On Wed, May 18, 2022 at 01:23:16PM -0400, Gabriel Krisman Bertazi wrote:
> Instead of reimplementing ext4_match_ci, use the new libfs helper.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
> ---
[...]
> int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
> struct ext4_filename *name)
> {
> @@ -1432,20 +1380,25 @@ static bool ext4_match(struct inode *parent,
> #if IS_ENABLED(CONFIG_UNICODE)
> if (parent->i_sb->s_encoding && IS_CASEFOLDED(parent) &&
> (!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) {
> - if (fname->cf_name.name) {
> - if (IS_ENCRYPTED(parent)) {
> - if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
> - fname->hinfo.minor_hash !=
> - EXT4_DIRENT_MINOR_HASH(de)) {
> + int ret;
>
> - return false;
> - }
> - }
> - return !ext4_ci_compare(parent, &fname->cf_name,
> - de->name, de->name_len, true);
> + if (IS_ENCRYPTED(parent) &&
> + (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
> + fname->hinfo.minor_hash != EXT4_DIRENT_MINOR_HASH(de)))
> + return false;
> +
> + ret = generic_ci_match(parent, fname->usr_fname,
> + &fname->cf_name, de->name,
> + de->name_len);
> + if (ret < 0) {
> + /*
> + * Treat comparison errors as not a match. The
> + * only case where it happens is on a disk
> + * corruption or ENOMEM.
> + */
> + return false;
> }
> - return !ext4_ci_compare(parent, fname->usr_fname, de->name,
> - de->name_len, false);
> + return ret;
> }
This needs an explanation for why it's okay to remove
'fname->cf_name.name != NULL' from the condition for doing the hash comparison
for an encrypted+casefolded directory entry.
- Eric
