Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Adrian Bunk | 2b9175c | 2005-11-29 14:49:38 +0000 | [diff] [blame] | 2 | * $Id: block2mtd.c,v 1.30 2005/11/29 14:48:32 gleixner Exp $ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * block2mtd.c - create an mtd from a block device |
| 5 | * |
| 6 | * Copyright (C) 2001,2002 Simon Evans <spse@secret.org.uk> |
David Woodhouse | 151e765 | 2006-05-14 01:51:54 +0100 | [diff] [blame] | 7 | * Copyright (C) 2004-2006 Jörn Engel <joern@wh.fh-wedel.de> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * Licence: GPL |
| 10 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/fs.h> |
| 13 | #include <linux/blkdev.h> |
| 14 | #include <linux/bio.h> |
| 15 | #include <linux/pagemap.h> |
| 16 | #include <linux/list.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/mtd/mtd.h> |
| 19 | #include <linux/buffer_head.h> |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 20 | #include <linux/mutex.h> |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 21 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Adrian Bunk | 2b9175c | 2005-11-29 14:49:38 +0000 | [diff] [blame] | 23 | #define VERSION "$Revision: 1.30 $" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | |
| 26 | #define ERROR(fmt, args...) printk(KERN_ERR "block2mtd: " fmt "\n" , ## args) |
| 27 | #define INFO(fmt, args...) printk(KERN_INFO "block2mtd: " fmt "\n" , ## args) |
| 28 | |
| 29 | |
| 30 | /* Info for the block device */ |
| 31 | struct block2mtd_dev { |
| 32 | struct list_head list; |
| 33 | struct block_device *blkdev; |
| 34 | struct mtd_info mtd; |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 35 | struct mutex write_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | }; |
| 37 | |
| 38 | |
| 39 | /* Static info about the MTD, used in cleanup_module */ |
| 40 | static LIST_HEAD(blkmtd_device_list); |
| 41 | |
| 42 | |
Joern Engel | 21d31f1 | 2007-02-20 20:22:22 +0100 | [diff] [blame] | 43 | static struct page* page_read(struct address_space *mapping, int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | { |
| 45 | filler_t *filler = (filler_t*)mapping->a_ops->readpage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | return read_cache_page(mapping, index, filler, NULL); |
| 47 | } |
| 48 | |
| 49 | |
| 50 | /* erase a specified part of the device */ |
| 51 | static int _block2mtd_erase(struct block2mtd_dev *dev, loff_t to, size_t len) |
| 52 | { |
| 53 | struct address_space *mapping = dev->blkdev->bd_inode->i_mapping; |
| 54 | struct page *page; |
| 55 | int index = to >> PAGE_SHIFT; // page index |
| 56 | int pages = len >> PAGE_SHIFT; |
| 57 | u_long *p; |
| 58 | u_long *max; |
| 59 | |
| 60 | while (pages) { |
Joern Engel | 21d31f1 | 2007-02-20 20:22:22 +0100 | [diff] [blame] | 61 | page = page_read(mapping, index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | if (!page) |
| 63 | return -ENOMEM; |
| 64 | if (IS_ERR(page)) |
| 65 | return PTR_ERR(page); |
| 66 | |
Joern Engel | 0ffb74c | 2007-02-20 20:20:58 +0100 | [diff] [blame] | 67 | max = page_address(page) + PAGE_SIZE; |
| 68 | for (p=page_address(page); p<max; p++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | if (*p != -1UL) { |
| 70 | lock_page(page); |
| 71 | memset(page_address(page), 0xff, PAGE_SIZE); |
| 72 | set_page_dirty(page); |
| 73 | unlock_page(page); |
| 74 | break; |
| 75 | } |
| 76 | |
| 77 | page_cache_release(page); |
| 78 | pages--; |
| 79 | index++; |
| 80 | } |
| 81 | return 0; |
| 82 | } |
| 83 | static int block2mtd_erase(struct mtd_info *mtd, struct erase_info *instr) |
| 84 | { |
| 85 | struct block2mtd_dev *dev = mtd->priv; |
| 86 | size_t from = instr->addr; |
| 87 | size_t len = instr->len; |
| 88 | int err; |
| 89 | |
| 90 | instr->state = MTD_ERASING; |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 91 | mutex_lock(&dev->write_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | err = _block2mtd_erase(dev, from, len); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 93 | mutex_unlock(&dev->write_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | if (err) { |
| 95 | ERROR("erase failed err = %d", err); |
| 96 | instr->state = MTD_ERASE_FAILED; |
| 97 | } else |
| 98 | instr->state = MTD_ERASE_DONE; |
| 99 | |
| 100 | instr->state = MTD_ERASE_DONE; |
| 101 | mtd_erase_callback(instr); |
| 102 | return err; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static int block2mtd_read(struct mtd_info *mtd, loff_t from, size_t len, |
| 107 | size_t *retlen, u_char *buf) |
| 108 | { |
| 109 | struct block2mtd_dev *dev = mtd->priv; |
| 110 | struct page *page; |
| 111 | int index = from >> PAGE_SHIFT; |
Joern Engel | 711c11b | 2005-03-07 20:29:09 +0000 | [diff] [blame] | 112 | int offset = from & (PAGE_SIZE-1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | int cpylen; |
| 114 | |
| 115 | if (from > mtd->size) |
| 116 | return -EINVAL; |
| 117 | if (from + len > mtd->size) |
| 118 | len = mtd->size - from; |
| 119 | |
| 120 | if (retlen) |
| 121 | *retlen = 0; |
| 122 | |
| 123 | while (len) { |
| 124 | if ((offset + len) > PAGE_SIZE) |
| 125 | cpylen = PAGE_SIZE - offset; // multiple pages |
| 126 | else |
| 127 | cpylen = len; // this page |
| 128 | len = len - cpylen; |
| 129 | |
Joern Engel | 21d31f1 | 2007-02-20 20:22:22 +0100 | [diff] [blame] | 130 | page = page_read(dev->blkdev->bd_inode->i_mapping, index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | if (!page) |
| 132 | return -ENOMEM; |
| 133 | if (IS_ERR(page)) |
| 134 | return PTR_ERR(page); |
| 135 | |
| 136 | memcpy(buf, page_address(page) + offset, cpylen); |
| 137 | page_cache_release(page); |
| 138 | |
| 139 | if (retlen) |
| 140 | *retlen += cpylen; |
| 141 | buf += cpylen; |
| 142 | offset = 0; |
| 143 | index++; |
| 144 | } |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | |
| 149 | /* write data to the underlying device */ |
| 150 | static int _block2mtd_write(struct block2mtd_dev *dev, const u_char *buf, |
| 151 | loff_t to, size_t len, size_t *retlen) |
| 152 | { |
| 153 | struct page *page; |
| 154 | struct address_space *mapping = dev->blkdev->bd_inode->i_mapping; |
| 155 | int index = to >> PAGE_SHIFT; // page index |
| 156 | int offset = to & ~PAGE_MASK; // page offset |
| 157 | int cpylen; |
| 158 | |
| 159 | if (retlen) |
| 160 | *retlen = 0; |
| 161 | while (len) { |
Thomas Gleixner | e5580fb | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 162 | if ((offset+len) > PAGE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | cpylen = PAGE_SIZE - offset; // multiple pages |
| 164 | else |
| 165 | cpylen = len; // this page |
| 166 | len = len - cpylen; |
| 167 | |
Joern Engel | 21d31f1 | 2007-02-20 20:22:22 +0100 | [diff] [blame] | 168 | page = page_read(mapping, index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | if (!page) |
| 170 | return -ENOMEM; |
| 171 | if (IS_ERR(page)) |
| 172 | return PTR_ERR(page); |
| 173 | |
| 174 | if (memcmp(page_address(page)+offset, buf, cpylen)) { |
| 175 | lock_page(page); |
| 176 | memcpy(page_address(page) + offset, buf, cpylen); |
| 177 | set_page_dirty(page); |
| 178 | unlock_page(page); |
| 179 | } |
| 180 | page_cache_release(page); |
| 181 | |
| 182 | if (retlen) |
| 183 | *retlen += cpylen; |
| 184 | |
| 185 | buf += cpylen; |
| 186 | offset = 0; |
| 187 | index++; |
| 188 | } |
| 189 | return 0; |
| 190 | } |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 191 | |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len, |
| 194 | size_t *retlen, const u_char *buf) |
| 195 | { |
| 196 | struct block2mtd_dev *dev = mtd->priv; |
| 197 | int err; |
| 198 | |
| 199 | if (!len) |
| 200 | return 0; |
| 201 | if (to >= mtd->size) |
| 202 | return -ENOSPC; |
| 203 | if (to + len > mtd->size) |
| 204 | len = mtd->size - to; |
| 205 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 206 | mutex_lock(&dev->write_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | err = _block2mtd_write(dev, buf, to, len, retlen); |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 208 | mutex_unlock(&dev->write_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | if (err > 0) |
| 210 | err = 0; |
| 211 | return err; |
| 212 | } |
| 213 | |
| 214 | |
| 215 | /* sync the device - wait until the write queue is empty */ |
| 216 | static void block2mtd_sync(struct mtd_info *mtd) |
| 217 | { |
| 218 | struct block2mtd_dev *dev = mtd->priv; |
| 219 | sync_blockdev(dev->blkdev); |
| 220 | return; |
| 221 | } |
| 222 | |
| 223 | |
| 224 | static void block2mtd_free_device(struct block2mtd_dev *dev) |
| 225 | { |
| 226 | if (!dev) |
| 227 | return; |
| 228 | |
| 229 | kfree(dev->mtd.name); |
| 230 | |
| 231 | if (dev->blkdev) { |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 232 | invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, |
| 233 | 0, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | close_bdev_excl(dev->blkdev); |
| 235 | } |
| 236 | |
| 237 | kfree(dev); |
| 238 | } |
| 239 | |
| 240 | |
| 241 | /* FIXME: ensure that mtd->size % erase_size == 0 */ |
| 242 | static struct block2mtd_dev *add_device(char *devname, int erase_size) |
| 243 | { |
| 244 | struct block_device *bdev; |
| 245 | struct block2mtd_dev *dev; |
| 246 | |
| 247 | if (!devname) |
| 248 | return NULL; |
| 249 | |
Burman Yan | 95b93a0 | 2006-11-15 21:10:29 +0200 | [diff] [blame] | 250 | dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | if (!dev) |
| 252 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | /* Get a handle on the device */ |
| 255 | bdev = open_bdev_excl(devname, O_RDWR, NULL); |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 256 | #ifndef MODULE |
| 257 | if (IS_ERR(bdev)) { |
| 258 | |
| 259 | /* We might not have rootfs mounted at this point. Try |
| 260 | to resolve the device name by other means. */ |
| 261 | |
Joern Engel | 8870530 | 2007-02-20 20:21:41 +0100 | [diff] [blame] | 262 | dev_t devt = name_to_dev_t(devname); |
| 263 | if (devt) { |
| 264 | bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ); |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 265 | } |
| 266 | } |
| 267 | #endif |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | if (IS_ERR(bdev)) { |
| 270 | ERROR("error: cannot open device %s", devname); |
| 271 | goto devinit_err; |
| 272 | } |
| 273 | dev->blkdev = bdev; |
| 274 | |
| 275 | if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) { |
| 276 | ERROR("attempting to use an MTD device as a block device"); |
| 277 | goto devinit_err; |
| 278 | } |
| 279 | |
Ingo Molnar | 48b1926 | 2006-03-31 02:29:41 -0800 | [diff] [blame] | 280 | mutex_init(&dev->write_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
| 282 | /* Setup the MTD structure */ |
| 283 | /* make the name contain the block device in */ |
| 284 | dev->mtd.name = kmalloc(sizeof("block2mtd: ") + strlen(devname), |
| 285 | GFP_KERNEL); |
| 286 | if (!dev->mtd.name) |
| 287 | goto devinit_err; |
| 288 | |
| 289 | sprintf(dev->mtd.name, "block2mtd: %s", devname); |
| 290 | |
| 291 | dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK; |
| 292 | dev->mtd.erasesize = erase_size; |
Artem B. Bityutskiy | 17ffc7b | 2006-06-22 18:15:48 +0400 | [diff] [blame] | 293 | dev->mtd.writesize = 1; |
David Woodhouse | 21c8db9 | 2006-06-14 21:39:48 +0100 | [diff] [blame] | 294 | dev->mtd.type = MTD_RAM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | dev->mtd.flags = MTD_CAP_RAM; |
| 296 | dev->mtd.erase = block2mtd_erase; |
| 297 | dev->mtd.write = block2mtd_write; |
| 298 | dev->mtd.writev = default_mtd_writev; |
| 299 | dev->mtd.sync = block2mtd_sync; |
| 300 | dev->mtd.read = block2mtd_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | dev->mtd.priv = dev; |
| 302 | dev->mtd.owner = THIS_MODULE; |
| 303 | |
| 304 | if (add_mtd_device(&dev->mtd)) { |
| 305 | /* Device didnt get added, so free the entry */ |
| 306 | goto devinit_err; |
| 307 | } |
| 308 | list_add(&dev->list, &blkmtd_device_list); |
| 309 | INFO("mtd%d: [%s] erase_size = %dKiB [%d]", dev->mtd.index, |
| 310 | dev->mtd.name + strlen("blkmtd: "), |
| 311 | dev->mtd.erasesize >> 10, dev->mtd.erasesize); |
| 312 | return dev; |
| 313 | |
| 314 | devinit_err: |
| 315 | block2mtd_free_device(dev); |
| 316 | return NULL; |
| 317 | } |
| 318 | |
| 319 | |
Joern Engel | 954c242 | 2006-04-18 21:03:08 -0700 | [diff] [blame] | 320 | /* This function works similar to reguler strtoul. In addition, it |
| 321 | * allows some suffixes for a more human-readable number format: |
| 322 | * ki, Ki, kiB, KiB - multiply result with 1024 |
| 323 | * Mi, MiB - multiply result with 1024^2 |
| 324 | * Gi, GiB - multiply result with 1024^3 |
| 325 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | static int ustrtoul(const char *cp, char **endp, unsigned int base) |
| 327 | { |
| 328 | unsigned long result = simple_strtoul(cp, endp, base); |
| 329 | switch (**endp) { |
| 330 | case 'G' : |
| 331 | result *= 1024; |
| 332 | case 'M': |
| 333 | result *= 1024; |
Joern Engel | 954c242 | 2006-04-18 21:03:08 -0700 | [diff] [blame] | 334 | case 'K': |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | case 'k': |
| 336 | result *= 1024; |
| 337 | /* By dwmw2 editorial decree, "ki", "Mi" or "Gi" are to be used. */ |
Joern Engel | 954c242 | 2006-04-18 21:03:08 -0700 | [diff] [blame] | 338 | if ((*endp)[1] == 'i') { |
| 339 | if ((*endp)[2] == 'B') |
| 340 | (*endp) += 3; |
| 341 | else |
| 342 | (*endp) += 2; |
| 343 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | } |
| 345 | return result; |
| 346 | } |
| 347 | |
| 348 | |
Thomas Gleixner | cc71229 | 2005-03-19 22:40:47 +0000 | [diff] [blame] | 349 | static int parse_num(size_t *num, const char *token) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
| 351 | char *endp; |
Thomas Gleixner | cc71229 | 2005-03-19 22:40:47 +0000 | [diff] [blame] | 352 | size_t n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Thomas Gleixner | cc71229 | 2005-03-19 22:40:47 +0000 | [diff] [blame] | 354 | n = (size_t) ustrtoul(token, &endp, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | if (*endp) |
| 356 | return -EINVAL; |
| 357 | |
Thomas Gleixner | cc71229 | 2005-03-19 22:40:47 +0000 | [diff] [blame] | 358 | *num = n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | static inline void kill_final_newline(char *str) |
| 364 | { |
| 365 | char *newline = strrchr(str, '\n'); |
| 366 | if (newline && !newline[1]) |
| 367 | *newline = 0; |
| 368 | } |
| 369 | |
| 370 | |
| 371 | #define parse_err(fmt, args...) do { \ |
| 372 | ERROR("block2mtd: " fmt "\n", ## args); \ |
| 373 | return 0; \ |
| 374 | } while (0) |
| 375 | |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 376 | #ifndef MODULE |
| 377 | static int block2mtd_init_called = 0; |
Adrian Bunk | 4839f04 | 2007-05-02 12:33:17 +0100 | [diff] [blame^] | 378 | static char block2mtd_paramline[80 + 12]; /* 80 for device, 12 for erase size */ |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 379 | #endif |
| 380 | |
| 381 | |
| 382 | static int block2mtd_setup2(const char *val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | { |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 384 | char buf[80 + 12]; /* 80 for device, 12 for erase size */ |
Jesper Juhl | a6550e5 | 2006-05-14 01:42:25 +0200 | [diff] [blame] | 385 | char *str = buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | char *token[2]; |
| 387 | char *name; |
Thomas Gleixner | cc71229 | 2005-03-19 22:40:47 +0000 | [diff] [blame] | 388 | size_t erase_size = PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | int i, ret; |
| 390 | |
| 391 | if (strnlen(val, sizeof(buf)) >= sizeof(buf)) |
| 392 | parse_err("parameter too long"); |
| 393 | |
| 394 | strcpy(str, val); |
| 395 | kill_final_newline(str); |
| 396 | |
Jesper Juhl | a6550e5 | 2006-05-14 01:42:25 +0200 | [diff] [blame] | 397 | for (i = 0; i < 2; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | token[i] = strsep(&str, ","); |
| 399 | |
| 400 | if (str) |
| 401 | parse_err("too many arguments"); |
| 402 | |
| 403 | if (!token[0]) |
| 404 | parse_err("no argument"); |
| 405 | |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 406 | name = token[0]; |
| 407 | if (strlen(name) + 1 > 80) |
| 408 | parse_err("device name too long"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
| 410 | if (token[1]) { |
Thomas Gleixner | cc71229 | 2005-03-19 22:40:47 +0000 | [diff] [blame] | 411 | ret = parse_num(&erase_size, token[1]); |
Jesper Juhl | a6550e5 | 2006-05-14 01:42:25 +0200 | [diff] [blame] | 412 | if (ret) { |
| 413 | kfree(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | parse_err("illegal erase size"); |
Jesper Juhl | a6550e5 | 2006-05-14 01:42:25 +0200 | [diff] [blame] | 415 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | add_device(name, erase_size); |
| 419 | |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 424 | static int block2mtd_setup(const char *val, struct kernel_param *kp) |
| 425 | { |
| 426 | #ifdef MODULE |
| 427 | return block2mtd_setup2(val); |
| 428 | #else |
| 429 | /* If more parameters are later passed in via |
| 430 | /sys/module/block2mtd/parameters/block2mtd |
| 431 | and block2mtd_init() has already been called, |
| 432 | we can parse the argument now. */ |
| 433 | |
| 434 | if (block2mtd_init_called) |
| 435 | return block2mtd_setup2(val); |
| 436 | |
| 437 | /* During early boot stage, we only save the parameters |
| 438 | here. We must parse them later: if the param passed |
| 439 | from kernel boot command line, block2mtd_setup() is |
| 440 | called so early that it is not possible to resolve |
| 441 | the device (even kmalloc() fails). Deter that work to |
| 442 | block2mtd_setup2(). */ |
| 443 | |
| 444 | strlcpy(block2mtd_paramline, val, sizeof(block2mtd_paramline)); |
| 445 | |
| 446 | return 0; |
| 447 | #endif |
| 448 | } |
| 449 | |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200); |
| 452 | MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\""); |
| 453 | |
| 454 | static int __init block2mtd_init(void) |
| 455 | { |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 456 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | INFO("version " VERSION); |
Ville Herva | c4e7fb3 | 2006-07-14 00:31:16 +0300 | [diff] [blame] | 458 | |
| 459 | #ifndef MODULE |
| 460 | if (strlen(block2mtd_paramline)) |
| 461 | ret = block2mtd_setup2(block2mtd_paramline); |
| 462 | block2mtd_init_called = 1; |
| 463 | #endif |
| 464 | |
| 465 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | |
| 469 | static void __devexit block2mtd_exit(void) |
| 470 | { |
| 471 | struct list_head *pos, *next; |
| 472 | |
| 473 | /* Remove the MTD devices */ |
| 474 | list_for_each_safe(pos, next, &blkmtd_device_list) { |
| 475 | struct block2mtd_dev *dev = list_entry(pos, typeof(*dev), list); |
| 476 | block2mtd_sync(&dev->mtd); |
| 477 | del_mtd_device(&dev->mtd); |
| 478 | INFO("mtd%d: [%s] removed", dev->mtd.index, |
| 479 | dev->mtd.name + strlen("blkmtd: ")); |
| 480 | list_del(&dev->list); |
| 481 | block2mtd_free_device(dev); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | |
| 486 | module_init(block2mtd_init); |
| 487 | module_exit(block2mtd_exit); |
| 488 | |
| 489 | MODULE_LICENSE("GPL"); |
| 490 | MODULE_AUTHOR("Simon Evans <spse@secret.org.uk> and others"); |
| 491 | MODULE_DESCRIPTION("Emulate an MTD using a block device"); |