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137 lines
3.5 KiB
137 lines
3.5 KiB
// 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 <[email protected]> |
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* Matias Bjorling <[email protected]> |
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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-cache.c - pblk's write cache |
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*/ |
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#include "pblk.h" |
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void pblk_write_to_cache(struct pblk *pblk, struct bio *bio, |
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unsigned long flags) |
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{ |
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struct pblk_w_ctx w_ctx; |
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sector_t lba = pblk_get_lba(bio); |
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unsigned long start_time; |
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unsigned int bpos, pos; |
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int nr_entries = pblk_get_secs(bio); |
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int i, ret; |
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start_time = bio_start_io_acct(bio); |
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/* Update the write buffer head (mem) with the entries that we can |
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* write. The write in itself cannot fail, so there is no need to |
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* rollback from here on. |
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*/ |
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retry: |
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ret = pblk_rb_may_write_user(&pblk->rwb, bio, nr_entries, &bpos); |
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switch (ret) { |
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case NVM_IO_REQUEUE: |
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io_schedule(); |
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goto retry; |
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case NVM_IO_ERR: |
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pblk_pipeline_stop(pblk); |
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bio_io_error(bio); |
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goto out; |
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} |
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pblk_ppa_set_empty(&w_ctx.ppa); |
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w_ctx.flags = flags; |
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if (bio->bi_opf & REQ_PREFLUSH) { |
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w_ctx.flags |= PBLK_FLUSH_ENTRY; |
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pblk_write_kick(pblk); |
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} |
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if (unlikely(!bio_has_data(bio))) |
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goto out; |
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for (i = 0; i < nr_entries; i++) { |
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void *data = bio_data(bio); |
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w_ctx.lba = lba + i; |
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pos = pblk_rb_wrap_pos(&pblk->rwb, bpos + i); |
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pblk_rb_write_entry_user(&pblk->rwb, data, w_ctx, pos); |
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bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE); |
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} |
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atomic64_add(nr_entries, &pblk->user_wa); |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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atomic_long_add(nr_entries, &pblk->inflight_writes); |
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atomic_long_add(nr_entries, &pblk->req_writes); |
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#endif |
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pblk_rl_inserted(&pblk->rl, nr_entries); |
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out: |
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bio_end_io_acct(bio, start_time); |
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pblk_write_should_kick(pblk); |
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if (ret == NVM_IO_DONE) |
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bio_endio(bio); |
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} |
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/* |
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* On GC the incoming lbas are not necessarily sequential. Also, some of the |
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* lbas might not be valid entries, which are marked as empty by the GC thread |
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*/ |
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int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq) |
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{ |
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struct pblk_w_ctx w_ctx; |
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unsigned int bpos, pos; |
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void *data = gc_rq->data; |
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int i, valid_entries; |
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/* Update the write buffer head (mem) with the entries that we can |
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* write. The write in itself cannot fail, so there is no need to |
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* rollback from here on. |
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*/ |
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retry: |
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if (!pblk_rb_may_write_gc(&pblk->rwb, gc_rq->secs_to_gc, &bpos)) { |
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io_schedule(); |
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goto retry; |
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} |
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w_ctx.flags = PBLK_IOTYPE_GC; |
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pblk_ppa_set_empty(&w_ctx.ppa); |
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for (i = 0, valid_entries = 0; i < gc_rq->nr_secs; i++) { |
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if (gc_rq->lba_list[i] == ADDR_EMPTY) |
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continue; |
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w_ctx.lba = gc_rq->lba_list[i]; |
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pos = pblk_rb_wrap_pos(&pblk->rwb, bpos + valid_entries); |
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pblk_rb_write_entry_gc(&pblk->rwb, data, w_ctx, gc_rq->line, |
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gc_rq->paddr_list[i], pos); |
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data += PBLK_EXPOSED_PAGE_SIZE; |
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valid_entries++; |
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} |
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WARN_ONCE(gc_rq->secs_to_gc != valid_entries, |
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"pblk: inconsistent GC write\n"); |
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atomic64_add(valid_entries, &pblk->gc_wa); |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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atomic_long_add(valid_entries, &pblk->inflight_writes); |
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atomic_long_add(valid_entries, &pblk->recov_gc_writes); |
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#endif |
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pblk_write_should_kick(pblk); |
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return NVM_IO_OK; |
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}
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