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-rw-r--r--source4/ntvfs/sysdep/config.m410
-rw-r--r--source4/ntvfs/sysdep/config.mk10
-rw-r--r--source4/ntvfs/sysdep/sys_lease_linux.c213
3 files changed, 233 insertions, 0 deletions
diff --git a/source4/ntvfs/sysdep/config.m4 b/source4/ntvfs/sysdep/config.m4
index f70cac5e64..6de75a4294 100644
--- a/source4/ntvfs/sysdep/config.m4
+++ b/source4/ntvfs/sysdep/config.m4
@@ -11,3 +11,13 @@ fi
if test x"$ac_cv_header_linux_inotify_h" = x"yes" -a x"$ac_cv_have___NR_inotify_init_decl" = x"yes"; then
SMB_ENABLE(sys_notify_inotify, YES)
fi
+
+AC_HAVE_DECL(F_SETLEASE, [#include <fcntl.h>])
+AC_HAVE_DECL(SA_SIGINFO, [#include <signal.h>])
+
+SMB_ENABLE(sys_lease_linux, NO)
+
+if test x"$ac_cv_have_F_SETLEASE_decl" = x"yes" \
+ -a x"$ac_cv_have_SA_SIGINFO_decl" = x"yes"; then
+ SMB_ENABLE(sys_lease_linux, YES)
+fi
diff --git a/source4/ntvfs/sysdep/config.mk b/source4/ntvfs/sysdep/config.mk
index 753c8833a4..048226efad 100644
--- a/source4/ntvfs/sysdep/config.mk
+++ b/source4/ntvfs/sysdep/config.mk
@@ -18,6 +18,16 @@ PUBLIC_DEPENDENCIES =
################################################
################################################
+# Start MODULE sys_lease_linux
+[MODULE::sys_lease_linux]
+SUBSYSTEM = sys_lease
+INIT_FUNCTION = sys_lease_linux_init
+OBJ_FILES = \
+ sys_lease_linux.o
+# End MODULE sys_lease_linux
+################################################
+
+################################################
# Start SUBSYSTEM sys_lease
[SUBSYSTEM::sys_lease]
OBJ_FILES = \
diff --git a/source4/ntvfs/sysdep/sys_lease_linux.c b/source4/ntvfs/sysdep/sys_lease_linux.c
new file mode 100644
index 0000000000..0727eed212
--- /dev/null
+++ b/source4/ntvfs/sysdep/sys_lease_linux.c
@@ -0,0 +1,213 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ Copyright (C) Stefan Metzmacher 2008
+
+ 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/>.
+*/
+
+/*
+ lease (oplock) implementation using fcntl F_SETLEASE on linux
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "lib/events/events.h"
+#include "ntvfs/sysdep/sys_lease.h"
+#include "ntvfs/ntvfs.h"
+#include "librpc/gen_ndr/ndr_opendb.h"
+#include "lib/util/dlinklist.h"
+#include "cluster/cluster.h"
+
+#define LINUX_LEASE_RT_SIGNAL (SIGRTMIN+1)
+
+struct linux_lease_pending {
+ struct linux_lease_pending *prev, *next;
+ struct sys_lease_context *ctx;
+ struct opendb_entry e;
+};
+
+/* the global linked list of pending leases */
+static struct linux_lease_pending *leases;
+
+static void linux_lease_signal_handler(struct event_context *ev_ctx,
+ struct signal_event *se,
+ int signum, int count,
+ void *_info, void *private_data)
+{
+ struct sys_lease_context *ctx = talloc_get_type(private_data,
+ struct sys_lease_context);
+ siginfo_t *info = (siginfo_t *)_info;
+ struct linux_lease_pending *c;
+ int got_fd = info->si_fd;
+
+ for (c = leases; c; c = c->next) {
+ int *fd = (int *)c->e.fd;
+
+ if (got_fd == *fd) {
+ break;
+ }
+ }
+
+ if (!c) {
+ return;
+ }
+
+ ctx->break_send(ctx->msg_ctx, &c->e, OPLOCK_BREAK_TO_NONE);
+}
+
+static int linux_lease_pending_destructor(struct linux_lease_pending *p)
+{
+ int ret;
+ int *fd = (int *)p->e.fd;
+
+ DLIST_REMOVE(leases, p);
+
+ if (*fd == -1) {
+ return 0;
+ }
+
+ ret = fcntl(*fd, F_SETLEASE, F_UNLCK);
+ if (ret == -1) {
+ DEBUG(0,("%s: failed to remove oplock: %s\n",
+ __FUNCTION__, strerror(errno)));
+ }
+
+ return 0;
+}
+
+static NTSTATUS linux_lease_init(struct sys_lease_context *ctx)
+{
+ struct signal_event *se;
+
+ se = event_add_signal(ctx->event_ctx, ctx,
+ LINUX_LEASE_RT_SIGNAL, SA_SIGINFO,
+ linux_lease_signal_handler, ctx);
+ NT_STATUS_HAVE_NO_MEMORY(se);
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS linux_lease_setup(struct sys_lease_context *ctx,
+ struct opendb_entry *e)
+{
+ int ret;
+ int *fd = (int *)e->fd;
+ struct linux_lease_pending *p;
+
+ if (e->oplock_level == OPLOCK_NONE) {
+ e->fd = NULL;
+ return NT_STATUS_OK;
+ } else if (e->oplock_level == OPLOCK_LEVEL_II) {
+ /*
+ * the linux kernel doesn't support level2 oplocks
+ * so fix up the granted oplock level
+ */
+ e->oplock_level = OPLOCK_NONE;
+ e->allow_level_II_oplock = false;
+ e->fd = NULL;
+ return NT_STATUS_OK;
+ }
+
+ p = talloc(ctx, struct linux_lease_pending);
+ NT_STATUS_HAVE_NO_MEMORY(p);
+
+ p->ctx = ctx;
+ p->e = *e;
+
+ ret = fcntl(*fd, F_SETSIG, LINUX_LEASE_RT_SIGNAL);
+ if (ret == -1) {
+ talloc_free(p);
+ return map_nt_error_from_unix(errno);
+ }
+
+ ret = fcntl(*fd, F_SETLEASE, F_WRLCK);
+ if (ret == -1) {
+ talloc_free(p);
+ return map_nt_error_from_unix(errno);
+ }
+
+ DLIST_ADD(leases, p);
+
+ talloc_set_destructor(p, linux_lease_pending_destructor);
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS linux_lease_remove(struct sys_lease_context *ctx,
+ struct opendb_entry *e);
+
+static NTSTATUS linux_lease_update(struct sys_lease_context *ctx,
+ struct opendb_entry *e)
+{
+ struct linux_lease_pending *c;
+
+ for (c = leases; c; c = c->next) {
+ if (c->e.fd == e->fd) {
+ break;
+ }
+ }
+
+ if (!c) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ /*
+ * set the fd pointer to NULL so that the caller
+ * will not call the remove function as the oplock
+ * is already removed
+ */
+ e->fd = NULL;
+
+ talloc_free(c);
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS linux_lease_remove(struct sys_lease_context *ctx,
+ struct opendb_entry *e)
+{
+ struct linux_lease_pending *c;
+
+ for (c = leases; c; c = c->next) {
+ if (c->e.fd == e->fd) {
+ break;
+ }
+ }
+
+ if (!c) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ talloc_free(c);
+
+ return NT_STATUS_OK;
+}
+
+static struct sys_lease_ops linux_lease_ops = {
+ .name = "linux",
+ .init = linux_lease_init,
+ .setup = linux_lease_setup,
+ .update = linux_lease_update,
+ .remove = linux_lease_remove
+};
+
+/*
+ initialialise the linux lease module
+ */
+NTSTATUS sys_lease_linux_init(void)
+{
+ /* register ourselves as a system lease module */
+ return sys_lease_register(&linux_lease_ops);
+}
generated by cgit (git 2.34.1) at 2024-12-02 08:20:07 +0000