[Bug 14914] files are created as sparse files when they shouldn't

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=14914





--- Comment #28 from Nate <natrik at gmail.com>  2009-11-01 17:05:34 ---
THE NEXT STEP, it seems clear to me, is for someone interested and capable to
write and submit code to this page.

The code should produce a sequential, and (reasonably) contiguous file, that is
with bytes written mostly in order (with respect to disk blocks) within the
file's allocated space) in a current windows version on native windows
filesystem(s).  

The same code should produce a badly fragmented file (maybe initially allocated
sparsely?) with bytes written completely out of order (with respect to
allocated disk blocks) within the file's allocated space, when run through
current Wine under a current Linux on native Linux filesystem(s).

PERHAPS the code would allocate rather big files, and write randomly to them in
the same manner as uTorrent (which is incidentally not open source).

I really wish I could write this code myself.  I would already be enjoying
myself with the challenge.  I think I understand the concepts well enough, but
not the programming.

... 

While I do understand that the ROOT CAUSE is the lack of some "no_sparse"
somewhere IN LINUX, I also understand that, in this case, current Wine code
does not result in Windows-behavior end-result allocation (with respect to the
order of data on the disk).  Furthermore, I also understand that, lacking a
direct "not-sparse" allocation option in Linux, attempts to modify Wine for
this case could really screw up other programs' performance.  (And therefore
would probably be best implemented as a runtime switch, like --no-sparse or
--explicit-sparse).  

There seems no doubt by anyone here that it is a challenging issue from an
algorithmic perspective to align actual results with expected results, but it
clearly can be done, and I see no reason it can't be done in Wine.  After all,
if program function and system performance inconsistencies between Wine and
Windows is not "buggy" then surely I am misinformed on the purpose of Wine.

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