From: Jan Kara <jack@suse.cz>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
Josef Bacik <josef@toxicpanda.com>, Coly Li <colyli@suse.de>,
Mike Snitzer <snitzer@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jan Kara <jack@suse.cz>,
Johannes Thumshirn <johannes.thumshirn@wdc.com>,
dm-devel@redhat.com, Jan Kara <jack@suse.com>,
linux-block@vger.kernel.org, linux-bcache@vger.kernel.org,
linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 44/44] block: stop using bdget_disk for partition 0
Date: Fri, 27 Nov 2020 14:22:21 +0100 [thread overview]
Message-ID: <20201127132221.GF27162@quack2.suse.cz> (raw)
In-Reply-To: <20201126130422.92945-45-hch@lst.de>
On Thu 26-11-20 14:04:22, Christoph Hellwig wrote:
> We can just dereference the point in struct gendisk instead. Also
> remove the now unused export.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
Looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> block/genhd.c | 1 -
> drivers/block/nbd.c | 4 +---
> drivers/block/xen-blkfront.c | 20 +++++---------------
> drivers/block/zram/zram_drv.c | 14 ++------------
> drivers/md/dm.c | 16 ++--------------
> drivers/s390/block/dasd_ioctl.c | 5 ++---
> fs/block_dev.c | 2 +-
> 7 files changed, 13 insertions(+), 49 deletions(-)
>
> diff --git a/block/genhd.c b/block/genhd.c
> index af76c2fff40d31..01876a162f5813 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -920,7 +920,6 @@ struct block_device *bdget_disk(struct gendisk *disk, int partno)
>
> return bdev;
> }
> -EXPORT_SYMBOL(bdget_disk);
>
> /*
> * print a full list of all partitions - intended for places where the root
> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> index 014683968ce174..92f84ed0ba9eb6 100644
> --- a/drivers/block/nbd.c
> +++ b/drivers/block/nbd.c
> @@ -1488,12 +1488,10 @@ static int nbd_open(struct block_device *bdev, fmode_t mode)
> static void nbd_release(struct gendisk *disk, fmode_t mode)
> {
> struct nbd_device *nbd = disk->private_data;
> - struct block_device *bdev = bdget_disk(disk, 0);
>
> if (test_bit(NBD_RT_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) &&
> - bdev->bd_openers == 0)
> + disk->part0->bd_openers == 0)
> nbd_disconnect_and_put(nbd);
> - bdput(bdev);
>
> nbd_config_put(nbd);
> nbd_put(nbd);
> diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
> index 79521e33d30ed5..188e0b47534bcf 100644
> --- a/drivers/block/xen-blkfront.c
> +++ b/drivers/block/xen-blkfront.c
> @@ -2153,7 +2153,7 @@ static void blkfront_closing(struct blkfront_info *info)
> }
>
> if (info->gd)
> - bdev = bdget_disk(info->gd, 0);
> + bdev = bdgrab(info->gd->part0);
>
> mutex_unlock(&info->mutex);
>
> @@ -2518,7 +2518,7 @@ static int blkfront_remove(struct xenbus_device *xbdev)
>
> disk = info->gd;
> if (disk)
> - bdev = bdget_disk(disk, 0);
> + bdev = bdgrab(disk->part0);
>
> info->xbdev = NULL;
> mutex_unlock(&info->mutex);
> @@ -2595,19 +2595,11 @@ static int blkif_open(struct block_device *bdev, fmode_t mode)
> static void blkif_release(struct gendisk *disk, fmode_t mode)
> {
> struct blkfront_info *info = disk->private_data;
> - struct block_device *bdev;
> struct xenbus_device *xbdev;
>
> mutex_lock(&blkfront_mutex);
> -
> - bdev = bdget_disk(disk, 0);
> -
> - if (!bdev) {
> - WARN(1, "Block device %s yanked out from us!\n", disk->disk_name);
> + if (disk->part0->bd_openers)
> goto out_mutex;
> - }
> - if (bdev->bd_openers)
> - goto out;
>
> /*
> * Check if we have been instructed to close. We will have
> @@ -2619,7 +2611,7 @@ static void blkif_release(struct gendisk *disk, fmode_t mode)
>
> if (xbdev && xbdev->state == XenbusStateClosing) {
> /* pending switch to state closed */
> - dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
> + dev_info(disk_to_dev(disk), "releasing disk\n");
> xlvbd_release_gendisk(info);
> xenbus_frontend_closed(info->xbdev);
> }
> @@ -2628,14 +2620,12 @@ static void blkif_release(struct gendisk *disk, fmode_t mode)
>
> if (!xbdev) {
> /* sudden device removal */
> - dev_info(disk_to_dev(bdev->bd_disk), "releasing disk\n");
> + dev_info(disk_to_dev(disk), "releasing disk\n");
> xlvbd_release_gendisk(info);
> disk->private_data = NULL;
> free_info(info);
> }
>
> -out:
> - bdput(bdev);
> out_mutex:
> mutex_unlock(&blkfront_mutex);
> }
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index dc8957d173d37c..b0701bae6e9800 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -1760,15 +1760,12 @@ static ssize_t reset_store(struct device *dev,
> return -EINVAL;
>
> zram = dev_to_zram(dev);
> - bdev = bdget_disk(zram->disk, 0);
> - if (!bdev)
> - return -ENOMEM;
> + bdev = zram->disk->part0;
>
> mutex_lock(&bdev->bd_mutex);
> /* Do not reset an active device or claimed device */
> if (bdev->bd_openers || zram->claim) {
> mutex_unlock(&bdev->bd_mutex);
> - bdput(bdev);
> return -EBUSY;
> }
>
> @@ -1779,7 +1776,6 @@ static ssize_t reset_store(struct device *dev,
> /* Make sure all the pending I/O are finished */
> fsync_bdev(bdev);
> zram_reset_device(zram);
> - bdput(bdev);
>
> mutex_lock(&bdev->bd_mutex);
> zram->claim = false;
> @@ -1965,16 +1961,11 @@ static int zram_add(void)
>
> static int zram_remove(struct zram *zram)
> {
> - struct block_device *bdev;
> -
> - bdev = bdget_disk(zram->disk, 0);
> - if (!bdev)
> - return -ENOMEM;
> + struct block_device *bdev = zram->disk->part0;
>
> mutex_lock(&bdev->bd_mutex);
> if (bdev->bd_openers || zram->claim) {
> mutex_unlock(&bdev->bd_mutex);
> - bdput(bdev);
> return -EBUSY;
> }
>
> @@ -1986,7 +1977,6 @@ static int zram_remove(struct zram *zram)
> /* Make sure all the pending I/O are finished */
> fsync_bdev(bdev);
> zram_reset_device(zram);
> - bdput(bdev);
>
> pr_info("Removed device: %s\n", zram->disk->disk_name);
>
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 176adcff56b380..ed7e836efbcdbc 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -2375,16 +2375,11 @@ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
> */
> static int lock_fs(struct mapped_device *md)
> {
> - struct block_device *bdev;
> int r;
>
> WARN_ON(test_bit(DMF_FROZEN, &md->flags));
>
> - bdev = bdget_disk(md->disk, 0);
> - if (!bdev)
> - return -ENOMEM;
> - r = freeze_bdev(bdev);
> - bdput(bdev);
> + r = freeze_bdev(md->disk->part0);
> if (!r)
> set_bit(DMF_FROZEN, &md->flags);
> return r;
> @@ -2392,16 +2387,9 @@ static int lock_fs(struct mapped_device *md)
>
> static void unlock_fs(struct mapped_device *md)
> {
> - struct block_device *bdev;
> -
> if (!test_bit(DMF_FROZEN, &md->flags))
> return;
> -
> - bdev = bdget_disk(md->disk, 0);
> - if (!bdev)
> - return;
> - thaw_bdev(bdev);
> - bdput(bdev);
> + thaw_bdev(md->disk->part0);
> clear_bit(DMF_FROZEN, &md->flags);
> }
>
> diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
> index 304eba1acf163c..9f642440894655 100644
> --- a/drivers/s390/block/dasd_ioctl.c
> +++ b/drivers/s390/block/dasd_ioctl.c
> @@ -220,9 +220,8 @@ dasd_format(struct dasd_block *block, struct format_data_t *fdata)
> * enabling the device later.
> */
> if (fdata->start_unit == 0) {
> - struct block_device *bdev = bdget_disk(block->gdp, 0);
> - bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
> - bdput(bdev);
> + block->gdp->part0->bd_inode->i_blkbits =
> + blksize_bits(fdata->blksize);
> }
>
> rc = base->discipline->format_device(base, fdata, 1);
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 58fd6625966511..4edb9f23092285 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -1295,7 +1295,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode)
> if (ret)
> return ret;
> } else {
> - struct block_device *whole = bdget_disk(disk, 0);
> + struct block_device *whole = bdgrab(disk->part0);
>
> mutex_lock_nested(&whole->bd_mutex, 1);
> ret = __blkdev_get(whole, mode);
> --
> 2.29.2
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
prev parent reply other threads:[~2020-11-27 13:22 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 13:03 merge struct block_device and struct hd_struct v3 Christoph Hellwig
2020-11-26 13:03 ` [PATCH 01/44] blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats Christoph Hellwig
2020-11-26 13:03 ` [PATCH 02/44] filemap: consistently use ->f_mapping over ->i_mapping Christoph Hellwig
2020-11-26 13:03 ` [PATCH 03/44] fs: remove get_super_thawed and get_super_exclusive_thawed Christoph Hellwig
2020-11-26 13:03 ` [PATCH 04/44] fs: simplify freeze_bdev/thaw_bdev Christoph Hellwig
2020-11-26 14:13 ` Jan Kara
2020-11-26 13:03 ` [PATCH 05/44] mtip32xx: remove the call to fsync_bdev on removal Christoph Hellwig
2020-11-26 13:03 ` [PATCH 06/44] zram: do not call set_blocksize Christoph Hellwig
2020-11-26 13:03 ` [PATCH 07/44] loop: " Christoph Hellwig
2020-11-26 13:03 ` [PATCH 08/44] dm: simplify flush_bio initialization in __send_empty_flush Christoph Hellwig
2020-11-26 13:03 ` [PATCH 09/44] dm: remove the block_device reference in struct mapped_device Christoph Hellwig
2020-11-27 10:36 ` Hannes Reinecke
2020-11-26 13:03 ` [PATCH 10/44] block: remove a duplicate __disk_get_part prototype Christoph Hellwig
2020-11-27 10:36 ` Hannes Reinecke
2020-11-26 13:03 ` [PATCH 11/44] block: remove a superflous check in blkpg_do_ioctl Christoph Hellwig
2020-11-27 10:37 ` Hannes Reinecke
2020-11-26 13:03 ` [PATCH 12/44] block: add a bdev_kobj helper Christoph Hellwig
2020-11-26 14:47 ` David Sterba
2020-11-27 12:03 ` Hannes Reinecke
2020-11-26 13:03 ` [PATCH 13/44] block: use disk_part_iter_exit in disk_part_iter_next Christoph Hellwig
2020-11-27 12:04 ` Hannes Reinecke
2020-11-26 13:03 ` [PATCH 14/44] block: use put_device in put_disk Christoph Hellwig
2020-11-26 13:03 ` [PATCH 15/44] block: change the hash used for looking up block devices Christoph Hellwig
2020-11-26 13:03 ` [PATCH 16/44] init: refactor name_to_dev_t Christoph Hellwig
2020-11-26 13:03 ` [PATCH 17/44] init: refactor devt_from_partuuid Christoph Hellwig
2020-11-26 13:03 ` [PATCH 18/44] init: cleanup match_dev_by_uuid and match_dev_by_label Christoph Hellwig
2020-11-26 13:03 ` [PATCH 19/44] block: refactor __blkdev_put Christoph Hellwig
2020-11-26 13:03 ` [PATCH 20/44] block: refactor blkdev_get Christoph Hellwig
2020-11-26 14:55 ` Jan Kara
2020-11-26 13:03 ` [PATCH 21/44] block: move bdput() to the callers of __blkdev_get Christoph Hellwig
2020-11-26 15:05 ` Jan Kara
2020-11-26 13:04 ` [PATCH 22/44] block: opencode devcgroup_inode_permission Christoph Hellwig
2020-11-26 15:07 ` Jan Kara
2020-11-26 13:04 ` [PATCH 23/44] block: remove i_bdev Christoph Hellwig
2020-11-26 15:45 ` Jan Kara
2020-11-26 13:04 ` [PATCH 24/44] block: simplify bdev/disk lookup in blkdev_get Christoph Hellwig
2020-11-26 16:33 ` Jan Kara
2020-11-26 17:42 ` Christoph Hellwig
2020-11-26 13:04 ` [PATCH 25/44] block: remove ->bd_contains Christoph Hellwig
2020-11-26 13:04 ` [PATCH 26/44] block: simplify the block device claiming interface Christoph Hellwig
2020-11-26 13:04 ` [PATCH 27/44] block: simplify part_to_disk Christoph Hellwig
2020-11-26 16:36 ` Jan Kara
2020-11-26 13:04 ` [PATCH 28/44] block: initialize struct block_device in bdev_alloc Christoph Hellwig
2020-11-26 16:37 ` Jan Kara
2020-11-26 13:04 ` [PATCH 29/44] block: remove the nr_sects field in struct hd_struct Christoph Hellwig
2020-11-26 16:50 ` Jan Kara
2020-11-26 17:52 ` Christoph Hellwig
2020-11-26 18:04 ` Jan Kara
2020-11-27 9:41 ` Christoph Hellwig
2020-11-26 13:04 ` [PATCH 30/44] block: move disk stat accounting to struct block_device Christoph Hellwig
2020-11-26 16:53 ` Jan Kara
2020-11-26 13:04 ` [PATCH 31/44] block: move the start_sect field " Christoph Hellwig
2020-11-26 16:56 ` Jan Kara
2020-11-26 18:02 ` Christoph Hellwig
2020-11-26 13:04 ` [PATCH 32/44] block: move the partition_meta_info " Christoph Hellwig
2020-11-26 16:58 ` Jan Kara
2020-11-26 13:04 ` [PATCH 33/44] block: move holder_dir " Christoph Hellwig
2020-11-26 17:00 ` Jan Kara
2020-11-26 13:04 ` [PATCH 34/44] block: move make_it_fail " Christoph Hellwig
2020-11-26 17:01 ` Jan Kara
2020-11-26 13:04 ` [PATCH 35/44] block: move the policy field " Christoph Hellwig
2020-11-26 17:03 ` Jan Kara
2020-11-26 13:04 ` [PATCH 36/44] block: allocate struct hd_struct as part of struct bdev_inode Christoph Hellwig
2020-11-26 17:35 ` Jan Kara
2020-11-26 18:00 ` Jan Kara
2020-11-26 18:02 ` Christoph Hellwig
2020-11-26 13:04 ` [PATCH 37/44] block: switch partition lookup to use struct block_device Christoph Hellwig
2020-11-26 17:45 ` Jan Kara
2020-11-26 18:22 ` Jan Kara
2020-11-27 9:48 ` Christoph Hellwig
2020-11-27 12:45 ` Jan Kara
2020-11-27 15:36 ` Christoph Hellwig
2020-11-27 17:26 ` Jan Kara
2020-11-26 13:04 ` [PATCH 38/44] block: remove the partno field from struct hd_struct Christoph Hellwig
2020-11-26 17:46 ` Jan Kara
2020-11-26 13:04 ` [PATCH 39/44] block: pass a block_device to blk_alloc_devt Christoph Hellwig
2020-11-26 17:47 ` Jan Kara
2020-11-26 13:04 ` [PATCH 40/44] block: pass a block_device to invalidate_partition Christoph Hellwig
2020-11-26 17:49 ` Jan Kara
2020-11-26 13:04 ` [PATCH 41/44] block: switch disk_part_iter_* to use a struct block_device Christoph Hellwig
2020-11-27 12:53 ` Jan Kara
2020-11-27 15:24 ` Christoph Hellwig
2020-11-27 17:30 ` Jan Kara
2020-11-26 13:04 ` [PATCH 42/44] f2fs: remove a few bd_part checks Christoph Hellwig
2020-11-26 13:04 ` [PATCH 43/44] block: merge struct block_device and struct hd_struct Christoph Hellwig
2020-11-27 13:19 ` Jan Kara
2020-11-27 15:47 ` Christoph Hellwig
2020-11-26 13:04 ` [PATCH 44/44] block: stop using bdget_disk for partition 0 Christoph Hellwig
2020-11-27 13:22 ` Jan Kara [this message]
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