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

wine-bugs at winehq.org wine-bugs at winehq.org
Wed Aug 20 02:13:20 CDT 2008


--- Comment #4 from Marcus Blomenkamp <mblomenk at gmx.de>  2008-08-20 02:13:20 ---
> Basically creating a file with requested size.

Yes exactly. But as long as you haven't written any data to it, it is a
sparsefile. Running the same sequence of CreateFile,SetFilePointer,SetEOF under
Windows also result in creating a file with requested size, however not as

My problem with sparsefiles are pressing in a particular application which
creates several files of certain size in advance, and then later on writes data
into them. Under Unix it results in severe fragmentation but under Windows it
doesn't and all is fine.

Of course the Windows application _could_ initialize the files by writing
sequentially up to the requested size. However it doesn't because it relies on
the Windows API specification that says that the above sequence is enough to
get a fully allocated file.

Windows creates sparse files/segments/blocks only when explicitly asked for.
And this is a major difference to how Unix handles sparse
files/segments/blocks. This difference should be accounted and handled in Wine
IMHO. I do not have access to the application source code so changing it to
work around Wine is not an option sadly.

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