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30 * Device descriptor for partitioned disks. To use, set the
31 * d_slice and d_partition variables as follows:
40 * d_slice = MBR slice number (typically 1..4)
43 * BSD disklabel partition within an MBR slice:
45 * d_slice = MBR slice number (typically 1..4)
46 * d_partition = disklabel partition (typically 0..19)
48 * BSD disklabel partition on the true dedicated disk:
51 * d_partition = disklabel partition (typically 0..19)
55 * d_slice = GPT partition number (typically 1..N)
58 * For both MBR and GPT, to automatically find the 'best' slice or partition,
59 * set d_slice to zero. This uses the partition type to decide which partition
60 * to use according to the following list of preferences:
66 * DOS/Windows (active)
67 * DOS/Windows (inactive)
69 * Active MBR slices (marked as bootable) are preferred over inactive. GPT
70 * doesn't have the concept of active/inactive partitions. In both MBR and GPT,
71 * if there are multiple slices/partitions of a given type, the first one
74 * The low-level disk device will typically call disk_open() from its open
75 * method to interpret the disk partition tables according to the rules above.
76 * This will initialize d_offset to the block offset of the start of the
77 * selected partition - this offset should be added to the offset passed to
78 * the device's strategy method.
98 * Parse disk metadata and initialise dev->d_offset.
100 extern int disk_open(struct disk_devdesc *dev, uint64_t mediasize,
101 u_int sectorsize, u_int flags);
102 #define DISK_F_NOCACHE 0x0001 /* Do not use metadata caching */
103 extern int disk_close(struct disk_devdesc *dev);
104 extern void disk_cleanup(const struct devsw *d_dev);
105 extern int disk_ioctl(struct disk_devdesc *dev, u_long cmd, void *buf);
106 extern int disk_read(struct disk_devdesc *dev, void *buf, uint64_t offset,
108 extern int disk_write(struct disk_devdesc *dev, void *buf, uint64_t offset,
110 extern int ptblread(void *d, void *buf, size_t blocks, uint64_t offset);
113 * Print information about slices on a disk.
115 extern int disk_print(struct disk_devdesc *dev, char *prefix, int verbose);
116 extern char* disk_fmtdev(struct disk_devdesc *dev);
117 extern int disk_parsedev(struct disk_devdesc *dev, const char *devspec,