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sunrpc: make xprt->swapper an atomic_t

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Split xs_swapper into enable/disable functions and eliminate the
"enable" flag.

Currently, it's racy if you have multiple swapon/swapoff operations
running in parallel over the same xprt. Also fix it so that we only
set it to a memalloc socket on a 0->1 transition and only clear it
on a 1->0 transition.

Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Jeff Layton 2015-06-03 16:14:26 -04:00 • committed by Trond Myklebust
parent 3c87ef6efb
commit 8e2281330f
3 changed files with 30 additions and 17 deletions
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5
include/linux/sunrpc/xprt.h
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@ -180,7 +180,7 @@ struct rpc_xprt {
atomic_t num_reqs; /* total slots */
unsigned long state; /* transport state */
unsigned char resvport : 1; /* use a reserved port */
unsigned int swapper; /* we're swapping over this
atomic_t swapper; /* we're swapping over this
transport */
unsigned int bind_index; /* bind function index */
@ -346,7 +346,8 @@ void xprt_release_rqst_cong(struct rpc_task *task);
void xprt_disconnect_done(struct rpc_xprt *xprt);
void xprt_force_disconnect(struct rpc_xprt *xprt);
void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
int xs_swapper(struct rpc_xprt *xprt, int enable);
int xs_swapper_enable(struct rpc_xprt *xprt);
void xs_swapper_disable(struct rpc_xprt *xprt);
bool xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
void xprt_unlock_connect(struct rpc_xprt *, void *);