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btrfs-progs: block-group: add rb-tree related memebers 

To convert from existing extent_cache to plain rb_tree, add
btrfs_block_group_cache::cache_node and
btrfs_fs_info::block_group_cache_tree.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Su Yue <Damenly_Su@gmx.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue 2019-12-18 13:18:41 +08:00 committed by David Sterba
parent 764c8dea72
commit 2eaf862f46
2 changed files with 14 additions and 9 deletions
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21
ctree.h
View File

@ -1111,16 +1111,18 @@ struct btrfs_block_group_cache {
int cached; int cached;
int ro; int ro;
/* /*
* If the free space extent count exceeds this number, convert the block * If the free space extent count exceeds this number, convert the block
* group to bitmaps. * group to bitmaps.
*/ */
u32 bitmap_high_thresh; u32 bitmap_high_thresh;
/* /*
* If the free space extent count drops below this number, convert the * If the free space extent count drops below this number, convert the
* block group back to extents. * block group back to extents.
*/ */
u32 bitmap_low_thresh; u32 bitmap_low_thresh;
/* Block group cache stuff */
struct rb_node cache_node;
}; };
struct btrfs_device; struct btrfs_device;
@ -1150,6 +1152,7 @@ struct btrfs_fs_info {
struct extent_io_tree extent_ins; struct extent_io_tree extent_ins;
struct extent_io_tree *excluded_extents; struct extent_io_tree *excluded_extents;
struct rb_root block_group_cache_tree;
/* logical->physical extent mapping */ /* logical->physical extent mapping */
struct btrfs_mapping_tree mapping_tree; struct btrfs_mapping_tree mapping_tree;

2
disk-io.c
View File

@ -797,6 +797,8 @@ struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
extent_io_tree_init(&fs_info->block_group_cache); extent_io_tree_init(&fs_info->block_group_cache);
extent_io_tree_init(&fs_info->pinned_extents); extent_io_tree_init(&fs_info->pinned_extents);
extent_io_tree_init(&fs_info->extent_ins); extent_io_tree_init(&fs_info->extent_ins);
fs_info->block_group_cache_tree = RB_ROOT;
fs_info->excluded_extents = NULL; fs_info->excluded_extents = NULL;
fs_info->fs_root_tree = RB_ROOT; fs_info->fs_root_tree = RB_ROOT;