From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
linux-block <linux-block@vger.kernel.org>,
Damien Le Moal <Damien.LeMoal@wdc.com>,
Keith Busch <kbusch@kernel.org>,
"linux-scsi @ vger . kernel . org" <linux-scsi@vger.kernel.org>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
"linux-fsdevel @ vger . kernel . org"
<linux-fsdevel@vger.kernel.org>, Daniel Wagner <dwagner@suse.de>
Subject: Re: [PATCH v7 00/11] Introduce Zone Append for writing to zoned block devices
Date: Fri, 17 Apr 2020 12:03:26 -0400 [thread overview]
Message-ID: <20200417160326.GK5187@mit.edu> (raw)
In-Reply-To: <20200417121536.5393-1-johannes.thumshirn@wdc.com>
On Fri, Apr 17, 2020 at 09:15:25PM +0900, Johannes Thumshirn wrote:
> The upcoming NVMe ZNS Specification will define a new type of write
> command for zoned block devices, zone append.
>
> When when writing to a zoned block device using zone append, the start
> sector of the write is pointing at the start LBA of the zone to write to.
> Upon completion the block device will respond with the position the data
> has been placed in the zone. This from a high level perspective can be
> seen like a file system's block allocator, where the user writes to a
> file and the file-system takes care of the data placement on the device.
What sort of reordering can take place due to I/O schedulers and or
racing write appends from different CPU's? Is it purely the
userspace's responsibility to avoid racings writes to a particular
zone?
- Ted
next prev parent reply other threads:[~2020-04-17 16:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-17 12:15 [PATCH v7 00/11] Introduce Zone Append for writing to zoned block devices Johannes Thumshirn
2020-04-17 12:15 ` [PATCH v7 01/11] scsi: free sgtables in case command setup fails Johannes Thumshirn
2020-04-18 16:02 ` Bart Van Assche
2020-04-20 7:10 ` Johannes Thumshirn
2020-04-20 10:46 ` Johannes Thumshirn
2020-04-22 6:44 ` hch
2020-04-17 12:15 ` [PATCH v7 02/11] block: provide fallbacks for blk_queue_zone_is_seq and blk_queue_zone_no Johannes Thumshirn
2020-04-18 16:03 ` Bart Van Assche
2020-04-17 12:15 ` [PATCH v7 03/11] block: rename __bio_add_pc_page to bio_add_hw_page Johannes Thumshirn
2020-04-17 12:15 ` [PATCH v7 04/11] block: Introduce REQ_OP_ZONE_APPEND Johannes Thumshirn
2020-04-18 16:46 ` Bart Van Assche
2020-04-20 0:30 ` Damien Le Moal
2020-04-20 0:49 ` Bart Van Assche
2020-04-20 1:08 ` Damien Le Moal
2020-04-22 6:46 ` hch
2020-04-17 12:15 ` [PATCH v7 05/11] block: introduce blk_req_zone_write_trylock Johannes Thumshirn
2020-04-18 16:52 ` Bart Van Assche
2020-04-17 12:15 ` [PATCH v7 06/11] block: Modify revalidate zones Johannes Thumshirn
2020-04-22 6:47 ` Christoph Hellwig
2020-04-17 12:15 ` [PATCH v7 07/11] scsi: sd_zbc: factor out sanity checks for zoned commands Johannes Thumshirn
2020-04-18 16:56 ` Bart Van Assche
2020-04-17 12:15 ` [PATCH v7 08/11] scsi: sd_zbc: emulate ZONE_APPEND commands Johannes Thumshirn
2020-04-22 6:49 ` Christoph Hellwig
2020-04-17 12:15 ` [PATCH v7 09/11] null_blk: Support REQ_OP_ZONE_APPEND Johannes Thumshirn
2020-04-17 12:15 ` [PATCH v7 10/11] block: export bio_release_pages and bio_iov_iter_get_pages Johannes Thumshirn
2020-04-17 12:15 ` [PATCH v7 11/11] zonefs: use REQ_OP_ZONE_APPEND for sync DIO Johannes Thumshirn
2020-04-18 21:45 ` Bart Van Assche
2020-04-20 0:36 ` Damien Le Moal
2020-04-17 16:03 ` Theodore Y. Ts'o [this message]
2020-04-17 17:48 ` [PATCH v7 00/11] Introduce Zone Append for writing to zoned block devices Johannes Thumshirn
2020-04-18 1:00 ` Theodore Y. Ts'o
2020-04-18 8:57 ` Johannes Thumshirn
2020-04-19 22:51 ` Damien Le Moal
2020-04-18 15:56 ` Bart Van Assche
2020-04-20 0:21 ` Damien Le Moal
2020-04-20 1:06 ` Douglas Gilbert
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