[GFS2] Tidy up locking code

As per Jan Engelhardt's second email, this removes some unused code,
and fixes up indenting in various places.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

7 files changed, 47 insertions, 113 deletions

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 989f4f78f9be..fac271f390bf 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -300,8 +300,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, uint64_t number,
 
         /* If this glock protects actual on-disk data or metadata blocks,
            create a VFS inode to manage the pages/buffers holding them. */
-        if (glops == &gfs2_inode_glops ||
-            glops == &gfs2_rgrp_glops) {
+        if (glops == &gfs2_inode_glops || glops == &gfs2_rgrp_glops) {
                 gl->gl_aspace = gfs2_aspace_get(sdp);
                 if (!gl->gl_aspace) {
                         error = -ENOMEM;
@@ -820,13 +819,11 @@ static void xmote_bh(struct gfs2_glock *gl, unsigned int ret)
 
         if (!gh)
                 gl->gl_stamp = jiffies;
-
         else if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
                 spin_lock(&gl->gl_spin);
                 list_del_init(&gh->gh_list);
                 gh->gh_error = -EIO;
                 spin_unlock(&gl->gl_spin);
-
         } else if (test_bit(HIF_DEMOTE, &gh->gh_iflags)) {
                 spin_lock(&gl->gl_spin);
                 list_del_init(&gh->gh_list);
@@ -842,7 +839,7 @@ static void xmote_bh(struct gfs2_glock *gl, unsigned int ret)
                 spin_unlock(&gl->gl_spin);
 
                 if (ret & LM_OUT_CANCELED)
-                        handle_callback(gl, LM_ST_UNLOCKED); /* Lame */
+                        handle_callback(gl, LM_ST_UNLOCKED);
 
         } else if (ret & LM_OUT_CANCELED) {
                 spin_lock(&gl->gl_spin);
@@ -916,11 +913,8 @@ void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags)
         gfs2_assert_warn(sdp, state != LM_ST_UNLOCKED);
         gfs2_assert_warn(sdp, state != gl->gl_state);
 
-        if (gl->gl_state == LM_ST_EXCLUSIVE) {
-                if (glops->go_sync)
-                        glops->go_sync(gl,
-                                       DIO_METADATA | DIO_DATA | DIO_RELEASE);
-        }
+        if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync)
+                glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE);
 
         gfs2_glock_hold(gl);
         gl->gl_req_bh = xmote_bh;
@@ -1006,10 +1000,8 @@ void gfs2_glock_drop_th(struct gfs2_glock *gl)
         gfs2_assert_warn(sdp, queue_empty(gl, &gl->gl_holders));
         gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED);
 
-        if (gl->gl_state == LM_ST_EXCLUSIVE) {
-                if (glops->go_sync)
-                        glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE);
-        }
+        if (gl->gl_state == LM_ST_EXCLUSIVE && glops->go_sync)
+                glops->go_sync(gl, DIO_METADATA | DIO_DATA | DIO_RELEASE);
 
         gfs2_glock_hold(gl);
         gl->gl_req_bh = drop_bh;
@@ -1041,9 +1033,8 @@ static void do_cancels(struct gfs2_holder *gh)
         while (gl->gl_req_gh != gh &&
                !test_bit(HIF_HOLDER, &gh->gh_iflags) &&
                !list_empty(&gh->gh_list)) {
-                if (gl->gl_req_bh &&
-                    !(gl->gl_req_gh &&
-                      (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) {
+                if (gl->gl_req_bh && !(gl->gl_req_gh &&
+                                     (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) {
                         spin_unlock(&gl->gl_spin);
                         gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock);
                         msleep(100);
@@ -1323,10 +1314,8 @@ static void gfs2_glock_prefetch(struct gfs2_glock *gl, unsigned int state,
 
         spin_lock(&gl->gl_spin);
 
-        if (test_bit(GLF_LOCK, &gl->gl_flags) ||
-            !list_empty(&gl->gl_holders) ||
-            !list_empty(&gl->gl_waiters1) ||
-            !list_empty(&gl->gl_waiters2) ||
+        if (test_bit(GLF_LOCK, &gl->gl_flags) || !list_empty(&gl->gl_holders) ||
+            !list_empty(&gl->gl_waiters1) || !list_empty(&gl->gl_waiters2) ||
             !list_empty(&gl->gl_waiters3) ||
             relaxed_state_ok(gl->gl_state, state, flags)) {
                 spin_unlock(&gl->gl_spin);
@@ -1690,19 +1679,6 @@ void gfs2_lvb_unhold(struct gfs2_glock *gl)
         gfs2_glock_put(gl);
 }
 
-#if 0
-void gfs2_lvb_sync(struct gfs2_glock *gl)
-{
-        gfs2_glmutex_lock(gl);
-
-        gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count));
-        if (!gfs2_assert_warn(gl->gl_sbd, gfs2_glock_is_held_excl(gl)))
-                gfs2_lm_sync_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb);
-
-        gfs2_glmutex_unlock(gl);
-}
-#endif  /*  0  */
-
 static void blocking_cb(struct gfs2_sbd *sdp, struct lm_lockname *name,
                         unsigned int state)
 {
@@ -1813,8 +1789,7 @@ static int demote_ok(struct gfs2_glock *gl)
         if (test_bit(GLF_STICKY, &gl->gl_flags))
                 demote = 0;
         else if (test_bit(GLF_PREFETCH, &gl->gl_flags))
-                demote = time_after_eq(jiffies,
-                                    gl->gl_stamp +
+                demote = time_after_eq(jiffies, gl->gl_stamp +
                                     gfs2_tune_get(sdp, gt_prefetch_secs) * HZ);
         else if (glops->go_demote_ok)
                 demote = glops->go_demote_ok(gl);
@@ -1872,8 +1847,7 @@ void gfs2_reclaim_glock(struct gfs2_sbd *sdp)
 
         if (gfs2_glmutex_trylock(gl)) {
                 if (queue_empty(gl, &gl->gl_holders) &&
-                    gl->gl_state != LM_ST_UNLOCKED &&
-                    demote_ok(gl))
+                    gl->gl_state != LM_ST_UNLOCKED && demote_ok(gl))
                         handle_callback(gl, LM_ST_UNLOCKED);
                 gfs2_glmutex_unlock(gl);
         }
@@ -2036,8 +2010,7 @@ void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait)
                 cont = 0;
 
                 for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
-                        if (examine_bucket(clear_glock, sdp,
-                                           &sdp->sd_gl_hash[x]))
+                        if (examine_bucket(clear_glock, sdp, &sdp->sd_gl_hash[x]))
                                 cont = 1;
 
                 if (!wait || !cont)
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 07a8d02a234d..1a90a1983beb 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -51,17 +51,17 @@ static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
 
 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
 {
-        return (gl->gl_state == LM_ST_EXCLUSIVE);
+        return gl->gl_state == LM_ST_EXCLUSIVE;
 }
 
 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
 {
-        return (gl->gl_state == LM_ST_DEFERRED);
+        return gl->gl_state == LM_ST_DEFERRED;
 }
 
 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
 {
-        return (gl->gl_state == LM_ST_SHARED);
+        return gl->gl_state == LM_ST_SHARED;
 }
 
 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
diff --git a/fs/gfs2/lm.c b/fs/gfs2/lm.c
index 1a9e75da19d1..fb918c7de655 100644
--- a/fs/gfs2/lm.c
+++ b/fs/gfs2/lm.c
@@ -124,10 +124,8 @@ int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
 int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
                      lm_lock_t **lockp)
 {
-        int error;
-        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                error = -EIO;
-        else
+        int error = -EIO;
+        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                 error = sdp->sd_lockstruct.ls_ops->lm_get_lock(
                                 sdp->sd_lockstruct.ls_lockspace, name, lockp);
         return error;
@@ -143,12 +141,9 @@ unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, lm_lock_t *lock,
                           unsigned int cur_state, unsigned int req_state,
                           unsigned int flags)
 {
-        int ret;
-        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                ret = 0;
-        else
-                ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock,
-                                                         cur_state,
+        int ret = 0;
+        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+                ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock, cur_state,
                                                          req_state, flags);
         return ret;
 }
@@ -156,10 +151,8 @@ unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, lm_lock_t *lock,
 unsigned int gfs2_lm_unlock(struct gfs2_sbd *sdp, lm_lock_t *lock,
                             unsigned int cur_state)
 {
-        int ret;
-        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                ret = 0;
-        else
+        int ret = 0;
+        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                 ret =  sdp->sd_lockstruct.ls_ops->lm_unlock(lock, cur_state);
         return ret;
 }
@@ -172,10 +165,8 @@ void gfs2_lm_cancel(struct gfs2_sbd *sdp, lm_lock_t *lock)
 
 int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char **lvbp)
 {
-        int error;
-        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                error = -EIO;
-        else
+        int error = -EIO;
+        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                 error = sdp->sd_lockstruct.ls_ops->lm_hold_lvb(lock, lvbp);
         return error;
 }
@@ -186,50 +177,33 @@ void gfs2_lm_unhold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char *lvb)
                 sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(lock, lvb);
 }
 
-#if 0
-void gfs2_lm_sync_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char *lvb)
-{
-        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                sdp->sd_lockstruct.ls_ops->lm_sync_lvb(lock, lvb);
-}
-#endif  /*  0  */
-
 int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name,
                       struct file *file, struct file_lock *fl)
 {
-        int error;
-        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                error = -EIO;
-        else
+        int error = -EIO;
+        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                 error = sdp->sd_lockstruct.ls_ops->lm_plock_get(
-                        sdp->sd_lockstruct.ls_lockspace,
-                        name, file, fl);
+                                sdp->sd_lockstruct.ls_lockspace, name, file, fl);
         return error;
 }
 
 int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name,
                   struct file *file, int cmd, struct file_lock *fl)
 {
-        int error;
-        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                error = -EIO;
-        else
+        int error = -EIO;
+        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                 error = sdp->sd_lockstruct.ls_ops->lm_plock(
-                        sdp->sd_lockstruct.ls_lockspace,
-                        name, file, cmd, fl);
+                                sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl);
         return error;
 }
 
 int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name,
                     struct file *file, struct file_lock *fl)
 {
-        int error;
-        if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                error = -EIO;
-        else
+        int error = -EIO;
+        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                 error = sdp->sd_lockstruct.ls_ops->lm_punlock(
-                        sdp->sd_lockstruct.ls_lockspace,
-                        name, file, fl);
+                                sdp->sd_lockstruct.ls_lockspace, name, file, fl);
         return error;
 }
 
diff --git a/fs/gfs2/lm.h b/fs/gfs2/lm.h
index 15839aaa4ca6..dbef88852ef3 100644
--- a/fs/gfs2/lm.h
+++ b/fs/gfs2/lm.h
@@ -16,9 +16,9 @@ int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent);
 void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp);
 void gfs2_lm_unmount(struct gfs2_sbd *sdp);
 int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
-__attribute__ ((format(printf, 2, 3)));
-int gfs2_lm_get_lock(struct gfs2_sbd *sdp,
-                    struct lm_lockname *name, lm_lock_t **lockp);
+                                __attribute__ ((format(printf, 2, 3)));
+int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
+                     lm_lock_t **lockp);
 void gfs2_lm_put_lock(struct gfs2_sbd *sdp, lm_lock_t *lock);
 unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, lm_lock_t *lock,
                          unsigned int cur_state, unsigned int req_state,
@@ -28,16 +28,13 @@ unsigned int gfs2_lm_unlock(struct gfs2_sbd *sdp, lm_lock_t *lock,
 void gfs2_lm_cancel(struct gfs2_sbd *sdp, lm_lock_t *lock);
 int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char **lvbp);
 void gfs2_lm_unhold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char *lvb);
-int gfs2_lm_plock_get(struct gfs2_sbd *sdp,
-                     struct lm_lockname *name,
-                     struct file *file, struct file_lock *fl);
-int gfs2_lm_plock(struct gfs2_sbd *sdp,
-                 struct lm_lockname *name,
-                 struct file *file, int cmd, struct file_lock *fl);
-int gfs2_lm_punlock(struct gfs2_sbd *sdp,
-                   struct lm_lockname *name,
-                   struct file *file, struct file_lock *fl);
-void gfs2_lm_recovery_done(struct gfs2_sbd *sdp,
-                          unsigned int jid, unsigned int message);
+int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name,
+                      struct file *file, struct file_lock *fl);
+int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name,
+                  struct file *file, int cmd, struct file_lock *fl);
+int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name,
+                    struct file *file, struct file_lock *fl);
+void gfs2_lm_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
+                           unsigned int message);
 
 #endif /* __LM_DOT_H__ */
diff --git a/fs/gfs2/lm_interface.h b/fs/gfs2/lm_interface.h
index e1e89d92a8db..0bf4c276e0fe 100644
--- a/fs/gfs2/lm_interface.h
+++ b/fs/gfs2/lm_interface.h
@@ -260,8 +260,6 @@ struct lm_lockstruct {
         int ls_flags;
 };
 
-void __init gfs2_init_lmh(void);
-
 /*
  * Lock module bottom interface.  A lock module makes itself available to GFS
  * with these functions.
diff --git a/fs/gfs2/locking.c b/fs/gfs2/locking.c
index 11c4068105cc..fce2001e5e25 100644
--- a/fs/gfs2/locking.c
+++ b/fs/gfs2/locking.c
@@ -27,8 +27,8 @@ struct lmh_wrapper {
 /* List of registered low-level locking protocols.  A file system selects one
    of them by name at mount time, e.g. lock_nolock, lock_dlm. */
 
-static struct list_head lmh_list;
-static struct mutex lmh_lock;
+static LIST_HEAD(lmh_list);
+static DEFINE_MUTEX(lmh_lock);
 
 /**
  * gfs2_register_lockproto - Register a low-level locking protocol
@@ -180,12 +180,6 @@ void gfs2_withdraw_lockproto(struct lm_lockstruct *lockstruct)
         mutex_unlock(&lmh_lock);
 }
 
-void __init gfs2_init_lmh(void)
-{
-        mutex_init(&lmh_lock);
-        INIT_LIST_HEAD(&lmh_list);
-}
-
 EXPORT_SYMBOL_GPL(gfs2_register_lockproto);
 EXPORT_SYMBOL_GPL(gfs2_unregister_lockproto);
 
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index b46f400705a2..143fda727a9c 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -65,8 +65,6 @@ static int __init init_gfs2_fs(void)
 {
         int error;
 
-        gfs2_init_lmh();
-
         error = gfs2_sys_init();
         if (error)
                 return error;