libzdb: Initial breakout of libzdb

Step 1 in trying to slowly rip the zdb functions out of zdb.c
to allow people to play with more flexible things to leverage
zdb's functionality.

No promises on any functions or structs being stable, now or probably
in general unless someone builds a more polished abstraction, the
goal at the moment is to slowly untangle the global state usage
in zdb...

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Rich Ercolani <[email protected]>
Closes #15804 

1 files changed, 68 insertions, 0 deletions

diff --git a/include/libzdb.h b/include/libzdb.h
new file mode 100644
index 000000000..ef910d0a2
--- /dev/null
+++ b/include/libzdb.h
@@ -0,0 +1,68 @@
+#define	ZDB_COMPRESS_NAME(idx) ((idx) < ZIO_COMPRESS_FUNCTIONS ?	\
+	zio_compress_table[(idx)].ci_name : "UNKNOWN")
+#define	ZDB_CHECKSUM_NAME(idx) ((idx) < ZIO_CHECKSUM_FUNCTIONS ?	\
+	zio_checksum_table[(idx)].ci_name : "UNKNOWN")
+#define	ZDB_OT_TYPE(idx) ((idx) < DMU_OT_NUMTYPES ? (idx) :		\
+	(idx) == DMU_OTN_ZAP_DATA || (idx) == DMU_OTN_ZAP_METADATA ?	\
+	DMU_OT_ZAP_OTHER : \
+	(idx) == DMU_OTN_UINT64_DATA || (idx) == DMU_OTN_UINT64_METADATA ? \
+	DMU_OT_UINT64_OTHER : DMU_OT_NUMTYPES)
+
+/* Some platforms require part of inode IDs to be remapped */
+#ifdef __APPLE__
+#define	ZDB_MAP_OBJECT_ID(obj) INO_XNUTOZFS(obj, 2)
+#else
+#define	ZDB_MAP_OBJECT_ID(obj) (obj)
+#endif
+
+#define	ZOR_FLAG_PLAIN_FILE	0x0001
+#define	ZOR_FLAG_DIRECTORY	0x0002
+#define	ZOR_FLAG_SPACE_MAP	0x0004
+#define	ZOR_FLAG_ZAP		0x0008
+#define	ZOR_FLAG_ALL_TYPES	-1
+#define	ZOR_SUPPORTED_FLAGS	(ZOR_FLAG_PLAIN_FILE	| \
+				ZOR_FLAG_DIRECTORY	| \
+				ZOR_FLAG_SPACE_MAP	| \
+				ZOR_FLAG_ZAP)
+
+#define	ZDB_FLAG_CHECKSUM	0x0001
+#define	ZDB_FLAG_DECOMPRESS	0x0002
+#define	ZDB_FLAG_BSWAP		0x0004
+#define	ZDB_FLAG_GBH		0x0008
+#define	ZDB_FLAG_INDIRECT	0x0010
+#define	ZDB_FLAG_RAW		0x0020
+#define	ZDB_FLAG_PRINT_BLKPTR	0x0040
+#define	ZDB_FLAG_VERBOSE	0x0080
+
+
+typedef struct zdb_ctx {
+} zdb_ctx_t;
+
+typedef struct zopt_object_range {
+	uint64_t zor_obj_start;
+	uint64_t zor_obj_end;
+	uint64_t zor_flags;
+} zopt_object_range_t;
+
+
+typedef struct sublivelist_verify {
+	/* FREE's that haven't yet matched to an ALLOC, in one sub-livelist */
+	zfs_btree_t sv_pair;
+
+	/* ALLOC's without a matching FREE, accumulates across sub-livelists */
+	zfs_btree_t sv_leftover;
+} sublivelist_verify_t;
+
+typedef struct sublivelist_verify_block {
+	dva_t svb_dva;
+
+	/*
+	 * We need this to check if the block marked as allocated
+	 * in the livelist was freed (and potentially reallocated)
+	 * in the metaslab spacemaps at a later TXG.
+	 */
+	uint64_t svb_allocated_txg;
+} sublivelist_verify_block_t;
+
+const char *zdb_ot_name(dmu_object_type_t type);
+int livelist_compare(const void *larg, const void *rarg);