kernel.git/drivers/lightnvm/gennvm.c, branch linux-4.5.y

lightnvm: manage open and closed blocks separately

2016-01-12T15:21:17Z

LightNVM targets need to know the state of the flash block when doing flash optimizations. An example is implementing a write buffer to respect the flash page size. Currently, block state is not accounted for; the media manager only differentiates among free, bad and in-use blocks. This patch adds the logic in the generic media manager to enable targets manage blocks into open and close separately, and it implements such management in rrpc. It also adds a set of flags to describe the state of the block (open, closed, free, bad). In order to avoid taking two locks (nvm_lun and rrpc_lun) consecutively, we introduce lockless get_/put_block primitives so that the open and close list locks and future common logic is handled within the nvm_lun lock. Signed-off-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: move rq->error to nvm_rq->error

2016-01-12T15:21:17Z

Instead of passing request error into the LightNVM modules, incorporate it into the nvm_rq. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: support multiple ppas in nvm_erase_ppa

2016-01-12T15:21:17Z

Sometimes a user want to erase multiple PPAs at the same time. Extend nvm_erase_ppa to take multiple ppas and number of ppas to be erased. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: refactor end_io functions for sync

2016-01-12T15:21:16Z

To implement sync I/O support within the LightNVM core, the end_io functions are refactored to take an end_io function pointer instead of testing for initialized media manager, followed by calling its end_io function. Sync I/O can then be implemented using a callback that signal I/O completion. This is similar to the logic found in blk_to_execute_io(). By implementing it this way, the underlying device I/Os submission logic is abstracted away from core, targets, and media managers. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: move ppa erase logic to core

2016-01-12T15:21:16Z

A device may function in single, dual or quad plane mode. The gennvm media manager manages this with explicit helpers. They convert a single ppa to 1, 2 or 4 separate ppas in a ppa list. To aid implementation of recovery and system blocks, this functionality can be moved directly into the core. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: fix incorrect nr_free_blocks stat

2016-01-12T15:21:15Z

When initing bad block list in gennvm_block_bb, once we move bad block from free_list to bb_list, we should maintain both stat info nr_free_blocks and nr_bad_blocks. So this patch fixes to add missing operation related to nr_free_blocks. Signed-off-by: Chao Yu Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: fix bio submission issue

2016-01-12T15:21:15Z

Put bio when submission fails, since we get it before submission. And return error when backend device driver doesn't provide a submit_io method, thus we can end IO properly. Signed-off-by: Wenwei Tao Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: wrong offset in bad blk lun calculation

2015-12-29T15:28:32Z

dev->nr_luns reports the total number of luns available in a device while dev->luns_per_chnl is the number of luns per channel. When multiple channels are available, the offset is calculated from a channel and lun id into a linear array. As it multiplies with the total number of luns, we go out of bound when channel id > 0 and causes the kernel to panic when we read a protected kernel memory area. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: prevent gennvm module unload on use

2015-12-07T16:14:19Z

After the gennvm module has been initialized. It might be attached to one or several devices. In that case, the module is in use. Make sure that it can not be unloaded. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe

lightnvm: replace req queue with nvmdev for lld

2015-12-07T16:14:19Z

In the case where a request queue is passed to the low lever lightnvm device drive integration, the device driver might pass its admin commands through another queue. Instead pass nvm_dev, and let the low level drive the appropriate queue. Reported-by: Christoph Hellwig Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe