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  1. 07 10月, 2011 4 次提交
  3. 23 9月, 2011 1 次提交
    • D
      md: don't delay reboot by 1 second if no MD devices exist · 2dba6a91
      由 Daniel P. Berrange 提交于 
      The md_notify_reboot() method includes a call to mdelay(1000),
to deal with "exotic SCSI devices" which are too volatile on
reboot. The delay is unconditional. Even if the machine does
not have any block devices, let alone MD devices, the kernel
shutdown sequence is slowed down.

1 second does not matter much with physical hardware, but with
certain virtualization use cases any wasted time in the bootup
& shutdown sequence counts for alot.

* drivers/md/md.c: md_notify_reboot() - only impose a delay if
  there was at least one MD device to be stopped during reboot
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NNeilBrown <neilb@suse.de>
      2dba6a91
  5. 21 9月, 2011 4 次提交
    • W
      trival: md_k.h should be md.h in the beginning comment of file md.h · 7e841526
      由 Wang Sheng-Hui 提交于 
      Signed-off-by: NWang Sheng-Hui <shhuiw@gmail.com>
Signed-off-by: NNeilBrown <neilb@suse.de>
      7e841526
    • N
      md/bitmap: improve handling of 'allclean'. · 2585f3ef
      由 NeilBrown 提交于 
      The 'allclean' flag is used to cache the fact that there is nothing to
do, so we can avoid waking up and scanning the bitmap regularly.

The two sorts of pages that might need the attention of the bitmap
daemon are BITMAP_PAGE_PENDING and BITMAP_PAGE_NEEDWRITE pages.

So make sure allclean reflects exactly when there are none of those.
So:
  set it before scanning all pages with either bit set.
  clear it whenever these bits are set
  clear it when we desire not to clear one of these bits.
  don't clear it any other time.
Signed-off-by: NNeilBrown <neilb@suse.de>
      2585f3ef
    • N
      md/bitmap: rename and tidy up BITMAP_PAGE_CLEAN · 5a537df4
      由 NeilBrown 提交于 
      The flag 'BITMAP_PAGE_CLEAN' has a confusing name as it doesn't mean
that the page is clean, but rather that there are counters in the page
which allow bits in the bitmap to be cleared - i.e. maybe cleaning can
happen.

So change it to BITMAP_PAGE_PENDING and fix some irregularities:
 - Don't set it in bitmap_init_from_disk as bitmap_set_memory_bits
   sets it when needed
 - in bitmap_daemon_work, if we find a counter that is '1', but
   need_sync is set, then set BITMAP_PAGE_PENDING again (it was
   recently cleared) to ensure we don't forget about this bit.

Signed-off-by: NeilBrown <neilb@suse.de>
      5a537df4
    • N
      md: Avoid waking up a thread after it has been freed. · 01f96c0a
      由 NeilBrown 提交于 
      Two related problems:

1/ some error paths call "md_unregister_thread(mddev->thread)"
   without subsequently clearing ->thread.  A subsequent call
   to mddev_unlock will try to wake the thread, and crash.

2/ Most calls to md_wakeup_thread are protected against the thread
   disappeared either by:
      - holding the ->mutex
      - having an active request, so something else must be keeping
        the array active.
   However mddev_unlock calls md_wakeup_thread after dropping the
   mutex and without any certainty of an active request, so the
   ->thread could theoretically disappear.
   So we need a spinlock to provide some protections.

So change md_unregister_thread to take a pointer to the thread
pointer, and ensure that it always does the required locking, and
clears the pointer properly.
Reported-by: N"Moshe Melnikov" <moshe@zadarastorage.com>
Signed-off-by: NNeilBrown <neilb@suse.de>
cc: stable@kernel.org
      01f96c0a
  7. 10 9月, 2011 4 次提交
    • N
      md: Fix handling for devices from 2TB to 4TB in 0.90 metadata. · 27a7b260
      由 NeilBrown 提交于 
      0.90 metadata uses an unsigned 32bit number to count the number of
kilobytes used from each device.
This should allow up to 4TB per device.
However we multiply this by 2 (to get sectors) before casting to a
larger type, so sizes above 2TB get truncated.

Also we allow rdev->sectors to be larger than 4TB, so it is possible
for the array to be resized larger than the metadata can handle.
So make sure rdev->sectors never exceeds 4TB when 0.90 metadata is in
used.

Also the sanity check at the end of super_90_load should include level
1 as it used ->size too. (RAID0 and Linear don't use ->size at all).
Reported-by: NPim Zandbergen <P.Zandbergen@macroscoop.nl>
Cc: stable@kernel.org
Signed-off-by: NNeilBrown <neilb@suse.de>
      27a7b260
    • N
      md/raid1,10: Remove use-after-free bug in make_request. · 079fa166
      由 NeilBrown 提交于 
      A single request to RAID1 or RAID10 might result in multiple
requests if there are known bad blocks that need to be avoided.

To detect if we need to submit another write request we test:
 	if (sectors_handled < (bio->bi_size >> 9)) {

However this is after we call **_write_done() so the 'bio' no longer
belongs to us - the writes could have completed and the bio freed.

So move the **_write_done call until after the test against
bio->bi_size.

This addresses https://bugzilla.kernel.org/show_bug.cgi?id=41862Reported-by: NBruno Wolff III <bruno@wolff.to>
Tested-by: NBruno Wolff III <bruno@wolff.to>
Signed-off-by: NNeilBrown <neilb@suse.de>
      079fa166
    • N
      md/raid10: unify handling of write completion. · 19d5f834
      由 NeilBrown 提交于 
      A write can complete at two different places:
1/ when the last member-device write completes, through
   raid10_end_write_request
2/ in make_request() when we remove the initial bias from ->remaining.

These two should do exactly the same thing and the comment says they
do, but they don't.

So factor the correct code out into a function and call it in both
places.  This makes the code much more similar to RAID1.

The difference is only significant if there is an error, and they
usually take a while, so it is unlikely that there will be an error
already when make_request is completing, so this is unlikely to cause
real problems.
Signed-off-by: NNeilBrown <neilb@suse.de>
      19d5f834
    • N
      Avoid dereferencing a 'request_queue' after last close. · 94007751
      由 NeilBrown 提交于 
      On the last close of an 'md' device which as been stopped, the device
is destroyed and in particular the request_queue is freed.  The free
is done in a separate thread so it might happen a short time later.

__blkdev_put calls bdev_inode_switch_bdi *after* ->release has been
called.

Since commit f758eeab
bdev_inode_switch_bdi will dereference the 'old' bdi, which lives
inside a request_queue, to get a spin lock.  This causes the last
close on an md device to sometime take a spin_lock which lives in
freed memory - which results in an oops.

So move the called to bdev_inode_switch_bdi before the call to
->release.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Acked-by: NWu Fengguang <fengguang.wu@intel.com>
Cc: stable@kernel.org
Signed-off-by: NNeilBrown <neilb@suse.de>
      94007751
  9. 31 8月, 2011 1 次提交
    • N
      md/raid5: fix a hang on device failure. · 43220aa0
      由 NeilBrown 提交于 
      Waiting for a 'blocked' rdev to become unblocked in the raid5d thread
cannot work with internal metadata as it is the raid5d thread which
will clear the blocked flag.
This wasn't a problem in 3.0 and earlier as we only set the blocked
flag when external metadata was used then.
However we now set it always, so we need to be more careful.
Signed-off-by: NNeilBrown <neilb@suse.de>
      43220aa0
  11. 30 8月, 2011 1 次提交
  13. 25 8月, 2011 4 次提交
  15. 24 8月, 2011 7 次提交
  17. 23 8月, 2011 8 次提交
  19. 22 8月, 2011 6 次提交