kernel/linux.git/include/linux/unicode.h, branch v6.19.11

unicode: Recreate utf8_parse_version()

2024-10-28T12:36:54+00:00

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 by 9d53690f0d4 ("unicode: implement higher level API for string handling") and later removed by 49bd03cc7e9 ("unicode: pass a UNICODE_AGE() tripple to utf8_load"). Signed-off-by: André Almeida Link: https://lore.kernel.org/r/20241021-tonyk-tmpfs-v8-4-f443d5814194@igalia.com Reviewed-by: Theodore Ts'o Reviewed-by: Gabriel Krisman Bertazi Signed-off-by: Christian Brauner

unicode: Export latest available UTF-8 version number

2024-10-28T12:36:54+00:00

Export latest available UTF-8 version number so filesystems can easily load the newest one. Signed-off-by: André Almeida Link: https://lore.kernel.org/r/20241021-tonyk-tmpfs-v8-3-f443d5814194@igalia.com Acked-by: Gabriel Krisman Bertazi Signed-off-by: Christian Brauner

unicode: Add utf8-data module

2021-10-12T14:41:39+00:00

utf8data.h contains a large database table which is an auto-generated decodification trie for the unicode normalization functions. Allow building it into a separate module. Based on a patch from Shreeya Patel . Signed-off-by: Christoph Hellwig Signed-off-by: Gabriel Krisman Bertazi

unicode: cache the normalization tables in struct unicode_map

2021-10-11T20:02:02+00:00

Instead of repeatedly looking up the version add pointers to the NFD and NFD+CF tables to struct unicode_map, and pass a unicode_map plus index to the functions using the normalization tables. Signed-off-by: Christoph Hellwig Signed-off-by: Gabriel Krisman Bertazi

unicode: pass a UNICODE_AGE() tripple to utf8_load

2021-10-11T20:01:46+00:00

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 Signed-off-by: Gabriel Krisman Bertazi

unicode: mark the version field in struct unicode_map unsigned

2021-10-11T20:01:40+00:00

unicode version tripplets are always unsigned. Signed-off-by: Christoph Hellwig Reviewed-by: Gabriel Krisman Bertazi Signed-off-by: Gabriel Krisman Bertazi

unicode: remove the charset field from struct unicode_map

2021-10-11T20:01:35+00:00

It is hardcoded and only used for a f2fs sysfs file where it can be hardcoded just as easily. Signed-off-by: Christoph Hellwig Reviewed-by: Gabriel Krisman Bertazi Signed-off-by: Gabriel Krisman Bertazi

unicode: Add utf8_casefold_hash

2020-09-10T21:03:31+00:00

This adds a case insensitive hash function to allow taking the hash without needing to allocate a casefolded copy of the string. The existing d_hash implementations for casefolding allocate memory within rcu-walk, by avoiding it we can be more efficient and avoid worrying about a failed allocation. Signed-off-by: Daniel Rosenberg Reviewed-by: Gabriel Krisman Bertazi Reviewed-by: Eric Biggers Signed-off-by: Jaegeuk Kim

ext4: optimize case-insensitive lookups

2019-06-20T03:45:09+00:00

Temporarily cache a casefolded version of the file name under lookup in ext4_filename, to avoid repeatedly casefolding it. I got up to 30% speedup on lookups of large directories (>100k entries), depending on the length of the string under lookup. Signed-off-by: Gabriel Krisman Bertazi Signed-off-by: Theodore Ts'o

unicode: implement higher level API for string handling

2019-04-25T17:51:22+00:00

This patch integrates the utf8n patches with some higher level API to perform UTF-8 string comparison, normalization and casefolding operations. Implemented is a variation of NFD, and casefold is performed by doing full casefold on top of NFD. These algorithms are based on the core implemented by Olaf Weber from SGI. Signed-off-by: Gabriel Krisman Bertazi Signed-off-by: Theodore Ts'o