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