183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
192 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
193 static void sg_build_reserve(Sg_fd * sfp, int req_size);
194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
198 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
199 static Sg_request *sg_add_request(Sg_fd * sfp);
200 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
242 	struct sg_fd *sfp = filp->private_data;  in sg_allow_access()  local
244 	if (sfp->parentdp->device->type == TYPE_SCANNER)  in sg_allow_access()
294 	Sg_fd *sfp;  in sg_open()  local
355 	sfp = sg_add_sfp(sdp);  in sg_open()
356 	if (IS_ERR(sfp)) {  in sg_open()
357 		retval = PTR_ERR(sfp);  in sg_open()
361 	filp->private_data = sfp;  in sg_open()
390 	Sg_fd *sfp;  in sg_release()  local
392 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_release()
398 	kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_release()
417 	Sg_fd *sfp;  in sg_read()  local
432 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_read()
439 	if (sfp->force_packid && (count >= SZ_SG_HEADER)) {  in sg_read()
467 	srp = sg_get_rq_mark(sfp, req_pack_id);  in sg_read()
477 		retval = wait_event_interruptible(sfp->read_wait,  in sg_read()
479 			(srp = sg_get_rq_mark(sfp, req_pack_id))));  in sg_read()
490 		retval = sg_new_read(sfp, buf, count, srp);  in sg_read()
562 	sg_remove_request(sfp, srp);  in sg_read()
570 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)  in sg_new_read()  argument
603 	sg_remove_request(sfp, srp);  in sg_new_read()
614 	Sg_fd *sfp;  in sg_write()  local
625 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_write()
643 		return sg_new_write(sfp, filp, buf, count,  in sg_write()
648 	if (!(srp = sg_add_request(sfp))) {  in sg_write()
655 	mutex_lock(&sfp->f_mutex);  in sg_write()
656 	if (sfp->next_cmd_len > 0) {  in sg_write()
657 		cmd_size = sfp->next_cmd_len;  in sg_write()
658 		sfp->next_cmd_len = 0;	/* reset so only this write() effected */  in sg_write()
664 	mutex_unlock(&sfp->f_mutex);  in sg_write()
673 		sg_remove_request(sfp, srp);  in sg_write()
714 	k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);  in sg_write()
719 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,  in sg_new_write()  argument
735 	sfp->cmd_q = 1;	/* when sg_io_hdr seen, set command queuing on */  in sg_new_write()
736 	if (!(srp = sg_add_request(sfp))) {  in sg_new_write()
737 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_new_write()
744 		sg_remove_request(sfp, srp);  in sg_new_write()
748 		sg_remove_request(sfp, srp);  in sg_new_write()
752 		if (hp->dxfer_len > sfp->reserve.bufflen) {  in sg_new_write()
753 			sg_remove_request(sfp, srp);  in sg_new_write()
757 			sg_remove_request(sfp, srp);  in sg_new_write()
760 		if (sfp->res_in_use) {  in sg_new_write()
761 			sg_remove_request(sfp, srp);  in sg_new_write()
768 		sg_remove_request(sfp, srp);  in sg_new_write()
772 		sg_remove_request(sfp, srp);  in sg_new_write()
776 		sg_remove_request(sfp, srp);  in sg_new_write()
780 		sg_remove_request(sfp, srp);  in sg_new_write()
783 	k = sg_common_write(sfp, srp, cmnd, timeout, blocking);  in sg_new_write()
792 sg_common_write(Sg_fd * sfp, Sg_request * srp,  in sg_common_write()  argument
796 	Sg_device *sdp = sfp->parentdp;  in sg_common_write()
807 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_common_write()
816 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_common_write()
819 		sg_remove_request(sfp, srp);  in sg_common_write()
830 		sg_remove_request(sfp, srp);  in sg_common_write()
842 	kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */  in sg_common_write()
848 static int srp_done(Sg_fd *sfp, Sg_request *srp)  in srp_done()  argument
853 	read_lock_irqsave(&sfp->rq_list_lock, flags);  in srp_done()
855 	read_unlock_irqrestore(&sfp->rq_list_lock, flags);  in srp_done()
869 sg_fill_request_table(Sg_fd *sfp, sg_req_info_t *rinfo)  in sg_fill_request_table()  argument
876 	list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_fill_request_table()
908 	Sg_fd *sfp;  in sg_ioctl()  local
912 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_ioctl()
927 		result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,  in sg_ioctl()
931 		result = wait_event_interruptible(sfp->read_wait,  in sg_ioctl()
932 			(srp_done(sfp, srp) || atomic_read(&sdp->detaching)));  in sg_ioctl()
935 		write_lock_irq(&sfp->rq_list_lock);  in sg_ioctl()
938 			write_unlock_irq(&sfp->rq_list_lock);  in sg_ioctl()
939 			result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);  in sg_ioctl()
943 		write_unlock_irq(&sfp->rq_list_lock);  in sg_ioctl()
954 		sfp->timeout_user = val;  in sg_ioctl()
955 		sfp->timeout = mult_frac(val, HZ, USER_HZ);  in sg_ioctl()
960 		return sfp->timeout_user;  in sg_ioctl()
997 		sfp->force_packid = val ? 1 : 0;  in sg_ioctl()
1002 		read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1003 		list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_ioctl()
1005 				read_unlock_irqrestore(&sfp->rq_list_lock,  in sg_ioctl()
1011 		read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1015 		read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1017 		list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_ioctl()
1021 		read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1033 		mutex_lock(&sfp->f_mutex);  in sg_ioctl()
1034 		if (val != sfp->reserve.bufflen) {  in sg_ioctl()
1035 			if (sfp->mmap_called ||  in sg_ioctl()
1036 			    sfp->res_in_use) {  in sg_ioctl()
1037 				mutex_unlock(&sfp->f_mutex);  in sg_ioctl()
1041 			sg_remove_scat(sfp, &sfp->reserve);  in sg_ioctl()
1042 			sg_build_reserve(sfp, val);  in sg_ioctl()
1044 		mutex_unlock(&sfp->f_mutex);  in sg_ioctl()
1047 		val = min_t(int, sfp->reserve.bufflen,  in sg_ioctl()
1054 		sfp->cmd_q = val ? 1 : 0;  in sg_ioctl()
1057 		return put_user((int) sfp->cmd_q, ip);  in sg_ioctl()
1062 		sfp->keep_orphan = val;  in sg_ioctl()
1065 		return put_user((int) sfp->keep_orphan, ip);  in sg_ioctl()
1072 		sfp->next_cmd_len = (val > 0) ? val : 0;  in sg_ioctl()
1090 			read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1091 			sg_fill_request_table(sfp, rinfo);  in sg_ioctl()
1092 			read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_ioctl()
1152 	Sg_fd *sfp;  in sg_compat_ioctl()  local
1155 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_compat_ioctl()
1176 	Sg_fd *sfp;  in sg_poll()  local
1181 	sfp = filp->private_data;  in sg_poll()
1182 	if (!sfp)  in sg_poll()
1184 	sdp = sfp->parentdp;  in sg_poll()
1187 	poll_wait(filp, &sfp->read_wait, wait);  in sg_poll()
1188 	read_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_poll()
1189 	list_for_each_entry(srp, &sfp->rq_list, entry) {  in sg_poll()
1195 	read_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_poll()
1199 	else if (!sfp->cmd_q) {  in sg_poll()
1213 	Sg_fd *sfp;  in sg_fasync()  local
1215 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))  in sg_fasync()
1220 	return fasync_helper(fd, filp, mode, &sfp->async_qp);  in sg_fasync()
1227 	Sg_fd *sfp;  in sg_vma_fault()  local
1232 	if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))  in sg_vma_fault()
1234 	rsv_schp = &sfp->reserve;  in sg_vma_fault()
1238 	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,  in sg_vma_fault()
1267 	Sg_fd *sfp;  in sg_mmap()  local
1273 	if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))  in sg_mmap()
1276 	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,  in sg_mmap()
1281 	rsv_schp = &sfp->reserve;  in sg_mmap()
1282 	mutex_lock(&sfp->f_mutex);  in sg_mmap()
1296 	sfp->mmap_called = 1;  in sg_mmap()
1298 	vma->vm_private_data = sfp;  in sg_mmap()
1301 	mutex_unlock(&sfp->f_mutex);  in sg_mmap()
1309 	struct sg_fd *sfp = srp->parentfp;  in sg_rq_end_io_usercontext()  local
1312 	sg_remove_request(sfp, srp);  in sg_rq_end_io_usercontext()
1313 	kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_rq_end_io_usercontext()
1326 	Sg_fd *sfp;  in sg_rq_end_io()  local
1335 	sfp = srp->parentfp;  in sg_rq_end_io()
1336 	if (WARN_ON(sfp == NULL))  in sg_rq_end_io()
1339 	sdp = sfp->parentdp;  in sg_rq_end_io()
1395 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_rq_end_io()
1397 		if (sfp->keep_orphan)  in sg_rq_end_io()
1403 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_rq_end_io()
1409 		wake_up_interruptible(&sfp->read_wait);  in sg_rq_end_io()
1410 		kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);  in sg_rq_end_io()
1411 		kref_put(&sfp->f_ref, sg_remove_sfp);  in sg_rq_end_io()
1606 	Sg_fd *sfp;  in sg_remove_device()  local
1620 	list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {  in sg_remove_device()
1621 		wake_up_interruptible_all(&sfp->read_wait);  in sg_remove_device()
1622 		kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);  in sg_remove_device()
1708 	Sg_fd *sfp = srp->parentfp;  in sg_start_req()  local
1714 	Sg_scatter_hold *rsv_schp = &sfp->reserve;  in sg_start_req()
1715 	struct request_queue *q = sfp->parentdp->device->request_queue;  in sg_start_req()
1720 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_start_req()
1763 	    !sfp->parentdp->device->host->unchecked_isa_dma &&  in sg_start_req()
1770 		mutex_lock(&sfp->f_mutex);  in sg_start_req()
1772 		    !sfp->res_in_use) {  in sg_start_req()
1773 			sfp->res_in_use = 1;  in sg_start_req()
1774 			sg_link_reserve(sfp, srp, dxfer_len);  in sg_start_req()
1779 			mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1782 			res = sg_build_indirect(req_schp, sfp, dxfer_len);  in sg_start_req()
1784 				mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1788 		mutex_unlock(&sfp->f_mutex);  in sg_start_req()
1837 	Sg_fd *sfp = srp->parentfp;  in sg_finish_rem_req()  local
1840 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_finish_rem_req()
1852 		sg_unlink_reserve(sfp, srp);  in sg_finish_rem_req()
1854 		sg_remove_scat(sfp, req_schp);  in sg_finish_rem_req()
1860 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)  in sg_build_sgat()  argument
1873 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)  in sg_build_indirect()  argument
1876 	int sg_tablesize = sfp->parentdp->sg_tablesize;  in sg_build_indirect()
1879 	struct sg_device *sdp = sfp->parentdp;  in sg_build_indirect()
1887 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1892 	mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);  in sg_build_indirect()
1929 		SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1936 	SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_indirect()
1955 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)  in sg_remove_scat()  argument
1957 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_remove_scat()
1965 					sg_printk(KERN_INFO, sfp->parentdp,  in sg_remove_scat()
2011 sg_build_reserve(Sg_fd * sfp, int req_size)  in sg_build_reserve()  argument
2013 	Sg_scatter_hold *schp = &sfp->reserve;  in sg_build_reserve()
2015 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_build_reserve()
2020 		if (0 == sg_build_indirect(schp, sfp, req_size))  in sg_build_reserve()
2023 			sg_remove_scat(sfp, schp);  in sg_build_reserve()
2029 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)  in sg_link_reserve()  argument
2032 	Sg_scatter_hold *rsv_schp = &sfp->reserve;  in sg_link_reserve()
2036 	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,  in sg_link_reserve()
2055 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,  in sg_link_reserve()
2060 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)  in sg_unlink_reserve()  argument
2074 	sfp->res_in_use = 0;  in sg_unlink_reserve()
2078 sg_get_rq_mark(Sg_fd * sfp, int pack_id)  in sg_get_rq_mark()  argument
2083 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2084 	list_for_each_entry(resp, &sfp->rq_list, entry) {  in sg_get_rq_mark()
2089 			write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2093 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_get_rq_mark()
2099 sg_add_request(Sg_fd * sfp)  in sg_add_request()  argument
2103 	Sg_request *rp = sfp->req_arr;  in sg_add_request()
2105 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_add_request()
2106 	if (!list_empty(&sfp->rq_list)) {  in sg_add_request()
2107 		if (!sfp->cmd_q)  in sg_add_request()
2118 	rp->parentfp = sfp;  in sg_add_request()
2120 	list_add_tail(&rp->entry, &sfp->rq_list);  in sg_add_request()
2121 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_add_request()
2124 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_add_request()
2130 sg_remove_request(Sg_fd * sfp, Sg_request * srp)  in sg_remove_request()  argument
2135 	if (!sfp || !srp || list_empty(&sfp->rq_list))  in sg_remove_request()
2137 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_remove_request()
2143 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_remove_request()
2150 	Sg_fd *sfp;  in sg_add_sfp()  local
2154 	sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);  in sg_add_sfp()
2155 	if (!sfp)  in sg_add_sfp()
2158 	init_waitqueue_head(&sfp->read_wait);  in sg_add_sfp()
2159 	rwlock_init(&sfp->rq_list_lock);  in sg_add_sfp()
2160 	INIT_LIST_HEAD(&sfp->rq_list);  in sg_add_sfp()
2161 	kref_init(&sfp->f_ref);  in sg_add_sfp()
2162 	mutex_init(&sfp->f_mutex);  in sg_add_sfp()
2163 	sfp->timeout = SG_DEFAULT_TIMEOUT;  in sg_add_sfp()
2164 	sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;  in sg_add_sfp()
2165 	sfp->force_packid = SG_DEF_FORCE_PACK_ID;  in sg_add_sfp()
2166 	sfp->cmd_q = SG_DEF_COMMAND_Q;  in sg_add_sfp()
2167 	sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;  in sg_add_sfp()
2168 	sfp->parentdp = sdp;  in sg_add_sfp()
2172 		kfree(sfp);  in sg_add_sfp()
2175 	list_add_tail(&sfp->sfd_siblings, &sdp->sfds);  in sg_add_sfp()
2178 				      "sg_add_sfp: sfp=0x%p\n", sfp));  in sg_add_sfp()
2184 	sg_build_reserve(sfp, bufflen);  in sg_add_sfp()
2187 				      sfp->reserve.bufflen,  in sg_add_sfp()
2188 				      sfp->reserve.k_use_sg));  in sg_add_sfp()
2192 	return sfp;  in sg_add_sfp()
2198 	struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);  in sg_remove_sfp_usercontext()  local
2199 	struct sg_device *sdp = sfp->parentdp;  in sg_remove_sfp_usercontext()
2204 	write_lock_irqsave(&sfp->rq_list_lock, iflags);  in sg_remove_sfp_usercontext()
2205 	while (!list_empty(&sfp->rq_list)) {  in sg_remove_sfp_usercontext()
2206 		srp = list_first_entry(&sfp->rq_list, Sg_request, entry);  in sg_remove_sfp_usercontext()
2211 	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);  in sg_remove_sfp_usercontext()
2213 	if (sfp->reserve.bufflen > 0) {  in sg_remove_sfp_usercontext()
2216 				(int) sfp->reserve.bufflen,  in sg_remove_sfp_usercontext()
2217 				(int) sfp->reserve.k_use_sg));  in sg_remove_sfp_usercontext()
2218 		sg_remove_scat(sfp, &sfp->reserve);  in sg_remove_sfp_usercontext()
2222 			"sg_remove_sfp: sfp=0x%p\n", sfp));  in sg_remove_sfp_usercontext()
2223 	kfree(sfp);  in sg_remove_sfp_usercontext()
2233 	struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);  in sg_remove_sfp()  local
2234 	struct sg_device *sdp = sfp->parentdp;  in sg_remove_sfp()
2238 	list_del(&sfp->sfd_siblings);  in sg_remove_sfp()
2241 	INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);  in sg_remove_sfp()
2242 	schedule_work(&sfp->ew.work);  in sg_remove_sfp()