source/ntvfs/posix/pvfs_fsinfo.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    POSIX NTVFS backend - fsinfo
   5
   6    Copyright (C) Andrew Tridgell 2004
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "vfs_posix.h"
  24 #include "librpc/gen_ndr/xattr.h"
  25 #include "librpc/ndr/libndr.h"
  26
  27 /* We use libblkid out of e2fsprogs to identify UUID of a volume */
  28 #ifdef HAVE_LIBBLKID
  29 #include <blkid/blkid.h>
  30 #endif
  31
  32 static NTSTATUS pvfs_blkid_fs_uuid(struct pvfs_state *pvfs, struct stat *st, struct GUID *uuid)
  33 {
  34 #ifdef HAVE_LIBBLKID
  35         NTSTATUS status;
  36         char *uuid_value = NULL;
  37         char *devname = NULL;
  38
  39         devname = blkid_devno_to_devname(st->st_dev);
  40         if (!devname) {
  41                 ZERO_STRUCTP(uuid);
  42                 return NT_STATUS_OK;
  43         }
  44
  45         uuid_value = blkid_get_tag_value(NULL, "UUID", devname);
  46         free(devname);
  47         if (!uuid_value) {
  48                 ZERO_STRUCTP(uuid);
  49                 return NT_STATUS_OK;
  50         }
  51
  52         status = GUID_from_string(uuid_value, uuid);
  53         free(uuid_value);
  54         if (!NT_STATUS_IS_OK(status)) {
  55                 ZERO_STRUCTP(uuid);
  56                 return NT_STATUS_OK;
  57         }
  58         return NT_STATUS_OK;
  59 #else
  60         ZERO_STRUCTP(uuid);
  61         return NT_STATUS_OK;
  62 #endif
  63 }
  64
  65 static NTSTATUS pvfs_cache_base_fs_uuid(struct pvfs_state *pvfs, struct stat *st)
  66 {
  67         NTSTATUS status;
  68         struct GUID uuid;
  69
  70         if (pvfs->base_fs_uuid) return NT_STATUS_OK;
  71
  72         status = pvfs_blkid_fs_uuid(pvfs, st, &uuid);
  73         NT_STATUS_NOT_OK_RETURN(status);
  74
  75         pvfs->base_fs_uuid = talloc(pvfs, struct GUID);
  76         NT_STATUS_HAVE_NO_MEMORY(pvfs->base_fs_uuid);
  77         *pvfs->base_fs_uuid = uuid;
  78
  79         return NT_STATUS_OK;
  80 }
  81 /*
  82   return filesystem space info
  83 */
  84 NTSTATUS pvfs_fsinfo(struct ntvfs_module_context *ntvfs,
  85                      struct ntvfs_request *req, union smb_fsinfo *fs)
  86 {
  87         NTSTATUS status;
  88         struct pvfs_state *pvfs = ntvfs->private_data;
  89         uint64_t blocks_free, blocks_total;
  90         uint_t bpunit;
  91         struct stat st;
  92         const uint16_t block_size = 512;
  93
  94         /* only some levels need the expensive sys_fsusage() call */
  95         switch (fs->generic.level) {
  96         case RAW_QFS_DSKATTR:
  97         case RAW_QFS_ALLOCATION:
  98         case RAW_QFS_SIZE_INFO:
  99         case RAW_QFS_SIZE_INFORMATION:
 100         case RAW_QFS_FULL_SIZE_INFORMATION:
 101                 if (sys_fsusage(pvfs->base_directory, &blocks_free, &blocks_total) == -1) {
 102                         return pvfs_map_errno(pvfs, errno);
 103                 }
 104         default:
 105                 break;
 106         }
 107
 108         if (stat(pvfs->base_directory, &st) != 0) {
 109                 return NT_STATUS_DISK_CORRUPT_ERROR;
 110         }
 111
 112         /* now fill in the out fields */
 113         switch (fs->generic.level) {
 114         case RAW_QFS_GENERIC:
 115                 return NT_STATUS_INVALID_LEVEL;
 116
 117         case RAW_QFS_DSKATTR:
 118                 /* we need to scale the sizes to fit */
 119                 for (bpunit=64; bpunit<0x10000; bpunit *= 2) {
 120                         if (blocks_total * (double)block_size < bpunit * 512 * 65535.0) {
 121                                 break;
 122                         }
 123                 }
 124                 fs->dskattr.out.blocks_per_unit = bpunit;
 125                 fs->dskattr.out.block_size = block_size;
 126                 fs->dskattr.out.units_total = (blocks_total * (double)block_size) / (bpunit * 512);
 127                 fs->dskattr.out.units_free  = (blocks_free  * (double)block_size) / (bpunit * 512);
 128
 129                 /* we must return a maximum of 2G to old DOS systems, or they get very confused */
 130                 if (bpunit > 64 && req->ctx->protocol <= PROTOCOL_LANMAN2) {
 131                         fs->dskattr.out.blocks_per_unit = 64;
 132                         fs->dskattr.out.units_total = 0xFFFF;
 133                         fs->dskattr.out.units_free = 0xFFFF;
 134                 }
 135                 return NT_STATUS_OK;
 136
 137         case RAW_QFS_ALLOCATION:
 138                 fs->allocation.out.fs_id = st.st_dev;
 139                 fs->allocation.out.total_alloc_units = blocks_total;
 140                 fs->allocation.out.avail_alloc_units = blocks_free;
 141                 fs->allocation.out.sectors_per_unit = 1;
 142                 fs->allocation.out.bytes_per_sector = block_size;
 143                 return NT_STATUS_OK;
 144
 145         case RAW_QFS_VOLUME:
 146                 fs->volume.out.serial_number = st.st_ino;
 147                 fs->volume.out.volume_name.s = pvfs->share_name;
 148                 return NT_STATUS_OK;
 149
 150         case RAW_QFS_VOLUME_INFO:
 151         case RAW_QFS_VOLUME_INFORMATION:
 152                 unix_to_nt_time(&fs->volume_info.out.create_time, st.st_ctime);
 153                 fs->volume_info.out.serial_number = st.st_ino;
 154                 fs->volume_info.out.volume_name.s = pvfs->share_name;
 155                 return NT_STATUS_OK;
 156
 157         case RAW_QFS_SIZE_INFO:
 158         case RAW_QFS_SIZE_INFORMATION:
 159                 fs->size_info.out.total_alloc_units = blocks_total;
 160                 fs->size_info.out.avail_alloc_units = blocks_free;
 161                 fs->size_info.out.sectors_per_unit = 1;
 162                 fs->size_info.out.bytes_per_sector = block_size;
 163                 return NT_STATUS_OK;
 164
 165         case RAW_QFS_DEVICE_INFO:
 166         case RAW_QFS_DEVICE_INFORMATION:
 167                 fs->device_info.out.device_type = 0;
 168                 fs->device_info.out.characteristics = 0;
 169                 return NT_STATUS_OK;
 170
 171         case RAW_QFS_ATTRIBUTE_INFO:
 172         case RAW_QFS_ATTRIBUTE_INFORMATION:
 173                 fs->attribute_info.out.fs_attr                   = pvfs->fs_attribs;
 174                 fs->attribute_info.out.max_file_component_length = 255;
 175                 fs->attribute_info.out.fs_type.s                 = ntvfs->ctx->fs_type;
 176                 return NT_STATUS_OK;
 177
 178         case RAW_QFS_QUOTA_INFORMATION:
 179                 ZERO_STRUCT(fs->quota_information.out.unknown);
 180                 fs->quota_information.out.quota_soft = 0;
 181                 fs->quota_information.out.quota_hard = 0;
 182                 fs->quota_information.out.quota_flags = 0;
 183                 return NT_STATUS_OK;
 184
 185         case RAW_QFS_FULL_SIZE_INFORMATION:
 186                 fs->full_size_information.out.total_alloc_units = blocks_total;
 187                 fs->full_size_information.out.call_avail_alloc_units = blocks_free;
 188                 fs->full_size_information.out.actual_avail_alloc_units = blocks_free;
 189                 fs->full_size_information.out.sectors_per_unit = 1;
 190                 fs->full_size_information.out.bytes_per_sector = block_size;
 191                 return NT_STATUS_OK;
 192
 193         case RAW_QFS_OBJECTID_INFORMATION:
 194                 ZERO_STRUCT(fs->objectid_information.out.guid);
 195                 ZERO_STRUCT(fs->objectid_information.out.unknown);
 196
 197                 status = pvfs_cache_base_fs_uuid(pvfs, &st);
 198                 NT_STATUS_NOT_OK_RETURN(status);
 199
 200                 fs->objectid_information.out.guid = *pvfs->base_fs_uuid;
 201                 return NT_STATUS_OK;
 202
 203         default:
 204                 break;
 205         }
 206         return NT_STATUS_INVALID_LEVEL;
 207 }