diff options
| -rw-r--r-- | fs/btrfs/block-rsv.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/fs/btrfs/block-rsv.c b/fs/btrfs/block-rsv.c index 21ac60ec19f6..b3086f252ad0 100644 --- a/fs/btrfs/block-rsv.c +++ b/fs/btrfs/block-rsv.c @@ -352,25 +352,29 @@ void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info) { struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; struct btrfs_space_info *sinfo = block_rsv->space_info; - struct btrfs_root *extent_root = btrfs_extent_root(fs_info, 0); - struct btrfs_root *csum_root = btrfs_csum_root(fs_info, 0); - u64 num_bytes; - unsigned min_items; + struct btrfs_root *root, *tmp; + u64 num_bytes = btrfs_root_used(&fs_info->tree_root->root_item); + unsigned int min_items = 1; /* * The global block rsv is based on the size of the extent tree, the * checksum tree and the root tree. If the fs is empty we want to set * it to a minimal amount for safety. + * + * We also are going to need to modify the minimum of the tree root and + * any global roots we could touch. */ - num_bytes = btrfs_root_used(&extent_root->root_item) + - btrfs_root_used(&csum_root->root_item) + - btrfs_root_used(&fs_info->tree_root->root_item); - - /* - * We at a minimum are going to modify the csum root, the tree root, and - * the extent root. - */ - min_items = 3; + read_lock(&fs_info->global_root_lock); + rbtree_postorder_for_each_entry_safe(root, tmp, &fs_info->global_root_tree, + rb_node) { + if (root->root_key.objectid == BTRFS_EXTENT_TREE_OBJECTID || + root->root_key.objectid == BTRFS_CSUM_TREE_OBJECTID || + root->root_key.objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) { + num_bytes += btrfs_root_used(&root->root_item); + min_items++; + } + } + read_unlock(&fs_info->global_root_lock); /* * But we also want to reserve enough space so we can do the fallback |