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scsi: reintroduce scsi_driver.init_command

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Instead of letting the ULD play games with the prep_fn move back to
the model of a central prep_fn with a callback to the ULD.  This
already cleans up and shortens the code by itself, and will be required
to properly support blk-mq in the SCSI midlayer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Christoph Hellwig
2014-05-01 16:51:04 +02:00
parent bc85dc500f
commit a1b73fc194
4 changed files with 62 additions and 76 deletions
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9
include/scsi/scsi_driver.h
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@@ -4,17 +4,17 @@
#include <linux/device.h>
struct module;
struct request;
struct scsi_cmnd;
struct scsi_device;
struct request;
struct request_queue;
struct scsi_driver {
struct module *owner;
struct device_driver gendrv;
void (*rescan)(struct device *);
int (*init_command)(struct scsi_cmnd *);
void (*uninit_command)(struct scsi_cmnd *);
int (*done)(struct scsi_cmnd *);
int (*eh_action)(struct scsi_cmnd *, int);
};
@@ -31,8 +31,5 @@ extern int scsi_register_interface(struct class_interface *);
int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req);
int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req);
int scsi_prep_state_check(struct scsi_device *sdev, struct request *req);
int scsi_prep_return(struct request_queue *q, struct request *req, int ret);
int scsi_prep_fn(struct request_queue *, struct request *);
#endif /* _SCSI_SCSI_DRIVER_H */