linux-toradex.git/drivers/md/bitmap.c, branch v3.2-rc5

md/lock: ensure updates to page_attrs are properly locked.

2011-11-22T23:18:52+00:00

Page attributes are set using __set_bit rather than set_bit as
it normally called under a spinlock so the extra atomicity is not
needed.

However there are two places where we might set or clear page
attributes without holding the spinlock.
So add the spinlock in those cases.

This might be the cause of occasional reports that bits a aren't
getting clear properly - theory is that BITMAP_PAGE_PENDING gets lost
when BITMAP_PAGE_NEEDWRITE is set or cleared.  This is an
inconvenience, not a threat to data safety.

Signed-off-by: NeilBrown

md/bitmap remove fault injection options.

2011-10-11T05:49:56+00:00

These are too hard to use to be much more than noise.

Signed-off-by: NeilBrown

md: remove typedefs: mddev_t -> struct mddev

2011-10-11T05:47:53+00:00

Having mddev_t and 'struct mddev_s' is ugly and not preferred

Signed-off-by: NeilBrown

md: removing typedefs: mdk_rdev_t -> struct md_rdev

2011-10-11T05:45:26+00:00

The typedefs are just annoying. 'mdk' probably refers to 'md_k.h'
which used to be an include file that defined this thing.

Signed-off-by: NeilBrown

md: remove PRINTK and dprintk debugging and use pr_debug

2011-10-07T03:23:17+00:00

Being able to dynamically enable these make them much more useful.

Signed-off-by: NeilBrown

md/bitmap: improve handling of 'allclean'.

2011-09-21T05:37:46+00:00

The 'allclean' flag is used to cache the fact that there is nothing to
do, so we can avoid waking up and scanning the bitmap regularly.

The two sorts of pages that might need the attention of the bitmap
daemon are BITMAP_PAGE_PENDING and BITMAP_PAGE_NEEDWRITE pages.

So make sure allclean reflects exactly when there are none of those.
So:
  set it before scanning all pages with either bit set.
  clear it whenever these bits are set
  clear it when we desire not to clear one of these bits.
  don't clear it any other time.

Signed-off-by: NeilBrown

md/bitmap: rename and tidy up BITMAP_PAGE_CLEAN

2011-09-21T05:37:46+00:00

The flag 'BITMAP_PAGE_CLEAN' has a confusing name as it doesn't mean
that the page is clean, but rather that there are counters in the page
which allow bits in the bitmap to be cleared - i.e. maybe cleaning can
happen.

So change it to BITMAP_PAGE_PENDING and fix some irregularities:
 - Don't set it in bitmap_init_from_disk as bitmap_set_memory_bits
   sets it when needed
 - in bitmap_daemon_work, if we find a counter that is '1', but
   need_sync is set, then set BITMAP_PAGE_PENDING again (it was
   recently cleared) to ensure we don't forget about this bit.

Signed-off-by: NeilBrown

MD bitmap: Revert DM dirty log hooks

2011-07-27T01:00:37+00:00

Revert most of commit e384e58549a2e9a83071ad80280c1a9053cfd84c
  md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.

MD should not need to use DM's dirty log - we decided to use md's
bitmaps instead.

Keeping the DIV_ROUND_UP clean-ups that were part of commit
e384e58549a2e9a83071ad80280c1a9053cfd84c, however.

Signed-off-by: Jonathan Brassow 
Signed-off-by: NeilBrown

md: use proper little-endian bitops

2011-07-27T01:00:36+00:00

Using __test_and_{set,clear}_bit_le() with ignoring its return value
can be replaced with __{set,clear}_bit_le().

Signed-off-by: Akinobu Mita 
Cc: NeilBrown 
Cc: linux-raid@vger.kernel.org
Signed-off-by: NeilBrown

md/bitmap: remove unused fields from struct bitmap

2011-06-09T01:43:01+00:00

Get rid of ->syncchunk and ->counter_bits since they're never used.

Also discard COUNTER_BYTE_RATIO which is unused.

Signed-off-by: Namhyung Kim 
Signed-off-by: NeilBrown