scsi_add_device - creates new scsi device (lu) instance
scsi_add_host - perform sysfs registration and set up transport class
scsi_adjust_queue_depth - change the queue depth on a SCSI device
- scsi_assign_lock - replace default host_lock with given lock
scsi_bios_ptable - return copy of block device's partition table
scsi_block_requests - prevent further commands being queued to given host
scsi_deactivate_tcq - turn off tag command queueing
int tags)
-/**
- * scsi_assign_lock - replace default host_lock with given lock
- * @shost: a pointer to a scsi host instance
- * @lock: pointer to lock to replace host_lock for this host
- *
- * Returns nothing
- *
- * Might block: no
- *
- * Defined in: include/scsi/scsi_host.h .
- **/
-void scsi_assign_lock(struct Scsi_Host *shost, spinlock_t *lock)
-
-
/**
* scsi_bios_ptable - return copy of block device's partition table
* @dev: pointer to block device
eh_bus_reset_handler - issue SCSI bus reset
eh_device_reset_handler - issue SCSI device reset
eh_host_reset_handler - reset host (host bus adapter)
- eh_strategy_handler - driver supplied alternate to scsi_unjam_host()
info - supply information about given host
ioctl - driver can respond to ioctls
proc_info - supports /proc/scsi/{driver_name}/{host_no}
int eh_host_reset_handler(struct scsi_cmnd * scp)
-/**
- * eh_strategy_handler - driver supplied alternate to scsi_unjam_host()
- * @shp: host on which error has occurred
- *
- * Returns TRUE if host unjammed, else FALSE.
- *
- * Locks: none
- *
- * Calling context: kernel thread
- *
- * Notes: Invoked from scsi_eh thread. LLD supplied alternate to
- * scsi_unjam_host() found in scsi_error.c
- *
- * Optionally defined in: LLD
- **/
- int eh_strategy_handler(struct Scsi_Host * shp)
-
-
/**
* info - supply information about given host: driver name plus data
* to distinguish given host
Each struct Scsi_Host instance has a spin_lock called struct
Scsi_Host::default_lock which is initialized in scsi_host_alloc() [found in
hosts.c]. Within the same function the struct Scsi_Host::host_lock pointer
-is initialized to point at default_lock with the scsi_assign_lock() function.
-Thereafter lock and unlock operations performed by the mid level use the
-struct Scsi_Host::host_lock pointer.
-
-LLDs can override the use of struct Scsi_Host::default_lock by
-using scsi_assign_lock(). The earliest opportunity to do this would
-be in the detect() function after it has invoked scsi_register(). It
-could be replaced by a coarser grain lock (e.g. per driver) or a
-lock of equal granularity (i.e. per host). Using finer grain locks
-(e.g. per SCSI device) may be possible by juggling locks in
-queuecommand().
+is initialized to point at default_lock. Thereafter lock and unlock
+operations performed by the mid level use the struct Scsi_Host::host_lock
+pointer. Previously drivers could override the host_lock pointer but
+this is not allowed anymore.
+
Autosense
=========
=======
The following people have contributed to this document:
Mike Anderson <andmike at us dot ibm dot com>
- James Bottomley <James dot Bottomley at steeleye dot com>
+ James Bottomley <James dot Bottomley at hansenpartnership dot com>
Patrick Mansfield <patmans at us dot ibm dot com>
Christoph Hellwig <hch at infradead dot org>
Doug Ledford <dledford at redhat dot com>