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Add ring_loop

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This commit is contained in:
Vitaliy Filippov
2019-11-05 02:12:04 +03:00
parent c959948c82
commit 351366d228
8 changed files with 190 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
blockstore_read.cpp
+21 -20
View File
@@ -1,6 +1,6 @@
#include "blockstore.h"
int blockstore::fulfill_read_push(blockstore_operation & read_op, uint32_t item_start,
int blockstore::fulfill_read_push(blockstore_operation *read_op, uint32_t item_start,
uint32_t item_state, uint64_t item_version, uint64_t item_location, uint32_t cur_start, uint32_t cur_end)
{
if (cur_end > cur_start)
@@ -8,49 +8,50 @@ int blockstore::fulfill_read_push(blockstore_operation & read_op, uint32_t item_
if (item_state == ST_IN_FLIGHT)
{
// Pause until it's written somewhere
read_op.wait_for = WAIT_IN_FLIGHT;
read_op.wait_version = item_version;
read_op->wait_for = WAIT_IN_FLIGHT;
read_op->wait_version = item_version;
return -1;
}
else if (item_state == ST_DEL_WRITTEN || item_state == ST_DEL_SYNCED || item_state == ST_DEL_MOVED)
{
// item is unallocated - return zeroes
memset(read_op.buf + cur_start - read_op.offset, 0, cur_end - cur_start);
memset(read_op->buf + cur_start - read_op->offset, 0, cur_end - cur_start);
return 0;
}
struct io_uring_sqe *sqe = io_uring_get_sqe(ring);
struct io_uring_sqe *sqe = get_sqe();
if (!sqe)
{
// Pause until there are more requests available
read_op.wait_for = WAIT_SQE;
read_op->wait_for = WAIT_SQE;
return -1;
}
read_op.read_vec[cur_start] = (struct iovec){
read_op.buf + cur_start - read_op.offset,
read_op->read_vec[cur_start] = (struct iovec){
read_op->buf + cur_start - read_op->offset,
cur_end - cur_start
};
// Тут 2 вопроса - 1) куда сохранить iovec 2) как потом сопоставить i/o и cqe
io_uring_prep_readv(
sqe,
IS_JOURNAL(item_state) ? journal_fd : data_fd,
// FIXME: &read_op.read_vec is forbidden
&read_op.read_vec[cur_start], 1,
// FIXME: &read_op->read_vec is forbidden
&read_op->read_vec[cur_start], 1,
(IS_JOURNAL(item_state) ? journal_offset : data_offset) + item_location + cur_start - item_start
);
io_uring_sqe_set_data(sqe, 0/*read op link*/);
((ring_data_t*)(sqe->user_data))->op = read_op;
}
return 0;
}
int blockstore::fulfill_read(blockstore_operation & read_op, uint32_t item_start, uint32_t item_end,
int blockstore::fulfill_read(blockstore_operation *read_op, uint32_t item_start, uint32_t item_end,
uint32_t item_state, uint64_t item_version, uint64_t item_location)
{
uint32_t cur_start = item_start;
if (cur_start < read_op.offset + read_op.len && item_end > read_op.offset)
if (cur_start < read_op->offset + read_op->len && item_end > read_op->offset)
{
cur_start = cur_start < read_op.offset ? read_op.offset : cur_start;
item_end = item_end > read_op.offset + read_op.len ? read_op.offset + read_op.len : item_end;
auto fulfill_near = read_op.read_vec.lower_bound(cur_start);
if (fulfill_near != read_op.read_vec.begin())
cur_start = cur_start < read_op->offset ? read_op->offset : cur_start;
item_end = item_end > read_op->offset + read_op->len ? read_op->offset + read_op->len : item_end;
auto fulfill_near = read_op->read_vec.lower_bound(cur_start);
if (fulfill_near != read_op->read_vec.begin())
{
fulfill_near--;
if (fulfill_near->first + fulfill_near->second.iov_len <= cur_start)
@@ -58,7 +59,7 @@ int blockstore::fulfill_read(blockstore_operation & read_op, uint32_t item_start
fulfill_near++;
}
}
while (fulfill_near != read_op.read_vec.end() && fulfill_near->first < item_end)
while (fulfill_near != read_op->read_vec.end() && fulfill_near->first < item_end)
{
if (fulfill_read_push(read_op, item_start, item_state, item_version, item_location, cur_start, fulfill_near->first) < 0)
{
@@ -95,7 +96,7 @@ int blockstore::read(blockstore_operation *read_op)
{
if (read_op->flags == OP_READ_DIRTY || IS_STABLE(dirty[i].state))
{
if (fulfill_read(*read_op, dirty[i].offset, dirty[i].offset + dirty[i].size, dirty[i].state, dirty[i].version, dirty[i].location) < 0)
if (fulfill_read(read_op, dirty[i].offset, dirty[i].offset + dirty[i].size, dirty[i].state, dirty[i].version, dirty[i].location) < 0)
{
// need to wait for something, undo added requests and requeue op
ring->sq.sqe_tail = prev_sqe_pos;
@@ -108,7 +109,7 @@ int blockstore::read(blockstore_operation *read_op)
}
if (clean_it != object_db.end())
{
if (fulfill_read(*read_op, 0, block_size, ST_CURRENT, 0, clean_it->second.location) < 0)
if (fulfill_read(read_op, 0, block_size, ST_CURRENT, 0, clean_it->second.location) < 0)
{
// need to wait for something, undo added requests and requeue op
ring->sq.sqe_tail = prev_sqe_pos;