Btrfs: clear all space_info->full after removing a block group

Btrfs allocates individual extents from block groups, and each
block group has a specific type.  It may hold metadata, data
mirrored or striped etc.

When we balance space (btrfs-vol -b) or remove a drive (btrfs-vol -r)
we free block groups.  Once a block group is freed, the space it was
using on the device may be available for use by new block groups.

btrfs_remove_block_group was clearing the flag that said
'our devices are full, don't even try to allocate new block groups',
but it was only clearing that flag for a specific type of block group.

This commit clears the full flag for all of the types of block groups,
making it much more likely that we'll be able to balance space when
the drive is close to full.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9a489cc89fd3ab0b44487c00f26d41b6f32f37ca..508df5f7d2ea18fc0419651340710120d127f337 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7486,7 +7486,8 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
        block_group->space_info->total_bytes -= block_group->key.offset;
        block_group->space_info->bytes_readonly -= block_group->key.offset;
        spin_unlock(&block_group->space_info->lock);
-       block_group->space_info->full = 0;
+
+       btrfs_clear_space_info_full(root->fs_info);
 
        btrfs_put_block_group(block_group);
        btrfs_put_block_group(block_group);