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Add API for 64-bit large object access. Now users can access up to

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4TB large objects (standard 8KB BLCKSZ case).  For this purpose new
libpq API lo_lseek64, lo_tell64 and lo_truncate64 are added.  Also
corresponding new backend functions lo_lseek64, lo_tell64 and
lo_truncate64 are added. inv_api.c is changed to handle 64-bit
offsets.

Patch contributed by Nozomi Anzai (backend side) and Yugo Nagata
(frontend side, docs, regression tests and example program). Reviewed
by Kohei Kaigai. Committed by Tatsuo Ishii with minor editings.
This commit is contained in:
Tatsuo Ishii
2012-10-07 08:36:48 +09:00
parent ae835c7d6e
commit 461ef73f09
16 changed files with 856 additions and 32 deletions
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6
src/include/catalog/pg_proc.h
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@@ -1040,14 +1040,20 @@ DATA(insert OID = 955 ( lowrite PGNSP PGUID 12 1 0 0 0 f f f f t f v 2 0 23
DESCR("large object write");
DATA(insert OID = 956 ( lo_lseek PGNSP PGUID 12 1 0 0 0 f f f f t f v 3 0 23 "23 23 23" _null_ _null_ _null_ _null_ lo_lseek _null_ _null_ _null_ ));
DESCR("large object seek");
DATA(insert OID = 3170 ( lo_lseek64 PGNSP PGUID 12 1 0 0 0 f f f f t f v 3 0 20 "23 20 23" _null_ _null_ _null_ _null_ lo_lseek64 _null_ _null_ _null_ ));
DESCR("large object seek (64 bit)");
DATA(insert OID = 957 ( lo_creat PGNSP PGUID 12 1 0 0 0 f f f f t f v 1 0 26 "23" _null_ _null_ _null_ _null_ lo_creat _null_ _null_ _null_ ));
DESCR("large object create");
DATA(insert OID = 715 ( lo_create PGNSP PGUID 12 1 0 0 0 f f f f t f v 1 0 26 "26" _null_ _null_ _null_ _null_ lo_create _null_ _null_ _null_ ));
DESCR("large object create");
DATA(insert OID = 958 ( lo_tell PGNSP PGUID 12 1 0 0 0 f f f f t f v 1 0 23 "23" _null_ _null_ _null_ _null_ lo_tell _null_ _null_ _null_ ));
DESCR("large object position");
DATA(insert OID = 3171 ( lo_tell64 PGNSP PGUID 12 1 0 0 0 f f f f t f v 1 0 20 "23" _null_ _null_ _null_ _null_ lo_tell64 _null_ _null_ _null_ ));
DESCR("large object position (64 bit)");
DATA(insert OID = 1004 ( lo_truncate PGNSP PGUID 12 1 0 0 0 f f f f t f v 2 0 23 "23 23" _null_ _null_ _null_ _null_ lo_truncate _null_ _null_ _null_ ));
DESCR("truncate large object");
DATA(insert OID = 3172 ( lo_truncate64 PGNSP PGUID 12 1 0 0 0 f f f f t f v 2 0 23 "23 20" _null_ _null_ _null_ _null_ lo_truncate64 _null_ _null_ _null_ ));
DESCR("truncate large object (64 bit)");
DATA(insert OID = 959 ( on_pl PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 16 "600 628" _null_ _null_ _null_ _null_ on_pl _null_ _null_ _null_ ));
DATA(insert OID = 960 ( on_sl PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 16 "601 628" _null_ _null_ _null_ _null_ on_sl _null_ _null_ _null_ ));

3
src/include/libpq/be-fsstubs.h
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@@ -34,8 +34,11 @@ extern Datum lowrite(PG_FUNCTION_ARGS);
extern Datum lo_lseek(PG_FUNCTION_ARGS);
extern Datum lo_tell(PG_FUNCTION_ARGS);
extern Datum lo_lseek64(PG_FUNCTION_ARGS);
extern Datum lo_tell64(PG_FUNCTION_ARGS);
extern Datum lo_unlink(PG_FUNCTION_ARGS);
extern Datum lo_truncate(PG_FUNCTION_ARGS);
extern Datum lo_truncate64(PG_FUNCTION_ARGS);
/*
* compatibility option for access control

5
src/include/postgres_ext.h
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@@ -56,4 +56,9 @@ typedef unsigned int Oid;
#define PG_DIAG_SOURCE_LINE 'L'
#define PG_DIAG_SOURCE_FUNCTION 'R'
#ifndef NO_PG_INT64
#define HAVE_PG_INT64 1
typedef long long int pg_int64;
#endif
#endif

13
src/include/storage/large_object.h
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@@ -37,7 +37,7 @@ typedef struct LargeObjectDesc
Oid id; /* LO's identifier */
Snapshot snapshot; /* snapshot to use */
SubTransactionId subid; /* owning subtransaction ID */
uint32 offset; /* current seek pointer */
uint64 offset; /* current seek pointer */
int flags; /* locking info, etc */
/* flag bits: */
@@ -62,7 +62,10 @@ typedef struct LargeObjectDesc
* This avoids unnecessary tuple updates caused by partial-page writes.
*/
#define LOBLKSIZE (BLCKSZ / 4)
/*
* Maximum byte length for each large object
*/
#define MAX_LARGE_OBJECT_SIZE INT64CONST(INT_MAX * LOBLKSIZE)
/*
* Function definitions...
@@ -74,10 +77,10 @@ extern Oid inv_create(Oid lobjId);
extern LargeObjectDesc *inv_open(Oid lobjId, int flags, MemoryContext mcxt);
extern void inv_close(LargeObjectDesc *obj_desc);
extern int inv_drop(Oid lobjId);
extern int inv_seek(LargeObjectDesc *obj_desc, int offset, int whence);
extern int inv_tell(LargeObjectDesc *obj_desc);
extern int64 inv_seek(LargeObjectDesc *obj_desc, int64 offset, int whence);
extern int64 inv_tell(LargeObjectDesc *obj_desc);
extern int inv_read(LargeObjectDesc *obj_desc, char *buf, int nbytes);
extern int inv_write(LargeObjectDesc *obj_desc, const char *buf, int nbytes);
extern void inv_truncate(LargeObjectDesc *obj_desc, int len);
extern void inv_truncate(LargeObjectDesc *obj_desc, int64 len);
#endif /* LARGE_OBJECT_H */