From: Anand Jain <Anand.Jain@xxxxxxxxxx>
Controlled EIO from the device is achieved using the dm device.
Helper functions are at common/dmerror.
Broadly steps will include calling _dmerror_init().
_dmerror_init() will use SCRATCH_DEV to create dm linear device and assign
DMERROR_DEV to /dev/mapper/error-test.
When test script is ready to get EIO, the test cases can call
_dmerror_load_table() which then it will load the dm error.
so that reading DMERROR_DEV will cause EIO. After the test case is
complete, cleanup must be done by calling _dmerror_cleanup().
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx>
---
v6->v7:
rename _init_dmerror() to _dmerror_init()
remove _scratch_mkfs_dmerror()
rename _mount_dmerror() to _dmerror_mount()
rename _cleaup_dmerror() to _dmerror_cleanup()
rename _load_dmerror_table() to _dmerror_load_table()
rename BLK_DEV_SIZE to blk_dev_size
remove _unmount_dmerror there were no consumer of it
use _fail instead of _fatal in rc/dmerror
update error log to make crisp sense
move _require_dmerror() from common/rc to common/dmerror and rename
it to dmerror_required() so that its consistent with other function
names with in the file
v5->v6: accepts Eryu's comments, thanks
(. added missing $MKFS_OPTIONS at _scratch_mkfs_dmerror()
. used $MOUNT_PROG instead of mount at _mount_dmerror()
. correct typo $UMOUNT_PROG, no S at the end in _unmount_dmerror()
)
v4->v5: No Change. keep up with the patch set
v3->v4: rebase on latest xfstests code
v2.1->v3: accepts Filipe Manana's review comments, thanks
(. correct if else statement in _require_dm_error()
. fix indent
a missed Dave comment in v1. looks like I goofed with git cli
)
v2->v2.1: fixed missed typo error fixup in the commit.
v1->v2: accepts Dave Chinner's review comments, thanks
(. use SCRATCH_DEV for dmerror backing device
. remove duplicate check of DM_BLK_DEV in _init_dm_error_dev()
. remove a wrong check when reading block size in _init_dm_error_dev()
. remove a wrong check with blockdev --setra in _init_dm_error_dev()
. remove unnecessary check in _load_dm_error_table()
. remove unnecessary dmerror device test by using dd
)
common/dmerror | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)
create mode 100644 common/dmerror
diff --git a/common/dmerror b/common/dmerror
new file mode 100644
index 0000000..f8b9ce6
--- /dev/null
+++ b/common/dmerror
@@ -0,0 +1,71 @@
+##/bin/bash
+#
+# Copyright (c) 2015 Oracle. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#
+#
+# common functions for setting up and tearing down a dmerror device
+
+# this test requires the device mapper error target
+#
+_dmerror_required()
+{
+ _require_command "$DMSETUP_PROG" dmsetup
+ $DMSETUP_PROG targets | grep error >/dev/null 2>&1
+ [ $? -ne 0 ] && _notrun "This test requires dm error support"
+}
+
+_dmerror_init()
+{
+ local dm_backing_dev=$SCRATCH_DEV
+
+ $DMSETUP_PROG remove error-test > /dev/null 2>&1
+
+ local blk_dev_size=`blockdev --getsz $dm_backing_dev`
+
+ DMERROR_DEV='/dev/mapper/error-test'
+
+ DMLINEAR_TABLE="0 $blk_dev_size linear $dm_backing_dev 0"
+
+ $DMSETUP_PROG create error-test --table "$DMLINEAR_TABLE" || \
+ _fatal "failed to create dm linear device"
+
+ DMERROR_TABLE="0 $blk_dev_size error $dm_backing_dev 0"
+}
+
+_dmerror_mount()
+{
+ _scratch_options mount
+ _mount -t $FSTYP $SCRATCH_OPTIONS $MOUNT_OPTIONS $SELINUX_MOUNT_OPTIONS $* \
+ $DMERROR_DEV $SCRATCH_MNT
+}
+
+_dmerror_cleanup()
+{
+ $UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
+ $DMSETUP_PROG remove error-test > /dev/null 2>&1
+}
+
+_dmerror_load_table()
+{
+ $DMSETUP_PROG suspend error-test
+ [ $? -ne 0 ] && _fail "dmsetup suspend failed"
+
+ $DMSETUP_PROG load error-test --table "$DMERROR_TABLE"
+ [ $? -ne 0 ] && _fail "dmsetup failed to load error table"
+
+ $DMSETUP_PROG resume error-test
+ [ $? -ne 0 ] && _fail "dmsetup resume failed"
+}
--
2.4.1
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