source/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
  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_set_share_fn == NULL) {
  43                 return False;
  44         }
  45
  46         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  47                 /* No real file, don't disturb */
  48                 return True;
  49         }
  50
  51         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  52                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  53         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  54                 GPFS_SHARE_READ : 0;
  55
  56         if (allow == GPFS_SHARE_NONE) {
  57                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  58         }
  59         else {
  60                 deny |= (share_access & FILE_SHARE_WRITE) ?
  61                         0 : GPFS_DENY_WRITE;
  62                 deny |= (share_access & (FILE_SHARE_READ)) ?
  63                         0 : GPFS_DENY_READ;
  64         }
  65         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  66                    access_mask, allow, share_access, deny));
  67
  68         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  69         if (result != 0) {
  70                 if (errno == ENOSYS) {
  71                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  72                                   "support has been compiled into Samba. Allowing access\n"));
  73                         return True;
  74                 } else {
  75                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  76                                    strerror(errno)));
  77                 }
  78         }
  79
  80         return (result == 0);
  81 }
  82
  83 int set_gpfs_lease(int fd, int leasetype)
  84 {
  85         int gpfs_type = GPFS_LEASE_NONE;
  86
  87         if (gpfs_set_lease_fn == NULL) {
  88                 errno = EINVAL;
  89                 return -1;
  90         }
  91
  92         if (leasetype == F_RDLCK) {
  93                 gpfs_type = GPFS_LEASE_READ;
  94         }
  95         if (leasetype == F_WRLCK) {
  96                 gpfs_type = GPFS_LEASE_WRITE;
  97         }
  98         return gpfs_set_lease_fn(fd, gpfs_type);
  99 }
 100
 101 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 102 {
 103         if (gpfs_getacl_fn == NULL) {
 104                 errno = ENOSYS;
 105                 return -1;
 106         }
 107
 108         return gpfs_getacl_fn(pathname, flags, acl);
 109 }
 110
 111 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 112 {
 113         if (gpfs_putacl_fn == NULL) {
 114                 errno = ENOSYS;
 115                 return -1;
 116         }
 117
 118         return gpfs_putacl_fn(pathname, flags, acl);
 119 }
 120
 121 void init_gpfs(void)
 122 {
 123         if (libgpfs_handle != NULL) {
 124                 return;
 125         }
 126
 127         libgpfs_handle = sys_dlopen("libgpfs_gpl.so", RTLD_LAZY);
 128
 129         if (libgpfs_handle == NULL) {
 130                 DEBUG(10, ("sys_dlopen for libgpfs_gpl failed: %s\n",
 131                            strerror(errno)));
 132                 return;
 133         }
 134
 135         DEBUG(10, ("libgpfs_gpl.so loaded\n"));
 136
 137         gpfs_set_share_fn = sys_dlsym(libgpfs_handle, "gpfs_set_share");
 138         if (gpfs_set_share_fn == NULL) {
 139                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 140                           "'gpfs_set_share'\n"));
 141                 sys_dlclose(libgpfs_handle);
 142
 143                 /* leave libgpfs_handle != NULL around, no point
 144                    in trying twice */
 145                 gpfs_set_share_fn = NULL;
 146                 gpfs_set_lease_fn = NULL;
 147                 gpfs_getacl_fn = NULL;
 148                 gpfs_putacl_fn = NULL;
 149                 return;
 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                 /* leave libgpfs_handle != NULL around, no point
 159                    in trying twice */
 160                 gpfs_set_share_fn = NULL;
 161                 gpfs_set_lease_fn = NULL;
 162                 gpfs_getacl_fn = NULL;
 163                 gpfs_putacl_fn = NULL;
 164                 return;
 165         }
 166
 167         gpfs_getacl_fn = sys_dlsym(libgpfs_handle, "gpfs_getacl");
 168         if (gpfs_getacl_fn == NULL) {
 169                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 170                           "'gpfs_getacl'\n"));
 171                 sys_dlclose(libgpfs_handle);
 172
 173                 /* leave libgpfs_handle != NULL around, no point
 174                    in trying twice */
 175                 gpfs_set_share_fn = NULL;
 176                 gpfs_set_lease_fn = NULL;
 177                 gpfs_getacl_fn = NULL;
 178                 gpfs_putacl_fn = NULL;
 179                 return;
 180         }
 181
 182         gpfs_putacl_fn = sys_dlsym(libgpfs_handle, "gpfs_putacl");
 183         if (gpfs_putacl_fn == NULL) {
 184                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 185                           "'gpfs_putacl'\n"));
 186                 sys_dlclose(libgpfs_handle);
 187
 188                 /* leave libgpfs_handle != NULL around, no point
 189                    in trying twice */
 190                 gpfs_set_share_fn = NULL;
 191                 gpfs_set_lease_fn = NULL;
 192                 gpfs_getacl_fn = NULL;
 193                 gpfs_putacl_fn = NULL;
 194                 return;
 195         }
 196
 197 }
 198
 199 #else
 200
 201 int set_gpfs_lease(int snum, int leasetype)
 202 {
 203         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 204
 205         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 206          * that the normal linux kernel oplock code is called. */
 207         errno = ENOSYS;
 208         return -1;
 209 }
 210
 211 BOOL set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 212                         uint32 share_access)
 213 {
 214         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 215         /* Don't disturb but complain */
 216         return True;
 217 }
 218
 219 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 220 {
 221         errno = ENOSYS;
 222         return -1;
 223 }
 224
 225 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 226 {
 227         errno = ENOSYS;
 228         return -1;
 229 }
 230
 231 void init_gpfs(void)
 232 {
 233         return;
 234 }
 235
 236 #endif /* HAVE_GPFS */