[PATCH 5/5] fuse: Remove page flush/invaliation in fuse_direct_io

[Bernd Schubert <bschubert@ddn.com>]

Page flush and invalidation in fuse_direct_io can when FOPEN_DIRECT_IO
is set can be removed, as the code path is now always via
generic_file_direct_write, which already does it.

Cc: Hao Xu <howeyxu@tencent.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Dharmendra Singh <dsingh@ddn.com>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Bernd Schubert <bschubert@ddn.com>
---
 fs/fuse/file.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 09277a54b711..eab105ef4640 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1473,20 +1473,11 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
 	int err = 0;
 	struct fuse_io_args *ia;
 	unsigned int max_pages;
-	bool fopen_direct_io = ff->open_flags & FOPEN_DIRECT_IO;
-
 	max_pages = iov_iter_npages(iter, fc->max_pages);
 	ia = fuse_io_alloc(io, max_pages);
 	if (!ia)
 		return -ENOMEM;
 
-	if (fopen_direct_io && fc->direct_io_relax) {
-		res = filemap_write_and_wait_range(mapping, pos, pos + count - 1);
-		if (res) {
-			fuse_io_free(ia);
-			return res;
-		}
-	}
 	if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) {
 		if (!write)
 			inode_lock(inode);
@@ -1495,14 +1486,6 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
 			inode_unlock(inode);
 	}
 
-	if (fopen_direct_io && write) {
-		res = invalidate_inode_pages2_range(mapping, idx_from, idx_to);
-		if (res) {
-			fuse_io_free(ia);
-			return res;
-		}
-	}
-
 	io->should_dirty = !write && user_backed_iter(iter);
 	while (count) {
 		ssize_t nres;
-- 
2.39.2