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journal.c

/*
** Write ahead logging implementation copyright Chris Mason 2000
**
** The background commits make this code very interelated, and
** overly complex.  I need to rethink things a bit....The major players:
**
** journal_begin -- call with the number of blocks you expect to log.
**                  If the current transaction is too
**              old, it will block until the current transaction is
**              finished, and then start a new one.
**              Usually, your transaction will get joined in with
**                  previous ones for speed.
**
** journal_join  -- same as journal_begin, but won't block on the current
**                  transaction regardless of age.  Don't ever call
**                  this.  Ever.  There are only two places it should be
**                  called from, and they are both inside this file.
**
** journal_mark_dirty -- adds blocks into this transaction.  clears any flags
**                       that might make them get sent to disk
**                       and then marks them BH_JDirty.  Puts the buffer head
**                       into the current transaction hash.
**
** journal_end -- if the current transaction is batchable, it does nothing
**                   otherwise, it could do an async/synchronous commit, or
**                   a full flush of all log and real blocks in the
**                   transaction.
**
** flush_old_commits -- if the current transaction is too old, it is ended and
**                      commit blocks are sent to disk.  Forces commit blocks
**                      to disk for all backgrounded commits that have been
**                      around too long.
**               -- Note, if you call this as an immediate flush from
**                  from within kupdate, it will ignore the immediate flag
*/

#include <linux/time.h>
#include <linux/semaphore.h>
#include <linux/vmalloc.h>
#include <linux/reiserfs_fs.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/workqueue.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/uaccess.h>

#include <asm/system.h>

/* gets a struct reiserfs_journal_list * from a list head */
#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
                               j_list))
#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
                               j_working_list))

/* the number of mounted filesystems.  This is used to decide when to
** start and kill the commit workqueue
*/
static int reiserfs_mounted_fs_count;

static struct workqueue_struct *commit_wq;

#define JOURNAL_TRANS_HALF 1018     /* must be correct to keep the desc and commit
                           structs at 4k */
#define BUFNR 64        /*read ahead */

/* cnode stat bits.  Move these into reiserfs_fs.h */

#define BLOCK_FREED 2         /* this block was freed, and can't be written.  */
#define BLOCK_FREED_HOLDER 3  /* this block was freed during this transaction, and can't be written */

#define BLOCK_NEEDS_FLUSH 4   /* used in flush_journal_list */
#define BLOCK_DIRTIED 5

/* journal list state bits */
#define LIST_TOUCHED 1
#define LIST_DIRTY   2
#define LIST_COMMIT_PENDING  4      /* someone will commit this list */

/* flags for do_journal_end */
#define FLUSH_ALL   1         /* flush commit and real blocks */
#define COMMIT_NOW  2         /* end and commit this transaction */
#define WAIT        4         /* wait for the log blocks to hit the disk */

static int do_journal_end(struct reiserfs_transaction_handle *,
                    struct super_block *, unsigned long nblocks,
                    int flags);
static int flush_journal_list(struct super_block *s,
                        struct reiserfs_journal_list *jl, int flushall);
static int flush_commit_list(struct super_block *s,
                       struct reiserfs_journal_list *jl, int flushall);
static int can_dirty(struct reiserfs_journal_cnode *cn);
static int journal_join(struct reiserfs_transaction_handle *th,
                  struct super_block *sb, unsigned long nblocks);
static int release_journal_dev(struct super_block *super,
                         struct reiserfs_journal *journal);
static int dirty_one_transaction(struct super_block *s,
                         struct reiserfs_journal_list *jl);
static void flush_async_commits(struct work_struct *work);
static void queue_log_writer(struct super_block *s);

/* values for join in do_journal_begin_r */
enum {
      JBEGIN_REG = 0,         /* regular journal begin */
      JBEGIN_JOIN = 1,  /* join the running transaction if at all possible */
      JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
};

static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
                        struct super_block *sb,
                        unsigned long nblocks, int join);

static void init_journal_hash(struct super_block *sb)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      memset(journal->j_hash_table, 0,
             JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
}

/*
** clears BH_Dirty and sticks the buffer on the clean list.  Called because I can't allow refile_buffer to
** make schedule happen after I've freed a block.  Look at remove_from_transaction and journal_mark_freed for
** more details.
*/
static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
{
      if (bh) {
            clear_buffer_dirty(bh);
            clear_buffer_journal_test(bh);
      }
      return 0;
}

static void disable_barrier(struct super_block *s)
{
      REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
      printk("reiserfs: disabling flush barriers on %s\n",
             reiserfs_bdevname(s));
}

static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
                                           *sb)
{
      struct reiserfs_bitmap_node *bn;
      static int id;

      bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
      if (!bn) {
            return NULL;
      }
      bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
      if (!bn->data) {
            kfree(bn);
            return NULL;
      }
      bn->id = id++;
      INIT_LIST_HEAD(&bn->list);
      return bn;
}

static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_bitmap_node *bn = NULL;
      struct list_head *entry = journal->j_bitmap_nodes.next;

      journal->j_used_bitmap_nodes++;
      repeat:

      if (entry != &journal->j_bitmap_nodes) {
            bn = list_entry(entry, struct reiserfs_bitmap_node, list);
            list_del(entry);
            memset(bn->data, 0, sb->s_blocksize);
            journal->j_free_bitmap_nodes--;
            return bn;
      }
      bn = allocate_bitmap_node(sb);
      if (!bn) {
            yield();
            goto repeat;
      }
      return bn;
}
static inline void free_bitmap_node(struct super_block *sb,
                            struct reiserfs_bitmap_node *bn)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      journal->j_used_bitmap_nodes--;
      if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
            kfree(bn->data);
            kfree(bn);
      } else {
            list_add(&bn->list, &journal->j_bitmap_nodes);
            journal->j_free_bitmap_nodes++;
      }
}

static void allocate_bitmap_nodes(struct super_block *sb)
{
      int i;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_bitmap_node *bn = NULL;
      for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
            bn = allocate_bitmap_node(sb);
            if (bn) {
                  list_add(&bn->list, &journal->j_bitmap_nodes);
                  journal->j_free_bitmap_nodes++;
            } else {
                  break;      /* this is ok, we'll try again when more are needed */
            }
      }
}

static int set_bit_in_list_bitmap(struct super_block *sb,
                          b_blocknr_t block,
                          struct reiserfs_list_bitmap *jb)
{
      unsigned int bmap_nr = block / (sb->s_blocksize << 3);
      unsigned int bit_nr = block % (sb->s_blocksize << 3);

      if (!jb->bitmaps[bmap_nr]) {
            jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
      }
      set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
      return 0;
}

static void cleanup_bitmap_list(struct super_block *sb,
                        struct reiserfs_list_bitmap *jb)
{
      int i;
      if (jb->bitmaps == NULL)
            return;

      for (i = 0; i < reiserfs_bmap_count(sb); i++) {
            if (jb->bitmaps[i]) {
                  free_bitmap_node(sb, jb->bitmaps[i]);
                  jb->bitmaps[i] = NULL;
            }
      }
}

/*
** only call this on FS unmount.
*/
static int free_list_bitmaps(struct super_block *sb,
                       struct reiserfs_list_bitmap *jb_array)
{
      int i;
      struct reiserfs_list_bitmap *jb;
      for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
            jb = jb_array + i;
            jb->journal_list = NULL;
            cleanup_bitmap_list(sb, jb);
            vfree(jb->bitmaps);
            jb->bitmaps = NULL;
      }
      return 0;
}

static int free_bitmap_nodes(struct super_block *sb)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct list_head *next = journal->j_bitmap_nodes.next;
      struct reiserfs_bitmap_node *bn;

      while (next != &journal->j_bitmap_nodes) {
            bn = list_entry(next, struct reiserfs_bitmap_node, list);
            list_del(next);
            kfree(bn->data);
            kfree(bn);
            next = journal->j_bitmap_nodes.next;
            journal->j_free_bitmap_nodes--;
      }

      return 0;
}

/*
** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
** jb_array is the array to be filled in.
*/
int reiserfs_allocate_list_bitmaps(struct super_block *sb,
                           struct reiserfs_list_bitmap *jb_array,
                           unsigned int bmap_nr)
{
      int i;
      int failed = 0;
      struct reiserfs_list_bitmap *jb;
      int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);

      for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
            jb = jb_array + i;
            jb->journal_list = NULL;
            jb->bitmaps = vmalloc(mem);
            if (!jb->bitmaps) {
                  reiserfs_warning(sb, "clm-2000", "unable to "
                               "allocate bitmaps for journal lists");
                  failed = 1;
                  break;
            }
            memset(jb->bitmaps, 0, mem);
      }
      if (failed) {
            free_list_bitmaps(sb, jb_array);
            return -1;
      }
      return 0;
}

/*
** find an available list bitmap.  If you can't find one, flush a commit list
** and try again
*/
static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
                                        struct reiserfs_journal_list
                                        *jl)
{
      int i, j;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_list_bitmap *jb = NULL;

      for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
            i = journal->j_list_bitmap_index;
            journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
            jb = journal->j_list_bitmap + i;
            if (journal->j_list_bitmap[i].journal_list) {
                  flush_commit_list(sb,
                                journal->j_list_bitmap[i].
                                journal_list, 1);
                  if (!journal->j_list_bitmap[i].journal_list) {
                        break;
                  }
            } else {
                  break;
            }
      }
      if (jb->journal_list) { /* double check to make sure if flushed correctly */
            return NULL;
      }
      jb->journal_list = jl;
      return jb;
}

/*
** allocates a new chunk of X nodes, and links them all together as a list.
** Uses the cnode->next and cnode->prev pointers
** returns NULL on failure
*/
static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
{
      struct reiserfs_journal_cnode *head;
      int i;
      if (num_cnodes <= 0) {
            return NULL;
      }
      head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
      if (!head) {
            return NULL;
      }
      memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
      head[0].prev = NULL;
      head[0].next = head + 1;
      for (i = 1; i < num_cnodes; i++) {
            head[i].prev = head + (i - 1);
            head[i].next = head + (i + 1);      /* if last one, overwrite it after the if */
      }
      head[num_cnodes - 1].next = NULL;
      return head;
}

/*
** pulls a cnode off the free list, or returns NULL on failure
*/
static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
{
      struct reiserfs_journal_cnode *cn;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);

      reiserfs_check_lock_depth(sb, "get_cnode");

      if (journal->j_cnode_free <= 0) {
            return NULL;
      }
      journal->j_cnode_used++;
      journal->j_cnode_free--;
      cn = journal->j_cnode_free_list;
      if (!cn) {
            return cn;
      }
      if (cn->next) {
            cn->next->prev = NULL;
      }
      journal->j_cnode_free_list = cn->next;
      memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
      return cn;
}

/*
** returns a cnode to the free list
*/
static void free_cnode(struct super_block *sb,
                   struct reiserfs_journal_cnode *cn)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);

      reiserfs_check_lock_depth(sb, "free_cnode");

      journal->j_cnode_used--;
      journal->j_cnode_free++;
      /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
      cn->next = journal->j_cnode_free_list;
      if (journal->j_cnode_free_list) {
            journal->j_cnode_free_list->prev = cn;
      }
      cn->prev = NULL;  /* not needed with the memset, but I might kill the memset, and forget to do this */
      journal->j_cnode_free_list = cn;
}

static void clear_prepared_bits(struct buffer_head *bh)
{
      clear_buffer_journal_prepared(bh);
      clear_buffer_journal_restore_dirty(bh);
}

/* utility function to force a BUG if it is called without the big
** kernel lock held.  caller is the string printed just before calling BUG()
*/
void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
{
#ifdef CONFIG_SMP
      if (current->lock_depth < 0) {
            reiserfs_panic(sb, "journal-1", "%s called without kernel "
                         "lock held", caller);
      }
#else
      ;
#endif
}

/* return a cnode with same dev, block number and size in table, or null if not found */
static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
                                                  super_block
                                                  *sb,
                                                  struct
                                                  reiserfs_journal_cnode
                                                  **table,
                                                  long bl)
{
      struct reiserfs_journal_cnode *cn;
      cn = journal_hash(table, sb, bl);
      while (cn) {
            if (cn->blocknr == bl && cn->sb == sb)
                  return cn;
            cn = cn->hnext;
      }
      return (struct reiserfs_journal_cnode *)0;
}

/*
** this actually means 'can this block be reallocated yet?'.  If you set search_all, a block can only be allocated
** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
** being overwritten by a replay after crashing.
**
** If you don't set search_all, a block can only be allocated if it is not in the current transaction.  Since deleting
** a block removes it from the current transaction, this case should never happen.  If you don't set search_all, make
** sure you never write the block without logging it.
**
** next_zero_bit is a suggestion about the next block to try for find_forward.
** when bl is rejected because it is set in a journal list bitmap, we search
** for the next zero bit in the bitmap that rejected bl.  Then, we return that
** through next_zero_bit for find_forward to try.
**
** Just because we return something in next_zero_bit does not mean we won't
** reject it on the next call to reiserfs_in_journal
**
*/
int reiserfs_in_journal(struct super_block *sb,
                  unsigned int bmap_nr, int bit_nr, int search_all,
                  b_blocknr_t * next_zero_bit)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_journal_cnode *cn;
      struct reiserfs_list_bitmap *jb;
      int i;
      unsigned long bl;

      *next_zero_bit = 0;     /* always start this at zero. */

      PROC_INFO_INC(sb, journal.in_journal);
      /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
       ** if we crash before the transaction that freed it commits,  this transaction won't
       ** have committed either, and the block will never be written
       */
      if (search_all) {
            for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
                  PROC_INFO_INC(sb, journal.in_journal_bitmap);
                  jb = journal->j_list_bitmap + i;
                  if (jb->journal_list && jb->bitmaps[bmap_nr] &&
                      test_bit(bit_nr,
                             (unsigned long *)jb->bitmaps[bmap_nr]->
                             data)) {
                        *next_zero_bit =
                            find_next_zero_bit((unsigned long *)
                                           (jb->bitmaps[bmap_nr]->
                                          data),
                                           sb->s_blocksize << 3,
                                           bit_nr + 1);
                        return 1;
                  }
            }
      }

      bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
      /* is it in any old transactions? */
      if (search_all
          && (cn =
            get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
            return 1;
      }

      /* is it in the current transaction.  This should never happen */
      if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
            BUG();
            return 1;
      }

      PROC_INFO_INC(sb, journal.in_journal_reusable);
      /* safe for reuse */
      return 0;
}

/* insert cn into table
*/
static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
                               struct reiserfs_journal_cnode *cn)
{
      struct reiserfs_journal_cnode *cn_orig;

      cn_orig = journal_hash(table, cn->sb, cn->blocknr);
      cn->hnext = cn_orig;
      cn->hprev = NULL;
      if (cn_orig) {
            cn_orig->hprev = cn;
      }
      journal_hash(table, cn->sb, cn->blocknr) = cn;
}

/* lock the current transaction */
static inline void lock_journal(struct super_block *sb)
{
      PROC_INFO_INC(sb, journal.lock_journal);
      mutex_lock(&SB_JOURNAL(sb)->j_mutex);
}

/* unlock the current transaction */
static inline void unlock_journal(struct super_block *sb)
{
      mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
}

static inline void get_journal_list(struct reiserfs_journal_list *jl)
{
      jl->j_refcount++;
}

static inline void put_journal_list(struct super_block *s,
                            struct reiserfs_journal_list *jl)
{
      if (jl->j_refcount < 1) {
            reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
                         jl->j_trans_id, jl->j_refcount);
      }
      if (--jl->j_refcount == 0)
            kfree(jl);
}

/*
** this used to be much more involved, and I'm keeping it just in case things get ugly again.
** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
** transaction.
*/
static void cleanup_freed_for_journal_list(struct super_block *sb,
                                 struct reiserfs_journal_list *jl)
{

      struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
      if (jb) {
            cleanup_bitmap_list(sb, jb);
      }
      jl->j_list_bitmap->journal_list = NULL;
      jl->j_list_bitmap = NULL;
}

static int journal_list_still_alive(struct super_block *s,
                            unsigned int trans_id)
{
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      struct list_head *entry = &journal->j_journal_list;
      struct reiserfs_journal_list *jl;

      if (!list_empty(entry)) {
            jl = JOURNAL_LIST_ENTRY(entry->next);
            if (jl->j_trans_id <= trans_id) {
                  return 1;
            }
      }
      return 0;
}

/*
 * If page->mapping was null, we failed to truncate this page for
 * some reason.  Most likely because it was truncated after being
 * logged via data=journal.
 *
 * This does a check to see if the buffer belongs to one of these
 * lost pages before doing the final put_bh.  If page->mapping was
 * null, it tries to free buffers on the page, which should make the
 * final page_cache_release drop the page from the lru.
 */
static void release_buffer_page(struct buffer_head *bh)
{
      struct page *page = bh->b_page;
      if (!page->mapping && trylock_page(page)) {
            page_cache_get(page);
            put_bh(bh);
            if (!page->mapping)
                  try_to_free_buffers(page);
            unlock_page(page);
            page_cache_release(page);
      } else {
            put_bh(bh);
      }
}

static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
{
      char b[BDEVNAME_SIZE];

      if (buffer_journaled(bh)) {
            reiserfs_warning(NULL, "clm-2084",
                         "pinned buffer %lu:%s sent to disk",
                         bh->b_blocknr, bdevname(bh->b_bdev, b));
      }
      if (uptodate)
            set_buffer_uptodate(bh);
      else
            clear_buffer_uptodate(bh);

      unlock_buffer(bh);
      release_buffer_page(bh);
}

static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
{
      if (uptodate)
            set_buffer_uptodate(bh);
      else
            clear_buffer_uptodate(bh);
      unlock_buffer(bh);
      put_bh(bh);
}

static void submit_logged_buffer(struct buffer_head *bh)
{
      get_bh(bh);
      bh->b_end_io = reiserfs_end_buffer_io_sync;
      clear_buffer_journal_new(bh);
      clear_buffer_dirty(bh);
      if (!test_clear_buffer_journal_test(bh))
            BUG();
      if (!buffer_uptodate(bh))
            BUG();
      submit_bh(WRITE, bh);
}

static void submit_ordered_buffer(struct buffer_head *bh)
{
      get_bh(bh);
      bh->b_end_io = reiserfs_end_ordered_io;
      clear_buffer_dirty(bh);
      if (!buffer_uptodate(bh))
            BUG();
      submit_bh(WRITE, bh);
}

static int submit_barrier_buffer(struct buffer_head *bh)
{
      get_bh(bh);
      bh->b_end_io = reiserfs_end_ordered_io;
      clear_buffer_dirty(bh);
      if (!buffer_uptodate(bh))
            BUG();
      return submit_bh(WRITE_BARRIER, bh);
}

static void check_barrier_completion(struct super_block *s,
                             struct buffer_head *bh)
{
      if (buffer_eopnotsupp(bh)) {
            clear_buffer_eopnotsupp(bh);
            disable_barrier(s);
            set_buffer_uptodate(bh);
            set_buffer_dirty(bh);
            sync_dirty_buffer(bh);
      }
}

#define CHUNK_SIZE 32
00716 struct buffer_chunk {
      struct buffer_head *bh[CHUNK_SIZE];
      int nr;
};

static void write_chunk(struct buffer_chunk *chunk)
{
      int i;
      get_fs_excl();
      for (i = 0; i < chunk->nr; i++) {
            submit_logged_buffer(chunk->bh[i]);
      }
      chunk->nr = 0;
      put_fs_excl();
}

static void write_ordered_chunk(struct buffer_chunk *chunk)
{
      int i;
      get_fs_excl();
      for (i = 0; i < chunk->nr; i++) {
            submit_ordered_buffer(chunk->bh[i]);
      }
      chunk->nr = 0;
      put_fs_excl();
}

static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
                  spinlock_t * lock, void (fn) (struct buffer_chunk *))
{
      int ret = 0;
      BUG_ON(chunk->nr >= CHUNK_SIZE);
      chunk->bh[chunk->nr++] = bh;
      if (chunk->nr >= CHUNK_SIZE) {
            ret = 1;
            if (lock)
                  spin_unlock(lock);
            fn(chunk);
            if (lock)
                  spin_lock(lock);
      }
      return ret;
}

static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
static struct reiserfs_jh *alloc_jh(void)
{
      struct reiserfs_jh *jh;
      while (1) {
            jh = kmalloc(sizeof(*jh), GFP_NOFS);
            if (jh) {
                  atomic_inc(&nr_reiserfs_jh);
                  return jh;
            }
            yield();
      }
}

/*
 * we want to free the jh when the buffer has been written
 * and waited on
 */
void reiserfs_free_jh(struct buffer_head *bh)
{
      struct reiserfs_jh *jh;

      jh = bh->b_private;
      if (jh) {
            bh->b_private = NULL;
            jh->bh = NULL;
            list_del_init(&jh->list);
            kfree(jh);
            if (atomic_read(&nr_reiserfs_jh) <= 0)
                  BUG();
            atomic_dec(&nr_reiserfs_jh);
            put_bh(bh);
      }
}

static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
                     int tail)
{
      struct reiserfs_jh *jh;

      if (bh->b_private) {
            spin_lock(&j->j_dirty_buffers_lock);
            if (!bh->b_private) {
                  spin_unlock(&j->j_dirty_buffers_lock);
                  goto no_jh;
            }
            jh = bh->b_private;
            list_del_init(&jh->list);
      } else {
            no_jh:
            get_bh(bh);
            jh = alloc_jh();
            spin_lock(&j->j_dirty_buffers_lock);
            /* buffer must be locked for __add_jh, should be able to have
             * two adds at the same time
             */
            BUG_ON(bh->b_private);
            jh->bh = bh;
            bh->b_private = jh;
      }
      jh->jl = j->j_current_jl;
      if (tail)
            list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
      else {
            list_add_tail(&jh->list, &jh->jl->j_bh_list);
      }
      spin_unlock(&j->j_dirty_buffers_lock);
      return 0;
}

int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
{
      return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
}
int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
{
      return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
}

#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
static int write_ordered_buffers(spinlock_t * lock,
                         struct reiserfs_journal *j,
                         struct reiserfs_journal_list *jl,
                         struct list_head *list)
{
      struct buffer_head *bh;
      struct reiserfs_jh *jh;
      int ret = j->j_errno;
      struct buffer_chunk chunk;
      struct list_head tmp;
      INIT_LIST_HEAD(&tmp);

      chunk.nr = 0;
      spin_lock(lock);
      while (!list_empty(list)) {
            jh = JH_ENTRY(list->next);
            bh = jh->bh;
            get_bh(bh);
            if (!trylock_buffer(bh)) {
                  if (!buffer_dirty(bh)) {
                        list_move(&jh->list, &tmp);
                        goto loop_next;
                  }
                  spin_unlock(lock);
                  if (chunk.nr)
                        write_ordered_chunk(&chunk);
                  wait_on_buffer(bh);
                  cond_resched();
                  spin_lock(lock);
                  goto loop_next;
            }
            /* in theory, dirty non-uptodate buffers should never get here,
             * but the upper layer io error paths still have a few quirks.
             * Handle them here as gracefully as we can
             */
            if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
                  clear_buffer_dirty(bh);
                  ret = -EIO;
            }
            if (buffer_dirty(bh)) {
                  list_move(&jh->list, &tmp);
                  add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
            } else {
                  reiserfs_free_jh(bh);
                  unlock_buffer(bh);
            }
            loop_next:
            put_bh(bh);
            cond_resched_lock(lock);
      }
      if (chunk.nr) {
            spin_unlock(lock);
            write_ordered_chunk(&chunk);
            spin_lock(lock);
      }
      while (!list_empty(&tmp)) {
            jh = JH_ENTRY(tmp.prev);
            bh = jh->bh;
            get_bh(bh);
            reiserfs_free_jh(bh);

            if (buffer_locked(bh)) {
                  spin_unlock(lock);
                  wait_on_buffer(bh);
                  spin_lock(lock);
            }
            if (!buffer_uptodate(bh)) {
                  ret = -EIO;
            }
            /* ugly interaction with invalidatepage here.
             * reiserfs_invalidate_page will pin any buffer that has a valid
             * journal head from an older transaction.  If someone else sets
             * our buffer dirty after we write it in the first loop, and
             * then someone truncates the page away, nobody will ever write
             * the buffer. We're safe if we write the page one last time
             * after freeing the journal header.
             */
            if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
                  spin_unlock(lock);
                  ll_rw_block(WRITE, 1, &bh);
                  spin_lock(lock);
            }
            put_bh(bh);
            cond_resched_lock(lock);
      }
      spin_unlock(lock);
      return ret;
}

static int flush_older_commits(struct super_block *s,
                         struct reiserfs_journal_list *jl)
{
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      struct reiserfs_journal_list *other_jl;
      struct reiserfs_journal_list *first_jl;
      struct list_head *entry;
      unsigned int trans_id = jl->j_trans_id;
      unsigned int other_trans_id;
      unsigned int first_trans_id;

      find_first:
      /*
       * first we walk backwards to find the oldest uncommitted transation
       */
      first_jl = jl;
      entry = jl->j_list.prev;
      while (1) {
            other_jl = JOURNAL_LIST_ENTRY(entry);
            if (entry == &journal->j_journal_list ||
                atomic_read(&other_jl->j_older_commits_done))
                  break;

            first_jl = other_jl;
            entry = other_jl->j_list.prev;
      }

      /* if we didn't find any older uncommitted transactions, return now */
      if (first_jl == jl) {
            return 0;
      }

      first_trans_id = first_jl->j_trans_id;

      entry = &first_jl->j_list;
      while (1) {
            other_jl = JOURNAL_LIST_ENTRY(entry);
            other_trans_id = other_jl->j_trans_id;

            if (other_trans_id < trans_id) {
                  if (atomic_read(&other_jl->j_commit_left) != 0) {
                        flush_commit_list(s, other_jl, 0);

                        /* list we were called with is gone, return */
                        if (!journal_list_still_alive(s, trans_id))
                              return 1;

                        /* the one we just flushed is gone, this means all
                         * older lists are also gone, so first_jl is no longer
                         * valid either.  Go back to the beginning.
                         */
                        if (!journal_list_still_alive
                            (s, other_trans_id)) {
                              goto find_first;
                        }
                  }
                  entry = entry->next;
                  if (entry == &journal->j_journal_list)
                        return 0;
            } else {
                  return 0;
            }
      }
      return 0;
}

static int reiserfs_async_progress_wait(struct super_block *s)
{
      DEFINE_WAIT(wait);
      struct reiserfs_journal *j = SB_JOURNAL(s);
      if (atomic_read(&j->j_async_throttle))
            congestion_wait(BLK_RW_ASYNC, HZ / 10);
      return 0;
}

/*
** if this journal list still has commit blocks unflushed, send them to disk.
**
** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
** Before the commit block can by written, every other log block must be safely on disk
**
*/
static int flush_commit_list(struct super_block *s,
                       struct reiserfs_journal_list *jl, int flushall)
{
      int i;
      b_blocknr_t bn;
      struct buffer_head *tbh = NULL;
      unsigned int trans_id = jl->j_trans_id;
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      int barrier = 0;
      int retval = 0;
      int write_len;

      reiserfs_check_lock_depth(s, "flush_commit_list");

      if (atomic_read(&jl->j_older_commits_done)) {
            return 0;
      }

      get_fs_excl();

      /* before we can put our commit blocks on disk, we have to make sure everyone older than
       ** us is on disk too
       */
      BUG_ON(jl->j_len <= 0);
      BUG_ON(trans_id == journal->j_trans_id);

      get_journal_list(jl);
      if (flushall) {
            if (flush_older_commits(s, jl) == 1) {
                  /* list disappeared during flush_older_commits.  return */
                  goto put_jl;
            }
      }

      /* make sure nobody is trying to flush this one at the same time */
      mutex_lock(&jl->j_commit_mutex);
      if (!journal_list_still_alive(s, trans_id)) {
            mutex_unlock(&jl->j_commit_mutex);
            goto put_jl;
      }
      BUG_ON(jl->j_trans_id == 0);

      /* this commit is done, exit */
      if (atomic_read(&(jl->j_commit_left)) <= 0) {
            if (flushall) {
                  atomic_set(&(jl->j_older_commits_done), 1);
            }
            mutex_unlock(&jl->j_commit_mutex);
            goto put_jl;
      }

      if (!list_empty(&jl->j_bh_list)) {
            int ret;
            unlock_kernel();
            ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
                                  journal, jl, &jl->j_bh_list);
            if (ret < 0 && retval == 0)
                  retval = ret;
            lock_kernel();
      }
      BUG_ON(!list_empty(&jl->j_bh_list));
      /*
       * for the description block and all the log blocks, submit any buffers
       * that haven't already reached the disk.  Try to write at least 256
       * log blocks. later on, we will only wait on blocks that correspond
       * to this transaction, but while we're unplugging we might as well
       * get a chunk of data on there.
       */
      atomic_inc(&journal->j_async_throttle);
      write_len = jl->j_len + 1;
      if (write_len < 256)
            write_len = 256;
      for (i = 0 ; i < write_len ; i++) {
            bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
                SB_ONDISK_JOURNAL_SIZE(s);
            tbh = journal_find_get_block(s, bn);
            if (tbh) {
                  if (buffer_dirty(tbh))
                      ll_rw_block(WRITE, 1, &tbh) ;
                  put_bh(tbh) ;
            }
      }
      atomic_dec(&journal->j_async_throttle);

      /* We're skipping the commit if there's an error */
      if (retval || reiserfs_is_journal_aborted(journal))
            barrier = 0;

      /* wait on everything written so far before writing the commit
       * if we are in barrier mode, send the commit down now
       */
      barrier = reiserfs_barrier_flush(s);
      if (barrier) {
            int ret;
            lock_buffer(jl->j_commit_bh);
            ret = submit_barrier_buffer(jl->j_commit_bh);
            if (ret == -EOPNOTSUPP) {
                  set_buffer_uptodate(jl->j_commit_bh);
                  disable_barrier(s);
                  barrier = 0;
            }
      }
      for (i = 0; i < (jl->j_len + 1); i++) {
            bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
                (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
            tbh = journal_find_get_block(s, bn);
            wait_on_buffer(tbh);
            // since we're using ll_rw_blk above, it might have skipped over
            // a locked buffer.  Double check here
            //
            if (buffer_dirty(tbh))  /* redundant, sync_dirty_buffer() checks */
                  sync_dirty_buffer(tbh);
            if (unlikely(!buffer_uptodate(tbh))) {
#ifdef CONFIG_REISERFS_CHECK
                  reiserfs_warning(s, "journal-601",
                               "buffer write failed");
#endif
                  retval = -EIO;
            }
            put_bh(tbh);      /* once for journal_find_get_block */
            put_bh(tbh);      /* once due to original getblk in do_journal_end */
            atomic_dec(&(jl->j_commit_left));
      }

      BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);

      if (!barrier) {
            /* If there was a write error in the journal - we can't commit
             * this transaction - it will be invalid and, if successful,
             * will just end up propagating the write error out to
             * the file system. */
            if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
                  if (buffer_dirty(jl->j_commit_bh))
                        BUG();
                  mark_buffer_dirty(jl->j_commit_bh) ;
                  sync_dirty_buffer(jl->j_commit_bh) ;
            }
      } else
            wait_on_buffer(jl->j_commit_bh);

      check_barrier_completion(s, jl->j_commit_bh);

      /* If there was a write error in the journal - we can't commit this
       * transaction - it will be invalid and, if successful, will just end
       * up propagating the write error out to the filesystem. */
      if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
#ifdef CONFIG_REISERFS_CHECK
            reiserfs_warning(s, "journal-615", "buffer write failed");
#endif
            retval = -EIO;
      }
      bforget(jl->j_commit_bh);
      if (journal->j_last_commit_id != 0 &&
          (jl->j_trans_id - journal->j_last_commit_id) != 1) {
            reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
                         journal->j_last_commit_id, jl->j_trans_id);
      }
      journal->j_last_commit_id = jl->j_trans_id;

      /* now, every commit block is on the disk.  It is safe to allow blocks freed during this transaction to be reallocated */
      cleanup_freed_for_journal_list(s, jl);

      retval = retval ? retval : journal->j_errno;

      /* mark the metadata dirty */
      if (!retval)
            dirty_one_transaction(s, jl);
      atomic_dec(&(jl->j_commit_left));

      if (flushall) {
            atomic_set(&(jl->j_older_commits_done), 1);
      }
      mutex_unlock(&jl->j_commit_mutex);
      put_jl:
      put_journal_list(s, jl);

      if (retval)
            reiserfs_abort(s, retval, "Journal write error in %s",
                         __func__);
      put_fs_excl();
      return retval;
}

/*
** flush_journal_list frequently needs to find a newer transaction for a given block.  This does that, or
** returns NULL if it can't find anything
*/
static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
                                            reiserfs_journal_cnode
                                            *cn)
{
      struct super_block *sb = cn->sb;
      b_blocknr_t blocknr = cn->blocknr;

      cn = cn->hprev;
      while (cn) {
            if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
                  return cn->jlist;
            }
            cn = cn->hprev;
      }
      return NULL;
}

static int newer_jl_done(struct reiserfs_journal_cnode *cn)
{
      struct super_block *sb = cn->sb;
      b_blocknr_t blocknr = cn->blocknr;

      cn = cn->hprev;
      while (cn) {
            if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
                atomic_read(&cn->jlist->j_commit_left) != 0)
                            return 0;
            cn = cn->hprev;
      }
      return 1;
}

static void remove_journal_hash(struct super_block *,
                        struct reiserfs_journal_cnode **,
                        struct reiserfs_journal_list *, unsigned long,
                        int);

/*
** once all the real blocks have been flushed, it is safe to remove them from the
** journal list for this transaction.  Aside from freeing the cnode, this also allows the
** block to be reallocated for data blocks if it had been deleted.
*/
static void remove_all_from_journal_list(struct super_block *sb,
                               struct reiserfs_journal_list *jl,
                               int debug)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_journal_cnode *cn, *last;
      cn = jl->j_realblock;

      /* which is better, to lock once around the whole loop, or
       ** to lock for each call to remove_journal_hash?
       */
      while (cn) {
            if (cn->blocknr != 0) {
                  if (debug) {
                        reiserfs_warning(sb, "reiserfs-2201",
                                     "block %u, bh is %d, state %ld",
                                     cn->blocknr, cn->bh ? 1 : 0,
                                     cn->state);
                  }
                  cn->state = 0;
                  remove_journal_hash(sb, journal->j_list_hash_table,
                                  jl, cn->blocknr, 1);
            }
            last = cn;
            cn = cn->next;
            free_cnode(sb, last);
      }
      jl->j_realblock = NULL;
}

/*
** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
** releasing blocks in this transaction for reuse as data blocks.
** called by flush_journal_list, before it calls remove_all_from_journal_list
**
*/
static int _update_journal_header_block(struct super_block *sb,
                              unsigned long offset,
                              unsigned int trans_id)
{
      struct reiserfs_journal_header *jh;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);

      if (reiserfs_is_journal_aborted(journal))
            return -EIO;

      if (trans_id >= journal->j_last_flush_trans_id) {
            if (buffer_locked((journal->j_header_bh))) {
                  wait_on_buffer((journal->j_header_bh));
                  if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
#ifdef CONFIG_REISERFS_CHECK
                        reiserfs_warning(sb, "journal-699",
                                     "buffer write failed");
#endif
                        return -EIO;
                  }
            }
            journal->j_last_flush_trans_id = trans_id;
            journal->j_first_unflushed_offset = offset;
            jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
                                          b_data);
            jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
            jh->j_first_unflushed_offset = cpu_to_le32(offset);
            jh->j_mount_id = cpu_to_le32(journal->j_mount_id);

            if (reiserfs_barrier_flush(sb)) {
                  int ret;
                  lock_buffer(journal->j_header_bh);
                  ret = submit_barrier_buffer(journal->j_header_bh);
                  if (ret == -EOPNOTSUPP) {
                        set_buffer_uptodate(journal->j_header_bh);
                        disable_barrier(sb);
                        goto sync;
                  }
                  wait_on_buffer(journal->j_header_bh);
                  check_barrier_completion(sb, journal->j_header_bh);
            } else {
                  sync:
                  set_buffer_dirty(journal->j_header_bh);
                  sync_dirty_buffer(journal->j_header_bh);
            }
            if (!buffer_uptodate(journal->j_header_bh)) {
                  reiserfs_warning(sb, "journal-837",
                               "IO error during journal replay");
                  return -EIO;
            }
      }
      return 0;
}

static int update_journal_header_block(struct super_block *sb,
                               unsigned long offset,
                               unsigned int trans_id)
{
      return _update_journal_header_block(sb, offset, trans_id);
}

/*
** flush any and all journal lists older than you are
** can only be called from flush_journal_list
*/
static int flush_older_journal_lists(struct super_block *sb,
                             struct reiserfs_journal_list *jl)
{
      struct list_head *entry;
      struct reiserfs_journal_list *other_jl;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      unsigned int trans_id = jl->j_trans_id;

      /* we know we are the only ones flushing things, no extra race
       * protection is required.
       */
      restart:
      entry = journal->j_journal_list.next;
      /* Did we wrap? */
      if (entry == &journal->j_journal_list)
            return 0;
      other_jl = JOURNAL_LIST_ENTRY(entry);
      if (other_jl->j_trans_id < trans_id) {
            BUG_ON(other_jl->j_refcount <= 0);
            /* do not flush all */
            flush_journal_list(sb, other_jl, 0);

            /* other_jl is now deleted from the list */
            goto restart;
      }
      return 0;
}

static void del_from_work_list(struct super_block *s,
                         struct reiserfs_journal_list *jl)
{
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      if (!list_empty(&jl->j_working_list)) {
            list_del_init(&jl->j_working_list);
            journal->j_num_work_lists--;
      }
}

/* flush a journal list, both commit and real blocks
**
** always set flushall to 1, unless you are calling from inside
** flush_journal_list
**
** IMPORTANT.  This can only be called while there are no journal writers,
** and the journal is locked.  That means it can only be called from
** do_journal_end, or by journal_release
*/
static int flush_journal_list(struct super_block *s,
                        struct reiserfs_journal_list *jl, int flushall)
{
      struct reiserfs_journal_list *pjl;
      struct reiserfs_journal_cnode *cn, *last;
      int count;
      int was_jwait = 0;
      int was_dirty = 0;
      struct buffer_head *saved_bh;
      unsigned long j_len_saved = jl->j_len;
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      int err = 0;

      BUG_ON(j_len_saved <= 0);

      if (atomic_read(&journal->j_wcount) != 0) {
            reiserfs_warning(s, "clm-2048", "called with wcount %d",
                         atomic_read(&journal->j_wcount));
      }
      BUG_ON(jl->j_trans_id == 0);

      /* if flushall == 0, the lock is already held */
      if (flushall) {
            mutex_lock(&journal->j_flush_mutex);
      } else if (mutex_trylock(&journal->j_flush_mutex)) {
            BUG();
      }

      count = 0;
      if (j_len_saved > journal->j_trans_max) {
            reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
                         j_len_saved, jl->j_trans_id);
            return 0;
      }

      get_fs_excl();

      /* if all the work is already done, get out of here */
      if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
          atomic_read(&(jl->j_commit_left)) <= 0) {
            goto flush_older_and_return;
      }

      /* start by putting the commit list on disk.  This will also flush
       ** the commit lists of any olders transactions
       */
      flush_commit_list(s, jl, 1);

      if (!(jl->j_state & LIST_DIRTY)
          && !reiserfs_is_journal_aborted(journal))
            BUG();

      /* are we done now? */
      if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
          atomic_read(&(jl->j_commit_left)) <= 0) {
            goto flush_older_and_return;
      }

      /* loop through each cnode, see if we need to write it,
       ** or wait on a more recent transaction, or just ignore it
       */
      if (atomic_read(&(journal->j_wcount)) != 0) {
            reiserfs_panic(s, "journal-844", "journal list is flushing, "
                         "wcount is not 0");
      }
      cn = jl->j_realblock;
      while (cn) {
            was_jwait = 0;
            was_dirty = 0;
            saved_bh = NULL;
            /* blocknr of 0 is no longer in the hash, ignore it */
            if (cn->blocknr == 0) {
                  goto free_cnode;
            }

            /* This transaction failed commit. Don't write out to the disk */
            if (!(jl->j_state & LIST_DIRTY))
                  goto free_cnode;

            pjl = find_newer_jl_for_cn(cn);
            /* the order is important here.  We check pjl to make sure we
             ** don't clear BH_JDirty_wait if we aren't the one writing this
             ** block to disk
             */
            if (!pjl && cn->bh) {
                  saved_bh = cn->bh;

                  /* we do this to make sure nobody releases the buffer while
                   ** we are working with it
                   */
                  get_bh(saved_bh);

                  if (buffer_journal_dirty(saved_bh)) {
                        BUG_ON(!can_dirty(cn));
                        was_jwait = 1;
                        was_dirty = 1;
                  } else if (can_dirty(cn)) {
                        /* everything with !pjl && jwait should be writable */
                        BUG();
                  }
            }

            /* if someone has this block in a newer transaction, just make
             ** sure they are committed, and don't try writing it to disk
             */
            if (pjl) {
                  if (atomic_read(&pjl->j_commit_left))
                        flush_commit_list(s, pjl, 1);
                  goto free_cnode;
            }

            /* bh == NULL when the block got to disk on its own, OR,
             ** the block got freed in a future transaction
             */
            if (saved_bh == NULL) {
                  goto free_cnode;
            }

            /* this should never happen.  kupdate_one_transaction has this list
             ** locked while it works, so we should never see a buffer here that
             ** is not marked JDirty_wait
             */
            if ((!was_jwait) && !buffer_locked(saved_bh)) {
                  reiserfs_warning(s, "journal-813",
                               "BAD! buffer %llu %cdirty %cjwait, "
                               "not in a newer tranasction",
                               (unsigned long long)saved_bh->
                               b_blocknr, was_dirty ? ' ' : '!',
                               was_jwait ? ' ' : '!');
            }
            if (was_dirty) {
                  /* we inc again because saved_bh gets decremented at free_cnode */
                  get_bh(saved_bh);
                  set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
                  lock_buffer(saved_bh);
                  BUG_ON(cn->blocknr != saved_bh->b_blocknr);
                  if (buffer_dirty(saved_bh))
                        submit_logged_buffer(saved_bh);
                  else
                        unlock_buffer(saved_bh);
                  count++;
            } else {
                  reiserfs_warning(s, "clm-2082",
                               "Unable to flush buffer %llu in %s",
                               (unsigned long long)saved_bh->
                               b_blocknr, __func__);
            }
            free_cnode:
            last = cn;
            cn = cn->next;
            if (saved_bh) {
                  /* we incremented this to keep others from taking the buffer head away */
                  put_bh(saved_bh);
                  if (atomic_read(&(saved_bh->b_count)) < 0) {
                        reiserfs_warning(s, "journal-945",
                                     "saved_bh->b_count < 0");
                  }
            }
      }
      if (count > 0) {
            cn = jl->j_realblock;
            while (cn) {
                  if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
                        if (!cn->bh) {
                              reiserfs_panic(s, "journal-1011",
                                           "cn->bh is NULL");
                        }
                        wait_on_buffer(cn->bh);
                        if (!cn->bh) {
                              reiserfs_panic(s, "journal-1012",
                                           "cn->bh is NULL");
                        }
                        if (unlikely(!buffer_uptodate(cn->bh))) {
#ifdef CONFIG_REISERFS_CHECK
                              reiserfs_warning(s, "journal-949",
                                           "buffer write failed");
#endif
                              err = -EIO;
                        }
                        /* note, we must clear the JDirty_wait bit after the up to date
                         ** check, otherwise we race against our flushpage routine
                         */
                        BUG_ON(!test_clear_buffer_journal_dirty
                               (cn->bh));

                        /* drop one ref for us */
                        put_bh(cn->bh);
                        /* drop one ref for journal_mark_dirty */
                        release_buffer_page(cn->bh);
                  }
                  cn = cn->next;
            }
      }

      if (err)
            reiserfs_abort(s, -EIO,
                         "Write error while pushing transaction to disk in %s",
                         __func__);
      flush_older_and_return:

      /* before we can update the journal header block, we _must_ flush all
       ** real blocks from all older transactions to disk.  This is because
       ** once the header block is updated, this transaction will not be
       ** replayed after a crash
       */
      if (flushall) {
            flush_older_journal_lists(s, jl);
      }

      err = journal->j_errno;
      /* before we can remove everything from the hash tables for this
       ** transaction, we must make sure it can never be replayed
       **
       ** since we are only called from do_journal_end, we know for sure there
       ** are no allocations going on while we are flushing journal lists.  So,
       ** we only need to update the journal header block for the last list
       ** being flushed
       */
      if (!err && flushall) {
            err =
                update_journal_header_block(s,
                                    (jl->j_start + jl->j_len +
                                     2) % SB_ONDISK_JOURNAL_SIZE(s),
                                    jl->j_trans_id);
            if (err)
                  reiserfs_abort(s, -EIO,
                               "Write error while updating journal header in %s",
                               __func__);
      }
      remove_all_from_journal_list(s, jl, 0);
      list_del_init(&jl->j_list);
      journal->j_num_lists--;
      del_from_work_list(s, jl);

      if (journal->j_last_flush_id != 0 &&
          (jl->j_trans_id - journal->j_last_flush_id) != 1) {
            reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
                         journal->j_last_flush_id, jl->j_trans_id);
      }
      journal->j_last_flush_id = jl->j_trans_id;

      /* not strictly required since we are freeing the list, but it should
       * help find code using dead lists later on
       */
      jl->j_len = 0;
      atomic_set(&(jl->j_nonzerolen), 0);
      jl->j_start = 0;
      jl->j_realblock = NULL;
      jl->j_commit_bh = NULL;
      jl->j_trans_id = 0;
      jl->j_state = 0;
      put_journal_list(s, jl);
      if (flushall)
            mutex_unlock(&journal->j_flush_mutex);
      put_fs_excl();
      return err;
}

static int test_transaction(struct super_block *s,
                            struct reiserfs_journal_list *jl)
{
      struct reiserfs_journal_cnode *cn;

      if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
            return 1;

      cn = jl->j_realblock;
      while (cn) {
            /* if the blocknr == 0, this has been cleared from the hash,
             ** skip it
             */
            if (cn->blocknr == 0) {
                  goto next;
            }
            if (cn->bh && !newer_jl_done(cn))
                  return 0;
            next:
            cn = cn->next;
            cond_resched();
      }
      return 0;
}

static int write_one_transaction(struct super_block *s,
                         struct reiserfs_journal_list *jl,
                         struct buffer_chunk *chunk)
{
      struct reiserfs_journal_cnode *cn;
      int ret = 0;

      jl->j_state |= LIST_TOUCHED;
      del_from_work_list(s, jl);
      if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
            return 0;
      }

      cn = jl->j_realblock;
      while (cn) {
            /* if the blocknr == 0, this has been cleared from the hash,
             ** skip it
             */
            if (cn->blocknr == 0) {
                  goto next;
            }
            if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
                  struct buffer_head *tmp_bh;
                  /* we can race against journal_mark_freed when we try
                   * to lock_buffer(cn->bh), so we have to inc the buffer
                   * count, and recheck things after locking
                   */
                  tmp_bh = cn->bh;
                  get_bh(tmp_bh);
                  lock_buffer(tmp_bh);
                  if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
                        if (!buffer_journal_dirty(tmp_bh) ||
                            buffer_journal_prepared(tmp_bh))
                              BUG();
                        add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
                        ret++;
                  } else {
                        /* note, cn->bh might be null now */
                        unlock_buffer(tmp_bh);
                  }
                  put_bh(tmp_bh);
            }
            next:
            cn = cn->next;
            cond_resched();
      }
      return ret;
}

/* used by flush_commit_list */
static int dirty_one_transaction(struct super_block *s,
                         struct reiserfs_journal_list *jl)
{
      struct reiserfs_journal_cnode *cn;
      struct reiserfs_journal_list *pjl;
      int ret = 0;

      jl->j_state |= LIST_DIRTY;
      cn = jl->j_realblock;
      while (cn) {
            /* look for a more recent transaction that logged this
             ** buffer.  Only the most recent transaction with a buffer in
             ** it is allowed to send that buffer to disk
             */
            pjl = find_newer_jl_for_cn(cn);
            if (!pjl && cn->blocknr && cn->bh
                && buffer_journal_dirty(cn->bh)) {
                  BUG_ON(!can_dirty(cn));
                  /* if the buffer is prepared, it will either be logged
                   * or restored.  If restored, we need to make sure
                   * it actually gets marked dirty
                   */
                  clear_buffer_journal_new(cn->bh);
                  if (buffer_journal_prepared(cn->bh)) {
                        set_buffer_journal_restore_dirty(cn->bh);
                  } else {
                        set_buffer_journal_test(cn->bh);
                        mark_buffer_dirty(cn->bh);
                  }
            }
            cn = cn->next;
      }
      return ret;
}

static int kupdate_transactions(struct super_block *s,
                        struct reiserfs_journal_list *jl,
                        struct reiserfs_journal_list **next_jl,
                        unsigned int *next_trans_id,
                        int num_blocks, int num_trans)
{
      int ret = 0;
      int written = 0;
      int transactions_flushed = 0;
      unsigned int orig_trans_id = jl->j_trans_id;
      struct buffer_chunk chunk;
      struct list_head *entry;
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      chunk.nr = 0;

      mutex_lock(&journal->j_flush_mutex);
      if (!journal_list_still_alive(s, orig_trans_id)) {
            goto done;
      }

      /* we've got j_flush_mutex held, nobody is going to delete any
       * of these lists out from underneath us
       */
      while ((num_trans && transactions_flushed < num_trans) ||
             (!num_trans && written < num_blocks)) {

            if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
                atomic_read(&jl->j_commit_left)
                || !(jl->j_state & LIST_DIRTY)) {
                  del_from_work_list(s, jl);
                  break;
            }
            ret = write_one_transaction(s, jl, &chunk);

            if (ret < 0)
                  goto done;
            transactions_flushed++;
            written += ret;
            entry = jl->j_list.next;

            /* did we wrap? */
            if (entry == &journal->j_journal_list) {
                  break;
            }
            jl = JOURNAL_LIST_ENTRY(entry);

            /* don't bother with older transactions */
            if (jl->j_trans_id <= orig_trans_id)
                  break;
      }
      if (chunk.nr) {
            write_chunk(&chunk);
      }

      done:
      mutex_unlock(&journal->j_flush_mutex);
      return ret;
}

/* for o_sync and fsync heavy applications, they tend to use
** all the journa list slots with tiny transactions.  These
** trigger lots and lots of calls to update the header block, which
** adds seeks and slows things down.
**
** This function tries to clear out a large chunk of the journal lists
** at once, which makes everything faster since only the newest journal
** list updates the header block
*/
static int flush_used_journal_lists(struct super_block *s,
                            struct reiserfs_journal_list *jl)
{
      unsigned long len = 0;
      unsigned long cur_len;
      int ret;
      int i;
      int limit = 256;
      struct reiserfs_journal_list *tjl;
      struct reiserfs_journal_list *flush_jl;
      unsigned int trans_id;
      struct reiserfs_journal *journal = SB_JOURNAL(s);

      flush_jl = tjl = jl;

      /* in data logging mode, try harder to flush a lot of blocks */
      if (reiserfs_data_log(s))
            limit = 1024;
      /* flush for 256 transactions or limit blocks, whichever comes first */
      for (i = 0; i < 256 && len < limit; i++) {
            if (atomic_read(&tjl->j_commit_left) ||
                tjl->j_trans_id < jl->j_trans_id) {
                  break;
            }
            cur_len = atomic_read(&tjl->j_nonzerolen);
            if (cur_len > 0) {
                  tjl->j_state &= ~LIST_TOUCHED;
            }
            len += cur_len;
            flush_jl = tjl;
            if (tjl->j_list.next == &journal->j_journal_list)
                  break;
            tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
      }
      /* try to find a group of blocks we can flush across all the
       ** transactions, but only bother if we've actually spanned
       ** across multiple lists
       */
      if (flush_jl != jl) {
            ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
      }
      flush_journal_list(s, flush_jl, 1);
      return 0;
}

/*
** removes any nodes in table with name block and dev as bh.
** only touchs the hnext and hprev pointers.
*/
void remove_journal_hash(struct super_block *sb,
                   struct reiserfs_journal_cnode **table,
                   struct reiserfs_journal_list *jl,
                   unsigned long block, int remove_freed)
{
      struct reiserfs_journal_cnode *cur;
      struct reiserfs_journal_cnode **head;

      head = &(journal_hash(table, sb, block));
      if (!head) {
            return;
      }
      cur = *head;
      while (cur) {
            if (cur->blocknr == block && cur->sb == sb
                && (jl == NULL || jl == cur->jlist)
                && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
                  if (cur->hnext) {
                        cur->hnext->hprev = cur->hprev;
                  }
                  if (cur->hprev) {
                        cur->hprev->hnext = cur->hnext;
                  } else {
                        *head = cur->hnext;
                  }
                  cur->blocknr = 0;
                  cur->sb = NULL;
                  cur->state = 0;
                  if (cur->bh && cur->jlist)    /* anybody who clears the cur->bh will also dec the nonzerolen */
                        atomic_dec(&(cur->jlist->j_nonzerolen));
                  cur->bh = NULL;
                  cur->jlist = NULL;
            }
            cur = cur->hnext;
      }
}

static void free_journal_ram(struct super_block *sb)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      kfree(journal->j_current_jl);
      journal->j_num_lists--;

      vfree(journal->j_cnode_free_orig);
      free_list_bitmaps(sb, journal->j_list_bitmap);
      free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
      if (journal->j_header_bh) {
            brelse(journal->j_header_bh);
      }
      /* j_header_bh is on the journal dev, make sure not to release the journal
       * dev until we brelse j_header_bh
       */
      release_journal_dev(sb, journal);
      vfree(journal);
}

/*
** call on unmount.  Only set error to 1 if you haven't made your way out
** of read_super() yet.  Any other caller must keep error at 0.
*/
static int do_journal_release(struct reiserfs_transaction_handle *th,
                        struct super_block *sb, int error)
{
      struct reiserfs_transaction_handle myth;
      int flushed = 0;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);

      /* we only want to flush out transactions if we were called with error == 0
       */
      if (!error && !(sb->s_flags & MS_RDONLY)) {
            /* end the current trans */
            BUG_ON(!th->t_trans_id);
            do_journal_end(th, sb, 10, FLUSH_ALL);

            /* make sure something gets logged to force our way into the flush code */
            if (!journal_join(&myth, sb, 1)) {
                  reiserfs_prepare_for_journal(sb,
                                         SB_BUFFER_WITH_SB(sb),
                                         1);
                  journal_mark_dirty(&myth, sb,
                                 SB_BUFFER_WITH_SB(sb));
                  do_journal_end(&myth, sb, 1, FLUSH_ALL);
                  flushed = 1;
            }
      }

      /* this also catches errors during the do_journal_end above */
      if (!error && reiserfs_is_journal_aborted(journal)) {
            memset(&myth, 0, sizeof(myth));
            if (!journal_join_abort(&myth, sb, 1)) {
                  reiserfs_prepare_for_journal(sb,
                                         SB_BUFFER_WITH_SB(sb),
                                         1);
                  journal_mark_dirty(&myth, sb,
                                 SB_BUFFER_WITH_SB(sb));
                  do_journal_end(&myth, sb, 1, FLUSH_ALL);
            }
      }

      reiserfs_mounted_fs_count--;
      /* wait for all commits to finish */
      cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
      flush_workqueue(commit_wq);
      if (!reiserfs_mounted_fs_count) {
            destroy_workqueue(commit_wq);
            commit_wq = NULL;
      }

      free_journal_ram(sb);

      return 0;
}

/*
** call on unmount.  flush all journal trans, release all alloc'd ram
*/
int journal_release(struct reiserfs_transaction_handle *th,
                struct super_block *sb)
{
      return do_journal_release(th, sb, 0);
}

/*
** only call from an error condition inside reiserfs_read_super!
*/
int journal_release_error(struct reiserfs_transaction_handle *th,
                    struct super_block *sb)
{
      return do_journal_release(th, sb, 1);
}

/* compares description block with commit block.  returns 1 if they differ, 0 if they are the same */
static int journal_compare_desc_commit(struct super_block *sb,
                               struct reiserfs_journal_desc *desc,
                               struct reiserfs_journal_commit *commit)
{
      if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
          get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
          get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
          get_commit_trans_len(commit) <= 0) {
            return 1;
      }
      return 0;
}

/* returns 0 if it did not find a description block
** returns -1 if it found a corrupt commit block
** returns 1 if both desc and commit were valid
*/
static int journal_transaction_is_valid(struct super_block *sb,
                              struct buffer_head *d_bh,
                              unsigned int *oldest_invalid_trans_id,
                              unsigned long *newest_mount_id)
{
      struct reiserfs_journal_desc *desc;
      struct reiserfs_journal_commit *commit;
      struct buffer_head *c_bh;
      unsigned long offset;

      if (!d_bh)
            return 0;

      desc = (struct reiserfs_journal_desc *)d_bh->b_data;
      if (get_desc_trans_len(desc) > 0
          && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
            if (oldest_invalid_trans_id && *oldest_invalid_trans_id
                && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
                  reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                               "journal-986: transaction "
                               "is valid returning because trans_id %d is greater than "
                               "oldest_invalid %lu",
                               get_desc_trans_id(desc),
                               *oldest_invalid_trans_id);
                  return 0;
            }
            if (newest_mount_id
                && *newest_mount_id > get_desc_mount_id(desc)) {
                  reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                               "journal-1087: transaction "
                               "is valid returning because mount_id %d is less than "
                               "newest_mount_id %lu",
                               get_desc_mount_id(desc),
                               *newest_mount_id);
                  return -1;
            }
            if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
                  reiserfs_warning(sb, "journal-2018",
                               "Bad transaction length %d "
                               "encountered, ignoring transaction",
                               get_desc_trans_len(desc));
                  return -1;
            }
            offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);

            /* ok, we have a journal description block, lets see if the transaction was valid */
            c_bh =
                journal_bread(sb,
                          SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                          ((offset + get_desc_trans_len(desc) +
                            1) % SB_ONDISK_JOURNAL_SIZE(sb)));
            if (!c_bh)
                  return 0;
            commit = (struct reiserfs_journal_commit *)c_bh->b_data;
            if (journal_compare_desc_commit(sb, desc, commit)) {
                  reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                               "journal_transaction_is_valid, commit offset %ld had bad "
                               "time %d or length %d",
                               c_bh->b_blocknr -
                               SB_ONDISK_JOURNAL_1st_BLOCK(sb),
                               get_commit_trans_id(commit),
                               get_commit_trans_len(commit));
                  brelse(c_bh);
                  if (oldest_invalid_trans_id) {
                        *oldest_invalid_trans_id =
                            get_desc_trans_id(desc);
                        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                                     "journal-1004: "
                                     "transaction_is_valid setting oldest invalid trans_id "
                                     "to %d",
                                     get_desc_trans_id(desc));
                  }
                  return -1;
            }
            brelse(c_bh);
            reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                         "journal-1006: found valid "
                         "transaction start offset %llu, len %d id %d",
                         d_bh->b_blocknr -
                         SB_ONDISK_JOURNAL_1st_BLOCK(sb),
                         get_desc_trans_len(desc),
                         get_desc_trans_id(desc));
            return 1;
      } else {
            return 0;
      }
}

static void brelse_array(struct buffer_head **heads, int num)
{
      int i;
      for (i = 0; i < num; i++) {
            brelse(heads[i]);
      }
}

/*
** given the start, and values for the oldest acceptable transactions,
** this either reads in a replays a transaction, or returns because the transaction
** is invalid, or too old.
*/
static int journal_read_transaction(struct super_block *sb,
                            unsigned long cur_dblock,
                            unsigned long oldest_start,
                            unsigned int oldest_trans_id,
                            unsigned long newest_mount_id)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_journal_desc *desc;
      struct reiserfs_journal_commit *commit;
      unsigned int trans_id = 0;
      struct buffer_head *c_bh;
      struct buffer_head *d_bh;
      struct buffer_head **log_blocks = NULL;
      struct buffer_head **real_blocks = NULL;
      unsigned int trans_offset;
      int i;
      int trans_half;

      d_bh = journal_bread(sb, cur_dblock);
      if (!d_bh)
            return 1;
      desc = (struct reiserfs_journal_desc *)d_bh->b_data;
      trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
      reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
                   "journal_read_transaction, offset %llu, len %d mount_id %d",
                   d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
                   get_desc_trans_len(desc), get_desc_mount_id(desc));
      if (get_desc_trans_id(desc) < oldest_trans_id) {
            reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
                         "journal_read_trans skipping because %lu is too old",
                         cur_dblock -
                         SB_ONDISK_JOURNAL_1st_BLOCK(sb));
            brelse(d_bh);
            return 1;
      }
      if (get_desc_mount_id(desc) != newest_mount_id) {
            reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
                         "journal_read_trans skipping because %d is != "
                         "newest_mount_id %lu", get_desc_mount_id(desc),
                         newest_mount_id);
            brelse(d_bh);
            return 1;
      }
      c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                       ((trans_offset + get_desc_trans_len(desc) + 1) %
                        SB_ONDISK_JOURNAL_SIZE(sb)));
      if (!c_bh) {
            brelse(d_bh);
            return 1;
      }
      commit = (struct reiserfs_journal_commit *)c_bh->b_data;
      if (journal_compare_desc_commit(sb, desc, commit)) {
            reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                         "journal_read_transaction, "
                         "commit offset %llu had bad time %d or length %d",
                         c_bh->b_blocknr -
                         SB_ONDISK_JOURNAL_1st_BLOCK(sb),
                         get_commit_trans_id(commit),
                         get_commit_trans_len(commit));
            brelse(c_bh);
            brelse(d_bh);
            return 1;
      }
      trans_id = get_desc_trans_id(desc);
      /* now we know we've got a good transaction, and it was inside the valid time ranges */
      log_blocks = kmalloc(get_desc_trans_len(desc) *
                       sizeof(struct buffer_head *), GFP_NOFS);
      real_blocks = kmalloc(get_desc_trans_len(desc) *
                        sizeof(struct buffer_head *), GFP_NOFS);
      if (!log_blocks || !real_blocks) {
            brelse(c_bh);
            brelse(d_bh);
            kfree(log_blocks);
            kfree(real_blocks);
            reiserfs_warning(sb, "journal-1169",
                         "kmalloc failed, unable to mount FS");
            return -1;
      }
      /* get all the buffer heads */
      trans_half = journal_trans_half(sb->s_blocksize);
      for (i = 0; i < get_desc_trans_len(desc); i++) {
            log_blocks[i] =
                journal_getblk(sb,
                           SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                           (trans_offset + 1 +
                            i) % SB_ONDISK_JOURNAL_SIZE(sb));
            if (i < trans_half) {
                  real_blocks[i] =
                      sb_getblk(sb,
                              le32_to_cpu(desc->j_realblock[i]));
            } else {
                  real_blocks[i] =
                      sb_getblk(sb,
                              le32_to_cpu(commit->
                                      j_realblock[i - trans_half]));
            }
            if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
                  reiserfs_warning(sb, "journal-1207",
                               "REPLAY FAILURE fsck required! "
                               "Block to replay is outside of "
                               "filesystem");
                  goto abort_replay;
            }
            /* make sure we don't try to replay onto log or reserved area */
            if (is_block_in_log_or_reserved_area
                (sb, real_blocks[i]->b_blocknr)) {
                  reiserfs_warning(sb, "journal-1204",
                               "REPLAY FAILURE fsck required! "
                               "Trying to replay onto a log block");
                  abort_replay:
                  brelse_array(log_blocks, i);
                  brelse_array(real_blocks, i);
                  brelse(c_bh);
                  brelse(d_bh);
                  kfree(log_blocks);
                  kfree(real_blocks);
                  return -1;
            }
      }
      /* read in the log blocks, memcpy to the corresponding real block */
      ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
      for (i = 0; i < get_desc_trans_len(desc); i++) {
            wait_on_buffer(log_blocks[i]);
            if (!buffer_uptodate(log_blocks[i])) {
                  reiserfs_warning(sb, "journal-1212",
                               "REPLAY FAILURE fsck required! "
                               "buffer write failed");
                  brelse_array(log_blocks + i,
                             get_desc_trans_len(desc) - i);
                  brelse_array(real_blocks, get_desc_trans_len(desc));
                  brelse(c_bh);
                  brelse(d_bh);
                  kfree(log_blocks);
                  kfree(real_blocks);
                  return -1;
            }
            memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
                   real_blocks[i]->b_size);
            set_buffer_uptodate(real_blocks[i]);
            brelse(log_blocks[i]);
      }
      /* flush out the real blocks */
      for (i = 0; i < get_desc_trans_len(desc); i++) {
            set_buffer_dirty(real_blocks[i]);
            ll_rw_block(SWRITE, 1, real_blocks + i);
      }
      for (i = 0; i < get_desc_trans_len(desc); i++) {
            wait_on_buffer(real_blocks[i]);
            if (!buffer_uptodate(real_blocks[i])) {
                  reiserfs_warning(sb, "journal-1226",
                               "REPLAY FAILURE, fsck required! "
                               "buffer write failed");
                  brelse_array(real_blocks + i,
                             get_desc_trans_len(desc) - i);
                  brelse(c_bh);
                  brelse(d_bh);
                  kfree(log_blocks);
                  kfree(real_blocks);
                  return -1;
            }
            brelse(real_blocks[i]);
      }
      cur_dblock =
          SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
          ((trans_offset + get_desc_trans_len(desc) +
            2) % SB_ONDISK_JOURNAL_SIZE(sb));
      reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                   "journal-1095: setting journal " "start to offset %ld",
                   cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));

      /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
      journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
      journal->j_last_flush_trans_id = trans_id;
      journal->j_trans_id = trans_id + 1;
      /* check for trans_id overflow */
      if (journal->j_trans_id == 0)
            journal->j_trans_id = 10;
      brelse(c_bh);
      brelse(d_bh);
      kfree(log_blocks);
      kfree(real_blocks);
      return 0;
}

/* This function reads blocks starting from block and to max_block of bufsize
   size (but no more than BUFNR blocks at a time). This proved to improve
   mounting speed on self-rebuilding raid5 arrays at least.
   Right now it is only used from journal code. But later we might use it
   from other places.
   Note: Do not use journal_getblk/sb_getblk functions here! */
static struct buffer_head *reiserfs_breada(struct block_device *dev,
                                 b_blocknr_t block, int bufsize,
                                 b_blocknr_t max_block)
{
      struct buffer_head *bhlist[BUFNR];
      unsigned int blocks = BUFNR;
      struct buffer_head *bh;
      int i, j;

      bh = __getblk(dev, block, bufsize);
      if (buffer_uptodate(bh))
            return (bh);

      if (block + BUFNR > max_block) {
            blocks = max_block - block;
      }
      bhlist[0] = bh;
      j = 1;
      for (i = 1; i < blocks; i++) {
            bh = __getblk(dev, block + i, bufsize);
            if (buffer_uptodate(bh)) {
                  brelse(bh);
                  break;
            } else
                  bhlist[j++] = bh;
      }
      ll_rw_block(READ, j, bhlist);
      for (i = 1; i < j; i++)
            brelse(bhlist[i]);
      bh = bhlist[0];
      wait_on_buffer(bh);
      if (buffer_uptodate(bh))
            return bh;
      brelse(bh);
      return NULL;
}

/*
** read and replay the log
** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
** transaction.  This tests that before finding all the transactions in the log, which makes normal mount times fast.
**
** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
**
** On exit, it sets things up so the first transaction will work correctly.
*/
static int journal_read(struct super_block *sb)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_journal_desc *desc;
      unsigned int oldest_trans_id = 0;
      unsigned int oldest_invalid_trans_id = 0;
      time_t start;
      unsigned long oldest_start = 0;
      unsigned long cur_dblock = 0;
      unsigned long newest_mount_id = 9;
      struct buffer_head *d_bh;
      struct reiserfs_journal_header *jh;
      int valid_journal_header = 0;
      int replay_count = 0;
      int continue_replay = 1;
      int ret;
      char b[BDEVNAME_SIZE];

      cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
      reiserfs_info(sb, "checking transaction log (%s)\n",
                  bdevname(journal->j_dev_bd, b));
      start = get_seconds();

      /* step 1, read in the journal header block.  Check the transaction it says
       ** is the first unflushed, and if that transaction is not valid,
       ** replay is done
       */
      journal->j_header_bh = journal_bread(sb,
                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb)
                                   + SB_ONDISK_JOURNAL_SIZE(sb));
      if (!journal->j_header_bh) {
            return 1;
      }
      jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
      if (le32_to_cpu(jh->j_first_unflushed_offset) <
          SB_ONDISK_JOURNAL_SIZE(sb)
          && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
            oldest_start =
                SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                le32_to_cpu(jh->j_first_unflushed_offset);
            oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
            newest_mount_id = le32_to_cpu(jh->j_mount_id);
            reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                         "journal-1153: found in "
                         "header: first_unflushed_offset %d, last_flushed_trans_id "
                         "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
                         le32_to_cpu(jh->j_last_flush_trans_id));
            valid_journal_header = 1;

            /* now, we try to read the first unflushed offset.  If it is not valid,
             ** there is nothing more we can do, and it makes no sense to read
             ** through the whole log.
             */
            d_bh =
                journal_bread(sb,
                          SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                          le32_to_cpu(jh->j_first_unflushed_offset));
            ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
            if (!ret) {
                  continue_replay = 0;
            }
            brelse(d_bh);
            goto start_log_replay;
      }

      if (continue_replay && bdev_read_only(sb->s_bdev)) {
            reiserfs_warning(sb, "clm-2076",
                         "device is readonly, unable to replay log");
            return -1;
      }

      /* ok, there are transactions that need to be replayed.  start with the first log block, find
       ** all the valid transactions, and pick out the oldest.
       */
      while (continue_replay
             && cur_dblock <
             (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
            SB_ONDISK_JOURNAL_SIZE(sb))) {
            /* Note that it is required for blocksize of primary fs device and journal
               device to be the same */
            d_bh =
                reiserfs_breada(journal->j_dev_bd, cur_dblock,
                            sb->s_blocksize,
                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                            SB_ONDISK_JOURNAL_SIZE(sb));
            ret =
                journal_transaction_is_valid(sb, d_bh,
                                     &oldest_invalid_trans_id,
                                     &newest_mount_id);
            if (ret == 1) {
                  desc = (struct reiserfs_journal_desc *)d_bh->b_data;
                  if (oldest_start == 0) {      /* init all oldest_ values */
                        oldest_trans_id = get_desc_trans_id(desc);
                        oldest_start = d_bh->b_blocknr;
                        newest_mount_id = get_desc_mount_id(desc);
                        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                                     "journal-1179: Setting "
                                     "oldest_start to offset %llu, trans_id %lu",
                                     oldest_start -
                                     SB_ONDISK_JOURNAL_1st_BLOCK
                                     (sb), oldest_trans_id);
                  } else if (oldest_trans_id > get_desc_trans_id(desc)) {
                        /* one we just read was older */
                        oldest_trans_id = get_desc_trans_id(desc);
                        oldest_start = d_bh->b_blocknr;
                        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                                     "journal-1180: Resetting "
                                     "oldest_start to offset %lu, trans_id %lu",
                                     oldest_start -
                                     SB_ONDISK_JOURNAL_1st_BLOCK
                                     (sb), oldest_trans_id);
                  }
                  if (newest_mount_id < get_desc_mount_id(desc)) {
                        newest_mount_id = get_desc_mount_id(desc);
                        reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                                     "journal-1299: Setting "
                                     "newest_mount_id to %d",
                                     get_desc_mount_id(desc));
                  }
                  cur_dblock += get_desc_trans_len(desc) + 2;
            } else {
                  cur_dblock++;
            }
            brelse(d_bh);
      }

      start_log_replay:
      cur_dblock = oldest_start;
      if (oldest_trans_id) {
            reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                         "journal-1206: Starting replay "
                         "from offset %llu, trans_id %lu",
                         cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
                         oldest_trans_id);

      }
      replay_count = 0;
      while (continue_replay && oldest_trans_id > 0) {
            ret =
                journal_read_transaction(sb, cur_dblock, oldest_start,
                                   oldest_trans_id, newest_mount_id);
            if (ret < 0) {
                  return ret;
            } else if (ret != 0) {
                  break;
            }
            cur_dblock =
                SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
            replay_count++;
            if (cur_dblock == oldest_start)
                  break;
      }

      if (oldest_trans_id == 0) {
            reiserfs_debug(sb, REISERFS_DEBUG_CODE,
                         "journal-1225: No valid " "transactions found");
      }
      /* j_start does not get set correctly if we don't replay any transactions.
       ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
       ** copy the trans_id from the header
       */
      if (valid_journal_header && replay_count == 0) {
            journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
            journal->j_trans_id =
                le32_to_cpu(jh->j_last_flush_trans_id) + 1;
            /* check for trans_id overflow */
            if (journal->j_trans_id == 0)
                  journal->j_trans_id = 10;
            journal->j_last_flush_trans_id =
                le32_to_cpu(jh->j_last_flush_trans_id);
            journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
      } else {
            journal->j_mount_id = newest_mount_id + 1;
      }
      reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
                   "newest_mount_id to %lu", journal->j_mount_id);
      journal->j_first_unflushed_offset = journal->j_start;
      if (replay_count > 0) {
            reiserfs_info(sb,
                        "replayed %d transactions in %lu seconds\n",
                        replay_count, get_seconds() - start);
      }
      if (!bdev_read_only(sb->s_bdev) &&
          _update_journal_header_block(sb, journal->j_start,
                               journal->j_last_flush_trans_id)) {
            /* replay failed, caller must call free_journal_ram and abort
             ** the mount
             */
            return -1;
      }
      return 0;
}

static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
{
      struct reiserfs_journal_list *jl;
      jl = kzalloc(sizeof(struct reiserfs_journal_list),
                 GFP_NOFS | __GFP_NOFAIL);
      INIT_LIST_HEAD(&jl->j_list);
      INIT_LIST_HEAD(&jl->j_working_list);
      INIT_LIST_HEAD(&jl->j_tail_bh_list);
      INIT_LIST_HEAD(&jl->j_bh_list);
      mutex_init(&jl->j_commit_mutex);
      SB_JOURNAL(s)->j_num_lists++;
      get_journal_list(jl);
      return jl;
}

static void journal_list_init(struct super_block *sb)
{
      SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
}

static int release_journal_dev(struct super_block *super,
                         struct reiserfs_journal *journal)
{
      int result;

      result = 0;

      if (journal->j_dev_bd != NULL) {
            if (journal->j_dev_bd->bd_dev != super->s_dev)
                  bd_release(journal->j_dev_bd);
            result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
            journal->j_dev_bd = NULL;
      }

      if (result != 0) {
            reiserfs_warning(super, "sh-457",
                         "Cannot release journal device: %i", result);
      }
      return result;
}

static int journal_init_dev(struct super_block *super,
                      struct reiserfs_journal *journal,
                      const char *jdev_name)
{
      int result;
      dev_t jdev;
      fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE;
      char b[BDEVNAME_SIZE];

      result = 0;

      journal->j_dev_bd = NULL;
      jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
          new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;

      if (bdev_read_only(super->s_bdev))
            blkdev_mode = FMODE_READ;

      /* there is no "jdev" option and journal is on separate device */
      if ((!jdev_name || !jdev_name[0])) {
            journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
            journal->j_dev_mode = blkdev_mode;
            if (IS_ERR(journal->j_dev_bd)) {
                  result = PTR_ERR(journal->j_dev_bd);
                  journal->j_dev_bd = NULL;
                  reiserfs_warning(super, "sh-458",
                               "cannot init journal device '%s': %i",
                               __bdevname(jdev, b), result);
                  return result;
            } else if (jdev != super->s_dev) {
                  result = bd_claim(journal->j_dev_bd, journal);
                  if (result) {
                        blkdev_put(journal->j_dev_bd, blkdev_mode);
                        return result;
                  }

                  set_blocksize(journal->j_dev_bd, super->s_blocksize);
            }

            return 0;
      }

      journal->j_dev_mode = blkdev_mode;
      journal->j_dev_bd = open_bdev_exclusive(jdev_name,
                                    blkdev_mode, journal);
      if (IS_ERR(journal->j_dev_bd)) {
            result = PTR_ERR(journal->j_dev_bd);
            journal->j_dev_bd = NULL;
            reiserfs_warning(super,
                         "journal_init_dev: Cannot open '%s': %i",
                         jdev_name, result);
            return result;
      }

      set_blocksize(journal->j_dev_bd, super->s_blocksize);
      reiserfs_info(super,
                  "journal_init_dev: journal device: %s\n",
                  bdevname(journal->j_dev_bd, b));
      return 0;
}

/**
 * When creating/tuning a file system user can assign some
 * journal params within boundaries which depend on the ratio
 * blocksize/standard_blocksize.
 *
 * For blocks >= standard_blocksize transaction size should
 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
 * then JOURNAL_TRANS_MAX_DEFAULT.
 *
 * For blocks < standard_blocksize these boundaries should be
 * decreased proportionally.
 */
#define REISERFS_STANDARD_BLKSIZE (4096)

static int check_advise_trans_params(struct super_block *sb,
                             struct reiserfs_journal *journal)
{
        if (journal->j_trans_max) {
              /* Non-default journal params.
               Do sanity check for them. */
              int ratio = 1;
            if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
                    ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;

            if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
                journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
                SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
                JOURNAL_MIN_RATIO) {
                  reiserfs_warning(sb, "sh-462",
                               "bad transaction max size (%u). "
                               "FSCK?", journal->j_trans_max);
                  return 1;
            }
            if (journal->j_max_batch != (journal->j_trans_max) *
                    JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
                  reiserfs_warning(sb, "sh-463",
                               "bad transaction max batch (%u). "
                               "FSCK?", journal->j_max_batch);
                  return 1;
            }
      } else {
            /* Default journal params.
                   The file system was created by old version
               of mkreiserfs, so some fields contain zeros,
               and we need to advise proper values for them */
            if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
                  reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
                               sb->s_blocksize);
                  return 1;
            }
            journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
            journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
            journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
      }
      return 0;
}

/*
** must be called once on fs mount.  calls journal_read for you
*/
int journal_init(struct super_block *sb, const char *j_dev_name,
             int old_format, unsigned int commit_max_age)
{
      int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
      struct buffer_head *bhjh;
      struct reiserfs_super_block *rs;
      struct reiserfs_journal_header *jh;
      struct reiserfs_journal *journal;
      struct reiserfs_journal_list *jl;
      char b[BDEVNAME_SIZE];

      journal = SB_JOURNAL(sb) = vmalloc(sizeof(struct reiserfs_journal));
      if (!journal) {
            reiserfs_warning(sb, "journal-1256",
                         "unable to get memory for journal structure");
            return 1;
      }
      memset(journal, 0, sizeof(struct reiserfs_journal));
      INIT_LIST_HEAD(&journal->j_bitmap_nodes);
      INIT_LIST_HEAD(&journal->j_prealloc_list);
      INIT_LIST_HEAD(&journal->j_working_list);
      INIT_LIST_HEAD(&journal->j_journal_list);
      journal->j_persistent_trans = 0;
      if (reiserfs_allocate_list_bitmaps(sb,
                                 journal->j_list_bitmap,
                                 reiserfs_bmap_count(sb)))
            goto free_and_return;
      allocate_bitmap_nodes(sb);

      /* reserved for journal area support */
      SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
                                     REISERFS_OLD_DISK_OFFSET_IN_BYTES
                                     / sb->s_blocksize +
                                     reiserfs_bmap_count(sb) +
                                     1 :
                                     REISERFS_DISK_OFFSET_IN_BYTES /
                                     sb->s_blocksize + 2);

      /* Sanity check to see is the standard journal fitting withing first bitmap
         (actual for small blocksizes) */
      if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
          (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
           SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
            reiserfs_warning(sb, "journal-1393",
                         "journal does not fit for area addressed "
                         "by first of bitmap blocks. It starts at "
                         "%u and its size is %u. Block size %ld",
                         SB_JOURNAL_1st_RESERVED_BLOCK(sb),
                         SB_ONDISK_JOURNAL_SIZE(sb),
                         sb->s_blocksize);
            goto free_and_return;
      }

      if (journal_init_dev(sb, journal, j_dev_name) != 0) {
            reiserfs_warning(sb, "sh-462",
                         "unable to initialize jornal device");
            goto free_and_return;
      }

      rs = SB_DISK_SUPER_BLOCK(sb);

      /* read journal header */
      bhjh = journal_bread(sb,
                       SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                       SB_ONDISK_JOURNAL_SIZE(sb));
      if (!bhjh) {
            reiserfs_warning(sb, "sh-459",
                         "unable to read journal header");
            goto free_and_return;
      }
      jh = (struct reiserfs_journal_header *)(bhjh->b_data);

      /* make sure that journal matches to the super block */
      if (is_reiserfs_jr(rs)
          && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
            sb_jp_journal_magic(rs))) {
            reiserfs_warning(sb, "sh-460",
                         "journal header magic %x (device %s) does "
                         "not match to magic found in super block %x",
                         jh->jh_journal.jp_journal_magic,
                         bdevname(journal->j_dev_bd, b),
                         sb_jp_journal_magic(rs));
            brelse(bhjh);
            goto free_and_return;
      }

      journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
      journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
      journal->j_max_commit_age =
          le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
      journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;

      if (check_advise_trans_params(sb, journal) != 0)
              goto free_and_return;
      journal->j_default_max_commit_age = journal->j_max_commit_age;

      if (commit_max_age != 0) {
            journal->j_max_commit_age = commit_max_age;
            journal->j_max_trans_age = commit_max_age;
      }

      reiserfs_info(sb, "journal params: device %s, size %u, "
                  "journal first block %u, max trans len %u, max batch %u, "
                  "max commit age %u, max trans age %u\n",
                  bdevname(journal->j_dev_bd, b),
                  SB_ONDISK_JOURNAL_SIZE(sb),
                  SB_ONDISK_JOURNAL_1st_BLOCK(sb),
                  journal->j_trans_max,
                  journal->j_max_batch,
                  journal->j_max_commit_age, journal->j_max_trans_age);

      brelse(bhjh);

      journal->j_list_bitmap_index = 0;
      journal_list_init(sb);

      memset(journal->j_list_hash_table, 0,
             JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));

      INIT_LIST_HEAD(&journal->j_dirty_buffers);
      spin_lock_init(&journal->j_dirty_buffers_lock);

      journal->j_start = 0;
      journal->j_len = 0;
      journal->j_len_alloc = 0;
      atomic_set(&(journal->j_wcount), 0);
      atomic_set(&(journal->j_async_throttle), 0);
      journal->j_bcount = 0;
      journal->j_trans_start_time = 0;
      journal->j_last = NULL;
      journal->j_first = NULL;
      init_waitqueue_head(&(journal->j_join_wait));
      mutex_init(&journal->j_mutex);
      mutex_init(&journal->j_flush_mutex);

      journal->j_trans_id = 10;
      journal->j_mount_id = 10;
      journal->j_state = 0;
      atomic_set(&(journal->j_jlock), 0);
      journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
      journal->j_cnode_free_orig = journal->j_cnode_free_list;
      journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
      journal->j_cnode_used = 0;
      journal->j_must_wait = 0;

      if (journal->j_cnode_free == 0) {
            reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
                             "allocation failed (%ld bytes). Journal is "
                             "too large for available memory. Usually "
                             "this is due to a journal that is too large.",
                             sizeof (struct reiserfs_journal_cnode) * num_cnodes);
            goto free_and_return;
      }

      init_journal_hash(sb);
      jl = journal->j_current_jl;
      jl->j_list_bitmap = get_list_bitmap(sb, jl);
      if (!jl->j_list_bitmap) {
            reiserfs_warning(sb, "journal-2005",
                         "get_list_bitmap failed for journal list 0");
            goto free_and_return;
      }
      if (journal_read(sb) < 0) {
            reiserfs_warning(sb, "reiserfs-2006",
                         "Replay Failure, unable to mount");
            goto free_and_return;
      }

      reiserfs_mounted_fs_count++;
      if (reiserfs_mounted_fs_count <= 1)
            commit_wq = create_workqueue("reiserfs");

      INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
      journal->j_work_sb = sb;
      return 0;
      free_and_return:
      free_journal_ram(sb);
      return 1;
}

/*
** test for a polite end of the current transaction.  Used by file_write, and should
** be used by delete to make sure they don't write more than can fit inside a single
** transaction
*/
int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
                           int new_alloc)
{
      struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
      time_t now = get_seconds();
      /* cannot restart while nested */
      BUG_ON(!th->t_trans_id);
      if (th->t_refcount > 1)
            return 0;
      if (journal->j_must_wait > 0 ||
          (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
          atomic_read(&(journal->j_jlock)) ||
          (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
          journal->j_cnode_free < (journal->j_trans_max * 3)) {
            return 1;
      }
      /* protected by the BKL here */
      journal->j_len_alloc += new_alloc;
      th->t_blocks_allocated += new_alloc ;
      return 0;
}

/* this must be called inside a transaction, and requires the
** kernel_lock to be held
*/
void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
{
      struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
      BUG_ON(!th->t_trans_id);
      journal->j_must_wait = 1;
      set_bit(J_WRITERS_BLOCKED, &journal->j_state);
      return;
}

/* this must be called without a transaction started, and does not
** require BKL
*/
void reiserfs_allow_writes(struct super_block *s)
{
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
      wake_up(&journal->j_join_wait);
}

/* this must be called without a transaction started, and does not
** require BKL
*/
void reiserfs_wait_on_write_block(struct super_block *s)
{
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      wait_event(journal->j_join_wait,
               !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
}

static void queue_log_writer(struct super_block *s)
{
      wait_queue_t wait;
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      set_bit(J_WRITERS_QUEUED, &journal->j_state);

      /*
       * we don't want to use wait_event here because
       * we only want to wait once.
       */
      init_waitqueue_entry(&wait, current);
      add_wait_queue(&journal->j_join_wait, &wait);
      set_current_state(TASK_UNINTERRUPTIBLE);
      if (test_bit(J_WRITERS_QUEUED, &journal->j_state))
            schedule();
      __set_current_state(TASK_RUNNING);
      remove_wait_queue(&journal->j_join_wait, &wait);
}

static void wake_queued_writers(struct super_block *s)
{
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
            wake_up(&journal->j_join_wait);
}

static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      unsigned long bcount = journal->j_bcount;
      while (1) {
            schedule_timeout_uninterruptible(1);
            journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
            while ((atomic_read(&journal->j_wcount) > 0 ||
                  atomic_read(&journal->j_jlock)) &&
                   journal->j_trans_id == trans_id) {
                  queue_log_writer(sb);
            }
            if (journal->j_trans_id != trans_id)
                  break;
            if (bcount == journal->j_bcount)
                  break;
            bcount = journal->j_bcount;
      }
}

/* join == true if you must join an existing transaction.
** join == false if you can deal with waiting for others to finish
**
** this will block until the transaction is joinable.  send the number of blocks you
** expect to use in nblocks.
*/
static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
                        struct super_block *sb, unsigned long nblocks,
                        int join)
{
      time_t now = get_seconds();
      unsigned int old_trans_id;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_transaction_handle myth;
      int sched_count = 0;
      int retval;

      reiserfs_check_lock_depth(sb, "journal_begin");
      BUG_ON(nblocks > journal->j_trans_max);

      PROC_INFO_INC(sb, journal.journal_being);
      /* set here for journal_join */
      th->t_refcount = 1;
      th->t_super = sb;

      relock:
      lock_journal(sb);
      if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
            unlock_journal(sb);
            retval = journal->j_errno;
            goto out_fail;
      }
      journal->j_bcount++;

      if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
            unlock_journal(sb);
            reiserfs_wait_on_write_block(sb);
            PROC_INFO_INC(sb, journal.journal_relock_writers);
            goto relock;
      }
      now = get_seconds();

      /* if there is no room in the journal OR
       ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
       ** we don't sleep if there aren't other writers
       */

      if ((!join && journal->j_must_wait > 0) ||
          (!join
           && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
          || (!join && atomic_read(&journal->j_wcount) > 0
            && journal->j_trans_start_time > 0
            && (now - journal->j_trans_start_time) >
            journal->j_max_trans_age) || (!join
                                    && atomic_read(&journal->j_jlock))
          || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {

            old_trans_id = journal->j_trans_id;
            unlock_journal(sb);     /* allow others to finish this transaction */

            if (!join && (journal->j_len_alloc + nblocks + 2) >=
                journal->j_max_batch &&
                ((journal->j_len + nblocks + 2) * 100) <
                (journal->j_len_alloc * 75)) {
                  if (atomic_read(&journal->j_wcount) > 10) {
                        sched_count++;
                        queue_log_writer(sb);
                        goto relock;
                  }
            }
            /* don't mess with joining the transaction if all we have to do is
             * wait for someone else to do a commit
             */
            if (atomic_read(&journal->j_jlock)) {
                  while (journal->j_trans_id == old_trans_id &&
                         atomic_read(&journal->j_jlock)) {
                        queue_log_writer(sb);
                  }
                  goto relock;
            }
            retval = journal_join(&myth, sb, 1);
            if (retval)
                  goto out_fail;

            /* someone might have ended the transaction while we joined */
            if (old_trans_id != journal->j_trans_id) {
                  retval = do_journal_end(&myth, sb, 1, 0);
            } else {
                  retval = do_journal_end(&myth, sb, 1, COMMIT_NOW);
            }

            if (retval)
                  goto out_fail;

            PROC_INFO_INC(sb, journal.journal_relock_wcount);
            goto relock;
      }
      /* we are the first writer, set trans_id */
      if (journal->j_trans_start_time == 0) {
            journal->j_trans_start_time = get_seconds();
      }
      atomic_inc(&(journal->j_wcount));
      journal->j_len_alloc += nblocks;
      th->t_blocks_logged = 0;
      th->t_blocks_allocated = nblocks;
      th->t_trans_id = journal->j_trans_id;
      unlock_journal(sb);
      INIT_LIST_HEAD(&th->t_list);
      get_fs_excl();
      return 0;

      out_fail:
      memset(th, 0, sizeof(*th));
      /* Re-set th->t_super, so we can properly keep track of how many
       * persistent transactions there are. We need to do this so if this
       * call is part of a failed restart_transaction, we can free it later */
      th->t_super = sb;
      return retval;
}

struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
                                                    super_block
                                                    *s,
                                                    int nblocks)
{
      int ret;
      struct reiserfs_transaction_handle *th;

      /* if we're nesting into an existing transaction.  It will be
       ** persistent on its own
       */
      if (reiserfs_transaction_running(s)) {
            th = current->journal_info;
            th->t_refcount++;
            BUG_ON(th->t_refcount < 2);
            
            return th;
      }
      th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
      if (!th)
            return NULL;
      ret = journal_begin(th, s, nblocks);
      if (ret) {
            kfree(th);
            return NULL;
      }

      SB_JOURNAL(s)->j_persistent_trans++;
      return th;
}

int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
{
      struct super_block *s = th->t_super;
      int ret = 0;
      if (th->t_trans_id)
            ret = journal_end(th, th->t_super, th->t_blocks_allocated);
      else
            ret = -EIO;
      if (th->t_refcount == 0) {
            SB_JOURNAL(s)->j_persistent_trans--;
            kfree(th);
      }
      return ret;
}

static int journal_join(struct reiserfs_transaction_handle *th,
                  struct super_block *sb, unsigned long nblocks)
{
      struct reiserfs_transaction_handle *cur_th = current->journal_info;

      /* this keeps do_journal_end from NULLing out the current->journal_info
       ** pointer
       */
      th->t_handle_save = cur_th;
      BUG_ON(cur_th && cur_th->t_refcount > 1);
      return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN);
}

int journal_join_abort(struct reiserfs_transaction_handle *th,
                   struct super_block *sb, unsigned long nblocks)
{
      struct reiserfs_transaction_handle *cur_th = current->journal_info;

      /* this keeps do_journal_end from NULLing out the current->journal_info
       ** pointer
       */
      th->t_handle_save = cur_th;
      BUG_ON(cur_th && cur_th->t_refcount > 1);
      return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT);
}

int journal_begin(struct reiserfs_transaction_handle *th,
              struct super_block *sb, unsigned long nblocks)
{
      struct reiserfs_transaction_handle *cur_th = current->journal_info;
      int ret;

      th->t_handle_save = NULL;
      if (cur_th) {
            /* we are nesting into the current transaction */
            if (cur_th->t_super == sb) {
                  BUG_ON(!cur_th->t_refcount);
                  cur_th->t_refcount++;
                  memcpy(th, cur_th, sizeof(*th));
                  if (th->t_refcount <= 1)
                        reiserfs_warning(sb, "reiserfs-2005",
                                     "BAD: refcount <= 1, but "
                                     "journal_info != 0");
                  return 0;
            } else {
                  /* we've ended up with a handle from a different filesystem.
                   ** save it and restore on journal_end.  This should never
                   ** really happen...
                   */
                  reiserfs_warning(sb, "clm-2100",
                               "nesting info a different FS");
                  th->t_handle_save = current->journal_info;
                  current->journal_info = th;
            }
      } else {
            current->journal_info = th;
      }
      ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
      BUG_ON(current->journal_info != th);

      /* I guess this boils down to being the reciprocal of clm-2100 above.
       * If do_journal_begin_r fails, we need to put it back, since journal_end
       * won't be called to do it. */
      if (ret)
            current->journal_info = th->t_handle_save;
      else
            BUG_ON(!th->t_refcount);

      return ret;
}

/*
** puts bh into the current transaction.  If it was already there, reorders removes the
** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
**
** if it was dirty, cleans and files onto the clean list.  I can't let it be dirty again until the
** transaction is committed.
**
** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
*/
int journal_mark_dirty(struct reiserfs_transaction_handle *th,
                   struct super_block *sb, struct buffer_head *bh)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_journal_cnode *cn = NULL;
      int count_already_incd = 0;
      int prepared = 0;
      BUG_ON(!th->t_trans_id);

      PROC_INFO_INC(sb, journal.mark_dirty);
      if (th->t_trans_id != journal->j_trans_id) {
            reiserfs_panic(th->t_super, "journal-1577",
                         "handle trans id %ld != current trans id %ld",
                         th->t_trans_id, journal->j_trans_id);
      }

      sb->s_dirt = 1;

      prepared = test_clear_buffer_journal_prepared(bh);
      clear_buffer_journal_restore_dirty(bh);
      /* already in this transaction, we are done */
      if (buffer_journaled(bh)) {
            PROC_INFO_INC(sb, journal.mark_dirty_already);
            return 0;
      }

      /* this must be turned into a panic instead of a warning.  We can't allow
       ** a dirty or journal_dirty or locked buffer to be logged, as some changes
       ** could get to disk too early.  NOT GOOD.
       */
      if (!prepared || buffer_dirty(bh)) {
            reiserfs_warning(sb, "journal-1777",
                         "buffer %llu bad state "
                         "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
                         (unsigned long long)bh->b_blocknr,
                         prepared ? ' ' : '!',
                         buffer_locked(bh) ? ' ' : '!',
                         buffer_dirty(bh) ? ' ' : '!',
                         buffer_journal_dirty(bh) ? ' ' : '!');
      }

      if (atomic_read(&(journal->j_wcount)) <= 0) {
            reiserfs_warning(sb, "journal-1409",
                         "returning because j_wcount was %d",
                         atomic_read(&(journal->j_wcount)));
            return 1;
      }
      /* this error means I've screwed up, and we've overflowed the transaction.
       ** Nothing can be done here, except make the FS readonly or panic.
       */
      if (journal->j_len >= journal->j_trans_max) {
            reiserfs_panic(th->t_super, "journal-1413",
                         "j_len (%lu) is too big",
                         journal->j_len);
      }

      if (buffer_journal_dirty(bh)) {
            count_already_incd = 1;
            PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
            clear_buffer_journal_dirty(bh);
      }

      if (journal->j_len > journal->j_len_alloc) {
            journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
      }

      set_buffer_journaled(bh);

      /* now put this guy on the end */
      if (!cn) {
            cn = get_cnode(sb);
            if (!cn) {
                  reiserfs_panic(sb, "journal-4", "get_cnode failed!");
            }

            if (th->t_blocks_logged == th->t_blocks_allocated) {
                  th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
                  journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
            }
            th->t_blocks_logged++;
            journal->j_len++;

            cn->bh = bh;
            cn->blocknr = bh->b_blocknr;
            cn->sb = sb;
            cn->jlist = NULL;
            insert_journal_hash(journal->j_hash_table, cn);
            if (!count_already_incd) {
                  get_bh(bh);
            }
      }
      cn->next = NULL;
      cn->prev = journal->j_last;
      cn->bh = bh;
      if (journal->j_last) {
            journal->j_last->next = cn;
            journal->j_last = cn;
      } else {
            journal->j_first = cn;
            journal->j_last = cn;
      }
      return 0;
}

int journal_end(struct reiserfs_transaction_handle *th,
            struct super_block *sb, unsigned long nblocks)
{
      if (!current->journal_info && th->t_refcount > 1)
            reiserfs_warning(sb, "REISER-NESTING",
                         "th NULL, refcount %d", th->t_refcount);

      if (!th->t_trans_id) {
            WARN_ON(1);
            return -EIO;
      }

      th->t_refcount--;
      if (th->t_refcount > 0) {
            struct reiserfs_transaction_handle *cur_th =
                current->journal_info;

            /* we aren't allowed to close a nested transaction on a different
             ** filesystem from the one in the task struct
             */
            BUG_ON(cur_th->t_super != th->t_super);

            if (th != cur_th) {
                  memcpy(current->journal_info, th, sizeof(*th));
                  th->t_trans_id = 0;
            }
            return 0;
      } else {
            return do_journal_end(th, sb, nblocks, 0);
      }
}

/* removes from the current transaction, relsing and descrementing any counters.
** also files the removed buffer directly onto the clean list
**
** called by journal_mark_freed when a block has been deleted
**
** returns 1 if it cleaned and relsed the buffer. 0 otherwise
*/
static int remove_from_transaction(struct super_block *sb,
                           b_blocknr_t blocknr, int already_cleaned)
{
      struct buffer_head *bh;
      struct reiserfs_journal_cnode *cn;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      int ret = 0;

      cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
      if (!cn || !cn->bh) {
            return ret;
      }
      bh = cn->bh;
      if (cn->prev) {
            cn->prev->next = cn->next;
      }
      if (cn->next) {
            cn->next->prev = cn->prev;
      }
      if (cn == journal->j_first) {
            journal->j_first = cn->next;
      }
      if (cn == journal->j_last) {
            journal->j_last = cn->prev;
      }
      if (bh)
            remove_journal_hash(sb, journal->j_hash_table, NULL,
                            bh->b_blocknr, 0);
      clear_buffer_journaled(bh);   /* don't log this one */

      if (!already_cleaned) {
            clear_buffer_journal_dirty(bh);
            clear_buffer_dirty(bh);
            clear_buffer_journal_test(bh);
            put_bh(bh);
            if (atomic_read(&(bh->b_count)) < 0) {
                  reiserfs_warning(sb, "journal-1752",
                               "b_count < 0");
            }
            ret = 1;
      }
      journal->j_len--;
      journal->j_len_alloc--;
      free_cnode(sb, cn);
      return ret;
}

/*
** for any cnode in a journal list, it can only be dirtied of all the
** transactions that include it are committed to disk.
** this checks through each transaction, and returns 1 if you are allowed to dirty,
** and 0 if you aren't
**
** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
** blocks for a given transaction on disk
**
*/
static int can_dirty(struct reiserfs_journal_cnode *cn)
{
      struct super_block *sb = cn->sb;
      b_blocknr_t blocknr = cn->blocknr;
      struct reiserfs_journal_cnode *cur = cn->hprev;
      int can_dirty = 1;

      /* first test hprev.  These are all newer than cn, so any node here
       ** with the same block number and dev means this node can't be sent
       ** to disk right now.
       */
      while (cur && can_dirty) {
            if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
                cur->blocknr == blocknr) {
                  can_dirty = 0;
            }
            cur = cur->hprev;
      }
      /* then test hnext.  These are all older than cn.  As long as they
       ** are committed to the log, it is safe to write cn to disk
       */
      cur = cn->hnext;
      while (cur && can_dirty) {
            if (cur->jlist && cur->jlist->j_len > 0 &&
                atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
                cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
                  can_dirty = 0;
            }
            cur = cur->hnext;
      }
      return can_dirty;
}

/* syncs the commit blocks, but does not force the real buffers to disk
** will wait until the current transaction is done/committed before returning
*/
int journal_end_sync(struct reiserfs_transaction_handle *th,
                 struct super_block *sb, unsigned long nblocks)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);

      BUG_ON(!th->t_trans_id);
      /* you can sync while nested, very, very bad */
      BUG_ON(th->t_refcount > 1);
      if (journal->j_len == 0) {
            reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
                                   1);
            journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
      }
      return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT);
}

/*
** writeback the pending async commits to disk
*/
static void flush_async_commits(struct work_struct *work)
{
      struct reiserfs_journal *journal =
            container_of(work, struct reiserfs_journal, j_work.work);
      struct super_block *sb = journal->j_work_sb;
      struct reiserfs_journal_list *jl;
      struct list_head *entry;

      lock_kernel();
      if (!list_empty(&journal->j_journal_list)) {
            /* last entry is the youngest, commit it and you get everything */
            entry = journal->j_journal_list.prev;
            jl = JOURNAL_LIST_ENTRY(entry);
            flush_commit_list(sb, jl, 1);
      }
      unlock_kernel();
}

/*
** flushes any old transactions to disk
** ends the current transaction if it is too old
*/
int reiserfs_flush_old_commits(struct super_block *sb)
{
      time_t now;
      struct reiserfs_transaction_handle th;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);

      now = get_seconds();
      /* safety check so we don't flush while we are replaying the log during
       * mount
       */
      if (list_empty(&journal->j_journal_list)) {
            return 0;
      }

      /* check the current transaction.  If there are no writers, and it is
       * too old, finish it, and force the commit blocks to disk
       */
      if (atomic_read(&journal->j_wcount) <= 0 &&
          journal->j_trans_start_time > 0 &&
          journal->j_len > 0 &&
          (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
            if (!journal_join(&th, sb, 1)) {
                  reiserfs_prepare_for_journal(sb,
                                         SB_BUFFER_WITH_SB(sb),
                                         1);
                  journal_mark_dirty(&th, sb,
                                 SB_BUFFER_WITH_SB(sb));

                  /* we're only being called from kreiserfsd, it makes no sense to do
                   ** an async commit so that kreiserfsd can do it later
                   */
                  do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
            }
      }
      return sb->s_dirt;
}

/*
** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
**
** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
** the writers are done.  By the time it wakes up, the transaction it was called has already ended, so it just
** flushes the commit list and returns 0.
**
** Won't batch when flush or commit_now is set.  Also won't batch when others are waiting on j_join_wait.
**
** Note, we can't allow the journal_end to proceed while there are still writers in the log.
*/
static int check_journal_end(struct reiserfs_transaction_handle *th,
                       struct super_block *sb, unsigned long nblocks,
                       int flags)
{

      time_t now;
      int flush = flags & FLUSH_ALL;
      int commit_now = flags & COMMIT_NOW;
      int wait_on_commit = flags & WAIT;
      struct reiserfs_journal_list *jl;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);

      BUG_ON(!th->t_trans_id);

      if (th->t_trans_id != journal->j_trans_id) {
            reiserfs_panic(th->t_super, "journal-1577",
                         "handle trans id %ld != current trans id %ld",
                         th->t_trans_id, journal->j_trans_id);
      }

      journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
      if (atomic_read(&(journal->j_wcount)) > 0) {    /* <= 0 is allowed.  unmounting might not call begin */
            atomic_dec(&(journal->j_wcount));
      }

      /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
       ** will be dealt with by next transaction that actually writes something, but should be taken
       ** care of in this trans
       */
      BUG_ON(journal->j_len == 0);

      /* if wcount > 0, and we are called to with flush or commit_now,
       ** we wait on j_join_wait.  We will wake up when the last writer has
       ** finished the transaction, and started it on its way to the disk.
       ** Then, we flush the commit or journal list, and just return 0
       ** because the rest of journal end was already done for this transaction.
       */
      if (atomic_read(&(journal->j_wcount)) > 0) {
            if (flush || commit_now) {
                  unsigned trans_id;

                  jl = journal->j_current_jl;
                  trans_id = jl->j_trans_id;
                  if (wait_on_commit)
                        jl->j_state |= LIST_COMMIT_PENDING;
                  atomic_set(&(journal->j_jlock), 1);
                  if (flush) {
                        journal->j_next_full_flush = 1;
                  }
                  unlock_journal(sb);

                  /* sleep while the current transaction is still j_jlocked */
                  while (journal->j_trans_id == trans_id) {
                        if (atomic_read(&journal->j_jlock)) {
                              queue_log_writer(sb);
                        } else {
                              lock_journal(sb);
                              if (journal->j_trans_id == trans_id) {
                                    atomic_set(&(journal->j_jlock),
                                             1);
                              }
                              unlock_journal(sb);
                        }
                  }
                  BUG_ON(journal->j_trans_id == trans_id);
                  
                  if (commit_now
                      && journal_list_still_alive(sb, trans_id)
                      && wait_on_commit) {
                        flush_commit_list(sb, jl, 1);
                  }
                  return 0;
            }
            unlock_journal(sb);
            return 0;
      }

      /* deal with old transactions where we are the last writers */
      now = get_seconds();
      if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
            commit_now = 1;
            journal->j_next_async_flush = 1;
      }
      /* don't batch when someone is waiting on j_join_wait */
      /* don't batch when syncing the commit or flushing the whole trans */
      if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
          && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
          && journal->j_len_alloc < journal->j_max_batch
          && journal->j_cnode_free > (journal->j_trans_max * 3)) {
            journal->j_bcount++;
            unlock_journal(sb);
            return 0;
      }

      if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
            reiserfs_panic(sb, "journal-003",
                         "j_start (%ld) is too high",
                         journal->j_start);
      }
      return 1;
}

/*
** Does all the work that makes deleting blocks safe.
** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
**
** otherwise:
** set a bit for the block in the journal bitmap.  That will prevent it from being allocated for unformatted nodes
** before this transaction has finished.
**
** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.  That will prevent any old transactions with
** this block from trying to flush to the real location.  Since we aren't removing the cnode from the journal_list_hash,
** the block can't be reallocated yet.
**
** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
*/
int journal_mark_freed(struct reiserfs_transaction_handle *th,
                   struct super_block *sb, b_blocknr_t blocknr)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_journal_cnode *cn = NULL;
      struct buffer_head *bh = NULL;
      struct reiserfs_list_bitmap *jb = NULL;
      int cleaned = 0;
      BUG_ON(!th->t_trans_id);

      cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
      if (cn && cn->bh) {
            bh = cn->bh;
            get_bh(bh);
      }
      /* if it is journal new, we just remove it from this transaction */
      if (bh && buffer_journal_new(bh)) {
            clear_buffer_journal_new(bh);
            clear_prepared_bits(bh);
            reiserfs_clean_and_file_buffer(bh);
            cleaned = remove_from_transaction(sb, blocknr, cleaned);
      } else {
            /* set the bit for this block in the journal bitmap for this transaction */
            jb = journal->j_current_jl->j_list_bitmap;
            if (!jb) {
                  reiserfs_panic(sb, "journal-1702",
                               "journal_list_bitmap is NULL");
            }
            set_bit_in_list_bitmap(sb, blocknr, jb);

            /* Note, the entire while loop is not allowed to schedule.  */

            if (bh) {
                  clear_prepared_bits(bh);
                  reiserfs_clean_and_file_buffer(bh);
            }
            cleaned = remove_from_transaction(sb, blocknr, cleaned);

            /* find all older transactions with this block, make sure they don't try to write it out */
            cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
                                blocknr);
            while (cn) {
                  if (sb == cn->sb && blocknr == cn->blocknr) {
                        set_bit(BLOCK_FREED, &cn->state);
                        if (cn->bh) {
                              if (!cleaned) {
                                    /* remove_from_transaction will brelse the buffer if it was 
                                     ** in the current trans
                                     */
                                    clear_buffer_journal_dirty(cn->
                                                         bh);
                                    clear_buffer_dirty(cn->bh);
                                    clear_buffer_journal_test(cn->
                                                        bh);
                                    cleaned = 1;
                                    put_bh(cn->bh);
                                    if (atomic_read
                                        (&(cn->bh->b_count)) < 0) {
                                          reiserfs_warning(sb,
                                                 "journal-2138",
                                                 "cn->bh->b_count < 0");
                                    }
                              }
                              if (cn->jlist) {  /* since we are clearing the bh, we MUST dec nonzerolen */
                                    atomic_dec(&
                                             (cn->jlist->
                                              j_nonzerolen));
                              }
                              cn->bh = NULL;
                        }
                  }
                  cn = cn->hnext;
            }
      }

      if (bh)
            release_buffer_page(bh); /* get_hash grabs the buffer */
      return 0;
}

void reiserfs_update_inode_transaction(struct inode *inode)
{
      struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
      REISERFS_I(inode)->i_jl = journal->j_current_jl;
      REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
}

/*
 * returns -1 on error, 0 if no commits/barriers were done and 1
 * if a transaction was actually committed and the barrier was done
 */
static int __commit_trans_jl(struct inode *inode, unsigned long id,
                       struct reiserfs_journal_list *jl)
{
      struct reiserfs_transaction_handle th;
      struct super_block *sb = inode->i_sb;
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      int ret = 0;

      /* is it from the current transaction, or from an unknown transaction? */
      if (id == journal->j_trans_id) {
            jl = journal->j_current_jl;
            /* try to let other writers come in and grow this transaction */
            let_transaction_grow(sb, id);
            if (journal->j_trans_id != id) {
                  goto flush_commit_only;
            }

            ret = journal_begin(&th, sb, 1);
            if (ret)
                  return ret;

            /* someone might have ended this transaction while we joined */
            if (journal->j_trans_id != id) {
                  reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
                                         1);
                  journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
                  ret = journal_end(&th, sb, 1);
                  goto flush_commit_only;
            }

            ret = journal_end_sync(&th, sb, 1);
            if (!ret)
                  ret = 1;

      } else {
            /* this gets tricky, we have to make sure the journal list in
             * the inode still exists.  We know the list is still around
             * if we've got a larger transaction id than the oldest list
             */
            flush_commit_only:
            if (journal_list_still_alive(inode->i_sb, id)) {
                  /*
                   * we only set ret to 1 when we know for sure
                   * the barrier hasn't been started yet on the commit
                   * block.
                   */
                  if (atomic_read(&jl->j_commit_left) > 1)
                        ret = 1;
                  flush_commit_list(sb, jl, 1);
                  if (journal->j_errno)
                        ret = journal->j_errno;
            }
      }
      /* otherwise the list is gone, and long since committed */
      return ret;
}

int reiserfs_commit_for_inode(struct inode *inode)
{
      unsigned int id = REISERFS_I(inode)->i_trans_id;
      struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;

      /* for the whole inode, assume unset id means it was
       * changed in the current transaction.  More conservative
       */
      if (!id || !jl) {
            reiserfs_update_inode_transaction(inode);
            id = REISERFS_I(inode)->i_trans_id;
            /* jl will be updated in __commit_trans_jl */
      }

      return __commit_trans_jl(inode, id, jl);
}

void reiserfs_restore_prepared_buffer(struct super_block *sb,
                              struct buffer_head *bh)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      PROC_INFO_INC(sb, journal.restore_prepared);
      if (!bh) {
            return;
      }
      if (test_clear_buffer_journal_restore_dirty(bh) &&
          buffer_journal_dirty(bh)) {
            struct reiserfs_journal_cnode *cn;
            cn = get_journal_hash_dev(sb,
                                journal->j_list_hash_table,
                                bh->b_blocknr);
            if (cn && can_dirty(cn)) {
                  set_buffer_journal_test(bh);
                  mark_buffer_dirty(bh);
            }
      }
      clear_buffer_journal_prepared(bh);
}

extern struct tree_balance *cur_tb;
/*
** before we can change a metadata block, we have to make sure it won't
** be written to disk while we are altering it.  So, we must:
** clean it
** wait on it.
**
*/
int reiserfs_prepare_for_journal(struct super_block *sb,
                         struct buffer_head *bh, int wait)
{
      PROC_INFO_INC(sb, journal.prepare);

      if (!trylock_buffer(bh)) {
            if (!wait)
                  return 0;
            lock_buffer(bh);
      }
      set_buffer_journal_prepared(bh);
      if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
            clear_buffer_journal_test(bh);
            set_buffer_journal_restore_dirty(bh);
      }
      unlock_buffer(bh);
      return 1;
}

static void flush_old_journal_lists(struct super_block *s)
{
      struct reiserfs_journal *journal = SB_JOURNAL(s);
      struct reiserfs_journal_list *jl;
      struct list_head *entry;
      time_t now = get_seconds();

      while (!list_empty(&journal->j_journal_list)) {
            entry = journal->j_journal_list.next;
            jl = JOURNAL_LIST_ENTRY(entry);
            /* this check should always be run, to send old lists to disk */
            if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
                atomic_read(&jl->j_commit_left) == 0 &&
                test_transaction(s, jl)) {
                  flush_used_journal_lists(s, jl);
            } else {
                  break;
            }
      }
}

/*
** long and ugly.  If flush, will not return until all commit
** blocks and all real buffers in the trans are on disk.
** If no_async, won't return until all commit blocks are on disk.
**
** keep reading, there are comments as you go along
**
** If the journal is aborted, we just clean up. Things like flushing
** journal lists, etc just won't happen.
*/
static int do_journal_end(struct reiserfs_transaction_handle *th,
                    struct super_block *sb, unsigned long nblocks,
                    int flags)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      struct reiserfs_journal_cnode *cn, *next, *jl_cn;
      struct reiserfs_journal_cnode *last_cn = NULL;
      struct reiserfs_journal_desc *desc;
      struct reiserfs_journal_commit *commit;
      struct buffer_head *c_bh;     /* commit bh */
      struct buffer_head *d_bh;     /* desc bh */
      int cur_write_start = 0;      /* start index of current log write */
      int old_start;
      int i;
      int flush;
      int wait_on_commit;
      struct reiserfs_journal_list *jl, *temp_jl;
      struct list_head *entry, *safe;
      unsigned long jindex;
      unsigned int commit_trans_id;
      int trans_half;

      BUG_ON(th->t_refcount > 1);
      BUG_ON(!th->t_trans_id);

      /* protect flush_older_commits from doing mistakes if the
           transaction ID counter gets overflowed.  */
      if (th->t_trans_id == ~0U)
            flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
      flush = flags & FLUSH_ALL;
      wait_on_commit = flags & WAIT;

      put_fs_excl();
      current->journal_info = th->t_handle_save;
      reiserfs_check_lock_depth(sb, "journal end");
      if (journal->j_len == 0) {
            reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
                                   1);
            journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
      }

      lock_journal(sb);
      if (journal->j_next_full_flush) {
            flags |= FLUSH_ALL;
            flush = 1;
      }
      if (journal->j_next_async_flush) {
            flags |= COMMIT_NOW | WAIT;
            wait_on_commit = 1;
      }

      /* check_journal_end locks the journal, and unlocks if it does not return 1
       ** it tells us if we should continue with the journal_end, or just return
       */
      if (!check_journal_end(th, sb, nblocks, flags)) {
            sb->s_dirt = 1;
            wake_queued_writers(sb);
            reiserfs_async_progress_wait(sb);
            goto out;
      }

      /* check_journal_end might set these, check again */
      if (journal->j_next_full_flush) {
            flush = 1;
      }

      /*
       ** j must wait means we have to flush the log blocks, and the real blocks for
       ** this transaction
       */
      if (journal->j_must_wait > 0) {
            flush = 1;
      }
#ifdef REISERFS_PREALLOCATE
      /* quota ops might need to nest, setup the journal_info pointer for them
       * and raise the refcount so that it is > 0. */
      current->journal_info = th;
      th->t_refcount++;
      reiserfs_discard_all_prealloc(th);  /* it should not involve new blocks into
                                     * the transaction */
      th->t_refcount--;
      current->journal_info = th->t_handle_save;
#endif

      /* setup description block */
      d_bh =
          journal_getblk(sb,
                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                     journal->j_start);
      set_buffer_uptodate(d_bh);
      desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
      memset(d_bh->b_data, 0, d_bh->b_size);
      memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
      set_desc_trans_id(desc, journal->j_trans_id);

      /* setup commit block.  Don't write (keep it clean too) this one until after everyone else is written */
      c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                        ((journal->j_start + journal->j_len +
                        1) % SB_ONDISK_JOURNAL_SIZE(sb)));
      commit = (struct reiserfs_journal_commit *)c_bh->b_data;
      memset(c_bh->b_data, 0, c_bh->b_size);
      set_commit_trans_id(commit, journal->j_trans_id);
      set_buffer_uptodate(c_bh);

      /* init this journal list */
      jl = journal->j_current_jl;

      /* we lock the commit before doing anything because
       * we want to make sure nobody tries to run flush_commit_list until
       * the new transaction is fully setup, and we've already flushed the
       * ordered bh list
       */
      mutex_lock(&jl->j_commit_mutex);

      /* save the transaction id in case we need to commit it later */
      commit_trans_id = jl->j_trans_id;

      atomic_set(&jl->j_older_commits_done, 0);
      jl->j_trans_id = journal->j_trans_id;
      jl->j_timestamp = journal->j_trans_start_time;
      jl->j_commit_bh = c_bh;
      jl->j_start = journal->j_start;
      jl->j_len = journal->j_len;
      atomic_set(&jl->j_nonzerolen, journal->j_len);
      atomic_set(&jl->j_commit_left, journal->j_len + 2);
      jl->j_realblock = NULL;

      /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
       **  for each real block, add it to the journal list hash,
       ** copy into real block index array in the commit or desc block
       */
      trans_half = journal_trans_half(sb->s_blocksize);
      for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
            if (buffer_journaled(cn->bh)) {
                  jl_cn = get_cnode(sb);
                  if (!jl_cn) {
                        reiserfs_panic(sb, "journal-1676",
                                     "get_cnode returned NULL");
                  }
                  if (i == 0) {
                        jl->j_realblock = jl_cn;
                  }
                  jl_cn->prev = last_cn;
                  jl_cn->next = NULL;
                  if (last_cn) {
                        last_cn->next = jl_cn;
                  }
                  last_cn = jl_cn;
                  /* make sure the block we are trying to log is not a block
                     of journal or reserved area */

                  if (is_block_in_log_or_reserved_area
                      (sb, cn->bh->b_blocknr)) {
                        reiserfs_panic(sb, "journal-2332",
                                     "Trying to log block %lu, "
                                     "which is a log block",
                                     cn->bh->b_blocknr);
                  }
                  jl_cn->blocknr = cn->bh->b_blocknr;
                  jl_cn->state = 0;
                  jl_cn->sb = sb;
                  jl_cn->bh = cn->bh;
                  jl_cn->jlist = jl;
                  insert_journal_hash(journal->j_list_hash_table, jl_cn);
                  if (i < trans_half) {
                        desc->j_realblock[i] =
                            cpu_to_le32(cn->bh->b_blocknr);
                  } else {
                        commit->j_realblock[i - trans_half] =
                            cpu_to_le32(cn->bh->b_blocknr);
                  }
            } else {
                  i--;
            }
      }
      set_desc_trans_len(desc, journal->j_len);
      set_desc_mount_id(desc, journal->j_mount_id);
      set_desc_trans_id(desc, journal->j_trans_id);
      set_commit_trans_len(commit, journal->j_len);

      /* special check in case all buffers in the journal were marked for not logging */
      BUG_ON(journal->j_len == 0);

      /* we're about to dirty all the log blocks, mark the description block
       * dirty now too.  Don't mark the commit block dirty until all the
       * others are on disk
       */
      mark_buffer_dirty(d_bh);

      /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
      cur_write_start = journal->j_start;
      cn = journal->j_first;
      jindex = 1;       /* start at one so we don't get the desc again */
      while (cn) {
            clear_buffer_journal_new(cn->bh);
            /* copy all the real blocks into log area.  dirty log blocks */
            if (buffer_journaled(cn->bh)) {
                  struct buffer_head *tmp_bh;
                  char *addr;
                  struct page *page;
                  tmp_bh =
                      journal_getblk(sb,
                                 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
                                 ((cur_write_start +
                                   jindex) %
                                  SB_ONDISK_JOURNAL_SIZE(sb)));
                  set_buffer_uptodate(tmp_bh);
                  page = cn->bh->b_page;
                  addr = kmap(page);
                  memcpy(tmp_bh->b_data,
                         addr + offset_in_page(cn->bh->b_data),
                         cn->bh->b_size);
                  kunmap(page);
                  mark_buffer_dirty(tmp_bh);
                  jindex++;
                  set_buffer_journal_dirty(cn->bh);
                  clear_buffer_journaled(cn->bh);
            } else {
                  /* JDirty cleared sometime during transaction.  don't log this one */
                  reiserfs_warning(sb, "journal-2048",
                               "BAD, buffer in journal hash, "
                               "but not JDirty!");
                  brelse(cn->bh);
            }
            next = cn->next;
            free_cnode(sb, cn);
            cn = next;
            cond_resched();
      }

      /* we are done  with both the c_bh and d_bh, but
       ** c_bh must be written after all other commit blocks,
       ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
       */

      journal->j_current_jl = alloc_journal_list(sb);

      /* now it is safe to insert this transaction on the main list */
      list_add_tail(&jl->j_list, &journal->j_journal_list);
      list_add_tail(&jl->j_working_list, &journal->j_working_list);
      journal->j_num_work_lists++;

      /* reset journal values for the next transaction */
      old_start = journal->j_start;
      journal->j_start =
          (journal->j_start + journal->j_len +
           2) % SB_ONDISK_JOURNAL_SIZE(sb);
      atomic_set(&(journal->j_wcount), 0);
      journal->j_bcount = 0;
      journal->j_last = NULL;
      journal->j_first = NULL;
      journal->j_len = 0;
      journal->j_trans_start_time = 0;
      /* check for trans_id overflow */
      if (++journal->j_trans_id == 0)
            journal->j_trans_id = 10;
      journal->j_current_jl->j_trans_id = journal->j_trans_id;
      journal->j_must_wait = 0;
      journal->j_len_alloc = 0;
      journal->j_next_full_flush = 0;
      journal->j_next_async_flush = 0;
      init_journal_hash(sb);

      // make sure reiserfs_add_jh sees the new current_jl before we
      // write out the tails
      smp_mb();

      /* tail conversion targets have to hit the disk before we end the
       * transaction.  Otherwise a later transaction might repack the tail
       * before this transaction commits, leaving the data block unflushed and
       * clean, if we crash before the later transaction commits, the data block
       * is lost.
       */
      if (!list_empty(&jl->j_tail_bh_list)) {
            unlock_kernel();
            write_ordered_buffers(&journal->j_dirty_buffers_lock,
                              journal, jl, &jl->j_tail_bh_list);
            lock_kernel();
      }
      BUG_ON(!list_empty(&jl->j_tail_bh_list));
      mutex_unlock(&jl->j_commit_mutex);

      /* honor the flush wishes from the caller, simple commits can
       ** be done outside the journal lock, they are done below
       **
       ** if we don't flush the commit list right now, we put it into
       ** the work queue so the people waiting on the async progress work
       ** queue don't wait for this proc to flush journal lists and such.
       */
      if (flush) {
            flush_commit_list(sb, jl, 1);
            flush_journal_list(sb, jl, 1);
      } else if (!(jl->j_state & LIST_COMMIT_PENDING))
            queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);

      /* if the next transaction has any chance of wrapping, flush
       ** transactions that might get overwritten.  If any journal lists are very
       ** old flush them as well.
       */
      first_jl:
      list_for_each_safe(entry, safe, &journal->j_journal_list) {
            temp_jl = JOURNAL_LIST_ENTRY(entry);
            if (journal->j_start <= temp_jl->j_start) {
                  if ((journal->j_start + journal->j_trans_max + 1) >=
                      temp_jl->j_start) {
                        flush_used_journal_lists(sb, temp_jl);
                        goto first_jl;
                  } else if ((journal->j_start +
                            journal->j_trans_max + 1) <
                           SB_ONDISK_JOURNAL_SIZE(sb)) {
                        /* if we don't cross into the next transaction and we don't
                         * wrap, there is no way we can overlap any later transactions
                         * break now
                         */
                        break;
                  }
            } else if ((journal->j_start +
                      journal->j_trans_max + 1) >
                     SB_ONDISK_JOURNAL_SIZE(sb)) {
                  if (((journal->j_start + journal->j_trans_max + 1) %
                       SB_ONDISK_JOURNAL_SIZE(sb)) >=
                      temp_jl->j_start) {
                        flush_used_journal_lists(sb, temp_jl);
                        goto first_jl;
                  } else {
                        /* we don't overlap anything from out start to the end of the
                         * log, and our wrapped portion doesn't overlap anything at
                         * the start of the log.  We can break
                         */
                        break;
                  }
            }
      }
      flush_old_journal_lists(sb);

      journal->j_current_jl->j_list_bitmap =
          get_list_bitmap(sb, journal->j_current_jl);

      if (!(journal->j_current_jl->j_list_bitmap)) {
            reiserfs_panic(sb, "journal-1996",
                         "could not get a list bitmap");
      }

      atomic_set(&(journal->j_jlock), 0);
      unlock_journal(sb);
      /* wake up any body waiting to join. */
      clear_bit(J_WRITERS_QUEUED, &journal->j_state);
      wake_up(&(journal->j_join_wait));

      if (!flush && wait_on_commit &&
          journal_list_still_alive(sb, commit_trans_id)) {
            flush_commit_list(sb, jl, 1);
      }
      out:
      reiserfs_check_lock_depth(sb, "journal end2");

      memset(th, 0, sizeof(*th));
      /* Re-set th->t_super, so we can properly keep track of how many
       * persistent transactions there are. We need to do this so if this
       * call is part of a failed restart_transaction, we can free it later */
      th->t_super = sb;

      return journal->j_errno;
}

/* Send the file system read only and refuse new transactions */
void reiserfs_abort_journal(struct super_block *sb, int errno)
{
      struct reiserfs_journal *journal = SB_JOURNAL(sb);
      if (test_bit(J_ABORTED, &journal->j_state))
            return;

      if (!journal->j_errno)
            journal->j_errno = errno;

      sb->s_flags |= MS_RDONLY;
      set_bit(J_ABORTED, &journal->j_state);

#ifdef CONFIG_REISERFS_CHECK
      dump_stack();
#endif
}


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