WeiWei Wang
2014-Oct-11 12:31 UTC
[Ocfs2-devel] [PATCH 6/7 v4] ocfs2: do not fallback to buffer I/O write if appending
Now we can do direct io and do not fallback to buffered IO any more
in case of append O_DIRECT write.
Signed-off-by: Weiwei Wang <wangww631 at huawei.com>
Reviewed-by: Joseph Qi <joseph.qi at huawei.com>
---
fs/ocfs2/file.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 964d442..19e372f 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2110,6 +2110,9 @@ static int ocfs2_prepare_inode_for_write(struct file
*file,
struct dentry *dentry = file->f_path.dentry;
struct inode *inode = dentry->d_inode;
loff_t saved_pos = 0, end;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ int full_coherency = !(osb->s_mount_opt &
+ OCFS2_MOUNT_COHERENCY_BUFFERED);
/*
* We start with a read level meta lock and only jump to an ex
@@ -2198,7 +2201,7 @@ static int ocfs2_prepare_inode_for_write(struct file
*file,
* one node could wind up truncating another
* nodes writes.
*/
- if (end > i_size_read(inode)) {
+ if (end > i_size_read(inode) && !full_coherency) {
*direct_io = 0;
break;
}
--
1.8.4.3