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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-02-09 10:38:09 -0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-02-27 09:59:54 -0800 |
| commit | 22ad0b6ab46683975c6da032f1c2593066c7b3bd (patch) | |
| tree | e4868123c476d3a4ebcdec04b50263ae49acd80a /include/linux | |
| parent | 5e8256ac2e378089a1bf3fae87370811b1d31625 (diff) | |
| download | lwn-22ad0b6ab46683975c6da032f1c2593066c7b3bd.tar.gz lwn-22ad0b6ab46683975c6da032f1c2593066c7b3bd.zip | |
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 'include/linux')
| -rw-r--r-- | include/linux/f2fs_fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h index f0748524ca8c..1c92ace2e8f8 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -114,6 +114,7 @@ struct f2fs_super_block { /* * For checkpoint */ +#define CP_NAT_BITS_FLAG 0x00000080 #define CP_CRC_RECOVERY_FLAG 0x00000040 #define CP_FASTBOOT_FLAG 0x00000020 #define CP_FSCK_FLAG 0x00000010 |