| 1 | /* |
| 2 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
| 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 the |
| 12 | * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/fs.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/err.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/sched.h> |
| 29 | #include <linux/mutex.h> |
| 30 | #include <linux/backing-dev.h> |
| 31 | #include <linux/compat.h> |
| 32 | #include <linux/mount.h> |
| 33 | #include <linux/blkpg.h> |
| 34 | #include <linux/magic.h> |
| 35 | #include <linux/mtd/mtd.h> |
| 36 | #include <linux/mtd/partitions.h> |
| 37 | #include <linux/mtd/map.h> |
| 38 | |
| 39 | #include <asm/uaccess.h> |
| 40 | |
| 41 | #include "mtdcore.h" |
| 42 | |
| 43 | static DEFINE_MUTEX(mtd_mutex); |
| 44 | |
| 45 | /* |
| 46 | * Data structure to hold the pointer to the mtd device as well |
| 47 | * as mode information of various use cases. |
| 48 | */ |
| 49 | struct mtd_file_info { |
| 50 | struct mtd_info *mtd; |
| 51 | struct inode *ino; |
| 52 | enum mtd_file_modes mode; |
| 53 | }; |
| 54 | |
| 55 | static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) |
| 56 | { |
| 57 | struct mtd_file_info *mfi = file->private_data; |
| 58 | return fixed_size_llseek(file, offset, orig, mfi->mtd->size); |
| 59 | } |
| 60 | |
| 61 | static int count; |
| 62 | static struct vfsmount *mnt; |
| 63 | static struct file_system_type mtd_inodefs_type; |
| 64 | |
| 65 | static int mtdchar_open(struct inode *inode, struct file *file) |
| 66 | { |
| 67 | int minor = iminor(inode); |
| 68 | int devnum = minor >> 1; |
| 69 | int ret = 0; |
| 70 | struct mtd_info *mtd; |
| 71 | struct mtd_file_info *mfi; |
| 72 | struct inode *mtd_ino; |
| 73 | |
| 74 | pr_debug("MTD_open\n"); |
| 75 | |
| 76 | /* You can't open the RO devices RW */ |
| 77 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
| 78 | return -EACCES; |
| 79 | |
| 80 | ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count); |
| 81 | if (ret) |
| 82 | return ret; |
| 83 | |
| 84 | mutex_lock(&mtd_mutex); |
| 85 | mtd = get_mtd_device(NULL, devnum); |
| 86 | |
| 87 | if (IS_ERR(mtd)) { |
| 88 | ret = PTR_ERR(mtd); |
| 89 | goto out; |
| 90 | } |
| 91 | |
| 92 | if (mtd->type == MTD_ABSENT) { |
| 93 | ret = -ENODEV; |
| 94 | goto out1; |
| 95 | } |
| 96 | |
| 97 | mtd_ino = iget_locked(mnt->mnt_sb, devnum); |
| 98 | if (!mtd_ino) { |
| 99 | ret = -ENOMEM; |
| 100 | goto out1; |
| 101 | } |
| 102 | if (mtd_ino->i_state & I_NEW) { |
| 103 | mtd_ino->i_private = mtd; |
| 104 | mtd_ino->i_mode = S_IFCHR; |
| 105 | mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; |
| 106 | unlock_new_inode(mtd_ino); |
| 107 | } |
| 108 | file->f_mapping = mtd_ino->i_mapping; |
| 109 | |
| 110 | /* You can't open it RW if it's not a writeable device */ |
| 111 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
| 112 | ret = -EACCES; |
| 113 | goto out2; |
| 114 | } |
| 115 | |
| 116 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
| 117 | if (!mfi) { |
| 118 | ret = -ENOMEM; |
| 119 | goto out2; |
| 120 | } |
| 121 | mfi->ino = mtd_ino; |
| 122 | mfi->mtd = mtd; |
| 123 | file->private_data = mfi; |
| 124 | mutex_unlock(&mtd_mutex); |
| 125 | return 0; |
| 126 | |
| 127 | out2: |
| 128 | iput(mtd_ino); |
| 129 | out1: |
| 130 | put_mtd_device(mtd); |
| 131 | out: |
| 132 | mutex_unlock(&mtd_mutex); |
| 133 | simple_release_fs(&mnt, &count); |
| 134 | return ret; |
| 135 | } /* mtdchar_open */ |
| 136 | |
| 137 | /*====================================================================*/ |
| 138 | |
| 139 | static int mtdchar_close(struct inode *inode, struct file *file) |
| 140 | { |
| 141 | struct mtd_file_info *mfi = file->private_data; |
| 142 | struct mtd_info *mtd = mfi->mtd; |
| 143 | |
| 144 | pr_debug("MTD_close\n"); |
| 145 | |
| 146 | /* Only sync if opened RW */ |
| 147 | if ((file->f_mode & FMODE_WRITE)) |
| 148 | mtd_sync(mtd); |
| 149 | |
| 150 | iput(mfi->ino); |
| 151 | |
| 152 | put_mtd_device(mtd); |
| 153 | file->private_data = NULL; |
| 154 | kfree(mfi); |
| 155 | simple_release_fs(&mnt, &count); |
| 156 | |
| 157 | return 0; |
| 158 | } /* mtdchar_close */ |
| 159 | |
| 160 | /* Back in June 2001, dwmw2 wrote: |
| 161 | * |
| 162 | * FIXME: This _really_ needs to die. In 2.5, we should lock the |
| 163 | * userspace buffer down and use it directly with readv/writev. |
| 164 | * |
| 165 | * The implementation below, using mtd_kmalloc_up_to, mitigates |
| 166 | * allocation failures when the system is under low-memory situations |
| 167 | * or if memory is highly fragmented at the cost of reducing the |
| 168 | * performance of the requested transfer due to a smaller buffer size. |
| 169 | * |
| 170 | * A more complex but more memory-efficient implementation based on |
| 171 | * get_user_pages and iovecs to cover extents of those pages is a |
| 172 | * longer-term goal, as intimated by dwmw2 above. However, for the |
| 173 | * write case, this requires yet more complex head and tail transfer |
| 174 | * handling when those head and tail offsets and sizes are such that |
| 175 | * alignment requirements are not met in the NAND subdriver. |
| 176 | */ |
| 177 | |
| 178 | static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
| 179 | loff_t *ppos) |
| 180 | { |
| 181 | struct mtd_file_info *mfi = file->private_data; |
| 182 | struct mtd_info *mtd = mfi->mtd; |
| 183 | size_t retlen; |
| 184 | size_t total_retlen=0; |
| 185 | int ret=0; |
| 186 | int len; |
| 187 | size_t size = count; |
| 188 | char *kbuf; |
| 189 | |
| 190 | pr_debug("MTD_read\n"); |
| 191 | |
| 192 | if (*ppos + count > mtd->size) |
| 193 | count = mtd->size - *ppos; |
| 194 | |
| 195 | if (!count) |
| 196 | return 0; |
| 197 | |
| 198 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
| 199 | if (!kbuf) |
| 200 | return -ENOMEM; |
| 201 | |
| 202 | while (count) { |
| 203 | len = min_t(size_t, count, size); |
| 204 | |
| 205 | switch (mfi->mode) { |
| 206 | case MTD_FILE_MODE_OTP_FACTORY: |
| 207 | ret = mtd_read_fact_prot_reg(mtd, *ppos, len, |
| 208 | &retlen, kbuf); |
| 209 | break; |
| 210 | case MTD_FILE_MODE_OTP_USER: |
| 211 | ret = mtd_read_user_prot_reg(mtd, *ppos, len, |
| 212 | &retlen, kbuf); |
| 213 | break; |
| 214 | case MTD_FILE_MODE_RAW: |
| 215 | { |
| 216 | struct mtd_oob_ops ops; |
| 217 | |
| 218 | ops.mode = MTD_OPS_RAW; |
| 219 | ops.datbuf = kbuf; |
| 220 | ops.oobbuf = NULL; |
| 221 | ops.len = len; |
| 222 | |
| 223 | ret = mtd_read_oob(mtd, *ppos, &ops); |
| 224 | retlen = ops.retlen; |
| 225 | break; |
| 226 | } |
| 227 | default: |
| 228 | ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); |
| 229 | } |
| 230 | /* Nand returns -EBADMSG on ECC errors, but it returns |
| 231 | * the data. For our userspace tools it is important |
| 232 | * to dump areas with ECC errors! |
| 233 | * For kernel internal usage it also might return -EUCLEAN |
| 234 | * to signal the caller that a bitflip has occurred and has |
| 235 | * been corrected by the ECC algorithm. |
| 236 | * Userspace software which accesses NAND this way |
| 237 | * must be aware of the fact that it deals with NAND |
| 238 | */ |
| 239 | if (!ret || mtd_is_bitflip_or_eccerr(ret)) { |
| 240 | *ppos += retlen; |
| 241 | if (copy_to_user(buf, kbuf, retlen)) { |
| 242 | kfree(kbuf); |
| 243 | return -EFAULT; |
| 244 | } |
| 245 | else |
| 246 | total_retlen += retlen; |
| 247 | |
| 248 | count -= retlen; |
| 249 | buf += retlen; |
| 250 | if (retlen == 0) |
| 251 | count = 0; |
| 252 | } |
| 253 | else { |
| 254 | kfree(kbuf); |
| 255 | return ret; |
| 256 | } |
| 257 | |
| 258 | } |
| 259 | |
| 260 | kfree(kbuf); |
| 261 | return total_retlen; |
| 262 | } /* mtdchar_read */ |
| 263 | |
| 264 | static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
| 265 | loff_t *ppos) |
| 266 | { |
| 267 | struct mtd_file_info *mfi = file->private_data; |
| 268 | struct mtd_info *mtd = mfi->mtd; |
| 269 | size_t size = count; |
| 270 | char *kbuf; |
| 271 | size_t retlen; |
| 272 | size_t total_retlen=0; |
| 273 | int ret=0; |
| 274 | int len; |
| 275 | |
| 276 | pr_debug("MTD_write\n"); |
| 277 | |
| 278 | if (*ppos == mtd->size) |
| 279 | return -ENOSPC; |
| 280 | |
| 281 | if (*ppos + count > mtd->size) |
| 282 | count = mtd->size - *ppos; |
| 283 | |
| 284 | if (!count) |
| 285 | return 0; |
| 286 | |
| 287 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
| 288 | if (!kbuf) |
| 289 | return -ENOMEM; |
| 290 | |
| 291 | while (count) { |
| 292 | len = min_t(size_t, count, size); |
| 293 | |
| 294 | if (copy_from_user(kbuf, buf, len)) { |
| 295 | kfree(kbuf); |
| 296 | return -EFAULT; |
| 297 | } |
| 298 | |
| 299 | switch (mfi->mode) { |
| 300 | case MTD_FILE_MODE_OTP_FACTORY: |
| 301 | ret = -EROFS; |
| 302 | break; |
| 303 | case MTD_FILE_MODE_OTP_USER: |
| 304 | ret = mtd_write_user_prot_reg(mtd, *ppos, len, |
| 305 | &retlen, kbuf); |
| 306 | break; |
| 307 | |
| 308 | case MTD_FILE_MODE_RAW: |
| 309 | { |
| 310 | struct mtd_oob_ops ops; |
| 311 | |
| 312 | ops.mode = MTD_OPS_RAW; |
| 313 | ops.datbuf = kbuf; |
| 314 | ops.oobbuf = NULL; |
| 315 | ops.ooboffs = 0; |
| 316 | ops.len = len; |
| 317 | |
| 318 | ret = mtd_write_oob(mtd, *ppos, &ops); |
| 319 | retlen = ops.retlen; |
| 320 | break; |
| 321 | } |
| 322 | |
| 323 | default: |
| 324 | ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); |
| 325 | } |
| 326 | if (!ret) { |
| 327 | *ppos += retlen; |
| 328 | total_retlen += retlen; |
| 329 | count -= retlen; |
| 330 | buf += retlen; |
| 331 | } |
| 332 | else { |
| 333 | kfree(kbuf); |
| 334 | return ret; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | kfree(kbuf); |
| 339 | return total_retlen; |
| 340 | } /* mtdchar_write */ |
| 341 | |
| 342 | /*====================================================================== |
| 343 | |
| 344 | IOCTL calls for getting device parameters. |
| 345 | |
| 346 | ======================================================================*/ |
| 347 | static void mtdchar_erase_callback (struct erase_info *instr) |
| 348 | { |
| 349 | wake_up((wait_queue_head_t *)instr->priv); |
| 350 | } |
| 351 | |
| 352 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
| 353 | { |
| 354 | struct mtd_info *mtd = mfi->mtd; |
| 355 | size_t retlen; |
| 356 | |
| 357 | switch (mode) { |
| 358 | case MTD_OTP_FACTORY: |
| 359 | if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == |
| 360 | -EOPNOTSUPP) |
| 361 | return -EOPNOTSUPP; |
| 362 | |
| 363 | mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
| 364 | break; |
| 365 | case MTD_OTP_USER: |
| 366 | if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == |
| 367 | -EOPNOTSUPP) |
| 368 | return -EOPNOTSUPP; |
| 369 | |
| 370 | mfi->mode = MTD_FILE_MODE_OTP_USER; |
| 371 | break; |
| 372 | case MTD_OTP_OFF: |
| 373 | mfi->mode = MTD_FILE_MODE_NORMAL; |
| 374 | break; |
| 375 | default: |
| 376 | return -EINVAL; |
| 377 | } |
| 378 | |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, |
| 383 | uint64_t start, uint32_t length, void __user *ptr, |
| 384 | uint32_t __user *retp) |
| 385 | { |
| 386 | struct mtd_file_info *mfi = file->private_data; |
| 387 | struct mtd_oob_ops ops; |
| 388 | uint32_t retlen; |
| 389 | int ret = 0; |
| 390 | |
| 391 | if (!(file->f_mode & FMODE_WRITE)) |
| 392 | return -EPERM; |
| 393 | |
| 394 | if (length > 4096) |
| 395 | return -EINVAL; |
| 396 | |
| 397 | if (!mtd->_write_oob) |
| 398 | ret = -EOPNOTSUPP; |
| 399 | else |
| 400 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; |
| 401 | |
| 402 | if (ret) |
| 403 | return ret; |
| 404 | |
| 405 | ops.ooblen = length; |
| 406 | ops.ooboffs = start & (mtd->writesize - 1); |
| 407 | ops.datbuf = NULL; |
| 408 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
| 409 | MTD_OPS_PLACE_OOB; |
| 410 | |
| 411 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
| 412 | return -EINVAL; |
| 413 | |
| 414 | ops.oobbuf = memdup_user(ptr, length); |
| 415 | if (IS_ERR(ops.oobbuf)) |
| 416 | return PTR_ERR(ops.oobbuf); |
| 417 | |
| 418 | start &= ~((uint64_t)mtd->writesize - 1); |
| 419 | ret = mtd_write_oob(mtd, start, &ops); |
| 420 | |
| 421 | if (ops.oobretlen > 0xFFFFFFFFU) |
| 422 | ret = -EOVERFLOW; |
| 423 | retlen = ops.oobretlen; |
| 424 | if (copy_to_user(retp, &retlen, sizeof(length))) |
| 425 | ret = -EFAULT; |
| 426 | |
| 427 | kfree(ops.oobbuf); |
| 428 | return ret; |
| 429 | } |
| 430 | |
| 431 | static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
| 432 | uint64_t start, uint32_t length, void __user *ptr, |
| 433 | uint32_t __user *retp) |
| 434 | { |
| 435 | struct mtd_file_info *mfi = file->private_data; |
| 436 | struct mtd_oob_ops ops; |
| 437 | int ret = 0; |
| 438 | |
| 439 | if (length > 4096) |
| 440 | return -EINVAL; |
| 441 | |
| 442 | if (!access_ok(VERIFY_WRITE, ptr, length)) |
| 443 | return -EFAULT; |
| 444 | |
| 445 | ops.ooblen = length; |
| 446 | ops.ooboffs = start & (mtd->writesize - 1); |
| 447 | ops.datbuf = NULL; |
| 448 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
| 449 | MTD_OPS_PLACE_OOB; |
| 450 | |
| 451 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
| 452 | return -EINVAL; |
| 453 | |
| 454 | ops.oobbuf = kmalloc(length, GFP_KERNEL); |
| 455 | if (!ops.oobbuf) |
| 456 | return -ENOMEM; |
| 457 | |
| 458 | start &= ~((uint64_t)mtd->writesize - 1); |
| 459 | ret = mtd_read_oob(mtd, start, &ops); |
| 460 | |
| 461 | if (put_user(ops.oobretlen, retp)) |
| 462 | ret = -EFAULT; |
| 463 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, |
| 464 | ops.oobretlen)) |
| 465 | ret = -EFAULT; |
| 466 | |
| 467 | kfree(ops.oobbuf); |
| 468 | |
| 469 | /* |
| 470 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB |
| 471 | * data. For our userspace tools it is important to dump areas |
| 472 | * with ECC errors! |
| 473 | * For kernel internal usage it also might return -EUCLEAN |
| 474 | * to signal the caller that a bitflip has occured and has |
| 475 | * been corrected by the ECC algorithm. |
| 476 | * |
| 477 | * Note: currently the standard NAND function, nand_read_oob_std, |
| 478 | * does not calculate ECC for the OOB area, so do not rely on |
| 479 | * this behavior unless you have replaced it with your own. |
| 480 | */ |
| 481 | if (mtd_is_bitflip_or_eccerr(ret)) |
| 482 | return 0; |
| 483 | |
| 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * Copies (and truncates, if necessary) data from the larger struct, |
| 489 | * nand_ecclayout, to the smaller, deprecated layout struct, |
| 490 | * nand_ecclayout_user. This is necessary only to support the deprecated |
| 491 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use |
| 492 | * nand_ecclayout flexibly (i.e. the struct may change size in new |
| 493 | * releases without requiring major rewrites). |
| 494 | */ |
| 495 | static int shrink_ecclayout(const struct nand_ecclayout *from, |
| 496 | struct nand_ecclayout_user *to) |
| 497 | { |
| 498 | int i; |
| 499 | |
| 500 | if (!from || !to) |
| 501 | return -EINVAL; |
| 502 | |
| 503 | memset(to, 0, sizeof(*to)); |
| 504 | |
| 505 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
| 506 | for (i = 0; i < to->eccbytes; i++) |
| 507 | to->eccpos[i] = from->eccpos[i]; |
| 508 | |
| 509 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { |
| 510 | if (from->oobfree[i].length == 0 && |
| 511 | from->oobfree[i].offset == 0) |
| 512 | break; |
| 513 | to->oobavail += from->oobfree[i].length; |
| 514 | to->oobfree[i] = from->oobfree[i]; |
| 515 | } |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
| 521 | struct blkpg_ioctl_arg __user *arg) |
| 522 | { |
| 523 | struct blkpg_ioctl_arg a; |
| 524 | struct blkpg_partition p; |
| 525 | |
| 526 | if (!capable(CAP_SYS_ADMIN)) |
| 527 | return -EPERM; |
| 528 | |
| 529 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
| 530 | return -EFAULT; |
| 531 | |
| 532 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) |
| 533 | return -EFAULT; |
| 534 | |
| 535 | switch (a.op) { |
| 536 | case BLKPG_ADD_PARTITION: |
| 537 | |
| 538 | /* Only master mtd device must be used to add partitions */ |
| 539 | if (mtd_is_partition(mtd)) |
| 540 | return -EINVAL; |
| 541 | |
| 542 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
| 543 | |
| 544 | case BLKPG_DEL_PARTITION: |
| 545 | |
| 546 | if (p.pno < 0) |
| 547 | return -EINVAL; |
| 548 | |
| 549 | return mtd_del_partition(mtd, p.pno); |
| 550 | |
| 551 | default: |
| 552 | return -EINVAL; |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | static int mtdchar_write_ioctl(struct mtd_info *mtd, |
| 557 | struct mtd_write_req __user *argp) |
| 558 | { |
| 559 | struct mtd_write_req req; |
| 560 | struct mtd_oob_ops ops; |
| 561 | void __user *usr_data, *usr_oob; |
| 562 | int ret; |
| 563 | |
| 564 | if (copy_from_user(&req, argp, sizeof(req)) || |
| 565 | !access_ok(VERIFY_READ, req.usr_data, req.len) || |
| 566 | !access_ok(VERIFY_READ, req.usr_oob, req.ooblen)) |
| 567 | return -EFAULT; |
| 568 | if (!mtd->_write_oob) |
| 569 | return -EOPNOTSUPP; |
| 570 | |
| 571 | ops.mode = req.mode; |
| 572 | ops.len = (size_t)req.len; |
| 573 | ops.ooblen = (size_t)req.ooblen; |
| 574 | ops.ooboffs = 0; |
| 575 | |
| 576 | usr_data = (void __user *)(uintptr_t)req.usr_data; |
| 577 | usr_oob = (void __user *)(uintptr_t)req.usr_oob; |
| 578 | |
| 579 | if (req.usr_data) { |
| 580 | ops.datbuf = memdup_user(usr_data, ops.len); |
| 581 | if (IS_ERR(ops.datbuf)) |
| 582 | return PTR_ERR(ops.datbuf); |
| 583 | } else { |
| 584 | ops.datbuf = NULL; |
| 585 | } |
| 586 | |
| 587 | if (req.usr_oob) { |
| 588 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); |
| 589 | if (IS_ERR(ops.oobbuf)) { |
| 590 | kfree(ops.datbuf); |
| 591 | return PTR_ERR(ops.oobbuf); |
| 592 | } |
| 593 | } else { |
| 594 | ops.oobbuf = NULL; |
| 595 | } |
| 596 | |
| 597 | ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
| 598 | |
| 599 | kfree(ops.datbuf); |
| 600 | kfree(ops.oobbuf); |
| 601 | |
| 602 | return ret; |
| 603 | } |
| 604 | |
| 605 | static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
| 606 | { |
| 607 | struct mtd_file_info *mfi = file->private_data; |
| 608 | struct mtd_info *mtd = mfi->mtd; |
| 609 | void __user *argp = (void __user *)arg; |
| 610 | int ret = 0; |
| 611 | u_long size; |
| 612 | struct mtd_info_user info; |
| 613 | |
| 614 | pr_debug("MTD_ioctl\n"); |
| 615 | |
| 616 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; |
| 617 | if (cmd & IOC_IN) { |
| 618 | if (!access_ok(VERIFY_READ, argp, size)) |
| 619 | return -EFAULT; |
| 620 | } |
| 621 | if (cmd & IOC_OUT) { |
| 622 | if (!access_ok(VERIFY_WRITE, argp, size)) |
| 623 | return -EFAULT; |
| 624 | } |
| 625 | |
| 626 | switch (cmd) { |
| 627 | case MEMGETREGIONCOUNT: |
| 628 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) |
| 629 | return -EFAULT; |
| 630 | break; |
| 631 | |
| 632 | case MEMGETREGIONINFO: |
| 633 | { |
| 634 | uint32_t ur_idx; |
| 635 | struct mtd_erase_region_info *kr; |
| 636 | struct region_info_user __user *ur = argp; |
| 637 | |
| 638 | if (get_user(ur_idx, &(ur->regionindex))) |
| 639 | return -EFAULT; |
| 640 | |
| 641 | if (ur_idx >= mtd->numeraseregions) |
| 642 | return -EINVAL; |
| 643 | |
| 644 | kr = &(mtd->eraseregions[ur_idx]); |
| 645 | |
| 646 | if (put_user(kr->offset, &(ur->offset)) |
| 647 | || put_user(kr->erasesize, &(ur->erasesize)) |
| 648 | || put_user(kr->numblocks, &(ur->numblocks))) |
| 649 | return -EFAULT; |
| 650 | |
| 651 | break; |
| 652 | } |
| 653 | |
| 654 | case MEMGETINFO: |
| 655 | memset(&info, 0, sizeof(info)); |
| 656 | info.type = mtd->type; |
| 657 | info.flags = mtd->flags; |
| 658 | info.size = mtd->size; |
| 659 | info.erasesize = mtd->erasesize; |
| 660 | info.writesize = mtd->writesize; |
| 661 | info.oobsize = mtd->oobsize; |
| 662 | /* The below field is obsolete */ |
| 663 | info.padding = 0; |
| 664 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
| 665 | return -EFAULT; |
| 666 | break; |
| 667 | |
| 668 | case MEMERASE: |
| 669 | case MEMERASE64: |
| 670 | { |
| 671 | struct erase_info *erase; |
| 672 | |
| 673 | if(!(file->f_mode & FMODE_WRITE)) |
| 674 | return -EPERM; |
| 675 | |
| 676 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
| 677 | if (!erase) |
| 678 | ret = -ENOMEM; |
| 679 | else { |
| 680 | wait_queue_head_t waitq; |
| 681 | DECLARE_WAITQUEUE(wait, current); |
| 682 | |
| 683 | init_waitqueue_head(&waitq); |
| 684 | |
| 685 | if (cmd == MEMERASE64) { |
| 686 | struct erase_info_user64 einfo64; |
| 687 | |
| 688 | if (copy_from_user(&einfo64, argp, |
| 689 | sizeof(struct erase_info_user64))) { |
| 690 | kfree(erase); |
| 691 | return -EFAULT; |
| 692 | } |
| 693 | erase->addr = einfo64.start; |
| 694 | erase->len = einfo64.length; |
| 695 | } else { |
| 696 | struct erase_info_user einfo32; |
| 697 | |
| 698 | if (copy_from_user(&einfo32, argp, |
| 699 | sizeof(struct erase_info_user))) { |
| 700 | kfree(erase); |
| 701 | return -EFAULT; |
| 702 | } |
| 703 | erase->addr = einfo32.start; |
| 704 | erase->len = einfo32.length; |
| 705 | } |
| 706 | erase->mtd = mtd; |
| 707 | erase->callback = mtdchar_erase_callback; |
| 708 | erase->priv = (unsigned long)&waitq; |
| 709 | |
| 710 | /* |
| 711 | FIXME: Allow INTERRUPTIBLE. Which means |
| 712 | not having the wait_queue head on the stack. |
| 713 | |
| 714 | If the wq_head is on the stack, and we |
| 715 | leave because we got interrupted, then the |
| 716 | wq_head is no longer there when the |
| 717 | callback routine tries to wake us up. |
| 718 | */ |
| 719 | ret = mtd_erase(mtd, erase); |
| 720 | if (!ret) { |
| 721 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 722 | add_wait_queue(&waitq, &wait); |
| 723 | if (erase->state != MTD_ERASE_DONE && |
| 724 | erase->state != MTD_ERASE_FAILED) |
| 725 | schedule(); |
| 726 | remove_wait_queue(&waitq, &wait); |
| 727 | set_current_state(TASK_RUNNING); |
| 728 | |
| 729 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; |
| 730 | } |
| 731 | kfree(erase); |
| 732 | } |
| 733 | break; |
| 734 | } |
| 735 | |
| 736 | case MEMWRITEOOB: |
| 737 | { |
| 738 | struct mtd_oob_buf buf; |
| 739 | struct mtd_oob_buf __user *buf_user = argp; |
| 740 | |
| 741 | /* NOTE: writes return length to buf_user->length */ |
| 742 | if (copy_from_user(&buf, argp, sizeof(buf))) |
| 743 | ret = -EFAULT; |
| 744 | else |
| 745 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
| 746 | buf.ptr, &buf_user->length); |
| 747 | break; |
| 748 | } |
| 749 | |
| 750 | case MEMREADOOB: |
| 751 | { |
| 752 | struct mtd_oob_buf buf; |
| 753 | struct mtd_oob_buf __user *buf_user = argp; |
| 754 | |
| 755 | /* NOTE: writes return length to buf_user->start */ |
| 756 | if (copy_from_user(&buf, argp, sizeof(buf))) |
| 757 | ret = -EFAULT; |
| 758 | else |
| 759 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
| 760 | buf.ptr, &buf_user->start); |
| 761 | break; |
| 762 | } |
| 763 | |
| 764 | case MEMWRITEOOB64: |
| 765 | { |
| 766 | struct mtd_oob_buf64 buf; |
| 767 | struct mtd_oob_buf64 __user *buf_user = argp; |
| 768 | |
| 769 | if (copy_from_user(&buf, argp, sizeof(buf))) |
| 770 | ret = -EFAULT; |
| 771 | else |
| 772 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
| 773 | (void __user *)(uintptr_t)buf.usr_ptr, |
| 774 | &buf_user->length); |
| 775 | break; |
| 776 | } |
| 777 | |
| 778 | case MEMREADOOB64: |
| 779 | { |
| 780 | struct mtd_oob_buf64 buf; |
| 781 | struct mtd_oob_buf64 __user *buf_user = argp; |
| 782 | |
| 783 | if (copy_from_user(&buf, argp, sizeof(buf))) |
| 784 | ret = -EFAULT; |
| 785 | else |
| 786 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
| 787 | (void __user *)(uintptr_t)buf.usr_ptr, |
| 788 | &buf_user->length); |
| 789 | break; |
| 790 | } |
| 791 | |
| 792 | case MEMWRITE: |
| 793 | { |
| 794 | ret = mtdchar_write_ioctl(mtd, |
| 795 | (struct mtd_write_req __user *)arg); |
| 796 | break; |
| 797 | } |
| 798 | |
| 799 | case MEMLOCK: |
| 800 | { |
| 801 | struct erase_info_user einfo; |
| 802 | |
| 803 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
| 804 | return -EFAULT; |
| 805 | |
| 806 | ret = mtd_lock(mtd, einfo.start, einfo.length); |
| 807 | break; |
| 808 | } |
| 809 | |
| 810 | case MEMUNLOCK: |
| 811 | { |
| 812 | struct erase_info_user einfo; |
| 813 | |
| 814 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
| 815 | return -EFAULT; |
| 816 | |
| 817 | ret = mtd_unlock(mtd, einfo.start, einfo.length); |
| 818 | break; |
| 819 | } |
| 820 | |
| 821 | case MEMISLOCKED: |
| 822 | { |
| 823 | struct erase_info_user einfo; |
| 824 | |
| 825 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
| 826 | return -EFAULT; |
| 827 | |
| 828 | ret = mtd_is_locked(mtd, einfo.start, einfo.length); |
| 829 | break; |
| 830 | } |
| 831 | |
| 832 | /* Legacy interface */ |
| 833 | case MEMGETOOBSEL: |
| 834 | { |
| 835 | struct nand_oobinfo oi; |
| 836 | |
| 837 | if (!mtd->ecclayout) |
| 838 | return -EOPNOTSUPP; |
| 839 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) |
| 840 | return -EINVAL; |
| 841 | |
| 842 | oi.useecc = MTD_NANDECC_AUTOPLACE; |
| 843 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); |
| 844 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, |
| 845 | sizeof(oi.oobfree)); |
| 846 | oi.eccbytes = mtd->ecclayout->eccbytes; |
| 847 | |
| 848 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) |
| 849 | return -EFAULT; |
| 850 | break; |
| 851 | } |
| 852 | |
| 853 | case MEMGETBADBLOCK: |
| 854 | { |
| 855 | loff_t offs; |
| 856 | |
| 857 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
| 858 | return -EFAULT; |
| 859 | return mtd_block_isbad(mtd, offs); |
| 860 | break; |
| 861 | } |
| 862 | |
| 863 | case MEMSETBADBLOCK: |
| 864 | { |
| 865 | loff_t offs; |
| 866 | |
| 867 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
| 868 | return -EFAULT; |
| 869 | return mtd_block_markbad(mtd, offs); |
| 870 | break; |
| 871 | } |
| 872 | |
| 873 | case OTPSELECT: |
| 874 | { |
| 875 | int mode; |
| 876 | if (copy_from_user(&mode, argp, sizeof(int))) |
| 877 | return -EFAULT; |
| 878 | |
| 879 | mfi->mode = MTD_FILE_MODE_NORMAL; |
| 880 | |
| 881 | ret = otp_select_filemode(mfi, mode); |
| 882 | |
| 883 | file->f_pos = 0; |
| 884 | break; |
| 885 | } |
| 886 | |
| 887 | case OTPGETREGIONCOUNT: |
| 888 | case OTPGETREGIONINFO: |
| 889 | { |
| 890 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); |
| 891 | if (!buf) |
| 892 | return -ENOMEM; |
| 893 | switch (mfi->mode) { |
| 894 | case MTD_FILE_MODE_OTP_FACTORY: |
| 895 | ret = mtd_get_fact_prot_info(mtd, buf, 4096); |
| 896 | break; |
| 897 | case MTD_FILE_MODE_OTP_USER: |
| 898 | ret = mtd_get_user_prot_info(mtd, buf, 4096); |
| 899 | break; |
| 900 | default: |
| 901 | ret = -EINVAL; |
| 902 | break; |
| 903 | } |
| 904 | if (ret >= 0) { |
| 905 | if (cmd == OTPGETREGIONCOUNT) { |
| 906 | int nbr = ret / sizeof(struct otp_info); |
| 907 | ret = copy_to_user(argp, &nbr, sizeof(int)); |
| 908 | } else |
| 909 | ret = copy_to_user(argp, buf, ret); |
| 910 | if (ret) |
| 911 | ret = -EFAULT; |
| 912 | } |
| 913 | kfree(buf); |
| 914 | break; |
| 915 | } |
| 916 | |
| 917 | case OTPLOCK: |
| 918 | { |
| 919 | struct otp_info oinfo; |
| 920 | |
| 921 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
| 922 | return -EINVAL; |
| 923 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
| 924 | return -EFAULT; |
| 925 | ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
| 926 | break; |
| 927 | } |
| 928 | |
| 929 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
| 930 | case ECCGETLAYOUT: |
| 931 | { |
| 932 | struct nand_ecclayout_user *usrlay; |
| 933 | |
| 934 | if (!mtd->ecclayout) |
| 935 | return -EOPNOTSUPP; |
| 936 | |
| 937 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
| 938 | if (!usrlay) |
| 939 | return -ENOMEM; |
| 940 | |
| 941 | shrink_ecclayout(mtd->ecclayout, usrlay); |
| 942 | |
| 943 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) |
| 944 | ret = -EFAULT; |
| 945 | kfree(usrlay); |
| 946 | break; |
| 947 | } |
| 948 | |
| 949 | case ECCGETSTATS: |
| 950 | { |
| 951 | if (copy_to_user(argp, &mtd->ecc_stats, |
| 952 | sizeof(struct mtd_ecc_stats))) |
| 953 | return -EFAULT; |
| 954 | break; |
| 955 | } |
| 956 | |
| 957 | case MTDFILEMODE: |
| 958 | { |
| 959 | mfi->mode = 0; |
| 960 | |
| 961 | switch(arg) { |
| 962 | case MTD_FILE_MODE_OTP_FACTORY: |
| 963 | case MTD_FILE_MODE_OTP_USER: |
| 964 | ret = otp_select_filemode(mfi, arg); |
| 965 | break; |
| 966 | |
| 967 | case MTD_FILE_MODE_RAW: |
| 968 | if (!mtd_has_oob(mtd)) |
| 969 | return -EOPNOTSUPP; |
| 970 | mfi->mode = arg; |
| 971 | |
| 972 | case MTD_FILE_MODE_NORMAL: |
| 973 | break; |
| 974 | default: |
| 975 | ret = -EINVAL; |
| 976 | } |
| 977 | file->f_pos = 0; |
| 978 | break; |
| 979 | } |
| 980 | |
| 981 | case BLKPG: |
| 982 | { |
| 983 | ret = mtdchar_blkpg_ioctl(mtd, |
| 984 | (struct blkpg_ioctl_arg __user *)arg); |
| 985 | break; |
| 986 | } |
| 987 | |
| 988 | case BLKRRPART: |
| 989 | { |
| 990 | /* No reread partition feature. Just return ok */ |
| 991 | ret = 0; |
| 992 | break; |
| 993 | } |
| 994 | |
| 995 | default: |
| 996 | ret = -ENOTTY; |
| 997 | } |
| 998 | |
| 999 | return ret; |
| 1000 | } /* memory_ioctl */ |
| 1001 | |
| 1002 | static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
| 1003 | { |
| 1004 | int ret; |
| 1005 | |
| 1006 | mutex_lock(&mtd_mutex); |
| 1007 | ret = mtdchar_ioctl(file, cmd, arg); |
| 1008 | mutex_unlock(&mtd_mutex); |
| 1009 | |
| 1010 | return ret; |
| 1011 | } |
| 1012 | |
| 1013 | #ifdef CONFIG_COMPAT |
| 1014 | |
| 1015 | struct mtd_oob_buf32 { |
| 1016 | u_int32_t start; |
| 1017 | u_int32_t length; |
| 1018 | compat_caddr_t ptr; /* unsigned char* */ |
| 1019 | }; |
| 1020 | |
| 1021 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) |
| 1022 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) |
| 1023 | |
| 1024 | static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, |
| 1025 | unsigned long arg) |
| 1026 | { |
| 1027 | struct mtd_file_info *mfi = file->private_data; |
| 1028 | struct mtd_info *mtd = mfi->mtd; |
| 1029 | void __user *argp = compat_ptr(arg); |
| 1030 | int ret = 0; |
| 1031 | |
| 1032 | mutex_lock(&mtd_mutex); |
| 1033 | |
| 1034 | switch (cmd) { |
| 1035 | case MEMWRITEOOB32: |
| 1036 | { |
| 1037 | struct mtd_oob_buf32 buf; |
| 1038 | struct mtd_oob_buf32 __user *buf_user = argp; |
| 1039 | |
| 1040 | if (copy_from_user(&buf, argp, sizeof(buf))) |
| 1041 | ret = -EFAULT; |
| 1042 | else |
| 1043 | ret = mtdchar_writeoob(file, mtd, buf.start, |
| 1044 | buf.length, compat_ptr(buf.ptr), |
| 1045 | &buf_user->length); |
| 1046 | break; |
| 1047 | } |
| 1048 | |
| 1049 | case MEMREADOOB32: |
| 1050 | { |
| 1051 | struct mtd_oob_buf32 buf; |
| 1052 | struct mtd_oob_buf32 __user *buf_user = argp; |
| 1053 | |
| 1054 | /* NOTE: writes return length to buf->start */ |
| 1055 | if (copy_from_user(&buf, argp, sizeof(buf))) |
| 1056 | ret = -EFAULT; |
| 1057 | else |
| 1058 | ret = mtdchar_readoob(file, mtd, buf.start, |
| 1059 | buf.length, compat_ptr(buf.ptr), |
| 1060 | &buf_user->start); |
| 1061 | break; |
| 1062 | } |
| 1063 | default: |
| 1064 | ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); |
| 1065 | } |
| 1066 | |
| 1067 | mutex_unlock(&mtd_mutex); |
| 1068 | |
| 1069 | return ret; |
| 1070 | } |
| 1071 | |
| 1072 | #endif /* CONFIG_COMPAT */ |
| 1073 | |
| 1074 | /* |
| 1075 | * try to determine where a shared mapping can be made |
| 1076 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private |
| 1077 | * mappings) |
| 1078 | */ |
| 1079 | #ifndef CONFIG_MMU |
| 1080 | static unsigned long mtdchar_get_unmapped_area(struct file *file, |
| 1081 | unsigned long addr, |
| 1082 | unsigned long len, |
| 1083 | unsigned long pgoff, |
| 1084 | unsigned long flags) |
| 1085 | { |
| 1086 | struct mtd_file_info *mfi = file->private_data; |
| 1087 | struct mtd_info *mtd = mfi->mtd; |
| 1088 | unsigned long offset; |
| 1089 | int ret; |
| 1090 | |
| 1091 | if (addr != 0) |
| 1092 | return (unsigned long) -EINVAL; |
| 1093 | |
| 1094 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) |
| 1095 | return (unsigned long) -EINVAL; |
| 1096 | |
| 1097 | offset = pgoff << PAGE_SHIFT; |
| 1098 | if (offset > mtd->size - len) |
| 1099 | return (unsigned long) -EINVAL; |
| 1100 | |
| 1101 | ret = mtd_get_unmapped_area(mtd, len, offset, flags); |
| 1102 | return ret == -EOPNOTSUPP ? -ENOSYS : ret; |
| 1103 | } |
| 1104 | #endif |
| 1105 | |
| 1106 | /* |
| 1107 | * set up a mapping for shared memory segments |
| 1108 | */ |
| 1109 | static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) |
| 1110 | { |
| 1111 | #ifdef CONFIG_MMU |
| 1112 | struct mtd_file_info *mfi = file->private_data; |
| 1113 | struct mtd_info *mtd = mfi->mtd; |
| 1114 | struct map_info *map = mtd->priv; |
| 1115 | |
| 1116 | /* This is broken because it assumes the MTD device is map-based |
| 1117 | and that mtd->priv is a valid struct map_info. It should be |
| 1118 | replaced with something that uses the mtd_get_unmapped_area() |
| 1119 | operation properly. */ |
| 1120 | if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { |
| 1121 | #ifdef pgprot_noncached |
| 1122 | if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) |
| 1123 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
| 1124 | #endif |
| 1125 | return vm_iomap_memory(vma, map->phys, map->size); |
| 1126 | } |
| 1127 | return -ENOSYS; |
| 1128 | #else |
| 1129 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; |
| 1130 | #endif |
| 1131 | } |
| 1132 | |
| 1133 | static const struct file_operations mtd_fops = { |
| 1134 | .owner = THIS_MODULE, |
| 1135 | .llseek = mtdchar_lseek, |
| 1136 | .read = mtdchar_read, |
| 1137 | .write = mtdchar_write, |
| 1138 | .unlocked_ioctl = mtdchar_unlocked_ioctl, |
| 1139 | #ifdef CONFIG_COMPAT |
| 1140 | .compat_ioctl = mtdchar_compat_ioctl, |
| 1141 | #endif |
| 1142 | .open = mtdchar_open, |
| 1143 | .release = mtdchar_close, |
| 1144 | .mmap = mtdchar_mmap, |
| 1145 | #ifndef CONFIG_MMU |
| 1146 | .get_unmapped_area = mtdchar_get_unmapped_area, |
| 1147 | #endif |
| 1148 | }; |
| 1149 | |
| 1150 | static const struct super_operations mtd_ops = { |
| 1151 | .drop_inode = generic_delete_inode, |
| 1152 | .statfs = simple_statfs, |
| 1153 | }; |
| 1154 | |
| 1155 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
| 1156 | int flags, const char *dev_name, void *data) |
| 1157 | { |
| 1158 | return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC); |
| 1159 | } |
| 1160 | |
| 1161 | static struct file_system_type mtd_inodefs_type = { |
| 1162 | .name = "mtd_inodefs", |
| 1163 | .mount = mtd_inodefs_mount, |
| 1164 | .kill_sb = kill_anon_super, |
| 1165 | }; |
| 1166 | MODULE_ALIAS_FS("mtd_inodefs"); |
| 1167 | |
| 1168 | int __init init_mtdchar(void) |
| 1169 | { |
| 1170 | int ret; |
| 1171 | |
| 1172 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
| 1173 | "mtd", &mtd_fops); |
| 1174 | if (ret < 0) { |
| 1175 | pr_err("Can't allocate major number %d for MTD\n", |
| 1176 | MTD_CHAR_MAJOR); |
| 1177 | return ret; |
| 1178 | } |
| 1179 | |
| 1180 | ret = register_filesystem(&mtd_inodefs_type); |
| 1181 | if (ret) { |
| 1182 | pr_err("Can't register mtd_inodefs filesystem, error %d\n", |
| 1183 | ret); |
| 1184 | goto err_unregister_chdev; |
| 1185 | } |
| 1186 | |
| 1187 | return ret; |
| 1188 | |
| 1189 | err_unregister_chdev: |
| 1190 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
| 1191 | return ret; |
| 1192 | } |
| 1193 | |
| 1194 | void __exit cleanup_mtdchar(void) |
| 1195 | { |
| 1196 | unregister_filesystem(&mtd_inodefs_type); |
| 1197 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
| 1198 | } |
| 1199 | |
| 1200 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |