[PATCH v2 14/19] btrfs: make btree inode io_tree has its special owner

Qu Wenruo
2020-09-15T05:36:17Z

Btree inode is pretty special compared to all other inode extent io
tree, although it has a btrfs inode, it doesn't have the track_uptodate
bit at all.

This means a lot of things like extent locking doesn't even need to be
applied to btree io tree.

Since it's so special, adds a new owner value for it to make debuging a
little easier.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/disk-io.c | 2 +-
fs/btrfs/extent-io-tree.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1ba16951ccaa..82a841bd0702 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2126,7 +2126,7 @@ static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)

RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
- IO_TREE_INODE_IO, inode);
+ IO_TREE_BTREE_IO, inode);
BTRFS_I(inode)->io_tree.track_uptodate = false;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree);

diff --git a/fs/btrfs/extent-io-tree.h b/fs/btrfs/extent-io-tree.h
index 219a09a2b734..21d128383bfd 100644
--- a/fs/btrfs/extent-io-tree.h
+++ b/fs/btrfs/extent-io-tree.h
@@ -40,6 +40,7 @@ struct io_failure_record;
enum {
IO_TREE_FS_PINNED_EXTENTS,
IO_TREE_FS_EXCLUDED_EXTENTS,
+ IO_TREE_BTREE_IO,
IO_TREE_INODE_IO,
IO_TREE_INODE_IO_FAILURE,
IO_TREE_RELOC_BLOCKS,
--
2.28.0