/**
Application callBack:
THis the callback that is activated upon the recption of a disk
operation from a remote client: There is 2 kinds of requests that
are supported by this function:
READ and WRITE
@param socket_ctx_p: pointer to the af unix socket
@param socketId: reference of the socket (not used)
@retval : TRUE-> xmit ready event expected
@retval : FALSE-> xmit ready event not expected
*/
void rozofs_storcli_req_rcv_cbk(void *userRef,uint32_t socket_ctx_idx, void *recv_buf)
{
uint32_t *com_hdr_p;
rozofs_rpc_call_hdr_t hdr;
int errcode = EINVAL;
com_hdr_p = (uint32_t*) ruc_buf_getPayload(recv_buf);
com_hdr_p +=1; /* skip the size of the rpc message */
memcpy(&hdr,com_hdr_p,sizeof(rozofs_rpc_call_hdr_t));
scv_call_hdr_ntoh(&hdr);
/*
** get the opcode requested and dispatch the processing accordling to that opcode
*/
switch (hdr.proc)
{
case STORCLI_READ:
rozofs_storcli_read_req_init(socket_ctx_idx,recv_buf,rozofs_storcli_remote_rsp_cbk,0,STORCLI_DO_QUEUE);
return;
case STORCLI_WRITE:
rozofs_storcli_write_req_init(socket_ctx_idx,recv_buf,rozofs_storcli_remote_rsp_cbk);
return;
default:
/*
** Put code here to format a reply with an error message
*/
rozofs_storcli_reply_error_with_recv_buf(socket_ctx_idx,recv_buf,NULL,rozofs_storcli_remote_rsp_cbk,errcode);
return;
}
return;
}
/**
Initial truncate request
@param socket_ctx_p: pointer to the af unix socket
@param socketId: reference of the socket (not used)
@param rozofs_storcli_remote_rsp_cbk: callback for sending out the response
@retval : TRUE-> xmit ready event expected
@retval : FALSE-> xmit ready event not expected
*/
void rozofs_storcli_truncate_req_init(uint32_t socket_ctx_idx, void *recv_buf,rozofs_storcli_resp_pf_t rozofs_storcli_remote_rsp_cbk)
{
rozofs_rpc_call_hdr_with_sz_t *com_hdr_p;
rozofs_storcli_ctx_t *working_ctx_p = NULL;
int i;
uint32_t msg_len; /* length of the rpc messsage including the header length */
storcli_truncate_arg_t *storcli_truncate_rq_p = NULL;
rozofs_rpc_call_hdr_t hdr; /* structure that contains the rpc header in host format */
int len; /* effective length of application message */
uint8_t *pmsg; /* pointer to the first available byte in the application message */
uint32_t header_len;
XDR xdrs;
int errcode = EINVAL;
/*
** allocate a context for the duration of the write
*/
working_ctx_p = rozofs_storcli_alloc_context();
if (working_ctx_p == NULL)
{
/*
** that situation MUST not occur since there the same number of receive buffer and working context!!
*/
severe("out of working read/write saved context");
goto failure;
}
storcli_truncate_rq_p = &working_ctx_p->storcli_truncate_arg;
STORCLI_START_NORTH_PROF(working_ctx_p,truncate,0);
/*
** Get the full length of the message and adjust it the the length of the applicative part (RPC header+application msg)
*/
msg_len = ruc_buf_getPayloadLen(recv_buf);
msg_len -=sizeof(uint32_t);
/*
** save the reference of the received socket since it will be needed for sending back the
** response
*/
working_ctx_p->socketRef = socket_ctx_idx;
working_ctx_p->user_param = NULL;
working_ctx_p->recv_buf = recv_buf;
working_ctx_p->response_cbk = rozofs_storcli_remote_rsp_cbk;
/*
** Get the payload of the receive buffer and set the pointer to the array that describes the write request
*/
com_hdr_p = (rozofs_rpc_call_hdr_with_sz_t*) ruc_buf_getPayload(recv_buf);
memcpy(&hdr,&com_hdr_p->hdr,sizeof(rozofs_rpc_call_hdr_t));
/*
** swap the rpc header
*/
scv_call_hdr_ntoh(&hdr);
pmsg = rozofs_storcli_set_ptr_on_nfs_call_msg((char*)&com_hdr_p->hdr,&header_len);
if (pmsg == NULL)
{
errcode = EFAULT;
goto failure;
}
/*
** map the memory on the first applicative RPC byte available and prepare to decode:
** notice that we will not call XDR_FREE since the application MUST
** provide a pointer for storing the file handle
*/
len = msg_len - header_len;
xdrmem_create(&xdrs,(char*)pmsg,len,XDR_DECODE);
/*
** store the source transaction id needed for the reply
*/
working_ctx_p->src_transaction_id = hdr.hdr.xid;
/*
** decode the RPC message of the truncate request
*/
if (xdr_storcli_truncate_arg_t(&xdrs,storcli_truncate_rq_p) == FALSE)
{
/*
** decoding error
*/
errcode = EFAULT;
severe("rpc trucnate request decoding error");
goto failure;
}
/*
** init of the load balancing group/ projection association table:
** That table is ordered: the first corresponds to the storage associated with projection 0, second with 1, etc..
** When build that table, we MUST consider the value of the base which is associated with the distribution
*/
uint8_t rozofs_safe = rozofs_get_rozofs_safe(storcli_truncate_rq_p->layout);
int lbg_in_distribution = 0;
for (i = 0; i <rozofs_safe ; i ++)
{
/*
** Get the load balancing group associated with the sid
*/
int lbg_id = rozofs_storcli_get_lbg_for_sid(storcli_truncate_rq_p->cid,storcli_truncate_rq_p->dist_set[i]);
if (lbg_id < 0)
{
/*
** there is no associated between the sid and the lbg. It is typically the case
** when a new cluster has been added to the configuration and the client does not
** know yet the configuration change
*/
severe("sid is unknown !! %d\n",storcli_truncate_rq_p->dist_set[i]);
continue;
}
rozofs_storcli_lbg_prj_insert_lbg_and_sid(working_ctx_p->lbg_assoc_tb,lbg_in_distribution,
lbg_id,
storcli_truncate_rq_p->dist_set[i]);
rozofs_storcli_lbg_prj_insert_lbg_state(working_ctx_p->lbg_assoc_tb,
lbg_in_distribution,
NORTH_LBG_GET_STATE(working_ctx_p->lbg_assoc_tb[lbg_in_distribution].lbg_id));
lbg_in_distribution++;
if (lbg_in_distribution == rozofs_safe) break;
}
/*
** allocate a small buffer that will be used for sending the response to the truncate request
*/
working_ctx_p->xmitBuf = ruc_buf_getBuffer(ROZOFS_STORCLI_NORTH_SMALL_POOL);
if (working_ctx_p == NULL)
{
/*
** that situation MUST not occur since there the same number of receive buffer and working context!!
*/
errcode = ENOMEM;
severe("out of small buffer");
goto failure;
}
/*
** allocate a sequence number for the working context (same aas for read)
*/
working_ctx_p->read_seqnum = rozofs_storcli_allocate_read_seqnum();
/*
** set now the working variable specific for handling the truncate
** we re-use the structure used for writing even if nothing is written
*/
uint8_t forward_projection = rozofs_get_rozofs_forward(storcli_truncate_rq_p->layout);
for (i = 0; i < forward_projection; i++)
{
working_ctx_p->prj_ctx[i].prj_state = ROZOFS_PRJ_READ_IDLE;
working_ctx_p->prj_ctx[i].prj_buf = ruc_buf_getBuffer(ROZOFS_STORCLI_SOUTH_LARGE_POOL);
if (working_ctx_p->prj_ctx[i].prj_buf == NULL)
{
/*
** that situation MUST not occur since there the same number of receive buffer and working context!!
*/
errcode = ENOMEM;
severe("out of large buffer");
goto failure;
}
/*
** increment inuse counter on each buffer since we might need to re-use that packet in case
** of retransmission
*/
working_ctx_p->prj_ctx[i].inuse_valid = 1;
ruc_buf_inuse_increment(working_ctx_p->prj_ctx[i].prj_buf);
/*
** set the pointer to the bins
*/
int position = rozofs_storcli_get_position_of_first_byte2write_in_truncate();
uint8_t *pbuf = (uint8_t*)ruc_buf_getPayload(working_ctx_p->prj_ctx[i].prj_buf);
working_ctx_p->prj_ctx[i].bins = (bin_t*)(pbuf+position);
}
/*
** Prepare for request serialization
*/
memcpy(working_ctx_p->fid_key, storcli_truncate_rq_p->fid, sizeof (sp_uuid_t));
working_ctx_p->opcode_key = STORCLI_TRUNCATE;
{
/**
* lock all the file for a truncate
*/
uint64_t nb_blocks = 0;
nb_blocks--;
int ret;
ret = stc_rng_insert((void*)working_ctx_p,
STORCLI_READ,working_ctx_p->fid_key,
0,nb_blocks,
&working_ctx_p->sched_idx);
if (ret == 0)
{
/*
** there is a current request that is processed with the same fid and there is a collision
*/
return;
}
/*
** no request pending with that fid, so we can process it right away
*/
return rozofs_storcli_truncate_req_processing(working_ctx_p);
}
/*
**_____________________________________________
** Exception cases
**_____________________________________________
*/
/*
** there was a failure while attempting to allocate a memory ressource.
*/
failure:
/*
** send back the response with the appropriated error code.
** note: The received buffer (rev_buf) is
** intended to be released by this service in case of error or the TCP transmitter
** once it has been passed to the TCP stack.
*/
rozofs_storcli_reply_error_with_recv_buf(socket_ctx_idx,recv_buf,NULL,rozofs_storcli_remote_rsp_cbk,errcode);
/*
** check if the root context was allocated. Free it if is exist
*/
if (working_ctx_p != NULL)
{
/*
** remove the reference to the recvbuf to avoid releasing it twice
*/
STORCLI_STOP_NORTH_PROF(working_ctx_p,truncate,0);
working_ctx_p->recv_buf = NULL;
rozofs_storcli_release_context(working_ctx_p);
}
return;
}
