From ac46777213e00e26b9210060586f473368c54da2 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Mon, 12 Oct 2015 12:08:16 +0800 Subject: btrfs: extent_io: Introduce needed structure for recoding set/clear bits 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 Signed-off-by: Chris Mason --- fs/btrfs/extent_io.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'fs/btrfs/extent_io.h') diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index c668f36898d3..3107a6eb8e78 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -2,6 +2,7 @@ #define __EXTENTIO__ #include +#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) { -- cgit v1.2.3