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Madhani , John Garry Subject: [PATCH RFC 01/16] block: Add atomic write operations to request_queue limits Date: Wed, 3 May 2023 18:38:06 +0000 Message-Id: <20230503183821.1473305-2-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230503183821.1473305-1-john.g.garry@oracle.com> References: <20230503183821.1473305-1-john.g.garry@oracle.com> X-ClientProxiedBy: LO4P265CA0159.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:2c7::9) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|MW4PR10MB5677:EE_ X-MS-Office365-Filtering-Correlation-Id: e1c5b909-9843-47f8-a187-08db4c05ba47 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2305030160 X-Proofpoint-ORIG-GUID: p7XqqkWTccMA7iPMXgI6LSfRrlJFliuW X-Proofpoint-GUID: p7XqqkWTccMA7iPMXgI6LSfRrlJFliuW Precedence: bulk List-ID: From: Himanshu Madhani Add the following limits: - atomic_write_boundary - atomic_write_max_bytes - atomic_write_unit_max - atomic_write_unit_min Signed-off-by: Himanshu Madhani Signed-off-by: John Garry --- Documentation/ABI/stable/sysfs-block | 42 +++++++++++++++++++++ block/blk-settings.c | 56 ++++++++++++++++++++++++++++ block/blk-sysfs.c | 33 ++++++++++++++++ include/linux/blkdev.h | 23 ++++++++++++ 4 files changed, 154 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index 282de3680367..f3ed9890e03b 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -21,6 +21,48 @@ Description: device is offset from the internal allocation unit's natural alignment. +What: /sys/block//atomic_write_max_bytes +Date: May 2023 +Contact: Himanshu Madhani +Description: + [RO] This parameter specifies the maximum atomic write + size reported by the device. An atomic write operation + must not exceed this number of bytes. + + +What: /sys/block//atomic_write_unit_min +Date: May 2023 +Contact: Himanshu Madhani +Description: + [RO] This parameter specifies the smallest block which can + be written atomically with an atomic write operation. All + atomic write operations must begin at a + atomic_write_unit_min boundary and must be multiples of + atomic_write_unit_min. This value must be a power-of-two. + + +What: /sys/block//atomic_write_unit_max +Date: January 2023 +Contact: Himanshu Madhani +Description: + [RO] This parameter defines the largest block which can be + written atomically with an atomic write operation. This + value must be a multiple of atomic_write_unit_min and must + be a power-of-two. + + +What: /sys/block//atomic_write_boundary +Date: May 2023 +Contact: Himanshu Madhani +Description: + [RO] A device may need to internally split I/Os which + straddle a given logical block address boundary. In that + case a single atomic write operation will be processed as + one of more sub-operations which each complete atomically. + This parameter specifies the size in bytes of the atomic + boundary if one is reported by the device. This value must + be a power-of-two. + What: /sys/block//diskseq Date: February 2021 diff --git a/block/blk-settings.c b/block/blk-settings.c index 896b4654ab00..e21731715a12 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -59,6 +59,9 @@ void blk_set_default_limits(struct queue_limits *lim) lim->zoned = BLK_ZONED_NONE; lim->zone_write_granularity = 0; lim->dma_alignment = 511; + lim->atomic_write_unit_min = lim->atomic_write_unit_max = 1; + lim->atomic_write_max_bytes = 512; + lim->atomic_write_boundary = 0; } /** @@ -183,6 +186,59 @@ void blk_queue_max_discard_sectors(struct request_queue *q, } EXPORT_SYMBOL(blk_queue_max_discard_sectors); +/** + * blk_queue_atomic_write_max_bytes - set max bytes supported by + * the device for atomic write operations. + * @q: the request queue for the device + * @size: maximum bytes supported + */ +void blk_queue_atomic_write_max_bytes(struct request_queue *q, + unsigned int size) +{ + q->limits.atomic_write_max_bytes = size; +} +EXPORT_SYMBOL(blk_queue_atomic_write_max_bytes); + +/** + * blk_queue_atomic_write_boundary - Device's logical block address space + * which an atomic write should not cross. + * @q: the request queue for the device + * @size: size in bytes. Must be a power-of-two. + */ +void blk_queue_atomic_write_boundary(struct request_queue *q, + unsigned int size) +{ + q->limits.atomic_write_boundary = size; +} +EXPORT_SYMBOL(blk_queue_atomic_write_boundary); + +/** + * blk_queue_atomic_write_unit_min - smallest unit that can be written + * atomically to the device. + * @q: the request queue for the device + * @sectors: must be a power-of-two. + */ +void blk_queue_atomic_write_unit_min(struct request_queue *q, + unsigned int sectors) +{ + q->limits.atomic_write_unit_min = sectors; +} +EXPORT_SYMBOL(blk_queue_atomic_write_unit_min); + +/* + * blk_queue_atomic_write_unit_max - largest unit that can be written + * atomically to the device. + * @q: the reqeust queue for the device + * @sectors: must be a power-of-two. + */ +void blk_queue_atomic_write_unit_max(struct request_queue *q, + unsigned int sectors) +{ + struct queue_limits *limits = &q->limits; + limits->atomic_write_unit_max = sectors; +} +EXPORT_SYMBOL(blk_queue_atomic_write_unit_max); + /** * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase * @q: the request queue for the device diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index f1fce1c7fa44..1025beff2281 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -132,6 +132,30 @@ static ssize_t queue_max_discard_segments_show(struct request_queue *q, return queue_var_show(queue_max_discard_segments(q), page); } +static ssize_t queue_atomic_write_max_bytes_show(struct request_queue *q, + char *page) +{ + return queue_var_show(q->limits.atomic_write_max_bytes, page); +} + +static ssize_t queue_atomic_write_boundary_show(struct request_queue *q, + char *page) +{ + return queue_var_show(q->limits.atomic_write_boundary, page); +} + +static ssize_t queue_atomic_write_unit_min_show(struct request_queue *q, + char *page) +{ + return queue_var_show(queue_atomic_write_unit_min(q), page); +} + +static ssize_t queue_atomic_write_unit_max_show(struct request_queue *q, + char *page) +{ + return queue_var_show(queue_atomic_write_unit_max(q), page); +} + static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) { return queue_var_show(q->limits.max_integrity_segments, page); @@ -604,6 +628,11 @@ QUEUE_RO_ENTRY(queue_discard_max_hw, "discard_max_hw_bytes"); QUEUE_RW_ENTRY(queue_discard_max, "discard_max_bytes"); QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data"); +QUEUE_RO_ENTRY(queue_atomic_write_max_bytes, "atomic_write_max_bytes"); +QUEUE_RO_ENTRY(queue_atomic_write_boundary, "atomic_write_boundary"); +QUEUE_RO_ENTRY(queue_atomic_write_unit_max, "atomic_write_unit_max"); +QUEUE_RO_ENTRY(queue_atomic_write_unit_min, "atomic_write_unit_min"); + QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes"); QUEUE_RO_ENTRY(queue_write_zeroes_max, "write_zeroes_max_bytes"); QUEUE_RO_ENTRY(queue_zone_append_max, "zone_append_max_bytes"); @@ -661,6 +690,10 @@ static struct attribute *queue_attrs[] = { &queue_discard_max_entry.attr, &queue_discard_max_hw_entry.attr, &queue_discard_zeroes_data_entry.attr, + &queue_atomic_write_max_bytes_entry.attr, + &queue_atomic_write_boundary_entry.attr, + &queue_atomic_write_unit_min_entry.attr, + &queue_atomic_write_unit_max_entry.attr, &queue_write_same_max_entry.attr, &queue_write_zeroes_max_entry.attr, &queue_zone_append_max_entry.attr, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 941304f17492..6b6f2992338c 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -304,6 +304,11 @@ struct queue_limits { unsigned int discard_alignment; unsigned int zone_write_granularity; + unsigned int atomic_write_boundary; + unsigned int atomic_write_max_bytes; + unsigned int atomic_write_unit_min; + unsigned int atomic_write_unit_max; + unsigned short max_segments; unsigned short max_integrity_segments; unsigned short max_discard_segments; @@ -929,6 +934,14 @@ void blk_queue_zone_write_granularity(struct request_queue *q, unsigned int size); extern void blk_queue_alignment_offset(struct request_queue *q, unsigned int alignment); +extern void blk_queue_atomic_write_max_bytes(struct request_queue *q, + unsigned int size); +extern void blk_queue_atomic_write_unit_max(struct request_queue *q, + unsigned int sectors); +extern void blk_queue_atomic_write_unit_min(struct request_queue *q, + unsigned int sectors); +extern void blk_queue_atomic_write_boundary(struct request_queue *q, + unsigned int size); void disk_update_readahead(struct gendisk *disk); extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); extern void blk_queue_io_min(struct request_queue *q, unsigned int min); @@ -1331,6 +1344,16 @@ static inline int queue_dma_alignment(const struct request_queue *q) return q ? q->limits.dma_alignment : 511; } +static inline unsigned int queue_atomic_write_unit_max(const struct request_queue *q) +{ + return q->limits.atomic_write_unit_max << SECTOR_SHIFT; +} + +static inline unsigned int queue_atomic_write_unit_min(const struct request_queue *q) +{ + return q->limits.atomic_write_unit_min << SECTOR_SHIFT; +} + static inline unsigned int bdev_dma_alignment(struct block_device *bdev) { return queue_dma_alignment(bdev_get_queue(bdev));