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68e14569d7
Needed this for debugging a failing xfstest. Also change camel case for "treeName" to "tree_name" in tcon struct. Example trace output (from "trace-cmd record -e smb3_tdis*"): umount-9718 [006] ..... 5909.780244: smb3_tdis_enter: xid=206 sid=0xcf38894e tid=0x3d0b8cf8 path=\\localhost\test umount-9718 [007] ..... 5909.780878: smb3_tdis_done: xid=206 sid=0xcf38894e tid=0x3d0b8cf8 Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Steve French <stfrench@microsoft.com>
675 lines
17 KiB
C
675 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Witness Service client 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 <linux/kref.h>
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#include <net/genetlink.h>
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#include <uapi/linux/cifs/cifs_netlink.h>
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#include "cifs_swn.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "fscache.h"
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#include "cifs_debug.h"
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#include "netlink.h"
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static DEFINE_IDR(cifs_swnreg_idr);
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static DEFINE_MUTEX(cifs_swnreg_idr_mutex);
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struct cifs_swn_reg {
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int id;
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struct kref ref_count;
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const char *net_name;
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const char *share_name;
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bool net_name_notify;
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bool share_name_notify;
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bool ip_notify;
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struct cifs_tcon *tcon;
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};
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static int cifs_swn_auth_info_krb(struct cifs_tcon *tcon, struct sk_buff *skb)
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{
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int ret;
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ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_KRB_AUTH);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int cifs_swn_auth_info_ntlm(struct cifs_tcon *tcon, struct sk_buff *skb)
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{
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int ret;
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if (tcon->ses->user_name != NULL) {
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ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_USER_NAME, tcon->ses->user_name);
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if (ret < 0)
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return ret;
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}
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if (tcon->ses->password != NULL) {
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ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_PASSWORD, tcon->ses->password);
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if (ret < 0)
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return ret;
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}
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if (tcon->ses->domainName != NULL) {
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ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_DOMAIN_NAME, tcon->ses->domainName);
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if (ret < 0)
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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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* Sends a register message to the userspace daemon based on the registration.
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* The authentication information to connect to the witness service is bundled
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* into the message.
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*/
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static int cifs_swn_send_register_message(struct cifs_swn_reg *swnreg)
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{
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struct sk_buff *skb;
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struct genlmsghdr *hdr;
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enum securityEnum authtype;
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struct sockaddr_storage *addr;
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int ret;
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skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (skb == NULL) {
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ret = -ENOMEM;
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goto fail;
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}
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hdr = genlmsg_put(skb, 0, 0, &cifs_genl_family, 0, CIFS_GENL_CMD_SWN_REGISTER);
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if (hdr == NULL) {
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ret = -ENOMEM;
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goto nlmsg_fail;
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}
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ret = nla_put_u32(skb, CIFS_GENL_ATTR_SWN_REGISTRATION_ID, swnreg->id);
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if (ret < 0)
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goto nlmsg_fail;
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ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_NET_NAME, swnreg->net_name);
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if (ret < 0)
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goto nlmsg_fail;
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ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME, swnreg->share_name);
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if (ret < 0)
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goto nlmsg_fail;
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/*
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* If there is an address stored use it instead of the server address, because we are
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* in the process of reconnecting to it after a share has been moved or we have been
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* told to switch to it (client move message). In these cases we unregister from the
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* server address and register to the new address when we receive the notification.
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*/
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if (swnreg->tcon->ses->server->use_swn_dstaddr)
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addr = &swnreg->tcon->ses->server->swn_dstaddr;
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else
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addr = &swnreg->tcon->ses->server->dstaddr;
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ret = nla_put(skb, CIFS_GENL_ATTR_SWN_IP, sizeof(struct sockaddr_storage), addr);
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if (ret < 0)
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goto nlmsg_fail;
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if (swnreg->net_name_notify) {
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ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_NET_NAME_NOTIFY);
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if (ret < 0)
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goto nlmsg_fail;
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}
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if (swnreg->share_name_notify) {
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ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME_NOTIFY);
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if (ret < 0)
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goto nlmsg_fail;
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}
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if (swnreg->ip_notify) {
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ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_IP_NOTIFY);
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if (ret < 0)
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goto nlmsg_fail;
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}
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authtype = cifs_select_sectype(swnreg->tcon->ses->server, swnreg->tcon->ses->sectype);
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switch (authtype) {
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case Kerberos:
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ret = cifs_swn_auth_info_krb(swnreg->tcon, skb);
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if (ret < 0) {
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cifs_dbg(VFS, "%s: Failed to get kerberos auth info: %d\n", __func__, ret);
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goto nlmsg_fail;
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}
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break;
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case NTLMv2:
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case RawNTLMSSP:
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ret = cifs_swn_auth_info_ntlm(swnreg->tcon, skb);
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if (ret < 0) {
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cifs_dbg(VFS, "%s: Failed to get NTLM auth info: %d\n", __func__, ret);
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goto nlmsg_fail;
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}
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break;
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default:
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cifs_dbg(VFS, "%s: secType %d not supported!\n", __func__, authtype);
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ret = -EINVAL;
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goto nlmsg_fail;
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}
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genlmsg_end(skb, hdr);
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genlmsg_multicast(&cifs_genl_family, skb, 0, CIFS_GENL_MCGRP_SWN, GFP_ATOMIC);
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cifs_dbg(FYI, "%s: Message to register for network name %s with id %d sent\n", __func__,
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swnreg->net_name, swnreg->id);
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return 0;
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nlmsg_fail:
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genlmsg_cancel(skb, hdr);
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nlmsg_free(skb);
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fail:
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return ret;
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}
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/*
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* Sends an uregister message to the userspace daemon based on the registration
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*/
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static int cifs_swn_send_unregister_message(struct cifs_swn_reg *swnreg)
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{
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struct sk_buff *skb;
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struct genlmsghdr *hdr;
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int ret;
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skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (skb == NULL)
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return -ENOMEM;
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hdr = genlmsg_put(skb, 0, 0, &cifs_genl_family, 0, CIFS_GENL_CMD_SWN_UNREGISTER);
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if (hdr == NULL) {
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ret = -ENOMEM;
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goto nlmsg_fail;
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}
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ret = nla_put_u32(skb, CIFS_GENL_ATTR_SWN_REGISTRATION_ID, swnreg->id);
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if (ret < 0)
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goto nlmsg_fail;
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ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_NET_NAME, swnreg->net_name);
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if (ret < 0)
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goto nlmsg_fail;
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ret = nla_put_string(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME, swnreg->share_name);
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if (ret < 0)
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goto nlmsg_fail;
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ret = nla_put(skb, CIFS_GENL_ATTR_SWN_IP, sizeof(struct sockaddr_storage),
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&swnreg->tcon->ses->server->dstaddr);
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if (ret < 0)
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goto nlmsg_fail;
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if (swnreg->net_name_notify) {
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ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_NET_NAME_NOTIFY);
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if (ret < 0)
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goto nlmsg_fail;
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}
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if (swnreg->share_name_notify) {
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ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_SHARE_NAME_NOTIFY);
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if (ret < 0)
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goto nlmsg_fail;
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}
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if (swnreg->ip_notify) {
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ret = nla_put_flag(skb, CIFS_GENL_ATTR_SWN_IP_NOTIFY);
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if (ret < 0)
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goto nlmsg_fail;
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}
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genlmsg_end(skb, hdr);
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genlmsg_multicast(&cifs_genl_family, skb, 0, CIFS_GENL_MCGRP_SWN, GFP_ATOMIC);
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cifs_dbg(FYI, "%s: Message to unregister for network name %s with id %d sent\n", __func__,
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swnreg->net_name, swnreg->id);
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return 0;
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nlmsg_fail:
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genlmsg_cancel(skb, hdr);
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nlmsg_free(skb);
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return ret;
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}
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/*
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* Try to find a matching registration for the tcon's server name and share name.
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* Calls to this function must be protected by cifs_swnreg_idr_mutex.
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* TODO Try to avoid memory allocations
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*/
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static struct cifs_swn_reg *cifs_find_swn_reg(struct cifs_tcon *tcon)
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{
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struct cifs_swn_reg *swnreg;
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int id;
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const char *share_name;
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const char *net_name;
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net_name = extract_hostname(tcon->tree_name);
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if (IS_ERR(net_name)) {
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int ret;
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ret = PTR_ERR(net_name);
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cifs_dbg(VFS, "%s: failed to extract host name from target '%s': %d\n",
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__func__, tcon->tree_name, ret);
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return ERR_PTR(-EINVAL);
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}
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share_name = extract_sharename(tcon->tree_name);
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if (IS_ERR(share_name)) {
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int ret;
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ret = PTR_ERR(share_name);
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cifs_dbg(VFS, "%s: failed to extract share name from target '%s': %d\n",
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__func__, tcon->tree_name, ret);
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kfree(net_name);
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return ERR_PTR(-EINVAL);
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}
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idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
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if (strcasecmp(swnreg->net_name, net_name) != 0
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|| strcasecmp(swnreg->share_name, share_name) != 0) {
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continue;
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}
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cifs_dbg(FYI, "Existing swn registration for %s:%s found\n", swnreg->net_name,
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swnreg->share_name);
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kfree(net_name);
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kfree(share_name);
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return swnreg;
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}
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kfree(net_name);
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kfree(share_name);
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return ERR_PTR(-EEXIST);
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}
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/*
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* Get a registration for the tcon's server and share name, allocating a new one if it does not
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* exists
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*/
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static struct cifs_swn_reg *cifs_get_swn_reg(struct cifs_tcon *tcon)
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{
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struct cifs_swn_reg *reg = NULL;
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int ret;
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mutex_lock(&cifs_swnreg_idr_mutex);
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/* Check if we are already registered for this network and share names */
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reg = cifs_find_swn_reg(tcon);
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if (!IS_ERR(reg)) {
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kref_get(®->ref_count);
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mutex_unlock(&cifs_swnreg_idr_mutex);
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return reg;
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} else if (PTR_ERR(reg) != -EEXIST) {
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mutex_unlock(&cifs_swnreg_idr_mutex);
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return reg;
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}
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reg = kmalloc(sizeof(struct cifs_swn_reg), GFP_ATOMIC);
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if (reg == NULL) {
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mutex_unlock(&cifs_swnreg_idr_mutex);
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return ERR_PTR(-ENOMEM);
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}
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kref_init(®->ref_count);
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reg->id = idr_alloc(&cifs_swnreg_idr, reg, 1, 0, GFP_ATOMIC);
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if (reg->id < 0) {
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cifs_dbg(FYI, "%s: failed to allocate registration id\n", __func__);
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ret = reg->id;
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goto fail;
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}
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reg->net_name = extract_hostname(tcon->tree_name);
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if (IS_ERR(reg->net_name)) {
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ret = PTR_ERR(reg->net_name);
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cifs_dbg(VFS, "%s: failed to extract host name from target: %d\n", __func__, ret);
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goto fail_idr;
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}
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reg->share_name = extract_sharename(tcon->tree_name);
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if (IS_ERR(reg->share_name)) {
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ret = PTR_ERR(reg->share_name);
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cifs_dbg(VFS, "%s: failed to extract share name from target: %d\n", __func__, ret);
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goto fail_net_name;
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}
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reg->net_name_notify = true;
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reg->share_name_notify = true;
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reg->ip_notify = (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT);
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reg->tcon = tcon;
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mutex_unlock(&cifs_swnreg_idr_mutex);
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return reg;
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fail_net_name:
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kfree(reg->net_name);
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fail_idr:
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idr_remove(&cifs_swnreg_idr, reg->id);
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fail:
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kfree(reg);
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mutex_unlock(&cifs_swnreg_idr_mutex);
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return ERR_PTR(ret);
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}
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static void cifs_swn_reg_release(struct kref *ref)
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{
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struct cifs_swn_reg *swnreg = container_of(ref, struct cifs_swn_reg, ref_count);
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int ret;
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ret = cifs_swn_send_unregister_message(swnreg);
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if (ret < 0)
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cifs_dbg(VFS, "%s: Failed to send unregister message: %d\n", __func__, ret);
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idr_remove(&cifs_swnreg_idr, swnreg->id);
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kfree(swnreg->net_name);
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kfree(swnreg->share_name);
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kfree(swnreg);
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}
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static void cifs_put_swn_reg(struct cifs_swn_reg *swnreg)
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{
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mutex_lock(&cifs_swnreg_idr_mutex);
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kref_put(&swnreg->ref_count, cifs_swn_reg_release);
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mutex_unlock(&cifs_swnreg_idr_mutex);
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}
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static int cifs_swn_resource_state_changed(struct cifs_swn_reg *swnreg, const char *name, int state)
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{
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switch (state) {
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case CIFS_SWN_RESOURCE_STATE_UNAVAILABLE:
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cifs_dbg(FYI, "%s: resource name '%s' become unavailable\n", __func__, name);
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cifs_signal_cifsd_for_reconnect(swnreg->tcon->ses->server, true);
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break;
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case CIFS_SWN_RESOURCE_STATE_AVAILABLE:
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cifs_dbg(FYI, "%s: resource name '%s' become available\n", __func__, name);
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cifs_signal_cifsd_for_reconnect(swnreg->tcon->ses->server, true);
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break;
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case CIFS_SWN_RESOURCE_STATE_UNKNOWN:
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cifs_dbg(FYI, "%s: resource name '%s' changed to unknown state\n", __func__, name);
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break;
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}
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return 0;
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}
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static bool cifs_sockaddr_equal(struct sockaddr_storage *addr1, struct sockaddr_storage *addr2)
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{
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if (addr1->ss_family != addr2->ss_family)
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return false;
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if (addr1->ss_family == AF_INET) {
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return (memcmp(&((const struct sockaddr_in *)addr1)->sin_addr,
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&((const struct sockaddr_in *)addr2)->sin_addr,
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sizeof(struct in_addr)) == 0);
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}
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if (addr1->ss_family == AF_INET6) {
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return (memcmp(&((const struct sockaddr_in6 *)addr1)->sin6_addr,
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&((const struct sockaddr_in6 *)addr2)->sin6_addr,
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sizeof(struct in6_addr)) == 0);
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}
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return false;
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}
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static int cifs_swn_store_swn_addr(const struct sockaddr_storage *new,
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const struct sockaddr_storage *old,
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struct sockaddr_storage *dst)
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{
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__be16 port = cpu_to_be16(CIFS_PORT);
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if (old->ss_family == AF_INET) {
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struct sockaddr_in *ipv4 = (struct sockaddr_in *)old;
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port = ipv4->sin_port;
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} else if (old->ss_family == AF_INET6) {
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struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)old;
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port = ipv6->sin6_port;
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}
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if (new->ss_family == AF_INET) {
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struct sockaddr_in *ipv4 = (struct sockaddr_in *)new;
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ipv4->sin_port = port;
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} else if (new->ss_family == AF_INET6) {
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struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)new;
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ipv6->sin6_port = port;
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}
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*dst = *new;
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return 0;
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}
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static int cifs_swn_reconnect(struct cifs_tcon *tcon, struct sockaddr_storage *addr)
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{
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int ret = 0;
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/* Store the reconnect address */
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cifs_server_lock(tcon->ses->server);
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if (cifs_sockaddr_equal(&tcon->ses->server->dstaddr, addr))
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goto unlock;
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|
|
ret = cifs_swn_store_swn_addr(addr, &tcon->ses->server->dstaddr,
|
|
&tcon->ses->server->swn_dstaddr);
|
|
if (ret < 0) {
|
|
cifs_dbg(VFS, "%s: failed to store address: %d\n", __func__, ret);
|
|
goto unlock;
|
|
}
|
|
tcon->ses->server->use_swn_dstaddr = true;
|
|
|
|
/*
|
|
* Unregister to stop receiving notifications for the old IP address.
|
|
*/
|
|
ret = cifs_swn_unregister(tcon);
|
|
if (ret < 0) {
|
|
cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
|
|
__func__, ret);
|
|
goto unlock;
|
|
}
|
|
|
|
/*
|
|
* And register to receive notifications for the new IP address now that we have
|
|
* stored the new address.
|
|
*/
|
|
ret = cifs_swn_register(tcon);
|
|
if (ret < 0) {
|
|
cifs_dbg(VFS, "%s: Failed to register for witness notifications: %d\n",
|
|
__func__, ret);
|
|
goto unlock;
|
|
}
|
|
|
|
cifs_signal_cifsd_for_reconnect(tcon->ses->server, false);
|
|
|
|
unlock:
|
|
cifs_server_unlock(tcon->ses->server);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cifs_swn_client_move(struct cifs_swn_reg *swnreg, struct sockaddr_storage *addr)
|
|
{
|
|
struct sockaddr_in *ipv4 = (struct sockaddr_in *)addr;
|
|
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)addr;
|
|
|
|
if (addr->ss_family == AF_INET)
|
|
cifs_dbg(FYI, "%s: move to %pI4\n", __func__, &ipv4->sin_addr);
|
|
else if (addr->ss_family == AF_INET6)
|
|
cifs_dbg(FYI, "%s: move to %pI6\n", __func__, &ipv6->sin6_addr);
|
|
|
|
return cifs_swn_reconnect(swnreg->tcon, addr);
|
|
}
|
|
|
|
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_strscpy(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);
|
|
}
|
|
case CIFS_SWN_NOTIFICATION_CLIENT_MOVE: {
|
|
struct sockaddr_storage addr;
|
|
|
|
if (info->attrs[CIFS_GENL_ATTR_SWN_IP]) {
|
|
nla_memcpy(&addr, info->attrs[CIFS_GENL_ATTR_SWN_IP], sizeof(addr));
|
|
} else {
|
|
cifs_dbg(FYI, "%s: missing IP address attribute\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
return cifs_swn_client_move(swnreg, &addr);
|
|
}
|
|
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;
|
|
int ret;
|
|
|
|
swnreg = cifs_get_swn_reg(tcon);
|
|
if (IS_ERR(swnreg))
|
|
return PTR_ERR(swnreg);
|
|
|
|
ret = cifs_swn_send_register_message(swnreg);
|
|
if (ret < 0) {
|
|
cifs_dbg(VFS, "%s: Failed to send swn register message: %d\n", __func__, ret);
|
|
/* Do not put the swnreg or return error, the echo task will retry */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cifs_swn_unregister(struct cifs_tcon *tcon)
|
|
{
|
|
struct cifs_swn_reg *swnreg;
|
|
|
|
mutex_lock(&cifs_swnreg_idr_mutex);
|
|
|
|
swnreg = cifs_find_swn_reg(tcon);
|
|
if (IS_ERR(swnreg)) {
|
|
mutex_unlock(&cifs_swnreg_idr_mutex);
|
|
return PTR_ERR(swnreg);
|
|
}
|
|
|
|
mutex_unlock(&cifs_swnreg_idr_mutex);
|
|
|
|
cifs_put_swn_reg(swnreg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void cifs_swn_dump(struct seq_file *m)
|
|
{
|
|
struct cifs_swn_reg *swnreg;
|
|
struct sockaddr_in *sa;
|
|
struct sockaddr_in6 *sa6;
|
|
int id;
|
|
|
|
seq_puts(m, "Witness registrations:");
|
|
|
|
mutex_lock(&cifs_swnreg_idr_mutex);
|
|
idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
|
|
seq_printf(m, "\nId: %u Refs: %u Network name: '%s'%s Share name: '%s'%s Ip address: ",
|
|
id, kref_read(&swnreg->ref_count),
|
|
swnreg->net_name, swnreg->net_name_notify ? "(y)" : "(n)",
|
|
swnreg->share_name, swnreg->share_name_notify ? "(y)" : "(n)");
|
|
switch (swnreg->tcon->ses->server->dstaddr.ss_family) {
|
|
case AF_INET:
|
|
sa = (struct sockaddr_in *) &swnreg->tcon->ses->server->dstaddr;
|
|
seq_printf(m, "%pI4", &sa->sin_addr.s_addr);
|
|
break;
|
|
case AF_INET6:
|
|
sa6 = (struct sockaddr_in6 *) &swnreg->tcon->ses->server->dstaddr;
|
|
seq_printf(m, "%pI6", &sa6->sin6_addr.s6_addr);
|
|
if (sa6->sin6_scope_id)
|
|
seq_printf(m, "%%%u", sa6->sin6_scope_id);
|
|
break;
|
|
default:
|
|
seq_puts(m, "(unknown)");
|
|
}
|
|
seq_printf(m, "%s", swnreg->ip_notify ? "(y)" : "(n)");
|
|
}
|
|
mutex_unlock(&cifs_swnreg_idr_mutex);
|
|
seq_puts(m, "\n");
|
|
}
|
|
|
|
void cifs_swn_check(void)
|
|
{
|
|
struct cifs_swn_reg *swnreg;
|
|
int id;
|
|
int ret;
|
|
|
|
mutex_lock(&cifs_swnreg_idr_mutex);
|
|
idr_for_each_entry(&cifs_swnreg_idr, swnreg, id) {
|
|
ret = cifs_swn_send_register_message(swnreg);
|
|
if (ret < 0)
|
|
cifs_dbg(FYI, "%s: Failed to send register message: %d\n", __func__, ret);
|
|
}
|
|
mutex_unlock(&cifs_swnreg_idr_mutex);
|
|
}
|