[GFS2] Remove queue_empty() function

This function is not longer required since we do not do recursive
locking in the glock layer. As a result all its callers can be
replaceed with list_empty() calls.

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

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 5b772bb..1509481 100644 (file)
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -210,30 +210,6 @@ out:
        return rv;
 }
 
-/**
- * queue_empty - check to see if a glock's queue is empty
- * @gl: the glock
- * @head: the head of the queue to check
- *
- * This function protects the list in the event that a process already
- * has a holder on the list and is adding a second holder for itself.
- * The glmutex lock is what generally prevents processes from working
- * on the same glock at once, but the special case of adding a second
- * holder for yourself ("recursive" locking) doesn't involve locking
- * glmutex, making the spin lock necessary.
- *
- * Returns: 1 if the queue is empty
- */
-
-static inline int queue_empty(struct gfs2_glock *gl, struct list_head *head)
-{
-       int empty;
-       spin_lock(&gl->gl_spin);
-       empty = list_empty(head);
-       spin_unlock(&gl->gl_spin);
-       return empty;
-}
-
 /**
  * search_bucket() - Find struct gfs2_glock by lock number
  * @bucket: the bucket to search
@@ -814,7 +790,7 @@ static void xmote_bh(struct gfs2_glock *gl, unsigned int ret)
        int op_done = 1;
 
        gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
-       gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders));
+       gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
        gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC));
 
        state_change(gl, ret & LM_OUT_ST_MASK);
@@ -925,7 +901,7 @@ void gfs2_glock_xmote_th(struct gfs2_holder *gh)
                glops->go_xmote_th(gl);
 
        gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
-       gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders));
+       gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
        gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED);
        gfs2_assert_warn(sdp, state != gl->gl_state);
 
@@ -960,7 +936,7 @@ static void drop_bh(struct gfs2_glock *gl, unsigned int ret)
        struct gfs2_holder *gh = gl->gl_req_gh;
 
        gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
-       gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders));
+       gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
        gfs2_assert_warn(sdp, !ret);
 
        state_change(gl, LM_ST_UNLOCKED);
@@ -1007,7 +983,7 @@ static void gfs2_glock_drop_th(struct gfs2_glock *gl)
                glops->go_drop_th(gl);
 
        gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
-       gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders));
+       gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
        gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED);
 
        gfs2_glock_hold(gl);
@@ -1697,7 +1673,7 @@ void gfs2_reclaim_glock(struct gfs2_sbd *sdp)
        atomic_inc(&sdp->sd_reclaimed);
 
        if (gfs2_glmutex_trylock(gl)) {
-               if (queue_empty(gl, &gl->gl_holders) &&
+               if (list_empty(&gl->gl_holders) &&
                    gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl))
                        handle_callback(gl, LM_ST_UNLOCKED);
                gfs2_glmutex_unlock(gl);
@@ -1761,7 +1737,7 @@ static void scan_glock(struct gfs2_glock *gl)
                return;
 
        if (gfs2_glmutex_trylock(gl)) {
-               if (queue_empty(gl, &gl->gl_holders) &&
+               if (list_empty(&gl->gl_holders) &&
                    gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl))
                        goto out_schedule;
                gfs2_glmutex_unlock(gl);
@@ -1810,7 +1786,7 @@ static void clear_glock(struct gfs2_glock *gl)
        }
 
        if (gfs2_glmutex_trylock(gl)) {
-               if (queue_empty(gl, &gl->gl_holders) &&
+               if (list_empty(gl, &gl->gl_holders) &&
                    gl->gl_state != LM_ST_UNLOCKED)
                        handle_callback(gl, LM_ST_UNLOCKED);
                gfs2_glmutex_unlock(gl);