--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "KernelDevice.h"
+#include "include/types.h"
+#include "include/compat.h"
+#include "include/stringify.h"
+#include "common/errno.h"
+#include "common/debug.h"
+#include "common/blkdev.h"
+#include "common/align.h"
+#include "common/blkdev.h"
+
+#define dout_context cct
+#define dout_subsys ceph_subsys_bdev
+#undef dout_prefix
+#define dout_prefix *_dout << "bdev(" << this << " " << path << ") "
+
+KernelDevice::KernelDevice(CephContext* cct, aio_callback_t cb, void *cbpriv)
+ : BlockDevice(cct),
+ fd_direct(-1),
+ fd_buffered(-1),
+ size(0), block_size(0),
+ fs(NULL), aio(false), dio(false),
+ debug_lock("KernelDevice::debug_lock"),
+ aio_queue(cct->_conf->bdev_aio_max_queue_depth),
+ aio_callback(cb),
+ aio_callback_priv(cbpriv),
+ aio_stop(false),
+ aio_thread(this),
+ injecting_crash(0)
+{
+}
+
+int KernelDevice::_lock()
+{
+ struct flock l;
+ memset(&l, 0, sizeof(l));
+ l.l_type = F_WRLCK;
+ l.l_whence = SEEK_SET;
+ int r = ::fcntl(fd_direct, F_SETLK, &l);
+ if (r < 0)
+ return -errno;
+ return 0;
+}
+
+int KernelDevice::open(const string& p)
+{
+ path = p;
+ int r = 0;
+ dout(1) << __func__ << " path " << path << dendl;
+
+ fd_direct = ::open(path.c_str(), O_RDWR | O_DIRECT);
+ if (fd_direct < 0) {
+ r = -errno;
+ derr << __func__ << " open got: " << cpp_strerror(r) << dendl;
+ return r;
+ }
+ fd_buffered = ::open(path.c_str(), O_RDWR);
+ if (fd_buffered < 0) {
+ r = -errno;
+ derr << __func__ << " open got: " << cpp_strerror(r) << dendl;
+ goto out_direct;
+ }
+ dio = true;
+ aio = cct->_conf->bdev_aio;
+ if (!aio) {
+ assert(0 == "non-aio not supported");
+ }
+
+ // disable readahead as it will wreak havoc on our mix of
+ // directio/aio and buffered io.
+ r = posix_fadvise(fd_buffered, 0, 0, POSIX_FADV_RANDOM);
+ if (r) {
+ r = -r;
+ derr << __func__ << " open got: " << cpp_strerror(r) << dendl;
+ goto out_fail;
+ }
+
+ r = _lock();
+ if (r < 0) {
+ derr << __func__ << " failed to lock " << path << ": " << cpp_strerror(r)
+ << dendl;
+ goto out_fail;
+ }
+
+ struct stat st;
+ r = ::fstat(fd_direct, &st);
+ if (r < 0) {
+ r = -errno;
+ derr << __func__ << " fstat got " << cpp_strerror(r) << dendl;
+ goto out_fail;
+ }
+
+ // Operate as though the block size is 4 KB. The backing file
+ // blksize doesn't strictly matter except that some file systems may
+ // require a read/modify/write if we write something smaller than
+ // it.
+ block_size = cct->_conf->bdev_block_size;
+ if (block_size != (unsigned)st.st_blksize) {
+ dout(1) << __func__ << " backing device/file reports st_blksize "
+ << st.st_blksize << ", using bdev_block_size "
+ << block_size << " anyway" << dendl;
+ }
+
+ if (S_ISBLK(st.st_mode)) {
+ int64_t s;
+ r = get_block_device_size(fd_direct, &s);
+ if (r < 0) {
+ goto out_fail;
+ }
+ size = s;
+ } else {
+ size = st.st_size;
+ }
+ if (cct->_conf->get_val<bool>("bdev_inject_bad_size")) {
+ derr << "injecting bad size; actual 0x" << std::hex << size
+ << " but using 0x" << (size & ~block_size) << std::dec << dendl;
+ size &= ~(block_size);
+ }
+
+ {
+ char partition[PATH_MAX], devname[PATH_MAX];
+ r = get_device_by_fd(fd_buffered, partition, devname, sizeof(devname));
+ if (r < 0) {
+ derr << "unable to get device name for " << path << ": "
+ << cpp_strerror(r) << dendl;
+ rotational = true;
+ } else {
+ dout(20) << __func__ << " devname " << devname << dendl;
+ rotational = block_device_is_rotational(devname);
+ }
+ }
+
+ r = _aio_start();
+ if (r < 0) {
+ goto out_fail;
+ }
+
+ fs = FS::create_by_fd(fd_direct);
+ assert(fs);
+
+ // round size down to an even block
+ size &= ~(block_size - 1);
+
+ dout(1) << __func__
+ << " size " << size
+ << " (0x" << std::hex << size << std::dec << ", "
+ << pretty_si_t(size) << "B)"
+ << " block_size " << block_size
+ << " (" << pretty_si_t(block_size) << "B)"
+ << " " << (rotational ? "rotational" : "non-rotational")
+ << dendl;
+ return 0;
+
+ out_fail:
+ VOID_TEMP_FAILURE_RETRY(::close(fd_buffered));
+ fd_buffered = -1;
+ out_direct:
+ VOID_TEMP_FAILURE_RETRY(::close(fd_direct));
+ fd_direct = -1;
+ return r;
+}
+
+void KernelDevice::close()
+{
+ dout(1) << __func__ << dendl;
+ _aio_stop();
+
+ assert(fs);
+ delete fs;
+ fs = NULL;
+
+ assert(fd_direct >= 0);
+ VOID_TEMP_FAILURE_RETRY(::close(fd_direct));
+ fd_direct = -1;
+
+ assert(fd_buffered >= 0);
+ VOID_TEMP_FAILURE_RETRY(::close(fd_buffered));
+ fd_buffered = -1;
+
+ path.clear();
+}
+
+static string get_dev_property(const char *dev, const char *property)
+{
+ char val[1024] = {0};
+ get_block_device_string_property(dev, property, val, sizeof(val));
+ return val;
+}
+
+int KernelDevice::collect_metadata(string prefix, map<string,string> *pm) const
+{
+ (*pm)[prefix + "rotational"] = stringify((int)(bool)rotational);
+ (*pm)[prefix + "size"] = stringify(get_size());
+ (*pm)[prefix + "block_size"] = stringify(get_block_size());
+ (*pm)[prefix + "driver"] = "KernelDevice";
+ if (rotational) {
+ (*pm)[prefix + "type"] = "hdd";
+ } else {
+ (*pm)[prefix + "type"] = "ssd";
+ }
+
+ struct stat st;
+ int r = ::fstat(fd_buffered, &st);
+ if (r < 0)
+ return -errno;
+ if (S_ISBLK(st.st_mode)) {
+ (*pm)[prefix + "access_mode"] = "blk";
+ char partition_path[PATH_MAX];
+ char dev_node[PATH_MAX];
+ int rc = get_device_by_fd(fd_buffered, partition_path, dev_node, PATH_MAX);
+ switch (rc) {
+ case -EOPNOTSUPP:
+ case -EINVAL:
+ (*pm)[prefix + "partition_path"] = "unknown";
+ (*pm)[prefix + "dev_node"] = "unknown";
+ break;
+ case -ENODEV:
+ (*pm)[prefix + "partition_path"] = string(partition_path);
+ (*pm)[prefix + "dev_node"] = "unknown";
+ break;
+ default:
+ {
+ (*pm)[prefix + "partition_path"] = string(partition_path);
+ (*pm)[prefix + "dev_node"] = string(dev_node);
+ (*pm)[prefix + "model"] = get_dev_property(dev_node, "device/model");
+ (*pm)[prefix + "dev"] = get_dev_property(dev_node, "dev");
+
+ // nvme exposes a serial number
+ string serial = get_dev_property(dev_node, "device/serial");
+ if (serial.length()) {
+ (*pm)[prefix + "serial"] = serial;
+ }
+
+ // nvme has a device/device/* structure; infer from that. there
+ // is probably a better way?
+ string nvme_vendor = get_dev_property(dev_node, "device/device/vendor");
+ if (nvme_vendor.length()) {
+ (*pm)[prefix + "type"] = "nvme";
+ }
+ }
+ }
+ } else {
+ (*pm)[prefix + "access_mode"] = "file";
+ (*pm)[prefix + "path"] = path;
+ }
+ return 0;
+}
+
+int KernelDevice::flush()
+{
+ // protect flush with a mutex. note that we are not really protecting
+ // data here. instead, we're ensuring that if any flush() caller
+ // sees that io_since_flush is true, they block any racing callers
+ // until the flush is observed. that allows racing threads to be
+ // calling flush while still ensuring that *any* of them that got an
+ // aio completion notification will not return before that aio is
+ // stable on disk: whichever thread sees the flag first will block
+ // followers until the aio is stable.
+ std::lock_guard<std::mutex> l(flush_mutex);
+
+ bool expect = true;
+ if (!io_since_flush.compare_exchange_strong(expect, false)) {
+ dout(10) << __func__ << " no-op (no ios since last flush), flag is "
+ << (int)io_since_flush.load() << dendl;
+ return 0;
+ }
+
+ dout(10) << __func__ << " start" << dendl;
+ if (cct->_conf->bdev_inject_crash) {
+ ++injecting_crash;
+ // sleep for a moment to give other threads a chance to submit or
+ // wait on io that races with a flush.
+ derr << __func__ << " injecting crash. first we sleep..." << dendl;
+ sleep(cct->_conf->bdev_inject_crash_flush_delay);
+ derr << __func__ << " and now we die" << dendl;
+ cct->_log->flush();
+ _exit(1);
+ }
+ utime_t start = ceph_clock_now();
+ int r = ::fdatasync(fd_direct);
+ utime_t end = ceph_clock_now();
+ utime_t dur = end - start;
+ if (r < 0) {
+ r = -errno;
+ derr << __func__ << " fdatasync got: " << cpp_strerror(r) << dendl;
+ ceph_abort();
+ }
+ dout(5) << __func__ << " in " << dur << dendl;;
+ return r;
+}
+
+int KernelDevice::_aio_start()
+{
+ if (aio) {
+ dout(10) << __func__ << dendl;
+ int r = aio_queue.init();
+ if (r < 0) {
+ if (r == -EAGAIN) {
+ derr << __func__ << " io_setup(2) failed with EAGAIN; "
+ << "try increasing /proc/sys/fs/aio-max-nr" << dendl;
+ } else {
+ derr << __func__ << " io_setup(2) failed: " << cpp_strerror(r) << dendl;
+ }
+ return r;
+ }
+ aio_thread.create("bstore_aio");
+ }
+ return 0;
+}
+
+void KernelDevice::_aio_stop()
+{
+ if (aio) {
+ dout(10) << __func__ << dendl;
+ aio_stop = true;
+ aio_thread.join();
+ aio_stop = false;
+ aio_queue.shutdown();
+ }
+}
+
+void KernelDevice::_aio_thread()
+{
+ dout(10) << __func__ << " start" << dendl;
+ int inject_crash_count = 0;
+ while (!aio_stop) {
+ dout(40) << __func__ << " polling" << dendl;
+ int max = cct->_conf->bdev_aio_reap_max;
+ aio_t *aio[max];
+ int r = aio_queue.get_next_completed(cct->_conf->bdev_aio_poll_ms,
+ aio, max);
+ if (r < 0) {
+ derr << __func__ << " got " << cpp_strerror(r) << dendl;
+ }
+ if (r > 0) {
+ dout(30) << __func__ << " got " << r << " completed aios" << dendl;
+ for (int i = 0; i < r; ++i) {
+ IOContext *ioc = static_cast<IOContext*>(aio[i]->priv);
+ _aio_log_finish(ioc, aio[i]->offset, aio[i]->length);
+ if (aio[i]->queue_item.is_linked()) {
+ std::lock_guard<std::mutex> l(debug_queue_lock);
+ debug_aio_unlink(*aio[i]);
+ }
+
+ // set flag indicating new ios have completed. we do this *before*
+ // any completion or notifications so that any user flush() that
+ // follows the observed io completion will include this io. Note
+ // that an earlier, racing flush() could observe and clear this
+ // flag, but that also ensures that the IO will be stable before the
+ // later flush() occurs.
+ io_since_flush.store(true);
+
+ int r = aio[i]->get_return_value();
+ dout(10) << __func__ << " finished aio " << aio[i] << " r " << r
+ << " ioc " << ioc
+ << " with " << (ioc->num_running.load() - 1)
+ << " aios left" << dendl;
+ assert(r >= 0);
+
+ // NOTE: once num_running and we either call the callback or
+ // call aio_wake we cannot touch ioc or aio[] as the caller
+ // may free it.
+ if (ioc->priv) {
+ if (--ioc->num_running == 0) {
+ aio_callback(aio_callback_priv, ioc->priv);
+ }
+ } else {
+ ioc->try_aio_wake();
+ }
+ }
+ }
+ if (cct->_conf->bdev_debug_aio) {
+ utime_t now = ceph_clock_now();
+ std::lock_guard<std::mutex> l(debug_queue_lock);
+ if (debug_oldest) {
+ if (debug_stall_since == utime_t()) {
+ debug_stall_since = now;
+ } else {
+ utime_t cutoff = now;
+ cutoff -= cct->_conf->bdev_debug_aio_suicide_timeout;
+ if (debug_stall_since < cutoff) {
+ derr << __func__ << " stalled aio " << debug_oldest
+ << " since " << debug_stall_since << ", timeout is "
+ << cct->_conf->bdev_debug_aio_suicide_timeout
+ << "s, suicide" << dendl;
+ assert(0 == "stalled aio... buggy kernel or bad device?");
+ }
+ }
+ }
+ }
+ reap_ioc();
+ if (cct->_conf->bdev_inject_crash) {
+ ++inject_crash_count;
+ if (inject_crash_count * cct->_conf->bdev_aio_poll_ms / 1000 >
+ cct->_conf->bdev_inject_crash + cct->_conf->bdev_inject_crash_flush_delay) {
+ derr << __func__ << " bdev_inject_crash trigger from aio thread"
+ << dendl;
+ cct->_log->flush();
+ _exit(1);
+ }
+ }
+ }
+ reap_ioc();
+ dout(10) << __func__ << " end" << dendl;
+}
+
+void KernelDevice::_aio_log_start(
+ IOContext *ioc,
+ uint64_t offset,
+ uint64_t length)
+{
+ dout(20) << __func__ << " 0x" << std::hex << offset << "~" << length
+ << std::dec << dendl;
+ if (cct->_conf->bdev_debug_inflight_ios) {
+ Mutex::Locker l(debug_lock);
+ if (debug_inflight.intersects(offset, length)) {
+ derr << __func__ << " inflight overlap of 0x"
+ << std::hex
+ << offset << "~" << length << std::dec
+ << " with " << debug_inflight << dendl;
+ ceph_abort();
+ }
+ debug_inflight.insert(offset, length);
+ }
+}
+
+void KernelDevice::debug_aio_link(aio_t& aio)
+{
+ if (debug_queue.empty()) {
+ debug_oldest = &aio;
+ }
+ debug_queue.push_back(aio);
+}
+
+void KernelDevice::debug_aio_unlink(aio_t& aio)
+{
+ if (aio.queue_item.is_linked()) {
+ debug_queue.erase(debug_queue.iterator_to(aio));
+ if (debug_oldest == &aio) {
+ if (debug_queue.empty()) {
+ debug_oldest = nullptr;
+ } else {
+ debug_oldest = &debug_queue.front();
+ }
+ debug_stall_since = utime_t();
+ }
+ }
+}
+
+void KernelDevice::_aio_log_finish(
+ IOContext *ioc,
+ uint64_t offset,
+ uint64_t length)
+{
+ dout(20) << __func__ << " " << aio << " 0x"
+ << std::hex << offset << "~" << length << std::dec << dendl;
+ if (cct->_conf->bdev_debug_inflight_ios) {
+ Mutex::Locker l(debug_lock);
+ debug_inflight.erase(offset, length);
+ }
+}
+
+void KernelDevice::aio_submit(IOContext *ioc)
+{
+ dout(20) << __func__ << " ioc " << ioc
+ << " pending " << ioc->num_pending.load()
+ << " running " << ioc->num_running.load()
+ << dendl;
+
+ if (ioc->num_pending.load() == 0) {
+ return;
+ }
+
+ // move these aside, and get our end iterator position now, as the
+ // aios might complete as soon as they are submitted and queue more
+ // wal aio's.
+ list<aio_t>::iterator e = ioc->running_aios.begin();
+ ioc->running_aios.splice(e, ioc->pending_aios);
+
+ int pending = ioc->num_pending.load();
+ ioc->num_running += pending;
+ ioc->num_pending -= pending;
+ assert(ioc->num_pending.load() == 0); // we should be only thread doing this
+ assert(ioc->pending_aios.size() == 0);
+
+ if (cct->_conf->bdev_debug_aio) {
+ list<aio_t>::iterator p = ioc->running_aios.begin();
+ while (p != e) {
+ for (auto& io : p->iov)
+ dout(30) << __func__ << " iov " << (void*)io.iov_base
+ << " len " << io.iov_len << dendl;
+
+ std::lock_guard<std::mutex> l(debug_queue_lock);
+ debug_aio_link(*p++);
+ }
+ }
+
+ void *priv = static_cast<void*>(ioc);
+ int r, retries = 0;
+ r = aio_queue.submit_batch(ioc->running_aios.begin(), e,
+ ioc->num_running.load(), priv, &retries);
+
+ if (retries)
+ derr << __func__ << " retries " << retries << dendl;
+ if (r < 0) {
+ derr << " aio submit got " << cpp_strerror(r) << dendl;
+ assert(r == 0);
+ }
+}
+
+int KernelDevice::_sync_write(uint64_t off, bufferlist &bl, bool buffered)
+{
+ uint64_t len = bl.length();
+ dout(5) << __func__ << " 0x" << std::hex << off << "~" << len
+ << std::dec << " buffered" << dendl;
+ if (cct->_conf->bdev_inject_crash &&
+ rand() % cct->_conf->bdev_inject_crash == 0) {
+ derr << __func__ << " bdev_inject_crash: dropping io 0x" << std::hex
+ << off << "~" << len << std::dec << dendl;
+ ++injecting_crash;
+ return 0;
+ }
+ vector<iovec> iov;
+ bl.prepare_iov(&iov);
+ int r = ::pwritev(buffered ? fd_buffered : fd_direct,
+ &iov[0], iov.size(), off);
+
+ if (r < 0) {
+ r = -errno;
+ derr << __func__ << " pwritev error: " << cpp_strerror(r) << dendl;
+ return r;
+ }
+ if (buffered) {
+ // initiate IO (but do not wait)
+ r = ::sync_file_range(fd_buffered, off, len, SYNC_FILE_RANGE_WRITE);
+ if (r < 0) {
+ r = -errno;
+ derr << __func__ << " sync_file_range error: " << cpp_strerror(r) << dendl;
+ return r;
+ }
+ }
+
+ io_since_flush.store(true);
+
+ return 0;
+}
+
+int KernelDevice::write(
+ uint64_t off,
+ bufferlist &bl,
+ bool buffered)
+{
+ uint64_t len = bl.length();
+ dout(20) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << (buffered ? " (buffered)" : " (direct)")
+ << dendl;
+ assert(off % block_size == 0);
+ assert(len % block_size == 0);
+ assert(len > 0);
+ assert(off < size);
+ assert(off + len <= size);
+
+ if ((!buffered || bl.get_num_buffers() >= IOV_MAX) &&
+ bl.rebuild_aligned_size_and_memory(block_size, block_size)) {
+ dout(20) << __func__ << " rebuilding buffer to be aligned" << dendl;
+ }
+ dout(40) << "data: ";
+ bl.hexdump(*_dout);
+ *_dout << dendl;
+
+ return _sync_write(off, bl, buffered);
+}
+
+int KernelDevice::aio_write(
+ uint64_t off,
+ bufferlist &bl,
+ IOContext *ioc,
+ bool buffered)
+{
+ uint64_t len = bl.length();
+ dout(20) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << (buffered ? " (buffered)" : " (direct)")
+ << dendl;
+ assert(off % block_size == 0);
+ assert(len % block_size == 0);
+ assert(len > 0);
+ assert(off < size);
+ assert(off + len <= size);
+
+ if ((!buffered || bl.get_num_buffers() >= IOV_MAX) &&
+ bl.rebuild_aligned_size_and_memory(block_size, block_size)) {
+ dout(20) << __func__ << " rebuilding buffer to be aligned" << dendl;
+ }
+ dout(40) << "data: ";
+ bl.hexdump(*_dout);
+ *_dout << dendl;
+
+ _aio_log_start(ioc, off, len);
+
+#ifdef HAVE_LIBAIO
+ if (aio && dio && !buffered) {
+ ioc->pending_aios.push_back(aio_t(ioc, fd_direct));
+ ++ioc->num_pending;
+ aio_t& aio = ioc->pending_aios.back();
+ if (cct->_conf->bdev_inject_crash &&
+ rand() % cct->_conf->bdev_inject_crash == 0) {
+ derr << __func__ << " bdev_inject_crash: dropping io 0x" << std::hex
+ << off << "~" << len << std::dec
+ << dendl;
+ // generate a real io so that aio_wait behaves properly, but make it
+ // a read instead of write, and toss the result.
+ aio.pread(off, len);
+ ++injecting_crash;
+ } else {
+ bl.prepare_iov(&aio.iov);
+ for (unsigned i=0; i<aio.iov.size(); ++i) {
+ dout(30) << "aio " << i << " " << aio.iov[i].iov_base
+ << " " << aio.iov[i].iov_len << dendl;
+ }
+ aio.bl.claim_append(bl);
+ aio.pwritev(off, len);
+ }
+ dout(5) << __func__ << " 0x" << std::hex << off << "~" << len
+ << std::dec << " aio " << &aio << dendl;
+ } else
+#endif
+ {
+ int r = _sync_write(off, bl, buffered);
+ _aio_log_finish(ioc, off, len);
+ if (r < 0)
+ return r;
+ }
+ return 0;
+}
+
+int KernelDevice::read(uint64_t off, uint64_t len, bufferlist *pbl,
+ IOContext *ioc,
+ bool buffered)
+{
+ dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << (buffered ? " (buffered)" : " (direct)")
+ << dendl;
+ assert(off % block_size == 0);
+ assert(len % block_size == 0);
+ assert(len > 0);
+ assert(off < size);
+ assert(off + len <= size);
+
+ _aio_log_start(ioc, off, len);
+
+ bufferptr p = buffer::create_page_aligned(len);
+ int r = ::pread(buffered ? fd_buffered : fd_direct,
+ p.c_str(), len, off);
+ if (r < 0) {
+ r = -errno;
+ goto out;
+ }
+ assert((uint64_t)r == len);
+ pbl->push_back(std::move(p));
+
+ dout(40) << "data: ";
+ pbl->hexdump(*_dout);
+ *_dout << dendl;
+
+ out:
+ _aio_log_finish(ioc, off, len);
+ return r < 0 ? r : 0;
+}
+
+int KernelDevice::aio_read(
+ uint64_t off,
+ uint64_t len,
+ bufferlist *pbl,
+ IOContext *ioc)
+{
+ dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << dendl;
+
+ int r = 0;
+#ifdef HAVE_LIBAIO
+ if (aio && dio) {
+ _aio_log_start(ioc, off, len);
+ ioc->pending_aios.push_back(aio_t(ioc, fd_direct));
+ ++ioc->num_pending;
+ aio_t& aio = ioc->pending_aios.back();
+ aio.pread(off, len);
+ for (unsigned i=0; i<aio.iov.size(); ++i) {
+ dout(30) << "aio " << i << " " << aio.iov[i].iov_base
+ << " " << aio.iov[i].iov_len << dendl;
+ }
+ pbl->append(aio.bl);
+ dout(5) << __func__ << " 0x" << std::hex << off << "~" << len
+ << std::dec << " aio " << &aio << dendl;
+ } else
+#endif
+ {
+ r = read(off, len, pbl, ioc, false);
+ }
+
+ return r;
+}
+
+int KernelDevice::direct_read_unaligned(uint64_t off, uint64_t len, char *buf)
+{
+ uint64_t aligned_off = align_down(off, block_size);
+ uint64_t aligned_len = align_up(off+len, block_size) - aligned_off;
+ bufferptr p = buffer::create_page_aligned(aligned_len);
+ int r = 0;
+
+ r = ::pread(fd_direct, p.c_str(), aligned_len, aligned_off);
+ if (r < 0) {
+ r = -errno;
+ derr << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << " error: " << cpp_strerror(r) << dendl;
+ goto out;
+ }
+ assert((uint64_t)r == aligned_len);
+ memcpy(buf, p.c_str() + (off - aligned_off), len);
+
+ dout(40) << __func__ << " data: ";
+ bufferlist bl;
+ bl.append(buf, len);
+ bl.hexdump(*_dout);
+ *_dout << dendl;
+
+ out:
+ return r < 0 ? r : 0;
+}
+
+int KernelDevice::read_random(uint64_t off, uint64_t len, char *buf,
+ bool buffered)
+{
+ dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << dendl;
+ assert(len > 0);
+ assert(off < size);
+ assert(off + len <= size);
+ int r = 0;
+
+ //if it's direct io and unaligned, we have to use a internal buffer
+ if (!buffered && ((off % block_size != 0)
+ || (len % block_size != 0)
+ || (uintptr_t(buf) % CEPH_PAGE_SIZE != 0)))
+ return direct_read_unaligned(off, len, buf);
+
+ if (buffered) {
+ //buffered read
+ char *t = buf;
+ uint64_t left = len;
+ while (left > 0) {
+ r = ::pread(fd_buffered, t, left, off);
+ if (r < 0) {
+ r = -errno;
+ derr << __func__ << " 0x" << std::hex << off << "~" << left
+ << std::dec << " error: " << cpp_strerror(r) << dendl;
+ goto out;
+ }
+ off += r;
+ t += r;
+ left -= r;
+ }
+ } else {
+ //direct and aligned read
+ r = ::pread(fd_direct, buf, len, off);
+ if (r < 0) {
+ r = -errno;
+ derr << __func__ << " direct_aligned_read" << " 0x" << std::hex
+ << off << "~" << left << std::dec << " error: " << cpp_strerror(r)
+ << dendl;
+ goto out;
+ }
+ assert((uint64_t)r == len);
+ }
+
+ dout(40) << __func__ << " data: ";
+ bufferlist bl;
+ bl.append(buf, len);
+ bl.hexdump(*_dout);
+ *_dout << dendl;
+
+ out:
+ return r < 0 ? r : 0;
+}
+
+int KernelDevice::invalidate_cache(uint64_t off, uint64_t len)
+{
+ dout(5) << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << dendl;
+ assert(off % block_size == 0);
+ assert(len % block_size == 0);
+ int r = posix_fadvise(fd_buffered, off, len, POSIX_FADV_DONTNEED);
+ if (r) {
+ r = -r;
+ derr << __func__ << " 0x" << std::hex << off << "~" << len << std::dec
+ << " error: " << cpp_strerror(r) << dendl;
+ }
+ return r;
+}
+
Code Review / stor4nfv.git / blobdiff