From b3926f1a34c6aa2b456e2e357e533cb4470d0ec6 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Wed, 15 Mar 2023 11:39:03 -0700 Subject: [PATCH] BACKPORT: FROMGIT: blk-crypto: make blk_crypto_evict_key() return void blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So there is nothing the caller can do with errors except log them. (dm-table.c does "use" the error code, but only to pass on to upper layers, so it doesn't really count.) Just make blk_crypto_evict_key() return void and log errors itself. Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20230315183907.53675-2-ebiggers@kernel.org Signed-off-by: Jens Axboe Bug: 270098322 (cherry picked from commit 70493a63ba04f754f7a7dd53a4fcc82700181490 https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/log/?h=for-next) Change-Id: I8b9c7a74473e21fb740f021ac9f2fff95f986aa4 Signed-off-by: Eric Biggers --- block/blk-crypto.c | 22 ++++++++++------------ drivers/md/dm-table.c | 19 +++++-------------- include/linux/blk-crypto.h | 4 ++-- 3 files changed, 17 insertions(+), 28 deletions(-) diff --git a/block/blk-crypto.c b/block/blk-crypto.c index 84abf970c40c..26956813a7bf 100644 --- a/block/blk-crypto.c +++ b/block/blk-crypto.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include "blk-crypto-internal.h" @@ -418,20 +419,17 @@ EXPORT_SYMBOL_GPL(blk_crypto_start_using_key); * Upper layers (filesystems) must call this function to ensure that a key is * evicted from any hardware that it might have been programmed into. The key * must not be in use by any in-flight IO when this function is called. - * - * Return: 0 on success or if key is not present in the q's ksm, -err on error. */ -int blk_crypto_evict_key(struct request_queue *q, - const struct blk_crypto_key *key) +void blk_crypto_evict_key(struct request_queue *q, + const struct blk_crypto_key *key) { - if (blk_ksm_crypto_cfg_supported(q->ksm, &key->crypto_cfg)) - return blk_ksm_evict_key(q->ksm, key); + int err; - /* - * If the request queue's associated inline encryption hardware didn't - * have support for the key, then the key might have been programmed - * into the fallback keyslot manager, so try to evict from there. - */ - return blk_crypto_fallback_evict_key(key); + if (blk_ksm_crypto_cfg_supported(q->ksm, &key->crypto_cfg)) + err = blk_ksm_evict_key(q->ksm, key); + else + err = blk_crypto_fallback_evict_key(key); + if (err) + pr_warn_ratelimited("error %d evicting key\n", err); } EXPORT_SYMBOL_GPL(blk_crypto_evict_key); diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index ade798f92817..743bdb157b3e 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1221,21 +1221,12 @@ struct dm_keyslot_manager { struct mapped_device *md; }; -struct dm_keyslot_evict_args { - const struct blk_crypto_key *key; - int err; -}; - static int dm_keyslot_evict_callback(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { - struct dm_keyslot_evict_args *args = data; - int err; + const struct blk_crypto_key *key = data; - err = blk_crypto_evict_key(bdev_get_queue(dev->bdev), args->key); - if (!args->err) - args->err = err; - /* Always try to evict the key from all devices. */ + blk_crypto_evict_key(bdev_get_queue(dev->bdev), key); return 0; } @@ -1250,7 +1241,6 @@ static int dm_keyslot_evict(struct blk_keyslot_manager *ksm, struct dm_keyslot_manager, ksm); struct mapped_device *md = dksm->md; - struct dm_keyslot_evict_args args = { key }; struct dm_table *t; int srcu_idx; int i; @@ -1263,10 +1253,11 @@ static int dm_keyslot_evict(struct blk_keyslot_manager *ksm, ti = dm_table_get_target(t, i); if (!ti->type->iterate_devices) continue; - ti->type->iterate_devices(ti, dm_keyslot_evict_callback, &args); + ti->type->iterate_devices(ti, dm_keyslot_evict_callback, + (void *)key); } dm_put_live_table(md, srcu_idx); - return args.err; + return 0; } struct dm_derive_raw_secret_args { diff --git a/include/linux/blk-crypto.h b/include/linux/blk-crypto.h index c495572a3c46..d89f521d8310 100644 --- a/include/linux/blk-crypto.h +++ b/include/linux/blk-crypto.h @@ -104,8 +104,8 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key, int blk_crypto_start_using_key(const struct blk_crypto_key *key, struct request_queue *q); -int blk_crypto_evict_key(struct request_queue *q, - const struct blk_crypto_key *key); +void blk_crypto_evict_key(struct request_queue *q, + const struct blk_crypto_key *key); bool blk_crypto_config_supported(struct request_queue *q, const struct blk_crypto_config *cfg);