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#include "crimson/common/coroutine.h"
#include "crimson/osd/object_context_loader.h"
#include "osd/osd_types_fmt.h"
#include "osd/object_state_fmt.h"
SET_SUBSYS(osd);
namespace crimson::osd {
using crimson::common::local_conf;
ObjectContextLoader::load_and_lock_fut
ObjectContextLoader::load_and_lock_head(Manager &manager, RWState::State lock_type)
{
LOG_PREFIX(ObjectContextLoader::load_and_lock_head);
DEBUGDPP("{} {}", dpp, manager.target, lock_type);
auto releaser = manager.get_releaser();
ceph_assert(manager.target.is_head());
if (manager.head_state.is_empty()) {
auto [obc, _] = obc_registry.get_cached_obc(manager.target);
manager.set_state_obc(manager.head_state, obc);
}
ceph_assert(manager.target_state.is_empty());
manager.set_state_obc(manager.target_state, manager.head_state.obc);
if (manager.target_state.obc->loading_started) {
co_await manager.target_state.lock_to(lock_type);
} else {
manager.target_state.lock_excl_sync();
manager.target_state.obc->loading_started = true;
co_await load_obc(manager.target_state.obc);
manager.target_state.demote_excl_to(lock_type);
}
releaser.cancel();
}
ObjectContextLoader::load_and_lock_fut
ObjectContextLoader::load_and_lock_clone(
Manager &manager, RWState::State lock_type, bool lock_head)
{
LOG_PREFIX(ObjectContextLoader::load_and_lock_clone);
DEBUGDPP("{} {}", dpp, manager.target, lock_type);
auto releaser = manager.get_releaser();
ceph_assert(!manager.target.is_head());
ceph_assert(manager.target_state.is_empty());
if (manager.head_state.is_empty()) {
auto [obc, _] = obc_registry.get_cached_obc(manager.target.get_head());
manager.set_state_obc(manager.head_state, obc);
}
if (!manager.head_state.obc->loading_started) {
// caller is responsible for pre-populating a loaded obc if lock_head is
// false
ceph_assert(lock_head);
manager.head_state.lock_excl_sync();
manager.head_state.obc->loading_started = true;
co_await load_obc(manager.head_state.obc);
manager.head_state.demote_excl_to(RWState::RWREAD);
} else if (lock_head) {
co_await manager.head_state.lock_to(RWState::RWREAD);
}
if (manager.options.resolve_clone) {
auto resolved_oid = resolve_oid(
manager.head_state.obc->get_head_ss(),
manager.target);
if (!resolved_oid) {
ERRORDPP("clone {} not found", dpp, manager.target);
co_await load_obc_iertr::future<>(
crimson::ct_error::enoent::make()
);
}
// note: might be head if snap was taken after most recent write!
manager.target = *resolved_oid;
}
if (manager.target.is_head()) {
/* Yes, we assert at the top that manager.target is not head. However, it's
* possible that the requested snap (the resolve_clone path above) actually
* maps to head (a read on an rbd snapshot more recent than the most recent
* write on this specific rbd block, for example).
*
* In such an event, it's hypothetically possible that lock_type isn't
* RWREAD, in which case we need to drop and reacquire the lock. However,
* this case is at present impossible. Actual client requests cannot write
* to a snapshot and will therefore always be RWREAD. The pathways that
* actually can mutate a clone do not set resolve_clone, so target will not
* become head here.
*/
manager.set_state_obc(manager.target_state, manager.head_state.obc);
if (lock_type != manager.head_state.state) {
// This case isn't actually possible at the moment for the above reason.
manager.head_state.release_lock();
co_await manager.target_state.lock_to(lock_type);
} else {
manager.target_state.state = manager.head_state.state;
manager.head_state.state = RWState::RWNONE;
}
} else {
auto [obc, _] = obc_registry.get_cached_obc(manager.target);
manager.set_state_obc(manager.target_state, obc);
if (manager.target_state.obc->loading_started) {
co_await manager.target_state.lock_to(RWState::RWREAD);
} else {
manager.target_state.lock_excl_sync();
manager.target_state.obc->loading_started = true;
co_await load_obc(manager.target_state.obc);
manager.target_state.obc->set_clone_ssc(manager.head_state.obc->ssc);
manager.target_state.demote_excl_to(RWState::RWREAD);
}
}
releaser.cancel();
}
ObjectContextLoader::load_and_lock_fut
ObjectContextLoader::load_and_lock(Manager &manager, RWState::State lock_type)
{
LOG_PREFIX(ObjectContextLoader::load_and_lock);
DEBUGDPP("{} {}", dpp, manager.target, lock_type);
if (manager.target.is_head()) {
return load_and_lock_head(manager, lock_type);
} else {
return load_and_lock_clone(manager, lock_type);
}
}
ObjectContextLoader::load_obc_iertr::future<>
ObjectContextLoader::load_obc(ObjectContextRef obc)
{
LOG_PREFIX(ObjectContextLoader::load_obc);
return backend.load_metadata(obc->get_oid())
.safe_then_interruptible(
[FNAME, this, obc=std::move(obc)](auto md)
-> load_obc_ertr::future<> {
const hobject_t& oid = md->os.oi.soid;
DEBUGDPP("loaded obs {} for {}", dpp, md->os.oi, oid);
if (oid.is_head()) {
if (!md->ssc) {
ERRORDPP("oid {} missing snapsetcontext", dpp, oid);
return crimson::ct_error::object_corrupted::make();
}
obc->set_head_state(std::move(md->os),
std::move(md->ssc));
} else {
// we load and set the ssc only for head obc.
// For clones, the head's ssc will be referenced later.
// See set_clone_ssc
obc->set_clone_state(std::move(md->os));
}
DEBUGDPP("loaded obc {} for {}", dpp, obc->obs.oi, obc->obs.oi.soid);
return seastar::now();
});
}
void ObjectContextLoader::notify_on_change(bool is_primary)
{
LOG_PREFIX(ObjectContextLoader::notify_on_change);
DEBUGDPP("is_primary: {}", dpp, is_primary);
for (auto& obc : obc_set_accessing) {
DEBUGDPP("interrupting obc: {}", dpp, obc.get_oid());
obc.interrupt(::crimson::common::actingset_changed(is_primary));
}
}
}
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