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From: Johannes Thumshirn <jthumshirn@suse.de>
To: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>,
	linux-nvme@lists.infradead.org
Cc: linux-block@vger.kernel.org, Jens Axboe <axboe@fb.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 0/4] nvme multipath: expose slaves/holders
Date: Thu, 13 Dec 2018 10:33:13 +0100	[thread overview]
Message-ID: <bd4405c7-560c-f138-78f0-023807f96367@suse.de> (raw)
In-Reply-To: <20181206164812.30925-1-cascardo@canonical.com>

On 06/12/2018 17:48, Thadeu Lima de Souza Cascardo wrote:
> Exposing slaves/holders is necessary in order to find out the real PCI device
> and its driver for the root filesystem when generating an initramfs with
> initramfs-tools. That fails right now for nvme multipath devices, which this
> patchset fixes.
> 
> However, because the slave devices are hidden, lsblk fails without some extra
> patches, as it can't find the device numbers for the slave devices, and exits.

Sorry for chiming in so late, can someone give me an explanation what
actually is broken?

I know this is technically a user visible regression, but isn't lsblk
(and others) already fixed? I believe it's [1] in util-linux.

And to find out the PCI device, why do you need slaves/holders here?
Have a look at blktest's _get_pci_dev_from_blkdev() function [2].

[1] d51f05bfecb2 ("lsblk: try device/dev to read devno")
[2] https://github.com/osandov/blktests/blob/master/common/rc#L185

Byte,
	Johannes
-- 
Johannes Thumshirn                            SUSE Labs Filesystems
jthumshirn@suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

WARNING: multiple messages have this Message-ID (diff)
From: jthumshirn@suse.de (Johannes Thumshirn)
Subject: [PATCH 0/4] nvme multipath: expose slaves/holders
Date: Thu, 13 Dec 2018 10:33:13 +0100	[thread overview]
Message-ID: <bd4405c7-560c-f138-78f0-023807f96367@suse.de> (raw)
In-Reply-To: <20181206164812.30925-1-cascardo@canonical.com>

On 06/12/2018 17:48, Thadeu Lima de Souza Cascardo wrote:
> Exposing slaves/holders is necessary in order to find out the real PCI device
> and its driver for the root filesystem when generating an initramfs with
> initramfs-tools. That fails right now for nvme multipath devices, which this
> patchset fixes.
> 
> However, because the slave devices are hidden, lsblk fails without some extra
> patches, as it can't find the device numbers for the slave devices, and exits.

Sorry for chiming in so late, can someone give me an explanation what
actually is broken?

I know this is technically a user visible regression, but isn't lsblk
(and others) already fixed? I believe it's [1] in util-linux.

And to find out the PCI device, why do you need slaves/holders here?
Have a look at blktest's _get_pci_dev_from_blkdev() function [2].

[1] d51f05bfecb2 ("lsblk: try device/dev to read devno")
[2] https://github.com/osandov/blktests/blob/master/common/rc#L185

Byte,
	Johannes
-- 
Johannes Thumshirn                            SUSE Labs Filesystems
jthumshirn at suse.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: Felix Imend?rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N?rnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850

  parent reply	other threads:[~2018-12-13  9:33 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-06 16:48 [PATCH 0/4] nvme multipath: expose slaves/holders Thadeu Lima de Souza Cascardo
2018-12-06 16:48 ` Thadeu Lima de Souza Cascardo
2018-12-06 16:48 ` [PATCH 1/4] block: move holder tracking from struct block_device to hd_struct Thadeu Lima de Souza Cascardo
2018-12-06 16:48   ` Thadeu Lima de Souza Cascardo
2018-12-13  9:14   ` Hannes Reinecke
2018-12-13  9:14     ` Hannes Reinecke
2018-12-06 16:48 ` [PATCH 2/4] nvme: create slaves/holder entries for multipath devices Thadeu Lima de Souza Cascardo
2018-12-06 16:48   ` Thadeu Lima de Souza Cascardo
2018-12-13  9:15   ` Hannes Reinecke
2018-12-13  9:15     ` Hannes Reinecke
2018-12-06 16:48 ` [PATCH 3/4] nvme: Should not warn when a disk path is opened Thadeu Lima de Souza Cascardo
2018-12-06 16:48   ` Thadeu Lima de Souza Cascardo
2018-12-13  9:16   ` Hannes Reinecke
2018-12-13  9:16     ` Hannes Reinecke
2018-12-06 16:48 ` [PATCH 4/4] block: expose devt for GENHD_FL_HIDDEN disks Thadeu Lima de Souza Cascardo
2018-12-06 16:48   ` Thadeu Lima de Souza Cascardo
2018-12-06 20:22   ` Christoph Hellwig
2018-12-06 20:22     ` Christoph Hellwig
2018-12-12  8:32     ` Christoph Hellwig
2018-12-12  8:32       ` Christoph Hellwig
2018-12-12 12:39     ` Thadeu Lima de Souza Cascardo
2018-12-12 12:39       ` Thadeu Lima de Souza Cascardo
2018-12-13  9:18   ` Hannes Reinecke
2018-12-13  9:18     ` Hannes Reinecke
2018-12-13 11:41     ` Thadeu Lima de Souza Cascardo
2018-12-13 11:41       ` Thadeu Lima de Souza Cascardo
2018-12-13 12:19       ` Hannes Reinecke
2018-12-13 12:19         ` Hannes Reinecke
2018-12-13 16:08         ` Thadeu Lima de Souza Cascardo
2018-12-13 16:08           ` Thadeu Lima de Souza Cascardo
2018-12-13 14:32     ` Christoph Hellwig
2018-12-13 14:32       ` Christoph Hellwig
2018-12-13 15:25       ` Thadeu Lima de Souza Cascardo
2018-12-13 15:25         ` Thadeu Lima de Souza Cascardo
2018-12-13 20:20         ` Christoph Hellwig
2018-12-13 20:20           ` Christoph Hellwig
2018-12-13 21:00           ` Thadeu Lima de Souza Cascardo
2018-12-13 21:00             ` Thadeu Lima de Souza Cascardo
2018-12-14  7:47         ` Hannes Reinecke
2018-12-14  7:47           ` Hannes Reinecke
2018-12-14  8:56           ` Thadeu Lima de Souza Cascardo
2018-12-14  8:56             ` Thadeu Lima de Souza Cascardo
2018-12-14  9:06             ` Thadeu Lima de Souza Cascardo
2018-12-14  9:06               ` Thadeu Lima de Souza Cascardo
2018-12-14  9:54               ` Hannes Reinecke
2018-12-14  9:54                 ` Hannes Reinecke
2018-12-14 10:18                 ` Hannes Reinecke
2018-12-14 10:18                   ` Hannes Reinecke
2018-12-14 11:09                 ` Thadeu Lima de Souza Cascardo
2018-12-14 11:09                   ` Thadeu Lima de Souza Cascardo
2018-12-14  9:44             ` Hannes Reinecke
2018-12-14  9:44               ` Hannes Reinecke
2018-12-13  9:33 ` Johannes Thumshirn [this message]
2018-12-13  9:33   ` [PATCH 0/4] nvme multipath: expose slaves/holders Johannes Thumshirn
2018-12-13 11:35   ` Thadeu Lima de Souza Cascardo
2018-12-13 11:35     ` Thadeu Lima de Souza Cascardo

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