linux/drivers/mtd/ubi/vmt.c
Quentin Schulz c355aa465f ubi: expose the volume CRC check skip flag
Now that we have the logic for skipping CRC check for static UBI volumes
in the core, let's expose it to users.

This makes use of a padding byte in the volume description data
structure as a flag. This flag only tell for now whether we should skip
the CRC check of a volume.

This checks the UBI volume for which we are trying to skip the CRC check
is static.

Let's also make sure that the flags passed to verify_mkvol_req are
valid.

We voluntarily do not take into account the skip_check flag in
vol_cdev_write() as we want to make sure what we wrote was correctly
written.

Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
2018-08-15 00:25:21 +02:00

816 lines
22 KiB
C

/*
* Copyright (c) International Business Machines Corp., 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Artem Bityutskiy (Битюцкий Артём)
*/
/*
* This file contains implementation of volume creation, deletion, updating and
* resizing.
*/
#include <linux/err.h>
#include <linux/math64.h>
#include <linux/slab.h>
#include <linux/export.h>
#include "ubi.h"
static int self_check_volumes(struct ubi_device *ubi);
static ssize_t vol_attribute_show(struct device *dev,
struct device_attribute *attr, char *buf);
/* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */
static struct device_attribute attr_vol_reserved_ebs =
__ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL);
static struct device_attribute attr_vol_type =
__ATTR(type, S_IRUGO, vol_attribute_show, NULL);
static struct device_attribute attr_vol_name =
__ATTR(name, S_IRUGO, vol_attribute_show, NULL);
static struct device_attribute attr_vol_corrupted =
__ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL);
static struct device_attribute attr_vol_alignment =
__ATTR(alignment, S_IRUGO, vol_attribute_show, NULL);
static struct device_attribute attr_vol_usable_eb_size =
__ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL);
static struct device_attribute attr_vol_data_bytes =
__ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL);
static struct device_attribute attr_vol_upd_marker =
__ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL);
/*
* "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'.
*
* Consider a situation:
* A. process 1 opens a sysfs file related to volume Y, say
* /<sysfs>/class/ubi/ubiX_Y/reserved_ebs;
* B. process 2 removes volume Y;
* C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file;
*
* In this situation, this function will return %-ENODEV because it will find
* out that the volume was removed from the @ubi->volumes array.
*/
static ssize_t vol_attribute_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
struct ubi_device *ubi;
ubi = ubi_get_device(vol->ubi->ubi_num);
if (!ubi)
return -ENODEV;
spin_lock(&ubi->volumes_lock);
if (!ubi->volumes[vol->vol_id]) {
spin_unlock(&ubi->volumes_lock);
ubi_put_device(ubi);
return -ENODEV;
}
/* Take a reference to prevent volume removal */
vol->ref_count += 1;
spin_unlock(&ubi->volumes_lock);
if (attr == &attr_vol_reserved_ebs)
ret = sprintf(buf, "%d\n", vol->reserved_pebs);
else if (attr == &attr_vol_type) {
const char *tp;
if (vol->vol_type == UBI_DYNAMIC_VOLUME)
tp = "dynamic";
else
tp = "static";
ret = sprintf(buf, "%s\n", tp);
} else if (attr == &attr_vol_name)
ret = sprintf(buf, "%s\n", vol->name);
else if (attr == &attr_vol_corrupted)
ret = sprintf(buf, "%d\n", vol->corrupted);
else if (attr == &attr_vol_alignment)
ret = sprintf(buf, "%d\n", vol->alignment);
else if (attr == &attr_vol_usable_eb_size)
ret = sprintf(buf, "%d\n", vol->usable_leb_size);
else if (attr == &attr_vol_data_bytes)
ret = sprintf(buf, "%lld\n", vol->used_bytes);
else if (attr == &attr_vol_upd_marker)
ret = sprintf(buf, "%d\n", vol->upd_marker);
else
/* This must be a bug */
ret = -EINVAL;
/* We've done the operation, drop volume and UBI device references */
spin_lock(&ubi->volumes_lock);
vol->ref_count -= 1;
ubi_assert(vol->ref_count >= 0);
spin_unlock(&ubi->volumes_lock);
ubi_put_device(ubi);
return ret;
}
static struct attribute *volume_dev_attrs[] = {
&attr_vol_reserved_ebs.attr,
&attr_vol_type.attr,
&attr_vol_name.attr,
&attr_vol_corrupted.attr,
&attr_vol_alignment.attr,
&attr_vol_usable_eb_size.attr,
&attr_vol_data_bytes.attr,
&attr_vol_upd_marker.attr,
NULL
};
ATTRIBUTE_GROUPS(volume_dev);
/* Release method for volume devices */
static void vol_release(struct device *dev)
{
struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
ubi_eba_replace_table(vol, NULL);
ubi_fastmap_destroy_checkmap(vol);
kfree(vol);
}
/**
* ubi_create_volume - create volume.
* @ubi: UBI device description object
* @req: volume creation request
*
* This function creates volume described by @req. If @req->vol_id id
* %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume
* and saves it in @req->vol_id. Returns zero in case of success and a negative
* error code in case of failure. Note, the caller has to have the
* @ubi->device_mutex locked.
*/
int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
{
int i, err, vol_id = req->vol_id;
struct ubi_volume *vol;
struct ubi_vtbl_record vtbl_rec;
struct ubi_eba_table *eba_tbl = NULL;
if (ubi->ro_mode)
return -EROFS;
vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
if (!vol)
return -ENOMEM;
device_initialize(&vol->dev);
vol->dev.release = vol_release;
vol->dev.parent = &ubi->dev;
vol->dev.class = &ubi_class;
vol->dev.groups = volume_dev_groups;
if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG)
vol->skip_check = 1;
spin_lock(&ubi->volumes_lock);
if (vol_id == UBI_VOL_NUM_AUTO) {
/* Find unused volume ID */
dbg_gen("search for vacant volume ID");
for (i = 0; i < ubi->vtbl_slots; i++)
if (!ubi->volumes[i]) {
vol_id = i;
break;
}
if (vol_id == UBI_VOL_NUM_AUTO) {
ubi_err(ubi, "out of volume IDs");
err = -ENFILE;
goto out_unlock;
}
req->vol_id = vol_id;
}
dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s",
ubi->ubi_num, vol_id, (unsigned long long)req->bytes,
(int)req->vol_type, req->name);
/* Ensure that this volume does not exist */
err = -EEXIST;
if (ubi->volumes[vol_id]) {
ubi_err(ubi, "volume %d already exists", vol_id);
goto out_unlock;
}
/* Ensure that the name is unique */
for (i = 0; i < ubi->vtbl_slots; i++)
if (ubi->volumes[i] &&
ubi->volumes[i]->name_len == req->name_len &&
!strcmp(ubi->volumes[i]->name, req->name)) {
ubi_err(ubi, "volume \"%s\" exists (ID %d)",
req->name, i);
goto out_unlock;
}
/* Calculate how many eraseblocks are requested */
vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment;
vol->reserved_pebs = div_u64(req->bytes + vol->usable_leb_size - 1,
vol->usable_leb_size);
/* Reserve physical eraseblocks */
if (vol->reserved_pebs > ubi->avail_pebs) {
ubi_err(ubi, "not enough PEBs, only %d available",
ubi->avail_pebs);
if (ubi->corr_peb_count)
ubi_err(ubi, "%d PEBs are corrupted and not used",
ubi->corr_peb_count);
err = -ENOSPC;
goto out_unlock;
}
ubi->avail_pebs -= vol->reserved_pebs;
ubi->rsvd_pebs += vol->reserved_pebs;
spin_unlock(&ubi->volumes_lock);
vol->vol_id = vol_id;
vol->alignment = req->alignment;
vol->data_pad = ubi->leb_size % vol->alignment;
vol->vol_type = req->vol_type;
vol->name_len = req->name_len;
memcpy(vol->name, req->name, vol->name_len);
vol->ubi = ubi;
/*
* Finish all pending erases because there may be some LEBs belonging
* to the same volume ID.
*/
err = ubi_wl_flush(ubi, vol_id, UBI_ALL);
if (err)
goto out_acc;
eba_tbl = ubi_eba_create_table(vol, vol->reserved_pebs);
if (IS_ERR(eba_tbl)) {
err = PTR_ERR(eba_tbl);
goto out_acc;
}
ubi_eba_replace_table(vol, eba_tbl);
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;
} else {
vol->used_ebs = div_u64_rem(vol->used_bytes,
vol->usable_leb_size,
&vol->last_eb_bytes);
if (vol->last_eb_bytes != 0)
vol->used_ebs += 1;
else
vol->last_eb_bytes = vol->usable_leb_size;
}
/* Make volume "available" before it becomes accessible via sysfs */
spin_lock(&ubi->volumes_lock);
ubi->volumes[vol_id] = vol;
ubi->vol_count += 1;
spin_unlock(&ubi->volumes_lock);
/* Register character device for the volume */
cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
vol->cdev.owner = THIS_MODULE;
vol->dev.devt = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1);
dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
err = cdev_device_add(&vol->cdev, &vol->dev);
if (err) {
ubi_err(ubi, "cannot add device");
goto out_mapping;
}
/* Fill volume table record */
memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs);
vtbl_rec.alignment = cpu_to_be32(vol->alignment);
vtbl_rec.data_pad = cpu_to_be32(vol->data_pad);
vtbl_rec.name_len = cpu_to_be16(vol->name_len);
if (vol->vol_type == UBI_DYNAMIC_VOLUME)
vtbl_rec.vol_type = UBI_VID_DYNAMIC;
else
vtbl_rec.vol_type = UBI_VID_STATIC;
if (vol->skip_check)
vtbl_rec.flags |= UBI_VTBL_SKIP_CRC_CHECK_FLG;
memcpy(vtbl_rec.name, vol->name, vol->name_len);
err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
if (err)
goto out_sysfs;
ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED);
self_check_volumes(ubi);
return err;
out_sysfs:
/*
* We have registered our device, we should not free the volume
* description object in this function in case of an error - it is
* freed by the release function.
*/
cdev_device_del(&vol->cdev, &vol->dev);
out_mapping:
spin_lock(&ubi->volumes_lock);
ubi->volumes[vol_id] = NULL;
ubi->vol_count -= 1;
spin_unlock(&ubi->volumes_lock);
ubi_eba_destroy_table(eba_tbl);
out_acc:
spin_lock(&ubi->volumes_lock);
ubi->rsvd_pebs -= vol->reserved_pebs;
ubi->avail_pebs += vol->reserved_pebs;
out_unlock:
spin_unlock(&ubi->volumes_lock);
put_device(&vol->dev);
ubi_err(ubi, "cannot create volume %d, error %d", vol_id, err);
return err;
}
/**
* ubi_remove_volume - remove volume.
* @desc: volume descriptor
* @no_vtbl: do not change volume table if not zero
*
* This function removes volume described by @desc. The volume has to be opened
* in "exclusive" mode. Returns zero in case of success and a negative error
* code in case of failure. The caller has to have the @ubi->device_mutex
* locked.
*/
int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
{
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id);
ubi_assert(desc->mode == UBI_EXCLUSIVE);
ubi_assert(vol == ubi->volumes[vol_id]);
if (ubi->ro_mode)
return -EROFS;
spin_lock(&ubi->volumes_lock);
if (vol->ref_count > 1) {
/*
* The volume is busy, probably someone is reading one of its
* sysfs files.
*/
err = -EBUSY;
goto out_unlock;
}
ubi->volumes[vol_id] = NULL;
spin_unlock(&ubi->volumes_lock);
if (!no_vtbl) {
err = ubi_change_vtbl_record(ubi, vol_id, NULL);
if (err)
goto out_err;
}
for (i = 0; i < vol->reserved_pebs; i++) {
err = ubi_eba_unmap_leb(ubi, vol, i);
if (err)
goto out_err;
}
cdev_device_del(&vol->cdev, &vol->dev);
put_device(&vol->dev);
spin_lock(&ubi->volumes_lock);
ubi->rsvd_pebs -= reserved_pebs;
ubi->avail_pebs += reserved_pebs;
ubi_update_reserved(ubi);
ubi->vol_count -= 1;
spin_unlock(&ubi->volumes_lock);
ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED);
if (!no_vtbl)
self_check_volumes(ubi);
return 0;
out_err:
ubi_err(ubi, "cannot remove volume %d, error %d", vol_id, err);
spin_lock(&ubi->volumes_lock);
ubi->volumes[vol_id] = vol;
out_unlock:
spin_unlock(&ubi->volumes_lock);
return err;
}
/**
* ubi_resize_volume - re-size volume.
* @desc: volume descriptor
* @reserved_pebs: new size in physical eraseblocks
*
* This function re-sizes the volume and returns zero in case of success, and a
* negative error code in case of failure. The caller has to have the
* @ubi->device_mutex locked.
*/
int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
{
int i, err, pebs;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
struct ubi_vtbl_record vtbl_rec;
struct ubi_eba_table *new_eba_tbl = NULL;
int vol_id = vol->vol_id;
if (ubi->ro_mode)
return -EROFS;
dbg_gen("re-size device %d, volume %d to from %d to %d PEBs",
ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs);
if (vol->vol_type == UBI_STATIC_VOLUME &&
reserved_pebs < vol->used_ebs) {
ubi_err(ubi, "too small size %d, %d LEBs contain data",
reserved_pebs, vol->used_ebs);
return -EINVAL;
}
/* If the size is the same, we have nothing to do */
if (reserved_pebs == vol->reserved_pebs)
return 0;
new_eba_tbl = ubi_eba_create_table(vol, reserved_pebs);
if (IS_ERR(new_eba_tbl))
return PTR_ERR(new_eba_tbl);
spin_lock(&ubi->volumes_lock);
if (vol->ref_count > 1) {
spin_unlock(&ubi->volumes_lock);
err = -EBUSY;
goto out_free;
}
spin_unlock(&ubi->volumes_lock);
/* Reserve physical eraseblocks */
pebs = reserved_pebs - vol->reserved_pebs;
if (pebs > 0) {
spin_lock(&ubi->volumes_lock);
if (pebs > ubi->avail_pebs) {
ubi_err(ubi, "not enough PEBs: requested %d, available %d",
pebs, ubi->avail_pebs);
if (ubi->corr_peb_count)
ubi_err(ubi, "%d PEBs are corrupted and not used",
ubi->corr_peb_count);
spin_unlock(&ubi->volumes_lock);
err = -ENOSPC;
goto out_free;
}
ubi->avail_pebs -= pebs;
ubi->rsvd_pebs += pebs;
ubi_eba_copy_table(vol, new_eba_tbl, vol->reserved_pebs);
ubi_eba_replace_table(vol, new_eba_tbl);
spin_unlock(&ubi->volumes_lock);
}
if (pebs < 0) {
for (i = 0; i < -pebs; i++) {
err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i);
if (err)
goto out_acc;
}
spin_lock(&ubi->volumes_lock);
ubi->rsvd_pebs += pebs;
ubi->avail_pebs -= pebs;
ubi_update_reserved(ubi);
ubi_eba_copy_table(vol, new_eba_tbl, reserved_pebs);
ubi_eba_replace_table(vol, new_eba_tbl);
spin_unlock(&ubi->volumes_lock);
}
/*
* When we shrink a volume we have to flush all pending (erase) work.
* Otherwise it can happen that upon next attach UBI finds a LEB with
* lnum > highest_lnum and refuses to attach.
*/
if (pebs < 0) {
err = ubi_wl_flush(ubi, vol_id, UBI_ALL);
if (err)
goto out_acc;
}
/* Change volume table record */
vtbl_rec = ubi->vtbl[vol_id];
vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
if (err)
goto out_acc;
vol->reserved_pebs = reserved_pebs;
if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
vol->used_ebs = reserved_pebs;
vol->last_eb_bytes = vol->usable_leb_size;
vol->used_bytes =
(long long)vol->used_ebs * vol->usable_leb_size;
}
ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED);
self_check_volumes(ubi);
return err;
out_acc:
if (pebs > 0) {
spin_lock(&ubi->volumes_lock);
ubi->rsvd_pebs -= pebs;
ubi->avail_pebs += pebs;
spin_unlock(&ubi->volumes_lock);
}
out_free:
kfree(new_eba_tbl);
return err;
}
/**
* ubi_rename_volumes - re-name UBI volumes.
* @ubi: UBI device description object
* @rename_list: list of &struct ubi_rename_entry objects
*
* This function re-names or removes volumes specified in the re-name list.
* Returns zero in case of success and a negative error code in case of
* failure.
*/
int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list)
{
int err;
struct ubi_rename_entry *re;
err = ubi_vtbl_rename_volumes(ubi, rename_list);
if (err)
return err;
list_for_each_entry(re, rename_list, list) {
if (re->remove) {
err = ubi_remove_volume(re->desc, 1);
if (err)
break;
} else {
struct ubi_volume *vol = re->desc->vol;
spin_lock(&ubi->volumes_lock);
vol->name_len = re->new_name_len;
memcpy(vol->name, re->new_name, re->new_name_len + 1);
spin_unlock(&ubi->volumes_lock);
ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED);
}
}
if (!err)
self_check_volumes(ubi);
return err;
}
/**
* ubi_add_volume - add volume.
* @ubi: UBI device description object
* @vol: volume description object
*
* This function adds an existing volume and initializes all its data
* structures. Returns zero in case of success and a negative error code in
* case of failure.
*/
int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
{
int err, vol_id = vol->vol_id;
dev_t dev;
dbg_gen("add volume %d", vol_id);
/* Register character device for the volume */
cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
vol->cdev.owner = THIS_MODULE;
dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1);
err = cdev_add(&vol->cdev, dev, 1);
if (err) {
ubi_err(ubi, "cannot add character device for volume %d, error %d",
vol_id, err);
return err;
}
vol->dev.release = vol_release;
vol->dev.parent = &ubi->dev;
vol->dev.devt = dev;
vol->dev.class = &ubi_class;
vol->dev.groups = volume_dev_groups;
dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
err = device_register(&vol->dev);
if (err)
goto out_cdev;
self_check_volumes(ubi);
return err;
out_cdev:
cdev_del(&vol->cdev);
return err;
}
/**
* ubi_free_volume - free volume.
* @ubi: UBI device description object
* @vol: volume description object
*
* This function frees all resources for volume @vol but does not remove it.
* Used only when the UBI device is detached.
*/
void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol)
{
dbg_gen("free volume %d", vol->vol_id);
ubi->volumes[vol->vol_id] = NULL;
cdev_del(&vol->cdev);
device_unregister(&vol->dev);
}
/**
* self_check_volume - check volume information.
* @ubi: UBI device description object
* @vol_id: volume ID
*
* Returns zero if volume is all right and a a negative error code if not.
*/
static int self_check_volume(struct ubi_device *ubi, int vol_id)
{
int idx = vol_id2idx(ubi, vol_id);
int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
const struct ubi_volume *vol;
long long n;
const char *name;
spin_lock(&ubi->volumes_lock);
reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
vol = ubi->volumes[idx];
if (!vol) {
if (reserved_pebs) {
ubi_err(ubi, "no volume info, but volume exists");
goto fail;
}
spin_unlock(&ubi->volumes_lock);
return 0;
}
if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
vol->name_len < 0) {
ubi_err(ubi, "negative values");
goto fail;
}
if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
ubi_err(ubi, "bad alignment");
goto fail;
}
n = vol->alignment & (ubi->min_io_size - 1);
if (vol->alignment != 1 && n) {
ubi_err(ubi, "alignment is not multiple of min I/O unit");
goto fail;
}
n = ubi->leb_size % vol->alignment;
if (vol->data_pad != n) {
ubi_err(ubi, "bad data_pad, has to be %lld", n);
goto fail;
}
if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
vol->vol_type != UBI_STATIC_VOLUME) {
ubi_err(ubi, "bad vol_type");
goto fail;
}
if (vol->upd_marker && vol->corrupted) {
ubi_err(ubi, "update marker and corrupted simultaneously");
goto fail;
}
if (vol->reserved_pebs > ubi->good_peb_count) {
ubi_err(ubi, "too large reserved_pebs");
goto fail;
}
n = ubi->leb_size - vol->data_pad;
if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
ubi_err(ubi, "bad usable_leb_size, has to be %lld", n);
goto fail;
}
if (vol->name_len > UBI_VOL_NAME_MAX) {
ubi_err(ubi, "too long volume name, max is %d",
UBI_VOL_NAME_MAX);
goto fail;
}
n = strnlen(vol->name, vol->name_len + 1);
if (n != vol->name_len) {
ubi_err(ubi, "bad name_len %lld", n);
goto fail;
}
n = (long long)vol->used_ebs * vol->usable_leb_size;
if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
if (vol->corrupted) {
ubi_err(ubi, "corrupted dynamic volume");
goto fail;
}
if (vol->used_ebs != vol->reserved_pebs) {
ubi_err(ubi, "bad used_ebs");
goto fail;
}
if (vol->last_eb_bytes != vol->usable_leb_size) {
ubi_err(ubi, "bad last_eb_bytes");
goto fail;
}
if (vol->used_bytes != n) {
ubi_err(ubi, "bad used_bytes");
goto fail;
}
if (vol->skip_check) {
ubi_err(ubi, "bad skip_check");
goto fail;
}
} else {
if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
ubi_err(ubi, "bad used_ebs");
goto fail;
}
if (vol->last_eb_bytes < 0 ||
vol->last_eb_bytes > vol->usable_leb_size) {
ubi_err(ubi, "bad last_eb_bytes");
goto fail;
}
if (vol->used_bytes < 0 || vol->used_bytes > n ||
vol->used_bytes < n - vol->usable_leb_size) {
ubi_err(ubi, "bad used_bytes");
goto fail;
}
}
alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment);
data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad);
name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len);
upd_marker = ubi->vtbl[vol_id].upd_marker;
name = &ubi->vtbl[vol_id].name[0];
if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
vol_type = UBI_DYNAMIC_VOLUME;
else
vol_type = UBI_STATIC_VOLUME;
if (alignment != vol->alignment || data_pad != vol->data_pad ||
upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
name_len != vol->name_len || strncmp(name, vol->name, name_len)) {
ubi_err(ubi, "volume info is different");
goto fail;
}
spin_unlock(&ubi->volumes_lock);
return 0;
fail:
ubi_err(ubi, "self-check failed for volume %d", vol_id);
if (vol)
ubi_dump_vol_info(vol);
ubi_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
dump_stack();
spin_unlock(&ubi->volumes_lock);
return -EINVAL;
}
/**
* self_check_volumes - check information about all volumes.
* @ubi: UBI device description object
*
* Returns zero if volumes are all right and a a negative error code if not.
*/
static int self_check_volumes(struct ubi_device *ubi)
{
int i, err = 0;
if (!ubi_dbg_chk_gen(ubi))
return 0;
for (i = 0; i < ubi->vtbl_slots; i++) {
err = self_check_volume(ubi, i);
if (err)
break;
}
return err;
}