[PATCH 6.1.y 7/7] nfsd: Fix a regression in nfsd_setattr()

[cel@xxxxxxxxxx]

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

[ Upstream commit 6412e44c40aaf8f1d7320b2099c5bdd6cb9126ac ]

Commit bb4d53d66e4b ("NFSD: use (un)lock_inode instead of
fh_(un)lock for file operations") broke the NFSv3 pre/post op
attributes behaviour when doing a SETATTR rpc call by stripping out
the calls to fh_fill_pre_attrs() and fh_fill_post_attrs().

Fixes: bb4d53d66e4b ("NFSD: use (un)lock_inode instead of fh_(un)lock for file operations")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Reviewed-by: NeilBrown <neilb@xxxxxxx>
Message-ID: <20240216012451.22725-1-trondmy@xxxxxxxxxx>
[ cel: adjusted to apply to v6.1.y ]
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 fs/nfsd/nfs4proc.c | 4 ++++
 fs/nfsd/vfs.c      | 6 ++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 7451cd34710d..df9dbd93663e 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1106,6 +1106,7 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	};
 	struct inode *inode;
 	__be32 status = nfs_ok;
+	bool save_no_wcc;
 	int err;
 
 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
@@ -1131,8 +1132,11 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 
 	if (status)
 		goto out;
+	save_no_wcc = cstate->current_fh.fh_no_wcc;
+	cstate->current_fh.fh_no_wcc = true;
 	status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs,
 				0, (time64_t)0);
+	cstate->current_fh.fh_no_wcc = save_no_wcc;
 	if (!status)
 		status = nfserrno(attrs.na_labelerr);
 	if (!status)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 17e96e58e772..8f6d611d1380 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -475,7 +475,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	int		accmode = NFSD_MAY_SATTR;
 	umode_t		ftype = 0;
 	__be32		err;
-	int		host_err;
+	int		host_err = 0;
 	bool		get_write_count;
 	bool		size_change = (iap->ia_valid & ATTR_SIZE);
 	int		retries;
@@ -533,6 +533,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	}
 
 	inode_lock(inode);
+	fh_fill_pre_attrs(fhp);
 	for (retries = 1;;) {
 		struct iattr attrs;
 
@@ -560,13 +561,14 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		attr->na_aclerr = set_posix_acl(&init_user_ns,
 						inode, ACL_TYPE_DEFAULT,
 						attr->na_dpacl);
+	fh_fill_post_attrs(fhp);
 	inode_unlock(inode);
 	if (size_change)
 		put_write_access(inode);
 out:
 	if (!host_err)
 		host_err = commit_metadata(fhp);
-	return nfserrno(host_err);
+	return err != 0 ? err : nfserrno(host_err);
 }
 
 #if defined(CONFIG_NFSD_V4)
-- 
2.45.1