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ocfs2: do not fallback to buffer I/O write if appending

PATCH New Joseph Qi 1 participant 1 message Jan 20, 2015 OCFS2

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Joseph Qi

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PATCH v6 6/9 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 Joseph Qi <[email protected]>
Cc Weiwei Wang <[email protected]>
---
 fs/ocfs2/file.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
fs/ocfs2/file.c +4 -1
index d0ed2c1..c1446cf 100644
@@ -2116,6 +2116,9 @@ 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

@@ -2204,7 +2207,7 @@ 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;
 		}
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1.8.4.3