btrfs: add new flushing states for the delayed refs rsv

A nice thing we gain with the delayed refs rsv is the ability to flush
the delayed refs on demand to deal with enospc pressure.  Add states to
flush delayed refs on demand, and this will allow us to remove a lot of
ad-hoc work around checking to see if we should commit the transaction
to run our delayed refs.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ab9d9ed20e0c..d07a23f15e22 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2765,10 +2765,12 @@ enum btrfs_reserve_flush_enum {
 enum btrfs_flush_state {
         FLUSH_DELAYED_ITEMS_NR  =       1,
         FLUSH_DELAYED_ITEMS     =       2,
-        FLUSH_DELALLOC          =       3,
-        FLUSH_DELALLOC_WAIT     =       4,
-        ALLOC_CHUNK             =       5,
-        COMMIT_TRANS            =       6,
+        FLUSH_DELAYED_REFS_NR   =       3,
+        FLUSH_DELAYED_REFS      =       4,
+        FLUSH_DELALLOC          =       5,
+        FLUSH_DELALLOC_WAIT     =       6,
+        ALLOC_CHUNK             =       7,
+        COMMIT_TRANS            =       8,
 };
 
 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);