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block: clarify context for refcount increment helpers

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Let us clarify the context under which the helpers to increment the
refcount for the gendisk and request_queue can be called under. We
make this explicit on the places where we may sleep with might_sleep().

We don't address the decrement context yet, as that needs some extra
work and fixes, but will be addressed in the next patch.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Luis Chamberlain 2020-06-19 20:47:24 +00:00 committed by Jens Axboe
parent b5bd357cf8
commit 763b58923a
2 changed files with 8 additions and 0 deletions
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2
block/blk-core.c
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@ -610,6 +610,8 @@ EXPORT_SYMBOL(blk_alloc_queue);
* @q: the request_queue structure to increment the refcount for
*
* Increment the refcount of the request_queue kobject.
*
* Context: Any context.
*/
bool blk_get_queue(struct request_queue *q)
{

6
block/genhd.c
View File

@ -985,11 +985,15 @@ static ssize_t disk_badblocks_store(struct device *dev,
*
* This function gets the structure containing partitioning
* information for the given device @devt.
*
* Context: can sleep
*/
struct gendisk *get_gendisk(dev_t devt, int *partno)
{
struct gendisk *disk = NULL;
might_sleep();
if (MAJOR(devt) != BLOCK_EXT_MAJOR) {
struct kobject *kobj;
@ -1764,6 +1768,8 @@ EXPORT_SYMBOL(__alloc_disk_node);
*
* This increments the refcount for the struct gendisk, and the gendisk's
* fops module owner.
*
* Context: Any context.
*/
struct kobject *get_disk_and_module(struct gendisk *disk)
{