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Implement dynamic gang header sizes

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ZFS gang block headers are currently fixed at 512 bytes. This is
increasingly wasteful in the era of larger disk sector sizes. This PR
allows any size allocation to work as a gang header. It also contains
supporting changes to ZDB to make gang headers easier to work with.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <rob.norris@klarasystems.com>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Closes #17004
This commit is contained in:
Paul Dagnelie
2025-01-23 16:26:09 -08:00
committed by Brian Behlendorf
parent e845be28e7
commit a981cb69e4
18 changed files with 387 additions and 72 deletions
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cmd/zdb/zdb.c
+3 -3
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@@ -8588,9 +8588,9 @@ zdb_dump_indirect(blkptr_t *bp, int nbps, int flags)
}
static void
zdb_dump_gbh(void *buf, int flags)
zdb_dump_gbh(void *buf, uint64_t size, int flags)
{
zdb_dump_indirect((blkptr_t *)buf, SPA_GBH_NBLKPTRS, flags);
zdb_dump_indirect((blkptr_t *)buf, gbh_nblkptrs(size), flags);
}
static void
@@ -9073,7 +9073,7 @@ zdb_read_block(char *thing, spa_t *spa)
zdb_dump_indirect((blkptr_t *)buf,
orig_lsize / sizeof (blkptr_t), flags);
else if (flags & ZDB_FLAG_GBH)
zdb_dump_gbh(buf, flags);
zdb_dump_gbh(buf, lsize, flags);
else
zdb_dump_block(thing, buf, lsize, flags);