--- /dev/null
+/*
+ * Copyright (c) International Business Machines Corp., 2006
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * Author: Artem Bityutskiy (Битюцкий Артём)
+ */
+
+/*
+ * This file contains implementation of volume creation, deletion, updating and
+ * resizing.
+ */
+
+#ifdef UBI_LINUX
+#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_check_volumes(struct ubi_device *ubi);
+#else
+#define paranoid_check_volumes(ubi)
+#endif
+
+#ifdef UBI_LINUX
+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;
+}
+#endif
+
+/* Release method for volume devices */
+static void vol_release(struct device *dev)
+{
+ struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
+
+ kfree(vol);
+}
+
+#ifdef UBI_LINUX
+/**
+ * volume_sysfs_init - initialize sysfs for new volume.
+ * @ubi: UBI device description object
+ * @vol: volume description object
+ *
+ * This function returns zero in case of success and a negative error code in
+ * case of failure.
+ *
+ * Note, this function does not free allocated resources in case of failure -
+ * the caller does it. This is because this would cause release() here and the
+ * caller would oops.
+ */
+static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol)
+{
+ int err;
+
+ err = device_create_file(&vol->dev, &attr_vol_reserved_ebs);
+ if (err)
+ return err;
+ err = device_create_file(&vol->dev, &attr_vol_type);
+ if (err)
+ return err;
+ err = device_create_file(&vol->dev, &attr_vol_name);
+ if (err)
+ return err;
+ err = device_create_file(&vol->dev, &attr_vol_corrupted);
+ if (err)
+ return err;
+ err = device_create_file(&vol->dev, &attr_vol_alignment);
+ if (err)
+ return err;
+ err = device_create_file(&vol->dev, &attr_vol_usable_eb_size);
+ if (err)
+ return err;
+ err = device_create_file(&vol->dev, &attr_vol_data_bytes);
+ if (err)
+ return err;
+ err = device_create_file(&vol->dev, &attr_vol_upd_marker);
+ return err;
+}
+
+/**
+ * volume_sysfs_close - close sysfs for a volume.
+ * @vol: volume description object
+ */
+static void volume_sysfs_close(struct ubi_volume *vol)
+{
+ device_remove_file(&vol->dev, &attr_vol_upd_marker);
+ device_remove_file(&vol->dev, &attr_vol_data_bytes);
+ device_remove_file(&vol->dev, &attr_vol_usable_eb_size);
+ device_remove_file(&vol->dev, &attr_vol_alignment);
+ device_remove_file(&vol->dev, &attr_vol_corrupted);
+ device_remove_file(&vol->dev, &attr_vol_name);
+ device_remove_file(&vol->dev, &attr_vol_type);
+ device_remove_file(&vol->dev, &attr_vol_reserved_ebs);
+ device_unregister(&vol->dev);
+}
+#endif
+
+/**
+ * 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->volumes_mutex locked.
+ */
+int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
+{
+ int i, err, vol_id = req->vol_id, dont_free = 0;
+ struct ubi_volume *vol;
+ struct ubi_vtbl_record vtbl_rec;
+ uint64_t bytes;
+ dev_t dev;
+
+ if (ubi->ro_mode)
+ return -EROFS;
+
+ vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
+ if (!vol)
+ return -ENOMEM;
+
+ spin_lock(&ubi->volumes_lock);
+ if (vol_id == UBI_VOL_NUM_AUTO) {
+ /* Find unused volume ID */
+ dbg_msg("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) {
+ dbg_err("out of volume IDs");
+ err = -ENFILE;
+ goto out_unlock;
+ }
+ req->vol_id = vol_id;
+ }
+
+ dbg_msg("volume ID %d, %llu bytes, type %d, name %s",
+ 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]) {
+ dbg_err("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)) {
+ dbg_err("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;
+ bytes = req->bytes;
+ if (do_div(bytes, vol->usable_leb_size))
+ vol->reserved_pebs = 1;
+ vol->reserved_pebs += bytes;
+
+ /* Reserve physical eraseblocks */
+ if (vol->reserved_pebs > ubi->avail_pebs) {
+ dbg_err("not enough PEBs, only %d available", ubi->avail_pebs);
+ 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 + 1);
+ vol->ubi = ubi;
+
+ /*
+ * Finish all pending erases because there may be some LEBs belonging
+ * to the same volume ID.
+ */
+ err = ubi_wl_flush(ubi);
+ if (err)
+ goto out_acc;
+
+ vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
+ if (!vol->eba_tbl) {
+ err = -ENOMEM;
+ goto out_acc;
+ }
+
+ for (i = 0; i < vol->reserved_pebs; i++)
+ vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
+
+ 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 {
+ bytes = vol->used_bytes;
+ vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size);
+ vol->used_ebs = bytes;
+ if (vol->last_eb_bytes)
+ vol->used_ebs += 1;
+ else
+ vol->last_eb_bytes = vol->usable_leb_size;
+ }
+
+ /* 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_id + 1);
+ err = cdev_add(&vol->cdev, dev, 1);
+ if (err) {
+ ubi_err("cannot add character device");
+ goto out_mapping;
+ }
+
+ err = ubi_create_gluebi(ubi, vol);
+ if (err)
+ goto out_cdev;
+
+ vol->dev.release = vol_release;
+ vol->dev.parent = &ubi->dev;
+ vol->dev.devt = dev;
+ vol->dev.class = ubi_class;
+
+ sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
+ err = device_register(&vol->dev);
+ if (err) {
+ ubi_err("cannot register device");
+ goto out_gluebi;
+ }
+
+ err = volume_sysfs_init(ubi, vol);
+ if (err)
+ goto out_sysfs;
+
+ /* 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;
+ memcpy(vtbl_rec.name, vol->name, vol->name_len + 1);
+
+ err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
+ if (err)
+ goto out_sysfs;
+
+ spin_lock(&ubi->volumes_lock);
+ ubi->volumes[vol_id] = vol;
+ ubi->vol_count += 1;
+ spin_unlock(&ubi->volumes_lock);
+
+ paranoid_check_volumes(ubi);
+ return 0;
+
+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.
+ *
+ * Get device reference to prevent the release function from being
+ * called just after sysfs has been closed.
+ */
+ dont_free = 1;
+ get_device(&vol->dev);
+ volume_sysfs_close(vol);
+out_gluebi:
+ if (ubi_destroy_gluebi(vol))
+ dbg_err("cannot destroy gluebi for volume %d:%d",
+ ubi->ubi_num, vol_id);
+out_cdev:
+ cdev_del(&vol->cdev);
+out_mapping:
+ kfree(vol->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);
+ if (dont_free)
+ put_device(&vol->dev);
+ else
+ kfree(vol);
+ ubi_err("cannot create volume %d, error %d", vol_id, err);
+ return err;
+}
+
+/**
+ * ubi_remove_volume - remove volume.
+ * @desc: volume descriptor
+ *
+ * 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->volumes_mutex
+ * locked.
+ */
+int ubi_remove_volume(struct ubi_volume_desc *desc)
+{
+ 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_msg("remove UBI volume %d", 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);
+
+ err = ubi_destroy_gluebi(vol);
+ if (err)
+ goto out_err;
+
+ 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;
+ }
+
+ kfree(vol->eba_tbl);
+ vol->eba_tbl = NULL;
+ cdev_del(&vol->cdev);
+ volume_sysfs_close(vol);
+
+ spin_lock(&ubi->volumes_lock);
+ ubi->rsvd_pebs -= reserved_pebs;
+ ubi->avail_pebs += reserved_pebs;
+ i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
+ if (i > 0) {
+ i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
+ ubi->avail_pebs -= i;
+ ubi->rsvd_pebs += i;
+ ubi->beb_rsvd_pebs += i;
+ if (i > 0)
+ ubi_msg("reserve more %d PEBs", i);
+ }
+ ubi->vol_count -= 1;
+ spin_unlock(&ubi->volumes_lock);
+
+ paranoid_check_volumes(ubi);
+ return 0;
+
+out_err:
+ ubi_err("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->volumes_mutex locked.
+ */
+int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
+{
+ int i, err, pebs, *new_mapping;
+ struct ubi_volume *vol = desc->vol;
+ struct ubi_device *ubi = vol->ubi;
+ struct ubi_vtbl_record vtbl_rec;
+ int vol_id = vol->vol_id;
+
+ if (ubi->ro_mode)
+ return -EROFS;
+
+ dbg_msg("re-size volume %d to from %d to %d PEBs",
+ vol_id, vol->reserved_pebs, reserved_pebs);
+
+ if (vol->vol_type == UBI_STATIC_VOLUME &&
+ reserved_pebs < vol->used_ebs) {
+ dbg_err("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_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
+ if (!new_mapping)
+ return -ENOMEM;
+
+ for (i = 0; i < reserved_pebs; i++)
+ new_mapping[i] = UBI_LEB_UNMAPPED;
+
+ 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) {
+ dbg_err("not enough PEBs: requested %d, available %d",
+ pebs, ubi->avail_pebs);
+ spin_unlock(&ubi->volumes_lock);
+ err = -ENOSPC;
+ goto out_free;
+ }
+ ubi->avail_pebs -= pebs;
+ ubi->rsvd_pebs += pebs;
+ for (i = 0; i < vol->reserved_pebs; i++)
+ new_mapping[i] = vol->eba_tbl[i];
+ kfree(vol->eba_tbl);
+ vol->eba_tbl = new_mapping;
+ spin_unlock(&ubi->volumes_lock);
+ }
+
+ /* Change volume table record */
+ memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
+ vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
+ err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
+ if (err)
+ goto out_acc;
+
+ 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;
+ pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
+ if (pebs > 0) {
+ pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
+ ubi->avail_pebs -= pebs;
+ ubi->rsvd_pebs += pebs;
+ ubi->beb_rsvd_pebs += pebs;
+ if (pebs > 0)
+ ubi_msg("reserve more %d PEBs", pebs);
+ }
+ for (i = 0; i < reserved_pebs; i++)
+ new_mapping[i] = vol->eba_tbl[i];
+ kfree(vol->eba_tbl);
+ vol->eba_tbl = new_mapping;
+ spin_unlock(&ubi->volumes_lock);
+ }
+
+ 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;
+ }
+
+ paranoid_check_volumes(ubi);
+ return 0;
+
+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_mapping);
+ 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_msg("add volume %d", vol_id);
+ ubi_dbg_dump_vol_info(vol);
+
+ /* 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("cannot add character device for volume %d, error %d",
+ vol_id, err);
+ return err;
+ }
+
+ err = ubi_create_gluebi(ubi, vol);
+ if (err)
+ goto out_cdev;
+
+ vol->dev.release = vol_release;
+ vol->dev.parent = &ubi->dev;
+ vol->dev.devt = dev;
+ vol->dev.class = ubi_class;
+ sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
+ err = device_register(&vol->dev);
+ if (err)
+ goto out_gluebi;
+
+ err = volume_sysfs_init(ubi, vol);
+ if (err) {
+ cdev_del(&vol->cdev);
+ err = ubi_destroy_gluebi(vol);
+ volume_sysfs_close(vol);
+ return err;
+ }
+
+ paranoid_check_volumes(ubi);
+ return 0;
+
+out_gluebi:
+ err = ubi_destroy_gluebi(vol);
+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_msg("free volume %d", vol->vol_id);
+
+ ubi->volumes[vol->vol_id] = NULL;
+ ubi_destroy_gluebi(vol);
+ cdev_del(&vol->cdev);
+ volume_sysfs_close(vol);
+}
+
+#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
+
+/**
+ * paranoid_check_volume - check volume information.
+ * @ubi: UBI device description object
+ * @vol_id: volume ID
+ */
+static void paranoid_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("no volume info, but volume exists");
+ goto fail;
+ }
+ spin_unlock(&ubi->volumes_lock);
+ return;
+ }
+
+ if (vol->exclusive) {
+ /*
+ * The volume may be being created at the moment, do not check
+ * it (e.g., it may be in the middle of ubi_create_volume().
+ */
+ spin_unlock(&ubi->volumes_lock);
+ return;
+ }
+
+ if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
+ vol->name_len < 0) {
+ ubi_err("negative values");
+ goto fail;
+ }
+ if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
+ ubi_err("bad alignment");
+ goto fail;
+ }
+
+ n = vol->alignment & (ubi->min_io_size - 1);
+ if (vol->alignment != 1 && n) {
+ ubi_err("alignment is not multiple of min I/O unit");
+ goto fail;
+ }
+
+ n = ubi->leb_size % vol->alignment;
+ if (vol->data_pad != n) {
+ ubi_err("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("bad vol_type");
+ goto fail;
+ }
+
+ if (vol->upd_marker && vol->corrupted) {
+ dbg_err("update marker and corrupted simultaneously");
+ goto fail;
+ }
+
+ if (vol->reserved_pebs > ubi->good_peb_count) {
+ ubi_err("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("bad usable_leb_size, has to be %lld", n);
+ goto fail;
+ }
+
+ if (vol->name_len > UBI_VOL_NAME_MAX) {
+ ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
+ goto fail;
+ }
+
+ if (!vol->name) {
+ ubi_err("NULL volume name");
+ goto fail;
+ }
+
+ n = strnlen(vol->name, vol->name_len + 1);
+ if (n != vol->name_len) {
+ ubi_err("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("corrupted dynamic volume");
+ goto fail;
+ }
+ if (vol->used_ebs != vol->reserved_pebs) {
+ ubi_err("bad used_ebs");
+ goto fail;
+ }
+ if (vol->last_eb_bytes != vol->usable_leb_size) {
+ ubi_err("bad last_eb_bytes");
+ goto fail;
+ }
+ if (vol->used_bytes != n) {
+ ubi_err("bad used_bytes");
+ goto fail;
+ }
+ } else {
+ if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
+ ubi_err("bad used_ebs");
+ goto fail;
+ }
+ if (vol->last_eb_bytes < 0 ||
+ vol->last_eb_bytes > vol->usable_leb_size) {
+ ubi_err("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("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("volume info is different");
+ goto fail;
+ }
+
+ spin_unlock(&ubi->volumes_lock);
+ return;
+
+fail:
+ ubi_err("paranoid check failed for volume %d", vol_id);
+ ubi_dbg_dump_vol_info(vol);
+ ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
+ spin_unlock(&ubi->volumes_lock);
+ BUG();
+}
+
+/**
+ * paranoid_check_volumes - check information about all volumes.
+ * @ubi: UBI device description object
+ */
+static void paranoid_check_volumes(struct ubi_device *ubi)
+{
+ int i;
+
+ for (i = 0; i < ubi->vtbl_slots; i++)
+ paranoid_check_volume(ubi, i);
+}
+#endif
Code Review / kvmfornfv.git / blobdiff