From patchwork Tue Nov 24 13:27:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11929023 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 707ECC6379D for ; Tue, 24 Nov 2020 13:40:50 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B0D1920872 for ; Tue, 24 Nov 2020 13:40:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="YCNB4naC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0D1920872 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.36141.68054 (Exim 4.92) (envelope-from ) id 1khYYa-00050w-Or; Tue, 24 Nov 2020 13:40:32 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 36141.68054; Tue, 24 Nov 2020 13:40:32 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khYYY-0004z5-P5; Tue, 24 Nov 2020 13:40:30 +0000 Received: by outflank-mailman (input) for mailman id 36141; Tue, 24 Nov 2020 13:40:22 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khYQd-0000Qf-7X for xen-devel@lists.xenproject.org; Tue, 24 Nov 2020 13:32:19 +0000 Received: from casper.infradead.org (unknown [2001:8b0:10b:1236::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id f880fac1-f1cc-4be6-9256-93d08272d6b8; Tue, 24 Nov 2020 13:29:23 +0000 (UTC) Received: from [2001:4bb8:180:5443:c70:4a89:bc61:3] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1khYNM-0006gV-JV; Tue, 24 Nov 2020 13:28:57 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khYQd-0000Qf-7X for xen-devel@lists.xenproject.org; Tue, 24 Nov 2020 13:32:19 +0000 X-Inumbo-ID: f880fac1-f1cc-4be6-9256-93d08272d6b8 Received: from casper.infradead.org (unknown [2001:8b0:10b:1236::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id f880fac1-f1cc-4be6-9256-93d08272d6b8; Tue, 24 Nov 2020 13:29:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=hd58vTxwYflslTooUzvIkiEUZh8oqfMehzvRdiTDmRg=; b=YCNB4naCKZWhAaCsg1kYokxu80 rDFjtrYT7lEuIA8sVbt3CobuCxtFPj2/8pE/tRoK9WUNzb1EdlB5LEPyHhE8AJLIRh3/PtVC8ov/2 mjdWUOy4bTyT5WfIjImo/Xyw0j7f7zyydciqCBDbZljVfC1fZErmHDGOhwC9Dzd0ePKxnsPI1bPv+ 6cChoKXYn89Zvu9rflA5Px/7sSzxUQ2digOs8X0WWZZ+SFnJJoixr4SYXxUPnXKXDp3K+ri7V80Kr UHQMztu7BO6hhSivmU18rXD88ntr13ZGE1Ci0+MS7lPzbgMA19Bp2MZIaWuGvdI9AR6vpqR8mTh6B IrrZC5xw==; Received: from [2001:4bb8:180:5443:c70:4a89:bc61:3] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1khYNM-0006gV-JV; Tue, 24 Nov 2020 13:28:57 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Konrad Rzeszutek Wilk , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Richard Weinberger , Jan Kara , linux-block@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 37/45] block: allocate struct hd_struct as part of struct bdev_inode Date: Tue, 24 Nov 2020 14:27:43 +0100 Message-Id: <20201124132751.3747337-38-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201124132751.3747337-1-hch@lst.de> References: <20201124132751.3747337-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Allocate hd_struct together with struct block_device to pre-load the lifetime rule changes in preparation of merging the two structures. Note that part0 was previously embedded into struct gendisk, but is a separate allocation now, and already points to the block_device instead of the hd_struct. The lifetime of struct gendisk is still controlled by the struct device embedded in the part0 hd_struct. Signed-off-by: Christoph Hellwig --- block/blk-core.c | 16 ++++--- block/blk-flush.c | 2 +- block/blk-merge.c | 2 - block/blk.h | 21 ---------- block/genhd.c | 50 +++++++++------------- block/partitions/core.c | 67 +++--------------------------- drivers/block/drbd/drbd_receiver.c | 2 +- drivers/block/drbd/drbd_worker.c | 3 +- drivers/block/zram/zram_drv.c | 2 +- drivers/md/dm.c | 4 +- drivers/md/md.c | 2 +- fs/block_dev.c | 37 +++++------------ include/linux/blk_types.h | 2 +- include/linux/genhd.h | 14 +++---- include/linux/part_stat.h | 4 +- 15 files changed, 60 insertions(+), 168 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index d64ffcb6f9ae5d..9ea70275fc1cfe 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -714,7 +714,8 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) static noinline int should_fail_bio(struct bio *bio) { - if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size)) + if (should_fail_request(bio->bi_disk->part0->bd_part, + bio->bi_iter.bi_size)) return -EIO; return 0; } @@ -831,7 +832,7 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio) if (unlikely(blk_partition_remap(bio))) goto end_io; } else { - if (unlikely(bio_check_ro(bio, &bio->bi_disk->part0))) + if (unlikely(bio_check_ro(bio, bio->bi_disk->part0->bd_part))) goto end_io; if (unlikely(bio_check_eod(bio, get_capacity(bio->bi_disk)))) goto end_io; @@ -1203,7 +1204,7 @@ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request * return ret; if (rq->rq_disk && - should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq))) + should_fail_request(rq->rq_disk->part0->bd_part, blk_rq_bytes(rq))) return BLK_STS_IOERR; if (blk_crypto_insert_cloned_request(rq)) @@ -1272,7 +1273,7 @@ static void update_io_ticks(struct hd_struct *part, unsigned long now, bool end) __part_stat_add(part, io_ticks, end ? now - stamp : 1); } if (part->partno) { - part = &part_to_disk(part)->part0; + part = part_to_disk(part)->part0->bd_part; goto again; } } @@ -1309,8 +1310,6 @@ void blk_account_io_done(struct request *req, u64 now) part_stat_inc(part, ios[sgrp]); part_stat_add(part, nsecs[sgrp], now - req->start_time_ns); part_stat_unlock(); - - hd_struct_put(part); } } @@ -1354,7 +1353,7 @@ EXPORT_SYMBOL_GPL(part_start_io_acct); unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, unsigned int op) { - return __part_start_io_acct(&disk->part0, sectors, op); + return __part_start_io_acct(disk->part0->bd_part, sectors, op); } EXPORT_SYMBOL(disk_start_io_acct); @@ -1376,14 +1375,13 @@ void part_end_io_acct(struct hd_struct *part, struct bio *bio, unsigned long start_time) { __part_end_io_acct(part, bio_op(bio), start_time); - hd_struct_put(part); } EXPORT_SYMBOL_GPL(part_end_io_acct); void disk_end_io_acct(struct gendisk *disk, unsigned int op, unsigned long start_time) { - __part_end_io_acct(&disk->part0, op, start_time); + __part_end_io_acct(disk->part0->bd_part, op, start_time); } EXPORT_SYMBOL(disk_end_io_acct); diff --git a/block/blk-flush.c b/block/blk-flush.c index e32958f0b68750..fcd0a60574dff8 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -139,7 +139,7 @@ static void blk_flush_queue_rq(struct request *rq, bool add_front) static void blk_account_io_flush(struct request *rq) { - struct hd_struct *part = &rq->rq_disk->part0; + struct hd_struct *part = rq->rq_disk->part0->bd_part; part_stat_lock(); part_stat_inc(part, ios[STAT_FLUSH]); diff --git a/block/blk-merge.c b/block/blk-merge.c index bcf5e458060337..cb351ab9b77dbd 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -683,8 +683,6 @@ static void blk_account_io_merge_request(struct request *req) part_stat_lock(); part_stat_inc(req->part, merges[op_stat_group(req_op(req))]); part_stat_unlock(); - - hd_struct_put(req->part); } } diff --git a/block/blk.h b/block/blk.h index 0bd4b58bcbaf77..32ac41f7557fcc 100644 --- a/block/blk.h +++ b/block/blk.h @@ -363,27 +363,6 @@ int bdev_del_partition(struct block_device *bdev, int partno); int bdev_resize_partition(struct block_device *bdev, int partno, sector_t start, sector_t length); int disk_expand_part_tbl(struct gendisk *disk, int target); -int hd_ref_init(struct hd_struct *part); - -/* no need to get/put refcount of part0 */ -static inline int hd_struct_try_get(struct hd_struct *part) -{ - if (part->partno) - return percpu_ref_tryget_live(&part->ref); - return 1; -} - -static inline void hd_struct_put(struct hd_struct *part) -{ - if (part->partno) - percpu_ref_put(&part->ref); -} - -static inline void hd_free_part(struct hd_struct *part) -{ - bdput(part->bdev); - percpu_ref_exit(&part->ref); -} int bio_add_hw_page(struct request_queue *q, struct bio *bio, struct page *page, unsigned int len, unsigned int offset, diff --git a/block/genhd.c b/block/genhd.c index 8aed77cc8ad169..3bbf6d3a69ec63 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -40,7 +40,7 @@ static void disk_release_events(struct gendisk *disk); void set_capacity(struct gendisk *disk, sector_t sectors) { - struct block_device *bdev = disk->part0.bdev; + struct block_device *bdev = disk->part0; spin_lock(&bdev->bd_size_lock); i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); @@ -308,9 +308,7 @@ static inline int sector_in_part(struct hd_struct *part, sector_t sector) * primarily used for stats accounting. * * CONTEXT: - * RCU read locked. The returned partition pointer is always valid - * because its refcount is grabbed except for part0, which lifetime - * is same with the disk. + * RCU read locked. * * RETURNS: * Found partition on success, part0 is returned if no partition matches @@ -326,26 +324,19 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) ptbl = rcu_dereference(disk->part_tbl); part = rcu_dereference(ptbl->last_lookup); - if (part && sector_in_part(part, sector) && hd_struct_try_get(part)) + if (part && sector_in_part(part, sector)) goto out_unlock; for (i = 1; i < ptbl->len; i++) { part = rcu_dereference(ptbl->part[i]); if (part && sector_in_part(part, sector)) { - /* - * only live partition can be cached for lookup, - * so use-after-free on cached & deleting partition - * can be avoided - */ - if (!hd_struct_try_get(part)) - break; rcu_assign_pointer(ptbl->last_lookup, part); goto out_unlock; } } - part = &disk->part0; + part = disk->part0->bd_part; out_unlock: rcu_read_unlock(); return part; @@ -671,8 +662,8 @@ static void register_disk(struct device *parent, struct gendisk *disk, */ pm_runtime_set_memalloc_noio(ddev, true); - disk->part0.bdev->bd_holder_dir = - kobject_create_and_add("holders", &ddev->kobj); + disk->part0->bd_holder_dir = + kobject_create_and_add("holders", &ddev->kobj); disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); if (disk->flags & GENHD_FL_HIDDEN) { @@ -738,7 +729,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, disk->flags |= GENHD_FL_UP; - retval = blk_alloc_devt(&disk->part0, &devt); + retval = blk_alloc_devt(disk->part0->bd_part, &devt); if (retval) { WARN_ON(1); return; @@ -765,7 +756,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk, ret = bdi_register(bdi, "%u:%u", MAJOR(devt), MINOR(devt)); WARN_ON(ret); bdi_set_owner(bdi, dev); - bdev_add(disk->part0.bdev, devt); + bdev_add(disk->part0, devt); } register_disk(parent, disk, groups); if (register_queue) @@ -872,11 +863,11 @@ void del_gendisk(struct gendisk *disk) blk_unregister_queue(disk); - kobject_put(disk->part0.bdev->bd_holder_dir); + kobject_put(disk->part0->bd_holder_dir); kobject_put(disk->slave_dir); - part_stat_set_all(&disk->part0, 0); - disk->part0.bdev->bd_stamp = 0; + part_stat_set_all(disk->part0->bd_part, 0); + disk->part0->bd_stamp = 0; if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); @@ -989,7 +980,7 @@ void __init printk_all_partitions(void) */ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) { - bool is_part0 = part == &disk->part0; + bool is_part0 = part == disk->part0->bd_part; printk("%s%s %10llu %s %s", is_part0 ? "" : " ", bdevt_str(part_devt(part), devt_buf), @@ -1444,7 +1435,7 @@ static void disk_release(struct device *dev) disk_release_events(disk); kfree(disk->random); disk_replace_part_tbl(disk, NULL); - hd_free_part(&disk->part0); + bdput(disk->part0); if (disk->queue) blk_put_queue(disk->queue); kfree_rcu(disk, rcu); @@ -1610,8 +1601,8 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) if (!disk) return NULL; - disk->part0.bdev = bdev_alloc(disk, 0); - if (!disk->part0.bdev) + disk->part0 = bdev_alloc(disk, 0); + if (!disk->part0) goto out_free_disk; disk->node_id = node_id; @@ -1619,10 +1610,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) goto out_bdput; ptbl = rcu_dereference_protected(disk->part_tbl, 1); - rcu_assign_pointer(ptbl->part[0], &disk->part0); - - if (hd_ref_init(&disk->part0)) - goto out_bdput; + rcu_assign_pointer(ptbl->part[0], disk->part0->bd_part); disk->minors = minors; rand_initialize_disk(disk); @@ -1632,7 +1620,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) return disk; out_bdput: - bdput(disk->part0.bdev); + bdput(disk->part0); out_free_disk: kfree(disk); return NULL; @@ -1671,9 +1659,9 @@ void set_disk_ro(struct gendisk *disk, int flag) struct disk_part_iter piter; struct hd_struct *part; - if (disk->part0.bdev->bd_read_only != flag) { + if (disk->part0->bd_read_only != flag) { set_disk_ro_uevent(disk, flag); - disk->part0.bdev->bd_read_only = flag; + disk->part0->bd_read_only = flag; } disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); diff --git a/block/partitions/core.c b/block/partitions/core.c index fd00428e437a63..4b0352cb29e132 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -265,9 +265,9 @@ static const struct attribute_group *part_attr_groups[] = { static void part_release(struct device *dev) { struct hd_struct *p = dev_to_part(dev); + blk_free_devt(dev->devt); - hd_free_part(p); - kfree(p); + bdput(p->bdev); } static int part_uevent(struct device *dev, struct kobj_uevent_env *env) @@ -288,46 +288,6 @@ struct device_type part_type = { .uevent = part_uevent, }; -static void hd_struct_free_work(struct work_struct *work) -{ - struct hd_struct *part = - container_of(to_rcu_work(work), struct hd_struct, rcu_work); - struct gendisk *disk = part_to_disk(part); - - /* - * Release the disk reference acquired in delete_partition here. - * We can't release it in hd_struct_free because the final put_device - * needs process context and thus can't be run directly from a - * percpu_ref ->release handler. - */ - put_device(disk_to_dev(disk)); - - part->bdev->bd_start_sect = 0; - bdev_set_nr_sectors(part->bdev, 0); - part_stat_set_all(part, 0); - put_device(part_to_dev(part)); -} - -static void hd_struct_free(struct percpu_ref *ref) -{ - struct hd_struct *part = container_of(ref, struct hd_struct, ref); - struct gendisk *disk = part_to_disk(part); - struct disk_part_tbl *ptbl = - rcu_dereference_protected(disk->part_tbl, 1); - - rcu_assign_pointer(ptbl->last_lookup, NULL); - - INIT_RCU_WORK(&part->rcu_work, hd_struct_free_work); - queue_rcu_work(system_wq, &part->rcu_work); -} - -int hd_ref_init(struct hd_struct *part) -{ - if (percpu_ref_init(&part->ref, hd_struct_free, 0, GFP_KERNEL)) - return -ENOMEM; - return 0; -} - /* * Must be called either with bd_mutex held, before a disk can be opened or * after all disk users are gone. @@ -342,8 +302,8 @@ void delete_partition(struct hd_struct *part) * ->part_tbl is referenced in this part's release handler, so * we have to hold the disk device */ - get_device(disk_to_dev(disk)); rcu_assign_pointer(ptbl->part[part->partno], NULL); + rcu_assign_pointer(ptbl->last_lookup, NULL); kobject_put(part->bdev->bd_holder_dir); device_del(part_to_dev(part)); @@ -353,7 +313,7 @@ void delete_partition(struct hd_struct *part) */ remove_inode_hash(part->bdev->bd_inode); - percpu_ref_kill(&part->ref); + put_device(part_to_dev(part)); } static ssize_t whole_disk_show(struct device *dev, @@ -406,15 +366,11 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, if (ptbl->part[partno]) return ERR_PTR(-EBUSY); - p = kzalloc(sizeof(*p), GFP_KERNEL); - if (!p) - return ERR_PTR(-EBUSY); - bdev = bdev_alloc(disk, partno); if (!bdev) - goto out_free; - p->bdev = bdev; + return ERR_PTR(-ENOMEM); + p = bdev->bd_part; pdev = part_to_dev(p); bdev->bd_start_sect = start; @@ -463,13 +419,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, goto out_del; } - err = hd_ref_init(p); - if (err) { - if (flags & ADDPART_FLAG_WHOLEDISK) - goto out_remove_file; - goto out_del; - } - /* everything is up and running, commence */ bdev_add(bdev, devt); rcu_assign_pointer(ptbl->part[partno], p); @@ -481,11 +430,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno, out_bdput: bdput(bdev); -out_free: - kfree(p); return ERR_PTR(err); -out_remove_file: - device_remove_file(pdev, &dev_attr_whole_disk); out_del: kobject_put(bdev->bd_holder_dir); device_del(pdev); diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index dc333dbe523281..9e5c2fdfda3629 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -2802,7 +2802,7 @@ bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) if (c_min_rate == 0) return false; - curr_events = (int)part_stat_read_accum(&disk->part0, sectors) - + curr_events = (int)part_stat_read_accum(disk->part0->bd_part, sectors) - atomic_read(&device->rs_sect_ev); if (atomic_read(&device->ap_actlog_cnt) diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index ba56f3f05312f0..343f56b86bb766 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -1678,7 +1678,8 @@ void drbd_rs_controller_reset(struct drbd_device *device) atomic_set(&device->rs_sect_in, 0); atomic_set(&device->rs_sect_ev, 0); device->rs_in_flight = 0; - device->rs_last_events = (int)part_stat_read_accum(&disk->part0, sectors); + device->rs_last_events = + (int)part_stat_read_accum(disk->part0->bd_part, sectors); /* Updating the RCU protected object in place is necessary since this function gets called from atomic context. diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 88baa6158eaee1..153858734cd47d 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1687,7 +1687,7 @@ static void zram_reset_device(struct zram *zram) zram->disksize = 0; set_capacity_and_notify(zram->disk, 0); - part_stat_set_all(&zram->disk->part0, 0); + part_stat_set_all(zram->disk->part0->bd_part, 0); up_write(&zram->init_lock); /* I/O operation under all of CPU are done so let's free */ diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 48051db006f30c..1b2db4d530ea71 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1607,7 +1607,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md, * (by eliminating DM's splitting and just using bio_split) */ part_stat_lock(); - __dm_part_stat_sub(&dm_disk(md)->part0, + __dm_part_stat_sub(dm_disk(md)->part0->bd_part, sectors[op_stat_group(bio_op(bio))], ci.sector_count); part_stat_unlock(); @@ -2242,7 +2242,7 @@ EXPORT_SYMBOL_GPL(dm_put); static bool md_in_flight_bios(struct mapped_device *md) { int cpu; - struct hd_struct *part = &dm_disk(md)->part0; + struct hd_struct *part = dm_disk(md)->part0->bd_part; long sum = 0; for_each_possible_cpu(cpu) { diff --git a/drivers/md/md.c b/drivers/md/md.c index 7ce6047c856ea2..3696c2d77a4dd7 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8441,7 +8441,7 @@ static int is_mddev_idle(struct mddev *mddev, int init) rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { struct gendisk *disk = rdev->bdev->bd_disk; - curr_events = (int)part_stat_read_accum(&disk->part0, sectors) - + curr_events = (int)part_stat_read_accum(disk->part0->bd_part, sectors) - atomic_read(&disk->sync_io); /* sync IO will cause sync_io to increase before the disk_stats * as sync_io is counted when a request starts, and diff --git a/fs/block_dev.c b/fs/block_dev.c index 0b8d6009486643..1538b20ca4bd43 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -39,6 +39,7 @@ struct bdev_inode { struct block_device bdev; + struct hd_struct hd; struct inode vfs_inode; }; @@ -885,6 +886,9 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) iput(inode); return NULL; } + bdev->bd_part = &BDEV_I(inode)->hd; + memset(bdev->bd_part, 0, sizeof(*bdev->bd_part)); + bdev->bd_part->bdev = bdev; return bdev; } @@ -1275,15 +1279,10 @@ EXPORT_SYMBOL_GPL(bdev_disk_changed); static int __blkdev_get(struct block_device *bdev, fmode_t mode) { struct gendisk *disk = bdev->bd_disk; - int ret; + int ret = 0; if (!bdev->bd_openers) { if (!bdev_is_partition(bdev)) { - ret = -ENXIO; - bdev->bd_part = disk_get_part(disk, 0); - if (!bdev->bd_part) - goto out_clear; - ret = 0; if (disk->fops->open) ret = disk->fops->open(bdev, mode); @@ -1302,7 +1301,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) bdev_disk_changed(bdev, ret == -ENOMEDIUM); if (ret) - goto out_clear; + return ret; } else { struct block_device *whole = bdget_disk(disk, 0); @@ -1311,16 +1310,14 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) if (ret) { mutex_unlock(&whole->bd_mutex); bdput(whole); - goto out_clear; + return ret; } whole->bd_part_count++; mutex_unlock(&whole->bd_mutex); - bdev->bd_part = disk_get_part(disk, bdev->bd_partno); if (!bdev_nr_sectors(bdev)) { __blkdev_put(whole, mode, 1); - ret = -ENXIO; - goto out_clear; + return -ENXIO; } set_init_blocksize(bdev); } @@ -1329,7 +1326,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); } else { if (!bdev_is_partition(bdev)) { - ret = 0; if (bdev->bd_disk->fops->open) ret = bdev->bd_disk->fops->open(bdev, mode); /* the same as first opener case, read comment there */ @@ -1342,11 +1338,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode) } bdev->bd_openers++; return 0; - - out_clear: - disk_put_part(bdev->bd_part); - bdev->bd_part = NULL; - return ret; } static struct block_device *get_bdev_disk_and_module(dev_t dev) @@ -1569,18 +1560,12 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) sync_blockdev(bdev); kill_bdev(bdev); bdev_write_inode(bdev); - - if (!bdev_is_partition(bdev) && disk->fops->release) - disk->fops->release(disk, mode); - - disk_put_part(bdev->bd_part); - bdev->bd_part = NULL; if (bdev_is_partition(bdev)) victim = bdev_whole(bdev); - } else { - if (!bdev_is_partition(bdev) && disk->fops->release) - disk->fops->release(disk, mode); } + + if (!bdev_is_partition(bdev) && disk->fops->release) + disk->fops->release(disk, mode); mutex_unlock(&bdev->bd_mutex); bdput(bdev); if (victim) diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 758cf71c9aa2a6..6edea5c1625909 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -59,7 +59,7 @@ struct block_device { } __randomize_layout; #define bdev_whole(_bdev) \ - ((_bdev)->bd_disk->part0.bdev) + ((_bdev)->bd_disk->part0) #define bdev_kobj(_bdev) \ (&part_to_dev((_bdev)->bd_part)->kobj) diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 08d00b526b0a3b..6e16c264439bdb 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -19,11 +19,12 @@ #include #include -#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) #define dev_to_part(device) container_of((device), struct hd_struct, __dev) -#define disk_to_dev(disk) (&(disk)->part0.__dev) #define part_to_dev(part) (&((part)->__dev)) +#define dev_to_disk(device) (dev_to_part(device)->bdev->bd_disk) +#define disk_to_dev(disk) (part_to_dev((disk)->part0->bd_part)) + extern const struct device_type disk_type; extern struct device_type part_type; extern struct class block_class; @@ -51,12 +52,9 @@ struct partition_meta_info { }; struct hd_struct { - struct percpu_ref ref; - struct block_device *bdev; struct device __dev; int partno; - struct rcu_work rcu_work; }; /** @@ -168,7 +166,7 @@ struct gendisk { * helpers. */ struct disk_part_tbl __rcu *part_tbl; - struct hd_struct part0; + struct block_device *part0; const struct block_device_operations *fops; struct request_queue *queue; @@ -279,7 +277,7 @@ extern void set_disk_ro(struct gendisk *disk, int flag); static inline int get_disk_ro(struct gendisk *disk) { - return disk->part0.bdev->bd_read_only; + return disk->part0->bd_read_only; } extern void disk_block_events(struct gendisk *disk); @@ -303,7 +301,7 @@ static inline sector_t bdev_nr_sectors(struct block_device *bdev) static inline sector_t get_capacity(struct gendisk *disk) { - return bdev_nr_sectors(disk->part0.bdev); + return bdev_nr_sectors(disk->part0); } int bdev_disk_changed(struct block_device *bdev, bool invalidate); diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h index 87ad60106e1db0..680de036691ef9 100644 --- a/include/linux/part_stat.h +++ b/include/linux/part_stat.h @@ -59,8 +59,8 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) #define part_stat_add(part, field, addnd) do { \ __part_stat_add((part), field, addnd); \ if ((part)->partno) \ - __part_stat_add(&part_to_disk((part))->part0, \ - field, addnd); \ + __part_stat_add(part_to_disk((part))->part0->bd_part, \ + field, addnd); \ } while (0) #define part_stat_dec(part, field) \