| /* |
| * 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 <asm/div64.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 |
| |
| 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->volumes_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; |
| 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); |
| 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); |
| |
| 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. |
| */ |
| do_free = 0; |
| 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: |
| 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 |
| * |
| * 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; |
| } |
| |
| 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) |
| { |
| int err; |
| |
| dbg_msg("free volume %d", vol->vol_id); |
| |
| ubi->volumes[vol->vol_id] = NULL; |
| err = 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 |