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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /block/bio-integrity.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | block/bio-integrity.c | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/block/bio-integrity.c b/block/bio-integrity.c new file mode 100644 index 0000000000..ec8ac8cf6e --- /dev/null +++ b/block/bio-integrity.c @@ -0,0 +1,461 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * bio-integrity.c - bio data integrity extensions + * + * Copyright (C) 2007, 2008, 2009 Oracle Corporation + * Written by: Martin K. Petersen <martin.petersen@oracle.com> + */ + +#include <linux/blk-integrity.h> +#include <linux/mempool.h> +#include <linux/export.h> +#include <linux/bio.h> +#include <linux/workqueue.h> +#include <linux/slab.h> +#include "blk.h" + +static struct kmem_cache *bip_slab; +static struct workqueue_struct *kintegrityd_wq; + +void blk_flush_integrity(void) +{ + flush_workqueue(kintegrityd_wq); +} + +static void __bio_integrity_free(struct bio_set *bs, + struct bio_integrity_payload *bip) +{ + if (bs && mempool_initialized(&bs->bio_integrity_pool)) { + if (bip->bip_vec) + bvec_free(&bs->bvec_integrity_pool, bip->bip_vec, + bip->bip_max_vcnt); + mempool_free(bip, &bs->bio_integrity_pool); + } else { + kfree(bip); + } +} + +/** + * bio_integrity_alloc - Allocate integrity payload and attach it to bio + * @bio: bio to attach integrity metadata to + * @gfp_mask: Memory allocation mask + * @nr_vecs: Number of integrity metadata scatter-gather elements + * + * Description: This function prepares a bio for attaching integrity + * metadata. nr_vecs specifies the maximum number of pages containing + * integrity metadata that can be attached. + */ +struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, + gfp_t gfp_mask, + unsigned int nr_vecs) +{ + struct bio_integrity_payload *bip; + struct bio_set *bs = bio->bi_pool; + unsigned inline_vecs; + + if (WARN_ON_ONCE(bio_has_crypt_ctx(bio))) + return ERR_PTR(-EOPNOTSUPP); + + if (!bs || !mempool_initialized(&bs->bio_integrity_pool)) { + bip = kmalloc(struct_size(bip, bip_inline_vecs, nr_vecs), gfp_mask); + inline_vecs = nr_vecs; + } else { + bip = mempool_alloc(&bs->bio_integrity_pool, gfp_mask); + inline_vecs = BIO_INLINE_VECS; + } + + if (unlikely(!bip)) + return ERR_PTR(-ENOMEM); + + memset(bip, 0, sizeof(*bip)); + + if (nr_vecs > inline_vecs) { + bip->bip_max_vcnt = nr_vecs; + bip->bip_vec = bvec_alloc(&bs->bvec_integrity_pool, + &bip->bip_max_vcnt, gfp_mask); + if (!bip->bip_vec) + goto err; + } else { + bip->bip_vec = bip->bip_inline_vecs; + bip->bip_max_vcnt = inline_vecs; + } + + bip->bip_bio = bio; + bio->bi_integrity = bip; + bio->bi_opf |= REQ_INTEGRITY; + + return bip; +err: + __bio_integrity_free(bs, bip); + return ERR_PTR(-ENOMEM); +} +EXPORT_SYMBOL(bio_integrity_alloc); + +/** + * 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_BLOCK_INTEGRITY) + kfree(bvec_virt(bip->bip_vec)); + + __bio_integrity_free(bs, bip); + bio->bi_integrity = NULL; + bio->bi_opf &= ~REQ_INTEGRITY; +} + +/** + * bio_integrity_add_page - Attach integrity metadata + * @bio: bio to update + * @page: page containing integrity metadata + * @len: number of bytes of integrity metadata in page + * @offset: start offset within page + * + * Description: Attach a page containing integrity metadata to bio. + */ +int bio_integrity_add_page(struct bio *bio, struct page *page, + unsigned int len, unsigned int offset) +{ + struct request_queue *q = bdev_get_queue(bio->bi_bdev); + struct bio_integrity_payload *bip = bio_integrity(bio); + + if (((bip->bip_iter.bi_size + len) >> SECTOR_SHIFT) > + queue_max_hw_sectors(q)) + return 0; + + if (bip->bip_vcnt > 0) { + struct bio_vec *bv = &bip->bip_vec[bip->bip_vcnt - 1]; + bool same_page = false; + + if (bvec_try_merge_hw_page(q, bv, page, len, offset, + &same_page)) { + bip->bip_iter.bi_size += len; + return len; + } + + if (bip->bip_vcnt >= + min(bip->bip_max_vcnt, queue_max_integrity_segments(q))) + return 0; + + /* + * If the queue doesn't support SG gaps and adding this segment + * would create a gap, disallow it. + */ + if (bvec_gap_to_prev(&q->limits, bv, offset)) + return 0; + } + + bvec_set_page(&bip->bip_vec[bip->bip_vcnt], page, len, offset); + bip->bip_vcnt++; + bip->bip_iter.bi_size += len; + + return len; +} +EXPORT_SYMBOL(bio_integrity_add_page); + +/** + * bio_integrity_process - Process integrity metadata for a bio + * @bio: bio to generate/verify integrity metadata for + * @proc_iter: iterator to process + * @proc_fn: Pointer to the relevant processing function + */ +static blk_status_t bio_integrity_process(struct bio *bio, + struct bvec_iter *proc_iter, integrity_processing_fn *proc_fn) +{ + struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk); + struct blk_integrity_iter iter; + struct bvec_iter bviter; + struct bio_vec bv; + struct bio_integrity_payload *bip = bio_integrity(bio); + blk_status_t ret = BLK_STS_OK; + + iter.disk_name = bio->bi_bdev->bd_disk->disk_name; + iter.interval = 1 << bi->interval_exp; + iter.tuple_size = bi->tuple_size; + iter.seed = proc_iter->bi_sector; + iter.prot_buf = bvec_virt(bip->bip_vec); + + __bio_for_each_segment(bv, bio, bviter, *proc_iter) { + void *kaddr = bvec_kmap_local(&bv); + + iter.data_buf = kaddr; + iter.data_size = bv.bv_len; + ret = proc_fn(&iter); + kunmap_local(kaddr); + + if (ret) + break; + + } + return ret; +} + +/** + * bio_integrity_prep - Prepare bio for integrity I/O + * @bio: bio to prepare + * + * Description: Checks if the bio already has an integrity payload attached. + * If it does, the payload has been generated by another kernel subsystem, + * and we just pass it through. Otherwise allocates integrity payload. + * The bio must have data direction, target device and start sector set priot + * to calling. In the WRITE case, integrity metadata will be generated using + * the block device's integrity function. In the READ case, the buffer + * will be prepared for DMA and a suitable end_io handler set up. + */ +bool bio_integrity_prep(struct bio *bio) +{ + struct bio_integrity_payload *bip; + struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk); + void *buf; + unsigned long start, end; + unsigned int len, nr_pages; + unsigned int bytes, offset, i; + + if (!bi) + return true; + + if (bio_op(bio) != REQ_OP_READ && bio_op(bio) != REQ_OP_WRITE) + return true; + + if (!bio_sectors(bio)) + return true; + + /* Already protected? */ + if (bio_integrity(bio)) + return true; + + if (bio_data_dir(bio) == READ) { + if (!bi->profile->verify_fn || + !(bi->flags & BLK_INTEGRITY_VERIFY)) + return true; + } else { + if (!bi->profile->generate_fn || + !(bi->flags & BLK_INTEGRITY_GENERATE)) + return true; + } + + /* Allocate kernel buffer for protection data */ + len = bio_integrity_bytes(bi, bio_sectors(bio)); + buf = kmalloc(len, GFP_NOIO); + if (unlikely(buf == NULL)) { + printk(KERN_ERR "could not allocate integrity buffer\n"); + goto err_end_io; + } + + end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; + start = ((unsigned long) buf) >> PAGE_SHIFT; + nr_pages = end - start; + + /* Allocate bio integrity payload and integrity vectors */ + bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); + if (IS_ERR(bip)) { + printk(KERN_ERR "could not allocate data integrity bioset\n"); + kfree(buf); + goto err_end_io; + } + + bip->bip_flags |= BIP_BLOCK_INTEGRITY; + bip_set_seed(bip, bio->bi_iter.bi_sector); + + if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM) + bip->bip_flags |= BIP_IP_CHECKSUM; + + /* Map it */ + offset = offset_in_page(buf); + for (i = 0; i < nr_pages && len > 0; i++) { + bytes = PAGE_SIZE - offset; + + if (bytes > len) + bytes = len; + + if (bio_integrity_add_page(bio, virt_to_page(buf), + bytes, offset) < bytes) { + printk(KERN_ERR "could not attach integrity payload\n"); + goto err_end_io; + } + + buf += bytes; + len -= bytes; + offset = 0; + } + + /* Auto-generate integrity metadata if this is a write */ + if (bio_data_dir(bio) == WRITE) { + bio_integrity_process(bio, &bio->bi_iter, + bi->profile->generate_fn); + } else { + bip->bio_iter = bio->bi_iter; + } + return true; + +err_end_io: + bio->bi_status = BLK_STS_RESOURCE; + bio_endio(bio); + return false; +} +EXPORT_SYMBOL(bio_integrity_prep); + +/** + * bio_integrity_verify_fn - Integrity I/O completion worker + * @work: Work struct stored in bio to be verified + * + * Description: This workqueue function is called to complete a READ + * request. The function verifies the transferred integrity metadata + * and then calls the original bio end_io function. + */ +static void bio_integrity_verify_fn(struct work_struct *work) +{ + struct bio_integrity_payload *bip = + container_of(work, struct bio_integrity_payload, bip_work); + struct bio *bio = bip->bip_bio; + struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk); + + /* + * At the moment verify is called bio's iterator was advanced + * during split and completion, we need to rewind iterator to + * it's original position. + */ + bio->bi_status = bio_integrity_process(bio, &bip->bio_iter, + bi->profile->verify_fn); + bio_integrity_free(bio); + bio_endio(bio); +} + +/** + * __bio_integrity_endio - Integrity I/O completion function + * @bio: Protected bio + * + * Description: Completion for integrity I/O + * + * Normally I/O completion is done in interrupt context. However, + * verifying I/O integrity is a time-consuming task which must be run + * in process context. This function postpones completion + * accordingly. + */ +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->profile->verify_fn) { + INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); + queue_work(kintegrityd_wq, &bip->bip_work); + return false; + } + + bio_integrity_free(bio); + return true; +} + +/** + * bio_integrity_advance - Advance integrity vector + * @bio: bio whose integrity vector to update + * @bytes_done: number of data bytes that have been completed + * + * Description: This function calculates how many integrity bytes the + * number of completed data bytes correspond to and advances the + * integrity vector accordingly. + */ +void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) +{ + struct bio_integrity_payload *bip = bio_integrity(bio); + struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk); + unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); + + bip->bip_iter.bi_sector += bio_integrity_intervals(bi, bytes_done >> 9); + bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); +} + +/** + * bio_integrity_trim - Trim integrity vector + * @bio: bio whose integrity vector to update + * + * Description: Used to trim the integrity vector in a cloned bio. + */ +void bio_integrity_trim(struct bio *bio) +{ + struct bio_integrity_payload *bip = bio_integrity(bio); + struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk); + + bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); +} +EXPORT_SYMBOL(bio_integrity_trim); + +/** + * bio_integrity_clone - Callback for cloning bios with integrity metadata + * @bio: New bio + * @bio_src: Original bio + * @gfp_mask: Memory allocation mask + * + * Description: Called to allocate a bip when cloning a bio + */ +int bio_integrity_clone(struct bio *bio, struct bio *bio_src, + gfp_t gfp_mask) +{ + struct bio_integrity_payload *bip_src = bio_integrity(bio_src); + struct bio_integrity_payload *bip; + + BUG_ON(bip_src == NULL); + + bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); + if (IS_ERR(bip)) + return PTR_ERR(bip); + + memcpy(bip->bip_vec, bip_src->bip_vec, + bip_src->bip_vcnt * sizeof(struct bio_vec)); + + bip->bip_vcnt = bip_src->bip_vcnt; + bip->bip_iter = bip_src->bip_iter; + bip->bip_flags = bip_src->bip_flags & ~BIP_BLOCK_INTEGRITY; + + return 0; +} + +int bioset_integrity_create(struct bio_set *bs, int pool_size) +{ + if (mempool_initialized(&bs->bio_integrity_pool)) + return 0; + + if (mempool_init_slab_pool(&bs->bio_integrity_pool, + pool_size, bip_slab)) + return -1; + + if (biovec_init_pool(&bs->bvec_integrity_pool, pool_size)) { + mempool_exit(&bs->bio_integrity_pool); + return -1; + } + + return 0; +} +EXPORT_SYMBOL(bioset_integrity_create); + +void bioset_integrity_free(struct bio_set *bs) +{ + mempool_exit(&bs->bio_integrity_pool); + mempool_exit(&bs->bvec_integrity_pool); +} + +void __init bio_integrity_init(void) +{ + /* + * kintegrityd won't block much but may burn a lot of CPU cycles. + * Make it highpri CPU intensive wq with max concurrency of 1. + */ + kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | + WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); + if (!kintegrityd_wq) + panic("Failed to create kintegrityd\n"); + + bip_slab = kmem_cache_create("bio_integrity_payload", + sizeof(struct bio_integrity_payload) + + sizeof(struct bio_vec) * BIO_INLINE_VECS, + 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); +} |