Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 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 | /* |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 22 | * UBI attaching sub-system. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 23 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 24 | * This sub-system is responsible for attaching MTD devices and it also |
| 25 | * implements flash media scanning. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 26 | * |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 27 | * The attaching information is represented by a &struct ubi_attach_info' |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 28 | * object. Information about volumes is represented by &struct ubi_ainf_volume |
| 29 | * objects which are kept in volume RB-tree with root at the @volumes field. |
| 30 | * The RB-tree is indexed by the volume ID. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 31 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 32 | * Logical eraseblocks are represented by &struct ubi_ainf_peb objects. These |
| 33 | * objects are kept in per-volume RB-trees with the root at the corresponding |
| 34 | * &struct ubi_ainf_volume object. To put it differently, we keep an RB-tree of |
| 35 | * per-volume objects and each of these objects is the root of RB-tree of |
| 36 | * per-LEB objects. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 37 | * |
| 38 | * Corrupted physical eraseblocks are put to the @corr list, free physical |
| 39 | * eraseblocks are put to the @free list and the physical eraseblock to be |
| 40 | * erased are put to the @erase list. |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 41 | * |
Artem Bityutskiy | fef2deb | 2010-10-29 08:34:50 +0300 | [diff] [blame] | 42 | * About corruptions |
| 43 | * ~~~~~~~~~~~~~~~~~ |
| 44 | * |
| 45 | * UBI protects EC and VID headers with CRC-32 checksums, so it can detect |
| 46 | * whether the headers are corrupted or not. Sometimes UBI also protects the |
| 47 | * data with CRC-32, e.g., when it executes the atomic LEB change operation, or |
| 48 | * when it moves the contents of a PEB for wear-leveling purposes. |
| 49 | * |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 50 | * UBI tries to distinguish between 2 types of corruptions. |
Artem Bityutskiy | fef2deb | 2010-10-29 08:34:50 +0300 | [diff] [blame] | 51 | * |
| 52 | * 1. Corruptions caused by power cuts. These are expected corruptions and UBI |
| 53 | * tries to handle them gracefully, without printing too many warnings and |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 54 | * error messages. The idea is that we do not lose important data in these |
| 55 | * cases - we may lose only the data which were being written to the media just |
| 56 | * before the power cut happened, and the upper layers (e.g., UBIFS) are |
| 57 | * supposed to handle such data losses (e.g., by using the FS journal). |
Artem Bityutskiy | fef2deb | 2010-10-29 08:34:50 +0300 | [diff] [blame] | 58 | * |
| 59 | * When UBI detects a corruption (CRC-32 mismatch) in a PEB, and it looks like |
| 60 | * the reason is a power cut, UBI puts this PEB to the @erase list, and all |
| 61 | * PEBs in the @erase list are scheduled for erasure later. |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 62 | * |
| 63 | * 2. Unexpected corruptions which are not caused by power cuts. During |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 64 | * attaching, such PEBs are put to the @corr list and UBI preserves them. |
Artem Bityutskiy | fef2deb | 2010-10-29 08:34:50 +0300 | [diff] [blame] | 65 | * Obviously, this lessens the amount of available PEBs, and if at some point |
| 66 | * UBI runs out of free PEBs, it switches to R/O mode. UBI also loudly informs |
| 67 | * about such PEBs every time the MTD device is attached. |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 68 | * |
| 69 | * However, it is difficult to reliably distinguish between these types of |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 70 | * corruptions and UBI's strategy is as follows (in case of attaching by |
| 71 | * scanning). UBI assumes corruption type 2 if the VID header is corrupted and |
| 72 | * the data area does not contain all 0xFFs, and there were no bit-flips or |
| 73 | * integrity errors (e.g., ECC errors in case of NAND) while reading the data |
| 74 | * area. Otherwise UBI assumes corruption type 1. So the decision criteria |
| 75 | * are as follows. |
| 76 | * o If the data area contains only 0xFFs, there are no data, and it is safe |
Artem Bityutskiy | fef2deb | 2010-10-29 08:34:50 +0300 | [diff] [blame] | 77 | * to just erase this PEB - this is corruption type 1. |
| 78 | * o If the data area has bit-flips or data integrity errors (ECC errors on |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 79 | * NAND), it is probably a PEB which was being erased when power cut |
Artem Bityutskiy | fef2deb | 2010-10-29 08:34:50 +0300 | [diff] [blame] | 80 | * happened, so this is corruption type 1. However, this is just a guess, |
| 81 | * which might be wrong. |
Brian Norris | 55393ba | 2012-08-31 14:43:41 -0700 | [diff] [blame] | 82 | * o Otherwise this is corruption type 2. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 83 | */ |
| 84 | |
| 85 | #include <linux/err.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 86 | #include <linux/slab.h> |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 87 | #include <linux/crc32.h> |
Artem Bityutskiy | 3013ee3 | 2009-01-16 19:08:43 +0200 | [diff] [blame] | 88 | #include <linux/math64.h> |
Matthieu CASTET | 095751a | 2010-06-03 16:14:27 +0200 | [diff] [blame] | 89 | #include <linux/random.h> |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 90 | #include "ubi.h" |
| 91 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 92 | static int self_check_ai(struct ubi_device *ubi, struct ubi_attach_info *ai); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 93 | |
| 94 | /* Temporary variables used during scanning */ |
| 95 | static struct ubi_ec_hdr *ech; |
| 96 | static struct ubi_vid_hdr *vidh; |
| 97 | |
Artem Bityutskiy | 941dfb0 | 2007-05-05 16:33:13 +0300 | [diff] [blame] | 98 | /** |
Artem Bityutskiy | 78d87c9 | 2007-05-05 11:24:02 +0300 | [diff] [blame] | 99 | * add_to_list - add physical eraseblock to a list. |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 100 | * @ai: attaching information |
Artem Bityutskiy | 78d87c9 | 2007-05-05 11:24:02 +0300 | [diff] [blame] | 101 | * @pnum: physical eraseblock number to add |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 102 | * @vol_id: the last used volume id for the PEB |
| 103 | * @lnum: the last used LEB number for the PEB |
Artem Bityutskiy | 78d87c9 | 2007-05-05 11:24:02 +0300 | [diff] [blame] | 104 | * @ec: erase counter of the physical eraseblock |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 105 | * @to_head: if not zero, add to the head of the list |
Artem Bityutskiy | 78d87c9 | 2007-05-05 11:24:02 +0300 | [diff] [blame] | 106 | * @list: the list to add to |
| 107 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 108 | * This function allocates a 'struct ubi_ainf_peb' object for physical |
| 109 | * eraseblock @pnum and adds it to the "free", "erase", or "alien" lists. |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 110 | * It stores the @lnum and @vol_id alongside, which can both be |
| 111 | * %UBI_UNKNOWN if they are not available, not readable, or not assigned. |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 112 | * If @to_head is not zero, PEB will be added to the head of the list, which |
| 113 | * basically means it will be processed first later. E.g., we add corrupted |
| 114 | * PEBs (corrupted due to power cuts) to the head of the erase list to make |
| 115 | * sure we erase them first and get rid of corruptions ASAP. This function |
| 116 | * returns zero in case of success and a negative error code in case of |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 117 | * failure. |
Artem Bityutskiy | 78d87c9 | 2007-05-05 11:24:02 +0300 | [diff] [blame] | 118 | */ |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 119 | static int add_to_list(struct ubi_attach_info *ai, int pnum, int vol_id, |
| 120 | int lnum, int ec, int to_head, struct list_head *list) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 121 | { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 122 | struct ubi_ainf_peb *aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 123 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 124 | if (list == &ai->free) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 125 | dbg_bld("add to free: PEB %d, EC %d", pnum, ec); |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 126 | } else if (list == &ai->erase) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 127 | dbg_bld("add to erase: PEB %d, EC %d", pnum, ec); |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 128 | } else if (list == &ai->alien) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 129 | dbg_bld("add to alien: PEB %d, EC %d", pnum, ec); |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 130 | ai->alien_peb_count += 1; |
Artem Bityutskiy | 33789fb | 2010-04-30 12:31:26 +0300 | [diff] [blame] | 131 | } else |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 132 | BUG(); |
| 133 | |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 134 | aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 135 | if (!aeb) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 136 | return -ENOMEM; |
| 137 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 138 | aeb->pnum = pnum; |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 139 | aeb->vol_id = vol_id; |
| 140 | aeb->lnum = lnum; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 141 | aeb->ec = ec; |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 142 | if (to_head) |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 143 | list_add(&aeb->u.list, list); |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 144 | else |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 145 | list_add_tail(&aeb->u.list, list); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | /** |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 150 | * add_corrupted - add a corrupted physical eraseblock. |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 151 | * @ai: attaching information |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 152 | * @pnum: physical eraseblock number to add |
| 153 | * @ec: erase counter of the physical eraseblock |
| 154 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 155 | * This function allocates a 'struct ubi_ainf_peb' object for a corrupted |
| 156 | * physical eraseblock @pnum and adds it to the 'corr' list. The corruption |
| 157 | * was presumably not caused by a power cut. Returns zero in case of success |
| 158 | * and a negative error code in case of failure. |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 159 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 160 | static int add_corrupted(struct ubi_attach_info *ai, int pnum, int ec) |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 161 | { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 162 | struct ubi_ainf_peb *aeb; |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 163 | |
| 164 | dbg_bld("add to corrupted: PEB %d, EC %d", pnum, ec); |
| 165 | |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 166 | aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 167 | if (!aeb) |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 168 | return -ENOMEM; |
| 169 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 170 | ai->corr_peb_count += 1; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 171 | aeb->pnum = pnum; |
| 172 | aeb->ec = ec; |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 173 | list_add(&aeb->u.list, &ai->corr); |
Artem Bityutskiy | 3fb3412 | 2010-09-03 15:36:12 +0300 | [diff] [blame] | 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | /** |
Artem Bityutskiy | ebaaf1a | 2008-07-18 13:34:32 +0300 | [diff] [blame] | 178 | * validate_vid_hdr - check volume identifier header. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 179 | * @vid_hdr: the volume identifier header to check |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 180 | * @av: information about the volume this logical eraseblock belongs to |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 181 | * @pnum: physical eraseblock number the VID header came from |
| 182 | * |
| 183 | * This function checks that data stored in @vid_hdr is consistent. Returns |
| 184 | * non-zero if an inconsistency was found and zero if not. |
| 185 | * |
| 186 | * Note, UBI does sanity check of everything it reads from the flash media. |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 187 | * Most of the checks are done in the I/O sub-system. Here we check that the |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 188 | * information in the VID header is consistent to the information in other VID |
| 189 | * headers of the same volume. |
| 190 | */ |
| 191 | static int validate_vid_hdr(const struct ubi_vid_hdr *vid_hdr, |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 192 | const struct ubi_ainf_volume *av, int pnum) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 193 | { |
| 194 | int vol_type = vid_hdr->vol_type; |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 195 | int vol_id = be32_to_cpu(vid_hdr->vol_id); |
| 196 | int used_ebs = be32_to_cpu(vid_hdr->used_ebs); |
| 197 | int data_pad = be32_to_cpu(vid_hdr->data_pad); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 198 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 199 | if (av->leb_count != 0) { |
| 200 | int av_vol_type; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 201 | |
| 202 | /* |
| 203 | * This is not the first logical eraseblock belonging to this |
| 204 | * volume. Ensure that the data in its VID header is consistent |
| 205 | * to the data in previous logical eraseblock headers. |
| 206 | */ |
| 207 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 208 | if (vol_id != av->vol_id) { |
Artem Bityutskiy | e298682 | 2012-05-16 18:39:56 +0300 | [diff] [blame] | 209 | ubi_err("inconsistent vol_id"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 210 | goto bad; |
| 211 | } |
| 212 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 213 | if (av->vol_type == UBI_STATIC_VOLUME) |
| 214 | av_vol_type = UBI_VID_STATIC; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 215 | else |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 216 | av_vol_type = UBI_VID_DYNAMIC; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 217 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 218 | if (vol_type != av_vol_type) { |
Artem Bityutskiy | e298682 | 2012-05-16 18:39:56 +0300 | [diff] [blame] | 219 | ubi_err("inconsistent vol_type"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 220 | goto bad; |
| 221 | } |
| 222 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 223 | if (used_ebs != av->used_ebs) { |
Artem Bityutskiy | e298682 | 2012-05-16 18:39:56 +0300 | [diff] [blame] | 224 | ubi_err("inconsistent used_ebs"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 225 | goto bad; |
| 226 | } |
| 227 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 228 | if (data_pad != av->data_pad) { |
Artem Bityutskiy | e298682 | 2012-05-16 18:39:56 +0300 | [diff] [blame] | 229 | ubi_err("inconsistent data_pad"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 230 | goto bad; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | return 0; |
| 235 | |
| 236 | bad: |
| 237 | ubi_err("inconsistent VID header at PEB %d", pnum); |
Artem Bityutskiy | a904e3f | 2012-04-25 09:02:44 +0300 | [diff] [blame] | 238 | ubi_dump_vid_hdr(vid_hdr); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 239 | ubi_dump_av(av); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 240 | return -EINVAL; |
| 241 | } |
| 242 | |
| 243 | /** |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 244 | * add_volume - add volume to the attaching information. |
| 245 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 246 | * @vol_id: ID of the volume to add |
| 247 | * @pnum: physical eraseblock number |
| 248 | * @vid_hdr: volume identifier header |
| 249 | * |
| 250 | * If the volume corresponding to the @vid_hdr logical eraseblock is already |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 251 | * present in the attaching information, this function does nothing. Otherwise |
| 252 | * it adds corresponding volume to the attaching information. Returns a pointer |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 253 | * to the allocated "av" object in case of success and a negative error code in |
| 254 | * case of failure. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 255 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 256 | static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai, |
Artem Bityutskiy | afc15a8 | 2012-05-17 07:46:17 +0300 | [diff] [blame] | 257 | int vol_id, int pnum, |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 258 | const struct ubi_vid_hdr *vid_hdr) |
| 259 | { |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 260 | struct ubi_ainf_volume *av; |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 261 | struct rb_node **p = &ai->volumes.rb_node, *parent = NULL; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 262 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 263 | ubi_assert(vol_id == be32_to_cpu(vid_hdr->vol_id)); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 264 | |
| 265 | /* Walk the volume RB-tree to look if this volume is already present */ |
| 266 | while (*p) { |
| 267 | parent = *p; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 268 | av = rb_entry(parent, struct ubi_ainf_volume, rb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 269 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 270 | if (vol_id == av->vol_id) |
| 271 | return av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 272 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 273 | if (vol_id > av->vol_id) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 274 | p = &(*p)->rb_left; |
| 275 | else |
| 276 | p = &(*p)->rb_right; |
| 277 | } |
| 278 | |
| 279 | /* The volume is absent - add it */ |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 280 | av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL); |
| 281 | if (!av) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 282 | return ERR_PTR(-ENOMEM); |
| 283 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 284 | av->highest_lnum = av->leb_count = 0; |
| 285 | av->vol_id = vol_id; |
| 286 | av->root = RB_ROOT; |
| 287 | av->used_ebs = be32_to_cpu(vid_hdr->used_ebs); |
| 288 | av->data_pad = be32_to_cpu(vid_hdr->data_pad); |
| 289 | av->compat = vid_hdr->compat; |
| 290 | av->vol_type = vid_hdr->vol_type == UBI_VID_DYNAMIC ? UBI_DYNAMIC_VOLUME |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 291 | : UBI_STATIC_VOLUME; |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 292 | if (vol_id > ai->highest_vol_id) |
| 293 | ai->highest_vol_id = vol_id; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 294 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 295 | rb_link_node(&av->rb, parent, p); |
| 296 | rb_insert_color(&av->rb, &ai->volumes); |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 297 | ai->vols_found += 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 298 | dbg_bld("added volume %d", vol_id); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 299 | return av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | /** |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 303 | * ubi_compare_lebs - find out which logical eraseblock is newer. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 304 | * @ubi: UBI device description object |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 305 | * @aeb: first logical eraseblock to compare |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 306 | * @pnum: physical eraseblock number of the second logical eraseblock to |
| 307 | * compare |
| 308 | * @vid_hdr: volume identifier header of the second logical eraseblock |
| 309 | * |
| 310 | * This function compares 2 copies of a LEB and informs which one is newer. In |
| 311 | * case of success this function returns a positive value, in case of failure, a |
| 312 | * negative error code is returned. The success return codes use the following |
| 313 | * bits: |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 314 | * o bit 0 is cleared: the first PEB (described by @aeb) is newer than the |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 315 | * second PEB (described by @pnum and @vid_hdr); |
| 316 | * o bit 0 is set: the second PEB is newer; |
| 317 | * o bit 1 is cleared: no bit-flips were detected in the newer LEB; |
| 318 | * o bit 1 is set: bit-flips were detected in the newer LEB; |
| 319 | * o bit 2 is cleared: the older LEB is not corrupted; |
| 320 | * o bit 2 is set: the older LEB is corrupted. |
| 321 | */ |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 322 | int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, |
Artem Bityutskiy | e88d6e10 | 2007-08-29 14:51:52 +0300 | [diff] [blame] | 323 | int pnum, const struct ubi_vid_hdr *vid_hdr) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 324 | { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 325 | int len, err, second_is_newer, bitflips = 0, corrupted = 0; |
| 326 | uint32_t data_crc, crc; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 327 | struct ubi_vid_hdr *vh = NULL; |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 328 | unsigned long long sqnum2 = be64_to_cpu(vid_hdr->sqnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 329 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 330 | if (sqnum2 == aeb->sqnum) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 331 | /* |
Artem Bityutskiy | 9869cd8 | 2008-07-18 13:53:39 +0300 | [diff] [blame] | 332 | * This must be a really ancient UBI image which has been |
| 333 | * created before sequence numbers support has been added. At |
| 334 | * that times we used 32-bit LEB versions stored in logical |
| 335 | * eraseblocks. That was before UBI got into mainline. We do not |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 336 | * support these images anymore. Well, those images still work, |
| 337 | * but only if no unclean reboots happened. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 338 | */ |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 339 | ubi_err("unsupported on-flash UBI format"); |
Artem Bityutskiy | 9869cd8 | 2008-07-18 13:53:39 +0300 | [diff] [blame] | 340 | return -EINVAL; |
| 341 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 342 | |
Artem Bityutskiy | 9869cd8 | 2008-07-18 13:53:39 +0300 | [diff] [blame] | 343 | /* Obviously the LEB with lower sequence counter is older */ |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 344 | second_is_newer = (sqnum2 > aeb->sqnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 345 | |
| 346 | /* |
| 347 | * Now we know which copy is newer. If the copy flag of the PEB with |
| 348 | * newer version is not set, then we just return, otherwise we have to |
| 349 | * check data CRC. For the second PEB we already have the VID header, |
| 350 | * for the first one - we'll need to re-read it from flash. |
| 351 | * |
Artem Bityutskiy | 9869cd8 | 2008-07-18 13:53:39 +0300 | [diff] [blame] | 352 | * Note: this may be optimized so that we wouldn't read twice. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 353 | */ |
| 354 | |
| 355 | if (second_is_newer) { |
| 356 | if (!vid_hdr->copy_flag) { |
| 357 | /* It is not a copy, so it is newer */ |
| 358 | dbg_bld("second PEB %d is newer, copy_flag is unset", |
| 359 | pnum); |
| 360 | return 1; |
| 361 | } |
| 362 | } else { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 363 | if (!aeb->copy_flag) { |
Artem Bityutskiy | fb22b59 | 2010-10-19 22:00:11 +0300 | [diff] [blame] | 364 | /* It is not a copy, so it is newer */ |
| 365 | dbg_bld("first PEB %d is newer, copy_flag is unset", |
| 366 | pnum); |
| 367 | return bitflips << 1; |
| 368 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 369 | |
Artem Bityutskiy | 33818bb | 2007-08-28 21:29:32 +0300 | [diff] [blame] | 370 | vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 371 | if (!vh) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 372 | return -ENOMEM; |
| 373 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 374 | pnum = aeb->pnum; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 375 | err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 376 | if (err) { |
| 377 | if (err == UBI_IO_BITFLIPS) |
| 378 | bitflips = 1; |
| 379 | else { |
Artem Bityutskiy | 049333c | 2012-08-27 14:43:54 +0300 | [diff] [blame] | 380 | ubi_err("VID of PEB %d header is bad, but it was OK earlier, err %d", |
| 381 | pnum, err); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 382 | if (err > 0) |
| 383 | err = -EIO; |
| 384 | |
| 385 | goto out_free_vidh; |
| 386 | } |
| 387 | } |
| 388 | |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 389 | vid_hdr = vh; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | /* Read the data of the copy and check the CRC */ |
| 393 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 394 | len = be32_to_cpu(vid_hdr->data_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 395 | |
Artem Bityutskiy | d125a75 | 2012-10-26 16:11:26 +0300 | [diff] [blame] | 396 | mutex_lock(&ubi->buf_mutex); |
| 397 | err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, len); |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 398 | if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err)) |
Artem Bityutskiy | d125a75 | 2012-10-26 16:11:26 +0300 | [diff] [blame] | 399 | goto out_unlock; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 400 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 401 | data_crc = be32_to_cpu(vid_hdr->data_crc); |
Artem Bityutskiy | d125a75 | 2012-10-26 16:11:26 +0300 | [diff] [blame] | 402 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 403 | if (crc != data_crc) { |
| 404 | dbg_bld("PEB %d CRC error: calculated %#08x, must be %#08x", |
| 405 | pnum, crc, data_crc); |
| 406 | corrupted = 1; |
| 407 | bitflips = 0; |
| 408 | second_is_newer = !second_is_newer; |
| 409 | } else { |
| 410 | dbg_bld("PEB %d CRC is OK", pnum); |
| 411 | bitflips = !!err; |
| 412 | } |
Artem Bityutskiy | d125a75 | 2012-10-26 16:11:26 +0300 | [diff] [blame] | 413 | mutex_unlock(&ubi->buf_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 414 | |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 415 | ubi_free_vid_hdr(ubi, vh); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 416 | |
| 417 | if (second_is_newer) |
| 418 | dbg_bld("second PEB %d is newer, copy_flag is set", pnum); |
| 419 | else |
| 420 | dbg_bld("first PEB %d is newer, copy_flag is set", pnum); |
| 421 | |
| 422 | return second_is_newer | (bitflips << 1) | (corrupted << 2); |
| 423 | |
Artem Bityutskiy | d125a75 | 2012-10-26 16:11:26 +0300 | [diff] [blame] | 424 | out_unlock: |
| 425 | mutex_unlock(&ubi->buf_mutex); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 426 | out_free_vidh: |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 427 | ubi_free_vid_hdr(ubi, vh); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 428 | return err; |
| 429 | } |
| 430 | |
| 431 | /** |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 432 | * ubi_add_to_av - add used physical eraseblock to the attaching information. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 433 | * @ubi: UBI device description object |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 434 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 435 | * @pnum: the physical eraseblock number |
| 436 | * @ec: erase counter |
| 437 | * @vid_hdr: the volume identifier header |
| 438 | * @bitflips: if bit-flips were detected when this physical eraseblock was read |
| 439 | * |
Artem Bityutskiy | 79b510c | 2007-05-05 17:36:17 +0300 | [diff] [blame] | 440 | * This function adds information about a used physical eraseblock to the |
| 441 | * 'used' tree of the corresponding volume. The function is rather complex |
| 442 | * because it has to handle cases when this is not the first physical |
| 443 | * eraseblock belonging to the same logical eraseblock, and the newer one has |
| 444 | * to be picked, while the older one has to be dropped. This function returns |
| 445 | * zero in case of success and a negative error code in case of failure. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 446 | */ |
Artem Bityutskiy | 3561188 | 2012-05-17 15:31:31 +0300 | [diff] [blame] | 447 | int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, |
| 448 | int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 449 | { |
| 450 | int err, vol_id, lnum; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 451 | unsigned long long sqnum; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 452 | struct ubi_ainf_volume *av; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 453 | struct ubi_ainf_peb *aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 454 | struct rb_node **p, *parent = NULL; |
| 455 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 456 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
| 457 | lnum = be32_to_cpu(vid_hdr->lnum); |
| 458 | sqnum = be64_to_cpu(vid_hdr->sqnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 459 | |
Artem Bityutskiy | 9869cd8 | 2008-07-18 13:53:39 +0300 | [diff] [blame] | 460 | dbg_bld("PEB %d, LEB %d:%d, EC %d, sqnum %llu, bitflips %d", |
| 461 | pnum, vol_id, lnum, ec, sqnum, bitflips); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 462 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 463 | av = add_volume(ai, vol_id, pnum, vid_hdr); |
| 464 | if (IS_ERR(av)) |
| 465 | return PTR_ERR(av); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 466 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 467 | if (ai->max_sqnum < sqnum) |
| 468 | ai->max_sqnum = sqnum; |
Brijesh Singh | 76eafe4 | 2007-07-06 14:35:43 +0300 | [diff] [blame] | 469 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 470 | /* |
| 471 | * Walk the RB-tree of logical eraseblocks of volume @vol_id to look |
| 472 | * if this is the first instance of this logical eraseblock or not. |
| 473 | */ |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 474 | p = &av->root.rb_node; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 475 | while (*p) { |
| 476 | int cmp_res; |
| 477 | |
| 478 | parent = *p; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 479 | aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); |
| 480 | if (lnum != aeb->lnum) { |
| 481 | if (lnum < aeb->lnum) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 482 | p = &(*p)->rb_left; |
| 483 | else |
| 484 | p = &(*p)->rb_right; |
| 485 | continue; |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * There is already a physical eraseblock describing the same |
| 490 | * logical eraseblock present. |
| 491 | */ |
| 492 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 493 | dbg_bld("this LEB already exists: PEB %d, sqnum %llu, EC %d", |
| 494 | aeb->pnum, aeb->sqnum, aeb->ec); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 495 | |
| 496 | /* |
| 497 | * Make sure that the logical eraseblocks have different |
| 498 | * sequence numbers. Otherwise the image is bad. |
| 499 | * |
Artem Bityutskiy | 9869cd8 | 2008-07-18 13:53:39 +0300 | [diff] [blame] | 500 | * However, if the sequence number is zero, we assume it must |
| 501 | * be an ancient UBI image from the era when UBI did not have |
| 502 | * sequence numbers. We still can attach these images, unless |
| 503 | * there is a need to distinguish between old and new |
| 504 | * eraseblocks, in which case we'll refuse the image in |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 505 | * 'ubi_compare_lebs()'. In other words, we attach old clean |
Artem Bityutskiy | 9869cd8 | 2008-07-18 13:53:39 +0300 | [diff] [blame] | 506 | * images, but refuse attaching old images with duplicated |
| 507 | * logical eraseblocks because there was an unclean reboot. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 508 | */ |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 509 | if (aeb->sqnum == sqnum && sqnum != 0) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 510 | ubi_err("two LEBs with same sequence number %llu", |
| 511 | sqnum); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 512 | ubi_dump_aeb(aeb, 0); |
Artem Bityutskiy | a904e3f | 2012-04-25 09:02:44 +0300 | [diff] [blame] | 513 | ubi_dump_vid_hdr(vid_hdr); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 514 | return -EINVAL; |
| 515 | } |
| 516 | |
| 517 | /* |
| 518 | * Now we have to drop the older one and preserve the newer |
| 519 | * one. |
| 520 | */ |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 521 | cmp_res = ubi_compare_lebs(ubi, aeb, pnum, vid_hdr); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 522 | if (cmp_res < 0) |
| 523 | return cmp_res; |
| 524 | |
| 525 | if (cmp_res & 1) { |
| 526 | /* |
Shinya Kuribayashi | 3f50262 | 2010-05-06 19:21:47 +0900 | [diff] [blame] | 527 | * This logical eraseblock is newer than the one |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 528 | * found earlier. |
| 529 | */ |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 530 | err = validate_vid_hdr(vid_hdr, av, pnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 531 | if (err) |
| 532 | return err; |
| 533 | |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 534 | err = add_to_list(ai, aeb->pnum, aeb->vol_id, |
| 535 | aeb->lnum, aeb->ec, cmp_res & 4, |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 536 | &ai->erase); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 537 | if (err) |
| 538 | return err; |
| 539 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 540 | aeb->ec = ec; |
| 541 | aeb->pnum = pnum; |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 542 | aeb->vol_id = vol_id; |
| 543 | aeb->lnum = lnum; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 544 | aeb->scrub = ((cmp_res & 2) || bitflips); |
| 545 | aeb->copy_flag = vid_hdr->copy_flag; |
| 546 | aeb->sqnum = sqnum; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 547 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 548 | if (av->highest_lnum == lnum) |
| 549 | av->last_data_size = |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 550 | be32_to_cpu(vid_hdr->data_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 551 | |
| 552 | return 0; |
| 553 | } else { |
| 554 | /* |
Frederik Schwarzer | 025dfda | 2008-10-16 19:02:37 +0200 | [diff] [blame] | 555 | * This logical eraseblock is older than the one found |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 556 | * previously. |
| 557 | */ |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 558 | return add_to_list(ai, pnum, vol_id, lnum, ec, |
| 559 | cmp_res & 4, &ai->erase); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 560 | } |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * We've met this logical eraseblock for the first time, add it to the |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 565 | * attaching information. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 566 | */ |
| 567 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 568 | err = validate_vid_hdr(vid_hdr, av, pnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 569 | if (err) |
| 570 | return err; |
| 571 | |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 572 | aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 573 | if (!aeb) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 574 | return -ENOMEM; |
| 575 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 576 | aeb->ec = ec; |
| 577 | aeb->pnum = pnum; |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 578 | aeb->vol_id = vol_id; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 579 | aeb->lnum = lnum; |
| 580 | aeb->scrub = bitflips; |
| 581 | aeb->copy_flag = vid_hdr->copy_flag; |
| 582 | aeb->sqnum = sqnum; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 583 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 584 | if (av->highest_lnum <= lnum) { |
| 585 | av->highest_lnum = lnum; |
| 586 | av->last_data_size = be32_to_cpu(vid_hdr->data_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 587 | } |
| 588 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 589 | av->leb_count += 1; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 590 | rb_link_node(&aeb->u.rb, parent, p); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 591 | rb_insert_color(&aeb->u.rb, &av->root); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | /** |
Artem Bityutskiy | dcd85fd | 2012-05-17 15:33:20 +0300 | [diff] [blame] | 596 | * ubi_find_av - find volume in the attaching information. |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 597 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 598 | * @vol_id: the requested volume ID |
| 599 | * |
| 600 | * This function returns a pointer to the volume description or %NULL if there |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 601 | * are no data about this volume in the attaching information. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 602 | */ |
Artem Bityutskiy | dcd85fd | 2012-05-17 15:33:20 +0300 | [diff] [blame] | 603 | struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai, |
| 604 | int vol_id) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 605 | { |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 606 | struct ubi_ainf_volume *av; |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 607 | struct rb_node *p = ai->volumes.rb_node; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 608 | |
| 609 | while (p) { |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 610 | av = rb_entry(p, struct ubi_ainf_volume, rb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 611 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 612 | if (vol_id == av->vol_id) |
| 613 | return av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 614 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 615 | if (vol_id > av->vol_id) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 616 | p = p->rb_left; |
| 617 | else |
| 618 | p = p->rb_right; |
| 619 | } |
| 620 | |
| 621 | return NULL; |
| 622 | } |
| 623 | |
| 624 | /** |
Artem Bityutskiy | d717dc2 | 2012-05-17 15:36:39 +0300 | [diff] [blame] | 625 | * ubi_remove_av - delete attaching information about a volume. |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 626 | * @ai: attaching information |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 627 | * @av: the volume attaching information to delete |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 628 | */ |
Artem Bityutskiy | d717dc2 | 2012-05-17 15:36:39 +0300 | [diff] [blame] | 629 | void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 630 | { |
| 631 | struct rb_node *rb; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 632 | struct ubi_ainf_peb *aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 633 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 634 | dbg_bld("remove attaching information about volume %d", av->vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 635 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 636 | while ((rb = rb_first(&av->root))) { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 637 | aeb = rb_entry(rb, struct ubi_ainf_peb, u.rb); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 638 | rb_erase(&aeb->u.rb, &av->root); |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 639 | list_add_tail(&aeb->u.list, &ai->erase); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 640 | } |
| 641 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 642 | rb_erase(&av->rb, &ai->volumes); |
| 643 | kfree(av); |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 644 | ai->vols_found -= 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 645 | } |
| 646 | |
| 647 | /** |
Artem Bityutskiy | 13d33da | 2012-05-17 15:20:28 +0300 | [diff] [blame] | 648 | * early_erase_peb - erase a physical eraseblock. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 649 | * @ubi: UBI device description object |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 650 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 651 | * @pnum: physical eraseblock number to erase; |
Artem Bityutskiy | 9c47fb2 | 2012-05-18 12:54:58 +0300 | [diff] [blame] | 652 | * @ec: erase counter value to write (%UBI_UNKNOWN if it is unknown) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 653 | * |
| 654 | * This function erases physical eraseblock 'pnum', and writes the erase |
| 655 | * counter header to it. This function should only be used on UBI device |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 656 | * initialization stages, when the EBA sub-system had not been yet initialized. |
| 657 | * This function returns zero in case of success and a negative error code in |
| 658 | * case of failure. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 659 | */ |
Artem Bityutskiy | 13d33da | 2012-05-17 15:20:28 +0300 | [diff] [blame] | 660 | static int early_erase_peb(struct ubi_device *ubi, |
| 661 | const struct ubi_attach_info *ai, int pnum, int ec) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 662 | { |
| 663 | int err; |
| 664 | struct ubi_ec_hdr *ec_hdr; |
| 665 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 666 | if ((long long)ec >= UBI_MAX_ERASECOUNTER) { |
| 667 | /* |
| 668 | * Erase counter overflow. Upgrade UBI and use 64-bit |
| 669 | * erase counters internally. |
| 670 | */ |
| 671 | ubi_err("erase counter overflow at PEB %d, EC %d", pnum, ec); |
| 672 | return -EINVAL; |
| 673 | } |
| 674 | |
Florin Malita | dcec4c3 | 2007-07-19 15:22:41 -0400 | [diff] [blame] | 675 | ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); |
| 676 | if (!ec_hdr) |
| 677 | return -ENOMEM; |
| 678 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 679 | ec_hdr->ec = cpu_to_be64(ec); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 680 | |
| 681 | err = ubi_io_sync_erase(ubi, pnum, 0); |
| 682 | if (err < 0) |
| 683 | goto out_free; |
| 684 | |
| 685 | err = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr); |
| 686 | |
| 687 | out_free: |
| 688 | kfree(ec_hdr); |
| 689 | return err; |
| 690 | } |
| 691 | |
| 692 | /** |
Artem Bityutskiy | c87fbd7 | 2012-05-17 15:38:56 +0300 | [diff] [blame] | 693 | * ubi_early_get_peb - get a free physical eraseblock. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 694 | * @ubi: UBI device description object |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 695 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 696 | * |
| 697 | * This function returns a free physical eraseblock. It is supposed to be |
Artem Bityutskiy | 85c6e6e | 2008-07-16 10:25:56 +0300 | [diff] [blame] | 698 | * called on the UBI initialization stages when the wear-leveling sub-system is |
| 699 | * not initialized yet. This function picks a physical eraseblocks from one of |
| 700 | * the lists, writes the EC header if it is needed, and removes it from the |
| 701 | * list. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 702 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 703 | * This function returns a pointer to the "aeb" of the found free PEB in case |
| 704 | * of success and an error code in case of failure. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 705 | */ |
Artem Bityutskiy | c87fbd7 | 2012-05-17 15:38:56 +0300 | [diff] [blame] | 706 | struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi, |
| 707 | struct ubi_attach_info *ai) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 708 | { |
Artem Bityutskiy | 5fc01ab | 2010-09-03 23:08:15 +0300 | [diff] [blame] | 709 | int err = 0; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 710 | struct ubi_ainf_peb *aeb, *tmp_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 711 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 712 | if (!list_empty(&ai->free)) { |
| 713 | aeb = list_entry(ai->free.next, struct ubi_ainf_peb, u.list); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 714 | list_del(&aeb->u.list); |
| 715 | dbg_bld("return free PEB %d, EC %d", aeb->pnum, aeb->ec); |
| 716 | return aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 717 | } |
| 718 | |
Artem Bityutskiy | 5fc01ab | 2010-09-03 23:08:15 +0300 | [diff] [blame] | 719 | /* |
| 720 | * We try to erase the first physical eraseblock from the erase list |
| 721 | * and pick it if we succeed, or try to erase the next one if not. And |
| 722 | * so forth. We don't want to take care about bad eraseblocks here - |
| 723 | * they'll be handled later. |
| 724 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 725 | list_for_each_entry_safe(aeb, tmp_aeb, &ai->erase, u.list) { |
Artem Bityutskiy | 9c47fb2 | 2012-05-18 12:54:58 +0300 | [diff] [blame] | 726 | if (aeb->ec == UBI_UNKNOWN) |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 727 | aeb->ec = ai->mean_ec; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 728 | |
Artem Bityutskiy | 13d33da | 2012-05-17 15:20:28 +0300 | [diff] [blame] | 729 | err = early_erase_peb(ubi, ai, aeb->pnum, aeb->ec+1); |
Artem Bityutskiy | 5fc01ab | 2010-09-03 23:08:15 +0300 | [diff] [blame] | 730 | if (err) |
| 731 | continue; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 732 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 733 | aeb->ec += 1; |
| 734 | list_del(&aeb->u.list); |
| 735 | dbg_bld("return PEB %d, EC %d", aeb->pnum, aeb->ec); |
| 736 | return aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 737 | } |
| 738 | |
Artem Bityutskiy | 5fc01ab | 2010-09-03 23:08:15 +0300 | [diff] [blame] | 739 | ubi_err("no free eraseblocks"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 740 | return ERR_PTR(-ENOSPC); |
| 741 | } |
| 742 | |
| 743 | /** |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 744 | * check_corruption - check the data area of PEB. |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 745 | * @ubi: UBI device description object |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 746 | * @vid_hdr: the (corrupted) VID header of this PEB |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 747 | * @pnum: the physical eraseblock number to check |
| 748 | * |
| 749 | * This is a helper function which is used to distinguish between VID header |
| 750 | * corruptions caused by power cuts and other reasons. If the PEB contains only |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 751 | * 0xFF bytes in the data area, the VID header is most probably corrupted |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 752 | * because of a power cut (%0 is returned in this case). Otherwise, it was |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 753 | * probably corrupted for some other reasons (%1 is returned in this case). A |
| 754 | * negative error code is returned if a read error occurred. |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 755 | * |
| 756 | * If the corruption reason was a power cut, UBI can safely erase this PEB. |
| 757 | * Otherwise, it should preserve it to avoid possibly destroying important |
| 758 | * information. |
| 759 | */ |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 760 | static int check_corruption(struct ubi_device *ubi, struct ubi_vid_hdr *vid_hdr, |
| 761 | int pnum) |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 762 | { |
| 763 | int err; |
| 764 | |
| 765 | mutex_lock(&ubi->buf_mutex); |
Artem Bityutskiy | 0ca39d7 | 2012-03-08 15:29:37 +0200 | [diff] [blame] | 766 | memset(ubi->peb_buf, 0x00, ubi->leb_size); |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 767 | |
Artem Bityutskiy | 0ca39d7 | 2012-03-08 15:29:37 +0200 | [diff] [blame] | 768 | err = ubi_io_read(ubi, ubi->peb_buf, pnum, ubi->leb_start, |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 769 | ubi->leb_size); |
Brian Norris | d57f4054 | 2011-09-20 18:34:25 -0700 | [diff] [blame] | 770 | if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err)) { |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 771 | /* |
| 772 | * Bit-flips or integrity errors while reading the data area. |
| 773 | * It is difficult to say for sure what type of corruption is |
| 774 | * this, but presumably a power cut happened while this PEB was |
| 775 | * erased, so it became unstable and corrupted, and should be |
| 776 | * erased. |
| 777 | */ |
Dan Carpenter | 1b1d76e | 2010-11-18 06:58:04 +0300 | [diff] [blame] | 778 | err = 0; |
| 779 | goto out_unlock; |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 780 | } |
| 781 | |
| 782 | if (err) |
Dan Carpenter | 1b1d76e | 2010-11-18 06:58:04 +0300 | [diff] [blame] | 783 | goto out_unlock; |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 784 | |
Artem Bityutskiy | 0ca39d7 | 2012-03-08 15:29:37 +0200 | [diff] [blame] | 785 | if (ubi_check_pattern(ubi->peb_buf, 0xFF, ubi->leb_size)) |
Dan Carpenter | 1b1d76e | 2010-11-18 06:58:04 +0300 | [diff] [blame] | 786 | goto out_unlock; |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 787 | |
Artem Bityutskiy | 049333c | 2012-08-27 14:43:54 +0300 | [diff] [blame] | 788 | ubi_err("PEB %d contains corrupted VID header, and the data does not contain all 0xFF", |
| 789 | pnum); |
| 790 | ubi_err("this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection"); |
Artem Bityutskiy | a904e3f | 2012-04-25 09:02:44 +0300 | [diff] [blame] | 791 | ubi_dump_vid_hdr(vid_hdr); |
Artem Bityutskiy | 719bb84 | 2012-08-27 17:14:58 +0300 | [diff] [blame] | 792 | pr_err("hexdump of PEB %d offset %d, length %d", |
| 793 | pnum, ubi->leb_start, ubi->leb_size); |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 794 | ubi_dbg_print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
Artem Bityutskiy | 0ca39d7 | 2012-03-08 15:29:37 +0200 | [diff] [blame] | 795 | ubi->peb_buf, ubi->leb_size, 1); |
Dan Carpenter | 1b1d76e | 2010-11-18 06:58:04 +0300 | [diff] [blame] | 796 | err = 1; |
| 797 | |
| 798 | out_unlock: |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 799 | mutex_unlock(&ubi->buf_mutex); |
Dan Carpenter | 1b1d76e | 2010-11-18 06:58:04 +0300 | [diff] [blame] | 800 | return err; |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 801 | } |
| 802 | |
| 803 | /** |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 804 | * scan_peb - scan and process UBI headers of a PEB. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 805 | * @ubi: UBI device description object |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 806 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 807 | * @pnum: the physical eraseblock number |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 808 | * @vid: The volume ID of the found volume will be stored in this pointer |
| 809 | * @sqnum: The sqnum of the found volume will be stored in this pointer |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 810 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 811 | * This function reads UBI headers of PEB @pnum, checks them, and adds |
| 812 | * information about this PEB to the corresponding list or RB-tree in the |
| 813 | * "attaching info" structure. Returns zero if the physical eraseblock was |
| 814 | * successfully handled and a negative error code in case of failure. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 815 | */ |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 816 | static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai, |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 817 | int pnum, int *vid, unsigned long long *sqnum) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 818 | { |
Artem Bityutskiy | c18a841 | 2008-01-24 11:19:14 +0200 | [diff] [blame] | 819 | long long uninitialized_var(ec); |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 820 | int err, bitflips = 0, vol_id = -1, ec_err = 0; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 821 | |
| 822 | dbg_bld("scan PEB %d", pnum); |
| 823 | |
| 824 | /* Skip bad physical eraseblocks */ |
| 825 | err = ubi_io_is_bad(ubi, pnum); |
| 826 | if (err < 0) |
| 827 | return err; |
| 828 | else if (err) { |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 829 | ai->bad_peb_count += 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 830 | return 0; |
| 831 | } |
| 832 | |
| 833 | err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); |
| 834 | if (err < 0) |
| 835 | return err; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 836 | switch (err) { |
| 837 | case 0: |
| 838 | break; |
| 839 | case UBI_IO_BITFLIPS: |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 840 | bitflips = 1; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 841 | break; |
| 842 | case UBI_IO_FF: |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 843 | ai->empty_peb_count += 1; |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 844 | return add_to_list(ai, pnum, UBI_UNKNOWN, UBI_UNKNOWN, |
| 845 | UBI_UNKNOWN, 0, &ai->erase); |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 846 | case UBI_IO_FF_BITFLIPS: |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 847 | ai->empty_peb_count += 1; |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 848 | return add_to_list(ai, pnum, UBI_UNKNOWN, UBI_UNKNOWN, |
| 849 | UBI_UNKNOWN, 1, &ai->erase); |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 850 | case UBI_IO_BAD_HDR_EBADMSG: |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 851 | case UBI_IO_BAD_HDR: |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 852 | /* |
| 853 | * We have to also look at the VID header, possibly it is not |
| 854 | * corrupted. Set %bitflips flag in order to make this PEB be |
| 855 | * moved and EC be re-created. |
| 856 | */ |
Artem Bityutskiy | e0e718c | 2010-09-03 14:53:23 +0300 | [diff] [blame] | 857 | ec_err = err; |
Artem Bityutskiy | 9c47fb2 | 2012-05-18 12:54:58 +0300 | [diff] [blame] | 858 | ec = UBI_UNKNOWN; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 859 | bitflips = 1; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 860 | break; |
| 861 | default: |
| 862 | ubi_err("'ubi_io_read_ec_hdr()' returned unknown code %d", err); |
| 863 | return -EINVAL; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 864 | } |
| 865 | |
Artem Bityutskiy | e0e718c | 2010-09-03 14:53:23 +0300 | [diff] [blame] | 866 | if (!ec_err) { |
Artem Bityutskiy | fe96efc | 2009-06-30 16:11:59 +0300 | [diff] [blame] | 867 | int image_seq; |
| 868 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 869 | /* Make sure UBI version is OK */ |
| 870 | if (ech->version != UBI_VERSION) { |
| 871 | ubi_err("this UBI version is %d, image version is %d", |
| 872 | UBI_VERSION, (int)ech->version); |
| 873 | return -EINVAL; |
| 874 | } |
| 875 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 876 | ec = be64_to_cpu(ech->ec); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 877 | if (ec > UBI_MAX_ERASECOUNTER) { |
| 878 | /* |
| 879 | * Erase counter overflow. The EC headers have 64 bits |
| 880 | * reserved, but we anyway make use of only 31 bit |
| 881 | * values, as this seems to be enough for any existing |
| 882 | * flash. Upgrade UBI and use 64-bit erase counters |
| 883 | * internally. |
| 884 | */ |
| 885 | ubi_err("erase counter overflow, max is %d", |
| 886 | UBI_MAX_ERASECOUNTER); |
Artem Bityutskiy | a904e3f | 2012-04-25 09:02:44 +0300 | [diff] [blame] | 887 | ubi_dump_ec_hdr(ech); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 888 | return -EINVAL; |
| 889 | } |
Artem Bityutskiy | fe96efc | 2009-06-30 16:11:59 +0300 | [diff] [blame] | 890 | |
Adrian Hunter | 32bc482 | 2009-07-24 19:16:04 +0300 | [diff] [blame] | 891 | /* |
| 892 | * Make sure that all PEBs have the same image sequence number. |
| 893 | * This allows us to detect situations when users flash UBI |
| 894 | * images incorrectly, so that the flash has the new UBI image |
| 895 | * and leftovers from the old one. This feature was added |
| 896 | * relatively recently, and the sequence number was always |
| 897 | * zero, because old UBI implementations always set it to zero. |
| 898 | * For this reasons, we do not panic if some PEBs have zero |
| 899 | * sequence number, while other PEBs have non-zero sequence |
| 900 | * number. |
| 901 | */ |
Holger Brunck | 3dc948d | 2009-07-13 16:47:57 +0200 | [diff] [blame] | 902 | image_seq = be32_to_cpu(ech->image_seq); |
Richard Genoud | 55b80c4 | 2013-09-28 15:55:14 +0200 | [diff] [blame] | 903 | if (!ubi->image_seq) |
Artem Bityutskiy | fe96efc | 2009-06-30 16:11:59 +0300 | [diff] [blame] | 904 | ubi->image_seq = image_seq; |
Richard Genoud | 55b80c4 | 2013-09-28 15:55:14 +0200 | [diff] [blame] | 905 | if (image_seq && ubi->image_seq != image_seq) { |
Artem Bityutskiy | 049333c | 2012-08-27 14:43:54 +0300 | [diff] [blame] | 906 | ubi_err("bad image sequence number %d in PEB %d, expected %d", |
| 907 | image_seq, pnum, ubi->image_seq); |
Artem Bityutskiy | a904e3f | 2012-04-25 09:02:44 +0300 | [diff] [blame] | 908 | ubi_dump_ec_hdr(ech); |
Artem Bityutskiy | fe96efc | 2009-06-30 16:11:59 +0300 | [diff] [blame] | 909 | return -EINVAL; |
| 910 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | /* OK, we've done with the EC header, let's look at the VID header */ |
| 914 | |
| 915 | err = ubi_io_read_vid_hdr(ubi, pnum, vidh, 0); |
| 916 | if (err < 0) |
| 917 | return err; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 918 | switch (err) { |
| 919 | case 0: |
| 920 | break; |
| 921 | case UBI_IO_BITFLIPS: |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 922 | bitflips = 1; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 923 | break; |
| 924 | case UBI_IO_BAD_HDR_EBADMSG: |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 925 | if (ec_err == UBI_IO_BAD_HDR_EBADMSG) |
| 926 | /* |
| 927 | * Both EC and VID headers are corrupted and were read |
| 928 | * with data integrity error, probably this is a bad |
| 929 | * PEB, bit it is not marked as bad yet. This may also |
| 930 | * be a result of power cut during erasure. |
| 931 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 932 | ai->maybe_bad_peb_count += 1; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 933 | case UBI_IO_BAD_HDR: |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 934 | if (ec_err) |
| 935 | /* |
| 936 | * Both headers are corrupted. There is a possibility |
| 937 | * that this a valid UBI PEB which has corresponding |
| 938 | * LEB, but the headers are corrupted. However, it is |
| 939 | * impossible to distinguish it from a PEB which just |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 940 | * contains garbage because of a power cut during erase |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 941 | * operation. So we just schedule this PEB for erasure. |
Artem Bityutskiy | 7ac760c | 2010-12-02 06:34:01 +0200 | [diff] [blame] | 942 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 943 | * Besides, in case of NOR flash, we deliberately |
Artem Bityutskiy | 7ac760c | 2010-12-02 06:34:01 +0200 | [diff] [blame] | 944 | * corrupt both headers because NOR flash erasure is |
| 945 | * slow and can start from the end. |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 946 | */ |
| 947 | err = 0; |
| 948 | else |
| 949 | /* |
| 950 | * The EC was OK, but the VID header is corrupted. We |
| 951 | * have to check what is in the data area. |
| 952 | */ |
Artem Bityutskiy | 45aafd3 | 2010-10-20 11:54:58 +0300 | [diff] [blame] | 953 | err = check_corruption(ubi, vidh, pnum); |
Artem Bityutskiy | df3fca4 | 2010-10-20 11:51:21 +0300 | [diff] [blame] | 954 | |
| 955 | if (err < 0) |
| 956 | return err; |
| 957 | else if (!err) |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 958 | /* This corruption is caused by a power cut */ |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 959 | err = add_to_list(ai, pnum, UBI_UNKNOWN, |
| 960 | UBI_UNKNOWN, ec, 1, &ai->erase); |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 961 | else |
| 962 | /* This is an unexpected corruption */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 963 | err = add_corrupted(ai, pnum, ec); |
Artem Bityutskiy | feeba4b | 2010-09-03 22:50:53 +0300 | [diff] [blame] | 964 | if (err) |
| 965 | return err; |
| 966 | goto adjust_mean_ec; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 967 | case UBI_IO_FF_BITFLIPS: |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 968 | err = add_to_list(ai, pnum, UBI_UNKNOWN, UBI_UNKNOWN, |
| 969 | ec, 1, &ai->erase); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 970 | if (err) |
| 971 | return err; |
| 972 | goto adjust_mean_ec; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 973 | case UBI_IO_FF: |
Matthieu CASTET | 193819c | 2012-08-22 16:03:46 +0200 | [diff] [blame] | 974 | if (ec_err || bitflips) |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 975 | err = add_to_list(ai, pnum, UBI_UNKNOWN, |
| 976 | UBI_UNKNOWN, ec, 1, &ai->erase); |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 977 | else |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 978 | err = add_to_list(ai, pnum, UBI_UNKNOWN, |
| 979 | UBI_UNKNOWN, ec, 0, &ai->free); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 980 | if (err) |
| 981 | return err; |
| 982 | goto adjust_mean_ec; |
Artem Bityutskiy | b332150 | 2010-09-03 14:40:55 +0300 | [diff] [blame] | 983 | default: |
| 984 | ubi_err("'ubi_io_read_vid_hdr()' returned unknown code %d", |
| 985 | err); |
| 986 | return -EINVAL; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 987 | } |
| 988 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 989 | vol_id = be32_to_cpu(vidh->vol_id); |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 990 | if (vid) |
| 991 | *vid = vol_id; |
| 992 | if (sqnum) |
| 993 | *sqnum = be64_to_cpu(vidh->sqnum); |
Artem Bityutskiy | 91f2d53 | 2008-01-24 11:23:23 +0200 | [diff] [blame] | 994 | if (vol_id > UBI_MAX_VOLUMES && vol_id != UBI_LAYOUT_VOLUME_ID) { |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 995 | int lnum = be32_to_cpu(vidh->lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 996 | |
| 997 | /* Unsupported internal volume */ |
| 998 | switch (vidh->compat) { |
| 999 | case UBI_COMPAT_DELETE: |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1000 | if (vol_id != UBI_FM_SB_VOLUME_ID |
| 1001 | && vol_id != UBI_FM_DATA_VOLUME_ID) { |
| 1002 | ubi_msg("\"delete\" compatible internal volume %d:%d found, will remove it", |
| 1003 | vol_id, lnum); |
| 1004 | } |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 1005 | err = add_to_list(ai, pnum, vol_id, lnum, |
| 1006 | ec, 1, &ai->erase); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1007 | if (err) |
| 1008 | return err; |
Brijesh Singh | 158132c | 2010-06-16 09:28:26 +0300 | [diff] [blame] | 1009 | return 0; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1010 | |
| 1011 | case UBI_COMPAT_RO: |
Artem Bityutskiy | 049333c | 2012-08-27 14:43:54 +0300 | [diff] [blame] | 1012 | ubi_msg("read-only compatible internal volume %d:%d found, switch to read-only mode", |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1013 | vol_id, lnum); |
| 1014 | ubi->ro_mode = 1; |
| 1015 | break; |
| 1016 | |
| 1017 | case UBI_COMPAT_PRESERVE: |
Artem Bityutskiy | 049333c | 2012-08-27 14:43:54 +0300 | [diff] [blame] | 1018 | ubi_msg("\"preserve\" compatible internal volume %d:%d found", |
| 1019 | vol_id, lnum); |
Joel Reardon | 6dd3bc7 | 2012-05-16 14:20:56 +0200 | [diff] [blame] | 1020 | err = add_to_list(ai, pnum, vol_id, lnum, |
| 1021 | ec, 0, &ai->alien); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1022 | if (err) |
| 1023 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1024 | return 0; |
| 1025 | |
| 1026 | case UBI_COMPAT_REJECT: |
| 1027 | ubi_err("incompatible internal volume %d:%d found", |
| 1028 | vol_id, lnum); |
| 1029 | return -EINVAL; |
| 1030 | } |
| 1031 | } |
| 1032 | |
Artem Bityutskiy | e0e718c | 2010-09-03 14:53:23 +0300 | [diff] [blame] | 1033 | if (ec_err) |
Artem Bityutskiy | 29a88c9 | 2009-07-19 14:03:16 +0300 | [diff] [blame] | 1034 | ubi_warn("valid VID header but corrupted EC header at PEB %d", |
| 1035 | pnum); |
Artem Bityutskiy | 3561188 | 2012-05-17 15:31:31 +0300 | [diff] [blame] | 1036 | err = ubi_add_to_av(ubi, ai, pnum, ec, vidh, bitflips); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1037 | if (err) |
| 1038 | return err; |
| 1039 | |
| 1040 | adjust_mean_ec: |
Artem Bityutskiy | e0e718c | 2010-09-03 14:53:23 +0300 | [diff] [blame] | 1041 | if (!ec_err) { |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1042 | ai->ec_sum += ec; |
| 1043 | ai->ec_count += 1; |
| 1044 | if (ec > ai->max_ec) |
| 1045 | ai->max_ec = ec; |
| 1046 | if (ec < ai->min_ec) |
| 1047 | ai->min_ec = ec; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1048 | } |
| 1049 | |
| 1050 | return 0; |
| 1051 | } |
| 1052 | |
| 1053 | /** |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 1054 | * late_analysis - analyze the overall situation with PEB. |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1055 | * @ubi: UBI device description object |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1056 | * @ai: attaching information |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1057 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 1058 | * This is a helper function which takes a look what PEBs we have after we |
| 1059 | * gather information about all of them ("ai" is compete). It decides whether |
| 1060 | * the flash is empty and should be formatted of whether there are too many |
| 1061 | * corrupted PEBs and we should not attach this MTD device. Returns zero if we |
| 1062 | * should proceed with attaching the MTD device, and %-EINVAL if we should not. |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1063 | */ |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 1064 | static int late_analysis(struct ubi_device *ubi, struct ubi_attach_info *ai) |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1065 | { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1066 | struct ubi_ainf_peb *aeb; |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 1067 | int max_corr, peb_count; |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1068 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1069 | peb_count = ubi->peb_count - ai->bad_peb_count - ai->alien_peb_count; |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 1070 | max_corr = peb_count / 20 ?: 8; |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1071 | |
| 1072 | /* |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 1073 | * Few corrupted PEBs is not a problem and may be just a result of |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1074 | * unclean reboots. However, many of them may indicate some problems |
| 1075 | * with the flash HW or driver. |
| 1076 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1077 | if (ai->corr_peb_count) { |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 1078 | ubi_err("%d PEBs are corrupted and preserved", |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1079 | ai->corr_peb_count); |
Artem Bityutskiy | e28453b | 2012-08-27 15:13:05 +0300 | [diff] [blame] | 1080 | pr_err("Corrupted PEBs are:"); |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1081 | list_for_each_entry(aeb, &ai->corr, u.list) |
Artem Bityutskiy | e28453b | 2012-08-27 15:13:05 +0300 | [diff] [blame] | 1082 | pr_cont(" %d", aeb->pnum); |
| 1083 | pr_cont("\n"); |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1084 | |
| 1085 | /* |
| 1086 | * If too many PEBs are corrupted, we refuse attaching, |
| 1087 | * otherwise, only print a warning. |
| 1088 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1089 | if (ai->corr_peb_count >= max_corr) { |
Artem Bityutskiy | feddbb3 | 2011-03-28 10:12:25 +0300 | [diff] [blame] | 1090 | ubi_err("too many corrupted PEBs, refusing"); |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1091 | return -EINVAL; |
| 1092 | } |
| 1093 | } |
| 1094 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1095 | if (ai->empty_peb_count + ai->maybe_bad_peb_count == peb_count) { |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 1096 | /* |
| 1097 | * All PEBs are empty, or almost all - a couple PEBs look like |
| 1098 | * they may be bad PEBs which were not marked as bad yet. |
| 1099 | * |
| 1100 | * This piece of code basically tries to distinguish between |
| 1101 | * the following situations: |
| 1102 | * |
| 1103 | * 1. Flash is empty, but there are few bad PEBs, which are not |
| 1104 | * marked as bad so far, and which were read with error. We |
| 1105 | * want to go ahead and format this flash. While formatting, |
| 1106 | * the faulty PEBs will probably be marked as bad. |
| 1107 | * |
| 1108 | * 2. Flash contains non-UBI data and we do not want to format |
| 1109 | * it and destroy possibly important information. |
| 1110 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1111 | if (ai->maybe_bad_peb_count <= 2) { |
| 1112 | ai->is_empty = 1; |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1113 | ubi_msg("empty MTD device detected"); |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 1114 | get_random_bytes(&ubi->image_seq, |
| 1115 | sizeof(ubi->image_seq)); |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1116 | } else { |
Artem Bityutskiy | 049333c | 2012-08-27 14:43:54 +0300 | [diff] [blame] | 1117 | ubi_err("MTD device is not UBI-formatted and possibly contains non-UBI data - refusing it"); |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1118 | return -EINVAL; |
| 1119 | } |
Artem Bityutskiy | 0525dac | 2010-09-03 17:11:37 +0300 | [diff] [blame] | 1120 | |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1121 | } |
| 1122 | |
Artem Bityutskiy | 0798cea | 2010-04-30 13:02:33 +0300 | [diff] [blame] | 1123 | return 0; |
| 1124 | } |
| 1125 | |
| 1126 | /** |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 1127 | * destroy_av - free volume attaching information. |
| 1128 | * @av: volume attaching information |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1129 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1130 | * |
Artem Bityutskiy | fbd0107 | 2012-05-17 16:12:26 +0300 | [diff] [blame] | 1131 | * This function destroys the volume attaching information. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1132 | */ |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1133 | static void destroy_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1134 | { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1135 | struct ubi_ainf_peb *aeb; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1136 | struct rb_node *this = av->root.rb_node; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1137 | |
| 1138 | while (this) { |
| 1139 | if (this->rb_left) |
| 1140 | this = this->rb_left; |
| 1141 | else if (this->rb_right) |
| 1142 | this = this->rb_right; |
| 1143 | else { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1144 | aeb = rb_entry(this, struct ubi_ainf_peb, u.rb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1145 | this = rb_parent(this); |
| 1146 | if (this) { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1147 | if (this->rb_left == &aeb->u.rb) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1148 | this->rb_left = NULL; |
| 1149 | else |
| 1150 | this->rb_right = NULL; |
| 1151 | } |
| 1152 | |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 1153 | kmem_cache_free(ai->aeb_slab_cache, aeb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1154 | } |
| 1155 | } |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1156 | kfree(av); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1157 | } |
| 1158 | |
| 1159 | /** |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1160 | * destroy_ai - destroy attaching information. |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1161 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1162 | */ |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1163 | static void destroy_ai(struct ubi_attach_info *ai) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1164 | { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1165 | struct ubi_ainf_peb *aeb, *aeb_tmp; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1166 | struct ubi_ainf_volume *av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1167 | struct rb_node *rb; |
| 1168 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1169 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->alien, u.list) { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1170 | list_del(&aeb->u.list); |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 1171 | kmem_cache_free(ai->aeb_slab_cache, aeb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1172 | } |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1173 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->erase, u.list) { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1174 | list_del(&aeb->u.list); |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 1175 | kmem_cache_free(ai->aeb_slab_cache, aeb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1176 | } |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1177 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->corr, u.list) { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1178 | list_del(&aeb->u.list); |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 1179 | kmem_cache_free(ai->aeb_slab_cache, aeb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1180 | } |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1181 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->free, u.list) { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1182 | list_del(&aeb->u.list); |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 1183 | kmem_cache_free(ai->aeb_slab_cache, aeb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1184 | } |
| 1185 | |
| 1186 | /* Destroy the volume RB-tree */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1187 | rb = ai->volumes.rb_node; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1188 | while (rb) { |
| 1189 | if (rb->rb_left) |
| 1190 | rb = rb->rb_left; |
| 1191 | else if (rb->rb_right) |
| 1192 | rb = rb->rb_right; |
| 1193 | else { |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1194 | av = rb_entry(rb, struct ubi_ainf_volume, rb); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1195 | |
| 1196 | rb = rb_parent(rb); |
| 1197 | if (rb) { |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1198 | if (rb->rb_left == &av->rb) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1199 | rb->rb_left = NULL; |
| 1200 | else |
| 1201 | rb->rb_right = NULL; |
| 1202 | } |
| 1203 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1204 | destroy_av(ai, av); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1205 | } |
| 1206 | } |
| 1207 | |
Artem Bityutskiy | 1fc2e3e | 2012-05-17 15:56:03 +0300 | [diff] [blame] | 1208 | if (ai->aeb_slab_cache) |
| 1209 | kmem_cache_destroy(ai->aeb_slab_cache); |
Richard Weinberger | a29852b | 2012-01-30 18:20:13 +0100 | [diff] [blame] | 1210 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1211 | kfree(ai); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1212 | } |
| 1213 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1214 | /** |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1215 | * scan_all - scan entire MTD device. |
| 1216 | * @ubi: UBI device description object |
| 1217 | * @ai: attach info object |
| 1218 | * @start: start scanning at this PEB |
| 1219 | * |
| 1220 | * This function does full scanning of an MTD device and returns complete |
| 1221 | * information about it in form of a "struct ubi_attach_info" object. In case |
| 1222 | * of failure, an error code is returned. |
| 1223 | */ |
| 1224 | static int scan_all(struct ubi_device *ubi, struct ubi_attach_info *ai, |
| 1225 | int start) |
| 1226 | { |
| 1227 | int err, pnum; |
| 1228 | struct rb_node *rb1, *rb2; |
| 1229 | struct ubi_ainf_volume *av; |
| 1230 | struct ubi_ainf_peb *aeb; |
| 1231 | |
| 1232 | err = -ENOMEM; |
| 1233 | |
| 1234 | ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); |
| 1235 | if (!ech) |
| 1236 | return err; |
| 1237 | |
| 1238 | vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); |
| 1239 | if (!vidh) |
| 1240 | goto out_ech; |
| 1241 | |
| 1242 | for (pnum = start; pnum < ubi->peb_count; pnum++) { |
| 1243 | cond_resched(); |
| 1244 | |
| 1245 | dbg_gen("process PEB %d", pnum); |
| 1246 | err = scan_peb(ubi, ai, pnum, NULL, NULL); |
| 1247 | if (err < 0) |
| 1248 | goto out_vidh; |
| 1249 | } |
| 1250 | |
| 1251 | ubi_msg("scanning is finished"); |
| 1252 | |
| 1253 | /* Calculate mean erase counter */ |
| 1254 | if (ai->ec_count) |
| 1255 | ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count); |
| 1256 | |
| 1257 | err = late_analysis(ubi, ai); |
| 1258 | if (err) |
| 1259 | goto out_vidh; |
| 1260 | |
| 1261 | /* |
| 1262 | * In case of unknown erase counter we use the mean erase counter |
| 1263 | * value. |
| 1264 | */ |
| 1265 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) { |
| 1266 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) |
| 1267 | if (aeb->ec == UBI_UNKNOWN) |
| 1268 | aeb->ec = ai->mean_ec; |
| 1269 | } |
| 1270 | |
| 1271 | list_for_each_entry(aeb, &ai->free, u.list) { |
| 1272 | if (aeb->ec == UBI_UNKNOWN) |
| 1273 | aeb->ec = ai->mean_ec; |
| 1274 | } |
| 1275 | |
| 1276 | list_for_each_entry(aeb, &ai->corr, u.list) |
| 1277 | if (aeb->ec == UBI_UNKNOWN) |
| 1278 | aeb->ec = ai->mean_ec; |
| 1279 | |
| 1280 | list_for_each_entry(aeb, &ai->erase, u.list) |
| 1281 | if (aeb->ec == UBI_UNKNOWN) |
| 1282 | aeb->ec = ai->mean_ec; |
| 1283 | |
| 1284 | err = self_check_ai(ubi, ai); |
| 1285 | if (err) |
| 1286 | goto out_vidh; |
| 1287 | |
| 1288 | ubi_free_vid_hdr(ubi, vidh); |
| 1289 | kfree(ech); |
| 1290 | |
| 1291 | return 0; |
| 1292 | |
| 1293 | out_vidh: |
| 1294 | ubi_free_vid_hdr(ubi, vidh); |
| 1295 | out_ech: |
| 1296 | kfree(ech); |
| 1297 | return err; |
| 1298 | } |
| 1299 | |
| 1300 | #ifdef CONFIG_MTD_UBI_FASTMAP |
| 1301 | |
| 1302 | /** |
| 1303 | * scan_fastmap - try to find a fastmap and attach from it. |
| 1304 | * @ubi: UBI device description object |
| 1305 | * @ai: attach info object |
| 1306 | * |
| 1307 | * Returns 0 on success, negative return values indicate an internal |
| 1308 | * error. |
| 1309 | * UBI_NO_FASTMAP denotes that no fastmap was found. |
| 1310 | * UBI_BAD_FASTMAP denotes that the found fastmap was invalid. |
| 1311 | */ |
| 1312 | static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai) |
| 1313 | { |
| 1314 | int err, pnum, fm_anchor = -1; |
| 1315 | unsigned long long max_sqnum = 0; |
| 1316 | |
| 1317 | err = -ENOMEM; |
| 1318 | |
| 1319 | ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); |
| 1320 | if (!ech) |
| 1321 | goto out; |
| 1322 | |
| 1323 | vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); |
| 1324 | if (!vidh) |
| 1325 | goto out_ech; |
| 1326 | |
| 1327 | for (pnum = 0; pnum < UBI_FM_MAX_START; pnum++) { |
| 1328 | int vol_id = -1; |
| 1329 | unsigned long long sqnum = -1; |
| 1330 | cond_resched(); |
| 1331 | |
| 1332 | dbg_gen("process PEB %d", pnum); |
| 1333 | err = scan_peb(ubi, ai, pnum, &vol_id, &sqnum); |
| 1334 | if (err < 0) |
| 1335 | goto out_vidh; |
| 1336 | |
| 1337 | if (vol_id == UBI_FM_SB_VOLUME_ID && sqnum > max_sqnum) { |
| 1338 | max_sqnum = sqnum; |
| 1339 | fm_anchor = pnum; |
| 1340 | } |
| 1341 | } |
| 1342 | |
| 1343 | ubi_free_vid_hdr(ubi, vidh); |
| 1344 | kfree(ech); |
| 1345 | |
| 1346 | if (fm_anchor < 0) |
| 1347 | return UBI_NO_FASTMAP; |
| 1348 | |
| 1349 | return ubi_scan_fastmap(ubi, ai, fm_anchor); |
| 1350 | |
| 1351 | out_vidh: |
| 1352 | ubi_free_vid_hdr(ubi, vidh); |
| 1353 | out_ech: |
| 1354 | kfree(ech); |
| 1355 | out: |
| 1356 | return err; |
| 1357 | } |
| 1358 | |
| 1359 | #endif |
| 1360 | |
| 1361 | static struct ubi_attach_info *alloc_ai(const char *slab_name) |
| 1362 | { |
| 1363 | struct ubi_attach_info *ai; |
| 1364 | |
| 1365 | ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL); |
| 1366 | if (!ai) |
| 1367 | return ai; |
| 1368 | |
| 1369 | INIT_LIST_HEAD(&ai->corr); |
| 1370 | INIT_LIST_HEAD(&ai->free); |
| 1371 | INIT_LIST_HEAD(&ai->erase); |
| 1372 | INIT_LIST_HEAD(&ai->alien); |
| 1373 | ai->volumes = RB_ROOT; |
| 1374 | ai->aeb_slab_cache = kmem_cache_create(slab_name, |
| 1375 | sizeof(struct ubi_ainf_peb), |
| 1376 | 0, 0, NULL); |
| 1377 | if (!ai->aeb_slab_cache) { |
| 1378 | kfree(ai); |
| 1379 | ai = NULL; |
| 1380 | } |
| 1381 | |
| 1382 | return ai; |
| 1383 | } |
| 1384 | |
| 1385 | /** |
| 1386 | * ubi_attach - attach an MTD device. |
| 1387 | * @ubi: UBI device descriptor |
| 1388 | * @force_scan: if set to non-zero attach by scanning |
| 1389 | * |
| 1390 | * This function returns zero in case of success and a negative error code in |
| 1391 | * case of failure. |
| 1392 | */ |
| 1393 | int ubi_attach(struct ubi_device *ubi, int force_scan) |
| 1394 | { |
| 1395 | int err; |
| 1396 | struct ubi_attach_info *ai; |
| 1397 | |
| 1398 | ai = alloc_ai("ubi_aeb_slab_cache"); |
| 1399 | if (!ai) |
| 1400 | return -ENOMEM; |
| 1401 | |
| 1402 | #ifdef CONFIG_MTD_UBI_FASTMAP |
| 1403 | /* On small flash devices we disable fastmap in any case. */ |
| 1404 | if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) { |
| 1405 | ubi->fm_disabled = 1; |
| 1406 | force_scan = 1; |
| 1407 | } |
| 1408 | |
| 1409 | if (force_scan) |
| 1410 | err = scan_all(ubi, ai, 0); |
| 1411 | else { |
| 1412 | err = scan_fast(ubi, ai); |
| 1413 | if (err > 0) { |
| 1414 | if (err != UBI_NO_FASTMAP) { |
| 1415 | destroy_ai(ai); |
| 1416 | ai = alloc_ai("ubi_aeb_slab_cache2"); |
| 1417 | if (!ai) |
| 1418 | return -ENOMEM; |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1419 | |
Richard Weinberger | 4b3e0a2 | 2013-09-28 15:55:12 +0200 | [diff] [blame] | 1420 | err = scan_all(ubi, ai, 0); |
| 1421 | } else { |
| 1422 | err = scan_all(ubi, ai, UBI_FM_MAX_START); |
| 1423 | } |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1424 | } |
| 1425 | } |
| 1426 | #else |
| 1427 | err = scan_all(ubi, ai, 0); |
| 1428 | #endif |
| 1429 | if (err) |
| 1430 | goto out_ai; |
| 1431 | |
| 1432 | ubi->bad_peb_count = ai->bad_peb_count; |
| 1433 | ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count; |
| 1434 | ubi->corr_peb_count = ai->corr_peb_count; |
| 1435 | ubi->max_ec = ai->max_ec; |
| 1436 | ubi->mean_ec = ai->mean_ec; |
| 1437 | dbg_gen("max. sequence number: %llu", ai->max_sqnum); |
| 1438 | |
| 1439 | err = ubi_read_volume_table(ubi, ai); |
| 1440 | if (err) |
| 1441 | goto out_ai; |
| 1442 | |
| 1443 | err = ubi_wl_init(ubi, ai); |
| 1444 | if (err) |
| 1445 | goto out_vtbl; |
| 1446 | |
| 1447 | err = ubi_eba_init(ubi, ai); |
| 1448 | if (err) |
| 1449 | goto out_wl; |
| 1450 | |
| 1451 | #ifdef CONFIG_MTD_UBI_FASTMAP |
Ezequiel Garcia | 6457557 | 2012-11-28 09:18:29 -0300 | [diff] [blame] | 1452 | if (ubi->fm && ubi_dbg_chk_gen(ubi)) { |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1453 | struct ubi_attach_info *scan_ai; |
| 1454 | |
| 1455 | scan_ai = alloc_ai("ubi_ckh_aeb_slab_cache"); |
Julia Lawall | 4d52514 | 2013-12-29 23:47:19 +0100 | [diff] [blame] | 1456 | if (!scan_ai) { |
| 1457 | err = -ENOMEM; |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1458 | goto out_wl; |
Julia Lawall | 4d52514 | 2013-12-29 23:47:19 +0100 | [diff] [blame] | 1459 | } |
Richard Weinberger | dac6e20 | 2012-09-26 17:51:47 +0200 | [diff] [blame] | 1460 | |
| 1461 | err = scan_all(ubi, scan_ai, 0); |
| 1462 | if (err) { |
| 1463 | destroy_ai(scan_ai); |
| 1464 | goto out_wl; |
| 1465 | } |
| 1466 | |
| 1467 | err = self_check_eba(ubi, ai, scan_ai); |
| 1468 | destroy_ai(scan_ai); |
| 1469 | |
| 1470 | if (err) |
| 1471 | goto out_wl; |
| 1472 | } |
| 1473 | #endif |
| 1474 | |
| 1475 | destroy_ai(ai); |
| 1476 | return 0; |
| 1477 | |
| 1478 | out_wl: |
| 1479 | ubi_wl_close(ubi); |
| 1480 | out_vtbl: |
| 1481 | ubi_free_internal_volumes(ubi); |
| 1482 | vfree(ubi->vtbl); |
| 1483 | out_ai: |
| 1484 | destroy_ai(ai); |
| 1485 | return err; |
| 1486 | } |
| 1487 | |
| 1488 | /** |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1489 | * self_check_ai - check the attaching information. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1490 | * @ubi: UBI device description object |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1491 | * @ai: attaching information |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1492 | * |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1493 | * This function returns zero if the attaching information is all right, and a |
Artem Bityutskiy | adbf05e | 2010-01-20 10:28:58 +0200 | [diff] [blame] | 1494 | * negative error code if not or if an error occurred. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1495 | */ |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1496 | static int self_check_ai(struct ubi_device *ubi, struct ubi_attach_info *ai) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1497 | { |
| 1498 | int pnum, err, vols_found = 0; |
| 1499 | struct rb_node *rb1, *rb2; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1500 | struct ubi_ainf_volume *av; |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1501 | struct ubi_ainf_peb *aeb, *last_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1502 | uint8_t *buf; |
| 1503 | |
Ezequiel Garcia | 6457557 | 2012-11-28 09:18:29 -0300 | [diff] [blame] | 1504 | if (!ubi_dbg_chk_gen(ubi)) |
Artem Bityutskiy | 92d124f | 2011-03-14 18:17:40 +0200 | [diff] [blame] | 1505 | return 0; |
| 1506 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1507 | /* |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1508 | * At first, check that attaching information is OK. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1509 | */ |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1510 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1511 | int leb_count = 0; |
| 1512 | |
| 1513 | cond_resched(); |
| 1514 | |
| 1515 | vols_found += 1; |
| 1516 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1517 | if (ai->is_empty) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1518 | ubi_err("bad is_empty flag"); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1519 | goto bad_av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1520 | } |
| 1521 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1522 | if (av->vol_id < 0 || av->highest_lnum < 0 || |
| 1523 | av->leb_count < 0 || av->vol_type < 0 || av->used_ebs < 0 || |
| 1524 | av->data_pad < 0 || av->last_data_size < 0) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1525 | ubi_err("negative values"); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1526 | goto bad_av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1527 | } |
| 1528 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1529 | if (av->vol_id >= UBI_MAX_VOLUMES && |
| 1530 | av->vol_id < UBI_INTERNAL_VOL_START) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1531 | ubi_err("bad vol_id"); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1532 | goto bad_av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1533 | } |
| 1534 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1535 | if (av->vol_id > ai->highest_vol_id) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1536 | ubi_err("highest_vol_id is %d, but vol_id %d is there", |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1537 | ai->highest_vol_id, av->vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1538 | goto out; |
| 1539 | } |
| 1540 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1541 | if (av->vol_type != UBI_DYNAMIC_VOLUME && |
| 1542 | av->vol_type != UBI_STATIC_VOLUME) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1543 | ubi_err("bad vol_type"); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1544 | goto bad_av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1545 | } |
| 1546 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1547 | if (av->data_pad > ubi->leb_size / 2) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1548 | ubi_err("bad data_pad"); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1549 | goto bad_av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1550 | } |
| 1551 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1552 | last_aeb = NULL; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1553 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1554 | cond_resched(); |
| 1555 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1556 | last_aeb = aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1557 | leb_count += 1; |
| 1558 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1559 | if (aeb->pnum < 0 || aeb->ec < 0) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1560 | ubi_err("negative values"); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1561 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1562 | } |
| 1563 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1564 | if (aeb->ec < ai->min_ec) { |
| 1565 | ubi_err("bad ai->min_ec (%d), %d found", |
| 1566 | ai->min_ec, aeb->ec); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1567 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1568 | } |
| 1569 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1570 | if (aeb->ec > ai->max_ec) { |
| 1571 | ubi_err("bad ai->max_ec (%d), %d found", |
| 1572 | ai->max_ec, aeb->ec); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1573 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1574 | } |
| 1575 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1576 | if (aeb->pnum >= ubi->peb_count) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1577 | ubi_err("too high PEB number %d, total PEBs %d", |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1578 | aeb->pnum, ubi->peb_count); |
| 1579 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1580 | } |
| 1581 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1582 | if (av->vol_type == UBI_STATIC_VOLUME) { |
| 1583 | if (aeb->lnum >= av->used_ebs) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1584 | ubi_err("bad lnum or used_ebs"); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1585 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1586 | } |
| 1587 | } else { |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1588 | if (av->used_ebs != 0) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1589 | ubi_err("non-zero used_ebs"); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1590 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1591 | } |
| 1592 | } |
| 1593 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1594 | if (aeb->lnum > av->highest_lnum) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1595 | ubi_err("incorrect highest_lnum or lnum"); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1596 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1597 | } |
| 1598 | } |
| 1599 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1600 | if (av->leb_count != leb_count) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1601 | ubi_err("bad leb_count, %d objects in the tree", |
| 1602 | leb_count); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1603 | goto bad_av; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1604 | } |
| 1605 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1606 | if (!last_aeb) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1607 | continue; |
| 1608 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1609 | aeb = last_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1610 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1611 | if (aeb->lnum != av->highest_lnum) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1612 | ubi_err("bad highest_lnum"); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1613 | goto bad_aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1614 | } |
| 1615 | } |
| 1616 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1617 | if (vols_found != ai->vols_found) { |
| 1618 | ubi_err("bad ai->vols_found %d, should be %d", |
| 1619 | ai->vols_found, vols_found); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1620 | goto out; |
| 1621 | } |
| 1622 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1623 | /* Check that attaching information is correct */ |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1624 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) { |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1625 | last_aeb = NULL; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1626 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1627 | int vol_type; |
| 1628 | |
| 1629 | cond_resched(); |
| 1630 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1631 | last_aeb = aeb; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1632 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1633 | err = ubi_io_read_vid_hdr(ubi, aeb->pnum, vidh, 1); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1634 | if (err && err != UBI_IO_BITFLIPS) { |
| 1635 | ubi_err("VID header is not OK (%d)", err); |
| 1636 | if (err > 0) |
| 1637 | err = -EIO; |
| 1638 | return err; |
| 1639 | } |
| 1640 | |
| 1641 | vol_type = vidh->vol_type == UBI_VID_DYNAMIC ? |
| 1642 | UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME; |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1643 | if (av->vol_type != vol_type) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1644 | ubi_err("bad vol_type"); |
| 1645 | goto bad_vid_hdr; |
| 1646 | } |
| 1647 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1648 | if (aeb->sqnum != be64_to_cpu(vidh->sqnum)) { |
| 1649 | ubi_err("bad sqnum %llu", aeb->sqnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1650 | goto bad_vid_hdr; |
| 1651 | } |
| 1652 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1653 | if (av->vol_id != be32_to_cpu(vidh->vol_id)) { |
| 1654 | ubi_err("bad vol_id %d", av->vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1655 | goto bad_vid_hdr; |
| 1656 | } |
| 1657 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1658 | if (av->compat != vidh->compat) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1659 | ubi_err("bad compat %d", vidh->compat); |
| 1660 | goto bad_vid_hdr; |
| 1661 | } |
| 1662 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1663 | if (aeb->lnum != be32_to_cpu(vidh->lnum)) { |
| 1664 | ubi_err("bad lnum %d", aeb->lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1665 | goto bad_vid_hdr; |
| 1666 | } |
| 1667 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1668 | if (av->used_ebs != be32_to_cpu(vidh->used_ebs)) { |
| 1669 | ubi_err("bad used_ebs %d", av->used_ebs); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1670 | goto bad_vid_hdr; |
| 1671 | } |
| 1672 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1673 | if (av->data_pad != be32_to_cpu(vidh->data_pad)) { |
| 1674 | ubi_err("bad data_pad %d", av->data_pad); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1675 | goto bad_vid_hdr; |
| 1676 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1677 | } |
| 1678 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1679 | if (!last_aeb) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1680 | continue; |
| 1681 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1682 | if (av->highest_lnum != be32_to_cpu(vidh->lnum)) { |
| 1683 | ubi_err("bad highest_lnum %d", av->highest_lnum); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1684 | goto bad_vid_hdr; |
| 1685 | } |
| 1686 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1687 | if (av->last_data_size != be32_to_cpu(vidh->data_size)) { |
| 1688 | ubi_err("bad last_data_size %d", av->last_data_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1689 | goto bad_vid_hdr; |
| 1690 | } |
| 1691 | } |
| 1692 | |
| 1693 | /* |
| 1694 | * Make sure that all the physical eraseblocks are in one of the lists |
| 1695 | * or trees. |
| 1696 | */ |
Mariusz Kozlowski | d9b0744 | 2007-08-01 00:02:10 +0200 | [diff] [blame] | 1697 | buf = kzalloc(ubi->peb_count, GFP_KERNEL); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1698 | if (!buf) |
| 1699 | return -ENOMEM; |
| 1700 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1701 | for (pnum = 0; pnum < ubi->peb_count; pnum++) { |
| 1702 | err = ubi_io_is_bad(ubi, pnum); |
Artem Bityutskiy | 341e1a0 | 2007-05-03 11:59:51 +0300 | [diff] [blame] | 1703 | if (err < 0) { |
| 1704 | kfree(buf); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1705 | return err; |
Artem Bityutskiy | 9c9ec14 | 2008-07-18 13:19:52 +0300 | [diff] [blame] | 1706 | } else if (err) |
Mariusz Kozlowski | d9b0744 | 2007-08-01 00:02:10 +0200 | [diff] [blame] | 1707 | buf[pnum] = 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1708 | } |
| 1709 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1710 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) |
| 1711 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1712 | buf[aeb->pnum] = 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1713 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1714 | list_for_each_entry(aeb, &ai->free, u.list) |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1715 | buf[aeb->pnum] = 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1716 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1717 | list_for_each_entry(aeb, &ai->corr, u.list) |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1718 | buf[aeb->pnum] = 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1719 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1720 | list_for_each_entry(aeb, &ai->erase, u.list) |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1721 | buf[aeb->pnum] = 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1722 | |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1723 | list_for_each_entry(aeb, &ai->alien, u.list) |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1724 | buf[aeb->pnum] = 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1725 | |
| 1726 | err = 0; |
| 1727 | for (pnum = 0; pnum < ubi->peb_count; pnum++) |
Mariusz Kozlowski | d9b0744 | 2007-08-01 00:02:10 +0200 | [diff] [blame] | 1728 | if (!buf[pnum]) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1729 | ubi_err("PEB %d is not referred", pnum); |
| 1730 | err = 1; |
| 1731 | } |
| 1732 | |
| 1733 | kfree(buf); |
| 1734 | if (err) |
| 1735 | goto out; |
| 1736 | return 0; |
| 1737 | |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1738 | bad_aeb: |
Artem Bityutskiy | a4e6042 | 2012-05-17 13:09:08 +0300 | [diff] [blame] | 1739 | ubi_err("bad attaching information about LEB %d", aeb->lnum); |
Artem Bityutskiy | 2c5ec5c | 2012-05-17 08:26:24 +0300 | [diff] [blame] | 1740 | ubi_dump_aeb(aeb, 0); |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1741 | ubi_dump_av(av); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1742 | goto out; |
| 1743 | |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1744 | bad_av: |
| 1745 | ubi_err("bad attaching information about volume %d", av->vol_id); |
| 1746 | ubi_dump_av(av); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1747 | goto out; |
| 1748 | |
| 1749 | bad_vid_hdr: |
Artem Bityutskiy | 517af48 | 2012-05-17 14:38:34 +0300 | [diff] [blame] | 1750 | ubi_err("bad attaching information about volume %d", av->vol_id); |
| 1751 | ubi_dump_av(av); |
Artem Bityutskiy | a904e3f | 2012-04-25 09:02:44 +0300 | [diff] [blame] | 1752 | ubi_dump_vid_hdr(vidh); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1753 | |
| 1754 | out: |
Artem Bityutskiy | 25886a3 | 2012-04-24 06:59:49 +0300 | [diff] [blame] | 1755 | dump_stack(); |
Artem Bityutskiy | adbf05e | 2010-01-20 10:28:58 +0200 | [diff] [blame] | 1756 | return -EINVAL; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1757 | } |