Re: an interface for filesystem preallocation that doesn't suck?

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On 2009-04-02 at 17:00-0500 Eric Sandeen <sandeen@xxxxxxxxxx> wrote:

> James Ralston wrote:
> 
> > [I]s there an interface for fallocate() that doesn't have quite as
> > much FAIL as posix_fallocate()?
> 
> yes, plain ol' fallocate(2), I think:
> 
>        #include <linux/falloc.h>
> 
>        long fallocate(int fd, int mode, loff_t offset, loff_t len);
> 
> but you need a very recent glibc to get it:
> 
> http://sourceware.org/bugzilla/show_bug.cgi?id=7083#c1

Ah, that's the ticket (no pun intended).

> it'd be great if we could get that into F11...

The rawhide glibc has it, but I'm not sure if it made the cut for the
beta.  I'll test later.

> BTW, ext4, xfs, btrfs, and ocfs2 all support ->fallocate.

Yup.

On 2009-04-03 at 03:52+0530 Rahul Sundaram <sundaram@xxxxxxxxxxxxxxxxx> wrote:

> Shouldn't we getting the new glibc and file RFE's against RPM, the
> torrent clients etc?

I intend to start filing bugs against anything I can find that doesn't
use fallocate(), yes.  But I needed a better implementation to suggest
than posix_fallocate().

James

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