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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | /* Here we keep miscellaneous functions which are used all over the UBI code */ | |
22 | ||
23 | #include "ubi.h" | |
24 | ||
25 | /** | |
26 | * calc_data_len - calculate how much real data is stored in a buffer. | |
27 | * @ubi: UBI device description object | |
28 | * @buf: a buffer with the contents of the physical eraseblock | |
29 | * @length: the buffer length | |
30 | * | |
31 | * This function calculates how much "real data" is stored in @buf and returnes | |
32 | * the length. Continuous 0xFF bytes at the end of the buffer are not | |
33 | * considered as "real data". | |
34 | */ | |
35 | int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf, | |
36 | int length) | |
37 | { | |
38 | int i; | |
39 | ||
cadb40cc | 40 | ubi_assert(!(length & (ubi->min_io_size - 1))); |
801c135c AB |
41 | |
42 | for (i = length - 1; i >= 0; i--) | |
43 | if (((const uint8_t *)buf)[i] != 0xFF) | |
44 | break; | |
45 | ||
46 | /* The resulting length must be aligned to the minimum flash I/O size */ | |
47 | length = ALIGN(i + 1, ubi->min_io_size); | |
48 | return length; | |
49 | } | |
50 | ||
51 | /** | |
52 | * ubi_check_volume - check the contents of a static volume. | |
53 | * @ubi: UBI device description object | |
54 | * @vol_id: ID of the volume to check | |
55 | * | |
56 | * This function checks if static volume @vol_id is corrupted by fully reading | |
57 | * it and checking data CRC. This function returns %0 if the volume is not | |
58 | * corrupted, %1 if it is corrupted and a negative error code in case of | |
59 | * failure. Dynamic volumes are not checked and zero is returned immediately. | |
60 | */ | |
61 | int ubi_check_volume(struct ubi_device *ubi, int vol_id) | |
62 | { | |
63 | void *buf; | |
64 | int err = 0, i; | |
65 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
66 | ||
67 | if (vol->vol_type != UBI_STATIC_VOLUME) | |
68 | return 0; | |
69 | ||
92ad8f37 | 70 | buf = vmalloc(vol->usable_leb_size); |
801c135c AB |
71 | if (!buf) |
72 | return -ENOMEM; | |
73 | ||
74 | for (i = 0; i < vol->used_ebs; i++) { | |
75 | int size; | |
76 | ||
9aa272b4 | 77 | cond_resched(); |
78 | ||
801c135c AB |
79 | if (i == vol->used_ebs - 1) |
80 | size = vol->last_eb_bytes; | |
81 | else | |
82 | size = vol->usable_leb_size; | |
83 | ||
89b96b69 | 84 | err = ubi_eba_read_leb(ubi, vol, i, buf, 0, size, 1); |
801c135c | 85 | if (err) { |
d57f4054 | 86 | if (mtd_is_eccerr(err)) |
801c135c AB |
87 | err = 1; |
88 | break; | |
89 | } | |
90 | } | |
91 | ||
92ad8f37 | 92 | vfree(buf); |
801c135c AB |
93 | return err; |
94 | } | |
95 | ||
87e773c9 SL |
96 | /** |
97 | * ubi_update_reserved - update bad eraseblock handling accounting data. | |
98 | * @ubi: UBI device description object | |
99 | * | |
100 | * This function calculates the gap between current number of PEBs reserved for | |
101 | * bad eraseblock handling and the required level of PEBs that must be | |
102 | * reserved, and if necessary, reserves more PEBs to fill that gap, according | |
103 | * to availability. Should be called with ubi->volumes_lock held. | |
104 | */ | |
105 | void ubi_update_reserved(struct ubi_device *ubi) | |
106 | { | |
107 | int need = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
108 | ||
109 | if (need <= 0 || ubi->avail_pebs == 0) | |
110 | return; | |
111 | ||
112 | need = min_t(int, need, ubi->avail_pebs); | |
113 | ubi->avail_pebs -= need; | |
114 | ubi->rsvd_pebs += need; | |
115 | ubi->beb_rsvd_pebs += need; | |
32608703 | 116 | ubi_msg(ubi, "reserved more %d PEBs for bad PEB handling", need); |
87e773c9 SL |
117 | } |
118 | ||
801c135c | 119 | /** |
5c669a5b | 120 | * ubi_calculate_reserved - calculate how many PEBs must be reserved for bad |
801c135c AB |
121 | * eraseblock handling. |
122 | * @ubi: UBI device description object | |
123 | */ | |
124 | void ubi_calculate_reserved(struct ubi_device *ubi) | |
125 | { | |
37f758a0 SL |
126 | /* |
127 | * Calculate the actual number of PEBs currently needed to be reserved | |
128 | * for future bad eraseblock handling. | |
129 | */ | |
130 | ubi->beb_rsvd_level = ubi->bad_peb_limit - ubi->bad_peb_count; | |
131 | if (ubi->beb_rsvd_level < 0) { | |
132 | ubi->beb_rsvd_level = 0; | |
32608703 | 133 | ubi_warn(ubi, "number of bad PEBs (%d) is above the expected limit (%d), not reserving any PEBs for bad PEB handling, will use available PEBs (if any)", |
37f758a0 SL |
134 | ubi->bad_peb_count, ubi->bad_peb_limit); |
135 | } | |
801c135c | 136 | } |
bb00e180 AB |
137 | |
138 | /** | |
139 | * ubi_check_pattern - check if buffer contains only a certain byte pattern. | |
140 | * @buf: buffer to check | |
141 | * @patt: the pattern to check | |
142 | * @size: buffer size in bytes | |
143 | * | |
144 | * This function returns %1 in there are only @patt bytes in @buf, and %0 if | |
145 | * something else was also found. | |
146 | */ | |
147 | int ubi_check_pattern(const void *buf, uint8_t patt, int size) | |
148 | { | |
149 | int i; | |
150 | ||
151 | for (i = 0; i < size; i++) | |
152 | if (((const uint8_t *)buf)[i] != patt) | |
153 | return 0; | |
154 | return 1; | |
155 | } | |
58d303de JP |
156 | |
157 | /* Normal UBI messages */ | |
158 | void ubi_msg(const struct ubi_device *ubi, const char *fmt, ...) | |
159 | { | |
160 | struct va_format vaf; | |
161 | va_list args; | |
162 | ||
163 | va_start(args, fmt); | |
164 | ||
165 | vaf.fmt = fmt; | |
166 | vaf.va = &args; | |
167 | ||
168 | pr_notice(UBI_NAME_STR "%d: %pV\n", ubi->ubi_num, &vaf); | |
169 | ||
170 | va_end(args); | |
171 | } | |
172 | ||
173 | /* UBI warning messages */ | |
174 | void ubi_warn(const struct ubi_device *ubi, const char *fmt, ...) | |
175 | { | |
176 | struct va_format vaf; | |
177 | va_list args; | |
178 | ||
179 | va_start(args, fmt); | |
180 | ||
181 | vaf.fmt = fmt; | |
182 | vaf.va = &args; | |
183 | ||
184 | pr_warn(UBI_NAME_STR "%d warning: %ps: %pV\n", | |
185 | ubi->ubi_num, __builtin_return_address(0), &vaf); | |
186 | ||
187 | va_end(args); | |
188 | } | |
189 | ||
190 | /* UBI error messages */ | |
191 | void ubi_err(const struct ubi_device *ubi, const char *fmt, ...) | |
192 | { | |
193 | struct va_format vaf; | |
194 | va_list args; | |
195 | ||
196 | va_start(args, fmt); | |
197 | ||
198 | vaf.fmt = fmt; | |
199 | vaf.va = &args; | |
200 | ||
201 | pr_err(UBI_NAME_STR "%d error: %ps: %pV\n", | |
202 | ubi->ubi_num, __builtin_return_address(0), &vaf); | |
203 | va_end(args); | |
204 | } |