[2.6 patch] fs/jbd/: possible cleanups

[Adrian Bunk <bunk@stusta.de>]

This patch contains the following possible cleanups:
- make needlessly global functions static
- journal.c: remove the unused global function __journal_internal_check
             and move the check to journal_init
- remove the following write-only global variable:
  - journal.c: current_journal
- remove the following unneeded EXPORT_SYMBOL's:
  - journal.c: journal_check_used_features
  - journal.c: journal_recover

Please check which of these changes do make sense.

Signed-off-by: Adrian Bunk <bunk@stusta.de>

---

 fs/jbd/journal.c    |   41 ++++++++++++++++++-----------------------
 fs/jbd/revoke.c     |    3 ++-
 include/linux/jbd.h |    3 ---
 3 files changed, 20 insertions(+), 27 deletions(-)

--- linux-2.6.12-rc6-mm1-full/include/linux/jbd.h.old	2005-06-14 03:58:20.000000000 +0200
+++ linux-2.6.12-rc6-mm1-full/include/linux/jbd.h	2005-06-14 04:00:56.000000000 +0200
@@ -900,8 +900,6 @@
 				int start, int len, int bsize);
 extern journal_t * journal_init_inode (struct inode *);
 extern int	   journal_update_format (journal_t *);
-extern int	   journal_check_used_features 
-		   (journal_t *, unsigned long, unsigned long, unsigned long);
 extern int	   journal_check_available_features 
 		   (journal_t *, unsigned long, unsigned long, unsigned long);
 extern int	   journal_set_features 
@@ -914,7 +912,6 @@
 extern int	   journal_skip_recovery	(journal_t *);
 extern void	   journal_update_superblock	(journal_t *, int);
 extern void	   __journal_abort_hard	(journal_t *);
-extern void	   __journal_abort_soft	(journal_t *, int);
 extern void	   journal_abort      (journal_t *, int);
 extern int	   journal_errno      (journal_t *);
 extern void	   journal_ack_err    (journal_t *);
--- linux-2.6.12-rc6-mm1-full/fs/jbd/journal.c.old	2005-06-14 03:57:39.000000000 +0200
+++ linux-2.6.12-rc6-mm1-full/fs/jbd/journal.c	2005-06-14 04:08:24.000000000 +0200
@@ -59,13 +59,11 @@
 EXPORT_SYMBOL(journal_init_dev);
 EXPORT_SYMBOL(journal_init_inode);
 EXPORT_SYMBOL(journal_update_format);
-EXPORT_SYMBOL(journal_check_used_features);
 EXPORT_SYMBOL(journal_check_available_features);
 EXPORT_SYMBOL(journal_set_features);
 EXPORT_SYMBOL(journal_create);
 EXPORT_SYMBOL(journal_load);
 EXPORT_SYMBOL(journal_destroy);
-EXPORT_SYMBOL(journal_recover);
 EXPORT_SYMBOL(journal_update_superblock);
 EXPORT_SYMBOL(journal_abort);
 EXPORT_SYMBOL(journal_errno);
@@ -81,6 +79,7 @@
 EXPORT_SYMBOL(journal_force_commit);
 
 static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *);
+static void __journal_abort_soft (journal_t *journal, int errno);
 
 /*
  * Helper function used to manage commit timeouts
@@ -93,16 +92,6 @@
 	wake_up_process(p);
 }
 
-/* Static check for data structure consistency.  There's no code
- * invoked --- we'll just get a linker failure if things aren't right.
- */
-void __journal_internal_check(void)
-{
-	extern void journal_bad_superblock_size(void);
-	if (sizeof(struct journal_superblock_s) != 1024)
-		journal_bad_superblock_size();
-}
-
 /*
  * kjournald: The main thread function used to manage a logging device
  * journal.
@@ -119,16 +108,12 @@
  *    known as checkpointing, and this thread is responsible for that job.
  */
 
-journal_t *current_journal;		// AKPM: debug
-
-int kjournald(void *arg)
+static int kjournald(void *arg)
 {
 	journal_t *journal = (journal_t *) arg;
 	transaction_t *transaction;
 	struct timer_list timer;
 
-	current_journal = journal;
-
 	daemonize("kjournald");
 
 	/* Set up an interval timer which can be used to trigger a
@@ -1181,8 +1166,10 @@
  * features.  Return true (non-zero) if it does. 
  **/
 
-int journal_check_used_features (journal_t *journal, unsigned long compat,
-				 unsigned long ro, unsigned long incompat)
+static int journal_check_used_features (journal_t *journal,
+					unsigned long compat,
+					unsigned long ro,
+					unsigned long incompat)
 {
 	journal_superblock_t *sb;
 
@@ -1439,7 +1426,7 @@
  * device this journal is present.
  */
 
-const char *journal_dev_name(journal_t *journal, char *buffer)
+static const char *journal_dev_name(journal_t *journal, char *buffer)
 {
 	struct block_device *bdev;
 
@@ -1485,7 +1472,7 @@
 
 /* Soft abort: record the abort error status in the journal superblock,
  * but don't do any other IO. */
-void __journal_abort_soft (journal_t *journal, int errno)
+static void __journal_abort_soft (journal_t *journal, int errno)
 {
 	if (journal->j_flags & JFS_ABORT)
 		return;
@@ -1888,7 +1875,7 @@
 
 static struct proc_dir_entry *proc_jbd_debug;
 
-int read_jbd_debug(char *page, char **start, off_t off,
+static int read_jbd_debug(char *page, char **start, off_t off,
 			  int count, int *eof, void *data)
 {
 	int ret;
@@ -1898,7 +1885,7 @@
 	return ret;
 }
 
-int write_jbd_debug(struct file *file, const char __user *buffer,
+static int write_jbd_debug(struct file *file, const char __user *buffer,
 			   unsigned long count, void *data)
 {
 	char buf[32];
@@ -1987,6 +1974,14 @@
 {
 	int ret;
 
+/* Static check for data structure consistency.  There's no code
+ * invoked --- we'll just get a linker failure if things aren't right.
+ */
+	extern void journal_bad_superblock_size(void);
+	if (sizeof(struct journal_superblock_s) != 1024)
+		journal_bad_superblock_size();
+
+
 	ret = journal_init_caches();
 	if (ret != 0)
 		journal_destroy_caches();
--- linux-2.6.12-rc6-mm1-full/fs/jbd/revoke.c.old	2005-06-14 03:58:36.000000000 +0200
+++ linux-2.6.12-rc6-mm1-full/fs/jbd/revoke.c	2005-06-14 03:58:41.000000000 +0200
@@ -116,7 +116,8 @@
 		(block << (hash_shift - 12))) & (table->hash_size - 1);
 }
 
-int insert_revoke_hash(journal_t *journal, unsigned long blocknr, tid_t seq)
+static int insert_revoke_hash(journal_t *journal, unsigned long blocknr,
+			      tid_t seq)
 {
 	struct list_head *hash_list;
 	struct jbd_revoke_record_s *record;