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