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f2fs: support async discard

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Like most filesystems, f2fs will issue discard command synchronously, so
when user trigger fstrim through ioctl, multiple discard commands will be
issued serially with sync mode, which makes poor performance.

In this patch we try to support async discard, so that all discard
commands can be issued and be waited for endio in batch to improve
performance.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2016-08-29 23:58:34 +08:00
committed by Jaegeuk Kim
parent 167451efb5
commit 275b66b09e
4 changed files with 99 additions and 2 deletions
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3
fs/f2fs/checkpoint.c
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@@ -1197,6 +1197,7 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
f2fs_bug_on(sbi, prefree_segments(sbi));
flush_sit_entries(sbi, cpc);
clear_prefree_segments(sbi, cpc);
f2fs_wait_all_discard_bio(sbi);
unblock_operations(sbi);
goto out;
}
@@ -1216,6 +1217,8 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
/* unlock all the fs_lock[] in do_checkpoint() */
err = do_checkpoint(sbi, cpc);
f2fs_wait_all_discard_bio(sbi);
unblock_operations(sbi);
stat_inc_cp_count(sbi->stat_info);