mkfs.f2fs: support -C [no]hashonly to control linear lookup fallback
It provides a way to disable linear lookup fallback during mkfs.
Behavior summary:
Android Distro
By default disabled enabled
Android case:
1.1) Disable linear lookup:
- mkfs.f2fs -f -g android -O casefold -C utf8:hashonly /dev/vdb
- dump.f2fs -d3 /dev/vdb |grep s_encoding_flags
s_encoding_flags [0x 2 : 2]
1.2) Enable linear lookup:
- mkfs.f2fs -f -g android -O casefold -C utf8:nohashonly /dev/vdb
- dump.f2fs -d3 /dev/vdb |grep s_encoding_flags
s_encoding_flags [0x 0 : 0]
1.3) By default:
- mkfs.f2fs -f -g android -O casefold -C utf8 /dev/vdb
Info: set default linear_lookup option: disable
- dump.f2fs -d3 /dev/vdb |grep s_encoding_flags
s_encoding_flags [0x 2 : 2]
Distro case:
2.1) Disable linear lookup:
- mkfs.f2fs -f -O casefold -C utf8:hashonly /dev/vdb
- dump.f2fs -d3 /dev/vdb |grep s_encoding_flags
s_encoding_flags [0x 2 : 2]
2.2) Enable linear lookup:
- mkfs.f2fs -f -O casefold -C utf8:nohashonly /dev/vdb
- dump.f2fs -d3 /dev/vdb |grep s_encoding_flags
s_encoding_flags [0x 0 : 0]
2.3) By default:
- mkfs.f2fs -f -O casefold -C utf8 /dev/vdb
- dump.f2fs -d3 /dev/vdb |grep s_encoding_flags
s_encoding_flags [0x 0 : 0]
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
5 files changed
