reiserfs: convert j_flush_sem to mutex

j_flush_sem is a semaphore but uses it as if it were a mutex.  This patch
converts it to a mutex.

[akpm@linux-foundation.org: fix mutex_trylock retval treatment]
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Edward Shishkin <edward.shishkin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 8 insertions, 8 deletions

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 0f7b1e807e60..3cb4a562030e 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -1411,8 +1411,8 @@ static int flush_journal_list(struct super_block *s,
 
         /* if flushall == 0, the lock is already held */
         if (flushall) {
-                down(&journal->j_flush_sem);
-        } else if (!down_trylock(&journal->j_flush_sem)) {
+                mutex_lock(&journal->j_flush_mutex);
+        } else if (mutex_trylock(&journal->j_flush_mutex)) {
                 BUG();
         }
 
@@ -1642,7 +1642,7 @@ static int flush_journal_list(struct super_block *s,
         jl->j_state = 0;
         put_journal_list(s, jl);
         if (flushall)
-                up(&journal->j_flush_sem);
+                mutex_unlock(&journal->j_flush_mutex);
         put_fs_excl();
         return err;
 }
@@ -1772,12 +1772,12 @@ static int kupdate_transactions(struct super_block *s,
         struct reiserfs_journal *journal = SB_JOURNAL(s);
         chunk.nr = 0;
 
-        down(&journal->j_flush_sem);
+        mutex_lock(&journal->j_flush_mutex);
         if (!journal_list_still_alive(s, orig_trans_id)) {
                 goto done;
         }
 
-        /* we've got j_flush_sem held, nobody is going to delete any
+        /* 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) ||
@@ -1812,7 +1812,7 @@ static int kupdate_transactions(struct super_block *s,
         }
 
       done:
-        up(&journal->j_flush_sem);
+        mutex_unlock(&journal->j_flush_mutex);
         return ret;
 }
 
@@ -2838,7 +2838,7 @@ int journal_init(struct super_block *p_s_sb, const char *j_dev_name,
         journal->j_first = NULL;
         init_waitqueue_head(&(journal->j_join_wait));
         mutex_init(&journal->j_mutex);
-        sema_init(&journal->j_flush_sem, 1);
+        mutex_init(&journal->j_flush_mutex);
 
         journal->j_trans_id = 10;
         journal->j_mount_id = 10;
diff --git a/include/linux/reiserfs_fs_sb.h b/include/linux/reiserfs_fs_sb.h
index 49b639b88bac..c0751724ee64 100644
--- a/include/linux/reiserfs_fs_sb.h
+++ b/include/linux/reiserfs_fs_sb.h
@@ -194,7 +194,7 @@ struct reiserfs_journal {
 
         time_t j_trans_start_time;      /* time this transaction started */
         struct mutex j_mutex;
-        struct semaphore j_flush_sem;
+        struct mutex j_flush_mutex;
         wait_queue_head_t j_join_wait;  /* wait for current transaction to finish before starting new one */
         atomic_t j_jlock;       /* lock for j_join_wait */
         int j_list_bitmap_index;        /* number of next list bitmap to use */