[stgt] [PATCH 0/5] Add dynamic redirection capability

FUJITA Tomonori fujita.tomonori at lab.ntt.co.jp
Wed Sep 22 12:13:24 CEST 2010

On Mon, 20 Sep 2010 18:40:51 -0700
Chandra Seetharaman <sekharan at us.ibm.com> wrote:

> Hello All,
> ----------------
> This is a resend of the patches sent on 09/17/2010:
> 		http://lists.wpkg.org/pipermail/stgt/2010-September/004108.html
> which was a resend of the patches sent on 09/01/2010:
> 		http://lists.wpkg.org/pipermail/stgt/2010-September/004082.html
> I added changes based on Tomo's suggestions.
> ----------------
> Currently, when a initiator tries to login to a target it can be redirected
> to a different portal. But, Redirect portal is static. i.e the user has to
> define the redirect portal for a target and _all_ the login requests for that
> target will be redirected to the specified portal.
> In order to provide load balancing capability, it will be better to have
> "dynamic redirection". This is envisioned as:
> 	- user defines an external program that takes initiator's address
> 	  (in ipv4 or ipv6 format)
> 	- user defines a "RedirectCallback" parameter for a target
> 	  # tgtadm --op update --mode target --tid 1 --name RedirectCallback \
> 						--value /usr/local/bin/redirect
> 	- When a initiator tries to login to target tid, user defined program
> 	  will be invoked with the target name and the initiator's ip address
> 	  and it is expected to return a triplet defining the
> 	  redirect portal, in the format of
> 		"string_addr:string_port:string_reason"
> 	  example: "" or
> 			"[fe80::214:5eff:acaf:c844]:860:Temporary"
> 	- Initiator will be redirected to the portal returned by the user
> 	  defined program.
> Following set of patches provide the feature. Please review and provide your
> comments.

Looks fine, applied.

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