From 22ad0b6ab46683975c6da032f1c2593066c7b3bd Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Thu, 9 Feb 2017 10:38:09 -0800 Subject: f2fs: add bitmaps for empty or full NAT blocks This patches adds bitmaps to represent empty or full NAT blocks containing free nid entries. If we can find valid crc|cp_ver in the last block of checkpoint pack, we'll use these bitmaps when building free nids. In order to avoid checkpointing burden, up-to-date bitmaps will be flushed only during umount time. So, normally we can get this gain, but when power-cut happens, we rely on fsck.f2fs which recovers this bitmap again. After this patch, we build free nids from nid #0 at mount time to make more full NAT blocks, but in runtime, we check empty NAT blocks to load free nids without loading any NAT pages from disk. Signed-off-by: Jaegeuk Kim --- fs/f2fs/debug.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/f2fs/debug.c') diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c index de8da9fc5c99..015ad2b73a92 100644 --- a/fs/f2fs/debug.c +++ b/fs/f2fs/debug.c @@ -193,6 +193,7 @@ static void update_mem_info(struct f2fs_sb_info *sbi) /* build nm */ si->base_mem += sizeof(struct f2fs_nm_info); si->base_mem += __bitmap_size(sbi, NAT_BITMAP); + si->base_mem += (NM_I(sbi)->nat_bits_blocks << F2FS_BLKSIZE_BITS); get_cache: si->cache_mem = 0; -- cgit v1.2.3