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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 223089 2011-06-14 17:10:32Z gibbs $
   10  *
   11  */
   12 
   13 #ifndef _SYS_DISK_H_
   14 #define _SYS_DISK_H_
   15 
   16 #include <sys/ioccom.h>
   17 
   18 #ifdef _KERNEL
   19 
   20 #ifndef _SYS_CONF_H_
   21 #include <sys/conf.h>   /* XXX: temporary to avoid breakage */
   22 #endif
   23 
   24 void disk_err(struct bio *bp, const char *what, int blkdone, int nl);
   25 
   26 #endif
   27 
   28 #define DIOCGSECTORSIZE _IOR('d', 128, u_int)
   29         /*
   30          * Get the sector size of the device in bytes.  The sector size is the
   31          * smallest unit of data which can be transferred from this device.
   32          * Usually this is a power of 2 but it might not be (i.e. CDROM audio).
   33          */
   34 
   35 #define DIOCGMEDIASIZE  _IOR('d', 129, off_t)   /* Get media size in bytes */
   36         /*
   37          * Get the size of the entire device in bytes.  This should be a
   38          * multiple of the sector size.
   39          */
   40 
   41 #define DIOCGFWSECTORS  _IOR('d', 130, u_int)   /* Get firmware's sectorcount */
   42         /*
   43          * Get the firmware's notion of number of sectors per track.  This
   44          * value is mostly used for compatibility with various ill designed
   45          * disk label formats.  Don't use it unless you have to.
   46          */
   47 
   48 #define DIOCGFWHEADS    _IOR('d', 131, u_int)   /* Get firmware's headcount */
   49         /*
   50          * Get the firmwares notion of number of heads per cylinder.  This
   51          * value is mostly used for compatibility with various ill designed
   52          * disk label formats.  Don't use it unless you have to.
   53          */
   54 
   55 #define DIOCSKERNELDUMP _IOW('d', 133, u_int)   /* Set/Clear kernel dumps */
   56         /*
   57          * Enable/Disable (the argument is boolean) the device for kernel
   58          * core dumps.
   59          */
   60         
   61 #define DIOCGFRONTSTUFF _IOR('d', 134, off_t)
   62         /*
   63          * Many disk formats have some amount of space reserved at the
   64          * start of the disk to hold bootblocks, various disklabels and
   65          * similar stuff.  This ioctl returns the number of such bytes
   66          * which may apply to the device.
   67          */
   68 
   69 #define DIOCGFLUSH _IO('d', 135)                /* Flush write cache */
   70         /*
   71          * Flush write cache of the device.
   72          */
   73 
   74 #define DIOCGDELETE _IOW('d', 136, off_t[2])    /* Delete data */
   75         /*
   76          * Mark data on the device as unused.
   77          */
   78 
   79 #define DISK_IDENT_SIZE 256
   80 #define DIOCGIDENT _IOR('d', 137, char[DISK_IDENT_SIZE])
   81         /*-
   82          * Get the ident of the given provider. Ident is (most of the time)
   83          * a uniqe and fixed provider's identifier. Ident's properties are as
   84          * follow:
   85          * - ident value is preserved between reboots,
   86          * - provider can be detached/attached and ident is preserved,
   87          * - provider's name can change - ident can't,
   88          * - ident value should not be based on on-disk metadata; in other
   89          *   words copying whole data from one disk to another should not
   90          *   yield the same ident for the other disk,
   91          * - there could be more than one provider with the same ident, but
   92          *   only if they point at exactly the same physical storage, this is
   93          *   the case for multipathing for example,
   94          * - GEOM classes that consumes single providers and provide single
   95          *   providers, like geli, gbde, should just attach class name to the
   96          *   ident of the underlying provider,
   97          * - ident is an ASCII string (is printable),
   98          * - ident is optional and applications can't relay on its presence.
   99          */
  100 
  101 #define DIOCGPROVIDERNAME _IOR('d', 138, char[MAXPATHLEN])
  102         /*
  103          * Store the provider name, given a device path, in a buffer. The buffer
  104          * must be at least MAXPATHLEN bytes long.
  105          */
  106 
  107 #define DIOCGSTRIPESIZE _IOR('d', 139, off_t)   /* Get stripe size in bytes */
  108         /*
  109          * Get the size of the device's optimal access block in bytes.
  110          * This should be a multiple of the sector size.
  111          */
  112 
  113 #define DIOCGSTRIPEOFFSET _IOR('d', 140, off_t) /* Get stripe offset in bytes */
  114         /*
  115          * Get the offset of the first device's optimal access block in bytes.
  116          * This should be a multiple of the sector size.
  117          */
  118 
  119 #define DIOCGPHYSPATH _IOR('d', 141, char[MAXPATHLEN])
  120         /*
  121          * Get a string defining the physical path for a given provider.
  122          * This has similar rules to ident, but is intended to uniquely
  123          * identify the physical location of the device, not the current
  124          * occupant of that location.
  125          */
  126 
  127 #endif /* _SYS_DISK_H_ */

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