tests: add test for resize2fs -M with inode table in middle of block group

Eric Sandeen reported that Fedora's mke2fs when compiled for ppc was
creating a file system which caused problems with resize2fs -M.
Closer examination showed that the problem was file system which
looked like this:

Filesystem features:      ext_attr dir_index filetype sparse_super
Inode count:              512
Block count:              1247
   ...

Group 0: (Blocks 1-1024)
  Primary superblock at 1, Group descriptors at 2-2
  Block bitmap at 66 (+65), Inode bitmap at 67 (+66)
  Inode table at 68-99 (+67)

Group 1: (Blocks 1025-1246)
  Backup superblock at 1025, Group descriptors at 1026-1026
  Block bitmap at 1090 (+65), Inode bitmap at 1091 (+66)
  Inode table at 1092-1123 (+67)

It's not obvious to me why Fedora's ppc mke2fs is creating file
systems like this (I can't reproduce this on debian ppc systems), but
resize2fs -M should be able to deal with such file systems, which is
what this test is designed to check.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

tests/r_min_itable/expect

@@ -0,0 +1,14 @@
+resize2fs test
+resize2fs -M test.img
+Resizing the filesystem on test.img to 1124 (1k) blocks.
+The filesystem on test.img is now 1124 blocks long.
+
+Exit status is 0
+e2fsck 1.42.8 (20-Jun-2013)
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+test_filesys: 13/512 files (0.0% non-contiguous), 1120/1124 blocks
+Exit status is 0

tests/r_min_itable/name

@@ -0,0 +1 @@
+resize2fs -M with inode table in middle of last block group

tests/r_min_itable/script

@@ -0,0 +1,43 @@
+if test -x $RESIZE2FS_EXE -a -x $DEBUGFS_EXE; then
+
+IMAGE=$test_dir/image.gz
+FSCK_OPT=-yf
+OUT=$test_name.log
+EXP=$test_dir/expect
+
+gunzip < $IMAGE > $TMPFILE
+
+echo "resize2fs test" > $OUT
+
+echo "resize2fs -M test.img" >> $OUT
+$RESIZE2FS -M $TMPFILE 2>&1 >> $OUT.new 2>&1
+status=$?
+echo Exit status is $status >> $OUT.new
+sed -f $cmd_dir/filter.sed -e "s;$TMPFILE;test.img;" $OUT.new >> $OUT
+
+$FSCK $FSCK_OPT -N test_filesys $TMPFILE >> $OUT 2>&1 
+echo Exit status is $status >> $OUT
+
+rm $TMPFILE $OUT.new
+
+#
+# Do the verification
+#
+
+cmp -s $OUT $EXP
+status=$?
+
+if [ "$status" = 0 ] ; then
+	echo "$test_name: $test_description: ok"
+	touch $test_name.ok
+else
+	echo "$test_name: $test_description: failed"
+	diff $DIFF_OPTS $EXP $OUT > $test_name.failed
+fi
+
+unset IMAGE FSCK_OPT OUT EXP
+
+else #if test -x $RESIZE2FS_EXE -a -x $DEBUGFS_EXE; then
+	echo "$test_name: $test_description: skipped"
+fi
+