Btrfs: two stage dirty block group writeout
Block group cache writeout is currently waiting on the pages for each
block group cache before moving on to writing the next one. This commit
switches things around to send down all the caches and then wait on them
in batches.
The end result is much faster, since we're keeping the disk pipeline
full.
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e305ccd..1df0d9d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1261,9 +1261,12 @@
struct page *page;
struct page **pages;
struct btrfs_root *root;
+ struct inode *inode;
unsigned long size;
int index;
int num_pages;
+ int entries;
+ int bitmaps;
unsigned check_crcs:1;
};
@@ -1332,6 +1335,9 @@
/* For dirty block groups */
struct list_head dirty_list;
+ struct list_head io_list;
+
+ struct btrfs_io_ctl io_ctl;
};
/* delayed seq elem */