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, 621 XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); 622 if (!error) { 623 /* remove inited flag */ 624 ((xlog_ticket_t *)tic)->t_flags = 0; 625 error = xlog_write(mp, reg, 1, tic, &lsn, 626 NULL, XLOG_UNMOUNT_TRANS); 627 /* 628 * At this point, we're umounting anyway, 629 * so there's no point in transitioning log state 630 * to IOERROR. Just continue... 631 */ 632 } 633 634 if (error) { 635 xfs_fs_cmn_err(CE_ALERT, mp, 636 "xfs_log_unmount: unmount record failed"); 637 } 638 639 640 s = LOG_LOCK(log); 641 iclog = log->l_iclog; 642 iclog->ic_refcnt++; 643 LOG_UNLOCK(log, s); 644 xlog_state_want_sync(log, iclog); 645 (void) xlog_state_release_iclog(log, iclog); 646 647 s = LOG_LOCK(log); 648 if (!(iclog->ic_state == XLOG_STATE_ACTIVE || 649 iclog->ic_state == XLOG_STATE_DIRTY)) { 650 if (!XLOG_FORCED_SHUTDOWN(log)) { 651 sv_wait(&iclog->ic_forcesema, PMEM, 652 &log->l_icloglock, s); 653 } else { 654 LOG_UNLOCK(log, s); 655 } 656 } else { 657 LOG_UNLOCK(log, s); 658 } 659 if (tic) { 660 xlog_trace_loggrant(log, tic, "unmount rec"); 661 xlog_ungrant_log_space(log, tic); 662 xlog_state_put_ticket(log, tic); 663 } 664 } else { 665 /* 666 * We're already in forced_shutdown mode, couldn't 667 * even attempt to write out the unmount transaction. 668 * 669 * Go through the motions of sync'ing and releasing 670 * the iclog, even though no I/O will actually happen, 671 * we need to wait for other log I/Os that may already 672 * be in progress. Do this as a separate section of 673 * code so we'll know if we ever get stuck here that 674 * we're in this odd situation of trying to unmount 675 * a file system that went into forced_shutdown as 676 * the result of an unmount.. 677 */ 678 s = LOG_LOCK(log); 679 iclog = log->l_iclog; 680 iclog->ic_refcnt++; 681 LOG_UNLOCK(log, s); 682 683 xlog_state_want_sync(log, iclog); 684 (void) xlog_state_release_iclog(log, iclog); 685 686 s = LOG_LOCK(log); 687 688 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE 689 || iclog->ic_state == XLOG_STATE_DIRTY 690 || iclog->ic_state == XLOG_STATE_IOERROR) ) { 691 692 sv_wait(&iclog->ic_forcesema, PMEM, 693 &log->l_icloglock, s); 694 } else { 695 LOG_UNLOCK(log, s); 696 } 697 } 698 699 return 0; 700 } /* xfs_log_unmount_write */ 701 702 /* 703 * Deallocate log structures for unmount/relocation. 704 */ 705 void 706 xfs_log_unmount_dealloc(xfs_mount_t *mp) 707 { 708 xlog_dealloc_log(mp->m_log); 709 } 710 711 /* 712 * Write region vectors to log. The write happens using the space reservation 713 * of the ticket (tic). It is not a requirement that all writes for a given 714 * transaction occur with one call to xfs_log_write(). 715 */ 716 int 717 xfs_log_write(xfs_mount_t * mp, 718 xfs_log_iovec_t reg[], 719 int nentries, 720 xfs_log_ticket_t tic, 721 xfs_lsn_t *start_lsn) 722 { 723 int error; 724 xlog_t *log = mp->m_log; 725 726 if (XLOG_FORCED_SHUTDOWN(log)) 727 return XFS_ERROR(EIO); 728 729 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { 730 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 731 } 732 return error; 733 } /* xfs_log_write */ 734 735 736 void 737 xfs_log_move_tail(xfs_mount_t *mp, 738 xfs_lsn_t tail_lsn) 739 { 740 xlog_ticket_t *tic; 741 xlog_t *log = mp->m_log; 742 int need_bytes, free_bytes, cycle, bytes; 743 SPLDECL(s); 744 745 if (XLOG_FORCED_SHUTDOWN(log)) 746 return; 747 ASSERT(!XFS_FORCED_SHUTDOWN(mp)); 748 749 if (tail_lsn == 0) { 750 /* needed since sync_lsn is 64 bits */ 751 s = LOG_LOCK(log); 752 tail_lsn = log->l_last_sync_lsn; 753 LOG_UNLOCK(log, s); 754 } 755 756 s = GRANT_LOCK(log); 757 758 /* Also an invalid lsn. 1 implies that we aren't passing in a valid 759 * tail_lsn. 760 */ 761 if (tail_lsn != 1) { 762 log->l_tail_lsn = tail_lsn; 763 } 764 765 if ((tic = log->l_write_headq)) { 766 #ifdef DEBUG 767 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 768 panic("Recovery problem"); 769 #endif 770 cycle = log->l_grant_write_cycle; 771 bytes = log->l_grant_write_bytes; 772 free_bytes = xlog_space_left(log, cycle, bytes); 773 do { 774 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); 775 776 if (free_bytes < tic->t_unit_res && tail_lsn != 1) 777 break; 778 tail_lsn = 0; 779 free_bytes -= tic->t_unit_res; 780 sv_signal(&tic->t_sema); 781 tic = tic->t_next; 782 } while (tic != log->l_write_headq); 783 } 784 if ((tic = log->l_reserve_headq)) { 785 #ifdef DEBUG 786 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 787 panic("Recovery problem"); 788 #endif 789 cycle = log->l_grant_reserve_cycle; 790 bytes = log->l_grant_reserve_bytes; 791 free_bytes = xlog_space_left(log, cycle, bytes); 792 do { 793 if (tic->t_flags & XLOG_TIC_PERM_RESERV) 794 need_bytes = tic->t_unit_res*tic->t_cnt; 795 else 796 need_bytes = tic->t_unit_res; 797 if (free_bytes < need_bytes && tail_lsn != 1) 798 break; 799 tail_lsn = 0; 800 free_bytes -= need_bytes; 801 sv_signal(&tic->t_sema); 802 tic = tic->t_next; 803 } while (tic != log->l_reserve_headq); 804 } 805 GRANT_UNLOCK(log, s); 806 } /* xfs_log_move_tail */ 807 808 /* 809 * Determine if we have a transaction that has gone to disk 810 * that needs to be covered. Log activity needs to be idle (no AIL and 811 * nothing in the iclogs). And, we need to be in the right state indicating 812 * something has gone out. 813 */ 814 int 815 xfs_log_need_covered(xfs_mount_t *mp) 816 { 817 SPLDECL(s); 818 int needed = 0, gen; 819 xlog_t *log = mp->m_log; 820 821 if (!xfs_fs_writable(mp)) 822 return 0; 823 824 s = LOG_LOCK(log); 825 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || 826 (log->l_covered_state == XLOG_STATE_COVER_NEED2)) 827 && !xfs_trans_first_ail(mp, &gen) 828 && xlog_iclogs_empty(log)) { 829 if (log->l_covered_state == XLOG_STATE_COVER_NEED) 830 log->l_covered_state = XLOG_STATE_COVER_DONE; 831 else { 832 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); 833 log->l_covered_state = XLOG_STATE_COVER_DONE2; 834 } 835 needed = 1; 836 } 837 LOG_UNLOCK(log, s); 838 return needed; 839 } 840 841 /****************************************************************************** 842 * 843 * local routines 844 * 845 ****************************************************************************** 846 */ 847 848 /* xfs_trans_tail_ail returns 0 when there is nothing in the list. 849 * The log manager must keep track of the last LR which was committed 850 * to disk. The lsn of this LR will become the new tail_lsn whenever 851 * xfs_trans_tail_ail returns 0. If we don't do this, we run into 852 * the situation where stuff could be written into the log but nothing 853 * was ever in the AIL when asked. Eventually, we panic since the 854 * tail hits the head. 855 * 856 * We may be holding the log iclog lock upon entering this routine. 857 */ 858 xfs_lsn_t 859 xlog_assign_tail_lsn(xfs_mount_t *mp) 860 { 861 xfs_lsn_t tail_lsn; 862 SPLDECL(s); 863 xlog_t *log = mp->m_log; 864 865 tail_lsn = xfs_trans_tail_ail(mp); 866 s = GRANT_LOCK(log); 867 if (tail_lsn != 0) { 868 log->l_tail_lsn = tail_lsn; 869 } else { 870 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; 871 } 872 GRANT_UNLOCK(log, s); 873 874 return tail_lsn; 875 } /* xlog_assign_tail_lsn */ 876 877 878 /* 879 * Return the space in the log between the tail and the head. The head 880 * is passed in the cycle/bytes formal parms. In the special case where 881 * the reserve head has wrapped passed the tail, this calculation is no 882 * longer valid. In this case, just return 0 which means there is no space 883 * in the log. This works for all places where this function is called 884 * with the reserve head. Of course, if the write head were to ever 885 * wrap the tail, we should blow up. Rather than catch this case here, 886 * we depend on other ASSERTions in other parts of the code. XXXmiken 887 * 888 * This code also handles the case where the reservation head is behind 889 * the tail. The details of this case are described below, but the end 890 * result is that we return the size of the log as the amount of space left. 891 */ 892 int 893 xlog_space_left(xlog_t *log, int cycle, int bytes) 894 { 895 int free_bytes; 896 int tail_bytes; 897 int tail_cycle; 898 899 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); 900 tail_cycle = CYCLE_LSN(log->l_tail_lsn); 901 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { 902 free_bytes = log->l_logsize - (bytes - tail_bytes); 903 } else if ((tail_cycle + 1) < cycle) { 904 return 0; 905 } else if (tail_cycle < cycle) { 906 ASSERT(tail_cycle == (cycle - 1)); 907 free_bytes = tail_bytes - bytes; 908 } else { 909 /* 910 * The reservation head is behind the tail. 911 * In this case we just want to return the size of the 912 * log as the amount of space left. 913 */ 914 xfs_fs_cmn_err(CE_ALERT, log->l_mp, 915 "xlog_space_left: head behind tail\n" 916 " tail_cycle = %d, tail_bytes = %d\n" 917 " GH cycle = %d, GH bytes = %d", 918 tail_cycle, tail_bytes, cycle, bytes); 919 ASSERT(0); 920 free_bytes = log->l_logsize; 921 } 922 return free_bytes; 923 } /* xlog_space_left */ 924 925 926 /* 927 * Log function which is called when an io completes. 928 * 929 * The log manager needs its own routine, in order to control what 930 * happens with the buffer after the write completes. 931 */ 932 void 933 xlog_iodone(xfs_buf_t *bp) 934 { 935 xlog_in_core_t *iclog; 936 xlog_t *l; 937 int aborted; 938 939 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 940 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); 941 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 942 aborted = 0; 943 944 /* 945 * Some versions of cpp barf on the recursive definition of 946 * ic_log -> hic_fields.ic_log and expand ic_log twice when 947 * it is passed through two macros. Workaround broken cpp. 948 */ 949 l = iclog->ic_log; 950 951 /* 952 * Race to shutdown the filesystem if we see an error. 953 */ 954 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, 955 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { 956 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); 957 XFS_BUF_STALE(bp); 958 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); 959 /* 960 * This flag will be propagated to the trans-committed 961 * callback routines to let them know that the log-commit 962 * didn't succeed. 963 */ 964 aborted = XFS_LI_ABORTED; 965 } else if (iclog->ic_state & XLOG_STATE_IOERROR) { 966 aborted = XFS_LI_ABORTED; 967 } 968 969 /* log I/O is always issued ASYNC */ 970 ASSERT(XFS_BUF_ISASYNC(bp)); 971 xlog_state_done_syncing(iclog, aborted); 972 /* 973 * do not reference the buffer (bp) here as we could race 974 * with it being freed after writing the unmount record to the 975 * log. 976 */ 977 978 } /* xlog_iodone */ 979 980 /* 981 * The bdstrat callback function for log bufs. This gives us a central 982 * place to trap bufs in case we get hit by a log I/O error and need to 983 * shutdown. Actually, in practice, even when we didn't get a log error, 984 * we transition the iclogs to IOERROR state *after* flushing all existing 985 * iclogs to disk. This is because we don't want anymore new transactions to be 986 * started or completed afterwards. 987 */ 988 STATIC int 989 xlog_bdstrat_cb(struct xfs_buf *bp) 990 { 991 xlog_in_core_t *iclog; 992 993 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 994 995 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { 996 /* note for irix bstrat will need struct bdevsw passed 997 * Fix the following macro if the code ever is merged 998 */ 999 XFS_bdstrat(bp); 1000 return 0; 1001 } 1002 1003 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); 1004 XFS_BUF_ERROR(bp, EIO); 1005 XFS_BUF_STALE(bp); 1006 xfs_biodone(bp); 1007 return XFS_ERROR(EIO); 1008 1009 1010 } 1011 1012 /* 1013 * Return size of each in-core log record buffer. 1014 * 1015 * Low memory machines only get 2 16KB buffers. We don't want to waste 1016 * memory here. However, all other machines get at least 2 32KB buffers. 1017 * The number is hard coded because we don't care about the minimum 1018 * memory size, just 32MB systems. 1019 * 1020 * If the filesystem blocksize is too large, we may need to choose a 1021 * larger size since the directory code currently logs entire blocks. 1022 */ 1023 1024 STATIC void 1025 xlog_get_iclog_buffer_size(xfs_mount_t *mp, 1026 xlog_t *log) 1027 { 1028 int size; 1029 int xhdrs; 1030 1031 if (mp->m_logbufs <= 0) { 1032 if (xfs_physmem <= btoc(128*1024*1024)) { 1033 log->l_iclog_bufs = XLOG_MIN_ICLOGS; 1034 } else if (xfs_physmem <= btoc(400*1024*1024)) { 1035 log->l_iclog_bufs = XLOG_MED_ICLOGS; 1036 } else { /* 256K with 32K bufs */ 1037 log->l_iclog_bufs = XLOG_MAX_ICLOGS; 1038 } 1039 } else { 1040 log->l_iclog_bufs = mp->m_logbufs; 1041 } 1042 1043 /* 1044 * Buffer size passed in from mount system call. 1045 */ 1046 if (mp->m_logbsize > 0) { 1047 size = log->l_iclog_size = mp->m_logbsize; 1048 log->l_iclog_size_log = 0; 1049 while (size != 1) { 1050 log->l_iclog_size_log++; 1051 size >>= 1; 1052 } 1053 1054 if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) { 1055 /* # headers = size / 32K 1056 * one header holds cycles from 32K of data 1057 */ 1058 1059 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; 1060 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) 1061 xhdrs++; 1062 log->l_iclog_hsize = xhdrs << BBSHIFT; 1063 log->l_iclog_heads = xhdrs; 1064 } else { 1065 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); 1066 log->l_iclog_hsize = BBSIZE; 1067 log->l_iclog_heads = 1; 1068 } 1069 goto done; 1070 } 1071 1072 /* 1073 * Special case machines that have less than 32MB of memory. 1074 * All machines with more memory use 32KB buffers. 1075 */ 1076 if (xfs_physmem <= btoc(32*1024*1024)) { 1077 /* Don't change; min configuration */ 1078 log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */ 1079 log->l_iclog_size_log = XLOG_RECORD_BSHIFT; 1080 } else { 1081 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */ 1082 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1083 } 1084 1085 /* the default log size is 16k or 32k which is one header sector */ 1086 log->l_iclog_hsize = BBSIZE; 1087 log->l_iclog_heads = 1; 1088 1089 /* 1090 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use 1091 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers. 1092 */ 1093 if (mp->m_sb.sb_blocksize >= 16*1024) { 1094 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; 1095 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1096 if (mp->m_logbufs <= 0) { 1097 switch (mp->m_sb.sb_blocksize) { 1098 case 16*1024: /* 16 KB */ 1099 log->l_iclog_bufs = 3; 1100 break; 1101 case 32*1024: /* 32 KB */ 1102 log->l_iclog_bufs = 4; 1103 break; 1104 case 64*1024: /* 64 KB */ 1105 log->l_iclog_bufs = 8; 1106 break; 1107 default: 1108 xlog_panic("XFS: Invalid blocksize"); 1109 break; 1110 } 1111 } 1112 } 1113 1114 done: /* are we being asked to make the sizes selected above visible? */ 1115 if (mp->m_logbufs == 0) 1116 mp->m_logbufs = log->l_iclog_bufs; 1117 if (mp->m_logbsize == 0) 1118 mp->m_logbsize = log->l_iclog_size; 1119 } /* xlog_get_iclog_buffer_size */ 1120 1121 1122 /* 1123 * This routine initializes some of the log structure for a given mount point. 1124 * Its primary purpose is to fill in enough, so recovery can occur. However, 1125 * some other stuff may be filled in too. 1126 */ 1127 STATIC xlog_t * 1128 xlog_alloc_log(xfs_mount_t *mp, 1129 xfs_buftarg_t *log_target, 1130 xfs_daddr_t blk_offset, 1131 int num_bblks) 1132 { 1133 xlog_t *log; 1134 xlog_rec_header_t *head; 1135 xlog_in_core_t **iclogp; 1136 xlog_in_core_t *iclog, *prev_iclog=NULL; 1137 xfs_buf_t *bp; 1138 int i; 1139 int iclogsize; 1140 1141 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP); 1142 1143 log->l_mp = mp; 1144 log->l_targ = log_target; 1145 log->l_logsize = BBTOB(num_bblks); 1146 log->l_logBBstart = blk_offset; 1147 log->l_logBBsize = num_bblks; 1148 log->l_covered_state = XLOG_STATE_COVER_IDLE; 1149 log->l_flags |= XLOG_ACTIVE_RECOVERY; 1150 1151 log->l_prev_block = -1; 1152 ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0); 1153 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ 1154 log->l_last_sync_lsn = log->l_tail_lsn; 1155 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ 1156 log->l_grant_reserve_cycle = 1; 1157 log->l_grant_write_cycle = 1; 1158 1159 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) { 1160 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; 1161 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); 1162 /* for larger sector sizes, must have v2 or external log */ 1163 ASSERT(log->l_sectbb_log == 0 || 1164 log->l_logBBstart == 0 || 1165 XFS_SB_VERSION_HASLOGV2(&mp->m_sb)); 1166 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); 1167 } 1168 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; 1169 1170 xlog_get_iclog_buffer_size(mp, log); 1171 1172 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1173 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1174 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1175 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1176 ASSERT(XFS_BUF_ISBUSY(bp)); 1177 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 1178 log->l_xbuf = bp; 1179 1180 spinlock_init(&log->l_icloglock, "iclog"); 1181 spinlock_init(&log->l_grant_lock, "grhead_iclog"); 1182 initnsema(&log->l_flushsema, 0, "ic-flush"); 1183 xlog_state_ticket_alloc(log); /* wait until after icloglock inited */ 1184 1185 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ 1186 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); 1187 1188 iclogp = &log->l_iclog; 1189 /* 1190 * The amount of memory to allocate for the iclog structure is 1191 * rather funky due to the way the structure is defined. It is 1192 * done this way so that we can use different sizes for machines 1193 * with different amounts of memory. See the definition of 1194 * xlog_in_core_t in xfs_log_priv.h for details. 1195 */ 1196 iclogsize = log->l_iclog_size; 1197 ASSERT(log->l_iclog_size >= 4096); 1198 for (i=0; i < log->l_iclog_bufs; i++) { 1199 *iclogp = (xlog_in_core_t *) 1200 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP); 1201 iclog = *iclogp; 1202 iclog->ic_prev = prev_iclog; 1203 prev_iclog = iclog; 1204 1205 bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp); 1206 if (!XFS_BUF_CPSEMA(bp)) 1207 ASSERT(0); 1208 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1209 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1210 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1211 iclog->ic_bp = bp; 1212 iclog->hic_data = bp->b_addr; 1213 1214 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); 1215 1216 head = &iclog->ic_header; 1217 memset(head, 0, sizeof(xlog_rec_header_t)); 1218 INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); 1219 INT_SET(head->h_version, ARCH_CONVERT, 1220 XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); 1221 INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size); 1222 /* new fields */ 1223 INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT); 1224 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); 1225 1226 1227 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; 1228 iclog->ic_state = XLOG_STATE_ACTIVE; 1229 iclog->ic_log = log; 1230 iclog->ic_callback_tail = &(iclog->ic_callback); 1231 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize; 1232 1233 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); 1234 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); 1235 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force"); 1236 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write"); 1237 1238 iclogp = &iclog->ic_next; 1239 } 1240 *iclogp = log->l_iclog; /* complete ring */ 1241 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ 1242 1243 return log; 1244 } /* xlog_alloc_log */ 1245 1246 1247 /* 1248 * Write out the commit record of a transaction associated with the given 1249 * ticket. Return the lsn of the commit record. 1250 */ 1251 STATIC int 1252 xlog_commit_record(xfs_mount_t *mp, 1253 xlog_ticket_t *ticket, 1254 xlog_in_core_t **iclog, 1255 xfs_lsn_t *commitlsnp) 1256 { 1257 int error; 1258 xfs_log_iovec_t reg[1]; 1259 1260 reg[0].i_addr = NULL; 1261 reg[0].i_len = 0; 1262 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); 1263 1264 ASSERT_ALWAYS(iclog); 1265 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, 1266 iclog, XLOG_COMMIT_TRANS))) { 1267 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 1268 } 1269 return error; 1270 } /* xlog_commit_record */ 1271 1272 1273 /* 1274 * Push on the buffer cache code if we ever use more than 75% of the on-disk 1275 * log space. This code pushes on the lsn which would supposedly free up 1276 * the 25% which we want to leave free. We may need to adopt a policy which 1277 * pushes on an lsn which is further along in the log once we reach the high 1278 * water mark. In this manner, we would be creating a low water mark. 1279 */ 1280 void 1281 xlog_grant_push_ail(xfs_mount_t *mp, 1282 int need_bytes) 1283 { 1284 xlog_t *log = mp->m_log; /* pointer to the log */ 1285 xfs_lsn_t tail_lsn; /* lsn of the log tail */ 1286 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ 1287 int free_blocks; /* free blocks left to write to */ 1288 int free_bytes; /* free bytes left to write to */ 1289 int threshold_block; /* block in lsn we'd like to be at */ 1290 int threshold_cycle; /* lsn cycle we'd like to be at */ 1291 int free_threshold; 1292 SPLDECL(s); 1293 1294 ASSERT(BTOBB(need_bytes) < log->l_logBBsize); 1295 1296 s = GRANT_LOCK(log); 1297 free_bytes = xlog_space_left(log, 1298 log->l_grant_reserve_cycle, 1299 log->l_grant_reserve_bytes); 1300 tail_lsn = log->l_tail_lsn; 1301 free_blocks = BTOBBT(free_bytes); 1302 1303 /* 1304 * Set the threshold for the minimum number of free blocks in the 1305 * log to the maximum of what the caller needs, one quarter of the 1306 * log, and 256 blocks. 1307 */ 1308 free_threshold = BTOBB(need_bytes); 1309 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); 1310 free_threshold = MAX(free_threshold, 256); 1311 if (free_blocks < free_threshold) { 1312 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; 1313 threshold_cycle = CYCLE_LSN(tail_lsn); 1314 if (threshold_block >= log->l_logBBsize) { 1315 threshold_block -= log->l_logBBsize; 1316 threshold_cycle += 1; 1317 } 1318 ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle, 1319 threshold_block); 1320 1321 /* Don't pass in an lsn greater than the lsn of the last 1322 * log record known to be on disk. 1323 */ 1324 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) 1325 threshold_lsn = log->l_last_sync_lsn; 1326 } 1327 GRANT_UNLOCK(log, s); 1328 1329 /* 1330 * Get the transaction layer to kick the dirty buffers out to 1331 * disk asynchronously. No point in trying to do this if 1332 * the filesystem is shutting down. 1333 */ 1334 if (threshold_lsn && 1335 !XLOG_FORCED_SHUTDOWN(log)) 1336 xfs_trans_push_ail(mp, threshold_lsn); 1337 } /* xlog_grant_push_ail */ 1338 1339 1340 /* 1341 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous 1342 * fashion. Previously, we should have moved the current iclog 1343 * ptr in the log to point to the next available iclog. This allows further 1344 * write to continue while this code syncs out an iclog ready to go. 1345 * Before an in-core log can be written out, the data section must be scanned 1346 * to save away the 1st word of each BBSIZE block into the header. We replace 1347 * it with the current cycle count. Each BBSIZE block is tagged with the 1348 * cycle count because there in an implicit assumption that drives will 1349 * guarantee that entire 512 byte blocks get written at once. In other words, 1350 * we can't have part of a 512 byte block written and part not written. By 1351 * tagging each block, we will know which blocks are valid when recovering 1352 * after an unclean shutdown. 1353 * 1354 * This routine is single threaded on the iclog. No other thread can be in 1355 * this routine with the same iclog. Changing contents of iclog can there- 1356 * fore be done without grabbing the state machine lock. Updating the global 1357 * log will require grabbing the lock though. 1358 * 1359 * The entire log manager uses a logical block numbering scheme. Only 1360 * log_sync (and then only bwrite()) know about the fact that the log may 1361 * not start with block zero on a given device. The log block start offset 1362 * is added immediately before calling bwrite(). 1363 */ 1364 1365 int 1366 xlog_sync(xlog_t *log, 1367 xlog_in_core_t *iclog) 1368 { 1369 xfs_caddr_t dptr; /* pointer to byte sized element */ 1370 xfs_buf_t *bp; 1371 int i, ops; 1372 uint count; /* byte count of bwrite */ 1373 uint count_init; /* initial count before roundup */ 1374 int roundoff; /* roundoff to BB or stripe */ 1375 int split = 0; /* split write into two regions */ 1376 int error; 1377 SPLDECL(s); 1378 int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb); 1379 1380 XFS_STATS_INC(xs_log_writes); 1381 ASSERT(iclog->ic_refcnt == 0); 1382 1383 /* Add for LR header */ 1384 count_init = log->l_iclog_hsize + iclog->ic_offset; 1385 1386 /* Round out the log write size */ 1387 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { 1388 /* we have a v2 stripe unit to use */ 1389 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); 1390 } else { 1391 count = BBTOB(BTOBB(count_init)); 1392 } 1393 roundoff = count - count_init; 1394 ASSERT(roundoff >= 0); 1395 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && 1396 roundoff < log->l_mp->m_sb.sb_logsunit) 1397 || 1398 (log->l_mp->m_sb.sb_logsunit <= 1 && 1399 roundoff < BBTOB(1))); 1400 1401 /* move grant heads by roundoff in sync */ 1402 s = GRANT_LOCK(log); 1403 xlog_grant_add_space(log, roundoff); 1404 GRANT_UNLOCK(log, s); 1405 1406 /* put cycle number in every block */ 1407 xlog_pack_data(log, iclog, roundoff); 1408 1409 /* real byte length */ 1410 if (v2) { 1411 INT_SET(iclog->ic_header.h_len, 1412 ARCH_CONVERT, 1413 iclog->ic_offset + roundoff); 1414 } else { 1415 INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset); 1416 } 1417 1418 /* put ops count in correct order */ 1419 ops = iclog->ic_header.h_num_logops; 1420 INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops); 1421 1422 bp = iclog->ic_bp; 1423 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); 1424 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1425 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT))); 1426 1427 XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); 1428 1429 /* Do we need to split this write into 2 parts? */ 1430 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { 1431 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); 1432 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); 1433 iclog->ic_bwritecnt = 2; /* split into 2 writes */ 1434 } else { 1435 iclog->ic_bwritecnt = 1; 1436 } 1437 XFS_BUF_SET_COUNT(bp, count); 1438 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ 1439 XFS_BUF_ZEROFLAGS(bp); 1440 XFS_BUF_BUSY(bp); 1441 XFS_BUF_ASYNC(bp); 1442 /* 1443 * Do an ordered write for the log block. 1444 * Its unnecessary to flush the first split block in the log wrap case. 1445 */ 1446 if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) 1447 XFS_BUF_ORDERED(bp); 1448 1449 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1450 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1451 1452 xlog_verify_iclog(log, iclog, count, B_TRUE); 1453 1454 /* account for log which doesn't start at block #0 */ 1455 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1456 /* 1457 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem 1458 * is shutting down. 1459 */ 1460 XFS_BUF_WRITE(bp); 1461 1462 if ((error = XFS_bwrite(bp))) { 1463 xfs_ioerror_alert("xlog_sync", log->l_mp, bp, 1464 XFS_BUF_ADDR(bp)); 1465 return error; 1466 } 1467 if (split) { 1468 bp = iclog->ic_log->l_xbuf; 1469 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == 1470 (unsigned long)1); 1471 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1472 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ 1473 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ 1474 (__psint_t)count), split); 1475 XFS_BUF_SET_FSPRIVATE(bp, iclog); 1476 XFS_BUF_ZEROFLAGS(bp); 1477 XFS_BUF_BUSY(bp); 1478 XFS_BUF_ASYNC(bp); 1479 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) 1480 XFS_BUF_ORDERED(bp); 1481 dptr = XFS_BUF_PTR(bp); 1482 /* 1483 * Bump the cycle numbers at the start of each block 1484 * since this part of the buffer is at the start of 1485 * a new cycle. Watch out for the header magic number 1486 * case, though. 1487 */ 1488 for (i=0; i<split; i += BBSIZE) { 1489 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1490 if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 1491 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1492 dptr += BBSIZE; 1493 } 1494 1495 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1496 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1497 1498 /* account for internal log which doesn't start at block #0 */ 1499 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1500 XFS_BUF_WRITE(bp); 1501 if ((error = XFS_bwrite(bp))) { 1502 xfs_ioerror_alert("xlog_sync (split)", log->l_mp, 1503 bp, XFS_BUF_ADDR(bp)); 1504 return error; 1505 } 1506 } 1507 return 0; 1508 } /* xlog_sync */ 1509 1510 1511 /* 1512 * Deallocate a log structure 1513 */ 1514 void 1515 xlog_dealloc_log(xlog_t *log) 1516 { 1517 xlog_in_core_t *iclog, *next_iclog; 1518 xlog_ticket_t *tic, *next_tic; 1519 int i; 1520 1521 1522 iclog = log->l_iclog; 1523 for (i=0; i<log->l_iclog_bufs; i++) { 1524 sv_destroy(&iclog->ic_forcesema); 1525 sv_destroy(&iclog->ic_writesema); 1526 xfs_buf_free(iclog->ic_bp); 1527 #ifdef XFS_LOG_TRACE 1528 if (iclog->ic_trace != NULL) { 1529 ktrace_free(iclog->ic_trace); 1530 } 1531 #endif 1532 next_iclog = iclog->ic_next; 1533 kmem_free(iclog, sizeof(xlog_in_core_t)); 1534 iclog = next_iclog; 1535 } 1536 freesema(&log->l_flushsema); 1537 spinlock_destroy(&log->l_icloglock); 1538 spinlock_destroy(&log->l_grant_lock); 1539 1540 /* XXXsup take a look at this again. */ 1541 if ((log->l_ticket_cnt != log->l_ticket_tcnt) && 1542 !XLOG_FORCED_SHUTDOWN(log)) { 1543 xfs_fs_cmn_err(CE_WARN, log->l_mp, 1544 "xlog_dealloc_log: (cnt: %d, total: %d)", 1545 log->l_ticket_cnt, log->l_ticket_tcnt); 1546 /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */ 1547 1548 } else { 1549 tic = log->l_unmount_free; 1550 while (tic) { 1551 next_tic = tic->t_next; 1552 kmem_free(tic, NBPP); 1553 tic = next_tic; 1554 } 1555 } 1556 xfs_buf_free(log->l_xbuf); 1557 #ifdef XFS_LOG_TRACE 1558 if (log->l_trace != NULL) { 1559 ktrace_free(log->l_trace); 1560 } 1561 if (log->l_grant_trace != NULL) { 1562 ktrace_free(log->l_grant_trace); 1563 } 1564 #endif 1565 log->l_mp->m_log = NULL; 1566 kmem_free(log, sizeof(xlog_t)); 1567 } /* xlog_dealloc_log */ 1568 1569 /* 1570 * Update counters atomically now that memcpy is done. 1571 */ 1572 /* ARGSUSED */ 1573 static inline void 1574 xlog_state_finish_copy(xlog_t *log, 1575 xlog_in_core_t *iclog, 1576 int record_cnt, 1577 int copy_bytes) 1578 { 1579 SPLDECL(s); 1580 1581 s = LOG_LOCK(log); 1582 1583 iclog->ic_header.h_num_logops += record_cnt; 1584 iclog->ic_offset += copy_bytes; 1585 1586 LOG_UNLOCK(log, s); 1587 } /* xlog_state_finish_copy */ 1588 1589 1590 1591 1592 /* 1593 * print out info relating to regions written which consume 1594 * the reservation 1595 */ 1596 STATIC void 1597 xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) 1598 { 1599 uint i; 1600 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); 1601 1602 /* match with XLOG_REG_TYPE_* in xfs_log.h */ 1603 static char *res_type_str[XLOG_REG_TYPE_MAX] = { 1604 "bformat", 1605 "bchunk", 1606 "efi_format", 1607 "efd_format", 1608 "iformat", 1609 "icore", 1610 "iext", 1611 "ibroot", 1612 "ilocal", 1613 "iattr_ext", 1614 "iattr_broot", 1615 "iattr_local", 1616 "qformat", 1617 "dquot", 1618 "quotaoff", 1619 "LR header", 1620 "unmount", 1621 "commit", 1622 "trans header" 1623 }; 1624 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { 1625 "SETATTR_NOT_SIZE", 1626 "SETATTR_SIZE", 1627 "INACTIVE", 1628 "CREATE", 1629 "CREATE_TRUNC", 1630 "TRUNCATE_FILE", 1631 "REMOVE", 1632 "LINK", 1633 "RENAME", 1634 "MKDIR", 1635 "RMDIR", 1636 "SYMLINK", 1637 "SET_DMATTRS", 1638 "GROWFS", 1639 "STRAT_WRITE", 1640 "DIOSTRAT", 1641 "WRITE_SYNC", 1642 "WRITEID", 1643 "ADDAFORK", 1644 "ATTRINVAL", 1645 "ATRUNCATE", 1646 "ATTR_SET", 1647 "ATTR_RM", 1648 "ATTR_FLAG", 1649 "CLEAR_AGI_BUCKET", 1650 "QM_SBCHANGE", 1651 "DUMMY1", 1652 "DUMMY2", 1653 "QM_QUOTAOFF", 1654 "QM_DQALLOC", 1655 "QM_SETQLIM", 1656 "QM_DQCLUSTER", 1657 "QM_QINOCREATE", 1658 "QM_QUOTAOFF_END", 1659 "SB_UNIT", 1660 "FSYNC_TS", 1661 "GROWFSRT_ALLOC", 1662 "GROWFSRT_ZERO", 1663 "GROWFSRT_FREE", 1664 "SWAPEXT" 1665 }; 1666 1667 xfs_fs_cmn_err(CE_WARN, mp, 1668 "xfs_log_write: reservation summary:\n" 1669 " trans type = %s (%u)\n" 1670 " unit res = %d bytes\n" 1671 " current res = %d bytes\n" 1672 " total reg = %u bytes (o/flow = %u bytes)\n" 1673 " ophdrs = %u (ophdr space = %u bytes)\n" 1674 " ophdr + reg = %u bytes\n" 1675 " num regions = %u\n", 1676 ((ticket->t_trans_type <= 0 || 1677 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? 1678 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), 1679 ticket->t_trans_type, 1680 ticket->t_unit_res, 1681 ticket->t_curr_res, 1682 ticket->t_res_arr_sum, ticket->t_res_o_flow, 1683 ticket->t_res_num_ophdrs, ophdr_spc, 1684 ticket->t_res_arr_sum + 1685 ticket->t_res_o_flow + ophdr_spc, 1686 ticket->t_res_num); 1687 1688 for (i = 0; i < ticket->t_res_num; i++) { 1689 uint r_type = ticket->t_res_arr[i].r_type; 1690 cmn_err(CE_WARN, 1691 "region[%u]: %s - %u bytes\n", 1692 i, 1693 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? 1694 "bad-rtype" : res_type_str[r_type-1]), 1695 ticket->t_res_arr[i].r_len); 1696 } 1697 } 1698 1699 /* 1700 * Write some region out to in-core log 1701 * 1702 * This will be called when writing externally provided regions or when 1703 * writing out a commit record for a given transaction. 1704 * 1705 * General algorithm: 1706 * 1. Find total length of this write. This may include adding to the 1707 * lengths passed in. 1708 * 2. Check whether we violate the tickets reservation. 1709 * 3. While writing to this iclog 1710 * A. Reserve as much space in this iclog as can get 1711 * B. If this is first write, save away start lsn 1712 * C. While writing this region: 1713 * 1. If first write of transaction, write start record 1714 * 2. Write log operation header (header per region) 1715 * 3. Find out if we can fit entire region into this iclog 1716 * 4. Potentially, verify destination memcpy ptr 1717 * 5. Memcpy (partial) region 1718 * 6. If partial copy, release iclog; otherwise, continue 1719 * copying more regions into current iclog 1720 * 4. Mark want sync bit (in simulation mode) 1721 * 5. Release iclog for potential flush to on-disk log. 1722 * 1723 * ERRORS: 1724 * 1. Panic if reservation is overrun. This should never happen since 1725 * reservation amounts are generated internal to the filesystem. 1726 * NOTES: 1727 * 1. Tickets are single threaded data structures. 1728 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the 1729 * syncing routine. When a single log_write region needs to span 1730 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set 1731 * on all log operation writes which don't contain the end of the 1732 * region. The XLOG_END_TRANS bit is used for the in-core log 1733 * operation which contains the end of the continued log_write region. 1734 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, 1735 * we don't really know exactly how much space will be used. As a result, 1736 * we don't update ic_offset until the end when we know exactly how many 1737 * bytes have been written out. 1738 */ 1739 int 1740 xlog_write(xfs_mount_t * mp, 1741 xfs_log_iovec_t reg[], 1742 int nentries, 1743 xfs_log_ticket_t tic, 1744 xfs_lsn_t *start_lsn, 1745 xlog_in_core_t **commit_iclog, 1746 uint flags) 1747 { 1748 xlog_t *log = mp->m_log; 1749 xlog_ticket_t *ticket = (xlog_ticket_t *)tic; 1750 xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ 1751 xlog_op_header_t *logop_head; /* ptr to log operation header */ 1752 __psint_t ptr; /* copy address into data region */ 1753 int len; /* # xlog_write() bytes 2 still copy */ 1754 int index; /* region index currently copying */ 1755 int log_offset; /* offset (from 0) into data region */ 1756 int start_rec_copy; /* # bytes to copy for start record */ 1757 int partial_copy; /* did we split a region? */ 1758 int partial_copy_len;/* # bytes copied if split region */ 1759 int need_copy; /* # bytes need to memcpy this region */ 1760 int copy_len; /* # bytes actually memcpy'ing */ 1761 int copy_off; /* # bytes from entry start */ 1762 int contwr; /* continued write of in-core log? */ 1763 int error; 1764 int record_cnt = 0, data_cnt = 0; 1765 1766 partial_copy_len = partial_copy = 0; 1767 1768 /* Calculate potential maximum space. Each region gets its own 1769 * xlog_op_header_t and may need to be double word aligned. 1770 */ 1771 len = 0; 1772 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ 1773 len += sizeof(xlog_op_header_t); 1774 XLOG_TIC_ADD_OPHDR(ticket); 1775 } 1776 1777 for (index = 0; index < nentries; index++) { 1778 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ 1779 XLOG_TIC_ADD_OPHDR(ticket); 1780 len += reg[index].i_len; 1781 XLOG_TIC_ADD_REGION(ticket, reg[index].i_len, reg[index].i_type); 1782 } 1783 contwr = *start_lsn = 0; 1784 1785 if (ticket->t_curr_res < len) { 1786 xlog_print_tic_res(mp, ticket); 1787 #ifdef DEBUG 1788 xlog_panic( 1789 "xfs_log_write: reservation ran out. Need to up reservation"); 1790 #else 1791 /* Customer configurable panic */ 1792 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, 1793 "xfs_log_write: reservation ran out. Need to up reservation"); 1794 /* If we did not panic, shutdown the filesystem */ 1795 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1796 #endif 1797 } else 1798 ticket->t_curr_res -= len; 1799 1800 for (index = 0; index < nentries; ) { 1801 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, 1802 &contwr, &log_offset))) 1803 return error; 1804 1805 ASSERT(log_offset <= iclog->ic_size - 1); 1806 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); 1807 1808 /* start_lsn is the first lsn written to. That's all we need. */ 1809 if (! *start_lsn) 1810 *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 1811 1812 /* This loop writes out as many regions as can fit in the amount 1813 * of space which was allocated by xlog_state_get_iclog_space(). 1814 */ 1815 while (index < nentries) { 1816 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); 1817 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); 1818 start_rec_copy = 0; 1819 1820 /* If first write for transaction, insert start record. 1821 * We can't be trying to commit if we are inited. We can't 1822 * have any "partial_copy" if we are inited. 1823 */ 1824 if (ticket->t_flags & XLOG_TIC_INITED) { 1825 logop_head = (xlog_op_header_t *)ptr; 1826 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1827 logop_head->oh_clientid = ticket->t_clientid; 1828 logop_head->oh_len = 0; 1829 logop_head->oh_flags = XLOG_START_TRANS; 1830 logop_head->oh_res2 = 0; 1831 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ 1832 record_cnt++; 1833 1834 start_rec_copy = sizeof(xlog_op_header_t); 1835 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); 1836 } 1837 1838 /* Copy log operation header directly into data section */ 1839 logop_head = (xlog_op_header_t *)ptr; 1840 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1841 logop_head->oh_clientid = ticket->t_clientid; 1842 logop_head->oh_res2 = 0; 1843 1844 /* header copied directly */ 1845 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); 1846 1847 /* are we copying a commit or unmount record? */ 1848 logop_head->oh_flags = flags; 1849 1850 /* 1851 * We've seen logs corrupted with bad transaction client 1852 * ids. This makes sure that XFS doesn't generate them on. 1853 * Turn this into an EIO and shut down the filesystem. 1854 */ 1855 switch (logop_head->oh_clientid) { 1856 case XFS_TRANSACTION: 1857 case XFS_VOLUME: 1858 case XFS_LOG: 1859 break; 1860 default: 1861 xfs_fs_cmn_err(CE_WARN, mp, 1862 "Bad XFS transaction clientid 0x%x in ticket 0x%p", 1863 logop_head->oh_clientid, tic); 1864 return XFS_ERROR(EIO); 1865 } 1866 1867 /* Partial write last time? => (partial_copy != 0) 1868 * need_copy is the amount we'd like to copy if everything could 1869 * fit in the current memcpy. 1870 */ 1871 need_copy = reg[index].i_len - partial_copy_len; 1872 1873 copy_off = partial_copy_len; 1874 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ 1875 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy); 1876 if (partial_copy) 1877 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); 1878 partial_copy_len = partial_copy = 0; 1879 } else { /* partial write */ 1880 copy_len = iclog->ic_size - log_offset; 1881 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len); 1882 logop_head->oh_flags |= XLOG_CONTINUE_TRANS; 1883 if (partial_copy) 1884 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; 1885 partial_copy_len += copy_len; 1886 partial_copy++; 1887 len += sizeof(xlog_op_header_t); /* from splitting of region */ 1888 /* account for new log op header */ 1889 ticket->t_curr_res -= sizeof(xlog_op_header_t); 1890 XLOG_TIC_ADD_OPHDR(ticket); 1891 } 1892 xlog_verify_dest_ptr(log, ptr); 1893 1894 /* copy region */ 1895 ASSERT(copy_len >= 0); 1896 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); 1897 xlog_write_adv_cnt(ptr, len, log_offset, copy_len); 1898 1899 /* make copy_len total bytes copied, including headers */ 1900 copy_len += start_rec_copy + sizeof(xlog_op_header_t); 1901 record_cnt++; 1902 data_cnt += contwr ? copy_len : 0; 1903 if (partial_copy) { /* copied partial region */ 1904 /* already marked WANT_SYNC by xlog_state_get_iclog_space */ 1905 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1906 record_cnt = data_cnt = 0; 1907 if ((error = xlog_state_release_iclog(log, iclog))) 1908 return error; 1909 break; /* don't increment index */ 1910 } else { /* copied entire region */ 1911 index++; 1912 partial_copy_len = partial_copy = 0; 1913 1914 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { 1915 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1916 record_cnt = data_cnt = 0; 1917 xlog_state_want_sync(log, iclog); 1918 if (commit_iclog) { 1919 ASSERT(flags & XLOG_COMMIT_TRANS); 1920 *commit_iclog = iclog; 1921 } else if ((error = xlog_state_release_iclog(log, iclog))) 1922 return error; 1923 if (index == nentries) 1924 return 0; /* we are done */ 1925 else 1926 break; 1927 } 1928 } /* if (partial_copy) */ 1929 } /* while (index < nentries) */ 1930 } /* for (index = 0; index < nentries; ) */ 1931 ASSERT(len == 0); 1932 1933 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1934 if (commit_iclog) { 1935 ASSERT(flags & XLOG_COMMIT_TRANS); 1936 *commit_iclog = iclog; 1937 return 0; 1938 } 1939 return xlog_state_release_iclog(log, iclog); 1940 } /* xlog_write */ 1941 1942 1943 /***************************************************************************** 1944 * 1945 * State Machine functions 1946 * 1947 ***************************************************************************** 1948 */ 1949 1950 /* Clean iclogs starting from the head. This ordering must be 1951 * maintained, so an iclog doesn't become ACTIVE beyond one that 1952 * is SYNCING. This is also required to maintain the notion that we use 1953 * a counting semaphore to hold off would be writers to the log when every 1954 * iclog is trying to sync to disk. 1955 * 1956 * State Change: DIRTY -> ACTIVE 1957 */ 1958 STATIC void 1959 xlog_state_clean_log(xlog_t *log) 1960 { 1961 xlog_in_core_t *iclog; 1962 int changed = 0; 1963 1964 iclog = log->l_iclog; 1965 do { 1966 if (iclog->ic_state == XLOG_STATE_DIRTY) { 1967 iclog->ic_state = XLOG_STATE_ACTIVE; 1968 iclog->ic_offset = 0; 1969 iclog->ic_callback = NULL; /* don't need to free */ 1970 /* 1971 * If the number of ops in this iclog indicate it just 1972 * contains the dummy transaction, we can 1973 * change state into IDLE (the second time around). 1974 * Otherwise we should change the state into 1975 * NEED a dummy. 1976 * We don't need to cover the dummy. 1977 */ 1978 if (!changed && 1979 (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) { 1980 changed = 1; 1981 } else { 1982 /* 1983 * We have two dirty iclogs so start over 1984 * This could also be num of ops indicates 1985 * this is not the dummy going out. 1986 */ 1987 changed = 2; 1988 } 1989 iclog->ic_header.h_num_logops = 0; 1990 memset(iclog->ic_header.h_cycle_data, 0, 1991 sizeof(iclog->ic_header.h_cycle_data)); 1992 iclog->ic_header.h_lsn = 0; 1993 } else if (iclog->ic_state == XLOG_STATE_ACTIVE) 1994 /* do nothing */; 1995 else 1996 break; /* stop cleaning */ 1997 iclog = iclog->ic_next; 1998 } while (iclog != log->l_iclog); 1999 2000 /* log is locked when we are called */ 2001 /* 2002 * Change state for the dummy log recording. 2003 * We usually go to NEED. But we go to NEED2 if the changed indicates 2004 * we are done writing the dummy record. 2005 * If we are done with the second dummy recored (DONE2), then 2006 * we go to IDLE. 2007 */ 2008 if (changed) { 2009 switch (log->l_covered_state) { 2010 case XLOG_STATE_COVER_IDLE: 2011 case XLOG_STATE_COVER_NEED: 2012 case XLOG_STATE_COVER_NEED2: 2013 log->l_covered_state = XLOG_STATE_COVER_NEED; 2014 break; 2015 2016 case XLOG_STATE_COVER_DONE: 2017 if (changed == 1) 2018 log->l_covered_state = XLOG_STATE_COVER_NEED2; 2019 else 2020 log->l_covered_state = XLOG_STATE_COVER_NEED; 2021 break; 2022 2023 case XLOG_STATE_COVER_DONE2: 2024 if (changed == 1) 2025 log->l_covered_state = XLOG_STATE_COVER_IDLE; 2026 else 2027 log->l_covered_state = XLOG_STATE_COVER_NEED; 2028 break; 2029 2030 default: 2031 ASSERT(0); 2032 } 2033 } 2034 } /* xlog_state_clean_log */ 2035 2036 STATIC xfs_lsn_t 2037 xlog_get_lowest_lsn( 2038 xlog_t *log) 2039 { 2040 xlog_in_core_t *lsn_log; 2041 xfs_lsn_t lowest_lsn, lsn; 2042 2043 lsn_log = log->l_iclog; 2044 lowest_lsn = 0; 2045 do { 2046 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { 2047 lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT); 2048 if ((lsn && !lowest_lsn) || 2049 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { 2050 lowest_lsn = lsn; 2051 } 2052 } 2053 lsn_log = lsn_log->ic_next; 2054 } while (lsn_log != log->l_iclog); 2055 return lowest_lsn; 2056 } 2057 2058 2059 STATIC void 2060 xlog_state_do_callback( 2061 xlog_t *log, 2062 int aborted, 2063 xlog_in_core_t *ciclog) 2064 { 2065 xlog_in_core_t *iclog; 2066 xlog_in_core_t *first_iclog; /* used to know when we've 2067 * processed all iclogs once */ 2068 xfs_log_callback_t *cb, *cb_next; 2069 int flushcnt = 0; 2070 xfs_lsn_t lowest_lsn; 2071 int ioerrors; /* counter: iclogs with errors */ 2072 int loopdidcallbacks; /* flag: inner loop did callbacks*/ 2073 int funcdidcallbacks; /* flag: function did callbacks */ 2074 int repeats; /* for issuing console warnings if 2075 * looping too many times */ 2076 SPLDECL(s); 2077 2078 s = LOG_LOCK(log); 2079 first_iclog = iclog = log->l_iclog; 2080 ioerrors = 0; 2081 funcdidcallbacks = 0; 2082 repeats = 0; 2083 2084 do { 2085 /* 2086 * Scan all iclogs starting with the one pointed to by the 2087 * log. Reset this starting point each time the log is 2088 * unlocked (during callbacks). 2089 * 2090 * Keep looping through iclogs until one full pass is made 2091 * without running any callbacks. 2092 */ 2093 first_iclog = log->l_iclog; 2094 iclog = log->l_iclog; 2095 loopdidcallbacks = 0; 2096 repeats++; 2097 2098 do { 2099 2100 /* skip all iclogs in the ACTIVE & DIRTY states */ 2101 if (iclog->ic_state & 2102 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { 2103 iclog = iclog->ic_next; 2104 continue; 2105 } 2106 2107 /* 2108 * Between marking a filesystem SHUTDOWN and stopping 2109 * the log, we do flush all iclogs to disk (if there 2110 * wasn't a log I/O error). So, we do want things to 2111 * go smoothly in case of just a SHUTDOWN w/o a 2112 * LOG_IO_ERROR. 2113 */ 2114 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 2115 /* 2116 * Can only perform callbacks in order. Since 2117 * this iclog is not in the DONE_SYNC/ 2118 * DO_CALLBACK state, we skip the rest and 2119 * just try to clean up. If we set our iclog 2120 * to DO_CALLBACK, we will not process it when 2121 * we retry since a previous iclog is in the 2122 * CALLBACK and the state cannot change since 2123 * we are holding the LOG_LOCK. 2124 */ 2125 if (!(iclog->ic_state & 2126 (XLOG_STATE_DONE_SYNC | 2127 XLOG_STATE_DO_CALLBACK))) { 2128 if (ciclog && (ciclog->ic_state == 2129 XLOG_STATE_DONE_SYNC)) { 2130 ciclog->ic_state = XLOG_STATE_DO_CALLBACK; 2131 } 2132 break; 2133 } 2134 /* 2135 * We now have an iclog that is in either the 2136 * DO_CALLBACK or DONE_SYNC states. The other 2137 * states (WANT_SYNC, SYNCING, or CALLBACK were 2138 * caught by the above if and are going to 2139 * clean (i.e. we aren't doing their callbacks) 2140 * see the above if. 2141 */ 2142 2143 /* 2144 * We will do one more check here to see if we 2145 * have chased our tail around. 2146 */ 2147 2148 lowest_lsn = xlog_get_lowest_lsn(log); 2149 if (lowest_lsn && ( 2150 XFS_LSN_CMP( 2151 lowest_lsn, 2152 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2153 )<0)) { 2154 iclog = iclog->ic_next; 2155 continue; /* Leave this iclog for 2156 * another thread */ 2157 } 2158 2159 iclog->ic_state = XLOG_STATE_CALLBACK; 2160 2161 LOG_UNLOCK(log, s); 2162 2163 /* l_last_sync_lsn field protected by 2164 * GRANT_LOCK. Don't worry about iclog's lsn. 2165 * No one else can be here except us. 2166 */ 2167 s = GRANT_LOCK(log); 2168 ASSERT(XFS_LSN_CMP( 2169 log->l_last_sync_lsn, 2170 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2171 )<=0); 2172 log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2173 GRANT_UNLOCK(log, s); 2174 2175 /* 2176 * Keep processing entries in the callback list 2177 * until we come around and it is empty. We 2178 * need to atomically see that the list is 2179 * empty and change the state to DIRTY so that 2180 * we don't miss any more callbacks being added. 2181 */ 2182 s = LOG_LOCK(log); 2183 } else { 2184 ioerrors++; 2185 } 2186 cb = iclog->ic_callback; 2187 2188 while (cb) { 2189 iclog->ic_callback_tail = &(iclog->ic_callback); 2190 iclog->ic_callback = NULL; 2191 LOG_UNLOCK(log, s); 2192 2193 /* perform callbacks in the order given */ 2194 for (; cb; cb = cb_next) { 2195 cb_next = cb->cb_next; 2196 cb->cb_func(cb->cb_arg, aborted); 2197 } 2198 s = LOG_LOCK(log); 2199 cb = iclog->ic_callback; 2200 } 2201 2202 loopdidcallbacks++; 2203 funcdidcallbacks++; 2204 2205 ASSERT(iclog->ic_callback == NULL); 2206 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) 2207 iclog->ic_state = XLOG_STATE_DIRTY; 2208 2209 /* 2210 * Transition from DIRTY to ACTIVE if applicable. 2211 * NOP if STATE_IOERROR. 2212 */ 2213 xlog_state_clean_log(log); 2214 2215 /* wake up threads waiting in xfs_log_force() */ 2216 sv_broadcast(&iclog->ic_forcesema); 2217 2218 iclog = iclog->ic_next; 2219 } while (first_iclog != iclog); 2220 2221 if (repeats > 5000) { 2222 flushcnt += repeats; 2223 repeats = 0; 2224 xfs_fs_cmn_err(CE_WARN, log->l_mp, 2225 "%s: possible infinite loop (%d iterations)", 2226 __FUNCTION__, flushcnt); 2227 } 2228 } while (!ioerrors && loopdidcallbacks); 2229 2230 /* 2231 * make one last gasp attempt to see if iclogs are being left in 2232 * limbo.. 2233 */ 2234 #ifdef DEBUG 2235 if (funcdidcallbacks) { 2236 first_iclog = iclog = log->l_iclog; 2237 do { 2238 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); 2239 /* 2240 * Terminate the loop if iclogs are found in states 2241 * which will cause other threads to clean up iclogs. 2242 * 2243 * SYNCING - i/o completion will go through logs 2244 * DONE_SYNC - interrupt thread should be waiting for 2245 * LOG_LOCK 2246 * IOERROR - give up hope all ye who enter here 2247 */ 2248 if (iclog->ic_state == XLOG_STATE_WANT_SYNC || 2249 iclog->ic_state == XLOG_STATE_SYNCING || 2250 iclog->ic_state == XLOG_STATE_DONE_SYNC || 2251 iclog->ic_state == XLOG_STATE_IOERROR ) 2252 break; 2253 iclog = iclog->ic_next; 2254 } while (first_iclog != iclog); 2255 } 2256 #endif 2257 2258 flushcnt = 0; 2259 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { 2260 flushcnt = log->l_flushcnt; 2261 log->l_flushcnt = 0; 2262 } 2263 LOG_UNLOCK(log, s); 2264 while (flushcnt--) 2265 vsema(&log->l_flushsema); 2266 } /* xlog_state_do_callback */ 2267 2268 2269 /* 2270 * Finish transitioning this iclog to the dirty state. 2271 * 2272 * Make sure that we completely execute this routine only when this is 2273 * the last call to the iclog. There is a good chance that iclog flushes, 2274 * when we reach the end of the physical log, get turned into 2 separate 2275 * calls to bwrite. Hence, one iclog flush could generate two calls to this 2276 * routine. By using the reference count bwritecnt, we guarantee that only 2277 * the second completion goes through. 2278 * 2279 * Callbacks could take time, so they are done outside the scope of the 2280 * global state machine log lock. Assume that the calls to cvsema won't 2281 * take a long time. At least we know it won't sleep. 2282 */ 2283 void 2284 xlog_state_done_syncing( 2285 xlog_in_core_t *iclog, 2286 int aborted) 2287 { 2288 xlog_t *log = iclog->ic_log; 2289 SPLDECL(s); 2290 2291 s = LOG_LOCK(log); 2292 2293 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || 2294 iclog->ic_state == XLOG_STATE_IOERROR); 2295 ASSERT(iclog->ic_refcnt == 0); 2296 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); 2297 2298 2299 /* 2300 * If we got an error, either on the first buffer, or in the case of 2301 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, 2302 * and none should ever be attempted to be written to disk 2303 * again. 2304 */ 2305 if (iclog->ic_state != XLOG_STATE_IOERROR) { 2306 if (--iclog->ic_bwritecnt == 1) { 2307 LOG_UNLOCK(log, s); 2308 return; 2309 } 2310 iclog->ic_state = XLOG_STATE_DONE_SYNC; 2311 } 2312 2313 /* 2314 * Someone could be sleeping prior to writing out the next 2315 * iclog buffer, we wake them all, one will get to do the 2316 * I/O, the others get to wait for the result. 2317 */ 2318 sv_broadcast(&iclog->ic_writesema); 2319 LOG_UNLOCK(log, s); 2320 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ 2321 } /* xlog_state_done_syncing */ 2322 2323 2324 /* 2325 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must 2326 * sleep. The flush semaphore is set to the number of in-core buffers and 2327 * decremented around disk syncing. Therefore, if all buffers are syncing, 2328 * this semaphore will cause new writes to sleep until a sync completes. 2329 * Otherwise, this code just does p() followed by v(). This approximates 2330 * a sleep/wakeup except we can't race. 2331 * 2332 * The in-core logs are used in a circular fashion. They are not used 2333 * out-of-order even when an iclog past the head is free. 2334 * 2335 * return: 2336 * * log_offset where xlog_write() can start writing into the in-core 2337 * log's data space. 2338 * * in-core log pointer to which xlog_write() should write. 2339 * * boolean indicating this is a continued write to an in-core log. 2340 * If this is the last write, then the in-core log's offset field 2341 * needs to be incremented, depending on the amount of data which 2342 * is copied. 2343 */ 2344 int 2345 xlog_state_get_iclog_space(xlog_t *log, 2346 int len, 2347 xlog_in_core_t **iclogp, 2348 xlog_ticket_t *ticket, 2349 int *continued_write, 2350 int *logoffsetp) 2351 { 2352 SPLDECL(s); 2353 int log_offset; 2354 xlog_rec_header_t *head; 2355 xlog_in_core_t *iclog; 2356 int error; 2357 2358 restart: 2359 s = LOG_LOCK(log); 2360 if (XLOG_FORCED_SHUTDOWN(log)) { 2361 LOG_UNLOCK(log, s); 2362 return XFS_ERROR(EIO); 2363 } 2364 2365 iclog = log->l_iclog; 2366 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { 2367 log->l_flushcnt++; 2368 LOG_UNLOCK(log, s); 2369 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); 2370 XFS_STATS_INC(xs_log_noiclogs); 2371 /* Ensure that log writes happen */ 2372 psema(&log->l_flushsema, PINOD); 2373 goto restart; 2374 } 2375 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2376 head = &iclog->ic_header; 2377 2378 iclog->ic_refcnt++; /* prevents sync */ 2379 log_offset = iclog->ic_offset; 2380 2381 /* On the 1st write to an iclog, figure out lsn. This works 2382 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are 2383 * committing to. If the offset is set, that's how many blocks 2384 * must be written. 2385 */ 2386 if (log_offset == 0) { 2387 ticket->t_curr_res -= log->l_iclog_hsize; 2388 XLOG_TIC_ADD_REGION(ticket, 2389 log->l_iclog_hsize, 2390 XLOG_REG_TYPE_LRHEADER); 2391 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle); 2392 ASSIGN_LSN(head->h_lsn, log); 2393 ASSERT(log->l_curr_block >= 0); 2394 } 2395 2396 /* If there is enough room to write everything, then do it. Otherwise, 2397 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC 2398 * bit is on, so this will get flushed out. Don't update ic_offset 2399 * until you know exactly how many bytes get copied. Therefore, wait 2400 * until later to update ic_offset. 2401 * 2402 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's 2403 * can fit into remaining data section. 2404 */ 2405 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { 2406 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2407 2408 /* If I'm the only one writing to this iclog, sync it to disk */ 2409 if (iclog->ic_refcnt == 1) { 2410 LOG_UNLOCK(log, s); 2411 if ((error = xlog_state_release_iclog(log, iclog))) 2412 return error; 2413 } else { 2414 iclog->ic_refcnt--; 2415 LOG_UNLOCK(log, s); 2416 } 2417 goto restart; 2418 } 2419 2420 /* Do we have enough room to write the full amount in the remainder 2421 * of this iclog? Or must we continue a write on the next iclog and 2422 * mark this iclog as completely taken? In the case where we switch 2423 * iclogs (to mark it taken), this particular iclog will release/sync 2424 * to disk in xlog_write(). 2425 */ 2426 if (len <= iclog->ic_size - iclog->ic_offset) { 2427 *continued_write = 0; 2428 iclog->ic_offset += len; 2429 } else { 2430 *continued_write = 1; 2431 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2432 } 2433 *iclogp = iclog; 2434 2435 ASSERT(iclog->ic_offset <= iclog->ic_size); 2436 LOG_UNLOCK(log, s); 2437 2438 *logoffsetp = log_offset; 2439 return 0; 2440 } /* xlog_state_get_iclog_space */ 2441 2442 /* 2443 * Atomically get the log space required for a log ticket. 2444 * 2445 * Once a ticket gets put onto the reserveq, it will only return after 2446 * the needed reservation is satisfied. 2447 */ 2448 STATIC int 2449 xlog_grant_log_space(xlog_t *log, 2450 xlog_ticket_t *tic) 2451 { 2452 int free_bytes; 2453 int need_bytes; 2454 SPLDECL(s); 2455 #ifdef DEBUG 2456 xfs_lsn_t tail_lsn; 2457 #endif 2458 2459 2460 #ifdef DEBUG 2461 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2462 panic("grant Recovery problem"); 2463 #endif 2464 2465 /* Is there space or do we need to sleep? */ 2466 s = GRANT_LOCK(log); 2467 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); 2468 2469 /* something is already sleeping; insert new transaction at end */ 2470 if (log->l_reserve_headq) { 2471 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2472 xlog_trace_loggrant(log, tic, 2473 "xlog_grant_log_space: sleep 1"); 2474 /* 2475 * Gotta check this before going to sleep, while we're 2476 * holding the grant lock. 2477 */ 2478 if (XLOG_FORCED_SHUTDOWN(log)) 2479 goto error_return; 2480 2481 XFS_STATS_INC(xs_sleep_logspace); 2482 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2483 /* 2484 * If we got an error, and the filesystem is shutting down, 2485 * we'll catch it down below. So just continue... 2486 */ 2487 xlog_trace_loggrant(log, tic, 2488 "xlog_grant_log_space: wake 1"); 2489 s = GRANT_LOCK(log); 2490 } 2491 if (tic->t_flags & XFS_LOG_PERM_RESERV) 2492 need_bytes = tic->t_unit_res*tic->t_ocnt; 2493 else 2494 need_bytes = tic->t_unit_res; 2495 2496 redo: 2497 if (XLOG_FORCED_SHUTDOWN(log)) 2498 goto error_return; 2499 2500 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, 2501 log->l_grant_reserve_bytes); 2502 if (free_bytes < need_bytes) { 2503 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2504 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2505 xlog_trace_loggrant(log, tic, 2506 "xlog_grant_log_space: sleep 2"); 2507 XFS_STATS_INC(xs_sleep_logspace); 2508 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2509 2510 if (XLOG_FORCED_SHUTDOWN(log)) { 2511 s = GRANT_LOCK(log); 2512 goto error_return; 2513 } 2514 2515 xlog_trace_loggrant(log, tic, 2516 "xlog_grant_log_space: wake 2"); 2517 xlog_grant_push_ail(log->l_mp, need_bytes); 2518 s = GRANT_LOCK(log); 2519 goto redo; 2520 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2521 xlog_del_ticketq(&log->l_reserve_headq, tic); 2522 2523 /* we've got enough space */ 2524 xlog_grant_add_space(log, need_bytes); 2525 #ifdef DEBUG 2526 tail_lsn = log->l_tail_lsn; 2527 /* 2528 * Check to make sure the grant write head didn't just over lap the 2529 * tail. If the cycles are the same, we can't be overlapping. 2530 * Otherwise, make sure that the cycles differ by exactly one and 2531 * check the byte count. 2532 */ 2533 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2534 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2535 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2536 } 2537 #endif 2538 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); 2539 xlog_verify_grant_head(log, 1); 2540 GRANT_UNLOCK(log, s); 2541 return 0; 2542 2543 error_return: 2544 if (tic->t_flags & XLOG_TIC_IN_Q) 2545 xlog_del_ticketq(&log->l_reserve_headq, tic); 2546 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); 2547 /* 2548 * If we are failing, make sure the ticket doesn't have any 2549 * current reservations. We don't want to add this back when 2550 * the ticket/transaction gets cancelled. 2551 */ 2552 tic->t_curr_res = 0; 2553 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2554 GRANT_UNLOCK(log, s); 2555 return XFS_ERROR(EIO); 2556 } /* xlog_grant_log_space */ 2557 2558 2559 /* 2560 * Replenish the byte reservation required by moving the grant write head. 2561 * 2562 * 2563 */ 2564 STATIC int 2565 xlog_regrant_write_log_space(xlog_t *log, 2566 xlog_ticket_t *tic) 2567 { 2568 SPLDECL(s); 2569 int free_bytes, need_bytes; 2570 xlog_ticket_t *ntic; 2571 #ifdef DEBUG 2572 xfs_lsn_t tail_lsn; 2573 #endif 2574 2575 tic->t_curr_res = tic->t_unit_res; 2576 XLOG_TIC_RESET_RES(tic); 2577 2578 if (tic->t_cnt > 0) 2579 return 0; 2580 2581 #ifdef DEBUG 2582 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2583 panic("regrant Recovery problem"); 2584 #endif 2585 2586 s = GRANT_LOCK(log); 2587 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); 2588 2589 if (XLOG_FORCED_SHUTDOWN(log)) 2590 goto error_return; 2591 2592 /* If there are other waiters on the queue then give them a 2593 * chance at logspace before us. Wake up the first waiters, 2594 * if we do not wake up all the waiters then go to sleep waiting 2595 * for more free space, otherwise try to get some space for 2596 * this transaction. 2597 */ 2598 2599 if ((ntic = log->l_write_headq)) { 2600 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2601 log->l_grant_write_bytes); 2602 do { 2603 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); 2604 2605 if (free_bytes < ntic->t_unit_res) 2606 break; 2607 free_bytes -= ntic->t_unit_res; 2608 sv_signal(&ntic->t_sema); 2609 ntic = ntic->t_next; 2610 } while (ntic != log->l_write_headq); 2611 2612 if (ntic != log->l_write_headq) { 2613 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2614 xlog_ins_ticketq(&log->l_write_headq, tic); 2615 2616 xlog_trace_loggrant(log, tic, 2617 "xlog_regrant_write_log_space: sleep 1"); 2618 XFS_STATS_INC(xs_sleep_logspace); 2619 sv_wait(&tic->t_sema, PINOD|PLTWAIT, 2620 &log->l_grant_lock, s); 2621 2622 /* If we're shutting down, this tic is already 2623 * off the queue */ 2624 if (XLOG_FORCED_SHUTDOWN(log)) { 2625 s = GRANT_LOCK(log); 2626 goto error_return; 2627 } 2628 2629 xlog_trace_loggrant(log, tic, 2630 "xlog_regrant_write_log_space: wake 1"); 2631 xlog_grant_push_ail(log->l_mp, tic->t_unit_res); 2632 s = GRANT_LOCK(log); 2633 } 2634 } 2635 2636 need_bytes = tic->t_unit_res; 2637 2638 redo: 2639 if (XLOG_FORCED_SHUTDOWN(log)) 2640 goto error_return; 2641 2642 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2643 log->l_grant_write_bytes); 2644 if (free_bytes < need_bytes) { 2645 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2646 xlog_ins_ticketq(&log->l_write_headq, tic); 2647 XFS_STATS_INC(xs_sleep_logspace); 2648 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2649 2650 /* If we're shutting down, this tic is already off the queue */ 2651 if (XLOG_FORCED_SHUTDOWN(log)) { 2652 s = GRANT_LOCK(log); 2653 goto error_return; 2654 } 2655 2656 xlog_trace_loggrant(log, tic, 2657 "xlog_regrant_write_log_space: wake 2"); 2658 xlog_grant_push_ail(log->l_mp, need_bytes); 2659 s = GRANT_LOCK(log); 2660 goto redo; 2661 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2662 xlog_del_ticketq(&log->l_write_headq, tic); 2663 2664 /* we've got enough space */ 2665 xlog_grant_add_space_write(log, need_bytes); 2666 #ifdef DEBUG 2667 tail_lsn = log->l_tail_lsn; 2668 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2669 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2670 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2671 } 2672 #endif 2673 2674 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); 2675 xlog_verify_grant_head(log, 1); 2676 GRANT_UNLOCK(log, s); 2677 return 0; 2678 2679 2680 error_return: 2681 if (tic->t_flags & XLOG_TIC_IN_Q) 2682 xlog_del_ticketq(&log->l_reserve_headq, tic); 2683 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); 2684 /* 2685 * If we are failing, make sure the ticket doesn't have any 2686 * current reservations. We don't want to add this back when 2687 * the ticket/transaction gets cancelled. 2688 */ 2689 tic->t_curr_res = 0; 2690 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2691 GRANT_UNLOCK(log, s); 2692 return XFS_ERROR(EIO); 2693 } /* xlog_regrant_write_log_space */ 2694 2695 2696 /* The first cnt-1 times through here we don't need to 2697 * move the grant write head because the permanent 2698 * reservation has reserved cnt times the unit amount. 2699 * Release part of current permanent unit reservation and 2700 * reset current reservation to be one units worth. Also 2701 * move grant reservation head forward. 2702 */ 2703 STATIC void 2704 xlog_regrant_reserve_log_space(xlog_t *log, 2705 xlog_ticket_t *ticket) 2706 { 2707 SPLDECL(s); 2708 2709 xlog_trace_loggrant(log, ticket, 2710 "xlog_regrant_reserve_log_space: enter"); 2711 if (ticket->t_cnt > 0) 2712 ticket->t_cnt--; 2713 2714 s = GRANT_LOCK(log); 2715 xlog_grant_sub_space(log, ticket->t_curr_res); 2716 ticket->t_curr_res = ticket->t_unit_res; 2717 XLOG_TIC_RESET_RES(ticket); 2718 xlog_trace_loggrant(log, ticket, 2719 "xlog_regrant_reserve_log_space: sub current res"); 2720 xlog_verify_grant_head(log, 1); 2721 2722 /* just return if we still have some of the pre-reserved space */ 2723 if (ticket->t_cnt > 0) { 2724 GRANT_UNLOCK(log, s); 2725 return; 2726 } 2727 2728 xlog_grant_add_space_reserve(log, ticket->t_unit_res); 2729 xlog_trace_loggrant(log, ticket, 2730 "xlog_regrant_reserve_log_space: exit"); 2731 xlog_verify_grant_head(log, 0); 2732 GRANT_UNLOCK(log, s); 2733 ticket->t_curr_res = ticket->t_unit_res; 2734 XLOG_TIC_RESET_RES(ticket); 2735 } /* xlog_regrant_reserve_log_space */ 2736 2737 2738 /* 2739 * Give back the space left from a reservation. 2740 * 2741 * All the information we need to make a correct determination of space left 2742 * is present. For non-permanent reservations, things are quite easy. The 2743 * count should have been decremented to zero. We only need to deal with the 2744 * space remaining in the current reservation part of the ticket. If the 2745 * ticket contains a permanent reservation, there may be left over space which 2746 * needs to be released. A count of N means that N-1 refills of the current 2747 * reservation can be done before we need to ask for more space. The first 2748 * one goes to fill up the first current reservation. Once we run out of 2749 * space, the count will stay at zero and the only space remaining will be 2750 * in the current reservation field. 2751 */ 2752 STATIC void 2753 xlog_ungrant_log_space(xlog_t *log, 2754 xlog_ticket_t *ticket) 2755 { 2756 SPLDECL(s); 2757 2758 if (ticket->t_cnt > 0) 2759 ticket->t_cnt--; 2760 2761 s = GRANT_LOCK(log); 2762 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); 2763 2764 xlog_grant_sub_space(log, ticket->t_curr_res); 2765 2766 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); 2767 2768 /* If this is a permanent reservation ticket, we may be able to free 2769 * up more space based on the remaining count. 2770 */ 2771 if (ticket->t_cnt > 0) { 2772 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); 2773 xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); 2774 } 2775 2776 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); 2777 xlog_verify_grant_head(log, 1); 2778 GRANT_UNLOCK(log, s); 2779 xfs_log_move_tail(log->l_mp, 1); 2780 } /* xlog_ungrant_log_space */ 2781 2782 2783 /* 2784 * Atomically put back used ticket. 2785 */ 2786 void 2787 xlog_state_put_ticket(xlog_t *log, 2788 xlog_ticket_t *tic) 2789 { 2790 unsigned long s; 2791 2792 s = LOG_LOCK(log); 2793 xlog_ticket_put(log, tic); 2794 LOG_UNLOCK(log, s); 2795 } /* xlog_state_put_ticket */ 2796 2797 /* 2798 * Flush iclog to disk if this is the last reference to the given iclog and 2799 * the WANT_SYNC bit is set. 2800 * 2801 * When this function is entered, the iclog is not necessarily in the 2802 * WANT_SYNC state. It may be sitting around waiting to get filled. 2803 * 2804 * 2805 */ 2806 int 2807 xlog_state_release_iclog(xlog_t *log, 2808 xlog_in_core_t *iclog) 2809 { 2810 SPLDECL(s); 2811 int sync = 0; /* do we sync? */ 2812 2813 xlog_assign_tail_lsn(log->l_mp); 2814 2815 s = LOG_LOCK(log); 2816 2817 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2818 LOG_UNLOCK(log, s); 2819 return XFS_ERROR(EIO); 2820 } 2821 2822 ASSERT(iclog->ic_refcnt > 0); 2823 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || 2824 iclog->ic_state == XLOG_STATE_WANT_SYNC); 2825 2826 if (--iclog->ic_refcnt == 0 && 2827 iclog->ic_state == XLOG_STATE_WANT_SYNC) { 2828 sync++; 2829 iclog->ic_state = XLOG_STATE_SYNCING; 2830 INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn); 2831 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); 2832 /* cycle incremented when incrementing curr_block */ 2833 } 2834 2835 LOG_UNLOCK(log, s); 2836 2837 /* 2838 * We let the log lock go, so it's possible that we hit a log I/O 2839 * error or some other SHUTDOWN condition that marks the iclog 2840 * as XLOG_STATE_IOERROR before the bwrite. However, we know that 2841 * this iclog has consistent data, so we ignore IOERROR 2842 * flags after this point. 2843 */ 2844 if (sync) { 2845 return xlog_sync(log, iclog); 2846 } 2847 return 0; 2848 2849 } /* xlog_state_release_iclog */ 2850 2851 2852 /* 2853 * This routine will mark the current iclog in the ring as WANT_SYNC 2854 * and move the current iclog pointer to the next iclog in the ring. 2855 * When this routine is called from xlog_state_get_iclog_space(), the 2856 * exact size of the iclog has not yet been determined. All we know is 2857 * that every data block. We have run out of space in this log record. 2858 */ 2859 STATIC void 2860 xlog_state_switch_iclogs(xlog_t *log, 2861 xlog_in_core_t *iclog, 2862 int eventual_size) 2863 { 2864 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2865 if (!eventual_size) 2866 eventual_size = iclog->ic_offset; 2867 iclog->ic_state = XLOG_STATE_WANT_SYNC; 2868 INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block); 2869 log->l_prev_block = log->l_curr_block; 2870 log->l_prev_cycle = log->l_curr_cycle; 2871 2872 /* roll log?: ic_offset changed later */ 2873 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); 2874 2875 /* Round up to next log-sunit */ 2876 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 2877 log->l_mp->m_sb.sb_logsunit > 1) { 2878 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); 2879 log->l_curr_block = roundup(log->l_curr_block, sunit_bb); 2880 } 2881 2882 if (log->l_curr_block >= log->l_logBBsize) { 2883 log->l_curr_cycle++; 2884 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) 2885 log->l_curr_cycle++; 2886 log->l_curr_block -= log->l_logBBsize; 2887 ASSERT(log->l_curr_block >= 0); 2888 } 2889 ASSERT(iclog == log->l_iclog); 2890 log->l_iclog = iclog->ic_next; 2891 } /* xlog_state_switch_iclogs */ 2892 2893 2894 /* 2895 * Write out all data in the in-core log as of this exact moment in time. 2896 * 2897 * Data may be written to the in-core log during this call. However, 2898 * we don't guarantee this data will be written out. A change from past 2899 * implementation means this routine will *not* write out zero length LRs. 2900 * 2901 * Basically, we try and perform an intelligent scan of the in-core logs. 2902 * If we determine there is no flushable data, we just return. There is no 2903 * flushable data if: 2904 * 2905 * 1. the current iclog is active and has no data; the previous iclog 2906 * is in the active or dirty state. 2907 * 2. the current iclog is drity, and the previous iclog is in the 2908 * active or dirty state. 2909 * 2910 * We may sleep (call psema) if: 2911 * 2912 * 1. the current iclog is not in the active nor dirty state. 2913 * 2. the current iclog dirty, and the previous iclog is not in the 2914 * active nor dirty state. 2915 * 3. the current iclog is active, and there is another thread writing 2916 * to this particular iclog. 2917 * 4. a) the current iclog is active and has no other writers 2918 * b) when we return from flushing out this iclog, it is still 2919 * not in the active nor dirty state. 2920 */ 2921 STATIC int 2922 xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed) 2923 { 2924 xlog_in_core_t *iclog; 2925 xfs_lsn_t lsn; 2926 SPLDECL(s); 2927 2928 s = LOG_LOCK(log); 2929 2930 iclog = log->l_iclog; 2931 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2932 LOG_UNLOCK(log, s); 2933 return XFS_ERROR(EIO); 2934 } 2935 2936 /* If the head iclog is not active nor dirty, we just attach 2937 * ourselves to the head and go to sleep. 2938 */ 2939 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2940 iclog->ic_state == XLOG_STATE_DIRTY) { 2941 /* 2942 * If the head is dirty or (active and empty), then 2943 * we need to look at the previous iclog. If the previous 2944 * iclog is active or dirty we are done. There is nothing 2945 * to sync out. Otherwise, we attach ourselves to the 2946 * previous iclog and go to sleep. 2947 */ 2948 if (iclog->ic_state == XLOG_STATE_DIRTY || 2949 (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) { 2950 iclog = iclog->ic_prev; 2951 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2952 iclog->ic_state == XLOG_STATE_DIRTY) 2953 goto no_sleep; 2954 else 2955 goto maybe_sleep; 2956 } else { 2957 if (iclog->ic_refcnt == 0) { 2958 /* We are the only one with access to this 2959 * iclog. Flush it out now. There should 2960 * be a roundoff of zero to show that someone 2961 * has already taken care of the roundoff from 2962 * the previous sync. 2963 */ 2964 iclog->ic_refcnt++; 2965 lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2966 xlog_state_switch_iclogs(log, iclog, 0); 2967 LOG_UNLOCK(log, s); 2968 2969 if (xlog_state_release_iclog(log, iclog)) 2970 return XFS_ERROR(EIO); 2971 *log_flushed = 1; 2972 s = LOG_LOCK(log); 2973 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn && 2974 iclog->ic_state != XLOG_STATE_DIRTY) 2975 goto maybe_sleep; 2976 else 2977 goto no_sleep; 2978 } else { 2979 /* Someone else is writing to this iclog. 2980 * Use its call to flush out the data. However, 2981 * the other thread may not force out this LR, 2982 * so we mark it WANT_SYNC. 2983 */ 2984 xlog_state_switch_iclogs(log, iclog, 0); 2985 goto maybe_sleep; 2986 } 2987 } 2988 } 2989 2990 /* By the time we come around again, the iclog could've been filled 2991 * which would give it another lsn. If we have a new lsn, just 2992 * return because the relevant data has been flushed. 2993 */ 2994 maybe_sleep: 2995 if (flags & XFS_LOG_SYNC) { 2996 /* 2997 * We must check if we're shutting down here, before 2998 * we wait, while we're holding the LOG_LOCK. 2999 * Then we check again after waking up, in case our 3000 * sleep was disturbed by a bad news. 3001 */ 3002 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3003 LOG_UNLOCK(log, s); 3004 return XFS_ERROR(EIO); 3005 } 3006 XFS_STATS_INC(xs_log_force_sleep); 3007 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s); 3008 /* 3009 * No need to grab the log lock here since we're 3010 * only deciding whether or not to return EIO 3011 * and the memory read should be atomic. 3012 */ 3013 if (iclog->ic_state & XLOG_STATE_IOERROR) 3014 return XFS_ERROR(EIO); 3015 *log_flushed = 1; 3016 3017 } else { 3018 3019 no_sleep: 3020 LOG_UNLOCK(log, s); 3021 } 3022 return 0; 3023 } /* xlog_state_sync_all */ 3024 3025 3026 /* 3027 * Used by code which implements synchronous log forces. 3028 * 3029 * Find in-core log with lsn. 3030 * If it is in the DIRTY state, just return. 3031 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC 3032 * state and go to sleep or return. 3033 * If it is in any other state, go to sleep or return. 3034 * 3035 * If filesystem activity goes to zero, the iclog will get flushed only by 3036 * bdflush(). 3037 */ 3038 int 3039 xlog_state_sync(xlog_t *log, 3040 xfs_lsn_t lsn, 3041 uint flags, 3042 int *log_flushed) 3043 { 3044 xlog_in_core_t *iclog; 3045 int already_slept = 0; 3046 SPLDECL(s); 3047 3048 3049 try_again: 3050 s = LOG_LOCK(log); 3051 iclog = log->l_iclog; 3052 3053 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3054 LOG_UNLOCK(log, s); 3055 return XFS_ERROR(EIO); 3056 } 3057 3058 do { 3059 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) { 3060 iclog = iclog->ic_next; 3061 continue; 3062 } 3063 3064 if (iclog->ic_state == XLOG_STATE_DIRTY) { 3065 LOG_UNLOCK(log, s); 3066 return 0; 3067 } 3068 3069 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3070 /* 3071 * We sleep here if we haven't already slept (e.g. 3072 * this is the first time we've looked at the correct 3073 * iclog buf) and the buffer before us is going to 3074 * be sync'ed. The reason for this is that if we 3075 * are doing sync transactions here, by waiting for 3076 * the previous I/O to complete, we can allow a few 3077 * more transactions into this iclog before we close 3078 * it down. 3079 * 3080 * Otherwise, we mark the buffer WANT_SYNC, and bump 3081 * up the refcnt so we can release the log (which drops 3082 * the ref count). The state switch keeps new transaction 3083 * commits from using this buffer. When the current commits 3084 * finish writing into the buffer, the refcount will drop to 3085 * zero and the buffer will go out then. 3086 */ 3087 if (!already_slept && 3088 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | 3089 XLOG_STATE_SYNCING))) { 3090 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); 3091 XFS_STATS_INC(xs_log_force_sleep); 3092 sv_wait(&iclog->ic_prev->ic_writesema, PSWP, 3093 &log->l_icloglock, s); 3094 *log_flushed = 1; 3095 already_slept = 1; 3096 goto try_again; 3097 } else { 3098 iclog->ic_refcnt++; 3099 xlog_state_switch_iclogs(log, iclog, 0); 3100 LOG_UNLOCK(log, s); 3101 if (xlog_state_release_iclog(log, iclog)) 3102 return XFS_ERROR(EIO); 3103 *log_flushed = 1; 3104 s = LOG_LOCK(log); 3105 } 3106 } 3107 3108 if ((flags & XFS_LOG_SYNC) && /* sleep */ 3109 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { 3110 3111 /* 3112 * Don't wait on the forcesema if we know that we've 3113 * gotten a log write error. 3114 */ 3115 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3116 LOG_UNLOCK(log, s); 3117 return XFS_ERROR(EIO); 3118 } 3119 XFS_STATS_INC(xs_log_force_sleep); 3120 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s); 3121 /* 3122 * No need to grab the log lock here since we're 3123 * only deciding whether or not to return EIO 3124 * and the memory read should be atomic. 3125 */ 3126 if (iclog->ic_state & XLOG_STATE_IOERROR) 3127 return XFS_ERROR(EIO); 3128 *log_flushed = 1; 3129 } else { /* just return */ 3130 LOG_UNLOCK(log, s); 3131 } 3132 return 0; 3133 3134 } while (iclog != log->l_iclog); 3135 3136 LOG_UNLOCK(log, s); 3137 return 0; 3138 } /* xlog_state_sync */ 3139 3140 3141 /* 3142 * Called when we want to mark the current iclog as being ready to sync to 3143 * disk. 3144 */ 3145 void 3146 xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) 3147 { 3148 SPLDECL(s); 3149 3150 s = LOG_LOCK(log); 3151 3152 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3153 xlog_state_switch_iclogs(log, iclog, 0); 3154 } else { 3155 ASSERT(iclog->ic_state & 3156 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); 3157 } 3158 3159 LOG_UNLOCK(log, s); 3160 } /* xlog_state_want_sync */ 3161 3162 3163 3164 /***************************************************************************** 3165 * 3166 * TICKET functions 3167 * 3168 ***************************************************************************** 3169 */ 3170 3171 /* 3172 * Algorithm doesn't take into account page size. ;-( 3173 */ 3174 STATIC void 3175 xlog_state_ticket_alloc(xlog_t *log) 3176 { 3177 xlog_ticket_t *t_list; 3178 xlog_ticket_t *next; 3179 xfs_caddr_t buf; 3180 uint i = (NBPP / sizeof(xlog_ticket_t)) - 2; 3181 SPLDECL(s); 3182 3183 /* 3184 * The kmem_zalloc may sleep, so we shouldn't be holding the 3185 * global lock. XXXmiken: may want to use zone allocator. 3186 */ 3187 buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP); 3188 3189 s = LOG_LOCK(log); 3190 3191 /* Attach 1st ticket to Q, so we can keep track of allocated memory */ 3192 t_list = (xlog_ticket_t *)buf; 3193 t_list->t_next = log->l_unmount_free; 3194 log->l_unmount_free = t_list++; 3195 log->l_ticket_cnt++; 3196 log->l_ticket_tcnt++; 3197 3198 /* Next ticket becomes first ticket attached to ticket free list */ 3199 if (log->l_freelist != NULL) { 3200 ASSERT(log->l_tail != NULL); 3201 log->l_tail->t_next = t_list; 3202 } else { 3203 log->l_freelist = t_list; 3204 } 3205 log->l_ticket_cnt++; 3206 log->l_ticket_tcnt++; 3207 3208 /* Cycle through rest of alloc'ed memory, building up free Q */ 3209 for ( ; i > 0; i--) { 3210 next = t_list + 1; 3211 t_list->t_next = next; 3212 t_list = next; 3213 log->l_ticket_cnt++; 3214 log->l_ticket_tcnt++; 3215 } 3216 t_list->t_next = NULL; 3217 log->l_tail = t_list; 3218 LOG_UNLOCK(log, s); 3219 } /* xlog_state_ticket_alloc */ 3220 3221 3222 /* 3223 * Put ticket into free list 3224 * 3225 * Assumption: log lock is held around this call. 3226 */ 3227 STATIC void 3228 xlog_ticket_put(xlog_t *log, 3229 xlog_ticket_t *ticket) 3230 { 3231 sv_destroy(&ticket->t_sema); 3232 3233 /* 3234 * Don't think caching will make that much difference. It's 3235 * more important to make debug easier. 3236 */ 3237 #if 0 3238 /* real code will want to use LIFO for caching */ 3239 ticket->t_next = log->l_freelist; 3240 log->l_freelist = ticket; 3241 /* no need to clear fields */ 3242 #else 3243 /* When we debug, it is easier if tickets are cycled */ 3244 ticket->t_next = NULL; 3245 if (log->l_tail) { 3246 log->l_tail->t_next = ticket; 3247 } else { 3248 ASSERT(log->l_freelist == NULL); 3249 log->l_freelist = ticket; 3250 } 3251 log->l_tail = ticket; 3252 #endif /* DEBUG */ 3253 log->l_ticket_cnt++; 3254 } /* xlog_ticket_put */ 3255 3256 3257 /* 3258 * Grab ticket off freelist or allocation some more 3259 */ 3260 xlog_ticket_t * 3261 xlog_ticket_get(xlog_t *log, 3262 int unit_bytes, 3263 int cnt, 3264 char client, 3265 uint xflags) 3266 { 3267 xlog_ticket_t *tic; 3268 uint num_headers; 3269 SPLDECL(s); 3270 3271 alloc: 3272 if (log->l_freelist == NULL) 3273 xlog_state_ticket_alloc(log); /* potentially sleep */ 3274 3275 s = LOG_LOCK(log); 3276 if (log->l_freelist == NULL) { 3277 LOG_UNLOCK(log, s); 3278 goto alloc; 3279 } 3280 tic = log->l_freelist; 3281 log->l_freelist = tic->t_next; 3282 if (log->l_freelist == NULL) 3283 log->l_tail = NULL; 3284 log->l_ticket_cnt--; 3285 LOG_UNLOCK(log, s); 3286 3287 /* 3288 * Permanent reservations have up to 'cnt'-1 active log operations 3289 * in the log. A unit in this case is the amount of space for one 3290 * of these log operations. Normal reservations have a cnt of 1 3291 * and their unit amount is the total amount of space required. 3292 * 3293 * The following lines of code account for non-transaction data 3294 * which occupy space in the on-disk log. 3295 * 3296 * Normal form of a transaction is: 3297 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> 3298 * and then there are LR hdrs, split-recs and roundoff at end of syncs. 3299 * 3300 * We need to account for all the leadup data and trailer data 3301 * around the transaction data. 3302 * And then we need to account for the worst case in terms of using 3303 * more space. 3304 * The worst case will happen if: 3305 * - the placement of the transaction happens to be such that the 3306 * roundoff is at its maximum 3307 * - the transaction data is synced before the commit record is synced 3308 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> 3309 * Therefore the commit record is in its own Log Record. 3310 * This can happen as the commit record is called with its 3311 * own region to xlog_write(). 3312 * This then means that in the worst case, roundoff can happen for 3313 * the commit-rec as well. 3314 * The commit-rec is smaller than padding in this scenario and so it is 3315 * not added separately. 3316 */ 3317 3318 /* for trans header */ 3319 unit_bytes += sizeof(xlog_op_header_t); 3320 unit_bytes += sizeof(xfs_trans_header_t); 3321 3322 /* for start-rec */ 3323 unit_bytes += sizeof(xlog_op_header_t); 3324 3325 /* for LR headers */ 3326 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); 3327 unit_bytes += log->l_iclog_hsize * num_headers; 3328 3329 /* for commit-rec LR header - note: padding will subsume the ophdr */ 3330 unit_bytes += log->l_iclog_hsize; 3331 3332 /* for split-recs - ophdrs added when data split over LRs */ 3333 unit_bytes += sizeof(xlog_op_header_t) * num_headers; 3334 3335 /* for roundoff padding for transaction data and one for commit record */ 3336 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 3337 log->l_mp->m_sb.sb_logsunit > 1) { 3338 /* log su roundoff */ 3339 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; 3340 } else { 3341 /* BB roundoff */ 3342 unit_bytes += 2*BBSIZE; 3343 } 3344 3345 tic->t_unit_res = unit_bytes; 3346 tic->t_curr_res = unit_bytes; 3347 tic->t_cnt = cnt; 3348 tic->t_ocnt = cnt; 3349 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); 3350 tic->t_clientid = client; 3351 tic->t_flags = XLOG_TIC_INITED; 3352 tic->t_trans_type = 0; 3353 if (xflags & XFS_LOG_PERM_RESERV) 3354 tic->t_flags |= XLOG_TIC_PERM_RESERV; 3355 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick"); 3356 3357 XLOG_TIC_RESET_RES(tic); 3358 3359 return tic; 3360 } /* xlog_ticket_get */ 3361 3362 3363 /****************************************************************************** 3364 * 3365 * Log debug routines 3366 * 3367 ****************************************************************************** 3368 */ 3369 #if defined(DEBUG) 3370 /* 3371 * Make sure that the destination ptr is within the valid data region of 3372 * one of the iclogs. This uses backup pointers stored in a different 3373 * part of the log in case we trash the log structure. 3374 */ 3375 void 3376 xlog_verify_dest_ptr(xlog_t *log, 3377 __psint_t ptr) 3378 { 3379 int i; 3380 int good_ptr = 0; 3381 3382 for (i=0; i < log->l_iclog_bufs; i++) { 3383 if (ptr >= (__psint_t)log->l_iclog_bak[i] && 3384 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) 3385 good_ptr++; 3386 } 3387 if (! good_ptr) 3388 xlog_panic("xlog_verify_dest_ptr: invalid ptr"); 3389 } /* xlog_verify_dest_ptr */ 3390 3391 STATIC void 3392 xlog_verify_grant_head(xlog_t *log, int equals) 3393 { 3394 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { 3395 if (equals) 3396 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); 3397 else 3398 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); 3399 } else { 3400 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); 3401 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); 3402 } 3403 } /* xlog_verify_grant_head */ 3404 3405 /* check if it will fit */ 3406 STATIC void 3407 xlog_verify_tail_lsn(xlog_t *log, 3408 xlog_in_core_t *iclog, 3409 xfs_lsn_t tail_lsn) 3410 { 3411 int blocks; 3412 3413 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { 3414 blocks = 3415 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); 3416 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) 3417 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3418 } else { 3419 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); 3420 3421 if (BLOCK_LSN(tail_lsn) == log->l_prev_block) 3422 xlog_panic("xlog_verify_tail_lsn: tail wrapped"); 3423 3424 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; 3425 if (blocks < BTOBB(iclog->ic_offset) + 1) 3426 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3427 } 3428 } /* xlog_verify_tail_lsn */ 3429 3430 /* 3431 * Perform a number of checks on the iclog before writing to disk. 3432 * 3433 * 1. Make sure the iclogs are still circular 3434 * 2. Make sure we have a good magic number 3435 * 3. Make sure we don't have magic numbers in the data 3436 * 4. Check fields of each log operation header for: 3437 * A. Valid client identifier 3438 * B. tid ptr value falls in valid ptr space (user space code) 3439 * C. Length in log record header is correct according to the 3440 * individual operation headers within record. 3441 * 5. When a bwrite will occur within 5 blocks of the front of the physical 3442 * log, check the preceding blocks of the physical log to make sure all 3443 * the cycle numbers agree with the current cycle number. 3444 */ 3445 STATIC void 3446 xlog_verify_iclog(xlog_t *log, 3447 xlog_in_core_t *iclog, 3448 int count, 3449 boolean_t syncing) 3450 { 3451 xlog_op_header_t *ophead; 3452 xlog_in_core_t *icptr; 3453 xlog_in_core_2_t *xhdr; 3454 xfs_caddr_t ptr; 3455 xfs_caddr_t base_ptr; 3456 __psint_t field_offset; 3457 __uint8_t clientid; 3458 int len, i, j, k, op_len; 3459 int idx; 3460 SPLDECL(s); 3461 3462 /* check validity of iclog pointers */ 3463 s = LOG_LOCK(log); 3464 icptr = log->l_iclog; 3465 for (i=0; i < log->l_iclog_bufs; i++) { 3466 if (icptr == NULL) 3467 xlog_panic("xlog_verify_iclog: invalid ptr"); 3468 icptr = icptr->ic_next; 3469 } 3470 if (icptr != log->l_iclog) 3471 xlog_panic("xlog_verify_iclog: corrupt iclog ring"); 3472 LOG_UNLOCK(log, s); 3473 3474 /* check log magic numbers */ 3475 ptr = (xfs_caddr_t) &(iclog->ic_header); 3476 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM) 3477 xlog_panic("xlog_verify_iclog: invalid magic num"); 3478 3479 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count; 3480 ptr += BBSIZE) { 3481 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 3482 xlog_panic("xlog_verify_iclog: unexpected magic num"); 3483 } 3484 3485 /* check fields */ 3486 len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT); 3487 ptr = iclog->ic_datap; 3488 base_ptr = ptr; 3489 ophead = (xlog_op_header_t *)ptr; 3490 xhdr = (xlog_in_core_2_t *)&iclog->ic_header; 3491 for (i = 0; i < len; i++) { 3492 ophead = (xlog_op_header_t *)ptr; 3493 3494 /* clientid is only 1 byte */ 3495 field_offset = (__psint_t) 3496 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); 3497 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3498 clientid = ophead->oh_clientid; 3499 } else { 3500 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); 3501 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3502 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3503 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3504 clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3505 } else { 3506 clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3507 } 3508 } 3509 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) 3510 cmn_err(CE_WARN, "xlog_verify_iclog: " 3511 "invalid clientid %d op 0x%p offset 0x%lx", 3512 clientid, ophead, (unsigned long)field_offset); 3513 3514 /* check length */ 3515 field_offset = (__psint_t) 3516 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); 3517 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3518 op_len = INT_GET(ophead->oh_len, ARCH_CONVERT); 3519 } else { 3520 idx = BTOBBT((__psint_t)&ophead->oh_len - 3521 (__psint_t)iclog->ic_datap); 3522 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3523 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3524 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3525 op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3526 } else { 3527 op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3528 } 3529 } 3530 ptr += sizeof(xlog_op_header_t) + op_len; 3531 } 3532 } /* xlog_verify_iclog */ 3533 #endif 3534 3535 /* 3536 * Mark all iclogs IOERROR. LOG_LOCK is held by the caller. 3537 */ 3538 STATIC int 3539 xlog_state_ioerror( 3540 xlog_t *log) 3541 { 3542 xlog_in_core_t *iclog, *ic; 3543 3544 iclog = log->l_iclog; 3545 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { 3546 /* 3547 * Mark all the incore logs IOERROR. 3548 * From now on, no log flushes will result. 3549 */ 3550 ic = iclog; 3551 do { 3552 ic->ic_state = XLOG_STATE_IOERROR; 3553 ic = ic->ic_next; 3554 } while (ic != iclog); 3555 return 0; 3556 } 3557 /* 3558 * Return non-zero, if state transition has already happened. 3559 */ 3560 return 1; 3561 } 3562 3563 /* 3564 * This is called from xfs_force_shutdown, when we're forcibly 3565 * shutting down the filesystem, typically because of an IO error. 3566 * Our main objectives here are to make sure that: 3567 * a. the filesystem gets marked 'SHUTDOWN' for all interested 3568 * parties to find out, 'atomically'. 3569 * b. those who're sleeping on log reservations, pinned objects and 3570 * other resources get woken up, and be told the bad news. 3571 * c. nothing new gets queued up after (a) and (b) are done. 3572 * d. if !logerror, flush the iclogs to disk, then seal them off 3573 * for business. 3574 */ 3575 int 3576 xfs_log_force_umount( 3577 struct xfs_mount *mp, 3578 int logerror) 3579 { 3580 xlog_ticket_t *tic; 3581 xlog_t *log; 3582 int retval; 3583 int dummy; 3584 SPLDECL(s); 3585 SPLDECL(s2); 3586 3587 log = mp->m_log; 3588 3589 /* 3590 * If this happens during log recovery, don't worry about 3591 * locking; the log isn't open for business yet. 3592 */ 3593 if (!log || 3594 log->l_flags & XLOG_ACTIVE_RECOVERY) { 3595 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3596 XFS_BUF_DONE(mp->m_sb_bp); 3597 return 0; 3598 } 3599 3600 /* 3601 * Somebody could've already done the hard work for us. 3602 * No need to get locks for this. 3603 */ 3604 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { 3605 ASSERT(XLOG_FORCED_SHUTDOWN(log)); 3606 return 1; 3607 } 3608 retval = 0; 3609 /* 3610 * We must hold both the GRANT lock and the LOG lock, 3611 * before we mark the filesystem SHUTDOWN and wake 3612 * everybody up to tell the bad news. 3613 */ 3614 s = GRANT_LOCK(log); 3615 s2 = LOG_LOCK(log); 3616 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3617 XFS_BUF_DONE(mp->m_sb_bp); 3618 /* 3619 * This flag is sort of redundant because of the mount flag, but 3620 * it's good to maintain the separation between the log and the rest 3621 * of XFS. 3622 */ 3623 log->l_flags |= XLOG_IO_ERROR; 3624 3625 /* 3626 * If we hit a log error, we want to mark all the iclogs IOERROR 3627 * while we're still holding the loglock. 3628 */ 3629 if (logerror) 3630 retval = xlog_state_ioerror(log); 3631 LOG_UNLOCK(log, s2); 3632 3633 /* 3634 * We don't want anybody waiting for log reservations 3635 * after this. That means we have to wake up everybody 3636 * queued up on reserve_headq as well as write_headq. 3637 * In addition, we make sure in xlog_{re}grant_log_space 3638 * that we don't enqueue anything once the SHUTDOWN flag 3639 * is set, and this action is protected by the GRANTLOCK. 3640 */ 3641 if ((tic = log->l_reserve_headq)) { 3642 do { 3643 sv_signal(&tic->t_sema); 3644 tic = tic->t_next; 3645 } while (tic != log->l_reserve_headq); 3646 } 3647 3648 if ((tic = log->l_write_headq)) { 3649 do { 3650 sv_signal(&tic->t_sema); 3651 tic = tic->t_next; 3652 } while (tic != log->l_write_headq); 3653 } 3654 GRANT_UNLOCK(log, s); 3655 3656 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { 3657 ASSERT(!logerror); 3658 /* 3659 * Force the incore logs to disk before shutting the 3660 * log down completely. 3661 */ 3662 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy); 3663 s2 = LOG_LOCK(log); 3664 retval = xlog_state_ioerror(log); 3665 LOG_UNLOCK(log, s2); 3666 } 3667 /* 3668 * Wake up everybody waiting on xfs_log_force. 3669 * Callback all log item committed functions as if the 3670 * log writes were completed. 3671 */ 3672 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); 3673 3674 #ifdef XFSERRORDEBUG 3675 { 3676 xlog_in_core_t *iclog; 3677 3678 s = LOG_LOCK(log); 3679 iclog = log->l_iclog; 3680 do { 3681 ASSERT(iclog->ic_callback == 0); 3682 iclog = iclog->ic_next; 3683 } while (iclog != log->l_iclog); 3684 LOG_UNLOCK(log, s); 3685 } 3686 #endif 3687 /* return non-zero if log IOERROR transition had already happened */ 3688 return retval; 3689 } 3690 3691 STATIC int 3692 xlog_iclogs_empty(xlog_t *log) 3693 { 3694 xlog_in_core_t *iclog; 3695 3696 iclog = log->l_iclog; 3697 do { 3698 /* endianness does not matter here, zero is zero in 3699 * any language. 3700 */ 3701 if (iclog->ic_header.h_num_logops) 3702 return 0; 3703 iclog = iclog->ic_next; 3704 } while (iclog != log->l_iclog); 3705 return 1; 3706 } 3707