Patch "NFS: Fix a potential data corruption" has been added to the 6.1-stable tree

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

    NFS: Fix a potential data corruption

to the 6.1-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-potential-data-corruption.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 88975a55969e11f26fe3846bf4fbf8e7dc8cbbd4 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Date: Sat, 19 Aug 2023 17:22:14 -0400
Subject: NFS: Fix a potential data corruption

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

commit 88975a55969e11f26fe3846bf4fbf8e7dc8cbbd4 upstream.

We must ensure that the subrequests are joined back into the head before
we can retransmit a request. If the head was not on the commit lists,
because the server wrote it synchronously, we still need to add it back
to the retransmission list.
Add a call that mirrors the effect of nfs_cancel_remove_inode() for
O_DIRECT.

Fixes: ed5d588fe47f ("NFS: Try to join page groups before an O_DIRECT retransmission")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nfs/direct.c |   20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -474,13 +474,31 @@ out:
 	return result;
 }
 
+static void nfs_direct_add_page_head(struct list_head *list,
+				     struct nfs_page *req)
+{
+	struct nfs_page *head = req->wb_head;
+
+	if (!list_empty(&head->wb_list) || !nfs_lock_request(head))
+		return;
+	if (!list_empty(&head->wb_list)) {
+		nfs_unlock_request(head);
+		return;
+	}
+	list_add(&head->wb_list, list);
+	kref_get(&head->wb_kref);
+	kref_get(&head->wb_kref);
+}
+
 static void nfs_direct_join_group(struct list_head *list, struct inode *inode)
 {
 	struct nfs_page *req, *subreq;
 
 	list_for_each_entry(req, list, wb_list) {
-		if (req->wb_head != req)
+		if (req->wb_head != req) {
+			nfs_direct_add_page_head(&req->wb_list, req);
 			continue;
+		}
 		subreq = req->wb_this_page;
 		if (subreq == req)
 			continue;


Patches currently in stable-queue which might be from trond.myklebust@xxxxxxxxxxxxxxx are

queue-6.1/nfs-fix-a-potential-data-corruption.patch



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