[PATCH] nfsd: fix change_info in NFSv4 RENAME replies

[Jeff Layton <jlayton@kernel.org>]

nfsd sends the transposed directory change info in the RENAME reply. The
source directory is in save_fh and the target is in current_fh.

Reported-by: Zhi Li <yieli@redhat.com>
Reported-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
This bug predates git, so I can't add a proper Fixes tag. I think this
is probably appropriate for stable series kernels though.

This bug was largely papered over by the fact that we factored in the
ctime when generating a change attribute. Since this commit, however:

    638e3e7d9493 nfsd: use the getattr operation to fetch i_version

We stopped doing that for directory inodes and that caused this bug to
pop up.
---
 fs/nfsd/nfs4proc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 5ca748309c26..4199ede0583c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1058,8 +1058,8 @@ nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 			     rename->rn_tname, rename->rn_tnamelen);
 	if (status)
 		return status;
-	set_change_info(&rename->rn_sinfo, &cstate->current_fh);
-	set_change_info(&rename->rn_tinfo, &cstate->save_fh);
+	set_change_info(&rename->rn_sinfo, &cstate->save_fh);
+	set_change_info(&rename->rn_tinfo, &cstate->current_fh);
 	return nfs_ok;
 }
 

---
base-commit: dd1386dd3c4f4bc55456c88180f9f39697bb95c0
change-id: 20230908-nfsd-fixes-f5bdb87e6035

Best regards,
-- 
Jeff Layton <jlayton@kernel.org>