[GFS2] Fix assert in log code

Although the values were all being calculated correctly, there was a
race in the assert due to the way it was using atomic variables. This
changes the value we assert on so that we get the same effect by testing
a different variable. This prevents the assert triggering when it shouldn't.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 91645259e135..161ab6f2058e 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -757,7 +757,7 @@ void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
 static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 {
         unsigned int reserved;
-        unsigned int old;
+        unsigned int unused;
 
         gfs2_log_lock(sdp);
 
@@ -769,14 +769,11 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
         sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
         gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
         reserved = calc_reserved(sdp);
-        old = atomic_read(&sdp->sd_log_blks_free);
-        atomic_add(tr->tr_reserved - (reserved - sdp->sd_log_blks_reserved),
-                   &sdp->sd_log_blks_free);
-
-        gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) >= old);
+        unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
+        gfs2_assert_withdraw(sdp, unused >= 0);
+        atomic_add(unused, &sdp->sd_log_blks_free);
         gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
                              sdp->sd_jdesc->jd_blocks);
-
         sdp->sd_log_blks_reserved = reserved;
 
         gfs2_log_unlock(sdp);