From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kent Overstreet Subject: [PATCH] md: Unify mddev destruction paths Date: Thu, 7 Jun 2018 20:52:54 -0400 Message-ID: <20180608005254.6692-1-kent.overstreet@gmail.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: axboe@kernel.dk, shli@kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org Cc: Kent Overstreet List-Id: linux-raid.ids Previously, mddev_put() had a couple different paths for freeing a mddev, due to the fact that the kobject wasn't initialized when the mddev was first allocated. If we move the kobject_init() to when it's first allocated and just use kobject_add() later, we can clean all this up. This also removes a hack in mddev_put() to avoid freeing biosets under a spinlock, which involved copying biosets on the stack after the reset bioset_init() changes. Signed-off-by: Kent Overstreet --- drivers/md/md.c | 53 +++++++++++++++++-------------------------------- 1 file changed, 18 insertions(+), 35 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index fc692b7128..22203eba1e 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -84,6 +84,8 @@ static void autostart_arrays(int part); static LIST_HEAD(pers_list); static DEFINE_SPINLOCK(pers_lock); +static struct kobj_type md_ktype; + struct md_cluster_operations *md_cluster_ops; EXPORT_SYMBOL(md_cluster_ops); struct module *md_cluster_mod; @@ -510,11 +512,6 @@ static void mddev_delayed_delete(struct work_struct *ws); static void mddev_put(struct mddev *mddev) { - struct bio_set bs, sync_bs; - - memset(&bs, 0, sizeof(bs)); - memset(&sync_bs, 0, sizeof(sync_bs)); - if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) return; if (!mddev->raid_disks && list_empty(&mddev->disks) && @@ -522,30 +519,23 @@ static void mddev_put(struct mddev *mddev) /* Array is not configured at all, and not held active, * so destroy it */ list_del_init(&mddev->all_mddevs); - bs = mddev->bio_set; - sync_bs = mddev->sync_set; - memset(&mddev->bio_set, 0, sizeof(mddev->bio_set)); - memset(&mddev->sync_set, 0, sizeof(mddev->sync_set)); - if (mddev->gendisk) { - /* We did a probe so need to clean up. Call - * queue_work inside the spinlock so that - * flush_workqueue() after mddev_find will - * succeed in waiting for the work to be done. - */ - INIT_WORK(&mddev->del_work, mddev_delayed_delete); - queue_work(md_misc_wq, &mddev->del_work); - } else - kfree(mddev); + + /* + * Call queue_work inside the spinlock so that + * flush_workqueue() after mddev_find will succeed in waiting + * for the work to be done. + */ + INIT_WORK(&mddev->del_work, mddev_delayed_delete); + queue_work(md_misc_wq, &mddev->del_work); } spin_unlock(&all_mddevs_lock); - bioset_exit(&bs); - bioset_exit(&sync_bs); } static void md_safemode_timeout(struct timer_list *t); void mddev_init(struct mddev *mddev) { + kobject_init(&mddev->kobj, &md_ktype); mutex_init(&mddev->open_mutex); mutex_init(&mddev->reconfig_mutex); mutex_init(&mddev->bitmap_info.mutex); @@ -5215,6 +5205,8 @@ static void md_free(struct kobject *ko) put_disk(mddev->gendisk); percpu_ref_exit(&mddev->writes_pending); + bioset_exit(&mddev->bio_set); + bioset_exit(&mddev->sync_set); kfree(mddev); } @@ -5348,8 +5340,7 @@ static int md_alloc(dev_t dev, char *name) mutex_lock(&mddev->open_mutex); add_disk(disk); - error = kobject_init_and_add(&mddev->kobj, &md_ktype, - &disk_to_dev(disk)->kobj, "%s", "md"); + error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md"); if (error) { /* This isn't possible, but as kobject_init_and_add is marked * __must_check, we must do something with the result @@ -5506,7 +5497,7 @@ int md_run(struct mddev *mddev) if (!bioset_initialized(&mddev->sync_set)) { err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); if (err) - goto abort; + return err; } spin_lock(&pers_lock); @@ -5519,8 +5510,7 @@ int md_run(struct mddev *mddev) else pr_warn("md: personality for level %s is not loaded!\n", mddev->clevel); - err = -EINVAL; - goto abort; + return -EINVAL; } spin_unlock(&pers_lock); if (mddev->level != pers->level) { @@ -5533,8 +5523,7 @@ int md_run(struct mddev *mddev) pers->start_reshape == NULL) { /* This personality cannot handle reshaping... */ module_put(pers->owner); - err = -EINVAL; - goto abort; + return -EINVAL; } if (pers->sync_request) { @@ -5603,7 +5592,7 @@ int md_run(struct mddev *mddev) mddev->private = NULL; module_put(pers->owner); bitmap_destroy(mddev); - goto abort; + return err; } if (mddev->queue) { bool nonrot = true; @@ -5665,12 +5654,6 @@ int md_run(struct mddev *mddev) sysfs_notify_dirent_safe(mddev->sysfs_action); sysfs_notify(&mddev->kobj, NULL, "degraded"); return 0; - -abort: - bioset_exit(&mddev->bio_set); - bioset_exit(&mddev->sync_set); - - return err; } EXPORT_SYMBOL_GPL(md_run); -- 2.17.1