1 files changed, 0 insertions, 444 deletions
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
deleted file mode 100644
index 1b3924c2fffd..000000000000
--- a/drivers/s390/char/tape_block.c
+++ /dev/null
@@ -1,444 +0,0 @@
-/*
- *  drivers/s390/char/tape_block.c
- *    block device frontend for tape device driver
- *
- *  S390 and zSeries version
- *    Copyright (C) 2001,2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
- *    Author(s): Carsten Otte <cotte@de.ibm.com>
- *		 Tuan Ngo-Anh <ngoanh@de.ibm.com>
- *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
- *		 Stefan Bader <shbader@de.ibm.com>
- */
-
-#define KMSG_COMPONENT "tape"
-#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
-
-#include <linux/fs.h>
-#include <linux/module.h>
-#include <linux/blkdev.h>
-#include <linux/mutex.h>
-#include <linux/interrupt.h>
-#include <linux/buffer_head.h>
-#include <linux/kernel.h>
-
-#include <asm/debug.h>
-
-#define TAPE_DBF_AREA	tape_core_dbf
-
-#include "tape.h"
-
-#define TAPEBLOCK_MAX_SEC	100
-#define TAPEBLOCK_MIN_REQUEUE	3
-
-/*
- * 2003/11/25  Stefan Bader <shbader@de.ibm.com>
- *
- * In 2.5/2.6 the block device request function is very likely to be called
- * with disabled interrupts (e.g. generic_unplug_device). So the driver can't
- * just call any function that tries to allocate CCW requests from that con-
- * text since it might sleep. There are two choices to work around this:
- *	a) do not allocate with kmalloc but use its own memory pool
- *      b) take requests from the queue outside that context, knowing that
- *         allocation might sleep
- */
-
-/*
- * file operation structure for tape block frontend
- */
-static DEFINE_MUTEX(tape_block_mutex);
-static int tapeblock_open(struct block_device *, fmode_t);
-static int tapeblock_release(struct gendisk *, fmode_t);
-static unsigned int tapeblock_check_events(struct gendisk *, unsigned int);
-static int tapeblock_revalidate_disk(struct gendisk *);
-
-static const struct block_device_operations tapeblock_fops = {
-	.owner		 = THIS_MODULE,
-	.open		 = tapeblock_open,
-	.release	 = tapeblock_release,
-	.check_events	 = tapeblock_check_events,
-	.revalidate_disk = tapeblock_revalidate_disk,
-};
-
-static int tapeblock_major = 0;
-
-static void
-tapeblock_trigger_requeue(struct tape_device *device)
-{
-	/* Protect against rescheduling. */
-	if (atomic_cmpxchg(&device->blk_data.requeue_scheduled, 0, 1) != 0)
-		return;
-	schedule_work(&device->blk_data.requeue_task);
-}
-
-/*
- * Post finished request.
- */
-static void
-__tapeblock_end_request(struct tape_request *ccw_req, void *data)
-{
-	struct tape_device *device;
-	struct request *req;
-
-	DBF_LH(6, "__tapeblock_end_request()\n");
-
-	device = ccw_req->device;
-	req = (struct request *) data;
-	blk_end_request_all(req, (ccw_req->rc == 0) ? 0 : -EIO);
-	if (ccw_req->rc == 0)
-		/* Update position. */
-		device->blk_data.block_position =
-		  (blk_rq_pos(req) + blk_rq_sectors(req)) >> TAPEBLOCK_HSEC_S2B;
-	else
-		/* We lost the position information due to an error. */
-		device->blk_data.block_position = -1;
-	device->discipline->free_bread(ccw_req);
-	if (!list_empty(&device->req_queue) ||
-	    blk_peek_request(device->blk_data.request_queue))
-		tapeblock_trigger_requeue(device);
-}
-
-/*
- * Feed the tape device CCW queue with requests supplied in a list.
- */
-static int
-tapeblock_start_request(struct tape_device *device, struct request *req)
-{
-	struct tape_request *	ccw_req;
-	int			rc;
-
-	DBF_LH(6, "tapeblock_start_request(%p, %p)\n", device, req);
-
-	ccw_req = device->discipline->bread(device, req);
-	if (IS_ERR(ccw_req)) {
-		DBF_EVENT(1, "TBLOCK: bread failed\n");
-		blk_end_request_all(req, -EIO);
-		return PTR_ERR(ccw_req);
-	}
-	ccw_req->callback = __tapeblock_end_request;
-	ccw_req->callback_data = (void *) req;
-	ccw_req->retries = TAPEBLOCK_RETRIES;
-
-	rc = tape_do_io_async(device, ccw_req);
-	if (rc) {
-		/*
-		 * Start/enqueueing failed. No retries in
-		 * this case.
-		 */
-		blk_end_request_all(req, -EIO);
-		device->discipline->free_bread(ccw_req);
-	}
-
-	return rc;
-}
-
-/*
- * Move requests from the block device request queue to the tape device ccw
- * queue.
- */
-static void
-tapeblock_requeue(struct work_struct *work) {
-	struct tape_blk_data *	blkdat;
-	struct tape_device *	device;
-	struct request_queue *	queue;
-	int			nr_queued;
-	struct request *	req;
-	struct list_head *	l;
-	int			rc;
-
-	blkdat = container_of(work, struct tape_blk_data, requeue_task);
-	device = blkdat->device;
-	if (!device)
-		return;
-
-	spin_lock_irq(get_ccwdev_lock(device->cdev));
-	queue  = device->blk_data.request_queue;
-
-	/* Count number of requests on ccw queue. */
-	nr_queued = 0;
-	list_for_each(l, &device->req_queue)
-		nr_queued++;
-	spin_unlock(get_ccwdev_lock(device->cdev));
-
-	spin_lock_irq(&device->blk_data.request_queue_lock);
-	while (
-		blk_peek_request(queue) &&
-		nr_queued < TAPEBLOCK_MIN_REQUEUE
-	) {
-		req = blk_fetch_request(queue);
-		if (rq_data_dir(req) == WRITE) {
-			DBF_EVENT(1, "TBLOCK: Rejecting write request\n");
-			spin_unlock_irq(&device->blk_data.request_queue_lock);
-			blk_end_request_all(req, -EIO);
-			spin_lock_irq(&device->blk_data.request_queue_lock);
-			continue;
-		}
-		nr_queued++;
-		spin_unlock_irq(&device->blk_data.request_queue_lock);
-		rc = tapeblock_start_request(device, req);
-		spin_lock_irq(&device->blk_data.request_queue_lock);
-	}
-	spin_unlock_irq(&device->blk_data.request_queue_lock);
-	atomic_set(&device->blk_data.requeue_scheduled, 0);
-}
-
-/*
- * Tape request queue function. Called from ll_rw_blk.c
- */
-static void
-tapeblock_request_fn(struct request_queue *queue)
-{
-	struct tape_device *device;
-
-	device = (struct tape_device *) queue->queuedata;
-	DBF_LH(6, "tapeblock_request_fn(device=%p)\n", device);
-	BUG_ON(device == NULL);
-	tapeblock_trigger_requeue(device);
-}
-
-/*
- * This function is called for every new tapedevice
- */
-int
-tapeblock_setup_device(struct tape_device * device)
-{
-	struct tape_blk_data *	blkdat;
-	struct gendisk *	disk;
-	int			rc;
-
-	blkdat = &device->blk_data;
-	blkdat->device = device;
-	spin_lock_init(&blkdat->request_queue_lock);
-	atomic_set(&blkdat->requeue_scheduled, 0);
-
-	blkdat->request_queue = blk_init_queue(
-		tapeblock_request_fn,
-		&blkdat->request_queue_lock
-	);
-	if (!blkdat->request_queue)
-		return -ENOMEM;
-
-	rc = elevator_change(blkdat->request_queue, "noop");
-	if (rc)
-		goto cleanup_queue;
-
-	blk_queue_logical_block_size(blkdat->request_queue, TAPEBLOCK_HSEC_SIZE);
-	blk_queue_max_hw_sectors(blkdat->request_queue, TAPEBLOCK_MAX_SEC);
-	blk_queue_max_segments(blkdat->request_queue, -1L);
-	blk_queue_max_segment_size(blkdat->request_queue, -1L);
-	blk_queue_segment_boundary(blkdat->request_queue, -1L);
-
-	disk = alloc_disk(1);
-	if (!disk) {
-		rc = -ENOMEM;
-		goto cleanup_queue;
-	}
-
-	disk->major = tapeblock_major;
-	disk->first_minor = device->first_minor;
-	disk->fops = &tapeblock_fops;
-	disk->private_data = tape_get_device(device);
-	disk->queue = blkdat->request_queue;
-	set_capacity(disk, 0);
-	sprintf(disk->disk_name, "btibm%d",
-		device->first_minor / TAPE_MINORS_PER_DEV);
-
-	blkdat->disk = disk;
-	blkdat->medium_changed = 1;
-	blkdat->request_queue->queuedata = tape_get_device(device);
-
-	add_disk(disk);
-
-	tape_get_device(device);
-	INIT_WORK(&blkdat->requeue_task, tapeblock_requeue);
-
-	return 0;
-
-cleanup_queue:
-	blk_cleanup_queue(blkdat->request_queue);
-	blkdat->request_queue = NULL;
-
-	return rc;
-}
-
-void
-tapeblock_cleanup_device(struct tape_device *device)
-{
-	flush_work_sync(&device->blk_data.requeue_task);
-	tape_put_device(device);
-
-	if (!device->blk_data.disk) {
-		goto cleanup_queue;
-	}
-
-	del_gendisk(device->blk_data.disk);
-	device->blk_data.disk->private_data = NULL;
-	tape_put_device(device);
-	put_disk(device->blk_data.disk);
-
-	device->blk_data.disk = NULL;
-cleanup_queue:
-	device->blk_data.request_queue->queuedata = NULL;
-	tape_put_device(device);
-
-	blk_cleanup_queue(device->blk_data.request_queue);
-	device->blk_data.request_queue = NULL;
-}
-
-/*
- * Detect number of blocks of the tape.
- * FIXME: can we extent this to detect the blocks size as well ?
- */
-static int
-tapeblock_revalidate_disk(struct gendisk *disk)
-{
-	struct tape_device *	device;
-	unsigned int		nr_of_blks;
-	int			rc;
-
-	device = (struct tape_device *) disk->private_data;
-	BUG_ON(!device);
-
-	if (!device->blk_data.medium_changed)
-		return 0;
-
-	rc = tape_mtop(device, MTFSFM, 1);
-	if (rc)
-		return rc;
-
-	rc = tape_mtop(device, MTTELL, 1);
-	if (rc < 0)
-		return rc;
-
-	pr_info("%s: Determining the size of the recorded area...\n",
-		dev_name(&device->cdev->dev));
-	DBF_LH(3, "Image file ends at %d\n", rc);
-	nr_of_blks = rc;
-
-	/* This will fail for the first file. Catch the error by checking the
-	 * position. */
-	tape_mtop(device, MTBSF, 1);
-
-	rc = tape_mtop(device, MTTELL, 1);
-	if (rc < 0)
-		return rc;
-
-	if (rc > nr_of_blks)
-		return -EINVAL;
-
-	DBF_LH(3, "Image file starts at %d\n", rc);
-	device->bof = rc;
-	nr_of_blks -= rc;
-
-	pr_info("%s: The size of the recorded area is %i blocks\n",
-		dev_name(&device->cdev->dev), nr_of_blks);
-	set_capacity(device->blk_data.disk,
-		nr_of_blks*(TAPEBLOCK_HSEC_SIZE/512));
-
-	device->blk_data.block_position = 0;
-	device->blk_data.medium_changed = 0;
-	return 0;
-}
-
-static unsigned int
-tapeblock_check_events(struct gendisk *disk, unsigned int clearing)
-{
-	struct tape_device *device;
-
-	device = (struct tape_device *) disk->private_data;
-	DBF_LH(6, "tapeblock_medium_changed(%p) = %d\n",
-		device, device->blk_data.medium_changed);
-
-	return device->blk_data.medium_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
-}
-
-/*
- * Block frontend tape device open function.
- */
-static int
-tapeblock_open(struct block_device *bdev, fmode_t mode)
-{
-	struct gendisk *	disk = bdev->bd_disk;
-	struct tape_device *	device;
-	int			rc;
-
-	mutex_lock(&tape_block_mutex);
-	device = tape_get_device(disk->private_data);
-
-	if (device->required_tapemarks) {
-		DBF_EVENT(2, "TBLOCK: missing tapemarks\n");
-		pr_warning("%s: Opening the tape failed because of missing "
-			   "end-of-file marks\n", dev_name(&device->cdev->dev));
-		rc = -EPERM;
-		goto put_device;
-	}
-
-	rc = tape_open(device);
-	if (rc)
-		goto put_device;
-
-	rc = tapeblock_revalidate_disk(disk);
-	if (rc)
-		goto release;
-
-	/*
-	 * Note: The reference to <device> is hold until the release function
-	 *       is called.
-	 */
-	tape_state_set(device, TS_BLKUSE);
-	mutex_unlock(&tape_block_mutex);
-	return 0;
-
-release:
-	tape_release(device);
- put_device:
-	tape_put_device(device);
-	mutex_unlock(&tape_block_mutex);
-	return rc;
-}
-
-/*
- * Block frontend tape device release function.
- *
- * Note: One reference to the tape device was made by the open function. So
- *       we just get the pointer here and release the reference.
- */
-static int
-tapeblock_release(struct gendisk *disk, fmode_t mode)
-{
-	struct tape_device *device = disk->private_data;
- 
-	mutex_lock(&tape_block_mutex);
-	tape_state_set(device, TS_IN_USE);
-	tape_release(device);
-	tape_put_device(device);
-	mutex_unlock(&tape_block_mutex);
-
-	return 0;
-}
-
-/*
- * Initialize block device frontend.
- */
-int
-tapeblock_init(void)
-{
-	int rc;
-
-	/* Register the tape major number to the kernel */
-	rc = register_blkdev(tapeblock_major, "tBLK");
-	if (rc < 0)
-		return rc;
-
-	if (tapeblock_major == 0)
-		tapeblock_major = rc;
-	return 0;
-}
-
-/*
- * Deregister major for block device frontend
- */
-void
-tapeblock_exit(void)
-{
-	unregister_blkdev(tapeblock_major, "tBLK");
-}