Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
cifs: Register generic netlink family
Register a new generic netlink family to talk to the witness service
userspace daemon.
Signed-off-by: Samuel Cabrero <scabrero@suse.de>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
authored by
Samuel Cabrero
and committed by
Steve French
06f08dab
047092ff
+145
-1
+11
fs/cifs/Kconfig
+11
fs/cifs/Kconfig
···
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servers if their addresses change or for implicit mounts of
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DFS junction points. If unsure, say Y.
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config CIFS_SWN_UPCALL
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bool "SWN feature support"
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depends on CIFS
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help
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The Service Witness Protocol (SWN) is used to get notifications
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from a highly available server of resource state changes. This
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feature enables an upcall mechanism for CIFS which contacts an
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userspace daemon to establish the DCE/RPC connection to retrieve
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the cluster available interfaces and resource change notifications.
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If unsure, say Y.
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config CIFS_NFSD_EXPORT
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bool "Allow nfsd to export CIFS file system"
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depends on CIFS && BROKEN
+2
fs/cifs/Makefile
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fs/cifs/Makefile
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-1
fs/cifs/cifsfs.c
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-1
fs/cifs/cifsfs.c
···
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#ifdef CONFIG_CIFS_DFS_UPCALL
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#include "dfs_cache.h"
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#endif
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#ifdef CONFIG_CIFS_SWN_UPCALL
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#include "netlink.h"
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#endif
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#include "fs_context.h"
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/*
···
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if (rc)
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goto out_destroy_dfs_cache;
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#endif /* CONFIG_CIFS_UPCALL */
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#ifdef CONFIG_CIFS_SWN_UPCALL
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rc = cifs_genl_init();
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if (rc)
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goto out_register_key_type;
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#endif /* CONFIG_CIFS_SWN_UPCALL */
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rc = init_cifs_idmap();
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if (rc)
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-
goto out_register_key_type;
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goto out_cifs_swn_init;
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rc = register_filesystem(&cifs_fs_type);
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if (rc)
···
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out_init_cifs_idmap:
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exit_cifs_idmap();
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out_cifs_swn_init:
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#ifdef CONFIG_CIFS_SWN_UPCALL
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cifs_genl_exit();
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out_register_key_type:
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#endif
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#ifdef CONFIG_CIFS_UPCALL
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exit_cifs_spnego();
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out_destroy_dfs_cache:
···
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unregister_filesystem(&smb3_fs_type);
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cifs_dfs_release_automount_timer();
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exit_cifs_idmap();
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#ifdef CONFIG_CIFS_SWN_UPCALL
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cifs_genl_exit();
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#endif
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#ifdef CONFIG_CIFS_UPCALL
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exit_cifs_spnego();
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#endif
+69
fs/cifs/netlink.c
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fs/cifs/netlink.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Netlink routines for CIFS
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*
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* Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
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*/
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#include <net/genetlink.h>
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#include <uapi/linux/cifs/cifs_netlink.h>
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#include "netlink.h"
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#include "cifsglob.h"
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#include "cifs_debug.h"
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static const struct nla_policy cifs_genl_policy[CIFS_GENL_ATTR_MAX + 1] = {
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};
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static struct genl_ops cifs_genl_ops[] = {
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};
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static const struct genl_multicast_group cifs_genl_mcgrps[] = {
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[CIFS_GENL_MCGRP_SWN] = { .name = CIFS_GENL_MCGRP_SWN_NAME },
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};
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struct genl_family cifs_genl_family = {
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.name = CIFS_GENL_NAME,
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.version = CIFS_GENL_VERSION,
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.hdrsize = 0,
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.maxattr = CIFS_GENL_ATTR_MAX,
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.module = THIS_MODULE,
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.policy = cifs_genl_policy,
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.ops = cifs_genl_ops,
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.n_ops = ARRAY_SIZE(cifs_genl_ops),
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.mcgrps = cifs_genl_mcgrps,
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.n_mcgrps = ARRAY_SIZE(cifs_genl_mcgrps),
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};
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/**
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* cifs_genl_init - Register generic netlink family
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*
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* Return zero if initialized successfully, otherwise non-zero.
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*/
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int cifs_genl_init(void)
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{
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int ret;
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ret = genl_register_family(&cifs_genl_family);
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if (ret < 0) {
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cifs_dbg(VFS, "%s: failed to register netlink family\n",
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__func__);
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return ret;
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}
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return 0;
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}
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/**
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* cifs_genl_exit - Unregister generic netlink family
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*/
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void cifs_genl_exit(void)
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{
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int ret;
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ret = genl_unregister_family(&cifs_genl_family);
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if (ret < 0) {
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cifs_dbg(VFS, "%s: failed to unregister netlink family\n",
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__func__);
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}
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}
+16
fs/cifs/netlink.h
+16
fs/cifs/netlink.h
···
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Netlink routines for CIFS
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*
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* Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
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*/
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#ifndef _CIFS_NETLINK_H
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#define _CIFS_NETLINK_H
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extern struct genl_family cifs_genl_family;
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extern int cifs_genl_init(void);
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extern void cifs_genl_exit(void);
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#endif /* _CIFS_NETLINK_H */
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include/uapi/linux/cifs/cifs_netlink.h
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include/uapi/linux/cifs/cifs_netlink.h
···
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/* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */
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/*
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* Netlink routines for CIFS
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*
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* Copyright (c) 2020 Samuel Cabrero <scabrero@suse.de>
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*/
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#ifndef _UAPILINUX_CIFS_NETLINK_H
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#define _UAPILINUX_CIFS_NETLINK_H
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#define CIFS_GENL_NAME "cifs"
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#define CIFS_GENL_VERSION 0x1
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#define CIFS_GENL_MCGRP_SWN_NAME "cifs_mcgrp_swn"
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enum cifs_genl_multicast_groups {
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CIFS_GENL_MCGRP_SWN,
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};
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enum cifs_genl_attributes {
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__CIFS_GENL_ATTR_MAX,
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};
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#define CIFS_GENL_ATTR_MAX (__CIFS_GENL_ATTR_MAX - 1)
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enum cifs_genl_commands {
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__CIFS_GENL_CMD_MAX
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};
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#define CIFS_GENL_CMD_MAX (__CIFS_GENL_CMD_MAX - 1)
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#endif /* _UAPILINUX_CIFS_NETLINK_H */