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authorChuck Lever <chuck.lever@oracle.com>2016-09-15 17:55:20 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2016-09-19 20:08:37 +0300
commit5fe6eaa1f9a00b9a5927e3b791ecad2f3eaab130 (patch)
tree3b5b516ef941eb91452458260d08b3473491913c /include/linux/sunrpc
parentb9c5bc03be6aae41990efd09f83cf70a89ac9f4b (diff)
downloadlinux-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/linux/sunrpc')
-rw-r--r--include/linux/sunrpc/sched.h2
-rw-r--r--include/linux/sunrpc/xprt.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 817af0b4385e..38d4c1b378f2 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 6f1d41b559a3..c01f468fb374 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);