trying to download on fat

[some1]

Whenever I try to download anything with rtorrent on a mounted fat32 fs, an error appears: "Caught exception: "Could not resize files"". With native (ext3) fs everything works fine. BTW, other torrent clients don't have this kind of problem.

[anonymous]

Could be due to libtorrent using ftruncate to resize files on disk (data/File::set_size())

 http://www.winehq.org/hypermail/wine-devel/2002/01/att-0500/01-FSERVER.TXT

Please fix.

[anonymous]

Updated doc about disk allocation.

[rakshasa]

A few days ago I implemented a work-around that uses lseek and write. The problem with this is that it blocks for a long time. I might make enabling this a compile time option, atleast until i've made a worker thread for dealing with various IO stuff.

[anonymous]

Or you can make libtorrent allocate disk space on demand like most other bittorrent clients. Allocate in the unit of Chunks when writing a fresh chunk will help to make the system more responsive.

Of course you can also cooperate the allocation into a timeout signal and allocate a small piece a time.

[rakshasa]

There are advantages and disadvantages to both methods of allocating, but I'm not going to let a vfat specific bug affect that. The problem here is that a file resize that should have taken O(1) time takes O(N) time on vfat due to a bug.

[anonymous]

From man ftruncate, it's not really a bug. Posix allows both behaviors when length is bigger than file size.

So resize can still use ftruncate, when ftruncate returns -1, a lseek based resize function could be called to perform a not so perfect resizing. On most Unix filesystem, O(1) will be ensured.

Still allocation on demand will have some advantage if libtorrent is ported to the evil OS in the future.

[rakshasa]

O(1) isn't ensured on vfat using linux-2.6.9. The lseek+write seems to require the whole file to be blanked by the kernel, rather than waiting until the pages are written to.

[anonymous]

vfat is not a "Unix filesystem".

[rakshasa]

Yet some people still mount vfat filesystems from unix. This bug is fixed in SVN, but does ATM block. I might improve this later.

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[karl]

Rtorrent? Do you mean rtorrent.com? I faced the same problem with one russian torrent, don't remember its name, but it was solved in an easy way. Please feel free to ask if anyone wants to know the solution.

[rakshasa]

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