diff mbox series

[16/20] block: stop using bdget_disk for partition 0

Message ID 20201118084800.2339180-17-hch@lst.de (mailing list archive)
State Superseded
Headers show
Series [01/20] blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats | expand

Commit Message

Christoph Hellwig Nov. 18, 2020, 8:47 a.m. UTC 
We can just dereference the point in struct gendisk instead.  Also
remove the now unused export.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/genhd.c                   |  1 -
 drivers/block/nbd.c             |  4 +---
 drivers/block/xen-blkfront.c    | 20 +++++---------------
 drivers/block/zram/zram_drv.c   | 18 +++---------------
 drivers/md/dm.c                 |  8 +-------
 drivers/s390/block/dasd_ioctl.c |  5 ++---
 6 files changed, 12 insertions(+), 44 deletions(-)

Comments

Jan Kara Nov. 19, 2020, 2:43 p.m. UTC | #1 
On Wed 18-11-20 09:47:56, 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   | 18 +++---------------
>  drivers/md/dm.c                 |  8 +-------
>  drivers/s390/block/dasd_ioctl.c |  5 ++---
>  6 files changed, 12 insertions(+), 44 deletions(-)
> 
> diff --git a/block/genhd.c b/block/genhd.c
> index a14e2408e3d4e8..ec41d0f18f5ce1 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -907,7 +907,6 @@ 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 01757f9578dcb8..56024905bd242c 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -1748,7 +1748,7 @@ static ssize_t reset_store(struct device *dev,
>  		struct device_attribute *attr, const char *buf, size_t len)
>  {
>  	struct zram *zram = dev_to_zram(dev);
> -	struct block_device *bdev;
> +	struct block_device *bdev = zram->disk->part0;
>  	unsigned short do_reset;
>  	int ret = 0;
>  
> @@ -1758,17 +1758,12 @@ static ssize_t reset_store(struct device *dev,
>  	if (!do_reset)
>  		return -EINVAL;
>  
> -	bdev = bdget_disk(zram->disk, 0);
> -	if (!bdev)
> -		return -ENOMEM;
> -
>  	mutex_lock(&bdev->bd_mutex);
>  	if (bdev->bd_openers)
>  		ret = -EBUSY;
>  	else
>  		zram_reset_device(zram);
>  	mutex_unlock(&bdev->bd_mutex);
> -	bdput(bdev);
>  
>  	return ret ? ret : len;
>  }
> @@ -1933,15 +1928,8 @@ static int zram_add(void)
>  
>  static int zram_remove(struct zram *zram)
>  {
> -	struct block_device *bdev = bdget_disk(zram->disk, 0);
> -
> -	if (bdev) {
> -		if (bdev->bd_openers) {
> -			bdput(bdev);
> -			return -EBUSY;
> -		}
> -		bdput(bdev);
> -	}
> +	if (zram->disk->part0->bd_openers)
> +		return -EBUSY;
>  
>  	del_gendisk(zram->disk);
>  	zram_debugfs_unregister(zram);
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index c9438feefe55a3..ec48ccae50dd53 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -2375,17 +2375,12 @@ 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(md->frozen_sb);
>  
> -	bdev = bdget_disk(md->disk, 0);
> -	if (!bdev)
> -		return -ENOMEM;
> -	md->frozen_sb = freeze_bdev(bdev);
> +	md->frozen_sb = freeze_bdev(md->disk->part0);
>  	if (IS_ERR(md->frozen_sb)) {
> -		bdput(bdev);
>  		r = PTR_ERR(md->frozen_sb);
>  		md->frozen_sb = NULL;
>  		return r;
> @@ -2402,7 +2397,6 @@ static void unlock_fs(struct mapped_device *md)
>  		return;
>  
>  	thaw_bdev(md->frozen_sb->s_bdev, md->frozen_sb);
> -	bdput(md->frozen_sb->s_bdev);
>  	md->frozen_sb = NULL;
>  	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);
> -- 
> 2.29.2
>
diff mbox series

Patch

diff --git a/block/genhd.c b/block/genhd.c
index a14e2408e3d4e8..ec41d0f18f5ce1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -907,7 +907,6 @@  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 01757f9578dcb8..56024905bd242c 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1748,7 +1748,7 @@  static ssize_t reset_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t len)
 {
 	struct zram *zram = dev_to_zram(dev);
-	struct block_device *bdev;
+	struct block_device *bdev = zram->disk->part0;
 	unsigned short do_reset;
 	int ret = 0;
 
@@ -1758,17 +1758,12 @@  static ssize_t reset_store(struct device *dev,
 	if (!do_reset)
 		return -EINVAL;
 
-	bdev = bdget_disk(zram->disk, 0);
-	if (!bdev)
-		return -ENOMEM;
-
 	mutex_lock(&bdev->bd_mutex);
 	if (bdev->bd_openers)
 		ret = -EBUSY;
 	else
 		zram_reset_device(zram);
 	mutex_unlock(&bdev->bd_mutex);
-	bdput(bdev);
 
 	return ret ? ret : len;
 }
@@ -1933,15 +1928,8 @@  static int zram_add(void)
 
 static int zram_remove(struct zram *zram)
 {
-	struct block_device *bdev = bdget_disk(zram->disk, 0);
-
-	if (bdev) {
-		if (bdev->bd_openers) {
-			bdput(bdev);
-			return -EBUSY;
-		}
-		bdput(bdev);
-	}
+	if (zram->disk->part0->bd_openers)
+		return -EBUSY;
 
 	del_gendisk(zram->disk);
 	zram_debugfs_unregister(zram);
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index c9438feefe55a3..ec48ccae50dd53 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2375,17 +2375,12 @@  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(md->frozen_sb);
 
-	bdev = bdget_disk(md->disk, 0);
-	if (!bdev)
-		return -ENOMEM;
-	md->frozen_sb = freeze_bdev(bdev);
+	md->frozen_sb = freeze_bdev(md->disk->part0);
 	if (IS_ERR(md->frozen_sb)) {
-		bdput(bdev);
 		r = PTR_ERR(md->frozen_sb);
 		md->frozen_sb = NULL;
 		return r;
@@ -2402,7 +2397,6 @@  static void unlock_fs(struct mapped_device *md)
 		return;
 
 	thaw_bdev(md->frozen_sb->s_bdev, md->frozen_sb);
-	bdput(md->frozen_sb->s_bdev);
 	md->frozen_sb = NULL;
 	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);