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/*
* Unix SMB/CIFS implementation.
* Provide a connection to GPFS specific features
* Copyright (C) Volker Lendecke 2005
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#ifdef HAVE_GPFS_SET_SHARE
#include "gpfs.h"
static void *libgpfs_handle = NULL;
static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
BOOL set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
uint32 share_access)
{
unsigned int allow = GPFS_SHARE_NONE;
unsigned int deny = GPFS_DENY_NONE;
int result;
if (gpfs_set_share_fn == NULL) {
return False;
}
if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
/* No real file, don't disturb */
return True;
}
allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
GPFS_SHARE_READ : 0;
deny |= (share_access & (FILE_SHARE_WRITE|FILE_SHARE_DELETE)) ?
0 : GPFS_DENY_WRITE;
deny |= (share_access & (FILE_SHARE_READ)) ?
0 : GPFS_DENY_READ;
DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
access_mask, allow, share_access, deny));
result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
if (result != 0) {
if (errno == ENOSYS) {
DEBUG(5, ("'gpfs share = yes' set, but no gpfs "
"available. Allowing access\n"));
return True;
} else {
DEBUG(10, ("gpfs_set_share failed: %s\n",
strerror(errno)));
}
}
return (result == 0);
}
int set_gpfs_lease(int fd, int leasetype)
{
int gpfs_type = GPFS_LEASE_NONE;
if (gpfs_set_lease_fn == NULL) {
errno = EINVAL;
return -1;
}
if (leasetype == F_RDLCK) {
gpfs_type = GPFS_LEASE_READ;
}
if (leasetype == F_WRLCK) {
gpfs_type = GPFS_LEASE_WRITE;
}
return gpfs_set_lease_fn(fd, gpfs_type);
}
void init_gpfs(void)
{
if (libgpfs_handle != NULL) {
return;
}
libgpfs_handle = sys_dlopen("libgpfs.so", RTLD_LAZY);
if (libgpfs_handle == NULL) {
DEBUG(10, ("sys_dlopen for libgpfs.so failed: %s\n",
strerror(errno)));
return;
}
DEBUG(10, ("libgpfs.so loaded\n"));
gpfs_set_share_fn = sys_dlsym(libgpfs_handle, "gpfs_set_share");
if (gpfs_set_share_fn == NULL) {
DEBUG(3, ("libgpfs.so does not contain the symbol "
"'gpfs_set_share'\n"));
sys_dlclose(libgpfs_handle);
/* leave libgpfs_handle != NULL around, no point
in trying twice */
gpfs_set_lease_fn = NULL;
return;
}
gpfs_set_lease_fn = sys_dlsym(libgpfs_handle, "gpfs_set_lease");
if (gpfs_set_lease_fn == NULL) {
DEBUG(3, ("libgpfs.so does not contain the symbol "
"'gpfs_set_lease'\n"));
sys_dlclose(libgpfs_handle);
/* leave libgpfs_handle != NULL around, no point
in trying twice */
gpfs_set_share_fn = NULL;
return;
}
}
#else
int set_gpfs_lease(int snum, int leasetype)
{
DEBUG(0, ("'gpfs share = yes' set without gpfs support compiled\n"));
/* We need to indicate that no GPFS is around by returning ENOSYS, so
* that the normal linux kernel oplock code is called. */
errno = ENOSYS;
return -1;
}
BOOL set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
uint32 share_access)
{
DEBUG(0, ("'gpfs share = yes' set without gpfs support compiled\n"));
/* Don't disturb but complain */
return True;
}
void init_gpfs(void)
{
return;
}
#endif
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