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[SCSI] Small cleanups for scsi_host.h

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Small cleanups in scsi_host.h. Few #defines make me wonder if their
description is still up to date..?

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Pavel Machek 2008-02-04 23:53:24 -08:00 committed by James Bottomley
parent 8144f2137b
commit d850bd34f5
1 changed files with 25 additions and 19 deletions
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44
include/scsi/scsi_host.h
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@ -280,39 +280,45 @@ struct scsi_host_template {
* If the host wants to be called before the scan starts, but
* after the midlayer has set up ready for the scan, it can fill
* in this function.
*
* Status: OPTIONAL
*/
void (* scan_start)(struct Scsi_Host *);
/*
* fill in this function to allow the queue depth of this host
* to be changeable (on a per device basis). returns either
* Fill in this function to allow the queue depth of this host
* to be changeable (on a per device basis). Returns either
* the current queue depth setting (may be different from what
* was passed in) or an error. An error should only be
* returned if the requested depth is legal but the driver was
* unable to set it. If the requested depth is illegal, the
* driver should set and return the closest legal queue depth.
*
* Status: OPTIONAL
*/
int (* change_queue_depth)(struct scsi_device *, int);
/*
* fill in this function to allow the changing of tag types
* Fill in this function to allow the changing of tag types
* (this also allows the enabling/disabling of tag command
* queueing). An error should only be returned if something
* went wrong in the driver while trying to set the tag type.
* If the driver doesn't support the requested tag type, then
* it should set the closest type it does support without
* returning an error. Returns the actual tag type set.
*
* Status: OPTIONAL
*/
int (* change_queue_type)(struct scsi_device *, int);
/*
* This function determines the bios parameters for a given
* This function determines the BIOS parameters for a given
* harddisk. These tend to be numbers that are made up by
* the host adapter. Parameters:
* size, device, list (heads, sectors, cylinders)
*
* Status: OPTIONAL */
* Status: OPTIONAL
*/
int (* bios_param)(struct scsi_device *, struct block_device *,
sector_t, int []);
@ -351,7 +357,7 @@ struct scsi_host_template {
/*
* This determines if we will use a non-interrupt driven
* or an interrupt driven scheme, It is set to the maximum number
* or an interrupt driven scheme. It is set to the maximum number
* of simultaneous commands a given host adapter will accept.
*/
int can_queue;
@ -372,12 +378,12 @@ struct scsi_host_template {
unsigned short sg_tablesize;
/*
* If the host adapter has limitations beside segment count
* Set this if the host adapter has limitations beside segment count.
*/
unsigned short max_sectors;
/*
* dma scatter gather segment boundary limit. a segment crossing this
* DMA scatter gather segment boundary limit. A segment crossing this
* boundary will be split in two.
*/
unsigned long dma_boundary;
@ -386,7 +392,7 @@ struct scsi_host_template {
* This specifies "machine infinity" for host templates which don't
* limit the transfer size. Note this limit represents an absolute
* maximum, and may be over the transfer limits allowed for
* individual devices (e.g. 256 for SCSI-1)
* individual devices (e.g. 256 for SCSI-1).
*/
#define SCSI_DEFAULT_MAX_SECTORS 1024
@ -413,12 +419,12 @@ struct scsi_host_template {
unsigned supported_mode:2;
/*
* true if this host adapter uses unchecked DMA onto an ISA bus.
* True if this host adapter uses unchecked DMA onto an ISA bus.
*/
unsigned unchecked_isa_dma:1;
/*
* true if this host adapter can make good use of clustering.
* True if this host adapter can make good use of clustering.
* I originally thought that if the tablesize was large that it
* was a waste of CPU cycles to prepare a cluster list, but
* it works out that the Buslogic is faster if you use a smaller
@ -428,7 +434,7 @@ struct scsi_host_template {
unsigned use_clustering:1;
/*
* True for emulated SCSI host adapters (e.g. ATAPI)
* True for emulated SCSI host adapters (e.g. ATAPI).
*/
unsigned emulated:1;
@ -438,12 +444,12 @@ struct scsi_host_template {
unsigned skip_settle_delay:1;
/*
* ordered write support
* True if we are using ordered write support.
*/
unsigned ordered_tag:1;
/*
* Countdown for host blocking with no commands outstanding
* Countdown for host blocking with no commands outstanding.
*/
unsigned int max_host_blocked;
@ -522,8 +528,8 @@ struct Scsi_Host {
struct scsi_transport_template *transportt;
/*
* area to keep a shared tag map (if needed, will be
* NULL if not)
* Area to keep a shared tag map (if needed, will be
* NULL if not).
*/
struct blk_queue_tag *bqt;
@ -596,16 +602,16 @@ struct Scsi_Host {
/*
* Host uses correct SCSI ordering not PC ordering. The bit is
* set for the minority of drivers whose authors actually read
* the spec ;)
* the spec ;).
*/
unsigned reverse_ordering:1;
/*
* ordered write support
* Ordered write support
*/
unsigned ordered_tag:1;
/* task mgmt function in progress */
/* Task mgmt function in progress */
unsigned tmf_in_progress:1;
/* Asynchronous scan in progress */