static ssize_t osp_md_read(const struct lu_env *env, struct dt_object *dt,
struct lu_buf *rbuf, loff_t *pos)
{
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;
char *ptr = rbuf->lb_buf;
struct osp_update_request *update;
struct ptlrpc_request *req = NULL;
struct out_read_reply *orr;
struct ptlrpc_bulk_desc *desc;
struct object_update_reply *reply;
__u32 left_size;
int nbufs;
int i;
int rc;
ENTRY;
/* 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))
RETURN(PTR_ERR(update));
rc = osp_update_rpc_pack(env, read, update, OUT_READ,
lu_object_fid(&dt->do_lu),
rbuf->lb_len, *pos);
if (rc != 0) {
CERROR("%s: cannot insert update: rc = %d\n",
dt_dev->dd_lu_dev.ld_obd->obd_name, rc);
GOTO(out_update, rc);
}
CDEBUG(D_INFO, "%s "DFID" read offset %llu size %zu\n",
dt_dev->dd_lu_dev.ld_obd->obd_name,
PFID(lu_object_fid(&dt->do_lu)), *pos, rbuf->lb_len);
rc = osp_prep_update_req(env, osp->opd_obd->u.cli.cl_import, update,
&req);
if (rc != 0)
GOTO(out_update, rc);
nbufs = (rbuf->lb_len + OUT_BULK_BUFFER_SIZE - 1) /
OUT_BULK_BUFFER_SIZE;
/* allocate bulk descriptor */
desc = ptlrpc_prep_bulk_imp(req, nbufs, 1,
PTLRPC_BULK_PUT_SINK | PTLRPC_BULK_BUF_KVEC,
MDS_BULK_PORTAL, &ptlrpc_bulk_kvec_ops);
if (desc == NULL)
GOTO(out, rc = -ENOMEM);
/* split the buffer into small chunk size */
left_size = rbuf->lb_len;
for (i = 0; i < nbufs; i++) {
int read_size;
read_size = left_size > OUT_BULK_BUFFER_SIZE ?
OUT_BULK_BUFFER_SIZE : left_size;
desc->bd_frag_ops->add_iov_frag(desc, ptr, read_size);
ptr += read_size;
}
/* This will only be called with read-only update, and these updates
* might be used to retrieve update log during recovery process, so
* it will be allowed to send during recovery process */
req->rq_allow_replay = 1;
req->rq_bulk_read = 1;
/* send request to master and wait for RPC to complete */
rc = ptlrpc_queue_wait(req);
if (rc != 0)
GOTO(out, rc);
rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
req->rq_bulk->bd_nob_transferred);
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);
rc = orr->orr_size;
*pos = orr->orr_offset;
out:
ptlrpc_req_finished(req);
out_update:
osp_update_request_destroy(update);
RETURN(rc);
}
/*
* Fetch a global or slave index from the QMT.
*
* \param env - the environment passed by the caller
* \param exp - is the export to use to issue the OBD_IDX_READ RPC
* \param ii - is the index information to be packed in the request
* on success, the index information returned by the server
* is copied there.
* \param npages - is the number of pages in the pages array
* \param pages - is an array of @npages pages
*
* \retval 0 - success
* \retval -ve - appropriate errors
*/
int qsd_fetch_index(const struct lu_env *env, struct obd_export *exp,
struct idx_info *ii, unsigned int npages,
struct page **pages, bool *need_swab)
{
struct ptlrpc_request *req;
struct idx_info *req_ii;
struct ptlrpc_bulk_desc *desc;
int rc, i;
ENTRY;
LASSERT(exp);
req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OBD_IDX_READ);
if (req == NULL)
RETURN(-ENOMEM);
rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, OBD_IDX_READ);
if (rc) {
ptlrpc_request_free(req);
RETURN(rc);
}
req->rq_request_portal = MDS_READPAGE_PORTAL;
ptlrpc_at_set_req_timeout(req);
/* allocate bulk descriptor */
desc = ptlrpc_prep_bulk_imp(req, npages, 1, BULK_PUT_SINK,
MDS_BULK_PORTAL);
if (desc == NULL) {
ptlrpc_request_free(req);
RETURN(-ENOMEM);
}
/* req now owns desc and will free it when it gets freed */
for (i = 0; i < npages; i++)
ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
/* pack index information in request */
req_ii = req_capsule_client_get(&req->rq_pill, &RMF_IDX_INFO);
*req_ii = *ii;
ptlrpc_request_set_replen(req);
/* send request to master and wait for RPC to complete */
rc = ptlrpc_queue_wait(req);
if (rc)
GOTO(out, rc);
rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
req->rq_bulk->bd_nob_transferred);
if (rc < 0)
GOTO(out, rc);
else
/* sptlrpc_cli_unwrap_bulk_read() returns the number of bytes
* transferred*/
rc = 0;
req_ii = req_capsule_server_get(&req->rq_pill, &RMF_IDX_INFO);
*ii = *req_ii;
*need_swab = ptlrpc_rep_need_swab(req);
EXIT;
out:
ptlrpc_req_finished(req);
return rc;
}
