Can we disable linear lookup by default, but add an option to enable it?
On 07/24, Chao Yu wrote:
> It provides a way to disable linear lookup fallback during mkfs.
>
> Usage:
>
> 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. 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]
>
> mkfs.f2fs -f -O casefold -C utf8 /dev/vdb
> dump.f2fs -d3 /dev/vdb |grep s_encoding_flags
> s_encoding_flags [0x 0 : 0]
>
> Signed-off-by: Chao Yu <c...@kernel.org>
> ---
> lib/libf2fs.c | 1 +
> man/mkfs.f2fs.8 | 8 +++++++-
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/lib/libf2fs.c b/lib/libf2fs.c
> index 2f012c8..0e3e62a 100644
> --- a/lib/libf2fs.c
> +++ b/lib/libf2fs.c
> @@ -1424,6 +1424,7 @@ static const struct enc_flags {
> char *param;
> } encoding_flags[] = {
> { F2FS_ENC_STRICT_MODE_FL, "strict" },
> + { F2FS_ENC_NO_COMPAT_FALLBACK_FL, "hashonly"}
> };
>
> /* Return a positive number < 0xff indicating the encoding magic number
> diff --git a/man/mkfs.f2fs.8 b/man/mkfs.f2fs.8
> index 8b3b0cc..b57f033 100644
> --- a/man/mkfs.f2fs.8
> +++ b/man/mkfs.f2fs.8
> @@ -232,10 +232,16 @@ Use UTF-8 for casefolding.
> .I flags:
> .RS 1.2i
> .TP 1.2i
> -.B strict
> +.B [no]strict
> This flag specifies that invalid strings should be rejected by the
> filesystem.
> Default is disabled.
> .RE
> +.RS 1.2i
> +.TP 1.2i
> +.B [no]hashonly
> +This flag specifies that there is no linear lookup fallback during lookup.
> +By default, linear lookup fallback is enabled.
> +.RE
> .RE
> .TP
> .BI \-q
> --
> 2.49.0
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