forked from mirrors/linux
142fa60f61
All filesystems that currently support UTF-8 casefold can fetch the UTF-8 version from the filesystem metadata stored on disk. They can get the data stored and directly match it to a integer, so they can skip the string parsing step, which motivated the removal of this function in the first place. However, for tmpfs, the only way to tell the kernel which UTF-8 version we are about to use is via mount options, using a string. Re-introduce utf8_parse_version() to be used by tmpfs. This version differs from the original by skipping the intermediate step of copying the version string to an auxiliary string before calling match_token(). This versions calls match_token() in the argument string. The paramenters are simpler now as well. utf8_parse_version() was created by9d53690f0d("unicode: implement higher level API for string handling") and later removed by49bd03cc7e("unicode: pass a UNICODE_AGE() tripple to utf8_load"). Signed-off-by: André Almeida <andrealmeid@igalia.com> Link: https://lore.kernel.org/r/20241021-tonyk-tmpfs-v8-4-f443d5814194@igalia.com Reviewed-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_UNICODE_H
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#define _LINUX_UNICODE_H
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#include <linux/init.h>
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#include <linux/dcache.h>
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struct utf8data;
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struct utf8data_table;
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#define UNICODE_MAJ_SHIFT 16
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#define UNICODE_MIN_SHIFT 8
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#define UNICODE_AGE(MAJ, MIN, REV) \
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(((unsigned int)(MAJ) << UNICODE_MAJ_SHIFT) | \
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((unsigned int)(MIN) << UNICODE_MIN_SHIFT) | \
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((unsigned int)(REV)))
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#define UTF8_LATEST UNICODE_AGE(12, 1, 0)
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static inline u8 unicode_major(unsigned int age)
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{
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return (age >> UNICODE_MAJ_SHIFT) & 0xff;
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}
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static inline u8 unicode_minor(unsigned int age)
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{
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return (age >> UNICODE_MIN_SHIFT) & 0xff;
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}
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static inline u8 unicode_rev(unsigned int age)
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{
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return age & 0xff;
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}
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/*
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* Two normalization forms are supported:
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* 1) NFDI
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* - Apply unicode normalization form NFD.
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* - Remove any Default_Ignorable_Code_Point.
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* 2) NFDICF
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* - Apply unicode normalization form NFD.
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* - Remove any Default_Ignorable_Code_Point.
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* - Apply a full casefold (C + F).
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*/
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enum utf8_normalization {
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UTF8_NFDI = 0,
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UTF8_NFDICF,
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UTF8_NMAX,
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};
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struct unicode_map {
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unsigned int version;
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const struct utf8data *ntab[UTF8_NMAX];
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const struct utf8data_table *tables;
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};
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int utf8_validate(const struct unicode_map *um, const struct qstr *str);
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int utf8_strncmp(const struct unicode_map *um,
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const struct qstr *s1, const struct qstr *s2);
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int utf8_strncasecmp(const struct unicode_map *um,
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const struct qstr *s1, const struct qstr *s2);
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int utf8_strncasecmp_folded(const struct unicode_map *um,
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const struct qstr *cf,
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const struct qstr *s1);
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int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
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unsigned char *dest, size_t dlen);
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int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
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unsigned char *dest, size_t dlen);
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int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
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struct qstr *str);
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struct unicode_map *utf8_load(unsigned int version);
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void utf8_unload(struct unicode_map *um);
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int utf8_parse_version(char *version);
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#endif /* _LINUX_UNICODE_H */
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