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 static bool gpfs_winattr;
  31
  32 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  33 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  34 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  35 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  36 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  37                                             int *buflen);
  38 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
  39 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
  40 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  41
  42
  43 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  44                         uint32 share_access)
  45 {
  46         unsigned int allow = GPFS_SHARE_NONE;
  47         unsigned int deny = GPFS_DENY_NONE;
  48         int result;
  49
  50         if (!gpfs_share_modes) {
  51                 return True;
  52         }
  53
  54         if (gpfs_set_share_fn == NULL) {
  55                 return False;
  56         }
  57
  58         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  59                 /* No real file, don't disturb */
  60                 return True;
  61         }
  62
  63         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  64                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  65         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  66                 GPFS_SHARE_READ : 0;
  67
  68         if (allow == GPFS_SHARE_NONE) {
  69                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  70         }
  71         else {
  72                 deny |= (share_access & FILE_SHARE_WRITE) ?
  73                         0 : GPFS_DENY_WRITE;
  74                 deny |= (share_access & (FILE_SHARE_READ)) ?
  75                         0 : GPFS_DENY_READ;
  76         }
  77         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  78                    access_mask, allow, share_access, deny));
  79
  80         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  81         if (result != 0) {
  82                 if (errno == ENOSYS) {
  83                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  84                                   "support has been compiled into Samba. Allowing access\n"));
  85                         return True;
  86                 } else {
  87                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  88                                    strerror(errno)));
  89                 }
  90         }
  91
  92         return (result == 0);
  93 }
  94
  95 int set_gpfs_lease(int fd, int leasetype)
  96 {
  97         int gpfs_type = GPFS_LEASE_NONE;
  98
  99         if (!gpfs_leases) {
 100                 return True;
 101         }
 102
 103         if (gpfs_set_lease_fn == NULL) {
 104                 errno = EINVAL;
 105                 return -1;
 106         }
 107
 108         if (leasetype == F_RDLCK) {
 109                 gpfs_type = GPFS_LEASE_READ;
 110         }
 111         if (leasetype == F_WRLCK) {
 112                 gpfs_type = GPFS_LEASE_WRITE;
 113         }
 114
 115         /* we unconditionally set CAP_LEASE, rather than looking for
 116            -1/EACCES as there is a bug in some versions of
 117            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 118            each time we try this with the wrong capabilities set
 119         */
 120         linux_set_lease_capability();
 121         return gpfs_set_lease_fn(fd, gpfs_type);
 122 }
 123
 124 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 125 {
 126         if (gpfs_getacl_fn == NULL) {
 127                 errno = ENOSYS;
 128                 return -1;
 129         }
 130
 131         return gpfs_getacl_fn(pathname, flags, acl);
 132 }
 133
 134 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 135 {
 136         if (gpfs_putacl_fn == NULL) {
 137                 errno = ENOSYS;
 138                 return -1;
 139         }
 140
 141         return gpfs_putacl_fn(pathname, flags, acl);
 142 }
 143
 144 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 145                                     int *buflen)
 146 {
 147         if ((!gpfs_getrealfilename)
 148             || (gpfs_get_realfilename_path_fn == NULL)) {
 149                 errno = ENOSYS;
 150                 return -1;
 151         }
 152
 153         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 154 }
 155
 156 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 157 {
 158
 159         if ((!gpfs_winattr) || (gpfs_get_winattrs_path_fn == NULL)) {
 160                 errno = ENOSYS;
 161                 return -1;
 162         }
 163         DEBUG(10, ("gpfs_get_winattrs_path:open call %s\n",pathname));
 164         return gpfs_get_winattrs_path_fn(pathname, attrs);
 165 }
 166
 167 int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
 168 {
 169
 170         if ((!gpfs_winattr) || (gpfs_get_winattrs_fn == NULL)) {
 171                 errno = ENOSYS;
 172                 return -1;
 173         }
 174         DEBUG(10, ("gpfs_get_winattrs_path:open call %d\n", fd));
 175         return gpfs_get_winattrs_fn(fd, attrs);
 176 }
 177
 178 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 179 {
 180         if ((!gpfs_winattr) || (gpfs_set_winattrs_path_fn == NULL)) {
 181                 errno = ENOSYS;
 182                 return -1;
 183         }
 184
 185         DEBUG(10, ("gpfs_set_winattrs_path:open call %s\n",pathname));
 186         return gpfs_set_winattrs_path_fn(pathname,flags, attrs);
 187 }
 188
 189 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 190                                    const char *libname,
 191                                    void *pfn_pointer, const char *fn_name)
 192 {
 193         bool did_open_here = false;
 194         void **libhandle_pointer = (void **)plibhandle_pointer;
 195         void **fn_pointer = (void **)pfn_pointer;
 196
 197         DEBUG(10, ("trying to load name %s from %s\n",
 198                    fn_name, libname));
 199
 200         if (*libhandle_pointer == NULL) {
 201                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 202                 did_open_here = true;
 203         }
 204         if (*libhandle_pointer == NULL) {
 205                 DEBUG(10, ("Could not open lib %s\n", libname));
 206                 return false;
 207         }
 208
 209         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 210         if (*fn_pointer == NULL) {
 211                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 212                            fn_name, libname));
 213                 if (did_open_here) {
 214                         dlclose(*libhandle_pointer);
 215                         *libhandle_pointer = NULL;
 216                 }
 217                 return false;
 218         }
 219
 220         return true;
 221 }
 222
 223 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 224 {
 225         static void *libgpfs_handle = NULL;
 226         static void *libgpfs_gpl_handle = NULL;
 227
 228         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 229                                    fn_pointer, fn_name)) {
 230                 return true;
 231         }
 232         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 233                                    fn_pointer, fn_name)) {
 234                 return true;
 235         }
 236         return false;
 237 }
 238
 239 void init_gpfs(void)
 240 {
 241         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 242         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 243         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 244         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 245         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 246                            "gpfs_get_realfilename_path");
 247         init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
 248         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
 249         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
 250
 251
 252         gpfs_share_modes = lp_parm_bool(-1, "gpfs", "sharemodes", True);
 253         gpfs_leases      = lp_parm_bool(-1, "gpfs", "leases", True);
 254         gpfs_getrealfilename = lp_parm_bool(-1, "gpfs", "getrealfilename",
 255                                             True);
 256         gpfs_winattr = lp_parm_bool(-1, "gpfs", "winattr", False);
 257
 258         return;
 259 }
 260
 261 #else
 262
 263 int set_gpfs_lease(int snum, int leasetype)
 264 {
 265         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 266
 267         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 268          * that the normal linux kernel oplock code is called. */
 269         errno = ENOSYS;
 270         return -1;
 271 }
 272
 273 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 274                         uint32 share_access)
 275 {
 276         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 277         /* Don't disturb but complain */
 278         return True;
 279 }
 280
 281 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 282 {
 283         errno = ENOSYS;
 284         return -1;
 285 }
 286
 287 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 288 {
 289         errno = ENOSYS;
 290         return -1;
 291 }
 292
 293 int smbd_gpfs_get_realfilename_path(char *pathname, char *fileamep,
 294                                     int *buflen)
 295 {
 296         errno = ENOSYS;
 297         return -1;
 298 }
 299
 300 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 301 {
 302         errno = ENOSYS;
 303         return -1;
 304 }
 305
 306 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 307 {
 308         errno = ENOSYS;
 309         return -1;
 310 }
 311
 312 void init_gpfs(void)
 313 {
 314         return;
 315 }
 316
 317 #endif /* HAVE_GPFS */