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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-09-19 17:55:10 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-09-30 10:05:46 -0700 |
| commit | a468f0ef516fda9c7d91bb550d458e853d76955e (patch) | |
| tree | 87906aa2c4e349c0b04e8276de05cf956887e150 /include | |
| parent | 5d4c0af41fd4cc26cb75af4f3de7fb63c91209c1 (diff) | |
| download | linux-a468f0ef516fda9c7d91bb550d458e853d76955e.tar.bz2 | |
f2fs: use crc and cp version to determine roll-forward recovery
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>
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 4c02c6521fef..422630b8e588 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -100,6 +100,7 @@ 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 |