linux/drivers/md/bcache
Kent Overstreet 2a285686c1 bcache: btree locking rework
Add a new lock, b->write_lock, which is required to actually modify - or write -
a btree node; this lock is only held for short durations.

This means we can write out a btree node without taking b->lock, which _is_ held
for long durations - solving a deadlock when btree_flush_write() (from the
journalling code) is called with a btree node locked.

Right now just occurs in bch_btree_set_root(), but with an upcoming journalling
rework is going to happen a lot more.

This also turns b->lock is now more of a read/intent lock instead of a
read/write lock - but not completely, since it still blocks readers. May turn it
into a real intent lock at some point in the future.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
2014-03-18 12:23:35 -07:00
..
alloc.c bcache: Add a real GC_MARK_RECLAIMABLE 2014-03-18 12:22:36 -07:00
bcache.h bcache: Add a real GC_MARK_RECLAIMABLE 2014-03-18 12:22:36 -07:00
bset.c bcache: Fix another compiler warning on m68k 2014-02-18 08:55:05 -08:00
bset.h bcache: Add bch_keylist_init_single() 2014-03-18 12:22:36 -07:00
btree.c bcache: btree locking rework 2014-03-18 12:23:35 -07:00
btree.h bcache: btree locking rework 2014-03-18 12:23:35 -07:00
closure.c bcache: kill closure locking code 2014-01-08 13:05:08 -08:00
closure.h bcache: kill closure locking code 2014-01-08 13:05:08 -08:00
debug.c bcache: Convert debug code to btree_keys 2014-01-08 13:05:13 -08:00
debug.h bcache: Convert debug code to btree_keys 2014-01-08 13:05:13 -08:00
extents.c bcache: Add a real GC_MARK_RECLAIMABLE 2014-03-18 12:22:36 -07:00
extents.h bcache: Convert debug code to btree_keys 2014-01-08 13:05:13 -08:00
io.c block: Introduce new bio_split() 2013-11-23 22:33:57 -08:00
journal.c bcache: btree locking rework 2014-03-18 12:23:35 -07:00
journal.h bcache: Fix a shutdown bug 2014-02-25 18:42:49 -08:00
Kconfig bcache: Kill dead cgroup code 2014-03-18 12:22:35 -07:00
Makefile bcache: Abstract out stuff needed for sorting 2014-01-08 13:05:12 -08:00
movinggc.c bcache: stop moving_gc marking buckets that can't be moved. 2014-03-18 12:22:34 -07:00
request.c bcache: Kill dead cgroup code 2014-03-18 12:22:35 -07:00
request.h bcache: Kill dead cgroup code 2014-03-18 12:22:35 -07:00
stats.c bcache: Kill dead cgroup code 2014-03-18 12:22:35 -07:00
stats.h bcache: Break up struct search 2013-11-10 21:56:32 -08:00
super.c bcache: btree locking rework 2014-03-18 12:23:35 -07:00
sysfs.c bcache: Improve priority_stats 2014-03-18 12:22:35 -07:00
sysfs.h bcache: Don't export utility code, prefix with bch_ 2013-03-28 12:50:55 -06:00
trace.c bcache: Better alloc tracepoints 2014-03-18 12:22:35 -07:00
util.c Linux 3.13-rc6 2013-12-31 09:51:02 -07:00
util.h bcache: Convert debug code to btree_keys 2014-01-08 13:05:13 -08:00
writeback.c Linux 3.13-rc6 2013-12-31 09:51:02 -07:00
writeback.h block: Abstract out bvec iterator 2013-11-23 22:33:47 -08:00