Btrfs: don't do unnecessary delalloc flushes when relocating

[cascardo/linux.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 84a6a5b..90e70e2 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1408,6 +1408,17 @@ struct btrfs_block_group_cache {
 
        struct btrfs_io_ctl io_ctl;
 
+       /*
+        * Incremented when doing extent allocations and holding a read lock
+        * on the space_info's groups_sem semaphore.
+        * Decremented when an ordered extent that represents an IO against this
+        * block group's range is created (after it's added to its inode's
+        * root's list of ordered extents) or immediately after the allocation
+        * if it's a metadata extent or fallocate extent (for these cases we
+        * don't create ordered extents).
+        */
+       atomic_t reservations;
+
        /* Lock for free space tree operations. */
        struct mutex free_space_lock;
 
@@ -3499,6 +3510,9 @@ int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
                                       struct btrfs_root *root);
 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
                                       struct btrfs_root *root);
+void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
+                                        const u64 start);
+void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
                           struct btrfs_root *root, unsigned long count);