* GPL HEADER END
*/
/*
- * Copyright (c) 2013, Intel Corporation.
+ * Copyright (c) 2013, 2014, Intel Corporation.
*/
/*
* lustre/osp/osp_md_object.c
*
- * Lustre MDT Proxy Device
+ * OST/MDT proxy device (OSP) Metadata methods
+ *
+ * This file implements methods for remote MD object, which include
+ * dt_object_operations, dt_index_operations and dt_body_operations.
+ *
+ * If there are multiple MDTs in one filesystem, one operation might
+ * include modifications in several MDTs. In such cases, clients
+ * send the RPC to the master MDT, then the operation is decomposed into
+ * object updates which will be dispatched to OSD or OSP. The local updates
+ * go to local OSD and the remote updates go to OSP. In OSP, these remote
+ * object updates will be packed into an update RPC, sent to the remote MDT
+ * and handled by Object Update Target (OUT).
+ *
+ * In DNE phase I, because of missing complete recovery solution, updates
+ * will be executed in order and synchronously.
+ * 1. The transaction is created.
+ * 2. In transaction declare, it collects and packs remote
+ * updates (in osp_md_declare_xxx()).
+ * 3. In transaction start, it sends these remote updates
+ * to remote MDTs, which will execute these updates synchronously.
+ * 4. In transaction execute phase, the local updates will be executed
+ * synchronously.
*
* Author: Di Wang <di.wang@intel.com>
*/
#include <lustre_log.h>
#include "osp_internal.h"
-static const char dot[] = ".";
-static const char dotdot[] = "..";
+#define OUT_UPDATE_BUFFER_SIZE_ADD 4096
+#define OUT_UPDATE_BUFFER_SIZE_MAX (256 * 4096) /* 1M update size now */
+
+/**
+ * Interpreter call for object creation
+ *
+ * Object creation interpreter, which will be called after creating
+ * the remote object to set flags and status.
+ *
+ * \param[in] env execution environment
+ * \param[in] reply update reply
+ * \param[in] req ptlrpc update request for creating object
+ * \param[in] obj object to be created
+ * \param[in] data data used in this function.
+ * \param[in] index index(position) of create update in the whole
+ * updates
+ * \param[in] rc update result on the remote MDT.
+ *
+ * \retval only return 0 for now
+ */
+static int osp_object_create_interpreter(const struct lu_env *env,
+ struct object_update_reply *reply,
+ struct ptlrpc_request *req,
+ struct osp_object *obj,
+ void *data, int index, int rc)
+{
+ if (rc != 0) {
+ obj->opo_obj.do_lu.lo_header->loh_attr &= ~LOHA_EXISTS;
+ obj->opo_non_exist = 1;
+ }
+
+ /* Invalid the opo cache for the object after the object
+ * is being created, so attr_get will try to get attr
+ * from the remote object. XXX this can be improved when
+ * we have object lock/cache invalidate mechanism in OSP
+ * layer */
+ if (obj->opo_ooa != NULL) {
+ spin_lock(&obj->opo_lock);
+ obj->opo_ooa->ooa_attr.la_valid = 0;
+ spin_unlock(&obj->opo_lock);
+ }
+
+ return 0;
+}
+/**
+ * Implementation of dt_object_operations::do_declare_create
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt remote object to be created
+ * \param[in] attr attribute of the created object
+ * \param[in] hint creation hint
+ * \param[in] dof creation format information
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
int osp_md_declare_object_create(const struct lu_env *env,
struct dt_object *dt,
struct lu_attr *attr,
struct dt_object_format *dof,
struct thandle *th)
{
- struct osp_thread_info *osi = osp_env_info(env);
- struct dt_update_request *update;
- struct lu_fid *fid1;
- int sizes[2] = {sizeof(struct obdo), 0};
- char *bufs[2] = {NULL, NULL};
- int buf_count;
- int rc;
-
- update = out_find_create_update_loc(th, dt);
- if (IS_ERR(update)) {
- CERROR("%s: Get OSP update buf failed: rc = %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- (int)PTR_ERR(update));
- return PTR_ERR(update);
- }
-
- osi->osi_obdo.o_valid = 0;
- obdo_from_la(&osi->osi_obdo, attr, attr->la_valid);
- lustre_set_wire_obdo(NULL, &osi->osi_obdo, &osi->osi_obdo);
-
- bufs[0] = (char *)&osi->osi_obdo;
- buf_count = 1;
- fid1 = (struct lu_fid *)lu_object_fid(&dt->do_lu);
- if (hint != NULL && hint->dah_parent) {
- struct lu_fid *fid2;
-
- fid2 = (struct lu_fid *)lu_object_fid(&hint->dah_parent->do_lu);
- sizes[1] = sizeof(*fid2);
- bufs[1] = (char *)fid2;
- buf_count++;
- }
+ struct osp_object *obj = dt2osp_obj(dt);
+ int rc;
- if (lu_object_exists(&dt->do_lu)) {
- /* If the object already exists, we needs to destroy
- * this orphan object first.
- *
- * The scenario might happen in this case
- *
- * 1. client send remote create to MDT0.
- * 2. MDT0 send create update to MDT1.
- * 3. MDT1 finished create synchronously.
- * 4. MDT0 failed and reboot.
- * 5. client resend remote create to MDT0.
- * 6. MDT0 tries to resend create update to MDT1,
- * but find the object already exists
- */
- CDEBUG(D_HA, "%s: object "DFID" exists, destroy this orphan\n",
- dt->do_lu.lo_dev->ld_obd->obd_name, PFID(fid1));
-
- rc = out_insert_update(env, update, OUT_REF_DEL, fid1, 0,
- NULL, NULL);
+ if (obj->opo_ooa == NULL) {
+ rc = osp_oac_init(obj);
if (rc != 0)
- GOTO(out, rc);
+ return rc;
+ }
- if (S_ISDIR(lu_object_attr(&dt->do_lu))) {
- /* decrease for ".." */
- rc = out_insert_update(env, update, OUT_REF_DEL, fid1,
- 0, NULL, NULL);
- if (rc != 0)
- GOTO(out, rc);
- }
+ return osp_trans_update_request_create(th);
+}
- rc = out_insert_update(env, update, OUT_DESTROY, fid1, 0, NULL,
- NULL);
- if (rc != 0)
- GOTO(out, rc);
+struct object_update *
+update_buffer_get_update(struct object_update_request *request,
+ unsigned int index)
+{
+ void *ptr;
+ int i;
- dt->do_lu.lo_header->loh_attr &= ~LOHA_EXISTS;
- /* Increase batchid to add this orphan object deletion
- * to separate transaction */
- update_inc_batchid(update);
- }
+ if (index > request->ourq_count)
+ return NULL;
- rc = out_insert_update(env, update, OUT_CREATE, fid1, buf_count, sizes,
- (const char **)bufs);
-out:
- if (rc)
- CERROR("%s: Insert update error: rc = %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name, rc);
+ ptr = &request->ourq_updates[0];
+ for (i = 0; i < index; i++)
+ ptr += object_update_size(ptr);
- return rc;
+ return ptr;
}
+/**
+ * Implementation of dt_object_operations::do_create
+ *
+ * It adds an OUT_CREATE sub-request into the OUT RPC that will be flushed
+ * when the transaction stop, and sets necessary flags for created object.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be created
+ * \param[in] attr attribute of the created object
+ * \param[in] hint creation hint
+ * \param[in] dof creation format information
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if packing creation succeeds.
+ * \retval negative errno if packing creation fails.
+ */
int osp_md_object_create(const struct lu_env *env, struct dt_object *dt,
struct lu_attr *attr, struct dt_allocation_hint *hint,
struct dt_object_format *dof, struct thandle *th)
{
- struct osp_object *obj = dt2osp_obj(dt);
-
- CDEBUG(D_INFO, "create object "DFID"\n",
- PFID(&dt->do_lu.lo_header->loh_fid));
+ struct osp_update_request *update;
+ struct osp_object *obj = dt2osp_obj(dt);
+ int rc;
- /* Because the create update RPC will be sent during declare phase,
- * if creation reaches here, it means the object has been created
- * successfully */
- dt->do_lu.lo_header->loh_attr |= LOHA_EXISTS | (attr->la_mode & S_IFMT);
- obj->opo_empty = 1;
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
- return 0;
-}
-
-static int osp_md_declare_object_ref_del(const struct lu_env *env,
- struct dt_object *dt,
- struct thandle *th)
-{
- struct dt_update_request *update;
- struct lu_fid *fid;
- int rc;
+ LASSERT(attr->la_valid & LA_TYPE);
+ rc = osp_update_rpc_pack(env, create, update, OUT_CREATE,
+ lu_object_fid(&dt->do_lu), attr, hint, dof);
+ if (rc != 0)
+ GOTO(out, rc);
- update = out_find_create_update_loc(th, dt);
- if (IS_ERR(update)) {
- CERROR("%s: Get OSP update buf failed: rc = %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- (int)PTR_ERR(update));
- return PTR_ERR(update);
- }
+ rc = osp_insert_update_callback(env, update, dt2osp_obj(dt), NULL,
+ osp_object_create_interpreter);
- fid = (struct lu_fid *)lu_object_fid(&dt->do_lu);
+ if (rc < 0)
+ GOTO(out, rc);
- rc = out_insert_update(env, update, OUT_REF_DEL, fid, 0, NULL, NULL);
+ dt->do_lu.lo_header->loh_attr |= LOHA_EXISTS | (attr->la_mode & S_IFMT);
+ dt2osp_obj(dt)->opo_non_exist = 0;
+ LASSERT(obj->opo_ooa != NULL);
+ obj->opo_ooa->ooa_attr = *attr;
+out:
return rc;
}
-static int osp_md_object_ref_del(const struct lu_env *env,
- struct dt_object *dt,
- struct thandle *th)
+/**
+ * Implementation of dt_object_operations::do_declare_ref_del
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to decrease the reference count.
+ * \param[in] th the transaction handle of refcount decrease.
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
+static int osp_md_declare_ref_del(const struct lu_env *env,
+ struct dt_object *dt, struct thandle *th)
{
- CDEBUG(D_INFO, "ref del object "DFID"\n",
- PFID(&dt->do_lu.lo_header->loh_fid));
-
- return 0;
+ return osp_trans_update_request_create(th);
}
-static int osp_md_declare_ref_add(const struct lu_env *env,
- struct dt_object *dt, struct thandle *th)
+/**
+ * Implementation of dt_object_operations::do_ref_del
+ *
+ * Add an OUT_REF_DEL sub-request into the OUT RPC that will be
+ * flushed when the transaction stop.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to decrease the reference count
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if packing ref_del succeeds.
+ * \retval negative errno if packing fails.
+ */
+static int osp_md_ref_del(const struct lu_env *env, struct dt_object *dt,
+ struct thandle *th)
{
- struct dt_update_request *update;
- struct lu_fid *fid;
+ struct osp_update_request *update;
int rc;
- update = out_find_create_update_loc(th, dt);
- if (IS_ERR(update)) {
- CERROR("%s: Get OSP update buf failed: rc = %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- (int)PTR_ERR(update));
- return PTR_ERR(update);
- }
-
- fid = (struct lu_fid *)lu_object_fid(&dt->do_lu);
-
- rc = out_insert_update(env, update, OUT_REF_ADD, fid, 0, NULL, NULL);
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
+ rc = osp_update_rpc_pack(env, ref_del, update, OUT_REF_DEL,
+ lu_object_fid(&dt->do_lu));
return rc;
}
-static int osp_md_object_ref_add(const struct lu_env *env,
- struct dt_object *dt,
- struct thandle *th)
+/**
+ * Implementation of dt_object_operations::do_declare_ref_del
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object on which to increase the reference count.
+ * \param[in] th the transaction handle.
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
+static int osp_md_declare_ref_add(const struct lu_env *env,
+ struct dt_object *dt, struct thandle *th)
{
- CDEBUG(D_INFO, "ref add object "DFID"\n",
- PFID(&dt->do_lu.lo_header->loh_fid));
+ return osp_trans_update_request_create(th);
+}
- return 0;
+/**
+ * Implementation of dt_object_operations::do_ref_add
+ *
+ * Add an OUT_REF_ADD sub-request into the OUT RPC that will be flushed
+ * when the transaction stop.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object on which to increase the reference count
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if packing ref_add succeeds.
+ * \retval negative errno if packing fails.
+ */
+static int osp_md_ref_add(const struct lu_env *env, struct dt_object *dt,
+ struct thandle *th)
+{
+ struct osp_update_request *update;
+ int rc;
+
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
+
+ rc = osp_update_rpc_pack(env, ref_add, update, OUT_REF_ADD,
+ lu_object_fid(&dt->do_lu));
+ return rc;
}
+/**
+ * Implementation of dt_object_operations::do_ah_init
+ *
+ * Initialize the allocation hint for object creation, which is usually called
+ * before the creation, and these hints (parent and child mode) will be sent to
+ * the remote Object Update Target (OUT) and used in the object create process,
+ * same as OSD object creation.
+ *
+ * \param[in] env execution environment
+ * \param[in] ah the hint to be initialized
+ * \param[in] parent the parent of the object
+ * \param[in] child the object to be created
+ * \param[in] child_mode the mode of the created object
+ */
static void osp_md_ah_init(const struct lu_env *env,
struct dt_allocation_hint *ah,
struct dt_object *parent,
ah->dah_mode = child_mode;
}
+/**
+ * Implementation of dt_object_operations::do_declare_attr_get
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object on which to set attributes
+ * \param[in] attr attributes to be set
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
int osp_md_declare_attr_set(const struct lu_env *env, struct dt_object *dt,
const struct lu_attr *attr, struct thandle *th)
{
- struct osp_thread_info *osi = osp_env_info(env);
- struct dt_update_request *update;
- struct lu_fid *fid;
- int size = sizeof(struct obdo);
- char *buf;
- int rc;
-
- update = out_find_create_update_loc(th, dt);
- if (IS_ERR(update)) {
- CERROR("%s: Get OSP update buf failed: %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- (int)PTR_ERR(update));
- return PTR_ERR(update);
- }
-
- osi->osi_obdo.o_valid = 0;
- obdo_from_la(&osi->osi_obdo, (struct lu_attr *)attr,
- attr->la_valid);
- lustre_set_wire_obdo(NULL, &osi->osi_obdo, &osi->osi_obdo);
-
- buf = (char *)&osi->osi_obdo;
- fid = (struct lu_fid *)lu_object_fid(&dt->do_lu);
-
- rc = out_insert_update(env, update, OUT_ATTR_SET, fid, 1, &size,
- (const char **)&buf);
-
- return rc;
+ return osp_trans_update_request_create(th);
}
+/**
+ * Implementation of dt_object_operations::do_attr_set
+ *
+ * Set attributes to the specified remote object.
+ *
+ * Add the OUT_ATTR_SET sub-request into the OUT RPC that will be flushed
+ * when the transaction stop.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to set attributes
+ * \param[in] attr attributes to be set
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if packing attr_set succeeds.
+ * \retval negative errno if packing fails.
+ */
int osp_md_attr_set(const struct lu_env *env, struct dt_object *dt,
- const struct lu_attr *attr, struct thandle *th,
- struct lustre_capa *capa)
+ const struct lu_attr *attr, struct thandle *th)
{
- CDEBUG(D_INFO, "attr set object "DFID"\n",
- PFID(&dt->do_lu.lo_header->loh_fid));
+ struct osp_update_request *update;
+ int rc;
+
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
- RETURN(0);
+ rc = osp_update_rpc_pack(env, attr_set, update, OUT_ATTR_SET,
+ lu_object_fid(&dt->do_lu), attr);
+ return rc;
}
+/**
+ * Implementation of dt_object_operations::do_read_lock
+ *
+ * osp_md_object_{read,write}_lock() will only lock the remote object in the
+ * local cache, which uses the semaphore (opo_sem) inside the osp_object to
+ * lock the object. Note: it will not lock the object in the whole cluster,
+ * which relies on the LDLM lock.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be locked
+ * \param[in] role lock role from MDD layer, see mdd_object_role().
+ */
static void osp_md_object_read_lock(const struct lu_env *env,
struct dt_object *dt, unsigned role)
{
LASSERT(obj->opo_owner == NULL);
}
+/**
+ * Implementation of dt_object_operations::do_write_lock
+ *
+ * Lock the remote object in write mode.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be locked
+ * \param[in] role lock role from MDD layer, see mdd_object_role().
+ */
static void osp_md_object_write_lock(const struct lu_env *env,
struct dt_object *dt, unsigned role)
{
obj->opo_owner = env;
}
+/**
+ * Implementation of dt_object_operations::do_read_unlock
+ *
+ * Unlock the read lock of remote object.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be unlocked
+ */
static void osp_md_object_read_unlock(const struct lu_env *env,
struct dt_object *dt)
{
up_read(&obj->opo_sem);
}
+/**
+ * Implementation of dt_object_operations::do_write_unlock
+ *
+ * Unlock the write lock of remote object.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be unlocked
+ */
static void osp_md_object_write_unlock(const struct lu_env *env,
struct dt_object *dt)
{
up_write(&obj->opo_sem);
}
+/**
+ * Implementation of dt_object_operations::do_write_locked
+ *
+ * Test if the object is locked in write mode.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be tested
+ */
static int osp_md_object_write_locked(const struct lu_env *env,
struct dt_object *dt)
{
return obj->opo_owner == env;
}
+/**
+ * Implementation of dt_index_operations::dio_lookup
+ *
+ * Look up record by key under a remote index object. It packs lookup update
+ * into RPC, sends to the remote OUT and waits for the lookup result.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt index object to lookup
+ * \param[out] rec record in which to return lookup result
+ * \param[in] key key of index which will be looked up
+ *
+ * \retval 1 if the lookup succeeds.
+ * \retval negative errno if the lookup fails.
+ */
static int osp_md_index_lookup(const struct lu_env *env, struct dt_object *dt,
- struct dt_rec *rec, const struct dt_key *key,
- struct lustre_capa *capa)
+ struct dt_rec *rec, const struct dt_key *key)
{
struct lu_buf *lbuf = &osp_env_info(env)->osi_lb2;
struct osp_device *osp = lu2osp_dev(dt->do_lu.lo_dev);
struct dt_device *dt_dev = &osp->opd_dt_dev;
- struct dt_update_request *update;
+ struct osp_update_request *update;
struct object_update_reply *reply;
struct ptlrpc_request *req = NULL;
- int size = strlen((char *)key) + 1;
struct lu_fid *fid;
int rc;
ENTRY;
* just create an update buffer, instead of attaching the
* update_remote list of the thandle.
*/
- update = out_create_update_req(dt_dev);
+ update = osp_update_request_create(dt_dev);
if (IS_ERR(update))
RETURN(PTR_ERR(update));
- rc = out_insert_update(env, update, OUT_INDEX_LOOKUP,
- lu_object_fid(&dt->do_lu),
- 1, &size, (const char **)&key);
- if (rc) {
+ rc = osp_update_rpc_pack(env, index_lookup, update, OUT_INDEX_LOOKUP,
+ lu_object_fid(&dt->do_lu), rec, key);
+ if (rc != 0) {
CERROR("%s: Insert update error: rc = %d\n",
dt_dev->dd_lu_dev.ld_obd->obd_name, rc);
GOTO(out, rc);
}
- rc = out_remote_sync(env, osp->opd_obd->u.cli.cl_import, update, &req);
+ rc = osp_remote_sync(env, osp, update, &req);
if (rc < 0)
GOTO(out, rc);
rc = object_update_result_data_get(reply, lbuf, 0);
if (rc < 0)
- GOTO(out, rc = size);
+ GOTO(out, rc);
if (lbuf->lb_len != sizeof(*fid)) {
CERROR("%s: lookup "DFID" %s wrong size %d\n",
if (req != NULL)
ptlrpc_req_finished(req);
- out_destroy_update_req(update);
+ osp_update_request_destroy(update);
return rc;
}
-static int osp_md_declare_insert(const struct lu_env *env,
- struct dt_object *dt,
- const struct dt_rec *rec,
- const struct dt_key *key,
- struct thandle *th)
+/**
+ * Implementation of dt_index_operations::dio_declare_insert
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object for which to insert index
+ * \param[in] rec record of the index which will be inserted
+ * \param[in] key key of the index which will be inserted
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
+static int osp_md_declare_index_insert(const struct lu_env *env,
+ struct dt_object *dt,
+ const struct dt_rec *rec,
+ const struct dt_key *key,
+ struct thandle *th)
{
- struct dt_update_request *update;
- struct lu_fid *fid;
- struct lu_fid *rec_fid = (struct lu_fid *)rec;
- int size[2] = {strlen((char *)key) + 1,
- sizeof(*rec_fid)};
- const char *bufs[2] = {(char *)key, (char *)rec_fid};
- int rc;
-
- update = out_find_create_update_loc(th, dt);
- if (IS_ERR(update)) {
- CERROR("%s: Get OSP update buf failed: rc = %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- (int)PTR_ERR(update));
- return PTR_ERR(update);
- }
-
- fid = (struct lu_fid *)lu_object_fid(&dt->do_lu);
-
- CDEBUG(D_INFO, "%s: insert index of "DFID" %s: "DFID"\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- PFID(fid), (char *)key, PFID(rec_fid));
-
- fid_cpu_to_le(rec_fid, rec_fid);
-
- rc = out_insert_update(env, update, OUT_INDEX_INSERT, fid,
- ARRAY_SIZE(size), size, bufs);
- return rc;
+ return osp_trans_update_request_create(th);
}
+/**
+ * Implementation of dt_index_operations::dio_insert
+ *
+ * Add an OUT_INDEX_INSERT sub-request into the OUT RPC that will
+ * be flushed when the transaction stop.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object for which to insert index
+ * \param[in] rec record of the index to be inserted
+ * \param[in] key key of the index to be inserted
+ * \param[in] th the transaction handle
+ * \param[in] ignore_quota quota enforcement for insert
+ *
+ * \retval 0 if packing index insert succeeds.
+ * \retval negative errno if packing fails.
+ */
static int osp_md_index_insert(const struct lu_env *env,
struct dt_object *dt,
const struct dt_rec *rec,
const struct dt_key *key,
struct thandle *th,
- struct lustre_capa *capa,
int ignore_quota)
{
- return 0;
-}
-
-static int osp_md_declare_delete(const struct lu_env *env,
- struct dt_object *dt,
- const struct dt_key *key,
- struct thandle *th)
-{
- struct dt_update_request *update;
- struct lu_fid *fid;
- int size = strlen((char *)key) + 1;
- int rc;
-
- update = out_find_create_update_loc(th, dt);
- if (IS_ERR(update)) {
- CERROR("%s: Get OSP update buf failed: rc = %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- (int)PTR_ERR(update));
- return PTR_ERR(update);
- }
-
- fid = (struct lu_fid *)lu_object_fid(&dt->do_lu);
+ struct osp_update_request *update;
+ int rc;
- rc = out_insert_update(env, update, OUT_INDEX_DELETE, fid, 1, &size,
- (const char **)&key);
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
+ rc = osp_update_rpc_pack(env, index_insert, update, OUT_INDEX_INSERT,
+ lu_object_fid(&dt->do_lu), rec, key);
return rc;
}
-static int osp_md_index_delete(const struct lu_env *env,
- struct dt_object *dt,
- const struct dt_key *key,
- struct thandle *th,
- struct lustre_capa *capa)
+/**
+ * Implementation of dt_index_operations::dio_declare_delete
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object for which to delete index
+ * \param[in] key key of the index
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
+static int osp_md_declare_index_delete(const struct lu_env *env,
+ struct dt_object *dt,
+ const struct dt_key *key,
+ struct thandle *th)
{
- CDEBUG(D_INFO, "index delete "DFID" %s\n",
- PFID(&dt->do_lu.lo_header->loh_fid), (char *)key);
-
- return 0;
+ return osp_trans_update_request_create(th);
}
/**
- * Creates or initializes iterator context.
+ * Implementation of dt_index_operations::dio_delete
+ *
+ * Add an OUT_INDEX_DELETE sub-request into the OUT RPC that will
+ * be flushed when the transaction stop.
*
- * Note: for OSP, these index iterate api is only used to check
- * whether the directory is empty now (see mdd_dir_is_empty).
- * Since dir_empty will be return by OUT_ATTR_GET(see osp_attr_get/
- * out_attr_get). So the implementation of these iterator is simplied
- * to make mdd_dir_is_empty happy. The real iterator should be
- * implemented, if we need it one day.
+ * \param[in] env execution environment
+ * \param[in] dt object for which to delete index
+ * \param[in] key key of the index which will be deleted
+ * \param[in] th the transaction handle
+ *
+ * \retval 0 if packing index delete succeeds.
+ * \retval negative errno if packing fails.
*/
-static struct dt_it *osp_it_init(const struct lu_env *env,
- struct dt_object *dt,
- __u32 attr,
- struct lustre_capa *capa)
+static int osp_md_index_delete(const struct lu_env *env,
+ struct dt_object *dt,
+ const struct dt_key *key,
+ struct thandle *th)
{
- lu_object_get(&dt->do_lu);
- return (struct dt_it *)dt;
-}
+ struct osp_update_request *update;
+ int rc;
-static void osp_it_fini(const struct lu_env *env, struct dt_it *di)
-{
- struct dt_object *dt = (struct dt_object *)di;
- lu_object_put(env, &dt->do_lu);
-}
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
-static int osp_it_get(const struct lu_env *env,
- struct dt_it *di, const struct dt_key *key)
-{
- return 1;
-}
+ rc = osp_update_rpc_pack(env, index_delete, update, OUT_INDEX_DELETE,
+ lu_object_fid(&dt->do_lu), key);
-static void osp_it_put(const struct lu_env *env, struct dt_it *di)
-{
- return;
+ return rc;
}
-static int osp_it_next(const struct lu_env *env, struct dt_it *di)
+/**
+ * Implementation of dt_index_operations::dio_it.next
+ *
+ * Advance the pointer of the iterator to the next entry. It shares a similar
+ * internal implementation with osp_orphan_it_next(), which is being used for
+ * remote orphan index object. This method will be used for remote directory.
+ *
+ * \param[in] env execution environment
+ * \param[in] di iterator of this iteration
+ *
+ * \retval 0 if the pointer is advanced successfully.
+ * \retval 1 if it reaches to the end of the index object.
+ * \retval negative errno if the pointer cannot be advanced.
+ */
+static int osp_md_index_it_next(const struct lu_env *env, struct dt_it *di)
{
- struct dt_object *dt = (struct dt_object *)di;
- struct osp_object *o = dt2osp_obj(dt);
+ struct osp_it *it = (struct osp_it *)di;
+ struct lu_idxpage *idxpage;
+ struct lu_dirent *ent = (struct lu_dirent *)it->ooi_ent;
+ int rc;
+ ENTRY;
- if (o->opo_empty)
- return 1;
+again:
+ idxpage = it->ooi_cur_idxpage;
+ if (idxpage != NULL) {
+ if (idxpage->lip_nr == 0)
+ RETURN(1);
+
+ it->ooi_pos_ent++;
+ if (ent == NULL) {
+ it->ooi_ent =
+ (struct lu_dirent *)idxpage->lip_entries;
+ RETURN(0);
+ } else if (le16_to_cpu(ent->lde_reclen) != 0 &&
+ it->ooi_pos_ent < idxpage->lip_nr) {
+ ent = (struct lu_dirent *)(((char *)ent) +
+ le16_to_cpu(ent->lde_reclen));
+ it->ooi_ent = ent;
+ RETURN(0);
+ } else {
+ it->ooi_ent = NULL;
+ }
+ }
- return 0;
+ rc = osp_it_next_page(env, di);
+ if (rc == 0)
+ goto again;
+
+ RETURN(rc);
}
+/**
+ * Implementation of dt_index_operations::dio_it.key
+ *
+ * Get the key at current iterator poisiton. These iteration methods
+ * (dio_it) will only be used for iterating the remote directory, so
+ * the key is the name of the directory entry.
+ *
+ * \param[in] env execution environment
+ * \param[in] di iterator of this iteration
+ *
+ * \retval name of the current entry
+ */
static struct dt_key *osp_it_key(const struct lu_env *env,
const struct dt_it *di)
{
- LBUG();
- return NULL;
+ struct osp_it *it = (struct osp_it *)di;
+ struct lu_dirent *ent = (struct lu_dirent *)it->ooi_ent;
+
+ return (struct dt_key *)ent->lde_name;
}
+/**
+ * Implementation of dt_index_operations::dio_it.key_size
+ *
+ * Get the key size at current iterator poisiton. These iteration methods
+ * (dio_it) will only be used for iterating the remote directory, so the key
+ * size is the name size of the directory entry.
+ *
+ * \param[in] env execution environment
+ * \param[in] di iterator of this iteration
+ *
+ * \retval name size of the current entry
+ */
+
static int osp_it_key_size(const struct lu_env *env, const struct dt_it *di)
{
- LBUG();
- return 0;
-}
+ struct osp_it *it = (struct osp_it *)di;
+ struct lu_dirent *ent = (struct lu_dirent *)it->ooi_ent;
-static int osp_it_rec(const struct lu_env *env, const struct dt_it *di,
- struct dt_rec *lde, __u32 attr)
-{
- LBUG();
- return 0;
+ return (int)le16_to_cpu(ent->lde_namelen);
}
-static __u64 osp_it_store(const struct lu_env *env, const struct dt_it *di)
+/**
+ * Implementation of dt_index_operations::dio_it.rec
+ *
+ * Get the record at current iterator position. These iteration methods
+ * (dio_it) will only be used for iterating the remote directory, so it
+ * uses lu_dirent_calc_size() to calculate the record size.
+ *
+ * \param[in] env execution environment
+ * \param[in] di iterator of this iteration
+ * \param[out] rec the record to be returned
+ * \param[in] attr attributes of the index object, so it knows
+ * how to pack the entry.
+ *
+ * \retval only return 0 for now
+ */
+static int osp_md_index_it_rec(const struct lu_env *env, const struct dt_it *di,
+ struct dt_rec *rec, __u32 attr)
{
- LBUG();
+ struct osp_it *it = (struct osp_it *)di;
+ struct lu_dirent *ent = (struct lu_dirent *)it->ooi_ent;
+ size_t reclen;
+
+ reclen = lu_dirent_calc_size(le16_to_cpu(ent->lde_namelen), attr);
+ memcpy(rec, ent, reclen);
return 0;
}
+/**
+ * Implementation of dt_index_operations::dio_it.load
+ *
+ * Locate the iteration cursor to the specified position (cookie).
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] di pointer to the iteration structure
+ * \param[in] hash the specified position
+ *
+ * \retval positive number for locating to the exactly position
+ * or the next
+ * \retval 0 for arriving at the end of the iteration
+ * \retval negative error number on failure
+ */
static int osp_it_load(const struct lu_env *env, const struct dt_it *di,
__u64 hash)
{
- LBUG();
- return 0;
-}
+ struct osp_it *it = (struct osp_it *)di;
+ int rc;
-static int osp_it_key_rec(const struct lu_env *env, const struct dt_it *di,
- void *key_rec)
-{
- LBUG();
- return 0;
+ it->ooi_next = hash;
+ rc = osp_md_index_it_next(env, (struct dt_it *)di);
+ if (rc == 1)
+ return 0;
+
+ if (rc == 0)
+ return 1;
+
+ return rc;
}
-static const struct dt_index_operations osp_md_index_ops = {
+const struct dt_index_operations osp_md_index_ops = {
.dio_lookup = osp_md_index_lookup,
- .dio_declare_insert = osp_md_declare_insert,
+ .dio_declare_insert = osp_md_declare_index_insert,
.dio_insert = osp_md_index_insert,
- .dio_declare_delete = osp_md_declare_delete,
+ .dio_declare_delete = osp_md_declare_index_delete,
.dio_delete = osp_md_index_delete,
.dio_it = {
.init = osp_it_init,
.fini = osp_it_fini,
.get = osp_it_get,
.put = osp_it_put,
- .next = osp_it_next,
+ .next = osp_md_index_it_next,
.key = osp_it_key,
.key_size = osp_it_key_size,
- .rec = osp_it_rec,
+ .rec = osp_md_index_it_rec,
.store = osp_it_store,
.load = osp_it_load,
.key_rec = osp_it_key_rec,
}
};
+/**
+ * Implementation of dt_object_operations::do_index_try
+ *
+ * Try to initialize the index API pointer for the given object. This
+ * is the entry point of the index API, i.e. we must call this method
+ * to initialize the index object before calling other index methods.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt index object to be initialized
+ * \param[in] feat the index feature of the object
+ *
+ * \retval 0 if the initialization succeeds.
+ * \retval negative errno if the initialization fails.
+ */
static int osp_md_index_try(const struct lu_env *env,
struct dt_object *dt,
const struct dt_index_features *feat)
return 0;
}
+/**
+ * Implementation of dt_object_operations::do_object_lock
+ *
+ * Enqueue a lock (by ldlm_cli_enqueue()) of remote object on the remote MDT,
+ * which will lock the object in the global namespace.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be locked
+ * \param[out] lh lock handle
+ * \param[in] einfo enqueue information
+ * \param[in] policy lock policy
+ *
+ * \retval ELDLM_OK if locking the object succeeds.
+ * \retval negative errno if locking fails.
+ */
static int osp_md_object_lock(const struct lu_env *env,
struct dt_object *dt,
struct lustre_handle *lh,
if (mode > 0)
return ELDLM_OK;
+ if (einfo->ei_nonblock)
+ flags |= LDLM_FL_BLOCK_NOWAIT;
+
req = ldlm_enqueue_pack(osp->opd_exp, 0);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
return rc == ELDLM_OK ? 0 : -EIO;
}
+/**
+ * Implementation of dt_object_operations::do_object_unlock
+ *
+ * Cancel a lock of a remote object.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be unlocked
+ * \param[in] einfo lock enqueue information
+ * \param[in] policy lock policy
+ *
+ * \retval Only return 0 for now.
+ */
static int osp_md_object_unlock(const struct lu_env *env,
struct dt_object *dt,
struct ldlm_enqueue_info *einfo,
return 0;
}
+/**
+ * Implement OSP layer dt_object_operations::do_declare_destroy() interface.
+ *
+ * Create the dt_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] dt pointer to the OSP layer dt_object to be destroyed
+ * \param[in] th pointer to the transaction handler
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
+int osp_md_declare_object_destroy(const struct lu_env *env,
+ struct dt_object *dt, struct thandle *th)
+{
+ return osp_trans_update_request_create(th);
+}
+
+/**
+ * Implement OSP layer dt_object_operations::do_destroy() interface.
+ *
+ * Pack the destroy update into the RPC buffer, which will be sent
+ * to the remote MDT during transaction stop.
+ *
+ * It also marks the object as non-cached.
+ *
+ * \param[in] env pointer to the thread context
+ * \param[in] dt pointer to the OSP layer dt_object to be destroyed
+ * \param[in] th pointer to the transaction handler
+ *
+ * \retval 0 for success
+ * \retval negative error number on failure
+ */
+int osp_md_object_destroy(const struct lu_env *env, struct dt_object *dt,
+ struct thandle *th)
+{
+ struct osp_object *o = dt2osp_obj(dt);
+ struct osp_device *osp = lu2osp_dev(dt->do_lu.lo_dev);
+ struct osp_update_request *update;
+ int rc = 0;
+
+ ENTRY;
+ o->opo_non_exist = 1;
+
+ LASSERT(osp->opd_connect_mdt);
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
+
+ rc = osp_update_rpc_pack(env, object_destroy, update, OUT_DESTROY,
+ lu_object_fid(&dt->do_lu));
+ if (rc != 0)
+ RETURN(rc);
+
+ set_bit(LU_OBJECT_HEARD_BANSHEE, &dt->do_lu.lo_header->loh_flags);
+ rc = osp_insert_update_callback(env, update, dt2osp_obj(dt), NULL,
+ NULL);
+
+ RETURN(rc);
+}
+
struct dt_object_operations osp_md_obj_ops = {
.do_read_lock = osp_md_object_read_lock,
.do_write_lock = osp_md_object_write_lock,
.do_declare_create = osp_md_declare_object_create,
.do_create = osp_md_object_create,
.do_declare_ref_add = osp_md_declare_ref_add,
- .do_ref_add = osp_md_object_ref_add,
- .do_declare_ref_del = osp_md_declare_object_ref_del,
- .do_ref_del = osp_md_object_ref_del,
- .do_declare_destroy = osp_declare_object_destroy,
- .do_destroy = osp_object_destroy,
+ .do_ref_add = osp_md_ref_add,
+ .do_declare_ref_del = osp_md_declare_ref_del,
+ .do_ref_del = osp_md_ref_del,
+ .do_declare_destroy = osp_md_declare_object_destroy,
+ .do_destroy = osp_md_object_destroy,
.do_ah_init = osp_md_ah_init,
.do_attr_get = osp_attr_get,
.do_declare_attr_set = osp_md_declare_attr_set,
.do_xattr_get = osp_xattr_get,
.do_declare_xattr_set = osp_declare_xattr_set,
.do_xattr_set = osp_xattr_set,
+ .do_declare_xattr_del = osp_declare_xattr_del,
+ .do_xattr_del = osp_xattr_del,
.do_index_try = osp_md_index_try,
.do_object_lock = osp_md_object_lock,
.do_object_unlock = osp_md_object_unlock,
};
+/**
+ * Implementation of dt_body_operations::dbo_declare_write
+ *
+ * Create the osp_update_request to track the update for this OSP
+ * in the transaction.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be written
+ * \param[in] buf buffer to write which includes an embedded size field
+ * \param[in] pos offet in the object to start writing at
+ * \param[in] th transaction handle
+ *
+ * \retval 0 if preparation succeeds.
+ * \retval negative errno if preparation fails.
+ */
static ssize_t osp_md_declare_write(const struct lu_env *env,
struct dt_object *dt,
const struct lu_buf *buf,
loff_t pos, struct thandle *th)
{
- struct dt_update_request *update;
- struct lu_fid *fid;
- int sizes[2] = {buf->lb_len, sizeof(pos)};
- const char *bufs[2] = {(char *)buf->lb_buf,
- (char *)&pos};
+ return osp_trans_update_request_create(th);
+}
+
+/**
+ * Implementation of dt_body_operations::dbo_write
+ *
+ * Pack the write object update into the RPC buffer, which will be sent
+ * to the remote MDT during transaction stop.
+ *
+ * \param[in] env execution environment
+ * \param[in] dt object to be written
+ * \param[in] buf buffer to write which includes an embedded size field
+ * \param[in] pos offet in the object to start writing at
+ * \param[in] th transaction handle
+ * \param[in] ignore_quota quota enforcement for this write
+ *
+ * \retval the buffer size in bytes if packing succeeds.
+ * \retval negative errno if packing fails.
+ */
+static ssize_t osp_md_write(const struct lu_env *env, struct dt_object *dt,
+ const struct lu_buf *buf, loff_t *pos,
+ struct thandle *th, int ignore_quota)
+{
+ struct osp_object *obj = dt2osp_obj(dt);
+ struct osp_update_request *update;
+ struct osp_thandle *oth = thandle_to_osp_thandle(th);
ssize_t rc;
+ ENTRY;
- update = out_find_create_update_loc(th, dt);
- if (IS_ERR(update)) {
- CERROR("%s: Get OSP update buf failed: rc = %d\n",
- dt->do_lu.lo_dev->ld_obd->obd_name,
- (int)PTR_ERR(update));
- return PTR_ERR(update);
- }
+ update = thandle_to_osp_update_request(th);
+ LASSERT(update != NULL);
- pos = cpu_to_le64(pos);
- bufs[1] = (char *)&pos;
- fid = (struct lu_fid *)lu_object_fid(&dt->do_lu);
- rc = out_insert_update(env, update, OUT_WRITE, fid,
- ARRAY_SIZE(sizes), sizes, bufs);
+ rc = osp_update_rpc_pack(env, write, update, OUT_WRITE,
+ lu_object_fid(&dt->do_lu), buf, *pos);
+ if (rc < 0)
+ RETURN(rc);
- return rc;
+ CDEBUG(D_INFO, "write "DFID" offset = "LPU64" length = %zu\n",
+ PFID(lu_object_fid(&dt->do_lu)), *pos, buf->lb_len);
+
+ /* XXX: how about the write error happened later? */
+ *pos += buf->lb_len;
+ if (obj->opo_ooa != NULL &&
+ obj->opo_ooa->ooa_attr.la_valid & LA_SIZE &&
+ obj->opo_ooa->ooa_attr.la_size < *pos)
+ obj->opo_ooa->ooa_attr.la_size = *pos;
+
+ rc = osp_check_and_set_rpc_version(oth);
+ if (rc < 0)
+ RETURN(rc);
+
+ RETURN(buf->lb_len);
}
-static ssize_t osp_md_write(const struct lu_env *env, struct dt_object *dt,
- const struct lu_buf *buf, loff_t *pos,
- struct thandle *handle,
- struct lustre_capa *capa, int ignore_quota)
+static ssize_t osp_md_read(const struct lu_env *env, struct dt_object *dt,
+ struct lu_buf *rbuf, loff_t *pos)
{
- return buf->lb_len;
+ struct osp_device *osp = lu2osp_dev(dt->do_lu.lo_dev);
+ struct dt_device *dt_dev = &osp->opd_dt_dev;
+ struct lu_buf *lbuf = &osp_env_info(env)->osi_lb2;
+ struct osp_update_request *update = NULL;
+ struct object_update_reply *reply;
+ struct out_read_reply *orr;
+ char *ptr = rbuf->lb_buf;
+ struct ptlrpc_request *req = NULL;
+ size_t total_length = rbuf->lb_len;
+ size_t max_buf_size;
+ loff_t offset = *pos;
+ int rc;
+ ENTRY;
+
+ /* Calculate the maxium buffer length for each read request */
+ max_buf_size = OUT_UPDATE_REPLY_SIZE - cfs_size_round(sizeof(*orr)) -
+ cfs_size_round(sizeof(struct object_update_result)) -
+ cfs_size_round(offsetof(struct object_update_reply,
+ ourp_lens[1]));
+ while (total_length > 0) {
+ size_t read_length;
+
+ /* Because it needs send the update buffer right away,
+ * just create an update buffer, instead of attaching the
+ * update_remote list of the thandle. */
+ update = osp_update_request_create(dt_dev);
+ if (IS_ERR(update))
+ GOTO(out, rc = PTR_ERR(update));
+
+ read_length = total_length > max_buf_size ?
+ max_buf_size : total_length;
+
+ rc = osp_update_rpc_pack(env, read, update, OUT_READ,
+ lu_object_fid(&dt->do_lu),
+ read_length, offset);
+ if (rc != 0) {
+ CERROR("%s: cannot insert update: rc = %d\n",
+ dt_dev->dd_lu_dev.ld_obd->obd_name, rc);
+ GOTO(out, rc);
+ }
+
+ rc = osp_remote_sync(env, osp, update, &req);
+ if (rc < 0)
+ GOTO(out, rc);
+
+ reply = req_capsule_server_sized_get(&req->rq_pill,
+ &RMF_OUT_UPDATE_REPLY,
+ OUT_UPDATE_REPLY_SIZE);
+
+ if (reply->ourp_magic != UPDATE_REPLY_MAGIC) {
+ CERROR("%s: invalid update reply magic %x expected %x:"
+ " rc = %d\n", dt_dev->dd_lu_dev.ld_obd->obd_name,
+ reply->ourp_magic, UPDATE_REPLY_MAGIC, -EPROTO);
+ GOTO(out, rc = -EPROTO);
+ }
+
+ rc = object_update_result_data_get(reply, lbuf, 0);
+ if (rc < 0)
+ GOTO(out, rc);
+
+ if (lbuf->lb_len < sizeof(*orr))
+ GOTO(out, rc = -EPROTO);
+
+ orr = lbuf->lb_buf;
+ orr_le_to_cpu(orr, orr);
+ offset = orr->orr_offset;
+ if (orr->orr_size > max_buf_size)
+ GOTO(out, rc = -EPROTO);
+
+ memcpy(ptr, orr->orr_data, orr->orr_size);
+ ptr += orr->orr_size;
+ total_length -= orr->orr_size;
+
+ CDEBUG(D_INFO, "%s: read "DFID" pos "LPU64" len %u left %zu\n",
+ osp->opd_obd->obd_name, PFID(lu_object_fid(&dt->do_lu)),
+ offset, orr->orr_size, total_length);
+
+ if (orr->orr_size < read_length)
+ break;
+
+ ptlrpc_req_finished(req);
+ osp_update_request_destroy(update);
+ req = NULL;
+ update = NULL;
+ }
+
+ total_length = rbuf->lb_len - total_length;
+ *pos = offset;
+ CDEBUG(D_INFO, "%s: total read "DFID" pos "LPU64" len %zu\n",
+ osp->opd_obd->obd_name, PFID(lu_object_fid(&dt->do_lu)),
+ *pos, total_length);
+ GOTO(out, rc = (int)total_length);
+out:
+ if (req != NULL)
+ ptlrpc_req_finished(req);
+
+ if (update != NULL)
+ osp_update_request_destroy(update);
+
+ return rc;
}
/* These body operation will be used to write symlinks during migration etc */
struct dt_body_operations osp_md_body_ops = {
.dbo_declare_write = osp_md_declare_write,
.dbo_write = osp_md_write,
+ .dbo_read = osp_md_read,
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff