[PATCH v6 2/6] block: clarify context for refcount increment helpers
From: Luis Chamberlain <mcgrof@kernel.org>
Date: 2020-06-08 17:02:23
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
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. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> --- block/blk-core.c | 2 ++ block/genhd.c | 6 ++++++ 2 files changed, 8 insertions(+)
diff --git a/block/blk-core.c b/block/blk-core.c
index a0760aac110a..14c09daf55f3 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c@@ -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) {
diff --git a/block/genhd.c b/block/genhd.c
index f741613d731f..1be86b1f43ec 100644
--- a/block/genhd.c
+++ b/block/genhd.c@@ -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) {
--
2.26.2