[GFS2] Remove lm.[ch] and distribute content

The functions in lm.c were just wrappers which were mostly
only used in one other file. By moving the functions to
the files where they are being used, they can be marked
static and also this will usually result in them being inlined
since they are often only used from one point in the code.

A couple of really trivial functions have been inlined by hand
into the function which called them as it makes the code clearer
to do that.

We also gain from one fewer function call in the glock lock and
unlock paths.

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

fs/gfs2/Makefile

@@ -1,6 +1,6 @@
 obj-$(CONFIG_GFS2_FS) += gfs2.o
 gfs2-y := acl.o bmap.o daemon.o dir.o eaops.o eattr.o glock.o \
-	glops.o inode.o lm.o log.o lops.o locking.o main.o meta_io.o \
+	glops.o inode.o log.o lops.o locking.o main.o meta_io.o \
 	mount.o ops_address.o ops_dentry.o ops_export.o ops_file.o \
 	ops_fstype.o ops_inode.o ops_super.o quota.o \
 	recovery.o rgrp.o super.o sys.o trans.o util.o

fs/gfs2/glock.c

@@ -35,7 +35,6 @@
 #include "glock.h"
 #include "glops.h"
 #include "inode.h"
-#include "lm.h"
 #include "lops.h"
 #include "meta_io.h"
 #include "quota.h"
@@ -183,7 +182,8 @@ static void glock_free(struct gfs2_glock *gl)
 	struct gfs2_sbd *sdp = gl->gl_sbd;
 	struct inode *aspace = gl->gl_aspace;
 
-	gfs2_lm_put_lock(sdp, gl->gl_lock);
+	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+		sdp->sd_lockstruct.ls_ops->lm_put_lock(gl->gl_lock);
 
 	if (aspace)
 		gfs2_aspace_put(aspace);
@@ -293,6 +293,16 @@ static void glock_work_func(struct work_struct *work)
 	gfs2_glock_put(gl);
 }
 
+static int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
+		     void **lockp)
+{
+	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;
+}
+
 /**
  * gfs2_glock_get() - Get a glock, or create one if one doesn't exist
  * @sdp: The GFS2 superblock
@@ -882,6 +892,17 @@ static void xmote_bh(struct gfs2_glock *gl, unsigned int ret)
 		gfs2_holder_wake(gh);
 }
 
+static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
+				 unsigned int cur_state, unsigned int req_state,
+				 unsigned int flags)
+{
+	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;
+}
+
 /**
  * gfs2_glock_xmote_th - Call into the lock module to acquire or change a glock
  * @gl: The glock in question
@@ -922,6 +943,15 @@ static void gfs2_glock_xmote_th(struct gfs2_glock *gl, struct gfs2_holder *gh)
 		xmote_bh(gl, lck_ret);
 }
 
+static unsigned int gfs2_lm_unlock(struct gfs2_sbd *sdp, void *lock,
+				   unsigned int cur_state)
+{
+	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;
+}
+
 /**
  * gfs2_glock_drop_th - call into the lock module to unlock a lock
  * @gl: the glock
@@ -964,6 +994,7 @@ static void gfs2_glock_drop_th(struct gfs2_glock *gl)
 static void do_cancels(struct gfs2_holder *gh)
 {
 	struct gfs2_glock *gl = gh->gh_gl;
+	struct gfs2_sbd *sdp = gl->gl_sbd;
 
 	spin_lock(&gl->gl_spin);
 
@@ -972,7 +1003,8 @@ static void do_cancels(struct gfs2_holder *gh)
 	       !list_empty(&gh->gh_list)) {
 		if (!(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);
+			if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+				sdp->sd_lockstruct.ls_ops->lm_cancel(gl->gl_lock);
 			msleep(100);
 			spin_lock(&gl->gl_spin);
 		} else {
@@ -1426,6 +1458,14 @@ void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs)
 		gfs2_glock_dq_uninit(&ghs[x]);
 }
 
+static int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, void *lock, char **lvbp)
+{
+	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;
+}
+
 /**
  * gfs2_lvb_hold - attach a LVB from a glock
  * @gl: The glock in question
@@ -1461,12 +1501,15 @@ int gfs2_lvb_hold(struct gfs2_glock *gl)
 
 void gfs2_lvb_unhold(struct gfs2_glock *gl)
 {
+	struct gfs2_sbd *sdp = gl->gl_sbd;
+
 	gfs2_glock_hold(gl);
 	gfs2_glmutex_lock(gl);
 
 	gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_lvb_count) > 0);
 	if (atomic_dec_and_test(&gl->gl_lvb_count)) {
-		gfs2_lm_unhold_lvb(gl->gl_sbd, gl->gl_lock, gl->gl_lvb);
+		if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+			sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(gl->gl_lock, gl->gl_lvb);
 		gl->gl_lvb = NULL;
 		gfs2_glock_put(gl);
 	}

fs/gfs2/incore.h

@@ -211,6 +211,8 @@ struct gfs2_glock {
 	struct delayed_work gl_work;
 };
 
+#define GFS2_MIN_LVB_SIZE 32	/* Min size of LVB that gfs2 supports */
+
 struct gfs2_alloc {
 	/* Quota stuff */