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SUNRPC: Fix up task signalling

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The RPC_TASK_KILLED flag should really not be set from another context
because it can clobber data in the struct task when task->tk_flags is
changed non-atomically.
Let's therefore swap out RPC_TASK_KILLED with an atomic flag, and add
a function to set that flag and safely wake up the task.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust
2019-04-07 13:58:44 -04:00
committed by Anna Schumaker
parent 085b775580
commit ae67bd3821
7 changed files with 40 additions and 26 deletions
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6
include/trace/events/sunrpc.h
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@@ -82,7 +82,6 @@ TRACE_DEFINE_ENUM(RPC_TASK_SWAPPER);
TRACE_DEFINE_ENUM(RPC_CALL_MAJORSEEN);
TRACE_DEFINE_ENUM(RPC_TASK_ROOTCREDS);
TRACE_DEFINE_ENUM(RPC_TASK_DYNAMIC);
TRACE_DEFINE_ENUM(RPC_TASK_KILLED);
TRACE_DEFINE_ENUM(RPC_TASK_SOFT);
TRACE_DEFINE_ENUM(RPC_TASK_SOFTCONN);
TRACE_DEFINE_ENUM(RPC_TASK_SENT);
@@ -97,7 +96,6 @@ TRACE_DEFINE_ENUM(RPC_TASK_NO_RETRANS_TIMEOUT);
{ RPC_CALL_MAJORSEEN, "MAJORSEEN" }, \
{ RPC_TASK_ROOTCREDS, "ROOTCREDS" }, \
{ RPC_TASK_DYNAMIC, "DYNAMIC" }, \
{ RPC_TASK_KILLED, "KILLED" }, \
{ RPC_TASK_SOFT, "SOFT" }, \
{ RPC_TASK_SOFTCONN, "SOFTCONN" }, \
{ RPC_TASK_SENT, "SENT" }, \
@@ -111,6 +109,7 @@ TRACE_DEFINE_ENUM(RPC_TASK_ACTIVE);
TRACE_DEFINE_ENUM(RPC_TASK_NEED_XMIT);
TRACE_DEFINE_ENUM(RPC_TASK_NEED_RECV);
TRACE_DEFINE_ENUM(RPC_TASK_MSG_PIN_WAIT);
TRACE_DEFINE_ENUM(RPC_TASK_SIGNALLED);
#define rpc_show_runstate(flags) \
__print_flags(flags, "|", \
@@ -119,7 +118,8 @@ TRACE_DEFINE_ENUM(RPC_TASK_MSG_PIN_WAIT);
{ (1UL << RPC_TASK_ACTIVE), "ACTIVE" }, \
{ (1UL << RPC_TASK_NEED_XMIT), "NEED_XMIT" }, \
{ (1UL << RPC_TASK_NEED_RECV), "NEED_RECV" }, \
{ (1UL << RPC_TASK_MSG_PIN_WAIT), "MSG_PIN_WAIT" })
{ (1UL << RPC_TASK_MSG_PIN_WAIT), "MSG_PIN_WAIT" }, \
{ (1UL << RPC_TASK_SIGNALLED), "SIGNALLED" })
DECLARE_EVENT_CLASS(rpc_task_running,