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OpenZFS 8067 - zdb should be able to dump literal embedded block pointer

Browse Source 
Authored by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Alex Reece <alex@delphix.com>
Reviewed by: Yuri Pankov <yuri.pankov@gmail.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Giuseppe Di Natale <dinatale2@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/8067
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/8173085
Closes #6319
This commit is contained in:
Matthew Ahrens 2017-05-01 11:06:07 -07:00 committed by Brian Behlendorf
parent c34efbebd5
commit a896468c78
4 changed files with 95 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
cmd/zdb/zdb.c
View File

@ -63,6 +63,7 @@
#include <sys/ddt.h>
#include <sys/zfeature.h>
#include <sys/abd.h>
#include <sys/blkptr.h>
#include <zfs_comutil.h>
#include <libzfs.h>
@ -137,10 +138,11 @@ usage(void)
"\t%s -O <dataset> <path>\n"
"\t%s -R [-A] [-e [-V] [-p <path> ...]] [-U <cache>]\n"
"\t\t<poolname> <vdev>:<offset>:<size>[:<flags>]\n"
"\t%s -E [-A] word0:word1:...:word15\n"
"\t%s -S [-AP] [-e [-V] [-p <path> ...]] [-U <cache>] "
"<poolname>\n\n",
cmdname, cmdname, cmdname, cmdname, cmdname, cmdname, cmdname,
cmdname);
cmdname, cmdname);
(void) fprintf(stderr, " Dataset name must include at least one "
"separator character '/' or '@'\n");
@ -155,6 +157,8 @@ usage(void)
(void) fprintf(stderr, " -C config (or cachefile if alone)\n");
(void) fprintf(stderr, " -d dataset(s)\n");
(void) fprintf(stderr, " -D dedup statistics\n");
(void) fprintf(stderr, " -E decode and display block from an "
"embedded block pointer\n");
(void) fprintf(stderr, " -h pool history\n");
(void) fprintf(stderr, " -i intent logs\n");
(void) fprintf(stderr, " -l read label contents\n");
@ -4092,6 +4096,35 @@ out:
free(dup);
}
static void
zdb_embedded_block(char *thing)
{
blkptr_t bp;
unsigned long long *words = (void *)&bp;
char buf[SPA_MAXBLOCKSIZE];
int err;
memset(&bp, 0, sizeof (blkptr_t));
err = sscanf(thing, "%llx:%llx:%llx:%llx:%llx:%llx:%llx:%llx:"
"%llx:%llx:%llx:%llx:%llx:%llx:%llx:%llx",
words + 0, words + 1, words + 2, words + 3,
words + 4, words + 5, words + 6, words + 7,
words + 8, words + 9, words + 10, words + 11,
words + 12, words + 13, words + 14, words + 15);
if (err != 16) {
(void) printf("invalid input format\n");
exit(1);
}
ASSERT3U(BPE_GET_LSIZE(&bp), <=, SPA_MAXBLOCKSIZE);
err = decode_embedded_bp(&bp, buf, BPE_GET_LSIZE(&bp));
if (err != 0) {
(void) printf("decode failed: %u\n", err);
exit(1);
}
zdb_dump_block_raw(buf, BPE_GET_LSIZE(&bp), 0);
}
static boolean_t
pool_match(nvlist_t *cfg, char *tgt)
{
@ -4210,13 +4243,14 @@ main(int argc, char **argv)
spa_config_path = spa_config_path_env;
while ((c = getopt(argc, argv,
"AbcCdDeFGhiI:lLmMo:Op:PqRsSt:uU:vVx:X")) != -1) {
"AbcCdDeEFGhiI:lLmMo:Op:PqRsSt:uU:vVx:X")) != -1) {
switch (c) {
case 'b':
case 'c':
case 'C':
case 'd':
case 'D':
case 'E':
case 'G':
case 'h':
case 'i':
@ -4280,6 +4314,12 @@ main(int argc, char **argv)
break;
case 'U':
spa_config_path = optarg;
if (spa_config_path[0] != '/') {
(void) fprintf(stderr,
"cachefile must be an absolute path "
"(i.e. start with a slash)\n");
usage();
}
break;
case 'v':
verbose++;
@ -4331,7 +4371,7 @@ main(int argc, char **argv)
verbose = MAX(verbose, 1);
for (c = 0; c < 256; c++) {
if (dump_all && strchr("AeFlLOPRSX", c) == NULL)
if (dump_all && strchr("AeEFlLOPRSX", c) == NULL)
dump_opt[c] = 1;
if (dump_opt[c])
dump_opt[c] += verbose;
@ -4345,6 +4385,14 @@ main(int argc, char **argv)
if (argc < 2 && dump_opt['R'])
usage();
if (dump_opt['E']) {
if (argc != 1)
usage();
zdb_embedded_block(argv[0]);
return (0);
}
if (argc < 1) {
if (!dump_opt['e'] && dump_opt['C']) {
dump_cachefile(spa_config_path);

1
include/sys/blkptr.h
View File

@ -30,6 +30,7 @@ extern "C" {
void encode_embedded_bp_compressed(blkptr_t *, void *,
enum zio_compress, int, int);
void decode_embedded_bp_compressed(const blkptr_t *, void *);
int decode_embedded_bp(const blkptr_t *, void *, int);
#ifdef __cplusplus
}

12
man/man8/zdb.8
View File

@ -10,12 +10,12 @@
.\"
.\"
.\" Copyright 2012, Richard Lowe.
.\" Copyright (c) 2012, 2016 by Delphix. All rights reserved.
.\" Copyright (c) 2012, 2017 by Delphix. All rights reserved.
.\" Copyright 2017 Nexenta Systems, Inc.
.\" Copyright (c) 2017 Lawrence Livermore National Security, LLC.
.\" Copyright (c) 2017 Intel Corporation.
.\"
.Dd April 11, 2017
.Dd April 14, 2017
.Dt ZDB 8 SMM
.Os Linux
.Sh NAME
@ -41,6 +41,10 @@
.Op Fl A
.Op Fl U Ar cache
.Nm
.Fl E
.Op Fl A
.Ar word0 Ns : Ns Ar word1 Ns :...: Ns Ar word15
.Nm
.Fl l
.Op Fl Aqu
.Ar device
@ -155,6 +159,10 @@ Display the statistics independently for each deduplication table.
Dump the contents of the deduplication tables describing duplicate blocks.
.It Fl DDDDD
Also dump the contents of the deduplication tables describing unique blocks.
.It Fl E Ar word0 Ns : Ns Ar word1 Ns :...: Ns Ar word15
Decode and display block from an embedded block pointer specified by the
.Ar word
arguments.
.It Fl h
Display pool history similar to
.Nm zpool Cm history ,

33
module/zfs/blkptr.c
View File

@ -119,3 +119,36 @@ decode_embedded_bp_compressed(const blkptr_t *bp, void *buf)
buf8[i] = BF64_GET(w, (i % sizeof (w)) * NBBY, NBBY);
}
}
/*
* Fill in the buffer with the (decompressed) payload of the embedded
* blkptr_t. Takes into account compression and byteorder (the payload is
* treated as a stream of bytes).
* Return 0 on success, or ENOSPC if it won't fit in the buffer.
*/
int
decode_embedded_bp(const blkptr_t *bp, void *buf, int buflen)
{
int lsize, psize;
ASSERT(BP_IS_EMBEDDED(bp));
lsize = BPE_GET_LSIZE(bp);
psize = BPE_GET_PSIZE(bp);
if (lsize > buflen)
return (ENOSPC);
ASSERT3U(lsize, ==, buflen);
if (BP_GET_COMPRESS(bp) != ZIO_COMPRESS_OFF) {
uint8_t dstbuf[BPE_PAYLOAD_SIZE];
decode_embedded_bp_compressed(bp, dstbuf);
VERIFY0(zio_decompress_data_buf(BP_GET_COMPRESS(bp),
dstbuf, buf, psize, buflen));
} else {
ASSERT3U(lsize, ==, psize);
decode_embedded_bp_compressed(bp, buf);
}
return (0);
}