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block: add a bdget_part helper

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All remaining callers of bdget() outside of fs/block_dev.c want to get a
reference to the struct block_device for a given struct hd_struct.  Add
a helper just for that and then mark bdget static.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-09-25 18:06:18 +02:00 committed by Jens Axboe
parent 155bd9d1ab
commit 10ed16662d
5 changed files with 11 additions and 13 deletions
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2
block/genhd.c
View File

@ -1048,7 +1048,7 @@ struct block_device *bdget_disk(struct gendisk *disk, int partno)
part = disk_get_part(disk, partno);
if (part)
bdev = bdget(part_devt(part));
bdev = bdget_part(part);
disk_put_part(part);
return bdev;

2
block/partitions/core.c
View File

@ -580,7 +580,7 @@ int bdev_resize_partition(struct block_device *bdev, int partno,
return -ENXIO;
ret = -ENOMEM;
bdevp = bdget(part_devt(part));
bdevp = bdget_part(part);
if (!bdevp)
goto out_put_part;

9
fs/block_dev.c
View File

@ -891,7 +891,7 @@ static int bdev_set(struct inode *inode, void *data)
return 0;
}
struct block_device *bdget(dev_t dev)
static struct block_device *bdget(dev_t dev)
{
struct block_device *bdev;
struct inode *inode;
@ -920,8 +920,6 @@ struct block_device *bdget(dev_t dev)
return bdev;
}
EXPORT_SYMBOL(bdget);
/**
* bdgrab -- Grab a reference to an already referenced block device
* @bdev: Block device to grab a reference to.
@ -933,6 +931,11 @@ struct block_device *bdgrab(struct block_device *bdev)
}
EXPORT_SYMBOL(bdgrab);
struct block_device *bdget_part(struct hd_struct *part)
{
return bdget(part_devt(part));
}
long nr_blockdev_pages(void)
{
struct inode *inode;

2
include/linux/blkdev.h
View File

@ -2003,7 +2003,7 @@ void bd_abort_claiming(struct block_device *bdev, struct block_device *whole,
void blkdev_put(struct block_device *bdev, fmode_t mode);
struct block_device *I_BDEV(struct inode *inode);
struct block_device *bdget(dev_t);
struct block_device *bdget_part(struct hd_struct *part);
struct block_device *bdgrab(struct block_device *bdev);
void bdput(struct block_device *);

9
kernel/trace/blktrace.c
View File

@ -1827,13 +1827,11 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hd_struct *p = dev_to_part(dev);
struct block_device *bdev = bdget_part(dev_to_part(dev));
struct request_queue *q;
struct block_device *bdev;
struct blk_trace *bt;
ssize_t ret = -ENXIO;
bdev = bdget(part_devt(p));
if (bdev == NULL)
goto out;
@ -1875,7 +1873,6 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
{
struct block_device *bdev;
struct request_queue *q;
struct hd_struct *p;
struct blk_trace *bt;
u64 value;
ssize_t ret = -EINVAL;
@ -1895,9 +1892,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
goto out;
ret = -ENXIO;
p = dev_to_part(dev);
bdev = bdget(part_devt(p));
bdev = bdget_part(dev_to_part(dev));
if (bdev == NULL)
goto out;