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Mon, 28 Sep 2020 09:59:12 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, Damien.LeMoal@wdc.com Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, stable@vger.kernel.org, selvakuma.s1@samsung.com, nj.shetty@samsung.com, javier.gonz@samsung.com, Kanchan Joshi Subject: [PATCH v2 1/1] null_blk: synchronization fix for zoned device Date: Mon, 28 Sep 2020 15:25:49 +0530 Message-Id: <20200928095549.184510-2-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200928095549.184510-1-joshi.k@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupjleLIzCtJLcpLzFFi42LZdlhTU/fT5sJ4gyn98har7/azWbS2f2Oy eHznM7vF0f9v2Sz23tK2uLxrDpvFtt/zmS2uTFnEbPH6x0k2iwUbHzE6cHlcPlvq0bdlFaPH 501yHu0HupkCWKK4bFJSczLLUov07RK4MtY/6GYqOCJesfbeDtYGxo3CXYycHBICJhJXFq9g 6WLk4hAS2M0oce3gdyjnE6PEvw1LmCGcz4wSC8/OYIJp2TXrMTuILSSwi1FixmVvuKIVM8+y dTFycLAJaEpcmFwKUiMioCWxdGsjG0gNs8AJRomfpzeygiSEBdwkHrRNZwSxWQRUJTr2/mID sXkFLCVObfjKCLFMXmLmpe/sIDM5BawkPjYIQZQISpyc+YQFxGYGKmneOpsZovwru8S6RzIg 5RICLhITTsdChIUlXh3fwg5hS0m87G+Dsoslft05CvajhEAHo8T1hpksEAl7iYt7/jKBzGEG emX9Ln2IVXwSvb+fMEGM55XoaBOCqFaUuDfpKSuELS7xcMYSKNtD4sWhl0yQ0OlllOjZvZ5t AqP8LCQfzELywSyEbQsYmVcxSqYWFOempxabFhjmpZbrFSfmFpfmpesl5+duYgQnGS3PHYx3 H3zQO8TIxMF4iFGCg1lJhNc3pyBeiDclsbIqtSg/vqg0J7X4EKM0B4uSOK/SjzNxQgLpiSWp 2ampBalFMFkmDk6pBiZLz58ypk/nvP/b8/4q98tQlXW5rdUvw/Onmyqz1X34Eu0WKd0e+KaO Z6GNpcSRHXX8DT/mLefWC2q7c8VvX/3V6fwM/xm372HeyaVp5LtAOV+3Y89D8ZolgR9WPdnu Yrxk+ekJLF/fyP5T0Hb80H9DXWrbRYGqW2+aVjsxnzpmf6JcjnnHLjsRX1/+m6l/q++Vez6v XJ+de/pC7fb6wMj4Q3MmvlC7F37iEW/n2303qj7nah+7yvRnl2s0T8qGfzu2lXs9Fm5JX7VR o+NGyr2+P9MffWCYx8WS3G4zRdB81r4cy8mV02bOnn1jwruzXV8Cl5vJiq1ZnR3WdMJ4f/6l ZzJfJN1C3jWvvqPM/HWPEktxRqKhFnNRcSIAJcjwEKEDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrLLMWRmVeSWpSXmKPExsWy7bCSnO6nzYXxBocnsFisvtvPZtHa/o3J 4vGdz+wWR/+/ZbPYe0vb4vKuOWwW237PZ7a4MmURs8XrHyfZLBZsfMTowOVx+WypR9+WVYwe nzfJebQf6GYKYInisklJzcksSy3St0vgylj/oJup4Ih4xdp7O1gbGDcKdzFyckgImEjsmvWY vYuRi0NIYAejxJubR1kgEuISzdd+sEPYwhIr/z2HKvrIKLHmz2+mLkYODjYBTYkLk0tBakQE dCT2fWxjAalhFrjAKLHsyndWkISwgJvEg7bpjCA2i4CqRMfeX2wgNq+ApcSpDV8ZIRbIS8y8 9J0dZCangJXExwYhEFMIqOTMJy6IakGJkzOfgJ3GDFTdvHU28wRGgVlIUrOQpBYwMq1ilEwt KM5Nzy02LDDKSy3XK07MLS7NS9dLzs/dxAgOcS2tHYx7Vn3QO8TIxMF4iFGCg1lJhNc3pyBe iDclsbIqtSg/vqg0J7X4EKM0B4uSOO/XWQvjhATSE0tSs1NTC1KLYLJMHJxSDUzTs1iW2Os0 VLdV234QZV+vvIhhlp9ytdEUhUeL71dvKRLveMPWOvFcc0aqudThvhd/pvfcerXP33+F9Mrm bZ7THxvFMotuvPTmPXNWrzWvb35aV/tGh1mqbUGJZ/407HLTWu+5YPOZOuX/F6NNO5KU7Bk8 U9dZraz5a6C4b4974oL/Dcr3g6Ka774zOmsi13O13krNg1Vzbkl88cIao86sHROnBnx/cWpr ic356rjpIgffMQee/qMXZlygwfXEdwX3P5aypS2Ol9I3njW7bu6qusLsVqWJaeLTBTl5md+a z4jM945nzH/FmzzV+vZ6n0tyLTujI7rvbWhTn3BiTuc+AaXNHgzx/bpBQjuLlViKMxINtZiL ihMBM+U6y+ACAAA= X-CMS-MailID: 20200928095914epcas5p1beae8d5a201c35b598fde8288532d58d X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P X-CMS-RootMailID: 20200928095914epcas5p1beae8d5a201c35b598fde8288532d58d References: <20200928095549.184510-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Parallel write,read,zone-mgmt operations accessing/altering zone state and write-pointer may get into race. Avoid the situation by using a new spinlock for zoned device. Concurrent zone-appends (on a zone) returning same write-pointer issue is also avoided using this lock. Fixes: e0489ed5daeb ("null_blk: Support REQ_OP_ZONE_APPEND") Signed-off-by: Kanchan Joshi --- drivers/block/null_blk.h | 1 + drivers/block/null_blk_zoned.c | 22 ++++++++++++++++++---- 2 files changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/block/null_blk.h b/drivers/block/null_blk.h index daed4a9c3436..28099be50395 100644 --- a/drivers/block/null_blk.h +++ b/drivers/block/null_blk.h @@ -44,6 +44,7 @@ struct nullb_device { unsigned int nr_zones; struct blk_zone *zones; sector_t zone_size_sects; + spinlock_t zone_lock; unsigned long size; /* device size in MB */ unsigned long completion_nsec; /* time in ns to complete a request */ diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c index 3d25c9ad2383..e8d8b13aaa5a 100644 --- a/drivers/block/null_blk_zoned.c +++ b/drivers/block/null_blk_zoned.c @@ -45,6 +45,7 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) if (!dev->zones) return -ENOMEM; + spin_lock_init(&dev->zone_lock); if (dev->zone_nr_conv >= dev->nr_zones) { dev->zone_nr_conv = dev->nr_zones - 1; pr_info("changed the number of conventional zones to %u", @@ -131,8 +132,11 @@ int null_report_zones(struct gendisk *disk, sector_t sector, * So use a local copy to avoid corruption of the device zone * array. */ + spin_lock_irq(&dev->zone_lock); memcpy(&zone, &dev->zones[first_zone + i], sizeof(struct blk_zone)); + spin_unlock_irq(&dev->zone_lock); + error = cb(&zone, i, data); if (error) return error; @@ -277,18 +281,28 @@ static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op, blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op, sector_t sector, sector_t nr_sectors) { + blk_status_t sts; + struct nullb_device *dev = cmd->nq->dev; + + spin_lock_irq(&dev->zone_lock); switch (op) { case REQ_OP_WRITE: - return null_zone_write(cmd, sector, nr_sectors, false); + sts = null_zone_write(cmd, sector, nr_sectors, false); + break; case REQ_OP_ZONE_APPEND: - return null_zone_write(cmd, sector, nr_sectors, true); + sts = null_zone_write(cmd, sector, nr_sectors, true); + break; case REQ_OP_ZONE_RESET: case REQ_OP_ZONE_RESET_ALL: case REQ_OP_ZONE_OPEN: case REQ_OP_ZONE_CLOSE: case REQ_OP_ZONE_FINISH: - return null_zone_mgmt(cmd, op, sector); + sts = null_zone_mgmt(cmd, op, sector); + break; default: - return null_process_cmd(cmd, op, sector, nr_sectors); + sts = null_process_cmd(cmd, op, sector, nr_sectors); } + spin_unlock_irq(&dev->zone_lock); + + return sts; } -- 2.25.1