fs/reiserfs/journal.c

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