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  1. 15 12月, 2011 8 次提交
  3. 14 12月, 2011 6 次提交
  5. 12 12月, 2011 15 次提交
  7. 09 12月, 2011 5 次提交
  9. 08 12月, 2011 6 次提交
    • N
      md/raid5: never wait for bad-block acks on failed device. · 9283d8c5
      由 NeilBrown 提交于 
      Once a device is failed we really want to completely ignore it.
It should go away soon anyway.

In particular the presence of bad blocks on it should not cause us to
block as we won't be trying to write there anyway.

So as soon as we can check if a device is Faulty, do so and pretend
that it is already gone if it is Faulty.
Signed-off-by: NNeilBrown <neilb@suse.de>
      9283d8c5
    • N
      md: ensure new badblocks are handled promptly. · 8bd2f0a0
      由 NeilBrown 提交于 
      When we mark blocks as bad we need them to be acknowledged by the
metadata handler promptly.

For an in-kernel metadata handler that was already being done.  But
for an external metadata handler we need to alert it of the change by
sending a notification through the sysfs file.  This adds that
notification.
Signed-off-by: NNeilBrown <neilb@suse.de>
      8bd2f0a0
    • N
      md: bad blocks shouldn't cause a Blocked status on a Faulty device. · 52c64152
      由 NeilBrown 提交于 
      Once a device is marked Faulty the badblocks - whether acknowledged or
not - become irrelevant.  So they shouldn't cause the device to be
marked as Blocked.

Without this patch, a process might write "-blocked" to clear the
Blocked status, but while that will correctly fail the device, it
won't remove the apparent 'blocked' status.
Signed-off-by: NNeilBrown <neilb@suse.de>
      52c64152
    • N
      md: take a reference to mddev during sysfs access. · af8a2434
      由 NeilBrown 提交于 
      
When we are accessing an mddev via sysfs we know that the
mddev cannot disappear because it has an embedded kobj which
is refcounted by sysfs.
And we also take the mddev_lock.
However this is not enough.

The final mddev_put could have been called and the
mddev_delayed_delete is waiting for sysfs to let go so it can destroy
the kobj and mddev.
In this state there are a lot of changes that should not be attempted.

To to guard against this we:
 - initialise mddev->all_mddevs in on last put so the state can be
   easily detected.
 - in md_attr_show and md_attr_store, check ->all_mddevs under
   all_mddevs_lock and mddev_get the mddev if it still appears to
   be active.

This means that if we get to sysfs as the mddev is being deleted we
will get -EBUSY.

rdev_attr_store and rdev_attr_show are similar but already have
sufficient protection.  They check that rdev->mddev still points to
mddev after taking mddev_lock.  As this is cleared  before delayed
removal which can only be requested under the mddev_lock, this
ensure the rdev and mddev are still alive.
Signed-off-by: NNeilBrown <neilb@suse.de>
      af8a2434
    • N
      md: refine interpretation of "hold_active == UNTIL_IOCTL". · 1d23f178
      由 NeilBrown 提交于 
      We like md devices to disappear when they really are not needed.
However it is not possible to tell from the current state whether it
is needed or not.  We can only tell from recent history of changes.

In particular immediately after we create an md device it looks very
similar to immediately after we have finished with it.

So we always preserve a newly created md device until something
significant happens.  This state is stored in 'hold_active'.

The normal case is to keep it until an ioctl happens, as that will
normally either activate it, or explicitly de-activate it.  If it
doesn't then it was probably created by mistake and it is now time to
get rid of it.

We can also modify an array via sysfs (instead of via ioctl) and we
currently treat any change via sysfs like an ioctl as a sign that if
it now isn't more active, it should be destroyed.
However this is not appropriate as changes made via sysfs are more
gradual so we should look for a more definitive change.

So this patch only clears 'hold_active' from UNTIL_IOCTL to clear when
the array_state is changed via sysfs.  Other changes via sysfs
are ignored.
Signed-off-by: NNeilBrown <neilb@suse.de>
      1d23f178
    • A
      PM / Driver core: leave runtime PM enabled during system shutdown · fe6b91f4
      由 Alan Stern 提交于 
      Disabling all runtime PM during system shutdown turns out not to be a
good idea, because some devices may need to be woken up from a
low-power state at that time.

The whole point of disabling runtime PM for system shutdown was to
prevent untimely runtime-suspend method calls.  This patch (as1504)
accomplishes the same result by incrementing the usage count for each
device and waiting for ongoing runtime-PM callbacks to finish.  This
is what we already do during system suspend and hibernation, which
makes sense since the shutdown method is pretty much a legacy analog
of the pm->poweroff method.

This fixes a recent regression on some OMAP systems introduced by
commit af8db150 (PM / driver core:
disable device's runtime PM during shutdown).
Reported-and-tested-by: NNeilBrown <neilb@suse.de>
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
      fe6b91f4