On Thu, Jul 02, 2009 at 12:01:30AM +0530, Aneesh Kumar K.V wrote:
>
> I looked at the patch in detail and I guess we should instead force
> a data=writeback mode if the filesystem is created without a journal.
> I am not sure what whould be the meaning of data=ordered/data=journal
> without a journal. So if we find that file system doesn't have a journal
> then either we should update the default mount option in the filesystem
> to be of data=writeback.
Here's a patch which takes your approach to solving the problem. What
do you think?
I haven't messed with dealing with the data= mount options in
fs/ext4/super.c. That's important from a UI point of view, but we
needed to fix ext4_jbd2.h since it was unconditionally returning 0 if
there was no journal for all of the ext4_should_*_data() functions.
I believe this should DTRT with the -o nobh mount option, but I'd
appreciate another pair of eyes taking a look at this.
- Ted
commit 2a73eff8ba80095a871a6b402dfd24bc454e5bdc
Author: Theodore Ts'o <tytso@xxxxxxx>
Date: Sun Jul 5 23:37:13 2009 -0400
ext4: fix no journal corruption with locale-gen
If there is no journal, ext4_should_writeback_data() should return
TRUE. This will fix ext4_set_aops() to set ext4_da_ops in the case of
delayed allocation; otherwise ext4_journaled_aops gets used by
default, which doesn't handle delayed allocation properly.
The advantage of using ext4_should_writeback_data() approach is that
it should handle nobh better as well.
Thanks to Curt Wohlgemuth for investigating this problem, and Aneesh
Kumar for suggesting this approach.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index be2f426..f800134 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -282,7 +282,7 @@ static inline int ext4_should_order_data(struct inode *inode)
static inline int ext4_should_writeback_data(struct inode *inode)
{
if (EXT4_JOURNAL(inode) == NULL)
- return 0;
+ return 1;
if (!S_ISREG(inode->i_mode))
return 0;
if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
--
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