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