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-----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABCAAGBQJawr05AAoJEPfTWPspceCmT2UP/1uuaqwzyl4VjFNb/k7KS7UM +Cs/1HBlGomgMA8orDTGqtWqLRdR3z4RSh0+MvXTzQ78HpFVYz7CbDc9itHm+G9M X0ypD4kF/JGCFb5cxk+x6qv28uO2nv4DP3+0hHqJWLH4UVJBWDY6bs4BPShsf9QB I6XjioNMhoqylXgdOITLODJZz+TcChlJMDAqwhpJwh9TH1wjobleAZ6AdmCPfgi5 h0UCKMUKzcVJlNZwQUrzrs2cxcx9Uhunnbz7HK0ZV4n/FKFtDpGynFpQQ71pZxKe Be0ZOBPCQvC3ykOM/egCIvC/e5y7FgrjORD6jxyu1PTwAugI5E1VYSMxHkXvgPAx zOo9A7RT4GPO2tDQv+DbzNFpqeSAclTgSmr+/y1wmheBs8DiSt7MPVBiNM4zdCNv NLk9z7IEjFhdmluSB/LbTb1aokypMb/q7QTLouPHdwGn80k7yrhFyLHgdjpNTQ2K UHfHZvGxkOX6SmFhBNOtIFUkuSceenh64a0RkRle7filx+ImpbCVm2/GYi9zZNCu EtctgzLbLmz40zMiyDaZS2bxBgGzfn6yf4xd9LsaAJPMhvZnmXogT0D9ctWXB0WU mMaS7sOkLnNjnGkzF1fHkeiZ/oigrstJbe+CA7BtOdwxpWn6MZBgKEoFQ6iA2b3X 5J1axMgVH5LAsIEcEQVq =RVhK -----END PGP SIGNATURE----- Merge tag 'for-4.17/block-20180402' of git://git.kernel.dk/linux-block Pull block layer updates from Jens Axboe: "It's a pretty quiet round this time, which is nice. This contains: - series from Bart, cleaning up the way we set/test/clear atomic queue flags. - series from Bart, fixing races between gendisk and queue registration and removal. - set of bcache fixes and improvements from various folks, by way of Michael Lyle. - set of lightnvm updates from Matias, most of it being the 1.2 to 2.0 transition. - removal of unused DIO flags from Nikolay. - blk-mq/sbitmap memory ordering fixes from Omar. - divide-by-zero fix for BFQ from Paolo. - minor documentation patches from Randy. - timeout fix from Tejun. - Alpha "can't write a char atomically" fix from Mikulas. - set of NVMe fixes by way of Keith. - bsg and bsg-lib improvements from Christoph. - a few sed-opal fixes from Jonas. - cdrom check-disk-change deadlock fix from Maurizio. - various little fixes, comment fixes, etc from various folks" * tag 'for-4.17/block-20180402' of git://git.kernel.dk/linux-block: (139 commits) blk-mq: Directly schedule q->timeout_work when aborting a request blktrace: fix comment in blktrace_api.h lightnvm: remove function name in strings lightnvm: pblk: remove some unnecessary NULL checks lightnvm: pblk: don't recover unwritten lines lightnvm: pblk: implement 2.0 support lightnvm: pblk: implement get log report chunk lightnvm: pblk: rename ppaf* to addrf* lightnvm: pblk: check for supported version lightnvm: implement get log report chunk helpers lightnvm: make address conversions depend on generic device lightnvm: add support for 2.0 address format lightnvm: normalize geometry nomenclature lightnvm: complete geo structure with maxoc* lightnvm: add shorten OCSSD version in geo lightnvm: add minor version to generic geometry lightnvm: simplify geometry structure lightnvm: pblk: refactor init/exit sequences lightnvm: Avoid validation of default op value lightnvm: centralize permission check for lightnvm ioctl ...
351 lines
8.7 KiB
C
351 lines
8.7 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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static u32 nsblk_meta_size(struct nd_namespace_blk *nsblk)
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{
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return nsblk->lbasize - ((nsblk->lbasize >= 4096) ? 4096 : 512);
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}
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static u32 nsblk_internal_lbasize(struct nd_namespace_blk *nsblk)
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{
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return roundup(nsblk->lbasize, INT_LBASIZE_ALIGNMENT);
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}
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static u32 nsblk_sector_size(struct nd_namespace_blk *nsblk)
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{
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return nsblk->lbasize - nsblk_meta_size(nsblk);
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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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static struct nd_blk_region *to_ndbr(struct nd_namespace_blk *nsblk)
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{
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struct nd_region *nd_region;
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struct device *parent;
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parent = nsblk->common.dev.parent;
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nd_region = container_of(parent, struct nd_region, dev);
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return container_of(nd_region, struct nd_blk_region, nd_region);
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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_namespace_blk *nsblk,
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struct bio_integrity_payload *bip, u64 lba, int rw)
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{
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struct nd_blk_region *ndbr = to_ndbr(nsblk);
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unsigned int len = nsblk_meta_size(nsblk);
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resource_size_t dev_offset, ns_offset;
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u32 internal_lbasize, sector_size;
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int err = 0;
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internal_lbasize = nsblk_internal_lbasize(nsblk);
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sector_size = nsblk_sector_size(nsblk);
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ns_offset = lba * internal_lbasize + 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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if (!bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len))
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return -EIO;
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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_namespace_blk *nsblk,
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struct bio_integrity_payload *bip, u64 lba, 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 nsblk_do_bvec(struct nd_namespace_blk *nsblk,
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struct bio_integrity_payload *bip, struct page *page,
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unsigned int len, unsigned int off, int rw, sector_t sector)
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{
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struct nd_blk_region *ndbr = to_ndbr(nsblk);
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resource_size_t dev_offset, ns_offset;
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u32 internal_lbasize, sector_size;
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int err = 0;
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void *iobuf;
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u64 lba;
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internal_lbasize = nsblk_internal_lbasize(nsblk);
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sector_size = nsblk_sector_size(nsblk);
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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, sector_size) : len;
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lba = div_u64(sector << SECTOR_SHIFT, sector_size);
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ns_offset = lba * internal_lbasize;
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dev_offset = to_dev_offset(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(nsblk, 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 += 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 bio_integrity_payload *bip;
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struct nd_namespace_blk *nsblk;
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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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if (!bio_integrity_prep(bio))
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return BLK_QC_T_NONE;
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bip = bio_integrity(bio);
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nsblk = q->queuedata;
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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 = nsblk_do_bvec(nsblk, 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_dbg(&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_status = errno_to_blk_status(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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bio_endio(bio);
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return BLK_QC_T_NONE;
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}
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static int nsblk_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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unsigned long flags)
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{
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struct nd_namespace_blk *nsblk = to_nd_namespace_blk(&ndns->dev);
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struct nd_blk_region *ndbr = to_ndbr(nsblk);
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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 > nsblk->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 void nd_blk_release_queue(void *q)
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{
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blk_cleanup_queue(q);
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}
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static void nd_blk_release_disk(void *disk)
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{
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del_gendisk(disk);
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put_disk(disk);
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}
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static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
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{
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struct device *dev = &nsblk->common.dev;
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resource_size_t available_disk_size;
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struct request_queue *q;
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struct gendisk *disk;
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u64 internal_nlba;
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internal_nlba = div_u64(nsblk->size, nsblk_internal_lbasize(nsblk));
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available_disk_size = internal_nlba * nsblk_sector_size(nsblk);
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q = blk_alloc_queue(GFP_KERNEL);
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if (!q)
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return -ENOMEM;
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if (devm_add_action_or_reset(dev, nd_blk_release_queue, q))
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return -ENOMEM;
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blk_queue_make_request(q, nd_blk_make_request);
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blk_queue_max_hw_sectors(q, UINT_MAX);
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blk_queue_logical_block_size(q, nsblk_sector_size(nsblk));
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blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
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q->queuedata = nsblk;
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disk = alloc_disk(0);
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if (!disk)
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return -ENOMEM;
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disk->first_minor = 0;
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disk->fops = &nd_blk_fops;
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disk->queue = q;
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disk->flags = GENHD_FL_EXT_DEVT;
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nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name);
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if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk))
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return -ENOMEM;
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if (nsblk_meta_size(nsblk)) {
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int rc = nd_integrity_init(disk, nsblk_meta_size(nsblk));
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if (rc)
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return rc;
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}
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set_capacity(disk, available_disk_size >> SECTOR_SHIFT);
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device_add_disk(dev, disk);
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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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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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nsblk = to_nd_namespace_blk(&ndns->dev);
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nsblk->size = nvdimm_namespace_capacity(ndns);
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dev_set_drvdata(dev, nsblk);
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ndns->rw_bytes = nsblk_rw_bytes;
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if (is_nd_btt(dev))
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return nvdimm_namespace_attach_btt(ndns);
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else if (nd_btt_probe(dev, ndns) == 0) {
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/* we'll come back as btt-blk */
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return -ENXIO;
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} else
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return nsblk_attach_disk(nsblk);
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}
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static int nd_blk_remove(struct device *dev)
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{
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if (is_nd_btt(dev))
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nvdimm_namespace_detach_btt(to_nd_btt(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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return nd_driver_register(&nd_blk_driver);
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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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}
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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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