linux-kernel - Re: What still uses the block layer?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0710161238140.6995@asgard.lang.hm>
Date:	Tue, 16 Oct 2007 12:54:58 -0700 (PDT)
From:	david@...g.hm
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Matthew Wilcox <matthew@....cx>, Rob Landley <rob@...dley.net>,
	David Newall <david@...idnewall.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Nick Piggin <piggin@...erone.com.au>
Subject: Re: What still uses the block layer?

On Tue, 16 Oct 2007, Alan Cox wrote:

>>> /dev/sd-ide-b	- second IDE HDD,
>>> /dev/sr-sata-0	- first SATA CD-ROM,
>
> I wouldn't try dividing those by pata v sata. You'll cause all sorts of
> problems in the process because of PATA-SATA and SATA-PATA bridges.

if you use a PATA-SATA bridge (IDE drive SATA controller), it would look 
to the system like a SATA drive and be addressed and enumerated as SATA.

if you use a SATA-PATA bridge (SATA drive, PATA controller), it would look 
to the system like a PATA drive and be addressed and enumerated as PATA. 
prior to libata the device would be /dev/hdX, with X depending on how it's 
cabled and if it's set to master or slave, it wouldn't matter if that 
device then converts to other things, the system would still know it as an 
IDE drive.

this works exactly the same way that external encosures that hold SATA or 
IDE drives, but have SCSI interfaces to the system have always worked so 
it's what sysadmins will expect.

David Lang
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/