178 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
179 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
181 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
184 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
187 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
188 static void sg_build_reserve(Sg_fd * sfp, int req_size);
189 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
190 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
193 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
194 static Sg_request *sg_add_request(Sg_fd * sfp);
195 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
236 	struct sg_fd *sfp = filp->private_data;  in sg_allow_access()  local
238 	if (sfp->parentdp->device->type == TYPE_SCANNER)  in sg_allow_access()
289 	Sg_fd *sfp;  in sg_open()  local
350 	sfp = sg_add_sfp(sdp);  in sg_open()
351 	if (IS_ERR(sfp)) {  in sg_open()
352 		retval = PTR_ERR(sfp);  in sg_open()
356 	filp->private_data = sfp;  in sg_open()
385 	Sg_fd *sfp;  in sg_release()  local
387 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_release()
393 	kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_release()
444 	Sg_fd *sfp;  in sg_read()  local
459 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_read()
464 	if (sfp->force_packid)  in sg_read()
469 	srp = sg_get_rq_mark(sfp, req_pack_id);  in sg_read()
475 		retval = wait_event_interruptible(sfp->read_wait,  in sg_read()
477 			(srp = sg_get_rq_mark(sfp, req_pack_id))));  in sg_read()
485 		return sg_new_read(sfp, buf, count, srp);  in sg_read()
553 	sg_remove_request(sfp, srp);  in sg_read()
561 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)  in sg_new_read()  argument
597 	sg_remove_request(sfp, srp);  in sg_new_read()
608 	Sg_fd *sfp;  in sg_write()  local
619 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_write()
635 		return sg_new_write(sfp, filp, buf, count,  in sg_write()
644 	if (!(srp = sg_add_request(sfp))) {  in sg_write()
649 	mutex_lock(&sfp->f_mutex);  in sg_write()
650 	if (sfp->next_cmd_len > 0) {  in sg_write()
651 		cmd_size = sfp->next_cmd_len;  in sg_write()
652 		sfp->next_cmd_len = 0;	/* reset so only this write() effected */  in sg_write()
658 	mutex_unlock(&sfp->f_mutex);  in sg_write()
667 		sg_remove_request(sfp, srp);  in sg_write()
692 		sg_remove_request(sfp, srp);  in sg_write()
710 	k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);  in sg_write()
715 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,  in sg_new_write()  argument
729 	sfp->cmd_q = 1;	/* when sg_io_hdr seen, set command queuing on */  in sg_new_write()
730 	if (!(srp = sg_add_request(sfp))) {  in sg_new_write()
731 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_new_write()
738 		sg_remove_request(sfp, srp);  in sg_new_write()
742 		sg_remove_request(sfp, srp);  in sg_new_write()
746 		if (hp->dxfer_len > sfp->reserve.bufflen) {  in sg_new_write()
747 			sg_remove_request(sfp, srp);  in sg_new_write()
751 			sg_remove_request(sfp, srp);  in sg_new_write()
754 		if (sfp->res_in_use) {  in sg_new_write()
755 			sg_remove_request(sfp, srp);  in sg_new_write()
762 		sg_remove_request(sfp, srp);  in sg_new_write()
766 		sg_remove_request(sfp, srp);  in sg_new_write()
770 		sg_remove_request(sfp, srp);  in sg_new_write()
773 	k = sg_common_write(sfp, srp, cmnd, timeout, blocking);  in sg_new_write()
782 sg_common_write(Sg_fd * sfp, Sg_request * srp,  in sg_common_write()  argument
786 	Sg_device *sdp = sfp->parentdp;  in sg_common_write()
797 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_common_write()
802 		sg_remove_request(sfp, srp);  in sg_common_write()
808 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_common_write()
811 		sg_remove_request(sfp, srp);  in sg_common_write()
822 		sg_remove_request(sfp, srp);  in sg_common_write()
834 	kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */  in sg_common_write()
839 static int srp_done(Sg_fd *sfp, Sg_request *srp)  in srp_done()  argument
844 	read_lock_irqsave(&sfp->rq_list_lock, flags);  in srp_done()
846 	read_unlock_irqrestore(&sfp->rq_list_lock, flags);  in srp_done()
860 sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo)  in sg_fill_request_table()  argument
867 	list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_fill_request_table()
920 sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp,  in sg_ioctl_common()  argument
938 		result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,  in sg_ioctl_common()
942 		result = wait_event_interruptible(sfp->read_wait,  in sg_ioctl_common()
943 			(srp_done(sfp, srp) || atomic_read(&sdp->detaching)));  in sg_ioctl_common()
946 		write_lock_irq(&sfp->rq_list_lock);  in sg_ioctl_common()
949 			write_unlock_irq(&sfp->rq_list_lock);  in sg_ioctl_common()
950 			result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);  in sg_ioctl_common()
954 		write_unlock_irq(&sfp->rq_list_lock);  in sg_ioctl_common()
965 		sfp->timeout_user = val;  in sg_ioctl_common()
966 		sfp->timeout = mult_frac(val, HZ, USER_HZ);  in sg_ioctl_common()
971 		return sfp->timeout_user;  in sg_ioctl_common()
1003 		sfp->force_packid = val ? 1 : 0;  in sg_ioctl_common()
1006 		read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl_common()
1007 		list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_ioctl_common()
1009 				read_unlock_irqrestore(&sfp->rq_list_lock,  in sg_ioctl_common()
1014 		read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl_common()
1017 		read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl_common()
1019 		list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_ioctl_common()
1023 		read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl_common()
1035 		mutex_lock(&sfp->f_mutex);  in sg_ioctl_common()
1036 		if (val != sfp->reserve.bufflen) {  in sg_ioctl_common()
1037 			if (sfp->mmap_called ||  in sg_ioctl_common()
1038 			    sfp->res_in_use) {  in sg_ioctl_common()
1039 				mutex_unlock(&sfp->f_mutex);  in sg_ioctl_common()
1043 			sg_remove_scat(sfp, &sfp->reserve);  in sg_ioctl_common()
1044 			sg_build_reserve(sfp, val);  in sg_ioctl_common()
1046 		mutex_unlock(&sfp->f_mutex);  in sg_ioctl_common()
1049 		val = min_t(int, sfp->reserve.bufflen,  in sg_ioctl_common()
1056 		sfp->cmd_q = val ? 1 : 0;  in sg_ioctl_common()
1059 		return put_user((int) sfp->cmd_q, ip);  in sg_ioctl_common()
1064 		sfp->keep_orphan = val;  in sg_ioctl_common()
1067 		return put_user((int) sfp->keep_orphan, ip);  in sg_ioctl_common()
1074 		sfp->next_cmd_len = (val > 0) ? val : 0;  in sg_ioctl_common()
1090 			read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl_common()
1091 			sg_fill_request_table(sfp, rinfo);  in sg_ioctl_common()
1092 			read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl_common()
1158 	Sg_fd *sfp;  in sg_ioctl()  local
1161 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_ioctl()
1164 	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);  in sg_ioctl()
1175 	Sg_fd *sfp;  in sg_poll()  local
1180 	sfp = filp->private_data;  in sg_poll()
1181 	if (!sfp)  in sg_poll()
1183 	sdp = sfp->parentdp;  in sg_poll()
1186 	poll_wait(filp, &sfp->read_wait, wait);  in sg_poll()
1187 	read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_poll()
1188 	list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_poll()
1194 	read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_poll()
1198 	else if (!sfp->cmd_q) {  in sg_poll()
1212 	Sg_fd *sfp;  in sg_fasync()  local
1214 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_fasync()
1219 	return fasync_helper(fd, filp, mode, &sfp->async_qp);  in sg_fasync()
1226 	Sg_fd *sfp;  in sg_vma_fault()  local
1231 	if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))  in sg_vma_fault()
1233 	rsv_schp = &sfp->reserve;  in sg_vma_fault()
1237 	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,  in sg_vma_fault()
1266 	Sg_fd *sfp;  in sg_mmap()  local
1272 	if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))  in sg_mmap()
1275 	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,  in sg_mmap()
1280 	rsv_schp = &sfp->reserve;  in sg_mmap()
1281 	mutex_lock(&sfp->f_mutex);  in sg_mmap()
1295 	sfp->mmap_called = 1;  in sg_mmap()
1297 	vma->vm_private_data = sfp;  in sg_mmap()
1300 	mutex_unlock(&sfp->f_mutex);  in sg_mmap()
1308 	struct sg_fd *sfp = srp->parentfp;  in sg_rq_end_io_usercontext()  local
1311 	sg_remove_request(sfp, srp);  in sg_rq_end_io_usercontext()
1312 	kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_rq_end_io_usercontext()
1325 	Sg_fd *sfp;  in sg_rq_end_io()  local
1334 	sfp = srp->parentfp;  in sg_rq_end_io()
1335 	if (WARN_ON(sfp == NULL))  in sg_rq_end_io()
1338 	sdp = sfp->parentdp;  in sg_rq_end_io()
1394 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_rq_end_io()
1396 		if (sfp->keep_orphan)  in sg_rq_end_io()
1402 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_rq_end_io()
1408 		wake_up_interruptible(&sfp->read_wait);  in sg_rq_end_io()
1409 		kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);  in sg_rq_end_io()
1410 		kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_rq_end_io()
1591 	Sg_fd *sfp;  in sg_remove_device()  local
1605 	list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {  in sg_remove_device()
1606 		wake_up_interruptible_all(&sfp->read_wait);  in sg_remove_device()
1607 		kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);  in sg_remove_device()
1693 	Sg_fd *sfp = srp->parentfp;  in sg_start_req()  local
1699 	Sg_scatter_hold *rsv_schp = &sfp->reserve;  in sg_start_req()
1700 	struct request_queue *q = sfp->parentdp->device->request_queue;  in sg_start_req()
1705 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_start_req()
1754 		mutex_lock(&sfp->f_mutex);  in sg_start_req()
1756 		    !sfp->res_in_use) {  in sg_start_req()
1757 			sfp->res_in_use = 1;  in sg_start_req()
1758 			sg_link_reserve(sfp, srp, dxfer_len);  in sg_start_req()
1760 			res = -EBUSY; /* sfp->res_in_use == 1 */  in sg_start_req()
1763 			mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1766 			res = sg_build_indirect(req_schp, sfp, dxfer_len);  in sg_start_req()
1768 				mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1772 		mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1821 	Sg_fd *sfp = srp->parentfp;  in sg_finish_rem_req()  local
1824 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_finish_rem_req()
1836 		sg_unlink_reserve(sfp, srp);  in sg_finish_rem_req()
1838 		sg_remove_scat(sfp, req_schp);  in sg_finish_rem_req()
1844 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)  in sg_build_sgat()  argument
1857 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)  in sg_build_indirect()  argument
1860 	int sg_tablesize = sfp->parentdp->sg_tablesize;  in sg_build_indirect()
1870 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1875 	mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);  in sg_build_indirect()
1909 		SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1916 	SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1935 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)  in sg_remove_scat()  argument
1937 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_remove_scat()
1945 					sg_printk(KERN_INFO, sfp->parentdp,  in sg_remove_scat()
1991 sg_build_reserve(Sg_fd * sfp, int req_size)  in sg_build_reserve()  argument
1993 	Sg_scatter_hold *schp = &sfp->reserve;  in sg_build_reserve()
1995 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_reserve()
2000 		if (0 == sg_build_indirect(schp, sfp, req_size))  in sg_build_reserve()
2003 			sg_remove_scat(sfp, schp);  in sg_build_reserve()
2009 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)  in sg_link_reserve()  argument
2012 	Sg_scatter_hold *rsv_schp = &sfp->reserve;  in sg_link_reserve()
2016 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_link_reserve()
2035 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_link_reserve()
2040 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)  in sg_unlink_reserve()  argument
2054 	sfp->res_in_use = 0;  in sg_unlink_reserve()
2058 sg_get_rq_mark(Sg_fd * sfp, int pack_id)  in sg_get_rq_mark()  argument
2063 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2064 	list_for_each_entry(resp, &sfp->rq_list, entry) {  in sg_get_rq_mark()
2069 			write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2073 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2079 sg_add_request(Sg_fd * sfp)  in sg_add_request()  argument
2083 	Sg_request *rp = sfp->req_arr;  in sg_add_request()
2085 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_add_request()
2086 	if (!list_empty(&sfp->rq_list)) {  in sg_add_request()
2087 		if (!sfp->cmd_q)  in sg_add_request()
2098 	rp->parentfp = sfp;  in sg_add_request()
2100 	list_add_tail(&rp->entry, &sfp->rq_list);  in sg_add_request()
2101 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_add_request()
2104 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_add_request()
2110 sg_remove_request(Sg_fd * sfp, Sg_request * srp)  in sg_remove_request()  argument
2115 	if (!sfp || !srp || list_empty(&sfp->rq_list))  in sg_remove_request()
2117 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_remove_request()
2123 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_remove_request()
2130 	Sg_fd *sfp;  in sg_add_sfp()  local
2134 	sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);  in sg_add_sfp()
2135 	if (!sfp)  in sg_add_sfp()
2138 	init_waitqueue_head(&sfp->read_wait);  in sg_add_sfp()
2139 	rwlock_init(&sfp->rq_list_lock);  in sg_add_sfp()
2140 	INIT_LIST_HEAD(&sfp->rq_list);  in sg_add_sfp()
2141 	kref_init(&sfp->f_ref);  in sg_add_sfp()
2142 	mutex_init(&sfp->f_mutex);  in sg_add_sfp()
2143 	sfp->timeout = SG_DEFAULT_TIMEOUT;  in sg_add_sfp()
2144 	sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;  in sg_add_sfp()
2145 	sfp->force_packid = SG_DEF_FORCE_PACK_ID;  in sg_add_sfp()
2146 	sfp->cmd_q = SG_DEF_COMMAND_Q;  in sg_add_sfp()
2147 	sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;  in sg_add_sfp()
2148 	sfp->parentdp = sdp;  in sg_add_sfp()
2152 		kfree(sfp);  in sg_add_sfp()
2155 	list_add_tail(&sfp->sfd_siblings, &sdp->sfds);  in sg_add_sfp()
2158 				      "sg_add_sfp: sfp=0x%p\n", sfp));  in sg_add_sfp()
2164 	sg_build_reserve(sfp, bufflen);  in sg_add_sfp()
2167 				      sfp->reserve.bufflen,  in sg_add_sfp()
2168 				      sfp->reserve.k_use_sg));  in sg_add_sfp()
2172 	return sfp;  in sg_add_sfp()
2178 	struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);  in sg_remove_sfp_usercontext()  local
2179 	struct sg_device *sdp = sfp->parentdp;  in sg_remove_sfp_usercontext()
2184 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_remove_sfp_usercontext()
2185 	while (!list_empty(&sfp->rq_list)) {  in sg_remove_sfp_usercontext()
2186 		srp = list_first_entry(&sfp->rq_list, Sg_request, entry);  in sg_remove_sfp_usercontext()
2191 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_remove_sfp_usercontext()
2193 	if (sfp->reserve.bufflen > 0) {  in sg_remove_sfp_usercontext()
2196 				(int) sfp->reserve.bufflen,  in sg_remove_sfp_usercontext()
2197 				(int) sfp->reserve.k_use_sg));  in sg_remove_sfp_usercontext()
2198 		sg_remove_scat(sfp, &sfp->reserve);  in sg_remove_sfp_usercontext()
2202 			"sg_remove_sfp: sfp=0x%p\n", sfp));  in sg_remove_sfp_usercontext()
2203 	kfree(sfp);  in sg_remove_sfp_usercontext()
2213 	struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);  in sg_remove_sfp()  local
2214 	struct sg_device *sdp = sfp->parentdp;  in sg_remove_sfp()
2218 	list_del(&sfp->sfd_siblings);  in sg_remove_sfp()
2221 	INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);  in sg_remove_sfp()
2222 	schedule_work(&sfp->ew.work);  in sg_remove_sfp()