The consensus from LSF was that bcache need not invent a new interface
when md and dm can both do the job. As mentioned in patch 7 this series
aims to be a minimal conversion. Other refactoring items like
deprecating register_lock for mddev->reconfig_mutex are deferred.
This supports assembly of an already established cache array:
mdadm -A /dev/md/bcache /dev/sd[ab]
...will create the /dev/md/bcache container and a subarray representing
the cache volume. "Flash-only", or backing-device only volumes were not
tested. "Create" support and hot-add/hot-remove come later.
Note:
* When attempting to test with small loopback devices (100MB), assembly
soft locks in bcache_journal_read(). That hang went away with larger
devices, so there seems to be minimum component device size that needs
to be considered in the tooling.
---
Dan Williams (7):
bcache: compile fix
bcache: disable lockdep, enable CONFIG_BCACHE=m
bcache: drop select COMPACTION
bcache: fix symlink removal
bcache: move to drivers/md/
bcache: uplevel allocation of 'cached_dev' and 'cache'
md: add bcache personality
drivers/block/Kconfig | 2
drivers/block/Makefile | 1
drivers/md/Kconfig | 14 +
drivers/md/Makefile | 1
drivers/md/bcache/Kconfig | 3
drivers/md/bcache/Makefile | 2
drivers/md/bcache/alloc.c | 0
drivers/md/bcache/bcache.h | 39 ++++
drivers/md/bcache/bset.c | 0
drivers/md/bcache/bset.h | 0
drivers/md/bcache/btree.c | 18 --
drivers/md/bcache/btree.h | 0
drivers/md/bcache/debug.c | 0
drivers/md/bcache/debug.h | 0
drivers/md/bcache/io.c | 0
drivers/md/bcache/journal.c | 0
drivers/md/bcache/journal.h | 0
drivers/md/bcache/md.c | 374 ++++++++++++++++++++++++++++++++++++
drivers/md/bcache/request.c | 24 +-
drivers/md/bcache/request.h | 0
drivers/md/bcache/stats.c | 0
drivers/md/bcache/stats.h | 0
drivers/md/bcache/super.c | 394 +++++++++-----------------------------
drivers/md/bcache/sysfs.c | 49 -----
drivers/md/bcache/sysfs.h | 0
drivers/md/bcache/trace.c | 0
drivers/md/bcache/util.c | 2
drivers/md/bcache/util.h | 3
drivers/md/bcache/writeback.c | 0
kernel/lockdep.c | 1
30 files changed, 539 insertions(+), 388 deletions(-)
rename drivers/{block/bcache/Kconfig => md/bcache/Kconfig} (95%)
rename drivers/{block/bcache/Makefile => md/bcache/Makefile} (77%)
rename drivers/{block/bcache/alloc.c => md/bcache/alloc.c} (100%)
rename drivers/{block/bcache/bcache.h => md/bcache/bcache.h} (94%)
rename drivers/{block/bcache/bset.c => md/bcache/bset.c} (100%)
rename drivers/{block/bcache/bset.h => md/bcache/bset.h} (100%)
rename drivers/{block/bcache/btree.c => md/bcache/btree.c} (99%)
rename drivers/{block/bcache/btree.h => md/bcache/btree.h} (100%)
rename drivers/{block/bcache/debug.c => md/bcache/debug.c} (100%)
rename drivers/{block/bcache/debug.h => md/bcache/debug.h} (100%)
rename drivers/{block/bcache/io.c => md/bcache/io.c} (100%)
rename drivers/{block/bcache/journal.c => md/bcache/journal.c} (100%)
rename drivers/{block/bcache/journal.h => md/bcache/journal.h} (100%)
create mode 100644 drivers/md/bcache/md.c
rename drivers/{block/bcache/request.c => md/bcache/request.c} (98%)
rename drivers/{block/bcache/request.h => md/bcache/request.h} (100%)
rename drivers/{block/bcache/stats.c => md/bcache/stats.c} (100%)
rename drivers/{block/bcache/stats.h => md/bcache/stats.h} (100%)
rename drivers/{block/bcache/super.c => md/bcache/super.c} (83%)
rename drivers/{block/bcache/sysfs.c => md/bcache/sysfs.c} (95%)
rename drivers/{block/bcache/sysfs.h => md/bcache/sysfs.h} (100%)
rename drivers/{block/bcache/trace.c => md/bcache/trace.c} (100%)
rename drivers/{block/bcache/util.c => md/bcache/util.c} (99%)
rename drivers/{block/bcache/util.h => md/bcache/util.h} (99%)
rename drivers/{block/bcache/writeback.c => md/bcache/writeback.c} (100%)
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