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ddt: introduce lightweight entry

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The idea here is that sometimes you need the contents of an entry with
no intent to modify it, and/or from a place where its difficult to get
hold of its originating ddt_t to know how to interpret it.

A lightweight entry contains everything you might need to "read" an
entry - its key, type and phys contents - but none of the extras for
modifying it or using it in a larger context. It also has the full
complement of phys slots, so it can represent any kind of dedup entry
without having to know the specific configuration of the table it came
from.

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 22:16:04 +10:00
committed by Brian Behlendorf
parent d17ab631a9
commit 4d686c3da5
6 changed files with 58 additions and 34 deletions
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include/sys/ddt_impl.h
+12 -1
View File
@@ -41,6 +41,17 @@ extern "C" {
#define DDT_DIR_VERSION "version"
#define DDT_DIR_FLAGS "flags"
/* Fill a lightweight entry from a live entry. */
#define DDT_ENTRY_TO_LIGHTWEIGHT(ddt, dde, ddlwe) do { \
memset((ddlwe), 0, sizeof (*ddlwe)); \
(ddlwe)->ddlwe_key = (dde)->dde_key; \
(ddlwe)->ddlwe_type = (dde)->dde_type; \
(ddlwe)->ddlwe_class = (dde)->dde_class; \
(ddlwe)->ddlwe_nphys = DDT_NPHYS(ddt); \
for (int p = 0; p < (ddlwe)->ddlwe_nphys; p++) \
(ddlwe)->ddlwe_phys[p] = (dde)->dde_phys[p]; \
} while (0)
/*
* Ops vector to access a specific DDT object type.
*/
@@ -91,7 +102,7 @@ extern void ddt_stat_add(ddt_stat_t *dst, const ddt_stat_t *src, uint64_t neg);
extern void ddt_object_name(ddt_t *ddt, ddt_type_t type, ddt_class_t clazz,
char *name);
extern int ddt_object_walk(ddt_t *ddt, ddt_type_t type, ddt_class_t clazz,
uint64_t *walk, ddt_entry_t *dde);
uint64_t *walk, ddt_lightweight_entry_t *ddlwe);
extern int ddt_object_count(ddt_t *ddt, ddt_type_t type, ddt_class_t clazz,
uint64_t *count);
extern int ddt_object_info(ddt_t *ddt, ddt_type_t type, ddt_class_t clazz,