^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Horst Hummel <Horst.Hummel@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Carsten Otte <Cotte@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Martin Schwidefsky <schwidefsky@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Bugreports.to..: <Linux390@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright IBM Corp. 1999, 2001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * gendisk related functions for the dasd driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define KMSG_COMPONENT "dasd"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/blkpg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* This is ugly... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define PRINTK_HEADER "dasd_gendisk:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "dasd_int.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Allocate and register gendisk structure for device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int dasd_gendisk_alloc(struct dasd_block *block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct gendisk *gdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct dasd_device *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /* Make sure the minor for this device exists. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) base = block->base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (base->devindex >= DASD_PER_MAJOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) gdp = alloc_disk(1 << DASD_PARTN_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (!gdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* Initialize gendisk structure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) gdp->major = DASD_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) gdp->first_minor = base->devindex << DASD_PARTN_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) gdp->fops = &dasd_device_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * Set device name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * dasda - dasdz : 26 devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * dasdaa - dasdzz : 676 devices, added up = 702
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * dasdaaa - dasdzzz : 17576 devices, added up = 18278
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * dasdaaaa - dasdzzzz : 456976 devices, added up = 475252
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) len = sprintf(gdp->disk_name, "dasd");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (base->devindex > 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (base->devindex > 701) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (base->devindex > 18277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) len += sprintf(gdp->disk_name + len, "%c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 'a'+(((base->devindex-18278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /17576)%26));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) len += sprintf(gdp->disk_name + len, "%c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 'a'+(((base->devindex-702)/676)%26));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) len += sprintf(gdp->disk_name + len, "%c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 'a'+(((base->devindex-26)/26)%26));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) len += sprintf(gdp->disk_name + len, "%c", 'a'+(base->devindex%26));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (base->features & DASD_FEATURE_READONLY ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) set_disk_ro(gdp, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) dasd_add_link_to_gendisk(gdp, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) gdp->queue = block->request_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) block->gdp = gdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) set_capacity(block->gdp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) device_add_disk(&base->cdev->dev, block->gdp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Unregister and free gendisk structure for device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) void dasd_gendisk_free(struct dasd_block *block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (block->gdp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) del_gendisk(block->gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) block->gdp->private_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) put_disk(block->gdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) block->gdp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * Trigger a partition detection.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) int dasd_scan_partitions(struct dasd_block *block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct block_device *bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) bdev = blkdev_get_by_dev(disk_devt(block->gdp), FMODE_READ, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (IS_ERR(bdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) DBF_DEV_EVENT(DBF_ERR, block->base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) "scan partitions error, blkdev_get returned %ld",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) PTR_ERR(bdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) mutex_lock(&bdev->bd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) rc = bdev_disk_changed(bdev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) mutex_unlock(&bdev->bd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) DBF_DEV_EVENT(DBF_ERR, block->base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) "scan partitions error, rc %d", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * Since the matching blkdev_put call to the blkdev_get in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * this function is not called before dasd_destroy_partitions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * the offline open_count limit needs to be increased from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * 0 to 1. This is done by setting device->bdev (see
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * dasd_generic_set_offline). As long as the partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * detection is running no offline should be allowed. That
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * is why the assignment to device->bdev is done AFTER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * the BLKRRPART ioctl.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) block->bdev = bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * Remove all inodes in the system for a device, delete the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * partitions and make device unusable by setting its size to zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) void dasd_destroy_partitions(struct dasd_block *block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct block_device *bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * Get the bdev pointer from the device structure and clear
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * device->bdev to lower the offline open_count limit again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) bdev = block->bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) block->bdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) mutex_lock(&bdev->bd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) blk_drop_partitions(bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) mutex_unlock(&bdev->bd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /* Matching blkdev_put to the blkdev_get in dasd_scan_partitions. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) blkdev_put(bdev, FMODE_READ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) set_capacity(block->gdp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) int dasd_gendisk_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* Register to static dasd major 94 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) rc = register_blkdev(DASD_MAJOR, "dasd");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (rc != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) pr_warn("Registering the device driver with major number %d failed\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) DASD_MAJOR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) void dasd_gendisk_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) unregister_blkdev(DASD_MAJOR, "dasd");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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