[PATCH] ext3: Add "-o bh" option

This patch adds "-o bh" option to force use of buffer_heads.  This option
is needed when we make "nobh" as default - and if we run into problems.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/filesystems/ext3.txt b/Documentation/filesystems/ext3.txt
index afb1335c05d6..4aecc9bdb273 100644
--- a/Documentation/filesystems/ext3.txt
+++ b/Documentation/filesystems/ext3.txt
@@ -113,6 +113,14 @@ noquota
 grpquota
 usrquota
 
+bh              (*)     ext3 associates buffer heads to data pages to
+nobh                    (a) cache disk block mapping information
+                        (b) link pages into transaction to provide
+                            ordering guarantees.
+                        "bh" option forces use of buffer heads.
+                        "nobh" option tries to avoid associating buffer
+                        heads (supported only for "writeback" mode).
+
 
 Specification
 =============