[LogFS] Clear PagePrivate when moving journal

do_logfs_journal_wl_pass() must call freeseg(), thereby clear
PagePrivate on all pages of the current journal segment.
Signed-off-by: Joern Engel <joern@logfs.org>

fs/logfs/journal.c

@@ -821,6 +821,7 @@ void do_logfs_journal_wl_pass(struct super_block *sb)
 		logfs_set_segment_reserved(sb, segno);
 	}
 	/* Manually move journal_area */
+	freeseg(sb, area->a_segno);
 	area->a_segno = super->s_journal_seg[0];
 	area->a_is_open = 0;
 	area->a_used_bytes = 0;

fs/logfs/logfs.h

@@ -587,6 +587,7 @@ void move_page_to_btree(struct page *page);
 int logfs_init_mapping(struct super_block *sb);
 void logfs_sync_area(struct logfs_area *area);
 void logfs_sync_segments(struct super_block *sb);
+void freeseg(struct super_block *sb, u32 segno);
 
 /* area handling */
 int logfs_init_areas(struct super_block *sb);

fs/logfs/segment.c

@@ -691,7 +691,7 @@ int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow)
 	return 0;
 }
 
-static void freeseg(struct super_block *sb, u32 segno)
+void freeseg(struct super_block *sb, u32 segno)
 {
 	struct logfs_super *super = logfs_super(sb);
 	struct address_space *mapping = super->s_mapping_inode->i_mapping;