linux-kernel - [PATCH] ceph: Don't use ceph-sync-mode for synchronous-fs.

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Date:	Thu, 27 Jun 2013 15:56:06 +0800
From:	majianpeng <majianpeng@...il.com>
To:	sage <sage@...tank.com>
Cc:	ceph-devel <ceph-devel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] ceph: Don't use ceph-sync-mode for synchronous-fs.

At now for synchronous-fs, all write-operations use ceph_sync_mode.
But for the file which opened with O_SYNC, it don't use sync_mode.
The behaviour of them should be the same.
For fs which mounted using '-o sync', it want all I/O to the filesystem
should be done synchronously.But the ceph-sync-mode don't be suitful
for.For example,using ceph-sync-mode the content of file don't have in
memory.This will cause the following read only from osd rather than
memory.

Signed-off-by: Jianpeng Ma <majianpeng@...il.com>
---
 fs/ceph/file.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 656e169..44670ad 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -659,7 +659,6 @@ again:
 
 	if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
 	    (iocb->ki_filp->f_flags & O_DIRECT) ||
-	    (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
 	    (fi->flags & CEPH_F_SYNC))
 		/* hmm, this isn't really async... */
 		ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
@@ -764,7 +763,6 @@ retry_snap:
 
 	if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
 	    (iocb->ki_filp->f_flags & O_DIRECT) ||
-	    (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
 	    (fi->flags & CEPH_F_SYNC)) {
 		mutex_unlock(&inode->i_mutex);
 		written = ceph_sync_write(file, iov->iov_base, count,
-- 
1.8.1.2