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 #include "vfs_gpfs.h"
  26
  27 static void *libgpfs_handle = NULL;
  28 static bool gpfs_share_modes;
  29 static bool gpfs_leases;
  30
  31 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  32 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  33 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  34 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  35
  36
  37 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  38                         uint32 share_access)
  39 {
  40         unsigned int allow = GPFS_SHARE_NONE;
  41         unsigned int deny = GPFS_DENY_NONE;
  42         int result;
  43
  44         if (!gpfs_share_modes) {
  45                 return True;
  46         }
  47
  48         if (gpfs_set_share_fn == NULL) {
  49                 return False;
  50         }
  51
  52         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  53                 /* No real file, don't disturb */
  54                 return True;
  55         }
  56
  57         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  58                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  59         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  60                 GPFS_SHARE_READ : 0;
  61
  62         if (allow == GPFS_SHARE_NONE) {
  63                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  64         }
  65         else {
  66                 deny |= (share_access & FILE_SHARE_WRITE) ?
  67                         0 : GPFS_DENY_WRITE;
  68                 deny |= (share_access & (FILE_SHARE_READ)) ?
  69                         0 : GPFS_DENY_READ;
  70         }
  71         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  72                    access_mask, allow, share_access, deny));
  73
  74         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  75         if (result != 0) {
  76                 if (errno == ENOSYS) {
  77                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  78                                   "support has been compiled into Samba. Allowing access\n"));
  79                         return True;
  80                 } else {
  81                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  82                                    strerror(errno)));
  83                 }
  84         }
  85
  86         return (result == 0);
  87 }
  88
  89 int set_gpfs_lease(int fd, int leasetype)
  90 {
  91         int gpfs_type = GPFS_LEASE_NONE;
  92
  93         if (!gpfs_leases) {
  94                 return True;
  95         }
  96
  97         if (gpfs_set_lease_fn == NULL) {
  98                 errno = EINVAL;
  99                 return -1;
 100         }
 101
 102         if (leasetype == F_RDLCK) {
 103                 gpfs_type = GPFS_LEASE_READ;
 104         }
 105         if (leasetype == F_WRLCK) {
 106                 gpfs_type = GPFS_LEASE_WRITE;
 107         }
 108
 109         /* we unconditionally set CAP_LEASE, rather than looking for
 110            -1/EACCES as there is a bug in some versions of
 111            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 112            each time we try this with the wrong capabilities set
 113         */
 114         linux_set_lease_capability();
 115         return gpfs_set_lease_fn(fd, gpfs_type);
 116 }
 117
 118 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 119 {
 120         if (gpfs_getacl_fn == NULL) {
 121                 errno = ENOSYS;
 122                 return -1;
 123         }
 124
 125         return gpfs_getacl_fn(pathname, flags, acl);
 126 }
 127
 128 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 129 {
 130         if (gpfs_putacl_fn == NULL) {
 131                 errno = ENOSYS;
 132                 return -1;
 133         }
 134
 135         return gpfs_putacl_fn(pathname, flags, acl);
 136 }
 137
 138 void init_gpfs(void)
 139 {
 140         if (libgpfs_handle != NULL) {
 141                 return;
 142         }
 143
 144         libgpfs_handle = sys_dlopen("libgpfs_gpl.so", RTLD_LAZY);
 145
 146         if (libgpfs_handle == NULL) {
 147                 DEBUG(10, ("sys_dlopen for libgpfs_gpl failed: %s\n",
 148                            strerror(errno)));
 149                 return;
 150         }
 151
 152         DEBUG(10, ("libgpfs_gpl.so loaded\n"));
 153
 154         gpfs_set_share_fn = sys_dlsym(libgpfs_handle, "gpfs_set_share");
 155         if (gpfs_set_share_fn == NULL) {
 156                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 157                           "'gpfs_set_share'\n"));
 158                 goto failed;
 159         }
 160
 161         gpfs_set_lease_fn = sys_dlsym(libgpfs_handle, "gpfs_set_lease");
 162         if (gpfs_set_lease_fn == NULL) {
 163                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 164                           "'gpfs_set_lease'\n"));
 165                 sys_dlclose(libgpfs_handle);
 166
 167                 goto failed;
 168         }
 169
 170         gpfs_getacl_fn = sys_dlsym(libgpfs_handle, "gpfs_getacl");
 171         if (gpfs_getacl_fn == NULL) {
 172                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 173                           "'gpfs_getacl'\n"));
 174                 goto failed;
 175         }
 176
 177         gpfs_putacl_fn = sys_dlsym(libgpfs_handle, "gpfs_putacl");
 178         if (gpfs_putacl_fn == NULL) {
 179                 DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
 180                           "'gpfs_putacl'\n"));
 181                 goto failed;
 182         }
 183
 184         gpfs_share_modes = lp_parm_bool(-1, "gpfs", "sharemodes", True);
 185         gpfs_leases      = lp_parm_bool(-1, "gpfs", "leases", True);
 186
 187         return;
 188
 189 failed:
 190         sys_dlclose(libgpfs_handle);
 191         /* leave libgpfs_handle != NULL around, no point
 192            in trying twice */
 193         gpfs_set_share_fn = NULL;
 194         gpfs_set_lease_fn = NULL;
 195         gpfs_getacl_fn = NULL;
 196         gpfs_putacl_fn = NULL;
 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 */