--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/io/ImageRequestWQ.h"
+#include "common/errno.h"
+#include "common/zipkin_trace.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/internal.h"
+#include "librbd/Utils.h"
+#include "librbd/exclusive_lock/Policy.h"
+#include "librbd/io/AioCompletion.h"
+#include "librbd/io/ImageRequest.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::io::ImageRequestWQ: " << this \
+ << " " << __func__ << ": "
+
+namespace librbd {
+namespace io {
+
+template <typename I>
+struct ImageRequestWQ<I>::C_AcquireLock : public Context {
+ ImageRequestWQ *work_queue;
+ ImageRequest<I> *image_request;
+
+ C_AcquireLock(ImageRequestWQ *work_queue, ImageRequest<I> *image_request)
+ : work_queue(work_queue), image_request(image_request) {
+ }
+
+ void finish(int r) override {
+ work_queue->handle_acquire_lock(r, image_request);
+ }
+};
+
+template <typename I>
+struct ImageRequestWQ<I>::C_BlockedWrites : public Context {
+ ImageRequestWQ *work_queue;
+ C_BlockedWrites(ImageRequestWQ *_work_queue)
+ : work_queue(_work_queue) {
+ }
+
+ void finish(int r) override {
+ work_queue->handle_blocked_writes(r);
+ }
+};
+
+template <typename I>
+struct ImageRequestWQ<I>::C_RefreshFinish : public Context {
+ ImageRequestWQ *work_queue;
+ ImageRequest<I> *image_request;
+
+ C_RefreshFinish(ImageRequestWQ *work_queue,
+ ImageRequest<I> *image_request)
+ : work_queue(work_queue), image_request(image_request) {
+ }
+ void finish(int r) override {
+ work_queue->handle_refreshed(r, image_request);
+ }
+};
+
+template <typename I>
+ImageRequestWQ<I>::ImageRequestWQ(I *image_ctx, const string &name,
+ time_t ti, ThreadPool *tp)
+ : ThreadPool::PointerWQ<ImageRequest<I> >(name, ti, 0, tp),
+ m_image_ctx(*image_ctx),
+ m_lock(util::unique_lock_name("ImageRequestWQ<I>::m_lock", this)) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << "ictx=" << image_ctx << dendl;
+ this->register_work_queue();
+}
+
+template <typename I>
+ssize_t ImageRequestWQ<I>::read(uint64_t off, uint64_t len,
+ ReadResult &&read_result, int op_flags) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", off=" << off << ", "
+ << "len = " << len << dendl;
+
+ C_SaferCond cond;
+ AioCompletion *c = AioCompletion::create(&cond);
+ aio_read(c, off, len, std::move(read_result), op_flags, false);
+ return cond.wait();
+}
+
+template <typename I>
+ssize_t ImageRequestWQ<I>::write(uint64_t off, uint64_t len,
+ bufferlist &&bl, int op_flags) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", off=" << off << ", "
+ << "len = " << len << dendl;
+
+ m_image_ctx.snap_lock.get_read();
+ int r = clip_io(util::get_image_ctx(&m_image_ctx), off, &len);
+ m_image_ctx.snap_lock.put_read();
+ if (r < 0) {
+ lderr(cct) << "invalid IO request: " << cpp_strerror(r) << dendl;
+ return r;
+ }
+
+ C_SaferCond cond;
+ AioCompletion *c = AioCompletion::create(&cond);
+ aio_write(c, off, len, std::move(bl), op_flags, false);
+
+ r = cond.wait();
+ if (r < 0) {
+ return r;
+ }
+ return len;
+}
+
+template <typename I>
+ssize_t ImageRequestWQ<I>::discard(uint64_t off, uint64_t len,
+ bool skip_partial_discard) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", off=" << off << ", "
+ << "len = " << len << dendl;
+
+ m_image_ctx.snap_lock.get_read();
+ int r = clip_io(util::get_image_ctx(&m_image_ctx), off, &len);
+ m_image_ctx.snap_lock.put_read();
+ if (r < 0) {
+ lderr(cct) << "invalid IO request: " << cpp_strerror(r) << dendl;
+ return r;
+ }
+
+ C_SaferCond cond;
+ AioCompletion *c = AioCompletion::create(&cond);
+ aio_discard(c, off, len, skip_partial_discard, false);
+
+ r = cond.wait();
+ if (r < 0) {
+ return r;
+ }
+ return len;
+}
+
+template <typename I>
+ssize_t ImageRequestWQ<I>::writesame(uint64_t off, uint64_t len,
+ bufferlist &&bl, int op_flags) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", off=" << off << ", "
+ << "len = " << len << ", data_len " << bl.length() << dendl;
+
+ m_image_ctx.snap_lock.get_read();
+ int r = clip_io(util::get_image_ctx(&m_image_ctx), off, &len);
+ m_image_ctx.snap_lock.put_read();
+ if (r < 0) {
+ lderr(cct) << "invalid IO request: " << cpp_strerror(r) << dendl;
+ return r;
+ }
+
+ C_SaferCond cond;
+ AioCompletion *c = AioCompletion::create(&cond);
+ aio_writesame(c, off, len, std::move(bl), op_flags, false);
+
+ r = cond.wait();
+ if (r < 0) {
+ return r;
+ }
+ return len;
+}
+
+template <typename I>
+ssize_t ImageRequestWQ<I>::compare_and_write(uint64_t off, uint64_t len,
+ bufferlist &&cmp_bl,
+ bufferlist &&bl,
+ uint64_t *mismatch_off,
+ int op_flags){
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "compare_and_write ictx=" << &m_image_ctx << ", off="
+ << off << ", " << "len = " << len << dendl;
+
+ m_image_ctx.snap_lock.get_read();
+ int r = clip_io(util::get_image_ctx(&m_image_ctx), off, &len);
+ m_image_ctx.snap_lock.put_read();
+ if (r < 0) {
+ lderr(cct) << "invalid IO request: " << cpp_strerror(r) << dendl;
+ return r;
+ }
+
+ C_SaferCond cond;
+ AioCompletion *c = AioCompletion::create(&cond);
+ aio_compare_and_write(c, off, len, std::move(cmp_bl), std::move(bl),
+ mismatch_off, op_flags, false);
+
+ r = cond.wait();
+ if (r < 0) {
+ return r;
+ }
+
+ return len;
+}
+
+template <typename I>
+void ImageRequestWQ<I>::aio_read(AioCompletion *c, uint64_t off, uint64_t len,
+ ReadResult &&read_result, int op_flags,
+ bool native_async) {
+ CephContext *cct = m_image_ctx.cct;
+ ZTracer::Trace trace;
+ if (m_image_ctx.blkin_trace_all) {
+ trace.init("wq: read", &m_image_ctx.trace_endpoint);
+ trace.event("start");
+ }
+
+ c->init_time(util::get_image_ctx(&m_image_ctx), AIO_TYPE_READ);
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "completion=" << c << ", off=" << off << ", "
+ << "len=" << len << ", " << "flags=" << op_flags << dendl;
+
+ if (native_async && m_image_ctx.event_socket.is_valid()) {
+ c->set_event_notify(true);
+ }
+
+ if (!start_in_flight_io(c)) {
+ return;
+ }
+
+ // if journaling is enabled -- we need to replay the journal because
+ // it might contain an uncommitted write
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.non_blocking_aio || writes_blocked() || !writes_empty() ||
+ require_lock_on_read()) {
+ queue(ImageRequest<I>::create_read_request(
+ m_image_ctx, c, {{off, len}}, std::move(read_result), op_flags,
+ trace));
+ } else {
+ c->start_op();
+ ImageRequest<I>::aio_read(&m_image_ctx, c, {{off, len}},
+ std::move(read_result), op_flags, trace);
+ finish_in_flight_io();
+ }
+ trace.event("finish");
+}
+
+template <typename I>
+void ImageRequestWQ<I>::aio_write(AioCompletion *c, uint64_t off, uint64_t len,
+ bufferlist &&bl, int op_flags,
+ bool native_async) {
+ CephContext *cct = m_image_ctx.cct;
+ ZTracer::Trace trace;
+ if (m_image_ctx.blkin_trace_all) {
+ trace.init("wq: write", &m_image_ctx.trace_endpoint);
+ trace.event("init");
+ }
+
+ c->init_time(util::get_image_ctx(&m_image_ctx), AIO_TYPE_WRITE);
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "completion=" << c << ", off=" << off << ", "
+ << "len=" << len << ", flags=" << op_flags << dendl;
+
+ if (native_async && m_image_ctx.event_socket.is_valid()) {
+ c->set_event_notify(true);
+ }
+
+ if (!start_in_flight_io(c)) {
+ return;
+ }
+
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.non_blocking_aio || writes_blocked()) {
+ queue(ImageRequest<I>::create_write_request(
+ m_image_ctx, c, {{off, len}}, std::move(bl), op_flags, trace));
+ } else {
+ c->start_op();
+ ImageRequest<I>::aio_write(&m_image_ctx, c, {{off, len}},
+ std::move(bl), op_flags, trace);
+ finish_in_flight_io();
+ }
+ trace.event("finish");
+}
+
+template <typename I>
+void ImageRequestWQ<I>::aio_discard(AioCompletion *c, uint64_t off,
+ uint64_t len, bool skip_partial_discard,
+ bool native_async) {
+ CephContext *cct = m_image_ctx.cct;
+ ZTracer::Trace trace;
+ if (m_image_ctx.blkin_trace_all) {
+ trace.init("wq: discard", &m_image_ctx.trace_endpoint);
+ trace.event("init");
+ }
+
+ c->init_time(util::get_image_ctx(&m_image_ctx), AIO_TYPE_DISCARD);
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "completion=" << c << ", off=" << off << ", len=" << len
+ << dendl;
+
+ if (native_async && m_image_ctx.event_socket.is_valid()) {
+ c->set_event_notify(true);
+ }
+
+ if (!start_in_flight_io(c)) {
+ return;
+ }
+
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.non_blocking_aio || writes_blocked()) {
+ queue(ImageRequest<I>::create_discard_request(
+ m_image_ctx, c, off, len, skip_partial_discard, trace));
+ } else {
+ c->start_op();
+ ImageRequest<I>::aio_discard(&m_image_ctx, c, off, len,
+ skip_partial_discard, trace);
+ finish_in_flight_io();
+ }
+ trace.event("finish");
+}
+
+template <typename I>
+void ImageRequestWQ<I>::aio_flush(AioCompletion *c, bool native_async) {
+ CephContext *cct = m_image_ctx.cct;
+ ZTracer::Trace trace;
+ if (m_image_ctx.blkin_trace_all) {
+ trace.init("wq: flush", &m_image_ctx.trace_endpoint);
+ trace.event("init");
+ }
+
+ c->init_time(util::get_image_ctx(&m_image_ctx), AIO_TYPE_FLUSH);
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "completion=" << c << dendl;
+
+ if (native_async && m_image_ctx.event_socket.is_valid()) {
+ c->set_event_notify(true);
+ }
+
+ if (!start_in_flight_io(c)) {
+ return;
+ }
+
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.non_blocking_aio || writes_blocked() || !writes_empty()) {
+ queue(ImageRequest<I>::create_flush_request(m_image_ctx, c, trace));
+ } else {
+ ImageRequest<I>::aio_flush(&m_image_ctx, c, trace);
+ finish_in_flight_io();
+ }
+ trace.event("finish");
+}
+
+template <typename I>
+void ImageRequestWQ<I>::aio_writesame(AioCompletion *c, uint64_t off,
+ uint64_t len, bufferlist &&bl,
+ int op_flags, bool native_async) {
+ CephContext *cct = m_image_ctx.cct;
+ ZTracer::Trace trace;
+ if (m_image_ctx.blkin_trace_all) {
+ trace.init("wq: writesame", &m_image_ctx.trace_endpoint);
+ trace.event("init");
+ }
+
+ c->init_time(util::get_image_ctx(&m_image_ctx), AIO_TYPE_WRITESAME);
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "completion=" << c << ", off=" << off << ", "
+ << "len=" << len << ", data_len = " << bl.length() << ", "
+ << "flags=" << op_flags << dendl;
+
+ if (native_async && m_image_ctx.event_socket.is_valid()) {
+ c->set_event_notify(true);
+ }
+
+ if (!start_in_flight_io(c)) {
+ return;
+ }
+
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.non_blocking_aio || writes_blocked()) {
+ queue(ImageRequest<I>::create_writesame_request(
+ m_image_ctx, c, off, len, std::move(bl), op_flags, trace));
+ } else {
+ c->start_op();
+ ImageRequest<I>::aio_writesame(&m_image_ctx, c, off, len, std::move(bl),
+ op_flags, trace);
+ finish_in_flight_io();
+ }
+ trace.event("finish");
+}
+
+template <typename I>
+void ImageRequestWQ<I>::aio_compare_and_write(AioCompletion *c,
+ uint64_t off, uint64_t len,
+ bufferlist &&cmp_bl,
+ bufferlist &&bl,
+ uint64_t *mismatch_off,
+ int op_flags, bool native_async) {
+ CephContext *cct = m_image_ctx.cct;
+ ZTracer::Trace trace;
+ if (m_image_ctx.blkin_trace_all) {
+ trace.init("wq: compare_and_write", &m_image_ctx.trace_endpoint);
+ trace.event("init");
+ }
+
+ c->init_time(util::get_image_ctx(&m_image_ctx), AIO_TYPE_COMPARE_AND_WRITE);
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "completion=" << c << ", off=" << off << ", "
+ << "len=" << len << dendl;
+
+ if (native_async && m_image_ctx.event_socket.is_valid()) {
+ c->set_event_notify(true);
+ }
+
+ if (!start_in_flight_io(c)) {
+ return;
+ }
+
+ RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+ if (m_image_ctx.non_blocking_aio || writes_blocked()) {
+ queue(ImageRequest<I>::create_compare_and_write_request(
+ m_image_ctx, c, {{off, len}}, std::move(cmp_bl), std::move(bl),
+ mismatch_off, op_flags, trace));
+ } else {
+ c->start_op();
+ ImageRequest<I>::aio_compare_and_write(&m_image_ctx, c, {{off, len}},
+ std::move(cmp_bl), std::move(bl),
+ mismatch_off, op_flags, trace);
+ finish_in_flight_io();
+ }
+ trace.event("finish");
+}
+
+template <typename I>
+void ImageRequestWQ<I>::shut_down(Context *on_shutdown) {
+ assert(m_image_ctx.owner_lock.is_locked());
+
+ {
+ RWLock::WLocker locker(m_lock);
+ assert(!m_shutdown);
+ m_shutdown = true;
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << __func__ << ": in_flight=" << m_in_flight_ios.load()
+ << dendl;
+ if (m_in_flight_ios > 0) {
+ m_on_shutdown = on_shutdown;
+ return;
+ }
+ }
+
+ // ensure that all in-flight IO is flushed
+ m_image_ctx.flush(on_shutdown);
+}
+
+template <typename I>
+int ImageRequestWQ<I>::block_writes() {
+ C_SaferCond cond_ctx;
+ block_writes(&cond_ctx);
+ return cond_ctx.wait();
+}
+
+template <typename I>
+void ImageRequestWQ<I>::block_writes(Context *on_blocked) {
+ assert(m_image_ctx.owner_lock.is_locked());
+ CephContext *cct = m_image_ctx.cct;
+
+ {
+ RWLock::WLocker locker(m_lock);
+ ++m_write_blockers;
+ ldout(cct, 5) << &m_image_ctx << ", " << "num="
+ << m_write_blockers << dendl;
+ if (!m_write_blocker_contexts.empty() || m_in_flight_writes > 0) {
+ m_write_blocker_contexts.push_back(on_blocked);
+ return;
+ }
+ }
+
+ // ensure that all in-flight IO is flushed
+ m_image_ctx.flush(on_blocked);
+}
+
+template <typename I>
+void ImageRequestWQ<I>::unblock_writes() {
+ CephContext *cct = m_image_ctx.cct;
+
+ bool wake_up = false;
+ {
+ RWLock::WLocker locker(m_lock);
+ assert(m_write_blockers > 0);
+ --m_write_blockers;
+
+ ldout(cct, 5) << &m_image_ctx << ", " << "num="
+ << m_write_blockers << dendl;
+ if (m_write_blockers == 0) {
+ wake_up = true;
+ }
+ }
+
+ if (wake_up) {
+ this->signal();
+ }
+}
+
+template <typename I>
+void ImageRequestWQ<I>::set_require_lock(Direction direction, bool enabled) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << dendl;
+
+ bool wake_up = false;
+ {
+ RWLock::WLocker locker(m_lock);
+ switch (direction) {
+ case DIRECTION_READ:
+ wake_up = (enabled != m_require_lock_on_read);
+ m_require_lock_on_read = enabled;
+ break;
+ case DIRECTION_WRITE:
+ wake_up = (enabled != m_require_lock_on_write);
+ m_require_lock_on_write = enabled;
+ break;
+ case DIRECTION_BOTH:
+ wake_up = (enabled != m_require_lock_on_read ||
+ enabled != m_require_lock_on_write);
+ m_require_lock_on_read = enabled;
+ m_require_lock_on_write = enabled;
+ break;
+ }
+ }
+
+ // wake up the thread pool whenever the state changes so that
+ // we can re-request the lock if required
+ if (wake_up) {
+ this->signal();
+ }
+}
+
+template <typename I>
+void *ImageRequestWQ<I>::_void_dequeue() {
+ CephContext *cct = m_image_ctx.cct;
+ ImageRequest<I> *peek_item = this->front();
+
+ // no queued IO requests or all IO is blocked/stalled
+ if (peek_item == nullptr || m_io_blockers.load() > 0) {
+ return nullptr;
+ }
+
+ bool lock_required;
+ bool refresh_required = m_image_ctx.state->is_refresh_required();
+ {
+ RWLock::RLocker locker(m_lock);
+ bool write_op = peek_item->is_write_op();
+ lock_required = is_lock_required(write_op);
+ if (write_op) {
+ if (!lock_required && m_write_blockers > 0) {
+ // missing lock is not the write blocker
+ return nullptr;
+ }
+
+ if (!lock_required && !refresh_required) {
+ // completed ops will requeue the IO -- don't count it as in-progress
+ m_in_flight_writes++;
+ }
+ }
+ }
+
+ ImageRequest<I> *item = reinterpret_cast<ImageRequest<I> *>(
+ ThreadPool::PointerWQ<ImageRequest<I> >::_void_dequeue());
+ assert(peek_item == item);
+
+ if (lock_required) {
+ this->get_pool_lock().Unlock();
+ m_image_ctx.owner_lock.get_read();
+ if (m_image_ctx.exclusive_lock != nullptr) {
+ ldout(cct, 5) << "exclusive lock required: delaying IO " << item << dendl;
+ if (!m_image_ctx.get_exclusive_lock_policy()->may_auto_request_lock()) {
+ lderr(cct) << "op requires exclusive lock" << dendl;
+ fail_in_flight_io(-EROFS, item);
+
+ // wake up the IO since we won't be returning a request to process
+ this->signal();
+ } else {
+ // stall IO until the acquire completes
+ ++m_io_blockers;
+ m_image_ctx.exclusive_lock->acquire_lock(new C_AcquireLock(this, item));
+ }
+ } else {
+ // raced with the exclusive lock being disabled
+ lock_required = false;
+ }
+ m_image_ctx.owner_lock.put_read();
+ this->get_pool_lock().Lock();
+
+ if (lock_required) {
+ return nullptr;
+ }
+ }
+
+ if (refresh_required) {
+ ldout(cct, 5) << "image refresh required: delaying IO " << item << dendl;
+
+ // stall IO until the refresh completes
+ ++m_io_blockers;
+
+ this->get_pool_lock().Unlock();
+ m_image_ctx.state->refresh(new C_RefreshFinish(this, item));
+ this->get_pool_lock().Lock();
+ return nullptr;
+ }
+
+ item->start_op();
+ return item;
+}
+
+template <typename I>
+void ImageRequestWQ<I>::process(ImageRequest<I> *req) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "req=" << req << dendl;
+
+ req->send();
+
+ finish_queued_io(req);
+ if (req->is_write_op()) {
+ finish_in_flight_write();
+ }
+ delete req;
+
+ finish_in_flight_io();
+}
+
+template <typename I>
+void ImageRequestWQ<I>::finish_queued_io(ImageRequest<I> *req) {
+ RWLock::RLocker locker(m_lock);
+ if (req->is_write_op()) {
+ assert(m_queued_writes > 0);
+ m_queued_writes--;
+ } else {
+ assert(m_queued_reads > 0);
+ m_queued_reads--;
+ }
+}
+
+template <typename I>
+void ImageRequestWQ<I>::finish_in_flight_write() {
+ bool writes_blocked = false;
+ {
+ RWLock::RLocker locker(m_lock);
+ assert(m_in_flight_writes > 0);
+ if (--m_in_flight_writes == 0 &&
+ !m_write_blocker_contexts.empty()) {
+ writes_blocked = true;
+ }
+ }
+
+ if (writes_blocked) {
+ m_image_ctx.flush(new C_BlockedWrites(this));
+ }
+}
+
+template <typename I>
+int ImageRequestWQ<I>::start_in_flight_io(AioCompletion *c) {
+ RWLock::RLocker locker(m_lock);
+
+ if (m_shutdown) {
+ CephContext *cct = m_image_ctx.cct;
+ lderr(cct) << "IO received on closed image" << dendl;
+
+ c->get();
+ c->fail(-ESHUTDOWN);
+ return false;
+ }
+
+ m_in_flight_ios++;
+ return true;
+}
+
+template <typename I>
+void ImageRequestWQ<I>::finish_in_flight_io() {
+ Context *on_shutdown;
+ {
+ RWLock::RLocker locker(m_lock);
+ if (--m_in_flight_ios > 0 || !m_shutdown) {
+ return;
+ }
+ on_shutdown = m_on_shutdown;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << "completing shut down" << dendl;
+
+ assert(on_shutdown != nullptr);
+ m_image_ctx.flush(on_shutdown);
+}
+
+template <typename I>
+void ImageRequestWQ<I>::fail_in_flight_io(int r, ImageRequest<I> *req) {
+ this->process_finish();
+ req->fail(r);
+ finish_queued_io(req);
+ delete req;
+ finish_in_flight_io();
+}
+
+template <typename I>
+bool ImageRequestWQ<I>::is_lock_required(bool write_op) const {
+ assert(m_lock.is_locked());
+ return ((write_op && m_require_lock_on_write) ||
+ (!write_op && m_require_lock_on_read));
+}
+
+template <typename I>
+void ImageRequestWQ<I>::queue(ImageRequest<I> *req) {
+ assert(m_image_ctx.owner_lock.is_locked());
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "ictx=" << &m_image_ctx << ", "
+ << "req=" << req << dendl;
+
+ if (req->is_write_op()) {
+ m_queued_writes++;
+ } else {
+ m_queued_reads++;
+ }
+
+ ThreadPool::PointerWQ<ImageRequest<I> >::queue(req);
+}
+
+template <typename I>
+void ImageRequestWQ<I>::handle_acquire_lock(int r, ImageRequest<I> *req) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << "r=" << r << ", " << "req=" << req << dendl;
+
+ if (r < 0) {
+ fail_in_flight_io(r, req);
+ } else {
+ // since IO was stalled for acquire -- original IO order is preserved
+ // if we requeue this op for work queue processing
+ this->requeue(req);
+ }
+
+ assert(m_io_blockers.load() > 0);
+ --m_io_blockers;
+ this->signal();
+}
+
+template <typename I>
+void ImageRequestWQ<I>::handle_refreshed(int r, ImageRequest<I> *req) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 5) << "resuming IO after image refresh: r=" << r << ", "
+ << "req=" << req << dendl;
+ if (r < 0) {
+ fail_in_flight_io(r, req);
+ } else {
+ // since IO was stalled for refresh -- original IO order is preserved
+ // if we requeue this op for work queue processing
+ this->requeue(req);
+ }
+
+ assert(m_io_blockers.load() > 0);
+ --m_io_blockers;
+ this->signal();
+}
+
+template <typename I>
+void ImageRequestWQ<I>::handle_blocked_writes(int r) {
+ Contexts contexts;
+ {
+ RWLock::WLocker locker(m_lock);
+ contexts.swap(m_write_blocker_contexts);
+ }
+
+ for (auto ctx : contexts) {
+ ctx->complete(0);
+ }
+}
+
+template class librbd::io::ImageRequestWQ<librbd::ImageCtx>;
+
+} // namespace io
+} // namespace librbd
Code Review / stor4nfv.git / blobdiff