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btrfs: extent_io: Introduce needed structure for recoding set/clear bits

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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@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-10-12 12:08:16 +08:00 committed by Chris Mason
parent a408365c62
commit ac46777213
1 changed files with 12 additions and 0 deletions
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12
fs/btrfs/extent_io.h
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@ -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)
{