diff --git a/code/autobuild.sh b/code/autobuild.sh
new file mode 100755
index 0000000..e0d39d6
--- /dev/null
+++ b/code/autobuild.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# Nothing to be done here
+exit 0
diff --git a/code/autotest.sh b/code/autotest.sh
new file mode 100755
index 0000000..1ce5b53
--- /dev/null
+++ b/code/autotest.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+BASE_COMMIT=95a80f598fc57c60aed3737c60ee437d94eb8540
+LABS=`git diff $BASE_COMMIT --stat | grep -o "lab[0-9]" | uniq`
+
+if [ "$LABS" = "" ]; then
+    echo "No solutions provided. Skip this time."
+    exit 0
+fi
+
+failed=0
+
+pwd=`pwd`
+summary=$pwd/.score_summary
+
+echo -n > $summary
+for lab in $LABS; do
+    pushd $lab > /dev/null
+    if ! make grade > .score 2>&1; then
+        failed=`echo $lab | grep -o [0-9]`
+    fi
+    score=`egrep -o "Score: [0-9]+/[0-9]+" .score`
+    echo "$lab $score" >> $summary
+    make clean > /dev/null
+    popd > /dev/null
+done
+
+echo "Labs with changes detected: " $LABS
+echo
+echo "============================== Summary =============================="
+cat $summary
+rm $summary
+echo
+
+for lab in $LABS; do
+    echo "================================ $lab ==============================="
+    cat $lab/.score
+    rm $lab/.score
+done
+
+exit $failed
diff --git a/code/lab1/tools/function.mk b/code/lab1/tools/function.mk
index 58a27e4..9b8be0c 100644
--- a/code/lab1/tools/function.mk
+++ b/code/lab1/tools/function.mk
@@ -70,7 +70,7 @@ endef
 # finish all
 define do_finish_all
 ALLDEPS = $$(ALLOBJS:.o=.d)
-$$(sort $$(dir $$(ALLOBJS)) $(BINDIR) $(OBJDIR)):
+$$(sort $$(dir $$(ALLOBJS)) $(BINDIR)$(SLASH) $(OBJDIR)$(SLASH)):
 	@$(MKDIR) $$@
 endef
 
diff --git a/code/lab4/kern/mm/kmalloc.c b/code/lab4/kern/mm/kmalloc.c
index 6565626..ed3e29a 100644
--- a/code/lab4/kern/mm/kmalloc.c
+++ b/code/lab4/kern/mm/kmalloc.c
@@ -186,14 +186,9 @@ static void slob_free(void *block, int size)
 
 
 
-void check_slob(void) {
-  cprintf("check_slob() success\n");
-}
-
 void
 slob_init(void) {
   cprintf("use SLOB allocator\n");
-  check_slob();
 }
 
 inline void 
diff --git a/code/lab4/tools/grade.sh b/code/lab4/tools/grade.sh
index ea11411..8d2b2bd 100644
--- a/code/lab4/tools/grade.sh
+++ b/code/lab4/tools/grade.sh
@@ -332,10 +332,6 @@ quick_check 'check page table'                                  \
     '  |-- PTE(000e0) faf00000-fafe0000 000e0000 urw'           \
     '  |-- PTE(00001) fafeb000-fafec000 00001000 -rw'
 
-pts=10
-quick_check 'check slob'                                        \
-    'check_slob() succeeded!'
-
 pts=25
 quick_check 'check vmm'                                         \
     'check_vma_struct() succeeded!'                             \
diff --git a/code/lab5/kern/mm/kmalloc.c b/code/lab5/kern/mm/kmalloc.c
index 6565626..ed3e29a 100644
--- a/code/lab5/kern/mm/kmalloc.c
+++ b/code/lab5/kern/mm/kmalloc.c
@@ -186,14 +186,9 @@ static void slob_free(void *block, int size)
 
 
 
-void check_slob(void) {
-  cprintf("check_slob() success\n");
-}
-
 void
 slob_init(void) {
   cprintf("use SLOB allocator\n");
-  check_slob();
 }
 
 inline void 
diff --git a/code/lab5/tools/grade.sh b/code/lab5/tools/grade.sh
index 44761e0..29db669 100644
--- a/code/lab5/tools/grade.sh
+++ b/code/lab5/tools/grade.sh
@@ -338,7 +338,6 @@ default_check() {
     'PDE(001) fac00000-fb000000 00400000 -rw'                   \
     '  |-- PTE(000e0) faf00000-fafe0000 000e0000 urw'           \
     '  |-- PTE(00001) fafeb000-fafec000 00001000 -rw'		\
-    'check_slob() succeeded!'					\
     'check_vma_struct() succeeded!'                             \
     'page fault at 0x00000100: K/W [no page found].'            \
     'check_pgfault() succeeded!'                                \
diff --git a/code/lab6/kern/mm/kmalloc.c b/code/lab6/kern/mm/kmalloc.c
index 6565626..ed3e29a 100644
--- a/code/lab6/kern/mm/kmalloc.c
+++ b/code/lab6/kern/mm/kmalloc.c
@@ -186,14 +186,9 @@ static void slob_free(void *block, int size)
 
 
 
-void check_slob(void) {
-  cprintf("check_slob() success\n");
-}
-
 void
 slob_init(void) {
   cprintf("use SLOB allocator\n");
-  check_slob();
 }
 
 inline void 
diff --git a/code/lab6/tools/grade.sh b/code/lab6/tools/grade.sh
index abe0b09..a3a52d0 100644
--- a/code/lab6/tools/grade.sh
+++ b/code/lab6/tools/grade.sh
@@ -338,7 +338,6 @@ default_check() {
     'PDE(001) fac00000-fb000000 00400000 -rw'                   \
     '  |-- PTE(000e0) faf00000-fafe0000 000e0000 urw'           \
     '  |-- PTE(00001) fafeb000-fafec000 00001000 -rw'		\
-    'check_slob() succeeded!'					\
     'check_vma_struct() succeeded!'                             \
     'page fault at 0x00000100: K/W [no page found].'            \
     'check_pgfault() succeeded!'                                \
diff --git a/code/lab7/kern/mm/kmalloc.c b/code/lab7/kern/mm/kmalloc.c
index 6565626..ed3e29a 100644
--- a/code/lab7/kern/mm/kmalloc.c
+++ b/code/lab7/kern/mm/kmalloc.c
@@ -186,14 +186,9 @@ static void slob_free(void *block, int size)
 
 
 
-void check_slob(void) {
-  cprintf("check_slob() success\n");
-}
-
 void
 slob_init(void) {
   cprintf("use SLOB allocator\n");
-  check_slob();
 }
 
 inline void 
diff --git a/code/lab7/tools/grade.sh b/code/lab7/tools/grade.sh
index b9bc485..e8c68bd 100644
--- a/code/lab7/tools/grade.sh
+++ b/code/lab7/tools/grade.sh
@@ -338,7 +338,6 @@ default_check() {
     'PDE(001) fac00000-fb000000 00400000 -rw'                   \
     '  |-- PTE(000e0) faf00000-fafe0000 000e0000 urw'           \
     '  |-- PTE(00001) fafeb000-fafec000 00001000 -rw'		\
-    'check_slob() succeeded!'					\
     'check_vma_struct() succeeded!'                             \
     'page fault at 0x00000100: K/W [no page found].'            \
     'check_pgfault() succeeded!'                                \
diff --git a/code/lab8/kern/fs/devs/dev.c b/code/lab8/kern/fs/devs/dev.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/devs/dev.h b/code/lab8/kern/fs/devs/dev.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/devs/dev_disk0.c b/code/lab8/kern/fs/devs/dev_disk0.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/devs/dev_stdin.c b/code/lab8/kern/fs/devs/dev_stdin.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/devs/dev_stdout.c b/code/lab8/kern/fs/devs/dev_stdout.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/file.c b/code/lab8/kern/fs/file.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/file.h b/code/lab8/kern/fs/file.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/fs.c b/code/lab8/kern/fs/fs.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/fs.h b/code/lab8/kern/fs/fs.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/iobuf.c b/code/lab8/kern/fs/iobuf.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/iobuf.h b/code/lab8/kern/fs/iobuf.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/bitmap.c b/code/lab8/kern/fs/sfs/bitmap.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/bitmap.h b/code/lab8/kern/fs/sfs/bitmap.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/sfs.c b/code/lab8/kern/fs/sfs/sfs.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/sfs.h b/code/lab8/kern/fs/sfs/sfs.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/sfs_fs.c b/code/lab8/kern/fs/sfs/sfs_fs.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/sfs_inode.c b/code/lab8/kern/fs/sfs/sfs_inode.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/sfs_io.c b/code/lab8/kern/fs/sfs/sfs_io.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sfs/sfs_lock.c b/code/lab8/kern/fs/sfs/sfs_lock.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/swap/swapfs.c b/code/lab8/kern/fs/swap/swapfs.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/swap/swapfs.h b/code/lab8/kern/fs/swap/swapfs.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sysfile.c b/code/lab8/kern/fs/sysfile.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/sysfile.h b/code/lab8/kern/fs/sysfile.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/inode.c b/code/lab8/kern/fs/vfs/inode.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/inode.h b/code/lab8/kern/fs/vfs/inode.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/vfs.c b/code/lab8/kern/fs/vfs/vfs.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/vfs.h b/code/lab8/kern/fs/vfs/vfs.h
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/vfsdev.c b/code/lab8/kern/fs/vfs/vfsdev.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/vfsfile.c b/code/lab8/kern/fs/vfs/vfsfile.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/vfslookup.c b/code/lab8/kern/fs/vfs/vfslookup.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/fs/vfs/vfspath.c b/code/lab8/kern/fs/vfs/vfspath.c
old mode 100755
new mode 100644
diff --git a/code/lab8/kern/mm/kmalloc.c b/code/lab8/kern/mm/kmalloc.c
index 6565626..ed3e29a 100644
--- a/code/lab8/kern/mm/kmalloc.c
+++ b/code/lab8/kern/mm/kmalloc.c
@@ -186,14 +186,9 @@ static void slob_free(void *block, int size)
 
 
 
-void check_slob(void) {
-  cprintf("check_slob() success\n");
-}
-
 void
 slob_init(void) {
   cprintf("use SLOB allocator\n");
-  check_slob();
 }
 
 inline void 
diff --git a/code/lab8/libs/dirent.h b/code/lab8/libs/dirent.h
old mode 100755
new mode 100644
diff --git a/code/lab8/tools/grade.sh b/code/lab8/tools/grade.sh
index b9bc485..920a344 100644
--- a/code/lab8/tools/grade.sh
+++ b/code/lab8/tools/grade.sh
@@ -314,11 +314,14 @@ quick_check() {
 ## kernel image
 osimg=$(make_print ucoreimg)
 
+## sfs image
+sfsimg=$(make_print sfsimg)
+
 ## swap image
 swapimg=$(make_print swapimg)
 
 ## set default qemu-options
-qemuopts="-hda $osimg -drive file=$swapimg,media=disk,cache=writeback"
+qemuopts="-hda $osimg -drive file=$swapimg,media=disk,cache=writeback -drive file=$sfsimg,media=disk,cache=writeback"
 
 ## set break-function, default is readline
 brkfun=readline
diff --git a/code/lab8/user/ls.c b/code/lab8/user/ls.c
old mode 100755
new mode 100644
diff --git a/code/lab8/user/sh.c b/code/lab8/user/sh.c
old mode 100755
new mode 100644