Commit b5a2a3a0 authored by Hao Xu's avatar Hao Xu Committed by Miklos Szeredi
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fuse: write back dirty pages before direct write in direct_io_relax mode 



In direct_io_relax mode, there can be shared mmaped files and thus dirty
pages in its page cache.  Therefore those dirty pages should be written
back to backend before direct io to avoid data loss.

Signed-off-by: default avatarHao Xu <howeyxu@tencent.com>
Reviewed-by: default avatarJiachen Zhang <zhangjiachen.jaycee@bytedance.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent e78662e8

fs/fuse/file.c

+7 −0
Original line number Diff line number Diff line
@@ -1448,6 +1448,13 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, 
	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);