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Diffstat (limited to 'qemu/roms/u-boot/drivers/mtd/ubi/vtbl.c')
-rw-r--r--qemu/roms/u-boot/drivers/mtd/ubi/vtbl.c826
1 files changed, 0 insertions, 826 deletions
diff --git a/qemu/roms/u-boot/drivers/mtd/ubi/vtbl.c b/qemu/roms/u-boot/drivers/mtd/ubi/vtbl.c
deleted file mode 100644
index 3fbb4a0a9..000000000
--- a/qemu/roms/u-boot/drivers/mtd/ubi/vtbl.c
+++ /dev/null
@@ -1,826 +0,0 @@
-/*
- * Copyright (c) International Business Machines Corp., 2006
- * Copyright (c) Nokia Corporation, 2006, 2007
- *
- * SPDX-License-Identifier: GPL-2.0+
- *
- * Author: Artem Bityutskiy (Битюцкий Артём)
- */
-
-/*
- * This file includes volume table manipulation code. The volume table is an
- * on-flash table containing volume meta-data like name, number of reserved
- * physical eraseblocks, type, etc. The volume table is stored in the so-called
- * "layout volume".
- *
- * The layout volume is an internal volume which is organized as follows. It
- * consists of two logical eraseblocks - LEB 0 and LEB 1. Each logical
- * eraseblock stores one volume table copy, i.e. LEB 0 and LEB 1 duplicate each
- * other. This redundancy guarantees robustness to unclean reboots. The volume
- * table is basically an array of volume table records. Each record contains
- * full information about the volume and protected by a CRC checksum.
- *
- * The volume table is changed, it is first changed in RAM. Then LEB 0 is
- * erased, and the updated volume table is written back to LEB 0. Then same for
- * LEB 1. This scheme guarantees recoverability from unclean reboots.
- *
- * In this UBI implementation the on-flash volume table does not contain any
- * information about how many data static volumes contain. This information may
- * be found from the scanning data.
- *
- * But it would still be beneficial to store this information in the volume
- * table. For example, suppose we have a static volume X, and all its physical
- * eraseblocks became bad for some reasons. Suppose we are attaching the
- * corresponding MTD device, the scanning has found no logical eraseblocks
- * corresponding to the volume X. According to the volume table volume X does
- * exist. So we don't know whether it is just empty or all its physical
- * eraseblocks went bad. So we cannot alarm the user about this corruption.
- *
- * The volume table also stores so-called "update marker", which is used for
- * volume updates. Before updating the volume, the update marker is set, and
- * after the update operation is finished, the update marker is cleared. So if
- * the update operation was interrupted (e.g. by an unclean reboot) - the
- * update marker is still there and we know that the volume's contents is
- * damaged.
- */
-
-#ifdef UBI_LINUX
-#include <linux/crc32.h>
-#include <linux/err.h>
-#include <asm/div64.h>
-#endif
-
-#include <ubi_uboot.h>
-#include "ubi.h"
-
-#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
-static void paranoid_vtbl_check(const struct ubi_device *ubi);
-#else
-#define paranoid_vtbl_check(ubi)
-#endif
-
-/* Empty volume table record */
-static struct ubi_vtbl_record empty_vtbl_record;
-
-/**
- * ubi_change_vtbl_record - change volume table record.
- * @ubi: UBI device description object
- * @idx: table index to change
- * @vtbl_rec: new volume table record
- *
- * This function changes volume table record @idx. If @vtbl_rec is %NULL, empty
- * volume table record is written. The caller does not have to calculate CRC of
- * the record as it is done by this function. Returns zero in case of success
- * and a negative error code in case of failure.
- */
-int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
- struct ubi_vtbl_record *vtbl_rec)
-{
- int i, err;
- uint32_t crc;
- struct ubi_volume *layout_vol;
-
- ubi_assert(idx >= 0 && idx < ubi->vtbl_slots);
- layout_vol = ubi->volumes[vol_id2idx(ubi, UBI_LAYOUT_VOLUME_ID)];
-
- if (!vtbl_rec)
- vtbl_rec = &empty_vtbl_record;
- else {
- crc = crc32(UBI_CRC32_INIT, vtbl_rec, UBI_VTBL_RECORD_SIZE_CRC);
- vtbl_rec->crc = cpu_to_be32(crc);
- }
-
- memcpy(&ubi->vtbl[idx], vtbl_rec, sizeof(struct ubi_vtbl_record));
- for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
- err = ubi_eba_unmap_leb(ubi, layout_vol, i);
- if (err)
- return err;
-
- err = ubi_eba_write_leb(ubi, layout_vol, i, ubi->vtbl, 0,
- ubi->vtbl_size, UBI_LONGTERM);
- if (err)
- return err;
- }
-
- paranoid_vtbl_check(ubi);
- return 0;
-}
-
-/**
- * vtbl_check - check if volume table is not corrupted and contains sensible
- * data.
- * @ubi: UBI device description object
- * @vtbl: volume table
- *
- * This function returns zero if @vtbl is all right, %1 if CRC is incorrect,
- * and %-EINVAL if it contains inconsistent data.
- */
-static int vtbl_check(const struct ubi_device *ubi,
- const struct ubi_vtbl_record *vtbl)
-{
- int i, n, reserved_pebs, alignment, data_pad, vol_type, name_len;
- int upd_marker, err;
- uint32_t crc;
- const char *name;
-
- for (i = 0; i < ubi->vtbl_slots; i++) {
- cond_resched();
-
- reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
- alignment = be32_to_cpu(vtbl[i].alignment);
- data_pad = be32_to_cpu(vtbl[i].data_pad);
- upd_marker = vtbl[i].upd_marker;
- vol_type = vtbl[i].vol_type;
- name_len = be16_to_cpu(vtbl[i].name_len);
- name = (const char *) &vtbl[i].name[0];
-
- crc = crc32(UBI_CRC32_INIT, &vtbl[i], UBI_VTBL_RECORD_SIZE_CRC);
- if (be32_to_cpu(vtbl[i].crc) != crc) {
- ubi_err("bad CRC at record %u: %#08x, not %#08x",
- i, crc, be32_to_cpu(vtbl[i].crc));
- ubi_dbg_dump_vtbl_record(&vtbl[i], i);
- return 1;
- }
-
- if (reserved_pebs == 0) {
- if (memcmp(&vtbl[i], &empty_vtbl_record,
- UBI_VTBL_RECORD_SIZE)) {
- err = 2;
- goto bad;
- }
- continue;
- }
-
- if (reserved_pebs < 0 || alignment < 0 || data_pad < 0 ||
- name_len < 0) {
- err = 3;
- goto bad;
- }
-
- if (alignment > ubi->leb_size || alignment == 0) {
- err = 4;
- goto bad;
- }
-
- n = alignment & (ubi->min_io_size - 1);
- if (alignment != 1 && n) {
- err = 5;
- goto bad;
- }
-
- n = ubi->leb_size % alignment;
- if (data_pad != n) {
- dbg_err("bad data_pad, has to be %d", n);
- err = 6;
- goto bad;
- }
-
- if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) {
- err = 7;
- goto bad;
- }
-
- if (upd_marker != 0 && upd_marker != 1) {
- err = 8;
- goto bad;
- }
-
- if (reserved_pebs > ubi->good_peb_count) {
- dbg_err("too large reserved_pebs, good PEBs %d",
- ubi->good_peb_count);
- err = 9;
- goto bad;
- }
-
- if (name_len > UBI_VOL_NAME_MAX) {
- err = 10;
- goto bad;
- }
-
- if (name[0] == '\0') {
- err = 11;
- goto bad;
- }
-
- if (name_len != strnlen(name, name_len + 1)) {
- err = 12;
- goto bad;
- }
- }
-
- /* Checks that all names are unique */
- for (i = 0; i < ubi->vtbl_slots - 1; i++) {
- for (n = i + 1; n < ubi->vtbl_slots; n++) {
- int len1 = be16_to_cpu(vtbl[i].name_len);
- int len2 = be16_to_cpu(vtbl[n].name_len);
-
- if (len1 > 0 && len1 == len2 &&
- !strncmp((char *)vtbl[i].name, (char *)vtbl[n].name, len1)) {
- ubi_err("volumes %d and %d have the same name"
- " \"%s\"", i, n, vtbl[i].name);
- ubi_dbg_dump_vtbl_record(&vtbl[i], i);
- ubi_dbg_dump_vtbl_record(&vtbl[n], n);
- return -EINVAL;
- }
- }
- }
-
- return 0;
-
-bad:
- ubi_err("volume table check failed: record %d, error %d", i, err);
- ubi_dbg_dump_vtbl_record(&vtbl[i], i);
- return -EINVAL;
-}
-
-/**
- * create_vtbl - create a copy of volume table.
- * @ubi: UBI device description object
- * @si: scanning information
- * @copy: number of the volume table copy
- * @vtbl: contents of the volume table
- *
- * This function returns zero in case of success and a negative error code in
- * case of failure.
- */
-static int create_vtbl(struct ubi_device *ubi, struct ubi_scan_info *si,
- int copy, void *vtbl)
-{
- int err, tries = 0;
- static struct ubi_vid_hdr *vid_hdr;
- struct ubi_scan_volume *sv;
- struct ubi_scan_leb *new_seb, *old_seb = NULL;
-
- ubi_msg("create volume table (copy #%d)", copy + 1);
-
- vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
- if (!vid_hdr)
- return -ENOMEM;
-
- /*
- * Check if there is a logical eraseblock which would have to contain
- * this volume table copy was found during scanning. It has to be wiped
- * out.
- */
- sv = ubi_scan_find_sv(si, UBI_LAYOUT_VOLUME_ID);
- if (sv)
- old_seb = ubi_scan_find_seb(sv, copy);
-
-retry:
- new_seb = ubi_scan_get_free_peb(ubi, si);
- if (IS_ERR(new_seb)) {
- err = PTR_ERR(new_seb);
- goto out_free;
- }
-
- vid_hdr->vol_type = UBI_VID_DYNAMIC;
- vid_hdr->vol_id = cpu_to_be32(UBI_LAYOUT_VOLUME_ID);
- vid_hdr->compat = UBI_LAYOUT_VOLUME_COMPAT;
- vid_hdr->data_size = vid_hdr->used_ebs =
- vid_hdr->data_pad = cpu_to_be32(0);
- vid_hdr->lnum = cpu_to_be32(copy);
- vid_hdr->sqnum = cpu_to_be64(++si->max_sqnum);
- vid_hdr->leb_ver = cpu_to_be32(old_seb ? old_seb->leb_ver + 1: 0);
-
- /* The EC header is already there, write the VID header */
- err = ubi_io_write_vid_hdr(ubi, new_seb->pnum, vid_hdr);
- if (err)
- goto write_error;
-
- /* Write the layout volume contents */
- err = ubi_io_write_data(ubi, vtbl, new_seb->pnum, 0, ubi->vtbl_size);
- if (err)
- goto write_error;
-
- /*
- * And add it to the scanning information. Don't delete the old
- * @old_seb as it will be deleted and freed in 'ubi_scan_add_used()'.
- */
- err = ubi_scan_add_used(ubi, si, new_seb->pnum, new_seb->ec,
- vid_hdr, 0);
- kfree(new_seb);
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
-
-write_error:
- if (err == -EIO && ++tries <= 5) {
- /*
- * Probably this physical eraseblock went bad, try to pick
- * another one.
- */
- list_add_tail(&new_seb->u.list, &si->corr);
- goto retry;
- }
- kfree(new_seb);
-out_free:
- ubi_free_vid_hdr(ubi, vid_hdr);
- return err;
-
-}
-
-/**
- * process_lvol - process the layout volume.
- * @ubi: UBI device description object
- * @si: scanning information
- * @sv: layout volume scanning information
- *
- * This function is responsible for reading the layout volume, ensuring it is
- * not corrupted, and recovering from corruptions if needed. Returns volume
- * table in case of success and a negative error code in case of failure.
- */
-static struct ubi_vtbl_record *process_lvol(struct ubi_device *ubi,
- struct ubi_scan_info *si,
- struct ubi_scan_volume *sv)
-{
- int err;
- struct rb_node *rb;
- struct ubi_scan_leb *seb;
- struct ubi_vtbl_record *leb[UBI_LAYOUT_VOLUME_EBS] = { NULL, NULL };
- int leb_corrupted[UBI_LAYOUT_VOLUME_EBS] = {1, 1};
-
- /*
- * UBI goes through the following steps when it changes the layout
- * volume:
- * a. erase LEB 0;
- * b. write new data to LEB 0;
- * c. erase LEB 1;
- * d. write new data to LEB 1.
- *
- * Before the change, both LEBs contain the same data.
- *
- * Due to unclean reboots, the contents of LEB 0 may be lost, but there
- * should LEB 1. So it is OK if LEB 0 is corrupted while LEB 1 is not.
- * Similarly, LEB 1 may be lost, but there should be LEB 0. And
- * finally, unclean reboots may result in a situation when neither LEB
- * 0 nor LEB 1 are corrupted, but they are different. In this case, LEB
- * 0 contains more recent information.
- *
- * So the plan is to first check LEB 0. Then
- * a. if LEB 0 is OK, it must be containing the most resent data; then
- * we compare it with LEB 1, and if they are different, we copy LEB
- * 0 to LEB 1;
- * b. if LEB 0 is corrupted, but LEB 1 has to be OK, and we copy LEB 1
- * to LEB 0.
- */
-
- dbg_msg("check layout volume");
-
- /* Read both LEB 0 and LEB 1 into memory */
- ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) {
- leb[seb->lnum] = vmalloc(ubi->vtbl_size);
- if (!leb[seb->lnum]) {
- err = -ENOMEM;
- goto out_free;
- }
- memset(leb[seb->lnum], 0, ubi->vtbl_size);
-
- err = ubi_io_read_data(ubi, leb[seb->lnum], seb->pnum, 0,
- ubi->vtbl_size);
- if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err))
- /*
- * Scrub the PEB later. Note, -EBADMSG indicates an
- * uncorrectable ECC error, but we have our own CRC and
- * the data will be checked later. If the data is OK,
- * the PEB will be scrubbed (because we set
- * seb->scrub). If the data is not OK, the contents of
- * the PEB will be recovered from the second copy, and
- * seb->scrub will be cleared in
- * 'ubi_scan_add_used()'.
- */
- seb->scrub = 1;
- else if (err)
- goto out_free;
- }
-
- err = -EINVAL;
- if (leb[0]) {
- leb_corrupted[0] = vtbl_check(ubi, leb[0]);
- if (leb_corrupted[0] < 0)
- goto out_free;
- }
-
- if (!leb_corrupted[0]) {
- /* LEB 0 is OK */
- if (leb[1])
- leb_corrupted[1] = memcmp(leb[0], leb[1], ubi->vtbl_size);
- if (leb_corrupted[1]) {
- ubi_warn("volume table copy #2 is corrupted");
- err = create_vtbl(ubi, si, 1, leb[0]);
- if (err)
- goto out_free;
- ubi_msg("volume table was restored");
- }
-
- /* Both LEB 1 and LEB 2 are OK and consistent */
- vfree(leb[1]);
- return leb[0];
- } else {
- /* LEB 0 is corrupted or does not exist */
- if (leb[1]) {
- leb_corrupted[1] = vtbl_check(ubi, leb[1]);
- if (leb_corrupted[1] < 0)
- goto out_free;
- }
- if (leb_corrupted[1]) {
- /* Both LEB 0 and LEB 1 are corrupted */
- ubi_err("both volume tables are corrupted");
- goto out_free;
- }
-
- ubi_warn("volume table copy #1 is corrupted");
- err = create_vtbl(ubi, si, 0, leb[1]);
- if (err)
- goto out_free;
- ubi_msg("volume table was restored");
-
- vfree(leb[0]);
- return leb[1];
- }
-
-out_free:
- vfree(leb[0]);
- vfree(leb[1]);
- return ERR_PTR(err);
-}
-
-/**
- * create_empty_lvol - create empty layout volume.
- * @ubi: UBI device description object
- * @si: scanning information
- *
- * This function returns volume table contents in case of success and a
- * negative error code in case of failure.
- */
-static struct ubi_vtbl_record *create_empty_lvol(struct ubi_device *ubi,
- struct ubi_scan_info *si)
-{
- int i;
- struct ubi_vtbl_record *vtbl;
-
- vtbl = vmalloc(ubi->vtbl_size);
- if (!vtbl)
- return ERR_PTR(-ENOMEM);
- memset(vtbl, 0, ubi->vtbl_size);
-
- for (i = 0; i < ubi->vtbl_slots; i++)
- memcpy(&vtbl[i], &empty_vtbl_record, UBI_VTBL_RECORD_SIZE);
-
- for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
- int err;
-
- err = create_vtbl(ubi, si, i, vtbl);
- if (err) {
- vfree(vtbl);
- return ERR_PTR(err);
- }
- }
-
- return vtbl;
-}
-
-/**
- * init_volumes - initialize volume information for existing volumes.
- * @ubi: UBI device description object
- * @si: scanning information
- * @vtbl: volume table
- *
- * This function allocates volume description objects for existing volumes.
- * Returns zero in case of success and a negative error code in case of
- * failure.
- */
-static int init_volumes(struct ubi_device *ubi, const struct ubi_scan_info *si,
- const struct ubi_vtbl_record *vtbl)
-{
- int i, reserved_pebs = 0;
- struct ubi_scan_volume *sv;
- struct ubi_volume *vol;
-
- for (i = 0; i < ubi->vtbl_slots; i++) {
- cond_resched();
-
- if (be32_to_cpu(vtbl[i].reserved_pebs) == 0)
- continue; /* Empty record */
-
- vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
- if (!vol)
- return -ENOMEM;
-
- vol->reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
- vol->alignment = be32_to_cpu(vtbl[i].alignment);
- vol->data_pad = be32_to_cpu(vtbl[i].data_pad);
- vol->upd_marker = vtbl[i].upd_marker;
- vol->vol_type = vtbl[i].vol_type == UBI_VID_DYNAMIC ?
- UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME;
- vol->name_len = be16_to_cpu(vtbl[i].name_len);
- vol->usable_leb_size = ubi->leb_size - vol->data_pad;
- memcpy(vol->name, vtbl[i].name, vol->name_len);
- vol->name[vol->name_len] = '\0';
- vol->vol_id = i;
-
- if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
- /* Auto re-size flag may be set only for one volume */
- if (ubi->autoresize_vol_id != -1) {
- ubi_err("more then one auto-resize volume (%d "
- "and %d)", ubi->autoresize_vol_id, i);
- kfree(vol);
- return -EINVAL;
- }
-
- ubi->autoresize_vol_id = i;
- }
-
- ubi_assert(!ubi->volumes[i]);
- ubi->volumes[i] = vol;
- ubi->vol_count += 1;
- vol->ubi = ubi;
- reserved_pebs += vol->reserved_pebs;
-
- /*
- * In case of dynamic volume UBI knows nothing about how many
- * data is stored there. So assume the whole volume is used.
- */
- if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
- vol->used_ebs = vol->reserved_pebs;
- vol->last_eb_bytes = vol->usable_leb_size;
- vol->used_bytes =
- (long long)vol->used_ebs * vol->usable_leb_size;
- continue;
- }
-
- /* Static volumes only */
- sv = ubi_scan_find_sv(si, i);
- if (!sv) {
- /*
- * No eraseblocks belonging to this volume found. We
- * don't actually know whether this static volume is
- * completely corrupted or just contains no data. And
- * we cannot know this as long as data size is not
- * stored on flash. So we just assume the volume is
- * empty. FIXME: this should be handled.
- */
- continue;
- }
-
- if (sv->leb_count != sv->used_ebs) {
- /*
- * We found a static volume which misses several
- * eraseblocks. Treat it as corrupted.
- */
- ubi_warn("static volume %d misses %d LEBs - corrupted",
- sv->vol_id, sv->used_ebs - sv->leb_count);
- vol->corrupted = 1;
- continue;
- }
-
- vol->used_ebs = sv->used_ebs;
- vol->used_bytes =
- (long long)(vol->used_ebs - 1) * vol->usable_leb_size;
- vol->used_bytes += sv->last_data_size;
- vol->last_eb_bytes = sv->last_data_size;
- }
-
- /* And add the layout volume */
- vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
- if (!vol)
- return -ENOMEM;
-
- vol->reserved_pebs = UBI_LAYOUT_VOLUME_EBS;
- vol->alignment = 1;
- vol->vol_type = UBI_DYNAMIC_VOLUME;
- vol->name_len = sizeof(UBI_LAYOUT_VOLUME_NAME) - 1;
- memcpy(vol->name, UBI_LAYOUT_VOLUME_NAME, vol->name_len + 1);
- vol->usable_leb_size = ubi->leb_size;
- vol->used_ebs = vol->reserved_pebs;
- vol->last_eb_bytes = vol->reserved_pebs;
- vol->used_bytes =
- (long long)vol->used_ebs * (ubi->leb_size - vol->data_pad);
- vol->vol_id = UBI_LAYOUT_VOLUME_ID;
- vol->ref_count = 1;
-
- ubi_assert(!ubi->volumes[i]);
- ubi->volumes[vol_id2idx(ubi, vol->vol_id)] = vol;
- reserved_pebs += vol->reserved_pebs;
- ubi->vol_count += 1;
- vol->ubi = ubi;
-
- if (reserved_pebs > ubi->avail_pebs)
- ubi_err("not enough PEBs, required %d, available %d",
- reserved_pebs, ubi->avail_pebs);
- ubi->rsvd_pebs += reserved_pebs;
- ubi->avail_pebs -= reserved_pebs;
-
- return 0;
-}
-
-/**
- * check_sv - check volume scanning information.
- * @vol: UBI volume description object
- * @sv: volume scanning information
- *
- * This function returns zero if the volume scanning information is consistent
- * to the data read from the volume tabla, and %-EINVAL if not.
- */
-static int check_sv(const struct ubi_volume *vol,
- const struct ubi_scan_volume *sv)
-{
- int err;
-
- if (sv->highest_lnum >= vol->reserved_pebs) {
- err = 1;
- goto bad;
- }
- if (sv->leb_count > vol->reserved_pebs) {
- err = 2;
- goto bad;
- }
- if (sv->vol_type != vol->vol_type) {
- err = 3;
- goto bad;
- }
- if (sv->used_ebs > vol->reserved_pebs) {
- err = 4;
- goto bad;
- }
- if (sv->data_pad != vol->data_pad) {
- err = 5;
- goto bad;
- }
- return 0;
-
-bad:
- ubi_err("bad scanning information, error %d", err);
- ubi_dbg_dump_sv(sv);
- ubi_dbg_dump_vol_info(vol);
- return -EINVAL;
-}
-
-/**
- * check_scanning_info - check that scanning information.
- * @ubi: UBI device description object
- * @si: scanning information
- *
- * Even though we protect on-flash data by CRC checksums, we still don't trust
- * the media. This function ensures that scanning information is consistent to
- * the information read from the volume table. Returns zero if the scanning
- * information is OK and %-EINVAL if it is not.
- */
-static int check_scanning_info(const struct ubi_device *ubi,
- struct ubi_scan_info *si)
-{
- int err, i;
- struct ubi_scan_volume *sv;
- struct ubi_volume *vol;
-
- if (si->vols_found > UBI_INT_VOL_COUNT + ubi->vtbl_slots) {
- ubi_err("scanning found %d volumes, maximum is %d + %d",
- si->vols_found, UBI_INT_VOL_COUNT, ubi->vtbl_slots);
- return -EINVAL;
- }
-
- if (si->highest_vol_id >= ubi->vtbl_slots + UBI_INT_VOL_COUNT &&
- si->highest_vol_id < UBI_INTERNAL_VOL_START) {
- ubi_err("too large volume ID %d found by scanning",
- si->highest_vol_id);
- return -EINVAL;
- }
-
- for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
- cond_resched();
-
- sv = ubi_scan_find_sv(si, i);
- vol = ubi->volumes[i];
- if (!vol) {
- if (sv)
- ubi_scan_rm_volume(si, sv);
- continue;
- }
-
- if (vol->reserved_pebs == 0) {
- ubi_assert(i < ubi->vtbl_slots);
-
- if (!sv)
- continue;
-
- /*
- * During scanning we found a volume which does not
- * exist according to the information in the volume
- * table. This must have happened due to an unclean
- * reboot while the volume was being removed. Discard
- * these eraseblocks.
- */
- ubi_msg("finish volume %d removal", sv->vol_id);
- ubi_scan_rm_volume(si, sv);
- } else if (sv) {
- err = check_sv(vol, sv);
- if (err)
- return err;
- }
- }
-
- return 0;
-}
-
-/**
- * ubi_read_volume_table - read volume table.
- * information.
- * @ubi: UBI device description object
- * @si: scanning information
- *
- * This function reads volume table, checks it, recover from errors if needed,
- * or creates it if needed. Returns zero in case of success and a negative
- * error code in case of failure.
- */
-int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_scan_info *si)
-{
- int i, err;
- struct ubi_scan_volume *sv;
-
- empty_vtbl_record.crc = cpu_to_be32(0xf116c36b);
-
- /*
- * The number of supported volumes is limited by the eraseblock size
- * and by the UBI_MAX_VOLUMES constant.
- */
- ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE;
- if (ubi->vtbl_slots > UBI_MAX_VOLUMES)
- ubi->vtbl_slots = UBI_MAX_VOLUMES;
-
- ubi->vtbl_size = ubi->vtbl_slots * UBI_VTBL_RECORD_SIZE;
- ubi->vtbl_size = ALIGN(ubi->vtbl_size, ubi->min_io_size);
-
- sv = ubi_scan_find_sv(si, UBI_LAYOUT_VOLUME_ID);
- if (!sv) {
- /*
- * No logical eraseblocks belonging to the layout volume were
- * found. This could mean that the flash is just empty. In
- * this case we create empty layout volume.
- *
- * But if flash is not empty this must be a corruption or the
- * MTD device just contains garbage.
- */
- if (si->is_empty) {
- ubi->vtbl = create_empty_lvol(ubi, si);
- if (IS_ERR(ubi->vtbl))
- return PTR_ERR(ubi->vtbl);
- } else {
- ubi_err("the layout volume was not found");
- return -EINVAL;
- }
- } else {
- if (sv->leb_count > UBI_LAYOUT_VOLUME_EBS) {
- /* This must not happen with proper UBI images */
- dbg_err("too many LEBs (%d) in layout volume",
- sv->leb_count);
- return -EINVAL;
- }
-
- ubi->vtbl = process_lvol(ubi, si, sv);
- if (IS_ERR(ubi->vtbl))
- return PTR_ERR(ubi->vtbl);
- }
-
- ubi->avail_pebs = ubi->good_peb_count;
-
- /*
- * The layout volume is OK, initialize the corresponding in-RAM data
- * structures.
- */
- err = init_volumes(ubi, si, ubi->vtbl);
- if (err)
- goto out_free;
-
- /*
- * Get sure that the scanning information is consistent to the
- * information stored in the volume table.
- */
- err = check_scanning_info(ubi, si);
- if (err)
- goto out_free;
-
- return 0;
-
-out_free:
- vfree(ubi->vtbl);
- for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++)
- if (ubi->volumes[i]) {
- kfree(ubi->volumes[i]);
- ubi->volumes[i] = NULL;
- }
- return err;
-}
-
-#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
-
-/**
- * paranoid_vtbl_check - check volume table.
- * @ubi: UBI device description object
- */
-static void paranoid_vtbl_check(const struct ubi_device *ubi)
-{
- if (vtbl_check(ubi, ubi->vtbl)) {
- ubi_err("paranoid check failed");
- BUG();
- }
-}
-
-#endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */