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Message-Id: <20220511193146.27526-8-krisman@collabora.com>
Date: Wed, 11 May 2022 15:31:43 -0400
From: Gabriel Krisman Bertazi <krisman@...labora.com>
To: tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org
Cc: linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
ebiggers@...nel.org,
Gabriel Krisman Bertazi <krisman@...labora.com>,
kernel@...labora.com
Subject: [PATCH v4 07/10] ext4: Move ext4_match_ci into libfs
Matching case-insensitive names is a generic operation and can be shared
with f2fs. Move it next to the rest of the shared casefold fs code.
Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
fs/ext4/namei.c | 62 +---------------------------------------------
fs/libfs.c | 61 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/fs.h | 3 +++
3 files changed, 65 insertions(+), 61 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 708811525411..16fd0df5f8a8 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1318,66 +1318,6 @@ static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
}
#if IS_ENABLED(CONFIG_UNICODE)
-/**
- * ext4_match_ci() - Match (case-insensitive) a name with a dirent.
- * @parent: Inode of the parent of the dentry.
- * @uname: name under lookup.
- * @de_name: Dirent name.
- * @de_name_len: dirent name length.
- *
- * Test whether a case-insensitive directory entry matches the filename
- * being searched.
- *
- * Return: > 0 if the directory entry matches, 0 if it doesn't match, or
- * < 0 on error.
- */
-static int ext4_match_ci(const struct inode *parent,
- const struct unicode_name *uname,
- u8 *de_name, size_t de_name_len)
-{
- const struct super_block *sb = parent->i_sb;
- const struct unicode_map *um = sb->s_encoding;
- struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len);
- struct qstr entry = QSTR_INIT(de_name, de_name_len);
- int ret, match = false;
-
- if (IS_ENCRYPTED(parent)) {
- const struct fscrypt_str encrypted_name =
- FSTR_INIT(de_name, de_name_len);
-
- decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL);
- if (!decrypted_name.name)
- return -ENOMEM;
- ret = fscrypt_fname_disk_to_usr(parent, 0, 0, &encrypted_name,
- &decrypted_name);
- if (ret < 0)
- goto out;
- entry.name = decrypted_name.name;
- entry.len = decrypted_name.len;
- }
-
- if (uname->folded_name->name)
- ret = utf8_strncasecmp_folded(um, uname->folded_name, &entry);
- else
- ret = utf8_strncasecmp(um, uname->usr_name, &entry);
-
- if (!ret)
- match = true;
- else if (ret < 0 && !sb_has_strict_encoding(sb)) {
- /*
- * In non-strict mode, fallback to a byte comparison if
- * the names have invalid characters.
- */
- ret = 0;
- match = ((uname->usr_name->len == entry.len) &&
- !memcmp(uname->usr_name->name, entry.name, entry.len));
- }
-
-out:
- kfree(decrypted_name.name);
- return (ret >= 0) ? match : ret;
-}
-
int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
struct ext4_filename *name)
{
@@ -1451,7 +1391,7 @@ static bool ext4_match(struct inode *parent,
};
int ret;
- ret = ext4_match_ci(parent, &u, de->name, de->name_len);
+ ret = generic_ci_match(parent, &u, de->name, de->name_len);
if (ret < 0) {
/*
* Treat comparison errors as not a match. The
diff --git a/fs/libfs.c b/fs/libfs.c
index 974125270a42..c14b3fa615f5 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1465,6 +1465,67 @@ static const struct dentry_operations generic_ci_dentry_ops = {
.d_hash = generic_ci_d_hash,
.d_compare = generic_ci_d_compare,
};
+
+/**
+ * generic_ci_match() - Match (case-insensitive) a name with a dirent.
+ * @parent: Inode of the parent of the dentry.
+ * @uname: name under lookup.
+ * @de_name: Dirent name.
+ * @de_name_len: dirent name length.
+ *
+ * Test whether a case-insensitive directory entry matches the filename
+ * being searched.
+ *
+ * Return: > 0 if the directory entry matches, 0 if it doesn't match, or
+ * < 0 on error.
+ */
+int generic_ci_match(const struct inode *parent,
+ const struct unicode_name *uname,
+ u8 *de_name, size_t de_name_len)
+{
+ const struct super_block *sb = parent->i_sb;
+ const struct unicode_map *um = sb->s_encoding;
+ struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len);
+ struct qstr entry = QSTR_INIT(de_name, de_name_len);
+ int ret, match = false;
+
+ if (IS_ENCRYPTED(parent)) {
+ const struct fscrypt_str encrypted_name =
+ FSTR_INIT(de_name, de_name_len);
+
+ decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL);
+ if (!decrypted_name.name)
+ return -ENOMEM;
+ ret = fscrypt_fname_disk_to_usr(parent, 0, 0, &encrypted_name,
+ &decrypted_name);
+ if (ret < 0)
+ goto out;
+ entry.name = decrypted_name.name;
+ entry.len = decrypted_name.len;
+ }
+
+ if (uname->folded_name->name)
+ ret = utf8_strncasecmp_folded(um, uname->folded_name, &entry);
+ else
+ ret = utf8_strncasecmp(um, uname->usr_name, &entry);
+
+ if (!ret)
+ match = true;
+ else if (ret < 0 && !sb_has_strict_encoding(sb)) {
+ /*
+ * In non-strict mode, fallback to a byte comparison if
+ * the names have invalid characters.
+ */
+ ret = 0;
+ match = ((uname->usr_name->len == entry.len) &&
+ !memcmp(uname->usr_name->name, entry.name, entry.len));
+ }
+
+out:
+ kfree(decrypted_name.name);
+ return (ret >= 0) ? match : ret;
+}
+EXPORT_SYMBOL(generic_ci_match);
#endif
#ifdef CONFIG_FS_ENCRYPTION
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3f76a18a5f40..6a750b8704c9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3364,6 +3364,9 @@ struct unicode_name {
};
extern void generic_set_encrypted_ci_d_ops(struct dentry *dentry);
+extern int generic_ci_match(const struct inode *parent,
+ const struct unicode_name *uname, u8 *de_name,
+ size_t de_name_len);
#ifdef CONFIG_MIGRATION
extern int buffer_migrate_page(struct address_space *,
--
2.36.1
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