Javier González 766c8ceb16 lightnvm: pblk: guarantee that backpointer is respected on writer stall ... pblk's write buffer must guarantee that it respects the device's constrains for reads (i.e., mw_cunits). This is done by maintaining a backpointer that updates the L2P table as entries wrap up, making them point to the media instead of pointing to the write buffer. This mechanism can race in case that the write thread stalls, as the write pointer will protect the last written entry, thus disregarding the read constrains. This patch adds an extra check on wrap up, making sure that the threshold is respected at all times, preventing new entries to overwrite committed data, also in case of write thread stall. Reported-by: Heiner Litz <hlitz@ucsc.edu> Signed-off-by: Javier González <javier@cnexlabs.com> Reviewed-by: Heiner Litz <hlitz@ucsc.edu> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2018-10-09 08:25:08 -06:00
..
core.c
Kconfig
Makefile
pblk-cache.c
pblk-core.c
pblk-gc.c
pblk-init.c	lightnvm: pblk: guarantee that backpointer is respected on writer stall	2018-10-09 08:25:08 -06:00
pblk-map.c
pblk-rb.c	lightnvm: pblk: guarantee that backpointer is respected on writer stall	2018-10-09 08:25:08 -06:00
pblk-read.c
pblk-recovery.c
pblk-rl.c
pblk-sysfs.c
pblk-trace.h
pblk-write.c	lightnvm: pblk: encapsulate rb pointer operations	2018-10-09 08:25:08 -06:00
pblk.h	lightnvm: pblk: guarantee that backpointer is respected on writer stall	2018-10-09 08:25:08 -06:00