Re: [RFC] basic delayed allocation in VFS

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Alex Tomas wrote:
Good day,

please review ...

thanks, Alex


basic delayed allocation in VFS:

 * block_prepare_write() can be passed special ->get_block() which
   doesn't allocate blocks, but reserve them and mark bh delayed
 * a filesystem can use mpage_da_writepages() with other ->get_block()
   which doesn't defer allocation. mpage_da_writepages() finds all
   non-allocated blocks and try to allocate them with minimal calls
   to ->get_block(), then submit IO using __mpage_writepage()


I missed this patch when looking at the ext4 patches. Can we mark related
patch as [ PATCH 1/2 ] so that we know that another patch is going to follow.

-aneesh
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