xudency/sdssd

SoftWare Defined SSD, Move FTL from device to Linux Kernel

SSD Flash translation Layer prototype

compare device-base and host-based

device-based FTL storage stack

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Page Cache
buffer_head
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Generic Block Layer
bio/request
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Official NVMe Driver
/dev/nvme0n1
make_request_fn bio->LBA CMD
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Controller
FW+Logic
(FTL, Checkpoint, gc, WL, error-handle)
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NandFlash

Host-based FTL storage stack  

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Page Cache
buffer_head
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Generic Block Layer
bio
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FSCFTL
/dev/nvme0n1_exp1
make_request_fn
bio->request
fullfill ppa cmd
(FTL Checkpoint gc WL error-handle)
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Official NVMe Driver
NVMe (dma_map irq hwqueue)
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Controller
FW+Logic
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NandFlash
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