Btrfs: add tree mod log to fs_info

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e0da6db..01639e1 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1129,6 +1129,15 @@ struct btrfs_fs_info {
        spinlock_t delayed_iput_lock;
        struct list_head delayed_iputs;
 
+       /* this protects tree_mod_seq_list */
+       spinlock_t tree_mod_seq_lock;
+       atomic_t tree_mod_seq;
+       struct list_head tree_mod_seq_list;
+
+       /* this protects tree_mod_log */
+       rwlock_t tree_mod_log_lock;
+       struct rb_root tree_mod_log;
+
        atomic_t nr_async_submits;
        atomic_t async_submit_draining;
        atomic_t nr_async_bios;

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index f433074..f51ad84 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1914,11 +1914,14 @@ int open_ctree(struct super_block *sb,
        spin_lock_init(&fs_info->delayed_iput_lock);
        spin_lock_init(&fs_info->defrag_inodes_lock);
        spin_lock_init(&fs_info->free_chunk_lock);
+       spin_lock_init(&fs_info->tree_mod_seq_lock);
+       rwlock_init(&fs_info->tree_mod_log_lock);
        mutex_init(&fs_info->reloc_mutex);
 
        init_completion(&fs_info->kobj_unregister);
        INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
        INIT_LIST_HEAD(&fs_info->space_info);
+       INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
        btrfs_mapping_init(&fs_info->mapping_tree);
        btrfs_init_block_rsv(&fs_info->global_block_rsv);
        btrfs_init_block_rsv(&fs_info->delalloc_block_rsv);
@@ -1931,12 +1934,14 @@ int open_ctree(struct super_block *sb,
        atomic_set(&fs_info->async_submit_draining, 0);
        atomic_set(&fs_info->nr_async_bios, 0);
        atomic_set(&fs_info->defrag_running, 0);
+       atomic_set(&fs_info->tree_mod_seq, 0);
        fs_info->sb = sb;
        fs_info->max_inline = 8192 * 1024;
        fs_info->metadata_ratio = 0;
        fs_info->defrag_inodes = RB_ROOT;
        fs_info->trans_no_join = 0;
        fs_info->free_chunk_space = 0;
+       fs_info->tree_mod_log = RB_ROOT;
 
        /* readahead state */
        INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);