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_getrealfilename;
  28 static bool gpfs_winattr;
  29 static bool gpfs_do_ftruncate;
  30
  31 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  32 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  33 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  34 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  35 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  36                                             int *buflen);
  37 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
  38 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
  39 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  40 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
  41
  42 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  43                         uint32 share_access)
  44 {
  45         unsigned int allow = GPFS_SHARE_NONE;
  46         unsigned int deny = GPFS_DENY_NONE;
  47         int result;
  48
  49         if (gpfs_set_share_fn == NULL) {
  50                 return False;
  51         }
  52
  53         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  54                 /* No real file, don't disturb */
  55                 return True;
  56         }
  57
  58         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  59                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  60         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  61                 GPFS_SHARE_READ : 0;
  62
  63         if (allow == GPFS_SHARE_NONE) {
  64                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  65         }
  66         else {
  67                 deny |= (share_access & FILE_SHARE_WRITE) ?
  68                         0 : GPFS_DENY_WRITE;
  69                 deny |= (share_access & (FILE_SHARE_READ)) ?
  70                         0 : GPFS_DENY_READ;
  71         }
  72         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  73                    access_mask, allow, share_access, deny));
  74
  75         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  76         if (result != 0) {
  77                 if (errno == ENOSYS) {
  78                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  79                                   "support has been compiled into Samba. Allowing access\n"));
  80                         return True;
  81                 } else {
  82                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  83                                    strerror(errno)));
  84                 }
  85         }
  86
  87         return (result == 0);
  88 }
  89
  90 int set_gpfs_lease(int fd, int leasetype)
  91 {
  92         int gpfs_type = GPFS_LEASE_NONE;
  93
  94         if (gpfs_set_lease_fn == NULL) {
  95                 errno = EINVAL;
  96                 return -1;
  97         }
  98
  99         if (leasetype == F_RDLCK) {
 100                 gpfs_type = GPFS_LEASE_READ;
 101         }
 102         if (leasetype == F_WRLCK) {
 103                 gpfs_type = GPFS_LEASE_WRITE;
 104         }
 105
 106         /* we unconditionally set CAP_LEASE, rather than looking for
 107            -1/EACCES as there is a bug in some versions of
 108            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 109            each time we try this with the wrong capabilities set
 110         */
 111         linux_set_lease_capability();
 112         return gpfs_set_lease_fn(fd, gpfs_type);
 113 }
 114
 115 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 116 {
 117         if (gpfs_getacl_fn == NULL) {
 118                 errno = ENOSYS;
 119                 return -1;
 120         }
 121
 122         return gpfs_getacl_fn(pathname, flags, acl);
 123 }
 124
 125 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 126 {
 127         if (gpfs_putacl_fn == NULL) {
 128                 errno = ENOSYS;
 129                 return -1;
 130         }
 131
 132         return gpfs_putacl_fn(pathname, flags, acl);
 133 }
 134
 135 int smbd_gpfs_ftrunctate(int fd, gpfs_off64_t length)
 136 {
 137        if (!gpfs_do_ftruncate || (gpfs_ftruncate_fn == NULL)) {
 138                errno = ENOSYS;
 139                return -1;
 140        }
 141
 142        return gpfs_ftruncate_fn(fd, length);
 143 }
 144
 145 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 146                                     int *buflen)
 147 {
 148         if ((!gpfs_getrealfilename)
 149             || (gpfs_get_realfilename_path_fn == NULL)) {
 150                 errno = ENOSYS;
 151                 return -1;
 152         }
 153
 154         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 155 }
 156
 157 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 158 {
 159
 160         if ((!gpfs_winattr) || (gpfs_get_winattrs_path_fn == NULL)) {
 161                 errno = ENOSYS;
 162                 return -1;
 163         }
 164         DEBUG(10, ("gpfs_get_winattrs_path:open call %s\n",pathname));
 165         return gpfs_get_winattrs_path_fn(pathname, attrs);
 166 }
 167
 168 int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
 169 {
 170
 171         if ((!gpfs_winattr) || (gpfs_get_winattrs_fn == NULL)) {
 172                 errno = ENOSYS;
 173                 return -1;
 174         }
 175         DEBUG(10, ("gpfs_get_winattrs_path:open call %d\n", fd));
 176         return gpfs_get_winattrs_fn(fd, attrs);
 177 }
 178
 179 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 180 {
 181         if ((!gpfs_winattr) || (gpfs_set_winattrs_path_fn == NULL)) {
 182                 errno = ENOSYS;
 183                 return -1;
 184         }
 185
 186         DEBUG(10, ("gpfs_set_winattrs_path:open call %s\n",pathname));
 187         return gpfs_set_winattrs_path_fn(pathname,flags, attrs);
 188 }
 189
 190 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 191                                    const char *libname,
 192                                    void *pfn_pointer, const char *fn_name)
 193 {
 194         bool did_open_here = false;
 195         void **libhandle_pointer = (void **)plibhandle_pointer;
 196         void **fn_pointer = (void **)pfn_pointer;
 197
 198         DEBUG(10, ("trying to load name %s from %s\n",
 199                    fn_name, libname));
 200
 201         if (*libhandle_pointer == NULL) {
 202                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 203                 did_open_here = true;
 204         }
 205         if (*libhandle_pointer == NULL) {
 206                 DEBUG(10, ("Could not open lib %s\n", libname));
 207                 return false;
 208         }
 209
 210         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 211         if (*fn_pointer == NULL) {
 212                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 213                            fn_name, libname));
 214                 if (did_open_here) {
 215                         dlclose(*libhandle_pointer);
 216                         *libhandle_pointer = NULL;
 217                 }
 218                 return false;
 219         }
 220
 221         return true;
 222 }
 223
 224 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 225 {
 226         static void *libgpfs_handle = NULL;
 227         static void *libgpfs_gpl_handle = NULL;
 228
 229         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 230                                    fn_pointer, fn_name)) {
 231                 return true;
 232         }
 233         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 234                                    fn_pointer, fn_name)) {
 235                 return true;
 236         }
 237         return false;
 238 }
 239
 240 void init_gpfs(void)
 241 {
 242         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 243         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 244         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 245         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 246         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 247                            "gpfs_get_realfilename_path");
 248         init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
 249         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
 250         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
 251         init_gpfs_function(&gpfs_ftruncate_fn,"gpfs_ftruncate");
 252
 253         gpfs_getrealfilename = lp_parm_bool(-1, "gpfs", "getrealfilename",
 254                                             True);
 255         gpfs_winattr = lp_parm_bool(-1, "gpfs", "winattr", False);
 256
 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 */