[U-Boot] [PATCH v2 8/8] JFFS2: Use merge sort when parsing filesystem

[Mark Tomlinson]

When building the file system the existing code does an insertion into
a linked list. It attempts to speed this up by keeping a pointer to
where the last entry was inserted but it's still slow.

Now the nodes are just inserted into the list without searching
through for the correct place. This unsorted list is then sorted once
using mergesort after all the entries have been added to the list.
This speeds up the scanning of the flash file system considerably.

Signed-off-by: Mark Tomlinson <mark.tomlinson at alliedtelesis.co.nz>

---

Changes in v2:
- Changed copyright notice to use SPDX-Licence-Identifier.
- Added URL to original mergesort code.
- Removed #ifdef, using Makefile change instead.

 fs/jffs2/Makefile        |  1 +
 fs/jffs2/jffs2_1pass.c   | 47 +++++++++++--------------------------------
 fs/jffs2/jffs2_private.h |  4 ++++
 fs/jffs2/mergesort.c     | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 69 insertions(+), 35 deletions(-)
 create mode 100644 fs/jffs2/mergesort.c

diff --git a/fs/jffs2/Makefile b/fs/jffs2/Makefile
index 4cb0600..3625d74 100644
--- a/fs/jffs2/Makefile
+++ b/fs/jffs2/Makefile
@@ -10,4 +10,5 @@ obj-y += compr_rtime.o
 obj-y += compr_rubin.o
 obj-y += compr_zlib.o
 obj-y += jffs2_1pass.o
+obj-$(CONFIG_SYS_JFFS2_SORT_FRAGMENTS) += mergesort.o
 obj-y += mini_inflate.o
diff --git a/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c
index 4325792..64f5542 100644
--- a/fs/jffs2/jffs2_1pass.c
+++ b/fs/jffs2/jffs2_1pass.c
@@ -545,49 +545,19 @@ static struct b_node *
 insert_node(struct b_list *list, u32 offset)
 {
 	struct b_node *new;
-#ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
-	struct b_node *b, *prev;
-#endif
 
 	if (!(new = add_node(list))) {
 		putstr("add_node failed!\r\n");
 		return NULL;
 	}
 	new->offset = offset;
+	new->next = NULL;
 
-#ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
-	if (list->listTail != NULL && list->listCompare(new, list->listTail))
-		prev = list->listTail;
-	else if (list->listLast != NULL && list->listCompare(new, list->listLast))
-		prev = list->listLast;
+	if (list->listTail != NULL)
+		list->listTail->next = new;
 	else
-		prev = NULL;
-
-	for (b = (prev ? prev->next : list->listHead);
-	     b != NULL && list->listCompare(new, b);
-	     prev = b, b = b->next) {
-		list->listLoops++;
-	}
-	if (b != NULL)
-		list->listLast = prev;
-
-	if (b != NULL) {
-		new->next = b;
-		if (prev != NULL)
-			prev->next = new;
-		else
-			list->listHead = new;
-	} else
-#endif
-	{
-		new->next = (struct b_node *) NULL;
-		if (list->listTail != NULL) {
-			list->listTail->next = new;
-			list->listTail = new;
-		} else {
-			list->listTail = list->listHead = new;
-		}
-	}
+		list->listHead = new;
+	list->listTail = new;
 
 	return new;
 }
@@ -1800,6 +1770,13 @@ jffs2_1pass_build_lists(struct part_info * part)
 	}
 
 	free(buf);
+#if defined(CONFIG_SYS_JFFS2_SORT_FRAGMENTS)
+	/*
+	 * Sort the lists.
+	 */
+	sort_list(&pL->frag);
+	sort_list(&pL->dir);
+#endif
 	putstr("\b\b done.\r\n");		/* close off the dots */
 
 	/* We don't care if malloc failed - then each read operation will
diff --git a/fs/jffs2/jffs2_private.h b/fs/jffs2/jffs2_private.h
index 658b325..06b6ca2 100644
--- a/fs/jffs2/jffs2_private.h
+++ b/fs/jffs2/jffs2_private.h
@@ -98,4 +98,8 @@ data_crc(struct jffs2_raw_inode *node)
 	}
 }
 
+#if defined(CONFIG_SYS_JFFS2_SORT_FRAGMENTS)
+/* External merge sort. */
+int sort_list(struct b_list *list);
+#endif
 #endif /* jffs2_private.h */
diff --git a/fs/jffs2/mergesort.c b/fs/jffs2/mergesort.c
new file mode 100644
index 0000000..6e633a1
--- /dev/null
+++ b/fs/jffs2/mergesort.c
@@ -0,0 +1,52 @@
+/*
+ * This file is copyright 2001 Simon Tatham.
+ * Rewritten from original source 2006 by Dan Merillat for use in u-boot.
+ *
+ * Original code can be found at:
+ * http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html
+ *
+ * SPDX-License-Identifier:	MIT
+ */
+
+#include <common.h>
+#include "jffs2_private.h"
+
+int sort_list(struct b_list *list)
+{
+	struct b_node *p, *q, *e, **tail;
+	int k, psize, qsize;
+
+	if (!list->listHead)
+		return 0;
+
+	for (k = 1; k < list->listCount; k *= 2) {
+		tail = &list->listHead;
+		for (p = q = list->listHead; p; p = q) {
+			/* step 'k' places from p; */
+			for (psize = 0; q && psize < k; psize++)
+				q = q->next;
+			qsize = k;
+
+			/* two lists, merge them. */
+			while (psize || (qsize && q)) {
+				/* merge the next element */
+				if (psize == 0 ||
+				    ((qsize && q) &&
+				     list->listCompare(p, q))) {
+					/* p is empty, or p > q, so q next */
+					e = q;
+					q = q->next;
+					qsize--;
+				} else {
+					e = p;
+					p = p->next;
+					psize--;
+				}
+				e->next = NULL; /* break accidental loops. */
+				*tail = e;
+				tail = &e->next;
+			}
+		}
+	}
+	return 0;
+}
-- 
1.9.1