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30 * Device descriptor for partitioned disks. We assume that all disk addresses
31 * are 512 byte block offsets from the start of the disk. To use, set the
32 * d_slice and d_partition variables as follows:
41 * d_slice = MBR slice number (typically 1..4)
44 * BSD disklabel partition within an MBR slice:
46 * d_slice = MBR slice number (typically 1..4)
47 * d_partition = disklabel partition (typically 0..7)
51 * d_slice = GPT partition number (typically 1..N)
54 * For both MBR and GPT, to automatically find the 'best' slice or partition,
55 * set d_slice to zero. This uses the partition type to decide which partition
56 * to use according to the following list of preferences:
62 * DOS/Windows (active)
63 * DOS/Windows (inactive)
65 * Active MBR slices (marked as bootable) are preferred over inactive. GPT
66 * doesn't have the concept of active/inactive partitions. In both MBR and GPT,
67 * if there are multiple slices/partitions of a given type, the first one
70 * The low-level disk device will typically call slice_open() from its open
71 * method to interpret the disk partition tables according to the rules above.
72 * This will initialize d_offset to the block offset of the start of the
73 * selected partition - this offset should be added to the offset passed to
74 * the device's strategy method.
77 #define DISK_SECSIZE 512
91 * Parse disk metadata and initialise dev->d_offset.
93 extern int disk_open(struct disk_devdesc * dev);
96 * Print information about slices on a disk. For the size calculations we
97 * assume a 512 byte sector.
99 extern void disk_print(struct disk_devdesc *dev, char *prefix, int verbose);