cregit-Linux how code gets into the kernel

Release 4.10 drivers/s390/block/dasd_genhd.c

Directory: drivers/s390/block
/*
 * 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
 *
 * gendisk related functions for the dasd driver.
 *
 */


#define KMSG_COMPONENT "dasd"

#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/blkpg.h>

#include <linux/uaccess.h>

/* This is ugly... */

#define PRINTK_HEADER "dasd_gendisk:"

#include "dasd_int.h"

/*
 * 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;

	/*
         * 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);
	dasd_add_link_to_gendisk(gdp, base);
	gdp->queue = block->request_queue;
	block->gdp = gdp;
	set_capacity(block->gdp, 0);
	device_add_disk(&base->cdev->dev, block->gdp);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
andrew mortonandrew morton14145.19%17.69%


martin schwidefskymartin schwidefsky10934.94%538.46%


stefan weinhuberstefan weinhuber4313.78%323.08%


dan williamsdan williams82.56%17.69%


al viroal viro72.24%215.38%


horst hummelhorst hummel41.28%17.69%


Total312100.00%13100.00%



/*
 * Unregister and free gendisk structure for device.
 */



void dasd_gendisk_free(struct dasd_block *block)
{
	if (block->gdp) {
		del_gendisk(block->gdp);
		block->gdp->private_data = NULL;
		put_disk(block->gdp);
		block->gdp = NULL;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky2656.52%450.00%


stefan weinhuberstefan weinhuber817.39%112.50%


horst hummelhorst hummel715.22%112.50%


stefan haberlandstefan haberland48.70%112.50%


heiko carstensheiko carstens12.17%112.50%


Total46100.00%8100.00%



/*
 * Trigger a partition detection.
 */



int dasd_scan_partitions(struct dasd_block *block)
{
	struct block_device *bdev;
	int rc;

	bdev = bdget_disk(block->gdp, 0);
	if (!bdev) {
		DBF_DEV_EVENT(DBF_ERR, block->base, "%s",
			      "scan partitions error, bdget returned NULL");
		return -ENODEV;
	}

	rc = blkdev_get(bdev, FMODE_READ, NULL);
	if (rc < 0) {
		DBF_DEV_EVENT(DBF_ERR, block->base,
			      "scan partitions error, blkdev_get returned %d",
			      rc);
		return -ENODEV;
	}

	rc = blkdev_reread_part(bdev);
	if (rc)
		DBF_DEV_EVENT(DBF_ERR, block->base,
				"scan partitions error, rc %d", rc);

	/*
         * Since the matching blkdev_put call to the blkdev_get in
         * this function is not called before dasd_destroy_partitions
         * the offline open_count limit needs to be increased from
         * 0 to 1. This is done by setting device->bdev (see
         * dasd_generic_set_offline). As long as the partition
         * detection is running no offline should be allowed. That
         * is why the assignment to device->bdev is done AFTER
         * the BLKRRPART ioctl.
         */
	block->bdev = bdev;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
stefan haberlandstefan haberland6149.59%18.33%


martin schwidefskymartin schwidefsky3024.39%325.00%


andrew mortonandrew morton1310.57%18.33%


al viroal viro97.32%325.00%


stefan weinhuberstefan weinhuber54.07%18.33%


tejun heotejun heo21.63%18.33%


jarod wilsonjarod wilson21.63%18.33%


ming leiming lei10.81%18.33%


Total123100.00%12100.00%



/*
 * Remove all inodes in the system for a device, delete the
 * partitions and make device unusable by setting its size to zero.
 */



void dasd_destroy_partitions(struct dasd_block *block)
{
	/* The two structs have 168/176 byte on 31/64 bit. */
	struct blkpg_partition bpart;
	struct blkpg_ioctl_arg barg;
	struct block_device *bdev;

	/*
         * Get the bdev pointer from the device structure and clear
         * device->bdev to lower the offline open_count limit again.
         */
	bdev = block->bdev;
	block->bdev = NULL;

	/*
         * See fs/partition/check.c:delete_partition
         * Can't call delete_partitions directly. Use ioctl.
         * The ioctl also does locking and invalidation.
         */
	memset(&bpart, 0, sizeof(struct blkpg_partition));
	memset(&barg, 0, sizeof(struct blkpg_ioctl_arg));
	barg.data = (void __force __user *) &bpart;
	barg.op = BLKPG_DEL_PARTITION;
	for (bpart.pno = block->gdp->minors - 1; bpart.pno > 0; bpart.pno--)
		ioctl_by_bdev(bdev, BLKPG, (unsigned long) &barg);

	invalidate_partition(block->gdp, 0);
	/* Matching blkdev_put to the blkdev_get in dasd_scan_partitions. */
	blkdev_put(bdev, FMODE_READ);
	set_capacity(block->gdp, 0);
}


Contributors
PersonTokensPropCommitsCommitProp
andrew mortonandrew morton7852.00%19.09%


martin schwidefskymartin schwidefsky4832.00%436.36%


stefan weinhuberstefan weinhuber85.33%19.09%


heiko carstensheiko carstens74.67%218.18%


al viroal viro53.33%218.18%


joe kortyjoe korty42.67%19.09%


Total150100.00%11100.00%






int dasd_gendisk_init(void)
{
	int rc;

	/* Register to static dasd major 94 */
	rc = register_blkdev(DASD_MAJOR, "dasd");
	if (rc != 0) {
		pr_warn("Registering the device driver with major number %d failed\n",
			DASD_MAJOR);
		return rc;
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky3892.68%360.00%


joe perchesjoe perches24.88%120.00%


stefan weinhuberstefan weinhuber12.44%120.00%


Total41100.00%5100.00%






void dasd_gendisk_exit(void)
{
	unregister_blkdev(DASD_MAJOR, "dasd");
}

Contributors
PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky1392.86%266.67%


stefan weinhuberstefan weinhuber17.14%133.33%


Total14100.00%3100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
martin schwidefskymartin schwidefsky28740.14%720.59%


andrew mortonandrew morton23232.45%25.88%


stefan haberlandstefan haberland699.65%38.82%


stefan weinhuberstefan weinhuber669.23%38.82%


al viroal viro212.94%720.59%


horst hummelhorst hummel111.54%25.88%


heiko carstensheiko carstens91.26%38.82%


dan williamsdan williams81.12%12.94%


joe kortyjoe korty40.56%12.94%


tejun heotejun heo20.28%12.94%


joe perchesjoe perches20.28%12.94%


jarod wilsonjarod wilson20.28%12.94%


ming leiming lei10.14%12.94%


linus torvaldslinus torvalds10.14%12.94%


Total715100.00%34100.00%


Directory: drivers/s390/block



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