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 #include "system/filesys.h"
  22 #include "smbd/smbd.h"
  23
  24 #ifdef HAVE_GPFS
  25
  26 #include "libcli/security/security.h"
  27 #include "gpfs_gpl.h"
  28 #include "vfs_gpfs.h"
  29
  30 static bool gpfs_getrealfilename;
  31 static bool gpfs_winattr;
  32 static bool gpfs_do_ftruncate;
  33
  34 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  35 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  36 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  37 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  38 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  39                                             int *buflen);
  40 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
  41 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
  42 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  43 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
  44 static int (*gpfs_lib_init_fn)(int flags);
  45
  46 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  47                         uint32 share_access)
  48 {
  49         unsigned int allow = GPFS_SHARE_NONE;
  50         unsigned int deny = GPFS_DENY_NONE;
  51         int result;
  52
  53         if (gpfs_set_share_fn == NULL) {
  54                 return False;
  55         }
  56
  57         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  58                 /* No real file, don't disturb */
  59                 return True;
  60         }
  61
  62         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  63                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  64         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  65                 GPFS_SHARE_READ : 0;
  66
  67         if (allow == GPFS_SHARE_NONE) {
  68                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  69         }
  70         else {
  71                 deny |= (share_access & FILE_SHARE_WRITE) ?
  72                         0 : GPFS_DENY_WRITE;
  73                 deny |= (share_access & (FILE_SHARE_READ)) ?
  74                         0 : GPFS_DENY_READ;
  75         }
  76         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  77                    access_mask, allow, share_access, deny));
  78
  79         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  80         if (result != 0) {
  81                 if (errno == ENOSYS) {
  82                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  83                                   "support has been compiled into Samba. Allowing access\n"));
  84                         return True;
  85                 } else {
  86                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  87                                    strerror(errno)));
  88                 }
  89         }
  90
  91         return (result == 0);
  92 }
  93
  94 int set_gpfs_lease(int fd, int leasetype)
  95 {
  96         int gpfs_type = GPFS_LEASE_NONE;
  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_ftruncate(int fd, gpfs_off64_t length)
 140 {
 141         if (!gpfs_do_ftruncate || (gpfs_ftruncate_fn == NULL)) {
 142                 errno = ENOSYS;
 143                 return -1;
 144         }
 145
 146         return gpfs_ftruncate_fn(fd, length);
 147 }
 148
 149 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 150                                     int *buflen)
 151 {
 152         if ((!gpfs_getrealfilename)
 153             || (gpfs_get_realfilename_path_fn == NULL)) {
 154                 errno = ENOSYS;
 155                 return -1;
 156         }
 157
 158         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 159 }
 160
 161 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 162 {
 163
 164         if ((!gpfs_winattr) || (gpfs_get_winattrs_path_fn == NULL)) {
 165                 errno = ENOSYS;
 166                 return -1;
 167         }
 168         DEBUG(10, ("gpfs_get_winattrs_path:open call %s\n",pathname));
 169         return gpfs_get_winattrs_path_fn(pathname, attrs);
 170 }
 171
 172 int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
 173 {
 174
 175         if ((!gpfs_winattr) || (gpfs_get_winattrs_fn == NULL)) {
 176                 errno = ENOSYS;
 177                 return -1;
 178         }
 179         DEBUG(10, ("gpfs_get_winattrs_path:open call %d\n", fd));
 180         return gpfs_get_winattrs_fn(fd, attrs);
 181 }
 182
 183 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 184 {
 185         if ((!gpfs_winattr) || (gpfs_set_winattrs_path_fn == NULL)) {
 186                 errno = ENOSYS;
 187                 return -1;
 188         }
 189
 190         DEBUG(10, ("gpfs_set_winattrs_path:open call %s\n",pathname));
 191         return gpfs_set_winattrs_path_fn(pathname,flags, attrs);
 192 }
 193
 194 void smbd_gpfs_lib_init()
 195 {
 196         if (gpfs_lib_init_fn) {
 197                 int rc = gpfs_lib_init_fn(0);
 198                 DEBUG(10, ("gpfs_lib_init() finished with rc %d "
 199                            "and errno %d\n", rc, errno));
 200         } else {
 201                 DEBUG(10, ("libgpfs lacks gpfs_lib_init\n"));
 202         }
 203 }
 204
 205 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 206                                    const char *libname,
 207                                    void *pfn_pointer, const char *fn_name)
 208 {
 209         bool did_open_here = false;
 210         void **libhandle_pointer = (void **)plibhandle_pointer;
 211         void **fn_pointer = (void **)pfn_pointer;
 212
 213         DEBUG(10, ("trying to load name %s from %s\n",
 214                    fn_name, libname));
 215
 216         if (*libhandle_pointer == NULL) {
 217                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 218                 did_open_here = true;
 219         }
 220         if (*libhandle_pointer == NULL) {
 221                 DEBUG(10, ("Could not open lib %s\n", libname));
 222                 return false;
 223         }
 224
 225         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 226         if (*fn_pointer == NULL) {
 227                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 228                            fn_name, libname));
 229                 if (did_open_here) {
 230                         dlclose(*libhandle_pointer);
 231                         *libhandle_pointer = NULL;
 232                 }
 233                 return false;
 234         }
 235
 236         return true;
 237 }
 238
 239 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 240 {
 241         static void *libgpfs_handle = NULL;
 242         static void *libgpfs_gpl_handle = NULL;
 243
 244         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 245                                    fn_pointer, fn_name)) {
 246                 return true;
 247         }
 248         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 249                                    fn_pointer, fn_name)) {
 250                 return true;
 251         }
 252         return false;
 253 }
 254
 255 void init_gpfs(void)
 256 {
 257         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 258         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 259         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 260         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 261         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 262                            "gpfs_get_realfilename_path");
 263         init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
 264         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
 265         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
 266         init_gpfs_function(&gpfs_ftruncate_fn, "gpfs_ftruncate");
 267         init_gpfs_function(&gpfs_lib_init_fn,"gpfs_lib_init");
 268
 269         gpfs_getrealfilename = lp_parm_bool(-1, "gpfs", "getrealfilename",
 270                                             True);
 271         gpfs_winattr = lp_parm_bool(-1, "gpfs", "winattr", False);
 272         gpfs_do_ftruncate = lp_parm_bool(-1, "gpfs", "ftruncate", True);
 273
 274         return;
 275 }
 276
 277 #else
 278
 279 int set_gpfs_lease(int snum, int leasetype)
 280 {
 281         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 282
 283         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 284          * that the normal linux kernel oplock code is called. */
 285         errno = ENOSYS;
 286         return -1;
 287 }
 288
 289 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 290                         uint32 share_access)
 291 {
 292         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 293         /* Don't disturb but complain */
 294         return True;
 295 }
 296
 297 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 298 {
 299         errno = ENOSYS;
 300         return -1;
 301 }
 302
 303 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 304 {
 305         errno = ENOSYS;
 306         return -1;
 307 }
 308
 309 int smbd_gpfs_get_realfilename_path(char *pathname, char *fileamep,
 310                                     int *buflen)
 311 {
 312         errno = ENOSYS;
 313         return -1;
 314 }
 315
 316 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 317 {
 318         errno = ENOSYS;
 319         return -1;
 320 }
 321
 322 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 323 {
 324         errno = ENOSYS;
 325         return -1;
 326 }
 327
 328 void smbd_gpfs_lib_init()
 329 {
 330         return;
 331 }
 332
 333 void init_gpfs(void)
 334 {
 335         return;
 336 }
 337
 338 #endif /* HAVE_GPFS */