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[SCSI] introduce sfoo_printk, sfoo_id, sfoo_channel helpers

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New dev_printk wrappers, which allow us to shrink code, and
eliminate direct references to host/channel/id/lun members:
	scmd_printk()

Introduce wrappers for highly common idioms, which may also help us
eliminate some ->{channel,id} references in the future:
	{scmd,sdev}_id()
	{scmd,sdev}_channel()

The scmd_* wrappers are present in scsi/scsi_device.h because they all
employ the dereference chain cmd->device->$member.  We would prefer to
use static inline functions rather than macros, but that would have a

Rejections fixed up and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Jeff Garzik 2005-10-24 18:03:34 -04:00 committed by James Bottomley
parent 13ec92b33e
commit 01d7b3b8d0
1 changed files with 16 additions and 0 deletions
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16
include/scsi/scsi_device.h
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@ -151,6 +151,9 @@ struct scsi_device {
#define sdev_printk(prefix, sdev, fmt, a...) \
dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
#define scmd_printk(prefix, scmd, fmt, a...) \
dev_printk(prefix, &(scmd)->device->sdev_gendev, fmt, ##a)
/*
* scsi_target: representation of a scsi target, for now, this is only
* used for single_lun devices. If no one has active IO to the target,
@ -272,6 +275,19 @@ extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
int data_direction, void *buffer, unsigned bufflen,
struct scsi_sense_hdr *, int timeout, int retries);
static inline unsigned int sdev_channel(struct scsi_device *sdev)
{
return sdev->channel;
}
static inline unsigned int sdev_id(struct scsi_device *sdev)
{
return sdev->id;
}
#define scmd_id(scmd) sdev_id((scmd)->device)
#define scmd_channel(scmd) sdev_channel((scmd)->device)
static inline int scsi_device_online(struct scsi_device *sdev)
{
return sdev->sdev_state != SDEV_OFFLINE;