database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-24 01:29:19 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

13
src/include/storage/large_object.h
View File

@@ -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 */