The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/disk.h

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    1 /*-
    2  * ----------------------------------------------------------------------------
    3  * "THE BEER-WARE LICENSE" (Revision 42):
    4  * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
    5  * can do whatever you want with this stuff. If we meet some day, and you think
    6  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
    7  * ----------------------------------------------------------------------------
    8  *
    9  * $FreeBSD: head/sys/sys/disk.h 274163 2014-11-06 04:13:28Z mav $
   10  *
   11  */
   12 
   13 #ifndef _SYS_DISK_H_
   14 #define _SYS_DISK_H_
   15 
   16 #include <sys/ioccom.h>
   17 #include <sys/types.h>
   18 
   19 #ifdef _KERNEL
   20 
   21 #ifndef _SYS_CONF_H_
   22 #include <sys/conf.h>   /* XXX: temporary to avoid breakage */
   23 #endif
   24 
   25 void disk_err(struct bio *bp, const char *what, int blkdone, int nl);
   26 
   27 #endif
   28 
   29 #define DIOCGSECTORSIZE _IOR('d', 128, u_int)
   30         /*
   31          * Get the sector size of the device in bytes.  The sector size is the
   32          * smallest unit of data which can be transferred from this device.
   33          * Usually this is a power of 2 but it might not be (i.e. CDROM audio).
   34          */
   35 
   36 #define DIOCGMEDIASIZE  _IOR('d', 129, off_t)   /* Get media size in bytes */
   37         /*
   38          * Get the size of the entire device in bytes.  This should be a
   39          * multiple of the sector size.
   40          */
   41 
   42 #define DIOCGFWSECTORS  _IOR('d', 130, u_int)   /* Get firmware's sectorcount */
   43         /*
   44          * Get the firmware's notion of number of sectors per track.  This
   45          * value is mostly used for compatibility with various ill designed
   46          * disk label formats.  Don't use it unless you have to.
   47          */
   48 
   49 #define DIOCGFWHEADS    _IOR('d', 131, u_int)   /* Get firmware's headcount */
   50         /*
   51          * Get the firmwares notion of number of heads per cylinder.  This
   52          * value is mostly used for compatibility with various ill designed
   53          * disk label formats.  Don't use it unless you have to.
   54          */
   55 
   56 #define DIOCSKERNELDUMP _IOW('d', 133, u_int)   /* Set/Clear kernel dumps */
   57         /*
   58          * Enable/Disable (the argument is boolean) the device for kernel
   59          * core dumps.
   60          */
   61         
   62 #define DIOCGFRONTSTUFF _IOR('d', 134, off_t)
   63         /*
   64          * Many disk formats have some amount of space reserved at the
   65          * start of the disk to hold bootblocks, various disklabels and
   66          * similar stuff.  This ioctl returns the number of such bytes
   67          * which may apply to the device.
   68          */
   69 
   70 #define DIOCGFLUSH _IO('d', 135)                /* Flush write cache */
   71         /*
   72          * Flush write cache of the device.
   73          */
   74 
   75 #define DIOCGDELETE _IOW('d', 136, off_t[2])    /* Delete data */
   76         /*
   77          * Mark data on the device as unused.
   78          */
   79 
   80 #define DISK_IDENT_SIZE 256
   81 #define DIOCGIDENT _IOR('d', 137, char[DISK_IDENT_SIZE])
   82         /*-
   83          * Get the ident of the given provider. Ident is (most of the time)
   84          * a uniqe and fixed provider's identifier. Ident's properties are as
   85          * follow:
   86          * - ident value is preserved between reboots,
   87          * - provider can be detached/attached and ident is preserved,
   88          * - provider's name can change - ident can't,
   89          * - ident value should not be based on on-disk metadata; in other
   90          *   words copying whole data from one disk to another should not
   91          *   yield the same ident for the other disk,
   92          * - there could be more than one provider with the same ident, but
   93          *   only if they point at exactly the same physical storage, this is
   94          *   the case for multipathing for example,
   95          * - GEOM classes that consumes single providers and provide single
   96          *   providers, like geli, gbde, should just attach class name to the
   97          *   ident of the underlying provider,
   98          * - ident is an ASCII string (is printable),
   99          * - ident is optional and applications can't relay on its presence.
  100          */
  101 
  102 #define DIOCGPROVIDERNAME _IOR('d', 138, char[MAXPATHLEN])
  103         /*
  104          * Store the provider name, given a device path, in a buffer. The buffer
  105          * must be at least MAXPATHLEN bytes long.
  106          */
  107 
  108 #define DIOCGSTRIPESIZE _IOR('d', 139, off_t)   /* Get stripe size in bytes */
  109         /*
  110          * Get the size of the device's optimal access block in bytes.
  111          * This should be a multiple of the sector size.
  112          */
  113 
  114 #define DIOCGSTRIPEOFFSET _IOR('d', 140, off_t) /* Get stripe offset in bytes */
  115         /*
  116          * Get the offset of the first device's optimal access block in bytes.
  117          * This should be a multiple of the sector size.
  118          */
  119 
  120 #define DIOCGPHYSPATH _IOR('d', 141, char[MAXPATHLEN])
  121         /*
  122          * Get a string defining the physical path for a given provider.
  123          * This has similar rules to ident, but is intended to uniquely
  124          * identify the physical location of the device, not the current
  125          * occupant of that location.
  126          */
  127 
  128 struct diocgattr_arg {
  129         char name[64];
  130         int len;
  131         union {
  132                 char str[DISK_IDENT_SIZE];
  133                 off_t off;
  134         } value;
  135 };
  136 #define DIOCGATTR _IOWR('d', 142, struct diocgattr_arg)
  137 
  138 #endif /* _SYS_DISK_H_ */

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