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  1. 31 3月, 2009 4 次提交
    • N
      md: write bitmap information to devices that are undergoing recovery. · 355a43e6
      由 NeilBrown 提交于 
      When we add some spares to an array and start recovery, and we have
a bitmap which is stored 'internally' on all devices, we call
bitmap_write_all to make sure the bitmap is correct on the new
device(s).
However that doesn't work as write_sb_page only writes to
'In_sync' devices, and devices undergoing recovery are not
'In_sync' until recovery finishes.

So extend write_sb_page (actually next_active_rdev) to include devices
that are under recovery.
Signed-off-by: NNeilBrown <neilb@suse.de>
      355a43e6
    • N
      md: never clear bit from the write-intent bitmap when the array is degraded. · d0a4bb49
      由 NeilBrown 提交于 
      
It is safe to clear a bit from the write-intent bitmap for a raid1
if we know the data has been written to all devices, which is
what the current test does.

But it is not always safe to update the 'events_cleared' counter in
that case.  This is because one request could complete successfully
after some other request has partially failed.

So simply disable the clearing and updating of events_cleared whenever
the array is degraded.  This might end up not clearing some bits that
could safely be cleared, but it is safest approach.

Note that the bug fixed here did not risk corrupting data by letting
the array get out-of-sync.  Rather it meant that when a device is
removed and re-added to the array, it might incorrectly require a full
recovery rather than just recovering based on the bitmap.
Signed-off-by: NNeilBrown <neilb@suse.de>
      d0a4bb49
    • N
      md: Allow write-intent bitmaps to have chunksize < PAGE_SIZE · 1187cf0a
      由 NeilBrown 提交于 
      md currently insists that the chunk size used for write-intent
bitmaps (the amount of data that corresponds to one chunk)
be at least one page.

The reason for this restriction is lost in the mists of time,
but a review of the code (and a vague memory) suggests that the only
problem would be related to resync.  Resync tries very hard to
work in multiples of a page, but also needs to sync with units
of a bitmap_chunk too.

This connection comes out in the bitmap_start_sync call.

So change bitmap_start_sync to always work in multiples of a page.
If the bitmap chunk size is less that one page, we flag multiple
chunks as 'syncing' and generally make them all appear to the
resync routines like one chunk.

All other code either already works with data ranges that could
span multiple chunks, or explicitly only cares about a single chunk.
Signed-off-by: NNeil Brown <neilb@suse.de>
      1187cf0a
    • N
      md: Fix is_mddev_idle test (again). · eea1bf38
      由 NeilBrown 提交于 
      There are two problems with is_mddev_idle.

1/ sync_io is 'atomic_t' and hence 'int'.  curr_events and all the
   rest are 'long'.
   So if sync_io were to wrap on a 64bit host, the value of
   curr_events would go very negative suddenly, and take a very
   long time to return to positive.

   So do all calculations as 'int'.  That gives us plenty of precision
   for what we need.

2/ To initialise rdev->last_events we simply call is_mddev_idle, on
   the assumption that it will make sure that last_events is in a
   suitable range.  It used to do this, but now it does not.
   So now we need to be more explicit about initialisation.
Signed-off-by: NNeilBrown <neilb@suse.de>
      eea1bf38
  3. 10 3月, 2009 7 次提交
  5. 09 3月, 2009 20 次提交
  7. 08 3月, 2009 2 次提交
  9. 07 3月, 2009 3 次提交
  11. 06 3月, 2009 4 次提交