diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 133 |
1 files changed, 60 insertions, 73 deletions
diff --git a/block.c b/block.c index 59a18a3a66..b4107fcd4c 100644 --- a/block.c +++ b/block.c @@ -55,8 +55,6 @@ #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ -struct BdrvStates bdrv_states = QTAILQ_HEAD_INITIALIZER(bdrv_states); - static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); @@ -226,10 +224,7 @@ void bdrv_register(BlockDriver *bdrv) BlockDriverState *bdrv_new_root(void) { - BlockDriverState *bs = bdrv_new(); - - QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); - return bs; + return bdrv_new(); } BlockDriverState *bdrv_new(void) @@ -1180,10 +1175,9 @@ static int bdrv_fill_options(QDict **options, const char *filename, return 0; } -static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, - BlockDriverState *child_bs, - const char *child_name, - const BdrvChildRole *child_role) +BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, + const char *child_name, + const BdrvChildRole *child_role) { BdrvChild *child = g_new(BdrvChild, 1); *child = (BdrvChild) { @@ -1192,24 +1186,43 @@ static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, .role = child_role, }; - QLIST_INSERT_HEAD(&parent_bs->children, child, next); QLIST_INSERT_HEAD(&child_bs->parents, child, next_parent); return child; } +static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, + BlockDriverState *child_bs, + const char *child_name, + const BdrvChildRole *child_role) +{ + BdrvChild *child = bdrv_root_attach_child(child_bs, child_name, child_role); + QLIST_INSERT_HEAD(&parent_bs->children, child, next); + return child; +} + static void bdrv_detach_child(BdrvChild *child) { - QLIST_REMOVE(child, next); + if (child->next.le_prev) { + QLIST_REMOVE(child, next); + child->next.le_prev = NULL; + } QLIST_REMOVE(child, next_parent); g_free(child->name); g_free(child); } -void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) +void bdrv_root_unref_child(BdrvChild *child) { BlockDriverState *child_bs; + child_bs = child->bs; + bdrv_detach_child(child); + bdrv_unref(child_bs); +} + +void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) +{ if (child == NULL) { return; } @@ -1218,9 +1231,7 @@ void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) child->bs->inherits_from = NULL; } - child_bs = child->bs; - bdrv_detach_child(child); - bdrv_unref(child_bs); + bdrv_root_unref_child(child); } /* @@ -1671,9 +1682,9 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, error_setg(errp, "Block protocol '%s' doesn't support the option " "'%s'", drv->format_name, entry->key); } else { - error_setg(errp, "Block format '%s' used by device '%s' doesn't " - "support the option '%s'", drv->format_name, - bdrv_get_device_name(bs), entry->key); + error_setg(errp, + "Block format '%s' does not support the option '%s'", + drv->format_name, entry->key); } ret = -EINVAL; @@ -2230,26 +2241,10 @@ void bdrv_close_all(void) } } -/* Note that bs->device_list.tqe_prev is initially null, - * and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish - * the useful invariant "bs in bdrv_states iff bs->tqe_prev" by - * resetting it to null on remove. */ -void bdrv_device_remove(BlockDriverState *bs) -{ - QTAILQ_REMOVE(&bdrv_states, bs, device_list); - bs->device_list.tqe_prev = NULL; -} - -/* make a BlockDriverState anonymous by removing from bdrv_state and - * graph_bdrv_state list. - Also, NULL terminate the device_name to prevent double remove */ +/* make a BlockDriverState anonymous by removing from graph_bdrv_state list. + * Also, NULL terminate the device_name to prevent double remove */ void bdrv_make_anon(BlockDriverState *bs) { - /* Take care to remove bs from bdrv_states only when it's actually - * in it. */ - if (bs->device_list.tqe_prev) { - bdrv_device_remove(bs); - } if (bs->node_name[0] != '\0') { QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); } @@ -2276,6 +2271,14 @@ static void change_parent_backing_link(BlockDriverState *from, { BdrvChild *c, *next; + if (from->blk) { + /* FIXME We bypass blk_set_bs(), so we need to make these updates + * manually. The root problem is not in this change function, but the + * existence of BlockDriverState.blk. */ + to->blk = from->blk; + from->blk = NULL; + } + QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { assert(c->role != &child_backing); c->bs = to; @@ -2284,13 +2287,6 @@ static void change_parent_backing_link(BlockDriverState *from, bdrv_ref(to); bdrv_unref(from); } - if (from->blk) { - blk_set_bs(from->blk, to); - if (!to->device_list.tqe_prev) { - QTAILQ_INSERT_BEFORE(from, to, device_list); - } - bdrv_device_remove(from); - } } static void swap_feature_fields(BlockDriverState *bs_top, @@ -2521,26 +2517,6 @@ ro_cleanup: return ret; } -int bdrv_commit_all(void) -{ - BlockDriverState *bs; - - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { - AioContext *aio_context = bdrv_get_aio_context(bs); - - aio_context_acquire(aio_context); - if (bs->drv && bs->backing) { - int ret = bdrv_commit(bs); - if (ret < 0) { - aio_context_release(aio_context); - return ret; - } - } - aio_context_release(aio_context); - } - return 0; -} - /* * Return values: * 0 - success @@ -2989,12 +2965,23 @@ BlockDriverState *bdrv_next_node(BlockDriverState *bs) return QTAILQ_NEXT(bs, node_list); } +/* Iterates over all top-level BlockDriverStates, i.e. BDSs that are owned by + * the monitor or attached to a BlockBackend */ BlockDriverState *bdrv_next(BlockDriverState *bs) { - if (!bs) { - return QTAILQ_FIRST(&bdrv_states); + if (!bs || bs->blk) { + bs = blk_next_root_bs(bs); + if (bs) { + return bs; + } } - return QTAILQ_NEXT(bs, device_list); + + /* Ignore all BDSs that are attached to a BlockBackend here; they have been + * handled by the above block already */ + do { + bs = bdrv_next_monitor_owned(bs); + } while (bs && bs->blk); + return bs; } const char *bdrv_get_node_name(const BlockDriverState *bs) @@ -3302,10 +3289,10 @@ void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) void bdrv_invalidate_cache_all(Error **errp) { - BlockDriverState *bs; + BlockDriverState *bs = NULL; Error *local_err = NULL; - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { + while ((bs = bdrv_next(bs)) != NULL) { AioContext *aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); @@ -3335,10 +3322,10 @@ static int bdrv_inactivate(BlockDriverState *bs) int bdrv_inactivate_all(void) { - BlockDriverState *bs; + BlockDriverState *bs = NULL; int ret; - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { + while ((bs = bdrv_next(bs)) != NULL) { AioContext *aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); @@ -3844,10 +3831,10 @@ bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, */ bool bdrv_is_first_non_filter(BlockDriverState *candidate) { - BlockDriverState *bs; + BlockDriverState *bs = NULL; /* walk down the bs forest recursively */ - QTAILQ_FOREACH(bs, &bdrv_states, device_list) { + while ((bs = bdrv_next(bs)) != NULL) { bool perm; /* try to recurse in this top level bs */ |