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()
Signed-off-by: Alex Tomas <alex@xxxxxxxxxxxxx>
Is this based on Christoph's work?
Christoph, or some other XFS hacker, already did generic delalloc,
modeled on the XFS delalloc code.
Jeff
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