file1: Bsize 1024 Reserve 36 Extent Size 3 align noextend
The above line indicates a file with 36 blocks of reservation, a fixed extent size of 3 blocks, all extents aligned to 3 block boundaries, and the file unable to be grown once the current reservation is exhausted. In this case, the file system block size is 1024 bytes. Reservation and fixed extent sizes are allocated in units of the file system block size.
The align and noextend allocation flags (set through setext or the VX_SETEXT ioctl) are persistent attributes of the file and therefore visible via getext or the VX_GETEXT ioctl. trim is also visible, although it is cleared and the reservation is reduced on the final close of the file.