From be7e985804c610fcdcee8730cf42718b8a4e1c41 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 12 Dec 2012 12:36:31 -0500 Subject: [PATCH] nfs: fix page dirtying in NFS DIO read codepath The NFS DIO code will dirty pages that catch read responses in order to handle the case where someone is doing DIO reads into an mmapped buffer. The existing code doesn't really do the right thing though since it doesn't take into account the case where we might be attempting to read past the EOF. Fix the logic in that code to only dirty pages that ended up receiving data from the read. Note too that it really doesn't matter if NFS_IOHDR_ERROR is set or not. All that matters is if the page was altered by the read. Cc: Fred Isaman Signed-off-by: Jeff Layton Signed-off-by: Trond Myklebust --- fs/nfs/direct.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 594f4e7e0b9a..0bd7a55a5f07 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -266,13 +266,8 @@ static void nfs_direct_read_completion(struct nfs_pgio_header *hdr) struct nfs_page *req = nfs_list_entry(hdr->pages.next); struct page *page = req->wb_page; - if (!PageCompound(page)) { - if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) { - if (bytes < hdr->good_bytes) - set_page_dirty(page); - } else - set_page_dirty(page); - } + if (!PageCompound(page) && bytes < hdr->good_bytes) + set_page_dirty(page); bytes += req->wb_bytes; nfs_list_remove_request(req); nfs_direct_readpage_release(req);