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NFSv4.x: Add kernel parameter to control the callback server 

Add support for the kernel parameter nfs.callback_nr_threads to set
the number of threads that will be assigned to the callback channel.

Add support for the kernel parameter nfs.nfs.max_session_cb_slots
to set the maximum size of the callback channel slot table.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2016-08-29 20:03:52 -04:00 committed by Anna Schumaker
parent bb6aeba736
commit 5405fc44c3
7 changed files with 33 additions and 6 deletions
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12
Documentation/kernel-parameters.txt
View File

@ -2420,6 +2420,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nfsrootdebug [NFS] enable nfsroot debugging messages.
See Documentation/filesystems/nfs/nfsroot.txt.
nfs.callback_nr_threads=
[NFSv4] set the total number of threads that the
NFS client will assign to service NFSv4 callback
requests.
nfs.callback_tcpport=
[NFS] set the TCP port on which the NFSv4 callback
channel should listen.
@ -2443,6 +2448,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
of returning the full 64-bit number.
The default is to return 64-bit inode numbers.
nfs.max_session_cb_slots=
[NFSv4.1] Sets the maximum number of session
slots the client will assign to the callback
channel. This determines the maximum number of
callbacks the client will process in parallel for
a particular server.
nfs.max_session_slots=
[NFSv4.1] Sets the maximum number of session slots
the client will attempt to negotiate with the server.

5
fs/nfs/callback.c
View File

@ -148,11 +148,14 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
struct svc_serv *serv)
{
const int nrservs = NFS4_NR_CALLBACK_THREADS;
int nrservs = nfs_callback_nr_threads;
int ret;
nfs_callback_bc_serv(minorversion, xprt, serv);
if (nrservs < NFS4_MIN_NR_CALLBACK_THREADS)
nrservs = NFS4_MIN_NR_CALLBACK_THREADS;
if (serv->sv_nrthreads-1 == nrservs)
return 0;

3
fs/nfs/callback.h
View File

@ -198,8 +198,9 @@ extern void nfs_callback_down(int minorversion, struct net *net);
#define NFS41_BC_MIN_CALLBACKS 1
#define NFS41_BC_MAX_CALLBACKS 1
#define NFS4_NR_CALLBACK_THREADS 1
#define NFS4_MIN_NR_CALLBACK_THREADS 1
extern unsigned int nfs_callback_set_tcpport;
extern unsigned short nfs_callback_nr_threads;
#endif /* __LINUX_FS_NFS_CALLBACK_H */

1
fs/nfs/nfs4_fs.h
View File

@ -471,6 +471,7 @@ extern struct nfs_subversion nfs_v4;
struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
extern bool nfs4_disable_idmapping;
extern unsigned short max_session_slots;
extern unsigned short max_session_cb_slots;
extern unsigned short send_implementation_id;
extern bool recover_lost_locks;

7
fs/nfs/nfs4proc.c
View File

@ -7463,7 +7463,7 @@ static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
args->bc_attrs.max_resp_sz = max_bc_payload;
args->bc_attrs.max_resp_sz_cached = 0;
args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
args->bc_attrs.max_reqs = NFS41_BC_MAX_CALLBACKS;
args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1);
dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
@ -7510,10 +7510,9 @@ static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args
return -EINVAL;
if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
return -EINVAL;
/* These would render the backchannel useless: */
if (rcvd->max_ops != sent->max_ops)
if (rcvd->max_ops > sent->max_ops)
return -EINVAL;
if (rcvd->max_reqs != sent->max_reqs)
if (rcvd->max_reqs > sent->max_reqs)
return -EINVAL;
out:
return 0;

1
fs/nfs/nfs4session.h
View File

@ -9,6 +9,7 @@
/* maximum number of slots to use */
#define NFS4_DEF_SLOT_TABLE_SIZE (64U)
#define NFS4_DEF_CB_SLOT_TABLE_SIZE (1U)
#define NFS4_MAX_SLOT_TABLE (1024U)
#define NFS4_NO_SLOT ((u32)-1)

10
fs/nfs/super.c
View File

@ -2848,19 +2848,23 @@ out_invalid_transport_udp:
* NFS client for backwards compatibility
*/
unsigned int nfs_callback_set_tcpport;
unsigned short nfs_callback_nr_threads;
/* Default cache timeout is 10 minutes */
unsigned int nfs_idmap_cache_timeout = 600;
/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
bool nfs4_disable_idmapping = true;
unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
unsigned short send_implementation_id = 1;
char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
bool recover_lost_locks = false;
EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
EXPORT_SYMBOL_GPL(max_session_slots);
EXPORT_SYMBOL_GPL(max_session_cb_slots);
EXPORT_SYMBOL_GPL(send_implementation_id);
EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
EXPORT_SYMBOL_GPL(recover_lost_locks);
@ -2887,6 +2891,9 @@ static const struct kernel_param_ops param_ops_portnr = {
#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
"assigned to the NFSv4 callback channels.");
module_param(nfs_idmap_cache_timeout, int, 0644);
module_param(nfs4_disable_idmapping, bool, 0644);
module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
@ -2896,6 +2903,9 @@ MODULE_PARM_DESC(nfs4_disable_idmapping,
module_param(max_session_slots, ushort, 0644);
MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
"requests the client will negotiate");
module_param(max_session_cb_slots, ushort, 0644);
MODULE_PARM_DESC(max_session_slots, "Maximum number of parallel NFSv4.1 "
"callbacks the client will process for a given server");
module_param(send_implementation_id, ushort, 0644);
MODULE_PARM_DESC(send_implementation_id,
"Send implementation ID with NFSv4.1 exchange_id");