Currently __bio_integrity_endio frees the integrity payload unless it is
explicitly marked as user-mapped. This means in-kernel callers that
allocate their own integrity payload never get to see it on I/O
completion. The current two users don't need it as they just pre-mapped
PI tuples received over the network, but this limits uses of integrity
data lot.
Change bio_integrity_endio to call __bio_integrity_endio for block layer
generated integrity data only, and leave freeing of submitter
allocated integrity data to bio_uninit which also gets called from
the final bio_put. This requires that unmapping user mapped or copied
integrity data is now always done by the caller, and the special
BIP_INTEGRITY_USER flag can go away.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/bio-integrity.c | 57 ++++++++++++++---------------------
block/blk.h | 13 ++++++--
include/linux/bio-integrity.h | 3 +-
3 files changed, 34 insertions(+), 39 deletions(-)
diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index c8757d47e0ef62..4aa836d603fb23 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -22,9 +22,17 @@ void blk_flush_integrity(void)
flush_workqueue(kintegrityd_wq);
}
-static void __bio_integrity_free(struct bio_set *bs,
- struct bio_integrity_payload *bip)
+/**
+ * bio_integrity_free - Free bio integrity payload
+ * @bio: bio containing bip to be freed
+ *
+ * Description: Free the integrity portion of a bio.
+ */
+void bio_integrity_free(struct bio *bio)
{
+ struct bio_integrity_payload *bip = bio_integrity(bio);
+ struct bio_set *bs = bio->bi_pool;
+
if (bs && mempool_initialized(&bs->bio_integrity_pool)) {
if (bip->bip_vec)
bvec_free(&bs->bvec_integrity_pool, bip->bip_vec,
@@ -33,6 +41,8 @@ static void __bio_integrity_free(struct bio_set *bs,
} else {
kfree(bip);
}
+ bio->bi_integrity = NULL;
+ bio->bi_opf &= ~REQ_INTEGRITY;
}
/**
@@ -86,7 +96,10 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
return bip;
err:
- __bio_integrity_free(bs, bip);
+ if (bs && mempool_initialized(&bs->bio_integrity_pool))
+ mempool_free(bip, &bs->bio_integrity_pool);
+ else
+ kfree(bip);
return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(bio_integrity_alloc);
@@ -132,28 +145,6 @@ static void bio_integrity_unmap_user(struct bio_integrity_payload *bip)
bio_integrity_unpin_bvec(bip->bip_vec, bip->bip_max_vcnt, dirty);
}
-/**
- * bio_integrity_free - Free bio integrity payload
- * @bio: bio containing bip to be freed
- *
- * Description: Used to free the integrity portion of a bio. Usually
- * called from bio_free().
- */
-void bio_integrity_free(struct bio *bio)
-{
- struct bio_integrity_payload *bip = bio_integrity(bio);
- struct bio_set *bs = bio->bi_pool;
-
- if (bip->bip_flags & BIP_INTEGRITY_USER)
- return;
- if (bip->bip_flags & BIP_BLOCK_INTEGRITY)
- kfree(bvec_virt(bip->bip_vec));
-
- __bio_integrity_free(bs, bip);
- bio->bi_integrity = NULL;
- bio->bi_opf &= ~REQ_INTEGRITY;
-}
-
/**
* bio_integrity_unmap_free_user - Unmap and free bio user integrity payload
* @bio: bio containing bip to be unmapped and freed
@@ -165,14 +156,9 @@ void bio_integrity_free(struct bio *bio)
void bio_integrity_unmap_free_user(struct bio *bio)
{
struct bio_integrity_payload *bip = bio_integrity(bio);
- struct bio_set *bs = bio->bi_pool;
- if (WARN_ON_ONCE(!(bip->bip_flags & BIP_INTEGRITY_USER)))
- return;
bio_integrity_unmap_user(bip);
- __bio_integrity_free(bs, bip);
- bio->bi_integrity = NULL;
- bio->bi_opf &= ~REQ_INTEGRITY;
+ bio_integrity_free(bio);
}
/**
@@ -273,7 +259,7 @@ static int bio_integrity_copy_user(struct bio *bio, struct bio_vec *bvec,
goto free_bip;
}
- bip->bip_flags |= BIP_INTEGRITY_USER | BIP_COPY_USER;
+ bip->bip_flags |= BIP_COPY_USER;
bip->bip_iter.bi_sector = seed;
bip->bip_vcnt = nr_vecs;
return 0;
@@ -294,7 +280,6 @@ static int bio_integrity_init_user(struct bio *bio, struct bio_vec *bvec,
return PTR_ERR(bip);
memcpy(bip->bip_vec, bvec, nr_vecs * sizeof(*bvec));
- bip->bip_flags |= BIP_INTEGRITY_USER;
bip->bip_iter.bi_sector = seed;
bip->bip_iter.bi_size = len;
bip->bip_vcnt = nr_vecs;
@@ -502,6 +487,8 @@ static void bio_integrity_verify_fn(struct work_struct *work)
struct bio *bio = bip->bip_bio;
blk_integrity_verify(bio);
+
+ kfree(bvec_virt(bip->bip_vec));
bio_integrity_free(bio);
bio_endio(bio);
}
@@ -522,13 +509,13 @@ bool __bio_integrity_endio(struct bio *bio)
struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
struct bio_integrity_payload *bip = bio_integrity(bio);
- if (bio_op(bio) == REQ_OP_READ && !bio->bi_status &&
- (bip->bip_flags & BIP_BLOCK_INTEGRITY) && bi->csum_type) {
+ if (bio_op(bio) == REQ_OP_READ && !bio->bi_status && bi->csum_type) {
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
queue_work(kintegrityd_wq, &bip->bip_work);
return false;
}
+ kfree(bvec_virt(bip->bip_vec));
bio_integrity_free(bio);
return true;
}
diff --git a/block/blk.h b/block/blk.h
index 401e604f35d2cf..2233dc8d36b82a 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -202,11 +202,20 @@ static inline unsigned int blk_queue_get_max_sectors(struct request *rq)
#ifdef CONFIG_BLK_DEV_INTEGRITY
void blk_flush_integrity(void);
-bool __bio_integrity_endio(struct bio *);
void bio_integrity_free(struct bio *bio);
+
+/*
+ * Integrity payloads can either be owned by the submitter, in which case
+ * bio_uninit will free them, or owned and generated by the block layer,
+ * in which case we'll verify them here (for reads) and free them before
+ * the bio is handed back to the submitted.
+ */
+bool __bio_integrity_endio(struct bio *bio);
static inline bool bio_integrity_endio(struct bio *bio)
{
- if (bio_integrity(bio))
+ struct bio_integrity_payload *bip = bio_integrity(bio);
+
+ if (bip && (bip->bip_flags & BIP_BLOCK_INTEGRITY))
return __bio_integrity_endio(bio);
return true;
}
diff --git a/include/linux/bio-integrity.h b/include/linux/bio-integrity.h
index cac24dac06fff0..3823d9be0d0790 100644
--- a/include/linux/bio-integrity.h
+++ b/include/linux/bio-integrity.h
@@ -10,8 +10,7 @@ enum bip_flags {
BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */
BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */
BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */
- BIP_INTEGRITY_USER = 1 << 5, /* Integrity payload is user address */
- BIP_COPY_USER = 1 << 6, /* Kernel bounce buffer in use */
+ BIP_COPY_USER = 1 << 5, /* Kernel bounce buffer in use */
};
struct bio_integrity_payload {
--
2.43.0
