diff options
Diffstat (limited to 'include/sys/uberblock_impl.h')
| -rw-r--r-- | include/sys/uberblock_impl.h | 58 |
1 files changed, 55 insertions, 3 deletions
diff --git a/include/sys/uberblock_impl.h b/include/sys/uberblock_impl.h index 113df7c61..91699e651 100644 --- a/include/sys/uberblock_impl.h +++ b/include/sys/uberblock_impl.h @@ -44,7 +44,36 @@ extern "C" { */ #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ #define UBERBLOCK_SHIFT 10 /* up to 1K */ -#define MMP_MAGIC 0xa11cea11 /* all-see-all */ +#define MMP_MAGIC 0xa11cea11 /* all-see-all */ + +#define MMP_INTERVAL_VALID_BIT 0x01 +#define MMP_SEQ_VALID_BIT 0x02 +#define MMP_FAIL_INT_VALID_BIT 0x04 + +#define MMP_VALID(ubp) (ubp->ub_magic == UBERBLOCK_MAGIC && \ + ubp->ub_mmp_magic == MMP_MAGIC) +#define MMP_INTERVAL_VALID(ubp) (MMP_VALID(ubp) && (ubp->ub_mmp_config & \ + MMP_INTERVAL_VALID_BIT)) +#define MMP_SEQ_VALID(ubp) (MMP_VALID(ubp) && (ubp->ub_mmp_config & \ + MMP_SEQ_VALID_BIT)) +#define MMP_FAIL_INT_VALID(ubp) (MMP_VALID(ubp) && (ubp->ub_mmp_config & \ + MMP_FAIL_INT_VALID_BIT)) + +#define MMP_INTERVAL(ubp) ((ubp->ub_mmp_config & 0x00000000FFFFFF00) \ + >> 8) +#define MMP_SEQ(ubp) ((ubp->ub_mmp_config & 0x0000FFFF00000000) \ + >> 32) +#define MMP_FAIL_INT(ubp) ((ubp->ub_mmp_config & 0xFFFF000000000000) \ + >> 48) + +#define MMP_INTERVAL_SET(write) \ + (((uint64_t)(write & 0xFFFFFF) << 8) | MMP_INTERVAL_VALID_BIT) + +#define MMP_SEQ_SET(seq) \ + (((uint64_t)(seq & 0xFFFF) << 32) | MMP_SEQ_VALID_BIT) + +#define MMP_FAIL_INT_SET(fail) \ + (((uint64_t)(fail & 0xFFFF) << 48) | MMP_FAIL_INT_VALID_BIT) struct uberblock { uint64_t ub_magic; /* UBERBLOCK_MAGIC */ @@ -59,8 +88,31 @@ struct uberblock { /* Maybe missing in uberblocks we read, but always written */ uint64_t ub_mmp_magic; /* MMP_MAGIC */ - uint64_t ub_mmp_delay; /* nanosec since last MMP write */ - uint64_t ub_mmp_seq; /* reserved for sequence number */ + /* + * If ub_mmp_delay == 0 and ub_mmp_magic is valid, MMP is off. + * Otherwise, nanosec since last MMP write. + */ + uint64_t ub_mmp_delay; + + /* + * The ub_mmp_config contains the multihost write interval, multihost + * fail intervals, sequence number for sub-second granularity, and + * valid bit mask. This layout is as follows: + * + * 64 56 48 40 32 24 16 8 0 + * +-------+-------+-------+-------+-------+-------+-------+-------+ + * 0 | Fail Intervals| Seq | Write Interval (ms) | VALID | + * +-------+-------+-------+-------+-------+-------+-------+-------+ + * + * This allows a write_interval of (2^24/1000)s, over 4.5 hours + * + * VALID Bits: + * - 0x01 - Write Interval (ms) + * - 0x02 - Sequence number exists + * - 0x04 - Fail Intervals + * - 0xf8 - Reserved + */ + uint64_t ub_mmp_config; /* * ub_checkpoint_txg indicates two things about the current uberblock: |