blob: 1eebeb72b20276191fcad6199d8bf0b79a4d9921 [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>
13#include <linux/module.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
Arnd Bergmannb19dd422010-07-04 00:15:10 +020040 if (!filp->f_op || !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)
45 error = -EINVAL;
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, };
178 struct inode *inode = filp->f_path.dentry->d_inode;
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
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
Adrian Bunk06270d52008-10-12 07:15:19 +0300218#ifdef CONFIG_BLOCK
219
Josef Bacik3a3076f2010-04-23 12:17:17 -0400220static 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}
Josef Bacik68c9d702008-10-03 17:32:43 -0400229
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100230/**
231 * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
Josef Bacik3a3076f2010-04-23 12:17:17 -0400232 * @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
Josef Bacik68c9d702008-10-03 17:32:43 -0400237 *
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
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100244 * 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.
Josef Bacik68c9d702008-10-03 17:32:43 -0400248 */
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100249
250int __generic_block_fiemap(struct inode *inode,
Josef Bacik3a3076f2010-04-23 12:17:17 -0400251 struct fiemap_extent_info *fieinfo, loff_t start,
252 loff_t len, get_block_t *get_block)
Josef Bacik68c9d702008-10-03 17:32:43 -0400253{
Josef Bacik3a3076f2010-04-23 12:17:17 -0400254 struct buffer_head map_bh;
255 sector_t start_blk, last_blk;
256 loff_t isize = i_size_read(inode);
Josef Bacik68c9d702008-10-03 17:32:43 -0400257 u64 logical = 0, phys = 0, size = 0;
258 u32 flags = FIEMAP_EXTENT_MERGED;
Josef Bacik3a3076f2010-04-23 12:17:17 -0400259 bool past_eof = false, whole_file = false;
260 int ret = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400261
Josef Bacik3a3076f2010-04-23 12:17:17 -0400262 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
263 if (ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400264 return ret;
265
Josef Bacik3a3076f2010-04-23 12:17:17 -0400266 /*
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 }
275
Josef Bacikd54cdc82011-02-01 15:52:47 -0800276 /*
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
Josef Bacik68c9d702008-10-03 17:32:43 -0400283 start_blk = logical_to_blk(inode, start);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400284 last_blk = logical_to_blk(inode, start + len - 1);
Josef Bacik68c9d702008-10-03 17:32:43 -0400285
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 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400291 memset(&map_bh, 0, sizeof(struct buffer_head));
292 map_bh.b_size = len;
Josef Bacik68c9d702008-10-03 17:32:43 -0400293
Josef Bacik3a3076f2010-04-23 12:17:17 -0400294 ret = get_block(inode, start_blk, &map_bh, 0);
Josef Bacik68c9d702008-10-03 17:32:43 -0400295 if (ret)
296 break;
297
298 /* HOLE */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400299 if (!buffer_mapped(&map_bh)) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700300 start_blk++;
301
302 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400303 * We want to handle the case where there is an
Josef Bacikdf3935f2009-05-06 16:02:53 -0700304 * 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 &&
Josef Bacik3a3076f2010-04-23 12:17:17 -0400310 blk_to_logical(inode, start_blk) >= isize)
Josef Bacikdf3935f2009-05-06 16:02:53 -0700311 past_eof = 1;
312
Josef Bacik68c9d702008-10-03 17:32:43 -0400313 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400314 * First hole after going past the EOF, this is our
Josef Bacik68c9d702008-10-03 17:32:43 -0400315 * last extent
316 */
Josef Bacikdf3935f2009-05-06 16:02:53 -0700317 if (past_eof && size) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400318 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
319 ret = fiemap_fill_next_extent(fieinfo, logical,
320 phys, size,
321 flags);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400322 } else if (size) {
323 ret = fiemap_fill_next_extent(fieinfo, logical,
324 phys, size, flags);
325 size = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400326 }
327
Josef Bacik68c9d702008-10-03 17:32:43 -0400328 /* if we have holes up to/past EOF then we're done */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400329 if (start_blk > last_blk || past_eof || ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400330 break;
Josef Bacik68c9d702008-10-03 17:32:43 -0400331 } else {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700332 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400333 * We have gone over the length of what we wanted to
Josef Bacikdf3935f2009-05-06 16:02:53 -0700334 * 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 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400347 if (start_blk > last_blk && !whole_file) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700348 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) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400359 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);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400367 phys = blk_to_logical(inode, map_bh.b_blocknr);
368 size = map_bh.b_size;
Josef Bacik68c9d702008-10-03 17:32:43 -0400369 flags = FIEMAP_EXTENT_MERGED;
370
Josef Bacik68c9d702008-10-03 17:32:43 -0400371 start_blk += logical_to_blk(inode, size);
372
373 /*
Josef Bacikdf3935f2009-05-06 16:02:53 -0700374 * 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
Josef Bacik68c9d702008-10-03 17:32:43 -0400377 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400378 if (!past_eof && logical + size >= isize)
379 past_eof = true;
Josef Bacik68c9d702008-10-03 17:32:43 -0400380 }
381 cond_resched();
382 } while (1);
383
Josef Bacik3a3076f2010-04-23 12:17:17 -0400384 /* If ret is 1 then we just hit the end of the extent array */
Josef Bacik68c9d702008-10-03 17:32:43 -0400385 if (ret == 1)
386 ret = 0;
387
388 return ret;
389}
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100390EXPORT_SYMBOL(__generic_block_fiemap);
391
392/**
393 * generic_block_fiemap - FIEMAP for block based inodes
394 * @inode: The inode to map
395 * @fieinfo: The mapping information
396 * @start: The initial block to map
397 * @len: The length of the extect to attempt to map
398 * @get_block: The block mapping function for the fs
399 *
400 * Calls __generic_block_fiemap to map the inode, after taking
401 * the inode's mutex lock.
402 */
403
404int generic_block_fiemap(struct inode *inode,
405 struct fiemap_extent_info *fieinfo, u64 start,
406 u64 len, get_block_t *get_block)
407{
408 int ret;
409 mutex_lock(&inode->i_mutex);
410 ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
411 mutex_unlock(&inode->i_mutex);
412 return ret;
413}
Josef Bacik68c9d702008-10-03 17:32:43 -0400414EXPORT_SYMBOL(generic_block_fiemap);
415
Adrian Bunk06270d52008-10-12 07:15:19 +0300416#endif /* CONFIG_BLOCK */
417
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400418/*
419 * This provides compatibility with legacy XFS pre-allocation ioctls
420 * which predate the fallocate syscall.
421 *
422 * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
423 * are used here, rest are ignored.
424 */
425int ioctl_preallocate(struct file *filp, void __user *argp)
426{
427 struct inode *inode = filp->f_path.dentry->d_inode;
428 struct space_resv sr;
429
430 if (copy_from_user(&sr, argp, sizeof(sr)))
431 return -EFAULT;
432
433 switch (sr.l_whence) {
434 case SEEK_SET:
435 break;
436 case SEEK_CUR:
437 sr.l_start += filp->f_pos;
438 break;
439 case SEEK_END:
440 sr.l_start += i_size_read(inode);
441 break;
442 default:
443 return -EINVAL;
444 }
445
446 return do_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
447}
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449static int file_ioctl(struct file *filp, unsigned int cmd,
450 unsigned long arg)
451{
Erez Zadokc9845ff2008-02-07 00:13:23 -0800452 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 int __user *p = (int __user *)arg;
454
455 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800456 case FIBMAP:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800457 return ioctl_fibmap(filp, p);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800458 case FIONREAD:
459 return put_user(i_size_read(inode) - filp->f_pos, p);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400460 case FS_IOC_RESVSP:
461 case FS_IOC_RESVSP64:
462 return ioctl_preallocate(filp, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 }
464
Erez Zadokdeb21db2008-02-07 00:13:25 -0800465 return vfs_ioctl(filp, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800468static int ioctl_fionbio(struct file *filp, int __user *argp)
469{
470 unsigned int flag;
471 int on, error;
472
473 error = get_user(on, argp);
474 if (error)
475 return error;
476 flag = O_NONBLOCK;
477#ifdef __sparc__
478 /* SunOS compatibility item. */
479 if (O_NONBLOCK != O_NDELAY)
480 flag |= O_NDELAY;
481#endif
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700482 spin_lock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800483 if (on)
484 filp->f_flags |= flag;
485 else
486 filp->f_flags &= ~flag;
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700487 spin_unlock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800488 return error;
489}
490
491static int ioctl_fioasync(unsigned int fd, struct file *filp,
492 int __user *argp)
493{
494 unsigned int flag;
495 int on, error;
496
497 error = get_user(on, argp);
498 if (error)
499 return error;
500 flag = on ? FASYNC : 0;
501
502 /* Did FASYNC state change ? */
503 if ((flag ^ filp->f_flags) & FASYNC) {
Jonathan Corbet218d11a2008-12-05 16:12:48 -0700504 if (filp->f_op && filp->f_op->fasync)
Jonathan Corbet76398422009-02-01 14:26:59 -0700505 /* fasync() adjusts filp->f_flags */
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800506 error = filp->f_op->fasync(fd, filp, on);
Jonathan Corbet218d11a2008-12-05 16:12:48 -0700507 else
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800508 error = -ENOTTY;
509 }
Jonathan Corbet60aa4922009-02-01 14:52:56 -0700510 return error < 0 ? error : 0;
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800511}
512
Takashi Satofcccf502009-01-09 16:40:59 -0800513static int ioctl_fsfreeze(struct file *filp)
514{
515 struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
516
517 if (!capable(CAP_SYS_ADMIN))
518 return -EPERM;
519
520 /* If filesystem doesn't support freeze feature, return. */
521 if (sb->s_op->freeze_fs == NULL)
522 return -EOPNOTSUPP;
523
Takashi Satofcccf502009-01-09 16:40:59 -0800524 /* Freeze */
Josef Bacik18e9e512010-03-23 10:34:56 -0400525 return freeze_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800526}
527
528static int ioctl_fsthaw(struct file *filp)
529{
530 struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
531
532 if (!capable(CAP_SYS_ADMIN))
533 return -EPERM;
534
Takashi Satofcccf502009-01-09 16:40:59 -0800535 /* Thaw */
Josef Bacik18e9e512010-03-23 10:34:56 -0400536 return thaw_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800537}
538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539/*
540 * When you add any new common ioctls to the switches above and below
541 * please update compat_sys_ioctl() too.
542 *
Erez Zadokdeb21db2008-02-07 00:13:25 -0800543 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
545 */
Erez Zadokdeb21db2008-02-07 00:13:25 -0800546int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
547 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548{
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800549 int error = 0;
550 int __user *argp = (int __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800553 case FIOCLEX:
554 set_close_on_exec(fd, 1);
555 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Erez Zadokc9845ff2008-02-07 00:13:23 -0800557 case FIONCLEX:
558 set_close_on_exec(fd, 0);
559 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Erez Zadokc9845ff2008-02-07 00:13:23 -0800561 case FIONBIO:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800562 error = ioctl_fionbio(filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800563 break;
564
565 case FIOASYNC:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800566 error = ioctl_fioasync(fd, filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800567 break;
568
569 case FIOQSIZE:
570 if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
571 S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
572 S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
573 loff_t res =
574 inode_get_bytes(filp->f_path.dentry->d_inode);
575 error = copy_to_user((loff_t __user *)arg, &res,
576 sizeof(res)) ? -EFAULT : 0;
577 } else
578 error = -ENOTTY;
579 break;
Takashi Satofcccf502009-01-09 16:40:59 -0800580
581 case FIFREEZE:
582 error = ioctl_fsfreeze(filp);
583 break;
584
585 case FITHAW:
586 error = ioctl_fsthaw(filp);
587 break;
588
Aneesh Kumar K.V19ba0552009-05-13 18:12:05 -0400589 case FS_IOC_FIEMAP:
590 return ioctl_fiemap(filp, arg);
591
592 case FIGETBSZ:
593 {
594 struct inode *inode = filp->f_path.dentry->d_inode;
595 int __user *p = (int __user *)arg;
596 return put_user(inode->i_sb->s_blocksize, p);
597 }
598
Erez Zadokc9845ff2008-02-07 00:13:23 -0800599 default:
600 if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
601 error = file_ioctl(filp, cmd, arg);
602 else
Erez Zadokdeb21db2008-02-07 00:13:25 -0800603 error = vfs_ioctl(filp, cmd, arg);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800604 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 }
606 return error;
607}
608
Heiko Carstensa26eab22009-01-14 14:14:17 +0100609SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610{
Erez Zadokc9845ff2008-02-07 00:13:23 -0800611 struct file *filp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 int error = -EBADF;
613 int fput_needed;
614
615 filp = fget_light(fd, &fput_needed);
616 if (!filp)
617 goto out;
618
619 error = security_file_ioctl(filp, cmd, arg);
620 if (error)
621 goto out_fput;
622
Erez Zadokdeb21db2008-02-07 00:13:25 -0800623 error = do_vfs_ioctl(filp, fd, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 out_fput:
625 fput_light(filp, fput_needed);
626 out:
627 return error;
628}