Re: [PATCH V4 10/12] block: call __bio_free in bio_endio

On Wed, Jun 28, 2017 at 02:42:49PM -0700, Shaohua Li wrote:

quoted

quoted

bio_integrity_endio -> bio_integrity_verify_fn -> bio_integrity_process
access the integrity data, so I don't think this works as-is.

oh, I probably missed the integrity endio. could we let bio_integrity_verify_fn
free integrity info and and bio_endio free cgroup info?

something like this (will need the cgroup fixes from you still) should
do the trick, although it's completely untested:

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index b8a3a65f7364..b66eb92b5a00 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c

@@ -102,7 +102,7 @@ EXPORT_SYMBOL(bio_integrity_alloc);
  * Description: Used to free the integrity portion of a bio. Usually
  * called from bio_free().
  */
-void bio_integrity_free(struct bio *bio)
+static void bio_integrity_free(struct bio *bio)
 {
 	struct bio_integrity_payload *bip = bio_integrity(bio);
 	struct bio_set *bs = bio->bi_pool;

@@ -120,8 +120,8 @@ void bio_integrity_free(struct bio *bio)
 	}
 
 	bio->bi_integrity = NULL;
+	bio->bi_opf &= ~REQ_INTEGRITY;
 }
-EXPORT_SYMBOL(bio_integrity_free);
 
 /**
  * bio_integrity_add_page - Attach integrity metadata

@@ -340,12 +340,6 @@ int bio_integrity_prep(struct bio *bio)
 		offset = 0;
 	}
 
-	/* Install custom I/O completion handler if read verify is enabled */
-	if (bio_data_dir(bio) == READ) {
-		bip->bip_end_io = bio->bi_end_io;
-		bio->bi_end_io = bio_integrity_endio;
-	}
-
 	/* Auto-generate integrity metadata if this is a write */
 	if (bio_data_dir(bio) == WRITE)
 		bio_integrity_process(bio, bi->profile->generate_fn);

@@ -370,14 +364,12 @@ static void bio_integrity_verify_fn(struct work_struct *work)
 	struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
 
 	bio->bi_status = bio_integrity_process(bio, bi->profile->verify_fn);
-
-	/* Restore original bio completion handler */
-	bio->bi_end_io = bip->bip_end_io;
+	bio_integrity_free(bio);
 	bio_endio(bio);