linux.git/drivers/md/bcache/sysfs.c, branch v3.13

bcache: New writeback PD controller

2013-12-16T22:22:59+00:00

The old writeback PD controller could get into states where it had throttled all
the way down and take way too long to recover - it was too complicated to really
understand what it was doing.

This rewrites a good chunk of it to hopefully be simpler and make more sense,
and it also pays more attention to units which should make the behaviour a bit
easier to understand.

Signed-off-by: Kent Overstreet

bcache: Bypass torture test

2013-11-11T05:56:43+00:00

More testing ftw! Also, now verify mode doesn't break if you read dirty
data.

Signed-off-by: Kent Overstreet

bcache: Fix sysfs splat on shutdown with flash only devs

2013-11-11T05:56:41+00:00

Whoops.

Signed-off-by: Kent Overstreet

bcache: Kill sequential_merge option

2013-11-11T05:56:39+00:00

It never really made sense to expose this, so just kill it.

Signed-off-by: Kent Overstreet

bcache: Incremental gc

2013-11-11T05:56:37+00:00

Big garbage collection rewrite; now, garbage collection uses the same
mechanisms as used elsewhere for inserting/updating btree node pointers,
instead of rewriting interior btree nodes in place.

This makes the code significantly cleaner and less fragile, and means we
can now make garbage collection incremental - it doesn't have to hold a
write lock on the root of the btree for the entire duration of garbage
collection.

This means that there's less of a latency hit for doing garbage
collection, which means we can gc more frequently (and do a better job
of reclaiming from the cache), and we can coalesce across more btree
nodes (improving our space efficiency).

Signed-off-by: Kent Overstreet

bcache: Debug code improvements

2013-11-11T05:56:34+00:00

Couple changes:
 * Consolidate bch_check_keys() and bch_check_key_order(), and move the
   checks that only check_key_order() could do to bch_btree_iter_next().

 * Get rid of CONFIG_BCACHE_EDEBUG - now, all that code is compiled in
   when CONFIG_BCACHE_DEBUG is enabled, and there's now a sysfs file to
   flip on the EDEBUG checks at runtime.

 * Dropped an old not terribly useful check in rw_unlock(), and
   refactored/improved a some of the other debug code.

Signed-off-by: Kent Overstreet

bcache: Convert gc to a kthread

2013-11-11T05:56:04+00:00

We needed a dedicated rescuer workqueue for gc anyways... and gc was
conceptually a dedicated thread, just one that wasn't running all the
time. Switch it to a dedicated thread to make the code a bit more
straightforward.

Signed-off-by: Kent Overstreet

bcache: Stripe size isn't necessarily a power of two

2013-11-11T05:55:55+00:00

Originally I got this right... except that the divides didn't use
do_div(), which broke 32 bit kernels. When I went to fix that, I forgot
that the raid stripe size usually isn't a power of two... doh

Signed-off-by: Kent Overstreet

bcache: Add on error panic/unregister setting

2013-11-11T05:55:55+00:00

Works kind of like the ext4 setting, to panic or remount read only on
errors.

Signed-off-by: Kent Overstreet

bcache: Strip endline when writing the label through sysfs

2013-09-24T21:41:43+00:00

sysfs attributes with unusual characters have crappy failure modes
in Squeeze (udev 164); later versions of udev are unaffected.

This should make these characters more unusual.

Signed-off-by: Gabriel de Perthuis 
Signed-off-by: Kent Overstreet 
Cc: linux-stable  # >= v3.10
Signed-off-by: Linus Torvalds