Attached is a first draft of an update to pg_filedump for 9.3. I know
pg_filedump is a pgfoundry project, but that seems like it's just there
to host the download; so please excuse the slightly off-topic post here
on -hackers.
I made a few changes to support 9.3, which were mostly fixes related two
things:
* new htup_details.h and changes related to FK concurrency improvements
* XLogRecPtr is now a uint64
And, of course, I added support for checksums. They are always displayed
and calculated, but it only throws an error if you pass "-k". Only the
user knows whether checksums are enabled, because we removed page-level
bits indicating the presence of a checksum.
The patch is a bit ugly: I had to copy some code, and copy the entire
checksum.c file (minus some Asserts, which don't work in an external
program). Suggestions welcome.
Regards,
Jeff Davis
diff -Nc pg_filedump-9.2.0/checksum.c pg_filedump-9.3.0j/checksum.c
*** pg_filedump-9.2.0/checksum.c 1969-12-31 16:00:00.000000000 -0800
--- pg_filedump-9.3.0j/checksum.c 2013-06-09 21:20:34.036176831 -0700
***************
*** 0 ****
--- 1,157 ----
+ /*-------------------------------------------------------------------------
+ *
+ * checksum.c
+ * Checksum implementation for data pages.
+ *
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ * src/backend/storage/page/checksum.c
+ *
+ *-------------------------------------------------------------------------
+ *
+ * Checksum algorithm
+ *
+ * The algorithm used to checksum pages is chosen for very fast calculation.
+ * Workloads where the database working set fits into OS file cache but not
+ * into shared buffers can read in pages at a very fast pace and the checksum
+ * algorithm itself can become the largest bottleneck.
+ *
+ * The checksum algorithm itself is based on the FNV-1a hash (FNV is shorthand
+ * for Fowler/Noll/Vo) The primitive of a plain FNV-1a hash folds in data 1
+ * byte at a time according to the formula:
+ *
+ * hash = (hash ^ value) * FNV_PRIME
+ *
+ * FNV-1a algorithm is described at http://www.isthe.com/chongo/tech/comp/fnv/
+ *
+ * PostgreSQL doesn't use FNV-1a hash directly because it has bad mixing of
+ * high bits - high order bits in input data only affect high order bits in
+ * output data. To resolve this we xor in the value prior to multiplication
+ * shifted right by 17 bits. The number 17 was chosen because it doesn't
+ * have common denominator with set bit positions in FNV_PRIME and empirically
+ * provides the fastest mixing for high order bits of final iterations quickly
+ * avalanche into lower positions. For performance reasons we choose to combine
+ * 4 bytes at a time. The actual hash formula used as the basis is:
+ *
+ * hash = (hash ^ value) * FNV_PRIME ^ ((hash ^ value) >> 17)
+ *
+ * The main bottleneck in this calculation is the multiplication latency. To
+ * hide the latency and to make use of SIMD parallelism multiple hash values
+ * are calculated in parallel. The page is treated as a 32 column two
+ * dimensional array of 32 bit values. Each column is aggregated separately
+ * into a partial checksum. Each partial checksum uses a different initial
+ * value (offset basis in FNV terminology). The initial values actually used
+ * were chosen randomly, as the values themselves don't matter as much as that
+ * they are different and don't match anything in real data. After initializing
+ * partial checksums each value in the column is aggregated according to the
+ * above formula. Finally two more iterations of the formula are performed with
+ * value 0 to mix the bits of the last value added.
+ *
+ * The partial checksums are then folded together using xor to form a single
+ * 32-bit checksum. The caller can safely reduce the value to 16 bits
+ * using modulo 2^16-1. That will cause a very slight bias towards lower
+ * values but this is not significant for the performance of the
+ * checksum.
+ *
+ * The algorithm choice was based on what instructions are available in SIMD
+ * instruction sets. This meant that a fast and good algorithm needed to use
+ * multiplication as the main mixing operator. The simplest multiplication
+ * based checksum primitive is the one used by FNV. The prime used is chosen
+ * for good dispersion of values. It has no known simple patterns that result
+ * in collisions. Test of 5-bit differentials of the primitive over 64bit keys
+ * reveals no differentials with 3 or more values out of 100000 random keys
+ * colliding. Avalanche test shows that only high order bits of the last word
+ * have a bias. Tests of 1-4 uncorrelated bit errors, stray 0 and 0xFF bytes,
+ * overwriting page from random position to end with 0 bytes, and overwriting
+ * random segments of page with 0x00, 0xFF and random data all show optimal
+ * 2e-16 false positive rate within margin of error.
+ *
+ * Vectorization of the algorithm requires 32bit x 32bit -> 32bit integer
+ * multiplication instruction. As of 2013 the corresponding instruction is
+ * available on x86 SSE4.1 extensions (pmulld) and ARM NEON (vmul.i32).
+ * Vectorization requires a compiler to do the vectorization for us. For recent
+ * GCC versions the flags -msse4.1 -funroll-loops -ftree-vectorize are enough
+ * to achieve vectorization.
+ *
+ * The optimal amount of parallelism to use depends on CPU specific instruction
+ * latency, SIMD instruction width, throughput and the amount of registers
+ * available to hold intermediate state. Generally, more parallelism is better
+ * up to the point that state doesn't fit in registers and extra load-store
+ * instructions are needed to swap values in/out. The number chosen is a fixed
+ * part of the algorithm because changing the parallelism changes the checksum
+ * result.
+ *
+ * The parallelism number 32 was chosen based on the fact that it is the
+ * largest state that fits into architecturally visible x86 SSE registers while
+ * leaving some free registers for intermediate values. For future processors
+ * with 256bit vector registers this will leave some performance on the table.
+ * When vectorization is not available it might be beneficial to restructure
+ * the computation to calculate a subset of the columns at a time and perform
+ * multiple passes to avoid register spilling. This optimization opportunity
+ * is not used. Current coding also assumes that the compiler has the ability
+ * to unroll the inner loop to avoid loop overhead and minimize register
+ * spilling. For less sophisticated compilers it might be beneficial to manually
+ * unroll the inner loop.
+ */
+ #include "postgres.h"
+
+ #include "storage/checksum.h"
+
+ /* number of checksums to calculate in parallel */
+ #define N_SUMS 32
+ /* prime multiplier of FNV-1a hash */
+ #define FNV_PRIME 16777619
+
+ /*
+ * Base offsets to initialize each of the parallel FNV hashes into a
+ * different initial state.
+ */
+ static const uint32 checksumBaseOffsets[N_SUMS] = {
+ 0x5B1F36E9, 0xB8525960, 0x02AB50AA, 0x1DE66D2A,
+ 0x79FF467A, 0x9BB9F8A3, 0x217E7CD2, 0x83E13D2C,
+ 0xF8D4474F, 0xE39EB970, 0x42C6AE16, 0x993216FA,
+ 0x7B093B5D, 0x98DAFF3C, 0xF718902A, 0x0B1C9CDB,
+ 0xE58F764B, 0x187636BC, 0x5D7B3BB1, 0xE73DE7DE,
+ 0x92BEC979, 0xCCA6C0B2, 0x304A0979, 0x85AA43D4,
+ 0x783125BB, 0x6CA8EAA2, 0xE407EAC6, 0x4B5CFC3E,
+ 0x9FBF8C76, 0x15CA20BE, 0xF2CA9FD3, 0x959BD756
+ };
+
+ /*
+ * Calculate one round of the checksum.
+ */
+ #define CHECKSUM_COMP(checksum, value) do {\
+ uint32 __tmp = (checksum) ^ (value);\
+ (checksum) = __tmp * FNV_PRIME ^ (__tmp >> 17);\
+ } while (0)
+
+ uint32
+ checksum_block(char *data, uint32 size)
+ {
+ uint32 sums[N_SUMS];
+ uint32 (*dataArr)[N_SUMS] = (uint32 (*)[N_SUMS]) data;
+ uint32 result = 0;
+ int i, j;
+
+ /* initialize partial checksums to their corresponding offsets */
+ memcpy(sums, checksumBaseOffsets, sizeof(checksumBaseOffsets));
+
+ /* main checksum calculation */
+ for (i = 0; i < size/sizeof(uint32)/N_SUMS; i++)
+ for (j = 0; j < N_SUMS; j++)
+ CHECKSUM_COMP(sums[j], dataArr[i][j]);
+
+ /* finally add in two rounds of zeroes for additional mixing */
+ for (i = 0; i < 2; i++)
+ for (j = 0; j < N_SUMS; j++)
+ CHECKSUM_COMP(sums[j], 0);
+
+ /* xor fold partial checksums together */
+ for (i = 0; i < N_SUMS; i++)
+ result ^= sums[i];
+
+ return result;
+ }
Common subdirectories: pg_filedump-9.2.0/.deps and pg_filedump-9.3.0j/.deps
diff -Nc pg_filedump-9.2.0/Makefile pg_filedump-9.3.0j/Makefile
*** pg_filedump-9.2.0/Makefile 2012-03-12 09:02:44.000000000 -0700
--- pg_filedump-9.3.0j/Makefile 2013-06-09 21:15:43.908182347 -0700
***************
*** 1,7 ****
# View README.pg_filedump first
# note this must match version macros in pg_filedump.h
! FD_VERSION=9.2.0
CC=gcc
CFLAGS=-g -O -Wall -Wmissing-prototypes -Wmissing-declarations
--- 1,7 ----
# View README.pg_filedump first
# note this must match version macros in pg_filedump.h
! FD_VERSION=9.3.0
CC=gcc
CFLAGS=-g -O -Wall -Wmissing-prototypes -Wmissing-declarations
***************
*** 17,28 ****
all: pg_filedump
! pg_filedump: pg_filedump.o
${CC} ${CFLAGS} -o pg_filedump pg_filedump.o
pg_filedump.o: pg_filedump.c
${CC} ${CFLAGS} -I${PGSQL_INCLUDE_DIR} pg_filedump.c -c
dist:
rm -rf pg_filedump-${FD_VERSION} pg_filedump-${FD_VERSION}.tar.gz
mkdir pg_filedump-${FD_VERSION}
--- 17,31 ----
all: pg_filedump
! pg_filedump: pg_filedump.o checksum.o
${CC} ${CFLAGS} -o pg_filedump pg_filedump.o
pg_filedump.o: pg_filedump.c
${CC} ${CFLAGS} -I${PGSQL_INCLUDE_DIR} pg_filedump.c -c
+ checksum.o: checksum.c
+ ${CC} ${CFLAGS} -I${PGSQL_INCLUDE_DIR} checksum.c -c
+
dist:
rm -rf pg_filedump-${FD_VERSION} pg_filedump-${FD_VERSION}.tar.gz
mkdir pg_filedump-${FD_VERSION}
diff -Nc pg_filedump-9.2.0/Makefile.contrib pg_filedump-9.3.0j/Makefile.contrib
*** pg_filedump-9.2.0/Makefile.contrib 2012-03-12 08:52:57.000000000 -0700
--- pg_filedump-9.3.0j/Makefile.contrib 2013-06-09 21:16:17.524181706 -0700
***************
*** 1,5 ****
PROGRAM = pg_filedump
! OBJS = pg_filedump.o
DOCS = README.pg_filedump
--- 1,5 ----
PROGRAM = pg_filedump
! OBJS = pg_filedump.o checksum.o
DOCS = README.pg_filedump
diff -Nc pg_filedump-9.2.0/pg_filedump.c pg_filedump-9.3.0j/pg_filedump.c
*** pg_filedump-9.2.0/pg_filedump.c 2012-03-12 08:58:31.000000000 -0700
--- pg_filedump-9.3.0j/pg_filedump.c 2013-06-09 21:46:21.240147414 -0700
***************
*** 40,51 ****
static void DisplayOptions (unsigned int validOptions);
static unsigned int ConsumeOptions (int numOptions, char **options);
static int GetOptionValue (char *optionString);
! static void FormatBlock ();
static unsigned int GetBlockSize ();
static unsigned int GetSpecialSectionType (Page page);
static bool IsBtreeMetaPage(Page page);
static void CreateDumpFileHeader (int numOptions, char **options);
! static int FormatHeader (Page page);
static void FormatItemBlock (Page page);
static void FormatItem (unsigned int numBytes, unsigned int startIndex,
unsigned int formatAs);
--- 40,51 ----
static void DisplayOptions (unsigned int validOptions);
static unsigned int ConsumeOptions (int numOptions, char **options);
static int GetOptionValue (char *optionString);
! static void FormatBlock (BlockNumber blkno);
static unsigned int GetBlockSize ();
static unsigned int GetSpecialSectionType (Page page);
static bool IsBtreeMetaPage(Page page);
static void CreateDumpFileHeader (int numOptions, char **options);
! static int FormatHeader (Page page, BlockNumber blkno);
static void FormatItemBlock (Page page);
static void FormatItem (unsigned int numBytes, unsigned int startIndex,
unsigned int formatAs);
***************
*** 54,60 ****
static void FormatBinary (unsigned int numBytes, unsigned int startIndex);
static void DumpBinaryBlock ();
static void DumpFileContents ();
!
// Send properly formed usage information to the user.
static void
--- 54,60 ----
static void FormatBinary (unsigned int numBytes, unsigned int startIndex);
static void DumpBinaryBlock ();
static void DumpFileContents ();
! static uint16 PageCalcChecksum16 (Page page, BlockNumber blkno);
// Send properly formed usage information to the user.
static void
***************
*** 288,293 ****
--- 288,298 ----
SET_OPTION (itemOptions, ITEM_DETAIL, 'i');
break;
+ // Verify block checksums
+ case 'k':
+ SET_OPTION (blockOptions, BLOCK_CHECKSUMS, 'k');
+ break;
+
// Interpret items as standard index values
case 'x':
SET_OPTION (itemOptions, ITEM_INDEX, 'x');
***************
*** 522,527 ****
--- 527,561 ----
return false;
}
+ static uint16
+ PageCalcChecksum16(Page page, BlockNumber blkno)
+ {
+ PageHeader phdr = (PageHeader) page;
+ uint16 save_checksum;
+ uint32 checksum;
+
+ /*
+ * Save pd_checksum and set it to zero, so that the checksum calculation
+ * isn't affected by the checksum stored on the page. We do this to
+ * allow optimization of the checksum calculation on the whole block
+ * in one go.
+ */
+ save_checksum = phdr->pd_checksum;
+ phdr->pd_checksum = 0;
+ checksum = checksum_block(page, BLCKSZ);
+ phdr->pd_checksum = save_checksum;
+
+ /* mix in the block number to detect transposed pages */
+ checksum ^= blkno;
+
+ /*
+ * Reduce to a uint16 (to fit in the pd_checksum field) with an offset of
+ * one. That avoids checksums of zero, which seems like a good idea.
+ */
+ return (checksum % 65535) + 1;
+ }
+
+
// Display a header for the dump so we know the file name, the options
// used and the time the dump was taken
static void
***************
*** 555,561 ****
// Dump out a formatted block header for the requested block
static int
! FormatHeader (Page page)
{
int rc = 0;
unsigned int headerBytes;
--- 589,595 ----
// Dump out a formatted block header for the requested block
static int
! FormatHeader (Page page, BlockNumber blkno)
{
int rc = 0;
unsigned int headerBytes;
***************
*** 609,623 ****
" Block: Size %4d Version %4u Upper %4u (0x%04hx)\n"
" LSN: logid %6d recoff 0x%08x Special %4u (0x%04hx)\n"
" Items: %4d Free Space: %4u\n"
! " TLI: 0x%04x Prune XID: 0x%08x Flags: 0x%04x (%s)\n"
" Length (including item array): %u\n\n",
pageOffset, pageHeader->pd_lower, pageHeader->pd_lower,
(int) PageGetPageSize (page), blockVersion,
pageHeader->pd_upper, pageHeader->pd_upper,
! pageLSN.xlogid, pageLSN.xrecoff,
pageHeader->pd_special, pageHeader->pd_special,
maxOffset, pageHeader->pd_upper - pageHeader->pd_lower,
! pageHeader->pd_tli, pageHeader->pd_prune_xid,
pageHeader->pd_flags, flagString,
headerBytes);
--- 643,657 ----
" Block: Size %4d Version %4u Upper %4u (0x%04hx)\n"
" LSN: logid %6d recoff 0x%08x Special %4u (0x%04hx)\n"
" Items: %4d Free Space: %4u\n"
! " Checksum: %05hu Prune XID: 0x%08x Flags: 0x%04x (%s)\n"
" Length (including item array): %u\n\n",
pageOffset, pageHeader->pd_lower, pageHeader->pd_lower,
(int) PageGetPageSize (page), blockVersion,
pageHeader->pd_upper, pageHeader->pd_upper,
! (uint32) (pageLSN >> 32), (uint32) pageLSN,
pageHeader->pd_special, pageHeader->pd_special,
maxOffset, pageHeader->pd_upper - pageHeader->pd_lower,
! pageHeader->pd_checksum, pageHeader->pd_prune_xid,
pageHeader->pd_flags, flagString,
headerBytes);
***************
*** 647,652 ****
--- 681,694 ----
|| (pageHeader->pd_upper < pageHeader->pd_lower)
|| (pageHeader->pd_special > blockSize))
printf (" Error: Invalid header information.\n\n");
+
+ if (blockOptions & BLOCK_CHECKSUMS)
+ {
+ uint16 calc_checksum = PageCalcChecksum16(page, blkno);
+ if (calc_checksum != pageHeader->pd_checksum)
+ printf(" Error: checksum failure: calculated %05hu.\n\n",
+ calc_checksum);
+ }
}
// If we have reached the end of file while interpreting the header, let
***************
*** 933,939 ****
printf (" XMIN: %u XMAX: %u CID|XVAC: %u",
HeapTupleHeaderGetXmin(htup),
! HeapTupleHeaderGetXmax(htup),
HeapTupleHeaderGetRawCommandId(htup));
if (infoMask & HEAP_HASOID)
--- 975,981 ----
printf (" XMIN: %u XMAX: %u CID|XVAC: %u",
HeapTupleHeaderGetXmin(htup),
! HeapTupleHeaderGetRawXmax(htup),
HeapTupleHeaderGetRawCommandId(htup));
if (infoMask & HEAP_HASOID)
***************
*** 958,969 ****
strcat (flagString, "HASEXTERNAL|");
if (infoMask & HEAP_HASOID)
strcat (flagString, "HASOID|");
if (infoMask & HEAP_COMBOCID)
strcat (flagString, "COMBOCID|");
if (infoMask & HEAP_XMAX_EXCL_LOCK)
strcat (flagString, "XMAX_EXCL_LOCK|");
! if (infoMask & HEAP_XMAX_SHARED_LOCK)
! strcat (flagString, "XMAX_SHARED_LOCK|");
if (infoMask & HEAP_XMIN_COMMITTED)
strcat (flagString, "XMIN_COMMITTED|");
if (infoMask & HEAP_XMIN_INVALID)
--- 1000,1015 ----
strcat (flagString, "HASEXTERNAL|");
if (infoMask & HEAP_HASOID)
strcat (flagString, "HASOID|");
+ if (infoMask & HEAP_XMAX_KEYSHR_LOCK)
+ strcat (flagString, "XMAX_KEYSHR_LOCK|");
if (infoMask & HEAP_COMBOCID)
strcat (flagString, "COMBOCID|");
if (infoMask & HEAP_XMAX_EXCL_LOCK)
strcat (flagString, "XMAX_EXCL_LOCK|");
! if (infoMask & HEAP_XMAX_SHR_LOCK)
! strcat (flagString, "XMAX_SHR_LOCK|");
! if (infoMask & HEAP_XMAX_LOCK_ONLY)
! strcat (flagString, "XMAX_LOCK_ONLY|");
if (infoMask & HEAP_XMIN_COMMITTED)
strcat (flagString, "XMIN_COMMITTED|");
if (infoMask & HEAP_XMIN_INVALID)
***************
*** 981,986 ****
--- 1027,1034 ----
if (infoMask & HEAP_MOVED_IN)
strcat (flagString, "MOVED_IN|");
+ if (infoMask2 & HEAP_KEYS_UPDATED)
+ strcat (flagString, "KEYS_UPDATED|");
if (infoMask2 & HEAP_HOT_UPDATED)
strcat (flagString, "HOT_UPDATED|");
if (infoMask2 & HEAP_ONLY_TUPLE)
***************
*** 1204,1210 ****
// For each block, dump out formatted header and content information
static void
! FormatBlock ()
{
Page page = (Page) buffer;
pageOffset = blockSize * currentBlock;
--- 1252,1258 ----
// For each block, dump out formatted header and content information
static void
! FormatBlock (BlockNumber blkno)
{
Page page = (Page) buffer;
pageOffset = blockSize * currentBlock;
***************
*** 1224,1230 ****
int rc;
// Every block contains a header, items and possibly a special
// section. Beware of partial block reads though
! rc = FormatHeader (page);
// If we didn't encounter a partial read in the header, carry on...
if (rc != EOF_ENCOUNTERED)
--- 1272,1278 ----
int rc;
// Every block contains a header, items and possibly a special
// section. Beware of partial block reads though
! rc = FormatHeader (page, blkno);
// If we didn't encounter a partial read in the header, carry on...
if (rc != EOF_ENCOUNTERED)
***************
*** 1340,1354 ****
controlData->system_identifier,
dbState,
ctime (&(cd_time)),
! controlData->checkPoint.xlogid, controlData->checkPoint.xrecoff,
! controlData->prevCheckPoint.xlogid, controlData->prevCheckPoint.xrecoff,
! checkPoint->redo.xlogid, checkPoint->redo.xrecoff,
checkPoint->ThisTimeLineID,
checkPoint->nextXidEpoch, checkPoint->nextXid,
checkPoint->nextOid,
checkPoint->nextMulti, checkPoint->nextMultiOffset,
ctime (&cp_time),
! controlData->minRecoveryPoint.xlogid, controlData->minRecoveryPoint.xrecoff,
controlData->maxAlign,
controlData->floatFormat,
(controlData->floatFormat == FLOATFORMAT_VALUE ?
--- 1388,1402 ----
controlData->system_identifier,
dbState,
ctime (&(cd_time)),
! (uint32) (controlData->checkPoint >> 32), (uint32) controlData->checkPoint,
! (uint32) (controlData->prevCheckPoint >> 32), (uint32) controlData->prevCheckPoint,
! (uint32) (checkPoint->redo >> 32), (uint32) checkPoint->redo,
checkPoint->ThisTimeLineID,
checkPoint->nextXidEpoch, checkPoint->nextXid,
checkPoint->nextOid,
checkPoint->nextMulti, checkPoint->nextMultiOffset,
ctime (&cp_time),
! (uint32) (controlData->minRecoveryPoint), (uint32) (controlData->minRecoveryPoint),
controlData->maxAlign,
controlData->floatFormat,
(controlData->floatFormat == FLOATFORMAT_VALUE ?
***************
*** 1494,1500 ****
contentsToDump = false;
}
else
! FormatBlock ();
}
}
--- 1542,1548 ----
contentsToDump = false;
}
else
! FormatBlock (currentBlock);
}
}
diff -Nc pg_filedump-9.2.0/pg_filedump.h pg_filedump-9.3.0j/pg_filedump.h
*** pg_filedump-9.2.0/pg_filedump.h 2012-03-12 08:58:23.000000000 -0700
--- pg_filedump-9.3.0j/pg_filedump.h 2013-06-09 21:28:26.944167838 -0700
***************
*** 22,29 ****
* Original Author: Patrick Macdonald <patri...@redhat.com>
*/
! #define FD_VERSION "9.2.0" /* version ID of pg_filedump */
! #define FD_PG_VERSION "PostgreSQL 9.2.x" /* PG version it works with */
#include "postgres.h"
--- 22,29 ----
* Original Author: Patrick Macdonald <patri...@redhat.com>
*/
! #define FD_VERSION "9.3.0" /* version ID of pg_filedump */
! #define FD_PG_VERSION "PostgreSQL 9.3.x" /* PG version it works with */
#include "postgres.h"
***************
*** 34,44 ****
--- 34,46 ----
#include "access/gist.h"
#include "access/hash.h"
#include "access/htup.h"
+ #include "access/htup_details.h"
#include "access/itup.h"
#include "access/nbtree.h"
#include "access/spgist_private.h"
#include "catalog/pg_control.h"
#include "storage/bufpage.h"
+ #include "storage/checksum.h"
// Options for Block formatting operations
static unsigned int blockOptions = 0;
***************
*** 49,55 ****
BLOCK_FORMAT = 0x00000004, // -f: Formatted dump of blocks / control file
BLOCK_FORCED = 0x00000008, // -S: Block size forced
BLOCK_NO_INTR = 0x00000010, // -d: Dump straight blocks
! BLOCK_RANGE = 0x00000020 // -R: Specific block range to dump
}
blockSwitches;
--- 51,58 ----
BLOCK_FORMAT = 0x00000004, // -f: Formatted dump of blocks / control file
BLOCK_FORCED = 0x00000008, // -S: Block size forced
BLOCK_NO_INTR = 0x00000010, // -d: Dump straight blocks
! BLOCK_RANGE = 0x00000020, // -R: Specific block range to dump
! BLOCK_CHECKSUMS = 0x00000040 // -k: verify block checksums
}
blockSwitches;
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