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

[Paul Eggert]

On 01/08/2018 09:41 AM, Joerg Schilling wrote:
> POSIX explains that st_blocks counts in units of DEV_BSIZE.

That's not required by the standard. It's merely a comment in the 
<sys/stat.h> rationale "Traditionally, some implementations defined the 
multiplier for /st_blocks/ in /<sys/param.h>/ 
<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_param.h.html> 
as the symbol DEV_BSIZE." The rationale also says that the st_blocks 
unit may vary from file to file, and that there's no relationship 
between it and st_blksize.