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0b4ef8de09
Mark functions as static in bio-integrity.c because it is not used outside this file. This eliminates the following warnings in bio-integrity.c: fs/bio-integrity.c:224:5: warning: no previous prototype for ‘bio_integrity_tag’ [-Wmissing-prototypes] Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Jens Axboe <axboe@fb.com>
671 lines
18 KiB
C
671 lines
18 KiB
C
/*
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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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* 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/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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#define BIP_INLINE_VECS 4
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static struct kmem_cache *bip_slab;
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static struct workqueue_struct *kintegrityd_wq;
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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 long idx = BIO_POOL_NONE;
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unsigned inline_vecs;
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if (!bs) {
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bip = kmalloc(sizeof(struct bio_integrity_payload) +
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sizeof(struct bio_vec) * 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 = BIP_INLINE_VECS;
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}
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if (unlikely(!bip))
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return NULL;
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memset(bip, 0, sizeof(*bip));
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if (nr_vecs > inline_vecs) {
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bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx,
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bs->bvec_integrity_pool);
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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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}
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bip->bip_slab = idx;
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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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err:
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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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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->bi_integrity;
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struct bio_set *bs = bio->bi_pool;
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if (bip->bip_owns_buf)
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kfree(bip->bip_buf);
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if (bs) {
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if (bip->bip_slab != BIO_POOL_NONE)
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bvec_free(bs->bvec_integrity_pool, bip->bip_vec,
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bip->bip_slab);
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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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bio->bi_integrity = NULL;
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}
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EXPORT_SYMBOL(bio_integrity_free);
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static inline unsigned int bip_integrity_vecs(struct bio_integrity_payload *bip)
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{
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if (bip->bip_slab == BIO_POOL_NONE)
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return BIP_INLINE_VECS;
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return bvec_nr_vecs(bip->bip_slab);
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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->bi_integrity;
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struct bio_vec *iv;
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if (bip->bip_vcnt >= bip_integrity_vecs(bip)) {
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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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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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static int bdev_integrity_enabled(struct block_device *bdev, int rw)
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{
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struct blk_integrity *bi = bdev_get_integrity(bdev);
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if (bi == NULL)
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return 0;
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if (rw == READ && bi->verify_fn != NULL &&
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(bi->flags & INTEGRITY_FLAG_READ))
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return 1;
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if (rw == WRITE && bi->generate_fn != NULL &&
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(bi->flags & INTEGRITY_FLAG_WRITE))
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return 1;
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return 0;
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}
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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,
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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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static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
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unsigned int sectors)
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{
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return bio_integrity_hw_sectors(bi, sectors) * bi->tuple_size;
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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_iter.bi_size == 0);
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return bi->tag_size * (bio->bi_iter.bi_size / bi->sector_size);
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}
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EXPORT_SYMBOL(bio_integrity_tag_size);
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static int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len,
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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,
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DIV_ROUND_UP(len, bi->tag_size));
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if (nr_sectors * bi->tuple_size > bip->bip_iter.bi_size) {
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printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", __func__,
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nr_sectors * bi->tuple_size, bip->bip_iter.bi_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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struct bvec_iter iter;
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sector_t sector = bio->bi_iter.bi_sector;
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unsigned int 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, iter) {
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void *kaddr = kmap_atomic(bv.bv_page);
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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_iter.bi_size);
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kunmap_atomic(kaddr);
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}
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}
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static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi)
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{
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if (bi)
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return bi->tuple_size;
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return 0;
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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 | 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 -ENOMEM;
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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_owns_buf = 1;
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bip->bip_buf = buf;
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bip->bip_iter.bi_size = len;
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bip->bip_iter.bi_sector = bio->bi_iter.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_iter.bi_sector;
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unsigned int sectors, total, ret;
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void *prot_buf = bio->bi_integrity->bip_buf;
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int i;
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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_all(bv, bio, i) {
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void *kaddr = kmap_atomic(bv->bv_page);
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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);
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return ret;
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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_iter.bi_size);
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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_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;
|
|
|
|
error = bio_integrity_verify(bio);
|
|
|
|
/* Restore original bio completion handler */
|
|
bio->bi_end_io = bip->bip_end_io;
|
|
bio_endio_nodec(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);
|
|
|
|
/* In case of an I/O error there is no point in verifying the
|
|
* integrity metadata. Restore original bio end_io handler
|
|
* and run it.
|
|
*/
|
|
if (error) {
|
|
bio->bi_end_io = bip->bip_end_io;
|
|
bio_endio(bio, error);
|
|
|
|
return;
|
|
}
|
|
|
|
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
|
|
queue_work(kintegrityd_wq, &bip->bip_work);
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_endio);
|
|
|
|
/**
|
|
* 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 bytes = bio_integrity_bytes(bi, bytes_done >> 9);
|
|
|
|
bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes);
|
|
}
|
|
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);
|
|
|
|
bio_integrity_advance(bio, offset << 9);
|
|
bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors);
|
|
}
|
|
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_src->bi_integrity;
|
|
struct bio_integrity_payload *bip;
|
|
|
|
BUG_ON(bip_src == NULL);
|
|
|
|
bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
|
|
|
|
if (bip == NULL)
|
|
return -EIO;
|
|
|
|
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;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bio_integrity_clone);
|
|
|
|
int bioset_integrity_create(struct bio_set *bs, int pool_size)
|
|
{
|
|
if (bs->bio_integrity_pool)
|
|
return 0;
|
|
|
|
bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab);
|
|
if (!bs->bio_integrity_pool)
|
|
return -1;
|
|
|
|
bs->bvec_integrity_pool = biovec_create_pool(bs, pool_size);
|
|
if (!bs->bvec_integrity_pool) {
|
|
mempool_destroy(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);
|
|
|
|
if (bs->bvec_integrity_pool)
|
|
mempool_destroy(bs->bvec_integrity_pool);
|
|
}
|
|
EXPORT_SYMBOL(bioset_integrity_free);
|
|
|
|
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) * BIP_INLINE_VECS,
|
|
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
|
|
if (!bip_slab)
|
|
panic("Failed to create slab\n");
|
|
}
|