1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_types.h" 21 #include "xfs_bit.h" 22 #include "xfs_log.h" 23 #include "xfs_inum.h" 24 #include "xfs_trans.h" 25 #include "xfs_sb.h" 26 #include "xfs_ag.h" 27 #include "xfs_dir2.h" 28 #include "xfs_dmapi.h" 29 #include "xfs_mount.h" 30 #include "xfs_error.h" 31 #include "xfs_log_priv.h" 32 #include "xfs_buf_item.h" 33 #include "xfs_bmap_btree.h" 34 #include "xfs_alloc_btree.h" 35 #include "xfs_ialloc_btree.h" 36 #include "xfs_log_recover.h" 37 #include "xfs_trans_priv.h" 38 #include "xfs_dir2_sf.h" 39 #include "xfs_attr_sf.h" 40 #include "xfs_dinode.h" 41 #include "xfs_inode.h" 42 #include "xfs_rw.h" 43 44 45 #define xlog_write_adv_cnt(ptr, len, off, bytes) \ 46 { (ptr) += (bytes); \ 47 (len) -= (bytes); \ 48 (off) += (bytes);} 49 50 /* Local miscellaneous function prototypes */ 51 STATIC int xlog_bdstrat_cb(struct xfs_buf *); 52 STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket, 53 xlog_in_core_t **, xfs_lsn_t *); 54 STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, 55 xfs_buftarg_t *log_target, 56 xfs_daddr_t blk_offset, 57 int num_bblks); 58 STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes); 59 STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); 60 STATIC void xlog_dealloc_log(xlog_t *log); 61 STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[], 62 int nentries, xfs_log_ticket_t tic, 63 xfs_lsn_t *start_lsn, 64 xlog_in_core_t **commit_iclog, 65 uint flags); 66 67 /* local state machine functions */ 68 STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); 69 STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); 70 STATIC int xlog_state_get_iclog_space(xlog_t *log, 71 int len, 72 xlog_in_core_t **iclog, 73 xlog_ticket_t *ticket, 74 int *continued_write, 75 int *logoffsetp); 76 STATIC void xlog_state_put_ticket(xlog_t *log, 77 xlog_ticket_t *tic); 78 STATIC int xlog_state_release_iclog(xlog_t *log, 79 xlog_in_core_t *iclog); 80 STATIC void xlog_state_switch_iclogs(xlog_t *log, 81 xlog_in_core_t *iclog, 82 int eventual_size); 83 STATIC int xlog_state_sync(xlog_t *log, 84 xfs_lsn_t lsn, 85 uint flags, 86 int *log_flushed); 87 STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed); 88 STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); 89 90 /* local functions to manipulate grant head */ 91 STATIC int xlog_grant_log_space(xlog_t *log, 92 xlog_ticket_t *xtic); 93 STATIC void xlog_grant_push_ail(xfs_mount_t *mp, 94 int need_bytes); 95 STATIC void xlog_regrant_reserve_log_space(xlog_t *log, 96 xlog_ticket_t *ticket); 97 STATIC int xlog_regrant_write_log_space(xlog_t *log, 98 xlog_ticket_t *ticket); 99 STATIC void xlog_ungrant_log_space(xlog_t *log, 100 xlog_ticket_t *ticket); 101 102 103 /* local ticket functions */ 104 STATIC void xlog_state_ticket_alloc(xlog_t *log); 105 STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log, 106 int unit_bytes, 107 int count, 108 char clientid, 109 uint flags); 110 STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket); 111 112 #if defined(DEBUG) 113 STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); 114 STATIC void xlog_verify_grant_head(xlog_t *log, int equals); 115 STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, 116 int count, boolean_t syncing); 117 STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, 118 xfs_lsn_t tail_lsn); 119 #else 120 #define xlog_verify_dest_ptr(a,b) 121 #define xlog_verify_grant_head(a,b) 122 #define xlog_verify_iclog(a,b,c,d) 123 #define xlog_verify_tail_lsn(a,b,c) 124 #endif 125 126 STATIC int xlog_iclogs_empty(xlog_t *log); 127 128 #if defined(XFS_LOG_TRACE) 129 void 130 xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string) 131 { 132 unsigned long cnts; 133 134 if (!log->l_grant_trace) { 135 log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP); 136 if (!log->l_grant_trace) 137 return; 138 } 139 /* ticket counts are 1 byte each */ 140 cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8; 141 142 ktrace_enter(log->l_grant_trace, 143 (void *)tic, 144 (void *)log->l_reserve_headq, 145 (void *)log->l_write_headq, 146 (void *)((unsigned long)log->l_grant_reserve_cycle), 147 (void *)((unsigned long)log->l_grant_reserve_bytes), 148 (void *)((unsigned long)log->l_grant_write_cycle), 149 (void *)((unsigned long)log->l_grant_write_bytes), 150 (void *)((unsigned long)log->l_curr_cycle), 151 (void *)((unsigned long)log->l_curr_block), 152 (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)), 153 (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)), 154 (void *)string, 155 (void *)((unsigned long)tic->t_trans_type), 156 (void *)cnts, 157 (void *)((unsigned long)tic->t_curr_res), 158 (void *)((unsigned long)tic->t_unit_res)); 159 } 160 161 void 162 xlog_trace_iclog(xlog_in_core_t *iclog, uint state) 163 { 164 if (!iclog->ic_trace) 165 iclog->ic_trace = ktrace_alloc(256, KM_SLEEP); 166 ktrace_enter(iclog->ic_trace, 167 (void *)((unsigned long)state), 168 (void *)((unsigned long)current_pid()), 169 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, 170 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, 171 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, 172 (void *)NULL, (void *)NULL); 173 } 174 #else 175 #define xlog_trace_loggrant(log,tic,string) 176 #define xlog_trace_iclog(iclog,state) 177 #endif /* XFS_LOG_TRACE */ 178 179 180 static void 181 xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) 182 { 183 if (*qp) { 184 tic->t_next = (*qp); 185 tic->t_prev = (*qp)->t_prev; 186 (*qp)->t_prev->t_next = tic; 187 (*qp)->t_prev = tic; 188 } else { 189 tic->t_prev = tic->t_next = tic; 190 *qp = tic; 191 } 192 193 tic->t_flags |= XLOG_TIC_IN_Q; 194 } 195 196 static void 197 xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) 198 { 199 if (tic == tic->t_next) { 200 *qp = NULL; 201 } else { 202 *qp = tic->t_next; 203 tic->t_next->t_prev = tic->t_prev; 204 tic->t_prev->t_next = tic->t_next; 205 } 206 207 tic->t_next = tic->t_prev = NULL; 208 tic->t_flags &= ~XLOG_TIC_IN_Q; 209 } 210 211 static void 212 xlog_grant_sub_space(struct log *log, int bytes) 213 { 214 log->l_grant_write_bytes -= bytes; 215 if (log->l_grant_write_bytes < 0) { 216 log->l_grant_write_bytes += log->l_logsize; 217 log->l_grant_write_cycle--; 218 } 219 220 log->l_grant_reserve_bytes -= bytes; 221 if ((log)->l_grant_reserve_bytes < 0) { 222 log->l_grant_reserve_bytes += log->l_logsize; 223 log->l_grant_reserve_cycle--; 224 } 225 226 } 227 228 static void 229 xlog_grant_add_space_write(struct log *log, int bytes) 230 { 231 log->l_grant_write_bytes += bytes; 232 if (log->l_grant_write_bytes > log->l_logsize) { 233 log->l_grant_write_bytes -= log->l_logsize; 234 log->l_grant_write_cycle++; 235 } 236 } 237 238 static void 239 xlog_grant_add_space_reserve(struct log *log, int bytes) 240 { 241 log->l_grant_reserve_bytes += bytes; 242 if (log->l_grant_reserve_bytes > log->l_logsize) { 243 log->l_grant_reserve_bytes -= log->l_logsize; 244 log->l_grant_reserve_cycle++; 245 } 246 } 247 248 static inline void 249 xlog_grant_add_space(struct log *log, int bytes) 250 { 251 xlog_grant_add_space_write(log, bytes); 252 xlog_grant_add_space_reserve(log, bytes); 253 } 254 255 256 /* 257 * NOTES: 258 * 259 * 1. currblock field gets updated at startup and after in-core logs 260 * marked as with WANT_SYNC. 261 */ 262 263 /* 264 * This routine is called when a user of a log manager ticket is done with 265 * the reservation. If the ticket was ever used, then a commit record for 266 * the associated transaction is written out as a log operation header with 267 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with 268 * a given ticket. If the ticket was one with a permanent reservation, then 269 * a few operations are done differently. Permanent reservation tickets by 270 * default don't release the reservation. They just commit the current 271 * transaction with the belief that the reservation is still needed. A flag 272 * must be passed in before permanent reservations are actually released. 273 * When these type of tickets are not released, they need to be set into 274 * the inited state again. By doing this, a start record will be written 275 * out when the next write occurs. 276 */ 277 xfs_lsn_t 278 xfs_log_done(xfs_mount_t *mp, 279 xfs_log_ticket_t xtic, 280 void **iclog, 281 uint flags) 282 { 283 xlog_t *log = mp->m_log; 284 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; 285 xfs_lsn_t lsn = 0; 286 287 if (XLOG_FORCED_SHUTDOWN(log) || 288 /* 289 * If nothing was ever written, don't write out commit record. 290 * If we get an error, just continue and give back the log ticket. 291 */ 292 (((ticket->t_flags & XLOG_TIC_INITED) == 0) && 293 (xlog_commit_record(mp, ticket, 294 (xlog_in_core_t **)iclog, &lsn)))) { 295 lsn = (xfs_lsn_t) -1; 296 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { 297 flags |= XFS_LOG_REL_PERM_RESERV; 298 } 299 } 300 301 302 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || 303 (flags & XFS_LOG_REL_PERM_RESERV)) { 304 /* 305 * Release ticket if not permanent reservation or a specific 306 * request has been made to release a permanent reservation. 307 */ 308 xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)"); 309 xlog_ungrant_log_space(log, ticket); 310 xlog_state_put_ticket(log, ticket); 311 } else { 312 xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)"); 313 xlog_regrant_reserve_log_space(log, ticket); 314 } 315 316 /* If this ticket was a permanent reservation and we aren't 317 * trying to release it, reset the inited flags; so next time 318 * we write, a start record will be written out. 319 */ 320 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) && 321 (flags & XFS_LOG_REL_PERM_RESERV) == 0) 322 ticket->t_flags |= XLOG_TIC_INITED; 323 324 return lsn; 325 } /* xfs_log_done */ 326 327 328 /* 329 * Force the in-core log to disk. If flags == XFS_LOG_SYNC, 330 * the force is done synchronously. 331 * 332 * Asynchronous forces are implemented by setting the WANT_SYNC 333 * bit in the appropriate in-core log and then returning. 334 * 335 * Synchronous forces are implemented with a semaphore. All callers 336 * to force a given lsn to disk will wait on a semaphore attached to the 337 * specific in-core log. When given in-core log finally completes its 338 * write to disk, that thread will wake up all threads waiting on the 339 * semaphore. 340 */ 341 int 342 _xfs_log_force( 343 xfs_mount_t *mp, 344 xfs_lsn_t lsn, 345 uint flags, 346 int *log_flushed) 347 { 348 xlog_t *log = mp->m_log; 349 int dummy; 350 351 if (!log_flushed) 352 log_flushed = &dummy; 353 354 ASSERT(flags & XFS_LOG_FORCE); 355 356 XFS_STATS_INC(xs_log_force); 357 358 if (log->l_flags & XLOG_IO_ERROR) 359 return XFS_ERROR(EIO); 360 if (lsn == 0) 361 return xlog_state_sync_all(log, flags, log_flushed); 362 else 363 return xlog_state_sync(log, lsn, flags, log_flushed); 364 } /* xfs_log_force */ 365 366 /* 367 * Attaches a new iclog I/O completion callback routine during 368 * transaction commit. If the log is in error state, a non-zero 369 * return code is handed back and the caller is responsible for 370 * executing the callback at an appropriate time. 371 */ 372 int 373 xfs_log_notify(xfs_mount_t *mp, /* mount of partition */ 374 void *iclog_hndl, /* iclog to hang callback off */ 375 xfs_log_callback_t *cb) 376 { 377 xlog_t *log = mp->m_log; 378 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 379 int abortflg, spl; 380 381 cb->cb_next = NULL; 382 spl = LOG_LOCK(log); 383 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); 384 if (!abortflg) { 385 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || 386 (iclog->ic_state == XLOG_STATE_WANT_SYNC)); 387 cb->cb_next = NULL; 388 *(iclog->ic_callback_tail) = cb; 389 iclog->ic_callback_tail = &(cb->cb_next); 390 } 391 LOG_UNLOCK(log, spl); 392 return abortflg; 393 } /* xfs_log_notify */ 394 395 int 396 xfs_log_release_iclog(xfs_mount_t *mp, 397 void *iclog_hndl) 398 { 399 xlog_t *log = mp->m_log; 400 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 401 402 if (xlog_state_release_iclog(log, iclog)) { 403 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 404 return EIO; 405 } 406 407 return 0; 408 } 409 410 /* 411 * 1. Reserve an amount of on-disk log space and return a ticket corresponding 412 * to the reservation. 413 * 2. Potentially, push buffers at tail of log to disk. 414 * 415 * Each reservation is going to reserve extra space for a log record header. 416 * When writes happen to the on-disk log, we don't subtract the length of the 417 * log record header from any reservation. By wasting space in each 418 * reservation, we prevent over allocation problems. 419 */ 420 int 421 xfs_log_reserve(xfs_mount_t *mp, 422 int unit_bytes, 423 int cnt, 424 xfs_log_ticket_t *ticket, 425 __uint8_t client, 426 uint flags, 427 uint t_type) 428 { 429 xlog_t *log = mp->m_log; 430 xlog_ticket_t *internal_ticket; 431 int retval = 0; 432 433 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); 434 ASSERT((flags & XFS_LOG_NOSLEEP) == 0); 435 436 if (XLOG_FORCED_SHUTDOWN(log)) 437 return XFS_ERROR(EIO); 438 439 XFS_STATS_INC(xs_try_logspace); 440 441 if (*ticket != NULL) { 442 ASSERT(flags & XFS_LOG_PERM_RESERV); 443 internal_ticket = (xlog_ticket_t *)*ticket; 444 xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)"); 445 xlog_grant_push_ail(mp, internal_ticket->t_unit_res); 446 retval = xlog_regrant_write_log_space(log, internal_ticket); 447 } else { 448 /* may sleep if need to allocate more tickets */ 449 internal_ticket = xlog_ticket_get(log, unit_bytes, cnt, 450 client, flags); 451 internal_ticket->t_trans_type = t_type; 452 *ticket = internal_ticket; 453 xlog_trace_loggrant(log, internal_ticket, 454 (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ? 455 "xfs_log_reserve: create new ticket (permanent trans)" : 456 "xfs_log_reserve: create new ticket"); 457 xlog_grant_push_ail(mp, 458 (internal_ticket->t_unit_res * 459 internal_ticket->t_cnt)); 460 retval = xlog_grant_log_space(log, internal_ticket); 461 } 462 463 return retval; 464 } /* xfs_log_reserve */ 465 466 467 /* 468 * Mount a log filesystem 469 * 470 * mp - ubiquitous xfs mount point structure 471 * log_target - buftarg of on-disk log device 472 * blk_offset - Start block # where block size is 512 bytes (BBSIZE) 473 * num_bblocks - Number of BBSIZE blocks in on-disk log 474 * 475 * Return error or zero. 476 */ 477 int 478 xfs_log_mount(xfs_mount_t *mp, 479 xfs_buftarg_t *log_target, 480 xfs_daddr_t blk_offset, 481 int num_bblks) 482 { 483 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 484 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); 485 else { 486 cmn_err(CE_NOTE, 487 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", 488 mp->m_fsname); 489 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); 490 } 491 492 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); 493 494 /* 495 * skip log recovery on a norecovery mount. pretend it all 496 * just worked. 497 */ 498 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { 499 bhv_vfs_t *vfsp = XFS_MTOVFS(mp); 500 int error, readonly = (vfsp->vfs_flag & VFS_RDONLY); 501 502 if (readonly) 503 vfsp->vfs_flag &= ~VFS_RDONLY; 504 505 error = xlog_recover(mp->m_log); 506 507 if (readonly) 508 vfsp->vfs_flag |= VFS_RDONLY; 509 if (error) { 510 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); 511 xlog_dealloc_log(mp->m_log); 512 return error; 513 } 514 } 515 516 /* Normal transactions can now occur */ 517 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; 518 519 /* End mounting message in xfs_log_mount_finish */ 520 return 0; 521 } /* xfs_log_mount */ 522 523 /* 524 * Finish the recovery of the file system. This is separate from 525 * the xfs_log_mount() call, because it depends on the code in 526 * xfs_mountfs() to read in the root and real-time bitmap inodes 527 * between calling xfs_log_mount() and here. 528 * 529 * mp - ubiquitous xfs mount point structure 530 */ 531 int 532 xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags) 533 { 534 int error; 535 536 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 537 error = xlog_recover_finish(mp->m_log, mfsi_flags); 538 else { 539 error = 0; 540 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); 541 } 542 543 return error; 544 } 545 546 /* 547 * Unmount processing for the log. 548 */ 549 int 550 xfs_log_unmount(xfs_mount_t *mp) 551 { 552 int error; 553 554 error = xfs_log_unmount_write(mp); 555 xfs_log_unmount_dealloc(mp); 556 return error; 557 } 558 559 /* 560 * Final log writes as part of unmount. 561 * 562 * Mark the filesystem clean as unmount happens. Note that during relocation 563 * this routine needs to be executed as part of source-bag while the 564 * deallocation must not be done until source-end. 565 */ 566 567 /* 568 * Unmount record used to have a string "Unmount filesystem--" in the 569 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). 570 * We just write the magic number now since that particular field isn't 571 * currently architecture converted and "nUmount" is a bit foo. 572 * As far as I know, there weren't any dependencies on the old behaviour. 573 */ 574 575 int 576 xfs_log_unmount_write(xfs_mount_t *mp) 577 { 578 xlog_t *log = mp->m_log; 579 xlog_in_core_t *iclog; 580 #ifdef DEBUG 581 xlog_in_core_t *first_iclog; 582 #endif 583 xfs_log_iovec_t reg[1]; 584 xfs_log_ticket_t tic = NULL; 585 xfs_lsn_t lsn; 586 int error; 587 SPLDECL(s); 588 589 /* the data section must be 32 bit size aligned */ 590 struct { 591 __uint16_t magic; 592 __uint16_t pad1; 593 __uint32_t pad2; /* may as well make it 64 bits */ 594 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; 595 596 /* 597 * Don't write out unmount record on read-only mounts. 598 * Or, if we are doing a forced umount (typically because of IO errors). 599 */ 600 if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY) 601 return 0; 602 603 xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC); 604 605 #ifdef DEBUG 606 first_iclog = iclog = log->l_iclog; 607 do { 608 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 609 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); 610 ASSERT(iclog->ic_offset == 0); 611 } 612 iclog = iclog->ic_next; 613 } while (iclog != first_iclog); 614 #endif 615 if (! (XLOG_FORCED_SHUTDOWN(log))) { 616 reg[0].i_addr = (void*)&magic; 617 reg[0].i_len = sizeof(magic); 618 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT); 619 620 error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0, 0); 621 if (!error) { 622 /* remove inited flag */ 623 ((xlog_ticket_t *)tic)->t_flags = 0; 624 error = xlog_write(mp, reg, 1, tic, &lsn, 625 NULL, XLOG_UNMOUNT_TRANS); 626 /* 627 * At this point, we're umounting anyway, 628 * so there's no point in transitioning log state 629 * to IOERROR. Just continue... 630 */ 631 } 632 633 if (error) { 634 xfs_fs_cmn_err(CE_ALERT, mp, 635 "xfs_log_unmount: unmount record failed"); 636 } 637 638 639 s = LOG_LOCK(log); 640 iclog = log->l_iclog; 641 iclog->ic_refcnt++; 642 LOG_UNLOCK(log, s); 643 xlog_state_want_sync(log, iclog); 644 (void) xlog_state_release_iclog(log, iclog); 645 646 s = LOG_LOCK(log); 647 if (!(iclog->ic_state == XLOG_STATE_ACTIVE || 648 iclog->ic_state == XLOG_STATE_DIRTY)) { 649 if (!XLOG_FORCED_SHUTDOWN(log)) { 650 sv_wait(&iclog->ic_forcesema, PMEM, 651 &log->l_icloglock, s); 652 } else { 653 LOG_UNLOCK(log, s); 654 } 655 } else { 656 LOG_UNLOCK(log, s); 657 } 658 if (tic) 659 xlog_state_put_ticket(log, tic); 660 } else { 661 /* 662 * We're already in forced_shutdown mode, couldn't 663 * even attempt to write out the unmount transaction. 664 * 665 * Go through the motions of sync'ing and releasing 666 * the iclog, even though no I/O will actually happen, 667 * we need to wait for other log I/Os that may already 668 * be in progress. Do this as a separate section of 669 * code so we'll know if we ever get stuck here that 670 * we're in this odd situation of trying to unmount 671 * a file system that went into forced_shutdown as 672 * the result of an unmount.. 673 */ 674 s = LOG_LOCK(log); 675 iclog = log->l_iclog; 676 iclog->ic_refcnt++; 677 LOG_UNLOCK(log, s); 678 679 xlog_state_want_sync(log, iclog); 680 (void) xlog_state_release_iclog(log, iclog); 681 682 s = LOG_LOCK(log); 683 684 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE 685 || iclog->ic_state == XLOG_STATE_DIRTY 686 || iclog->ic_state == XLOG_STATE_IOERROR) ) { 687 688 sv_wait(&iclog->ic_forcesema, PMEM, 689 &log->l_icloglock, s); 690 } else { 691 LOG_UNLOCK(log, s); 692 } 693 } 694 695 return 0; 696 } /* xfs_log_unmount_write */ 697 698 /* 699 * Deallocate log structures for unmount/relocation. 700 */ 701 void 702 xfs_log_unmount_dealloc(xfs_mount_t *mp) 703 { 704 xlog_dealloc_log(mp->m_log); 705 } 706 707 /* 708 * Write region vectors to log. The write happens using the space reservation 709 * of the ticket (tic). It is not a requirement that all writes for a given 710 * transaction occur with one call to xfs_log_write(). 711 */ 712 int 713 xfs_log_write(xfs_mount_t * mp, 714 xfs_log_iovec_t reg[], 715 int nentries, 716 xfs_log_ticket_t tic, 717 xfs_lsn_t *start_lsn) 718 { 719 int error; 720 xlog_t *log = mp->m_log; 721 722 if (XLOG_FORCED_SHUTDOWN(log)) 723 return XFS_ERROR(EIO); 724 725 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { 726 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 727 } 728 return error; 729 } /* xfs_log_write */ 730 731 732 void 733 xfs_log_move_tail(xfs_mount_t *mp, 734 xfs_lsn_t tail_lsn) 735 { 736 xlog_ticket_t *tic; 737 xlog_t *log = mp->m_log; 738 int need_bytes, free_bytes, cycle, bytes; 739 SPLDECL(s); 740 741 if (XLOG_FORCED_SHUTDOWN(log)) 742 return; 743 ASSERT(!XFS_FORCED_SHUTDOWN(mp)); 744 745 if (tail_lsn == 0) { 746 /* needed since sync_lsn is 64 bits */ 747 s = LOG_LOCK(log); 748 tail_lsn = log->l_last_sync_lsn; 749 LOG_UNLOCK(log, s); 750 } 751 752 s = GRANT_LOCK(log); 753 754 /* Also an invalid lsn. 1 implies that we aren't passing in a valid 755 * tail_lsn. 756 */ 757 if (tail_lsn != 1) { 758 log->l_tail_lsn = tail_lsn; 759 } 760 761 if ((tic = log->l_write_headq)) { 762 #ifdef DEBUG 763 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 764 panic("Recovery problem"); 765 #endif 766 cycle = log->l_grant_write_cycle; 767 bytes = log->l_grant_write_bytes; 768 free_bytes = xlog_space_left(log, cycle, bytes); 769 do { 770 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); 771 772 if (free_bytes < tic->t_unit_res && tail_lsn != 1) 773 break; 774 tail_lsn = 0; 775 free_bytes -= tic->t_unit_res; 776 sv_signal(&tic->t_sema); 777 tic = tic->t_next; 778 } while (tic != log->l_write_headq); 779 } 780 if ((tic = log->l_reserve_headq)) { 781 #ifdef DEBUG 782 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 783 panic("Recovery problem"); 784 #endif 785 cycle = log->l_grant_reserve_cycle; 786 bytes = log->l_grant_reserve_bytes; 787 free_bytes = xlog_space_left(log, cycle, bytes); 788 do { 789 if (tic->t_flags & XLOG_TIC_PERM_RESERV) 790 need_bytes = tic->t_unit_res*tic->t_cnt; 791 else 792 need_bytes = tic->t_unit_res; 793 if (free_bytes < need_bytes && tail_lsn != 1) 794 break; 795 tail_lsn = 0; 796 free_bytes -= need_bytes; 797 sv_signal(&tic->t_sema); 798 tic = tic->t_next; 799 } while (tic != log->l_reserve_headq); 800 } 801 GRANT_UNLOCK(log, s); 802 } /* xfs_log_move_tail */ 803 804 /* 805 * Determine if we have a transaction that has gone to disk 806 * that needs to be covered. Log activity needs to be idle (no AIL and 807 * nothing in the iclogs). And, we need to be in the right state indicating 808 * something has gone out. 809 */ 810 int 811 xfs_log_need_covered(xfs_mount_t *mp) 812 { 813 SPLDECL(s); 814 int needed = 0, gen; 815 xlog_t *log = mp->m_log; 816 bhv_vfs_t *vfsp = XFS_MTOVFS(mp); 817 818 if (vfs_test_for_freeze(vfsp) || XFS_FORCED_SHUTDOWN(mp) || 819 (vfsp->vfs_flag & VFS_RDONLY)) 820 return 0; 821 822 s = LOG_LOCK(log); 823 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || 824 (log->l_covered_state == XLOG_STATE_COVER_NEED2)) 825 && !xfs_trans_first_ail(mp, &gen) 826 && xlog_iclogs_empty(log)) { 827 if (log->l_covered_state == XLOG_STATE_COVER_NEED) 828 log->l_covered_state = XLOG_STATE_COVER_DONE; 829 else { 830 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); 831 log->l_covered_state = XLOG_STATE_COVER_DONE2; 832 } 833 needed = 1; 834 } 835 LOG_UNLOCK(log, s); 836 return needed; 837 } 838 839 /****************************************************************************** 840 * 841 * local routines 842 * 843 ****************************************************************************** 844 */ 845 846 /* xfs_trans_tail_ail returns 0 when there is nothing in the list. 847 * The log manager must keep track of the last LR which was committed 848 * to disk. The lsn of this LR will become the new tail_lsn whenever 849 * xfs_trans_tail_ail returns 0. If we don't do this, we run into 850 * the situation where stuff could be written into the log but nothing 851 * was ever in the AIL when asked. Eventually, we panic since the 852 * tail hits the head. 853 * 854 * We may be holding the log iclog lock upon entering this routine. 855 */ 856 xfs_lsn_t 857 xlog_assign_tail_lsn(xfs_mount_t *mp) 858 { 859 xfs_lsn_t tail_lsn; 860 SPLDECL(s); 861 xlog_t *log = mp->m_log; 862 863 tail_lsn = xfs_trans_tail_ail(mp); 864 s = GRANT_LOCK(log); 865 if (tail_lsn != 0) { 866 log->l_tail_lsn = tail_lsn; 867 } else { 868 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; 869 } 870 GRANT_UNLOCK(log, s); 871 872 return tail_lsn; 873 } /* xlog_assign_tail_lsn */ 874 875 876 /* 877 * Return the space in the log between the tail and the head. The head 878 * is passed in the cycle/bytes formal parms. In the special case where 879 * the reserve head has wrapped passed the tail, this calculation is no 880 * longer valid. In this case, just return 0 which means there is no space 881 * in the log. This works for all places where this function is called 882 * with the reserve head. Of course, if the write head were to ever 883 * wrap the tail, we should blow up. Rather than catch this case here, 884 * we depend on other ASSERTions in other parts of the code. XXXmiken 885 * 886 * This code also handles the case where the reservation head is behind 887 * the tail. The details of this case are described below, but the end 888 * result is that we return the size of the log as the amount of space left. 889 */ 890 int 891 xlog_space_left(xlog_t *log, int cycle, int bytes) 892 { 893 int free_bytes; 894 int tail_bytes; 895 int tail_cycle; 896 897 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); 898 tail_cycle = CYCLE_LSN(log->l_tail_lsn); 899 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { 900 free_bytes = log->l_logsize - (bytes - tail_bytes); 901 } else if ((tail_cycle + 1) < cycle) { 902 return 0; 903 } else if (tail_cycle < cycle) { 904 ASSERT(tail_cycle == (cycle - 1)); 905 free_bytes = tail_bytes - bytes; 906 } else { 907 /* 908 * The reservation head is behind the tail. 909 * In this case we just want to return the size of the 910 * log as the amount of space left. 911 */ 912 xfs_fs_cmn_err(CE_ALERT, log->l_mp, 913 "xlog_space_left: head behind tail\n" 914 " tail_cycle = %d, tail_bytes = %d\n" 915 " GH cycle = %d, GH bytes = %d", 916 tail_cycle, tail_bytes, cycle, bytes); 917 ASSERT(0); 918 free_bytes = log->l_logsize; 919 } 920 return free_bytes; 921 } /* xlog_space_left */ 922 923 924 /* 925 * Log function which is called when an io completes. 926 * 927 * The log manager needs its own routine, in order to control what 928 * happens with the buffer after the write completes. 929 */ 930 void 931 xlog_iodone(xfs_buf_t *bp) 932 { 933 xlog_in_core_t *iclog; 934 xlog_t *l; 935 int aborted; 936 937 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 938 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); 939 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 940 aborted = 0; 941 942 /* 943 * Some versions of cpp barf on the recursive definition of 944 * ic_log -> hic_fields.ic_log and expand ic_log twice when 945 * it is passed through two macros. Workaround broken cpp. 946 */ 947 l = iclog->ic_log; 948 949 /* 950 * Race to shutdown the filesystem if we see an error. 951 */ 952 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, 953 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { 954 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); 955 XFS_BUF_STALE(bp); 956 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); 957 /* 958 * This flag will be propagated to the trans-committed 959 * callback routines to let them know that the log-commit 960 * didn't succeed. 961 */ 962 aborted = XFS_LI_ABORTED; 963 } else if (iclog->ic_state & XLOG_STATE_IOERROR) { 964 aborted = XFS_LI_ABORTED; 965 } 966 xlog_state_done_syncing(iclog, aborted); 967 if (!(XFS_BUF_ISASYNC(bp))) { 968 /* 969 * Corresponding psema() will be done in bwrite(). If we don't 970 * vsema() here, panic. 971 */ 972 XFS_BUF_V_IODONESEMA(bp); 973 } 974 } /* xlog_iodone */ 975 976 /* 977 * The bdstrat callback function for log bufs. This gives us a central 978 * place to trap bufs in case we get hit by a log I/O error and need to 979 * shutdown. Actually, in practice, even when we didn't get a log error, 980 * we transition the iclogs to IOERROR state *after* flushing all existing 981 * iclogs to disk. This is because we don't want anymore new transactions to be 982 * started or completed afterwards. 983 */ 984 STATIC int 985 xlog_bdstrat_cb(struct xfs_buf *bp) 986 { 987 xlog_in_core_t *iclog; 988 989 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 990 991 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { 992 /* note for irix bstrat will need struct bdevsw passed 993 * Fix the following macro if the code ever is merged 994 */ 995 XFS_bdstrat(bp); 996 return 0; 997 } 998 999 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); 1000 XFS_BUF_ERROR(bp, EIO); 1001 XFS_BUF_STALE(bp); 1002 xfs_biodone(bp); 1003 return XFS_ERROR(EIO); 1004 1005 1006 } 1007 1008 /* 1009 * Return size of each in-core log record buffer. 1010 * 1011 * Low memory machines only get 2 16KB buffers. We don't want to waste 1012 * memory here. However, all other machines get at least 2 32KB buffers. 1013 * The number is hard coded because we don't care about the minimum 1014 * memory size, just 32MB systems. 1015 * 1016 * If the filesystem blocksize is too large, we may need to choose a 1017 * larger size since the directory code currently logs entire blocks. 1018 */ 1019 1020 STATIC void 1021 xlog_get_iclog_buffer_size(xfs_mount_t *mp, 1022 xlog_t *log) 1023 { 1024 int size; 1025 int xhdrs; 1026 1027 if (mp->m_logbufs <= 0) { 1028 if (xfs_physmem <= btoc(128*1024*1024)) { 1029 log->l_iclog_bufs = XLOG_MIN_ICLOGS; 1030 } else if (xfs_physmem <= btoc(400*1024*1024)) { 1031 log->l_iclog_bufs = XLOG_MED_ICLOGS; 1032 } else { /* 256K with 32K bufs */ 1033 log->l_iclog_bufs = XLOG_MAX_ICLOGS; 1034 } 1035 } else { 1036 log->l_iclog_bufs = mp->m_logbufs; 1037 } 1038 1039 /* 1040 * Buffer size passed in from mount system call. 1041 */ 1042 if (mp->m_logbsize > 0) { 1043 size = log->l_iclog_size = mp->m_logbsize; 1044 log->l_iclog_size_log = 0; 1045 while (size != 1) { 1046 log->l_iclog_size_log++; 1047 size >>= 1; 1048 } 1049 1050 if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) { 1051 /* # headers = size / 32K 1052 * one header holds cycles from 32K of data 1053 */ 1054 1055 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; 1056 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) 1057 xhdrs++; 1058 log->l_iclog_hsize = xhdrs << BBSHIFT; 1059 log->l_iclog_heads = xhdrs; 1060 } else { 1061 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); 1062 log->l_iclog_hsize = BBSIZE; 1063 log->l_iclog_heads = 1; 1064 } 1065 goto done; 1066 } 1067 1068 /* 1069 * Special case machines that have less than 32MB of memory. 1070 * All machines with more memory use 32KB buffers. 1071 */ 1072 if (xfs_physmem <= btoc(32*1024*1024)) { 1073 /* Don't change; min configuration */ 1074 log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */ 1075 log->l_iclog_size_log = XLOG_RECORD_BSHIFT; 1076 } else { 1077 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */ 1078 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1079 } 1080 1081 /* the default log size is 16k or 32k which is one header sector */ 1082 log->l_iclog_hsize = BBSIZE; 1083 log->l_iclog_heads = 1; 1084 1085 /* 1086 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use 1087 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers. 1088 */ 1089 if (mp->m_sb.sb_blocksize >= 16*1024) { 1090 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; 1091 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1092 if (mp->m_logbufs <= 0) { 1093 switch (mp->m_sb.sb_blocksize) { 1094 case 16*1024: /* 16 KB */ 1095 log->l_iclog_bufs = 3; 1096 break; 1097 case 32*1024: /* 32 KB */ 1098 log->l_iclog_bufs = 4; 1099 break; 1100 case 64*1024: /* 64 KB */ 1101 log->l_iclog_bufs = 8; 1102 break; 1103 default: 1104 xlog_panic("XFS: Invalid blocksize"); 1105 break; 1106 } 1107 } 1108 } 1109 1110 done: /* are we being asked to make the sizes selected above visible? */ 1111 if (mp->m_logbufs == 0) 1112 mp->m_logbufs = log->l_iclog_bufs; 1113 if (mp->m_logbsize == 0) 1114 mp->m_logbsize = log->l_iclog_size; 1115 } /* xlog_get_iclog_buffer_size */ 1116 1117 1118 /* 1119 * This routine initializes some of the log structure for a given mount point. 1120 * Its primary purpose is to fill in enough, so recovery can occur. However, 1121 * some other stuff may be filled in too. 1122 */ 1123 STATIC xlog_t * 1124 xlog_alloc_log(xfs_mount_t *mp, 1125 xfs_buftarg_t *log_target, 1126 xfs_daddr_t blk_offset, 1127 int num_bblks) 1128 { 1129 xlog_t *log; 1130 xlog_rec_header_t *head; 1131 xlog_in_core_t **iclogp; 1132 xlog_in_core_t *iclog, *prev_iclog=NULL; 1133 xfs_buf_t *bp; 1134 int i; 1135 int iclogsize; 1136 1137 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP); 1138 1139 log->l_mp = mp; 1140 log->l_targ = log_target; 1141 log->l_logsize = BBTOB(num_bblks); 1142 log->l_logBBstart = blk_offset; 1143 log->l_logBBsize = num_bblks; 1144 log->l_covered_state = XLOG_STATE_COVER_IDLE; 1145 log->l_flags |= XLOG_ACTIVE_RECOVERY; 1146 1147 log->l_prev_block = -1; 1148 ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0); 1149 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ 1150 log->l_last_sync_lsn = log->l_tail_lsn; 1151 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ 1152 log->l_grant_reserve_cycle = 1; 1153 log->l_grant_write_cycle = 1; 1154 1155 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) { 1156 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; 1157 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); 1158 /* for larger sector sizes, must have v2 or external log */ 1159 ASSERT(log->l_sectbb_log == 0 || 1160 log->l_logBBstart == 0 || 1161 XFS_SB_VERSION_HASLOGV2(&mp->m_sb)); 1162 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); 1163 } 1164 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; 1165 1166 xlog_get_iclog_buffer_size(mp, log); 1167 1168 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1169 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1170 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1171 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1172 ASSERT(XFS_BUF_ISBUSY(bp)); 1173 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 1174 log->l_xbuf = bp; 1175 1176 spinlock_init(&log->l_icloglock, "iclog"); 1177 spinlock_init(&log->l_grant_lock, "grhead_iclog"); 1178 initnsema(&log->l_flushsema, 0, "ic-flush"); 1179 xlog_state_ticket_alloc(log); /* wait until after icloglock inited */ 1180 1181 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ 1182 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); 1183 1184 iclogp = &log->l_iclog; 1185 /* 1186 * The amount of memory to allocate for the iclog structure is 1187 * rather funky due to the way the structure is defined. It is 1188 * done this way so that we can use different sizes for machines 1189 * with different amounts of memory. See the definition of 1190 * xlog_in_core_t in xfs_log_priv.h for details. 1191 */ 1192 iclogsize = log->l_iclog_size; 1193 ASSERT(log->l_iclog_size >= 4096); 1194 for (i=0; i < log->l_iclog_bufs; i++) { 1195 *iclogp = (xlog_in_core_t *) 1196 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP); 1197 iclog = *iclogp; 1198 iclog->hic_data = (xlog_in_core_2_t *) 1199 kmem_zalloc(iclogsize, KM_SLEEP); 1200 1201 iclog->ic_prev = prev_iclog; 1202 prev_iclog = iclog; 1203 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); 1204 1205 head = &iclog->ic_header; 1206 memset(head, 0, sizeof(xlog_rec_header_t)); 1207 INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); 1208 INT_SET(head->h_version, ARCH_CONVERT, 1209 XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); 1210 INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size); 1211 /* new fields */ 1212 INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT); 1213 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); 1214 1215 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1216 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1217 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1218 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1219 iclog->ic_bp = bp; 1220 1221 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; 1222 iclog->ic_state = XLOG_STATE_ACTIVE; 1223 iclog->ic_log = log; 1224 iclog->ic_callback_tail = &(iclog->ic_callback); 1225 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize; 1226 1227 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); 1228 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); 1229 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force"); 1230 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write"); 1231 1232 iclogp = &iclog->ic_next; 1233 } 1234 *iclogp = log->l_iclog; /* complete ring */ 1235 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ 1236 1237 return log; 1238 } /* xlog_alloc_log */ 1239 1240 1241 /* 1242 * Write out the commit record of a transaction associated with the given 1243 * ticket. Return the lsn of the commit record. 1244 */ 1245 STATIC int 1246 xlog_commit_record(xfs_mount_t *mp, 1247 xlog_ticket_t *ticket, 1248 xlog_in_core_t **iclog, 1249 xfs_lsn_t *commitlsnp) 1250 { 1251 int error; 1252 xfs_log_iovec_t reg[1]; 1253 1254 reg[0].i_addr = NULL; 1255 reg[0].i_len = 0; 1256 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); 1257 1258 ASSERT_ALWAYS(iclog); 1259 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, 1260 iclog, XLOG_COMMIT_TRANS))) { 1261 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 1262 } 1263 return error; 1264 } /* xlog_commit_record */ 1265 1266 1267 /* 1268 * Push on the buffer cache code if we ever use more than 75% of the on-disk 1269 * log space. This code pushes on the lsn which would supposedly free up 1270 * the 25% which we want to leave free. We may need to adopt a policy which 1271 * pushes on an lsn which is further along in the log once we reach the high 1272 * water mark. In this manner, we would be creating a low water mark. 1273 */ 1274 void 1275 xlog_grant_push_ail(xfs_mount_t *mp, 1276 int need_bytes) 1277 { 1278 xlog_t *log = mp->m_log; /* pointer to the log */ 1279 xfs_lsn_t tail_lsn; /* lsn of the log tail */ 1280 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ 1281 int free_blocks; /* free blocks left to write to */ 1282 int free_bytes; /* free bytes left to write to */ 1283 int threshold_block; /* block in lsn we'd like to be at */ 1284 int threshold_cycle; /* lsn cycle we'd like to be at */ 1285 int free_threshold; 1286 SPLDECL(s); 1287 1288 ASSERT(BTOBB(need_bytes) < log->l_logBBsize); 1289 1290 s = GRANT_LOCK(log); 1291 free_bytes = xlog_space_left(log, 1292 log->l_grant_reserve_cycle, 1293 log->l_grant_reserve_bytes); 1294 tail_lsn = log->l_tail_lsn; 1295 free_blocks = BTOBBT(free_bytes); 1296 1297 /* 1298 * Set the threshold for the minimum number of free blocks in the 1299 * log to the maximum of what the caller needs, one quarter of the 1300 * log, and 256 blocks. 1301 */ 1302 free_threshold = BTOBB(need_bytes); 1303 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); 1304 free_threshold = MAX(free_threshold, 256); 1305 if (free_blocks < free_threshold) { 1306 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; 1307 threshold_cycle = CYCLE_LSN(tail_lsn); 1308 if (threshold_block >= log->l_logBBsize) { 1309 threshold_block -= log->l_logBBsize; 1310 threshold_cycle += 1; 1311 } 1312 ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle, 1313 threshold_block); 1314 1315 /* Don't pass in an lsn greater than the lsn of the last 1316 * log record known to be on disk. 1317 */ 1318 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) 1319 threshold_lsn = log->l_last_sync_lsn; 1320 } 1321 GRANT_UNLOCK(log, s); 1322 1323 /* 1324 * Get the transaction layer to kick the dirty buffers out to 1325 * disk asynchronously. No point in trying to do this if 1326 * the filesystem is shutting down. 1327 */ 1328 if (threshold_lsn && 1329 !XLOG_FORCED_SHUTDOWN(log)) 1330 xfs_trans_push_ail(mp, threshold_lsn); 1331 } /* xlog_grant_push_ail */ 1332 1333 1334 /* 1335 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous 1336 * fashion. Previously, we should have moved the current iclog 1337 * ptr in the log to point to the next available iclog. This allows further 1338 * write to continue while this code syncs out an iclog ready to go. 1339 * Before an in-core log can be written out, the data section must be scanned 1340 * to save away the 1st word of each BBSIZE block into the header. We replace 1341 * it with the current cycle count. Each BBSIZE block is tagged with the 1342 * cycle count because there in an implicit assumption that drives will 1343 * guarantee that entire 512 byte blocks get written at once. In other words, 1344 * we can't have part of a 512 byte block written and part not written. By 1345 * tagging each block, we will know which blocks are valid when recovering 1346 * after an unclean shutdown. 1347 * 1348 * This routine is single threaded on the iclog. No other thread can be in 1349 * this routine with the same iclog. Changing contents of iclog can there- 1350 * fore be done without grabbing the state machine lock. Updating the global 1351 * log will require grabbing the lock though. 1352 * 1353 * The entire log manager uses a logical block numbering scheme. Only 1354 * log_sync (and then only bwrite()) know about the fact that the log may 1355 * not start with block zero on a given device. The log block start offset 1356 * is added immediately before calling bwrite(). 1357 */ 1358 1359 int 1360 xlog_sync(xlog_t *log, 1361 xlog_in_core_t *iclog) 1362 { 1363 xfs_caddr_t dptr; /* pointer to byte sized element */ 1364 xfs_buf_t *bp; 1365 int i, ops; 1366 uint count; /* byte count of bwrite */ 1367 uint count_init; /* initial count before roundup */ 1368 int roundoff; /* roundoff to BB or stripe */ 1369 int split = 0; /* split write into two regions */ 1370 int error; 1371 SPLDECL(s); 1372 int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb); 1373 1374 XFS_STATS_INC(xs_log_writes); 1375 ASSERT(iclog->ic_refcnt == 0); 1376 1377 /* Add for LR header */ 1378 count_init = log->l_iclog_hsize + iclog->ic_offset; 1379 1380 /* Round out the log write size */ 1381 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { 1382 /* we have a v2 stripe unit to use */ 1383 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); 1384 } else { 1385 count = BBTOB(BTOBB(count_init)); 1386 } 1387 roundoff = count - count_init; 1388 ASSERT(roundoff >= 0); 1389 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && 1390 roundoff < log->l_mp->m_sb.sb_logsunit) 1391 || 1392 (log->l_mp->m_sb.sb_logsunit <= 1 && 1393 roundoff < BBTOB(1))); 1394 1395 /* move grant heads by roundoff in sync */ 1396 s = GRANT_LOCK(log); 1397 xlog_grant_add_space(log, roundoff); 1398 GRANT_UNLOCK(log, s); 1399 1400 /* put cycle number in every block */ 1401 xlog_pack_data(log, iclog, roundoff); 1402 1403 /* real byte length */ 1404 if (v2) { 1405 INT_SET(iclog->ic_header.h_len, 1406 ARCH_CONVERT, 1407 iclog->ic_offset + roundoff); 1408 } else { 1409 INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset); 1410 } 1411 1412 /* put ops count in correct order */ 1413 ops = iclog->ic_header.h_num_logops; 1414 INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops); 1415 1416 bp = iclog->ic_bp; 1417 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); 1418 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1419 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT))); 1420 1421 XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); 1422 1423 /* Do we need to split this write into 2 parts? */ 1424 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { 1425 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); 1426 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); 1427 iclog->ic_bwritecnt = 2; /* split into 2 writes */ 1428 } else { 1429 iclog->ic_bwritecnt = 1; 1430 } 1431 XFS_BUF_SET_PTR(bp, (xfs_caddr_t) &(iclog->ic_header), count); 1432 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ 1433 XFS_BUF_ZEROFLAGS(bp); 1434 XFS_BUF_BUSY(bp); 1435 XFS_BUF_ASYNC(bp); 1436 /* 1437 * Do an ordered write for the log block. 1438 * Its unnecessary to flush the first split block in the log wrap case. 1439 */ 1440 if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) 1441 XFS_BUF_ORDERED(bp); 1442 1443 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1444 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1445 1446 xlog_verify_iclog(log, iclog, count, B_TRUE); 1447 1448 /* account for log which doesn't start at block #0 */ 1449 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1450 /* 1451 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem 1452 * is shutting down. 1453 */ 1454 XFS_BUF_WRITE(bp); 1455 1456 if ((error = XFS_bwrite(bp))) { 1457 xfs_ioerror_alert("xlog_sync", log->l_mp, bp, 1458 XFS_BUF_ADDR(bp)); 1459 return error; 1460 } 1461 if (split) { 1462 bp = iclog->ic_log->l_xbuf; 1463 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == 1464 (unsigned long)1); 1465 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1466 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ 1467 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ 1468 (__psint_t)count), split); 1469 XFS_BUF_SET_FSPRIVATE(bp, iclog); 1470 XFS_BUF_ZEROFLAGS(bp); 1471 XFS_BUF_BUSY(bp); 1472 XFS_BUF_ASYNC(bp); 1473 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) 1474 XFS_BUF_ORDERED(bp); 1475 dptr = XFS_BUF_PTR(bp); 1476 /* 1477 * Bump the cycle numbers at the start of each block 1478 * since this part of the buffer is at the start of 1479 * a new cycle. Watch out for the header magic number 1480 * case, though. 1481 */ 1482 for (i=0; i<split; i += BBSIZE) { 1483 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1484 if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 1485 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1486 dptr += BBSIZE; 1487 } 1488 1489 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1490 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1491 1492 /* account for internal log which doesn't start at block #0 */ 1493 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1494 XFS_BUF_WRITE(bp); 1495 if ((error = XFS_bwrite(bp))) { 1496 xfs_ioerror_alert("xlog_sync (split)", log->l_mp, 1497 bp, XFS_BUF_ADDR(bp)); 1498 return error; 1499 } 1500 } 1501 return 0; 1502 } /* xlog_sync */ 1503 1504 1505 /* 1506 * Deallocate a log structure 1507 */ 1508 void 1509 xlog_dealloc_log(xlog_t *log) 1510 { 1511 xlog_in_core_t *iclog, *next_iclog; 1512 xlog_ticket_t *tic, *next_tic; 1513 int i; 1514 1515 1516 iclog = log->l_iclog; 1517 for (i=0; i<log->l_iclog_bufs; i++) { 1518 sv_destroy(&iclog->ic_forcesema); 1519 sv_destroy(&iclog->ic_writesema); 1520 xfs_buf_free(iclog->ic_bp); 1521 #ifdef XFS_LOG_TRACE 1522 if (iclog->ic_trace != NULL) { 1523 ktrace_free(iclog->ic_trace); 1524 } 1525 #endif 1526 next_iclog = iclog->ic_next; 1527 kmem_free(iclog->hic_data, log->l_iclog_size); 1528 kmem_free(iclog, sizeof(xlog_in_core_t)); 1529 iclog = next_iclog; 1530 } 1531 freesema(&log->l_flushsema); 1532 spinlock_destroy(&log->l_icloglock); 1533 spinlock_destroy(&log->l_grant_lock); 1534 1535 /* XXXsup take a look at this again. */ 1536 if ((log->l_ticket_cnt != log->l_ticket_tcnt) && 1537 !XLOG_FORCED_SHUTDOWN(log)) { 1538 xfs_fs_cmn_err(CE_WARN, log->l_mp, 1539 "xlog_dealloc_log: (cnt: %d, total: %d)", 1540 log->l_ticket_cnt, log->l_ticket_tcnt); 1541 /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */ 1542 1543 } else { 1544 tic = log->l_unmount_free; 1545 while (tic) { 1546 next_tic = tic->t_next; 1547 kmem_free(tic, NBPP); 1548 tic = next_tic; 1549 } 1550 } 1551 xfs_buf_free(log->l_xbuf); 1552 #ifdef XFS_LOG_TRACE 1553 if (log->l_trace != NULL) { 1554 ktrace_free(log->l_trace); 1555 } 1556 if (log->l_grant_trace != NULL) { 1557 ktrace_free(log->l_grant_trace); 1558 } 1559 #endif 1560 log->l_mp->m_log = NULL; 1561 kmem_free(log, sizeof(xlog_t)); 1562 } /* xlog_dealloc_log */ 1563 1564 /* 1565 * Update counters atomically now that memcpy is done. 1566 */ 1567 /* ARGSUSED */ 1568 static inline void 1569 xlog_state_finish_copy(xlog_t *log, 1570 xlog_in_core_t *iclog, 1571 int record_cnt, 1572 int copy_bytes) 1573 { 1574 SPLDECL(s); 1575 1576 s = LOG_LOCK(log); 1577 1578 iclog->ic_header.h_num_logops += record_cnt; 1579 iclog->ic_offset += copy_bytes; 1580 1581 LOG_UNLOCK(log, s); 1582 } /* xlog_state_finish_copy */ 1583 1584 1585 1586 1587 /* 1588 * print out info relating to regions written which consume 1589 * the reservation 1590 */ 1591 STATIC void 1592 xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) 1593 { 1594 uint i; 1595 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); 1596 1597 /* match with XLOG_REG_TYPE_* in xfs_log.h */ 1598 static char *res_type_str[XLOG_REG_TYPE_MAX] = { 1599 "bformat", 1600 "bchunk", 1601 "efi_format", 1602 "efd_format", 1603 "iformat", 1604 "icore", 1605 "iext", 1606 "ibroot", 1607 "ilocal", 1608 "iattr_ext", 1609 "iattr_broot", 1610 "iattr_local", 1611 "qformat", 1612 "dquot", 1613 "quotaoff", 1614 "LR header", 1615 "unmount", 1616 "commit", 1617 "trans header" 1618 }; 1619 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { 1620 "SETATTR_NOT_SIZE", 1621 "SETATTR_SIZE", 1622 "INACTIVE", 1623 "CREATE", 1624 "CREATE_TRUNC", 1625 "TRUNCATE_FILE", 1626 "REMOVE", 1627 "LINK", 1628 "RENAME", 1629 "MKDIR", 1630 "RMDIR", 1631 "SYMLINK", 1632 "SET_DMATTRS", 1633 "GROWFS", 1634 "STRAT_WRITE", 1635 "DIOSTRAT", 1636 "WRITE_SYNC", 1637 "WRITEID", 1638 "ADDAFORK", 1639 "ATTRINVAL", 1640 "ATRUNCATE", 1641 "ATTR_SET", 1642 "ATTR_RM", 1643 "ATTR_FLAG", 1644 "CLEAR_AGI_BUCKET", 1645 "QM_SBCHANGE", 1646 "DUMMY1", 1647 "DUMMY2", 1648 "QM_QUOTAOFF", 1649 "QM_DQALLOC", 1650 "QM_SETQLIM", 1651 "QM_DQCLUSTER", 1652 "QM_QINOCREATE", 1653 "QM_QUOTAOFF_END", 1654 "SB_UNIT", 1655 "FSYNC_TS", 1656 "GROWFSRT_ALLOC", 1657 "GROWFSRT_ZERO", 1658 "GROWFSRT_FREE", 1659 "SWAPEXT" 1660 }; 1661 1662 xfs_fs_cmn_err(CE_WARN, mp, 1663 "xfs_log_write: reservation summary:\n" 1664 " trans type = %s (%u)\n" 1665 " unit res = %d bytes\n" 1666 " current res = %d bytes\n" 1667 " total reg = %u bytes (o/flow = %u bytes)\n" 1668 " ophdrs = %u (ophdr space = %u bytes)\n" 1669 " ophdr + reg = %u bytes\n" 1670 " num regions = %u\n", 1671 ((ticket->t_trans_type <= 0 || 1672 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? 1673 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), 1674 ticket->t_trans_type, 1675 ticket->t_unit_res, 1676 ticket->t_curr_res, 1677 ticket->t_res_arr_sum, ticket->t_res_o_flow, 1678 ticket->t_res_num_ophdrs, ophdr_spc, 1679 ticket->t_res_arr_sum + 1680 ticket->t_res_o_flow + ophdr_spc, 1681 ticket->t_res_num); 1682 1683 for (i = 0; i < ticket->t_res_num; i++) { 1684 uint r_type = ticket->t_res_arr[i].r_type; 1685 cmn_err(CE_WARN, 1686 "region[%u]: %s - %u bytes\n", 1687 i, 1688 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? 1689 "bad-rtype" : res_type_str[r_type-1]), 1690 ticket->t_res_arr[i].r_len); 1691 } 1692 } 1693 1694 /* 1695 * Write some region out to in-core log 1696 * 1697 * This will be called when writing externally provided regions or when 1698 * writing out a commit record for a given transaction. 1699 * 1700 * General algorithm: 1701 * 1. Find total length of this write. This may include adding to the 1702 * lengths passed in. 1703 * 2. Check whether we violate the tickets reservation. 1704 * 3. While writing to this iclog 1705 * A. Reserve as much space in this iclog as can get 1706 * B. If this is first write, save away start lsn 1707 * C. While writing this region: 1708 * 1. If first write of transaction, write start record 1709 * 2. Write log operation header (header per region) 1710 * 3. Find out if we can fit entire region into this iclog 1711 * 4. Potentially, verify destination memcpy ptr 1712 * 5. Memcpy (partial) region 1713 * 6. If partial copy, release iclog; otherwise, continue 1714 * copying more regions into current iclog 1715 * 4. Mark want sync bit (in simulation mode) 1716 * 5. Release iclog for potential flush to on-disk log. 1717 * 1718 * ERRORS: 1719 * 1. Panic if reservation is overrun. This should never happen since 1720 * reservation amounts are generated internal to the filesystem. 1721 * NOTES: 1722 * 1. Tickets are single threaded data structures. 1723 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the 1724 * syncing routine. When a single log_write region needs to span 1725 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set 1726 * on all log operation writes which don't contain the end of the 1727 * region. The XLOG_END_TRANS bit is used for the in-core log 1728 * operation which contains the end of the continued log_write region. 1729 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, 1730 * we don't really know exactly how much space will be used. As a result, 1731 * we don't update ic_offset until the end when we know exactly how many 1732 * bytes have been written out. 1733 */ 1734 int 1735 xlog_write(xfs_mount_t * mp, 1736 xfs_log_iovec_t reg[], 1737 int nentries, 1738 xfs_log_ticket_t tic, 1739 xfs_lsn_t *start_lsn, 1740 xlog_in_core_t **commit_iclog, 1741 uint flags) 1742 { 1743 xlog_t *log = mp->m_log; 1744 xlog_ticket_t *ticket = (xlog_ticket_t *)tic; 1745 xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ 1746 xlog_op_header_t *logop_head; /* ptr to log operation header */ 1747 __psint_t ptr; /* copy address into data region */ 1748 int len; /* # xlog_write() bytes 2 still copy */ 1749 int index; /* region index currently copying */ 1750 int log_offset; /* offset (from 0) into data region */ 1751 int start_rec_copy; /* # bytes to copy for start record */ 1752 int partial_copy; /* did we split a region? */ 1753 int partial_copy_len;/* # bytes copied if split region */ 1754 int need_copy; /* # bytes need to memcpy this region */ 1755 int copy_len; /* # bytes actually memcpy'ing */ 1756 int copy_off; /* # bytes from entry start */ 1757 int contwr; /* continued write of in-core log? */ 1758 int error; 1759 int record_cnt = 0, data_cnt = 0; 1760 1761 partial_copy_len = partial_copy = 0; 1762 1763 /* Calculate potential maximum space. Each region gets its own 1764 * xlog_op_header_t and may need to be double word aligned. 1765 */ 1766 len = 0; 1767 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ 1768 len += sizeof(xlog_op_header_t); 1769 XLOG_TIC_ADD_OPHDR(ticket); 1770 } 1771 1772 for (index = 0; index < nentries; index++) { 1773 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ 1774 XLOG_TIC_ADD_OPHDR(ticket); 1775 len += reg[index].i_len; 1776 XLOG_TIC_ADD_REGION(ticket, reg[index].i_len, reg[index].i_type); 1777 } 1778 contwr = *start_lsn = 0; 1779 1780 if (ticket->t_curr_res < len) { 1781 xlog_print_tic_res(mp, ticket); 1782 #ifdef DEBUG 1783 xlog_panic( 1784 "xfs_log_write: reservation ran out. Need to up reservation"); 1785 #else 1786 /* Customer configurable panic */ 1787 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, 1788 "xfs_log_write: reservation ran out. Need to up reservation"); 1789 /* If we did not panic, shutdown the filesystem */ 1790 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1791 #endif 1792 } else 1793 ticket->t_curr_res -= len; 1794 1795 for (index = 0; index < nentries; ) { 1796 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, 1797 &contwr, &log_offset))) 1798 return error; 1799 1800 ASSERT(log_offset <= iclog->ic_size - 1); 1801 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); 1802 1803 /* start_lsn is the first lsn written to. That's all we need. */ 1804 if (! *start_lsn) 1805 *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 1806 1807 /* This loop writes out as many regions as can fit in the amount 1808 * of space which was allocated by xlog_state_get_iclog_space(). 1809 */ 1810 while (index < nentries) { 1811 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); 1812 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); 1813 start_rec_copy = 0; 1814 1815 /* If first write for transaction, insert start record. 1816 * We can't be trying to commit if we are inited. We can't 1817 * have any "partial_copy" if we are inited. 1818 */ 1819 if (ticket->t_flags & XLOG_TIC_INITED) { 1820 logop_head = (xlog_op_header_t *)ptr; 1821 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1822 logop_head->oh_clientid = ticket->t_clientid; 1823 logop_head->oh_len = 0; 1824 logop_head->oh_flags = XLOG_START_TRANS; 1825 logop_head->oh_res2 = 0; 1826 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ 1827 record_cnt++; 1828 1829 start_rec_copy = sizeof(xlog_op_header_t); 1830 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); 1831 } 1832 1833 /* Copy log operation header directly into data section */ 1834 logop_head = (xlog_op_header_t *)ptr; 1835 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1836 logop_head->oh_clientid = ticket->t_clientid; 1837 logop_head->oh_res2 = 0; 1838 1839 /* header copied directly */ 1840 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); 1841 1842 /* are we copying a commit or unmount record? */ 1843 logop_head->oh_flags = flags; 1844 1845 /* 1846 * We've seen logs corrupted with bad transaction client 1847 * ids. This makes sure that XFS doesn't generate them on. 1848 * Turn this into an EIO and shut down the filesystem. 1849 */ 1850 switch (logop_head->oh_clientid) { 1851 case XFS_TRANSACTION: 1852 case XFS_VOLUME: 1853 case XFS_LOG: 1854 break; 1855 default: 1856 xfs_fs_cmn_err(CE_WARN, mp, 1857 "Bad XFS transaction clientid 0x%x in ticket 0x%p", 1858 logop_head->oh_clientid, tic); 1859 return XFS_ERROR(EIO); 1860 } 1861 1862 /* Partial write last time? => (partial_copy != 0) 1863 * need_copy is the amount we'd like to copy if everything could 1864 * fit in the current memcpy. 1865 */ 1866 need_copy = reg[index].i_len - partial_copy_len; 1867 1868 copy_off = partial_copy_len; 1869 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ 1870 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy); 1871 if (partial_copy) 1872 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); 1873 partial_copy_len = partial_copy = 0; 1874 } else { /* partial write */ 1875 copy_len = iclog->ic_size - log_offset; 1876 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len); 1877 logop_head->oh_flags |= XLOG_CONTINUE_TRANS; 1878 if (partial_copy) 1879 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; 1880 partial_copy_len += copy_len; 1881 partial_copy++; 1882 len += sizeof(xlog_op_header_t); /* from splitting of region */ 1883 /* account for new log op header */ 1884 ticket->t_curr_res -= sizeof(xlog_op_header_t); 1885 XLOG_TIC_ADD_OPHDR(ticket); 1886 } 1887 xlog_verify_dest_ptr(log, ptr); 1888 1889 /* copy region */ 1890 ASSERT(copy_len >= 0); 1891 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); 1892 xlog_write_adv_cnt(ptr, len, log_offset, copy_len); 1893 1894 /* make copy_len total bytes copied, including headers */ 1895 copy_len += start_rec_copy + sizeof(xlog_op_header_t); 1896 record_cnt++; 1897 data_cnt += contwr ? copy_len : 0; 1898 if (partial_copy) { /* copied partial region */ 1899 /* already marked WANT_SYNC by xlog_state_get_iclog_space */ 1900 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1901 record_cnt = data_cnt = 0; 1902 if ((error = xlog_state_release_iclog(log, iclog))) 1903 return error; 1904 break; /* don't increment index */ 1905 } else { /* copied entire region */ 1906 index++; 1907 partial_copy_len = partial_copy = 0; 1908 1909 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { 1910 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1911 record_cnt = data_cnt = 0; 1912 xlog_state_want_sync(log, iclog); 1913 if (commit_iclog) { 1914 ASSERT(flags & XLOG_COMMIT_TRANS); 1915 *commit_iclog = iclog; 1916 } else if ((error = xlog_state_release_iclog(log, iclog))) 1917 return error; 1918 if (index == nentries) 1919 return 0; /* we are done */ 1920 else 1921 break; 1922 } 1923 } /* if (partial_copy) */ 1924 } /* while (index < nentries) */ 1925 } /* for (index = 0; index < nentries; ) */ 1926 ASSERT(len == 0); 1927 1928 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1929 if (commit_iclog) { 1930 ASSERT(flags & XLOG_COMMIT_TRANS); 1931 *commit_iclog = iclog; 1932 return 0; 1933 } 1934 return xlog_state_release_iclog(log, iclog); 1935 } /* xlog_write */ 1936 1937 1938 /***************************************************************************** 1939 * 1940 * State Machine functions 1941 * 1942 ***************************************************************************** 1943 */ 1944 1945 /* Clean iclogs starting from the head. This ordering must be 1946 * maintained, so an iclog doesn't become ACTIVE beyond one that 1947 * is SYNCING. This is also required to maintain the notion that we use 1948 * a counting semaphore to hold off would be writers to the log when every 1949 * iclog is trying to sync to disk. 1950 * 1951 * State Change: DIRTY -> ACTIVE 1952 */ 1953 STATIC void 1954 xlog_state_clean_log(xlog_t *log) 1955 { 1956 xlog_in_core_t *iclog; 1957 int changed = 0; 1958 1959 iclog = log->l_iclog; 1960 do { 1961 if (iclog->ic_state == XLOG_STATE_DIRTY) { 1962 iclog->ic_state = XLOG_STATE_ACTIVE; 1963 iclog->ic_offset = 0; 1964 iclog->ic_callback = NULL; /* don't need to free */ 1965 /* 1966 * If the number of ops in this iclog indicate it just 1967 * contains the dummy transaction, we can 1968 * change state into IDLE (the second time around). 1969 * Otherwise we should change the state into 1970 * NEED a dummy. 1971 * We don't need to cover the dummy. 1972 */ 1973 if (!changed && 1974 (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) { 1975 changed = 1; 1976 } else { 1977 /* 1978 * We have two dirty iclogs so start over 1979 * This could also be num of ops indicates 1980 * this is not the dummy going out. 1981 */ 1982 changed = 2; 1983 } 1984 iclog->ic_header.h_num_logops = 0; 1985 memset(iclog->ic_header.h_cycle_data, 0, 1986 sizeof(iclog->ic_header.h_cycle_data)); 1987 iclog->ic_header.h_lsn = 0; 1988 } else if (iclog->ic_state == XLOG_STATE_ACTIVE) 1989 /* do nothing */; 1990 else 1991 break; /* stop cleaning */ 1992 iclog = iclog->ic_next; 1993 } while (iclog != log->l_iclog); 1994 1995 /* log is locked when we are called */ 1996 /* 1997 * Change state for the dummy log recording. 1998 * We usually go to NEED. But we go to NEED2 if the changed indicates 1999 * we are done writing the dummy record. 2000 * If we are done with the second dummy recored (DONE2), then 2001 * we go to IDLE. 2002 */ 2003 if (changed) { 2004 switch (log->l_covered_state) { 2005 case XLOG_STATE_COVER_IDLE: 2006 case XLOG_STATE_COVER_NEED: 2007 case XLOG_STATE_COVER_NEED2: 2008 log->l_covered_state = XLOG_STATE_COVER_NEED; 2009 break; 2010 2011 case XLOG_STATE_COVER_DONE: 2012 if (changed == 1) 2013 log->l_covered_state = XLOG_STATE_COVER_NEED2; 2014 else 2015 log->l_covered_state = XLOG_STATE_COVER_NEED; 2016 break; 2017 2018 case XLOG_STATE_COVER_DONE2: 2019 if (changed == 1) 2020 log->l_covered_state = XLOG_STATE_COVER_IDLE; 2021 else 2022 log->l_covered_state = XLOG_STATE_COVER_NEED; 2023 break; 2024 2025 default: 2026 ASSERT(0); 2027 } 2028 } 2029 } /* xlog_state_clean_log */ 2030 2031 STATIC xfs_lsn_t 2032 xlog_get_lowest_lsn( 2033 xlog_t *log) 2034 { 2035 xlog_in_core_t *lsn_log; 2036 xfs_lsn_t lowest_lsn, lsn; 2037 2038 lsn_log = log->l_iclog; 2039 lowest_lsn = 0; 2040 do { 2041 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { 2042 lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT); 2043 if ((lsn && !lowest_lsn) || 2044 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { 2045 lowest_lsn = lsn; 2046 } 2047 } 2048 lsn_log = lsn_log->ic_next; 2049 } while (lsn_log != log->l_iclog); 2050 return lowest_lsn; 2051 } 2052 2053 2054 STATIC void 2055 xlog_state_do_callback( 2056 xlog_t *log, 2057 int aborted, 2058 xlog_in_core_t *ciclog) 2059 { 2060 xlog_in_core_t *iclog; 2061 xlog_in_core_t *first_iclog; /* used to know when we've 2062 * processed all iclogs once */ 2063 xfs_log_callback_t *cb, *cb_next; 2064 int flushcnt = 0; 2065 xfs_lsn_t lowest_lsn; 2066 int ioerrors; /* counter: iclogs with errors */ 2067 int loopdidcallbacks; /* flag: inner loop did callbacks*/ 2068 int funcdidcallbacks; /* flag: function did callbacks */ 2069 int repeats; /* for issuing console warnings if 2070 * looping too many times */ 2071 SPLDECL(s); 2072 2073 s = LOG_LOCK(log); 2074 first_iclog = iclog = log->l_iclog; 2075 ioerrors = 0; 2076 funcdidcallbacks = 0; 2077 repeats = 0; 2078 2079 do { 2080 /* 2081 * Scan all iclogs starting with the one pointed to by the 2082 * log. Reset this starting point each time the log is 2083 * unlocked (during callbacks). 2084 * 2085 * Keep looping through iclogs until one full pass is made 2086 * without running any callbacks. 2087 */ 2088 first_iclog = log->l_iclog; 2089 iclog = log->l_iclog; 2090 loopdidcallbacks = 0; 2091 repeats++; 2092 2093 do { 2094 2095 /* skip all iclogs in the ACTIVE & DIRTY states */ 2096 if (iclog->ic_state & 2097 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { 2098 iclog = iclog->ic_next; 2099 continue; 2100 } 2101 2102 /* 2103 * Between marking a filesystem SHUTDOWN and stopping 2104 * the log, we do flush all iclogs to disk (if there 2105 * wasn't a log I/O error). So, we do want things to 2106 * go smoothly in case of just a SHUTDOWN w/o a 2107 * LOG_IO_ERROR. 2108 */ 2109 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 2110 /* 2111 * Can only perform callbacks in order. Since 2112 * this iclog is not in the DONE_SYNC/ 2113 * DO_CALLBACK state, we skip the rest and 2114 * just try to clean up. If we set our iclog 2115 * to DO_CALLBACK, we will not process it when 2116 * we retry since a previous iclog is in the 2117 * CALLBACK and the state cannot change since 2118 * we are holding the LOG_LOCK. 2119 */ 2120 if (!(iclog->ic_state & 2121 (XLOG_STATE_DONE_SYNC | 2122 XLOG_STATE_DO_CALLBACK))) { 2123 if (ciclog && (ciclog->ic_state == 2124 XLOG_STATE_DONE_SYNC)) { 2125 ciclog->ic_state = XLOG_STATE_DO_CALLBACK; 2126 } 2127 break; 2128 } 2129 /* 2130 * We now have an iclog that is in either the 2131 * DO_CALLBACK or DONE_SYNC states. The other 2132 * states (WANT_SYNC, SYNCING, or CALLBACK were 2133 * caught by the above if and are going to 2134 * clean (i.e. we aren't doing their callbacks) 2135 * see the above if. 2136 */ 2137 2138 /* 2139 * We will do one more check here to see if we 2140 * have chased our tail around. 2141 */ 2142 2143 lowest_lsn = xlog_get_lowest_lsn(log); 2144 if (lowest_lsn && ( 2145 XFS_LSN_CMP( 2146 lowest_lsn, 2147 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2148 )<0)) { 2149 iclog = iclog->ic_next; 2150 continue; /* Leave this iclog for 2151 * another thread */ 2152 } 2153 2154 iclog->ic_state = XLOG_STATE_CALLBACK; 2155 2156 LOG_UNLOCK(log, s); 2157 2158 /* l_last_sync_lsn field protected by 2159 * GRANT_LOCK. Don't worry about iclog's lsn. 2160 * No one else can be here except us. 2161 */ 2162 s = GRANT_LOCK(log); 2163 ASSERT(XFS_LSN_CMP( 2164 log->l_last_sync_lsn, 2165 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2166 )<=0); 2167 log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2168 GRANT_UNLOCK(log, s); 2169 2170 /* 2171 * Keep processing entries in the callback list 2172 * until we come around and it is empty. We 2173 * need to atomically see that the list is 2174 * empty and change the state to DIRTY so that 2175 * we don't miss any more callbacks being added. 2176 */ 2177 s = LOG_LOCK(log); 2178 } else { 2179 ioerrors++; 2180 } 2181 cb = iclog->ic_callback; 2182 2183 while (cb != 0) { 2184 iclog->ic_callback_tail = &(iclog->ic_callback); 2185 iclog->ic_callback = NULL; 2186 LOG_UNLOCK(log, s); 2187 2188 /* perform callbacks in the order given */ 2189 for (; cb != 0; cb = cb_next) { 2190 cb_next = cb->cb_next; 2191 cb->cb_func(cb->cb_arg, aborted); 2192 } 2193 s = LOG_LOCK(log); 2194 cb = iclog->ic_callback; 2195 } 2196 2197 loopdidcallbacks++; 2198 funcdidcallbacks++; 2199 2200 ASSERT(iclog->ic_callback == 0); 2201 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) 2202 iclog->ic_state = XLOG_STATE_DIRTY; 2203 2204 /* 2205 * Transition from DIRTY to ACTIVE if applicable. 2206 * NOP if STATE_IOERROR. 2207 */ 2208 xlog_state_clean_log(log); 2209 2210 /* wake up threads waiting in xfs_log_force() */ 2211 sv_broadcast(&iclog->ic_forcesema); 2212 2213 iclog = iclog->ic_next; 2214 } while (first_iclog != iclog); 2215 if (repeats && (repeats % 10) == 0) { 2216 xfs_fs_cmn_err(CE_WARN, log->l_mp, 2217 "xlog_state_do_callback: looping %d", repeats); 2218 } 2219 } while (!ioerrors && loopdidcallbacks); 2220 2221 /* 2222 * make one last gasp attempt to see if iclogs are being left in 2223 * limbo.. 2224 */ 2225 #ifdef DEBUG 2226 if (funcdidcallbacks) { 2227 first_iclog = iclog = log->l_iclog; 2228 do { 2229 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); 2230 /* 2231 * Terminate the loop if iclogs are found in states 2232 * which will cause other threads to clean up iclogs. 2233 * 2234 * SYNCING - i/o completion will go through logs 2235 * DONE_SYNC - interrupt thread should be waiting for 2236 * LOG_LOCK 2237 * IOERROR - give up hope all ye who enter here 2238 */ 2239 if (iclog->ic_state == XLOG_STATE_WANT_SYNC || 2240 iclog->ic_state == XLOG_STATE_SYNCING || 2241 iclog->ic_state == XLOG_STATE_DONE_SYNC || 2242 iclog->ic_state == XLOG_STATE_IOERROR ) 2243 break; 2244 iclog = iclog->ic_next; 2245 } while (first_iclog != iclog); 2246 } 2247 #endif 2248 2249 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { 2250 flushcnt = log->l_flushcnt; 2251 log->l_flushcnt = 0; 2252 } 2253 LOG_UNLOCK(log, s); 2254 while (flushcnt--) 2255 vsema(&log->l_flushsema); 2256 } /* xlog_state_do_callback */ 2257 2258 2259 /* 2260 * Finish transitioning this iclog to the dirty state. 2261 * 2262 * Make sure that we completely execute this routine only when this is 2263 * the last call to the iclog. There is a good chance that iclog flushes, 2264 * when we reach the end of the physical log, get turned into 2 separate 2265 * calls to bwrite. Hence, one iclog flush could generate two calls to this 2266 * routine. By using the reference count bwritecnt, we guarantee that only 2267 * the second completion goes through. 2268 * 2269 * Callbacks could take time, so they are done outside the scope of the 2270 * global state machine log lock. Assume that the calls to cvsema won't 2271 * take a long time. At least we know it won't sleep. 2272 */ 2273 void 2274 xlog_state_done_syncing( 2275 xlog_in_core_t *iclog, 2276 int aborted) 2277 { 2278 xlog_t *log = iclog->ic_log; 2279 SPLDECL(s); 2280 2281 s = LOG_LOCK(log); 2282 2283 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || 2284 iclog->ic_state == XLOG_STATE_IOERROR); 2285 ASSERT(iclog->ic_refcnt == 0); 2286 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); 2287 2288 2289 /* 2290 * If we got an error, either on the first buffer, or in the case of 2291 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, 2292 * and none should ever be attempted to be written to disk 2293 * again. 2294 */ 2295 if (iclog->ic_state != XLOG_STATE_IOERROR) { 2296 if (--iclog->ic_bwritecnt == 1) { 2297 LOG_UNLOCK(log, s); 2298 return; 2299 } 2300 iclog->ic_state = XLOG_STATE_DONE_SYNC; 2301 } 2302 2303 /* 2304 * Someone could be sleeping prior to writing out the next 2305 * iclog buffer, we wake them all, one will get to do the 2306 * I/O, the others get to wait for the result. 2307 */ 2308 sv_broadcast(&iclog->ic_writesema); 2309 LOG_UNLOCK(log, s); 2310 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ 2311 } /* xlog_state_done_syncing */ 2312 2313 2314 /* 2315 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must 2316 * sleep. The flush semaphore is set to the number of in-core buffers and 2317 * decremented around disk syncing. Therefore, if all buffers are syncing, 2318 * this semaphore will cause new writes to sleep until a sync completes. 2319 * Otherwise, this code just does p() followed by v(). This approximates 2320 * a sleep/wakeup except we can't race. 2321 * 2322 * The in-core logs are used in a circular fashion. They are not used 2323 * out-of-order even when an iclog past the head is free. 2324 * 2325 * return: 2326 * * log_offset where xlog_write() can start writing into the in-core 2327 * log's data space. 2328 * * in-core log pointer to which xlog_write() should write. 2329 * * boolean indicating this is a continued write to an in-core log. 2330 * If this is the last write, then the in-core log's offset field 2331 * needs to be incremented, depending on the amount of data which 2332 * is copied. 2333 */ 2334 int 2335 xlog_state_get_iclog_space(xlog_t *log, 2336 int len, 2337 xlog_in_core_t **iclogp, 2338 xlog_ticket_t *ticket, 2339 int *continued_write, 2340 int *logoffsetp) 2341 { 2342 SPLDECL(s); 2343 int log_offset; 2344 xlog_rec_header_t *head; 2345 xlog_in_core_t *iclog; 2346 int error; 2347 2348 restart: 2349 s = LOG_LOCK(log); 2350 if (XLOG_FORCED_SHUTDOWN(log)) { 2351 LOG_UNLOCK(log, s); 2352 return XFS_ERROR(EIO); 2353 } 2354 2355 iclog = log->l_iclog; 2356 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { 2357 log->l_flushcnt++; 2358 LOG_UNLOCK(log, s); 2359 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); 2360 XFS_STATS_INC(xs_log_noiclogs); 2361 /* Ensure that log writes happen */ 2362 psema(&log->l_flushsema, PINOD); 2363 goto restart; 2364 } 2365 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2366 head = &iclog->ic_header; 2367 2368 iclog->ic_refcnt++; /* prevents sync */ 2369 log_offset = iclog->ic_offset; 2370 2371 /* On the 1st write to an iclog, figure out lsn. This works 2372 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are 2373 * committing to. If the offset is set, that's how many blocks 2374 * must be written. 2375 */ 2376 if (log_offset == 0) { 2377 ticket->t_curr_res -= log->l_iclog_hsize; 2378 XLOG_TIC_ADD_REGION(ticket, 2379 log->l_iclog_hsize, 2380 XLOG_REG_TYPE_LRHEADER); 2381 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle); 2382 ASSIGN_LSN(head->h_lsn, log); 2383 ASSERT(log->l_curr_block >= 0); 2384 } 2385 2386 /* If there is enough room to write everything, then do it. Otherwise, 2387 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC 2388 * bit is on, so this will get flushed out. Don't update ic_offset 2389 * until you know exactly how many bytes get copied. Therefore, wait 2390 * until later to update ic_offset. 2391 * 2392 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's 2393 * can fit into remaining data section. 2394 */ 2395 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { 2396 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2397 2398 /* If I'm the only one writing to this iclog, sync it to disk */ 2399 if (iclog->ic_refcnt == 1) { 2400 LOG_UNLOCK(log, s); 2401 if ((error = xlog_state_release_iclog(log, iclog))) 2402 return error; 2403 } else { 2404 iclog->ic_refcnt--; 2405 LOG_UNLOCK(log, s); 2406 } 2407 goto restart; 2408 } 2409 2410 /* Do we have enough room to write the full amount in the remainder 2411 * of this iclog? Or must we continue a write on the next iclog and 2412 * mark this iclog as completely taken? In the case where we switch 2413 * iclogs (to mark it taken), this particular iclog will release/sync 2414 * to disk in xlog_write(). 2415 */ 2416 if (len <= iclog->ic_size - iclog->ic_offset) { 2417 *continued_write = 0; 2418 iclog->ic_offset += len; 2419 } else { 2420 *continued_write = 1; 2421 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2422 } 2423 *iclogp = iclog; 2424 2425 ASSERT(iclog->ic_offset <= iclog->ic_size); 2426 LOG_UNLOCK(log, s); 2427 2428 *logoffsetp = log_offset; 2429 return 0; 2430 } /* xlog_state_get_iclog_space */ 2431 2432 /* 2433 * Atomically get the log space required for a log ticket. 2434 * 2435 * Once a ticket gets put onto the reserveq, it will only return after 2436 * the needed reservation is satisfied. 2437 */ 2438 STATIC int 2439 xlog_grant_log_space(xlog_t *log, 2440 xlog_ticket_t *tic) 2441 { 2442 int free_bytes; 2443 int need_bytes; 2444 SPLDECL(s); 2445 #ifdef DEBUG 2446 xfs_lsn_t tail_lsn; 2447 #endif 2448 2449 2450 #ifdef DEBUG 2451 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2452 panic("grant Recovery problem"); 2453 #endif 2454 2455 /* Is there space or do we need to sleep? */ 2456 s = GRANT_LOCK(log); 2457 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); 2458 2459 /* something is already sleeping; insert new transaction at end */ 2460 if (log->l_reserve_headq) { 2461 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2462 xlog_trace_loggrant(log, tic, 2463 "xlog_grant_log_space: sleep 1"); 2464 /* 2465 * Gotta check this before going to sleep, while we're 2466 * holding the grant lock. 2467 */ 2468 if (XLOG_FORCED_SHUTDOWN(log)) 2469 goto error_return; 2470 2471 XFS_STATS_INC(xs_sleep_logspace); 2472 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2473 /* 2474 * If we got an error, and the filesystem is shutting down, 2475 * we'll catch it down below. So just continue... 2476 */ 2477 xlog_trace_loggrant(log, tic, 2478 "xlog_grant_log_space: wake 1"); 2479 s = GRANT_LOCK(log); 2480 } 2481 if (tic->t_flags & XFS_LOG_PERM_RESERV) 2482 need_bytes = tic->t_unit_res*tic->t_ocnt; 2483 else 2484 need_bytes = tic->t_unit_res; 2485 2486 redo: 2487 if (XLOG_FORCED_SHUTDOWN(log)) 2488 goto error_return; 2489 2490 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, 2491 log->l_grant_reserve_bytes); 2492 if (free_bytes < need_bytes) { 2493 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2494 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2495 xlog_trace_loggrant(log, tic, 2496 "xlog_grant_log_space: sleep 2"); 2497 XFS_STATS_INC(xs_sleep_logspace); 2498 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2499 2500 if (XLOG_FORCED_SHUTDOWN(log)) { 2501 s = GRANT_LOCK(log); 2502 goto error_return; 2503 } 2504 2505 xlog_trace_loggrant(log, tic, 2506 "xlog_grant_log_space: wake 2"); 2507 xlog_grant_push_ail(log->l_mp, need_bytes); 2508 s = GRANT_LOCK(log); 2509 goto redo; 2510 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2511 xlog_del_ticketq(&log->l_reserve_headq, tic); 2512 2513 /* we've got enough space */ 2514 xlog_grant_add_space(log, need_bytes); 2515 #ifdef DEBUG 2516 tail_lsn = log->l_tail_lsn; 2517 /* 2518 * Check to make sure the grant write head didn't just over lap the 2519 * tail. If the cycles are the same, we can't be overlapping. 2520 * Otherwise, make sure that the cycles differ by exactly one and 2521 * check the byte count. 2522 */ 2523 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2524 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2525 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2526 } 2527 #endif 2528 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); 2529 xlog_verify_grant_head(log, 1); 2530 GRANT_UNLOCK(log, s); 2531 return 0; 2532 2533 error_return: 2534 if (tic->t_flags & XLOG_TIC_IN_Q) 2535 xlog_del_ticketq(&log->l_reserve_headq, tic); 2536 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); 2537 /* 2538 * If we are failing, make sure the ticket doesn't have any 2539 * current reservations. We don't want to add this back when 2540 * the ticket/transaction gets cancelled. 2541 */ 2542 tic->t_curr_res = 0; 2543 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2544 GRANT_UNLOCK(log, s); 2545 return XFS_ERROR(EIO); 2546 } /* xlog_grant_log_space */ 2547 2548 2549 /* 2550 * Replenish the byte reservation required by moving the grant write head. 2551 * 2552 * 2553 */ 2554 STATIC int 2555 xlog_regrant_write_log_space(xlog_t *log, 2556 xlog_ticket_t *tic) 2557 { 2558 SPLDECL(s); 2559 int free_bytes, need_bytes; 2560 xlog_ticket_t *ntic; 2561 #ifdef DEBUG 2562 xfs_lsn_t tail_lsn; 2563 #endif 2564 2565 tic->t_curr_res = tic->t_unit_res; 2566 XLOG_TIC_RESET_RES(tic); 2567 2568 if (tic->t_cnt > 0) 2569 return 0; 2570 2571 #ifdef DEBUG 2572 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2573 panic("regrant Recovery problem"); 2574 #endif 2575 2576 s = GRANT_LOCK(log); 2577 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); 2578 2579 if (XLOG_FORCED_SHUTDOWN(log)) 2580 goto error_return; 2581 2582 /* If there are other waiters on the queue then give them a 2583 * chance at logspace before us. Wake up the first waiters, 2584 * if we do not wake up all the waiters then go to sleep waiting 2585 * for more free space, otherwise try to get some space for 2586 * this transaction. 2587 */ 2588 2589 if ((ntic = log->l_write_headq)) { 2590 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2591 log->l_grant_write_bytes); 2592 do { 2593 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); 2594 2595 if (free_bytes < ntic->t_unit_res) 2596 break; 2597 free_bytes -= ntic->t_unit_res; 2598 sv_signal(&ntic->t_sema); 2599 ntic = ntic->t_next; 2600 } while (ntic != log->l_write_headq); 2601 2602 if (ntic != log->l_write_headq) { 2603 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2604 xlog_ins_ticketq(&log->l_write_headq, tic); 2605 2606 xlog_trace_loggrant(log, tic, 2607 "xlog_regrant_write_log_space: sleep 1"); 2608 XFS_STATS_INC(xs_sleep_logspace); 2609 sv_wait(&tic->t_sema, PINOD|PLTWAIT, 2610 &log->l_grant_lock, s); 2611 2612 /* If we're shutting down, this tic is already 2613 * off the queue */ 2614 if (XLOG_FORCED_SHUTDOWN(log)) { 2615 s = GRANT_LOCK(log); 2616 goto error_return; 2617 } 2618 2619 xlog_trace_loggrant(log, tic, 2620 "xlog_regrant_write_log_space: wake 1"); 2621 xlog_grant_push_ail(log->l_mp, tic->t_unit_res); 2622 s = GRANT_LOCK(log); 2623 } 2624 } 2625 2626 need_bytes = tic->t_unit_res; 2627 2628 redo: 2629 if (XLOG_FORCED_SHUTDOWN(log)) 2630 goto error_return; 2631 2632 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2633 log->l_grant_write_bytes); 2634 if (free_bytes < need_bytes) { 2635 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2636 xlog_ins_ticketq(&log->l_write_headq, tic); 2637 XFS_STATS_INC(xs_sleep_logspace); 2638 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2639 2640 /* If we're shutting down, this tic is already off the queue */ 2641 if (XLOG_FORCED_SHUTDOWN(log)) { 2642 s = GRANT_LOCK(log); 2643 goto error_return; 2644 } 2645 2646 xlog_trace_loggrant(log, tic, 2647 "xlog_regrant_write_log_space: wake 2"); 2648 xlog_grant_push_ail(log->l_mp, need_bytes); 2649 s = GRANT_LOCK(log); 2650 goto redo; 2651 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2652 xlog_del_ticketq(&log->l_write_headq, tic); 2653 2654 /* we've got enough space */ 2655 xlog_grant_add_space_write(log, need_bytes); 2656 #ifdef DEBUG 2657 tail_lsn = log->l_tail_lsn; 2658 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2659 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2660 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2661 } 2662 #endif 2663 2664 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); 2665 xlog_verify_grant_head(log, 1); 2666 GRANT_UNLOCK(log, s); 2667 return 0; 2668 2669 2670 error_return: 2671 if (tic->t_flags & XLOG_TIC_IN_Q) 2672 xlog_del_ticketq(&log->l_reserve_headq, tic); 2673 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); 2674 /* 2675 * If we are failing, make sure the ticket doesn't have any 2676 * current reservations. We don't want to add this back when 2677 * the ticket/transaction gets cancelled. 2678 */ 2679 tic->t_curr_res = 0; 2680 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2681 GRANT_UNLOCK(log, s); 2682 return XFS_ERROR(EIO); 2683 } /* xlog_regrant_write_log_space */ 2684 2685 2686 /* The first cnt-1 times through here we don't need to 2687 * move the grant write head because the permanent 2688 * reservation has reserved cnt times the unit amount. 2689 * Release part of current permanent unit reservation and 2690 * reset current reservation to be one units worth. Also 2691 * move grant reservation head forward. 2692 */ 2693 STATIC void 2694 xlog_regrant_reserve_log_space(xlog_t *log, 2695 xlog_ticket_t *ticket) 2696 { 2697 SPLDECL(s); 2698 2699 xlog_trace_loggrant(log, ticket, 2700 "xlog_regrant_reserve_log_space: enter"); 2701 if (ticket->t_cnt > 0) 2702 ticket->t_cnt--; 2703 2704 s = GRANT_LOCK(log); 2705 xlog_grant_sub_space(log, ticket->t_curr_res); 2706 ticket->t_curr_res = ticket->t_unit_res; 2707 XLOG_TIC_RESET_RES(ticket); 2708 xlog_trace_loggrant(log, ticket, 2709 "xlog_regrant_reserve_log_space: sub current res"); 2710 xlog_verify_grant_head(log, 1); 2711 2712 /* just return if we still have some of the pre-reserved space */ 2713 if (ticket->t_cnt > 0) { 2714 GRANT_UNLOCK(log, s); 2715 return; 2716 } 2717 2718 xlog_grant_add_space_reserve(log, ticket->t_unit_res); 2719 xlog_trace_loggrant(log, ticket, 2720 "xlog_regrant_reserve_log_space: exit"); 2721 xlog_verify_grant_head(log, 0); 2722 GRANT_UNLOCK(log, s); 2723 ticket->t_curr_res = ticket->t_unit_res; 2724 XLOG_TIC_RESET_RES(ticket); 2725 } /* xlog_regrant_reserve_log_space */ 2726 2727 2728 /* 2729 * Give back the space left from a reservation. 2730 * 2731 * All the information we need to make a correct determination of space left 2732 * is present. For non-permanent reservations, things are quite easy. The 2733 * count should have been decremented to zero. We only need to deal with the 2734 * space remaining in the current reservation part of the ticket. If the 2735 * ticket contains a permanent reservation, there may be left over space which 2736 * needs to be released. A count of N means that N-1 refills of the current 2737 * reservation can be done before we need to ask for more space. The first 2738 * one goes to fill up the first current reservation. Once we run out of 2739 * space, the count will stay at zero and the only space remaining will be 2740 * in the current reservation field. 2741 */ 2742 STATIC void 2743 xlog_ungrant_log_space(xlog_t *log, 2744 xlog_ticket_t *ticket) 2745 { 2746 SPLDECL(s); 2747 2748 if (ticket->t_cnt > 0) 2749 ticket->t_cnt--; 2750 2751 s = GRANT_LOCK(log); 2752 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); 2753 2754 xlog_grant_sub_space(log, ticket->t_curr_res); 2755 2756 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); 2757 2758 /* If this is a permanent reservation ticket, we may be able to free 2759 * up more space based on the remaining count. 2760 */ 2761 if (ticket->t_cnt > 0) { 2762 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); 2763 xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); 2764 } 2765 2766 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); 2767 xlog_verify_grant_head(log, 1); 2768 GRANT_UNLOCK(log, s); 2769 xfs_log_move_tail(log->l_mp, 1); 2770 } /* xlog_ungrant_log_space */ 2771 2772 2773 /* 2774 * Atomically put back used ticket. 2775 */ 2776 void 2777 xlog_state_put_ticket(xlog_t *log, 2778 xlog_ticket_t *tic) 2779 { 2780 unsigned long s; 2781 2782 s = LOG_LOCK(log); 2783 xlog_ticket_put(log, tic); 2784 LOG_UNLOCK(log, s); 2785 } /* xlog_state_put_ticket */ 2786 2787 /* 2788 * Flush iclog to disk if this is the last reference to the given iclog and 2789 * the WANT_SYNC bit is set. 2790 * 2791 * When this function is entered, the iclog is not necessarily in the 2792 * WANT_SYNC state. It may be sitting around waiting to get filled. 2793 * 2794 * 2795 */ 2796 int 2797 xlog_state_release_iclog(xlog_t *log, 2798 xlog_in_core_t *iclog) 2799 { 2800 SPLDECL(s); 2801 int sync = 0; /* do we sync? */ 2802 2803 xlog_assign_tail_lsn(log->l_mp); 2804 2805 s = LOG_LOCK(log); 2806 2807 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2808 LOG_UNLOCK(log, s); 2809 return XFS_ERROR(EIO); 2810 } 2811 2812 ASSERT(iclog->ic_refcnt > 0); 2813 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || 2814 iclog->ic_state == XLOG_STATE_WANT_SYNC); 2815 2816 if (--iclog->ic_refcnt == 0 && 2817 iclog->ic_state == XLOG_STATE_WANT_SYNC) { 2818 sync++; 2819 iclog->ic_state = XLOG_STATE_SYNCING; 2820 INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn); 2821 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); 2822 /* cycle incremented when incrementing curr_block */ 2823 } 2824 2825 LOG_UNLOCK(log, s); 2826 2827 /* 2828 * We let the log lock go, so it's possible that we hit a log I/O 2829 * error or some other SHUTDOWN condition that marks the iclog 2830 * as XLOG_STATE_IOERROR before the bwrite. However, we know that 2831 * this iclog has consistent data, so we ignore IOERROR 2832 * flags after this point. 2833 */ 2834 if (sync) { 2835 return xlog_sync(log, iclog); 2836 } 2837 return 0; 2838 2839 } /* xlog_state_release_iclog */ 2840 2841 2842 /* 2843 * This routine will mark the current iclog in the ring as WANT_SYNC 2844 * and move the current iclog pointer to the next iclog in the ring. 2845 * When this routine is called from xlog_state_get_iclog_space(), the 2846 * exact size of the iclog has not yet been determined. All we know is 2847 * that every data block. We have run out of space in this log record. 2848 */ 2849 STATIC void 2850 xlog_state_switch_iclogs(xlog_t *log, 2851 xlog_in_core_t *iclog, 2852 int eventual_size) 2853 { 2854 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2855 if (!eventual_size) 2856 eventual_size = iclog->ic_offset; 2857 iclog->ic_state = XLOG_STATE_WANT_SYNC; 2858 INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block); 2859 log->l_prev_block = log->l_curr_block; 2860 log->l_prev_cycle = log->l_curr_cycle; 2861 2862 /* roll log?: ic_offset changed later */ 2863 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); 2864 2865 /* Round up to next log-sunit */ 2866 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 2867 log->l_mp->m_sb.sb_logsunit > 1) { 2868 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); 2869 log->l_curr_block = roundup(log->l_curr_block, sunit_bb); 2870 } 2871 2872 if (log->l_curr_block >= log->l_logBBsize) { 2873 log->l_curr_cycle++; 2874 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) 2875 log->l_curr_cycle++; 2876 log->l_curr_block -= log->l_logBBsize; 2877 ASSERT(log->l_curr_block >= 0); 2878 } 2879 ASSERT(iclog == log->l_iclog); 2880 log->l_iclog = iclog->ic_next; 2881 } /* xlog_state_switch_iclogs */ 2882 2883 2884 /* 2885 * Write out all data in the in-core log as of this exact moment in time. 2886 * 2887 * Data may be written to the in-core log during this call. However, 2888 * we don't guarantee this data will be written out. A change from past 2889 * implementation means this routine will *not* write out zero length LRs. 2890 * 2891 * Basically, we try and perform an intelligent scan of the in-core logs. 2892 * If we determine there is no flushable data, we just return. There is no 2893 * flushable data if: 2894 * 2895 * 1. the current iclog is active and has no data; the previous iclog 2896 * is in the active or dirty state. 2897 * 2. the current iclog is drity, and the previous iclog is in the 2898 * active or dirty state. 2899 * 2900 * We may sleep (call psema) if: 2901 * 2902 * 1. the current iclog is not in the active nor dirty state. 2903 * 2. the current iclog dirty, and the previous iclog is not in the 2904 * active nor dirty state. 2905 * 3. the current iclog is active, and there is another thread writing 2906 * to this particular iclog. 2907 * 4. a) the current iclog is active and has no other writers 2908 * b) when we return from flushing out this iclog, it is still 2909 * not in the active nor dirty state. 2910 */ 2911 STATIC int 2912 xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed) 2913 { 2914 xlog_in_core_t *iclog; 2915 xfs_lsn_t lsn; 2916 SPLDECL(s); 2917 2918 s = LOG_LOCK(log); 2919 2920 iclog = log->l_iclog; 2921 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2922 LOG_UNLOCK(log, s); 2923 return XFS_ERROR(EIO); 2924 } 2925 2926 /* If the head iclog is not active nor dirty, we just attach 2927 * ourselves to the head and go to sleep. 2928 */ 2929 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2930 iclog->ic_state == XLOG_STATE_DIRTY) { 2931 /* 2932 * If the head is dirty or (active and empty), then 2933 * we need to look at the previous iclog. If the previous 2934 * iclog is active or dirty we are done. There is nothing 2935 * to sync out. Otherwise, we attach ourselves to the 2936 * previous iclog and go to sleep. 2937 */ 2938 if (iclog->ic_state == XLOG_STATE_DIRTY || 2939 (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) { 2940 iclog = iclog->ic_prev; 2941 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2942 iclog->ic_state == XLOG_STATE_DIRTY) 2943 goto no_sleep; 2944 else 2945 goto maybe_sleep; 2946 } else { 2947 if (iclog->ic_refcnt == 0) { 2948 /* We are the only one with access to this 2949 * iclog. Flush it out now. There should 2950 * be a roundoff of zero to show that someone 2951 * has already taken care of the roundoff from 2952 * the previous sync. 2953 */ 2954 iclog->ic_refcnt++; 2955 lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2956 xlog_state_switch_iclogs(log, iclog, 0); 2957 LOG_UNLOCK(log, s); 2958 2959 if (xlog_state_release_iclog(log, iclog)) 2960 return XFS_ERROR(EIO); 2961 *log_flushed = 1; 2962 s = LOG_LOCK(log); 2963 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn && 2964 iclog->ic_state != XLOG_STATE_DIRTY) 2965 goto maybe_sleep; 2966 else 2967 goto no_sleep; 2968 } else { 2969 /* Someone else is writing to this iclog. 2970 * Use its call to flush out the data. However, 2971 * the other thread may not force out this LR, 2972 * so we mark it WANT_SYNC. 2973 */ 2974 xlog_state_switch_iclogs(log, iclog, 0); 2975 goto maybe_sleep; 2976 } 2977 } 2978 } 2979 2980 /* By the time we come around again, the iclog could've been filled 2981 * which would give it another lsn. If we have a new lsn, just 2982 * return because the relevant data has been flushed. 2983 */ 2984 maybe_sleep: 2985 if (flags & XFS_LOG_SYNC) { 2986 /* 2987 * We must check if we're shutting down here, before 2988 * we wait, while we're holding the LOG_LOCK. 2989 * Then we check again after waking up, in case our 2990 * sleep was disturbed by a bad news. 2991 */ 2992 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2993 LOG_UNLOCK(log, s); 2994 return XFS_ERROR(EIO); 2995 } 2996 XFS_STATS_INC(xs_log_force_sleep); 2997 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s); 2998 /* 2999 * No need to grab the log lock here since we're 3000 * only deciding whether or not to return EIO 3001 * and the memory read should be atomic. 3002 */ 3003 if (iclog->ic_state & XLOG_STATE_IOERROR) 3004 return XFS_ERROR(EIO); 3005 *log_flushed = 1; 3006 3007 } else { 3008 3009 no_sleep: 3010 LOG_UNLOCK(log, s); 3011 } 3012 return 0; 3013 } /* xlog_state_sync_all */ 3014 3015 3016 /* 3017 * Used by code which implements synchronous log forces. 3018 * 3019 * Find in-core log with lsn. 3020 * If it is in the DIRTY state, just return. 3021 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC 3022 * state and go to sleep or return. 3023 * If it is in any other state, go to sleep or return. 3024 * 3025 * If filesystem activity goes to zero, the iclog will get flushed only by 3026 * bdflush(). 3027 */ 3028 int 3029 xlog_state_sync(xlog_t *log, 3030 xfs_lsn_t lsn, 3031 uint flags, 3032 int *log_flushed) 3033 { 3034 xlog_in_core_t *iclog; 3035 int already_slept = 0; 3036 SPLDECL(s); 3037 3038 3039 try_again: 3040 s = LOG_LOCK(log); 3041 iclog = log->l_iclog; 3042 3043 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3044 LOG_UNLOCK(log, s); 3045 return XFS_ERROR(EIO); 3046 } 3047 3048 do { 3049 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) { 3050 iclog = iclog->ic_next; 3051 continue; 3052 } 3053 3054 if (iclog->ic_state == XLOG_STATE_DIRTY) { 3055 LOG_UNLOCK(log, s); 3056 return 0; 3057 } 3058 3059 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3060 /* 3061 * We sleep here if we haven't already slept (e.g. 3062 * this is the first time we've looked at the correct 3063 * iclog buf) and the buffer before us is going to 3064 * be sync'ed. The reason for this is that if we 3065 * are doing sync transactions here, by waiting for 3066 * the previous I/O to complete, we can allow a few 3067 * more transactions into this iclog before we close 3068 * it down. 3069 * 3070 * Otherwise, we mark the buffer WANT_SYNC, and bump 3071 * up the refcnt so we can release the log (which drops 3072 * the ref count). The state switch keeps new transaction 3073 * commits from using this buffer. When the current commits 3074 * finish writing into the buffer, the refcount will drop to 3075 * zero and the buffer will go out then. 3076 */ 3077 if (!already_slept && 3078 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | 3079 XLOG_STATE_SYNCING))) { 3080 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); 3081 XFS_STATS_INC(xs_log_force_sleep); 3082 sv_wait(&iclog->ic_prev->ic_writesema, PSWP, 3083 &log->l_icloglock, s); 3084 *log_flushed = 1; 3085 already_slept = 1; 3086 goto try_again; 3087 } else { 3088 iclog->ic_refcnt++; 3089 xlog_state_switch_iclogs(log, iclog, 0); 3090 LOG_UNLOCK(log, s); 3091 if (xlog_state_release_iclog(log, iclog)) 3092 return XFS_ERROR(EIO); 3093 *log_flushed = 1; 3094 s = LOG_LOCK(log); 3095 } 3096 } 3097 3098 if ((flags & XFS_LOG_SYNC) && /* sleep */ 3099 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { 3100 3101 /* 3102 * Don't wait on the forcesema if we know that we've 3103 * gotten a log write error. 3104 */ 3105 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3106 LOG_UNLOCK(log, s); 3107 return XFS_ERROR(EIO); 3108 } 3109 XFS_STATS_INC(xs_log_force_sleep); 3110 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s); 3111 /* 3112 * No need to grab the log lock here since we're 3113 * only deciding whether or not to return EIO 3114 * and the memory read should be atomic. 3115 */ 3116 if (iclog->ic_state & XLOG_STATE_IOERROR) 3117 return XFS_ERROR(EIO); 3118 *log_flushed = 1; 3119 } else { /* just return */ 3120 LOG_UNLOCK(log, s); 3121 } 3122 return 0; 3123 3124 } while (iclog != log->l_iclog); 3125 3126 LOG_UNLOCK(log, s); 3127 return 0; 3128 } /* xlog_state_sync */ 3129 3130 3131 /* 3132 * Called when we want to mark the current iclog as being ready to sync to 3133 * disk. 3134 */ 3135 void 3136 xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) 3137 { 3138 SPLDECL(s); 3139 3140 s = LOG_LOCK(log); 3141 3142 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3143 xlog_state_switch_iclogs(log, iclog, 0); 3144 } else { 3145 ASSERT(iclog->ic_state & 3146 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); 3147 } 3148 3149 LOG_UNLOCK(log, s); 3150 } /* xlog_state_want_sync */ 3151 3152 3153 3154 /***************************************************************************** 3155 * 3156 * TICKET functions 3157 * 3158 ***************************************************************************** 3159 */ 3160 3161 /* 3162 * Algorithm doesn't take into account page size. ;-( 3163 */ 3164 STATIC void 3165 xlog_state_ticket_alloc(xlog_t *log) 3166 { 3167 xlog_ticket_t *t_list; 3168 xlog_ticket_t *next; 3169 xfs_caddr_t buf; 3170 uint i = (NBPP / sizeof(xlog_ticket_t)) - 2; 3171 SPLDECL(s); 3172 3173 /* 3174 * The kmem_zalloc may sleep, so we shouldn't be holding the 3175 * global lock. XXXmiken: may want to use zone allocator. 3176 */ 3177 buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP); 3178 3179 s = LOG_LOCK(log); 3180 3181 /* Attach 1st ticket to Q, so we can keep track of allocated memory */ 3182 t_list = (xlog_ticket_t *)buf; 3183 t_list->t_next = log->l_unmount_free; 3184 log->l_unmount_free = t_list++; 3185 log->l_ticket_cnt++; 3186 log->l_ticket_tcnt++; 3187 3188 /* Next ticket becomes first ticket attached to ticket free list */ 3189 if (log->l_freelist != NULL) { 3190 ASSERT(log->l_tail != NULL); 3191 log->l_tail->t_next = t_list; 3192 } else { 3193 log->l_freelist = t_list; 3194 } 3195 log->l_ticket_cnt++; 3196 log->l_ticket_tcnt++; 3197 3198 /* Cycle through rest of alloc'ed memory, building up free Q */ 3199 for ( ; i > 0; i--) { 3200 next = t_list + 1; 3201 t_list->t_next = next; 3202 t_list = next; 3203 log->l_ticket_cnt++; 3204 log->l_ticket_tcnt++; 3205 } 3206 t_list->t_next = NULL; 3207 log->l_tail = t_list; 3208 LOG_UNLOCK(log, s); 3209 } /* xlog_state_ticket_alloc */ 3210 3211 3212 /* 3213 * Put ticket into free list 3214 * 3215 * Assumption: log lock is held around this call. 3216 */ 3217 STATIC void 3218 xlog_ticket_put(xlog_t *log, 3219 xlog_ticket_t *ticket) 3220 { 3221 sv_destroy(&ticket->t_sema); 3222 3223 /* 3224 * Don't think caching will make that much difference. It's 3225 * more important to make debug easier. 3226 */ 3227 #if 0 3228 /* real code will want to use LIFO for caching */ 3229 ticket->t_next = log->l_freelist; 3230 log->l_freelist = ticket; 3231 /* no need to clear fields */ 3232 #else 3233 /* When we debug, it is easier if tickets are cycled */ 3234 ticket->t_next = NULL; 3235 if (log->l_tail != 0) { 3236 log->l_tail->t_next = ticket; 3237 } else { 3238 ASSERT(log->l_freelist == 0); 3239 log->l_freelist = ticket; 3240 } 3241 log->l_tail = ticket; 3242 #endif /* DEBUG */ 3243 log->l_ticket_cnt++; 3244 } /* xlog_ticket_put */ 3245 3246 3247 /* 3248 * Grab ticket off freelist or allocation some more 3249 */ 3250 xlog_ticket_t * 3251 xlog_ticket_get(xlog_t *log, 3252 int unit_bytes, 3253 int cnt, 3254 char client, 3255 uint xflags) 3256 { 3257 xlog_ticket_t *tic; 3258 uint num_headers; 3259 SPLDECL(s); 3260 3261 alloc: 3262 if (log->l_freelist == NULL) 3263 xlog_state_ticket_alloc(log); /* potentially sleep */ 3264 3265 s = LOG_LOCK(log); 3266 if (log->l_freelist == NULL) { 3267 LOG_UNLOCK(log, s); 3268 goto alloc; 3269 } 3270 tic = log->l_freelist; 3271 log->l_freelist = tic->t_next; 3272 if (log->l_freelist == NULL) 3273 log->l_tail = NULL; 3274 log->l_ticket_cnt--; 3275 LOG_UNLOCK(log, s); 3276 3277 /* 3278 * Permanent reservations have up to 'cnt'-1 active log operations 3279 * in the log. A unit in this case is the amount of space for one 3280 * of these log operations. Normal reservations have a cnt of 1 3281 * and their unit amount is the total amount of space required. 3282 * 3283 * The following lines of code account for non-transaction data 3284 * which occupy space in the on-disk log. 3285 * 3286 * Normal form of a transaction is: 3287 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> 3288 * and then there are LR hdrs, split-recs and roundoff at end of syncs. 3289 * 3290 * We need to account for all the leadup data and trailer data 3291 * around the transaction data. 3292 * And then we need to account for the worst case in terms of using 3293 * more space. 3294 * The worst case will happen if: 3295 * - the placement of the transaction happens to be such that the 3296 * roundoff is at its maximum 3297 * - the transaction data is synced before the commit record is synced 3298 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> 3299 * Therefore the commit record is in its own Log Record. 3300 * This can happen as the commit record is called with its 3301 * own region to xlog_write(). 3302 * This then means that in the worst case, roundoff can happen for 3303 * the commit-rec as well. 3304 * The commit-rec is smaller than padding in this scenario and so it is 3305 * not added separately. 3306 */ 3307 3308 /* for trans header */ 3309 unit_bytes += sizeof(xlog_op_header_t); 3310 unit_bytes += sizeof(xfs_trans_header_t); 3311 3312 /* for start-rec */ 3313 unit_bytes += sizeof(xlog_op_header_t); 3314 3315 /* for LR headers */ 3316 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); 3317 unit_bytes += log->l_iclog_hsize * num_headers; 3318 3319 /* for commit-rec LR header - note: padding will subsume the ophdr */ 3320 unit_bytes += log->l_iclog_hsize; 3321 3322 /* for split-recs - ophdrs added when data split over LRs */ 3323 unit_bytes += sizeof(xlog_op_header_t) * num_headers; 3324 3325 /* for roundoff padding for transaction data and one for commit record */ 3326 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 3327 log->l_mp->m_sb.sb_logsunit > 1) { 3328 /* log su roundoff */ 3329 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; 3330 } else { 3331 /* BB roundoff */ 3332 unit_bytes += 2*BBSIZE; 3333 } 3334 3335 tic->t_unit_res = unit_bytes; 3336 tic->t_curr_res = unit_bytes; 3337 tic->t_cnt = cnt; 3338 tic->t_ocnt = cnt; 3339 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); 3340 tic->t_clientid = client; 3341 tic->t_flags = XLOG_TIC_INITED; 3342 tic->t_trans_type = 0; 3343 if (xflags & XFS_LOG_PERM_RESERV) 3344 tic->t_flags |= XLOG_TIC_PERM_RESERV; 3345 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick"); 3346 3347 XLOG_TIC_RESET_RES(tic); 3348 3349 return tic; 3350 } /* xlog_ticket_get */ 3351 3352 3353 /****************************************************************************** 3354 * 3355 * Log debug routines 3356 * 3357 ****************************************************************************** 3358 */ 3359 #if defined(DEBUG) 3360 /* 3361 * Make sure that the destination ptr is within the valid data region of 3362 * one of the iclogs. This uses backup pointers stored in a different 3363 * part of the log in case we trash the log structure. 3364 */ 3365 void 3366 xlog_verify_dest_ptr(xlog_t *log, 3367 __psint_t ptr) 3368 { 3369 int i; 3370 int good_ptr = 0; 3371 3372 for (i=0; i < log->l_iclog_bufs; i++) { 3373 if (ptr >= (__psint_t)log->l_iclog_bak[i] && 3374 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) 3375 good_ptr++; 3376 } 3377 if (! good_ptr) 3378 xlog_panic("xlog_verify_dest_ptr: invalid ptr"); 3379 } /* xlog_verify_dest_ptr */ 3380 3381 STATIC void 3382 xlog_verify_grant_head(xlog_t *log, int equals) 3383 { 3384 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { 3385 if (equals) 3386 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); 3387 else 3388 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); 3389 } else { 3390 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); 3391 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); 3392 } 3393 } /* xlog_verify_grant_head */ 3394 3395 /* check if it will fit */ 3396 STATIC void 3397 xlog_verify_tail_lsn(xlog_t *log, 3398 xlog_in_core_t *iclog, 3399 xfs_lsn_t tail_lsn) 3400 { 3401 int blocks; 3402 3403 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { 3404 blocks = 3405 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); 3406 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) 3407 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3408 } else { 3409 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); 3410 3411 if (BLOCK_LSN(tail_lsn) == log->l_prev_block) 3412 xlog_panic("xlog_verify_tail_lsn: tail wrapped"); 3413 3414 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; 3415 if (blocks < BTOBB(iclog->ic_offset) + 1) 3416 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3417 } 3418 } /* xlog_verify_tail_lsn */ 3419 3420 /* 3421 * Perform a number of checks on the iclog before writing to disk. 3422 * 3423 * 1. Make sure the iclogs are still circular 3424 * 2. Make sure we have a good magic number 3425 * 3. Make sure we don't have magic numbers in the data 3426 * 4. Check fields of each log operation header for: 3427 * A. Valid client identifier 3428 * B. tid ptr value falls in valid ptr space (user space code) 3429 * C. Length in log record header is correct according to the 3430 * individual operation headers within record. 3431 * 5. When a bwrite will occur within 5 blocks of the front of the physical 3432 * log, check the preceding blocks of the physical log to make sure all 3433 * the cycle numbers agree with the current cycle number. 3434 */ 3435 STATIC void 3436 xlog_verify_iclog(xlog_t *log, 3437 xlog_in_core_t *iclog, 3438 int count, 3439 boolean_t syncing) 3440 { 3441 xlog_op_header_t *ophead; 3442 xlog_in_core_t *icptr; 3443 xlog_in_core_2_t *xhdr; 3444 xfs_caddr_t ptr; 3445 xfs_caddr_t base_ptr; 3446 __psint_t field_offset; 3447 __uint8_t clientid; 3448 int len, i, j, k, op_len; 3449 int idx; 3450 SPLDECL(s); 3451 3452 /* check validity of iclog pointers */ 3453 s = LOG_LOCK(log); 3454 icptr = log->l_iclog; 3455 for (i=0; i < log->l_iclog_bufs; i++) { 3456 if (icptr == 0) 3457 xlog_panic("xlog_verify_iclog: invalid ptr"); 3458 icptr = icptr->ic_next; 3459 } 3460 if (icptr != log->l_iclog) 3461 xlog_panic("xlog_verify_iclog: corrupt iclog ring"); 3462 LOG_UNLOCK(log, s); 3463 3464 /* check log magic numbers */ 3465 ptr = (xfs_caddr_t) &(iclog->ic_header); 3466 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM) 3467 xlog_panic("xlog_verify_iclog: invalid magic num"); 3468 3469 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count; 3470 ptr += BBSIZE) { 3471 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 3472 xlog_panic("xlog_verify_iclog: unexpected magic num"); 3473 } 3474 3475 /* check fields */ 3476 len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT); 3477 ptr = iclog->ic_datap; 3478 base_ptr = ptr; 3479 ophead = (xlog_op_header_t *)ptr; 3480 xhdr = (xlog_in_core_2_t *)&iclog->ic_header; 3481 for (i = 0; i < len; i++) { 3482 ophead = (xlog_op_header_t *)ptr; 3483 3484 /* clientid is only 1 byte */ 3485 field_offset = (__psint_t) 3486 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); 3487 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3488 clientid = ophead->oh_clientid; 3489 } else { 3490 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); 3491 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3492 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3493 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3494 clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3495 } else { 3496 clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3497 } 3498 } 3499 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) 3500 cmn_err(CE_WARN, "xlog_verify_iclog: " 3501 "invalid clientid %d op 0x%p offset 0x%lx", 3502 clientid, ophead, (unsigned long)field_offset); 3503 3504 /* check length */ 3505 field_offset = (__psint_t) 3506 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); 3507 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3508 op_len = INT_GET(ophead->oh_len, ARCH_CONVERT); 3509 } else { 3510 idx = BTOBBT((__psint_t)&ophead->oh_len - 3511 (__psint_t)iclog->ic_datap); 3512 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3513 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3514 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3515 op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3516 } else { 3517 op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3518 } 3519 } 3520 ptr += sizeof(xlog_op_header_t) + op_len; 3521 } 3522 } /* xlog_verify_iclog */ 3523 #endif 3524 3525 /* 3526 * Mark all iclogs IOERROR. LOG_LOCK is held by the caller. 3527 */ 3528 STATIC int 3529 xlog_state_ioerror( 3530 xlog_t *log) 3531 { 3532 xlog_in_core_t *iclog, *ic; 3533 3534 iclog = log->l_iclog; 3535 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { 3536 /* 3537 * Mark all the incore logs IOERROR. 3538 * From now on, no log flushes will result. 3539 */ 3540 ic = iclog; 3541 do { 3542 ic->ic_state = XLOG_STATE_IOERROR; 3543 ic = ic->ic_next; 3544 } while (ic != iclog); 3545 return 0; 3546 } 3547 /* 3548 * Return non-zero, if state transition has already happened. 3549 */ 3550 return 1; 3551 } 3552 3553 /* 3554 * This is called from xfs_force_shutdown, when we're forcibly 3555 * shutting down the filesystem, typically because of an IO error. 3556 * Our main objectives here are to make sure that: 3557 * a. the filesystem gets marked 'SHUTDOWN' for all interested 3558 * parties to find out, 'atomically'. 3559 * b. those who're sleeping on log reservations, pinned objects and 3560 * other resources get woken up, and be told the bad news. 3561 * c. nothing new gets queued up after (a) and (b) are done. 3562 * d. if !logerror, flush the iclogs to disk, then seal them off 3563 * for business. 3564 */ 3565 int 3566 xfs_log_force_umount( 3567 struct xfs_mount *mp, 3568 int logerror) 3569 { 3570 xlog_ticket_t *tic; 3571 xlog_t *log; 3572 int retval; 3573 int dummy; 3574 SPLDECL(s); 3575 SPLDECL(s2); 3576 3577 log = mp->m_log; 3578 3579 /* 3580 * If this happens during log recovery, don't worry about 3581 * locking; the log isn't open for business yet. 3582 */ 3583 if (!log || 3584 log->l_flags & XLOG_ACTIVE_RECOVERY) { 3585 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3586 XFS_BUF_DONE(mp->m_sb_bp); 3587 return 0; 3588 } 3589 3590 /* 3591 * Somebody could've already done the hard work for us. 3592 * No need to get locks for this. 3593 */ 3594 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { 3595 ASSERT(XLOG_FORCED_SHUTDOWN(log)); 3596 return 1; 3597 } 3598 retval = 0; 3599 /* 3600 * We must hold both the GRANT lock and the LOG lock, 3601 * before we mark the filesystem SHUTDOWN and wake 3602 * everybody up to tell the bad news. 3603 */ 3604 s = GRANT_LOCK(log); 3605 s2 = LOG_LOCK(log); 3606 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3607 XFS_BUF_DONE(mp->m_sb_bp); 3608 /* 3609 * This flag is sort of redundant because of the mount flag, but 3610 * it's good to maintain the separation between the log and the rest 3611 * of XFS. 3612 */ 3613 log->l_flags |= XLOG_IO_ERROR; 3614 3615 /* 3616 * If we hit a log error, we want to mark all the iclogs IOERROR 3617 * while we're still holding the loglock. 3618 */ 3619 if (logerror) 3620 retval = xlog_state_ioerror(log); 3621 LOG_UNLOCK(log, s2); 3622 3623 /* 3624 * We don't want anybody waiting for log reservations 3625 * after this. That means we have to wake up everybody 3626 * queued up on reserve_headq as well as write_headq. 3627 * In addition, we make sure in xlog_{re}grant_log_space 3628 * that we don't enqueue anything once the SHUTDOWN flag 3629 * is set, and this action is protected by the GRANTLOCK. 3630 */ 3631 if ((tic = log->l_reserve_headq)) { 3632 do { 3633 sv_signal(&tic->t_sema); 3634 tic = tic->t_next; 3635 } while (tic != log->l_reserve_headq); 3636 } 3637 3638 if ((tic = log->l_write_headq)) { 3639 do { 3640 sv_signal(&tic->t_sema); 3641 tic = tic->t_next; 3642 } while (tic != log->l_write_headq); 3643 } 3644 GRANT_UNLOCK(log, s); 3645 3646 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { 3647 ASSERT(!logerror); 3648 /* 3649 * Force the incore logs to disk before shutting the 3650 * log down completely. 3651 */ 3652 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy); 3653 s2 = LOG_LOCK(log); 3654 retval = xlog_state_ioerror(log); 3655 LOG_UNLOCK(log, s2); 3656 } 3657 /* 3658 * Wake up everybody waiting on xfs_log_force. 3659 * Callback all log item committed functions as if the 3660 * log writes were completed. 3661 */ 3662 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); 3663 3664 #ifdef XFSERRORDEBUG 3665 { 3666 xlog_in_core_t *iclog; 3667 3668 s = LOG_LOCK(log); 3669 iclog = log->l_iclog; 3670 do { 3671 ASSERT(iclog->ic_callback == 0); 3672 iclog = iclog->ic_next; 3673 } while (iclog != log->l_iclog); 3674 LOG_UNLOCK(log, s); 3675 } 3676 #endif 3677 /* return non-zero if log IOERROR transition had already happened */ 3678 return retval; 3679 } 3680 3681 STATIC int 3682 xlog_iclogs_empty(xlog_t *log) 3683 { 3684 xlog_in_core_t *iclog; 3685 3686 iclog = log->l_iclog; 3687 do { 3688 /* endianness does not matter here, zero is zero in 3689 * any language. 3690 */ 3691 if (iclog->ic_header.h_num_logops) 3692 return 0; 3693 iclog = iclog->ic_next; 3694 } while (iclog != log->l_iclog); 3695 return 1; 3696 } 3697