On Tue, Jun 23, 2009 at 7:19 PM, Andreas Dilger<adilger@xxxxxxx> 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 -- Greg Freemyer Head of EDD Tape Extraction and Processing team Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
