提交 · 9faf400f7e51e56ec76b2fc481c3191c01cb3a57 · openanolis / cloud-kernel

03 10月, 2006 5 次提交

[PATCH] dm: use private biosets · 9faf400f

由 Stefan Bader 提交于 10月 03, 2006

I found a problem within device-mapper that occurs in low-mem situations. It
was found using a mirror target but I think in theory it would hit any setup
that stacks device-mapper devices (like LVM on top of multipath).

Since device-mapper core uses the common fs_bioset in clone_bio(), and a
private, but still global, bio_set in split_bvec() it is possible that the
filesystem and the first level target successfully get bios but the lower
level target doesn't because there is no more memory and the pool was drained
by upper layers. So the remapping will be stuck forever. To solve this
device-mapper core needs to use a private bio_set for each device.
Signed-off-by: NStefan Bader <Stefan.Bader@de.ibm.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

9faf400f

[PATCH] dm table: add target preresume · 8757b776

由 Milan Broz 提交于 10月 03, 2006

This patch adds a target preresume hook.

It is called before the targets are resumed and if it returns an error the
resume gets cancelled.

The crypt target will use this to indicate that it is unable to process I/O
because no encryption key has been supplied.
Signed-off-by: NMilan Broz <mbroz@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

8757b776

[PATCH] dm: add uevent change event on resume · 8560ed6f

由 Hannes Reinecke 提交于 10月 03, 2006

Device-mapper devices are not accessible until a 'resume' ioctl has been
issued.  For userspace to find out when this happens we need to generate an
uevent for udev to take appropriate action.

As discussed at OLS we should send 'change' events for 'resume'.  We can think
of no useful purpose served by also having 'suspend' events.
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

8560ed6f

[PATCH] dm: fix alloc_dev error path · e3f6ac61

由 Ishai Rabinovitz 提交于 10月 03, 2006

While reading the code I found a bug in the error path in alloc_dev in dm.c

When blk_alloc_queue fails there is no call to free_minor.

This patch fixes the problem.
Signed-off-by: NIshai Rabinovitz <ishai@mellanox.co.il>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

e3f6ac61

[PATCH] dm: support ioctls on mapped devices · aa129a22

由 Milan Broz 提交于 10月 03, 2006

Extend the core device-mapper infrastructure to accept arbitrary ioctls on a
mapped device provided that it has exactly one target and it is capable of
supporting ioctls.

[We can't use unlocked_ioctl because we need 'inode': 'file' might be NULL.
Is it worth changing this?]
Signed-off-by: NMilan Broz <mbroz@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

Arnd Bergmann <arnd@arndb.de> wrote:

> Am Wednesday 21 June 2006 21:31 schrieb Alasdair G Kergon:
> > static struct block_device_operations dm_blk_dops = {
> > .open = dm_blk_open,
> > .release = dm_blk_close,
> > +.ioctl = dm_blk_ioctl,
> > .getgeo = dm_blk_getgeo,
> > .owner = THIS_MODULE
>
> I guess this also needs a ->compat_ioctl method, otherwise it won't
> work for ioctl numbers that have a compat_ioctl implementation in the
> low-level device driver.
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

aa129a22

27 6月, 2006 11 次提交

[PATCH] devfs: Last little devfs cleanups throughout the kernel tree. · 890fbae2

由 Greg Kroah-Hartman 提交于 6月 20, 2005

Just removes a few unused #defines and fixes some comments due to
devfs now being gone.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

890fbae2

[PATCH] dm: improve error message consistency · 72d94861

由 Alasdair G Kergon 提交于 6月 26, 2006

Tidy device-mapper error messages to include context information
automatically.
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

72d94861

[PATCH] dm: prevent removal if open · 5c6bd75d

由 Alasdair G Kergon 提交于 6月 26, 2006

If you misuse the device-mapper interface (or there's a bug in your userspace
tools) it's possible to end up with 'unlinked' mapped devices that cannot be
removed until you reboot (along with uninterruptible processes).

This patch prevents you from removing a device that is still open.

It introduces dm_lock_for_deletion() which is called when a device is about to
be removed to ensure that nothing has it open and nothing further can open it.
It uses a private open_count for this which also lets us remove one of the
problematic bdget_disk() calls elsewhere.
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

5c6bd75d

[PATCH] dm: add exports · 17b2f66f

由 Alasdair G Kergon 提交于 6月 26, 2006

Move definitions of core device-mapper functions for manipulating mapped
devices and their tables to <linux/device-mapper.h> advertising their
availability for use elsewhere in the kernel.

Protect the contents of device-mapper.h with ifdef __KERNEL__.  And throw
in a few formatting clean-ups and extra comments.
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

17b2f66f

[PATCH] dm: consolidate creation functions · 2b06cfff

由 Alasdair G Kergon 提交于 6月 26, 2006

Merge dm_create() and dm_create_with_minor() by introducing the special value
DM_ANY_MINOR to request the allocation of the next available minor number.
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

2b06cfff

[PATCH] dm: fix block device initialisation · f0b04115