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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
kernel/trace/blktrace.c
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@@ -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;