Re: [Bug-tar] Detection of sparse files is broken on btrfs

[Joerg Schilling]

Mark H Weaver <address@hidden> wrote:

> >>   https://lists.gnu.org/archive/html/bug-tar/2016-07/msg00000.html
> >>
> >> At the time, Joerg Schilling unilaterally refused to fix the bug,
> >> claiming that Btrfs was broken and violated POSIX, although when asked
> >> for a reference to back that up he never provided one.  Everyone else in
> >> the thread disagreed with him, but the bug never got fixed.
> >
> > Of course I provided that reference by pointing to the POSIX standard.
>
> Please quote the relevant excerpts regarding the constraints on
> st_blocks in relation to the file contents, along with links to the
> official online text containing those excerpts.

I did this 18 months ago already....

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_stat.h.html

blkcnt_t st_blocks      Number of blocks allocated for this object. 

I hope I do not need to explain the term "allocated".

Jörg

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