tic); 2594 2595 spin_unlock(&log->l_grant_lock); 2596 xlog_grant_push_ail(log->l_mp, need_bytes); 2597 spin_lock(&log->l_grant_lock); 2598 2599 XFS_STATS_INC(xs_sleep_logspace); 2600 sv_wait(&tic->t_wait, PINOD|PLTWAIT, 2601 &log->l_grant_lock, s); 2602 2603 /* If we're shutting down, this tic is already 2604 * off the queue */ 2605 spin_lock(&log->l_grant_lock); 2606 if (XLOG_FORCED_SHUTDOWN(log)) 2607 goto error_return; 2608 2609 trace_xfs_log_regrant_write_wake1(log, tic); 2610 } 2611 } 2612 2613 redo: 2614 if (XLOG_FORCED_SHUTDOWN(log)) 2615 goto error_return; 2616 2617 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2618 log->l_grant_write_bytes); 2619 if (free_bytes < need_bytes) { 2620 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2621 xlog_ins_ticketq(&log->l_write_headq, tic); 2622 spin_unlock(&log->l_grant_lock); 2623 xlog_grant_push_ail(log->l_mp, need_bytes); 2624 spin_lock(&log->l_grant_lock); 2625 2626 XFS_STATS_INC(xs_sleep_logspace); 2627 trace_xfs_log_regrant_write_sleep2(log, tic); 2628 2629 sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); 2630 2631 /* If we're shutting down, this tic is already off the queue */ 2632 spin_lock(&log->l_grant_lock); 2633 if (XLOG_FORCED_SHUTDOWN(log)) 2634 goto error_return; 2635 2636 trace_xfs_log_regrant_write_wake2(log, tic); 2637 goto redo; 2638 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2639 xlog_del_ticketq(&log->l_write_headq, tic); 2640 2641 /* we've got enough space */ 2642 xlog_grant_add_space_write(log, need_bytes); 2643 #ifdef DEBUG 2644 tail_lsn = log->l_tail_lsn; 2645 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2646 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2647 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2648 } 2649 #endif 2650 2651 trace_xfs_log_regrant_write_exit(log, tic); 2652 2653 xlog_verify_grant_head(log, 1); 2654 spin_unlock(&log->l_grant_lock); 2655 return 0; 2656 2657 2658 error_return: 2659 if (tic->t_flags & XLOG_TIC_IN_Q) 2660 xlog_del_ticketq(&log->l_reserve_headq, tic); 2661 2662 trace_xfs_log_regrant_write_error(log, tic); 2663 2664 /* 2665 * If we are failing, make sure the ticket doesn't have any 2666 * current reservations. We don't want to add this back when 2667 * the ticket/transaction gets cancelled. 2668 */ 2669 tic->t_curr_res = 0; 2670 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2671 spin_unlock(&log->l_grant_lock); 2672 return XFS_ERROR(EIO); 2673 } /* xlog_regrant_write_log_space */ 2674 2675 2676 /* The first cnt-1 times through here we don't need to 2677 * move the grant write head because the permanent 2678 * reservation has reserved cnt times the unit amount. 2679 * Release part of current permanent unit reservation and 2680 * reset current reservation to be one units worth. Also 2681 * move grant reservation head forward. 2682 */ 2683 STATIC void 2684 xlog_regrant_reserve_log_space(xlog_t *log, 2685 xlog_ticket_t *ticket) 2686 { 2687 trace_xfs_log_regrant_reserve_enter(log, ticket); 2688 2689 if (ticket->t_cnt > 0) 2690 ticket->t_cnt--; 2691 2692 spin_lock(&log->l_grant_lock); 2693 xlog_grant_sub_space(log, ticket->t_curr_res); 2694 ticket->t_curr_res = ticket->t_unit_res; 2695 xlog_tic_reset_res(ticket); 2696 2697 trace_xfs_log_regrant_reserve_sub(log, ticket); 2698 2699 xlog_verify_grant_head(log, 1); 2700 2701 /* just return if we still have some of the pre-reserved space */ 2702 if (ticket->t_cnt > 0) { 2703 spin_unlock(&log->l_grant_lock); 2704 return; 2705 } 2706 2707 xlog_grant_add_space_reserve(log, ticket->t_unit_res); 2708 2709 trace_xfs_log_regrant_reserve_exit(log, ticket); 2710 2711 xlog_verify_grant_head(log, 0); 2712 spin_unlock(&log->l_grant_lock); 2713 ticket->t_curr_res = ticket->t_unit_res; 2714 xlog_tic_reset_res(ticket); 2715 } /* xlog_regrant_reserve_log_space */ 2716 2717 2718 /* 2719 * Give back the space left from a reservation. 2720 * 2721 * All the information we need to make a correct determination of space left 2722 * is present. For non-permanent reservations, things are quite easy. The 2723 * count should have been decremented to zero. We only need to deal with the 2724 * space remaining in the current reservation part of the ticket. If the 2725 * ticket contains a permanent reservation, there may be left over space which 2726 * needs to be released. A count of N means that N-1 refills of the current 2727 * reservation can be done before we need to ask for more space. The first 2728 * one goes to fill up the first current reservation. Once we run out of 2729 * space, the count will stay at zero and the only space remaining will be 2730 * in the current reservation field. 2731 */ 2732 STATIC void 2733 xlog_ungrant_log_space(xlog_t *log, 2734 xlog_ticket_t *ticket) 2735 { 2736 if (ticket->t_cnt > 0) 2737 ticket->t_cnt--; 2738 2739 spin_lock(&log->l_grant_lock); 2740 trace_xfs_log_ungrant_enter(log, ticket); 2741 2742 xlog_grant_sub_space(log, ticket->t_curr_res); 2743 2744 trace_xfs_log_ungrant_sub(log, ticket); 2745 2746 /* If this is a permanent reservation ticket, we may be able to free 2747 * up more space based on the remaining count. 2748 */ 2749 if (ticket->t_cnt > 0) { 2750 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); 2751 xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); 2752 } 2753 2754 trace_xfs_log_ungrant_exit(log, ticket); 2755 2756 xlog_verify_grant_head(log, 1); 2757 spin_unlock(&log->l_grant_lock); 2758 xfs_log_move_tail(log->l_mp, 1); 2759 } /* xlog_ungrant_log_space */ 2760 2761 2762 /* 2763 * Flush iclog to disk if this is the last reference to the given iclog and 2764 * the WANT_SYNC bit is set. 2765 * 2766 * When this function is entered, the iclog is not necessarily in the 2767 * WANT_SYNC state. It may be sitting around waiting to get filled. 2768 * 2769 * 2770 */ 2771 STATIC int 2772 xlog_state_release_iclog( 2773 xlog_t *log, 2774 xlog_in_core_t *iclog) 2775 { 2776 int sync = 0; /* do we sync? */ 2777 2778 if (iclog->ic_state & XLOG_STATE_IOERROR) 2779 return XFS_ERROR(EIO); 2780 2781 ASSERT(atomic_read(&iclog->ic_refcnt) > 0); 2782 if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) 2783 return 0; 2784 2785 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2786 spin_unlock(&log->l_icloglock); 2787 return XFS_ERROR(EIO); 2788 } 2789 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || 2790 iclog->ic_state == XLOG_STATE_WANT_SYNC); 2791 2792 if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { 2793 /* update tail before writing to iclog */ 2794 xlog_assign_tail_lsn(log->l_mp); 2795 sync++; 2796 iclog->ic_state = XLOG_STATE_SYNCING; 2797 iclog->ic_header.h_tail_lsn = cpu_to_be64(log->l_tail_lsn); 2798 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); 2799 /* cycle incremented when incrementing curr_block */ 2800 } 2801 spin_unlock(&log->l_icloglock); 2802 2803 /* 2804 * We let the log lock go, so it's possible that we hit a log I/O 2805 * error or some other SHUTDOWN condition that marks the iclog 2806 * as XLOG_STATE_IOERROR before the bwrite. However, we know that 2807 * this iclog has consistent data, so we ignore IOERROR 2808 * flags after this point. 2809 */ 2810 if (sync) 2811 return xlog_sync(log, iclog); 2812 return 0; 2813 } /* xlog_state_release_iclog */ 2814 2815 2816 /* 2817 * This routine will mark the current iclog in the ring as WANT_SYNC 2818 * and move the current iclog pointer to the next iclog in the ring. 2819 * When this routine is called from xlog_state_get_iclog_space(), the 2820 * exact size of the iclog has not yet been determined. All we know is 2821 * that every data block. We have run out of space in this log record. 2822 */ 2823 STATIC void 2824 xlog_state_switch_iclogs(xlog_t *log, 2825 xlog_in_core_t *iclog, 2826 int eventual_size) 2827 { 2828 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2829 if (!eventual_size) 2830 eventual_size = iclog->ic_offset; 2831 iclog->ic_state = XLOG_STATE_WANT_SYNC; 2832 iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); 2833 log->l_prev_block = log->l_curr_block; 2834 log->l_prev_cycle = log->l_curr_cycle; 2835 2836 /* roll log?: ic_offset changed later */ 2837 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); 2838 2839 /* Round up to next log-sunit */ 2840 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && 2841 log->l_mp->m_sb.sb_logsunit > 1) { 2842 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); 2843 log->l_curr_block = roundup(log->l_curr_block, sunit_bb); 2844 } 2845 2846 if (log->l_curr_block >= log->l_logBBsize) { 2847 log->l_curr_cycle++; 2848 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) 2849 log->l_curr_cycle++; 2850 log->l_curr_block -= log->l_logBBsize; 2851 ASSERT(log->l_curr_block >= 0); 2852 } 2853 ASSERT(iclog == log->l_iclog); 2854 log->l_iclog = iclog->ic_next; 2855 } /* xlog_state_switch_iclogs */ 2856 2857 2858 /* 2859 * Write out all data in the in-core log as of this exact moment in time. 2860 * 2861 * Data may be written to the in-core log during this call. However, 2862 * we don't guarantee this data will be written out. A change from past 2863 * implementation means this routine will *not* write out zero length LRs. 2864 * 2865 * Basically, we try and perform an intelligent scan of the in-core logs. 2866 * If we determine there is no flushable data, we just return. There is no 2867 * flushable data if: 2868 * 2869 * 1. the current iclog is active and has no data; the previous iclog 2870 * is in the active or dirty state. 2871 * 2. the current iclog is drity, and the previous iclog is in the 2872 * active or dirty state. 2873 * 2874 * We may sleep if: 2875 * 2876 * 1. the current iclog is not in the active nor dirty state. 2877 * 2. the current iclog dirty, and the previous iclog is not in the 2878 * active nor dirty state. 2879 * 3. the current iclog is active, and there is another thread writing 2880 * to this particular iclog. 2881 * 4. a) the current iclog is active and has no other writers 2882 * b) when we return from flushing out this iclog, it is still 2883 * not in the active nor dirty state. 2884 */ 2885 STATIC int 2886 xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed) 2887 { 2888 xlog_in_core_t *iclog; 2889 xfs_lsn_t lsn; 2890 2891 spin_lock(&log->l_icloglock); 2892 2893 iclog = log->l_iclog; 2894 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2895 spin_unlock(&log->l_icloglock); 2896 return XFS_ERROR(EIO); 2897 } 2898 2899 /* If the head iclog is not active nor dirty, we just attach 2900 * ourselves to the head and go to sleep. 2901 */ 2902 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2903 iclog->ic_state == XLOG_STATE_DIRTY) { 2904 /* 2905 * If the head is dirty or (active and empty), then 2906 * we need to look at the previous iclog. If the previous 2907 * iclog is active or dirty we are done. There is nothing 2908 * to sync out. Otherwise, we attach ourselves to the 2909 * previous iclog and go to sleep. 2910 */ 2911 if (iclog->ic_state == XLOG_STATE_DIRTY || 2912 (atomic_read(&iclog->ic_refcnt) == 0 2913 && iclog->ic_offset == 0)) { 2914 iclog = iclog->ic_prev; 2915 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2916 iclog->ic_state == XLOG_STATE_DIRTY) 2917 goto no_sleep; 2918 else 2919 goto maybe_sleep; 2920 } else { 2921 if (atomic_read(&iclog->ic_refcnt) == 0) { 2922 /* We are the only one with access to this 2923 * iclog. Flush it out now. There should 2924 * be a roundoff of zero to show that someone 2925 * has already taken care of the roundoff from 2926 * the previous sync. 2927 */ 2928 atomic_inc(&iclog->ic_refcnt); 2929 lsn = be64_to_cpu(iclog->ic_header.h_lsn); 2930 xlog_state_switch_iclogs(log, iclog, 0); 2931 spin_unlock(&log->l_icloglock); 2932 2933 if (xlog_state_release_iclog(log, iclog)) 2934 return XFS_ERROR(EIO); 2935 *log_flushed = 1; 2936 spin_lock(&log->l_icloglock); 2937 if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && 2938 iclog->ic_state != XLOG_STATE_DIRTY) 2939 goto maybe_sleep; 2940 else 2941 goto no_sleep; 2942 } else { 2943 /* Someone else is writing to this iclog. 2944 * Use its call to flush out the data. However, 2945 * the other thread may not force out this LR, 2946 * so we mark it WANT_SYNC. 2947 */ 2948 xlog_state_switch_iclogs(log, iclog, 0); 2949 goto maybe_sleep; 2950 } 2951 } 2952 } 2953 2954 /* By the time we come around again, the iclog could've been filled 2955 * which would give it another lsn. If we have a new lsn, just 2956 * return because the relevant data has been flushed. 2957 */ 2958 maybe_sleep: 2959 if (flags & XFS_LOG_SYNC) { 2960 /* 2961 * We must check if we're shutting down here, before 2962 * we wait, while we're holding the l_icloglock. 2963 * Then we check again after waking up, in case our 2964 * sleep was disturbed by a bad news. 2965 */ 2966 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2967 spin_unlock(&log->l_icloglock); 2968 return XFS_ERROR(EIO); 2969 } 2970 XFS_STATS_INC(xs_log_force_sleep); 2971 sv_wait(&iclog->ic_force_wait, PINOD, &log->l_icloglock, s); 2972 /* 2973 * No need to grab the log lock here since we're 2974 * only deciding whether or not to return EIO 2975 * and the memory read should be atomic. 2976 */ 2977 if (iclog->ic_state & XLOG_STATE_IOERROR) 2978 return XFS_ERROR(EIO); 2979 *log_flushed = 1; 2980 2981 } else { 2982 2983 no_sleep: 2984 spin_unlock(&log->l_icloglock); 2985 } 2986 return 0; 2987 } /* xlog_state_sync_all */ 2988 2989 2990 /* 2991 * Used by code which implements synchronous log forces. 2992 * 2993 * Find in-core log with lsn. 2994 * If it is in the DIRTY state, just return. 2995 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC 2996 * state and go to sleep or return. 2997 * If it is in any other state, go to sleep or return. 2998 * 2999 * If filesystem activity goes to zero, the iclog will get flushed only by 3000 * bdflush(). 3001 */ 3002 STATIC int 3003 xlog_state_sync(xlog_t *log, 3004 xfs_lsn_t lsn, 3005 uint flags, 3006 int *log_flushed) 3007 { 3008 xlog_in_core_t *iclog; 3009 int already_slept = 0; 3010 3011 try_again: 3012 spin_lock(&log->l_icloglock); 3013 iclog = log->l_iclog; 3014 3015 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3016 spin_unlock(&log->l_icloglock); 3017 return XFS_ERROR(EIO); 3018 } 3019 3020 do { 3021 if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { 3022 iclog = iclog->ic_next; 3023 continue; 3024 } 3025 3026 if (iclog->ic_state == XLOG_STATE_DIRTY) { 3027 spin_unlock(&log->l_icloglock); 3028 return 0; 3029 } 3030 3031 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3032 /* 3033 * We sleep here if we haven't already slept (e.g. 3034 * this is the first time we've looked at the correct 3035 * iclog buf) and the buffer before us is going to 3036 * be sync'ed. The reason for this is that if we 3037 * are doing sync transactions here, by waiting for 3038 * the previous I/O to complete, we can allow a few 3039 * more transactions into this iclog before we close 3040 * it down. 3041 * 3042 * Otherwise, we mark the buffer WANT_SYNC, and bump 3043 * up the refcnt so we can release the log (which drops 3044 * the ref count). The state switch keeps new transaction 3045 * commits from using this buffer. When the current commits 3046 * finish writing into the buffer, the refcount will drop to 3047 * zero and the buffer will go out then. 3048 */ 3049 if (!already_slept && 3050 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | 3051 XLOG_STATE_SYNCING))) { 3052 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); 3053 XFS_STATS_INC(xs_log_force_sleep); 3054 sv_wait(&iclog->ic_prev->ic_write_wait, PSWP, 3055 &log->l_icloglock, s); 3056 *log_flushed = 1; 3057 already_slept = 1; 3058 goto try_again; 3059 } else { 3060 atomic_inc(&iclog->ic_refcnt); 3061 xlog_state_switch_iclogs(log, iclog, 0); 3062 spin_unlock(&log->l_icloglock); 3063 if (xlog_state_release_iclog(log, iclog)) 3064 return XFS_ERROR(EIO); 3065 *log_flushed = 1; 3066 spin_lock(&log->l_icloglock); 3067 } 3068 } 3069 3070 if ((flags & XFS_LOG_SYNC) && /* sleep */ 3071 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { 3072 3073 /* 3074 * Don't wait on completion if we know that we've 3075 * gotten a log write error. 3076 */ 3077 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3078 spin_unlock(&log->l_icloglock); 3079 return XFS_ERROR(EIO); 3080 } 3081 XFS_STATS_INC(xs_log_force_sleep); 3082 sv_wait(&iclog->ic_force_wait, PSWP, &log->l_icloglock, s); 3083 /* 3084 * No need to grab the log lock here since we're 3085 * only deciding whether or not to return EIO 3086 * and the memory read should be atomic. 3087 */ 3088 if (iclog->ic_state & XLOG_STATE_IOERROR) 3089 return XFS_ERROR(EIO); 3090 *log_flushed = 1; 3091 } else { /* just return */ 3092 spin_unlock(&log->l_icloglock); 3093 } 3094 return 0; 3095 3096 } while (iclog != log->l_iclog); 3097 3098 spin_unlock(&log->l_icloglock); 3099 return 0; 3100 } /* xlog_state_sync */ 3101 3102 3103 /* 3104 * Called when we want to mark the current iclog as being ready to sync to 3105 * disk. 3106 */ 3107 STATIC void 3108 xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) 3109 { 3110 assert_spin_locked(&log->l_icloglock); 3111 3112 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3113 xlog_state_switch_iclogs(log, iclog, 0); 3114 } else { 3115 ASSERT(iclog->ic_state & 3116 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); 3117 } 3118 } 3119 3120 3121 /***************************************************************************** 3122 * 3123 * TICKET functions 3124 * 3125 ***************************************************************************** 3126 */ 3127 3128 /* 3129 * Free a used ticket when its refcount falls to zero. 3130 */ 3131 void 3132 xfs_log_ticket_put( 3133 xlog_ticket_t *ticket) 3134 { 3135 ASSERT(atomic_read(&ticket->t_ref) > 0); 3136 if (atomic_dec_and_test(&ticket->t_ref)) { 3137 sv_destroy(&ticket->t_wait); 3138 kmem_zone_free(xfs_log_ticket_zone, ticket); 3139 } 3140 } 3141 3142 xlog_ticket_t * 3143 xfs_log_ticket_get( 3144 xlog_ticket_t *ticket) 3145 { 3146 ASSERT(atomic_read(&ticket->t_ref) > 0); 3147 atomic_inc(&ticket->t_ref); 3148 return ticket; 3149 } 3150 3151 /* 3152 * Allocate and initialise a new log ticket. 3153 */ 3154 STATIC xlog_ticket_t * 3155 xlog_ticket_alloc(xlog_t *log, 3156 int unit_bytes, 3157 int cnt, 3158 char client, 3159 uint xflags) 3160 { 3161 xlog_ticket_t *tic; 3162 uint num_headers; 3163 3164 tic = kmem_zone_zalloc(xfs_log_ticket_zone, KM_SLEEP|KM_MAYFAIL); 3165 if (!tic) 3166 return NULL; 3167 3168 /* 3169 * Permanent reservations have up to 'cnt'-1 active log operations 3170 * in the log. A unit in this case is the amount of space for one 3171 * of these log operations. Normal reservations have a cnt of 1 3172 * and their unit amount is the total amount of space required. 3173 * 3174 * The following lines of code account for non-transaction data 3175 * which occupy space in the on-disk log. 3176 * 3177 * Normal form of a transaction is: 3178 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> 3179 * and then there are LR hdrs, split-recs and roundoff at end of syncs. 3180 * 3181 * We need to account for all the leadup data and trailer data 3182 * around the transaction data. 3183 * And then we need to account for the worst case in terms of using 3184 * more space. 3185 * The worst case will happen if: 3186 * - the placement of the transaction happens to be such that the 3187 * roundoff is at its maximum 3188 * - the transaction data is synced before the commit record is synced 3189 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> 3190 * Therefore the commit record is in its own Log Record. 3191 * This can happen as the commit record is called with its 3192 * own region to xlog_write(). 3193 * This then means that in the worst case, roundoff can happen for 3194 * the commit-rec as well. 3195 * The commit-rec is smaller than padding in this scenario and so it is 3196 * not added separately. 3197 */ 3198 3199 /* for trans header */ 3200 unit_bytes += sizeof(xlog_op_header_t); 3201 unit_bytes += sizeof(xfs_trans_header_t); 3202 3203 /* for start-rec */ 3204 unit_bytes += sizeof(xlog_op_header_t); 3205 3206 /* for LR headers */ 3207 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); 3208 unit_bytes += log->l_iclog_hsize * num_headers; 3209 3210 /* for commit-rec LR header - note: padding will subsume the ophdr */ 3211 unit_bytes += log->l_iclog_hsize; 3212 3213 /* for split-recs - ophdrs added when data split over LRs */ 3214 unit_bytes += sizeof(xlog_op_header_t) * num_headers; 3215 3216 /* for roundoff padding for transaction data and one for commit record */ 3217 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && 3218 log->l_mp->m_sb.sb_logsunit > 1) { 3219 /* log su roundoff */ 3220 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; 3221 } else { 3222 /* BB roundoff */ 3223 unit_bytes += 2*BBSIZE; 3224 } 3225 3226 atomic_set(&tic->t_ref, 1); 3227 tic->t_unit_res = unit_bytes; 3228 tic->t_curr_res = unit_bytes; 3229 tic->t_cnt = cnt; 3230 tic->t_ocnt = cnt; 3231 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); 3232 tic->t_clientid = client; 3233 tic->t_flags = XLOG_TIC_INITED; 3234 tic->t_trans_type = 0; 3235 if (xflags & XFS_LOG_PERM_RESERV) 3236 tic->t_flags |= XLOG_TIC_PERM_RESERV; 3237 sv_init(&(tic->t_wait), SV_DEFAULT, "logtick"); 3238 3239 xlog_tic_reset_res(tic); 3240 3241 return tic; 3242 } 3243 3244 3245 /****************************************************************************** 3246 * 3247 * Log debug routines 3248 * 3249 ****************************************************************************** 3250 */ 3251 #if defined(DEBUG) 3252 /* 3253 * Make sure that the destination ptr is within the valid data region of 3254 * one of the iclogs. This uses backup pointers stored in a different 3255 * part of the log in case we trash the log structure. 3256 */ 3257 void 3258 xlog_verify_dest_ptr(xlog_t *log, 3259 __psint_t ptr) 3260 { 3261 int i; 3262 int good_ptr = 0; 3263 3264 for (i=0; i < log->l_iclog_bufs; i++) { 3265 if (ptr >= (__psint_t)log->l_iclog_bak[i] && 3266 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) 3267 good_ptr++; 3268 } 3269 if (! good_ptr) 3270 xlog_panic("xlog_verify_dest_ptr: invalid ptr"); 3271 } /* xlog_verify_dest_ptr */ 3272 3273 STATIC void 3274 xlog_verify_grant_head(xlog_t *log, int equals) 3275 { 3276 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { 3277 if (equals) 3278 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); 3279 else 3280 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); 3281 } else { 3282 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); 3283 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); 3284 } 3285 } /* xlog_verify_grant_head */ 3286 3287 /* check if it will fit */ 3288 STATIC void 3289 xlog_verify_tail_lsn(xlog_t *log, 3290 xlog_in_core_t *iclog, 3291 xfs_lsn_t tail_lsn) 3292 { 3293 int blocks; 3294 3295 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { 3296 blocks = 3297 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); 3298 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) 3299 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3300 } else { 3301 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); 3302 3303 if (BLOCK_LSN(tail_lsn) == log->l_prev_block) 3304 xlog_panic("xlog_verify_tail_lsn: tail wrapped"); 3305 3306 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; 3307 if (blocks < BTOBB(iclog->ic_offset) + 1) 3308 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3309 } 3310 } /* xlog_verify_tail_lsn */ 3311 3312 /* 3313 * Perform a number of checks on the iclog before writing to disk. 3314 * 3315 * 1. Make sure the iclogs are still circular 3316 * 2. Make sure we have a good magic number 3317 * 3. Make sure we don't have magic numbers in the data 3318 * 4. Check fields of each log operation header for: 3319 * A. Valid client identifier 3320 * B. tid ptr value falls in valid ptr space (user space code) 3321 * C. Length in log record header is correct according to the 3322 * individual operation headers within record. 3323 * 5. When a bwrite will occur within 5 blocks of the front of the physical 3324 * log, check the preceding blocks of the physical log to make sure all 3325 * the cycle numbers agree with the current cycle number. 3326 */ 3327 STATIC void 3328 xlog_verify_iclog(xlog_t *log, 3329 xlog_in_core_t *iclog, 3330 int count, 3331 boolean_t syncing) 3332 { 3333 xlog_op_header_t *ophead; 3334 xlog_in_core_t *icptr; 3335 xlog_in_core_2_t *xhdr; 3336 xfs_caddr_t ptr; 3337 xfs_caddr_t base_ptr; 3338 __psint_t field_offset; 3339 __uint8_t clientid; 3340 int len, i, j, k, op_len; 3341 int idx; 3342 3343 /* check validity of iclog pointers */ 3344 spin_lock(&log->l_icloglock); 3345 icptr = log->l_iclog; 3346 for (i=0; i < log->l_iclog_bufs; i++) { 3347 if (icptr == NULL) 3348 xlog_panic("xlog_verify_iclog: invalid ptr"); 3349 icptr = icptr->ic_next; 3350 } 3351 if (icptr != log->l_iclog) 3352 xlog_panic("xlog_verify_iclog: corrupt iclog ring"); 3353 spin_unlock(&log->l_icloglock); 3354 3355 /* check log magic numbers */ 3356 if (be32_to_cpu(iclog->ic_header.h_magicno) != XLOG_HEADER_MAGIC_NUM) 3357 xlog_panic("xlog_verify_iclog: invalid magic num"); 3358 3359 ptr = (xfs_caddr_t) &iclog->ic_header; 3360 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; 3361 ptr += BBSIZE) { 3362 if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM) 3363 xlog_panic("xlog_verify_iclog: unexpected magic num"); 3364 } 3365 3366 /* check fields */ 3367 len = be32_to_cpu(iclog->ic_header.h_num_logops); 3368 ptr = iclog->ic_datap; 3369 base_ptr = ptr; 3370 ophead = (xlog_op_header_t *)ptr; 3371 xhdr = iclog->ic_data; 3372 for (i = 0; i < len; i++) { 3373 ophead = (xlog_op_header_t *)ptr; 3374 3375 /* clientid is only 1 byte */ 3376 field_offset = (__psint_t) 3377 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); 3378 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3379 clientid = ophead->oh_clientid; 3380 } else { 3381 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); 3382 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3383 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3384 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3385 clientid = xlog_get_client_id( 3386 xhdr[j].hic_xheader.xh_cycle_data[k]); 3387 } else { 3388 clientid = xlog_get_client_id( 3389 iclog->ic_header.h_cycle_data[idx]); 3390 } 3391 } 3392 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) 3393 cmn_err(CE_WARN, "xlog_verify_iclog: " 3394 "invalid clientid %d op 0x%p offset 0x%lx", 3395 clientid, ophead, (unsigned long)field_offset); 3396 3397 /* check length */ 3398 field_offset = (__psint_t) 3399 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); 3400 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3401 op_len = be32_to_cpu(ophead->oh_len); 3402 } else { 3403 idx = BTOBBT((__psint_t)&ophead->oh_len - 3404 (__psint_t)iclog->ic_datap); 3405 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3406 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3407 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3408 op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); 3409 } else { 3410 op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); 3411 } 3412 } 3413 ptr += sizeof(xlog_op_header_t) + op_len; 3414 } 3415 } /* xlog_verify_iclog */ 3416 #endif 3417 3418 /* 3419 * Mark all iclogs IOERROR. l_icloglock is held by the caller. 3420 */ 3421 STATIC int 3422 xlog_state_ioerror( 3423 xlog_t *log) 3424 { 3425 xlog_in_core_t *iclog, *ic; 3426 3427 iclog = log->l_iclog; 3428 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { 3429 /* 3430 * Mark all the incore logs IOERROR. 3431 * From now on, no log flushes will result. 3432 */ 3433 ic = iclog; 3434 do { 3435 ic->ic_state = XLOG_STATE_IOERROR; 3436 ic = ic->ic_next; 3437 } while (ic != iclog); 3438 return 0; 3439 } 3440 /* 3441 * Return non-zero, if state transition has already happened. 3442 */ 3443 return 1; 3444 } 3445 3446 /* 3447 * This is called from xfs_force_shutdown, when we're forcibly 3448 * shutting down the filesystem, typically because of an IO error. 3449 * Our main objectives here are to make sure that: 3450 * a. the filesystem gets marked 'SHUTDOWN' for all interested 3451 * parties to find out, 'atomically'. 3452 * b. those who're sleeping on log reservations, pinned objects and 3453 * other resources get woken up, and be told the bad news. 3454 * c. nothing new gets queued up after (a) and (b) are done. 3455 * d. if !logerror, flush the iclogs to disk, then seal them off 3456 * for business. 3457 */ 3458 int 3459 xfs_log_force_umount( 3460 struct xfs_mount *mp, 3461 int logerror) 3462 { 3463 xlog_ticket_t *tic; 3464 xlog_t *log; 3465 int retval; 3466 int dummy; 3467 3468 log = mp->m_log; 3469 3470 /* 3471 * If this happens during log recovery, don't worry about 3472 * locking; the log isn't open for business yet. 3473 */ 3474 if (!log || 3475 log->l_flags & XLOG_ACTIVE_RECOVERY) { 3476 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3477 if (mp->m_sb_bp) 3478 XFS_BUF_DONE(mp->m_sb_bp); 3479 return 0; 3480 } 3481 3482 /* 3483 * Somebody could've already done the hard work for us. 3484 * No need to get locks for this. 3485 */ 3486 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { 3487 ASSERT(XLOG_FORCED_SHUTDOWN(log)); 3488 return 1; 3489 } 3490 retval = 0; 3491 /* 3492 * We must hold both the GRANT lock and the LOG lock, 3493 * before we mark the filesystem SHUTDOWN and wake 3494 * everybody up to tell the bad news. 3495 */ 3496 spin_lock(&log->l_icloglock); 3497 spin_lock(&log->l_grant_lock); 3498 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3499 if (mp->m_sb_bp) 3500 XFS_BUF_DONE(mp->m_sb_bp); 3501 3502 /* 3503 * This flag is sort of redundant because of the mount flag, but 3504 * it's good to maintain the separation between the log and the rest 3505 * of XFS. 3506 */ 3507 log->l_flags |= XLOG_IO_ERROR; 3508 3509 /* 3510 * If we hit a log error, we want to mark all the iclogs IOERROR 3511 * while we're still holding the loglock. 3512 */ 3513 if (logerror) 3514 retval = xlog_state_ioerror(log); 3515 spin_unlock(&log->l_icloglock); 3516 3517 /* 3518 * We don't want anybody waiting for log reservations 3519 * after this. That means we have to wake up everybody 3520 * queued up on reserve_headq as well as write_headq. 3521 * In addition, we make sure in xlog_{re}grant_log_space 3522 * that we don't enqueue anything once the SHUTDOWN flag 3523 * is set, and this action is protected by the GRANTLOCK. 3524 */ 3525 if ((tic = log->l_reserve_headq)) { 3526 do { 3527 sv_signal(&tic->t_wait); 3528 tic = tic->t_next; 3529 } while (tic != log->l_reserve_headq); 3530 } 3531 3532 if ((tic = log->l_write_headq)) { 3533 do { 3534 sv_signal(&tic->t_wait); 3535 tic = tic->t_next; 3536 } while (tic != log->l_write_headq); 3537 } 3538 spin_unlock(&log->l_grant_lock); 3539 3540 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { 3541 ASSERT(!logerror); 3542 /* 3543 * Force the incore logs to disk before shutting the 3544 * log down completely. 3545 */ 3546 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy); 3547 spin_lock(&log->l_icloglock); 3548 retval = xlog_state_ioerror(log); 3549 spin_unlock(&log->l_icloglock); 3550 } 3551 /* 3552 * Wake up everybody waiting on xfs_log_force. 3553 * Callback all log item committed functions as if the 3554 * log writes were completed. 3555 */ 3556 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); 3557 3558 #ifdef XFSERRORDEBUG 3559 { 3560 xlog_in_core_t *iclog; 3561 3562 spin_lock(&log->l_icloglock); 3563 iclog = log->l_iclog; 3564 do { 3565 ASSERT(iclog->ic_callback == 0); 3566 iclog = iclog->ic_next; 3567 } while (iclog != log->l_iclog); 3568 spin_unlock(&log->l_icloglock); 3569 } 3570 #endif 3571 /* return non-zero if log IOERROR transition had already happened */ 3572 return retval; 3573 } 3574 3575 STATIC int 3576 xlog_iclogs_empty(xlog_t *log) 3577 { 3578 xlog_in_core_t *iclog; 3579 3580 iclog = log->l_iclog; 3581 do { 3582 /* endianness does not matter here, zero is zero in 3583 * any language. 3584 */ 3585 if (iclog->ic_header.h_num_logops) 3586 return 0; 3587 iclog = iclog->ic_next; 3588 } while (iclog != log->l_iclog); 3589 return 1; 3590 } 3591