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sunrpc: convert sp_task_pending flag to use atomic bitops 

In a later patch, we'll want to be able to handle this flag without
holding the sp_lock. Change this field to an unsigned long flags
field, and declare a new flag in it that can be managed with atomic
bitops.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2014-11-19 07:51:20 -05:00 committed by J. Bruce Fields
parent 62978b3c61
commit 4d5db3f536
2 changed files with 6 additions and 5 deletions
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4
include/linux/sunrpc/svc.h
View File

@ -50,7 +50,9 @@ struct svc_pool {
unsigned int sp_nrthreads; /* # of threads in pool */
struct list_head sp_all_threads; /* all server threads */
struct svc_pool_stats sp_stats; /* statistics on pool operation */
int sp_task_pending;/* has pending task */
#define SP_TASK_PENDING (0) /* still work to do even if no
* xprt is queued. */
unsigned long sp_flags;
} ____cacheline_aligned_in_smp;
/*

7
net/sunrpc/svc_xprt.c
View File

@ -509,7 +509,7 @@ void svc_wake_up(struct svc_serv *serv)
*/
wake_up_process(rqstp->rq_task);
} else
pool->sp_task_pending = 1;
set_bit(SP_TASK_PENDING, &pool->sp_flags);
spin_unlock_bh(&pool->sp_lock);
}
}
@ -644,10 +644,9 @@ static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
* long for cache updates.
*/
rqstp->rq_chandle.thread_wait = 1*HZ;
pool->sp_task_pending = 0;
clear_bit(SP_TASK_PENDING, &pool->sp_flags);
} else {
if (pool->sp_task_pending) {
pool->sp_task_pending = 0;
if (test_and_clear_bit(SP_TASK_PENDING, &pool->sp_flags)) {
xprt = ERR_PTR(-EAGAIN);
goto out;
}