Revert "gfs2: Force withdraw to replay journals and wait for it to finish" (2/6)

The current withdraw code duplicates the journal recovery code gfs2
already has for dealing with node failures, and it does so poorly.  That
code was added because when releasing a lockspace, we didn't have a way
to indicate that the lockspace needs recovery.  We now do have this
feature, so the current withdraw code can be removed almost entirely.
This is one of several steps towards that.

Reverts parts of commit 601ef0d ("gfs2: Force withdraw to replay
journals and wait for it to finish").

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Author: Andreas Gruenbacher

fs/gfs2/glock.c

@@ -2312,8 +2312,6 @@ static const char *gflags2str(char *buf, const struct gfs2_glock *gl)
 		*p++ = 'o';
 	if (test_bit(GLF_BLOCKING, gflags))
 		*p++ = 'b';
-	if (test_bit(GLF_UNLOCKED, gflags))
-		*p++ = 'x';
 	if (test_bit(GLF_INSTANTIATE_NEEDED, gflags))
 		*p++ = 'n';
 	if (test_bit(GLF_INSTANTIATE_IN_PROG, gflags))

fs/gfs2/glops.c

@@ -638,24 +638,6 @@ static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
 	}
 }
 
-/**
- * inode_go_unlocked - wake up anyone waiting for dlm's unlock ast
- * @gl: glock being unlocked
- *
- * For now, this is only used for the journal inode glock. In withdraw
- * situations, we need to wait for the glock to be unlocked so that we know
- * other nodes may proceed with recovery / journal replay.
- */
-static void inode_go_unlocked(struct gfs2_glock *gl)
-{
-	/* Note that we cannot reference gl_object because it's already set
-	 * to NULL by this point in its lifecycle. */
-	if (!test_bit(GLF_UNLOCKED, &gl->gl_flags))
-		return;
-	clear_bit_unlock(GLF_UNLOCKED, &gl->gl_flags);
-	wake_up_bit(&gl->gl_flags, GLF_UNLOCKED);
-}
-
 /**
  * nondisk_go_callback - used to signal when a node did a withdraw
  * @gl: the nondisk glock
@@ -718,7 +700,6 @@ const struct gfs2_glock_operations gfs2_inode_glops = {
 	.go_dump = inode_go_dump,
 	.go_type = LM_TYPE_INODE,
 	.go_flags = GLOF_ASPACE | GLOF_LVB,
-	.go_unlocked = inode_go_unlocked,
 };
 
 const struct gfs2_glock_operations gfs2_rgrp_glops = {

fs/gfs2/incore.h

@@ -223,7 +223,6 @@ struct gfs2_glock_operations {
 	void (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl,
 			const char *fs_id_buf);
 	void (*go_callback)(struct gfs2_glock *gl, bool remote);
-	void (*go_unlocked)(struct gfs2_glock *gl);
 	const int go_subclass;
 	const int go_type;
 	const unsigned long go_flags;
@@ -326,7 +325,6 @@ enum {
 	GLF_LRU				= 13,
 	GLF_OBJECT			= 14, /* Used only for tracing */
 	GLF_BLOCKING			= 15,
-	GLF_UNLOCKED			= 16, /* Wait for glock to be unlocked */
 	GLF_TRY_TO_EVICT		= 17, /* iopen glocks only */
 	GLF_VERIFY_DELETE		= 18, /* iopen glocks only */
 	GLF_PENDING_REPLY		= 19,

fs/gfs2/lock_dlm.c

@@ -15,8 +15,6 @@
 #include <linux/sched/signal.h>
 
 #include "incore.h"
-#include "glock.h"
-#include "glops.h"
 #include "recovery.h"
 #include "util.h"
 #include "sys.h"
@@ -139,8 +137,6 @@ static void gdlm_ast(void *arg)
 
 	switch (gl->gl_lksb.sb_status) {
 	case -DLM_EUNLOCK: /* Unlocked, so glock can be freed */
-		if (gl->gl_ops->go_unlocked)
-			gl->gl_ops->go_unlocked(gl);
 		gfs2_glock_free(gl);
 		return;
 	case -DLM_ECANCEL: /* Cancel while getting lock */

fs/gfs2/trace_gfs2.h

@@ -59,7 +59,6 @@
 	{(1UL << GLF_LRU),			"L" },		\
 	{(1UL << GLF_OBJECT),			"o" },		\
 	{(1UL << GLF_BLOCKING),			"b" },		\
-	{(1UL << GLF_UNLOCKED),			"x" },		\
 	{(1UL << GLF_INSTANTIATE_NEEDED),	"n" },		\
 	{(1UL << GLF_INSTANTIATE_IN_PROG),	"N" },		\
 	{(1UL << GLF_TRY_TO_EVICT),		"e" },		\

fs/gfs2/util.c

@@ -198,16 +198,6 @@ static void signal_our_withdraw(struct gfs2_sbd *sdp)
 	 */
 	iput(inode);
 	sdp->sd_jdesc->jd_inode = NULL;
-	/*
-	 * Wait until the journal inode's glock is freed. This allows try locks
-	 * on other nodes to be successful, otherwise we remain the owner of
-	 * the glock as far as dlm is concerned.
-	 */
-	if (i_gl->gl_ops->go_unlocked) {
-		set_bit(GLF_UNLOCKED, &i_gl->gl_flags);
-		wait_on_bit(&i_gl->gl_flags, GLF_UNLOCKED, TASK_UNINTERRUPTIBLE);
-	}
-
 	/*
 	 * Dequeue the "live" glock, but keep a reference so it's never freed.
 	 */