deleg: support for CB_GETATTR

on CB_GETATTR, search for a delegation with the given filehandle.  if found, use its fileid to get its cached attributes.  when encoding the response, only include change and size attributes

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>

daemon/callback_server.c

@@ -172,6 +172,18 @@ out:
     return status;
 }
 
+/* OP_CB_GETATTR */
+static enum_t handle_cb_getattr(
+    IN nfs41_rpc_clnt *rpc_clnt,
+    IN struct cb_getattr_args *args,
+    OUT struct cb_getattr_res *res)
+{
+    /* look up cached attributes for the given filehandle */
+    res->status = nfs41_delegation_getattr(rpc_clnt->client,
+        &args->fh, &args->attr_request, &res->info);
+    return res->status;
+}
+
 /* OP_CB_RECALL */
 static enum_t handle_cb_recall(
     IN nfs41_rpc_clnt *rpc_clnt,
@@ -437,7 +449,8 @@ static void handle_cb_compound(nfs41_rpc_clnt *rpc_clnt, cb_req *req, struct cb_
             break;
         case OP_CB_GETATTR:
             dprintf(1, "OP_CB_GETATTR\n");
-            res->status = NFS4ERR_NOTSUPP;
+            res->status = handle_cb_getattr(rpc_clnt, 
+                &argop->args.getattr, &resop->res.getattr);
             break;
         case OP_CB_RECALL:
             dprintf(1, "OP_CB_RECALL\n");

daemon/callback_xdr.c

@@ -25,16 +25,18 @@
  */
 
 #include "nfs41_callback.h"
-
 #include "nfs41_ops.h"
+#include "util.h"
 #include "daemon_debug.h"
 
+
 #define CBXLVL 2 /* dprintf level for callback xdr logging */
 #define CBX_ERR(msg) dprintf((CBXLVL), __FUNCTION__ ": failed at " msg "\n")
 
 
 /* common types */
 bool_t xdr_bitmap4(XDR *xdr, bitmap4 *bitmap);
+bool_t xdr_fattr4(XDR *xdr, fattr4 *fattr);
 
 static bool_t common_stateid(XDR *xdr, stateid4 *stateid)
 {
@@ -245,12 +247,41 @@ out:
 }
 
 /* OP_CB_GETATTR */
-static bool_t op_cb_getattr_args(XDR *xdr, struct cb_getattr_args *res)
+static bool_t op_cb_getattr_args(XDR *xdr, struct cb_getattr_args *args)
 {
     bool_t result;
 
-    result = xdr_u_int32_t(xdr, &res->target_highest_slotid);
+    result = common_fh(xdr, &args->fh);
-    if (!result) { CBX_ERR("getattr.target_highest_slotid"); goto out; }
+    if (!result) { CBX_ERR("getattr.fh"); goto out; }
+
+    result = xdr_bitmap4(xdr, &args->attr_request);
+    if (!result) { CBX_ERR("getattr.attr_request"); goto out; }
+out:
+    return result;
+}
+
+static bool_t info_to_fattr4(nfs41_file_info *info, fattr4 *fattr)
+{
+    XDR fattr_xdr;
+    bool_t result = TRUE;
+
+    /* encode nfs41_file_info into fattr4 */
+    xdrmem_create(&fattr_xdr, (char*)fattr->attr_vals,
+        NFS4_OPAQUE_LIMIT, XDR_ENCODE);
+    
+    /* The only attributes that the server can reliably
+     * query via CB_GETATTR are size and change. */
+    if (bitmap_isset(&info->attrmask, 0, FATTR4_WORD0_CHANGE)) {
+        result = xdr_u_hyper(&fattr_xdr, &info->change);
+        if (!result) { CBX_ERR("getattr.info.change"); goto out; }
+        bitmap_set(&fattr->attrmask, 0, FATTR4_WORD0_CHANGE);
+    }
+    if (bitmap_isset(&info->attrmask, 0, FATTR4_WORD0_SIZE)) {
+        result = xdr_u_hyper(&fattr_xdr, &info->size);
+        if (!result) { CBX_ERR("getattr.info.size"); goto out; }
+        bitmap_set(&fattr->attrmask, 0, FATTR4_WORD0_SIZE);
+    }
+    fattr->attr_vals_len = xdr_getpos(&fattr_xdr);
 out:
     return result;
 }
@@ -261,6 +292,16 @@ static bool_t op_cb_getattr_res(XDR *xdr, struct cb_getattr_res *res)
 
     result = xdr_enum(xdr, &res->status);
     if (!result) { CBX_ERR("getattr.status"); goto out; }
+
+    if (res->status == NFS4_OK) {
+        fattr4 fattr = { 0 };
+
+        result = info_to_fattr4(&res->info, &fattr);
+        if (!result) { goto out; }
+
+        result = xdr_fattr4(xdr, &fattr);
+        if (!result) { CBX_ERR("getattr.obj_attributes"); goto out; }
+    }
 out:
     return result;
 }

daemon/delegation.c

@@ -26,6 +26,7 @@
 
 #include "delegation.h"
 #include "nfs41_ops.h"
+#include "name_cache.h"
 #include "util.h"
 #include "daemon_debug.h"
 
@@ -725,6 +726,49 @@ out_deleg:
 }
 
 
+int nfs41_delegation_getattr(
+    IN nfs41_client *client,
+    IN const nfs41_fh *fh,
+    IN const bitmap4 *attr_request,
+    OUT nfs41_file_info *info)
+{
+    nfs41_delegation_state *deleg;
+    uint64_t fileid;
+    int status;
+
+    dprintf(2, "--> nfs41_delegation_getattr()\n");
+
+    /* search for a delegation on this file handle */
+    status = delegation_find(client, fh, deleg_fh_cmp, &deleg);
+    if (status)
+        goto out;
+
+    AcquireSRWLockShared(&deleg->lock);
+    fileid = deleg->file.fh.fileid;
+    if (deleg->status != DELEGATION_GRANTED ||
+        deleg->state.type != OPEN_DELEGATE_WRITE) {
+        status = NFS4ERR_BADHANDLE;
+    }
+    ReleaseSRWLockShared(&deleg->lock);
+    if (status)
+        goto out;
+
+    ZeroMemory(&info, sizeof(nfs41_file_info));
+
+    /* find attributes for the given fileid */
+    status = nfs41_attr_cache_lookup(
+        client_name_cache(client), fileid, info);
+    if (status) {
+        status = NFS4ERR_BADHANDLE;
+        goto out;
+    }
+out:
+    dprintf(DGLVL, "<-- nfs41_delegation_getattr() returning %s\n",
+        nfs_error_string(status));
+    return status;
+}
+
+
 void nfs41_client_delegation_free(
     IN nfs41_client *client)
 {

daemon/delegation.h

@@ -91,6 +91,12 @@ int nfs41_delegation_recall(
     IN const stateid4 *stateid,
     IN bool_t truncate);
 
+int nfs41_delegation_getattr(
+    IN nfs41_client *client,
+    IN const nfs41_fh *fh,
+    IN const bitmap4 *attr_request,
+    OUT nfs41_file_info *info);
+
 
 /* after client state recovery, return any 'recalled' delegations;
  * must be called under the client's state lock */

daemon/nfs41_callback.h

@@ -124,11 +124,13 @@ struct cb_sequence_res {
 
 /* OP_CB_GETATTR */
 struct cb_getattr_args {
-    uint32_t                target_highest_slotid;
+    nfs41_fh                fh;
+    bitmap4                 attr_request;
 };
 
 struct cb_getattr_res {
     enum_t                  status;
+    nfs41_file_info         info;
 };
 
 /* OP_CB_RECALL */
@@ -231,6 +233,7 @@ union cb_op_args {
     struct cb_layoutrecall_args layoutrecall;
     struct cb_recall_slot_args recall_slot;
     struct cb_sequence_args sequence;
+    struct cb_getattr_args  getattr;
     struct cb_recall_args   recall;
     struct cb_notify_deviceid_args notify_deviceid;
 };
@@ -255,6 +258,7 @@ union cb_op_res {
     struct cb_layoutrecall_res layoutrecall;
     struct cb_recall_slot_res recall_slot;
     struct cb_sequence_res  sequence;
+    struct cb_getattr_res   getattr;
     struct cb_recall_res    recall;
     struct cb_notify_deviceid_res notify_deviceid;
 };

daemon/nfs41_xdr.c

@@ -146,7 +146,7 @@ static bool_t xdr_stateid4(
 }
 
 /* fattr4 */
-static bool_t xdr_fattr4(
+bool_t xdr_fattr4(
     XDR *xdr,
     fattr4 *fattr)
 {