I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
221 lines
5.5 KiB
C++
221 lines
5.5 KiB
C++
/*
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* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* device.cpp
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* Block device.
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <pthread.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include "block.h"
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#include "device.h"
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#include "ioleast.h"
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void* Device__SyncThread(void* ctx)
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{
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((Device*) ctx)->SyncThread();
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return NULL;
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}
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Device::Device(int fd, const char* path, uint32_t block_size, bool write)
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{
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// sync_thread unset.
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this->sync_thread_cond = PTHREAD_COND_INITIALIZER;
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this->sync_thread_idle_cond = PTHREAD_COND_INITIALIZER;
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this->sync_thread_lock = PTHREAD_MUTEX_INITIALIZER;
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this->mru_block = NULL;
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this->lru_block = NULL;
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this->dirty_block = NULL;
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for ( size_t i = 0; i < DEVICE_HASH_LENGTH; i++ )
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hash_blocks[i] = NULL;
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struct stat st;
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fstat(fd, &st);
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this->device_size = st.st_size;
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this->path = path;
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this->block_size = block_size;
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this->fd = fd;
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this->write = write;
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this->has_sync_thread = false;
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this->sync_thread_should_exit = false;
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this->sync_in_transit = false;
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this->block_count = 0;
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#ifdef __sortix__
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// TODO: This isn't scaleable if there's multiple filesystems mounted.
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size_t memory;
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memstat(NULL, &memory);
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this->block_limit = (memory / 10) / block_size;
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#else
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this->block_limit = 32768;
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#endif
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}
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Device::~Device()
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{
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if ( has_sync_thread )
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{
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pthread_mutex_lock(&sync_thread_lock);
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sync_thread_should_exit = true;
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pthread_cond_signal(&sync_thread_cond);
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pthread_mutex_unlock(&sync_thread_lock);
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pthread_join(sync_thread, NULL);
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has_sync_thread = false;
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}
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Sync();
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while ( mru_block )
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delete mru_block;
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close(fd);
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}
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void Device::SpawnSyncThread()
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{
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if ( this->has_sync_thread )
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return;
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this->has_sync_thread = write &&
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pthread_create(&this->sync_thread, NULL, Device__SyncThread, this) == 0;
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}
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Block* Device::AllocateBlock()
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{
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if ( block_limit <= block_count )
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{
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for ( Block* block = lru_block; block; block = block->prev_block )
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{
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if ( block->reference_count )
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continue;
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block->Destruct(); // Syncs.
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return block;
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}
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}
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uint8_t* data = new uint8_t[block_size];
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if ( !data ) // TODO: Use operator new nothrow!
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return NULL;
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Block* block = new Block();
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if ( !block ) // TODO: Use operator new nothrow!
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return delete[] data, (Block*) NULL;
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block->block_data = data;
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block_count++;
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return block;
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}
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Block* Device::GetBlock(uint32_t block_id)
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{
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if ( Block* block = GetCachedBlock(block_id) )
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return block;
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Block* block = AllocateBlock();
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if ( !block )
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return NULL;
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block->Construct(this, block_id);
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off_t file_offset = (off_t) block_size * (off_t) block_id;
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preadall(fd, block->block_data, block_size, file_offset);
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block->Prelink();
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return block;
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}
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Block* Device::GetBlockZeroed(uint32_t block_id)
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{
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assert(write);
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if ( Block* block = GetCachedBlock(block_id) )
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{
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block->BeginWrite();
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memset(block->block_data, 0, block_size);
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block->FinishWrite();
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return block;
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}
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Block* block = AllocateBlock();
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if ( !block )
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return NULL;
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block->Construct(this, block_id);
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memset(block->block_data, 0, block_size);
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block->Prelink();
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block->BeginWrite();
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block->FinishWrite();
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return block;
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}
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Block* Device::GetCachedBlock(uint32_t block_id)
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{
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size_t bin = block_id % DEVICE_HASH_LENGTH;
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for ( Block* iter = hash_blocks[bin]; iter; iter = iter->next_hashed )
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if ( iter->block_id == block_id )
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return iter->Refer(), iter;
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return NULL;
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}
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void Device::Sync()
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{
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if ( has_sync_thread )
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{
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pthread_mutex_lock(&sync_thread_lock);
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while ( dirty_block || sync_in_transit )
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pthread_cond_wait(&sync_thread_cond, &sync_thread_lock);
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pthread_mutex_unlock(&sync_thread_lock);
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fsync(fd);
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return;
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}
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while ( dirty_block )
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dirty_block->Sync();
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fsync(fd);
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}
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void Device::SyncThread()
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{
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uint8_t transit_block_data[block_size];
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pthread_mutex_lock(&sync_thread_lock);
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while ( true )
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{
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while ( !(dirty_block || sync_thread_should_exit) )
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pthread_cond_wait(&sync_thread_cond, &sync_thread_lock);
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if ( sync_thread_should_exit )
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break;
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Block* block = dirty_block;
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if ( block->next_dirty )
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block->next_dirty->prev_dirty = NULL;
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dirty_block = block->next_dirty;
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block->next_dirty = NULL;
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block->dirty = false;
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block->is_in_transit = true;
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sync_in_transit = true;
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pthread_mutex_unlock(&sync_thread_lock);
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pthread_mutex_lock(&block->modify_lock);
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memcpy(transit_block_data, block->block_data, block_size);
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pthread_mutex_unlock(&block->modify_lock);
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off_t offset = (off_t) block_size * (off_t) block->block_id;
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pwriteall(fd, transit_block_data, block_size, offset);
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pthread_mutex_lock(&sync_thread_lock);
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block->is_in_transit = false;
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sync_in_transit = false;
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pthread_cond_signal(&block->transit_done_cond);
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if ( !dirty_block )
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pthread_cond_signal(&sync_thread_idle_cond);
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}
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pthread_mutex_unlock(&sync_thread_lock);
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}
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