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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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7eb30fe18f
Remove obsolete function vdo_perform_once. Instead, initialize necessary module state when loading the module. Signed-off-by: Matthew Sakai <msakai@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2023 Red Hat
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*/
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#include "thread-utils.h"
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#include <asm/current.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <linux/types.h>
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#include "errors.h"
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#include "logger.h"
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#include "memory-alloc.h"
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static struct hlist_head thread_list;
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static struct mutex thread_mutex;
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struct thread {
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void (*thread_function)(void *thread_data);
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void *thread_data;
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struct hlist_node thread_links;
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struct task_struct *thread_task;
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struct completion thread_done;
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};
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void vdo_initialize_threads_mutex(void)
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{
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mutex_init(&thread_mutex);
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}
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static int thread_starter(void *arg)
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{
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struct registered_thread allocating_thread;
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struct thread *thread = arg;
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thread->thread_task = current;
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mutex_lock(&thread_mutex);
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hlist_add_head(&thread->thread_links, &thread_list);
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mutex_unlock(&thread_mutex);
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vdo_register_allocating_thread(&allocating_thread, NULL);
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thread->thread_function(thread->thread_data);
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vdo_unregister_allocating_thread();
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complete(&thread->thread_done);
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return 0;
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}
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int vdo_create_thread(void (*thread_function)(void *), void *thread_data,
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const char *name, struct thread **new_thread)
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{
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char *name_colon = strchr(name, ':');
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char *my_name_colon = strchr(current->comm, ':');
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struct task_struct *task;
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struct thread *thread;
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int result;
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result = vdo_allocate(1, struct thread, __func__, &thread);
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if (result != VDO_SUCCESS) {
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vdo_log_warning("Error allocating memory for %s", name);
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return result;
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}
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thread->thread_function = thread_function;
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thread->thread_data = thread_data;
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init_completion(&thread->thread_done);
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/*
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* Start the thread, with an appropriate thread name.
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*
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* If the name supplied contains a colon character, use that name. This causes uds module
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* threads to have names like "uds:callbackW" and the main test runner thread to be named
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* "zub:runtest".
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*
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* Otherwise if the current thread has a name containing a colon character, prefix the name
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* supplied with the name of the current thread up to (and including) the colon character.
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* Thus when the "kvdo0:dedupeQ" thread opens an index session, all the threads associated
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* with that index will have names like "kvdo0:foo".
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*
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* Otherwise just use the name supplied. This should be a rare occurrence.
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*/
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if ((name_colon == NULL) && (my_name_colon != NULL)) {
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task = kthread_run(thread_starter, thread, "%.*s:%s",
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(int) (my_name_colon - current->comm), current->comm,
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name);
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} else {
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task = kthread_run(thread_starter, thread, "%s", name);
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}
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if (IS_ERR(task)) {
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vdo_free(thread);
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return PTR_ERR(task);
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}
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*new_thread = thread;
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return VDO_SUCCESS;
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}
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void vdo_join_threads(struct thread *thread)
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{
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while (wait_for_completion_interruptible(&thread->thread_done))
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fsleep(1000);
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mutex_lock(&thread_mutex);
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hlist_del(&thread->thread_links);
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mutex_unlock(&thread_mutex);
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vdo_free(thread);
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}
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