forked from vitalif/vitastor
138 lines
4.9 KiB
C++
138 lines
4.9 KiB
C++
#include "blockstore.h"
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int blockstore::fulfill_read_push(blockstore_operation *read_op, uint32_t item_start,
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uint32_t item_state, uint64_t item_version, uint64_t item_location, uint32_t cur_start, uint32_t cur_end)
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{
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if (cur_end > cur_start)
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{
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if (item_state == ST_IN_FLIGHT)
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{
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// Pause until it's written somewhere
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read_op->wait_for = WAIT_IN_FLIGHT;
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read_op->wait_version = item_version;
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return -1;
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}
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else if (item_state == ST_DEL_WRITTEN || item_state == ST_DEL_SYNCED || item_state == ST_DEL_MOVED)
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{
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// item is unallocated - return zeroes
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memset(read_op->buf + cur_start - read_op->offset, 0, cur_end - cur_start);
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return 0;
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}
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struct io_uring_sqe *sqe = get_sqe();
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if (!sqe)
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{
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// Pause until there are more requests available
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read_op->wait_for = WAIT_SQE;
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return -1;
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}
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struct ring_data_t *data = ((ring_data_t*)sqe->user_data);
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data->iov = (struct iovec){
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read_op->buf + cur_start - read_op->offset,
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cur_end - cur_start
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};
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read_op->read_vec[cur_start] = data->iov;
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io_uring_prep_readv(
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sqe,
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IS_JOURNAL(item_state) ? journal_fd : data_fd,
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&data->iov, 1,
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(IS_JOURNAL(item_state) ? journal_offset : data_offset) + item_location + cur_start - item_start
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);
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data->op = read_op;
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}
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return 0;
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}
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int blockstore::fulfill_read(blockstore_operation *read_op, uint32_t item_start, uint32_t item_end,
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uint32_t item_state, uint64_t item_version, uint64_t item_location)
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{
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uint32_t cur_start = item_start;
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if (cur_start < read_op->offset + read_op->len && item_end > read_op->offset)
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{
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cur_start = cur_start < read_op->offset ? read_op->offset : cur_start;
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item_end = item_end > read_op->offset + read_op->len ? read_op->offset + read_op->len : item_end;
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auto fulfill_near = read_op->read_vec.lower_bound(cur_start);
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if (fulfill_near != read_op->read_vec.begin())
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{
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fulfill_near--;
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if (fulfill_near->first + fulfill_near->second.iov_len <= cur_start)
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{
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fulfill_near++;
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}
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}
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while (fulfill_near != read_op->read_vec.end() && fulfill_near->first < item_end)
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{
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if (fulfill_read_push(read_op, item_start, item_state, item_version, item_location, cur_start, fulfill_near->first) < 0)
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{
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return -1;
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}
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cur_start = fulfill_near->first + fulfill_near->second.iov_len;
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fulfill_near++;
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}
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if (fulfill_read_push(read_op, item_start, item_state, item_version, item_location, cur_start, item_end) < 0)
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{
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return -1;
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}
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}
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return 0;
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}
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int blockstore::dequeue_read(blockstore_operation *read_op)
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{
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auto clean_it = object_db.find(read_op->oid);
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auto dirty_it = dirty_queue.find(read_op->oid);
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if (clean_it == object_db.end() && dirty_it == dirty_queue.end())
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{
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// region is not allocated - return zeroes
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memset(read_op->buf, 0, read_op->len);
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read_op->retval = read_op->len;
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read_op->callback(read_op);
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return 1;
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}
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unsigned prev_sqe_pos = ringloop->ring->sq.sqe_tail;
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uint64_t fulfilled = 0;
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if (dirty_it != dirty_queue.end())
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{
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dirty_list dirty = dirty_it->second;
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for (int i = dirty.size()-1; i >= 0; i--)
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{
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if ((read_op->flags & OP_TYPE_MASK) == OP_READ_DIRTY || IS_STABLE(dirty[i].state))
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{
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if (fulfill_read(read_op, dirty[i].offset, dirty[i].offset + dirty[i].size, dirty[i].state, dirty[i].version, dirty[i].location) < 0)
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{
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// need to wait. undo added requests, don't dequeue op
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ringloop->ring->sq.sqe_tail = prev_sqe_pos;
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read_op->read_vec.clear();
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return 0;
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}
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}
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}
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}
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if (clean_it != object_db.end())
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{
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if (fulfill_read(read_op, 0, block_size, ST_CURRENT, 0, clean_it->second.location) < 0)
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{
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// need to wait. undo added requests, don't dequeue op
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ringloop->ring->sq.sqe_tail = prev_sqe_pos;
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read_op->read_vec.clear();
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return 0;
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}
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}
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if (!read_op->read_vec.size())
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{
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// region is not allocated - return zeroes
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memset(read_op->buf, 0, read_op->len);
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read_op->retval = read_op->len;
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read_op->callback(read_op);
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return 1;
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}
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read_op->retval = 0;
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read_op->pending_ops = read_op->read_vec.size();
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in_process_ops.insert(read_op);
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int ret = ringloop->submit();
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if (ret < 0)
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{
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throw new std::runtime_error(std::string("io_uring_submit: ") + strerror(-ret));
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}
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return 1;
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}
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