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[PULL 06/18] block/amend: add 'force' option
From: |
Max Reitz |
Subject: |
[PULL 06/18] block/amend: add 'force' option |
Date: |
Mon, 22 Jun 2020 17:10:47 +0200 |
From: Maxim Levitsky <mlevitsk@redhat.com>
'force' option will be used for some unsafe amend operations.
This includes things like erasing last keyslot in luks based formats
(which destroys the data, unless the master key is backed up
by external means), but that _might_ be desired result.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200608094030.670121-4-mlevitsk@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
docs/tools/qemu-img.rst | 5 ++++-
include/block/block.h | 1 +
include/block/block_int.h | 1 +
block.c | 4 +++-
block/qcow2.c | 1 +
qemu-img.c | 8 +++++++-
qemu-img-cmds.hx | 4 ++--
7 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
index 7f0737488a..e33f5575e3 100644
--- a/docs/tools/qemu-img.rst
+++ b/docs/tools/qemu-img.rst
@@ -253,11 +253,14 @@ Command description:
.. program:: qemu-img-commands
-.. option:: amend [--object OBJECTDEF] [--image-opts] [-p] [-q] [-f FMT] [-t
CACHE] -o OPTIONS FILENAME
+.. option:: amend [--object OBJECTDEF] [--image-opts] [-p] [-q] [-f FMT] [-t
CACHE] [--force] -o OPTIONS FILENAME
Amends the image format specific *OPTIONS* for the image file
*FILENAME*. Not all file formats support this operation.
+ --force allows some unsafe operations. Currently for -f luks, it allows to
+ erase the last encryption key, and to overwrite an active encryption key.
+
.. option:: bench [-c COUNT] [-d DEPTH] [-f FMT]
[--flush-interval=FLUSH_INTERVAL] [-i AIO] [-n] [--no-drain] [-o OFFSET]
[--pattern=PATTERN] [-q] [-s BUFFER_SIZE] [-S STEP_SIZE] [-t CACHE] [-w] [-U]
FILENAME
Run a simple sequential I/O benchmark on the specified image. If ``-w`` is
diff --git a/include/block/block.h b/include/block/block.h
index 25e299605e..86f9728f00 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -450,6 +450,7 @@ typedef void BlockDriverAmendStatusCB(BlockDriverState *bs,
int64_t offset,
int64_t total_work_size, void *opaque);
int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
BlockDriverAmendStatusCB *status_cb, void *cb_opaque,
+ bool force,
Error **errp);
/* check if a named node can be replaced when doing drive-mirror */
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 791de6a59c..066b9eaa40 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -440,6 +440,7 @@ struct BlockDriver {
int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts,
BlockDriverAmendStatusCB *status_cb,
void *cb_opaque,
+ bool force,
Error **errp);
void (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event);
diff --git a/block.c b/block.c
index 6dbcb7e083..144f52e413 100644
--- a/block.c
+++ b/block.c
@@ -6482,6 +6482,7 @@ void bdrv_remove_aio_context_notifier(BlockDriverState
*bs,
int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts,
BlockDriverAmendStatusCB *status_cb, void *cb_opaque,
+ bool force,
Error **errp)
{
if (!bs->drv) {
@@ -6493,7 +6494,8 @@ int bdrv_amend_options(BlockDriverState *bs, QemuOpts
*opts,
bs->drv->format_name);
return -ENOTSUP;
}
- return bs->drv->bdrv_amend_options(bs, opts, status_cb, cb_opaque, errp);
+ return bs->drv->bdrv_amend_options(bs, opts, status_cb,
+ cb_opaque, force, errp);
}
/*
diff --git a/block/qcow2.c b/block/qcow2.c
index 0cd2e6757e..2ab0c382f7 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -5340,6 +5340,7 @@ static void qcow2_amend_helper_cb(BlockDriverState *bs,
static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
BlockDriverAmendStatusCB *status_cb,
void *cb_opaque,
+ bool force,
Error **errp)
{
BDRVQcow2State *s = bs->opaque;
diff --git a/qemu-img.c b/qemu-img.c
index d7e846e607..10d81f09db 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -79,6 +79,7 @@ enum {
OPTION_DISABLE = 273,
OPTION_MERGE = 274,
OPTION_BITMAPS = 275,
+ OPTION_FORCE = 276,
};
typedef enum OutputFormat {
@@ -4099,6 +4100,7 @@ static int img_amend(int argc, char **argv)
BlockBackend *blk = NULL;
BlockDriverState *bs = NULL;
bool image_opts = false;
+ bool force = false;
cache = BDRV_DEFAULT_CACHE;
for (;;) {
@@ -4106,6 +4108,7 @@ static int img_amend(int argc, char **argv)
{"help", no_argument, 0, 'h'},
{"object", required_argument, 0, OPTION_OBJECT},
{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"force", no_argument, 0, OPTION_FORCE},
{0, 0, 0, 0}
};
c = getopt_long(argc, argv, ":ho:f:t:pq",
@@ -4153,6 +4156,9 @@ static int img_amend(int argc, char **argv)
case OPTION_IMAGE_OPTS:
image_opts = true;
break;
+ case OPTION_FORCE:
+ force = true;
+ break;
}
}
@@ -4230,7 +4236,7 @@ static int img_amend(int argc, char **argv)
/* In case the driver does not call amend_status_cb() */
qemu_progress_print(0.f, 0);
- ret = bdrv_amend_options(bs, opts, &amend_status_cb, NULL, &err);
+ ret = bdrv_amend_options(bs, opts, &amend_status_cb, NULL, force, &err);
qemu_progress_print(100.f, 0);
if (ret < 0) {
error_report_err(err);
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index 10b910b67c..b89c019b76 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -10,9 +10,9 @@ HXCOMM When amending the rST sections, please remember to
copy the usage
HXCOMM over to the per-command sections in docs/tools/qemu-img.rst.
DEF("amend", img_amend,
- "amend [--object objectdef] [--image-opts] [-p] [-q] [-f fmt] [-t cache]
-o options filename")
+ "amend [--object objectdef] [--image-opts] [-p] [-q] [-f fmt] [-t cache]
[--force] -o options filename")
SRST
-.. option:: amend [--object OBJECTDEF] [--image-opts] [-p] [-q] [-f FMT] [-t
CACHE] -o OPTIONS FILENAME
+.. option:: amend [--object OBJECTDEF] [--image-opts] [-p] [-q] [-f FMT] [-t
CACHE] [--force] -o OPTIONS FILENAME
ERST
DEF("bench", img_bench,
--
2.26.2
- [PULL 00/18] Block patches, Max Reitz, 2020/06/22
- [PULL 01/18] iotests: Make _filter_img_create more active, Max Reitz, 2020/06/22
- [PULL 03/18] block/block-copy: block_copy_dirty_clusters: fix failure check, Max Reitz, 2020/06/22
- [PULL 07/18] block/amend: separate amend and create options for qemu-img, Max Reitz, 2020/06/22
- [PULL 10/18] block/crypto: implement the encryption key management, Max Reitz, 2020/06/22
- [PULL 02/18] iotests: filter few more luks specific create options, Max Reitz, 2020/06/22
- [PULL 09/18] block/crypto: rename two functions, Max Reitz, 2020/06/22
- [PULL 05/18] qcrypto/luks: implement encryption key management, Max Reitz, 2020/06/22
- [PULL 06/18] block/amend: add 'force' option,
Max Reitz <=
- [PULL 04/18] qcrypto/core: add generic infrastructure for crypto options amendment, Max Reitz, 2020/06/22
- [PULL 08/18] block/amend: refactor qcow2 amend options, Max Reitz, 2020/06/22
- [PULL 11/18] block/qcow2: extend qemu-img amend interface with crypto options, Max Reitz, 2020/06/22
- [PULL 14/18] block/crypto: implement blockdev-amend, Max Reitz, 2020/06/22
- [PULL 18/18] iotests: don't test qcow2.py inside 291, Max Reitz, 2020/06/22
- [PULL 13/18] block/core: add generic infrastructure for x-blockdev-amend qmp command, Max Reitz, 2020/06/22
- [PULL 12/18] iotests: qemu-img tests for luks key management, Max Reitz, 2020/06/22
- [PULL 17/18] iotests: Fix 051 output after qdev_init_nofail() removal, Max Reitz, 2020/06/22
- [PULL 15/18] block/qcow2: implement blockdev-amend, Max Reitz, 2020/06/22
- [PULL 16/18] iotests: add tests for blockdev-amend, Max Reitz, 2020/06/22