FreeBSD/Linux Kernel Cross Reference
sys/sys/disk.h

     /*
      * Copyright (c) 2003,2004 The DragonFly Project.  All rights reserved.
      * 
      * This code is derived from software contributed to The DragonFly Project
      * by Matthew Dillon <dillon@backplane.com>
      * 
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in
     *    the documentation and/or other materials provided with the
     *    distribution.
     * 3. Neither the name of The DragonFly Project nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific, prior written permission.
     * 
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
     * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     * 
     * ----------------------------------------------------------------------------
     * "THE BEER-WARE LICENSE" (Revision 42):
     * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
     * can do whatever you want with this stuff. If we meet some day, and you think
     * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
     * ----------------------------------------------------------------------------
     *
     * $FreeBSD: src/sys/sys/disk.h,v 1.16.2.3 2001/06/20 16:11:01 scottl Exp $
     * $DragonFly: src/sys/sys/disk.h,v 1.18 2007/07/30 08:02:40 dillon Exp $
     */
    
    #ifndef _SYS_DISK_H_
    #define _SYS_DISK_H_
    
    #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
    #error "This file should not be included by userland programs."
    #endif
    
    #ifndef _SYS_DISKSLICE_H_
    #include <sys/diskslice.h>
    #endif
    #ifndef _SYS_QUEUE_H_
    #include <sys/queue.h>
    #endif
    #ifndef _SYS_MSGPORT_H_
    #include <sys/msgport.h>
    #endif
    #ifndef _SYS_DMSG_H_
    #include <sys/dmsg.h>
    #endif
    
    /*
     * Media information structure - filled in by the media driver.
     *
     * NOTE: d_serialno is copied on the call to setdiskinfo and need
     *       not be valid after that.
     */
    struct disk_info {
            /*
             * These fields are required.  Most drivers will load a disk_info
             * structure in the device open function with the media parameters
             * and call disk_setdiskinfo().
             *
             * Note that only one of d_media_size or d_media_blocks should be
             * filled in.
             *
             * d_media_size         media size in bytes
             * d_media_blocks       media size in blocks (e.g. total sectors)
             * d_media_blksize      media block size / sector size
             * d_dsflags            disklabel management flags
             */
            u_int64_t               d_media_size;
            u_int64_t               d_media_blocks;
            int                     d_media_blksize;
            u_int                   d_dsflags;
    
            /*
             * Optional fields, leave 0 if not known
             */
            u_int                   d_type;         /* DTYPE_xxx */
            u_int                   d_nheads;
            u_int                   d_ncylinders;
            u_int                   d_secpertrack;
            u_int                   d_secpercyl;
            u_int                   d_trimflag;
            char                    *d_serialno;
   };
   
   /*
    * d_dsflags, also used for dsopen() - control disklabel processing
    *
    * COMPATPARTA  - used by scsi devices to allow CDs to boot from cd0a.
    *                cd's don't have disklabels and the default compat label
    *                does not implement an 'a' partition.
    *
    * COMPATMBR    - used by the vn device to request that one sector be
    *                reserved as if an MBR were present even when one isn't.
    *
    * MBRQUIET     - silently ignore MBR probe if unable to read sector 0.
    *                used by VN.
    *
    * DEVICEMAPPER - used by the device mapper (dm). Adds a '.' between the
    *                device name and the slice/part stuff (i.e. foo.s0).
    *
    * RAWPSIZE     - use the dev_psize of the underlying raw device if the top
    *                psize fails.
    */
   #define DSO_NOLABELS            0x0001
   #define DSO_ONESLICE            0x0002
   #define DSO_COMPATLABEL         0x0004
   #define DSO_COMPATPARTA         0x0008
   #define DSO_COMPATMBR           0x0010
   #define DSO_RAWEXTENSIONS       0x0020
   #define DSO_MBRQUIET            0x0040
   #define DSO_DEVICEMAPPER        0x0080
   #define DSO_RAWPSIZE            0x0100
   
   #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   
   /*
    * Disk management structure - automated disklabel support.
    */
   struct disk {
           struct dev_ops          *d_dev_ops;     /* our device switch */
           struct dev_ops          *d_raw_ops;     /* the raw device switch */
           u_int                   d_flags;
           int                     d_opencount;    /* The current open count */
           cdev_t                  d_rawdev;       /* backing raw device */
           cdev_t                  d_cdev;         /* special whole-disk part */
           struct diskslices       *d_slice;
           struct disk_info        d_info;         /* info structure for media */
           void                    *d_dsched_priv1;/* I/O scheduler priv. data */
           void                    *d_dsched_priv2;/* I/O scheduler priv. data */
           struct dsched_policy    *d_sched_policy;/* I/O scheduler policy */
           const char              *d_disktype;    /* Disk type information */
           LIST_ENTRY(disk)        d_list;
           kdmsg_iocom_t           d_iocom;        /* cluster import/export */
           int                     d_refs;         /* interlock destruction */
   };
   
   #endif
   
   /*
    * d_flags
    */
   #define DISKFLAG_LOCK           0x0001
   #define DISKFLAG_WANTED         0x0002
   #define DISKFLAG_MARKER         0x0004
   
   #ifdef _KERNEL
   cdev_t disk_create (int unit, struct disk *disk, struct dev_ops *raw_ops);
   cdev_t disk_create_clone (int unit, struct disk *disk, struct dev_ops *raw_ops);
   cdev_t disk_create_named(const char *name, int unit, struct disk *dp, struct dev_ops *raw_ops);
   cdev_t disk_create_named_clone(const char *name, int unit, struct disk *dp, struct dev_ops *raw_ops);
   cdev_t disk_locate (const char *devname);
   void disk_destroy (struct disk *disk);
   void disk_setdiskinfo (struct disk *disk, struct disk_info *info);
   int disk_setdisktype(struct disk *disk, const char *type);
   int disk_getopencount(struct disk *disk);
   void disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info);
   int disk_dumpcheck (cdev_t dev, u_int64_t *count, u_int64_t *blkno, u_int *secsize);
   int disk_dumpconf(cdev_t dev, u_int onoff);
   struct disk *disk_enumerate (struct disk *marker, struct disk *dp);
   void disk_enumerate_stop (struct disk *marker, struct disk *dp);
   void disk_invalidate (struct disk *disk);
   void disk_unprobe(struct disk *disk);
   
   void disk_msg_send(uint32_t cmd, void *load, void *load2);
   void disk_msg_send_sync(uint32_t cmd, void *load, void *load2);
   void disk_config(void *);
   
   int bounds_check_with_mediasize(struct bio *bio, int secsize, uint64_t mediasize);
   
   void disk_iocom_init(struct disk *dp);
   void disk_iocom_update(struct disk *dp);
   void disk_iocom_uninit(struct disk *dp);
   int disk_iocom_ioctl(struct disk *dp, int cmd, void *data);
   void disk_clusterctl_wakeup(kdmsg_iocom_t *iocom);
   
   typedef struct disk_msg {
           struct lwkt_msg hdr;
           void    *load;
           void    *load2;
   } *disk_msg_t;
   
   #define DISK_DISK_PROBE         0x01
   #define DISK_DISK_DESTROY       0x02
   #define DISK_SLICE_REPROBE      0x03
   #define DISK_DISK_REPROBE       0x04
   #define DISK_UNPROBE            0x05
   #define DISK_SYNC               0x99
   
   
   #endif /* _KERNEL */
   
   #endif /* _SYS_DISK_H_ */

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