symlink: driver marshalls new SYMLINK upcall

new NFS41_SYMLINK upcall and associated data in nfs41_updowncall_entry.u.Symlink
supports both setting and querying the symlink target.  if Symlink.set is TRUE, Symlink.target is marshalled into the upcall.  if Symlink.set is FALSE, Symlink.target is read from the downcall

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

sys/nfs41_debug.c

@@ -579,6 +579,7 @@ const char *opcode2string(int opcode)
     case NFS41_FILE_QUERY: return "NFS41_FILE_QUERY";
     case NFS41_FILE_SET: return "NFS41_FILE_SET";
     case NFS41_EA_SET: return "NFS41_EA_SET";
+    case NFS41_SYMLINK: return "NFS41_SYMLINK";
     case NFS41_VOLUME_QUERY: return "NFS41_VOLUME_QUERY";
     default: return "UNKNOWN";
     }

sys/nfs41_driver.c

@@ -198,6 +198,13 @@ typedef struct _updowncall_entry {
             HANDLE session;
             DWORD mode;
         } SetEa;
+        struct {
+            HANDLE open_state;
+            HANDLE session;
+            PUNICODE_STRING filename;
+            PUNICODE_STRING target;
+            BOOLEAN set;
+        } Symlink;
         struct {
             HANDLE session;
             FS_INFORMATION_CLASS query;
@@ -968,6 +975,49 @@ out:
     return status;
 }
 
+NTSTATUS marshal_nfs41_symlink(nfs41_updowncall_entry *entry,
+    unsigned char *buf,
+    ULONG buf_len,
+    ULONG *len)
+{
+    NTSTATUS status = STATUS_SUCCESS;
+    ULONG header_len = 0;
+    unsigned char *tmp = buf;
+
+    DbgEn();
+    status = marshal_nfs41_header(entry, tmp, buf_len, len);
+    if (status == STATUS_INSUFFICIENT_RESOURCES) 
+        goto out;
+    else 
+        tmp += *len;
+    header_len = *len + 2 * sizeof(HANDLE) + sizeof(BOOLEAN) +
+        length_as_ansi(entry->u.Symlink.filename);
+    if (entry->u.Symlink.set)
+        header_len += length_as_ansi(entry->u.Symlink.target);
+    if (header_len > buf_len) { 
+        status = STATUS_INSUFFICIENT_RESOURCES;
+        goto out;
+    }
+
+    RtlCopyMemory(tmp, &entry->u.Symlink.session, sizeof(HANDLE));
+    tmp += sizeof(HANDLE);
+    RtlCopyMemory(tmp, &entry->u.Symlink.open_state, sizeof(HANDLE));
+    tmp += sizeof(HANDLE);
+    marshall_unicode_as_ansi(&tmp, entry->u.Symlink.filename);
+    RtlCopyMemory(tmp, &entry->u.Symlink.set, sizeof(BOOLEAN));
+    tmp += sizeof(BOOLEAN);
+    if (entry->u.Symlink.set)
+        marshall_unicode_as_ansi(&tmp, entry->u.Symlink.target);
+
+    *len = header_len;
+
+    DbgP("session=0x%x open_state=0x%x set=0x%x\n",
+        entry->u.SetEa.session, entry->u.SetEa.open_state, entry->u.SetEa.mode);
+out:
+    DbgEx();
+    return status;
+}
+
 NTSTATUS marshal_nfs41_volume(nfs41_updowncall_entry *entry,
     unsigned char *buf,
     ULONG buf_len,
@@ -1086,6 +1136,9 @@ handle_upcall(
     case NFS41_EA_SET:
         status = marshal_nfs41_easet(entry, pbOut, cbOut, len);
         break;
+    case NFS41_SYMLINK:
+        status = marshal_nfs41_symlink(entry, pbOut, cbOut, len);
+        break;
     case NFS41_VOLUME_QUERY:
         status = marshal_nfs41_volume(entry, pbOut, cbOut, len);
         break;
@@ -1370,6 +1423,19 @@ nfs41_downcall (
                 RtlCopyMemory(&cur->u.QueryFile.readdir_cookie, buf, sizeof(HANDLE));
             }
             break;
+        case NFS41_SYMLINK:
+            if (cur->u.Symlink.set)
+                break;
+            RtlCopyMemory(&cur->u.Symlink.target->Length, buf, sizeof(USHORT));
+            buf += sizeof(USHORT);
+            if (cur->u.Symlink.target->Length > cur->u.Symlink.target->MaximumLength) {
+                cur->status = STATUS_BUFFER_TOO_SMALL;
+                break;
+            }
+            RtlCopyMemory(cur->u.Symlink.target->Buffer, buf,
+                cur->u.Symlink.target->Length);
+            cur->u.Symlink.target->Length -= sizeof(UNICODE_NULL);
+            break;
         case NFS41_VOLUME_QUERY:
             RtlCopyMemory(&tmp->u.Volume.buf_len, buf, sizeof(LONG));
             buf += sizeof(LONG);

sys/nfs41_driver.h

@@ -64,6 +64,7 @@ typedef enum _nfs41_opcodes {
     NFS41_FILE_QUERY,
     NFS41_FILE_SET,
     NFS41_EA_SET,
+    NFS41_SYMLINK,
     NFS41_VOLUME_QUERY,
     NFS41_SHUTDOWN,
     INVALID_OPCODE