Edit File: scsi_transport.h
/* * Transport specific attributes. * * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef SCSI_TRANSPORT_H #define SCSI_TRANSPORT_H #include <linux/transport_class.h> #include <linux/blkdev.h> #include <linux/bug.h> #include <scsi/scsi_host.h> #include <scsi/scsi_device.h> struct scsi_transport_template { /* the attribute containers */ struct transport_container host_attrs; struct transport_container target_attrs; struct transport_container device_attrs; /* * If set, called from sysfs and legacy procfs rescanning code. */ int (*user_scan)(struct Scsi_Host *, uint, uint, uint); /* The size of the specific transport attribute structure (a * space of this size will be left at the end of the * scsi_* structure */ int device_size; int device_private_offset; int target_size; int target_private_offset; int host_size; /* no private offset for the host; there's an alternative mechanism */ /* * True if the transport wants to use a host-based work-queue */ unsigned int create_work_queue : 1; /* * Allows a transport to override the default error handler. */ void (* eh_strategy_handler)(struct Scsi_Host *); /* * This is an optional routine that allows the transport to become * involved when a scsi io timer fires. The return value tells the * timer routine how to finish the io timeout handling: * EH_HANDLED: I fixed the error, please complete the command * EH_RESET_TIMER: I need more time, reset the timer and * begin counting again * EH_NOT_HANDLED Begin normal error recovery */ enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); /* * Used as callback for the completion of i_t_nexus request * for target drivers. */ int (* it_nexus_response)(struct Scsi_Host *, u64, int); /* * Used as callback for the completion of task management * request for target drivers. */ int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int); }; #define transport_class_to_shost(tc) \ dev_to_shost((tc)->parent) /* Private area maintenance. The driver requested allocations come * directly after the transport class allocations (if any). The idea * is that you *must* call these only once. The code assumes that the * initial values are the ones the transport specific code requires */ static inline void scsi_transport_reserve_target(struct scsi_transport_template * t, int space) { BUG_ON(t->target_private_offset != 0); t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); t->target_size = t->target_private_offset + space; } static inline void scsi_transport_reserve_device(struct scsi_transport_template * t, int space) { BUG_ON(t->device_private_offset != 0); t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); t->device_size = t->device_private_offset + space; } static inline void * scsi_transport_target_data(struct scsi_target *starget) { struct Scsi_Host *shost = dev_to_shost(&starget->dev); return (u8 *)starget->starget_data + shost->transportt->target_private_offset; } static inline void * scsi_transport_device_data(struct scsi_device *sdev) { struct Scsi_Host *shost = sdev->host; return (u8 *)sdev->sdev_data + shost->transportt->device_private_offset; } #endif /* SCSI_TRANSPORT_H */