From: Christoph Hellwig <hch@lst.de>
To: John Garry <john.g.garry@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>,
"Darrick J. Wong" <djwong@kernel.org>,
axboe@kernel.dk, kbusch@kernel.org, sagi@grimberg.me,
jejb@linux.ibm.com, martin.petersen@oracle.com,
viro@zeniv.linux.org.uk, brauner@kernel.org, dchinner@redhat.com,
jack@suse.cz, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
tytso@mit.edu, jbongio@google.com, linux-scsi@vger.kernel.org,
ming.lei@redhat.com, jaswin@linux.ibm.com, bvanassche@acm.org
Subject: Re: [PATCH v2 00/16] block atomic writes
Date: Thu, 21 Dec 2023 13:57:13 +0100 [thread overview]
Message-ID: <20231221125713.GA24013@lst.de> (raw)
In-Reply-To: <df2b6c6e-6415-489d-be19-7e2217f79098@oracle.com>
On Thu, Dec 21, 2023 at 12:48:24PM +0000, John Garry wrote:
>>> - ubuf / iovecs need to be PAGE-aligned
>>> - each iovec needs to be length of multiple of atomic_write_unit_min. If
>>> total length > PAGE_SIZE, each iovec also needs to be a multiple of
>>> PAGE_SIZE.
>>>
>>> I'd rather something simpler. Maybe it's ok.
>> If we decided to not support atomic writes on anything setting a virt
>> boundary we don't have to care about the alignment of each vector,
>
> ok, I think that alignment is not so important, but we still need to
> consider a minimum length per iovec, such that we will always be able to
> fit a write of length atomic_write_unit_max in a bio.
I don't think you man a minim length per iovec for that, but a maximum
number of iovecs instead. For SGL-capable devices that would be
BIO_MAX_VECS, otherwise 1.
next prev parent reply other threads:[~2023-12-21 12:57 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 11:08 [PATCH v2 00/16] block atomic writes John Garry
2023-12-12 11:08 ` [PATCH v2 01/16] block: Add atomic write operations to request_queue limits John Garry
2023-12-13 1:25 ` Ming Lei
2023-12-13 9:13 ` John Garry
2023-12-13 12:28 ` Ming Lei
2023-12-13 19:01 ` John Garry
2023-12-14 4:38 ` Martin K. Petersen
2023-12-14 13:46 ` Ming Lei
2023-12-14 4:34 ` Martin K. Petersen
2023-12-14 16:12 ` Christoph Hellwig
2023-12-12 11:08 ` [PATCH v2 02/16] block: Limit atomic writes according to bio and queue limits John Garry
2023-12-12 11:08 ` [PATCH v2 03/16] fs/bdev: Add atomic write support info to statx John Garry
2023-12-13 10:24 ` Jan Kara
2023-12-13 11:02 ` John Garry
2023-12-12 11:08 ` [PATCH v2 04/16] fs: Increase fmode_t size John Garry
2023-12-13 11:20 ` Jan Kara
2023-12-13 13:03 ` John Garry
2023-12-13 13:02 ` Christian Brauner
2023-12-13 13:15 ` John Garry
2023-12-13 16:03 ` Christoph Hellwig
2023-12-14 8:56 ` John Garry
2023-12-12 11:08 ` [PATCH v2 05/16] fs: Add RWF_ATOMIC and IOCB_ATOMIC flags for atomic write support John Garry
2023-12-13 13:31 ` Al Viro
2023-12-13 16:02 ` John Garry
2024-01-22 8:29 ` John Garry
2023-12-12 11:08 ` [PATCH v2 06/16] block: Add REQ_ATOMIC flag John Garry
2023-12-12 11:08 ` [PATCH v2 07/16] block: Pass blk_queue_get_max_sectors() a request pointer John Garry
2023-12-12 11:08 ` [PATCH v2 08/16] block: Limit atomic write IO size according to atomic_write_max_sectors John Garry
2023-12-15 2:27 ` Ming Lei
2023-12-15 13:55 ` John Garry
2023-12-12 11:08 ` [PATCH v2 09/16] block: Error an attempt to split an atomic write bio John Garry
2023-12-12 11:08 ` [PATCH v2 10/16] block: Add checks to merging of atomic writes John Garry
2023-12-12 11:08 ` [PATCH v2 11/16] block: Add fops atomic write support John Garry
2023-12-12 11:08 ` [PATCH v2 12/16] scsi: sd: Support reading atomic write properties from block limits VPD John Garry
2023-12-12 11:08 ` [PATCH v2 13/16] scsi: sd: Add WRITE_ATOMIC_16 support John Garry
2023-12-12 11:08 ` [PATCH v2 14/16] scsi: scsi_debug: Atomic write support John Garry
2023-12-12 11:08 ` [PATCH v2 15/16] nvme: Support atomic writes John Garry
2023-12-12 11:08 ` [PATCH v2 16/16] nvme: Ensure atomic writes will be executed atomically John Garry
2023-12-12 16:32 ` [PATCH v2 00/16] block atomic writes Christoph Hellwig
2023-12-13 9:32 ` John Garry
2023-12-13 15:44 ` Christoph Hellwig
2023-12-13 16:27 ` John Garry
2023-12-14 14:37 ` Christoph Hellwig
2023-12-14 15:46 ` John Garry
2023-12-18 22:50 ` Keith Busch
2023-12-19 5:14 ` Darrick J. Wong
2023-12-19 5:21 ` Christoph Hellwig
2023-12-19 12:41 ` John Garry
2023-12-19 15:17 ` Christoph Hellwig
2023-12-19 16:53 ` John Garry
2023-12-21 6:50 ` Christoph Hellwig
2023-12-21 9:49 ` John Garry
2023-12-21 12:19 ` Christoph Hellwig
2023-12-21 12:48 ` John Garry
2023-12-21 12:57 ` Christoph Hellwig [this message]
2023-12-21 13:18 ` John Garry
2023-12-21 13:22 ` Christoph Hellwig
2023-12-21 13:56 ` John Garry
2024-01-16 11:35 ` John Garry
2024-01-17 15:02 ` Christoph Hellwig
2024-01-17 16:16 ` John Garry
2024-01-09 9:55 ` John Garry
2024-01-09 16:02 ` Christoph Hellwig
2024-01-09 16:52 ` John Garry
2024-01-09 23:04 ` Dave Chinner
2024-01-10 8:55 ` John Garry
2024-01-10 9:19 ` Christoph Hellwig
2024-01-11 1:40 ` Darrick J. Wong
2024-01-11 5:02 ` Christoph Hellwig
2024-01-11 9:55 ` John Garry
2024-01-11 14:45 ` Christoph Hellwig
2024-01-11 16:11 ` John Garry
2024-01-11 16:15 ` Christoph Hellwig
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