// 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/t10-pi.h>#include "blk.h" struct bio_integrity_alloc {	struct bio_integrity_payload	bip;	struct bio_vec			bvecs[];}; static mempool_t integrity_buf_pool; static bool bi_offload_capable(struct blk_integrity *bi){	return bi->metadata_size == bi->pi_tuple_size;} unsigned int __bio_integrity_action(struct bio *bio){	struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk); 	if (WARN_ON_ONCE(bio_has_crypt_ctx(bio)))		return 0; 	switch (bio_op(bio)) {	case REQ_OP_READ:		if (bi->flags & BLK_INTEGRITY_NOVERIFY) {			if (bi_offload_capable(bi))				return 0;			return BI_ACT_BUFFER;		}		return BI_ACT_BUFFER | BI_ACT_CHECK;	case REQ_OP_WRITE:	case REQ_OP_ZONE_APPEND:		/*		 * Flush masquerading as write?		 */		if (!bio_sectors(bio))			return 0; 		/*		 * Zero the memory allocated to not leak uninitialized kernel		 * memory to disk for non-integrity metadata where nothing else		 * initializes the memory.		 */		if (bi->flags & BLK_INTEGRITY_NOGENERATE) {			if (bi_offload_capable(bi))				return 0;			return BI_ACT_BUFFER | BI_ACT_ZERO;		} 		if (bi->metadata_size > bi->pi_tuple_size)			return BI_ACT_BUFFER | BI_ACT_CHECK | BI_ACT_ZERO;		return BI_ACT_BUFFER | BI_ACT_CHECK;	default:		return 0;	}}EXPORT_SYMBOL_GPL(__bio_integrity_action); void bio_integrity_alloc_buf(struct bio *bio, gfp_t gfp, bool zero_buffer){	struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);	struct bio_integrity_payload *bip = bio_integrity(bio);	unsigned int len = bio_integrity_bytes(bi, bio_sectors(bio));	void *buf; 	buf = kmalloc(len, gfp | __GFP_NOWARN | (zero_buffer ? __GFP_ZERO : 0));	if (unlikely(!buf)) {		struct page *page; 		page = mempool_alloc(&integrity_buf_pool, gfp);		if (zero_buffer)			memset(page_address(page), 0, len);		bvec_set_page(&bip->bip_vec[0], page, len, 0);		bip->bip_flags |= BIP_MEMPOOL;	} else {		bvec_set_page(&bip->bip_vec[0], virt_to_page(buf), len,				offset_in_page(buf));	} 	bip->bip_vcnt = 1;	bip->bip_iter.bi_size = len;} void bio_integrity_free_buf(struct bio_integrity_payload *bip){	struct bio_vec *bv = &bip->bip_vec[0]; 	if (bip->bip_flags & BIP_MEMPOOL)		mempool_free(bv->bv_page, &integrity_buf_pool);	else		kfree(bvec_virt(bv));} void bio_integrity_setup_default(struct bio *bio){	struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);	struct bio_integrity_payload *bip = bio_integrity(bio); 	bip_set_seed(bip, bio->bi_iter.bi_sector); 	if (bi->csum_type) {		bip->bip_flags |= BIP_CHECK_GUARD;		if (bi->csum_type == BLK_INTEGRITY_CSUM_IP)			bip->bip_flags |= BIP_IP_CHECKSUM;	}	if (bi->flags & BLK_INTEGRITY_REF_TAG)		bip->bip_flags |= BIP_CHECK_REFTAG;} /** * 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){	kfree(bio_integrity(bio));	bio->bi_integrity = NULL;	bio->bi_opf &= ~REQ_INTEGRITY;} void bio_integrity_init(struct bio *bio, struct bio_integrity_payload *bip,		struct bio_vec *bvecs, unsigned int nr_vecs){	memset(bip, 0, sizeof(*bip));	bip->bip_max_vcnt = nr_vecs;	if (nr_vecs)		bip->bip_vec = bvecs; 	bio->bi_integrity = bip;	bio->bi_opf |= REQ_INTEGRITY;} /** * 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_alloc *bia; 	if (WARN_ON_ONCE(bio_has_crypt_ctx(bio)))		return ERR_PTR(-EOPNOTSUPP); 	bia = kmalloc_flex(*bia, bvecs, nr_vecs, gfp_mask);	if (unlikely(!bia))		return ERR_PTR(-ENOMEM);	bio_integrity_init(bio, &bia->bip, bia->bvecs, nr_vecs);	return &bia->bip;}EXPORT_SYMBOL(bio_integrity_alloc); static void bio_integrity_unpin_bvec(struct bio_vec *bv, int nr_vecs){	int i; 	for (i = 0; i < nr_vecs; i++)		unpin_user_page(bv[i].bv_page);} static void bio_integrity_uncopy_user(struct bio_integrity_payload *bip){	unsigned short orig_nr_vecs = bip->bip_max_vcnt - 1;	struct bio_vec *orig_bvecs = &bip->bip_vec[1];	struct bio_vec *bounce_bvec = &bip->bip_vec[0];	size_t bytes = bounce_bvec->bv_len;	struct iov_iter orig_iter;	int ret; 	iov_iter_bvec(&orig_iter, ITER_DEST, orig_bvecs, orig_nr_vecs, bytes);	ret = copy_to_iter(bvec_virt(bounce_bvec), bytes, &orig_iter);	WARN_ON_ONCE(ret != bytes); 	bio_integrity_unpin_bvec(orig_bvecs, orig_nr_vecs);} /** * bio_integrity_unmap_user - Unmap user integrity payload * @bio:	bio containing bip to be unmapped * * Unmap the user mapped integrity portion of a bio. */void bio_integrity_unmap_user(struct bio *bio){	struct bio_integrity_payload *bip = bio_integrity(bio); 	if (bip->bip_flags & BIP_COPY_USER) {		if (bio_data_dir(bio) == READ)			bio_integrity_uncopy_user(bip);		kfree(bvec_virt(bip->bip_vec));		return;	} 	bio_integrity_unpin_bvec(bip->bip_vec, bip->bip_max_vcnt);} /** * 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_vcnt > 0) {		struct bio_vec *bv = &bip->bip_vec[bip->bip_vcnt - 1]; 		if (!zone_device_pages_compatible(bv->bv_page, page))			return 0;		if (zone_device_pages_have_same_pgmap(bv->bv_page, page) &&		    bvec_try_merge_hw_page(q, bv, page, len, offset)) {			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); static int bio_integrity_copy_user(struct bio *bio, struct bio_vec *bvec,				   int nr_vecs, unsigned int len){	bool write = op_is_write(bio_op(bio));	struct bio_integrity_payload *bip;	struct iov_iter iter;	void *buf;	int ret; 	buf = kmalloc(len, GFP_KERNEL);	if (!buf)		return -ENOMEM; 	if (write) {		iov_iter_bvec(&iter, ITER_SOURCE, bvec, nr_vecs, len);		if (!copy_from_iter_full(buf, len, &iter)) {			ret = -EFAULT;			goto free_buf;		} 		bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);	} else {		memset(buf, 0, len); 		/*		 * We need to preserve the original bvec and the number of vecs		 * in it for completion handling		 */		bip = bio_integrity_alloc(bio, GFP_KERNEL, nr_vecs + 1);	} 	if (IS_ERR(bip)) {		ret = PTR_ERR(bip);		goto free_buf;	} 	if (write)		bio_integrity_unpin_bvec(bvec, nr_vecs);	else		memcpy(&bip->bip_vec[1], bvec, nr_vecs * sizeof(*bvec)); 	ret = bio_integrity_add_page(bio, virt_to_page(buf), len,				     offset_in_page(buf));	if (ret != len) {		ret = -ENOMEM;		goto free_bip;	} 	bip->bip_flags |= BIP_COPY_USER;	return 0;free_bip:	bio_integrity_free(bio);free_buf:	kfree(buf);	return ret;} static int bio_integrity_init_user(struct bio *bio, struct bio_vec *bvec,				   int nr_vecs, unsigned int len){	struct bio_integrity_payload *bip; 	bip = bio_integrity_alloc(bio, GFP_KERNEL, nr_vecs);	if (IS_ERR(bip))		return PTR_ERR(bip); 	memcpy(bip->bip_vec, bvec, nr_vecs * sizeof(*bvec));	bip->bip_iter.bi_size = len;	bip->bip_vcnt = nr_vecs;	return 0;} static unsigned int bvec_from_pages(struct bio_vec *bvec, struct page **pages,				    int nr_vecs, ssize_t bytes, ssize_t offset,				    bool *is_p2p){	unsigned int nr_bvecs = 0;	int i, j; 	for (i = 0; i < nr_vecs; i = j) {		size_t size = min_t(size_t, bytes, PAGE_SIZE - offset);		struct folio *folio = page_folio(pages[i]); 		bytes -= size;		for (j = i + 1; j < nr_vecs; j++) {			size_t next = min_t(size_t, PAGE_SIZE, bytes); 			if (page_folio(pages[j]) != folio ||			    pages[j] != pages[j - 1] + 1)				break;			unpin_user_page(pages[j]);			size += next;			bytes -= next;		} 		if (is_pci_p2pdma_page(pages[i]))			*is_p2p = true; 		bvec_set_page(&bvec[nr_bvecs], pages[i], size, offset);		offset = 0;		nr_bvecs++;	} 	return nr_bvecs;} int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter){	struct request_queue *q = bdev_get_queue(bio->bi_bdev);	struct page *stack_pages[UIO_FASTIOV], **pages = stack_pages;	struct bio_vec stack_vec[UIO_FASTIOV], *bvec = stack_vec;	iov_iter_extraction_t extraction_flags = 0;	size_t offset, bytes = iter->count;	bool copy, is_p2p = false;	unsigned int nr_bvecs;	int ret, nr_vecs; 	if (bio_integrity(bio))		return -EINVAL;	if (bytes >> SECTOR_SHIFT > queue_max_hw_sectors(q))		return -E2BIG; 	nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS + 1);	if (nr_vecs > BIO_MAX_VECS)		return -E2BIG;	if (nr_vecs > UIO_FASTIOV) {		bvec = kzalloc_objs(*bvec, nr_vecs);		if (!bvec)			return -ENOMEM;		pages = NULL;	} 	copy = iov_iter_alignment(iter) &			blk_lim_dma_alignment_and_pad(&q->limits); 	if (blk_queue_pci_p2pdma(q))		extraction_flags |= ITER_ALLOW_P2PDMA; 	ret = iov_iter_extract_pages(iter, &pages, bytes, nr_vecs,					extraction_flags, &offset);	if (unlikely(ret < 0))		goto free_bvec; 	/*	 * Handle partial pinning. This can happen when pin_user_pages_fast()	 * returns fewer pages than requested.	 */	if (user_backed_iter(iter) && unlikely(ret != bytes)) {		if (ret > 0) {			int npinned = DIV_ROUND_UP(offset + ret, PAGE_SIZE);			int i; 			for (i = 0; i < npinned; i++)				unpin_user_page(pages[i]);		}		if (pages != stack_pages)			kvfree(pages);		ret = -EFAULT;		goto free_bvec;	} 	nr_bvecs = bvec_from_pages(bvec, pages, nr_vecs, bytes, offset,				   &is_p2p);	if (pages != stack_pages)		kvfree(pages);	if (nr_bvecs > queue_max_integrity_segments(q))		copy = true;	if (is_p2p)		bio->bi_opf |= REQ_NOMERGE; 	if (copy)		ret = bio_integrity_copy_user(bio, bvec, nr_bvecs, bytes);	else		ret = bio_integrity_init_user(bio, bvec, nr_bvecs, bytes);	if (ret)		goto release_pages;	if (bvec != stack_vec)		kfree(bvec); 	return 0; release_pages:	bio_integrity_unpin_bvec(bvec, nr_bvecs);free_bvec:	if (bvec != stack_vec)		kfree(bvec);	return ret;} static void bio_uio_meta_to_bip(struct bio *bio, struct uio_meta *meta){	struct bio_integrity_payload *bip = bio_integrity(bio); 	if (meta->flags & IO_INTEGRITY_CHK_GUARD)		bip->bip_flags |= BIP_CHECK_GUARD;	if (meta->flags & IO_INTEGRITY_CHK_APPTAG)		bip->bip_flags |= BIP_CHECK_APPTAG;	if (meta->flags & IO_INTEGRITY_CHK_REFTAG)		bip->bip_flags |= BIP_CHECK_REFTAG; 	bip->app_tag = meta->app_tag;} int bio_integrity_map_iter(struct bio *bio, struct uio_meta *meta){	struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);	unsigned int integrity_bytes;	int ret;	struct iov_iter it; 	if (!bi)		return -EINVAL;	/*	 * original meta iterator can be bigger.	 * process integrity info corresponding to current data buffer only.	 */	it = meta->iter;	integrity_bytes = bio_integrity_bytes(bi, bio_sectors(bio));	if (it.count < integrity_bytes)		return -EINVAL; 	/* should fit into two bytes */	BUILD_BUG_ON(IO_INTEGRITY_VALID_FLAGS >= (1 << 16)); 	if (meta->flags && (meta->flags & ~IO_INTEGRITY_VALID_FLAGS))		return -EINVAL; 	it.count = integrity_bytes;	ret = bio_integrity_map_user(bio, &it);	if (!ret) {		bio_uio_meta_to_bip(bio, meta);		bip_set_seed(bio_integrity(bio), meta->seed);		iov_iter_advance(&meta->iter, integrity_bytes);		meta->seed += bio_integrity_intervals(bi, bio_sectors(bio));	}	return ret;} /** * bio_integrity_advance - Advance integrity vector

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