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NFS/pnfs: Separate NFSv3 DS and MDS traffic

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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: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-10-17 09:49:45 -04:00
parent c6eb58435b
commit 52f98f1a2d
3 changed files with 8 additions and 0 deletions
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6
fs/nfs/client.c
View File

@ -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 */

1
fs/nfs/nfs3client.c
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@ -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);

1
include/linux/nfs_fs_sb.h
View File

@ -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 */