From patchwork Tue Oct 27 10:08:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Cabrero X-Patchwork-Id: 11859825 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A37DC388F9 for ; Tue, 27 Oct 2020 10:08:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BFDBD2225C for ; Tue, 27 Oct 2020 10:08:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2897395AbgJ0KIc (ORCPT ); Tue, 27 Oct 2020 06:08:32 -0400 Received: from mx2.suse.de ([195.135.220.15]:59564 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2897388AbgJ0KIb (ORCPT ); Tue, 27 Oct 2020 06:08:31 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D7B43AEE6 for ; Tue, 27 Oct 2020 10:08:29 +0000 (UTC) From: Samuel Cabrero To: linux-cifs@vger.kernel.org Cc: Samuel Cabrero Subject: [PATCH v2 06/11] cifs: Set witness notification handler for messages from userspace daemon Date: Tue, 27 Oct 2020 11:08:02 +0100 Message-Id: <20201027100807.21510-7-scabrero@suse.de> X-Mailer: git-send-email 2.29.0 In-Reply-To: <20201027100807.21510-1-scabrero@suse.de> References: <20201027100807.21510-1-scabrero@suse.de> Reply-To: scabrero@suse.de MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org + Set a handler for the witness notification messages received from the userspace daemon. + Handle the resource state change notification. When the resource becomes unavailable or available set the tcp status to CifsNeedReconnect for all channels. Signed-off-by: Samuel Cabrero --- fs/cifs/cifs_swn.c | 86 ++++++++++++++++++++++++++ fs/cifs/cifs_swn.h | 4 ++ fs/cifs/netlink.c | 9 +++ include/uapi/linux/cifs/cifs_netlink.h | 17 +++++ 4 files changed, 116 insertions(+) diff --git a/fs/cifs/cifs_swn.c b/fs/cifs/cifs_swn.c index c7d70e28341e..501d84893262 100644 --- a/fs/cifs/cifs_swn.c +++ b/fs/cifs/cifs_swn.c @@ -379,6 +379,92 @@ static void cifs_put_swn_reg(struct cifs_swn_reg *swnreg) mutex_unlock(&cifs_swnreg_idr_mutex); } +static int cifs_swn_resource_state_changed(struct cifs_swn_reg *swnreg, const char *name, int state) +{ + int i; + + switch (state) { + case CIFS_SWN_RESOURCE_STATE_UNAVAILABLE: + cifs_dbg(FYI, "%s: resource name '%s' become unavailable\n", __func__, name); + for (i = 0; i < swnreg->tcon->ses->chan_count; i++) { + spin_lock(&GlobalMid_Lock); + if (swnreg->tcon->ses->chans[i].server->tcpStatus != CifsExiting) + swnreg->tcon->ses->chans[i].server->tcpStatus = CifsNeedReconnect; + spin_unlock(&GlobalMid_Lock); + } + break; + case CIFS_SWN_RESOURCE_STATE_AVAILABLE: + cifs_dbg(FYI, "%s: resource name '%s' become available\n", __func__, name); + for (i = 0; i < swnreg->tcon->ses->chan_count; i++) { + spin_lock(&GlobalMid_Lock); + if (swnreg->tcon->ses->chans[i].server->tcpStatus != CifsExiting) + swnreg->tcon->ses->chans[i].server->tcpStatus = CifsNeedReconnect; + spin_unlock(&GlobalMid_Lock); + } + break; + case CIFS_SWN_RESOURCE_STATE_UNKNOWN: + cifs_dbg(FYI, "%s: resource name '%s' changed to unknown state\n", __func__, name); + break; + } + return 0; +} + +int cifs_swn_notify(struct sk_buff *skb, struct genl_info *info) +{ + struct cifs_swn_reg *swnreg; + char name[256]; + int type; + + if (info->attrs[CIFS_GENL_ATTR_SWN_REGISTRATION_ID]) { + int swnreg_id; + + swnreg_id = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_REGISTRATION_ID]); + mutex_lock(&cifs_swnreg_idr_mutex); + swnreg = idr_find(&cifs_swnreg_idr, swnreg_id); + mutex_unlock(&cifs_swnreg_idr_mutex); + if (swnreg == NULL) { + cifs_dbg(FYI, "%s: registration id %d not found\n", __func__, swnreg_id); + return -EINVAL; + } + } else { + cifs_dbg(FYI, "%s: missing registration id attribute\n", __func__); + return -EINVAL; + } + + if (info->attrs[CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE]) { + type = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE]); + } else { + cifs_dbg(FYI, "%s: missing notification type attribute\n", __func__); + return -EINVAL; + } + + switch (type) { + case CIFS_SWN_NOTIFICATION_RESOURCE_CHANGE: { + int state; + + if (info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_NAME]) { + nla_strlcpy(name, info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_NAME], + sizeof(name)); + } else { + cifs_dbg(FYI, "%s: missing resource name attribute\n", __func__); + return -EINVAL; + } + if (info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_STATE]) { + state = nla_get_u32(info->attrs[CIFS_GENL_ATTR_SWN_RESOURCE_STATE]); + } else { + cifs_dbg(FYI, "%s: missing resource state attribute\n", __func__); + return -EINVAL; + } + return cifs_swn_resource_state_changed(swnreg, name, state); + } + default: + cifs_dbg(FYI, "%s: unknown notification type %d\n", __func__, type); + break; + } + + return 0; +} + int cifs_swn_register(struct cifs_tcon *tcon) { struct cifs_swn_reg *swnreg; diff --git a/fs/cifs/cifs_swn.h b/fs/cifs/cifs_swn.h index 69c7bd1035da..7ef9ecedbd05 100644 --- a/fs/cifs/cifs_swn.h +++ b/fs/cifs/cifs_swn.h @@ -9,9 +9,13 @@ #define _CIFS_SWN_H struct cifs_tcon; +struct sk_buff; +struct genl_info; extern int cifs_swn_register(struct cifs_tcon *tcon); extern int cifs_swn_unregister(struct cifs_tcon *tcon); +extern int cifs_swn_notify(struct sk_buff *skb, struct genl_info *info); + #endif /* _CIFS_SWN_H */ diff --git a/fs/cifs/netlink.c b/fs/cifs/netlink.c index 169ac4aacdbb..1b0862ac345b 100644 --- a/fs/cifs/netlink.c +++ b/fs/cifs/netlink.c @@ -10,6 +10,7 @@ #include "cifsglob.h" #include "cifs_debug.h" +#include "cifs_swn.h" static const struct nla_policy cifs_genl_policy[CIFS_GENL_ATTR_MAX + 1] = { [CIFS_GENL_ATTR_SWN_REGISTRATION_ID] = { .type = NLA_U32 }, @@ -23,9 +24,17 @@ static const struct nla_policy cifs_genl_policy[CIFS_GENL_ATTR_MAX + 1] = { [CIFS_GENL_ATTR_SWN_USER_NAME] = { .type = NLA_STRING }, [CIFS_GENL_ATTR_SWN_PASSWORD] = { .type = NLA_STRING }, [CIFS_GENL_ATTR_SWN_DOMAIN_NAME] = { .type = NLA_STRING }, + [CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE] = { .type = NLA_U32 }, + [CIFS_GENL_ATTR_SWN_RESOURCE_STATE] = { .type = NLA_U32 }, + [CIFS_GENL_ATTR_SWN_RESOURCE_NAME] = { .type = NLA_STRING}, }; static struct genl_ops cifs_genl_ops[] = { + { + .cmd = CIFS_GENL_CMD_SWN_NOTIFY, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .doit = cifs_swn_notify, + }, }; static const struct genl_multicast_group cifs_genl_mcgrps[] = { diff --git a/include/uapi/linux/cifs/cifs_netlink.h b/include/uapi/linux/cifs/cifs_netlink.h index 5662e2774513..da3107582f49 100644 --- a/include/uapi/linux/cifs/cifs_netlink.h +++ b/include/uapi/linux/cifs/cifs_netlink.h @@ -31,6 +31,9 @@ enum cifs_genl_attributes { CIFS_GENL_ATTR_SWN_USER_NAME, CIFS_GENL_ATTR_SWN_PASSWORD, CIFS_GENL_ATTR_SWN_DOMAIN_NAME, + CIFS_GENL_ATTR_SWN_NOTIFICATION_TYPE, + CIFS_GENL_ATTR_SWN_RESOURCE_STATE, + CIFS_GENL_ATTR_SWN_RESOURCE_NAME, __CIFS_GENL_ATTR_MAX, }; #define CIFS_GENL_ATTR_MAX (__CIFS_GENL_ATTR_MAX - 1) @@ -39,8 +42,22 @@ enum cifs_genl_commands { CIFS_GENL_CMD_UNSPEC, CIFS_GENL_CMD_SWN_REGISTER, CIFS_GENL_CMD_SWN_UNREGISTER, + CIFS_GENL_CMD_SWN_NOTIFY, __CIFS_GENL_CMD_MAX }; #define CIFS_GENL_CMD_MAX (__CIFS_GENL_CMD_MAX - 1) +enum cifs_swn_notification_type { + CIFS_SWN_NOTIFICATION_RESOURCE_CHANGE = 0x01, + CIFS_SWN_NOTIFICATION_CLIENT_MOVE = 0x02, + CIFS_SWN_NOTIFICATION_SHARE_MOVE = 0x03, + CIFS_SWN_NOTIFICATION_IP_CHANGE = 0x04, +}; + +enum cifs_swn_resource_state { + CIFS_SWN_RESOURCE_STATE_UNKNOWN = 0x00, + CIFS_SWN_RESOURCE_STATE_AVAILABLE = 0x01, + CIFS_SWN_RESOURCE_STATE_UNAVAILABLE = 0xFF +}; + #endif /* _UAPILINUX_CIFS_NETLINK_H */