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[SCSI] zfcp: remove union zfcp_req_data, use unit refcount for FCP commands
o union zfcp_req_data removed o increment unit refcount when processing FCP commands (This fixes a theoretical race: When all scsi commands of a unit are aborted and the scsi_device is removed then the unit could be removed before all fsf_requests of that unit are completely processed.) Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Andreas Herrmann
James Bottomley
parent
3734d24b2e
commit
059c97d043
4 changed files with 80 additions and 274 deletions
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@ -141,7 +141,7 @@ zfcp_cmd_dbf_event_fsf(const char *text, struct zfcp_fsf_req *fsf_req,
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spin_lock_irqsave(&adapter->dbf_lock, flags);
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if (zfcp_fsf_req_is_scsi_cmnd(fsf_req)) {
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scsi_cmnd = fsf_req->data.send_fcp_command_task.scsi_cmnd;
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scsi_cmnd = (struct scsi_cmnd*) fsf_req->data;
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debug_text_event(adapter->cmd_dbf, level, "fsferror");
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debug_text_event(adapter->cmd_dbf, level, text);
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debug_event(adapter->cmd_dbf, level, &fsf_req,
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@ -167,14 +167,12 @@ void
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zfcp_cmd_dbf_event_scsi(const char *text, struct scsi_cmnd *scsi_cmnd)
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{
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struct zfcp_adapter *adapter;
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union zfcp_req_data *req_data;
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struct zfcp_fsf_req *fsf_req;
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int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
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unsigned long flags;
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adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
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req_data = (union zfcp_req_data *) scsi_cmnd->host_scribble;
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fsf_req = (req_data ? req_data->send_fcp_command_task.fsf_req : NULL);
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fsf_req = (struct zfcp_fsf_req *) scsi_cmnd->host_scribble;
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spin_lock_irqsave(&adapter->dbf_lock, flags);
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debug_text_event(adapter->cmd_dbf, level, "hostbyte");
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debug_text_event(adapter->cmd_dbf, level, text);
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@ -1609,7 +1607,7 @@ zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
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u32 els_type;
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struct zfcp_adapter *adapter;
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status_buffer = fsf_req->data.status_read.buffer;
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status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
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els_type = *(u32 *) (status_buffer->payload);
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adapter = fsf_req->adapter;
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@ -635,45 +635,6 @@ struct zfcp_adapter_mempool {
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mempool_t *data_gid_pn;
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};
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struct zfcp_exchange_config_data{
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};
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struct zfcp_open_port {
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struct zfcp_port *port;
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};
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struct zfcp_close_port {
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struct zfcp_port *port;
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};
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struct zfcp_open_unit {
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struct zfcp_unit *unit;
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};
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struct zfcp_close_unit {
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struct zfcp_unit *unit;
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};
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struct zfcp_close_physical_port {
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struct zfcp_port *port;
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};
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struct zfcp_send_fcp_command_task {
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struct zfcp_fsf_req *fsf_req;
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struct zfcp_unit *unit;
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struct scsi_cmnd *scsi_cmnd;
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unsigned long start_jiffies;
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};
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struct zfcp_send_fcp_command_task_management {
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struct zfcp_unit *unit;
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};
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struct zfcp_abort_fcp_command {
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struct zfcp_fsf_req *fsf_req;
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struct zfcp_unit *unit;
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};
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/*
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* header for CT_IU
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*/
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@ -781,33 +742,6 @@ struct zfcp_send_els {
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int status;
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};
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struct zfcp_status_read {
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struct fsf_status_read_buffer *buffer;
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};
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struct zfcp_fsf_done {
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struct completion *complete;
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int status;
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};
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/* request specific data */
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union zfcp_req_data {
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struct zfcp_exchange_config_data exchange_config_data;
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struct zfcp_open_port open_port;
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struct zfcp_close_port close_port;
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struct zfcp_open_unit open_unit;
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struct zfcp_close_unit close_unit;
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struct zfcp_close_physical_port close_physical_port;
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struct zfcp_send_fcp_command_task send_fcp_command_task;
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struct zfcp_send_fcp_command_task_management
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send_fcp_command_task_management;
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struct zfcp_abort_fcp_command abort_fcp_command;
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struct zfcp_send_ct *send_ct;
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struct zfcp_send_els *send_els;
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struct zfcp_status_read status_read;
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struct fsf_qtcb_bottom_port *port_data;
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};
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struct zfcp_qdio_queue {
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struct qdio_buffer *buffer[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
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u8 free_index; /* index of next free bfr
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@ -963,11 +897,12 @@ struct zfcp_fsf_req {
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u32 fsf_command; /* FSF Command copy */
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struct fsf_qtcb *qtcb; /* address of associated QTCB */
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u32 seq_no; /* Sequence number of request */
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union zfcp_req_data data; /* Info fields of request */
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unsigned long data; /* private data of request */
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struct zfcp_erp_action *erp_action; /* used if this request is
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issued on behalf of erp */
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mempool_t *pool; /* used if request was alloacted
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from emergency pool */
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struct zfcp_unit *unit;
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};
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typedef void zfcp_fsf_req_handler_t(struct zfcp_fsf_req*);
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@ -821,7 +821,7 @@ zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
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goto failed_buf;
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}
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memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
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fsf_req->data.status_read.buffer = status_buffer;
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fsf_req->data = (unsigned long) status_buffer;
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/* insert pointer to respective buffer */
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sbale = zfcp_qdio_sbale_curr(fsf_req);
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@ -859,7 +859,7 @@ zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
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struct zfcp_port *port;
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unsigned long flags;
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status_buffer = fsf_req->data.status_read.buffer;
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status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
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adapter = fsf_req->adapter;
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read_lock_irqsave(&zfcp_data.config_lock, flags);
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@ -918,7 +918,7 @@ zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
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int retval = 0;
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struct zfcp_adapter *adapter = fsf_req->adapter;
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struct fsf_status_read_buffer *status_buffer =
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fsf_req->data.status_read.buffer;
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(struct fsf_status_read_buffer *) fsf_req->data;
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
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mempool_free(status_buffer, adapter->pool.data_status_read);
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@ -1093,7 +1093,7 @@ zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
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sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
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sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
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fsf_req->data.abort_fcp_command.unit = unit;
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fsf_req->data = (unsigned long) unit;
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/* set handles of unit and its parent port in QTCB */
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fsf_req->qtcb->header.lun_handle = unit->handle;
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@ -1139,7 +1139,7 @@ static int
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zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
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{
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int retval = -EINVAL;
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struct zfcp_unit *unit = new_fsf_req->data.abort_fcp_command.unit;
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struct zfcp_unit *unit;
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unsigned char status_qual =
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new_fsf_req->qtcb->header.fsf_status_qual.word[0];
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@ -1150,6 +1150,8 @@ zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
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goto skip_fsfstatus;
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}
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unit = (struct zfcp_unit *) new_fsf_req->data;
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/* evaluate FSF status in QTCB */
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switch (new_fsf_req->qtcb->header.fsf_status) {
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@ -1414,7 +1416,7 @@ zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
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fsf_req->qtcb->header.port_handle = port->handle;
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fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
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fsf_req->qtcb->bottom.support.timeout = ct->timeout;
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fsf_req->data.send_ct = ct;
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fsf_req->data = (unsigned long) ct;
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/* start QDIO request for this FSF request */
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ret = zfcp_fsf_req_send(fsf_req, ct->timer);
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@ -1445,10 +1447,10 @@ zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
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* zfcp_fsf_send_ct_handler - handler for Generic Service requests
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* @fsf_req: pointer to struct zfcp_fsf_req
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*
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* Data specific for the Generic Service request is passed by
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* fsf_req->data.send_ct
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* Usually a specific handler for the request is called via
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* fsf_req->data.send_ct->handler at end of this function.
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* Data specific for the Generic Service request is passed using
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* fsf_req->data. There we find the pointer to struct zfcp_send_ct.
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* Usually a specific handler for the CT request is called which is
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* found in this structure.
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*/
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static int
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zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
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@ -1462,7 +1464,7 @@ zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
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u16 subtable, rule, counter;
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adapter = fsf_req->adapter;
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send_ct = fsf_req->data.send_ct;
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send_ct = (struct zfcp_send_ct *) fsf_req->data;
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port = send_ct->port;
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header = &fsf_req->qtcb->header;
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bottom = &fsf_req->qtcb->bottom.support;
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@ -1714,7 +1716,7 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
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fsf_req->qtcb->bottom.support.d_id = d_id;
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fsf_req->qtcb->bottom.support.service_class = adapter->fc_service_class;
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fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
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fsf_req->data.send_els = els;
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fsf_req->data = (unsigned long) els;
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sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
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@ -1746,10 +1748,10 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
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* zfcp_fsf_send_els_handler - handler for ELS commands
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* @fsf_req: pointer to struct zfcp_fsf_req
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*
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* Data specific for the ELS command is passed by
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* fsf_req->data.send_els
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* Usually a specific handler for the command is called via
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* fsf_req->data.send_els->handler at end of this function.
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* Data specific for the ELS command is passed using
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* fsf_req->data. There we find the pointer to struct zfcp_send_els.
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* Usually a specific handler for the ELS command is called which is
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* found in this structure.
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*/
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static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
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{
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@ -1762,7 +1764,7 @@ static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
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int retval = -EINVAL;
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u16 subtable, rule, counter;
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send_els = fsf_req->data.send_els;
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send_els = (struct zfcp_send_els *) fsf_req->data;
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adapter = send_els->adapter;
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port = send_els->port;
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d_id = send_els->d_id;
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@ -2211,12 +2213,12 @@ zfcp_fsf_exchange_port_data(struct zfcp_adapter *adapter,
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goto out;
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}
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fsf_req->data = (unsigned long) data;
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sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
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sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
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sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
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fsf_req->data.port_data = data;
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init_timer(timer);
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timer->function = zfcp_fsf_request_timeout_handler;
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timer->data = (unsigned long) adapter;
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@ -2257,7 +2259,9 @@ static void
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zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
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{
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struct fsf_qtcb_bottom_port *bottom;
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struct fsf_qtcb_bottom_port *data = fsf_req->data.port_data;
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struct fsf_qtcb_bottom_port *data;
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data = (struct fsf_qtcb_bottom_port*) fsf_req->data;
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
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return;
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@ -2312,7 +2316,7 @@ zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
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erp_action->fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
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atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
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erp_action->fsf_req->data.open_port.port = erp_action->port;
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erp_action->fsf_req->data = (unsigned long) erp_action->port;
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erp_action->fsf_req->erp_action = erp_action;
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/* start QDIO request for this FSF request */
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@ -2353,7 +2357,7 @@ zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
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struct fsf_qtcb_header *header;
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u16 subtable, rule, counter;
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port = fsf_req->data.open_port.port;
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port = (struct zfcp_port *) fsf_req->data;
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header = &fsf_req->qtcb->header;
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
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@ -2566,7 +2570,7 @@ zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
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sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
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atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
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erp_action->fsf_req->data.close_port.port = erp_action->port;
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erp_action->fsf_req->data = (unsigned long) erp_action->port;
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erp_action->fsf_req->erp_action = erp_action;
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erp_action->fsf_req->qtcb->header.port_handle =
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erp_action->port->handle;
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@ -2606,7 +2610,7 @@ zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
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int retval = -EINVAL;
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struct zfcp_port *port;
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port = fsf_req->data.close_port.port;
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port = (struct zfcp_port *) fsf_req->data;
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
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/* don't change port status in our bookkeeping */
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@ -2703,7 +2707,7 @@ zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
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atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
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&erp_action->port->status);
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/* save a pointer to this port */
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erp_action->fsf_req->data.close_physical_port.port = erp_action->port;
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erp_action->fsf_req->data = (unsigned long) erp_action->port;
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/* port to be closeed */
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erp_action->fsf_req->qtcb->header.port_handle =
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erp_action->port->handle;
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@ -2747,7 +2751,7 @@ zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
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struct fsf_qtcb_header *header;
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u16 subtable, rule, counter;
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port = fsf_req->data.close_physical_port.port;
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port = (struct zfcp_port *) fsf_req->data;
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header = &fsf_req->qtcb->header;
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
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@ -2911,7 +2915,7 @@ zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
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erp_action->fsf_req->qtcb->bottom.support.option =
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FSF_OPEN_LUN_SUPPRESS_BOXING;
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atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
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erp_action->fsf_req->data.open_unit.unit = erp_action->unit;
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erp_action->fsf_req->data = (unsigned long) erp_action->unit;
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erp_action->fsf_req->erp_action = erp_action;
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/* start QDIO request for this FSF request */
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@ -2957,7 +2961,7 @@ zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
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u16 subtable, rule, counter;
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u32 allowed, exclusive, readwrite;
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unit = fsf_req->data.open_unit.unit;
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unit = (struct zfcp_unit *) fsf_req->data;
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if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
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/* don't change unit status in our bookkeeping */
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@ -3242,7 +3246,7 @@ zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
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erp_action->port->handle;
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erp_action->fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
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atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
|
||||
erp_action->fsf_req->data.close_unit.unit = erp_action->unit;
|
||||
erp_action->fsf_req->data = (unsigned long) erp_action->unit;
|
||||
erp_action->fsf_req->erp_action = erp_action;
|
||||
|
||||
/* start QDIO request for this FSF request */
|
||||
|
|
@ -3281,7 +3285,7 @@ zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
|
|||
int retval = -EINVAL;
|
||||
struct zfcp_unit *unit;
|
||||
|
||||
unit = fsf_req->data.close_unit.unit; /* restore unit */
|
||||
unit = (struct zfcp_unit *) fsf_req->data;
|
||||
|
||||
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
|
||||
/* don't change unit status in our bookkeeping */
|
||||
|
|
@ -3436,21 +3440,14 @@ zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
|
|||
goto failed_req_create;
|
||||
}
|
||||
|
||||
/*
|
||||
* associate FSF request with SCSI request
|
||||
* (need this for look up on abort)
|
||||
*/
|
||||
fsf_req->data.send_fcp_command_task.fsf_req = fsf_req;
|
||||
scsi_cmnd->host_scribble = (char *) &(fsf_req->data);
|
||||
zfcp_unit_get(unit);
|
||||
fsf_req->unit = unit;
|
||||
|
||||
/*
|
||||
* associate SCSI command with FSF request
|
||||
* (need this for look up on normal command completion)
|
||||
*/
|
||||
fsf_req->data.send_fcp_command_task.scsi_cmnd = scsi_cmnd;
|
||||
fsf_req->data.send_fcp_command_task.start_jiffies = jiffies;
|
||||
fsf_req->data.send_fcp_command_task.unit = unit;
|
||||
ZFCP_LOG_DEBUG("unit=%p, fcp_lun=0x%016Lx\n", unit, unit->fcp_lun);
|
||||
/* associate FSF request with SCSI request (for look up on abort) */
|
||||
scsi_cmnd->host_scribble = (char *) fsf_req;
|
||||
|
||||
/* associate SCSI command with FSF request */
|
||||
fsf_req->data = (unsigned long) scsi_cmnd;
|
||||
|
||||
/* set handles of unit and its parent port in QTCB */
|
||||
fsf_req->qtcb->header.lun_handle = unit->handle;
|
||||
|
|
@ -3584,6 +3581,7 @@ zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
|
|||
send_failed:
|
||||
no_fit:
|
||||
failed_scsi_cmnd:
|
||||
zfcp_unit_put(unit);
|
||||
zfcp_fsf_req_free(fsf_req);
|
||||
fsf_req = NULL;
|
||||
scsi_cmnd->host_scribble = NULL;
|
||||
|
|
@ -3640,7 +3638,7 @@ zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
|
|||
* hold a pointer to the unit being target of this
|
||||
* task management request
|
||||
*/
|
||||
fsf_req->data.send_fcp_command_task_management.unit = unit;
|
||||
fsf_req->data = (unsigned long) unit;
|
||||
|
||||
/* set FSF related fields in QTCB */
|
||||
fsf_req->qtcb->header.lun_handle = unit->handle;
|
||||
|
|
@ -3706,9 +3704,9 @@ zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
|
|||
header = &fsf_req->qtcb->header;
|
||||
|
||||
if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
|
||||
unit = fsf_req->data.send_fcp_command_task_management.unit;
|
||||
unit = (struct zfcp_unit *) fsf_req->data;
|
||||
else
|
||||
unit = fsf_req->data.send_fcp_command_task.unit;
|
||||
unit = fsf_req->unit;
|
||||
|
||||
if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
|
||||
/* go directly to calls of special handlers */
|
||||
|
|
@ -3947,6 +3945,8 @@ zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
|
|||
zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
|
||||
} else {
|
||||
retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
|
||||
fsf_req->unit = NULL;
|
||||
zfcp_unit_put(unit);
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
|
|
@ -3970,10 +3970,10 @@ zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
|
|||
u32 sns_len;
|
||||
char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
|
||||
unsigned long flags;
|
||||
struct zfcp_unit *unit = fsf_req->data.send_fcp_command_task.unit;
|
||||
struct zfcp_unit *unit = fsf_req->unit;
|
||||
|
||||
read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
|
||||
scpnt = fsf_req->data.send_fcp_command_task.scsi_cmnd;
|
||||
scpnt = (struct scsi_cmnd *) fsf_req->data;
|
||||
if (unlikely(!scpnt)) {
|
||||
ZFCP_LOG_DEBUG
|
||||
("Command with fsf_req %p is not associated to "
|
||||
|
|
@ -4198,8 +4198,7 @@ zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
|
|||
struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
|
||||
&(fsf_req->qtcb->bottom.io.fcp_rsp);
|
||||
char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
|
||||
struct zfcp_unit *unit =
|
||||
fsf_req->data.send_fcp_command_task_management.unit;
|
||||
struct zfcp_unit *unit = (struct zfcp_unit *) fsf_req->data;
|
||||
|
||||
del_timer(&fsf_req->adapter->scsi_er_timer);
|
||||
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
|
||||
|
|
|
|||
|
|
@ -414,67 +414,37 @@ zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
|
|||
return (struct zfcp_port *) NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* function: zfcp_scsi_eh_abort_handler
|
||||
/**
|
||||
* zfcp_scsi_eh_abort_handler - abort the specified SCSI command
|
||||
* @scpnt: pointer to scsi_cmnd to be aborted
|
||||
* Return: SUCCESS - command has been aborted and cleaned up in internal
|
||||
* bookkeeping, SCSI stack won't be called for aborted command
|
||||
* FAILED - otherwise
|
||||
*
|
||||
* purpose: tries to abort the specified (timed out) SCSI command
|
||||
*
|
||||
* note: We do not need to care for a SCSI command which completes
|
||||
* normally but late during this abort routine runs.
|
||||
* We are allowed to return late commands to the SCSI stack.
|
||||
* It tracks the state of commands and will handle late commands.
|
||||
* (Usually, the normal completion of late commands is ignored with
|
||||
* respect to the running abort operation. Grep for 'done_late'
|
||||
* in the SCSI stacks sources.)
|
||||
*
|
||||
* returns: SUCCESS - command has been aborted and cleaned up in internal
|
||||
* bookkeeping,
|
||||
* SCSI stack won't be called for aborted command
|
||||
* FAILED - otherwise
|
||||
* We do not need to care for a SCSI command which completes normally
|
||||
* but late during this abort routine runs. We are allowed to return
|
||||
* late commands to the SCSI stack. It tracks the state of commands and
|
||||
* will handle late commands. (Usually, the normal completion of late
|
||||
* commands is ignored with respect to the running abort operation.)
|
||||
*/
|
||||
int
|
||||
__zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
|
||||
zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
|
||||
{
|
||||
struct Scsi_Host *scsi_host;
|
||||
struct zfcp_adapter *adapter;
|
||||
struct zfcp_unit *unit;
|
||||
int retval = SUCCESS;
|
||||
struct zfcp_fsf_req *new_fsf_req, *old_fsf_req;
|
||||
struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
|
||||
struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
|
||||
struct zfcp_port *port = unit->port;
|
||||
struct Scsi_Host *scsi_host = scpnt->device->host;
|
||||
union zfcp_req_data *req_data = NULL;
|
||||
unsigned long flags;
|
||||
u32 status = 0;
|
||||
|
||||
/* the components of a abort_dbf record (fixed size record) */
|
||||
u64 dbf_scsi_cmnd = (unsigned long) scpnt;
|
||||
char dbf_opcode[ZFCP_ABORT_DBF_LENGTH];
|
||||
wwn_t dbf_wwn = port->wwpn;
|
||||
fcp_lun_t dbf_fcp_lun = unit->fcp_lun;
|
||||
u64 dbf_retries = scpnt->retries;
|
||||
u64 dbf_allowed = scpnt->allowed;
|
||||
u64 dbf_timeout = 0;
|
||||
u64 dbf_fsf_req = 0;
|
||||
u64 dbf_fsf_status = 0;
|
||||
u64 dbf_fsf_qual[2] = { 0, 0 };
|
||||
char dbf_result[ZFCP_ABORT_DBF_LENGTH] = "##undef";
|
||||
|
||||
memset(dbf_opcode, 0, ZFCP_ABORT_DBF_LENGTH);
|
||||
memcpy(dbf_opcode,
|
||||
scpnt->cmnd,
|
||||
min(scpnt->cmd_len, (unsigned char) ZFCP_ABORT_DBF_LENGTH));
|
||||
scsi_host = scpnt->device->host;
|
||||
adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
|
||||
unit = (struct zfcp_unit *) scpnt->device->hostdata;
|
||||
|
||||
ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
|
||||
scpnt, zfcp_get_busid_by_adapter(adapter));
|
||||
|
||||
spin_unlock_irq(scsi_host->host_lock);
|
||||
|
||||
/*
|
||||
* Race condition between normal (late) completion and abort has
|
||||
* to be avoided.
|
||||
* The entirity of all accesses to scsi_req have to be atomic.
|
||||
* scsi_req is usually part of the fsf_req and thus we block the
|
||||
* release of fsf_req as long as we need to access scsi_req.
|
||||
*/
|
||||
/* avoid race condition between late normal completion and abort */
|
||||
write_lock_irqsave(&adapter->abort_lock, flags);
|
||||
|
||||
/*
|
||||
|
|
@ -484,144 +454,48 @@ __zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
|
|||
* this routine returns. (scpnt is parameter passed to this routine
|
||||
* and must not disappear during abort even on late completion.)
|
||||
*/
|
||||
req_data = (union zfcp_req_data *) scpnt->host_scribble;
|
||||
/* DEBUG */
|
||||
ZFCP_LOG_DEBUG("req_data=%p\n", req_data);
|
||||
if (!req_data) {
|
||||
ZFCP_LOG_DEBUG("late command completion overtook abort\n");
|
||||
/*
|
||||
* That's it.
|
||||
* Do not initiate abort but return SUCCESS.
|
||||
*/
|
||||
write_unlock_irqrestore(&adapter->abort_lock, flags);
|
||||
retval = SUCCESS;
|
||||
strncpy(dbf_result, "##late1", ZFCP_ABORT_DBF_LENGTH);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Figure out which fsf_req needs to be aborted. */
|
||||
old_fsf_req = req_data->send_fcp_command_task.fsf_req;
|
||||
|
||||
dbf_fsf_req = (unsigned long) old_fsf_req;
|
||||
dbf_timeout =
|
||||
(jiffies - req_data->send_fcp_command_task.start_jiffies) / HZ;
|
||||
|
||||
ZFCP_LOG_DEBUG("old_fsf_req=%p\n", old_fsf_req);
|
||||
old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
|
||||
if (!old_fsf_req) {
|
||||
write_unlock_irqrestore(&adapter->abort_lock, flags);
|
||||
ZFCP_LOG_NORMAL("bug: no old fsf request found\n");
|
||||
ZFCP_LOG_NORMAL("req_data:\n");
|
||||
ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
|
||||
(char *) req_data, sizeof (union zfcp_req_data));
|
||||
ZFCP_LOG_NORMAL("scsi_cmnd:\n");
|
||||
ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
|
||||
(char *) scpnt, sizeof (struct scsi_cmnd));
|
||||
retval = FAILED;
|
||||
strncpy(dbf_result, "##bug:r", ZFCP_ABORT_DBF_LENGTH);
|
||||
goto out;
|
||||
}
|
||||
old_fsf_req->data.send_fcp_command_task.scsi_cmnd = NULL;
|
||||
/* mark old request as being aborted */
|
||||
old_fsf_req->data = 0;
|
||||
old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
|
||||
/*
|
||||
* We have to collect all information (e.g. unit) needed by
|
||||
* zfcp_fsf_abort_fcp_command before calling that routine
|
||||
* since that routine is not allowed to access
|
||||
* fsf_req which it is going to abort.
|
||||
* This is because of we need to release fsf_req_list_lock
|
||||
* before calling zfcp_fsf_abort_fcp_command.
|
||||
* Since this lock will not be held, fsf_req may complete
|
||||
* late and may be released meanwhile.
|
||||
*/
|
||||
ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit);
|
||||
|
||||
/*
|
||||
* We block (call schedule)
|
||||
* That's why we must release the lock and enable the
|
||||
* interrupts before.
|
||||
* On the other hand we do not need the lock anymore since
|
||||
* all critical accesses to scsi_req are done.
|
||||
*/
|
||||
/* don't access old_fsf_req after releasing the abort_lock */
|
||||
write_unlock_irqrestore(&adapter->abort_lock, flags);
|
||||
/* call FSF routine which does the abort */
|
||||
new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
|
||||
adapter, unit, 0);
|
||||
ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req);
|
||||
if (!new_fsf_req) {
|
||||
retval = FAILED;
|
||||
ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd "
|
||||
"failed\n");
|
||||
strncpy(dbf_result, "##nores", ZFCP_ABORT_DBF_LENGTH);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* wait for completion of abort */
|
||||
ZFCP_LOG_DEBUG("waiting for cleanup...\n");
|
||||
#if 1
|
||||
/*
|
||||
* FIXME:
|
||||
* copying zfcp_fsf_req_wait_and_cleanup code is not really nice
|
||||
*/
|
||||
__wait_event(new_fsf_req->completion_wq,
|
||||
new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
|
||||
status = new_fsf_req->status;
|
||||
dbf_fsf_status = new_fsf_req->qtcb->header.fsf_status;
|
||||
/*
|
||||
* Ralphs special debug load provides timestamps in the FSF
|
||||
* status qualifier. This might be specified later if being
|
||||
* useful for debugging aborts.
|
||||
*/
|
||||
dbf_fsf_qual[0] =
|
||||
*(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[0];
|
||||
dbf_fsf_qual[1] =
|
||||
*(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[2];
|
||||
zfcp_fsf_req_free(new_fsf_req);
|
||||
#else
|
||||
retval = zfcp_fsf_req_wait_and_cleanup(new_fsf_req,
|
||||
ZFCP_UNINTERRUPTIBLE, &status);
|
||||
#endif
|
||||
ZFCP_LOG_DEBUG("Waiting for cleanup complete, status=0x%x\n", status);
|
||||
|
||||
/* status should be valid since signals were not permitted */
|
||||
if (status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
|
||||
if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
|
||||
retval = SUCCESS;
|
||||
strncpy(dbf_result, "##succ", ZFCP_ABORT_DBF_LENGTH);
|
||||
} else if (status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
|
||||
} else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
|
||||
retval = SUCCESS;
|
||||
strncpy(dbf_result, "##late2", ZFCP_ABORT_DBF_LENGTH);
|
||||
} else {
|
||||
retval = FAILED;
|
||||
strncpy(dbf_result, "##fail", ZFCP_ABORT_DBF_LENGTH);
|
||||
}
|
||||
|
||||
out:
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_scsi_cmnd, sizeof (u64));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_opcode, ZFCP_ABORT_DBF_LENGTH);
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_wwn, sizeof (wwn_t));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_fcp_lun, sizeof (fcp_lun_t));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_retries, sizeof (u64));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_allowed, sizeof (u64));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_timeout, sizeof (u64));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_fsf_req, sizeof (u64));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_fsf_status, sizeof (u64));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[0], sizeof (u64));
|
||||
debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[1], sizeof (u64));
|
||||
debug_text_event(adapter->abort_dbf, 1, dbf_result);
|
||||
|
||||
spin_lock_irq(scsi_host->host_lock);
|
||||
return retval;
|
||||
}
|
||||
|
||||
int
|
||||
zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
|
||||
{
|
||||
int rc;
|
||||
struct Scsi_Host *scsi_host = scpnt->device->host;
|
||||
spin_lock_irq(scsi_host->host_lock);
|
||||
rc = __zfcp_scsi_eh_abort_handler(scpnt);
|
||||
spin_unlock_irq(scsi_host->host_lock);
|
||||
return rc;
|
||||
}
|
||||
|
||||
/*
|
||||
* function: zfcp_scsi_eh_device_reset_handler
|
||||
*
|
||||
|
|
|
|||
Loading…
Reference in a new issue