Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ioctl.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/syscalls.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/smp_lock.h> | |
16f7e0fe | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/file.h> |
12 | #include <linux/fs.h> | |
13 | #include <linux/security.h> | |
14 | #include <linux/module.h> | |
c9845ff1 | 15 | #include <linux/uaccess.h> |
68c9d702 JB |
16 | #include <linux/writeback.h> |
17 | #include <linux/buffer_head.h> | |
3e63cbb1 | 18 | #include <linux/falloc.h> |
1da177e4 | 19 | |
1da177e4 LT |
20 | #include <asm/ioctls.h> |
21 | ||
c4b929b8 MF |
22 | /* So that the fiemap access checks can't overflow on 32 bit machines. */ |
23 | #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) | |
24 | ||
deb21db7 EZ |
25 | /** |
26 | * vfs_ioctl - call filesystem specific ioctl methods | |
f6a4c8bd CH |
27 | * @filp: open file to invoke ioctl method on |
28 | * @cmd: ioctl command to execute | |
29 | * @arg: command-specific argument for ioctl | |
deb21db7 EZ |
30 | * |
31 | * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise | |
f6a4c8bd | 32 | * invokes filesystem specific ->ioctl method. If neither method exists, |
deb21db7 EZ |
33 | * returns -ENOTTY. |
34 | * | |
35 | * Returns 0 on success, -errno on error. | |
36 | */ | |
67cde595 AB |
37 | static long vfs_ioctl(struct file *filp, unsigned int cmd, |
38 | unsigned long arg) | |
1da177e4 LT |
39 | { |
40 | int error = -ENOTTY; | |
41 | ||
42 | if (!filp->f_op) | |
43 | goto out; | |
44 | ||
45 | if (filp->f_op->unlocked_ioctl) { | |
46 | error = filp->f_op->unlocked_ioctl(filp, cmd, arg); | |
47 | if (error == -ENOIOCTLCMD) | |
48 | error = -EINVAL; | |
49 | goto out; | |
64d67d21 | 50 | } else if (filp->f_op->ioctl) { |
1da177e4 | 51 | lock_kernel(); |
64d67d21 AM |
52 | error = filp->f_op->ioctl(filp->f_path.dentry->d_inode, |
53 | filp, cmd, arg); | |
1da177e4 LT |
54 | unlock_kernel(); |
55 | } | |
56 | ||
57 | out: | |
58 | return error; | |
59 | } | |
60 | ||
aa81a7c7 EZ |
61 | static int ioctl_fibmap(struct file *filp, int __user *p) |
62 | { | |
63 | struct address_space *mapping = filp->f_mapping; | |
64 | int res, block; | |
65 | ||
66 | /* do we support this mess? */ | |
67 | if (!mapping->a_ops->bmap) | |
68 | return -EINVAL; | |
69 | if (!capable(CAP_SYS_RAWIO)) | |
70 | return -EPERM; | |
71 | res = get_user(block, p); | |
72 | if (res) | |
73 | return res; | |
aa81a7c7 | 74 | res = mapping->a_ops->bmap(mapping, block); |
aa81a7c7 EZ |
75 | return put_user(res, p); |
76 | } | |
77 | ||
c4b929b8 MF |
78 | /** |
79 | * fiemap_fill_next_extent - Fiemap helper function | |
80 | * @fieinfo: Fiemap context passed into ->fiemap | |
81 | * @logical: Extent logical start offset, in bytes | |
82 | * @phys: Extent physical start offset, in bytes | |
83 | * @len: Extent length, in bytes | |
84 | * @flags: FIEMAP_EXTENT flags that describe this extent | |
85 | * | |
86 | * Called from file system ->fiemap callback. Will populate extent | |
87 | * info as passed in via arguments and copy to user memory. On | |
88 | * success, extent count on fieinfo is incremented. | |
89 | * | |
90 | * Returns 0 on success, -errno on error, 1 if this was the last | |
91 | * extent that will fit in user array. | |
92 | */ | |
93 | #define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC) | |
94 | #define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED) | |
95 | #define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE) | |
96 | int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical, | |
97 | u64 phys, u64 len, u32 flags) | |
98 | { | |
99 | struct fiemap_extent extent; | |
100 | struct fiemap_extent *dest = fieinfo->fi_extents_start; | |
101 | ||
102 | /* only count the extents */ | |
103 | if (fieinfo->fi_extents_max == 0) { | |
104 | fieinfo->fi_extents_mapped++; | |
105 | return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; | |
106 | } | |
107 | ||
108 | if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max) | |
109 | return 1; | |
110 | ||
111 | if (flags & SET_UNKNOWN_FLAGS) | |
112 | flags |= FIEMAP_EXTENT_UNKNOWN; | |
113 | if (flags & SET_NO_UNMOUNTED_IO_FLAGS) | |
114 | flags |= FIEMAP_EXTENT_ENCODED; | |
115 | if (flags & SET_NOT_ALIGNED_FLAGS) | |
116 | flags |= FIEMAP_EXTENT_NOT_ALIGNED; | |
117 | ||
118 | memset(&extent, 0, sizeof(extent)); | |
119 | extent.fe_logical = logical; | |
120 | extent.fe_physical = phys; | |
121 | extent.fe_length = len; | |
122 | extent.fe_flags = flags; | |
123 | ||
124 | dest += fieinfo->fi_extents_mapped; | |
125 | if (copy_to_user(dest, &extent, sizeof(extent))) | |
126 | return -EFAULT; | |
127 | ||
128 | fieinfo->fi_extents_mapped++; | |
129 | if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max) | |
130 | return 1; | |
131 | return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; | |
132 | } | |
133 | EXPORT_SYMBOL(fiemap_fill_next_extent); | |
134 | ||
135 | /** | |
136 | * fiemap_check_flags - check validity of requested flags for fiemap | |
137 | * @fieinfo: Fiemap context passed into ->fiemap | |
138 | * @fs_flags: Set of fiemap flags that the file system understands | |
139 | * | |
140 | * Called from file system ->fiemap callback. This will compute the | |
141 | * intersection of valid fiemap flags and those that the fs supports. That | |
142 | * value is then compared against the user supplied flags. In case of bad user | |
143 | * flags, the invalid values will be written into the fieinfo structure, and | |
144 | * -EBADR is returned, which tells ioctl_fiemap() to return those values to | |
145 | * userspace. For this reason, a return code of -EBADR should be preserved. | |
146 | * | |
147 | * Returns 0 on success, -EBADR on bad flags. | |
148 | */ | |
149 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags) | |
150 | { | |
151 | u32 incompat_flags; | |
152 | ||
153 | incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags); | |
154 | if (incompat_flags) { | |
155 | fieinfo->fi_flags = incompat_flags; | |
156 | return -EBADR; | |
157 | } | |
158 | return 0; | |
159 | } | |
160 | EXPORT_SYMBOL(fiemap_check_flags); | |
161 | ||
162 | static int fiemap_check_ranges(struct super_block *sb, | |
163 | u64 start, u64 len, u64 *new_len) | |
164 | { | |
5aa98b70 JL |
165 | u64 maxbytes = (u64) sb->s_maxbytes; |
166 | ||
c4b929b8 MF |
167 | *new_len = len; |
168 | ||
169 | if (len == 0) | |
170 | return -EINVAL; | |
171 | ||
5aa98b70 | 172 | if (start > maxbytes) |
c4b929b8 MF |
173 | return -EFBIG; |
174 | ||
175 | /* | |
176 | * Shrink request scope to what the fs can actually handle. | |
177 | */ | |
5aa98b70 JL |
178 | if (len > maxbytes || (maxbytes - len) < start) |
179 | *new_len = maxbytes - start; | |
c4b929b8 MF |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int ioctl_fiemap(struct file *filp, unsigned long arg) | |
185 | { | |
186 | struct fiemap fiemap; | |
187 | struct fiemap_extent_info fieinfo = { 0, }; | |
188 | struct inode *inode = filp->f_path.dentry->d_inode; | |
189 | struct super_block *sb = inode->i_sb; | |
190 | u64 len; | |
191 | int error; | |
192 | ||
193 | if (!inode->i_op->fiemap) | |
194 | return -EOPNOTSUPP; | |
195 | ||
196 | if (copy_from_user(&fiemap, (struct fiemap __user *)arg, | |
197 | sizeof(struct fiemap))) | |
198 | return -EFAULT; | |
199 | ||
200 | if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) | |
201 | return -EINVAL; | |
202 | ||
203 | error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length, | |
204 | &len); | |
205 | if (error) | |
206 | return error; | |
207 | ||
208 | fieinfo.fi_flags = fiemap.fm_flags; | |
209 | fieinfo.fi_extents_max = fiemap.fm_extent_count; | |
210 | fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap)); | |
211 | ||
212 | if (fiemap.fm_extent_count != 0 && | |
213 | !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start, | |
214 | fieinfo.fi_extents_max * sizeof(struct fiemap_extent))) | |
215 | return -EFAULT; | |
216 | ||
217 | if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC) | |
218 | filemap_write_and_wait(inode->i_mapping); | |
219 | ||
220 | error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len); | |
221 | fiemap.fm_flags = fieinfo.fi_flags; | |
222 | fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; | |
223 | if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap))) | |
224 | error = -EFAULT; | |
225 | ||
226 | return error; | |
227 | } | |
228 | ||
06270d5d AB |
229 | #ifdef CONFIG_BLOCK |
230 | ||
68c9d702 JB |
231 | #define blk_to_logical(inode, blk) (blk << (inode)->i_blkbits) |
232 | #define logical_to_blk(inode, offset) (offset >> (inode)->i_blkbits); | |
233 | ||
e9079cce SW |
234 | /** |
235 | * __generic_block_fiemap - FIEMAP for block based inodes (no locking) | |
68c9d702 JB |
236 | * @inode - the inode to map |
237 | * @arg - the pointer to userspace where we copy everything to | |
238 | * @get_block - the fs's get_block function | |
239 | * | |
240 | * This does FIEMAP for block based inodes. Basically it will just loop | |
241 | * through get_block until we hit the number of extents we want to map, or we | |
242 | * go past the end of the file and hit a hole. | |
243 | * | |
244 | * If it is possible to have data blocks beyond a hole past @inode->i_size, then | |
245 | * please do not use this function, it will stop at the first unmapped block | |
e9079cce SW |
246 | * beyond i_size. |
247 | * | |
248 | * If you use this function directly, you need to do your own locking. Use | |
249 | * generic_block_fiemap if you want the locking done for you. | |
68c9d702 | 250 | */ |
e9079cce SW |
251 | |
252 | int __generic_block_fiemap(struct inode *inode, | |
253 | struct fiemap_extent_info *fieinfo, u64 start, | |
254 | u64 len, get_block_t *get_block) | |
68c9d702 JB |
255 | { |
256 | struct buffer_head tmp; | |
e04b5ef8 | 257 | unsigned long long start_blk; |
68c9d702 JB |
258 | long long length = 0, map_len = 0; |
259 | u64 logical = 0, phys = 0, size = 0; | |
260 | u32 flags = FIEMAP_EXTENT_MERGED; | |
df3935ff | 261 | int ret = 0, past_eof = 0, whole_file = 0; |
68c9d702 JB |
262 | |
263 | if ((ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC))) | |
264 | return ret; | |
265 | ||
266 | start_blk = logical_to_blk(inode, start); | |
267 | ||
68c9d702 | 268 | length = (long long)min_t(u64, len, i_size_read(inode)); |
df3935ff JB |
269 | if (length < len) |
270 | whole_file = 1; | |
271 | ||
68c9d702 JB |
272 | map_len = length; |
273 | ||
274 | do { | |
275 | /* | |
276 | * we set b_size to the total size we want so it will map as | |
277 | * many contiguous blocks as possible at once | |
278 | */ | |
279 | memset(&tmp, 0, sizeof(struct buffer_head)); | |
280 | tmp.b_size = map_len; | |
281 | ||
282 | ret = get_block(inode, start_blk, &tmp, 0); | |
283 | if (ret) | |
284 | break; | |
285 | ||
286 | /* HOLE */ | |
287 | if (!buffer_mapped(&tmp)) { | |
df3935ff JB |
288 | length -= blk_to_logical(inode, 1); |
289 | start_blk++; | |
290 | ||
291 | /* | |
292 | * we want to handle the case where there is an | |
293 | * allocated block at the front of the file, and then | |
294 | * nothing but holes up to the end of the file properly, | |
295 | * to make sure that extent at the front gets properly | |
296 | * marked with FIEMAP_EXTENT_LAST | |
297 | */ | |
298 | if (!past_eof && | |
299 | blk_to_logical(inode, start_blk) >= | |
300 | blk_to_logical(inode, 0)+i_size_read(inode)) | |
301 | past_eof = 1; | |
302 | ||
68c9d702 JB |
303 | /* |
304 | * first hole after going past the EOF, this is our | |
305 | * last extent | |
306 | */ | |
df3935ff | 307 | if (past_eof && size) { |
68c9d702 JB |
308 | flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST; |
309 | ret = fiemap_fill_next_extent(fieinfo, logical, | |
310 | phys, size, | |
311 | flags); | |
312 | break; | |
313 | } | |
314 | ||
68c9d702 | 315 | /* if we have holes up to/past EOF then we're done */ |
df3935ff | 316 | if (length <= 0 || past_eof) |
68c9d702 | 317 | break; |
68c9d702 | 318 | } else { |
df3935ff JB |
319 | /* |
320 | * we have gone over the length of what we wanted to | |
321 | * map, and it wasn't the entire file, so add the extent | |
322 | * we got last time and exit. | |
323 | * | |
324 | * This is for the case where say we want to map all the | |
325 | * way up to the second to the last block in a file, but | |
326 | * the last block is a hole, making the second to last | |
327 | * block FIEMAP_EXTENT_LAST. In this case we want to | |
328 | * see if there is a hole after the second to last block | |
329 | * so we can mark it properly. If we found data after | |
330 | * we exceeded the length we were requesting, then we | |
331 | * are good to go, just add the extent to the fieinfo | |
332 | * and break | |
333 | */ | |
334 | if (length <= 0 && !whole_file) { | |
335 | ret = fiemap_fill_next_extent(fieinfo, logical, | |
336 | phys, size, | |
337 | flags); | |
338 | break; | |
339 | } | |
340 | ||
341 | /* | |
342 | * if size != 0 then we know we already have an extent | |
343 | * to add, so add it. | |
344 | */ | |
345 | if (size) { | |
68c9d702 JB |
346 | ret = fiemap_fill_next_extent(fieinfo, logical, |
347 | phys, size, | |
348 | flags); | |
349 | if (ret) | |
350 | break; | |
351 | } | |
352 | ||
353 | logical = blk_to_logical(inode, start_blk); | |
354 | phys = blk_to_logical(inode, tmp.b_blocknr); | |
355 | size = tmp.b_size; | |
356 | flags = FIEMAP_EXTENT_MERGED; | |
357 | ||
358 | length -= tmp.b_size; | |
359 | start_blk += logical_to_blk(inode, size); | |
360 | ||
361 | /* | |
df3935ff JB |
362 | * If we are past the EOF, then we need to make sure as |
363 | * soon as we find a hole that the last extent we found | |
364 | * is marked with FIEMAP_EXTENT_LAST | |
68c9d702 | 365 | */ |
df3935ff JB |
366 | if (!past_eof && |
367 | logical+size >= | |
368 | blk_to_logical(inode, 0)+i_size_read(inode)) | |
369 | past_eof = 1; | |
68c9d702 JB |
370 | } |
371 | cond_resched(); | |
372 | } while (1); | |
373 | ||
68c9d702 JB |
374 | /* if ret is 1 then we just hit the end of the extent array */ |
375 | if (ret == 1) | |
376 | ret = 0; | |
377 | ||
378 | return ret; | |
379 | } | |
e9079cce SW |
380 | EXPORT_SYMBOL(__generic_block_fiemap); |
381 | ||
382 | /** | |
383 | * generic_block_fiemap - FIEMAP for block based inodes | |
384 | * @inode: The inode to map | |
385 | * @fieinfo: The mapping information | |
386 | * @start: The initial block to map | |
387 | * @len: The length of the extect to attempt to map | |
388 | * @get_block: The block mapping function for the fs | |
389 | * | |
390 | * Calls __generic_block_fiemap to map the inode, after taking | |
391 | * the inode's mutex lock. | |
392 | */ | |
393 | ||
394 | int generic_block_fiemap(struct inode *inode, | |
395 | struct fiemap_extent_info *fieinfo, u64 start, | |
396 | u64 len, get_block_t *get_block) | |
397 | { | |
398 | int ret; | |
399 | mutex_lock(&inode->i_mutex); | |
400 | ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block); | |
401 | mutex_unlock(&inode->i_mutex); | |
402 | return ret; | |
403 | } | |
68c9d702 JB |
404 | EXPORT_SYMBOL(generic_block_fiemap); |
405 | ||
06270d5d AB |
406 | #endif /* CONFIG_BLOCK */ |
407 | ||
3e63cbb1 AJ |
408 | /* |
409 | * This provides compatibility with legacy XFS pre-allocation ioctls | |
410 | * which predate the fallocate syscall. | |
411 | * | |
412 | * Only the l_start, l_len and l_whence fields of the 'struct space_resv' | |
413 | * are used here, rest are ignored. | |
414 | */ | |
415 | int ioctl_preallocate(struct file *filp, void __user *argp) | |
416 | { | |
417 | struct inode *inode = filp->f_path.dentry->d_inode; | |
418 | struct space_resv sr; | |
419 | ||
420 | if (copy_from_user(&sr, argp, sizeof(sr))) | |
421 | return -EFAULT; | |
422 | ||
423 | switch (sr.l_whence) { | |
424 | case SEEK_SET: | |
425 | break; | |
426 | case SEEK_CUR: | |
427 | sr.l_start += filp->f_pos; | |
428 | break; | |
429 | case SEEK_END: | |
430 | sr.l_start += i_size_read(inode); | |
431 | break; | |
432 | default: | |
433 | return -EINVAL; | |
434 | } | |
435 | ||
436 | return do_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len); | |
437 | } | |
438 | ||
1da177e4 LT |
439 | static int file_ioctl(struct file *filp, unsigned int cmd, |
440 | unsigned long arg) | |
441 | { | |
c9845ff1 | 442 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
443 | int __user *p = (int __user *)arg; |
444 | ||
445 | switch (cmd) { | |
c9845ff1 | 446 | case FIBMAP: |
aa81a7c7 | 447 | return ioctl_fibmap(filp, p); |
c9845ff1 EZ |
448 | case FIONREAD: |
449 | return put_user(i_size_read(inode) - filp->f_pos, p); | |
3e63cbb1 AJ |
450 | case FS_IOC_RESVSP: |
451 | case FS_IOC_RESVSP64: | |
452 | return ioctl_preallocate(filp, p); | |
1da177e4 LT |
453 | } |
454 | ||
deb21db7 | 455 | return vfs_ioctl(filp, cmd, arg); |
1da177e4 LT |
456 | } |
457 | ||
aa81a7c7 EZ |
458 | static int ioctl_fionbio(struct file *filp, int __user *argp) |
459 | { | |
460 | unsigned int flag; | |
461 | int on, error; | |
462 | ||
463 | error = get_user(on, argp); | |
464 | if (error) | |
465 | return error; | |
466 | flag = O_NONBLOCK; | |
467 | #ifdef __sparc__ | |
468 | /* SunOS compatibility item. */ | |
469 | if (O_NONBLOCK != O_NDELAY) | |
470 | flag |= O_NDELAY; | |
471 | #endif | |
db1dd4d3 | 472 | spin_lock(&filp->f_lock); |
aa81a7c7 EZ |
473 | if (on) |
474 | filp->f_flags |= flag; | |
475 | else | |
476 | filp->f_flags &= ~flag; | |
db1dd4d3 | 477 | spin_unlock(&filp->f_lock); |
aa81a7c7 EZ |
478 | return error; |
479 | } | |
480 | ||
481 | static int ioctl_fioasync(unsigned int fd, struct file *filp, | |
482 | int __user *argp) | |
483 | { | |
484 | unsigned int flag; | |
485 | int on, error; | |
486 | ||
487 | error = get_user(on, argp); | |
488 | if (error) | |
489 | return error; | |
490 | flag = on ? FASYNC : 0; | |
491 | ||
492 | /* Did FASYNC state change ? */ | |
493 | if ((flag ^ filp->f_flags) & FASYNC) { | |
218d11a8 | 494 | if (filp->f_op && filp->f_op->fasync) |
76398425 | 495 | /* fasync() adjusts filp->f_flags */ |
aa81a7c7 | 496 | error = filp->f_op->fasync(fd, filp, on); |
218d11a8 | 497 | else |
aa81a7c7 EZ |
498 | error = -ENOTTY; |
499 | } | |
60aa4924 | 500 | return error < 0 ? error : 0; |
aa81a7c7 EZ |
501 | } |
502 | ||
fcccf502 TS |
503 | static int ioctl_fsfreeze(struct file *filp) |
504 | { | |
505 | struct super_block *sb = filp->f_path.dentry->d_inode->i_sb; | |
506 | ||
507 | if (!capable(CAP_SYS_ADMIN)) | |
508 | return -EPERM; | |
509 | ||
510 | /* If filesystem doesn't support freeze feature, return. */ | |
511 | if (sb->s_op->freeze_fs == NULL) | |
512 | return -EOPNOTSUPP; | |
513 | ||
514 | /* If a blockdevice-backed filesystem isn't specified, return. */ | |
515 | if (sb->s_bdev == NULL) | |
516 | return -EINVAL; | |
517 | ||
518 | /* Freeze */ | |
519 | sb = freeze_bdev(sb->s_bdev); | |
520 | if (IS_ERR(sb)) | |
521 | return PTR_ERR(sb); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | static int ioctl_fsthaw(struct file *filp) | |
526 | { | |
527 | struct super_block *sb = filp->f_path.dentry->d_inode->i_sb; | |
528 | ||
529 | if (!capable(CAP_SYS_ADMIN)) | |
530 | return -EPERM; | |
531 | ||
532 | /* If a blockdevice-backed filesystem isn't specified, return EINVAL. */ | |
533 | if (sb->s_bdev == NULL) | |
534 | return -EINVAL; | |
535 | ||
536 | /* Thaw */ | |
537 | return thaw_bdev(sb->s_bdev, sb); | |
538 | } | |
539 | ||
1da177e4 LT |
540 | /* |
541 | * When you add any new common ioctls to the switches above and below | |
542 | * please update compat_sys_ioctl() too. | |
543 | * | |
deb21db7 | 544 | * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. |
1da177e4 LT |
545 | * It's just a simple helper for sys_ioctl and compat_sys_ioctl. |
546 | */ | |
deb21db7 EZ |
547 | int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
548 | unsigned long arg) | |
1da177e4 | 549 | { |
aa81a7c7 EZ |
550 | int error = 0; |
551 | int __user *argp = (int __user *)arg; | |
1da177e4 LT |
552 | |
553 | switch (cmd) { | |
c9845ff1 EZ |
554 | case FIOCLEX: |
555 | set_close_on_exec(fd, 1); | |
556 | break; | |
1da177e4 | 557 | |
c9845ff1 EZ |
558 | case FIONCLEX: |
559 | set_close_on_exec(fd, 0); | |
560 | break; | |
1da177e4 | 561 | |
c9845ff1 | 562 | case FIONBIO: |
aa81a7c7 | 563 | error = ioctl_fionbio(filp, argp); |
c9845ff1 EZ |
564 | break; |
565 | ||
566 | case FIOASYNC: | |
aa81a7c7 | 567 | error = ioctl_fioasync(fd, filp, argp); |
c9845ff1 EZ |
568 | break; |
569 | ||
570 | case FIOQSIZE: | |
571 | if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) || | |
572 | S_ISREG(filp->f_path.dentry->d_inode->i_mode) || | |
573 | S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) { | |
574 | loff_t res = | |
575 | inode_get_bytes(filp->f_path.dentry->d_inode); | |
576 | error = copy_to_user((loff_t __user *)arg, &res, | |
577 | sizeof(res)) ? -EFAULT : 0; | |
578 | } else | |
579 | error = -ENOTTY; | |
580 | break; | |
fcccf502 TS |
581 | |
582 | case FIFREEZE: | |
583 | error = ioctl_fsfreeze(filp); | |
584 | break; | |
585 | ||
586 | case FITHAW: | |
587 | error = ioctl_fsthaw(filp); | |
588 | break; | |
589 | ||
19ba0559 AK |
590 | case FS_IOC_FIEMAP: |
591 | return ioctl_fiemap(filp, arg); | |
592 | ||
593 | case FIGETBSZ: | |
594 | { | |
595 | struct inode *inode = filp->f_path.dentry->d_inode; | |
596 | int __user *p = (int __user *)arg; | |
597 | return put_user(inode->i_sb->s_blocksize, p); | |
598 | } | |
599 | ||
c9845ff1 EZ |
600 | default: |
601 | if (S_ISREG(filp->f_path.dentry->d_inode->i_mode)) | |
602 | error = file_ioctl(filp, cmd, arg); | |
603 | else | |
deb21db7 | 604 | error = vfs_ioctl(filp, cmd, arg); |
c9845ff1 | 605 | break; |
1da177e4 LT |
606 | } |
607 | return error; | |
608 | } | |
609 | ||
a26eab24 | 610 | SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
1da177e4 | 611 | { |
c9845ff1 | 612 | struct file *filp; |
1da177e4 LT |
613 | int error = -EBADF; |
614 | int fput_needed; | |
615 | ||
616 | filp = fget_light(fd, &fput_needed); | |
617 | if (!filp) | |
618 | goto out; | |
619 | ||
620 | error = security_file_ioctl(filp, cmd, arg); | |
621 | if (error) | |
622 | goto out_fput; | |
623 | ||
deb21db7 | 624 | error = do_vfs_ioctl(filp, fd, cmd, arg); |
1da177e4 LT |
625 | out_fput: |
626 | fput_light(filp, fput_needed); | |
627 | out: | |
628 | return error; | |
629 | } |