On Wed 02-11-16 07:27:46, Christoph Hellwig wrote:
> On Tue, Nov 01, 2016 at 10:06:12PM +0100, Jan Kara wrote:
> > Currently we don't allow unaligned writes without inode_lock. This is
> > because zeroing of partial blocks could cause data corruption for racing
> > unaligned writes to the same block. However DAX handles zeroing during
> > block allocation and thus zeroing of partial blocks cannot race. Allow
> > DAX unaligned IO to run without inode_lock.
>
> DAX writes should always take the inode lock. Without that you break
> the expectations of existing applications that did not specify O_DIRECT.
Yeah, actually this patch has no practical effect since later iomap
conversion just effectively reverts this patch and I didn't realize it.
I'll just drop it. Thanks.
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR
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