linux/fs/reiserfs/journal.c
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   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/* must be correct to keep the desc and commit structs at 4k */
  62#define JOURNAL_TRANS_HALF 1018
  63#define BUFNR 64                /*read ahead */
  64
  65/* cnode stat bits.  Move these into reiserfs_fs.h */
  66
  67/* this block was freed, and can't be written.  */
  68#define BLOCK_FREED 2
  69/* this block was freed during this transaction, and can't be written */
  70#define BLOCK_FREED_HOLDER 3
  71
  72/* used in flush_journal_list */
  73#define BLOCK_NEEDS_FLUSH 4
  74#define BLOCK_DIRTIED 5
  75
  76/* journal list state bits */
  77#define LIST_TOUCHED 1
  78#define LIST_DIRTY   2
  79#define LIST_COMMIT_PENDING  4  /* someone will commit this list */
  80
  81/* flags for do_journal_end */
  82#define FLUSH_ALL   1           /* flush commit and real blocks */
  83#define COMMIT_NOW  2           /* end and commit this transaction */
  84#define WAIT        4           /* wait for the log blocks to hit the disk */
  85
  86static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
  87static int flush_journal_list(struct super_block *s,
  88                              struct reiserfs_journal_list *jl, int flushall);
  89static int flush_commit_list(struct super_block *s,
  90                             struct reiserfs_journal_list *jl, int flushall);
  91static int can_dirty(struct reiserfs_journal_cnode *cn);
  92static int journal_join(struct reiserfs_transaction_handle *th,
  93                        struct super_block *sb);
  94static void release_journal_dev(struct super_block *super,
  95                               struct reiserfs_journal *journal);
  96static int dirty_one_transaction(struct super_block *s,
  97                                 struct reiserfs_journal_list *jl);
  98static void flush_async_commits(struct work_struct *work);
  99static void queue_log_writer(struct super_block *s);
 100
 101/* values for join in do_journal_begin_r */
 102enum {
 103        JBEGIN_REG = 0,         /* regular journal begin */
 104        /* join the running transaction if at all possible */
 105        JBEGIN_JOIN = 1,
 106        /* called from cleanup code, ignores aborted flag */
 107        JBEGIN_ABORT = 2,
 108};
 109
 110static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
 111                              struct super_block *sb,
 112                              unsigned long nblocks, int join);
 113
 114static void init_journal_hash(struct super_block *sb)
 115{
 116        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 117        memset(journal->j_hash_table, 0,
 118               JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
 119}
 120
 121/*
 122 * clears BH_Dirty and sticks the buffer on the clean list.  Called because
 123 * I can't allow refile_buffer to make schedule happen after I've freed a
 124 * block.  Look at remove_from_transaction and journal_mark_freed for
 125 * more details.
 126 */
 127static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
 128{
 129        if (bh) {
 130                clear_buffer_dirty(bh);
 131                clear_buffer_journal_test(bh);
 132        }
 133        return 0;
 134}
 135
 136static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
 137                                                         *sb)
 138{
 139        struct reiserfs_bitmap_node *bn;
 140        static int id;
 141
 142        bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
 143        if (!bn) {
 144                return NULL;
 145        }
 146        bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
 147        if (!bn->data) {
 148                kfree(bn);
 149                return NULL;
 150        }
 151        bn->id = id++;
 152        INIT_LIST_HEAD(&bn->list);
 153        return bn;
 154}
 155
 156static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
 157{
 158        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 159        struct reiserfs_bitmap_node *bn = NULL;
 160        struct list_head *entry = journal->j_bitmap_nodes.next;
 161
 162        journal->j_used_bitmap_nodes++;
 163repeat:
 164
 165        if (entry != &journal->j_bitmap_nodes) {
 166                bn = list_entry(entry, struct reiserfs_bitmap_node, list);
 167                list_del(entry);
 168                memset(bn->data, 0, sb->s_blocksize);
 169                journal->j_free_bitmap_nodes--;
 170                return bn;
 171        }
 172        bn = allocate_bitmap_node(sb);
 173        if (!bn) {
 174                yield();
 175                goto repeat;
 176        }
 177        return bn;
 178}
 179static inline void free_bitmap_node(struct super_block *sb,
 180                                    struct reiserfs_bitmap_node *bn)
 181{
 182        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 183        journal->j_used_bitmap_nodes--;
 184        if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
 185                kfree(bn->data);
 186                kfree(bn);
 187        } else {
 188                list_add(&bn->list, &journal->j_bitmap_nodes);
 189                journal->j_free_bitmap_nodes++;
 190        }
 191}
 192
 193static void allocate_bitmap_nodes(struct super_block *sb)
 194{
 195        int i;
 196        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 197        struct reiserfs_bitmap_node *bn = NULL;
 198        for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
 199                bn = allocate_bitmap_node(sb);
 200                if (bn) {
 201                        list_add(&bn->list, &journal->j_bitmap_nodes);
 202                        journal->j_free_bitmap_nodes++;
 203                } else {
 204                        /* this is ok, we'll try again when more are needed */
 205                        break;
 206                }
 207        }
 208}
 209
 210static int set_bit_in_list_bitmap(struct super_block *sb,
 211                                  b_blocknr_t block,
 212                                  struct reiserfs_list_bitmap *jb)
 213{
 214        unsigned int bmap_nr = block / (sb->s_blocksize << 3);
 215        unsigned int bit_nr = block % (sb->s_blocksize << 3);
 216
 217        if (!jb->bitmaps[bmap_nr]) {
 218                jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
 219        }
 220        set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
 221        return 0;
 222}
 223
 224static void cleanup_bitmap_list(struct super_block *sb,
 225                                struct reiserfs_list_bitmap *jb)
 226{
 227        int i;
 228        if (jb->bitmaps == NULL)
 229                return;
 230
 231        for (i = 0; i < reiserfs_bmap_count(sb); i++) {
 232                if (jb->bitmaps[i]) {
 233                        free_bitmap_node(sb, jb->bitmaps[i]);
 234                        jb->bitmaps[i] = NULL;
 235                }
 236        }
 237}
 238
 239/*
 240 * only call this on FS unmount.
 241 */
 242static int free_list_bitmaps(struct super_block *sb,
 243                             struct reiserfs_list_bitmap *jb_array)
 244{
 245        int i;
 246        struct reiserfs_list_bitmap *jb;
 247        for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 248                jb = jb_array + i;
 249                jb->journal_list = NULL;
 250                cleanup_bitmap_list(sb, jb);
 251                vfree(jb->bitmaps);
 252                jb->bitmaps = NULL;
 253        }
 254        return 0;
 255}
 256
 257static int free_bitmap_nodes(struct super_block *sb)
 258{
 259        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 260        struct list_head *next = journal->j_bitmap_nodes.next;
 261        struct reiserfs_bitmap_node *bn;
 262
 263        while (next != &journal->j_bitmap_nodes) {
 264                bn = list_entry(next, struct reiserfs_bitmap_node, list);
 265                list_del(next);
 266                kfree(bn->data);
 267                kfree(bn);
 268                next = journal->j_bitmap_nodes.next;
 269                journal->j_free_bitmap_nodes--;
 270        }
 271
 272        return 0;
 273}
 274
 275/*
 276 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
 277 * jb_array is the array to be filled in.
 278 */
 279int reiserfs_allocate_list_bitmaps(struct super_block *sb,
 280                                   struct reiserfs_list_bitmap *jb_array,
 281                                   unsigned int bmap_nr)
 282{
 283        int i;
 284        int failed = 0;
 285        struct reiserfs_list_bitmap *jb;
 286        int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
 287
 288        for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 289                jb = jb_array + i;
 290                jb->journal_list = NULL;
 291                jb->bitmaps = vzalloc(mem);
 292                if (!jb->bitmaps) {
 293                        reiserfs_warning(sb, "clm-2000", "unable to "
 294                                         "allocate bitmaps for journal lists");
 295                        failed = 1;
 296                        break;
 297                }
 298        }
 299        if (failed) {
 300                free_list_bitmaps(sb, jb_array);
 301                return -1;
 302        }
 303        return 0;
 304}
 305
 306/*
 307 * find an available list bitmap.  If you can't find one, flush a commit list
 308 * and try again
 309 */
 310static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
 311                                                    struct reiserfs_journal_list
 312                                                    *jl)
 313{
 314        int i, j;
 315        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 316        struct reiserfs_list_bitmap *jb = NULL;
 317
 318        for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
 319                i = journal->j_list_bitmap_index;
 320                journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
 321                jb = journal->j_list_bitmap + i;
 322                if (journal->j_list_bitmap[i].journal_list) {
 323                        flush_commit_list(sb,
 324                                          journal->j_list_bitmap[i].
 325                                          journal_list, 1);
 326                        if (!journal->j_list_bitmap[i].journal_list) {
 327                                break;
 328                        }
 329                } else {
 330                        break;
 331                }
 332        }
 333        /* double check to make sure if flushed correctly */
 334        if (jb->journal_list)
 335                return NULL;
 336        jb->journal_list = jl;
 337        return jb;
 338}
 339
 340/*
 341 * allocates a new chunk of X nodes, and links them all together as a list.
 342 * Uses the cnode->next and cnode->prev pointers
 343 * returns NULL on failure
 344 */
 345static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
 346{
 347        struct reiserfs_journal_cnode *head;
 348        int i;
 349        if (num_cnodes <= 0) {
 350                return NULL;
 351        }
 352        head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
 353        if (!head) {
 354                return NULL;
 355        }
 356        head[0].prev = NULL;
 357        head[0].next = head + 1;
 358        for (i = 1; i < num_cnodes; i++) {
 359                head[i].prev = head + (i - 1);
 360                head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
 361        }
 362        head[num_cnodes - 1].next = NULL;
 363        return head;
 364}
 365
 366/* pulls a cnode off the free list, or returns NULL on failure */
 367static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
 368{
 369        struct reiserfs_journal_cnode *cn;
 370        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 371
 372        reiserfs_check_lock_depth(sb, "get_cnode");
 373
 374        if (journal->j_cnode_free <= 0) {
 375                return NULL;
 376        }
 377        journal->j_cnode_used++;
 378        journal->j_cnode_free--;
 379        cn = journal->j_cnode_free_list;
 380        if (!cn) {
 381                return cn;
 382        }
 383        if (cn->next) {
 384                cn->next->prev = NULL;
 385        }
 386        journal->j_cnode_free_list = cn->next;
 387        memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
 388        return cn;
 389}
 390
 391/*
 392 * returns a cnode to the free list
 393 */
 394static void free_cnode(struct super_block *sb,
 395                       struct reiserfs_journal_cnode *cn)
 396{
 397        struct reiserfs_journal *journal = SB_JOURNAL(sb);
 398
 399        reiserfs_check_lock_depth(sb, "free_cnode");
 400
 401        journal->j_cnode_used--;
 402        journal->j_cnode_free++;
 403        /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
 404        cn->next = journal->j_cnode_free_list;
 405        if (journal->j_cnode_free_list) {
 406                journal->j_cnode_free_list->prev = cn;
 407        }
 408        cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
 409        journal->j_cnode_free_list = cn;
 410}
 411
 412static void clear_prepared_bits(struct buffer_head *bh)
 413{
 414        clear_buffer_journal_prepared(bh);
 415        clear_buffer_journal_restore_dirty(bh);
 416}
 417
 418/*
 419 * return a cnode with same dev, block number and size in table,
 420 * or null if not found
 421 */
 422static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
 423                                                                  super_block
 424                                                                  *sb,
 425                                                                  struct
 426                                                                  reiserfs_journal_cnode
 427                                                                  **table,
 428                                                                  long bl)
 429{
 430        struct reiserfs_journal_cnode *cn;
 431        cn = journal_hash(table, sb, bl);
 432        while (cn) {
 433                if (cn->blocknr == bl && cn->sb == sb)
 434                        return cn;
 435                cn = cn->hnext;
 436        }
 437        return (struct reiserfs_journal_cnode *)0;
 438}
 439
 440/*
 441 * this actually means 'can this block be reallocated yet?'.  If you set
 442 * search_all, a block can only be allocated if it is not in the current
 443 * transaction, was not freed by the current transaction, and has no chance
 444 * of ever 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
 447 * in the current transaction.  Since deleting a block removes it from the
 448 * current transaction, this case should never happen.  If you don't set
 449 * search_all, make sure you never write the block without logging it.
 450 *
 451 * next_zero_bit is a suggestion about the next block to try for find_forward.
 452 * when bl is rejected because it is set in a journal list bitmap, we search
 453 * for the next zero bit in the bitmap that rejected bl.  Then, we return
 454 * that through next_zero_bit for find_forward to try.
 455 *
 456 * Just because we return something in next_zero_bit does not mean we won't
 457 * reject it on the next call to reiserfs_in_journal
 458 */
 459int 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        /*
 473         * If we aren't doing a search_all, this is a metablock, and it
 474         * will be logged before use.  if we crash before the transaction
 475         * that freed it commits,  this transaction won't have committed
 476         * either, and the block will never be written
 477         */
 478        if (search_all) {
 479                for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 480                        PROC_INFO_INC(sb, journal.in_journal_bitmap);
 481                        jb = journal->j_list_bitmap + i;
 482                        if (jb->journal_list && jb->bitmaps[bmap_nr] &&
 483                            test_bit(bit_nr,
 484                                     (unsigned long *)jb->bitmaps[bmap_nr]->
 485                                     data)) {
 486                                *next_zero_bit =
 487                                    find_next_zero_bit((unsigned long *)
 488                                                       (jb->bitmaps[bmap_nr]->
 489                                                        data),
 490                                                       sb->s_blocksize << 3,
 491                                                       bit_nr + 1);
 492                                return 1;
 493                        }
 494                }
 495        }
 496
 497        bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
 498        /* is it in any old transactions? */
 499        if (search_all
 500            && (cn =
 501                get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
 502                return 1;
 503        }
 504
 505        /* is it in the current transaction.  This should never happen */
 506        if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
 507                BUG();
 508                return 1;
 509        }
 510
 511        PROC_INFO_INC(sb, journal.in_journal_reusable);
 512        /* safe for reuse */
 513        return 0;
 514}
 515
 516/* insert cn into table */
 517static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
 518                                       struct reiserfs_journal_cnode *cn)
 519{
 520        struct reiserfs_journal_cnode *cn_orig;
 521
 522        cn_orig = journal_hash(table, cn->sb, cn->blocknr);
 523        cn->hnext = cn_orig;
 524        cn->hprev = NULL;
 525        if (cn_orig) {
 526                cn_orig->hprev = cn;
 527        }
 528        journal_hash(table, cn->sb, cn->blocknr) = cn;
 529}
 530
 531/* lock the current transaction */
 532static inline void lock_journal(struct super_block *sb)
 533{
 534        PROC_INFO_INC(sb, journal.lock_journal);
 535
 536        reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
 537}
 538
 539/* unlock the current transaction */
 540static inline void unlock_journal(struct super_block *sb)
 541{
 542        mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
 543}
 544
 545static inline void get_journal_list(struct reiserfs_journal_list *jl)
 546{
 547        jl->j_refcount++;
 548}
 549
 550static inline void put_journal_list(struct super_block *s,
 551                                    struct reiserfs_journal_list *jl)
 552{
 553        if (jl->j_refcount < 1) {
 554                reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
 555                               jl->j_trans_id, jl->j_refcount);
 556        }
 557        if (--jl->j_refcount == 0)
 558                kfree(jl);
 559}
 560
 561/*
 562 * this used to be much more involved, and I'm keeping it just in case
 563 * things get ugly again.  it gets called by flush_commit_list, and
 564 * cleans up any data stored about blocks freed during a transaction.
 565 */
 566static void cleanup_freed_for_journal_list(struct super_block *sb,
 567                                           struct reiserfs_journal_list *jl)
 568{
 569
 570        struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
 571        if (jb) {
 572                cleanup_bitmap_list(sb, jb);
 573        }
 574        jl->j_list_bitmap->journal_list = NULL;
 575        jl->j_list_bitmap = NULL;
 576}
 577
 578static int journal_list_still_alive(struct super_block *s,
 579                                    unsigned int trans_id)
 580{
 581        struct reiserfs_journal *journal = SB_JOURNAL(s);
 582        struct list_head *entry = &journal->j_journal_list;
 583        struct reiserfs_journal_list *jl;
 584
 585        if (!list_empty(entry)) {
 586                jl = JOURNAL_LIST_ENTRY(entry->next);
 587                if (jl->j_trans_id <= trans_id) {
 588                        return 1;
 589                }
 590        }
 591        return 0;
 592}
 593
 594/*
 595 * If page->mapping was null, we failed to truncate this page for
 596 * some reason.  Most likely because it was truncated after being
 597 * logged via data=journal.
 598 *
 599 * This does a check to see if the buffer belongs to one of these
 600 * lost pages before doing the final put_bh.  If page->mapping was
 601 * null, it tries to free buffers on the page, which should make the
 602 * final put_page drop the page from the lru.
 603 */
 604static void release_buffer_page(struct buffer_head *bh)
 605{
 606        struct page *page = bh->b_page;
 607        if (!page->mapping && trylock_page(page)) {
 608                get_page(page);
 609                put_bh(bh);
 610                if (!page->mapping)
 611                        try_to_free_buffers(page);
 612                unlock_page(page);
 613                put_page(page);
 614        } else {
 615                put_bh(bh);
 616        }
 617}
 618
 619static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
 620{
 621        if (buffer_journaled(bh)) {
 622                reiserfs_warning(NULL, "clm-2084",
 623                                 "pinned buffer %lu:%pg sent to disk",
 624                                 bh->b_blocknr, bh->b_bdev);
 625        }
 626        if (uptodate)
 627                set_buffer_uptodate(bh);
 628        else
 629                clear_buffer_uptodate(bh);
 630
 631        unlock_buffer(bh);
 632        release_buffer_page(bh);
 633}
 634
 635static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
 636{
 637        if (uptodate)
 638                set_buffer_uptodate(bh);
 639        else
 640                clear_buffer_uptodate(bh);
 641        unlock_buffer(bh);
 642        put_bh(bh);
 643}
 644
 645static void submit_logged_buffer(struct buffer_head *bh)
 646{
 647        get_bh(bh);
 648        bh->b_end_io = reiserfs_end_buffer_io_sync;
 649        clear_buffer_journal_new(bh);
 650        clear_buffer_dirty(bh);
 651        if (!test_clear_buffer_journal_test(bh))
 652                BUG();
 653        if (!buffer_uptodate(bh))
 654                BUG();
 655        submit_bh(REQ_OP_WRITE, 0, bh);
 656}
 657
 658static void submit_ordered_buffer(struct buffer_head *bh)
 659{
 660        get_bh(bh);
 661        bh->b_end_io = reiserfs_end_ordered_io;
 662        clear_buffer_dirty(bh);
 663        if (!buffer_uptodate(bh))
 664                BUG();
 665        submit_bh(REQ_OP_WRITE, 0, bh);
 666}
 667
 668#define CHUNK_SIZE 32
 669struct buffer_chunk {
 670        struct buffer_head *bh[CHUNK_SIZE];
 671        int nr;
 672};
 673
 674static void write_chunk(struct buffer_chunk *chunk)
 675{
 676        int i;
 677        for (i = 0; i < chunk->nr; i++) {
 678                submit_logged_buffer(chunk->bh[i]);
 679        }
 680        chunk->nr = 0;
 681}
 682
 683static void write_ordered_chunk(struct buffer_chunk *chunk)
 684{
 685        int i;
 686        for (i = 0; i < chunk->nr; i++) {
 687                submit_ordered_buffer(chunk->bh[i]);
 688        }
 689        chunk->nr = 0;
 690}
 691
 692static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
 693                        spinlock_t * lock, void (fn) (struct buffer_chunk *))
 694{
 695        int ret = 0;
 696        BUG_ON(chunk->nr >= CHUNK_SIZE);
 697        chunk->bh[chunk->nr++] = bh;
 698        if (chunk->nr >= CHUNK_SIZE) {
 699                ret = 1;
 700                if (lock) {
 701                        spin_unlock(lock);
 702                        fn(chunk);
 703                        spin_lock(lock);
 704                } else {
 705                        fn(chunk);
 706                }
 707        }
 708        return ret;
 709}
 710
 711static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
 712static struct reiserfs_jh *alloc_jh(void)
 713{
 714        struct reiserfs_jh *jh;
 715        while (1) {
 716                jh = kmalloc(sizeof(*jh), GFP_NOFS);
 717                if (jh) {
 718                        atomic_inc(&nr_reiserfs_jh);
 719                        return jh;
 720                }
 721                yield();
 722        }
 723}
 724
 725/*
 726 * we want to free the jh when the buffer has been written
 727 * and waited on
 728 */
 729void reiserfs_free_jh(struct buffer_head *bh)
 730{
 731        struct reiserfs_jh *jh;
 732
 733        jh = bh->b_private;
 734        if (jh) {
 735                bh->b_private = NULL;
 736                jh->bh = NULL;
 737                list_del_init(&jh->list);
 738                kfree(jh);
 739                if (atomic_read(&nr_reiserfs_jh) <= 0)
 740                        BUG();
 741                atomic_dec(&nr_reiserfs_jh);
 742                put_bh(bh);
 743        }
 744}
 745
 746static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
 747                           int tail)
 748{
 749        struct reiserfs_jh *jh;
 750
 751        if (bh->b_private) {
 752                spin_lock(&j->j_dirty_buffers_lock);
 753                if (!bh->b_private) {
 754                        spin_unlock(&j->j_dirty_buffers_lock);
 755                        goto no_jh;
 756                }
 757                jh = bh->b_private;
 758                list_del_init(&jh->list);
 759        } else {
 760no_jh:
 761                get_bh(bh);
 762                jh = alloc_jh();
 763                spin_lock(&j->j_dirty_buffers_lock);
 764                /*
 765                 * buffer must be locked for __add_jh, should be able to have
 766                 * two adds at the same time
 767                 */
 768                BUG_ON(bh->b_private);
 769                jh->bh = bh;
 770                bh->b_private = jh;
 771        }
 772        jh->jl = j->j_current_jl;
 773        if (tail)
 774                list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
 775        else {
 776                list_add_tail(&jh->list, &jh->jl->j_bh_list);
 777        }
 778        spin_unlock(&j->j_dirty_buffers_lock);
 779        return 0;
 780}
 781
 782int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
 783{
 784        return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
 785}
 786int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
 787{
 788        return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
 789}
 790
 791#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
 792static int write_ordered_buffers(spinlock_t * lock,
 793                                 struct reiserfs_journal *j,
 794                                 struct reiserfs_journal_list *jl,
 795                                 struct list_head *list)
 796{
 797        struct buffer_head *bh;
 798        struct reiserfs_jh *jh;
 799        int ret = j->j_errno;
 800        struct buffer_chunk chunk;
 801        struct list_head tmp;
 802        INIT_LIST_HEAD(&tmp);
 803
 804        chunk.nr = 0;
 805        spin_lock(lock);
 806        while (!list_empty(list)) {
 807                jh = JH_ENTRY(list->next);
 808                bh = jh->bh;
 809                get_bh(bh);
 810                if (!trylock_buffer(bh)) {
 811                        if (!buffer_dirty(bh)) {
 812                                list_move(&jh->list, &tmp);
 813                                goto loop_next;
 814                        }
 815                        spin_unlock(lock);
 816                        if (chunk.nr)
 817                                write_ordered_chunk(&chunk);
 818                        wait_on_buffer(bh);
 819                        cond_resched();
 820                        spin_lock(lock);
 821                        goto loop_next;
 822                }
 823                /*
 824                 * in theory, dirty non-uptodate buffers should never get here,
 825                 * but the upper layer io error paths still have a few quirks.
 826                 * Handle them here as gracefully as we can
 827                 */
 828                if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
 829                        clear_buffer_dirty(bh);
 830                        ret = -EIO;
 831                }
 832                if (buffer_dirty(bh)) {
 833                        list_move(&jh->list, &tmp);
 834                        add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
 835                } else {
 836                        reiserfs_free_jh(bh);
 837                        unlock_buffer(bh);
 838                }
 839loop_next:
 840                put_bh(bh);
 841                cond_resched_lock(lock);
 842        }
 843        if (chunk.nr) {
 844                spin_unlock(lock);
 845                write_ordered_chunk(&chunk);
 846                spin_lock(lock);
 847        }
 848        while (!list_empty(&tmp)) {
 849                jh = JH_ENTRY(tmp.prev);
 850                bh = jh->bh;
 851                get_bh(bh);
 852                reiserfs_free_jh(bh);
 853
 854                if (buffer_locked(bh)) {
 855                        spin_unlock(lock);
 856                        wait_on_buffer(bh);
 857                        spin_lock(lock);
 858                }
 859                if (!buffer_uptodate(bh)) {
 860                        ret = -EIO;
 861                }
 862                /*
 863                 * ugly interaction with invalidatepage here.
 864                 * reiserfs_invalidate_page will pin any buffer that has a
 865                 * valid journal head from an older transaction.  If someone
 866                 * else sets our buffer dirty after we write it in the first
 867                 * loop, and then someone truncates the page away, nobody
 868                 * will ever write the buffer. We're safe if we write the
 869                 * page one last time after freeing the journal header.
 870                 */
 871                if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
 872                        spin_unlock(lock);
 873                        ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
 874                        spin_lock(lock);
 875                }
 876                put_bh(bh);
 877                cond_resched_lock(lock);
 878        }
 879        spin_unlock(lock);
 880        return ret;
 881}
 882
 883static int flush_older_commits(struct super_block *s,
 884                               struct reiserfs_journal_list *jl)
 885{
 886        struct reiserfs_journal *journal = SB_JOURNAL(s);
 887        struct reiserfs_journal_list *other_jl;
 888        struct reiserfs_journal_list *first_jl;
 889        struct list_head *entry;
 890        unsigned int trans_id = jl->j_trans_id;
 891        unsigned int other_trans_id;
 892        unsigned int first_trans_id;
 893
 894find_first:
 895        /*
 896         * first we walk backwards to find the oldest uncommitted transation
 897         */
 898        first_jl = jl;
 899        entry = jl->j_list.prev;
 900        while (1) {
 901                other_jl = JOURNAL_LIST_ENTRY(entry);
 902                if (entry == &journal->j_journal_list ||
 903                    atomic_read(&other_jl->j_older_commits_done))
 904                        break;
 905
 906                first_jl = other_jl;
 907                entry = other_jl->j_list.prev;
 908        }
 909
 910        /* if we didn't find any older uncommitted transactions, return now */
 911        if (first_jl == jl) {
 912                return 0;
 913        }
 914
 915        first_trans_id = first_jl->j_trans_id;
 916
 917        entry = &first_jl->j_list;
 918        while (1) {
 919                other_jl = JOURNAL_LIST_ENTRY(entry);
 920                other_trans_id = other_jl->j_trans_id;
 921
 922                if (other_trans_id < trans_id) {
 923                        if (atomic_read(&other_jl->j_commit_left) != 0) {
 924                                flush_commit_list(s, other_jl, 0);
 925
 926                                /* list we were called with is gone, return */
 927                                if (!journal_list_still_alive(s, trans_id))
 928                                        return 1;
 929
 930                                /*
 931                                 * the one we just flushed is gone, this means
 932                                 * all older lists are also gone, so first_jl
 933                                 * is no longer valid either.  Go back to the
 934                                 * beginning.
 935                                 */
 936                                if (!journal_list_still_alive
 937                                    (s, other_trans_id)) {
 938                                        goto find_first;
 939                                }
 940                        }
 941                        entry = entry->next;
 942                        if (entry == &journal->j_journal_list)
 943                                return 0;
 944                } else {
 945                        return 0;
 946                }
 947        }
 948        return 0;
 949}
 950
 951static int reiserfs_async_progress_wait(struct super_block *s)
 952{
 953        struct reiserfs_journal *j = SB_JOURNAL(s);
 954
 955        if (atomic_read(&j->j_async_throttle)) {
 956                int depth;
 957
 958                depth = reiserfs_write_unlock_nested(s);
 959                congestion_wait(BLK_RW_ASYNC, HZ / 10);
 960                reiserfs_write_lock_nested(s, depth);
 961        }
 962
 963        return 0;
 964}
 965
 966/*
 967 * if this journal list still has commit blocks unflushed, send them to disk.
 968 *
 969 * log areas must be flushed in order (transaction 2 can't commit before
 970 * transaction 1) Before the commit block can by written, every other log
 971 * block must be safely on disk
 972 */
 973static int flush_commit_list(struct super_block *s,
 974                             struct reiserfs_journal_list *jl, int flushall)
 975{
 976        int i;
 977        b_blocknr_t bn;
 978        struct buffer_head *tbh = NULL;
 979        unsigned int trans_id = jl->j_trans_id;
 980        struct reiserfs_journal *journal = SB_JOURNAL(s);
 981        int retval = 0;
 982        int write_len;
 983        int depth;
 984
 985        reiserfs_check_lock_depth(s, "flush_commit_list");
 986
 987        if (atomic_read(&jl->j_older_commits_done)) {
 988                return 0;
 989        }
 990
 991        /*
 992         * before we can put our commit blocks on disk, we have to make
 993         * sure everyone older than us is on disk too
 994         */
 995        BUG_ON(jl->j_len <= 0);
 996        BUG_ON(trans_id == journal->j_trans_id);
 997
 998        get_journal_list(jl);
 999        if (flushall) {
1000                if (flush_older_commits(s, jl) == 1) {
1001                        /*
1002                         * list disappeared during flush_older_commits.
1003                         * return
1004                         */
1005                        goto put_jl;
1006                }
1007        }
1008
1009        /* make sure nobody is trying to flush this one at the same time */
1010        reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1011
1012        if (!journal_list_still_alive(s, trans_id)) {
1013                mutex_unlock(&jl->j_commit_mutex);
1014                goto put_jl;
1015        }
1016        BUG_ON(jl->j_trans_id == 0);
1017
1018        /* this commit is done, exit */
1019        if (atomic_read(&jl->j_commit_left) <= 0) {
1020                if (flushall) {
1021                        atomic_set(&jl->j_older_commits_done, 1);
1022                }
1023                mutex_unlock(&jl->j_commit_mutex);
1024                goto put_jl;
1025        }
1026
1027        if (!list_empty(&jl->j_bh_list)) {
1028                int ret;
1029
1030                /*
1031                 * We might sleep in numerous places inside
1032                 * write_ordered_buffers. Relax the write lock.
1033                 */
1034                depth = reiserfs_write_unlock_nested(s);
1035                ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1036                                            journal, jl, &jl->j_bh_list);
1037                if (ret < 0 && retval == 0)
1038                        retval = ret;
1039                reiserfs_write_lock_nested(s, depth);
1040        }
1041        BUG_ON(!list_empty(&jl->j_bh_list));
1042        /*
1043         * for the description block and all the log blocks, submit any buffers
1044         * that haven't already reached the disk.  Try to write at least 256
1045         * log blocks. later on, we will only wait on blocks that correspond
1046         * to this transaction, but while we're unplugging we might as well
1047         * get a chunk of data on there.
1048         */
1049        atomic_inc(&journal->j_async_throttle);
1050        write_len = jl->j_len + 1;
1051        if (write_len < 256)
1052                write_len = 256;
1053        for (i = 0 ; i < write_len ; i++) {
1054                bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1055                    SB_ONDISK_JOURNAL_SIZE(s);
1056                tbh = journal_find_get_block(s, bn);
1057                if (tbh) {
1058                        if (buffer_dirty(tbh)) {
1059                            depth = reiserfs_write_unlock_nested(s);
1060                            ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1061                            reiserfs_write_lock_nested(s, depth);
1062                        }
1063                        put_bh(tbh) ;
1064                }
1065        }
1066        atomic_dec(&journal->j_async_throttle);
1067
1068        for (i = 0; i < (jl->j_len + 1); i++) {
1069                bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1070                    (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1071                tbh = journal_find_get_block(s, bn);
1072
1073                depth = reiserfs_write_unlock_nested(s);
1074                __wait_on_buffer(tbh);
1075                reiserfs_write_lock_nested(s, depth);
1076                /*
1077                 * since we're using ll_rw_blk above, it might have skipped
1078                 * over a locked buffer.  Double check here
1079                 */
1080                /* redundant, sync_dirty_buffer() checks */
1081                if (buffer_dirty(tbh)) {
1082                        depth = reiserfs_write_unlock_nested(s);
1083                        sync_dirty_buffer(tbh);
1084                        reiserfs_write_lock_nested(s, depth);
1085                }
1086                if (unlikely(!buffer_uptodate(tbh))) {
1087#ifdef CONFIG_REISERFS_CHECK
1088                        reiserfs_warning(s, "journal-601",
1089                                         "buffer write failed");
1090#endif
1091                        retval = -EIO;
1092                }
1093                /* once for journal_find_get_block */
1094                put_bh(tbh);
1095                /* once due to original getblk in do_journal_end */
1096                put_bh(tbh);
1097                atomic_dec(&jl->j_commit_left);
1098        }
1099
1100        BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1101
1102        /*
1103         * If there was a write error in the journal - we can't commit
1104         * this transaction - it will be invalid and, if successful,
1105         * will just end up propagating the write error out to
1106         * the file system.
1107         */
1108        if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1109                if (buffer_dirty(jl->j_commit_bh))
1110                        BUG();
1111                mark_buffer_dirty(jl->j_commit_bh) ;
1112                depth = reiserfs_write_unlock_nested(s);
1113                if (reiserfs_barrier_flush(s))
1114                        __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1115                else
1116                        sync_dirty_buffer(jl->j_commit_bh);
1117                reiserfs_write_lock_nested(s, depth);
1118        }
1119
1120        /*
1121         * If there was a write error in the journal - we can't commit this
1122         * transaction - it will be invalid and, if successful, will just end
1123         * up propagating the write error out to the filesystem.
1124         */
1125        if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1126#ifdef CONFIG_REISERFS_CHECK
1127                reiserfs_warning(s, "journal-615", "buffer write failed");
1128#endif
1129                retval = -EIO;
1130        }
1131        bforget(jl->j_commit_bh);
1132        if (journal->j_last_commit_id != 0 &&
1133            (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1134                reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1135                                 journal->j_last_commit_id, jl->j_trans_id);
1136        }
1137        journal->j_last_commit_id = jl->j_trans_id;
1138
1139        /*
1140         * now, every commit block is on the disk.  It is safe to allow
1141         * blocks freed during this transaction to be reallocated
1142         */
1143        cleanup_freed_for_journal_list(s, jl);
1144
1145        retval = retval ? retval : journal->j_errno;
1146
1147        /* mark the metadata dirty */
1148        if (!retval)
1149                dirty_one_transaction(s, jl);
1150        atomic_dec(&jl->j_commit_left);
1151
1152        if (flushall) {
1153                atomic_set(&jl->j_older_commits_done, 1);
1154        }
1155        mutex_unlock(&jl->j_commit_mutex);
1156put_jl:
1157        put_journal_list(s, jl);
1158
1159        if (retval)
1160                reiserfs_abort(s, retval, "Journal write error in %s",
1161                               __func__);
1162        return retval;
1163}
1164
1165/*
1166 * flush_journal_list frequently needs to find a newer transaction for a
1167 * given block.  This does that, or returns NULL if it can't find anything
1168 */
1169static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1170                                                          reiserfs_journal_cnode
1171                                                          *cn)
1172{
1173        struct super_block *sb = cn->sb;
1174        b_blocknr_t blocknr = cn->blocknr;
1175
1176        cn = cn->hprev;
1177        while (cn) {
1178                if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1179                        return cn->jlist;
1180                }
1181                cn = cn->hprev;
1182        }
1183        return NULL;
1184}
1185
1186static void remove_journal_hash(struct super_block *,
1187                                struct reiserfs_journal_cnode **,
1188                                struct reiserfs_journal_list *, unsigned long,
1189                                int);
1190
1191/*
1192 * once all the real blocks have been flushed, it is safe to remove them
1193 * from the journal list for this transaction.  Aside from freeing the
1194 * cnode, this also allows the block to be reallocated for data blocks
1195 * if it had been deleted.
1196 */
1197static void remove_all_from_journal_list(struct super_block *sb,
1198                                         struct reiserfs_journal_list *jl,
1199                                         int debug)
1200{
1201        struct reiserfs_journal *journal = SB_JOURNAL(sb);
1202        struct reiserfs_journal_cnode *cn, *last;
1203        cn = jl->j_realblock;
1204
1205        /*
1206         * which is better, to lock once around the whole loop, or
1207         * to lock for each call to remove_journal_hash?
1208         */
1209        while (cn) {
1210                if (cn->blocknr != 0) {
1211                        if (debug) {
1212                                reiserfs_warning(sb, "reiserfs-2201",
1213                                                 "block %u, bh is %d, state %ld",
1214                                                 cn->blocknr, cn->bh ? 1 : 0,
1215                                                 cn->state);
1216                        }
1217                        cn->state = 0;
1218                        remove_journal_hash(sb, journal->j_list_hash_table,
1219                                            jl, cn->blocknr, 1);
1220                }
1221                last = cn;
1222                cn = cn->next;
1223                free_cnode(sb, last);
1224        }
1225        jl->j_realblock = NULL;
1226}
1227
1228/*
1229 * if this timestamp is greater than the timestamp we wrote last to the
1230 * header block, write it to the header block.  once this is done, I can
1231 * safely say the log area for this transaction won't ever be replayed,
1232 * and I can start releasing blocks in this transaction for reuse as data
1233 * blocks.  called by flush_journal_list, before it calls
1234 * remove_all_from_journal_list
1235 */
1236static int _update_journal_header_block(struct super_block *sb,
1237                                        unsigned long offset,
1238                                        unsigned int trans_id)
1239{
1240        struct reiserfs_journal_header *jh;
1241        struct reiserfs_journal *journal = SB_JOURNAL(sb);
1242        int depth;
1243
1244        if (reiserfs_is_journal_aborted(journal))
1245                return -EIO;
1246
1247        if (trans_id >= journal->j_last_flush_trans_id) {
1248                if (buffer_locked((journal->j_header_bh))) {
1249                        depth = reiserfs_write_unlock_nested(sb);
1250                        __wait_on_buffer(journal->j_header_bh);
1251                        reiserfs_write_lock_nested(sb, depth);
1252                        if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1253#ifdef CONFIG_REISERFS_CHECK
1254                                reiserfs_warning(sb, "journal-699",
1255                                                 "buffer write failed");
1256#endif
1257                                return -EIO;
1258                        }
1259                }
1260                journal->j_last_flush_trans_id = trans_id;
1261                journal->j_first_unflushed_offset = offset;
1262                jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1263                                                        b_data);
1264                jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1265                jh->j_first_unflushed_offset = cpu_to_le32(offset);
1266                jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1267
1268                set_buffer_dirty(journal->j_header_bh);
1269                depth = reiserfs_write_unlock_nested(sb);
1270
1271                if (reiserfs_barrier_flush(sb))
1272                        __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1273                else
1274                        sync_dirty_buffer(journal->j_header_bh);
1275
1276                reiserfs_write_lock_nested(sb, depth);
1277                if (!buffer_uptodate(journal->j_header_bh)) {
1278                        reiserfs_warning(sb, "journal-837",
1279                                         "IO error during journal replay");
1280                        return -EIO;
1281                }
1282        }
1283        return 0;
1284}
1285
1286static int update_journal_header_block(struct super_block *sb,
1287                                       unsigned long offset,
1288                                       unsigned int trans_id)
1289{
1290        return _update_journal_header_block(sb, offset, trans_id);
1291}
1292
1293/*
1294** flush any and all journal lists older than you are
1295** can only be called from flush_journal_list
1296*/
1297static int flush_older_journal_lists(struct super_block *sb,
1298                                     struct reiserfs_journal_list *jl)
1299{
1300        struct list_head *entry;
1301        struct reiserfs_journal_list *other_jl;
1302        struct reiserfs_journal *journal = SB_JOURNAL(sb);
1303        unsigned int trans_id = jl->j_trans_id;
1304
1305        /*
1306         * we know we are the only ones flushing things, no extra race
1307         * protection is required.
1308         */
1309restart:
1310        entry = journal->j_journal_list.next;
1311        /* Did we wrap? */
1312        if (entry == &journal->j_journal_list)
1313                return 0;
1314        other_jl = JOURNAL_LIST_ENTRY(entry);
1315        if (other_jl->j_trans_id < trans_id) {
1316                BUG_ON(other_jl->j_refcount <= 0);
1317                /* do not flush all */
1318                flush_journal_list(sb, other_jl, 0);
1319
1320                /* other_jl is now deleted from the list */
1321                goto restart;
1322        }
1323        return 0;
1324}
1325
1326static void del_from_work_list(struct super_block *s,
1327                               struct reiserfs_journal_list *jl)
1328{
1329        struct reiserfs_journal *journal = SB_JOURNAL(s);
1330        if (!list_empty(&jl->j_working_list)) {
1331                list_del_init(&jl->j_working_list);
1332                journal->j_num_work_lists--;
1333        }
1334}
1335
1336/*
1337 * flush a journal list, both commit and real blocks
1338 *
1339 * always set flushall to 1, unless you are calling from inside
1340 * flush_journal_list
1341 *
1342 * IMPORTANT.  This can only be called while there are no journal writers,
1343 * and the journal is locked.  That means it can only be called from
1344 * do_journal_end, or by journal_release
1345 */
1346static int flush_journal_list(struct super_block *s,
1347                              struct reiserfs_journal_list *jl, int flushall)
1348{
1349        struct reiserfs_journal_list *pjl;
1350        struct reiserfs_journal_cnode *cn, *last;
1351        int count;
1352        int was_jwait = 0;
1353        int was_dirty = 0;
1354        struct buffer_head *saved_bh;
1355        unsigned long j_len_saved = jl->j_len;
1356        struct reiserfs_journal *journal = SB_JOURNAL(s);
1357        int err = 0;
1358        int depth;
1359
1360        BUG_ON(j_len_saved <= 0);
1361
1362        if (atomic_read(&journal->j_wcount) != 0) {
1363                reiserfs_warning(s, "clm-2048", "called with wcount %d",
1364                                 atomic_read(&journal->j_wcount));
1365        }
1366
1367        /* if flushall == 0, the lock is already held */
1368        if (flushall) {
1369                reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1370        } else if (mutex_trylock(&journal->j_flush_mutex)) {
1371                BUG();
1372        }
1373
1374        count = 0;
1375        if (j_len_saved > journal->j_trans_max) {
1376                reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1377                               j_len_saved, jl->j_trans_id);
1378                return 0;
1379        }
1380
1381        /* if all the work is already done, get out of here */
1382        if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1383            atomic_read(&jl->j_commit_left) <= 0) {
1384                goto flush_older_and_return;
1385        }
1386
1387        /*
1388         * start by putting the commit list on disk.  This will also flush
1389         * the commit lists of any olders transactions
1390         */
1391        flush_commit_list(s, jl, 1);
1392
1393        if (!(jl->j_state & LIST_DIRTY)
1394            && !reiserfs_is_journal_aborted(journal))
1395                BUG();
1396
1397        /* are we done now? */
1398        if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1399            atomic_read(&jl->j_commit_left) <= 0) {
1400                goto flush_older_and_return;
1401        }
1402
1403        /*
1404         * loop through each cnode, see if we need to write it,
1405         * or wait on a more recent transaction, or just ignore it
1406         */
1407        if (atomic_read(&journal->j_wcount) != 0) {
1408                reiserfs_panic(s, "journal-844", "journal list is flushing, "
1409                               "wcount is not 0");
1410        }
1411        cn = jl->j_realblock;
1412        while (cn) {
1413                was_jwait = 0;
1414                was_dirty = 0;
1415                saved_bh = NULL;
1416                /* blocknr of 0 is no longer in the hash, ignore it */
1417                if (cn->blocknr == 0) {
1418                        goto free_cnode;
1419                }
1420
1421                /*
1422                 * This transaction failed commit.
1423                 * Don't write out to the disk
1424                 */
1425                if (!(jl->j_state & LIST_DIRTY))
1426                        goto free_cnode;
1427
1428                pjl = find_newer_jl_for_cn(cn);
1429                /*
1430                 * the order is important here.  We check pjl to make sure we
1431                 * don't clear BH_JDirty_wait if we aren't the one writing this
1432                 * block to disk
1433                 */
1434                if (!pjl && cn->bh) {
1435                        saved_bh = cn->bh;
1436
1437                        /*
1438                         * we do this to make sure nobody releases the
1439                         * buffer while we are working with it
1440                         */
1441                        get_bh(saved_bh);
1442
1443                        if (buffer_journal_dirty(saved_bh)) {
1444                                BUG_ON(!can_dirty(cn));
1445                                was_jwait = 1;
1446                                was_dirty = 1;
1447                        } else if (can_dirty(cn)) {
1448                                /*
1449                                 * everything with !pjl && jwait
1450                                 * should be writable
1451                                 */
1452                                BUG();
1453                        }
1454                }
1455
1456                /*
1457                 * if someone has this block in a newer transaction, just make
1458                 * sure they are committed, and don't try writing it to disk
1459                 */
1460                if (pjl) {
1461                        if (atomic_read(&pjl->j_commit_left))
1462                                flush_commit_list(s, pjl, 1);
1463                        goto free_cnode;
1464                }
1465
1466                /*
1467                 * bh == NULL when the block got to disk on its own, OR,
1468                 * the block got freed in a future transaction
1469                 */
1470                if (saved_bh == NULL) {
1471                        goto free_cnode;
1472                }
1473
1474                /*
1475                 * this should never happen.  kupdate_one_transaction has
1476                 * this list locked while it works, so we should never see a
1477                 * buffer here that is not marked JDirty_wait
1478                 */
1479                if ((!was_jwait) && !buffer_locked(saved_bh)) {
1480                        reiserfs_warning(s, "journal-813",
1481                                         "BAD! buffer %llu %cdirty %cjwait, "
1482                                         "not in a newer tranasction",
1483                                         (unsigned long long)saved_bh->
1484                                         b_blocknr, was_dirty ? ' ' : '!',
1485                                         was_jwait ? ' ' : '!');
1486                }
1487                if (was_dirty) {
1488                        /*
1489                         * we inc again because saved_bh gets decremented
1490                         * at free_cnode
1491                         */
1492                        get_bh(saved_bh);
1493                        set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1494                        lock_buffer(saved_bh);
1495                        BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1496                        if (buffer_dirty(saved_bh))
1497                                submit_logged_buffer(saved_bh);
1498                        else
1499                                unlock_buffer(saved_bh);
1500                        count++;
1501                } else {
1502                        reiserfs_warning(s, "clm-2082",
1503                                         "Unable to flush buffer %llu in %s",
1504                                         (unsigned long long)saved_bh->
1505                                         b_blocknr, __func__);
1506                }
1507free_cnode:
1508                last = cn;
1509                cn = cn->next;
1510                if (saved_bh) {
1511                        /*
1512                         * we incremented this to keep others from
1513                         * taking the buffer head away
1514                         */
1515                        put_bh(saved_bh);
1516                        if (atomic_read(&saved_bh->b_count) < 0) {
1517                                reiserfs_warning(s, "journal-945",
1518                                                 "saved_bh->b_count < 0");
1519                        }
1520                }
1521        }
1522        if (count > 0) {
1523                cn = jl->j_realblock;
1524                while (cn) {
1525                        if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1526                                if (!cn->bh) {
1527                                        reiserfs_panic(s, "journal-1011",
1528                                                       "cn->bh is NULL");
1529                                }
1530
1531                                depth = reiserfs_write_unlock_nested(s);
1532                                __wait_on_buffer(cn->bh);
1533                                reiserfs_write_lock_nested(s, depth);
1534
1535                                if (!cn->bh) {
1536                                        reiserfs_panic(s, "journal-1012",
1537                                                       "cn->bh is NULL");
1538                                }
1539                                if (unlikely(!buffer_uptodate(cn->bh))) {
1540#ifdef CONFIG_REISERFS_CHECK
1541                                        reiserfs_warning(s, "journal-949",
1542                                                         "buffer write failed");
1543#endif
1544                                        err = -EIO;
1545                                }
1546                                /*
1547                                 * note, we must clear the JDirty_wait bit
1548                                 * after the up to date check, otherwise we
1549                                 * race against our flushpage routine
1550                                 */
1551                                BUG_ON(!test_clear_buffer_journal_dirty
1552                                       (cn->bh));
1553
1554                                /* drop one ref for us */
1555                                put_bh(cn->bh);
1556                                /* drop one ref for journal_mark_dirty */
1557                                release_buffer_page(cn->bh);
1558                        }
1559                        cn = cn->next;
1560                }
1561        }
1562
1563        if (err)
1564                reiserfs_abort(s, -EIO,
1565                               "Write error while pushing transaction to disk in %s",
1566                               __func__);
1567flush_older_and_return:
1568
1569        /*
1570         * before we can update the journal header block, we _must_ flush all
1571         * real blocks from all older transactions to disk.  This is because
1572         * once the header block is updated, this transaction will not be
1573         * replayed after a crash
1574         */
1575        if (flushall) {
1576                flush_older_journal_lists(s, jl);
1577        }
1578
1579        err = journal->j_errno;
1580        /*
1581         * before we can remove everything from the hash tables for this
1582         * transaction, we must make sure it can never be replayed
1583         *
1584         * since we are only called from do_journal_end, we know for sure there
1585         * are no allocations going on while we are flushing journal lists.  So,
1586         * we only need to update the journal header block for the last list
1587         * being flushed
1588         */
1589        if (!err && flushall) {
1590                err =
1591                    update_journal_header_block(s,
1592                                                (jl->j_start + jl->j_len +
1593                                                 2) % SB_ONDISK_JOURNAL_SIZE(s),
1594                                                jl->j_trans_id);
1595                if (err)
1596                        reiserfs_abort(s, -EIO,
1597                                       "Write error while updating journal header in %s",
1598                                       __func__);
1599        }
1600        remove_all_from_journal_list(s, jl, 0);
1601        list_del_init(&jl->j_list);
1602        journal->j_num_lists--;
1603        del_from_work_list(s, jl);
1604
1605        if (journal->j_last_flush_id != 0 &&
1606            (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1607                reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1608                                 journal->j_last_flush_id, jl->j_trans_id);
1609        }
1610        journal->j_last_flush_id = jl->j_trans_id;
1611
1612        /*
1613         * not strictly required since we are freeing the list, but it should
1614         * help find code using dead lists later on
1615         */
1616        jl->j_len = 0;
1617        atomic_set(&jl->j_nonzerolen, 0);
1618        jl->j_start = 0;
1619        jl->j_realblock = NULL;
1620        jl->j_commit_bh = NULL;
1621        jl->j_trans_id = 0;
1622        jl->j_state = 0;
1623        put_journal_list(s, jl);
1624        if (flushall)
1625                mutex_unlock(&journal->j_flush_mutex);
1626        return err;
1627}
1628
1629static int write_one_transaction(struct super_block *s,
1630                                 struct reiserfs_journal_list *jl,
1631                                 struct buffer_chunk *chunk)
1632{
1633        struct reiserfs_journal_cnode *cn;
1634        int ret = 0;
1635
1636        jl->j_state |= LIST_TOUCHED;
1637        del_from_work_list(s, jl);
1638        if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1639                return 0;
1640        }
1641
1642        cn = jl->j_realblock;
1643        while (cn) {
1644                /*
1645                 * if the blocknr == 0, this has been cleared from the hash,
1646                 * skip it
1647                 */
1648                if (cn->blocknr == 0) {
1649                        goto next;
1650                }
1651                if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1652                        struct buffer_head *tmp_bh;
1653                        /*
1654                         * we can race against journal_mark_freed when we try
1655                         * to lock_buffer(cn->bh), so we have to inc the buffer
1656                         * count, and recheck things after locking
1657                         */
1658                        tmp_bh = cn->bh;
1659                        get_bh(tmp_bh);
1660                        lock_buffer(tmp_bh);
1661                        if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1662                                if (!buffer_journal_dirty(tmp_bh) ||
1663                                    buffer_journal_prepared(tmp_bh))
1664                                        BUG();
1665                                add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1666                                ret++;
1667                        } else {
1668                                /* note, cn->bh might be null now */
1669                                unlock_buffer(tmp_bh);
1670                        }
1671                        put_bh(tmp_bh);
1672                }
1673next:
1674                cn = cn->next;
1675                cond_resched();
1676        }
1677        return ret;
1678}
1679
1680/* used by flush_commit_list */
1681static int dirty_one_transaction(struct super_block *s,
1682                                 struct reiserfs_journal_list *jl)
1683{
1684        struct reiserfs_journal_cnode *cn;
1685        struct reiserfs_journal_list *pjl;
1686        int ret = 0;
1687
1688        jl->j_state |= LIST_DIRTY;
1689        cn = jl->j_realblock;
1690        while (cn) {
1691                /*
1692                 * look for a more recent transaction that logged this
1693                 * buffer.  Only the most recent transaction with a buffer in
1694                 * it is allowed to send that buffer to disk
1695                 */
1696                pjl = find_newer_jl_for_cn(cn);
1697                if (!pjl && cn->blocknr && cn->bh
1698                    && buffer_journal_dirty(cn->bh)) {
1699                        BUG_ON(!can_dirty(cn));
1700                        /*
1701                         * if the buffer is prepared, it will either be logged
1702                         * or restored.  If restored, we need to make sure
1703                         * it actually gets marked dirty
1704                         */
1705                        clear_buffer_journal_new(cn->bh);
1706                        if (buffer_journal_prepared(cn->bh)) {
1707                                set_buffer_journal_restore_dirty(cn->bh);
1708                        } else {
1709                                set_buffer_journal_test(cn->bh);
1710                                mark_buffer_dirty(cn->bh);
1711                        }
1712                }
1713                cn = cn->next;
1714        }
1715        return ret;
1716}
1717
1718static int kupdate_transactions(struct super_block *s,
1719                                struct reiserfs_journal_list *jl,
1720                                struct reiserfs_journal_list **next_jl,
1721                                unsigned int *next_trans_id,
1722                                int num_blocks, int num_trans)
1723{
1724        int ret = 0;
1725        int written = 0;
1726        int transactions_flushed = 0;
1727        unsigned int orig_trans_id = jl->j_trans_id;
1728        struct buffer_chunk chunk;
1729        struct list_head *entry;
1730        struct reiserfs_journal *journal = SB_JOURNAL(s);
1731        chunk.nr = 0;
1732
1733        reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1734        if (!journal_list_still_alive(s, orig_trans_id)) {
1735                goto done;
1736        }
1737
1738        /*
1739         * we've got j_flush_mutex held, nobody is going to delete any
1740         * of these lists out from underneath us
1741         */
1742        while ((num_trans && transactions_flushed < num_trans) ||
1743               (!num_trans && written < num_blocks)) {
1744
1745                if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1746                    atomic_read(&jl->j_commit_left)
1747                    || !(jl->j_state & LIST_DIRTY)) {
1748                        del_from_work_list(s, jl);
1749                        break;
1750                }
1751                ret = write_one_transaction(s, jl, &chunk);
1752
1753                if (ret < 0)
1754                        goto done;
1755                transactions_flushed++;
1756                written += ret;
1757                entry = jl->j_list.next;
1758
1759                /* did we wrap? */
1760                if (entry == &journal->j_journal_list) {
1761                        break;
1762                }
1763                jl = JOURNAL_LIST_ENTRY(entry);
1764
1765                /* don't bother with older transactions */
1766                if (jl->j_trans_id <= orig_trans_id)
1767                        break;
1768        }
1769        if (chunk.nr) {
1770                write_chunk(&chunk);
1771        }
1772
1773done:
1774        mutex_unlock(&journal->j_flush_mutex);
1775        return ret;
1776}
1777
1778/*
1779 * for o_sync and fsync heavy applications, they tend to use
1780 * all the journa list slots with tiny transactions.  These
1781 * trigger lots and lots of calls to update the header block, which
1782 * adds seeks and slows things down.
1783 *
1784 * This function tries to clear out a large chunk of the journal lists
1785 * at once, which makes everything faster since only the newest journal
1786 * list updates the header block
1787 */
1788static int flush_used_journal_lists(struct super_block *s,
1789                                    struct reiserfs_journal_list *jl)
1790{
1791        unsigned long len = 0;
1792        unsigned long cur_len;
1793        int ret;
1794        int i;
1795        int limit = 256;
1796        struct reiserfs_journal_list *tjl;
1797        struct reiserfs_journal_list *flush_jl;
1798        unsigned int trans_id;
1799        struct reiserfs_journal *journal = SB_JOURNAL(s);
1800
1801        flush_jl = tjl = jl;
1802
1803        /* in data logging mode, try harder to flush a lot of blocks */
1804        if (reiserfs_data_log(s))
1805                limit = 1024;
1806        /* flush for 256 transactions or limit blocks, whichever comes first */
1807        for (i = 0; i < 256 && len < limit; i++) {
1808                if (atomic_read(&tjl->j_commit_left) ||
1809                    tjl->j_trans_id < jl->j_trans_id) {
1810                        break;
1811                }
1812                cur_len = atomic_read(&tjl->j_nonzerolen);
1813                if (cur_len > 0) {
1814                        tjl->j_state &= ~LIST_TOUCHED;
1815                }
1816                len += cur_len;
1817                flush_jl = tjl;
1818                if (tjl->j_list.next == &journal->j_journal_list)
1819                        break;
1820                tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1821        }
1822        get_journal_list(jl);
1823        get_journal_list(flush_jl);
1824
1825        /*
1826         * try to find a group of blocks we can flush across all the
1827         * transactions, but only bother if we've actually spanned
1828         * across multiple lists
1829         */
1830        if (flush_jl != jl) {
1831                ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1832        }
1833        flush_journal_list(s, flush_jl, 1);
1834        put_journal_list(s, flush_jl);
1835        put_journal_list(s, jl);
1836        return 0;
1837}
1838
1839/*
1840 * removes any nodes in table with name block and dev as bh.
1841 * only touchs the hnext and hprev pointers.
1842 */
1843void remove_journal_hash(struct super_block *sb,
1844                         struct reiserfs_journal_cnode **table,
1845                         struct reiserfs_journal_list *jl,
1846                         unsigned long block, int remove_freed)
1847{
1848        struct reiserfs_journal_cnode *cur;
1849        struct reiserfs_journal_cnode **head;
1850
1851        head = &(journal_hash(table, sb, block));
1852        if (!head) {
1853                return;
1854        }
1855        cur = *head;
1856        while (cur) {
1857                if (cur->blocknr == block && cur->sb == sb
1858                    && (jl == NULL || jl == cur->jlist)
1859                    && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1860                        if (cur->hnext) {
1861                                cur->hnext->hprev = cur->hprev;
1862                        }
1863                        if (cur->hprev) {
1864                                cur->hprev->hnext = cur->hnext;
1865                        } else {
1866                                *head = cur->hnext;
1867                        }
1868                        cur->blocknr = 0;
1869                        cur->sb = NULL;
1870                        cur->state = 0;
1871                        /*
1872                         * anybody who clears the cur->bh will also
1873                         * dec the nonzerolen
1874                         */
1875                        if (cur->bh && cur->jlist)
1876                                atomic_dec(&cur->jlist->j_nonzerolen);
1877                        cur->bh = NULL;
1878                        cur->jlist = NULL;
1879                }
1880                cur = cur->hnext;
1881        }
1882}
1883
1884static void free_journal_ram(struct super_block *sb)
1885{
1886        struct reiserfs_journal *journal = SB_JOURNAL(sb);
1887        kfree(journal->j_current_jl);
1888        journal->j_num_lists--;
1889
1890        vfree(journal->j_cnode_free_orig);
1891        free_list_bitmaps(sb, journal->j_list_bitmap);
1892        free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1893        if (journal->j_header_bh) {
1894                brelse(journal->j_header_bh);
1895        }
1896        /*
1897         * j_header_bh is on the journal dev, make sure
1898         * not to release the journal dev until we brelse j_header_bh
1899         */
1900        release_journal_dev(sb, journal);
1901        vfree(journal);
1902}
1903
1904/*
1905 * call on unmount.  Only set error to 1 if you haven't made your way out
1906 * of read_super() yet.  Any other caller must keep error at 0.
1907 */
1908static int do_journal_release(struct reiserfs_transaction_handle *th,
1909                              struct super_block *sb, int error)
1910{
1911        struct reiserfs_transaction_handle myth;
1912        int flushed = 0;
1913        struct reiserfs_journal *journal = SB_JOURNAL(sb);
1914
1915        /*
1916         * we only want to flush out transactions if we were
1917         * called with error == 0
1918         */
1919        if (!error && !(sb->s_flags & MS_RDONLY)) {
1920                /* end the current trans */
1921                BUG_ON(!th->t_trans_id);
1922                do_journal_end(th, FLUSH_ALL);
1923
1924                /*
1925                 * make sure something gets logged to force
1926                 * our way into the flush code
1927                 */
1928                if (!journal_join(&myth, sb)) {
1929                        reiserfs_prepare_for_journal(sb,
1930                                                     SB_BUFFER_WITH_SB(sb),
1931                                                     1);
1932                        journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1933                        do_journal_end(&myth, FLUSH_ALL);
1934                        flushed = 1;
1935                }
1936        }
1937
1938        /* this also catches errors during the do_journal_end above */
1939        if (!error && reiserfs_is_journal_aborted(journal)) {
1940                memset(&myth, 0, sizeof(myth));
1941                if (!journal_join_abort(&myth, sb)) {
1942                        reiserfs_prepare_for_journal(sb,
1943                                                     SB_BUFFER_WITH_SB(sb),
1944                                                     1);
1945                        journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1946                        do_journal_end(&myth, FLUSH_ALL);
1947                }
1948        }
1949
1950
1951        /*
1952         * We must release the write lock here because
1953         * the workqueue job (flush_async_commit) needs this lock
1954         */
1955        reiserfs_write_unlock(sb);
1956
1957        /*
1958         * Cancel flushing of old commits. Note that neither of these works
1959         * will be requeued because superblock is being shutdown and doesn't
1960         * have MS_ACTIVE set.
1961         */
1962        cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
1963        /* wait for all commits to finish */
1964        cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1965
1966        free_journal_ram(sb);
1967
1968        reiserfs_write_lock(sb);
1969
1970        return 0;
1971}
1972
1973/* * call on unmount.  flush all journal trans, release all alloc'd ram */
1974int journal_release(struct reiserfs_transaction_handle *th,
1975                    struct super_block *sb)
1976{
1977        return do_journal_release(th, sb, 0);
1978}
1979
1980/* only call from an error condition inside reiserfs_read_super!  */
1981int journal_release_error(struct reiserfs_transaction_handle *th,
1982                          struct super_block *sb)
1983{
1984        return do_journal_release(th, sb, 1);
1985}
1986
1987/*
1988 * compares description block with commit block.
1989 * returns 1 if they differ, 0 if they are the same
1990 */
1991static int journal_compare_desc_commit(struct super_block *sb,
1992                                       struct reiserfs_journal_desc *desc,
1993                                       struct reiserfs_journal_commit *commit)
1994{
1995        if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1996            get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1997            get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1998            get_commit_trans_len(commit) <= 0) {
1999                return 1;
2000        }
2001        return 0;
2002}
2003
2004/*
2005 * returns 0 if it did not find a description block
2006 * returns -1 if it found a corrupt commit block
2007 * returns 1 if both desc and commit were valid
2008 * NOTE: only called during fs mount
2009 */
2010static int journal_transaction_is_valid(struct super_block *sb,
2011                                        struct buffer_head *d_bh,
2012                                        unsigned int *oldest_invalid_trans_id,
2013                                        unsigned long *newest_mount_id)
2014{
2015        struct reiserfs_journal_desc *desc;
2016        struct reiserfs_journal_commit *commit;
2017        struct buffer_head *c_bh;
2018        unsigned long offset;
2019
2020        if (!d_bh)
2021                return 0;
2022
2023        desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2024        if (get_desc_trans_len(desc) > 0
2025            && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2026                if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2027                    && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2028                        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2029                                       "journal-986: transaction "
2030                                       "is valid returning because trans_id %d is greater than "
2031                                       "oldest_invalid %lu",
2032                                       get_desc_trans_id(desc),
2033                                       *oldest_invalid_trans_id);
2034                        return 0;
2035                }
2036                if (newest_mount_id
2037                    && *newest_mount_id > get_desc_mount_id(desc)) {
2038                        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2039                                       "journal-1087: transaction "
2040                                       "is valid returning because mount_id %d is less than "
2041                                       "newest_mount_id %lu",
2042                                       get_desc_mount_id(desc),
2043                                       *newest_mount_id);
2044                        return -1;
2045                }
2046                if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2047                        reiserfs_warning(sb, "journal-2018",
2048                                         "Bad transaction length %d "
2049                                         "encountered, ignoring transaction",
2050                                         get_desc_trans_len(desc));
2051                        return -1;
2052                }
2053                offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2054
2055                /*
2056                 * ok, we have a journal description block,
2057                 * let's see if the transaction was valid
2058                 */
2059                c_bh =
2060                    journal_bread(sb,
2061                                  SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2062                                  ((offset + get_desc_trans_len(desc) +
2063                                    1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2064                if (!c_bh)
2065                        return 0;
2066                commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2067                if (journal_compare_desc_commit(sb, desc, commit)) {
2068                        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2069                                       "journal_transaction_is_valid, commit offset %ld had bad "
2070                                       "time %d or length %d",
2071                                       c_bh->b_blocknr -
2072                                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2073                                       get_commit_trans_id(commit),
2074                                       get_commit_trans_len(commit));
2075                        brelse(c_bh);
2076                        if (oldest_invalid_trans_id) {
2077                                *oldest_invalid_trans_id =
2078                                    get_desc_trans_id(desc);
2079                                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2080                                               "journal-1004: "
2081                                               "transaction_is_valid setting oldest invalid trans_id "
2082                                               "to %d",
2083                                               get_desc_trans_id(desc));
2084                        }
2085                        return -1;
2086                }
2087                brelse(c_bh);
2088                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2089                               "journal-1006: found valid "
2090                               "transaction start offset %llu, len %d id %d",
2091                               d_bh->b_blocknr -
2092                               SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2093                               get_desc_trans_len(desc),
2094                               get_desc_trans_id(desc));
2095                return 1;
2096        } else {
2097                return 0;
2098        }
2099}
2100
2101static void brelse_array(struct buffer_head **heads, int num)
2102{
2103        int i;
2104        for (i = 0; i < num; i++) {
2105                brelse(heads[i]);
2106        }
2107}
2108
2109/*
2110 * given the start, and values for the oldest acceptable transactions,
2111 * this either reads in a replays a transaction, or returns because the
2112 * transaction is invalid, or too old.
2113 * NOTE: only called during fs mount
2114 */
2115static int journal_read_transaction(struct super_block *sb,
2116                                    unsigned long cur_dblock,
2117                                    unsigned long oldest_start,
2118                                    unsigned int oldest_trans_id,
2119                                    unsigned long newest_mount_id)
2120{
2121        struct reiserfs_journal *journal = SB_JOURNAL(sb);
2122        struct reiserfs_journal_desc *desc;
2123        struct reiserfs_journal_commit *commit;
2124        unsigned int trans_id = 0;
2125        struct buffer_head *c_bh;
2126        struct buffer_head *d_bh;
2127        struct buffer_head **log_blocks = NULL;
2128        struct buffer_head **real_blocks = NULL;
2129        unsigned int trans_offset;
2130        int i;
2131        int trans_half;
2132
2133        d_bh = journal_bread(sb, cur_dblock);
2134        if (!d_bh)
2135                return 1;
2136        desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2137        trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2138        reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2139                       "journal_read_transaction, offset %llu, len %d mount_id %d",
2140                       d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2141                       get_desc_trans_len(desc), get_desc_mount_id(desc));
2142        if (get_desc_trans_id(desc) < oldest_trans_id) {
2143                reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2144                               "journal_read_trans skipping because %lu is too old",
2145                               cur_dblock -
2146                               SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2147                brelse(d_bh);
2148                return 1;
2149        }
2150        if (get_desc_mount_id(desc) != newest_mount_id) {
2151                reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2152                               "journal_read_trans skipping because %d is != "
2153                               "newest_mount_id %lu", get_desc_mount_id(desc),
2154                               newest_mount_id);
2155                brelse(d_bh);
2156                return 1;
2157        }
2158        c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2159                             ((trans_offset + get_desc_trans_len(desc) + 1) %
2160                              SB_ONDISK_JOURNAL_SIZE(sb)));
2161        if (!c_bh) {
2162                brelse(d_bh);
2163                return 1;
2164        }
2165        commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2166        if (journal_compare_desc_commit(sb, desc, commit)) {
2167                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2168                               "journal_read_transaction, "
2169                               "commit offset %llu had bad time %d or length %d",
2170                               c_bh->b_blocknr -
2171                               SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2172                               get_commit_trans_id(commit),
2173                               get_commit_trans_len(commit));
2174                brelse(c_bh);
2175                brelse(d_bh);
2176                return 1;
2177        }
2178
2179        if (bdev_read_only(sb->s_bdev)) {
2180                reiserfs_warning(sb, "clm-2076",
2181                                 "device is readonly, unable to replay log");
2182                brelse(c_bh);
2183                brelse(d_bh);
2184                return -EROFS;
2185        }
2186
2187        trans_id = get_desc_trans_id(desc);
2188        /*
2189         * now we know we've got a good transaction, and it was
2190         * inside the valid time ranges
2191         */
2192        log_blocks = kmalloc(get_desc_trans_len(desc) *
2193                             sizeof(struct buffer_head *), GFP_NOFS);
2194        real_blocks = kmalloc(get_desc_trans_len(desc) *
2195                              sizeof(struct buffer_head *), GFP_NOFS);
2196        if (!log_blocks || !real_blocks) {
2197                brelse(c_bh);
2198                brelse(d_bh);
2199                kfree(log_blocks);
2200                kfree(real_blocks);
2201                reiserfs_warning(sb, "journal-1169",
2202                                 "kmalloc failed, unable to mount FS");
2203                return -1;
2204        }
2205        /* get all the buffer heads */
2206        trans_half = journal_trans_half(sb->s_blocksize);
2207        for (i = 0; i < get_desc_trans_len(desc); i++) {
2208                log_blocks[i] =
2209                    journal_getblk(sb,
2210                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2211                                   (trans_offset + 1 +
2212                                    i) % SB_ONDISK_JOURNAL_SIZE(sb));
2213                if (i < trans_half) {
2214                        real_blocks[i] =
2215                            sb_getblk(sb,
2216                                      le32_to_cpu(desc->j_realblock[i]));
2217                } else {
2218                        real_blocks[i] =
2219                            sb_getblk(sb,
2220                                      le32_to_cpu(commit->
2221                                                  j_realblock[i - trans_half]));
2222                }
2223                if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2224                        reiserfs_warning(sb, "journal-1207",
2225                                         "REPLAY FAILURE fsck required! "
2226                                         "Block to replay is outside of "
2227                                         "filesystem");
2228                        goto abort_replay;
2229                }
2230                /* make sure we don't try to replay onto log or reserved area */
2231                if (is_block_in_log_or_reserved_area
2232                    (sb, real_blocks[i]->b_blocknr)) {
2233                        reiserfs_warning(sb, "journal-1204",
2234                                         "REPLAY FAILURE fsck required! "
2235                                         "Trying to replay onto a log block");
2236abort_replay:
2237                        brelse_array(log_blocks, i);
2238                        brelse_array(real_blocks, i);
2239                        brelse(c_bh);
2240                        brelse(d_bh);
2241                        kfree(log_blocks);
2242                        kfree(real_blocks);
2243                        return -1;
2244                }
2245        }
2246        /* read in the log blocks, memcpy to the corresponding real block */
2247        ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2248        for (i = 0; i < get_desc_trans_len(desc); i++) {
2249
2250                wait_on_buffer(log_blocks[i]);
2251                if (!buffer_uptodate(log_blocks[i])) {
2252                        reiserfs_warning(sb, "journal-1212",
2253                                         "REPLAY FAILURE fsck required! "
2254                                         "buffer write failed");
2255                        brelse_array(log_blocks + i,
2256                                     get_desc_trans_len(desc) - i);
2257                        brelse_array(real_blocks, get_desc_trans_len(desc));
2258                        brelse(c_bh);
2259                        brelse(d_bh);
2260                        kfree(log_blocks);
2261                        kfree(real_blocks);
2262                        return -1;
2263                }
2264                memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2265                       real_blocks[i]->b_size);
2266                set_buffer_uptodate(real_blocks[i]);
2267                brelse(log_blocks[i]);
2268        }
2269        /* flush out the real blocks */
2270        for (i = 0; i < get_desc_trans_len(desc); i++) {
2271                set_buffer_dirty(real_blocks[i]);
2272                write_dirty_buffer(real_blocks[i], 0);
2273        }
2274        for (i = 0; i < get_desc_trans_len(desc); i++) {
2275                wait_on_buffer(real_blocks[i]);
2276                if (!buffer_uptodate(real_blocks[i])) {
2277                        reiserfs_warning(sb, "journal-1226",
2278                                         "REPLAY FAILURE, fsck required! "
2279                                         "buffer write failed");
2280                        brelse_array(real_blocks + i,
2281                                     get_desc_trans_len(desc) - i);
2282                        brelse(c_bh);
2283                        brelse(d_bh);
2284                        kfree(log_blocks);
2285                        kfree(real_blocks);
2286                        return -1;
2287                }
2288                brelse(real_blocks[i]);
2289        }
2290        cur_dblock =
2291            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2292            ((trans_offset + get_desc_trans_len(desc) +
2293              2) % SB_ONDISK_JOURNAL_SIZE(sb));
2294        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2295                       "journal-1095: setting journal " "start to offset %ld",
2296                       cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2297
2298        /*
2299         * init starting values for the first transaction, in case
2300         * this is the last transaction to be replayed.
2301         */
2302        journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2303        journal->j_last_flush_trans_id = trans_id;
2304        journal->j_trans_id = trans_id + 1;
2305        /* check for trans_id overflow */
2306        if (journal->j_trans_id == 0)
2307                journal->j_trans_id = 10;
2308        brelse(c_bh);
2309        brelse(d_bh);
2310        kfree(log_blocks);
2311        kfree(real_blocks);
2312        return 0;
2313}
2314
2315/*
2316 * This function reads blocks starting from block and to max_block of bufsize
2317 * size (but no more than BUFNR blocks at a time). This proved to improve
2318 * mounting speed on self-rebuilding raid5 arrays at least.
2319 * Right now it is only used from journal code. But later we might use it
2320 * from other places.
2321 * Note: Do not use journal_getblk/sb_getblk functions here!
2322 */
2323static struct buffer_head *reiserfs_breada(struct block_device *dev,
2324                                           b_blocknr_t block, int bufsize,
2325                                           b_blocknr_t max_block)
2326{
2327        struct buffer_head *bhlist[BUFNR];
2328        unsigned int blocks = BUFNR;
2329        struct buffer_head *bh;
2330        int i, j;
2331
2332        bh = __getblk(dev, block, bufsize);
2333        if (buffer_uptodate(bh))
2334                return (bh);
2335
2336        if (block + BUFNR > max_block) {
2337                blocks = max_block - block;
2338        }
2339        bhlist[0] = bh;
2340        j = 1;
2341        for (i = 1; i < blocks; i++) {
2342                bh = __getblk(dev, block + i, bufsize);
2343                if (buffer_uptodate(bh)) {
2344                        brelse(bh);
2345                        break;
2346                } else
2347                        bhlist[j++] = bh;
2348        }
2349        ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2350        for (i = 1; i < j; i++)
2351                brelse(bhlist[i]);
2352        bh = bhlist[0];
2353        wait_on_buffer(bh);
2354        if (buffer_uptodate(bh))
2355                return bh;
2356        brelse(bh);
2357        return NULL;
2358}
2359
2360/*
2361 * read and replay the log
2362 * on a clean unmount, the journal header's next unflushed pointer will be
2363 * to an invalid transaction.  This tests that before finding all the
2364 * transactions in the log, which makes normal mount times fast.
2365 *
2366 * After a crash, this starts with the next unflushed transaction, and
2367 * replays until it finds one too old, or invalid.
2368 *
2369 * On exit, it sets things up so the first transaction will work correctly.
2370 * NOTE: only called during fs mount
2371 */
2372static int journal_read(struct super_block *sb)
2373{
2374        struct reiserfs_journal *journal = SB_JOURNAL(sb);
2375        struct reiserfs_journal_desc *desc;
2376        unsigned int oldest_trans_id = 0;
2377        unsigned int oldest_invalid_trans_id = 0;
2378        time_t start;
2379        unsigned long oldest_start = 0;
2380        unsigned long cur_dblock = 0;
2381        unsigned long newest_mount_id = 9;
2382        struct buffer_head *d_bh;
2383        struct reiserfs_journal_header *jh;
2384        int valid_journal_header = 0;
2385        int replay_count = 0;
2386        int continue_replay = 1;
2387        int ret;
2388
2389        cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2390        reiserfs_info(sb, "checking transaction log (%pg)\n",
2391                      journal->j_dev_bd);
2392        start = get_seconds();
2393
2394        /*
2395         * step 1, read in the journal header block.  Check the transaction
2396         * it says is the first unflushed, and if that transaction is not
2397         * valid, replay is done
2398         */
2399        journal->j_header_bh = journal_bread(sb,
2400                                             SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2401                                             + SB_ONDISK_JOURNAL_SIZE(sb));
2402        if (!journal->j_header_bh) {
2403                return 1;
2404        }
2405        jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2406        if (le32_to_cpu(jh->j_first_unflushed_offset) <
2407            SB_ONDISK_JOURNAL_SIZE(sb)
2408            && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2409                oldest_start =
2410                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2411                    le32_to_cpu(jh->j_first_unflushed_offset);
2412                oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2413                newest_mount_id = le32_to_cpu(jh->j_mount_id);
2414                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2415                               "journal-1153: found in "
2416                               "header: first_unflushed_offset %d, last_flushed_trans_id "
2417                               "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2418                               le32_to_cpu(jh->j_last_flush_trans_id));
2419                valid_journal_header = 1;
2420
2421                /*
2422                 * now, we try to read the first unflushed offset.  If it
2423                 * is not valid, there is nothing more we can do, and it
2424                 * makes no sense to read through the whole log.
2425                 */
2426                d_bh =
2427                    journal_bread(sb,
2428                                  SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2429                                  le32_to_cpu(jh->j_first_unflushed_offset));
2430                ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2431                if (!ret) {
2432                        continue_replay = 0;
2433                }
2434                brelse(d_bh);
2435                goto start_log_replay;
2436        }
2437
2438        /*
2439         * ok, there are transactions that need to be replayed.  start
2440         * with the first log block, find all the valid transactions, and
2441         * pick out the oldest.
2442         */
2443        while (continue_replay
2444               && cur_dblock <
2445               (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2446                SB_ONDISK_JOURNAL_SIZE(sb))) {
2447                /*
2448                 * Note that it is required for blocksize of primary fs
2449                 * device and journal device to be the same
2450                 */
2451                d_bh =
2452                    reiserfs_breada(journal->j_dev_bd, cur_dblock,
2453                                    sb->s_blocksize,
2454                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2455                                    SB_ONDISK_JOURNAL_SIZE(sb));
2456                ret =
2457                    journal_transaction_is_valid(sb, d_bh,
2458                                                 &oldest_invalid_trans_id,
2459                                                 &newest_mount_id);
2460                if (ret == 1) {
2461                        desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2462                        if (oldest_start == 0) {        /* init all oldest_ values */
2463                                oldest_trans_id = get_desc_trans_id(desc);
2464                                oldest_start = d_bh->b_blocknr;
2465                                newest_mount_id = get_desc_mount_id(desc);
2466                                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2467                                               "journal-1179: Setting "
2468                                               "oldest_start to offset %llu, trans_id %lu",
2469                                               oldest_start -
2470                                               SB_ONDISK_JOURNAL_1st_BLOCK
2471                                               (sb), oldest_trans_id);
2472                        } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2473                                /* one we just read was older */
2474                                oldest_trans_id = get_desc_trans_id(desc);
2475                                oldest_start = d_bh->b_blocknr;
2476                                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2477                                               "journal-1180: Resetting "
2478                                               "oldest_start to offset %lu, trans_id %lu",
2479                                               oldest_start -
2480                                               SB_ONDISK_JOURNAL_1st_BLOCK
2481                                               (sb), oldest_trans_id);
2482                        }
2483                        if (newest_mount_id < get_desc_mount_id(desc)) {
2484                                newest_mount_id = get_desc_mount_id(desc);
2485                                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2486                                               "journal-1299: Setting "
2487                                               "newest_mount_id to %d",
2488                                               get_desc_mount_id(desc));
2489                        }
2490                        cur_dblock += get_desc_trans_len(desc) + 2;
2491                } else {
2492                        cur_dblock++;
2493                }
2494                brelse(d_bh);
2495        }
2496
2497start_log_replay:
2498        cur_dblock = oldest_start;
2499        if (oldest_trans_id) {
2500                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2501                               "journal-1206: Starting replay "
2502                               "from offset %llu, trans_id %lu",
2503                               cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2504                               oldest_trans_id);
2505
2506        }
2507        replay_count = 0;
2508        while (continue_replay && oldest_trans_id > 0) {
2509                ret =
2510                    journal_read_transaction(sb, cur_dblock, oldest_start,
2511                                             oldest_trans_id, newest_mount_id);
2512                if (ret < 0) {
2513                        return ret;
2514                } else if (ret != 0) {
2515                        break;
2516                }
2517                cur_dblock =
2518                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2519                replay_count++;
2520                if (cur_dblock == oldest_start)
2521                        break;
2522        }
2523
2524        if (oldest_trans_id == 0) {
2525                reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2526                               "journal-1225: No valid " "transactions found");
2527        }
2528        /*
2529         * j_start does not get set correctly if we don't replay any
2530         * transactions.  if we had a valid journal_header, set j_start
2531         * to the first unflushed transaction value, copy the trans_id
2532         * from the header
2533         */
2534        if (valid_journal_header && replay_count == 0) {
2535                journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2536                journal->j_trans_id =
2537                    le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2538                /* check for trans_id overflow */
2539                if (journal->j_trans_id == 0)
2540                        journal->j_trans_id = 10;
2541                journal->j_last_flush_trans_id =
2542                    le32_to_cpu(jh->j_last_flush_trans_id);
2543                journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2544        } else {
2545                journal->j_mount_id = newest_mount_id + 1;
2546        }
2547        reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2548                       "newest_mount_id to %lu", journal->j_mount_id);
2549        journal->j_first_unflushed_offset = journal->j_start;
2550        if (replay_count > 0) {
2551                reiserfs_info(sb,
2552                              "replayed %d transactions in %lu seconds\n",
2553                              replay_count, get_seconds() - start);
2554        }
2555        /* needed to satisfy the locking in _update_journal_header_block */
2556        reiserfs_write_lock(sb);
2557        if (!bdev_read_only(sb->s_bdev) &&
2558            _update_journal_header_block(sb, journal->j_start,
2559                                         journal->j_last_flush_trans_id)) {
2560                reiserfs_write_unlock(sb);
2561                /*
2562                 * replay failed, caller must call free_journal_ram and abort
2563                 * the mount
2564                 */
2565                return -1;
2566        }
2567        reiserfs_write_unlock(sb);
2568        return 0;
2569}
2570
2571static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2572{
2573        struct reiserfs_journal_list *jl;
2574        jl = kzalloc(sizeof(struct reiserfs_journal_list),
2575                     GFP_NOFS | __GFP_NOFAIL);
2576        INIT_LIST_HEAD(&jl->j_list);
2577        INIT_LIST_HEAD(&jl->j_working_list);
2578        INIT_LIST_HEAD(&jl->j_tail_bh_list);
2579        INIT_LIST_HEAD(&jl->j_bh_list);
2580        mutex_init(&jl->j_commit_mutex);
2581        SB_JOURNAL(s)->j_num_lists++;
2582        get_journal_list(jl);
2583        return jl;
2584}
2585
2586static void journal_list_init(struct super_block *sb)
2587{
2588        SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2589}
2590
2591static void release_journal_dev(struct super_block *super,
2592                               struct reiserfs_journal *journal)
2593{
2594        if (journal->j_dev_bd != NULL) {
2595                blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2596                journal->j_dev_bd = NULL;
2597        }
2598}
2599
2600static int journal_init_dev(struct super_block *super,
2601                            struct reiserfs_journal *journal,
2602                            const char *jdev_name)
2603{
2604        int result;
2605        dev_t jdev;
2606        fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2607        char b[BDEVNAME_SIZE];
2608
2609        result = 0;
2610
2611        journal->j_dev_bd = NULL;
2612        jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2613            new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2614
2615        if (bdev_read_only(super->s_bdev))
2616                blkdev_mode = FMODE_READ;
2617
2618        /* there is no "jdev" option and journal is on separate device */
2619        if ((!jdev_name || !jdev_name[0])) {
2620                if (jdev == super->s_dev)
2621                        blkdev_mode &= ~FMODE_EXCL;
2622                journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2623                                                      journal);
2624                journal->j_dev_mode = blkdev_mode;
2625                if (IS_ERR(journal->j_dev_bd)) {
2626                        result = PTR_ERR(journal->j_dev_bd);
2627                        journal->j_dev_bd = NULL;
2628                        reiserfs_warning(super, "sh-458",
2629                                         "cannot init journal device '%s': %i",
2630                                         __bdevname(jdev, b), result);
2631                        return result;
2632                } else if (jdev != super->s_dev)
2633                        set_blocksize(journal->j_dev_bd, super->s_blocksize);
2634
2635                return 0;
2636        }
2637
2638        journal->j_dev_mode = blkdev_mode;
2639        journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2640        if (IS_ERR(journal->j_dev_bd)) {
2641                result = PTR_ERR(journal->j_dev_bd);
2642                journal->j_dev_bd = NULL;
2643                reiserfs_warning(super,
2644                                 "journal_init_dev: Cannot open '%s': %i",
2645                                 jdev_name, result);
2646                return result;
2647        }
2648
2649        set_blocksize(journal->j_dev_bd, super->s_blocksize);
2650        reiserfs_info(super,
2651                      "journal_init_dev: journal device: %pg\n",
2652                      journal->j_dev_bd);
2653        return 0;
2654}
2655
2656/*
2657 * When creating/tuning a file system user can assign some
2658 * journal params within boundaries which depend on the ratio
2659 * blocksize/standard_blocksize.
2660 *
2661 * For blocks >= standard_blocksize transaction size should
2662 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2663 * then JOURNAL_TRANS_MAX_DEFAULT.
2664 *
2665 * For blocks < standard_blocksize these boundaries should be
2666 * decreased proportionally.
2667 */
2668#define REISERFS_STANDARD_BLKSIZE (4096)
2669
2670static int check_advise_trans_params(struct super_block *sb,
2671                                     struct reiserfs_journal *journal)
2672{
2673        if (journal->j_trans_max) {
2674                /* Non-default journal params.  Do sanity check for them. */
2675                int ratio = 1;
2676                if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2677                        ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2678
2679                if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2680                    journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2681                    SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2682                    JOURNAL_MIN_RATIO) {
2683                        reiserfs_warning(sb, "sh-462",
2684                                         "bad transaction max size (%u). "
2685                                         "FSCK?", journal->j_trans_max);
2686                        return 1;
2687                }
2688                if (journal->j_max_batch != (journal->j_trans_max) *
2689                        JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2690                        reiserfs_warning(sb, "sh-463",
2691                                         "bad transaction max batch (%u). "
2692                                         "FSCK?", journal->j_max_batch);
2693                        return 1;
2694                }
2695        } else {
2696                /*
2697                 * Default journal params.
2698                 * The file system was created by old version
2699                 * of mkreiserfs, so some fields contain zeros,
2700                 * and we need to advise proper values for them
2701                 */
2702                if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2703                        reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2704                                         sb->s_blocksize);
2705                        return 1;
2706                }
2707                journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2708                journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2709                journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2710        }
2711        return 0;
2712}
2713
2714/* must be called once on fs mount.  calls journal_read for you */
2715int journal_init(struct super_block *sb, const char *j_dev_name,
2716                 int old_format, unsigned int commit_max_age)
2717{
2718        int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2719        struct buffer_head *bhjh;
2720        struct reiserfs_super_block *rs;
2721        struct reiserfs_journal_header *jh;
2722        struct reiserfs_journal *journal;
2723        struct reiserfs_journal_list *jl;
2724        int ret;
2725
2726        journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2727        if (!journal) {
2728                reiserfs_warning(sb, "journal-1256",
2729                                 "unable to get memory for journal structure");
2730                return 1;
2731        }
2732        INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2733        INIT_LIST_HEAD(&journal->j_prealloc_list);
2734        INIT_LIST_HEAD(&journal->j_working_list);
2735        INIT_LIST_HEAD(&journal->j_journal_list);
2736        journal->j_persistent_trans = 0;
2737        if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2738                                           reiserfs_bmap_count(sb)))
2739                goto free_and_return;
2740
2741        allocate_bitmap_nodes(sb);
2742
2743        /* reserved for journal area support */
2744        SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2745                                                 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2746                                                 / sb->s_blocksize +
2747                                                 reiserfs_bmap_count(sb) +
2748                                                 1 :
2749                                                 REISERFS_DISK_OFFSET_IN_BYTES /
2750                                                 sb->s_blocksize + 2);
2751
2752        /*
2753         * Sanity check to see is the standard journal fitting
2754         * within first bitmap (actual for small blocksizes)
2755         */
2756        if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2757            (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2758             SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2759                reiserfs_warning(sb, "journal-1393",
2760                                 "journal does not fit for area addressed "
2761                                 "by first of bitmap blocks. It starts at "
2762                                 "%u and its size is %u. Block size %ld",
2763                                 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2764                                 SB_ONDISK_JOURNAL_SIZE(sb),
2765                                 sb->s_blocksize);
2766                goto free_and_return;
2767        }
2768
2769        if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2770                reiserfs_warning(sb, "sh-462",
2771                                 "unable to initialize journal device");
2772                goto free_and_return;
2773        }
2774
2775        rs = SB_DISK_SUPER_BLOCK(sb);
2776
2777        /* read journal header */
2778        bhjh = journal_bread(sb,
2779                             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2780                             SB_ONDISK_JOURNAL_SIZE(sb));
2781        if (!bhjh) {
2782                reiserfs_warning(sb, "sh-459",
2783                                 "unable to read journal header");
2784                goto free_and_return;
2785        }
2786        jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2787
2788        /* make sure that journal matches to the super block */
2789        if (is_reiserfs_jr(rs)
2790            && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2791                sb_jp_journal_magic(rs))) {
2792                reiserfs_warning(sb, "sh-460",
2793                                 "journal header magic %x (device %pg) does "
2794                                 "not match to magic found in super block %x",
2795                                 jh->jh_journal.jp_journal_magic,
2796                                 journal->j_dev_bd,
2797                                 sb_jp_journal_magic(rs));
2798                brelse(bhjh);
2799                goto free_and_return;
2800        }
2801
2802        journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2803        journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2804        journal->j_max_commit_age =
2805            le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2806        journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2807
2808        if (check_advise_trans_params(sb, journal) != 0)
2809                goto free_and_return;
2810        journal->j_default_max_commit_age = journal->j_max_commit_age;
2811
2812        if (commit_max_age != 0) {
2813                journal->j_max_commit_age = commit_max_age;
2814                journal->j_max_trans_age = commit_max_age;
2815        }
2816
2817        reiserfs_info(sb, "journal params: device %pg, size %u, "
2818                      "journal first block %u, max trans len %u, max batch %u, "
2819                      "max commit age %u, max trans age %u\n",
2820                      journal->j_dev_bd,
2821                      SB_ONDISK_JOURNAL_SIZE(sb),
2822                      SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2823                      journal->j_trans_max,
2824                      journal->j_max_batch,
2825                      journal->j_max_commit_age, journal->j_max_trans_age);
2826
2827        brelse(bhjh);
2828
2829        journal->j_list_bitmap_index = 0;
2830        journal_list_init(sb);
2831
2832        memset(journal->j_list_hash_table, 0,
2833               JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2834
2835        INIT_LIST_HEAD(&journal->j_dirty_buffers);
2836        spin_lock_init(&journal->j_dirty_buffers_lock);
2837
2838        journal->j_start = 0;
2839        journal->j_len = 0;
2840        journal->j_len_alloc = 0;
2841        atomic_set(&journal->j_wcount, 0);
2842        atomic_set(&journal->j_async_throttle, 0);
2843        journal->j_bcount = 0;
2844        journal->j_trans_start_time = 0;
2845        journal->j_last = NULL;
2846        journal->j_first = NULL;
2847        init_waitqueue_head(&journal->j_join_wait);
2848        mutex_init(&journal->j_mutex);
2849        mutex_init(&journal->j_flush_mutex);
2850
2851        journal->j_trans_id = 10;
2852        journal->j_mount_id = 10;
2853        journal->j_state = 0;
2854        atomic_set(&journal->j_jlock, 0);
2855        journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2856        journal->j_cnode_free_orig = journal->j_cnode_free_list;
2857        journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2858        journal->j_cnode_used = 0;
2859        journal->j_must_wait = 0;
2860
2861        if (journal->j_cnode_free == 0) {
2862                reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2863                                 "allocation failed (%ld bytes). Journal is "
2864                                 "too large for available memory. Usually "
2865                                 "this is due to a journal that is too large.",
2866                                 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2867                goto free_and_return;
2868        }
2869
2870        init_journal_hash(sb);
2871        jl = journal->j_current_jl;
2872
2873        /*
2874         * get_list_bitmap() may call flush_commit_list() which
2875         * requires the lock. Calling flush_commit_list() shouldn't happen
2876         * this early but I like to be paranoid.
2877         */
2878        reiserfs_write_lock(sb);
2879        jl->j_list_bitmap = get_list_bitmap(sb, jl);
2880        reiserfs_write_unlock(sb);
2881        if (!jl->j_list_bitmap) {
2882                reiserfs_warning(sb, "journal-2005",
2883                                 "get_list_bitmap failed for journal list 0");
2884                goto free_and_return;
2885        }
2886
2887        ret = journal_read(sb);
2888        if (ret < 0) {
2889                reiserfs_warning(sb, "reiserfs-2006",
2890                                 "Replay Failure, unable to mount");
2891                goto free_and_return;
2892        }
2893
2894        INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2895        journal->j_work_sb = sb;
2896        return 0;
2897free_and_return:
2898        free_journal_ram(sb);
2899        return 1;
2900}
2901
2902/*
2903 * test for a polite end of the current transaction.  Used by file_write,
2904 * and should be used by delete to make sure they don't write more than
2905 * can fit inside a single transaction
2906 */
2907int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2908                                   int new_alloc)
2909{
2910        struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2911        time_t now = get_seconds();
2912        /* cannot restart while nested */
2913        BUG_ON(!th->t_trans_id);
2914        if (th->t_refcount > 1)
2915                return 0;
2916        if (journal->j_must_wait > 0 ||
2917            (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2918            atomic_read(&journal->j_jlock) ||
2919            (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2920            journal->j_cnode_free < (journal->j_trans_max * 3)) {
2921                return 1;
2922        }
2923
2924        journal->j_len_alloc += new_alloc;
2925        th->t_blocks_allocated += new_alloc ;
2926        return 0;
2927}
2928
2929/* this must be called inside a transaction */
2930void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2931{
2932        struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2933        BUG_ON(!th->t_trans_id);
2934        journal->j_must_wait = 1;
2935        set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2936        return;
2937}
2938
2939/* this must be called without a transaction started */
2940void reiserfs_allow_writes(struct super_block *s)
2941{
2942        struct reiserfs_journal *journal = SB_JOURNAL(s);
2943        clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2944        wake_up(&journal->j_join_wait);
2945}
2946
2947/* this must be called without a transaction started */
2948void reiserfs_wait_on_write_block(struct super_block *s)
2949{
2950        struct reiserfs_journal *journal = SB_JOURNAL(s);
2951        wait_event(journal->j_join_wait,
2952                   !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2953}
2954
2955static void queue_log_writer(struct super_block *s)
2956{
2957        wait_queue_t wait;
2958        struct reiserfs_journal *journal = SB_JOURNAL(s);
2959        set_bit(J_WRITERS_QUEUED, &journal->j_state);
2960
2961        /*
2962         * we don't want to use wait_event here because
2963         * we only want to wait once.
2964         */
2965        init_waitqueue_entry(&wait, current);
2966        add_wait_queue(&journal->j_join_wait, &wait);
2967        set_current_state(TASK_UNINTERRUPTIBLE);
2968        if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2969                int depth = reiserfs_write_unlock_nested(s);
2970                schedule();
2971                reiserfs_write_lock_nested(s, depth);
2972        }
2973        __set_current_state(TASK_RUNNING);
2974        remove_wait_queue(&journal->j_join_wait, &wait);
2975}
2976
2977static void wake_queued_writers(struct super_block *s)
2978{
2979        struct reiserfs_journal *journal = SB_JOURNAL(s);
2980        if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2981                wake_up(&journal->j_join_wait);
2982}
2983
2984static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2985{
2986        struct reiserfs_journal *journal = SB_JOURNAL(sb);
2987        unsigned long bcount = journal->j_bcount;
2988        while (1) {
2989                int depth;
2990
2991                depth = reiserfs_write_unlock_nested(sb);
2992                schedule_timeout_uninterruptible(1);
2993                reiserfs_write_lock_nested(sb, depth);
2994
2995                journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2996                while ((atomic_read(&journal->j_wcount) > 0 ||
2997                        atomic_read(&journal->j_jlock)) &&
2998                       journal->j_trans_id == trans_id) {
2999                        queue_log_writer(sb);
3000                }
3001                if (journal->j_trans_id != trans_id)
3002                        break;
3003                if (bcount == journal->j_bcount)
3004                        break;
3005                bcount = journal->j_bcount;
3006        }
3007}
3008
3009/*
3010 * join == true if you must join an existing transaction.
3011 * join == false if you can deal with waiting for others to finish
3012 *
3013 * this will block until the transaction is joinable.  send the number of
3014 * blocks you expect to use in nblocks.
3015*/
3016static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3017                              struct super_block *sb, unsigned long nblocks,
3018                              int join)
3019{
3020        time_t now = get_seconds();
3021        unsigned int old_trans_id;
3022        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3023        struct reiserfs_transaction_handle myth;
3024        int sched_count = 0;
3025        int retval;
3026        int depth;
3027
3028        reiserfs_check_lock_depth(sb, "journal_begin");
3029        BUG_ON(nblocks > journal->j_trans_max);
3030
3031        PROC_INFO_INC(sb, journal.journal_being);
3032        /* set here for journal_join */
3033        th->t_refcount = 1;
3034        th->t_super = sb;
3035
3036relock:
3037        lock_journal(sb);
3038        if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3039                unlock_journal(sb);
3040                retval = journal->j_errno;
3041                goto out_fail;
3042        }
3043        journal->j_bcount++;
3044
3045        if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3046                unlock_journal(sb);
3047                depth = reiserfs_write_unlock_nested(sb);
3048                reiserfs_wait_on_write_block(sb);
3049                reiserfs_write_lock_nested(sb, depth);
3050                PROC_INFO_INC(sb, journal.journal_relock_writers);
3051                goto relock;
3052        }
3053        now = get_seconds();
3054
3055        /*
3056         * if there is no room in the journal OR
3057         * if this transaction is too old, and we weren't called joinable,
3058         * wait for it to finish before beginning we don't sleep if there
3059         * aren't other writers
3060         */
3061
3062        if ((!join && journal->j_must_wait > 0) ||
3063            (!join
3064             && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3065            || (!join && atomic_read(&journal->j_wcount) > 0
3066                && journal->j_trans_start_time > 0
3067                && (now - journal->j_trans_start_time) >
3068                journal->j_max_trans_age) || (!join
3069                                              && atomic_read(&journal->j_jlock))
3070            || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3071
3072                old_trans_id = journal->j_trans_id;
3073                /* allow others to finish this transaction */
3074                unlock_journal(sb);
3075
3076                if (!join && (journal->j_len_alloc + nblocks + 2) >=
3077                    journal->j_max_batch &&
3078                    ((journal->j_len + nblocks + 2) * 100) <
3079                    (journal->j_len_alloc * 75)) {
3080                        if (atomic_read(&journal->j_wcount) > 10) {
3081                                sched_count++;
3082                                queue_log_writer(sb);
3083                                goto relock;
3084                        }
3085                }
3086                /*
3087                 * don't mess with joining the transaction if all we
3088                 * have to do is wait for someone else to do a commit
3089                 */
3090                if (atomic_read(&journal->j_jlock)) {
3091                        while (journal->j_trans_id == old_trans_id &&
3092                               atomic_read(&journal->j_jlock)) {
3093                                queue_log_writer(sb);
3094                        }
3095                        goto relock;
3096                }
3097                retval = journal_join(&myth, sb);
3098                if (retval)
3099                        goto out_fail;
3100
3101                /* someone might have ended the transaction while we joined */
3102                if (old_trans_id != journal->j_trans_id) {
3103                        retval = do_journal_end(&myth, 0);
3104                } else {
3105                        retval = do_journal_end(&myth, COMMIT_NOW);
3106                }
3107
3108                if (retval)
3109                        goto out_fail;
3110
3111                PROC_INFO_INC(sb, journal.journal_relock_wcount);
3112                goto relock;
3113        }
3114        /* we are the first writer, set trans_id */
3115        if (journal->j_trans_start_time == 0) {
3116                journal->j_trans_start_time = get_seconds();
3117        }
3118        atomic_inc(&journal->j_wcount);
3119        journal->j_len_alloc += nblocks;
3120        th->t_blocks_logged = 0;
3121        th->t_blocks_allocated = nblocks;
3122        th->t_trans_id = journal->j_trans_id;
3123        unlock_journal(sb);
3124        INIT_LIST_HEAD(&th->t_list);
3125        return 0;
3126
3127out_fail:
3128        memset(th, 0, sizeof(*th));
3129        /*
3130         * Re-set th->t_super, so we can properly keep track of how many
3131         * persistent transactions there are. We need to do this so if this
3132         * call is part of a failed restart_transaction, we can free it later
3133         */
3134        th->t_super = sb;
3135        return retval;
3136}
3137
3138struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3139                                                                    super_block
3140                                                                    *s,
3141                                                                    int nblocks)
3142{
3143        int ret;
3144        struct reiserfs_transaction_handle *th;
3145
3146        /*
3147         * if we're nesting into an existing transaction.  It will be
3148         * persistent on its own
3149         */
3150        if (reiserfs_transaction_running(s)) {
3151                th = current->journal_info;
3152                th->t_refcount++;
3153                BUG_ON(th->t_refcount < 2);
3154
3155                return th;
3156        }
3157        th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3158        if (!th)
3159                return NULL;
3160        ret = journal_begin(th, s, nblocks);
3161        if (ret) {
3162                kfree(th);
3163                return NULL;
3164        }
3165
3166        SB_JOURNAL(s)->j_persistent_trans++;
3167        return th;
3168}
3169
3170int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3171{
3172        struct super_block *s = th->t_super;
3173        int ret = 0;
3174        if (th->t_trans_id)
3175                ret = journal_end(th);
3176        else
3177                ret = -EIO;
3178        if (th->t_refcount == 0) {
3179                SB_JOURNAL(s)->j_persistent_trans--;
3180                kfree(th);
3181        }
3182        return ret;
3183}
3184
3185static int journal_join(struct reiserfs_transaction_handle *th,
3186                        struct super_block *sb)
3187{
3188        struct reiserfs_transaction_handle *cur_th = current->journal_info;
3189
3190        /*
3191         * this keeps do_journal_end from NULLing out the
3192         * current->journal_info pointer
3193         */
3194        th->t_handle_save = cur_th;
3195        BUG_ON(cur_th && cur_th->t_refcount > 1);
3196        return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3197}
3198
3199int journal_join_abort(struct reiserfs_transaction_handle *th,
3200                       struct super_block *sb)
3201{
3202        struct reiserfs_transaction_handle *cur_th = current->journal_info;
3203
3204        /*
3205         * this keeps do_journal_end from NULLing out the
3206         * current->journal_info pointer
3207         */
3208        th->t_handle_save = cur_th;
3209        BUG_ON(cur_th && cur_th->t_refcount > 1);
3210        return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3211}
3212
3213int journal_begin(struct reiserfs_transaction_handle *th,
3214                  struct super_block *sb, unsigned long nblocks)
3215{
3216        struct reiserfs_transaction_handle *cur_th = current->journal_info;
3217        int ret;
3218
3219        th->t_handle_save = NULL;
3220        if (cur_th) {
3221                /* we are nesting into the current transaction */
3222                if (cur_th->t_super == sb) {
3223                        BUG_ON(!cur_th->t_refcount);
3224                        cur_th->t_refcount++;
3225                        memcpy(th, cur_th, sizeof(*th));
3226                        if (th->t_refcount <= 1)
3227                                reiserfs_warning(sb, "reiserfs-2005",
3228                                                 "BAD: refcount <= 1, but "
3229                                                 "journal_info != 0");
3230                        return 0;
3231                } else {
3232                        /*
3233                         * we've ended up with a handle from a different
3234                         * filesystem.  save it and restore on journal_end.
3235                         * This should never really happen...
3236                         */
3237                        reiserfs_warning(sb, "clm-2100",
3238                                         "nesting info a different FS");
3239                        th->t_handle_save = current->journal_info;
3240                        current->journal_info = th;
3241                }
3242        } else {
3243                current->journal_info = th;
3244        }
3245        ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3246        BUG_ON(current->journal_info != th);
3247
3248        /*
3249         * I guess this boils down to being the reciprocal of clm-2100 above.
3250         * If do_journal_begin_r fails, we need to put it back, since
3251         * journal_end won't be called to do it. */
3252        if (ret)
3253                current->journal_info = th->t_handle_save;
3254        else
3255                BUG_ON(!th->t_refcount);
3256
3257        return ret;
3258}
3259
3260/*
3261 * puts bh into the current transaction.  If it was already there, reorders
3262 * removes the old pointers from the hash, and puts new ones in (to make
3263 * sure replay happen in the right order).
3264 *
3265 * if it was dirty, cleans and files onto the clean list.  I can't let it
3266 * be dirty again until the transaction is committed.
3267 *
3268 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3269 */
3270int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3271                       struct buffer_head *bh)
3272{
3273        struct super_block *sb = th->t_super;
3274        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3275        struct reiserfs_journal_cnode *cn = NULL;
3276        int count_already_incd = 0;
3277        int prepared = 0;
3278        BUG_ON(!th->t_trans_id);
3279
3280        PROC_INFO_INC(sb, journal.mark_dirty);
3281        if (th->t_trans_id != journal->j_trans_id) {
3282                reiserfs_panic(th->t_super, "journal-1577",
3283                               "handle trans id %ld != current trans id %ld",
3284                               th->t_trans_id, journal->j_trans_id);
3285        }
3286
3287        prepared = test_clear_buffer_journal_prepared(bh);
3288        clear_buffer_journal_restore_dirty(bh);
3289        /* already in this transaction, we are done */
3290        if (buffer_journaled(bh)) {
3291                PROC_INFO_INC(sb, journal.mark_dirty_already);
3292                return 0;
3293        }
3294
3295        /*
3296         * this must be turned into a panic instead of a warning.  We can't
3297         * allow a dirty or journal_dirty or locked buffer to be logged, as
3298         * some changes could get to disk too early.  NOT GOOD.
3299         */
3300        if (!prepared || buffer_dirty(bh)) {
3301                reiserfs_warning(sb, "journal-1777",
3302                                 "buffer %llu bad state "
3303                                 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3304                                 (unsigned long long)bh->b_blocknr,
3305                                 prepared ? ' ' : '!',
3306                                 buffer_locked(bh) ? ' ' : '!',
3307                                 buffer_dirty(bh) ? ' ' : '!',
3308                                 buffer_journal_dirty(bh) ? ' ' : '!');
3309        }
3310
3311        if (atomic_read(&journal->j_wcount) <= 0) {
3312                reiserfs_warning(sb, "journal-1409",
3313                                 "returning because j_wcount was %d",
3314                                 atomic_read(&journal->j_wcount));
3315                return 1;
3316        }
3317        /*
3318         * this error means I've screwed up, and we've overflowed
3319         * the transaction.  Nothing can be done here, except make the
3320         * FS readonly or panic.
3321         */
3322        if (journal->j_len >= journal->j_trans_max) {
3323                reiserfs_panic(th->t_super, "journal-1413",
3324                               "j_len (%lu) is too big",
3325                               journal->j_len);
3326        }
3327
3328        if (buffer_journal_dirty(bh)) {
3329                count_already_incd = 1;
3330                PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3331                clear_buffer_journal_dirty(bh);
3332        }
3333
3334        if (journal->j_len > journal->j_len_alloc) {
3335                journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3336        }
3337
3338        set_buffer_journaled(bh);
3339
3340        /* now put this guy on the end */
3341        if (!cn) {
3342                cn = get_cnode(sb);
3343                if (!cn) {
3344                        reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3345                }
3346
3347                if (th->t_blocks_logged == th->t_blocks_allocated) {
3348                        th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3349                        journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3350                }
3351                th->t_blocks_logged++;
3352                journal->j_len++;
3353
3354                cn->bh = bh;
3355                cn->blocknr = bh->b_blocknr;
3356                cn->sb = sb;
3357                cn->jlist = NULL;
3358                insert_journal_hash(journal->j_hash_table, cn);
3359                if (!count_already_incd) {
3360                        get_bh(bh);
3361                }
3362        }
3363        cn->next = NULL;
3364        cn->prev = journal->j_last;
3365        cn->bh = bh;
3366        if (journal->j_last) {
3367                journal->j_last->next = cn;
3368                journal->j_last = cn;
3369        } else {
3370                journal->j_first = cn;
3371                journal->j_last = cn;
3372        }
3373        reiserfs_schedule_old_flush(sb);
3374        return 0;
3375}
3376
3377int journal_end(struct reiserfs_transaction_handle *th)
3378{
3379        struct super_block *sb = th->t_super;
3380        if (!current->journal_info && th->t_refcount > 1)
3381                reiserfs_warning(sb, "REISER-NESTING",
3382                                 "th NULL, refcount %d", th->t_refcount);
3383
3384        if (!th->t_trans_id) {
3385                WARN_ON(1);
3386                return -EIO;
3387        }
3388
3389        th->t_refcount--;
3390        if (th->t_refcount > 0) {
3391                struct reiserfs_transaction_handle *cur_th =
3392                    current->journal_info;
3393
3394                /*
3395                 * we aren't allowed to close a nested transaction on a
3396                 * different filesystem from the one in the task struct
3397                 */
3398                BUG_ON(cur_th->t_super != th->t_super);
3399
3400                if (th != cur_th) {
3401                        memcpy(current->journal_info, th, sizeof(*th));
3402                        th->t_trans_id = 0;
3403                }
3404                return 0;
3405        } else {
3406                return do_journal_end(th, 0);
3407        }
3408}
3409
3410/*
3411 * removes from the current transaction, relsing and descrementing any counters.
3412 * also files the removed buffer directly onto the clean list
3413 *
3414 * called by journal_mark_freed when a block has been deleted
3415 *
3416 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3417 */
3418static int remove_from_transaction(struct super_block *sb,
3419                                   b_blocknr_t blocknr, int already_cleaned)
3420{
3421        struct buffer_head *bh;
3422        struct reiserfs_journal_cnode *cn;
3423        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3424        int ret = 0;
3425
3426        cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3427        if (!cn || !cn->bh) {
3428                return ret;
3429        }
3430        bh = cn->bh;
3431        if (cn->prev) {
3432                cn->prev->next = cn->next;
3433        }
3434        if (cn->next) {
3435                cn->next->prev = cn->prev;
3436        }
3437        if (cn == journal->j_first) {
3438                journal->j_first = cn->next;
3439        }
3440        if (cn == journal->j_last) {
3441                journal->j_last = cn->prev;
3442        }
3443        if (bh)
3444                remove_journal_hash(sb, journal->j_hash_table, NULL,
3445                                    bh->b_blocknr, 0);
3446        clear_buffer_journaled(bh);     /* don't log this one */
3447
3448        if (!already_cleaned) {
3449                clear_buffer_journal_dirty(bh);
3450                clear_buffer_dirty(bh);
3451                clear_buffer_journal_test(bh);
3452                put_bh(bh);
3453                if (atomic_read(&bh->b_count) < 0) {
3454                        reiserfs_warning(sb, "journal-1752",
3455                                         "b_count < 0");
3456                }
3457                ret = 1;
3458        }
3459        journal->j_len--;
3460        journal->j_len_alloc--;
3461        free_cnode(sb, cn);
3462        return ret;
3463}
3464
3465/*
3466 * for any cnode in a journal list, it can only be dirtied of all the
3467 * transactions that include it are committed to disk.
3468 * this checks through each transaction, and returns 1 if you are allowed
3469 * to dirty, and 0 if you aren't
3470 *
3471 * it is called by dirty_journal_list, which is called after
3472 * flush_commit_list has gotten all the log blocks for a given
3473 * transaction on disk
3474 *
3475 */
3476static int can_dirty(struct reiserfs_journal_cnode *cn)
3477{
3478        struct super_block *sb = cn->sb;
3479        b_blocknr_t blocknr = cn->blocknr;
3480        struct reiserfs_journal_cnode *cur = cn->hprev;
3481        int can_dirty = 1;
3482
3483        /*
3484         * first test hprev.  These are all newer than cn, so any node here
3485         * with the same block number and dev means this node can't be sent
3486         * to disk right now.
3487         */
3488        while (cur && can_dirty) {
3489                if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3490                    cur->blocknr == blocknr) {
3491                        can_dirty = 0;
3492                }
3493                cur = cur->hprev;
3494        }
3495        /*
3496         * then test hnext.  These are all older than cn.  As long as they
3497         * are committed to the log, it is safe to write cn to disk
3498         */
3499        cur = cn->hnext;
3500        while (cur && can_dirty) {
3501                if (cur->jlist && cur->jlist->j_len > 0 &&
3502                    atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3503                    cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3504                        can_dirty = 0;
3505                }
3506                cur = cur->hnext;
3507        }
3508        return can_dirty;
3509}
3510
3511/*
3512 * syncs the commit blocks, but does not force the real buffers to disk
3513 * will wait until the current transaction is done/committed before returning
3514 */
3515int journal_end_sync(struct reiserfs_transaction_handle *th)
3516{
3517        struct super_block *sb = th->t_super;
3518        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3519
3520        BUG_ON(!th->t_trans_id);
3521        /* you can sync while nested, very, very bad */
3522        BUG_ON(th->t_refcount > 1);
3523        if (journal->j_len == 0) {
3524                reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3525                                             1);
3526                journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3527        }
3528        return do_journal_end(th, COMMIT_NOW | WAIT);
3529}
3530
3531/* writeback the pending async commits to disk */
3532static void flush_async_commits(struct work_struct *work)
3533{
3534        struct reiserfs_journal *journal =
3535                container_of(work, struct reiserfs_journal, j_work.work);
3536        struct super_block *sb = journal->j_work_sb;
3537        struct reiserfs_journal_list *jl;
3538        struct list_head *entry;
3539
3540        reiserfs_write_lock(sb);
3541        if (!list_empty(&journal->j_journal_list)) {
3542                /* last entry is the youngest, commit it and you get everything */
3543                entry = journal->j_journal_list.prev;
3544                jl = JOURNAL_LIST_ENTRY(entry);
3545                flush_commit_list(sb, jl, 1);
3546        }
3547        reiserfs_write_unlock(sb);
3548}
3549
3550/*
3551 * flushes any old transactions to disk
3552 * ends the current transaction if it is too old
3553 */
3554void reiserfs_flush_old_commits(struct super_block *sb)
3555{
3556        time_t now;
3557        struct reiserfs_transaction_handle th;
3558        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3559
3560        now = get_seconds();
3561        /*
3562         * safety check so we don't flush while we are replaying the log during
3563         * mount
3564         */
3565        if (list_empty(&journal->j_journal_list))
3566                return;
3567
3568        /*
3569         * check the current transaction.  If there are no writers, and it is
3570         * too old, finish it, and force the commit blocks to disk
3571         */
3572        if (atomic_read(&journal->j_wcount) <= 0 &&
3573            journal->j_trans_start_time > 0 &&
3574            journal->j_len > 0 &&
3575            (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3576                if (!journal_join(&th, sb)) {
3577                        reiserfs_prepare_for_journal(sb,
3578                                                     SB_BUFFER_WITH_SB(sb),
3579                                                     1);
3580                        journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3581
3582                        /*
3583                         * we're only being called from kreiserfsd, it makes
3584                         * no sense to do an async commit so that kreiserfsd
3585                         * can do it later
3586                         */
3587                        do_journal_end(&th, COMMIT_NOW | WAIT);
3588                }
3589        }
3590}
3591
3592/*
3593 * returns 0 if do_journal_end should return right away, returns 1 if
3594 * do_journal_end should finish the commit
3595 *
3596 * if the current transaction is too old, but still has writers, this will
3597 * wait on j_join_wait until all the writers are done.  By the time it
3598 * wakes up, the transaction it was called has already ended, so it just
3599 * flushes the commit list and returns 0.
3600 *
3601 * Won't batch when flush or commit_now is set.  Also won't batch when
3602 * others are waiting on j_join_wait.
3603 *
3604 * Note, we can't allow the journal_end to proceed while there are still
3605 * writers in the log.
3606 */
3607static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3608{
3609
3610        time_t now;
3611        int flush = flags & FLUSH_ALL;
3612        int commit_now = flags & COMMIT_NOW;
3613        int wait_on_commit = flags & WAIT;
3614        struct reiserfs_journal_list *jl;
3615        struct super_block *sb = th->t_super;
3616        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3617
3618        BUG_ON(!th->t_trans_id);
3619
3620        if (th->t_trans_id != journal->j_trans_id) {
3621                reiserfs_panic(th->t_super, "journal-1577",
3622                               "handle trans id %ld != current trans id %ld",
3623                               th->t_trans_id, journal->j_trans_id);
3624        }
3625
3626        journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3627        /* <= 0 is allowed.  unmounting might not call begin */
3628        if (atomic_read(&journal->j_wcount) > 0)
3629                atomic_dec(&journal->j_wcount);
3630
3631        /*
3632         * BUG, deal with case where j_len is 0, but people previously
3633         * freed blocks need to be released will be dealt with by next
3634         * transaction that actually writes something, but should be taken
3635         * care of in this trans
3636         */
3637        BUG_ON(journal->j_len == 0);
3638
3639        /*
3640         * if wcount > 0, and we are called to with flush or commit_now,
3641         * we wait on j_join_wait.  We will wake up when the last writer has
3642         * finished the transaction, and started it on its way to the disk.
3643         * Then, we flush the commit or journal list, and just return 0
3644         * because the rest of journal end was already done for this
3645         * transaction.
3646         */
3647        if (atomic_read(&journal->j_wcount) > 0) {
3648                if (flush || commit_now) {
3649                        unsigned trans_id;
3650
3651                        jl = journal->j_current_jl;
3652                        trans_id = jl->j_trans_id;
3653                        if (wait_on_commit)
3654                                jl->j_state |= LIST_COMMIT_PENDING;
3655                        atomic_set(&journal->j_jlock, 1);
3656                        if (flush) {
3657                                journal->j_next_full_flush = 1;
3658                        }
3659                        unlock_journal(sb);
3660
3661                        /*
3662                         * sleep while the current transaction is
3663                         * still j_jlocked
3664                         */
3665                        while (journal->j_trans_id == trans_id) {
3666                                if (atomic_read(&journal->j_jlock)) {
3667                                        queue_log_writer(sb);
3668                                } else {
3669                                        lock_journal(sb);
3670                                        if (journal->j_trans_id == trans_id) {
3671                                                atomic_set(&journal->j_jlock,
3672                                                           1);
3673                                        }
3674                                        unlock_journal(sb);
3675                                }
3676                        }
3677                        BUG_ON(journal->j_trans_id == trans_id);
3678
3679                        if (commit_now
3680                            && journal_list_still_alive(sb, trans_id)
3681                            && wait_on_commit) {
3682                                flush_commit_list(sb, jl, 1);
3683                        }
3684                        return 0;
3685                }
3686                unlock_journal(sb);
3687                return 0;
3688        }
3689
3690        /* deal with old transactions where we are the last writers */
3691        now = get_seconds();
3692        if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3693                commit_now = 1;
3694                journal->j_next_async_flush = 1;
3695        }
3696        /* don't batch when someone is waiting on j_join_wait */
3697        /* don't batch when syncing the commit or flushing the whole trans */
3698        if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3699            && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3700            && journal->j_len_alloc < journal->j_max_batch
3701            && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3702                journal->j_bcount++;
3703                unlock_journal(sb);
3704                return 0;
3705        }
3706
3707        if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3708                reiserfs_panic(sb, "journal-003",
3709                               "j_start (%ld) is too high",
3710                               journal->j_start);
3711        }
3712        return 1;
3713}
3714
3715/*
3716 * Does all the work that makes deleting blocks safe.
3717 * when deleting a block mark BH_JNew, just remove it from the current
3718 * transaction, clean it's buffer_head and move on.
3719 *
3720 * otherwise:
3721 * set a bit for the block in the journal bitmap.  That will prevent it from
3722 * being allocated for unformatted nodes before this transaction has finished.
3723 *
3724 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3725 * That will prevent any old transactions with this block from trying to flush
3726 * to the real location.  Since we aren't removing the cnode from the
3727 * journal_list_hash, *the block can't be reallocated yet.
3728 *
3729 * Then remove it from the current transaction, decrementing any counters and
3730 * filing it on the clean list.
3731 */
3732int journal_mark_freed(struct reiserfs_transaction_handle *th,
3733                       struct super_block *sb, b_blocknr_t blocknr)
3734{
3735        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3736        struct reiserfs_journal_cnode *cn = NULL;
3737        struct buffer_head *bh = NULL;
3738        struct reiserfs_list_bitmap *jb = NULL;
3739        int cleaned = 0;
3740        BUG_ON(!th->t_trans_id);
3741
3742        cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3743        if (cn && cn->bh) {
3744                bh = cn->bh;
3745                get_bh(bh);
3746        }
3747        /* if it is journal new, we just remove it from this transaction */
3748        if (bh && buffer_journal_new(bh)) {
3749                clear_buffer_journal_new(bh);
3750                clear_prepared_bits(bh);
3751                reiserfs_clean_and_file_buffer(bh);
3752                cleaned = remove_from_transaction(sb, blocknr, cleaned);
3753        } else {
3754                /*
3755                 * set the bit for this block in the journal bitmap
3756                 * for this transaction
3757                 */
3758                jb = journal->j_current_jl->j_list_bitmap;
3759                if (!jb) {
3760                        reiserfs_panic(sb, "journal-1702",
3761                                       "journal_list_bitmap is NULL");
3762                }
3763                set_bit_in_list_bitmap(sb, blocknr, jb);
3764
3765                /* Note, the entire while loop is not allowed to schedule.  */
3766
3767                if (bh) {
3768                        clear_prepared_bits(bh);
3769                        reiserfs_clean_and_file_buffer(bh);
3770                }
3771                cleaned = remove_from_transaction(sb, blocknr, cleaned);
3772
3773                /*
3774                 * find all older transactions with this block,
3775                 * make sure they don't try to write it out
3776                 */
3777                cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3778                                          blocknr);
3779                while (cn) {
3780                        if (sb == cn->sb && blocknr == cn->blocknr) {
3781                                set_bit(BLOCK_FREED, &cn->state);
3782                                if (cn->bh) {
3783                                        /*
3784                                         * remove_from_transaction will brelse
3785                                         * the buffer if it was in the current
3786                                         * trans
3787                                         */
3788                                        if (!cleaned) {
3789                                                clear_buffer_journal_dirty(cn->
3790                                                                           bh);
3791                                                clear_buffer_dirty(cn->bh);
3792                                                clear_buffer_journal_test(cn->
3793                                                                          bh);
3794                                                cleaned = 1;
3795                                                put_bh(cn->bh);
3796                                                if (atomic_read
3797                                                    (&cn->bh->b_count) < 0) {
3798                                                        reiserfs_warning(sb,
3799                                                                 "journal-2138",
3800                                                                 "cn->bh->b_count < 0");
3801                                                }
3802                                        }
3803                                        /*
3804                                         * since we are clearing the bh,
3805                                         * we MUST dec nonzerolen
3806                                         */
3807                                        if (cn->jlist) {
3808                                                atomic_dec(&cn->jlist->
3809                                                           j_nonzerolen);
3810                                        }
3811                                        cn->bh = NULL;
3812                                }
3813                        }
3814                        cn = cn->hnext;
3815                }
3816        }
3817
3818        if (bh)
3819                release_buffer_page(bh); /* get_hash grabs the buffer */
3820        return 0;
3821}
3822
3823void reiserfs_update_inode_transaction(struct inode *inode)
3824{
3825        struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3826        REISERFS_I(inode)->i_jl = journal->j_current_jl;
3827        REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3828}
3829
3830/*
3831 * returns -1 on error, 0 if no commits/barriers were done and 1
3832 * if a transaction was actually committed and the barrier was done
3833 */
3834static int __commit_trans_jl(struct inode *inode, unsigned long id,
3835                             struct reiserfs_journal_list *jl)
3836{
3837        struct reiserfs_transaction_handle th;
3838        struct super_block *sb = inode->i_sb;
3839        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3840        int ret = 0;
3841
3842        /*
3843         * is it from the current transaction,
3844         * or from an unknown transaction?
3845         */
3846        if (id == journal->j_trans_id) {
3847                jl = journal->j_current_jl;
3848                /*
3849                 * try to let other writers come in and
3850                 * grow this transaction
3851                 */
3852                let_transaction_grow(sb, id);
3853                if (journal->j_trans_id != id) {
3854                        goto flush_commit_only;
3855                }
3856
3857                ret = journal_begin(&th, sb, 1);
3858                if (ret)
3859                        return ret;
3860
3861                /* someone might have ended this transaction while we joined */
3862                if (journal->j_trans_id != id) {
3863                        reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3864                                                     1);
3865                        journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3866                        ret = journal_end(&th);
3867                        goto flush_commit_only;
3868                }
3869
3870                ret = journal_end_sync(&th);
3871                if (!ret)
3872                        ret = 1;
3873
3874        } else {
3875                /*
3876                 * this gets tricky, we have to make sure the journal list in
3877                 * the inode still exists.  We know the list is still around
3878                 * if we've got a larger transaction id than the oldest list
3879                 */
3880flush_commit_only:
3881                if (journal_list_still_alive(inode->i_sb, id)) {
3882                        /*
3883                         * we only set ret to 1 when we know for sure
3884                         * the barrier hasn't been started yet on the commit
3885                         * block.
3886                         */
3887                        if (atomic_read(&jl->j_commit_left) > 1)
3888                                ret = 1;
3889                        flush_commit_list(sb, jl, 1);
3890                        if (journal->j_errno)
3891                                ret = journal->j_errno;
3892                }
3893        }
3894        /* otherwise the list is gone, and long since committed */
3895        return ret;
3896}
3897
3898int reiserfs_commit_for_inode(struct inode *inode)
3899{
3900        unsigned int id = REISERFS_I(inode)->i_trans_id;
3901        struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3902
3903        /*
3904         * for the whole inode, assume unset id means it was
3905         * changed in the current transaction.  More conservative
3906         */
3907        if (!id || !jl) {
3908                reiserfs_update_inode_transaction(inode);
3909                id = REISERFS_I(inode)->i_trans_id;
3910                /* jl will be updated in __commit_trans_jl */
3911        }
3912
3913        return __commit_trans_jl(inode, id, jl);
3914}
3915
3916void reiserfs_restore_prepared_buffer(struct super_block *sb,
3917                                      struct buffer_head *bh)
3918{
3919        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3920        PROC_INFO_INC(sb, journal.restore_prepared);
3921        if (!bh) {
3922                return;
3923        }
3924        if (test_clear_buffer_journal_restore_dirty(bh) &&
3925            buffer_journal_dirty(bh)) {
3926                struct reiserfs_journal_cnode *cn;
3927                reiserfs_write_lock(sb);
3928                cn = get_journal_hash_dev(sb,
3929                                          journal->j_list_hash_table,
3930                                          bh->b_blocknr);
3931                if (cn && can_dirty(cn)) {
3932                        set_buffer_journal_test(bh);
3933                        mark_buffer_dirty(bh);
3934                }
3935                reiserfs_write_unlock(sb);
3936        }
3937        clear_buffer_journal_prepared(bh);
3938}
3939
3940extern struct tree_balance *cur_tb;
3941/*
3942 * before we can change a metadata block, we have to make sure it won't
3943 * be written to disk while we are altering it.  So, we must:
3944 * clean it
3945 * wait on it.
3946 */
3947int reiserfs_prepare_for_journal(struct super_block *sb,
3948                                 struct buffer_head *bh, int wait)
3949{
3950        PROC_INFO_INC(sb, journal.prepare);
3951
3952        if (!trylock_buffer(bh)) {
3953                if (!wait)
3954                        return 0;
3955                lock_buffer(bh);
3956        }
3957        set_buffer_journal_prepared(bh);
3958        if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3959                clear_buffer_journal_test(bh);
3960                set_buffer_journal_restore_dirty(bh);
3961        }
3962        unlock_buffer(bh);
3963        return 1;
3964}
3965
3966/*
3967 * long and ugly.  If flush, will not return until all commit
3968 * blocks and all real buffers in the trans are on disk.
3969 * If no_async, won't return until all commit blocks are on disk.
3970 *
3971 * keep reading, there are comments as you go along
3972 *
3973 * If the journal is aborted, we just clean up. Things like flushing
3974 * journal lists, etc just won't happen.
3975 */
3976static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3977{
3978        struct super_block *sb = th->t_super;
3979        struct reiserfs_journal *journal = SB_JOURNAL(sb);
3980        struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3981        struct reiserfs_journal_cnode *last_cn = NULL;
3982        struct reiserfs_journal_desc *desc;
3983        struct reiserfs_journal_commit *commit;
3984        struct buffer_head *c_bh;       /* commit bh */
3985        struct buffer_head *d_bh;       /* desc bh */
3986        int cur_write_start = 0;        /* start index of current log write */
3987        int old_start;
3988        int i;
3989        int flush;
3990        int wait_on_commit;
3991        struct reiserfs_journal_list *jl, *temp_jl;
3992        struct list_head *entry, *safe;
3993        unsigned long jindex;
3994        unsigned int commit_trans_id;
3995        int trans_half;
3996        int depth;
3997
3998        BUG_ON(th->t_refcount > 1);
3999        BUG_ON(!th->t_trans_id);
4000        BUG_ON(!th->t_super);
4001
4002        /*
4003         * protect flush_older_commits from doing mistakes if the
4004         * transaction ID counter gets overflowed.
4005         */
4006        if (th->t_trans_id == ~0U)
4007                flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4008        flush = flags & FLUSH_ALL;
4009        wait_on_commit = flags & WAIT;
4010
4011        current->journal_info = th->t_handle_save;
4012        reiserfs_check_lock_depth(sb, "journal end");
4013        if (journal->j_len == 0) {
4014                reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4015                                             1);
4016                journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4017        }
4018
4019        lock_journal(sb);
4020        if (journal->j_next_full_flush) {
4021                flags |= FLUSH_ALL;
4022                flush = 1;
4023        }
4024        if (journal->j_next_async_flush) {
4025                flags |= COMMIT_NOW | WAIT;
4026                wait_on_commit = 1;
4027        }
4028
4029        /*
4030         * check_journal_end locks the journal, and unlocks if it does
4031         * not return 1 it tells us if we should continue with the
4032         * journal_end, or just return
4033         */
4034        if (!check_journal_end(th, flags)) {
4035                reiserfs_schedule_old_flush(sb);
4036                wake_queued_writers(sb);
4037                reiserfs_async_progress_wait(sb);
4038                goto out;
4039        }
4040
4041        /* check_journal_end might set these, check again */
4042        if (journal->j_next_full_flush) {
4043                flush = 1;
4044        }
4045
4046        /*
4047         * j must wait means we have to flush the log blocks, and the
4048         * real blocks for this transaction
4049         */
4050        if (journal->j_must_wait > 0) {
4051                flush = 1;
4052        }
4053#ifdef REISERFS_PREALLOCATE
4054        /*
4055         * quota ops might need to nest, setup the journal_info pointer
4056         * for them and raise the refcount so that it is > 0.
4057         */
4058        current->journal_info = th;
4059        th->t_refcount++;
4060
4061        /* it should not involve new blocks into the transaction */
4062        reiserfs_discard_all_prealloc(th);
4063
4064        th->t_refcount--;
4065        current->journal_info = th->t_handle_save;
4066#endif
4067
4068        /* setup description block */
4069        d_bh =
4070            journal_getblk(sb,
4071                           SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4072                           journal->j_start);
4073        set_buffer_uptodate(d_bh);
4074        desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4075        memset(d_bh->b_data, 0, d_bh->b_size);
4076        memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4077        set_desc_trans_id(desc, journal->j_trans_id);
4078
4079        /*
4080         * setup commit block.  Don't write (keep it clean too) this one
4081         * until after everyone else is written
4082         */
4083        c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4084                              ((journal->j_start + journal->j_len +
4085                                1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4086        commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4087        memset(c_bh->b_data, 0, c_bh->b_size);
4088        set_commit_trans_id(commit, journal->j_trans_id);
4089        set_buffer_uptodate(c_bh);
4090
4091        /* init this journal list */
4092        jl = journal->j_current_jl;
4093
4094        /*
4095         * we lock the commit before doing anything because
4096         * we want to make sure nobody tries to run flush_commit_list until
4097         * the new transaction is fully setup, and we've already flushed the
4098         * ordered bh list
4099         */
4100        reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4101
4102        /* save the transaction id in case we need to commit it later */
4103        commit_trans_id = jl->j_trans_id;
4104
4105        atomic_set(&jl->j_older_commits_done, 0);
4106        jl->j_trans_id = journal->j_trans_id;
4107        jl->j_timestamp = journal->j_trans_start_time;
4108        jl->j_commit_bh = c_bh;
4109        jl->j_start = journal->j_start;
4110        jl->j_len = journal->j_len;
4111        atomic_set(&jl->j_nonzerolen, journal->j_len);
4112        atomic_set(&jl->j_commit_left, journal->j_len + 2);
4113        jl->j_realblock = NULL;
4114
4115        /*
4116         * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4117         * for each real block, add it to the journal list hash,
4118         * copy into real block index array in the commit or desc block
4119         */
4120        trans_half = journal_trans_half(sb->s_blocksize);
4121        for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4122                if (buffer_journaled(cn->bh)) {
4123                        jl_cn = get_cnode(sb);
4124                        if (!jl_cn) {
4125                                reiserfs_panic(sb, "journal-1676",
4126                                               "get_cnode returned NULL");
4127                        }
4128                        if (i == 0) {
4129                                jl->j_realblock = jl_cn;
4130                        }
4131                        jl_cn->prev = last_cn;
4132                        jl_cn->next = NULL;
4133                        if (last_cn) {
4134                                last_cn->next = jl_cn;
4135                        }
4136                        last_cn = jl_cn;
4137                        /*
4138                         * make sure the block we are trying to log
4139                         * is not a block of journal or reserved area
4140                         */
4141                        if (is_block_in_log_or_reserved_area
4142                            (sb, cn->bh->b_blocknr)) {
4143                                reiserfs_panic(sb, "journal-2332",
4144                                               "Trying to log block %lu, "
4145                                               "which is a log block",
4146                                               cn->bh->b_blocknr);
4147                        }
4148                        jl_cn->blocknr = cn->bh->b_blocknr;
4149                        jl_cn->state = 0;
4150                        jl_cn->sb = sb;
4151                        jl_cn->bh = cn->bh;
4152                        jl_cn->jlist = jl;
4153                        insert_journal_hash(journal->j_list_hash_table, jl_cn);
4154                        if (i < trans_half) {
4155                                desc->j_realblock[i] =
4156                                    cpu_to_le32(cn->bh->b_blocknr);
4157                        } else {
4158                                commit->j_realblock[i - trans_half] =
4159                                    cpu_to_le32(cn->bh->b_blocknr);
4160                        }
4161                } else {
4162                        i--;
4163                }
4164        }
4165        set_desc_trans_len(desc, journal->j_len);
4166        set_desc_mount_id(desc, journal->j_mount_id);
4167        set_desc_trans_id(desc, journal->j_trans_id);
4168        set_commit_trans_len(commit, journal->j_len);
4169
4170        /*
4171         * special check in case all buffers in the journal
4172         * were marked for not logging
4173         */
4174        BUG_ON(journal->j_len == 0);
4175
4176        /*
4177         * we're about to dirty all the log blocks, mark the description block
4178         * dirty now too.  Don't mark the commit block dirty until all the
4179         * others are on disk
4180         */
4181        mark_buffer_dirty(d_bh);
4182
4183        /*
4184         * first data block is j_start + 1, so add one to
4185         * cur_write_start wherever you use it
4186         */
4187        cur_write_start = journal->j_start;
4188        cn = journal->j_first;
4189        jindex = 1;     /* start at one so we don't get the desc again */
4190        while (cn) {
4191                clear_buffer_journal_new(cn->bh);
4192                /* copy all the real blocks into log area.  dirty log blocks */
4193                if (buffer_journaled(cn->bh)) {
4194                        struct buffer_head *tmp_bh;
4195                        char *addr;
4196                        struct page *page;
4197                        tmp_bh =
4198                            journal_getblk(sb,
4199                                           SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4200                                           ((cur_write_start +
4201                                             jindex) %
4202                                            SB_ONDISK_JOURNAL_SIZE(sb)));
4203                        set_buffer_uptodate(tmp_bh);
4204                        page = cn->bh->b_page;
4205                        addr = kmap(page);
4206                        memcpy(tmp_bh->b_data,
4207                               addr + offset_in_page(cn->bh->b_data),
4208                               cn->bh->b_size);
4209                        kunmap(page);
4210                        mark_buffer_dirty(tmp_bh);
4211                        jindex++;
4212                        set_buffer_journal_dirty(cn->bh);
4213                        clear_buffer_journaled(cn->bh);
4214                } else {
4215                        /*
4216                         * JDirty cleared sometime during transaction.
4217                         * don't log this one
4218                         */
4219                        reiserfs_warning(sb, "journal-2048",
4220                                         "BAD, buffer in journal hash, "
4221                                         "but not JDirty!");
4222                        brelse(cn->bh);
4223                }
4224                next = cn->next;
4225                free_cnode(sb, cn);
4226                cn = next;
4227                reiserfs_cond_resched(sb);
4228        }
4229
4230        /*
4231         * we are done with both the c_bh and d_bh, but
4232         * c_bh must be written after all other commit blocks,
4233         * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4234         */
4235
4236        journal->j_current_jl = alloc_journal_list(sb);
4237
4238        /* now it is safe to insert this transaction on the main list */
4239        list_add_tail(&jl->j_list, &journal->j_journal_list);
4240        list_add_tail(&jl->j_working_list, &journal->j_working_list);
4241        journal->j_num_work_lists++;
4242
4243        /* reset journal values for the next transaction */
4244        old_start = journal->j_start;
4245        journal->j_start =
4246            (journal->j_start + journal->j_len +
4247             2) % SB_ONDISK_JOURNAL_SIZE(sb);
4248        atomic_set(&journal->j_wcount, 0);
4249        journal->j_bcount = 0;
4250        journal->j_last = NULL;
4251        journal->j_first = NULL;
4252        journal->j_len = 0;
4253        journal->j_trans_start_time = 0;
4254        /* check for trans_id overflow */
4255        if (++journal->j_trans_id == 0)
4256                journal->j_trans_id = 10;
4257        journal->j_current_jl->j_trans_id = journal->j_trans_id;
4258        journal->j_must_wait = 0;
4259        journal->j_len_alloc = 0;
4260        journal->j_next_full_flush = 0;
4261        journal->j_next_async_flush = 0;
4262        init_journal_hash(sb);
4263
4264        /*
4265         * make sure reiserfs_add_jh sees the new current_jl before we
4266         * write out the tails
4267         */
4268        smp_mb();
4269
4270        /*
4271         * tail conversion targets have to hit the disk before we end the
4272         * transaction.  Otherwise a later transaction might repack the tail
4273         * before this transaction commits, leaving the data block unflushed
4274         * and clean, if we crash before the later transaction commits, the
4275         * data block is lost.
4276         */
4277        if (!list_empty(&jl->j_tail_bh_list)) {
4278                depth = reiserfs_write_unlock_nested(sb);
4279                write_ordered_buffers(&journal->j_dirty_buffers_lock,
4280                                      journal, jl, &jl->j_tail_bh_list);
4281                reiserfs_write_lock_nested(sb, depth);
4282        }
4283        BUG_ON(!list_empty(&jl->j_tail_bh_list));
4284        mutex_unlock(&jl->j_commit_mutex);
4285
4286        /*
4287         * honor the flush wishes from the caller, simple commits can
4288         * be done outside the journal lock, they are done below
4289         *
4290         * if we don't flush the commit list right now, we put it into
4291         * the work queue so the people waiting on the async progress work
4292         * queue don't wait for this proc to flush journal lists and such.
4293         */
4294        if (flush) {
4295                flush_commit_list(sb, jl, 1);
4296                flush_journal_list(sb, jl, 1);
4297        } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4298                /*
4299                 * Avoid queueing work when sb is being shut down. Transaction
4300                 * will be flushed on journal shutdown.
4301                 */
4302                if (sb->s_flags & MS_ACTIVE)
4303                        queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4304                                           &journal->j_work, HZ / 10);
4305        }
4306
4307        /*
4308         * if the next transaction has any chance of wrapping, flush
4309         * transactions that might get overwritten.  If any journal lists
4310         * are very old flush them as well.
4311         */
4312first_jl:
4313        list_for_each_safe(entry, safe, &journal->j_journal_list) {
4314                temp_jl = JOURNAL_LIST_ENTRY(entry);
4315                if (journal->j_start <= temp_jl->j_start) {
4316                        if ((journal->j_start + journal->j_trans_max + 1) >=
4317                            temp_jl->j_start) {
4318                                flush_used_journal_lists(sb, temp_jl);
4319                                goto first_jl;
4320                        } else if ((journal->j_start +
4321                                    journal->j_trans_max + 1) <
4322                                   SB_ONDISK_JOURNAL_SIZE(sb)) {
4323                                /*
4324                                 * if we don't cross into the next
4325                                 * transaction and we don't wrap, there is
4326                                 * no way we can overlap any later transactions
4327                                 * break now
4328                                 */
4329                                break;
4330                        }
4331                } else if ((journal->j_start +
4332                            journal->j_trans_max + 1) >
4333                           SB_ONDISK_JOURNAL_SIZE(sb)) {
4334                        if (((journal->j_start + journal->j_trans_max + 1) %
4335                             SB_ONDISK_JOURNAL_SIZE(sb)) >=
4336                            temp_jl->j_start) {
4337                                flush_used_journal_lists(sb, temp_jl);
4338                                goto first_jl;
4339                        } else {
4340                                /*
4341                                * we don't overlap anything from out start
4342                                * to the end of the log, and our wrapped
4343                                * portion doesn't overlap anything at
4344                                * the start of the log.  We can break
4345                                */
4346                                break;
4347                        }
4348                }
4349        }
4350
4351        journal->j_current_jl->j_list_bitmap =
4352            get_list_bitmap(sb, journal->j_current_jl);
4353
4354        if (!(journal->j_current_jl->j_list_bitmap)) {
4355                reiserfs_panic(sb, "journal-1996",
4356                               "could not get a list bitmap");
4357        }
4358
4359        atomic_set(&journal->j_jlock, 0);
4360        unlock_journal(sb);
4361        /* wake up any body waiting to join. */
4362        clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4363        wake_up(&journal->j_join_wait);
4364
4365        if (!flush && wait_on_commit &&
4366            journal_list_still_alive(sb, commit_trans_id)) {
4367                flush_commit_list(sb, jl, 1);
4368        }
4369out:
4370        reiserfs_check_lock_depth(sb, "journal end2");
4371
4372        memset(th, 0, sizeof(*th));
4373        /*
4374         * Re-set th->t_super, so we can properly keep track of how many
4375         * persistent transactions there are. We need to do this so if this
4376         * call is part of a failed restart_transaction, we can free it later
4377         */
4378        th->t_super = sb;
4379
4380        return journal->j_errno;
4381}
4382
4383/* Send the file system read only and refuse new transactions */
4384void reiserfs_abort_journal(struct super_block *sb, int errno)
4385{
4386        struct reiserfs_journal *journal = SB_JOURNAL(sb);
4387        if (test_bit(J_ABORTED, &journal->j_state))
4388                return;
4389
4390        if (!journal->j_errno)
4391                journal->j_errno = errno;
4392
4393        sb->s_flags |= MS_RDONLY;
4394        set_bit(J_ABORTED, &journal->j_state);
4395
4396#ifdef CONFIG_REISERFS_CHECK
4397        dump_stack();
4398#endif
4399}
4400