70 static void simdisk_transfer(struct simdisk *dev, unsigned long sector,  in simdisk_transfer()  argument
76 	if (offset > dev->size || dev->size - offset < nbytes) {  in simdisk_transfer()
82 	spin_lock(&dev->lock);  in simdisk_transfer()
86 		simc_lseek(dev->fd, offset, SEEK_SET);  in simdisk_transfer()
89 			io = simc_write(dev->fd, buffer, nbytes);  in simdisk_transfer()
91 			io = simc_read(dev->fd, buffer, nbytes);  in simdisk_transfer()
100 	spin_unlock(&dev->lock);  in simdisk_transfer()
105 	struct simdisk *dev = bio->bi_bdev->bd_disk->private_data;  in simdisk_submit_bio()  local
114 		simdisk_transfer(dev, sector, len, buffer,  in simdisk_submit_bio()
125 	struct simdisk *dev = disk->private_data;  in simdisk_open()  local
127 	spin_lock(&dev->lock);  in simdisk_open()
128 	++dev->users;  in simdisk_open()
129 	spin_unlock(&dev->lock);  in simdisk_open()
135 	struct simdisk *dev = disk->private_data;  in simdisk_release()  local
136 	spin_lock(&dev->lock);  in simdisk_release()
137 	--dev->users;  in simdisk_release()
138 	spin_unlock(&dev->lock);  in simdisk_release()
151 static int simdisk_attach(struct simdisk *dev, const char *filename)  in simdisk_attach()  argument
159 	spin_lock(&dev->lock);  in simdisk_attach()
161 	if (dev->fd != -1) {  in simdisk_attach()
165 	dev->fd = simc_open(filename, O_RDWR, 0);  in simdisk_attach()
166 	if (dev->fd == -1) {  in simdisk_attach()
171 	dev->size = simc_lseek(dev->fd, 0, SEEK_END);  in simdisk_attach()
172 	set_capacity(dev->gd, dev->size >> SECTOR_SHIFT);  in simdisk_attach()
173 	dev->filename = filename;  in simdisk_attach()
174 	pr_info("SIMDISK: %s=%s\n", dev->gd->disk_name, dev->filename);  in simdisk_attach()
178 	spin_unlock(&dev->lock);  in simdisk_attach()
183 static int simdisk_detach(struct simdisk *dev)  in simdisk_detach()  argument
187 	spin_lock(&dev->lock);  in simdisk_detach()
189 	if (dev->users != 0) {  in simdisk_detach()
191 	} else if (dev->fd != -1) {  in simdisk_detach()
192 		if (simc_close(dev->fd)) {  in simdisk_detach()
194 					dev->filename, errno);  in simdisk_detach()
198 					dev->gd->disk_name, dev->filename);  in simdisk_detach()
199 			dev->fd = -1;  in simdisk_detach()
200 			kfree(dev->filename);  in simdisk_detach()
201 			dev->filename = NULL;  in simdisk_detach()
204 	spin_unlock(&dev->lock);  in simdisk_detach()
211 	struct simdisk *dev = pde_data(file_inode(file));  in proc_read_simdisk()  local
212 	const char *s = dev->filename;  in proc_read_simdisk()
234 	struct simdisk *dev = pde_data(file_inode(file));  in proc_write_simdisk()  local
240 	err = simdisk_detach(dev);  in proc_write_simdisk()
248 		err = simdisk_attach(dev, tmp);  in proc_write_simdisk()
263 static int __init simdisk_setup(struct simdisk *dev, int which,  in simdisk_setup()  argument
269 	dev->fd = -1;  in simdisk_setup()
270 	dev->filename = NULL;  in simdisk_setup()
271 	spin_lock_init(&dev->lock);  in simdisk_setup()
272 	dev->users = 0;  in simdisk_setup()
274 	dev->gd = blk_alloc_disk(NUMA_NO_NODE);  in simdisk_setup()
275 	if (!dev->gd)  in simdisk_setup()
277 	dev->gd->major = simdisk_major;  in simdisk_setup()
278 	dev->gd->first_minor = which;  in simdisk_setup()
279 	dev->gd->minors = SIMDISK_MINORS;  in simdisk_setup()
280 	dev->gd->fops = &simdisk_ops;  in simdisk_setup()
281 	dev->gd->private_data = dev;  in simdisk_setup()
282 	snprintf(dev->gd->disk_name, 32, "simdisk%d", which);  in simdisk_setup()
283 	set_capacity(dev->gd, 0);  in simdisk_setup()
284 	err = add_disk(dev->gd);  in simdisk_setup()
288 	dev->procfile = proc_create_data(tmp, 0644, procdir, &simdisk_proc_ops, dev);  in simdisk_setup()
293 	put_disk(dev->gd);  in simdisk_setup()
339 static void simdisk_teardown(struct simdisk *dev, int which,  in simdisk_teardown()  argument
344 	simdisk_detach(dev);  in simdisk_teardown()
345 	if (dev->gd) {  in simdisk_teardown()
346 		del_gendisk(dev->gd);  in simdisk_teardown()
347 		put_disk(dev->gd);  in simdisk_teardown()