fs/reiserfs/journal.c

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