From 0d02129e76edf91cf04fabf1efbc3a9a1f1d729a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 27 Nov 2020 16:43:51 +0100 Subject: block: merge struct block_device and struct hd_struct Instead of having two structures that represent each block device with different life time rules, merge them into a single one. This also greatly simplifies the reference counting rules, as we can use the inode reference count as the main reference count for the new struct block_device, with the device model reference front ending it for device model interaction. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe --- kernel/trace/blktrace.c | 43 ++++++++----------------------------------- 1 file changed, 8 insertions(+), 35 deletions(-) (limited to 'kernel') diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 8a723a91ec5a..a482a37848bf 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1810,30 +1810,15 @@ static ssize_t blk_trace_mask2str(char *buf, int mask) return p - buf; } -static struct request_queue *blk_trace_get_queue(struct block_device *bdev) -{ - if (bdev->bd_disk == NULL) - return NULL; - - return bdev_get_queue(bdev); -} - static ssize_t sysfs_blk_trace_attr_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct block_device *bdev = bdget_part(dev_to_part(dev)); - struct request_queue *q; + struct block_device *bdev = dev_to_bdev(dev); + struct request_queue *q = bdev_get_queue(bdev); struct blk_trace *bt; ssize_t ret = -ENXIO; - if (bdev == NULL) - goto out; - - q = blk_trace_get_queue(bdev); - if (q == NULL) - goto out_bdput; - mutex_lock(&q->debugfs_mutex); bt = rcu_dereference_protected(q->blk_trace, @@ -1856,9 +1841,6 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev, out_unlock_bdev: mutex_unlock(&q->debugfs_mutex); -out_bdput: - bdput(bdev); -out: return ret; } @@ -1866,8 +1848,8 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct block_device *bdev; - struct request_queue *q; + struct block_device *bdev = dev_to_bdev(dev); + struct request_queue *q = bdev_get_queue(bdev); struct blk_trace *bt; u64 value; ssize_t ret = -EINVAL; @@ -1883,17 +1865,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, goto out; value = ret; } - } else if (kstrtoull(buf, 0, &value)) - goto out; - - ret = -ENXIO; - bdev = bdget_part(dev_to_part(dev)); - if (bdev == NULL) - goto out; - - q = blk_trace_get_queue(bdev); - if (q == NULL) - goto out_bdput; + } else { + if (kstrtoull(buf, 0, &value)) + goto out; + } mutex_lock(&q->debugfs_mutex); @@ -1931,8 +1906,6 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, out_unlock_bdev: mutex_unlock(&q->debugfs_mutex); -out_bdput: - bdput(bdev); out: return ret ? ret : count; } -- cgit v1.2.3