From: Fabian Ebner <f.ebner@proxmox.com>
To: qemu-devel@nongnu.org
Cc: kwolf@redhat.com, w.bumiller@proxmox.com, qemu-block@nongnu.org,
aderumier@odiso.com, hreitz@redhat.com, t.lamprecht@proxmox.com
Subject: [PATCH 4/4] qemu-img: dd: add -l option for loading a snapshot
Date: Thu, 10 Feb 2022 14:31:23 +0100 [thread overview]
Message-ID: <20220210133123.347350-5-f.ebner@proxmox.com> (raw)
In-Reply-To: <20220210133123.347350-1-f.ebner@proxmox.com>
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
---
docs/tools/qemu-img.rst | 7 ++++---
qemu-img-cmds.hx | 4 ++--
qemu-img.c | 33 +++++++++++++++++++++++++++++++--
3 files changed, 37 insertions(+), 7 deletions(-)
diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
index 9b022d9363..b2333d7b04 100644
--- a/docs/tools/qemu-img.rst
+++ b/docs/tools/qemu-img.rst
@@ -500,10 +500,11 @@ Command description:
it doesn't need to be specified separately in this case.
-.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] [isize=INPUT_SIZE] [osize=OUTPUT_SIZE] [if=INPUT] [of=OUTPUT]
+.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [-l SNAPSHOT_PARAM] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] [isize=INPUT_SIZE] [osize=OUTPUT_SIZE] [if=INPUT] [of=OUTPUT]
- dd copies from *INPUT* file (default: STDIN) to *OUTPUT* file (default:
- STDOUT) converting it from *FMT* format to *OUTPUT_FMT* format.
+ dd copies from *INPUT* file (default: STDIN) or snapshot *SNAPSHOT_PARAM* to
+ *OUTPUT* file (default: STDOUT) converting it from *FMT* format to
+ *OUTPUT_FMT* format.
The data is by default read and written using blocks of 512 bytes but can be
modified by specifying *BLOCK_SIZE*. If count=\ *BLOCKS* is specified
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index 97e750623f..2f527306b0 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -58,9 +58,9 @@ SRST
ERST
DEF("dd", img_dd,
- "dd [--image-opts] [-U] [-f fmt] [-O output_fmt] [-n] [bs=block_size] [count=blocks] [skip=blocks] [isize=input_size] [osize=output_size] [if=input] [of=output]")
+ "dd [--image-opts] [-U] [-f fmt] [-O output_fmt] [-n] [-l snapshot_param] [bs=block_size] [count=blocks] [skip=blocks] [isize=input_size] [osize=output_size] [if=input] [of=output]")
SRST
-.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] [isize=INPUT_SIZE] [osize=OUTPUT_SIZE] [if=INPUT] [of=OUTPUT]
+.. option:: dd [--image-opts] [-U] [-f FMT] [-O OUTPUT_FMT] [-n] [-l SNAPSHOT_PARAM] [bs=BLOCK_SIZE] [count=BLOCKS] [skip=BLOCKS] [isize=INPUT_SIZE] [osize=OUTPUT_SIZE] [if=INPUT] [of=OUTPUT]
ERST
DEF("info", img_info,
diff --git a/qemu-img.c b/qemu-img.c
index 89bf6fd087..28b6430800 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -4936,6 +4936,7 @@ static int img_dd(int argc, char **argv)
BlockDriver *drv = NULL, *proto_drv = NULL;
BlockBackend *blk1 = NULL, *blk2 = NULL;
QemuOpts *opts = NULL;
+ QemuOpts *sn_opts = NULL;
QemuOptsList *create_opts = NULL;
Error *local_err = NULL;
bool image_opts = false;
@@ -4945,6 +4946,7 @@ static int img_dd(int argc, char **argv)
int64_t size = 0, readsize = 0;
int64_t block_count = 0, out_pos, in_pos;
bool force_share = false, skip_create = false;
+ const char *snapshot_name = NULL;
struct DdInfo dd = {
.flags = 0,
.count = 0,
@@ -4982,7 +4984,7 @@ static int img_dd(int argc, char **argv)
{ 0, 0, 0, 0 }
};
- while ((c = getopt_long(argc, argv, ":hf:O:Un", long_options, NULL))) {
+ while ((c = getopt_long(argc, argv, ":hf:O:l:Un", long_options, NULL))) {
if (c == EOF) {
break;
}
@@ -5005,6 +5007,19 @@ static int img_dd(int argc, char **argv)
case 'n':
skip_create = true;
break;
+ case 'l':
+ if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
+ sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts,
+ optarg, false);
+ if (!sn_opts) {
+ error_report("Failed in parsing snapshot param '%s'",
+ optarg);
+ goto out;
+ }
+ } else {
+ snapshot_name = optarg;
+ }
+ break;
case 'U':
force_share = true;
break;
@@ -5074,11 +5089,24 @@ static int img_dd(int argc, char **argv)
if (dd.flags & C_IF) {
blk1 = img_open(image_opts, in.filename, fmt, 0, false, false,
force_share);
-
if (!blk1) {
ret = -1;
goto out;
}
+ if (sn_opts) {
+ bdrv_snapshot_load_tmp(blk_bs(blk1),
+ qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
+ qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
+ &local_err);
+ } else if (snapshot_name != NULL) {
+ bdrv_snapshot_load_tmp_by_id_or_name(blk_bs(blk1), snapshot_name,
+ &local_err);
+ }
+ if (local_err) {
+ error_reportf_err(local_err, "Failed to load snapshot: ");
+ ret = -1;
+ goto out;
+ }
}
if (dd.flags & C_ISIZE && dd.isize > 0) {
@@ -5233,6 +5261,7 @@ static int img_dd(int argc, char **argv)
out:
g_free(arg);
qemu_opts_del(opts);
+ qemu_opts_del(sn_opts);
qemu_opts_free(create_opts);
blk_unref(blk1);
blk_unref(blk2);
--
2.30.2
next prev parent reply other threads:[~2022-02-10 16:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-10 13:31 [PATCH 0/4] Make qemu-img dd more flexible Fabian Ebner
2022-02-10 13:31 ` [PATCH 1/4] qemu-img: dd: add osize and read from/to stdin/stdout Fabian Ebner
2022-02-10 13:31 ` [PATCH 2/4] qemu-img: dd: add isize parameter Fabian Ebner
2022-02-10 13:31 ` [PATCH 3/4] qemu-img: dd: add -n option (skip target volume creation) Fabian Ebner
2022-02-10 13:31 ` Fabian Ebner [this message]
2022-02-11 16:31 ` [PATCH 0/4] Make qemu-img dd more flexible Eric Blake
2022-02-11 16:42 ` Hanna Reitz
2022-02-15 8:49 ` Fabian Ebner
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