linux-kernel - [PATCH 5/9] btrfs: Use generic handlers of O

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Message-ID: <20121120075114.25270.85716.stgit@blackbox.djwong.org>
Date:	Mon, 19 Nov 2012 23:51:14 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	axboe@...nel.dk, tytso@....edu, david@...morbit.com,
	jmoyer@...hat.com, bpm@....com, viro@...iv.linux.org.uk,
	jack@...e.cz
Cc:	linux-fsdevel@...r.kernel.org, hch@...radead.org,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com
Subject: [PATCH 5/9] btrfs: Use generic handlers of O_SYNC AIO DIO

Use generic handlers to queue fsync() when AIO DIO is completed for O_SYNC
file. Although we use our own bio->end_io function, we call dio_end_io()
from it and thus, because we don't set any specific dio->end_io function,
generic code ends up calling generic_dio_end_io() which is all what we need
for proper O_SYNC AIO DIO handling.

From: Jan Kara <jack@...e.cz>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Jeff Moyer <jmoyer@...hat.com>
[darrick.wong@...cle.com: Don't issue flush if aio is queued]
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/btrfs/file.c  |    2 +-
 fs/btrfs/inode.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)


diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 9ab1bed..37b5bb3 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1495,7 +1495,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
 	 * one running right now.
 	 */
 	BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
-	if (num_written > 0 || num_written == -EIOCBQUEUED) {
+	if (num_written > 0) {
 		err = generic_write_sync(file, pos, num_written);
 		if (err < 0 && num_written > 0)
 			num_written = err;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 95542a1..c8b6049 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6579,7 +6579,7 @@ static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
 	return __blockdev_direct_IO(rw, iocb, inode,
 		   BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev,
 		   iov, offset, nr_segs, btrfs_get_blocks_direct, NULL,
-		   btrfs_submit_direct, 0);
+		   btrfs_submit_direct, DIO_SYNC_WRITES);
 }
 
 static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,


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