From: Boaz Harrosh <bharrosh@panasas.com>
Date: Mon, 13 Jan 2014 21:45:43 +0000 (+0200)
Subject: exofs: Allow O_DIRECT open
X-Git-Tag: firefly_0821_release~176^2~4548^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d83c7eb65d9bf0a57e7d5ed87a5bd8e5ea6b1fb6;p=firefly-linux-kernel-4.4.55.git

exofs: Allow O_DIRECT open

With this minimal do nothing patch an application can open O_DIRECT
and then actually do buffered sync IO instead. But the aio API is
supported which is a good thing

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---

diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index a52a5d23c30b..7e7ba9ada405 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -961,6 +961,14 @@ static void exofs_invalidatepage(struct page *page, unsigned int offset,
 	WARN_ON(1);
 }
 
+
+ /* TODO: Should be easy enough to do proprly */
+static ssize_t exofs_direct_IO(int rw, struct kiocb *iocb,
+		const struct iovec *iov, loff_t offset, unsigned long nr_segs)
+{
+	return 0;
+}
+
 const struct address_space_operations exofs_aops = {
 	.readpage	= exofs_readpage,
 	.readpages	= exofs_readpages,
@@ -974,7 +982,7 @@ const struct address_space_operations exofs_aops = {
 
 	/* Not implemented Yet */
 	.bmap		= NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
-	.direct_IO	= NULL, /* TODO: Should be trivial to do */
+	.direct_IO	= exofs_direct_IO,
 
 	/* With these NULL has special meaning or default is not exported */
 	.get_xip_mem	= NULL,