fs/hfsplus/part_tbl.c

4  * Copyright (C) 1996-1997  Paul H. Hargrove
8  * Original code to handle the new style Mac partition table based on
12  * a structure means that the pointer is non-NULL and the structure it
22 #define HFS_PMAP_BLK		1 /* First block of partition map */
23 #define HFS_MDB_BLK		2 /* Block (w/i partition) of MDB */
27 #define HFS_OLD_PMAP_MAGIC	0x5453 /* "TS": old-type partition map */
28 #define HFS_NEW_PMAP_MAGIC	0x504D /* "PM": new-type partition map */
33  * The new style Mac partition map
35  * For each partition on the media there is a physical block (512-byte
42 	__be32	pmMapBlkCnt;	/* partition blocks count */
43 	__be32	pmPyPartStart;	/* physical block start of partition */
44 	__be32	pmPartBlkCnt;	/* physical block count of partition */
47 				   partition */
50 				   partition */
55  * The old style Mac partition map
57  * The partition map consists for a 2-byte signature followed by an
58  * array of these structures.  The map is terminated with an all-zero
77 		struct old_pmap_entry *p = &pm->pdEntry[i];  in hfs_parse_old_pmap()
79 		if (p->pdStart && p->pdSize &&  in hfs_parse_old_pmap()
80 		    p->pdFSID == cpu_to_be32(0x54465331)/*"TFS1"*/ &&  in hfs_parse_old_pmap()
81 		    (sbi->part < 0 || sbi->part == i)) {  in hfs_parse_old_pmap()
82 			*part_start += be32_to_cpu(p->pdStart);  in hfs_parse_old_pmap()
83 			*part_size = be32_to_cpu(p->pdSize);  in hfs_parse_old_pmap()
88 	return -ENOENT;  in hfs_parse_old_pmap()
95 	int size = be32_to_cpu(pm->pmMapBlkCnt);  in hfs_parse_new_pmap()
101 		if (!memcmp(pm->pmPartType, "Apple_HFS", 9) &&  in hfs_parse_new_pmap()
102 		    (sbi->part < 0 || sbi->part == i)) {  in hfs_parse_new_pmap()
103 			*part_start += be32_to_cpu(pm->pmPyPartStart);  in hfs_parse_new_pmap()
104 			*part_size = be32_to_cpu(pm->pmPartBlkCnt);  in hfs_parse_new_pmap()
109 			return -ENOENT;  in hfs_parse_new_pmap()
112 		if ((u8 *)pm - (u8 *)buf >= buf_size) {  in hfs_parse_new_pmap()
119 	} while (pm->pmSig == cpu_to_be16(HFS_NEW_PMAP_MAGIC));  in hfs_parse_new_pmap()
121 	return -ENOENT;  in hfs_parse_new_pmap()
125  * Parse the partition map looking for the start and length of a
126  * HFS/HFS+ partition.
136 		return -ENOMEM;  in hfs_part_find()
151 		res = -ENOENT;  in hfs_part_find()