source3/smbd/statvfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    VFS API's statvfs abstraction
   4    Copyright (C) Alexander Bokovoy                      2005
   5    Copyright (C) Steve French                           2005
   6    Copyright (C) James Peach                            2006
   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 "system/filesys.h"
  24 #include "smbd/smbd.h"
  25
  26 #if defined(DARWINOS)
  27 #include <sys/attr.h>
  28
  29 static int darwin_fs_capabilities(const char * path)
  30 {
  31         int caps = 0;
  32         vol_capabilities_attr_t *vcaps;
  33         struct attrlist attrlist;
  34         char attrbuf[sizeof(u_int32_t) + sizeof(vol_capabilities_attr_t)];
  35
  36 #define FORMAT_CAP(vinfo, cap) \
  37         ( ((vinfo)->valid[VOL_CAPABILITIES_FORMAT] & (cap)) && \
  38            ((vinfo)->capabilities[VOL_CAPABILITIES_FORMAT] & (cap)) )
  39
  40 #define INTERFACE_CAP(vinfo, cap) \
  41         ( ((vinfo)->valid[VOL_CAPABILITIES_INTERFACES] & (cap)) && \
  42            ((vinfo)->capabilities[VOL_CAPABILITIES_INTERFACES] & (cap)) )
  43
  44         ZERO_STRUCT(attrlist);
  45         attrlist.bitmapcount = ATTR_BIT_MAP_COUNT;
  46         attrlist.volattr = ATTR_VOL_CAPABILITIES;
  47
  48         if (getattrlist(path, &attrlist, attrbuf, sizeof(attrbuf), 0) != 0) {
  49                 DEBUG(0, ("getattrlist for %s capabilities failed: %s\n",
  50                             path, strerror(errno)));
  51                 /* Return no capabilities on failure. */
  52                 return 0;
  53         }
  54
  55         vcaps =
  56             (vol_capabilities_attr_t *)(attrbuf + sizeof(u_int32_t));
  57
  58         if (FORMAT_CAP(vcaps, VOL_CAP_FMT_SPARSE_FILES)) {
  59                 caps |= FILE_SUPPORTS_SPARSE_FILES;
  60         }
  61
  62         if (FORMAT_CAP(vcaps, VOL_CAP_FMT_CASE_SENSITIVE)) {
  63                 caps |= FILE_CASE_SENSITIVE_SEARCH;
  64         }
  65
  66         if (FORMAT_CAP(vcaps, VOL_CAP_FMT_CASE_PRESERVING)) {
  67                 caps |= FILE_CASE_PRESERVED_NAMES;
  68         }
  69
  70         if (INTERFACE_CAP(vcaps, VOL_CAP_INT_EXTENDED_SECURITY)) {
  71                 caps |= FILE_PERSISTENT_ACLS;
  72         }
  73
  74         return caps;
  75 }
  76 #endif /* DARWINOS */
  77
  78 #if defined(BSD_STYLE_STATVFS)
  79 static int bsd_statvfs(const char *path, struct vfs_statvfs_struct *statbuf)
  80 {
  81         struct statfs sbuf;
  82         int ret;
  83
  84         ret = statfs(path, &sbuf);
  85         if (ret == 0) {
  86                 statbuf->OptimalTransferSize = sbuf.f_iosize;
  87                 statbuf->BlockSize = sbuf.f_bsize;
  88                 statbuf->TotalBlocks = sbuf.f_blocks;
  89                 statbuf->BlocksAvail = sbuf.f_bfree;
  90                 statbuf->UserBlocksAvail = sbuf.f_bavail;
  91                 statbuf->TotalFileNodes = sbuf.f_files;
  92                 statbuf->FreeFileNodes = sbuf.f_ffree;
  93                 statbuf->FsIdentifier =
  94                         (((uint64_t) sbuf.f_fsid.val[0] << 32) & 0xffffffff00000000LL) |
  95                             (uint64_t) sbuf.f_fsid.val[1];
  96 #ifdef DARWINOS
  97                 statbuf->FsCapabilities = darwin_fs_capabilities(sbuf.f_mntonname);
  98 #else
  99                 /* Try to extrapolate some of the fs flags into the
 100                  * capabilities
 101                  */
 102                 statbuf->FsCapabilities =
 103                     FILE_CASE_SENSITIVE_SEARCH | FILE_CASE_PRESERVED_NAMES;
 104 #ifdef MNT_ACLS
 105                 if (sbuf.f_flags & MNT_ACLS)
 106                         statbuf->FsCapabilities |= FILE_PERSISTENT_ACLS;
 107 #endif
 108 #endif
 109                 if (sbuf.f_flags & MNT_QUOTA)
 110                         statbuf->FsCapabilities |= FILE_VOLUME_QUOTAS;
 111                 if (sbuf.f_flags & MNT_RDONLY)
 112                         statbuf->FsCapabilities |= FILE_READ_ONLY_VOLUME;
 113         }
 114
 115         return ret;
 116 }
 117 #elif defined(STAT_STATVFS) && defined(HAVE_FSID_INT)
 118 static int posix_statvfs(const char *path, struct vfs_statvfs_struct *statbuf)
 119 {
 120         struct statvfs statvfs_buf;
 121         int result;
 122
 123         result = statvfs(path, &statvfs_buf);
 124
 125         if (!result) {
 126                 /* statvfs bsize is not the statfs bsize, the naming is terrible,
 127                  * see bug 11810 */
 128                 statbuf->OptimalTransferSize = statvfs_buf.f_bsize;
 129                 statbuf->BlockSize = statvfs_buf.f_frsize;
 130                 statbuf->TotalBlocks = statvfs_buf.f_blocks;
 131                 statbuf->BlocksAvail = statvfs_buf.f_bfree;
 132                 statbuf->UserBlocksAvail = statvfs_buf.f_bavail;
 133                 statbuf->TotalFileNodes = statvfs_buf.f_files;
 134                 statbuf->FreeFileNodes = statvfs_buf.f_ffree;
 135                 statbuf->FsIdentifier = statvfs_buf.f_fsid;
 136                 /* Try to extrapolate some of the fs flags into the
 137                  * capabilities
 138                  */
 139                 statbuf->FsCapabilities =
 140                     FILE_CASE_SENSITIVE_SEARCH | FILE_CASE_PRESERVED_NAMES;
 141 #ifdef ST_QUOTA
 142                 if (statvfs_buf.f_flag & ST_QUOTA)
 143                         statbuf->FsCapabilities |= FILE_VOLUME_QUOTAS;
 144 #endif
 145                 if (statvfs_buf.f_flag & ST_RDONLY)
 146                         statbuf->FsCapabilities |= FILE_READ_ONLY_VOLUME;
 147
 148 #if defined(HAVE_FALLOC_FL_PUNCH_HOLE) && defined(HAVE_LSEEK_HOLE_DATA)
 149                 /*
 150                  * Only flag sparse file support if ZERO_DATA can be used to
 151                  * deallocate blocks, and SEEK_HOLE / SEEK_DATA can be used
 152                  * to provide QUERY_ALLOCATED_RANGES information.
 153                  */
 154                 statbuf->FsCapabilities |= FILE_SUPPORTS_SPARSE_FILES;
 155 #endif
 156         }
 157         return result;
 158 }
 159 #endif
 160
 161 /*
 162  sys_statvfs() is an abstraction layer over system-dependent statvfs()/statfs()
 163  for particular POSIX systems. Due to controversy of what is considered more important
 164  between LSB and FreeBSD/POSIX.1 (IEEE Std 1003.1-2001) we need to abstract the interface
 165  so that particular OS would use its preferred interface.
 166 */
 167 int sys_statvfs(const char *path, struct vfs_statvfs_struct *statbuf)
 168 {
 169 #if defined(BSD_STYLE_STATVFS)
 170         return bsd_statvfs(path, statbuf);
 171 #elif defined(STAT_STATVFS) && defined(HAVE_FSID_INT)
 172         return posix_statvfs(path, statbuf);
 173 #else
 174         /* BB change this to return invalid level */
 175 #ifdef EOPNOTSUPP
 176         return EOPNOTSUPP;
 177 #else
 178         return -1;
 179 #endif /* EOPNOTSUPP */
 180 #endif /* LINUX */
 181
 182 }