[JFFS2] Introduce ref_next() macro for finding next physical node

Another part of the preparation for switching to an array...
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/debug.c

@@ -192,13 +192,13 @@ __jffs2_dbg_acct_paranoia_check_nolock(struct jffs2_sb_info *c,
 		else
 			my_dirty_size += totlen;
 
-		if ((!ref2->next_phys) != (ref2 == jeb->last_node)) {
-			JFFS2_ERROR("node_ref for node at %#08x (mem %p) has next_phys at %#08x (mem %p), last_node is at %#08x (mem %p).\n",
-				ref_offset(ref2), ref2, ref_offset(ref2->next_phys), ref2->next_phys,
-				ref_offset(jeb->last_node), jeb->last_node);
+		if ((!ref_next(ref2)) != (ref2 == jeb->last_node)) {
+			JFFS2_ERROR("node_ref for node at %#08x (mem %p) has next at %#08x (mem %p), last_node is at %#08x (mem %p).\n",
+				    ref_offset(ref2), ref2, ref_offset(ref_next(ref2)), ref_next(ref2),
+				    ref_offset(jeb->last_node), jeb->last_node);
 			goto error;
 		}
-		ref2 = ref2->next_phys;
+		ref2 = ref_next(ref2);
 	}
 
 	if (my_used_size != jeb->used_size) {
@@ -268,9 +268,9 @@ __jffs2_dbg_dump_node_refs_nolock(struct jffs2_sb_info *c,
 	}
 
 	printk(JFFS2_DBG);
-	for (ref = jeb->first_node; ; ref = ref->next_phys) {
+	for (ref = jeb->first_node; ; ref = ref_next(ref)) {
 		printk("%#08x(%#x)", ref_offset(ref), ref->__totlen);
-		if (ref->next_phys)
+		if (ref_next(ref))
 			printk("->");
 		else
 			break;

fs/jffs2/gc.c

@@ -239,7 +239,7 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
 
 	while(ref_obsolete(raw)) {
 		D1(printk(KERN_DEBUG "Node at 0x%08x is obsolete... skipping\n", ref_offset(raw)));
-		raw = raw->next_phys;
+		raw = ref_next(raw);
 		if (unlikely(!raw)) {
 			printk(KERN_WARNING "eep. End of raw list while still supposedly nodes to GC\n");
 			printk(KERN_WARNING "erase block at 0x%08x. free_size 0x%08x, dirty_size 0x%08x, used_size 0x%08x\n",

fs/jffs2/nodelist.c

@@ -1159,9 +1159,10 @@ static inline uint32_t __ref_totlen(struct jffs2_sb_info *c,
 				    struct jffs2_raw_node_ref *ref)
 {
 	uint32_t ref_end;
+	struct jffs2_raw_node_ref *next_ref = ref_next(ref);
 
-	if (ref->next_phys)
-		ref_end = ref_offset(ref->next_phys);
+	if (next_ref)
+		ref_end = ref_offset(next_ref);
 	else {
 		if (!jeb)
 			jeb = &c->blocks[ref->flash_offset / c->sector_size];
@@ -1196,11 +1197,11 @@ uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c, struct jffs2_eraseblock *je
 		printk(KERN_CRIT "Totlen for ref at %p (0x%08x-0x%08x) miscalculated as 0x%x instead of %x\n",
 		       ref, ref_offset(ref), ref_offset(ref)+ref->__totlen,
 		       ret, ref->__totlen);
-		if (ref->next_phys) {
-			printk(KERN_CRIT "next_phys %p (0x%08x-0x%08x)\n", ref->next_phys, ref_offset(ref->next_phys),
-			       ref_offset(ref->next_phys)+ref->__totlen);
+		if (ref_next(ref)) {
+			printk(KERN_CRIT "next %p (0x%08x-0x%08x)\n", ref_next(ref), ref_offset(ref_next(ref)),
+			       ref_offset(ref_next(ref))+ref->__totlen);
 		} else 
-			printk(KERN_CRIT "No next_phys. jeb->last_node is %p\n", jeb->last_node);
+			printk(KERN_CRIT "No next ref. jeb->last_node is %p\n", jeb->last_node);
 
 		printk(KERN_CRIT "jeb->wasted_size %x, dirty_size %x, used_size %x, free_size %x\n", jeb->wasted_size, jeb->dirty_size, jeb->used_size, jeb->free_size);
 		ret = ref->__totlen;

fs/jffs2/nodelist.h

@@ -88,18 +88,18 @@ struct jffs2_raw_node_ref
 #endif
 };
 
+#define ref_next(r) ((r)->next_phys)
+
 static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
 {
-	while(raw->next_in_ino) {
+	while(raw->next_in_ino)
 		raw = raw->next_in_ino;
-	}
 
 	/* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and
 	   not actually a jffs2_inode_cache. Check ->class */
 	return ((struct jffs2_inode_cache *)raw);
 }
 
-
         /* flash_offset & 3 always has to be zero, because nodes are
 	   always aligned at 4 bytes. So we have a couple of extra bits
 	   to play with, which indicate the node's status; see below: */

fs/jffs2/nodemgmt.c

@@ -458,6 +458,7 @@ static inline int on_list(struct list_head *obj, struct list_head *head)
 void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref)
 {
 	struct jffs2_eraseblock *jeb;
+	struct jffs2_raw_node_ref *next_ref;
 	int blocknr;
 	struct jffs2_unknown_node n;
 	int ret, addedsize;
@@ -685,24 +686,23 @@ void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref
 
 	/* Merge with the next node in the physical list, if there is one
 	   and if it's also obsolete and if it doesn't belong to any inode */
-	if (ref->next_phys && ref_obsolete(ref->next_phys) &&
-	    !ref->next_phys->next_in_ino) {
-		struct jffs2_raw_node_ref *n = ref->next_phys;
+	next_ref = ref_next(ref);
 
+	if (next_ref && ref_obsolete(next_ref) && !next_ref->next_in_ino) {
 		spin_lock(&c->erase_completion_lock);
 
 #ifdef TEST_TOTLEN
-		ref->__totlen += n->__totlen;
+		ref->__totlen += next_ref->__totlen;
 #endif
-		ref->next_phys = n->next_phys;
-                if (jeb->last_node == n) jeb->last_node = ref;
-		if (jeb->gc_node == n) {
+		ref->next_phys = ref_next(next_ref);
+                if (jeb->last_node == next_ref) jeb->last_node = ref;
+		if (jeb->gc_node == next_ref) {
 			/* gc will be happy continuing gc on this node */
 			jeb->gc_node=ref;
 		}
 		spin_unlock(&c->erase_completion_lock);
 
-		__jffs2_free_raw_node_ref(n);
+		__jffs2_free_raw_node_ref(next_ref);
 	}
 
 	/* Also merge with the previous node in the list, if there is one
@@ -712,8 +712,8 @@ void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref
 
 		spin_lock(&c->erase_completion_lock);
 
-		while (p->next_phys != ref)
-			p = p->next_phys;
+		while ((next_ref = ref_next(ref)) != ref)
+			p = next_ref;
 
 		if (ref_obsolete(p) && !ref->next_in_ino) {
 #ifdef TEST_TOTLEN
@@ -726,7 +726,7 @@ void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref
 				/* gc will be happy continuing gc on this node */
 				jeb->gc_node=p;
 			}
-			p->next_phys = ref->next_phys;
+			p->next_phys = ref_next(ref);
 			__jffs2_free_raw_node_ref(ref);
 		}
 		spin_unlock(&c->erase_completion_lock);

fs/jffs2/scan.c

@@ -295,7 +295,7 @@ int jffs2_fill_scan_buf (struct jffs2_sb_info *c, void *buf,
 int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 {
 	if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size
-		&& (!jeb->first_node || !jeb->first_node->next_phys) )
+	    && (!jeb->first_node || !ref_next(jeb->first_node)) )
 		return BLK_STATE_CLEANMARKER;
 
 	/* move blocks with max 4 byte dirty space to cleanlist */
@@ -647,7 +647,7 @@ scan_more:
 			/* If we're only checking the beginning of a block with a cleanmarker,
 			   bail now */
 			if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
-			    c->cleanmarker_size && !jeb->dirty_size && !jeb->first_node->next_phys) {
+			    c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) {
 				D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)));
 				return BLK_STATE_CLEANMARKER;
 			}