source3/modules/gpfs.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Provide a connection to GPFS specific features
   4  *  Copyright (C) Volker Lendecke 2005
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21
  22 #ifdef HAVE_GPFS
  23
  24 #include "gpfs_gpl.h"
  25
  26 static void *libgpfs_handle = NULL;
  27 static bool gpfs_share_modes;
  28
  29 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  30 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  31 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  32 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  33
  34
  35 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  36                         uint32 share_access)
  37 {
  38         unsigned int allow = GPFS_SHARE_NONE;
  39         unsigned int deny = GPFS_DENY_NONE;
  40         int result;
  41
  42         if (!gpfs_share_modes) {
  43                 return True;
  44         }
  45
  46         if (gpfs_set_share_fn == NULL) {
  47                 return False;
  48         }
  49
  50         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  51                 /* No real file, don't disturb */
  52                 return True;
  53         }
  54
  55         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  56                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  57         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  58                 GPFS_SHARE_READ : 0;
  59
  60         if (allow == GPFS_SHARE_NONE) {
  61                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  62         }
  63         else {
  64                 deny |= (share_access & FILE_SHARE_WRITE) ?
  65                         0 : GPFS_DENY_WRITE;
  66                 deny |= (share_access & (FILE_SHARE_READ)) ?
  67                         0 : GPFS_DENY_READ;
  68         }
  69         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  70                    access_mask, allow, share_access, deny));
  71
  72         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  73         if (result != 0) {
  74                 if (errno == ENOSYS) {
  75                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  76                                   "support has been compiled into Samba. Allowing access\n"));
  77                         return True;
  78                 } else {
  79                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  80                                    strerror(errno)));
  81                 }
  82         }
  83
  84         return (result == 0);
  85 }
  86
  87 int set_gpfs_lease(int fd, int leasetype)
  88 {
  89         int gpfs_type = GPFS_LEASE_NONE;
  90
  91         if (!gpfs_share_modes) {
  92                 return True;
  93         }
  94
  95         if (gpfs_set_lease_fn == NULL) {
  96                 errno = EINVAL;
  97                 return -1;
  98         }
  99
 100         if (leasetype == F_RDLCK) {
 101                 gpfs_type = GPFS_LEASE_READ;
 102         }
 103         if (leasetype == F_WRLCK) {
 104                 gpfs_type = GPFS_LEASE_WRITE;
 105         }
 106         return gpfs_set_lease_fn(fd, gpfs_type);
 107 }
 108
 109 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 110 {
 111         if (gpfs_getacl_fn == NULL) {
 112                 errno = ENOSYS;
 113                 return -1;
 114         }
 115
 116         return gpfs_getacl_fn(pathname, flags, acl);
 117 }
 118
 119 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 120 {
 121         if (gpfs_putacl_fn == NULL) {
 122                 errno = ENOSYS;
 123                 return -1;
 124         }
 125
 126         return gpfs_putacl_fn(pathname, flags, acl);
 127 }
 128
 129 void init_gpfs(void)
 130 {
 131         if (libgpfs_handle != NULL) {
 132                 return;
 133         }
 134
 135         libgpfs_handle = sys_dlopen("libgpfs_gpl.so", RTLD_LAZY);
 136
 137         if (libgpfs_handle == NULL) {
 138                 DEBUG(10, ("sys_dlopen for libgpfs_gpl failed: %s\n",
 139                            strerror(errno)));
 140                 return;
 141         }
 142
 143         DEBUG(10, ("libgpfs_gpl.so loaded\n"));
 144
 145         gpfs_set_share_fn = sys_dlsym(libgpfs_handle, "gpfs_set_share");
 146         if (gpfs_set_share_fn == NULL) {
 147                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 148                           "'gpfs_set_share'\n"));
 149                 goto failed;
 150         }
 151
 152         gpfs_set_lease_fn = sys_dlsym(libgpfs_handle, "gpfs_set_lease");
 153         if (gpfs_set_lease_fn == NULL) {
 154                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 155                           "'gpfs_set_lease'\n"));
 156                 sys_dlclose(libgpfs_handle);
 157
 158                 goto failed;
 159         }
 160
 161         gpfs_getacl_fn = sys_dlsym(libgpfs_handle, "gpfs_getacl");
 162         if (gpfs_getacl_fn == NULL) {
 163                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 164                           "'gpfs_getacl'\n"));
 165                 goto failed;
 166         }
 167
 168         gpfs_putacl_fn = sys_dlsym(libgpfs_handle, "gpfs_putacl");
 169         if (gpfs_putacl_fn == NULL) {
 170                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 171                           "'gpfs_putacl'\n"));
 172                 goto failed;
 173         }
 174
 175         if (lp_parm_bool(-1, "gpfs", "sharemodes", True)) {
 176                 gpfs_share_modes = True;
 177         } else {
 178                 gpfs_share_modes = False;
 179         }
 180
 181         return;
 182
 183 failed:
 184         sys_dlclose(libgpfs_handle);
 185         /* leave libgpfs_handle != NULL around, no point
 186            in trying twice */
 187         gpfs_set_share_fn = NULL;
 188         gpfs_set_lease_fn = NULL;
 189         gpfs_getacl_fn = NULL;
 190         gpfs_putacl_fn = NULL;
 191 }
 192
 193 #else
 194
 195 int set_gpfs_lease(int snum, int leasetype)
 196 {
 197         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 198
 199         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 200          * that the normal linux kernel oplock code is called. */
 201         errno = ENOSYS;
 202         return -1;
 203 }
 204
 205 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 206                         uint32 share_access)
 207 {
 208         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 209         /* Don't disturb but complain */
 210         return True;
 211 }
 212
 213 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 214 {
 215         errno = ENOSYS;
 216         return -1;
 217 }
 218
 219 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 220 {
 221         errno = ENOSYS;
 222         return -1;
 223 }
 224
 225 void init_gpfs(void)
 226 {
 227         return;
 228 }
 229
 230 #endif /* HAVE_GPFS */