From: Chao Yu Date: Wed, 4 May 2016 15:19:48 +0000 (+0800) Subject: f2fs: shrink size of struct seg_entry X-Git-Tag: v4.7-rc1~84^2~31 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f51b4ce6c1759a64d68d314545854dc226ab69a0;p=karo-tx-linux.git 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: Chao Yu Signed-off-by: Jaegeuk Kim --- diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index 975c33df65c7..7a756ff5a36d 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -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 */ };