diff options
Diffstat (limited to 'src/include/access/xlog.h')
| -rw-r--r-- | src/include/access/xlog.h | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/src/include/access/xlog.h b/src/include/access/xlog.h index 1b31414060d..86ab3276caf 100644 --- a/src/include/access/xlog.h +++ b/src/include/access/xlog.h @@ -29,7 +29,7 @@ * backup block data * ... * - * where there can be zero to three backup blocks (as signaled by xl_info flag + * where there can be zero to four backup blocks (as signaled by xl_info flag * bits). XLogRecord structs always start on MAXALIGN boundaries in the WAL * files, and we round up SizeOfXLogRecord so that the rmgr data is also * guaranteed to begin on a MAXALIGN boundary. However, no padding is added @@ -66,24 +66,16 @@ typedef struct XLogRecord /* * If we backed up any disk blocks with the XLOG record, we use flag bits in - * xl_info to signal it. We support backup of up to 3 disk blocks per XLOG + * xl_info to signal it. We support backup of up to 4 disk blocks per XLOG * record. */ -#define XLR_BKP_BLOCK_MASK 0x0E /* all info bits used for bkp blocks */ -#define XLR_MAX_BKP_BLOCKS 3 +#define XLR_BKP_BLOCK_MASK 0x0F /* all info bits used for bkp blocks */ +#define XLR_MAX_BKP_BLOCKS 4 #define XLR_SET_BKP_BLOCK(iblk) (0x08 >> (iblk)) #define XLR_BKP_BLOCK_1 XLR_SET_BKP_BLOCK(0) /* 0x08 */ #define XLR_BKP_BLOCK_2 XLR_SET_BKP_BLOCK(1) /* 0x04 */ #define XLR_BKP_BLOCK_3 XLR_SET_BKP_BLOCK(2) /* 0x02 */ - -/* - * Bit 0 of xl_info is set if the backed-up blocks could safely be removed - * from a compressed version of XLOG (that is, they are backed up only to - * prevent partial-page-write problems, and not to ensure consistency of PITR - * recovery). The compression algorithm would need to extract data from the - * blocks to create an equivalent non-full-page XLOG record. - */ -#define XLR_BKP_REMOVABLE 0x01 +#define XLR_BKP_BLOCK_4 XLR_SET_BKP_BLOCK(3) /* 0x01 */ /* Sync methods */ #define SYNC_METHOD_FSYNC 0 |