sysv: drop vmtruncate

index 0a65939..9d4dc68 100644
@@ -41,9 +41,11 @@ static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
 
 	if ((attr->ia_valid & ATTR_SIZE) &&
 	    attr->ia_size != i_size_read(inode)) {
-		error = vmtruncate(inode, attr->ia_size);
+		error = inode_newsize_ok(inode, attr->ia_size);
 		if (error)
 			return error;
+		truncate_setsize(inode, attr->ia_size);
+		sysv_truncate(inode);
 	}
 
 	setattr_copy(inode, attr);

@@ -52,7 +54,6 @@ static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
 }
 
 const struct inode_operations sysv_file_inode_operations = {
-	.truncate	= sysv_truncate,
 	.setattr	= sysv_setattr,
 	.getattr	= sysv_getattr,
 };

index 90b54b4..0d9c9c8 100644
@@ -473,8 +473,11 @@ static int sysv_write_begin(struct file *file, struct address_space *mapping,
 	ret = block_write_begin(mapping, pos, len, flags, pagep, get_block);
 	if (unlikely(ret)) {
 		loff_t isize = mapping->host->i_size;
-		if (pos + len > isize)
-			vmtruncate(mapping->host, isize);
+		if ((pos + len > isize) &&
+			inode_newsize_ok(mapping->host, isize) == 0) {
+			truncate_setsize(mapping->host, isize);
+			sysv_truncate(mapping->host);
+		}
 	}
 
 	return ret;