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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd_genhd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
10 | * gendisk related functions for the dasd driver. | |
11 | * | |
12 | * $Revision: 1.48 $ | |
13 | */ | |
14 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/blkpg.h> | |
19 | ||
20 | #include <asm/uaccess.h> | |
21 | ||
22 | /* This is ugly... */ | |
23 | #define PRINTK_HEADER "dasd_gendisk:" | |
24 | ||
25 | #include "dasd_int.h" | |
26 | ||
27 | /* | |
28 | * Allocate and register gendisk structure for device. | |
29 | */ | |
30 | int | |
31 | dasd_gendisk_alloc(struct dasd_device *device) | |
32 | { | |
33 | struct gendisk *gdp; | |
34 | int len; | |
35 | ||
36 | /* Make sure the minor for this device exists. */ | |
37 | if (device->devindex >= DASD_PER_MAJOR) | |
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; | |
46 | gdp->first_minor = device->devindex << DASD_PARTN_BITS; | |
47 | gdp->fops = &dasd_device_operations; | |
48 | gdp->driverfs_dev = &device->cdev->dev; | |
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"); | |
58 | if (device->devindex > 25) { | |
59 | if (device->devindex > 701) { | |
60 | if (device->devindex > 18277) | |
61 | len += sprintf(gdp->disk_name + len, "%c", | |
62 | 'a'+(((device->devindex-18278) | |
63 | /17576)%26)); | |
64 | len += sprintf(gdp->disk_name + len, "%c", | |
65 | 'a'+(((device->devindex-702)/676)%26)); | |
66 | } | |
67 | len += sprintf(gdp->disk_name + len, "%c", | |
68 | 'a'+(((device->devindex-26)/26)%26)); | |
69 | } | |
70 | len += sprintf(gdp->disk_name + len, "%c", 'a'+(device->devindex%26)); | |
71 | ||
72 | sprintf(gdp->devfs_name, "dasd/%s", device->cdev->dev.bus_id); | |
73 | ||
74 | if (test_bit(DASD_FLAG_RO, &device->flags)) | |
75 | set_disk_ro(gdp, 1); | |
76 | gdp->private_data = device; | |
77 | gdp->queue = device->request_queue; | |
78 | device->gdp = gdp; | |
79 | set_capacity(device->gdp, 0); | |
80 | add_disk(device->gdp); | |
81 | return 0; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Unregister and free gendisk structure for device. | |
86 | */ | |
87 | void | |
88 | dasd_gendisk_free(struct dasd_device *device) | |
89 | { | |
90 | del_gendisk(device->gdp); | |
91 | device->gdp->queue = 0; | |
92 | put_disk(device->gdp); | |
93 | device->gdp = 0; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Trigger a partition detection. | |
98 | */ | |
99 | int | |
100 | dasd_scan_partitions(struct dasd_device * device) | |
101 | { | |
102 | struct block_device *bdev; | |
103 | ||
104 | /* Make the disk known. */ | |
105 | set_capacity(device->gdp, device->blocks << device->s2b_shift); | |
106 | bdev = bdget_disk(device->gdp, 0); | |
107 | if (!bdev || blkdev_get(bdev, FMODE_READ, 1) < 0) | |
108 | return -ENODEV; | |
109 | /* | |
110 | * See fs/partition/check.c:register_disk,rescan_partitions | |
111 | * Can't call rescan_partitions directly. Use ioctl. | |
112 | */ | |
113 | ioctl_by_bdev(bdev, BLKRRPART, 0); | |
114 | /* | |
115 | * Since the matching blkdev_put call to the blkdev_get in | |
116 | * this function is not called before dasd_destroy_partitions | |
117 | * the offline open_count limit needs to be increased from | |
118 | * 0 to 1. This is done by setting device->bdev (see | |
119 | * dasd_generic_set_offline). As long as the partition | |
120 | * detection is running no offline should be allowed. That | |
121 | * is why the assignment to device->bdev is done AFTER | |
122 | * the BLKRRPART ioctl. | |
123 | */ | |
124 | device->bdev = bdev; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Remove all inodes in the system for a device, delete the | |
130 | * partitions and make device unusable by setting its size to zero. | |
131 | */ | |
132 | void | |
133 | dasd_destroy_partitions(struct dasd_device * device) | |
134 | { | |
135 | /* The two structs have 168/176 byte on 31/64 bit. */ | |
136 | struct blkpg_partition bpart; | |
137 | struct blkpg_ioctl_arg barg; | |
138 | struct block_device *bdev; | |
139 | ||
140 | /* | |
141 | * Get the bdev pointer from the device structure and clear | |
142 | * device->bdev to lower the offline open_count limit again. | |
143 | */ | |
144 | bdev = device->bdev; | |
145 | device->bdev = 0; | |
146 | ||
147 | /* | |
148 | * See fs/partition/check.c:delete_partition | |
149 | * Can't call delete_partitions directly. Use ioctl. | |
150 | * The ioctl also does locking and invalidation. | |
151 | */ | |
152 | memset(&bpart, 0, sizeof(struct blkpg_partition)); | |
153 | memset(&barg, 0, sizeof(struct blkpg_ioctl_arg)); | |
154 | barg.data = &bpart; | |
155 | barg.op = BLKPG_DEL_PARTITION; | |
156 | for (bpart.pno = device->gdp->minors - 1; bpart.pno > 0; bpart.pno--) | |
157 | ioctl_by_bdev(bdev, BLKPG, (unsigned long) &barg); | |
158 | ||
159 | invalidate_partition(device->gdp, 0); | |
160 | /* Matching blkdev_put to the blkdev_get in dasd_scan_partitions. */ | |
161 | blkdev_put(bdev); | |
162 | set_capacity(device->gdp, 0); | |
163 | } | |
164 | ||
165 | int | |
166 | dasd_gendisk_init(void) | |
167 | { | |
168 | int rc; | |
169 | ||
170 | /* Register to static dasd major 94 */ | |
171 | rc = register_blkdev(DASD_MAJOR, "dasd"); | |
172 | if (rc != 0) { | |
173 | MESSAGE(KERN_WARNING, | |
174 | "Couldn't register successfully to " | |
175 | "major no %d", DASD_MAJOR); | |
176 | return rc; | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | void | |
182 | dasd_gendisk_exit(void) | |
183 | { | |
184 | unregister_blkdev(DASD_MAJOR, "dasd"); | |
185 | } |