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block: Block layer data integrity support
Some block devices support verifying the integrity of requests by way of checksums or other protection information that is submitted along with the I/O. This patch implements support for generating and verifying integrity metadata, as well as correctly merging, splitting and cloning bios and requests that have this extra information attached. See Documentation/block/data-integrity.txt for more information. Signed-off-by: Martin K. Petersen <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Martin K. Petersen
Jens Axboe
parent
51d654e1d8
commit
7ba1ba12ee
13 changed files with 1355 additions and 7 deletions
708
fs/bio-integrity.c
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708
fs/bio-integrity.c
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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 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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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/bio.h>
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#include <linux/workqueue.h>
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static struct kmem_cache *bio_integrity_slab __read_mostly;
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static struct workqueue_struct *kintegrityd_wq;
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/**
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* bio_integrity_alloc_bioset - 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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* @bs: bio_set to allocate from
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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_bioset(struct bio *bio, gfp_t gfp_mask, unsigned int nr_vecs, struct bio_set *bs)
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{
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struct bio_integrity_payload *bip;
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struct bio_vec *iv;
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unsigned long idx;
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BUG_ON(bio == NULL);
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bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
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if (unlikely(bip == NULL)) {
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printk(KERN_ERR "%s: could not alloc bip\n", __func__);
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return NULL;
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}
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memset(bip, 0, sizeof(*bip));
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iv = bvec_alloc_bs(gfp_mask, nr_vecs, &idx, bs);
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if (unlikely(iv == NULL)) {
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printk(KERN_ERR "%s: could not alloc bip_vec\n", __func__);
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mempool_free(bip, bs->bio_integrity_pool);
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return NULL;
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}
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bip->bip_pool = idx;
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bip->bip_vec = iv;
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bip->bip_bio = bio;
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bio->bi_integrity = bip;
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return bip;
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}
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EXPORT_SYMBOL(bio_integrity_alloc_bioset);
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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, gfp_t gfp_mask, unsigned int nr_vecs)
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{
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return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set);
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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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* @bs: bio_set this bio was allocated from
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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, struct bio_set *bs)
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{
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struct bio_integrity_payload *bip = bio->bi_integrity;
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BUG_ON(bip == NULL);
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/* A cloned bio doesn't own the integrity metadata */
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if (!bio_flagged(bio, BIO_CLONED) && bip->bip_buf != NULL)
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kfree(bip->bip_buf);
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mempool_free(bip->bip_vec, bs->bvec_pools[bip->bip_pool]);
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mempool_free(bip, bs->bio_integrity_pool);
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bio->bi_integrity = NULL;
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}
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EXPORT_SYMBOL(bio_integrity_free);
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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->bi_integrity;
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struct bio_vec *iv;
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if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_pool)) {
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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_vec_idx(bip, bip->bip_vcnt);
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BUG_ON(iv == NULL);
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BUG_ON(iv->bv_page != NULL);
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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_enabled - Check whether integrity can be passed
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* @bio: bio to check
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*
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* Description: Determines whether bio_integrity_prep() can be called
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* on this bio or not. bio data direction and target device must be
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* set prior to calling. The functions honors the write_generate and
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* read_verify flags in sysfs.
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*/
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int bio_integrity_enabled(struct bio *bio)
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{
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/* Already protected? */
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if (bio_integrity(bio))
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return 0;
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return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio));
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}
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EXPORT_SYMBOL(bio_integrity_enabled);
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/**
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* bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto
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* @bi: blk_integrity profile for device
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* @sectors: Number of 512 sectors to convert
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*
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* Description: The block layer calculates everything in 512 byte
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* sectors but integrity metadata is done in terms of the hardware
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* sector size of the storage device. Convert the block layer sectors
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* to physical sectors.
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*/
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static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, unsigned int sectors)
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{
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/* At this point there are only 512b or 4096b DIF/EPP devices */
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if (bi->sector_size == 4096)
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return sectors >>= 3;
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return sectors;
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}
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/**
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* bio_integrity_tag_size - Retrieve integrity tag space
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* @bio: bio to inspect
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*
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* Description: Returns the maximum number of tag bytes that can be
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* attached to this bio. Filesystems can use this to determine how
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* much metadata to attach to an I/O.
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*/
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unsigned int bio_integrity_tag_size(struct bio *bio)
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{
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struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
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BUG_ON(bio->bi_size == 0);
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return bi->tag_size * (bio->bi_size / bi->sector_size);
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}
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EXPORT_SYMBOL(bio_integrity_tag_size);
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int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set)
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{
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struct bio_integrity_payload *bip = bio->bi_integrity;
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struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
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unsigned int nr_sectors;
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BUG_ON(bip->bip_buf == NULL);
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if (bi->tag_size == 0)
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return -1;
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nr_sectors = bio_integrity_hw_sectors(bi, DIV_ROUND_UP(len, bi->tag_size));
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if (nr_sectors * bi->tuple_size > bip->bip_size) {
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printk(KERN_ERR "%s: tag too big for bio: %u > %u\n",
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__func__, nr_sectors * bi->tuple_size, bip->bip_size);
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return -1;
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}
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if (set)
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bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors);
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else
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bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors);
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return 0;
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}
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/**
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* bio_integrity_set_tag - Attach a tag buffer to a bio
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* @bio: bio to attach buffer to
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* @tag_buf: Pointer to a buffer containing tag data
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* @len: Length of the included buffer
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*
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* Description: Use this function to tag a bio by leveraging the extra
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* space provided by devices formatted with integrity protection. The
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* size of the integrity buffer must be <= to the size reported by
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* bio_integrity_tag_size().
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*/
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int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len)
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{
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BUG_ON(bio_data_dir(bio) != WRITE);
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return bio_integrity_tag(bio, tag_buf, len, 1);
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}
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EXPORT_SYMBOL(bio_integrity_set_tag);
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/**
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* bio_integrity_get_tag - Retrieve a tag buffer from a bio
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* @bio: bio to retrieve buffer from
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* @tag_buf: Pointer to a buffer for the tag data
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* @len: Length of the target buffer
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*
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* Description: Use this function to retrieve the tag buffer from a
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* completed I/O. The size of the integrity buffer must be <= to the
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* size reported by bio_integrity_tag_size().
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*/
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int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len)
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{
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BUG_ON(bio_data_dir(bio) != READ);
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return bio_integrity_tag(bio, tag_buf, len, 0);
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}
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EXPORT_SYMBOL(bio_integrity_get_tag);
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/**
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* bio_integrity_generate - Generate integrity metadata for a bio
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* @bio: bio to generate integrity metadata for
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*
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* Description: Generates integrity metadata for a bio by calling the
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* block device's generation callback function. The bio must have a
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* bip attached with enough room to accommodate the generated
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* integrity metadata.
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*/
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static void bio_integrity_generate(struct bio *bio)
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{
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struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
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struct blk_integrity_exchg bix;
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struct bio_vec *bv;
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sector_t sector = bio->bi_sector;
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unsigned int i, sectors, total;
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void *prot_buf = bio->bi_integrity->bip_buf;
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total = 0;
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bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
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bix.sector_size = bi->sector_size;
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bio_for_each_segment(bv, bio, i) {
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void *kaddr = kmap_atomic(bv->bv_page, KM_USER0);
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bix.data_buf = kaddr + bv->bv_offset;
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bix.data_size = bv->bv_len;
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bix.prot_buf = prot_buf;
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bix.sector = sector;
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bi->generate_fn(&bix);
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sectors = bv->bv_len / bi->sector_size;
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sector += sectors;
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prot_buf += sectors * bi->tuple_size;
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total += sectors * bi->tuple_size;
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BUG_ON(total > bio->bi_integrity->bip_size);
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kunmap_atomic(kaddr, KM_USER0);
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}
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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: Allocates a buffer for integrity metadata, maps the
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* pages and attaches them to a bio. The bio must have data
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* direction, target device and start sector set priot to calling. In
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* the WRITE case, integrity metadata will be generated using the
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* 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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int 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;
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struct request_queue *q;
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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 sectors;
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bi = bdev_get_integrity(bio->bi_bdev);
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q = bdev_get_queue(bio->bi_bdev);
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BUG_ON(bi == NULL);
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BUG_ON(bio_integrity(bio));
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sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio));
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/* Allocate kernel buffer for protection data */
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len = sectors * blk_integrity_tuple_size(bi);
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buf = kmalloc(len, GFP_NOIO | __GFP_NOFAIL | q->bounce_gfp);
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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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return -EIO;
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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 (unlikely(bip == NULL)) {
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printk(KERN_ERR "could not allocate data integrity bioset\n");
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kfree(buf);
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return -EIO;
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}
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bip->bip_buf = buf;
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bip->bip_size = len;
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bip->bip_sector = bio->bi_sector;
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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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return 0;
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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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/* Install custom I/O completion handler if read verify is enabled */
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if (bio_data_dir(bio) == READ) {
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bip->bip_end_io = bio->bi_end_io;
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bio->bi_end_io = bio_integrity_endio;
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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_generate(bio);
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return 0;
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}
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EXPORT_SYMBOL(bio_integrity_prep);
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/**
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* bio_integrity_verify - Verify integrity metadata for a bio
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* @bio: bio to verify
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*
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* Description: This function is called to verify the integrity of a
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* bio. The data in the bio io_vec is compared to the integrity
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* metadata returned by the HBA.
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*/
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static int bio_integrity_verify(struct bio *bio)
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{
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struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
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struct blk_integrity_exchg bix;
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struct bio_vec *bv;
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sector_t sector = bio->bi_integrity->bip_sector;
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unsigned int i, sectors, total, ret;
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void *prot_buf = bio->bi_integrity->bip_buf;
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ret = total = 0;
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bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
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bix.sector_size = bi->sector_size;
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bio_for_each_segment(bv, bio, i) {
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void *kaddr = kmap_atomic(bv->bv_page, KM_USER0);
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bix.data_buf = kaddr + bv->bv_offset;
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bix.data_size = bv->bv_len;
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bix.prot_buf = prot_buf;
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bix.sector = sector;
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ret = bi->verify_fn(&bix);
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if (ret) {
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kunmap_atomic(kaddr, KM_USER0);
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break;
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}
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sectors = bv->bv_len / bi->sector_size;
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sector += sectors;
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prot_buf += sectors * bi->tuple_size;
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total += sectors * bi->tuple_size;
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BUG_ON(total > bio->bi_integrity->bip_size);
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kunmap_atomic(kaddr, KM_USER0);
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}
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return ret;
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}
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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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{
|
||||
struct bio_integrity_payload *bip =
|
||||
container_of(work, struct bio_integrity_payload, bip_work);
|
||||
struct bio *bio = bip->bip_bio;
|
||||
int error = bip->bip_error;
|
||||
|
||||
if (bio_integrity_verify(bio)) {
|
||||
clear_bit(BIO_UPTODATE, &bio->bi_flags);
|
||||
error = -EIO;
|
||||
}
|
||||
|
||||
/* Restore original bio completion handler */
|
||||
bio->bi_end_io = bip->bip_end_io;
|
||||
|
||||
if (bio->bi_end_io)
|
||||
bio->bi_end_io(bio, error);
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_endio - Integrity I/O completion function
|
||||
* @bio: Protected bio
|
||||
* @error: Pointer to errno
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
void bio_integrity_endio(struct bio *bio, int error)
|
||||
{
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
|
||||
BUG_ON(bip->bip_bio != bio);
|
||||
|
||||
bip->bip_error = error;
|
||||
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
|
||||
queue_work(kintegrityd_wq, &bip->bip_work);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_endio);
|
||||
|
||||
/**
|
||||
* bio_integrity_mark_head - Advance bip_vec skip bytes
|
||||
* @bip: Integrity vector to advance
|
||||
* @skip: Number of bytes to advance it
|
||||
*/
|
||||
void bio_integrity_mark_head(struct bio_integrity_payload *bip, unsigned int skip)
|
||||
{
|
||||
struct bio_vec *iv;
|
||||
unsigned int i;
|
||||
|
||||
bip_for_each_vec(iv, bip, i) {
|
||||
if (skip == 0) {
|
||||
bip->bip_idx = i;
|
||||
return;
|
||||
} else if (skip >= iv->bv_len) {
|
||||
skip -= iv->bv_len;
|
||||
} else { /* skip < iv->bv_len) */
|
||||
iv->bv_offset += skip;
|
||||
iv->bv_len -= skip;
|
||||
bip->bip_idx = i;
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* bio_integrity_mark_tail - Truncate bip_vec to be len bytes long
|
||||
* @bip: Integrity vector to truncate
|
||||
* @len: New length of integrity vector
|
||||
*/
|
||||
void bio_integrity_mark_tail(struct bio_integrity_payload *bip, unsigned int len)
|
||||
{
|
||||
struct bio_vec *iv;
|
||||
unsigned int i;
|
||||
|
||||
bip_for_each_vec(iv, bip, i) {
|
||||
if (len == 0) {
|
||||
bip->bip_vcnt = i;
|
||||
return;
|
||||
} else if (len >= iv->bv_len) {
|
||||
len -= iv->bv_len;
|
||||
} else { /* len < iv->bv_len) */
|
||||
iv->bv_len = len;
|
||||
len = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 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->bi_integrity;
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
unsigned int nr_sectors;
|
||||
|
||||
BUG_ON(bip == NULL);
|
||||
BUG_ON(bi == NULL);
|
||||
|
||||
nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9);
|
||||
bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_advance);
|
||||
|
||||
/**
|
||||
* bio_integrity_trim - Trim integrity vector
|
||||
* @bio: bio whose integrity vector to update
|
||||
* @offset: offset to first data sector
|
||||
* @sectors: number of data sectors
|
||||
*
|
||||
* Description: Used to trim the integrity vector in a cloned bio.
|
||||
* The ivec will be advanced corresponding to 'offset' data sectors
|
||||
* and the length will be truncated corresponding to 'len' data
|
||||
* sectors.
|
||||
*/
|
||||
void bio_integrity_trim(struct bio *bio, unsigned int offset, unsigned int sectors)
|
||||
{
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
|
||||
unsigned int nr_sectors;
|
||||
|
||||
BUG_ON(bip == NULL);
|
||||
BUG_ON(bi == NULL);
|
||||
BUG_ON(!bio_flagged(bio, BIO_CLONED));
|
||||
|
||||
nr_sectors = bio_integrity_hw_sectors(bi, sectors);
|
||||
bip->bip_sector = bip->bip_sector + offset;
|
||||
bio_integrity_mark_head(bip, offset * bi->tuple_size);
|
||||
bio_integrity_mark_tail(bip, sectors * bi->tuple_size);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_trim);
|
||||
|
||||
/**
|
||||
* bio_integrity_split - Split integrity metadata
|
||||
* @bio: Protected bio
|
||||
* @bp: Resulting bio_pair
|
||||
* @sectors: Offset
|
||||
*
|
||||
* Description: Splits an integrity page into a bio_pair.
|
||||
*/
|
||||
void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors)
|
||||
{
|
||||
struct blk_integrity *bi;
|
||||
struct bio_integrity_payload *bip = bio->bi_integrity;
|
||||
unsigned int nr_sectors;
|
||||
|
||||
if (bio_integrity(bio) == 0)
|
||||
return;
|
||||
|
||||
bi = bdev_get_integrity(bio->bi_bdev);
|
||||
BUG_ON(bi == NULL);
|
||||
BUG_ON(bip->bip_vcnt != 1);
|
||||
|
||||
nr_sectors = bio_integrity_hw_sectors(bi, sectors);
|
||||
|
||||
bp->bio1.bi_integrity = &bp->bip1;
|
||||
bp->bio2.bi_integrity = &bp->bip2;
|
||||
|
||||
bp->iv1 = bip->bip_vec[0];
|
||||
bp->iv2 = bip->bip_vec[0];
|
||||
|
||||
bp->bip1.bip_vec = &bp->iv1;
|
||||
bp->bip2.bip_vec = &bp->iv2;
|
||||
|
||||
bp->iv1.bv_len = sectors * bi->tuple_size;
|
||||
bp->iv2.bv_offset += sectors * bi->tuple_size;
|
||||
bp->iv2.bv_len -= sectors * bi->tuple_size;
|
||||
|
||||
bp->bip1.bip_sector = bio->bi_integrity->bip_sector;
|
||||
bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors;
|
||||
|
||||
bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1;
|
||||
bp->bip1.bip_idx = bp->bip2.bip_idx = 0;
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_split);
|
||||
|
||||
/**
|
||||
* bio_integrity_clone - Callback for cloning bios with integrity metadata
|
||||
* @bio: New bio
|
||||
* @bio_src: Original bio
|
||||
* @bs: bio_set to allocate bip from
|
||||
*
|
||||
* Description: Called to allocate a bip when cloning a bio
|
||||
*/
|
||||
int bio_integrity_clone(struct bio *bio, struct bio *bio_src, struct bio_set *bs)
|
||||
{
|
||||
struct bio_integrity_payload *bip_src = bio_src->bi_integrity;
|
||||
struct bio_integrity_payload *bip;
|
||||
|
||||
BUG_ON(bip_src == NULL);
|
||||
|
||||
bip = bio_integrity_alloc_bioset(bio, GFP_NOIO, bip_src->bip_vcnt, bs);
|
||||
|
||||
if (bip == NULL)
|
||||
return -EIO;
|
||||
|
||||
memcpy(bip->bip_vec, bip_src->bip_vec,
|
||||
bip_src->bip_vcnt * sizeof(struct bio_vec));
|
||||
|
||||
bip->bip_sector = bip_src->bip_sector;
|
||||
bip->bip_vcnt = bip_src->bip_vcnt;
|
||||
bip->bip_idx = bip_src->bip_idx;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_clone);
|
||||
|
||||
int bioset_integrity_create(struct bio_set *bs, int pool_size)
|
||||
{
|
||||
bs->bio_integrity_pool = mempool_create_slab_pool(pool_size,
|
||||
bio_integrity_slab);
|
||||
if (!bs->bio_integrity_pool)
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(bioset_integrity_create);
|
||||
|
||||
void bioset_integrity_free(struct bio_set *bs)
|
||||
{
|
||||
if (bs->bio_integrity_pool)
|
||||
mempool_destroy(bs->bio_integrity_pool);
|
||||
}
|
||||
EXPORT_SYMBOL(bioset_integrity_free);
|
||||
|
||||
void __init bio_integrity_init_slab(void)
|
||||
{
|
||||
bio_integrity_slab = KMEM_CACHE(bio_integrity_payload,
|
||||
SLAB_HWCACHE_ALIGN|SLAB_PANIC);
|
||||
}
|
||||
EXPORT_SYMBOL(bio_integrity_init_slab);
|
||||
|
||||
static int __init integrity_init(void)
|
||||
{
|
||||
kintegrityd_wq = create_workqueue("kintegrityd");
|
||||
|
||||
if (!kintegrityd_wq)
|
||||
panic("Failed to create kintegrityd\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
subsys_initcall(integrity_init);
|
||||
Loading…
Reference in a new issue