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NFS: allow deprecation of NFS UDP protocol

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Add a kernel config CONFIG_NFS_DISABLE_UDP_SUPPORT to disallow NFS
UDP mounts and enable it by default.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Olga Kornievskaia 2019-12-16 16:34:02 -05:00 committed by Anna Schumaker
parent f7b37b8b13
commit b24ee6c64c
3 changed files with 17 additions and 0 deletions
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9
fs/nfs/Kconfig
View File

@ -196,3 +196,12 @@ config NFS_DEBUG
depends on NFS_FS && SUNRPC_DEBUG
select CRC32
default y
config NFS_DISABLE_UDP_SUPPORT
bool "NFS: Disable NFS UDP protocol support"
depends on NFS_FS
default y
help
Choose Y here to disable the use of NFS over UDP. NFS over UDP
on modern networks (1Gb+) can lead to data corruption caused by
fragmentation during high loads.

4
fs/nfs/client.c
View File

@ -474,6 +474,7 @@ void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
to->to_maxval = to->to_initval;
to->to_exponential = 0;
break;
#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
case XPRT_TRANSPORT_UDP:
if (retrans == NFS_UNSPEC_RETRANS)
to->to_retries = NFS_DEF_UDP_RETRANS;
@ -484,6 +485,7 @@ void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
to->to_maxval = NFS_MAX_UDP_TIMEOUT;
to->to_exponential = 1;
break;
#endif
default:
BUG();
}
@ -580,8 +582,10 @@ static int nfs_start_lockd(struct nfs_server *server)
default:
nlm_init.protocol = IPPROTO_TCP;
break;
#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT
case XPRT_TRANSPORT_UDP:
nlm_init.protocol = IPPROTO_UDP;
#endif
}
host = nlmclnt_init(&nlm_init);

4
fs/nfs/fs_context.c
View File

@ -1215,6 +1215,10 @@ static int nfs_fs_context_validate(struct fs_context *fc)
}
} else {
nfs_set_mount_transport_protocol(ctx);
#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
goto out_invalid_transport_udp;
#endif
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
port = NFS_RDMA_PORT;
}