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1.1 root 1: /*
2: * drivers/scsi/sd_ioctl.c
3: *
4: * ioctl handling for SCSI disks
5: */
6:
7: #include <linux/kernel.h>
8: #include <linux/sched.h>
9: #include <linux/mm.h>
10: #include <linux/fs.h>
11: #include <linux/hdreg.h>
12: #include <linux/errno.h>
13:
14: #include <asm/segment.h>
15:
16: #include <linux/blk.h>
17: #include "scsi.h"
18: #include <scsi/scsi_ioctl.h>
19: #include "hosts.h"
20: #include "sd.h"
21: #include <scsi/scsicam.h> /* must follow "hosts.h" */
22:
23: int sd_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg)
24: {
25: kdev_t dev = inode->i_rdev;
26: int error;
27: struct Scsi_Host * host;
28: int diskinfo[4];
29: struct hd_geometry *loc = (struct hd_geometry *) arg;
30:
31: switch (cmd) {
32: case HDIO_GETGEO: /* Return BIOS disk parameters */
33: if (!loc) return -EINVAL;
34: error = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
35: if (error)
36: return error;
37: host = rscsi_disks[MINOR(dev) >> 4].device->host;
38:
39: /* default to most commonly used values */
40:
41: diskinfo[0] = 0x40;
42: diskinfo[1] = 0x20;
43: diskinfo[2] = rscsi_disks[MINOR(dev) >> 4].capacity >> 11;
44:
45: /* override with calculated, extended default, or driver values */
46:
47: if(host->hostt->bios_param != NULL)
48: host->hostt->bios_param(&rscsi_disks[MINOR(dev) >> 4],
49: dev,
50: &diskinfo[0]);
51: else scsicam_bios_param(&rscsi_disks[MINOR(dev) >> 4],
52: dev, &diskinfo[0]);
53:
54: put_user(diskinfo[0], &loc->heads);
55: put_user(diskinfo[1], &loc->sectors);
56: put_user(diskinfo[2], &loc->cylinders);
57: put_user(sd[MINOR(inode->i_rdev)].start_sect, &loc->start);
58: return 0;
59: case BLKGETSIZE: /* Return device size */
60: if (!arg) return -EINVAL;
61: error = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
62: if (error)
63: return error;
64: put_user(sd[MINOR(inode->i_rdev)].nr_sects,
65: (long *) arg);
66: return 0;
67:
68: case BLKRASET:
69: if (!suser())
70: return -EACCES;
71: if(!(inode->i_rdev)) return -EINVAL;
72: if(arg > 0xff) return -EINVAL;
73: read_ahead[MAJOR(inode->i_rdev)] = arg;
74: return 0;
75:
76: case BLKRAGET:
77: if (!arg)
78: return -EINVAL;
79: error = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
80: if (error)
81: return error;
82: put_user(read_ahead[MAJOR(inode->i_rdev)], (int *) arg);
83: return 0;
84:
85: case BLKFLSBUF:
86: if(!suser()) return -EACCES;
87: if(!(inode->i_rdev)) return -EINVAL;
88: fsync_dev(inode->i_rdev);
89: invalidate_buffers(inode->i_rdev);
90: return 0;
91:
92: case BLKRRPART: /* Re-read partition tables */
93: return revalidate_scsidisk(dev, 1);
94:
95: RO_IOCTLS(dev, arg);
96:
97: default:
98: return scsi_ioctl(rscsi_disks[MINOR(dev) >> 4].device , cmd, (void *) arg);
99: }
100: }
101:
102: /*
103: * Overrides for Emacs so that we follow Linus's tabbing style.
104: * Emacs will notice this stuff at the end of the file and automatically
105: * adjust the settings for this buffer only. This must remain at the end
106: * of the file.
107: * ---------------------------------------------------------------------------
108: * Local variables:
109: * c-indent-level: 4
110: * c-brace-imaginary-offset: 0
111: * c-brace-offset: -4
112: * c-argdecl-indent: 4
113: * c-label-offset: -4
114: * c-continued-statement-offset: 4
115: * c-continued-brace-offset: 0
116: * indent-tabs-mode: nil
117: * tab-width: 8
118: * End:
119: */
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