* GPL HEADER END
*/
/*
- * Copyright (c) 2013, Intel Corporation.
+ * Copyright (c) 2014, Intel Corporation.
*/
/*
* lustre/osp/osp_trans.c
*
+ *
+ * 1. OSP (Object Storage Proxy) transaction methods
+ *
+ * Implement OSP layer transaction related interfaces for the dt_device API
+ * dt_device_operations.
+ *
+ *
+ * 2. Handle asynchronous idempotent operations
+ *
+ * The OSP uses OUT (Object Unified Target) RPC to talk with other server
+ * (MDT or OST) for kinds of operations, such as create, unlink, insert,
+ * delete, lookup, set_(x)attr, get_(x)attr, and etc. To reduce the number
+ * of RPCs, we allow multiple operations to be packaged together in single
+ * OUT RPC.
+ *
+ * For the asynchronous idempotent operations, such as get_(x)attr, related
+ * RPCs will be inserted into a osp_device based shared asynchronous request
+ * queue - osp_device::opd_async_requests. When the queue is full, all the
+ * requests in the queue will be packaged into a single OUT RPC and given to
+ * the ptlrpcd daemon (for sending), then the queue is purged and other new
+ * requests can be inserted into it.
+ *
+ * When the asynchronous idempotent operation inserts the request into the
+ * shared queue, it will register an interpreter. When the packaged OUT RPC
+ * is replied (or failed to be sent out), all the registered interpreters
+ * will be called one by one to handle each own result.
+ *
+ *
+ * There are three kinds of transactions
+ *
+ * 1. Local transaction, all of updates of the transaction are in the local MDT.
+ * 2. Remote transaction, all of updates of the transaction are in one remote
+ * MDT, which only happens in LFSCK now.
+ * 3. Distribute transaction, updates for the transaction are in mulitple MDTs.
+ *
* Author: Di Wang <di.wang@intel.com>
* Author: Fan, Yong <fan.yong@intel.com>
*/
#include "osp_internal.h"
-struct osp_async_update_args {
+/**
+ * The argument for the interpreter callback of osp request.
+ */
+struct osp_update_args {
struct dt_update_request *oaua_update;
- unsigned int oaua_fc:1;
+ atomic_t *oaua_count;
+ wait_queue_head_t *oaua_waitq;
+ bool oaua_flow_control;
};
-struct osp_async_update_item {
- struct list_head oaui_list;
- struct osp_object *oaui_obj;
- void *oaui_data;
- osp_async_update_interpterer_t oaui_interpterer;
+/**
+ * Call back for each update request.
+ */
+struct osp_update_callback {
+ /* list in the dt_update_request::dur_cb_items */
+ struct list_head ouc_list;
+
+ /* The target of the async update request. */
+ struct osp_object *ouc_obj;
+
+ /* The data used by or_interpreter. */
+ void *ouc_data;
+
+ /* The interpreter function called after the async request handled. */
+ osp_update_interpreter_t ouc_interpreter;
};
-static struct osp_async_update_item *
-osp_async_update_item_init(struct osp_object *obj, void *data,
- osp_async_update_interpterer_t interpterer)
+static struct object_update_request *object_update_request_alloc(size_t size)
+{
+ struct object_update_request *ourq;
+
+ OBD_ALLOC_LARGE(ourq, size);
+ if (ourq == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ ourq->ourq_magic = UPDATE_REQUEST_MAGIC;
+ ourq->ourq_count = 0;
+
+ return ourq;
+}
+
+static void object_update_request_free(struct object_update_request *ourq,
+ size_t ourq_size)
+{
+ if (ourq != NULL)
+ OBD_FREE_LARGE(ourq, ourq_size);
+}
+
+/**
+ * Allocate and initialize dt_update_request
+ *
+ * dt_update_request is being used to track updates being executed on
+ * this dt_device(OSD or OSP). The update buffer will be 4k initially,
+ * and increased if needed.
+ *
+ * \param [in] dt dt device
+ *
+ * \retval dt_update_request being allocated if succeed
+ * \retval ERR_PTR(errno) if failed
+ */
+struct dt_update_request *dt_update_request_create(struct dt_device *dt)
{
- struct osp_async_update_item *oaui;
+ struct dt_update_request *dt_update;
+ struct object_update_request *ourq;
+
+ OBD_ALLOC_PTR(dt_update);
+ if (dt_update == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ ourq = object_update_request_alloc(OUT_UPDATE_INIT_BUFFER_SIZE);
+ if (IS_ERR(ourq)) {
+ OBD_FREE_PTR(dt_update);
+ return ERR_CAST(ourq);
+ }
+
+ dt_update->dur_buf.ub_req = ourq;
+ dt_update->dur_buf.ub_req_size = OUT_UPDATE_INIT_BUFFER_SIZE;
+
+ dt_update->dur_dt = dt;
+ dt_update->dur_batchid = 0;
+ INIT_LIST_HEAD(&dt_update->dur_cb_items);
+
+ return dt_update;
+}
- OBD_ALLOC_PTR(oaui);
- if (oaui == NULL)
+/**
+ * Destroy dt_update_request
+ *
+ * \param [in] dt_update dt_update_request being destroyed
+ */
+void dt_update_request_destroy(struct dt_update_request *dt_update)
+{
+ if (dt_update == NULL)
+ return;
+
+ object_update_request_free(dt_update->dur_buf.ub_req,
+ dt_update->dur_buf.ub_req_size);
+ OBD_FREE_PTR(dt_update);
+}
+
+/**
+ * Allocate an osp request and initialize it with the given parameters.
+ *
+ * \param[in] obj pointer to the operation target
+ * \param[in] data pointer to the data used by the interpreter
+ * \param[in] interpreter pointer to the interpreter function
+ *
+ * \retval pointer to the asychronous request
+ * \retval NULL if the allocation failed
+ */
+static struct osp_update_callback *
+osp_update_callback_init(struct osp_object *obj, void *data,
+ osp_update_interpreter_t interpreter)
+{
+ struct osp_update_callback *ouc;
+
+ OBD_ALLOC_PTR(ouc);
+ if (ouc == NULL)
return NULL;
lu_object_get(osp2lu_obj(obj));
- INIT_LIST_HEAD(&oaui->oaui_list);
- oaui->oaui_obj = obj;
- oaui->oaui_data = data;
- oaui->oaui_interpterer = interpterer;
+ INIT_LIST_HEAD(&ouc->ouc_list);
+ ouc->ouc_obj = obj;
+ ouc->ouc_data = data;
+ ouc->ouc_interpreter = interpreter;
- return oaui;
+ return ouc;
}
-static void osp_async_update_item_fini(const struct lu_env *env,
- struct osp_async_update_item *oaui)
+/**
+ * Destroy the osp_update_callback.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] ouc pointer to osp_update_callback
+ */
+static void osp_update_callback_fini(const struct lu_env *env,
+ struct osp_update_callback *ouc)
{
- LASSERT(list_empty(&oaui->oaui_list));
+ LASSERT(list_empty(&ouc->ouc_list));
- lu_object_put(env, osp2lu_obj(oaui->oaui_obj));
- OBD_FREE_PTR(oaui);
+ lu_object_put(env, osp2lu_obj(ouc->ouc_obj));
+ OBD_FREE_PTR(ouc);
}
-static int osp_async_update_interpret(const struct lu_env *env,
- struct ptlrpc_request *req,
- void *arg, int rc)
+/**
+ * Interpret the packaged OUT RPC results.
+ *
+ * For every packaged sub-request, call its registered interpreter function.
+ * Then destroy the sub-request.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] req pointer to the RPC
+ * \param[in] arg pointer to data used by the interpreter
+ * \param[in] rc the RPC return value
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
+static int osp_update_interpret(const struct lu_env *env,
+ struct ptlrpc_request *req, void *arg, int rc)
{
struct object_update_reply *reply = NULL;
- struct osp_async_update_args *oaua = arg;
+ struct osp_update_args *oaua = arg;
struct dt_update_request *dt_update = oaua->oaua_update;
- struct osp_async_update_item *oaui;
- struct osp_async_update_item *next;
- struct osp_device *osp = dt2osp_dev(dt_update->dur_dt);
+ struct osp_update_callback *ouc;
+ struct osp_update_callback *next;
int count = 0;
int index = 0;
int rc1 = 0;
- if (oaua->oaua_fc)
- up(&osp->opd_async_fc_sem);
+ if (oaua->oaua_flow_control)
+ obd_put_request_slot(
+ &dt2osp_dev(dt_update->dur_dt)->opd_obd->u.cli);
- if (rc == 0 || req->rq_repmsg != NULL) {
+ /* Unpack the results from the reply message. */
+ if (req->rq_repmsg != NULL) {
reply = req_capsule_server_sized_get(&req->rq_pill,
&RMF_OUT_UPDATE_REPLY,
OUT_UPDATE_REPLY_SIZE);
rc1 = rc;
}
- list_for_each_entry_safe(oaui, next, &dt_update->dur_cb_items,
- oaui_list) {
- list_del_init(&oaui->oaui_list);
+ list_for_each_entry_safe(ouc, next, &dt_update->dur_cb_items,
+ ouc_list) {
+ list_del_init(&ouc->ouc_list);
+
+ /* The peer may only have handled some requests (indicated
+ * by the 'count') in the packaged OUT RPC, we can only get
+ * results for the handled part. */
if (index < count && reply->ourp_lens[index] > 0) {
struct object_update_result *result;
rc1 = -EINVAL;
}
- oaui->oaui_interpterer(env, reply, oaui->oaui_obj,
- oaui->oaui_data, index, rc1);
- osp_async_update_item_fini(env, oaui);
+ if (ouc->ouc_interpreter != NULL)
+ ouc->ouc_interpreter(env, reply, req, ouc->ouc_obj,
+ ouc->ouc_data, index, rc1);
+
+ osp_update_callback_fini(env, ouc);
index++;
}
- out_destroy_update_req(dt_update);
+ if (oaua->oaua_count != NULL && atomic_dec_and_test(oaua->oaua_count))
+ wake_up_all(oaua->oaua_waitq);
+
+ dt_update_request_destroy(dt_update);
return 0;
}
-int osp_unplug_async_update(const struct lu_env *env,
- struct osp_device *osp,
- struct dt_update_request *update)
+/**
+ * Pack all the requests in the shared asynchronous idempotent request queue
+ * into a single OUT RPC that will be given to the background ptlrpcd daemon.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] osp pointer to the OSP device
+ * \param[in] update pointer to the shared queue
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
+int osp_unplug_async_request(const struct lu_env *env,
+ struct osp_device *osp,
+ struct dt_update_request *update)
{
- struct osp_async_update_args *args;
- struct ptlrpc_request *req = NULL;
- int rc;
+ struct osp_update_args *args;
+ struct ptlrpc_request *req = NULL;
+ int rc;
- rc = out_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
- update->dur_req, &req);
+ rc = osp_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
+ update->dur_buf.ub_req, &req);
if (rc != 0) {
- struct osp_async_update_item *oaui;
- struct osp_async_update_item *next;
-
- list_for_each_entry_safe(oaui, next,
- &update->dur_cb_items, oaui_list) {
- list_del_init(&oaui->oaui_list);
- oaui->oaui_interpterer(env, NULL, oaui->oaui_obj,
- oaui->oaui_data, 0, rc);
- osp_async_update_item_fini(env, oaui);
+ struct osp_update_callback *ouc;
+ struct osp_update_callback *next;
+
+ list_for_each_entry_safe(ouc, next,
+ &update->dur_cb_items, ouc_list) {
+ list_del_init(&ouc->ouc_list);
+ if (ouc->ouc_interpreter != NULL)
+ ouc->ouc_interpreter(env, NULL, NULL,
+ ouc->ouc_obj,
+ ouc->ouc_data, 0, rc);
+ osp_update_callback_fini(env, ouc);
}
- out_destroy_update_req(update);
+ dt_update_request_destroy(update);
} else {
- LASSERT(list_empty(&update->dur_list));
-
args = ptlrpc_req_async_args(req);
args->oaua_update = update;
- req->rq_interpret_reply = osp_async_update_interpret;
+ args->oaua_count = NULL;
+ args->oaua_waitq = NULL;
+ args->oaua_flow_control = false;
+ req->rq_interpret_reply = osp_update_interpret;
ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
}
return rc;
}
-/* with osp::opd_async_requests_mutex held */
-struct dt_update_request *
+/**
+ * Find or create (if NOT exist or purged) the shared asynchronous idempotent
+ * request queue - osp_device::opd_async_requests.
+ *
+ * If the osp_device::opd_async_requests is not NULL, then return it directly;
+ * otherwise create new dt_update_request and attach it to opd_async_requests.
+ *
+ * \param[in] osp pointer to the OSP device
+ *
+ * \retval pointer to the shared queue
+ * \retval negative error number on failure
+ */
+static struct dt_update_request *
osp_find_or_create_async_update_request(struct osp_device *osp)
{
struct dt_update_request *update = osp->opd_async_requests;
if (update != NULL)
return update;
- update = out_create_update_req(&osp->opd_dt_dev);
+ update = dt_update_request_create(&osp->opd_dt_dev);
if (!IS_ERR(update))
osp->opd_async_requests = update;
return update;
}
-/* with osp::opd_async_requests_mutex held */
-int osp_insert_async_update(const struct lu_env *env,
- struct dt_update_request *update, int op,
- struct osp_object *obj, int count,
- int *lens, const char **bufs, void *data,
- osp_async_update_interpterer_t interpterer)
+/**
+ * Insert an osp_update_callback into the dt_update_request.
+ *
+ * Insert an osp_update_callback to the dt_update_request. Usually each update
+ * in the dt_update_request will have one correspondent callback, and these
+ * callbacks will be called in rq_interpret_reply.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] obj pointer to the operation target object
+ * \param[in] data pointer to the data used by the interpreter
+ * \param[in] interpreter pointer to the interpreter function
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
+int osp_insert_update_callback(const struct lu_env *env,
+ struct dt_update_request *update,
+ struct osp_object *obj, void *data,
+ osp_update_interpreter_t interpreter)
+{
+ struct osp_update_callback *ouc;
+
+ ouc = osp_update_callback_init(obj, data, interpreter);
+ if (ouc == NULL)
+ RETURN(-ENOMEM);
+
+ list_add_tail(&ouc->ouc_list, &update->dur_cb_items);
+
+ return 0;
+}
+
+/**
+ * Insert an asynchronous idempotent request to the shared request queue that
+ * is attached to the osp_device.
+ *
+ * This function generates a new osp_async_request with the given parameters,
+ * then tries to insert the request into the osp_device-based shared request
+ * queue. If the queue is full, then triggers the packaged OUT RPC to purge
+ * the shared queue firstly, and then re-tries.
+ *
+ * NOTE: must hold the osp::opd_async_requests_mutex to serialize concurrent
+ * osp_insert_async_request call from others.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] op operation type, see 'enum update_type'
+ * \param[in] obj pointer to the operation target
+ * \param[in] count array size of the subsequent \a lens and \a bufs
+ * \param[in] lens buffer length array for the subsequent \a bufs
+ * \param[in] bufs the buffers to compose the request
+ * \param[in] data pointer to the data used by the interpreter
+ * \param[in] interpreter pointer to the interpreter function
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
+int osp_insert_async_request(const struct lu_env *env, enum update_type op,
+ struct osp_object *obj, int count,
+ __u16 *lens, const void **bufs, void *data,
+ osp_update_interpreter_t interpreter)
{
- struct osp_async_update_item *oaui;
struct osp_device *osp = lu2osp_dev(osp2lu_obj(obj)->lo_dev);
+ struct dt_update_request *update;
int rc = 0;
ENTRY;
- oaui = osp_async_update_item_init(obj, data, interpterer);
- if (oaui == NULL)
- RETURN(-ENOMEM);
+ update = osp_find_or_create_async_update_request(osp);
+ if (IS_ERR(update))
+ RETURN(PTR_ERR(update));
again:
- rc = out_insert_update(env, update, op, lu_object_fid(osp2lu_obj(obj)),
- count, lens, bufs);
+ /* The queue is full. */
+ rc = out_update_pack(env, &update->dur_buf, op,
+ lu_object_fid(osp2lu_obj(obj)), count, lens, bufs,
+ 0);
if (rc == -E2BIG) {
osp->opd_async_requests = NULL;
mutex_unlock(&osp->opd_async_requests_mutex);
- rc = osp_unplug_async_update(env, osp, update);
+ rc = osp_unplug_async_request(env, osp, update);
mutex_lock(&osp->opd_async_requests_mutex);
if (rc != 0)
- GOTO(out, rc);
+ RETURN(rc);
update = osp_find_or_create_async_update_request(osp);
if (IS_ERR(update))
- GOTO(out, rc = PTR_ERR(update));
+ RETURN(PTR_ERR(update));
goto again;
}
- if (rc == 0)
- list_add_tail(&oaui->oaui_list, &update->dur_cb_items);
+ rc = osp_insert_update_callback(env, update, obj, data, interpreter);
- GOTO(out, rc);
+ RETURN(rc);
+}
-out:
- if (rc != 0)
- osp_async_update_item_fini(env, oaui);
+int osp_trans_update_request_create(struct thandle *th)
+{
+ struct osp_thandle *oth = thandle_to_osp_thandle(th);
+ struct dt_update_request *update;
- return rc;
-}
+ if (oth->ot_dur != NULL)
+ return 0;
+
+ update = dt_update_request_create(th->th_dev);
+ if (IS_ERR(update)) {
+ th->th_result = PTR_ERR(update);
+ return PTR_ERR(update);
+ }
+ oth->ot_dur = update;
+ return 0;
+}
/**
- * If the transaction creation goes to OSP, it means the update
- * in this transaction only includes remote UPDATE. It is only
- * used by LFSCK right now.
- **/
+ * The OSP layer dt_device_operations::dt_trans_create() interface
+ * to create a transaction.
+ *
+ * There are two kinds of transactions that will involve OSP:
+ *
+ * 1) If the transaction only contains the updates on remote server
+ * (MDT or OST), such as re-generating the lost OST-object for
+ * LFSCK, then it is a remote transaction. For remote transaction,
+ * the upper layer caller (such as the LFSCK engine) will call the
+ * dt_trans_create() (with the OSP dt_device as the parameter),
+ * then the call will be directed to the osp_trans_create() that
+ * creates the transaction handler and returns it to the caller.
+ *
+ * 2) If the transcation contains both local and remote updates,
+ * such as cross MDTs create under DNE mode, then the upper layer
+ * caller will not trigger osp_trans_create(). Instead, it will
+ * call dt_trans_create() on other dt_device, such as LOD that
+ * will generate the transaction handler. Such handler will be
+ * used by the whole transaction in subsequent sub-operations.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] d pointer to the OSP dt_device
+ *
+ * \retval pointer to the transaction handler
+ * \retval negative error number on failure
+ */
struct thandle *osp_trans_create(const struct lu_env *env, struct dt_device *d)
{
- struct thandle *th = NULL;
- struct thandle_update *tu = NULL;
- int rc = 0;
+ struct osp_thandle *oth;
+ struct thandle *th = NULL;
+ ENTRY;
- OBD_ALLOC_PTR(th);
- if (unlikely(th == NULL))
- GOTO(out, rc = -ENOMEM);
+ OBD_ALLOC_PTR(oth);
+ if (unlikely(oth == NULL))
+ RETURN(ERR_PTR(-ENOMEM));
+ th = &oth->ot_super;
th->th_dev = d;
th->th_tags = LCT_TX_HANDLE;
- atomic_set(&th->th_refc, 1);
- th->th_alloc_size = sizeof(*th);
- OBD_ALLOC_PTR(tu);
- if (tu == NULL)
- GOTO(out, rc = -ENOMEM);
+ RETURN(th);
+}
- INIT_LIST_HEAD(&tu->tu_remote_update_list);
- tu->tu_only_remote_trans = 1;
- th->th_update = tu;
+/**
+ * Prepare update request.
+ *
+ * Prepare OUT update ptlrpc request, and the request usually includes
+ * all of updates (stored in \param ureq) from one operation.
+ *
+ * \param[in] env execution environment
+ * \param[in] imp import on which ptlrpc request will be sent
+ * \param[in] ureq hold all of updates which will be packed into the req
+ * \param[in] reqp request to be created
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
+int osp_prep_update_req(const struct lu_env *env, struct obd_import *imp,
+ const struct object_update_request *ureq,
+ struct ptlrpc_request **reqp)
+{
+ struct ptlrpc_request *req;
+ struct object_update_request *tmp;
+ int ureq_len;
+ int rc;
+ ENTRY;
-out:
+ req = ptlrpc_request_alloc(imp, &RQF_OUT_UPDATE);
+ if (req == NULL)
+ RETURN(-ENOMEM);
+
+ ureq_len = object_update_request_size(ureq);
+ req_capsule_set_size(&req->rq_pill, &RMF_OUT_UPDATE, RCL_CLIENT,
+ ureq_len);
+
+ rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, OUT_UPDATE);
if (rc != 0) {
- if (tu != NULL)
- OBD_FREE_PTR(tu);
- if (th != NULL)
- OBD_FREE_PTR(th);
- th = ERR_PTR(rc);
+ ptlrpc_req_finished(req);
+ RETURN(rc);
+ }
+
+ req_capsule_set_size(&req->rq_pill, &RMF_OUT_UPDATE_REPLY,
+ RCL_SERVER, OUT_UPDATE_REPLY_SIZE);
+
+ tmp = req_capsule_client_get(&req->rq_pill, &RMF_OUT_UPDATE);
+ memcpy(tmp, ureq, ureq_len);
+
+ ptlrpc_request_set_replen(req);
+ req->rq_request_portal = OUT_PORTAL;
+ req->rq_reply_portal = OSC_REPLY_PORTAL;
+ *reqp = req;
+
+ RETURN(rc);
+}
+
+/**
+ * Send update RPC.
+ *
+ * Send update request to the remote MDT synchronously.
+ *
+ * \param[in] env execution environment
+ * \param[in] imp import on which ptlrpc request will be sent
+ * \param[in] dt_update hold all of updates which will be packed into the req
+ * \param[in] reqp request to be created
+ *
+ * \retval 0 if RPC succeeds.
+ * \retval negative errno if RPC fails.
+ */
+int osp_remote_sync(const struct lu_env *env, struct osp_device *osp,
+ struct dt_update_request *dt_update,
+ struct ptlrpc_request **reqp)
+{
+ struct obd_import *imp = osp->opd_obd->u.cli.cl_import;
+ struct ptlrpc_request *req = NULL;
+ int rc;
+ ENTRY;
+
+ rc = osp_prep_update_req(env, imp, dt_update->dur_buf.ub_req, &req);
+ if (rc != 0)
+ RETURN(rc);
+
+ /* Note: some dt index api might return non-zero result here, like
+ * osd_index_ea_lookup, so we should only check rc < 0 here */
+ rc = ptlrpc_queue_wait(req);
+ if (rc < 0) {
+ ptlrpc_req_finished(req);
+ dt_update->dur_rc = rc;
+ RETURN(rc);
+ }
+
+ if (reqp != NULL) {
+ *reqp = req;
+ RETURN(rc);
}
- return th;
+ dt_update->dur_rc = rc;
+
+ ptlrpc_req_finished(req);
+
+ RETURN(rc);
}
+/**
+ * Trigger the request for remote updates.
+ *
+ * If th_sync is set, then the request will be sent synchronously,
+ * otherwise, the RPC will be sent asynchronously.
+ *
+ * Please refer to osp_trans_create() for transaction type.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] osp pointer to the OSP device
+ * \param[in] dt_update pointer to the dt_update_request
+ * \param[in] th pointer to the transaction handler
+ * \param[out] sent whether the RPC has been sent
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
static int osp_trans_trigger(const struct lu_env *env, struct osp_device *osp,
struct dt_update_request *dt_update,
- struct thandle *th, bool fc)
+ struct thandle *th, int *sent)
{
- struct thandle_update *tu = th->th_update;
- int rc = 0;
-
- LASSERT(tu != NULL);
-
- /* If the transaction only includes remote update, it should
- * still be asynchronous */
- if (is_only_remote_trans(th)) {
- struct osp_async_update_args *args;
- struct ptlrpc_request *req;
-
- list_del_init(&dt_update->dur_list);
- rc = out_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
- dt_update->dur_req, &req);
- if (rc == 0) {
- args = ptlrpc_req_async_args(req);
- args->oaua_update = dt_update;
- args->oaua_fc = !!fc;
- req->rq_interpret_reply =
- osp_async_update_interpret;
- ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
- } else {
- out_destroy_update_req(dt_update);
+ struct osp_update_args *args;
+ struct ptlrpc_request *req;
+ int rc = 0;
+ ENTRY;
+
+ rc = osp_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
+ dt_update->dur_buf.ub_req, &req);
+ if (rc != 0)
+ RETURN(rc);
+
+ *sent = 1;
+ req->rq_interpret_reply = osp_update_interpret;
+ args = ptlrpc_req_async_args(req);
+ args->oaua_update = dt_update;
+ if (is_only_remote_trans(th) && !th->th_sync) {
+ args->oaua_flow_control = true;
+
+ if (!osp->opd_connect_mdt) {
+ down_read(&osp->opd_async_updates_rwsem);
+ args->oaua_count = &osp->opd_async_updates_count;
+ args->oaua_waitq = &osp->opd_syn_barrier_waitq;
+ up_read(&osp->opd_async_updates_rwsem);
+ atomic_inc(args->oaua_count);
}
+
+ ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
} else {
- /* Before we support async update, the cross MDT transaction
- * has to been synchronized */
- th->th_sync = 1;
- rc = out_remote_sync(env, osp->opd_obd->u.cli.cl_import,
- dt_update, NULL);
+ osp_get_rpc_lock(osp);
+ args->oaua_flow_control = false;
+ rc = ptlrpc_queue_wait(req);
+ osp_put_rpc_lock(osp);
+ ptlrpc_req_finished(req);
}
- return rc;
+ RETURN(rc);
}
-int osp_trans_start(const struct lu_env *env, struct dt_device *dt,
- struct thandle *th)
+/**
+ * Get local thandle for osp_thandle
+ *
+ * Get the local OSD thandle from the OSP thandle. Currently, there
+ * are a few OSP API (osp_object_create() and osp_sync_add()) needs
+ * to update the object on local OSD device.
+ *
+ * If the osp_thandle comes from normal stack (MDD->LOD->OSP), then
+ * we will get local thandle by thandle_get_sub_by_dt.
+ *
+ * If the osp_thandle is remote thandle (th_top == NULL, only used
+ * by LFSCK), then it will create a local thandle, and stop it in
+ * osp_trans_stop(). And this only happens on OSP for OST.
+ *
+ * These are temporary solution, once OSP accessing OSD object is
+ * being fixed properly, this function should be removed. XXX
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] th pointer to the transaction handler
+ * \param[in] dt pointer to the OSP device
+ *
+ * \retval pointer to the local thandle
+ * \retval ERR_PTR(errno) if it fails.
+ **/
+struct thandle *osp_get_storage_thandle(const struct lu_env *env,
+ struct thandle *th,
+ struct osp_device *osp)
{
- struct thandle_update *tu = th->th_update;
- struct dt_update_request *dt_update;
- int rc = 0;
+ struct osp_thandle *oth;
+ struct thandle *local_th;
- if (tu == NULL)
- return rc;
+ if (th->th_top != NULL)
+ return thandle_get_sub_by_dt(env, th->th_top,
+ osp->opd_storage);
- /* Check whether there are updates related with this OSP */
- dt_update = out_find_update(tu, dt);
- if (dt_update == NULL)
- return rc;
-
- /* Note: some updates needs to send before local transaction,
- * some needs to send after local transaction.
- *
- * If the transaction only includes remote updates, it will
- * send updates to remote MDT in osp_trans_stop.
- *
- * If it is remote create, it will send the remote req after
- * local transaction. i.e. create the object locally first,
- * then insert the name entry.
- *
- * If it is remote unlink, it will send the remote req before
- * the local transaction, i.e. delete the name entry remote
- * first, then destroy the local object. */
- if (!is_only_remote_trans(th) && !tu->tu_sent_after_local_trans)
- rc = osp_trans_trigger(env, dt2osp_dev(dt), dt_update, th,
- false);
+ LASSERT(!osp->opd_connect_mdt);
+ oth = thandle_to_osp_thandle(th);
+ if (oth->ot_storage_th != NULL)
+ return oth->ot_storage_th;
- return rc;
+ local_th = dt_trans_create(env, osp->opd_storage);
+ if (IS_ERR(local_th))
+ return local_th;
+
+ oth->ot_storage_th = local_th;
+
+ return local_th;
}
+/**
+ * The OSP layer dt_device_operations::dt_trans_start() interface
+ * to start the transaction.
+ *
+ * If the transaction is a remote transaction, then related remote
+ * updates will be triggered in the osp_trans_stop().
+ * Please refer to osp_trans_create() for transaction type.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] dt pointer to the OSP dt_device
+ * \param[in] th pointer to the transaction handler
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
+int osp_trans_start(const struct lu_env *env, struct dt_device *dt,
+ struct thandle *th)
+{
+ struct osp_thandle *oth = thandle_to_osp_thandle(th);
+
+ /* For remote thandle, if there are local thandle, start it here*/
+ if (is_only_remote_trans(th) && oth->ot_storage_th != NULL)
+ return dt_trans_start(env, oth->ot_storage_th->th_dev,
+ oth->ot_storage_th);
+ return 0;
+}
+
+/**
+ * The OSP layer dt_device_operations::dt_trans_stop() interface
+ * to stop the transaction.
+ *
+ * If the transaction is a remote transaction, related remote
+ * updates will be triggered here via osp_trans_trigger().
+ *
+ * For synchronous mode update or any failed update, the request
+ * will be destroyed explicitly when the osp_trans_stop().
+ *
+ * Please refer to osp_trans_create() for transaction type.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] dt pointer to the OSP dt_device
+ * \param[in] th pointer to the transaction handler
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
int osp_trans_stop(const struct lu_env *env, struct dt_device *dt,
struct thandle *th)
{
- struct thandle_update *tu = th->th_update;
- struct dt_update_request *dt_update;
- int rc = 0;
-
- LASSERT(tu != NULL);
- /* Check whether there are updates related with this OSP */
- dt_update = out_find_update(tu, dt);
- if (dt_update == NULL) {
- if (!is_only_remote_trans(th))
- return rc;
- goto put;
+ struct osp_thandle *oth = thandle_to_osp_thandle(th);
+ struct dt_update_request *dt_update;
+ int rc = 0;
+ int sent = 0;
+ ENTRY;
+
+ /* For remote transaction, if there is local storage thandle,
+ * stop it first */
+ if (oth->ot_storage_th != NULL && th->th_top == NULL) {
+ dt_trans_stop(env, oth->ot_storage_th->th_dev,
+ oth->ot_storage_th);
+ oth->ot_storage_th = NULL;
}
- if (dt_update->dur_req->ourq_count == 0) {
- out_destroy_update_req(dt_update);
- goto put;
+ dt_update = oth->ot_dur;
+ if (dt_update == NULL)
+ GOTO(out, rc);
+
+ LASSERT(dt_update != LP_POISON);
+
+ /* If there are no updates, destroy dt_update and thandle */
+ if (dt_update->dur_buf.ub_req == NULL ||
+ dt_update->dur_buf.ub_req->ourq_count == 0) {
+ dt_update_request_destroy(dt_update);
+ GOTO(out, rc);
}
- if (is_only_remote_trans(th)) {
- if (th->th_result == 0) {
- struct osp_device *osp = dt2osp_dev(th->th_dev);
-
- do {
- if (!osp->opd_imp_active ||
- osp->opd_got_disconnected) {
- out_destroy_update_req(dt_update);
- GOTO(put, rc = -ENOTCONN);
- }
-
- /* Get the semaphore to guarantee it has
- * free slot, which will be released via
- * osp_async_update_interpret(). */
- rc = down_timeout(&osp->opd_async_fc_sem, HZ);
- } while (rc != 0);
-
- rc = osp_trans_trigger(env, dt2osp_dev(dt),
- dt_update, th, true);
- if (rc != 0)
- up(&osp->opd_async_fc_sem);
- } else {
- rc = th->th_result;
- out_destroy_update_req(dt_update);
+ if (is_only_remote_trans(th) && !th->th_sync) {
+ struct osp_device *osp = dt2osp_dev(th->th_dev);
+ struct client_obd *cli = &osp->opd_obd->u.cli;
+
+ rc = obd_get_request_slot(cli);
+ if (rc != 0)
+ GOTO(out, rc);
+
+ if (!osp->opd_imp_active || !osp->opd_imp_connected) {
+ obd_put_request_slot(cli);
+ GOTO(out, rc = -ENOTCONN);
}
+
+ rc = osp_trans_trigger(env, dt2osp_dev(dt),
+ dt_update, th, &sent);
+ if (rc != 0)
+ obd_put_request_slot(cli);
} else {
- if (tu->tu_sent_after_local_trans)
- rc = osp_trans_trigger(env, dt2osp_dev(dt),
- dt_update, th, false);
- rc = dt_update->dur_rc;
- out_destroy_update_req(dt_update);
+ rc = osp_trans_trigger(env, dt2osp_dev(dt), dt_update,
+ th, &sent);
}
-put:
- thandle_put(th);
- return rc;
+out:
+ /* If RPC is triggered successfully, dt_update will be freed in
+ * osp_update_interpreter() */
+ if (rc != 0 && dt_update != NULL && sent == 0) {
+ struct osp_update_callback *ouc;
+ struct osp_update_callback *next;
+
+ list_for_each_entry_safe(ouc, next, &dt_update->dur_cb_items,
+ ouc_list) {
+ list_del_init(&ouc->ouc_list);
+ if (ouc->ouc_interpreter != NULL)
+ ouc->ouc_interpreter(env, NULL, NULL,
+ ouc->ouc_obj,
+ ouc->ouc_data, 0, rc);
+ osp_update_callback_fini(env, ouc);
+ }
+
+ dt_update_request_destroy(dt_update);
+ }
+
+ OBD_FREE_PTR(oth);
+
+ RETURN(rc);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff