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ddt: rework access to phys array slots

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The "flat phys" feature will use only a single phys slot for all
entries, which means the old "single", "double" etc naming now makes no
sense, and more importantly, means that choosing the right slot for a
given block pointer will depend on how many slots are in use for a given
DDT.

This removes the old names, and adds accessor macros to decouple
specific phys array indexes from any particular meaning.

(These macros look strange in isolation, mainly in the way they take the
ddt_t* as an arg but don't use it. This is mostly a separate commit to
introduce the concept to the reader before the "flat phys" commit
extends it).

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: iXsystems, Inc.
Closes #15893
This commit is contained in:
Rob Norris
2023-07-03 15:16:02 +10:00
committed by Brian Behlendorf
parent d63f5d7e50
commit d17ab631a9
8 changed files with 79 additions and 65 deletions
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include/sys/ddt_impl.h
+1 -1
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@@ -82,7 +82,7 @@ extern void ddt_stat_update(ddt_t *ddt, ddt_entry_t *dde, uint64_t neg);
*/
#define DDT_NAMELEN 32
extern uint64_t ddt_phys_total_refcnt(const ddt_entry_t *dde);
extern uint64_t ddt_phys_total_refcnt(const ddt_t *ddt, const ddt_entry_t *dde);
extern void ddt_key_fill(ddt_key_t *ddk, const blkptr_t *bp);