[SCSI] scsi_error: Refactoring scsi_error to facilitate in synchronous REQUEST_SENSE
- Drivers/transports that want to send a synchronous REQUEST_SENSE command as part of their .queuecommand sequence, have 2 new API's that facilitate in doing so and abstract them from scsi-ml internals. void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *sesci, unsigned char *cmnd, int cmnd_size, int sense_bytes) Will hijack a command and prepare it for request sense if needed. And will save any later needed info into a scsi_eh_save structure. void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *sesci); Will undo any changes done to a command by above function. Making it ready for completion. - Re-factor scsi_send_eh_cmnd() to use above APIs Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Boaz Harrosh
James Bottomley
parent
55db6c1b8e
commit
e1c234685c
@ -590,42 +590,23 @@ static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd)
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}
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/**
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* scsi_send_eh_cmnd - submit a scsi command as part of error recory
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* scsi_eh_prep_cmnd - Save a scsi command info as part of error recory
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* @scmd: SCSI command structure to hijack
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* @ses: structure to save restore information
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* @cmnd: CDB to send. Can be NULL if no new cmnd is needed
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* @cmnd_size: size in bytes of @cmnd
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* @timeout: timeout for this request
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* @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
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*
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* This function is used to send a scsi command down to a target device
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* This function is used to save a scsi command information before re-execution
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* as part of the error recovery process. If @sense_bytes is 0 the command
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* sent must be one that does not transfer any data. If @sense_bytes != 0
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* @cmnd is ignored and this functions sets up a REQUEST_SENSE command
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* and cmnd buffers to read @sense_bytes into @scmd->sense_buffer.
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*
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* Return value:
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* SUCCESS or FAILED or NEEDS_RETRY
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**/
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static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
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int cmnd_size, int timeout, unsigned sense_bytes)
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void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
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unsigned char *cmnd, int cmnd_size, unsigned sense_bytes)
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{
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struct scsi_device *sdev = scmd->device;
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struct Scsi_Host *shost = sdev->host;
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DECLARE_COMPLETION_ONSTACK(done);
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unsigned long timeleft;
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unsigned long flags;
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unsigned char old_cmd_len;
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unsigned char old_cmnd[MAX_COMMAND_SIZE];
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enum dma_data_direction old_data_direction;
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unsigned old_bufflen;
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void *old_buffer;
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unsigned short old_use_sg;
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int old_resid;
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int old_result;
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struct scatterlist sgl;
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int rtn;
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/*
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* We need saved copies of a number of fields - this is because
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@ -634,20 +615,21 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
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* we will need to restore these values prior to running the actual
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* command.
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*/
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old_cmd_len = scmd->cmd_len;
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memcpy(old_cmnd, scmd->cmnd, sizeof(scmd->cmnd));
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old_data_direction = scmd->sc_data_direction;
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old_bufflen = scmd->request_bufflen;
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old_buffer = scmd->request_buffer;
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old_use_sg = scmd->use_sg;
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old_resid = scmd->resid;
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old_result = scmd->result;
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ses->cmd_len = scmd->cmd_len;
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memcpy(ses->cmnd, scmd->cmnd, sizeof(scmd->cmnd));
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ses->data_direction = scmd->sc_data_direction;
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ses->bufflen = scmd->request_bufflen;
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ses->buffer = scmd->request_buffer;
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ses->use_sg = scmd->use_sg;
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ses->resid = scmd->resid;
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ses->result = scmd->result;
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if (sense_bytes) {
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scmd->request_bufflen = min_t(unsigned,
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sizeof(scmd->sense_buffer), sense_bytes);
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sg_init_one(&sgl, scmd->sense_buffer, scmd->request_bufflen);
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scmd->request_buffer = &sgl;
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sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
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scmd->request_bufflen);
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scmd->request_buffer = &ses->sense_sgl;
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scmd->sc_data_direction = DMA_FROM_DEVICE;
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scmd->use_sg = 1;
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memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
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@ -677,7 +659,58 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
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* untransferred sense data should be interpreted as being zero.
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*/
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memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
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}
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EXPORT_SYMBOL(scsi_eh_prep_cmnd);
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/**
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* scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory
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* @scmd: SCSI command structure to restore
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* @ses: saved information from a coresponding call to scsi_prep_eh_cmnd
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*
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* Undo any damage done by above scsi_prep_eh_cmnd().
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**/
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void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
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{
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/*
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* Restore original data
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*/
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scmd->cmd_len = ses->cmd_len;
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memcpy(scmd->cmnd, ses->cmnd, sizeof(scmd->cmnd));
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scmd->sc_data_direction = ses->data_direction;
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scmd->request_bufflen = ses->bufflen;
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scmd->request_buffer = ses->buffer;
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scmd->use_sg = ses->use_sg;
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scmd->resid = ses->resid;
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scmd->result = ses->result;
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}
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EXPORT_SYMBOL(scsi_eh_restore_cmnd);
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/**
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* scsi_send_eh_cmnd - submit a scsi command as part of error recory
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* @scmd: SCSI command structure to hijack
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* @cmnd: CDB to send
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* @cmnd_size: size in bytes of @cmnd
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* @timeout: timeout for this request
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* @sense_bytes: size of sense data to copy or 0
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*
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* This function is used to send a scsi command down to a target device
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* as part of the error recovery process. See also scsi_eh_prep_cmnd() above.
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*
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* Return value:
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* SUCCESS or FAILED or NEEDS_RETRY
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**/
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static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
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int cmnd_size, int timeout, unsigned sense_bytes)
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{
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struct scsi_device *sdev = scmd->device;
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struct Scsi_Host *shost = sdev->host;
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DECLARE_COMPLETION_ONSTACK(done);
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unsigned long timeleft;
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unsigned long flags;
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struct scsi_eh_save ses;
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int rtn;
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scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes);
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shost->eh_action = &done;
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spin_lock_irqsave(shost->host_lock, flags);
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@ -721,18 +754,7 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
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rtn = FAILED;
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}
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/*
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* Restore original data
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*/
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scmd->cmd_len = old_cmd_len;
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memcpy(scmd->cmnd, old_cmnd, sizeof(scmd->cmnd));
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scmd->sc_data_direction = old_data_direction;
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scmd->request_bufflen = old_bufflen;
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scmd->request_buffer = old_buffer;
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scmd->use_sg = old_use_sg;
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scmd->resid = old_resid;
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scmd->result = old_result;
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scsi_eh_restore_cmnd(scmd, &ses);
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return rtn;
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}
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@ -1,7 +1,7 @@
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#ifndef _SCSI_SCSI_EH_H
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#define _SCSI_SCSI_EH_H
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struct scsi_cmnd;
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#include <scsi/scsi_cmnd.h>
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struct scsi_device;
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struct Scsi_Host;
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@ -65,4 +65,25 @@ extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
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extern int scsi_reset_provider(struct scsi_device *, int);
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struct scsi_eh_save {
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int result;
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enum dma_data_direction data_direction;
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unsigned char cmd_len;
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unsigned char cmnd[MAX_COMMAND_SIZE];
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void *buffer;
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unsigned bufflen;
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unsigned short use_sg;
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int resid;
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struct scatterlist sense_sgl;
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};
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extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,
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struct scsi_eh_save *ses, unsigned char *cmnd,
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int cmnd_size, unsigned sense_bytes);
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extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,
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struct scsi_eh_save *ses);
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#endif /* _SCSI_SCSI_EH_H */
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