Add a new structure, extent_change_set, to record how many bytes are
changed in one set/clear_extent_bits() operation, with detailed changed
ranges info.
This provides the needed facilities for later qgroup reserve framework.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
v3:
Newly introduced, to reuse existing extent_io facilities.
---
fs/btrfs/extent_io.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index c668f36..3107a6e 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -2,6 +2,7 @@
#define __EXTENTIO__
#include <linux/rbtree.h>
+#include "ulist.h"
/* bits for the extent state */
#define EXTENT_DIRTY (1U << 0)
@@ -161,6 +162,17 @@ struct extent_buffer {
#endif
};
+/*
+ * Structure to record how many bytes and which ranges are set/cleared
+ */
+struct extent_changeset {
+ /* How many bytes are set/cleared in this operation */
+ u64 bytes_changed;
+
+ /* Changed ranges */
+ struct ulist *range_changed;
+};
+
static inline void extent_set_compress_type(unsigned long *bio_flags,
int compress_type)
{
--
2.6.1
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
