jbd2: clean up how the journal device name is printed

Calculate the journal device name once and stash it away in the
journal_s structure.  This avoids needing to call bdevname()
everywhere and reduces stack usage by not needing to allocate an
on-stack buffer.  In addition, we eliminate the '/' that can appear in
device names (e.g. "cciss/c0d0p9" --- see kernel bugzilla #11321) that
can cause problems when creating proc directory names, and include the
inode number to support ocfs2 which creates multiple journals with
different inode numbers.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 3dd209007098..66c3499478b5 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -850,7 +850,8 @@ struct journal_s
          */
         struct block_device     *j_dev;
         int                     j_blocksize;
-        unsigned long long              j_blk_offset;
+        unsigned long long      j_blk_offset;
+        char                    j_devname[BDEVNAME_SIZE+24];
 
         /*
          * Device which holds the client fs.  For internal journal this will be