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orangefs: get rid of loop in wait_for_matching_downcall() 

turn op->waitq into struct completion...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Al Viro 2016-02-13 10:15:22 -05:00 committed by Mike Marshall
parent cf22644a0e
commit d2d87a3b6d
3 changed files with 50 additions and 89 deletions
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2
fs/orangefs/orangefs-cache.c
View File

@ -118,7 +118,7 @@ struct orangefs_kernel_op_s *op_alloc(__s32 type)
if (new_op) {
INIT_LIST_HEAD(&new_op->list);
spin_lock_init(&new_op->lock);
init_waitqueue_head(&new_op->waitq);
init_completion(&new_op->waitq);
atomic_set(&new_op->ref_count, 1);

6
fs/orangefs/orangefs-kernel.h
View File

@ -202,7 +202,7 @@ struct orangefs_kernel_op_s {
struct orangefs_upcall_s upcall;
struct orangefs_downcall_s downcall;
wait_queue_head_t waitq;
struct completion waitq;
spinlock_t lock;
struct completion done;
@ -222,7 +222,7 @@ struct orangefs_kernel_op_s {
static inline void set_op_state_serviced(struct orangefs_kernel_op_s *op)
{
op->op_state = OP_VFS_STATE_SERVICED;
wake_up_interruptible(&op->waitq);
complete(&op->waitq);
}
#define op_state_waiting(op) ((op)->op_state & OP_VFS_STATE_WAITING)
@ -266,7 +266,7 @@ static inline void set_op_state_purged(struct orangefs_kernel_op_s *op)
put_cancel(op);
} else {
op->op_state |= OP_VFS_STATE_PURGED;
wake_up_interruptible(&op->waitq);
complete(&op->waitq);
spin_unlock(&op->lock);
}
}

131
fs/orangefs/waitqueue.c
View File

@ -17,6 +17,7 @@
#include "orangefs-bufmap.h"
static int wait_for_matching_downcall(struct orangefs_kernel_op_s *);
static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *);
/*
* What we do in this function is to walk the list of operations that are
@ -170,8 +171,10 @@ retry_servicing:
gossip_err("orangefs: %s -- wait timed out; aborting attempt.\n",
op_name);
}
orangefs_clean_up_interrupted_operation(op);
op->downcall.status = ret;
} else {
spin_unlock(&op->lock);
/* got matching downcall; make sure status is in errno format */
op->downcall.status =
orangefs_normalize_to_errno(op->downcall.status);
@ -343,6 +346,7 @@ static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s
gossip_err("%s: can't get here.\n", __func__);
spin_unlock(&op->lock);
}
reinit_completion(&op->waitq);
}
/*
@ -359,95 +363,52 @@ static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s
* EINTR/EIO/ETIMEDOUT indicating we are done trying to service this
* operation since client-core seems to be exiting too often
* or if we were interrupted.
*
* Returns with op->lock taken.
*/
static int wait_for_matching_downcall(struct orangefs_kernel_op_s *op)
{
int ret = -EINVAL;
DEFINE_WAIT(wait_entry);
while (1) {
spin_lock(&op->lock);
prepare_to_wait(&op->waitq, &wait_entry, TASK_INTERRUPTIBLE);
if (op_state_serviced(op)) {
spin_unlock(&op->lock);
ret = 0;
break;
}
if (unlikely(signal_pending(current))) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation interrupted by a signal (tag "
"%llu, op %p)\n",
__func__,
llu(op->tag),
op);
orangefs_clean_up_interrupted_operation(op);
ret = -EINTR;
break;
}
/*
* if this was our first attempt and client-core
* has not purged our operation, we are happy to
* simply wait
*/
if (op->attempts == 0 && !op_state_purged(op)) {
spin_unlock(&op->lock);
schedule();
} else {
spin_unlock(&op->lock);
/*
* subsequent attempts, we retry exactly once
* with timeouts
*/
if (!schedule_timeout(op_timeout_secs * HZ)) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation timed out (tag"
" %llu, %p, att %d)\n",
__func__,
llu(op->tag),
op,
op->attempts);
ret = -ETIMEDOUT;
spin_lock(&op->lock);
orangefs_clean_up_interrupted_operation(op);
break;
}
}
spin_lock(&op->lock);
op->attempts++;
/*
* if the operation was purged in the meantime, it
* is better to requeue it afresh but ensure that
* we have not been purged repeatedly. This could
* happen if client-core crashes when an op
* is being serviced, so we requeue the op, client
* core crashes again so we requeue the op, client
* core starts, and so on...
*/
if (op_state_purged(op)) {
ret = (op->attempts < ORANGEFS_PURGE_RETRY_COUNT) ?
-EAGAIN :
-EIO;
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation purged (tag "
"%llu, %p, att %d)\n",
__func__,
llu(op->tag),
op,
op->attempts);
orangefs_clean_up_interrupted_operation(op);
break;
}
spin_unlock(&op->lock);
}
long timeout, n;
timeout = op->attempts ? op_timeout_secs * HZ : MAX_SCHEDULE_TIMEOUT;
n = wait_for_completion_interruptible_timeout(&op->waitq, timeout);
spin_lock(&op->lock);
finish_wait(&op->waitq, &wait_entry);
spin_unlock(&op->lock);
return ret;
if (op_state_serviced(op))
return 0;
if (unlikely(n < 0)) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation interrupted by a signal (tag "
"%llu, op %p)\n",
__func__,
llu(op->tag),
op);
return -EINTR;
}
op->attempts++;
if (op_state_purged(op)) {
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation purged (tag "
"%llu, %p, att %d)\n",
__func__,
llu(op->tag),
op,
op->attempts);
return (op->attempts < ORANGEFS_PURGE_RETRY_COUNT) ?
-EAGAIN :
-EIO;
}
/* must have timed out, then... */
gossip_debug(GOSSIP_WAIT_DEBUG,
"*** %s:"
" operation timed out (tag"
" %llu, %p, att %d)\n",
__func__,
llu(op->tag),
op,
op->attempts);
return -ETIMEDOUT;
}