• Qu Wenruo's avatar
    btrfs: Introduce extent_io_tree::owner to distinguish different io_trees · 43eb5f29
    Qu Wenruo authored
    Btrfs has the following different extent_io_trees used:
    - fs_info::free_extents[2]
    - btrfs_inode::io_tree - for both normal inodes and the btree inode
    - btrfs_inode::io_failure_tree
    - btrfs_transaction::dirty_pages
    - btrfs_root::dirty_log_pages
    If we want to trace changes in those trees, it will be pretty hard to
    distinguish them.
    Instead of using hard-to-read pointer address, this patch will introduce
    a new member extent_io_tree::owner to track the owner.
    This modification needs all the callers of extent_io_tree_init() to
    accept a new parameter @owner.
    This patch provides the basis for later trace events.
    Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
    Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
    Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>