/* * 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 "ubi.h" #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID static int paranoid_check_volumes(struct ubi_device *ubi); #else #define paranoid_check_volumes(ubi) 0 #endif 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; } /* 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->eba_tbl); kfree(vol); } /** * 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); } /** * 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, do_free = 1; struct ubi_volume *vol; struct ubi_vtbl_record vtbl_rec; 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_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) { dbg_err("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]) { 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; 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) { 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); 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 { 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; } /* 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; } vol->dev.release = vol_release; vol->dev.parent = &ubi->dev; vol->dev.devt = dev; vol->dev.class = ubi_class; dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); err = device_register(&vol->dev); if (err) { ubi_err("cannot register device"); goto out_cdev; } 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); 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); ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED); if (paranoid_check_volumes(ubi)) dbg_err("check failed while creating volume %d", vol_id); 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. * * Get device reference to prevent the release function from being * called just after sysfs has been closed. */ do_free = 0; get_device(&vol->dev); volume_sysfs_close(vol); out_cdev: cdev_del(&vol->cdev); out_mapping: if (do_free) 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 (do_free) kfree(vol); else put_device(&vol->dev); ubi_err("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_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); ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED); if (!no_vtbl && paranoid_check_volumes(ubi)) dbg_err("check failed while removing volume %d", vol_id); return err; 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->device_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_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) { 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; } ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED); if (paranoid_check_volumes(ubi)) dbg_err("check failed while re-sizing volume %d", vol_id); 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_mapping); 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 && paranoid_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("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; dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); err = device_register(&vol->dev); if (err) goto out_cdev; err = volume_sysfs_init(ubi, vol); if (err) { cdev_del(&vol->cdev); volume_sysfs_close(vol); return err; } if (paranoid_check_volumes(ubi)) dbg_err("check failed while adding volume %d", vol_id); 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); 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 * * Returns zero if volume is all right and a a negative error code if not. */ static int 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 0; } 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 0; fail: ubi_err("paranoid check failed for volume %d", vol_id); if (vol) ubi_dbg_dump_vol_info(vol); ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); dump_stack(); spin_unlock(&ubi->volumes_lock); return -EINVAL; } /** * paranoid_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 paranoid_check_volumes(struct ubi_device *ubi) { int i, err = 0; for (i = 0; i < ubi->vtbl_slots; i++) { err = paranoid_check_volume(ubi, i); if (err) break; } return err; } #endif