Btrfs: Update metadata reservation for delayed allocation

Introduce metadata reservation context for delayed allocation
and update various related functions.

This patch also introduces EXTENT_FIRST_DELALLOC control bit for
set/clear_extent_bit. It tells set/clear_bit_hook whether they
are processing the first extent_state with EXTENT_DELALLOC bit
set. This change is important if set/clear_extent_bit involves
multiple extent_state.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index a127c0ebb2dc..c9f1020572f2 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -311,13 +311,6 @@ static int __btrfs_remove_ordered_extent(struct inode *inode,
         tree->last = NULL;
         set_bit(BTRFS_ORDERED_COMPLETE, &entry->flags);
 
-        spin_lock(&BTRFS_I(inode)->accounting_lock);
-        WARN_ON(!BTRFS_I(inode)->outstanding_extents);
-        BTRFS_I(inode)->outstanding_extents--;
-        spin_unlock(&BTRFS_I(inode)->accounting_lock);
-        btrfs_unreserve_metadata_for_delalloc(BTRFS_I(inode)->root,
-                                              inode, 1);
-
         spin_lock(&root->fs_info->ordered_extent_lock);
         list_del_init(&entry->root_extent_list);