59c532c500
1. Extend geom_dev by having it create the symlink (i.e. call
make_dev_alias) based on the DIOCGPROVIDERALIAS ioctl.
In this way the functionaility is generic and thus usable
by any geom/provider.
2. Have g_part handle said ioctl through the devalias method,
so that it's under control of the scheme itself. By design
the alias will not be created for newly added partitions.
114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/*-
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*
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*/
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#ifndef _SYS_DISK_H_
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#define _SYS_DISK_H_
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#include <sys/ioccom.h>
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#ifdef _KERNEL
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#ifndef _SYS_CONF_H_
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#include <sys/conf.h> /* XXX: temporary to avoid breakage */
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#endif
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void disk_err(struct bio *bp, const char *what, int blkdone, int nl);
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#endif
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#define DIOCGSECTORSIZE _IOR('d', 128, u_int)
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/*-
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* Get the sectorsize of the device in bytes. The sectorsize is the
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* smallest unit of data which can be transfered from this device.
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* Usually this is a power of two but it may not be. (ie: CDROM audio)
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*/
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#define DIOCGMEDIASIZE _IOR('d', 129, off_t) /* Get media size in bytes */
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/*-
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* Get the size of the entire device in bytes. This should be a
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* multiple of the sectorsize.
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*/
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#define DIOCGFWSECTORS _IOR('d', 130, u_int) /* Get firmware sectorcount */
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/*-
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* Get the firmwares notion of number of sectors per track. This
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* value is mostly used for compatibility with various ill designed
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* disk label formats. Don't use it unless you have to.
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*/
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#define DIOCGFWHEADS _IOR('d', 131, u_int) /* Get firmware headcount */
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/*-
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* Get the firmwares notion of number of heads per cylinder. This
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* value is mostly used for compatibility with various ill designed
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* disk label formats. Don't use it unless you have to.
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*/
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#define DIOCSKERNELDUMP _IOW('d', 133, u_int) /* Set/Clear kernel dumps */
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/*-
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* Enable/Disable (the argument is boolean) the device for kernel
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* core dumps.
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*/
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#define DIOCGFRONTSTUFF _IOR('d', 134, off_t)
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/*-
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* Many disk formats have some amount of space reserved at the
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* start of the disk to hold bootblocks, various disklabels and
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* similar stuff. This ioctl returns the number of such bytes
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* which may apply to the device.
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*/
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#define DIOCGFLUSH _IO('d', 135) /* Flush write cache */
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/*-
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* Flush write cache of the device.
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*/
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#define DIOCGDELETE _IOW('d', 136, off_t[2]) /* Delete data */
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/*-
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* Mark data on the device as unused.
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*/
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#define DISK_IDENT_SIZE 256
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#define DIOCGIDENT _IOR('d', 137, char[DISK_IDENT_SIZE])
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/*-
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* Get the ident of the given provider. Ident is (most of the time)
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* a uniqe and fixed provider's identifier. Ident's properties are as
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* follow:
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* - ident value is preserved between reboots,
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* - provider can be detached/attached and ident is preserved,
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* - provider's name can change - ident can't,
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* - ident value should not be based on on-disk metadata; in other
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* words copying whole data from one disk to another should not
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* yield the same ident for the other disk,
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* - there could be more than one provider with the same ident, but
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* only if they point at exactly the same physical storage, this is
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* the case for multipathing for example,
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* - GEOM classes that consumes single providers and provide single
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* providers, like geli, gbde, should just attach class name to the
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* ident of the underlying provider,
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* - ident is an ASCII string (is printable),
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* - ident is optional and applications can't relay on its presence.
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*/
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#define DIOCGPROVIDERNAME _IOR('d', 138, char[MAXPATHLEN])
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/*-
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* Store the provider name, given a device path, in a buffer. The buffer
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* must be at least MAXPATHLEN bytes long.
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*/
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#define DIOCGPROVIDERALIAS _IOR('d', 139, char[MAXPATHLEN])
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/*-
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* Store the provider alias, if present, in a buffer. The buffer must
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* be at least MAXPATHLEN bytes long.
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*/
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#endif /* _SYS_DISK_H_ */
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