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 "smbd/smbd.h"
  22
  23 #ifdef HAVE_GPFS
  24
  25 #include "libcli/security/security.h"
  26 #include "gpfs_gpl.h"
  27 #include "vfs_gpfs.h"
  28
  29 static bool gpfs_getrealfilename;
  30 static bool gpfs_winattr;
  31 static bool gpfs_do_ftruncate;
  32
  33 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  34 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  35 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  36 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  37 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  38                                             int *buflen);
  39 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
  40 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
  41 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  42 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
  43 static int (*gpfs_lib_init_fn)(int flags);
  44
  45 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  46                         uint32 share_access)
  47 {
  48         unsigned int allow = GPFS_SHARE_NONE;
  49         unsigned int deny = GPFS_DENY_NONE;
  50         int result;
  51
  52         if (gpfs_set_share_fn == NULL) {
  53                 return False;
  54         }
  55
  56         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  57                 /* No real file, don't disturb */
  58                 return True;
  59         }
  60
  61         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  62                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  63         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  64                 GPFS_SHARE_READ : 0;
  65
  66         if (allow == GPFS_SHARE_NONE) {
  67                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  68         }
  69         else {
  70                 deny |= (share_access & FILE_SHARE_WRITE) ?
  71                         0 : GPFS_DENY_WRITE;
  72                 deny |= (share_access & (FILE_SHARE_READ)) ?
  73                         0 : GPFS_DENY_READ;
  74         }
  75         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  76                    access_mask, allow, share_access, deny));
  77
  78         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  79         if (result != 0) {
  80                 if (errno == ENOSYS) {
  81                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  82                                   "support has been compiled into Samba. Allowing access\n"));
  83                         return True;
  84                 } else {
  85                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  86                                    strerror(errno)));
  87                 }
  88         }
  89
  90         return (result == 0);
  91 }
  92
  93 int set_gpfs_lease(int fd, int leasetype)
  94 {
  95         int gpfs_type = GPFS_LEASE_NONE;
  96
  97         if (gpfs_set_lease_fn == NULL) {
  98                 errno = EINVAL;
  99                 return -1;
 100         }
 101
 102         if (leasetype == F_RDLCK) {
 103                 gpfs_type = GPFS_LEASE_READ;
 104         }
 105         if (leasetype == F_WRLCK) {
 106                 gpfs_type = GPFS_LEASE_WRITE;
 107         }
 108
 109         /* we unconditionally set CAP_LEASE, rather than looking for
 110            -1/EACCES as there is a bug in some versions of
 111            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 112            each time we try this with the wrong capabilities set
 113         */
 114         linux_set_lease_capability();
 115         return gpfs_set_lease_fn(fd, gpfs_type);
 116 }
 117
 118 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 119 {
 120         if (gpfs_getacl_fn == NULL) {
 121                 errno = ENOSYS;
 122                 return -1;
 123         }
 124
 125         return gpfs_getacl_fn(pathname, flags, acl);
 126 }
 127
 128 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 129 {
 130         if (gpfs_putacl_fn == NULL) {
 131                 errno = ENOSYS;
 132                 return -1;
 133         }
 134
 135         return gpfs_putacl_fn(pathname, flags, acl);
 136 }
 137
 138 int smbd_gpfs_ftruncate(int fd, gpfs_off64_t length)
 139 {
 140         if (!gpfs_do_ftruncate || (gpfs_ftruncate_fn == NULL)) {
 141                 errno = ENOSYS;
 142                 return -1;
 143         }
 144
 145         return gpfs_ftruncate_fn(fd, length);
 146 }
 147
 148 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 149                                     int *buflen)
 150 {
 151         if ((!gpfs_getrealfilename)
 152             || (gpfs_get_realfilename_path_fn == NULL)) {
 153                 errno = ENOSYS;
 154                 return -1;
 155         }
 156
 157         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 158 }
 159
 160 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 161 {
 162
 163         if ((!gpfs_winattr) || (gpfs_get_winattrs_path_fn == NULL)) {
 164                 errno = ENOSYS;
 165                 return -1;
 166         }
 167         DEBUG(10, ("gpfs_get_winattrs_path:open call %s\n",pathname));
 168         return gpfs_get_winattrs_path_fn(pathname, attrs);
 169 }
 170
 171 int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
 172 {
 173
 174         if ((!gpfs_winattr) || (gpfs_get_winattrs_fn == NULL)) {
 175                 errno = ENOSYS;
 176                 return -1;
 177         }
 178         DEBUG(10, ("gpfs_get_winattrs_path:open call %d\n", fd));
 179         return gpfs_get_winattrs_fn(fd, attrs);
 180 }
 181
 182 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 183 {
 184         if ((!gpfs_winattr) || (gpfs_set_winattrs_path_fn == NULL)) {
 185                 errno = ENOSYS;
 186                 return -1;
 187         }
 188
 189         DEBUG(10, ("gpfs_set_winattrs_path:open call %s\n",pathname));
 190         return gpfs_set_winattrs_path_fn(pathname,flags, attrs);
 191 }
 192
 193 void smbd_gpfs_lib_init()
 194 {
 195         if (gpfs_lib_init_fn) {
 196                 int rc = gpfs_lib_init_fn(0);
 197                 DEBUG(10, ("gpfs_lib_init() finished with rc %d "
 198                            "and errno %d\n", rc, errno));
 199         } else {
 200                 DEBUG(10, ("libgpfs lacks gpfs_lib_init\n"));
 201         }
 202 }
 203
 204 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 205                                    const char *libname,
 206                                    void *pfn_pointer, const char *fn_name)
 207 {
 208         bool did_open_here = false;
 209         void **libhandle_pointer = (void **)plibhandle_pointer;
 210         void **fn_pointer = (void **)pfn_pointer;
 211
 212         DEBUG(10, ("trying to load name %s from %s\n",
 213                    fn_name, libname));
 214
 215         if (*libhandle_pointer == NULL) {
 216                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 217                 did_open_here = true;
 218         }
 219         if (*libhandle_pointer == NULL) {
 220                 DEBUG(10, ("Could not open lib %s\n", libname));
 221                 return false;
 222         }
 223
 224         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 225         if (*fn_pointer == NULL) {
 226                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 227                            fn_name, libname));
 228                 if (did_open_here) {
 229                         dlclose(*libhandle_pointer);
 230                         *libhandle_pointer = NULL;
 231                 }
 232                 return false;
 233         }
 234
 235         return true;
 236 }
 237
 238 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 239 {
 240         static void *libgpfs_handle = NULL;
 241         static void *libgpfs_gpl_handle = NULL;
 242
 243         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 244                                    fn_pointer, fn_name)) {
 245                 return true;
 246         }
 247         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 248                                    fn_pointer, fn_name)) {
 249                 return true;
 250         }
 251         return false;
 252 }
 253
 254 void init_gpfs(void)
 255 {
 256         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 257         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 258         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 259         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 260         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 261                            "gpfs_get_realfilename_path");
 262         init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
 263         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
 264         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
 265         init_gpfs_function(&gpfs_ftruncate_fn, "gpfs_ftruncate");
 266         init_gpfs_function(&gpfs_lib_init_fn,"gpfs_lib_init");
 267
 268         gpfs_getrealfilename = lp_parm_bool(-1, "gpfs", "getrealfilename",
 269                                             True);
 270         gpfs_winattr = lp_parm_bool(-1, "gpfs", "winattr", False);
 271         gpfs_do_ftruncate = lp_parm_bool(-1, "gpfs", "ftruncate", True);
 272
 273         return;
 274 }
 275
 276 #else
 277
 278 int set_gpfs_lease(int snum, int leasetype)
 279 {
 280         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 281
 282         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 283          * that the normal linux kernel oplock code is called. */
 284         errno = ENOSYS;
 285         return -1;
 286 }
 287
 288 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 289                         uint32 share_access)
 290 {
 291         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 292         /* Don't disturb but complain */
 293         return True;
 294 }
 295
 296 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 297 {
 298         errno = ENOSYS;
 299         return -1;
 300 }
 301
 302 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 303 {
 304         errno = ENOSYS;
 305         return -1;
 306 }
 307
 308 int smbd_gpfs_get_realfilename_path(char *pathname, char *fileamep,
 309                                     int *buflen)
 310 {
 311         errno = ENOSYS;
 312         return -1;
 313 }
 314
 315 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 316 {
 317         errno = ENOSYS;
 318         return -1;
 319 }
 320
 321 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 322 {
 323         errno = ENOSYS;
 324         return -1;
 325 }
 326
 327 void smbd_gpfs_lib_init()
 328 {
 329         return;
 330 }
 331
 332 void init_gpfs(void)
 333 {
 334         return;
 335 }
 336
 337 #endif /* HAVE_GPFS */