From: Samuel Cabrero <scabrero@suse.de>
To: linux-cifs@vger.kernel.org
Cc: Samuel Cabrero <scabrero@suse.de>
Subject: [PATCH v4 03/11] cifs: Register generic netlink family
Date: Mon, 30 Nov 2020 19:02:49 +0100 [thread overview]
Message-ID: <20201130180257.31787-4-scabrero@suse.de> (raw)
In-Reply-To: <20201130180257.31787-1-scabrero@suse.de>
Register a new generic netlink family to talk to the witness service
userspace daemon.
Signed-off-by: Samuel Cabrero <scabrero@suse.de>
---
fs/cifs/Kconfig | 11 ++++
fs/cifs/Makefile | 2 +
fs/cifs/cifsfs.c | 17 ++++++-
fs/cifs/netlink.c | 69 ++++++++++++++++++++++++++
fs/cifs/netlink.h | 16 ++++++
include/uapi/linux/cifs/cifs_netlink.h | 31 ++++++++++++
6 files changed, 145 insertions(+), 1 deletion(-)
create mode 100644 fs/cifs/netlink.c
create mode 100644 fs/cifs/netlink.h
create mode 100644 include/uapi/linux/cifs/cifs_netlink.h
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index 604f65f4b6c5..664ac5c63d39 100644
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -190,6 +190,17 @@ config CIFS_DFS_UPCALL
servers if their addresses change or for implicit mounts of
DFS junction points. If unsure, say Y.
+config CIFS_SWN_UPCALL
+ bool "SWN feature support"
+ depends on CIFS
+ help
+ The Service Witness Protocol (SWN) is used to get notifications
+ from a highly available server of resource state changes. This
+ feature enables an upcall mechanism for CIFS which contacts an
+ userspace daemon to establish the DCE/RPC connection to retrieve
+ the cluster available interfaces and resource change notifications.
+ If unsure, say Y.
+
config CIFS_NFSD_EXPORT
bool "Allow nfsd to export CIFS file system"
depends on CIFS && BROKEN
diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
index cd17d0e50f2a..b88fd46ac597 100644
--- a/fs/cifs/Makefile
+++ b/fs/cifs/Makefile
@@ -18,6 +18,8 @@ cifs-$(CONFIG_CIFS_UPCALL) += cifs_spnego.o
cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o dfs_cache.o
+cifs-$(CONFIG_CIFS_SWN_UPCALL) += netlink.o
+
cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
cifs-$(CONFIG_CIFS_SMB_DIRECT) += smbdirect.o
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 472cb7777e3e..8111d0109a2e 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -55,6 +55,9 @@
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
+#ifdef CONFIG_CIFS_SWN_UPCALL
+#include "netlink.h"
+#endif
/*
* DOS dates from 1980/1/1 through 2107/12/31
@@ -1617,10 +1620,15 @@ init_cifs(void)
if (rc)
goto out_destroy_dfs_cache;
#endif /* CONFIG_CIFS_UPCALL */
+#ifdef CONFIG_CIFS_SWN_UPCALL
+ rc = cifs_genl_init();
+ if (rc)
+ goto out_register_key_type;
+#endif /* CONFIG_CIFS_SWN_UPCALL */
rc = init_cifs_idmap();
if (rc)
- goto out_register_key_type;
+ goto out_cifs_swn_init;
rc = register_filesystem(&cifs_fs_type);
if (rc)
@@ -1636,7 +1644,11 @@ init_cifs(void)
out_init_cifs_idmap:
exit_cifs_idmap();
+out_cifs_swn_init:
+#ifdef CONFIG_CIFS_SWN_UPCALL
+ cifs_genl_exit();
out_register_key_type:
+#endif
#ifdef CONFIG_CIFS_UPCALL
exit_cifs_spnego();
out_destroy_dfs_cache:
@@ -1673,6 +1685,9 @@ exit_cifs(void)
unregister_filesystem(&smb3_fs_type);
cifs_dfs_release_automount_timer();
exit_cifs_idmap();
+#ifdef CONFIG_CIFS_SWN_UPCALL
+ cifs_genl_exit();
+#endif
#ifdef CONFIG_CIFS_UPCALL
exit_cifs_spnego();
#endif
diff --git a/fs/cifs/netlink.c b/fs/cifs/netlink.c
new file mode 100644
index 000000000000..b9154661fa85
--- /dev/null
+++ b/fs/cifs/netlink.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Netlink routines for CIFS
+ *
+ * Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
+ */
+
+#include <net/genetlink.h>
+#include <uapi/linux/cifs/cifs_netlink.h>
+
+#include "netlink.h"
+#include "cifsglob.h"
+#include "cifs_debug.h"
+
+static const struct nla_policy cifs_genl_policy[CIFS_GENL_ATTR_MAX + 1] = {
+};
+
+static struct genl_ops cifs_genl_ops[] = {
+};
+
+static const struct genl_multicast_group cifs_genl_mcgrps[] = {
+ [CIFS_GENL_MCGRP_SWN] = { .name = CIFS_GENL_MCGRP_SWN_NAME },
+};
+
+struct genl_family cifs_genl_family = {
+ .name = CIFS_GENL_NAME,
+ .version = CIFS_GENL_VERSION,
+ .hdrsize = 0,
+ .maxattr = CIFS_GENL_ATTR_MAX,
+ .module = THIS_MODULE,
+ .policy = cifs_genl_policy,
+ .ops = cifs_genl_ops,
+ .n_ops = ARRAY_SIZE(cifs_genl_ops),
+ .mcgrps = cifs_genl_mcgrps,
+ .n_mcgrps = ARRAY_SIZE(cifs_genl_mcgrps),
+};
+
+/**
+ * cifs_genl_init - Register generic netlink family
+ *
+ * Return zero if initialized successfully, otherwise non-zero.
+ */
+int cifs_genl_init(void)
+{
+ int ret;
+
+ ret = genl_register_family(&cifs_genl_family);
+ if (ret < 0) {
+ cifs_dbg(VFS, "%s: failed to register netlink family\n",
+ __func__);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * cifs_genl_exit - Unregister generic netlink family
+ */
+void cifs_genl_exit(void)
+{
+ int ret;
+
+ ret = genl_unregister_family(&cifs_genl_family);
+ if (ret < 0) {
+ cifs_dbg(VFS, "%s: failed to unregister netlink family\n",
+ __func__);
+ }
+}
diff --git a/fs/cifs/netlink.h b/fs/cifs/netlink.h
new file mode 100644
index 000000000000..e2fa8ed24c54
--- /dev/null
+++ b/fs/cifs/netlink.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Netlink routines for CIFS
+ *
+ * Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
+ */
+
+#ifndef _CIFS_NETLINK_H
+#define _CIFS_NETLINK_H
+
+extern struct genl_family cifs_genl_family;
+
+extern int cifs_genl_init(void);
+extern void cifs_genl_exit(void);
+
+#endif /* _CIFS_NETLINK_H */
diff --git a/include/uapi/linux/cifs/cifs_netlink.h b/include/uapi/linux/cifs/cifs_netlink.h
new file mode 100644
index 000000000000..cdb1bd78fbc7
--- /dev/null
+++ b/include/uapi/linux/cifs/cifs_netlink.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */
+/*
+ * Netlink routines for CIFS
+ *
+ * Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
+ */
+
+
+#ifndef _UAPILINUX_CIFS_NETLINK_H
+#define _UAPILINUX_CIFS_NETLINK_H
+
+#define CIFS_GENL_NAME "cifs"
+#define CIFS_GENL_VERSION 0x1
+
+#define CIFS_GENL_MCGRP_SWN_NAME "cifs_mcgrp_swn"
+
+enum cifs_genl_multicast_groups {
+ CIFS_GENL_MCGRP_SWN,
+};
+
+enum cifs_genl_attributes {
+ __CIFS_GENL_ATTR_MAX,
+};
+#define CIFS_GENL_ATTR_MAX (__CIFS_GENL_ATTR_MAX - 1)
+
+enum cifs_genl_commands {
+ __CIFS_GENL_CMD_MAX
+};
+#define CIFS_GENL_CMD_MAX (__CIFS_GENL_CMD_MAX - 1)
+
+#endif /* _UAPILINUX_CIFS_NETLINK_H */
--
2.29.2
next prev parent reply other threads:[~2020-11-30 18:04 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-30 18:02 [PATCH v4 00/11] Witness protocol support for transparent failover Samuel Cabrero
2020-11-30 18:02 ` [PATCH v4 01/11] cifs: Make extract_hostname function public Samuel Cabrero
2020-12-12 3:42 ` Steve French
2020-11-30 18:02 ` [PATCH v4 02/11] cifs: Make extract_sharename " Samuel Cabrero
2020-12-12 5:50 ` Steve French
2020-11-30 18:02 ` Samuel Cabrero [this message]
2020-12-12 5:51 ` [PATCH v4 03/11] cifs: Register generic netlink family Steve French
2020-11-30 18:02 ` [PATCH v4 04/11] cifs: add witness mount option and data structs Samuel Cabrero
2020-12-12 5:07 ` Steve French
2020-11-30 18:02 ` [PATCH v4 05/11] cifs: Send witness register and unregister commands to userspace daemon Samuel Cabrero
2020-12-12 5:52 ` Steve French
2020-11-30 18:02 ` [PATCH v4 06/11] cifs: Set witness notification handler for messages from " Samuel Cabrero
2020-12-12 5:55 ` Steve French
2020-11-30 18:02 ` [PATCH v4 07/11] cifs: Add witness information to debug data dump Samuel Cabrero
2020-12-12 5:57 ` Steve French
2020-11-30 18:02 ` [PATCH v4 08/11] cifs: Send witness register messages to userspace daemon in echo task Samuel Cabrero
2020-12-12 6:00 ` Steve French
2020-11-30 18:02 ` [PATCH v4 09/11] cifs: Simplify reconnect code when dfs upcall is enabled Samuel Cabrero
2020-12-12 6:07 ` Steve French
2020-11-30 18:02 ` [PATCH v4 10/11] cifs: Handle witness client move notification Samuel Cabrero
2020-11-30 18:02 ` [PATCH v4 11/11] cifs: Handle witness share moved notification Samuel Cabrero
2020-12-09 12:36 ` [PATCH v4 00/11] Witness protocol support for transparent failover Aurélien Aptel
2020-12-09 15:06 ` Paulo Alcantara
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201130180257.31787-4-scabrero@suse.de \
--to=scabrero@suse.de \
--cc=linux-cifs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).