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lightnvm: add is_cached entry to struct ppa_addr

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A target requires a method to identify PPAs that are either cached in
memory or on disk. This can efficiently be maintained within the PPA.
The target host-side translation table can then lookup a PPA and know
from the PPA if it is cached or on disk. In the case it is cached, it is
the responsibility of the target to maintain this cache.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling 2016-05-06 20:03:19 +02:00 committed by Jens Axboe
parent 04a8aa173b
commit df414b33bb
1 changed files with 7 additions and 1 deletions
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8
include/linux/lightnvm.h
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@ -18,7 +18,7 @@ enum {
#define NVM_SEC_BITS (8)
#define NVM_PL_BITS (8)
#define NVM_LUN_BITS (8)
#define NVM_CH_BITS (8)
#define NVM_CH_BITS (7)
struct ppa_addr {
/* Generic structure for all addresses */
@ -30,8 +30,14 @@ struct ppa_addr {
u64 pl : NVM_PL_BITS;
u64 lun : NVM_LUN_BITS;
u64 ch : NVM_CH_BITS;
u64 reserved : 1;
} g;
struct {
u64 line : 63;
u64 is_cached : 1;
} c;
u64 ppa;
};
};