diff options
| -rw-r--r-- | block.c | 23 | ||||
| -rw-r--r-- | include/block/block_int.h | 8 |
2 files changed, 31 insertions, 0 deletions
@@ -1537,6 +1537,29 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, return 0; } +#define DEFAULT_PERM_PASSTHROUGH (BLK_PERM_CONSISTENT_READ \ + | BLK_PERM_WRITE \ + | BLK_PERM_WRITE_UNCHANGED \ + | BLK_PERM_RESIZE) +#define DEFAULT_PERM_UNCHANGED (BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH) + +void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, + const BdrvChildRole *role, + uint64_t perm, uint64_t shared, + uint64_t *nperm, uint64_t *nshared) +{ + if (c == NULL) { + *nperm = perm & DEFAULT_PERM_PASSTHROUGH; + *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; + return; + } + + *nperm = (perm & DEFAULT_PERM_PASSTHROUGH) | + (c->perm & DEFAULT_PERM_UNCHANGED); + *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | + (c->shared_perm & DEFAULT_PERM_UNCHANGED); +} + static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs, bool check_new_perm) { diff --git a/include/block/block_int.h b/include/block/block_int.h index cef2b6e0bc..17f4c2d6cd 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -872,6 +872,14 @@ void bdrv_child_abort_perm_update(BdrvChild *c); int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, Error **errp); +/* Default implementation for BlockDriver.bdrv_child_perm() that can be used by + * block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to + * all children */ +void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, + const BdrvChildRole *role, + uint64_t perm, uint64_t shared, + uint64_t *nperm, uint64_t *nshared); + const char *bdrv_get_parent_name(const BlockDriverState *bs); void blk_dev_change_media_cb(BlockBackend *blk, bool load); |