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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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6ca2f71f3e
On REQ_PREFLUSH, directly tag the I/O context flags to signal a flush in the write to cache path, instead of finding the correct entry context and imposing a memory barrier. This simplifies the code and might potentially prevent race conditions when adding functionality to the write path. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>
123 lines
3.1 KiB
C
123 lines
3.1 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-cache.c - pblk's write cache
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*/
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#include "pblk.h"
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int pblk_write_to_cache(struct pblk *pblk, struct bio *bio, 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 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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/* 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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goto out;
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}
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if (unlikely(!bio_has_data(bio)))
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goto out;
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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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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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#ifdef CONFIG_NVM_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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pblk_write_should_kick(pblk);
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return ret;
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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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#ifdef CONFIG_NVM_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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