Hi Mikulas,
This is V2 for dm-pcache, please take a look.
Code:
https://github.com/DataTravelGuide/linux tags/pcache_v2
Changelogs
V2 from V1:
- introduce req_alloc() and req_init() in backing_dev.c, then we
can do req_alloc() before holding spinlock and do req_init()
in subtree_walk().
- introduce pre_alloc_key and pre_alloc_req in walk_ctx, that
means we can pre-allocate cache_key or backing_dev_request
before subtree walking.
- use mempool_alloc() with NOIO for the allocation of cache_key
and backing_dev_req.
- some coding style changes from comments of Jonathan.
V1 from RFC-V2:
- use crc32c to replace crc32
- only retry pcache_req when cache full, add pcache_req into defer_list,
and wait cache invalidation happen.
- new format for pcache table, it is more easily extended with
new parameters later.
- remove __packed.
- use spin_lock_irq in req_complete_fn to replace
spin_lock_irqsave.
- fix bug in backing_dev_bio_end with spin_lock_irqsave.
- queue_work() inside spinlock.
- introduce inline_bvecs in backing_dev_req.
- use kmalloc_array for bvecs allocation.
- calculate ->off with dm_target_offset() before use it.
Dongsheng Yang (11):
dm-pcache: add pcache_internal.h
dm-pcache: add backing device management
dm-pcache: add cache device
dm-pcache: add segment layer
dm-pcache: add cache_segment
dm-pcache: add cache_writeback
dm-pcache: add cache_gc
dm-pcache: add cache_key
dm-pcache: add cache_req
dm-pcache: add cache core
dm-pcache: initial dm-pcache target
.../admin-guide/device-mapper/dm-pcache.rst | 201 ++++
MAINTAINERS | 8 +
drivers/md/Kconfig | 2 +
drivers/md/Makefile | 1 +
drivers/md/dm-pcache/Kconfig | 17 +
drivers/md/dm-pcache/Makefile | 3 +
drivers/md/dm-pcache/backing_dev.c | 345 +++++++
drivers/md/dm-pcache/backing_dev.h | 93 ++
drivers/md/dm-pcache/cache.c | 432 +++++++++
drivers/md/dm-pcache/cache.h | 616 ++++++++++++
drivers/md/dm-pcache/cache_dev.c | 299 ++++++
drivers/md/dm-pcache/cache_dev.h | 70 ++
drivers/md/dm-pcache/cache_gc.c | 170 ++++
drivers/md/dm-pcache/cache_key.c | 900 ++++++++++++++++++
drivers/md/dm-pcache/cache_req.c | 840 ++++++++++++++++
drivers/md/dm-pcache/cache_segment.c | 293 ++++++
drivers/md/dm-pcache/cache_writeback.c | 279 ++++++
drivers/md/dm-pcache/dm_pcache.c | 466 +++++++++
drivers/md/dm-pcache/dm_pcache.h | 65 ++
drivers/md/dm-pcache/pcache_internal.h | 117 +++
drivers/md/dm-pcache/segment.c | 61 ++
drivers/md/dm-pcache/segment.h | 73 ++
22 files changed, 5351 insertions(+)
create mode 100644 Documentation/admin-guide/device-mapper/dm-pcache.rst
create mode 100644 drivers/md/dm-pcache/Kconfig
create mode 100644 drivers/md/dm-pcache/Makefile
create mode 100644 drivers/md/dm-pcache/backing_dev.c
create mode 100644 drivers/md/dm-pcache/backing_dev.h
create mode 100644 drivers/md/dm-pcache/cache.c
create mode 100644 drivers/md/dm-pcache/cache.h
create mode 100644 drivers/md/dm-pcache/cache_dev.c
create mode 100644 drivers/md/dm-pcache/cache_dev.h
create mode 100644 drivers/md/dm-pcache/cache_gc.c
create mode 100644 drivers/md/dm-pcache/cache_key.c
create mode 100644 drivers/md/dm-pcache/cache_req.c
create mode 100644 drivers/md/dm-pcache/cache_segment.c
create mode 100644 drivers/md/dm-pcache/cache_writeback.c
create mode 100644 drivers/md/dm-pcache/dm_pcache.c
create mode 100644 drivers/md/dm-pcache/dm_pcache.h
create mode 100644 drivers/md/dm-pcache/pcache_internal.h
create mode 100644 drivers/md/dm-pcache/segment.c
create mode 100644 drivers/md/dm-pcache/segment.h
--
2.43.0
