an interface for filesystem preallocation that doesn't suck?
Eric Sandeen
sandeen at redhat.com
Thu Apr 2 22:37:00 UTC 2009
Eric Sandeen wrote:
> Rahul Sundaram wrote:
>> Eric Sandeen wrote:
>>> James Ralston wrote:
>>>
>>>> If the latter, is 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
>>>
>>> it'd be great if we could get that into F11...
>>>
>>> BTW, ext4, xfs, btrfs, and ocfs2 all support ->fallocate.
>> Shouldn't we getting the new glibc and file RFE's against RPM, the
>> torrent clients etc?
>
> Ah, just checked and it's already in our rawhide glibc, yay :) didn't
> realize that.
>
> http://sandeen.fedorapeople.org/utilities/fallocate.c
>
> is a simple tool to exercise it, FWIW.
oh and (sorry for the spam)
http://sandeen.fedorapeople.org/utilities/fiemap-test-new.c
is a tool which can help show you the resulting file layout.
It needs fiemap.h which only recently started getting packaged up in
kernel-headers.
-Eric
More information about the fedora-devel-list
mailing list