jbd2: Add BH_JBDPrivateStart

(cherry picked from commit e97fcd95a4778a8caf1980c6c72fdf68185a0838)

Add this so that file systems using JBD2 can safely allocate unused b_state
bits.

In this case, we add it so that Ocfs2 can define a single bit for tracking
the validation state of a buffer.

Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index c7d106ef22e2f535f2c78f470a300b5fb7e8b930..f36645745489313cc09e21edfdc7f6d11bfde9a8 100644 (file)
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -329,6 +329,7 @@ enum jbd_state_bits {
        BH_State,               /* Pins most journal_head state */
        BH_JournalHead,         /* Pins bh->b_private and jh->b_bh */
        BH_Unshadow,            /* Dummy bit, for BJ_Shadow wakeup filtering */
+       BH_JBDPrivateStart,     /* First bit available for private use by FS */
 };
 
 BUFFER_FNS(JBD, jbd)