base/services/nfsd/getattr.c

   1 /* NFSv4.1 client for Windows
   2  * Copyright © 2012 The Regents of the University of Michigan
   3  *
   4  * Olga Kornievskaia <aglo@umich.edu>
   5  * Casey Bodley <cbodley@umich.edu>
   6  *
   7  * This library is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU Lesser General Public License as published by
   9  * the Free Software Foundation; either version 2.1 of the License, or (at
  10  * your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful, but
  13  * without any warranty; without even the implied warranty of merchantability
  14  * or fitness for a particular purpose.  See the GNU Lesser General Public
  15  * License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with this library; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  */
  21
  22 #include <windows.h>
  23 #include <stdio.h>
  24 #include <strsafe.h>
  25
  26 #include "nfs41_ops.h"
  27 #include "name_cache.h"
  28 #include "upcall.h"
  29 #include "daemon_debug.h"
  30
  31
  32 int nfs41_cached_getattr(
  33     IN nfs41_session *session,
  34     IN nfs41_path_fh *file,
  35     OUT nfs41_file_info *info)
  36 {
  37     int status;
  38
  39     /* first look for cached attributes */
  40     status = nfs41_attr_cache_lookup(session_name_cache(session),
  41         file->fh.fileid, info);
  42
  43     if (status) {
  44         /* fetch attributes from the server */
  45         bitmap4 attr_request;
  46         nfs41_superblock_getattr_mask(file->fh.superblock, &attr_request);
  47
  48         status = nfs41_getattr(session, file, &attr_request, info);
  49         if (status) {
  50             eprintf("nfs41_getattr() failed with %s\n",
  51                 nfs_error_string(status));
  52             status = nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
  53         }
  54     }
  55     return status;
  56 }
  57
  58 /* NFS41_FILE_QUERY */
  59 static int parse_getattr(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
  60 {
  61     int status;
  62     getattr_upcall_args *args = &upcall->args.getattr;
  63
  64     status = safe_read(&buffer, &length, &args->query_class, sizeof(args->query_class));
  65     if (status) goto out;
  66     status = safe_read(&buffer, &length, &args->buf_len, sizeof(args->buf_len));
  67     if (status) goto out;
  68
  69     dprintf(1, "parsing NFS41_FILE_QUERY: info_class=%d buf_len=%d file=%.*s\n",
  70         args->query_class, args->buf_len, upcall->state_ref->path.len,
  71         upcall->state_ref->path.path);
  72 out:
  73     return status;
  74 }
  75
  76 static int handle_getattr(nfs41_upcall *upcall)
  77 {
  78     int status;
  79     getattr_upcall_args *args = &upcall->args.getattr;
  80     nfs41_open_state *state = upcall->state_ref;
  81     nfs41_file_info info = { 0 };
  82
  83     status = nfs41_cached_getattr(state->session, &state->file, &info);
  84     if (status) {
  85         eprintf("nfs41_cached_getattr() failed with %d\n", status);
  86         goto out;
  87     }
  88
  89     if (info.type == NF4LNK) {
  90         nfs41_file_info target_info;
  91         int target_status = nfs41_symlink_follow(upcall->root_ref,
  92             state->session, &state->file, &target_info);
  93         if (target_status == NO_ERROR && target_info.type == NF4DIR)
  94             info.symlink_dir = TRUE;
  95     }
  96
  97     switch (args->query_class) {
  98     case FileBasicInformation:
  99         nfs_to_basic_info(&info, &args->basic_info);
 100         args->ctime = info.change;
 101         break;
 102     case FileStandardInformation:
 103         nfs_to_standard_info(&info, &args->std_info);
 104         break;
 105     case FileAttributeTagInformation:
 106         args->tag_info.FileAttributes = nfs_file_info_to_attributes(&info);
 107         args->tag_info.ReparseTag = info.type == NF4LNK ?
 108             IO_REPARSE_TAG_SYMLINK : 0;
 109         break;
 110     case FileInternalInformation:
 111         args->intr_info.IndexNumber.QuadPart = info.fileid;
 112         break;
 113     case FileNetworkOpenInformation:
 114         nfs_to_network_openinfo(&info, &args->network_info);
 115         break;
 116     default:
 117         eprintf("unhandled file query class %d\n", args->query_class);
 118         status = ERROR_INVALID_PARAMETER;
 119         break;
 120     }
 121 out:
 122     return status;
 123 }
 124
 125 static int marshall_getattr(unsigned char *buffer, uint32_t *length, nfs41_upcall *upcall)
 126 {
 127     int status;
 128     getattr_upcall_args *args = &upcall->args.getattr;
 129     uint32_t info_len;
 130
 131     switch (args->query_class) {
 132     case FileBasicInformation:
 133         info_len = sizeof(args->basic_info);
 134         status = safe_write(&buffer, length, &info_len, sizeof(info_len));
 135         if (status) goto out;
 136         status = safe_write(&buffer, length, &args->basic_info, info_len);
 137         if (status) goto out;
 138         break;
 139     case FileStandardInformation:
 140         info_len = sizeof(args->std_info);
 141         status = safe_write(&buffer, length, &info_len, sizeof(info_len));
 142         if (status) goto out;
 143         status = safe_write(&buffer, length, &args->std_info, info_len);
 144         if (status) goto out;
 145         break;
 146     case FileAttributeTagInformation:
 147         info_len = sizeof(args->tag_info);
 148         status = safe_write(&buffer, length, &info_len, sizeof(info_len));
 149         if (status) goto out;
 150         status = safe_write(&buffer, length, &args->tag_info, info_len);
 151         if (status) goto out;
 152         break;
 153     case FileInternalInformation:
 154         info_len = sizeof(args->intr_info);
 155         status = safe_write(&buffer, length, &info_len, sizeof(info_len));
 156         if (status) goto out;
 157         status = safe_write(&buffer, length, &args->intr_info, info_len);
 158         if (status) goto out;
 159         break;
 160     case FileNetworkOpenInformation:
 161         info_len = sizeof(args->network_info);
 162         status = safe_write(&buffer, length, &info_len, sizeof(info_len));
 163         if (status) goto out;
 164         status = safe_write(&buffer, length, &args->network_info, info_len);
 165         if (status) goto out;
 166         break;
 167     default:
 168         eprintf("unknown file query class %d\n", args->query_class);
 169         status = 103;
 170         goto out;
 171     }
 172     status = safe_write(&buffer, length, &args->ctime, sizeof(args->ctime));
 173     if (status) goto out;
 174     dprintf(1, "NFS41_FILE_QUERY: downcall changattr=%llu\n", args->ctime);
 175 out:
 176     return status;
 177 }
 178
 179
 180 const nfs41_upcall_op nfs41_op_getattr = {
 181     parse_getattr,
 182     handle_getattr,
 183     marshall_getattr
 184 };