1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  linux/fs/ioctl.c
4  *
5  *  Copyright (C) 1991, 1992  Linus Torvalds
6  */
7 
8 #include <linux/syscalls.h>
9 #include <linux/mm.h>
10 #include <linux/capability.h>
11 #include <linux/file.h>
12 #include <linux/fs.h>
13 #include <linux/security.h>
14 #include <linux/export.h>
15 #include <linux/uaccess.h>
16 #include <linux/writeback.h>
17 #include <linux/buffer_head.h>
18 #include <linux/falloc.h>
19 #include <linux/sched/signal.h>
20 
21 #include "internal.h"
22 
23 #include <asm/ioctls.h>
24 
25 /* So that the fiemap access checks can't overflow on 32 bit machines. */
26 #define FIEMAP_MAX_EXTENTS	(UINT_MAX / sizeof(struct fiemap_extent))
27 
28 /**
29  * vfs_ioctl - call filesystem specific ioctl methods
30  * @filp:	open file to invoke ioctl method on
31  * @cmd:	ioctl command to execute
32  * @arg:	command-specific argument for ioctl
33  *
34  * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
35  * returns -ENOTTY.
36  *
37  * Returns 0 on success, -errno on error.
38  */
vfs_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)39 long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
40 {
41 	int error = -ENOTTY;
42 
43 	if (!filp->f_op->unlocked_ioctl)
44 		goto out;
45 
46 	error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
47 	if (error == -ENOIOCTLCMD)
48 		error = -ENOTTY;
49  out:
50 	return error;
51 }
52 EXPORT_SYMBOL(vfs_ioctl);
53 
ioctl_fibmap(struct file * filp,int __user * p)54 static int ioctl_fibmap(struct file *filp, int __user *p)
55 {
56 	struct address_space *mapping = filp->f_mapping;
57 	int res, block;
58 
59 	/* do we support this mess? */
60 	if (!mapping->a_ops->bmap)
61 		return -EINVAL;
62 	if (!capable(CAP_SYS_RAWIO))
63 		return -EPERM;
64 	res = get_user(block, p);
65 	if (res)
66 		return res;
67 	res = mapping->a_ops->bmap(mapping, block);
68 	return put_user(res, p);
69 }
70 
71 /**
72  * fiemap_fill_next_extent - Fiemap helper function
73  * @fieinfo:	Fiemap context passed into ->fiemap
74  * @logical:	Extent logical start offset, in bytes
75  * @phys:	Extent physical start offset, in bytes
76  * @len:	Extent length, in bytes
77  * @flags:	FIEMAP_EXTENT flags that describe this extent
78  *
79  * Called from file system ->fiemap callback. Will populate extent
80  * info as passed in via arguments and copy to user memory. On
81  * success, extent count on fieinfo is incremented.
82  *
83  * Returns 0 on success, -errno on error, 1 if this was the last
84  * extent that will fit in user array.
85  */
86 #define SET_UNKNOWN_FLAGS	(FIEMAP_EXTENT_DELALLOC)
87 #define SET_NO_UNMOUNTED_IO_FLAGS	(FIEMAP_EXTENT_DATA_ENCRYPTED)
88 #define SET_NOT_ALIGNED_FLAGS	(FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
fiemap_fill_next_extent(struct fiemap_extent_info * fieinfo,u64 logical,u64 phys,u64 len,u32 flags)89 int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
90 			    u64 phys, u64 len, u32 flags)
91 {
92 	struct fiemap_extent extent;
93 	struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
94 
95 	/* only count the extents */
96 	if (fieinfo->fi_extents_max == 0) {
97 		fieinfo->fi_extents_mapped++;
98 		return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
99 	}
100 
101 	if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
102 		return 1;
103 
104 	if (flags & SET_UNKNOWN_FLAGS)
105 		flags |= FIEMAP_EXTENT_UNKNOWN;
106 	if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
107 		flags |= FIEMAP_EXTENT_ENCODED;
108 	if (flags & SET_NOT_ALIGNED_FLAGS)
109 		flags |= FIEMAP_EXTENT_NOT_ALIGNED;
110 
111 	memset(&extent, 0, sizeof(extent));
112 	extent.fe_logical = logical;
113 	extent.fe_physical = phys;
114 	extent.fe_length = len;
115 	extent.fe_flags = flags;
116 
117 	dest += fieinfo->fi_extents_mapped;
118 	if (copy_to_user(dest, &extent, sizeof(extent)))
119 		return -EFAULT;
120 
121 	fieinfo->fi_extents_mapped++;
122 	if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
123 		return 1;
124 	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
125 }
126 EXPORT_SYMBOL(fiemap_fill_next_extent);
127 
128 /**
129  * fiemap_check_flags - check validity of requested flags for fiemap
130  * @fieinfo:	Fiemap context passed into ->fiemap
131  * @fs_flags:	Set of fiemap flags that the file system understands
132  *
133  * Called from file system ->fiemap callback. This will compute the
134  * intersection of valid fiemap flags and those that the fs supports. That
135  * value is then compared against the user supplied flags. In case of bad user
136  * flags, the invalid values will be written into the fieinfo structure, and
137  * -EBADR is returned, which tells ioctl_fiemap() to return those values to
138  * userspace. For this reason, a return code of -EBADR should be preserved.
139  *
140  * Returns 0 on success, -EBADR on bad flags.
141  */
fiemap_check_flags(struct fiemap_extent_info * fieinfo,u32 fs_flags)142 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
143 {
144 	u32 incompat_flags;
145 
146 	incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
147 	if (incompat_flags) {
148 		fieinfo->fi_flags = incompat_flags;
149 		return -EBADR;
150 	}
151 	return 0;
152 }
153 EXPORT_SYMBOL(fiemap_check_flags);
154 
fiemap_check_ranges(struct super_block * sb,u64 start,u64 len,u64 * new_len)155 static int fiemap_check_ranges(struct super_block *sb,
156 			       u64 start, u64 len, u64 *new_len)
157 {
158 	u64 maxbytes = (u64) sb->s_maxbytes;
159 
160 	*new_len = len;
161 
162 	if (len == 0)
163 		return -EINVAL;
164 
165 	if (start > maxbytes)
166 		return -EFBIG;
167 
168 	/*
169 	 * Shrink request scope to what the fs can actually handle.
170 	 */
171 	if (len > maxbytes || (maxbytes - len) < start)
172 		*new_len = maxbytes - start;
173 
174 	return 0;
175 }
176 
ioctl_fiemap(struct file * filp,unsigned long arg)177 static int ioctl_fiemap(struct file *filp, unsigned long arg)
178 {
179 	struct fiemap fiemap;
180 	struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
181 	struct fiemap_extent_info fieinfo = { 0, };
182 	struct inode *inode = file_inode(filp);
183 	struct super_block *sb = inode->i_sb;
184 	u64 len;
185 	int error;
186 
187 	if (!inode->i_op->fiemap)
188 		return -EOPNOTSUPP;
189 
190 	if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
191 		return -EFAULT;
192 
193 	if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
194 		return -EINVAL;
195 
196 	error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
197 				    &len);
198 	if (error)
199 		return error;
200 
201 	fieinfo.fi_flags = fiemap.fm_flags;
202 	fieinfo.fi_extents_max = fiemap.fm_extent_count;
203 	fieinfo.fi_extents_start = ufiemap->fm_extents;
204 
205 	if (fiemap.fm_extent_count != 0 &&
206 	    !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
207 		       fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
208 		return -EFAULT;
209 
210 	if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
211 		filemap_write_and_wait(inode->i_mapping);
212 
213 	error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
214 	fiemap.fm_flags = fieinfo.fi_flags;
215 	fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
216 	if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
217 		error = -EFAULT;
218 
219 	return error;
220 }
221 
ioctl_file_clone(struct file * dst_file,unsigned long srcfd,u64 off,u64 olen,u64 destoff)222 static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
223 			     u64 off, u64 olen, u64 destoff)
224 {
225 	struct fd src_file = fdget(srcfd);
226 	int ret;
227 
228 	if (!src_file.file)
229 		return -EBADF;
230 	ret = -EXDEV;
231 	if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
232 		goto fdput;
233 	ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
234 fdput:
235 	fdput(src_file);
236 	return ret;
237 }
238 
ioctl_file_clone_range(struct file * file,void __user * argp)239 static long ioctl_file_clone_range(struct file *file, void __user *argp)
240 {
241 	struct file_clone_range args;
242 
243 	if (copy_from_user(&args, argp, sizeof(args)))
244 		return -EFAULT;
245 	return ioctl_file_clone(file, args.src_fd, args.src_offset,
246 				args.src_length, args.dest_offset);
247 }
248 
249 #ifdef CONFIG_BLOCK
250 
logical_to_blk(struct inode * inode,loff_t offset)251 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
252 {
253 	return (offset >> inode->i_blkbits);
254 }
255 
blk_to_logical(struct inode * inode,sector_t blk)256 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
257 {
258 	return (blk << inode->i_blkbits);
259 }
260 
261 /**
262  * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
263  * @inode: the inode to map
264  * @fieinfo: the fiemap info struct that will be passed back to userspace
265  * @start: where to start mapping in the inode
266  * @len: how much space to map
267  * @get_block: the fs's get_block function
268  *
269  * This does FIEMAP for block based inodes.  Basically it will just loop
270  * through get_block until we hit the number of extents we want to map, or we
271  * go past the end of the file and hit a hole.
272  *
273  * If it is possible to have data blocks beyond a hole past @inode->i_size, then
274  * please do not use this function, it will stop at the first unmapped block
275  * beyond i_size.
276  *
277  * If you use this function directly, you need to do your own locking. Use
278  * generic_block_fiemap if you want the locking done for you.
279  */
280 
__generic_block_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,loff_t start,loff_t len,get_block_t * get_block)281 int __generic_block_fiemap(struct inode *inode,
282 			   struct fiemap_extent_info *fieinfo, loff_t start,
283 			   loff_t len, get_block_t *get_block)
284 {
285 	struct buffer_head map_bh;
286 	sector_t start_blk, last_blk;
287 	loff_t isize = i_size_read(inode);
288 	u64 logical = 0, phys = 0, size = 0;
289 	u32 flags = FIEMAP_EXTENT_MERGED;
290 	bool past_eof = false, whole_file = false;
291 	int ret = 0;
292 
293 	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
294 	if (ret)
295 		return ret;
296 
297 	/*
298 	 * Either the i_mutex or other appropriate locking needs to be held
299 	 * since we expect isize to not change at all through the duration of
300 	 * this call.
301 	 */
302 	if (len >= isize) {
303 		whole_file = true;
304 		len = isize;
305 	}
306 
307 	/*
308 	 * Some filesystems can't deal with being asked to map less than
309 	 * blocksize, so make sure our len is at least block length.
310 	 */
311 	if (logical_to_blk(inode, len) == 0)
312 		len = blk_to_logical(inode, 1);
313 
314 	start_blk = logical_to_blk(inode, start);
315 	last_blk = logical_to_blk(inode, start + len - 1);
316 
317 	do {
318 		/*
319 		 * we set b_size to the total size we want so it will map as
320 		 * many contiguous blocks as possible at once
321 		 */
322 		memset(&map_bh, 0, sizeof(struct buffer_head));
323 		map_bh.b_size = len;
324 
325 		ret = get_block(inode, start_blk, &map_bh, 0);
326 		if (ret)
327 			break;
328 
329 		/* HOLE */
330 		if (!buffer_mapped(&map_bh)) {
331 			start_blk++;
332 
333 			/*
334 			 * We want to handle the case where there is an
335 			 * allocated block at the front of the file, and then
336 			 * nothing but holes up to the end of the file properly,
337 			 * to make sure that extent at the front gets properly
338 			 * marked with FIEMAP_EXTENT_LAST
339 			 */
340 			if (!past_eof &&
341 			    blk_to_logical(inode, start_blk) >= isize)
342 				past_eof = 1;
343 
344 			/*
345 			 * First hole after going past the EOF, this is our
346 			 * last extent
347 			 */
348 			if (past_eof && size) {
349 				flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
350 				ret = fiemap_fill_next_extent(fieinfo, logical,
351 							      phys, size,
352 							      flags);
353 			} else if (size) {
354 				ret = fiemap_fill_next_extent(fieinfo, logical,
355 							      phys, size, flags);
356 				size = 0;
357 			}
358 
359 			/* if we have holes up to/past EOF then we're done */
360 			if (start_blk > last_blk || past_eof || ret)
361 				break;
362 		} else {
363 			/*
364 			 * We have gone over the length of what we wanted to
365 			 * map, and it wasn't the entire file, so add the extent
366 			 * we got last time and exit.
367 			 *
368 			 * This is for the case where say we want to map all the
369 			 * way up to the second to the last block in a file, but
370 			 * the last block is a hole, making the second to last
371 			 * block FIEMAP_EXTENT_LAST.  In this case we want to
372 			 * see if there is a hole after the second to last block
373 			 * so we can mark it properly.  If we found data after
374 			 * we exceeded the length we were requesting, then we
375 			 * are good to go, just add the extent to the fieinfo
376 			 * and break
377 			 */
378 			if (start_blk > last_blk && !whole_file) {
379 				ret = fiemap_fill_next_extent(fieinfo, logical,
380 							      phys, size,
381 							      flags);
382 				break;
383 			}
384 
385 			/*
386 			 * if size != 0 then we know we already have an extent
387 			 * to add, so add it.
388 			 */
389 			if (size) {
390 				ret = fiemap_fill_next_extent(fieinfo, logical,
391 							      phys, size,
392 							      flags);
393 				if (ret)
394 					break;
395 			}
396 
397 			logical = blk_to_logical(inode, start_blk);
398 			phys = blk_to_logical(inode, map_bh.b_blocknr);
399 			size = map_bh.b_size;
400 			flags = FIEMAP_EXTENT_MERGED;
401 
402 			start_blk += logical_to_blk(inode, size);
403 
404 			/*
405 			 * If we are past the EOF, then we need to make sure as
406 			 * soon as we find a hole that the last extent we found
407 			 * is marked with FIEMAP_EXTENT_LAST
408 			 */
409 			if (!past_eof && logical + size >= isize)
410 				past_eof = true;
411 		}
412 		cond_resched();
413 		if (fatal_signal_pending(current)) {
414 			ret = -EINTR;
415 			break;
416 		}
417 
418 	} while (1);
419 
420 	/* If ret is 1 then we just hit the end of the extent array */
421 	if (ret == 1)
422 		ret = 0;
423 
424 	return ret;
425 }
426 EXPORT_SYMBOL(__generic_block_fiemap);
427 
428 /**
429  * generic_block_fiemap - FIEMAP for block based inodes
430  * @inode: The inode to map
431  * @fieinfo: The mapping information
432  * @start: The initial block to map
433  * @len: The length of the extect to attempt to map
434  * @get_block: The block mapping function for the fs
435  *
436  * Calls __generic_block_fiemap to map the inode, after taking
437  * the inode's mutex lock.
438  */
439 
generic_block_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 len,get_block_t * get_block)440 int generic_block_fiemap(struct inode *inode,
441 			 struct fiemap_extent_info *fieinfo, u64 start,
442 			 u64 len, get_block_t *get_block)
443 {
444 	int ret;
445 	inode_lock(inode);
446 	ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
447 	inode_unlock(inode);
448 	return ret;
449 }
450 EXPORT_SYMBOL(generic_block_fiemap);
451 
452 #endif  /*  CONFIG_BLOCK  */
453 
454 /*
455  * This provides compatibility with legacy XFS pre-allocation ioctls
456  * which predate the fallocate syscall.
457  *
458  * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
459  * are used here, rest are ignored.
460  */
ioctl_preallocate(struct file * filp,void __user * argp)461 int ioctl_preallocate(struct file *filp, void __user *argp)
462 {
463 	struct inode *inode = file_inode(filp);
464 	struct space_resv sr;
465 
466 	if (copy_from_user(&sr, argp, sizeof(sr)))
467 		return -EFAULT;
468 
469 	switch (sr.l_whence) {
470 	case SEEK_SET:
471 		break;
472 	case SEEK_CUR:
473 		sr.l_start += filp->f_pos;
474 		break;
475 	case SEEK_END:
476 		sr.l_start += i_size_read(inode);
477 		break;
478 	default:
479 		return -EINVAL;
480 	}
481 
482 	return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
483 }
484 
file_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)485 static int file_ioctl(struct file *filp, unsigned int cmd,
486 		unsigned long arg)
487 {
488 	struct inode *inode = file_inode(filp);
489 	int __user *p = (int __user *)arg;
490 
491 	switch (cmd) {
492 	case FIBMAP:
493 		return ioctl_fibmap(filp, p);
494 	case FIONREAD:
495 		return put_user(i_size_read(inode) - filp->f_pos, p);
496 	case FS_IOC_RESVSP:
497 	case FS_IOC_RESVSP64:
498 		return ioctl_preallocate(filp, p);
499 	}
500 
501 	return vfs_ioctl(filp, cmd, arg);
502 }
503 
ioctl_fionbio(struct file * filp,int __user * argp)504 static int ioctl_fionbio(struct file *filp, int __user *argp)
505 {
506 	unsigned int flag;
507 	int on, error;
508 
509 	error = get_user(on, argp);
510 	if (error)
511 		return error;
512 	flag = O_NONBLOCK;
513 #ifdef __sparc__
514 	/* SunOS compatibility item. */
515 	if (O_NONBLOCK != O_NDELAY)
516 		flag |= O_NDELAY;
517 #endif
518 	spin_lock(&filp->f_lock);
519 	if (on)
520 		filp->f_flags |= flag;
521 	else
522 		filp->f_flags &= ~flag;
523 	spin_unlock(&filp->f_lock);
524 	return error;
525 }
526 
ioctl_fioasync(unsigned int fd,struct file * filp,int __user * argp)527 static int ioctl_fioasync(unsigned int fd, struct file *filp,
528 			  int __user *argp)
529 {
530 	unsigned int flag;
531 	int on, error;
532 
533 	error = get_user(on, argp);
534 	if (error)
535 		return error;
536 	flag = on ? FASYNC : 0;
537 
538 	/* Did FASYNC state change ? */
539 	if ((flag ^ filp->f_flags) & FASYNC) {
540 		if (filp->f_op->fasync)
541 			/* fasync() adjusts filp->f_flags */
542 			error = filp->f_op->fasync(fd, filp, on);
543 		else
544 			error = -ENOTTY;
545 	}
546 	return error < 0 ? error : 0;
547 }
548 
ioctl_fsfreeze(struct file * filp)549 static int ioctl_fsfreeze(struct file *filp)
550 {
551 	struct super_block *sb = file_inode(filp)->i_sb;
552 
553 	if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
554 		return -EPERM;
555 
556 	/* If filesystem doesn't support freeze feature, return. */
557 	if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
558 		return -EOPNOTSUPP;
559 
560 	/* Freeze */
561 	if (sb->s_op->freeze_super)
562 		return sb->s_op->freeze_super(sb);
563 	return freeze_super(sb);
564 }
565 
ioctl_fsthaw(struct file * filp)566 static int ioctl_fsthaw(struct file *filp)
567 {
568 	struct super_block *sb = file_inode(filp)->i_sb;
569 
570 	if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
571 		return -EPERM;
572 
573 	/* Thaw */
574 	if (sb->s_op->thaw_super)
575 		return sb->s_op->thaw_super(sb);
576 	return thaw_super(sb);
577 }
578 
ioctl_file_dedupe_range(struct file * file,void __user * arg)579 static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
580 {
581 	struct file_dedupe_range __user *argp = arg;
582 	struct file_dedupe_range *same = NULL;
583 	int ret;
584 	unsigned long size;
585 	u16 count;
586 
587 	if (get_user(count, &argp->dest_count)) {
588 		ret = -EFAULT;
589 		goto out;
590 	}
591 
592 	size = offsetof(struct file_dedupe_range __user, info[count]);
593 	if (size > PAGE_SIZE) {
594 		ret = -ENOMEM;
595 		goto out;
596 	}
597 
598 	same = memdup_user(argp, size);
599 	if (IS_ERR(same)) {
600 		ret = PTR_ERR(same);
601 		same = NULL;
602 		goto out;
603 	}
604 
605 	same->dest_count = count;
606 	ret = vfs_dedupe_file_range(file, same);
607 	if (ret)
608 		goto out;
609 
610 	ret = copy_to_user(argp, same, size);
611 	if (ret)
612 		ret = -EFAULT;
613 
614 out:
615 	kfree(same);
616 	return ret;
617 }
618 
619 /*
620  * When you add any new common ioctls to the switches above and below
621  * please update compat_sys_ioctl() too.
622  *
623  * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
624  * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
625  */
do_vfs_ioctl(struct file * filp,unsigned int fd,unsigned int cmd,unsigned long arg)626 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
627 	     unsigned long arg)
628 {
629 	int error = 0;
630 	int __user *argp = (int __user *)arg;
631 	struct inode *inode = file_inode(filp);
632 
633 	switch (cmd) {
634 	case FIOCLEX:
635 		set_close_on_exec(fd, 1);
636 		break;
637 
638 	case FIONCLEX:
639 		set_close_on_exec(fd, 0);
640 		break;
641 
642 	case FIONBIO:
643 		error = ioctl_fionbio(filp, argp);
644 		break;
645 
646 	case FIOASYNC:
647 		error = ioctl_fioasync(fd, filp, argp);
648 		break;
649 
650 	case FIOQSIZE:
651 		if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
652 		    S_ISLNK(inode->i_mode)) {
653 			loff_t res = inode_get_bytes(inode);
654 			error = copy_to_user(argp, &res, sizeof(res)) ?
655 					-EFAULT : 0;
656 		} else
657 			error = -ENOTTY;
658 		break;
659 
660 	case FIFREEZE:
661 		error = ioctl_fsfreeze(filp);
662 		break;
663 
664 	case FITHAW:
665 		error = ioctl_fsthaw(filp);
666 		break;
667 
668 	case FS_IOC_FIEMAP:
669 		return ioctl_fiemap(filp, arg);
670 
671 	case FIGETBSZ:
672 		/* anon_bdev filesystems may not have a block size */
673 		if (!inode->i_sb->s_blocksize)
674 			return -EINVAL;
675 		return put_user(inode->i_sb->s_blocksize, argp);
676 
677 	case FICLONE:
678 		return ioctl_file_clone(filp, arg, 0, 0, 0);
679 
680 	case FICLONERANGE:
681 		return ioctl_file_clone_range(filp, argp);
682 
683 	case FIDEDUPERANGE:
684 		return ioctl_file_dedupe_range(filp, argp);
685 
686 	default:
687 		if (S_ISREG(inode->i_mode))
688 			error = file_ioctl(filp, cmd, arg);
689 		else
690 			error = vfs_ioctl(filp, cmd, arg);
691 		break;
692 	}
693 	return error;
694 }
695 
ksys_ioctl(unsigned int fd,unsigned int cmd,unsigned long arg)696 int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
697 {
698 	int error;
699 	struct fd f = fdget(fd);
700 
701 	if (!f.file)
702 		return -EBADF;
703 	error = security_file_ioctl(f.file, cmd, arg);
704 	if (!error)
705 		error = do_vfs_ioctl(f.file, fd, cmd, arg);
706 	fdput(f);
707 	return error;
708 }
709 
SYSCALL_DEFINE3(ioctl,unsigned int,fd,unsigned int,cmd,unsigned long,arg)710 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
711 {
712 	return ksys_ioctl(fd, cmd, arg);
713 }
714