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Implement basic primary-sync-stabilize

blocking-uring-test
Vitaliy Filippov 2020-02-25 20:10:17 +03:00
parent 74673c761f
commit a406c62a71
5 changed files with 305 additions and 23 deletions
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89
blockstore.h
View File

@ -35,17 +35,88 @@
#define BS_OP_PRIVATE_DATA_SIZE 256
/* BS_OP_LIST:
/*
Blockstore opcode documentation:
## BS_OP_READ / BS_OP_WRITE
Read or write object data.
Input:
- oid.stripe = parity block size
- oid = requested object
- version = requested version.
For reads:
- version == 0: read the last stable version,
- version == UINT64_MAX: read the last version,
- otherwise: read the newest version that is <= the specified version
For writes:
- if version == 0, a new version is assigned automatically
- if version != 0, it is assigned for the new write if possible, otherwise -EINVAL is returned
- offset, len = offset and length within object. length may be zero, in that case
read operation only returns the version / write operation only bumps the version
- buf = pre-allocated buffer for data (read) / with data (write). may be NULL if len == 0.
Output:
- retval = number of bytes actually read/written or negative error number (-EINVAL or -ENOSPC)
- version = the version actually read or written
## BS_OP_DELETE
Delete an object.
Input:
- oid = requested object
- version = requested version. Treated the same as with BS_OP_WRITE
Output:
- retval = 0 or negative error number (-EINVAL)
- version = the version actually written (delete is initially written as an object version)
## BS_OP_SYNC
Make sure all previously issued modifications reach physical media.
Input: Nothing except opcode
Output:
- retval = 0 or negative error number (-EINVAL)
## BS_OP_STABLE / BS_OP_ROLLBACK
Mark objects as stable / rollback previous unstable writes.
Input:
- len = count of obj_ver_id's to stabilize or rollback
- stabilize: all object versions up to the requested version of each object are marked as stable
- rollback: all objects are rolled back to the requested stable versions
- buf = pre-allocated obj_ver_id array <len> units long
Output:
- retval = 0 or negative error number (-EINVAL)
## BS_OP_SYNC_STAB_ALL
ONLY FOR TESTS! Sync and mark all unstable object versions as stable, at once.
Input: Nothing except opcode
Output:
- retval = 0 or negative error number (-EINVAL)
## BS_OP_LIST
Get a list of all objects in this Blockstore.
Input:
- oid.stripe = PG alignment
- len = PG count or 0 to list all objects
- offset = PG number
Output:
- retval = total obj_ver_id count
- version = stable obj_ver_id count
- buf = obj_ver_id array allocated by the blockstore. stable versions come first
- buf = obj_ver_id array allocated by the blockstore. Stable versions come first.
You must free it yourself after usage with free().
Output includes all objects for which (((inode + stripe / <PG alignment>) % <PG count>) == <PG number>).
*/
@ -55,21 +126,9 @@ struct blockstore_op_t
uint64_t opcode;
// finish callback
std::function<void (blockstore_op_t*)> callback;
// For reads, writes & deletes: oid is the requested object
object_id oid;
// For reads:
// version == 0 -> read the last stable version,
// version == UINT64_MAX -> read the last version,
// otherwise -> read the newest version that is <= the specified version
// after execution, version is equal to the version that was read from the blockstore
// For writes & deletes:
// if version == 0, a new version is assigned automatically
// if version != 0, it is assigned for the new write if possible, otherwise -EINVAL is returned
// after execution, version is equal to the version that was written to the blockstore
uint64_t version;
// For reads & writes: offset & len are the requested part of the object, buf is the buffer
uint32_t offset;
// For stabilize requests: buf contains <len> obj_ver_id's to stabilize
uint32_t len;
void *buf;
int retval;

4
osd.cpp
View File

@ -340,6 +340,10 @@ void osd_t::exec_op(osd_op_t *cur_op)
{
continue_primary_write(cur_op);
}
else if (cur_op->req.hdr.opcode == OSD_OP_SYNC)
{
continue_primary_sync(cur_op);
}
else
{
exec_secondary(cur_op);

25
osd.h
View File

@ -159,6 +159,12 @@ struct osd_client_t
struct osd_rmw_stripe_t;
struct osd_object_id_t
{
osd_num_t osd_num;
object_id oid;
};
class osd_t
{
// config
@ -181,7 +187,8 @@ class osd_t
uint64_t next_subop_id = 1;
// Unstable writes
spp::sparse_hash_map<osd_num_t, spp::sparse_hash_map<object_id, uint64_t>> unstable_writes;
std::map<osd_object_id_t, uint64_t> unstable_writes;
std::deque<osd_op_t*> syncs_in_progress;
// client & peer I/O
@ -240,12 +247,26 @@ class osd_t
bool prepare_primary_rw(osd_op_t *cur_op);
void continue_primary_read(osd_op_t *cur_op);
void continue_primary_write(osd_op_t *cur_op);
void exec_primary_sync(osd_op_t *cur_op);
void continue_primary_sync(osd_op_t *cur_op);
void finish_primary_op(osd_op_t *cur_op, int retval);
void handle_primary_subop(osd_op_t *cur_op, int ok, uint64_t version);
void submit_primary_subops(int submit_type, int read_pg_size, const uint64_t* osd_set, osd_op_t *cur_op);
void submit_primary_sync_subops(osd_op_t *cur_op);
void submit_primary_stab_subops(osd_op_t *cur_op);
public:
osd_t(blockstore_config_t & config, blockstore_t *bs, ring_loop_t *ringloop);
~osd_t();
bool shutdown();
};
inline bool operator == (const osd_object_id_t & a, const osd_object_id_t & b)
{
return a.osd_num == b.osd_num && a.oid.inode == b.oid.inode && a.oid.stripe == b.oid.stripe;
}
inline bool operator < (const osd_object_id_t & a, const osd_object_id_t & b)
{
return a.osd_num < b.osd_num || a.osd_num == b.osd_num && (
a.oid.inode < b.oid.inode || a.oid.inode == b.oid.inode && a.oid.stripe < b.oid.stripe
);
}

2
osd_ops.h
View File

@ -103,7 +103,7 @@ struct __attribute__((__packed__)) osd_op_secondary_stabilize_t
{
osd_op_header_t header;
// obj_ver_id array length in bytes
uint32_t len;
uint64_t len;
};
typedef osd_op_secondary_stabilize_t osd_op_secondary_rollback_t;

208
osd_primary.cpp
View File

@ -14,6 +14,12 @@
//
// sync: sync peers, get unstable versions from somewhere, stabilize them
struct unstable_osd_num_t
{
osd_num_t osd_num;
int start, len;
};
struct osd_primary_op_data_t
{
int st = 0;
@ -25,6 +31,9 @@ struct osd_primary_op_data_t
int degraded = 0, pg_size, pg_minsize;
osd_rmw_stripe_t *stripes;
osd_op_t *subops = NULL;
// for sync. oops, requires freeing
std::vector<unstable_osd_num_t> *unstable_write_osds = NULL;
obj_ver_id *unstable_writes = NULL;
};
void osd_t::finish_primary_op(osd_op_t *cur_op, int retval)
@ -350,9 +359,12 @@ resume_5:
{
if (osd_set[role] != 0)
{
this->unstable_writes[osd_set[role]][(object_id){
.inode = op_data->oid.inode,
.stripe = op_data->oid.stripe | role,
this->unstable_writes[(osd_object_id_t){
.osd_num = osd_set[role],
.oid = {
.inode = op_data->oid.inode,
.stripe = op_data->oid.stripe | role,
},
}] = op_data->fact_ver;
}
}
@ -374,7 +386,193 @@ resume_5:
}
}
void osd_t::exec_primary_sync(osd_op_t *cur_op)
// Save and clear unstable_writes -> SYNC all -> STABLE all
// FIXME: Run regular automatic syncs based on the number of unstable writes and/or system time
void osd_t::continue_primary_sync(osd_op_t *cur_op)
{
if (!cur_op->op_data)
{
cur_op->op_data = (osd_primary_op_data_t*)calloc(sizeof(osd_primary_op_data_t), 1);
}
if (cur_op->op_data->st == 1) goto resume_1;
else if (cur_op->op_data->st == 2) goto resume_2;
else if (cur_op->op_data->st == 3) goto resume_3;
else if (cur_op->op_data->st == 4) goto resume_4;
else if (cur_op->op_data->st == 5) goto resume_5;
else if (cur_op->op_data->st == 6) goto resume_6;
if (syncs_in_progress.size() > 0)
{
// Wait for previous syncs, if any
// FIXME: We may try to execute the current one in parallel, like in Blockstore, but I'm not sure if it matters at all
syncs_in_progress.push_back(cur_op);
cur_op->op_data->st = 1;
resume_1:
return;
}
else
{
syncs_in_progress.push_back(cur_op);
}
resume_2:
// FIXME: Handle operation cancel
if (unstable_writes.size() == 0)
{
// Nothing to sync
goto finish;
}
// Save and clear unstable_writes
// FIXME: This is possible to do it on a per-client basis
// It would be cool not to copy them here at all, but someone has to deduplicate them by object IDs anyway
cur_op->op_data->unstable_write_osds = new std::vector<unstable_osd_num_t>();
cur_op->op_data->unstable_writes = new obj_ver_id[unstable_writes.size()];
{
osd_num_t last_osd = 0;
int last_start = 0, last_end = 0;
for (auto it = unstable_writes.begin(); it != unstable_writes.end(); it++)
{
if (last_osd != it->first.osd_num)
{
if (last_osd != 0)
{
cur_op->op_data->unstable_write_osds->push_back((unstable_osd_num_t){
.osd_num = last_osd,
.start = last_start,
.len = last_end - last_start,
});
}
last_osd = it->first.osd_num;
last_start = last_end;
}
cur_op->op_data->unstable_writes[last_end] = (obj_ver_id){
.oid = it->first.oid,
.version = it->second,
};
last_start++;
last_end++;
}
if (last_osd != 0)
{
cur_op->op_data->unstable_write_osds->push_back((unstable_osd_num_t){
.osd_num = last_osd,
.start = last_start,
.len = last_end - last_start,
});
}
}
unstable_writes.clear();
// SYNC
submit_primary_sync_subops(cur_op);
resume_3:
cur_op->op_data->st = 3;
return;
resume_4:
// Stabilize version sets
submit_primary_stab_subops(cur_op);
resume_5:
cur_op->op_data->st = 5;
return;
resume_6:
// FIXME: Free them correctly (via a destructor or so)
delete cur_op->op_data->unstable_write_osds;
delete cur_op->op_data->unstable_writes;
cur_op->op_data->unstable_writes = NULL;
cur_op->op_data->unstable_write_osds = NULL;
finish:
assert(syncs_in_progress.front() == cur_op);
syncs_in_progress.pop_front();
finish_primary_op(cur_op, 0);
if (syncs_in_progress.size() > 0)
{
osd_op_t *next_op = syncs_in_progress.front();
next_op->op_data->st++;
continue_primary_sync(next_op);
}
}
void osd_t::submit_primary_sync_subops(osd_op_t *cur_op)
{
osd_primary_op_data_t *op_data = cur_op->op_data;
int n_osds = op_data->unstable_write_osds->size();
osd_op_t *subops = new osd_op_t[n_osds];
op_data->done = op_data->errors = 0;
op_data->n_subops = n_osds;
op_data->subops = subops;
for (int i = 0; i < n_osds; i++)
{
osd_num_t sync_osd = (*(op_data->unstable_write_osds))[i].osd_num;
if (sync_osd == this->osd_num)
{
subops[i].bs_op = new blockstore_op_t({
.opcode = BS_OP_SYNC,
.callback = [cur_op, this](blockstore_op_t *subop)
{
handle_primary_subop(cur_op, subop->retval == 0, 0);
},
});
bs->enqueue_op(subops[i].bs_op);
}
else
{
subops[i].op_type = OSD_OP_OUT;
subops[i].peer_fd = osd_peer_fds.at(sync_osd);
subops[i].req.sec_sync = {
.header = {
.magic = SECONDARY_OSD_OP_MAGIC,
.id = this->next_subop_id++,
.opcode = OSD_OP_SECONDARY_SYNC,
},
};
subops[i].callback = [cur_op, this](osd_op_t *subop)
{
handle_primary_subop(cur_op, subop->reply.hdr.retval == 0, 0);
};
outbox_push(clients[subops[i].peer_fd], &subops[i]);
}
}
}
void osd_t::submit_primary_stab_subops(osd_op_t *cur_op)
{
osd_primary_op_data_t *op_data = cur_op->op_data;
int n_osds = op_data->unstable_write_osds->size();
osd_op_t *subops = new osd_op_t[n_osds];
op_data->done = op_data->errors = 0;
op_data->n_subops = n_osds;
op_data->subops = subops;
for (int i = 0; i < n_osds; i++)
{
auto & stab_osd = (*(op_data->unstable_write_osds))[i];
if (stab_osd.osd_num == this->osd_num)
{
subops[i].bs_op = new blockstore_op_t({
.opcode = BS_OP_STABLE,
.callback = [cur_op, this](blockstore_op_t *subop)
{
handle_primary_subop(cur_op, subop->retval == 0, 0);
},
.len = (uint32_t)stab_osd.len,
.buf = (void*)(op_data->unstable_writes + stab_osd.start),
});
bs->enqueue_op(subops[i].bs_op);
}
else
{
subops[i].op_type = OSD_OP_OUT;
subops[i].peer_fd = osd_peer_fds.at(stab_osd.osd_num);
subops[i].req.sec_stab = {
.header = {
.magic = SECONDARY_OSD_OP_MAGIC,
.id = this->next_subop_id++,
.opcode = OSD_OP_SECONDARY_STABILIZE,
},
.len = (uint64_t)(stab_osd.len * sizeof(obj_ver_id)),
};
subops[i].send_list.push_back(op_data->unstable_writes + stab_osd.start, stab_osd.len * sizeof(obj_ver_id));
subops[i].callback = [cur_op, this](osd_op_t *subop)
{
handle_primary_subop(cur_op, subop->reply.hdr.retval == 0, 0);
};
outbox_push(clients[subops[i].peer_fd], &subops[i]);
}
}
}