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Move handle_event code into _read.cpp, _write.cpp; move sync code into _sync.cpp

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This commit is contained in:
Vitaliy Filippov
2019-11-10 02:27:27 +03:00
parent 8e634d5b74
commit 24f5d71595
6 changed files with 324 additions and 223 deletions
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blockstore_sync.cpp
+190
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@@ -0,0 +1,190 @@
#include "blockstore.h"
#define SYNC_NO_BIG 1
#define SYNC_HAS_BIG 2
#define SYNC_DATA_SYNC_SENT 3
#define SYNC_JOURNAL_SYNC_SENT 4
#define SYNC_DONE 5
int blockstore::dequeue_sync(blockstore_operation *op)
{
if (op->sync_state == 0)
{
op->big_write_count = 0;
op->sync_state = SYNC_NO_BIG;
op->sync_writes.swap(unsynced_writes);
unsynced_writes.clear();
if (op->sync_writes.size() == 0)
{
op->sync_state = SYNC_DONE;
}
auto it = op->sync_writes.begin();
while (it != op->sync_writes.end())
{
uint32_t state = dirty_db[*it].state;
if (IS_BIG_WRITE(state))
{
op->big_write_count++;
op->sync_state = SYNC_HAS_BIG;
}
it++;
}
}
if (op->sync_state == SYNC_NO_BIG)
{
// No big writes, just fsync the journal
BS_SUBMIT_GET_SQE(sqe, data);
io_uring_prep_fsync(sqe, journal.fd, 0);
data->op = op;
op->pending_ops = 1;
op->sync_state = SYNC_JOURNAL_SYNC_SENT;
}
else if (op->sync_state == SYNC_HAS_BIG)
{
// 1st step: fsync data
BS_SUBMIT_GET_SQE(sqe, data);
io_uring_prep_fsync(sqe, data_fd, 0);
data->op = op;
op->pending_ops = 1;
op->sync_state = SYNC_DATA_SYNC_SENT;
}
else if (op->sync_state == SYNC_DATA_SYNC_SENT)
{
// 2nd step: Data device is synced, prepare & write journal entries
// Check space in the journal and journal memory buffers
int required = op->big_write_count, sectors_required = 1;
uint64_t next_pos = journal.next_free, next_sector = journal.cur_sector;
while (1)
{
int fits = (512 - journal.in_sector_pos) / sizeof(journal_entry_big_write);
required -= fits;
if (required <= 0)
break;
next_pos = (next_pos+512) < journal.len ? next_pos+512 : 512;
sectors_required++;
next_sector = ((next_sector + 1) % journal.sector_count);
if (journal.sector_info[next_sector].usage_count > 0)
{
// No memory buffer available. Wait for it.
op->wait_for = WAIT_JOURNAL_BUFFER;
return 0;
}
}
if (next_pos >= journal.used_start)
{
// No space in the journal. Wait for it.
op->wait_for = WAIT_JOURNAL;
op->wait_detail = next_pos;
return 0;
}
// Get SQEs. Don't bother about merging, submit each journal sector as a separate request
struct io_uring_sqe *sqe[sectors_required+1];
for (int i = 0; i < sectors_required+1; i++)
{
BS_SUBMIT_GET_SQE_DECL(sqe[i]);
}
// Prepare and submit journal entries
op->min_used_journal_sector = 1 + journal.cur_sector;
sectors_required = 0;
required = op->big_write_count;
// FIXME: advance it
auto it = op->sync_writes.begin();
while (1)
{
int fits = (512 - journal.in_sector_pos) / sizeof(journal_entry_big_write);
while (fits > 0 && required > 0)
{
journal_entry_big_write *je = (journal_entry_big_write*)(
journal.sector_buf + 512*journal.cur_sector + journal.in_sector_pos
);
*je = {
.crc32 = 0,
.magic = JOURNAL_MAGIC,
.type = JE_BIG_WRITE,
.size = sizeof(journal_entry_big_write),
.crc32_prev = journal.crc32_last,
.oid = it->oid,
.version = it->version,
.block = dirty_db[*it].location,
};
je->crc32 = je_crc32((journal_entry*)je);
journal.crc32_last = je->crc32;
journal.in_sector_pos += sizeof(journal_entry_big_write);
required--;
}
if (required <= 0)
break;
journal.sector_info[journal.cur_sector].usage_count++;
struct ring_data_t *data = ((ring_data_t*)sqe[sectors_required]->user_data);
data->iov = (struct iovec){ journal.sector_buf + 512*journal.cur_sector, 512 };
data->op = op;
io_uring_prep_writev(
sqe[sectors_required], journal.fd, &data->iov, 1, journal.offset + journal.sector_info[journal.cur_sector].offset
);
journal.cur_sector = ((journal.cur_sector + 1) % journal.sector_count);
journal.sector_info[journal.cur_sector].offset = journal.next_free;
journal.in_sector_pos = 0;
journal.next_free = (journal.next_free + 512) < journal.len ? journal.next_free + 512 : 512;
memset(journal.sector_buf + 512*journal.cur_sector, 0, 512);
sectors_required++;
}
// ... And a journal fsync
io_uring_prep_fsync(sqe[sectors_required], journal.fd, 0);
struct ring_data_t *data = ((ring_data_t*)sqe[sectors_required]->user_data);
data->op = op;
op->pending_ops = 1 + sectors_required;
op->max_used_journal_sector = 1 + journal.cur_sector;
op->sync_state = SYNC_JOURNAL_SYNC_SENT;
}
// FIXME: resubmit op from in_progress
op->prev_sync_count = in_progress_syncs.size();
op->in_progress_ptr = in_progress_syncs.insert(in_progress_syncs.end(), op);
return 1;
}
void blockstore::handle_sync_event(ring_data_t *data, blockstore_operation *op)
{
if (data->res < 0)
{
// sync error
// FIXME: our state becomes corrupted after a write error. maybe do something better than just die
throw new std::runtime_error("write operation failed. in-memory state is corrupted. AAAAAAAaaaaaaaaa!!!111");
}
op->pending_ops--;
if (op->min_used_journal_sector > 0)
{
for (uint64_t s = op->min_used_journal_sector; s != op->max_used_journal_sector; s = (s + 1) % journal.sector_count)
{
journal.sector_info[s-1].usage_count--;
}
op->min_used_journal_sector = op->max_used_journal_sector = 0;
}
if (op->pending_ops == 0)
{
// Acknowledge sync
auto it = op->in_progress_ptr;
int done_syncs = 1;
++it;
while (it != in_progress_syncs.end())
{
auto & next_sync = *it;
next_sync->prev_sync_count -= done_syncs;
if (next_sync->prev_sync_count == 0/* && next_sync->DONE*/)
{
done_syncs++;
auto next_it = it;
it++;
in_progress_syncs.erase(next_it);
next_sync->retval = 0;
next_sync->callback(next_sync);
in_progress_ops.erase(next_sync);
}
else
it++;
}
in_progress_syncs.erase(op->in_progress_ptr);
op->retval = 0;
op->callback(op);
in_progress_ops.erase(op);
}
}