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libfs: Create the helper function generic_ci_validate_strict_name()

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Create a helper function for filesystems do the checks required for
casefold directories and strict encoding.

Suggested-by: Gabriel Krisman Bertazi <krisman@suse.de>
Reviewed-by: Gabriel Krisman Bertazi <gabriel@krisman.be>
Signed-off-by: André Almeida <andrealmeid@igalia.com>
Link: https://lore.kernel.org/r/20241021-tonyk-tmpfs-v8-1-f443d5814194@igalia.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
André Almeida 2024-10-21 13:37:17 -03:00 committed by Christian Brauner
parent 42f7652d3e
commit 0e152beb5a
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1 changed files with 45 additions and 0 deletions
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45
include/linux/fs.h
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@ -45,6 +45,7 @@
#include <linux/slab.h>
#include <linux/maple_tree.h>
#include <linux/rw_hint.h>
#include <linux/unicode.h>
#include <asm/byteorder.h>
#include <uapi/linux/fs.h>
@ -3456,6 +3457,50 @@ extern int generic_ci_match(const struct inode *parent,
const struct qstr *folded_name,
const u8 *de_name, u32 de_name_len);
#if IS_ENABLED(CONFIG_UNICODE)
/**
* generic_ci_validate_strict_name - Check if a given name is suitable
* for a directory
*
* This functions checks if the proposed filename is valid for the
* parent directory. That means that only valid UTF-8 filenames will be
* accepted for casefold directories from filesystems created with the
* strict encoding flag. That also means that any name will be
* accepted for directories that doesn't have casefold enabled, or
* aren't being strict with the encoding.
*
* @dir: inode of the directory where the new file will be created
* @name: name of the new file
*
* Return:
* * True if the filename is suitable for this directory. It can be
* true if a given name is not suitable for a strict encoding
* directory, but the directory being used isn't strict
* * False if the filename isn't suitable for this directory. This only
* happens when a directory is casefolded and the filesystem is strict
* about its encoding.
*/
static inline bool generic_ci_validate_strict_name(struct inode *dir, struct qstr *name)
{
if (!IS_CASEFOLDED(dir) || !sb_has_strict_encoding(dir->i_sb))
return true;
/*
* A casefold dir must have a encoding set, unless the filesystem
* is corrupted
*/
if (WARN_ON_ONCE(!dir->i_sb->s_encoding))
return true;
return !utf8_validate(dir->i_sb->s_encoding, name);
}
#else
static inline bool generic_ci_validate_strict_name(struct inode *dir, struct qstr *name)
{
return true;
}
#endif
static inline bool sb_has_encoding(const struct super_block *sb)
{
#if IS_ENABLED(CONFIG_UNICODE)