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_dir.h" 28 #include "xfs_dir2.h" 29 #include "xfs_dmapi.h" 30 #include "xfs_mount.h" 31 #include "xfs_error.h" 32 #include "xfs_log_priv.h" 33 #include "xfs_buf_item.h" 34 #include "xfs_bmap_btree.h" 35 #include "xfs_alloc_btree.h" 36 #include "xfs_ialloc_btree.h" 37 #include "xfs_log_recover.h" 38 #include "xfs_trans_priv.h" 39 #include "xfs_dir_sf.h" 40 #include "xfs_dir2_sf.h" 41 #include "xfs_attr_sf.h" 42 #include "xfs_dinode.h" 43 #include "xfs_inode.h" 44 #include "xfs_rw.h" 45 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_unalloc_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 void xlog_state_put_ticket(xlog_t *log, 79 xlog_ticket_t *tic); 80 STATIC int xlog_state_release_iclog(xlog_t *log, 81 xlog_in_core_t *iclog); 82 STATIC void xlog_state_switch_iclogs(xlog_t *log, 83 xlog_in_core_t *iclog, 84 int eventual_size); 85 STATIC int xlog_state_sync(xlog_t *log, 86 xfs_lsn_t lsn, 87 uint flags, 88 int *log_flushed); 89 STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed); 90 STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); 91 92 /* local functions to manipulate grant head */ 93 STATIC int xlog_grant_log_space(xlog_t *log, 94 xlog_ticket_t *xtic); 95 STATIC void xlog_grant_push_ail(xfs_mount_t *mp, 96 int need_bytes); 97 STATIC void xlog_regrant_reserve_log_space(xlog_t *log, 98 xlog_ticket_t *ticket); 99 STATIC int xlog_regrant_write_log_space(xlog_t *log, 100 xlog_ticket_t *ticket); 101 STATIC void xlog_ungrant_log_space(xlog_t *log, 102 xlog_ticket_t *ticket); 103 104 105 /* local ticket functions */ 106 STATIC void xlog_state_ticket_alloc(xlog_t *log); 107 STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log, 108 int unit_bytes, 109 int count, 110 char clientid, 111 uint flags); 112 STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket); 113 114 #if defined(DEBUG) 115 STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); 116 STATIC void xlog_verify_grant_head(xlog_t *log, int equals); 117 STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, 118 int count, boolean_t syncing); 119 STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, 120 xfs_lsn_t tail_lsn); 121 #else 122 #define xlog_verify_dest_ptr(a,b) 123 #define xlog_verify_grant_head(a,b) 124 #define xlog_verify_iclog(a,b,c,d) 125 #define xlog_verify_tail_lsn(a,b,c) 126 #endif 127 128 STATIC int xlog_iclogs_empty(xlog_t *log); 129 130 #if defined(XFS_LOG_TRACE) 131 void 132 xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string) 133 { 134 unsigned long cnts; 135 136 if (!log->l_grant_trace) { 137 log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP); 138 if (!log->l_grant_trace) 139 return; 140 } 141 /* ticket counts are 1 byte each */ 142 cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8; 143 144 ktrace_enter(log->l_grant_trace, 145 (void *)tic, 146 (void *)log->l_reserve_headq, 147 (void *)log->l_write_headq, 148 (void *)((unsigned long)log->l_grant_reserve_cycle), 149 (void *)((unsigned long)log->l_grant_reserve_bytes), 150 (void *)((unsigned long)log->l_grant_write_cycle), 151 (void *)((unsigned long)log->l_grant_write_bytes), 152 (void *)((unsigned long)log->l_curr_cycle), 153 (void *)((unsigned long)log->l_curr_block), 154 (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)), 155 (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)), 156 (void *)string, 157 (void *)((unsigned long)tic->t_trans_type), 158 (void *)cnts, 159 (void *)((unsigned long)tic->t_curr_res), 160 (void *)((unsigned long)tic->t_unit_res)); 161 } 162 163 void 164 xlog_trace_iclog(xlog_in_core_t *iclog, uint state) 165 { 166 if (!iclog->ic_trace) 167 iclog->ic_trace = ktrace_alloc(256, KM_SLEEP); 168 ktrace_enter(iclog->ic_trace, 169 (void *)((unsigned long)state), 170 (void *)((unsigned long)current_pid()), 171 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, 172 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, 173 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, 174 (void *)NULL, (void *)NULL); 175 } 176 #else 177 #define xlog_trace_loggrant(log,tic,string) 178 #define xlog_trace_iclog(iclog,state) 179 #endif /* XFS_LOG_TRACE */ 180 181 /* 182 * NOTES: 183 * 184 * 1. currblock field gets updated at startup and after in-core logs 185 * marked as with WANT_SYNC. 186 */ 187 188 /* 189 * This routine is called when a user of a log manager ticket is done with 190 * the reservation. If the ticket was ever used, then a commit record for 191 * the associated transaction is written out as a log operation header with 192 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with 193 * a given ticket. If the ticket was one with a permanent reservation, then 194 * a few operations are done differently. Permanent reservation tickets by 195 * default don't release the reservation. They just commit the current 196 * transaction with the belief that the reservation is still needed. A flag 197 * must be passed in before permanent reservations are actually released. 198 * When these type of tickets are not released, they need to be set into 199 * the inited state again. By doing this, a start record will be written 200 * out when the next write occurs. 201 */ 202 xfs_lsn_t 203 xfs_log_done(xfs_mount_t *mp, 204 xfs_log_ticket_t xtic, 205 void **iclog, 206 uint flags) 207 { 208 xlog_t *log = mp->m_log; 209 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; 210 xfs_lsn_t lsn = 0; 211 212 if (XLOG_FORCED_SHUTDOWN(log) || 213 /* 214 * If nothing was ever written, don't write out commit record. 215 * If we get an error, just continue and give back the log ticket. 216 */ 217 (((ticket->t_flags & XLOG_TIC_INITED) == 0) && 218 (xlog_commit_record(mp, ticket, 219 (xlog_in_core_t **)iclog, &lsn)))) { 220 lsn = (xfs_lsn_t) -1; 221 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { 222 flags |= XFS_LOG_REL_PERM_RESERV; 223 } 224 } 225 226 227 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || 228 (flags & XFS_LOG_REL_PERM_RESERV)) { 229 /* 230 * Release ticket if not permanent reservation or a specifc 231 * request has been made to release a permanent reservation. 232 */ 233 xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)"); 234 xlog_ungrant_log_space(log, ticket); 235 xlog_state_put_ticket(log, ticket); 236 } else { 237 xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)"); 238 xlog_regrant_reserve_log_space(log, ticket); 239 } 240 241 /* If this ticket was a permanent reservation and we aren't 242 * trying to release it, reset the inited flags; so next time 243 * we write, a start record will be written out. 244 */ 245 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) && 246 (flags & XFS_LOG_REL_PERM_RESERV) == 0) 247 ticket->t_flags |= XLOG_TIC_INITED; 248 249 return lsn; 250 } /* xfs_log_done */ 251 252 253 /* 254 * Force the in-core log to disk. If flags == XFS_LOG_SYNC, 255 * the force is done synchronously. 256 * 257 * Asynchronous forces are implemented by setting the WANT_SYNC 258 * bit in the appropriate in-core log and then returning. 259 * 260 * Synchronous forces are implemented with a semaphore. All callers 261 * to force a given lsn to disk will wait on a semaphore attached to the 262 * specific in-core log. When given in-core log finally completes its 263 * write to disk, that thread will wake up all threads waiting on the 264 * semaphore. 265 */ 266 int 267 _xfs_log_force( 268 xfs_mount_t *mp, 269 xfs_lsn_t lsn, 270 uint flags, 271 int *log_flushed) 272 { 273 xlog_t *log = mp->m_log; 274 int dummy; 275 276 if (!log_flushed) 277 log_flushed = &dummy; 278 279 ASSERT(flags & XFS_LOG_FORCE); 280 281 XFS_STATS_INC(xs_log_force); 282 283 if (log->l_flags & XLOG_IO_ERROR) 284 return XFS_ERROR(EIO); 285 if (lsn == 0) 286 return xlog_state_sync_all(log, flags, log_flushed); 287 else 288 return xlog_state_sync(log, lsn, flags, log_flushed); 289 } /* xfs_log_force */ 290 291 /* 292 * Attaches a new iclog I/O completion callback routine during 293 * transaction commit. If the log is in error state, a non-zero 294 * return code is handed back and the caller is responsible for 295 * executing the callback at an appropriate time. 296 */ 297 int 298 xfs_log_notify(xfs_mount_t *mp, /* mount of partition */ 299 void *iclog_hndl, /* iclog to hang callback off */ 300 xfs_log_callback_t *cb) 301 { 302 xlog_t *log = mp->m_log; 303 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 304 int abortflg, spl; 305 306 cb->cb_next = NULL; 307 spl = LOG_LOCK(log); 308 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); 309 if (!abortflg) { 310 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || 311 (iclog->ic_state == XLOG_STATE_WANT_SYNC)); 312 cb->cb_next = NULL; 313 *(iclog->ic_callback_tail) = cb; 314 iclog->ic_callback_tail = &(cb->cb_next); 315 } 316 LOG_UNLOCK(log, spl); 317 return abortflg; 318 } /* xfs_log_notify */ 319 320 int 321 xfs_log_release_iclog(xfs_mount_t *mp, 322 void *iclog_hndl) 323 { 324 xlog_t *log = mp->m_log; 325 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 326 327 if (xlog_state_release_iclog(log, iclog)) { 328 xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); 329 return(EIO); 330 } 331 332 return 0; 333 } 334 335 /* 336 * 1. Reserve an amount of on-disk log space and return a ticket corresponding 337 * to the reservation. 338 * 2. Potentially, push buffers at tail of log to disk. 339 * 340 * Each reservation is going to reserve extra space for a log record header. 341 * When writes happen to the on-disk log, we don't subtract the length of the 342 * log record header from any reservation. By wasting space in each 343 * reservation, we prevent over allocation problems. 344 */ 345 int 346 xfs_log_reserve(xfs_mount_t *mp, 347 int unit_bytes, 348 int cnt, 349 xfs_log_ticket_t *ticket, 350 __uint8_t client, 351 uint flags, 352 uint t_type) 353 { 354 xlog_t *log = mp->m_log; 355 xlog_ticket_t *internal_ticket; 356 int retval = 0; 357 358 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); 359 ASSERT((flags & XFS_LOG_NOSLEEP) == 0); 360 361 if (XLOG_FORCED_SHUTDOWN(log)) 362 return XFS_ERROR(EIO); 363 364 XFS_STATS_INC(xs_try_logspace); 365 366 if (*ticket != NULL) { 367 ASSERT(flags & XFS_LOG_PERM_RESERV); 368 internal_ticket = (xlog_ticket_t *)*ticket; 369 xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)"); 370 xlog_grant_push_ail(mp, internal_ticket->t_unit_res); 371 retval = xlog_regrant_write_log_space(log, internal_ticket); 372 } else { 373 /* may sleep if need to allocate more tickets */ 374 internal_ticket = xlog_ticket_get(log, unit_bytes, cnt, 375 client, flags); 376 internal_ticket->t_trans_type = t_type; 377 *ticket = internal_ticket; 378 xlog_trace_loggrant(log, internal_ticket, 379 (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ? 380 "xfs_log_reserve: create new ticket (permanent trans)" : 381 "xfs_log_reserve: create new ticket"); 382 xlog_grant_push_ail(mp, 383 (internal_ticket->t_unit_res * 384 internal_ticket->t_cnt)); 385 retval = xlog_grant_log_space(log, internal_ticket); 386 } 387 388 return retval; 389 } /* xfs_log_reserve */ 390 391 392 /* 393 * Mount a log filesystem 394 * 395 * mp - ubiquitous xfs mount point structure 396 * log_target - buftarg of on-disk log device 397 * blk_offset - Start block # where block size is 512 bytes (BBSIZE) 398 * num_bblocks - Number of BBSIZE blocks in on-disk log 399 * 400 * Return error or zero. 401 */ 402 int 403 xfs_log_mount(xfs_mount_t *mp, 404 xfs_buftarg_t *log_target, 405 xfs_daddr_t blk_offset, 406 int num_bblks) 407 { 408 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 409 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); 410 else { 411 cmn_err(CE_NOTE, 412 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", 413 mp->m_fsname); 414 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); 415 } 416 417 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); 418 419 /* 420 * skip log recovery on a norecovery mount. pretend it all 421 * just worked. 422 */ 423 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { 424 int error; 425 vfs_t *vfsp = XFS_MTOVFS(mp); 426 int readonly = (vfsp->vfs_flag & VFS_RDONLY); 427 428 if (readonly) 429 vfsp->vfs_flag &= ~VFS_RDONLY; 430 431 error = xlog_recover(mp->m_log, readonly); 432 433 if (readonly) 434 vfsp->vfs_flag |= VFS_RDONLY; 435 if (error) { 436 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); 437 xlog_unalloc_log(mp->m_log); 438 return error; 439 } 440 } 441 442 /* Normal transactions can now occur */ 443 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; 444 445 /* End mounting message in xfs_log_mount_finish */ 446 return 0; 447 } /* xfs_log_mount */ 448 449 /* 450 * Finish the recovery of the file system. This is separate from 451 * the xfs_log_mount() call, because it depends on the code in 452 * xfs_mountfs() to read in the root and real-time bitmap inodes 453 * between calling xfs_log_mount() and here. 454 * 455 * mp - ubiquitous xfs mount point structure 456 */ 457 int 458 xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags) 459 { 460 int error; 461 462 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 463 error = xlog_recover_finish(mp->m_log, mfsi_flags); 464 else { 465 error = 0; 466 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); 467 } 468 469 return error; 470 } 471 472 /* 473 * Unmount processing for the log. 474 */ 475 int 476 xfs_log_unmount(xfs_mount_t *mp) 477 { 478 int error; 479 480 error = xfs_log_unmount_write(mp); 481 xfs_log_unmount_dealloc(mp); 482 return (error); 483 } 484 485 /* 486 * Final log writes as part of unmount. 487 * 488 * Mark the filesystem clean as unmount happens. Note that during relocation 489 * this routine needs to be executed as part of source-bag while the 490 * deallocation must not be done until source-end. 491 */ 492 493 /* 494 * Unmount record used to have a string "Unmount filesystem--" in the 495 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). 496 * We just write the magic number now since that particular field isn't 497 * currently architecture converted and "nUmount" is a bit foo. 498 * As far as I know, there weren't any dependencies on the old behaviour. 499 */ 500 501 int 502 xfs_log_unmount_write(xfs_mount_t *mp) 503 { 504 xlog_t *log = mp->m_log; 505 xlog_in_core_t *iclog; 506 #ifdef DEBUG 507 xlog_in_core_t *first_iclog; 508 #endif 509 xfs_log_iovec_t reg[1]; 510 xfs_log_ticket_t tic = NULL; 511 xfs_lsn_t lsn; 512 int error; 513 SPLDECL(s); 514 515 /* the data section must be 32 bit size aligned */ 516 struct { 517 __uint16_t magic; 518 __uint16_t pad1; 519 __uint32_t pad2; /* may as well make it 64 bits */ 520 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; 521 522 /* 523 * Don't write out unmount record on read-only mounts. 524 * Or, if we are doing a forced umount (typically because of IO errors). 525 */ 526 if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY) 527 return 0; 528 529 xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC); 530 531 #ifdef DEBUG 532 first_iclog = iclog = log->l_iclog; 533 do { 534 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 535 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); 536 ASSERT(iclog->ic_offset == 0); 537 } 538 iclog = iclog->ic_next; 539 } while (iclog != first_iclog); 540 #endif 541 if (! (XLOG_FORCED_SHUTDOWN(log))) { 542 reg[0].i_addr = (void*)&magic; 543 reg[0].i_len = sizeof(magic); 544 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT); 545 546 error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0, 0); 547 if (!error) { 548 /* remove inited flag */ 549 ((xlog_ticket_t *)tic)->t_flags = 0; 550 error = xlog_write(mp, reg, 1, tic, &lsn, 551 NULL, XLOG_UNMOUNT_TRANS); 552 /* 553 * At this point, we're umounting anyway, 554 * so there's no point in transitioning log state 555 * to IOERROR. Just continue... 556 */ 557 } 558 559 if (error) { 560 xfs_fs_cmn_err(CE_ALERT, mp, 561 "xfs_log_unmount: unmount record failed"); 562 } 563 564 565 s = LOG_LOCK(log); 566 iclog = log->l_iclog; 567 iclog->ic_refcnt++; 568 LOG_UNLOCK(log, s); 569 xlog_state_want_sync(log, iclog); 570 (void) xlog_state_release_iclog(log, iclog); 571 572 s = LOG_LOCK(log); 573 if (!(iclog->ic_state == XLOG_STATE_ACTIVE || 574 iclog->ic_state == XLOG_STATE_DIRTY)) { 575 if (!XLOG_FORCED_SHUTDOWN(log)) { 576 sv_wait(&iclog->ic_forcesema, PMEM, 577 &log->l_icloglock, s); 578 } else { 579 LOG_UNLOCK(log, s); 580 } 581 } else { 582 LOG_UNLOCK(log, s); 583 } 584 if (tic) 585 xlog_state_put_ticket(log, tic); 586 } else { 587 /* 588 * We're already in forced_shutdown mode, couldn't 589 * even attempt to write out the unmount transaction. 590 * 591 * Go through the motions of sync'ing and releasing 592 * the iclog, even though no I/O will actually happen, 593 * we need to wait for other log I/O's that may already 594 * be in progress. Do this as a separate section of 595 * code so we'll know if we ever get stuck here that 596 * we're in this odd situation of trying to unmount 597 * a file system that went into forced_shutdown as 598 * the result of an unmount.. 599 */ 600 s = LOG_LOCK(log); 601 iclog = log->l_iclog; 602 iclog->ic_refcnt++; 603 LOG_UNLOCK(log, s); 604 605 xlog_state_want_sync(log, iclog); 606 (void) xlog_state_release_iclog(log, iclog); 607 608 s = LOG_LOCK(log); 609 610 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE 611 || iclog->ic_state == XLOG_STATE_DIRTY 612 || iclog->ic_state == XLOG_STATE_IOERROR) ) { 613 614 sv_wait(&iclog->ic_forcesema, PMEM, 615 &log->l_icloglock, s); 616 } else { 617 LOG_UNLOCK(log, s); 618 } 619 } 620 621 return 0; 622 } /* xfs_log_unmount_write */ 623 624 /* 625 * Deallocate log structures for unmount/relocation. 626 */ 627 void 628 xfs_log_unmount_dealloc(xfs_mount_t *mp) 629 { 630 xlog_unalloc_log(mp->m_log); 631 } 632 633 /* 634 * Write region vectors to log. The write happens using the space reservation 635 * of the ticket (tic). It is not a requirement that all writes for a given 636 * transaction occur with one call to xfs_log_write(). 637 */ 638 int 639 xfs_log_write(xfs_mount_t * mp, 640 xfs_log_iovec_t reg[], 641 int nentries, 642 xfs_log_ticket_t tic, 643 xfs_lsn_t *start_lsn) 644 { 645 int error; 646 xlog_t *log = mp->m_log; 647 648 if (XLOG_FORCED_SHUTDOWN(log)) 649 return XFS_ERROR(EIO); 650 651 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { 652 xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); 653 } 654 return (error); 655 } /* xfs_log_write */ 656 657 658 void 659 xfs_log_move_tail(xfs_mount_t *mp, 660 xfs_lsn_t tail_lsn) 661 { 662 xlog_ticket_t *tic; 663 xlog_t *log = mp->m_log; 664 int need_bytes, free_bytes, cycle, bytes; 665 SPLDECL(s); 666 667 if (XLOG_FORCED_SHUTDOWN(log)) 668 return; 669 ASSERT(!XFS_FORCED_SHUTDOWN(mp)); 670 671 if (tail_lsn == 0) { 672 /* needed since sync_lsn is 64 bits */ 673 s = LOG_LOCK(log); 674 tail_lsn = log->l_last_sync_lsn; 675 LOG_UNLOCK(log, s); 676 } 677 678 s = GRANT_LOCK(log); 679 680 /* Also an invalid lsn. 1 implies that we aren't passing in a valid 681 * tail_lsn. 682 */ 683 if (tail_lsn != 1) { 684 log->l_tail_lsn = tail_lsn; 685 } 686 687 if ((tic = log->l_write_headq)) { 688 #ifdef DEBUG 689 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 690 panic("Recovery problem"); 691 #endif 692 cycle = log->l_grant_write_cycle; 693 bytes = log->l_grant_write_bytes; 694 free_bytes = xlog_space_left(log, cycle, bytes); 695 do { 696 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); 697 698 if (free_bytes < tic->t_unit_res && tail_lsn != 1) 699 break; 700 tail_lsn = 0; 701 free_bytes -= tic->t_unit_res; 702 sv_signal(&tic->t_sema); 703 tic = tic->t_next; 704 } while (tic != log->l_write_headq); 705 } 706 if ((tic = log->l_reserve_headq)) { 707 #ifdef DEBUG 708 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 709 panic("Recovery problem"); 710 #endif 711 cycle = log->l_grant_reserve_cycle; 712 bytes = log->l_grant_reserve_bytes; 713 free_bytes = xlog_space_left(log, cycle, bytes); 714 do { 715 if (tic->t_flags & XLOG_TIC_PERM_RESERV) 716 need_bytes = tic->t_unit_res*tic->t_cnt; 717 else 718 need_bytes = tic->t_unit_res; 719 if (free_bytes < need_bytes && tail_lsn != 1) 720 break; 721 tail_lsn = 0; 722 free_bytes -= need_bytes; 723 sv_signal(&tic->t_sema); 724 tic = tic->t_next; 725 } while (tic != log->l_reserve_headq); 726 } 727 GRANT_UNLOCK(log, s); 728 } /* xfs_log_move_tail */ 729 730 /* 731 * Determine if we have a transaction that has gone to disk 732 * that needs to be covered. Log activity needs to be idle (no AIL and 733 * nothing in the iclogs). And, we need to be in the right state indicating 734 * something has gone out. 735 */ 736 int 737 xfs_log_need_covered(xfs_mount_t *mp) 738 { 739 SPLDECL(s); 740 int needed = 0, gen; 741 xlog_t *log = mp->m_log; 742 vfs_t *vfsp = XFS_MTOVFS(mp); 743 744 if (fs_frozen(vfsp) || XFS_FORCED_SHUTDOWN(mp) || 745 (vfsp->vfs_flag & VFS_RDONLY)) 746 return 0; 747 748 s = LOG_LOCK(log); 749 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || 750 (log->l_covered_state == XLOG_STATE_COVER_NEED2)) 751 && !xfs_trans_first_ail(mp, &gen) 752 && xlog_iclogs_empty(log)) { 753 if (log->l_covered_state == XLOG_STATE_COVER_NEED) 754 log->l_covered_state = XLOG_STATE_COVER_DONE; 755 else { 756 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); 757 log->l_covered_state = XLOG_STATE_COVER_DONE2; 758 } 759 needed = 1; 760 } 761 LOG_UNLOCK(log, s); 762 return(needed); 763 } 764 765 /****************************************************************************** 766 * 767 * local routines 768 * 769 ****************************************************************************** 770 */ 771 772 /* xfs_trans_tail_ail returns 0 when there is nothing in the list. 773 * The log manager must keep track of the last LR which was committed 774 * to disk. The lsn of this LR will become the new tail_lsn whenever 775 * xfs_trans_tail_ail returns 0. If we don't do this, we run into 776 * the situation where stuff could be written into the log but nothing 777 * was ever in the AIL when asked. Eventually, we panic since the 778 * tail hits the head. 779 * 780 * We may be holding the log iclog lock upon entering this routine. 781 */ 782 xfs_lsn_t 783 xlog_assign_tail_lsn(xfs_mount_t *mp) 784 { 785 xfs_lsn_t tail_lsn; 786 SPLDECL(s); 787 xlog_t *log = mp->m_log; 788 789 tail_lsn = xfs_trans_tail_ail(mp); 790 s = GRANT_LOCK(log); 791 if (tail_lsn != 0) { 792 log->l_tail_lsn = tail_lsn; 793 } else { 794 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; 795 } 796 GRANT_UNLOCK(log, s); 797 798 return tail_lsn; 799 } /* xlog_assign_tail_lsn */ 800 801 802 /* 803 * Return the space in the log between the tail and the head. The head 804 * is passed in the cycle/bytes formal parms. In the special case where 805 * the reserve head has wrapped passed the tail, this calculation is no 806 * longer valid. In this case, just return 0 which means there is no space 807 * in the log. This works for all places where this function is called 808 * with the reserve head. Of course, if the write head were to ever 809 * wrap the tail, we should blow up. Rather than catch this case here, 810 * we depend on other ASSERTions in other parts of the code. XXXmiken 811 * 812 * This code also handles the case where the reservation head is behind 813 * the tail. The details of this case are described below, but the end 814 * result is that we return the size of the log as the amount of space left. 815 */ 816 int 817 xlog_space_left(xlog_t *log, int cycle, int bytes) 818 { 819 int free_bytes; 820 int tail_bytes; 821 int tail_cycle; 822 823 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); 824 tail_cycle = CYCLE_LSN(log->l_tail_lsn); 825 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { 826 free_bytes = log->l_logsize - (bytes - tail_bytes); 827 } else if ((tail_cycle + 1) < cycle) { 828 return 0; 829 } else if (tail_cycle < cycle) { 830 ASSERT(tail_cycle == (cycle - 1)); 831 free_bytes = tail_bytes - bytes; 832 } else { 833 /* 834 * The reservation head is behind the tail. 835 * In this case we just want to return the size of the 836 * log as the amount of space left. 837 */ 838 xfs_fs_cmn_err(CE_ALERT, log->l_mp, 839 "xlog_space_left: head behind tail\n" 840 " tail_cycle = %d, tail_bytes = %d\n" 841 " GH cycle = %d, GH bytes = %d", 842 tail_cycle, tail_bytes, cycle, bytes); 843 ASSERT(0); 844 free_bytes = log->l_logsize; 845 } 846 return free_bytes; 847 } /* xlog_space_left */ 848 849 850 /* 851 * Log function which is called when an io completes. 852 * 853 * The log manager needs its own routine, in order to control what 854 * happens with the buffer after the write completes. 855 */ 856 void 857 xlog_iodone(xfs_buf_t *bp) 858 { 859 xlog_in_core_t *iclog; 860 xlog_t *l; 861 int aborted; 862 863 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 864 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); 865 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 866 aborted = 0; 867 868 /* 869 * Some versions of cpp barf on the recursive definition of 870 * ic_log -> hic_fields.ic_log and expand ic_log twice when 871 * it is passed through two macros. Workaround broken cpp. 872 */ 873 l = iclog->ic_log; 874 875 /* 876 * Race to shutdown the filesystem if we see an error. 877 */ 878 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, 879 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { 880 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); 881 XFS_BUF_STALE(bp); 882 xfs_force_shutdown(l->l_mp, XFS_LOG_IO_ERROR); 883 /* 884 * This flag will be propagated to the trans-committed 885 * callback routines to let them know that the log-commit 886 * didn't succeed. 887 */ 888 aborted = XFS_LI_ABORTED; 889 } else if (iclog->ic_state & XLOG_STATE_IOERROR) { 890 aborted = XFS_LI_ABORTED; 891 } 892 xlog_state_done_syncing(iclog, aborted); 893 if (!(XFS_BUF_ISASYNC(bp))) { 894 /* 895 * Corresponding psema() will be done in bwrite(). If we don't 896 * vsema() here, panic. 897 */ 898 XFS_BUF_V_IODONESEMA(bp); 899 } 900 } /* xlog_iodone */ 901 902 /* 903 * The bdstrat callback function for log bufs. This gives us a central 904 * place to trap bufs in case we get hit by a log I/O error and need to 905 * shutdown. Actually, in practice, even when we didn't get a log error, 906 * we transition the iclogs to IOERROR state *after* flushing all existing 907 * iclogs to disk. This is because we don't want anymore new transactions to be 908 * started or completed afterwards. 909 */ 910 STATIC int 911 xlog_bdstrat_cb(struct xfs_buf *bp) 912 { 913 xlog_in_core_t *iclog; 914 915 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 916 917 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { 918 /* note for irix bstrat will need struct bdevsw passed 919 * Fix the following macro if the code ever is merged 920 */ 921 XFS_bdstrat(bp); 922 return 0; 923 } 924 925 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); 926 XFS_BUF_ERROR(bp, EIO); 927 XFS_BUF_STALE(bp); 928 xfs_biodone(bp); 929 return (XFS_ERROR(EIO)); 930 931 932 } 933 934 /* 935 * Return size of each in-core log record buffer. 936 * 937 * Low memory machines only get 2 16KB buffers. We don't want to waste 938 * memory here. However, all other machines get at least 2 32KB buffers. 939 * The number is hard coded because we don't care about the minimum 940 * memory size, just 32MB systems. 941 * 942 * If the filesystem blocksize is too large, we may need to choose a 943 * larger size since the directory code currently logs entire blocks. 944 */ 945 946 STATIC void 947 xlog_get_iclog_buffer_size(xfs_mount_t *mp, 948 xlog_t *log) 949 { 950 int size; 951 int xhdrs; 952 953 if (mp->m_logbufs <= 0) { 954 if (xfs_physmem <= btoc(128*1024*1024)) { 955 log->l_iclog_bufs = XLOG_MIN_ICLOGS; 956 } else if (xfs_physmem <= btoc(400*1024*1024)) { 957 log->l_iclog_bufs = XLOG_MED_ICLOGS; 958 } else { /* 256K with 32K bufs */ 959 log->l_iclog_bufs = XLOG_MAX_ICLOGS; 960 } 961 } else { 962 log->l_iclog_bufs = mp->m_logbufs; 963 } 964 965 /* 966 * Buffer size passed in from mount system call. 967 */ 968 if (mp->m_logbsize > 0) { 969 size = log->l_iclog_size = mp->m_logbsize; 970 log->l_iclog_size_log = 0; 971 while (size != 1) { 972 log->l_iclog_size_log++; 973 size >>= 1; 974 } 975 976 if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) { 977 /* # headers = size / 32K 978 * one header holds cycles from 32K of data 979 */ 980 981 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; 982 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) 983 xhdrs++; 984 log->l_iclog_hsize = xhdrs << BBSHIFT; 985 log->l_iclog_heads = xhdrs; 986 } else { 987 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); 988 log->l_iclog_hsize = BBSIZE; 989 log->l_iclog_heads = 1; 990 } 991 goto done; 992 } 993 994 /* 995 * Special case machines that have less than 32MB of memory. 996 * All machines with more memory use 32KB buffers. 997 */ 998 if (xfs_physmem <= btoc(32*1024*1024)) { 999 /* Don't change; min configuration */ 1000 log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */ 1001 log->l_iclog_size_log = XLOG_RECORD_BSHIFT; 1002 } else { 1003 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */ 1004 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1005 } 1006 1007 /* the default log size is 16k or 32k which is one header sector */ 1008 log->l_iclog_hsize = BBSIZE; 1009 log->l_iclog_heads = 1; 1010 1011 /* 1012 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use 1013 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers. 1014 */ 1015 if (mp->m_sb.sb_blocksize >= 16*1024) { 1016 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; 1017 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1018 if (mp->m_logbufs <= 0) { 1019 switch (mp->m_sb.sb_blocksize) { 1020 case 16*1024: /* 16 KB */ 1021 log->l_iclog_bufs = 3; 1022 break; 1023 case 32*1024: /* 32 KB */ 1024 log->l_iclog_bufs = 4; 1025 break; 1026 case 64*1024: /* 64 KB */ 1027 log->l_iclog_bufs = 8; 1028 break; 1029 default: 1030 xlog_panic("XFS: Invalid blocksize"); 1031 break; 1032 } 1033 } 1034 } 1035 1036 done: /* are we being asked to make the sizes selected above visible? */ 1037 if (mp->m_logbufs == 0) 1038 mp->m_logbufs = log->l_iclog_bufs; 1039 if (mp->m_logbsize == 0) 1040 mp->m_logbsize = log->l_iclog_size; 1041 } /* xlog_get_iclog_buffer_size */ 1042 1043 1044 /* 1045 * This routine initializes some of the log structure for a given mount point. 1046 * Its primary purpose is to fill in enough, so recovery can occur. However, 1047 * some other stuff may be filled in too. 1048 */ 1049 STATIC xlog_t * 1050 xlog_alloc_log(xfs_mount_t *mp, 1051 xfs_buftarg_t *log_target, 1052 xfs_daddr_t blk_offset, 1053 int num_bblks) 1054 { 1055 xlog_t *log; 1056 xlog_rec_header_t *head; 1057 xlog_in_core_t **iclogp; 1058 xlog_in_core_t *iclog, *prev_iclog=NULL; 1059 xfs_buf_t *bp; 1060 int i; 1061 int iclogsize; 1062 1063 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP); 1064 1065 log->l_mp = mp; 1066 log->l_targ = log_target; 1067 log->l_logsize = BBTOB(num_bblks); 1068 log->l_logBBstart = blk_offset; 1069 log->l_logBBsize = num_bblks; 1070 log->l_covered_state = XLOG_STATE_COVER_IDLE; 1071 log->l_flags |= XLOG_ACTIVE_RECOVERY; 1072 1073 log->l_prev_block = -1; 1074 ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0); 1075 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ 1076 log->l_last_sync_lsn = log->l_tail_lsn; 1077 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ 1078 log->l_grant_reserve_cycle = 1; 1079 log->l_grant_write_cycle = 1; 1080 1081 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) { 1082 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; 1083 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); 1084 /* for larger sector sizes, must have v2 or external log */ 1085 ASSERT(log->l_sectbb_log == 0 || 1086 log->l_logBBstart == 0 || 1087 XFS_SB_VERSION_HASLOGV2(&mp->m_sb)); 1088 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); 1089 } 1090 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; 1091 1092 xlog_get_iclog_buffer_size(mp, log); 1093 1094 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1095 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1096 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1097 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1098 ASSERT(XFS_BUF_ISBUSY(bp)); 1099 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 1100 log->l_xbuf = bp; 1101 1102 spinlock_init(&log->l_icloglock, "iclog"); 1103 spinlock_init(&log->l_grant_lock, "grhead_iclog"); 1104 initnsema(&log->l_flushsema, 0, "ic-flush"); 1105 xlog_state_ticket_alloc(log); /* wait until after icloglock inited */ 1106 1107 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ 1108 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); 1109 1110 iclogp = &log->l_iclog; 1111 /* 1112 * The amount of memory to allocate for the iclog structure is 1113 * rather funky due to the way the structure is defined. It is 1114 * done this way so that we can use different sizes for machines 1115 * with different amounts of memory. See the definition of 1116 * xlog_in_core_t in xfs_log_priv.h for details. 1117 */ 1118 iclogsize = log->l_iclog_size; 1119 ASSERT(log->l_iclog_size >= 4096); 1120 for (i=0; i < log->l_iclog_bufs; i++) { 1121 *iclogp = (xlog_in_core_t *) 1122 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP); 1123 iclog = *iclogp; 1124 iclog->hic_data = (xlog_in_core_2_t *) 1125 kmem_zalloc(iclogsize, KM_SLEEP); 1126 1127 iclog->ic_prev = prev_iclog; 1128 prev_iclog = iclog; 1129 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); 1130 1131 head = &iclog->ic_header; 1132 memset(head, 0, sizeof(xlog_rec_header_t)); 1133 INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); 1134 INT_SET(head->h_version, ARCH_CONVERT, 1135 XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); 1136 INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size); 1137 /* new fields */ 1138 INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT); 1139 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); 1140 1141 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1142 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1143 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1144 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1145 iclog->ic_bp = bp; 1146 1147 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; 1148 iclog->ic_state = XLOG_STATE_ACTIVE; 1149 iclog->ic_log = log; 1150 iclog->ic_callback_tail = &(iclog->ic_callback); 1151 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize; 1152 1153 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); 1154 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); 1155 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force"); 1156 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write"); 1157 1158 iclogp = &iclog->ic_next; 1159 } 1160 *iclogp = log->l_iclog; /* complete ring */ 1161 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ 1162 1163 return log; 1164 } /* xlog_alloc_log */ 1165 1166 1167 /* 1168 * Write out the commit record of a transaction associated with the given 1169 * ticket. Return the lsn of the commit record. 1170 */ 1171 STATIC int 1172 xlog_commit_record(xfs_mount_t *mp, 1173 xlog_ticket_t *ticket, 1174 xlog_in_core_t **iclog, 1175 xfs_lsn_t *commitlsnp) 1176 { 1177 int error; 1178 xfs_log_iovec_t reg[1]; 1179 1180 reg[0].i_addr = NULL; 1181 reg[0].i_len = 0; 1182 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); 1183 1184 ASSERT_ALWAYS(iclog); 1185 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, 1186 iclog, XLOG_COMMIT_TRANS))) { 1187 xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); 1188 } 1189 return (error); 1190 } /* xlog_commit_record */ 1191 1192 1193 /* 1194 * Push on the buffer cache code if we ever use more than 75% of the on-disk 1195 * log space. This code pushes on the lsn which would supposedly free up 1196 * the 25% which we want to leave free. We may need to adopt a policy which 1197 * pushes on an lsn which is further along in the log once we reach the high 1198 * water mark. In this manner, we would be creating a low water mark. 1199 */ 1200 void 1201 xlog_grant_push_ail(xfs_mount_t *mp, 1202 int need_bytes) 1203 { 1204 xlog_t *log = mp->m_log; /* pointer to the log */ 1205 xfs_lsn_t tail_lsn; /* lsn of the log tail */ 1206 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ 1207 int free_blocks; /* free blocks left to write to */ 1208 int free_bytes; /* free bytes left to write to */ 1209 int threshold_block; /* block in lsn we'd like to be at */ 1210 int threshold_cycle; /* lsn cycle we'd like to be at */ 1211 int free_threshold; 1212 SPLDECL(s); 1213 1214 ASSERT(BTOBB(need_bytes) < log->l_logBBsize); 1215 1216 s = GRANT_LOCK(log); 1217 free_bytes = xlog_space_left(log, 1218 log->l_grant_reserve_cycle, 1219 log->l_grant_reserve_bytes); 1220 tail_lsn = log->l_tail_lsn; 1221 free_blocks = BTOBBT(free_bytes); 1222 1223 /* 1224 * Set the threshold for the minimum number of free blocks in the 1225 * log to the maximum of what the caller needs, one quarter of the 1226 * log, and 256 blocks. 1227 */ 1228 free_threshold = BTOBB(need_bytes); 1229 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); 1230 free_threshold = MAX(free_threshold, 256); 1231 if (free_blocks < free_threshold) { 1232 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; 1233 threshold_cycle = CYCLE_LSN(tail_lsn); 1234 if (threshold_block >= log->l_logBBsize) { 1235 threshold_block -= log->l_logBBsize; 1236 threshold_cycle += 1; 1237 } 1238 ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle, 1239 threshold_block); 1240 1241 /* Don't pass in an lsn greater than the lsn of the last 1242 * log record known to be on disk. 1243 */ 1244 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) 1245 threshold_lsn = log->l_last_sync_lsn; 1246 } 1247 GRANT_UNLOCK(log, s); 1248 1249 /* 1250 * Get the transaction layer to kick the dirty buffers out to 1251 * disk asynchronously. No point in trying to do this if 1252 * the filesystem is shutting down. 1253 */ 1254 if (threshold_lsn && 1255 !XLOG_FORCED_SHUTDOWN(log)) 1256 xfs_trans_push_ail(mp, threshold_lsn); 1257 } /* xlog_grant_push_ail */ 1258 1259 1260 /* 1261 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous 1262 * fashion. Previously, we should have moved the current iclog 1263 * ptr in the log to point to the next available iclog. This allows further 1264 * write to continue while this code syncs out an iclog ready to go. 1265 * Before an in-core log can be written out, the data section must be scanned 1266 * to save away the 1st word of each BBSIZE block into the header. We replace 1267 * it with the current cycle count. Each BBSIZE block is tagged with the 1268 * cycle count because there in an implicit assumption that drives will 1269 * guarantee that entire 512 byte blocks get written at once. In other words, 1270 * we can't have part of a 512 byte block written and part not written. By 1271 * tagging each block, we will know which blocks are valid when recovering 1272 * after an unclean shutdown. 1273 * 1274 * This routine is single threaded on the iclog. No other thread can be in 1275 * this routine with the same iclog. Changing contents of iclog can there- 1276 * fore be done without grabbing the state machine lock. Updating the global 1277 * log will require grabbing the lock though. 1278 * 1279 * The entire log manager uses a logical block numbering scheme. Only 1280 * log_sync (and then only bwrite()) know about the fact that the log may 1281 * not start with block zero on a given device. The log block start offset 1282 * is added immediately before calling bwrite(). 1283 */ 1284 1285 int 1286 xlog_sync(xlog_t *log, 1287 xlog_in_core_t *iclog) 1288 { 1289 xfs_caddr_t dptr; /* pointer to byte sized element */ 1290 xfs_buf_t *bp; 1291 int i, ops; 1292 uint count; /* byte count of bwrite */ 1293 uint count_init; /* initial count before roundup */ 1294 int roundoff; /* roundoff to BB or stripe */ 1295 int split = 0; /* split write into two regions */ 1296 int error; 1297 SPLDECL(s); 1298 int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb); 1299 1300 XFS_STATS_INC(xs_log_writes); 1301 ASSERT(iclog->ic_refcnt == 0); 1302 1303 /* Add for LR header */ 1304 count_init = log->l_iclog_hsize + iclog->ic_offset; 1305 1306 /* Round out the log write size */ 1307 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { 1308 /* we have a v2 stripe unit to use */ 1309 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); 1310 } else { 1311 count = BBTOB(BTOBB(count_init)); 1312 } 1313 roundoff = count - count_init; 1314 ASSERT(roundoff >= 0); 1315 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && 1316 roundoff < log->l_mp->m_sb.sb_logsunit) 1317 || 1318 (log->l_mp->m_sb.sb_logsunit <= 1 && 1319 roundoff < BBTOB(1))); 1320 1321 /* move grant heads by roundoff in sync */ 1322 s = GRANT_LOCK(log); 1323 XLOG_GRANT_ADD_SPACE(log, roundoff, 'w'); 1324 XLOG_GRANT_ADD_SPACE(log, roundoff, 'r'); 1325 GRANT_UNLOCK(log, s); 1326 1327 /* put cycle number in every block */ 1328 xlog_pack_data(log, iclog, roundoff); 1329 1330 /* real byte length */ 1331 if (v2) { 1332 INT_SET(iclog->ic_header.h_len, 1333 ARCH_CONVERT, 1334 iclog->ic_offset + roundoff); 1335 } else { 1336 INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset); 1337 } 1338 1339 /* put ops count in correct order */ 1340 ops = iclog->ic_header.h_num_logops; 1341 INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops); 1342 1343 bp = iclog->ic_bp; 1344 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); 1345 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1346 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT))); 1347 1348 XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); 1349 1350 /* Do we need to split this write into 2 parts? */ 1351 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { 1352 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); 1353 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); 1354 iclog->ic_bwritecnt = 2; /* split into 2 writes */ 1355 } else { 1356 iclog->ic_bwritecnt = 1; 1357 } 1358 XFS_BUF_SET_PTR(bp, (xfs_caddr_t) &(iclog->ic_header), count); 1359 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ 1360 XFS_BUF_BUSY(bp); 1361 XFS_BUF_ASYNC(bp); 1362 /* 1363 * Do an ordered write for the log block. 1364 * 1365 * It may not be needed to flush the first split block in the log wrap 1366 * case, but do it anyways to be safe -AK 1367 */ 1368 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) 1369 XFS_BUF_ORDERED(bp); 1370 1371 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1372 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1373 1374 xlog_verify_iclog(log, iclog, count, B_TRUE); 1375 1376 /* account for log which doesn't start at block #0 */ 1377 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1378 /* 1379 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem 1380 * is shutting down. 1381 */ 1382 XFS_BUF_WRITE(bp); 1383 1384 if ((error = XFS_bwrite(bp))) { 1385 xfs_ioerror_alert("xlog_sync", log->l_mp, bp, 1386 XFS_BUF_ADDR(bp)); 1387 return (error); 1388 } 1389 if (split) { 1390 bp = iclog->ic_log->l_xbuf; 1391 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == 1392 (unsigned long)1); 1393 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1394 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ 1395 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ 1396 (__psint_t)count), split); 1397 XFS_BUF_SET_FSPRIVATE(bp, iclog); 1398 XFS_BUF_BUSY(bp); 1399 XFS_BUF_ASYNC(bp); 1400 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) 1401 XFS_BUF_ORDERED(bp); 1402 dptr = XFS_BUF_PTR(bp); 1403 /* 1404 * Bump the cycle numbers at the start of each block 1405 * since this part of the buffer is at the start of 1406 * a new cycle. Watch out for the header magic number 1407 * case, though. 1408 */ 1409 for (i=0; i<split; i += BBSIZE) { 1410 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1411 if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 1412 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1413 dptr += BBSIZE; 1414 } 1415 1416 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1417 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1418 1419 /* account for internal log which does't start at block #0 */ 1420 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1421 XFS_BUF_WRITE(bp); 1422 if ((error = XFS_bwrite(bp))) { 1423 xfs_ioerror_alert("xlog_sync (split)", log->l_mp, 1424 bp, XFS_BUF_ADDR(bp)); 1425 return (error); 1426 } 1427 } 1428 return (0); 1429 } /* xlog_sync */ 1430 1431 1432 /* 1433 * Unallocate a log structure 1434 */ 1435 void 1436 xlog_unalloc_log(xlog_t *log) 1437 { 1438 xlog_in_core_t *iclog, *next_iclog; 1439 xlog_ticket_t *tic, *next_tic; 1440 int i; 1441 1442 1443 iclog = log->l_iclog; 1444 for (i=0; i<log->l_iclog_bufs; i++) { 1445 sv_destroy(&iclog->ic_forcesema); 1446 sv_destroy(&iclog->ic_writesema); 1447 xfs_buf_free(iclog->ic_bp); 1448 #ifdef XFS_LOG_TRACE 1449 if (iclog->ic_trace != NULL) { 1450 ktrace_free(iclog->ic_trace); 1451 } 1452 #endif 1453 next_iclog = iclog->ic_next; 1454 kmem_free(iclog->hic_data, log->l_iclog_size); 1455 kmem_free(iclog, sizeof(xlog_in_core_t)); 1456 iclog = next_iclog; 1457 } 1458 freesema(&log->l_flushsema); 1459 spinlock_destroy(&log->l_icloglock); 1460 spinlock_destroy(&log->l_grant_lock); 1461 1462 /* XXXsup take a look at this again. */ 1463 if ((log->l_ticket_cnt != log->l_ticket_tcnt) && 1464 !XLOG_FORCED_SHUTDOWN(log)) { 1465 xfs_fs_cmn_err(CE_WARN, log->l_mp, 1466 "xlog_unalloc_log: (cnt: %d, total: %d)", 1467 log->l_ticket_cnt, log->l_ticket_tcnt); 1468 /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */ 1469 1470 } else { 1471 tic = log->l_unmount_free; 1472 while (tic) { 1473 next_tic = tic->t_next; 1474 kmem_free(tic, NBPP); 1475 tic = next_tic; 1476 } 1477 } 1478 xfs_buf_free(log->l_xbuf); 1479 #ifdef XFS_LOG_TRACE 1480 if (log->l_trace != NULL) { 1481 ktrace_free(log->l_trace); 1482 } 1483 if (log->l_grant_trace != NULL) { 1484 ktrace_free(log->l_grant_trace); 1485 } 1486 #endif 1487 log->l_mp->m_log = NULL; 1488 kmem_free(log, sizeof(xlog_t)); 1489 } /* xlog_unalloc_log */ 1490 1491 /* 1492 * Update counters atomically now that memcpy is done. 1493 */ 1494 /* ARGSUSED */ 1495 static inline void 1496 xlog_state_finish_copy(xlog_t *log, 1497 xlog_in_core_t *iclog, 1498 int record_cnt, 1499 int copy_bytes) 1500 { 1501 SPLDECL(s); 1502 1503 s = LOG_LOCK(log); 1504 1505 iclog->ic_header.h_num_logops += record_cnt; 1506 iclog->ic_offset += copy_bytes; 1507 1508 LOG_UNLOCK(log, s); 1509 } /* xlog_state_finish_copy */ 1510 1511 1512 1513 1514 /* 1515 * print out info relating to regions written which consume 1516 * the reservation 1517 */ 1518 #if defined(XFS_LOG_RES_DEBUG) 1519 STATIC void 1520 xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) 1521 { 1522 uint i; 1523 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); 1524 1525 /* match with XLOG_REG_TYPE_* in xfs_log.h */ 1526 static char *res_type_str[XLOG_REG_TYPE_MAX] = { 1527 "bformat", 1528 "bchunk", 1529 "efi_format", 1530 "efd_format", 1531 "iformat", 1532 "icore", 1533 "iext", 1534 "ibroot", 1535 "ilocal", 1536 "iattr_ext", 1537 "iattr_broot", 1538 "iattr_local", 1539 "qformat", 1540 "dquot", 1541 "quotaoff", 1542 "LR header", 1543 "unmount", 1544 "commit", 1545 "trans header" 1546 }; 1547 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { 1548 "SETATTR_NOT_SIZE", 1549 "SETATTR_SIZE", 1550 "INACTIVE", 1551 "CREATE", 1552 "CREATE_TRUNC", 1553 "TRUNCATE_FILE", 1554 "REMOVE", 1555 "LINK", 1556 "RENAME", 1557 "MKDIR", 1558 "RMDIR", 1559 "SYMLINK", 1560 "SET_DMATTRS", 1561 "GROWFS", 1562 "STRAT_WRITE", 1563 "DIOSTRAT", 1564 "WRITE_SYNC", 1565 "WRITEID", 1566 "ADDAFORK", 1567 "ATTRINVAL", 1568 "ATRUNCATE", 1569 "ATTR_SET", 1570 "ATTR_RM", 1571 "ATTR_FLAG", 1572 "CLEAR_AGI_BUCKET", 1573 "QM_SBCHANGE", 1574 "DUMMY1", 1575 "DUMMY2", 1576 "QM_QUOTAOFF", 1577 "QM_DQALLOC", 1578 "QM_SETQLIM", 1579 "QM_DQCLUSTER", 1580 "QM_QINOCREATE", 1581 "QM_QUOTAOFF_END", 1582 "SB_UNIT", 1583 "FSYNC_TS", 1584 "GROWFSRT_ALLOC", 1585 "GROWFSRT_ZERO", 1586 "GROWFSRT_FREE", 1587 "SWAPEXT" 1588 }; 1589 1590 xfs_fs_cmn_err(CE_WARN, mp, 1591 "xfs_log_write: reservation summary:\n" 1592 " trans type = %s (%u)\n" 1593 " unit res = %d bytes\n" 1594 " current res = %d bytes\n" 1595 " total reg = %u bytes (o/flow = %u bytes)\n" 1596 " ophdrs = %u (ophdr space = %u bytes)\n" 1597 " ophdr + reg = %u bytes\n" 1598 " num regions = %u\n", 1599 ((ticket->t_trans_type <= 0 || 1600 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? 1601 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), 1602 ticket->t_trans_type, 1603 ticket->t_unit_res, 1604 ticket->t_curr_res, 1605 ticket->t_res_arr_sum, ticket->t_res_o_flow, 1606 ticket->t_res_num_ophdrs, ophdr_spc, 1607 ticket->t_res_arr_sum + 1608 ticket->t_res_o_flow + ophdr_spc, 1609 ticket->t_res_num); 1610 1611 for (i = 0; i < ticket->t_res_num; i++) { 1612 uint r_type = ticket->t_res_arr[i].r_type; 1613 cmn_err(CE_WARN, 1614 "region[%u]: %s - %u bytes\n", 1615 i, 1616 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? 1617 "bad-rtype" : res_type_str[r_type-1]), 1618 ticket->t_res_arr[i].r_len); 1619 } 1620 } 1621 #else 1622 #define xlog_print_tic_res(mp, ticket) 1623 #endif 1624 1625 /* 1626 * Write some region out to in-core log 1627 * 1628 * This will be called when writing externally provided regions or when 1629 * writing out a commit record for a given transaction. 1630 * 1631 * General algorithm: 1632 * 1. Find total length of this write. This may include adding to the 1633 * lengths passed in. 1634 * 2. Check whether we violate the tickets reservation. 1635 * 3. While writing to this iclog 1636 * A. Reserve as much space in this iclog as can get 1637 * B. If this is first write, save away start lsn 1638 * C. While writing this region: 1639 * 1. If first write of transaction, write start record 1640 * 2. Write log operation header (header per region) 1641 * 3. Find out if we can fit entire region into this iclog 1642 * 4. Potentially, verify destination memcpy ptr 1643 * 5. Memcpy (partial) region 1644 * 6. If partial copy, release iclog; otherwise, continue 1645 * copying more regions into current iclog 1646 * 4. Mark want sync bit (in simulation mode) 1647 * 5. Release iclog for potential flush to on-disk log. 1648 * 1649 * ERRORS: 1650 * 1. Panic if reservation is overrun. This should never happen since 1651 * reservation amounts are generated internal to the filesystem. 1652 * NOTES: 1653 * 1. Tickets are single threaded data structures. 1654 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the 1655 * syncing routine. When a single log_write region needs to span 1656 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set 1657 * on all log operation writes which don't contain the end of the 1658 * region. The XLOG_END_TRANS bit is used for the in-core log 1659 * operation which contains the end of the continued log_write region. 1660 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, 1661 * we don't really know exactly how much space will be used. As a result, 1662 * we don't update ic_offset until the end when we know exactly how many 1663 * bytes have been written out. 1664 */ 1665 int 1666 xlog_write(xfs_mount_t * mp, 1667 xfs_log_iovec_t reg[], 1668 int nentries, 1669 xfs_log_ticket_t tic, 1670 xfs_lsn_t *start_lsn, 1671 xlog_in_core_t **commit_iclog, 1672 uint flags) 1673 { 1674 xlog_t *log = mp->m_log; 1675 xlog_ticket_t *ticket = (xlog_ticket_t *)tic; 1676 xlog_op_header_t *logop_head; /* ptr to log operation header */ 1677 xlog_in_core_t *iclog; /* ptr to current in-core log */ 1678 __psint_t ptr; /* copy address into data region */ 1679 int len; /* # xlog_write() bytes 2 still copy */ 1680 int index; /* region index currently copying */ 1681 int log_offset; /* offset (from 0) into data region */ 1682 int start_rec_copy; /* # bytes to copy for start record */ 1683 int partial_copy; /* did we split a region? */ 1684 int partial_copy_len;/* # bytes copied if split region */ 1685 int need_copy; /* # bytes need to memcpy this region */ 1686 int copy_len; /* # bytes actually memcpy'ing */ 1687 int copy_off; /* # bytes from entry start */ 1688 int contwr; /* continued write of in-core log? */ 1689 int error; 1690 int record_cnt = 0, data_cnt = 0; 1691 1692 partial_copy_len = partial_copy = 0; 1693 1694 /* Calculate potential maximum space. Each region gets its own 1695 * xlog_op_header_t and may need to be double word aligned. 1696 */ 1697 len = 0; 1698 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ 1699 len += sizeof(xlog_op_header_t); 1700 XLOG_TIC_ADD_OPHDR(ticket); 1701 } 1702 1703 for (index = 0; index < nentries; index++) { 1704 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ 1705 XLOG_TIC_ADD_OPHDR(ticket); 1706 len += reg[index].i_len; 1707 XLOG_TIC_ADD_REGION(ticket, reg[index].i_len, reg[index].i_type); 1708 } 1709 contwr = *start_lsn = 0; 1710 1711 if (ticket->t_curr_res < len) { 1712 xlog_print_tic_res(mp, ticket); 1713 #ifdef DEBUG 1714 xlog_panic( 1715 "xfs_log_write: reservation ran out. Need to up reservation"); 1716 #else 1717 /* Customer configurable panic */ 1718 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, 1719 "xfs_log_write: reservation ran out. Need to up reservation"); 1720 /* If we did not panic, shutdown the filesystem */ 1721 xfs_force_shutdown(mp, XFS_CORRUPT_INCORE); 1722 #endif 1723 } else 1724 ticket->t_curr_res -= len; 1725 1726 for (index = 0; index < nentries; ) { 1727 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, 1728 &contwr, &log_offset))) 1729 return (error); 1730 1731 ASSERT(log_offset <= iclog->ic_size - 1); 1732 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); 1733 1734 /* start_lsn is the first lsn written to. That's all we need. */ 1735 if (! *start_lsn) 1736 *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 1737 1738 /* This loop writes out as many regions as can fit in the amount 1739 * of space which was allocated by xlog_state_get_iclog_space(). 1740 */ 1741 while (index < nentries) { 1742 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); 1743 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); 1744 start_rec_copy = 0; 1745 1746 /* If first write for transaction, insert start record. 1747 * We can't be trying to commit if we are inited. We can't 1748 * have any "partial_copy" if we are inited. 1749 */ 1750 if (ticket->t_flags & XLOG_TIC_INITED) { 1751 logop_head = (xlog_op_header_t *)ptr; 1752 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1753 logop_head->oh_clientid = ticket->t_clientid; 1754 logop_head->oh_len = 0; 1755 logop_head->oh_flags = XLOG_START_TRANS; 1756 logop_head->oh_res2 = 0; 1757 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ 1758 record_cnt++; 1759 1760 start_rec_copy = sizeof(xlog_op_header_t); 1761 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); 1762 } 1763 1764 /* Copy log operation header directly into data section */ 1765 logop_head = (xlog_op_header_t *)ptr; 1766 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1767 logop_head->oh_clientid = ticket->t_clientid; 1768 logop_head->oh_res2 = 0; 1769 1770 /* header copied directly */ 1771 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); 1772 1773 /* are we copying a commit or unmount record? */ 1774 logop_head->oh_flags = flags; 1775 1776 /* 1777 * We've seen logs corrupted with bad transaction client 1778 * ids. This makes sure that XFS doesn't generate them on. 1779 * Turn this into an EIO and shut down the filesystem. 1780 */ 1781 switch (logop_head->oh_clientid) { 1782 case XFS_TRANSACTION: 1783 case XFS_VOLUME: 1784 case XFS_LOG: 1785 break; 1786 default: 1787 xfs_fs_cmn_err(CE_WARN, mp, 1788 "Bad XFS transaction clientid 0x%x in ticket 0x%p", 1789 logop_head->oh_clientid, tic); 1790 return XFS_ERROR(EIO); 1791 } 1792 1793 /* Partial write last time? => (partial_copy != 0) 1794 * need_copy is the amount we'd like to copy if everything could 1795 * fit in the current memcpy. 1796 */ 1797 need_copy = reg[index].i_len - partial_copy_len; 1798 1799 copy_off = partial_copy_len; 1800 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ 1801 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy); 1802 if (partial_copy) 1803 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); 1804 partial_copy_len = partial_copy = 0; 1805 } else { /* partial write */ 1806 copy_len = iclog->ic_size - log_offset; 1807 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len); 1808 logop_head->oh_flags |= XLOG_CONTINUE_TRANS; 1809 if (partial_copy) 1810 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; 1811 partial_copy_len += copy_len; 1812 partial_copy++; 1813 len += sizeof(xlog_op_header_t); /* from splitting of region */ 1814 /* account for new log op header */ 1815 ticket->t_curr_res -= sizeof(xlog_op_header_t); 1816 XLOG_TIC_ADD_OPHDR(ticket); 1817 } 1818 xlog_verify_dest_ptr(log, ptr); 1819 1820 /* copy region */ 1821 ASSERT(copy_len >= 0); 1822 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); 1823 xlog_write_adv_cnt(ptr, len, log_offset, copy_len); 1824 1825 /* make copy_len total bytes copied, including headers */ 1826 copy_len += start_rec_copy + sizeof(xlog_op_header_t); 1827 record_cnt++; 1828 data_cnt += contwr ? copy_len : 0; 1829 if (partial_copy) { /* copied partial region */ 1830 /* already marked WANT_SYNC by xlog_state_get_iclog_space */ 1831 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1832 record_cnt = data_cnt = 0; 1833 if ((error = xlog_state_release_iclog(log, iclog))) 1834 return (error); 1835 break; /* don't increment index */ 1836 } else { /* copied entire region */ 1837 index++; 1838 partial_copy_len = partial_copy = 0; 1839 1840 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { 1841 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1842 record_cnt = data_cnt = 0; 1843 xlog_state_want_sync(log, iclog); 1844 if (commit_iclog) { 1845 ASSERT(flags & XLOG_COMMIT_TRANS); 1846 *commit_iclog = iclog; 1847 } else if ((error = xlog_state_release_iclog(log, iclog))) 1848 return (error); 1849 if (index == nentries) 1850 return 0; /* we are done */ 1851 else 1852 break; 1853 } 1854 } /* if (partial_copy) */ 1855 } /* while (index < nentries) */ 1856 } /* for (index = 0; index < nentries; ) */ 1857 ASSERT(len == 0); 1858 1859 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1860 if (commit_iclog) { 1861 ASSERT(flags & XLOG_COMMIT_TRANS); 1862 *commit_iclog = iclog; 1863 return 0; 1864 } 1865 return (xlog_state_release_iclog(log, iclog)); 1866 } /* xlog_write */ 1867 1868 1869 /***************************************************************************** 1870 * 1871 * State Machine functions 1872 * 1873 ***************************************************************************** 1874 */ 1875 1876 /* Clean iclogs starting from the head. This ordering must be 1877 * maintained, so an iclog doesn't become ACTIVE beyond one that 1878 * is SYNCING. This is also required to maintain the notion that we use 1879 * a counting semaphore to hold off would be writers to the log when every 1880 * iclog is trying to sync to disk. 1881 * 1882 * State Change: DIRTY -> ACTIVE 1883 */ 1884 STATIC void 1885 xlog_state_clean_log(xlog_t *log) 1886 { 1887 xlog_in_core_t *iclog; 1888 int changed = 0; 1889 1890 iclog = log->l_iclog; 1891 do { 1892 if (iclog->ic_state == XLOG_STATE_DIRTY) { 1893 iclog->ic_state = XLOG_STATE_ACTIVE; 1894 iclog->ic_offset = 0; 1895 iclog->ic_callback = NULL; /* don't need to free */ 1896 /* 1897 * If the number of ops in this iclog indicate it just 1898 * contains the dummy transaction, we can 1899 * change state into IDLE (the second time around). 1900 * Otherwise we should change the state into 1901 * NEED a dummy. 1902 * We don't need to cover the dummy. 1903 */ 1904 if (!changed && 1905 (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) { 1906 changed = 1; 1907 } else { 1908 /* 1909 * We have two dirty iclogs so start over 1910 * This could also be num of ops indicates 1911 * this is not the dummy going out. 1912 */ 1913 changed = 2; 1914 } 1915 iclog->ic_header.h_num_logops = 0; 1916 memset(iclog->ic_header.h_cycle_data, 0, 1917 sizeof(iclog->ic_header.h_cycle_data)); 1918 iclog->ic_header.h_lsn = 0; 1919 } else if (iclog->ic_state == XLOG_STATE_ACTIVE) 1920 /* do nothing */; 1921 else 1922 break; /* stop cleaning */ 1923 iclog = iclog->ic_next; 1924 } while (iclog != log->l_iclog); 1925 1926 /* log is locked when we are called */ 1927 /* 1928 * Change state for the dummy log recording. 1929 * We usually go to NEED. But we go to NEED2 if the changed indicates 1930 * we are done writing the dummy record. 1931 * If we are done with the second dummy recored (DONE2), then 1932 * we go to IDLE. 1933 */ 1934 if (changed) { 1935 switch (log->l_covered_state) { 1936 case XLOG_STATE_COVER_IDLE: 1937 case XLOG_STATE_COVER_NEED: 1938 case XLOG_STATE_COVER_NEED2: 1939 log->l_covered_state = XLOG_STATE_COVER_NEED; 1940 break; 1941 1942 case XLOG_STATE_COVER_DONE: 1943 if (changed == 1) 1944 log->l_covered_state = XLOG_STATE_COVER_NEED2; 1945 else 1946 log->l_covered_state = XLOG_STATE_COVER_NEED; 1947 break; 1948 1949 case XLOG_STATE_COVER_DONE2: 1950 if (changed == 1) 1951 log->l_covered_state = XLOG_STATE_COVER_IDLE; 1952 else 1953 log->l_covered_state = XLOG_STATE_COVER_NEED; 1954 break; 1955 1956 default: 1957 ASSERT(0); 1958 } 1959 } 1960 } /* xlog_state_clean_log */ 1961 1962 STATIC xfs_lsn_t 1963 xlog_get_lowest_lsn( 1964 xlog_t *log) 1965 { 1966 xlog_in_core_t *lsn_log; 1967 xfs_lsn_t lowest_lsn, lsn; 1968 1969 lsn_log = log->l_iclog; 1970 lowest_lsn = 0; 1971 do { 1972 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { 1973 lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT); 1974 if ((lsn && !lowest_lsn) || 1975 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { 1976 lowest_lsn = lsn; 1977 } 1978 } 1979 lsn_log = lsn_log->ic_next; 1980 } while (lsn_log != log->l_iclog); 1981 return(lowest_lsn); 1982 } 1983 1984 1985 STATIC void 1986 xlog_state_do_callback( 1987 xlog_t *log, 1988 int aborted, 1989 xlog_in_core_t *ciclog) 1990 { 1991 xlog_in_core_t *iclog; 1992 xlog_in_core_t *first_iclog; /* used to know when we've 1993 * processed all iclogs once */ 1994 xfs_log_callback_t *cb, *cb_next; 1995 int flushcnt = 0; 1996 xfs_lsn_t lowest_lsn; 1997 int ioerrors; /* counter: iclogs with errors */ 1998 int loopdidcallbacks; /* flag: inner loop did callbacks*/ 1999 int funcdidcallbacks; /* flag: function did callbacks */ 2000 int repeats; /* for issuing console warnings if 2001 * looping too many times */ 2002 SPLDECL(s); 2003 2004 s = LOG_LOCK(log); 2005 first_iclog = iclog = log->l_iclog; 2006 ioerrors = 0; 2007 funcdidcallbacks = 0; 2008 repeats = 0; 2009 2010 do { 2011 /* 2012 * Scan all iclogs starting with the one pointed to by the 2013 * log. Reset this starting point each time the log is 2014 * unlocked (during callbacks). 2015 * 2016 * Keep looping through iclogs until one full pass is made 2017 * without running any callbacks. 2018 */ 2019 first_iclog = log->l_iclog; 2020 iclog = log->l_iclog; 2021 loopdidcallbacks = 0; 2022 repeats++; 2023 2024 do { 2025 2026 /* skip all iclogs in the ACTIVE & DIRTY states */ 2027 if (iclog->ic_state & 2028 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { 2029 iclog = iclog->ic_next; 2030 continue; 2031 } 2032 2033 /* 2034 * Between marking a filesystem SHUTDOWN and stopping 2035 * the log, we do flush all iclogs to disk (if there 2036 * wasn't a log I/O error). So, we do want things to 2037 * go smoothly in case of just a SHUTDOWN w/o a 2038 * LOG_IO_ERROR. 2039 */ 2040 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 2041 /* 2042 * Can only perform callbacks in order. Since 2043 * this iclog is not in the DONE_SYNC/ 2044 * DO_CALLBACK state, we skip the rest and 2045 * just try to clean up. If we set our iclog 2046 * to DO_CALLBACK, we will not process it when 2047 * we retry since a previous iclog is in the 2048 * CALLBACK and the state cannot change since 2049 * we are holding the LOG_LOCK. 2050 */ 2051 if (!(iclog->ic_state & 2052 (XLOG_STATE_DONE_SYNC | 2053 XLOG_STATE_DO_CALLBACK))) { 2054 if (ciclog && (ciclog->ic_state == 2055 XLOG_STATE_DONE_SYNC)) { 2056 ciclog->ic_state = XLOG_STATE_DO_CALLBACK; 2057 } 2058 break; 2059 } 2060 /* 2061 * We now have an iclog that is in either the 2062 * DO_CALLBACK or DONE_SYNC states. The other 2063 * states (WANT_SYNC, SYNCING, or CALLBACK were 2064 * caught by the above if and are going to 2065 * clean (i.e. we aren't doing their callbacks) 2066 * see the above if. 2067 */ 2068 2069 /* 2070 * We will do one more check here to see if we 2071 * have chased our tail around. 2072 */ 2073 2074 lowest_lsn = xlog_get_lowest_lsn(log); 2075 if (lowest_lsn && ( 2076 XFS_LSN_CMP( 2077 lowest_lsn, 2078 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2079 )<0)) { 2080 iclog = iclog->ic_next; 2081 continue; /* Leave this iclog for 2082 * another thread */ 2083 } 2084 2085 iclog->ic_state = XLOG_STATE_CALLBACK; 2086 2087 LOG_UNLOCK(log, s); 2088 2089 /* l_last_sync_lsn field protected by 2090 * GRANT_LOCK. Don't worry about iclog's lsn. 2091 * No one else can be here except us. 2092 */ 2093 s = GRANT_LOCK(log); 2094 ASSERT(XFS_LSN_CMP( 2095 log->l_last_sync_lsn, 2096 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2097 )<=0); 2098 log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2099 GRANT_UNLOCK(log, s); 2100 2101 /* 2102 * Keep processing entries in the callback list 2103 * until we come around and it is empty. We 2104 * need to atomically see that the list is 2105 * empty and change the state to DIRTY so that 2106 * we don't miss any more callbacks being added. 2107 */ 2108 s = LOG_LOCK(log); 2109 } else { 2110 ioerrors++; 2111 } 2112 cb = iclog->ic_callback; 2113 2114 while (cb != 0) { 2115 iclog->ic_callback_tail = &(iclog->ic_callback); 2116 iclog->ic_callback = NULL; 2117 LOG_UNLOCK(log, s); 2118 2119 /* perform callbacks in the order given */ 2120 for (; cb != 0; cb = cb_next) { 2121 cb_next = cb->cb_next; 2122 cb->cb_func(cb->cb_arg, aborted); 2123 } 2124 s = LOG_LOCK(log); 2125 cb = iclog->ic_callback; 2126 } 2127 2128 loopdidcallbacks++; 2129 funcdidcallbacks++; 2130 2131 ASSERT(iclog->ic_callback == 0); 2132 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) 2133 iclog->ic_state = XLOG_STATE_DIRTY; 2134 2135 /* 2136 * Transition from DIRTY to ACTIVE if applicable. 2137 * NOP if STATE_IOERROR. 2138 */ 2139 xlog_state_clean_log(log); 2140 2141 /* wake up threads waiting in xfs_log_force() */ 2142 sv_broadcast(&iclog->ic_forcesema); 2143 2144 iclog = iclog->ic_next; 2145 } while (first_iclog != iclog); 2146 if (repeats && (repeats % 10) == 0) { 2147 xfs_fs_cmn_err(CE_WARN, log->l_mp, 2148 "xlog_state_do_callback: looping %d", repeats); 2149 } 2150 } while (!ioerrors && loopdidcallbacks); 2151 2152 /* 2153 * make one last gasp attempt to see if iclogs are being left in 2154 * limbo.. 2155 */ 2156 #ifdef DEBUG 2157 if (funcdidcallbacks) { 2158 first_iclog = iclog = log->l_iclog; 2159 do { 2160 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); 2161 /* 2162 * Terminate the loop if iclogs are found in states 2163 * which will cause other threads to clean up iclogs. 2164 * 2165 * SYNCING - i/o completion will go through logs 2166 * DONE_SYNC - interrupt thread should be waiting for 2167 * LOG_LOCK 2168 * IOERROR - give up hope all ye who enter here 2169 */ 2170 if (iclog->ic_state == XLOG_STATE_WANT_SYNC || 2171 iclog->ic_state == XLOG_STATE_SYNCING || 2172 iclog->ic_state == XLOG_STATE_DONE_SYNC || 2173 iclog->ic_state == XLOG_STATE_IOERROR ) 2174 break; 2175 iclog = iclog->ic_next; 2176 } while (first_iclog != iclog); 2177 } 2178 #endif 2179 2180 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { 2181 flushcnt = log->l_flushcnt; 2182 log->l_flushcnt = 0; 2183 } 2184 LOG_UNLOCK(log, s); 2185 while (flushcnt--) 2186 vsema(&log->l_flushsema); 2187 } /* xlog_state_do_callback */ 2188 2189 2190 /* 2191 * Finish transitioning this iclog to the dirty state. 2192 * 2193 * Make sure that we completely execute this routine only when this is 2194 * the last call to the iclog. There is a good chance that iclog flushes, 2195 * when we reach the end of the physical log, get turned into 2 separate 2196 * calls to bwrite. Hence, one iclog flush could generate two calls to this 2197 * routine. By using the reference count bwritecnt, we guarantee that only 2198 * the second completion goes through. 2199 * 2200 * Callbacks could take time, so they are done outside the scope of the 2201 * global state machine log lock. Assume that the calls to cvsema won't 2202 * take a long time. At least we know it won't sleep. 2203 */ 2204 void 2205 xlog_state_done_syncing( 2206 xlog_in_core_t *iclog, 2207 int aborted) 2208 { 2209 xlog_t *log = iclog->ic_log; 2210 SPLDECL(s); 2211 2212 s = LOG_LOCK(log); 2213 2214 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || 2215 iclog->ic_state == XLOG_STATE_IOERROR); 2216 ASSERT(iclog->ic_refcnt == 0); 2217 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); 2218 2219 2220 /* 2221 * If we got an error, either on the first buffer, or in the case of 2222 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, 2223 * and none should ever be attempted to be written to disk 2224 * again. 2225 */ 2226 if (iclog->ic_state != XLOG_STATE_IOERROR) { 2227 if (--iclog->ic_bwritecnt == 1) { 2228 LOG_UNLOCK(log, s); 2229 return; 2230 } 2231 iclog->ic_state = XLOG_STATE_DONE_SYNC; 2232 } 2233 2234 /* 2235 * Someone could be sleeping prior to writing out the next 2236 * iclog buffer, we wake them all, one will get to do the 2237 * I/O, the others get to wait for the result. 2238 */ 2239 sv_broadcast(&iclog->ic_writesema); 2240 LOG_UNLOCK(log, s); 2241 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ 2242 } /* xlog_state_done_syncing */ 2243 2244 2245 /* 2246 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must 2247 * sleep. The flush semaphore is set to the number of in-core buffers and 2248 * decremented around disk syncing. Therefore, if all buffers are syncing, 2249 * this semaphore will cause new writes to sleep until a sync completes. 2250 * Otherwise, this code just does p() followed by v(). This approximates 2251 * a sleep/wakeup except we can't race. 2252 * 2253 * The in-core logs are used in a circular fashion. They are not used 2254 * out-of-order even when an iclog past the head is free. 2255 * 2256 * return: 2257 * * log_offset where xlog_write() can start writing into the in-core 2258 * log's data space. 2259 * * in-core log pointer to which xlog_write() should write. 2260 * * boolean indicating this is a continued write to an in-core log. 2261 * If this is the last write, then the in-core log's offset field 2262 * needs to be incremented, depending on the amount of data which 2263 * is copied. 2264 */ 2265 int 2266 xlog_state_get_iclog_space(xlog_t *log, 2267 int len, 2268 xlog_in_core_t **iclogp, 2269 xlog_ticket_t *ticket, 2270 int *continued_write, 2271 int *logoffsetp) 2272 { 2273 SPLDECL(s); 2274 int log_offset; 2275 xlog_rec_header_t *head; 2276 xlog_in_core_t *iclog; 2277 int error; 2278 2279 restart: 2280 s = LOG_LOCK(log); 2281 if (XLOG_FORCED_SHUTDOWN(log)) { 2282 LOG_UNLOCK(log, s); 2283 return XFS_ERROR(EIO); 2284 } 2285 2286 iclog = log->l_iclog; 2287 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { 2288 log->l_flushcnt++; 2289 LOG_UNLOCK(log, s); 2290 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); 2291 XFS_STATS_INC(xs_log_noiclogs); 2292 /* Ensure that log writes happen */ 2293 psema(&log->l_flushsema, PINOD); 2294 goto restart; 2295 } 2296 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2297 head = &iclog->ic_header; 2298 2299 iclog->ic_refcnt++; /* prevents sync */ 2300 log_offset = iclog->ic_offset; 2301 2302 /* On the 1st write to an iclog, figure out lsn. This works 2303 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are 2304 * committing to. If the offset is set, that's how many blocks 2305 * must be written. 2306 */ 2307 if (log_offset == 0) { 2308 ticket->t_curr_res -= log->l_iclog_hsize; 2309 XLOG_TIC_ADD_REGION(ticket, 2310 log->l_iclog_hsize, 2311 XLOG_REG_TYPE_LRHEADER); 2312 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle); 2313 ASSIGN_LSN(head->h_lsn, log); 2314 ASSERT(log->l_curr_block >= 0); 2315 } 2316 2317 /* If there is enough room to write everything, then do it. Otherwise, 2318 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC 2319 * bit is on, so this will get flushed out. Don't update ic_offset 2320 * until you know exactly how many bytes get copied. Therefore, wait 2321 * until later to update ic_offset. 2322 * 2323 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's 2324 * can fit into remaining data section. 2325 */ 2326 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { 2327 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2328 2329 /* If I'm the only one writing to this iclog, sync it to disk */ 2330 if (iclog->ic_refcnt == 1) { 2331 LOG_UNLOCK(log, s); 2332 if ((error = xlog_state_release_iclog(log, iclog))) 2333 return (error); 2334 } else { 2335 iclog->ic_refcnt--; 2336 LOG_UNLOCK(log, s); 2337 } 2338 goto restart; 2339 } 2340 2341 /* Do we have enough room to write the full amount in the remainder 2342 * of this iclog? Or must we continue a write on the next iclog and 2343 * mark this iclog as completely taken? In the case where we switch 2344 * iclogs (to mark it taken), this particular iclog will release/sync 2345 * to disk in xlog_write(). 2346 */ 2347 if (len <= iclog->ic_size - iclog->ic_offset) { 2348 *continued_write = 0; 2349 iclog->ic_offset += len; 2350 } else { 2351 *continued_write = 1; 2352 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2353 } 2354 *iclogp = iclog; 2355 2356 ASSERT(iclog->ic_offset <= iclog->ic_size); 2357 LOG_UNLOCK(log, s); 2358 2359 *logoffsetp = log_offset; 2360 return 0; 2361 } /* xlog_state_get_iclog_space */ 2362 2363 /* 2364 * Atomically get the log space required for a log ticket. 2365 * 2366 * Once a ticket gets put onto the reserveq, it will only return after 2367 * the needed reservation is satisfied. 2368 */ 2369 STATIC int 2370 xlog_grant_log_space(xlog_t *log, 2371 xlog_ticket_t *tic) 2372 { 2373 int free_bytes; 2374 int need_bytes; 2375 SPLDECL(s); 2376 #ifdef DEBUG 2377 xfs_lsn_t tail_lsn; 2378 #endif 2379 2380 2381 #ifdef DEBUG 2382 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2383 panic("grant Recovery problem"); 2384 #endif 2385 2386 /* Is there space or do we need to sleep? */ 2387 s = GRANT_LOCK(log); 2388 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); 2389 2390 /* something is already sleeping; insert new transaction at end */ 2391 if (log->l_reserve_headq) { 2392 XLOG_INS_TICKETQ(log->l_reserve_headq, tic); 2393 xlog_trace_loggrant(log, tic, 2394 "xlog_grant_log_space: sleep 1"); 2395 /* 2396 * Gotta check this before going to sleep, while we're 2397 * holding the grant lock. 2398 */ 2399 if (XLOG_FORCED_SHUTDOWN(log)) 2400 goto error_return; 2401 2402 XFS_STATS_INC(xs_sleep_logspace); 2403 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2404 /* 2405 * If we got an error, and the filesystem is shutting down, 2406 * we'll catch it down below. So just continue... 2407 */ 2408 xlog_trace_loggrant(log, tic, 2409 "xlog_grant_log_space: wake 1"); 2410 s = GRANT_LOCK(log); 2411 } 2412 if (tic->t_flags & XFS_LOG_PERM_RESERV) 2413 need_bytes = tic->t_unit_res*tic->t_ocnt; 2414 else 2415 need_bytes = tic->t_unit_res; 2416 2417 redo: 2418 if (XLOG_FORCED_SHUTDOWN(log)) 2419 goto error_return; 2420 2421 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, 2422 log->l_grant_reserve_bytes); 2423 if (free_bytes < need_bytes) { 2424 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2425 XLOG_INS_TICKETQ(log->l_reserve_headq, tic); 2426 xlog_trace_loggrant(log, tic, 2427 "xlog_grant_log_space: sleep 2"); 2428 XFS_STATS_INC(xs_sleep_logspace); 2429 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2430 2431 if (XLOG_FORCED_SHUTDOWN(log)) { 2432 s = GRANT_LOCK(log); 2433 goto error_return; 2434 } 2435 2436 xlog_trace_loggrant(log, tic, 2437 "xlog_grant_log_space: wake 2"); 2438 xlog_grant_push_ail(log->l_mp, need_bytes); 2439 s = GRANT_LOCK(log); 2440 goto redo; 2441 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2442 XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); 2443 2444 /* we've got enough space */ 2445 XLOG_GRANT_ADD_SPACE(log, need_bytes, 'w'); 2446 XLOG_GRANT_ADD_SPACE(log, need_bytes, 'r'); 2447 #ifdef DEBUG 2448 tail_lsn = log->l_tail_lsn; 2449 /* 2450 * Check to make sure the grant write head didn't just over lap the 2451 * tail. If the cycles are the same, we can't be overlapping. 2452 * Otherwise, make sure that the cycles differ by exactly one and 2453 * check the byte count. 2454 */ 2455 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2456 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2457 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2458 } 2459 #endif 2460 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); 2461 xlog_verify_grant_head(log, 1); 2462 GRANT_UNLOCK(log, s); 2463 return 0; 2464 2465 error_return: 2466 if (tic->t_flags & XLOG_TIC_IN_Q) 2467 XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); 2468 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); 2469 /* 2470 * If we are failing, make sure the ticket doesn't have any 2471 * current reservations. We don't want to add this back when 2472 * the ticket/transaction gets cancelled. 2473 */ 2474 tic->t_curr_res = 0; 2475 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2476 GRANT_UNLOCK(log, s); 2477 return XFS_ERROR(EIO); 2478 } /* xlog_grant_log_space */ 2479 2480 2481 /* 2482 * Replenish the byte reservation required by moving the grant write head. 2483 * 2484 * 2485 */ 2486 STATIC int 2487 xlog_regrant_write_log_space(xlog_t *log, 2488 xlog_ticket_t *tic) 2489 { 2490 SPLDECL(s); 2491 int free_bytes, need_bytes; 2492 xlog_ticket_t *ntic; 2493 #ifdef DEBUG 2494 xfs_lsn_t tail_lsn; 2495 #endif 2496 2497 tic->t_curr_res = tic->t_unit_res; 2498 XLOG_TIC_RESET_RES(tic); 2499 2500 if (tic->t_cnt > 0) 2501 return (0); 2502 2503 #ifdef DEBUG 2504 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2505 panic("regrant Recovery problem"); 2506 #endif 2507 2508 s = GRANT_LOCK(log); 2509 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); 2510 2511 if (XLOG_FORCED_SHUTDOWN(log)) 2512 goto error_return; 2513 2514 /* If there are other waiters on the queue then give them a 2515 * chance at logspace before us. Wake up the first waiters, 2516 * if we do not wake up all the waiters then go to sleep waiting 2517 * for more free space, otherwise try to get some space for 2518 * this transaction. 2519 */ 2520 2521 if ((ntic = log->l_write_headq)) { 2522 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2523 log->l_grant_write_bytes); 2524 do { 2525 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); 2526 2527 if (free_bytes < ntic->t_unit_res) 2528 break; 2529 free_bytes -= ntic->t_unit_res; 2530 sv_signal(&ntic->t_sema); 2531 ntic = ntic->t_next; 2532 } while (ntic != log->l_write_headq); 2533 2534 if (ntic != log->l_write_headq) { 2535 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2536 XLOG_INS_TICKETQ(log->l_write_headq, tic); 2537 2538 xlog_trace_loggrant(log, tic, 2539 "xlog_regrant_write_log_space: sleep 1"); 2540 XFS_STATS_INC(xs_sleep_logspace); 2541 sv_wait(&tic->t_sema, PINOD|PLTWAIT, 2542 &log->l_grant_lock, s); 2543 2544 /* If we're shutting down, this tic is already 2545 * off the queue */ 2546 if (XLOG_FORCED_SHUTDOWN(log)) { 2547 s = GRANT_LOCK(log); 2548 goto error_return; 2549 } 2550 2551 xlog_trace_loggrant(log, tic, 2552 "xlog_regrant_write_log_space: wake 1"); 2553 xlog_grant_push_ail(log->l_mp, tic->t_unit_res); 2554 s = GRANT_LOCK(log); 2555 } 2556 } 2557 2558 need_bytes = tic->t_unit_res; 2559 2560 redo: 2561 if (XLOG_FORCED_SHUTDOWN(log)) 2562 goto error_return; 2563 2564 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2565 log->l_grant_write_bytes); 2566 if (free_bytes < need_bytes) { 2567 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2568 XLOG_INS_TICKETQ(log->l_write_headq, tic); 2569 XFS_STATS_INC(xs_sleep_logspace); 2570 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2571 2572 /* If we're shutting down, this tic is already off the queue */ 2573 if (XLOG_FORCED_SHUTDOWN(log)) { 2574 s = GRANT_LOCK(log); 2575 goto error_return; 2576 } 2577 2578 xlog_trace_loggrant(log, tic, 2579 "xlog_regrant_write_log_space: wake 2"); 2580 xlog_grant_push_ail(log->l_mp, need_bytes); 2581 s = GRANT_LOCK(log); 2582 goto redo; 2583 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2584 XLOG_DEL_TICKETQ(log->l_write_headq, tic); 2585 2586 XLOG_GRANT_ADD_SPACE(log, need_bytes, 'w'); /* we've got enough space */ 2587 #ifdef DEBUG 2588 tail_lsn = log->l_tail_lsn; 2589 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2590 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2591 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2592 } 2593 #endif 2594 2595 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); 2596 xlog_verify_grant_head(log, 1); 2597 GRANT_UNLOCK(log, s); 2598 return (0); 2599 2600 2601 error_return: 2602 if (tic->t_flags & XLOG_TIC_IN_Q) 2603 XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); 2604 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); 2605 /* 2606 * If we are failing, make sure the ticket doesn't have any 2607 * current reservations. We don't want to add this back when 2608 * the ticket/transaction gets cancelled. 2609 */ 2610 tic->t_curr_res = 0; 2611 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2612 GRANT_UNLOCK(log, s); 2613 return XFS_ERROR(EIO); 2614 } /* xlog_regrant_write_log_space */ 2615 2616 2617 /* The first cnt-1 times through here we don't need to 2618 * move the grant write head because the permanent 2619 * reservation has reserved cnt times the unit amount. 2620 * Release part of current permanent unit reservation and 2621 * reset current reservation to be one units worth. Also 2622 * move grant reservation head forward. 2623 */ 2624 STATIC void 2625 xlog_regrant_reserve_log_space(xlog_t *log, 2626 xlog_ticket_t *ticket) 2627 { 2628 SPLDECL(s); 2629 2630 xlog_trace_loggrant(log, ticket, 2631 "xlog_regrant_reserve_log_space: enter"); 2632 if (ticket->t_cnt > 0) 2633 ticket->t_cnt--; 2634 2635 s = GRANT_LOCK(log); 2636 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'w'); 2637 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r'); 2638 ticket->t_curr_res = ticket->t_unit_res; 2639 XLOG_TIC_RESET_RES(ticket); 2640 xlog_trace_loggrant(log, ticket, 2641 "xlog_regrant_reserve_log_space: sub current res"); 2642 xlog_verify_grant_head(log, 1); 2643 2644 /* just return if we still have some of the pre-reserved space */ 2645 if (ticket->t_cnt > 0) { 2646 GRANT_UNLOCK(log, s); 2647 return; 2648 } 2649 2650 XLOG_GRANT_ADD_SPACE(log, ticket->t_unit_res, 'r'); 2651 xlog_trace_loggrant(log, ticket, 2652 "xlog_regrant_reserve_log_space: exit"); 2653 xlog_verify_grant_head(log, 0); 2654 GRANT_UNLOCK(log, s); 2655 ticket->t_curr_res = ticket->t_unit_res; 2656 XLOG_TIC_RESET_RES(ticket); 2657 } /* xlog_regrant_reserve_log_space */ 2658 2659 2660 /* 2661 * Give back the space left from a reservation. 2662 * 2663 * All the information we need to make a correct determination of space left 2664 * is present. For non-permanent reservations, things are quite easy. The 2665 * count should have been decremented to zero. We only need to deal with the 2666 * space remaining in the current reservation part of the ticket. If the 2667 * ticket contains a permanent reservation, there may be left over space which 2668 * needs to be released. A count of N means that N-1 refills of the current 2669 * reservation can be done before we need to ask for more space. The first 2670 * one goes to fill up the first current reservation. Once we run out of 2671 * space, the count will stay at zero and the only space remaining will be 2672 * in the current reservation field. 2673 */ 2674 STATIC void 2675 xlog_ungrant_log_space(xlog_t *log, 2676 xlog_ticket_t *ticket) 2677 { 2678 SPLDECL(s); 2679 2680 if (ticket->t_cnt > 0) 2681 ticket->t_cnt--; 2682 2683 s = GRANT_LOCK(log); 2684 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); 2685 2686 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'w'); 2687 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r'); 2688 2689 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); 2690 2691 /* If this is a permanent reservation ticket, we may be able to free 2692 * up more space based on the remaining count. 2693 */ 2694 if (ticket->t_cnt > 0) { 2695 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); 2696 XLOG_GRANT_SUB_SPACE(log, ticket->t_unit_res*ticket->t_cnt,'w'); 2697 XLOG_GRANT_SUB_SPACE(log, ticket->t_unit_res*ticket->t_cnt,'r'); 2698 } 2699 2700 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); 2701 xlog_verify_grant_head(log, 1); 2702 GRANT_UNLOCK(log, s); 2703 xfs_log_move_tail(log->l_mp, 1); 2704 } /* xlog_ungrant_log_space */ 2705 2706 2707 /* 2708 * Atomically put back used ticket. 2709 */ 2710 void 2711 xlog_state_put_ticket(xlog_t *log, 2712 xlog_ticket_t *tic) 2713 { 2714 unsigned long s; 2715 2716 s = LOG_LOCK(log); 2717 xlog_ticket_put(log, tic); 2718 LOG_UNLOCK(log, s); 2719 } /* xlog_state_put_ticket */ 2720 2721 /* 2722 * Flush iclog to disk if this is the last reference to the given iclog and 2723 * the WANT_SYNC bit is set. 2724 * 2725 * When this function is entered, the iclog is not necessarily in the 2726 * WANT_SYNC state. It may be sitting around waiting to get filled. 2727 * 2728 * 2729 */ 2730 int 2731 xlog_state_release_iclog(xlog_t *log, 2732 xlog_in_core_t *iclog) 2733 { 2734 SPLDECL(s); 2735 int sync = 0; /* do we sync? */ 2736 2737 xlog_assign_tail_lsn(log->l_mp); 2738 2739 s = LOG_LOCK(log); 2740 2741 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2742 LOG_UNLOCK(log, s); 2743 return XFS_ERROR(EIO); 2744 } 2745 2746 ASSERT(iclog->ic_refcnt > 0); 2747 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || 2748 iclog->ic_state == XLOG_STATE_WANT_SYNC); 2749 2750 if (--iclog->ic_refcnt == 0 && 2751 iclog->ic_state == XLOG_STATE_WANT_SYNC) { 2752 sync++; 2753 iclog->ic_state = XLOG_STATE_SYNCING; 2754 INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn); 2755 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); 2756 /* cycle incremented when incrementing curr_block */ 2757 } 2758 2759 LOG_UNLOCK(log, s); 2760 2761 /* 2762 * We let the log lock go, so it's possible that we hit a log I/O 2763 * error or someother SHUTDOWN condition that marks the iclog 2764 * as XLOG_STATE_IOERROR before the bwrite. However, we know that 2765 * this iclog has consistent data, so we ignore IOERROR 2766 * flags after this point. 2767 */ 2768 if (sync) { 2769 return xlog_sync(log, iclog); 2770 } 2771 return (0); 2772 2773 } /* xlog_state_release_iclog */ 2774 2775 2776 /* 2777 * This routine will mark the current iclog in the ring as WANT_SYNC 2778 * and move the current iclog pointer to the next iclog in the ring. 2779 * When this routine is called from xlog_state_get_iclog_space(), the 2780 * exact size of the iclog has not yet been determined. All we know is 2781 * that every data block. We have run out of space in this log record. 2782 */ 2783 STATIC void 2784 xlog_state_switch_iclogs(xlog_t *log, 2785 xlog_in_core_t *iclog, 2786 int eventual_size) 2787 { 2788 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2789 if (!eventual_size) 2790 eventual_size = iclog->ic_offset; 2791 iclog->ic_state = XLOG_STATE_WANT_SYNC; 2792 INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block); 2793 log->l_prev_block = log->l_curr_block; 2794 log->l_prev_cycle = log->l_curr_cycle; 2795 2796 /* roll log?: ic_offset changed later */ 2797 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); 2798 2799 /* Round up to next log-sunit */ 2800 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 2801 log->l_mp->m_sb.sb_logsunit > 1) { 2802 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); 2803 log->l_curr_block = roundup(log->l_curr_block, sunit_bb); 2804 } 2805 2806 if (log->l_curr_block >= log->l_logBBsize) { 2807 log->l_curr_cycle++; 2808 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) 2809 log->l_curr_cycle++; 2810 log->l_curr_block -= log->l_logBBsize; 2811 ASSERT(log->l_curr_block >= 0); 2812 } 2813 ASSERT(iclog == log->l_iclog); 2814 log->l_iclog = iclog->ic_next; 2815 } /* xlog_state_switch_iclogs */ 2816 2817 2818 /* 2819 * Write out all data in the in-core log as of this exact moment in time. 2820 * 2821 * Data may be written to the in-core log during this call. However, 2822 * we don't guarantee this data will be written out. A change from past 2823 * implementation means this routine will *not* write out zero length LRs. 2824 * 2825 * Basically, we try and perform an intelligent scan of the in-core logs. 2826 * If we determine there is no flushable data, we just return. There is no 2827 * flushable data if: 2828 * 2829 * 1. the current iclog is active and has no data; the previous iclog 2830 * is in the active or dirty state. 2831 * 2. the current iclog is drity, and the previous iclog is in the 2832 * active or dirty state. 2833 * 2834 * We may sleep (call psema) if: 2835 * 2836 * 1. the current iclog is not in the active nor dirty state. 2837 * 2. the current iclog dirty, and the previous iclog is not in the 2838 * active nor dirty state. 2839 * 3. the current iclog is active, and there is another thread writing 2840 * to this particular iclog. 2841 * 4. a) the current iclog is active and has no other writers 2842 * b) when we return from flushing out this iclog, it is still 2843 * not in the active nor dirty state. 2844 */ 2845 STATIC int 2846 xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed) 2847 { 2848 xlog_in_core_t *iclog; 2849 xfs_lsn_t lsn; 2850 SPLDECL(s); 2851 2852 s = LOG_LOCK(log); 2853 2854 iclog = log->l_iclog; 2855 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2856 LOG_UNLOCK(log, s); 2857 return XFS_ERROR(EIO); 2858 } 2859 2860 /* If the head iclog is not active nor dirty, we just attach 2861 * ourselves to the head and go to sleep. 2862 */ 2863 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2864 iclog->ic_state == XLOG_STATE_DIRTY) { 2865 /* 2866 * If the head is dirty or (active and empty), then 2867 * we need to look at the previous iclog. If the previous 2868 * iclog is active or dirty we are done. There is nothing 2869 * to sync out. Otherwise, we attach ourselves to the 2870 * previous iclog and go to sleep. 2871 */ 2872 if (iclog->ic_state == XLOG_STATE_DIRTY || 2873 (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) { 2874 iclog = iclog->ic_prev; 2875 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2876 iclog->ic_state == XLOG_STATE_DIRTY) 2877 goto no_sleep; 2878 else 2879 goto maybe_sleep; 2880 } else { 2881 if (iclog->ic_refcnt == 0) { 2882 /* We are the only one with access to this 2883 * iclog. Flush it out now. There should 2884 * be a roundoff of zero to show that someone 2885 * has already taken care of the roundoff from 2886 * the previous sync. 2887 */ 2888 iclog->ic_refcnt++; 2889 lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2890 xlog_state_switch_iclogs(log, iclog, 0); 2891 LOG_UNLOCK(log, s); 2892 2893 if (xlog_state_release_iclog(log, iclog)) 2894 return XFS_ERROR(EIO); 2895 *log_flushed = 1; 2896 s = LOG_LOCK(log); 2897 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn && 2898 iclog->ic_state != XLOG_STATE_DIRTY) 2899 goto maybe_sleep; 2900 else 2901 goto no_sleep; 2902 } else { 2903 /* Someone else is writing to this iclog. 2904 * Use its call to flush out the data. However, 2905 * the other thread may not force out this LR, 2906 * so we mark it WANT_SYNC. 2907 */ 2908 xlog_state_switch_iclogs(log, iclog, 0); 2909 goto maybe_sleep; 2910 } 2911 } 2912 } 2913 2914 /* By the time we come around again, the iclog could've been filled 2915 * which would give it another lsn. If we have a new lsn, just 2916 * return because the relevant data has been flushed. 2917 */ 2918 maybe_sleep: 2919 if (flags & XFS_LOG_SYNC) { 2920 /* 2921 * We must check if we're shutting down here, before 2922 * we wait, while we're holding the LOG_LOCK. 2923 * Then we check again after waking up, in case our 2924 * sleep was disturbed by a bad news. 2925 */ 2926 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2927 LOG_UNLOCK(log, s); 2928 return XFS_ERROR(EIO); 2929 } 2930 XFS_STATS_INC(xs_log_force_sleep); 2931 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s); 2932 /* 2933 * No need to grab the log lock here since we're 2934 * only deciding whether or not to return EIO 2935 * and the memory read should be atomic. 2936 */ 2937 if (iclog->ic_state & XLOG_STATE_IOERROR) 2938 return XFS_ERROR(EIO); 2939 *log_flushed = 1; 2940 2941 } else { 2942 2943 no_sleep: 2944 LOG_UNLOCK(log, s); 2945 } 2946 return 0; 2947 } /* xlog_state_sync_all */ 2948 2949 2950 /* 2951 * Used by code which implements synchronous log forces. 2952 * 2953 * Find in-core log with lsn. 2954 * If it is in the DIRTY state, just return. 2955 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC 2956 * state and go to sleep or return. 2957 * If it is in any other state, go to sleep or return. 2958 * 2959 * If filesystem activity goes to zero, the iclog will get flushed only by 2960 * bdflush(). 2961 */ 2962 int 2963 xlog_state_sync(xlog_t *log, 2964 xfs_lsn_t lsn, 2965 uint flags, 2966 int *log_flushed) 2967 { 2968 xlog_in_core_t *iclog; 2969 int already_slept = 0; 2970 SPLDECL(s); 2971 2972 2973 try_again: 2974 s = LOG_LOCK(log); 2975 iclog = log->l_iclog; 2976 2977 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2978 LOG_UNLOCK(log, s); 2979 return XFS_ERROR(EIO); 2980 } 2981 2982 do { 2983 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) { 2984 iclog = iclog->ic_next; 2985 continue; 2986 } 2987 2988 if (iclog->ic_state == XLOG_STATE_DIRTY) { 2989 LOG_UNLOCK(log, s); 2990 return 0; 2991 } 2992 2993 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 2994 /* 2995 * We sleep here if we haven't already slept (e.g. 2996 * this is the first time we've looked at the correct 2997 * iclog buf) and the buffer before us is going to 2998 * be sync'ed. The reason for this is that if we 2999 * are doing sync transactions here, by waiting for 3000 * the previous I/O to complete, we can allow a few 3001 * more transactions into this iclog before we close 3002 * it down. 3003 * 3004 * Otherwise, we mark the buffer WANT_SYNC, and bump 3005 * up the refcnt so we can release the log (which drops 3006 * the ref count). The state switch keeps new transaction 3007 * commits from using this buffer. When the current commits 3008 * finish writing into the buffer, the refcount will drop to 3009 * zero and the buffer will go out then. 3010 */ 3011 if (!already_slept && 3012 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | 3013 XLOG_STATE_SYNCING))) { 3014 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); 3015 XFS_STATS_INC(xs_log_force_sleep); 3016 sv_wait(&iclog->ic_prev->ic_writesema, PSWP, 3017 &log->l_icloglock, s); 3018 *log_flushed = 1; 3019 already_slept = 1; 3020 goto try_again; 3021 } else { 3022 iclog->ic_refcnt++; 3023 xlog_state_switch_iclogs(log, iclog, 0); 3024 LOG_UNLOCK(log, s); 3025 if (xlog_state_release_iclog(log, iclog)) 3026 return XFS_ERROR(EIO); 3027 *log_flushed = 1; 3028 s = LOG_LOCK(log); 3029 } 3030 } 3031 3032 if ((flags & XFS_LOG_SYNC) && /* sleep */ 3033 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { 3034 3035 /* 3036 * Don't wait on the forcesema if we know that we've 3037 * gotten a log write error. 3038 */ 3039 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3040 LOG_UNLOCK(log, s); 3041 return XFS_ERROR(EIO); 3042 } 3043 XFS_STATS_INC(xs_log_force_sleep); 3044 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s); 3045 /* 3046 * No need to grab the log lock here since we're 3047 * only deciding whether or not to return EIO 3048 * and the memory read should be atomic. 3049 */ 3050 if (iclog->ic_state & XLOG_STATE_IOERROR) 3051 return XFS_ERROR(EIO); 3052 *log_flushed = 1; 3053 } else { /* just return */ 3054 LOG_UNLOCK(log, s); 3055 } 3056 return 0; 3057 3058 } while (iclog != log->l_iclog); 3059 3060 LOG_UNLOCK(log, s); 3061 return (0); 3062 } /* xlog_state_sync */ 3063 3064 3065 /* 3066 * Called when we want to mark the current iclog as being ready to sync to 3067 * disk. 3068 */ 3069 void 3070 xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) 3071 { 3072 SPLDECL(s); 3073 3074 s = LOG_LOCK(log); 3075 3076 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3077 xlog_state_switch_iclogs(log, iclog, 0); 3078 } else { 3079 ASSERT(iclog->ic_state & 3080 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); 3081 } 3082 3083 LOG_UNLOCK(log, s); 3084 } /* xlog_state_want_sync */ 3085 3086 3087 3088 /***************************************************************************** 3089 * 3090 * TICKET functions 3091 * 3092 ***************************************************************************** 3093 */ 3094 3095 /* 3096 * Algorithm doesn't take into account page size. ;-( 3097 */ 3098 STATIC void 3099 xlog_state_ticket_alloc(xlog_t *log) 3100 { 3101 xlog_ticket_t *t_list; 3102 xlog_ticket_t *next; 3103 xfs_caddr_t buf; 3104 uint i = (NBPP / sizeof(xlog_ticket_t)) - 2; 3105 SPLDECL(s); 3106 3107 /* 3108 * The kmem_zalloc may sleep, so we shouldn't be holding the 3109 * global lock. XXXmiken: may want to use zone allocator. 3110 */ 3111 buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP); 3112 3113 s = LOG_LOCK(log); 3114 3115 /* Attach 1st ticket to Q, so we can keep track of allocated memory */ 3116 t_list = (xlog_ticket_t *)buf; 3117 t_list->t_next = log->l_unmount_free; 3118 log->l_unmount_free = t_list++; 3119 log->l_ticket_cnt++; 3120 log->l_ticket_tcnt++; 3121 3122 /* Next ticket becomes first ticket attached to ticket free list */ 3123 if (log->l_freelist != NULL) { 3124 ASSERT(log->l_tail != NULL); 3125 log->l_tail->t_next = t_list; 3126 } else { 3127 log->l_freelist = t_list; 3128 } 3129 log->l_ticket_cnt++; 3130 log->l_ticket_tcnt++; 3131 3132 /* Cycle through rest of alloc'ed memory, building up free Q */ 3133 for ( ; i > 0; i--) { 3134 next = t_list + 1; 3135 t_list->t_next = next; 3136 t_list = next; 3137 log->l_ticket_cnt++; 3138 log->l_ticket_tcnt++; 3139 } 3140 t_list->t_next = NULL; 3141 log->l_tail = t_list; 3142 LOG_UNLOCK(log, s); 3143 } /* xlog_state_ticket_alloc */ 3144 3145 3146 /* 3147 * Put ticket into free list 3148 * 3149 * Assumption: log lock is held around this call. 3150 */ 3151 STATIC void 3152 xlog_ticket_put(xlog_t *log, 3153 xlog_ticket_t *ticket) 3154 { 3155 sv_destroy(&ticket->t_sema); 3156 3157 /* 3158 * Don't think caching will make that much difference. It's 3159 * more important to make debug easier. 3160 */ 3161 #if 0 3162 /* real code will want to use LIFO for caching */ 3163 ticket->t_next = log->l_freelist; 3164 log->l_freelist = ticket; 3165 /* no need to clear fields */ 3166 #else 3167 /* When we debug, it is easier if tickets are cycled */ 3168 ticket->t_next = NULL; 3169 if (log->l_tail != 0) { 3170 log->l_tail->t_next = ticket; 3171 } else { 3172 ASSERT(log->l_freelist == 0); 3173 log->l_freelist = ticket; 3174 } 3175 log->l_tail = ticket; 3176 #endif /* DEBUG */ 3177 log->l_ticket_cnt++; 3178 } /* xlog_ticket_put */ 3179 3180 3181 /* 3182 * Grab ticket off freelist or allocation some more 3183 */ 3184 xlog_ticket_t * 3185 xlog_ticket_get(xlog_t *log, 3186 int unit_bytes, 3187 int cnt, 3188 char client, 3189 uint xflags) 3190 { 3191 xlog_ticket_t *tic; 3192 uint num_headers; 3193 SPLDECL(s); 3194 3195 alloc: 3196 if (log->l_freelist == NULL) 3197 xlog_state_ticket_alloc(log); /* potentially sleep */ 3198 3199 s = LOG_LOCK(log); 3200 if (log->l_freelist == NULL) { 3201 LOG_UNLOCK(log, s); 3202 goto alloc; 3203 } 3204 tic = log->l_freelist; 3205 log->l_freelist = tic->t_next; 3206 if (log->l_freelist == NULL) 3207 log->l_tail = NULL; 3208 log->l_ticket_cnt--; 3209 LOG_UNLOCK(log, s); 3210 3211 /* 3212 * Permanent reservations have up to 'cnt'-1 active log operations 3213 * in the log. A unit in this case is the amount of space for one 3214 * of these log operations. Normal reservations have a cnt of 1 3215 * and their unit amount is the total amount of space required. 3216 * 3217 * The following lines of code account for non-transaction data 3218 * which occupy space in the on-disk log. 3219 * 3220 * Normal form of a transaction is: 3221 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> 3222 * and then there are LR hdrs, split-recs and roundoff at end of syncs. 3223 * 3224 * We need to account for all the leadup data and trailer data 3225 * around the transaction data. 3226 * And then we need to account for the worst case in terms of using 3227 * more space. 3228 * The worst case will happen if: 3229 * - the placement of the transaction happens to be such that the 3230 * roundoff is at its maximum 3231 * - the transaction data is synced before the commit record is synced 3232 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> 3233 * Therefore the commit record is in its own Log Record. 3234 * This can happen as the commit record is called with its 3235 * own region to xlog_write(). 3236 * This then means that in the worst case, roundoff can happen for 3237 * the commit-rec as well. 3238 * The commit-rec is smaller than padding in this scenario and so it is 3239 * not added separately. 3240 */ 3241 3242 /* for trans header */ 3243 unit_bytes += sizeof(xlog_op_header_t); 3244 unit_bytes += sizeof(xfs_trans_header_t); 3245 3246 /* for start-rec */ 3247 unit_bytes += sizeof(xlog_op_header_t); 3248 3249 /* for LR headers */ 3250 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); 3251 unit_bytes += log->l_iclog_hsize * num_headers; 3252 3253 /* for commit-rec LR header - note: padding will subsume the ophdr */ 3254 unit_bytes += log->l_iclog_hsize; 3255 3256 /* for split-recs - ophdrs added when data split over LRs */ 3257 unit_bytes += sizeof(xlog_op_header_t) * num_headers; 3258 3259 /* for roundoff padding for transaction data and one for commit record */ 3260 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 3261 log->l_mp->m_sb.sb_logsunit > 1) { 3262 /* log su roundoff */ 3263 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; 3264 } else { 3265 /* BB roundoff */ 3266 unit_bytes += 2*BBSIZE; 3267 } 3268 3269 tic->t_unit_res = unit_bytes; 3270 tic->t_curr_res = unit_bytes; 3271 tic->t_cnt = cnt; 3272 tic->t_ocnt = cnt; 3273 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); 3274 tic->t_clientid = client; 3275 tic->t_flags = XLOG_TIC_INITED; 3276 tic->t_trans_type = 0; 3277 if (xflags & XFS_LOG_PERM_RESERV) 3278 tic->t_flags |= XLOG_TIC_PERM_RESERV; 3279 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick"); 3280 3281 XLOG_TIC_RESET_RES(tic); 3282 3283 return tic; 3284 } /* xlog_ticket_get */ 3285 3286 3287 /****************************************************************************** 3288 * 3289 * Log debug routines 3290 * 3291 ****************************************************************************** 3292 */ 3293 #if defined(DEBUG) 3294 /* 3295 * Make sure that the destination ptr is within the valid data region of 3296 * one of the iclogs. This uses backup pointers stored in a different 3297 * part of the log in case we trash the log structure. 3298 */ 3299 void 3300 xlog_verify_dest_ptr(xlog_t *log, 3301 __psint_t ptr) 3302 { 3303 int i; 3304 int good_ptr = 0; 3305 3306 for (i=0; i < log->l_iclog_bufs; i++) { 3307 if (ptr >= (__psint_t)log->l_iclog_bak[i] && 3308 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) 3309 good_ptr++; 3310 } 3311 if (! good_ptr) 3312 xlog_panic("xlog_verify_dest_ptr: invalid ptr"); 3313 } /* xlog_verify_dest_ptr */ 3314 3315 STATIC void 3316 xlog_verify_grant_head(xlog_t *log, int equals) 3317 { 3318 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { 3319 if (equals) 3320 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); 3321 else 3322 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); 3323 } else { 3324 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); 3325 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); 3326 } 3327 } /* xlog_verify_grant_head */ 3328 3329 /* check if it will fit */ 3330 STATIC void 3331 xlog_verify_tail_lsn(xlog_t *log, 3332 xlog_in_core_t *iclog, 3333 xfs_lsn_t tail_lsn) 3334 { 3335 int blocks; 3336 3337 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { 3338 blocks = 3339 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); 3340 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) 3341 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3342 } else { 3343 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); 3344 3345 if (BLOCK_LSN(tail_lsn) == log->l_prev_block) 3346 xlog_panic("xlog_verify_tail_lsn: tail wrapped"); 3347 3348 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; 3349 if (blocks < BTOBB(iclog->ic_offset) + 1) 3350 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3351 } 3352 } /* xlog_verify_tail_lsn */ 3353 3354 /* 3355 * Perform a number of checks on the iclog before writing to disk. 3356 * 3357 * 1. Make sure the iclogs are still circular 3358 * 2. Make sure we have a good magic number 3359 * 3. Make sure we don't have magic numbers in the data 3360 * 4. Check fields of each log operation header for: 3361 * A. Valid client identifier 3362 * B. tid ptr value falls in valid ptr space (user space code) 3363 * C. Length in log record header is correct according to the 3364 * individual operation headers within record. 3365 * 5. When a bwrite will occur within 5 blocks of the front of the physical 3366 * log, check the preceding blocks of the physical log to make sure all 3367 * the cycle numbers agree with the current cycle number. 3368 */ 3369 STATIC void 3370 xlog_verify_iclog(xlog_t *log, 3371 xlog_in_core_t *iclog, 3372 int count, 3373 boolean_t syncing) 3374 { 3375 xlog_op_header_t *ophead; 3376 xlog_in_core_t *icptr; 3377 xlog_in_core_2_t *xhdr; 3378 xfs_caddr_t ptr; 3379 xfs_caddr_t base_ptr; 3380 __psint_t field_offset; 3381 __uint8_t clientid; 3382 int len, i, j, k, op_len; 3383 int idx; 3384 SPLDECL(s); 3385 3386 /* check validity of iclog pointers */ 3387 s = LOG_LOCK(log); 3388 icptr = log->l_iclog; 3389 for (i=0; i < log->l_iclog_bufs; i++) { 3390 if (icptr == 0) 3391 xlog_panic("xlog_verify_iclog: invalid ptr"); 3392 icptr = icptr->ic_next; 3393 } 3394 if (icptr != log->l_iclog) 3395 xlog_panic("xlog_verify_iclog: corrupt iclog ring"); 3396 LOG_UNLOCK(log, s); 3397 3398 /* check log magic numbers */ 3399 ptr = (xfs_caddr_t) &(iclog->ic_header); 3400 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM) 3401 xlog_panic("xlog_verify_iclog: invalid magic num"); 3402 3403 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count; 3404 ptr += BBSIZE) { 3405 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 3406 xlog_panic("xlog_verify_iclog: unexpected magic num"); 3407 } 3408 3409 /* check fields */ 3410 len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT); 3411 ptr = iclog->ic_datap; 3412 base_ptr = ptr; 3413 ophead = (xlog_op_header_t *)ptr; 3414 xhdr = (xlog_in_core_2_t *)&iclog->ic_header; 3415 for (i = 0; i < len; i++) { 3416 ophead = (xlog_op_header_t *)ptr; 3417 3418 /* clientid is only 1 byte */ 3419 field_offset = (__psint_t) 3420 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); 3421 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3422 clientid = ophead->oh_clientid; 3423 } else { 3424 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); 3425 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3426 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3427 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3428 clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3429 } else { 3430 clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3431 } 3432 } 3433 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) 3434 cmn_err(CE_WARN, "xlog_verify_iclog: " 3435 "invalid clientid %d op 0x%p offset 0x%lx", 3436 clientid, ophead, (unsigned long)field_offset); 3437 3438 /* check length */ 3439 field_offset = (__psint_t) 3440 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); 3441 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3442 op_len = INT_GET(ophead->oh_len, ARCH_CONVERT); 3443 } else { 3444 idx = BTOBBT((__psint_t)&ophead->oh_len - 3445 (__psint_t)iclog->ic_datap); 3446 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3447 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3448 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3449 op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3450 } else { 3451 op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3452 } 3453 } 3454 ptr += sizeof(xlog_op_header_t) + op_len; 3455 } 3456 } /* xlog_verify_iclog */ 3457 #endif 3458 3459 /* 3460 * Mark all iclogs IOERROR. LOG_LOCK is held by the caller. 3461 */ 3462 STATIC int 3463 xlog_state_ioerror( 3464 xlog_t *log) 3465 { 3466 xlog_in_core_t *iclog, *ic; 3467 3468 iclog = log->l_iclog; 3469 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { 3470 /* 3471 * Mark all the incore logs IOERROR. 3472 * From now on, no log flushes will result. 3473 */ 3474 ic = iclog; 3475 do { 3476 ic->ic_state = XLOG_STATE_IOERROR; 3477 ic = ic->ic_next; 3478 } while (ic != iclog); 3479 return (0); 3480 } 3481 /* 3482 * Return non-zero, if state transition has already happened. 3483 */ 3484 return (1); 3485 } 3486 3487 /* 3488 * This is called from xfs_force_shutdown, when we're forcibly 3489 * shutting down the filesystem, typically because of an IO error. 3490 * Our main objectives here are to make sure that: 3491 * a. the filesystem gets marked 'SHUTDOWN' for all interested 3492 * parties to find out, 'atomically'. 3493 * b. those who're sleeping on log reservations, pinned objects and 3494 * other resources get woken up, and be told the bad news. 3495 * c. nothing new gets queued up after (a) and (b) are done. 3496 * d. if !logerror, flush the iclogs to disk, then seal them off 3497 * for business. 3498 */ 3499 int 3500 xfs_log_force_umount( 3501 struct xfs_mount *mp, 3502 int logerror) 3503 { 3504 xlog_ticket_t *tic; 3505 xlog_t *log; 3506 int retval; 3507 int dummy; 3508 SPLDECL(s); 3509 SPLDECL(s2); 3510 3511 log = mp->m_log; 3512 3513 /* 3514 * If this happens during log recovery, don't worry about 3515 * locking; the log isn't open for business yet. 3516 */ 3517 if (!log || 3518 log->l_flags & XLOG_ACTIVE_RECOVERY) { 3519 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3520 XFS_BUF_DONE(mp->m_sb_bp); 3521 return (0); 3522 } 3523 3524 /* 3525 * Somebody could've already done the hard work for us. 3526 * No need to get locks for this. 3527 */ 3528 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { 3529 ASSERT(XLOG_FORCED_SHUTDOWN(log)); 3530 return (1); 3531 } 3532 retval = 0; 3533 /* 3534 * We must hold both the GRANT lock and the LOG lock, 3535 * before we mark the filesystem SHUTDOWN and wake 3536 * everybody up to tell the bad news. 3537 */ 3538 s = GRANT_LOCK(log); 3539 s2 = LOG_LOCK(log); 3540 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3541 XFS_BUF_DONE(mp->m_sb_bp); 3542 /* 3543 * This flag is sort of redundant because of the mount flag, but 3544 * it's good to maintain the separation between the log and the rest 3545 * of XFS. 3546 */ 3547 log->l_flags |= XLOG_IO_ERROR; 3548 3549 /* 3550 * If we hit a log error, we want to mark all the iclogs IOERROR 3551 * while we're still holding the loglock. 3552 */ 3553 if (logerror) 3554 retval = xlog_state_ioerror(log); 3555 LOG_UNLOCK(log, s2); 3556 3557 /* 3558 * We don't want anybody waiting for log reservations 3559 * after this. That means we have to wake up everybody 3560 * queued up on reserve_headq as well as write_headq. 3561 * In addition, we make sure in xlog_{re}grant_log_space 3562 * that we don't enqueue anything once the SHUTDOWN flag 3563 * is set, and this action is protected by the GRANTLOCK. 3564 */ 3565 if ((tic = log->l_reserve_headq)) { 3566 do { 3567 sv_signal(&tic->t_sema); 3568 tic = tic->t_next; 3569 } while (tic != log->l_reserve_headq); 3570 } 3571 3572 if ((tic = log->l_write_headq)) { 3573 do { 3574 sv_signal(&tic->t_sema); 3575 tic = tic->t_next; 3576 } while (tic != log->l_write_headq); 3577 } 3578 GRANT_UNLOCK(log, s); 3579 3580 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { 3581 ASSERT(!logerror); 3582 /* 3583 * Force the incore logs to disk before shutting the 3584 * log down completely. 3585 */ 3586 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy); 3587 s2 = LOG_LOCK(log); 3588 retval = xlog_state_ioerror(log); 3589 LOG_UNLOCK(log, s2); 3590 } 3591 /* 3592 * Wake up everybody waiting on xfs_log_force. 3593 * Callback all log item committed functions as if the 3594 * log writes were completed. 3595 */ 3596 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); 3597 3598 #ifdef XFSERRORDEBUG 3599 { 3600 xlog_in_core_t *iclog; 3601 3602 s = LOG_LOCK(log); 3603 iclog = log->l_iclog; 3604 do { 3605 ASSERT(iclog->ic_callback == 0); 3606 iclog = iclog->ic_next; 3607 } while (iclog != log->l_iclog); 3608 LOG_UNLOCK(log, s); 3609 } 3610 #endif 3611 /* return non-zero if log IOERROR transition had already happened */ 3612 return (retval); 3613 } 3614 3615 STATIC int 3616 xlog_iclogs_empty(xlog_t *log) 3617 { 3618 xlog_in_core_t *iclog; 3619 3620 iclog = log->l_iclog; 3621 do { 3622 /* endianness does not matter here, zero is zero in 3623 * any language. 3624 */ 3625 if (iclog->ic_header.h_num_logops) 3626 return(0); 3627 iclog = iclog->ic_next; 3628 } while (iclog != log->l_iclog); 3629 return(1); 3630 } 3631