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![Jens Axboe](/assets/img/avatar_default.png)
No functional changes in this patch, but it prepares us for returning a more useful cookie related to the IO that was queued up. Signed-off-by: Jens Axboe <axboe@fb.com> Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Keith Busch <keith.busch@intel.com>
386 lines
9.6 KiB
C
386 lines
9.6 KiB
C
/*
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* NVDIMM Block Window Driver
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/blkdev.h>
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#include <linux/fs.h>
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#include <linux/genhd.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/nd.h>
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#include <linux/sizes.h>
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#include "nd.h"
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struct nd_blk_device {
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struct request_queue *queue;
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struct gendisk *disk;
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struct nd_namespace_blk *nsblk;
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struct nd_blk_region *ndbr;
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size_t disk_size;
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u32 sector_size;
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u32 internal_lbasize;
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};
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static int nd_blk_major;
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static u32 nd_blk_meta_size(struct nd_blk_device *blk_dev)
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{
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return blk_dev->nsblk->lbasize - blk_dev->sector_size;
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}
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static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk,
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resource_size_t ns_offset, unsigned int len)
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{
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int i;
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for (i = 0; i < nsblk->num_resources; i++) {
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if (ns_offset < resource_size(nsblk->res[i])) {
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if (ns_offset + len > resource_size(nsblk->res[i])) {
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dev_WARN_ONCE(&nsblk->common.dev, 1,
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"illegal request\n");
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return SIZE_MAX;
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}
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return nsblk->res[i]->start + ns_offset;
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}
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ns_offset -= resource_size(nsblk->res[i]);
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}
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dev_WARN_ONCE(&nsblk->common.dev, 1, "request out of range\n");
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return SIZE_MAX;
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}
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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static int nd_blk_rw_integrity(struct nd_blk_device *blk_dev,
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struct bio_integrity_payload *bip, u64 lba,
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int rw)
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{
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unsigned int len = nd_blk_meta_size(blk_dev);
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resource_size_t dev_offset, ns_offset;
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struct nd_namespace_blk *nsblk;
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struct nd_blk_region *ndbr;
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int err = 0;
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nsblk = blk_dev->nsblk;
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ndbr = blk_dev->ndbr;
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ns_offset = lba * blk_dev->internal_lbasize + blk_dev->sector_size;
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dev_offset = to_dev_offset(nsblk, ns_offset, len);
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if (dev_offset == SIZE_MAX)
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return -EIO;
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while (len) {
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unsigned int cur_len;
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struct bio_vec bv;
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void *iobuf;
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bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
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/*
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* The 'bv' obtained from bvec_iter_bvec has its .bv_len and
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* .bv_offset already adjusted for iter->bi_bvec_done, and we
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* can use those directly
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*/
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cur_len = min(len, bv.bv_len);
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iobuf = kmap_atomic(bv.bv_page);
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err = ndbr->do_io(ndbr, dev_offset, iobuf + bv.bv_offset,
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cur_len, rw);
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kunmap_atomic(iobuf);
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if (err)
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return err;
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len -= cur_len;
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dev_offset += cur_len;
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bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len);
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}
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return err;
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}
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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static int nd_blk_rw_integrity(struct nd_blk_device *blk_dev,
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struct bio_integrity_payload *bip, u64 lba,
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int rw)
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{
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return 0;
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}
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#endif
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static int nd_blk_do_bvec(struct nd_blk_device *blk_dev,
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struct bio_integrity_payload *bip, struct page *page,
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unsigned int len, unsigned int off, int rw,
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sector_t sector)
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{
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struct nd_blk_region *ndbr = blk_dev->ndbr;
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resource_size_t dev_offset, ns_offset;
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int err = 0;
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void *iobuf;
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u64 lba;
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while (len) {
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unsigned int cur_len;
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/*
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* If we don't have an integrity payload, we don't have to
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* split the bvec into sectors, as this would cause unnecessary
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* Block Window setup/move steps. the do_io routine is capable
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* of handling len <= PAGE_SIZE.
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*/
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cur_len = bip ? min(len, blk_dev->sector_size) : len;
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lba = div_u64(sector << SECTOR_SHIFT, blk_dev->sector_size);
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ns_offset = lba * blk_dev->internal_lbasize;
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dev_offset = to_dev_offset(blk_dev->nsblk, ns_offset, cur_len);
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if (dev_offset == SIZE_MAX)
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return -EIO;
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iobuf = kmap_atomic(page);
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err = ndbr->do_io(ndbr, dev_offset, iobuf + off, cur_len, rw);
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kunmap_atomic(iobuf);
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if (err)
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return err;
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if (bip) {
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err = nd_blk_rw_integrity(blk_dev, bip, lba, rw);
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if (err)
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return err;
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}
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len -= cur_len;
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off += cur_len;
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sector += blk_dev->sector_size >> SECTOR_SHIFT;
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}
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return err;
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}
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static blk_qc_t nd_blk_make_request(struct request_queue *q, struct bio *bio)
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{
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struct block_device *bdev = bio->bi_bdev;
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struct gendisk *disk = bdev->bd_disk;
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struct bio_integrity_payload *bip;
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struct nd_blk_device *blk_dev;
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struct bvec_iter iter;
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unsigned long start;
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struct bio_vec bvec;
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int err = 0, rw;
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bool do_acct;
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/*
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* bio_integrity_enabled also checks if the bio already has an
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* integrity payload attached. If it does, we *don't* do a
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* bio_integrity_prep here - the payload has been generated by
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* another kernel subsystem, and we just pass it through.
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*/
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if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
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bio->bi_error = -EIO;
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goto out;
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}
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bip = bio_integrity(bio);
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blk_dev = disk->private_data;
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rw = bio_data_dir(bio);
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do_acct = nd_iostat_start(bio, &start);
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bio_for_each_segment(bvec, bio, iter) {
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unsigned int len = bvec.bv_len;
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BUG_ON(len > PAGE_SIZE);
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err = nd_blk_do_bvec(blk_dev, bip, bvec.bv_page, len,
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bvec.bv_offset, rw, iter.bi_sector);
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if (err) {
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dev_info(&blk_dev->nsblk->common.dev,
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"io error in %s sector %lld, len %d,\n",
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(rw == READ) ? "READ" : "WRITE",
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(unsigned long long) iter.bi_sector, len);
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bio->bi_error = err;
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break;
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}
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}
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if (do_acct)
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nd_iostat_end(bio, start);
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out:
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bio_endio(bio);
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return BLK_QC_T_NONE;
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}
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static int nd_blk_rw_bytes(struct nd_namespace_common *ndns,
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resource_size_t offset, void *iobuf, size_t n, int rw)
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{
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struct nd_blk_device *blk_dev = dev_get_drvdata(ndns->claim);
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struct nd_namespace_blk *nsblk = blk_dev->nsblk;
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struct nd_blk_region *ndbr = blk_dev->ndbr;
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resource_size_t dev_offset;
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dev_offset = to_dev_offset(nsblk, offset, n);
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if (unlikely(offset + n > blk_dev->disk_size)) {
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dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
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return -EFAULT;
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}
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if (dev_offset == SIZE_MAX)
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return -EIO;
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return ndbr->do_io(ndbr, dev_offset, iobuf, n, rw);
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}
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static const struct block_device_operations nd_blk_fops = {
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.owner = THIS_MODULE,
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.revalidate_disk = nvdimm_revalidate_disk,
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};
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static int nd_blk_attach_disk(struct nd_namespace_common *ndns,
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struct nd_blk_device *blk_dev)
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{
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resource_size_t available_disk_size;
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struct gendisk *disk;
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u64 internal_nlba;
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internal_nlba = div_u64(blk_dev->disk_size, blk_dev->internal_lbasize);
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available_disk_size = internal_nlba * blk_dev->sector_size;
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blk_dev->queue = blk_alloc_queue(GFP_KERNEL);
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if (!blk_dev->queue)
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return -ENOMEM;
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blk_queue_make_request(blk_dev->queue, nd_blk_make_request);
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blk_queue_max_hw_sectors(blk_dev->queue, UINT_MAX);
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blk_queue_bounce_limit(blk_dev->queue, BLK_BOUNCE_ANY);
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blk_queue_logical_block_size(blk_dev->queue, blk_dev->sector_size);
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queue_flag_set_unlocked(QUEUE_FLAG_NONROT, blk_dev->queue);
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disk = blk_dev->disk = alloc_disk(0);
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if (!disk) {
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blk_cleanup_queue(blk_dev->queue);
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return -ENOMEM;
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}
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disk->driverfs_dev = &ndns->dev;
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disk->major = nd_blk_major;
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disk->first_minor = 0;
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disk->fops = &nd_blk_fops;
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disk->private_data = blk_dev;
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disk->queue = blk_dev->queue;
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disk->flags = GENHD_FL_EXT_DEVT;
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nvdimm_namespace_disk_name(ndns, disk->disk_name);
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set_capacity(disk, 0);
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add_disk(disk);
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if (nd_blk_meta_size(blk_dev)) {
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int rc = nd_integrity_init(disk, nd_blk_meta_size(blk_dev));
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if (rc) {
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del_gendisk(disk);
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put_disk(disk);
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blk_cleanup_queue(blk_dev->queue);
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return rc;
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}
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}
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set_capacity(disk, available_disk_size >> SECTOR_SHIFT);
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revalidate_disk(disk);
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return 0;
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}
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static int nd_blk_probe(struct device *dev)
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{
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struct nd_namespace_common *ndns;
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struct nd_namespace_blk *nsblk;
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struct nd_blk_device *blk_dev;
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int rc;
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ndns = nvdimm_namespace_common_probe(dev);
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if (IS_ERR(ndns))
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return PTR_ERR(ndns);
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blk_dev = kzalloc(sizeof(*blk_dev), GFP_KERNEL);
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if (!blk_dev)
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return -ENOMEM;
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nsblk = to_nd_namespace_blk(&ndns->dev);
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blk_dev->disk_size = nvdimm_namespace_capacity(ndns);
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blk_dev->ndbr = to_nd_blk_region(dev->parent);
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blk_dev->nsblk = to_nd_namespace_blk(&ndns->dev);
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blk_dev->internal_lbasize = roundup(nsblk->lbasize,
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INT_LBASIZE_ALIGNMENT);
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blk_dev->sector_size = ((nsblk->lbasize >= 4096) ? 4096 : 512);
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dev_set_drvdata(dev, blk_dev);
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ndns->rw_bytes = nd_blk_rw_bytes;
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if (is_nd_btt(dev))
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rc = nvdimm_namespace_attach_btt(ndns);
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else if (nd_btt_probe(ndns, blk_dev) == 0) {
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/* we'll come back as btt-blk */
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rc = -ENXIO;
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} else
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rc = nd_blk_attach_disk(ndns, blk_dev);
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if (rc)
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kfree(blk_dev);
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return rc;
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}
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static void nd_blk_detach_disk(struct nd_blk_device *blk_dev)
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{
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del_gendisk(blk_dev->disk);
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put_disk(blk_dev->disk);
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blk_cleanup_queue(blk_dev->queue);
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}
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static int nd_blk_remove(struct device *dev)
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{
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struct nd_blk_device *blk_dev = dev_get_drvdata(dev);
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if (is_nd_btt(dev))
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nvdimm_namespace_detach_btt(to_nd_btt(dev)->ndns);
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else
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nd_blk_detach_disk(blk_dev);
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kfree(blk_dev);
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return 0;
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}
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static struct nd_device_driver nd_blk_driver = {
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.probe = nd_blk_probe,
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.remove = nd_blk_remove,
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.drv = {
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.name = "nd_blk",
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},
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.type = ND_DRIVER_NAMESPACE_BLK,
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};
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static int __init nd_blk_init(void)
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{
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int rc;
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rc = register_blkdev(0, "nd_blk");
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if (rc < 0)
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return rc;
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nd_blk_major = rc;
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rc = nd_driver_register(&nd_blk_driver);
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if (rc < 0)
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unregister_blkdev(nd_blk_major, "nd_blk");
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return rc;
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}
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static void __exit nd_blk_exit(void)
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{
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driver_unregister(&nd_blk_driver.drv);
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unregister_blkdev(nd_blk_major, "nd_blk");
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}
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MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_BLK);
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module_init(nd_blk_init);
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module_exit(nd_blk_exit);
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