kernel.git/drivers/md/bcache/util.c, branch linux-3.12.y

bcache: Fix a writeback performance regression

2013-09-24T21:41:43Z

Background writeback works by scanning the btree for dirty data and adding those keys into a fixed size buffer, then for each dirty key in the keybuf writing it to the backing device. When read_dirty() finishes and it's time to scan for more dirty data, we need to wait for the outstanding writeback IO to finish - they still take up slots in the keybuf (so that foreground writes can check for them to avoid races) - without that wait, we'll continually rescan when we'll be able to add at most a key or two to the keybuf, and that takes locks that starves foreground IO. Doh. Signed-off-by: Kent Overstreet Cc: linux-stable # >= v3.10 Signed-off-by: Linus Torvalds

bcache: Use standard utility code

2013-07-01T21:43:53Z

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: Fix a format string overflow

2013-04-08T20:33:49Z

Reported-by: Dan Carpenter Signed-off-by: Kent Overstreet

bcache: Sparse fixes

2013-04-08T20:33:48Z

Signed-off-by: Kent Overstreet

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

2013-03-28T18:50:55Z

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

bcache: A block layer cache

2013-03-23T23:11:31Z

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