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