[BUG]
For running scrubs, with v6.3 and newer btrfs-progs, it can report
incorrect "Total to scrub":
Scrub resumed: Mon Oct 9 11:28:33 2023
Status: running
Duration: 0:44:36
Time left: 0:00:00
ETA: Mon Oct 9 11:51:38 2023
Total to scrub: 625.49GiB
Bytes scrubbed: 625.49GiB (100.00%)
Rate: 239.35MiB/s
Error summary: no errors found
[CAUSE]
Commit c88ac0170b ("btrfs-progs: scrub: unify the output numbers for
"Total to scrub"") changed the output method for "Total to scrub", but
that value is only suitable for finished scrubs.
For running scrubs, if we use the currently scrubbed values, it would
lead to the above problem.
The real scrubbed bytes is only reliable for finished scrubs, not for
running/canceled/interrupted ones.
[FIX]
Change print_scrub_dev() to do extra checks, and only for finished
scrubs to use the scrubbed bytes.
Otherwise fall back to the device's bytes_used.
Issue: #690
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
660dd1ed71