3 files changed, 0 insertions, 457 deletions

diff --git a/drivers/s390/char/Kconfig b/drivers/s390/char/Kconfig
index dcee3c5c8954..a4f117d9fdc6 100644
--- a/drivers/s390/char/Kconfig
+++ b/drivers/s390/char/Kconfig
@@ -119,18 +119,6 @@ config S390_TAPE
 comment "S/390 tape interface support"
         depends on S390_TAPE
 
-config S390_TAPE_BLOCK
-        def_bool y
-        prompt "Support for tape block devices"
-        depends on S390_TAPE && BLOCK
-        help
-          Select this option if you want to access your channel-attached tape
-          devices using the block device interface.  This interface is similar
-          to CD-ROM devices on other platforms.  The tapes can only be
-          accessed read-only when using this interface.  Have a look at
-          <file:Documentation/s390/TAPE> for further information about creating
-          volumes for and using this interface.  It is safe to say "Y" here.
-
 comment "S/390 tape hardware support"
         depends on S390_TAPE
 
diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index efb500ab66c0..af01b5abd069 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -22,7 +22,6 @@ obj-$(CONFIG_ZVM_WATCHDOG) += vmwatchdog.o
 obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
 obj-$(CONFIG_VMCP) += vmcp.o
 
-tape-$(CONFIG_S390_TAPE_BLOCK) += tape_block.o
 tape-$(CONFIG_PROC_FS) += tape_proc.o
 tape-objs := tape_core.o tape_std.o tape_char.o $(tape-y)
 obj-$(CONFIG_S390_TAPE) += tape.o tape_class.o
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");
-}