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_remove_from_ail - Remove an entry from the ail lists, updating counters 64 * @mapping: The associated mapping (maybe NULL) 65 * @bd: The gfs2_bufdata to remove 66 * 67 * The log lock _must_ be held when calling this function 68 * 69 */ 70 71 void gfs2_remove_from_ail(struct address_space *mapping, struct gfs2_bufdata *bd) 72 { 73 bd->bd_ail = NULL; 74 list_del_init(&bd->bd_ail_st_list); 75 list_del_init(&bd->bd_ail_gl_list); 76 atomic_dec(&bd->bd_gl->gl_ail_count); 77 if (mapping) 78 gfs2_meta_cache_flush(GFS2_I(mapping->host)); 79 brelse(bd->bd_bh); 80 } 81 82 /** 83 * gfs2_ail1_start_one - Start I/O on a part of the AIL 84 * @sdp: the filesystem 85 * @tr: the part of the AIL 86 * 87 */ 88 89 static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) 90 { 91 struct gfs2_bufdata *bd, *s; 92 struct buffer_head *bh; 93 int retry; 94 95 BUG_ON(!spin_is_locked(&sdp->sd_log_lock)); 96 97 do { 98 retry = 0; 99 100 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, 101 bd_ail_st_list) { 102 bh = bd->bd_bh; 103 104 gfs2_assert(sdp, bd->bd_ail == ai); 105 106 if (!buffer_busy(bh)) { 107 if (!buffer_uptodate(bh)) 108 gfs2_io_error_bh(sdp, bh); 109 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); 110 continue; 111 } 112 113 if (!buffer_dirty(bh)) 114 continue; 115 116 list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list); 117 118 get_bh(bh); 119 gfs2_log_unlock(sdp); 120 lock_buffer(bh); 121 if (test_clear_buffer_dirty(bh)) { 122 bh->b_end_io = end_buffer_write_sync; 123 submit_bh(WRITE, bh); 124 } else { 125 unlock_buffer(bh); 126 brelse(bh); 127 } 128 gfs2_log_lock(sdp); 129 130 retry = 1; 131 break; 132 } 133 } while (retry); 134 } 135 136 /** 137 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced 138 * @sdp: the filesystem 139 * @ai: the AIL entry 140 * 141 */ 142 143 static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int flags) 144 { 145 struct gfs2_bufdata *bd, *s; 146 struct buffer_head *bh; 147 148 list_for_each_entry_safe_reverse(bd, s, &ai->ai_ail1_list, 149 bd_ail_st_list) { 150 bh = bd->bd_bh; 151 152 gfs2_assert(sdp, bd->bd_ail == ai); 153 154 if (buffer_busy(bh)) { 155 if (flags & DIO_ALL) 156 continue; 157 else 158 break; 159 } 160 161 if (!buffer_uptodate(bh)) 162 gfs2_io_error_bh(sdp, bh); 163 164 list_move(&bd->bd_ail_st_list, &ai->ai_ail2_list); 165 } 166 167 return list_empty(&ai->ai_ail1_list); 168 } 169 170 static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags) 171 { 172 struct list_head *head; 173 u64 sync_gen; 174 struct list_head *first; 175 struct gfs2_ail *first_ai, *ai, *tmp; 176 int done = 0; 177 178 gfs2_log_lock(sdp); 179 head = &sdp->sd_ail1_list; 180 if (list_empty(head)) { 181 gfs2_log_unlock(sdp); 182 return; 183 } 184 sync_gen = sdp->sd_ail_sync_gen++; 185 186 first = head->prev; 187 first_ai = list_entry(first, struct gfs2_ail, ai_list); 188 first_ai->ai_sync_gen = sync_gen; 189 gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */ 190 191 if (flags & DIO_ALL) 192 first = NULL; 193 194 while(!done) { 195 if (first && (head->prev != first || 196 gfs2_ail1_empty_one(sdp, first_ai, 0))) 197 break; 198 199 done = 1; 200 list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) { 201 if (ai->ai_sync_gen >= sync_gen) 202 continue; 203 ai->ai_sync_gen = sync_gen; 204 gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */ 205 done = 0; 206 break; 207 } 208 } 209 210 gfs2_log_unlock(sdp); 211 } 212 213 int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags) 214 { 215 struct gfs2_ail *ai, *s; 216 int ret; 217 218 gfs2_log_lock(sdp); 219 220 list_for_each_entry_safe_reverse(ai, s, &sdp->sd_ail1_list, ai_list) { 221 if (gfs2_ail1_empty_one(sdp, ai, flags)) 222 list_move(&ai->ai_list, &sdp->sd_ail2_list); 223 else if (!(flags & DIO_ALL)) 224 break; 225 } 226 227 ret = list_empty(&sdp->sd_ail1_list); 228 229 gfs2_log_unlock(sdp); 230 231 return ret; 232 } 233 234 235 /** 236 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced 237 * @sdp: the filesystem 238 * @ai: the AIL entry 239 * 240 */ 241 242 static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai) 243 { 244 struct list_head *head = &ai->ai_ail2_list; 245 struct gfs2_bufdata *bd; 246 247 while (!list_empty(head)) { 248 bd = list_entry(head->prev, struct gfs2_bufdata, 249 bd_ail_st_list); 250 gfs2_assert(sdp, bd->bd_ail == ai); 251 gfs2_remove_from_ail(bd->bd_bh->b_page->mapping, bd); 252 } 253 } 254 255 static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail) 256 { 257 struct gfs2_ail *ai, *safe; 258 unsigned int old_tail = sdp->sd_log_tail; 259 int wrap = (new_tail < old_tail); 260 int a, b, rm; 261 262 gfs2_log_lock(sdp); 263 264 list_for_each_entry_safe(ai, safe, &sdp->sd_ail2_list, ai_list) { 265 a = (old_tail <= ai->ai_first); 266 b = (ai->ai_first < new_tail); 267 rm = (wrap) ? (a || b) : (a && b); 268 if (!rm) 269 continue; 270 271 gfs2_ail2_empty_one(sdp, ai); 272 list_del(&ai->ai_list); 273 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail1_list)); 274 gfs2_assert_warn(sdp, list_empty(&ai->ai_ail2_list)); 275 kfree(ai); 276 } 277 278 gfs2_log_unlock(sdp); 279 } 280 281 /** 282 * gfs2_log_reserve - Make a log reservation 283 * @sdp: The GFS2 superblock 284 * @blks: The number of blocks to reserve 285 * 286 * Note that we never give out the last few blocks of the journal. Thats 287 * due to the fact that there is a small number of header blocks 288 * associated with each log flush. The exact number can't be known until 289 * flush time, so we ensure that we have just enough free blocks at all 290 * times to avoid running out during a log flush. 291 * 292 * Returns: errno 293 */ 294 295 int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks) 296 { 297 unsigned int try = 0; 298 unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize); 299 300 if (gfs2_assert_warn(sdp, blks) || 301 gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks)) 302 return -EINVAL; 303 304 mutex_lock(&sdp->sd_log_reserve_mutex); 305 gfs2_log_lock(sdp); 306 while(sdp->sd_log_blks_free <= (blks + reserved_blks)) { 307 gfs2_log_unlock(sdp); 308 gfs2_ail1_empty(sdp, 0); 309 gfs2_log_flush(sdp, NULL); 310 311 if (try++) 312 gfs2_ail1_start(sdp, 0); 313 gfs2_log_lock(sdp); 314 } 315 sdp->sd_log_blks_free -= blks; 316 gfs2_log_unlock(sdp); 317 mutex_unlock(&sdp->sd_log_reserve_mutex); 318 319 down_read(&sdp->sd_log_flush_lock); 320 321 return 0; 322 } 323 324 /** 325 * gfs2_log_release - Release a given number of log blocks 326 * @sdp: The GFS2 superblock 327 * @blks: The number of blocks 328 * 329 */ 330 331 void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) 332 { 333 334 gfs2_log_lock(sdp); 335 sdp->sd_log_blks_free += blks; 336 gfs2_assert_withdraw(sdp, 337 sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); 338 gfs2_log_unlock(sdp); 339 up_read(&sdp->sd_log_flush_lock); 340 } 341 342 static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn) 343 { 344 struct inode *inode = sdp->sd_jdesc->jd_inode; 345 int error; 346 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 347 348 bh_map.b_size = 1 << inode->i_blkbits; 349 error = gfs2_block_map(inode, lbn, 0, &bh_map); 350 if (error || !bh_map.b_blocknr) 351 printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error, 352 (unsigned long long)bh_map.b_blocknr, lbn); 353 gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr); 354 355 return bh_map.b_blocknr; 356 } 357 358 /** 359 * log_distance - Compute distance between two journal blocks 360 * @sdp: The GFS2 superblock 361 * @newer: The most recent journal block of the pair 362 * @older: The older journal block of the pair 363 * 364 * Compute the distance (in the journal direction) between two 365 * blocks in the journal 366 * 367 * Returns: the distance in blocks 368 */ 369 370 static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer, 371 unsigned int older) 372 { 373 int dist; 374 375 dist = newer - older; 376 if (dist < 0) 377 dist += sdp->sd_jdesc->jd_blocks; 378 379 return dist; 380 } 381 382 /** 383 * calc_reserved - Calculate the number of blocks to reserve when 384 * refunding a transaction's unused buffers. 385 * @sdp: The GFS2 superblock 386 * 387 * This is complex. We need to reserve room for all our currently used 388 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and 389 * all our journaled data buffers for journaled files (e.g. files in the 390 * meta_fs like rindex, or files for which chattr +j was done.) 391 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush 392 * will count it as free space (sd_log_blks_free) and corruption will follow. 393 * 394 * We can have metadata bufs and jdata bufs in the same journal. So each 395 * type gets its own log header, for which we need to reserve a block. 396 * In fact, each type has the potential for needing more than one header 397 * in cases where we have more buffers than will fit on a journal page. 398 * Metadata journal entries take up half the space of journaled buffer entries. 399 * Thus, metadata entries have buf_limit (502) and journaled buffers have 400 * databuf_limit (251) before they cause a wrap around. 401 * 402 * Also, we need to reserve blocks for revoke journal entries and one for an 403 * overall header for the lot. 404 * 405 * Returns: the number of blocks reserved 406 */ 407 static unsigned int calc_reserved(struct gfs2_sbd *sdp) 408 { 409 unsigned int reserved = 0; 410 unsigned int mbuf_limit, metabufhdrs_needed; 411 unsigned int dbuf_limit, databufhdrs_needed; 412 unsigned int revokes = 0; 413 414 mbuf_limit = buf_limit(sdp); 415 metabufhdrs_needed = (sdp->sd_log_commited_buf + 416 (mbuf_limit - 1)) / mbuf_limit; 417 dbuf_limit = databuf_limit(sdp); 418 databufhdrs_needed = (sdp->sd_log_commited_databuf + 419 (dbuf_limit - 1)) / dbuf_limit; 420 421 if (sdp->sd_log_commited_revoke) 422 revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke, 423 sizeof(u64)); 424 425 reserved = sdp->sd_log_commited_buf + metabufhdrs_needed + 426 sdp->sd_log_commited_databuf + databufhdrs_needed + 427 revokes; 428 /* One for the overall header */ 429 if (reserved) 430 reserved++; 431 return reserved; 432 } 433 434 static unsigned int current_tail(struct gfs2_sbd *sdp) 435 { 436 struct gfs2_ail *ai; 437 unsigned int tail; 438 439 gfs2_log_lock(sdp); 440 441 if (list_empty(&sdp->sd_ail1_list)) { 442 tail = sdp->sd_log_head; 443 } else { 444 ai = list_entry(sdp->sd_ail1_list.prev, struct gfs2_ail, ai_list); 445 tail = ai->ai_first; 446 } 447 448 gfs2_log_unlock(sdp); 449 450 return tail; 451 } 452 453 void gfs2_log_incr_head(struct gfs2_sbd *sdp) 454 { 455 if (sdp->sd_log_flush_head == sdp->sd_log_tail) 456 BUG_ON(sdp->sd_log_flush_head != sdp->sd_log_head); 457 458 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) { 459 sdp->sd_log_flush_head = 0; 460 sdp->sd_log_flush_wrapped = 1; 461 } 462 } 463 464 /** 465 * gfs2_log_write_endio - End of I/O for a log buffer 466 * @bh: The buffer head 467 * @uptodate: I/O Status 468 * 469 */ 470 471 static void gfs2_log_write_endio(struct buffer_head *bh, int uptodate) 472 { 473 struct gfs2_sbd *sdp = bh->b_private; 474 bh->b_private = NULL; 475 476 end_buffer_write_sync(bh, uptodate); 477 if (atomic_dec_and_test(&sdp->sd_log_in_flight)) 478 wake_up(&sdp->sd_log_flush_wait); 479 } 480 481 /** 482 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data 483 * @sdp: The GFS2 superblock 484 * 485 * Returns: the buffer_head 486 */ 487 488 struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp) 489 { 490 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); 491 struct buffer_head *bh; 492 493 bh = sb_getblk(sdp->sd_vfs, blkno); 494 lock_buffer(bh); 495 memset(bh->b_data, 0, bh->b_size); 496 set_buffer_uptodate(bh); 497 clear_buffer_dirty(bh); 498 gfs2_log_incr_head(sdp); 499 atomic_inc(&sdp->sd_log_in_flight); 500 bh->b_private = sdp; 501 bh->b_end_io = gfs2_log_write_endio; 502 503 return bh; 504 } 505 506 /** 507 * gfs2_fake_write_endio - 508 * @bh: The buffer head 509 * @uptodate: The I/O Status 510 * 511 */ 512 513 static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate) 514 { 515 struct buffer_head *real_bh = bh->b_private; 516 struct gfs2_bufdata *bd = real_bh->b_private; 517 struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd; 518 519 end_buffer_write_sync(bh, uptodate); 520 free_buffer_head(bh); 521 unlock_buffer(real_bh); 522 brelse(real_bh); 523 if (atomic_dec_and_test(&sdp->sd_log_in_flight)) 524 wake_up(&sdp->sd_log_flush_wait); 525 } 526 527 /** 528 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log 529 * @sdp: the filesystem 530 * @data: the data the buffer_head should point to 531 * 532 * Returns: the log buffer descriptor 533 */ 534 535 struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp, 536 struct buffer_head *real) 537 { 538 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); 539 struct buffer_head *bh; 540 541 bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL); 542 atomic_set(&bh->b_count, 1); 543 bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock); 544 set_bh_page(bh, real->b_page, bh_offset(real)); 545 bh->b_blocknr = blkno; 546 bh->b_size = sdp->sd_sb.sb_bsize; 547 bh->b_bdev = sdp->sd_vfs->s_bdev; 548 bh->b_private = real; 549 bh->b_end_io = gfs2_fake_write_endio; 550 551 gfs2_log_incr_head(sdp); 552 atomic_inc(&sdp->sd_log_in_flight); 553 554 return bh; 555 } 556 557 static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail) 558 { 559 unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail); 560 561 ail2_empty(sdp, new_tail); 562 563 gfs2_log_lock(sdp); 564 sdp->sd_log_blks_free += dist; 565 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks); 566 gfs2_log_unlock(sdp); 567 568 sdp->sd_log_tail = new_tail; 569 } 570 571 /** 572 * log_write_header - Get and initialize a journal header buffer 573 * @sdp: The GFS2 superblock 574 * 575 * Returns: the initialized log buffer descriptor 576 */ 577 578 static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull) 579 { 580 u64 blkno = log_bmap(sdp, sdp->sd_log_flush_head); 581 struct buffer_head *bh; 582 struct gfs2_log_header *lh; 583 unsigned int tail; 584 u32 hash; 585 586 bh = sb_getblk(sdp->sd_vfs, blkno); 587 lock_buffer(bh); 588 memset(bh->b_data, 0, bh->b_size); 589 set_buffer_uptodate(bh); 590 clear_buffer_dirty(bh); 591 unlock_buffer(bh); 592 593 gfs2_ail1_empty(sdp, 0); 594 tail = current_tail(sdp); 595 596 lh = (struct gfs2_log_header *)bh->b_data; 597 memset(lh, 0, sizeof(struct gfs2_log_header)); 598 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 599 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH); 600 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH); 601 lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++); 602 lh->lh_flags = cpu_to_be32(flags); 603 lh->lh_tail = cpu_to_be32(tail); 604 lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head); 605 hash = gfs2_disk_hash(bh->b_data, sizeof(struct gfs2_log_header)); 606 lh->lh_hash = cpu_to_be32(hash); 607 608 set_buffer_dirty(bh); 609 if (sync_dirty_buffer(bh)) 610 gfs2_io_error_bh(sdp, bh); 611 brelse(bh); 612 613 if (sdp->sd_log_tail != tail) 614 log_pull_tail(sdp, tail); 615 else 616 gfs2_assert_withdraw(sdp, !pull); 617 618 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head); 619 gfs2_log_incr_head(sdp); 620 } 621 622 static void log_flush_commit(struct gfs2_sbd *sdp) 623 { 624 DEFINE_WAIT(wait); 625 626 if (atomic_read(&sdp->sd_log_in_flight)) { 627 do { 628 prepare_to_wait(&sdp->sd_log_flush_wait, &wait, 629 TASK_UNINTERRUPTIBLE); 630 if (atomic_read(&sdp->sd_log_in_flight)) 631 io_schedule(); 632 } while(atomic_read(&sdp->sd_log_in_flight)); 633 finish_wait(&sdp->sd_log_flush_wait, &wait); 634 } 635 636 log_write_header(sdp, 0, 0); 637 } 638 639 static void gfs2_ordered_write(struct gfs2_sbd *sdp) 640 { 641 struct gfs2_bufdata *bd; 642 struct buffer_head *bh; 643 LIST_HEAD(written); 644 645 gfs2_log_lock(sdp); 646 while (!list_empty(&sdp->sd_log_le_ordered)) { 647 bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list); 648 list_move(&bd->bd_le.le_list, &written); 649 bh = bd->bd_bh; 650 if (!buffer_dirty(bh)) 651 continue; 652 get_bh(bh); 653 gfs2_log_unlock(sdp); 654 lock_buffer(bh); 655 if (test_clear_buffer_dirty(bh)) { 656 bh->b_end_io = end_buffer_write_sync; 657 submit_bh(WRITE, bh); 658 } else { 659 unlock_buffer(bh); 660 brelse(bh); 661 } 662 gfs2_log_lock(sdp); 663 } 664 list_splice(&written, &sdp->sd_log_le_ordered); 665 gfs2_log_unlock(sdp); 666 } 667 668 static void gfs2_ordered_wait(struct gfs2_sbd *sdp) 669 { 670 struct gfs2_bufdata *bd; 671 struct buffer_head *bh; 672 673 gfs2_log_lock(sdp); 674 while (!list_empty(&sdp->sd_log_le_ordered)) { 675 bd = list_entry(sdp->sd_log_le_ordered.prev, struct gfs2_bufdata, bd_le.le_list); 676 bh = bd->bd_bh; 677 if (buffer_locked(bh)) { 678 get_bh(bh); 679 gfs2_log_unlock(sdp); 680 wait_on_buffer(bh); 681 brelse(bh); 682 gfs2_log_lock(sdp); 683 continue; 684 } 685 list_del_init(&bd->bd_le.le_list); 686 } 687 gfs2_log_unlock(sdp); 688 } 689 690 /** 691 * gfs2_log_flush - flush incore transaction(s) 692 * @sdp: the filesystem 693 * @gl: The glock structure to flush. If NULL, flush the whole incore log 694 * 695 */ 696 697 void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl) 698 { 699 struct gfs2_ail *ai; 700 701 down_write(&sdp->sd_log_flush_lock); 702 703 if (gl) { 704 gfs2_log_lock(sdp); 705 if (list_empty(&gl->gl_le.le_list)) { 706 gfs2_log_unlock(sdp); 707 up_write(&sdp->sd_log_flush_lock); 708 return; 709 } 710 gfs2_log_unlock(sdp); 711 } 712 713 ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL); 714 INIT_LIST_HEAD(&ai->ai_ail1_list); 715 INIT_LIST_HEAD(&ai->ai_ail2_list); 716 717 if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) { 718 printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf, 719 sdp->sd_log_commited_buf); 720 gfs2_assert_withdraw(sdp, 0); 721 } 722 if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) { 723 printk(KERN_INFO "GFS2: log databuf %u %u\n", 724 sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf); 725 gfs2_assert_withdraw(sdp, 0); 726 } 727 gfs2_assert_withdraw(sdp, 728 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke); 729 730 sdp->sd_log_flush_head = sdp->sd_log_head; 731 sdp->sd_log_flush_wrapped = 0; 732 ai->ai_first = sdp->sd_log_flush_head; 733 734 gfs2_ordered_write(sdp); 735 lops_before_commit(sdp); 736 gfs2_ordered_wait(sdp); 737 738 if (sdp->sd_log_head != sdp->sd_log_flush_head) 739 log_flush_commit(sdp); 740 else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){ 741 gfs2_log_lock(sdp); 742 sdp->sd_log_blks_free--; /* Adjust for unreserved buffer */ 743 gfs2_log_unlock(sdp); 744 log_write_header(sdp, 0, PULL); 745 } 746 lops_after_commit(sdp, ai); 747 748 gfs2_log_lock(sdp); 749 sdp->sd_log_head = sdp->sd_log_flush_head; 750 sdp->sd_log_blks_reserved = 0; 751 sdp->sd_log_commited_buf = 0; 752 sdp->sd_log_commited_databuf = 0; 753 sdp->sd_log_commited_revoke = 0; 754 755 if (!list_empty(&ai->ai_ail1_list)) { 756 list_add(&ai->ai_list, &sdp->sd_ail1_list); 757 ai = NULL; 758 } 759 gfs2_log_unlock(sdp); 760 761 sdp->sd_vfs->s_dirt = 0; 762 up_write(&sdp->sd_log_flush_lock); 763 764 kfree(ai); 765 } 766 767 static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 768 { 769 unsigned int reserved; 770 unsigned int old; 771 772 gfs2_log_lock(sdp); 773 774 sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm; 775 sdp->sd_log_commited_databuf += tr->tr_num_databuf_new - 776 tr->tr_num_databuf_rm; 777 gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) || 778 (((int)sdp->sd_log_commited_databuf) >= 0)); 779 sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm; 780 gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0); 781 reserved = calc_reserved(sdp); 782 old = sdp->sd_log_blks_free; 783 sdp->sd_log_blks_free += tr->tr_reserved - 784 (reserved - sdp->sd_log_blks_reserved); 785 786 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old); 787 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= 788 sdp->sd_jdesc->jd_blocks); 789 790 sdp->sd_log_blks_reserved = reserved; 791 792 gfs2_log_unlock(sdp); 793 } 794 795 /** 796 * gfs2_log_commit - Commit a transaction to the log 797 * @sdp: the filesystem 798 * @tr: the transaction 799 * 800 * Returns: errno 801 */ 802 803 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) 804 { 805 log_refund(sdp, tr); 806 lops_incore_commit(sdp, tr); 807 808 sdp->sd_vfs->s_dirt = 1; 809 up_read(&sdp->sd_log_flush_lock); 810 811 gfs2_log_lock(sdp); 812 if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks)) 813 wake_up_process(sdp->sd_logd_process); 814 gfs2_log_unlock(sdp); 815 } 816 817 /** 818 * gfs2_log_shutdown - write a shutdown header into a journal 819 * @sdp: the filesystem 820 * 821 */ 822 823 void gfs2_log_shutdown(struct gfs2_sbd *sdp) 824 { 825 down_write(&sdp->sd_log_flush_lock); 826 827 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved); 828 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl); 829 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf); 830 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke); 831 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg); 832 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf); 833 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list)); 834 835 sdp->sd_log_flush_head = sdp->sd_log_head; 836 sdp->sd_log_flush_wrapped = 0; 837 838 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT, 839 (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL); 840 841 gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks); 842 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail); 843 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list)); 844 845 sdp->sd_log_head = sdp->sd_log_flush_head; 846 sdp->sd_log_tail = sdp->sd_log_head; 847 848 up_write(&sdp->sd_log_flush_lock); 849 } 850 851 852 /** 853 * gfs2_meta_syncfs - sync all the buffers in a filesystem 854 * @sdp: the filesystem 855 * 856 */ 857 858 void gfs2_meta_syncfs(struct gfs2_sbd *sdp) 859 { 860 gfs2_log_flush(sdp, NULL); 861 for (;;) { 862 gfs2_ail1_start(sdp, DIO_ALL); 863 if (gfs2_ail1_empty(sdp, DIO_ALL)) 864 break; 865 msleep(10); 866 } 867 } 868 869