NFSv4: Ensure DELEGRETURN returns attributes

 Upon return of a write delegation, the server will almost always bump the
 change attribute. Ensure that we pick up that change so that we don't
 invalidate our data cache unnecessarily.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 41 insertions, 17 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index d2ee09b38cee..66cc720e3927 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -159,8 +159,6 @@ static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *
 {
         int res = 0;
 
-        __nfs_revalidate_inode(NFS_SERVER(inode), inode);
-
         res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid);
         nfs_free_delegation(delegation);
         return res;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index b3349154994b..984ca3454d04 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2920,11 +2920,12 @@ nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
 
 struct nfs4_delegreturndata {
         struct nfs4_delegreturnargs args;
+        struct nfs4_delegreturnres res;
         struct nfs_fh fh;
         nfs4_stateid stateid;
         struct rpc_cred *cred;
         unsigned long timestamp;
-        const struct nfs_server *server;
+        struct nfs_fattr fattr;
         int rpc_status;
 };
 
@@ -2934,8 +2935,10 @@ static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
         struct rpc_message msg = {
                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
                 .rpc_argp = &data->args,
+                .rpc_resp = &data->res,
                 .rpc_cred = data->cred,
         };
+        nfs_fattr_init(data->res.fattr);
         rpc_call_setup(task, &msg, 0);
 }
 
@@ -2944,7 +2947,7 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
         struct nfs4_delegreturndata *data = calldata;
         data->rpc_status = task->tk_status;
         if (data->rpc_status == 0)
-                renew_lease(data->server, data->timestamp);
+                renew_lease(data->res.server, data->timestamp);
 }
 
 static void nfs4_delegreturn_release(void *calldata)
@@ -2964,6 +2967,7 @@ const static struct rpc_call_ops nfs4_delegreturn_ops = {
 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
 {
         struct nfs4_delegreturndata *data;
+        struct nfs_server *server = NFS_SERVER(inode);
         struct rpc_task *task;
         int status;
 
@@ -2972,11 +2976,13 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
                 return -ENOMEM;
         data->args.fhandle = &data->fh;
         data->args.stateid = &data->stateid;
+        data->args.bitmask = server->attr_bitmask;
         nfs_copy_fh(&data->fh, NFS_FH(inode));
         memcpy(&data->stateid, stateid, sizeof(data->stateid));
+        data->res.fattr = &data->fattr;
+        data->res.server = server;
         data->cred = get_rpccred(cred);
         data->timestamp = jiffies;
-        data->server = NFS_SERVER(inode);
         data->rpc_status = 0;
 
         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
@@ -2985,8 +2991,11 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
                 return PTR_ERR(task);
         }
         status = nfs4_wait_for_completion_rpc_task(task);
-        if (status == 0)
+        if (status == 0) {
                 status = data->rpc_status;
+                if (status == 0)
+                        nfs_post_op_update_inode(inode, &data->fattr);
+        }
         rpc_release_task(task);
         return status;
 }
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 5d6bda43dfaa..12be1d682164 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -392,9 +392,11 @@ static int nfs_stat_to_errno(int);
                                 decode_getattr_maxsz)
 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
                                 encode_putfh_maxsz + \
-                                encode_delegreturn_maxsz)
+                                encode_delegreturn_maxsz + \
+                                encode_getattr_maxsz)
 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
-                                decode_delegreturn_maxsz)
+                                decode_delegreturn_maxsz + \
+                                decode_getattr_maxsz)
 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_getattr_maxsz)
@@ -1983,14 +1985,20 @@ static int nfs4_xdr_enc_delegreturn(struct rpc_rqst *req, uint32_t *p, const str
 {
         struct xdr_stream xdr;
         struct compound_hdr hdr = {
-                .nops = 2,
+                .nops = 3,
         };
         int status;
 
         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
         encode_compound_hdr(&xdr, &hdr);
-        if ((status = encode_putfh(&xdr, args->fhandle)) == 0)
-                status = encode_delegreturn(&xdr, args->stateid);
+        status = encode_putfh(&xdr, args->fhandle);
+        if (status != 0)
+                goto out;
+        status = encode_delegreturn(&xdr, args->stateid);
+        if (status != 0)
+                goto out;
+        status = encode_getfattr(&xdr, args->bitmask);
+out:
         return status;
 }
 
@@ -4184,7 +4192,7 @@ static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req, uint32_t *p, s
 /*
  * DELEGRETURN request
  */
-static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, uint32_t *p, void *dummy)
+static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_delegreturnres *res)
 {
         struct xdr_stream xdr;
         struct compound_hdr hdr;
@@ -4192,11 +4200,14 @@ static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, uint32_t *p, void *d
 
         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
         status = decode_compound_hdr(&xdr, &hdr);
-        if (status == 0) {
-                status = decode_putfh(&xdr);
-                if (status == 0)
-                        status = decode_delegreturn(&xdr);
-        }
+        if (status != 0)
+                goto out;
+        status = decode_putfh(&xdr);
+        if (status != 0)
+                goto out;
+        status = decode_delegreturn(&xdr);
+        decode_getfattr(&xdr, res->fattr, res->server);
+out:
         return status;
 }
 
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 9f422fd87673..6d6f69ec5675 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -220,6 +220,12 @@ struct nfs_lockt_res {
 struct nfs4_delegreturnargs {
         const struct nfs_fh *fhandle;
         const nfs4_stateid *stateid;
+        const u32 * bitmask;
+};
+
+struct nfs4_delegreturnres {
+        struct nfs_fattr * fattr;
+        const struct nfs_server *server;
 };
 
 /*