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[Qemu-devel] [RFC PATCH 11/12] qemu-img: add bitmap dump
From: |
John Snow |
Subject: |
[Qemu-devel] [RFC PATCH 11/12] qemu-img: add bitmap dump |
Date: |
Fri, 11 May 2018 21:25:36 -0400 |
Signed-off-by: John Snow <address@hidden>
---
qemu-img-cmds.hx | 6 ++
qemu-img.c | 185 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 191 insertions(+)
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index 2fe31893cf..d25f359f5a 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -22,6 +22,12 @@ STEXI
@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] address@hidden
[-n] [--no-drain] [-o @var{offset}] address@hidden [-q] [-s @var{buffer_size}]
[-S @var{step_size}] [-t @var{cache}] [-w] [-U] @var{filename}
ETEXI
+DEF("bitmap", img_bitmap,
+ "bitmap dump [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt]
[-U] filename [bitmap]")
+STEXI
address@hidden bitmap dump [--object @var{objectdef}] [--image-opts] [-f
@var{fmt}] address@hidden [-U] @var{filename} address@hidden
+ETEXI
+
DEF("check", img_check,
"check [-q] [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt]
[-r [leaks | all]] [-T src_cache] [-U] filename")
STEXI
diff --git a/qemu-img.c b/qemu-img.c
index e31e38f674..1141216617 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2881,6 +2881,191 @@ out1:
return ret < 0;
}
+static BitmapMapping *get_bitmap_mapping(BdrvDirtyBitmap *bitmap)
+{
+ BdrvDirtyBitmapIter *it = bdrv_dirty_iter_new(bitmap);
+ BitmapMapping *bm = g_new0(BitmapMapping, 1);
+ BitmapEntry *entry;
+ BitmapEntryList *tmp, **last;
+ int64_t offset;
+ int64_t zero_offset;
+
+ bm->name = g_strdup(bdrv_dirty_bitmap_name(bitmap));
+ bm->entries = NULL;
+ last = &bm->entries;
+
+ while (true) {
+ offset = bdrv_dirty_iter_next(it);
+ if (offset == -1) {
+ break;
+ }
+
+ zero_offset = bdrv_dirty_bitmap_next_zero(bitmap, offset);
+ if (zero_offset == -1) {
+ zero_offset = bdrv_dirty_bitmap_size(bitmap);
+ }
+
+ entry = g_new0(BitmapEntry, 1);
+ entry->offset = offset;
+ entry->length = zero_offset - offset;
+
+ tmp = g_new0(BitmapEntryList, 1);
+ tmp->value = entry;
+ *last = tmp;
+ last = &tmp->next;
+
+ if (zero_offset >= bdrv_dirty_bitmap_size(bitmap)) {
+ break;
+ }
+ bdrv_set_dirty_iter(it, zero_offset);
+ }
+
+ bdrv_dirty_iter_free(it);
+ return bm;
+}
+
+static void dump_bitmap_mapping_json(BitmapMapping *bm, int indent,
+ FILE *stream)
+{
+ QString *str;
+ QObject *obj;
+ Visitor *v = qobject_output_visitor_new(&obj);
+ const int pretty = 1;
+
+ visit_type_BitmapMapping(v, NULL, &bm, &error_abort);
+ visit_complete(v, &obj);
+ str = qobject_to_json_opt(obj, pretty, indent);
+ assert(str != NULL);
+ fprintf(stream, "%*s%s", 4 * indent, "", qstring_get_str(str));
+ qobject_unref(obj);
+ visit_free(v);
+ qobject_unref(str);
+}
+
+static void dump_bitmap_mapping_human(BitmapMapping *bm, FILE *stream)
+{
+ BitmapEntryList *bl = bm->entries;
+
+ fprintf(stream, "# %s\n", bm->name);
+ fprintf(stream, "%-16s%-16s\n", "Offset", "Length");
+ for ( ; bl; bl = bl->next) {
+ BitmapEntry *be = bl->value;
+ fprintf(stream, "%-16"PRId64"%-16"PRId64"\n", be->offset, be->length);
+ }
+}
+
+static void dump_bitmap_mapping(BitmapMapping *bm, OutputFormat output_format,
+ int indent, FILE *stream)
+{
+ switch (output_format) {
+ case OFORMAT_JSON:
+ dump_bitmap_mapping_json(bm, indent, stream);
+ return;
+ case OFORMAT_HUMAN:
+ dump_bitmap_mapping_human(bm, stream);
+ return;
+ }
+}
+
+/* img_bitmap subcommands: dump */
+
+typedef struct BitmapOpts {
+ CommonOpts base;
+ const char *name;
+ uint32_t granularity;
+} BitmapOpts;
+
+static int bitmap_cmd_dump(BlockDriverState *bs, BitmapOpts *opts)
+{
+ BdrvDirtyBitmap *bitmap;
+ BitmapMapping *bm;
+ bool printed;
+ OutputFormat ofmt = opts->base.output_format;
+
+ if (opts->name) {
+ bitmap = bdrv_find_dirty_bitmap(bs, opts->name);
+ if (bitmap) {
+ bm = get_bitmap_mapping(bitmap);
+ dump_bitmap_mapping(bm, ofmt, 0, stdout);
+ qapi_free_BitmapMapping(bm);
+ } else {
+ if (ofmt == OFORMAT_HUMAN) {
+ fprintf(stdout, "Bitmap '%s' not found\n", opts->name);
+ }
+ }
+ } else {
+ if (ofmt == OFORMAT_JSON) {
+ fprintf(stdout, "[\n");
+ }
+ for (bitmap = NULL, printed = false;
+ (bitmap = bdrv_dirty_bitmap_next(bs, bitmap)); printed = true) {
+ if (printed) {
+ fprintf(stdout, ofmt == OFORMAT_JSON ? ",\n" : "\n");
+ }
+ bm = get_bitmap_mapping(bitmap);
+ dump_bitmap_mapping(bm, ofmt, 1, stdout);
+ qapi_free_BitmapMapping(bm);
+ }
+ if (ofmt == OFORMAT_JSON) {
+ fprintf(stdout, "%s%s", printed ? "\n" : "", "]\n");
+ }
+ if (ofmt == OFORMAT_HUMAN && printed == false) {
+ fprintf(stdout, "No bitmaps are present in this image.\n");
+ }
+ }
+
+ return 0;
+}
+
+static int img_bitmap(int argc, char **argv)
+{
+ const char *cmd;
+ BitmapOpts *opts;
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ const char *bname = NULL;
+ int flags = 0;
+ int ret = EXIT_SUCCESS;
+ int (* handler)(BlockDriverState *b, BitmapOpts *opts);
+
+ if (argc < 2) {
+ error_report("Expected a bitmap subcommand: <dump>");
+ return EXIT_FAILURE;
+ }
+ cmd = argv[1];
+ if (strcmp(cmd, "dump") == 0) {
+ handler = bitmap_cmd_dump;
+ } else {
+ error_report("Unrecognized bitmap subcommand '%s'", cmd);
+ return EXIT_FAILURE;
+ }
+
+ opts = g_new0(BitmapOpts, 1);
+ if (parse_opts_common(&opts->base, --argc, ++argv)) {
+ return EXIT_FAILURE;
+ }
+ parse_positional(argc, argv, 0, &opts->base.filename, "filename");
+ parse_positional(argc, argv, 1, &bname, "bitmap");
+ parse_unexpected(argc, argv);
+
+ blk = img_open(opts->base.image_opts, opts->base.filename, opts->base.fmt,
+ flags, false, false, opts->base.force_share);
+ if (!blk) {
+ ret = EXIT_FAILURE;
+ goto out;
+ }
+ bs = blk_bs(blk);
+
+ if (handler(bs, opts)) {
+ ret = EXIT_FAILURE;
+ }
+
+ blk_unref(blk);
+ out:
+ g_free(opts);
+ return ret;
+}
+
#define SNAPSHOT_LIST 1
#define SNAPSHOT_CREATE 2
#define SNAPSHOT_APPLY 3
--
2.14.3
[Qemu-devel] [RFC PATCH 11/12] qemu-img: add bitmap dump,
John Snow <=
[Qemu-devel] [RFC PATCH 10/12] qemu-img: split off common chunk of map command, John Snow, 2018/05/11
Re: [Qemu-devel] [RFC PATCH 00/12] qemu-img: add bitmap queries, no-reply, 2018/05/11
Re: [Qemu-devel] [RFC PATCH 00/12] qemu-img: add bitmap queries, Vladimir Sementsov-Ogievskiy, 2018/05/14