1 /* 2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * Further, this software is distributed without any warranty that it is 13 * free of the rightful claim of any third person regarding infringement 14 * or the like. Any license provided herein, whether implied or 15 * otherwise, applies only to this software file. Patent licenses, if 16 * any, provided herein do not apply to combinations of this program with 17 * other software, or any other product whatsoever. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write the Free Software Foundation, Inc., 59 21 * Temple Place - Suite 330, Boston MA 02111-1307, USA. 22 * 23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, 24 * Mountain View, CA 94043, or: 25 * 26 * http://www.sgi.com 27 * 28 * For further information regarding this notice, see: 29 * 30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ 31 */ 32 33 /* 34 * High level interface routines for log manager 35 */ 36 37 #include "xfs.h" 38 #include "xfs_macros.h" 39 #include "xfs_types.h" 40 #include "xfs_inum.h" 41 #include "xfs_ag.h" 42 #include "xfs_sb.h" 43 #include "xfs_log.h" 44 #include "xfs_trans.h" 45 #include "xfs_dir.h" 46 #include "xfs_dmapi.h" 47 #include "xfs_mount.h" 48 #include "xfs_error.h" 49 #include "xfs_log_priv.h" 50 #include "xfs_buf_item.h" 51 #include "xfs_alloc_btree.h" 52 #include "xfs_log_recover.h" 53 #include "xfs_bit.h" 54 #include "xfs_rw.h" 55 #include "xfs_trans_priv.h" 56 57 58 #define xlog_write_adv_cnt(ptr, len, off, bytes) \ 59 { (ptr) += (bytes); \ 60 (len) -= (bytes); \ 61 (off) += (bytes);} 62 63 /* Local miscellaneous function prototypes */ 64 STATIC int xlog_bdstrat_cb(struct xfs_buf *); 65 STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket, 66 xlog_in_core_t **, xfs_lsn_t *); 67 STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, 68 xfs_buftarg_t *log_target, 69 xfs_daddr_t blk_offset, 70 int num_bblks); 71 STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes); 72 STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); 73 STATIC void xlog_unalloc_log(xlog_t *log); 74 STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[], 75 int nentries, xfs_log_ticket_t tic, 76 xfs_lsn_t *start_lsn, 77 xlog_in_core_t **commit_iclog, 78 uint flags); 79 80 /* local state machine functions */ 81 STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); 82 STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); 83 STATIC int xlog_state_get_iclog_space(xlog_t *log, 84 int len, 85 xlog_in_core_t **iclog, 86 xlog_ticket_t *ticket, 87 int *continued_write, 88 int *logoffsetp); 89 STATIC void xlog_state_put_ticket(xlog_t *log, 90 xlog_ticket_t *tic); 91 STATIC int xlog_state_release_iclog(xlog_t *log, 92 xlog_in_core_t *iclog); 93 STATIC void xlog_state_switch_iclogs(xlog_t *log, 94 xlog_in_core_t *iclog, 95 int eventual_size); 96 STATIC int xlog_state_sync(xlog_t *log, xfs_lsn_t lsn, uint flags); 97 STATIC int xlog_state_sync_all(xlog_t *log, uint flags); 98 STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); 99 100 /* local functions to manipulate grant head */ 101 STATIC int xlog_grant_log_space(xlog_t *log, 102 xlog_ticket_t *xtic); 103 STATIC void xlog_grant_push_ail(xfs_mount_t *mp, 104 int need_bytes); 105 STATIC void xlog_regrant_reserve_log_space(xlog_t *log, 106 xlog_ticket_t *ticket); 107 STATIC int xlog_regrant_write_log_space(xlog_t *log, 108 xlog_ticket_t *ticket); 109 STATIC void xlog_ungrant_log_space(xlog_t *log, 110 xlog_ticket_t *ticket); 111 112 113 /* local ticket functions */ 114 STATIC void xlog_state_ticket_alloc(xlog_t *log); 115 STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log, 116 int unit_bytes, 117 int count, 118 char clientid, 119 uint flags); 120 STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket); 121 122 /* local debug functions */ 123 #if defined(DEBUG) && !defined(XLOG_NOLOG) 124 STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); 125 STATIC void xlog_verify_grant_head(xlog_t *log, int equals); 126 STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, 127 int count, boolean_t syncing); 128 STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, 129 xfs_lsn_t tail_lsn); 130 #else 131 #define xlog_verify_dest_ptr(a,b) 132 #define xlog_verify_grant_head(a,b) 133 #define xlog_verify_iclog(a,b,c,d) 134 #define xlog_verify_tail_lsn(a,b,c) 135 #endif 136 137 STATIC int xlog_iclogs_empty(xlog_t *log); 138 139 #ifdef DEBUG 140 int xlog_do_error = 0; 141 int xlog_req_num = 0; 142 int xlog_error_mod = 33; 143 #endif 144 145 #define XLOG_FORCED_SHUTDOWN(log) (log->l_flags & XLOG_IO_ERROR) 146 147 /* 148 * 0 => disable log manager 149 * 1 => enable log manager 150 * 2 => enable log manager and log debugging 151 */ 152 #if defined(XLOG_NOLOG) || defined(DEBUG) 153 int xlog_debug = 1; 154 xfs_buftarg_t *xlog_target; 155 #endif 156 157 #if defined(XFS_LOG_TRACE) 158 159 void 160 xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string) 161 { 162 unsigned long cnts; 163 164 if (!log->l_grant_trace) { 165 log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP); 166 if (!log->l_grant_trace) 167 return; 168 } 169 /* ticket counts are 1 byte each */ 170 cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8; 171 172 ktrace_enter(log->l_grant_trace, 173 (void *)tic, 174 (void *)log->l_reserve_headq, 175 (void *)log->l_write_headq, 176 (void *)((unsigned long)log->l_grant_reserve_cycle), 177 (void *)((unsigned long)log->l_grant_reserve_bytes), 178 (void *)((unsigned long)log->l_grant_write_cycle), 179 (void *)((unsigned long)log->l_grant_write_bytes), 180 (void *)((unsigned long)log->l_curr_cycle), 181 (void *)((unsigned long)log->l_curr_block), 182 (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)), 183 (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)), 184 (void *)string, 185 (void *)((unsigned long)tic->t_trans_type), 186 (void *)cnts, 187 (void *)((unsigned long)tic->t_curr_res), 188 (void *)((unsigned long)tic->t_unit_res)); 189 } 190 191 void 192 xlog_trace_iclog(xlog_in_core_t *iclog, uint state) 193 { 194 pid_t pid; 195 196 pid = current_pid(); 197 198 if (!iclog->ic_trace) 199 iclog->ic_trace = ktrace_alloc(256, KM_SLEEP); 200 ktrace_enter(iclog->ic_trace, 201 (void *)((unsigned long)state), 202 (void *)((unsigned long)pid), 203 (void *)0, 204 (void *)0, 205 (void *)0, 206 (void *)0, 207 (void *)0, 208 (void *)0, 209 (void *)0, 210 (void *)0, 211 (void *)0, 212 (void *)0, 213 (void *)0, 214 (void *)0, 215 (void *)0, 216 (void *)0); 217 } 218 219 #else 220 #define xlog_trace_loggrant(log,tic,string) 221 #define xlog_trace_iclog(iclog,state) 222 #endif /* XFS_LOG_TRACE */ 223 224 /* 225 * NOTES: 226 * 227 * 1. currblock field gets updated at startup and after in-core logs 228 * marked as with WANT_SYNC. 229 */ 230 231 /* 232 * This routine is called when a user of a log manager ticket is done with 233 * the reservation. If the ticket was ever used, then a commit record for 234 * the associated transaction is written out as a log operation header with 235 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with 236 * a given ticket. If the ticket was one with a permanent reservation, then 237 * a few operations are done differently. Permanent reservation tickets by 238 * default don't release the reservation. They just commit the current 239 * transaction with the belief that the reservation is still needed. A flag 240 * must be passed in before permanent reservations are actually released. 241 * When these type of tickets are not released, they need to be set into 242 * the inited state again. By doing this, a start record will be written 243 * out when the next write occurs. 244 */ 245 xfs_lsn_t 246 xfs_log_done(xfs_mount_t *mp, 247 xfs_log_ticket_t xtic, 248 void **iclog, 249 uint flags) 250 { 251 xlog_t *log = mp->m_log; 252 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; 253 xfs_lsn_t lsn = 0; 254 255 #if defined(DEBUG) || defined(XLOG_NOLOG) 256 if (!xlog_debug && xlog_target == log->l_targ) 257 return 0; 258 #endif 259 260 if (XLOG_FORCED_SHUTDOWN(log) || 261 /* 262 * If nothing was ever written, don't write out commit record. 263 * If we get an error, just continue and give back the log ticket. 264 */ 265 (((ticket->t_flags & XLOG_TIC_INITED) == 0) && 266 (xlog_commit_record(mp, ticket, 267 (xlog_in_core_t **)iclog, &lsn)))) { 268 lsn = (xfs_lsn_t) -1; 269 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { 270 flags |= XFS_LOG_REL_PERM_RESERV; 271 } 272 } 273 274 275 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || 276 (flags & XFS_LOG_REL_PERM_RESERV)) { 277 /* 278 * Release ticket if not permanent reservation or a specifc 279 * request has been made to release a permanent reservation. 280 */ 281 xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)"); 282 xlog_ungrant_log_space(log, ticket); 283 xlog_state_put_ticket(log, ticket); 284 } else { 285 xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)"); 286 xlog_regrant_reserve_log_space(log, ticket); 287 } 288 289 /* If this ticket was a permanent reservation and we aren't 290 * trying to release it, reset the inited flags; so next time 291 * we write, a start record will be written out. 292 */ 293 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) && 294 (flags & XFS_LOG_REL_PERM_RESERV) == 0) 295 ticket->t_flags |= XLOG_TIC_INITED; 296 297 return lsn; 298 } /* xfs_log_done */ 299 300 301 /* 302 * Force the in-core log to disk. If flags == XFS_LOG_SYNC, 303 * the force is done synchronously. 304 * 305 * Asynchronous forces are implemented by setting the WANT_SYNC 306 * bit in the appropriate in-core log and then returning. 307 * 308 * Synchronous forces are implemented with a semaphore. All callers 309 * to force a given lsn to disk will wait on a semaphore attached to the 310 * specific in-core log. When given in-core log finally completes its 311 * write to disk, that thread will wake up all threads waiting on the 312 * semaphore. 313 */ 314 int 315 xfs_log_force(xfs_mount_t *mp, 316 xfs_lsn_t lsn, 317 uint flags) 318 { 319 int rval; 320 xlog_t *log = mp->m_log; 321 322 #if defined(DEBUG) || defined(XLOG_NOLOG) 323 if (!xlog_debug && xlog_target == log->l_targ) 324 return 0; 325 #endif 326 327 ASSERT(flags & XFS_LOG_FORCE); 328 329 XFS_STATS_INC(xs_log_force); 330 331 if ((log->l_flags & XLOG_IO_ERROR) == 0) { 332 if (lsn == 0) 333 rval = xlog_state_sync_all(log, flags); 334 else 335 rval = xlog_state_sync(log, lsn, flags); 336 } else { 337 rval = XFS_ERROR(EIO); 338 } 339 340 return rval; 341 342 } /* xfs_log_force */ 343 344 /* 345 * Attaches a new iclog I/O completion callback routine during 346 * transaction commit. If the log is in error state, a non-zero 347 * return code is handed back and the caller is responsible for 348 * executing the callback at an appropriate time. 349 */ 350 int 351 xfs_log_notify(xfs_mount_t *mp, /* mount of partition */ 352 void *iclog_hndl, /* iclog to hang callback off */ 353 xfs_log_callback_t *cb) 354 { 355 xlog_t *log = mp->m_log; 356 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 357 int abortflg, spl; 358 359 #if defined(DEBUG) || defined(XLOG_NOLOG) 360 if (!xlog_debug && xlog_target == log->l_targ) 361 return 0; 362 #endif 363 cb->cb_next = NULL; 364 spl = LOG_LOCK(log); 365 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); 366 if (!abortflg) { 367 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || 368 (iclog->ic_state == XLOG_STATE_WANT_SYNC)); 369 cb->cb_next = NULL; 370 *(iclog->ic_callback_tail) = cb; 371 iclog->ic_callback_tail = &(cb->cb_next); 372 } 373 LOG_UNLOCK(log, spl); 374 return abortflg; 375 } /* xfs_log_notify */ 376 377 int 378 xfs_log_release_iclog(xfs_mount_t *mp, 379 void *iclog_hndl) 380 { 381 xlog_t *log = mp->m_log; 382 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; 383 384 if (xlog_state_release_iclog(log, iclog)) { 385 xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); 386 return(EIO); 387 } 388 389 return 0; 390 } 391 392 /* 393 * 1. Reserve an amount of on-disk log space and return a ticket corresponding 394 * to the reservation. 395 * 2. Potentially, push buffers at tail of log to disk. 396 * 397 * Each reservation is going to reserve extra space for a log record header. 398 * When writes happen to the on-disk log, we don't subtract the length of the 399 * log record header from any reservation. By wasting space in each 400 * reservation, we prevent over allocation problems. 401 */ 402 int 403 xfs_log_reserve(xfs_mount_t *mp, 404 int unit_bytes, 405 int cnt, 406 xfs_log_ticket_t *ticket, 407 __uint8_t client, 408 uint flags, 409 uint t_type) 410 { 411 xlog_t *log = mp->m_log; 412 xlog_ticket_t *internal_ticket; 413 int retval; 414 415 #if defined(DEBUG) || defined(XLOG_NOLOG) 416 if (!xlog_debug && xlog_target == log->l_targ) 417 return 0; 418 #endif 419 retval = 0; 420 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); 421 ASSERT((flags & XFS_LOG_NOSLEEP) == 0); 422 423 if (XLOG_FORCED_SHUTDOWN(log)) 424 return XFS_ERROR(EIO); 425 426 XFS_STATS_INC(xs_try_logspace); 427 428 if (*ticket != NULL) { 429 ASSERT(flags & XFS_LOG_PERM_RESERV); 430 internal_ticket = (xlog_ticket_t *)*ticket; 431 xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)"); 432 xlog_grant_push_ail(mp, internal_ticket->t_unit_res); 433 retval = xlog_regrant_write_log_space(log, internal_ticket); 434 } else { 435 /* may sleep if need to allocate more tickets */ 436 internal_ticket = xlog_ticket_get(log, unit_bytes, cnt, 437 client, flags); 438 internal_ticket->t_trans_type = t_type; 439 *ticket = internal_ticket; 440 xlog_trace_loggrant(log, internal_ticket, 441 (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ? 442 "xfs_log_reserve: create new ticket (permanent trans)" : 443 "xfs_log_reserve: create new ticket"); 444 xlog_grant_push_ail(mp, 445 (internal_ticket->t_unit_res * 446 internal_ticket->t_cnt)); 447 retval = xlog_grant_log_space(log, internal_ticket); 448 } 449 450 return retval; 451 } /* xfs_log_reserve */ 452 453 454 /* 455 * Mount a log filesystem 456 * 457 * mp - ubiquitous xfs mount point structure 458 * log_target - buftarg of on-disk log device 459 * blk_offset - Start block # where block size is 512 bytes (BBSIZE) 460 * num_bblocks - Number of BBSIZE blocks in on-disk log 461 * 462 * Return error or zero. 463 */ 464 int 465 xfs_log_mount(xfs_mount_t *mp, 466 xfs_buftarg_t *log_target, 467 xfs_daddr_t blk_offset, 468 int num_bblks) 469 { 470 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 471 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); 472 else { 473 cmn_err(CE_NOTE, 474 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", 475 mp->m_fsname); 476 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); 477 } 478 479 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); 480 481 #if defined(DEBUG) || defined(XLOG_NOLOG) 482 if (!xlog_debug) { 483 cmn_err(CE_NOTE, "log dev: %s", XFS_BUFTARG_NAME(log_target)); 484 return 0; 485 } 486 #endif 487 /* 488 * skip log recovery on a norecovery mount. pretend it all 489 * just worked. 490 */ 491 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { 492 int error; 493 vfs_t *vfsp = XFS_MTOVFS(mp); 494 int readonly = (vfsp->vfs_flag & VFS_RDONLY); 495 496 if (readonly) 497 vfsp->vfs_flag &= ~VFS_RDONLY; 498 499 error = xlog_recover(mp->m_log, readonly); 500 501 if (readonly) 502 vfsp->vfs_flag |= VFS_RDONLY; 503 if (error) { 504 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); 505 xlog_unalloc_log(mp->m_log); 506 return error; 507 } 508 } 509 510 /* Normal transactions can now occur */ 511 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; 512 513 /* End mounting message in xfs_log_mount_finish */ 514 return 0; 515 } /* xfs_log_mount */ 516 517 /* 518 * Finish the recovery of the file system. This is separate from 519 * the xfs_log_mount() call, because it depends on the code in 520 * xfs_mountfs() to read in the root and real-time bitmap inodes 521 * between calling xfs_log_mount() and here. 522 * 523 * mp - ubiquitous xfs mount point structure 524 */ 525 int 526 xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags) 527 { 528 int error; 529 530 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) 531 error = xlog_recover_finish(mp->m_log, mfsi_flags); 532 else { 533 error = 0; 534 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); 535 } 536 537 return error; 538 } 539 540 /* 541 * Unmount processing for the log. 542 */ 543 int 544 xfs_log_unmount(xfs_mount_t *mp) 545 { 546 int error; 547 548 error = xfs_log_unmount_write(mp); 549 xfs_log_unmount_dealloc(mp); 550 return (error); 551 } 552 553 /* 554 * Final log writes as part of unmount. 555 * 556 * Mark the filesystem clean as unmount happens. Note that during relocation 557 * this routine needs to be executed as part of source-bag while the 558 * deallocation must not be done until source-end. 559 */ 560 561 /* 562 * Unmount record used to have a string "Unmount filesystem--" in the 563 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). 564 * We just write the magic number now since that particular field isn't 565 * currently architecture converted and "nUmount" is a bit foo. 566 * As far as I know, there weren't any dependencies on the old behaviour. 567 */ 568 569 int 570 xfs_log_unmount_write(xfs_mount_t *mp) 571 { 572 xlog_t *log = mp->m_log; 573 xlog_in_core_t *iclog; 574 #ifdef DEBUG 575 xlog_in_core_t *first_iclog; 576 #endif 577 xfs_log_iovec_t reg[1]; 578 xfs_log_ticket_t tic = NULL; 579 xfs_lsn_t lsn; 580 int error; 581 SPLDECL(s); 582 583 /* the data section must be 32 bit size aligned */ 584 struct { 585 __uint16_t magic; 586 __uint16_t pad1; 587 __uint32_t pad2; /* may as well make it 64 bits */ 588 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; 589 590 #if defined(DEBUG) || defined(XLOG_NOLOG) 591 if (!xlog_debug && xlog_target == log->l_targ) 592 return 0; 593 #endif 594 595 /* 596 * Don't write out unmount record on read-only mounts. 597 * Or, if we are doing a forced umount (typically because of IO errors). 598 */ 599 if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY) 600 return 0; 601 602 xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC); 603 604 #ifdef DEBUG 605 first_iclog = iclog = log->l_iclog; 606 do { 607 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 608 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); 609 ASSERT(iclog->ic_offset == 0); 610 } 611 iclog = iclog->ic_next; 612 } while (iclog != first_iclog); 613 #endif 614 if (! (XLOG_FORCED_SHUTDOWN(log))) { 615 reg[0].i_addr = (void*)&magic; 616 reg[0].i_len = sizeof(magic); 617 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT); 618 619 error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0, 0); 620 if (!error) { 621 /* remove inited flag */ 622 ((xlog_ticket_t *)tic)->t_flags = 0; 623 error = xlog_write(mp, reg, 1, tic, &lsn, 624 NULL, XLOG_UNMOUNT_TRANS); 625 /* 626 * At this point, we're umounting anyway, 627 * so there's no point in transitioning log state 628 * to IOERROR. Just continue... 629 */ 630 } 631 632 if (error) { 633 xfs_fs_cmn_err(CE_ALERT, mp, 634 "xfs_log_unmount: unmount record failed"); 635 } 636 637 638 s = LOG_LOCK(log); 639 iclog = log->l_iclog; 640 iclog->ic_refcnt++; 641 LOG_UNLOCK(log, s); 642 xlog_state_want_sync(log, iclog); 643 (void) xlog_state_release_iclog(log, iclog); 644 645 s = LOG_LOCK(log); 646 if (!(iclog->ic_state == XLOG_STATE_ACTIVE || 647 iclog->ic_state == XLOG_STATE_DIRTY)) { 648 if (!XLOG_FORCED_SHUTDOWN(log)) { 649 sv_wait(&iclog->ic_forcesema, PMEM, 650 &log->l_icloglock, s); 651 } else { 652 LOG_UNLOCK(log, s); 653 } 654 } else { 655 LOG_UNLOCK(log, s); 656 } 657 if (tic) 658 xlog_state_put_ticket(log, tic); 659 } else { 660 /* 661 * We're already in forced_shutdown mode, couldn't 662 * even attempt to write out the unmount transaction. 663 * 664 * Go through the motions of sync'ing and releasing 665 * the iclog, even though no I/O will actually happen, 666 * we need to wait for other log I/O's that may already 667 * be in progress. Do this as a separate section of 668 * code so we'll know if we ever get stuck here that 669 * we're in this odd situation of trying to unmount 670 * a file system that went into forced_shutdown as 671 * the result of an unmount.. 672 */ 673 s = LOG_LOCK(log); 674 iclog = log->l_iclog; 675 iclog->ic_refcnt++; 676 LOG_UNLOCK(log, s); 677 678 xlog_state_want_sync(log, iclog); 679 (void) xlog_state_release_iclog(log, iclog); 680 681 s = LOG_LOCK(log); 682 683 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE 684 || iclog->ic_state == XLOG_STATE_DIRTY 685 || iclog->ic_state == XLOG_STATE_IOERROR) ) { 686 687 sv_wait(&iclog->ic_forcesema, PMEM, 688 &log->l_icloglock, s); 689 } else { 690 LOG_UNLOCK(log, s); 691 } 692 } 693 694 return 0; 695 } /* xfs_log_unmount_write */ 696 697 /* 698 * Deallocate log structures for unmount/relocation. 699 */ 700 void 701 xfs_log_unmount_dealloc(xfs_mount_t *mp) 702 { 703 xlog_unalloc_log(mp->m_log); 704 } 705 706 /* 707 * Write region vectors to log. The write happens using the space reservation 708 * of the ticket (tic). It is not a requirement that all writes for a given 709 * transaction occur with one call to xfs_log_write(). 710 */ 711 int 712 xfs_log_write(xfs_mount_t * mp, 713 xfs_log_iovec_t reg[], 714 int nentries, 715 xfs_log_ticket_t tic, 716 xfs_lsn_t *start_lsn) 717 { 718 int error; 719 xlog_t *log = mp->m_log; 720 721 #if defined(DEBUG) || defined(XLOG_NOLOG) 722 if (!xlog_debug && xlog_target == log->l_targ) { 723 *start_lsn = 0; 724 return 0; 725 } 726 #endif 727 if (XLOG_FORCED_SHUTDOWN(log)) 728 return XFS_ERROR(EIO); 729 730 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { 731 xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); 732 } 733 return (error); 734 } /* xfs_log_write */ 735 736 737 void 738 xfs_log_move_tail(xfs_mount_t *mp, 739 xfs_lsn_t tail_lsn) 740 { 741 xlog_ticket_t *tic; 742 xlog_t *log = mp->m_log; 743 int need_bytes, free_bytes, cycle, bytes; 744 SPLDECL(s); 745 746 #if defined(DEBUG) || defined(XLOG_NOLOG) 747 if (!xlog_debug && xlog_target == log->l_targ) 748 return; 749 #endif 750 /* XXXsup tmp */ 751 if (XLOG_FORCED_SHUTDOWN(log)) 752 return; 753 ASSERT(!XFS_FORCED_SHUTDOWN(mp)); 754 755 if (tail_lsn == 0) { 756 /* needed since sync_lsn is 64 bits */ 757 s = LOG_LOCK(log); 758 tail_lsn = log->l_last_sync_lsn; 759 LOG_UNLOCK(log, s); 760 } 761 762 s = GRANT_LOCK(log); 763 764 /* Also an invalid lsn. 1 implies that we aren't passing in a valid 765 * tail_lsn. 766 */ 767 if (tail_lsn != 1) { 768 log->l_tail_lsn = tail_lsn; 769 } 770 771 if ((tic = log->l_write_headq)) { 772 #ifdef DEBUG 773 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 774 panic("Recovery problem"); 775 #endif 776 cycle = log->l_grant_write_cycle; 777 bytes = log->l_grant_write_bytes; 778 free_bytes = xlog_space_left(log, cycle, bytes); 779 do { 780 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); 781 782 if (free_bytes < tic->t_unit_res && tail_lsn != 1) 783 break; 784 tail_lsn = 0; 785 free_bytes -= tic->t_unit_res; 786 sv_signal(&tic->t_sema); 787 tic = tic->t_next; 788 } while (tic != log->l_write_headq); 789 } 790 if ((tic = log->l_reserve_headq)) { 791 #ifdef DEBUG 792 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 793 panic("Recovery problem"); 794 #endif 795 cycle = log->l_grant_reserve_cycle; 796 bytes = log->l_grant_reserve_bytes; 797 free_bytes = xlog_space_left(log, cycle, bytes); 798 do { 799 if (tic->t_flags & XLOG_TIC_PERM_RESERV) 800 need_bytes = tic->t_unit_res*tic->t_cnt; 801 else 802 need_bytes = tic->t_unit_res; 803 if (free_bytes < need_bytes && tail_lsn != 1) 804 break; 805 tail_lsn = 0; 806 free_bytes -= need_bytes; 807 sv_signal(&tic->t_sema); 808 tic = tic->t_next; 809 } while (tic != log->l_reserve_headq); 810 } 811 GRANT_UNLOCK(log, s); 812 } /* xfs_log_move_tail */ 813 814 /* 815 * Determine if we have a transaction that has gone to disk 816 * that needs to be covered. Log activity needs to be idle (no AIL and 817 * nothing in the iclogs). And, we need to be in the right state indicating 818 * something has gone out. 819 */ 820 int 821 xfs_log_need_covered(xfs_mount_t *mp) 822 { 823 SPLDECL(s); 824 int needed = 0, gen; 825 xlog_t *log = mp->m_log; 826 vfs_t *vfsp = XFS_MTOVFS(mp); 827 828 if (fs_frozen(vfsp) || XFS_FORCED_SHUTDOWN(mp) || 829 (vfsp->vfs_flag & VFS_RDONLY)) 830 return 0; 831 832 s = LOG_LOCK(log); 833 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || 834 (log->l_covered_state == XLOG_STATE_COVER_NEED2)) 835 && !xfs_trans_first_ail(mp, &gen) 836 && xlog_iclogs_empty(log)) { 837 if (log->l_covered_state == XLOG_STATE_COVER_NEED) 838 log->l_covered_state = XLOG_STATE_COVER_DONE; 839 else { 840 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); 841 log->l_covered_state = XLOG_STATE_COVER_DONE2; 842 } 843 needed = 1; 844 } 845 LOG_UNLOCK(log, s); 846 return(needed); 847 } 848 849 /****************************************************************************** 850 * 851 * local routines 852 * 853 ****************************************************************************** 854 */ 855 856 /* xfs_trans_tail_ail returns 0 when there is nothing in the list. 857 * The log manager must keep track of the last LR which was committed 858 * to disk. The lsn of this LR will become the new tail_lsn whenever 859 * xfs_trans_tail_ail returns 0. If we don't do this, we run into 860 * the situation where stuff could be written into the log but nothing 861 * was ever in the AIL when asked. Eventually, we panic since the 862 * tail hits the head. 863 * 864 * We may be holding the log iclog lock upon entering this routine. 865 */ 866 xfs_lsn_t 867 xlog_assign_tail_lsn(xfs_mount_t *mp) 868 { 869 xfs_lsn_t tail_lsn; 870 SPLDECL(s); 871 xlog_t *log = mp->m_log; 872 873 tail_lsn = xfs_trans_tail_ail(mp); 874 s = GRANT_LOCK(log); 875 if (tail_lsn != 0) { 876 log->l_tail_lsn = tail_lsn; 877 } else { 878 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; 879 } 880 GRANT_UNLOCK(log, s); 881 882 return tail_lsn; 883 } /* xlog_assign_tail_lsn */ 884 885 886 /* 887 * Return the space in the log between the tail and the head. The head 888 * is passed in the cycle/bytes formal parms. In the special case where 889 * the reserve head has wrapped passed the tail, this calculation is no 890 * longer valid. In this case, just return 0 which means there is no space 891 * in the log. This works for all places where this function is called 892 * with the reserve head. Of course, if the write head were to ever 893 * wrap the tail, we should blow up. Rather than catch this case here, 894 * we depend on other ASSERTions in other parts of the code. XXXmiken 895 * 896 * This code also handles the case where the reservation head is behind 897 * the tail. The details of this case are described below, but the end 898 * result is that we return the size of the log as the amount of space left. 899 */ 900 int 901 xlog_space_left(xlog_t *log, int cycle, int bytes) 902 { 903 int free_bytes; 904 int tail_bytes; 905 int tail_cycle; 906 907 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); 908 tail_cycle = CYCLE_LSN(log->l_tail_lsn); 909 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { 910 free_bytes = log->l_logsize - (bytes - tail_bytes); 911 } else if ((tail_cycle + 1) < cycle) { 912 return 0; 913 } else if (tail_cycle < cycle) { 914 ASSERT(tail_cycle == (cycle - 1)); 915 free_bytes = tail_bytes - bytes; 916 } else { 917 /* 918 * The reservation head is behind the tail. 919 * In this case we just want to return the size of the 920 * log as the amount of space left. 921 */ 922 xfs_fs_cmn_err(CE_ALERT, log->l_mp, 923 "xlog_space_left: head behind tail\n" 924 " tail_cycle = %d, tail_bytes = %d\n" 925 " GH cycle = %d, GH bytes = %d", 926 tail_cycle, tail_bytes, cycle, bytes); 927 ASSERT(0); 928 free_bytes = log->l_logsize; 929 } 930 return free_bytes; 931 } /* xlog_space_left */ 932 933 934 /* 935 * Log function which is called when an io completes. 936 * 937 * The log manager needs its own routine, in order to control what 938 * happens with the buffer after the write completes. 939 */ 940 void 941 xlog_iodone(xfs_buf_t *bp) 942 { 943 xlog_in_core_t *iclog; 944 xlog_t *l; 945 int aborted; 946 947 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 948 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); 949 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 950 aborted = 0; 951 952 /* 953 * Some versions of cpp barf on the recursive definition of 954 * ic_log -> hic_fields.ic_log and expand ic_log twice when 955 * it is passed through two macros. Workaround broken cpp. 956 */ 957 l = iclog->ic_log; 958 959 /* 960 * Race to shutdown the filesystem if we see an error. 961 */ 962 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, 963 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { 964 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); 965 XFS_BUF_STALE(bp); 966 xfs_force_shutdown(l->l_mp, XFS_LOG_IO_ERROR); 967 /* 968 * This flag will be propagated to the trans-committed 969 * callback routines to let them know that the log-commit 970 * didn't succeed. 971 */ 972 aborted = XFS_LI_ABORTED; 973 } else if (iclog->ic_state & XLOG_STATE_IOERROR) { 974 aborted = XFS_LI_ABORTED; 975 } 976 xlog_state_done_syncing(iclog, aborted); 977 if (!(XFS_BUF_ISASYNC(bp))) { 978 /* 979 * Corresponding psema() will be done in bwrite(). If we don't 980 * vsema() here, panic. 981 */ 982 XFS_BUF_V_IODONESEMA(bp); 983 } 984 } /* xlog_iodone */ 985 986 /* 987 * The bdstrat callback function for log bufs. This gives us a central 988 * place to trap bufs in case we get hit by a log I/O error and need to 989 * shutdown. Actually, in practice, even when we didn't get a log error, 990 * we transition the iclogs to IOERROR state *after* flushing all existing 991 * iclogs to disk. This is because we don't want anymore new transactions to be 992 * started or completed afterwards. 993 */ 994 STATIC int 995 xlog_bdstrat_cb(struct xfs_buf *bp) 996 { 997 xlog_in_core_t *iclog; 998 999 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); 1000 1001 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { 1002 /* note for irix bstrat will need struct bdevsw passed 1003 * Fix the following macro if the code ever is merged 1004 */ 1005 XFS_bdstrat(bp); 1006 return 0; 1007 } 1008 1009 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); 1010 XFS_BUF_ERROR(bp, EIO); 1011 XFS_BUF_STALE(bp); 1012 xfs_biodone(bp); 1013 return (XFS_ERROR(EIO)); 1014 1015 1016 } 1017 1018 /* 1019 * Return size of each in-core log record buffer. 1020 * 1021 * Low memory machines only get 2 16KB buffers. We don't want to waste 1022 * memory here. However, all other machines get at least 2 32KB buffers. 1023 * The number is hard coded because we don't care about the minimum 1024 * memory size, just 32MB systems. 1025 * 1026 * If the filesystem blocksize is too large, we may need to choose a 1027 * larger size since the directory code currently logs entire blocks. 1028 */ 1029 1030 STATIC void 1031 xlog_get_iclog_buffer_size(xfs_mount_t *mp, 1032 xlog_t *log) 1033 { 1034 int size; 1035 int xhdrs; 1036 1037 #if defined(DEBUG) || defined(XLOG_NOLOG) 1038 /* 1039 * When logbufs == 0, someone has disabled the log from the FSTAB 1040 * file. This is not a documented feature. We need to set xlog_debug 1041 * to zero (this deactivates the log) and set xlog_target to the 1042 * appropriate device. Only one filesystem may be affected as such 1043 * since this is just a performance hack to test what we might be able 1044 * to get if the log were not present. 1045 */ 1046 if (mp->m_logbufs == 0) { 1047 xlog_debug = 0; 1048 xlog_target = log->l_targ; 1049 log->l_iclog_bufs = XLOG_MIN_ICLOGS; 1050 } else 1051 #endif 1052 { 1053 /* 1054 * This is the normal path. If m_logbufs == -1, then the 1055 * admin has chosen to use the system defaults for logbuffers. 1056 */ 1057 if (mp->m_logbufs == -1) { 1058 if (xfs_physmem <= btoc(128*1024*1024)) { 1059 log->l_iclog_bufs = XLOG_MIN_ICLOGS; 1060 } else if (xfs_physmem <= btoc(400*1024*1024)) { 1061 log->l_iclog_bufs = XLOG_MED_ICLOGS; 1062 } else { 1063 /* 256K with 32K bufs */ 1064 log->l_iclog_bufs = XLOG_MAX_ICLOGS; 1065 } 1066 } else 1067 log->l_iclog_bufs = mp->m_logbufs; 1068 1069 #if defined(DEBUG) || defined(XLOG_NOLOG) 1070 /* We are reactivating a filesystem after it was inactive */ 1071 if (log->l_targ == xlog_target) { 1072 xlog_target = NULL; 1073 xlog_debug = 1; 1074 } 1075 #endif 1076 } 1077 1078 /* 1079 * Buffer size passed in from mount system call. 1080 */ 1081 if (mp->m_logbsize != -1) { 1082 size = log->l_iclog_size = mp->m_logbsize; 1083 log->l_iclog_size_log = 0; 1084 while (size != 1) { 1085 log->l_iclog_size_log++; 1086 size >>= 1; 1087 } 1088 1089 if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) { 1090 /* # headers = size / 32K 1091 * one header holds cycles from 32K of data 1092 */ 1093 1094 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; 1095 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) 1096 xhdrs++; 1097 log->l_iclog_hsize = xhdrs << BBSHIFT; 1098 log->l_iclog_heads = xhdrs; 1099 } else { 1100 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); 1101 log->l_iclog_hsize = BBSIZE; 1102 log->l_iclog_heads = 1; 1103 } 1104 return; 1105 } 1106 1107 /* 1108 * Special case machines that have less than 32MB of memory. 1109 * All machines with more memory use 32KB buffers. 1110 */ 1111 if (xfs_physmem <= btoc(32*1024*1024)) { 1112 /* Don't change; min configuration */ 1113 log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */ 1114 log->l_iclog_size_log = XLOG_RECORD_BSHIFT; 1115 } else { 1116 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */ 1117 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1118 } 1119 1120 /* the default log size is 16k or 32k which is one header sector */ 1121 log->l_iclog_hsize = BBSIZE; 1122 log->l_iclog_heads = 1; 1123 1124 /* 1125 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use 1126 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers. 1127 */ 1128 if (mp->m_sb.sb_blocksize >= 16*1024) { 1129 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; 1130 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; 1131 if (mp->m_logbufs == -1) { 1132 switch (mp->m_sb.sb_blocksize) { 1133 case 16*1024: /* 16 KB */ 1134 log->l_iclog_bufs = 3; 1135 break; 1136 case 32*1024: /* 32 KB */ 1137 log->l_iclog_bufs = 4; 1138 break; 1139 case 64*1024: /* 64 KB */ 1140 log->l_iclog_bufs = 8; 1141 break; 1142 default: 1143 xlog_panic("XFS: Invalid blocksize"); 1144 break; 1145 } 1146 } 1147 } 1148 } /* xlog_get_iclog_buffer_size */ 1149 1150 1151 /* 1152 * This routine initializes some of the log structure for a given mount point. 1153 * Its primary purpose is to fill in enough, so recovery can occur. However, 1154 * some other stuff may be filled in too. 1155 */ 1156 STATIC xlog_t * 1157 xlog_alloc_log(xfs_mount_t *mp, 1158 xfs_buftarg_t *log_target, 1159 xfs_daddr_t blk_offset, 1160 int num_bblks) 1161 { 1162 xlog_t *log; 1163 xlog_rec_header_t *head; 1164 xlog_in_core_t **iclogp; 1165 xlog_in_core_t *iclog, *prev_iclog=NULL; 1166 xfs_buf_t *bp; 1167 int i; 1168 int iclogsize; 1169 1170 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP); 1171 1172 log->l_mp = mp; 1173 log->l_targ = log_target; 1174 log->l_logsize = BBTOB(num_bblks); 1175 log->l_logBBstart = blk_offset; 1176 log->l_logBBsize = num_bblks; 1177 log->l_covered_state = XLOG_STATE_COVER_IDLE; 1178 log->l_flags |= XLOG_ACTIVE_RECOVERY; 1179 1180 log->l_prev_block = -1; 1181 ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0); 1182 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ 1183 log->l_last_sync_lsn = log->l_tail_lsn; 1184 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ 1185 log->l_grant_reserve_cycle = 1; 1186 log->l_grant_write_cycle = 1; 1187 1188 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) { 1189 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; 1190 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); 1191 /* for larger sector sizes, must have v2 or external log */ 1192 ASSERT(log->l_sectbb_log == 0 || 1193 log->l_logBBstart == 0 || 1194 XFS_SB_VERSION_HASLOGV2(&mp->m_sb)); 1195 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); 1196 } 1197 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; 1198 1199 xlog_get_iclog_buffer_size(mp, log); 1200 1201 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1202 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1203 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1204 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1205 ASSERT(XFS_BUF_ISBUSY(bp)); 1206 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); 1207 log->l_xbuf = bp; 1208 1209 spinlock_init(&log->l_icloglock, "iclog"); 1210 spinlock_init(&log->l_grant_lock, "grhead_iclog"); 1211 initnsema(&log->l_flushsema, 0, "ic-flush"); 1212 xlog_state_ticket_alloc(log); /* wait until after icloglock inited */ 1213 1214 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ 1215 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); 1216 1217 iclogp = &log->l_iclog; 1218 /* 1219 * The amount of memory to allocate for the iclog structure is 1220 * rather funky due to the way the structure is defined. It is 1221 * done this way so that we can use different sizes for machines 1222 * with different amounts of memory. See the definition of 1223 * xlog_in_core_t in xfs_log_priv.h for details. 1224 */ 1225 iclogsize = log->l_iclog_size; 1226 ASSERT(log->l_iclog_size >= 4096); 1227 for (i=0; i < log->l_iclog_bufs; i++) { 1228 *iclogp = (xlog_in_core_t *) 1229 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP); 1230 iclog = *iclogp; 1231 iclog->hic_data = (xlog_in_core_2_t *) 1232 kmem_zalloc(iclogsize, KM_SLEEP); 1233 1234 iclog->ic_prev = prev_iclog; 1235 prev_iclog = iclog; 1236 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); 1237 1238 head = &iclog->ic_header; 1239 memset(head, 0, sizeof(xlog_rec_header_t)); 1240 INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); 1241 INT_SET(head->h_version, ARCH_CONVERT, 1242 XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); 1243 INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size); 1244 /* new fields */ 1245 INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT); 1246 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); 1247 1248 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); 1249 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); 1250 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); 1251 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); 1252 iclog->ic_bp = bp; 1253 1254 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; 1255 iclog->ic_state = XLOG_STATE_ACTIVE; 1256 iclog->ic_log = log; 1257 iclog->ic_callback_tail = &(iclog->ic_callback); 1258 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize; 1259 1260 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); 1261 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); 1262 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force"); 1263 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write"); 1264 1265 iclogp = &iclog->ic_next; 1266 } 1267 *iclogp = log->l_iclog; /* complete ring */ 1268 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ 1269 1270 return log; 1271 } /* xlog_alloc_log */ 1272 1273 1274 /* 1275 * Write out the commit record of a transaction associated with the given 1276 * ticket. Return the lsn of the commit record. 1277 */ 1278 STATIC int 1279 xlog_commit_record(xfs_mount_t *mp, 1280 xlog_ticket_t *ticket, 1281 xlog_in_core_t **iclog, 1282 xfs_lsn_t *commitlsnp) 1283 { 1284 int error; 1285 xfs_log_iovec_t reg[1]; 1286 1287 reg[0].i_addr = NULL; 1288 reg[0].i_len = 0; 1289 XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); 1290 1291 ASSERT_ALWAYS(iclog); 1292 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, 1293 iclog, XLOG_COMMIT_TRANS))) { 1294 xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); 1295 } 1296 return (error); 1297 } /* xlog_commit_record */ 1298 1299 1300 /* 1301 * Push on the buffer cache code if we ever use more than 75% of the on-disk 1302 * log space. This code pushes on the lsn which would supposedly free up 1303 * the 25% which we want to leave free. We may need to adopt a policy which 1304 * pushes on an lsn which is further along in the log once we reach the high 1305 * water mark. In this manner, we would be creating a low water mark. 1306 */ 1307 void 1308 xlog_grant_push_ail(xfs_mount_t *mp, 1309 int need_bytes) 1310 { 1311 xlog_t *log = mp->m_log; /* pointer to the log */ 1312 xfs_lsn_t tail_lsn; /* lsn of the log tail */ 1313 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ 1314 int free_blocks; /* free blocks left to write to */ 1315 int free_bytes; /* free bytes left to write to */ 1316 int threshold_block; /* block in lsn we'd like to be at */ 1317 int threshold_cycle; /* lsn cycle we'd like to be at */ 1318 int free_threshold; 1319 SPLDECL(s); 1320 1321 ASSERT(BTOBB(need_bytes) < log->l_logBBsize); 1322 1323 s = GRANT_LOCK(log); 1324 free_bytes = xlog_space_left(log, 1325 log->l_grant_reserve_cycle, 1326 log->l_grant_reserve_bytes); 1327 tail_lsn = log->l_tail_lsn; 1328 free_blocks = BTOBBT(free_bytes); 1329 1330 /* 1331 * Set the threshold for the minimum number of free blocks in the 1332 * log to the maximum of what the caller needs, one quarter of the 1333 * log, and 256 blocks. 1334 */ 1335 free_threshold = BTOBB(need_bytes); 1336 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); 1337 free_threshold = MAX(free_threshold, 256); 1338 if (free_blocks < free_threshold) { 1339 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; 1340 threshold_cycle = CYCLE_LSN(tail_lsn); 1341 if (threshold_block >= log->l_logBBsize) { 1342 threshold_block -= log->l_logBBsize; 1343 threshold_cycle += 1; 1344 } 1345 ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle, 1346 threshold_block); 1347 1348 /* Don't pass in an lsn greater than the lsn of the last 1349 * log record known to be on disk. 1350 */ 1351 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) 1352 threshold_lsn = log->l_last_sync_lsn; 1353 } 1354 GRANT_UNLOCK(log, s); 1355 1356 /* 1357 * Get the transaction layer to kick the dirty buffers out to 1358 * disk asynchronously. No point in trying to do this if 1359 * the filesystem is shutting down. 1360 */ 1361 if (threshold_lsn && 1362 !XLOG_FORCED_SHUTDOWN(log)) 1363 xfs_trans_push_ail(mp, threshold_lsn); 1364 } /* xlog_grant_push_ail */ 1365 1366 1367 /* 1368 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous 1369 * fashion. Previously, we should have moved the current iclog 1370 * ptr in the log to point to the next available iclog. This allows further 1371 * write to continue while this code syncs out an iclog ready to go. 1372 * Before an in-core log can be written out, the data section must be scanned 1373 * to save away the 1st word of each BBSIZE block into the header. We replace 1374 * it with the current cycle count. Each BBSIZE block is tagged with the 1375 * cycle count because there in an implicit assumption that drives will 1376 * guarantee that entire 512 byte blocks get written at once. In other words, 1377 * we can't have part of a 512 byte block written and part not written. By 1378 * tagging each block, we will know which blocks are valid when recovering 1379 * after an unclean shutdown. 1380 * 1381 * This routine is single threaded on the iclog. No other thread can be in 1382 * this routine with the same iclog. Changing contents of iclog can there- 1383 * fore be done without grabbing the state machine lock. Updating the global 1384 * log will require grabbing the lock though. 1385 * 1386 * The entire log manager uses a logical block numbering scheme. Only 1387 * log_sync (and then only bwrite()) know about the fact that the log may 1388 * not start with block zero on a given device. The log block start offset 1389 * is added immediately before calling bwrite(). 1390 */ 1391 1392 int 1393 xlog_sync(xlog_t *log, 1394 xlog_in_core_t *iclog) 1395 { 1396 xfs_caddr_t dptr; /* pointer to byte sized element */ 1397 xfs_buf_t *bp; 1398 int i, ops; 1399 uint count; /* byte count of bwrite */ 1400 uint count_init; /* initial count before roundup */ 1401 int roundoff; /* roundoff to BB or stripe */ 1402 int split = 0; /* split write into two regions */ 1403 int error; 1404 SPLDECL(s); 1405 int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb); 1406 1407 XFS_STATS_INC(xs_log_writes); 1408 ASSERT(iclog->ic_refcnt == 0); 1409 1410 /* Add for LR header */ 1411 count_init = log->l_iclog_hsize + iclog->ic_offset; 1412 1413 /* Round out the log write size */ 1414 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { 1415 /* we have a v2 stripe unit to use */ 1416 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); 1417 } else { 1418 count = BBTOB(BTOBB(count_init)); 1419 } 1420 roundoff = count - count_init; 1421 ASSERT(roundoff >= 0); 1422 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && 1423 roundoff < log->l_mp->m_sb.sb_logsunit) 1424 || 1425 (log->l_mp->m_sb.sb_logsunit <= 1 && 1426 roundoff < BBTOB(1))); 1427 1428 /* move grant heads by roundoff in sync */ 1429 s = GRANT_LOCK(log); 1430 XLOG_GRANT_ADD_SPACE(log, roundoff, 'w'); 1431 XLOG_GRANT_ADD_SPACE(log, roundoff, 'r'); 1432 GRANT_UNLOCK(log, s); 1433 1434 /* put cycle number in every block */ 1435 xlog_pack_data(log, iclog, roundoff); 1436 1437 /* real byte length */ 1438 if (v2) { 1439 INT_SET(iclog->ic_header.h_len, 1440 ARCH_CONVERT, 1441 iclog->ic_offset + roundoff); 1442 } else { 1443 INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset); 1444 } 1445 1446 /* put ops count in correct order */ 1447 ops = iclog->ic_header.h_num_logops; 1448 INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops); 1449 1450 bp = iclog->ic_bp; 1451 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); 1452 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1453 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT))); 1454 1455 XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); 1456 1457 /* Do we need to split this write into 2 parts? */ 1458 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { 1459 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); 1460 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); 1461 iclog->ic_bwritecnt = 2; /* split into 2 writes */ 1462 } else { 1463 iclog->ic_bwritecnt = 1; 1464 } 1465 XFS_BUF_SET_PTR(bp, (xfs_caddr_t) &(iclog->ic_header), count); 1466 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ 1467 XFS_BUF_BUSY(bp); 1468 XFS_BUF_ASYNC(bp); 1469 /* 1470 * Do a disk write cache flush for the log block. 1471 * This is a bit of a sledgehammer, it would be better 1472 * to use a tag barrier here that just prevents reordering. 1473 * It may not be needed to flush the first split block in the log wrap 1474 * case, but do it anyways to be safe -AK 1475 */ 1476 if (!(log->l_mp->m_flags & XFS_MOUNT_NOLOGFLUSH)) 1477 XFS_BUF_FLUSH(bp); 1478 1479 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1480 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1481 1482 xlog_verify_iclog(log, iclog, count, B_TRUE); 1483 1484 /* account for log which doesn't start at block #0 */ 1485 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1486 /* 1487 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem 1488 * is shutting down. 1489 */ 1490 XFS_BUF_WRITE(bp); 1491 1492 if ((error = XFS_bwrite(bp))) { 1493 xfs_ioerror_alert("xlog_sync", log->l_mp, bp, 1494 XFS_BUF_ADDR(bp)); 1495 return (error); 1496 } 1497 if (split) { 1498 bp = iclog->ic_log->l_xbuf; 1499 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == 1500 (unsigned long)1); 1501 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); 1502 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ 1503 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ 1504 (__psint_t)count), split); 1505 XFS_BUF_SET_FSPRIVATE(bp, iclog); 1506 XFS_BUF_BUSY(bp); 1507 XFS_BUF_ASYNC(bp); 1508 if (!(log->l_mp->m_flags & XFS_MOUNT_NOLOGFLUSH)) 1509 XFS_BUF_FLUSH(bp); 1510 dptr = XFS_BUF_PTR(bp); 1511 /* 1512 * Bump the cycle numbers at the start of each block 1513 * since this part of the buffer is at the start of 1514 * a new cycle. Watch out for the header magic number 1515 * case, though. 1516 */ 1517 for (i=0; i<split; i += BBSIZE) { 1518 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1519 if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 1520 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); 1521 dptr += BBSIZE; 1522 } 1523 1524 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); 1525 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); 1526 1527 /* account for internal log which does't start at block #0 */ 1528 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); 1529 XFS_BUF_WRITE(bp); 1530 if ((error = XFS_bwrite(bp))) { 1531 xfs_ioerror_alert("xlog_sync (split)", log->l_mp, 1532 bp, XFS_BUF_ADDR(bp)); 1533 return (error); 1534 } 1535 } 1536 return (0); 1537 } /* xlog_sync */ 1538 1539 1540 /* 1541 * Unallocate a log structure 1542 */ 1543 void 1544 xlog_unalloc_log(xlog_t *log) 1545 { 1546 xlog_in_core_t *iclog, *next_iclog; 1547 xlog_ticket_t *tic, *next_tic; 1548 int i; 1549 1550 1551 iclog = log->l_iclog; 1552 for (i=0; i<log->l_iclog_bufs; i++) { 1553 sv_destroy(&iclog->ic_forcesema); 1554 sv_destroy(&iclog->ic_writesema); 1555 xfs_buf_free(iclog->ic_bp); 1556 #ifdef XFS_LOG_TRACE 1557 if (iclog->ic_trace != NULL) { 1558 ktrace_free(iclog->ic_trace); 1559 } 1560 #endif 1561 next_iclog = iclog->ic_next; 1562 kmem_free(iclog->hic_data, log->l_iclog_size); 1563 kmem_free(iclog, sizeof(xlog_in_core_t)); 1564 iclog = next_iclog; 1565 } 1566 freesema(&log->l_flushsema); 1567 spinlock_destroy(&log->l_icloglock); 1568 spinlock_destroy(&log->l_grant_lock); 1569 1570 /* XXXsup take a look at this again. */ 1571 if ((log->l_ticket_cnt != log->l_ticket_tcnt) && 1572 !XLOG_FORCED_SHUTDOWN(log)) { 1573 xfs_fs_cmn_err(CE_WARN, log->l_mp, 1574 "xlog_unalloc_log: (cnt: %d, total: %d)", 1575 log->l_ticket_cnt, log->l_ticket_tcnt); 1576 /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */ 1577 1578 } else { 1579 tic = log->l_unmount_free; 1580 while (tic) { 1581 next_tic = tic->t_next; 1582 kmem_free(tic, NBPP); 1583 tic = next_tic; 1584 } 1585 } 1586 xfs_buf_free(log->l_xbuf); 1587 #ifdef XFS_LOG_TRACE 1588 if (log->l_trace != NULL) { 1589 ktrace_free(log->l_trace); 1590 } 1591 if (log->l_grant_trace != NULL) { 1592 ktrace_free(log->l_grant_trace); 1593 } 1594 #endif 1595 log->l_mp->m_log = NULL; 1596 kmem_free(log, sizeof(xlog_t)); 1597 } /* xlog_unalloc_log */ 1598 1599 /* 1600 * Update counters atomically now that memcpy is done. 1601 */ 1602 /* ARGSUSED */ 1603 static inline void 1604 xlog_state_finish_copy(xlog_t *log, 1605 xlog_in_core_t *iclog, 1606 int record_cnt, 1607 int copy_bytes) 1608 { 1609 SPLDECL(s); 1610 1611 s = LOG_LOCK(log); 1612 1613 iclog->ic_header.h_num_logops += record_cnt; 1614 iclog->ic_offset += copy_bytes; 1615 1616 LOG_UNLOCK(log, s); 1617 } /* xlog_state_finish_copy */ 1618 1619 1620 1621 1622 /* 1623 * print out info relating to regions written which consume 1624 * the reservation 1625 */ 1626 #if defined(XFS_LOG_RES_DEBUG) 1627 STATIC void 1628 xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) 1629 { 1630 uint i; 1631 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); 1632 1633 /* match with XLOG_REG_TYPE_* in xfs_log.h */ 1634 static char *res_type_str[XLOG_REG_TYPE_MAX] = { 1635 "bformat", 1636 "bchunk", 1637 "efi_format", 1638 "efd_format", 1639 "iformat", 1640 "icore", 1641 "iext", 1642 "ibroot", 1643 "ilocal", 1644 "iattr_ext", 1645 "iattr_broot", 1646 "iattr_local", 1647 "qformat", 1648 "dquot", 1649 "quotaoff", 1650 "LR header", 1651 "unmount", 1652 "commit", 1653 "trans header" 1654 }; 1655 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { 1656 "SETATTR_NOT_SIZE", 1657 "SETATTR_SIZE", 1658 "INACTIVE", 1659 "CREATE", 1660 "CREATE_TRUNC", 1661 "TRUNCATE_FILE", 1662 "REMOVE", 1663 "LINK", 1664 "RENAME", 1665 "MKDIR", 1666 "RMDIR", 1667 "SYMLINK", 1668 "SET_DMATTRS", 1669 "GROWFS", 1670 "STRAT_WRITE", 1671 "DIOSTRAT", 1672 "WRITE_SYNC", 1673 "WRITEID", 1674 "ADDAFORK", 1675 "ATTRINVAL", 1676 "ATRUNCATE", 1677 "ATTR_SET", 1678 "ATTR_RM", 1679 "ATTR_FLAG", 1680 "CLEAR_AGI_BUCKET", 1681 "QM_SBCHANGE", 1682 "DUMMY1", 1683 "DUMMY2", 1684 "QM_QUOTAOFF", 1685 "QM_DQALLOC", 1686 "QM_SETQLIM", 1687 "QM_DQCLUSTER", 1688 "QM_QINOCREATE", 1689 "QM_QUOTAOFF_END", 1690 "SB_UNIT", 1691 "FSYNC_TS", 1692 "GROWFSRT_ALLOC", 1693 "GROWFSRT_ZERO", 1694 "GROWFSRT_FREE", 1695 "SWAPEXT" 1696 }; 1697 1698 xfs_fs_cmn_err(CE_WARN, mp, 1699 "xfs_log_write: reservation summary:\n" 1700 " trans type = %s (%u)\n" 1701 " unit res = %d bytes\n" 1702 " current res = %d bytes\n" 1703 " total reg = %u bytes (o/flow = %u bytes)\n" 1704 " ophdrs = %u (ophdr space = %u bytes)\n" 1705 " ophdr + reg = %u bytes\n" 1706 " num regions = %u\n", 1707 ((ticket->t_trans_type <= 0 || 1708 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? 1709 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), 1710 ticket->t_trans_type, 1711 ticket->t_unit_res, 1712 ticket->t_curr_res, 1713 ticket->t_res_arr_sum, ticket->t_res_o_flow, 1714 ticket->t_res_num_ophdrs, ophdr_spc, 1715 ticket->t_res_arr_sum + 1716 ticket->t_res_o_flow + ophdr_spc, 1717 ticket->t_res_num); 1718 1719 for (i = 0; i < ticket->t_res_num; i++) { 1720 uint r_type = ticket->t_res_arr[i].r_type; 1721 cmn_err(CE_WARN, 1722 "region[%u]: %s - %u bytes\n", 1723 i, 1724 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? 1725 "bad-rtype" : res_type_str[r_type-1]), 1726 ticket->t_res_arr[i].r_len); 1727 } 1728 } 1729 #else 1730 #define xlog_print_tic_res(mp, ticket) 1731 #endif 1732 1733 /* 1734 * Write some region out to in-core log 1735 * 1736 * This will be called when writing externally provided regions or when 1737 * writing out a commit record for a given transaction. 1738 * 1739 * General algorithm: 1740 * 1. Find total length of this write. This may include adding to the 1741 * lengths passed in. 1742 * 2. Check whether we violate the tickets reservation. 1743 * 3. While writing to this iclog 1744 * A. Reserve as much space in this iclog as can get 1745 * B. If this is first write, save away start lsn 1746 * C. While writing this region: 1747 * 1. If first write of transaction, write start record 1748 * 2. Write log operation header (header per region) 1749 * 3. Find out if we can fit entire region into this iclog 1750 * 4. Potentially, verify destination memcpy ptr 1751 * 5. Memcpy (partial) region 1752 * 6. If partial copy, release iclog; otherwise, continue 1753 * copying more regions into current iclog 1754 * 4. Mark want sync bit (in simulation mode) 1755 * 5. Release iclog for potential flush to on-disk log. 1756 * 1757 * ERRORS: 1758 * 1. Panic if reservation is overrun. This should never happen since 1759 * reservation amounts are generated internal to the filesystem. 1760 * NOTES: 1761 * 1. Tickets are single threaded data structures. 1762 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the 1763 * syncing routine. When a single log_write region needs to span 1764 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set 1765 * on all log operation writes which don't contain the end of the 1766 * region. The XLOG_END_TRANS bit is used for the in-core log 1767 * operation which contains the end of the continued log_write region. 1768 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, 1769 * we don't really know exactly how much space will be used. As a result, 1770 * we don't update ic_offset until the end when we know exactly how many 1771 * bytes have been written out. 1772 */ 1773 int 1774 xlog_write(xfs_mount_t * mp, 1775 xfs_log_iovec_t reg[], 1776 int nentries, 1777 xfs_log_ticket_t tic, 1778 xfs_lsn_t *start_lsn, 1779 xlog_in_core_t **commit_iclog, 1780 uint flags) 1781 { 1782 xlog_t *log = mp->m_log; 1783 xlog_ticket_t *ticket = (xlog_ticket_t *)tic; 1784 xlog_op_header_t *logop_head; /* ptr to log operation header */ 1785 xlog_in_core_t *iclog; /* ptr to current in-core log */ 1786 __psint_t ptr; /* copy address into data region */ 1787 int len; /* # xlog_write() bytes 2 still copy */ 1788 int index; /* region index currently copying */ 1789 int log_offset; /* offset (from 0) into data region */ 1790 int start_rec_copy; /* # bytes to copy for start record */ 1791 int partial_copy; /* did we split a region? */ 1792 int partial_copy_len;/* # bytes copied if split region */ 1793 int need_copy; /* # bytes need to memcpy this region */ 1794 int copy_len; /* # bytes actually memcpy'ing */ 1795 int copy_off; /* # bytes from entry start */ 1796 int contwr; /* continued write of in-core log? */ 1797 int error; 1798 int record_cnt = 0, data_cnt = 0; 1799 1800 partial_copy_len = partial_copy = 0; 1801 1802 /* Calculate potential maximum space. Each region gets its own 1803 * xlog_op_header_t and may need to be double word aligned. 1804 */ 1805 len = 0; 1806 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ 1807 len += sizeof(xlog_op_header_t); 1808 XLOG_TIC_ADD_OPHDR(ticket); 1809 } 1810 1811 for (index = 0; index < nentries; index++) { 1812 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ 1813 XLOG_TIC_ADD_OPHDR(ticket); 1814 len += reg[index].i_len; 1815 XLOG_TIC_ADD_REGION(ticket, reg[index].i_len, reg[index].i_type); 1816 } 1817 contwr = *start_lsn = 0; 1818 1819 if (ticket->t_curr_res < len) { 1820 xlog_print_tic_res(mp, ticket); 1821 #ifdef DEBUG 1822 xlog_panic( 1823 "xfs_log_write: reservation ran out. Need to up reservation"); 1824 #else 1825 /* Customer configurable panic */ 1826 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, 1827 "xfs_log_write: reservation ran out. Need to up reservation"); 1828 /* If we did not panic, shutdown the filesystem */ 1829 xfs_force_shutdown(mp, XFS_CORRUPT_INCORE); 1830 #endif 1831 } else 1832 ticket->t_curr_res -= len; 1833 1834 for (index = 0; index < nentries; ) { 1835 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, 1836 &contwr, &log_offset))) 1837 return (error); 1838 1839 ASSERT(log_offset <= iclog->ic_size - 1); 1840 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); 1841 1842 /* start_lsn is the first lsn written to. That's all we need. */ 1843 if (! *start_lsn) 1844 *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 1845 1846 /* This loop writes out as many regions as can fit in the amount 1847 * of space which was allocated by xlog_state_get_iclog_space(). 1848 */ 1849 while (index < nentries) { 1850 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); 1851 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); 1852 start_rec_copy = 0; 1853 1854 /* If first write for transaction, insert start record. 1855 * We can't be trying to commit if we are inited. We can't 1856 * have any "partial_copy" if we are inited. 1857 */ 1858 if (ticket->t_flags & XLOG_TIC_INITED) { 1859 logop_head = (xlog_op_header_t *)ptr; 1860 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1861 logop_head->oh_clientid = ticket->t_clientid; 1862 logop_head->oh_len = 0; 1863 logop_head->oh_flags = XLOG_START_TRANS; 1864 logop_head->oh_res2 = 0; 1865 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ 1866 record_cnt++; 1867 1868 start_rec_copy = sizeof(xlog_op_header_t); 1869 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); 1870 } 1871 1872 /* Copy log operation header directly into data section */ 1873 logop_head = (xlog_op_header_t *)ptr; 1874 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); 1875 logop_head->oh_clientid = ticket->t_clientid; 1876 logop_head->oh_res2 = 0; 1877 1878 /* header copied directly */ 1879 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); 1880 1881 /* are we copying a commit or unmount record? */ 1882 logop_head->oh_flags = flags; 1883 1884 /* 1885 * We've seen logs corrupted with bad transaction client 1886 * ids. This makes sure that XFS doesn't generate them on. 1887 * Turn this into an EIO and shut down the filesystem. 1888 */ 1889 switch (logop_head->oh_clientid) { 1890 case XFS_TRANSACTION: 1891 case XFS_VOLUME: 1892 case XFS_LOG: 1893 break; 1894 default: 1895 xfs_fs_cmn_err(CE_WARN, mp, 1896 "Bad XFS transaction clientid 0x%x in ticket 0x%p", 1897 logop_head->oh_clientid, tic); 1898 return XFS_ERROR(EIO); 1899 } 1900 1901 /* Partial write last time? => (partial_copy != 0) 1902 * need_copy is the amount we'd like to copy if everything could 1903 * fit in the current memcpy. 1904 */ 1905 need_copy = reg[index].i_len - partial_copy_len; 1906 1907 copy_off = partial_copy_len; 1908 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ 1909 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy); 1910 if (partial_copy) 1911 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); 1912 partial_copy_len = partial_copy = 0; 1913 } else { /* partial write */ 1914 copy_len = iclog->ic_size - log_offset; 1915 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len); 1916 logop_head->oh_flags |= XLOG_CONTINUE_TRANS; 1917 if (partial_copy) 1918 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; 1919 partial_copy_len += copy_len; 1920 partial_copy++; 1921 len += sizeof(xlog_op_header_t); /* from splitting of region */ 1922 /* account for new log op header */ 1923 ticket->t_curr_res -= sizeof(xlog_op_header_t); 1924 XLOG_TIC_ADD_OPHDR(ticket); 1925 } 1926 xlog_verify_dest_ptr(log, ptr); 1927 1928 /* copy region */ 1929 ASSERT(copy_len >= 0); 1930 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); 1931 xlog_write_adv_cnt(ptr, len, log_offset, copy_len); 1932 1933 /* make copy_len total bytes copied, including headers */ 1934 copy_len += start_rec_copy + sizeof(xlog_op_header_t); 1935 record_cnt++; 1936 data_cnt += contwr ? copy_len : 0; 1937 if (partial_copy) { /* copied partial region */ 1938 /* already marked WANT_SYNC by xlog_state_get_iclog_space */ 1939 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1940 record_cnt = data_cnt = 0; 1941 if ((error = xlog_state_release_iclog(log, iclog))) 1942 return (error); 1943 break; /* don't increment index */ 1944 } else { /* copied entire region */ 1945 index++; 1946 partial_copy_len = partial_copy = 0; 1947 1948 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { 1949 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1950 record_cnt = data_cnt = 0; 1951 xlog_state_want_sync(log, iclog); 1952 if (commit_iclog) { 1953 ASSERT(flags & XLOG_COMMIT_TRANS); 1954 *commit_iclog = iclog; 1955 } else if ((error = xlog_state_release_iclog(log, iclog))) 1956 return (error); 1957 if (index == nentries) 1958 return 0; /* we are done */ 1959 else 1960 break; 1961 } 1962 } /* if (partial_copy) */ 1963 } /* while (index < nentries) */ 1964 } /* for (index = 0; index < nentries; ) */ 1965 ASSERT(len == 0); 1966 1967 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); 1968 if (commit_iclog) { 1969 ASSERT(flags & XLOG_COMMIT_TRANS); 1970 *commit_iclog = iclog; 1971 return 0; 1972 } 1973 return (xlog_state_release_iclog(log, iclog)); 1974 } /* xlog_write */ 1975 1976 1977 /***************************************************************************** 1978 * 1979 * State Machine functions 1980 * 1981 ***************************************************************************** 1982 */ 1983 1984 /* Clean iclogs starting from the head. This ordering must be 1985 * maintained, so an iclog doesn't become ACTIVE beyond one that 1986 * is SYNCING. This is also required to maintain the notion that we use 1987 * a counting semaphore to hold off would be writers to the log when every 1988 * iclog is trying to sync to disk. 1989 * 1990 * State Change: DIRTY -> ACTIVE 1991 */ 1992 STATIC void 1993 xlog_state_clean_log(xlog_t *log) 1994 { 1995 xlog_in_core_t *iclog; 1996 int changed = 0; 1997 1998 iclog = log->l_iclog; 1999 do { 2000 if (iclog->ic_state == XLOG_STATE_DIRTY) { 2001 iclog->ic_state = XLOG_STATE_ACTIVE; 2002 iclog->ic_offset = 0; 2003 iclog->ic_callback = NULL; /* don't need to free */ 2004 /* 2005 * If the number of ops in this iclog indicate it just 2006 * contains the dummy transaction, we can 2007 * change state into IDLE (the second time around). 2008 * Otherwise we should change the state into 2009 * NEED a dummy. 2010 * We don't need to cover the dummy. 2011 */ 2012 if (!changed && 2013 (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) { 2014 changed = 1; 2015 } else { 2016 /* 2017 * We have two dirty iclogs so start over 2018 * This could also be num of ops indicates 2019 * this is not the dummy going out. 2020 */ 2021 changed = 2; 2022 } 2023 iclog->ic_header.h_num_logops = 0; 2024 memset(iclog->ic_header.h_cycle_data, 0, 2025 sizeof(iclog->ic_header.h_cycle_data)); 2026 iclog->ic_header.h_lsn = 0; 2027 } else if (iclog->ic_state == XLOG_STATE_ACTIVE) 2028 /* do nothing */; 2029 else 2030 break; /* stop cleaning */ 2031 iclog = iclog->ic_next; 2032 } while (iclog != log->l_iclog); 2033 2034 /* log is locked when we are called */ 2035 /* 2036 * Change state for the dummy log recording. 2037 * We usually go to NEED. But we go to NEED2 if the changed indicates 2038 * we are done writing the dummy record. 2039 * If we are done with the second dummy recored (DONE2), then 2040 * we go to IDLE. 2041 */ 2042 if (changed) { 2043 switch (log->l_covered_state) { 2044 case XLOG_STATE_COVER_IDLE: 2045 case XLOG_STATE_COVER_NEED: 2046 case XLOG_STATE_COVER_NEED2: 2047 log->l_covered_state = XLOG_STATE_COVER_NEED; 2048 break; 2049 2050 case XLOG_STATE_COVER_DONE: 2051 if (changed == 1) 2052 log->l_covered_state = XLOG_STATE_COVER_NEED2; 2053 else 2054 log->l_covered_state = XLOG_STATE_COVER_NEED; 2055 break; 2056 2057 case XLOG_STATE_COVER_DONE2: 2058 if (changed == 1) 2059 log->l_covered_state = XLOG_STATE_COVER_IDLE; 2060 else 2061 log->l_covered_state = XLOG_STATE_COVER_NEED; 2062 break; 2063 2064 default: 2065 ASSERT(0); 2066 } 2067 } 2068 } /* xlog_state_clean_log */ 2069 2070 STATIC xfs_lsn_t 2071 xlog_get_lowest_lsn( 2072 xlog_t *log) 2073 { 2074 xlog_in_core_t *lsn_log; 2075 xfs_lsn_t lowest_lsn, lsn; 2076 2077 lsn_log = log->l_iclog; 2078 lowest_lsn = 0; 2079 do { 2080 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { 2081 lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT); 2082 if ((lsn && !lowest_lsn) || 2083 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { 2084 lowest_lsn = lsn; 2085 } 2086 } 2087 lsn_log = lsn_log->ic_next; 2088 } while (lsn_log != log->l_iclog); 2089 return(lowest_lsn); 2090 } 2091 2092 2093 STATIC void 2094 xlog_state_do_callback( 2095 xlog_t *log, 2096 int aborted, 2097 xlog_in_core_t *ciclog) 2098 { 2099 xlog_in_core_t *iclog; 2100 xlog_in_core_t *first_iclog; /* used to know when we've 2101 * processed all iclogs once */ 2102 xfs_log_callback_t *cb, *cb_next; 2103 int flushcnt = 0; 2104 xfs_lsn_t lowest_lsn; 2105 int ioerrors; /* counter: iclogs with errors */ 2106 int loopdidcallbacks; /* flag: inner loop did callbacks*/ 2107 int funcdidcallbacks; /* flag: function did callbacks */ 2108 int repeats; /* for issuing console warnings if 2109 * looping too many times */ 2110 SPLDECL(s); 2111 2112 s = LOG_LOCK(log); 2113 first_iclog = iclog = log->l_iclog; 2114 ioerrors = 0; 2115 funcdidcallbacks = 0; 2116 repeats = 0; 2117 2118 do { 2119 /* 2120 * Scan all iclogs starting with the one pointed to by the 2121 * log. Reset this starting point each time the log is 2122 * unlocked (during callbacks). 2123 * 2124 * Keep looping through iclogs until one full pass is made 2125 * without running any callbacks. 2126 */ 2127 first_iclog = log->l_iclog; 2128 iclog = log->l_iclog; 2129 loopdidcallbacks = 0; 2130 repeats++; 2131 2132 do { 2133 2134 /* skip all iclogs in the ACTIVE & DIRTY states */ 2135 if (iclog->ic_state & 2136 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { 2137 iclog = iclog->ic_next; 2138 continue; 2139 } 2140 2141 /* 2142 * Between marking a filesystem SHUTDOWN and stopping 2143 * the log, we do flush all iclogs to disk (if there 2144 * wasn't a log I/O error). So, we do want things to 2145 * go smoothly in case of just a SHUTDOWN w/o a 2146 * LOG_IO_ERROR. 2147 */ 2148 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { 2149 /* 2150 * Can only perform callbacks in order. Since 2151 * this iclog is not in the DONE_SYNC/ 2152 * DO_CALLBACK state, we skip the rest and 2153 * just try to clean up. If we set our iclog 2154 * to DO_CALLBACK, we will not process it when 2155 * we retry since a previous iclog is in the 2156 * CALLBACK and the state cannot change since 2157 * we are holding the LOG_LOCK. 2158 */ 2159 if (!(iclog->ic_state & 2160 (XLOG_STATE_DONE_SYNC | 2161 XLOG_STATE_DO_CALLBACK))) { 2162 if (ciclog && (ciclog->ic_state == 2163 XLOG_STATE_DONE_SYNC)) { 2164 ciclog->ic_state = XLOG_STATE_DO_CALLBACK; 2165 } 2166 break; 2167 } 2168 /* 2169 * We now have an iclog that is in either the 2170 * DO_CALLBACK or DONE_SYNC states. The other 2171 * states (WANT_SYNC, SYNCING, or CALLBACK were 2172 * caught by the above if and are going to 2173 * clean (i.e. we aren't doing their callbacks) 2174 * see the above if. 2175 */ 2176 2177 /* 2178 * We will do one more check here to see if we 2179 * have chased our tail around. 2180 */ 2181 2182 lowest_lsn = xlog_get_lowest_lsn(log); 2183 if (lowest_lsn && ( 2184 XFS_LSN_CMP( 2185 lowest_lsn, 2186 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2187 )<0)) { 2188 iclog = iclog->ic_next; 2189 continue; /* Leave this iclog for 2190 * another thread */ 2191 } 2192 2193 iclog->ic_state = XLOG_STATE_CALLBACK; 2194 2195 LOG_UNLOCK(log, s); 2196 2197 /* l_last_sync_lsn field protected by 2198 * GRANT_LOCK. Don't worry about iclog's lsn. 2199 * No one else can be here except us. 2200 */ 2201 s = GRANT_LOCK(log); 2202 ASSERT(XFS_LSN_CMP( 2203 log->l_last_sync_lsn, 2204 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) 2205 )<=0); 2206 log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2207 GRANT_UNLOCK(log, s); 2208 2209 /* 2210 * Keep processing entries in the callback list 2211 * until we come around and it is empty. We 2212 * need to atomically see that the list is 2213 * empty and change the state to DIRTY so that 2214 * we don't miss any more callbacks being added. 2215 */ 2216 s = LOG_LOCK(log); 2217 } else { 2218 ioerrors++; 2219 } 2220 cb = iclog->ic_callback; 2221 2222 while (cb != 0) { 2223 iclog->ic_callback_tail = &(iclog->ic_callback); 2224 iclog->ic_callback = NULL; 2225 LOG_UNLOCK(log, s); 2226 2227 /* perform callbacks in the order given */ 2228 for (; cb != 0; cb = cb_next) { 2229 cb_next = cb->cb_next; 2230 cb->cb_func(cb->cb_arg, aborted); 2231 } 2232 s = LOG_LOCK(log); 2233 cb = iclog->ic_callback; 2234 } 2235 2236 loopdidcallbacks++; 2237 funcdidcallbacks++; 2238 2239 ASSERT(iclog->ic_callback == 0); 2240 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) 2241 iclog->ic_state = XLOG_STATE_DIRTY; 2242 2243 /* 2244 * Transition from DIRTY to ACTIVE if applicable. 2245 * NOP if STATE_IOERROR. 2246 */ 2247 xlog_state_clean_log(log); 2248 2249 /* wake up threads waiting in xfs_log_force() */ 2250 sv_broadcast(&iclog->ic_forcesema); 2251 2252 iclog = iclog->ic_next; 2253 } while (first_iclog != iclog); 2254 if (repeats && (repeats % 10) == 0) { 2255 xfs_fs_cmn_err(CE_WARN, log->l_mp, 2256 "xlog_state_do_callback: looping %d", repeats); 2257 } 2258 } while (!ioerrors && loopdidcallbacks); 2259 2260 /* 2261 * make one last gasp attempt to see if iclogs are being left in 2262 * limbo.. 2263 */ 2264 #ifdef DEBUG 2265 if (funcdidcallbacks) { 2266 first_iclog = iclog = log->l_iclog; 2267 do { 2268 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); 2269 /* 2270 * Terminate the loop if iclogs are found in states 2271 * which will cause other threads to clean up iclogs. 2272 * 2273 * SYNCING - i/o completion will go through logs 2274 * DONE_SYNC - interrupt thread should be waiting for 2275 * LOG_LOCK 2276 * IOERROR - give up hope all ye who enter here 2277 */ 2278 if (iclog->ic_state == XLOG_STATE_WANT_SYNC || 2279 iclog->ic_state == XLOG_STATE_SYNCING || 2280 iclog->ic_state == XLOG_STATE_DONE_SYNC || 2281 iclog->ic_state == XLOG_STATE_IOERROR ) 2282 break; 2283 iclog = iclog->ic_next; 2284 } while (first_iclog != iclog); 2285 } 2286 #endif 2287 2288 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { 2289 flushcnt = log->l_flushcnt; 2290 log->l_flushcnt = 0; 2291 } 2292 LOG_UNLOCK(log, s); 2293 while (flushcnt--) 2294 vsema(&log->l_flushsema); 2295 } /* xlog_state_do_callback */ 2296 2297 2298 /* 2299 * Finish transitioning this iclog to the dirty state. 2300 * 2301 * Make sure that we completely execute this routine only when this is 2302 * the last call to the iclog. There is a good chance that iclog flushes, 2303 * when we reach the end of the physical log, get turned into 2 separate 2304 * calls to bwrite. Hence, one iclog flush could generate two calls to this 2305 * routine. By using the reference count bwritecnt, we guarantee that only 2306 * the second completion goes through. 2307 * 2308 * Callbacks could take time, so they are done outside the scope of the 2309 * global state machine log lock. Assume that the calls to cvsema won't 2310 * take a long time. At least we know it won't sleep. 2311 */ 2312 void 2313 xlog_state_done_syncing( 2314 xlog_in_core_t *iclog, 2315 int aborted) 2316 { 2317 xlog_t *log = iclog->ic_log; 2318 SPLDECL(s); 2319 2320 s = LOG_LOCK(log); 2321 2322 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || 2323 iclog->ic_state == XLOG_STATE_IOERROR); 2324 ASSERT(iclog->ic_refcnt == 0); 2325 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); 2326 2327 2328 /* 2329 * If we got an error, either on the first buffer, or in the case of 2330 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, 2331 * and none should ever be attempted to be written to disk 2332 * again. 2333 */ 2334 if (iclog->ic_state != XLOG_STATE_IOERROR) { 2335 if (--iclog->ic_bwritecnt == 1) { 2336 LOG_UNLOCK(log, s); 2337 return; 2338 } 2339 iclog->ic_state = XLOG_STATE_DONE_SYNC; 2340 } 2341 2342 /* 2343 * Someone could be sleeping prior to writing out the next 2344 * iclog buffer, we wake them all, one will get to do the 2345 * I/O, the others get to wait for the result. 2346 */ 2347 sv_broadcast(&iclog->ic_writesema); 2348 LOG_UNLOCK(log, s); 2349 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ 2350 } /* xlog_state_done_syncing */ 2351 2352 2353 /* 2354 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must 2355 * sleep. The flush semaphore is set to the number of in-core buffers and 2356 * decremented around disk syncing. Therefore, if all buffers are syncing, 2357 * this semaphore will cause new writes to sleep until a sync completes. 2358 * Otherwise, this code just does p() followed by v(). This approximates 2359 * a sleep/wakeup except we can't race. 2360 * 2361 * The in-core logs are used in a circular fashion. They are not used 2362 * out-of-order even when an iclog past the head is free. 2363 * 2364 * return: 2365 * * log_offset where xlog_write() can start writing into the in-core 2366 * log's data space. 2367 * * in-core log pointer to which xlog_write() should write. 2368 * * boolean indicating this is a continued write to an in-core log. 2369 * If this is the last write, then the in-core log's offset field 2370 * needs to be incremented, depending on the amount of data which 2371 * is copied. 2372 */ 2373 int 2374 xlog_state_get_iclog_space(xlog_t *log, 2375 int len, 2376 xlog_in_core_t **iclogp, 2377 xlog_ticket_t *ticket, 2378 int *continued_write, 2379 int *logoffsetp) 2380 { 2381 SPLDECL(s); 2382 int log_offset; 2383 xlog_rec_header_t *head; 2384 xlog_in_core_t *iclog; 2385 int error; 2386 2387 restart: 2388 s = LOG_LOCK(log); 2389 if (XLOG_FORCED_SHUTDOWN(log)) { 2390 LOG_UNLOCK(log, s); 2391 return XFS_ERROR(EIO); 2392 } 2393 2394 iclog = log->l_iclog; 2395 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { 2396 log->l_flushcnt++; 2397 LOG_UNLOCK(log, s); 2398 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); 2399 XFS_STATS_INC(xs_log_noiclogs); 2400 /* Ensure that log writes happen */ 2401 psema(&log->l_flushsema, PINOD); 2402 goto restart; 2403 } 2404 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2405 head = &iclog->ic_header; 2406 2407 iclog->ic_refcnt++; /* prevents sync */ 2408 log_offset = iclog->ic_offset; 2409 2410 /* On the 1st write to an iclog, figure out lsn. This works 2411 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are 2412 * committing to. If the offset is set, that's how many blocks 2413 * must be written. 2414 */ 2415 if (log_offset == 0) { 2416 ticket->t_curr_res -= log->l_iclog_hsize; 2417 XLOG_TIC_ADD_REGION(ticket, 2418 log->l_iclog_hsize, 2419 XLOG_REG_TYPE_LRHEADER); 2420 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle); 2421 ASSIGN_LSN(head->h_lsn, log); 2422 ASSERT(log->l_curr_block >= 0); 2423 } 2424 2425 /* If there is enough room to write everything, then do it. Otherwise, 2426 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC 2427 * bit is on, so this will get flushed out. Don't update ic_offset 2428 * until you know exactly how many bytes get copied. Therefore, wait 2429 * until later to update ic_offset. 2430 * 2431 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's 2432 * can fit into remaining data section. 2433 */ 2434 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { 2435 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2436 2437 /* If I'm the only one writing to this iclog, sync it to disk */ 2438 if (iclog->ic_refcnt == 1) { 2439 LOG_UNLOCK(log, s); 2440 if ((error = xlog_state_release_iclog(log, iclog))) 2441 return (error); 2442 } else { 2443 iclog->ic_refcnt--; 2444 LOG_UNLOCK(log, s); 2445 } 2446 goto restart; 2447 } 2448 2449 /* Do we have enough room to write the full amount in the remainder 2450 * of this iclog? Or must we continue a write on the next iclog and 2451 * mark this iclog as completely taken? In the case where we switch 2452 * iclogs (to mark it taken), this particular iclog will release/sync 2453 * to disk in xlog_write(). 2454 */ 2455 if (len <= iclog->ic_size - iclog->ic_offset) { 2456 *continued_write = 0; 2457 iclog->ic_offset += len; 2458 } else { 2459 *continued_write = 1; 2460 xlog_state_switch_iclogs(log, iclog, iclog->ic_size); 2461 } 2462 *iclogp = iclog; 2463 2464 ASSERT(iclog->ic_offset <= iclog->ic_size); 2465 LOG_UNLOCK(log, s); 2466 2467 *logoffsetp = log_offset; 2468 return 0; 2469 } /* xlog_state_get_iclog_space */ 2470 2471 /* 2472 * Atomically get the log space required for a log ticket. 2473 * 2474 * Once a ticket gets put onto the reserveq, it will only return after 2475 * the needed reservation is satisfied. 2476 */ 2477 STATIC int 2478 xlog_grant_log_space(xlog_t *log, 2479 xlog_ticket_t *tic) 2480 { 2481 int free_bytes; 2482 int need_bytes; 2483 SPLDECL(s); 2484 #ifdef DEBUG 2485 xfs_lsn_t tail_lsn; 2486 #endif 2487 2488 2489 #ifdef DEBUG 2490 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2491 panic("grant Recovery problem"); 2492 #endif 2493 2494 /* Is there space or do we need to sleep? */ 2495 s = GRANT_LOCK(log); 2496 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); 2497 2498 /* something is already sleeping; insert new transaction at end */ 2499 if (log->l_reserve_headq) { 2500 XLOG_INS_TICKETQ(log->l_reserve_headq, tic); 2501 xlog_trace_loggrant(log, tic, 2502 "xlog_grant_log_space: sleep 1"); 2503 /* 2504 * Gotta check this before going to sleep, while we're 2505 * holding the grant lock. 2506 */ 2507 if (XLOG_FORCED_SHUTDOWN(log)) 2508 goto error_return; 2509 2510 XFS_STATS_INC(xs_sleep_logspace); 2511 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2512 /* 2513 * If we got an error, and the filesystem is shutting down, 2514 * we'll catch it down below. So just continue... 2515 */ 2516 xlog_trace_loggrant(log, tic, 2517 "xlog_grant_log_space: wake 1"); 2518 s = GRANT_LOCK(log); 2519 } 2520 if (tic->t_flags & XFS_LOG_PERM_RESERV) 2521 need_bytes = tic->t_unit_res*tic->t_ocnt; 2522 else 2523 need_bytes = tic->t_unit_res; 2524 2525 redo: 2526 if (XLOG_FORCED_SHUTDOWN(log)) 2527 goto error_return; 2528 2529 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, 2530 log->l_grant_reserve_bytes); 2531 if (free_bytes < need_bytes) { 2532 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2533 XLOG_INS_TICKETQ(log->l_reserve_headq, tic); 2534 xlog_trace_loggrant(log, tic, 2535 "xlog_grant_log_space: sleep 2"); 2536 XFS_STATS_INC(xs_sleep_logspace); 2537 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2538 2539 if (XLOG_FORCED_SHUTDOWN(log)) { 2540 s = GRANT_LOCK(log); 2541 goto error_return; 2542 } 2543 2544 xlog_trace_loggrant(log, tic, 2545 "xlog_grant_log_space: wake 2"); 2546 xlog_grant_push_ail(log->l_mp, need_bytes); 2547 s = GRANT_LOCK(log); 2548 goto redo; 2549 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2550 XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); 2551 2552 /* we've got enough space */ 2553 XLOG_GRANT_ADD_SPACE(log, need_bytes, 'w'); 2554 XLOG_GRANT_ADD_SPACE(log, need_bytes, 'r'); 2555 #ifdef DEBUG 2556 tail_lsn = log->l_tail_lsn; 2557 /* 2558 * Check to make sure the grant write head didn't just over lap the 2559 * tail. If the cycles are the same, we can't be overlapping. 2560 * Otherwise, make sure that the cycles differ by exactly one and 2561 * check the byte count. 2562 */ 2563 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2564 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2565 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2566 } 2567 #endif 2568 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); 2569 xlog_verify_grant_head(log, 1); 2570 GRANT_UNLOCK(log, s); 2571 return 0; 2572 2573 error_return: 2574 if (tic->t_flags & XLOG_TIC_IN_Q) 2575 XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); 2576 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); 2577 /* 2578 * If we are failing, make sure the ticket doesn't have any 2579 * current reservations. We don't want to add this back when 2580 * the ticket/transaction gets cancelled. 2581 */ 2582 tic->t_curr_res = 0; 2583 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2584 GRANT_UNLOCK(log, s); 2585 return XFS_ERROR(EIO); 2586 } /* xlog_grant_log_space */ 2587 2588 2589 /* 2590 * Replenish the byte reservation required by moving the grant write head. 2591 * 2592 * 2593 */ 2594 STATIC int 2595 xlog_regrant_write_log_space(xlog_t *log, 2596 xlog_ticket_t *tic) 2597 { 2598 SPLDECL(s); 2599 int free_bytes, need_bytes; 2600 xlog_ticket_t *ntic; 2601 #ifdef DEBUG 2602 xfs_lsn_t tail_lsn; 2603 #endif 2604 2605 tic->t_curr_res = tic->t_unit_res; 2606 XLOG_TIC_RESET_RES(tic); 2607 2608 if (tic->t_cnt > 0) 2609 return (0); 2610 2611 #ifdef DEBUG 2612 if (log->l_flags & XLOG_ACTIVE_RECOVERY) 2613 panic("regrant Recovery problem"); 2614 #endif 2615 2616 s = GRANT_LOCK(log); 2617 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); 2618 2619 if (XLOG_FORCED_SHUTDOWN(log)) 2620 goto error_return; 2621 2622 /* If there are other waiters on the queue then give them a 2623 * chance at logspace before us. Wake up the first waiters, 2624 * if we do not wake up all the waiters then go to sleep waiting 2625 * for more free space, otherwise try to get some space for 2626 * this transaction. 2627 */ 2628 2629 if ((ntic = log->l_write_headq)) { 2630 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2631 log->l_grant_write_bytes); 2632 do { 2633 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); 2634 2635 if (free_bytes < ntic->t_unit_res) 2636 break; 2637 free_bytes -= ntic->t_unit_res; 2638 sv_signal(&ntic->t_sema); 2639 ntic = ntic->t_next; 2640 } while (ntic != log->l_write_headq); 2641 2642 if (ntic != log->l_write_headq) { 2643 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2644 XLOG_INS_TICKETQ(log->l_write_headq, tic); 2645 2646 xlog_trace_loggrant(log, tic, 2647 "xlog_regrant_write_log_space: sleep 1"); 2648 XFS_STATS_INC(xs_sleep_logspace); 2649 sv_wait(&tic->t_sema, PINOD|PLTWAIT, 2650 &log->l_grant_lock, s); 2651 2652 /* If we're shutting down, this tic is already 2653 * off the queue */ 2654 if (XLOG_FORCED_SHUTDOWN(log)) { 2655 s = GRANT_LOCK(log); 2656 goto error_return; 2657 } 2658 2659 xlog_trace_loggrant(log, tic, 2660 "xlog_regrant_write_log_space: wake 1"); 2661 xlog_grant_push_ail(log->l_mp, tic->t_unit_res); 2662 s = GRANT_LOCK(log); 2663 } 2664 } 2665 2666 need_bytes = tic->t_unit_res; 2667 2668 redo: 2669 if (XLOG_FORCED_SHUTDOWN(log)) 2670 goto error_return; 2671 2672 free_bytes = xlog_space_left(log, log->l_grant_write_cycle, 2673 log->l_grant_write_bytes); 2674 if (free_bytes < need_bytes) { 2675 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) 2676 XLOG_INS_TICKETQ(log->l_write_headq, tic); 2677 XFS_STATS_INC(xs_sleep_logspace); 2678 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); 2679 2680 /* If we're shutting down, this tic is already off the queue */ 2681 if (XLOG_FORCED_SHUTDOWN(log)) { 2682 s = GRANT_LOCK(log); 2683 goto error_return; 2684 } 2685 2686 xlog_trace_loggrant(log, tic, 2687 "xlog_regrant_write_log_space: wake 2"); 2688 xlog_grant_push_ail(log->l_mp, need_bytes); 2689 s = GRANT_LOCK(log); 2690 goto redo; 2691 } else if (tic->t_flags & XLOG_TIC_IN_Q) 2692 XLOG_DEL_TICKETQ(log->l_write_headq, tic); 2693 2694 XLOG_GRANT_ADD_SPACE(log, need_bytes, 'w'); /* we've got enough space */ 2695 #ifdef DEBUG 2696 tail_lsn = log->l_tail_lsn; 2697 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { 2698 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); 2699 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); 2700 } 2701 #endif 2702 2703 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); 2704 xlog_verify_grant_head(log, 1); 2705 GRANT_UNLOCK(log, s); 2706 return (0); 2707 2708 2709 error_return: 2710 if (tic->t_flags & XLOG_TIC_IN_Q) 2711 XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); 2712 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); 2713 /* 2714 * If we are failing, make sure the ticket doesn't have any 2715 * current reservations. We don't want to add this back when 2716 * the ticket/transaction gets cancelled. 2717 */ 2718 tic->t_curr_res = 0; 2719 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ 2720 GRANT_UNLOCK(log, s); 2721 return XFS_ERROR(EIO); 2722 } /* xlog_regrant_write_log_space */ 2723 2724 2725 /* The first cnt-1 times through here we don't need to 2726 * move the grant write head because the permanent 2727 * reservation has reserved cnt times the unit amount. 2728 * Release part of current permanent unit reservation and 2729 * reset current reservation to be one units worth. Also 2730 * move grant reservation head forward. 2731 */ 2732 STATIC void 2733 xlog_regrant_reserve_log_space(xlog_t *log, 2734 xlog_ticket_t *ticket) 2735 { 2736 SPLDECL(s); 2737 2738 xlog_trace_loggrant(log, ticket, 2739 "xlog_regrant_reserve_log_space: enter"); 2740 if (ticket->t_cnt > 0) 2741 ticket->t_cnt--; 2742 2743 s = GRANT_LOCK(log); 2744 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'w'); 2745 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r'); 2746 ticket->t_curr_res = ticket->t_unit_res; 2747 XLOG_TIC_RESET_RES(ticket); 2748 xlog_trace_loggrant(log, ticket, 2749 "xlog_regrant_reserve_log_space: sub current res"); 2750 xlog_verify_grant_head(log, 1); 2751 2752 /* just return if we still have some of the pre-reserved space */ 2753 if (ticket->t_cnt > 0) { 2754 GRANT_UNLOCK(log, s); 2755 return; 2756 } 2757 2758 XLOG_GRANT_ADD_SPACE(log, ticket->t_unit_res, 'r'); 2759 xlog_trace_loggrant(log, ticket, 2760 "xlog_regrant_reserve_log_space: exit"); 2761 xlog_verify_grant_head(log, 0); 2762 GRANT_UNLOCK(log, s); 2763 ticket->t_curr_res = ticket->t_unit_res; 2764 XLOG_TIC_RESET_RES(ticket); 2765 } /* xlog_regrant_reserve_log_space */ 2766 2767 2768 /* 2769 * Give back the space left from a reservation. 2770 * 2771 * All the information we need to make a correct determination of space left 2772 * is present. For non-permanent reservations, things are quite easy. The 2773 * count should have been decremented to zero. We only need to deal with the 2774 * space remaining in the current reservation part of the ticket. If the 2775 * ticket contains a permanent reservation, there may be left over space which 2776 * needs to be released. A count of N means that N-1 refills of the current 2777 * reservation can be done before we need to ask for more space. The first 2778 * one goes to fill up the first current reservation. Once we run out of 2779 * space, the count will stay at zero and the only space remaining will be 2780 * in the current reservation field. 2781 */ 2782 STATIC void 2783 xlog_ungrant_log_space(xlog_t *log, 2784 xlog_ticket_t *ticket) 2785 { 2786 SPLDECL(s); 2787 2788 if (ticket->t_cnt > 0) 2789 ticket->t_cnt--; 2790 2791 s = GRANT_LOCK(log); 2792 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); 2793 2794 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'w'); 2795 XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r'); 2796 2797 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); 2798 2799 /* If this is a permanent reservation ticket, we may be able to free 2800 * up more space based on the remaining count. 2801 */ 2802 if (ticket->t_cnt > 0) { 2803 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); 2804 XLOG_GRANT_SUB_SPACE(log, ticket->t_unit_res*ticket->t_cnt,'w'); 2805 XLOG_GRANT_SUB_SPACE(log, ticket->t_unit_res*ticket->t_cnt,'r'); 2806 } 2807 2808 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); 2809 xlog_verify_grant_head(log, 1); 2810 GRANT_UNLOCK(log, s); 2811 xfs_log_move_tail(log->l_mp, 1); 2812 } /* xlog_ungrant_log_space */ 2813 2814 2815 /* 2816 * Atomically put back used ticket. 2817 */ 2818 void 2819 xlog_state_put_ticket(xlog_t *log, 2820 xlog_ticket_t *tic) 2821 { 2822 unsigned long s; 2823 2824 s = LOG_LOCK(log); 2825 xlog_ticket_put(log, tic); 2826 LOG_UNLOCK(log, s); 2827 } /* xlog_state_put_ticket */ 2828 2829 /* 2830 * Flush iclog to disk if this is the last reference to the given iclog and 2831 * the WANT_SYNC bit is set. 2832 * 2833 * When this function is entered, the iclog is not necessarily in the 2834 * WANT_SYNC state. It may be sitting around waiting to get filled. 2835 * 2836 * 2837 */ 2838 int 2839 xlog_state_release_iclog(xlog_t *log, 2840 xlog_in_core_t *iclog) 2841 { 2842 SPLDECL(s); 2843 int sync = 0; /* do we sync? */ 2844 2845 xlog_assign_tail_lsn(log->l_mp); 2846 2847 s = LOG_LOCK(log); 2848 2849 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2850 LOG_UNLOCK(log, s); 2851 return XFS_ERROR(EIO); 2852 } 2853 2854 ASSERT(iclog->ic_refcnt > 0); 2855 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || 2856 iclog->ic_state == XLOG_STATE_WANT_SYNC); 2857 2858 if (--iclog->ic_refcnt == 0 && 2859 iclog->ic_state == XLOG_STATE_WANT_SYNC) { 2860 sync++; 2861 iclog->ic_state = XLOG_STATE_SYNCING; 2862 INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn); 2863 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); 2864 /* cycle incremented when incrementing curr_block */ 2865 } 2866 2867 LOG_UNLOCK(log, s); 2868 2869 /* 2870 * We let the log lock go, so it's possible that we hit a log I/O 2871 * error or someother SHUTDOWN condition that marks the iclog 2872 * as XLOG_STATE_IOERROR before the bwrite. However, we know that 2873 * this iclog has consistent data, so we ignore IOERROR 2874 * flags after this point. 2875 */ 2876 if (sync) { 2877 return xlog_sync(log, iclog); 2878 } 2879 return (0); 2880 2881 } /* xlog_state_release_iclog */ 2882 2883 2884 /* 2885 * This routine will mark the current iclog in the ring as WANT_SYNC 2886 * and move the current iclog pointer to the next iclog in the ring. 2887 * When this routine is called from xlog_state_get_iclog_space(), the 2888 * exact size of the iclog has not yet been determined. All we know is 2889 * that every data block. We have run out of space in this log record. 2890 */ 2891 STATIC void 2892 xlog_state_switch_iclogs(xlog_t *log, 2893 xlog_in_core_t *iclog, 2894 int eventual_size) 2895 { 2896 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); 2897 if (!eventual_size) 2898 eventual_size = iclog->ic_offset; 2899 iclog->ic_state = XLOG_STATE_WANT_SYNC; 2900 INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block); 2901 log->l_prev_block = log->l_curr_block; 2902 log->l_prev_cycle = log->l_curr_cycle; 2903 2904 /* roll log?: ic_offset changed later */ 2905 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); 2906 2907 /* Round up to next log-sunit */ 2908 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 2909 log->l_mp->m_sb.sb_logsunit > 1) { 2910 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); 2911 log->l_curr_block = roundup(log->l_curr_block, sunit_bb); 2912 } 2913 2914 if (log->l_curr_block >= log->l_logBBsize) { 2915 log->l_curr_cycle++; 2916 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) 2917 log->l_curr_cycle++; 2918 log->l_curr_block -= log->l_logBBsize; 2919 ASSERT(log->l_curr_block >= 0); 2920 } 2921 ASSERT(iclog == log->l_iclog); 2922 log->l_iclog = iclog->ic_next; 2923 } /* xlog_state_switch_iclogs */ 2924 2925 2926 /* 2927 * Write out all data in the in-core log as of this exact moment in time. 2928 * 2929 * Data may be written to the in-core log during this call. However, 2930 * we don't guarantee this data will be written out. A change from past 2931 * implementation means this routine will *not* write out zero length LRs. 2932 * 2933 * Basically, we try and perform an intelligent scan of the in-core logs. 2934 * If we determine there is no flushable data, we just return. There is no 2935 * flushable data if: 2936 * 2937 * 1. the current iclog is active and has no data; the previous iclog 2938 * is in the active or dirty state. 2939 * 2. the current iclog is drity, and the previous iclog is in the 2940 * active or dirty state. 2941 * 2942 * We may sleep (call psema) if: 2943 * 2944 * 1. the current iclog is not in the active nor dirty state. 2945 * 2. the current iclog dirty, and the previous iclog is not in the 2946 * active nor dirty state. 2947 * 3. the current iclog is active, and there is another thread writing 2948 * to this particular iclog. 2949 * 4. a) the current iclog is active and has no other writers 2950 * b) when we return from flushing out this iclog, it is still 2951 * not in the active nor dirty state. 2952 */ 2953 STATIC int 2954 xlog_state_sync_all(xlog_t *log, uint flags) 2955 { 2956 xlog_in_core_t *iclog; 2957 xfs_lsn_t lsn; 2958 SPLDECL(s); 2959 2960 s = LOG_LOCK(log); 2961 2962 iclog = log->l_iclog; 2963 if (iclog->ic_state & XLOG_STATE_IOERROR) { 2964 LOG_UNLOCK(log, s); 2965 return XFS_ERROR(EIO); 2966 } 2967 2968 /* If the head iclog is not active nor dirty, we just attach 2969 * ourselves to the head and go to sleep. 2970 */ 2971 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2972 iclog->ic_state == XLOG_STATE_DIRTY) { 2973 /* 2974 * If the head is dirty or (active and empty), then 2975 * we need to look at the previous iclog. If the previous 2976 * iclog is active or dirty we are done. There is nothing 2977 * to sync out. Otherwise, we attach ourselves to the 2978 * previous iclog and go to sleep. 2979 */ 2980 if (iclog->ic_state == XLOG_STATE_DIRTY || 2981 (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) { 2982 iclog = iclog->ic_prev; 2983 if (iclog->ic_state == XLOG_STATE_ACTIVE || 2984 iclog->ic_state == XLOG_STATE_DIRTY) 2985 goto no_sleep; 2986 else 2987 goto maybe_sleep; 2988 } else { 2989 if (iclog->ic_refcnt == 0) { 2990 /* We are the only one with access to this 2991 * iclog. Flush it out now. There should 2992 * be a roundoff of zero to show that someone 2993 * has already taken care of the roundoff from 2994 * the previous sync. 2995 */ 2996 iclog->ic_refcnt++; 2997 lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); 2998 xlog_state_switch_iclogs(log, iclog, 0); 2999 LOG_UNLOCK(log, s); 3000 3001 if (xlog_state_release_iclog(log, iclog)) 3002 return XFS_ERROR(EIO); 3003 s = LOG_LOCK(log); 3004 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn && 3005 iclog->ic_state != XLOG_STATE_DIRTY) 3006 goto maybe_sleep; 3007 else 3008 goto no_sleep; 3009 } else { 3010 /* Someone else is writing to this iclog. 3011 * Use its call to flush out the data. However, 3012 * the other thread may not force out this LR, 3013 * so we mark it WANT_SYNC. 3014 */ 3015 xlog_state_switch_iclogs(log, iclog, 0); 3016 goto maybe_sleep; 3017 } 3018 } 3019 } 3020 3021 /* By the time we come around again, the iclog could've been filled 3022 * which would give it another lsn. If we have a new lsn, just 3023 * return because the relevant data has been flushed. 3024 */ 3025 maybe_sleep: 3026 if (flags & XFS_LOG_SYNC) { 3027 /* 3028 * We must check if we're shutting down here, before 3029 * we wait, while we're holding the LOG_LOCK. 3030 * Then we check again after waking up, in case our 3031 * sleep was disturbed by a bad news. 3032 */ 3033 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3034 LOG_UNLOCK(log, s); 3035 return XFS_ERROR(EIO); 3036 } 3037 XFS_STATS_INC(xs_log_force_sleep); 3038 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s); 3039 /* 3040 * No need to grab the log lock here since we're 3041 * only deciding whether or not to return EIO 3042 * and the memory read should be atomic. 3043 */ 3044 if (iclog->ic_state & XLOG_STATE_IOERROR) 3045 return XFS_ERROR(EIO); 3046 3047 } else { 3048 3049 no_sleep: 3050 LOG_UNLOCK(log, s); 3051 } 3052 return 0; 3053 } /* xlog_state_sync_all */ 3054 3055 3056 /* 3057 * Used by code which implements synchronous log forces. 3058 * 3059 * Find in-core log with lsn. 3060 * If it is in the DIRTY state, just return. 3061 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC 3062 * state and go to sleep or return. 3063 * If it is in any other state, go to sleep or return. 3064 * 3065 * If filesystem activity goes to zero, the iclog will get flushed only by 3066 * bdflush(). 3067 */ 3068 int 3069 xlog_state_sync(xlog_t *log, 3070 xfs_lsn_t lsn, 3071 uint flags) 3072 { 3073 xlog_in_core_t *iclog; 3074 int already_slept = 0; 3075 SPLDECL(s); 3076 3077 3078 try_again: 3079 s = LOG_LOCK(log); 3080 iclog = log->l_iclog; 3081 3082 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3083 LOG_UNLOCK(log, s); 3084 return XFS_ERROR(EIO); 3085 } 3086 3087 do { 3088 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) { 3089 iclog = iclog->ic_next; 3090 continue; 3091 } 3092 3093 if (iclog->ic_state == XLOG_STATE_DIRTY) { 3094 LOG_UNLOCK(log, s); 3095 return 0; 3096 } 3097 3098 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3099 /* 3100 * We sleep here if we haven't already slept (e.g. 3101 * this is the first time we've looked at the correct 3102 * iclog buf) and the buffer before us is going to 3103 * be sync'ed. The reason for this is that if we 3104 * are doing sync transactions here, by waiting for 3105 * the previous I/O to complete, we can allow a few 3106 * more transactions into this iclog before we close 3107 * it down. 3108 * 3109 * Otherwise, we mark the buffer WANT_SYNC, and bump 3110 * up the refcnt so we can release the log (which drops 3111 * the ref count). The state switch keeps new transaction 3112 * commits from using this buffer. When the current commits 3113 * finish writing into the buffer, the refcount will drop to 3114 * zero and the buffer will go out then. 3115 */ 3116 if (!already_slept && 3117 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | 3118 XLOG_STATE_SYNCING))) { 3119 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); 3120 XFS_STATS_INC(xs_log_force_sleep); 3121 sv_wait(&iclog->ic_prev->ic_writesema, PSWP, 3122 &log->l_icloglock, s); 3123 already_slept = 1; 3124 goto try_again; 3125 } else { 3126 iclog->ic_refcnt++; 3127 xlog_state_switch_iclogs(log, iclog, 0); 3128 LOG_UNLOCK(log, s); 3129 if (xlog_state_release_iclog(log, iclog)) 3130 return XFS_ERROR(EIO); 3131 s = LOG_LOCK(log); 3132 } 3133 } 3134 3135 if ((flags & XFS_LOG_SYNC) && /* sleep */ 3136 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { 3137 3138 /* 3139 * Don't wait on the forcesema if we know that we've 3140 * gotten a log write error. 3141 */ 3142 if (iclog->ic_state & XLOG_STATE_IOERROR) { 3143 LOG_UNLOCK(log, s); 3144 return XFS_ERROR(EIO); 3145 } 3146 XFS_STATS_INC(xs_log_force_sleep); 3147 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s); 3148 /* 3149 * No need to grab the log lock here since we're 3150 * only deciding whether or not to return EIO 3151 * and the memory read should be atomic. 3152 */ 3153 if (iclog->ic_state & XLOG_STATE_IOERROR) 3154 return XFS_ERROR(EIO); 3155 } else { /* just return */ 3156 LOG_UNLOCK(log, s); 3157 } 3158 return 0; 3159 3160 } while (iclog != log->l_iclog); 3161 3162 LOG_UNLOCK(log, s); 3163 return (0); 3164 } /* xlog_state_sync */ 3165 3166 3167 /* 3168 * Called when we want to mark the current iclog as being ready to sync to 3169 * disk. 3170 */ 3171 void 3172 xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) 3173 { 3174 SPLDECL(s); 3175 3176 s = LOG_LOCK(log); 3177 3178 if (iclog->ic_state == XLOG_STATE_ACTIVE) { 3179 xlog_state_switch_iclogs(log, iclog, 0); 3180 } else { 3181 ASSERT(iclog->ic_state & 3182 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); 3183 } 3184 3185 LOG_UNLOCK(log, s); 3186 } /* xlog_state_want_sync */ 3187 3188 3189 3190 /***************************************************************************** 3191 * 3192 * TICKET functions 3193 * 3194 ***************************************************************************** 3195 */ 3196 3197 /* 3198 * Algorithm doesn't take into account page size. ;-( 3199 */ 3200 STATIC void 3201 xlog_state_ticket_alloc(xlog_t *log) 3202 { 3203 xlog_ticket_t *t_list; 3204 xlog_ticket_t *next; 3205 xfs_caddr_t buf; 3206 uint i = (NBPP / sizeof(xlog_ticket_t)) - 2; 3207 SPLDECL(s); 3208 3209 /* 3210 * The kmem_zalloc may sleep, so we shouldn't be holding the 3211 * global lock. XXXmiken: may want to use zone allocator. 3212 */ 3213 buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP); 3214 3215 s = LOG_LOCK(log); 3216 3217 /* Attach 1st ticket to Q, so we can keep track of allocated memory */ 3218 t_list = (xlog_ticket_t *)buf; 3219 t_list->t_next = log->l_unmount_free; 3220 log->l_unmount_free = t_list++; 3221 log->l_ticket_cnt++; 3222 log->l_ticket_tcnt++; 3223 3224 /* Next ticket becomes first ticket attached to ticket free list */ 3225 if (log->l_freelist != NULL) { 3226 ASSERT(log->l_tail != NULL); 3227 log->l_tail->t_next = t_list; 3228 } else { 3229 log->l_freelist = t_list; 3230 } 3231 log->l_ticket_cnt++; 3232 log->l_ticket_tcnt++; 3233 3234 /* Cycle through rest of alloc'ed memory, building up free Q */ 3235 for ( ; i > 0; i--) { 3236 next = t_list + 1; 3237 t_list->t_next = next; 3238 t_list = next; 3239 log->l_ticket_cnt++; 3240 log->l_ticket_tcnt++; 3241 } 3242 t_list->t_next = NULL; 3243 log->l_tail = t_list; 3244 LOG_UNLOCK(log, s); 3245 } /* xlog_state_ticket_alloc */ 3246 3247 3248 /* 3249 * Put ticket into free list 3250 * 3251 * Assumption: log lock is held around this call. 3252 */ 3253 STATIC void 3254 xlog_ticket_put(xlog_t *log, 3255 xlog_ticket_t *ticket) 3256 { 3257 sv_destroy(&ticket->t_sema); 3258 3259 /* 3260 * Don't think caching will make that much difference. It's 3261 * more important to make debug easier. 3262 */ 3263 #if 0 3264 /* real code will want to use LIFO for caching */ 3265 ticket->t_next = log->l_freelist; 3266 log->l_freelist = ticket; 3267 /* no need to clear fields */ 3268 #else 3269 /* When we debug, it is easier if tickets are cycled */ 3270 ticket->t_next = NULL; 3271 if (log->l_tail != 0) { 3272 log->l_tail->t_next = ticket; 3273 } else { 3274 ASSERT(log->l_freelist == 0); 3275 log->l_freelist = ticket; 3276 } 3277 log->l_tail = ticket; 3278 #endif /* DEBUG */ 3279 log->l_ticket_cnt++; 3280 } /* xlog_ticket_put */ 3281 3282 3283 /* 3284 * Grab ticket off freelist or allocation some more 3285 */ 3286 xlog_ticket_t * 3287 xlog_ticket_get(xlog_t *log, 3288 int unit_bytes, 3289 int cnt, 3290 char client, 3291 uint xflags) 3292 { 3293 xlog_ticket_t *tic; 3294 uint num_headers; 3295 SPLDECL(s); 3296 3297 alloc: 3298 if (log->l_freelist == NULL) 3299 xlog_state_ticket_alloc(log); /* potentially sleep */ 3300 3301 s = LOG_LOCK(log); 3302 if (log->l_freelist == NULL) { 3303 LOG_UNLOCK(log, s); 3304 goto alloc; 3305 } 3306 tic = log->l_freelist; 3307 log->l_freelist = tic->t_next; 3308 if (log->l_freelist == NULL) 3309 log->l_tail = NULL; 3310 log->l_ticket_cnt--; 3311 LOG_UNLOCK(log, s); 3312 3313 /* 3314 * Permanent reservations have up to 'cnt'-1 active log operations 3315 * in the log. A unit in this case is the amount of space for one 3316 * of these log operations. Normal reservations have a cnt of 1 3317 * and their unit amount is the total amount of space required. 3318 * 3319 * The following lines of code account for non-transaction data 3320 * which occupy space in the on-disk log. 3321 * 3322 * Normal form of a transaction is: 3323 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> 3324 * and then there are LR hdrs, split-recs and roundoff at end of syncs. 3325 * 3326 * We need to account for all the leadup data and trailer data 3327 * around the transaction data. 3328 * And then we need to account for the worst case in terms of using 3329 * more space. 3330 * The worst case will happen if: 3331 * - the placement of the transaction happens to be such that the 3332 * roundoff is at its maximum 3333 * - the transaction data is synced before the commit record is synced 3334 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> 3335 * Therefore the commit record is in its own Log Record. 3336 * This can happen as the commit record is called with its 3337 * own region to xlog_write(). 3338 * This then means that in the worst case, roundoff can happen for 3339 * the commit-rec as well. 3340 * The commit-rec is smaller than padding in this scenario and so it is 3341 * not added separately. 3342 */ 3343 3344 /* for trans header */ 3345 unit_bytes += sizeof(xlog_op_header_t); 3346 unit_bytes += sizeof(xfs_trans_header_t); 3347 3348 /* for start-rec */ 3349 unit_bytes += sizeof(xlog_op_header_t); 3350 3351 /* for LR headers */ 3352 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); 3353 unit_bytes += log->l_iclog_hsize * num_headers; 3354 3355 /* for commit-rec LR header - note: padding will subsume the ophdr */ 3356 unit_bytes += log->l_iclog_hsize; 3357 3358 /* for split-recs - ophdrs added when data split over LRs */ 3359 unit_bytes += sizeof(xlog_op_header_t) * num_headers; 3360 3361 /* for roundoff padding for transaction data and one for commit record */ 3362 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && 3363 log->l_mp->m_sb.sb_logsunit > 1) { 3364 /* log su roundoff */ 3365 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; 3366 } else { 3367 /* BB roundoff */ 3368 unit_bytes += 2*BBSIZE; 3369 } 3370 3371 tic->t_unit_res = unit_bytes; 3372 tic->t_curr_res = unit_bytes; 3373 tic->t_cnt = cnt; 3374 tic->t_ocnt = cnt; 3375 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); 3376 tic->t_clientid = client; 3377 tic->t_flags = XLOG_TIC_INITED; 3378 tic->t_trans_type = 0; 3379 if (xflags & XFS_LOG_PERM_RESERV) 3380 tic->t_flags |= XLOG_TIC_PERM_RESERV; 3381 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick"); 3382 3383 XLOG_TIC_RESET_RES(tic); 3384 3385 return tic; 3386 } /* xlog_ticket_get */ 3387 3388 3389 /****************************************************************************** 3390 * 3391 * Log debug routines 3392 * 3393 ****************************************************************************** 3394 */ 3395 #if defined(DEBUG) && !defined(XLOG_NOLOG) 3396 /* 3397 * Make sure that the destination ptr is within the valid data region of 3398 * one of the iclogs. This uses backup pointers stored in a different 3399 * part of the log in case we trash the log structure. 3400 */ 3401 void 3402 xlog_verify_dest_ptr(xlog_t *log, 3403 __psint_t ptr) 3404 { 3405 int i; 3406 int good_ptr = 0; 3407 3408 for (i=0; i < log->l_iclog_bufs; i++) { 3409 if (ptr >= (__psint_t)log->l_iclog_bak[i] && 3410 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) 3411 good_ptr++; 3412 } 3413 if (! good_ptr) 3414 xlog_panic("xlog_verify_dest_ptr: invalid ptr"); 3415 } /* xlog_verify_dest_ptr */ 3416 3417 STATIC void 3418 xlog_verify_grant_head(xlog_t *log, int equals) 3419 { 3420 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { 3421 if (equals) 3422 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); 3423 else 3424 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); 3425 } else { 3426 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); 3427 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); 3428 } 3429 } /* xlog_verify_grant_head */ 3430 3431 /* check if it will fit */ 3432 STATIC void 3433 xlog_verify_tail_lsn(xlog_t *log, 3434 xlog_in_core_t *iclog, 3435 xfs_lsn_t tail_lsn) 3436 { 3437 int blocks; 3438 3439 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { 3440 blocks = 3441 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); 3442 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) 3443 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3444 } else { 3445 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); 3446 3447 if (BLOCK_LSN(tail_lsn) == log->l_prev_block) 3448 xlog_panic("xlog_verify_tail_lsn: tail wrapped"); 3449 3450 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; 3451 if (blocks < BTOBB(iclog->ic_offset) + 1) 3452 xlog_panic("xlog_verify_tail_lsn: ran out of log space"); 3453 } 3454 } /* xlog_verify_tail_lsn */ 3455 3456 /* 3457 * Perform a number of checks on the iclog before writing to disk. 3458 * 3459 * 1. Make sure the iclogs are still circular 3460 * 2. Make sure we have a good magic number 3461 * 3. Make sure we don't have magic numbers in the data 3462 * 4. Check fields of each log operation header for: 3463 * A. Valid client identifier 3464 * B. tid ptr value falls in valid ptr space (user space code) 3465 * C. Length in log record header is correct according to the 3466 * individual operation headers within record. 3467 * 5. When a bwrite will occur within 5 blocks of the front of the physical 3468 * log, check the preceding blocks of the physical log to make sure all 3469 * the cycle numbers agree with the current cycle number. 3470 */ 3471 STATIC void 3472 xlog_verify_iclog(xlog_t *log, 3473 xlog_in_core_t *iclog, 3474 int count, 3475 boolean_t syncing) 3476 { 3477 xlog_op_header_t *ophead; 3478 xlog_in_core_t *icptr; 3479 xlog_in_core_2_t *xhdr; 3480 xfs_caddr_t ptr; 3481 xfs_caddr_t base_ptr; 3482 __psint_t field_offset; 3483 __uint8_t clientid; 3484 int len, i, j, k, op_len; 3485 int idx; 3486 SPLDECL(s); 3487 3488 /* check validity of iclog pointers */ 3489 s = LOG_LOCK(log); 3490 icptr = log->l_iclog; 3491 for (i=0; i < log->l_iclog_bufs; i++) { 3492 if (icptr == 0) 3493 xlog_panic("xlog_verify_iclog: invalid ptr"); 3494 icptr = icptr->ic_next; 3495 } 3496 if (icptr != log->l_iclog) 3497 xlog_panic("xlog_verify_iclog: corrupt iclog ring"); 3498 LOG_UNLOCK(log, s); 3499 3500 /* check log magic numbers */ 3501 ptr = (xfs_caddr_t) &(iclog->ic_header); 3502 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM) 3503 xlog_panic("xlog_verify_iclog: invalid magic num"); 3504 3505 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count; 3506 ptr += BBSIZE) { 3507 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) 3508 xlog_panic("xlog_verify_iclog: unexpected magic num"); 3509 } 3510 3511 /* check fields */ 3512 len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT); 3513 ptr = iclog->ic_datap; 3514 base_ptr = ptr; 3515 ophead = (xlog_op_header_t *)ptr; 3516 xhdr = (xlog_in_core_2_t *)&iclog->ic_header; 3517 for (i = 0; i < len; i++) { 3518 ophead = (xlog_op_header_t *)ptr; 3519 3520 /* clientid is only 1 byte */ 3521 field_offset = (__psint_t) 3522 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); 3523 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3524 clientid = ophead->oh_clientid; 3525 } else { 3526 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); 3527 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3528 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3529 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3530 clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3531 } else { 3532 clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3533 } 3534 } 3535 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) 3536 cmn_err(CE_WARN, "xlog_verify_iclog: invalid clientid %d op 0x%p offset 0x%x", clientid, ophead, field_offset); 3537 3538 /* check length */ 3539 field_offset = (__psint_t) 3540 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); 3541 if (syncing == B_FALSE || (field_offset & 0x1ff)) { 3542 op_len = INT_GET(ophead->oh_len, ARCH_CONVERT); 3543 } else { 3544 idx = BTOBBT((__psint_t)&ophead->oh_len - 3545 (__psint_t)iclog->ic_datap); 3546 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { 3547 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3548 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); 3549 op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); 3550 } else { 3551 op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); 3552 } 3553 } 3554 ptr += sizeof(xlog_op_header_t) + op_len; 3555 } 3556 } /* xlog_verify_iclog */ 3557 #endif /* DEBUG && !XLOG_NOLOG */ 3558 3559 /* 3560 * Mark all iclogs IOERROR. LOG_LOCK is held by the caller. 3561 */ 3562 STATIC int 3563 xlog_state_ioerror( 3564 xlog_t *log) 3565 { 3566 xlog_in_core_t *iclog, *ic; 3567 3568 iclog = log->l_iclog; 3569 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { 3570 /* 3571 * Mark all the incore logs IOERROR. 3572 * From now on, no log flushes will result. 3573 */ 3574 ic = iclog; 3575 do { 3576 ic->ic_state = XLOG_STATE_IOERROR; 3577 ic = ic->ic_next; 3578 } while (ic != iclog); 3579 return (0); 3580 } 3581 /* 3582 * Return non-zero, if state transition has already happened. 3583 */ 3584 return (1); 3585 } 3586 3587 /* 3588 * This is called from xfs_force_shutdown, when we're forcibly 3589 * shutting down the filesystem, typically because of an IO error. 3590 * Our main objectives here are to make sure that: 3591 * a. the filesystem gets marked 'SHUTDOWN' for all interested 3592 * parties to find out, 'atomically'. 3593 * b. those who're sleeping on log reservations, pinned objects and 3594 * other resources get woken up, and be told the bad news. 3595 * c. nothing new gets queued up after (a) and (b) are done. 3596 * d. if !logerror, flush the iclogs to disk, then seal them off 3597 * for business. 3598 */ 3599 int 3600 xfs_log_force_umount( 3601 struct xfs_mount *mp, 3602 int logerror) 3603 { 3604 xlog_ticket_t *tic; 3605 xlog_t *log; 3606 int retval; 3607 SPLDECL(s); 3608 SPLDECL(s2); 3609 3610 log = mp->m_log; 3611 3612 /* 3613 * If this happens during log recovery, don't worry about 3614 * locking; the log isn't open for business yet. 3615 */ 3616 if (!log || 3617 log->l_flags & XLOG_ACTIVE_RECOVERY) { 3618 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3619 XFS_BUF_DONE(mp->m_sb_bp); 3620 return (0); 3621 } 3622 3623 /* 3624 * Somebody could've already done the hard work for us. 3625 * No need to get locks for this. 3626 */ 3627 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { 3628 ASSERT(XLOG_FORCED_SHUTDOWN(log)); 3629 return (1); 3630 } 3631 retval = 0; 3632 /* 3633 * We must hold both the GRANT lock and the LOG lock, 3634 * before we mark the filesystem SHUTDOWN and wake 3635 * everybody up to tell the bad news. 3636 */ 3637 s = GRANT_LOCK(log); 3638 s2 = LOG_LOCK(log); 3639 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; 3640 XFS_BUF_DONE(mp->m_sb_bp); 3641 /* 3642 * This flag is sort of redundant because of the mount flag, but 3643 * it's good to maintain the separation between the log and the rest 3644 * of XFS. 3645 */ 3646 log->l_flags |= XLOG_IO_ERROR; 3647 3648 /* 3649 * If we hit a log error, we want to mark all the iclogs IOERROR 3650 * while we're still holding the loglock. 3651 */ 3652 if (logerror) 3653 retval = xlog_state_ioerror(log); 3654 LOG_UNLOCK(log, s2); 3655 3656 /* 3657 * We don't want anybody waiting for log reservations 3658 * after this. That means we have to wake up everybody 3659 * queued up on reserve_headq as well as write_headq. 3660 * In addition, we make sure in xlog_{re}grant_log_space 3661 * that we don't enqueue anything once the SHUTDOWN flag 3662 * is set, and this action is protected by the GRANTLOCK. 3663 */ 3664 if ((tic = log->l_reserve_headq)) { 3665 do { 3666 sv_signal(&tic->t_sema); 3667 tic = tic->t_next; 3668 } while (tic != log->l_reserve_headq); 3669 } 3670 3671 if ((tic = log->l_write_headq)) { 3672 do { 3673 sv_signal(&tic->t_sema); 3674 tic = tic->t_next; 3675 } while (tic != log->l_write_headq); 3676 } 3677 GRANT_UNLOCK(log, s); 3678 3679 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { 3680 ASSERT(!logerror); 3681 /* 3682 * Force the incore logs to disk before shutting the 3683 * log down completely. 3684 */ 3685 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC); 3686 s2 = LOG_LOCK(log); 3687 retval = xlog_state_ioerror(log); 3688 LOG_UNLOCK(log, s2); 3689 } 3690 /* 3691 * Wake up everybody waiting on xfs_log_force. 3692 * Callback all log item committed functions as if the 3693 * log writes were completed. 3694 */ 3695 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); 3696 3697 #ifdef XFSERRORDEBUG 3698 { 3699 xlog_in_core_t *iclog; 3700 3701 s = LOG_LOCK(log); 3702 iclog = log->l_iclog; 3703 do { 3704 ASSERT(iclog->ic_callback == 0); 3705 iclog = iclog->ic_next; 3706 } while (iclog != log->l_iclog); 3707 LOG_UNLOCK(log, s); 3708 } 3709 #endif 3710 /* return non-zero if log IOERROR transition had already happened */ 3711 return (retval); 3712 } 3713 3714 STATIC int 3715 xlog_iclogs_empty(xlog_t *log) 3716 { 3717 xlog_in_core_t *iclog; 3718 3719 iclog = log->l_iclog; 3720 do { 3721 /* endianness does not matter here, zero is zero in 3722 * any language. 3723 */ 3724 if (iclog->ic_header.h_num_logops) 3725 return(0); 3726 iclog = iclog->ic_next; 3727 } while (iclog != log->l_iclog); 3728 return(1); 3729 } 3730