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