xfs: use local variables for name and value length in _attri_commit_pass2

We're about to start using tagged unions in the xattr log format, so
create a bunch of local variables in the recovery function so we only
have to decode the log item fields once.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/xfs_attr_item.c

@@ -738,9 +738,11 @@ xlog_recover_attri_commit_pass2(
 	struct xfs_attri_log_item       *attrip;
 	struct xfs_attri_log_format     *attri_formatp;
 	struct xfs_attri_log_nameval	*nv;
-	const void			*attr_value = NULL;
 	const void			*attr_name;
+	const void			*attr_value = NULL;
 	size_t				len;
+	unsigned int			name_len = 0;
+	unsigned int			value_len = 0;
 	unsigned int			op, i = 0;
 
 	/* Validate xfs_attri_log_format before the large memory allocation */
@@ -769,6 +771,8 @@ xlog_recover_attri_commit_pass2(
 					     attri_formatp, len);
 			return -EFSCORRUPTED;
 		}
+		name_len = attri_formatp->alfi_name_len;
+		value_len = attri_formatp->alfi_value_len;
 		break;
 	case XFS_ATTRI_OP_FLAGS_REMOVE:
 		/* Log item, attr name */
@@ -777,6 +781,7 @@ xlog_recover_attri_commit_pass2(
 					     attri_formatp, len);
 			return -EFSCORRUPTED;
 		}
+		name_len = attri_formatp->alfi_name_len;
 		break;
 	default:
 		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
@@ -786,15 +791,14 @@ xlog_recover_attri_commit_pass2(
 	i++;
 
 	/* Validate the attr name */
-	if (item->ri_buf[i].i_len !=
-			xlog_calc_iovec_len(attri_formatp->alfi_name_len)) {
+	if (item->ri_buf[i].i_len != xlog_calc_iovec_len(name_len)) {
 		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 				attri_formatp, len);
 		return -EFSCORRUPTED;
 	}
 
 	attr_name = item->ri_buf[i].i_addr;
-	if (!xfs_attr_namecheck(attr_name, attri_formatp->alfi_name_len)) {
+	if (!xfs_attr_namecheck(attr_name, name_len)) {
 		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 				attri_formatp, len);
 		return -EFSCORRUPTED;
@@ -802,8 +806,8 @@ xlog_recover_attri_commit_pass2(
 	i++;
 
 	/* Validate the attr value, if present */
-	if (attri_formatp->alfi_value_len != 0) {
-		if (item->ri_buf[i].i_len != xlog_calc_iovec_len(attri_formatp->alfi_value_len)) {
+	if (value_len != 0) {
+		if (item->ri_buf[i].i_len != xlog_calc_iovec_len(value_len)) {
 			XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 					item->ri_buf[0].i_addr,
 					item->ri_buf[0].i_len);
@@ -827,7 +831,7 @@ xlog_recover_attri_commit_pass2(
 	switch (op) {
 	case XFS_ATTRI_OP_FLAGS_REMOVE:
 		/* Regular remove operations operate only on names. */
-		if (attr_value != NULL || attri_formatp->alfi_value_len != 0) {
+		if (attr_value != NULL || value_len != 0) {
 			XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 					     attri_formatp, len);
 			return -EFSCORRUPTED;
@@ -840,7 +844,7 @@ xlog_recover_attri_commit_pass2(
 		 * and do not take a newname.  Values are optional for set and
 		 * replace.
 		 */
-		if (attr_name == NULL || attri_formatp->alfi_name_len == 0) {
+		if (attr_name == NULL || name_len == 0) {
 			XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 					     attri_formatp, len);
 			return -EFSCORRUPTED;
@@ -853,9 +857,8 @@ xlog_recover_attri_commit_pass2(
 	 * name/value buffer to the recovered incore log item and drop our
 	 * reference.
 	 */
-	nv = xfs_attri_log_nameval_alloc(attr_name,
-			attri_formatp->alfi_name_len, attr_value,
-			attri_formatp->alfi_value_len);
+	nv = xfs_attri_log_nameval_alloc(attr_name, name_len,
+			attr_value, value_len);
 
 	attrip = xfs_attri_init(mp, nv);
 	memcpy(&attrip->attri_format, attri_formatp, len);