btrfs: zoned: load active zone info for block group

Load activeness of underlying zones of a block group. When underlying zones
are active, we add the block group to the fs_info->zone_active_bgs list.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 614499a..942a347 100644 (file)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1170,6 +1170,7 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
        unsigned int nofs_flag;
        u64 *alloc_offsets = NULL;
        u64 *caps = NULL;
+       unsigned long *active = NULL;
        u64 last_alloc = 0;
        u32 num_sequential = 0, num_conventional = 0;
 
@@ -1214,6 +1215,12 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
                goto out;
        }
 
+       active = bitmap_zalloc(map->num_stripes, GFP_NOFS);
+       if (!active) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
        for (i = 0; i < map->num_stripes; i++) {
                bool is_sequential;
                struct blk_zone zone;
@@ -1297,8 +1304,16 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
                        /* Partially used zone */
                        alloc_offsets[i] =
                                        ((zone.wp - zone.start) << SECTOR_SHIFT);
+                       __set_bit(i, active);
                        break;
                }
+
+               /*
+                * Consider a zone as active if we can allow any number of
+                * active zones.
+                */
+               if (!device->zone_info->max_active_zones)
+                       __set_bit(i, active);
        }
 
        if (num_sequential > 0)
@@ -1346,6 +1361,7 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
                }
                cache->alloc_offset = alloc_offsets[0];
                cache->zone_capacity = caps[0];
+               cache->zone_is_active = test_bit(0, active);
                break;
        case BTRFS_BLOCK_GROUP_DUP:
        case BTRFS_BLOCK_GROUP_RAID1:
@@ -1361,6 +1377,13 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
                goto out;
        }
 
+       if (cache->zone_is_active) {
+               btrfs_get_block_group(cache);
+               spin_lock(&fs_info->zone_active_bgs_lock);
+               list_add_tail(&cache->active_bg_list, &fs_info->zone_active_bgs);
+               spin_unlock(&fs_info->zone_active_bgs_lock);
+       }
+
 out:
        if (cache->alloc_offset > fs_info->zone_size) {
                btrfs_err(fs_info,
@@ -1392,6 +1415,7 @@ out:
                kfree(cache->physical_map);
                cache->physical_map = NULL;
        }
+       bitmap_free(active);
        kfree(caps);
        kfree(alloc_offsets);
        free_extent_map(em);