Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
3 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
4 | * Carsten Otte <Cotte@de.ibm.com> | |
5 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
6 | * Bugreports.to..: <Linux390@de.ibm.com> | |
a53c8fab | 7 | * Copyright IBM Corp. 1999, 2001 |
1da177e4 LT |
8 | * |
9 | * gendisk related functions for the dasd driver. | |
10 | * | |
1da177e4 LT |
11 | */ |
12 | ||
fc19f381 SH |
13 | #define KMSG_COMPONENT "dasd" |
14 | ||
1da177e4 LT |
15 | #include <linux/interrupt.h> |
16 | #include <linux/fs.h> | |
17 | #include <linux/blkpg.h> | |
18 | ||
19 | #include <asm/uaccess.h> | |
20 | ||
21 | /* This is ugly... */ | |
22 | #define PRINTK_HEADER "dasd_gendisk:" | |
23 | ||
24 | #include "dasd_int.h" | |
25 | ||
26 | /* | |
27 | * Allocate and register gendisk structure for device. | |
28 | */ | |
8e09f215 | 29 | int dasd_gendisk_alloc(struct dasd_block *block) |
1da177e4 LT |
30 | { |
31 | struct gendisk *gdp; | |
8e09f215 | 32 | struct dasd_device *base; |
c6eb7b77 | 33 | int len; |
1da177e4 LT |
34 | |
35 | /* Make sure the minor for this device exists. */ | |
8e09f215 SW |
36 | base = block->base; |
37 | if (base->devindex >= DASD_PER_MAJOR) | |
1da177e4 LT |
38 | return -EBUSY; |
39 | ||
40 | gdp = alloc_disk(1 << DASD_PARTN_BITS); | |
41 | if (!gdp) | |
42 | return -ENOMEM; | |
43 | ||
44 | /* Initialize gendisk structure. */ | |
45 | gdp->major = DASD_MAJOR; | |
8e09f215 | 46 | gdp->first_minor = base->devindex << DASD_PARTN_BITS; |
1da177e4 | 47 | gdp->fops = &dasd_device_operations; |
8e09f215 | 48 | gdp->driverfs_dev = &base->cdev->dev; |
1da177e4 LT |
49 | |
50 | /* | |
51 | * Set device name. | |
52 | * dasda - dasdz : 26 devices | |
53 | * dasdaa - dasdzz : 676 devices, added up = 702 | |
54 | * dasdaaa - dasdzzz : 17576 devices, added up = 18278 | |
55 | * dasdaaaa - dasdzzzz : 456976 devices, added up = 475252 | |
56 | */ | |
57 | len = sprintf(gdp->disk_name, "dasd"); | |
8e09f215 SW |
58 | if (base->devindex > 25) { |
59 | if (base->devindex > 701) { | |
60 | if (base->devindex > 18277) | |
1da177e4 | 61 | len += sprintf(gdp->disk_name + len, "%c", |
8e09f215 | 62 | 'a'+(((base->devindex-18278) |
1da177e4 LT |
63 | /17576)%26)); |
64 | len += sprintf(gdp->disk_name + len, "%c", | |
8e09f215 | 65 | 'a'+(((base->devindex-702)/676)%26)); |
1da177e4 LT |
66 | } |
67 | len += sprintf(gdp->disk_name + len, "%c", | |
8e09f215 | 68 | 'a'+(((base->devindex-26)/26)%26)); |
1da177e4 | 69 | } |
8e09f215 | 70 | len += sprintf(gdp->disk_name + len, "%c", 'a'+(base->devindex%26)); |
1da177e4 | 71 | |
33b62a30 SW |
72 | if (base->features & DASD_FEATURE_READONLY || |
73 | test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) | |
1da177e4 | 74 | set_disk_ro(gdp, 1); |
65f8da47 | 75 | dasd_add_link_to_gendisk(gdp, base); |
8e09f215 SW |
76 | gdp->queue = block->request_queue; |
77 | block->gdp = gdp; | |
78 | set_capacity(block->gdp, 0); | |
79 | add_disk(block->gdp); | |
1da177e4 LT |
80 | return 0; |
81 | } | |
82 | ||
83 | /* | |
84 | * Unregister and free gendisk structure for device. | |
85 | */ | |
8e09f215 | 86 | void dasd_gendisk_free(struct dasd_block *block) |
1da177e4 | 87 | { |
8e09f215 SW |
88 | if (block->gdp) { |
89 | del_gendisk(block->gdp); | |
9eb25122 | 90 | block->gdp->private_data = NULL; |
8e09f215 SW |
91 | put_disk(block->gdp); |
92 | block->gdp = NULL; | |
8f61701b | 93 | } |
1da177e4 LT |
94 | } |
95 | ||
96 | /* | |
97 | * Trigger a partition detection. | |
98 | */ | |
8e09f215 | 99 | int dasd_scan_partitions(struct dasd_block *block) |
1da177e4 LT |
100 | { |
101 | struct block_device *bdev; | |
102 | ||
8e09f215 | 103 | bdev = bdget_disk(block->gdp, 0); |
e525fd89 | 104 | if (!bdev || blkdev_get(bdev, FMODE_READ, NULL) < 0) |
1da177e4 LT |
105 | return -ENODEV; |
106 | /* | |
107 | * See fs/partition/check.c:register_disk,rescan_partitions | |
108 | * Can't call rescan_partitions directly. Use ioctl. | |
109 | */ | |
110 | ioctl_by_bdev(bdev, BLKRRPART, 0); | |
111 | /* | |
112 | * Since the matching blkdev_put call to the blkdev_get in | |
113 | * this function is not called before dasd_destroy_partitions | |
114 | * the offline open_count limit needs to be increased from | |
115 | * 0 to 1. This is done by setting device->bdev (see | |
116 | * dasd_generic_set_offline). As long as the partition | |
117 | * detection is running no offline should be allowed. That | |
118 | * is why the assignment to device->bdev is done AFTER | |
119 | * the BLKRRPART ioctl. | |
120 | */ | |
8e09f215 | 121 | block->bdev = bdev; |
1da177e4 LT |
122 | return 0; |
123 | } | |
124 | ||
125 | /* | |
126 | * Remove all inodes in the system for a device, delete the | |
127 | * partitions and make device unusable by setting its size to zero. | |
128 | */ | |
8e09f215 | 129 | void dasd_destroy_partitions(struct dasd_block *block) |
1da177e4 LT |
130 | { |
131 | /* The two structs have 168/176 byte on 31/64 bit. */ | |
132 | struct blkpg_partition bpart; | |
133 | struct blkpg_ioctl_arg barg; | |
134 | struct block_device *bdev; | |
135 | ||
136 | /* | |
137 | * Get the bdev pointer from the device structure and clear | |
138 | * device->bdev to lower the offline open_count limit again. | |
139 | */ | |
8e09f215 SW |
140 | bdev = block->bdev; |
141 | block->bdev = NULL; | |
1da177e4 LT |
142 | |
143 | /* | |
144 | * See fs/partition/check.c:delete_partition | |
145 | * Can't call delete_partitions directly. Use ioctl. | |
146 | * The ioctl also does locking and invalidation. | |
147 | */ | |
148 | memset(&bpart, 0, sizeof(struct blkpg_partition)); | |
149 | memset(&barg, 0, sizeof(struct blkpg_ioctl_arg)); | |
2b67fc46 | 150 | barg.data = (void __force __user *) &bpart; |
1da177e4 | 151 | barg.op = BLKPG_DEL_PARTITION; |
8e09f215 | 152 | for (bpart.pno = block->gdp->minors - 1; bpart.pno > 0; bpart.pno--) |
1da177e4 LT |
153 | ioctl_by_bdev(bdev, BLKPG, (unsigned long) &barg); |
154 | ||
8e09f215 | 155 | invalidate_partition(block->gdp, 0); |
1da177e4 | 156 | /* Matching blkdev_put to the blkdev_get in dasd_scan_partitions. */ |
9a1c3542 | 157 | blkdev_put(bdev, FMODE_READ); |
8e09f215 | 158 | set_capacity(block->gdp, 0); |
1da177e4 LT |
159 | } |
160 | ||
8e09f215 | 161 | int dasd_gendisk_init(void) |
1da177e4 LT |
162 | { |
163 | int rc; | |
164 | ||
165 | /* Register to static dasd major 94 */ | |
166 | rc = register_blkdev(DASD_MAJOR, "dasd"); | |
167 | if (rc != 0) { | |
fc19f381 SH |
168 | pr_warning("Registering the device driver with major number " |
169 | "%d failed\n", DASD_MAJOR); | |
1da177e4 LT |
170 | return rc; |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
8e09f215 | 175 | void dasd_gendisk_exit(void) |
1da177e4 LT |
176 | { |
177 | unregister_blkdev(DASD_MAJOR, "dasd"); | |
178 | } |