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225 lines
8.2 KiB
C++
225 lines
8.2 KiB
C++
#include "blockstore.h"
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void blockstore::enqueue_write(blockstore_operation *op)
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{
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// Assign version number
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bool found = false;
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if (dirty_db.size() > 0)
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{
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auto dirty_it = dirty_db.upper_bound((obj_ver_id){
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.oid = op->oid,
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.version = UINT64_MAX,
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});
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dirty_it--; // segfaults when dirty_db is empty
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if (dirty_it != dirty_db.end() && dirty_it->first.oid == op->oid)
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{
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found = true;
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op->version = dirty_it->first.version + 1;
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}
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}
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if (!found)
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{
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auto clean_it = clean_db.find(op->oid);
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if (clean_it != clean_db.end())
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{
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op->version = clean_it->second.version + 1;
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}
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else
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{
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op->version = 1;
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}
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}
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// Immediately add the operation into dirty_db, so subsequent reads could see it
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#ifdef BLOCKSTORE_DEBUG
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printf("Write %lu:%lu v%lu\n", op->oid.inode, op->oid.stripe, op->version);
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#endif
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dirty_db.emplace((obj_ver_id){
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.oid = op->oid,
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.version = op->version,
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}, (dirty_entry){
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.state = ST_IN_FLIGHT,
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.flags = 0,
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.location = 0,
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.offset = op->offset,
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.len = op->len,
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.journal_sector = 0,
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});
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}
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// First step of the write algorithm: dequeue operation and submit initial write(s)
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int blockstore::dequeue_write(blockstore_operation *op)
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{
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auto dirty_it = dirty_db.find((obj_ver_id){
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.oid = op->oid,
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.version = op->version,
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});
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if (op->len == block_size || op->version == 1)
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{
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// Big (redirect) write
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uint64_t loc = data_alloc->find_free();
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if (loc == UINT64_MAX)
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{
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// no space
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if (flusher->is_active())
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{
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// hope that some space will be available after flush
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op->wait_for = WAIT_FREE;
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return 0;
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}
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op->retval = -ENOSPC;
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op->callback(op);
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return 1;
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}
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BS_SUBMIT_GET_SQE(sqe, data);
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dirty_it->second.location = loc << block_order;
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dirty_it->second.state = ST_D_SUBMITTED;
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#ifdef BLOCKSTORE_DEBUG
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printf("Allocate block %lu\n", loc);
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#endif
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data_alloc->set(loc, true);
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int vcnt = 0;
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if (op->version == 1 && op->len != block_size)
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{
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// Zero fill newly allocated object. First write is always a big write
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// FIXME: Add "no-zero-fill" mode which will just leave random garbage (insecure, but may be useful)
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if (op->offset > 0)
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op->iov_zerofill[vcnt++] = (struct iovec){ zero_object, op->offset };
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op->iov_zerofill[vcnt++] = (struct iovec){ op->buf, op->len };
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if (op->offset+op->len < block_size)
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op->iov_zerofill[vcnt++] = (struct iovec){ zero_object, block_size - (op->offset + op->len) };
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data->iov.iov_len = block_size;
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}
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else
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{
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vcnt = 1;
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op->iov_zerofill[0] = (struct iovec){ op->buf, op->len };
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data->iov.iov_len = op->len; // to check it in the callback
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}
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data->callback = [this, op](ring_data_t *data) { handle_write_event(data, op); };
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my_uring_prep_writev(
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sqe, data_fd, op->iov_zerofill, vcnt, data_offset + (loc << block_order)
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);
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op->pending_ops = 1;
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op->min_used_journal_sector = op->max_used_journal_sector = 0;
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// Remember big write as unsynced
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unsynced_big_writes.push_back((obj_ver_id){
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.oid = op->oid,
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.version = op->version,
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});
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}
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else
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{
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// Small (journaled) write
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// First check if the journal has sufficient space
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// FIXME Always two SQEs for now. Although it's possible to send 1 sometimes
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//two_sqes = (512 - journal.in_sector_pos < sizeof(struct journal_entry_small_write)
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// ? (journal.len - next_pos < op->len)
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// : (journal.sector_info[journal.cur_sector].offset + 512 != journal.next_free ||
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// journal.len - next_pos < op->len);
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blockstore_journal_check_t space_check(this);
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if (!space_check.check_available(op, 1, sizeof(journal_entry_small_write), op->len))
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{
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return 0;
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}
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// There is sufficient space. Get SQE(s)
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BS_SUBMIT_GET_ONLY_SQE(sqe1);
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BS_SUBMIT_GET_SQE(sqe2, data2);
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// Got SQEs. Prepare journal sector write
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journal_entry_small_write *je = (journal_entry_small_write*)
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prefill_single_journal_entry(journal, JE_SMALL_WRITE, sizeof(struct journal_entry_small_write));
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dirty_it->second.journal_sector = journal.sector_info[journal.cur_sector].offset;
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journal.used_sectors[journal.sector_info[journal.cur_sector].offset]++;
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#ifdef BLOCKSTORE_DEBUG
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printf("journal offset %lu is used by %lu:%lu v%lu\n", dirty_it->second.journal_sector, dirty_it->first.oid.inode, dirty_it->first.oid.stripe, dirty_it->first.version);
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#endif
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// Figure out where data will be
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journal.next_free = (journal.next_free + op->len) <= journal.len ? journal.next_free : 512;
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je->oid = op->oid;
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je->version = op->version;
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je->offset = op->offset;
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je->len = op->len;
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je->data_offset = journal.next_free;
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je->crc32_data = crc32c(0, op->buf, op->len);
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je->crc32 = je_crc32((journal_entry*)je);
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journal.crc32_last = je->crc32;
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auto cb = [this, op](ring_data_t *data) { handle_write_event(data, op); };
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prepare_journal_sector_write(journal, sqe1, cb);
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op->min_used_journal_sector = op->max_used_journal_sector = 1 + journal.cur_sector;
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// Prepare journal data write
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if (journal.inmemory)
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{
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// Copy data
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memcpy(journal.buffer + journal.next_free, op->buf, op->len);
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}
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data2->iov = (struct iovec){ op->buf, op->len };
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data2->callback = cb;
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my_uring_prep_writev(
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sqe2, journal.fd, &data2->iov, 1, journal.offset + journal.next_free
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);
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dirty_it->second.location = journal.next_free;
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dirty_it->second.state = ST_J_SUBMITTED;
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journal.next_free += op->len;
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if (journal.next_free >= journal.len)
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journal.next_free = 512;
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op->pending_ops = 2;
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// Remember small write as unsynced
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unsynced_small_writes.push_back((obj_ver_id){
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.oid = op->oid,
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.version = op->version,
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});
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}
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return 1;
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}
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void blockstore::handle_write_event(ring_data_t *data, blockstore_operation *op)
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{
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if (data->res != data->iov.iov_len)
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{
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// FIXME: our state becomes corrupted after a write error. maybe do something better than just die
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throw std::runtime_error(
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"write operation failed ("+std::to_string(data->res)+" != "+std::to_string(data->iov.iov_len)+
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"). in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111"
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);
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}
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op->pending_ops--;
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if (op->pending_ops == 0)
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{
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// Release used journal sectors
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if (op->min_used_journal_sector > 0)
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{
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uint64_t s = op->min_used_journal_sector;
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while (1)
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{
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journal.sector_info[s-1].usage_count--;
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if (s == op->max_used_journal_sector)
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break;
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s = 1 + s % journal.sector_count;
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}
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op->min_used_journal_sector = op->max_used_journal_sector = 0;
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}
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// Switch object state
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auto & dirty_entry = dirty_db[(obj_ver_id){
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.oid = op->oid,
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.version = op->version,
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}];
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#ifdef BLOCKSTORE_DEBUG
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printf("Ack write %lu:%lu v%lu = %d\n", op->oid.inode, op->oid.stripe, op->version, dirty_entry.state);
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#endif
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if (dirty_entry.state == ST_J_SUBMITTED)
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{
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dirty_entry.state = ST_J_WRITTEN;
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}
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else if (dirty_entry.state == ST_D_SUBMITTED)
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{
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dirty_entry.state = ST_D_WRITTEN;
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}
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else if (dirty_entry.state == ST_DEL_SUBMITTED)
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{
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dirty_entry.state = ST_DEL_WRITTEN;
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}
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// Acknowledge write without sync
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op->retval = op->len;
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op->callback(op);
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}
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}
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