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 <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
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@ -2,6 +2,7 @@
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#define __EXTENTIO__
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#include <linux/rbtree.h>
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#include "ulist.h"
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/* bits for the extent state */
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#define EXTENT_DIRTY (1U << 0)
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@ -161,6 +162,17 @@ struct extent_buffer {
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#endif
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};
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/*
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* Structure to record how many bytes and which ranges are set/cleared
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*/
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struct extent_changeset {
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/* How many bytes are set/cleared in this operation */
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u64 bytes_changed;
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/* Changed ranges */
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struct ulist *range_changed;
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};
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static inline void extent_set_compress_type(unsigned long *bio_flags,
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int compress_type)
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{
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