Ensure all bios check the current values of the queue under freeze
protection, i.e. to make sure the zero capacity set by del_gendisk
is actually seen before dispatching to the driver.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/blk-core.c | 34 ++++++++++++----------------------
1 file changed, 12 insertions(+), 22 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 5454db2fa263b..c071f1a90b104 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -899,11 +899,18 @@ static blk_qc_t __submit_bio(struct bio *bio)
struct gendisk *disk = bio->bi_bdev->bd_disk;
blk_qc_t ret = BLK_QC_T_NONE;
- if (blk_crypto_bio_prep(&bio)) {
- if (!disk->fops->submit_bio)
- return blk_mq_submit_bio(bio);
+ if (unlikely(bio_queue_enter(bio) != 0))
+ return BLK_QC_T_NONE;
+
+ if (!submit_bio_checks(bio) || !blk_crypto_bio_prep(&bio))
+ goto queue_exit;
+ if (disk->fops->submit_bio) {
ret = disk->fops->submit_bio(bio);
+ goto queue_exit;
}
+ return blk_mq_submit_bio(bio);
+
+queue_exit:
blk_queue_exit(disk->queue);
return ret;
}
@@ -941,9 +948,6 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio)
struct request_queue *q = bio->bi_bdev->bd_disk->queue;
struct bio_list lower, same;
- if (unlikely(bio_queue_enter(bio) != 0))
- continue;
-
/*
* Create a fresh bio_list for all subordinate requests.
*/
@@ -979,23 +983,12 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio)
static blk_qc_t __submit_bio_noacct_mq(struct bio *bio)
{
struct bio_list bio_list[2] = { };
- blk_qc_t ret = BLK_QC_T_NONE;
+ blk_qc_t ret;
current->bio_list = bio_list;
do {
- struct gendisk *disk = bio->bi_bdev->bd_disk;
-
- if (unlikely(bio_queue_enter(bio) != 0))
- continue;
-
- if (!blk_crypto_bio_prep(&bio)) {
- blk_queue_exit(disk->queue);
- ret = BLK_QC_T_NONE;
- continue;
- }
-
- ret = blk_mq_submit_bio(bio);
+ ret = __submit_bio(bio);
} while ((bio = bio_list_pop(&bio_list[0])));
current->bio_list = NULL;
@@ -1013,9 +1006,6 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio)
*/
blk_qc_t submit_bio_noacct(struct bio *bio)
{
- if (!submit_bio_checks(bio))
- return BLK_QC_T_NONE;
-
/*
* We only want one ->submit_bio to be active at a time, else stack
* usage with stacked devices could be a problem. Use current->bio_list
--
2.30.2
