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[199.255.44.250]) by smtp.gmail.com with ESMTPSA id p1-v6sm25342380pff.128.2018.10.09.04.15.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 09 Oct 2018 04:15:06 -0700 (PDT) From: =?UTF-8?q?Matias=20Bj=C3=B8rling?= To: axboe@fb.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Javier=20Gonz=C3=A1lez?= , =?UTF-8?q?Javier=20Gonz=C3=A1lez?= , =?UTF-8?q?Matias=20Bj=C3=B8rling?= Subject: [GIT PULL 34/45] lightnvm: pblk: take write semaphore on metadata Date: Tue, 9 Oct 2018 13:12:04 +0200 Message-Id: <20181009111215.7653-35-mb@lightnvm.io> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181009111215.7653-1-mb@lightnvm.io> References: <20181009111215.7653-1-mb@lightnvm.io> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Javier González pblk guarantees write ordering at a chunk level through a per open chunk semaphore. At this point, since we only have an open I/O stream for both user and GC data, the semaphore is per parallel unit. For the metadata I/O that is synchronous, the semaphore is not needed as ordering is guaranteed. However, if the metadata scheme changes or multiple streams are open, this guarantee might not be preserved. This patch makes sure that all writes go through the semaphore, even for synchronous I/O. This is consistent with pblk's write I/O model. It also simplifies maintenance since changes in the metadata scheme could cause ordering issues. Signed-off-by: Javier González Signed-off-by: Matias Bjørling --- drivers/lightnvm/pblk-core.c | 16 +++++++++++++++- drivers/lightnvm/pblk.h | 1 + 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c index 49cef93e328e..a3ce4a36dd33 100644 --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -557,6 +557,20 @@ int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd) return ret; } +int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct ppa_addr *ppa_list; + int ret; + + ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr; + + pblk_down_chunk(pblk, ppa_list[0]); + ret = pblk_submit_io_sync(pblk, rqd); + pblk_up_chunk(pblk, ppa_list[0]); + + return ret; +} + static void pblk_bio_map_addr_endio(struct bio *bio) { bio_put(bio); @@ -787,7 +801,7 @@ static int pblk_line_smeta_write(struct pblk *pblk, struct pblk_line *line, meta_list[i].lba = lba_list[paddr] = addr_empty; } - ret = pblk_submit_io_sync(pblk, &rqd); + ret = pblk_submit_io_sync_sem(pblk, &rqd); if (ret) { pblk_err(pblk, "smeta I/O submission failed: %d\n", ret); bio_put(bio); diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h index 02e2c02b0cf4..4c015c457197 100644 --- a/drivers/lightnvm/pblk.h +++ b/drivers/lightnvm/pblk.h @@ -792,6 +792,7 @@ void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd); void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd); int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd); int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd); +int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd); int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line); void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd); struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data, -- 2.17.1