Commit fed979a7 authored by Samuel Cabrero's avatar Samuel Cabrero Committed by Steve French
Browse files

cifs: Set witness notification handler for messages from userspace daemon 



+ 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: default avatarSamuel Cabrero <scabrero@suse.de>
Reviewed-by: default avatarAurelien Aptel <aaptel@suse.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent bf80e5d4

fs/cifs/cifs_swn.c

+86 −0
Original line number Diff line number Diff line
@@ -383,6 +383,92 @@ 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;

fs/cifs/cifs_swn.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */

fs/cifs/netlink.c

+9 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include "netlink.h"

#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 },
@@ -24,9 +25,17 @@ 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[] = {

include/uapi/linux/cifs/cifs_netlink.h

+17 −0
Original line number Diff line number Diff line
@@ -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 */

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