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authorEric Blake <eblake@redhat.com>2020-05-12 20:16:45 -0500
committerEric Blake <eblake@redhat.com>2020-05-19 12:53:22 -0500
commit3b51ab4bf0f49a01cc2db7b954e0669e081719b5 (patch)
treee932eeb622b2e4c39ed7581daea7b6c8de2f1717
parentbb4e58c6137e80129b955789dd4b66c1504f20dc (diff)
downloadqemu-arm-3b51ab4bf0f49a01cc2db7b954e0669e081719b5.tar.gz
qemu-img: Add bitmap sub-command
Include actions for --add, --remove, --clear, --enable, --disable, and --merge (note that --clear is a bit of fluff, because the same can be accomplished by removing a bitmap and then adding a new one in its place, but it matches what QMP commands exist). Listing is omitted, because it does not require a bitmap name and because it was already possible with 'qemu-img info'. A single command line can play one or more bitmap commands in sequence on the same bitmap name (although all added bitmaps share the same granularity, and and all merged bitmaps come from the same source file). Merge defaults to other bitmaps in the primary image, but can also be told to merge bitmaps from a distinct image. While this supports --image-opts for the file being modified, I did not think it worth the extra complexity to support that for the source file in a cross-file merges. Likewise, I chose to have --merge only take a single source rather than following the QMP support for multiple merges in one go (although you can still use more than one --merge in the command line); in part because qemu-img is offline and therefore atomicity is not an issue. Upcoming patches will add iotest coverage of these commands while also testing other features. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200513011648.166876-7-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
-rw-r--r--docs/tools/qemu-img.rst24
-rw-r--r--qemu-img-cmds.hx7
-rw-r--r--qemu-img.c248
3 files changed, 279 insertions, 0 deletions
diff --git a/docs/tools/qemu-img.rst b/docs/tools/qemu-img.rst
index 3b6223b5d6..38d464ea3f 100644
--- a/docs/tools/qemu-img.rst
+++ b/docs/tools/qemu-img.rst
@@ -281,6 +281,30 @@ Command description:
For write tests, by default a buffer filled with zeros is written. This can be
overridden with a pattern byte specified by *PATTERN*.
+.. option:: bitmap (--merge SOURCE | --add | --remove | --clear | --enable | --disable)... [-b SOURCE_FILE [-F SOURCE_FMT]] [-g GRANULARITY] [--object OBJECTDEF] [--image-opts | -f FMT] FILENAME BITMAP
+
+ Perform one or more modifications of the persistent bitmap *BITMAP*
+ in the disk image *FILENAME*. The various modifications are:
+
+ ``--add`` to create *BITMAP*, enabled to record future edits.
+
+ ``--remove`` to remove *BITMAP*.
+
+ ``--clear`` to clear *BITMAP*.
+
+ ``--enable`` to change *BITMAP* to start recording future edits.
+
+ ``--disable`` to change *BITMAP* to stop recording future edits.
+
+ ``--merge`` to merge the contents of *SOURCE_BITMAP* into *BITMAP*.
+
+ Additional options include ``-g`` which sets a non-default
+ *GRANULARITY* for ``--add``, and ``-b`` and ``-F`` which select an
+ alternative source file for all *SOURCE* bitmaps used by
+ ``--merge``.
+
+ To see what bitmaps are present in an image, use ``qemu-img info``.
+
.. option:: check [--object OBJECTDEF] [--image-opts] [-q] [-f FMT] [--output=OFMT] [-r [leaks | all]] [-T SRC_CACHE] [-U] FILENAME
Perform a consistency check on the disk image *FILENAME*. The command can
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index cfe8f37587..a87d3cb264 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -20,6 +20,13 @@ DEF("bench", img_bench,
SRST
.. 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
ERST
+
+DEF("bitmap", img_bitmap,
+ "bitmap (--merge SOURCE | --add | --remove | --clear | --enable | --disable)... [-b source_file [-F source_fmt]] [-g granularity] [--object objectdef] [--image-opts | -f fmt] filename bitmap")
+SRST
+.. option:: bitmap (--merge SOURCE | --add | --remove | --clear | --enable | --disable)... [-b SOURCE_FILE [-F SOURCE_FMT]] [-g GRANULARITY] [--object OBJECTDEF] [--image-opts | -f FMT] FILENAME BITMAP
+ERST
+
DEF("check", img_check,
"check [--object objectdef] [--image-opts] [-q] [-f fmt] [--output=ofmt] [-r [leaks | all]] [-T src_cache] [-U] filename")
SRST
diff --git a/qemu-img.c b/qemu-img.c
index 4740de082f..2d30682f12 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -28,6 +28,7 @@
#include "qemu-common.h"
#include "qemu-version.h"
#include "qapi/error.h"
+#include "qapi/qapi-commands-block-core.h"
#include "qapi/qapi-visit-block-core.h"
#include "qapi/qobject-output-visitor.h"
#include "qapi/qmp/qjson.h"
@@ -71,6 +72,12 @@ enum {
OPTION_SHRINK = 266,
OPTION_SALVAGE = 267,
OPTION_TARGET_IS_ZERO = 268,
+ OPTION_ADD = 269,
+ OPTION_REMOVE = 270,
+ OPTION_CLEAR = 271,
+ OPTION_ENABLE = 272,
+ OPTION_DISABLE = 273,
+ OPTION_MERGE = 274,
};
typedef enum OutputFormat {
@@ -169,6 +176,14 @@ static void QEMU_NORETURN help(void)
" '-n' skips the target volume creation (useful if the volume is created\n"
" prior to running qemu-img)\n"
"\n"
+ "Parameters to bitmap subcommand:\n"
+ " 'bitmap' is the name of the bitmap to manipulate, through one or more\n"
+ " actions from '--add', '--remove', '--clear', '--enable', '--disable',\n"
+ " or '--merge source'\n"
+ " '-g granularity' sets the granularity for '--add' actions\n"
+ " '-b source' and '-F src_fmt' tell '--merge' actions to find the source\n"
+ " bitmaps from an alternative file\n"
+ "\n"
"Parameters to check subcommand:\n"
" '-r' tries to repair any inconsistencies that are found during the check.\n"
" '-r leaks' repairs only cluster leaks, whereas '-r all' fixes all\n"
@@ -4502,6 +4517,239 @@ out:
return 0;
}
+enum ImgBitmapAct {
+ BITMAP_ADD,
+ BITMAP_REMOVE,
+ BITMAP_CLEAR,
+ BITMAP_ENABLE,
+ BITMAP_DISABLE,
+ BITMAP_MERGE,
+};
+typedef struct ImgBitmapAction {
+ enum ImgBitmapAct act;
+ const char *src; /* only used for merge */
+ QSIMPLEQ_ENTRY(ImgBitmapAction) next;
+} ImgBitmapAction;
+
+static int img_bitmap(int argc, char **argv)
+{
+ Error *err = NULL;
+ int c, ret = 1;
+ QemuOpts *opts = NULL;
+ const char *fmt = NULL, *src_fmt = NULL, *src_filename = NULL;
+ const char *filename, *bitmap;
+ BlockBackend *blk = NULL, *src = NULL;
+ BlockDriverState *bs = NULL, *src_bs = NULL;
+ bool image_opts = false;
+ int64_t granularity = 0;
+ bool add = false, merge = false;
+ QSIMPLEQ_HEAD(, ImgBitmapAction) actions;
+ ImgBitmapAction *act, *act_next;
+ const char *op;
+
+ QSIMPLEQ_INIT(&actions);
+
+ for (;;) {
+ static const struct option long_options[] = {
+ {"help", no_argument, 0, 'h'},
+ {"object", required_argument, 0, OPTION_OBJECT},
+ {"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
+ {"add", no_argument, 0, OPTION_ADD},
+ {"remove", no_argument, 0, OPTION_REMOVE},
+ {"clear", no_argument, 0, OPTION_CLEAR},
+ {"enable", no_argument, 0, OPTION_ENABLE},
+ {"disable", no_argument, 0, OPTION_DISABLE},
+ {"merge", required_argument, 0, OPTION_MERGE},
+ {"granularity", required_argument, 0, 'g'},
+ {"source-file", required_argument, 0, 'b'},
+ {"source-format", required_argument, 0, 'F'},
+ {0, 0, 0, 0}
+ };
+ c = getopt_long(argc, argv, ":b:f:F:g:h", long_options, NULL);
+ if (c == -1) {
+ break;
+ }
+
+ switch (c) {
+ case ':':
+ missing_argument(argv[optind - 1]);
+ break;
+ case '?':
+ unrecognized_option(argv[optind - 1]);
+ break;
+ case 'h':
+ help();
+ break;
+ case 'b':
+ src_filename = optarg;
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ case 'F':
+ src_fmt = optarg;
+ break;
+ case 'g':
+ granularity = cvtnum("granularity", optarg);
+ if (granularity < 0) {
+ return 1;
+ }
+ break;
+ case OPTION_ADD:
+ act = g_new0(ImgBitmapAction, 1);
+ act->act = BITMAP_ADD;
+ QSIMPLEQ_INSERT_TAIL(&actions, act, next);
+ add = true;
+ break;
+ case OPTION_REMOVE:
+ act = g_new0(ImgBitmapAction, 1);
+ act->act = BITMAP_REMOVE;
+ QSIMPLEQ_INSERT_TAIL(&actions, act, next);
+ break;
+ case OPTION_CLEAR:
+ act = g_new0(ImgBitmapAction, 1);
+ act->act = BITMAP_CLEAR;
+ QSIMPLEQ_INSERT_TAIL(&actions, act, next);
+ break;
+ case OPTION_ENABLE:
+ act = g_new0(ImgBitmapAction, 1);
+ act->act = BITMAP_ENABLE;
+ QSIMPLEQ_INSERT_TAIL(&actions, act, next);
+ break;
+ case OPTION_DISABLE:
+ act = g_new0(ImgBitmapAction, 1);
+ act->act = BITMAP_DISABLE;
+ QSIMPLEQ_INSERT_TAIL(&actions, act, next);
+ break;
+ case OPTION_MERGE:
+ act = g_new0(ImgBitmapAction, 1);
+ act->act = BITMAP_MERGE;
+ act->src = optarg;
+ QSIMPLEQ_INSERT_TAIL(&actions, act, next);
+ merge = true;
+ break;
+ case OPTION_OBJECT:
+ opts = qemu_opts_parse_noisily(&qemu_object_opts, optarg, true);
+ if (!opts) {
+ goto out;
+ }
+ break;
+ case OPTION_IMAGE_OPTS:
+ image_opts = true;
+ break;
+ }
+ }
+
+ if (qemu_opts_foreach(&qemu_object_opts,
+ user_creatable_add_opts_foreach,
+ qemu_img_object_print_help, &error_fatal)) {
+ goto out;
+ }
+
+ if (QSIMPLEQ_EMPTY(&actions)) {
+ error_report("Need at least one of --add, --remove, --clear, "
+ "--enable, --disable, or --merge");
+ goto out;
+ }
+
+ if (granularity && !add) {
+ error_report("granularity only supported with --add");
+ goto out;
+ }
+ if (src_fmt && !src_filename) {
+ error_report("-F only supported with -b");
+ goto out;
+ }
+ if (src_filename && !merge) {
+ error_report("Merge bitmap source file only supported with "
+ "--merge");
+ goto out;
+ }
+
+ if (optind != argc - 2) {
+ error_report("Expecting filename and bitmap name");
+ goto out;
+ }
+
+ filename = argv[optind];
+ bitmap = argv[optind + 1];
+
+ blk = img_open(image_opts, filename, fmt, BDRV_O_RDWR, false, false,
+ false);
+ if (!blk) {
+ goto out;
+ }
+ bs = blk_bs(blk);
+ if (src_filename) {
+ src = img_open(false, src_filename, src_fmt, 0, false, false, false);
+ if (!src) {
+ goto out;
+ }
+ src_bs = blk_bs(src);
+ } else {
+ src_bs = bs;
+ }
+
+ QSIMPLEQ_FOREACH_SAFE(act, &actions, next, act_next) {
+ switch (act->act) {
+ case BITMAP_ADD:
+ qmp_block_dirty_bitmap_add(bs->node_name, bitmap,
+ !!granularity, granularity, true, true,
+ false, false, &err);
+ op = "add";
+ break;
+ case BITMAP_REMOVE:
+ qmp_block_dirty_bitmap_remove(bs->node_name, bitmap, &err);
+ op = "remove";
+ break;
+ case BITMAP_CLEAR:
+ qmp_block_dirty_bitmap_clear(bs->node_name, bitmap, &err);
+ op = "clear";
+ break;
+ case BITMAP_ENABLE:
+ qmp_block_dirty_bitmap_enable(bs->node_name, bitmap, &err);
+ op = "enable";
+ break;
+ case BITMAP_DISABLE:
+ qmp_block_dirty_bitmap_disable(bs->node_name, bitmap, &err);
+ op = "disable";
+ break;
+ case BITMAP_MERGE: {
+ BlockDirtyBitmapMergeSource *merge_src;
+ BlockDirtyBitmapMergeSourceList *list;
+
+ merge_src = g_new0(BlockDirtyBitmapMergeSource, 1);
+ merge_src->type = QTYPE_QDICT;
+ merge_src->u.external.node = g_strdup(src_bs->node_name);
+ merge_src->u.external.name = g_strdup(act->src);
+ list = g_new0(BlockDirtyBitmapMergeSourceList, 1);
+ list->value = merge_src;
+ qmp_block_dirty_bitmap_merge(bs->node_name, bitmap, list, &err);
+ qapi_free_BlockDirtyBitmapMergeSourceList(list);
+ op = "merge";
+ break;
+ }
+ default:
+ g_assert_not_reached();
+ }
+
+ if (err) {
+ error_reportf_err(err, "Operation %s on bitmap %s failed: ",
+ op, bitmap);
+ goto out;
+ }
+ g_free(act);
+ }
+
+ ret = 0;
+
+ out:
+ blk_unref(src);
+ blk_unref(blk);
+ qemu_opts_del(opts);
+ return ret;
+}
+
#define C_BS 01
#define C_COUNT 02
#define C_IF 04