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bab55417 CZ |
1 | /* |
2 | * Copyright (C) 2013 HUAWEI | |
3 | * Author: Cai Zhiyong <caizhiyong@huawei.com> | |
4 | * | |
080506ad PG |
5 | * Read block device partition table from the command line. |
6 | * Typically used for fixed block (eMMC) embedded devices. | |
7 | * It has no MBR, so saves storage space. Bootloader can be easily accessed | |
bab55417 CZ |
8 | * by absolute address of data on the block device. |
9 | * Users can easily change the partition. | |
10 | * | |
11 | * The format for the command line is just like mtdparts. | |
12 | * | |
080506ad | 13 | * For further information, see "Documentation/block/cmdline-partition.txt" |
bab55417 CZ |
14 | * |
15 | */ | |
16 | ||
17 | #include <linux/cmdline-parser.h> | |
18 | ||
19 | #include "check.h" | |
20 | #include "cmdline.h" | |
21 | ||
22 | static char *cmdline; | |
23 | static struct cmdline_parts *bdev_parts; | |
24 | ||
25 | static int add_part(int slot, struct cmdline_subpart *subpart, void *param) | |
26 | { | |
27 | int label_min; | |
28 | struct partition_meta_info *info; | |
29 | char tmp[sizeof(info->volname) + 4]; | |
30 | struct parsed_partitions *state = (struct parsed_partitions *)param; | |
31 | ||
32 | if (slot >= state->limit) | |
33 | return 1; | |
34 | ||
35 | put_partition(state, slot, subpart->from >> 9, | |
36 | subpart->size >> 9); | |
37 | ||
38 | info = &state->parts[slot].info; | |
39 | ||
40 | label_min = min_t(int, sizeof(info->volname) - 1, | |
41 | sizeof(subpart->name)); | |
42 | strncpy(info->volname, subpart->name, label_min); | |
43 | info->volname[label_min] = '\0'; | |
44 | ||
45 | snprintf(tmp, sizeof(tmp), "(%s)", info->volname); | |
46 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
47 | ||
48 | state->parts[slot].has_info = true; | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int __init cmdline_parts_setup(char *s) | |
54 | { | |
55 | cmdline = s; | |
56 | return 1; | |
57 | } | |
58 | __setup("blkdevparts=", cmdline_parts_setup); | |
59 | ||
60 | /* | |
61 | * Purpose: allocate cmdline partitions. | |
62 | * Returns: | |
63 | * -1 if unable to read the partition table | |
64 | * 0 if this isn't our partition table | |
65 | * 1 if successful | |
66 | */ | |
67 | int cmdline_partition(struct parsed_partitions *state) | |
68 | { | |
69 | sector_t disk_size; | |
70 | char bdev[BDEVNAME_SIZE]; | |
71 | struct cmdline_parts *parts; | |
72 | ||
73 | if (cmdline) { | |
74 | if (bdev_parts) | |
75 | cmdline_parts_free(&bdev_parts); | |
76 | ||
77 | if (cmdline_parts_parse(&bdev_parts, cmdline)) { | |
78 | cmdline = NULL; | |
79 | return -1; | |
80 | } | |
81 | cmdline = NULL; | |
82 | } | |
83 | ||
84 | if (!bdev_parts) | |
85 | return 0; | |
86 | ||
87 | bdevname(state->bdev, bdev); | |
88 | parts = cmdline_parts_find(bdev_parts, bdev); | |
89 | if (!parts) | |
90 | return 0; | |
91 | ||
92 | disk_size = get_capacity(state->bdev->bd_disk) << 9; | |
93 | ||
94 | cmdline_parts_set(parts, disk_size, 1, add_part, (void *)state); | |
95 | ||
96 | strlcat(state->pp_buf, "\n", PAGE_SIZE); | |
97 | ||
98 | return 1; | |
99 | } |