On Sun, May 30, 2021 at 12:56:36PM +0000, Sidong Yang wrote:

This patch appends num_stripes for each chunks in device usage commands.
It helps to see profiles easily. The output is like below.

/dev/vdb, ID: 1
   Device size:             1.00GiB
   Device slack:              0.00B
   Data,single[1]:        120.00MiB
   Metadata,DUP[2]:       102.38MiB
   System,DUP[2]:          16.00MiB
   Unallocated:           785.62MiB

This is example of single and dup, but the whole point was to print that
for the striped profiles, like is shown in the issue
https://github.com/kdave/btrfs-progs/issues/372 , so it needs to be
conditional.

As the mirrored profiles have a fixed number of copies, there's no doubt
on how many devices are printed, same for single and dup.

I'm more inclined to use the "/" as separator: 'RAID6/3' it's more like
"raid6 on three devices", the "[]" looks like indexing. "," is used as
separator of the type so it won't be as simple to parse that.