diff options
Diffstat (limited to 'drivers/md/bcache/closure.c')
| -rw-r--r-- | drivers/md/bcache/closure.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/drivers/md/bcache/closure.c b/drivers/md/bcache/closure.c deleted file mode 100644 index d8d9394a6b..0000000000 --- a/drivers/md/bcache/closure.c +++ /dev/null @@ -1,207 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Asynchronous refcounty things - * - * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> - * Copyright 2012 Google, Inc. - */ - -#include <linux/debugfs.h> -#include <linux/module.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; - - BUG_ON(flags & CLOSURE_GUARD_MASK); - BUG_ON(!r && (flags & ~CLOSURE_DESTRUCTOR)); - - if (!r) { - if (cl->fn && !(flags & CLOSURE_DESTRUCTOR)) { - atomic_set(&cl->remaining, - CLOSURE_REMAINING_INITIALIZER); - closure_queue(cl); - } else { - struct closure *parent = cl->parent; - closure_fn *destructor = cl->fn; - - closure_debug_destroy(cl); - - if (destructor) - destructor(cl); - - if (parent) - closure_put(parent); - } - } -} - -/* For clearing flags with the same atomic op as a put */ -void closure_sub(struct closure *cl, int v) -{ - closure_put_after_sub(cl, atomic_sub_return(v, &cl->remaining)); -} - -/* - * closure_put - decrement a closure's refcount - */ -void closure_put(struct closure *cl) -{ - closure_put_after_sub(cl, atomic_dec_return(&cl->remaining)); -} - -/* - * 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; - struct closure *cl, *t; - struct llist_node *reverse = NULL; - - list = llist_del_all(&wait_list->list); - - /* We first reverse the list to preserve FIFO ordering and fairness */ - reverse = llist_reverse_order(list); - - /* Then do the wakeups */ - llist_for_each_entry_safe(cl, t, reverse, list) { - closure_set_waiting(cl, 0); - closure_sub(cl, CLOSURE_WAITING + 1); - } -} - -/** - * 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. - * @cl: closure pointer. - * - */ -bool closure_wait(struct closure_waitlist *waitlist, struct closure *cl) -{ - if (atomic_read(&cl->remaining) & CLOSURE_WAITING) - return false; - - closure_set_waiting(cl, _RET_IP_); - atomic_add(CLOSURE_WAITING + 1, &cl->remaining); - llist_add(&cl->list, &waitlist->list); - - return true; -} - -struct closure_syncer { - struct task_struct *task; - int done; -}; - -static void closure_sync_fn(struct closure *cl) -{ - struct closure_syncer *s = cl->s; - struct task_struct *p; - - rcu_read_lock(); - p = READ_ONCE(s->task); - s->done = 1; - wake_up_process(p); - rcu_read_unlock(); -} - -void __sched __closure_sync(struct closure *cl) -{ - struct closure_syncer s = { .task = current }; - - cl->s = &s; - continue_at(cl, closure_sync_fn, NULL); - - while (1) { - set_current_state(TASK_UNINTERRUPTIBLE); - if (s.done) - break; - schedule(); - } - - __set_current_state(TASK_RUNNING); -} - -#ifdef CONFIG_BCACHE_CLOSURES_DEBUG - -static LIST_HEAD(closure_list); -static DEFINE_SPINLOCK(closure_list_lock); - -void closure_debug_create(struct closure *cl) -{ - unsigned long flags; - - BUG_ON(cl->magic == CLOSURE_MAGIC_ALIVE); - cl->magic = CLOSURE_MAGIC_ALIVE; - - spin_lock_irqsave(&closure_list_lock, flags); - list_add(&cl->all, &closure_list); - spin_unlock_irqrestore(&closure_list_lock, flags); -} - -void closure_debug_destroy(struct closure *cl) -{ - unsigned long flags; - - BUG_ON(cl->magic != CLOSURE_MAGIC_ALIVE); - cl->magic = CLOSURE_MAGIC_DEAD; - - spin_lock_irqsave(&closure_list_lock, flags); - list_del(&cl->all); - spin_unlock_irqrestore(&closure_list_lock, flags); -} - -static struct dentry *closure_debug; - -static int debug_show(struct seq_file *f, void *data) -{ - struct closure *cl; - - spin_lock_irq(&closure_list_lock); - - list_for_each_entry(cl, &closure_list, all) { - int r = atomic_read(&cl->remaining); - - seq_printf(f, "%p: %pS -> %pS p %p r %i ", - cl, (void *) cl->ip, cl->fn, cl->parent, - r & CLOSURE_REMAINING_MASK); - - seq_printf(f, "%s%s\n", - test_bit(WORK_STRUCT_PENDING_BIT, - work_data_bits(&cl->work)) ? "Q" : "", - r & CLOSURE_RUNNING ? "R" : ""); - - if (r & CLOSURE_WAITING) - seq_printf(f, " W %pS\n", - (void *) cl->waiting_on); - - seq_printf(f, "\n"); - } - - spin_unlock_irq(&closure_list_lock); - return 0; -} - -DEFINE_SHOW_ATTRIBUTE(debug); - -void __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); -} -#endif - -MODULE_AUTHOR("Kent Overstreet <koverstreet@google.com>"); -MODULE_LICENSE("GPL"); |