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bcache: kill closure locking code

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Also flesh out the documentation a bit

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-12-20 15:55:23 -08:00
parent cb7a583e6a
commit 1dd13c8d3c
2 changed files with 128 additions and 318 deletions
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90
drivers/md/bcache/closure.c
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@@ -11,19 +11,6 @@
#include "closure.h"
#define CL_FIELD(type, field) \
case TYPE_ ## type: \
return &container_of(cl, struct type, cl)->field
static struct closure_waitlist *closure_waitlist(struct closure *cl)
{
switch (cl->type) {
CL_FIELD(closure_with_waitlist, wait);
default:
return NULL;
}
}
static inline void closure_put_after_sub(struct closure *cl, int flags)
{
int r = flags & CLOSURE_REMAINING_MASK;
@@ -42,17 +29,10 @@ static inline void closure_put_after_sub(struct closure *cl, int flags)
closure_queue(cl);
} else {
struct closure *parent = cl->parent;
struct closure_waitlist *wait = closure_waitlist(cl);
closure_fn *destructor = cl->fn;
closure_debug_destroy(cl);
smp_mb();
atomic_set(&cl->remaining, -1);
if (wait)
closure_wake_up(wait);
if (destructor)
destructor(cl);
@@ -69,19 +49,18 @@ void closure_sub(struct closure *cl, int v)
}
EXPORT_SYMBOL(closure_sub);
/**
* closure_put - decrement a closure's refcount
*/
void closure_put(struct closure *cl)
{
closure_put_after_sub(cl, atomic_dec_return(&cl->remaining));
}
EXPORT_SYMBOL(closure_put);
static void set_waiting(struct closure *cl, unsigned long f)
{
#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
cl->waiting_on = f;
#endif
}
/**
* closure_wake_up - wake up all closures on a wait list, without memory barrier
*/
void __closure_wake_up(struct closure_waitlist *wait_list)
{
struct llist_node *list;
@@ -106,27 +85,34 @@ void __closure_wake_up(struct closure_waitlist *wait_list)
cl = container_of(reverse, struct closure, list);
reverse = llist_next(reverse);
set_waiting(cl, 0);
closure_set_waiting(cl, 0);
closure_sub(cl, CLOSURE_WAITING + 1);
}
}
EXPORT_SYMBOL(__closure_wake_up);
bool closure_wait(struct closure_waitlist *list, struct closure *cl)
/**
* closure_wait - add a closure to a waitlist
*
* @waitlist will own a ref on @cl, which will be released when
* closure_wake_up() is called on @waitlist.
*
*/
bool closure_wait(struct closure_waitlist *waitlist, struct closure *cl)
{
if (atomic_read(&cl->remaining) & CLOSURE_WAITING)
return false;
set_waiting(cl, _RET_IP_);
closure_set_waiting(cl, _RET_IP_);
atomic_add(CLOSURE_WAITING + 1, &cl->remaining);
llist_add(&cl->list, &list->list);
llist_add(&cl->list, &waitlist->list);
return true;
}
EXPORT_SYMBOL(closure_wait);
/**
* closure_sync() - sleep until a closure a closure has nothing left to wait on
* closure_sync - sleep until a closure a closure has nothing left to wait on
*
* Sleeps until the refcount hits 1 - the thread that's running the closure owns
* the last refcount.
@@ -148,46 +134,6 @@ void closure_sync(struct closure *cl)
}
EXPORT_SYMBOL(closure_sync);
/**
* closure_trylock() - try to acquire the closure, without waiting
* @cl: closure to lock
*
* Returns true if the closure was succesfully locked.
*/
bool closure_trylock(struct closure *cl, struct closure *parent)
{
if (atomic_cmpxchg(&cl->remaining, -1,
CLOSURE_REMAINING_INITIALIZER) != -1)
return false;
smp_mb();
cl->parent = parent;
if (parent)
closure_get(parent);
closure_set_ret_ip(cl);
closure_debug_create(cl);
return true;
}
EXPORT_SYMBOL(closure_trylock);
void __closure_lock(struct closure *cl, struct closure *parent,
struct closure_waitlist *wait_list)
{
struct closure wait;
closure_init_stack(&wait);
while (1) {
if (closure_trylock(cl, parent))
return;
closure_wait_event(wait_list, &wait,
atomic_read(&cl->remaining) == -1);
}
}
EXPORT_SYMBOL(__closure_lock);
#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
static LIST_HEAD(closure_list);