[PATCH] tests: use scsi_debug to test-for 4k-sector-specific bug

[Jim Meyering]

* tests/t9010-big-sector.sh: New root-only test.
Requires 2.6.31, and the scsi_debug module, /sys/block/... support
and an upcoming version of libblkid.
* tests/Makefile.am (TESTS): Add t9010-big-sector.sh.
Thanks to Mike Snitzer for advice and for pointing me to similar
code he wrote to test LVM.
---
 tests/Makefile.am         |    3 +-
 tests/t9010-big-sector.sh |   96 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+), 1 deletions(-)
 create mode 100755 tests/t9010-big-sector.sh

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9bf1b1d..42badff 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -27,7 +27,8 @@ TESTS = \
   t5000-tags.sh \
   t6000-dm.sh \
   t7000-scripting.sh \
-  t8000-loop.sh
+  t8000-loop.sh \
+  t9010-big-sector.sh

 EXTRA_DIST = \
   $(TESTS) test-lib.sh t-lib.sh lvm-utils.sh
diff --git a/tests/t9010-big-sector.sh b/tests/t9010-big-sector.sh
new file mode 100755
index 0000000..b0d48cb
--- /dev/null
+++ b/tests/t9010-big-sector.sh
@@ -0,0 +1,96 @@
+#!/bin/sh
+# check physical sector size as reported by 'print'
+
+# Copyright (C) 2009 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  parted --version
+fi
+
+: ${srcdir=.}
+. $srcdir/t-lib.sh
+
+require_root_
+
+dev=
+cleanup_() {
+  # Remove the module only if this script added it.
+  test -z "$dev" && return
+
+  # We have to insist.  Otherwise, a single rmmod usually fails to remove it.
+  for i in 1 2 3; do rmmod scsi_debug && break; sleep .2 || sleep 1; done
+}
+
+wait_for_dev_to_appear_()
+{
+  local file=$1
+  local i=0
+  local incr=1
+  while :; do
+    ls "$file" > /dev/null 2>&1 && return 0
+    sleep .1 2>/dev/null || { sleep 1; incr=10; }
+    i=$(expr $i + $incr); test $i = 20 && break
+  done
+  return 1
+}
+
+print_sd_names_() { (cd /sys/block && printf '%s\n' sd*); }
+
+scsi_debug_setup_()
+{
+  local new_dev
+  print_sd_names_ > before
+  modprobe scsi_debug dev_size_mb=513 sector_size=4096
+  local incr=1
+  i=0
+  while print_sd_names_ | cmp -s - before; do
+    sleep .1 2>/dev/null || { sleep 1; incr=10; }
+    i=$(expr $i + $incr); test $i = 20 && break
+  done
+  print_sd_names_ > after
+  new_dev=$(comm -3 before after | tr -d '\011\012')
+  rm -f before after
+  test -z "$new_dev" && return 1
+  local t=/dev/$new_dev
+  wait_for_dev_to_appear_ $t
+  echo $t
+  return 0
+}
+
+# check for scsi_debug module
+modprobe -n scsi_debug ||
+  skip_test_ "you lack the scsi_debug kernel module"
+
+grep '^#define USE_BLKID 1' "$CONFIG_HEADER" > /dev/null ||
+  skip_test_ 'this system lacks a new-enough libblkid'
+
+echo 'Sector size (logical/physical): 4096B/4096B' > exp || framework_failure
+
+# create memory-backed device
+dev=$(scsi_debug_setup_) ||
+  skip_test_ 'failed to create scsi_debug device'
+
+fail=0
+
+# create partition table and print
+parted -s $dev mklabel gpt print > out 2>&1 || fail=1
+grep '^Sector' out > k 2>&1 || fail=1
+mv k out || fail=1
+
+compare out exp || fail=1
+
+Exit $fail
--
1.6.5.1.258.g5b20