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CommitLineData
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>
16f7e0fe 9#include <linux/capability.h>
1da177e4
LT
10#include <linux/file.h>
11#include <linux/fs.h>
12#include <linux/security.h>
630d9c47 13#include <linux/export.h>
c9845ff1 14#include <linux/uaccess.h>
68c9d702
JB
15#include <linux/writeback.h>
16#include <linux/buffer_head.h>
3e63cbb1 17#include <linux/falloc.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
deb21db7
EZ
31 * returns -ENOTTY.
32 *
33 * Returns 0 on success, -errno on error.
34 */
67cde595
AB
35static long vfs_ioctl(struct file *filp, unsigned int cmd,
36 unsigned long arg)
1da177e4
LT
37{
38 int error = -ENOTTY;
39
72c2d531 40 if (!filp->f_op->unlocked_ioctl)
1da177e4
LT
41 goto out;
42
b19dd42f
AB
43 error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
44 if (error == -ENOIOCTLCMD)
07d106d0 45 error = -ENOTTY;
1da177e4
LT
46 out:
47 return error;
48}
49
aa81a7c7
EZ
50static int ioctl_fibmap(struct file *filp, int __user *p)
51{
52 struct address_space *mapping = filp->f_mapping;
53 int res, block;
54
55 /* do we support this mess? */
56 if (!mapping->a_ops->bmap)
57 return -EINVAL;
58 if (!capable(CAP_SYS_RAWIO))
59 return -EPERM;
60 res = get_user(block, p);
61 if (res)
62 return res;
aa81a7c7 63 res = mapping->a_ops->bmap(mapping, block);
aa81a7c7
EZ
64 return put_user(res, p);
65}
66
c4b929b8
MF
67/**
68 * fiemap_fill_next_extent - Fiemap helper function
69 * @fieinfo: Fiemap context passed into ->fiemap
70 * @logical: Extent logical start offset, in bytes
71 * @phys: Extent physical start offset, in bytes
72 * @len: Extent length, in bytes
73 * @flags: FIEMAP_EXTENT flags that describe this extent
74 *
75 * Called from file system ->fiemap callback. Will populate extent
76 * info as passed in via arguments and copy to user memory. On
77 * success, extent count on fieinfo is incremented.
78 *
79 * Returns 0 on success, -errno on error, 1 if this was the last
80 * extent that will fit in user array.
81 */
82#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
83#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
84#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
85int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
86 u64 phys, u64 len, u32 flags)
87{
88 struct fiemap_extent extent;
ecf5632d 89 struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
c4b929b8
MF
90
91 /* only count the extents */
92 if (fieinfo->fi_extents_max == 0) {
93 fieinfo->fi_extents_mapped++;
94 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
95 }
96
97 if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
98 return 1;
99
100 if (flags & SET_UNKNOWN_FLAGS)
101 flags |= FIEMAP_EXTENT_UNKNOWN;
102 if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
103 flags |= FIEMAP_EXTENT_ENCODED;
104 if (flags & SET_NOT_ALIGNED_FLAGS)
105 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
106
107 memset(&extent, 0, sizeof(extent));
108 extent.fe_logical = logical;
109 extent.fe_physical = phys;
110 extent.fe_length = len;
111 extent.fe_flags = flags;
112
113 dest += fieinfo->fi_extents_mapped;
114 if (copy_to_user(dest, &extent, sizeof(extent)))
115 return -EFAULT;
116
117 fieinfo->fi_extents_mapped++;
118 if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
119 return 1;
120 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
121}
122EXPORT_SYMBOL(fiemap_fill_next_extent);
123
124/**
125 * fiemap_check_flags - check validity of requested flags for fiemap
126 * @fieinfo: Fiemap context passed into ->fiemap
127 * @fs_flags: Set of fiemap flags that the file system understands
128 *
129 * Called from file system ->fiemap callback. This will compute the
130 * intersection of valid fiemap flags and those that the fs supports. That
131 * value is then compared against the user supplied flags. In case of bad user
132 * flags, the invalid values will be written into the fieinfo structure, and
133 * -EBADR is returned, which tells ioctl_fiemap() to return those values to
134 * userspace. For this reason, a return code of -EBADR should be preserved.
135 *
136 * Returns 0 on success, -EBADR on bad flags.
137 */
138int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
139{
140 u32 incompat_flags;
141
142 incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
143 if (incompat_flags) {
144 fieinfo->fi_flags = incompat_flags;
145 return -EBADR;
146 }
147 return 0;
148}
149EXPORT_SYMBOL(fiemap_check_flags);
150
151static int fiemap_check_ranges(struct super_block *sb,
152 u64 start, u64 len, u64 *new_len)
153{
5aa98b70
JL
154 u64 maxbytes = (u64) sb->s_maxbytes;
155
c4b929b8
MF
156 *new_len = len;
157
158 if (len == 0)
159 return -EINVAL;
160
5aa98b70 161 if (start > maxbytes)
c4b929b8
MF
162 return -EFBIG;
163
164 /*
165 * Shrink request scope to what the fs can actually handle.
166 */
5aa98b70
JL
167 if (len > maxbytes || (maxbytes - len) < start)
168 *new_len = maxbytes - start;
c4b929b8
MF
169
170 return 0;
171}
172
173static int ioctl_fiemap(struct file *filp, unsigned long arg)
174{
175 struct fiemap fiemap;
ecf5632d 176 struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
c4b929b8 177 struct fiemap_extent_info fieinfo = { 0, };
496ad9aa 178 struct inode *inode = file_inode(filp);
c4b929b8
MF
179 struct super_block *sb = inode->i_sb;
180 u64 len;
181 int error;
182
183 if (!inode->i_op->fiemap)
184 return -EOPNOTSUPP;
185
ecf5632d 186 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
c4b929b8
MF
187 return -EFAULT;
188
189 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
190 return -EINVAL;
191
192 error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
193 &len);
194 if (error)
195 return error;
196
197 fieinfo.fi_flags = fiemap.fm_flags;
198 fieinfo.fi_extents_max = fiemap.fm_extent_count;
ecf5632d 199 fieinfo.fi_extents_start = ufiemap->fm_extents;
c4b929b8
MF
200
201 if (fiemap.fm_extent_count != 0 &&
202 !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
203 fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
204 return -EFAULT;
205
206 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
207 filemap_write_and_wait(inode->i_mapping);
208
209 error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
210 fiemap.fm_flags = fieinfo.fi_flags;
211 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
ecf5632d 212 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
c4b929b8
MF
213 error = -EFAULT;
214
215 return error;
216}
217
06270d5d
AB
218#ifdef CONFIG_BLOCK
219
3a3076f4
JB
220static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
221{
222 return (offset >> inode->i_blkbits);
223}
224
225static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
226{
227 return (blk << inode->i_blkbits);
228}
68c9d702 229
e9079cce
SW
230/**
231 * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
3a3076f4
JB
232 * @inode: the inode to map
233 * @fieinfo: the fiemap info struct that will be passed back to userspace
234 * @start: where to start mapping in the inode
235 * @len: how much space to map
236 * @get_block: the fs's get_block function
68c9d702
JB
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
250int __generic_block_fiemap(struct inode *inode,
3a3076f4
JB
251 struct fiemap_extent_info *fieinfo, loff_t start,
252 loff_t len, get_block_t *get_block)
68c9d702 253{
3a3076f4
JB
254 struct buffer_head map_bh;
255 sector_t start_blk, last_blk;
256 loff_t isize = i_size_read(inode);
68c9d702
JB
257 u64 logical = 0, phys = 0, size = 0;
258 u32 flags = FIEMAP_EXTENT_MERGED;
3a3076f4
JB
259 bool past_eof = false, whole_file = false;
260 int ret = 0;
68c9d702 261
3a3076f4
JB
262 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
263 if (ret)
68c9d702
JB
264 return ret;
265
3a3076f4
JB
266 /*
267 * Either the i_mutex or other appropriate locking needs to be held
268 * since we expect isize to not change at all through the duration of
269 * this call.
270 */
271 if (len >= isize) {
272 whole_file = true;
273 len = isize;
274 }
df3935ff 275
d54cdc8c
JB
276 /*
277 * Some filesystems can't deal with being asked to map less than
278 * blocksize, so make sure our len is at least block length.
279 */
280 if (logical_to_blk(inode, len) == 0)
281 len = blk_to_logical(inode, 1);
282
3a3076f4
JB
283 start_blk = logical_to_blk(inode, start);
284 last_blk = logical_to_blk(inode, start + len - 1);
68c9d702
JB
285
286 do {
287 /*
288 * we set b_size to the total size we want so it will map as
289 * many contiguous blocks as possible at once
290 */
3a3076f4
JB
291 memset(&map_bh, 0, sizeof(struct buffer_head));
292 map_bh.b_size = len;
68c9d702 293
3a3076f4 294 ret = get_block(inode, start_blk, &map_bh, 0);
68c9d702
JB
295 if (ret)
296 break;
297
298 /* HOLE */
3a3076f4 299 if (!buffer_mapped(&map_bh)) {
df3935ff
JB
300 start_blk++;
301
302 /*
3a3076f4 303 * We want to handle the case where there is an
df3935ff
JB
304 * allocated block at the front of the file, and then
305 * nothing but holes up to the end of the file properly,
306 * to make sure that extent at the front gets properly
307 * marked with FIEMAP_EXTENT_LAST
308 */
309 if (!past_eof &&
3a3076f4 310 blk_to_logical(inode, start_blk) >= isize)
df3935ff
JB
311 past_eof = 1;
312
68c9d702 313 /*
3a3076f4 314 * First hole after going past the EOF, this is our
68c9d702
JB
315 * last extent
316 */
df3935ff 317 if (past_eof && size) {
68c9d702
JB
318 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
319 ret = fiemap_fill_next_extent(fieinfo, logical,
320 phys, size,
321 flags);
3a3076f4
JB
322 } else if (size) {
323 ret = fiemap_fill_next_extent(fieinfo, logical,
324 phys, size, flags);
325 size = 0;
68c9d702
JB
326 }
327
68c9d702 328 /* if we have holes up to/past EOF then we're done */
3a3076f4 329 if (start_blk > last_blk || past_eof || ret)
68c9d702 330 break;
68c9d702 331 } else {
df3935ff 332 /*
3a3076f4 333 * We have gone over the length of what we wanted to
df3935ff
JB
334 * map, and it wasn't the entire file, so add the extent
335 * we got last time and exit.
336 *
337 * This is for the case where say we want to map all the
338 * way up to the second to the last block in a file, but
339 * the last block is a hole, making the second to last
340 * block FIEMAP_EXTENT_LAST. In this case we want to
341 * see if there is a hole after the second to last block
342 * so we can mark it properly. If we found data after
343 * we exceeded the length we were requesting, then we
344 * are good to go, just add the extent to the fieinfo
345 * and break
346 */
3a3076f4 347 if (start_blk > last_blk && !whole_file) {
df3935ff
JB
348 ret = fiemap_fill_next_extent(fieinfo, logical,
349 phys, size,
350 flags);
351 break;
352 }
353
354 /*
355 * if size != 0 then we know we already have an extent
356 * to add, so add it.
357 */
358 if (size) {
68c9d702
JB
359 ret = fiemap_fill_next_extent(fieinfo, logical,
360 phys, size,
361 flags);
362 if (ret)
363 break;
364 }
365
366 logical = blk_to_logical(inode, start_blk);
3a3076f4
JB
367 phys = blk_to_logical(inode, map_bh.b_blocknr);
368 size = map_bh.b_size;
68c9d702
JB
369 flags = FIEMAP_EXTENT_MERGED;
370
68c9d702
JB
371 start_blk += logical_to_blk(inode, size);
372
373 /*
df3935ff
JB
374 * If we are past the EOF, then we need to make sure as
375 * soon as we find a hole that the last extent we found
376 * is marked with FIEMAP_EXTENT_LAST
68c9d702 377 */
3a3076f4
JB
378 if (!past_eof && logical + size >= isize)
379 past_eof = true;
68c9d702
JB
380 }
381 cond_resched();
913e027c
DM
382 if (fatal_signal_pending(current)) {
383 ret = -EINTR;
384 break;
385 }
386
68c9d702
JB
387 } while (1);
388
3a3076f4 389 /* If ret is 1 then we just hit the end of the extent array */
68c9d702
JB
390 if (ret == 1)
391 ret = 0;
392
393 return ret;
394}
e9079cce
SW
395EXPORT_SYMBOL(__generic_block_fiemap);
396
397/**
398 * generic_block_fiemap - FIEMAP for block based inodes
399 * @inode: The inode to map
400 * @fieinfo: The mapping information
401 * @start: The initial block to map
402 * @len: The length of the extect to attempt to map
403 * @get_block: The block mapping function for the fs
404 *
405 * Calls __generic_block_fiemap to map the inode, after taking
406 * the inode's mutex lock.
407 */
408
409int generic_block_fiemap(struct inode *inode,
410 struct fiemap_extent_info *fieinfo, u64 start,
411 u64 len, get_block_t *get_block)
412{
413 int ret;
414 mutex_lock(&inode->i_mutex);
415 ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
416 mutex_unlock(&inode->i_mutex);
417 return ret;
418}
68c9d702
JB
419EXPORT_SYMBOL(generic_block_fiemap);
420
06270d5d
AB
421#endif /* CONFIG_BLOCK */
422
3e63cbb1
AJ
423/*
424 * This provides compatibility with legacy XFS pre-allocation ioctls
425 * which predate the fallocate syscall.
426 *
427 * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
428 * are used here, rest are ignored.
429 */
430int ioctl_preallocate(struct file *filp, void __user *argp)
431{
496ad9aa 432 struct inode *inode = file_inode(filp);
3e63cbb1
AJ
433 struct space_resv sr;
434
435 if (copy_from_user(&sr, argp, sizeof(sr)))
436 return -EFAULT;
437
438 switch (sr.l_whence) {
439 case SEEK_SET:
440 break;
441 case SEEK_CUR:
442 sr.l_start += filp->f_pos;
443 break;
444 case SEEK_END:
445 sr.l_start += i_size_read(inode);
446 break;
447 default:
448 return -EINVAL;
449 }
450
72c72bdf 451 return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
3e63cbb1
AJ
452}
453
1da177e4
LT
454static int file_ioctl(struct file *filp, unsigned int cmd,
455 unsigned long arg)
456{
496ad9aa 457 struct inode *inode = file_inode(filp);
1da177e4
LT
458 int __user *p = (int __user *)arg;
459
460 switch (cmd) {
c9845ff1 461 case FIBMAP:
aa81a7c7 462 return ioctl_fibmap(filp, p);
c9845ff1
EZ
463 case FIONREAD:
464 return put_user(i_size_read(inode) - filp->f_pos, p);
3e63cbb1
AJ
465 case FS_IOC_RESVSP:
466 case FS_IOC_RESVSP64:
467 return ioctl_preallocate(filp, p);
1da177e4
LT
468 }
469
deb21db7 470 return vfs_ioctl(filp, cmd, arg);
1da177e4
LT
471}
472
aa81a7c7
EZ
473static int ioctl_fionbio(struct file *filp, int __user *argp)
474{
475 unsigned int flag;
476 int on, error;
477
478 error = get_user(on, argp);
479 if (error)
480 return error;
481 flag = O_NONBLOCK;
482#ifdef __sparc__
483 /* SunOS compatibility item. */
484 if (O_NONBLOCK != O_NDELAY)
485 flag |= O_NDELAY;
486#endif
db1dd4d3 487 spin_lock(&filp->f_lock);
aa81a7c7
EZ
488 if (on)
489 filp->f_flags |= flag;
490 else
491 filp->f_flags &= ~flag;
db1dd4d3 492 spin_unlock(&filp->f_lock);
aa81a7c7
EZ
493 return error;
494}
495
496static int ioctl_fioasync(unsigned int fd, struct file *filp,
497 int __user *argp)
498{
499 unsigned int flag;
500 int on, error;
501
502 error = get_user(on, argp);
503 if (error)
504 return error;
505 flag = on ? FASYNC : 0;
506
507 /* Did FASYNC state change ? */
508 if ((flag ^ filp->f_flags) & FASYNC) {
72c2d531 509 if (filp->f_op->fasync)
76398425 510 /* fasync() adjusts filp->f_flags */
aa81a7c7 511 error = filp->f_op->fasync(fd, filp, on);
218d11a8 512 else
aa81a7c7
EZ
513 error = -ENOTTY;
514 }
60aa4924 515 return error < 0 ? error : 0;
aa81a7c7
EZ
516}
517
fcccf502
TS
518static int ioctl_fsfreeze(struct file *filp)
519{
496ad9aa 520 struct super_block *sb = file_inode(filp)->i_sb;
fcccf502
TS
521
522 if (!capable(CAP_SYS_ADMIN))
523 return -EPERM;
524
525 /* If filesystem doesn't support freeze feature, return. */
48b6bca6 526 if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
fcccf502
TS
527 return -EOPNOTSUPP;
528
fcccf502 529 /* Freeze */
48b6bca6
BM
530 if (sb->s_op->freeze_super)
531 return sb->s_op->freeze_super(sb);
18e9e510 532 return freeze_super(sb);
fcccf502
TS
533}
534
535static int ioctl_fsthaw(struct file *filp)
536{
496ad9aa 537 struct super_block *sb = file_inode(filp)->i_sb;
fcccf502
TS
538
539 if (!capable(CAP_SYS_ADMIN))
540 return -EPERM;
541
fcccf502 542 /* Thaw */
48b6bca6
BM
543 if (sb->s_op->thaw_super)
544 return sb->s_op->thaw_super(sb);
18e9e510 545 return thaw_super(sb);
fcccf502
TS
546}
547
1da177e4
LT
548/*
549 * When you add any new common ioctls to the switches above and below
550 * please update compat_sys_ioctl() too.
551 *
deb21db7 552 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
1da177e4
LT
553 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
554 */
deb21db7
EZ
555int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
556 unsigned long arg)
1da177e4 557{
aa81a7c7
EZ
558 int error = 0;
559 int __user *argp = (int __user *)arg;
496ad9aa 560 struct inode *inode = file_inode(filp);
1da177e4
LT
561
562 switch (cmd) {
c9845ff1
EZ
563 case FIOCLEX:
564 set_close_on_exec(fd, 1);
565 break;
1da177e4 566
c9845ff1
EZ
567 case FIONCLEX:
568 set_close_on_exec(fd, 0);
569 break;
1da177e4 570
c9845ff1 571 case FIONBIO:
aa81a7c7 572 error = ioctl_fionbio(filp, argp);
c9845ff1
EZ
573 break;
574
575 case FIOASYNC:
aa81a7c7 576 error = ioctl_fioasync(fd, filp, argp);
c9845ff1
EZ
577 break;
578
579 case FIOQSIZE:
27a4f7e6
NK
580 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
581 S_ISLNK(inode->i_mode)) {
582 loff_t res = inode_get_bytes(inode);
583 error = copy_to_user(argp, &res, sizeof(res)) ?
584 -EFAULT : 0;
c9845ff1
EZ
585 } else
586 error = -ENOTTY;
587 break;
fcccf502
TS
588
589 case FIFREEZE:
590 error = ioctl_fsfreeze(filp);
591 break;
592
593 case FITHAW:
594 error = ioctl_fsthaw(filp);
595 break;
596
19ba0559
AK
597 case FS_IOC_FIEMAP:
598 return ioctl_fiemap(filp, arg);
599
600 case FIGETBSZ:
27a4f7e6 601 return put_user(inode->i_sb->s_blocksize, argp);
19ba0559 602
c9845ff1 603 default:
27a4f7e6 604 if (S_ISREG(inode->i_mode))
c9845ff1
EZ
605 error = file_ioctl(filp, cmd, arg);
606 else
deb21db7 607 error = vfs_ioctl(filp, cmd, arg);
c9845ff1 608 break;
1da177e4
LT
609 }
610 return error;
611}
612
a26eab24 613SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
1da177e4 614{
2903ff01
AV
615 int error;
616 struct fd f = fdget(fd);
617
618 if (!f.file)
619 return -EBADF;
620 error = security_file_ioctl(f.file, cmd, arg);
621 if (!error)
622 error = do_vfs_ioctl(f.file, fd, cmd, arg);
623 fdput(f);
1da177e4
LT
624 return error;
625}