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