pve-qemu-qoup/debian/patches/pve/0012-qemu-img-dd-add-l-option-for-loading-a-snapshot.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Fabian Ebner <f.ebner@proxmox.com>
Date: Mon, 7 Feb 2022 14:21:01 +0100
squash related patches where there is no good reason to keep them separate. It's a pain during rebase if there are multiple patches changing the same code over and over again. This was especially bad for the backup-related patches. If the history of patches really is needed, it can be extracted via git. Additionally, compilation with partial application of patches was broken since a long time, because one of the master key changes became part of an earlier patch during a past rebase. If only the same files were changed by a subsequent patch and the changes felt to belong together (obvious for later bug fixes, but also done for features e.g. adding master key support for PBS), the patches were squashed together. The PBS namespace support patch was split into the individual parts it changes, i.e. PBS block driver, pbs-restore binary and QMP backup infrastructure, and squashed into the respective patches. No code change is intended, git diff in the submodule should not show any difference between applying all patches before this commit and applying all patches after this commit. The query-proxmox-support QMP function has been left as part of the "PVE-Backup: Proxmox backup patches for QEMU" patch, because it's currently only used there. If it ever is used elsewhere too, it can be split out from there. The recent alloc-track and BQL-related savevm-async changes have been left separate for now, because it's not 100% clear they are the best approach yet. This depends on what upstream decides about the BQL stuff and whether and what kind of issues with the changes pop up. The qemu-img dd snapshot patch has been re-ordered to after the other qemu-img dd patches. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
2023-05-15 16:39:56 +03:00
Subject: [PATCH] qemu-img dd: add -l option for loading a snapshot
squash related patches where there is no good reason to keep them separate. It's a pain during rebase if there are multiple patches changing the same code over and over again. This was especially bad for the backup-related patches. If the history of patches really is needed, it can be extracted via git. Additionally, compilation with partial application of patches was broken since a long time, because one of the master key changes became part of an earlier patch during a past rebase. If only the same files were changed by a subsequent patch and the changes felt to belong together (obvious for later bug fixes, but also done for features e.g. adding master key support for PBS), the patches were squashed together. The PBS namespace support patch was split into the individual parts it changes, i.e. PBS block driver, pbs-restore binary and QMP backup infrastructure, and squashed into the respective patches. No code change is intended, git diff in the submodule should not show any difference between applying all patches before this commit and applying all patches after this commit. The query-proxmox-support QMP function has been left as part of the "PVE-Backup: Proxmox backup patches for QEMU" patch, because it's currently only used there. If it ever is used elsewhere too, it can be split out from there. The recent alloc-track and BQL-related savevm-async changes have been left separate for now, because it's not 100% clear they are the best approach yet. This depends on what upstream decides about the BQL stuff and whether and what kind of issues with the changes pop up. The qemu-img dd snapshot patch has been re-ordered to after the other qemu-img dd patches. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
2023-05-15 16:39:56 +03:00
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
docs/tools/qemu-img.rst | 6 +++---
qemu-img-cmds.hx | 4 ++--
qemu-img.c | 33 +++++++++++++++++++++++++++++++--
3 files changed, 36 insertions(+), 7 deletions(-)
diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
update submodule and patches to 7.2.0 User-facing breaking change: The slirp submodule for user networking got removed. It would be necessary to add the --enable-slirp option to the build and/or install the appropriate library to continue building it. Since PVE is not explicitly supporting it, it would require additionally installing the libslirp0 package on all installations and there is *very* little mention on the community forum when searching for "slirp" or "netdev user", the plan is to only enable it again if there is some real demand for it. Notable changes: * The big change for this release is the rework of job locking, using a job mutex and introducing _locked() variants of job API functions moving away from call-side AioContext locking. See (in the qemu submodule) commit 6f592e5aca ("job.c: enable job lock/unlock and remove Aiocontext locks") and previous commits for context. Changes required for the backup patches: * Use WITH_JOB_LOCK_GUARD() and call the _locked() variant of job API functions where appropriate (many are only availalbe as a _locked() variant). * Remove acquiring/releasing AioContext around functions taking the job mutex lock internally. The patch introducing sequential transaction support for jobs needs to temporarily unlock the job mutex to call job_start() when starting the next job in the transaction. * The zeroinit block driver now marks its child as primary. The documentation in include/block/block-common.h states: > Filter node has exactly one FILTERED|PRIMARY child, and may have > other children which must not have these bits Without this, an assert will trigger when copying to a zeroinit target with qemu-img convert, because bdrv_child_cb_attach() expects any non-PRIMARY child to be not FILTERED: > qemu-img convert -n -p -f raw -O raw input.raw zeroinit:output.raw > qemu-img: ../block.c:1476: bdrv_child_cb_attach: Assertion > `!(child->role & BDRV_CHILD_FILTERED)' failed. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
2022-12-14 17:16:32 +03:00
index 5e713e231d..9390d5e5cf 100644
--- a/docs/tools/qemu-img.rst
+++ b/docs/tools/qemu-img.rst
@@ -492,10 +492,10 @@ 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] 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] if=INPUT of=OUTPUT
- dd copies from *INPUT* file to *OUTPUT* file converting it from
- *FMT* format to *OUTPUT_FMT* format.
+ dd copies from *INPUT* file or snapshot *SNAPSHOT_PARAM* to *OUTPUT* file
+ 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 b5b0bb4467..36f97e1f19 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] [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] [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] [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] [osize=OUTPUT_SIZE] if=INPUT of=OUTPUT
ERST
DEF("info", img_info,
diff --git a/qemu-img.c b/qemu-img.c
index 9d414d639b..e13a12137b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -5016,6 +5016,7 @@ 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;
@@ -5025,6 +5026,7 @@ static int img_dd(int argc, char **argv)
int64_t size = 0, readsize = 0;
update submodule and patches to 7.2.0 User-facing breaking change: The slirp submodule for user networking got removed. It would be necessary to add the --enable-slirp option to the build and/or install the appropriate library to continue building it. Since PVE is not explicitly supporting it, it would require additionally installing the libslirp0 package on all installations and there is *very* little mention on the community forum when searching for "slirp" or "netdev user", the plan is to only enable it again if there is some real demand for it. Notable changes: * The big change for this release is the rework of job locking, using a job mutex and introducing _locked() variants of job API functions moving away from call-side AioContext locking. See (in the qemu submodule) commit 6f592e5aca ("job.c: enable job lock/unlock and remove Aiocontext locks") and previous commits for context. Changes required for the backup patches: * Use WITH_JOB_LOCK_GUARD() and call the _locked() variant of job API functions where appropriate (many are only availalbe as a _locked() variant). * Remove acquiring/releasing AioContext around functions taking the job mutex lock internally. The patch introducing sequential transaction support for jobs needs to temporarily unlock the job mutex to call job_start() when starting the next job in the transaction. * The zeroinit block driver now marks its child as primary. The documentation in include/block/block-common.h states: > Filter node has exactly one FILTERED|PRIMARY child, and may have > other children which must not have these bits Without this, an assert will trigger when copying to a zeroinit target with qemu-img convert, because bdrv_child_cb_attach() expects any non-PRIMARY child to be not FILTERED: > qemu-img convert -n -p -f raw -O raw input.raw zeroinit:output.raw > qemu-img: ../block.c:1476: bdrv_child_cb_attach: Assertion > `!(child->role & BDRV_CHILD_FILTERED)' failed. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
2022-12-14 17:16:32 +03:00
int64_t out_pos, in_pos;
bool force_share = false, skip_create = false;
+ const char *snapshot_name = NULL;
struct DdInfo dd = {
.flags = 0,
.count = 0,
@@ -5062,7 +5064,7 @@ 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;
}
@@ -5085,6 +5087,19 @@ 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;
@@ -5144,11 +5159,24 @@ 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_OSIZE) {
@@ -5303,6 +5331,7 @@ 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);