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Date: Mon, 23 Aug 2021 11:02:52 -0400
From: Gabriel Krisman Bertazi <krisman@...labora.com>
To: Christoph Hellwig <hch@....de>
Cc: Shreeya Patel <shreeya.patel@...labora.com>,
linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 05/11] unicode: pass a UNICODE_AGE() tripple to utf8_load
Christoph Hellwig <hch@....de> writes:
> Don't bother with pointless string parsing when the caller can just pass
> the version in the format that the core expects. Also remove the
> fallback to the latest version that none of the callers actually uses.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> fs/ext4/super.c | 10 ++++----
> fs/f2fs/super.c | 10 ++++----
> fs/unicode/utf8-core.c | 50 ++++----------------------------------
> fs/unicode/utf8-norm.c | 11 ++-------
> fs/unicode/utf8-selftest.c | 15 ++++++------
> fs/unicode/utf8n.h | 14 ++---------
> include/linux/unicode.h | 11 ++++++++-
> 7 files changed, 37 insertions(+), 84 deletions(-)
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index a68be582bba5..be418a30b52e 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -2016,9 +2016,9 @@ static const struct mount_opts {
> static const struct ext4_sb_encodings {
> __u16 magic;
> char *name;
> - char *version;
> + unsigned int version;
> } ext4_sb_encoding_map[] = {
> - {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
> + {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
> };
>
> static const struct ext4_sb_encodings *
> @@ -4308,15 +4308,15 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> encoding = utf8_load(encoding_info->version);
> if (IS_ERR(encoding)) {
> ext4_msg(sb, KERN_ERR,
> - "can't mount with superblock charset: %s-%s "
> + "can't mount with superblock charset: %s-0x%x "
> "not supported by the kernel. flags: 0x%x.",
> encoding_info->name, encoding_info->version,
> encoding_flags);
> goto failed_mount;
> }
> ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
> - "%s-%s with flags 0x%hx", encoding_info->name,
> - encoding_info->version?:"\b", encoding_flags);
> + "%s-0x%x with flags 0x%hx", encoding_info->name,
> + encoding_info->version, encoding_flags);
>
> sb->s_encoding = encoding;
> sb->s_encoding_flags = encoding_flags;
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index af63ae009582..d107480f88a3 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -255,9 +255,9 @@ void f2fs_printk(struct f2fs_sb_info *sbi, const char *fmt, ...)
> static const struct f2fs_sb_encodings {
> __u16 magic;
> char *name;
> - char *version;
> + unsigned int version;
> } f2fs_sb_encoding_map[] = {
> - {F2FS_ENC_UTF8_12_1, "utf8", "12.1.0"},
> + {F2FS_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
> };
>
> static const struct f2fs_sb_encodings *
> @@ -3734,15 +3734,15 @@ static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
> encoding = utf8_load(encoding_info->version);
> if (IS_ERR(encoding)) {
> f2fs_err(sbi,
> - "can't mount with superblock charset: %s-%s "
> + "can't mount with superblock charset: %s-0x%x "
> "not supported by the kernel. flags: 0x%x.",
> encoding_info->name, encoding_info->version,
> encoding_flags);
> return PTR_ERR(encoding);
> }
> f2fs_info(sbi, "Using encoding defined by superblock: "
> - "%s-%s with flags 0x%hx", encoding_info->name,
> - encoding_info->version?:"\b", encoding_flags);
> + "%s-0x%x with flags 0x%hx", encoding_info->name,
> + encoding_info->version, encoding_flags);
>
> sbi->sb->s_encoding = encoding;
> sbi->sb->s_encoding_flags = encoding_flags;
> diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c
> index 86f42a078d99..dca2865c3bee 100644
> --- a/fs/unicode/utf8-core.c
> +++ b/fs/unicode/utf8-core.c
> @@ -167,59 +167,19 @@ int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
> }
> return -EINVAL;
> }
> -
> EXPORT_SYMBOL(utf8_normalize);
>
> -static int utf8_parse_version(const char *version, unsigned int *maj,
> - unsigned int *min, unsigned int *rev)
> +struct unicode_map *utf8_load(unsigned int version)
> {
> - substring_t args[3];
> - char version_string[12];
> - static const struct match_token token[] = {
> - {1, "%d.%d.%d"},
> - {0, NULL}
> - };
> -
> - strncpy(version_string, version, sizeof(version_string));
> -
> - if (match_token(version_string, token, args) != 1)
> - return -EINVAL;
> -
> - if (match_int(&args[0], maj) || match_int(&args[1], min) ||
> - match_int(&args[2], rev))
> - return -EINVAL;
> + struct unicode_map *um;
>
> - return 0;
> -}
> -
> -struct unicode_map *utf8_load(const char *version)
> -{
> - struct unicode_map *um = NULL;
> - int unicode_version;
> -
> - if (version) {
> - unsigned int maj, min, rev;
> -
> - if (utf8_parse_version(version, &maj, &min, &rev) < 0)
> - return ERR_PTR(-EINVAL);
> -
> - if (!utf8version_is_supported(maj, min, rev))
> - return ERR_PTR(-EINVAL);
> -
> - unicode_version = UNICODE_AGE(maj, min, rev);
> - } else {
> - unicode_version = utf8version_latest();
> - printk(KERN_WARNING"UTF-8 version not specified. "
> - "Assuming latest supported version (%d.%d.%d).",
> - (unicode_version >> 16) & 0xff,
> - (unicode_version >> 8) & 0xff,
> - (unicode_version & 0xff));
I remember this fallback was specifically requested during a review or
in a discussion, but I honestly cannot remember the reason.
One advantage I can think is if we have a filesystem that requires a
newer unicode version than the current kernel has, and strict mode flag
is set, we can fallback to the latest version and still mount the fs
read/write.
That is not implemented though, so I'm fine with this removal.
Reviewed-by: Gabriel Krisman Bertazi <krisman@...labora.com>
--
Gabriel Krisman Bertazi
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