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