diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/block.c b/block.c index 6720bc4f8a..186efda70f 100644 --- a/block.c +++ b/block.c @@ -2320,7 +2320,7 @@ static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, tran_add(tran, &bdrv_child_set_pem_drv, s); } -static void bdrv_drv_set_perm_commit(void *opaque) +static void GRAPH_RDLOCK bdrv_drv_set_perm_commit(void *opaque) { BlockDriverState *bs = opaque; uint64_t cumulative_perms, cumulative_shared_perms; @@ -2333,7 +2333,7 @@ static void bdrv_drv_set_perm_commit(void *opaque) } } -static void bdrv_drv_set_perm_abort(void *opaque) +static void GRAPH_RDLOCK bdrv_drv_set_perm_abort(void *opaque) { BlockDriverState *bs = opaque; GLOBAL_STATE_CODE(); @@ -2348,9 +2348,13 @@ TransactionActionDrv bdrv_drv_set_perm_drv = { .commit = bdrv_drv_set_perm_commit, }; -static int bdrv_drv_set_perm(BlockDriverState *bs, uint64_t perm, - uint64_t shared_perm, Transaction *tran, - Error **errp) +/* + * After calling this function, the transaction @tran may only be completed + * while holding a reader lock for the graph. + */ +static int GRAPH_RDLOCK +bdrv_drv_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared_perm, + Transaction *tran, Error **errp) { GLOBAL_STATE_CODE(); if (!bs->drv) { @@ -2457,9 +2461,13 @@ bdrv_replace_child_tran(BdrvChild *child, BlockDriverState *new_bs, /* * Refresh permissions in @bs subtree. The function is intended to be called * after some graph modification that was done without permission update. + * + * After calling this function, the transaction @tran may only be completed + * while holding a reader lock for the graph. */ -static int bdrv_node_refresh_perm(BlockDriverState *bs, BlockReopenQueue *q, - Transaction *tran, Error **errp) +static int GRAPH_RDLOCK +bdrv_node_refresh_perm(BlockDriverState *bs, BlockReopenQueue *q, + Transaction *tran, Error **errp) { BlockDriver *drv = bs->drv; BdrvChild *c; @@ -2532,6 +2540,9 @@ static int bdrv_node_refresh_perm(BlockDriverState *bs, BlockReopenQueue *q, /* * @list is a product of bdrv_topological_dfs() (may be called several times) - * a topologically sorted subgraph. + * + * After calling this function, the transaction @tran may only be completed + * while holding a reader lock for the graph. */ static int GRAPH_RDLOCK bdrv_do_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, @@ -2561,6 +2572,9 @@ bdrv_do_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, * @list is any list of nodes. List is completed by all subtrees and * topologically sorted. It's not a problem if some node occurs in the @list * several times. + * + * After calling this function, the transaction @tran may only be completed + * while holding a reader lock for the graph. */ static int GRAPH_RDLOCK bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, @@ -2623,7 +2637,12 @@ char *bdrv_perm_names(uint64_t perm) } -/* @tran is allowed to be NULL. In this case no rollback is possible */ +/* + * @tran is allowed to be NULL. In this case no rollback is possible. + * + * After calling this function, the transaction @tran may only be completed + * while holding a reader lock for the graph. + */ static int GRAPH_RDLOCK bdrv_refresh_perms(BlockDriverState *bs, Transaction *tran, Error **errp) { |