Commit 52f98f1a authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS/pnfs: Separate NFSv3 DS and MDS traffic 



If a NFSv3 server is being used as both a DS and as a regular NFSv3 server,
we may want to keep the IO traffic on a separate TCP connection, since
it will typically have very different timeout characteristics.

This patch therefore sets up a flag to separate the two modes of operation
for the nfs_client.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent c6eb5843

fs/nfs/client.c

+6 −0
Original line number Diff line number Diff line
@@ -312,6 +312,12 @@ again: 
		/* Match nfsv4 minorversion */

		if (clp->cl_minorversion != data->minorversion)

			continue;



		/* Match request for a dedicated DS */

		if (test_bit(NFS_CS_DS, &data->init_flags) !=

		    test_bit(NFS_CS_DS, &clp->cl_flags))

			continue;



		/* Match the full socket address */

		if (!rpc_cmp_addr_port(sap, clap))

			/* Match all xprt_switch full socket addresses */

fs/nfs/nfs3client.c

+1 −0
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 
		__set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);



	__set_bit(NFS_CS_NOPING, &cl_init.init_flags);

	__set_bit(NFS_CS_DS, &cl_init.init_flags);



	/* Use the MDS nfs_client cl_ipaddr. */

	nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);

include/linux/nfs_fs_sb.h

+1 −0
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ struct nfs_client { 
#define NFS_CS_NO_RETRANS_TIMEOUT	4	/* - Disable retransmit timeouts */

#define NFS_CS_TSM_POSSIBLE	5		/* - Maybe state migration */

#define NFS_CS_NOPING		6		/* - don't ping on connect */

#define NFS_CS_DS		7		/* - Server is a DS */

	struct sockaddr_storage	cl_addr;	/* server identifier */

	size_t			cl_addrlen;

	char *			cl_hostname;	/* hostname of server */

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