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![Christoph Hellwig](/assets/img/avatar_default.png)
Instead of encoding of the bvec pool using magic bio flags, just use a helper to find the pool based on the max_vecs value. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
470 lines
12 KiB
C
470 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* bio-integrity.c - bio data integrity extensions
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*
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* Copyright (C) 2007, 2008, 2009 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*/
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#include <linux/blkdev.h>
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#include <linux/mempool.h>
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#include <linux/export.h>
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#include <linux/bio.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include "blk.h"
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static struct kmem_cache *bip_slab;
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static struct workqueue_struct *kintegrityd_wq;
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void blk_flush_integrity(void)
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{
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flush_workqueue(kintegrityd_wq);
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}
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static void __bio_integrity_free(struct bio_set *bs,
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struct bio_integrity_payload *bip)
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{
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if (bs && mempool_initialized(&bs->bio_integrity_pool)) {
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if (bip->bip_vec)
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bvec_free(&bs->bvec_integrity_pool, bip->bip_vec,
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bip->bip_max_vcnt);
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mempool_free(bip, &bs->bio_integrity_pool);
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} else {
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kfree(bip);
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}
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}
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/**
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* bio_integrity_alloc - Allocate integrity payload and attach it to bio
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* @bio: bio to attach integrity metadata to
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* @gfp_mask: Memory allocation mask
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* @nr_vecs: Number of integrity metadata scatter-gather elements
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*
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* Description: This function prepares a bio for attaching integrity
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* metadata. nr_vecs specifies the maximum number of pages containing
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* integrity metadata that can be attached.
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*/
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struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
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gfp_t gfp_mask,
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unsigned int nr_vecs)
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{
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struct bio_integrity_payload *bip;
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struct bio_set *bs = bio->bi_pool;
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unsigned inline_vecs;
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if (WARN_ON_ONCE(bio_has_crypt_ctx(bio)))
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return ERR_PTR(-EOPNOTSUPP);
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if (!bs || !mempool_initialized(&bs->bio_integrity_pool)) {
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bip = kmalloc(struct_size(bip, bip_inline_vecs, nr_vecs), gfp_mask);
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inline_vecs = nr_vecs;
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} else {
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bip = mempool_alloc(&bs->bio_integrity_pool, gfp_mask);
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inline_vecs = BIO_INLINE_VECS;
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}
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if (unlikely(!bip))
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return ERR_PTR(-ENOMEM);
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memset(bip, 0, sizeof(*bip));
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if (nr_vecs > inline_vecs) {
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bip->bip_max_vcnt = nr_vecs;
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bip->bip_vec = bvec_alloc(&bs->bvec_integrity_pool,
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&bip->bip_max_vcnt, gfp_mask);
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if (!bip->bip_vec)
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goto err;
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} else {
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bip->bip_vec = bip->bip_inline_vecs;
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bip->bip_max_vcnt = inline_vecs;
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}
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bip->bip_bio = bio;
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bio->bi_integrity = bip;
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bio->bi_opf |= REQ_INTEGRITY;
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return bip;
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err:
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__bio_integrity_free(bs, bip);
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return ERR_PTR(-ENOMEM);
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}
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EXPORT_SYMBOL(bio_integrity_alloc);
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/**
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* bio_integrity_free - Free bio integrity payload
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* @bio: bio containing bip to be freed
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*
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* Description: Used to free the integrity portion of a bio. Usually
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* called from bio_free().
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*/
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void bio_integrity_free(struct bio *bio)
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{
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct bio_set *bs = bio->bi_pool;
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if (bip->bip_flags & BIP_BLOCK_INTEGRITY)
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kfree(page_address(bip->bip_vec->bv_page) +
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bip->bip_vec->bv_offset);
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__bio_integrity_free(bs, bip);
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bio->bi_integrity = NULL;
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bio->bi_opf &= ~REQ_INTEGRITY;
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}
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/**
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* bio_integrity_add_page - Attach integrity metadata
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* @bio: bio to update
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* @page: page containing integrity metadata
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* @len: number of bytes of integrity metadata in page
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* @offset: start offset within page
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*
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* Description: Attach a page containing integrity metadata to bio.
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*/
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int bio_integrity_add_page(struct bio *bio, struct page *page,
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unsigned int len, unsigned int offset)
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{
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct bio_vec *iv;
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if (bip->bip_vcnt >= bip->bip_max_vcnt) {
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printk(KERN_ERR "%s: bip_vec full\n", __func__);
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return 0;
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}
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iv = bip->bip_vec + bip->bip_vcnt;
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if (bip->bip_vcnt &&
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bvec_gap_to_prev(bio->bi_bdev->bd_disk->queue,
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&bip->bip_vec[bip->bip_vcnt - 1], offset))
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return 0;
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iv->bv_page = page;
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iv->bv_len = len;
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iv->bv_offset = offset;
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bip->bip_vcnt++;
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return len;
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}
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EXPORT_SYMBOL(bio_integrity_add_page);
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/**
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* bio_integrity_process - Process integrity metadata for a bio
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* @bio: bio to generate/verify integrity metadata for
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* @proc_iter: iterator to process
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* @proc_fn: Pointer to the relevant processing function
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*/
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static blk_status_t bio_integrity_process(struct bio *bio,
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struct bvec_iter *proc_iter, integrity_processing_fn *proc_fn)
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{
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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struct blk_integrity_iter iter;
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struct bvec_iter bviter;
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struct bio_vec bv;
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struct bio_integrity_payload *bip = bio_integrity(bio);
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blk_status_t ret = BLK_STS_OK;
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void *prot_buf = page_address(bip->bip_vec->bv_page) +
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bip->bip_vec->bv_offset;
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iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
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iter.interval = 1 << bi->interval_exp;
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iter.seed = proc_iter->bi_sector;
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iter.prot_buf = prot_buf;
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__bio_for_each_segment(bv, bio, bviter, *proc_iter) {
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void *kaddr = kmap_atomic(bv.bv_page);
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iter.data_buf = kaddr + bv.bv_offset;
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iter.data_size = bv.bv_len;
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ret = proc_fn(&iter);
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if (ret) {
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kunmap_atomic(kaddr);
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return ret;
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}
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kunmap_atomic(kaddr);
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}
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return ret;
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}
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/**
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* bio_integrity_prep - Prepare bio for integrity I/O
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* @bio: bio to prepare
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*
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* Description: Checks if the bio already has an integrity payload attached.
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* If it does, the payload has been generated by another kernel subsystem,
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* and we just pass it through. Otherwise allocates integrity payload.
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* The bio must have data direction, target device and start sector set priot
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* to calling. In the WRITE case, integrity metadata will be generated using
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* the block device's integrity function. In the READ case, the buffer
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* will be prepared for DMA and a suitable end_io handler set up.
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*/
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bool bio_integrity_prep(struct bio *bio)
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{
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struct bio_integrity_payload *bip;
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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struct request_queue *q = bio->bi_bdev->bd_disk->queue;
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void *buf;
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unsigned long start, end;
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unsigned int len, nr_pages;
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unsigned int bytes, offset, i;
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unsigned int intervals;
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blk_status_t status;
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if (!bi)
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return true;
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if (bio_op(bio) != REQ_OP_READ && bio_op(bio) != REQ_OP_WRITE)
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return true;
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if (!bio_sectors(bio))
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return true;
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/* Already protected? */
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if (bio_integrity(bio))
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return true;
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if (bio_data_dir(bio) == READ) {
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if (!bi->profile->verify_fn ||
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!(bi->flags & BLK_INTEGRITY_VERIFY))
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return true;
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} else {
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if (!bi->profile->generate_fn ||
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!(bi->flags & BLK_INTEGRITY_GENERATE))
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return true;
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}
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intervals = bio_integrity_intervals(bi, bio_sectors(bio));
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/* Allocate kernel buffer for protection data */
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len = intervals * bi->tuple_size;
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buf = kmalloc(len, GFP_NOIO | q->bounce_gfp);
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status = BLK_STS_RESOURCE;
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if (unlikely(buf == NULL)) {
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printk(KERN_ERR "could not allocate integrity buffer\n");
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goto err_end_io;
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}
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end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
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start = ((unsigned long) buf) >> PAGE_SHIFT;
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nr_pages = end - start;
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/* Allocate bio integrity payload and integrity vectors */
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bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages);
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if (IS_ERR(bip)) {
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printk(KERN_ERR "could not allocate data integrity bioset\n");
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kfree(buf);
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status = BLK_STS_RESOURCE;
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goto err_end_io;
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}
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bip->bip_flags |= BIP_BLOCK_INTEGRITY;
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bip->bip_iter.bi_size = len;
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bip_set_seed(bip, bio->bi_iter.bi_sector);
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if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM)
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bip->bip_flags |= BIP_IP_CHECKSUM;
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/* Map it */
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offset = offset_in_page(buf);
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for (i = 0 ; i < nr_pages ; i++) {
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int ret;
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bytes = PAGE_SIZE - offset;
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if (len <= 0)
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break;
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if (bytes > len)
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bytes = len;
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ret = bio_integrity_add_page(bio, virt_to_page(buf),
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bytes, offset);
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if (ret == 0) {
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printk(KERN_ERR "could not attach integrity payload\n");
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status = BLK_STS_RESOURCE;
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goto err_end_io;
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}
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if (ret < bytes)
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break;
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buf += bytes;
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len -= bytes;
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offset = 0;
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}
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/* Auto-generate integrity metadata if this is a write */
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if (bio_data_dir(bio) == WRITE) {
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bio_integrity_process(bio, &bio->bi_iter,
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bi->profile->generate_fn);
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} else {
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bip->bio_iter = bio->bi_iter;
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}
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return true;
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err_end_io:
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bio->bi_status = status;
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bio_endio(bio);
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return false;
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}
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EXPORT_SYMBOL(bio_integrity_prep);
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/**
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* bio_integrity_verify_fn - Integrity I/O completion worker
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* @work: Work struct stored in bio to be verified
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*
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* Description: This workqueue function is called to complete a READ
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* request. The function verifies the transferred integrity metadata
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* and then calls the original bio end_io function.
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*/
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static void bio_integrity_verify_fn(struct work_struct *work)
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{
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struct bio_integrity_payload *bip =
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container_of(work, struct bio_integrity_payload, bip_work);
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struct bio *bio = bip->bip_bio;
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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/*
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* At the moment verify is called bio's iterator was advanced
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* during split and completion, we need to rewind iterator to
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* it's original position.
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*/
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bio->bi_status = bio_integrity_process(bio, &bip->bio_iter,
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bi->profile->verify_fn);
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bio_integrity_free(bio);
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bio_endio(bio);
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}
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/**
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* __bio_integrity_endio - Integrity I/O completion function
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* @bio: Protected bio
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*
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* Description: Completion for integrity I/O
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*
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* Normally I/O completion is done in interrupt context. However,
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* verifying I/O integrity is a time-consuming task which must be run
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* in process context. This function postpones completion
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* accordingly.
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*/
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bool __bio_integrity_endio(struct bio *bio)
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{
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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struct bio_integrity_payload *bip = bio_integrity(bio);
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if (bio_op(bio) == REQ_OP_READ && !bio->bi_status &&
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(bip->bip_flags & BIP_BLOCK_INTEGRITY) && bi->profile->verify_fn) {
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INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
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queue_work(kintegrityd_wq, &bip->bip_work);
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return false;
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}
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bio_integrity_free(bio);
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return true;
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}
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/**
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* bio_integrity_advance - Advance integrity vector
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* @bio: bio whose integrity vector to update
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* @bytes_done: number of data bytes that have been completed
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*
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* Description: This function calculates how many integrity bytes the
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* number of completed data bytes correspond to and advances the
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* integrity vector accordingly.
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*/
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void bio_integrity_advance(struct bio *bio, unsigned int bytes_done)
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{
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9);
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bip->bip_iter.bi_sector += bytes_done >> 9;
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bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes);
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}
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/**
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* bio_integrity_trim - Trim integrity vector
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* @bio: bio whose integrity vector to update
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*
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* Description: Used to trim the integrity vector in a cloned bio.
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*/
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void bio_integrity_trim(struct bio *bio)
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{
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struct bio_integrity_payload *bip = bio_integrity(bio);
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struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
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bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio));
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}
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EXPORT_SYMBOL(bio_integrity_trim);
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/**
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* bio_integrity_clone - Callback for cloning bios with integrity metadata
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* @bio: New bio
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* @bio_src: Original bio
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* @gfp_mask: Memory allocation mask
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*
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* Description: Called to allocate a bip when cloning a bio
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*/
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int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
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gfp_t gfp_mask)
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{
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struct bio_integrity_payload *bip_src = bio_integrity(bio_src);
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struct bio_integrity_payload *bip;
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BUG_ON(bip_src == NULL);
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bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
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if (IS_ERR(bip))
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return PTR_ERR(bip);
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memcpy(bip->bip_vec, bip_src->bip_vec,
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bip_src->bip_vcnt * sizeof(struct bio_vec));
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bip->bip_vcnt = bip_src->bip_vcnt;
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bip->bip_iter = bip_src->bip_iter;
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return 0;
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}
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EXPORT_SYMBOL(bio_integrity_clone);
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int bioset_integrity_create(struct bio_set *bs, int pool_size)
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{
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if (mempool_initialized(&bs->bio_integrity_pool))
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return 0;
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if (mempool_init_slab_pool(&bs->bio_integrity_pool,
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pool_size, bip_slab))
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return -1;
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if (biovec_init_pool(&bs->bvec_integrity_pool, pool_size)) {
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mempool_exit(&bs->bio_integrity_pool);
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return -1;
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}
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return 0;
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}
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EXPORT_SYMBOL(bioset_integrity_create);
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void bioset_integrity_free(struct bio_set *bs)
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{
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mempool_exit(&bs->bio_integrity_pool);
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mempool_exit(&bs->bvec_integrity_pool);
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}
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void __init bio_integrity_init(void)
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{
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/*
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* kintegrityd won't block much but may burn a lot of CPU cycles.
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* Make it highpri CPU intensive wq with max concurrency of 1.
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*/
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kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM |
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WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1);
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if (!kintegrityd_wq)
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panic("Failed to create kintegrityd\n");
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bip_slab = kmem_cache_create("bio_integrity_payload",
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sizeof(struct bio_integrity_payload) +
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sizeof(struct bio_vec) * BIO_INLINE_VECS,
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0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
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}
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