linux-toradex.git/drivers/md/bitmap.h, branch v2.6.34

md: Support write-intent bitmaps with externally managed metadata.

2009-12-14T01:51:41+00:00

In this case, the metadata needs to not be in the same
sector as the bitmap.
md will not read/write any bitmap metadata.  Config must be
done via sysfs and when a recovery makes the array non-degraded
again, writing 'true' to 'bitmap/can_clear' will allow bits in
the bitmap to be cleared again.

Signed-off-by: NeilBrown

md: move offset, daemon_sleep and chunksize out of bitmap structure

2009-12-14T01:51:41+00:00

... and into bitmap_info.  These are all configuration parameters
that need to be set before the bitmap is created.

Signed-off-by: NeilBrown

md/bitmap: protect against bitmap removal while being updated.

2009-12-14T01:49:46+00:00

A write intent bitmap can be removed from an array while the
array is active.
When this happens, all IO is suspended and flushed before the
bitmap is removed.
However it is possible that bitmap_daemon_work is still running to
clear old bits from the bitmap.  If it is, it can dereference the
bitmap after it has been freed.

So introduce a new mutex to protect bitmap_daemon_work and get it
before destroying a bitmap.

This is suitable for any current -stable kernel.

Signed-off-by: NeilBrown 
Cc: stable@kernel.org

md: move headers out of include/linux/raid/

2009-03-31T03:27:03+00:00

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: Christoph Hellwig 
Signed-off-by: NeilBrown