diff options
| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-09-19 17:55:10 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-26 09:42:46 +0100 |
| commit | 65b9d5326d7d6dcd9239481e98ed2d4938420f31 (patch) | |
| tree | cd65e76b761d8a031892dc321d956af47d44926d /include | |
| parent | 5dfb9eb6ca6ad3de8af37210b1eadf5faf7cdc32 (diff) | |
f2fs: use crc and cp version to determine roll-forward recovery
commit a468f0ef516fda9c7d91bb550d458e853d76955e upstream.
Previously, we used cp_version only to detect recoverable dnodes.
In order to avoid same garbage cp_version, we needed to truncate the next
dnode during checkpoint, resulting in additional discard or data write.
If we can distinguish this by using crc in addition to cp_version, we can
remove this overhead.
There is backward compatibility concern where it changes node_footer layout.
So, this patch introduces a new checkpoint flag, CP_CRC_RECOVERY_FLAG, to
detect new layout. New layout will be activated only when this flag is set.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[bwh: Backported to 4.4:
- Deleted code is slightly different
- Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -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 1f81ebcc2948..520fd854e7b3 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -99,6 +99,7 @@ struct f2fs_super_block { /* * For checkpoint */ +#define CP_CRC_RECOVERY_FLAG 0x00000040 #define CP_FASTBOOT_FLAG 0x00000020 #define CP_FSCK_FLAG 0x00000010 #define CP_ERROR_FLAG 0x00000008 |