From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Fri, 5 Sep 2025 16:11:17 +0000 (-0400)
Subject: NFSv4.2: Serialise O_DIRECT i/o and fallocate()
X-Git-Tag: v6.17-rc6~23^2~7
X-Git-Url: https://gentwo.org/gitweb/?a=commitdiff_plain;h=b93128f29733af5d427a335978a19884c2c230e2;p=linux%2F.git

NFSv4.2: Serialise O_DIRECT i/o and fallocate()

Ensure that all O_DIRECT reads and writes complete before calling
fallocate so that we don't race w.r.t. attribute updates.

Fixes: 99f237832243 ("NFSv4.2: Always flush out writes in nfs42_proc_fallocate()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index e2fea37c5348..1a169372ca16 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -114,6 +114,7 @@ static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
 	exception.inode = inode;
 	exception.state = lock->open_context->state;
 
+	nfs_file_block_o_direct(NFS_I(inode));
 	err = nfs_sync_inode(inode);
 	if (err)
 		goto out;