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-rw-r--r--fs/btrfs/tree-mod-log.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/fs/btrfs/tree-mod-log.h b/fs/btrfs/tree-mod-log.h
new file mode 100644
index 000000000..12605d196
--- /dev/null
+++ b/fs/btrfs/tree-mod-log.h
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#ifndef BTRFS_TREE_MOD_LOG_H
+#define BTRFS_TREE_MOD_LOG_H
+
+#include "ctree.h"
+
+/* Represents a tree mod log user. */
+struct btrfs_seq_list {
+ struct list_head list;
+ u64 seq;
+};
+
+#define BTRFS_SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
+#define BTRFS_SEQ_LAST ((u64)-1)
+
+enum btrfs_mod_log_op {
+ BTRFS_MOD_LOG_KEY_REPLACE,
+ BTRFS_MOD_LOG_KEY_ADD,
+ BTRFS_MOD_LOG_KEY_REMOVE,
+ BTRFS_MOD_LOG_KEY_REMOVE_WHILE_FREEING,
+ BTRFS_MOD_LOG_KEY_REMOVE_WHILE_MOVING,
+ BTRFS_MOD_LOG_MOVE_KEYS,
+ BTRFS_MOD_LOG_ROOT_REPLACE,
+};
+
+u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
+ struct btrfs_seq_list *elem);
+void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
+ struct btrfs_seq_list *elem);
+int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
+ struct extent_buffer *new_root,
+ bool log_removal);
+int btrfs_tree_mod_log_insert_key(struct extent_buffer *eb, int slot,
+ enum btrfs_mod_log_op op, gfp_t flags);
+int btrfs_tree_mod_log_free_eb(struct extent_buffer *eb);
+struct extent_buffer *btrfs_tree_mod_log_rewind(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path,
+ struct extent_buffer *eb,
+ u64 time_seq);
+struct extent_buffer *btrfs_get_old_root(struct btrfs_root *root, u64 time_seq);
+int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
+int btrfs_tree_mod_log_eb_copy(struct extent_buffer *dst,
+ struct extent_buffer *src,
+ unsigned long dst_offset,
+ unsigned long src_offset,
+ int nr_items);
+int btrfs_tree_mod_log_insert_move(struct extent_buffer *eb,
+ int dst_slot, int src_slot,
+ int nr_items);
+u64 btrfs_tree_mod_log_lowest_seq(struct btrfs_fs_info *fs_info);
+
+#endif