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path: root/drivers/s390/block/dasd_ioctl.c
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Diffstat (limited to 'drivers/s390/block/dasd_ioctl.c')
-rw-r--r--drivers/s390/block/dasd_ioctl.c579
1 files changed, 579 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
new file mode 100644
index 000000000..02837d0ad
--- /dev/null
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -0,0 +1,579 @@
+/*
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ * Horst Hummel <Horst.Hummel@de.ibm.com>
+ * Carsten Otte <Cotte@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * Copyright IBM Corp. 1999, 2001
+ *
+ * i/o controls for the dasd driver.
+ */
+
+#define KMSG_COMPONENT "dasd"
+
+#include <linux/interrupt.h>
+#include <linux/compat.h>
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/blkpg.h>
+#include <linux/slab.h>
+#include <asm/compat.h>
+#include <asm/ccwdev.h>
+#include <asm/schid.h>
+#include <asm/cmb.h>
+#include <asm/uaccess.h>
+
+/* This is ugly... */
+#define PRINTK_HEADER "dasd_ioctl:"
+
+#include "dasd_int.h"
+
+
+static int
+dasd_ioctl_api_version(void __user *argp)
+{
+ int ver = DASD_API_VERSION;
+ return put_user(ver, (int __user *)argp);
+}
+
+/*
+ * Enable device.
+ * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
+ */
+static int
+dasd_ioctl_enable(struct block_device *bdev)
+{
+ struct dasd_device *base;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ base = dasd_device_from_gendisk(bdev->bd_disk);
+ if (!base)
+ return -ENODEV;
+
+ dasd_enable_device(base);
+ /* Formatting the dasd device can change the capacity. */
+ mutex_lock(&bdev->bd_mutex);
+ i_size_write(bdev->bd_inode,
+ (loff_t)get_capacity(base->block->gdp) << 9);
+ mutex_unlock(&bdev->bd_mutex);
+ dasd_put_device(base);
+ return 0;
+}
+
+/*
+ * Disable device.
+ * Used by dasdfmt. Disable I/O operations but allow ioctls.
+ */
+static int
+dasd_ioctl_disable(struct block_device *bdev)
+{
+ struct dasd_device *base;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ base = dasd_device_from_gendisk(bdev->bd_disk);
+ if (!base)
+ return -ENODEV;
+ /*
+ * Man this is sick. We don't do a real disable but only downgrade
+ * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
+ * BIODASDDISABLE to disable accesses to the device via the block
+ * device layer but it still wants to do i/o on the device by
+ * using the BIODASDFMT ioctl. Therefore the correct state for the
+ * device is DASD_STATE_BASIC that allows to do basic i/o.
+ */
+ dasd_set_target_state(base, DASD_STATE_BASIC);
+ /*
+ * Set i_size to zero, since read, write, etc. check against this
+ * value.
+ */
+ mutex_lock(&bdev->bd_mutex);
+ i_size_write(bdev->bd_inode, 0);
+ mutex_unlock(&bdev->bd_mutex);
+ dasd_put_device(base);
+ return 0;
+}
+
+/*
+ * Quiesce device.
+ */
+static int dasd_ioctl_quiesce(struct dasd_block *block)
+{
+ unsigned long flags;
+ struct dasd_device *base;
+
+ base = block->base;
+ if (!capable (CAP_SYS_ADMIN))
+ return -EACCES;
+
+ pr_info("%s: The DASD has been put in the quiesce "
+ "state\n", dev_name(&base->cdev->dev));
+ spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
+ dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
+ spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
+ return 0;
+}
+
+
+/*
+ * Resume device.
+ */
+static int dasd_ioctl_resume(struct dasd_block *block)
+{
+ unsigned long flags;
+ struct dasd_device *base;
+
+ base = block->base;
+ if (!capable (CAP_SYS_ADMIN))
+ return -EACCES;
+
+ pr_info("%s: I/O operations have been resumed "
+ "on the DASD\n", dev_name(&base->cdev->dev));
+ spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
+ dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
+ spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
+
+ dasd_schedule_block_bh(block);
+ return 0;
+}
+
+/*
+ * Abort all failfast I/O on a device.
+ */
+static int dasd_ioctl_abortio(struct dasd_block *block)
+{
+ unsigned long flags;
+ struct dasd_device *base;
+ struct dasd_ccw_req *cqr, *n;
+
+ base = block->base;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
+ return 0;
+ DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
+
+ spin_lock_irqsave(&block->request_queue_lock, flags);
+ spin_lock(&block->queue_lock);
+ list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
+ if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
+ cqr->callback_data &&
+ cqr->callback_data != DASD_SLEEPON_START_TAG &&
+ cqr->callback_data != DASD_SLEEPON_END_TAG) {
+ spin_unlock(&block->queue_lock);
+ blk_abort_request(cqr->callback_data);
+ spin_lock(&block->queue_lock);
+ }
+ }
+ spin_unlock(&block->queue_lock);
+ spin_unlock_irqrestore(&block->request_queue_lock, flags);
+
+ dasd_schedule_block_bh(block);
+ return 0;
+}
+
+/*
+ * Allow I/O on a device
+ */
+static int dasd_ioctl_allowio(struct dasd_block *block)
+{
+ struct dasd_device *base;
+
+ base = block->base;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
+ DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
+
+ return 0;
+}
+
+/*
+ * performs formatting of _device_ according to _fdata_
+ * Note: The discipline's format_function is assumed to deliver formatting
+ * commands to format multiple units of the device. In terms of the ECKD
+ * devices this means CCWs are generated to format multiple tracks.
+ */
+static int
+dasd_format(struct dasd_block *block, struct format_data_t *fdata)
+{
+ struct dasd_device *base;
+ int enable_pav = 1;
+ int rc, retries;
+ int start, stop;
+
+ base = block->base;
+ if (base->discipline->format_device == NULL)
+ return -EPERM;
+
+ if (base->state != DASD_STATE_BASIC) {
+ pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
+ dev_name(&base->cdev->dev));
+ return -EBUSY;
+ }
+
+ DBF_DEV_EVENT(DBF_NOTICE, base,
+ "formatting units %u to %u (%u B blocks) flags %u",
+ fdata->start_unit,
+ fdata->stop_unit, fdata->blksize, fdata->intensity);
+
+ /* Since dasdfmt keeps the device open after it was disabled,
+ * there still exists an inode for this device.
+ * We must update i_blkbits, otherwise we might get errors when
+ * enabling the device later.
+ */
+ if (fdata->start_unit == 0) {
+ struct block_device *bdev = bdget_disk(block->gdp, 0);
+ bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
+ bdput(bdev);
+ }
+
+ retries = 255;
+ /* backup start- and endtrack for retries */
+ start = fdata->start_unit;
+ stop = fdata->stop_unit;
+ do {
+ rc = base->discipline->format_device(base, fdata, enable_pav);
+ if (rc) {
+ if (rc == -EAGAIN) {
+ retries--;
+ /* disable PAV in case of errors */
+ enable_pav = 0;
+ fdata->start_unit = start;
+ fdata->stop_unit = stop;
+ } else
+ return rc;
+ } else
+ /* success */
+ break;
+ } while (retries);
+
+ if (!retries)
+ return -EIO;
+ else
+ return 0;
+}
+
+/*
+ * Format device.
+ */
+static int
+dasd_ioctl_format(struct block_device *bdev, void __user *argp)
+{
+ struct dasd_device *base;
+ struct format_data_t fdata;
+ int rc;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (!argp)
+ return -EINVAL;
+ base = dasd_device_from_gendisk(bdev->bd_disk);
+ if (!base)
+ return -ENODEV;
+ if (base->features & DASD_FEATURE_READONLY ||
+ test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
+ dasd_put_device(base);
+ return -EROFS;
+ }
+ if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
+ dasd_put_device(base);
+ return -EFAULT;
+ }
+ if (bdev != bdev->bd_contains) {
+ pr_warning("%s: The specified DASD is a partition and cannot "
+ "be formatted\n",
+ dev_name(&base->cdev->dev));
+ dasd_put_device(base);
+ return -EINVAL;
+ }
+ rc = dasd_format(base->block, &fdata);
+ dasd_put_device(base);
+ return rc;
+}
+
+#ifdef CONFIG_DASD_PROFILE
+/*
+ * Reset device profile information
+ */
+static int dasd_ioctl_reset_profile(struct dasd_block *block)
+{
+ dasd_profile_reset(&block->profile);
+ return 0;
+}
+
+/*
+ * Return device profile information
+ */
+static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
+{
+ struct dasd_profile_info_t *data;
+ int rc = 0;
+
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ spin_lock_bh(&block->profile.lock);
+ if (block->profile.data) {
+ data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
+ data->dasd_io_sects = block->profile.data->dasd_io_sects;
+ memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
+ sizeof(data->dasd_io_secs));
+ memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
+ sizeof(data->dasd_io_times));
+ memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
+ sizeof(data->dasd_io_timps));
+ memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
+ sizeof(data->dasd_io_time1));
+ memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
+ sizeof(data->dasd_io_time2));
+ memcpy(data->dasd_io_time2ps,
+ block->profile.data->dasd_io_time2ps,
+ sizeof(data->dasd_io_time2ps));
+ memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
+ sizeof(data->dasd_io_time3));
+ memcpy(data->dasd_io_nr_req,
+ block->profile.data->dasd_io_nr_req,
+ sizeof(data->dasd_io_nr_req));
+ spin_unlock_bh(&block->profile.lock);
+ } else {
+ spin_unlock_bh(&block->profile.lock);
+ rc = -EIO;
+ goto out;
+ }
+ if (copy_to_user(argp, data, sizeof(*data)))
+ rc = -EFAULT;
+out:
+ kfree(data);
+ return rc;
+}
+#else
+static int dasd_ioctl_reset_profile(struct dasd_block *block)
+{
+ return -ENOTTY;
+}
+
+static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
+{
+ return -ENOTTY;
+}
+#endif
+
+/*
+ * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
+ */
+static int dasd_ioctl_information(struct dasd_block *block,
+ unsigned int cmd, void __user *argp)
+{
+ struct dasd_information2_t *dasd_info;
+ struct subchannel_id sch_id;
+ struct ccw_dev_id dev_id;
+ struct dasd_device *base;
+ struct ccw_device *cdev;
+ unsigned long flags;
+ int rc;
+
+ base = block->base;
+ if (!base->discipline || !base->discipline->fill_info)
+ return -EINVAL;
+
+ dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
+ if (dasd_info == NULL)
+ return -ENOMEM;
+
+ rc = base->discipline->fill_info(base, dasd_info);
+ if (rc) {
+ kfree(dasd_info);
+ return rc;
+ }
+
+ cdev = base->cdev;
+ ccw_device_get_id(cdev, &dev_id);
+ ccw_device_get_schid(cdev, &sch_id);
+
+ dasd_info->devno = dev_id.devno;
+ dasd_info->schid = sch_id.sch_no;
+ dasd_info->cu_type = cdev->id.cu_type;
+ dasd_info->cu_model = cdev->id.cu_model;
+ dasd_info->dev_type = cdev->id.dev_type;
+ dasd_info->dev_model = cdev->id.dev_model;
+ dasd_info->status = base->state;
+ /*
+ * The open_count is increased for every opener, that includes
+ * the blkdev_get in dasd_scan_partitions.
+ * This must be hidden from user-space.
+ */
+ dasd_info->open_count = atomic_read(&block->open_count);
+ if (!block->bdev)
+ dasd_info->open_count++;
+
+ /*
+ * check if device is really formatted
+ * LDL / CDL was returned by 'fill_info'
+ */
+ if ((base->state < DASD_STATE_READY) ||
+ (dasd_check_blocksize(block->bp_block)))
+ dasd_info->format = DASD_FORMAT_NONE;
+
+ dasd_info->features |=
+ ((base->features & DASD_FEATURE_READONLY) != 0);
+
+ memcpy(dasd_info->type, base->discipline->name, 4);
+
+ if (block->request_queue->request_fn) {
+ struct list_head *l;
+#ifdef DASD_EXTENDED_PROFILING
+ {
+ struct list_head *l;
+ spin_lock_irqsave(&block->lock, flags);
+ list_for_each(l, &block->request_queue->queue_head)
+ dasd_info->req_queue_len++;
+ spin_unlock_irqrestore(&block->lock, flags);
+ }
+#endif /* DASD_EXTENDED_PROFILING */
+ spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
+ list_for_each(l, &base->ccw_queue)
+ dasd_info->chanq_len++;
+ spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
+ flags);
+ }
+
+ rc = 0;
+ if (copy_to_user(argp, dasd_info,
+ ((cmd == (unsigned int) BIODASDINFO2) ?
+ sizeof(struct dasd_information2_t) :
+ sizeof(struct dasd_information_t))))
+ rc = -EFAULT;
+ kfree(dasd_info);
+ return rc;
+}
+
+/*
+ * Set read only
+ */
+static int
+dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
+{
+ struct dasd_device *base;
+ int intval, rc;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (bdev != bdev->bd_contains)
+ // ro setting is not allowed for partitions
+ return -EINVAL;
+ if (get_user(intval, (int __user *)argp))
+ return -EFAULT;
+ base = dasd_device_from_gendisk(bdev->bd_disk);
+ if (!base)
+ return -ENODEV;
+ if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
+ dasd_put_device(base);
+ return -EROFS;
+ }
+ set_disk_ro(bdev->bd_disk, intval);
+ rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
+ dasd_put_device(base);
+ return rc;
+}
+
+static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
+ struct cmbdata __user *argp)
+{
+ size_t size = _IOC_SIZE(cmd);
+ struct cmbdata data;
+ int ret;
+
+ ret = cmf_readall(block->base->cdev, &data);
+ if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
+ return -EFAULT;
+ return ret;
+}
+
+int dasd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct dasd_block *block;
+ struct dasd_device *base;
+ void __user *argp;
+ int rc;
+
+ if (is_compat_task())
+ argp = compat_ptr(arg);
+ else
+ argp = (void __user *)arg;
+
+ if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
+ PRINT_DEBUG("empty data ptr");
+ return -EINVAL;
+ }
+
+ base = dasd_device_from_gendisk(bdev->bd_disk);
+ if (!base)
+ return -ENODEV;
+ block = base->block;
+ rc = 0;
+ switch (cmd) {
+ case BIODASDDISABLE:
+ rc = dasd_ioctl_disable(bdev);
+ break;
+ case BIODASDENABLE:
+ rc = dasd_ioctl_enable(bdev);
+ break;
+ case BIODASDQUIESCE:
+ rc = dasd_ioctl_quiesce(block);
+ break;
+ case BIODASDRESUME:
+ rc = dasd_ioctl_resume(block);
+ break;
+ case BIODASDABORTIO:
+ rc = dasd_ioctl_abortio(block);
+ break;
+ case BIODASDALLOWIO:
+ rc = dasd_ioctl_allowio(block);
+ break;
+ case BIODASDFMT:
+ rc = dasd_ioctl_format(bdev, argp);
+ break;
+ case BIODASDINFO:
+ rc = dasd_ioctl_information(block, cmd, argp);
+ break;
+ case BIODASDINFO2:
+ rc = dasd_ioctl_information(block, cmd, argp);
+ break;
+ case BIODASDPRRD:
+ rc = dasd_ioctl_read_profile(block, argp);
+ break;
+ case BIODASDPRRST:
+ rc = dasd_ioctl_reset_profile(block);
+ break;
+ case BLKROSET:
+ rc = dasd_ioctl_set_ro(bdev, argp);
+ break;
+ case DASDAPIVER:
+ rc = dasd_ioctl_api_version(argp);
+ break;
+ case BIODASDCMFENABLE:
+ rc = enable_cmf(base->cdev);
+ break;
+ case BIODASDCMFDISABLE:
+ rc = disable_cmf(base->cdev);
+ break;
+ case BIODASDREADALLCMB:
+ rc = dasd_ioctl_readall_cmb(block, cmd, argp);
+ break;
+ default:
+ /* if the discipline has an ioctl method try it. */
+ rc = -ENOTTY;
+ if (base->discipline->ioctl)
+ rc = base->discipline->ioctl(block, cmd, argp);
+ }
+ dasd_put_device(base);
+ return rc;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-26 04:51:55 +0000