Esempio n. 1
0
File: zvol.c Progetto: alek-p/zfs
static int
zvol_first_open(zvol_state_t *zv)
{
	objset_t *os;
	uint64_t volsize;
	int error;
	uint64_t ro;

	/* lie and say we're read-only */
	error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, 1, zvol_tag, &os);
	if (error)
		return (SET_ERROR(-error));

	zv->zv_objset = os;

	error = dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL);
	if (error)
		goto out_owned;

	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
	if (error)
		goto out_owned;

	error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf);
	if (error)
		goto out_owned;

	set_capacity(zv->zv_disk, volsize >> 9);
	zv->zv_volsize = volsize;
	zv->zv_zilog = zil_open(os, zvol_get_data);

	if (ro || dmu_objset_is_snapshot(os) ||
	    !spa_writeable(dmu_objset_spa(os))) {
		set_disk_ro(zv->zv_disk, 1);
		zv->zv_flags |= ZVOL_RDONLY;
	} else {
		set_disk_ro(zv->zv_disk, 0);
		zv->zv_flags &= ~ZVOL_RDONLY;
	}

out_owned:
	if (error) {
		dmu_objset_disown(os, zvol_tag);
		zv->zv_objset = NULL;
	}

	return (SET_ERROR(-error));
}
Esempio n. 2
0
/*
 * 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;
}
Esempio n. 3
0
static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive,
					     struct ide_atapi_pc *pc)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	struct gendisk *disk = floppy->disk;
	u8 *page, buf[40];
	int capacity, lba_capacity;
	u16 transfer_rate, sector_size, cyls, rpm;
	u8 heads, sectors;

	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);

	if (ide_queue_pc_tail(drive, disk, pc, buf, pc->req_xfer)) {
		printk(KERN_ERR PFX "Can't get flexible disk page params\n");
		return 1;
	}

	if (buf[3] & 0x80)
		drive->dev_flags |= IDE_DFLAG_WP;
	else
		drive->dev_flags &= ~IDE_DFLAG_WP;

	set_disk_ro(disk, !!(drive->dev_flags & IDE_DFLAG_WP));

	page = &buf[8];

	transfer_rate = be16_to_cpup((__be16 *)&buf[8 + 2]);
	sector_size   = be16_to_cpup((__be16 *)&buf[8 + 6]);
	cyls          = be16_to_cpup((__be16 *)&buf[8 + 8]);
	rpm           = be16_to_cpup((__be16 *)&buf[8 + 28]);
	heads         = buf[8 + 4];
	sectors       = buf[8 + 5];

	capacity = cyls * heads * sectors * sector_size;

	if (memcmp(page, &floppy->flexible_disk_page, 32))
		printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
				"%d sector size, %d rpm\n",
				drive->name, capacity / 1024, cyls, heads,
				sectors, transfer_rate / 8, sector_size, rpm);

	memcpy(&floppy->flexible_disk_page, page, 32);
	drive->bios_cyl = cyls;
	drive->bios_head = heads;
	drive->bios_sect = sectors;
	lba_capacity = floppy->blocks * floppy->block_size;

	if (capacity < lba_capacity) {
		printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
			"bytes, but the drive only handles %d\n",
			drive->name, lba_capacity, capacity);
		floppy->blocks = floppy->block_size ?
			capacity / floppy->block_size : 0;
		drive->capacity64 = floppy->blocks * floppy->bs_factor;
	}

	return 0;
}
Esempio n. 4
0
File: zvol.c Progetto: alek-p/zfs
/*
 * Rename a block device minor mode for the specified volume.
 */
static void
zvol_rename_minor(zvol_state_t *zv, const char *newname)
{
	int readonly = get_disk_ro(zv->zv_disk);

	ASSERT(MUTEX_HELD(&zvol_state_lock));

	strlcpy(zv->zv_name, newname, sizeof (zv->zv_name));

	/*
	 * The block device's read-only state is briefly changed causing
	 * a KOBJ_CHANGE uevent to be issued.  This ensures udev detects
	 * the name change and fixes the symlinks.  This does not change
	 * ZVOL_RDONLY in zv->zv_flags so the actual read-only state never
	 * changes.  This would normally be done using kobject_uevent() but
	 * that is a GPL-only symbol which is why we need this workaround.
	 */
	set_disk_ro(zv->zv_disk, !readonly);
	set_disk_ro(zv->zv_disk, readonly);
}
Esempio n. 5
0
/*
 * Allocate and register gendisk structure for device.
 */
int dasd_gendisk_alloc(struct dasd_block *block)
{
	struct gendisk *gdp;
	struct dasd_device *base;
	int len;

	/* Make sure the minor for this device exists. */
	base = block->base;
	if (base->devindex >= DASD_PER_MAJOR)
		return -EBUSY;

	gdp = alloc_disk(1 << DASD_PARTN_BITS);
	if (!gdp)
		return -ENOMEM;

	/* Initialize gendisk structure. */
	gdp->major = DASD_MAJOR;
	gdp->first_minor = base->devindex << DASD_PARTN_BITS;
	gdp->fops = &dasd_device_operations;
	gdp->driverfs_dev = &base->cdev->dev;

	/*
	 * Set device name.
	 *   dasda - dasdz : 26 devices
	 *   dasdaa - dasdzz : 676 devices, added up = 702
	 *   dasdaaa - dasdzzz : 17576 devices, added up = 18278
	 *   dasdaaaa - dasdzzzz : 456976 devices, added up = 475252
	 */
	len = sprintf(gdp->disk_name, "dasd");
	if (base->devindex > 25) {
		if (base->devindex > 701) {
			if (base->devindex > 18277)
			        len += sprintf(gdp->disk_name + len, "%c",
					       'a'+(((base->devindex-18278)
						     /17576)%26));
			len += sprintf(gdp->disk_name + len, "%c",
				       'a'+(((base->devindex-702)/676)%26));
		}
		len += sprintf(gdp->disk_name + len, "%c",
			       'a'+(((base->devindex-26)/26)%26));
	}
	len += sprintf(gdp->disk_name + len, "%c", 'a'+(base->devindex%26));

	if (base->features & DASD_FEATURE_READONLY ||
	    test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
		set_disk_ro(gdp, 1);
	gdp->private_data = block;
	gdp->queue = block->request_queue;
	block->gdp = gdp;
	set_capacity(block->gdp, 0);
	add_disk(block->gdp);
	return 0;
}
Esempio n. 6
0
/*
 * Allocate and register gendisk structure for device.
 */
int
dasd_gendisk_alloc(struct dasd_device *device)
{
	struct gendisk *gdp;
	int len;

	/* Make sure the minor for this device exists. */
	if (device->devindex >= DASD_PER_MAJOR)
		return -EBUSY;

	gdp = alloc_disk(1 << DASD_PARTN_BITS);
	if (!gdp)
		return -ENOMEM;

	/* Initialize gendisk structure. */
	gdp->major = DASD_MAJOR;
	gdp->first_minor = device->devindex << DASD_PARTN_BITS;
	gdp->fops = &dasd_device_operations;
	gdp->driverfs_dev = &device->cdev->dev;

	/*
	 * Set device name.
	 *   dasda - dasdz : 26 devices
	 *   dasdaa - dasdzz : 676 devices, added up = 702
	 *   dasdaaa - dasdzzz : 17576 devices, added up = 18278
	 *   dasdaaaa - dasdzzzz : 456976 devices, added up = 475252
	 */
	len = sprintf(gdp->disk_name, "dasd");
	if (device->devindex > 25) {
	        if (device->devindex > 701) {
		        if (device->devindex > 18277)
			        len += sprintf(gdp->disk_name + len, "%c",
					       'a'+(((device->devindex-18278)
						     /17576)%26));
			len += sprintf(gdp->disk_name + len, "%c",
				       'a'+(((device->devindex-702)/676)%26));
		}
		len += sprintf(gdp->disk_name + len, "%c",
			       'a'+(((device->devindex-26)/26)%26));
	}
	len += sprintf(gdp->disk_name + len, "%c", 'a'+(device->devindex%26));

 	sprintf(gdp->devfs_name, "dasd/%s", device->cdev->dev.bus_id);

	if (test_bit(DASD_FLAG_RO, &device->flags))
		set_disk_ro(gdp, 1);
	gdp->private_data = device;
	gdp->queue = device->request_queue;
	device->gdp = gdp;
	set_capacity(device->gdp, 0);
	add_disk(device->gdp);
	return 0;
}
Esempio n. 7
0
/*
 * Set read only
 */
static int
dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
{
	struct dasd_block *block =  bdev->bd_disk->private_data;
	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 *)argp))
		return -EFAULT;

	set_disk_ro(bdev->bd_disk, intval);
	return dasd_set_feature(block->base->cdev, DASD_FEATURE_READONLY, intval);
}
Esempio n. 8
0
File: zvol.c Progetto: lycovian/zfs
static int
zvol_first_open(zvol_state_t *zv)
{
	objset_t *os;
	uint64_t volsize;
	int locked = 0;
	int error;
	uint64_t ro;

	/*
	 * In all other cases the spa_namespace_lock is taken before the
	 * bdev->bd_mutex lock.  But in this case the Linux __blkdev_get()
	 * function calls fops->open() with the bdev->bd_mutex lock held.
	 *
	 * To avoid a potential lock inversion deadlock we preemptively
	 * try to take the spa_namespace_lock().  Normally it will not
	 * be contended and this is safe because spa_open_common() handles
	 * the case where the caller already holds the spa_namespace_lock.
	 *
	 * When it is contended we risk a lock inversion if we were to
	 * block waiting for the lock.  Luckily, the __blkdev_get()
	 * function allows us to return -ERESTARTSYS which will result in
	 * bdev->bd_mutex being dropped, reacquired, and fops->open() being
	 * called again.  This process can be repeated safely until both
	 * locks are acquired.
	 */
	if (!mutex_owned(&spa_namespace_lock)) {
		locked = mutex_tryenter(&spa_namespace_lock);
		if (!locked)
			return (-ERESTARTSYS);
	}

	/* lie and say we're read-only */
	error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, 1, zvol_tag, &os);
	if (error)
		goto out_mutex;

	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
	if (error) {
		dmu_objset_disown(os, zvol_tag);
		goto out_mutex;
	}

	zv->zv_objset = os;
	error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf);
	if (error) {
		dmu_objset_disown(os, zvol_tag);
		goto out_mutex;
	}

	set_capacity(zv->zv_disk, volsize >> 9);
	zv->zv_volsize = volsize;
	zv->zv_zilog = zil_open(os, zvol_get_data);

	VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL) == 0);
	if (ro || dmu_objset_is_snapshot(os) ||
	    !spa_writeable(dmu_objset_spa(os))) {
		set_disk_ro(zv->zv_disk, 1);
		zv->zv_flags |= ZVOL_RDONLY;
	} else {
		set_disk_ro(zv->zv_disk, 0);
		zv->zv_flags &= ~ZVOL_RDONLY;
	}

out_mutex:
	if (locked)
		mutex_exit(&spa_namespace_lock);

	return (-error);
}
static void __init dm_setup_drive(void)
{
	struct mapped_device *md = NULL;
	struct dm_table *table = NULL;
	struct dm_setup_target *target;
	char *uuid = dm_setup_args.uuid;
	fmode_t fmode = FMODE_READ;

	/* Finish parsing the targets. */
	if (dm_setup_parse_targets(dm_setup_args.targets))
		goto parse_fail;

	if (dm_create(dm_setup_args.minor, &md)) {
		DMDEBUG("failed to create the device");
		goto dm_create_fail;
	}
	DMDEBUG("created device '%s'", dm_device_name(md));

	/* In addition to flagging the table below, the disk must be
	 * set explicitly ro/rw. */
	set_disk_ro(dm_disk(md), dm_setup_args.ro);

	if (!dm_setup_args.ro)
		fmode |= FMODE_WRITE;
	if (dm_table_create(&table, fmode, dm_setup_args.target_count, md)) {
		DMDEBUG("failed to create the table");
		goto dm_table_create_fail;
	}

	target = dm_setup_args.target;
	while (target) {
		DMINFO("adding target '%llu %llu %s %s'",
		       (unsigned long long) target->begin,
		       (unsigned long long) target->length, target->type,
		       target->params);
		if (dm_table_add_target(table, target->type, target->begin,
					target->length, target->params)) {
			DMDEBUG("failed to add the target to the table");
			goto add_target_fail;
		}
		target = target->next;
	}

	if (dm_table_complete(table)) {
		DMDEBUG("failed to complete the table");
		goto table_complete_fail;
	}

	/* Suspend the device so that we can bind it to the table. */
	if (dm_suspend(md, 0)) {
		DMDEBUG("failed to suspend the device pre-bind");
		goto suspend_fail;
	}

	/* Bind the table to the device. This is the only way to associate
	 * md->map with the table and set the disk capacity directly. */
	if (dm_swap_table(md, table)) {  /* should return NULL. */
		DMDEBUG("failed to bind the device to the table");
		goto table_bind_fail;
	}

	/* Finally, resume and the device should be ready. */
	if (dm_resume(md)) {
		DMDEBUG("failed to resume the device");
		goto resume_fail;
	}

	/* Export the dm device via the ioctl interface */
	if (!strcmp(DM_NO_UUID, dm_setup_args.uuid))
		uuid = NULL;
	if (dm_ioctl_export(md, dm_setup_args.name, uuid)) {
		DMDEBUG("failed to export device with given name and uuid");
		goto export_fail;
	}
	printk(KERN_INFO "dm: dm-%d is ready\n", dm_setup_args.minor);

	dm_setup_cleanup();
	return;

export_fail:
resume_fail:
table_bind_fail:
suspend_fail:
table_complete_fail:
add_target_fail:
	dm_table_put(table);
dm_table_create_fail:
	dm_put(md);
dm_create_fail:
	dm_setup_cleanup();
parse_fail:
	printk(KERN_WARNING "dm: starting dm-%d (%s) failed\n",
	       dm_setup_args.minor, dm_setup_args.name);
}