diff options
Diffstat (limited to 'block/block-backend.c')
| -rw-r--r-- | block/block-backend.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/block/block-backend.c b/block/block-backend.c index aa4adf06ae..d87ae435a7 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -138,6 +138,9 @@ static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx, GSList **ignore, Error **errp); static void blk_root_set_aio_ctx(BdrvChild *child, AioContext *ctx, GSList **ignore); +static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, + GHashTable *visited, Transaction *tran, + Error **errp); static char *blk_root_get_parent_desc(BdrvChild *child) { @@ -336,6 +339,7 @@ static const BdrvChildClass child_root = { .can_set_aio_ctx = blk_root_can_set_aio_ctx, .set_aio_ctx = blk_root_set_aio_ctx, + .change_aio_ctx = blk_root_change_aio_ctx, .get_parent_aio_context = blk_root_get_parent_aio_context, }; @@ -2177,6 +2181,54 @@ int blk_set_aio_context(BlockBackend *blk, AioContext *new_context, return blk_do_set_aio_context(blk, new_context, true, errp); } +typedef struct BdrvStateBlkRootContext { + AioContext *new_ctx; + BlockBackend *blk; +} BdrvStateBlkRootContext; + +static void blk_root_set_aio_ctx_commit(void *opaque) +{ + BdrvStateBlkRootContext *s = opaque; + BlockBackend *blk = s->blk; + + blk_do_set_aio_context(blk, s->new_ctx, false, &error_abort); +} + +static TransactionActionDrv set_blk_root_context = { + .commit = blk_root_set_aio_ctx_commit, + .clean = g_free, +}; + +static bool blk_root_change_aio_ctx(BdrvChild *child, AioContext *ctx, + GHashTable *visited, Transaction *tran, + Error **errp) +{ + BlockBackend *blk = child->opaque; + BdrvStateBlkRootContext *s; + + if (!blk->allow_aio_context_change) { + /* + * Manually created BlockBackends (those with a name) that are not + * attached to anything can change their AioContext without updating + * their user; return an error for others. + */ + if (!blk->name || blk->dev) { + /* TODO Add BB name/QOM path */ + error_setg(errp, "Cannot change iothread of active block backend"); + return false; + } + } + + s = g_new(BdrvStateBlkRootContext, 1); + *s = (BdrvStateBlkRootContext) { + .new_ctx = ctx, + .blk = blk, + }; + + tran_add(tran, &set_blk_root_context, s); + return true; +} + static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx, GSList **ignore, Error **errp) { |