Should DEV_BSIZE be defined?

[Jeff Johnson]

The <sys/stat.h> description in POSIX contains the following wording:

"The unit for the st_blocks member of the stat structure is not defined within
POSIX.1-200x. In some implementations it is 512 bytes. It may differ on a file
system basis. There is no correlation between values of the st_blocks and
st_blksize, and the f_bsize (from <sys/statvfs.h>) structure members.

Traditionally, some implementations defined the multiplier for st_blocks in
<sys/param.h> as the symbol DEV_BSIZE."

In case of LSB, will it be safe to define DEV_BSIZE to 512, as it is done in
glibc?

Note also that glibc headers provide S_BLKSIZE constant which has the same
meaning (and seems to historically come from BSD).