btrfs: factor out release_block_group()

Factor out release_block_group() from find_free_extent(). This function
is called when it gives up an allocation from a block group. Each
allocation policy should reset its information for an allocation in
the next block group.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 93d5b5c48185a3a55a4ff1647d2ecb402c4f6047..6d4f53e92833090d68ae47915a39722fa7db60a0 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3693,6 +3693,24 @@ static int do_allocation(struct btrfs_block_group *block_group,
        }
 }
 
+static void release_block_group(struct btrfs_block_group *block_group,
+                               struct find_free_extent_ctl *ffe_ctl,
+                               int delalloc)
+{
+       switch (ffe_ctl->policy) {
+       case BTRFS_EXTENT_ALLOC_CLUSTERED:
+               ffe_ctl->retry_clustered = false;
+               ffe_ctl->retry_unclustered = false;
+               break;
+       default:
+               BUG();
+       }
+
+       BUG_ON(btrfs_bg_flags_to_raid_index(block_group->flags) !=
+              ffe_ctl->index);
+       btrfs_release_block_group(block_group, delalloc);
+}
+
 /*
  * Return >0 means caller needs to re-search for free extent
  * Return 0 means we have the needed free extent.
@@ -4069,11 +4087,7 @@ have_block_group:
                btrfs_release_block_group(block_group, delalloc);
                break;
 loop:
-               ffe_ctl.retry_clustered = false;
-               ffe_ctl.retry_unclustered = false;
-               BUG_ON(btrfs_bg_flags_to_raid_index(block_group->flags) !=
-                      ffe_ctl.index);
-               btrfs_release_block_group(block_group, delalloc);
+               release_block_group(block_group, &ffe_ctl, delalloc);
                cond_resched();
        }
        up_read(&space_info->groups_sem);