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Annotation of Gnu-Mach/linux/dev/drivers/scsi/sd_ioctl.c, revision 1.1

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: #ifndef MACH
        !            35:        error = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
        !            36:        if (error)
        !            37:            return error;
        !            38: #endif
        !            39:        host = rscsi_disks[MINOR(dev) >> 4].device->host;
        !            40: 
        !            41: /* default to most commonly used values */
        !            42: 
        !            43:         diskinfo[0] = 0x40;
        !            44:         diskinfo[1] = 0x20;
        !            45:         diskinfo[2] = rscsi_disks[MINOR(dev) >> 4].capacity >> 11;
        !            46: 
        !            47: /* override with calculated, extended default, or driver values */
        !            48: 
        !            49:        if(host->hostt->bios_param != NULL)
        !            50:            host->hostt->bios_param(&rscsi_disks[MINOR(dev) >> 4],
        !            51:                                    dev,
        !            52:                                    &diskinfo[0]);
        !            53:         else scsicam_bios_param(&rscsi_disks[MINOR(dev) >> 4],
        !            54:                                dev, &diskinfo[0]);
        !            55: 
        !            56: #ifdef MACH
        !            57:         loc->heads = diskinfo[0];
        !            58:         loc->sectors = diskinfo[1];
        !            59:         loc->cylinders = diskinfo[2];
        !            60:         loc->start = sd[MINOR(inode->i_rdev)].start_sect;
        !            61: #else
        !            62:        put_user(diskinfo[0], &loc->heads);
        !            63:        put_user(diskinfo[1], &loc->sectors);
        !            64:        put_user(diskinfo[2], &loc->cylinders);
        !            65:        put_user(sd[MINOR(inode->i_rdev)].start_sect, &loc->start);
        !            66: #endif
        !            67:        return 0;
        !            68:     case BLKGETSIZE:   /* Return device size */
        !            69:        if (!arg)  return -EINVAL;
        !            70:        error = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
        !            71:        if (error)
        !            72:            return error;
        !            73:        put_user(sd[MINOR(inode->i_rdev)].nr_sects,
        !            74:                 (long *) arg);
        !            75:        return 0;
        !            76: 
        !            77:     case BLKRASET:
        !            78:        if (!suser())
        !            79:                return -EACCES;
        !            80:        if(!(inode->i_rdev)) return -EINVAL;
        !            81:        if(arg > 0xff) return -EINVAL;
        !            82:        read_ahead[MAJOR(inode->i_rdev)] = arg;
        !            83:        return 0;
        !            84: 
        !            85:     case BLKRAGET:
        !            86:        if (!arg)
        !            87:                return -EINVAL;
        !            88:        error = verify_area(VERIFY_WRITE, (int *) arg, sizeof(int));
        !            89:        if (error)
        !            90:            return error;
        !            91:        put_user(read_ahead[MAJOR(inode->i_rdev)], (int *) arg);
        !            92:        return 0;
        !            93: 
        !            94:     case BLKFLSBUF:
        !            95:        if(!suser())  return -EACCES;
        !            96:        if(!(inode->i_rdev)) return -EINVAL;
        !            97:        fsync_dev(inode->i_rdev);
        !            98:        invalidate_buffers(inode->i_rdev);
        !            99:        return 0;
        !           100:        
        !           101:     case BLKRRPART: /* Re-read partition tables */
        !           102:        return revalidate_scsidisk(dev, 1);
        !           103: 
        !           104:     RO_IOCTLS(dev, arg);
        !           105: 
        !           106:     default:
        !           107:        return scsi_ioctl(rscsi_disks[MINOR(dev) >> 4].device , cmd, (void *) arg);
        !           108:     }
        !           109: }
        !           110: 
        !           111: /*
        !           112:  * Overrides for Emacs so that we follow Linus's tabbing style.
        !           113:  * Emacs will notice this stuff at the end of the file and automatically
        !           114:  * adjust the settings for this buffer only.  This must remain at the end
        !           115:  * of the file.
        !           116:  * ---------------------------------------------------------------------------
        !           117:  * Local variables:
        !           118:  * c-indent-level: 4
        !           119:  * c-brace-imaginary-offset: 0
        !           120:  * c-brace-offset: -4
        !           121:  * c-argdecl-indent: 4
        !           122:  * c-label-offset: -4
        !           123:  * c-continued-statement-offset: 4
        !           124:  * c-continued-brace-offset: 0
        !           125:  * indent-tabs-mode: nil
        !           126:  * tab-width: 8
        !           127:  * End:
        !           128:  */

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