• Abhi Das's avatar
    gfs2: handle NULL rgd in set_rgrp_preferences · 959b6717
    Abhi Das authored
    The function set_rgrp_preferences() does not handle the (rarely
    returned) NULL value from gfs2_rgrpd_get_next() and this patch
    fixes that.
    The fs image in question is only 150MB in size which allows for
    only 1 rgrp to be created. The in-memory rb tree has only 1 node
    and when gfs2_rgrpd_get_next() is called on this sole rgrp, it
    returns NULL. (Default behavior is to wrap around the rb tree and
    return the first node to give the illusion of a circular linked
    list. In the case of only 1 rgrp, we can't have
    gfs2_rgrpd_get_next() return the same rgrp (first, last, next all
    point to the same rgrp)... that would cause unintended consequences
    and infinite loops.)
    Signed-off-by: default avatarAbhi Das <adas@redhat.com>
    Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>