Andrew Morton wrote:
On Mon, 19 Nov 2007 05:44:01 -0800 (PST)
bugme-daemon@xxxxxxxxxxxxxxxxxxx wrote:
http://bugzilla.kernel.org/show_bug.cgi?id=9405
Summary: iSCSI does not implement ordering guarantees required by
e.g. journaling filesystems
Product: IO/Storage
Version: 2.5
KernelVersion: 2.6.23.1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: SCSI
AssignedTo: io_scsi@xxxxxxxxxxxxxxxxxxxx
ReportedBy: bart.vanassche@xxxxxxxxx
Most recent kernel where this bug did not occur: (new issue)
Distribution: any
Hardware Environment: (does not apply)
Software Environment: (does not apply)
Problem Description: The sd (SCSI disk) driver ignores block device barriers
(REQ_HARDBARRIER). The iSCSI code in the kernel sends all iSCSI commands with
flag ISCSI_ATTR_SIMPLE to the iSCSI target. This means that the target may
reorder these commands. Since a.o. correct operation of journaling filesystems
depends on being able to enforce the order of certain block write operations,
not enforcing write ordering is a bug. This can be solved by either adding
support for REQ_HARDBARRIER in the sd device or by replacing ISCSI_ATTR_SIMPLE
by ISCSI_ATTR_ORDERED.
Steps to reproduce: Source reading of drivers/scsi/sd.c and
drivers/scsi/libiscsi.c.
References: SCSI Architecture Model - 3, paragraph 8.6
(http://www.t10.org/ftp/t10/drafts/sam3/sam3r14.pdf).
(does iscsi have a maintainer?)
Attached is a patch to add me to the maintainers file so it will be
easier to hunt me down in the future. It was made over 2.6.24-rc2.
Add Mike Christie to MAINTAINERS file.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1c7c229..82b5751 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2111,6 +2111,14 @@ L: irda-users@xxxxxxxxxxxxxxxxxxxxx (subscribers-only)
W: http://irda.sourceforge.net/
S: Maintained
+iSCSI
+P: Mike Christie
+M: michaelc@xxxxxxxxxxx
+L: open-iscsi@xxxxxxxxxxxxxxxx
+W: www.open-iscsi.org
+T: git kernel.org:/pub/scm/linux/kernel/mnc/linux-2.6-iscsi.git
+S: Maintained
+
ISAPNP
P: Jaroslav Kysela
M: perex@xxxxxxxx
