From dcdf7f6ddba006f3482ebee73dfa6b75aec5f07b Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 2 Mar 2015 16:37:31 -0500 Subject: [PATCH] Btrfs: prepare block group cache before writing Writing the block group cache will modify the extent tree quite a bit because it truncates the old space cache and pre-allocates new stuff. To try and cut down on the churn lets do the setup dance first, then later on hopefully we can avoid looping with newly dirtied roots. Thanks, Signed-off-by: Josef Bacik --- fs/btrfs/ctree.h | 2 ++ fs/btrfs/extent-tree.c | 26 ++++++++++++++++++++++++++ fs/btrfs/transaction.c | 5 ++++- 3 files changed, 32 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index b3dd55f52f71..a0c90a324f53 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3386,6 +3386,8 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, struct btrfs_root *root); +int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, + struct btrfs_root *root); int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); int btrfs_free_block_groups(struct btrfs_fs_info *info); int btrfs_read_block_groups(struct btrfs_root *root); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 96c613bfe157..3ac3fefb1625 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3325,6 +3325,32 @@ out: return ret; } +int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + struct btrfs_block_group_cache *cache, *tmp; + struct btrfs_transaction *cur_trans = trans->transaction; + struct btrfs_path *path; + + if (list_empty(&cur_trans->dirty_bgs) || + !btrfs_test_opt(root, SPACE_CACHE)) + return 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + /* Could add new block groups, use _safe just in case */ + list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs, + dirty_list) { + if (cache->disk_cache_state == BTRFS_DC_CLEAR) + cache_save_setup(cache, trans, path); + } + + btrfs_free_path(path); + return 0; +} + int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, struct btrfs_root *root) { diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 2fe3ef5e9de3..932709af5163 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -1025,7 +1025,6 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans, struct btrfs_root *tree_root = root->fs_info->tree_root; old_root_used = btrfs_root_used(&root->root_item); - btrfs_write_dirty_block_groups(trans, root); while (1) { old_root_bytenr = btrfs_root_bytenr(&root->root_item); @@ -1085,6 +1084,10 @@ static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, if (ret) return ret; + ret = btrfs_setup_space_cache(trans, root); + if (ret) + return ret; + /* run_qgroups might have added some more refs */ ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); if (ret) -- 2.34.1