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 // SPDX-License-Identifier: GPL-2.0
 /*
  * Write ahead logging implementation copyright Chris Mason 2000
  *
  * The background commits make this code very interrelated, 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
  *              within kupdate, it will ignore the immediate flag
  */
 
 #include <linux/time.h>
 #include <linux/semaphore.h>
 #include <linux/vmalloc.h>
 #include "reiserfs.h"
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/fcntl.h>
 #include <linux/stat.h>
 #include <linux/string.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 <linux/slab.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))
 
 /* must be correct to keep the desc and commit structs at 4k */
 #define JOURNAL_TRANS_HALF 1018
 #define BUFNR 64        /*read ahead */
 
 /* cnode stat bits.  Move these into reiserfs_fs.h */
 
 /* this block was freed, and can't be written.  */
 #define BLOCK_FREED 2
 /* this block was freed during this transaction, and can't be written */
 #define BLOCK_FREED_HOLDER 3
 
 /* used in flush_journal_list */
 #define BLOCK_NEEDS_FLUSH 4
 #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 *, 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);
 static void release_journal_dev(struct super_block *super,
                    struct reiserfs_journal *journal);
 static void 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 */
     /* join the running transaction if at all possible */
     JBEGIN_JOIN = 1,
     /* called from cleanup code, ignores aborted flag */
     JBEGIN_ABORT = 2,
 };
 
 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 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 {
             /* this is ok, we'll try again when more are needed */
             break;
         }
     }
 }
 
 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 = vzalloc(mem);
         if (!jb->bitmaps) {
             reiserfs_warning(sb, "clm-2000", "unable to "
                      "allocate bitmaps for journal lists");
             failed = 1;
             break;
         }
     }
     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;
         }
     }
     /* double check to make sure if flushed correctly */
     if (jb->journal_list)
         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 = vzalloc(array_size(num_cnodes,
                   sizeof(struct reiserfs_journal_cnode)));
     if (!head) {
         return NULL;
     }
     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);
 }
 
 /*
  * 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_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
         && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
         return 1;
     }
 
     /* is it in the current transaction.  This should never happen */
     if ((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);
 
     reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
 }
 
 /* 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 put_page drop the page from the lru.
  */
 static void release_buffer_page(struct buffer_head *bh)
 {
     struct folio *folio = page_folio(bh->b_page);
     if (!folio->mapping && folio_trylock(folio)) {
         folio_get(folio);
         put_bh(bh);
         if (!folio->mapping)
             try_to_free_buffers(folio);
         folio_unlock(folio);
         folio_put(folio);
     } else {
         put_bh(bh);
     }
 }
 
 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
 {
     if (buffer_journaled(bh)) {
         reiserfs_warning(NULL, "clm-2084",
                  "pinned buffer %lu:%pg sent to disk",
                  bh->b_blocknr, bh->b_bdev);
     }
     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(REQ_OP_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(REQ_OP_WRITE, bh);
 }
 
 #define CHUNK_SIZE 32
 struct buffer_chunk {
     struct buffer_head *bh[CHUNK_SIZE];
     int nr;
 };
 
 static void write_chunk(struct buffer_chunk *chunk)
 {
     int i;
     for (i = 0; i < chunk->nr; i++) {
         submit_logged_buffer(chunk->bh[i]);
     }
     chunk->nr = 0;
 }
 
 static void write_ordered_chunk(struct buffer_chunk *chunk)
 {
     int i;
     for (i = 0; i < chunk->nr; i++) {
         submit_ordered_buffer(chunk->bh[i]);
     }
     chunk->nr = 0;
 }
 
 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);
             spin_lock(lock);
         } else {
             fn(chunk);
         }
     }
     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 invalidate_folio here.
          * reiserfs_invalidate_folio 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(REQ_OP_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;
 
 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;
     }
 
     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)
 {
     struct reiserfs_journal *j = SB_JOURNAL(s);
 
     if (atomic_read(&j->j_async_throttle)) {
         int depth;
 
         depth = reiserfs_write_unlock_nested(s);
         wait_var_event_timeout(&j->j_async_throttle,
                        atomic_read(&j->j_async_throttle) == 0,
                        HZ / 10);
         reiserfs_write_lock_nested(s, depth);
     }
 
     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 retval = 0;
     int write_len;
     int depth;
 
     reiserfs_check_lock_depth(s, "flush_commit_list");
 
     if (atomic_read(&jl->j_older_commits_done)) {
         return 0;
     }
 
     /*
      * 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 */
     reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
 
     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;
 
         /*
          * We might sleep in numerous places inside
          * write_ordered_buffers. Relax the write lock.
          */
         depth = reiserfs_write_unlock_nested(s);
         ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
                         journal, jl, &jl->j_bh_list);
         if (ret < 0 && retval == 0)
             retval = ret;
         reiserfs_write_lock_nested(s, depth);
     }
     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)) {
                     depth = reiserfs_write_unlock_nested(s);
                 ll_rw_block(REQ_OP_WRITE, 1, &tbh);
                 reiserfs_write_lock_nested(s, depth);
             }
             put_bh(tbh) ;
         }
     }
     if (atomic_dec_and_test(&journal->j_async_throttle))
         wake_up_var(&journal->j_async_throttle);
 
     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);
 
         depth = reiserfs_write_unlock_nested(s);
         __wait_on_buffer(tbh);
         reiserfs_write_lock_nested(s, depth);
         /*
          * since we're using ll_rw_blk above, it might have skipped
          * over a locked buffer.  Double check here
          */
         /* redundant, sync_dirty_buffer() checks */
         if (buffer_dirty(tbh)) {
             depth = reiserfs_write_unlock_nested(s);
             sync_dirty_buffer(tbh);
             reiserfs_write_lock_nested(s, depth);
         }
         if (unlikely(!buffer_uptodate(tbh))) {
 #ifdef CONFIG_REISERFS_CHECK
             reiserfs_warning(s, "journal-601",
                      "buffer write failed");
 #endif
             retval = -EIO;
         }
         /* once for journal_find_get_block */
         put_bh(tbh);
         /* once due to original getblk in do_journal_end */
         put_bh(tbh);
         atomic_dec(&jl->j_commit_left);
     }
 
     BUG_ON(atomic_read(&jl->j_commit_left) != 1);
 
     /*
      * 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) ;
         depth = reiserfs_write_unlock_nested(s);
         if (reiserfs_barrier_flush(s))
             __sync_dirty_buffer(jl->j_commit_bh,
                     REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
         else
             sync_dirty_buffer(jl->j_commit_bh);
         reiserfs_write_lock_nested(s, depth);
     }
 
     /*
      * 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__);
     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 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);
     int depth;
 
     if (reiserfs_is_journal_aborted(journal))
         return -EIO;
 
     if (trans_id >= journal->j_last_flush_trans_id) {
         if (buffer_locked((journal->j_header_bh))) {
             depth = reiserfs_write_unlock_nested(sb);
             __wait_on_buffer(journal->j_header_bh);
             reiserfs_write_lock_nested(sb, depth);
             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);
 
         set_buffer_dirty(journal->j_header_bh);
         depth = reiserfs_write_unlock_nested(sb);
 
         if (reiserfs_barrier_flush(sb))
             __sync_dirty_buffer(journal->j_header_bh,
                     REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
         else
             sync_dirty_buffer(journal->j_header_bh);
 
         reiserfs_write_lock_nested(sb, depth);
         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;
     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;
     int depth;
 
     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));
     }
 
     /* if flushall == 0, the lock is already held */
     if (flushall) {
         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
     } 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;
     }
 
     /* 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 transaction",
                      (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:
         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");
                 }
 
                 depth = reiserfs_write_unlock_nested(s);
                 __wait_on_buffer(cn->bh);
                 reiserfs_write_lock_nested(s, depth);
 
                 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);
     return err;
 }
 
 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 void dirty_one_transaction(struct super_block *s,
                  struct reiserfs_journal_list *jl)
 {
     struct reiserfs_journal_cnode *cn;
     struct reiserfs_journal_list *pjl;
 
     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;
     }
 }
 
 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;
 
     reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
     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 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);
     }
     get_journal_list(jl);
     get_journal_list(flush_jl);
 
     /*
      * 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)
         kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
 
     flush_journal_list(s, flush_jl, 1);
     put_journal_list(s, flush_jl);
     put_journal_list(s, jl);
     return 0;
 }
 
 /*
  * removes any nodes in table with name block and dev as bh.
  * only touchs the hnext and hprev pointers.
  */
 static 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;
             /*
              * anybody who clears the cur->bh will also
              * dec the nonzerolen
              */
             if (cur->bh && cur->jlist)
                 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;
     struct reiserfs_journal *journal = SB_JOURNAL(sb);
 
     /*
      * we only want to flush out transactions if we were
      * called with error == 0
      */
     if (!error && !sb_rdonly(sb)) {
         /* end the current trans */
         BUG_ON(!th->t_trans_id);
         do_journal_end(th, FLUSH_ALL);
 
         /*
          * make sure something gets logged to force
          * our way into the flush code
          */
         if (!journal_join(&myth, sb)) {
             reiserfs_prepare_for_journal(sb,
                              SB_BUFFER_WITH_SB(sb),
                              1);
             journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
             do_journal_end(&myth, FLUSH_ALL);
         }
     }
 
     /* 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)) {
             reiserfs_prepare_for_journal(sb,
                              SB_BUFFER_WITH_SB(sb),
                              1);
             journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
             do_journal_end(&myth, FLUSH_ALL);
         }
     }
 
 
     /*
      * We must release the write lock here because
      * the workqueue job (flush_async_commit) needs this lock
      */
     reiserfs_write_unlock(sb);
 
     /*
      * Cancel flushing of old commits. Note that neither of these works
      * will be requeued because superblock is being shutdown and doesn't
      * have SB_ACTIVE set.
      */
     reiserfs_cancel_old_flush(sb);
     /* wait for all commits to finish */
     cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
 
     free_journal_ram(sb);
 
     reiserfs_write_lock(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
  * NOTE: only called during fs mount
  */
 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,
          * let's 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.
  * NOTE: only called during fs mount
  */
 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;
     }
 
     if (bdev_read_only(sb->s_bdev)) {
         reiserfs_warning(sb, "clm-2076",
                  "device is readonly, unable to replay log");
         brelse(c_bh);
         brelse(d_bh);
         return -EROFS;
     }
 
     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_array(get_desc_trans_len(desc),
                    sizeof(struct buffer_head *),
                    GFP_NOFS);
     real_blocks = kmalloc_array(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(REQ_OP_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]);
         write_dirty_buffer(real_blocks[i], 0);
     }
     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(REQ_OP_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.
  * NOTE: only called during fs mount
  */
 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;
     time64_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;
 
     cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
     reiserfs_info(sb, "checking transaction log (%pg)\n",
               journal->j_dev_bd);
     start = ktime_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;
     }
 
     /*
      * 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, ktime_get_seconds() - start);
     }
     /* needed to satisfy the locking in _update_journal_header_block */
     reiserfs_write_lock(sb);
     if (!bdev_read_only(sb->s_bdev) &&
         _update_journal_header_block(sb, journal->j_start,
                      journal->j_last_flush_trans_id)) {
         reiserfs_write_unlock(sb);
         /*
          * replay failed, caller must call free_journal_ram and abort
          * the mount
          */
         return -1;
     }
     reiserfs_write_unlock(sb);
     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 void release_journal_dev(struct super_block *super,
                    struct reiserfs_journal *journal)
 {
     if (journal->j_dev_bd != NULL) {
         blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
         journal->j_dev_bd = NULL;
     }
 }
 
 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 | FMODE_EXCL;
 
     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])) {
         if (jdev == super->s_dev)
             blkdev_mode &= ~FMODE_EXCL;
         journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
                               journal);
         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 unknown-block(%u,%u): %i",
                      MAJOR(jdev), MINOR(jdev), result);
             return result;
         } else if (jdev != super->s_dev)
             set_blocksize(journal->j_dev_bd, super->s_blocksize);
 
         return 0;
     }
 
     journal->j_dev_mode = blkdev_mode;
     journal->j_dev_bd = blkdev_get_by_path(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, "sh-457",
                  "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: %pg\n",
               journal->j_dev_bd);
     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;
     int ret;
 
     journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
     if (!journal) {
         reiserfs_warning(sb, "journal-1256",
                  "unable to get memory for journal structure");
         return 1;
     }
     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
      * within 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;
     }
 
     /*
      * Sanity check to see if journal first block is correct.
      * If journal first block is invalid it can cause
      * zeroing important superblock members.
      */
     if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
         SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) {
         reiserfs_warning(sb, "journal-1393",
                  "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d",
                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
                  SB_ONDISK_JOURNAL_1st_BLOCK(sb));
         goto free_and_return;
     }
 
     if (journal_init_dev(sb, journal, j_dev_name) != 0) {
         reiserfs_warning(sb, "sh-462",
                  "unable to initialize journal 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 %pg) does "
                  "not match to magic found in super block %x",
                  jh->jh_journal.jp_journal_magic,
                  journal->j_dev_bd,
                  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 %pg, size %u, "
               "journal first block %u, max trans len %u, max batch %u, "
               "max commit age %u, max trans age %u\n",
               journal->j_dev_bd,
               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;
 
     /*
      * get_list_bitmap() may call flush_commit_list() which
      * requires the lock. Calling flush_commit_list() shouldn't happen
      * this early but I like to be paranoid.
      */
     reiserfs_write_lock(sb);
     jl->j_list_bitmap = get_list_bitmap(sb, jl);
     reiserfs_write_unlock(sb);
     if (!jl->j_list_bitmap) {
         reiserfs_warning(sb, "journal-2005",
                  "get_list_bitmap failed for journal list 0");
         goto free_and_return;
     }
 
     ret = journal_read(sb);
     if (ret < 0) {
         reiserfs_warning(sb, "reiserfs-2006",
                  "Replay Failure, unable to mount");
         goto free_and_return;
     }
 
     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);
     time64_t now = ktime_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;
     }
 
     journal->j_len_alloc += new_alloc;
     th->t_blocks_allocated += new_alloc ;
     return 0;
 }
 
 /* this must be called inside a transaction */
 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 */
 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 */
 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_entry_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)) {
         int depth = reiserfs_write_unlock_nested(s);
         schedule();
         reiserfs_write_lock_nested(s, depth);
     }
     __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) {
         int depth;
 
         depth = reiserfs_write_unlock_nested(sb);
         schedule_timeout_uninterruptible(1);
         reiserfs_write_lock_nested(sb, depth);
 
         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)
 {
     time64_t now = ktime_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;
     int depth;
 
     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);
         depth = reiserfs_write_unlock_nested(sb);
         reiserfs_wait_on_write_block(sb);
         reiserfs_write_lock_nested(sb, depth);
         PROC_INFO_INC(sb, journal.journal_relock_writers);
         goto relock;
     }
     now = ktime_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;
         /* allow others to finish this transaction */
         unlock_journal(sb);
 
         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);
         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, 0);
         } else {
             retval = do_journal_end(&myth, 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 = ktime_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);
     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);
     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)
 {
     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, 1, JBEGIN_JOIN);
 }
 
 int journal_join_abort(struct reiserfs_transaction_handle *th,
                struct super_block *sb)
 {
     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, 1, 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 buffer_head *bh)
 {
     struct super_block *sb = th->t_super;
     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);
     }
 
     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;
     }
     reiserfs_schedule_old_flush(sb);
     return 0;
 }
 
 int journal_end(struct reiserfs_transaction_handle *th)
 {
     struct super_block *sb = th->t_super;
     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, 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;
     }
     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 = th->t_super;
     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_BUFFER_WITH_SB(sb));
     }
     return do_journal_end(th, 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;
 
     reiserfs_write_lock(sb);
     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);
     }
     reiserfs_write_unlock(sb);
 }
 
 /*
  * flushes any old transactions to disk
  * ends the current transaction if it is too old
  */
 void reiserfs_flush_old_commits(struct super_block *sb)
 {
     time64_t now;
     struct reiserfs_transaction_handle th;
     struct reiserfs_journal *journal = SB_JOURNAL(sb);
 
     now = ktime_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;
 
     /*
      * 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)) {
             reiserfs_prepare_for_journal(sb,
                              SB_BUFFER_WITH_SB(sb),
                              1);
             journal_mark_dirty(&th, 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, COMMIT_NOW | WAIT);
         }
     }
 }
 
 /*
  * 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, int flags)
 {
 
     time64_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 super_block *sb = th->t_super;
     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);
     /* <= 0 is allowed.  unmounting might not call begin */
     if (atomic_read(&journal->j_wcount) > 0)
         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 = ktime_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) {
                     /*
                      * remove_from_transaction will brelse
                      * the buffer if it was in the current
                      * trans
                      */
                     if (!cleaned) {
                         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");
                         }
                     }
                     /*
                      * since we are clearing the bh,
                      * we MUST dec nonzerolen
                      */
                     if (cn->jlist) {
                         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_BUFFER_WITH_SB(sb));
             ret = journal_end(&th);
             goto flush_commit_only;
         }
 
         ret = journal_end_sync(&th);
         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;
         reiserfs_write_lock(sb);
         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);
         }
         reiserfs_write_unlock(sb);
     }
     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;
 }
 
 /*
  * 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, int flags)
 {
     struct super_block *sb = th->t_super;
     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 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;
     int depth;
 
     BUG_ON(th->t_refcount > 1);
     BUG_ON(!th->t_trans_id);
     BUG_ON(!th->t_super);
 
     /*
      * 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;
 
     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_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, flags)) {
         reiserfs_schedule_old_flush(sb);
         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++;
 
     /* it should not involve new blocks into the transaction */
     reiserfs_discard_all_prealloc(th);
 
     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
      */
     reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
 
     /* 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;
         reiserfs_cond_resched(sb);
     }
 
     /*
      * 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 */
     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)) {
         depth = reiserfs_write_unlock_nested(sb);
         write_ordered_buffers(&journal->j_dirty_buffers_lock,
                       journal, jl, &jl->j_tail_bh_list);
         reiserfs_write_lock_nested(sb, depth);
     }
     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)) {
         /*
          * Avoid queueing work when sb is being shut down. Transaction
          * will be flushed on journal shutdown.
          */
         if (sb->s_flags & SB_ACTIVE)
             queue_delayed_work(REISERFS_SB(sb)->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;
             }
         }
     }
 
     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 |= SB_RDONLY;
     set_bit(J_ABORTED, &journal->j_state);
 
 #ifdef CONFIG_REISERFS_CHECK
     dump_stack();
 #endif
 }