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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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9
fs/block_dev.c
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@@ -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;