From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/block/bio-integrity.c | 517 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 517 insertions(+) create mode 100644 kernel/block/bio-integrity.c (limited to 'kernel/block/bio-integrity.c') diff --git a/kernel/block/bio-integrity.c b/kernel/block/bio-integrity.c new file mode 100644 index 000000000..5cbd5d9ea --- /dev/null +++ b/kernel/block/bio-integrity.c @@ -0,0 +1,517 @@ +/* + * bio-integrity.c - bio data integrity extensions + * + * Copyright (C) 2007, 2008, 2009 Oracle Corporation + * Written by: Martin K. Petersen + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + */ + +#include +#include +#include +#include +#include +#include + +#define BIP_INLINE_VECS 4 + +static struct kmem_cache *bip_slab; +static struct workqueue_struct *kintegrityd_wq; + +/** + * bio_integrity_alloc - Allocate integrity payload and attach it to bio + * @bio: bio to attach integrity metadata to + * @gfp_mask: Memory allocation mask + * @nr_vecs: Number of integrity metadata scatter-gather elements + * + * Description: This function prepares a bio for attaching integrity + * metadata. nr_vecs specifies the maximum number of pages containing + * integrity metadata that can be attached. + */ +struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, + gfp_t gfp_mask, + unsigned int nr_vecs) +{ + struct bio_integrity_payload *bip; + struct bio_set *bs = bio->bi_pool; + unsigned long idx = BIO_POOL_NONE; + unsigned inline_vecs; + + if (!bs) { + bip = kmalloc(sizeof(struct bio_integrity_payload) + + sizeof(struct bio_vec) * nr_vecs, gfp_mask); + inline_vecs = nr_vecs; + } else { + bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); + inline_vecs = BIP_INLINE_VECS; + } + + if (unlikely(!bip)) + return NULL; + + memset(bip, 0, sizeof(*bip)); + + if (nr_vecs > inline_vecs) { + bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx, + bs->bvec_integrity_pool); + if (!bip->bip_vec) + goto err; + bip->bip_max_vcnt = bvec_nr_vecs(idx); + } else { + bip->bip_vec = bip->bip_inline_vecs; + bip->bip_max_vcnt = inline_vecs; + } + + bip->bip_slab = idx; + bip->bip_bio = bio; + bio->bi_integrity = bip; + bio->bi_rw |= REQ_INTEGRITY; + + return bip; +err: + mempool_free(bip, bs->bio_integrity_pool); + return NULL; +} +EXPORT_SYMBOL(bio_integrity_alloc); + +/** + * bio_integrity_free - Free bio integrity payload + * @bio: bio containing bip to be freed + * + * Description: Used to free the integrity portion of a bio. Usually + * called from bio_free(). + */ +void bio_integrity_free(struct bio *bio) +{ + struct bio_integrity_payload *bip = bio_integrity(bio); + struct bio_set *bs = bio->bi_pool; + + if (bip->bip_flags & BIP_BLOCK_INTEGRITY) + kfree(page_address(bip->bip_vec->bv_page) + + bip->bip_vec->bv_offset); + + if (bs) { + if (bip->bip_slab != BIO_POOL_NONE) + bvec_free(bs->bvec_integrity_pool, bip->bip_vec, + bip->bip_slab); + + mempool_free(bip, bs->bio_integrity_pool); + } else { + kfree(bip); + } + + bio->bi_integrity = NULL; +} +EXPORT_SYMBOL(bio_integrity_free); + +/** + * bio_integrity_add_page - Attach integrity metadata + * @bio: bio to update + * @page: page containing integrity metadata + * @len: number of bytes of integrity metadata in page + * @offset: start offset within page + * + * Description: Attach a page containing integrity metadata to bio. + */ +int bio_integrity_add_page(struct bio *bio, struct page *page, + unsigned int len, unsigned int offset) +{ + struct bio_integrity_payload *bip = bio_integrity(bio); + struct bio_vec *iv; + + if (bip->bip_vcnt >= bip->bip_max_vcnt) { + printk(KERN_ERR "%s: bip_vec full\n", __func__); + return 0; + } + + iv = bip->bip_vec + bip->bip_vcnt; + + iv->bv_page = page; + iv->bv_len = len; + iv->bv_offset = offset; + bip->bip_vcnt++; + + return len; +} +EXPORT_SYMBOL(bio_integrity_add_page); + +/** + * bio_integrity_enabled - Check whether integrity can be passed + * @bio: bio to check + * + * Description: Determines whether bio_integrity_prep() can be called + * on this bio or not. bio data direction and target device must be + * set prior to calling. The functions honors the write_generate and + * read_verify flags in sysfs. + */ +bool bio_integrity_enabled(struct bio *bio) +{ + struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); + + if (!bio_is_rw(bio)) + return false; + + /* Already protected? */ + if (bio_integrity(bio)) + return false; + + if (bi == NULL) + return false; + + if (bio_data_dir(bio) == READ && bi->verify_fn != NULL && + (bi->flags & BLK_INTEGRITY_VERIFY)) + return true; + + if (bio_data_dir(bio) == WRITE && bi->generate_fn != NULL && + (bi->flags & BLK_INTEGRITY_GENERATE)) + return true; + + return false; +} +EXPORT_SYMBOL(bio_integrity_enabled); + +/** + * bio_integrity_intervals - Return number of integrity intervals for a bio + * @bi: blk_integrity profile for device + * @sectors: Size of the bio in 512-byte sectors + * + * Description: The block layer calculates everything in 512 byte + * sectors but integrity metadata is done in terms of the data integrity + * interval size of the storage device. Convert the block layer sectors + * to the appropriate number of integrity intervals. + */ +static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, + unsigned int sectors) +{ + return sectors >> (ilog2(bi->interval) - 9); +} + +static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, + unsigned int sectors) +{ + return bio_integrity_intervals(bi, sectors) * bi->tuple_size; +} + +/** + * bio_integrity_process - Process integrity metadata for a bio + * @bio: bio to generate/verify integrity metadata for + * @proc_fn: Pointer to the relevant processing function + */ +static int bio_integrity_process(struct bio *bio, + integrity_processing_fn *proc_fn) +{ + struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); + struct blk_integrity_iter iter; + struct bvec_iter bviter; + struct bio_vec bv; + struct bio_integrity_payload *bip = bio_integrity(bio); + unsigned int ret = 0; + void *prot_buf = page_address(bip->bip_vec->bv_page) + + bip->bip_vec->bv_offset; + + iter.disk_name = bio->bi_bdev->bd_disk->disk_name; + iter.interval = bi->interval; + iter.seed = bip_get_seed(bip); + iter.prot_buf = prot_buf; + + bio_for_each_segment(bv, bio, bviter) { + void *kaddr = kmap_atomic(bv.bv_page); + + iter.data_buf = kaddr + bv.bv_offset; + iter.data_size = bv.bv_len; + + ret = proc_fn(&iter); + if (ret) { + kunmap_atomic(kaddr); + return ret; + } + + kunmap_atomic(kaddr); + } + return ret; +} + +/** + * bio_integrity_prep - Prepare bio for integrity I/O + * @bio: bio to prepare + * + * Description: Allocates a buffer for integrity metadata, maps the + * pages and attaches them to a bio. The bio must have data + * direction, target device and start sector set priot to calling. In + * the WRITE case, integrity metadata will be generated using the + * block device's integrity function. In the READ case, the buffer + * will be prepared for DMA and a suitable end_io handler set up. + */ +int bio_integrity_prep(struct bio *bio) +{ + struct bio_integrity_payload *bip; + struct blk_integrity *bi; + struct request_queue *q; + void *buf; + unsigned long start, end; + unsigned int len, nr_pages; + unsigned int bytes, offset, i; + unsigned int intervals; + + bi = bdev_get_integrity(bio->bi_bdev); + q = bdev_get_queue(bio->bi_bdev); + BUG_ON(bi == NULL); + BUG_ON(bio_integrity(bio)); + + intervals = bio_integrity_intervals(bi, bio_sectors(bio)); + + /* Allocate kernel buffer for protection data */ + len = intervals * bi->tuple_size; + buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); + if (unlikely(buf == NULL)) { + printk(KERN_ERR "could not allocate integrity buffer\n"); + return -ENOMEM; + } + + end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; + start = ((unsigned long) buf) >> PAGE_SHIFT; + nr_pages = end - start; + + /* Allocate bio integrity payload and integrity vectors */ + bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); + if (unlikely(bip == NULL)) { + printk(KERN_ERR "could not allocate data integrity bioset\n"); + kfree(buf); + return -EIO; + } + + bip->bip_flags |= BIP_BLOCK_INTEGRITY; + bip->bip_iter.bi_size = len; + bip_set_seed(bip, bio->bi_iter.bi_sector); + + if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM) + bip->bip_flags |= BIP_IP_CHECKSUM; + + /* Map it */ + offset = offset_in_page(buf); + for (i = 0 ; i < nr_pages ; i++) { + int ret; + bytes = PAGE_SIZE - offset; + + if (len <= 0) + break; + + if (bytes > len) + bytes = len; + + ret = bio_integrity_add_page(bio, virt_to_page(buf), + bytes, offset); + + if (ret == 0) + return 0; + + if (ret < bytes) + break; + + buf += bytes; + len -= bytes; + offset = 0; + } + + /* Install custom I/O completion handler if read verify is enabled */ + if (bio_data_dir(bio) == READ) { + bip->bip_end_io = bio->bi_end_io; + bio->bi_end_io = bio_integrity_endio; + } + + /* Auto-generate integrity metadata if this is a write */ + if (bio_data_dir(bio) == WRITE) + bio_integrity_process(bio, bi->generate_fn); + + return 0; +} +EXPORT_SYMBOL(bio_integrity_prep); + +/** + * bio_integrity_verify_fn - Integrity I/O completion worker + * @work: Work struct stored in bio to be verified + * + * Description: This workqueue function is called to complete a READ + * request. The function verifies the transferred integrity metadata + * and then calls the original bio end_io function. + */ +static void bio_integrity_verify_fn(struct work_struct *work) +{ + struct bio_integrity_payload *bip = + container_of(work, struct bio_integrity_payload, bip_work); + struct bio *bio = bip->bip_bio; + struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); + int error; + + error = bio_integrity_process(bio, bi->verify_fn); + + /* 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_integrity(bio); + + 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_nodec(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_integrity(bio); + 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_integrity(bio); + 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_integrity(bio_src); + struct bio_integrity_payload *bip; + + BUG_ON(bip_src == NULL); + + bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); + + if (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(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); +} -- cgit 1.2.3-korg