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 | { | |
165 | *new_len = len; | |
166 | ||
167 | if (len == 0) | |
168 | return -EINVAL; | |
169 | ||
170 | if (start > sb->s_maxbytes) | |
171 | return -EFBIG; | |
172 | ||
173 | /* | |
174 | * Shrink request scope to what the fs can actually handle. | |
175 | */ | |
176 | if ((len > sb->s_maxbytes) || | |
177 | (sb->s_maxbytes - len) < start) | |
178 | *new_len = sb->s_maxbytes - start; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int ioctl_fiemap(struct file *filp, unsigned long arg) | |
184 | { | |
185 | struct fiemap fiemap; | |
186 | struct fiemap_extent_info fieinfo = { 0, }; | |
187 | struct inode *inode = filp->f_path.dentry->d_inode; | |
188 | struct super_block *sb = inode->i_sb; | |
189 | u64 len; | |
190 | int error; | |
191 | ||
192 | if (!inode->i_op->fiemap) | |
193 | return -EOPNOTSUPP; | |
194 | ||
195 | if (copy_from_user(&fiemap, (struct fiemap __user *)arg, | |
196 | sizeof(struct fiemap))) | |
197 | return -EFAULT; | |
198 | ||
199 | if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) | |
200 | return -EINVAL; | |
201 | ||
202 | error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length, | |
203 | &len); | |
204 | if (error) | |
205 | return error; | |
206 | ||
207 | fieinfo.fi_flags = fiemap.fm_flags; | |
208 | fieinfo.fi_extents_max = fiemap.fm_extent_count; | |
209 | fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap)); | |
210 | ||
211 | if (fiemap.fm_extent_count != 0 && | |
212 | !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start, | |
213 | fieinfo.fi_extents_max * sizeof(struct fiemap_extent))) | |
214 | return -EFAULT; | |
215 | ||
216 | if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC) | |
217 | filemap_write_and_wait(inode->i_mapping); | |
218 | ||
219 | error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len); | |
220 | fiemap.fm_flags = fieinfo.fi_flags; | |
221 | fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; | |
222 | if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap))) | |
223 | error = -EFAULT; | |
224 | ||
225 | return error; | |
226 | } | |
227 | ||
06270d5d AB |
228 | #ifdef CONFIG_BLOCK |
229 | ||
68c9d702 JB |
230 | #define blk_to_logical(inode, blk) (blk << (inode)->i_blkbits) |
231 | #define logical_to_blk(inode, offset) (offset >> (inode)->i_blkbits); | |
232 | ||
e9079cce SW |
233 | /** |
234 | * __generic_block_fiemap - FIEMAP for block based inodes (no locking) | |
68c9d702 JB |
235 | * @inode - the inode to map |
236 | * @arg - the pointer to userspace where we copy everything to | |
237 | * @get_block - the fs's get_block function | |
238 | * | |
239 | * This does FIEMAP for block based inodes. Basically it will just loop | |
240 | * through get_block until we hit the number of extents we want to map, or we | |
241 | * go past the end of the file and hit a hole. | |
242 | * | |
243 | * If it is possible to have data blocks beyond a hole past @inode->i_size, then | |
244 | * please do not use this function, it will stop at the first unmapped block | |
e9079cce SW |
245 | * beyond i_size. |
246 | * | |
247 | * If you use this function directly, you need to do your own locking. Use | |
248 | * generic_block_fiemap if you want the locking done for you. | |
68c9d702 | 249 | */ |
e9079cce SW |
250 | |
251 | int __generic_block_fiemap(struct inode *inode, | |
252 | struct fiemap_extent_info *fieinfo, u64 start, | |
253 | u64 len, get_block_t *get_block) | |
68c9d702 JB |
254 | { |
255 | struct buffer_head tmp; | |
256 | unsigned int start_blk; | |
257 | long long length = 0, map_len = 0; | |
258 | u64 logical = 0, phys = 0, size = 0; | |
259 | u32 flags = FIEMAP_EXTENT_MERGED; | |
df3935ff | 260 | int ret = 0, past_eof = 0, whole_file = 0; |
68c9d702 JB |
261 | |
262 | if ((ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC))) | |
263 | return ret; | |
264 | ||
265 | start_blk = logical_to_blk(inode, start); | |
266 | ||
68c9d702 | 267 | length = (long long)min_t(u64, len, i_size_read(inode)); |
df3935ff JB |
268 | if (length < len) |
269 | whole_file = 1; | |
270 | ||
68c9d702 JB |
271 | map_len = length; |
272 | ||
273 | do { | |
274 | /* | |
275 | * we set b_size to the total size we want so it will map as | |
276 | * many contiguous blocks as possible at once | |
277 | */ | |
278 | memset(&tmp, 0, sizeof(struct buffer_head)); | |
279 | tmp.b_size = map_len; | |
280 | ||
281 | ret = get_block(inode, start_blk, &tmp, 0); | |
282 | if (ret) | |
283 | break; | |
284 | ||
285 | /* HOLE */ | |
286 | if (!buffer_mapped(&tmp)) { | |
df3935ff JB |
287 | length -= blk_to_logical(inode, 1); |
288 | start_blk++; | |
289 | ||
290 | /* | |
291 | * we want to handle the case where there is an | |
292 | * allocated block at the front of the file, and then | |
293 | * nothing but holes up to the end of the file properly, | |
294 | * to make sure that extent at the front gets properly | |
295 | * marked with FIEMAP_EXTENT_LAST | |
296 | */ | |
297 | if (!past_eof && | |
298 | blk_to_logical(inode, start_blk) >= | |
299 | blk_to_logical(inode, 0)+i_size_read(inode)) | |
300 | past_eof = 1; | |
301 | ||
68c9d702 JB |
302 | /* |
303 | * first hole after going past the EOF, this is our | |
304 | * last extent | |
305 | */ | |
df3935ff | 306 | if (past_eof && size) { |
68c9d702 JB |
307 | flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST; |
308 | ret = fiemap_fill_next_extent(fieinfo, logical, | |
309 | phys, size, | |
310 | flags); | |
311 | break; | |
312 | } | |
313 | ||
68c9d702 | 314 | /* if we have holes up to/past EOF then we're done */ |
df3935ff | 315 | if (length <= 0 || past_eof) |
68c9d702 | 316 | break; |
68c9d702 | 317 | } else { |
df3935ff JB |
318 | /* |
319 | * we have gone over the length of what we wanted to | |
320 | * map, and it wasn't the entire file, so add the extent | |
321 | * we got last time and exit. | |
322 | * | |
323 | * This is for the case where say we want to map all the | |
324 | * way up to the second to the last block in a file, but | |
325 | * the last block is a hole, making the second to last | |
326 | * block FIEMAP_EXTENT_LAST. In this case we want to | |
327 | * see if there is a hole after the second to last block | |
328 | * so we can mark it properly. If we found data after | |
329 | * we exceeded the length we were requesting, then we | |
330 | * are good to go, just add the extent to the fieinfo | |
331 | * and break | |
332 | */ | |
333 | if (length <= 0 && !whole_file) { | |
334 | ret = fiemap_fill_next_extent(fieinfo, logical, | |
335 | phys, size, | |
336 | flags); | |
337 | break; | |
338 | } | |
339 | ||
340 | /* | |
341 | * if size != 0 then we know we already have an extent | |
342 | * to add, so add it. | |
343 | */ | |
344 | if (size) { | |
68c9d702 JB |
345 | ret = fiemap_fill_next_extent(fieinfo, logical, |
346 | phys, size, | |
347 | flags); | |
348 | if (ret) | |
349 | break; | |
350 | } | |
351 | ||
352 | logical = blk_to_logical(inode, start_blk); | |
353 | phys = blk_to_logical(inode, tmp.b_blocknr); | |
354 | size = tmp.b_size; | |
355 | flags = FIEMAP_EXTENT_MERGED; | |
356 | ||
357 | length -= tmp.b_size; | |
358 | start_blk += logical_to_blk(inode, size); | |
359 | ||
360 | /* | |
df3935ff JB |
361 | * If we are past the EOF, then we need to make sure as |
362 | * soon as we find a hole that the last extent we found | |
363 | * is marked with FIEMAP_EXTENT_LAST | |
68c9d702 | 364 | */ |
df3935ff JB |
365 | if (!past_eof && |
366 | logical+size >= | |
367 | blk_to_logical(inode, 0)+i_size_read(inode)) | |
368 | past_eof = 1; | |
68c9d702 JB |
369 | } |
370 | cond_resched(); | |
371 | } while (1); | |
372 | ||
68c9d702 JB |
373 | /* if ret is 1 then we just hit the end of the extent array */ |
374 | if (ret == 1) | |
375 | ret = 0; | |
376 | ||
377 | return ret; | |
378 | } | |
e9079cce SW |
379 | EXPORT_SYMBOL(__generic_block_fiemap); |
380 | ||
381 | /** | |
382 | * generic_block_fiemap - FIEMAP for block based inodes | |
383 | * @inode: The inode to map | |
384 | * @fieinfo: The mapping information | |
385 | * @start: The initial block to map | |
386 | * @len: The length of the extect to attempt to map | |
387 | * @get_block: The block mapping function for the fs | |
388 | * | |
389 | * Calls __generic_block_fiemap to map the inode, after taking | |
390 | * the inode's mutex lock. | |
391 | */ | |
392 | ||
393 | int generic_block_fiemap(struct inode *inode, | |
394 | struct fiemap_extent_info *fieinfo, u64 start, | |
395 | u64 len, get_block_t *get_block) | |
396 | { | |
397 | int ret; | |
398 | mutex_lock(&inode->i_mutex); | |
399 | ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block); | |
400 | mutex_unlock(&inode->i_mutex); | |
401 | return ret; | |
402 | } | |
68c9d702 JB |
403 | EXPORT_SYMBOL(generic_block_fiemap); |
404 | ||
06270d5d AB |
405 | #endif /* CONFIG_BLOCK */ |
406 | ||
3e63cbb1 AJ |
407 | /* |
408 | * This provides compatibility with legacy XFS pre-allocation ioctls | |
409 | * which predate the fallocate syscall. | |
410 | * | |
411 | * Only the l_start, l_len and l_whence fields of the 'struct space_resv' | |
412 | * are used here, rest are ignored. | |
413 | */ | |
414 | int ioctl_preallocate(struct file *filp, void __user *argp) | |
415 | { | |
416 | struct inode *inode = filp->f_path.dentry->d_inode; | |
417 | struct space_resv sr; | |
418 | ||
419 | if (copy_from_user(&sr, argp, sizeof(sr))) | |
420 | return -EFAULT; | |
421 | ||
422 | switch (sr.l_whence) { | |
423 | case SEEK_SET: | |
424 | break; | |
425 | case SEEK_CUR: | |
426 | sr.l_start += filp->f_pos; | |
427 | break; | |
428 | case SEEK_END: | |
429 | sr.l_start += i_size_read(inode); | |
430 | break; | |
431 | default: | |
432 | return -EINVAL; | |
433 | } | |
434 | ||
435 | return do_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len); | |
436 | } | |
437 | ||
1da177e4 LT |
438 | static int file_ioctl(struct file *filp, unsigned int cmd, |
439 | unsigned long arg) | |
440 | { | |
c9845ff1 | 441 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
442 | int __user *p = (int __user *)arg; |
443 | ||
444 | switch (cmd) { | |
c9845ff1 | 445 | case FIBMAP: |
aa81a7c7 | 446 | return ioctl_fibmap(filp, p); |
c9845ff1 EZ |
447 | case FIONREAD: |
448 | return put_user(i_size_read(inode) - filp->f_pos, p); | |
3e63cbb1 AJ |
449 | case FS_IOC_RESVSP: |
450 | case FS_IOC_RESVSP64: | |
451 | return ioctl_preallocate(filp, p); | |
1da177e4 LT |
452 | } |
453 | ||
deb21db7 | 454 | return vfs_ioctl(filp, cmd, arg); |
1da177e4 LT |
455 | } |
456 | ||
aa81a7c7 EZ |
457 | static int ioctl_fionbio(struct file *filp, int __user *argp) |
458 | { | |
459 | unsigned int flag; | |
460 | int on, error; | |
461 | ||
462 | error = get_user(on, argp); | |
463 | if (error) | |
464 | return error; | |
465 | flag = O_NONBLOCK; | |
466 | #ifdef __sparc__ | |
467 | /* SunOS compatibility item. */ | |
468 | if (O_NONBLOCK != O_NDELAY) | |
469 | flag |= O_NDELAY; | |
470 | #endif | |
db1dd4d3 | 471 | spin_lock(&filp->f_lock); |
aa81a7c7 EZ |
472 | if (on) |
473 | filp->f_flags |= flag; | |
474 | else | |
475 | filp->f_flags &= ~flag; | |
db1dd4d3 | 476 | spin_unlock(&filp->f_lock); |
aa81a7c7 EZ |
477 | return error; |
478 | } | |
479 | ||
480 | static int ioctl_fioasync(unsigned int fd, struct file *filp, | |
481 | int __user *argp) | |
482 | { | |
483 | unsigned int flag; | |
484 | int on, error; | |
485 | ||
486 | error = get_user(on, argp); | |
487 | if (error) | |
488 | return error; | |
489 | flag = on ? FASYNC : 0; | |
490 | ||
491 | /* Did FASYNC state change ? */ | |
492 | if ((flag ^ filp->f_flags) & FASYNC) { | |
218d11a8 | 493 | if (filp->f_op && filp->f_op->fasync) |
76398425 | 494 | /* fasync() adjusts filp->f_flags */ |
aa81a7c7 | 495 | error = filp->f_op->fasync(fd, filp, on); |
218d11a8 | 496 | else |
aa81a7c7 EZ |
497 | error = -ENOTTY; |
498 | } | |
60aa4924 | 499 | return error < 0 ? error : 0; |
aa81a7c7 EZ |
500 | } |
501 | ||
fcccf502 TS |
502 | static int ioctl_fsfreeze(struct file *filp) |
503 | { | |
504 | struct super_block *sb = filp->f_path.dentry->d_inode->i_sb; | |
505 | ||
506 | if (!capable(CAP_SYS_ADMIN)) | |
507 | return -EPERM; | |
508 | ||
509 | /* If filesystem doesn't support freeze feature, return. */ | |
510 | if (sb->s_op->freeze_fs == NULL) | |
511 | return -EOPNOTSUPP; | |
512 | ||
513 | /* If a blockdevice-backed filesystem isn't specified, return. */ | |
514 | if (sb->s_bdev == NULL) | |
515 | return -EINVAL; | |
516 | ||
517 | /* Freeze */ | |
518 | sb = freeze_bdev(sb->s_bdev); | |
519 | if (IS_ERR(sb)) | |
520 | return PTR_ERR(sb); | |
521 | return 0; | |
522 | } | |
523 | ||
524 | static int ioctl_fsthaw(struct file *filp) | |
525 | { | |
526 | struct super_block *sb = filp->f_path.dentry->d_inode->i_sb; | |
527 | ||
528 | if (!capable(CAP_SYS_ADMIN)) | |
529 | return -EPERM; | |
530 | ||
531 | /* If a blockdevice-backed filesystem isn't specified, return EINVAL. */ | |
532 | if (sb->s_bdev == NULL) | |
533 | return -EINVAL; | |
534 | ||
535 | /* Thaw */ | |
536 | return thaw_bdev(sb->s_bdev, sb); | |
537 | } | |
538 | ||
1da177e4 LT |
539 | /* |
540 | * When you add any new common ioctls to the switches above and below | |
541 | * please update compat_sys_ioctl() too. | |
542 | * | |
deb21db7 | 543 | * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. |
1da177e4 LT |
544 | * It's just a simple helper for sys_ioctl and compat_sys_ioctl. |
545 | */ | |
deb21db7 EZ |
546 | int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
547 | unsigned long arg) | |
1da177e4 | 548 | { |
aa81a7c7 EZ |
549 | int error = 0; |
550 | int __user *argp = (int __user *)arg; | |
1da177e4 LT |
551 | |
552 | switch (cmd) { | |
c9845ff1 EZ |
553 | case FIOCLEX: |
554 | set_close_on_exec(fd, 1); | |
555 | break; | |
1da177e4 | 556 | |
c9845ff1 EZ |
557 | case FIONCLEX: |
558 | set_close_on_exec(fd, 0); | |
559 | break; | |
1da177e4 | 560 | |
c9845ff1 | 561 | case FIONBIO: |
aa81a7c7 | 562 | error = ioctl_fionbio(filp, argp); |
c9845ff1 EZ |
563 | break; |
564 | ||
565 | case FIOASYNC: | |
aa81a7c7 | 566 | error = ioctl_fioasync(fd, filp, argp); |
c9845ff1 EZ |
567 | break; |
568 | ||
569 | case FIOQSIZE: | |
570 | if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) || | |
571 | S_ISREG(filp->f_path.dentry->d_inode->i_mode) || | |
572 | S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) { | |
573 | loff_t res = | |
574 | inode_get_bytes(filp->f_path.dentry->d_inode); | |
575 | error = copy_to_user((loff_t __user *)arg, &res, | |
576 | sizeof(res)) ? -EFAULT : 0; | |
577 | } else | |
578 | error = -ENOTTY; | |
579 | break; | |
fcccf502 TS |
580 | |
581 | case FIFREEZE: | |
582 | error = ioctl_fsfreeze(filp); | |
583 | break; | |
584 | ||
585 | case FITHAW: | |
586 | error = ioctl_fsthaw(filp); | |
587 | break; | |
588 | ||
19ba0559 AK |
589 | case FS_IOC_FIEMAP: |
590 | return ioctl_fiemap(filp, arg); | |
591 | ||
592 | case FIGETBSZ: | |
593 | { | |
594 | struct inode *inode = filp->f_path.dentry->d_inode; | |
595 | int __user *p = (int __user *)arg; | |
596 | return put_user(inode->i_sb->s_blocksize, p); | |
597 | } | |
598 | ||
c9845ff1 EZ |
599 | default: |
600 | if (S_ISREG(filp->f_path.dentry->d_inode->i_mode)) | |
601 | error = file_ioctl(filp, cmd, arg); | |
602 | else | |
deb21db7 | 603 | error = vfs_ioctl(filp, cmd, arg); |
c9845ff1 | 604 | break; |
1da177e4 LT |
605 | } |
606 | return error; | |
607 | } | |
608 | ||
a26eab24 | 609 | SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
1da177e4 | 610 | { |
c9845ff1 | 611 | struct file *filp; |
1da177e4 LT |
612 | int error = -EBADF; |
613 | int fput_needed; | |
614 | ||
615 | filp = fget_light(fd, &fput_needed); | |
616 | if (!filp) | |
617 | goto out; | |
618 | ||
619 | error = security_file_ioctl(filp, cmd, arg); | |
620 | if (error) | |
621 | goto out_fput; | |
622 | ||
deb21db7 | 623 | error = do_vfs_ioctl(filp, fd, cmd, arg); |
1da177e4 LT |
624 | out_fput: |
625 | fput_light(filp, fput_needed); | |
626 | out: | |
627 | return error; | |
628 | } |