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During pool export flush the ARC asynchronously

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This also includes removing L2 vdevs asynchronously.

This commit also guarantees that spa_load_guid is unique.

The zpool reguid feature introduced the spa_load_guid, which is a
transient value used for runtime identification purposes in the ARC.
This value is not the same as the spa's persistent pool guid.

However, the value is seeded from spa_generate_load_guid() which
does not check for uniqueness against the spa_load_guid from other
pools.  Although extremely rare, you can end up with two different
pools sharing the same spa_load_guid value! So we guarantee that
the value is always unique and additionally not still in use by an
async arc flush task.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Don Brady <don.brady@klarasystems.com>
Closes #16215
This commit is contained in:
Don Brady
2024-12-05 09:58:20 -07:00
committed by GitHub
parent 2507db612d
commit 44446dccdb
7 changed files with 341 additions and 82 deletions
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include/sys/arc.h
+9
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@@ -63,8 +63,15 @@ extern "C" {
(hdr)->b_psize = ((x) >> SPA_MINBLOCKSHIFT); \
} while (0)
/* The l2size in the header is only used by L2 cache */
#define HDR_SET_L2SIZE(hdr, x) do { \
ASSERT(IS_P2ALIGNED((x), 1U << SPA_MINBLOCKSHIFT)); \
(hdr)->b_l2size = ((x) >> SPA_MINBLOCKSHIFT); \
} while (0)
#define HDR_GET_LSIZE(hdr) ((hdr)->b_lsize << SPA_MINBLOCKSHIFT)
#define HDR_GET_PSIZE(hdr) ((hdr)->b_psize << SPA_MINBLOCKSHIFT)
#define HDR_GET_L2SIZE(hdr) ((hdr)->b_l2size << SPA_MINBLOCKSHIFT)
typedef struct arc_buf_hdr arc_buf_hdr_t;
typedef struct arc_buf arc_buf_t;
@@ -322,8 +329,10 @@ void arc_freed(spa_t *spa, const blkptr_t *bp);
int arc_cached(spa_t *spa, const blkptr_t *bp);
void arc_flush(spa_t *spa, boolean_t retry);
void arc_flush_async(spa_t *spa);
void arc_tempreserve_clear(uint64_t reserve);
int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg);
boolean_t arc_async_flush_guid_inuse(uint64_t load_guid);
uint64_t arc_all_memory(void);
uint64_t arc_default_max(uint64_t min, uint64_t allmem);