This is a note to let you know that I've just added the patch titled

NFS: commit direct writes even if they fail partially

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: nfs-commit-direct-writes-even-if-they-fail-partially.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 1b8d97b0a837beaf48a8449955b52c650a7114b4 Mon Sep 17 00:00:00 2001

From: "J. Bruce Fields" bfields@redhat.com Date: Tue, 16 Jan 2018 10:08:00 -0500 Subject: NFS: commit direct writes even if they fail partially

From: J. Bruce Fields bfields@redhat.com

commit 1b8d97b0a837beaf48a8449955b52c650a7114b4 upstream.

If some of the WRITE calls making up an O_DIRECT write syscall fail, we neglect to commit, even if some of the WRITEs succeed.

We also depend on the commit code to free the reference count on the nfs_page taken in the "if (request_commit)" case at the end of nfs_direct_write_completion(). The problem was originally noticed because ENOSPC's encountered partway through a write would result in a closed file being sillyrenamed when it should have been unlinked.

Signed-off-by: J. Bruce Fields bfields@redhat.com Signed-off-by: Trond Myklebust trond.myklebust@primarydata.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- fs/nfs/direct.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -787,10 +787,8 @@ static void nfs_direct_write_completion(

spin_lock(&dreq->lock);

- if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) { - dreq->flags = 0; + if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) dreq->error = hdr->error; - } if (dreq->error == 0) { nfs_direct_good_bytes(dreq, hdr); if (nfs_write_need_commit(hdr)) {

Patches currently in stable-queue which might be from bfields@redhat.com are

queue-4.9/nfs-commit-direct-writes-even-if-they-fail-partially.patch