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7812d86f03
and predictable way, and I apologize if I have gotten it wrong anywhere, getting prior review on a patch like this is not feasible, considering the number of people involved and hardware availability etc.) If struct disklabel is the messenger: kill the messenger. Inside struct disk we had a struct disklabel which disk drivers used to communicate certain metrics to the disklayer above (GEOM or the disk mini-layer). This commit changes this communication to use four explicit fields instead. Amongst the benefits is that the fields do not get overwritten by wrong or bogus on-disk disklabels. Once that is clear, <sys/disk.h> which is included in the drivers no longer need to pull <sys/disklabel.h> and <sys/diskslice.h> in, the few places that needs them, have gotten explicit #includes for them. The disklabel inside struct disk is now only for internal use in the disk mini-layer, so instead of embedding it, we malloc it as we need it. This concludes (modulus any mistakes) the series of disklabel related commits. I belive it all amounts to a NOP for all the rest of you :-) Sponsored by: DARPA & NAI Labs.
92 lines
2.7 KiB
C
92 lines
2.7 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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#include <sys/queue.h>
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struct disk {
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u_int d_flags;
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u_int d_dsflags;
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struct cdevsw *d_devsw;
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dev_t d_dev;
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/* These four fields must be valid while opened */
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u_int d_sectorsize;
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off_t d_mediasize;
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u_int d_fwsectors;
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u_int d_fwheads;
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struct diskslices *d_slice;
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struct disklabel *d_label;
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LIST_ENTRY(disk) d_list;
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void *d_softc;
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};
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#define DISKFLAG_LOCK 0x1
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#define DISKFLAG_WANTED 0x2
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dev_t disk_create(int unit, struct disk *disk, int flags, struct cdevsw *cdevsw, struct cdevsw *diskdevsw);
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void disk_destroy(dev_t dev);
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struct disk *disk_enumerate(struct disk *disk);
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void disk_err(struct bio *bp, const char *what, int blkdone, int nl);
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void disk_invalidate(struct disk *disk);
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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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#endif /* _SYS_DISK_H_ */
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