diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/s390/block/dasd_ioctl.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/s390/block/dasd_ioctl.c')
-rw-r--r-- | drivers/s390/block/dasd_ioctl.c | 554 |
1 files changed, 554 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c new file mode 100644 index 000000000000..f1892baa3b18 --- /dev/null +++ b/drivers/s390/block/dasd_ioctl.c @@ -0,0 +1,554 @@ +/* + * File...........: linux/drivers/s390/block/dasd_ioctl.c + * 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> + * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 + * + * i/o controls for the dasd driver. + */ +#include <linux/config.h> +#include <linux/interrupt.h> +#include <linux/major.h> +#include <linux/fs.h> +#include <linux/blkpg.h> + +#include <asm/ccwdev.h> +#include <asm/uaccess.h> + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_ioctl:" + +#include "dasd_int.h" + +/* + * SECTION: ioctl functions. + */ +static struct list_head dasd_ioctl_list = LIST_HEAD_INIT(dasd_ioctl_list); + +/* + * Find the ioctl with number no. + */ +static struct dasd_ioctl * +dasd_find_ioctl(int no) +{ + struct dasd_ioctl *ioctl; + + list_for_each_entry (ioctl, &dasd_ioctl_list, list) + if (ioctl->no == no) + return ioctl; + return NULL; +} + +/* + * Register ioctl with number no. + */ +int +dasd_ioctl_no_register(struct module *owner, int no, dasd_ioctl_fn_t handler) +{ + struct dasd_ioctl *new; + if (dasd_find_ioctl(no)) + return -EBUSY; + new = kmalloc(sizeof (struct dasd_ioctl), GFP_KERNEL); + if (new == NULL) + return -ENOMEM; + new->owner = owner; + new->no = no; + new->handler = handler; + list_add(&new->list, &dasd_ioctl_list); + return 0; +} + +/* + * Deregister ioctl with number no. + */ +int +dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler) +{ + struct dasd_ioctl *old = dasd_find_ioctl(no); + if (old == NULL) + return -ENOENT; + if (old->no != no || old->handler != handler || owner != old->owner) + return -EINVAL; + list_del(&old->list); + kfree(old); + return 0; +} + +int +dasd_ioctl(struct inode *inp, struct file *filp, + unsigned int no, unsigned long data) +{ + struct block_device *bdev = inp->i_bdev; + struct dasd_device *device = bdev->bd_disk->private_data; + struct dasd_ioctl *ioctl; + const char *dir; + int rc; + + if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) { + PRINT_DEBUG("empty data ptr"); + return -EINVAL; + } + dir = _IOC_DIR (no) == _IOC_NONE ? "0" : + _IOC_DIR (no) == _IOC_READ ? "r" : + _IOC_DIR (no) == _IOC_WRITE ? "w" : + _IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u"; + DBF_DEV_EVENT(DBF_DEBUG, device, + "ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no, + dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data); + /* Search for ioctl no in the ioctl list. */ + list_for_each_entry(ioctl, &dasd_ioctl_list, list) { + if (ioctl->no == no) { + /* Found a matching ioctl. Call it. */ + if (!try_module_get(ioctl->owner)) + continue; + rc = ioctl->handler(bdev, no, data); + module_put(ioctl->owner); + return rc; + } + } + /* No ioctl with number no. */ + DBF_DEV_EVENT(DBF_INFO, device, + "unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no, + dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data); + return -EINVAL; +} + +static int +dasd_ioctl_api_version(struct block_device *bdev, int no, long args) +{ + int ver = DASD_API_VERSION; + return put_user(ver, (int __user *) args); +} + +/* + * Enable device. + * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection + */ +static int +dasd_ioctl_enable(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + dasd_enable_device(device); + /* Formatting the dasd device can change the capacity. */ + down(&bdev->bd_sem); + i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9); + up(&bdev->bd_sem); + return 0; +} + +/* + * Disable device. + * Used by dasdfmt. Disable I/O operations but allow ioctls. + */ +static int +dasd_ioctl_disable(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + device = bdev->bd_disk->private_data; + if (device == NULL) + 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(device, DASD_STATE_BASIC); + /* + * Set i_size to zero, since read, write, etc. check against this + * value. + */ + down(&bdev->bd_sem); + i_size_write(bdev->bd_inode, 0); + up(&bdev->bd_sem); + return 0; +} + +/* + * Quiesce device. + */ +static int +dasd_ioctl_quiesce(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + unsigned long flags; + + if (!capable (CAP_SYS_ADMIN)) + return -EACCES; + + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + + DEV_MESSAGE (KERN_DEBUG, device, "%s", + "Quiesce IO on device"); + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + device->stopped |= DASD_STOPPED_QUIESCE; + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + return 0; +} + + +/* + * Quiesce device. + */ +static int +dasd_ioctl_resume(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + unsigned long flags; + + if (!capable (CAP_SYS_ADMIN)) + return -EACCES; + + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + + DEV_MESSAGE (KERN_DEBUG, device, "%s", + "resume IO on device"); + + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + device->stopped &= ~DASD_STOPPED_QUIESCE; + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + + dasd_schedule_bh (device); + return 0; +} + +/* + * performs formatting of _device_ according to _fdata_ + * Note: The discipline's format_function is assumed to deliver formatting + * commands to format a single unit of the device. In terms of the ECKD + * devices this means CCWs are generated to format a single track. + */ +static int +dasd_format(struct dasd_device * device, struct format_data_t * fdata) +{ + struct dasd_ccw_req *cqr; + int rc; + + if (device->discipline->format_device == NULL) + return -EPERM; + + if (device->state != DASD_STATE_BASIC) { + DEV_MESSAGE(KERN_WARNING, device, "%s", + "dasd_format: device is not disabled! "); + return -EBUSY; + } + + DBF_DEV_EVENT(DBF_NOTICE, device, + "formatting units %d to %d (%d B blocks) flags %d", + 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(device->gdp, 0); + bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); + bdput(bdev); + } + + while (fdata->start_unit <= fdata->stop_unit) { + cqr = device->discipline->format_device(device, fdata); + if (IS_ERR(cqr)) + return PTR_ERR(cqr); + rc = dasd_sleep_on_interruptible(cqr); + dasd_sfree_request(cqr, cqr->device); + if (rc) { + if (rc != -ERESTARTSYS) + DEV_MESSAGE(KERN_ERR, device, + " Formatting of unit %d failed " + "with rc = %d", + fdata->start_unit, rc); + return rc; + } + fdata->start_unit++; + } + return 0; +} + +/* + * Format device. + */ +static int +dasd_ioctl_format(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + struct format_data_t fdata; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (!args) + return -EINVAL; + /* fdata == NULL is no longer a valid arg to dasd_format ! */ + device = bdev->bd_disk->private_data; + + if (device == NULL) + return -ENODEV; + if (test_bit(DASD_FLAG_RO, &device->flags)) + return -EROFS; + if (copy_from_user(&fdata, (void __user *) args, + sizeof (struct format_data_t))) + return -EFAULT; + if (bdev != bdev->bd_contains) { + DEV_MESSAGE(KERN_WARNING, device, "%s", + "Cannot low-level format a partition"); + return -EINVAL; + } + return dasd_format(device, &fdata); +} + +#ifdef CONFIG_DASD_PROFILE +/* + * Reset device profile information + */ +static int +dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + + memset(&device->profile, 0, sizeof (struct dasd_profile_info_t)); + return 0; +} + +/* + * Return device profile information + */ +static int +dasd_ioctl_read_profile(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + + if (copy_to_user((long __user *) args, (long *) &device->profile, + sizeof (struct dasd_profile_info_t))) + return -EFAULT; + return 0; +} +#else +static int +dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args) +{ + return -ENOSYS; +} + +static int +dasd_ioctl_read_profile(struct block_device *bdev, int no, long args) +{ + return -ENOSYS; +} +#endif + +/* + * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. + */ +static int +dasd_ioctl_information(struct block_device *bdev, int no, long args) +{ + struct dasd_device *device; + struct dasd_information2_t *dasd_info; + unsigned long flags; + int rc; + struct ccw_device *cdev; + + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + + if (!device->discipline->fill_info) + return -EINVAL; + + dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); + if (dasd_info == NULL) + return -ENOMEM; + + rc = device->discipline->fill_info(device, dasd_info); + if (rc) { + kfree(dasd_info); + return rc; + } + + cdev = device->cdev; + + dasd_info->devno = _ccw_device_get_device_number(device->cdev); + dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev); + 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->open_count = atomic_read(&device->open_count); + dasd_info->status = device->state; + + /* + * check if device is really formatted + * LDL / CDL was returned by 'fill_info' + */ + if ((device->state < DASD_STATE_READY) || + (dasd_check_blocksize(device->bp_block))) + dasd_info->format = DASD_FORMAT_NONE; + + dasd_info->features |= test_bit(DASD_FLAG_RO, &device->flags) ? + DASD_FEATURE_READONLY : DASD_FEATURE_DEFAULT; + + if (device->discipline) + memcpy(dasd_info->type, device->discipline->name, 4); + else + memcpy(dasd_info->type, "none", 4); + dasd_info->req_queue_len = 0; + dasd_info->chanq_len = 0; + if (device->request_queue->request_fn) { + struct list_head *l; +#ifdef DASD_EXTENDED_PROFILING + { + struct list_head *l; + spin_lock_irqsave(&device->lock, flags); + list_for_each(l, &device->request_queue->queue_head) + dasd_info->req_queue_len++; + spin_unlock_irqrestore(&device->lock, flags); + } +#endif /* DASD_EXTENDED_PROFILING */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + list_for_each(l, &device->ccw_queue) + dasd_info->chanq_len++; + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), + flags); + } + + rc = 0; + if (copy_to_user((long __user *) args, (long *) dasd_info, + ((no == (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, int no, long args) +{ + struct dasd_device *device; + int intval; + + 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 *) args)) + return -EFAULT; + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + set_disk_ro(bdev->bd_disk, intval); + if (intval) + set_bit(DASD_FLAG_RO, &device->flags); + else + clear_bit(DASD_FLAG_RO, &device->flags); + return 0; +} + +/* + * Return disk geometry. + */ +static int +dasd_ioctl_getgeo(struct block_device *bdev, int no, long args) +{ + struct hd_geometry geo = { 0, }; + struct dasd_device *device; + + device = bdev->bd_disk->private_data; + if (device == NULL) + return -ENODEV; + + if (device == NULL || device->discipline == NULL || + device->discipline->fill_geometry == NULL) + return -EINVAL; + + geo = (struct hd_geometry) {}; + device->discipline->fill_geometry(device, &geo); + geo.start = get_start_sect(bdev) >> device->s2b_shift; + if (copy_to_user((struct hd_geometry __user *) args, &geo, + sizeof (struct hd_geometry))) + return -EFAULT; + + return 0; +} + +/* + * List of static ioctls. + */ +static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] = +{ + { BIODASDDISABLE, dasd_ioctl_disable }, + { BIODASDENABLE, dasd_ioctl_enable }, + { BIODASDQUIESCE, dasd_ioctl_quiesce }, + { BIODASDRESUME, dasd_ioctl_resume }, + { BIODASDFMT, dasd_ioctl_format }, + { BIODASDINFO, dasd_ioctl_information }, + { BIODASDINFO2, dasd_ioctl_information }, + { BIODASDPRRD, dasd_ioctl_read_profile }, + { BIODASDPRRST, dasd_ioctl_reset_profile }, + { BLKROSET, dasd_ioctl_set_ro }, + { DASDAPIVER, dasd_ioctl_api_version }, + { HDIO_GETGEO, dasd_ioctl_getgeo }, + { -1, NULL } +}; + +int +dasd_ioctl_init(void) +{ + int i; + + for (i = 0; dasd_ioctls[i].no != -1; i++) + dasd_ioctl_no_register(NULL, dasd_ioctls[i].no, + dasd_ioctls[i].fn); + return 0; + +} + +void +dasd_ioctl_exit(void) +{ + int i; + + for (i = 0; dasd_ioctls[i].no != -1; i++) + dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no, + dasd_ioctls[i].fn); + +} + +EXPORT_SYMBOL(dasd_ioctl_no_register); +EXPORT_SYMBOL(dasd_ioctl_no_unregister); |