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 static void 256 xlog_tic_reset_res(xlog_ticket_t *tic) 257 { 258 tic->t_res_num = 0; 259 tic->t_res_arr_sum = 0; 260 tic->t_res_num_ophdrs = 0; 261 } 262 263 static void 264 xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) 265 { 266 if (tic->t_res_num == XLOG_TIC_LEN_MAX) { 267 /* add to overflow and start again */ 268 tic->t_res_o_flow += tic->t_res_arr_sum; 269 tic->t_res_num = 0; 270 tic->t_res_arr_sum = 0; 271 } 272 273 tic->t_res_arr[tic->t_res_num].r_len = len; 274 tic->t_res_arr[tic->t_res_num].r_type = type; 275 tic->t_res_arr_sum += len; 276 tic->t_res_num++; 277 } 278 279 /* 280 * NOTES: 281 * 282 * 1. currblock field gets updated at startup and after in-core logs 283 * marked as with WANT_SYNC. 284 */ 285 286 /* 287 * This routine is called when a user of a log manager ticket is done with 288 * the reservation. If the ticket was ever used, then a commit record for 289 * the associated transaction is written out as a log operation header with 290 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with 291 * a given ticket. If the ticket was one with a permanent reservation, then 292 * a few operations are done differently. Permanent reservation tickets by 293 * default don't release the reservation. They just commit the current 294 * transaction with the belief that the reservation is still needed. A flag 295 * must be passed in before permanent reservations are actually released. 296 * When these type of tickets are not released, they need to be set into 297 * the inited state again. By doing this, a start record will be written 298 * out when the next write occurs. 299 */ 300 xfs_lsn_t 301 xfs_log_done(xfs_mount_t *mp, 302 xfs_log_ticket_t xtic, 303 void **iclog, 304 uint flags) 305 { 306 xlog_t *log = mp->m_log; 307 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; 308 xfs_lsn_t lsn = 0; 309 310 if (XLOG_FORCED_SHUTDOWN(log) || 311 /* 312 * If nothing was ever written, don't write out commit record. 313 * If we get an error, just continue and give back the log ticket. 314 */ 315 (((ticket->t_flags & XLOG_TIC_INITED) == 0) && 316 (xlog_commit_record(mp, ticket, 317 (xlog_in_core_t **)iclog, &lsn)))) { 318 lsn = (xfs_lsn_t) -1; 319 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { 320 flags |= XFS_LOG_REL_PERM_RESERV; 321 } 322 } 323 324 325 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || 326 (flags & XFS_LOG_REL_PERM_RESERV)) { 327 /* 328 * Release ticket if not permanent reservation or a specific 329 * request has been made to release a permanent reservation. 330 */ 331 xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)"); 332 xlog_ungrant_log_space(log, ticket); 333 xlog_state_put_ticket(log, ticket); 334 } else { 335 xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)"); 336 xlog_regrant_reserve_log_space(log, ticket); 337 } 338 339 /* If this ticket was a permanent reservation and we aren't 340 * trying to release it, reset the inited flags; so next time 341 * we write, a start record will be written out. 342 */ 343 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) && 344 (flags & XFS_LOG_REL_PERM_RESERV) == 0) 345 ticket->t_flags |= XLOG_TIC_INITED; 346 347 return lsn; 348 } /* xfs_log_done */ 349 350 351 /* 352 * Force the in-core log to disk. If flags == XFS_LOG_SYNC, 353 * the force is done synchronously. 354 * 355 * Asynchronous forces are implemented by setting the WANT_SYNC 356 * bit in the appropriate in-core log and then returning. 357 * 358 * Synchronous forces are implemented with a semaphore. All callers 359 * to force a given lsn to disk will wait on a semaphore attached to the 360 * specific in-core log. When given in-core log finally completes its 361 * write to disk, that thread will wake up all threads waiting on the 362 * semaphore. 363 */ 364 int 365 _xfs_log_force( 366 xfs_mount_t *mp, 367 xfs_lsn_t lsn, 368 uint flags, 369 int *log_flushed) 370 { 371 xlog_t *log = mp->m_log; 372 int dummy; 373 374 if (!log_flushed) 375 log_flushed = &dummy; 376 377 ASSERT(flags & XFS_LOG_FORCE); 378 379 XFS_STATS_INC(xs_log_force); 380 381 if (log->l_flags & XLOG_IO_ERROR) 382 return XFS_ERROR(EIO); 383 if (lsn == 0) 384 return xlog_state_sync_all(log, flags, log_flushed); 385 else 386 return xlog_state_sync(log, lsn, flags, log_flushed); 387 } /* xfs_log_force */ 388 389 /* 390 * Attaches a new iclog I/O completion callback routine during 391 * transaction commit. If the log is in error state, a non-zero 392 * return code is handed back and the caller is responsible for 393 * executing the callback at an appropriate time. 394 */ 395 int 396 xfs_log_notify(xfs_mount_t *mp, /* mount of partition */ 397 void *iclog_hndl, /* iclog to hang callback off */ 398 xfs_log_callback_t *cb) 399 { 400 xlog_t *log = mp->m_log; 401 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 402 int abortflg, spl; 403 404 cb->cb_next = NULL; 405 spl = LOG_LOCK(log); 406 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); 407 if (!abortflg) { 408 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || 409 (iclog->ic_state == XLOG_STATE_WANT_SYNC)); 410 cb->cb_next = NULL; 411 *(iclog->ic_callback_tail) = cb; 412 iclog->ic_callback_tail = &(cb->cb_next); 413 } 414 LOG_UNLOCK(log, spl); 415 return abortflg; 416 } /* xfs_log_notify */ 417 418 int 419 xfs_log_release_iclog(xfs_mount_t *mp, 420 void *iclog_hndl) 421 { 422 xlog_t *log = mp->m_log; 423 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 424 425 if (xlog_state_release_iclog(log, iclog)) { 426 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 427 return EIO; 428 } 429 430 return 0; 431 } 432 433 /* 434 * 1. Reserve an amount of on-disk log space and return a ticket corresponding 435 * to the reservation. 436 * 2. Potentially, push buffers at tail of log to disk. 437 * 438 * Each reservation is going to reserve extra space for a log record header. 439 * When writes happen to the on-disk log, we don't subtract the length of the 440 * log record header from any reservation. By wasting space in each 441 * reservation, we prevent over allocation problems. 442 */ 443 int 444 xfs_log_reserve(xfs_mount_t *mp, 445 int unit_bytes, 446 int cnt, 447 xfs_log_ticket_t *ticket, 448 __uint8_t client, 449 uint flags, 450 uint t_type) 451 { 452 xlog_t *log = mp->m_log; 453 xlog_ticket_t *internal_ticket; 454 int retval = 0; 455 456 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); 457 ASSERT((flags & XFS_LOG_NOSLEEP) == 0); 458 459 if (XLOG_FORCED_SHUTDOWN(log)) 460 return XFS_ERROR(EIO); 461 462 XFS_STATS_INC(xs_try_logspace); 463 464 if (*ticket != NULL) { 465 ASSERT(flags & XFS_LOG_PERM_RESERV); 466 internal_ticket = (xlog_ticket_t *)*ticket; 467 xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)"); 468 xlog_grant_push_ail(mp, internal_ticket->t_unit_res); 469 retval = xlog_regrant_write_log_space(log, internal_ticket); 470 } else { 471 /* may sleep if need to allocate more tickets */ 472 internal_ticket = xlog_ticket_get(log, unit_bytes, cnt, 473 client, flags); 474 internal_ticket->t_trans_type = t_type; 475 *ticket = internal_ticket; 476 xlog_trace_loggrant(log, internal_ticket, 477 (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ? 478 "xfs_log_reserve: create new ticket (permanent trans)" : 479 "xfs_log_reserve: create new ticket"); 480 xlog_grant_push_ail(mp, 481 (internal_ticket->t_unit_res * 482 internal_ticket->t_cnt)); 483 retval = xlog_grant_log_space(log, internal_ticket); 484 } 485 486 return retval; 487 } /* xfs_log_reserve */ 488 489 490 /* 491 * Mount a log filesystem 492 * 493 * mp - ubiquitous xfs mount point structure 494 * log_target - buftarg of on-disk log device 495 * blk_offset - Start block # where block size is 512 bytes (BBSIZE) 496 * num_bblocks - Number of BBSIZE blocks in on-disk log 497 * 498 * Return error or zero. 499 */ 500 int 501 xfs_log_mount(xfs_mount_t *mp, 502 xfs_buftarg_t *log_target, 503 xfs_daddr_t blk_offset, 504 int num_bblks) 505 { 506 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 507 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); 508 else { 509 cmn_err(CE_NOTE, 510 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", 511 mp->m_fsname); 512 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); 513 } 514 515 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); 516 517 /* 518 * skip log recovery on a norecovery mount. pretend it all 519 * just worked. 520 */ 521 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { 522 int error, readonly = (mp->m_flags & XFS_MOUNT_RDONLY); 523 524 if (readonly) 525 mp->m_flags &= ~XFS_MOUNT_RDONLY; 526 527 error = xlog_recover(mp->m_log); 528 529 if (readonly) 530 mp->m_flags |= XFS_MOUNT_RDONLY; 531 if (error) { 532 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); 533 xlog_dealloc_log(mp->m_log); 534 return error; 535 } 536 } 537 538 /* Normal transactions can now occur */ 539 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; 540 541 /* End mounting message in xfs_log_mount_finish */ 542 return 0; 543 } /* xfs_log_mount */ 544 545 /* 546 * Finish the recovery of the file system. This is separate from 547 * the xfs_log_mount() call, because it depends on the code in 548 * xfs_mountfs() to read in the root and real-time bitmap inodes 549 * between calling xfs_log_mount() and here. 550 * 551 * mp - ubiquitous xfs mount point structure 552 */ 553 int 554 xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags) 555 { 556 int error; 557 558 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 559 error = xlog_recover_finish(mp->m_log, mfsi_flags); 560 else { 561 error = 0; 562 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); 563 } 564 565 return error; 566 } 567 568 /* 569 * Unmount processing for the log. 570 */ 571 int 572 xfs_log_unmount(xfs_mount_t *mp) 573 { 574 int error; 575 576 error = xfs_log_unmount_write(mp); 577 xfs_log_unmount_dealloc(mp); 578 return error; 579 } 580 581 /* 582 * Final log writes as part of unmount. 583 * 584 * Mark the filesystem clean as unmount happens. Note that during relocation 585 * this routine needs to be executed as part of source-bag while the 586 * deallocation must not be done until source-end. 587 */ 588 589 /* 590 * Unmount record used to have a string "Unmount filesystem--" in the 591 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). 592 * We just write the magic number now since that particular field isn't 593 * currently architecture converted and "nUmount" is a bit foo. 594 * As far as I know, there weren't any dependencies on the old behaviour. 595 */ 596 597 int 598 xfs_log_unmount_write(xfs_mount_t *mp) 599 { 600 xlog_t *log = mp->m_log; 601 xlog_in_core_t *iclog; 602 #ifdef DEBUG 603 xlog_in_core_t *first_iclog; 604 #endif 605 xfs_log_iovec_t reg[1]; 606 xfs_log_ticket_t tic = NULL; 607 xfs_lsn_t lsn; 608 int error; 609 SPLDECL(s); 610 611 /* the data section must be 32 bit size aligned */ 612 struct { 613 __uint16_t magic; 614 __uint16_t pad1; 615 __uint32_t pad2; /* may as well make it 64 bits */ 616 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; 617 618 /* 619 * Don't write out unmount record on read-only mounts. 620 * Or, if we are doing a forced umount (typically because of IO errors). 621 */ 622 if (mp->m_flags & XFS_MOUNT_RDONLY) 623 return 0; 624 625 xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC); 626 627 #ifdef DEBUG 628 first_iclog = iclog = log->l_iclog; 629 do { 630 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 631 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); 632 ASSERT(iclog->ic_offset == 0); 633 } 634 iclog = iclog->ic_next; 635 } while (iclog != first_iclog); 636 #endif 637 if (! (XLOG_FORCED_SHUTDOWN(log))) { 638 reg[0].i_addr = (void*)&magic; 639 reg[0].i_len = sizeof(magic); 640 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT); 641 642 error = xfs_log_reserve(mp, 600, 1, &tic, 643 XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); 644 if (!error) { 645 /* remove inited flag */ 646 ((xlog_ticket_t *)tic)->t_flags = 0; 647 error = xlog_write(mp, reg, 1, tic, &lsn, 648 NULL, XLOG_UNMOUNT_TRANS); 649 /* 650 * At this point, we're umounting anyway, 651 * so there's no point in transitioning log state 652 * to IOERROR. Just continue... 653 */ 654 } 655 656 if (error) { 657 xfs_fs_cmn_err(CE_ALERT, mp, 658 "xfs_log_unmount: unmount record failed"); 659 } 660 661 662 s = LOG_LOCK(log); 663 iclog = log->l_iclog; 664 iclog->ic_refcnt++; 665 LOG_UNLOCK(log, s); 666 xlog_state_want_sync(log, iclog); 667 (void) xlog_state_release_iclog(log, iclog); 668 669 s = LOG_LOCK(log); 670 if (!(iclog->ic_state == XLOG_STATE_ACTIVE || 671 iclog->ic_state == XLOG_STATE_DIRTY)) { 672 if (!XLOG_FORCED_SHUTDOWN(log)) { 673 sv_wait(&iclog->ic_forcesema, PMEM, 674 &log->l_icloglock, s); 675 } else { 676 LOG_UNLOCK(log, s); 677 } 678 } else { 679 LOG_UNLOCK(log, s); 680 } 681 if (tic) { 682 xlog_trace_loggrant(log, tic, "unmount rec"); 683 xlog_ungrant_log_space(log, tic); 684 xlog_state_put_ticket(log, tic); 685 } 686 } else { 687 /* 688 * We're already in forced_shutdown mode, couldn't 689 * even attempt to write out the unmount transaction. 690 * 691 * Go through the motions of sync'ing and releasing 692 * the iclog, even though no I/O will actually happen, 693 * we need to wait for other log I/Os that may already 694 * be in progress. Do this as a separate section of 695 * code so we'll know if we ever get stuck here that 696 * we're in this odd situation of trying to unmount 697 * a file system that went into forced_shutdown as 698 * the result of an unmount.. 699 */ 700 s = LOG_LOCK(log); 701 iclog = log->l_iclog; 702 iclog->ic_refcnt++; 703 LOG_UNLOCK(log, s); 704 705 xlog_state_want_sync(log, iclog); 706 (void) xlog_state_release_iclog(log, iclog); 707 708 s = LOG_LOCK(log); 709 710 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE 711 || iclog->ic_state == XLOG_STATE_DIRTY 712 || iclog->ic_state == XLOG_STATE_IOERROR) ) { 713 714 sv_wait(&iclog->ic_forcesema, PMEM, 715 &log->l_icloglock, s); 716 } else { 717 LOG_UNLOCK(log, s); 718 } 719 } 720 721 return 0; 722 } /* xfs_log_unmount_write */ 723 724 /* 725 * Deallocate log structures for unmount/relocation. 726 */ 727 void 728 xfs_log_unmount_dealloc(xfs_mount_t *mp) 729 { 730 xlog_dealloc_log(mp->m_log); 731 } 732 733 /* 734 * Write region vectors to log. The write happens using the space reservation 735 * of the ticket (tic). It is not a requirement that all writes for a given 736 * transaction occur with one call to xfs_log_write(). 737 */ 738 int 739 xfs_log_write(xfs_mount_t * mp, 740 xfs_log_iovec_t reg[], 741 int nentries, 742 xfs_log_ticket_t tic, 743 xfs_lsn_t *start_lsn) 744 { 745 int error; 746 xlog_t *log = mp->m_log; 747 748 if (XLOG_FORCED_SHUTDOWN(log)) 749 return XFS_ERROR(EIO); 750 751 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { 752 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 753 } 754 return error; 755 } /* xfs_log_write */ 756 757 758 void 759 xfs_log_move_tail(xfs_mount_t *mp, 760 xfs_lsn_t tail_lsn) 761 { 762 xlog_ticket_t *tic; 763 xlog_t *log = mp->m_log; 764 int need_bytes, free_bytes, cycle, bytes; 765 SPLDECL(s); 766 767 if (XLOG_FORCED_SHUTDOWN(log)) 768 return; 769 ASSERT(!XFS_FORCED_SHUTDOWN(mp)); 770 771 if (tail_lsn == 0) { 772 /* needed since sync_lsn is 64 bits */ 773 s = LOG_LOCK(log); 774 tail_lsn = log->l_last_sync_lsn; 775 LOG_UNLOCK(log, s); 776 } 777 778 s = GRANT_LOCK(log); 779 780 /* Also an invalid lsn. 1 implies that we aren't passing in a valid 781 * tail_lsn. 782 */ 783 if (tail_lsn != 1) { 784 log->l_tail_lsn = tail_lsn; 785 } 786 787 if ((tic = log->l_write_headq)) { 788 #ifdef DEBUG 789 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 790 panic("Recovery problem"); 791 #endif 792 cycle = log->l_grant_write_cycle; 793 bytes = log->l_grant_write_bytes; 794 free_bytes = xlog_space_left(log, cycle, bytes); 795 do { 796 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); 797 798 if (free_bytes < tic->t_unit_res && tail_lsn != 1) 799 break; 800 tail_lsn = 0; 801 free_bytes -= tic->t_unit_res; 802 sv_signal(&tic->t_sema); 803 tic = tic->t_next; 804 } while (tic != log->l_write_headq); 805 } 806 if ((tic = log->l_reserve_headq)) { 807 #ifdef DEBUG 808 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 809 panic("Recovery problem"); 810 #endif 811 cycle = log->l_grant_reserve_cycle; 812 bytes = log->l_grant_reserve_bytes; 813 free_bytes = xlog_space_left(log, cycle, bytes); 814 do { 815 if (tic->t_flags & XLOG_TIC_PERM_RESERV) 816 need_bytes = tic->t_unit_res*tic->t_cnt; 817 else 818 need_bytes = tic->t_unit_res; 819 if (free_bytes < need_bytes && tail_lsn != 1) 820 break; 821 tail_lsn = 0; 822 free_bytes -= need_bytes; 823 sv_signal(&tic->t_sema); 824 tic = tic->t_next; 825 } while (tic != log->l_reserve_headq); 826 } 827 GRANT_UNLOCK(log, s); 828 } /* xfs_log_move_tail */ 829 830 /* 831 * Determine if we have a transaction that has gone to disk 832 * that needs to be covered. Log activity needs to be idle (no AIL and 833 * nothing in the iclogs). And, we need to be in the right state indicating 834 * something has gone out. 835 */ 836 int 837 xfs_log_need_covered(xfs_mount_t *mp) 838 { 839 SPLDECL(s); 840 int needed = 0, gen; 841 xlog_t *log = mp->m_log; 842 843 if (!xfs_fs_writable(mp)) 844 return 0; 845 846 s = LOG_LOCK(log); 847 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || 848 (log->l_covered_state == XLOG_STATE_COVER_NEED2)) 849 && !xfs_trans_first_ail(mp, &gen) 850 && xlog_iclogs_empty(log)) { 851 if (log->l_covered_state == XLOG_STATE_COVER_NEED) 852 log->l_covered_state = XLOG_STATE_COVER_DONE; 853 else { 854 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); 855 log->l_covered_state = XLOG_STATE_COVER_DONE2; 856 } 857 needed = 1; 858 } 859 LOG_UNLOCK(log, s); 860 return needed; 861 } 862 863 /****************************************************************************** 864 * 865 * local routines 866 * 867 ****************************************************************************** 868 */ 869 870 /* xfs_trans_tail_ail returns 0 when there is nothing in the list. 871 * The log manager must keep track of the last LR which was committed 872 * to disk. The lsn of this LR will become the new tail_lsn whenever 873 * xfs_trans_tail_ail returns 0. If we don't do this, we run into 874 * the situation where stuff could be written into the log but nothing 875 * was ever in the AIL when asked. Eventually, we panic since the 876 * tail hits the head. 877 * 878 * We may be holding the log iclog lock upon entering this routine. 879 */ 880 xfs_lsn_t 881 xlog_assign_tail_lsn(xfs_mount_t *mp) 882 { 883 xfs_lsn_t tail_lsn; 884 SPLDECL(s); 885 xlog_t *log = mp->m_log; 886 887 tail_lsn = xfs_trans_tail_ail(mp); 888 s = GRANT_LOCK(log); 889 if (tail_lsn != 0) { 890 log->l_tail_lsn = tail_lsn; 891 } else { 892 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; 893 } 894 GRANT_UNLOCK(log, s); 895 896 return tail_lsn; 897 } /* xlog_assign_tail_lsn */ 898 899 900 /* 901 * Return the space in the log between the tail and the head. The head 902 * is passed in the cycle/bytes formal parms. In the special case where 903 * the reserve head has wrapped passed the tail, this calculation is no 904 * longer valid. In this case, just return 0 which means there is no space 905 * in the log. This works for all places where this function is called 906 * with the reserve head. Of course, if the write head were to ever 907 * wrap the tail, we should blow up. Rather than catch this case here, 908 * we depend on other ASSERTions in other parts of the code. XXXmiken 909 * 910 * This code also handles the case where the reservation head is behind 911 * the tail. The details of this case are described below, but the end 912 * result is that we return the size of the log as the amount of space left. 913 */ 914 int 915 xlog_space_left(xlog_t *log, int cycle, int bytes) 916 { 917 int free_bytes; 918 int tail_bytes; 919 int tail_cycle; 920 921 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); 922 tail_cycle = CYCLE_LSN(log->l_tail_lsn); 923 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { 924 free_bytes = log->l_logsize - (bytes - tail_bytes); 925 } else if ((tail_cycle + 1) < cycle) { 926 return 0; 927 } else if (tail_cycle < cycle) { 928 ASSERT(tail_cycle == (cycle - 1)); 929 free_bytes = tail_bytes - bytes; 930 } else { 931 /* 932 * The reservation head is behind the tail. 933 * In this case we just want to return the size of the 934 * log as the amount of space left. 935 */ 936 xfs_fs_cmn_err(CE_ALERT, log->l_mp, 937 "xlog_space_left: head behind tail\n" 938 " tail_cycle = %d, tail_bytes = %d\n" 939 " GH cycle = %d, GH bytes = %d", 940 tail_cycle, tail_bytes, cycle, bytes); 941 ASSERT(0); 942 free_bytes = log->l_logsize; 943 } 944 return free_bytes; 945 } /* xlog_space_left */ 946 947 948 /* 949 * Log function which is called when an io completes. 950 * 951 * The log manager needs its own routine, in order to control what 952 * happens with the buffer after the write completes. 953 */ 954 void 955 xlog_iodone(xfs_buf_t *bp) 956 { 957 xlog_in_core_t *iclog; 958 xlog_t *l; 959 int aborted; 960 961 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 962 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); 963 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 964 aborted = 0; 965 966 /* 967 * Some versions of cpp barf on the recursive definition of 968 * ic_log -> hic_fields.ic_log and expand ic_log twice when 969 * it is passed through two macros. Workaround broken cpp. 970 */ 971 l = iclog->ic_log; 972 973 /* 974 * If the ordered flag has been removed by a lower 975 * layer, it means the underlyin device no longer supports 976 * barrier I/O. Warn loudly and turn off barriers. 977 */ 978 if ((l->l_mp->m_flags & XFS_MOUNT_BARRIER) && !XFS_BUF_ORDERED(bp)) { 979 l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER; 980 xfs_fs_cmn_err(CE_WARN, l->l_mp, 981 "xlog_iodone: Barriers are no longer supported" 982 " by device. Disabling barriers\n"); 983 xfs_buftrace("XLOG_IODONE BARRIERS OFF", bp); 984 } 985 986 /* 987 * Race to shutdown the filesystem if we see an error. 988 */ 989 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, 990 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { 991 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); 992 XFS_BUF_STALE(bp); 993 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); 994 /* 995 * This flag will be propagated to the trans-committed 996 * callback routines to let them know that the log-commit 997 * didn't succeed. 998 */ 999 aborted = XFS_LI_ABORTED; 1000 } else if (iclog->ic_state & XLOG_STATE_IOERROR) { 1001 aborted = XFS_LI_ABORTED; 1002 } 1003 1004 /* log I/O is always issued ASYNC */ 1005 ASSERT(XFS_BUF_ISASYNC(bp)); 1006 xlog_state_done_syncing(iclog, aborted); 1007 /* 1008 * do not reference the buffer (bp) here as we could race 1009 * with it being freed after writing the unmount record to the 1010 * log. 1011 */ 1012 1013 } /* xlog_iodone */ 1014 1015 /* 1016 * The bdstrat callback function for log bufs. This gives us a central 1017 * place to trap bufs in case we get hit by a log I/O error and need to 1018 * shutdown. Actually, in practice, even when we didn't get a log error, 1019 * we transition the iclogs to IOERROR state *after* flushing all existing 1020 * iclogs to disk. This is because we don't want anymore new transactions to be 1021 * started or completed afterwards. 1022 */ 1023 STATIC int 1024 xlog_bdstrat_cb(struct xfs_buf *bp) 1025 { 1026 xlog_in_core_t *iclog; 1027 1028 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 1029 1030 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { 1031 /* note for irix bstrat will need struct bdevsw passed 1032 * Fix the following macro if the code ever is merged 1033 */ 1034 XFS_bdstrat(bp); 1035 return 0; 1036 } 1037 1038 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); 1039 XFS_BUF_ERROR(bp, EIO); 1040 XFS_BUF_STALE(bp); 1041 xfs_biodone(bp); 1042 return XFS_ERROR(EIO); 1043 1044 1045 } 1046 1047 /* 1048 * Return size of each in-core log record buffer. 1049 * 1050 * All machines get 8 x 32KB buffers by default, unless tuned otherwise. 1051 * 1052 * If the filesystem blocksize is too large, we may need to choose a 1053 * larger size since the directory code currently logs entire blocks. 1054 */ 1055 1056 STATIC void 1057 xlog_get_iclog_buffer_size(xfs_mount_t *mp, 1058 xlog_t *log) 1059 { 1060 int size; 1061 int xhdrs; 1062 1063 if (mp->m_logbufs <= 0) 1064 log->l_iclog_bufs = XLOG_MAX_ICLOGS; 1065 else 1066 log->l_iclog_bufs = mp->m_logbufs; 1067 1068 /* 1069 * Buffer size passed in from mount system call. 1070 */ 1071 if (mp->m_logbsize > 0) { 1072 size = log->l_iclog_size = mp->m_logbsize; 1073 log->l_iclog_size_log = 0; 1074 while (size != 1) { 1075 log->l_iclog_size_log++; 1076 size >>= 1; 1077 } 1078 1079 if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) { 1080 /* # headers = size / 32K 1081 * one header holds cycles from 32K of data 1082 */ 1083 1084 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; 1085 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) 1086 xhdrs++; 1087 log->l_iclog_hsize = xhdrs << BBSHIFT; 1088 log->l_iclog_heads = xhdrs; 1089 } else { 1090 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); 1091 log->l_iclog_hsize = BBSIZE; 1092 log->l_iclog_heads = 1; 1093 } 1094 goto done; 1095 } 1096 1097 /* All machines use 32KB buffers by default. */ 1098 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; 1099 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1100 1101 /* the default log size is 16k or 32k which is one header sector */ 1102 log->l_iclog_hsize = BBSIZE; 1103 log->l_iclog_heads = 1; 1104 1105 /* 1106 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use 1107 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers. 1108 */ 1109 if (mp->m_sb.sb_blocksize >= 16*1024) { 1110 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; 1111 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1112 if (mp->m_logbufs <= 0) { 1113 switch (mp->m_sb.sb_blocksize) { 1114 case 16*1024: /* 16 KB */ 1115 log->l_iclog_bufs = 3; 1116 break; 1117 case 32*1024: /* 32 KB */ 1118 log->l_iclog_bufs = 4; 1119 break; 1120 case 64*1024: /* 64 KB */ 1121 log->l_iclog_bufs = 8; 1122 break; 1123 default: 1124 xlog_panic("XFS: Invalid blocksize"); 1125 break; 1126 } 1127 } 1128 } 1129 1130 done: /* are we being asked to make the sizes selected above visible? */ 1131 if (mp->m_logbufs == 0) 1132 mp->m_logbufs = log->l_iclog_bufs; 1133 if (mp->m_logbsize == 0) 1134 mp->m_logbsize = log->l_iclog_size; 1135 } /* xlog_get_iclog_buffer_size */ 1136 1137 1138 /* 1139 * This routine initializes some of the log structure for a given mount point. 1140 * Its primary purpose is to fill in enough, so recovery can occur. However, 1141 * some other stuff may be filled in too. 1142 */ 1143 STATIC xlog_t * 1144 xlog_alloc_log(xfs_mount_t *mp, 1145 xfs_buftarg_t *log_target, 1146 xfs_daddr_t blk_offset, 1147 int num_bblks) 1148 { 1149 xlog_t *log; 1150 xlog_rec_header_t *head; 1151 xlog_in_core_t **iclogp; 1152 xlog_in_core_t *iclog, *prev_iclog=NULL; 1153 xfs_buf_t *bp; 1154 int i; 1155 int iclogsize; 1156 1157 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP); 1158 1159 log->l_mp = mp; 1160 log->l_targ = log_target; 1161 log->l_logsize = BBTOB(num_bblks); 1162 log->l_logBBstart = blk_offset; 1163 log->l_logBBsize = num_bblks; 1164 log->l_covered_state = XLOG_STATE_COVER_IDLE; 1165 log->l_flags |= XLOG_ACTIVE_RECOVERY; 1166 1167 log->l_prev_block = -1; 1168 ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0); 1169 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ 1170 log->l_last_sync_lsn = log->l_tail_lsn; 1171 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ 1172 log->l_grant_reserve_cycle = 1; 1173 log->l_grant_write_cycle = 1; 1174 1175 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) { 1176 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; 1177 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); 1178 /* for larger sector sizes, must have v2 or external log */ 1179 ASSERT(log->l_sectbb_log == 0 || 1180 log->l_logBBstart == 0 || 1181 XFS_SB_VERSION_HASLOGV2(&mp->m_sb)); 1182 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); 1183 } 1184 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; 1185 1186 xlog_get_iclog_buffer_size(mp, log); 1187 1188 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1189 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1190 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1191 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1192 ASSERT(XFS_BUF_ISBUSY(bp)); 1193 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 1194 log->l_xbuf = bp; 1195 1196 spinlock_init(&log->l_icloglock, "iclog"); 1197 spinlock_init(&log->l_grant_lock, "grhead_iclog"); 1198 initnsema(&log->l_flushsema, 0, "ic-flush"); 1199 xlog_state_ticket_alloc(log); /* wait until after icloglock inited */ 1200 1201 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ 1202 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); 1203 1204 iclogp = &log->l_iclog; 1205 /* 1206 * The amount of memory to allocate for the iclog structure is 1207 * rather funky due to the way the structure is defined. It is 1208 * done this way so that we can use different sizes for machines 1209 * with different amounts of memory. See the definition of 1210 * xlog_in_core_t in xfs_log_priv.h for details. 1211 */ 1212 iclogsize = log->l_iclog_size; 1213 ASSERT(log->l_iclog_size >= 4096); 1214 for (i=0; i < log->l_iclog_bufs; i++) { 1215 *iclogp = (xlog_in_core_t *) 1216 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP); 1217 iclog = *iclogp; 1218 iclog->ic_prev = prev_iclog; 1219 prev_iclog = iclog; 1220 1221 bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp); 1222 if (!XFS_BUF_CPSEMA(bp)) 1223 ASSERT(0); 1224 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1225 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1226 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1227 iclog->ic_bp = bp; 1228 iclog->hic_data = bp->b_addr; 1229 1230 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); 1231 1232 head = &iclog->ic_header; 1233 memset(head, 0, sizeof(xlog_rec_header_t)); 1234 INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); 1235 INT_SET(head->h_version, ARCH_CONVERT, 1236 XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); 1237 INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size); 1238 /* new fields */ 1239 INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT); 1240 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); 1241 1242 1243 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; 1244 iclog->ic_state = XLOG_STATE_ACTIVE; 1245 iclog->ic_log = log; 1246 iclog->ic_callback_tail = &(iclog->ic_callback); 1247 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize; 1248 1249 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); 1250 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); 1251 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force"); 1252 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write"); 1253 1254 iclogp = &iclog->ic_next; 1255 } 1256 *iclogp = log->l_iclog; /* complete ring */ 1257 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ 1258 1259 return log; 1260 } /* xlog_alloc_log */ 1261 1262 1263 /* 1264 * Write out the commit record of a transaction associated with the given 1265 * ticket. Return the lsn of the commit record. 1266 */ 1267 STATIC int 1268 xlog_commit_record(xfs_mount_t *mp, 1269 xlog_ticket_t *ticket, 1270 xlog_in_core_t **iclog, 1271 xfs_lsn_t *commitlsnp) 1272 { 1273 int error; 1274 xfs_log_iovec_t reg[1]; 1275 1276 reg[0].i_addr = NULL; 1277 reg[0].i_len = 0; 1278 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); 1279 1280 ASSERT_ALWAYS(iclog); 1281 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, 1282 iclog, XLOG_COMMIT_TRANS))) { 1283 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); 1284 } 1285 return error; 1286 } /* xlog_commit_record */ 1287 1288 1289 /* 1290 * Push on the buffer cache code if we ever use more than 75% of the on-disk 1291 * log space. This code pushes on the lsn which would supposedly free up 1292 * the 25% which we want to leave free. We may need to adopt a policy which 1293 * pushes on an lsn which is further along in the log once we reach the high 1294 * water mark. In this manner, we would be creating a low water mark. 1295 */ 1296 void 1297 xlog_grant_push_ail(xfs_mount_t *mp, 1298 int need_bytes) 1299 { 1300 xlog_t *log = mp->m_log; /* pointer to the log */ 1301 xfs_lsn_t tail_lsn; /* lsn of the log tail */ 1302 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ 1303 int free_blocks; /* free blocks left to write to */ 1304 int free_bytes; /* free bytes left to write to */ 1305 int threshold_block; /* block in lsn we'd like to be at */ 1306 int threshold_cycle; /* lsn cycle we'd like to be at */ 1307 int free_threshold; 1308 SPLDECL(s); 1309 1310 ASSERT(BTOBB(need_bytes) < log->l_logBBsize); 1311 1312 s = GRANT_LOCK(log); 1313 free_bytes = xlog_space_left(log, 1314 log->l_grant_reserve_cycle, 1315 log->l_grant_reserve_bytes); 1316 tail_lsn = log->l_tail_lsn; 1317 free_blocks = BTOBBT(free_bytes); 1318 1319 /* 1320 * Set the threshold for the minimum number of free blocks in the 1321 * log to the maximum of what the caller needs, one quarter of the 1322 * log, and 256 blocks. 1323 */ 1324 free_threshold = BTOBB(need_bytes); 1325 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); 1326 free_threshold = MAX(free_threshold, 256); 1327 if (free_blocks < free_threshold) { 1328 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; 1329 threshold_cycle = CYCLE_LSN(tail_lsn); 1330 if (threshold_block >= log->l_logBBsize) { 1331 threshold_block -= log->l_logBBsize; 1332 threshold_cycle += 1; 1333 } 1334 ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle, 1335 threshold_block); 1336 1337 /* Don't pass in an lsn greater than the lsn of the last 1338 * log record known to be on disk. 1339 */ 1340 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) 1341 threshold_lsn = log->l_last_sync_lsn; 1342 } 1343 GRANT_UNLOCK(log, s); 1344 1345 /* 1346 * Get the transaction layer to kick the dirty buffers out to 1347 * disk asynchronously. No point in trying to do this if 1348 * the filesystem is shutting down. 1349 */ 1350 if (threshold_lsn && 1351 !XLOG_FORCED_SHUTDOWN(log)) 1352 xfs_trans_push_ail(mp, threshold_lsn); 1353 } /* xlog_grant_push_ail */ 1354 1355 1356 /* 1357 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous 1358 * fashion. Previously, we should have moved the current iclog 1359 * ptr in the log to point to the next available iclog. This allows further 1360 * write to continue while this code syncs out an iclog ready to go. 1361 * Before an in-core log can be written out, the data section must be scanned 1362 * to save away the 1st word of each BBSIZE block into the header. We replace 1363 * it with the current cycle count. Each BBSIZE block is tagged with the 1364 * cycle count because there in an implicit assumption that drives will 1365 * guarantee that entire 512 byte blocks get written at once. In other words, 1366 * we can't have part of a 512 byte block written and part not written. By 1367 * tagging each block, we will know which blocks are valid when recovering 1368 * after an unclean shutdown. 1369 * 1370 * This routine is single threaded on the iclog. No other thread can be in 1371 * this routine with the same iclog. Changing contents of iclog can there- 1372 * fore be done without grabbing the state machine lock. Updating the global 1373 * log will require grabbing the lock though. 1374 * 1375 * The entire log manager uses a logical block numbering scheme. Only 1376 * log_sync (and then only bwrite()) know about the fact that the log may 1377 * not start with block zero on a given device. The log block start offset 1378 * is added immediately before calling bwrite(). 1379 */ 1380 1381 int 1382 xlog_sync(xlog_t *log, 1383 xlog_in_core_t *iclog) 1384 { 1385 xfs_caddr_t dptr; /* pointer to byte sized element */ 1386 xfs_buf_t *bp; 1387 int i, ops; 1388 uint count; /* byte count of bwrite */ 1389 uint count_init; /* initial count before roundup */ 1390 int roundoff; /* roundoff to BB or stripe */ 1391 int split = 0; /* split write into two regions */ 1392 int error; 1393 SPLDECL(s); 1394 int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb); 1395 1396 XFS_STATS_INC(xs_log_writes); 1397 ASSERT(iclog->ic_refcnt == 0); 1398 1399 /* Add for LR header */ 1400 count_init = log->l_iclog_hsize + iclog->ic_offset; 1401 1402 /* Round out the log write size */ 1403 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { 1404 /* we have a v2 stripe unit to use */ 1405 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); 1406 } else { 1407 count = BBTOB(BTOBB(count_init)); 1408 } 1409 roundoff = count - count_init; 1410 ASSERT(roundoff >= 0); 1411 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && 1412 roundoff < log->l_mp->m_sb.sb_logsunit) 1413 || 1414 (log->l_mp->m_sb.sb_logsunit <= 1 && 1415 roundoff < BBTOB(1))); 1416 1417 /* move grant heads by roundoff in sync */ 1418 s = GRANT_LOCK(log); 1419 xlog_grant_add_space(log, roundoff); 1420 GRANT_UNLOCK(log, s); 1421 1422 /* put cycle number in every block */ 1423 xlog_pack_data(log, iclog, roundoff); 1424 1425 /* real byte length */ 1426 if (v2) { 1427 INT_SET(iclog->ic_header.h_len, 1428 ARCH_CONVERT, 1429 iclog->ic_offset + roundoff); 1430 } else { 1431 INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset); 1432 } 1433 1434 /* put ops count in correct order */ 1435 ops = iclog->ic_header.h_num_logops; 1436 INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops); 1437 1438 bp = iclog->ic_bp; 1439 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); 1440 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1441 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT))); 1442 1443 XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); 1444 1445 /* Do we need to split this write into 2 parts? */ 1446 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { 1447 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); 1448 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); 1449 iclog->ic_bwritecnt = 2; /* split into 2 writes */ 1450 } else { 1451 iclog->ic_bwritecnt = 1; 1452 } 1453 XFS_BUF_SET_COUNT(bp, count); 1454 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ 1455 XFS_BUF_ZEROFLAGS(bp); 1456 XFS_BUF_BUSY(bp); 1457 XFS_BUF_ASYNC(bp); 1458 /* 1459 * Do an ordered write for the log block. 1460 * Its unnecessary to flush the first split block in the log wrap case. 1461 */ 1462 if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) 1463 XFS_BUF_ORDERED(bp); 1464 1465 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1466 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1467 1468 xlog_verify_iclog(log, iclog, count, B_TRUE); 1469 1470 /* account for log which doesn't start at block #0 */ 1471 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1472 /* 1473 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem 1474 * is shutting down. 1475 */ 1476 XFS_BUF_WRITE(bp); 1477 1478 if ((error = XFS_bwrite(bp))) { 1479 xfs_ioerror_alert("xlog_sync", log->l_mp, bp, 1480 XFS_BUF_ADDR(bp)); 1481 return error; 1482 } 1483 if (split) { 1484 bp = iclog->ic_log->l_xbuf; 1485 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == 1486 (unsigned long)1); 1487 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1488 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ 1489 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ 1490 (__psint_t)count), split); 1491 XFS_BUF_SET_FSPRIVATE(bp, iclog); 1492 XFS_BUF_ZEROFLAGS(bp); 1493 XFS_BUF_BUSY(bp); 1494 XFS_BUF_ASYNC(bp); 1495 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) 1496 XFS_BUF_ORDERED(bp); 1497 dptr = XFS_BUF_PTR(bp); 1498 /* 1499 * Bump the cycle numbers at the start of each block 1500 * since this part of the buffer is at the start of 1501 * a new cycle. Watch out for the header magic number 1502 * case, though. 1503 */ 1504 for (i=0; i<split; i += BBSIZE) { 1505 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1506 if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 1507 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1508 dptr += BBSIZE; 1509 } 1510 1511 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1512 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1513 1514 /* account for internal log which doesn't start at block #0 */ 1515 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1516 XFS_BUF_WRITE(bp); 1517 if ((error = XFS_bwrite(bp))) { 1518 xfs_ioerror_alert("xlog_sync (split)", log->l_mp, 1519 bp, XFS_BUF_ADDR(bp)); 1520 return error; 1521 } 1522 } 1523 return 0; 1524 } /* xlog_sync */ 1525 1526 1527 /* 1528 * Deallocate a log structure 1529 */ 1530 void 1531 xlog_dealloc_log(xlog_t *log) 1532 { 1533 xlog_in_core_t *iclog, *next_iclog; 1534 xlog_ticket_t *tic, *next_tic; 1535 int i; 1536 1537 1538 iclog = log->l_iclog; 1539 for (i=0; i<log->l_iclog_bufs; i++) { 1540 sv_destroy(&iclog->ic_forcesema); 1541 sv_destroy(&iclog->ic_writesema); 1542 xfs_buf_free(iclog->ic_bp); 1543 #ifdef XFS_LOG_TRACE 1544 if (iclog->ic_trace != NULL) { 1545 ktrace_free(iclog->ic_trace); 1546 } 1547 #endif 1548 next_iclog = iclog->ic_next; 1549 kmem_free(iclog, sizeof(xlog_in_core_t)); 1550 iclog = next_iclog; 1551 } 1552 freesema(&log->l_flushsema); 1553 spinlock_destroy(&log->l_icloglock); 1554 spinlock_destroy(&log->l_grant_lock); 1555 1556 /* XXXsup take a look at this again. */ 1557 if ((log->l_ticket_cnt != log->l_ticket_tcnt) && 1558 !XLOG_FORCED_SHUTDOWN(log)) { 1559 xfs_fs_cmn_err(CE_WARN, log->l_mp, 1560 "xlog_dealloc_log: (cnt: %d, total: %d)", 1561 log->l_ticket_cnt, log->l_ticket_tcnt); 1562 /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */ 1563 1564 } else { 1565 tic = log->l_unmount_free; 1566 while (tic) { 1567 next_tic = tic->t_next; 1568 kmem_free(tic, NBPP); 1569 tic = next_tic; 1570 } 1571 } 1572 xfs_buf_free(log->l_xbuf); 1573 #ifdef XFS_LOG_TRACE 1574 if (log->l_trace != NULL) { 1575 ktrace_free(log->l_trace); 1576 } 1577 if (log->l_grant_trace != NULL) { 1578 ktrace_free(log->l_grant_trace); 1579 } 1580 #endif 1581 log->l_mp->m_log = NULL; 1582 kmem_free(log, sizeof(xlog_t)); 1583 } /* xlog_dealloc_log */ 1584 1585 /* 1586 * Update counters atomically now that memcpy is done. 1587 */ 1588 /* ARGSUSED */ 1589 static inline void 1590 xlog_state_finish_copy(xlog_t *log, 1591 xlog_in_core_t *iclog, 1592 int record_cnt, 1593 int copy_bytes) 1594 { 1595 SPLDECL(s); 1596 1597 s = LOG_LOCK(log); 1598 1599 iclog->ic_header.h_num_logops += record_cnt; 1600 iclog->ic_offset += copy_bytes; 1601 1602 LOG_UNLOCK(log, s); 1603 } /* xlog_state_finish_copy */ 1604 1605 1606 1607 1608 /* 1609 * print out info relating to regions written which consume 1610 * the reservation 1611 */ 1612 STATIC void 1613 xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) 1614 { 1615 uint i; 1616 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); 1617 1618 /* match with XLOG_REG_TYPE_* in xfs_log.h */ 1619 static char *res_type_str[XLOG_REG_TYPE_MAX] = { 1620 "bformat", 1621 "bchunk", 1622 "efi_format", 1623 "efd_format", 1624 "iformat", 1625 "icore", 1626 "iext", 1627 "ibroot", 1628 "ilocal", 1629 "iattr_ext", 1630 "iattr_broot", 1631 "iattr_local", 1632 "qformat", 1633 "dquot", 1634 "quotaoff", 1635 "LR header", 1636 "unmount", 1637 "commit", 1638 "trans header" 1639 }; 1640 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { 1641 "SETATTR_NOT_SIZE", 1642 "SETATTR_SIZE", 1643 "INACTIVE", 1644 "CREATE", 1645 "CREATE_TRUNC", 1646 "TRUNCATE_FILE", 1647 "REMOVE", 1648 "LINK", 1649 "RENAME", 1650 "MKDIR", 1651 "RMDIR", 1652 "SYMLINK", 1653 "SET_DMATTRS", 1654 "GROWFS", 1655 "STRAT_WRITE", 1656 "DIOSTRAT", 1657 "WRITE_SYNC", 1658 "WRITEID", 1659 "ADDAFORK", 1660 "ATTRINVAL", 1661 "ATRUNCATE", 1662 "ATTR_SET", 1663 "ATTR_RM", 1664 "ATTR_FLAG", 1665 "CLEAR_AGI_BUCKET", 1666 "QM_SBCHANGE", 1667 "DUMMY1", 1668 "DUMMY2", 1669 "QM_QUOTAOFF", 1670 "QM_DQALLOC", 1671 "QM_SETQLIM", 1672 "QM_DQCLUSTER", 1673 "QM_QINOCREATE", 1674 "QM_QUOTAOFF_END", 1675 "SB_UNIT", 1676 "FSYNC_TS", 1677 "GROWFSRT_ALLOC", 1678 "GROWFSRT_ZERO", 1679 "GROWFSRT_FREE", 1680 "SWAPEXT" 1681 }; 1682 1683 xfs_fs_cmn_err(CE_WARN, mp, 1684 "xfs_log_write: reservation summary:\n" 1685 " trans type = %s (%u)\n" 1686 " unit res = %d bytes\n" 1687 " current res = %d bytes\n" 1688 " total reg = %u bytes (o/flow = %u bytes)\n" 1689 " ophdrs = %u (ophdr space = %u bytes)\n" 1690 " ophdr + reg = %u bytes\n" 1691 " num regions = %u\n", 1692 ((ticket->t_trans_type <= 0 || 1693 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? 1694 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), 1695 ticket->t_trans_type, 1696 ticket->t_unit_res, 1697 ticket->t_curr_res, 1698 ticket->t_res_arr_sum, ticket->t_res_o_flow, 1699 ticket->t_res_num_ophdrs, ophdr_spc, 1700 ticket->t_res_arr_sum + 1701 ticket->t_res_o_flow + ophdr_spc, 1702 ticket->t_res_num); 1703 1704 for (i = 0; i < ticket->t_res_num; i++) { 1705 uint r_type = ticket->t_res_arr[i].r_type; 1706 cmn_err(CE_WARN, 1707 "region[%u]: %s - %u bytes\n", 1708 i, 1709 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? 1710 "bad-rtype" : res_type_str[r_type-1]), 1711 ticket->t_res_arr[i].r_len); 1712 } 1713 } 1714 1715 /* 1716 * Write some region out to in-core log 1717 * 1718 * This will be called when writing externally provided regions or when 1719 * writing out a commit record for a given transaction. 1720 * 1721 * General algorithm: 1722 * 1. Find total length of this write. This may include adding to the 1723 * lengths passed in. 1724 * 2. Check whether we violate the tickets reservation. 1725 * 3. While writing to this iclog 1726 * A. Reserve as much space in this iclog as can get 1727 * B. If this is first write, save away start lsn 1728 * C. While writing this region: 1729 * 1. If first write of transaction, write start record 1730 * 2. Write log operation header (header per region) 1731 * 3. Find out if we can fit entire region into this iclog 1732 * 4. Potentially, verify destination memcpy ptr 1733 * 5. Memcpy (partial) region 1734 * 6. If partial copy, release iclog; otherwise, continue 1735 * copying more regions into current iclog 1736 * 4. Mark want sync bit (in simulation mode) 1737 * 5. Release iclog for potential flush to on-disk log. 1738 * 1739 * ERRORS: 1740 * 1. Panic if reservation is overrun. This should never happen since 1741 * reservation amounts are generated internal to the filesystem. 1742 * NOTES: 1743 * 1. Tickets are single threaded data structures. 1744 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the 1745 * syncing routine. When a single log_write region needs to span 1746 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set 1747 * on all log operation writes which don't contain the end of the 1748 * region. The XLOG_END_TRANS bit is used for the in-core log 1749 * operation which contains the end of the continued log_write region. 1750 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, 1751 * we don't really know exactly how much space will be used. As a result, 1752 * we don't update ic_offset until the end when we know exactly how many 1753 * bytes have been written out. 1754 */ 1755 int 1756 xlog_write(xfs_mount_t * mp, 1757 xfs_log_iovec_t reg[], 1758 int nentries, 1759 xfs_log_ticket_t tic, 1760 xfs_lsn_t *start_lsn, 1761 xlog_in_core_t **commit_iclog, 1762 uint flags) 1763 { 1764 xlog_t *log = mp->m_log; 1765 xlog_ticket_t *ticket = (xlog_ticket_t *)tic; 1766 xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ 1767 xlog_op_header_t *logop_head; /* ptr to log operation header */ 1768 __psint_t ptr; /* copy address into data region */ 1769 int len; /* # xlog_write() bytes 2 still copy */ 1770 int index; /* region index currently copying */ 1771 int log_offset; /* offset (from 0) into data region */ 1772 int start_rec_copy; /* # bytes to copy for start record */ 1773 int partial_copy; /* did we split a region? */ 1774 int partial_copy_len;/* # bytes copied if split region */ 1775 int need_copy; /* # bytes need to memcpy this region */ 1776 int copy_len; /* # bytes actually memcpy'ing */ 1777 int copy_off; /* # bytes from entry start */ 1778 int contwr; /* continued write of in-core log? */ 1779 int error; 1780 int record_cnt = 0, data_cnt = 0; 1781 1782 partial_copy_len = partial_copy = 0; 1783 1784 /* Calculate potential maximum space. Each region gets its own 1785 * xlog_op_header_t and may need to be double word aligned. 1786 */ 1787 len = 0; 1788 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ 1789 len += sizeof(xlog_op_header_t); 1790 ticket->t_res_num_ophdrs++; 1791 } 1792 1793 for (index = 0; index < nentries; index++) { 1794 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ 1795 ticket->t_res_num_ophdrs++; 1796 len += reg[index].i_len; 1797 xlog_tic_add_region(ticket, reg[index].i_len, reg[index].i_type); 1798 } 1799 contwr = *start_lsn = 0; 1800 1801 if (ticket->t_curr_res < len) { 1802 xlog_print_tic_res(mp, ticket); 1803 #ifdef DEBUG 1804 xlog_panic( 1805 "xfs_log_write: reservation ran out. Need to up reservation"); 1806 #else 1807 /* Customer configurable panic */ 1808 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, 1809 "xfs_log_write: reservation ran out. Need to up reservation"); 1810 /* If we did not panic, shutdown the filesystem */ 1811 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); 1812 #endif 1813 } else 1814 ticket->t_curr_res -= len; 1815 1816 for (index = 0; index < nentries; ) { 1817 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, 1818 &contwr, &log_offset))) 1819 return error; 1820 1821 ASSERT(log_offset <= iclog->ic_size - 1); 1822 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); 1823 1824 /* start_lsn is the first lsn written to. That's all we need. */ 1825 if (! *start_lsn) 1826 *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 1827 1828 /* This loop writes out as many regions as can fit in the amount 1829 * of space which was allocated by xlog_state_get_iclog_space(). 1830 */ 1831 while (index < nentries) { 1832 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); 1833 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); 1834 start_rec_copy = 0; 1835 1836 /* If first write for transaction, insert start record. 1837 * We can't be trying to commit if we are inited. We can't 1838 * have any "partial_copy" if we are inited. 1839 */ 1840 if (ticket->t_flags & XLOG_TIC_INITED) { 1841 logop_head = (xlog_op_header_t *)ptr; 1842 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1843 logop_head->oh_clientid = ticket->t_clientid; 1844 logop_head->oh_len = 0; 1845 logop_head->oh_flags = XLOG_START_TRANS; 1846 logop_head->oh_res2 = 0; 1847 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ 1848 record_cnt++; 1849 1850 start_rec_copy = sizeof(xlog_op_header_t); 1851 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); 1852 } 1853 1854 /* Copy log operation header directly into data section */ 1855 logop_head = (xlog_op_header_t *)ptr; 1856 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1857 logop_head->oh_clientid = ticket->t_clientid; 1858 logop_head->oh_res2 = 0; 1859 1860 /* header copied directly */ 1861 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); 1862 1863 /* are we copying a commit or unmount record? */ 1864 logop_head->oh_flags = flags; 1865 1866 /* 1867 * We've seen logs corrupted with bad transaction client 1868 * ids. This makes sure that XFS doesn't generate them on. 1869 * Turn this into an EIO and shut down the filesystem. 1870 */ 1871 switch (logop_head->oh_clientid) { 1872 case XFS_TRANSACTION: 1873 case XFS_VOLUME: 1874 case XFS_LOG: 1875 break; 1876 default: 1877 xfs_fs_cmn_err(CE_WARN, mp, 1878 "Bad XFS transaction clientid 0x%x in ticket 0x%p", 1879 logop_head->oh_clientid, tic); 1880 return XFS_ERROR(EIO); 1881 } 1882 1883 /* Partial write last time? => (partial_copy != 0) 1884 * need_copy is the amount we'd like to copy if everything could 1885 * fit in the current memcpy. 1886 */ 1887 need_copy = reg[index].i_len - partial_copy_len; 1888 1889 copy_off = partial_copy_len; 1890 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ 1891 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy); 1892 if (partial_copy) 1893 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); 1894 partial_copy_len = partial_copy = 0; 1895 } else { /* partial write */ 1896 copy_len = iclog->ic_size - log_offset; 1897 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len); 1898 logop_head->oh_flags |= XLOG_CONTINUE_TRANS; 1899 if (partial_copy) 1900 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; 1901 partial_copy_len += copy_len; 1902 partial_copy++; 1903 len += sizeof(xlog_op_header_t); /* from splitting of region */ 1904 /* account for new log op header */ 1905 ticket->t_curr_res -= sizeof(xlog_op_header_t); 1906 ticket->t_res_num_ophdrs++; 1907 } 1908 xlog_verify_dest_ptr(log, ptr); 1909 1910 /* copy region */ 1911 ASSERT(copy_len >= 0); 1912 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); 1913 xlog_write_adv_cnt(ptr, len, log_offset, copy_len); 1914 1915 /* make copy_len total bytes copied, including headers */ 1916 copy_len += start_rec_copy + sizeof(xlog_op_header_t); 1917 record_cnt++; 1918 data_cnt += contwr ? copy_len : 0; 1919 if (partial_copy) { /* copied partial region */ 1920 /* already marked WANT_SYNC by xlog_state_get_iclog_space */ 1921 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1922 record_cnt = data_cnt = 0; 1923 if ((error = xlog_state_release_iclog(log, iclog))) 1924 return error; 1925 break; /* don't increment index */ 1926 } else { /* copied entire region */ 1927 index++; 1928 partial_copy_len = partial_copy = 0; 1929 1930 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { 1931 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1932 record_cnt = data_cnt = 0; 1933 xlog_state_want_sync(log, iclog); 1934 if (commit_iclog) { 1935 ASSERT(flags & XLOG_COMMIT_TRANS); 1936 *commit_iclog = iclog; 1937 } else if ((error = xlog_state_release_iclog(log, iclog))) 1938 return error; 1939 if (index == nentries) 1940 return 0; /* we are done */ 1941 else 1942 break; 1943 } 1944 } /* if (partial_copy) */ 1945 } /* while (index < nentries) */ 1946 } /* for (index = 0; index < nentries; ) */ 1947 ASSERT(len == 0); 1948 1949 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1950 if (commit_iclog) { 1951 ASSERT(flags & XLOG_COMMIT_TRANS); 1952 *commit_iclog = iclog; 1953 return 0; 1954 } 1955 return xlog_state_release_iclog(log, iclog); 1956 } /* xlog_write */ 1957 1958 1959 /***************************************************************************** 1960 * 1961 * State Machine functions 1962 * 1963 ***************************************************************************** 1964 */ 1965 1966 /* Clean iclogs starting from the head. This ordering must be 1967 * maintained, so an iclog doesn't become ACTIVE beyond one that 1968 * is SYNCING. This is also required to maintain the notion that we use 1969 * a counting semaphore to hold off would be writers to the log when every 1970 * iclog is trying to sync to disk. 1971 * 1972 * State Change: DIRTY -> ACTIVE 1973 */ 1974 STATIC void 1975 xlog_state_clean_log(xlog_t *log) 1976 { 1977 xlog_in_core_t *iclog; 1978 int changed = 0; 1979 1980 iclog = log->l_iclog; 1981 do { 1982 if (iclog->ic_state == XLOG_STATE_DIRTY) { 1983 iclog->ic_state = XLOG_STATE_ACTIVE; 1984 iclog->ic_offset = 0; 1985 iclog->ic_callback = NULL; /* don't need to free */ 1986 /* 1987 * If the number of ops in this iclog indicate it just 1988 * contains the dummy transaction, we can 1989 * change state into IDLE (the second time around). 1990 * Otherwise we should change the state into 1991 * NEED a dummy. 1992 * We don't need to cover the dummy. 1993 */ 1994 if (!changed && 1995 (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) { 1996 changed = 1; 1997 } else { 1998 /* 1999 * We have two dirty iclogs so start over 2000 * This could also be num of ops indicates 2001 * this is not the dummy going out. 2002 */ 2003 changed = 2; 2004 } 2005 iclog->ic_header.h_num_logops = 0; 2006 memset(iclog->ic_header.h_cycle_data, 0, 2007 sizeof(iclog->ic_header.h_cycle_data)); 2008 iclog->ic_header.h_lsn = 0; 2009 } else if (iclog->ic_state == XLOG_STATE_ACTIVE) 2010 /* do nothing */; 2011 else 2012 break; /* stop cleaning */ 2013 iclog = iclog->ic_next; 2014 } while (iclog != log->l_iclog); 2015 2016 /* log is locked when we are called */ 2017 /* 2018 * Change state for the dummy log recording. 2019 * We usually go to NEED. But we go to NEED2 if the changed indicates 2020 * we are done writing the dummy record. 2021 * If we are done with the second dummy recored (DONE2), then 2022 * we go to IDLE. 2023 */ 2024 if (changed) { 2025 switch (log->l_covered_state) { 2026 case XLOG_STATE_COVER_IDLE: 2027 case XLOG_STATE_COVER_NEED: 2028 case XLOG_STATE_COVER_NEED2: 2029 log->l_covered_state = XLOG_STATE_COVER_NEED; 2030 break; 2031 2032 case XLOG_STATE_COVER_DONE: 2033 if (changed == 1) 2034 log->l_covered_state = XLOG_STATE_COVER_NEED2; 2035 else 2036 log->l_covered_state = XLOG_STATE_COVER_NEED; 2037 break; 2038 2039 case XLOG_STATE_COVER_DONE2: 2040 if (changed == 1) 2041 log->l_covered_state = XLOG_STATE_COVER_IDLE; 2042 else 2043 log->l_covered_state = XLOG_STATE_COVER_NEED; 2044 break; 2045 2046 default: 2047 ASSERT(0); 2048 } 2049 } 2050 } /* xlog_state_clean_log */ 2051 2052 STATIC xfs_lsn_t 2053 xlog_get_lowest_lsn( 2054 xlog_t *log) 2055 { 2056 xlog_in_core_t *lsn_log; 2057 xfs_lsn_t lowest_lsn, lsn; 2058 2059 lsn_log = log->l_iclog; 2060 lowest_lsn = 0; 2061 do { 2062 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { 2063 lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT); 2064 if ((lsn && !lowest_lsn) || 2065 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { 2066 lowest_lsn = lsn; 2067 } 2068 } 2069 lsn_log = lsn_log->ic_next; 2070 } while (lsn_log != log->l_iclog); 2071 return lowest_lsn; 2072 } 2073 2074 2075 STATIC void 2076 xlog_state_do_callback( 2077 xlog_t *log, 2078 int aborted, 2079 xlog_in_core_t *ciclog) 2080 { 2081 xlog_in_core_t *iclog; 2082 xlog_in_core_t *first_iclog; /* used to know when we've 2083 * processed all iclogs once */ 2084 xfs_log_callback_t *cb, *cb_next; 2085 int flushcnt = 0; 2086 xfs_lsn_t lowest_lsn; 2087 int ioerrors; /* counter: iclogs with errors */ 2088 int loopdidcallbacks; /* flag: inner loop did callbacks*/ 2089 int funcdidcallbacks; /* flag: function did callbacks */ 2090 int repeats; /* for issuing console warnings if 2091 * looping too many times */ 2092 SPLDECL(s); 2093 2094 s = LOG_LOCK(log); 2095 first_iclog = iclog = log->l_iclog; 2096 ioerrors = 0; 2097 funcdidcallbacks = 0; 2098 repeats = 0; 2099 2100 do { 2101 /* 2102 * Scan all iclogs starting with the one pointed to by the 2103 * log. Reset this starting point each time the log is 2104 * unlocked (during callbacks). 2105 * 2106 * Keep looping through iclogs until one full pass is made 2107 * without running any callbacks. 2108 */ 2109 first_iclog = log->l_iclog; 2110 iclog = log->l_iclog; 2111 loopdidcallbacks = 0; 2112 repeats++; 2113 2114 do { 2115 2116 /* skip all iclogs in the ACTIVE & DIRTY states */ 2117 if (iclog->ic_state & 2118 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { 2119 iclog = iclog->ic_next; 2120 continue; 2121 } 2122 2123 /* 2124 * Between marking a filesystem SHUTDOWN and stopping 2125 * the log, we do flush all iclogs to disk (if there 2126 * wasn't a log I/O error). So, we do want things to 2127 * go smoothly in case of just a SHUTDOWN w/o a 2128 * LOG_IO_ERROR. 2129 */ 2130 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 2131 /* 2132 * Can only perform callbacks in order. Since 2133 * this iclog is not in the DONE_SYNC/ 2134 * DO_CALLBACK state, we skip the rest and 2135 * just try to clean up. If we set our iclog 2136 * to DO_CALLBACK, we will not process it when 2137 * we retry since a previous iclog is in the 2138 * CALLBACK and the state cannot change since 2139 * we are holding the LOG_LOCK. 2140 */ 2141 if (!(iclog->ic_state & 2142 (XLOG_STATE_DONE_SYNC | 2143 XLOG_STATE_DO_CALLBACK))) { 2144 if (ciclog && (ciclog->ic_state == 2145 XLOG_STATE_DONE_SYNC)) { 2146 ciclog->ic_state = XLOG_STATE_DO_CALLBACK; 2147 } 2148 break; 2149 } 2150 /* 2151 * We now have an iclog that is in either the 2152 * DO_CALLBACK or DONE_SYNC states. The other 2153 * states (WANT_SYNC, SYNCING, or CALLBACK were 2154 * caught by the above if and are going to 2155 * clean (i.e. we aren't doing their callbacks) 2156 * see the above if. 2157 */ 2158 2159 /* 2160 * We will do one more check here to see if we 2161 * have chased our tail around. 2162 */ 2163 2164 lowest_lsn = xlog_get_lowest_lsn(log); 2165 if (lowest_lsn && ( 2166 XFS_LSN_CMP( 2167 lowest_lsn, 2168 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2169 )<0)) { 2170 iclog = iclog->ic_next; 2171 continue; /* Leave this iclog for 2172 * another thread */ 2173 } 2174 2175 iclog->ic_state = XLOG_STATE_CALLBACK; 2176 2177 LOG_UNLOCK(log, s); 2178 2179 /* l_last_sync_lsn field protected by 2180 * GRANT_LOCK. Don't worry about iclog's lsn. 2181 * No one else can be here except us. 2182 */ 2183 s = GRANT_LOCK(log); 2184 ASSERT(XFS_LSN_CMP( 2185 log->l_last_sync_lsn, 2186 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2187 )<=0); 2188 log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2189 GRANT_UNLOCK(log, s); 2190 2191 /* 2192 * Keep processing entries in the callback list 2193 * until we come around and it is empty. We 2194 * need to atomically see that the list is 2195 * empty and change the state to DIRTY so that 2196 * we don't miss any more callbacks being added. 2197 */ 2198 s = LOG_LOCK(log); 2199 } else { 2200 ioerrors++; 2201 } 2202 cb = iclog->ic_callback; 2203 2204 while (cb) { 2205 iclog->ic_callback_tail = &(iclog->ic_callback); 2206 iclog->ic_callback = NULL; 2207 LOG_UNLOCK(log, s); 2208 2209 /* perform callbacks in the order given */ 2210 for (; cb; cb = cb_next) { 2211 cb_next = cb->cb_next; 2212 cb->cb_func(cb->cb_arg, aborted); 2213 } 2214 s = LOG_LOCK(log); 2215 cb = iclog->ic_callback; 2216 } 2217 2218 loopdidcallbacks++; 2219 funcdidcallbacks++; 2220 2221 ASSERT(iclog->ic_callback == NULL); 2222 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) 2223 iclog->ic_state = XLOG_STATE_DIRTY; 2224 2225 /* 2226 * Transition from DIRTY to ACTIVE if applicable. 2227 * NOP if STATE_IOERROR. 2228 */ 2229 xlog_state_clean_log(log); 2230 2231 /* wake up threads waiting in xfs_log_force() */ 2232 sv_broadcast(&iclog->ic_forcesema); 2233 2234 iclog = iclog->ic_next; 2235 } while (first_iclog != iclog); 2236 2237 if (repeats > 5000) { 2238 flushcnt += repeats; 2239 repeats = 0; 2240 xfs_fs_cmn_err(CE_WARN, log->l_mp, 2241 "%s: possible infinite loop (%d iterations)", 2242 __FUNCTION__, flushcnt); 2243 } 2244 } while (!ioerrors && loopdidcallbacks); 2245 2246 /* 2247 * make one last gasp attempt to see if iclogs are being left in 2248 * limbo.. 2249 */ 2250 #ifdef DEBUG 2251 if (funcdidcallbacks) { 2252 first_iclog = iclog = log->l_iclog; 2253 do { 2254 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); 2255 /* 2256 * Terminate the loop if iclogs are found in states 2257 * which will cause other threads to clean up iclogs. 2258 * 2259 * SYNCING - i/o completion will go through logs 2260 * DONE_SYNC - interrupt thread should be waiting for 2261 * LOG_LOCK 2262 * IOERROR - give up hope all ye who enter here 2263 */ 2264 if (iclog->ic_state == XLOG_STATE_WANT_SYNC || 2265 iclog->ic_state == XLOG_STATE_SYNCING || 2266 iclog->ic_state == XLOG_STATE_DONE_SYNC || 2267 iclog->ic_state == XLOG_STATE_IOERROR ) 2268 break; 2269 iclog = iclog->ic_next; 2270 } while (first_iclog != iclog); 2271 } 2272 #endif 2273 2274 flushcnt = 0; 2275 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { 2276 flushcnt = log->l_flushcnt; 2277 log->l_flushcnt = 0; 2278 } 2279 LOG_UNLOCK(log, s); 2280 while (flushcnt--) 2281 vsema(&log->l_flushsema); 2282 } /* xlog_state_do_callback */ 2283 2284 2285 /* 2286 * Finish transitioning this iclog to the dirty state. 2287 * 2288 * Make sure that we completely execute this routine only when this is 2289 * the last call to the iclog. There is a good chance that iclog flushes, 2290 * when we reach the end of the physical log, get turned into 2 separate 2291 * calls to bwrite. Hence, one iclog flush could generate two calls to this 2292 * routine. By using the reference count bwritecnt, we guarantee that only 2293 * the second completion goes through. 2294 * 2295 * Callbacks could take time, so they are done outside the scope of the 2296 * global state machine log lock. Assume that the calls to cvsema won't 2297 * take a long time. At least we know it won't sleep. 2298 */ 2299 void 2300 xlog_state_done_syncing( 2301 xlog_in_core_t *iclog, 2302 int aborted) 2303 { 2304 xlog_t *log = iclog->ic_log; 2305 SPLDECL(s); 2306 2307 s = LOG_LOCK(log); 2308 2309 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || 2310 iclog->ic_state == XLOG_STATE_IOERROR); 2311 ASSERT(iclog->ic_refcnt == 0); 2312 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); 2313 2314 2315 /* 2316 * If we got an error, either on the first buffer, or in the case of 2317 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, 2318 * and none should ever be attempted to be written to disk 2319 * again. 2320 */ 2321 if (iclog->ic_state != XLOG_STATE_IOERROR) { 2322 if (--iclog->ic_bwritecnt == 1) { 2323 LOG_UNLOCK(log, s); 2324 return; 2325 } 2326 iclog->ic_state = XLOG_STATE_DONE_SYNC; 2327 } 2328 2329 /* 2330 * Someone could be sleeping prior to writing out the next 2331 * iclog buffer, we wake them all, one will get to do the 2332 * I/O, the others get to wait for the result. 2333 */ 2334 sv_broadcast(&iclog->ic_writesema); 2335 LOG_UNLOCK(log, s); 2336 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ 2337 } /* xlog_state_done_syncing */ 2338 2339 2340 /* 2341 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must 2342 * sleep. The flush semaphore is set to the number of in-core buffers and 2343 * decremented around disk syncing. Therefore, if all buffers are syncing, 2344 * this semaphore will cause new writes to sleep until a sync completes. 2345 * Otherwise, this code just does p() followed by v(). This approximates 2346 * a sleep/wakeup except we can't race. 2347 * 2348 * The in-core logs are used in a circular fashion. They are not used 2349 * out-of-order even when an iclog past the head is free. 2350 * 2351 * return: 2352 * * log_offset where xlog_write() can start writing into the in-core 2353 * log's data space. 2354 * * in-core log pointer to which xlog_write() should write. 2355 * * boolean indicating this is a continued write to an in-core log. 2356 * If this is the last write, then the in-core log's offset field 2357 * needs to be incremented, depending on the amount of data which 2358 * is copied. 2359 */ 2360 int 2361 xlog_state_get_iclog_space(xlog_t *log, 2362 int len, 2363 xlog_in_core_t **iclogp, 2364 xlog_ticket_t *ticket, 2365 int *continued_write, 2366 int *logoffsetp) 2367 { 2368 SPLDECL(s); 2369 int log_offset; 2370 xlog_rec_header_t *head; 2371 xlog_in_core_t *iclog; 2372 int error; 2373 2374 restart: 2375 s = LOG_LOCK(log); 2376 if (XLOG_FORCED_SHUTDOWN(log)) { 2377 LOG_UNLOCK(log, s); 2378 return XFS_ERROR(EIO); 2379 } 2380 2381 iclog = log->l_iclog; 2382 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { 2383 log->l_flushcnt++; 2384 LOG_UNLOCK(log, s); 2385 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); 2386 XFS_STATS_INC(xs_log_noiclogs); 2387 /* Ensure that log writes happen */ 2388 psema(&log->l_flushsema, PINOD); 2389 goto restart; 2390 } 2391 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2392 head = &iclog->ic_header; 2393 2394 iclog->ic_refcnt++; /* prevents sync */ 2395 log_offset = iclog->ic_offset; 2396 2397 /* On the 1st write to an iclog, figure out lsn. This works 2398 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are 2399 * committing to. If the offset is set, that's how many blocks 2400 * must be written. 2401 */ 2402 if (log_offset == 0) { 2403 ticket->t_curr_res -= log->l_iclog_hsize; 2404 xlog_tic_add_region(ticket, 2405 log->l_iclog_hsize, 2406 XLOG_REG_TYPE_LRHEADER); 2407 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle); 2408 ASSIGN_LSN(head->h_lsn, log); 2409 ASSERT(log->l_curr_block >= 0); 2410 } 2411 2412 /* If there is enough room to write everything, then do it. Otherwise, 2413 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC 2414 * bit is on, so this will get flushed out. Don't update ic_offset 2415 * until you know exactly how many bytes get copied. Therefore, wait 2416 * until later to update ic_offset. 2417 * 2418 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's 2419 * can fit into remaining data section. 2420 */ 2421 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { 2422 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2423 2424 /* If I'm the only one writing to this iclog, sync it to disk */ 2425 if (iclog->ic_refcnt == 1) { 2426 LOG_UNLOCK(log, s); 2427 if ((error = xlog_state_release_iclog(log, iclog))) 2428 return error; 2429 } else { 2430 iclog->ic_refcnt--; 2431 LOG_UNLOCK(log, s); 2432 } 2433 goto restart; 2434 } 2435 2436 /* Do we have enough room to write the full amount in the remainder 2437 * of this iclog? Or must we continue a write on the next iclog and 2438 * mark this iclog as completely taken? In the case where we switch 2439 * iclogs (to mark it taken), this particular iclog will release/sync 2440 * to disk in xlog_write(). 2441 */ 2442 if (len <= iclog->ic_size - iclog->ic_offset) { 2443 *continued_write = 0; 2444 iclog->ic_offset += len; 2445 } else { 2446 *continued_write = 1; 2447 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2448 } 2449 *iclogp = iclog; 2450 2451 ASSERT(iclog->ic_offset <= iclog->ic_size); 2452 LOG_UNLOCK(log, s); 2453 2454 *logoffsetp = log_offset; 2455 return 0; 2456 } /* xlog_state_get_iclog_space */ 2457 2458 /* 2459 * Atomically get the log space required for a log ticket. 2460 * 2461 * Once a ticket gets put onto the reserveq, it will only return after 2462 * the needed reservation is satisfied. 2463 */ 2464 STATIC int 2465 xlog_grant_log_space(xlog_t *log, 2466 xlog_ticket_t *tic) 2467 { 2468 int free_bytes; 2469 int need_bytes; 2470 SPLDECL(s); 2471 #ifdef DEBUG 2472 xfs_lsn_t tail_lsn; 2473 #endif 2474 2475 2476 #ifdef DEBUG 2477 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2478 panic("grant Recovery problem"); 2479 #endif 2480 2481 /* Is there space or do we need to sleep? */ 2482 s = GRANT_LOCK(log); 2483 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); 2484 2485 /* something is already sleeping; insert new transaction at end */ 2486 if (log->l_reserve_headq) { 2487 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2488 xlog_trace_loggrant(log, tic, 2489 "xlog_grant_log_space: sleep 1"); 2490 /* 2491 * Gotta check this before going to sleep, while we're 2492 * holding the grant lock. 2493 */ 2494 if (XLOG_FORCED_SHUTDOWN(log)) 2495 goto error_return; 2496 2497 XFS_STATS_INC(xs_sleep_logspace); 2498 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2499 /* 2500 * If we got an error, and the filesystem is shutting down, 2501 * we'll catch it down below. So just continue... 2502 */ 2503 xlog_trace_loggrant(log, tic, 2504 "xlog_grant_log_space: wake 1"); 2505 s = GRANT_LOCK(log); 2506 } 2507 if (tic->t_flags & XFS_LOG_PERM_RESERV) 2508 need_bytes = tic->t_unit_res*tic->t_ocnt; 2509 else 2510 need_bytes = tic->t_unit_res; 2511 2512 redo: 2513 if (XLOG_FORCED_SHUTDOWN(log)) 2514 goto error_return; 2515 2516 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, 2517 log->l_grant_reserve_bytes); 2518 if (free_bytes < need_bytes) { 2519 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2520 xlog_ins_ticketq(&log->l_reserve_headq, tic); 2521 xlog_trace_loggrant(log, tic, 2522 "xlog_grant_log_space: sleep 2"); 2523 XFS_STATS_INC(xs_sleep_logspace); 2524 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2525 2526 if (XLOG_FORCED_SHUTDOWN(log)) { 2527 s = GRANT_LOCK(log); 2528 goto error_return; 2529 } 2530 2531 xlog_trace_loggrant(log, tic, 2532 "xlog_grant_log_space: wake 2"); 2533 xlog_grant_push_ail(log->l_mp, need_bytes); 2534 s = GRANT_LOCK(log); 2535 goto redo; 2536 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2537 xlog_del_ticketq(&log->l_reserve_headq, tic); 2538 2539 /* we've got enough space */ 2540 xlog_grant_add_space(log, need_bytes); 2541 #ifdef DEBUG 2542 tail_lsn = log->l_tail_lsn; 2543 /* 2544 * Check to make sure the grant write head didn't just over lap the 2545 * tail. If the cycles are the same, we can't be overlapping. 2546 * Otherwise, make sure that the cycles differ by exactly one and 2547 * check the byte count. 2548 */ 2549 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2550 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2551 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2552 } 2553 #endif 2554 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); 2555 xlog_verify_grant_head(log, 1); 2556 GRANT_UNLOCK(log, s); 2557 return 0; 2558 2559 error_return: 2560 if (tic->t_flags & XLOG_TIC_IN_Q) 2561 xlog_del_ticketq(&log->l_reserve_headq, tic); 2562 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); 2563 /* 2564 * If we are failing, make sure the ticket doesn't have any 2565 * current reservations. We don't want to add this back when 2566 * the ticket/transaction gets cancelled. 2567 */ 2568 tic->t_curr_res = 0; 2569 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2570 GRANT_UNLOCK(log, s); 2571 return XFS_ERROR(EIO); 2572 } /* xlog_grant_log_space */ 2573 2574 2575 /* 2576 * Replenish the byte reservation required by moving the grant write head. 2577 * 2578 * 2579 */ 2580 STATIC int 2581 xlog_regrant_write_log_space(xlog_t *log, 2582 xlog_ticket_t *tic) 2583 { 2584 SPLDECL(s); 2585 int free_bytes, need_bytes; 2586 xlog_ticket_t *ntic; 2587 #ifdef DEBUG 2588 xfs_lsn_t tail_lsn; 2589 #endif 2590 2591 tic->t_curr_res = tic->t_unit_res; 2592 xlog_tic_reset_res(tic); 2593 2594 if (tic->t_cnt > 0) 2595 return 0; 2596 2597 #ifdef DEBUG 2598 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2599 panic("regrant Recovery problem"); 2600 #endif 2601 2602 s = GRANT_LOCK(log); 2603 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); 2604 2605 if (XLOG_FORCED_SHUTDOWN(log)) 2606 goto error_return; 2607 2608 /* If there are other waiters on the queue then give them a 2609 * chance at logspace before us. Wake up the first waiters, 2610 * if we do not wake up all the waiters then go to sleep waiting 2611 * for more free space, otherwise try to get some space for 2612 * this transaction. 2613 */ 2614 2615 if ((ntic = log->l_write_headq)) { 2616 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2617 log->l_grant_write_bytes); 2618 do { 2619 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); 2620 2621 if (free_bytes < ntic->t_unit_res) 2622 break; 2623 free_bytes -= ntic->t_unit_res; 2624 sv_signal(&ntic->t_sema); 2625 ntic = ntic->t_next; 2626 } while (ntic != log->l_write_headq); 2627 2628 if (ntic != log->l_write_headq) { 2629 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2630 xlog_ins_ticketq(&log->l_write_headq, tic); 2631 2632 xlog_trace_loggrant(log, tic, 2633 "xlog_regrant_write_log_space: sleep 1"); 2634 XFS_STATS_INC(xs_sleep_logspace); 2635 sv_wait(&tic->t_sema, PINOD|PLTWAIT, 2636 &log->l_grant_lock, s); 2637 2638 /* If we're shutting down, this tic is already 2639 * off the queue */ 2640 if (XLOG_FORCED_SHUTDOWN(log)) { 2641 s = GRANT_LOCK(log); 2642 goto error_return; 2643 } 2644 2645 xlog_trace_loggrant(log, tic, 2646 "xlog_regrant_write_log_space: wake 1"); 2647 xlog_grant_push_ail(log->l_mp, tic->t_unit_res); 2648 s = GRANT_LOCK(log); 2649 } 2650 } 2651 2652 need_bytes = tic->t_unit_res; 2653 2654 redo: 2655 if (XLOG_FORCED_SHUTDOWN(log)) 2656 goto error_return; 2657 2658 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2659 log->l_grant_write_bytes); 2660 if (free_bytes < need_bytes) { 2661 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2662 xlog_ins_ticketq(&log->l_write_headq, tic); 2663 XFS_STATS_INC(xs_sleep_logspace); 2664 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2665 2666 /* If we're shutting down, this tic is already off the queue */ 2667 if (XLOG_FORCED_SHUTDOWN(log)) { 2668 s = GRANT_LOCK(log); 2669 goto error_return; 2670 } 2671 2672 xlog_trace_loggrant(log, tic, 2673 "xlog_regrant_write_log_space: wake 2"); 2674 xlog_grant_push_ail(log->l_mp, need_bytes); 2675 s = GRANT_LOCK(log); 2676 goto redo; 2677 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2678 xlog_del_ticketq(&log->l_write_headq, tic); 2679 2680 /* we've got enough space */ 2681 xlog_grant_add_space_write(log, need_bytes); 2682 #ifdef DEBUG 2683 tail_lsn = log->l_tail_lsn; 2684 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2685 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2686 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2687 } 2688 #endif 2689 2690 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); 2691 xlog_verify_grant_head(log, 1); 2692 GRANT_UNLOCK(log, s); 2693 return 0; 2694 2695 2696 error_return: 2697 if (tic->t_flags & XLOG_TIC_IN_Q) 2698 xlog_del_ticketq(&log->l_reserve_headq, tic); 2699 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); 2700 /* 2701 * If we are failing, make sure the ticket doesn't have any 2702 * current reservations. We don't want to add this back when 2703 * the ticket/transaction gets cancelled. 2704 */ 2705 tic->t_curr_res = 0; 2706 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2707 GRANT_UNLOCK(log, s); 2708 return XFS_ERROR(EIO); 2709 } /* xlog_regrant_write_log_space */ 2710 2711 2712 /* The first cnt-1 times through here we don't need to 2713 * move the grant write head because the permanent 2714 * reservation has reserved cnt times the unit amount. 2715 * Release part of current permanent unit reservation and 2716 * reset current reservation to be one units worth. Also 2717 * move grant reservation head forward. 2718 */ 2719 STATIC void 2720 xlog_regrant_reserve_log_space(xlog_t *log, 2721 xlog_ticket_t *ticket) 2722 { 2723 SPLDECL(s); 2724 2725 xlog_trace_loggrant(log, ticket, 2726 "xlog_regrant_reserve_log_space: enter"); 2727 if (ticket->t_cnt > 0) 2728 ticket->t_cnt--; 2729 2730 s = GRANT_LOCK(log); 2731 xlog_grant_sub_space(log, ticket->t_curr_res); 2732 ticket->t_curr_res = ticket->t_unit_res; 2733 xlog_tic_reset_res(ticket); 2734 xlog_trace_loggrant(log, ticket, 2735 "xlog_regrant_reserve_log_space: sub current res"); 2736 xlog_verify_grant_head(log, 1); 2737 2738 /* just return if we still have some of the pre-reserved space */ 2739 if (ticket->t_cnt > 0) { 2740 GRANT_UNLOCK(log, s); 2741 return; 2742 } 2743 2744 xlog_grant_add_space_reserve(log, ticket->t_unit_res); 2745 xlog_trace_loggrant(log, ticket, 2746 "xlog_regrant_reserve_log_space: exit"); 2747 xlog_verify_grant_head(log, 0); 2748 GRANT_UNLOCK(log, s); 2749 ticket->t_curr_res = ticket->t_unit_res; 2750 xlog_tic_reset_res(ticket); 2751 } /* xlog_regrant_reserve_log_space */ 2752 2753 2754 /* 2755 * Give back the space left from a reservation. 2756 * 2757 * All the information we need to make a correct determination of space left 2758 * is present. For non-permanent reservations, things are quite easy. The 2759 * count should have been decremented to zero. We only need to deal with the 2760 * space remaining in the current reservation part of the ticket. If the 2761 * ticket contains a permanent reservation, there may be left over space which 2762 * needs to be released. A count of N means that N-1 refills of the current 2763 * reservation can be done before we need to ask for more space. The first 2764 * one goes to fill up the first current reservation. Once we run out of 2765 * space, the count will stay at zero and the only space remaining will be 2766 * in the current reservation field. 2767 */ 2768 STATIC void 2769 xlog_ungrant_log_space(xlog_t *log, 2770 xlog_ticket_t *ticket) 2771 { 2772 SPLDECL(s); 2773 2774 if (ticket->t_cnt > 0) 2775 ticket->t_cnt--; 2776 2777 s = GRANT_LOCK(log); 2778 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); 2779 2780 xlog_grant_sub_space(log, ticket->t_curr_res); 2781 2782 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); 2783 2784 /* If this is a permanent reservation ticket, we may be able to free 2785 * up more space based on the remaining count. 2786 */ 2787 if (ticket->t_cnt > 0) { 2788 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); 2789 xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); 2790 } 2791 2792 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); 2793 xlog_verify_grant_head(log, 1); 2794 GRANT_UNLOCK(log, s); 2795 xfs_log_move_tail(log->l_mp, 1); 2796 } /* xlog_ungrant_log_space */ 2797 2798 2799 /* 2800 * Atomically put back used ticket. 2801 */ 2802 void 2803 xlog_state_put_ticket(xlog_t *log, 2804 xlog_ticket_t *tic) 2805 { 2806 unsigned long s; 2807 2808 s = LOG_LOCK(log); 2809 xlog_ticket_put(log, tic); 2810 LOG_UNLOCK(log, s); 2811 } /* xlog_state_put_ticket */ 2812 2813 /* 2814 * Flush iclog to disk if this is the last reference to the given iclog and 2815 * the WANT_SYNC bit is set. 2816 * 2817 * When this function is entered, the iclog is not necessarily in the 2818 * WANT_SYNC state. It may be sitting around waiting to get filled. 2819 * 2820 * 2821 */ 2822 int 2823 xlog_state_release_iclog(xlog_t *log, 2824 xlog_in_core_t *iclog) 2825 { 2826 SPLDECL(s); 2827 int sync = 0; /* do we sync? */ 2828 2829 xlog_assign_tail_lsn(log->l_mp); 2830 2831 s = LOG_LOCK(log); 2832 2833 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2834 LOG_UNLOCK(log, s); 2835 return XFS_ERROR(EIO); 2836 } 2837 2838 ASSERT(iclog->ic_refcnt > 0); 2839 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || 2840 iclog->ic_state == XLOG_STATE_WANT_SYNC); 2841 2842 if (--iclog->ic_refcnt == 0 && 2843 iclog->ic_state == XLOG_STATE_WANT_SYNC) { 2844 sync++; 2845 iclog->ic_state = XLOG_STATE_SYNCING; 2846 INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn); 2847 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); 2848 /* cycle incremented when incrementing curr_block */ 2849 } 2850 2851 LOG_UNLOCK(log, s); 2852 2853 /* 2854 * We let the log lock go, so it's possible that we hit a log I/O 2855 * error or some other SHUTDOWN condition that marks the iclog 2856 * as XLOG_STATE_IOERROR before the bwrite. However, we know that 2857 * this iclog has consistent data, so we ignore IOERROR 2858 * flags after this point. 2859 */ 2860 if (sync) { 2861 return xlog_sync(log, iclog); 2862 } 2863 return 0; 2864 2865 } /* xlog_state_release_iclog */ 2866 2867 2868 /* 2869 * This routine will mark the current iclog in the ring as WANT_SYNC 2870 * and move the current iclog pointer to the next iclog in the ring. 2871 * When this routine is called from xlog_state_get_iclog_space(), the 2872 * exact size of the iclog has not yet been determined. All we know is 2873 * that every data block. We have run out of space in this log record. 2874 */ 2875 STATIC void 2876 xlog_state_switch_iclogs(xlog_t *log, 2877 xlog_in_core_t *iclog, 2878 int eventual_size) 2879 { 2880 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2881 if (!eventual_size) 2882 eventual_size = iclog->ic_offset; 2883 iclog->ic_state = XLOG_STATE_WANT_SYNC; 2884 INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block); 2885 log->l_prev_block = log->l_curr_block; 2886 log->l_prev_cycle = log->l_curr_cycle; 2887 2888 /* roll log?: ic_offset changed later */ 2889 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); 2890 2891 /* Round up to next log-sunit */ 2892 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 2893 log->l_mp->m_sb.sb_logsunit > 1) { 2894 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); 2895 log->l_curr_block = roundup(log->l_curr_block, sunit_bb); 2896 } 2897 2898 if (log->l_curr_block >= log->l_logBBsize) { 2899 log->l_curr_cycle++; 2900 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) 2901 log->l_curr_cycle++; 2902 log->l_curr_block -= log->l_logBBsize; 2903 ASSERT(log->l_curr_block >= 0); 2904 } 2905 ASSERT(iclog == log->l_iclog); 2906 log->l_iclog = iclog->ic_next; 2907 } /* xlog_state_switch_iclogs */ 2908 2909 2910 /* 2911 * Write out all data in the in-core log as of this exact moment in time. 2912 * 2913 * Data may be written to the in-core log during this call. However, 2914 * we don't guarantee this data will be written out. A change from past 2915 * implementation means this routine will *not* write out zero length LRs. 2916 * 2917 * Basically, we try and perform an intelligent scan of the in-core logs. 2918 * If we determine there is no flushable data, we just return. There is no 2919 * flushable data if: 2920 * 2921 * 1. the current iclog is active and has no data; the previous iclog 2922 * is in the active or dirty state. 2923 * 2. the current iclog is drity, and the previous iclog is in the 2924 * active or dirty state. 2925 * 2926 * We may sleep (call psema) if: 2927 * 2928 * 1. the current iclog is not in the active nor dirty state. 2929 * 2. the current iclog dirty, and the previous iclog is not in the 2930 * active nor dirty state. 2931 * 3. the current iclog is active, and there is another thread writing 2932 * to this particular iclog. 2933 * 4. a) the current iclog is active and has no other writers 2934 * b) when we return from flushing out this iclog, it is still 2935 * not in the active nor dirty state. 2936 */ 2937 STATIC int 2938 xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed) 2939 { 2940 xlog_in_core_t *iclog; 2941 xfs_lsn_t lsn; 2942 SPLDECL(s); 2943 2944 s = LOG_LOCK(log); 2945 2946 iclog = log->l_iclog; 2947 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2948 LOG_UNLOCK(log, s); 2949 return XFS_ERROR(EIO); 2950 } 2951 2952 /* If the head iclog is not active nor dirty, we just attach 2953 * ourselves to the head and go to sleep. 2954 */ 2955 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2956 iclog->ic_state == XLOG_STATE_DIRTY) { 2957 /* 2958 * If the head is dirty or (active and empty), then 2959 * we need to look at the previous iclog. If the previous 2960 * iclog is active or dirty we are done. There is nothing 2961 * to sync out. Otherwise, we attach ourselves to the 2962 * previous iclog and go to sleep. 2963 */ 2964 if (iclog->ic_state == XLOG_STATE_DIRTY || 2965 (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) { 2966 iclog = iclog->ic_prev; 2967 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2968 iclog->ic_state == XLOG_STATE_DIRTY) 2969 goto no_sleep; 2970 else 2971 goto maybe_sleep; 2972 } else { 2973 if (iclog->ic_refcnt == 0) { 2974 /* We are the only one with access to this 2975 * iclog. Flush it out now. There should 2976 * be a roundoff of zero to show that someone 2977 * has already taken care of the roundoff from 2978 * the previous sync. 2979 */ 2980 iclog->ic_refcnt++; 2981 lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2982 xlog_state_switch_iclogs(log, iclog, 0); 2983 LOG_UNLOCK(log, s); 2984 2985 if (xlog_state_release_iclog(log, iclog)) 2986 return XFS_ERROR(EIO); 2987 *log_flushed = 1; 2988 s = LOG_LOCK(log); 2989 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn && 2990 iclog->ic_state != XLOG_STATE_DIRTY) 2991 goto maybe_sleep; 2992 else 2993 goto no_sleep; 2994 } else { 2995 /* Someone else is writing to this iclog. 2996 * Use its call to flush out the data. However, 2997 * the other thread may not force out this LR, 2998 * so we mark it WANT_SYNC. 2999 */ 3000 xlog_state_switch_iclogs(log, iclog, 0); 3001 goto maybe_sleep; 3002 } 3003 } 3004 } 3005 3006 /* By the time we come around again, the iclog could've been filled 3007 * which would give it another lsn. If we have a new lsn, just 3008 * return because the relevant data has been flushed. 3009 */ 3010 maybe_sleep: 3011 if (flags & XFS_LOG_SYNC) { 3012 /* 3013 * We must check if we're shutting down here, before 3014 * we wait, while we're holding the LOG_LOCK. 3015 * Then we check again after waking up, in case our 3016 * sleep was disturbed by a bad news. 3017 */ 3018 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3019 LOG_UNLOCK(log, s); 3020 return XFS_ERROR(EIO); 3021 } 3022 XFS_STATS_INC(xs_log_force_sleep); 3023 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s); 3024 /* 3025 * No need to grab the log lock here since we're 3026 * only deciding whether or not to return EIO 3027 * and the memory read should be atomic. 3028 */ 3029 if (iclog->ic_state & XLOG_STATE_IOERROR) 3030 return XFS_ERROR(EIO); 3031 *log_flushed = 1; 3032 3033 } else { 3034 3035 no_sleep: 3036 LOG_UNLOCK(log, s); 3037 } 3038 return 0; 3039 } /* xlog_state_sync_all */ 3040 3041 3042 /* 3043 * Used by code which implements synchronous log forces. 3044 * 3045 * Find in-core log with lsn. 3046 * If it is in the DIRTY state, just return. 3047 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC 3048 * state and go to sleep or return. 3049 * If it is in any other state, go to sleep or return. 3050 * 3051 * If filesystem activity goes to zero, the iclog will get flushed only by 3052 * bdflush(). 3053 */ 3054 int 3055 xlog_state_sync(xlog_t *log, 3056 xfs_lsn_t lsn, 3057 uint flags, 3058 int *log_flushed) 3059 { 3060 xlog_in_core_t *iclog; 3061 int already_slept = 0; 3062 SPLDECL(s); 3063 3064 3065 try_again: 3066 s = LOG_LOCK(log); 3067 iclog = log->l_iclog; 3068 3069 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3070 LOG_UNLOCK(log, s); 3071 return XFS_ERROR(EIO); 3072 } 3073 3074 do { 3075 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) { 3076 iclog = iclog->ic_next; 3077 continue; 3078 } 3079 3080 if (iclog->ic_state == XLOG_STATE_DIRTY) { 3081 LOG_UNLOCK(log, s); 3082 return 0; 3083 } 3084 3085 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3086 /* 3087 * We sleep here if we haven't already slept (e.g. 3088 * this is the first time we've looked at the correct 3089 * iclog buf) and the buffer before us is going to 3090 * be sync'ed. The reason for this is that if we 3091 * are doing sync transactions here, by waiting for 3092 * the previous I/O to complete, we can allow a few 3093 * more transactions into this iclog before we close 3094 * it down. 3095 * 3096 * Otherwise, we mark the buffer WANT_SYNC, and bump 3097 * up the refcnt so we can release the log (which drops 3098 * the ref count). The state switch keeps new transaction 3099 * commits from using this buffer. When the current commits 3100 * finish writing into the buffer, the refcount will drop to 3101 * zero and the buffer will go out then. 3102 */ 3103 if (!already_slept && 3104 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | 3105 XLOG_STATE_SYNCING))) { 3106 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); 3107 XFS_STATS_INC(xs_log_force_sleep); 3108 sv_wait(&iclog->ic_prev->ic_writesema, PSWP, 3109 &log->l_icloglock, s); 3110 *log_flushed = 1; 3111 already_slept = 1; 3112 goto try_again; 3113 } else { 3114 iclog->ic_refcnt++; 3115 xlog_state_switch_iclogs(log, iclog, 0); 3116 LOG_UNLOCK(log, s); 3117 if (xlog_state_release_iclog(log, iclog)) 3118 return XFS_ERROR(EIO); 3119 *log_flushed = 1; 3120 s = LOG_LOCK(log); 3121 } 3122 } 3123 3124 if ((flags & XFS_LOG_SYNC) && /* sleep */ 3125 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { 3126 3127 /* 3128 * Don't wait on the forcesema if we know that we've 3129 * gotten a log write error. 3130 */ 3131 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3132 LOG_UNLOCK(log, s); 3133 return XFS_ERROR(EIO); 3134 } 3135 XFS_STATS_INC(xs_log_force_sleep); 3136 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s); 3137 /* 3138 * No need to grab the log lock here since we're 3139 * only deciding whether or not to return EIO 3140 * and the memory read should be atomic. 3141 */ 3142 if (iclog->ic_state & XLOG_STATE_IOERROR) 3143 return XFS_ERROR(EIO); 3144 *log_flushed = 1; 3145 } else { /* just return */ 3146 LOG_UNLOCK(log, s); 3147 } 3148 return 0; 3149 3150 } while (iclog != log->l_iclog); 3151 3152 LOG_UNLOCK(log, s); 3153 return 0; 3154 } /* xlog_state_sync */ 3155 3156 3157 /* 3158 * Called when we want to mark the current iclog as being ready to sync to 3159 * disk. 3160 */ 3161 void 3162 xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) 3163 { 3164 SPLDECL(s); 3165 3166 s = LOG_LOCK(log); 3167 3168 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3169 xlog_state_switch_iclogs(log, iclog, 0); 3170 } else { 3171 ASSERT(iclog->ic_state & 3172 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); 3173 } 3174 3175 LOG_UNLOCK(log, s); 3176 } /* xlog_state_want_sync */ 3177 3178 3179 3180 /***************************************************************************** 3181 * 3182 * TICKET functions 3183 * 3184 ***************************************************************************** 3185 */ 3186 3187 /* 3188 * Algorithm doesn't take into account page size. ;-( 3189 */ 3190 STATIC void 3191 xlog_state_ticket_alloc(xlog_t *log) 3192 { 3193 xlog_ticket_t *t_list; 3194 xlog_ticket_t *next; 3195 xfs_caddr_t buf; 3196 uint i = (NBPP / sizeof(xlog_ticket_t)) - 2; 3197 SPLDECL(s); 3198 3199 /* 3200 * The kmem_zalloc may sleep, so we shouldn't be holding the 3201 * global lock. XXXmiken: may want to use zone allocator. 3202 */ 3203 buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP); 3204 3205 s = LOG_LOCK(log); 3206 3207 /* Attach 1st ticket to Q, so we can keep track of allocated memory */ 3208 t_list = (xlog_ticket_t *)buf; 3209 t_list->t_next = log->l_unmount_free; 3210 log->l_unmount_free = t_list++; 3211 log->l_ticket_cnt++; 3212 log->l_ticket_tcnt++; 3213 3214 /* Next ticket becomes first ticket attached to ticket free list */ 3215 if (log->l_freelist != NULL) { 3216 ASSERT(log->l_tail != NULL); 3217 log->l_tail->t_next = t_list; 3218 } else { 3219 log->l_freelist = t_list; 3220 } 3221 log->l_ticket_cnt++; 3222 log->l_ticket_tcnt++; 3223 3224 /* Cycle through rest of alloc'ed memory, building up free Q */ 3225 for ( ; i > 0; i--) { 3226 next = t_list + 1; 3227 t_list->t_next = next; 3228 t_list = next; 3229 log->l_ticket_cnt++; 3230 log->l_ticket_tcnt++; 3231 } 3232 t_list->t_next = NULL; 3233 log->l_tail = t_list; 3234 LOG_UNLOCK(log, s); 3235 } /* xlog_state_ticket_alloc */ 3236 3237 3238 /* 3239 * Put ticket into free list 3240 * 3241 * Assumption: log lock is held around this call. 3242 */ 3243 STATIC void 3244 xlog_ticket_put(xlog_t *log, 3245 xlog_ticket_t *ticket) 3246 { 3247 sv_destroy(&ticket->t_sema); 3248 3249 /* 3250 * Don't think caching will make that much difference. It's 3251 * more important to make debug easier. 3252 */ 3253 #if 0 3254 /* real code will want to use LIFO for caching */ 3255 ticket->t_next = log->l_freelist; 3256 log->l_freelist = ticket; 3257 /* no need to clear fields */ 3258 #else 3259 /* When we debug, it is easier if tickets are cycled */ 3260 ticket->t_next = NULL; 3261 if (log->l_tail) { 3262 log->l_tail->t_next = ticket; 3263 } else { 3264 ASSERT(log->l_freelist == NULL); 3265 log->l_freelist = ticket; 3266 } 3267 log->l_tail = ticket; 3268 #endif /* DEBUG */ 3269 log->l_ticket_cnt++; 3270 } /* xlog_ticket_put */ 3271 3272 3273 /* 3274 * Grab ticket off freelist or allocation some more 3275 */ 3276 xlog_ticket_t * 3277 xlog_ticket_get(xlog_t *log, 3278 int unit_bytes, 3279 int cnt, 3280 char client, 3281 uint xflags) 3282 { 3283 xlog_ticket_t *tic; 3284 uint num_headers; 3285 SPLDECL(s); 3286 3287 alloc: 3288 if (log->l_freelist == NULL) 3289 xlog_state_ticket_alloc(log); /* potentially sleep */ 3290 3291 s = LOG_LOCK(log); 3292 if (log->l_freelist == NULL) { 3293 LOG_UNLOCK(log, s); 3294 goto alloc; 3295 } 3296 tic = log->l_freelist; 3297 log->l_freelist = tic->t_next; 3298 if (log->l_freelist == NULL) 3299 log->l_tail = NULL; 3300 log->l_ticket_cnt--; 3301 LOG_UNLOCK(log, s); 3302 3303 /* 3304 * Permanent reservations have up to 'cnt'-1 active log operations 3305 * in the log. A unit in this case is the amount of space for one 3306 * of these log operations. Normal reservations have a cnt of 1 3307 * and their unit amount is the total amount of space required. 3308 * 3309 * The following lines of code account for non-transaction data 3310 * which occupy space in the on-disk log. 3311 * 3312 * Normal form of a transaction is: 3313 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> 3314 * and then there are LR hdrs, split-recs and roundoff at end of syncs. 3315 * 3316 * We need to account for all the leadup data and trailer data 3317 * around the transaction data. 3318 * And then we need to account for the worst case in terms of using 3319 * more space. 3320 * The worst case will happen if: 3321 * - the placement of the transaction happens to be such that the 3322 * roundoff is at its maximum 3323 * - the transaction data is synced before the commit record is synced 3324 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> 3325 * Therefore the commit record is in its own Log Record. 3326 * This can happen as the commit record is called with its 3327 * own region to xlog_write(). 3328 * This then means that in the worst case, roundoff can happen for 3329 * the commit-rec as well. 3330 * The commit-rec is smaller than padding in this scenario and so it is 3331 * not added separately. 3332 */ 3333 3334 /* for trans header */ 3335 unit_bytes += sizeof(xlog_op_header_t); 3336 unit_bytes += sizeof(xfs_trans_header_t); 3337 3338 /* for start-rec */ 3339 unit_bytes += sizeof(xlog_op_header_t); 3340 3341 /* for LR headers */ 3342 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); 3343 unit_bytes += log->l_iclog_hsize * num_headers; 3344 3345 /* for commit-rec LR header - note: padding will subsume the ophdr */ 3346 unit_bytes += log->l_iclog_hsize; 3347 3348 /* for split-recs - ophdrs added when data split over LRs */ 3349 unit_bytes += sizeof(xlog_op_header_t) * num_headers; 3350 3351 /* for roundoff padding for transaction data and one for commit record */ 3352 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 3353 log->l_mp->m_sb.sb_logsunit > 1) { 3354 /* log su roundoff */ 3355 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; 3356 } else { 3357 /* BB roundoff */ 3358 unit_bytes += 2*BBSIZE; 3359 } 3360 3361 tic->t_unit_res = unit_bytes; 3362 tic->t_curr_res = unit_bytes; 3363 tic->t_cnt = cnt; 3364 tic->t_ocnt = cnt; 3365 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); 3366 tic->t_clientid = client; 3367 tic->t_flags = XLOG_TIC_INITED; 3368 tic->t_trans_type = 0; 3369 if (xflags & XFS_LOG_PERM_RESERV) 3370 tic->t_flags |= XLOG_TIC_PERM_RESERV; 3371 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick"); 3372 3373 xlog_tic_reset_res(tic); 3374 3375 return tic; 3376 } /* xlog_ticket_get */ 3377 3378 3379 /****************************************************************************** 3380 * 3381 * Log debug routines 3382 * 3383 ****************************************************************************** 3384 */ 3385 #if defined(DEBUG) 3386 /* 3387 * Make sure that the destination ptr is within the valid data region of 3388 * one of the iclogs. This uses backup pointers stored in a different 3389 * part of the log in case we trash the log structure. 3390 */ 3391 void 3392 xlog_verify_dest_ptr(xlog_t *log, 3393 __psint_t ptr) 3394 { 3395 int i; 3396 int good_ptr = 0; 3397 3398 for (i=0; i < log->l_iclog_bufs; i++) { 3399 if (ptr >= (__psint_t)log->l_iclog_bak[i] && 3400 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) 3401 good_ptr++; 3402 } 3403 if (! good_ptr) 3404 xlog_panic("xlog_verify_dest_ptr: invalid ptr"); 3405 } /* xlog_verify_dest_ptr */ 3406 3407 STATIC void 3408 xlog_verify_grant_head(xlog_t *log, int equals) 3409 { 3410 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { 3411 if (equals) 3412 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); 3413 else 3414 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); 3415 } else { 3416 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); 3417 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); 3418 } 3419 } /* xlog_verify_grant_head */ 3420 3421 /* check if it will fit */ 3422 STATIC void 3423 xlog_verify_tail_lsn(xlog_t *log, 3424 xlog_in_core_t *iclog, 3425 xfs_lsn_t tail_lsn) 3426 { 3427 int blocks; 3428 3429 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { 3430 blocks = 3431 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); 3432 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) 3433 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3434 } else { 3435 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); 3436 3437 if (BLOCK_LSN(tail_lsn) == log->l_prev_block) 3438 xlog_panic("xlog_verify_tail_lsn: tail wrapped"); 3439 3440 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; 3441 if (blocks < BTOBB(iclog->ic_offset) + 1) 3442 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3443 } 3444 } /* xlog_verify_tail_lsn */ 3445 3446 /* 3447 * Perform a number of checks on the iclog before writing to disk. 3448 * 3449 * 1. Make sure the iclogs are still circular 3450 * 2. Make sure we have a good magic number 3451 * 3. Make sure we don't have magic numbers in the data 3452 * 4. Check fields of each log operation header for: 3453 * A. Valid client identifier 3454 * B. tid ptr value falls in valid ptr space (user space code) 3455 * C. Length in log record header is correct according to the 3456 * individual operation headers within record. 3457 * 5. When a bwrite will occur within 5 blocks of the front of the physical 3458 * log, check the preceding blocks of the physical log to make sure all 3459 * the cycle numbers agree with the current cycle number. 3460 */ 3461 STATIC void 3462 xlog_verify_iclog(xlog_t *log, 3463 xlog_in_core_t *iclog, 3464 int count, 3465 boolean_t syncing) 3466 { 3467 xlog_op_header_t *ophead; 3468 xlog_in_core_t *icptr; 3469 xlog_in_core_2_t *xhdr; 3470 xfs_caddr_t ptr; 3471 xfs_caddr_t base_ptr; 3472 __psint_t field_offset; 3473 __uint8_t clientid; 3474 int len, i, j, k, op_len; 3475 int idx; 3476 SPLDECL(s); 3477 3478 /* check validity of iclog pointers */ 3479 s = LOG_LOCK(log); 3480 icptr = log->l_iclog; 3481 for (i=0; i < log->l_iclog_bufs; i++) { 3482 if (icptr == NULL) 3483 xlog_panic("xlog_verify_iclog: invalid ptr"); 3484 icptr = icptr->ic_next; 3485 } 3486 if (icptr != log->l_iclog) 3487 xlog_panic("xlog_verify_iclog: corrupt iclog ring"); 3488 LOG_UNLOCK(log, s); 3489 3490 /* check log magic numbers */ 3491 ptr = (xfs_caddr_t) &(iclog->ic_header); 3492 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM) 3493 xlog_panic("xlog_verify_iclog: invalid magic num"); 3494 3495 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count; 3496 ptr += BBSIZE) { 3497 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 3498 xlog_panic("xlog_verify_iclog: unexpected magic num"); 3499 } 3500 3501 /* check fields */ 3502 len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT); 3503 ptr = iclog->ic_datap; 3504 base_ptr = ptr; 3505 ophead = (xlog_op_header_t *)ptr; 3506 xhdr = (xlog_in_core_2_t *)&iclog->ic_header; 3507 for (i = 0; i < len; i++) { 3508 ophead = (xlog_op_header_t *)ptr; 3509 3510 /* clientid is only 1 byte */ 3511 field_offset = (__psint_t) 3512 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); 3513 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3514 clientid = ophead->oh_clientid; 3515 } else { 3516 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); 3517 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3518 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3519 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3520 clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3521 } else { 3522 clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3523 } 3524 } 3525 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) 3526 cmn_err(CE_WARN, "xlog_verify_iclog: " 3527 "invalid clientid %d op 0x%p offset 0x%lx", 3528 clientid, ophead, (unsigned long)field_offset); 3529 3530 /* check length */ 3531 field_offset = (__psint_t) 3532 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); 3533 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3534 op_len = INT_GET(ophead->oh_len, ARCH_CONVERT); 3535 } else { 3536 idx = BTOBBT((__psint_t)&ophead->oh_len - 3537 (__psint_t)iclog->ic_datap); 3538 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3539 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3540 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3541 op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3542 } else { 3543 op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3544 } 3545 } 3546 ptr += sizeof(xlog_op_header_t) + op_len; 3547 } 3548 } /* xlog_verify_iclog */ 3549 #endif 3550 3551 /* 3552 * Mark all iclogs IOERROR. LOG_LOCK is held by the caller. 3553 */ 3554 STATIC int 3555 xlog_state_ioerror( 3556 xlog_t *log) 3557 { 3558 xlog_in_core_t *iclog, *ic; 3559 3560 iclog = log->l_iclog; 3561 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { 3562 /* 3563 * Mark all the incore logs IOERROR. 3564 * From now on, no log flushes will result. 3565 */ 3566 ic = iclog; 3567 do { 3568 ic->ic_state = XLOG_STATE_IOERROR; 3569 ic = ic->ic_next; 3570 } while (ic != iclog); 3571 return 0; 3572 } 3573 /* 3574 * Return non-zero, if state transition has already happened. 3575 */ 3576 return 1; 3577 } 3578 3579 /* 3580 * This is called from xfs_force_shutdown, when we're forcibly 3581 * shutting down the filesystem, typically because of an IO error. 3582 * Our main objectives here are to make sure that: 3583 * a. the filesystem gets marked 'SHUTDOWN' for all interested 3584 * parties to find out, 'atomically'. 3585 * b. those who're sleeping on log reservations, pinned objects and 3586 * other resources get woken up, and be told the bad news. 3587 * c. nothing new gets queued up after (a) and (b) are done. 3588 * d. if !logerror, flush the iclogs to disk, then seal them off 3589 * for business. 3590 */ 3591 int 3592 xfs_log_force_umount( 3593 struct xfs_mount *mp, 3594 int logerror) 3595 { 3596 xlog_ticket_t *tic; 3597 xlog_t *log; 3598 int retval; 3599 int dummy; 3600 SPLDECL(s); 3601 SPLDECL(s2); 3602 3603 log = mp->m_log; 3604 3605 /* 3606 * If this happens during log recovery, don't worry about 3607 * locking; the log isn't open for business yet. 3608 */ 3609 if (!log || 3610 log->l_flags & XLOG_ACTIVE_RECOVERY) { 3611 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3612 XFS_BUF_DONE(mp->m_sb_bp); 3613 return 0; 3614 } 3615 3616 /* 3617 * Somebody could've already done the hard work for us. 3618 * No need to get locks for this. 3619 */ 3620 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { 3621 ASSERT(XLOG_FORCED_SHUTDOWN(log)); 3622 return 1; 3623 } 3624 retval = 0; 3625 /* 3626 * We must hold both the GRANT lock and the LOG lock, 3627 * before we mark the filesystem SHUTDOWN and wake 3628 * everybody up to tell the bad news. 3629 */ 3630 s = GRANT_LOCK(log); 3631 s2 = LOG_LOCK(log); 3632 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3633 XFS_BUF_DONE(mp->m_sb_bp); 3634 /* 3635 * This flag is sort of redundant because of the mount flag, but 3636 * it's good to maintain the separation between the log and the rest 3637 * of XFS. 3638 */ 3639 log->l_flags |= XLOG_IO_ERROR; 3640 3641 /* 3642 * If we hit a log error, we want to mark all the iclogs IOERROR 3643 * while we're still holding the loglock. 3644 */ 3645 if (logerror) 3646 retval = xlog_state_ioerror(log); 3647 LOG_UNLOCK(log, s2); 3648 3649 /* 3650 * We don't want anybody waiting for log reservations 3651 * after this. That means we have to wake up everybody 3652 * queued up on reserve_headq as well as write_headq. 3653 * In addition, we make sure in xlog_{re}grant_log_space 3654 * that we don't enqueue anything once the SHUTDOWN flag 3655 * is set, and this action is protected by the GRANTLOCK. 3656 */ 3657 if ((tic = log->l_reserve_headq)) { 3658 do { 3659 sv_signal(&tic->t_sema); 3660 tic = tic->t_next; 3661 } while (tic != log->l_reserve_headq); 3662 } 3663 3664 if ((tic = log->l_write_headq)) { 3665 do { 3666 sv_signal(&tic->t_sema); 3667 tic = tic->t_next; 3668 } while (tic != log->l_write_headq); 3669 } 3670 GRANT_UNLOCK(log, s); 3671 3672 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { 3673 ASSERT(!logerror); 3674 /* 3675 * Force the incore logs to disk before shutting the 3676 * log down completely. 3677 */ 3678 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy); 3679 s2 = LOG_LOCK(log); 3680 retval = xlog_state_ioerror(log); 3681 LOG_UNLOCK(log, s2); 3682 } 3683 /* 3684 * Wake up everybody waiting on xfs_log_force. 3685 * Callback all log item committed functions as if the 3686 * log writes were completed. 3687 */ 3688 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); 3689 3690 #ifdef XFSERRORDEBUG 3691 { 3692 xlog_in_core_t *iclog; 3693 3694 s = LOG_LOCK(log); 3695 iclog = log->l_iclog; 3696 do { 3697 ASSERT(iclog->ic_callback == 0); 3698 iclog = iclog->ic_next; 3699 } while (iclog != log->l_iclog); 3700 LOG_UNLOCK(log, s); 3701 } 3702 #endif 3703 /* return non-zero if log IOERROR transition had already happened */ 3704 return retval; 3705 } 3706 3707 STATIC int 3708 xlog_iclogs_empty(xlog_t *log) 3709 { 3710 xlog_in_core_t *iclog; 3711 3712 iclog = log->l_iclog; 3713 do { 3714 /* endianness does not matter here, zero is zero in 3715 * any language. 3716 */ 3717 if (iclog->ic_header.h_num_logops) 3718 return 0; 3719 iclog = iclog->ic_next; 3720 } while (iclog != log->l_iclog); 3721 return 1; 3722 } 3723