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zdb: add -B option to generate backup stream

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This is more-or-less like `zfs send`, but specifying the snapshot by its
objset id for situations where it can't be referenced any other way.

Sponsored-By: Klara, Inc.
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: WHR <msl0000023508@gmail.com>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #14642
This commit is contained in:
Rob Norris
2023-03-15 18:18:10 +11:00
committed by Brian Behlendorf
parent 2b9f8ba673
commit 8653f1de48
6 changed files with 174 additions and 9 deletions
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cmd/zdb/zdb.c
+92 -5
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@@ -33,6 +33,7 @@
* under sponsorship from the FreeBSD Foundation.
* Copyright (c) 2021 Allan Jude
* Copyright (c) 2021 Toomas Soome <tsoome@me.com>
* Copyright (c) 2023, Klara Inc.
*/
#include <stdio.h>
@@ -789,6 +790,9 @@ usage(void)
"\t\t[<poolname>[/<dataset | objset id>] [<object | range> ...]]\n"
"\t%s [-AdiPv] [-e [-V] [-p <path> ...]] [-U <cache>] [-K <key>]\n"
"\t\t[<poolname>[/<dataset | objset id>] [<object | range> ...]\n"
"\t%s -B [-e [-V] [-p <path> ...]] [-I <inflight I/Os>]\n"
"\t\t[-o <var>=<value>]... [-t <txg>] [-U <cache>] [-x <dumpdir>]\n"
"\t\t[-K <key>] <poolname>/<objset id> [<backupflags>]\n"
"\t%s [-v] <bookmark>\n"
"\t%s -C [-A] [-U <cache>]\n"
"\t%s -l [-Aqu] <device>\n"
@@ -802,7 +806,7 @@ usage(void)
"\t%s -S [-AP] [-e [-V] [-p <path> ...]] [-U <cache>] "
"<poolname>\n\n",
cmdname, cmdname, cmdname, cmdname, cmdname, cmdname, cmdname,
cmdname, cmdname, cmdname, cmdname);
cmdname, cmdname, cmdname, cmdname, cmdname);
(void) fprintf(stderr, " Dataset name must include at least one "
"separator character '/' or '@'\n");
@@ -825,6 +829,8 @@ usage(void)
(void) fprintf(stderr, " Options to control amount of output:\n");
(void) fprintf(stderr, " -b --block-stats "
"block statistics\n");
(void) fprintf(stderr, " -B --backup "
"backup stream\n");
(void) fprintf(stderr, " -c --checksum "
"checksum all metadata (twice for all data) blocks\n");
(void) fprintf(stderr, " -C --config "
@@ -4875,6 +4881,81 @@ dump_path(char *ds, char *path, uint64_t *retobj)
return (err);
}
static int
dump_backup_bytes(objset_t *os, void *buf, int len, void *arg)
{
const char *p = (const char *)buf;
ssize_t nwritten;
(void) os;
(void) arg;
/* Write the data out, handling short writes and signals. */
while ((nwritten = write(STDOUT_FILENO, p, len)) < len) {
if (nwritten < 0) {
if (errno == EINTR)
continue;
return (errno);
}
p += nwritten;
len -= nwritten;
}
return (0);
}
static void
dump_backup(const char *pool, uint64_t objset_id, const char *flagstr)
{
boolean_t embed = B_FALSE;
boolean_t large_block = B_FALSE;
boolean_t compress = B_FALSE;
boolean_t raw = B_FALSE;
const char *c;
for (c = flagstr; c != NULL && *c != '\0'; c++) {
switch (*c) {
case 'e':
embed = B_TRUE;
break;
case 'L':
large_block = B_TRUE;
break;
case 'c':
compress = B_TRUE;
break;
case 'w':
raw = B_TRUE;
break;
default:
fprintf(stderr, "dump_backup: invalid flag "
"'%c'\n", *c);
return;
}
}
if (isatty(STDOUT_FILENO)) {
fprintf(stderr, "dump_backup: stream cannot be written "
"to a terminal\n");
return;
}
offset_t off = 0;
dmu_send_outparams_t out = {
.dso_outfunc = dump_backup_bytes,
.dso_dryrun = B_FALSE,
};
int err = dmu_send_obj(pool, objset_id, /* fromsnap */0, embed,
large_block, compress, raw, /* saved */ B_FALSE, STDOUT_FILENO,
&off, &out);
if (err != 0) {
fprintf(stderr, "dump_backup: dmu_send_obj: %s\n",
strerror(err));
return;
}
}
static int
zdb_copy_object(objset_t *os, uint64_t srcobj, char *destfile)
{
@@ -8695,6 +8776,7 @@ main(int argc, char **argv)
struct option long_options[] = {
{"ignore-assertions", no_argument, NULL, 'A'},
{"block-stats", no_argument, NULL, 'b'},
{"backup", no_argument, NULL, 'B'},
{"checksum", no_argument, NULL, 'c'},
{"config", no_argument, NULL, 'C'},
{"datasets", no_argument, NULL, 'd'},
@@ -8736,10 +8818,11 @@ main(int argc, char **argv)
};
while ((c = getopt_long(argc, argv,
"AbcCdDeEFGhiI:kK:lLmMNo:Op:PqrRsSt:uU:vVx:XYyZ",
"AbBcCdDeEFGhiI:kK:lLmMNo:Op:PqrRsSt:uU:vVx:XYyZ",
long_options, NULL)) != -1) {
switch (c) {
case 'b':
case 'B':
case 'c':
case 'C':
case 'd':
@@ -8887,7 +8970,7 @@ main(int argc, char **argv)
verbose = MAX(verbose, 1);
for (c = 0; c < 256; c++) {
if (dump_all && strchr("AeEFkKlLNOPrRSXy", c) == NULL)
if (dump_all && strchr("ABeEFkKlLNOPrRSXy", c) == NULL)
dump_opt[c] = 1;
if (dump_opt[c])
dump_opt[c] += verbose;
@@ -9073,7 +9156,8 @@ main(int argc, char **argv)
checkpoint_pool, error);
}
} else if (target_is_spa || dump_opt['R'] || objset_id == 0) {
} else if (target_is_spa || dump_opt['R'] || dump_opt['B'] ||
objset_id == 0) {
zdb_set_skip_mmp(target);
error = spa_open_rewind(target, &spa, FTAG, policy,
NULL);
@@ -9209,7 +9293,10 @@ retry_lookup:
strerror(errno));
}
}
if (os != NULL) {
if (dump_opt['B']) {
dump_backup(target, objset_id,
argc > 0 ? argv[0] : NULL);
} else if (os != NULL) {
dump_objset(os);
} else if (zopt_object_args > 0 && !dump_opt['m']) {
dump_objset(spa->spa_meta_objset);