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f2fs: shrink size of struct seg_entry

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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 <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
This commit is contained in:
Chao Yu 2016-05-04 23:19:48 +08:00 • committed by Jaegeuk Kim
commit f51b4ce6c1
1 changed files with 5 additions and 4 deletions
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9
fs/f2fs/segment.h
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@ -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 */
};