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f2fs: introduce CP_TRIMMED_FLAG to avoid unneeded discard

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Introduce CP_TRIMMED_FLAG to indicate all invalid block were trimmed
before umount, so once we do mount with image which contain the flag,
we don't record invalid blocks as undiscard one, when fstrim is being
triggered, we can avoid issuing redundant discard commands.

Signed-off-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
This commit is contained in:
Chao Yu 2017-04-28 13:56:08 +08:00 • committed by Jaegeuk Kim
commit 1f43e2ad7b
6 changed files with 35 additions and 9 deletions
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3
fs/f2fs/checkpoint.c
View file

@ -1059,6 +1059,9 @@ static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks)
disable_nat_bits(sbi, false);
if (cpc->reason & CP_TRIMMED)
__set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
if (cpc->reason & CP_UMOUNT)
__set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
else

1
fs/f2fs/f2fs.h
View file

@ -130,6 +130,7 @@ enum {
#define CP_SYNC 0x00000004
#define CP_RECOVERY 0x00000008
#define CP_DISCARD 0x00000010
#define CP_TRIMMED 0x00000020
#define DEF_BATCHED_TRIM_SECTIONS 2048
#define BATCHED_TRIM_SEGMENTS(sbi) \

28
fs/f2fs/segment.c
View file

@ -3005,10 +3005,17 @@ static void build_sit_entries(struct f2fs_sb_info *sbi)
/* build discard map only one time */
if (f2fs_discard_en(sbi)) {
memcpy(se->discard_map, se->cur_valid_map,
SIT_VBLOCK_MAP_SIZE);
sbi->discard_blks += sbi->blocks_per_seg -
se->valid_blocks;
if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
memset(se->discard_map, 0xff,
SIT_VBLOCK_MAP_SIZE);
} else {
memcpy(se->discard_map,
se->cur_valid_map,
SIT_VBLOCK_MAP_SIZE);
sbi->discard_blks +=
sbi->blocks_per_seg -
se->valid_blocks;
}
}
if (sbi->segs_per_sec > 1)
@ -3032,10 +3039,15 @@ static void build_sit_entries(struct f2fs_sb_info *sbi)
seg_info_from_raw_sit(se, &sit);
if (f2fs_discard_en(sbi)) {
memcpy(se->discard_map, se->cur_valid_map,
SIT_VBLOCK_MAP_SIZE);
sbi->discard_blks += old_valid_blocks -
se->valid_blocks;
if (is_set_ckpt_flags(sbi, CP_TRIMMED_FLAG)) {
memset(se->discard_map, 0xff,
SIT_VBLOCK_MAP_SIZE);
} else {
memcpy(se->discard_map, se->cur_valid_map,
SIT_VBLOCK_MAP_SIZE);
sbi->discard_blks += old_valid_blocks -
se->valid_blocks;
}
}
if (sbi->segs_per_sec > 1)

7
fs/f2fs/super.c
View file

@ -797,6 +797,13 @@ static void f2fs_put_super(struct super_block *sb)
/* be sure to wait for any on-going discard commands */
f2fs_wait_discard_bios(sbi);
if (!sbi->discard_blks) {
struct cp_control cpc = {
.reason = CP_UMOUNT | CP_TRIMMED,
};
write_checkpoint(sbi, &cpc);
}
/* write_checkpoint can update stat informaion */
f2fs_destroy_stats(sbi);