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 bool gpfs_share_modes;
  28 static bool gpfs_leases;
  29 static bool gpfs_getrealfilename;
  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 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  36                                             int *buflen);
  37
  38
  39 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  40                         uint32 share_access)
  41 {
  42         unsigned int allow = GPFS_SHARE_NONE;
  43         unsigned int deny = GPFS_DENY_NONE;
  44         int result;
  45
  46         if (!gpfs_share_modes) {
  47                 return True;
  48         }
  49
  50         if (gpfs_set_share_fn == NULL) {
  51                 return False;
  52         }
  53
  54         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  55                 /* No real file, don't disturb */
  56                 return True;
  57         }
  58
  59         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  60                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  61         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  62                 GPFS_SHARE_READ : 0;
  63
  64         if (allow == GPFS_SHARE_NONE) {
  65                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  66         }
  67         else {
  68                 deny |= (share_access & FILE_SHARE_WRITE) ?
  69                         0 : GPFS_DENY_WRITE;
  70                 deny |= (share_access & (FILE_SHARE_READ)) ?
  71                         0 : GPFS_DENY_READ;
  72         }
  73         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  74                    access_mask, allow, share_access, deny));
  75
  76         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  77         if (result != 0) {
  78                 if (errno == ENOSYS) {
  79                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  80                                   "support has been compiled into Samba. Allowing access\n"));
  81                         return True;
  82                 } else {
  83                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  84                                    strerror(errno)));
  85                 }
  86         }
  87
  88         return (result == 0);
  89 }
  90
  91 int set_gpfs_lease(int fd, int leasetype)
  92 {
  93         int gpfs_type = GPFS_LEASE_NONE;
  94
  95         if (!gpfs_leases) {
  96                 return True;
  97         }
  98
  99         if (gpfs_set_lease_fn == NULL) {
 100                 errno = EINVAL;
 101                 return -1;
 102         }
 103
 104         if (leasetype == F_RDLCK) {
 105                 gpfs_type = GPFS_LEASE_READ;
 106         }
 107         if (leasetype == F_WRLCK) {
 108                 gpfs_type = GPFS_LEASE_WRITE;
 109         }
 110
 111         /* we unconditionally set CAP_LEASE, rather than looking for
 112            -1/EACCES as there is a bug in some versions of
 113            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 114            each time we try this with the wrong capabilities set
 115         */
 116         linux_set_lease_capability();
 117         return gpfs_set_lease_fn(fd, gpfs_type);
 118 }
 119
 120 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 121 {
 122         if (gpfs_getacl_fn == NULL) {
 123                 errno = ENOSYS;
 124                 return -1;
 125         }
 126
 127         return gpfs_getacl_fn(pathname, flags, acl);
 128 }
 129
 130 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 131 {
 132         if (gpfs_putacl_fn == NULL) {
 133                 errno = ENOSYS;
 134                 return -1;
 135         }
 136
 137         return gpfs_putacl_fn(pathname, flags, acl);
 138 }
 139
 140 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 141                                     int *buflen)
 142 {
 143         if ((!gpfs_getrealfilename)
 144             || (gpfs_get_realfilename_path_fn == NULL)) {
 145                 errno = ENOSYS;
 146                 return -1;
 147         }
 148
 149         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 150 }
 151
 152 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 153                                    const char *libname,
 154                                    void *pfn_pointer, const char *fn_name)
 155 {
 156         bool did_open_here = false;
 157         void **libhandle_pointer = (void **)plibhandle_pointer;
 158         void **fn_pointer = (void **)pfn_pointer;
 159
 160         DEBUG(10, ("trying to load name %s from %s\n",
 161                    fn_name, libname));
 162
 163         if (*libhandle_pointer == NULL) {
 164                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 165                 did_open_here = true;
 166         }
 167         if (*libhandle_pointer == NULL) {
 168                 DEBUG(10, ("Could not open lib %s\n", libname));
 169                 return false;
 170         }
 171
 172         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 173         if (*fn_pointer == NULL) {
 174                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 175                            fn_name, libname));
 176                 if (did_open_here) {
 177                         dlclose(*libhandle_pointer);
 178                         *libhandle_pointer = NULL;
 179                 }
 180                 return false;
 181         }
 182
 183         return true;
 184 }
 185
 186 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 187 {
 188         static void *libgpfs_handle = NULL;
 189         static void *libgpfs_gpl_handle = NULL;
 190
 191         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 192                                    fn_pointer, fn_name)) {
 193                 return true;
 194         }
 195         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 196                                    fn_pointer, fn_name)) {
 197                 return true;
 198         }
 199         return false;
 200 }
 201
 202 void init_gpfs(void)
 203 {
 204         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 205         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 206         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 207         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 208         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 209                            "gpfs_get_realfilename_path");
 210
 211         gpfs_share_modes = lp_parm_bool(-1, "gpfs", "sharemodes", True);
 212         gpfs_leases      = lp_parm_bool(-1, "gpfs", "leases", True);
 213         gpfs_getrealfilename = lp_parm_bool(-1, "gpfs", "getrealfilename",
 214                                             True);
 215
 216         return;
 217 }
 218
 219 #else
 220
 221 int set_gpfs_lease(int snum, int leasetype)
 222 {
 223         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 224
 225         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 226          * that the normal linux kernel oplock code is called. */
 227         errno = ENOSYS;
 228         return -1;
 229 }
 230
 231 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 232                         uint32 share_access)
 233 {
 234         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 235         /* Don't disturb but complain */
 236         return True;
 237 }
 238
 239 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 240 {
 241         errno = ENOSYS;
 242         return -1;
 243 }
 244
 245 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 246 {
 247         errno = ENOSYS;
 248         return -1;
 249 }
 250
 251 int smbd_gpfs_get_realfilename_path(char *pathname, char *fileamep,
 252                                     int *buflen)
 253 {
 254         errno = ENOSYS;
 255         return -1;
 256 }
 257
 258 void init_gpfs(void)
 259 {
 260         return;
 261 }
 262
 263 #endif /* HAVE_GPFS */