linux-kernel - [PATCH v4 2/9] fs: Create new helper sb

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Message-Id: <20250813-tonyk-overlayfs-v4-2-357ccf2e12ad@igalia.com>
Date: Wed, 13 Aug 2025 19:36:38 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Miklos Szeredi <miklos@...redi.hu>, Amir Goldstein <amir73il@...il.com>, 
 Theodore Tso <tytso@....edu>, Gabriel Krisman Bertazi <krisman@...nel.org>
Cc: linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-fsdevel@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 kernel-dev@...lia.com, 
 André Almeida <andrealmeid@...lia.com>
Subject: [PATCH v4 2/9] fs: Create new helper sb_encoding()

Filesystems that need to deal with the super block encoding need to use
a if IS_ENABLED(CONFIG_UNICODE) around it because this struct member is
not declared otherwise. In order to move this if/endif guards outside of
the filesytem code and make it simpler, create a new function that
returns the s_encoding member of struct super_block if Unicode is
enabled, and return NULL otherwise.

Suggested-by: Amir Goldstein <amir73il@...il.com>
Signed-off-by: André Almeida <andrealmeid@...lia.com>
---
Changes from v3:
- New patch
---
 include/linux/fs.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 796319914b0a063642c2bd0c0140697a0eb651f6..20102d81e18a59d5daaed06855d1f168979b4fa7 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3739,15 +3739,20 @@ static inline bool generic_ci_validate_strict_name(struct inode *dir, struct qst
 }
 #endif
 
-static inline bool sb_has_encoding(const struct super_block *sb)
+static inline struct unicode_map *sb_encoding(const struct super_block *sb)
 {
 #if IS_ENABLED(CONFIG_UNICODE)
-	return !!sb->s_encoding;
+	return sb->s_encoding;
 #else
-	return false;
+	return NULL;
 #endif
 }
 
+static inline bool sb_has_encoding(const struct super_block *sb)
+{
+	return !!sb_encoding(sb);
+}
+
 int may_setattr(struct mnt_idmap *idmap, struct inode *inode,
 		unsigned int ia_valid);
 int setattr_prepare(struct mnt_idmap *, struct dentry *, struct iattr *);

-- 
2.50.1