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

     /*-
      * SPDX-License-Identifier: Beerware
      *
      * ----------------------------------------------------------------------------
      * "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
      * ----------------------------------------------------------------------------
     *
     * $FreeBSD$
     *
     */
    
    #ifndef _SYS_DISK_H_
    #define _SYS_DISK_H_
    
    #include <sys/ioccom.h>
    #include <sys/kerneldump.h>
    #include <sys/types.h>
    #include <sys/disk_zone.h>
    
    #ifdef _KERNEL
    
    #ifndef _SYS_CONF_H_
    #include <sys/conf.h>   /* XXX: temporary to avoid breakage */
    #endif
    
    void disk_err(struct bio *bp, const char *what, int blkdone, int nl);
    
    #endif
    
    #define DIOCGSECTORSIZE _IOR('d', 128, u_int)
            /*
             * Get the sector size of the device in bytes.  The sector size is the
             * smallest unit of data which can be transferred from this device.
             * Usually this is a power of 2 but it might not be (i.e. CDROM audio).
             */
    
    #define DIOCGMEDIASIZE  _IOR('d', 129, off_t)   /* Get media size in bytes */
            /*
             * Get the size of the entire device in bytes.  This should be a
             * multiple of the sector size.
             */
    
    #define DIOCGFWSECTORS  _IOR('d', 130, u_int)   /* Get firmware's sectorcount */
            /*
             * Get the firmware's notion of number of sectors per track.  This
             * value is mostly used for compatibility with various ill designed
             * disk label formats.  Don't use it unless you have to.
             */
    
    #define DIOCGFWHEADS    _IOR('d', 131, u_int)   /* Get firmware's headcount */
            /*
             * Get the firmwares notion of number of heads per cylinder.  This
             * value is mostly used for compatibility with various ill designed
             * disk label formats.  Don't use it unless you have to.
             */
    
    #define DIOCSKERNELDUMP_FREEBSD11 _IOW('d', 133, u_int)
            /*
             * Enable/Disable (the argument is boolean) the device for kernel
             * core dumps.
             */
            
    #define DIOCGFRONTSTUFF _IOR('d', 134, off_t)
            /*
             * Many disk formats have some amount of space reserved at the
             * start of the disk to hold bootblocks, various disklabels and
             * similar stuff.  This ioctl returns the number of such bytes
             * which may apply to the device.
             */
    
    #define DIOCGFLUSH _IO('d', 135)                /* Flush write cache */
            /*
             * Flush write cache of the device.
             */
    
    #define DIOCGDELETE _IOW('d', 136, off_t[2])    /* Delete data */
            /*
             * Mark data on the device as unused.
             */
    
    #define DISK_IDENT_SIZE 256
    #define DIOCGIDENT _IOR('d', 137, char[DISK_IDENT_SIZE])
            /*-
             * Get the ident of the given provider. Ident is (most of the time)
             * a uniqe and fixed provider's identifier. Ident's properties are as
             * follow:
             * - ident value is preserved between reboots,
             * - provider can be detached/attached and ident is preserved,
             * - provider's name can change - ident can't,
             * - ident value should not be based on on-disk metadata; in other
             *   words copying whole data from one disk to another should not
             *   yield the same ident for the other disk,
             * - there could be more than one provider with the same ident, but
             *   only if they point at exactly the same physical storage, this is
             *   the case for multipathing for example,
             * - GEOM classes that consumes single providers and provide single
            *   providers, like geli, gbde, should just attach class name to the
            *   ident of the underlying provider,
            * - ident is an ASCII string (is printable),
            * - ident is optional and applications can't relay on its presence.
            */
   
   #define DIOCGPROVIDERNAME _IOR('d', 138, char[MAXPATHLEN])
           /*
            * Store the provider name, given a device path, in a buffer. The buffer
            * must be at least MAXPATHLEN bytes long.
            */
   
   #define DIOCGSTRIPESIZE _IOR('d', 139, off_t)   /* Get stripe size in bytes */
           /*
            * Get the size of the device's optimal access block in bytes.
            * This should be a multiple of the sector size.
            */
   
   #define DIOCGSTRIPEOFFSET _IOR('d', 140, off_t) /* Get stripe offset in bytes */
           /*
            * Get the offset of the first device's optimal access block in bytes.
            * This should be a multiple of the sector size.
            */
   
   #define DIOCGPHYSPATH _IOR('d', 141, char[MAXPATHLEN])
           /*
            * Get a string defining the physical path for a given provider.
            * This has similar rules to ident, but is intended to uniquely
            * identify the physical location of the device, not the current
            * occupant of that location.
            */
   
   struct diocgattr_arg {
           char name[64];
           int len;
           union {
                   char str[DISK_IDENT_SIZE];
                   off_t off;
                   int i;
                   uint16_t u16;
           } value;
   };
   #define DIOCGATTR _IOWR('d', 142, struct diocgattr_arg)
   
   #define DIOCZONECMD     _IOWR('d', 143, struct disk_zone_args)
   
   struct diocskerneldump_arg {
           uint8_t          kda_enable;
           uint8_t          kda_compression;
           uint8_t          kda_encryption;
           uint8_t          kda_key[KERNELDUMP_KEY_MAX_SIZE];
           uint32_t         kda_encryptedkeysize;
           uint8_t         *kda_encryptedkey;
   };
   #define DIOCSKERNELDUMP _IOW('d', 144, struct diocskerneldump_arg)
           /*
            * Enable/Disable the device for kernel core dumps.
            */
   
   #endif /* _SYS_DISK_H_ */

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