blob: 3212c29235ce34d21dedc26ea569978d45462706 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * linux/fs/ioctl.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/syscalls.h>
9#include <linux/mm.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080010#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/file.h>
12#include <linux/fs.h>
13#include <linux/security.h>
Paul Gortmaker630d9c42011-11-16 23:57:37 -050014#include <linux/export.h>
Erez Zadokc9845ff2008-02-07 00:13:23 -080015#include <linux/uaccess.h>
Josef Bacik68c9d702008-10-03 17:32:43 -040016#include <linux/writeback.h>
17#include <linux/buffer_head.h>
Ankit Jain3e63cbb2009-06-19 14:28:07 -040018#include <linux/falloc.h>
Ingo Molnarf361bf42017-02-03 23:47:37 +010019#include <linux/sched/signal.h>
20
Al Viro66cf1912016-01-07 09:53:30 -050021#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/ioctls.h>
24
Mark Fashehc4b929b2008-10-08 19:44:18 -040025/* 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
Erez Zadokdeb21db2008-02-07 00:13:25 -080028/**
29 * vfs_ioctl - call filesystem specific ioctl methods
Christoph Hellwigf6a4c8b2008-02-09 00:10:16 -080030 * @filp: open file to invoke ioctl method on
31 * @cmd: ioctl command to execute
32 * @arg: command-specific argument for ioctl
Erez Zadokdeb21db2008-02-07 00:13:25 -080033 *
34 * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
Erez Zadokdeb21db2008-02-07 00:13:25 -080035 * returns -ENOTTY.
36 *
37 * Returns 0 on success, -errno on error.
38 */
Al Viro66cf1912016-01-07 09:53:30 -050039long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
41 int error = -ENOTTY;
42
Al Viro72c2d532013-09-22 16:27:52 -040043 if (!filp->f_op->unlocked_ioctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 goto out;
45
Arnd Bergmannb19dd422010-07-04 00:15:10 +020046 error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
47 if (error == -ENOIOCTLCMD)
Linus Torvalds07d106d2012-01-05 15:40:12 -080048 error = -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 out:
50 return error;
51}
Miklos Szeredi9df67022018-07-18 15:44:40 +020052EXPORT_SYMBOL(vfs_ioctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Erez Zadokaa81a7c2008-02-07 00:13:25 -080054static 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;
Erez Zadokaa81a7c2008-02-07 00:13:25 -080067 res = mapping->a_ops->bmap(mapping, block);
Erez Zadokaa81a7c2008-02-07 00:13:25 -080068 return put_user(res, p);
69}
70
Mark Fashehc4b929b2008-10-08 19:44:18 -040071/**
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)
89int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
90 u64 phys, u64 len, u32 flags)
91{
92 struct fiemap_extent extent;
Namhyung Kimecf56322011-01-16 23:28:17 +090093 struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
Mark Fashehc4b929b2008-10-08 19:44:18 -040094
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}
126EXPORT_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 */
142int 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}
153EXPORT_SYMBOL(fiemap_check_flags);
154
155static int fiemap_check_ranges(struct super_block *sb,
156 u64 start, u64 len, u64 *new_len)
157{
Jeff Layton5aa98b72009-09-18 13:05:50 -0700158 u64 maxbytes = (u64) sb->s_maxbytes;
159
Mark Fashehc4b929b2008-10-08 19:44:18 -0400160 *new_len = len;
161
162 if (len == 0)
163 return -EINVAL;
164
Jeff Layton5aa98b72009-09-18 13:05:50 -0700165 if (start > maxbytes)
Mark Fashehc4b929b2008-10-08 19:44:18 -0400166 return -EFBIG;
167
168 /*
169 * Shrink request scope to what the fs can actually handle.
170 */
Jeff Layton5aa98b72009-09-18 13:05:50 -0700171 if (len > maxbytes || (maxbytes - len) < start)
172 *new_len = maxbytes - start;
Mark Fashehc4b929b2008-10-08 19:44:18 -0400173
174 return 0;
175}
176
177static int ioctl_fiemap(struct file *filp, unsigned long arg)
178{
179 struct fiemap fiemap;
Namhyung Kimecf56322011-01-16 23:28:17 +0900180 struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
Mark Fashehc4b929b2008-10-08 19:44:18 -0400181 struct fiemap_extent_info fieinfo = { 0, };
Al Viro496ad9a2013-01-23 17:07:38 -0500182 struct inode *inode = file_inode(filp);
Mark Fashehc4b929b2008-10-08 19:44:18 -0400183 struct super_block *sb = inode->i_sb;
184 u64 len;
185 int error;
186
187 if (!inode->i_op->fiemap)
188 return -EOPNOTSUPP;
189
Namhyung Kimecf56322011-01-16 23:28:17 +0900190 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
Mark Fashehc4b929b2008-10-08 19:44:18 -0400191 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;
Namhyung Kimecf56322011-01-16 23:28:17 +0900203 fieinfo.fi_extents_start = ufiemap->fm_extents;
Mark Fashehc4b929b2008-10-08 19:44:18 -0400204
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;
Namhyung Kimecf56322011-01-16 23:28:17 +0900216 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
Mark Fashehc4b929b2008-10-08 19:44:18 -0400217 error = -EFAULT;
218
219 return error;
220}
221
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100222static 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;
Amir Goldstein913b86e2016-09-23 11:38:10 +0300230 ret = -EXDEV;
231 if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
232 goto fdput;
Amir Goldstein031a0722016-09-23 11:38:11 +0300233 ret = do_clone_file_range(src_file.file, off, dst_file, destoff, olen);
Amir Goldstein913b86e2016-09-23 11:38:10 +0300234fdput:
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100235 fdput(src_file);
236 return ret;
237}
238
239static 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
Adrian Bunk06270d52008-10-12 07:15:19 +0300249#ifdef CONFIG_BLOCK
250
Josef Bacik3a3076f2010-04-23 12:17:17 -0400251static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
252{
253 return (offset >> inode->i_blkbits);
254}
255
256static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
257{
258 return (blk << inode->i_blkbits);
259}
Josef Bacik68c9d702008-10-03 17:32:43 -0400260
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100261/**
262 * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
Josef Bacik3a3076f2010-04-23 12:17:17 -0400263 * @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
Josef Bacik68c9d702008-10-03 17:32:43 -0400268 *
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
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100275 * 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.
Josef Bacik68c9d702008-10-03 17:32:43 -0400279 */
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100280
281int __generic_block_fiemap(struct inode *inode,
Josef Bacik3a3076f2010-04-23 12:17:17 -0400282 struct fiemap_extent_info *fieinfo, loff_t start,
283 loff_t len, get_block_t *get_block)
Josef Bacik68c9d702008-10-03 17:32:43 -0400284{
Josef Bacik3a3076f2010-04-23 12:17:17 -0400285 struct buffer_head map_bh;
286 sector_t start_blk, last_blk;
287 loff_t isize = i_size_read(inode);
Josef Bacik68c9d702008-10-03 17:32:43 -0400288 u64 logical = 0, phys = 0, size = 0;
289 u32 flags = FIEMAP_EXTENT_MERGED;
Josef Bacik3a3076f2010-04-23 12:17:17 -0400290 bool past_eof = false, whole_file = false;
291 int ret = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400292
Josef Bacik3a3076f2010-04-23 12:17:17 -0400293 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
294 if (ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400295 return ret;
296
Josef Bacik3a3076f2010-04-23 12:17:17 -0400297 /*
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
Josef Bacikd54cdc82011-02-01 15:52:47 -0800307 /*
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
Josef Bacik68c9d702008-10-03 17:32:43 -0400314 start_blk = logical_to_blk(inode, start);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400315 last_blk = logical_to_blk(inode, start + len - 1);
Josef Bacik68c9d702008-10-03 17:32:43 -0400316
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 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400322 memset(&map_bh, 0, sizeof(struct buffer_head));
323 map_bh.b_size = len;
Josef Bacik68c9d702008-10-03 17:32:43 -0400324
Josef Bacik3a3076f2010-04-23 12:17:17 -0400325 ret = get_block(inode, start_blk, &map_bh, 0);
Josef Bacik68c9d702008-10-03 17:32:43 -0400326 if (ret)
327 break;
328
329 /* HOLE */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400330 if (!buffer_mapped(&map_bh)) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700331 start_blk++;
332
333 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400334 * We want to handle the case where there is an
Josef Bacikdf3935f2009-05-06 16:02:53 -0700335 * 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 &&
Josef Bacik3a3076f2010-04-23 12:17:17 -0400341 blk_to_logical(inode, start_blk) >= isize)
Josef Bacikdf3935f2009-05-06 16:02:53 -0700342 past_eof = 1;
343
Josef Bacik68c9d702008-10-03 17:32:43 -0400344 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400345 * First hole after going past the EOF, this is our
Josef Bacik68c9d702008-10-03 17:32:43 -0400346 * last extent
347 */
Josef Bacikdf3935f2009-05-06 16:02:53 -0700348 if (past_eof && size) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400349 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
350 ret = fiemap_fill_next_extent(fieinfo, logical,
351 phys, size,
352 flags);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400353 } else if (size) {
354 ret = fiemap_fill_next_extent(fieinfo, logical,
355 phys, size, flags);
356 size = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400357 }
358
Josef Bacik68c9d702008-10-03 17:32:43 -0400359 /* if we have holes up to/past EOF then we're done */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400360 if (start_blk > last_blk || past_eof || ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400361 break;
Josef Bacik68c9d702008-10-03 17:32:43 -0400362 } else {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700363 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400364 * We have gone over the length of what we wanted to
Josef Bacikdf3935f2009-05-06 16:02:53 -0700365 * 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 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400378 if (start_blk > last_blk && !whole_file) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700379 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) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400390 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);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400398 phys = blk_to_logical(inode, map_bh.b_blocknr);
399 size = map_bh.b_size;
Josef Bacik68c9d702008-10-03 17:32:43 -0400400 flags = FIEMAP_EXTENT_MERGED;
401
Josef Bacik68c9d702008-10-03 17:32:43 -0400402 start_blk += logical_to_blk(inode, size);
403
404 /*
Josef Bacikdf3935f2009-05-06 16:02:53 -0700405 * 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
Josef Bacik68c9d702008-10-03 17:32:43 -0400408 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400409 if (!past_eof && logical + size >= isize)
410 past_eof = true;
Josef Bacik68c9d702008-10-03 17:32:43 -0400411 }
412 cond_resched();
Dmitry Monakhov913e0272015-02-10 14:09:29 -0800413 if (fatal_signal_pending(current)) {
414 ret = -EINTR;
415 break;
416 }
417
Josef Bacik68c9d702008-10-03 17:32:43 -0400418 } while (1);
419
Josef Bacik3a3076f2010-04-23 12:17:17 -0400420 /* If ret is 1 then we just hit the end of the extent array */
Josef Bacik68c9d702008-10-03 17:32:43 -0400421 if (ret == 1)
422 ret = 0;
423
424 return ret;
425}
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100426EXPORT_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
440int 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;
Al Viro59551022016-01-22 15:40:57 -0500445 inode_lock(inode);
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100446 ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
Al Viro59551022016-01-22 15:40:57 -0500447 inode_unlock(inode);
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100448 return ret;
449}
Josef Bacik68c9d702008-10-03 17:32:43 -0400450EXPORT_SYMBOL(generic_block_fiemap);
451
Adrian Bunk06270d52008-10-12 07:15:19 +0300452#endif /* CONFIG_BLOCK */
453
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400454/*
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 */
461int ioctl_preallocate(struct file *filp, void __user *argp)
462{
Al Viro496ad9a2013-01-23 17:07:38 -0500463 struct inode *inode = file_inode(filp);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400464 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
Anna Schumaker72c72bd2014-11-07 14:44:25 -0500482 return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400483}
484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485static int file_ioctl(struct file *filp, unsigned int cmd,
486 unsigned long arg)
487{
Al Viro496ad9a2013-01-23 17:07:38 -0500488 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 int __user *p = (int __user *)arg;
490
491 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800492 case FIBMAP:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800493 return ioctl_fibmap(filp, p);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800494 case FIONREAD:
495 return put_user(i_size_read(inode) - filp->f_pos, p);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400496 case FS_IOC_RESVSP:
497 case FS_IOC_RESVSP64:
498 return ioctl_preallocate(filp, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 }
500
Erez Zadokdeb21db2008-02-07 00:13:25 -0800501 return vfs_ioctl(filp, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800504static 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
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700518 spin_lock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800519 if (on)
520 filp->f_flags |= flag;
521 else
522 filp->f_flags &= ~flag;
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700523 spin_unlock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800524 return error;
525}
526
527static 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) {
Al Viro72c2d532013-09-22 16:27:52 -0400540 if (filp->f_op->fasync)
Jonathan Corbet76398422009-02-01 14:26:59 -0700541 /* fasync() adjusts filp->f_flags */
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800542 error = filp->f_op->fasync(fd, filp, on);
Jonathan Corbet218d11a2008-12-05 16:12:48 -0700543 else
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800544 error = -ENOTTY;
545 }
Jonathan Corbet60aa4922009-02-01 14:52:56 -0700546 return error < 0 ? error : 0;
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800547}
548
Takashi Satofcccf502009-01-09 16:40:59 -0800549static int ioctl_fsfreeze(struct file *filp)
550{
Al Viro496ad9a2013-01-23 17:07:38 -0500551 struct super_block *sb = file_inode(filp)->i_sb;
Takashi Satofcccf502009-01-09 16:40:59 -0800552
Seth Forsheef3f1a182015-02-15 14:35:35 -0600553 if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
Takashi Satofcccf502009-01-09 16:40:59 -0800554 return -EPERM;
555
556 /* If filesystem doesn't support freeze feature, return. */
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -0600557 if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
Takashi Satofcccf502009-01-09 16:40:59 -0800558 return -EOPNOTSUPP;
559
Takashi Satofcccf502009-01-09 16:40:59 -0800560 /* Freeze */
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -0600561 if (sb->s_op->freeze_super)
562 return sb->s_op->freeze_super(sb);
Josef Bacik18e9e512010-03-23 10:34:56 -0400563 return freeze_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800564}
565
566static int ioctl_fsthaw(struct file *filp)
567{
Al Viro496ad9a2013-01-23 17:07:38 -0500568 struct super_block *sb = file_inode(filp)->i_sb;
Takashi Satofcccf502009-01-09 16:40:59 -0800569
Seth Forsheef3f1a182015-02-15 14:35:35 -0600570 if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
Takashi Satofcccf502009-01-09 16:40:59 -0800571 return -EPERM;
572
Takashi Satofcccf502009-01-09 16:40:59 -0800573 /* Thaw */
Benjamin Marzinski48b6bca2014-11-13 20:42:03 -0600574 if (sb->s_op->thaw_super)
575 return sb->s_op->thaw_super(sb);
Josef Bacik18e9e512010-03-23 10:34:56 -0400576 return thaw_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800577}
578
Darrick J. Wong5297e0f2016-09-14 20:20:00 -0700579static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
Darrick J. Wong54dbc152015-12-19 00:55:59 -0800580{
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]);
Darrick J. Wongb71dbf12016-09-14 20:20:44 -0700593 if (size > PAGE_SIZE) {
594 ret = -ENOMEM;
595 goto out;
596 }
Darrick J. Wong54dbc152015-12-19 00:55:59 -0800597
598 same = memdup_user(argp, size);
599 if (IS_ERR(same)) {
600 ret = PTR_ERR(same);
601 same = NULL;
602 goto out;
603 }
604
Scott Bauer10eec602016-07-27 19:11:29 -0600605 same->dest_count = count;
Darrick J. Wong54dbc152015-12-19 00:55:59 -0800606 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
614out:
615 kfree(same);
616 return ret;
617}
618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619/*
620 * When you add any new common ioctls to the switches above and below
621 * please update compat_sys_ioctl() too.
622 *
Erez Zadokdeb21db2008-02-07 00:13:25 -0800623 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
625 */
Erez Zadokdeb21db2008-02-07 00:13:25 -0800626int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
627 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800629 int error = 0;
630 int __user *argp = (int __user *)arg;
Al Viro496ad9a2013-01-23 17:07:38 -0500631 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
633 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800634 case FIOCLEX:
635 set_close_on_exec(fd, 1);
636 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Erez Zadokc9845ff2008-02-07 00:13:23 -0800638 case FIONCLEX:
639 set_close_on_exec(fd, 0);
640 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Erez Zadokc9845ff2008-02-07 00:13:23 -0800642 case FIONBIO:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800643 error = ioctl_fionbio(filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800644 break;
645
646 case FIOASYNC:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800647 error = ioctl_fioasync(fd, filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800648 break;
649
650 case FIOQSIZE:
Namhyung Kim27a4f7e62011-01-17 00:48:17 +0900651 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;
Erez Zadokc9845ff2008-02-07 00:13:23 -0800656 } else
657 error = -ENOTTY;
658 break;
Takashi Satofcccf502009-01-09 16:40:59 -0800659
660 case FIFREEZE:
661 error = ioctl_fsfreeze(filp);
662 break;
663
664 case FITHAW:
665 error = ioctl_fsthaw(filp);
666 break;
667
Aneesh Kumar K.V19ba0552009-05-13 18:12:05 -0400668 case FS_IOC_FIEMAP:
669 return ioctl_fiemap(filp, arg);
670
671 case FIGETBSZ:
Namhyung Kim27a4f7e62011-01-17 00:48:17 +0900672 return put_user(inode->i_sb->s_blocksize, argp);
Aneesh Kumar K.V19ba0552009-05-13 18:12:05 -0400673
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100674 case FICLONE:
675 return ioctl_file_clone(filp, arg, 0, 0, 0);
676
677 case FICLONERANGE:
678 return ioctl_file_clone_range(filp, argp);
679
Darrick J. Wong54dbc152015-12-19 00:55:59 -0800680 case FIDEDUPERANGE:
681 return ioctl_file_dedupe_range(filp, argp);
682
Erez Zadokc9845ff2008-02-07 00:13:23 -0800683 default:
Namhyung Kim27a4f7e62011-01-17 00:48:17 +0900684 if (S_ISREG(inode->i_mode))
Erez Zadokc9845ff2008-02-07 00:13:23 -0800685 error = file_ioctl(filp, cmd, arg);
686 else
Erez Zadokdeb21db2008-02-07 00:13:25 -0800687 error = vfs_ioctl(filp, cmd, arg);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800688 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 }
690 return error;
691}
692
Dominik Brodowskicbb60b92018-03-13 21:43:59 +0100693int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Al Viro2903ff02012-08-28 12:52:22 -0400695 int error;
696 struct fd f = fdget(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
Al Viro2903ff02012-08-28 12:52:22 -0400698 if (!f.file)
699 return -EBADF;
700 error = security_file_ioctl(f.file, cmd, arg);
701 if (!error)
702 error = do_vfs_ioctl(f.file, fd, cmd, arg);
703 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 return error;
705}
Dominik Brodowskicbb60b92018-03-13 21:43:59 +0100706
707SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
708{
709 return ksys_ioctl(fd, cmd, arg);
710}