From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f49.google.com (mail-pa0-f49.google.com [209.85.220.49]) by kanga.kvack.org (Postfix) with ESMTP id 13B576B0070 for ; Fri, 19 Dec 2014 22:18:50 -0500 (EST) Received: by mail-pa0-f49.google.com with SMTP id eu11so2349372pac.36 for ; Fri, 19 Dec 2014 19:18:49 -0800 (PST) Received: from mail-pd0-f176.google.com (mail-pd0-f176.google.com. [209.85.192.176]) by mx.google.com with ESMTPS id lg2si16528542pab.114.2014.12.19.19.18.47 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 19 Dec 2014 19:18:47 -0800 (PST) Received: by mail-pd0-f176.google.com with SMTP id r10so2352112pdi.7 for ; Fri, 19 Dec 2014 19:18:47 -0800 (PST) From: Omar Sandoval Subject: [PATCH v2 3/5] nfs: don't dirty ITER_BVEC pages read through direct I/O Date: Fri, 19 Dec 2014 19:18:27 -0800 Message-Id: In-Reply-To: References: In-Reply-To: References: Sender: owner-linux-mm@kvack.org List-ID: To: Alexander Viro , Andrew Morton , Trond Myklebust , Christoph Hellwig , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Omar Sandoval As with the generic blockdev code, kernel pages shouldn't be dirtied by the direct I/O path. Signed-off-by: Omar Sandoval --- fs/nfs/direct.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 10bf072..b6ca65c 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -88,6 +88,7 @@ struct nfs_direct_req { struct pnfs_ds_commit_info ds_cinfo; /* Storage for cinfo */ struct work_struct work; int flags; + int should_dirty; /* should we mark read pages dirty? */ #define NFS_ODIRECT_DO_COMMIT (1) /* an unstable reply was received */ #define NFS_ODIRECT_RESCHED_WRITES (2) /* write verification failed */ struct nfs_writeverf verf; /* unstable write verifier */ @@ -370,7 +371,8 @@ 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) && bytes < hdr->good_bytes) + if (!PageCompound(page) && bytes < hdr->good_bytes && + dreq->should_dirty) set_page_dirty(page); bytes += req->wb_bytes; nfs_list_remove_request(req); @@ -542,6 +544,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter, dreq->inode = inode; dreq->bytes_left = count; dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp)); + dreq->should_dirty = !iov_iter_is_bvec(iter); l_ctx = nfs_get_lock_context(dreq->ctx); if (IS_ERR(l_ctx)) { result = PTR_ERR(l_ctx); -- 2.2.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org