From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Lee Duncan <lduncan@suse.com>
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
Tejun Heo <tj@kernel.org>, Hannes Reinecke <hare@suse.com>,
Johannes Thumshirn <jthumshirn@suse.de>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no management
Date: Wed, 14 Oct 2015 06:55:04 -0700 [thread overview]
Message-ID: <1444830904.2220.28.camel@HansenPartnership.com> (raw)
In-Reply-To: <f89fe3933ae899dc01f2eddd2a0cefac3383cf3c.1444241058.git.lduncan@suse.com>
On Wed, 2015-10-07 at 16:51 -0700, Lee Duncan wrote:
> Update the SCSI hosts module to use the ida_simple*() routines
> to manage its host_no index instead of an ATOMIC integer. This
> means that the SCSI host number will now be reclaimable.
OK, but why would we want to do this? We do it for sd because our minor
space for the device nodes is very constrained, so packing is essential.
For HBAs, there's no device space density to worry about, they're
largely statically allocated at boot time and not reusing the numbers
allows easy extraction of hotplug items for the logs (quite useful for
USB) because each separate hotplug has a separate and monotonically
increasing host number.
James
next prev parent reply other threads:[~2015-10-14 13:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-07 23:51 [PATCHv4 0/1] Update SCSI hosts to use ida for host number mgmt Lee Duncan
2015-10-07 23:51 ` [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no management Lee Duncan
2015-10-14 12:22 ` Johannes Thumshirn
2015-10-14 13:55 ` James Bottomley [this message]
2015-10-14 18:34 ` Lee Duncan
2015-10-14 18:53 ` James Bottomley
2015-10-14 21:21 ` Lee Duncan
2015-10-15 5:52 ` Hannes Reinecke
2015-10-16 20:03 ` Lee Duncan
2015-10-16 20:03 ` Lee Duncan
2015-10-16 20:14 ` Greg KH
2015-10-16 20:14 ` Greg KH
2015-11-12 16:31 ` Lee Duncan
2015-11-13 21:54 ` Martin K. Petersen
2015-11-16 12:10 ` Hannes Reinecke
2015-11-16 21:47 ` Lee Duncan
2015-11-17 23:20 ` Martin K. Petersen
2015-12-10 21:48 ` Lee Duncan
2015-12-11 15:31 ` Ewan Milne
2015-12-13 19:16 ` Lee Duncan
2015-12-14 15:07 ` Ewan Milne
2015-12-14 15:29 ` Hannes Reinecke
2015-12-14 15:29 ` Hannes Reinecke
2015-12-15 1:55 ` Martin K. Petersen
2015-12-17 19:24 ` Lee Duncan
2016-01-04 19:45 ` Lee Duncan
2016-01-05 23:53 ` Martin K. Petersen
2016-01-20 19:49 ` Lee Duncan
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