Btrfs: Split the extent_map code into two parts
There is now extent_map for mapping offsets in the file to disk and
extent_io for state tracking, IO submission and extent_bufers.
The new extent_map code shifts from [start,end] pairs to [start,len], and
pushes the locking out into the caller. This allows a few performance
optimizations and is easier to use.
A number of extent_map usage bugs were fixed, mostly with failing
to remove extent_map entries when changing the file.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 163c01a..b4a1bc6 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -70,7 +70,7 @@
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree);
- extent_map_tree_init(&cur_trans->dirty_pages,
+ extent_io_tree_init(&cur_trans->dirty_pages,
root->fs_info->btree_inode->i_mapping,
GFP_NOFS);
} else {
@@ -153,7 +153,7 @@
int ret;
int err;
int werr = 0;
- struct extent_map_tree *dirty_pages;
+ struct extent_io_tree *dirty_pages;
struct page *page;
struct inode *btree_inode = root->fs_info->btree_inode;
u64 start;
@@ -610,7 +610,7 @@
struct btrfs_transaction *cur_trans;
struct btrfs_transaction *prev_trans = NULL;
struct list_head dirty_fs_roots;
- struct extent_map_tree *pinned_copy;
+ struct extent_io_tree *pinned_copy;
DEFINE_WAIT(wait);
int ret;
@@ -639,7 +639,7 @@
if (!pinned_copy)
return -ENOMEM;
- extent_map_tree_init(pinned_copy,
+ extent_io_tree_init(pinned_copy,
root->fs_info->btree_inode->i_mapping, GFP_NOFS);
trans->transaction->in_commit = 1;
