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eader.dragonflybsd.org> <45d98a2c$0$833$415eb37d at crater_reader.dragonflybsd.org> <200702192245.l1JMjH7a091153 at apollo.backplane.com> <45DA49B7.7000806 at exemail.com.au> <200702200711.l1K7B7n1094896 at apollo.backplane.com>
From: Robert Clark <Robert_Clark at mac.com>
Subject: Re: Plans for 1.8+ (2.0?)
Date: Wed, 21 Feb 2007 00:02:22 -0800
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Would file locking and range locking be handled separately?

On Feb 19, 2007, at 11:11 PM, Matthew Dillon wrote:

>
> :Hey Matt,
> :1) Does your filesystem plan include the ability to grow and shrink a
> :partition/volume? ie. /home is running out of space so we could run
> :"shrinkfs" ... on /usr which has a lot of space and "growfs" ...  
> on /home
>
>     The filesystem's backing store will be segmented.  Segment size  
> can
>     range from 1MB to 4GB (ish).  A 'partition' would be able to hold
>     multiple segments from the filesystem's point of view, but the  
> main
>     purpose of the segmentation is to create large, near-independant
>     blocks of data which can be dealt with on a segment-by-segment  
> basis
>     (e.g. for recovery, fsck/check, replication, growing, and  
> shrinking
>     purposes).

Having partition affinity would allow a LUN to be moved to a new  
host, and the vkernel moved along with it.

>     Segmentation also means the filesystem's backing store is not
>     restricted to a single block device but can be glued together
>     with several block devices, or even mixed-and-matched between
>     separate replicated data stores for recovery purposes.

Maybe we can pull in some iSCSI initiator code.

>     So, yes, it will be possible to grow or shrink the filesystem on
>     a segment-by-segment basis.
>
<snip>
> 					-Matt
> 					Matthew Dillon
> 					<dillon at backplane.com>