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);
237 	struct sg_fd *sfp = filp->private_data;  in sg_allow_access()  local
239 	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()
412 	Sg_fd *sfp;  in sg_read()  local
427 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_read()
434 	if (sfp->force_packid && (count >= SZ_SG_HEADER)) {  in sg_read()
462 	srp = sg_get_rq_mark(sfp, req_pack_id);  in sg_read()
472 		retval = wait_event_interruptible(sfp->read_wait,  in sg_read()
474 			(srp = sg_get_rq_mark(sfp, req_pack_id))));  in sg_read()
485 		retval = sg_new_read(sfp, buf, count, srp);  in sg_read()
557 	sg_remove_request(sfp, srp);  in sg_read()
565 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)  in sg_new_read()  argument
598 	sg_remove_request(sfp, srp);  in sg_new_read()
609 	Sg_fd *sfp;  in sg_write()  local
620 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_write()
638 		return sg_new_write(sfp, filp, buf, count,  in sg_write()
643 	if (!(srp = sg_add_request(sfp))) {  in sg_write()
650 	mutex_lock(&sfp->f_mutex);  in sg_write()
651 	if (sfp->next_cmd_len > 0) {  in sg_write()
652 		cmd_size = sfp->next_cmd_len;  in sg_write()
653 		sfp->next_cmd_len = 0;	/* reset so only this write() effected */  in sg_write()
659 	mutex_unlock(&sfp->f_mutex);  in sg_write()
668 		sg_remove_request(sfp, srp);  in sg_write()
709 	k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);  in sg_write()
714 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,  in sg_new_write()  argument
730 	sfp->cmd_q = 1;	/* when sg_io_hdr seen, set command queuing on */  in sg_new_write()
731 	if (!(srp = sg_add_request(sfp))) {  in sg_new_write()
732 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_new_write()
739 		sg_remove_request(sfp, srp);  in sg_new_write()
743 		sg_remove_request(sfp, srp);  in sg_new_write()
747 		if (hp->dxfer_len > sfp->reserve.bufflen) {  in sg_new_write()
748 			sg_remove_request(sfp, srp);  in sg_new_write()
752 			sg_remove_request(sfp, srp);  in sg_new_write()
755 		if (sfp->res_in_use) {  in sg_new_write()
756 			sg_remove_request(sfp, srp);  in sg_new_write()
763 		sg_remove_request(sfp, srp);  in sg_new_write()
767 		sg_remove_request(sfp, srp);  in sg_new_write()
771 		sg_remove_request(sfp, srp);  in sg_new_write()
775 		sg_remove_request(sfp, srp);  in sg_new_write()
778 	k = sg_common_write(sfp, srp, cmnd, timeout, blocking);  in sg_new_write()
787 sg_common_write(Sg_fd * sfp, Sg_request * srp,  in sg_common_write()  argument
791 	Sg_device *sdp = sfp->parentdp;  in sg_common_write()
802 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_common_write()
811 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_common_write()
814 		sg_remove_request(sfp, srp);  in sg_common_write()
825 		sg_remove_request(sfp, srp);  in sg_common_write()
837 	kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */  in sg_common_write()
843 static int srp_done(Sg_fd *sfp, Sg_request *srp)  in srp_done()  argument
848 	read_lock_irqsave(&sfp->rq_list_lock, flags);  in srp_done()
850 	read_unlock_irqrestore(&sfp->rq_list_lock, flags);  in srp_done()
864 sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo)  in sg_fill_request_table()  argument
871 	list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_fill_request_table()
903 	Sg_fd *sfp;  in sg_ioctl()  local
907 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_ioctl()
922 		result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,  in sg_ioctl()
926 		result = wait_event_interruptible(sfp->read_wait,  in sg_ioctl()
927 			(srp_done(sfp, srp) || atomic_read(&sdp->detaching)));  in sg_ioctl()
930 		write_lock_irq(&sfp->rq_list_lock);  in sg_ioctl()
933 			write_unlock_irq(&sfp->rq_list_lock);  in sg_ioctl()
934 			result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);  in sg_ioctl()
938 		write_unlock_irq(&sfp->rq_list_lock);  in sg_ioctl()
949 		sfp->timeout_user = val;  in sg_ioctl()
950 		sfp->timeout = mult_frac(val, HZ, USER_HZ);  in sg_ioctl()
955 		return sfp->timeout_user;  in sg_ioctl()
992 		sfp->force_packid = val ? 1 : 0;  in sg_ioctl()
997 		read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl()
998 		list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_ioctl()
1000 				read_unlock_irqrestore(&sfp->rq_list_lock,  in sg_ioctl()
1006 		read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1010 		read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1012 		list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_ioctl()
1016 		read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1028 		mutex_lock(&sfp->f_mutex);  in sg_ioctl()
1029 		if (val != sfp->reserve.bufflen) {  in sg_ioctl()
1030 			if (sfp->mmap_called ||  in sg_ioctl()
1031 			    sfp->res_in_use) {  in sg_ioctl()
1032 				mutex_unlock(&sfp->f_mutex);  in sg_ioctl()
1036 			sg_remove_scat(sfp, &sfp->reserve);  in sg_ioctl()
1037 			sg_build_reserve(sfp, val);  in sg_ioctl()
1039 		mutex_unlock(&sfp->f_mutex);  in sg_ioctl()
1042 		val = min_t(int, sfp->reserve.bufflen,  in sg_ioctl()
1049 		sfp->cmd_q = val ? 1 : 0;  in sg_ioctl()
1052 		return put_user((int) sfp->cmd_q, ip);  in sg_ioctl()
1057 		sfp->keep_orphan = val;  in sg_ioctl()
1060 		return put_user((int) sfp->keep_orphan, ip);  in sg_ioctl()
1067 		sfp->next_cmd_len = (val > 0) ? val : 0;  in sg_ioctl()
1085 			read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1086 			sg_fill_request_table(sfp, rinfo);  in sg_ioctl()
1087 			read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1147 	Sg_fd *sfp;  in sg_compat_ioctl()  local
1150 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_compat_ioctl()
1171 	Sg_fd *sfp;  in sg_poll()  local
1176 	sfp = filp->private_data;  in sg_poll()
1177 	if (!sfp)  in sg_poll()
1179 	sdp = sfp->parentdp;  in sg_poll()
1182 	poll_wait(filp, &sfp->read_wait, wait);  in sg_poll()
1183 	read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_poll()
1184 	list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_poll()
1190 	read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_poll()
1194 	else if (!sfp->cmd_q) {  in sg_poll()
1208 	Sg_fd *sfp;  in sg_fasync()  local
1210 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_fasync()
1215 	return fasync_helper(fd, filp, mode, &sfp->async_qp);  in sg_fasync()
1222 	Sg_fd *sfp;  in sg_vma_fault()  local
1227 	if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))  in sg_vma_fault()
1229 	rsv_schp = &sfp->reserve;  in sg_vma_fault()
1233 	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,  in sg_vma_fault()
1262 	Sg_fd *sfp;  in sg_mmap()  local
1268 	if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))  in sg_mmap()
1271 	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,  in sg_mmap()
1276 	rsv_schp = &sfp->reserve;  in sg_mmap()
1277 	mutex_lock(&sfp->f_mutex);  in sg_mmap()
1291 	sfp->mmap_called = 1;  in sg_mmap()
1293 	vma->vm_private_data = sfp;  in sg_mmap()
1296 	mutex_unlock(&sfp->f_mutex);  in sg_mmap()
1304 	struct sg_fd *sfp = srp->parentfp;  in sg_rq_end_io_usercontext()  local
1307 	sg_remove_request(sfp, srp);  in sg_rq_end_io_usercontext()
1308 	kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_rq_end_io_usercontext()
1321 	Sg_fd *sfp;  in sg_rq_end_io()  local
1330 	sfp = srp->parentfp;  in sg_rq_end_io()
1331 	if (WARN_ON(sfp == NULL))  in sg_rq_end_io()
1334 	sdp = sfp->parentdp;  in sg_rq_end_io()
1390 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_rq_end_io()
1392 		if (sfp->keep_orphan)  in sg_rq_end_io()
1398 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_rq_end_io()
1404 		wake_up_interruptible(&sfp->read_wait);  in sg_rq_end_io()
1405 		kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);  in sg_rq_end_io()
1406 		kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_rq_end_io()
1601 	Sg_fd *sfp;  in sg_remove_device()  local
1615 	list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {  in sg_remove_device()
1616 		wake_up_interruptible_all(&sfp->read_wait);  in sg_remove_device()
1617 		kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);  in sg_remove_device()
1703 	Sg_fd *sfp = srp->parentfp;  in sg_start_req()  local
1709 	Sg_scatter_hold *rsv_schp = &sfp->reserve;  in sg_start_req()
1710 	struct request_queue *q = sfp->parentdp->device->request_queue;  in sg_start_req()
1715 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_start_req()
1758 	    !sfp->parentdp->device->host->unchecked_isa_dma &&  in sg_start_req()
1765 		mutex_lock(&sfp->f_mutex);  in sg_start_req()
1767 		    !sfp->res_in_use) {  in sg_start_req()
1768 			sfp->res_in_use = 1;  in sg_start_req()
1769 			sg_link_reserve(sfp, srp, dxfer_len);  in sg_start_req()
1774 			mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1777 			res = sg_build_indirect(req_schp, sfp, dxfer_len);  in sg_start_req()
1779 				mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1783 		mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1832 	Sg_fd *sfp = srp->parentfp;  in sg_finish_rem_req()  local
1835 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_finish_rem_req()
1847 		sg_unlink_reserve(sfp, srp);  in sg_finish_rem_req()
1849 		sg_remove_scat(sfp, req_schp);  in sg_finish_rem_req()
1855 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)  in sg_build_sgat()  argument
1868 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)  in sg_build_indirect()  argument
1871 	int sg_tablesize = sfp->parentdp->sg_tablesize;  in sg_build_indirect()
1874 	struct sg_device *sdp = sfp->parentdp;  in sg_build_indirect()
1882 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1887 	mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);  in sg_build_indirect()
1924 		SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1931 	SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1950 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)  in sg_remove_scat()  argument
1952 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_remove_scat()
1960 					sg_printk(KERN_INFO, sfp->parentdp,  in sg_remove_scat()
2006 sg_build_reserve(Sg_fd * sfp, int req_size)  in sg_build_reserve()  argument
2008 	Sg_scatter_hold *schp = &sfp->reserve;  in sg_build_reserve()
2010 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_reserve()
2015 		if (0 == sg_build_indirect(schp, sfp, req_size))  in sg_build_reserve()
2018 			sg_remove_scat(sfp, schp);  in sg_build_reserve()
2024 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)  in sg_link_reserve()  argument
2027 	Sg_scatter_hold *rsv_schp = &sfp->reserve;  in sg_link_reserve()
2031 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_link_reserve()
2050 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_link_reserve()
2055 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)  in sg_unlink_reserve()  argument
2069 	sfp->res_in_use = 0;  in sg_unlink_reserve()
2073 sg_get_rq_mark(Sg_fd * sfp, int pack_id)  in sg_get_rq_mark()  argument
2078 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2079 	list_for_each_entry(resp, &sfp->rq_list, entry) {  in sg_get_rq_mark()
2084 			write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2088 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2094 sg_add_request(Sg_fd * sfp)  in sg_add_request()  argument
2098 	Sg_request *rp = sfp->req_arr;  in sg_add_request()
2100 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_add_request()
2101 	if (!list_empty(&sfp->rq_list)) {  in sg_add_request()
2102 		if (!sfp->cmd_q)  in sg_add_request()
2113 	rp->parentfp = sfp;  in sg_add_request()
2115 	list_add_tail(&rp->entry, &sfp->rq_list);  in sg_add_request()
2116 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_add_request()
2119 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_add_request()
2125 sg_remove_request(Sg_fd * sfp, Sg_request * srp)  in sg_remove_request()  argument
2130 	if (!sfp || !srp || list_empty(&sfp->rq_list))  in sg_remove_request()
2132 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_remove_request()
2138 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_remove_request()
2145 	Sg_fd *sfp;  in sg_add_sfp()  local
2149 	sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);  in sg_add_sfp()
2150 	if (!sfp)  in sg_add_sfp()
2153 	init_waitqueue_head(&sfp->read_wait);  in sg_add_sfp()
2154 	rwlock_init(&sfp->rq_list_lock);  in sg_add_sfp()
2155 	INIT_LIST_HEAD(&sfp->rq_list);  in sg_add_sfp()
2156 	kref_init(&sfp->f_ref);  in sg_add_sfp()
2157 	mutex_init(&sfp->f_mutex);  in sg_add_sfp()
2158 	sfp->timeout = SG_DEFAULT_TIMEOUT;  in sg_add_sfp()
2159 	sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;  in sg_add_sfp()
2160 	sfp->force_packid = SG_DEF_FORCE_PACK_ID;  in sg_add_sfp()
2161 	sfp->cmd_q = SG_DEF_COMMAND_Q;  in sg_add_sfp()
2162 	sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;  in sg_add_sfp()
2163 	sfp->parentdp = sdp;  in sg_add_sfp()
2167 		kfree(sfp);  in sg_add_sfp()
2170 	list_add_tail(&sfp->sfd_siblings, &sdp->sfds);  in sg_add_sfp()
2173 				      "sg_add_sfp: sfp=0x%p\n", sfp));  in sg_add_sfp()
2179 	sg_build_reserve(sfp, bufflen);  in sg_add_sfp()
2182 				      sfp->reserve.bufflen,  in sg_add_sfp()
2183 				      sfp->reserve.k_use_sg));  in sg_add_sfp()
2187 	return sfp;  in sg_add_sfp()
2193 	struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);  in sg_remove_sfp_usercontext()  local
2194 	struct sg_device *sdp = sfp->parentdp;  in sg_remove_sfp_usercontext()
2199 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_remove_sfp_usercontext()
2200 	while (!list_empty(&sfp->rq_list)) {  in sg_remove_sfp_usercontext()
2201 		srp = list_first_entry(&sfp->rq_list, Sg_request, entry);  in sg_remove_sfp_usercontext()
2206 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_remove_sfp_usercontext()
2208 	if (sfp->reserve.bufflen > 0) {  in sg_remove_sfp_usercontext()
2211 				(int) sfp->reserve.bufflen,  in sg_remove_sfp_usercontext()
2212 				(int) sfp->reserve.k_use_sg));  in sg_remove_sfp_usercontext()
2213 		sg_remove_scat(sfp, &sfp->reserve);  in sg_remove_sfp_usercontext()
2217 			"sg_remove_sfp: sfp=0x%p\n", sfp));  in sg_remove_sfp_usercontext()
2218 	kfree(sfp);  in sg_remove_sfp_usercontext()
2228 	struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);  in sg_remove_sfp()  local
2229 	struct sg_device *sdp = sfp->parentdp;  in sg_remove_sfp()
2233 	list_del(&sfp->sfd_siblings);  in sg_remove_sfp()
2236 	INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);  in sg_remove_sfp()
2237 	schedule_work(&sfp->ew.work);  in sg_remove_sfp()