Function zap_name_alloc

freebsd/contrib/openzfs/module/zfs/zap_micro.c:173–230

}

zap_name_t *
zap_name_alloc(zap_t *zap, const char *key, matchtype_t mt)
{
	zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP);

	zn->zn_zap = zap;
	zn->zn_key_intlen = sizeof (*key);
	zn->zn_key_orig = key;
	zn->zn_key_orig_numints = strlen(zn->zn_key_orig) + 1;
	zn->zn_matchtype = mt;
	zn->zn_normflags = zap->zap_normflags;

	/*
	 * If we're dealing with a case sensitive lookup on a mixed or
	 * insensitive fs, remove U8_TEXTPREP_TOUPPER or the lookup
	 * will fold case to all caps overriding the lookup request.
	 */
	if (mt & MT_MATCH_CASE)
		zn->zn_normflags &= ~U8_TEXTPREP_TOUPPER;

	if (zap->zap_normflags) {
		/*
		 * We *must* use zap_normflags because this normalization is
		 * what the hash is computed from.
		 */
		if (zap_normalize(zap, key, zn->zn_normbuf,
		    zap->zap_normflags) != 0) {
			zap_name_free(zn);
			return (NULL);
		}
		zn->zn_key_norm = zn->zn_normbuf;
		zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1;
	} else {
		if (mt != 0) {
			zap_name_free(zn);
			return (NULL);
		}
		zn->zn_key_norm = zn->zn_key_orig;
		zn->zn_key_norm_numints = zn->zn_key_orig_numints;
	}

	zn->zn_hash = zap_hash(zn);

	if (zap->zap_normflags != zn->zn_normflags) {
		/*
		 * We *must* use zn_normflags because this normalization is
		 * what the matching is based on.  (Not the hash!)
		 */
		if (zap_normalize(zap, key, zn->zn_normbuf,
		    zn->zn_normflags) != 0) {
			zap_name_free(zn);
			return (NULL);
		}
		zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1;
	}

	return (zn);
}