This is a note to let you know that I've just added the patch titled
NFS: Fix a race between mmap() and O_DIRECT
to the 4.14-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-fix-a-race-between-mmap-and-o_direct.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e231c6879cfd44e4fffd384bb6dd7d313249a523 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Date: Sun, 28 Jan 2018 09:29:41 -0500
Subject: NFS: Fix a race between mmap() and O_DIRECT
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
commit e231c6879cfd44e4fffd384bb6dd7d313249a523 upstream.
When locking the file in order to do O_DIRECT on it, we must unmap
any mmapped ranges on the pagecache so that we can flush out the
dirty data.
Fixes: a5864c999de67 ("NFS: Do not serialise O_DIRECT reads and writes")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/io.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/nfs/io.c
+++ b/fs/nfs/io.c
@@ -99,7 +99,7 @@ static void nfs_block_buffered(struct nf
{
if (!test_bit(NFS_INO_ODIRECT, &nfsi->flags)) {
set_bit(NFS_INO_ODIRECT, &nfsi->flags);
- nfs_wb_all(inode);
+ nfs_sync_mapping(inode->i_mapping);
}
}
Patches currently in stable-queue which might be from trond.myklebust@xxxxxxxxxxxxxxx are
queue-4.14/nfs-pnfs-fix-nfs_direct_req-ref-leak-when-i-o-falls-back-to-the-mds.patch
queue-4.14/nfs-fix-nfsstat-breakage-due-to-lookupp.patch
queue-4.14/nfs-add-a-cond_resched-to-nfs_commit_release_pages.patch
queue-4.14/nfs41-do-not-return-enomem-on-layoutunavailable.patch
queue-4.14/nfs-commit-direct-writes-even-if-they-fail-partially.patch
queue-4.14/nfs-fix-a-race-between-mmap-and-o_direct.patch