source/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_share_modes;
  28 static bool gpfs_leases;
  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
  35
  36 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  37                         uint32 share_access)
  38 {
  39         unsigned int allow = GPFS_SHARE_NONE;
  40         unsigned int deny = GPFS_DENY_NONE;
  41         int result;
  42
  43         if (!gpfs_share_modes) {
  44                 return True;
  45         }
  46
  47         if (gpfs_set_share_fn == NULL) {
  48                 return False;
  49         }
  50
  51         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  52                 /* No real file, don't disturb */
  53                 return True;
  54         }
  55
  56         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  57                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  58         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  59                 GPFS_SHARE_READ : 0;
  60
  61         if (allow == GPFS_SHARE_NONE) {
  62                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  63         }
  64         else {
  65                 deny |= (share_access & FILE_SHARE_WRITE) ?
  66                         0 : GPFS_DENY_WRITE;
  67                 deny |= (share_access & (FILE_SHARE_READ)) ?
  68                         0 : GPFS_DENY_READ;
  69         }
  70         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  71                    access_mask, allow, share_access, deny));
  72
  73         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  74         if (result != 0) {
  75                 if (errno == ENOSYS) {
  76                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  77                                   "support has been compiled into Samba. Allowing access\n"));
  78                         return True;
  79                 } else {
  80                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  81                                    strerror(errno)));
  82                 }
  83         }
  84
  85         return (result == 0);
  86 }
  87
  88 int set_gpfs_lease(int fd, int leasetype)
  89 {
  90         int gpfs_type = GPFS_LEASE_NONE;
  91
  92         if (!gpfs_leases) {
  93                 return True;
  94         }
  95
  96         if (gpfs_set_lease_fn == NULL) {
  97                 errno = EINVAL;
  98                 return -1;
  99         }
 100
 101         if (leasetype == F_RDLCK) {
 102                 gpfs_type = GPFS_LEASE_READ;
 103         }
 104         if (leasetype == F_WRLCK) {
 105                 gpfs_type = GPFS_LEASE_WRITE;
 106         }
 107
 108         /* we unconditionally set CAP_LEASE, rather than looking for
 109            -1/EACCES as there is a bug in some versions of
 110            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 111            each time we try this with the wrong capabilities set
 112         */
 113         linux_set_lease_capability();
 114         return gpfs_set_lease_fn(fd, gpfs_type);
 115 }
 116
 117 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 118 {
 119         if (gpfs_getacl_fn == NULL) {
 120                 errno = ENOSYS;
 121                 return -1;
 122         }
 123
 124         return gpfs_getacl_fn(pathname, flags, acl);
 125 }
 126
 127 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 128 {
 129         if (gpfs_putacl_fn == NULL) {
 130                 errno = ENOSYS;
 131                 return -1;
 132         }
 133
 134         return gpfs_putacl_fn(pathname, flags, acl);
 135 }
 136
 137 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 138                                    const char *libname,
 139                                    void *pfn_pointer, const char *fn_name)
 140 {
 141         bool did_open_here = false;
 142         void **libhandle_pointer = (void **)plibhandle_pointer;
 143         void **fn_pointer = (void **)pfn_pointer;
 144
 145         if (*libhandle_pointer == NULL) {
 146                 *libhandle_pointer = sys_dlopen(libname, RTLD_LAZY);
 147                 did_open_here = true;
 148         }
 149         if (*libhandle_pointer == NULL) {
 150                 DEBUG(10, ("Could not open lib %s\n", libname));
 151                 return false;
 152         }
 153
 154         *fn_pointer = sys_dlsym(*libhandle_pointer, fn_name);
 155         if (*fn_pointer == NULL) {
 156                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 157                            fn_name, libname));
 158                 if (did_open_here) {
 159                         sys_dlclose(*libhandle_pointer);
 160                         *libhandle_pointer = NULL;
 161                 }
 162                 return false;
 163         }
 164
 165         return true;
 166 }
 167
 168 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 169 {
 170         static void *libgpfs_handle = NULL;
 171         static void *libgpfs_gpl_handle = NULL;
 172
 173         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 174                                    fn_pointer, fn_name)) {
 175                 return true;
 176         }
 177         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 178                                    fn_pointer, fn_name)) {
 179                 return true;
 180         }
 181         return false;
 182 }
 183
 184 void init_gpfs(void)
 185 {
 186         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 187         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 188         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 189         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 190
 191         gpfs_share_modes = lp_parm_bool(-1, "gpfs", "sharemodes", True);
 192         gpfs_leases      = lp_parm_bool(-1, "gpfs", "leases", True);
 193
 194         return;
 195 }
 196
 197 #else
 198
 199 int set_gpfs_lease(int snum, int leasetype)
 200 {
 201         DEBUG(0, ("'VFS module smbgpfs loaded, without gpfs support compiled\n"));
 202
 203         /* We need to indicate that no GPFS is around by returning ENOSYS, so
 204          * that the normal linux kernel oplock code is called. */
 205         errno = ENOSYS;
 206         return -1;
 207 }
 208
 209 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 210                         uint32 share_access)
 211 {
 212         DEBUG(0, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
 213         /* Don't disturb but complain */
 214         return True;
 215 }
 216
 217 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 218 {
 219         errno = ENOSYS;
 220         return -1;
 221 }
 222
 223 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 224 {
 225         errno = ENOSYS;
 226         return -1;
 227 }
 228
 229 void init_gpfs(void)
 230 {
 231         return;
 232 }
 233
 234 #endif /* HAVE_GPFS */