Re: O_SYNC patches for 2.4.0-test1-ac11

Stephen C. Tweedie wrote:

No.  If we do posix_fallocate(), then there are only two choices:
we either pre-zero the file contents (in which case we are as well
doing it from user space), or we record in the inode that the file
isn't pre-zeroed and so optimise things.

3rd choice: preallocate space with room for interleaved indirection
blocks.  You don't need to record anything in the inode: it's the
indirection blocks that get changed as you fill up the file.  And
they're in exactly the right place.

-- Jamie
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