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btrfs: zoned: print unusable percentage when reclaiming block groups 

When we're automatically reclaiming a zone, because its zone_unusable
value is above the reclaim threshold, we're only logging how much
percent of the zone's capacity are used, but not how much of the
capacity is unusable.

Also print the percentage of the unusable space in the block group
before we're reclaiming it.

Example:

  BTRFS info (device sdg): reclaiming chunk 230686720 with 13% used 86% unusable

CC: stable@vger.kernel.org # 5.13
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2021-06-29 03:16:46 +09:00 committed by David Sterba
parent 54afaae34e
commit 5f93e776c6
1 changed files with 12 additions and 2 deletions
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14
fs/btrfs/block-group.c
View File

@ -1501,6 +1501,7 @@ void btrfs_reclaim_bgs_work(struct work_struct *work)
mutex_lock(&fs_info->reclaim_bgs_lock);
spin_lock(&fs_info->unused_bgs_lock);
while (!list_empty(&fs_info->reclaim_bgs)) {
u64 zone_unusable;
int ret = 0;
bg = list_first_entry(&fs_info->reclaim_bgs,
@ -1534,13 +1535,22 @@ void btrfs_reclaim_bgs_work(struct work_struct *work)
goto next;
}
/*
* Cache the zone_unusable value before turning the block group
* to read only. As soon as the blog group is read only it's
* zone_unusable value gets moved to the block group's read-only
* bytes and isn't available for calculations anymore.
*/
zone_unusable = bg->zone_unusable;
ret = inc_block_group_ro(bg, 0);
up_write(&space_info->groups_sem);
if (ret < 0)
goto next;
btrfs_info(fs_info, "reclaiming chunk %llu with %llu%% used",
bg->start, div64_u64(bg->used * 100, bg->length));
btrfs_info(fs_info,
"reclaiming chunk %llu with %llu%% used %llu%% unusable",
bg->start, div_u64(bg->used * 100, bg->length),
div64_u64(zone_unusable * 100, bg->length));
trace_btrfs_reclaim_block_group(bg);
ret = btrfs_relocate_chunk(fs_info, bg->start);
if (ret)