From: Jan Kara <jack@suse.cz>
To: linux-ext4@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, Dave Chinner <david@fromorbit.com>,
Jan Kara <jack@suse.cz>, Ted Tso <tytso@mit.edu>,
linux-nvdimm@lists.01.org
Subject: [PATCH 02/11] ext4: Allow unaligned unlocked DAX IO
Date: Tue, 1 Nov 2016 22:06:12 +0100 [thread overview]
Message-ID: <1478034381-19037-3-git-send-email-jack@suse.cz> (raw)
In-Reply-To: <1478034381-19037-1-git-send-email-jack@suse.cz>
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.
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/ext4/file.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index a6a7becb9465..55f8b922b76d 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -161,7 +161,8 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
iocb->private = &overwrite;
/* Check whether we do a DIO overwrite or not */
- if (o_direct && ext4_should_dioread_nolock(inode) && !unaligned_aio &&
+ if (((o_direct && !unaligned_aio) || IS_DAX(inode)) &&
+ ext4_should_dioread_nolock(inode) &&
ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from)))
overwrite = 1;
--
2.6.6
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next prev parent reply other threads:[~2016-11-01 21:22 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-01 21:06 [PATCH 0/11] ext4: Convert ext4 DAX IO to iomap framework Jan Kara
2016-11-01 21:06 ` [PATCH 01/11] ext4: Factor out checks from ext4_file_write_iter() Jan Kara
2016-11-03 21:04 ` Ross Zwisler
2016-11-04 4:20 ` Jan Kara
2016-11-01 21:06 ` Jan Kara [this message]
[not found] ` <1478034381-19037-3-git-send-email-jack-AlSwsSmVLrQ@public.gmane.org>
2016-11-02 14:27 ` [PATCH 02/11] ext4: Allow unaligned unlocked DAX IO Christoph Hellwig
2016-11-03 23:55 ` Jan Kara
2016-11-01 21:06 ` [PATCH 03/11] ext4: Let S_DAX set only if DAX is really supported Jan Kara
2016-11-01 21:06 ` [PATCH 04/11] ext4: Convert DAX reads to iomap infrastructure Jan Kara
2016-11-01 21:06 ` [PATCH 05/11] ext4: Use iomap for zeroing blocks in DAX mode Jan Kara
2016-11-01 21:06 ` [PATCH 06/11] ext4: DAX iomap write support Jan Kara
2016-11-01 21:06 ` [PATCH 07/11] ext4: Avoid split extents for DAX writes Jan Kara
2016-11-01 21:06 ` [PATCH 08/11] ext4: Convert DAX faults to iomap infrastructure Jan Kara
2016-11-02 14:30 ` Christoph Hellwig
[not found] ` <20161102143006.GB18387-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-11-04 0:02 ` Jan Kara
2016-11-01 21:06 ` [PATCH 09/11] ext4: Rip out DAX handling from direct IO path Jan Kara
2016-11-01 21:06 ` [PATCH 10/11] ext2: Use iomap_zero_range() for zeroing truncated page in DAX path Jan Kara
2016-11-01 21:06 ` [PATCH 11/11] dax: Rip out get_block based IO support Jan Kara
[not found] ` <1478034381-19037-12-git-send-email-jack-AlSwsSmVLrQ@public.gmane.org>
2016-11-02 14:31 ` Christoph Hellwig
2016-11-04 0:03 ` Jan Kara
2016-11-01 22:12 ` [PATCH 0/11] ext4: Convert ext4 DAX IO to iomap framework Dave Chinner
2016-11-01 22:45 ` Ross Zwisler
2016-11-01 23:09 ` Jan Kara
2016-11-02 13:03 ` Theodore Ts'o
2016-11-02 22:23 ` Dave Chinner
[not found] ` <20161102130353.nt3oqodrik4hnfk6-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2016-11-04 0:55 ` Jan Kara
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