btrfs-progs: move ulist.[ch] to kernel-shared

The implementation of ulist_* is same for kernel and userspace, without
dependencies, so we can keep it separately for code sync.

Signed-off-by: David Sterba <dsterba@suse.com>

Makefile

@@ -93,7 +93,7 @@ objects = ctree.o disk-io.o kernel-lib/radix-tree.o extent-tree.o print-tree.o \
 	  root-tree.o dir-item.o file-item.o inode-item.o inode-map.o \
 	  extent-cache.o extent_io.o volumes.o utils.o repair.o \
 	  qgroup.o raid56.o free-space-cache.o kernel-lib/list_sort.o props.o \
-	  ulist.o qgroup-verify.o backref.o string-table.o task-utils.o \
+	  kernel-shared/ulist.o qgroup-verify.o backref.o string-table.o task-utils.o \
 	  inode.o file.o find-root.o free-space-tree.o help.o send-dump.o \
 	  fsfeatures.o messages.o
 cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \

backref.c

@@ -20,7 +20,7 @@
 #include "ctree.h"
 #include "disk-io.h"
 #include "backref.h"
-#include "ulist.h"
+#include "kernel-shared/ulist.h"
 #include "transaction.h"
 #include "internal.h"
 

backref.h

@@ -19,7 +19,7 @@
 #ifndef __BTRFS_BACKREF_H__
 #define __BTRFS_BACKREF_H__
 
-#include "ulist.h"
+#include "kernel-shared/ulist.h"
 #include "extent_io.h"
 
 struct inode_fs_paths {

cmds-check.c

@@ -40,7 +40,7 @@
 #include "qgroup-verify.h"
 #include "rbtree-utils.h"
 #include "backref.h"
-#include "ulist.h"
+#include "kernel-shared/ulist.h"
 #include "hash.h"
 #include "help.h"
 

qgroup-verify.c

@@ -27,7 +27,7 @@
 #include "disk-io.h"
 #include "print-tree.h"
 #include "utils.h"
-#include "ulist.h"
+#include "kernel-shared/ulist.h"
 #include "rbtree-utils.h"
 #include "transaction.h"
 #include "repair.h"