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