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Diffstat (limited to 'src/include/access/toast_internals.h')
-rw-r--r-- | src/include/access/toast_internals.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/include/access/toast_internals.h b/src/include/access/toast_internals.h new file mode 100644 index 0000000..1c28b07 --- /dev/null +++ b/src/include/access/toast_internals.h @@ -0,0 +1,63 @@ +/*------------------------------------------------------------------------- + * + * toast_internals.h + * Internal definitions for the TOAST system. + * + * Copyright (c) 2000-2021, PostgreSQL Global Development Group + * + * src/include/access/toast_internals.h + * + *------------------------------------------------------------------------- + */ +#ifndef TOAST_INTERNALS_H +#define TOAST_INTERNALS_H + +#include "access/toast_compression.h" +#include "storage/lockdefs.h" +#include "utils/relcache.h" +#include "utils/snapshot.h" + +/* + * The information at the start of the compressed toast data. + */ +typedef struct toast_compress_header +{ + int32 vl_len_; /* varlena header (do not touch directly!) */ + uint32 tcinfo; /* 2 bits for compression method and 30 bits + * external size; see va_extinfo */ +} toast_compress_header; + +/* + * Utilities for manipulation of header information for compressed + * toast entries. + */ +#define TOAST_COMPRESS_EXTSIZE(ptr) \ + (((toast_compress_header *) (ptr))->tcinfo & VARLENA_EXTSIZE_MASK) +#define TOAST_COMPRESS_METHOD(ptr) \ + (((toast_compress_header *) (ptr))->tcinfo >> VARLENA_EXTSIZE_BITS) + +#define TOAST_COMPRESS_SET_SIZE_AND_COMPRESS_METHOD(ptr, len, cm_method) \ + do { \ + Assert((len) > 0 && (len) <= VARLENA_EXTSIZE_MASK); \ + Assert((cm_method) == TOAST_PGLZ_COMPRESSION_ID || \ + (cm_method) == TOAST_LZ4_COMPRESSION_ID); \ + ((toast_compress_header *) (ptr))->tcinfo = \ + (len) | ((uint32) (cm_method) << VARLENA_EXTSIZE_BITS); \ + } while (0) + +extern Datum toast_compress_datum(Datum value, char cmethod); +extern Oid toast_get_valid_index(Oid toastoid, LOCKMODE lock); + +extern void toast_delete_datum(Relation rel, Datum value, bool is_speculative); +extern Datum toast_save_datum(Relation rel, Datum value, + struct varlena *oldexternal, int options); + +extern int toast_open_indexes(Relation toastrel, + LOCKMODE lock, + Relation **toastidxs, + int *num_indexes); +extern void toast_close_indexes(Relation *toastidxs, int num_indexes, + LOCKMODE lock); +extern void init_toast_snapshot(Snapshot toast_snapshot); + +#endif /* TOAST_INTERNALS_H */ |