SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/reiserfs/journal.c

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