[PATCH] idmap autorid extension to support rid greater than rangesize

[Abhidnya S Joshi]

Hi,

Please find attached patch for multiple range support in autorid idmap 
module. This patch applies to master branch. 
The autorid man page says:
"SIDs with RIDs larger than rangesize cannot be mapped, are ignored and 
the corresponding map is discarded. Choose this value carefully, as this 
should not be changed after the first ranges for domains have been 
defined, otherwise mappings between domains will get intermixed leading to 
unpredictable results. As the parameter cannot be changed later, please 
plan accordingly for your expected number of users in a domain with safety 
margins."

In production environment, it sometimes becomes difficult to plan max rid 
in advance and thus rangesize. With this patch, autorid module will be 
able to support rids larger than rangesize.(Provided range is available)

e.g. The existing method is ID = IDMAP UID LOW VALUE + DOMAINRANGENUMBER * 
RANGESIZE + RID

This patch will use ID = IDMAP UID LOW VALUE + DOMAINRANGENUMBER * 
RANGESIZE + RID – ( MULTIPLIER * RANGESIZE)
where Multiplier is an unsigned integer  which defines the number of 
ranges to skip while allocating a range. It is calculated by dividing 
incoming RID with RangeSize.

Note: This is just extension to autorid and will not hanmper existing 
functionality



Thanks and Regards
Abhidnya Joshi

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