Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/ioctl.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | #include <linux/syscalls.h> |
9 | #include <linux/mm.h> | |
16f7e0fe | 10 | #include <linux/capability.h> |
2952db0f | 11 | #include <linux/compat.h> |
1da177e4 LT |
12 | #include <linux/file.h> |
13 | #include <linux/fs.h> | |
14 | #include <linux/security.h> | |
630d9c47 | 15 | #include <linux/export.h> |
c9845ff1 | 16 | #include <linux/uaccess.h> |
68c9d702 JB |
17 | #include <linux/writeback.h> |
18 | #include <linux/buffer_head.h> | |
3e63cbb1 | 19 | #include <linux/falloc.h> |
f361bf4a IM |
20 | #include <linux/sched/signal.h> |
21 | ||
66cf191f | 22 | #include "internal.h" |
1da177e4 | 23 | |
1da177e4 LT |
24 | #include <asm/ioctls.h> |
25 | ||
c4b929b8 MF |
26 | /* So that the fiemap access checks can't overflow on 32 bit machines. */ |
27 | #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) | |
28 | ||
deb21db7 EZ |
29 | /** |
30 | * vfs_ioctl - call filesystem specific ioctl methods | |
f6a4c8bd CH |
31 | * @filp: open file to invoke ioctl method on |
32 | * @cmd: ioctl command to execute | |
33 | * @arg: command-specific argument for ioctl | |
deb21db7 EZ |
34 | * |
35 | * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise | |
deb21db7 EZ |
36 | * returns -ENOTTY. |
37 | * | |
38 | * Returns 0 on success, -errno on error. | |
39 | */ | |
66cf191f | 40 | long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
41 | { |
42 | int error = -ENOTTY; | |
43 | ||
72c2d531 | 44 | if (!filp->f_op->unlocked_ioctl) |
1da177e4 LT |
45 | goto out; |
46 | ||
b19dd42f AB |
47 | error = filp->f_op->unlocked_ioctl(filp, cmd, arg); |
48 | if (error == -ENOIOCTLCMD) | |
07d106d0 | 49 | error = -ENOTTY; |
1da177e4 LT |
50 | out: |
51 | return error; | |
52 | } | |
9df6702a | 53 | EXPORT_SYMBOL(vfs_ioctl); |
1da177e4 | 54 | |
aa81a7c7 EZ |
55 | static int ioctl_fibmap(struct file *filp, int __user *p) |
56 | { | |
0d89fdae CM |
57 | struct inode *inode = file_inode(filp); |
58 | int error, ur_block; | |
59 | sector_t block; | |
aa81a7c7 | 60 | |
aa81a7c7 EZ |
61 | if (!capable(CAP_SYS_RAWIO)) |
62 | return -EPERM; | |
0d89fdae CM |
63 | |
64 | error = get_user(ur_block, p); | |
65 | if (error) | |
66 | return error; | |
67 | ||
324282c0 CM |
68 | if (ur_block < 0) |
69 | return -EINVAL; | |
70 | ||
0d89fdae CM |
71 | block = ur_block; |
72 | error = bmap(inode, &block); | |
73 | ||
74 | if (error) | |
75 | ur_block = 0; | |
76 | else | |
77 | ur_block = block; | |
78 | ||
79 | if (put_user(ur_block, p)) | |
80 | error = -EFAULT; | |
81 | ||
82 | return error; | |
aa81a7c7 EZ |
83 | } |
84 | ||
c4b929b8 MF |
85 | /** |
86 | * fiemap_fill_next_extent - Fiemap helper function | |
87 | * @fieinfo: Fiemap context passed into ->fiemap | |
88 | * @logical: Extent logical start offset, in bytes | |
89 | * @phys: Extent physical start offset, in bytes | |
90 | * @len: Extent length, in bytes | |
91 | * @flags: FIEMAP_EXTENT flags that describe this extent | |
92 | * | |
93 | * Called from file system ->fiemap callback. Will populate extent | |
94 | * info as passed in via arguments and copy to user memory. On | |
95 | * success, extent count on fieinfo is incremented. | |
96 | * | |
97 | * Returns 0 on success, -errno on error, 1 if this was the last | |
98 | * extent that will fit in user array. | |
99 | */ | |
100 | #define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC) | |
101 | #define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED) | |
102 | #define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE) | |
103 | int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical, | |
104 | u64 phys, u64 len, u32 flags) | |
105 | { | |
106 | struct fiemap_extent extent; | |
ecf5632d | 107 | struct fiemap_extent __user *dest = fieinfo->fi_extents_start; |
c4b929b8 MF |
108 | |
109 | /* only count the extents */ | |
110 | if (fieinfo->fi_extents_max == 0) { | |
111 | fieinfo->fi_extents_mapped++; | |
112 | return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; | |
113 | } | |
114 | ||
115 | if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max) | |
116 | return 1; | |
117 | ||
118 | if (flags & SET_UNKNOWN_FLAGS) | |
119 | flags |= FIEMAP_EXTENT_UNKNOWN; | |
120 | if (flags & SET_NO_UNMOUNTED_IO_FLAGS) | |
121 | flags |= FIEMAP_EXTENT_ENCODED; | |
122 | if (flags & SET_NOT_ALIGNED_FLAGS) | |
123 | flags |= FIEMAP_EXTENT_NOT_ALIGNED; | |
124 | ||
125 | memset(&extent, 0, sizeof(extent)); | |
126 | extent.fe_logical = logical; | |
127 | extent.fe_physical = phys; | |
128 | extent.fe_length = len; | |
129 | extent.fe_flags = flags; | |
130 | ||
131 | dest += fieinfo->fi_extents_mapped; | |
132 | if (copy_to_user(dest, &extent, sizeof(extent))) | |
133 | return -EFAULT; | |
134 | ||
135 | fieinfo->fi_extents_mapped++; | |
136 | if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max) | |
137 | return 1; | |
138 | return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; | |
139 | } | |
140 | EXPORT_SYMBOL(fiemap_fill_next_extent); | |
141 | ||
142 | /** | |
143 | * fiemap_check_flags - check validity of requested flags for fiemap | |
144 | * @fieinfo: Fiemap context passed into ->fiemap | |
145 | * @fs_flags: Set of fiemap flags that the file system understands | |
146 | * | |
147 | * Called from file system ->fiemap callback. This will compute the | |
148 | * intersection of valid fiemap flags and those that the fs supports. That | |
149 | * value is then compared against the user supplied flags. In case of bad user | |
150 | * flags, the invalid values will be written into the fieinfo structure, and | |
151 | * -EBADR is returned, which tells ioctl_fiemap() to return those values to | |
152 | * userspace. For this reason, a return code of -EBADR should be preserved. | |
153 | * | |
154 | * Returns 0 on success, -EBADR on bad flags. | |
155 | */ | |
156 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags) | |
157 | { | |
158 | u32 incompat_flags; | |
159 | ||
160 | incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags); | |
161 | if (incompat_flags) { | |
162 | fieinfo->fi_flags = incompat_flags; | |
163 | return -EBADR; | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | EXPORT_SYMBOL(fiemap_check_flags); | |
168 | ||
169 | static int fiemap_check_ranges(struct super_block *sb, | |
170 | u64 start, u64 len, u64 *new_len) | |
171 | { | |
5aa98b70 JL |
172 | u64 maxbytes = (u64) sb->s_maxbytes; |
173 | ||
c4b929b8 MF |
174 | *new_len = len; |
175 | ||
176 | if (len == 0) | |
177 | return -EINVAL; | |
178 | ||
5aa98b70 | 179 | if (start > maxbytes) |
c4b929b8 MF |
180 | return -EFBIG; |
181 | ||
182 | /* | |
183 | * Shrink request scope to what the fs can actually handle. | |
184 | */ | |
5aa98b70 JL |
185 | if (len > maxbytes || (maxbytes - len) < start) |
186 | *new_len = maxbytes - start; | |
c4b929b8 MF |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
34d3d0e6 | 191 | static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap) |
c4b929b8 MF |
192 | { |
193 | struct fiemap fiemap; | |
194 | struct fiemap_extent_info fieinfo = { 0, }; | |
496ad9aa | 195 | struct inode *inode = file_inode(filp); |
c4b929b8 MF |
196 | struct super_block *sb = inode->i_sb; |
197 | u64 len; | |
198 | int error; | |
199 | ||
200 | if (!inode->i_op->fiemap) | |
201 | return -EOPNOTSUPP; | |
202 | ||
ecf5632d | 203 | if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) |
c4b929b8 MF |
204 | return -EFAULT; |
205 | ||
206 | if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) | |
207 | return -EINVAL; | |
208 | ||
209 | error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length, | |
210 | &len); | |
211 | if (error) | |
212 | return error; | |
213 | ||
214 | fieinfo.fi_flags = fiemap.fm_flags; | |
215 | fieinfo.fi_extents_max = fiemap.fm_extent_count; | |
ecf5632d | 216 | fieinfo.fi_extents_start = ufiemap->fm_extents; |
c4b929b8 MF |
217 | |
218 | if (fiemap.fm_extent_count != 0 && | |
96d4f267 | 219 | !access_ok(fieinfo.fi_extents_start, |
c4b929b8 MF |
220 | fieinfo.fi_extents_max * sizeof(struct fiemap_extent))) |
221 | return -EFAULT; | |
222 | ||
223 | if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC) | |
224 | filemap_write_and_wait(inode->i_mapping); | |
225 | ||
226 | error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len); | |
227 | fiemap.fm_flags = fieinfo.fi_flags; | |
228 | fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; | |
ecf5632d | 229 | if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap))) |
c4b929b8 MF |
230 | error = -EFAULT; |
231 | ||
232 | return error; | |
233 | } | |
234 | ||
04b38d60 CH |
235 | static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd, |
236 | u64 off, u64 olen, u64 destoff) | |
237 | { | |
238 | struct fd src_file = fdget(srcfd); | |
42ec3d4c | 239 | loff_t cloned; |
04b38d60 CH |
240 | int ret; |
241 | ||
242 | if (!src_file.file) | |
243 | return -EBADF; | |
913b86e9 AG |
244 | ret = -EXDEV; |
245 | if (src_file.file->f_path.mnt != dst_file->f_path.mnt) | |
246 | goto fdput; | |
42ec3d4c | 247 | cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff, |
452ce659 | 248 | olen, 0); |
42ec3d4c DW |
249 | if (cloned < 0) |
250 | ret = cloned; | |
251 | else if (olen && cloned != olen) | |
252 | ret = -EINVAL; | |
253 | else | |
254 | ret = 0; | |
913b86e9 | 255 | fdput: |
04b38d60 CH |
256 | fdput(src_file); |
257 | return ret; | |
258 | } | |
259 | ||
34d3d0e6 AV |
260 | static long ioctl_file_clone_range(struct file *file, |
261 | struct file_clone_range __user *argp) | |
04b38d60 CH |
262 | { |
263 | struct file_clone_range args; | |
264 | ||
265 | if (copy_from_user(&args, argp, sizeof(args))) | |
266 | return -EFAULT; | |
267 | return ioctl_file_clone(file, args.src_fd, args.src_offset, | |
268 | args.src_length, args.dest_offset); | |
269 | } | |
270 | ||
06270d5d AB |
271 | #ifdef CONFIG_BLOCK |
272 | ||
3a3076f4 JB |
273 | static inline sector_t logical_to_blk(struct inode *inode, loff_t offset) |
274 | { | |
275 | return (offset >> inode->i_blkbits); | |
276 | } | |
277 | ||
278 | static inline loff_t blk_to_logical(struct inode *inode, sector_t blk) | |
279 | { | |
280 | return (blk << inode->i_blkbits); | |
281 | } | |
68c9d702 | 282 | |
e9079cce SW |
283 | /** |
284 | * __generic_block_fiemap - FIEMAP for block based inodes (no locking) | |
3a3076f4 JB |
285 | * @inode: the inode to map |
286 | * @fieinfo: the fiemap info struct that will be passed back to userspace | |
287 | * @start: where to start mapping in the inode | |
288 | * @len: how much space to map | |
289 | * @get_block: the fs's get_block function | |
68c9d702 JB |
290 | * |
291 | * This does FIEMAP for block based inodes. Basically it will just loop | |
292 | * through get_block until we hit the number of extents we want to map, or we | |
293 | * go past the end of the file and hit a hole. | |
294 | * | |
295 | * If it is possible to have data blocks beyond a hole past @inode->i_size, then | |
296 | * please do not use this function, it will stop at the first unmapped block | |
e9079cce SW |
297 | * beyond i_size. |
298 | * | |
299 | * If you use this function directly, you need to do your own locking. Use | |
300 | * generic_block_fiemap if you want the locking done for you. | |
68c9d702 | 301 | */ |
e9079cce SW |
302 | |
303 | int __generic_block_fiemap(struct inode *inode, | |
3a3076f4 JB |
304 | struct fiemap_extent_info *fieinfo, loff_t start, |
305 | loff_t len, get_block_t *get_block) | |
68c9d702 | 306 | { |
3a3076f4 JB |
307 | struct buffer_head map_bh; |
308 | sector_t start_blk, last_blk; | |
309 | loff_t isize = i_size_read(inode); | |
68c9d702 JB |
310 | u64 logical = 0, phys = 0, size = 0; |
311 | u32 flags = FIEMAP_EXTENT_MERGED; | |
3a3076f4 JB |
312 | bool past_eof = false, whole_file = false; |
313 | int ret = 0; | |
68c9d702 | 314 | |
3a3076f4 JB |
315 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); |
316 | if (ret) | |
68c9d702 JB |
317 | return ret; |
318 | ||
3a3076f4 JB |
319 | /* |
320 | * Either the i_mutex or other appropriate locking needs to be held | |
321 | * since we expect isize to not change at all through the duration of | |
322 | * this call. | |
323 | */ | |
324 | if (len >= isize) { | |
325 | whole_file = true; | |
326 | len = isize; | |
327 | } | |
df3935ff | 328 | |
d54cdc8c JB |
329 | /* |
330 | * Some filesystems can't deal with being asked to map less than | |
331 | * blocksize, so make sure our len is at least block length. | |
332 | */ | |
333 | if (logical_to_blk(inode, len) == 0) | |
334 | len = blk_to_logical(inode, 1); | |
335 | ||
3a3076f4 JB |
336 | start_blk = logical_to_blk(inode, start); |
337 | last_blk = logical_to_blk(inode, start + len - 1); | |
68c9d702 JB |
338 | |
339 | do { | |
340 | /* | |
341 | * we set b_size to the total size we want so it will map as | |
342 | * many contiguous blocks as possible at once | |
343 | */ | |
3a3076f4 JB |
344 | memset(&map_bh, 0, sizeof(struct buffer_head)); |
345 | map_bh.b_size = len; | |
68c9d702 | 346 | |
3a3076f4 | 347 | ret = get_block(inode, start_blk, &map_bh, 0); |
68c9d702 JB |
348 | if (ret) |
349 | break; | |
350 | ||
351 | /* HOLE */ | |
3a3076f4 | 352 | if (!buffer_mapped(&map_bh)) { |
df3935ff JB |
353 | start_blk++; |
354 | ||
355 | /* | |
3a3076f4 | 356 | * We want to handle the case where there is an |
df3935ff JB |
357 | * allocated block at the front of the file, and then |
358 | * nothing but holes up to the end of the file properly, | |
359 | * to make sure that extent at the front gets properly | |
360 | * marked with FIEMAP_EXTENT_LAST | |
361 | */ | |
362 | if (!past_eof && | |
3a3076f4 | 363 | blk_to_logical(inode, start_blk) >= isize) |
df3935ff JB |
364 | past_eof = 1; |
365 | ||
68c9d702 | 366 | /* |
3a3076f4 | 367 | * First hole after going past the EOF, this is our |
68c9d702 JB |
368 | * last extent |
369 | */ | |
df3935ff | 370 | if (past_eof && size) { |
68c9d702 JB |
371 | flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST; |
372 | ret = fiemap_fill_next_extent(fieinfo, logical, | |
373 | phys, size, | |
374 | flags); | |
3a3076f4 JB |
375 | } else if (size) { |
376 | ret = fiemap_fill_next_extent(fieinfo, logical, | |
377 | phys, size, flags); | |
378 | size = 0; | |
68c9d702 JB |
379 | } |
380 | ||
68c9d702 | 381 | /* if we have holes up to/past EOF then we're done */ |
3a3076f4 | 382 | if (start_blk > last_blk || past_eof || ret) |
68c9d702 | 383 | break; |
68c9d702 | 384 | } else { |
df3935ff | 385 | /* |
3a3076f4 | 386 | * We have gone over the length of what we wanted to |
df3935ff JB |
387 | * map, and it wasn't the entire file, so add the extent |
388 | * we got last time and exit. | |
389 | * | |
390 | * This is for the case where say we want to map all the | |
391 | * way up to the second to the last block in a file, but | |
392 | * the last block is a hole, making the second to last | |
393 | * block FIEMAP_EXTENT_LAST. In this case we want to | |
394 | * see if there is a hole after the second to last block | |
395 | * so we can mark it properly. If we found data after | |
396 | * we exceeded the length we were requesting, then we | |
397 | * are good to go, just add the extent to the fieinfo | |
398 | * and break | |
399 | */ | |
3a3076f4 | 400 | if (start_blk > last_blk && !whole_file) { |
df3935ff JB |
401 | ret = fiemap_fill_next_extent(fieinfo, logical, |
402 | phys, size, | |
403 | flags); | |
404 | break; | |
405 | } | |
406 | ||
407 | /* | |
408 | * if size != 0 then we know we already have an extent | |
409 | * to add, so add it. | |
410 | */ | |
411 | if (size) { | |
68c9d702 JB |
412 | ret = fiemap_fill_next_extent(fieinfo, logical, |
413 | phys, size, | |
414 | flags); | |
415 | if (ret) | |
416 | break; | |
417 | } | |
418 | ||
419 | logical = blk_to_logical(inode, start_blk); | |
3a3076f4 JB |
420 | phys = blk_to_logical(inode, map_bh.b_blocknr); |
421 | size = map_bh.b_size; | |
68c9d702 JB |
422 | flags = FIEMAP_EXTENT_MERGED; |
423 | ||
68c9d702 JB |
424 | start_blk += logical_to_blk(inode, size); |
425 | ||
426 | /* | |
df3935ff JB |
427 | * If we are past the EOF, then we need to make sure as |
428 | * soon as we find a hole that the last extent we found | |
429 | * is marked with FIEMAP_EXTENT_LAST | |
68c9d702 | 430 | */ |
3a3076f4 JB |
431 | if (!past_eof && logical + size >= isize) |
432 | past_eof = true; | |
68c9d702 JB |
433 | } |
434 | cond_resched(); | |
913e027c DM |
435 | if (fatal_signal_pending(current)) { |
436 | ret = -EINTR; | |
437 | break; | |
438 | } | |
439 | ||
68c9d702 JB |
440 | } while (1); |
441 | ||
3a3076f4 | 442 | /* If ret is 1 then we just hit the end of the extent array */ |
68c9d702 JB |
443 | if (ret == 1) |
444 | ret = 0; | |
445 | ||
446 | return ret; | |
447 | } | |
e9079cce SW |
448 | EXPORT_SYMBOL(__generic_block_fiemap); |
449 | ||
450 | /** | |
451 | * generic_block_fiemap - FIEMAP for block based inodes | |
452 | * @inode: The inode to map | |
453 | * @fieinfo: The mapping information | |
454 | * @start: The initial block to map | |
455 | * @len: The length of the extect to attempt to map | |
456 | * @get_block: The block mapping function for the fs | |
457 | * | |
458 | * Calls __generic_block_fiemap to map the inode, after taking | |
459 | * the inode's mutex lock. | |
460 | */ | |
461 | ||
462 | int generic_block_fiemap(struct inode *inode, | |
463 | struct fiemap_extent_info *fieinfo, u64 start, | |
464 | u64 len, get_block_t *get_block) | |
465 | { | |
466 | int ret; | |
5955102c | 467 | inode_lock(inode); |
e9079cce | 468 | ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block); |
5955102c | 469 | inode_unlock(inode); |
e9079cce SW |
470 | return ret; |
471 | } | |
68c9d702 JB |
472 | EXPORT_SYMBOL(generic_block_fiemap); |
473 | ||
06270d5d AB |
474 | #endif /* CONFIG_BLOCK */ |
475 | ||
3e63cbb1 AJ |
476 | /* |
477 | * This provides compatibility with legacy XFS pre-allocation ioctls | |
478 | * which predate the fallocate syscall. | |
479 | * | |
480 | * Only the l_start, l_len and l_whence fields of the 'struct space_resv' | |
481 | * are used here, rest are ignored. | |
482 | */ | |
77b90401 | 483 | static int ioctl_preallocate(struct file *filp, int mode, void __user *argp) |
3e63cbb1 | 484 | { |
496ad9aa | 485 | struct inode *inode = file_inode(filp); |
3e63cbb1 AJ |
486 | struct space_resv sr; |
487 | ||
488 | if (copy_from_user(&sr, argp, sizeof(sr))) | |
489 | return -EFAULT; | |
490 | ||
491 | switch (sr.l_whence) { | |
492 | case SEEK_SET: | |
493 | break; | |
494 | case SEEK_CUR: | |
495 | sr.l_start += filp->f_pos; | |
496 | break; | |
497 | case SEEK_END: | |
498 | sr.l_start += i_size_read(inode); | |
499 | break; | |
500 | default: | |
501 | return -EINVAL; | |
502 | } | |
503 | ||
837a6e7f CH |
504 | return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, |
505 | sr.l_len); | |
3e63cbb1 AJ |
506 | } |
507 | ||
011da44b AV |
508 | /* on ia32 l_start is on a 32-bit boundary */ |
509 | #if defined CONFIG_COMPAT && defined(CONFIG_X86_64) | |
510 | /* just account for different alignment */ | |
77b90401 AB |
511 | static int compat_ioctl_preallocate(struct file *file, int mode, |
512 | struct space_resv_32 __user *argp) | |
011da44b AV |
513 | { |
514 | struct inode *inode = file_inode(file); | |
515 | struct space_resv_32 sr; | |
516 | ||
517 | if (copy_from_user(&sr, argp, sizeof(sr))) | |
518 | return -EFAULT; | |
519 | ||
520 | switch (sr.l_whence) { | |
521 | case SEEK_SET: | |
522 | break; | |
523 | case SEEK_CUR: | |
524 | sr.l_start += file->f_pos; | |
525 | break; | |
526 | case SEEK_END: | |
527 | sr.l_start += i_size_read(inode); | |
528 | break; | |
529 | default: | |
530 | return -EINVAL; | |
531 | } | |
532 | ||
97eeb4d9 | 533 | return vfs_fallocate(file, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len); |
011da44b AV |
534 | } |
535 | #endif | |
536 | ||
77b90401 | 537 | static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p) |
1da177e4 | 538 | { |
1da177e4 | 539 | switch (cmd) { |
c9845ff1 | 540 | case FIBMAP: |
aa81a7c7 | 541 | return ioctl_fibmap(filp, p); |
3e63cbb1 AJ |
542 | case FS_IOC_RESVSP: |
543 | case FS_IOC_RESVSP64: | |
837a6e7f CH |
544 | return ioctl_preallocate(filp, 0, p); |
545 | case FS_IOC_UNRESVSP: | |
546 | case FS_IOC_UNRESVSP64: | |
547 | return ioctl_preallocate(filp, FALLOC_FL_PUNCH_HOLE, p); | |
548 | case FS_IOC_ZERO_RANGE: | |
549 | return ioctl_preallocate(filp, FALLOC_FL_ZERO_RANGE, p); | |
1da177e4 LT |
550 | } |
551 | ||
77b90401 | 552 | return -ENOIOCTLCMD; |
1da177e4 LT |
553 | } |
554 | ||
aa81a7c7 EZ |
555 | static int ioctl_fionbio(struct file *filp, int __user *argp) |
556 | { | |
557 | unsigned int flag; | |
558 | int on, error; | |
559 | ||
560 | error = get_user(on, argp); | |
561 | if (error) | |
562 | return error; | |
563 | flag = O_NONBLOCK; | |
564 | #ifdef __sparc__ | |
565 | /* SunOS compatibility item. */ | |
566 | if (O_NONBLOCK != O_NDELAY) | |
567 | flag |= O_NDELAY; | |
568 | #endif | |
db1dd4d3 | 569 | spin_lock(&filp->f_lock); |
aa81a7c7 EZ |
570 | if (on) |
571 | filp->f_flags |= flag; | |
572 | else | |
573 | filp->f_flags &= ~flag; | |
db1dd4d3 | 574 | spin_unlock(&filp->f_lock); |
aa81a7c7 EZ |
575 | return error; |
576 | } | |
577 | ||
578 | static int ioctl_fioasync(unsigned int fd, struct file *filp, | |
579 | int __user *argp) | |
580 | { | |
581 | unsigned int flag; | |
582 | int on, error; | |
583 | ||
584 | error = get_user(on, argp); | |
585 | if (error) | |
586 | return error; | |
587 | flag = on ? FASYNC : 0; | |
588 | ||
589 | /* Did FASYNC state change ? */ | |
590 | if ((flag ^ filp->f_flags) & FASYNC) { | |
72c2d531 | 591 | if (filp->f_op->fasync) |
76398425 | 592 | /* fasync() adjusts filp->f_flags */ |
aa81a7c7 | 593 | error = filp->f_op->fasync(fd, filp, on); |
218d11a8 | 594 | else |
aa81a7c7 EZ |
595 | error = -ENOTTY; |
596 | } | |
60aa4924 | 597 | return error < 0 ? error : 0; |
aa81a7c7 EZ |
598 | } |
599 | ||
fcccf502 TS |
600 | static int ioctl_fsfreeze(struct file *filp) |
601 | { | |
496ad9aa | 602 | struct super_block *sb = file_inode(filp)->i_sb; |
fcccf502 | 603 | |
f3f1a183 | 604 | if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) |
fcccf502 TS |
605 | return -EPERM; |
606 | ||
607 | /* If filesystem doesn't support freeze feature, return. */ | |
48b6bca6 | 608 | if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL) |
fcccf502 TS |
609 | return -EOPNOTSUPP; |
610 | ||
fcccf502 | 611 | /* Freeze */ |
48b6bca6 BM |
612 | if (sb->s_op->freeze_super) |
613 | return sb->s_op->freeze_super(sb); | |
18e9e510 | 614 | return freeze_super(sb); |
fcccf502 TS |
615 | } |
616 | ||
617 | static int ioctl_fsthaw(struct file *filp) | |
618 | { | |
496ad9aa | 619 | struct super_block *sb = file_inode(filp)->i_sb; |
fcccf502 | 620 | |
f3f1a183 | 621 | if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) |
fcccf502 TS |
622 | return -EPERM; |
623 | ||
fcccf502 | 624 | /* Thaw */ |
48b6bca6 BM |
625 | if (sb->s_op->thaw_super) |
626 | return sb->s_op->thaw_super(sb); | |
18e9e510 | 627 | return thaw_super(sb); |
fcccf502 TS |
628 | } |
629 | ||
34d3d0e6 AV |
630 | static int ioctl_file_dedupe_range(struct file *file, |
631 | struct file_dedupe_range __user *argp) | |
54dbc151 | 632 | { |
54dbc151 DW |
633 | struct file_dedupe_range *same = NULL; |
634 | int ret; | |
635 | unsigned long size; | |
636 | u16 count; | |
637 | ||
638 | if (get_user(count, &argp->dest_count)) { | |
639 | ret = -EFAULT; | |
640 | goto out; | |
641 | } | |
642 | ||
643 | size = offsetof(struct file_dedupe_range __user, info[count]); | |
b71dbf10 DW |
644 | if (size > PAGE_SIZE) { |
645 | ret = -ENOMEM; | |
646 | goto out; | |
647 | } | |
54dbc151 DW |
648 | |
649 | same = memdup_user(argp, size); | |
650 | if (IS_ERR(same)) { | |
651 | ret = PTR_ERR(same); | |
652 | same = NULL; | |
653 | goto out; | |
654 | } | |
655 | ||
10eec60c | 656 | same->dest_count = count; |
54dbc151 DW |
657 | ret = vfs_dedupe_file_range(file, same); |
658 | if (ret) | |
659 | goto out; | |
660 | ||
661 | ret = copy_to_user(argp, same, size); | |
662 | if (ret) | |
663 | ret = -EFAULT; | |
664 | ||
665 | out: | |
666 | kfree(same); | |
667 | return ret; | |
668 | } | |
669 | ||
1da177e4 | 670 | /* |
deb21db7 | 671 | * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. |
1da177e4 | 672 | * It's just a simple helper for sys_ioctl and compat_sys_ioctl. |
77b90401 AB |
673 | * |
674 | * When you add any new common ioctls to the switches above and below, | |
675 | * please ensure they have compatible arguments in compat mode. | |
1da177e4 | 676 | */ |
77b90401 AB |
677 | static int do_vfs_ioctl(struct file *filp, unsigned int fd, |
678 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 679 | { |
34d3d0e6 | 680 | void __user *argp = (void __user *)arg; |
496ad9aa | 681 | struct inode *inode = file_inode(filp); |
1da177e4 LT |
682 | |
683 | switch (cmd) { | |
c9845ff1 EZ |
684 | case FIOCLEX: |
685 | set_close_on_exec(fd, 1); | |
77b90401 | 686 | return 0; |
1da177e4 | 687 | |
c9845ff1 EZ |
688 | case FIONCLEX: |
689 | set_close_on_exec(fd, 0); | |
77b90401 | 690 | return 0; |
1da177e4 | 691 | |
c9845ff1 | 692 | case FIONBIO: |
77b90401 | 693 | return ioctl_fionbio(filp, argp); |
c9845ff1 EZ |
694 | |
695 | case FIOASYNC: | |
77b90401 | 696 | return ioctl_fioasync(fd, filp, argp); |
c9845ff1 EZ |
697 | |
698 | case FIOQSIZE: | |
27a4f7e6 NK |
699 | if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) || |
700 | S_ISLNK(inode->i_mode)) { | |
701 | loff_t res = inode_get_bytes(inode); | |
77b90401 AB |
702 | return copy_to_user(argp, &res, sizeof(res)) ? |
703 | -EFAULT : 0; | |
704 | } | |
705 | ||
706 | return -ENOTTY; | |
fcccf502 TS |
707 | |
708 | case FIFREEZE: | |
77b90401 | 709 | return ioctl_fsfreeze(filp); |
fcccf502 TS |
710 | |
711 | case FITHAW: | |
77b90401 | 712 | return ioctl_fsthaw(filp); |
fcccf502 | 713 | |
19ba0559 | 714 | case FS_IOC_FIEMAP: |
34d3d0e6 | 715 | return ioctl_fiemap(filp, argp); |
19ba0559 AK |
716 | |
717 | case FIGETBSZ: | |
8f97d1e9 AG |
718 | /* anon_bdev filesystems may not have a block size */ |
719 | if (!inode->i_sb->s_blocksize) | |
720 | return -EINVAL; | |
77b90401 | 721 | |
34d3d0e6 | 722 | return put_user(inode->i_sb->s_blocksize, (int __user *)argp); |
19ba0559 | 723 | |
04b38d60 CH |
724 | case FICLONE: |
725 | return ioctl_file_clone(filp, arg, 0, 0, 0); | |
726 | ||
727 | case FICLONERANGE: | |
728 | return ioctl_file_clone_range(filp, argp); | |
729 | ||
54dbc151 DW |
730 | case FIDEDUPERANGE: |
731 | return ioctl_file_dedupe_range(filp, argp); | |
732 | ||
0a061743 AB |
733 | case FIONREAD: |
734 | if (!S_ISREG(inode->i_mode)) | |
735 | return vfs_ioctl(filp, cmd, arg); | |
736 | ||
737 | return put_user(i_size_read(inode) - filp->f_pos, | |
738 | (int __user *)argp); | |
739 | ||
c9845ff1 | 740 | default: |
27a4f7e6 | 741 | if (S_ISREG(inode->i_mode)) |
77b90401 | 742 | return file_ioctl(filp, cmd, argp); |
c9845ff1 | 743 | break; |
1da177e4 | 744 | } |
77b90401 AB |
745 | |
746 | return -ENOIOCTLCMD; | |
1da177e4 LT |
747 | } |
748 | ||
cbb60b92 | 749 | int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg) |
1da177e4 | 750 | { |
2903ff01 | 751 | struct fd f = fdget(fd); |
77b90401 | 752 | int error; |
2903ff01 AV |
753 | |
754 | if (!f.file) | |
755 | return -EBADF; | |
77b90401 | 756 | |
2903ff01 | 757 | error = security_file_ioctl(f.file, cmd, arg); |
77b90401 AB |
758 | if (error) |
759 | goto out; | |
760 | ||
761 | error = do_vfs_ioctl(f.file, fd, cmd, arg); | |
762 | if (error == -ENOIOCTLCMD) | |
763 | error = vfs_ioctl(f.file, cmd, arg); | |
764 | ||
765 | out: | |
2903ff01 | 766 | fdput(f); |
1da177e4 LT |
767 | return error; |
768 | } | |
cbb60b92 DB |
769 | |
770 | SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) | |
771 | { | |
772 | return ksys_ioctl(fd, cmd, arg); | |
773 | } | |
2952db0f AB |
774 | |
775 | #ifdef CONFIG_COMPAT | |
776 | /** | |
777 | * compat_ptr_ioctl - generic implementation of .compat_ioctl file operation | |
778 | * | |
779 | * This is not normally called as a function, but instead set in struct | |
780 | * file_operations as | |
781 | * | |
782 | * .compat_ioctl = compat_ptr_ioctl, | |
783 | * | |
784 | * On most architectures, the compat_ptr_ioctl() just passes all arguments | |
785 | * to the corresponding ->ioctl handler. The exception is arch/s390, where | |
786 | * compat_ptr() clears the top bit of a 32-bit pointer value, so user space | |
787 | * pointers to the second 2GB alias the first 2GB, as is the case for | |
788 | * native 32-bit s390 user space. | |
789 | * | |
790 | * The compat_ptr_ioctl() function must therefore be used only with ioctl | |
791 | * functions that either ignore the argument or pass a pointer to a | |
792 | * compatible data type. | |
793 | * | |
794 | * If any ioctl command handled by fops->unlocked_ioctl passes a plain | |
795 | * integer instead of a pointer, or any of the passed data types | |
796 | * is incompatible between 32-bit and 64-bit architectures, a proper | |
797 | * handler is required instead of compat_ptr_ioctl. | |
798 | */ | |
799 | long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
800 | { | |
801 | if (!file->f_op->unlocked_ioctl) | |
802 | return -ENOIOCTLCMD; | |
803 | ||
804 | return file->f_op->unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
805 | } | |
806 | EXPORT_SYMBOL(compat_ptr_ioctl); | |
2af563d0 AB |
807 | |
808 | COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, | |
77b90401 | 809 | compat_ulong_t, arg) |
2af563d0 | 810 | { |
2af563d0 | 811 | struct fd f = fdget(fd); |
77b90401 AB |
812 | int error; |
813 | ||
2af563d0 | 814 | if (!f.file) |
77b90401 | 815 | return -EBADF; |
2af563d0 AB |
816 | |
817 | /* RED-PEN how should LSM module know it's handling 32bit? */ | |
818 | error = security_file_ioctl(f.file, cmd, arg); | |
819 | if (error) | |
77b90401 | 820 | goto out; |
2af563d0 AB |
821 | |
822 | switch (cmd) { | |
77b90401 | 823 | /* FICLONE takes an int argument, so don't use compat_ptr() */ |
2af563d0 | 824 | case FICLONE: |
77b90401 AB |
825 | error = ioctl_file_clone(f.file, arg, 0, 0, 0); |
826 | break; | |
827 | ||
2af563d0 | 828 | #if defined(CONFIG_X86_64) |
77b90401 | 829 | /* these get messy on amd64 due to alignment differences */ |
2af563d0 AB |
830 | case FS_IOC_RESVSP_32: |
831 | case FS_IOC_RESVSP64_32: | |
832 | error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg)); | |
77b90401 | 833 | break; |
2af563d0 AB |
834 | case FS_IOC_UNRESVSP_32: |
835 | case FS_IOC_UNRESVSP64_32: | |
836 | error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE, | |
837 | compat_ptr(arg)); | |
77b90401 | 838 | break; |
2af563d0 AB |
839 | case FS_IOC_ZERO_RANGE_32: |
840 | error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE, | |
841 | compat_ptr(arg)); | |
77b90401 | 842 | break; |
2af563d0 AB |
843 | #endif |
844 | ||
77b90401 AB |
845 | /* |
846 | * everything else in do_vfs_ioctl() takes either a compatible | |
847 | * pointer argument or no argument -- call it with a modified | |
848 | * argument. | |
849 | */ | |
2af563d0 | 850 | default: |
77b90401 AB |
851 | error = do_vfs_ioctl(f.file, fd, cmd, |
852 | (unsigned long)compat_ptr(arg)); | |
853 | if (error != -ENOIOCTLCMD) | |
854 | break; | |
855 | ||
856 | if (f.file->f_op->compat_ioctl) | |
2af563d0 | 857 | error = f.file->f_op->compat_ioctl(f.file, cmd, arg); |
77b90401 AB |
858 | if (error == -ENOIOCTLCMD) |
859 | error = -ENOTTY; | |
860 | break; | |
2af563d0 AB |
861 | } |
862 | ||
2af563d0 | 863 | out: |
77b90401 AB |
864 | fdput(f); |
865 | ||
2af563d0 AB |
866 | return error; |
867 | } | |
2952db0f | 868 | #endif |