Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) International Business Machines Corp., 2006 |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 12 | * the GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | * Author: Artem Bityutskiy (Битюцкий Артём) |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * This file contains implementation of volume creation, deletion, updating and |
| 23 | * resizing. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/err.h> |
| 27 | #include <asm/div64.h> |
| 28 | #include "ubi.h" |
| 29 | |
| 30 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 31 | static int paranoid_check_volumes(struct ubi_device *ubi); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 32 | #else |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 33 | #define paranoid_check_volumes(ubi) 0 |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 34 | #endif |
| 35 | |
| 36 | static ssize_t vol_attribute_show(struct device *dev, |
| 37 | struct device_attribute *attr, char *buf); |
| 38 | |
| 39 | /* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */ |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 40 | static struct device_attribute attr_vol_reserved_ebs = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 41 | __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 42 | static struct device_attribute attr_vol_type = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 43 | __ATTR(type, S_IRUGO, vol_attribute_show, NULL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 44 | static struct device_attribute attr_vol_name = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 45 | __ATTR(name, S_IRUGO, vol_attribute_show, NULL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 46 | static struct device_attribute attr_vol_corrupted = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 47 | __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 48 | static struct device_attribute attr_vol_alignment = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 49 | __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 50 | static struct device_attribute attr_vol_usable_eb_size = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 51 | __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 52 | static struct device_attribute attr_vol_data_bytes = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 53 | __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 54 | static struct device_attribute attr_vol_upd_marker = |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 55 | __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL); |
| 56 | |
| 57 | /* |
| 58 | * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'. |
| 59 | * |
| 60 | * Consider a situation: |
| 61 | * A. process 1 opens a sysfs file related to volume Y, say |
| 62 | * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs; |
| 63 | * B. process 2 removes volume Y; |
| 64 | * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file; |
| 65 | * |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 66 | * In this situation, this function will return %-ENODEV because it will find |
| 67 | * out that the volume was removed from the @ubi->volumes array. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 68 | */ |
| 69 | static ssize_t vol_attribute_show(struct device *dev, |
| 70 | struct device_attribute *attr, char *buf) |
| 71 | { |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 72 | int ret; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 73 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
Artem Bityutskiy | e73f445 | 2007-12-17 17:37:26 +0200 | [diff] [blame] | 74 | struct ubi_device *ubi; |
| 75 | |
| 76 | ubi = ubi_get_device(vol->ubi->ubi_num); |
| 77 | if (!ubi) |
| 78 | return -ENODEV; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 79 | |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 80 | spin_lock(&ubi->volumes_lock); |
| 81 | if (!ubi->volumes[vol->vol_id]) { |
| 82 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | e73f445 | 2007-12-17 17:37:26 +0200 | [diff] [blame] | 83 | ubi_put_device(ubi); |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 84 | return -ENODEV; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 85 | } |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 86 | /* Take a reference to prevent volume removal */ |
| 87 | vol->ref_count += 1; |
| 88 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | 732aeac | 2007-12-15 15:09:07 +0200 | [diff] [blame] | 89 | |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 90 | if (attr == &attr_vol_reserved_ebs) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 91 | ret = sprintf(buf, "%d\n", vol->reserved_pebs); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 92 | else if (attr == &attr_vol_type) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 93 | const char *tp; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 94 | |
| 95 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
| 96 | tp = "dynamic"; |
| 97 | else |
| 98 | tp = "static"; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 99 | ret = sprintf(buf, "%s\n", tp); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 100 | } else if (attr == &attr_vol_name) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 101 | ret = sprintf(buf, "%s\n", vol->name); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 102 | else if (attr == &attr_vol_corrupted) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 103 | ret = sprintf(buf, "%d\n", vol->corrupted); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 104 | else if (attr == &attr_vol_alignment) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 105 | ret = sprintf(buf, "%d\n", vol->alignment); |
Artem Bityutskiy | 732aeac | 2007-12-15 15:09:07 +0200 | [diff] [blame] | 106 | else if (attr == &attr_vol_usable_eb_size) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 107 | ret = sprintf(buf, "%d\n", vol->usable_leb_size); |
Artem Bityutskiy | 732aeac | 2007-12-15 15:09:07 +0200 | [diff] [blame] | 108 | else if (attr == &attr_vol_data_bytes) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 109 | ret = sprintf(buf, "%lld\n", vol->used_bytes); |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 110 | else if (attr == &attr_vol_upd_marker) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 111 | ret = sprintf(buf, "%d\n", vol->upd_marker); |
| 112 | else |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 113 | /* This must be a bug */ |
| 114 | ret = -EINVAL; |
| 115 | |
Artem Bityutskiy | e73f445 | 2007-12-17 17:37:26 +0200 | [diff] [blame] | 116 | /* We've done the operation, drop volume and UBI device references */ |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 117 | spin_lock(&ubi->volumes_lock); |
| 118 | vol->ref_count -= 1; |
| 119 | ubi_assert(vol->ref_count >= 0); |
| 120 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | e73f445 | 2007-12-17 17:37:26 +0200 | [diff] [blame] | 121 | ubi_put_device(ubi); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 122 | return ret; |
| 123 | } |
| 124 | |
| 125 | /* Release method for volume devices */ |
| 126 | static void vol_release(struct device *dev) |
| 127 | { |
| 128 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
Artem Bityutskiy | 732aeac | 2007-12-15 15:09:07 +0200 | [diff] [blame] | 129 | |
Artem Bityutskiy | abc5e92 | 2008-06-04 16:48:12 +0300 | [diff] [blame] | 130 | kfree(vol->eba_tbl); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 131 | kfree(vol); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * volume_sysfs_init - initialize sysfs for new volume. |
| 136 | * @ubi: UBI device description object |
| 137 | * @vol: volume description object |
| 138 | * |
| 139 | * This function returns zero in case of success and a negative error code in |
| 140 | * case of failure. |
| 141 | * |
| 142 | * Note, this function does not free allocated resources in case of failure - |
| 143 | * the caller does it. This is because this would cause release() here and the |
| 144 | * caller would oops. |
| 145 | */ |
| 146 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) |
| 147 | { |
| 148 | int err; |
| 149 | |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 150 | err = device_create_file(&vol->dev, &attr_vol_reserved_ebs); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 151 | if (err) |
| 152 | return err; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 153 | err = device_create_file(&vol->dev, &attr_vol_type); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 154 | if (err) |
| 155 | return err; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 156 | err = device_create_file(&vol->dev, &attr_vol_name); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 157 | if (err) |
| 158 | return err; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 159 | err = device_create_file(&vol->dev, &attr_vol_corrupted); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 160 | if (err) |
| 161 | return err; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 162 | err = device_create_file(&vol->dev, &attr_vol_alignment); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 163 | if (err) |
| 164 | return err; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 165 | err = device_create_file(&vol->dev, &attr_vol_usable_eb_size); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 166 | if (err) |
| 167 | return err; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 168 | err = device_create_file(&vol->dev, &attr_vol_data_bytes); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 169 | if (err) |
| 170 | return err; |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 171 | err = device_create_file(&vol->dev, &attr_vol_upd_marker); |
Artem Bityutskiy | fc75a1e | 2007-12-17 14:02:09 +0200 | [diff] [blame] | 172 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | /** |
| 176 | * volume_sysfs_close - close sysfs for a volume. |
| 177 | * @vol: volume description object |
| 178 | */ |
| 179 | static void volume_sysfs_close(struct ubi_volume *vol) |
| 180 | { |
Artem Bityutskiy | 8bc2296 | 2007-07-22 15:25:02 +0300 | [diff] [blame] | 181 | device_remove_file(&vol->dev, &attr_vol_upd_marker); |
| 182 | device_remove_file(&vol->dev, &attr_vol_data_bytes); |
| 183 | device_remove_file(&vol->dev, &attr_vol_usable_eb_size); |
| 184 | device_remove_file(&vol->dev, &attr_vol_alignment); |
| 185 | device_remove_file(&vol->dev, &attr_vol_corrupted); |
| 186 | device_remove_file(&vol->dev, &attr_vol_name); |
| 187 | device_remove_file(&vol->dev, &attr_vol_type); |
| 188 | device_remove_file(&vol->dev, &attr_vol_reserved_ebs); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 189 | device_unregister(&vol->dev); |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * ubi_create_volume - create volume. |
| 194 | * @ubi: UBI device description object |
| 195 | * @req: volume creation request |
| 196 | * |
| 197 | * This function creates volume described by @req. If @req->vol_id id |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 198 | * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 199 | * and saves it in @req->vol_id. Returns zero in case of success and a negative |
Artem Bityutskiy | 40e4d0c | 2007-12-17 17:08:55 +0200 | [diff] [blame] | 200 | * error code in case of failure. Note, the caller has to have the |
| 201 | * @ubi->volumes_mutex locked. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 202 | */ |
| 203 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) |
| 204 | { |
Artem Bityutskiy | abc5e92 | 2008-06-04 16:48:12 +0300 | [diff] [blame] | 205 | int i, err, vol_id = req->vol_id, do_free = 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 206 | struct ubi_volume *vol; |
| 207 | struct ubi_vtbl_record vtbl_rec; |
| 208 | uint64_t bytes; |
Artem Bityutskiy | 49dfc29 | 2007-12-15 18:13:56 +0200 | [diff] [blame] | 209 | dev_t dev; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 210 | |
| 211 | if (ubi->ro_mode) |
| 212 | return -EROFS; |
| 213 | |
| 214 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); |
| 215 | if (!vol) |
| 216 | return -ENOMEM; |
| 217 | |
| 218 | spin_lock(&ubi->volumes_lock); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 219 | if (vol_id == UBI_VOL_NUM_AUTO) { |
| 220 | /* Find unused volume ID */ |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 221 | dbg_gen("search for vacant volume ID"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 222 | for (i = 0; i < ubi->vtbl_slots; i++) |
| 223 | if (!ubi->volumes[i]) { |
| 224 | vol_id = i; |
| 225 | break; |
| 226 | } |
| 227 | |
| 228 | if (vol_id == UBI_VOL_NUM_AUTO) { |
| 229 | dbg_err("out of volume IDs"); |
| 230 | err = -ENFILE; |
| 231 | goto out_unlock; |
| 232 | } |
| 233 | req->vol_id = vol_id; |
| 234 | } |
| 235 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 236 | dbg_gen("volume ID %d, %llu bytes, type %d, name %s", |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 237 | vol_id, (unsigned long long)req->bytes, |
| 238 | (int)req->vol_type, req->name); |
| 239 | |
| 240 | /* Ensure that this volume does not exist */ |
| 241 | err = -EEXIST; |
| 242 | if (ubi->volumes[vol_id]) { |
| 243 | dbg_err("volume %d already exists", vol_id); |
| 244 | goto out_unlock; |
| 245 | } |
| 246 | |
| 247 | /* Ensure that the name is unique */ |
| 248 | for (i = 0; i < ubi->vtbl_slots; i++) |
| 249 | if (ubi->volumes[i] && |
| 250 | ubi->volumes[i]->name_len == req->name_len && |
Artem Bityutskiy | 94784d9 | 2007-06-18 12:06:30 +0300 | [diff] [blame] | 251 | !strcmp(ubi->volumes[i]->name, req->name)) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 252 | dbg_err("volume \"%s\" exists (ID %d)", req->name, i); |
| 253 | goto out_unlock; |
| 254 | } |
| 255 | |
| 256 | /* Calculate how many eraseblocks are requested */ |
| 257 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; |
| 258 | bytes = req->bytes; |
| 259 | if (do_div(bytes, vol->usable_leb_size)) |
| 260 | vol->reserved_pebs = 1; |
| 261 | vol->reserved_pebs += bytes; |
| 262 | |
| 263 | /* Reserve physical eraseblocks */ |
| 264 | if (vol->reserved_pebs > ubi->avail_pebs) { |
| 265 | dbg_err("not enough PEBs, only %d available", ubi->avail_pebs); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 266 | err = -ENOSPC; |
| 267 | goto out_unlock; |
| 268 | } |
| 269 | ubi->avail_pebs -= vol->reserved_pebs; |
| 270 | ubi->rsvd_pebs += vol->reserved_pebs; |
Artem Bityutskiy | e73f445 | 2007-12-17 17:37:26 +0200 | [diff] [blame] | 271 | spin_unlock(&ubi->volumes_lock); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 272 | |
| 273 | vol->vol_id = vol_id; |
| 274 | vol->alignment = req->alignment; |
| 275 | vol->data_pad = ubi->leb_size % vol->alignment; |
| 276 | vol->vol_type = req->vol_type; |
| 277 | vol->name_len = req->name_len; |
Artem Bityutskiy | a6ea440 | 2008-07-13 21:46:24 +0300 | [diff] [blame] | 278 | memcpy(vol->name, req->name, vol->name_len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 279 | vol->ubi = ubi; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 280 | |
| 281 | /* |
| 282 | * Finish all pending erases because there may be some LEBs belonging |
| 283 | * to the same volume ID. |
| 284 | */ |
| 285 | err = ubi_wl_flush(ubi); |
| 286 | if (err) |
| 287 | goto out_acc; |
| 288 | |
| 289 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); |
| 290 | if (!vol->eba_tbl) { |
| 291 | err = -ENOMEM; |
| 292 | goto out_acc; |
| 293 | } |
| 294 | |
| 295 | for (i = 0; i < vol->reserved_pebs; i++) |
| 296 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; |
| 297 | |
| 298 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
| 299 | vol->used_ebs = vol->reserved_pebs; |
| 300 | vol->last_eb_bytes = vol->usable_leb_size; |
Vinit Agnihotri | d08c3b7 | 2007-07-10 13:04:59 +0300 | [diff] [blame] | 301 | vol->used_bytes = |
| 302 | (long long)vol->used_ebs * vol->usable_leb_size; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 303 | } else { |
| 304 | bytes = vol->used_bytes; |
| 305 | vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size); |
| 306 | vol->used_ebs = bytes; |
| 307 | if (vol->last_eb_bytes) |
| 308 | vol->used_ebs += 1; |
| 309 | else |
| 310 | vol->last_eb_bytes = vol->usable_leb_size; |
| 311 | } |
| 312 | |
| 313 | /* Register character device for the volume */ |
| 314 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); |
| 315 | vol->cdev.owner = THIS_MODULE; |
Artem Bityutskiy | 49dfc29 | 2007-12-15 18:13:56 +0200 | [diff] [blame] | 316 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
| 317 | err = cdev_add(&vol->cdev, dev, 1); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 318 | if (err) { |
Artem Bityutskiy | 01f7b30 | 2007-12-15 19:56:51 +0200 | [diff] [blame] | 319 | ubi_err("cannot add character device"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 320 | goto out_mapping; |
| 321 | } |
| 322 | |
| 323 | err = ubi_create_gluebi(ubi, vol); |
| 324 | if (err) |
| 325 | goto out_cdev; |
| 326 | |
| 327 | vol->dev.release = vol_release; |
| 328 | vol->dev.parent = &ubi->dev; |
Artem Bityutskiy | 49dfc29 | 2007-12-15 18:13:56 +0200 | [diff] [blame] | 329 | vol->dev.devt = dev; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 330 | vol->dev.class = ubi_class; |
Artem Bityutskiy | fc75a1e | 2007-12-17 14:02:09 +0200 | [diff] [blame] | 331 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 332 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); |
| 333 | err = device_register(&vol->dev); |
Artem Bityutskiy | 01f7b30 | 2007-12-15 19:56:51 +0200 | [diff] [blame] | 334 | if (err) { |
| 335 | ubi_err("cannot register device"); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 336 | goto out_gluebi; |
Artem Bityutskiy | 01f7b30 | 2007-12-15 19:56:51 +0200 | [diff] [blame] | 337 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 338 | |
| 339 | err = volume_sysfs_init(ubi, vol); |
| 340 | if (err) |
| 341 | goto out_sysfs; |
| 342 | |
| 343 | /* Fill volume table record */ |
| 344 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 345 | vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs); |
| 346 | vtbl_rec.alignment = cpu_to_be32(vol->alignment); |
| 347 | vtbl_rec.data_pad = cpu_to_be32(vol->data_pad); |
| 348 | vtbl_rec.name_len = cpu_to_be16(vol->name_len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 349 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
| 350 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; |
| 351 | else |
| 352 | vtbl_rec.vol_type = UBI_VID_STATIC; |
Artem Bityutskiy | a6ea440 | 2008-07-13 21:46:24 +0300 | [diff] [blame] | 353 | memcpy(vtbl_rec.name, vol->name, vol->name_len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 354 | |
| 355 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
| 356 | if (err) |
| 357 | goto out_sysfs; |
| 358 | |
| 359 | spin_lock(&ubi->volumes_lock); |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 360 | ubi->volumes[vol_id] = vol; |
Artem Bityutskiy | 4b3cc34 | 2007-12-26 15:59:39 +0200 | [diff] [blame] | 361 | ubi->vol_count += 1; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 362 | spin_unlock(&ubi->volumes_lock); |
| 363 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 364 | err = paranoid_check_volumes(ubi); |
| 365 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 366 | |
Artem Bityutskiy | fc75a1e | 2007-12-17 14:02:09 +0200 | [diff] [blame] | 367 | out_sysfs: |
| 368 | /* |
Artem Bityutskiy | abc5e92 | 2008-06-04 16:48:12 +0300 | [diff] [blame] | 369 | * We have registered our device, we should not free the volume |
Artem Bityutskiy | fc75a1e | 2007-12-17 14:02:09 +0200 | [diff] [blame] | 370 | * description object in this function in case of an error - it is |
| 371 | * freed by the release function. |
| 372 | * |
| 373 | * Get device reference to prevent the release function from being |
| 374 | * called just after sysfs has been closed. |
| 375 | */ |
Artem Bityutskiy | abc5e92 | 2008-06-04 16:48:12 +0300 | [diff] [blame] | 376 | do_free = 0; |
Artem Bityutskiy | fc75a1e | 2007-12-17 14:02:09 +0200 | [diff] [blame] | 377 | get_device(&vol->dev); |
| 378 | volume_sysfs_close(vol); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 379 | out_gluebi: |
S.Çağlar Onur | fc39876 | 2008-02-12 13:25:06 +0200 | [diff] [blame] | 380 | if (ubi_destroy_gluebi(vol)) |
| 381 | dbg_err("cannot destroy gluebi for volume %d:%d", |
| 382 | ubi->ubi_num, vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 383 | out_cdev: |
| 384 | cdev_del(&vol->cdev); |
| 385 | out_mapping: |
Artem Bityutskiy | abc5e92 | 2008-06-04 16:48:12 +0300 | [diff] [blame] | 386 | if (do_free) |
| 387 | kfree(vol->eba_tbl); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 388 | out_acc: |
| 389 | spin_lock(&ubi->volumes_lock); |
| 390 | ubi->rsvd_pebs -= vol->reserved_pebs; |
| 391 | ubi->avail_pebs += vol->reserved_pebs; |
| 392 | out_unlock: |
| 393 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | abc5e92 | 2008-06-04 16:48:12 +0300 | [diff] [blame] | 394 | if (do_free) |
Artem Bityutskiy | fc75a1e | 2007-12-17 14:02:09 +0200 | [diff] [blame] | 395 | kfree(vol); |
Artem Bityutskiy | abc5e92 | 2008-06-04 16:48:12 +0300 | [diff] [blame] | 396 | else |
| 397 | put_device(&vol->dev); |
Artem Bityutskiy | 01f7b30 | 2007-12-15 19:56:51 +0200 | [diff] [blame] | 398 | ubi_err("cannot create volume %d, error %d", vol_id, err); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 399 | return err; |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * ubi_remove_volume - remove volume. |
| 404 | * @desc: volume descriptor |
Artem Bityutskiy | f40ac9c | 2008-07-13 21:47:47 +0300 | [diff] [blame] | 405 | * @no_vtbl: do not change volume table if not zero |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 406 | * |
| 407 | * This function removes volume described by @desc. The volume has to be opened |
| 408 | * in "exclusive" mode. Returns zero in case of success and a negative error |
Artem Bityutskiy | 40e4d0c | 2007-12-17 17:08:55 +0200 | [diff] [blame] | 409 | * code in case of failure. The caller has to have the @ubi->volumes_mutex |
| 410 | * locked. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 411 | */ |
Artem Bityutskiy | f40ac9c | 2008-07-13 21:47:47 +0300 | [diff] [blame] | 412 | int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 413 | { |
| 414 | struct ubi_volume *vol = desc->vol; |
| 415 | struct ubi_device *ubi = vol->ubi; |
| 416 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; |
| 417 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 418 | dbg_gen("remove UBI volume %d", vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 419 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
| 420 | ubi_assert(vol == ubi->volumes[vol_id]); |
| 421 | |
| 422 | if (ubi->ro_mode) |
| 423 | return -EROFS; |
| 424 | |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 425 | spin_lock(&ubi->volumes_lock); |
| 426 | if (vol->ref_count > 1) { |
| 427 | /* |
| 428 | * The volume is busy, probably someone is reading one of its |
| 429 | * sysfs files. |
| 430 | */ |
| 431 | err = -EBUSY; |
| 432 | goto out_unlock; |
| 433 | } |
| 434 | ubi->volumes[vol_id] = NULL; |
| 435 | spin_unlock(&ubi->volumes_lock); |
| 436 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 437 | err = ubi_destroy_gluebi(vol); |
| 438 | if (err) |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 439 | goto out_err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 440 | |
Artem Bityutskiy | f40ac9c | 2008-07-13 21:47:47 +0300 | [diff] [blame] | 441 | if (!no_vtbl) { |
| 442 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); |
| 443 | if (err) |
| 444 | goto out_err; |
| 445 | } |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 446 | |
| 447 | for (i = 0; i < vol->reserved_pebs; i++) { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 448 | err = ubi_eba_unmap_leb(ubi, vol, i); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 449 | if (err) |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 450 | goto out_err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 451 | } |
| 452 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 453 | cdev_del(&vol->cdev); |
| 454 | volume_sysfs_close(vol); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 455 | |
| 456 | spin_lock(&ubi->volumes_lock); |
| 457 | ubi->rsvd_pebs -= reserved_pebs; |
| 458 | ubi->avail_pebs += reserved_pebs; |
| 459 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; |
| 460 | if (i > 0) { |
| 461 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; |
| 462 | ubi->avail_pebs -= i; |
| 463 | ubi->rsvd_pebs += i; |
| 464 | ubi->beb_rsvd_pebs += i; |
| 465 | if (i > 0) |
| 466 | ubi_msg("reserve more %d PEBs", i); |
| 467 | } |
| 468 | ubi->vol_count -= 1; |
| 469 | spin_unlock(&ubi->volumes_lock); |
| 470 | |
Artem Bityutskiy | f40ac9c | 2008-07-13 21:47:47 +0300 | [diff] [blame] | 471 | if (!no_vtbl) |
| 472 | err = paranoid_check_volumes(ubi); |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 473 | return err; |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 474 | |
| 475 | out_err: |
| 476 | ubi_err("cannot remove volume %d, error %d", vol_id, err); |
| 477 | spin_lock(&ubi->volumes_lock); |
| 478 | ubi->volumes[vol_id] = vol; |
| 479 | out_unlock: |
| 480 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | cae0a77 | 2007-12-17 12:46:48 +0200 | [diff] [blame] | 481 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 482 | } |
| 483 | |
| 484 | /** |
| 485 | * ubi_resize_volume - re-size volume. |
| 486 | * @desc: volume descriptor |
| 487 | * @reserved_pebs: new size in physical eraseblocks |
| 488 | * |
Artem Bityutskiy | 40e4d0c | 2007-12-17 17:08:55 +0200 | [diff] [blame] | 489 | * This function re-sizes the volume and returns zero in case of success, and a |
| 490 | * negative error code in case of failure. The caller has to have the |
| 491 | * @ubi->volumes_mutex locked. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 492 | */ |
| 493 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) |
| 494 | { |
| 495 | int i, err, pebs, *new_mapping; |
| 496 | struct ubi_volume *vol = desc->vol; |
| 497 | struct ubi_device *ubi = vol->ubi; |
| 498 | struct ubi_vtbl_record vtbl_rec; |
| 499 | int vol_id = vol->vol_id; |
| 500 | |
| 501 | if (ubi->ro_mode) |
| 502 | return -EROFS; |
| 503 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 504 | dbg_gen("re-size volume %d to from %d to %d PEBs", |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 505 | vol_id, vol->reserved_pebs, reserved_pebs); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 506 | |
| 507 | if (vol->vol_type == UBI_STATIC_VOLUME && |
| 508 | reserved_pebs < vol->used_ebs) { |
| 509 | dbg_err("too small size %d, %d LEBs contain data", |
| 510 | reserved_pebs, vol->used_ebs); |
| 511 | return -EINVAL; |
| 512 | } |
| 513 | |
| 514 | /* If the size is the same, we have nothing to do */ |
| 515 | if (reserved_pebs == vol->reserved_pebs) |
| 516 | return 0; |
| 517 | |
| 518 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); |
| 519 | if (!new_mapping) |
| 520 | return -ENOMEM; |
| 521 | |
| 522 | for (i = 0; i < reserved_pebs; i++) |
| 523 | new_mapping[i] = UBI_LEB_UNMAPPED; |
| 524 | |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 525 | spin_lock(&ubi->volumes_lock); |
| 526 | if (vol->ref_count > 1) { |
| 527 | spin_unlock(&ubi->volumes_lock); |
| 528 | err = -EBUSY; |
| 529 | goto out_free; |
| 530 | } |
| 531 | spin_unlock(&ubi->volumes_lock); |
| 532 | |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 533 | /* Reserve physical eraseblocks */ |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 534 | pebs = reserved_pebs - vol->reserved_pebs; |
| 535 | if (pebs > 0) { |
| 536 | spin_lock(&ubi->volumes_lock); |
| 537 | if (pebs > ubi->avail_pebs) { |
| 538 | dbg_err("not enough PEBs: requested %d, available %d", |
| 539 | pebs, ubi->avail_pebs); |
| 540 | spin_unlock(&ubi->volumes_lock); |
| 541 | err = -ENOSPC; |
| 542 | goto out_free; |
| 543 | } |
| 544 | ubi->avail_pebs -= pebs; |
| 545 | ubi->rsvd_pebs += pebs; |
| 546 | for (i = 0; i < vol->reserved_pebs; i++) |
| 547 | new_mapping[i] = vol->eba_tbl[i]; |
| 548 | kfree(vol->eba_tbl); |
| 549 | vol->eba_tbl = new_mapping; |
| 550 | spin_unlock(&ubi->volumes_lock); |
| 551 | } |
| 552 | |
| 553 | /* Change volume table record */ |
| 554 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 555 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 556 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
| 557 | if (err) |
| 558 | goto out_acc; |
| 559 | |
| 560 | if (pebs < 0) { |
| 561 | for (i = 0; i < -pebs; i++) { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 562 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 563 | if (err) |
| 564 | goto out_acc; |
| 565 | } |
| 566 | spin_lock(&ubi->volumes_lock); |
| 567 | ubi->rsvd_pebs += pebs; |
| 568 | ubi->avail_pebs -= pebs; |
| 569 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; |
| 570 | if (pebs > 0) { |
| 571 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; |
| 572 | ubi->avail_pebs -= pebs; |
| 573 | ubi->rsvd_pebs += pebs; |
| 574 | ubi->beb_rsvd_pebs += pebs; |
| 575 | if (pebs > 0) |
| 576 | ubi_msg("reserve more %d PEBs", pebs); |
| 577 | } |
| 578 | for (i = 0; i < reserved_pebs; i++) |
| 579 | new_mapping[i] = vol->eba_tbl[i]; |
| 580 | kfree(vol->eba_tbl); |
| 581 | vol->eba_tbl = new_mapping; |
| 582 | spin_unlock(&ubi->volumes_lock); |
| 583 | } |
| 584 | |
| 585 | vol->reserved_pebs = reserved_pebs; |
| 586 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
| 587 | vol->used_ebs = reserved_pebs; |
| 588 | vol->last_eb_bytes = vol->usable_leb_size; |
Vinit Agnihotri | d08c3b7 | 2007-07-10 13:04:59 +0300 | [diff] [blame] | 589 | vol->used_bytes = |
| 590 | (long long)vol->used_ebs * vol->usable_leb_size; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 591 | } |
| 592 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 593 | err = paranoid_check_volumes(ubi); |
| 594 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 595 | |
| 596 | out_acc: |
| 597 | if (pebs > 0) { |
| 598 | spin_lock(&ubi->volumes_lock); |
| 599 | ubi->rsvd_pebs -= pebs; |
| 600 | ubi->avail_pebs += pebs; |
| 601 | spin_unlock(&ubi->volumes_lock); |
| 602 | } |
| 603 | out_free: |
| 604 | kfree(new_mapping); |
| 605 | return err; |
| 606 | } |
| 607 | |
| 608 | /** |
Artem Bityutskiy | f40ac9c | 2008-07-13 21:47:47 +0300 | [diff] [blame] | 609 | * ubi_rename_volumes - re-name UBI volumes. |
| 610 | * @ubi: UBI device description object |
| 611 | * @renam_list: list of &struct ubi_rename_entry objects |
| 612 | * |
| 613 | * This function re-names or removes volumes specified in the re-name list. |
| 614 | * Returns zero in case of success and a negative error code in case of |
| 615 | * failure. |
| 616 | */ |
| 617 | int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list) |
| 618 | { |
| 619 | int err; |
| 620 | struct ubi_rename_entry *re; |
| 621 | |
| 622 | err = ubi_vtbl_rename_volumes(ubi, rename_list); |
| 623 | if (err) |
| 624 | return err; |
| 625 | |
| 626 | list_for_each_entry(re, rename_list, list) { |
| 627 | if (re->remove) { |
| 628 | err = ubi_remove_volume(re->desc, 1); |
| 629 | if (err) |
| 630 | break; |
| 631 | } else { |
| 632 | struct ubi_volume *vol = re->desc->vol; |
| 633 | |
| 634 | spin_lock(&ubi->volumes_lock); |
| 635 | vol->name_len = re->new_name_len; |
| 636 | memcpy(vol->name, re->new_name, re->new_name_len + 1); |
| 637 | spin_unlock(&ubi->volumes_lock); |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | if (!err) |
| 642 | paranoid_check_volumes(ubi); |
| 643 | return err; |
| 644 | } |
| 645 | |
| 646 | /** |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 647 | * ubi_add_volume - add volume. |
| 648 | * @ubi: UBI device description object |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 649 | * @vol: volume description object |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 650 | * |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 651 | * This function adds an existing volume and initializes all its data |
| 652 | * structures. Returns zero in case of success and a negative error code in |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 653 | * case of failure. |
| 654 | */ |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 655 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 656 | { |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 657 | int err, vol_id = vol->vol_id; |
Artem Bityutskiy | 49dfc29 | 2007-12-15 18:13:56 +0200 | [diff] [blame] | 658 | dev_t dev; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 659 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 660 | dbg_gen("add volume %d", vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 661 | |
| 662 | /* Register character device for the volume */ |
| 663 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); |
| 664 | vol->cdev.owner = THIS_MODULE; |
Artem Bityutskiy | 49dfc29 | 2007-12-15 18:13:56 +0200 | [diff] [blame] | 665 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
| 666 | err = cdev_add(&vol->cdev, dev, 1); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 667 | if (err) { |
Artem Bityutskiy | 01f7b30 | 2007-12-15 19:56:51 +0200 | [diff] [blame] | 668 | ubi_err("cannot add character device for volume %d, error %d", |
| 669 | vol_id, err); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 670 | return err; |
| 671 | } |
| 672 | |
| 673 | err = ubi_create_gluebi(ubi, vol); |
| 674 | if (err) |
| 675 | goto out_cdev; |
| 676 | |
| 677 | vol->dev.release = vol_release; |
| 678 | vol->dev.parent = &ubi->dev; |
Artem Bityutskiy | 49dfc29 | 2007-12-15 18:13:56 +0200 | [diff] [blame] | 679 | vol->dev.devt = dev; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 680 | vol->dev.class = ubi_class; |
| 681 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); |
| 682 | err = device_register(&vol->dev); |
| 683 | if (err) |
| 684 | goto out_gluebi; |
| 685 | |
| 686 | err = volume_sysfs_init(ubi, vol); |
| 687 | if (err) { |
| 688 | cdev_del(&vol->cdev); |
| 689 | err = ubi_destroy_gluebi(vol); |
| 690 | volume_sysfs_close(vol); |
| 691 | return err; |
| 692 | } |
| 693 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 694 | err = paranoid_check_volumes(ubi); |
| 695 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 696 | |
| 697 | out_gluebi: |
| 698 | err = ubi_destroy_gluebi(vol); |
| 699 | out_cdev: |
| 700 | cdev_del(&vol->cdev); |
| 701 | return err; |
| 702 | } |
| 703 | |
| 704 | /** |
| 705 | * ubi_free_volume - free volume. |
| 706 | * @ubi: UBI device description object |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 707 | * @vol: volume description object |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 708 | * |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 709 | * This function frees all resources for volume @vol but does not remove it. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 710 | * Used only when the UBI device is detached. |
| 711 | */ |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 712 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 713 | { |
| 714 | int err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 715 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 716 | dbg_gen("free volume %d", vol->vol_id); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 717 | |
Artem Bityutskiy | 89b96b6 | 2007-12-16 20:00:38 +0200 | [diff] [blame] | 718 | ubi->volumes[vol->vol_id] = NULL; |
Artem Bityutskiy | d05c77a | 2007-12-17 15:42:57 +0200 | [diff] [blame] | 719 | err = ubi_destroy_gluebi(vol); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 720 | cdev_del(&vol->cdev); |
| 721 | volume_sysfs_close(vol); |
| 722 | } |
| 723 | |
| 724 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
| 725 | |
| 726 | /** |
| 727 | * paranoid_check_volume - check volume information. |
| 728 | * @ubi: UBI device description object |
| 729 | * @vol_id: volume ID |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 730 | * |
| 731 | * Returns zero if volume is all right and a a negative error code if not. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 732 | */ |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 733 | static int paranoid_check_volume(struct ubi_device *ubi, int vol_id) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 734 | { |
| 735 | int idx = vol_id2idx(ubi, vol_id); |
| 736 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; |
Artem Bityutskiy | b89044b | 2007-06-18 16:29:30 +0300 | [diff] [blame] | 737 | const struct ubi_volume *vol; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 738 | long long n; |
| 739 | const char *name; |
| 740 | |
Artem Bityutskiy | b89044b | 2007-06-18 16:29:30 +0300 | [diff] [blame] | 741 | spin_lock(&ubi->volumes_lock); |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 742 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
Artem Bityutskiy | b89044b | 2007-06-18 16:29:30 +0300 | [diff] [blame] | 743 | vol = ubi->volumes[idx]; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 744 | |
| 745 | if (!vol) { |
| 746 | if (reserved_pebs) { |
| 747 | ubi_err("no volume info, but volume exists"); |
| 748 | goto fail; |
| 749 | } |
Artem Bityutskiy | b89044b | 2007-06-18 16:29:30 +0300 | [diff] [blame] | 750 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 751 | return 0; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || |
| 755 | vol->name_len < 0) { |
| 756 | ubi_err("negative values"); |
| 757 | goto fail; |
| 758 | } |
| 759 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { |
| 760 | ubi_err("bad alignment"); |
| 761 | goto fail; |
| 762 | } |
| 763 | |
Kyungmin Park | cadb40c | 2008-05-22 10:32:18 +0900 | [diff] [blame] | 764 | n = vol->alignment & (ubi->min_io_size - 1); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 765 | if (vol->alignment != 1 && n) { |
| 766 | ubi_err("alignment is not multiple of min I/O unit"); |
| 767 | goto fail; |
| 768 | } |
| 769 | |
| 770 | n = ubi->leb_size % vol->alignment; |
| 771 | if (vol->data_pad != n) { |
| 772 | ubi_err("bad data_pad, has to be %lld", n); |
| 773 | goto fail; |
| 774 | } |
| 775 | |
| 776 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && |
| 777 | vol->vol_type != UBI_STATIC_VOLUME) { |
| 778 | ubi_err("bad vol_type"); |
| 779 | goto fail; |
| 780 | } |
| 781 | |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 782 | if (vol->upd_marker && vol->corrupted) { |
| 783 | dbg_err("update marker and corrupted simultaneously"); |
| 784 | goto fail; |
| 785 | } |
| 786 | |
| 787 | if (vol->reserved_pebs > ubi->good_peb_count) { |
| 788 | ubi_err("too large reserved_pebs"); |
| 789 | goto fail; |
| 790 | } |
| 791 | |
| 792 | n = ubi->leb_size - vol->data_pad; |
| 793 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { |
| 794 | ubi_err("bad usable_leb_size, has to be %lld", n); |
| 795 | goto fail; |
| 796 | } |
| 797 | |
| 798 | if (vol->name_len > UBI_VOL_NAME_MAX) { |
| 799 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); |
| 800 | goto fail; |
| 801 | } |
| 802 | |
| 803 | if (!vol->name) { |
| 804 | ubi_err("NULL volume name"); |
| 805 | goto fail; |
| 806 | } |
| 807 | |
| 808 | n = strnlen(vol->name, vol->name_len + 1); |
| 809 | if (n != vol->name_len) { |
| 810 | ubi_err("bad name_len %lld", n); |
| 811 | goto fail; |
| 812 | } |
| 813 | |
Vinit Agnihotri | d08c3b7 | 2007-07-10 13:04:59 +0300 | [diff] [blame] | 814 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 815 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
Artem Bityutskiy | 896c0c0 | 2008-01-16 14:24:14 +0200 | [diff] [blame] | 816 | if (vol->corrupted) { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 817 | ubi_err("corrupted dynamic volume"); |
| 818 | goto fail; |
| 819 | } |
| 820 | if (vol->used_ebs != vol->reserved_pebs) { |
| 821 | ubi_err("bad used_ebs"); |
| 822 | goto fail; |
| 823 | } |
| 824 | if (vol->last_eb_bytes != vol->usable_leb_size) { |
| 825 | ubi_err("bad last_eb_bytes"); |
| 826 | goto fail; |
| 827 | } |
| 828 | if (vol->used_bytes != n) { |
| 829 | ubi_err("bad used_bytes"); |
| 830 | goto fail; |
| 831 | } |
| 832 | } else { |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 833 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { |
| 834 | ubi_err("bad used_ebs"); |
| 835 | goto fail; |
| 836 | } |
| 837 | if (vol->last_eb_bytes < 0 || |
| 838 | vol->last_eb_bytes > vol->usable_leb_size) { |
| 839 | ubi_err("bad last_eb_bytes"); |
| 840 | goto fail; |
| 841 | } |
| 842 | if (vol->used_bytes < 0 || vol->used_bytes > n || |
| 843 | vol->used_bytes < n - vol->usable_leb_size) { |
| 844 | ubi_err("bad used_bytes"); |
| 845 | goto fail; |
| 846 | } |
| 847 | } |
| 848 | |
Christoph Hellwig | 3261ebd | 2007-05-21 17:41:46 +0300 | [diff] [blame] | 849 | alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); |
| 850 | data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); |
| 851 | name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 852 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
| 853 | name = &ubi->vtbl[vol_id].name[0]; |
| 854 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) |
| 855 | vol_type = UBI_DYNAMIC_VOLUME; |
| 856 | else |
| 857 | vol_type = UBI_STATIC_VOLUME; |
| 858 | |
| 859 | if (alignment != vol->alignment || data_pad != vol->data_pad || |
| 860 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || |
| 861 | name_len!= vol->name_len || strncmp(name, vol->name, name_len)) { |
| 862 | ubi_err("volume info is different"); |
| 863 | goto fail; |
| 864 | } |
| 865 | |
Artem Bityutskiy | b89044b | 2007-06-18 16:29:30 +0300 | [diff] [blame] | 866 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 867 | return 0; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 868 | |
| 869 | fail: |
Artem Bityutskiy | 94784d9 | 2007-06-18 12:06:30 +0300 | [diff] [blame] | 870 | ubi_err("paranoid check failed for volume %d", vol_id); |
Artem Bityutskiy | f40ac9c | 2008-07-13 21:47:47 +0300 | [diff] [blame] | 871 | if (vol) |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 872 | ubi_dbg_dump_vol_info(vol); |
Artem Bityutskiy | f40ac9c | 2008-07-13 21:47:47 +0300 | [diff] [blame] | 873 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); |
Artem Bityutskiy | b89044b | 2007-06-18 16:29:30 +0300 | [diff] [blame] | 874 | spin_unlock(&ubi->volumes_lock); |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 875 | return -EINVAL; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 876 | } |
| 877 | |
| 878 | /** |
| 879 | * paranoid_check_volumes - check information about all volumes. |
| 880 | * @ubi: UBI device description object |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 881 | * |
| 882 | * Returns zero if volumes are all right and a a negative error code if not. |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 883 | */ |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 884 | static int paranoid_check_volumes(struct ubi_device *ubi) |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 885 | { |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 886 | int i, err = 0; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 887 | |
Artem Bityutskiy | c856635 | 2008-07-16 17:40:22 +0300 | [diff] [blame] | 888 | for (i = 0; i < ubi->vtbl_slots; i++) { |
| 889 | err = paranoid_check_volume(ubi, i); |
| 890 | if (err) |
| 891 | break; |
| 892 | } |
| 893 | |
| 894 | return err; |
Artem B. Bityutskiy | 801c135 | 2006-06-27 12:22:22 +0400 | [diff] [blame] | 895 | } |
| 896 | #endif |