1 /*
2 repair.c (09.03.17)
3 exFAT file system implementation library.
4
5 Free exFAT implementation.
6 Copyright (C) 2010-2023 Andrew Nayenko
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include "exfat.h"
24 #ifndef __UBOOT__
25 #include <strings.h>
26 #endif
27
28 int exfat_errors_fixed;
29
exfat_ask_to_fix(const struct exfat * ef)30 bool exfat_ask_to_fix(const struct exfat* ef)
31 {
32 const char* question = "Fix (Y/N)?";
33 #ifndef __UBOOT__
34 char answer[8];
35 bool yeah, nope;
36 #endif
37
38 switch (ef->repair)
39 {
40 case EXFAT_REPAIR_NO:
41 return false;
42 case EXFAT_REPAIR_YES:
43 printf("%s %s", question, "Y\n");
44 return true;
45 case EXFAT_REPAIR_ASK:
46 #ifndef __UBOOT__
47 do
48 {
49 printf("%s ", question);
50 fflush(stdout);
51 if (fgets(answer, sizeof(answer), stdin))
52 {
53 yeah = strcasecmp(answer, "Y\n") == 0;
54 nope = strcasecmp(answer, "N\n") == 0;
55 }
56 else
57 {
58 yeah = false;
59 nope = true;
60 }
61 }
62 while (!yeah && !nope);
63 return yeah;
64 #else
65 default:
66 /* Do not attempt to repair FS in U-Boot. */
67 return false;
68 #endif
69 }
70 exfat_bug("invalid repair option value: %d", ef->repair);
71 #ifdef __UBOOT__
72 return false;
73 #endif
74 }
75
exfat_fix_invalid_vbr_checksum(const struct exfat * ef,void * sector,uint32_t vbr_checksum)76 bool exfat_fix_invalid_vbr_checksum(const struct exfat* ef, void* sector,
77 uint32_t vbr_checksum)
78 {
79 size_t i;
80 off_t sector_size = SECTOR_SIZE(*ef->sb);
81
82 for (i = 0; i < sector_size / sizeof(vbr_checksum); i++)
83 ((le32_t*) sector)[i] = cpu_to_le32(vbr_checksum);
84 if (exfat_pwrite(ef->dev, sector, sector_size, 11 * sector_size) < 0)
85 {
86 exfat_error("failed to write correct VBR checksum");
87 return false;
88 }
89 exfat_errors_fixed++;
90 return true;
91 }
92
exfat_fix_invalid_node_checksum(UNUSED const struct exfat * ef,struct exfat_node * node)93 bool exfat_fix_invalid_node_checksum(UNUSED const struct exfat* ef,
94 struct exfat_node* node)
95 {
96 /* checksum will be rewritten by exfat_flush_node() */
97 node->is_dirty = true;
98
99 exfat_errors_fixed++;
100 return true;
101 }
102
exfat_fix_unknown_entry(struct exfat * ef,struct exfat_node * dir,const struct exfat_entry * entry,off_t offset)103 bool exfat_fix_unknown_entry(struct exfat* ef, struct exfat_node* dir,
104 const struct exfat_entry* entry, off_t offset)
105 {
106 struct exfat_entry deleted = *entry;
107
108 deleted.type &= ~EXFAT_ENTRY_VALID;
109 if (exfat_generic_pwrite(ef, dir, &deleted, sizeof(struct exfat_entry),
110 offset) != sizeof(struct exfat_entry))
111 return false;
112
113 exfat_errors_fixed++;
114 return true;
115 }
116