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 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfs-commit-direct-writes-even-if-they-fail-partially.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1b8d97b0a837beaf48a8449955b52c650a7114b4 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
Date: Tue, 16 Jan 2018 10:08:00 -0500
Subject: NFS: commit direct writes even if they fail partially
From: J. Bruce Fields <bfields@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/direct.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -775,10 +775,8 @@ 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@xxxxxxxxxx are
queue-4.15/nfsd-detect-unhashed-stids-in-nfsd4_verify_open_stid.patch
queue-4.15/nfs-commit-direct-writes-even-if-they-fail-partially.patch