1 files changed, 236 insertions, 0 deletions
diff --git a/source3/modules/gpfs.c b/source3/modules/gpfs.c
new file mode 100644
index 0000000000..590dbac26f
--- /dev/null
+++ b/source3/modules/gpfs.c
@@ -0,0 +1,236 @@
+/* 
+ *  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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+
+#ifdef HAVE_GPFS
+
+#include "gpfs_gpl.h"
+#include "vfs_gpfs.h"
+
+static void *libgpfs_handle = NULL;
+static bool gpfs_share_modes;
+static bool gpfs_leases;
+
+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);
+static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
+static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
+
+
+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_share_modes) {
+		return True;
+	}
+	
+	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;
+
+	if (allow == GPFS_SHARE_NONE) {
+		DEBUG(10, ("special case am=no_access:%x\n",access_mask));
+	}
+	else {	
+		deny |= (share_access & FILE_SHARE_WRITE) ?
+			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, ("VFS module vfs_gpfs loaded, but no gpfs "
+				  "support has been compiled into Samba. 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_leases) {
+		return True;
+	}
+
+	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;
+	}
+	
+	/* we unconditionally set CAP_LEASE, rather than looking for
+	   -1/EACCES as there is a bug in some versions of
+	   libgpfs_gpl.so which results in a leaked fd on /dev/ss0
+	   each time we try this with the wrong capabilities set
+	*/
+	linux_set_lease_capability();
+	return gpfs_set_lease_fn(fd, gpfs_type);
+}
+
+int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
+{
+	if (gpfs_getacl_fn == NULL) {
+		errno = ENOSYS;
+		return -1;
+	}
+
+	return gpfs_getacl_fn(pathname, flags, acl);
+}
+
+int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
+{
+	if (gpfs_putacl_fn == NULL) {
+		errno = ENOSYS;
+		return -1;
+	}
+
+	return gpfs_putacl_fn(pathname, flags, acl);
+}
+
+void init_gpfs(void)
+{
+	if (libgpfs_handle != NULL) {
+		return;
+	}
+
+	libgpfs_handle = sys_dlopen("libgpfs_gpl.so", RTLD_LAZY);
+
+	if (libgpfs_handle == NULL) {
+		DEBUG(10, ("sys_dlopen for libgpfs_gpl failed: %s\n",
+			   strerror(errno)));
+		return;
+	}
+
+	DEBUG(10, ("libgpfs_gpl.so loaded\n"));
+
+	gpfs_set_share_fn = sys_dlsym(libgpfs_handle, "gpfs_set_share");
+	if (gpfs_set_share_fn == NULL) {
+		DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
+			  "'gpfs_set_share'\n"));
+		goto failed;
+	}
+
+	gpfs_set_lease_fn = sys_dlsym(libgpfs_handle, "gpfs_set_lease");
+	if (gpfs_set_lease_fn == NULL) {
+		DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
+			  "'gpfs_set_lease'\n"));
+		sys_dlclose(libgpfs_handle);
+
+		goto failed;
+	}
+
+	gpfs_getacl_fn = sys_dlsym(libgpfs_handle, "gpfs_getacl");
+	if (gpfs_getacl_fn == NULL) {
+		DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
+			  "'gpfs_getacl'\n"));
+		goto failed;
+	}
+
+	gpfs_putacl_fn = sys_dlsym(libgpfs_handle, "gpfs_putacl");
+	if (gpfs_putacl_fn == NULL) {
+		DEBUG(3, ("libgpfs_gpl.so does not contain the symbol "
+			  "'gpfs_putacl'\n"));
+		goto failed;
+	}
+
+	gpfs_share_modes = lp_parm_bool(-1, "gpfs", "sharemodes", True);
+	gpfs_leases      = lp_parm_bool(-1, "gpfs", "leases", True);
+
+	return;
+
+failed:
+	sys_dlclose(libgpfs_handle);
+	/* leave libgpfs_handle != NULL around, no point
+	   in trying twice */
+	gpfs_set_share_fn = NULL;
+	gpfs_set_lease_fn = NULL;
+	gpfs_getacl_fn = NULL;
+	gpfs_putacl_fn = NULL;
+}
+
+#else
+
+int set_gpfs_lease(int snum, int leasetype)
+{
+	DEBUG(0, ("'VFS module smbgpfs loaded, 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, ("VFS module - smbgpfs.so loaded, without gpfs support compiled\n"));
+	/* Don't disturb but complain */
+	return True;
+}
+
+int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
+{
+	errno = ENOSYS;
+	return -1;
+}
+
+int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
+{
+	errno = ENOSYS;
+	return -1;
+}
+
+void init_gpfs(void)
+{
+	return;
+}
+
+#endif /* HAVE_GPFS */