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nbd patches for 2020-05-20

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- fix stranded fd in 'qemu-nbd -c /dev/nbd0'
 - add 'qemu-img map --start-offset --max-length' options
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Merge remote-tracking branch 'remotes/ericb/tags/pull-nbd-2020-05-18' into staging

nbd patches for 2020-05-20

- fix stranded fd in 'qemu-nbd -c /dev/nbd0'
- add 'qemu-img map --start-offset --max-length' options

# gpg: Signature made Mon 18 May 2020 17:29:56 BST
# gpg:                using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>" [full]
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>" [full]
# gpg:                 aka "[jpeg image of size 6874]" [full]
# Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 436A

* remotes/ericb/tags/pull-nbd-2020-05-18:
  iotests: Enhance 223 to cover qemu-img map improvements
  qemu-img: Add --start-offset and --max-length to map
  qemu-img: refactor dump_map_entry JSON format output
  qemu-img: validate image length in img_map
  qemu_img: add cvtnum_full to print error reports
  qemu-nbd: Close inherited stderr

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2020-05-18 20:04:54 +01:00
parent a28c9c8c9f d8154b0945
commit a89af8c20a
7 changed files with 85 additions and 57 deletions
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2
docs/tools/qemu-img.rst
View file

@ -519,7 +519,7 @@ Command description:
``ImageInfoSpecific*`` QAPI object (e.g. ``ImageInfoSpecificQCow2``
for qcow2 images).
.. option:: map [--object OBJECTDEF] [--image-opts] [-f FMT] [--output=OFMT] [-U] FILENAME
.. option:: map [--object OBJECTDEF] [--image-opts] [-f FMT] [--start-offset=OFFSET] [--max-length=LEN] [--output=OFMT] [-U] FILENAME
Dump the metadata of image *FILENAME* and its backing file chain.
In particular, this commands dumps the allocation state of every sector

4
qemu-img-cmds.hx
View file

@ -63,9 +63,9 @@ SRST
ERST
DEF("map", img_map,
"map [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt] [-U] filename")
"map [--object objectdef] [--image-opts] [-f fmt] [--start-offset=offset] [--max-length=len] [--output=ofmt] [-U] filename")
SRST
.. option:: map [--object OBJECTDEF] [--image-opts] [-f FMT] [--output=OFMT] [-U] FILENAME
.. option:: map [--object OBJECTDEF] [--image-opts] [-f FMT] [--start-offset=OFFSET] [--max-length=LEN] [--output=OFMT] [-U] FILENAME
ERST
DEF("measure", img_measure,

113
qemu-img.c
View file

@ -470,19 +470,31 @@ static int add_old_style_options(const char *fmt, QemuOpts *opts,
return 0;
}
static int64_t cvtnum(const char *s)
static int64_t cvtnum_full(const char *name, const char *value, int64_t min,
int64_t max)
{
int err;
uint64_t value;
uint64_t res;
err = qemu_strtosz(s, NULL, &value);
if (err < 0) {
err = qemu_strtosz(value, NULL, &res);
if (err < 0 && err != -ERANGE) {
error_report("Invalid %s specified. You may use "
"k, M, G, T, P or E suffixes for", name);
error_report("kilobytes, megabytes, gigabytes, terabytes, "
"petabytes and exabytes.");
return err;
}
if (value > INT64_MAX) {
if (err == -ERANGE || res > max || res < min) {
error_report("Invalid %s specified. Must be between %" PRId64
" and %" PRId64 ".", name, min, max);
return -ERANGE;
}
return value;
return res;
}
static int64_t cvtnum(const char *name, const char *value)
{
return cvtnum_full(name, value, 0, INT64_MAX);
}
static int img_create(int argc, char **argv)
@ -572,16 +584,8 @@ static int img_create(int argc, char **argv)
if (optind < argc) {
int64_t sval;
sval = cvtnum(argv[optind++]);
sval = cvtnum("image size", argv[optind++]);
if (sval < 0) {
if (sval == -ERANGE) {
error_report("Image size must be less than 8 EiB!");
} else {
error_report("Invalid image size specified! You may use k, M, "
"G, T, P or E suffixes for ");
error_report("kilobytes, megabytes, gigabytes, terabytes, "
"petabytes and exabytes.");
}
goto fail;
}
img_size = (uint64_t)sval;
@ -2187,8 +2191,10 @@ static int img_convert(int argc, char **argv)
{
int64_t sval;
sval = cvtnum(optarg);
if (sval < 0 || !QEMU_IS_ALIGNED(sval, BDRV_SECTOR_SIZE) ||
sval = cvtnum("buffer size for sparse output", optarg);
if (sval < 0) {
goto fail_getopt;
} else if (!QEMU_IS_ALIGNED(sval, BDRV_SECTOR_SIZE) ||
sval / BDRV_SECTOR_SIZE > MAX_BUF_SECTORS) {
error_report("Invalid buffer size for sparse output specified. "
"Valid sizes are multiples of %llu up to %llu. Select "
@ -2896,9 +2902,8 @@ static int dump_map_entry(OutputFormat output_format, MapEntry *e,
}
break;
case OFORMAT_JSON:
printf("%s{ \"start\": %"PRId64", \"length\": %"PRId64","
printf("{ \"start\": %"PRId64", \"length\": %"PRId64","
" \"depth\": %"PRId64", \"zero\": %s, \"data\": %s",
(e->start == 0 ? "[" : ",\n"),
e->start, e->length, e->depth,
e->zero ? "true" : "false",
e->data ? "true" : "false");
@ -2907,8 +2912,8 @@ static int dump_map_entry(OutputFormat output_format, MapEntry *e,
}
putchar('}');
if (!next) {
printf("]\n");
if (next) {
puts(",");
}
break;
}
@ -3004,6 +3009,8 @@ static int img_map(int argc, char **argv)
int ret = 0;
bool image_opts = false;
bool force_share = false;
int64_t start_offset = 0;
int64_t max_length = -1;
fmt = NULL;
output = NULL;
@ -3016,9 +3023,11 @@ static int img_map(int argc, char **argv)
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
{"force-share", no_argument, 0, 'U'},
{"start-offset", required_argument, 0, 's'},
{"max-length", required_argument, 0, 'l'},
{0, 0, 0, 0}
};
c = getopt_long(argc, argv, ":f:hU",
c = getopt_long(argc, argv, ":f:s:l:hU",
long_options, &option_index);
if (c == -1) {
break;
@ -3042,6 +3051,18 @@ static int img_map(int argc, char **argv)
case OPTION_OUTPUT:
output = optarg;
break;
case 's':
start_offset = cvtnum("start offset", optarg);
if (start_offset < 0) {
return 1;
}
break;
case 'l':
max_length = cvtnum("max length", optarg);
if (max_length < 0) {
return 1;
}
break;
case OPTION_OBJECT: {
QemuOpts *opts;
opts = qemu_opts_parse_noisily(&qemu_object_opts,
@ -3083,9 +3104,20 @@ static int img_map(int argc, char **argv)
if (output_format == OFORMAT_HUMAN) {
printf("%-16s%-16s%-16s%s\n", "Offset", "Length", "Mapped to", "File");
} else if (output_format == OFORMAT_JSON) {
putchar('[');
}
length = blk_getlength(blk);
if (length < 0) {
error_report("Failed to get size for '%s'", filename);
return 1;
}
if (max_length != -1) {
length = MIN(start_offset + max_length, length);
}
curr.start = start_offset;
while (curr.start + curr.length < length) {
int64_t offset = curr.start + curr.length;
int64_t n;
@ -3114,6 +3146,9 @@ static int img_map(int argc, char **argv)
}
ret = dump_map_entry(output_format, &curr, NULL);
if (output_format == OFORMAT_JSON) {
puts("]");
}
out:
blk_unref(blk);
@ -4291,9 +4326,8 @@ static int img_bench(int argc, char **argv)
break;
case 'o':
{
offset = cvtnum(optarg);
offset = cvtnum("offset", optarg);
if (offset < 0) {
error_report("Invalid offset specified");
return 1;
}
break;
@ -4306,9 +4340,8 @@ static int img_bench(int argc, char **argv)
{
int64_t sval;
sval = cvtnum(optarg);
if (sval < 0 || sval > INT_MAX) {
error_report("Invalid buffer size specified");
sval = cvtnum_full("buffer size", optarg, 0, INT_MAX);
if (sval < 0) {
return 1;
}
@ -4319,9 +4352,8 @@ static int img_bench(int argc, char **argv)
{
int64_t sval;
sval = cvtnum(optarg);
if (sval < 0 || sval > INT_MAX) {
error_report("Invalid step size specified");
sval = cvtnum_full("step_size", optarg, 0, INT_MAX);
if (sval < 0) {
return 1;
}
@ -4491,10 +4523,9 @@ static int img_dd_bs(const char *arg,
{
int64_t res;
res = cvtnum(arg);
res = cvtnum_full("bs", arg, 1, INT_MAX);
if (res <= 0 || res > INT_MAX) {
error_report("invalid number: '%s'", arg);
if (res < 0) {
return 1;
}
in->bsz = out->bsz = res;
@ -4506,10 +4537,9 @@ static int img_dd_count(const char *arg,
struct DdIo *in, struct DdIo *out,
struct DdInfo *dd)
{
dd->count = cvtnum(arg);
dd->count = cvtnum("count", arg);
if (dd->count < 0) {
error_report("invalid number: '%s'", arg);
return 1;
}
@ -4538,10 +4568,9 @@ static int img_dd_skip(const char *arg,
struct DdIo *in, struct DdIo *out,
struct DdInfo *dd)
{
in->offset = cvtnum(arg);
in->offset = cvtnum("skip", arg);
if (in->offset < 0) {
error_report("invalid number: '%s'", arg);
return 1;
}
@ -4923,16 +4952,8 @@ static int img_measure(int argc, char **argv)
{
int64_t sval;
sval = cvtnum(optarg);
sval = cvtnum("image size", optarg);
if (sval < 0) {
if (sval == -ERANGE) {
error_report("Image size must be less than 8 EiB!");
} else {
error_report("Invalid image size specified! You may use "
"k, M, G, T, P or E suffixes for ");
error_report("kilobytes, megabytes, gigabytes, terabytes, "
"petabytes and exabytes.");
}
goto out;
}
img_size = (uint64_t)sval;

6
qemu-nbd.c
View file

@ -916,7 +916,11 @@ int main(int argc, char **argv)
} else if (pid == 0) {
close(stderr_fd[0]);
old_stderr = dup(STDERR_FILENO);
/* Remember parent's stderr if we will be restoring it. */
if (fork_process) {
old_stderr = dup(STDERR_FILENO);
}
ret = qemu_daemon(1, 0);
/* Temporarily redirect stderr to the parent's pipe... */

8
tests/qemu-iotests/049.out
View file

@ -92,19 +92,19 @@ Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=1649267441664 cluster_size=65536 l
== 3. Invalid sizes ==
qemu-img create -f qcow2 TEST_DIR/t.qcow2 -- -1024
qemu-img: Image size must be less than 8 EiB!
qemu-img: Invalid image size specified. Must be between 0 and 9223372036854775807.
qemu-img create -f qcow2 -o size=-1024 TEST_DIR/t.qcow2
qemu-img: TEST_DIR/t.qcow2: Value '-1024' is out of range for parameter 'size'
qemu-img create -f qcow2 TEST_DIR/t.qcow2 -- -1k
qemu-img: Image size must be less than 8 EiB!
qemu-img: Invalid image size specified. Must be between 0 and 9223372036854775807.
qemu-img create -f qcow2 -o size=-1k TEST_DIR/t.qcow2
qemu-img: TEST_DIR/t.qcow2: Value '-1k' is out of range for parameter 'size'
qemu-img create -f qcow2 TEST_DIR/t.qcow2 -- 1kilobyte
qemu-img: Invalid image size specified! You may use k, M, G, T, P or E suffixes for
qemu-img: Invalid image size specified. You may use k, M, G, T, P or E suffixes for
qemu-img: kilobytes, megabytes, gigabytes, terabytes, petabytes and exabytes.
qemu-img create -f qcow2 -o size=1kilobyte TEST_DIR/t.qcow2
@ -113,7 +113,7 @@ Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
and exabytes, respectively.
qemu-img create -f qcow2 TEST_DIR/t.qcow2 -- foobar
qemu-img: Invalid image size specified! You may use k, M, G, T, P or E suffixes for
qemu-img: Invalid image size specified. You may use k, M, G, T, P or E suffixes for
qemu-img: kilobytes, megabytes, gigabytes, terabytes, petabytes and exabytes.
qemu-img create -f qcow2 -o size=foobar TEST_DIR/t.qcow2

6
tests/qemu-iotests/223
View file

@ -2,7 +2,7 @@
#
# Test reading dirty bitmap over NBD
#
# Copyright (C) 2018-2019 Red Hat, Inc.
# Copyright (C) 2018-2020 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@ -206,7 +206,9 @@ $QEMU_IMG map --output=json --image-opts \
nbd_server_start_unix_socket -f $IMGFMT -B b2 "$TEST_IMG"
IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket"
$QEMU_IMG map --output=json --image-opts \
$QEMU_IMG map --output=json --image-opts --max-length=12345 \
"$IMG,x-dirty-bitmap=qemu:dirty-bitmap:b2" | _filter_qemu_img_map
$QEMU_IMG map --output=json --image-opts --start-offset=12345 \
"$IMG,x-dirty-bitmap=qemu:dirty-bitmap:b2" | _filter_qemu_img_map
# success, all done

3
tests/qemu-iotests/223.out
View file

@ -201,6 +201,7 @@ read 2097152/2097152 bytes at offset 2097152
{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data": false}]
[{ "start": 0, "length": 512, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 512, "length": 512, "depth": 0, "zero": false, "data": false},
{ "start": 1024, "length": 2096128, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 1024, "length": 11321, "depth": 0, "zero": false, "data": true, "offset": OFFSET}]
[{ "start": 12345, "length": 2084807, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data": false}]
*** done