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nbd: Simplify qemu bitmap context name 

Each dirty bitmap already knows its name; by reducing the scope of the
places where we construct "qemu:dirty-bitmap:NAME" strings, tracking
the name is more localized, and there are fewer per-export fields to
worry about.  This in turn will make it easier for an upcoming patch
to export more than one bitmap at once.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201027050556.269064-6-eblake@redhat.com>
This commit is contained in:
Eric Blake 2020-10-27 00:05:50 -05:00
parent cbad81cef8
commit 02e87e3b1c
1 changed files with 9 additions and 10 deletions
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19
nbd/server.c
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@ -95,7 +95,6 @@ struct NBDExport {
Notifier eject_notifier;
BdrvDirtyBitmap *export_bitmap;
char *export_bitmap_context;
};
static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
@ -871,14 +870,15 @@ static bool nbd_meta_qemu_query(NBDClient *client, NBDExportMetaContexts *meta,
}
if (nbd_strshift(&query, "dirty-bitmap:")) {
const char *bm_name;
trace_nbd_negotiate_meta_query_parse("dirty-bitmap:");
if (!meta->exp->export_bitmap) {
trace_nbd_negotiate_meta_query_skip("no dirty-bitmap exported");
return true;
}
if (nbd_meta_empty_or_pattern(client,
meta->exp->export_bitmap_context +
strlen("qemu:dirty-bitmap:"), query)) {
bm_name = bdrv_dirty_bitmap_name(meta->exp->export_bitmap);
if (nbd_meta_empty_or_pattern(client, bm_name, query)) {
meta->bitmap = true;
}
return true;
@ -1004,8 +1004,11 @@ static int nbd_negotiate_meta_queries(NBDClient *client,
}
if (meta->bitmap) {
ret = nbd_negotiate_send_meta_context(client,
meta->exp->export_bitmap_context,
const char *bm_name = bdrv_dirty_bitmap_name(meta->exp->export_bitmap);
g_autofree char *context = g_strdup_printf("qemu:dirty-bitmap:%s",
bm_name);
ret = nbd_negotiate_send_meta_context(client, context,
NBD_META_ID_DIRTY_BITMAP,
errp);
if (ret < 0) {
@ -1576,9 +1579,6 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args,
bdrv_dirty_bitmap_set_busy(bm, true);
exp->export_bitmap = bm;
assert(strlen(bitmap) <= BDRV_BITMAP_MAX_NAME_SIZE);
exp->export_bitmap_context = g_strdup_printf("qemu:dirty-bitmap:%s",
bitmap);
assert(strlen(exp->export_bitmap_context) < NBD_MAX_STRING_SIZE);
}
blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp);
@ -1656,7 +1656,6 @@ static void nbd_export_delete(BlockExport *blk_exp)
if (exp->export_bitmap) {
bdrv_dirty_bitmap_set_busy(exp->export_bitmap, false);
g_free(exp->export_bitmap_context);
}
}