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![Christoph Hellwig](/assets/img/avatar_default.png)
generic_make_request has always been very confusingly misnamed, so rename it to submit_bio_noacct to make it clear that it is submit_bio minus accounting and a few checks. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
474 lines
12 KiB
C
474 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016 CNEX Labs
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* Initial release: Javier Gonzalez <javier@cnexlabs.com>
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* Matias Bjorling <matias@cnexlabs.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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* pblk-read.c - pblk's read path
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*/
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#include "pblk.h"
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/*
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* There is no guarantee that the value read from cache has not been updated and
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* resides at another location in the cache. We guarantee though that if the
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* value is read from the cache, it belongs to the mapped lba. In order to
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* guarantee and order between writes and reads are ordered, a flush must be
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* issued.
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*/
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static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio,
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sector_t lba, struct ppa_addr ppa)
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{
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#ifdef CONFIG_NVM_PBLK_DEBUG
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/* Callers must ensure that the ppa points to a cache address */
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BUG_ON(pblk_ppa_empty(ppa));
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BUG_ON(!pblk_addr_in_cache(ppa));
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#endif
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return pblk_rb_copy_to_bio(&pblk->rwb, bio, lba, ppa);
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}
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static int pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
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struct bio *bio, sector_t blba,
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bool *from_cache)
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{
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void *meta_list = rqd->meta_list;
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int nr_secs, i;
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retry:
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nr_secs = pblk_lookup_l2p_seq(pblk, rqd->ppa_list, blba, rqd->nr_ppas,
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from_cache);
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if (!*from_cache)
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goto end;
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for (i = 0; i < nr_secs; i++) {
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struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i);
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sector_t lba = blba + i;
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if (pblk_ppa_empty(rqd->ppa_list[i])) {
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__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
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meta->lba = addr_empty;
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} else if (pblk_addr_in_cache(rqd->ppa_list[i])) {
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/*
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* Try to read from write buffer. The address is later
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* checked on the write buffer to prevent retrieving
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* overwritten data.
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*/
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if (!pblk_read_from_cache(pblk, bio, lba,
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rqd->ppa_list[i])) {
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if (i == 0) {
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/*
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* We didn't call with bio_advance()
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* yet, so we can just retry.
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*/
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goto retry;
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} else {
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/*
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* We already call bio_advance()
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* so we cannot retry and we need
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* to quit that function in order
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* to allow caller to handle the bio
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* splitting in the current sector
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* position.
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*/
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nr_secs = i;
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goto end;
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}
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}
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meta->lba = cpu_to_le64(lba);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_inc(&pblk->cache_reads);
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#endif
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}
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bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
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}
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end:
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if (pblk_io_aligned(pblk, nr_secs))
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rqd->is_seq = 1;
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_add(nr_secs, &pblk->inflight_reads);
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#endif
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return nr_secs;
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}
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static void pblk_read_check_seq(struct pblk *pblk, struct nvm_rq *rqd,
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sector_t blba)
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{
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void *meta_list = rqd->meta_list;
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int nr_lbas = rqd->nr_ppas;
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int i;
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if (!pblk_is_oob_meta_supported(pblk))
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return;
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for (i = 0; i < nr_lbas; i++) {
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struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i);
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u64 lba = le64_to_cpu(meta->lba);
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if (lba == ADDR_EMPTY)
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continue;
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if (lba != blba + i) {
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#ifdef CONFIG_NVM_PBLK_DEBUG
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struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
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print_ppa(pblk, &ppa_list[i], "seq", i);
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#endif
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pblk_err(pblk, "corrupted read LBA (%llu/%llu)\n",
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lba, (u64)blba + i);
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WARN_ON(1);
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}
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}
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}
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/*
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* There can be holes in the lba list.
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*/
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static void pblk_read_check_rand(struct pblk *pblk, struct nvm_rq *rqd,
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u64 *lba_list, int nr_lbas)
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{
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void *meta_lba_list = rqd->meta_list;
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int i, j;
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if (!pblk_is_oob_meta_supported(pblk))
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return;
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for (i = 0, j = 0; i < nr_lbas; i++) {
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struct pblk_sec_meta *meta = pblk_get_meta(pblk,
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meta_lba_list, j);
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u64 lba = lba_list[i];
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u64 meta_lba;
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if (lba == ADDR_EMPTY)
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continue;
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meta_lba = le64_to_cpu(meta->lba);
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if (lba != meta_lba) {
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#ifdef CONFIG_NVM_PBLK_DEBUG
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struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
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print_ppa(pblk, &ppa_list[j], "rnd", j);
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#endif
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pblk_err(pblk, "corrupted read LBA (%llu/%llu)\n",
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meta_lba, lba);
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WARN_ON(1);
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}
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j++;
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}
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WARN_ONCE(j != rqd->nr_ppas, "pblk: corrupted random request\n");
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}
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static void pblk_end_user_read(struct bio *bio, int error)
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{
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if (error && error != NVM_RSP_WARN_HIGHECC)
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bio_io_error(bio);
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else
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bio_endio(bio);
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}
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static void __pblk_end_io_read(struct pblk *pblk, struct nvm_rq *rqd,
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bool put_line)
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{
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struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
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struct bio *int_bio = rqd->bio;
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unsigned long start_time = r_ctx->start_time;
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bio_end_io_acct(int_bio, start_time);
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if (rqd->error)
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pblk_log_read_err(pblk, rqd);
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pblk_read_check_seq(pblk, rqd, r_ctx->lba);
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bio_put(int_bio);
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if (put_line)
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pblk_rq_to_line_put(pblk, rqd);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_add(rqd->nr_ppas, &pblk->sync_reads);
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atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads);
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#endif
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pblk_free_rqd(pblk, rqd, PBLK_READ);
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atomic_dec(&pblk->inflight_io);
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}
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static void pblk_end_io_read(struct nvm_rq *rqd)
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{
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struct pblk *pblk = rqd->private;
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struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
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struct bio *bio = (struct bio *)r_ctx->private;
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pblk_end_user_read(bio, rqd->error);
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__pblk_end_io_read(pblk, rqd, true);
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}
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static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, struct bio *bio,
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sector_t lba, bool *from_cache)
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{
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struct pblk_sec_meta *meta = pblk_get_meta(pblk, rqd->meta_list, 0);
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struct ppa_addr ppa;
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pblk_lookup_l2p_seq(pblk, &ppa, lba, 1, from_cache);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_inc(&pblk->inflight_reads);
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#endif
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retry:
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if (pblk_ppa_empty(ppa)) {
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__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
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meta->lba = addr_empty;
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return;
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}
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/* Try to read from write buffer. The address is later checked on the
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* write buffer to prevent retrieving overwritten data.
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*/
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if (pblk_addr_in_cache(ppa)) {
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if (!pblk_read_from_cache(pblk, bio, lba, ppa)) {
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pblk_lookup_l2p_seq(pblk, &ppa, lba, 1, from_cache);
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goto retry;
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}
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meta->lba = cpu_to_le64(lba);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_inc(&pblk->cache_reads);
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#endif
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} else {
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rqd->ppa_addr = ppa;
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}
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}
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void pblk_submit_read(struct pblk *pblk, struct bio *bio)
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{
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sector_t blba = pblk_get_lba(bio);
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unsigned int nr_secs = pblk_get_secs(bio);
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bool from_cache;
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struct pblk_g_ctx *r_ctx;
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struct nvm_rq *rqd;
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struct bio *int_bio, *split_bio;
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unsigned long start_time;
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start_time = bio_start_io_acct(bio);
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rqd = pblk_alloc_rqd(pblk, PBLK_READ);
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rqd->opcode = NVM_OP_PREAD;
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rqd->nr_ppas = nr_secs;
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rqd->private = pblk;
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rqd->end_io = pblk_end_io_read;
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r_ctx = nvm_rq_to_pdu(rqd);
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r_ctx->start_time = start_time;
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r_ctx->lba = blba;
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if (pblk_alloc_rqd_meta(pblk, rqd)) {
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bio_io_error(bio);
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pblk_free_rqd(pblk, rqd, PBLK_READ);
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return;
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}
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/* Clone read bio to deal internally with:
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* -read errors when reading from drive
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* -bio_advance() calls during cache reads
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*/
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int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
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if (nr_secs > 1)
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nr_secs = pblk_read_ppalist_rq(pblk, rqd, int_bio, blba,
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&from_cache);
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else
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pblk_read_rq(pblk, rqd, int_bio, blba, &from_cache);
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split_retry:
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r_ctx->private = bio; /* original bio */
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rqd->bio = int_bio; /* internal bio */
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if (from_cache && nr_secs == rqd->nr_ppas) {
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/* All data was read from cache, we can complete the IO. */
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pblk_end_user_read(bio, 0);
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atomic_inc(&pblk->inflight_io);
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__pblk_end_io_read(pblk, rqd, false);
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} else if (nr_secs != rqd->nr_ppas) {
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/* The read bio request could be partially filled by the write
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* buffer, but there are some holes that need to be read from
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* the drive. In order to handle this, we will use block layer
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* mechanism to split this request in to smaller ones and make
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* a chain of it.
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*/
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split_bio = bio_split(bio, nr_secs * NR_PHY_IN_LOG, GFP_KERNEL,
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&pblk_bio_set);
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bio_chain(split_bio, bio);
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submit_bio_noacct(bio);
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/* New bio contains first N sectors of the previous one, so
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* we can continue to use existing rqd, but we need to shrink
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* the number of PPAs in it. New bio is also guaranteed that
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* it contains only either data from cache or from drive, newer
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* mix of them.
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*/
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bio = split_bio;
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rqd->nr_ppas = nr_secs;
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if (rqd->nr_ppas == 1)
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rqd->ppa_addr = rqd->ppa_list[0];
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/* Recreate int_bio - existing might have some needed internal
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* fields modified already.
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*/
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bio_put(int_bio);
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int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
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goto split_retry;
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} else if (pblk_submit_io(pblk, rqd, NULL)) {
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/* Submitting IO to drive failed, let's report an error */
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rqd->error = -ENODEV;
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pblk_end_io_read(rqd);
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}
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}
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static int read_ppalist_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
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struct pblk_line *line, u64 *lba_list,
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u64 *paddr_list_gc, unsigned int nr_secs)
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{
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struct ppa_addr ppa_list_l2p[NVM_MAX_VLBA];
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struct ppa_addr ppa_gc;
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int valid_secs = 0;
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int i;
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pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs);
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for (i = 0; i < nr_secs; i++) {
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if (lba_list[i] == ADDR_EMPTY)
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continue;
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ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id);
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if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) {
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paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY;
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continue;
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}
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rqd->ppa_list[valid_secs++] = ppa_list_l2p[i];
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}
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_add(valid_secs, &pblk->inflight_reads);
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#endif
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return valid_secs;
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}
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static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
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struct pblk_line *line, sector_t lba,
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u64 paddr_gc)
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{
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struct ppa_addr ppa_l2p, ppa_gc;
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int valid_secs = 0;
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if (lba == ADDR_EMPTY)
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goto out;
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/* logic error: lba out-of-bounds */
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if (lba >= pblk->capacity) {
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WARN(1, "pblk: read lba out of bounds\n");
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goto out;
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}
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spin_lock(&pblk->trans_lock);
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ppa_l2p = pblk_trans_map_get(pblk, lba);
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spin_unlock(&pblk->trans_lock);
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ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id);
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if (!pblk_ppa_comp(ppa_l2p, ppa_gc))
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goto out;
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rqd->ppa_addr = ppa_l2p;
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valid_secs = 1;
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_inc(&pblk->inflight_reads);
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#endif
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out:
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return valid_secs;
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}
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int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
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{
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struct nvm_rq rqd;
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int ret = NVM_IO_OK;
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memset(&rqd, 0, sizeof(struct nvm_rq));
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ret = pblk_alloc_rqd_meta(pblk, &rqd);
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if (ret)
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return ret;
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if (gc_rq->nr_secs > 1) {
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gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line,
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gc_rq->lba_list,
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gc_rq->paddr_list,
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gc_rq->nr_secs);
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if (gc_rq->secs_to_gc == 1)
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rqd.ppa_addr = rqd.ppa_list[0];
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} else {
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gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line,
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gc_rq->lba_list[0],
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gc_rq->paddr_list[0]);
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}
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if (!(gc_rq->secs_to_gc))
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goto out;
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rqd.opcode = NVM_OP_PREAD;
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rqd.nr_ppas = gc_rq->secs_to_gc;
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if (pblk_submit_io_sync(pblk, &rqd, gc_rq->data)) {
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ret = -EIO;
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goto err_free_dma;
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}
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pblk_read_check_rand(pblk, &rqd, gc_rq->lba_list, gc_rq->nr_secs);
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atomic_dec(&pblk->inflight_io);
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if (rqd.error) {
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atomic_long_inc(&pblk->read_failed_gc);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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pblk_print_failed_rqd(pblk, &rqd, rqd.error);
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#endif
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}
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads);
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atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads);
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atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads);
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#endif
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out:
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pblk_free_rqd_meta(pblk, &rqd);
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return ret;
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err_free_dma:
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pblk_free_rqd_meta(pblk, &rqd);
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return ret;
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}
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