kernel/linux.git/drivers/md/bcache/writeback.c, branch v3.11.1

bcache: Use standard utility code

2013-07-01T21:43:53+00:00

Some of bcache's utility code has made it into the rest of the kernel, so drop the bcache versions. Bcache used to have a workaround for allocating from a bio set under generic_make_request() (if you allocated more than once, the bios you already allocated would get stuck on current->bio_list when you submitted, and you'd risk deadlock) - bcache would mask out __GFP_WAIT when allocating bios under generic_make_request() so that allocation could fail and it could retry from workqueue. But bio_alloc_bioset() has a workaround now, so we can drop this hack and the associated error handling. Signed-off-by: Kent Overstreet

bcache: Write out full stripes

2013-06-27T04:58:04+00:00

Now that we're tracking dirty data per stripe, we can add two optimizations for raid5/6: * If a stripe is already dirty, force writes to that stripe to writeback mode - to help build up full stripes of dirty data * When flushing dirty data, preferentially write out full stripes first if there are any. Signed-off-by: Kent Overstreet

bcache: Track dirty data by stripe

2013-06-27T04:57:23+00:00

To make background writeback aware of raid5/6 stripes, we first need to track the amount of dirty data within each stripe - we do this by breaking up the existing sectors_dirty into per stripe atomic_ts Signed-off-by: Kent Overstreet

bcache: Initialize sectors_dirty when attaching

2013-06-27T00:09:16+00:00

Previously, dirty_data wouldn't get initialized until the first garbage collection... which was a bit of a problem for background writeback (as the PD controller keys off of it) and also confusing for users. This is also prep work for making background writeback aware of raid5/6 stripes. Signed-off-by: Kent Overstreet

bcache: Fix/revamp tracepoints

2013-06-27T00:09:15+00:00

The tracepoints were reworked to be more sensible, and fixed a null pointer deref in one of the tracepoints. Converted some of the pr_debug()s to tracepoints - this is partly a performance optimization; it used to be that with DEBUG or CONFIG_DYNAMIC_DEBUG pr_debug() was an empty macro; but at some point it was changed to an empty inline function. Some of the pr_debug() statements had rather expensive function calls as part of the arguments, so this code was getting run unnecessarily even on non debug kernels - in some fast paths, too. Signed-off-by: Kent Overstreet

bcache: Fix error handling in init code

2013-05-15T07:48:14+00:00

This code appears to have rotted... fix various bugs and do some refactoring. Signed-off-by: Kent Overstreet

bcache: Don't export utility code, prefix with bch_

2013-03-28T18:50:55+00:00

Signed-off-by: Kent Overstreet Cc: linux-bcache@vger.kernel.org Signed-off-by: Jens Axboe

bcache: A block layer cache

2013-03-23T23:11:31+00:00

Does writethrough and writeback caching, handles unclean shutdown, and has a bunch of other nifty features motivated by real world usage. See the wiki at http://bcache.evilpiepirate.org for more. Signed-off-by: Kent Overstreet