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authorJaegeuk Kim <jaegeuk@kernel.org>2017-02-09 10:38:09 -0800
committerJaegeuk Kim <jaegeuk@kernel.org>2017-02-27 09:59:54 -0800
commit22ad0b6ab46683975c6da032f1c2593066c7b3bd (patch)
treee4868123c476d3a4ebcdec04b50263ae49acd80a /fs/f2fs/debug.c
parent5e8256ac2e378089a1bf3fae87370811b1d31625 (diff)
downloadlinux-22ad0b6ab46683975c6da032f1c2593066c7b3bd.tar.bz2
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 <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/debug.c')
-rw-r--r--fs/f2fs/debug.c1
1 files changed, 1 insertions, 0 deletions
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;