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 2 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, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "includes.h"
  22
  23 #ifdef HAVE_GPFS
  24
  25 #include "gpfs_gpl.h"
  26
  27 static void *libgpfs_handle = NULL;
  28 static BOOL gpfs_share_modes;
  29
  30 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  31 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  32 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  33 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  34
  35
  36 BOOL set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  37                         uint32 share_access)
  38 {
  39         unsigned int allow = GPFS_SHARE_NONE;
  40         unsigned int deny = GPFS_DENY_NONE;
  41         int result;
  42
  43         if (!gpfs_share_modes) {
  44                 return True;
  45         }
  46
  47         if (gpfs_set_share_fn == NULL) {
  48                 return False;
  49         }
  50
  51         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  52                 /* No real file, don't disturb */
  53                 return True;
  54         }
  55
  56         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  57                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  58         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  59                 GPFS_SHARE_READ : 0;
  60
  61         if (allow == GPFS_SHARE_NONE) {
  62                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  63         }
  64         else {
  65                 deny |= (share_access & FILE_SHARE_WRITE) ?
  66                         0 : GPFS_DENY_WRITE;
  67                 deny |= (share_access & (FILE_SHARE_READ)) ?
  68                         0 : GPFS_DENY_READ;
  69         }
  70         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  71                    access_mask, allow, share_access, deny));
  72
  73         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  74         if (result != 0) {
  75                 if (errno == ENOSYS) {
  76                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  77                                   "support has been compiled into Samba. Allowing access\n"));
  78                         return True;
  79                 } else {
  80                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  81                                    strerror(errno)));
  82                 }
  83         }
  84
  85         return (result == 0);
  86 }
  87
  88 int set_gpfs_lease(int fd, int leasetype)
  89 {
  90         int gpfs_type = GPFS_LEASE_NONE;
  91
  92         if (!gpfs_share_modes) {
  93                 return True;
  94         }
  95
  96         if (gpfs_set_lease_fn == NULL) {
  97                 errno = EINVAL;
  98                 return -1;
  99         }
 100
 101         if (leasetype == F_RDLCK) {
 102                 gpfs_type = GPFS_LEASE_READ;
 103         }
 104         if (leasetype == F_WRLCK) {
 105                 gpfs_type = GPFS_LEASE_WRITE;
 106         }
 107         return gpfs_set_lease_fn(fd, gpfs_type);
 108 }
 109
 110 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 111 {
 112         if (gpfs_getacl_fn == NULL) {
 113                 errno = ENOSYS;
 114                 return -1;
 115         }
 116
 117         return gpfs_getacl_fn(pathname, flags, acl);
 118 }
 119
 120 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 121 {
 122         if (gpfs_putacl_fn == NULL) {
 123                 errno = ENOSYS;
 124                 return -1;
 125         }
 126
 127         return gpfs_putacl_fn(pathname, flags, acl);
 128 }
 129
 130 void init_gpfs(void)
 131 {
 132         if (libgpfs_handle != NULL) {
 133                 return;
 134         }
 135
 136         libgpfs_handle = sys_dlopen("libgpfs_gpl.so", RTLD_LAZY);
 137
 138         if (libgpfs_handle == NULL) {
 139                 DEBUG(10, ("sys_dlopen for libgpfs_gpl failed: %s\n",
 140                            strerror(errno)));
 141                 return;
 142         }
 143
 144         DEBUG(10, ("libgpfs_gpl.so loaded\n"));
 145
 146         gpfs_set_share_fn = sys_dlsym(libgpfs_handle, "gpfs_set_share");
 147         if (gpfs_set_share_fn == NULL) {
 148                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 149                           "'gpfs_set_share'\n"));
 150                 goto failed;
 151         }
 152
 153         gpfs_set_lease_fn = sys_dlsym(libgpfs_handle, "gpfs_set_lease");
 154         if (gpfs_set_lease_fn == NULL) {
 155                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 156                           "'gpfs_set_lease'\n"));
 157                 sys_dlclose(libgpfs_handle);
 158
 159                 goto failed;
 160         }
 161
 162         gpfs_getacl_fn = sys_dlsym(libgpfs_handle, "gpfs_getacl");
 163         if (gpfs_getacl_fn == NULL) {
 164                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 165                           "'gpfs_getacl'\n"));
 166                 goto failed;
 167         }
 168
 169         gpfs_putacl_fn = sys_dlsym(libgpfs_handle, "gpfs_putacl");
 170         if (gpfs_putacl_fn == NULL) {
 171                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 172                           "'gpfs_putacl'\n"));
 173                 goto failed;
 174         }
 175
 176         if (lp_parm_bool(-1, "gpfs", "sharemodes", True)) {
 177                 gpfs_share_modes = True;
 178         } else {
 179                 gpfs_share_modes = False;
 180         }
 181
 182         return;
 183
 184 failed:
 185         sys_dlclose(libgpfs_handle);
 186         /* leave libgpfs_handle != NULL around, no point
 187            in trying twice */
 188         gpfs_set_share_fn = NULL;
 189         gpfs_set_lease_fn = NULL;
 190         gpfs_getacl_fn = NULL;
 191         gpfs_putacl_fn = NULL;
 192 }
 193
 194 #else
 195
 196 int set_gpfs_lease(int snum, int leasetype)
 197 {
 198         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 199
 200         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 201          * that the normal linux kernel oplock code is called. */
 202         errno = ENOSYS;
 203         return -1;
 204 }
 205
 206 BOOL set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 207                         uint32 share_access)
 208 {
 209         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 210         /* Don't disturb but complain */
 211         return True;
 212 }
 213
 214 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 215 {
 216         errno = ENOSYS;
 217         return -1;
 218 }
 219
 220 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 221 {
 222         errno = ENOSYS;
 223         return -1;
 224 }
 225
 226 void init_gpfs(void)
 227 {
 228         return;
 229 }
 230
 231 #endif /* HAVE_GPFS */