| 1 | /* |
| 2 | * linux/fs/read_write.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | */ |
| 6 | |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/stat.h> |
| 9 | #include <linux/fcntl.h> |
| 10 | #include <linux/file.h> |
| 11 | #include <linux/uio.h> |
| 12 | #include <linux/aio.h> |
| 13 | #include <linux/fsnotify.h> |
| 14 | #include <linux/security.h> |
| 15 | #include <linux/export.h> |
| 16 | #include <linux/syscalls.h> |
| 17 | #include <linux/pagemap.h> |
| 18 | #include <linux/splice.h> |
| 19 | #include <linux/compat.h> |
| 20 | #include "internal.h" |
| 21 | |
| 22 | #include <asm/uaccess.h> |
| 23 | #include <asm/unistd.h> |
| 24 | |
| 25 | typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); |
| 26 | typedef ssize_t (*iov_fn_t)(struct kiocb *, const struct iovec *, |
| 27 | unsigned long, loff_t); |
| 28 | |
| 29 | const struct file_operations generic_ro_fops = { |
| 30 | .llseek = generic_file_llseek, |
| 31 | .read = do_sync_read, |
| 32 | .aio_read = generic_file_aio_read, |
| 33 | .mmap = generic_file_readonly_mmap, |
| 34 | .splice_read = generic_file_splice_read, |
| 35 | }; |
| 36 | |
| 37 | EXPORT_SYMBOL(generic_ro_fops); |
| 38 | |
| 39 | static inline int unsigned_offsets(struct file *file) |
| 40 | { |
| 41 | return file->f_mode & FMODE_UNSIGNED_OFFSET; |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * vfs_setpos - update the file offset for lseek |
| 46 | * @file: file structure in question |
| 47 | * @offset: file offset to seek to |
| 48 | * @maxsize: maximum file size |
| 49 | * |
| 50 | * This is a low-level filesystem helper for updating the file offset to |
| 51 | * the value specified by @offset if the given offset is valid and it is |
| 52 | * not equal to the current file offset. |
| 53 | * |
| 54 | * Return the specified offset on success and -EINVAL on invalid offset. |
| 55 | */ |
| 56 | loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) |
| 57 | { |
| 58 | if (offset < 0 && !unsigned_offsets(file)) |
| 59 | return -EINVAL; |
| 60 | if (offset > maxsize) |
| 61 | return -EINVAL; |
| 62 | |
| 63 | if (offset != file->f_pos) { |
| 64 | file->f_pos = offset; |
| 65 | file->f_version = 0; |
| 66 | } |
| 67 | return offset; |
| 68 | } |
| 69 | EXPORT_SYMBOL(vfs_setpos); |
| 70 | |
| 71 | /** |
| 72 | * generic_file_llseek_size - generic llseek implementation for regular files |
| 73 | * @file: file structure to seek on |
| 74 | * @offset: file offset to seek to |
| 75 | * @whence: type of seek |
| 76 | * @size: max size of this file in file system |
| 77 | * @eof: offset used for SEEK_END position |
| 78 | * |
| 79 | * This is a variant of generic_file_llseek that allows passing in a custom |
| 80 | * maximum file size and a custom EOF position, for e.g. hashed directories |
| 81 | * |
| 82 | * Synchronization: |
| 83 | * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) |
| 84 | * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. |
| 85 | * read/writes behave like SEEK_SET against seeks. |
| 86 | */ |
| 87 | loff_t |
| 88 | generic_file_llseek_size(struct file *file, loff_t offset, int whence, |
| 89 | loff_t maxsize, loff_t eof) |
| 90 | { |
| 91 | switch (whence) { |
| 92 | case SEEK_END: |
| 93 | offset += eof; |
| 94 | break; |
| 95 | case SEEK_CUR: |
| 96 | /* |
| 97 | * Here we special-case the lseek(fd, 0, SEEK_CUR) |
| 98 | * position-querying operation. Avoid rewriting the "same" |
| 99 | * f_pos value back to the file because a concurrent read(), |
| 100 | * write() or lseek() might have altered it |
| 101 | */ |
| 102 | if (offset == 0) |
| 103 | return file->f_pos; |
| 104 | /* |
| 105 | * f_lock protects against read/modify/write race with other |
| 106 | * SEEK_CURs. Note that parallel writes and reads behave |
| 107 | * like SEEK_SET. |
| 108 | */ |
| 109 | spin_lock(&file->f_lock); |
| 110 | offset = vfs_setpos(file, file->f_pos + offset, maxsize); |
| 111 | spin_unlock(&file->f_lock); |
| 112 | return offset; |
| 113 | case SEEK_DATA: |
| 114 | /* |
| 115 | * In the generic case the entire file is data, so as long as |
| 116 | * offset isn't at the end of the file then the offset is data. |
| 117 | */ |
| 118 | if (offset >= eof) |
| 119 | return -ENXIO; |
| 120 | break; |
| 121 | case SEEK_HOLE: |
| 122 | /* |
| 123 | * There is a virtual hole at the end of the file, so as long as |
| 124 | * offset isn't i_size or larger, return i_size. |
| 125 | */ |
| 126 | if (offset >= eof) |
| 127 | return -ENXIO; |
| 128 | offset = eof; |
| 129 | break; |
| 130 | } |
| 131 | |
| 132 | return vfs_setpos(file, offset, maxsize); |
| 133 | } |
| 134 | EXPORT_SYMBOL(generic_file_llseek_size); |
| 135 | |
| 136 | /** |
| 137 | * generic_file_llseek - generic llseek implementation for regular files |
| 138 | * @file: file structure to seek on |
| 139 | * @offset: file offset to seek to |
| 140 | * @whence: type of seek |
| 141 | * |
| 142 | * This is a generic implemenation of ->llseek useable for all normal local |
| 143 | * filesystems. It just updates the file offset to the value specified by |
| 144 | * @offset and @whence. |
| 145 | */ |
| 146 | loff_t generic_file_llseek(struct file *file, loff_t offset, int whence) |
| 147 | { |
| 148 | struct inode *inode = file->f_mapping->host; |
| 149 | |
| 150 | return generic_file_llseek_size(file, offset, whence, |
| 151 | inode->i_sb->s_maxbytes, |
| 152 | i_size_read(inode)); |
| 153 | } |
| 154 | EXPORT_SYMBOL(generic_file_llseek); |
| 155 | |
| 156 | /** |
| 157 | * fixed_size_llseek - llseek implementation for fixed-sized devices |
| 158 | * @file: file structure to seek on |
| 159 | * @offset: file offset to seek to |
| 160 | * @whence: type of seek |
| 161 | * @size: size of the file |
| 162 | * |
| 163 | */ |
| 164 | loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size) |
| 165 | { |
| 166 | switch (whence) { |
| 167 | case SEEK_SET: case SEEK_CUR: case SEEK_END: |
| 168 | return generic_file_llseek_size(file, offset, whence, |
| 169 | size, size); |
| 170 | default: |
| 171 | return -EINVAL; |
| 172 | } |
| 173 | } |
| 174 | EXPORT_SYMBOL(fixed_size_llseek); |
| 175 | |
| 176 | /** |
| 177 | * noop_llseek - No Operation Performed llseek implementation |
| 178 | * @file: file structure to seek on |
| 179 | * @offset: file offset to seek to |
| 180 | * @whence: type of seek |
| 181 | * |
| 182 | * This is an implementation of ->llseek useable for the rare special case when |
| 183 | * userspace expects the seek to succeed but the (device) file is actually not |
| 184 | * able to perform the seek. In this case you use noop_llseek() instead of |
| 185 | * falling back to the default implementation of ->llseek. |
| 186 | */ |
| 187 | loff_t noop_llseek(struct file *file, loff_t offset, int whence) |
| 188 | { |
| 189 | return file->f_pos; |
| 190 | } |
| 191 | EXPORT_SYMBOL(noop_llseek); |
| 192 | |
| 193 | loff_t no_llseek(struct file *file, loff_t offset, int whence) |
| 194 | { |
| 195 | return -ESPIPE; |
| 196 | } |
| 197 | EXPORT_SYMBOL(no_llseek); |
| 198 | |
| 199 | loff_t default_llseek(struct file *file, loff_t offset, int whence) |
| 200 | { |
| 201 | struct inode *inode = file_inode(file); |
| 202 | loff_t retval; |
| 203 | |
| 204 | mutex_lock(&inode->i_mutex); |
| 205 | switch (whence) { |
| 206 | case SEEK_END: |
| 207 | offset += i_size_read(inode); |
| 208 | break; |
| 209 | case SEEK_CUR: |
| 210 | if (offset == 0) { |
| 211 | retval = file->f_pos; |
| 212 | goto out; |
| 213 | } |
| 214 | offset += file->f_pos; |
| 215 | break; |
| 216 | case SEEK_DATA: |
| 217 | /* |
| 218 | * In the generic case the entire file is data, so as |
| 219 | * long as offset isn't at the end of the file then the |
| 220 | * offset is data. |
| 221 | */ |
| 222 | if (offset >= inode->i_size) { |
| 223 | retval = -ENXIO; |
| 224 | goto out; |
| 225 | } |
| 226 | break; |
| 227 | case SEEK_HOLE: |
| 228 | /* |
| 229 | * There is a virtual hole at the end of the file, so |
| 230 | * as long as offset isn't i_size or larger, return |
| 231 | * i_size. |
| 232 | */ |
| 233 | if (offset >= inode->i_size) { |
| 234 | retval = -ENXIO; |
| 235 | goto out; |
| 236 | } |
| 237 | offset = inode->i_size; |
| 238 | break; |
| 239 | } |
| 240 | retval = -EINVAL; |
| 241 | if (offset >= 0 || unsigned_offsets(file)) { |
| 242 | if (offset != file->f_pos) { |
| 243 | file->f_pos = offset; |
| 244 | file->f_version = 0; |
| 245 | } |
| 246 | retval = offset; |
| 247 | } |
| 248 | out: |
| 249 | mutex_unlock(&inode->i_mutex); |
| 250 | return retval; |
| 251 | } |
| 252 | EXPORT_SYMBOL(default_llseek); |
| 253 | |
| 254 | loff_t vfs_llseek(struct file *file, loff_t offset, int whence) |
| 255 | { |
| 256 | loff_t (*fn)(struct file *, loff_t, int); |
| 257 | |
| 258 | fn = no_llseek; |
| 259 | if (file->f_mode & FMODE_LSEEK) { |
| 260 | if (file->f_op->llseek) |
| 261 | fn = file->f_op->llseek; |
| 262 | } |
| 263 | return fn(file, offset, whence); |
| 264 | } |
| 265 | EXPORT_SYMBOL(vfs_llseek); |
| 266 | |
| 267 | SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence) |
| 268 | { |
| 269 | off_t retval; |
| 270 | struct fd f = fdget(fd); |
| 271 | if (!f.file) |
| 272 | return -EBADF; |
| 273 | |
| 274 | retval = -EINVAL; |
| 275 | if (whence <= SEEK_MAX) { |
| 276 | loff_t res = vfs_llseek(f.file, offset, whence); |
| 277 | retval = res; |
| 278 | if (res != (loff_t)retval) |
| 279 | retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ |
| 280 | } |
| 281 | fdput(f); |
| 282 | return retval; |
| 283 | } |
| 284 | |
| 285 | #ifdef CONFIG_COMPAT |
| 286 | COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence) |
| 287 | { |
| 288 | return sys_lseek(fd, offset, whence); |
| 289 | } |
| 290 | #endif |
| 291 | |
| 292 | #ifdef __ARCH_WANT_SYS_LLSEEK |
| 293 | SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, |
| 294 | unsigned long, offset_low, loff_t __user *, result, |
| 295 | unsigned int, whence) |
| 296 | { |
| 297 | int retval; |
| 298 | struct fd f = fdget(fd); |
| 299 | loff_t offset; |
| 300 | |
| 301 | if (!f.file) |
| 302 | return -EBADF; |
| 303 | |
| 304 | retval = -EINVAL; |
| 305 | if (whence > SEEK_MAX) |
| 306 | goto out_putf; |
| 307 | |
| 308 | offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, |
| 309 | whence); |
| 310 | |
| 311 | retval = (int)offset; |
| 312 | if (offset >= 0) { |
| 313 | retval = -EFAULT; |
| 314 | if (!copy_to_user(result, &offset, sizeof(offset))) |
| 315 | retval = 0; |
| 316 | } |
| 317 | out_putf: |
| 318 | fdput(f); |
| 319 | return retval; |
| 320 | } |
| 321 | #endif |
| 322 | |
| 323 | /* |
| 324 | * rw_verify_area doesn't like huge counts. We limit |
| 325 | * them to something that fits in "int" so that others |
| 326 | * won't have to do range checks all the time. |
| 327 | */ |
| 328 | int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count) |
| 329 | { |
| 330 | struct inode *inode; |
| 331 | loff_t pos; |
| 332 | int retval = -EINVAL; |
| 333 | |
| 334 | inode = file_inode(file); |
| 335 | if (unlikely((ssize_t) count < 0)) |
| 336 | return retval; |
| 337 | pos = *ppos; |
| 338 | if (unlikely(pos < 0)) { |
| 339 | if (!unsigned_offsets(file)) |
| 340 | return retval; |
| 341 | if (count >= -pos) /* both values are in 0..LLONG_MAX */ |
| 342 | return -EOVERFLOW; |
| 343 | } else if (unlikely((loff_t) (pos + count) < 0)) { |
| 344 | if (!unsigned_offsets(file)) |
| 345 | return retval; |
| 346 | } |
| 347 | |
| 348 | if (unlikely(inode->i_flock && mandatory_lock(inode))) { |
| 349 | retval = locks_mandatory_area( |
| 350 | read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, |
| 351 | inode, file, pos, count); |
| 352 | if (retval < 0) |
| 353 | return retval; |
| 354 | } |
| 355 | retval = security_file_permission(file, |
| 356 | read_write == READ ? MAY_READ : MAY_WRITE); |
| 357 | if (retval) |
| 358 | return retval; |
| 359 | return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; |
| 360 | } |
| 361 | |
| 362 | ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
| 363 | { |
| 364 | struct iovec iov = { .iov_base = buf, .iov_len = len }; |
| 365 | struct kiocb kiocb; |
| 366 | ssize_t ret; |
| 367 | |
| 368 | init_sync_kiocb(&kiocb, filp); |
| 369 | kiocb.ki_pos = *ppos; |
| 370 | kiocb.ki_nbytes = len; |
| 371 | |
| 372 | ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); |
| 373 | if (-EIOCBQUEUED == ret) |
| 374 | ret = wait_on_sync_kiocb(&kiocb); |
| 375 | *ppos = kiocb.ki_pos; |
| 376 | return ret; |
| 377 | } |
| 378 | |
| 379 | EXPORT_SYMBOL(do_sync_read); |
| 380 | |
| 381 | ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) |
| 382 | { |
| 383 | ssize_t ret; |
| 384 | |
| 385 | if (!(file->f_mode & FMODE_READ)) |
| 386 | return -EBADF; |
| 387 | if (!file->f_op->read && !file->f_op->aio_read) |
| 388 | return -EINVAL; |
| 389 | if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) |
| 390 | return -EFAULT; |
| 391 | |
| 392 | ret = rw_verify_area(READ, file, pos, count); |
| 393 | if (ret >= 0) { |
| 394 | count = ret; |
| 395 | if (file->f_op->read) |
| 396 | ret = file->f_op->read(file, buf, count, pos); |
| 397 | else |
| 398 | ret = do_sync_read(file, buf, count, pos); |
| 399 | if (ret > 0) { |
| 400 | fsnotify_access(file); |
| 401 | add_rchar(current, ret); |
| 402 | } |
| 403 | inc_syscr(current); |
| 404 | } |
| 405 | |
| 406 | return ret; |
| 407 | } |
| 408 | |
| 409 | EXPORT_SYMBOL(vfs_read); |
| 410 | |
| 411 | ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
| 412 | { |
| 413 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
| 414 | struct kiocb kiocb; |
| 415 | ssize_t ret; |
| 416 | |
| 417 | init_sync_kiocb(&kiocb, filp); |
| 418 | kiocb.ki_pos = *ppos; |
| 419 | kiocb.ki_nbytes = len; |
| 420 | |
| 421 | ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); |
| 422 | if (-EIOCBQUEUED == ret) |
| 423 | ret = wait_on_sync_kiocb(&kiocb); |
| 424 | *ppos = kiocb.ki_pos; |
| 425 | return ret; |
| 426 | } |
| 427 | |
| 428 | EXPORT_SYMBOL(do_sync_write); |
| 429 | |
| 430 | ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) |
| 431 | { |
| 432 | mm_segment_t old_fs; |
| 433 | const char __user *p; |
| 434 | ssize_t ret; |
| 435 | |
| 436 | if (!file->f_op->write && !file->f_op->aio_write) |
| 437 | return -EINVAL; |
| 438 | |
| 439 | old_fs = get_fs(); |
| 440 | set_fs(get_ds()); |
| 441 | p = (__force const char __user *)buf; |
| 442 | if (count > MAX_RW_COUNT) |
| 443 | count = MAX_RW_COUNT; |
| 444 | if (file->f_op->write) |
| 445 | ret = file->f_op->write(file, p, count, pos); |
| 446 | else |
| 447 | ret = do_sync_write(file, p, count, pos); |
| 448 | set_fs(old_fs); |
| 449 | if (ret > 0) { |
| 450 | fsnotify_modify(file); |
| 451 | add_wchar(current, ret); |
| 452 | } |
| 453 | inc_syscw(current); |
| 454 | return ret; |
| 455 | } |
| 456 | |
| 457 | ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) |
| 458 | { |
| 459 | ssize_t ret; |
| 460 | |
| 461 | if (!(file->f_mode & FMODE_WRITE)) |
| 462 | return -EBADF; |
| 463 | if (!file->f_op->write && !file->f_op->aio_write) |
| 464 | return -EINVAL; |
| 465 | if (unlikely(!access_ok(VERIFY_READ, buf, count))) |
| 466 | return -EFAULT; |
| 467 | |
| 468 | ret = rw_verify_area(WRITE, file, pos, count); |
| 469 | if (ret >= 0) { |
| 470 | count = ret; |
| 471 | file_start_write(file); |
| 472 | if (file->f_op->write) |
| 473 | ret = file->f_op->write(file, buf, count, pos); |
| 474 | else |
| 475 | ret = do_sync_write(file, buf, count, pos); |
| 476 | if (ret > 0) { |
| 477 | fsnotify_modify(file); |
| 478 | add_wchar(current, ret); |
| 479 | } |
| 480 | inc_syscw(current); |
| 481 | file_end_write(file); |
| 482 | } |
| 483 | |
| 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | EXPORT_SYMBOL(vfs_write); |
| 488 | |
| 489 | static inline loff_t file_pos_read(struct file *file) |
| 490 | { |
| 491 | return file->f_pos; |
| 492 | } |
| 493 | |
| 494 | static inline void file_pos_write(struct file *file, loff_t pos) |
| 495 | { |
| 496 | file->f_pos = pos; |
| 497 | } |
| 498 | |
| 499 | SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) |
| 500 | { |
| 501 | struct fd f = fdget(fd); |
| 502 | ssize_t ret = -EBADF; |
| 503 | |
| 504 | if (f.file) { |
| 505 | loff_t pos = file_pos_read(f.file); |
| 506 | ret = vfs_read(f.file, buf, count, &pos); |
| 507 | if (ret >= 0) |
| 508 | file_pos_write(f.file, pos); |
| 509 | fdput(f); |
| 510 | } |
| 511 | return ret; |
| 512 | } |
| 513 | |
| 514 | SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, |
| 515 | size_t, count) |
| 516 | { |
| 517 | struct fd f = fdget(fd); |
| 518 | ssize_t ret = -EBADF; |
| 519 | |
| 520 | if (f.file) { |
| 521 | loff_t pos = file_pos_read(f.file); |
| 522 | ret = vfs_write(f.file, buf, count, &pos); |
| 523 | if (ret >= 0) |
| 524 | file_pos_write(f.file, pos); |
| 525 | fdput(f); |
| 526 | } |
| 527 | |
| 528 | return ret; |
| 529 | } |
| 530 | |
| 531 | SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf, |
| 532 | size_t, count, loff_t, pos) |
| 533 | { |
| 534 | struct fd f; |
| 535 | ssize_t ret = -EBADF; |
| 536 | |
| 537 | if (pos < 0) |
| 538 | return -EINVAL; |
| 539 | |
| 540 | f = fdget(fd); |
| 541 | if (f.file) { |
| 542 | ret = -ESPIPE; |
| 543 | if (f.file->f_mode & FMODE_PREAD) |
| 544 | ret = vfs_read(f.file, buf, count, &pos); |
| 545 | fdput(f); |
| 546 | } |
| 547 | |
| 548 | return ret; |
| 549 | } |
| 550 | |
| 551 | SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf, |
| 552 | size_t, count, loff_t, pos) |
| 553 | { |
| 554 | struct fd f; |
| 555 | ssize_t ret = -EBADF; |
| 556 | |
| 557 | if (pos < 0) |
| 558 | return -EINVAL; |
| 559 | |
| 560 | f = fdget(fd); |
| 561 | if (f.file) { |
| 562 | ret = -ESPIPE; |
| 563 | if (f.file->f_mode & FMODE_PWRITE) |
| 564 | ret = vfs_write(f.file, buf, count, &pos); |
| 565 | fdput(f); |
| 566 | } |
| 567 | |
| 568 | return ret; |
| 569 | } |
| 570 | |
| 571 | /* |
| 572 | * Reduce an iovec's length in-place. Return the resulting number of segments |
| 573 | */ |
| 574 | unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) |
| 575 | { |
| 576 | unsigned long seg = 0; |
| 577 | size_t len = 0; |
| 578 | |
| 579 | while (seg < nr_segs) { |
| 580 | seg++; |
| 581 | if (len + iov->iov_len >= to) { |
| 582 | iov->iov_len = to - len; |
| 583 | break; |
| 584 | } |
| 585 | len += iov->iov_len; |
| 586 | iov++; |
| 587 | } |
| 588 | return seg; |
| 589 | } |
| 590 | EXPORT_SYMBOL(iov_shorten); |
| 591 | |
| 592 | static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, |
| 593 | unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn) |
| 594 | { |
| 595 | struct kiocb kiocb; |
| 596 | ssize_t ret; |
| 597 | |
| 598 | init_sync_kiocb(&kiocb, filp); |
| 599 | kiocb.ki_pos = *ppos; |
| 600 | kiocb.ki_nbytes = len; |
| 601 | |
| 602 | ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos); |
| 603 | if (ret == -EIOCBQUEUED) |
| 604 | ret = wait_on_sync_kiocb(&kiocb); |
| 605 | *ppos = kiocb.ki_pos; |
| 606 | return ret; |
| 607 | } |
| 608 | |
| 609 | /* Do it by hand, with file-ops */ |
| 610 | static ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov, |
| 611 | unsigned long nr_segs, loff_t *ppos, io_fn_t fn) |
| 612 | { |
| 613 | struct iovec *vector = iov; |
| 614 | ssize_t ret = 0; |
| 615 | |
| 616 | while (nr_segs > 0) { |
| 617 | void __user *base; |
| 618 | size_t len; |
| 619 | ssize_t nr; |
| 620 | |
| 621 | base = vector->iov_base; |
| 622 | len = vector->iov_len; |
| 623 | vector++; |
| 624 | nr_segs--; |
| 625 | |
| 626 | nr = fn(filp, base, len, ppos); |
| 627 | |
| 628 | if (nr < 0) { |
| 629 | if (!ret) |
| 630 | ret = nr; |
| 631 | break; |
| 632 | } |
| 633 | ret += nr; |
| 634 | if (nr != len) |
| 635 | break; |
| 636 | } |
| 637 | |
| 638 | return ret; |
| 639 | } |
| 640 | |
| 641 | /* A write operation does a read from user space and vice versa */ |
| 642 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
| 643 | |
| 644 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
| 645 | unsigned long nr_segs, unsigned long fast_segs, |
| 646 | struct iovec *fast_pointer, |
| 647 | struct iovec **ret_pointer) |
| 648 | { |
| 649 | unsigned long seg; |
| 650 | ssize_t ret; |
| 651 | struct iovec *iov = fast_pointer; |
| 652 | |
| 653 | /* |
| 654 | * SuS says "The readv() function *may* fail if the iovcnt argument |
| 655 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
| 656 | * traditionally returned zero for zero segments, so... |
| 657 | */ |
| 658 | if (nr_segs == 0) { |
| 659 | ret = 0; |
| 660 | goto out; |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * First get the "struct iovec" from user memory and |
| 665 | * verify all the pointers |
| 666 | */ |
| 667 | if (nr_segs > UIO_MAXIOV) { |
| 668 | ret = -EINVAL; |
| 669 | goto out; |
| 670 | } |
| 671 | if (nr_segs > fast_segs) { |
| 672 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
| 673 | if (iov == NULL) { |
| 674 | ret = -ENOMEM; |
| 675 | goto out; |
| 676 | } |
| 677 | } |
| 678 | if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { |
| 679 | ret = -EFAULT; |
| 680 | goto out; |
| 681 | } |
| 682 | |
| 683 | /* |
| 684 | * According to the Single Unix Specification we should return EINVAL |
| 685 | * if an element length is < 0 when cast to ssize_t or if the |
| 686 | * total length would overflow the ssize_t return value of the |
| 687 | * system call. |
| 688 | * |
| 689 | * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the |
| 690 | * overflow case. |
| 691 | */ |
| 692 | ret = 0; |
| 693 | for (seg = 0; seg < nr_segs; seg++) { |
| 694 | void __user *buf = iov[seg].iov_base; |
| 695 | ssize_t len = (ssize_t)iov[seg].iov_len; |
| 696 | |
| 697 | /* see if we we're about to use an invalid len or if |
| 698 | * it's about to overflow ssize_t */ |
| 699 | if (len < 0) { |
| 700 | ret = -EINVAL; |
| 701 | goto out; |
| 702 | } |
| 703 | if (type >= 0 |
| 704 | && unlikely(!access_ok(vrfy_dir(type), buf, len))) { |
| 705 | ret = -EFAULT; |
| 706 | goto out; |
| 707 | } |
| 708 | if (len > MAX_RW_COUNT - ret) { |
| 709 | len = MAX_RW_COUNT - ret; |
| 710 | iov[seg].iov_len = len; |
| 711 | } |
| 712 | ret += len; |
| 713 | } |
| 714 | out: |
| 715 | *ret_pointer = iov; |
| 716 | return ret; |
| 717 | } |
| 718 | |
| 719 | static ssize_t do_readv_writev(int type, struct file *file, |
| 720 | const struct iovec __user * uvector, |
| 721 | unsigned long nr_segs, loff_t *pos) |
| 722 | { |
| 723 | size_t tot_len; |
| 724 | struct iovec iovstack[UIO_FASTIOV]; |
| 725 | struct iovec *iov = iovstack; |
| 726 | ssize_t ret; |
| 727 | io_fn_t fn; |
| 728 | iov_fn_t fnv; |
| 729 | |
| 730 | ret = rw_copy_check_uvector(type, uvector, nr_segs, |
| 731 | ARRAY_SIZE(iovstack), iovstack, &iov); |
| 732 | if (ret <= 0) |
| 733 | goto out; |
| 734 | |
| 735 | tot_len = ret; |
| 736 | ret = rw_verify_area(type, file, pos, tot_len); |
| 737 | if (ret < 0) |
| 738 | goto out; |
| 739 | |
| 740 | fnv = NULL; |
| 741 | if (type == READ) { |
| 742 | fn = file->f_op->read; |
| 743 | fnv = file->f_op->aio_read; |
| 744 | } else { |
| 745 | fn = (io_fn_t)file->f_op->write; |
| 746 | fnv = file->f_op->aio_write; |
| 747 | file_start_write(file); |
| 748 | } |
| 749 | |
| 750 | if (fnv) |
| 751 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
| 752 | pos, fnv); |
| 753 | else |
| 754 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
| 755 | |
| 756 | if (type != READ) |
| 757 | file_end_write(file); |
| 758 | |
| 759 | out: |
| 760 | if (iov != iovstack) |
| 761 | kfree(iov); |
| 762 | if ((ret + (type == READ)) > 0) { |
| 763 | if (type == READ) |
| 764 | fsnotify_access(file); |
| 765 | else |
| 766 | fsnotify_modify(file); |
| 767 | } |
| 768 | return ret; |
| 769 | } |
| 770 | |
| 771 | ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, |
| 772 | unsigned long vlen, loff_t *pos) |
| 773 | { |
| 774 | if (!(file->f_mode & FMODE_READ)) |
| 775 | return -EBADF; |
| 776 | if (!file->f_op->aio_read && !file->f_op->read) |
| 777 | return -EINVAL; |
| 778 | |
| 779 | return do_readv_writev(READ, file, vec, vlen, pos); |
| 780 | } |
| 781 | |
| 782 | EXPORT_SYMBOL(vfs_readv); |
| 783 | |
| 784 | ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, |
| 785 | unsigned long vlen, loff_t *pos) |
| 786 | { |
| 787 | if (!(file->f_mode & FMODE_WRITE)) |
| 788 | return -EBADF; |
| 789 | if (!file->f_op->aio_write && !file->f_op->write) |
| 790 | return -EINVAL; |
| 791 | |
| 792 | return do_readv_writev(WRITE, file, vec, vlen, pos); |
| 793 | } |
| 794 | |
| 795 | EXPORT_SYMBOL(vfs_writev); |
| 796 | |
| 797 | SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, |
| 798 | unsigned long, vlen) |
| 799 | { |
| 800 | struct fd f = fdget(fd); |
| 801 | ssize_t ret = -EBADF; |
| 802 | |
| 803 | if (f.file) { |
| 804 | loff_t pos = file_pos_read(f.file); |
| 805 | ret = vfs_readv(f.file, vec, vlen, &pos); |
| 806 | if (ret >= 0) |
| 807 | file_pos_write(f.file, pos); |
| 808 | fdput(f); |
| 809 | } |
| 810 | |
| 811 | if (ret > 0) |
| 812 | add_rchar(current, ret); |
| 813 | inc_syscr(current); |
| 814 | return ret; |
| 815 | } |
| 816 | |
| 817 | SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, |
| 818 | unsigned long, vlen) |
| 819 | { |
| 820 | struct fd f = fdget(fd); |
| 821 | ssize_t ret = -EBADF; |
| 822 | |
| 823 | if (f.file) { |
| 824 | loff_t pos = file_pos_read(f.file); |
| 825 | ret = vfs_writev(f.file, vec, vlen, &pos); |
| 826 | if (ret >= 0) |
| 827 | file_pos_write(f.file, pos); |
| 828 | fdput(f); |
| 829 | } |
| 830 | |
| 831 | if (ret > 0) |
| 832 | add_wchar(current, ret); |
| 833 | inc_syscw(current); |
| 834 | return ret; |
| 835 | } |
| 836 | |
| 837 | static inline loff_t pos_from_hilo(unsigned long high, unsigned long low) |
| 838 | { |
| 839 | #define HALF_LONG_BITS (BITS_PER_LONG / 2) |
| 840 | return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; |
| 841 | } |
| 842 | |
| 843 | SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, |
| 844 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
| 845 | { |
| 846 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
| 847 | struct fd f; |
| 848 | ssize_t ret = -EBADF; |
| 849 | |
| 850 | if (pos < 0) |
| 851 | return -EINVAL; |
| 852 | |
| 853 | f = fdget(fd); |
| 854 | if (f.file) { |
| 855 | ret = -ESPIPE; |
| 856 | if (f.file->f_mode & FMODE_PREAD) |
| 857 | ret = vfs_readv(f.file, vec, vlen, &pos); |
| 858 | fdput(f); |
| 859 | } |
| 860 | |
| 861 | if (ret > 0) |
| 862 | add_rchar(current, ret); |
| 863 | inc_syscr(current); |
| 864 | return ret; |
| 865 | } |
| 866 | |
| 867 | SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, |
| 868 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
| 869 | { |
| 870 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
| 871 | struct fd f; |
| 872 | ssize_t ret = -EBADF; |
| 873 | |
| 874 | if (pos < 0) |
| 875 | return -EINVAL; |
| 876 | |
| 877 | f = fdget(fd); |
| 878 | if (f.file) { |
| 879 | ret = -ESPIPE; |
| 880 | if (f.file->f_mode & FMODE_PWRITE) |
| 881 | ret = vfs_writev(f.file, vec, vlen, &pos); |
| 882 | fdput(f); |
| 883 | } |
| 884 | |
| 885 | if (ret > 0) |
| 886 | add_wchar(current, ret); |
| 887 | inc_syscw(current); |
| 888 | return ret; |
| 889 | } |
| 890 | |
| 891 | #ifdef CONFIG_COMPAT |
| 892 | |
| 893 | static ssize_t compat_do_readv_writev(int type, struct file *file, |
| 894 | const struct compat_iovec __user *uvector, |
| 895 | unsigned long nr_segs, loff_t *pos) |
| 896 | { |
| 897 | compat_ssize_t tot_len; |
| 898 | struct iovec iovstack[UIO_FASTIOV]; |
| 899 | struct iovec *iov = iovstack; |
| 900 | ssize_t ret; |
| 901 | io_fn_t fn; |
| 902 | iov_fn_t fnv; |
| 903 | |
| 904 | ret = compat_rw_copy_check_uvector(type, uvector, nr_segs, |
| 905 | UIO_FASTIOV, iovstack, &iov); |
| 906 | if (ret <= 0) |
| 907 | goto out; |
| 908 | |
| 909 | tot_len = ret; |
| 910 | ret = rw_verify_area(type, file, pos, tot_len); |
| 911 | if (ret < 0) |
| 912 | goto out; |
| 913 | |
| 914 | fnv = NULL; |
| 915 | if (type == READ) { |
| 916 | fn = file->f_op->read; |
| 917 | fnv = file->f_op->aio_read; |
| 918 | } else { |
| 919 | fn = (io_fn_t)file->f_op->write; |
| 920 | fnv = file->f_op->aio_write; |
| 921 | file_start_write(file); |
| 922 | } |
| 923 | |
| 924 | if (fnv) |
| 925 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
| 926 | pos, fnv); |
| 927 | else |
| 928 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
| 929 | |
| 930 | if (type != READ) |
| 931 | file_end_write(file); |
| 932 | |
| 933 | out: |
| 934 | if (iov != iovstack) |
| 935 | kfree(iov); |
| 936 | if ((ret + (type == READ)) > 0) { |
| 937 | if (type == READ) |
| 938 | fsnotify_access(file); |
| 939 | else |
| 940 | fsnotify_modify(file); |
| 941 | } |
| 942 | return ret; |
| 943 | } |
| 944 | |
| 945 | static size_t compat_readv(struct file *file, |
| 946 | const struct compat_iovec __user *vec, |
| 947 | unsigned long vlen, loff_t *pos) |
| 948 | { |
| 949 | ssize_t ret = -EBADF; |
| 950 | |
| 951 | if (!(file->f_mode & FMODE_READ)) |
| 952 | goto out; |
| 953 | |
| 954 | ret = -EINVAL; |
| 955 | if (!file->f_op->aio_read && !file->f_op->read) |
| 956 | goto out; |
| 957 | |
| 958 | ret = compat_do_readv_writev(READ, file, vec, vlen, pos); |
| 959 | |
| 960 | out: |
| 961 | if (ret > 0) |
| 962 | add_rchar(current, ret); |
| 963 | inc_syscr(current); |
| 964 | return ret; |
| 965 | } |
| 966 | |
| 967 | COMPAT_SYSCALL_DEFINE3(readv, unsigned long, fd, |
| 968 | const struct compat_iovec __user *,vec, |
| 969 | unsigned long, vlen) |
| 970 | { |
| 971 | struct fd f = fdget(fd); |
| 972 | ssize_t ret; |
| 973 | loff_t pos; |
| 974 | |
| 975 | if (!f.file) |
| 976 | return -EBADF; |
| 977 | pos = f.file->f_pos; |
| 978 | ret = compat_readv(f.file, vec, vlen, &pos); |
| 979 | if (ret >= 0) |
| 980 | f.file->f_pos = pos; |
| 981 | fdput(f); |
| 982 | return ret; |
| 983 | } |
| 984 | |
| 985 | COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, |
| 986 | const struct compat_iovec __user *,vec, |
| 987 | unsigned long, vlen, loff_t, pos) |
| 988 | { |
| 989 | struct fd f; |
| 990 | ssize_t ret; |
| 991 | |
| 992 | if (pos < 0) |
| 993 | return -EINVAL; |
| 994 | f = fdget(fd); |
| 995 | if (!f.file) |
| 996 | return -EBADF; |
| 997 | ret = -ESPIPE; |
| 998 | if (f.file->f_mode & FMODE_PREAD) |
| 999 | ret = compat_readv(f.file, vec, vlen, &pos); |
| 1000 | fdput(f); |
| 1001 | return ret; |
| 1002 | } |
| 1003 | |
| 1004 | COMPAT_SYSCALL_DEFINE5(preadv, unsigned long, fd, |
| 1005 | const struct compat_iovec __user *,vec, |
| 1006 | unsigned long, vlen, u32, pos_low, u32, pos_high) |
| 1007 | { |
| 1008 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
| 1009 | return compat_sys_preadv64(fd, vec, vlen, pos); |
| 1010 | } |
| 1011 | |
| 1012 | static size_t compat_writev(struct file *file, |
| 1013 | const struct compat_iovec __user *vec, |
| 1014 | unsigned long vlen, loff_t *pos) |
| 1015 | { |
| 1016 | ssize_t ret = -EBADF; |
| 1017 | |
| 1018 | if (!(file->f_mode & FMODE_WRITE)) |
| 1019 | goto out; |
| 1020 | |
| 1021 | ret = -EINVAL; |
| 1022 | if (!file->f_op->aio_write && !file->f_op->write) |
| 1023 | goto out; |
| 1024 | |
| 1025 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); |
| 1026 | |
| 1027 | out: |
| 1028 | if (ret > 0) |
| 1029 | add_wchar(current, ret); |
| 1030 | inc_syscw(current); |
| 1031 | return ret; |
| 1032 | } |
| 1033 | |
| 1034 | COMPAT_SYSCALL_DEFINE3(writev, unsigned long, fd, |
| 1035 | const struct compat_iovec __user *, vec, |
| 1036 | unsigned long, vlen) |
| 1037 | { |
| 1038 | struct fd f = fdget(fd); |
| 1039 | ssize_t ret; |
| 1040 | loff_t pos; |
| 1041 | |
| 1042 | if (!f.file) |
| 1043 | return -EBADF; |
| 1044 | pos = f.file->f_pos; |
| 1045 | ret = compat_writev(f.file, vec, vlen, &pos); |
| 1046 | if (ret >= 0) |
| 1047 | f.file->f_pos = pos; |
| 1048 | fdput(f); |
| 1049 | return ret; |
| 1050 | } |
| 1051 | |
| 1052 | COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, |
| 1053 | const struct compat_iovec __user *,vec, |
| 1054 | unsigned long, vlen, loff_t, pos) |
| 1055 | { |
| 1056 | struct fd f; |
| 1057 | ssize_t ret; |
| 1058 | |
| 1059 | if (pos < 0) |
| 1060 | return -EINVAL; |
| 1061 | f = fdget(fd); |
| 1062 | if (!f.file) |
| 1063 | return -EBADF; |
| 1064 | ret = -ESPIPE; |
| 1065 | if (f.file->f_mode & FMODE_PWRITE) |
| 1066 | ret = compat_writev(f.file, vec, vlen, &pos); |
| 1067 | fdput(f); |
| 1068 | return ret; |
| 1069 | } |
| 1070 | |
| 1071 | COMPAT_SYSCALL_DEFINE5(pwritev, unsigned long, fd, |
| 1072 | const struct compat_iovec __user *,vec, |
| 1073 | unsigned long, vlen, u32, pos_low, u32, pos_high) |
| 1074 | { |
| 1075 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
| 1076 | return compat_sys_pwritev64(fd, vec, vlen, pos); |
| 1077 | } |
| 1078 | #endif |
| 1079 | |
| 1080 | static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, |
| 1081 | size_t count, loff_t max) |
| 1082 | { |
| 1083 | struct fd in, out; |
| 1084 | struct inode *in_inode, *out_inode; |
| 1085 | loff_t pos; |
| 1086 | loff_t out_pos; |
| 1087 | ssize_t retval; |
| 1088 | int fl; |
| 1089 | |
| 1090 | /* |
| 1091 | * Get input file, and verify that it is ok.. |
| 1092 | */ |
| 1093 | retval = -EBADF; |
| 1094 | in = fdget(in_fd); |
| 1095 | if (!in.file) |
| 1096 | goto out; |
| 1097 | if (!(in.file->f_mode & FMODE_READ)) |
| 1098 | goto fput_in; |
| 1099 | retval = -ESPIPE; |
| 1100 | if (!ppos) { |
| 1101 | pos = in.file->f_pos; |
| 1102 | } else { |
| 1103 | pos = *ppos; |
| 1104 | if (!(in.file->f_mode & FMODE_PREAD)) |
| 1105 | goto fput_in; |
| 1106 | } |
| 1107 | retval = rw_verify_area(READ, in.file, &pos, count); |
| 1108 | if (retval < 0) |
| 1109 | goto fput_in; |
| 1110 | count = retval; |
| 1111 | |
| 1112 | /* |
| 1113 | * Get output file, and verify that it is ok.. |
| 1114 | */ |
| 1115 | retval = -EBADF; |
| 1116 | out = fdget(out_fd); |
| 1117 | if (!out.file) |
| 1118 | goto fput_in; |
| 1119 | if (!(out.file->f_mode & FMODE_WRITE)) |
| 1120 | goto fput_out; |
| 1121 | retval = -EINVAL; |
| 1122 | in_inode = file_inode(in.file); |
| 1123 | out_inode = file_inode(out.file); |
| 1124 | out_pos = out.file->f_pos; |
| 1125 | retval = rw_verify_area(WRITE, out.file, &out_pos, count); |
| 1126 | if (retval < 0) |
| 1127 | goto fput_out; |
| 1128 | count = retval; |
| 1129 | |
| 1130 | if (!max) |
| 1131 | max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); |
| 1132 | |
| 1133 | if (unlikely(pos + count > max)) { |
| 1134 | retval = -EOVERFLOW; |
| 1135 | if (pos >= max) |
| 1136 | goto fput_out; |
| 1137 | count = max - pos; |
| 1138 | } |
| 1139 | |
| 1140 | fl = 0; |
| 1141 | #if 0 |
| 1142 | /* |
| 1143 | * We need to debate whether we can enable this or not. The |
| 1144 | * man page documents EAGAIN return for the output at least, |
| 1145 | * and the application is arguably buggy if it doesn't expect |
| 1146 | * EAGAIN on a non-blocking file descriptor. |
| 1147 | */ |
| 1148 | if (in.file->f_flags & O_NONBLOCK) |
| 1149 | fl = SPLICE_F_NONBLOCK; |
| 1150 | #endif |
| 1151 | file_start_write(out.file); |
| 1152 | retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl); |
| 1153 | file_end_write(out.file); |
| 1154 | |
| 1155 | if (retval > 0) { |
| 1156 | add_rchar(current, retval); |
| 1157 | add_wchar(current, retval); |
| 1158 | fsnotify_access(in.file); |
| 1159 | fsnotify_modify(out.file); |
| 1160 | out.file->f_pos = out_pos; |
| 1161 | if (ppos) |
| 1162 | *ppos = pos; |
| 1163 | else |
| 1164 | in.file->f_pos = pos; |
| 1165 | } |
| 1166 | |
| 1167 | inc_syscr(current); |
| 1168 | inc_syscw(current); |
| 1169 | if (pos > max) |
| 1170 | retval = -EOVERFLOW; |
| 1171 | |
| 1172 | fput_out: |
| 1173 | fdput(out); |
| 1174 | fput_in: |
| 1175 | fdput(in); |
| 1176 | out: |
| 1177 | return retval; |
| 1178 | } |
| 1179 | |
| 1180 | SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count) |
| 1181 | { |
| 1182 | loff_t pos; |
| 1183 | off_t off; |
| 1184 | ssize_t ret; |
| 1185 | |
| 1186 | if (offset) { |
| 1187 | if (unlikely(get_user(off, offset))) |
| 1188 | return -EFAULT; |
| 1189 | pos = off; |
| 1190 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
| 1191 | if (unlikely(put_user(pos, offset))) |
| 1192 | return -EFAULT; |
| 1193 | return ret; |
| 1194 | } |
| 1195 | |
| 1196 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1197 | } |
| 1198 | |
| 1199 | SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count) |
| 1200 | { |
| 1201 | loff_t pos; |
| 1202 | ssize_t ret; |
| 1203 | |
| 1204 | if (offset) { |
| 1205 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
| 1206 | return -EFAULT; |
| 1207 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
| 1208 | if (unlikely(put_user(pos, offset))) |
| 1209 | return -EFAULT; |
| 1210 | return ret; |
| 1211 | } |
| 1212 | |
| 1213 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1214 | } |
| 1215 | |
| 1216 | #ifdef CONFIG_COMPAT |
| 1217 | COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, |
| 1218 | compat_off_t __user *, offset, compat_size_t, count) |
| 1219 | { |
| 1220 | loff_t pos; |
| 1221 | off_t off; |
| 1222 | ssize_t ret; |
| 1223 | |
| 1224 | if (offset) { |
| 1225 | if (unlikely(get_user(off, offset))) |
| 1226 | return -EFAULT; |
| 1227 | pos = off; |
| 1228 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
| 1229 | if (unlikely(put_user(pos, offset))) |
| 1230 | return -EFAULT; |
| 1231 | return ret; |
| 1232 | } |
| 1233 | |
| 1234 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1235 | } |
| 1236 | |
| 1237 | COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, |
| 1238 | compat_loff_t __user *, offset, compat_size_t, count) |
| 1239 | { |
| 1240 | loff_t pos; |
| 1241 | ssize_t ret; |
| 1242 | |
| 1243 | if (offset) { |
| 1244 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
| 1245 | return -EFAULT; |
| 1246 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
| 1247 | if (unlikely(put_user(pos, offset))) |
| 1248 | return -EFAULT; |
| 1249 | return ret; |
| 1250 | } |
| 1251 | |
| 1252 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
| 1253 | } |
| 1254 | #endif |