• Bob Peterson's avatar
    GFS2: Reset rd_last_alloc when it reaches the end of the rgrp · 13d2eb01
    Bob Peterson authored
    In function rg_mblk_search, it's searching for multiple blocks in
    a given state (e.g. "free"). If there's an active block reservation
    its goal is the next free block of that. If the resource group
    contains the dinode's goal block, that's used for the search. But
    if neither is the case, it uses the rgrp's last allocated block.
    That way, consecutive allocations appear after one another on media.
    The problem comes in when you hit the end of the rgrp; it would never
    start over and search from the beginning. This became a problem,
    since if you deleted all the files and data from the rgrp, it would
    never start over and find free blocks. So it had to keep searching
    further out on the media to allocate blocks. This patch resets the
    rd_last_alloc after it does an unsuccessful search at the end of
    the rgrp.
    Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>