blob: 84c6e79829ab0ebb3b257c63b8cf34485288d401 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ioctl.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/syscalls.h>
8#include <linux/mm.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -08009#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/file.h>
11#include <linux/fs.h>
12#include <linux/security.h>
Paul Gortmaker630d9c42011-11-16 23:57:37 -050013#include <linux/export.h>
Erez Zadokc9845ff2008-02-07 00:13:23 -080014#include <linux/uaccess.h>
Josef Bacik68c9d702008-10-03 17:32:43 -040015#include <linux/writeback.h>
16#include <linux/buffer_head.h>
Ankit Jain3e63cbb2009-06-19 14:28:07 -040017#include <linux/falloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/ioctls.h>
20
Mark Fashehc4b929b2008-10-08 19:44:18 -040021/* 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
Erez Zadokdeb21db2008-02-07 00:13:25 -080024/**
25 * vfs_ioctl - call filesystem specific ioctl methods
Christoph Hellwigf6a4c8b2008-02-09 00:10:16 -080026 * @filp: open file to invoke ioctl method on
27 * @cmd: ioctl command to execute
28 * @arg: command-specific argument for ioctl
Erez Zadokdeb21db2008-02-07 00:13:25 -080029 *
30 * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
Erez Zadokdeb21db2008-02-07 00:13:25 -080031 * returns -ENOTTY.
32 *
33 * Returns 0 on success, -errno on error.
34 */
Adrian Bunk67cde592008-04-29 00:58:55 -070035static long vfs_ioctl(struct file *filp, unsigned int cmd,
36 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
38 int error = -ENOTTY;
39
Al Viro72c2d532013-09-22 16:27:52 -040040 if (!filp->f_op->unlocked_ioctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 goto out;
42
Arnd Bergmannb19dd422010-07-04 00:15:10 +020043 error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
44 if (error == -ENOIOCTLCMD)
Linus Torvalds07d106d2012-01-05 15:40:12 -080045 error = -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 out:
47 return error;
48}
49
Erez Zadokaa81a7c2008-02-07 00:13:25 -080050static 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;
Erez Zadokaa81a7c2008-02-07 00:13:25 -080063 res = mapping->a_ops->bmap(mapping, block);
Erez Zadokaa81a7c2008-02-07 00:13:25 -080064 return put_user(res, p);
65}
66
Mark Fashehc4b929b2008-10-08 19:44:18 -040067/**
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;
Namhyung Kimecf56322011-01-16 23:28:17 +090089 struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
Mark Fashehc4b929b2008-10-08 19:44:18 -040090
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{
Jeff Layton5aa98b72009-09-18 13:05:50 -0700154 u64 maxbytes = (u64) sb->s_maxbytes;
155
Mark Fashehc4b929b2008-10-08 19:44:18 -0400156 *new_len = len;
157
158 if (len == 0)
159 return -EINVAL;
160
Jeff Layton5aa98b72009-09-18 13:05:50 -0700161 if (start > maxbytes)
Mark Fashehc4b929b2008-10-08 19:44:18 -0400162 return -EFBIG;
163
164 /*
165 * Shrink request scope to what the fs can actually handle.
166 */
Jeff Layton5aa98b72009-09-18 13:05:50 -0700167 if (len > maxbytes || (maxbytes - len) < start)
168 *new_len = maxbytes - start;
Mark Fashehc4b929b2008-10-08 19:44:18 -0400169
170 return 0;
171}
172
173static int ioctl_fiemap(struct file *filp, unsigned long arg)
174{
175 struct fiemap fiemap;
Namhyung Kimecf56322011-01-16 23:28:17 +0900176 struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
Mark Fashehc4b929b2008-10-08 19:44:18 -0400177 struct fiemap_extent_info fieinfo = { 0, };
Al Viro496ad9a2013-01-23 17:07:38 -0500178 struct inode *inode = file_inode(filp);
Mark Fashehc4b929b2008-10-08 19:44:18 -0400179 struct super_block *sb = inode->i_sb;
180 u64 len;
181 int error;
182
183 if (!inode->i_op->fiemap)
184 return -EOPNOTSUPP;
185
Namhyung Kimecf56322011-01-16 23:28:17 +0900186 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
Mark Fashehc4b929b2008-10-08 19:44:18 -0400187 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;
Namhyung Kimecf56322011-01-16 23:28:17 +0900199 fieinfo.fi_extents_start = ufiemap->fm_extents;
Mark Fashehc4b929b2008-10-08 19:44:18 -0400200
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;
Namhyung Kimecf56322011-01-16 23:28:17 +0900212 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
Mark Fashehc4b929b2008-10-08 19:44:18 -0400213 error = -EFAULT;
214
215 return error;
216}
217
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100218static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
219 u64 off, u64 olen, u64 destoff)
220{
221 struct fd src_file = fdget(srcfd);
222 int ret;
223
224 if (!src_file.file)
225 return -EBADF;
226 ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
227 fdput(src_file);
228 return ret;
229}
230
231static long ioctl_file_clone_range(struct file *file, void __user *argp)
232{
233 struct file_clone_range args;
234
235 if (copy_from_user(&args, argp, sizeof(args)))
236 return -EFAULT;
237 return ioctl_file_clone(file, args.src_fd, args.src_offset,
238 args.src_length, args.dest_offset);
239}
240
Adrian Bunk06270d52008-10-12 07:15:19 +0300241#ifdef CONFIG_BLOCK
242
Josef Bacik3a3076f2010-04-23 12:17:17 -0400243static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
244{
245 return (offset >> inode->i_blkbits);
246}
247
248static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
249{
250 return (blk << inode->i_blkbits);
251}
Josef Bacik68c9d702008-10-03 17:32:43 -0400252
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100253/**
254 * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
Josef Bacik3a3076f2010-04-23 12:17:17 -0400255 * @inode: the inode to map
256 * @fieinfo: the fiemap info struct that will be passed back to userspace
257 * @start: where to start mapping in the inode
258 * @len: how much space to map
259 * @get_block: the fs's get_block function
Josef Bacik68c9d702008-10-03 17:32:43 -0400260 *
261 * This does FIEMAP for block based inodes. Basically it will just loop
262 * through get_block until we hit the number of extents we want to map, or we
263 * go past the end of the file and hit a hole.
264 *
265 * If it is possible to have data blocks beyond a hole past @inode->i_size, then
266 * please do not use this function, it will stop at the first unmapped block
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100267 * beyond i_size.
268 *
269 * If you use this function directly, you need to do your own locking. Use
270 * generic_block_fiemap if you want the locking done for you.
Josef Bacik68c9d702008-10-03 17:32:43 -0400271 */
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100272
273int __generic_block_fiemap(struct inode *inode,
Josef Bacik3a3076f2010-04-23 12:17:17 -0400274 struct fiemap_extent_info *fieinfo, loff_t start,
275 loff_t len, get_block_t *get_block)
Josef Bacik68c9d702008-10-03 17:32:43 -0400276{
Josef Bacik3a3076f2010-04-23 12:17:17 -0400277 struct buffer_head map_bh;
278 sector_t start_blk, last_blk;
279 loff_t isize = i_size_read(inode);
Josef Bacik68c9d702008-10-03 17:32:43 -0400280 u64 logical = 0, phys = 0, size = 0;
281 u32 flags = FIEMAP_EXTENT_MERGED;
Josef Bacik3a3076f2010-04-23 12:17:17 -0400282 bool past_eof = false, whole_file = false;
283 int ret = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400284
Josef Bacik3a3076f2010-04-23 12:17:17 -0400285 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
286 if (ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400287 return ret;
288
Josef Bacik3a3076f2010-04-23 12:17:17 -0400289 /*
290 * Either the i_mutex or other appropriate locking needs to be held
291 * since we expect isize to not change at all through the duration of
292 * this call.
293 */
294 if (len >= isize) {
295 whole_file = true;
296 len = isize;
297 }
298
Josef Bacikd54cdc82011-02-01 15:52:47 -0800299 /*
300 * Some filesystems can't deal with being asked to map less than
301 * blocksize, so make sure our len is at least block length.
302 */
303 if (logical_to_blk(inode, len) == 0)
304 len = blk_to_logical(inode, 1);
305
Josef Bacik68c9d702008-10-03 17:32:43 -0400306 start_blk = logical_to_blk(inode, start);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400307 last_blk = logical_to_blk(inode, start + len - 1);
Josef Bacik68c9d702008-10-03 17:32:43 -0400308
309 do {
310 /*
311 * we set b_size to the total size we want so it will map as
312 * many contiguous blocks as possible at once
313 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400314 memset(&map_bh, 0, sizeof(struct buffer_head));
315 map_bh.b_size = len;
Josef Bacik68c9d702008-10-03 17:32:43 -0400316
Josef Bacik3a3076f2010-04-23 12:17:17 -0400317 ret = get_block(inode, start_blk, &map_bh, 0);
Josef Bacik68c9d702008-10-03 17:32:43 -0400318 if (ret)
319 break;
320
321 /* HOLE */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400322 if (!buffer_mapped(&map_bh)) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700323 start_blk++;
324
325 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400326 * We want to handle the case where there is an
Josef Bacikdf3935f2009-05-06 16:02:53 -0700327 * allocated block at the front of the file, and then
328 * nothing but holes up to the end of the file properly,
329 * to make sure that extent at the front gets properly
330 * marked with FIEMAP_EXTENT_LAST
331 */
332 if (!past_eof &&
Josef Bacik3a3076f2010-04-23 12:17:17 -0400333 blk_to_logical(inode, start_blk) >= isize)
Josef Bacikdf3935f2009-05-06 16:02:53 -0700334 past_eof = 1;
335
Josef Bacik68c9d702008-10-03 17:32:43 -0400336 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400337 * First hole after going past the EOF, this is our
Josef Bacik68c9d702008-10-03 17:32:43 -0400338 * last extent
339 */
Josef Bacikdf3935f2009-05-06 16:02:53 -0700340 if (past_eof && size) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400341 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
342 ret = fiemap_fill_next_extent(fieinfo, logical,
343 phys, size,
344 flags);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400345 } else if (size) {
346 ret = fiemap_fill_next_extent(fieinfo, logical,
347 phys, size, flags);
348 size = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400349 }
350
Josef Bacik68c9d702008-10-03 17:32:43 -0400351 /* if we have holes up to/past EOF then we're done */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400352 if (start_blk > last_blk || past_eof || ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400353 break;
Josef Bacik68c9d702008-10-03 17:32:43 -0400354 } else {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700355 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400356 * We have gone over the length of what we wanted to
Josef Bacikdf3935f2009-05-06 16:02:53 -0700357 * map, and it wasn't the entire file, so add the extent
358 * we got last time and exit.
359 *
360 * This is for the case where say we want to map all the
361 * way up to the second to the last block in a file, but
362 * the last block is a hole, making the second to last
363 * block FIEMAP_EXTENT_LAST. In this case we want to
364 * see if there is a hole after the second to last block
365 * so we can mark it properly. If we found data after
366 * we exceeded the length we were requesting, then we
367 * are good to go, just add the extent to the fieinfo
368 * and break
369 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400370 if (start_blk > last_blk && !whole_file) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700371 ret = fiemap_fill_next_extent(fieinfo, logical,
372 phys, size,
373 flags);
374 break;
375 }
376
377 /*
378 * if size != 0 then we know we already have an extent
379 * to add, so add it.
380 */
381 if (size) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400382 ret = fiemap_fill_next_extent(fieinfo, logical,
383 phys, size,
384 flags);
385 if (ret)
386 break;
387 }
388
389 logical = blk_to_logical(inode, start_blk);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400390 phys = blk_to_logical(inode, map_bh.b_blocknr);
391 size = map_bh.b_size;
Josef Bacik68c9d702008-10-03 17:32:43 -0400392 flags = FIEMAP_EXTENT_MERGED;
393
Josef Bacik68c9d702008-10-03 17:32:43 -0400394 start_blk += logical_to_blk(inode, size);
395
396 /*
Josef Bacikdf3935f2009-05-06 16:02:53 -0700397 * If we are past the EOF, then we need to make sure as
398 * soon as we find a hole that the last extent we found
399 * is marked with FIEMAP_EXTENT_LAST
Josef Bacik68c9d702008-10-03 17:32:43 -0400400 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400401 if (!past_eof && logical + size >= isize)
402 past_eof = true;
Josef Bacik68c9d702008-10-03 17:32:43 -0400403 }
404 cond_resched();
Dmitry Monakhov913e0272015-02-10 14:09:29 -0800405 if (fatal_signal_pending(current)) {
406 ret = -EINTR;
407 break;
408 }
409
Josef Bacik68c9d702008-10-03 17:32:43 -0400410 } while (1);
411
Josef Bacik3a3076f2010-04-23 12:17:17 -0400412 /* If ret is 1 then we just hit the end of the extent array */
Josef Bacik68c9d702008-10-03 17:32:43 -0400413 if (ret == 1)
414 ret = 0;
415
416 return ret;
417}
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100418EXPORT_SYMBOL(__generic_block_fiemap);
419
420/**
421 * generic_block_fiemap - FIEMAP for block based inodes
422 * @inode: The inode to map
423 * @fieinfo: The mapping information
424 * @start: The initial block to map
425 * @len: The length of the extect to attempt to map
426 * @get_block: The block mapping function for the fs
427 *
428 * Calls __generic_block_fiemap to map the inode, after taking
429 * the inode's mutex lock.
430 */
431
432int generic_block_fiemap(struct inode *inode,
433 struct fiemap_extent_info *fieinfo, u64 start,
434 u64 len, get_block_t *get_block)
435{
436 int ret;
437 mutex_lock(&inode->i_mutex);
438 ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
439 mutex_unlock(&inode->i_mutex);
440 return ret;
441}
Josef Bacik68c9d702008-10-03 17:32:43 -0400442EXPORT_SYMBOL(generic_block_fiemap);
443
Adrian Bunk06270d52008-10-12 07:15:19 +0300444#endif /* CONFIG_BLOCK */
445
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400446/*
447 * This provides compatibility with legacy XFS pre-allocation ioctls
448 * which predate the fallocate syscall.
449 *
450 * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
451 * are used here, rest are ignored.
452 */
453int ioctl_preallocate(struct file *filp, void __user *argp)
454{
Al Viro496ad9a2013-01-23 17:07:38 -0500455 struct inode *inode = file_inode(filp);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400456 struct space_resv sr;
457
458 if (copy_from_user(&sr, argp, sizeof(sr)))
459 return -EFAULT;
460
461 switch (sr.l_whence) {
462 case SEEK_SET:
463 break;
464 case SEEK_CUR:
465 sr.l_start += filp->f_pos;
466 break;
467 case SEEK_END:
468 sr.l_start += i_size_read(inode);
469 break;
470 default:
471 return -EINVAL;
472 }
473
Anna Schumaker72c72bd2014-11-07 14:44:25 -0500474 return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400475}
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477static int file_ioctl(struct file *filp, unsigned int cmd,
478 unsigned long arg)
479{
Al Viro496ad9a2013-01-23 17:07:38 -0500480 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 int __user *p = (int __user *)arg;
482
483 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800484 case FIBMAP:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800485 return ioctl_fibmap(filp, p);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800486 case FIONREAD:
487 return put_user(i_size_read(inode) - filp->f_pos, p);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400488 case FS_IOC_RESVSP:
489 case FS_IOC_RESVSP64:
490 return ioctl_preallocate(filp, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492
Erez Zadokdeb21db2008-02-07 00:13:25 -0800493 return vfs_ioctl(filp, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800496static int ioctl_fionbio(struct file *filp, int __user *argp)
497{
498 unsigned int flag;
499 int on, error;
500
501 error = get_user(on, argp);
502 if (error)
503 return error;
504 flag = O_NONBLOCK;
505#ifdef __sparc__
506 /* SunOS compatibility item. */
507 if (O_NONBLOCK != O_NDELAY)
508 flag |= O_NDELAY;
509#endif
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700510 spin_lock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800511 if (on)
512 filp->f_flags |= flag;
513 else
514 filp->f_flags &= ~flag;
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700515 spin_unlock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800516 return error;
517}
518
519static int ioctl_fioasync(unsigned int fd, struct file *filp,
520 int __user *argp)
521{
522 unsigned int flag;
523 int on, error;
524
525 error = get_user(on, argp);
526 if (error)
527 return error;
528 flag = on ? FASYNC : 0;
529
530 /* Did FASYNC state change ? */
531 if ((flag ^ filp->f_flags) & FASYNC) {
Al Viro72c2d532013-09-22 16:27:52 -0400532 if (filp->f_op->fasync)
Jonathan Corbet76398422009-02-01 14:26:59 -0700533 /* fasync() adjusts filp->f_flags */
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800534 error = filp->f_op->fasync(fd, filp, on);
Jonathan Corbet218d11a2008-12-05 16:12:48 -0700535 else
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800536 error = -ENOTTY;
537 }
Jonathan Corbet60aa4922009-02-01 14:52:56 -0700538 return error < 0 ? error : 0;
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800539}
540
Takashi Satofcccf502009-01-09 16:40:59 -0800541static int ioctl_fsfreeze(struct file *filp)
542{
Al Viro496ad9a2013-01-23 17:07:38 -0500543 struct super_block *sb = file_inode(filp)->i_sb;
Takashi Satofcccf502009-01-09 16:40:59 -0800544
545 if (!capable(CAP_SYS_ADMIN))
546 return -EPERM;
547
548 /* If filesystem doesn't support freeze feature, return. */
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -0600549 if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
Takashi Satofcccf502009-01-09 16:40:59 -0800550 return -EOPNOTSUPP;
551
Takashi Satofcccf502009-01-09 16:40:59 -0800552 /* Freeze */
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -0600553 if (sb->s_op->freeze_super)
554 return sb->s_op->freeze_super(sb);
Josef Bacik18e9e512010-03-23 10:34:56 -0400555 return freeze_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800556}
557
558static int ioctl_fsthaw(struct file *filp)
559{
Al Viro496ad9a2013-01-23 17:07:38 -0500560 struct super_block *sb = file_inode(filp)->i_sb;
Takashi Satofcccf502009-01-09 16:40:59 -0800561
562 if (!capable(CAP_SYS_ADMIN))
563 return -EPERM;
564
Takashi Satofcccf502009-01-09 16:40:59 -0800565 /* Thaw */
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -0600566 if (sb->s_op->thaw_super)
567 return sb->s_op->thaw_super(sb);
Josef Bacik18e9e512010-03-23 10:34:56 -0400568 return thaw_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800569}
570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571/*
572 * When you add any new common ioctls to the switches above and below
573 * please update compat_sys_ioctl() too.
574 *
Erez Zadokdeb21db2008-02-07 00:13:25 -0800575 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
577 */
Erez Zadokdeb21db2008-02-07 00:13:25 -0800578int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
579 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800581 int error = 0;
582 int __user *argp = (int __user *)arg;
Al Viro496ad9a2013-01-23 17:07:38 -0500583 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800586 case FIOCLEX:
587 set_close_on_exec(fd, 1);
588 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Erez Zadokc9845ff2008-02-07 00:13:23 -0800590 case FIONCLEX:
591 set_close_on_exec(fd, 0);
592 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Erez Zadokc9845ff2008-02-07 00:13:23 -0800594 case FIONBIO:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800595 error = ioctl_fionbio(filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800596 break;
597
598 case FIOASYNC:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800599 error = ioctl_fioasync(fd, filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800600 break;
601
602 case FIOQSIZE:
Namhyung Kim27a4f7e62011-01-17 00:48:17 +0900603 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
604 S_ISLNK(inode->i_mode)) {
605 loff_t res = inode_get_bytes(inode);
606 error = copy_to_user(argp, &res, sizeof(res)) ?
607 -EFAULT : 0;
Erez Zadokc9845ff2008-02-07 00:13:23 -0800608 } else
609 error = -ENOTTY;
610 break;
Takashi Satofcccf502009-01-09 16:40:59 -0800611
612 case FIFREEZE:
613 error = ioctl_fsfreeze(filp);
614 break;
615
616 case FITHAW:
617 error = ioctl_fsthaw(filp);
618 break;
619
Aneesh Kumar K.V19ba0552009-05-13 18:12:05 -0400620 case FS_IOC_FIEMAP:
621 return ioctl_fiemap(filp, arg);
622
623 case FIGETBSZ:
Namhyung Kim27a4f7e62011-01-17 00:48:17 +0900624 return put_user(inode->i_sb->s_blocksize, argp);
Aneesh Kumar K.V19ba0552009-05-13 18:12:05 -0400625
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100626 case FICLONE:
627 return ioctl_file_clone(filp, arg, 0, 0, 0);
628
629 case FICLONERANGE:
630 return ioctl_file_clone_range(filp, argp);
631
Erez Zadokc9845ff2008-02-07 00:13:23 -0800632 default:
Namhyung Kim27a4f7e62011-01-17 00:48:17 +0900633 if (S_ISREG(inode->i_mode))
Erez Zadokc9845ff2008-02-07 00:13:23 -0800634 error = file_ioctl(filp, cmd, arg);
635 else
Erez Zadokdeb21db2008-02-07 00:13:25 -0800636 error = vfs_ioctl(filp, cmd, arg);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800637 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 }
639 return error;
640}
641
Heiko Carstensa26eab22009-01-14 14:14:17 +0100642SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643{
Al Viro2903ff02012-08-28 12:52:22 -0400644 int error;
645 struct fd f = fdget(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Al Viro2903ff02012-08-28 12:52:22 -0400647 if (!f.file)
648 return -EBADF;
649 error = security_file_ioctl(f.file, cmd, arg);
650 if (!error)
651 error = do_vfs_ioctl(f.file, fd, cmd, arg);
652 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 return error;
654}