1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/sched.h> 11 #include <linux/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/gfs2_ondisk.h> 16 #include <linux/crc32.h> 17 #include <linux/lm_interface.h> 18 #include <linux/delay.h> 19 20 #include "gfs2.h" 21 #include "incore.h" 22 #include "bmap.h" 23 #include "glock.h" 24 #include "log.h" 25 #include "lops.h" 26 #include "meta_io.h" 27 #include "util.h" 28 #include "dir.h" 29 30 #define PULL 1 31 32 /** 33 * gfs2_struct2blk - compute stuff 34 * @sdp: the filesystem 35 * @nstruct: the number of structures 36 * @ssize: the size of the structures 37 * 38 * Compute the number of log descriptor blocks needed to hold a certain number 39 * of structures of a certain size. 40 * 41 * Returns: the number of blocks needed (minimum is always 1) 42 */ 43 44 unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct, 45 unsigned int ssize) 46 { 47 unsigned int blks; 48 unsigned int first, second; 49 50 blks = 1; 51 first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize; 52 53 if (nstruct > first) { 54 second = (sdp->sd_sb.sb_bsize - 55 sizeof(struct gfs2_meta_header)) / ssize; 56 blks += DIV_ROUND_UP(nstruct - first, second); 57 } 58 59 return blks; 60 } 61 62 /** 63 * gfs2_ail1_start_one - Start I/O on a part of the AIL 64 * @sdp: the filesystem 65 * @tr: the part of the AIL 66 * 67 */ 68 69 static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) 70 { 71 struct gfs2_bufdata *bd, *s; 72 struct buffer_head *bh; 73 int retry; 74 75 BUG_ON(!spin_is_locked(&sdp->sd_log_lock)); 76 77 do { 78 retry = 0; 79 80 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, 81 bd_ail_st_list) { 82 bh = bd->bd_bh; 83 84 gfs2_assert(sdp, bd->bd_ail == ai); 85 86 if (!buffer_busy(bh)) { 87 if (!buffer_uptodate(bh)) { 88 gfs2_log_unlock(sdp); 89 gfs2_io_error_bh(sdp, bh); 90 gfs2_log_lock(sdp); 91 } 92 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); 93 continue; 94 } 95 96 if (!buffer_dirty(bh)) 97 continue; 98 99 list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); 100 101 gfs2_log_unlock(sdp); 102 wait_on_buffer(bh); 103 ll_rw_block(WRITE, 1, &bh); 104 gfs2_log_lock(sdp); 105 106 retry = 1; 107 break; 108 } 109 } while (retry); 110 } 111 112 /** 113 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced 114 * @sdp: the filesystem 115 * @ai: the AIL entry 116 * 117 */ 118 119 static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) 120 { 121 struct gfs2_bufdata *bd, *s; 122 struct buffer_head *bh; 123 124 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, 125 bd_ail_st_list) { 126 bh = bd->bd_bh; 127 128 gfs2_assert(sdp, bd->bd_ail == ai); 129 130 if (buffer_busy(bh)) { 131 if (flags & DIO_ALL) 132 continue; 133 else 134 break; 135 } 136 137 if (!buffer_uptodate(bh)) 138 gfs2_io_error_bh(sdp, bh); 139 140 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); 141 } 142 143 return list_empty(&ai->ai_ail1_list); 144 } 145 146 static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) 147 { 148 struct list_head *head = &sdp->sd_ail1_list; 149 u64 sync_gen; 150 struct list_head *first; 151 struct gfs2_ail *first_ai, *ai, *tmp; 152 int done = 0; 153 154 gfs2_log_lock(sdp); 155 if (list_empty(head)) { 156 gfs2_log_unlock(sdp); 157 return; 158 } 159 sync_gen = sdp->sd_ail_sync_gen++; 160 161 first = head->prev; 162 first_ai = list_entry(first, struct gfs2_ail, ai_list); 163 first_ai->ai_sync_gen = sync_gen; 164 gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */ 165 166 if (flags & DIO_ALL) 167 first = NULL; 168 169 while(!done) { 170 if (first && (head->prev != first || 171 gfs2_ail1_empty_one(sdp, first_ai, 0))) 172 break; 173 174 done = 1; 175 list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) { 176 if (ai->ai_sync_gen >= sync_gen) 177 continue; 178 ai->ai_sync_gen = sync_gen; 179 gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */ 180 done = 0; 181 break; 182 } 183 } 184 185 gfs2_log_unlock(sdp); 186 } 187 188 int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) 189 { 190 struct gfs2_ail *ai, *s; 191 int ret; 192 193 gfs2_log_lock(sdp); 194 195 list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { 196 if (gfs2_ail1_empty_one(sdp, ai, flags)) 197 list_move(&ai->ai_list, &sdp->sd_ail2_list); 198 else if (!(flags & DIO_ALL)) 199 break; 200 } 201 202 ret = list_empty(&sdp->sd_ail1_list); 203 204 gfs2_log_unlock(sdp); 205 206 return ret; 207 } 208 209 210 /** 211 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced 212 * @sdp: the filesystem 213 * @ai: the AIL entry 214 * 215 */ 216 217 static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) 218 { 219 struct list_head *head = &ai->ai_ail2_list; 220 struct gfs2_bufdata *bd; 221 222 while (!list_empty(head)) { 223 bd = list_entry(head->prev, struct gfs2_bufdata, 224 bd_ail_st_list); 225 gfs2_assert(sdp, bd->bd_ail == ai); 226 bd->bd_ail = NULL; 227 list_del(&bd->bd_ail_st_list); 228 list_del(&bd->bd_ail_gl_list); 229 atomic_dec(&bd->bd_gl->gl_ail_count); 230 brelse(bd->bd_bh); 231 } 232 } 233 234 static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) 235 { 236 struct gfs2_ail *ai, *safe; 237 unsigned int old_tail = sdp->sd_log_tail; 238 int wrap = (new_tail < old_tail); 239 int a, b, rm; 240 241 gfs2_log_lock(sdp); 242 243 list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { 244 a = (old_tail <= ai->ai_first); 245 b = (ai->ai_first < new_tail); 246 rm = (wrap) ? (a || b) : (a && b); 247 if (!rm) 248 continue; 249 250 gfs2_ail2_empty_one(sdp, ai); 251 list_del(&ai->ai_list); 252 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); 253 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); 254 kfree(ai); 255 } 256 257 gfs2_log_unlock(sdp); 258 } 259 260 /** 261 * gfs2_log_reserve - Make a log reservation 262 * @sdp: The GFS2 superblock 263 * @blks: The number of blocks to reserve 264 * 265 * Note that we never give out the last 6 blocks of the journal. Thats 266 * due to the fact that there is are a small number of header blocks 267 * associated with each log flush. The exact number can't be known until 268 * flush time, so we ensure that we have just enough free blocks at all 269 * times to avoid running out during a log flush. 270 * 271 * Returns: errno 272 */ 273 274 int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) 275 { 276 unsigned int try = 0; 277 278 if (gfs2_assert_warn(sdp, blks) || 279 gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) 280 return -EINVAL; 281 282 mutex_lock(&sdp->sd_log_reserve_mutex); 283 gfs2_log_lock(sdp); 284 while(sdp->sd_log_blks_free <= (blks + 6)) { 285 gfs2_log_unlock(sdp); 286 gfs2_ail1_empty(sdp, 0); 287 gfs2_log_flush(sdp, NULL); 288 289 if (try++) 290 gfs2_ail1_start(sdp, 0); 291 gfs2_log_lock(sdp); 292 } 293 sdp->sd_log_blks_free -= blks; 294 gfs2_log_unlock(sdp); 295 mutex_unlock(&sdp->sd_log_reserve_mutex); 296 297 down_read(&sdp->sd_log_flush_lock); 298 299 return 0; 300 } 301 302 /** 303 * gfs2_log_release - Release a given number of log blocks 304 * @sdp: The GFS2 superblock 305 * @blks: The number of blocks 306 * 307 */ 308 309 void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) 310 { 311 312 gfs2_log_lock(sdp); 313 sdp->sd_log_blks_free += blks; 314 gfs2_assert_withdraw(sdp, 315 sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); 316 gfs2_log_unlock(sdp); 317 up_read(&sdp->sd_log_flush_lock); 318 } 319 320 static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) 321 { 322 struct inode *inode = sdp->sd_jdesc->jd_inode; 323 int error; 324 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 325 326 bh_map.b_size = 1 << inode->i_blkbits; 327 error = gfs2_block_map(inode, lbn, 0, &bh_map); 328 if (error || !bh_map.b_blocknr) 329 printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, 330 (unsigned long long)bh_map.b_blocknr, lbn); 331 gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr); 332 333 return bh_map.b_blocknr; 334 } 335 336 /** 337 * log_distance - Compute distance between two journal blocks 338 * @sdp: The GFS2 superblock 339 * @newer: The most recent journal block of the pair 340 * @older: The older journal block of the pair 341 * 342 * Compute the distance (in the journal direction) between two 343 * blocks in the journal 344 * 345 * Returns: the distance in blocks 346 */ 347 348 static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer, 349 unsigned int older) 350 { 351 int dist; 352 353 dist = newer - older; 354 if (dist < 0) 355 dist += sdp->sd_jdesc->jd_blocks; 356 357 return dist; 358 } 359 360 static unsigned int current_tail(struct gfs2_sbd *sdp) 361 { 362 struct gfs2_ail *ai; 363 unsigned int tail; 364 365 gfs2_log_lock(sdp); 366 367 if (list_empty(&sdp->sd_ail1_list)) { 368 tail = sdp->sd_log_head; 369 } else { 370 ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list); 371 tail = ai->ai_first; 372 } 373 374 gfs2_log_unlock(sdp); 375 376 return tail; 377 } 378 379 static inline void log_incr_head(struct gfs2_sbd *sdp) 380 { 381 if (sdp->sd_log_flush_head == sdp->sd_log_tail) 382 gfs2_assert_withdraw(sdp, sdp->sd_log_flush_head == sdp->sd_log_head); 383 384 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { 385 sdp->sd_log_flush_head = 0; 386 sdp->sd_log_flush_wrapped = 1; 387 } 388 } 389 390 /** 391 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data 392 * @sdp: The GFS2 superblock 393 * 394 * Returns: the buffer_head 395 */ 396 397 struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) 398 { 399 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); 400 struct gfs2_log_buf *lb; 401 struct buffer_head *bh; 402 403 lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); 404 list_add(&lb->lb_list, &sdp->sd_log_flush_list); 405 406 bh = lb->lb_bh = sb_getblk(sdp->sd_vfs, blkno); 407 lock_buffer(bh); 408 memset(bh->b_data, 0, bh->b_size); 409 set_buffer_uptodate(bh); 410 clear_buffer_dirty(bh); 411 unlock_buffer(bh); 412 413 log_incr_head(sdp); 414 415 return bh; 416 } 417 418 /** 419 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log 420 * @sdp: the filesystem 421 * @data: the data the buffer_head should point to 422 * 423 * Returns: the log buffer descriptor 424 */ 425 426 struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, 427 struct buffer_head *real) 428 { 429 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); 430 struct gfs2_log_buf *lb; 431 struct buffer_head *bh; 432 433 lb = kzalloc(sizeof(struct gfs2_log_buf), GFP_NOFS | __GFP_NOFAIL); 434 list_add(&lb->lb_list, &sdp->sd_log_flush_list); 435 lb->lb_real = real; 436 437 bh = lb->lb_bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); 438 atomic_set(&bh->b_count, 1); 439 bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate); 440 set_bh_page(bh, real->b_page, bh_offset(real)); 441 bh->b_blocknr = blkno; 442 bh->b_size = sdp->sd_sb.sb_bsize; 443 bh->b_bdev = sdp->sd_vfs->s_bdev; 444 445 log_incr_head(sdp); 446 447 return bh; 448 } 449 450 static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail, int pull) 451 { 452 unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); 453 454 ail2_empty(sdp, new_tail); 455 456 gfs2_log_lock(sdp); 457 sdp->sd_log_blks_free += dist - (pull ? 1 : 0); 458 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); 459 gfs2_log_unlock(sdp); 460 461 sdp->sd_log_tail = new_tail; 462 } 463 464 /** 465 * log_write_header - Get and initialize a journal header buffer 466 * @sdp: The GFS2 superblock 467 * 468 * Returns: the initialized log buffer descriptor 469 */ 470 471 static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull) 472 { 473 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); 474 struct buffer_head *bh; 475 struct gfs2_log_header *lh; 476 unsigned int tail; 477 u32 hash; 478 479 bh = sb_getblk(sdp->sd_vfs, blkno); 480 lock_buffer(bh); 481 memset(bh->b_data, 0, bh->b_size); 482 set_buffer_uptodate(bh); 483 clear_buffer_dirty(bh); 484 unlock_buffer(bh); 485 486 gfs2_ail1_empty(sdp, 0); 487 tail = current_tail(sdp); 488 489 lh = (struct gfs2_log_header *)bh->b_data; 490 memset(lh, 0, sizeof(struct gfs2_log_header)); 491 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 492 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); 493 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); 494 lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++); 495 lh->lh_flags = cpu_to_be32(flags); 496 lh->lh_tail = cpu_to_be32(tail); 497 lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head); 498 hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); 499 lh->lh_hash = cpu_to_be32(hash); 500 501 set_buffer_dirty(bh); 502 if (sync_dirty_buffer(bh)) 503 gfs2_io_error_bh(sdp, bh); 504 brelse(bh); 505 506 if (sdp->sd_log_tail != tail) 507 log_pull_tail(sdp, tail, pull); 508 else 509 gfs2_assert_withdraw(sdp, !pull); 510 511 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); 512 log_incr_head(sdp); 513 } 514 515 static void log_flush_commit(struct gfs2_sbd *sdp) 516 { 517 struct list_head *head = &sdp->sd_log_flush_list; 518 struct gfs2_log_buf *lb; 519 struct buffer_head *bh; 520 521 while (!list_empty(head)) { 522 lb = list_entry(head->next, struct gfs2_log_buf, lb_list); 523 list_del(&lb->lb_list); 524 bh = lb->lb_bh; 525 526 wait_on_buffer(bh); 527 if (!buffer_uptodate(bh)) 528 gfs2_io_error_bh(sdp, bh); 529 if (lb->lb_real) { 530 while (atomic_read(&bh->b_count) != 1) /* Grrrr... */ 531 schedule(); 532 free_buffer_head(bh); 533 } else 534 brelse(bh); 535 kfree(lb); 536 } 537 538 log_write_header(sdp, 0, 0); 539 } 540 541 /** 542 * gfs2_log_flush - flush incore transaction(s) 543 * @sdp: the filesystem 544 * @gl: The glock structure to flush. If NULL, flush the whole incore log 545 * 546 */ 547 548 void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) 549 { 550 struct gfs2_ail *ai; 551 552 down_write(&sdp->sd_log_flush_lock); 553 554 if (gl) { 555 gfs2_log_lock(sdp); 556 if (list_empty(&gl->gl_le.le_list)) { 557 gfs2_log_unlock(sdp); 558 up_write(&sdp->sd_log_flush_lock); 559 return; 560 } 561 gfs2_log_unlock(sdp); 562 } 563 564 ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); 565 INIT_LIST_HEAD(&ai->ai_ail1_list); 566 INIT_LIST_HEAD(&ai->ai_ail2_list); 567 568 gfs2_assert_withdraw(sdp, sdp->sd_log_num_buf == sdp->sd_log_commited_buf); 569 gfs2_assert_withdraw(sdp, 570 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); 571 572 sdp->sd_log_flush_head = sdp->sd_log_head; 573 sdp->sd_log_flush_wrapped = 0; 574 ai->ai_first = sdp->sd_log_flush_head; 575 576 lops_before_commit(sdp); 577 if (!list_empty(&sdp->sd_log_flush_list)) 578 log_flush_commit(sdp); 579 else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle) 580 log_write_header(sdp, 0, PULL); 581 lops_after_commit(sdp, ai); 582 583 gfs2_log_lock(sdp); 584 sdp->sd_log_head = sdp->sd_log_flush_head; 585 sdp->sd_log_blks_free -= sdp->sd_log_num_hdrs; 586 sdp->sd_log_blks_reserved = 0; 587 sdp->sd_log_commited_buf = 0; 588 sdp->sd_log_num_hdrs = 0; 589 sdp->sd_log_commited_revoke = 0; 590 591 if (!list_empty(&ai->ai_ail1_list)) { 592 list_add(&ai->ai_list, &sdp->sd_ail1_list); 593 ai = NULL; 594 } 595 gfs2_log_unlock(sdp); 596 597 sdp->sd_vfs->s_dirt = 0; 598 up_write(&sdp->sd_log_flush_lock); 599 600 kfree(ai); 601 } 602 603 static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 604 { 605 unsigned int reserved = 0; 606 unsigned int old; 607 608 gfs2_log_lock(sdp); 609 610 sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; 611 gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_buf) >= 0); 612 sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; 613 gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); 614 615 if (sdp->sd_log_commited_buf) 616 reserved += sdp->sd_log_commited_buf; 617 if (sdp->sd_log_commited_revoke) 618 reserved += gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, 619 sizeof(u64)); 620 if (reserved) 621 reserved++; 622 623 old = sdp->sd_log_blks_free; 624 sdp->sd_log_blks_free += tr->tr_reserved - 625 (reserved - sdp->sd_log_blks_reserved); 626 627 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old); 628 gfs2_assert_withdraw(sdp, 629 sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks + 630 sdp->sd_log_num_hdrs); 631 632 sdp->sd_log_blks_reserved = reserved; 633 634 gfs2_log_unlock(sdp); 635 } 636 637 /** 638 * gfs2_log_commit - Commit a transaction to the log 639 * @sdp: the filesystem 640 * @tr: the transaction 641 * 642 * Returns: errno 643 */ 644 645 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 646 { 647 log_refund(sdp, tr); 648 lops_incore_commit(sdp, tr); 649 650 sdp->sd_vfs->s_dirt = 1; 651 up_read(&sdp->sd_log_flush_lock); 652 653 gfs2_log_lock(sdp); 654 if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) 655 wake_up_process(sdp->sd_logd_process); 656 gfs2_log_unlock(sdp); 657 } 658 659 /** 660 * gfs2_log_shutdown - write a shutdown header into a journal 661 * @sdp: the filesystem 662 * 663 */ 664 665 void gfs2_log_shutdown(struct gfs2_sbd *sdp) 666 { 667 down_write(&sdp->sd_log_flush_lock); 668 669 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); 670 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); 671 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); 672 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_jdata); 673 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 674 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); 675 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); 676 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_hdrs); 677 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); 678 679 sdp->sd_log_flush_head = sdp->sd_log_head; 680 sdp->sd_log_flush_wrapped = 0; 681 682 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 0); 683 684 gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks); 685 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); 686 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); 687 688 sdp->sd_log_head = sdp->sd_log_flush_head; 689 sdp->sd_log_tail = sdp->sd_log_head; 690 691 up_write(&sdp->sd_log_flush_lock); 692 } 693 694 695 /** 696 * gfs2_meta_syncfs - sync all the buffers in a filesystem 697 * @sdp: the filesystem 698 * 699 */ 700 701 void gfs2_meta_syncfs(struct gfs2_sbd *sdp) 702 { 703 gfs2_log_flush(sdp, NULL); 704 for (;;) { 705 gfs2_ail1_start(sdp, DIO_ALL); 706 if (gfs2_ail1_empty(sdp, DIO_ALL)) 707 break; 708 msleep(10); 709 } 710 } 711 712