Convert /proc/device-tree/ to seq_file

[safe/jmp/linux-2.6] / fs / ext4 / ext4_jbd2.h

diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index d574a85..a286598 100644 (file)
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -131,9 +131,11 @@ int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
 int __ext4_journal_get_write_access(const char *where, handle_t *handle,
                                struct buffer_head *bh);
 
+/* When called with an invalid handle, this will still do a put on the BH */
 int __ext4_journal_forget(const char *where, handle_t *handle,
                                struct buffer_head *bh);
 
+/* When called with an invalid handle, this will still do a put on the BH */
 int __ext4_journal_revoke(const char *where, handle_t *handle,
                                ext4_fsblk_t blocknr, struct buffer_head *bh);
 
@@ -159,11 +161,13 @@ int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
 int __ext4_journal_stop(const char *where, handle_t *handle);
 
-#define EXT4_NOJOURNAL_HANDLE  ((handle_t *) 0x1)
+#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
 
+/* Note:  Do not use this for NULL handles.  This is only to determine if
+ * a properly allocated handle is using a journal or not. */
 static inline int ext4_handle_valid(handle_t *handle)
 {
-       if (handle == EXT4_NOJOURNAL_HANDLE)
+       if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
                return 0;
        return 1;
 }