From patchwork Tue Nov 21 11:19:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13462497 Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8FB40D9; Mon, 20 Nov 2023 19:25:31 -0800 (PST) Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4SZ8s04Trmz4f3m7b; Tue, 21 Nov 2023 11:25:24 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id D0E441A07AC; Tue, 21 Nov 2023 11:25:28 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP1 (Coremail) with SMTP id cCh0CgDX2xEmI1xlv3EABg--.26174S5; Tue, 21 Nov 2023 11:25:28 +0800 (CST) From: Yu Kuai To: ming.lei@redhat.com, axboe@kernel.dk Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [PATCH v2 1/2] block: introduce new field flags in block_device Date: Tue, 21 Nov 2023 19:19:26 +0800 Message-Id: <20231121111927.2021846-2-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231121111927.2021846-1-yukuai1@huaweicloud.com> References: <20231121111927.2021846-1-yukuai1@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: cCh0CgDX2xEmI1xlv3EABg--.26174S5 X-Coremail-Antispam: 1UD129KBjvJXoW3GryDCFy5trW8Gw18try7Jrb_yoW3uw1fpF Z8JFy5K3yUWr4fWan7Ga17JF1Sgw10kw1xA3y3C34akrW3trn2vF1kJryjy39a9rWxCFW7 XFn8CFW5CFy7ua7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBE14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2jI8I6cxK62vIxIIY0VWUZVW8XwA2048vs2IY02 0E87I2jVAFwI0_Jr4l82xGYIkIc2x26xkF7I0E14v26r1I6r4UM28lY4IEw2IIxxk0rwA2 F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjx v20xvEc7CjxVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2 z280aVCY1x0267AKxVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0V AKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1l Ox8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErc IFxwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v2 6r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2 Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_ Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMI IF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0pRxhLUUUUUU = X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ From: Yu Kuai There are multiple switches in struct block_device, use separate bool fields for them is not gracefully. Add a new field flags and replace swithes to a bit, there are no functional changes, and preare to add a new switch in the next patch. In order to keep flags in the first cacheline, define it as u32 and add new helpers to set/clear/test each bit like 'bio->bi_flags'. Signed-off-by: Yu Kuai Reviewed-by: Ming Lei --- block/bdev.c | 15 ++++++++------- block/blk-core.c | 7 ++++--- block/genhd.c | 15 +++++++++++---- block/ioctl.c | 6 +++++- include/linux/blk_types.h | 27 +++++++++++++++++++++------ include/linux/blkdev.h | 5 +++-- 6 files changed, 52 insertions(+), 23 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index fc8d28d77495..6b420cbd4f3d 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -408,10 +408,10 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) bdev->bd_partno = partno; bdev->bd_inode = inode; bdev->bd_queue = disk->queue; - if (partno) - bdev->bd_has_submit_bio = disk->part0->bd_has_submit_bio; + if (partno && bdev_flagged(disk->part0, BD_FLAG_HAS_SUBMIT_BIO)) + bdev_set_flag(bdev, BD_FLAG_HAS_SUBMIT_BIO); else - bdev->bd_has_submit_bio = false; + bdev_clear_flag(bdev, BD_FLAG_HAS_SUBMIT_BIO); bdev->bd_stats = alloc_percpu(struct disk_stats); if (!bdev->bd_stats) { iput(inode); @@ -612,7 +612,7 @@ static void bd_end_claim(struct block_device *bdev, void *holder) bdev->bd_holder = NULL; bdev->bd_holder_ops = NULL; mutex_unlock(&bdev->bd_holder_lock); - if (bdev->bd_write_holder) + if (bdev_flagged(bdev, BD_FLAG_WRITE_HOLDER)) unblock = true; } if (!whole->bd_holders) @@ -625,7 +625,7 @@ static void bd_end_claim(struct block_device *bdev, void *holder) */ if (unblock) { disk_unblock_events(bdev->bd_disk); - bdev->bd_write_holder = false; + bdev_clear_flag(bdev, BD_FLAG_WRITE_HOLDER); } } @@ -878,9 +878,10 @@ struct bdev_handle *bdev_open_by_dev(dev_t dev, blk_mode_t mode, void *holder, * writeable reference is too fragile given the way @mode is * used in blkdev_get/put(). */ - if ((mode & BLK_OPEN_WRITE) && !bdev->bd_write_holder && + if ((mode & BLK_OPEN_WRITE) && + !bdev_flagged(bdev, BD_FLAG_WRITE_HOLDER) && (disk->event_flags & DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE)) { - bdev->bd_write_holder = true; + bdev_set_flag(bdev, BD_FLAG_WRITE_HOLDER); unblock_events = false; } } diff --git a/block/blk-core.c b/block/blk-core.c index fdf25b8d6e78..f9f8b12ba626 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -482,7 +482,8 @@ __setup("fail_make_request=", setup_fail_make_request); bool should_fail_request(struct block_device *part, unsigned int bytes) { - return part->bd_make_it_fail && should_fail(&fail_make_request, bytes); + return bdev_flagged(part, BD_FLAG_MAKE_IT_FAIL) && + should_fail(&fail_make_request, bytes); } static int __init fail_make_request_debugfs(void) @@ -595,7 +596,7 @@ static void __submit_bio(struct bio *bio) if (unlikely(!blk_crypto_bio_prep(&bio))) return; - if (!bio->bi_bdev->bd_has_submit_bio) { + if (!bdev_flagged(bio->bi_bdev, BD_FLAG_HAS_SUBMIT_BIO)) { blk_mq_submit_bio(bio); } else if (likely(bio_queue_enter(bio) == 0)) { struct gendisk *disk = bio->bi_bdev->bd_disk; @@ -703,7 +704,7 @@ void submit_bio_noacct_nocheck(struct bio *bio) */ if (current->bio_list) bio_list_add(¤t->bio_list[0], bio); - else if (!bio->bi_bdev->bd_has_submit_bio) + else if (!bdev_flagged(bio->bi_bdev, BD_FLAG_HAS_SUBMIT_BIO)) __submit_bio_noacct_mq(bio); else __submit_bio_noacct(bio); diff --git a/block/genhd.c b/block/genhd.c index c9d06f72c587..57f96c0c8da0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -413,7 +413,8 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, elevator_init_mq(disk->queue); /* Mark bdev as having a submit_bio, if needed */ - disk->part0->bd_has_submit_bio = disk->fops->submit_bio != NULL; + if (disk->fops->submit_bio) + bdev_set_flag(disk->part0, BD_FLAG_HAS_SUBMIT_BIO); /* * If the driver provides an explicit major number it also must provide @@ -1062,7 +1063,8 @@ static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL); ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_make_it_fail); + return sprintf(buf, "%d\n", + bdev_flagged(dev_to_bdev(dev), BD_FLAG_MAKE_IT_FAIL)); } ssize_t part_fail_store(struct device *dev, @@ -1071,8 +1073,13 @@ ssize_t part_fail_store(struct device *dev, { int i; - if (count > 0 && sscanf(buf, "%d", &i) > 0) - dev_to_bdev(dev)->bd_make_it_fail = i; + if (count > 0 && sscanf(buf, "%d", &i) > 0) { + if (!i) + bdev_clear_flag(dev_to_bdev(dev), BD_FLAG_MAKE_IT_FAIL); + else + bdev_set_flag(dev_to_bdev(dev), BD_FLAG_MAKE_IT_FAIL); + + } return count; } diff --git a/block/ioctl.c b/block/ioctl.c index 4160f4e6bd5b..a64440f4c96b 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -394,7 +394,11 @@ static int blkdev_roset(struct block_device *bdev, unsigned cmd, if (ret) return ret; } - bdev->bd_read_only = n; + + if (!n) + bdev_clear_flag(bdev, BD_FLAG_READ_ONLY); + else + bdev_set_flag(bdev, BD_FLAG_READ_ONLY); return 0; } diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 52e264d5a830..f7a7965eeb25 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -37,6 +37,11 @@ struct bio_crypt_ctx; #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) #define SECTOR_MASK (PAGE_SECTORS - 1) +#define BD_FLAG_READ_ONLY 0 /* read-only-policy */ +#define BD_FLAG_WRITE_HOLDER 1 +#define BD_FLAG_HAS_SUBMIT_BIO 2 +#define BD_FLAG_MAKE_IT_FAIL 3 + struct block_device { sector_t bd_start_sect; sector_t bd_nr_sectors; @@ -44,10 +49,8 @@ struct block_device { struct request_queue * bd_queue; struct disk_stats __percpu *bd_stats; unsigned long bd_stamp; - bool bd_read_only; /* read-only policy */ + unsigned int bd_flags; u8 bd_partno; - bool bd_write_holder; - bool bd_has_submit_bio; dev_t bd_dev; atomic_t bd_openers; spinlock_t bd_size_lock; /* for bd_inode->i_size updates */ @@ -63,9 +66,6 @@ struct block_device { struct mutex bd_fsfreeze_mutex; /* serialize freeze/thaw */ struct partition_meta_info *bd_meta_info; -#ifdef CONFIG_FAIL_MAKE_REQUEST - bool bd_make_it_fail; -#endif int bd_writers; /* * keep this out-of-line as it's both big and not needed in the fast @@ -83,6 +83,21 @@ struct block_device { #define bdev_kobj(_bdev) \ (&((_bdev)->bd_device.kobj)) +static inline bool bdev_flagged(struct block_device *bdev, unsigned int bit) +{ + return bdev->bd_flags & (1U << bit); +} + +static inline void bdev_set_flag(struct block_device *bdev, unsigned int bit) +{ + bdev->bd_flags |= (1U << bit); +} + +static inline void bdev_clear_flag(struct block_device *bdev, unsigned int bit) +{ + bdev->bd_flags &= ~(1U << bit); +} + /* * Block error status values. See block/blk-core:blk_errors for the details. * Alpha cannot write a byte atomically, so we need to use 32-bit value. diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 9f6c3373f9fc..be1a39c0f8db 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -743,13 +743,14 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action); static inline int get_disk_ro(struct gendisk *disk) { - return disk->part0->bd_read_only || + return bdev_flagged(disk->part0, BD_FLAG_READ_ONLY) || test_bit(GD_READ_ONLY, &disk->state); } static inline int bdev_read_only(struct block_device *bdev) { - return bdev->bd_read_only || get_disk_ro(bdev->bd_disk); + return bdev_flagged(bdev, BD_FLAG_READ_ONLY) || + get_disk_ro(bdev->bd_disk); } bool set_capacity_and_notify(struct gendisk *disk, sector_t size);