669 lines
22 KiB
C++
669 lines
22 KiB
C++
#include "osd_primary.h"
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// read: read directly or read paired stripe(s), reconstruct, return
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// write: read paired stripe(s), reconstruct, modify, calculate parity, write
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//
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// nuance: take care to read the same version from paired stripes!
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// to do so, we remember "last readable" version until a write request completes
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// and we postpone other write requests to the same stripe until completion of previous ones
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//
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// sync: sync peers, get unstable versions, stabilize them
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bool osd_t::prepare_primary_rw(osd_op_t *cur_op)
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{
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// PG number is calculated from the offset
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// Our EC scheme stores data in fixed chunks equal to (K*block size)
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// But we must not use K in the process of calculating the PG number
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// So we calculate the PG number using a separate setting which should be per-inode (FIXME)
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pg_num_t pg_num = (cur_op->req.rw.inode + cur_op->req.rw.offset / pg_stripe_size) % pg_count + 1;
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auto pg_it = pgs.find(pg_num);
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if (pg_it == pgs.end() || !(pg_it->second.state & PG_ACTIVE))
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{
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// This OSD is not primary for this PG or the PG is inactive
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finish_op(cur_op, -EPIPE);
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return false;
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}
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uint64_t pg_block_size = bs_block_size * pg_it->second.pg_minsize;
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object_id oid = {
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.inode = cur_op->req.rw.inode,
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// oid.stripe = starting offset of the parity stripe, so it can be mapped back to the PG
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.stripe = (cur_op->req.rw.offset / pg_stripe_size) * pg_stripe_size +
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((cur_op->req.rw.offset % pg_stripe_size) / pg_block_size) * pg_block_size
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};
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if ((cur_op->req.rw.offset + cur_op->req.rw.len) > (oid.stripe + pg_block_size) ||
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(cur_op->req.rw.offset % bs_disk_alignment) != 0 ||
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(cur_op->req.rw.len % bs_disk_alignment) != 0)
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{
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finish_op(cur_op, -EINVAL);
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return false;
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}
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osd_primary_op_data_t *op_data = (osd_primary_op_data_t*)calloc(
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sizeof(osd_primary_op_data_t) + sizeof(osd_rmw_stripe_t) * pg_it->second.pg_size, 1
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);
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op_data->pg_num = pg_num;
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op_data->oid = oid;
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op_data->stripes = ((osd_rmw_stripe_t*)(op_data+1));
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cur_op->op_data = op_data;
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split_stripes(pg_it->second.pg_minsize, bs_block_size, (uint32_t)(cur_op->req.rw.offset - oid.stripe), cur_op->req.rw.len, op_data->stripes);
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pg_it->second.inflight++;
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return true;
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}
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static uint64_t* get_object_osd_set(pg_t &pg, object_id &oid, uint64_t *def, pg_osd_set_state_t **object_state)
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{
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if (!(pg.state & (PG_HAS_INCOMPLETE | PG_HAS_DEGRADED | PG_HAS_MISPLACED)))
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{
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*object_state = NULL;
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return def;
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}
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auto st_it = pg.incomplete_objects.find(oid);
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if (st_it != pg.incomplete_objects.end())
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{
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*object_state = st_it->second;
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return st_it->second->read_target.data();
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}
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st_it = pg.degraded_objects.find(oid);
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if (st_it != pg.degraded_objects.end())
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{
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*object_state = st_it->second;
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return st_it->second->read_target.data();
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}
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st_it = pg.misplaced_objects.find(oid);
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if (st_it != pg.misplaced_objects.end())
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{
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*object_state = st_it->second;
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return st_it->second->read_target.data();
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}
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*object_state = NULL;
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return def;
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}
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void osd_t::continue_primary_read(osd_op_t *cur_op)
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{
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if (!cur_op->op_data && !prepare_primary_rw(cur_op))
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{
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return;
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}
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osd_primary_op_data_t *op_data = cur_op->op_data;
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if (op_data->st == 1) goto resume_1;
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else if (op_data->st == 2) goto resume_2;
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{
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auto & pg = pgs[op_data->pg_num];
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for (int role = 0; role < pg.pg_minsize; role++)
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{
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op_data->stripes[role].read_start = op_data->stripes[role].req_start;
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op_data->stripes[role].read_end = op_data->stripes[role].req_end;
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}
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// Determine version
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auto vo_it = pg.ver_override.find(op_data->oid);
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op_data->target_ver = vo_it != pg.ver_override.end() ? vo_it->second : UINT64_MAX;
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if (pg.state == PG_ACTIVE)
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{
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// Fast happy-path
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cur_op->buf = alloc_read_buffer(op_data->stripes, pg.pg_minsize, 0);
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submit_primary_subops(SUBMIT_READ, pg.pg_minsize, pg.cur_set.data(), cur_op);
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cur_op->send_list.push_back(cur_op->buf, cur_op->req.rw.len);
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op_data->st = 1;
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}
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else
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{
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// PG may be degraded or have misplaced objects
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uint64_t* cur_set = get_object_osd_set(pg, op_data->oid, pg.cur_set.data(), &op_data->object_state);
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if (extend_missing_stripes(op_data->stripes, cur_set, pg.pg_minsize, pg.pg_size) < 0)
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{
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finish_op(cur_op, -EIO);
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return;
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}
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// Submit reads
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op_data->pg_minsize = pg.pg_minsize;
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op_data->pg_size = pg.pg_size;
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op_data->degraded = 1;
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cur_op->buf = alloc_read_buffer(op_data->stripes, pg.pg_size, 0);
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submit_primary_subops(SUBMIT_READ, pg.pg_size, cur_set, cur_op);
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op_data->st = 1;
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}
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}
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resume_1:
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return;
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resume_2:
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if (op_data->errors > 0)
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{
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finish_op(cur_op, op_data->epipe > 0 ? -EPIPE : -EIO);
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return;
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}
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if (op_data->degraded)
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{
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// Reconstruct missing stripes
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// FIXME: Always EC(k+1) by now. Add different coding schemes
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osd_rmw_stripe_t *stripes = op_data->stripes;
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for (int role = 0; role < op_data->pg_minsize; role++)
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{
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if (stripes[role].read_end != 0 && stripes[role].missing)
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{
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reconstruct_stripe(stripes, op_data->pg_size, role);
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}
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if (stripes[role].req_end != 0)
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{
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// Send buffer in parts to avoid copying
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cur_op->send_list.push_back(
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stripes[role].read_buf + (stripes[role].req_start - stripes[role].read_start),
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stripes[role].req_end - stripes[role].req_start
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);
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}
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}
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}
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finish_op(cur_op, cur_op->req.rw.len);
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}
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bool osd_t::check_write_queue(osd_op_t *cur_op, pg_t & pg)
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{
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osd_primary_op_data_t *op_data = cur_op->op_data;
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// Check if actions are pending for this object
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auto act_it = pg.flush_actions.lower_bound((obj_piece_id_t){
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.oid = op_data->oid,
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.osd_num = 0,
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});
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if (act_it != pg.flush_actions.end() &&
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act_it->first.oid.inode == op_data->oid.inode &&
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(act_it->first.oid.stripe & ~STRIPE_MASK) == op_data->oid.stripe)
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{
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pg.write_queue.emplace(op_data->oid, cur_op);
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return false;
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}
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// Check if there are other write requests to the same object
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auto vo_it = pg.write_queue.find(op_data->oid);
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if (vo_it != pg.write_queue.end())
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{
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op_data->st = 1;
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pg.write_queue.emplace(op_data->oid, cur_op);
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return false;
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}
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pg.write_queue.emplace(op_data->oid, cur_op);
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return true;
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}
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void osd_t::continue_primary_write(osd_op_t *cur_op)
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{
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if (!cur_op->op_data && !prepare_primary_rw(cur_op))
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{
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return;
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}
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osd_primary_op_data_t *op_data = cur_op->op_data;
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auto & pg = pgs[op_data->pg_num];
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if (op_data->st == 1) goto resume_1;
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else if (op_data->st == 2) goto resume_2;
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else if (op_data->st == 3) goto resume_3;
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else if (op_data->st == 4) goto resume_4;
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else if (op_data->st == 5) goto resume_5;
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else if (op_data->st == 6) goto resume_6;
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else if (op_data->st == 7) goto resume_7;
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else if (op_data->st == 8) goto resume_8;
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else if (op_data->st == 9) goto resume_9;
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assert(op_data->st == 0);
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if (!check_write_queue(cur_op, pg))
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{
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return;
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}
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resume_1:
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// Determine blocks to read and write
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// Missing chunks are allowed to be overwritten even in incomplete objects
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// FIXME: Allow to do small writes to the old (degraded/misplaced) OSD set for the lower performance impact
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op_data->prev_set = get_object_osd_set(pg, op_data->oid, pg.cur_set.data(), &op_data->object_state);
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cur_op->rmw_buf = calc_rmw(cur_op->buf, op_data->stripes, op_data->prev_set,
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pg.pg_size, pg.pg_minsize, pg.pg_cursize, pg.cur_set.data(), bs_block_size);
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// Read required blocks
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submit_primary_subops(SUBMIT_RMW_READ, pg.pg_size, op_data->prev_set, cur_op);
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resume_2:
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op_data->st = 2;
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return;
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resume_3:
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if (op_data->errors > 0)
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{
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pg_cancel_write_queue(pg, cur_op, op_data->oid, op_data->epipe > 0 ? -EPIPE : -EIO);
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return;
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}
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// Save version override for parallel reads
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pg.ver_override[op_data->oid] = op_data->fact_ver;
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// Recover missing stripes, calculate parity
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calc_rmw_parity(op_data->stripes, pg.pg_size, op_data->prev_set, pg.cur_set.data(), bs_block_size);
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// Send writes
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submit_primary_subops(SUBMIT_WRITE, pg.pg_size, pg.cur_set.data(), cur_op);
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resume_4:
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op_data->st = 4;
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return;
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resume_5:
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if (op_data->errors > 0)
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{
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pg_cancel_write_queue(pg, cur_op, op_data->oid, op_data->epipe > 0 ? -EPIPE : -EIO);
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return;
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}
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if (op_data->fact_ver == 1)
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{
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// Object is created
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pg.clean_count++;
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pg.total_count++;
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}
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if (op_data->object_state)
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{
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{
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int recovery_type = op_data->object_state->state & (OBJ_DEGRADED|OBJ_INCOMPLETE) ? 0 : 1;
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recovery_stat_count[0][recovery_type]++;
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if (!recovery_stat_count[0][recovery_type])
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{
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recovery_stat_count[0][recovery_type]++;
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recovery_stat_bytes[0][recovery_type] = 0;
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}
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for (int role = 0; role < pg.pg_size; role++)
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{
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recovery_stat_bytes[0][recovery_type] += op_data->stripes[role].write_end - op_data->stripes[role].write_start;
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}
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}
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if (op_data->object_state->state & OBJ_MISPLACED)
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{
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// Remove extra chunks
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submit_primary_del_subops(cur_op, pg.cur_set.data(), op_data->object_state->osd_set);
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if (op_data->n_subops > 0)
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{
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resume_8:
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op_data->st = 8;
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return;
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resume_9:
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if (op_data->errors > 0)
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{
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pg_cancel_write_queue(pg, cur_op, op_data->oid, op_data->epipe > 0 ? -EPIPE : -EIO);
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return;
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}
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}
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}
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// Clear object state
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remove_object_from_state(op_data->oid, op_data->object_state, pg);
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pg.clean_count++;
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}
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// Remove version override
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pg.ver_override.erase(op_data->oid);
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// FIXME: Check for immediate_commit == IMMEDIATE_SMALL
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resume_6:
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resume_7:
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if (!remember_unstable_write(cur_op, pg, pg.cur_loc_set, 6))
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{
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return;
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}
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object_id oid = op_data->oid;
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finish_op(cur_op, cur_op->req.rw.len);
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// Continue other write operations to the same object
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auto next_it = pg.write_queue.find(oid);
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auto this_it = next_it;
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if (this_it != pg.write_queue.end() && this_it->second == cur_op)
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{
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next_it++;
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pg.write_queue.erase(this_it);
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if (next_it != pg.write_queue.end() && next_it->first == oid)
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{
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osd_op_t *next_op = next_it->second;
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continue_primary_write(next_op);
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}
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}
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}
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bool osd_t::remember_unstable_write(osd_op_t *cur_op, pg_t & pg, pg_osd_set_t & loc_set, int base_state)
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{
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osd_primary_op_data_t *op_data = cur_op->op_data;
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if (op_data->st == base_state)
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{
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goto resume_6;
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}
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else if (op_data->st == base_state+1)
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{
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goto resume_7;
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}
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if (immediate_commit == IMMEDIATE_ALL)
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{
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op_data->unstable_write_osds = new std::vector<unstable_osd_num_t>();
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op_data->unstable_writes = new obj_ver_id[loc_set.size()];
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{
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int last_start = 0;
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for (auto & chunk: loc_set)
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{
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op_data->unstable_writes[last_start] = (obj_ver_id){
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.oid = {
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.inode = op_data->oid.inode,
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.stripe = op_data->oid.stripe | chunk.role,
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},
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.version = op_data->fact_ver,
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};
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op_data->unstable_write_osds->push_back((unstable_osd_num_t){
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.osd_num = chunk.osd_num,
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.start = last_start,
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.len = 1,
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});
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last_start++;
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}
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}
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submit_primary_stab_subops(cur_op);
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resume_6:
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op_data->st = 6;
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return false;
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resume_7:
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// FIXME: Free those in the destructor?
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delete op_data->unstable_write_osds;
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delete[] op_data->unstable_writes;
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op_data->unstable_writes = NULL;
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op_data->unstable_write_osds = NULL;
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if (op_data->errors > 0)
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{
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pg_cancel_write_queue(pg, cur_op, op_data->oid, op_data->epipe > 0 ? -EPIPE : -EIO);
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return false;
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}
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}
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else
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{
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// Remember version as unstable
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for (auto & chunk: loc_set)
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{
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this->unstable_writes[(osd_object_id_t){
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.osd_num = chunk.osd_num,
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.oid = {
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.inode = op_data->oid.inode,
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.stripe = op_data->oid.stripe | chunk.role,
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},
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}] = op_data->fact_ver;
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}
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// Remember PG as dirty to drop the connection when PG goes offline
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// (this is required because of the "lazy sync")
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c_cli.clients[cur_op->peer_fd].dirty_pgs.insert(op_data->pg_num);
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dirty_pgs.insert(op_data->pg_num);
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}
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return true;
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}
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// Save and clear unstable_writes -> SYNC all -> STABLE all
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void osd_t::continue_primary_sync(osd_op_t *cur_op)
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{
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if (!cur_op->op_data)
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{
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cur_op->op_data = (osd_primary_op_data_t*)calloc(sizeof(osd_primary_op_data_t), 1);
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}
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osd_primary_op_data_t *op_data = cur_op->op_data;
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if (op_data->st == 1) goto resume_1;
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else if (op_data->st == 2) goto resume_2;
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else if (op_data->st == 3) goto resume_3;
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else if (op_data->st == 4) goto resume_4;
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else if (op_data->st == 5) goto resume_5;
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else if (op_data->st == 6) goto resume_6;
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assert(op_data->st == 0);
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if (syncs_in_progress.size() > 0)
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{
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// Wait for previous syncs, if any
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// FIXME: We may try to execute the current one in parallel, like in Blockstore, but I'm not sure if it matters at all
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syncs_in_progress.push_back(cur_op);
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op_data->st = 1;
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resume_1:
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return;
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}
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else
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{
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syncs_in_progress.push_back(cur_op);
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}
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resume_2:
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if (unstable_writes.size() == 0)
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{
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// Nothing to sync
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goto finish;
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}
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// Save and clear unstable_writes
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// In theory it is possible to do in on a per-client basis, but this seems to be an unnecessary complication
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// It would be cool not to copy these here at all, but someone has to deduplicate them by object IDs anyway
|
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{
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op_data->unstable_write_osds = new std::vector<unstable_osd_num_t>();
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op_data->unstable_writes = new obj_ver_id[this->unstable_writes.size()];
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op_data->dirty_pgs = new pg_num_t[dirty_pgs.size()];
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op_data->dirty_pg_count = dirty_pgs.size();
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osd_num_t last_osd = 0;
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int last_start = 0, last_end = 0;
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for (auto it = this->unstable_writes.begin(); it != this->unstable_writes.end(); it++)
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{
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if (last_osd != it->first.osd_num)
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{
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if (last_osd != 0)
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{
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op_data->unstable_write_osds->push_back((unstable_osd_num_t){
|
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.osd_num = last_osd,
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.start = last_start,
|
|
.len = last_end - last_start,
|
|
});
|
|
}
|
|
last_osd = it->first.osd_num;
|
|
last_start = last_end;
|
|
}
|
|
op_data->unstable_writes[last_end] = (obj_ver_id){
|
|
.oid = it->first.oid,
|
|
.version = it->second,
|
|
};
|
|
last_end++;
|
|
}
|
|
if (last_osd != 0)
|
|
{
|
|
op_data->unstable_write_osds->push_back((unstable_osd_num_t){
|
|
.osd_num = last_osd,
|
|
.start = last_start,
|
|
.len = last_end - last_start,
|
|
});
|
|
}
|
|
int dpg = 0;
|
|
for (auto dirty_pg_num: dirty_pgs)
|
|
{
|
|
pgs[dirty_pg_num].inflight++;
|
|
op_data->dirty_pgs[dpg++] = dirty_pg_num;
|
|
}
|
|
dirty_pgs.clear();
|
|
this->unstable_writes.clear();
|
|
}
|
|
if (immediate_commit != IMMEDIATE_ALL)
|
|
{
|
|
// SYNC
|
|
submit_primary_sync_subops(cur_op);
|
|
resume_3:
|
|
op_data->st = 3;
|
|
return;
|
|
resume_4:
|
|
if (op_data->errors > 0)
|
|
{
|
|
goto resume_6;
|
|
}
|
|
}
|
|
// Stabilize version sets
|
|
submit_primary_stab_subops(cur_op);
|
|
resume_5:
|
|
op_data->st = 5;
|
|
return;
|
|
resume_6:
|
|
if (op_data->errors > 0)
|
|
{
|
|
// Return objects back into the unstable write set
|
|
for (auto unstable_osd: *(op_data->unstable_write_osds))
|
|
{
|
|
for (int i = 0; i < unstable_osd.len; i++)
|
|
{
|
|
// Except those from peered PGs
|
|
auto & w = op_data->unstable_writes[i];
|
|
pg_num_t wpg = map_to_pg(w.oid);
|
|
if (pgs[wpg].state & PG_ACTIVE)
|
|
{
|
|
uint64_t & dest = this->unstable_writes[(osd_object_id_t){
|
|
.osd_num = unstable_osd.osd_num,
|
|
.oid = w.oid,
|
|
}];
|
|
dest = dest < w.version ? w.version : dest;
|
|
dirty_pgs.insert(wpg);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for (int i = 0; i < op_data->dirty_pg_count; i++)
|
|
{
|
|
auto & pg = pgs.at(op_data->dirty_pgs[i]);
|
|
pg.inflight--;
|
|
if ((pg.state & PG_STOPPING) && pg.inflight == 0 && !pg.flush_batch)
|
|
{
|
|
finish_stop_pg(pg);
|
|
}
|
|
}
|
|
// FIXME: Free those in the destructor?
|
|
delete op_data->dirty_pgs;
|
|
delete op_data->unstable_write_osds;
|
|
delete[] op_data->unstable_writes;
|
|
op_data->unstable_writes = NULL;
|
|
op_data->unstable_write_osds = NULL;
|
|
if (op_data->errors > 0)
|
|
{
|
|
finish_op(cur_op, op_data->epipe > 0 ? -EPIPE : -EIO);
|
|
}
|
|
else
|
|
{
|
|
finish:
|
|
if (cur_op->peer_fd)
|
|
{
|
|
auto it = c_cli.clients.find(cur_op->peer_fd);
|
|
if (it != c_cli.clients.end())
|
|
it->second.dirty_pgs.clear();
|
|
}
|
|
finish_op(cur_op, 0);
|
|
}
|
|
assert(syncs_in_progress.front() == cur_op);
|
|
syncs_in_progress.pop_front();
|
|
if (syncs_in_progress.size() > 0)
|
|
{
|
|
cur_op = syncs_in_progress.front();
|
|
op_data = cur_op->op_data;
|
|
op_data->st++;
|
|
goto resume_2;
|
|
}
|
|
}
|
|
|
|
// Decrement pg_osd_set_state_t's object_count and change PG state accordingly
|
|
void osd_t::remove_object_from_state(object_id & oid, pg_osd_set_state_t *object_state, pg_t & pg)
|
|
{
|
|
if (object_state->state & OBJ_INCOMPLETE)
|
|
{
|
|
// Successful write means that object is not incomplete anymore
|
|
this->incomplete_objects--;
|
|
pg.incomplete_objects.erase(oid);
|
|
if (!pg.incomplete_objects.size())
|
|
{
|
|
pg.state = pg.state & ~PG_HAS_INCOMPLETE;
|
|
report_pg_state(pg);
|
|
}
|
|
}
|
|
else if (object_state->state & OBJ_DEGRADED)
|
|
{
|
|
this->degraded_objects--;
|
|
pg.degraded_objects.erase(oid);
|
|
if (!pg.degraded_objects.size())
|
|
{
|
|
pg.state = pg.state & ~PG_HAS_DEGRADED;
|
|
report_pg_state(pg);
|
|
}
|
|
}
|
|
else if (object_state->state & OBJ_MISPLACED)
|
|
{
|
|
this->misplaced_objects--;
|
|
pg.misplaced_objects.erase(oid);
|
|
if (!pg.misplaced_objects.size())
|
|
{
|
|
pg.state = pg.state & ~PG_HAS_MISPLACED;
|
|
report_pg_state(pg);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
throw std::runtime_error("BUG: Invalid object state: "+std::to_string(object_state->state));
|
|
}
|
|
object_state->object_count--;
|
|
if (!object_state->object_count)
|
|
{
|
|
pg.state_dict.erase(object_state->osd_set);
|
|
}
|
|
}
|
|
|
|
void osd_t::continue_primary_del(osd_op_t *cur_op)
|
|
{
|
|
if (!cur_op->op_data && !prepare_primary_rw(cur_op))
|
|
{
|
|
return;
|
|
}
|
|
osd_primary_op_data_t *op_data = cur_op->op_data;
|
|
auto & pg = pgs[op_data->pg_num];
|
|
if (op_data->st == 1) goto resume_1;
|
|
else if (op_data->st == 2) goto resume_2;
|
|
else if (op_data->st == 3) goto resume_3;
|
|
else if (op_data->st == 4) goto resume_4;
|
|
else if (op_data->st == 5) goto resume_5;
|
|
assert(op_data->st == 0);
|
|
// Delete is forbidden even in active PGs if they're also degraded or have previous dead OSDs
|
|
if (pg.state & (PG_DEGRADED | PG_LEFT_ON_DEAD))
|
|
{
|
|
finish_op(cur_op, -EBUSY);
|
|
return;
|
|
}
|
|
if (!check_write_queue(cur_op, pg))
|
|
{
|
|
return;
|
|
}
|
|
resume_1:
|
|
// Determine which OSDs contain this object and delete it
|
|
op_data->prev_set = get_object_osd_set(pg, op_data->oid, pg.cur_set.data(), &op_data->object_state);
|
|
// Submit 1 read to determine the actual version number
|
|
submit_primary_subops(SUBMIT_RMW_READ, pg.pg_size, op_data->prev_set, cur_op);
|
|
resume_2:
|
|
op_data->st = 2;
|
|
return;
|
|
resume_3:
|
|
if (op_data->errors > 0)
|
|
{
|
|
pg_cancel_write_queue(pg, cur_op, op_data->oid, op_data->epipe > 0 ? -EPIPE : -EIO);
|
|
return;
|
|
}
|
|
// Save version override for parallel reads
|
|
pg.ver_override[op_data->oid] = op_data->fact_ver;
|
|
// Submit deletes
|
|
op_data->fact_ver++;
|
|
submit_primary_del_subops(cur_op, NULL, op_data->object_state ? op_data->object_state->osd_set : pg.cur_loc_set);
|
|
resume_4:
|
|
op_data->st = 4;
|
|
return;
|
|
resume_5:
|
|
if (op_data->errors > 0)
|
|
{
|
|
pg_cancel_write_queue(pg, cur_op, op_data->oid, op_data->epipe > 0 ? -EPIPE : -EIO);
|
|
return;
|
|
}
|
|
// Remove version override
|
|
pg.ver_override.erase(op_data->oid);
|
|
// Adjust PG stats after "instant stabilize", because we need object_state above
|
|
if (!op_data->object_state)
|
|
{
|
|
pg.clean_count--;
|
|
}
|
|
else
|
|
{
|
|
remove_object_from_state(op_data->oid, op_data->object_state, pg);
|
|
}
|
|
pg.total_count--;
|
|
object_id oid = op_data->oid;
|
|
finish_op(cur_op, cur_op->req.rw.len);
|
|
// Continue other write operations to the same object
|
|
auto next_it = pg.write_queue.find(oid);
|
|
auto this_it = next_it;
|
|
if (this_it != pg.write_queue.end() && this_it->second == cur_op)
|
|
{
|
|
next_it++;
|
|
pg.write_queue.erase(this_it);
|
|
if (next_it != pg.write_queue.end() &&
|
|
next_it->first == oid)
|
|
{
|
|
osd_op_t *next_op = next_it->second;
|
|
continue_primary_write(next_op);
|
|
}
|
|
}
|
|
}
|