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[SCSI] scsi_error: Refactoring scsi_error to facilitate in synchronous REQUEST_SENSE

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- 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 <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Boaz Harrosh 2007-10-08 16:36:45 +02:00 • committed by James Bottomley
commit e1c234685c
2 changed files with 90 additions and 47 deletions
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23
include/scsi/scsi_eh.h
View file

@ -1,7 +1,7 @@
#ifndef _SCSI_SCSI_EH_H
#define _SCSI_SCSI_EH_H
struct scsi_cmnd;
#include <scsi/scsi_cmnd.h>
struct scsi_device;
struct Scsi_Host;
@ -65,4 +65,25 @@ extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
extern int scsi_reset_provider(struct scsi_device *, int);
struct scsi_eh_save {
int result;
enum dma_data_direction data_direction;
unsigned char cmd_len;
unsigned char cmnd[MAX_COMMAND_SIZE];
void *buffer;
unsigned bufflen;
unsigned short use_sg;
int resid;
struct scatterlist sense_sgl;
};
extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,
struct scsi_eh_save *ses, unsigned char *cmnd,
int cmnd_size, unsigned sense_bytes);
extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,
struct scsi_eh_save *ses);
#endif /* _SCSI_SCSI_EH_H */