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  1. 31 3月, 2009 14 次提交
    • N
      md: be more consistent about setting WriteMostly flag when adding a drive to an array · 575a80fa
      由 NeilBrown 提交于 
      When a drive is added to an array using ADD_NEW_DISK, there are two
places we can get certain flags from:  the metadata on the disk or the
flags passed through the IOCTL.

For the WriteMostly flag (aka MD_DISK_WRITEMOSTLY) we take the value
from either of those sources depending on if it is set (i.e. we
effectively 'or' the two sources together).

This makes it awkward to clear, and is at best inconsistent.

As documented code (in mdadm) requires that setting
MD_DISK_WRITEMOSTLY in the ioctl will be effective, we resolve the
inconsistency by always using the value for this flag from the ioctl,
and ignoring the value on disk.
Signed-off-by: NNeilBrown <neilb@suse.de>
      575a80fa
    • N
      md: occasionally checkpoint drive recovery to reduce duplicate effort after a crash · 97e4f42d
      由 NeilBrown 提交于 
      Version 1.x metadata has the ability to record the status of a
partially completed drive recovery.
However we only update that record on a clean shutdown.
It would be nice to update it on unclean shutdowns too, particularly
when using a bitmap that removes much to the 'sync' effort after an
unclean shutdown.

One complication with checkpointing recovery is that we only know
where we are up to in terms of IO requests started, not which ones
have completed.  And we need to know what has completed to record
how much is recovered.  So occasionally pause the recovery until all
submitted requests are completed, then update the record of where
we are up to.

When we have a bitmap, we already do that pause occasionally to keep
the bitmap up-to-date.  So enhance that code to record the recovery
offset and schedule a superblock update.
And when there is no bitmap, just pause 16 times during the resync to
do a checkpoint.
'16' is a fairly arbitrary number.  But we don't really have any good
way to judge how often is acceptable, and it seems like a reasonable
number for now.
Signed-off-by: NNeilBrown <neilb@suse.de>
      97e4f42d
    • N
      md: move md_k.h from include/linux/raid/ to drivers/md/ · 43b2e5d8
      由 NeilBrown 提交于 
      It really is nicer to keep related code together..
Signed-off-by: NNeilBrown <neilb@suse.de>
      43b2e5d8
    • N
      md: move lots of #include lines out of .h files and into .c · bff61975
      由 NeilBrown 提交于 
      This makes the includes more explicit, and is preparation for moving
md_k.h to drivers/md/md.h

Remove include/raid/md.h as its only remaining use was to #include
other files.
Signed-off-by: NNeilBrown <neilb@suse.de>
      bff61975
    • N
      md: move most content from md.h to md_k.h · 92022950
      由 NeilBrown 提交于 
      The extern function definitions are kernel-internal definitions, so
they belong in md_k.h

The MD_*_VERSION values could reasonably go in a number of places,
but md_u.h seems most reasonable.

This leaves almost nothing in md.h.  It will go soon.
Signed-off-by: NNeilBrown <neilb@suse.de>
      92022950
    • N
      md: move LEVEL_* definition from md_k.h to md_u.h · 8b2b5c21
      由 NeilBrown 提交于 
      .. as they are part of the user-space interface.
Also move MdpMinorShift into there so we can remove duplication.

Lastly move mdp_major in.  It is less obviously part of the user-space
interface, but do_mounts_md.c uses it, and it is acting a bit like
user-space.
Signed-off-by: NNeilBrown <neilb@suse.de>
      8b2b5c21
    • C
      md: move headers out of include/linux/raid/ · ef740c37
      由 Christoph Hellwig 提交于 
      Move the headers with the local structures for the disciplines and
bitmap.h into drivers/md/ so that they are more easily grepable for
hacking and not far away.  md.h is left where it is for now as there
are some uses from the outside.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NNeilBrown <neilb@suse.de>
      ef740c37
    • C
      cleanup drivers/md/Makefile · 2a40a8ae
      由 Christoph Hellwig 提交于 
      Use the -y variables instead of the old -objs so we can easily add
conditional objects to the modules.  Also always use += to add
subobjects to avoid problems when placing additional objects in
some place in the file.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NNeilBrown <neilb@suse.de>
      2a40a8ae
    • C
      md: stop defining MAJOR_NR · 3dbd8c2e
      由 Christoph Hellwig 提交于 
      MAJOR_NR was only required for magic in linux/blk.h in 2.4 or earlier
kernels, so no need to keep it around.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NNeilBrown <neilb@suse.de>
      3dbd8c2e
    • M
      MD data integrity support · 3f9d99c1
      由 Martin K. Petersen 提交于 
      md: Add support for data integrity to MD

If all subdevices support the same protection format the MD device is
flagged as integrity capable.
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NNeilBrown <neilb@suse.de>
      3f9d99c1
    • 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 19 次提交