Commit f51b4ce6 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: shrink size of struct seg_entry 



Restructure struct seg_entry to eliminate holes in it, after that,
in 32-bits machine, it reduces size from 32 bytes to 24 bytes; in
64-bits machine, it reduces size from 56 bytes to 40 bytes.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent bd933d4f

fs/f2fs/segment.h

+5 −4
Original line number Diff line number Diff line
@@ -158,16 +158,17 @@ struct victim_sel_policy { 
};



struct seg_entry {

	unsigned short valid_blocks;	/* # of valid blocks */

	unsigned int type:6;		/* segment type like CURSEG_XXX_TYPE */

	unsigned int valid_blocks:10;	/* # of valid blocks */

	unsigned int ckpt_valid_blocks:10;	/* # of valid blocks last cp */

	unsigned int padding:6;		/* padding */

	unsigned char *cur_valid_map;	/* validity bitmap of blocks */

	/*

	 * # of valid blocks and the validity bitmap stored in the the last

	 * checkpoint pack. This information is used by the SSR mode.

	 */

	unsigned short ckpt_valid_blocks;

	unsigned char *ckpt_valid_map;

	unsigned char *ckpt_valid_map;	/* validity bitmap of blocks last cp */

	unsigned char *discard_map;

	unsigned char type;		/* segment type like CURSEG_XXX_TYPE */

	unsigned long long mtime;	/* modification time of the segment */

};

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