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![Javier González](/assets/img/avatar_default.png)
Since pblk registers its own block device, the iostat accounting is not automatically done for us. Therefore, add the necessary accounting logic to satisfy the iostat interface. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>
612 lines
15 KiB
C
612 lines
15 KiB
C
/*
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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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int bio_iter, bool advanced_bio)
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{
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#ifdef CONFIG_NVM_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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bio_iter, advanced_bio);
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}
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static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
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sector_t blba, unsigned long *read_bitmap)
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{
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struct pblk_sec_meta *meta_list = rqd->meta_list;
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struct bio *bio = rqd->bio;
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struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS];
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int nr_secs = rqd->nr_ppas;
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bool advanced_bio = false;
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int i, j = 0;
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pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs);
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for (i = 0; i < nr_secs; i++) {
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struct ppa_addr p = ppas[i];
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sector_t lba = blba + i;
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retry:
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if (pblk_ppa_empty(p)) {
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WARN_ON(test_and_set_bit(i, read_bitmap));
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meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
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if (unlikely(!advanced_bio)) {
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bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE);
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advanced_bio = true;
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}
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goto next;
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}
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/* Try to read from write buffer. The address is later checked
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* on the write buffer to prevent retrieving overwritten data.
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*/
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if (pblk_addr_in_cache(p)) {
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if (!pblk_read_from_cache(pblk, bio, lba, p, i,
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advanced_bio)) {
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pblk_lookup_l2p_seq(pblk, &p, lba, 1);
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goto retry;
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}
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WARN_ON(test_and_set_bit(i, read_bitmap));
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meta_list[i].lba = cpu_to_le64(lba);
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advanced_bio = true;
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#ifdef CONFIG_NVM_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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/* Read from media non-cached sectors */
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rqd->ppa_list[j++] = p;
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}
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next:
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if (advanced_bio)
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bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
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}
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if (pblk_io_aligned(pblk, nr_secs))
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rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
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else
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rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
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#ifdef CONFIG_NVM_DEBUG
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atomic_long_add(nr_secs, &pblk->inflight_reads);
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#endif
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}
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static int pblk_submit_read_io(struct pblk *pblk, struct nvm_rq *rqd)
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{
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int err;
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err = pblk_submit_io(pblk, rqd);
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if (err)
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return NVM_IO_ERR;
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return NVM_IO_OK;
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}
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static void pblk_read_check(struct pblk *pblk, struct nvm_rq *rqd,
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sector_t blba)
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{
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struct pblk_sec_meta *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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for (i = 0; i < nr_lbas; i++) {
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u64 lba = le64_to_cpu(meta_list[i].lba);
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if (lba == ADDR_EMPTY)
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continue;
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WARN(lba != blba + i, "pblk: corrupted read LBA\n");
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}
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}
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static void pblk_read_put_rqd_kref(struct pblk *pblk, struct nvm_rq *rqd)
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{
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struct ppa_addr *ppa_list;
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int i;
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ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
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for (i = 0; i < rqd->nr_ppas; i++) {
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struct ppa_addr ppa = ppa_list[i];
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struct pblk_line *line;
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line = &pblk->lines[pblk_ppa_to_line(ppa)];
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kref_put(&line->ref, pblk_line_put_wq);
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}
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}
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static void pblk_end_user_read(struct bio *bio)
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{
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#ifdef CONFIG_NVM_DEBUG
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WARN_ONCE(bio->bi_status, "pblk: corrupted read bio\n");
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#endif
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bio_endio(bio);
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bio_put(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 nvm_tgt_dev *dev = pblk->dev;
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struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
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struct bio *bio = rqd->bio;
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unsigned long start_time = r_ctx->start_time;
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generic_end_io_acct(dev->q, READ, &pblk->disk->part0, start_time);
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if (rqd->error)
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pblk_log_read_err(pblk, rqd);
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#ifdef CONFIG_NVM_DEBUG
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else
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WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n");
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#endif
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pblk_read_check(pblk, rqd, r_ctx->lba);
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bio_put(bio);
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if (r_ctx->private)
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pblk_end_user_read((struct bio *)r_ctx->private);
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if (put_line)
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pblk_read_put_rqd_kref(pblk, rqd);
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#ifdef CONFIG_NVM_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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__pblk_end_io_read(pblk, rqd, true);
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}
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static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
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unsigned int bio_init_idx,
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unsigned long *read_bitmap)
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{
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struct bio *new_bio, *bio = rqd->bio;
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struct pblk_sec_meta *meta_list = rqd->meta_list;
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struct bio_vec src_bv, dst_bv;
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void *ppa_ptr = NULL;
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void *src_p, *dst_p;
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dma_addr_t dma_ppa_list = 0;
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__le64 *lba_list_mem, *lba_list_media;
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int nr_secs = rqd->nr_ppas;
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int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
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int i, ret, hole;
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/* Re-use allocated memory for intermediate lbas */
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lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size);
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lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size);
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new_bio = bio_alloc(GFP_KERNEL, nr_holes);
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if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes))
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goto err;
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if (nr_holes != new_bio->bi_vcnt) {
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pr_err("pblk: malformed bio\n");
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goto err;
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}
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for (i = 0; i < nr_secs; i++)
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lba_list_mem[i] = meta_list[i].lba;
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new_bio->bi_iter.bi_sector = 0; /* internal bio */
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bio_set_op_attrs(new_bio, REQ_OP_READ, 0);
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rqd->bio = new_bio;
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rqd->nr_ppas = nr_holes;
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rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
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if (unlikely(nr_holes == 1)) {
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ppa_ptr = rqd->ppa_list;
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dma_ppa_list = rqd->dma_ppa_list;
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rqd->ppa_addr = rqd->ppa_list[0];
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}
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ret = pblk_submit_io_sync(pblk, rqd);
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if (ret) {
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bio_put(rqd->bio);
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pr_err("pblk: sync read IO submission failed\n");
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goto err;
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}
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if (rqd->error) {
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atomic_long_inc(&pblk->read_failed);
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#ifdef CONFIG_NVM_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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if (unlikely(nr_holes == 1)) {
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struct ppa_addr ppa;
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ppa = rqd->ppa_addr;
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rqd->ppa_list = ppa_ptr;
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rqd->dma_ppa_list = dma_ppa_list;
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rqd->ppa_list[0] = ppa;
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}
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for (i = 0; i < nr_secs; i++) {
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lba_list_media[i] = meta_list[i].lba;
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meta_list[i].lba = lba_list_mem[i];
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}
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/* Fill the holes in the original bio */
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i = 0;
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hole = find_first_zero_bit(read_bitmap, nr_secs);
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do {
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int line_id = pblk_ppa_to_line(rqd->ppa_list[i]);
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struct pblk_line *line = &pblk->lines[line_id];
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kref_put(&line->ref, pblk_line_put);
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meta_list[hole].lba = lba_list_media[i];
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src_bv = new_bio->bi_io_vec[i++];
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dst_bv = bio->bi_io_vec[bio_init_idx + hole];
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src_p = kmap_atomic(src_bv.bv_page);
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dst_p = kmap_atomic(dst_bv.bv_page);
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memcpy(dst_p + dst_bv.bv_offset,
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src_p + src_bv.bv_offset,
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PBLK_EXPOSED_PAGE_SIZE);
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kunmap_atomic(src_p);
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kunmap_atomic(dst_p);
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mempool_free(src_bv.bv_page, pblk->page_bio_pool);
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hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1);
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} while (hole < nr_secs);
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bio_put(new_bio);
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/* Complete the original bio and associated request */
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bio_endio(bio);
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rqd->bio = bio;
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rqd->nr_ppas = nr_secs;
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__pblk_end_io_read(pblk, rqd, false);
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return NVM_IO_OK;
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err:
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pr_err("pblk: failed to perform partial read\n");
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/* Free allocated pages in new bio */
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pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt);
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__pblk_end_io_read(pblk, rqd, false);
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return NVM_IO_ERR;
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}
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static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd,
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sector_t lba, unsigned long *read_bitmap)
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{
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struct pblk_sec_meta *meta_list = rqd->meta_list;
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struct bio *bio = rqd->bio;
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struct ppa_addr ppa;
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pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
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#ifdef CONFIG_NVM_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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WARN_ON(test_and_set_bit(0, read_bitmap));
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meta_list[0].lba = cpu_to_le64(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, 0, 1)) {
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pblk_lookup_l2p_seq(pblk, &ppa, lba, 1);
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goto retry;
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}
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WARN_ON(test_and_set_bit(0, read_bitmap));
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meta_list[0].lba = cpu_to_le64(lba);
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#ifdef CONFIG_NVM_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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rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
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}
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int pblk_submit_read(struct pblk *pblk, struct bio *bio)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct request_queue *q = dev->q;
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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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struct pblk_g_ctx *r_ctx;
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struct nvm_rq *rqd;
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unsigned int bio_init_idx;
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unsigned long read_bitmap; /* Max 64 ppas per request */
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int ret = NVM_IO_ERR;
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/* logic error: lba out-of-bounds. Ignore read request */
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if (blba >= pblk->rl.nr_secs || nr_secs > PBLK_MAX_REQ_ADDRS) {
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WARN(1, "pblk: read lba out of bounds (lba:%llu, nr:%d)\n",
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(unsigned long long)blba, nr_secs);
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return NVM_IO_ERR;
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}
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generic_start_io_acct(q, READ, bio_sectors(bio), &pblk->disk->part0);
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bitmap_zero(&read_bitmap, nr_secs);
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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->bio = bio;
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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 = jiffies;
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r_ctx->lba = blba;
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/* Save the index for this bio's start. This is needed in case
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* we need to fill a partial read.
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*/
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bio_init_idx = pblk_get_bi_idx(bio);
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rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
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&rqd->dma_meta_list);
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if (!rqd->meta_list) {
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pr_err("pblk: not able to allocate ppa list\n");
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goto fail_rqd_free;
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}
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if (nr_secs > 1) {
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rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size;
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rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size;
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pblk_read_ppalist_rq(pblk, rqd, blba, &read_bitmap);
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} else {
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pblk_read_rq(pblk, rqd, blba, &read_bitmap);
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}
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bio_get(bio);
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if (bitmap_full(&read_bitmap, nr_secs)) {
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bio_endio(bio);
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atomic_inc(&pblk->inflight_io);
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__pblk_end_io_read(pblk, rqd, false);
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return NVM_IO_OK;
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}
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/* All sectors are to be read from the device */
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if (bitmap_empty(&read_bitmap, rqd->nr_ppas)) {
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struct bio *int_bio = NULL;
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/* Clone read bio to deal with read errors internally */
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int_bio = bio_clone_fast(bio, GFP_KERNEL, pblk_bio_set);
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if (!int_bio) {
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pr_err("pblk: could not clone read bio\n");
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goto fail_end_io;
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}
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rqd->bio = int_bio;
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r_ctx->private = bio;
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ret = pblk_submit_read_io(pblk, rqd);
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if (ret) {
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pr_err("pblk: read IO submission failed\n");
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if (int_bio)
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bio_put(int_bio);
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goto fail_end_io;
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}
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return NVM_IO_OK;
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}
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/* The read bio request could be partially filled by the write buffer,
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* but there are some holes that need to be read from the drive.
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*/
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return pblk_partial_read_bio(pblk, rqd, bio_init_idx, &read_bitmap);
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fail_rqd_free:
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pblk_free_rqd(pblk, rqd, PBLK_READ);
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return ret;
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fail_end_io:
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__pblk_end_io_read(pblk, rqd, false);
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return ret;
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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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{
|
|
struct ppa_addr ppa_list_l2p[PBLK_MAX_REQ_ADDRS];
|
|
struct ppa_addr ppa_gc;
|
|
int valid_secs = 0;
|
|
int i;
|
|
|
|
pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs);
|
|
|
|
for (i = 0; i < nr_secs; i++) {
|
|
if (lba_list[i] == ADDR_EMPTY)
|
|
continue;
|
|
|
|
ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id);
|
|
if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) {
|
|
paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY;
|
|
continue;
|
|
}
|
|
|
|
rqd->ppa_list[valid_secs++] = ppa_list_l2p[i];
|
|
}
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
atomic_long_add(valid_secs, &pblk->inflight_reads);
|
|
#endif
|
|
|
|
return valid_secs;
|
|
}
|
|
|
|
static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
|
|
struct pblk_line *line, sector_t lba,
|
|
u64 paddr_gc)
|
|
{
|
|
struct ppa_addr ppa_l2p, ppa_gc;
|
|
int valid_secs = 0;
|
|
|
|
if (lba == ADDR_EMPTY)
|
|
goto out;
|
|
|
|
/* logic error: lba out-of-bounds */
|
|
if (lba >= pblk->rl.nr_secs) {
|
|
WARN(1, "pblk: read lba out of bounds\n");
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&pblk->trans_lock);
|
|
ppa_l2p = pblk_trans_map_get(pblk, lba);
|
|
spin_unlock(&pblk->trans_lock);
|
|
|
|
ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id);
|
|
if (!pblk_ppa_comp(ppa_l2p, ppa_gc))
|
|
goto out;
|
|
|
|
rqd->ppa_addr = ppa_l2p;
|
|
valid_secs = 1;
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
atomic_long_inc(&pblk->inflight_reads);
|
|
#endif
|
|
|
|
out:
|
|
return valid_secs;
|
|
}
|
|
|
|
int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
|
|
{
|
|
struct nvm_tgt_dev *dev = pblk->dev;
|
|
struct nvm_geo *geo = &dev->geo;
|
|
struct bio *bio;
|
|
struct nvm_rq rqd;
|
|
int data_len;
|
|
int ret = NVM_IO_OK;
|
|
|
|
memset(&rqd, 0, sizeof(struct nvm_rq));
|
|
|
|
rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
|
|
&rqd.dma_meta_list);
|
|
if (!rqd.meta_list)
|
|
return -ENOMEM;
|
|
|
|
if (gc_rq->nr_secs > 1) {
|
|
rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size;
|
|
rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size;
|
|
|
|
gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line,
|
|
gc_rq->lba_list,
|
|
gc_rq->paddr_list,
|
|
gc_rq->nr_secs);
|
|
if (gc_rq->secs_to_gc == 1)
|
|
rqd.ppa_addr = rqd.ppa_list[0];
|
|
} else {
|
|
gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line,
|
|
gc_rq->lba_list[0],
|
|
gc_rq->paddr_list[0]);
|
|
}
|
|
|
|
if (!(gc_rq->secs_to_gc))
|
|
goto out;
|
|
|
|
data_len = (gc_rq->secs_to_gc) * geo->sec_size;
|
|
bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len,
|
|
PBLK_VMALLOC_META, GFP_KERNEL);
|
|
if (IS_ERR(bio)) {
|
|
pr_err("pblk: could not allocate GC bio (%lu)\n", PTR_ERR(bio));
|
|
goto err_free_dma;
|
|
}
|
|
|
|
bio->bi_iter.bi_sector = 0; /* internal bio */
|
|
bio_set_op_attrs(bio, REQ_OP_READ, 0);
|
|
|
|
rqd.opcode = NVM_OP_PREAD;
|
|
rqd.nr_ppas = gc_rq->secs_to_gc;
|
|
rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
|
|
rqd.bio = bio;
|
|
|
|
if (pblk_submit_io_sync(pblk, &rqd)) {
|
|
ret = -EIO;
|
|
pr_err("pblk: GC read request failed\n");
|
|
goto err_free_bio;
|
|
}
|
|
|
|
atomic_dec(&pblk->inflight_io);
|
|
|
|
if (rqd.error) {
|
|
atomic_long_inc(&pblk->read_failed_gc);
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
pblk_print_failed_rqd(pblk, &rqd, rqd.error);
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads);
|
|
atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads);
|
|
atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads);
|
|
#endif
|
|
|
|
out:
|
|
nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
|
|
return ret;
|
|
|
|
err_free_bio:
|
|
bio_put(bio);
|
|
err_free_dma:
|
|
nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
|
|
return ret;
|
|
}
|