1/* 2** Write ahead logging implementation copyright Chris Mason 2000 3** 4** The background commits make this code very interelated, and 5** overly complex. I need to rethink things a bit....The major players: 6** 7** journal_begin -- call with the number of blocks you expect to log. 8** If the current transaction is too 9** old, it will block until the current transaction is 10** finished, and then start a new one. 11** Usually, your transaction will get joined in with 12** previous ones for speed. 13** 14** journal_join -- same as journal_begin, but won't block on the current 15** transaction regardless of age. Don't ever call 16** this. Ever. There are only two places it should be 17** called from, and they are both inside this file. 18** 19** journal_mark_dirty -- adds blocks into this transaction. clears any flags 20** that might make them get sent to disk 21** and then marks them BH_JDirty. Puts the buffer head 22** into the current transaction hash. 23** 24** journal_end -- if the current transaction is batchable, it does nothing 25** otherwise, it could do an async/synchronous commit, or 26** a full flush of all log and real blocks in the 27** transaction. 28** 29** flush_old_commits -- if the current transaction is too old, it is ended and 30** commit blocks are sent to disk. Forces commit blocks 31** to disk for all backgrounded commits that have been 32** around too long. 33** -- Note, if you call this as an immediate flush from 34** from within kupdate, it will ignore the immediate flag 35*/ 36 37#include <linux/time.h> 38#include <linux/semaphore.h> 39#include <linux/vmalloc.h> 40#include <linux/reiserfs_fs.h> 41#include <linux/kernel.h> 42#include <linux/errno.h> 43#include <linux/fcntl.h> 44#include <linux/stat.h> 45#include <linux/string.h> 46#include <linux/smp_lock.h> 47#include <linux/buffer_head.h> 48#include <linux/workqueue.h> 49#include <linux/writeback.h> 50#include <linux/blkdev.h> 51#include <linux/backing-dev.h> 52#include <linux/uaccess.h> 53#include <linux/slab.h> 54 55#include <asm/system.h> 56 57/* gets a struct reiserfs_journal_list * from a list head */ 58#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ 59 j_list)) 60#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ 61 j_working_list)) 62 63/* the number of mounted filesystems. This is used to decide when to 64** start and kill the commit workqueue 65*/ 66static int reiserfs_mounted_fs_count; 67 68static struct workqueue_struct *commit_wq; 69 70#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit 71 structs at 4k */ 72#define BUFNR 64 /*read ahead */ 73 74/* cnode stat bits. Move these into reiserfs_fs.h */ 75 76#define BLOCK_FREED 2 /* this block was freed, and can't be written. */ 77#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */ 78 79#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */ 80#define BLOCK_DIRTIED 5 81 82/* journal list state bits */ 83#define LIST_TOUCHED 1 84#define LIST_DIRTY 2 85#define LIST_COMMIT_PENDING 4 /* someone will commit this list */ 86 87/* flags for do_journal_end */ 88#define FLUSH_ALL 1 /* flush commit and real blocks */ 89#define COMMIT_NOW 2 /* end and commit this transaction */ 90#define WAIT 4 /* wait for the log blocks to hit the disk */ 91 92static int do_journal_end(struct reiserfs_transaction_handle *, 93 struct super_block *, unsigned long nblocks, 94 int flags); 95static int flush_journal_list(struct super_block *s, 96 struct reiserfs_journal_list *jl, int flushall); 97static int flush_commit_list(struct super_block *s, 98 struct reiserfs_journal_list *jl, int flushall); 99static int can_dirty(struct reiserfs_journal_cnode *cn); 100static int journal_join(struct reiserfs_transaction_handle *th, 101 struct super_block *sb, unsigned long nblocks); 102static int release_journal_dev(struct super_block *super, 103 struct reiserfs_journal *journal); 104static int dirty_one_transaction(struct super_block *s, 105 struct reiserfs_journal_list *jl); 106static void flush_async_commits(struct work_struct *work); 107static void queue_log_writer(struct super_block *s); 108 109/* values for join in do_journal_begin_r */ 110enum { 111 JBEGIN_REG = 0, /* regular journal begin */ 112 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */ 113 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */ 114}; 115 116static int do_journal_begin_r(struct reiserfs_transaction_handle *th, 117 struct super_block *sb, 118 unsigned long nblocks, int join); 119 120static void init_journal_hash(struct super_block *sb) 121{ 122 struct reiserfs_journal *journal = SB_JOURNAL(sb); 123 memset(journal->j_hash_table, 0, 124 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); 125} 126 127/* 128** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to 129** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for 130** more details. 131*/ 132static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) 133{ 134 if (bh) { 135 clear_buffer_dirty(bh); 136 clear_buffer_journal_test(bh); 137 } 138 return 0; 139} 140 141static void disable_barrier(struct super_block *s) 142{ 143 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH); 144 printk("reiserfs: disabling flush barriers on %s\n", 145 reiserfs_bdevname(s)); 146} 147 148static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block 149 *sb) 150{ 151 struct reiserfs_bitmap_node *bn; 152 static int id; 153 154 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS); 155 if (!bn) { 156 return NULL; 157 } 158 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS); 159 if (!bn->data) { 160 kfree(bn); 161 return NULL; 162 } 163 bn->id = id++; 164 INIT_LIST_HEAD(&bn->list); 165 return bn; 166} 167 168static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb) 169{ 170 struct reiserfs_journal *journal = SB_JOURNAL(sb); 171 struct reiserfs_bitmap_node *bn = NULL; 172 struct list_head *entry = journal->j_bitmap_nodes.next; 173 174 journal->j_used_bitmap_nodes++; 175 repeat: 176 177 if (entry != &journal->j_bitmap_nodes) { 178 bn = list_entry(entry, struct reiserfs_bitmap_node, list); 179 list_del(entry); 180 memset(bn->data, 0, sb->s_blocksize); 181 journal->j_free_bitmap_nodes--; 182 return bn; 183 } 184 bn = allocate_bitmap_node(sb); 185 if (!bn) { 186 yield(); 187 goto repeat; 188 } 189 return bn; 190} 191static inline void free_bitmap_node(struct super_block *sb, 192 struct reiserfs_bitmap_node *bn) 193{ 194 struct reiserfs_journal *journal = SB_JOURNAL(sb); 195 journal->j_used_bitmap_nodes--; 196 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { 197 kfree(bn->data); 198 kfree(bn); 199 } else { 200 list_add(&bn->list, &journal->j_bitmap_nodes); 201 journal->j_free_bitmap_nodes++; 202 } 203} 204 205static void allocate_bitmap_nodes(struct super_block *sb) 206{ 207 int i; 208 struct reiserfs_journal *journal = SB_JOURNAL(sb); 209 struct reiserfs_bitmap_node *bn = NULL; 210 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) { 211 bn = allocate_bitmap_node(sb); 212 if (bn) { 213 list_add(&bn->list, &journal->j_bitmap_nodes); 214 journal->j_free_bitmap_nodes++; 215 } else { 216 break; /* this is ok, we'll try again when more are needed */ 217 } 218 } 219} 220 221static int set_bit_in_list_bitmap(struct super_block *sb, 222 b_blocknr_t block, 223 struct reiserfs_list_bitmap *jb) 224{ 225 unsigned int bmap_nr = block / (sb->s_blocksize << 3); 226 unsigned int bit_nr = block % (sb->s_blocksize << 3); 227 228 if (!jb->bitmaps[bmap_nr]) { 229 jb->bitmaps[bmap_nr] = get_bitmap_node(sb); 230 } 231 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data); 232 return 0; 233} 234 235static void cleanup_bitmap_list(struct super_block *sb, 236 struct reiserfs_list_bitmap *jb) 237{ 238 int i; 239 if (jb->bitmaps == NULL) 240 return; 241 242 for (i = 0; i < reiserfs_bmap_count(sb); i++) { 243 if (jb->bitmaps[i]) { 244 free_bitmap_node(sb, jb->bitmaps[i]); 245 jb->bitmaps[i] = NULL; 246 } 247 } 248} 249 250/* 251** only call this on FS unmount. 252*/ 253static int free_list_bitmaps(struct super_block *sb, 254 struct reiserfs_list_bitmap *jb_array) 255{ 256 int i; 257 struct reiserfs_list_bitmap *jb; 258 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 259 jb = jb_array + i; 260 jb->journal_list = NULL; 261 cleanup_bitmap_list(sb, jb); 262 vfree(jb->bitmaps); 263 jb->bitmaps = NULL; 264 } 265 return 0; 266} 267 268static int free_bitmap_nodes(struct super_block *sb) 269{ 270 struct reiserfs_journal *journal = SB_JOURNAL(sb); 271 struct list_head *next = journal->j_bitmap_nodes.next; 272 struct reiserfs_bitmap_node *bn; 273 274 while (next != &journal->j_bitmap_nodes) { 275 bn = list_entry(next, struct reiserfs_bitmap_node, list); 276 list_del(next); 277 kfree(bn->data); 278 kfree(bn); 279 next = journal->j_bitmap_nodes.next; 280 journal->j_free_bitmap_nodes--; 281 } 282 283 return 0; 284} 285 286/* 287** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. 288** jb_array is the array to be filled in. 289*/ 290int reiserfs_allocate_list_bitmaps(struct super_block *sb, 291 struct reiserfs_list_bitmap *jb_array, 292 unsigned int bmap_nr) 293{ 294 int i; 295 int failed = 0; 296 struct reiserfs_list_bitmap *jb; 297 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *); 298 299 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 300 jb = jb_array + i; 301 jb->journal_list = NULL; 302 jb->bitmaps = vmalloc(mem); 303 if (!jb->bitmaps) { 304 reiserfs_warning(sb, "clm-2000", "unable to " 305 "allocate bitmaps for journal lists"); 306 failed = 1; 307 break; 308 } 309 memset(jb->bitmaps, 0, mem); 310 } 311 if (failed) { 312 free_list_bitmaps(sb, jb_array); 313 return -1; 314 } 315 return 0; 316} 317 318/* 319** find an available list bitmap. If you can't find one, flush a commit list 320** and try again 321*/ 322static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb, 323 struct reiserfs_journal_list 324 *jl) 325{ 326 int i, j; 327 struct reiserfs_journal *journal = SB_JOURNAL(sb); 328 struct reiserfs_list_bitmap *jb = NULL; 329 330 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) { 331 i = journal->j_list_bitmap_index; 332 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS; 333 jb = journal->j_list_bitmap + i; 334 if (journal->j_list_bitmap[i].journal_list) { 335 flush_commit_list(sb, 336 journal->j_list_bitmap[i]. 337 journal_list, 1); 338 if (!journal->j_list_bitmap[i].journal_list) { 339 break; 340 } 341 } else { 342 break; 343 } 344 } 345 if (jb->journal_list) { /* double check to make sure if flushed correctly */ 346 return NULL; 347 } 348 jb->journal_list = jl; 349 return jb; 350} 351 352/* 353** allocates a new chunk of X nodes, and links them all together as a list. 354** Uses the cnode->next and cnode->prev pointers 355** returns NULL on failure 356*/ 357static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) 358{ 359 struct reiserfs_journal_cnode *head; 360 int i; 361 if (num_cnodes <= 0) { 362 return NULL; 363 } 364 head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)); 365 if (!head) { 366 return NULL; 367 } 368 memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)); 369 head[0].prev = NULL; 370 head[0].next = head + 1; 371 for (i = 1; i < num_cnodes; i++) { 372 head[i].prev = head + (i - 1); 373 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */ 374 } 375 head[num_cnodes - 1].next = NULL; 376 return head; 377} 378 379/* 380** pulls a cnode off the free list, or returns NULL on failure 381*/ 382static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb) 383{ 384 struct reiserfs_journal_cnode *cn; 385 struct reiserfs_journal *journal = SB_JOURNAL(sb); 386 387 reiserfs_check_lock_depth(sb, "get_cnode"); 388 389 if (journal->j_cnode_free <= 0) { 390 return NULL; 391 } 392 journal->j_cnode_used++; 393 journal->j_cnode_free--; 394 cn = journal->j_cnode_free_list; 395 if (!cn) { 396 return cn; 397 } 398 if (cn->next) { 399 cn->next->prev = NULL; 400 } 401 journal->j_cnode_free_list = cn->next; 402 memset(cn, 0, sizeof(struct reiserfs_journal_cnode)); 403 return cn; 404} 405 406/* 407** returns a cnode to the free list 408*/ 409static void free_cnode(struct super_block *sb, 410 struct reiserfs_journal_cnode *cn) 411{ 412 struct reiserfs_journal *journal = SB_JOURNAL(sb); 413 414 reiserfs_check_lock_depth(sb, "free_cnode"); 415 416 journal->j_cnode_used--; 417 journal->j_cnode_free++; 418 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ 419 cn->next = journal->j_cnode_free_list; 420 if (journal->j_cnode_free_list) { 421 journal->j_cnode_free_list->prev = cn; 422 } 423 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */ 424 journal->j_cnode_free_list = cn; 425} 426 427static void clear_prepared_bits(struct buffer_head *bh) 428{ 429 clear_buffer_journal_prepared(bh); 430 clear_buffer_journal_restore_dirty(bh); 431} 432 433/* return a cnode with same dev, block number and size in table, or null if not found */ 434static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct 435 super_block 436 *sb, 437 struct 438 reiserfs_journal_cnode 439 **table, 440 long bl) 441{ 442 struct reiserfs_journal_cnode *cn; 443 cn = journal_hash(table, sb, bl); 444 while (cn) { 445 if (cn->blocknr == bl && cn->sb == sb) 446 return cn; 447 cn = cn->hnext; 448 } 449 return (struct reiserfs_journal_cnode *)0; 450} 451 452/* 453** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated 454** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever 455** being overwritten by a replay after crashing. 456** 457** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting 458** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make 459** sure you never write the block without logging it. 460** 461** next_zero_bit is a suggestion about the next block to try for find_forward. 462** when bl is rejected because it is set in a journal list bitmap, we search 463** for the next zero bit in the bitmap that rejected bl. Then, we return that 464** through next_zero_bit for find_forward to try. 465** 466** Just because we return something in next_zero_bit does not mean we won't 467** reject it on the next call to reiserfs_in_journal 468** 469*/ 470int reiserfs_in_journal(struct super_block *sb, 471 unsigned int bmap_nr, int bit_nr, int search_all, 472 b_blocknr_t * next_zero_bit) 473{ 474 struct reiserfs_journal *journal = SB_JOURNAL(sb); 475 struct reiserfs_journal_cnode *cn; 476 struct reiserfs_list_bitmap *jb; 477 int i; 478 unsigned long bl; 479 480 *next_zero_bit = 0; /* always start this at zero. */ 481 482 PROC_INFO_INC(sb, journal.in_journal); 483 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use. 484 ** if we crash before the transaction that freed it commits, this transaction won't 485 ** have committed either, and the block will never be written 486 */ 487 if (search_all) { 488 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 489 PROC_INFO_INC(sb, journal.in_journal_bitmap); 490 jb = journal->j_list_bitmap + i; 491 if (jb->journal_list && jb->bitmaps[bmap_nr] && 492 test_bit(bit_nr, 493 (unsigned long *)jb->bitmaps[bmap_nr]-> 494 data)) { 495 *next_zero_bit = 496 find_next_zero_bit((unsigned long *) 497 (jb->bitmaps[bmap_nr]-> 498 data), 499 sb->s_blocksize << 3, 500 bit_nr + 1); 501 return 1; 502 } 503 } 504 } 505 506 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr; 507 /* is it in any old transactions? */ 508 if (search_all 509 && (cn = 510 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) { 511 return 1; 512 } 513 514 /* is it in the current transaction. This should never happen */ 515 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) { 516 BUG(); 517 return 1; 518 } 519 520 PROC_INFO_INC(sb, journal.in_journal_reusable); 521 /* safe for reuse */ 522 return 0; 523} 524 525/* insert cn into table 526*/ 527static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, 528 struct reiserfs_journal_cnode *cn) 529{ 530 struct reiserfs_journal_cnode *cn_orig; 531 532 cn_orig = journal_hash(table, cn->sb, cn->blocknr); 533 cn->hnext = cn_orig; 534 cn->hprev = NULL; 535 if (cn_orig) { 536 cn_orig->hprev = cn; 537 } 538 journal_hash(table, cn->sb, cn->blocknr) = cn; 539} 540 541/* lock the current transaction */ 542static inline void lock_journal(struct super_block *sb) 543{ 544 PROC_INFO_INC(sb, journal.lock_journal); 545 546 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb); 547} 548 549/* unlock the current transaction */ 550static inline void unlock_journal(struct super_block *sb) 551{ 552 mutex_unlock(&SB_JOURNAL(sb)->j_mutex); 553} 554 555static inline void get_journal_list(struct reiserfs_journal_list *jl) 556{ 557 jl->j_refcount++; 558} 559 560static inline void put_journal_list(struct super_block *s, 561 struct reiserfs_journal_list *jl) 562{ 563 if (jl->j_refcount < 1) { 564 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d", 565 jl->j_trans_id, jl->j_refcount); 566 } 567 if (--jl->j_refcount == 0) 568 kfree(jl); 569} 570 571/* 572** this used to be much more involved, and I'm keeping it just in case things get ugly again. 573** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a 574** transaction. 575*/ 576static void cleanup_freed_for_journal_list(struct super_block *sb, 577 struct reiserfs_journal_list *jl) 578{ 579 580 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap; 581 if (jb) { 582 cleanup_bitmap_list(sb, jb); 583 } 584 jl->j_list_bitmap->journal_list = NULL; 585 jl->j_list_bitmap = NULL; 586} 587 588static int journal_list_still_alive(struct super_block *s, 589 unsigned int trans_id) 590{ 591 struct reiserfs_journal *journal = SB_JOURNAL(s); 592 struct list_head *entry = &journal->j_journal_list; 593 struct reiserfs_journal_list *jl; 594 595 if (!list_empty(entry)) { 596 jl = JOURNAL_LIST_ENTRY(entry->next); 597 if (jl->j_trans_id <= trans_id) { 598 return 1; 599 } 600 } 601 return 0; 602} 603 604/* 605 * If page->mapping was null, we failed to truncate this page for 606 * some reason. Most likely because it was truncated after being 607 * logged via data=journal. 608 * 609 * This does a check to see if the buffer belongs to one of these 610 * lost pages before doing the final put_bh. If page->mapping was 611 * null, it tries to free buffers on the page, which should make the 612 * final page_cache_release drop the page from the lru. 613 */ 614static void release_buffer_page(struct buffer_head *bh) 615{ 616 struct page *page = bh->b_page; 617 if (!page->mapping && trylock_page(page)) { 618 page_cache_get(page); 619 put_bh(bh); 620 if (!page->mapping) 621 try_to_free_buffers(page); 622 unlock_page(page); 623 page_cache_release(page); 624 } else { 625 put_bh(bh); 626 } 627} 628 629static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) 630{ 631 char b[BDEVNAME_SIZE]; 632 633 if (buffer_journaled(bh)) { 634 reiserfs_warning(NULL, "clm-2084", 635 "pinned buffer %lu:%s sent to disk", 636 bh->b_blocknr, bdevname(bh->b_bdev, b)); 637 } 638 if (uptodate) 639 set_buffer_uptodate(bh); 640 else 641 clear_buffer_uptodate(bh); 642 643 unlock_buffer(bh); 644 release_buffer_page(bh); 645} 646 647static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) 648{ 649 if (uptodate) 650 set_buffer_uptodate(bh); 651 else 652 clear_buffer_uptodate(bh); 653 unlock_buffer(bh); 654 put_bh(bh); 655} 656 657static void submit_logged_buffer(struct buffer_head *bh) 658{ 659 get_bh(bh); 660 bh->b_end_io = reiserfs_end_buffer_io_sync; 661 clear_buffer_journal_new(bh); 662 clear_buffer_dirty(bh); 663 if (!test_clear_buffer_journal_test(bh)) 664 BUG(); 665 if (!buffer_uptodate(bh)) 666 BUG(); 667 submit_bh(WRITE, bh); 668} 669 670static void submit_ordered_buffer(struct buffer_head *bh) 671{ 672 get_bh(bh); 673 bh->b_end_io = reiserfs_end_ordered_io; 674 clear_buffer_dirty(bh); 675 if (!buffer_uptodate(bh)) 676 BUG(); 677 submit_bh(WRITE, bh); 678} 679 680static int submit_barrier_buffer(struct buffer_head *bh) 681{ 682 get_bh(bh); 683 bh->b_end_io = reiserfs_end_ordered_io; 684 clear_buffer_dirty(bh); 685 if (!buffer_uptodate(bh)) 686 BUG(); 687 return submit_bh(WRITE_BARRIER, bh); 688} 689 690static void check_barrier_completion(struct super_block *s, 691 struct buffer_head *bh) 692{ 693 if (buffer_eopnotsupp(bh)) { 694 clear_buffer_eopnotsupp(bh); 695 disable_barrier(s); 696 set_buffer_uptodate(bh); 697 set_buffer_dirty(bh); 698 reiserfs_write_unlock(s); 699 sync_dirty_buffer(bh); 700 reiserfs_write_lock(s); 701 } 702} 703 704#define CHUNK_SIZE 32 705struct buffer_chunk { 706 struct buffer_head *bh[CHUNK_SIZE]; 707 int nr; 708}; 709 710static void write_chunk(struct buffer_chunk *chunk) 711{ 712 int i; 713 get_fs_excl(); 714 for (i = 0; i < chunk->nr; i++) { 715 submit_logged_buffer(chunk->bh[i]); 716 } 717 chunk->nr = 0; 718 put_fs_excl(); 719} 720 721static void write_ordered_chunk(struct buffer_chunk *chunk) 722{ 723 int i; 724 get_fs_excl(); 725 for (i = 0; i < chunk->nr; i++) { 726 submit_ordered_buffer(chunk->bh[i]); 727 } 728 chunk->nr = 0; 729 put_fs_excl(); 730} 731 732static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh, 733 spinlock_t * lock, void (fn) (struct buffer_chunk *)) 734{ 735 int ret = 0; 736 BUG_ON(chunk->nr >= CHUNK_SIZE); 737 chunk->bh[chunk->nr++] = bh; 738 if (chunk->nr >= CHUNK_SIZE) { 739 ret = 1; 740 if (lock) 741 spin_unlock(lock); 742 fn(chunk); 743 if (lock) 744 spin_lock(lock); 745 } 746 return ret; 747} 748 749static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0); 750static struct reiserfs_jh *alloc_jh(void) 751{ 752 struct reiserfs_jh *jh; 753 while (1) { 754 jh = kmalloc(sizeof(*jh), GFP_NOFS); 755 if (jh) { 756 atomic_inc(&nr_reiserfs_jh); 757 return jh; 758 } 759 yield(); 760 } 761} 762 763/* 764 * we want to free the jh when the buffer has been written 765 * and waited on 766 */ 767void reiserfs_free_jh(struct buffer_head *bh) 768{ 769 struct reiserfs_jh *jh; 770 771 jh = bh->b_private; 772 if (jh) { 773 bh->b_private = NULL; 774 jh->bh = NULL; 775 list_del_init(&jh->list); 776 kfree(jh); 777 if (atomic_read(&nr_reiserfs_jh) <= 0) 778 BUG(); 779 atomic_dec(&nr_reiserfs_jh); 780 put_bh(bh); 781 } 782} 783 784static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, 785 int tail) 786{ 787 struct reiserfs_jh *jh; 788 789 if (bh->b_private) { 790 spin_lock(&j->j_dirty_buffers_lock); 791 if (!bh->b_private) { 792 spin_unlock(&j->j_dirty_buffers_lock); 793 goto no_jh; 794 } 795 jh = bh->b_private; 796 list_del_init(&jh->list); 797 } else { 798 no_jh: 799 get_bh(bh); 800 jh = alloc_jh(); 801 spin_lock(&j->j_dirty_buffers_lock); 802 /* buffer must be locked for __add_jh, should be able to have 803 * two adds at the same time 804 */ 805 BUG_ON(bh->b_private); 806 jh->bh = bh; 807 bh->b_private = jh; 808 } 809 jh->jl = j->j_current_jl; 810 if (tail) 811 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list); 812 else { 813 list_add_tail(&jh->list, &jh->jl->j_bh_list); 814 } 815 spin_unlock(&j->j_dirty_buffers_lock); 816 return 0; 817} 818 819int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh) 820{ 821 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1); 822} 823int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh) 824{ 825 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0); 826} 827 828#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list) 829static int write_ordered_buffers(spinlock_t * lock, 830 struct reiserfs_journal *j, 831 struct reiserfs_journal_list *jl, 832 struct list_head *list) 833{ 834 struct buffer_head *bh; 835 struct reiserfs_jh *jh; 836 int ret = j->j_errno; 837 struct buffer_chunk chunk; 838 struct list_head tmp; 839 INIT_LIST_HEAD(&tmp); 840 841 chunk.nr = 0; 842 spin_lock(lock); 843 while (!list_empty(list)) { 844 jh = JH_ENTRY(list->next); 845 bh = jh->bh; 846 get_bh(bh); 847 if (!trylock_buffer(bh)) { 848 if (!buffer_dirty(bh)) { 849 list_move(&jh->list, &tmp); 850 goto loop_next; 851 } 852 spin_unlock(lock); 853 if (chunk.nr) 854 write_ordered_chunk(&chunk); 855 wait_on_buffer(bh); 856 cond_resched(); 857 spin_lock(lock); 858 goto loop_next; 859 } 860 /* in theory, dirty non-uptodate buffers should never get here, 861 * but the upper layer io error paths still have a few quirks. 862 * Handle them here as gracefully as we can 863 */ 864 if (!buffer_uptodate(bh) && buffer_dirty(bh)) { 865 clear_buffer_dirty(bh); 866 ret = -EIO; 867 } 868 if (buffer_dirty(bh)) { 869 list_move(&jh->list, &tmp); 870 add_to_chunk(&chunk, bh, lock, write_ordered_chunk); 871 } else { 872 reiserfs_free_jh(bh); 873 unlock_buffer(bh); 874 } 875 loop_next: 876 put_bh(bh); 877 cond_resched_lock(lock); 878 } 879 if (chunk.nr) { 880 spin_unlock(lock); 881 write_ordered_chunk(&chunk); 882 spin_lock(lock); 883 } 884 while (!list_empty(&tmp)) { 885 jh = JH_ENTRY(tmp.prev); 886 bh = jh->bh; 887 get_bh(bh); 888 reiserfs_free_jh(bh); 889 890 if (buffer_locked(bh)) { 891 spin_unlock(lock); 892 wait_on_buffer(bh); 893 spin_lock(lock); 894 } 895 if (!buffer_uptodate(bh)) { 896 ret = -EIO; 897 } 898 /* ugly interaction with invalidatepage here. 899 * reiserfs_invalidate_page will pin any buffer that has a valid 900 * journal head from an older transaction. If someone else sets 901 * our buffer dirty after we write it in the first loop, and 902 * then someone truncates the page away, nobody will ever write 903 * the buffer. We're safe if we write the page one last time 904 * after freeing the journal header. 905 */ 906 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) { 907 spin_unlock(lock); 908 ll_rw_block(WRITE, 1, &bh); 909 spin_lock(lock); 910 } 911 put_bh(bh); 912 cond_resched_lock(lock); 913 } 914 spin_unlock(lock); 915 return ret; 916} 917 918static int flush_older_commits(struct super_block *s, 919 struct reiserfs_journal_list *jl) 920{ 921 struct reiserfs_journal *journal = SB_JOURNAL(s); 922 struct reiserfs_journal_list *other_jl; 923 struct reiserfs_journal_list *first_jl; 924 struct list_head *entry; 925 unsigned int trans_id = jl->j_trans_id; 926 unsigned int other_trans_id; 927 unsigned int first_trans_id; 928 929 find_first: 930 /* 931 * first we walk backwards to find the oldest uncommitted transation 932 */ 933 first_jl = jl; 934 entry = jl->j_list.prev; 935 while (1) { 936 other_jl = JOURNAL_LIST_ENTRY(entry); 937 if (entry == &journal->j_journal_list || 938 atomic_read(&other_jl->j_older_commits_done)) 939 break; 940 941 first_jl = other_jl; 942 entry = other_jl->j_list.prev; 943 } 944 945 /* if we didn't find any older uncommitted transactions, return now */ 946 if (first_jl == jl) { 947 return 0; 948 } 949 950 first_trans_id = first_jl->j_trans_id; 951 952 entry = &first_jl->j_list; 953 while (1) { 954 other_jl = JOURNAL_LIST_ENTRY(entry); 955 other_trans_id = other_jl->j_trans_id; 956 957 if (other_trans_id < trans_id) { 958 if (atomic_read(&other_jl->j_commit_left) != 0) { 959 flush_commit_list(s, other_jl, 0); 960 961 /* list we were called with is gone, return */ 962 if (!journal_list_still_alive(s, trans_id)) 963 return 1; 964 965 /* the one we just flushed is gone, this means all 966 * older lists are also gone, so first_jl is no longer 967 * valid either. Go back to the beginning. 968 */ 969 if (!journal_list_still_alive 970 (s, other_trans_id)) { 971 goto find_first; 972 } 973 } 974 entry = entry->next; 975 if (entry == &journal->j_journal_list) 976 return 0; 977 } else { 978 return 0; 979 } 980 } 981 return 0; 982} 983 984static int reiserfs_async_progress_wait(struct super_block *s) 985{ 986 struct reiserfs_journal *j = SB_JOURNAL(s); 987 988 if (atomic_read(&j->j_async_throttle)) { 989 reiserfs_write_unlock(s); 990 congestion_wait(BLK_RW_ASYNC, HZ / 10); 991 reiserfs_write_lock(s); 992 } 993 994 return 0; 995} 996 997/* 998** if this journal list still has commit blocks unflushed, send them to disk. 999** 1000** log areas must be flushed in order (transaction 2 can't commit before transaction 1) 1001** Before the commit block can by written, every other log block must be safely on disk 1002** 1003*/ 1004static int flush_commit_list(struct super_block *s, 1005 struct reiserfs_journal_list *jl, int flushall) 1006{ 1007 int i; 1008 b_blocknr_t bn; 1009 struct buffer_head *tbh = NULL; 1010 unsigned int trans_id = jl->j_trans_id; 1011 struct reiserfs_journal *journal = SB_JOURNAL(s); 1012 int barrier = 0; 1013 int retval = 0; 1014 int write_len; 1015 1016 reiserfs_check_lock_depth(s, "flush_commit_list"); 1017 1018 if (atomic_read(&jl->j_older_commits_done)) { 1019 return 0; 1020 } 1021 1022 get_fs_excl(); 1023 1024 /* before we can put our commit blocks on disk, we have to make sure everyone older than 1025 ** us is on disk too 1026 */ 1027 BUG_ON(jl->j_len <= 0); 1028 BUG_ON(trans_id == journal->j_trans_id); 1029 1030 get_journal_list(jl); 1031 if (flushall) { 1032 if (flush_older_commits(s, jl) == 1) { 1033 /* list disappeared during flush_older_commits. return */ 1034 goto put_jl; 1035 } 1036 } 1037 1038 /* make sure nobody is trying to flush this one at the same time */ 1039 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s); 1040 1041 if (!journal_list_still_alive(s, trans_id)) { 1042 mutex_unlock(&jl->j_commit_mutex); 1043 goto put_jl; 1044 } 1045 BUG_ON(jl->j_trans_id == 0); 1046 1047 /* this commit is done, exit */ 1048 if (atomic_read(&(jl->j_commit_left)) <= 0) { 1049 if (flushall) { 1050 atomic_set(&(jl->j_older_commits_done), 1); 1051 } 1052 mutex_unlock(&jl->j_commit_mutex); 1053 goto put_jl; 1054 } 1055 1056 if (!list_empty(&jl->j_bh_list)) { 1057 int ret; 1058 1059 /* 1060 * We might sleep in numerous places inside 1061 * write_ordered_buffers. Relax the write lock. 1062 */ 1063 reiserfs_write_unlock(s); 1064 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock, 1065 journal, jl, &jl->j_bh_list); 1066 if (ret < 0 && retval == 0) 1067 retval = ret; 1068 reiserfs_write_lock(s); 1069 } 1070 BUG_ON(!list_empty(&jl->j_bh_list)); 1071 /* 1072 * for the description block and all the log blocks, submit any buffers 1073 * that haven't already reached the disk. Try to write at least 256 1074 * log blocks. later on, we will only wait on blocks that correspond 1075 * to this transaction, but while we're unplugging we might as well 1076 * get a chunk of data on there. 1077 */ 1078 atomic_inc(&journal->j_async_throttle); 1079 write_len = jl->j_len + 1; 1080 if (write_len < 256) 1081 write_len = 256; 1082 for (i = 0 ; i < write_len ; i++) { 1083 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % 1084 SB_ONDISK_JOURNAL_SIZE(s); 1085 tbh = journal_find_get_block(s, bn); 1086 if (tbh) { 1087 if (buffer_dirty(tbh)) { 1088 reiserfs_write_unlock(s); 1089 ll_rw_block(WRITE, 1, &tbh); 1090 reiserfs_write_lock(s); 1091 } 1092 put_bh(tbh) ; 1093 } 1094 } 1095 atomic_dec(&journal->j_async_throttle); 1096 1097 /* We're skipping the commit if there's an error */ 1098 if (retval || reiserfs_is_journal_aborted(journal)) 1099 barrier = 0; 1100 1101 /* wait on everything written so far before writing the commit 1102 * if we are in barrier mode, send the commit down now 1103 */ 1104 barrier = reiserfs_barrier_flush(s); 1105 if (barrier) { 1106 int ret; 1107 lock_buffer(jl->j_commit_bh); 1108 ret = submit_barrier_buffer(jl->j_commit_bh); 1109 if (ret == -EOPNOTSUPP) { 1110 set_buffer_uptodate(jl->j_commit_bh); 1111 disable_barrier(s); 1112 barrier = 0; 1113 } 1114 } 1115 for (i = 0; i < (jl->j_len + 1); i++) { 1116 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + 1117 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); 1118 tbh = journal_find_get_block(s, bn); 1119 1120 reiserfs_write_unlock(s); 1121 wait_on_buffer(tbh); 1122 reiserfs_write_lock(s); 1123 // since we're using ll_rw_blk above, it might have skipped over 1124 // a locked buffer. Double check here 1125 // 1126 /* redundant, sync_dirty_buffer() checks */ 1127 if (buffer_dirty(tbh)) { 1128 reiserfs_write_unlock(s); 1129 sync_dirty_buffer(tbh); 1130 reiserfs_write_lock(s); 1131 } 1132 if (unlikely(!buffer_uptodate(tbh))) { 1133#ifdef CONFIG_REISERFS_CHECK 1134 reiserfs_warning(s, "journal-601", 1135 "buffer write failed"); 1136#endif 1137 retval = -EIO; 1138 } 1139 put_bh(tbh); /* once for journal_find_get_block */ 1140 put_bh(tbh); /* once due to original getblk in do_journal_end */ 1141 atomic_dec(&(jl->j_commit_left)); 1142 } 1143 1144 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1); 1145 1146 if (!barrier) { 1147 /* If there was a write error in the journal - we can't commit 1148 * this transaction - it will be invalid and, if successful, 1149 * will just end up propagating the write error out to 1150 * the file system. */ 1151 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { 1152 if (buffer_dirty(jl->j_commit_bh)) 1153 BUG(); 1154 mark_buffer_dirty(jl->j_commit_bh) ; 1155 reiserfs_write_unlock(s); 1156 sync_dirty_buffer(jl->j_commit_bh) ; 1157 reiserfs_write_lock(s); 1158 } 1159 } else { 1160 reiserfs_write_unlock(s); 1161 wait_on_buffer(jl->j_commit_bh); 1162 reiserfs_write_lock(s); 1163 } 1164 1165 check_barrier_completion(s, jl->j_commit_bh); 1166 1167 /* If there was a write error in the journal - we can't commit this 1168 * transaction - it will be invalid and, if successful, will just end 1169 * up propagating the write error out to the filesystem. */ 1170 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { 1171#ifdef CONFIG_REISERFS_CHECK 1172 reiserfs_warning(s, "journal-615", "buffer write failed"); 1173#endif 1174 retval = -EIO; 1175 } 1176 bforget(jl->j_commit_bh); 1177 if (journal->j_last_commit_id != 0 && 1178 (jl->j_trans_id - journal->j_last_commit_id) != 1) { 1179 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu", 1180 journal->j_last_commit_id, jl->j_trans_id); 1181 } 1182 journal->j_last_commit_id = jl->j_trans_id; 1183 1184 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */ 1185 cleanup_freed_for_journal_list(s, jl); 1186 1187 retval = retval ? retval : journal->j_errno; 1188 1189 /* mark the metadata dirty */ 1190 if (!retval) 1191 dirty_one_transaction(s, jl); 1192 atomic_dec(&(jl->j_commit_left)); 1193 1194 if (flushall) { 1195 atomic_set(&(jl->j_older_commits_done), 1); 1196 } 1197 mutex_unlock(&jl->j_commit_mutex); 1198 put_jl: 1199 put_journal_list(s, jl); 1200 1201 if (retval) 1202 reiserfs_abort(s, retval, "Journal write error in %s", 1203 __func__); 1204 put_fs_excl(); 1205 return retval; 1206} 1207 1208/* 1209** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or 1210** returns NULL if it can't find anything 1211*/ 1212static struct reiserfs_journal_list *find_newer_jl_for_cn(struct 1213 reiserfs_journal_cnode 1214 *cn) 1215{ 1216 struct super_block *sb = cn->sb; 1217 b_blocknr_t blocknr = cn->blocknr; 1218 1219 cn = cn->hprev; 1220 while (cn) { 1221 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) { 1222 return cn->jlist; 1223 } 1224 cn = cn->hprev; 1225 } 1226 return NULL; 1227} 1228 1229static int newer_jl_done(struct reiserfs_journal_cnode *cn) 1230{ 1231 struct super_block *sb = cn->sb; 1232 b_blocknr_t blocknr = cn->blocknr; 1233 1234 cn = cn->hprev; 1235 while (cn) { 1236 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist && 1237 atomic_read(&cn->jlist->j_commit_left) != 0) 1238 return 0; 1239 cn = cn->hprev; 1240 } 1241 return 1; 1242} 1243 1244static void remove_journal_hash(struct super_block *, 1245 struct reiserfs_journal_cnode **, 1246 struct reiserfs_journal_list *, unsigned long, 1247 int); 1248 1249/* 1250** once all the real blocks have been flushed, it is safe to remove them from the 1251** journal list for this transaction. Aside from freeing the cnode, this also allows the 1252** block to be reallocated for data blocks if it had been deleted. 1253*/ 1254static void remove_all_from_journal_list(struct super_block *sb, 1255 struct reiserfs_journal_list *jl, 1256 int debug) 1257{ 1258 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1259 struct reiserfs_journal_cnode *cn, *last; 1260 cn = jl->j_realblock; 1261 1262 /* which is better, to lock once around the whole loop, or 1263 ** to lock for each call to remove_journal_hash? 1264 */ 1265 while (cn) { 1266 if (cn->blocknr != 0) { 1267 if (debug) { 1268 reiserfs_warning(sb, "reiserfs-2201", 1269 "block %u, bh is %d, state %ld", 1270 cn->blocknr, cn->bh ? 1 : 0, 1271 cn->state); 1272 } 1273 cn->state = 0; 1274 remove_journal_hash(sb, journal->j_list_hash_table, 1275 jl, cn->blocknr, 1); 1276 } 1277 last = cn; 1278 cn = cn->next; 1279 free_cnode(sb, last); 1280 } 1281 jl->j_realblock = NULL; 1282} 1283 1284/* 1285** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block. 1286** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start 1287** releasing blocks in this transaction for reuse as data blocks. 1288** called by flush_journal_list, before it calls remove_all_from_journal_list 1289** 1290*/ 1291static int _update_journal_header_block(struct super_block *sb, 1292 unsigned long offset, 1293 unsigned int trans_id) 1294{ 1295 struct reiserfs_journal_header *jh; 1296 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1297 1298 if (reiserfs_is_journal_aborted(journal)) 1299 return -EIO; 1300 1301 if (trans_id >= journal->j_last_flush_trans_id) { 1302 if (buffer_locked((journal->j_header_bh))) { 1303 reiserfs_write_unlock(sb); 1304 wait_on_buffer((journal->j_header_bh)); 1305 reiserfs_write_lock(sb); 1306 if (unlikely(!buffer_uptodate(journal->j_header_bh))) { 1307#ifdef CONFIG_REISERFS_CHECK 1308 reiserfs_warning(sb, "journal-699", 1309 "buffer write failed"); 1310#endif 1311 return -EIO; 1312 } 1313 } 1314 journal->j_last_flush_trans_id = trans_id; 1315 journal->j_first_unflushed_offset = offset; 1316 jh = (struct reiserfs_journal_header *)(journal->j_header_bh-> 1317 b_data); 1318 jh->j_last_flush_trans_id = cpu_to_le32(trans_id); 1319 jh->j_first_unflushed_offset = cpu_to_le32(offset); 1320 jh->j_mount_id = cpu_to_le32(journal->j_mount_id); 1321 1322 if (reiserfs_barrier_flush(sb)) { 1323 int ret; 1324 lock_buffer(journal->j_header_bh); 1325 ret = submit_barrier_buffer(journal->j_header_bh); 1326 if (ret == -EOPNOTSUPP) { 1327 set_buffer_uptodate(journal->j_header_bh); 1328 disable_barrier(sb); 1329 goto sync; 1330 } 1331 reiserfs_write_unlock(sb); 1332 wait_on_buffer(journal->j_header_bh); 1333 reiserfs_write_lock(sb); 1334 check_barrier_completion(sb, journal->j_header_bh); 1335 } else { 1336 sync: 1337 set_buffer_dirty(journal->j_header_bh); 1338 reiserfs_write_unlock(sb); 1339 sync_dirty_buffer(journal->j_header_bh); 1340 reiserfs_write_lock(sb); 1341 } 1342 if (!buffer_uptodate(journal->j_header_bh)) { 1343 reiserfs_warning(sb, "journal-837", 1344 "IO error during journal replay"); 1345 return -EIO; 1346 } 1347 } 1348 return 0; 1349} 1350 1351static int update_journal_header_block(struct super_block *sb, 1352 unsigned long offset, 1353 unsigned int trans_id) 1354{ 1355 return _update_journal_header_block(sb, offset, trans_id); 1356} 1357 1358/* 1359** flush any and all journal lists older than you are 1360** can only be called from flush_journal_list 1361*/ 1362static int flush_older_journal_lists(struct super_block *sb, 1363 struct reiserfs_journal_list *jl) 1364{ 1365 struct list_head *entry; 1366 struct reiserfs_journal_list *other_jl; 1367 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1368 unsigned int trans_id = jl->j_trans_id; 1369 1370 /* we know we are the only ones flushing things, no extra race 1371 * protection is required. 1372 */ 1373 restart: 1374 entry = journal->j_journal_list.next; 1375 /* Did we wrap? */ 1376 if (entry == &journal->j_journal_list) 1377 return 0; 1378 other_jl = JOURNAL_LIST_ENTRY(entry); 1379 if (other_jl->j_trans_id < trans_id) { 1380 BUG_ON(other_jl->j_refcount <= 0); 1381 /* do not flush all */ 1382 flush_journal_list(sb, other_jl, 0); 1383 1384 /* other_jl is now deleted from the list */ 1385 goto restart; 1386 } 1387 return 0; 1388} 1389 1390static void del_from_work_list(struct super_block *s, 1391 struct reiserfs_journal_list *jl) 1392{ 1393 struct reiserfs_journal *journal = SB_JOURNAL(s); 1394 if (!list_empty(&jl->j_working_list)) { 1395 list_del_init(&jl->j_working_list); 1396 journal->j_num_work_lists--; 1397 } 1398} 1399 1400/* flush a journal list, both commit and real blocks 1401** 1402** always set flushall to 1, unless you are calling from inside 1403** flush_journal_list 1404** 1405** IMPORTANT. This can only be called while there are no journal writers, 1406** and the journal is locked. That means it can only be called from 1407** do_journal_end, or by journal_release 1408*/ 1409static int flush_journal_list(struct super_block *s, 1410 struct reiserfs_journal_list *jl, int flushall) 1411{ 1412 struct reiserfs_journal_list *pjl; 1413 struct reiserfs_journal_cnode *cn, *last; 1414 int count; 1415 int was_jwait = 0; 1416 int was_dirty = 0; 1417 struct buffer_head *saved_bh; 1418 unsigned long j_len_saved = jl->j_len; 1419 struct reiserfs_journal *journal = SB_JOURNAL(s); 1420 int err = 0; 1421 1422 BUG_ON(j_len_saved <= 0); 1423 1424 if (atomic_read(&journal->j_wcount) != 0) { 1425 reiserfs_warning(s, "clm-2048", "called with wcount %d", 1426 atomic_read(&journal->j_wcount)); 1427 } 1428 BUG_ON(jl->j_trans_id == 0); 1429 1430 /* if flushall == 0, the lock is already held */ 1431 if (flushall) { 1432 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); 1433 } else if (mutex_trylock(&journal->j_flush_mutex)) { 1434 BUG(); 1435 } 1436 1437 count = 0; 1438 if (j_len_saved > journal->j_trans_max) { 1439 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu", 1440 j_len_saved, jl->j_trans_id); 1441 return 0; 1442 } 1443 1444 get_fs_excl(); 1445 1446 /* if all the work is already done, get out of here */ 1447 if (atomic_read(&(jl->j_nonzerolen)) <= 0 && 1448 atomic_read(&(jl->j_commit_left)) <= 0) { 1449 goto flush_older_and_return; 1450 } 1451 1452 /* start by putting the commit list on disk. This will also flush 1453 ** the commit lists of any olders transactions 1454 */ 1455 flush_commit_list(s, jl, 1); 1456 1457 if (!(jl->j_state & LIST_DIRTY) 1458 && !reiserfs_is_journal_aborted(journal)) 1459 BUG(); 1460 1461 /* are we done now? */ 1462 if (atomic_read(&(jl->j_nonzerolen)) <= 0 && 1463 atomic_read(&(jl->j_commit_left)) <= 0) { 1464 goto flush_older_and_return; 1465 } 1466 1467 /* loop through each cnode, see if we need to write it, 1468 ** or wait on a more recent transaction, or just ignore it 1469 */ 1470 if (atomic_read(&(journal->j_wcount)) != 0) { 1471 reiserfs_panic(s, "journal-844", "journal list is flushing, " 1472 "wcount is not 0"); 1473 } 1474 cn = jl->j_realblock; 1475 while (cn) { 1476 was_jwait = 0; 1477 was_dirty = 0; 1478 saved_bh = NULL; 1479 /* blocknr of 0 is no longer in the hash, ignore it */ 1480 if (cn->blocknr == 0) { 1481 goto free_cnode; 1482 } 1483 1484 /* This transaction failed commit. Don't write out to the disk */ 1485 if (!(jl->j_state & LIST_DIRTY)) 1486 goto free_cnode; 1487 1488 pjl = find_newer_jl_for_cn(cn); 1489 /* the order is important here. We check pjl to make sure we 1490 ** don't clear BH_JDirty_wait if we aren't the one writing this 1491 ** block to disk 1492 */ 1493 if (!pjl && cn->bh) { 1494 saved_bh = cn->bh; 1495 1496 /* we do this to make sure nobody releases the buffer while 1497 ** we are working with it 1498 */ 1499 get_bh(saved_bh); 1500 1501 if (buffer_journal_dirty(saved_bh)) { 1502 BUG_ON(!can_dirty(cn)); 1503 was_jwait = 1; 1504 was_dirty = 1; 1505 } else if (can_dirty(cn)) { 1506 /* everything with !pjl && jwait should be writable */ 1507 BUG(); 1508 } 1509 } 1510 1511 /* if someone has this block in a newer transaction, just make 1512 ** sure they are committed, and don't try writing it to disk 1513 */ 1514 if (pjl) { 1515 if (atomic_read(&pjl->j_commit_left)) 1516 flush_commit_list(s, pjl, 1); 1517 goto free_cnode; 1518 } 1519 1520 /* bh == NULL when the block got to disk on its own, OR, 1521 ** the block got freed in a future transaction 1522 */ 1523 if (saved_bh == NULL) { 1524 goto free_cnode; 1525 } 1526 1527 /* this should never happen. kupdate_one_transaction has this list 1528 ** locked while it works, so we should never see a buffer here that 1529 ** is not marked JDirty_wait 1530 */ 1531 if ((!was_jwait) && !buffer_locked(saved_bh)) { 1532 reiserfs_warning(s, "journal-813", 1533 "BAD! buffer %llu %cdirty %cjwait, " 1534 "not in a newer tranasction", 1535 (unsigned long long)saved_bh-> 1536 b_blocknr, was_dirty ? ' ' : '!', 1537 was_jwait ? ' ' : '!'); 1538 } 1539 if (was_dirty) { 1540 /* we inc again because saved_bh gets decremented at free_cnode */ 1541 get_bh(saved_bh); 1542 set_bit(BLOCK_NEEDS_FLUSH, &cn->state); 1543 lock_buffer(saved_bh); 1544 BUG_ON(cn->blocknr != saved_bh->b_blocknr); 1545 if (buffer_dirty(saved_bh)) 1546 submit_logged_buffer(saved_bh); 1547 else 1548 unlock_buffer(saved_bh); 1549 count++; 1550 } else { 1551 reiserfs_warning(s, "clm-2082", 1552 "Unable to flush buffer %llu in %s", 1553 (unsigned long long)saved_bh-> 1554 b_blocknr, __func__); 1555 } 1556 free_cnode: 1557 last = cn; 1558 cn = cn->next; 1559 if (saved_bh) { 1560 /* we incremented this to keep others from taking the buffer head away */ 1561 put_bh(saved_bh); 1562 if (atomic_read(&(saved_bh->b_count)) < 0) { 1563 reiserfs_warning(s, "journal-945", 1564 "saved_bh->b_count < 0"); 1565 } 1566 } 1567 } 1568 if (count > 0) { 1569 cn = jl->j_realblock; 1570 while (cn) { 1571 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { 1572 if (!cn->bh) { 1573 reiserfs_panic(s, "journal-1011", 1574 "cn->bh is NULL"); 1575 } 1576 1577 reiserfs_write_unlock(s); 1578 wait_on_buffer(cn->bh); 1579 reiserfs_write_lock(s); 1580 1581 if (!cn->bh) { 1582 reiserfs_panic(s, "journal-1012", 1583 "cn->bh is NULL"); 1584 } 1585 if (unlikely(!buffer_uptodate(cn->bh))) { 1586#ifdef CONFIG_REISERFS_CHECK 1587 reiserfs_warning(s, "journal-949", 1588 "buffer write failed"); 1589#endif 1590 err = -EIO; 1591 } 1592 /* note, we must clear the JDirty_wait bit after the up to date 1593 ** check, otherwise we race against our flushpage routine 1594 */ 1595 BUG_ON(!test_clear_buffer_journal_dirty 1596 (cn->bh)); 1597 1598 /* drop one ref for us */ 1599 put_bh(cn->bh); 1600 /* drop one ref for journal_mark_dirty */ 1601 release_buffer_page(cn->bh); 1602 } 1603 cn = cn->next; 1604 } 1605 } 1606 1607 if (err) 1608 reiserfs_abort(s, -EIO, 1609 "Write error while pushing transaction to disk in %s", 1610 __func__); 1611 flush_older_and_return: 1612 1613 /* before we can update the journal header block, we _must_ flush all 1614 ** real blocks from all older transactions to disk. This is because 1615 ** once the header block is updated, this transaction will not be 1616 ** replayed after a crash 1617 */ 1618 if (flushall) { 1619 flush_older_journal_lists(s, jl); 1620 } 1621 1622 err = journal->j_errno; 1623 /* before we can remove everything from the hash tables for this 1624 ** transaction, we must make sure it can never be replayed 1625 ** 1626 ** since we are only called from do_journal_end, we know for sure there 1627 ** are no allocations going on while we are flushing journal lists. So, 1628 ** we only need to update the journal header block for the last list 1629 ** being flushed 1630 */ 1631 if (!err && flushall) { 1632 err = 1633 update_journal_header_block(s, 1634 (jl->j_start + jl->j_len + 1635 2) % SB_ONDISK_JOURNAL_SIZE(s), 1636 jl->j_trans_id); 1637 if (err) 1638 reiserfs_abort(s, -EIO, 1639 "Write error while updating journal header in %s", 1640 __func__); 1641 } 1642 remove_all_from_journal_list(s, jl, 0); 1643 list_del_init(&jl->j_list); 1644 journal->j_num_lists--; 1645 del_from_work_list(s, jl); 1646 1647 if (journal->j_last_flush_id != 0 && 1648 (jl->j_trans_id - journal->j_last_flush_id) != 1) { 1649 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu", 1650 journal->j_last_flush_id, jl->j_trans_id); 1651 } 1652 journal->j_last_flush_id = jl->j_trans_id; 1653 1654 /* not strictly required since we are freeing the list, but it should 1655 * help find code using dead lists later on 1656 */ 1657 jl->j_len = 0; 1658 atomic_set(&(jl->j_nonzerolen), 0); 1659 jl->j_start = 0; 1660 jl->j_realblock = NULL; 1661 jl->j_commit_bh = NULL; 1662 jl->j_trans_id = 0; 1663 jl->j_state = 0; 1664 put_journal_list(s, jl); 1665 if (flushall) 1666 mutex_unlock(&journal->j_flush_mutex); 1667 put_fs_excl(); 1668 return err; 1669} 1670 1671static int test_transaction(struct super_block *s, 1672 struct reiserfs_journal_list *jl) 1673{ 1674 struct reiserfs_journal_cnode *cn; 1675 1676 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) 1677 return 1; 1678 1679 cn = jl->j_realblock; 1680 while (cn) { 1681 /* if the blocknr == 0, this has been cleared from the hash, 1682 ** skip it 1683 */ 1684 if (cn->blocknr == 0) { 1685 goto next; 1686 } 1687 if (cn->bh && !newer_jl_done(cn)) 1688 return 0; 1689 next: 1690 cn = cn->next; 1691 cond_resched(); 1692 } 1693 return 0; 1694} 1695 1696static int write_one_transaction(struct super_block *s, 1697 struct reiserfs_journal_list *jl, 1698 struct buffer_chunk *chunk) 1699{ 1700 struct reiserfs_journal_cnode *cn; 1701 int ret = 0; 1702 1703 jl->j_state |= LIST_TOUCHED; 1704 del_from_work_list(s, jl); 1705 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) { 1706 return 0; 1707 } 1708 1709 cn = jl->j_realblock; 1710 while (cn) { 1711 /* if the blocknr == 0, this has been cleared from the hash, 1712 ** skip it 1713 */ 1714 if (cn->blocknr == 0) { 1715 goto next; 1716 } 1717 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { 1718 struct buffer_head *tmp_bh; 1719 /* we can race against journal_mark_freed when we try 1720 * to lock_buffer(cn->bh), so we have to inc the buffer 1721 * count, and recheck things after locking 1722 */ 1723 tmp_bh = cn->bh; 1724 get_bh(tmp_bh); 1725 lock_buffer(tmp_bh); 1726 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) { 1727 if (!buffer_journal_dirty(tmp_bh) || 1728 buffer_journal_prepared(tmp_bh)) 1729 BUG(); 1730 add_to_chunk(chunk, tmp_bh, NULL, write_chunk); 1731 ret++; 1732 } else { 1733 /* note, cn->bh might be null now */ 1734 unlock_buffer(tmp_bh); 1735 } 1736 put_bh(tmp_bh); 1737 } 1738 next: 1739 cn = cn->next; 1740 cond_resched(); 1741 } 1742 return ret; 1743} 1744 1745/* used by flush_commit_list */ 1746static int dirty_one_transaction(struct super_block *s, 1747 struct reiserfs_journal_list *jl) 1748{ 1749 struct reiserfs_journal_cnode *cn; 1750 struct reiserfs_journal_list *pjl; 1751 int ret = 0; 1752 1753 jl->j_state |= LIST_DIRTY; 1754 cn = jl->j_realblock; 1755 while (cn) { 1756 /* look for a more recent transaction that logged this 1757 ** buffer. Only the most recent transaction with a buffer in 1758 ** it is allowed to send that buffer to disk 1759 */ 1760 pjl = find_newer_jl_for_cn(cn); 1761 if (!pjl && cn->blocknr && cn->bh 1762 && buffer_journal_dirty(cn->bh)) { 1763 BUG_ON(!can_dirty(cn)); 1764 /* if the buffer is prepared, it will either be logged 1765 * or restored. If restored, we need to make sure 1766 * it actually gets marked dirty 1767 */ 1768 clear_buffer_journal_new(cn->bh); 1769 if (buffer_journal_prepared(cn->bh)) { 1770 set_buffer_journal_restore_dirty(cn->bh); 1771 } else { 1772 set_buffer_journal_test(cn->bh); 1773 mark_buffer_dirty(cn->bh); 1774 } 1775 } 1776 cn = cn->next; 1777 } 1778 return ret; 1779} 1780 1781static int kupdate_transactions(struct super_block *s, 1782 struct reiserfs_journal_list *jl, 1783 struct reiserfs_journal_list **next_jl, 1784 unsigned int *next_trans_id, 1785 int num_blocks, int num_trans) 1786{ 1787 int ret = 0; 1788 int written = 0; 1789 int transactions_flushed = 0; 1790 unsigned int orig_trans_id = jl->j_trans_id; 1791 struct buffer_chunk chunk; 1792 struct list_head *entry; 1793 struct reiserfs_journal *journal = SB_JOURNAL(s); 1794 chunk.nr = 0; 1795 1796 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); 1797 if (!journal_list_still_alive(s, orig_trans_id)) { 1798 goto done; 1799 } 1800 1801 /* we've got j_flush_mutex held, nobody is going to delete any 1802 * of these lists out from underneath us 1803 */ 1804 while ((num_trans && transactions_flushed < num_trans) || 1805 (!num_trans && written < num_blocks)) { 1806 1807 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) || 1808 atomic_read(&jl->j_commit_left) 1809 || !(jl->j_state & LIST_DIRTY)) { 1810 del_from_work_list(s, jl); 1811 break; 1812 } 1813 ret = write_one_transaction(s, jl, &chunk); 1814 1815 if (ret < 0) 1816 goto done; 1817 transactions_flushed++; 1818 written += ret; 1819 entry = jl->j_list.next; 1820 1821 /* did we wrap? */ 1822 if (entry == &journal->j_journal_list) { 1823 break; 1824 } 1825 jl = JOURNAL_LIST_ENTRY(entry); 1826 1827 /* don't bother with older transactions */ 1828 if (jl->j_trans_id <= orig_trans_id) 1829 break; 1830 } 1831 if (chunk.nr) { 1832 write_chunk(&chunk); 1833 } 1834 1835 done: 1836 mutex_unlock(&journal->j_flush_mutex); 1837 return ret; 1838} 1839 1840/* for o_sync and fsync heavy applications, they tend to use 1841** all the journa list slots with tiny transactions. These 1842** trigger lots and lots of calls to update the header block, which 1843** adds seeks and slows things down. 1844** 1845** This function tries to clear out a large chunk of the journal lists 1846** at once, which makes everything faster since only the newest journal 1847** list updates the header block 1848*/ 1849static int flush_used_journal_lists(struct super_block *s, 1850 struct reiserfs_journal_list *jl) 1851{ 1852 unsigned long len = 0; 1853 unsigned long cur_len; 1854 int ret; 1855 int i; 1856 int limit = 256; 1857 struct reiserfs_journal_list *tjl; 1858 struct reiserfs_journal_list *flush_jl; 1859 unsigned int trans_id; 1860 struct reiserfs_journal *journal = SB_JOURNAL(s); 1861 1862 flush_jl = tjl = jl; 1863 1864 /* in data logging mode, try harder to flush a lot of blocks */ 1865 if (reiserfs_data_log(s)) 1866 limit = 1024; 1867 /* flush for 256 transactions or limit blocks, whichever comes first */ 1868 for (i = 0; i < 256 && len < limit; i++) { 1869 if (atomic_read(&tjl->j_commit_left) || 1870 tjl->j_trans_id < jl->j_trans_id) { 1871 break; 1872 } 1873 cur_len = atomic_read(&tjl->j_nonzerolen); 1874 if (cur_len > 0) { 1875 tjl->j_state &= ~LIST_TOUCHED; 1876 } 1877 len += cur_len; 1878 flush_jl = tjl; 1879 if (tjl->j_list.next == &journal->j_journal_list) 1880 break; 1881 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next); 1882 } 1883 /* try to find a group of blocks we can flush across all the 1884 ** transactions, but only bother if we've actually spanned 1885 ** across multiple lists 1886 */ 1887 if (flush_jl != jl) { 1888 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i); 1889 } 1890 flush_journal_list(s, flush_jl, 1); 1891 return 0; 1892} 1893 1894/* 1895** removes any nodes in table with name block and dev as bh. 1896** only touchs the hnext and hprev pointers. 1897*/ 1898void remove_journal_hash(struct super_block *sb, 1899 struct reiserfs_journal_cnode **table, 1900 struct reiserfs_journal_list *jl, 1901 unsigned long block, int remove_freed) 1902{ 1903 struct reiserfs_journal_cnode *cur; 1904 struct reiserfs_journal_cnode **head; 1905 1906 head = &(journal_hash(table, sb, block)); 1907 if (!head) { 1908 return; 1909 } 1910 cur = *head; 1911 while (cur) { 1912 if (cur->blocknr == block && cur->sb == sb 1913 && (jl == NULL || jl == cur->jlist) 1914 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) { 1915 if (cur->hnext) { 1916 cur->hnext->hprev = cur->hprev; 1917 } 1918 if (cur->hprev) { 1919 cur->hprev->hnext = cur->hnext; 1920 } else { 1921 *head = cur->hnext; 1922 } 1923 cur->blocknr = 0; 1924 cur->sb = NULL; 1925 cur->state = 0; 1926 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */ 1927 atomic_dec(&(cur->jlist->j_nonzerolen)); 1928 cur->bh = NULL; 1929 cur->jlist = NULL; 1930 } 1931 cur = cur->hnext; 1932 } 1933} 1934 1935static void free_journal_ram(struct super_block *sb) 1936{ 1937 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1938 kfree(journal->j_current_jl); 1939 journal->j_num_lists--; 1940 1941 vfree(journal->j_cnode_free_orig); 1942 free_list_bitmaps(sb, journal->j_list_bitmap); 1943 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */ 1944 if (journal->j_header_bh) { 1945 brelse(journal->j_header_bh); 1946 } 1947 /* j_header_bh is on the journal dev, make sure not to release the journal 1948 * dev until we brelse j_header_bh 1949 */ 1950 release_journal_dev(sb, journal); 1951 vfree(journal); 1952} 1953 1954/* 1955** call on unmount. Only set error to 1 if you haven't made your way out 1956** of read_super() yet. Any other caller must keep error at 0. 1957*/ 1958static int do_journal_release(struct reiserfs_transaction_handle *th, 1959 struct super_block *sb, int error) 1960{ 1961 struct reiserfs_transaction_handle myth; 1962 int flushed = 0; 1963 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1964 1965 /* we only want to flush out transactions if we were called with error == 0 1966 */ 1967 if (!error && !(sb->s_flags & MS_RDONLY)) { 1968 /* end the current trans */ 1969 BUG_ON(!th->t_trans_id); 1970 do_journal_end(th, sb, 10, FLUSH_ALL); 1971 1972 /* make sure something gets logged to force our way into the flush code */ 1973 if (!journal_join(&myth, sb, 1)) { 1974 reiserfs_prepare_for_journal(sb, 1975 SB_BUFFER_WITH_SB(sb), 1976 1); 1977 journal_mark_dirty(&myth, sb, 1978 SB_BUFFER_WITH_SB(sb)); 1979 do_journal_end(&myth, sb, 1, FLUSH_ALL); 1980 flushed = 1; 1981 } 1982 } 1983 1984 /* this also catches errors during the do_journal_end above */ 1985 if (!error && reiserfs_is_journal_aborted(journal)) { 1986 memset(&myth, 0, sizeof(myth)); 1987 if (!journal_join_abort(&myth, sb, 1)) { 1988 reiserfs_prepare_for_journal(sb, 1989 SB_BUFFER_WITH_SB(sb), 1990 1); 1991 journal_mark_dirty(&myth, sb, 1992 SB_BUFFER_WITH_SB(sb)); 1993 do_journal_end(&myth, sb, 1, FLUSH_ALL); 1994 } 1995 } 1996 1997 reiserfs_mounted_fs_count--; 1998 /* wait for all commits to finish */ 1999 cancel_delayed_work(&SB_JOURNAL(sb)->j_work); 2000 2001 /* 2002 * We must release the write lock here because 2003 * the workqueue job (flush_async_commit) needs this lock 2004 */ 2005 reiserfs_write_unlock(sb); 2006 flush_workqueue(commit_wq); 2007 2008 if (!reiserfs_mounted_fs_count) { 2009 destroy_workqueue(commit_wq); 2010 commit_wq = NULL; 2011 } 2012 2013 free_journal_ram(sb); 2014 2015 reiserfs_write_lock(sb); 2016 2017 return 0; 2018} 2019 2020/* 2021** call on unmount. flush all journal trans, release all alloc'd ram 2022*/ 2023int journal_release(struct reiserfs_transaction_handle *th, 2024 struct super_block *sb) 2025{ 2026 return do_journal_release(th, sb, 0); 2027} 2028 2029/* 2030** only call from an error condition inside reiserfs_read_super! 2031*/ 2032int journal_release_error(struct reiserfs_transaction_handle *th, 2033 struct super_block *sb) 2034{ 2035 return do_journal_release(th, sb, 1); 2036} 2037 2038/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */ 2039static int journal_compare_desc_commit(struct super_block *sb, 2040 struct reiserfs_journal_desc *desc, 2041 struct reiserfs_journal_commit *commit) 2042{ 2043 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) || 2044 get_commit_trans_len(commit) != get_desc_trans_len(desc) || 2045 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max || 2046 get_commit_trans_len(commit) <= 0) { 2047 return 1; 2048 } 2049 return 0; 2050} 2051 2052/* returns 0 if it did not find a description block 2053** returns -1 if it found a corrupt commit block 2054** returns 1 if both desc and commit were valid 2055*/ 2056static int journal_transaction_is_valid(struct super_block *sb, 2057 struct buffer_head *d_bh, 2058 unsigned int *oldest_invalid_trans_id, 2059 unsigned long *newest_mount_id) 2060{ 2061 struct reiserfs_journal_desc *desc; 2062 struct reiserfs_journal_commit *commit; 2063 struct buffer_head *c_bh; 2064 unsigned long offset; 2065 2066 if (!d_bh) 2067 return 0; 2068 2069 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2070 if (get_desc_trans_len(desc) > 0 2071 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) { 2072 if (oldest_invalid_trans_id && *oldest_invalid_trans_id 2073 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) { 2074 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2075 "journal-986: transaction " 2076 "is valid returning because trans_id %d is greater than " 2077 "oldest_invalid %lu", 2078 get_desc_trans_id(desc), 2079 *oldest_invalid_trans_id); 2080 return 0; 2081 } 2082 if (newest_mount_id 2083 && *newest_mount_id > get_desc_mount_id(desc)) { 2084 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2085 "journal-1087: transaction " 2086 "is valid returning because mount_id %d is less than " 2087 "newest_mount_id %lu", 2088 get_desc_mount_id(desc), 2089 *newest_mount_id); 2090 return -1; 2091 } 2092 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) { 2093 reiserfs_warning(sb, "journal-2018", 2094 "Bad transaction length %d " 2095 "encountered, ignoring transaction", 2096 get_desc_trans_len(desc)); 2097 return -1; 2098 } 2099 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2100 2101 /* ok, we have a journal description block, lets see if the transaction was valid */ 2102 c_bh = 2103 journal_bread(sb, 2104 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2105 ((offset + get_desc_trans_len(desc) + 2106 1) % SB_ONDISK_JOURNAL_SIZE(sb))); 2107 if (!c_bh) 2108 return 0; 2109 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 2110 if (journal_compare_desc_commit(sb, desc, commit)) { 2111 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2112 "journal_transaction_is_valid, commit offset %ld had bad " 2113 "time %d or length %d", 2114 c_bh->b_blocknr - 2115 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2116 get_commit_trans_id(commit), 2117 get_commit_trans_len(commit)); 2118 brelse(c_bh); 2119 if (oldest_invalid_trans_id) { 2120 *oldest_invalid_trans_id = 2121 get_desc_trans_id(desc); 2122 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2123 "journal-1004: " 2124 "transaction_is_valid setting oldest invalid trans_id " 2125 "to %d", 2126 get_desc_trans_id(desc)); 2127 } 2128 return -1; 2129 } 2130 brelse(c_bh); 2131 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2132 "journal-1006: found valid " 2133 "transaction start offset %llu, len %d id %d", 2134 d_bh->b_blocknr - 2135 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2136 get_desc_trans_len(desc), 2137 get_desc_trans_id(desc)); 2138 return 1; 2139 } else { 2140 return 0; 2141 } 2142} 2143 2144static void brelse_array(struct buffer_head **heads, int num) 2145{ 2146 int i; 2147 for (i = 0; i < num; i++) { 2148 brelse(heads[i]); 2149 } 2150} 2151 2152/* 2153** given the start, and values for the oldest acceptable transactions, 2154** this either reads in a replays a transaction, or returns because the transaction 2155** is invalid, or too old. 2156*/ 2157static int journal_read_transaction(struct super_block *sb, 2158 unsigned long cur_dblock, 2159 unsigned long oldest_start, 2160 unsigned int oldest_trans_id, 2161 unsigned long newest_mount_id) 2162{ 2163 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2164 struct reiserfs_journal_desc *desc; 2165 struct reiserfs_journal_commit *commit; 2166 unsigned int trans_id = 0; 2167 struct buffer_head *c_bh; 2168 struct buffer_head *d_bh; 2169 struct buffer_head **log_blocks = NULL; 2170 struct buffer_head **real_blocks = NULL; 2171 unsigned int trans_offset; 2172 int i; 2173 int trans_half; 2174 2175 d_bh = journal_bread(sb, cur_dblock); 2176 if (!d_bh) 2177 return 1; 2178 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2179 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2180 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: " 2181 "journal_read_transaction, offset %llu, len %d mount_id %d", 2182 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2183 get_desc_trans_len(desc), get_desc_mount_id(desc)); 2184 if (get_desc_trans_id(desc) < oldest_trans_id) { 2185 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: " 2186 "journal_read_trans skipping because %lu is too old", 2187 cur_dblock - 2188 SB_ONDISK_JOURNAL_1st_BLOCK(sb)); 2189 brelse(d_bh); 2190 return 1; 2191 } 2192 if (get_desc_mount_id(desc) != newest_mount_id) { 2193 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: " 2194 "journal_read_trans skipping because %d is != " 2195 "newest_mount_id %lu", get_desc_mount_id(desc), 2196 newest_mount_id); 2197 brelse(d_bh); 2198 return 1; 2199 } 2200 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2201 ((trans_offset + get_desc_trans_len(desc) + 1) % 2202 SB_ONDISK_JOURNAL_SIZE(sb))); 2203 if (!c_bh) { 2204 brelse(d_bh); 2205 return 1; 2206 } 2207 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 2208 if (journal_compare_desc_commit(sb, desc, commit)) { 2209 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2210 "journal_read_transaction, " 2211 "commit offset %llu had bad time %d or length %d", 2212 c_bh->b_blocknr - 2213 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2214 get_commit_trans_id(commit), 2215 get_commit_trans_len(commit)); 2216 brelse(c_bh); 2217 brelse(d_bh); 2218 return 1; 2219 } 2220 2221 if (bdev_read_only(sb->s_bdev)) { 2222 reiserfs_warning(sb, "clm-2076", 2223 "device is readonly, unable to replay log"); 2224 brelse(c_bh); 2225 brelse(d_bh); 2226 return -EROFS; 2227 } 2228 2229 trans_id = get_desc_trans_id(desc); 2230 /* now we know we've got a good transaction, and it was inside the valid time ranges */ 2231 log_blocks = kmalloc(get_desc_trans_len(desc) * 2232 sizeof(struct buffer_head *), GFP_NOFS); 2233 real_blocks = kmalloc(get_desc_trans_len(desc) * 2234 sizeof(struct buffer_head *), GFP_NOFS); 2235 if (!log_blocks || !real_blocks) { 2236 brelse(c_bh); 2237 brelse(d_bh); 2238 kfree(log_blocks); 2239 kfree(real_blocks); 2240 reiserfs_warning(sb, "journal-1169", 2241 "kmalloc failed, unable to mount FS"); 2242 return -1; 2243 } 2244 /* get all the buffer heads */ 2245 trans_half = journal_trans_half(sb->s_blocksize); 2246 for (i = 0; i < get_desc_trans_len(desc); i++) { 2247 log_blocks[i] = 2248 journal_getblk(sb, 2249 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2250 (trans_offset + 1 + 2251 i) % SB_ONDISK_JOURNAL_SIZE(sb)); 2252 if (i < trans_half) { 2253 real_blocks[i] = 2254 sb_getblk(sb, 2255 le32_to_cpu(desc->j_realblock[i])); 2256 } else { 2257 real_blocks[i] = 2258 sb_getblk(sb, 2259 le32_to_cpu(commit-> 2260 j_realblock[i - trans_half])); 2261 } 2262 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) { 2263 reiserfs_warning(sb, "journal-1207", 2264 "REPLAY FAILURE fsck required! " 2265 "Block to replay is outside of " 2266 "filesystem"); 2267 goto abort_replay; 2268 } 2269 /* make sure we don't try to replay onto log or reserved area */ 2270 if (is_block_in_log_or_reserved_area 2271 (sb, real_blocks[i]->b_blocknr)) { 2272 reiserfs_warning(sb, "journal-1204", 2273 "REPLAY FAILURE fsck required! " 2274 "Trying to replay onto a log block"); 2275 abort_replay: 2276 brelse_array(log_blocks, i); 2277 brelse_array(real_blocks, i); 2278 brelse(c_bh); 2279 brelse(d_bh); 2280 kfree(log_blocks); 2281 kfree(real_blocks); 2282 return -1; 2283 } 2284 } 2285 /* read in the log blocks, memcpy to the corresponding real block */ 2286 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks); 2287 for (i = 0; i < get_desc_trans_len(desc); i++) { 2288 2289 reiserfs_write_unlock(sb); 2290 wait_on_buffer(log_blocks[i]); 2291 reiserfs_write_lock(sb); 2292 2293 if (!buffer_uptodate(log_blocks[i])) { 2294 reiserfs_warning(sb, "journal-1212", 2295 "REPLAY FAILURE fsck required! " 2296 "buffer write failed"); 2297 brelse_array(log_blocks + i, 2298 get_desc_trans_len(desc) - i); 2299 brelse_array(real_blocks, get_desc_trans_len(desc)); 2300 brelse(c_bh); 2301 brelse(d_bh); 2302 kfree(log_blocks); 2303 kfree(real_blocks); 2304 return -1; 2305 } 2306 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, 2307 real_blocks[i]->b_size); 2308 set_buffer_uptodate(real_blocks[i]); 2309 brelse(log_blocks[i]); 2310 } 2311 /* flush out the real blocks */ 2312 for (i = 0; i < get_desc_trans_len(desc); i++) { 2313 set_buffer_dirty(real_blocks[i]); 2314 write_dirty_buffer(real_blocks[i], WRITE); 2315 } 2316 for (i = 0; i < get_desc_trans_len(desc); i++) { 2317 wait_on_buffer(real_blocks[i]); 2318 if (!buffer_uptodate(real_blocks[i])) { 2319 reiserfs_warning(sb, "journal-1226", 2320 "REPLAY FAILURE, fsck required! " 2321 "buffer write failed"); 2322 brelse_array(real_blocks + i, 2323 get_desc_trans_len(desc) - i); 2324 brelse(c_bh); 2325 brelse(d_bh); 2326 kfree(log_blocks); 2327 kfree(real_blocks); 2328 return -1; 2329 } 2330 brelse(real_blocks[i]); 2331 } 2332 cur_dblock = 2333 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2334 ((trans_offset + get_desc_trans_len(desc) + 2335 2) % SB_ONDISK_JOURNAL_SIZE(sb)); 2336 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2337 "journal-1095: setting journal " "start to offset %ld", 2338 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); 2339 2340 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */ 2341 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2342 journal->j_last_flush_trans_id = trans_id; 2343 journal->j_trans_id = trans_id + 1; 2344 /* check for trans_id overflow */ 2345 if (journal->j_trans_id == 0) 2346 journal->j_trans_id = 10; 2347 brelse(c_bh); 2348 brelse(d_bh); 2349 kfree(log_blocks); 2350 kfree(real_blocks); 2351 return 0; 2352} 2353 2354/* This function reads blocks starting from block and to max_block of bufsize 2355 size (but no more than BUFNR blocks at a time). This proved to improve 2356 mounting speed on self-rebuilding raid5 arrays at least. 2357 Right now it is only used from journal code. But later we might use it 2358 from other places. 2359 Note: Do not use journal_getblk/sb_getblk functions here! */ 2360static struct buffer_head *reiserfs_breada(struct block_device *dev, 2361 b_blocknr_t block, int bufsize, 2362 b_blocknr_t max_block) 2363{ 2364 struct buffer_head *bhlist[BUFNR]; 2365 unsigned int blocks = BUFNR; 2366 struct buffer_head *bh; 2367 int i, j; 2368 2369 bh = __getblk(dev, block, bufsize); 2370 if (buffer_uptodate(bh)) 2371 return (bh); 2372 2373 if (block + BUFNR > max_block) { 2374 blocks = max_block - block; 2375 } 2376 bhlist[0] = bh; 2377 j = 1; 2378 for (i = 1; i < blocks; i++) { 2379 bh = __getblk(dev, block + i, bufsize); 2380 if (buffer_uptodate(bh)) { 2381 brelse(bh); 2382 break; 2383 } else 2384 bhlist[j++] = bh; 2385 } 2386 ll_rw_block(READ, j, bhlist); 2387 for (i = 1; i < j; i++) 2388 brelse(bhlist[i]); 2389 bh = bhlist[0]; 2390 wait_on_buffer(bh); 2391 if (buffer_uptodate(bh)) 2392 return bh; 2393 brelse(bh); 2394 return NULL; 2395} 2396 2397/* 2398** read and replay the log 2399** on a clean unmount, the journal header's next unflushed pointer will be to an invalid 2400** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast. 2401** 2402** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid. 2403** 2404** On exit, it sets things up so the first transaction will work correctly. 2405*/ 2406static int journal_read(struct super_block *sb) 2407{ 2408 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2409 struct reiserfs_journal_desc *desc; 2410 unsigned int oldest_trans_id = 0; 2411 unsigned int oldest_invalid_trans_id = 0; 2412 time_t start; 2413 unsigned long oldest_start = 0; 2414 unsigned long cur_dblock = 0; 2415 unsigned long newest_mount_id = 9; 2416 struct buffer_head *d_bh; 2417 struct reiserfs_journal_header *jh; 2418 int valid_journal_header = 0; 2419 int replay_count = 0; 2420 int continue_replay = 1; 2421 int ret; 2422 char b[BDEVNAME_SIZE]; 2423 2424 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2425 reiserfs_info(sb, "checking transaction log (%s)\n", 2426 bdevname(journal->j_dev_bd, b)); 2427 start = get_seconds(); 2428 2429 /* step 1, read in the journal header block. Check the transaction it says 2430 ** is the first unflushed, and if that transaction is not valid, 2431 ** replay is done 2432 */ 2433 journal->j_header_bh = journal_bread(sb, 2434 SB_ONDISK_JOURNAL_1st_BLOCK(sb) 2435 + SB_ONDISK_JOURNAL_SIZE(sb)); 2436 if (!journal->j_header_bh) { 2437 return 1; 2438 } 2439 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data); 2440 if (le32_to_cpu(jh->j_first_unflushed_offset) < 2441 SB_ONDISK_JOURNAL_SIZE(sb) 2442 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { 2443 oldest_start = 2444 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2445 le32_to_cpu(jh->j_first_unflushed_offset); 2446 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; 2447 newest_mount_id = le32_to_cpu(jh->j_mount_id); 2448 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2449 "journal-1153: found in " 2450 "header: first_unflushed_offset %d, last_flushed_trans_id " 2451 "%lu", le32_to_cpu(jh->j_first_unflushed_offset), 2452 le32_to_cpu(jh->j_last_flush_trans_id)); 2453 valid_journal_header = 1; 2454 2455 /* now, we try to read the first unflushed offset. If it is not valid, 2456 ** there is nothing more we can do, and it makes no sense to read 2457 ** through the whole log. 2458 */ 2459 d_bh = 2460 journal_bread(sb, 2461 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2462 le32_to_cpu(jh->j_first_unflushed_offset)); 2463 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL); 2464 if (!ret) { 2465 continue_replay = 0; 2466 } 2467 brelse(d_bh); 2468 goto start_log_replay; 2469 } 2470 2471 /* ok, there are transactions that need to be replayed. start with the first log block, find 2472 ** all the valid transactions, and pick out the oldest. 2473 */ 2474 while (continue_replay 2475 && cur_dblock < 2476 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2477 SB_ONDISK_JOURNAL_SIZE(sb))) { 2478 /* Note that it is required for blocksize of primary fs device and journal 2479 device to be the same */ 2480 d_bh = 2481 reiserfs_breada(journal->j_dev_bd, cur_dblock, 2482 sb->s_blocksize, 2483 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2484 SB_ONDISK_JOURNAL_SIZE(sb)); 2485 ret = 2486 journal_transaction_is_valid(sb, d_bh, 2487 &oldest_invalid_trans_id, 2488 &newest_mount_id); 2489 if (ret == 1) { 2490 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2491 if (oldest_start == 0) { /* init all oldest_ values */ 2492 oldest_trans_id = get_desc_trans_id(desc); 2493 oldest_start = d_bh->b_blocknr; 2494 newest_mount_id = get_desc_mount_id(desc); 2495 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2496 "journal-1179: Setting " 2497 "oldest_start to offset %llu, trans_id %lu", 2498 oldest_start - 2499 SB_ONDISK_JOURNAL_1st_BLOCK 2500 (sb), oldest_trans_id); 2501 } else if (oldest_trans_id > get_desc_trans_id(desc)) { 2502 /* one we just read was older */ 2503 oldest_trans_id = get_desc_trans_id(desc); 2504 oldest_start = d_bh->b_blocknr; 2505 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2506 "journal-1180: Resetting " 2507 "oldest_start to offset %lu, trans_id %lu", 2508 oldest_start - 2509 SB_ONDISK_JOURNAL_1st_BLOCK 2510 (sb), oldest_trans_id); 2511 } 2512 if (newest_mount_id < get_desc_mount_id(desc)) { 2513 newest_mount_id = get_desc_mount_id(desc); 2514 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2515 "journal-1299: Setting " 2516 "newest_mount_id to %d", 2517 get_desc_mount_id(desc)); 2518 } 2519 cur_dblock += get_desc_trans_len(desc) + 2; 2520 } else { 2521 cur_dblock++; 2522 } 2523 brelse(d_bh); 2524 } 2525 2526 start_log_replay: 2527 cur_dblock = oldest_start; 2528 if (oldest_trans_id) { 2529 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2530 "journal-1206: Starting replay " 2531 "from offset %llu, trans_id %lu", 2532 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2533 oldest_trans_id); 2534 2535 } 2536 replay_count = 0; 2537 while (continue_replay && oldest_trans_id > 0) { 2538 ret = 2539 journal_read_transaction(sb, cur_dblock, oldest_start, 2540 oldest_trans_id, newest_mount_id); 2541 if (ret < 0) { 2542 return ret; 2543 } else if (ret != 0) { 2544 break; 2545 } 2546 cur_dblock = 2547 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start; 2548 replay_count++; 2549 if (cur_dblock == oldest_start) 2550 break; 2551 } 2552 2553 if (oldest_trans_id == 0) { 2554 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2555 "journal-1225: No valid " "transactions found"); 2556 } 2557 /* j_start does not get set correctly if we don't replay any transactions. 2558 ** if we had a valid journal_header, set j_start to the first unflushed transaction value, 2559 ** copy the trans_id from the header 2560 */ 2561 if (valid_journal_header && replay_count == 0) { 2562 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); 2563 journal->j_trans_id = 2564 le32_to_cpu(jh->j_last_flush_trans_id) + 1; 2565 /* check for trans_id overflow */ 2566 if (journal->j_trans_id == 0) 2567 journal->j_trans_id = 10; 2568 journal->j_last_flush_trans_id = 2569 le32_to_cpu(jh->j_last_flush_trans_id); 2570 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; 2571 } else { 2572 journal->j_mount_id = newest_mount_id + 1; 2573 } 2574 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " 2575 "newest_mount_id to %lu", journal->j_mount_id); 2576 journal->j_first_unflushed_offset = journal->j_start; 2577 if (replay_count > 0) { 2578 reiserfs_info(sb, 2579 "replayed %d transactions in %lu seconds\n", 2580 replay_count, get_seconds() - start); 2581 } 2582 if (!bdev_read_only(sb->s_bdev) && 2583 _update_journal_header_block(sb, journal->j_start, 2584 journal->j_last_flush_trans_id)) { 2585 /* replay failed, caller must call free_journal_ram and abort 2586 ** the mount 2587 */ 2588 return -1; 2589 } 2590 return 0; 2591} 2592 2593static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s) 2594{ 2595 struct reiserfs_journal_list *jl; 2596 jl = kzalloc(sizeof(struct reiserfs_journal_list), 2597 GFP_NOFS | __GFP_NOFAIL); 2598 INIT_LIST_HEAD(&jl->j_list); 2599 INIT_LIST_HEAD(&jl->j_working_list); 2600 INIT_LIST_HEAD(&jl->j_tail_bh_list); 2601 INIT_LIST_HEAD(&jl->j_bh_list); 2602 mutex_init(&jl->j_commit_mutex); 2603 SB_JOURNAL(s)->j_num_lists++; 2604 get_journal_list(jl); 2605 return jl; 2606} 2607 2608static void journal_list_init(struct super_block *sb) 2609{ 2610 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb); 2611} 2612 2613static int release_journal_dev(struct super_block *super, 2614 struct reiserfs_journal *journal) 2615{ 2616 int result; 2617 2618 result = 0; 2619 2620 if (journal->j_dev_bd != NULL) { 2621 if (journal->j_dev_bd->bd_dev != super->s_dev) 2622 bd_release(journal->j_dev_bd); 2623 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode); 2624 journal->j_dev_bd = NULL; 2625 } 2626 2627 if (result != 0) { 2628 reiserfs_warning(super, "sh-457", 2629 "Cannot release journal device: %i", result); 2630 } 2631 return result; 2632} 2633 2634static int journal_init_dev(struct super_block *super, 2635 struct reiserfs_journal *journal, 2636 const char *jdev_name) 2637{ 2638 int result; 2639 dev_t jdev; 2640 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE; 2641 char b[BDEVNAME_SIZE]; 2642 2643 result = 0; 2644 2645 journal->j_dev_bd = NULL; 2646 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ? 2647 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev; 2648 2649 if (bdev_read_only(super->s_bdev)) 2650 blkdev_mode = FMODE_READ; 2651 2652 /* there is no "jdev" option and journal is on separate device */ 2653 if ((!jdev_name || !jdev_name[0])) { 2654 journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode); 2655 journal->j_dev_mode = blkdev_mode; 2656 if (IS_ERR(journal->j_dev_bd)) { 2657 result = PTR_ERR(journal->j_dev_bd); 2658 journal->j_dev_bd = NULL; 2659 reiserfs_warning(super, "sh-458", 2660 "cannot init journal device '%s': %i", 2661 __bdevname(jdev, b), result); 2662 return result; 2663 } else if (jdev != super->s_dev) { 2664 result = bd_claim(journal->j_dev_bd, journal); 2665 if (result) { 2666 blkdev_put(journal->j_dev_bd, blkdev_mode); 2667 return result; 2668 } 2669 2670 set_blocksize(journal->j_dev_bd, super->s_blocksize); 2671 } 2672 2673 return 0; 2674 } 2675 2676 journal->j_dev_mode = blkdev_mode; 2677 journal->j_dev_bd = open_bdev_exclusive(jdev_name, 2678 blkdev_mode, journal); 2679 if (IS_ERR(journal->j_dev_bd)) { 2680 result = PTR_ERR(journal->j_dev_bd); 2681 journal->j_dev_bd = NULL; 2682 reiserfs_warning(super, 2683 "journal_init_dev: Cannot open '%s': %i", 2684 jdev_name, result); 2685 return result; 2686 } 2687 2688 set_blocksize(journal->j_dev_bd, super->s_blocksize); 2689 reiserfs_info(super, 2690 "journal_init_dev: journal device: %s\n", 2691 bdevname(journal->j_dev_bd, b)); 2692 return 0; 2693} 2694 2695/** 2696 * When creating/tuning a file system user can assign some 2697 * journal params within boundaries which depend on the ratio 2698 * blocksize/standard_blocksize. 2699 * 2700 * For blocks >= standard_blocksize transaction size should 2701 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more 2702 * then JOURNAL_TRANS_MAX_DEFAULT. 2703 * 2704 * For blocks < standard_blocksize these boundaries should be 2705 * decreased proportionally. 2706 */ 2707#define REISERFS_STANDARD_BLKSIZE (4096) 2708 2709static int check_advise_trans_params(struct super_block *sb, 2710 struct reiserfs_journal *journal) 2711{ 2712 if (journal->j_trans_max) { 2713 /* Non-default journal params. 2714 Do sanity check for them. */ 2715 int ratio = 1; 2716 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE) 2717 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize; 2718 2719 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio || 2720 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio || 2721 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max < 2722 JOURNAL_MIN_RATIO) { 2723 reiserfs_warning(sb, "sh-462", 2724 "bad transaction max size (%u). " 2725 "FSCK?", journal->j_trans_max); 2726 return 1; 2727 } 2728 if (journal->j_max_batch != (journal->j_trans_max) * 2729 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) { 2730 reiserfs_warning(sb, "sh-463", 2731 "bad transaction max batch (%u). " 2732 "FSCK?", journal->j_max_batch); 2733 return 1; 2734 } 2735 } else { 2736 /* Default journal params. 2737 The file system was created by old version 2738 of mkreiserfs, so some fields contain zeros, 2739 and we need to advise proper values for them */ 2740 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) { 2741 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)", 2742 sb->s_blocksize); 2743 return 1; 2744 } 2745 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT; 2746 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT; 2747 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE; 2748 } 2749 return 0; 2750} 2751 2752/* 2753** must be called once on fs mount. calls journal_read for you 2754*/ 2755int journal_init(struct super_block *sb, const char *j_dev_name, 2756 int old_format, unsigned int commit_max_age) 2757{ 2758 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2; 2759 struct buffer_head *bhjh; 2760 struct reiserfs_super_block *rs; 2761 struct reiserfs_journal_header *jh; 2762 struct reiserfs_journal *journal; 2763 struct reiserfs_journal_list *jl; 2764 char b[BDEVNAME_SIZE]; 2765 int ret; 2766 2767 /* 2768 * Unlock here to avoid various RECLAIM-FS-ON <-> IN-RECLAIM-FS 2769 * dependency inversion warnings. 2770 */ 2771 reiserfs_write_unlock(sb); 2772 journal = SB_JOURNAL(sb) = vmalloc(sizeof(struct reiserfs_journal)); 2773 if (!journal) { 2774 reiserfs_warning(sb, "journal-1256", 2775 "unable to get memory for journal structure"); 2776 reiserfs_write_lock(sb); 2777 return 1; 2778 } 2779 memset(journal, 0, sizeof(struct reiserfs_journal)); 2780 INIT_LIST_HEAD(&journal->j_bitmap_nodes); 2781 INIT_LIST_HEAD(&journal->j_prealloc_list); 2782 INIT_LIST_HEAD(&journal->j_working_list); 2783 INIT_LIST_HEAD(&journal->j_journal_list); 2784 journal->j_persistent_trans = 0; 2785 ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap, 2786 reiserfs_bmap_count(sb)); 2787 reiserfs_write_lock(sb); 2788 if (ret) 2789 goto free_and_return; 2790 2791 allocate_bitmap_nodes(sb); 2792 2793 /* reserved for journal area support */ 2794 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ? 2795 REISERFS_OLD_DISK_OFFSET_IN_BYTES 2796 / sb->s_blocksize + 2797 reiserfs_bmap_count(sb) + 2798 1 : 2799 REISERFS_DISK_OFFSET_IN_BYTES / 2800 sb->s_blocksize + 2); 2801 2802 /* Sanity check to see is the standard journal fitting withing first bitmap 2803 (actual for small blocksizes) */ 2804 if (!SB_ONDISK_JOURNAL_DEVICE(sb) && 2805 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) + 2806 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) { 2807 reiserfs_warning(sb, "journal-1393", 2808 "journal does not fit for area addressed " 2809 "by first of bitmap blocks. It starts at " 2810 "%u and its size is %u. Block size %ld", 2811 SB_JOURNAL_1st_RESERVED_BLOCK(sb), 2812 SB_ONDISK_JOURNAL_SIZE(sb), 2813 sb->s_blocksize); 2814 goto free_and_return; 2815 } 2816 2817 /* 2818 * We need to unlock here to avoid creating the following 2819 * dependency: 2820 * reiserfs_lock -> sysfs_mutex 2821 * Because the reiserfs mmap path creates the following dependency: 2822 * mm->mmap -> reiserfs_lock, hence we have 2823 * mm->mmap -> reiserfs_lock ->sysfs_mutex 2824 * This would ends up in a circular dependency with sysfs readdir path 2825 * which does sysfs_mutex -> mm->mmap_sem 2826 * This is fine because the reiserfs lock is useless in mount path, 2827 * at least until we call journal_begin. We keep it for paranoid 2828 * reasons. 2829 */ 2830 reiserfs_write_unlock(sb); 2831 if (journal_init_dev(sb, journal, j_dev_name) != 0) { 2832 reiserfs_write_lock(sb); 2833 reiserfs_warning(sb, "sh-462", 2834 "unable to initialize jornal device"); 2835 goto free_and_return; 2836 } 2837 reiserfs_write_lock(sb); 2838 2839 rs = SB_DISK_SUPER_BLOCK(sb); 2840 2841 /* read journal header */ 2842 bhjh = journal_bread(sb, 2843 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2844 SB_ONDISK_JOURNAL_SIZE(sb)); 2845 if (!bhjh) { 2846 reiserfs_warning(sb, "sh-459", 2847 "unable to read journal header"); 2848 goto free_and_return; 2849 } 2850 jh = (struct reiserfs_journal_header *)(bhjh->b_data); 2851 2852 /* make sure that journal matches to the super block */ 2853 if (is_reiserfs_jr(rs) 2854 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) != 2855 sb_jp_journal_magic(rs))) { 2856 reiserfs_warning(sb, "sh-460", 2857 "journal header magic %x (device %s) does " 2858 "not match to magic found in super block %x", 2859 jh->jh_journal.jp_journal_magic, 2860 bdevname(journal->j_dev_bd, b), 2861 sb_jp_journal_magic(rs)); 2862 brelse(bhjh); 2863 goto free_and_return; 2864 } 2865 2866 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max); 2867 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch); 2868 journal->j_max_commit_age = 2869 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age); 2870 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; 2871 2872 if (check_advise_trans_params(sb, journal) != 0) 2873 goto free_and_return; 2874 journal->j_default_max_commit_age = journal->j_max_commit_age; 2875 2876 if (commit_max_age != 0) { 2877 journal->j_max_commit_age = commit_max_age; 2878 journal->j_max_trans_age = commit_max_age; 2879 } 2880 2881 reiserfs_info(sb, "journal params: device %s, size %u, " 2882 "journal first block %u, max trans len %u, max batch %u, " 2883 "max commit age %u, max trans age %u\n", 2884 bdevname(journal->j_dev_bd, b), 2885 SB_ONDISK_JOURNAL_SIZE(sb), 2886 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2887 journal->j_trans_max, 2888 journal->j_max_batch, 2889 journal->j_max_commit_age, journal->j_max_trans_age); 2890 2891 brelse(bhjh); 2892 2893 journal->j_list_bitmap_index = 0; 2894 journal_list_init(sb); 2895 2896 memset(journal->j_list_hash_table, 0, 2897 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); 2898 2899 INIT_LIST_HEAD(&journal->j_dirty_buffers); 2900 spin_lock_init(&journal->j_dirty_buffers_lock); 2901 2902 journal->j_start = 0; 2903 journal->j_len = 0; 2904 journal->j_len_alloc = 0; 2905 atomic_set(&(journal->j_wcount), 0); 2906 atomic_set(&(journal->j_async_throttle), 0); 2907 journal->j_bcount = 0; 2908 journal->j_trans_start_time = 0; 2909 journal->j_last = NULL; 2910 journal->j_first = NULL; 2911 init_waitqueue_head(&(journal->j_join_wait)); 2912 mutex_init(&journal->j_mutex); 2913 mutex_init(&journal->j_flush_mutex); 2914 2915 journal->j_trans_id = 10; 2916 journal->j_mount_id = 10; 2917 journal->j_state = 0; 2918 atomic_set(&(journal->j_jlock), 0); 2919 reiserfs_write_unlock(sb); 2920 journal->j_cnode_free_list = allocate_cnodes(num_cnodes); 2921 reiserfs_write_lock(sb); 2922 journal->j_cnode_free_orig = journal->j_cnode_free_list; 2923 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0; 2924 journal->j_cnode_used = 0; 2925 journal->j_must_wait = 0; 2926 2927 if (journal->j_cnode_free == 0) { 2928 reiserfs_warning(sb, "journal-2004", "Journal cnode memory " 2929 "allocation failed (%ld bytes). Journal is " 2930 "too large for available memory. Usually " 2931 "this is due to a journal that is too large.", 2932 sizeof (struct reiserfs_journal_cnode) * num_cnodes); 2933 goto free_and_return; 2934 } 2935 2936 init_journal_hash(sb); 2937 jl = journal->j_current_jl; 2938 jl->j_list_bitmap = get_list_bitmap(sb, jl); 2939 if (!jl->j_list_bitmap) { 2940 reiserfs_warning(sb, "journal-2005", 2941 "get_list_bitmap failed for journal list 0"); 2942 goto free_and_return; 2943 } 2944 if (journal_read(sb) < 0) { 2945 reiserfs_warning(sb, "reiserfs-2006", 2946 "Replay Failure, unable to mount"); 2947 goto free_and_return; 2948 } 2949 2950 reiserfs_mounted_fs_count++; 2951 if (reiserfs_mounted_fs_count <= 1) { 2952 reiserfs_write_unlock(sb); 2953 commit_wq = create_workqueue("reiserfs"); 2954 reiserfs_write_lock(sb); 2955 } 2956 2957 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits); 2958 journal->j_work_sb = sb; 2959 return 0; 2960 free_and_return: 2961 free_journal_ram(sb); 2962 return 1; 2963} 2964 2965/* 2966** test for a polite end of the current transaction. Used by file_write, and should 2967** be used by delete to make sure they don't write more than can fit inside a single 2968** transaction 2969*/ 2970int journal_transaction_should_end(struct reiserfs_transaction_handle *th, 2971 int new_alloc) 2972{ 2973 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); 2974 time_t now = get_seconds(); 2975 /* cannot restart while nested */ 2976 BUG_ON(!th->t_trans_id); 2977 if (th->t_refcount > 1) 2978 return 0; 2979 if (journal->j_must_wait > 0 || 2980 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch || 2981 atomic_read(&(journal->j_jlock)) || 2982 (now - journal->j_trans_start_time) > journal->j_max_trans_age || 2983 journal->j_cnode_free < (journal->j_trans_max * 3)) { 2984 return 1; 2985 } 2986 /* protected by the BKL here */ 2987 journal->j_len_alloc += new_alloc; 2988 th->t_blocks_allocated += new_alloc ; 2989 return 0; 2990} 2991 2992/* this must be called inside a transaction, and requires the 2993** kernel_lock to be held 2994*/ 2995void reiserfs_block_writes(struct reiserfs_transaction_handle *th) 2996{ 2997 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); 2998 BUG_ON(!th->t_trans_id); 2999 journal->j_must_wait = 1; 3000 set_bit(J_WRITERS_BLOCKED, &journal->j_state); 3001 return; 3002} 3003 3004/* this must be called without a transaction started, and does not 3005** require BKL 3006*/ 3007void reiserfs_allow_writes(struct super_block *s) 3008{ 3009 struct reiserfs_journal *journal = SB_JOURNAL(s); 3010 clear_bit(J_WRITERS_BLOCKED, &journal->j_state); 3011 wake_up(&journal->j_join_wait); 3012} 3013 3014/* this must be called without a transaction started, and does not 3015** require BKL 3016*/ 3017void reiserfs_wait_on_write_block(struct super_block *s) 3018{ 3019 struct reiserfs_journal *journal = SB_JOURNAL(s); 3020 wait_event(journal->j_join_wait, 3021 !test_bit(J_WRITERS_BLOCKED, &journal->j_state)); 3022} 3023 3024static void queue_log_writer(struct super_block *s) 3025{ 3026 wait_queue_t wait; 3027 struct reiserfs_journal *journal = SB_JOURNAL(s); 3028 set_bit(J_WRITERS_QUEUED, &journal->j_state); 3029 3030 /* 3031 * we don't want to use wait_event here because 3032 * we only want to wait once. 3033 */ 3034 init_waitqueue_entry(&wait, current); 3035 add_wait_queue(&journal->j_join_wait, &wait); 3036 set_current_state(TASK_UNINTERRUPTIBLE); 3037 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) { 3038 reiserfs_write_unlock(s); 3039 schedule(); 3040 reiserfs_write_lock(s); 3041 } 3042 __set_current_state(TASK_RUNNING); 3043 remove_wait_queue(&journal->j_join_wait, &wait); 3044} 3045 3046static void wake_queued_writers(struct super_block *s) 3047{ 3048 struct reiserfs_journal *journal = SB_JOURNAL(s); 3049 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state)) 3050 wake_up(&journal->j_join_wait); 3051} 3052 3053static void let_transaction_grow(struct super_block *sb, unsigned int trans_id) 3054{ 3055 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3056 unsigned long bcount = journal->j_bcount; 3057 while (1) { 3058 reiserfs_write_unlock(sb); 3059 schedule_timeout_uninterruptible(1); 3060 reiserfs_write_lock(sb); 3061 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING; 3062 while ((atomic_read(&journal->j_wcount) > 0 || 3063 atomic_read(&journal->j_jlock)) && 3064 journal->j_trans_id == trans_id) { 3065 queue_log_writer(sb); 3066 } 3067 if (journal->j_trans_id != trans_id) 3068 break; 3069 if (bcount == journal->j_bcount) 3070 break; 3071 bcount = journal->j_bcount; 3072 } 3073} 3074 3075/* join == true if you must join an existing transaction. 3076** join == false if you can deal with waiting for others to finish 3077** 3078** this will block until the transaction is joinable. send the number of blocks you 3079** expect to use in nblocks. 3080*/ 3081static int do_journal_begin_r(struct reiserfs_transaction_handle *th, 3082 struct super_block *sb, unsigned long nblocks, 3083 int join) 3084{ 3085 time_t now = get_seconds(); 3086 unsigned int old_trans_id; 3087 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3088 struct reiserfs_transaction_handle myth; 3089 int sched_count = 0; 3090 int retval; 3091 3092 reiserfs_check_lock_depth(sb, "journal_begin"); 3093 BUG_ON(nblocks > journal->j_trans_max); 3094 3095 PROC_INFO_INC(sb, journal.journal_being); 3096 /* set here for journal_join */ 3097 th->t_refcount = 1; 3098 th->t_super = sb; 3099 3100 relock: 3101 lock_journal(sb); 3102 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) { 3103 unlock_journal(sb); 3104 retval = journal->j_errno; 3105 goto out_fail; 3106 } 3107 journal->j_bcount++; 3108 3109 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) { 3110 unlock_journal(sb); 3111 reiserfs_write_unlock(sb); 3112 reiserfs_wait_on_write_block(sb); 3113 reiserfs_write_lock(sb); 3114 PROC_INFO_INC(sb, journal.journal_relock_writers); 3115 goto relock; 3116 } 3117 now = get_seconds(); 3118 3119 /* if there is no room in the journal OR 3120 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning 3121 ** we don't sleep if there aren't other writers 3122 */ 3123 3124 if ((!join && journal->j_must_wait > 0) || 3125 (!join 3126 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) 3127 || (!join && atomic_read(&journal->j_wcount) > 0 3128 && journal->j_trans_start_time > 0 3129 && (now - journal->j_trans_start_time) > 3130 journal->j_max_trans_age) || (!join 3131 && atomic_read(&journal->j_jlock)) 3132 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { 3133 3134 old_trans_id = journal->j_trans_id; 3135 unlock_journal(sb); /* allow others to finish this transaction */ 3136 3137 if (!join && (journal->j_len_alloc + nblocks + 2) >= 3138 journal->j_max_batch && 3139 ((journal->j_len + nblocks + 2) * 100) < 3140 (journal->j_len_alloc * 75)) { 3141 if (atomic_read(&journal->j_wcount) > 10) { 3142 sched_count++; 3143 queue_log_writer(sb); 3144 goto relock; 3145 } 3146 } 3147 /* don't mess with joining the transaction if all we have to do is 3148 * wait for someone else to do a commit 3149 */ 3150 if (atomic_read(&journal->j_jlock)) { 3151 while (journal->j_trans_id == old_trans_id && 3152 atomic_read(&journal->j_jlock)) { 3153 queue_log_writer(sb); 3154 } 3155 goto relock; 3156 } 3157 retval = journal_join(&myth, sb, 1); 3158 if (retval) 3159 goto out_fail; 3160 3161 /* someone might have ended the transaction while we joined */ 3162 if (old_trans_id != journal->j_trans_id) { 3163 retval = do_journal_end(&myth, sb, 1, 0); 3164 } else { 3165 retval = do_journal_end(&myth, sb, 1, COMMIT_NOW); 3166 } 3167 3168 if (retval) 3169 goto out_fail; 3170 3171 PROC_INFO_INC(sb, journal.journal_relock_wcount); 3172 goto relock; 3173 } 3174 /* we are the first writer, set trans_id */ 3175 if (journal->j_trans_start_time == 0) { 3176 journal->j_trans_start_time = get_seconds(); 3177 } 3178 atomic_inc(&(journal->j_wcount)); 3179 journal->j_len_alloc += nblocks; 3180 th->t_blocks_logged = 0; 3181 th->t_blocks_allocated = nblocks; 3182 th->t_trans_id = journal->j_trans_id; 3183 unlock_journal(sb); 3184 INIT_LIST_HEAD(&th->t_list); 3185 get_fs_excl(); 3186 return 0; 3187 3188 out_fail: 3189 memset(th, 0, sizeof(*th)); 3190 /* Re-set th->t_super, so we can properly keep track of how many 3191 * persistent transactions there are. We need to do this so if this 3192 * call is part of a failed restart_transaction, we can free it later */ 3193 th->t_super = sb; 3194 return retval; 3195} 3196 3197struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct 3198 super_block 3199 *s, 3200 int nblocks) 3201{ 3202 int ret; 3203 struct reiserfs_transaction_handle *th; 3204 3205 /* if we're nesting into an existing transaction. It will be 3206 ** persistent on its own 3207 */ 3208 if (reiserfs_transaction_running(s)) { 3209 th = current->journal_info; 3210 th->t_refcount++; 3211 BUG_ON(th->t_refcount < 2); 3212 3213 return th; 3214 } 3215 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); 3216 if (!th) 3217 return NULL; 3218 ret = journal_begin(th, s, nblocks); 3219 if (ret) { 3220 kfree(th); 3221 return NULL; 3222 } 3223 3224 SB_JOURNAL(s)->j_persistent_trans++; 3225 return th; 3226} 3227 3228int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) 3229{ 3230 struct super_block *s = th->t_super; 3231 int ret = 0; 3232 if (th->t_trans_id) 3233 ret = journal_end(th, th->t_super, th->t_blocks_allocated); 3234 else 3235 ret = -EIO; 3236 if (th->t_refcount == 0) { 3237 SB_JOURNAL(s)->j_persistent_trans--; 3238 kfree(th); 3239 } 3240 return ret; 3241} 3242 3243static int journal_join(struct reiserfs_transaction_handle *th, 3244 struct super_block *sb, unsigned long nblocks) 3245{ 3246 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3247 3248 /* this keeps do_journal_end from NULLing out the current->journal_info 3249 ** pointer 3250 */ 3251 th->t_handle_save = cur_th; 3252 BUG_ON(cur_th && cur_th->t_refcount > 1); 3253 return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN); 3254} 3255 3256int journal_join_abort(struct reiserfs_transaction_handle *th, 3257 struct super_block *sb, unsigned long nblocks) 3258{ 3259 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3260 3261 /* this keeps do_journal_end from NULLing out the current->journal_info 3262 ** pointer 3263 */ 3264 th->t_handle_save = cur_th; 3265 BUG_ON(cur_th && cur_th->t_refcount > 1); 3266 return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT); 3267} 3268 3269int journal_begin(struct reiserfs_transaction_handle *th, 3270 struct super_block *sb, unsigned long nblocks) 3271{ 3272 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3273 int ret; 3274 3275 th->t_handle_save = NULL; 3276 if (cur_th) { 3277 /* we are nesting into the current transaction */ 3278 if (cur_th->t_super == sb) { 3279 BUG_ON(!cur_th->t_refcount); 3280 cur_th->t_refcount++; 3281 memcpy(th, cur_th, sizeof(*th)); 3282 if (th->t_refcount <= 1) 3283 reiserfs_warning(sb, "reiserfs-2005", 3284 "BAD: refcount <= 1, but " 3285 "journal_info != 0"); 3286 return 0; 3287 } else { 3288 /* we've ended up with a handle from a different filesystem. 3289 ** save it and restore on journal_end. This should never 3290 ** really happen... 3291 */ 3292 reiserfs_warning(sb, "clm-2100", 3293 "nesting info a different FS"); 3294 th->t_handle_save = current->journal_info; 3295 current->journal_info = th; 3296 } 3297 } else { 3298 current->journal_info = th; 3299 } 3300 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG); 3301 BUG_ON(current->journal_info != th); 3302 3303 /* I guess this boils down to being the reciprocal of clm-2100 above. 3304 * If do_journal_begin_r fails, we need to put it back, since journal_end 3305 * won't be called to do it. */ 3306 if (ret) 3307 current->journal_info = th->t_handle_save; 3308 else 3309 BUG_ON(!th->t_refcount); 3310 3311 return ret; 3312} 3313 3314/* 3315** puts bh into the current transaction. If it was already there, reorders removes the 3316** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order). 3317** 3318** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the 3319** transaction is committed. 3320** 3321** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. 3322*/ 3323int journal_mark_dirty(struct reiserfs_transaction_handle *th, 3324 struct super_block *sb, struct buffer_head *bh) 3325{ 3326 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3327 struct reiserfs_journal_cnode *cn = NULL; 3328 int count_already_incd = 0; 3329 int prepared = 0; 3330 BUG_ON(!th->t_trans_id); 3331 3332 PROC_INFO_INC(sb, journal.mark_dirty); 3333 if (th->t_trans_id != journal->j_trans_id) { 3334 reiserfs_panic(th->t_super, "journal-1577", 3335 "handle trans id %ld != current trans id %ld", 3336 th->t_trans_id, journal->j_trans_id); 3337 } 3338 3339 sb->s_dirt = 1; 3340 3341 prepared = test_clear_buffer_journal_prepared(bh); 3342 clear_buffer_journal_restore_dirty(bh); 3343 /* already in this transaction, we are done */ 3344 if (buffer_journaled(bh)) { 3345 PROC_INFO_INC(sb, journal.mark_dirty_already); 3346 return 0; 3347 } 3348 3349 /* this must be turned into a panic instead of a warning. We can't allow 3350 ** a dirty or journal_dirty or locked buffer to be logged, as some changes 3351 ** could get to disk too early. NOT GOOD. 3352 */ 3353 if (!prepared || buffer_dirty(bh)) { 3354 reiserfs_warning(sb, "journal-1777", 3355 "buffer %llu bad state " 3356 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT", 3357 (unsigned long long)bh->b_blocknr, 3358 prepared ? ' ' : '!', 3359 buffer_locked(bh) ? ' ' : '!', 3360 buffer_dirty(bh) ? ' ' : '!', 3361 buffer_journal_dirty(bh) ? ' ' : '!'); 3362 } 3363 3364 if (atomic_read(&(journal->j_wcount)) <= 0) { 3365 reiserfs_warning(sb, "journal-1409", 3366 "returning because j_wcount was %d", 3367 atomic_read(&(journal->j_wcount))); 3368 return 1; 3369 } 3370 /* this error means I've screwed up, and we've overflowed the transaction. 3371 ** Nothing can be done here, except make the FS readonly or panic. 3372 */ 3373 if (journal->j_len >= journal->j_trans_max) { 3374 reiserfs_panic(th->t_super, "journal-1413", 3375 "j_len (%lu) is too big", 3376 journal->j_len); 3377 } 3378 3379 if (buffer_journal_dirty(bh)) { 3380 count_already_incd = 1; 3381 PROC_INFO_INC(sb, journal.mark_dirty_notjournal); 3382 clear_buffer_journal_dirty(bh); 3383 } 3384 3385 if (journal->j_len > journal->j_len_alloc) { 3386 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT; 3387 } 3388 3389 set_buffer_journaled(bh); 3390 3391 /* now put this guy on the end */ 3392 if (!cn) { 3393 cn = get_cnode(sb); 3394 if (!cn) { 3395 reiserfs_panic(sb, "journal-4", "get_cnode failed!"); 3396 } 3397 3398 if (th->t_blocks_logged == th->t_blocks_allocated) { 3399 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT; 3400 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT; 3401 } 3402 th->t_blocks_logged++; 3403 journal->j_len++; 3404 3405 cn->bh = bh; 3406 cn->blocknr = bh->b_blocknr; 3407 cn->sb = sb; 3408 cn->jlist = NULL; 3409 insert_journal_hash(journal->j_hash_table, cn); 3410 if (!count_already_incd) { 3411 get_bh(bh); 3412 } 3413 } 3414 cn->next = NULL; 3415 cn->prev = journal->j_last; 3416 cn->bh = bh; 3417 if (journal->j_last) { 3418 journal->j_last->next = cn; 3419 journal->j_last = cn; 3420 } else { 3421 journal->j_first = cn; 3422 journal->j_last = cn; 3423 } 3424 return 0; 3425} 3426 3427int journal_end(struct reiserfs_transaction_handle *th, 3428 struct super_block *sb, unsigned long nblocks) 3429{ 3430 if (!current->journal_info && th->t_refcount > 1) 3431 reiserfs_warning(sb, "REISER-NESTING", 3432 "th NULL, refcount %d", th->t_refcount); 3433 3434 if (!th->t_trans_id) { 3435 WARN_ON(1); 3436 return -EIO; 3437 } 3438 3439 th->t_refcount--; 3440 if (th->t_refcount > 0) { 3441 struct reiserfs_transaction_handle *cur_th = 3442 current->journal_info; 3443 3444 /* we aren't allowed to close a nested transaction on a different 3445 ** filesystem from the one in the task struct 3446 */ 3447 BUG_ON(cur_th->t_super != th->t_super); 3448 3449 if (th != cur_th) { 3450 memcpy(current->journal_info, th, sizeof(*th)); 3451 th->t_trans_id = 0; 3452 } 3453 return 0; 3454 } else { 3455 return do_journal_end(th, sb, nblocks, 0); 3456 } 3457} 3458 3459/* removes from the current transaction, relsing and descrementing any counters. 3460** also files the removed buffer directly onto the clean list 3461** 3462** called by journal_mark_freed when a block has been deleted 3463** 3464** returns 1 if it cleaned and relsed the buffer. 0 otherwise 3465*/ 3466static int remove_from_transaction(struct super_block *sb, 3467 b_blocknr_t blocknr, int already_cleaned) 3468{ 3469 struct buffer_head *bh; 3470 struct reiserfs_journal_cnode *cn; 3471 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3472 int ret = 0; 3473 3474 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); 3475 if (!cn || !cn->bh) { 3476 return ret; 3477 } 3478 bh = cn->bh; 3479 if (cn->prev) { 3480 cn->prev->next = cn->next; 3481 } 3482 if (cn->next) { 3483 cn->next->prev = cn->prev; 3484 } 3485 if (cn == journal->j_first) { 3486 journal->j_first = cn->next; 3487 } 3488 if (cn == journal->j_last) { 3489 journal->j_last = cn->prev; 3490 } 3491 if (bh) 3492 remove_journal_hash(sb, journal->j_hash_table, NULL, 3493 bh->b_blocknr, 0); 3494 clear_buffer_journaled(bh); /* don't log this one */ 3495 3496 if (!already_cleaned) { 3497 clear_buffer_journal_dirty(bh); 3498 clear_buffer_dirty(bh); 3499 clear_buffer_journal_test(bh); 3500 put_bh(bh); 3501 if (atomic_read(&(bh->b_count)) < 0) { 3502 reiserfs_warning(sb, "journal-1752", 3503 "b_count < 0"); 3504 } 3505 ret = 1; 3506 } 3507 journal->j_len--; 3508 journal->j_len_alloc--; 3509 free_cnode(sb, cn); 3510 return ret; 3511} 3512 3513/* 3514** for any cnode in a journal list, it can only be dirtied of all the 3515** transactions that include it are committed to disk. 3516** this checks through each transaction, and returns 1 if you are allowed to dirty, 3517** and 0 if you aren't 3518** 3519** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log 3520** blocks for a given transaction on disk 3521** 3522*/ 3523static int can_dirty(struct reiserfs_journal_cnode *cn) 3524{ 3525 struct super_block *sb = cn->sb; 3526 b_blocknr_t blocknr = cn->blocknr; 3527 struct reiserfs_journal_cnode *cur = cn->hprev; 3528 int can_dirty = 1; 3529 3530 /* first test hprev. These are all newer than cn, so any node here 3531 ** with the same block number and dev means this node can't be sent 3532 ** to disk right now. 3533 */ 3534 while (cur && can_dirty) { 3535 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && 3536 cur->blocknr == blocknr) { 3537 can_dirty = 0; 3538 } 3539 cur = cur->hprev; 3540 } 3541 /* then test hnext. These are all older than cn. As long as they 3542 ** are committed to the log, it is safe to write cn to disk 3543 */ 3544 cur = cn->hnext; 3545 while (cur && can_dirty) { 3546 if (cur->jlist && cur->jlist->j_len > 0 && 3547 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh && 3548 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { 3549 can_dirty = 0; 3550 } 3551 cur = cur->hnext; 3552 } 3553 return can_dirty; 3554} 3555 3556/* syncs the commit blocks, but does not force the real buffers to disk 3557** will wait until the current transaction is done/committed before returning 3558*/ 3559int journal_end_sync(struct reiserfs_transaction_handle *th, 3560 struct super_block *sb, unsigned long nblocks) 3561{ 3562 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3563 3564 BUG_ON(!th->t_trans_id); 3565 /* you can sync while nested, very, very bad */ 3566 BUG_ON(th->t_refcount > 1); 3567 if (journal->j_len == 0) { 3568 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 3569 1); 3570 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb)); 3571 } 3572 return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT); 3573} 3574 3575/* 3576** writeback the pending async commits to disk 3577*/ 3578static void flush_async_commits(struct work_struct *work) 3579{ 3580 struct reiserfs_journal *journal = 3581 container_of(work, struct reiserfs_journal, j_work.work); 3582 struct super_block *sb = journal->j_work_sb; 3583 struct reiserfs_journal_list *jl; 3584 struct list_head *entry; 3585 3586 reiserfs_write_lock(sb); 3587 if (!list_empty(&journal->j_journal_list)) { 3588 /* last entry is the youngest, commit it and you get everything */ 3589 entry = journal->j_journal_list.prev; 3590 jl = JOURNAL_LIST_ENTRY(entry); 3591 flush_commit_list(sb, jl, 1); 3592 } 3593 reiserfs_write_unlock(sb); 3594} 3595 3596/* 3597** flushes any old transactions to disk 3598** ends the current transaction if it is too old 3599*/ 3600int reiserfs_flush_old_commits(struct super_block *sb) 3601{ 3602 time_t now; 3603 struct reiserfs_transaction_handle th; 3604 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3605 3606 now = get_seconds(); 3607 /* safety check so we don't flush while we are replaying the log during 3608 * mount 3609 */ 3610 if (list_empty(&journal->j_journal_list)) { 3611 return 0; 3612 } 3613 3614 /* check the current transaction. If there are no writers, and it is 3615 * too old, finish it, and force the commit blocks to disk 3616 */ 3617 if (atomic_read(&journal->j_wcount) <= 0 && 3618 journal->j_trans_start_time > 0 && 3619 journal->j_len > 0 && 3620 (now - journal->j_trans_start_time) > journal->j_max_trans_age) { 3621 if (!journal_join(&th, sb, 1)) { 3622 reiserfs_prepare_for_journal(sb, 3623 SB_BUFFER_WITH_SB(sb), 3624 1); 3625 journal_mark_dirty(&th, sb, 3626 SB_BUFFER_WITH_SB(sb)); 3627 3628 /* we're only being called from kreiserfsd, it makes no sense to do 3629 ** an async commit so that kreiserfsd can do it later 3630 */ 3631 do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT); 3632 } 3633 } 3634 return sb->s_dirt; 3635} 3636 3637/* 3638** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit 3639** 3640** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all 3641** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just 3642** flushes the commit list and returns 0. 3643** 3644** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait. 3645** 3646** Note, we can't allow the journal_end to proceed while there are still writers in the log. 3647*/ 3648static int check_journal_end(struct reiserfs_transaction_handle *th, 3649 struct super_block *sb, unsigned long nblocks, 3650 int flags) 3651{ 3652 3653 time_t now; 3654 int flush = flags & FLUSH_ALL; 3655 int commit_now = flags & COMMIT_NOW; 3656 int wait_on_commit = flags & WAIT; 3657 struct reiserfs_journal_list *jl; 3658 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3659 3660 BUG_ON(!th->t_trans_id); 3661 3662 if (th->t_trans_id != journal->j_trans_id) { 3663 reiserfs_panic(th->t_super, "journal-1577", 3664 "handle trans id %ld != current trans id %ld", 3665 th->t_trans_id, journal->j_trans_id); 3666 } 3667 3668 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); 3669 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */ 3670 atomic_dec(&(journal->j_wcount)); 3671 } 3672 3673 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released 3674 ** will be dealt with by next transaction that actually writes something, but should be taken 3675 ** care of in this trans 3676 */ 3677 BUG_ON(journal->j_len == 0); 3678 3679 /* if wcount > 0, and we are called to with flush or commit_now, 3680 ** we wait on j_join_wait. We will wake up when the last writer has 3681 ** finished the transaction, and started it on its way to the disk. 3682 ** Then, we flush the commit or journal list, and just return 0 3683 ** because the rest of journal end was already done for this transaction. 3684 */ 3685 if (atomic_read(&(journal->j_wcount)) > 0) { 3686 if (flush || commit_now) { 3687 unsigned trans_id; 3688 3689 jl = journal->j_current_jl; 3690 trans_id = jl->j_trans_id; 3691 if (wait_on_commit) 3692 jl->j_state |= LIST_COMMIT_PENDING; 3693 atomic_set(&(journal->j_jlock), 1); 3694 if (flush) { 3695 journal->j_next_full_flush = 1; 3696 } 3697 unlock_journal(sb); 3698 3699 /* sleep while the current transaction is still j_jlocked */ 3700 while (journal->j_trans_id == trans_id) { 3701 if (atomic_read(&journal->j_jlock)) { 3702 queue_log_writer(sb); 3703 } else { 3704 lock_journal(sb); 3705 if (journal->j_trans_id == trans_id) { 3706 atomic_set(&(journal->j_jlock), 3707 1); 3708 } 3709 unlock_journal(sb); 3710 } 3711 } 3712 BUG_ON(journal->j_trans_id == trans_id); 3713 3714 if (commit_now 3715 && journal_list_still_alive(sb, trans_id) 3716 && wait_on_commit) { 3717 flush_commit_list(sb, jl, 1); 3718 } 3719 return 0; 3720 } 3721 unlock_journal(sb); 3722 return 0; 3723 } 3724 3725 /* deal with old transactions where we are the last writers */ 3726 now = get_seconds(); 3727 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) { 3728 commit_now = 1; 3729 journal->j_next_async_flush = 1; 3730 } 3731 /* don't batch when someone is waiting on j_join_wait */ 3732 /* don't batch when syncing the commit or flushing the whole trans */ 3733 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock))) 3734 && !flush && !commit_now && (journal->j_len < journal->j_max_batch) 3735 && journal->j_len_alloc < journal->j_max_batch 3736 && journal->j_cnode_free > (journal->j_trans_max * 3)) { 3737 journal->j_bcount++; 3738 unlock_journal(sb); 3739 return 0; 3740 } 3741 3742 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) { 3743 reiserfs_panic(sb, "journal-003", 3744 "j_start (%ld) is too high", 3745 journal->j_start); 3746 } 3747 return 1; 3748} 3749 3750/* 3751** Does all the work that makes deleting blocks safe. 3752** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on. 3753** 3754** otherwise: 3755** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes 3756** before this transaction has finished. 3757** 3758** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with 3759** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash, 3760** the block can't be reallocated yet. 3761** 3762** Then remove it from the current transaction, decrementing any counters and filing it on the clean list. 3763*/ 3764int journal_mark_freed(struct reiserfs_transaction_handle *th, 3765 struct super_block *sb, b_blocknr_t blocknr) 3766{ 3767 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3768 struct reiserfs_journal_cnode *cn = NULL; 3769 struct buffer_head *bh = NULL; 3770 struct reiserfs_list_bitmap *jb = NULL; 3771 int cleaned = 0; 3772 BUG_ON(!th->t_trans_id); 3773 3774 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); 3775 if (cn && cn->bh) { 3776 bh = cn->bh; 3777 get_bh(bh); 3778 } 3779 /* if it is journal new, we just remove it from this transaction */ 3780 if (bh && buffer_journal_new(bh)) { 3781 clear_buffer_journal_new(bh); 3782 clear_prepared_bits(bh); 3783 reiserfs_clean_and_file_buffer(bh); 3784 cleaned = remove_from_transaction(sb, blocknr, cleaned); 3785 } else { 3786 /* set the bit for this block in the journal bitmap for this transaction */ 3787 jb = journal->j_current_jl->j_list_bitmap; 3788 if (!jb) { 3789 reiserfs_panic(sb, "journal-1702", 3790 "journal_list_bitmap is NULL"); 3791 } 3792 set_bit_in_list_bitmap(sb, blocknr, jb); 3793 3794 /* Note, the entire while loop is not allowed to schedule. */ 3795 3796 if (bh) { 3797 clear_prepared_bits(bh); 3798 reiserfs_clean_and_file_buffer(bh); 3799 } 3800 cleaned = remove_from_transaction(sb, blocknr, cleaned); 3801 3802 /* find all older transactions with this block, make sure they don't try to write it out */ 3803 cn = get_journal_hash_dev(sb, journal->j_list_hash_table, 3804 blocknr); 3805 while (cn) { 3806 if (sb == cn->sb && blocknr == cn->blocknr) { 3807 set_bit(BLOCK_FREED, &cn->state); 3808 if (cn->bh) { 3809 if (!cleaned) { 3810 /* remove_from_transaction will brelse the buffer if it was 3811 ** in the current trans 3812 */ 3813 clear_buffer_journal_dirty(cn-> 3814 bh); 3815 clear_buffer_dirty(cn->bh); 3816 clear_buffer_journal_test(cn-> 3817 bh); 3818 cleaned = 1; 3819 put_bh(cn->bh); 3820 if (atomic_read 3821 (&(cn->bh->b_count)) < 0) { 3822 reiserfs_warning(sb, 3823 "journal-2138", 3824 "cn->bh->b_count < 0"); 3825 } 3826 } 3827 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */ 3828 atomic_dec(& 3829 (cn->jlist-> 3830 j_nonzerolen)); 3831 } 3832 cn->bh = NULL; 3833 } 3834 } 3835 cn = cn->hnext; 3836 } 3837 } 3838 3839 if (bh) 3840 release_buffer_page(bh); /* get_hash grabs the buffer */ 3841 return 0; 3842} 3843 3844void reiserfs_update_inode_transaction(struct inode *inode) 3845{ 3846 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb); 3847 REISERFS_I(inode)->i_jl = journal->j_current_jl; 3848 REISERFS_I(inode)->i_trans_id = journal->j_trans_id; 3849} 3850 3851/* 3852 * returns -1 on error, 0 if no commits/barriers were done and 1 3853 * if a transaction was actually committed and the barrier was done 3854 */ 3855static int __commit_trans_jl(struct inode *inode, unsigned long id, 3856 struct reiserfs_journal_list *jl) 3857{ 3858 struct reiserfs_transaction_handle th; 3859 struct super_block *sb = inode->i_sb; 3860 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3861 int ret = 0; 3862 3863 /* is it from the current transaction, or from an unknown transaction? */ 3864 if (id == journal->j_trans_id) { 3865 jl = journal->j_current_jl; 3866 /* try to let other writers come in and grow this transaction */ 3867 let_transaction_grow(sb, id); 3868 if (journal->j_trans_id != id) { 3869 goto flush_commit_only; 3870 } 3871 3872 ret = journal_begin(&th, sb, 1); 3873 if (ret) 3874 return ret; 3875 3876 /* someone might have ended this transaction while we joined */ 3877 if (journal->j_trans_id != id) { 3878 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 3879 1); 3880 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb)); 3881 ret = journal_end(&th, sb, 1); 3882 goto flush_commit_only; 3883 } 3884 3885 ret = journal_end_sync(&th, sb, 1); 3886 if (!ret) 3887 ret = 1; 3888 3889 } else { 3890 /* this gets tricky, we have to make sure the journal list in 3891 * the inode still exists. We know the list is still around 3892 * if we've got a larger transaction id than the oldest list 3893 */ 3894 flush_commit_only: 3895 if (journal_list_still_alive(inode->i_sb, id)) { 3896 /* 3897 * we only set ret to 1 when we know for sure 3898 * the barrier hasn't been started yet on the commit 3899 * block. 3900 */ 3901 if (atomic_read(&jl->j_commit_left) > 1) 3902 ret = 1; 3903 flush_commit_list(sb, jl, 1); 3904 if (journal->j_errno) 3905 ret = journal->j_errno; 3906 } 3907 } 3908 /* otherwise the list is gone, and long since committed */ 3909 return ret; 3910} 3911 3912int reiserfs_commit_for_inode(struct inode *inode) 3913{ 3914 unsigned int id = REISERFS_I(inode)->i_trans_id; 3915 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; 3916 3917 /* for the whole inode, assume unset id means it was 3918 * changed in the current transaction. More conservative 3919 */ 3920 if (!id || !jl) { 3921 reiserfs_update_inode_transaction(inode); 3922 id = REISERFS_I(inode)->i_trans_id; 3923 /* jl will be updated in __commit_trans_jl */ 3924 } 3925 3926 return __commit_trans_jl(inode, id, jl); 3927} 3928 3929void reiserfs_restore_prepared_buffer(struct super_block *sb, 3930 struct buffer_head *bh) 3931{ 3932 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3933 PROC_INFO_INC(sb, journal.restore_prepared); 3934 if (!bh) { 3935 return; 3936 } 3937 if (test_clear_buffer_journal_restore_dirty(bh) && 3938 buffer_journal_dirty(bh)) { 3939 struct reiserfs_journal_cnode *cn; 3940 cn = get_journal_hash_dev(sb, 3941 journal->j_list_hash_table, 3942 bh->b_blocknr); 3943 if (cn && can_dirty(cn)) { 3944 set_buffer_journal_test(bh); 3945 mark_buffer_dirty(bh); 3946 } 3947 } 3948 clear_buffer_journal_prepared(bh); 3949} 3950 3951extern struct tree_balance *cur_tb; 3952/* 3953** before we can change a metadata block, we have to make sure it won't 3954** be written to disk while we are altering it. So, we must: 3955** clean it 3956** wait on it. 3957** 3958*/ 3959int reiserfs_prepare_for_journal(struct super_block *sb, 3960 struct buffer_head *bh, int wait) 3961{ 3962 PROC_INFO_INC(sb, journal.prepare); 3963 3964 if (!trylock_buffer(bh)) { 3965 if (!wait) 3966 return 0; 3967 lock_buffer(bh); 3968 } 3969 set_buffer_journal_prepared(bh); 3970 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) { 3971 clear_buffer_journal_test(bh); 3972 set_buffer_journal_restore_dirty(bh); 3973 } 3974 unlock_buffer(bh); 3975 return 1; 3976} 3977 3978static void flush_old_journal_lists(struct super_block *s) 3979{ 3980 struct reiserfs_journal *journal = SB_JOURNAL(s); 3981 struct reiserfs_journal_list *jl; 3982 struct list_head *entry; 3983 time_t now = get_seconds(); 3984 3985 while (!list_empty(&journal->j_journal_list)) { 3986 entry = journal->j_journal_list.next; 3987 jl = JOURNAL_LIST_ENTRY(entry); 3988 /* this check should always be run, to send old lists to disk */ 3989 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) && 3990 atomic_read(&jl->j_commit_left) == 0 && 3991 test_transaction(s, jl)) { 3992 flush_used_journal_lists(s, jl); 3993 } else { 3994 break; 3995 } 3996 } 3997} 3998 3999/* 4000** long and ugly. If flush, will not return until all commit 4001** blocks and all real buffers in the trans are on disk. 4002** If no_async, won't return until all commit blocks are on disk. 4003** 4004** keep reading, there are comments as you go along 4005** 4006** If the journal is aborted, we just clean up. Things like flushing 4007** journal lists, etc just won't happen. 4008*/ 4009static int do_journal_end(struct reiserfs_transaction_handle *th, 4010 struct super_block *sb, unsigned long nblocks, 4011 int flags) 4012{ 4013 struct reiserfs_journal *journal = SB_JOURNAL(sb); 4014 struct reiserfs_journal_cnode *cn, *next, *jl_cn; 4015 struct reiserfs_journal_cnode *last_cn = NULL; 4016 struct reiserfs_journal_desc *desc; 4017 struct reiserfs_journal_commit *commit; 4018 struct buffer_head *c_bh; /* commit bh */ 4019 struct buffer_head *d_bh; /* desc bh */ 4020 int cur_write_start = 0; /* start index of current log write */ 4021 int old_start; 4022 int i; 4023 int flush; 4024 int wait_on_commit; 4025 struct reiserfs_journal_list *jl, *temp_jl; 4026 struct list_head *entry, *safe; 4027 unsigned long jindex; 4028 unsigned int commit_trans_id; 4029 int trans_half; 4030 4031 BUG_ON(th->t_refcount > 1); 4032 BUG_ON(!th->t_trans_id); 4033 4034 /* protect flush_older_commits from doing mistakes if the 4035 transaction ID counter gets overflowed. */ 4036 if (th->t_trans_id == ~0U) 4037 flags |= FLUSH_ALL | COMMIT_NOW | WAIT; 4038 flush = flags & FLUSH_ALL; 4039 wait_on_commit = flags & WAIT; 4040 4041 put_fs_excl(); 4042 current->journal_info = th->t_handle_save; 4043 reiserfs_check_lock_depth(sb, "journal end"); 4044 if (journal->j_len == 0) { 4045 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 4046 1); 4047 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb)); 4048 } 4049 4050 lock_journal(sb); 4051 if (journal->j_next_full_flush) { 4052 flags |= FLUSH_ALL; 4053 flush = 1; 4054 } 4055 if (journal->j_next_async_flush) { 4056 flags |= COMMIT_NOW | WAIT; 4057 wait_on_commit = 1; 4058 } 4059 4060 /* check_journal_end locks the journal, and unlocks if it does not return 1 4061 ** it tells us if we should continue with the journal_end, or just return 4062 */ 4063 if (!check_journal_end(th, sb, nblocks, flags)) { 4064 sb->s_dirt = 1; 4065 wake_queued_writers(sb); 4066 reiserfs_async_progress_wait(sb); 4067 goto out; 4068 } 4069 4070 /* check_journal_end might set these, check again */ 4071 if (journal->j_next_full_flush) { 4072 flush = 1; 4073 } 4074 4075 /* 4076 ** j must wait means we have to flush the log blocks, and the real blocks for 4077 ** this transaction 4078 */ 4079 if (journal->j_must_wait > 0) { 4080 flush = 1; 4081 } 4082#ifdef REISERFS_PREALLOCATE 4083 /* quota ops might need to nest, setup the journal_info pointer for them 4084 * and raise the refcount so that it is > 0. */ 4085 current->journal_info = th; 4086 th->t_refcount++; 4087 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into 4088 * the transaction */ 4089 th->t_refcount--; 4090 current->journal_info = th->t_handle_save; 4091#endif 4092 4093 /* setup description block */ 4094 d_bh = 4095 journal_getblk(sb, 4096 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 4097 journal->j_start); 4098 set_buffer_uptodate(d_bh); 4099 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data; 4100 memset(d_bh->b_data, 0, d_bh->b_size); 4101 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); 4102 set_desc_trans_id(desc, journal->j_trans_id); 4103 4104 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */ 4105 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 4106 ((journal->j_start + journal->j_len + 4107 1) % SB_ONDISK_JOURNAL_SIZE(sb))); 4108 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 4109 memset(c_bh->b_data, 0, c_bh->b_size); 4110 set_commit_trans_id(commit, journal->j_trans_id); 4111 set_buffer_uptodate(c_bh); 4112 4113 /* init this journal list */ 4114 jl = journal->j_current_jl; 4115 4116 /* we lock the commit before doing anything because 4117 * we want to make sure nobody tries to run flush_commit_list until 4118 * the new transaction is fully setup, and we've already flushed the 4119 * ordered bh list 4120 */ 4121 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb); 4122 4123 /* save the transaction id in case we need to commit it later */ 4124 commit_trans_id = jl->j_trans_id; 4125 4126 atomic_set(&jl->j_older_commits_done, 0); 4127 jl->j_trans_id = journal->j_trans_id; 4128 jl->j_timestamp = journal->j_trans_start_time; 4129 jl->j_commit_bh = c_bh; 4130 jl->j_start = journal->j_start; 4131 jl->j_len = journal->j_len; 4132 atomic_set(&jl->j_nonzerolen, journal->j_len); 4133 atomic_set(&jl->j_commit_left, journal->j_len + 2); 4134 jl->j_realblock = NULL; 4135 4136 /* The ENTIRE FOR LOOP MUST not cause schedule to occur. 4137 ** for each real block, add it to the journal list hash, 4138 ** copy into real block index array in the commit or desc block 4139 */ 4140 trans_half = journal_trans_half(sb->s_blocksize); 4141 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { 4142 if (buffer_journaled(cn->bh)) { 4143 jl_cn = get_cnode(sb); 4144 if (!jl_cn) { 4145 reiserfs_panic(sb, "journal-1676", 4146 "get_cnode returned NULL"); 4147 } 4148 if (i == 0) { 4149 jl->j_realblock = jl_cn; 4150 } 4151 jl_cn->prev = last_cn; 4152 jl_cn->next = NULL; 4153 if (last_cn) { 4154 last_cn->next = jl_cn; 4155 } 4156 last_cn = jl_cn; 4157 /* make sure the block we are trying to log is not a block 4158 of journal or reserved area */ 4159 4160 if (is_block_in_log_or_reserved_area 4161 (sb, cn->bh->b_blocknr)) { 4162 reiserfs_panic(sb, "journal-2332", 4163 "Trying to log block %lu, " 4164 "which is a log block", 4165 cn->bh->b_blocknr); 4166 } 4167 jl_cn->blocknr = cn->bh->b_blocknr; 4168 jl_cn->state = 0; 4169 jl_cn->sb = sb; 4170 jl_cn->bh = cn->bh; 4171 jl_cn->jlist = jl; 4172 insert_journal_hash(journal->j_list_hash_table, jl_cn); 4173 if (i < trans_half) { 4174 desc->j_realblock[i] = 4175 cpu_to_le32(cn->bh->b_blocknr); 4176 } else { 4177 commit->j_realblock[i - trans_half] = 4178 cpu_to_le32(cn->bh->b_blocknr); 4179 } 4180 } else { 4181 i--; 4182 } 4183 } 4184 set_desc_trans_len(desc, journal->j_len); 4185 set_desc_mount_id(desc, journal->j_mount_id); 4186 set_desc_trans_id(desc, journal->j_trans_id); 4187 set_commit_trans_len(commit, journal->j_len); 4188 4189 /* special check in case all buffers in the journal were marked for not logging */ 4190 BUG_ON(journal->j_len == 0); 4191 4192 /* we're about to dirty all the log blocks, mark the description block 4193 * dirty now too. Don't mark the commit block dirty until all the 4194 * others are on disk 4195 */ 4196 mark_buffer_dirty(d_bh); 4197 4198 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */ 4199 cur_write_start = journal->j_start; 4200 cn = journal->j_first; 4201 jindex = 1; /* start at one so we don't get the desc again */ 4202 while (cn) { 4203 clear_buffer_journal_new(cn->bh); 4204 /* copy all the real blocks into log area. dirty log blocks */ 4205 if (buffer_journaled(cn->bh)) { 4206 struct buffer_head *tmp_bh; 4207 char *addr; 4208 struct page *page; 4209 tmp_bh = 4210 journal_getblk(sb, 4211 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 4212 ((cur_write_start + 4213 jindex) % 4214 SB_ONDISK_JOURNAL_SIZE(sb))); 4215 set_buffer_uptodate(tmp_bh); 4216 page = cn->bh->b_page; 4217 addr = kmap(page); 4218 memcpy(tmp_bh->b_data, 4219 addr + offset_in_page(cn->bh->b_data), 4220 cn->bh->b_size); 4221 kunmap(page); 4222 mark_buffer_dirty(tmp_bh); 4223 jindex++; 4224 set_buffer_journal_dirty(cn->bh); 4225 clear_buffer_journaled(cn->bh); 4226 } else { 4227 /* JDirty cleared sometime during transaction. don't log this one */ 4228 reiserfs_warning(sb, "journal-2048", 4229 "BAD, buffer in journal hash, " 4230 "but not JDirty!"); 4231 brelse(cn->bh); 4232 } 4233 next = cn->next; 4234 free_cnode(sb, cn); 4235 cn = next; 4236 reiserfs_write_unlock(sb); 4237 cond_resched(); 4238 reiserfs_write_lock(sb); 4239 } 4240 4241 /* we are done with both the c_bh and d_bh, but 4242 ** c_bh must be written after all other commit blocks, 4243 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. 4244 */ 4245 4246 journal->j_current_jl = alloc_journal_list(sb); 4247 4248 /* now it is safe to insert this transaction on the main list */ 4249 list_add_tail(&jl->j_list, &journal->j_journal_list); 4250 list_add_tail(&jl->j_working_list, &journal->j_working_list); 4251 journal->j_num_work_lists++; 4252 4253 /* reset journal values for the next transaction */ 4254 old_start = journal->j_start; 4255 journal->j_start = 4256 (journal->j_start + journal->j_len + 4257 2) % SB_ONDISK_JOURNAL_SIZE(sb); 4258 atomic_set(&(journal->j_wcount), 0); 4259 journal->j_bcount = 0; 4260 journal->j_last = NULL; 4261 journal->j_first = NULL; 4262 journal->j_len = 0; 4263 journal->j_trans_start_time = 0; 4264 /* check for trans_id overflow */ 4265 if (++journal->j_trans_id == 0) 4266 journal->j_trans_id = 10; 4267 journal->j_current_jl->j_trans_id = journal->j_trans_id; 4268 journal->j_must_wait = 0; 4269 journal->j_len_alloc = 0; 4270 journal->j_next_full_flush = 0; 4271 journal->j_next_async_flush = 0; 4272 init_journal_hash(sb); 4273 4274 // make sure reiserfs_add_jh sees the new current_jl before we 4275 // write out the tails 4276 smp_mb(); 4277 4278 /* tail conversion targets have to hit the disk before we end the 4279 * transaction. Otherwise a later transaction might repack the tail 4280 * before this transaction commits, leaving the data block unflushed and 4281 * clean, if we crash before the later transaction commits, the data block 4282 * is lost. 4283 */ 4284 if (!list_empty(&jl->j_tail_bh_list)) { 4285 reiserfs_write_unlock(sb); 4286 write_ordered_buffers(&journal->j_dirty_buffers_lock, 4287 journal, jl, &jl->j_tail_bh_list); 4288 reiserfs_write_lock(sb); 4289 } 4290 BUG_ON(!list_empty(&jl->j_tail_bh_list)); 4291 mutex_unlock(&jl->j_commit_mutex); 4292 4293 /* honor the flush wishes from the caller, simple commits can 4294 ** be done outside the journal lock, they are done below 4295 ** 4296 ** if we don't flush the commit list right now, we put it into 4297 ** the work queue so the people waiting on the async progress work 4298 ** queue don't wait for this proc to flush journal lists and such. 4299 */ 4300 if (flush) { 4301 flush_commit_list(sb, jl, 1); 4302 flush_journal_list(sb, jl, 1); 4303 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) 4304 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10); 4305 4306 /* if the next transaction has any chance of wrapping, flush 4307 ** transactions that might get overwritten. If any journal lists are very 4308 ** old flush them as well. 4309 */ 4310 first_jl: 4311 list_for_each_safe(entry, safe, &journal->j_journal_list) { 4312 temp_jl = JOURNAL_LIST_ENTRY(entry); 4313 if (journal->j_start <= temp_jl->j_start) { 4314 if ((journal->j_start + journal->j_trans_max + 1) >= 4315 temp_jl->j_start) { 4316 flush_used_journal_lists(sb, temp_jl); 4317 goto first_jl; 4318 } else if ((journal->j_start + 4319 journal->j_trans_max + 1) < 4320 SB_ONDISK_JOURNAL_SIZE(sb)) { 4321 /* if we don't cross into the next transaction and we don't 4322 * wrap, there is no way we can overlap any later transactions 4323 * break now 4324 */ 4325 break; 4326 } 4327 } else if ((journal->j_start + 4328 journal->j_trans_max + 1) > 4329 SB_ONDISK_JOURNAL_SIZE(sb)) { 4330 if (((journal->j_start + journal->j_trans_max + 1) % 4331 SB_ONDISK_JOURNAL_SIZE(sb)) >= 4332 temp_jl->j_start) { 4333 flush_used_journal_lists(sb, temp_jl); 4334 goto first_jl; 4335 } else { 4336 /* we don't overlap anything from out start to the end of the 4337 * log, and our wrapped portion doesn't overlap anything at 4338 * the start of the log. We can break 4339 */ 4340 break; 4341 } 4342 } 4343 } 4344 flush_old_journal_lists(sb); 4345 4346 journal->j_current_jl->j_list_bitmap = 4347 get_list_bitmap(sb, journal->j_current_jl); 4348 4349 if (!(journal->j_current_jl->j_list_bitmap)) { 4350 reiserfs_panic(sb, "journal-1996", 4351 "could not get a list bitmap"); 4352 } 4353 4354 atomic_set(&(journal->j_jlock), 0); 4355 unlock_journal(sb); 4356 /* wake up any body waiting to join. */ 4357 clear_bit(J_WRITERS_QUEUED, &journal->j_state); 4358 wake_up(&(journal->j_join_wait)); 4359 4360 if (!flush && wait_on_commit && 4361 journal_list_still_alive(sb, commit_trans_id)) { 4362 flush_commit_list(sb, jl, 1); 4363 } 4364 out: 4365 reiserfs_check_lock_depth(sb, "journal end2"); 4366 4367 memset(th, 0, sizeof(*th)); 4368 /* Re-set th->t_super, so we can properly keep track of how many 4369 * persistent transactions there are. We need to do this so if this 4370 * call is part of a failed restart_transaction, we can free it later */ 4371 th->t_super = sb; 4372 4373 return journal->j_errno; 4374} 4375 4376/* Send the file system read only and refuse new transactions */ 4377void reiserfs_abort_journal(struct super_block *sb, int errno) 4378{ 4379 struct reiserfs_journal *journal = SB_JOURNAL(sb); 4380 if (test_bit(J_ABORTED, &journal->j_state)) 4381 return; 4382 4383 if (!journal->j_errno) 4384 journal->j_errno = errno; 4385 4386 sb->s_flags |= MS_RDONLY; 4387 set_bit(J_ABORTED, &journal->j_state); 4388 4389#ifdef CONFIG_REISERFS_CHECK 4390 dump_stack(); 4391#endif 4392} 4393