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From: Michael Tokarev <mjt@tls.msk.ru>
To: Michael Tokarev <mjt@tls.msk.ru>
Cc: Kay Sievers <kay.sievers@vrfy.org>,
	linux-kernel@vger.kernel.org, Greg KH <greg@kroah.com>
Subject: Re: /sys/block [was: [PATCH 007 of 7] md: Get name for block	device in sysfs]
Date: Mon, 17 Dec 2007 12:13:05 +0300	[thread overview]
Message-ID: <47663DA1.6000204@msgid.tls.msk.ru> (raw)
In-Reply-To: <47663431.8000603@msgid.tls.msk.ru>

Michael Tokarev wrote:
> Kay Sievers wrote:
>> On Mon, 2007-12-17 at 08:29 +0300, Michael Tokarev wrote:
> []
>>> How to distinguish char devices from block devices in sysfs?
>>> Is the only way to read a symlink `subsystem' in the device
>>> directory?
>> By its subsystem value (block), from the symlink, from the environment,
>> or from $1.
> 
> Environment and $1 comes as arguments for hotplug helper, not
> when scanning /sys/.

By the way, that's one of reasons I asked about useful content
in uevent files (but failed to provide a patch so far ;).
In 2.6.23, those files ARE readable finally, but doesn't
contain much info yet.

/mjt

      reply	other threads:[~2007-12-17  9:13 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-14  6:26 [PATCH 000 of 7] md: Introduction EXPLAIN PATCH SET HERE NeilBrown
2007-12-14  6:26 ` NeilBrown
2007-12-14  6:26 ` [PATCH 001 of 7] md: Support 'external' metadata for md arrays NeilBrown
2007-12-25 22:03   ` Andrew Morton
2007-12-14  6:26 ` [PATCH 002 of 7] md: Give userspace control over removing failed devices when external metdata in use NeilBrown
2007-12-14  6:26 ` [PATCH 003 of 7] md: Allow a maximum extent to be set for resyncing NeilBrown
2007-12-14  6:26 ` [PATCH 004 of 7] md: Allow devices to be shared between md arrays NeilBrown
2007-12-25 22:04   ` Andrew Morton
2007-12-14  6:26 ` [PATCH 005 of 7] md: Lock address when changing attributes of component devices NeilBrown
2007-12-14  6:26 ` [PATCH 006 of 7] md: Allow an md array to appear with 0 drives if it has external metadata NeilBrown
2007-12-14  6:26 ` [PATCH 007 of 7] md: Get name for block device in sysfs NeilBrown
2007-12-14  6:26   ` NeilBrown
2007-12-15 16:58   ` Kay Sievers
2007-12-16 22:43     ` Neil Brown
2007-12-17  2:10       ` Kay Sievers
2007-12-17  5:29         ` /sys/block [was: [PATCH 007 of 7] md: Get name for block device in sysfs] Michael Tokarev
2007-12-17  8:24           ` Kay Sievers
2007-12-17  8:32             ` Michael Tokarev
2007-12-17  9:13               ` Michael Tokarev [this message]

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