From 8bca55d1e75d23a6fbb942ebd0525e105b982d9b Mon Sep 17 00:00:00 2001
From: Jonas Malaco <jonas@protocubo.io>
Date: Mon, 15 Jan 2024 08:17:38 -0300
Subject: [PATCH] btrfs-progs: scrub status: only report limits if at least one
 exists

On multi-device filesystems, scrub status should report "some limits
set" if at least one device has a scrub limit set.

However, with btrfs-progs 6.6.3, this was being reported regardless of
whether any limit actually being set:

    # sudo btrfs scrub limit /more/butter
    UUID: 989129d9-c96f-4d52-9d68-cbb6d9b2c499
    Id  Limit       Path
    --  -----  ---------
     1      -  /dev/sdc1
     2      -  /dev/sdd1

    # sudo btrfs scrub status /more/butter/
    UUID:             989129d9-c96f-4d52-9d68-cbb6d9b2c499
    Scrub started:    Mon Jan 15 02:00:30 2024
    Status:           running
    Duration:         6:23:19
    Time left:        0:49:08
    ETA:              Mon Jan 15 09:12:57 2024
    Total to scrub:   9.83TiB
    Bytes scrubbed:   8.72TiB  (88.64%)
    Rate:             397.47MiB/s (some device limits set)
    Error summary:    no errors found

Fix it by only setting `limit` to the special marker value 1 if at least
one actual limit is found.

Pull-request: #733
Issue: #727
Fixes: 7e4a235df1ac ("btrfs-progs: scrub status: print device speed limit in status if set")
Signed-off-by: Jonas Malaco <jonas@protocubo.io>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 cmds/scrub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmds/scrub.c b/cmds/scrub.c
index acff1c0..3601713 100644
--- a/cmds/scrub.c
+++ b/cmds/scrub.c
@@ -387,7 +387,7 @@ static void print_fs_stat(struct scrub_fs_stat *fs_stat, int raw, u64 bytes_tota
 		 * Limit for the whole filesystem stats does not make sense,
 		 * but if there's any device with a limit then print it.
 		 */
-		if (nr_devices != 1)
+		if (nr_devices != 1 && limit)
 			limit = 1;
 		print_scrub_summary(&fs_stat->p, &fs_stat->s, bytes_total, limit);
 	}
-- 
2.27.0