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| author | Chuck Lever <chuck.lever@oracle.com> | 2016-09-15 14:55:20 (GMT) |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-09-19 17:08:37 (GMT) |
| commit | 5fe6eaa1f9a00b9a5927e3b791ecad2f3eaab130 (patch) | |
| tree | 3b5b516ef941eb91452458260d08b3473491913c /include | |
| parent | b9c5bc03be6aae41990efd09f83cf70a89ac9f4b (diff) | |
| download | linux-5fe6eaa1f9a00b9a5927e3b791ecad2f3eaab130.tar.xz | |
SUNRPC: Generalize the RPC buffer allocation API
xprtrdma needs to allocate the Call and Reply buffers separately.
TBH, the reliance on using a single buffer for the pair of XDR
buffers is transport implementation-specific.
Transports that want to allocate separate Call and Reply buffers
will ignore the "size" argument anyway. Don't bother passing it.
The buf_alloc method can't return two pointers. Instead, make the
method's return value an error code, and set the rq_buffer pointer
in the method itself.
This gives call_allocate an opportunity to terminate an RPC instead
of looping forever when a permanent problem occurs. If a request is
just bogus, or the transport is in a state where it can't allocate
resources for any request, there needs to be a way to kill the RPC
right there and not loop.
This immediately fixes a rare problem in the backchannel send path,
which loops if the server happens to send a CB request whose
call+reply size is larger than a page (which it shouldn't do yet).
One more issue: looks like xprt_inject_disconnect was incorrectly
placed in the failure path in call_allocate. It needs to be in the
success path, as it is for other call-sites.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sunrpc/sched.h | 2 | ||||
| -rw-r--r-- | include/linux/sunrpc/xprt.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h index 817af0b..38d4c1b 100644 --- a/include/linux/sunrpc/sched.h +++ b/include/linux/sunrpc/sched.h @@ -239,7 +239,7 @@ struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *, void *); void rpc_wake_up_status(struct rpc_wait_queue *, int); void rpc_delay(struct rpc_task *, unsigned long); -void * rpc_malloc(struct rpc_task *, size_t); +int rpc_malloc(struct rpc_task *); void rpc_free(void *); int rpciod_up(void); void rpciod_down(void); diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h index 6f1d41b..c01f468 100644 --- a/include/linux/sunrpc/xprt.h +++ b/include/linux/sunrpc/xprt.h @@ -127,7 +127,7 @@ struct rpc_xprt_ops { void (*rpcbind)(struct rpc_task *task); void (*set_port)(struct rpc_xprt *xprt, unsigned short port); void (*connect)(struct rpc_xprt *xprt, struct rpc_task *task); - void * (*buf_alloc)(struct rpc_task *task, size_t size); + int (*buf_alloc)(struct rpc_task *task); void (*buf_free)(void *buffer); int (*send_request)(struct rpc_task *task); void (*set_retrans_timeout)(struct rpc_task *task); |