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object.c
502 lines (407 loc) · 13.3 KB
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object.c
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#include <assert.h>
#include <pthread.h>
#include <gc/gc.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "types.h"
#include "9p.h"
#include "list.h"
#include "transaction.h"
#include "util.h"
#include "config.h"
#include "object.h"
#include "dispatch.h"
#include "worker.h"
#include "lru.h"
#include "disk.h"
/* Operations on storage objects.
* These functions allow simple calls to the object storage service. They
* handle local caching, find storage servers based on OID, and handle
* replication. */
/* pool of reserved oids */
static u64 object_reserve_next;
static u32 object_reserve_remaining;
static pthread_cond_t *object_reserve_wait;
static Lru *object_cache_status;
void object_cache_validate(u64 oid) {
u64 *key;
if (objectroot == NULL)
return;
key = GC_NEW_ATOMIC(u64);
assert(key != NULL);
*key = oid;
lru_add(object_cache_status, key, key);
}
void object_cache_invalidate(u64 oid) {
if (objectroot == NULL)
return;
lru_remove(object_cache_status, &oid);
}
void object_cache_invalidate_all(void) {
if (objectroot == NULL)
return;
lru_clear(object_cache_status);
}
int object_cache_isvalid(u64 oid) {
return objectroot != NULL && lru_get(object_cache_status, &oid) != NULL;
}
static void send_request_to_all(Transaction *trans,
void (*callback)(void *), void *env)
{
List *requests = cons(trans, NULL);
int i;
for (i = 1; i < storage_server_count; i++) {
Transaction *newtrans =
trans_new(storage_servers[i], NULL, message_new());
/* copy the whole mess over */
memcpy(newtrans->out, trans->out, sizeof(Message));
/* for tswrite, we need to copy the data payload as well */
if (newtrans->out->raw != NULL) {
struct Tswrite *req = &newtrans->out->msg.tswrite;
assert(trans->out->id == TSWRITE);
newtrans->out->raw = raw_new();
req->data = newtrans->out->raw + TWRITE_DATA_OFFSET;
memcpy(req->data, trans->out->raw + TWRITE_DATA_OFFSET, req->count);
}
requests = cons(newtrans, requests);
}
/* send request to all storage servers and wait for all to respond */
send_requests(requests, callback, env);
/* make sure they all succeeded */
while (!null(requests)) {
trans = car(requests);
assert(trans->in != NULL && trans->in->id == trans->out->id + 1);
requests = cdr(requests);
}
}
u64 object_reserve_oid(Worker *worker) {
assert(storage_server_count > 0);
/* is someone else in the process of requesting new oids? */
while (object_reserve_wait != NULL)
cond_wait(object_reserve_wait);
/* do we need to request a fresh batch of oids? */
if (object_reserve_remaining == 0) {
/* the first storage server is considered the master */
Transaction *trans = trans_new(storage_servers[0], NULL, message_new());
struct Rsreserve *res;
pthread_cond_t *wait;
trans->out->tag = ALLOCTAG;
trans->out->id = TSRESERVE;
wait = object_reserve_wait = cond_new();
send_request(trans);
object_reserve_wait = NULL;
cond_broadcast(wait);
res = &trans->in->msg.rsreserve;
object_reserve_next = res->firstoid;
object_reserve_remaining = res->count;
}
object_reserve_remaining--;
return object_reserve_next++;
}
struct qid object_create(Worker *worker, u64 oid, u32 mode,
u32 ctime, char *uid, char *gid, char *extension)
{
Transaction *trans = trans_new(storage_servers[0], NULL, message_new());
struct Rscreate *res;
int len;
/* create it in the cache */
if (objectroot != NULL) {
len = disk_create(worker, oid, mode, ctime, uid, gid, extension);
assert(len >= 0);
object_cache_validate(oid);
}
/* create it on the storage servers */
trans->out->tag = ALLOCTAG;
trans->out->id = TSCREATE;
set_tscreate(trans->out, oid, mode, ctime, uid, gid, extension);
send_request_to_all(trans, NULL, NULL);
res = &trans->in->msg.rscreate;
return res->qid;
}
struct object_clone_env {
Worker *worker;
u64 oid;
u64 newoid;
};
static void object_clone_cb(struct object_clone_env *env) {
/* clone it locally if we have it in the cache */
if (object_cache_isvalid(env->oid)) {
int res = disk_clone(env->worker, env->oid, env->newoid);
assert(res >= 0);
object_cache_validate(env->newoid);
}
}
void object_clone(Worker *worker, u64 oid, u64 newoid) {
struct object_clone_env env = {
.worker = worker,
.oid = oid,
.newoid = newoid
};
Transaction *trans = trans_new(storage_servers[0], NULL, message_new());
trans->out->tag = ALLOCTAG;
trans->out->id = TSCLONE;
set_tsclone(trans->out, oid, newoid);
send_request_to_all(trans, (void (*)(void *)) object_clone_cb, &env);
}
void *object_read(Worker *worker, u64 oid, u32 atime, u64 offset, u32 count,
u32 *bytesread, u8 **data)
{
int i;
Transaction *trans;
struct Rsread *res;
void *result;
/* read from the cache if it exists */
if (object_cache_isvalid(oid)) {
u8 *raw = raw_new();
int len;
*data = raw + RSREAD_DATA_OFFSET;
len = disk_read(worker, oid, atime, offset, count, *data);
assert(len > 0);
*bytesread = len;
return raw;
}
i = randInt(storage_server_count);
trans = trans_new(storage_servers[i], NULL, message_new());
trans->out->tag = ALLOCTAG;
trans->out->id = TSREAD;
set_tsread(trans->out, oid, atime, offset, count);
/* send the request to one randomly chosen storage server */
send_request(trans);
assert(trans->in != NULL && trans->in->id == RSREAD);
res = &trans->in->msg.rsread;
*bytesread = res->count;
*data = res->data;
result = trans->in->raw;
trans->in->raw = NULL;
return result;
}
struct object_write_env {
Worker *worker;
u64 oid;
u32 mtime;
u64 offset;
u32 count;
u8 *data;
};
static void object_write_cb(struct object_write_env *env) {
/* write to the cache if it exists */
if (object_cache_isvalid(env->oid)) {
int len = disk_write(env->worker, env->oid, env->mtime,
env->offset, env->count, env->data);
assert(len > 0);
}
}
u32 object_write(Worker *worker, u64 oid, u32 mtime, u64 offset,
u32 count, u8 *data, void *raw)
{
struct object_write_env env = {
.worker = worker,
.oid = oid,
.mtime = mtime,
.offset = offset,
.count = count,
.data = data
};
Transaction *trans = trans_new(storage_servers[0], NULL, message_new());
struct Rswrite *res;
assert(raw != NULL);
trans->out->raw = raw;
trans->out->tag = ALLOCTAG;
trans->out->id = TSWRITE;
set_tswrite(trans->out, mtime, offset, count, data, oid);
send_request_to_all(trans, (void (*)(void *)) object_write_cb, &env);
res = &trans->in->msg.rswrite;
return res->count;
}
struct p9stat *object_stat(Worker *worker, u64 oid, char *filename) {
int i;
Transaction *trans;
struct Rsstat *res;
struct p9stat *info;
/* handle it from the cache if it exists */
if (object_cache_isvalid(oid)) {
info = disk_stat(worker, oid);
info->name = filename;
return info;
}
i = randInt(storage_server_count);
trans = trans_new(storage_servers[i], NULL, message_new());
trans->out->tag = ALLOCTAG;
trans->out->id = TSSTAT;
set_tsstat(trans->out, oid);
/* send the request to one randomly chosen storage server */
send_request(trans);
assert(trans->in != NULL && trans->in->id == RSSTAT);
res = &trans->in->msg.rsstat;
/* insert the filename supplied by the caller */
res->stat->name = filename;
/* check if we have a cache entry with matching stats */
if (objectroot != NULL && (info = disk_stat(worker, oid)) != NULL) {
info->name = filename;
info->atime = res->stat->atime;
/* if it's up-to-date, note it as a valid entry */
if (!p9stat_cmp(info, res->stat))
object_cache_validate(oid);
}
return res->stat;
}
struct object_wstat_env {
Worker *worker;
u64 oid;
struct p9stat *info;
};
static void object_wstat_cb(struct object_wstat_env *env) {
/* update the cache if it exists */
if (object_cache_isvalid(env->oid)) {
int res = disk_wstat(env->worker, env->oid, env->info);
assert(res >= 0);
}
}
void object_wstat(Worker *worker, u64 oid, struct p9stat *info) {
struct object_wstat_env env = {
.worker = worker,
.oid = oid,
.info = info
};
Transaction *trans = trans_new(storage_servers[0], NULL, message_new());
trans->out->tag = ALLOCTAG;
trans->out->id = TSWSTAT;
set_tswstat(trans->out, oid, info);
send_request_to_all(trans, (void (*)(void *)) object_wstat_cb, &env);
}
struct object_delete_env {
Worker *worker;
u64 oid;
};
static void object_delete_cb(struct object_delete_env *env) {
/* delete the cache entry if it exists */
if (objectroot != NULL) {
int res = disk_delete(env->worker, env->oid);
object_cache_invalidate(env->oid);
if (res < 0) {
/* no entry is okay for the cache */
assert(-res == ENOENT);
}
}
}
void object_delete(Worker *worker, u64 oid) {
struct object_delete_env env = {
.worker = worker,
.oid = oid
};
Transaction *trans = trans_new(storage_servers[0], NULL, message_new());
trans->out->tag = ALLOCTAG;
trans->out->id = TSDELETE;
set_tsdelete(trans->out, oid);
send_request_to_all(trans, (void (*)(void *)) object_delete_cb, &env);
}
struct object_fetch_env {
Openfile *file;
pthread_cond_t *wait;
};
static void object_fetch_iter(struct object_fetch_env *env, Transaction *trans)
{
struct Rsread *res;
int x;
assert(trans->in != NULL && trans->in->id == RSREAD);
res = &trans->in->msg.rsread;
while (env->wait != NULL)
cond_wait(env->wait);
env->wait = cond_new();
unlock();
x = lseek(env->file->fd, trans->out->msg.tsread.offset, SEEK_SET);
assert(x >= 0);
x = write(env->file->fd, res->data, res->count);
assert(res->count == (u32) x);
lock();
raw_delete(trans->in->raw);
trans->in->raw = NULL;
cond_broadcast(env->wait);
env->wait = NULL;
}
void object_fetch(Worker *worker, u64 oid, struct p9stat *info) {
int res;
u32 packetsize;
u32 packetcount;
u64 offset;
int i;
int start;
u32 time = now();
List **queues;
struct object_fetch_env env;
if (objectroot == NULL || object_cache_isvalid(oid))
return;
/* delete any existing entry in the cache */
res = disk_delete(worker, oid);
assert(res >= 0 || -res == ENOENT);
/* create the file */
disk_create(worker, oid, info->mode, info->mtime, info->uid,
info->gid, info->extension);
/* empty file? */
if (info->length == 0 || !emptystring(info->extension)) {
int res = disk_wstat(worker, oid, info);
assert(res == 0);
return;
}
/* stripe the reads across the storage servers */
queues = GC_MALLOC(sizeof(List *) * storage_server_count);
assert(queues != NULL);
queues[0] = NULL;
packetsize = (storage_servers[0]->maxSize / BLOCK_SIZE) * BLOCK_SIZE;
for (i = 1; i < storage_server_count; i++) {
int size = (storage_servers[i]->maxSize / BLOCK_SIZE) * BLOCK_SIZE;
packetsize = min(packetsize, size);
queues[i] = NULL;
}
packetcount = (info->length + (packetsize - 1)) / packetsize;
i = 0;
offset = 0;
start = randInt(storage_server_count);
/* create read requests in contiguous chunks for each server */
while (offset < info->length) {
u64 size = info->length - offset;
if (size > packetsize)
size = packetsize;
Transaction *trans = trans_new(
storage_servers[(i + start) % storage_server_count],
NULL, message_new());
trans->out->tag = ALLOCTAG;
trans->out->id = TSREAD;
set_tsread(trans->out, oid, time, offset, (u32) size);
queues[i] = cons(trans, queues[i]);
offset += size;
/* time to switch to next server? */
if (offset * storage_server_count > info->length * (i + 1))
i++;
}
/* put the requests in sequential order */
for (i = 0; i < storage_server_count; i++)
queues[i] = reverse(queues[i]);
env.file = disk_get_openfile(worker, oid);
assert(env.file != NULL);
env.wait = NULL;
if (ftruncate(env.file->fd, info->length) < 0)
assert(0);
send_requests_streamed(queues, storage_server_count,
(void (*)(void *, Transaction *)) object_fetch_iter, &env);
if (disk_wstat(worker, oid, info) != 0)
assert(0);
object_cache_validate(oid);
}
void object_state_init(void) {
object_reserve_next = ~ (u64) 0;
object_reserve_remaining = 0;
object_reserve_wait = NULL;
if (objectroot == NULL) {
object_cache_status = NULL;
} else {
object_cache_status = lru_new(
OBJECT_CACHE_STATE_SIZE,
(Hashfunc) u64_hash,
(Cmpfunc) u64_cmp,
NULL,
NULL);
}
}