^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) International Business Machines Corp., 2006
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) Nokia Corporation, 2006, 2007
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Artem Bityutskiy (Битюцкий Артём)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This file includes volume table manipulation code. The volume table is an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * on-flash table containing volume meta-data like name, number of reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * physical eraseblocks, type, etc. The volume table is stored in the so-called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * "layout volume".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * The layout volume is an internal volume which is organized as follows. It
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * consists of two logical eraseblocks - LEB 0 and LEB 1. Each logical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * eraseblock stores one volume table copy, i.e. LEB 0 and LEB 1 duplicate each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * other. This redundancy guarantees robustness to unclean reboots. The volume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * table is basically an array of volume table records. Each record contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * full information about the volume and protected by a CRC checksum. Note,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * nowadays we use the atomic LEB change operation when updating the volume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * table, so we do not really need 2 LEBs anymore, but we preserve the older
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * design for the backward compatibility reasons.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * When the volume table is changed, it is first changed in RAM. Then LEB 0 is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * erased, and the updated volume table is written back to LEB 0. Then same for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * LEB 1. This scheme guarantees recoverability from unclean reboots.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * In this UBI implementation the on-flash volume table does not contain any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * information about how much data static volumes contain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * But it would still be beneficial to store this information in the volume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * table. For example, suppose we have a static volume X, and all its physical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * eraseblocks became bad for some reasons. Suppose we are attaching the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * corresponding MTD device, for some reason we find no logical eraseblocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * corresponding to the volume X. According to the volume table volume X does
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * exist. So we don't know whether it is just empty or all its physical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * eraseblocks went bad. So we cannot alarm the user properly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * The volume table also stores so-called "update marker", which is used for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * volume updates. Before updating the volume, the update marker is set, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * after the update operation is finished, the update marker is cleared. So if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * the update operation was interrupted (e.g. by an unclean reboot) - the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * update marker is still there and we know that the volume's contents is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * damaged.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/crc32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <asm/div64.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include "ubi.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void self_vtbl_check(const struct ubi_device *ubi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* Empty volume table record */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static struct ubi_vtbl_record empty_vtbl_record;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * ubi_update_layout_vol - helper for updatting layout volumes on flash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int ubi_update_layout_vol(struct ubi_device *ubi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct ubi_volume *layout_vol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) layout_vol = ubi->volumes[vol_id2idx(ubi, UBI_LAYOUT_VOLUME_ID)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) err = ubi_eba_atomic_leb_change(ubi, layout_vol, i, ubi->vtbl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) ubi->vtbl_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * ubi_change_vtbl_record - change volume table record.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * @idx: table index to change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * @vtbl_rec: new volume table record
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * This function changes volume table record @idx. If @vtbl_rec is %NULL, empty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * volume table record is written. The caller does not have to calculate CRC of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * the record as it is done by this function. Returns zero in case of success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct ubi_vtbl_record *vtbl_rec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) uint32_t crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) ubi_assert(idx >= 0 && idx < ubi->vtbl_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (!vtbl_rec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) vtbl_rec = &empty_vtbl_record;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) crc = crc32(UBI_CRC32_INIT, vtbl_rec, UBI_VTBL_RECORD_SIZE_CRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) vtbl_rec->crc = cpu_to_be32(crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) memcpy(&ubi->vtbl[idx], vtbl_rec, sizeof(struct ubi_vtbl_record));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) err = ubi_update_layout_vol(ubi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) self_vtbl_check(ubi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return err ? err : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * ubi_vtbl_rename_volumes - rename UBI volumes in the volume table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * @rename_list: list of &struct ubi_rename_entry objects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * This function re-names multiple volumes specified in @req in the volume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * table. Returns zero in case of success and a negative error code in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct list_head *rename_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct ubi_rename_entry *re;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) list_for_each_entry(re, rename_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) uint32_t crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct ubi_volume *vol = re->desc->vol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct ubi_vtbl_record *vtbl_rec = &ubi->vtbl[vol->vol_id];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (re->remove) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) memcpy(vtbl_rec, &empty_vtbl_record,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) sizeof(struct ubi_vtbl_record));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) vtbl_rec->name_len = cpu_to_be16(re->new_name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) memcpy(vtbl_rec->name, re->new_name, re->new_name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) memset(vtbl_rec->name + re->new_name_len, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) UBI_VOL_NAME_MAX + 1 - re->new_name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) crc = crc32(UBI_CRC32_INIT, vtbl_rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) UBI_VTBL_RECORD_SIZE_CRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) vtbl_rec->crc = cpu_to_be32(crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return ubi_update_layout_vol(ubi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * vtbl_check - check if volume table is not corrupted and sensible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * @vtbl: volume table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * This function returns zero if @vtbl is all right, %1 if CRC is incorrect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * and %-EINVAL if it contains inconsistent data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int vtbl_check(const struct ubi_device *ubi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) const struct ubi_vtbl_record *vtbl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) int i, n, reserved_pebs, alignment, data_pad, vol_type, name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) int upd_marker, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) uint32_t crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) for (i = 0; i < ubi->vtbl_slots; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) alignment = be32_to_cpu(vtbl[i].alignment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) data_pad = be32_to_cpu(vtbl[i].data_pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) upd_marker = vtbl[i].upd_marker;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) vol_type = vtbl[i].vol_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) name_len = be16_to_cpu(vtbl[i].name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) name = &vtbl[i].name[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) crc = crc32(UBI_CRC32_INIT, &vtbl[i], UBI_VTBL_RECORD_SIZE_CRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (be32_to_cpu(vtbl[i].crc) != crc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) ubi_err(ubi, "bad CRC at record %u: %#08x, not %#08x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) i, crc, be32_to_cpu(vtbl[i].crc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) ubi_dump_vtbl_record(&vtbl[i], i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (reserved_pebs == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (memcmp(&vtbl[i], &empty_vtbl_record,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) UBI_VTBL_RECORD_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) err = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (reserved_pebs < 0 || alignment < 0 || data_pad < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) name_len < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) err = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (alignment > ubi->leb_size || alignment == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) err = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) n = alignment & (ubi->min_io_size - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (alignment != 1 && n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) err = 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) n = ubi->leb_size % alignment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (data_pad != n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ubi_err(ubi, "bad data_pad, has to be %d", n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) err = 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) err = 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (upd_marker != 0 && upd_marker != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) err = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (reserved_pebs > ubi->good_peb_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ubi_err(ubi, "too large reserved_pebs %d, good PEBs %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) reserved_pebs, ubi->good_peb_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) err = 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (name_len > UBI_VOL_NAME_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) err = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) if (name[0] == '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) err = 11;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (name_len != strnlen(name, name_len + 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) err = 12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /* Checks that all names are unique */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) for (i = 0; i < ubi->vtbl_slots - 1; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) for (n = i + 1; n < ubi->vtbl_slots; n++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) int len1 = be16_to_cpu(vtbl[i].name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) int len2 = be16_to_cpu(vtbl[n].name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (len1 > 0 && len1 == len2 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) !strncmp(vtbl[i].name, vtbl[n].name, len1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) ubi_err(ubi, "volumes %d and %d have the same name \"%s\"",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) i, n, vtbl[i].name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) ubi_dump_vtbl_record(&vtbl[i], i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) ubi_dump_vtbl_record(&vtbl[n], n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) bad:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) ubi_err(ubi, "volume table check failed: record %d, error %d", i, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) ubi_dump_vtbl_record(&vtbl[i], i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * create_vtbl - create a copy of volume table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * @ai: attaching information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) * @copy: number of the volume table copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * @vtbl: contents of the volume table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * This function returns zero in case of success and a negative error code in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static int create_vtbl(struct ubi_device *ubi, struct ubi_attach_info *ai,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) int copy, void *vtbl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) int err, tries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) struct ubi_vid_io_buf *vidb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct ubi_vid_hdr *vid_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) struct ubi_ainf_peb *new_aeb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) dbg_gen("create volume table (copy #%d)", copy + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) vidb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (!vidb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) vid_hdr = ubi_get_vid_hdr(vidb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) new_aeb = ubi_early_get_peb(ubi, ai);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (IS_ERR(new_aeb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) err = PTR_ERR(new_aeb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) vid_hdr->vol_type = UBI_LAYOUT_VOLUME_TYPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) vid_hdr->vol_id = cpu_to_be32(UBI_LAYOUT_VOLUME_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) vid_hdr->compat = UBI_LAYOUT_VOLUME_COMPAT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) vid_hdr->data_size = vid_hdr->used_ebs =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) vid_hdr->data_pad = cpu_to_be32(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) vid_hdr->lnum = cpu_to_be32(copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) vid_hdr->sqnum = cpu_to_be64(++ai->max_sqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /* The EC header is already there, write the VID header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) err = ubi_io_write_vid_hdr(ubi, new_aeb->pnum, vidb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) goto write_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) /* Write the layout volume contents */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) err = ubi_io_write_data(ubi, vtbl, new_aeb->pnum, 0, ubi->vtbl_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) goto write_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * And add it to the attaching information. Don't delete the old version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * of this LEB as it will be deleted and freed in 'ubi_add_to_av()'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) err = ubi_add_to_av(ubi, ai, new_aeb->pnum, new_aeb->ec, vid_hdr, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) ubi_free_aeb(ai, new_aeb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) ubi_free_vid_buf(vidb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) write_error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (err == -EIO && ++tries <= 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * Probably this physical eraseblock went bad, try to pick
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * another one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) list_add(&new_aeb->u.list, &ai->erase);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) ubi_free_aeb(ai, new_aeb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) ubi_free_vid_buf(vidb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * process_lvol - process the layout volume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * @ai: attaching information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) * @av: layout volume attaching information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * This function is responsible for reading the layout volume, ensuring it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * not corrupted, and recovering from corruptions if needed. Returns volume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * table in case of success and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static struct ubi_vtbl_record *process_lvol(struct ubi_device *ubi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) struct ubi_attach_info *ai,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct ubi_ainf_volume *av)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) struct rb_node *rb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) struct ubi_ainf_peb *aeb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) struct ubi_vtbl_record *leb[UBI_LAYOUT_VOLUME_EBS] = { NULL, NULL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) int leb_corrupted[UBI_LAYOUT_VOLUME_EBS] = {1, 1};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * UBI goes through the following steps when it changes the layout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * volume:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * a. erase LEB 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * b. write new data to LEB 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * c. erase LEB 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * d. write new data to LEB 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * Before the change, both LEBs contain the same data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * Due to unclean reboots, the contents of LEB 0 may be lost, but there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * should LEB 1. So it is OK if LEB 0 is corrupted while LEB 1 is not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * Similarly, LEB 1 may be lost, but there should be LEB 0. And
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * finally, unclean reboots may result in a situation when neither LEB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * 0 nor LEB 1 are corrupted, but they are different. In this case, LEB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * 0 contains more recent information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * So the plan is to first check LEB 0. Then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * a. if LEB 0 is OK, it must be containing the most recent data; then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * we compare it with LEB 1, and if they are different, we copy LEB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) * 0 to LEB 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) * b. if LEB 0 is corrupted, but LEB 1 has to be OK, and we copy LEB 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * to LEB 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) dbg_gen("check layout volume");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /* Read both LEB 0 and LEB 1 into memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) leb[aeb->lnum] = vzalloc(ubi->vtbl_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (!leb[aeb->lnum]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) err = ubi_io_read_data(ubi, leb[aeb->lnum], aeb->pnum, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) ubi->vtbl_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * Scrub the PEB later. Note, -EBADMSG indicates an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * uncorrectable ECC error, but we have our own CRC and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * the data will be checked later. If the data is OK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * the PEB will be scrubbed (because we set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * aeb->scrub). If the data is not OK, the contents of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * the PEB will be recovered from the second copy, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * aeb->scrub will be cleared in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * 'ubi_add_to_av()'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) aeb->scrub = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) else if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (leb[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) leb_corrupted[0] = vtbl_check(ubi, leb[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (leb_corrupted[0] < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (!leb_corrupted[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) /* LEB 0 is OK */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (leb[1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) leb_corrupted[1] = memcmp(leb[0], leb[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) ubi->vtbl_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) if (leb_corrupted[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) ubi_warn(ubi, "volume table copy #2 is corrupted");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) err = create_vtbl(ubi, ai, 1, leb[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) ubi_msg(ubi, "volume table was restored");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) /* Both LEB 1 and LEB 2 are OK and consistent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) vfree(leb[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return leb[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /* LEB 0 is corrupted or does not exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) if (leb[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) leb_corrupted[1] = vtbl_check(ubi, leb[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (leb_corrupted[1] < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (leb_corrupted[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) /* Both LEB 0 and LEB 1 are corrupted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) ubi_err(ubi, "both volume tables are corrupted");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) ubi_warn(ubi, "volume table copy #1 is corrupted");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) err = create_vtbl(ubi, ai, 0, leb[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) ubi_msg(ubi, "volume table was restored");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) vfree(leb[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) return leb[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) vfree(leb[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) vfree(leb[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) * create_empty_lvol - create empty layout volume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * @ai: attaching information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) * This function returns volume table contents in case of success and a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) * negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) static struct ubi_vtbl_record *create_empty_lvol(struct ubi_device *ubi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) struct ubi_attach_info *ai)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) struct ubi_vtbl_record *vtbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) vtbl = vzalloc(ubi->vtbl_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (!vtbl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) for (i = 0; i < ubi->vtbl_slots; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) memcpy(&vtbl[i], &empty_vtbl_record, UBI_VTBL_RECORD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) err = create_vtbl(ubi, ai, i, vtbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) vfree(vtbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return vtbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) * init_volumes - initialize volume information for existing volumes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) * @ai: scanning information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * @vtbl: volume table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * This function allocates volume description objects for existing volumes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * Returns zero in case of success and a negative error code in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) * failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) static int init_volumes(struct ubi_device *ubi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) const struct ubi_attach_info *ai,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) const struct ubi_vtbl_record *vtbl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) int i, err, reserved_pebs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) struct ubi_ainf_volume *av;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) struct ubi_volume *vol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) for (i = 0; i < ubi->vtbl_slots; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (be32_to_cpu(vtbl[i].reserved_pebs) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) continue; /* Empty record */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) if (!vol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) vol->reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) vol->alignment = be32_to_cpu(vtbl[i].alignment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) vol->data_pad = be32_to_cpu(vtbl[i].data_pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) vol->upd_marker = vtbl[i].upd_marker;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) vol->vol_type = vtbl[i].vol_type == UBI_VID_DYNAMIC ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) vol->name_len = be16_to_cpu(vtbl[i].name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) vol->usable_leb_size = ubi->leb_size - vol->data_pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) memcpy(vol->name, vtbl[i].name, vol->name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) vol->name[vol->name_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) vol->vol_id = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (vtbl[i].flags & UBI_VTBL_SKIP_CRC_CHECK_FLG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) vol->skip_check = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) /* Auto re-size flag may be set only for one volume */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) if (ubi->autoresize_vol_id != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) ubi_err(ubi, "more than one auto-resize volume (%d and %d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) ubi->autoresize_vol_id, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) kfree(vol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) ubi->autoresize_vol_id = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) ubi_assert(!ubi->volumes[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) ubi->volumes[i] = vol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) ubi->vol_count += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) vol->ubi = ubi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) reserved_pebs += vol->reserved_pebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) * We use ubi->peb_count and not vol->reserved_pebs because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) * we want to keep the code simple. Otherwise we'd have to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) * resize/check the bitmap upon volume resize too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) * Allocating a few bytes more does not hurt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) err = ubi_fastmap_init_checkmap(vol, ubi->peb_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) * In case of dynamic volume UBI knows nothing about how many
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * data is stored there. So assume the whole volume is used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) vol->used_ebs = vol->reserved_pebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) vol->last_eb_bytes = vol->usable_leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) vol->used_bytes =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) (long long)vol->used_ebs * vol->usable_leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) /* Static volumes only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) av = ubi_find_av(ai, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (!av || !av->leb_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) * No eraseblocks belonging to this volume found. We
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) * don't actually know whether this static volume is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) * completely corrupted or just contains no data. And
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) * we cannot know this as long as data size is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) * stored on flash. So we just assume the volume is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) * empty. FIXME: this should be handled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) if (av->leb_count != av->used_ebs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) * We found a static volume which misses several
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * eraseblocks. Treat it as corrupted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) ubi_warn(ubi, "static volume %d misses %d LEBs - corrupted",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) av->vol_id, av->used_ebs - av->leb_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) vol->corrupted = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) vol->used_ebs = av->used_ebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) vol->used_bytes =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) (long long)(vol->used_ebs - 1) * vol->usable_leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) vol->used_bytes += av->last_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) vol->last_eb_bytes = av->last_data_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) /* And add the layout volume */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if (!vol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) vol->reserved_pebs = UBI_LAYOUT_VOLUME_EBS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) vol->alignment = UBI_LAYOUT_VOLUME_ALIGN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) vol->vol_type = UBI_DYNAMIC_VOLUME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) vol->name_len = sizeof(UBI_LAYOUT_VOLUME_NAME) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) memcpy(vol->name, UBI_LAYOUT_VOLUME_NAME, vol->name_len + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) vol->usable_leb_size = ubi->leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) vol->used_ebs = vol->reserved_pebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) vol->last_eb_bytes = vol->reserved_pebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) vol->used_bytes =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) (long long)vol->used_ebs * (ubi->leb_size - vol->data_pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) vol->vol_id = UBI_LAYOUT_VOLUME_ID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) vol->ref_count = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) ubi_assert(!ubi->volumes[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) ubi->volumes[vol_id2idx(ubi, vol->vol_id)] = vol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) reserved_pebs += vol->reserved_pebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) ubi->vol_count += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) vol->ubi = ubi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) err = ubi_fastmap_init_checkmap(vol, UBI_LAYOUT_VOLUME_EBS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if (reserved_pebs > ubi->avail_pebs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) ubi_err(ubi, "not enough PEBs, required %d, available %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) reserved_pebs, ubi->avail_pebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) if (ubi->corr_peb_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) ubi_err(ubi, "%d PEBs are corrupted and not used",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) ubi->corr_peb_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) ubi->rsvd_pebs += reserved_pebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) ubi->avail_pebs -= reserved_pebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) * check_av - check volume attaching information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * @vol: UBI volume description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) * @av: volume attaching information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * This function returns zero if the volume attaching information is consistent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) * to the data read from the volume tabla, and %-EINVAL if not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) static int check_av(const struct ubi_volume *vol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) const struct ubi_ainf_volume *av)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (av->highest_lnum >= vol->reserved_pebs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) err = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) if (av->leb_count > vol->reserved_pebs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) err = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) if (av->vol_type != vol->vol_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) err = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (av->used_ebs > vol->reserved_pebs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) err = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) if (av->data_pad != vol->data_pad) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) err = 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) goto bad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) bad:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) ubi_err(vol->ubi, "bad attaching information, error %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) ubi_dump_av(av);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) ubi_dump_vol_info(vol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) * check_attaching_info - check that attaching information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * @ai: attaching information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * Even though we protect on-flash data by CRC checksums, we still don't trust
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * the media. This function ensures that attaching information is consistent to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) * the information read from the volume table. Returns zero if the attaching
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) * information is OK and %-EINVAL if it is not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) static int check_attaching_info(const struct ubi_device *ubi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) struct ubi_attach_info *ai)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) int err, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) struct ubi_ainf_volume *av;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) struct ubi_volume *vol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) if (ai->vols_found > UBI_INT_VOL_COUNT + ubi->vtbl_slots) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) ubi_err(ubi, "found %d volumes while attaching, maximum is %d + %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) ai->vols_found, UBI_INT_VOL_COUNT, ubi->vtbl_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) if (ai->highest_vol_id >= ubi->vtbl_slots + UBI_INT_VOL_COUNT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) ai->highest_vol_id < UBI_INTERNAL_VOL_START) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) ubi_err(ubi, "too large volume ID %d found",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) ai->highest_vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) av = ubi_find_av(ai, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) vol = ubi->volumes[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) if (!vol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) if (av)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) ubi_remove_av(ai, av);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (vol->reserved_pebs == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) ubi_assert(i < ubi->vtbl_slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (!av)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) * During attaching we found a volume which does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) * exist according to the information in the volume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) * table. This must have happened due to an unclean
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) * reboot while the volume was being removed. Discard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) * these eraseblocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) ubi_msg(ubi, "finish volume %d removal", av->vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) ubi_remove_av(ai, av);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) } else if (av) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) err = check_av(vol, av);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) * ubi_read_volume_table - read the volume table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) * @ai: attaching information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) * This function reads volume table, checks it, recover from errors if needed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) * or creates it if needed. Returns zero in case of success and a negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) * error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) struct ubi_ainf_volume *av;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) empty_vtbl_record.crc = cpu_to_be32(0xf116c36b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) * The number of supported volumes is limited by the eraseblock size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) * and by the UBI_MAX_VOLUMES constant.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) if (ubi->vtbl_slots > UBI_MAX_VOLUMES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) ubi->vtbl_slots = UBI_MAX_VOLUMES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) ubi->vtbl_size = ubi->vtbl_slots * UBI_VTBL_RECORD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) ubi->vtbl_size = ALIGN(ubi->vtbl_size, ubi->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) av = ubi_find_av(ai, UBI_LAYOUT_VOLUME_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) if (!av) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * No logical eraseblocks belonging to the layout volume were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) * found. This could mean that the flash is just empty. In
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) * this case we create empty layout volume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) * But if flash is not empty this must be a corruption or the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) * MTD device just contains garbage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (ai->is_empty) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) ubi->vtbl = create_empty_lvol(ubi, ai);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) if (IS_ERR(ubi->vtbl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) return PTR_ERR(ubi->vtbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) ubi_err(ubi, "the layout volume was not found");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (av->leb_count > UBI_LAYOUT_VOLUME_EBS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) /* This must not happen with proper UBI images */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) ubi_err(ubi, "too many LEBs (%d) in layout volume",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) av->leb_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) ubi->vtbl = process_lvol(ubi, ai, av);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (IS_ERR(ubi->vtbl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) return PTR_ERR(ubi->vtbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) ubi->avail_pebs = ubi->good_peb_count - ubi->corr_peb_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) * The layout volume is OK, initialize the corresponding in-RAM data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) * structures.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) err = init_volumes(ubi, ai, ubi->vtbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) * Make sure that the attaching information is consistent to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) * information stored in the volume table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) err = check_attaching_info(ubi, ai);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) vfree(ubi->vtbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) ubi_free_all_volumes(ubi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) * self_vtbl_check - check volume table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) * @ubi: UBI device description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) static void self_vtbl_check(const struct ubi_device *ubi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) if (!ubi_dbg_chk_gen(ubi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) if (vtbl_check(ubi, ubi->vtbl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) ubi_err(ubi, "self-check failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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