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Diffstat (limited to 'blockdev.c')
-rw-r--r--blockdev.c167
1 files changed, 16 insertions, 151 deletions
diff --git a/blockdev.c b/blockdev.c
index 3e44fa766b..fa8630cb41 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -64,9 +64,14 @@
#include "qemu/main-loop.h"
#include "qemu/throttle-options.h"
-static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
+QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
+void bdrv_set_monitor_owned(BlockDriverState *bs)
+{
+ QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
+}
+
static const char *const if_name[IF_COUNT] = {
[IF_NONE] = "none",
[IF_IDE] = "ide",
@@ -640,7 +645,7 @@ err_no_opts:
}
/* Takes the ownership of bs_opts */
-static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
+BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
{
int bdrv_flags = 0;
@@ -1039,41 +1044,6 @@ static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
return bs;
}
-void hmp_commit(Monitor *mon, const QDict *qdict)
-{
- const char *device = qdict_get_str(qdict, "device");
- BlockBackend *blk;
- int ret;
-
- if (!strcmp(device, "all")) {
- ret = blk_commit_all();
- } else {
- BlockDriverState *bs;
- AioContext *aio_context;
-
- blk = blk_by_name(device);
- if (!blk) {
- error_report("Device '%s' not found", device);
- return;
- }
- if (!blk_is_available(blk)) {
- error_report("Device '%s' has no medium", device);
- return;
- }
-
- bs = blk_bs(blk);
- aio_context = bdrv_get_aio_context(bs);
- aio_context_acquire(aio_context);
-
- ret = bdrv_commit(bs);
-
- aio_context_release(aio_context);
- }
- if (ret < 0) {
- error_report("'commit' error for '%s': %s", device, strerror(-ret));
- }
-}
-
static void blockdev_do_action(TransactionAction *action, Error **errp)
{
TransactionActionList list;
@@ -1500,8 +1470,7 @@ static void external_snapshot_prepare(BlkActionState *common,
DO_UPCAST(ExternalSnapshotState, common, common);
TransactionAction *action = common->action;
AioContext *aio_context;
- AioContext *old_context;
- int ret;
+ uint64_t perm, shared;
/* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
* purpose but a different set of parameters */
@@ -1616,16 +1585,17 @@ static void external_snapshot_prepare(BlkActionState *common,
goto out;
}
- if (bdrv_has_blk(state->new_bs)) {
+ /*
+ * Allow attaching a backing file to an overlay that's already in use only
+ * if the parents don't assume that they are already seeing a valid image.
+ * (Specifically, allow it as a mirror target, which is write-only access.)
+ */
+ bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
+ if (perm & BLK_PERM_CONSISTENT_READ) {
error_setg(errp, "The overlay is already in use");
goto out;
}
- if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
- errp)) {
- goto out;
- }
-
if (state->new_bs->backing != NULL) {
error_setg(errp, "The overlay already has a backing image");
goto out;
@@ -1636,20 +1606,6 @@ static void external_snapshot_prepare(BlkActionState *common,
goto out;
}
- /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
- old_context = bdrv_get_aio_context(state->new_bs);
- aio_context_release(aio_context);
- aio_context_acquire(old_context);
-
- ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp);
-
- aio_context_release(old_context);
- aio_context_acquire(aio_context);
-
- if (ret < 0) {
- goto out;
- }
-
/* This removes our old bs and adds the new bs. This is an operation that
* can fail, so we need to do it in .prepare; undoing it for abort is
* always possible. */
@@ -2747,66 +2703,6 @@ BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
return ret;
}
-void hmp_drive_del(Monitor *mon, const QDict *qdict)
-{
- const char *id = qdict_get_str(qdict, "id");
- BlockBackend *blk;
- BlockDriverState *bs;
- AioContext *aio_context;
- Error *local_err = NULL;
-
- bs = bdrv_find_node(id);
- if (bs) {
- qmp_blockdev_del(id, &local_err);
- if (local_err) {
- error_report_err(local_err);
- }
- return;
- }
-
- blk = blk_by_name(id);
- if (!blk) {
- error_report("Device '%s' not found", id);
- return;
- }
-
- if (!blk_legacy_dinfo(blk)) {
- error_report("Deleting device added with blockdev-add"
- " is not supported");
- return;
- }
-
- aio_context = blk_get_aio_context(blk);
- aio_context_acquire(aio_context);
-
- bs = blk_bs(blk);
- if (bs) {
- if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
- error_report_err(local_err);
- aio_context_release(aio_context);
- return;
- }
-
- blk_remove_bs(blk);
- }
-
- /* Make the BlockBackend and the attached BlockDriverState anonymous */
- monitor_remove_blk(blk);
-
- /* If this BlockBackend has a device attached to it, its refcount will be
- * decremented when the device is removed; otherwise we have to do so here.
- */
- if (blk_get_attached_dev(blk)) {
- /* Further I/O must not pause the guest */
- blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
- BLOCKDEV_ON_ERROR_REPORT);
- } else {
- blk_unref(blk);
- }
-
- aio_context_release(aio_context);
-}
-
void qmp_block_resize(bool has_device, const char *device,
bool has_node_name, const char *node_name,
int64_t size, Error **errp)
@@ -3814,37 +3710,6 @@ out:
aio_context_release(aio_context);
}
-void hmp_drive_add_node(Monitor *mon, const char *optstr)
-{
- QemuOpts *opts;
- QDict *qdict;
- Error *local_err = NULL;
-
- opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
- if (!opts) {
- return;
- }
-
- qdict = qemu_opts_to_qdict(opts, NULL);
-
- if (!qdict_get_try_str(qdict, "node-name")) {
- qobject_unref(qdict);
- error_report("'node-name' needs to be specified");
- goto out;
- }
-
- BlockDriverState *bs = bds_tree_init(qdict, &local_err);
- if (!bs) {
- error_report_err(local_err);
- goto out;
- }
-
- QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
-
-out:
- qemu_opts_del(opts);
-}
-
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
BlockDriverState *bs;
@@ -3874,7 +3739,7 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
goto fail;
}
- QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
+ bdrv_set_monitor_owned(bs);
fail:
visit_free(v);
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-18 10:00:00 +0000