From: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
To: John Garry <john.g.garry@oracle.com>,
axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me,
jejb@linux.ibm.com, martin.petersen@oracle.com,
djwong@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org,
dchinner@redhat.com, jack@suse.cz
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org,
tytso@mit.edu, jbongio@google.com, linux-scsi@vger.kernel.org,
ojaswin@linux.ibm.com, linux-aio@kvack.org,
linux-btrfs@vger.kernel.org, io-uring@vger.kernel.org,
nilay@linux.ibm.com, John Garry <john.g.garry@oracle.com>
Subject: Re: [PATCH v4 05/11] block: Add core atomic write support
Date: Sun, 25 Feb 2024 17:51:34 +0530 [thread overview]
Message-ID: <87il2c20q9.fsf@doe.com> (raw)
In-Reply-To: <87le7821ad.fsf@doe.com>
Ritesh Harjani (IBM) <ritesh.list@gmail.com> writes:
> John Garry <john.g.garry@oracle.com> writes:
>
>> +
>> + mask = boundary - 1;
>> +
>> + /* start/end are boundary-aligned, so cannot be crossing */
>> + if (!(start & mask) || !(end & mask))
>> + return false;
>> +
>> + imask = ~mask;
>> +
>> + /* Top bits are different, so crossed a boundary */
>> + if ((start & imask) != (end & imask))
>> + return true;
>
> The last condition looks wrong. Shouldn't it be end - 1?
>
>> +
>> + return false;
>> +}
>
> Can we do something like this?
>
> static bool rq_straddles_atomic_write_boundary(struct request *rq,
> unsigned int start_adjust,
> unsigned int end_adjust)
> {
> unsigned int boundary = queue_atomic_write_boundary_bytes(rq->q);
> unsigned long boundary_mask;
> unsigned long start_rq_pos, end_rq_pos;
>
> if (!boundary)
> return false;
>
> start_rq_pos = blk_rq_pos(rq) << SECTOR_SHIFT;
> end_rq_pos = start_rq_pos + blk_rq_bytes(rq);
my bad. I meant this...
end_rq_pos = start_rq_pos + blk_rq_bytes(rq) - 1;
>
> start_rq_pos -= start_adjust;
> end_rq_pos += end_adjust;
>
> boundary_mask = boundary - 1;
>
> if ((start_rq_pos | boundary_mask) != (end_rq_pos | boundary_mask))
> return true;
>
> return false;
> }
>
> I was thinking this check should cover all cases? Thoughts?
>
>
-ritesh
next prev parent reply other threads:[~2024-02-25 12:21 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-19 13:00 [PATCH v4 00/11] block atomic writes John Garry
2024-02-19 13:00 ` [PATCH v4 01/11] block: Pass blk_queue_get_max_sectors() a request pointer John Garry
2024-02-19 18:57 ` Keith Busch
2024-02-19 13:01 ` [PATCH v4 02/11] block: Call blkdev_dio_unaligned() from blkdev_direct_IO() John Garry
2024-02-19 18:57 ` Keith Busch
2024-02-20 8:31 ` John Garry
2024-02-20 6:54 ` Christoph Hellwig
2024-02-19 13:01 ` [PATCH v4 03/11] fs: Initial atomic write support John Garry
2024-02-19 19:16 ` David Sterba
2024-02-20 8:13 ` John Garry
2024-02-19 22:44 ` Dave Chinner
2024-02-20 9:52 ` John Garry
2024-02-24 18:16 ` Ritesh Harjani
2024-02-24 18:20 ` Ritesh Harjani
2024-02-26 8:58 ` John Garry
2024-02-26 9:13 ` Ritesh Harjani
2024-02-26 9:46 ` John Garry
2024-02-26 8:51 ` John Garry
2024-02-19 13:01 ` [PATCH v4 04/11] fs: Add initial atomic write support info to statx John Garry
2024-02-19 22:28 ` Dave Chinner
2024-02-20 9:40 ` John Garry
2024-02-20 8:20 ` Christoph Hellwig
2024-02-20 9:01 ` John Garry
2024-02-24 18:46 ` Ritesh Harjani
2024-02-26 9:07 ` John Garry
2024-02-19 13:01 ` [PATCH v4 05/11] block: Add core atomic write support John Garry
2024-02-19 22:58 ` Dave Chinner
2024-02-20 8:22 ` Christoph Hellwig
2024-02-20 10:01 ` John Garry
2024-02-25 12:09 ` Ritesh Harjani
2024-02-25 12:21 ` Ritesh Harjani [this message]
2024-02-26 9:23 ` John Garry
2024-02-19 13:01 ` [PATCH v4 06/11] block: Add atomic write support for statx John Garry
2024-02-20 8:29 ` Christoph Hellwig
2024-02-20 9:35 ` John Garry
2024-02-25 14:20 ` Ritesh Harjani
2024-02-26 9:36 ` John Garry
2024-02-19 13:01 ` [PATCH v4 07/11] block: Add fops atomic write support John Garry
2024-02-25 14:46 ` Ritesh Harjani
2024-02-26 9:46 ` John Garry
2024-02-19 13:01 ` [PATCH v4 08/11] scsi: sd: Atomic " John Garry
2024-02-19 13:01 ` [PATCH v4 09/11] scsi: scsi_debug: " John Garry
2024-02-20 7:12 ` Ojaswin Mujoo
2024-02-20 9:01 ` John Garry
2024-02-19 13:01 ` [PATCH v4 10/11] nvme: " John Garry
2024-02-19 19:21 ` Keith Busch
2024-02-20 6:55 ` Christoph Hellwig
2024-02-20 8:19 ` John Garry
2024-02-20 8:31 ` Christoph Hellwig
2024-02-20 8:50 ` John Garry
2024-02-19 13:01 ` [PATCH v4 11/11] nvme: Ensure atomic writes will be executed atomically John Garry
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