lightnvm: pblk: check lba sanity on read path

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As part of pblk's recovery scheme, we store the lba mapped to each
physical sector on the device's out-of-bound (OOB) area.

On the read path, we can use this information to validate that the data
being delivered to the upper layers corresponds to the lba being
requested. The cost of this check is an extra copy on the DMA region on
the device and an extra comparison in the host, given that (i) the OOB
area is being read together with the data in the media, and (ii) the DMA
region allocated for the ppa list can be reused for the metadata stored
on the OOB area.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Javier González 2017-10-13 14:46:22 +02:00 • committed by Jens Axboe

parent 26532ee52b

commit a4809fee4e

2 changed files with 51 additions and 4 deletions

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51

drivers/lightnvm/pblk-read.c

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4

drivers/lightnvm/pblk.h

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