linux-stable.git/include/linux/dm-ioctl.h, branch linux-2.6.37.y

dm: allow autoloading of dm mod

2010-08-12T03:14:05+00:00

Add devname:mapper/control and MAPPER_CTRL_MINOR module alias
to support dm-mod module autoloading.

Signed-off-by: Kay Sievers 
Signed-off-by: Peter Rajnoha 
Signed-off-by: Alasdair G Kergon

dm ioctl: make bio or request based device type immutable

2010-08-12T03:14:01+00:00

Determine whether a mapped device is bio-based or request-based when
loading its first (inactive) table and don't allow that to be changed
later.

This patch performs different device initialisation in each of the two
cases.  (We don't think it's necessary to add code to support changing
between the two types.)

Allowed md->type transitions:
  DM_TYPE_NONE to DM_TYPE_BIO_BASED
  DM_TYPE_NONE to DM_TYPE_REQUEST_BASED

We now prevent table_load from replacing the inactive table with a
conflicting type of table even after an explicit table_clear.

Introduce 'type_lock' into the struct mapped_device to protect md->type
and to prepare for the next patch that will change the queue
initialization and allocate memory while md->type_lock is held.

Signed-off-by: Mike Snitzer 
Acked-by: Kiyoshi Ueda 
Signed-off-by: Alasdair G Kergon 

 drivers/md/dm-ioctl.c    |   15 +++++++++++++++
 drivers/md/dm.c          |   37 ++++++++++++++++++++++++++++++-------
 drivers/md/dm.h          |    5 +++++
 include/linux/dm-ioctl.h |    4 ++--
 4 files changed, 52 insertions(+), 9 deletions(-)

dm ioctl: introduce flag indicating uevent was generated

2010-03-06T02:32:31+00:00

Set a new DM_UEVENT_GENERATED_FLAG when returning from ioctls to
indicate that a uevent was actually generated.  This tells the userspace
caller that it may need to wait for the event to be processed.

Signed-off-by: Peter Rajnoha 
Signed-off-by: Alasdair G Kergon

dm ioctl: retrieve status from inactive table

2009-12-10T23:52:22+00:00

Add the flag DM_QUERY_INACTIVE_TABLE_FLAG to the ioctls to return
infomation about the loaded-but-not-yet-active table instead of the live
table.  Prior to this patch it was impossible to obtain this information
until the device had been 'resumed'.

Userspace dmsetup and libdevmapper support the flag as of version 1.02.40.
e.g. dmsetup info --inactive vg1-lv1

Signed-off-by: Mike Snitzer 
Signed-off-by: Alasdair G Kergon

dm ioctl: support cookies for udev

2009-06-22T09:12:30+00:00

Add support for passing a 32 bit "cookie" into the kernel with the
DM_SUSPEND, DM_DEV_RENAME and DM_DEV_REMOVE ioctls.  The (unsigned)
value of this cookie is returned to userspace alongside the uevents
issued by these ioctls in the variable DM_COOKIE.

This means the userspace process issuing these ioctls can be notified
by udev after udev has completed any actions triggered.

To minimise the interface extension, we pass the cookie into the
kernel in the event_nr field which is otherwise unused when calling
these ioctls.  Incrementing the version number allows userspace to
determine in advance whether or not the kernel supports the cookie.
If the kernel does support this but userspace does not, there should
be no impact as the new variable will just get ignored.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

make most exported headers use strict integer types

2009-03-26T17:14:15+00:00

This takes care of all files that have only a small number
of non-strict integer type uses.

Signed-off-by: Arnd Bergmann 
Cc: Mauro Carvalho Chehab 
Cc: David Airlie 
Cc: Arnaldo Carvalho de Melo 
Cc: YOSHIFUJI Hideaki 
Cc: netdev@vger.kernel.org
Cc: linux-ppp@vger.kernel.org
Cc: Jaroslav Kysela 
Cc: Takashi Iwai 
Cc: David Woodhouse 
Signed-off-by: H. Peter Anvin 
Signed-off-by: Ingo Molnar

dm: introduce merge_bvec_fn

2008-07-21T11:00:37+00:00

Introduce a bvec merge function for device mapper devices
for dynamic size restrictions.

This code ensures the requested biovec lies within a single
target and then calls a target-specific function to check
against any constraints imposed by underlying devices.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm ioctl: move compat code

2008-02-08T02:09:56+00:00

Move compat_ioctl handling into dm-ioctl.c.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm io:ctl use constant struct size

2007-10-20T01:00:58+00:00

Make size of dm_ioctl struct always 312 bytes on all supported
architectures.

This change retains compatibility with already-compiled code because
it uses an embedded offset to locate the payload that follows the
structure.

On 64-bit architectures there is no change at all; on 32-bit
we are increasing the size of dm-ioctl from 308 to 312 bytes.

Currently with 32-bit userspace / 64-bit kernel on x86_64
some ioctls (including rename, message) are incorrectly rejected
by the comparison against 'param + 1'.  This breaks userspace
lvrename and multipath 'fail_if_no_path' changes, for example.

(BTW Device-mapper uses its own versioning and ignores the ioctl
size bits.  Only the generic ioctl compat code on mixed arches
checks them, and that will continue to accept both sizes for now,
but we intend to list 308 as deprecated and eventually remove it.)

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon 
Cc: Guido Guenther 
Cc: Kevin Corry 
Cc: stable@kernel.org

[PATCH] dm: ioctl: add noflush suspend

2006-12-08T16:29:09+00:00

Provide a dm ioctl option to request noflush suspending.  (See next patch for
what this is for.) As the interface is extended, the version number is
incremented.

Other than accepting the new option through the interface, There is no change
to existing behaviour.

Test results:
Confirmed the option is given from user-space correctly.

Signed-off-by: Kiyoshi Ueda 
Signed-off-by: Jun'ichi Nomura 
Signed-off-by: Alasdair G Kergon 
Cc: dm-devel@redhat.com
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds