linux/drivers/xen
Vladimir Davydov 53d85c9856 cleancache: forbid overriding cleancache_ops
Currently, cleancache_register_ops returns the previous value of
cleancache_ops to allow chaining.  However, chaining, as it is
implemented now, is extremely dangerous due to possible pool id
collisions.  Suppose, a new cleancache driver is registered after the
previous one assigned an id to a super block.  If the new driver assigns
the same id to another super block, which is perfectly possible, we will
have two different filesystems using the same id.  No matter if the new
driver implements chaining or not, we are likely to get data corruption
with such a configuration eventually.

This patch therefore disables the ability to override cleancache_ops
altogether as potentially dangerous.  If there is already cleancache
driver registered, all further calls to cleancache_register_ops will
return EBUSY.  Since no user of cleancache implements chaining, we only
need to make minor changes to the code outside the cleancache core.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Stefan Hengelein <ilendir@googlemail.com>
Cc: Florian Schmaus <fschmaus@gmail.com>
Cc: Andor Daam <andor.daam@googlemail.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-14 16:49:03 -07:00
..
events xen/events: avoid NULL pointer dereference in dom0 on large machines 2015-03-06 13:16:32 +00:00
xen-pciback xen-pciback: limit guest control of command register 2015-03-11 14:34:40 +00:00
xenbus xenbus: Add proper handling of XS_ERROR from Xenbus for transactions. 2015-02-05 15:04:46 +00:00
xenfs xen: Convert printks to pr_<level> 2013-06-28 11:19:58 -04:00
Kconfig x86/xen: prepare p2m list for memory hotplug 2015-03-23 15:14:47 +00:00
Makefile x86/xen: allow privcmd hypercalls to be preempted 2015-02-23 16:30:24 +00:00
acpi.c xen / ACPI: notify xen when reduced hardware sleep is available 2013-07-31 14:22:35 +02:00
balloon.c xen/balloon: before adding hotplugged memory, set frames to invalid 2015-03-23 15:15:53 +00:00
biomerge.c xen: using EXPORT_SYMBOL requires including export.h 2012-01-18 15:37:49 -08:00
cpu_hotplug.c xen: Convert printks to pr_<level> 2013-06-28 11:19:58 -04:00
dbgp.c xen: Use dev_is_pci() to check whether it is pci device 2014-01-07 09:53:33 -05:00
efi.c efi: dmi: add support for SMBIOS 3.0 UEFI configuration table 2014-11-05 09:03:16 +01:00
evtchn.c xen/evtchn: support more than 4096 ports 2014-01-06 10:07:50 -05:00
fallback.c xen-pciback: notify hypervisor about devices intended to be assigned to guests 2013-03-22 10:20:55 -04:00
features.c
gntalloc.c xen/gntalloc: safely delete grefs in add_grefs() undo path 2014-09-04 13:14:05 +01:00
gntdev.c xen/gntdev: provide find_special_page VMA operation 2015-01-28 14:04:58 +00:00
grant-table.c xen/grant-table: add a mechanism to safely unmap pages that are in use 2015-01-28 14:03:14 +00:00
manage.c xen/manage: Fix USB interaction issues when resuming 2015-02-06 15:49:09 +00:00
mcelog.c xen: Convert printks to pr_<level> 2013-06-28 11:19:58 -04:00
pci.c xen/pci: Allocate memory for physdev_pci_device_add's optarr 2014-10-23 16:24:02 +01:00
pcpu.c drivers: xen: Include appropriate header file in pcpu.c 2014-02-28 15:26:08 -05:00
platform-pci.c drivers: xen: Mark function as static in platform-pci.c 2014-02-28 15:26:04 -05:00
preempt.c x86/xen: allow privcmd hypercalls to be preempted 2015-02-23 16:30:24 +00:00
privcmd.c x86/xen: allow privcmd hypercalls to be preempted 2015-02-23 16:30:24 +00:00
privcmd.h xen: Add privcmd device driver 2011-12-16 13:29:31 -05:00
swiotlb-xen.c Revert "swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single" 2014-12-10 14:58:35 +00:00
sys-hypervisor.c xen: sysfs: fix build warning. 2012-10-19 15:17:51 -04:00
tmem.c cleancache: forbid overriding cleancache_ops 2015-04-14 16:49:03 -07:00
xen-acpi-cpuhotplug.c ACPI: Drop acpi_evaluate_hotplug_ost() and ACPI_HOTPLUG_OST 2014-02-22 00:50:49 +01:00
xen-acpi-memhotplug.c ACPICA: Resources: Provide common part for struct acpi_resource_address structures. 2015-01-26 16:09:56 +01:00
xen-acpi-pad.c ACPI / PAD / xen: use acpi_evaluate_ost() to replace open-coded version 2014-02-21 00:27:47 +01:00
xen-acpi-processor.c xen-acpi-processor: Don't display errors when we get -ENOSYS 2014-05-23 12:34:00 -04:00
xen-balloon.c xen: Convert printks to pr_<level> 2013-06-28 11:19:58 -04:00
xen-scsiback.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
xen-selfballoon.c drivers:xen-selfballoon:reset 'frontswap_inertia_counter' after frontswap_shrink 2014-02-28 15:26:12 -05:00
xen-stub.c xen/acpi: remove redundant acpi/acpi_drivers.h include 2013-03-11 13:53:02 -04:00