Hi, Here is an updated patchset of LightNVM. It is now integrated directly into the block layer when using blk-mq. I'll like to get some feedback on how it is plugged in. The block layer integration is as follows: block/blk-lightnvm.c holds the setup/teardown functions and calls in to the lightnvm code. Extendied the request queue flags with QUEUE_FLAG_LIGHTNVM when the queue is a LightNVM queue. The struct request structure is extended with a ->phys_sector, that holds the physical address that a logical address is mapped to. The ->phys_sector is set by blk_lightnvm_map, that calls into lightnvm and allocate new address on writes, and similarly look up an address on reads. A request has a NVM_MAP flag set when it has been mapped. This is used to know if completion logic should be run on blk-mq completion. It might now be for some targets. The request cmd_size field is extended to hold any per-request information that lightnvm requires for its bookkeeping. A branch with the patches can be found here: https://github.com/OpenChannelSSD/linux.git lkml_v1 It is currently based on 3.17 on top of the NVMe blk-mq conversion. For testing, the null_blk driver can be instantiated with: lightnvm_enable=1 gb=4 bs=4096 nr_devices=1 or by using the qemu branch at: https://github.com/OpenChannelSSD/qemu-nvme.git master and booting qemu with: -drive file=filepath,if=none,id=mynvme \ -device nvme,drive=mynvme,serial=deadbeef,namespaces=1,lver=1,lchannels=1, \ nlbaf=5,lba_index=3 Todo: Multi-page accesses. Currently limited to sector size IO accesses. Retrieval of mapping table from device. Mapping table is forgot on module unload. Bad block handling. No method to handle flash blocks there are marked bad. Thanks, Matias Jesper Madsen (1): block: extend rq_flag_bits Matias Bjørling (4): block: expose init_request_from_bio lightnvm: Support for Open-Channel SSDs nvme: LightNVM integration null_blk: LightNVM integration Documentation/block/null_blk.txt | 8 + block/Makefile | 1 + block/blk-core.c | 6 + block/blk-lightnvm.c | 81 ++++++ block/blk-mq.c | 35 ++- block/blk-sysfs.c | 13 + block/blk.h | 14 + block/ioctl.c | 1 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/block/null_blk.c | 89 +++++- drivers/block/nvme-core.c | 187 ++++++++++++- drivers/lightnvm/Kconfig | 20 ++ drivers/lightnvm/Makefile | 5 + drivers/lightnvm/core.c | 208 ++++++++++++++ drivers/lightnvm/gc.c | 370 ++++++++++++++++++++++++ drivers/lightnvm/nvm.c | 460 ++++++++++++++++++++++++++++++ drivers/lightnvm/nvm.h | 588 +++++++++++++++++++++++++++++++++++++++ drivers/lightnvm/sysfs.c | 68 +++++ drivers/lightnvm/targets.c | 244 ++++++++++++++++ include/linux/blk-mq.h | 1 + include/linux/blk_types.h | 4 + include/linux/blkdev.h | 24 ++ include/linux/lightnvm.h | 112 ++++++++ include/linux/nvme.h | 1 + include/trace/events/nvm.h | 70 +++++ include/uapi/linux/nvme.h | 74 +++++ 27 files changed, 2677 insertions(+), 10 deletions(-) create mode 100644 block/blk-lightnvm.c create mode 100644 drivers/lightnvm/Kconfig create mode 100644 drivers/lightnvm/Makefile create mode 100644 drivers/lightnvm/core.c create mode 100644 drivers/lightnvm/gc.c create mode 100644 drivers/lightnvm/nvm.c create mode 100644 drivers/lightnvm/nvm.h create mode 100644 drivers/lightnvm/sysfs.c create mode 100644 drivers/lightnvm/targets.c create mode 100644 include/linux/lightnvm.h create mode 100644 include/trace/events/nvm.h -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
