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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/cache/ImageWriteback.h"
#include "LogEntry.h"
#define dout_subsys ceph_subsys_rbd_pwl
#undef dout_prefix
#define dout_prefix *_dout << "librbd::cache::pwl::rwl::WriteLogEntry: " \
<< this << " " << __func__ << ": "
namespace librbd {
namespace cache {
namespace pwl {
namespace rwl {
void WriteLogEntry::writeback(
librbd::cache::ImageWritebackInterface &image_writeback, Context *ctx) {
/* Pass a copy of the pmem buffer to ImageWriteback (which may hang on to the
* bl even after flush()). */
bufferlist entry_bl;
buffer::list entry_bl_copy;
copy_cache_bl(&entry_bl_copy);
entry_bl_copy.begin(0).copy(write_bytes(), entry_bl);
image_writeback.aio_write({{ram_entry.image_offset_bytes,
ram_entry.write_bytes}},
std::move(entry_bl), 0, ctx);
}
void WriteLogEntry::init_cache_bp() {
ceph_assert(!this->cache_bp.have_raw());
cache_bp = buffer::ptr(buffer::create_static(this->write_bytes(),
(char*)this->cache_buffer));
}
void WriteLogEntry::init_bl(buffer::ptr &bp, buffer::list &bl) {
if(!is_writesame) {
bl.append(bp);
return;
}
for (uint64_t i = 0; i < ram_entry.write_bytes / ram_entry.ws_datalen; i++) {
bl.append(bp);
}
int trailing_partial = ram_entry.write_bytes % ram_entry.ws_datalen;
if (trailing_partial) {
bl.append(bp, 0, trailing_partial);
}
}
void WriteLogEntry::init_cache_buffer(
std::vector<WriteBufferAllocation>::iterator allocation) {
this->ram_entry.write_data = allocation->buffer_oid;
ceph_assert(!TOID_IS_NULL(this->ram_entry.write_data));
cache_buffer = D_RW(this->ram_entry.write_data);
}
buffer::list& WriteLogEntry::get_cache_bl() {
if (0 == bl_refs) {
std::lock_guard locker(m_entry_bl_lock);
if (0 == bl_refs) {
//init pmem bufferlist
cache_bl.clear();
init_cache_bp();
ceph_assert(cache_bp.have_raw());
int before_bl = cache_bp.raw_nref();
this->init_bl(cache_bp, cache_bl);
int after_bl = cache_bp.raw_nref();
bl_refs = after_bl - before_bl;
}
ceph_assert(0 != bl_refs);
}
return cache_bl;
}
void WriteLogEntry::copy_cache_bl(bufferlist *out_bl) {
this->get_cache_bl();
// cache_bp is now initialized
ceph_assert(cache_bp.length() == cache_bp.raw_length());
buffer::ptr cloned_bp = cache_bp.begin_deep().get_ptr(cache_bp.length());
out_bl->clear();
this->init_bl(cloned_bp, *out_bl);
}
unsigned int WriteLogEntry::reader_count() const {
if (cache_bp.have_raw()) {
return (cache_bp.raw_nref() - bl_refs - 1);
} else {
return 0;
}
}
void WriteSameLogEntry::writeback(
librbd::cache::ImageWritebackInterface &image_writeback, Context *ctx) {
bufferlist entry_bl;
buffer::list entry_bl_copy;
copy_cache_bl(&entry_bl_copy);
entry_bl_copy.begin(0).copy(write_bytes(), entry_bl);
image_writeback.aio_writesame(ram_entry.image_offset_bytes,
ram_entry.write_bytes,
std::move(entry_bl), 0, ctx);
}
} // namespace rwl
} // namespace pwl
} // namespace cache
} // namespace librbd
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