GFS2: Make two similar quota code fragments into a function

There should be no functional change bar the removal of a
test of the MS_READONLY flag which would never be reachable.
This merges the common code from qd_fish and qd_trylock into
a single function and calls it from both those places.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Abhijith Das <adas@redhat.com>

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 658abe2..75414e7 100644 (file)
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -383,6 +383,25 @@ static void bh_put(struct gfs2_quota_data *qd)
        mutex_unlock(&sdp->sd_quota_mutex);
 }
 
+static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
+                        u64 *sync_gen)
+{
+       if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
+           !test_bit(QDF_CHANGE, &qd->qd_flags) ||
+           (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
+               return 0;
+
+       list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
+
+       set_bit(QDF_LOCKED, &qd->qd_flags);
+       gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
+       atomic_inc(&qd->qd_count);
+       qd->qd_change_sync = qd->qd_change;
+       gfs2_assert_warn(sdp, qd->qd_slot_count);
+       qd->qd_slot_count++;
+       return 1;
+}
+
 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 {
        struct gfs2_quota_data *qd = NULL;
@@ -397,22 +416,9 @@ static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
        spin_lock(&qd_lru_lock);
 
        list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
-               if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
-                   !test_bit(QDF_CHANGE, &qd->qd_flags) ||
-                   qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
-                       continue;
-
-               list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
-
-               set_bit(QDF_LOCKED, &qd->qd_flags);
-               gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
-               atomic_inc(&qd->qd_count);
-               qd->qd_change_sync = qd->qd_change;
-               gfs2_assert_warn(sdp, qd->qd_slot_count);
-               qd->qd_slot_count++;
-               found = 1;
-
-               break;
+               found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
+               if (found)
+                       break;
        }
 
        if (!found)
@@ -439,28 +445,14 @@ static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 static int qd_trylock(struct gfs2_quota_data *qd)
 {
        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
-
-       if (sdp->sd_vfs->s_flags & MS_RDONLY)
-               return 0;
+       int found;
 
        spin_lock(&qd_lru_lock);
+       found = qd_check_sync(sdp, qd, NULL);
+       spin_unlock(&qd_lru_lock);
 
-       if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
-           !test_bit(QDF_CHANGE, &qd->qd_flags)) {
-               spin_unlock(&qd_lru_lock);
+       if (!found)
                return 0;
-       }
-
-       list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
-
-       set_bit(QDF_LOCKED, &qd->qd_flags);
-       gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
-       atomic_inc(&qd->qd_count);
-       qd->qd_change_sync = qd->qd_change;
-       gfs2_assert_warn(sdp, qd->qd_slot_count);
-       qd->qd_slot_count++;
-
-       spin_unlock(&qd_lru_lock);
 
        gfs2_assert_warn(sdp, qd->qd_change_sync);
        if (bh_get(qd)) {