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SUNRPC: Fix up backchannel slot table accounting

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Add a per-transport maximum limit in the socket case, and add
helpers to allow the NFSv4 code to discover that limit.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust
2019-07-16 13:51:29 -04:00
parent 9f98effc19
commit 7402a4fedc
11 changed files with 55 additions and 21 deletions
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1
include/linux/sunrpc/bc_xprt.h
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@@ -43,6 +43,7 @@ void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs);
void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs);
void xprt_free_bc_rqst(struct rpc_rqst *req);
unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt);
/*
* Determine if a shared backchannel is in use

1
include/linux/sunrpc/clnt.h
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@@ -194,6 +194,7 @@ void rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
struct net * rpc_net_ns(struct rpc_clnt *);
size_t rpc_max_payload(struct rpc_clnt *);
size_t rpc_max_bc_payload(struct rpc_clnt *);
unsigned int rpc_num_bc_slots(struct rpc_clnt *);
void rpc_force_rebind(struct rpc_clnt *);
size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
const char *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);

6
include/linux/sunrpc/xprt.h
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@@ -158,6 +158,7 @@ struct rpc_xprt_ops {
int (*bc_setup)(struct rpc_xprt *xprt,
unsigned int min_reqs);
size_t (*bc_maxpayload)(struct rpc_xprt *xprt);
unsigned int (*bc_num_slots)(struct rpc_xprt *xprt);
void (*bc_free_rqst)(struct rpc_rqst *rqst);
void (*bc_destroy)(struct rpc_xprt *xprt,
unsigned int max_reqs);
@@ -251,8 +252,9 @@ struct rpc_xprt {
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
struct svc_serv *bc_serv; /* The RPC service which will */
/* process the callback */
int bc_alloc_count; /* Total number of preallocs */
atomic_t bc_free_slots;
unsigned int bc_alloc_max;
unsigned int bc_alloc_count; /* Total number of preallocs */
atomic_t bc_slot_count; /* Number of allocated slots */
spinlock_t bc_pa_lock; /* Protects the preallocated
* items */
struct list_head bc_pa_list; /* List of preallocated