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  1. 19 3月, 2012 7 次提交
    • N
      md/raid10: handle merge_bvec_fn in member devices. · 050b6615
      由 NeilBrown 提交于 
      Currently we don't honour merge_bvec_fn in member devices so if there
is one, we force all requests to be single-page at most.
This is not ideal.

So enhance the raid10 merge_bvec_fn to check that function in children
as well.

This introduces a small problem.  There is no locking around calls
the ->merge_bvec_fn and subsequent calls to ->make_request.  So a
device added between these could end up getting a request which
violates its merge_bvec_fn.

Currently the best we can do is synchronize_sched().  This will work
providing no preemption happens.  If there is preemption, we just
have to hope that new devices are largely consistent with old devices.
Signed-off-by: NNeilBrown <neilb@suse.de>
      050b6615
    • N
      md: add proper merge_bvec handling to RAID0 and Linear. · ba13da47
      由 NeilBrown 提交于 
      These personalities currently set a max request size of one page
when any member device has a merge_bvec_fn because they don't
bother to call that function.

This causes extra works in splitting and combining requests.

So make the extra effort to call the merge_bvec_fn when it exists
so that we end up with larger requests out the bottom.
Signed-off-by: NNeilBrown <neilb@suse.de>
      ba13da47
    • N
      md: tidy up rdev_for_each usage. · dafb20fa
      由 NeilBrown 提交于 
      md.h has an 'rdev_for_each()' macro for iterating the rdevs in an
mddev.  However it uses the 'safe' version of list_for_each_entry,
and so requires the extra variable, but doesn't include 'safe' in the
name, which is useful documentation.

Consequently some places use this safe version without needing it, and
many use an explicity list_for_each entry.

So:
 - rename rdev_for_each to rdev_for_each_safe
 - create a new rdev_for_each which uses the plain
   list_for_each_entry,
 - use the 'safe' version only where needed, and convert all other
   list_for_each_entry calls to use rdev_for_each.
Signed-off-by: NNeilBrown <neilb@suse.de>
      dafb20fa
    • N
      md/raid1,raid10: avoid deadlock during resync/recovery. · d6b42dcb
      由 NeilBrown 提交于 
      If RAID1 or RAID10 is used under LVM or some other stacking
block device, it is possible to enter a deadlock during
resync or recovery.
This can happen if the upper level block device creates
two requests to the RAID1 or RAID10.  The first request gets
processed, blocks recovery and queue requests for underlying
requests in current->bio_list.  A resync request then starts
which will wait for those requests and block new IO.

But then the second request to the RAID1/10 will be attempted
and it cannot progress until the resync request completes,
which cannot progress until the underlying device requests complete,
which are on a queue behind that second request.

So allow that second request to proceed even though there is
a resync request about to start.

This is suitable for any -stable kernel.

Cc: stable@vger.kernel.org
Reported-by: NRay Morris <support@bettercgi.com>
Tested-by: NRay Morris <support@bettercgi.com>
Signed-off-by: NNeilBrown <neilb@suse.de>
      d6b42dcb
    • N
      md/bitmap: ensure to load bitmap when creating via sysfs. · 4474ca42
      由 NeilBrown 提交于 
      When commit 69e51b44 (md/bitmap:  separate out loading a bitmap...)
created bitmap_load, it missed calling it after bitmap_create when a
bitmap is created through the sysfs interface.
So if a bitmap is added this way, we don't allocate memory properly
and can crash.

This is suitable for any -stable release since 2.6.35.
Cc: stable@vger.kernel.org
Signed-off-by: NNeilBrown <neilb@suse.de>
      4474ca42
    • N
      md: don't set md arrays to readonly on shutdown. · c744a65c
      由 NeilBrown 提交于 
      It seems that with recent kernel, writeback can still be happening
while shutdown is happening, and consequently data can be written
after the md reboot notifier switches all arrays to read-only.
This causes a BUG.

So don't switch them to read-only - just mark them clean and
set 'safemode' to '2' which mean that immediately after any
write the array will be switch back to 'clean'.

This could result in the shutdown happening when array is marked
dirty, thus forcing a resync on reboot.  However if you reboot
without performing a "sync" first, you get to keep both halves.

This is suitable for any stable kernel (though there might be some
conflicts with obvious fixes in earlier kernels).

Cc: stable@vger.kernel.org
Signed-off-by: NNeilBrown <neilb@suse.de>
      c744a65c
    • N
      md: allow re-add to failed arrays. · dc10c643
      由 NeilBrown 提交于 
      When an array is failed (some data inaccessible) then there is no
point attempting to add a spare as it could not possibly be recovered.

However that may be value in re-adding a recently removed device.
e.g. if there is a write-intent-bitmap and it is clear, then access
to the data could be restored by this action.

So don't reject a re-add to a failed array for RAID10 and RAID5 (the
only arrays  types that check for a failed array).
Signed-off-by: NNeilBrown <neilb@suse.de>
      dc10c643
  3. 13 3月, 2012 5 次提交
  5. 11 3月, 2012 1 次提交
  7. 10 3月, 2012 7 次提交
  9. 09 3月, 2012 13 次提交
  11. 08 3月, 2012 7 次提交