linux-ext4 - Re: [RFC][PATCH 1/7]ext4: Add EXT4_IOC_ADD_GLOBAL_ALLOC

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Date:	Tue, 23 Jun 2009 20:02:55 -0400
From:	Greg Freemyer <greg.freemyer@...il.com>
To:	Andreas Dilger <adilger@....com>
Cc:	Akira Fujita <a-fujita@...jp.nec.com>, linux-ext4@...r.kernel.org,
	"Theodore Ts'o" <tytso@....edu>, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/7]ext4: Add EXT4_IOC_ADD_GLOBAL_ALLOC_RULE 
	restricts block allocation

On Tue, Jun 23, 2009 at 7:19 PM, Andreas Dilger<adilger@....com> wrote:
> On Jun 23, 2009  17:25 +0900, Akira Fujita wrote:
>> alloc_flag of ext4_alloc_rule structure is set as "mandatory" or "advisory".
>> Restricted blocks with "mandatory" are never used by block allocator.
>> But in "advisory" case, block allocator is allowed to use restricted blocks
>> when there are no free blocks on FS.
>
> Would it make more sense to implement the range protections via the
> existing preallocation ranges (PA)?  An inode can have multiple
> PAs attached to it to have it prefer allocations from that range.
>
> We could also attach PAs to the superblock to prevent other files from
> allocating out of those ranges.  This would work better with the existing
> allocation code instead of creating a second similar mechanism.
>
> Cheers, Andreas

Andreas,

Where can I find documentation about how PA works?  Or is it just in
the source?  If so, what are one or two calls that cause the PA ranges
to be set, etc.

Thanks
Greg
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