• Benjamin Marzinski's avatar
    GFS2: Various gfs2_logd improvements · 5e687eac
    Benjamin Marzinski authored
    This patch contains various tweaks to how log flushes and active item writeback
    work. gfs2_logd is now managed by a waitqueue, and gfs2_log_reseve now waits
    for gfs2_logd to do the log flushing.  Multiple functions were rewritten to
    remove the need to call gfs2_log_lock(). Instead of using one test to see if
    gfs2_logd had work to do, there are now seperate tests to check if there
    are two many buffers in the incore log or if there are two many items on the
    active items list.
    
    This patch is a port of a patch Steve Whitehouse wrote about a year ago, with
    some minor changes.  Since gfs2_ail1_start always submits all the active items,
    it no longer needs to keep track of the first ai submitted, so this has been
    removed. In gfs2_log_reserve(), the order of the calls to
    prepare_to_wait_exclusive() and wake_up() when firing off the logd thread has
    been switched.  If it called wake_up first there was a small window for a race,
    where logd could run and return before gfs2_log_reserve was ready to get woken
    up. If gfs2_logd ran, but did not free up enough blocks, gfs2_log_reserve()
    would be left waiting for gfs2_logd to eventualy run because it timed out.
    Finally, gt_logd_secs, which controls how long to wait before gfs2_logd times
    out, and flushes the log, can now be set on mount with ar_commit.
    Signed-off-by: default avatarBenjamin Marzinski <bmarzins@redhat.com>
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    5e687eac
lops.c 18.9 KB