From: Chaitanya Kulkarni <chaitanyak@nvidia.com>
To: Christoph Hellwig <hch@lst.de>
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Chaitanya Kulkarni <chaitanyak@nvidia.com>
Subject: Re: [RFC PATCH 0/8] block: add support for REQ_OP_VERIFY
Date: Thu, 4 Nov 2021 09:27:50 +0000 [thread overview]
Message-ID: <661bcadd-a030-4a72-81ae-ef15080f0241@nvidia.com> (raw)
In-Reply-To: <20211104071439.GA21927@lst.de>
On 11/4/2021 12:14 AM, Christoph Hellwig wrote:
> External email: Use caution opening links or attachments
>
>
> What is the actual use case here?
>
One of the immediate use-case is to use this interface with XFS
scrubbing infrastructure [1] (by replacing any SCSI calls e.g. sg_io()
with BLKVERIFY ioctl() calls corresponding to REQ_OP_VERIFY) and
eventually allow and extend other file systems to use it for scrubbing.
[1] man xfs_scrub :-
-x Read all file data extents to look for disk errors.
xfs_scrub will issue O_DIRECT reads to the block device
directly. If the block device is a SCSI disk, it will
instead issue READ VERIFY commands directly to the disk.
If media errors are found, the error report will include
the disk offset, in bytes. If the media errors affect a
file, the report will also include the inode number and
file offset, in bytes. These actions will confirm that
all file data blocks can be read from storage.
next prev parent reply other threads:[~2021-11-04 9:27 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-04 6:46 [RFC PATCH 0/8] block: add support for REQ_OP_VERIFY Chaitanya Kulkarni
2021-11-04 6:46 ` [RFC PATCH 1/8] " Chaitanya Kulkarni
2021-11-04 17:25 ` Darrick J. Wong
2021-11-11 8:01 ` Chaitanya Kulkarni
2021-11-04 6:46 ` [RFC PATCH 2/8] scsi: add REQ_OP_VERIFY support Chaitanya Kulkarni
2021-11-04 12:33 ` Damien Le Moal
2021-11-11 8:07 ` Chaitanya Kulkarni
2021-11-04 6:46 ` [RFC PATCH 3/8] nvme: add support for the Verify command Chaitanya Kulkarni
2021-11-04 22:44 ` Keith Busch
2021-11-11 8:09 ` Chaitanya Kulkarni
2021-11-04 6:46 ` [PATCH 4/8] nvmet: add Verify command support for bdev-ns Chaitanya Kulkarni
2021-11-04 6:46 ` [RFC PATCH 5/8] nvmet: add Verify emulation " Chaitanya Kulkarni
2021-11-04 6:46 ` [RFC PATCH 6/8] nvmet: add verify emulation support for file-ns Chaitanya Kulkarni
2021-11-04 6:46 ` [RFC PATCH 7/8] null_blk: add REQ_OP_VERIFY support Chaitanya Kulkarni
2021-11-04 6:46 ` [RFC PATCH 8/8] md: add support for REQ_OP_VERIFY Chaitanya Kulkarni
2021-11-11 8:13 ` Chaitanya Kulkarni
2021-11-12 15:19 ` Mike Snitzer
2021-11-04 7:14 ` [RFC PATCH 0/8] block: " Christoph Hellwig
2021-11-04 9:27 ` Chaitanya Kulkarni [this message]
2021-11-04 17:32 ` Darrick J. Wong
2021-11-04 17:34 ` Christoph Hellwig
2021-11-04 22:37 ` Keith Busch
2021-11-05 8:25 ` javier
2021-11-11 8:18 ` Chaitanya Kulkarni
2021-11-04 15:16 ` Douglas Gilbert
2021-11-11 8:27 ` Chaitanya Kulkarni
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