blob: e92fdbb3bc3aebd5b52221d2b0e5ec4094a37fe9 [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>
9#include <linux/smp_lock.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>
14#include <linux/module.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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <asm/ioctls.h>
21
Mark Fashehc4b929b2008-10-08 19:44:18 -040022/* So that the fiemap access checks can't overflow on 32 bit machines. */
23#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
24
Erez Zadokdeb21db2008-02-07 00:13:25 -080025/**
26 * vfs_ioctl - call filesystem specific ioctl methods
Christoph Hellwigf6a4c8b2008-02-09 00:10:16 -080027 * @filp: open file to invoke ioctl method on
28 * @cmd: ioctl command to execute
29 * @arg: command-specific argument for ioctl
Erez Zadokdeb21db2008-02-07 00:13:25 -080030 *
31 * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
Erez Zadokdeb21db2008-02-07 00:13:25 -080032 * returns -ENOTTY.
33 *
34 * Returns 0 on success, -errno on error.
35 */
Adrian Bunk67cde592008-04-29 00:58:55 -070036static long vfs_ioctl(struct file *filp, unsigned int cmd,
37 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
39 int error = -ENOTTY;
40
Arnd Bergmannb19dd422010-07-04 00:15:10 +020041 if (!filp->f_op || !filp->f_op->unlocked_ioctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 goto out;
43
Arnd Bergmannb19dd422010-07-04 00:15:10 +020044 error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
45 if (error == -ENOIOCTLCMD)
46 error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 out:
48 return error;
49}
50
Erez Zadokaa81a7c2008-02-07 00:13:25 -080051static int ioctl_fibmap(struct file *filp, int __user *p)
52{
53 struct address_space *mapping = filp->f_mapping;
54 int res, block;
55
56 /* do we support this mess? */
57 if (!mapping->a_ops->bmap)
58 return -EINVAL;
59 if (!capable(CAP_SYS_RAWIO))
60 return -EPERM;
61 res = get_user(block, p);
62 if (res)
63 return res;
Erez Zadokaa81a7c2008-02-07 00:13:25 -080064 res = mapping->a_ops->bmap(mapping, block);
Erez Zadokaa81a7c2008-02-07 00:13:25 -080065 return put_user(res, p);
66}
67
Mark Fashehc4b929b2008-10-08 19:44:18 -040068/**
69 * fiemap_fill_next_extent - Fiemap helper function
70 * @fieinfo: Fiemap context passed into ->fiemap
71 * @logical: Extent logical start offset, in bytes
72 * @phys: Extent physical start offset, in bytes
73 * @len: Extent length, in bytes
74 * @flags: FIEMAP_EXTENT flags that describe this extent
75 *
76 * Called from file system ->fiemap callback. Will populate extent
77 * info as passed in via arguments and copy to user memory. On
78 * success, extent count on fieinfo is incremented.
79 *
80 * Returns 0 on success, -errno on error, 1 if this was the last
81 * extent that will fit in user array.
82 */
83#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
84#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
85#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
86int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
87 u64 phys, u64 len, u32 flags)
88{
89 struct fiemap_extent extent;
90 struct fiemap_extent *dest = fieinfo->fi_extents_start;
91
92 /* only count the extents */
93 if (fieinfo->fi_extents_max == 0) {
94 fieinfo->fi_extents_mapped++;
95 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
96 }
97
98 if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
99 return 1;
100
101 if (flags & SET_UNKNOWN_FLAGS)
102 flags |= FIEMAP_EXTENT_UNKNOWN;
103 if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
104 flags |= FIEMAP_EXTENT_ENCODED;
105 if (flags & SET_NOT_ALIGNED_FLAGS)
106 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
107
108 memset(&extent, 0, sizeof(extent));
109 extent.fe_logical = logical;
110 extent.fe_physical = phys;
111 extent.fe_length = len;
112 extent.fe_flags = flags;
113
114 dest += fieinfo->fi_extents_mapped;
115 if (copy_to_user(dest, &extent, sizeof(extent)))
116 return -EFAULT;
117
118 fieinfo->fi_extents_mapped++;
119 if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
120 return 1;
121 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
122}
123EXPORT_SYMBOL(fiemap_fill_next_extent);
124
125/**
126 * fiemap_check_flags - check validity of requested flags for fiemap
127 * @fieinfo: Fiemap context passed into ->fiemap
128 * @fs_flags: Set of fiemap flags that the file system understands
129 *
130 * Called from file system ->fiemap callback. This will compute the
131 * intersection of valid fiemap flags and those that the fs supports. That
132 * value is then compared against the user supplied flags. In case of bad user
133 * flags, the invalid values will be written into the fieinfo structure, and
134 * -EBADR is returned, which tells ioctl_fiemap() to return those values to
135 * userspace. For this reason, a return code of -EBADR should be preserved.
136 *
137 * Returns 0 on success, -EBADR on bad flags.
138 */
139int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
140{
141 u32 incompat_flags;
142
143 incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
144 if (incompat_flags) {
145 fieinfo->fi_flags = incompat_flags;
146 return -EBADR;
147 }
148 return 0;
149}
150EXPORT_SYMBOL(fiemap_check_flags);
151
152static int fiemap_check_ranges(struct super_block *sb,
153 u64 start, u64 len, u64 *new_len)
154{
Jeff Layton5aa98b72009-09-18 13:05:50 -0700155 u64 maxbytes = (u64) sb->s_maxbytes;
156
Mark Fashehc4b929b2008-10-08 19:44:18 -0400157 *new_len = len;
158
159 if (len == 0)
160 return -EINVAL;
161
Jeff Layton5aa98b72009-09-18 13:05:50 -0700162 if (start > maxbytes)
Mark Fashehc4b929b2008-10-08 19:44:18 -0400163 return -EFBIG;
164
165 /*
166 * Shrink request scope to what the fs can actually handle.
167 */
Jeff Layton5aa98b72009-09-18 13:05:50 -0700168 if (len > maxbytes || (maxbytes - len) < start)
169 *new_len = maxbytes - start;
Mark Fashehc4b929b2008-10-08 19:44:18 -0400170
171 return 0;
172}
173
174static int ioctl_fiemap(struct file *filp, unsigned long arg)
175{
176 struct fiemap fiemap;
177 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
186 if (copy_from_user(&fiemap, (struct fiemap __user *)arg,
187 sizeof(struct fiemap)))
188 return -EFAULT;
189
190 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
191 return -EINVAL;
192
193 error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
194 &len);
195 if (error)
196 return error;
197
198 fieinfo.fi_flags = fiemap.fm_flags;
199 fieinfo.fi_extents_max = fiemap.fm_extent_count;
200 fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap));
201
202 if (fiemap.fm_extent_count != 0 &&
203 !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
204 fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
205 return -EFAULT;
206
207 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
208 filemap_write_and_wait(inode->i_mapping);
209
210 error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
211 fiemap.fm_flags = fieinfo.fi_flags;
212 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
213 if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap)))
214 error = -EFAULT;
215
216 return error;
217}
218
Adrian Bunk06270d52008-10-12 07:15:19 +0300219#ifdef CONFIG_BLOCK
220
Josef Bacik3a3076f2010-04-23 12:17:17 -0400221static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
222{
223 return (offset >> inode->i_blkbits);
224}
225
226static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
227{
228 return (blk << inode->i_blkbits);
229}
Josef Bacik68c9d702008-10-03 17:32:43 -0400230
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100231/**
232 * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
Josef Bacik3a3076f2010-04-23 12:17:17 -0400233 * @inode: the inode to map
234 * @fieinfo: the fiemap info struct that will be passed back to userspace
235 * @start: where to start mapping in the inode
236 * @len: how much space to map
237 * @get_block: the fs's get_block function
Josef Bacik68c9d702008-10-03 17:32:43 -0400238 *
239 * This does FIEMAP for block based inodes. Basically it will just loop
240 * through get_block until we hit the number of extents we want to map, or we
241 * go past the end of the file and hit a hole.
242 *
243 * If it is possible to have data blocks beyond a hole past @inode->i_size, then
244 * please do not use this function, it will stop at the first unmapped block
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100245 * beyond i_size.
246 *
247 * If you use this function directly, you need to do your own locking. Use
248 * generic_block_fiemap if you want the locking done for you.
Josef Bacik68c9d702008-10-03 17:32:43 -0400249 */
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100250
251int __generic_block_fiemap(struct inode *inode,
Josef Bacik3a3076f2010-04-23 12:17:17 -0400252 struct fiemap_extent_info *fieinfo, loff_t start,
253 loff_t len, get_block_t *get_block)
Josef Bacik68c9d702008-10-03 17:32:43 -0400254{
Josef Bacik3a3076f2010-04-23 12:17:17 -0400255 struct buffer_head map_bh;
256 sector_t start_blk, last_blk;
257 loff_t isize = i_size_read(inode);
Josef Bacik68c9d702008-10-03 17:32:43 -0400258 u64 logical = 0, phys = 0, size = 0;
259 u32 flags = FIEMAP_EXTENT_MERGED;
Josef Bacik3a3076f2010-04-23 12:17:17 -0400260 bool past_eof = false, whole_file = false;
261 int ret = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400262
Josef Bacik3a3076f2010-04-23 12:17:17 -0400263 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
264 if (ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400265 return ret;
266
Josef Bacik3a3076f2010-04-23 12:17:17 -0400267 /*
268 * Either the i_mutex or other appropriate locking needs to be held
269 * since we expect isize to not change at all through the duration of
270 * this call.
271 */
272 if (len >= isize) {
273 whole_file = true;
274 len = isize;
275 }
276
Josef Bacik68c9d702008-10-03 17:32:43 -0400277 start_blk = logical_to_blk(inode, start);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400278 last_blk = logical_to_blk(inode, start + len - 1);
Josef Bacik68c9d702008-10-03 17:32:43 -0400279
280 do {
281 /*
282 * we set b_size to the total size we want so it will map as
283 * many contiguous blocks as possible at once
284 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400285 memset(&map_bh, 0, sizeof(struct buffer_head));
286 map_bh.b_size = len;
Josef Bacik68c9d702008-10-03 17:32:43 -0400287
Josef Bacik3a3076f2010-04-23 12:17:17 -0400288 ret = get_block(inode, start_blk, &map_bh, 0);
Josef Bacik68c9d702008-10-03 17:32:43 -0400289 if (ret)
290 break;
291
292 /* HOLE */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400293 if (!buffer_mapped(&map_bh)) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700294 start_blk++;
295
296 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400297 * We want to handle the case where there is an
Josef Bacikdf3935f2009-05-06 16:02:53 -0700298 * allocated block at the front of the file, and then
299 * nothing but holes up to the end of the file properly,
300 * to make sure that extent at the front gets properly
301 * marked with FIEMAP_EXTENT_LAST
302 */
303 if (!past_eof &&
Josef Bacik3a3076f2010-04-23 12:17:17 -0400304 blk_to_logical(inode, start_blk) >= isize)
Josef Bacikdf3935f2009-05-06 16:02:53 -0700305 past_eof = 1;
306
Josef Bacik68c9d702008-10-03 17:32:43 -0400307 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400308 * First hole after going past the EOF, this is our
Josef Bacik68c9d702008-10-03 17:32:43 -0400309 * last extent
310 */
Josef Bacikdf3935f2009-05-06 16:02:53 -0700311 if (past_eof && size) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400312 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
313 ret = fiemap_fill_next_extent(fieinfo, logical,
314 phys, size,
315 flags);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400316 } else if (size) {
317 ret = fiemap_fill_next_extent(fieinfo, logical,
318 phys, size, flags);
319 size = 0;
Josef Bacik68c9d702008-10-03 17:32:43 -0400320 }
321
Josef Bacik68c9d702008-10-03 17:32:43 -0400322 /* if we have holes up to/past EOF then we're done */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400323 if (start_blk > last_blk || past_eof || ret)
Josef Bacik68c9d702008-10-03 17:32:43 -0400324 break;
Josef Bacik68c9d702008-10-03 17:32:43 -0400325 } else {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700326 /*
Josef Bacik3a3076f2010-04-23 12:17:17 -0400327 * We have gone over the length of what we wanted to
Josef Bacikdf3935f2009-05-06 16:02:53 -0700328 * map, and it wasn't the entire file, so add the extent
329 * we got last time and exit.
330 *
331 * This is for the case where say we want to map all the
332 * way up to the second to the last block in a file, but
333 * the last block is a hole, making the second to last
334 * block FIEMAP_EXTENT_LAST. In this case we want to
335 * see if there is a hole after the second to last block
336 * so we can mark it properly. If we found data after
337 * we exceeded the length we were requesting, then we
338 * are good to go, just add the extent to the fieinfo
339 * and break
340 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400341 if (start_blk > last_blk && !whole_file) {
Josef Bacikdf3935f2009-05-06 16:02:53 -0700342 ret = fiemap_fill_next_extent(fieinfo, logical,
343 phys, size,
344 flags);
345 break;
346 }
347
348 /*
349 * if size != 0 then we know we already have an extent
350 * to add, so add it.
351 */
352 if (size) {
Josef Bacik68c9d702008-10-03 17:32:43 -0400353 ret = fiemap_fill_next_extent(fieinfo, logical,
354 phys, size,
355 flags);
356 if (ret)
357 break;
358 }
359
360 logical = blk_to_logical(inode, start_blk);
Josef Bacik3a3076f2010-04-23 12:17:17 -0400361 phys = blk_to_logical(inode, map_bh.b_blocknr);
362 size = map_bh.b_size;
Josef Bacik68c9d702008-10-03 17:32:43 -0400363 flags = FIEMAP_EXTENT_MERGED;
364
Josef Bacik68c9d702008-10-03 17:32:43 -0400365 start_blk += logical_to_blk(inode, size);
366
367 /*
Josef Bacikdf3935f2009-05-06 16:02:53 -0700368 * If we are past the EOF, then we need to make sure as
369 * soon as we find a hole that the last extent we found
370 * is marked with FIEMAP_EXTENT_LAST
Josef Bacik68c9d702008-10-03 17:32:43 -0400371 */
Josef Bacik3a3076f2010-04-23 12:17:17 -0400372 if (!past_eof && logical + size >= isize)
373 past_eof = true;
Josef Bacik68c9d702008-10-03 17:32:43 -0400374 }
375 cond_resched();
376 } while (1);
377
Josef Bacik3a3076f2010-04-23 12:17:17 -0400378 /* If ret is 1 then we just hit the end of the extent array */
Josef Bacik68c9d702008-10-03 17:32:43 -0400379 if (ret == 1)
380 ret = 0;
381
382 return ret;
383}
Steven Whitehousee9079cc2008-10-14 14:43:29 +0100384EXPORT_SYMBOL(__generic_block_fiemap);
385
386/**
387 * generic_block_fiemap - FIEMAP for block based inodes
388 * @inode: The inode to map
389 * @fieinfo: The mapping information
390 * @start: The initial block to map
391 * @len: The length of the extect to attempt to map
392 * @get_block: The block mapping function for the fs
393 *
394 * Calls __generic_block_fiemap to map the inode, after taking
395 * the inode's mutex lock.
396 */
397
398int generic_block_fiemap(struct inode *inode,
399 struct fiemap_extent_info *fieinfo, u64 start,
400 u64 len, get_block_t *get_block)
401{
402 int ret;
403 mutex_lock(&inode->i_mutex);
404 ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
405 mutex_unlock(&inode->i_mutex);
406 return ret;
407}
Josef Bacik68c9d702008-10-03 17:32:43 -0400408EXPORT_SYMBOL(generic_block_fiemap);
409
Adrian Bunk06270d52008-10-12 07:15:19 +0300410#endif /* CONFIG_BLOCK */
411
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400412/*
413 * This provides compatibility with legacy XFS pre-allocation ioctls
414 * which predate the fallocate syscall.
415 *
416 * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
417 * are used here, rest are ignored.
418 */
419int ioctl_preallocate(struct file *filp, void __user *argp)
420{
421 struct inode *inode = filp->f_path.dentry->d_inode;
422 struct space_resv sr;
423
424 if (copy_from_user(&sr, argp, sizeof(sr)))
425 return -EFAULT;
426
427 switch (sr.l_whence) {
428 case SEEK_SET:
429 break;
430 case SEEK_CUR:
431 sr.l_start += filp->f_pos;
432 break;
433 case SEEK_END:
434 sr.l_start += i_size_read(inode);
435 break;
436 default:
437 return -EINVAL;
438 }
439
440 return do_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
441}
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443static int file_ioctl(struct file *filp, unsigned int cmd,
444 unsigned long arg)
445{
Erez Zadokc9845ff2008-02-07 00:13:23 -0800446 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 int __user *p = (int __user *)arg;
448
449 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800450 case FIBMAP:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800451 return ioctl_fibmap(filp, p);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800452 case FIONREAD:
453 return put_user(i_size_read(inode) - filp->f_pos, p);
Ankit Jain3e63cbb2009-06-19 14:28:07 -0400454 case FS_IOC_RESVSP:
455 case FS_IOC_RESVSP64:
456 return ioctl_preallocate(filp, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 }
458
Erez Zadokdeb21db2008-02-07 00:13:25 -0800459 return vfs_ioctl(filp, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460}
461
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800462static int ioctl_fionbio(struct file *filp, int __user *argp)
463{
464 unsigned int flag;
465 int on, error;
466
467 error = get_user(on, argp);
468 if (error)
469 return error;
470 flag = O_NONBLOCK;
471#ifdef __sparc__
472 /* SunOS compatibility item. */
473 if (O_NONBLOCK != O_NDELAY)
474 flag |= O_NDELAY;
475#endif
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700476 spin_lock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800477 if (on)
478 filp->f_flags |= flag;
479 else
480 filp->f_flags &= ~flag;
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -0700481 spin_unlock(&filp->f_lock);
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800482 return error;
483}
484
485static int ioctl_fioasync(unsigned int fd, struct file *filp,
486 int __user *argp)
487{
488 unsigned int flag;
489 int on, error;
490
491 error = get_user(on, argp);
492 if (error)
493 return error;
494 flag = on ? FASYNC : 0;
495
496 /* Did FASYNC state change ? */
497 if ((flag ^ filp->f_flags) & FASYNC) {
Jonathan Corbet218d11a2008-12-05 16:12:48 -0700498 if (filp->f_op && filp->f_op->fasync)
Jonathan Corbet76398422009-02-01 14:26:59 -0700499 /* fasync() adjusts filp->f_flags */
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800500 error = filp->f_op->fasync(fd, filp, on);
Jonathan Corbet218d11a2008-12-05 16:12:48 -0700501 else
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800502 error = -ENOTTY;
503 }
Jonathan Corbet60aa4922009-02-01 14:52:56 -0700504 return error < 0 ? error : 0;
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800505}
506
Takashi Satofcccf502009-01-09 16:40:59 -0800507static int ioctl_fsfreeze(struct file *filp)
508{
509 struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
510
511 if (!capable(CAP_SYS_ADMIN))
512 return -EPERM;
513
514 /* If filesystem doesn't support freeze feature, return. */
515 if (sb->s_op->freeze_fs == NULL)
516 return -EOPNOTSUPP;
517
Takashi Satofcccf502009-01-09 16:40:59 -0800518 /* Freeze */
Josef Bacik18e9e512010-03-23 10:34:56 -0400519 return freeze_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800520}
521
522static int ioctl_fsthaw(struct file *filp)
523{
524 struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
525
526 if (!capable(CAP_SYS_ADMIN))
527 return -EPERM;
528
Takashi Satofcccf502009-01-09 16:40:59 -0800529 /* Thaw */
Josef Bacik18e9e512010-03-23 10:34:56 -0400530 return thaw_super(sb);
Takashi Satofcccf502009-01-09 16:40:59 -0800531}
532
Lukas Czerner367a51a2010-10-27 21:30:11 -0400533static int ioctl_fstrim(struct file *filp, void __user *argp)
534{
535 struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
536 struct fstrim_range range;
537 int ret = 0;
538
539 if (!capable(CAP_SYS_ADMIN))
540 return -EPERM;
541
542 /* If filesystem doesn't support trim feature, return. */
543 if (sb->s_op->trim_fs == NULL)
544 return -EOPNOTSUPP;
545
546 /* If a blockdevice-backed filesystem isn't specified, return EINVAL. */
547 if (sb->s_bdev == NULL)
548 return -EINVAL;
549
550 if (argp == NULL) {
551 range.start = 0;
552 range.len = ULLONG_MAX;
553 range.minlen = 0;
554 } else if (copy_from_user(&range, argp, sizeof(range)))
555 return -EFAULT;
556
557 ret = sb->s_op->trim_fs(sb, &range);
558 if (ret < 0)
559 return ret;
560
561 if ((argp != NULL) &&
562 (copy_to_user(argp, &range, sizeof(range))))
563 return -EFAULT;
564
565 return 0;
566}
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568/*
569 * When you add any new common ioctls to the switches above and below
570 * please update compat_sys_ioctl() too.
571 *
Erez Zadokdeb21db2008-02-07 00:13:25 -0800572 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
574 */
Erez Zadokdeb21db2008-02-07 00:13:25 -0800575int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
576 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800578 int error = 0;
579 int __user *argp = (int __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 switch (cmd) {
Erez Zadokc9845ff2008-02-07 00:13:23 -0800582 case FIOCLEX:
583 set_close_on_exec(fd, 1);
584 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Erez Zadokc9845ff2008-02-07 00:13:23 -0800586 case FIONCLEX:
587 set_close_on_exec(fd, 0);
588 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Erez Zadokc9845ff2008-02-07 00:13:23 -0800590 case FIONBIO:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800591 error = ioctl_fionbio(filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800592 break;
593
594 case FIOASYNC:
Erez Zadokaa81a7c2008-02-07 00:13:25 -0800595 error = ioctl_fioasync(fd, filp, argp);
Erez Zadokc9845ff2008-02-07 00:13:23 -0800596 break;
597
598 case FIOQSIZE:
599 if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
600 S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
601 S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
602 loff_t res =
603 inode_get_bytes(filp->f_path.dentry->d_inode);
604 error = copy_to_user((loff_t __user *)arg, &res,
605 sizeof(res)) ? -EFAULT : 0;
606 } else
607 error = -ENOTTY;
608 break;
Takashi Satofcccf502009-01-09 16:40:59 -0800609
610 case FIFREEZE:
611 error = ioctl_fsfreeze(filp);
612 break;
613
614 case FITHAW:
615 error = ioctl_fsthaw(filp);
616 break;
617
Lukas Czerner367a51a2010-10-27 21:30:11 -0400618 case FITRIM:
619 error = ioctl_fstrim(filp, argp);
620 break;
621
Aneesh Kumar K.V19ba0552009-05-13 18:12:05 -0400622 case FS_IOC_FIEMAP:
623 return ioctl_fiemap(filp, arg);
624
625 case FIGETBSZ:
626 {
627 struct inode *inode = filp->f_path.dentry->d_inode;
628 int __user *p = (int __user *)arg;
629 return put_user(inode->i_sb->s_blocksize, p);
630 }
631
Erez Zadokc9845ff2008-02-07 00:13:23 -0800632 default:
633 if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
634 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{
Erez Zadokc9845ff2008-02-07 00:13:23 -0800644 struct file *filp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 int error = -EBADF;
646 int fput_needed;
647
648 filp = fget_light(fd, &fput_needed);
649 if (!filp)
650 goto out;
651
652 error = security_file_ioctl(filp, cmd, arg);
653 if (error)
654 goto out_fput;
655
Erez Zadokdeb21db2008-02-07 00:13:25 -0800656 error = do_vfs_ioctl(filp, fd, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 out_fput:
658 fput_light(filp, fput_needed);
659 out:
660 return error;
661}