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 a52a5d2..7e7ba9a 100644 (file)
--- 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,