[dm-devel] [PATCH 1/4] dm-netlink: Add dm-netlink skeleton
Mike Anderson
andmike at us.ibm.com
Tue Jan 9 09:31:31 UTC 2007
From: Mike Anderson <andmike at us.ibm.com>
This patch adds a dm-netlink skeleton support to the Makefile, and the dm
directory.
Signed-off-by: Mike Anderson <andmike at us.ibm.com>
---
drivers/md/Kconfig | 5 ++
drivers/md/Makefile | 4 ++
drivers/md/dm-netlink.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/md/dm-netlink.h | 42 +++++++++++++++++++++
drivers/md/dm.c | 2 +
drivers/md/dm.h | 1
include/linux/netlink.h | 2 -
7 files changed, 151 insertions(+), 1 deletion(-)
Index: linux-2.6-patched/drivers/md/dm-netlink.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6-patched/drivers/md/dm-netlink.c 2007-01-09 01:11:57.000000000 -0800
@@ -0,0 +1,96 @@
+/*
+ * Device Mapper Netlink Support (dm-netlink)
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2005, 2006
+ * Author: Mike Anderson <andmike at us.ibm.com>
+ */
+#include <linux/module.h>
+#include <linux/mempool.h>
+#include <linux/time.h>
+#include <linux/jiffies.h>
+#include <linux/security.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include "dm.h"
+
+#define EVENT_SKB_SIZE NLMSG_GOODSIZE
+
+struct dm_event_cache {
+ struct kmem_cache *cache;
+ unsigned skb_size;
+};
+
+static struct dm_event_cache dme_cache;
+
+static int dme_cache_init(struct dm_event_cache *dc, unsigned skb_size)
+{
+ dc->skb_size = skb_size;
+
+ dc->cache = kmem_cache_create("dm_events",
+ sizeof(struct dm_event), 0, 0, NULL, NULL);
+
+ if (!dc->cache)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void dme_cache_destroy(struct dm_event_cache *dc)
+{
+ kmem_cache_destroy(dc->cache);
+}
+
+static void dme_cache_event_put(struct dm_event *evt)
+{
+ struct dm_event_cache *dc = evt->cdata;
+ kmem_cache_free(dc->cache, evt);
+}
+
+static struct dm_event* dme_cache_event_get(struct dm_event_cache *dc)
+{
+ struct dm_event *evt;
+
+ evt = kmem_cache_alloc(dc->cache, GFP_ATOMIC);
+ if (evt) {
+ evt->cdata = dc;
+ evt->skb = alloc_skb(dc->skb_size, GFP_ATOMIC);
+ if (!evt->skb)
+ goto cache_out;
+ }
+
+ return evt;
+
+cache_out:
+ dme_cache_event_put(evt);
+ return NULL;
+}
+
+int __init dm_netlink_init(void)
+{
+ int err;
+
+ err = dme_cache_init(&dme_cache, EVENT_SKB_SIZE);
+ if (!err)
+ printk(KERN_DEBUG "dm-netlink version 0.0.6 loaded\n");
+
+ return err;
+}
+
+void dm_netlink_exit(void)
+{
+ dme_cache_destroy(&dme_cache);
+}
Index: linux-2.6-patched/include/linux/netlink.h
===================================================================
--- linux-2.6-patched.orig/include/linux/netlink.h 2007-01-09 01:11:44.000000000 -0800
+++ linux-2.6-patched/include/linux/netlink.h 2007-01-09 01:11:57.000000000 -0800
@@ -21,7 +21,7 @@
#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
#define NETLINK_GENERIC 16
-/* leave room for NETLINK_DM (DM Events) */
+#define NETLINK_DM 17 /* Device Mapper */
#define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */
#define MAX_LINKS 32
Index: linux-2.6-patched/drivers/md/Makefile
===================================================================
--- linux-2.6-patched.orig/drivers/md/Makefile 2007-01-09 01:11:44.000000000 -0800
+++ linux-2.6-patched/drivers/md/Makefile 2007-01-09 01:11:57.000000000 -0800
@@ -45,6 +45,10 @@
altivec_flags := -maltivec -mabi=altivec
endif
+ifeq ($(CONFIG_DM_NETLINK_EVENT),y)
+dm-mod-objs += dm-netlink.o
+endif
+
targets += raid6int1.c
$(obj)/raid6int1.c: UNROLL := 1
$(obj)/raid6int1.c: $(src)/raid6int.uc $(src)/unroll.pl FORCE
Index: linux-2.6-patched/drivers/md/Kconfig
===================================================================
--- linux-2.6-patched.orig/drivers/md/Kconfig 2007-01-09 01:11:44.000000000 -0800
+++ linux-2.6-patched/drivers/md/Kconfig 2007-01-09 01:11:57.000000000 -0800
@@ -262,6 +262,11 @@
---help---
Multipath support for EMC CX/AX series hardware.
+config DM_NETLINK_EVENT
+ bool "DM netlink events (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && EXPERIMENTAL
+ ---help---
+ Generate netlink events for DM events.
endmenu
endif
Index: linux-2.6-patched/drivers/md/dm-netlink.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6-patched/drivers/md/dm-netlink.h 2007-01-09 01:11:57.000000000 -0800
@@ -0,0 +1,42 @@
+/*
+ * Device Mapper Netlink Support
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2005, 2006
+ * Author: Mike Anderson <andmike at us.ibm.com>
+ */
+#ifndef DM_NETLINK_H
+#define DM_NETLINK_H
+
+struct dm_event {
+ void *cdata;
+ struct sk_buff *skb;
+ struct list_head elist;
+};
+
+#ifdef CONFIG_DM_NETLINK_EVENT
+int dm_netlink_init(void);
+void dm_netlink_exit(void);
+#else
+static inline int __init dm_netlink_init(void)
+{
+ return 0;
+}
+static inline void dm_netlink_exit(void)
+{ }
+#endif
+
+#endif /* DM_NETLINK_H */
Index: linux-2.6-patched/drivers/md/dm.c
===================================================================
--- linux-2.6-patched.orig/drivers/md/dm.c 2007-01-09 01:11:44.000000000 -0800
+++ linux-2.6-patched/drivers/md/dm.c 2007-01-09 01:11:57.000000000 -0800
@@ -178,6 +178,7 @@
dm_linear_init,
dm_stripe_init,
dm_interface_init,
+ dm_netlink_init,
};
void (*_exits[])(void) = {
@@ -186,6 +187,7 @@
dm_linear_exit,
dm_stripe_exit,
dm_interface_exit,
+ dm_netlink_exit,
};
static int __init dm_init(void)
Index: linux-2.6-patched/drivers/md/dm.h
===================================================================
--- linux-2.6-patched.orig/drivers/md/dm.h 2007-01-09 01:11:44.000000000 -0800
+++ linux-2.6-patched/drivers/md/dm.h 2007-01-09 01:11:57.000000000 -0800
@@ -15,6 +15,7 @@
#include <linux/list.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
+#include "dm-netlink.h"
#define DM_NAME "device-mapper"
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