btrfs: zoned: allow disabling of zone auto reclaim
Automatically reclaiming dirty zones might not always be desired for all
workloads, especially as there are currently still some rough edges with
the relocation code on zoned filesystems.
Allow disabling zone auto reclaim on a per filesystem basis by writing 0
as the threshold value.
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 8eeb652..e91440b 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2538,6 +2538,7 @@ static int __btrfs_add_free_space_zoned(struct btrfs_block_group *block_group,
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
u64 offset = bytenr - block_group->start;
u64 to_free, to_unusable;
+ const int bg_reclaim_threshold = READ_ONCE(fs_info->bg_reclaim_threshold);
spin_lock(&ctl->tree_lock);
if (!used)
@@ -2567,9 +2568,9 @@ static int __btrfs_add_free_space_zoned(struct btrfs_block_group *block_group,
/* All the region is now unusable. Mark it as unused and reclaim */
if (block_group->zone_unusable == block_group->length) {
btrfs_mark_bg_unused(block_group);
- } else if (block_group->zone_unusable >=
- div_factor_fine(block_group->length,
- fs_info->bg_reclaim_threshold)) {
+ } else if (bg_reclaim_threshold &&
+ block_group->zone_unusable >=
+ div_factor_fine(block_group->length, bg_reclaim_threshold)) {
btrfs_mark_bg_to_reclaim(block_group);
}