2 * Copyright (c) 2011 Google, Inc.
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30 * Device descriptor for partitioned disks. To use, set the
31 * d_slice and d_partition variables as follows:
35 * d_slice = D_SLICENONE
36 * d_partition = <doesn't matter>
40 * d_slice = MBR slice number (typically 1..4)
41 * d_partition = D_PARTNONE
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 or D_PARTWILD)
48 * BSD disklabel partition on the true dedicated disk:
50 * d_slice = D_SLICENONE
51 * d_partition = disklabel partition (typically 0..19 or D_PARTWILD)
55 * d_slice = GPT partition number (typically 1..N)
56 * d_partition = D_PARTISGPT
58 * For MBR, setting d_partition to D_PARTWILD will automatically use the first
59 * partition within the slice.
61 * For both MBR and GPT, to automatically find the 'best' slice and partition,
62 * set d_slice to D_SLICEWILD. This uses the partition type to decide which
63 * partition to use according to the following list of preferences:
69 * DOS/Windows (active)
70 * DOS/Windows (inactive)
72 * Active MBR slices (marked as bootable) are preferred over inactive. GPT
73 * doesn't have the concept of active/inactive partitions. In both MBR and GPT,
74 * if there are multiple slices/partitions of a given type, the first one
77 * The low-level disk device will typically call disk_open() from its open
78 * method to interpret the disk partition tables according to the rules above.
79 * This will initialize d_offset to the block offset of the start of the
80 * selected partition - this offset should be added to the offset passed to
81 * the device's strategy method.
87 #define D_SLICENONE -1
91 #define D_PARTISGPT 255
94 struct devdesc dd; /* Must be first. */
106 * Parse disk metadata and initialise dev->d_offset.
108 extern int disk_open(struct disk_devdesc *, uint64_t, u_int);
109 extern int disk_close(struct disk_devdesc *);
110 extern int disk_ioctl(struct disk_devdesc *, u_long, void *);
111 extern int disk_read(struct disk_devdesc *, void *, uint64_t, u_int);
112 extern int disk_write(struct disk_devdesc *, void *, uint64_t, u_int);
113 extern int ptblread(void *, void *, size_t, uint64_t);
116 * Print information about slices on a disk.
118 extern int disk_print(struct disk_devdesc *, char *, int);
119 extern char* disk_fmtdev(struct disk_devdesc *);
120 extern int disk_parsedev(struct disk_devdesc *, const char *, const char **);