[Qemu-devel] [PATCH 04/10] block: amend: add 'force' option

[Maxim Levitsky <mlevitsk@redhat.com>]

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 block.c                   | 4 +++-
 block/qcow2.c             | 1 +
 include/block/block.h     | 1 +
 include/block/block_int.h | 1 +
 qemu-img-cmds.hx          | 4 ++--
 qemu-img.c                | 8 +++++++-
 qemu-img.texi             | 6 +++++-
 7 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/block.c b/block.c
index 874a29a983..df6707677a 100644
--- a/block.c
+++ b/block.c
@@ -6142,6 +6142,7 @@ 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) {
@@ -6153,7 +6154,8 @@ 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);
 }
 
 /* This function will be called by the bdrv_recurse_is_first_non_filter method
diff --git a/block/qcow2.c b/block/qcow2.c
index be4a5063e5..376bb416fd 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -4823,6 +4823,7 @@ 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/include/block/block.h b/include/block/block.h
index 124ad40809..6bc89c7667 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -400,6 +400,7 @@ 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);
 
 /* external snapshots */
diff --git a/include/block/block_int.h b/include/block/block_int.h
index ceec8c2f56..c6aa05214f 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -402,6 +402,7 @@ 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/qemu-img-cmds.hx b/qemu-img-cmds.hx
index 1c93e6d185..323ea10ad0 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -14,9 +14,9 @@ STEXI
 ETEXI
 
 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")
 STEXI
-@item amend [--object @var{objectdef}] [--image-opts] [-p] [-q] [-f @var{fmt}] [-t @var{cache}] -o @var{options} @var{filename}
+@item amend [--object @var{objectdef}] [--image-opts] [-p] [-q] [-f @var{fmt}] [-t @var{cache}] [--force] -o @var{options} @var{filename}
 ETEXI
 
 DEF("bench", img_bench,
diff --git a/qemu-img.c b/qemu-img.c
index 7daa05e51a..4533a44c1d 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -70,6 +70,7 @@ enum {
     OPTION_PREALLOCATION = 265,
     OPTION_SHRINK = 266,
     OPTION_SALVAGE = 267,
+    OPTION_FORCE = 268,
 };
 
 typedef enum OutputFormat {
@@ -3915,6 +3916,7 @@ 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 (;;) {
@@ -3922,6 +3924,7 @@ 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",
@@ -3977,6 +3980,9 @@ static int img_amend(int argc, char **argv)
         case OPTION_IMAGE_OPTS:
             image_opts = true;
             break;
+        case OPTION_FORCE:
+            force = true;
+            break;
         }
     }
 
@@ -4054,7 +4060,7 @@ 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.texi b/qemu-img.texi
index b5156d6316..b6ed4357e8 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -201,11 +201,15 @@ Command description:
 
 @table @option
 
-@item amend [--object @var{objectdef}] [--image-opts] [-p] [-q] [-f @var{fmt}] [-t @var{cache}] -o @var{options} @var{filename}
+@item amend [--object @var{objectdef}] [--image-opts] [-p] [-q] [-f @var{fmt}] [-t @var{cache}] [--force] -o @var{options} @var{filename}
 
 Amends the image format specific @var{options} for the image file
 @var{filename}. Not all file formats support this operation.
 
+--force allows some unsafe operations. Currently for -f luks,
+it allows to erase last encryption key, and to overwrite an active
+encryption key.
+
 @item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [--flush-interval=@var{flush_interval}] [-n] [--no-drain] [-o @var{offset}] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-S @var{step_size}] [-t @var{cache}] [-w] [-U] @var{filename}
 
 Run a simple sequential I/O benchmark on the specified image. If @code{-w} is
-- 
2.17.2