[PATCH 15/32] bcache: move closures to lib/

Kent Overstreet
2023-05-09T16:58:53Z

From: Kent Overstreet <kent.overstreet@gmail.com>

Prep work for bcachefs - being a fork of bcache it also uses closures

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Acked-by: Coly Li <colyli@suse.de>
---
drivers/md/bcache/Kconfig | 10 +-----
drivers/md/bcache/Makefile | 4 +--
drivers/md/bcache/bcache.h | 2 +-
drivers/md/bcache/super.c | 1 -
drivers/md/bcache/util.h | 3 +-
.../md/bcache => include/linux}/closure.h | 17 +++++----
lib/Kconfig | 3 ++
lib/Kconfig.debug | 9 +++++
lib/Makefile | 2 ++
{drivers/md/bcache => lib}/closure.c | 35 +++++++++----------
10 files changed, 43 insertions(+), 43 deletions(-)
rename {drivers/md/bcache => include/linux}/closure.h (97%)
rename {drivers/md/bcache => lib}/closure.c (88%)

diff --git a/drivers/md/bcache/Kconfig b/drivers/md/bcache/Kconfig
index 529c9d04e9..b2d10063d3 100644
--- a/drivers/md/bcache/Kconfig
+++ b/drivers/md/bcache/Kconfig
@@ -4,6 +4,7 @@ config BCACHE
tristate "Block device as cache"
select BLOCK_HOLDER_DEPRECATED if SYSFS
select CRC64
+ select CLOSURES
help
Allows a block device to be used as cache for other devices; uses
a btree for indexing and the layout is optimized for SSDs.
@@ -19,15 +20,6 @@ config BCACHE_DEBUG
Enables extra debugging tools, allows expensive runtime checks to be
turned on.

-config BCACHE_CLOSURES_DEBUG
- bool "Debug closures"
- depends on BCACHE
- select DEBUG_FS
- help
- Keeps all active closures in a linked list and provides a debugfs
- interface to list them, which makes it possible to see asynchronous
- operations that get stuck.
-
config BCACHE_ASYNC_REGISTRATION
bool "Asynchronous device registration"
depends on BCACHE
diff --git a/drivers/md/bcache/Makefile b/drivers/md/bcache/Makefile
index 5b87e59676..054e8a33a7 100644
--- a/drivers/md/bcache/Makefile
+++ b/drivers/md/bcache/Makefile
@@ -2,6 +2,6 @@

obj-$(CONFIG_BCACHE) += bcache.o

-bcache-y := alloc.o bset.o btree.o closure.o debug.o extents.o\
- io.o journal.o movinggc.o request.o stats.o super.o sysfs.o trace.o\
+bcache-y := alloc.o bset.o btree.o debug.o extents.o io.o\
+ journal.o movinggc.o request.o stats.o super.o sysfs.o trace.o\
util.o writeback.o features.o
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index aebb7ef10e..c8b4914ad8 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -179,6 +179,7 @@
#define pr_fmt(fmt) "bcache: %s() " fmt, __func__

#include <linux/bio.h>
+#include <linux/closure.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/mutex.h>
@@ -192,7 +193,6 @@
#include "bcache_ondisk.h"
#include "bset.h"
#include "util.h"
-#include "closure.h"

struct bucket {
atomic_t pin;
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index ba3909bb6b..31b68a1b87 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2912,7 +2912,6 @@ static int __init bcache_init(void)
goto err;

bch_debug_init();
- closure_debug_init();

bcache_is_reboot = false;

diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index 6f3cb7c921..f61ab1bada 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -4,6 +4,7 @@
#define _BCACHE_UTIL_H

#include <linux/blkdev.h>
+#include <linux/closure.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched/clock.h>
@@ -13,8 +14,6 @@
#include <linux/workqueue.h>
#include <linux/crc64.h>

-#include "closure.h"
-
struct closure;

#ifdef CONFIG_BCACHE_DEBUG
diff --git a/drivers/md/bcache/closure.h b/include/linux/closure.h
similarity index 97%
rename from drivers/md/bcache/closure.h
rename to include/linux/closure.h
index c88cdc4ae4..0ec9e7bc8d 100644
--- a/drivers/md/bcache/closure.h
+++ b/include/linux/closure.h
@@ -155,7 +155,7 @@ struct closure {

atomic_t remaining;

-#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
+#ifdef CONFIG_DEBUG_CLOSURES
#define CLOSURE_MAGIC_DEAD 0xc054dead
#define CLOSURE_MAGIC_ALIVE 0xc054a11e

@@ -184,15 +184,13 @@ static inline void closure_sync(struct closure *cl)
__closure_sync(cl);
}

-#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
+#ifdef CONFIG_DEBUG_CLOSURES

-void closure_debug_init(void);
void closure_debug_create(struct closure *cl);
void closure_debug_destroy(struct closure *cl);

#else

-static inline void closure_debug_init(void) {}
static inline void closure_debug_create(struct closure *cl) {}
static inline void closure_debug_destroy(struct closure *cl) {}

@@ -200,21 +198,21 @@ static inline void closure_debug_destroy(struct closure *cl) {}

static inline void closure_set_ip(struct closure *cl)
{
-#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
+#ifdef CONFIG_DEBUG_CLOSURES
cl->ip = _THIS_IP_;
#endif
}

static inline void closure_set_ret_ip(struct closure *cl)
{
-#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
+#ifdef CONFIG_DEBUG_CLOSURES
cl->ip = _RET_IP_;
#endif
}

static inline void closure_set_waiting(struct closure *cl, unsigned long f)
{
-#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
+#ifdef CONFIG_DEBUG_CLOSURES
cl->waiting_on = f;
#endif
}
@@ -243,6 +241,7 @@ static inline void closure_queue(struct closure *cl)
*/
BUILD_BUG_ON(offsetof(struct closure, fn)
!= offsetof(struct work_struct, func));
+
if (wq) {
INIT_WORK(&cl->work, cl->work.func);
BUG_ON(!queue_work(wq, &cl->work));
@@ -255,7 +254,7 @@ static inline void closure_queue(struct closure *cl)
*/
static inline void closure_get(struct closure *cl)
{
-#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
+#ifdef CONFIG_DEBUG_CLOSURES
BUG_ON((atomic_inc_return(&cl->remaining) &
CLOSURE_REMAINING_MASK) <= 1);
#else
@@ -271,7 +270,7 @@ static inline void closure_get(struct closure *cl)
*/
static inline void closure_init(struct closure *cl, struct closure *parent)
{
- memset(cl, 0, sizeof(struct closure));
+ cl->fn = NULL;
cl->parent = parent;
if (parent)
closure_get(parent);
diff --git a/lib/Kconfig b/lib/Kconfig
index ce2abffb9e..1aa1c15a83 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -504,6 +504,9 @@ config ASSOCIATIVE_ARRAY

for more information.

+config CLOSURES
+ bool
+
config HAS_IOMEM
bool
depends on !NO_IOMEM
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 39d1d93164..3dba7a9aff 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1618,6 +1618,15 @@ config DEBUG_NOTIFIERS
This is a relatively cheap check but if you care about maximum
performance, say N.

+config DEBUG_CLOSURES
+ bool "Debug closures (bcache async widgits)"
+ depends on CLOSURES
+ select DEBUG_FS
+ help
+ Keeps all active closures in a linked list and provides a debugfs
+ interface to list them, which makes it possible to see asynchronous
+ operations that get stuck.
+
config BUG_ON_DATA_CORRUPTION
bool "Trigger a BUG when data corruption is detected"
select DEBUG_LIST
diff --git a/lib/Makefile b/lib/Makefile
index baf2821f7a..fd13ca6e0e 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -245,6 +245,8 @@ obj-$(CONFIG_ATOMIC64_SELFTEST) += atomic64_test.o

obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o

+obj-$(CONFIG_CLOSURES) += closure.o
+
obj-$(CONFIG_DQL) += dynamic_queue_limits.o

obj-$(CONFIG_GLOB) += glob.o
diff --git a/drivers/md/bcache/closure.c b/lib/closure.c
similarity index 88%
rename from drivers/md/bcache/closure.c
rename to lib/closure.c
index d8d9394a6b..b38ded00b9 100644
--- a/drivers/md/bcache/closure.c
+++ b/lib/closure.c
@@ -6,13 +6,12 @@
* Copyright 2012 Google, Inc.
*/

+#include <linux/closure.h>
#include <linux/debugfs.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/seq_file.h>
#include <linux/sched/debug.h>

-#include "closure.h"
-
static inline void closure_put_after_sub(struct closure *cl, int flags)
{
int r = flags & CLOSURE_REMAINING_MASK;
@@ -45,6 +44,7 @@ void closure_sub(struct closure *cl, int v)
{
closure_put_after_sub(cl, atomic_sub_return(v, &cl->remaining));
}
+EXPORT_SYMBOL(closure_sub);

/*
* closure_put - decrement a closure's refcount
@@ -53,6 +53,7 @@ void closure_put(struct closure *cl)
{
closure_put_after_sub(cl, atomic_dec_return(&cl->remaining));
}
+EXPORT_SYMBOL(closure_put);

/*
* closure_wake_up - wake up all closures on a wait list, without memory barrier
@@ -74,6 +75,7 @@ void __closure_wake_up(struct closure_waitlist *wait_list)
closure_sub(cl, CLOSURE_WAITING + 1);
}
}
+EXPORT_SYMBOL(__closure_wake_up);

/**
* closure_wait - add a closure to a waitlist
@@ -93,6 +95,7 @@ bool closure_wait(struct closure_waitlist *waitlist, struct closure *cl)

return true;
}
+EXPORT_SYMBOL(closure_wait);

struct closure_syncer {
struct task_struct *task;
@@ -127,8 +130,9 @@ void __sched __closure_sync(struct closure *cl)

__set_current_state(TASK_RUNNING);
}
+EXPORT_SYMBOL(__closure_sync);

-#ifdef CONFIG_BCACHE_CLOSURES_DEBUG
+#ifdef CONFIG_DEBUG_CLOSURES

static LIST_HEAD(closure_list);
static DEFINE_SPINLOCK(closure_list_lock);
@@ -144,6 +148,7 @@ void closure_debug_create(struct closure *cl)
list_add(&cl->all, &closure_list);
spin_unlock_irqrestore(&closure_list_lock, flags);
}
+EXPORT_SYMBOL(closure_debug_create);

void closure_debug_destroy(struct closure *cl)
{
@@ -156,8 +161,7 @@ void closure_debug_destroy(struct closure *cl)
list_del(&cl->all);
spin_unlock_irqrestore(&closure_list_lock, flags);
}
-
-static struct dentry *closure_debug;
+EXPORT_SYMBOL(closure_debug_destroy);

static int debug_show(struct seq_file *f, void *data)
{
@@ -181,7 +185,7 @@ static int debug_show(struct seq_file *f, void *data)
seq_printf(f, " W %pS\n",
(void *) cl->waiting_on);

- seq_printf(f, "\n");
+ seq_puts(f, "\n");
}

spin_unlock_irq(&closure_list_lock);
@@ -190,18 +194,11 @@ static int debug_show(struct seq_file *f, void *data)

DEFINE_SHOW_ATTRIBUTE(debug);

-void __init closure_debug_init(void)
+static int __init closure_debug_init(void)
{
- if (!IS_ERR_OR_NULL(bcache_debug))
- /*
- * it is unnecessary to check return value of
- * debugfs_create_file(), we should not care
- * about this.
- */
- closure_debug = debugfs_create_file(
- "closures", 0400, bcache_debug, NULL, &debug_fops);
+ debugfs_create_file("closures", 0400, NULL, NULL, &debug_fops);
+ return 0;
}
-#endif
+late_initcall(closure_debug_init)

-MODULE_AUTHOR("Kent Overstreet <koverstreet@google.com>");
-MODULE_LICENSE("GPL");
+#endif
--
2.40.1