diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 72 |
1 files changed, 64 insertions, 8 deletions
diff --git a/block.c b/block.c index f60606f242..0ece805e41 100644 --- a/block.c +++ b/block.c @@ -36,10 +36,10 @@ #include "qemu/main-loop.h" #include "qemu/module.h" #include "qapi/error.h" -#include "qapi/qmp/qdict.h" -#include "qapi/qmp/qjson.h" -#include "qapi/qmp/qnull.h" -#include "qapi/qmp/qstring.h" +#include "qobject/qdict.h" +#include "qobject/qjson.h" +#include "qobject/qnull.h" +#include "qobject/qstring.h" #include "qapi/qobject-output-visitor.h" #include "qapi/qapi-visit-block-core.h" #include "system/block-backend.h" @@ -1573,6 +1573,10 @@ static void update_flags_from_options(int *flags, QemuOpts *opts) if (qemu_opt_get_bool_del(opts, BDRV_OPT_AUTO_READ_ONLY, false)) { *flags |= BDRV_O_AUTO_RDONLY; } + + if (!qemu_opt_get_bool_del(opts, BDRV_OPT_ACTIVE, true)) { + *flags |= BDRV_O_INACTIVE; + } } static void update_options_from_flags(QDict *options, int flags) @@ -1800,6 +1804,11 @@ QemuOptsList bdrv_runtime_opts = { .help = "Ignore flush requests", }, { + .name = BDRV_OPT_ACTIVE, + .type = QEMU_OPT_BOOL, + .help = "Node is activated", + }, + { .name = BDRV_OPT_READ_ONLY, .type = QEMU_OPT_BOOL, .help = "Node is opened in read-only mode", @@ -3077,6 +3086,13 @@ bdrv_attach_child_common(BlockDriverState *child_bs, assert(child_class->get_parent_desc); GLOBAL_STATE_CODE(); + if (bdrv_is_inactive(child_bs) && (perm & ~BLK_PERM_CONSISTENT_READ)) { + g_autofree char *perm_names = bdrv_perm_names(perm); + error_setg(errp, "Permission '%s' unavailable on inactive node", + perm_names); + return NULL; + } + new_child = g_new(BdrvChild, 1); *new_child = (BdrvChild) { .bs = NULL, @@ -3183,6 +3199,11 @@ bdrv_attach_child_noperm(BlockDriverState *parent_bs, child_bs->node_name, child_name, parent_bs->node_name); return NULL; } + if (bdrv_is_inactive(child_bs) && !bdrv_is_inactive(parent_bs)) { + error_setg(errp, "Inactive '%s' can't be a %s child of active '%s'", + child_bs->node_name, child_name, parent_bs->node_name); + return NULL; + } bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL, @@ -6824,6 +6845,10 @@ void bdrv_init_with_whitelist(void) bdrv_init(); } +bool bdrv_is_inactive(BlockDriverState *bs) { + return bs->open_flags & BDRV_O_INACTIVE; +} + int bdrv_activate(BlockDriverState *bs, Error **errp) { BdrvChild *child, *parent; @@ -6955,7 +6980,8 @@ bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) return false; } -static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) +static int GRAPH_RDLOCK +bdrv_inactivate_recurse(BlockDriverState *bs, bool top_level) { BdrvChild *child, *parent; int ret; @@ -6973,7 +6999,14 @@ static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) return 0; } - assert(!(bs->open_flags & BDRV_O_INACTIVE)); + /* + * Inactivating an already inactive node on user request is harmless, but if + * a child is already inactive before its parent, that's bad. + */ + if (bs->open_flags & BDRV_O_INACTIVE) { + assert(top_level); + return 0; + } /* Inactivate this node */ if (bs->drv->bdrv_inactivate) { @@ -6999,7 +7032,9 @@ static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) return -EPERM; } + bdrv_drained_begin(bs); bs->open_flags |= BDRV_O_INACTIVE; + bdrv_drained_end(bs); /* * Update permissions, they may differ for inactive nodes. @@ -7010,7 +7045,7 @@ static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) /* Recursively inactivate children */ QLIST_FOREACH(child, &bs->children, next) { - ret = bdrv_inactivate_recurse(child->bs); + ret = bdrv_inactivate_recurse(child->bs, false); if (ret < 0) { return ret; } @@ -7019,6 +7054,27 @@ static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) return 0; } +int bdrv_inactivate(BlockDriverState *bs, Error **errp) +{ + int ret; + + GLOBAL_STATE_CODE(); + GRAPH_RDLOCK_GUARD_MAINLOOP(); + + if (bdrv_has_bds_parent(bs, true)) { + error_setg(errp, "Node has active parent node"); + return -EPERM; + } + + ret = bdrv_inactivate_recurse(bs, true); + if (ret < 0) { + error_setg_errno(errp, -ret, "Failed to inactivate node"); + return ret; + } + + return 0; +} + int bdrv_inactivate_all(void) { BlockDriverState *bs = NULL; @@ -7035,7 +7091,7 @@ int bdrv_inactivate_all(void) if (bdrv_has_bds_parent(bs, false)) { continue; } - ret = bdrv_inactivate_recurse(bs); + ret = bdrv_inactivate_recurse(bs, true); if (ret < 0) { bdrv_next_cleanup(&it); break; |