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  1. 31 3月, 2009 2 次提交
    • 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 6 次提交