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lustre: remove unused declaration
[people/ms/linux.git] / fs / ext4 / ioctl.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/ioctl.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 */
9
10#include <linux/fs.h>
ac27a0ec 11#include <linux/capability.h>
ac27a0ec
DK		 12#include <linux/time.h>
13#include <linux/compat.h>
42a74f20 14#include <linux/mount.h>
748de673 15#include <linux/file.h>
9bd8212f 16#include <linux/random.h>
9b7365fc 17#include <linux/quotaops.h>
ac27a0ec 18#include <asm/uaccess.h>
3dcf5451
CH		 19#include "ext4_jbd2.h"
20#include "ext4.h"
ac27a0ec 21
19c5246d
YY		 22#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
23
393d1d1d
DTB		 24/**
25 * Swap memory between @a and @b for @len bytes.
26 *
27 * @a: pointer to first memory area
28 * @b: pointer to second memory area
29 * @len: number of bytes to swap
30 *
31 */
32static void memswap(void *a, void *b, size_t len)
33{
34 unsigned char *ap, *bp;
393d1d1d
DTB		 35
36 ap = (unsigned char *)a;
37 bp = (unsigned char *)b;
38 while (len-- > 0) {
4b7e2db5 39 swap(*ap, *bp);
393d1d1d
DTB		 40 ap++;
41 bp++;
42 }
43}
44
45/**
46 * Swap i_data and associated attributes between @inode1 and @inode2.
47 * This function is used for the primary swap between inode1 and inode2
48 * and also to revert this primary swap in case of errors.
49 *
50 * Therefore you have to make sure, that calling this method twice
51 * will revert all changes.
52 *
53 * @inode1: pointer to first inode
54 * @inode2: pointer to second inode
55 */
56static void swap_inode_data(struct inode *inode1, struct inode *inode2)
57{
58 loff_t isize;
59 struct ext4_inode_info *ei1;
60 struct ext4_inode_info *ei2;
61
62 ei1 = EXT4_I(inode1);
63 ei2 = EXT4_I(inode2);
64
65 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
66 memswap(&inode1->i_version, &inode2->i_version,
67 sizeof(inode1->i_version));
68 memswap(&inode1->i_blocks, &inode2->i_blocks,
69 sizeof(inode1->i_blocks));
70 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
71 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
72 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
73
74 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
75 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
76 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
cde2d7a7
TT		 77 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
78 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
393d1d1d
DTB		 79
80 isize = i_size_read(inode1);
81 i_size_write(inode1, i_size_read(inode2));
82 i_size_write(inode2, isize);
83}
84
85/**
86 * Swap the information from the given @inode and the inode
87 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
88 * important fields of the inodes.
89 *
90 * @sb: the super block of the filesystem
91 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
92 *
93 */
94static long swap_inode_boot_loader(struct super_block *sb,
95 struct inode *inode)
96{
97 handle_t *handle;
98 int err;
99 struct inode *inode_bl;
393d1d1d 100 struct ext4_inode_info *ei_bl;
d7092ae2 101 struct ext4_sb_info *sbi = EXT4_SB(sb);
393d1d1d 102
d8558a29
TT		 103 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
104 return -EINVAL;
393d1d1d 105
d8558a29
TT		 106 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
107 return -EPERM;
393d1d1d 108
393d1d1d 109 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
d8558a29
TT		 110 if (IS_ERR(inode_bl))
111 return PTR_ERR(inode_bl);
393d1d1d
DTB		 112 ei_bl = EXT4_I(inode_bl);
113
114 filemap_flush(inode->i_mapping);
115 filemap_flush(inode_bl->i_mapping);
116
117 /* Protect orig inodes against a truncate and make sure,
118 * that only 1 swap_inode_boot_loader is running. */
375e289e 119 lock_two_nondirectories(inode, inode_bl);
393d1d1d
DTB		 120
121 truncate_inode_pages(&inode->i_data, 0);
122 truncate_inode_pages(&inode_bl->i_data, 0);
123
124 /* Wait for all existing dio workers */
125 ext4_inode_block_unlocked_dio(inode);
126 ext4_inode_block_unlocked_dio(inode_bl);
127 inode_dio_wait(inode);
128 inode_dio_wait(inode_bl);
129
130 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
131 if (IS_ERR(handle)) {
132 err = -EINVAL;
30d29b11 133 goto journal_err_out;
393d1d1d
DTB		 134 }
135
136 /* Protect extent tree against block allocations via delalloc */
137 ext4_double_down_write_data_sem(inode, inode_bl);
138
139 if (inode_bl->i_nlink == 0) {
140 /* this inode has never been used as a BOOT_LOADER */
141 set_nlink(inode_bl, 1);
142 i_uid_write(inode_bl, 0);
143 i_gid_write(inode_bl, 0);
144 inode_bl->i_flags = 0;
145 ei_bl->i_flags = 0;
146 inode_bl->i_version = 1;
147 i_size_write(inode_bl, 0);
148 inode_bl->i_mode = S_IFREG;
e2b911c5 149 if (ext4_has_feature_extents(sb)) {
393d1d1d
DTB		 150 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
151 ext4_ext_tree_init(handle, inode_bl);
152 } else
153 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
154 }
155
156 swap_inode_data(inode, inode_bl);
157
158 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
159
160 spin_lock(&sbi->s_next_gen_lock);
161 inode->i_generation = sbi->s_next_generation++;
162 inode_bl->i_generation = sbi->s_next_generation++;
163 spin_unlock(&sbi->s_next_gen_lock);
164
165 ext4_discard_preallocations(inode);
166
167 err = ext4_mark_inode_dirty(handle, inode);
168 if (err < 0) {
169 ext4_warning(inode->i_sb,
170 "couldn't mark inode #%lu dirty (err %d)",
171 inode->i_ino, err);
172 /* Revert all changes: */
173 swap_inode_data(inode, inode_bl);
174 } else {
175 err = ext4_mark_inode_dirty(handle, inode_bl);
176 if (err < 0) {
177 ext4_warning(inode_bl->i_sb,
178 "couldn't mark inode #%lu dirty (err %d)",
179 inode_bl->i_ino, err);
180 /* Revert all changes: */
181 swap_inode_data(inode, inode_bl);
182 ext4_mark_inode_dirty(handle, inode);
183 }
184 }
393d1d1d 185 ext4_journal_stop(handle);
393d1d1d
DTB		 186 ext4_double_up_write_data_sem(inode, inode_bl);
187
30d29b11 188journal_err_out:
393d1d1d
DTB		 189 ext4_inode_resume_unlocked_dio(inode);
190 ext4_inode_resume_unlocked_dio(inode_bl);
375e289e 191 unlock_two_nondirectories(inode, inode_bl);
393d1d1d 192 iput(inode_bl);
393d1d1d
DTB		 193 return err;
194}
195
9bd8212f
MH		 196static int uuid_is_zero(__u8 u[16])
197{
198 int i;
199
200 for (i = 0; i < 16; i++)
201 if (u[i])
202 return 0;
203 return 1;
204}
205
9b7365fc
LX		 206static int ext4_ioctl_setflags(struct inode *inode,
207 unsigned int flags)
208{
209 struct ext4_inode_info *ei = EXT4_I(inode);
210 handle_t *handle = NULL;
211 int err = EPERM, migrate = 0;
212 struct ext4_iloc iloc;
213 unsigned int oldflags, mask, i;
214 unsigned int jflag;
215
216 /* Is it quota file? Do not allow user to mess with it */
217 if (IS_NOQUOTA(inode))
218 goto flags_out;
219
220 oldflags = ei->i_flags;
221
222 /* The JOURNAL_DATA flag is modifiable only by root */
223 jflag = flags & EXT4_JOURNAL_DATA_FL;
224
225 /*
226 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
227 * the relevant capability.
228 *
229 * This test looks nicer. Thanks to Pauline Middelink
230 */
231 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
232 if (!capable(CAP_LINUX_IMMUTABLE))
233 goto flags_out;
234 }
235
236 /*
237 * The JOURNAL_DATA flag can only be changed by
238 * the relevant capability.
239 */
240 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
241 if (!capable(CAP_SYS_RESOURCE))
242 goto flags_out;
243 }
244 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
245 migrate = 1;
246
247 if (flags & EXT4_EOFBLOCKS_FL) {
248 /* we don't support adding EOFBLOCKS flag */
249 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
250 err = -EOPNOTSUPP;
251 goto flags_out;
252 }
253 } else if (oldflags & EXT4_EOFBLOCKS_FL)
254 ext4_truncate(inode);
255
256 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
257 if (IS_ERR(handle)) {
258 err = PTR_ERR(handle);
259 goto flags_out;
260 }
261 if (IS_SYNC(inode))
262 ext4_handle_sync(handle);
263 err = ext4_reserve_inode_write(handle, inode, &iloc);
264 if (err)
265 goto flags_err;
266
267 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
268 if (!(mask & EXT4_FL_USER_MODIFIABLE))
269 continue;
270 if (mask & flags)
271 ext4_set_inode_flag(inode, i);
272 else
273 ext4_clear_inode_flag(inode, i);
274 }
275
276 ext4_set_inode_flags(inode);
277 inode->i_ctime = ext4_current_time(inode);
278
279 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
280flags_err:
281 ext4_journal_stop(handle);
282 if (err)
283 goto flags_out;
284
285 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
286 err = ext4_change_inode_journal_flag(inode, jflag);
287 if (err)
288 goto flags_out;
289 if (migrate) {
290 if (flags & EXT4_EXTENTS_FL)
291 err = ext4_ext_migrate(inode);
292 else
293 err = ext4_ind_migrate(inode);
294 }
295
296flags_out:
297 return err;
298}
299
300#ifdef CONFIG_QUOTA
301static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
302{
303 struct inode *inode = file_inode(filp);
304 struct super_block *sb = inode->i_sb;
305 struct ext4_inode_info *ei = EXT4_I(inode);
306 int err, rc;
307 handle_t *handle;
308 kprojid_t kprojid;
309 struct ext4_iloc iloc;
310 struct ext4_inode *raw_inode;
311
312 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
313 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
314 if (projid != EXT4_DEF_PROJID)
315 return -EOPNOTSUPP;
316 else
317 return 0;
318 }
319
320 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
321 return -EOPNOTSUPP;
322
323 kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
324
325 if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
326 return 0;
327
328 err = mnt_want_write_file(filp);
329 if (err)
330 return err;
331
332 err = -EPERM;
333 mutex_lock(&inode->i_mutex);
334 /* Is it quota file? Do not allow user to mess with it */
335 if (IS_NOQUOTA(inode))
336 goto out_unlock;
337
338 err = ext4_get_inode_loc(inode, &iloc);
339 if (err)
340 goto out_unlock;
341
342 raw_inode = ext4_raw_inode(&iloc);
343 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
344 err = -EOVERFLOW;
345 brelse(iloc.bh);
346 goto out_unlock;
347 }
348 brelse(iloc.bh);
349
350 dquot_initialize(inode);
351
352 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
353 EXT4_QUOTA_INIT_BLOCKS(sb) +
354 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
355 if (IS_ERR(handle)) {
356 err = PTR_ERR(handle);
357 goto out_unlock;
358 }
359
360 err = ext4_reserve_inode_write(handle, inode, &iloc);
361 if (err)
362 goto out_stop;
363
364 if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
365 struct dquot *transfer_to[MAXQUOTAS] = { };
366
367 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
368 if (transfer_to[PRJQUOTA]) {
369 err = __dquot_transfer(inode, transfer_to);
370 dqput(transfer_to[PRJQUOTA]);
371 if (err)
372 goto out_dirty;
373 }
374 }
375 EXT4_I(inode)->i_projid = kprojid;
376 inode->i_ctime = ext4_current_time(inode);
377out_dirty:
378 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
379 if (!err)
380 err = rc;
381out_stop:
382 ext4_journal_stop(handle);
383out_unlock:
384 mutex_unlock(&inode->i_mutex);
385 mnt_drop_write_file(filp);
386 return err;
387}
388#else
389static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
390{
391 if (projid != EXT4_DEF_PROJID)
392 return -EOPNOTSUPP;
393 return 0;
394}
395#endif
396
397/* Transfer internal flags to xflags */
398static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
399{
400 __u32 xflags = 0;
401
402 if (iflags & EXT4_SYNC_FL)
403 xflags |= FS_XFLAG_SYNC;
404 if (iflags & EXT4_IMMUTABLE_FL)
405 xflags |= FS_XFLAG_IMMUTABLE;
406 if (iflags & EXT4_APPEND_FL)
407 xflags |= FS_XFLAG_APPEND;
408 if (iflags & EXT4_NODUMP_FL)
409 xflags |= FS_XFLAG_NODUMP;
410 if (iflags & EXT4_NOATIME_FL)
411 xflags |= FS_XFLAG_NOATIME;
412 if (iflags & EXT4_PROJINHERIT_FL)
413 xflags |= FS_XFLAG_PROJINHERIT;
414 return xflags;
415}
416
417/* Transfer xflags flags to internal */
418static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
419{
420 unsigned long iflags = 0;
421
422 if (xflags & FS_XFLAG_SYNC)
423 iflags |= EXT4_SYNC_FL;
424 if (xflags & FS_XFLAG_IMMUTABLE)
425 iflags |= EXT4_IMMUTABLE_FL;
426 if (xflags & FS_XFLAG_APPEND)
427 iflags |= EXT4_APPEND_FL;
428 if (xflags & FS_XFLAG_NODUMP)
429 iflags |= EXT4_NODUMP_FL;
430 if (xflags & FS_XFLAG_NOATIME)
431 iflags |= EXT4_NOATIME_FL;
432 if (xflags & FS_XFLAG_PROJINHERIT)
433 iflags |= EXT4_PROJINHERIT_FL;
434
435 return iflags;
436}
437
5cdd7b2d 438long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ac27a0ec 439{
496ad9aa 440 struct inode *inode = file_inode(filp);
bab08ab9 441 struct super_block *sb = inode->i_sb;
617ba13b 442 struct ext4_inode_info *ei = EXT4_I(inode);
ac27a0ec 443 unsigned int flags;
ac27a0ec 444
af5bc92d 445 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
ac27a0ec
DK		 446
447 switch (cmd) {
617ba13b 448 case EXT4_IOC_GETFLAGS:
ff9ddf7e 449 ext4_get_inode_flags(ei);
617ba13b 450 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
ac27a0ec 451 return put_user(flags, (int __user *) arg);
617ba13b 452 case EXT4_IOC_SETFLAGS: {
9b7365fc 453 int err;
ac27a0ec 454
2e149670 455 if (!inode_owner_or_capable(inode))
ac27a0ec
DK		 456 return -EACCES;
457
458 if (get_user(flags, (int __user *) arg))
459 return -EFAULT;
460
a561be71 461 err = mnt_want_write_file(filp);
42a74f20
DH		 462 if (err)
463 return err;
464
2dc6b0d4 465 flags = ext4_mask_flags(inode->i_mode, flags);
ac27a0ec
DK		 466
467 mutex_lock(&inode->i_mutex);
9b7365fc 468 err = ext4_ioctl_setflags(inode, flags);
ac27a0ec 469 mutex_unlock(&inode->i_mutex);
2a79f17e 470 mnt_drop_write_file(filp);
ac27a0ec
DK		 471 return err;
472 }
617ba13b
MC		 473 case EXT4_IOC_GETVERSION:
474 case EXT4_IOC_GETVERSION_OLD:
ac27a0ec 475 return put_user(inode->i_generation, (int __user *) arg);
617ba13b
MC		 476 case EXT4_IOC_SETVERSION:
477 case EXT4_IOC_SETVERSION_OLD: {
ac27a0ec 478 handle_t *handle;
617ba13b 479 struct ext4_iloc iloc;
ac27a0ec
DK		 480 __u32 generation;
481 int err;
482
2e149670 483 if (!inode_owner_or_capable(inode))
ac27a0ec 484 return -EPERM;
42a74f20 485
9aa5d32b 486 if (ext4_has_metadata_csum(inode->i_sb)) {
814525f4
DW		 487 ext4_warning(sb, "Setting inode version is not "
488 "supported with metadata_csum enabled.");
489 return -ENOTTY;
490 }
491
a561be71 492 err = mnt_want_write_file(filp);
42a74f20
DH		 493 if (err)
494 return err;
495 if (get_user(generation, (int __user *) arg)) {
496 err = -EFAULT;
497 goto setversion_out;
498 }
ac27a0ec 499
6c2155b9 500 mutex_lock(&inode->i_mutex);
9924a92a 501 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
42a74f20
DH		 502 if (IS_ERR(handle)) {
503 err = PTR_ERR(handle);
6c2155b9 504 goto unlock_out;
42a74f20 505 }
617ba13b 506 err = ext4_reserve_inode_write(handle, inode, &iloc);
ac27a0ec 507 if (err == 0) {
ef7f3835 508 inode->i_ctime = ext4_current_time(inode);
ac27a0ec 509 inode->i_generation = generation;
617ba13b 510 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
ac27a0ec 511 }
617ba13b 512 ext4_journal_stop(handle);
6c2155b9
DH		 513
514unlock_out:
515 mutex_unlock(&inode->i_mutex);
42a74f20 516setversion_out:
2a79f17e 517 mnt_drop_write_file(filp);
ac27a0ec
DK		 518 return err;
519 }
617ba13b
MC		 520 case EXT4_IOC_GROUP_EXTEND: {
521 ext4_fsblk_t n_blocks_count;
ac046f1d 522 int err, err2=0;
ac27a0ec 523
8f82f840
YY		 524 err = ext4_resize_begin(sb);
525 if (err)
526 return err;
ac27a0ec 527
014a1770
DH		 528 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
529 err = -EFAULT;
530 goto group_extend_out;
531 }
ac27a0ec 532
e2b911c5 533 if (ext4_has_feature_bigalloc(sb)) {
bab08ab9
TT		 534 ext4_msg(sb, KERN_ERR,
535 "Online resizing not supported with bigalloc");
014a1770
DH		 536 err = -EOPNOTSUPP;
537 goto group_extend_out;
bab08ab9
TT		 538 }
539
a561be71 540 err = mnt_want_write_file(filp);
42a74f20 541 if (err)
014a1770 542 goto group_extend_out;
42a74f20 543
617ba13b 544 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
ac046f1d
PT		 545 if (EXT4_SB(sb)->s_journal) {
546 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
547 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
548 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
549 }
7ffe1ea8
HK		 550 if (err == 0)
551 err = err2;
2a79f17e 552 mnt_drop_write_file(filp);
014a1770 553group_extend_out:
8f82f840 554 ext4_resize_end(sb);
ac27a0ec
DK		 555 return err;
556 }
748de673
AF		 557
558 case EXT4_IOC_MOVE_EXT: {
559 struct move_extent me;
2903ff01
AV		 560 struct fd donor;
561 int err;
748de673 562
4a58579b
AF		 563 if (!(filp->f_mode & FMODE_READ) ||
564 !(filp->f_mode & FMODE_WRITE))
565 return -EBADF;
566
748de673
AF		 567 if (copy_from_user(&me,
568 (struct move_extent __user *)arg, sizeof(me)))
569 return -EFAULT;
4a58579b 570 me.moved_len = 0;
748de673 571
2903ff01
AV		 572 donor = fdget(me.donor_fd);
573 if (!donor.file)
748de673
AF		 574 return -EBADF;
575
2903ff01 576 if (!(donor.file->f_mode & FMODE_WRITE)) {
4a58579b
AF		 577 err = -EBADF;
578 goto mext_out;
748de673
AF		 579 }
580
e2b911c5 581 if (ext4_has_feature_bigalloc(sb)) {
bab08ab9
TT		 582 ext4_msg(sb, KERN_ERR,
583 "Online defrag not supported with bigalloc");
399c9b86
AV		 584 err = -EOPNOTSUPP;
585 goto mext_out;
bab08ab9
TT		 586 }
587
a561be71 588 err = mnt_want_write_file(filp);
4a58579b
AF		 589 if (err)
590 goto mext_out;
591
2903ff01 592 err = ext4_move_extents(filp, donor.file, me.orig_start,
748de673 593 me.donor_start, me.len, &me.moved_len);
2a79f17e 594 mnt_drop_write_file(filp);
748de673 595
60e6679e 596 if (copy_to_user((struct move_extent __user *)arg,
c437b273 597 &me, sizeof(me)))
4a58579b
AF		 598 err = -EFAULT;
599mext_out:
2903ff01 600 fdput(donor);
748de673
AF		 601 return err;
602 }
603
617ba13b
MC		 604 case EXT4_IOC_GROUP_ADD: {
605 struct ext4_new_group_data input;
ac046f1d 606 int err, err2=0;
ac27a0ec 607
8f82f840
YY		 608 err = ext4_resize_begin(sb);
609 if (err)
610 return err;
ac27a0ec 611
617ba13b 612 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
014a1770
DH		 613 sizeof(input))) {
614 err = -EFAULT;
615 goto group_add_out;
616 }
ac27a0ec 617
e2b911c5 618 if (ext4_has_feature_bigalloc(sb)) {
bab08ab9
TT		 619 ext4_msg(sb, KERN_ERR,
620 "Online resizing not supported with bigalloc");
014a1770
DH		 621 err = -EOPNOTSUPP;
622 goto group_add_out;
bab08ab9
TT		 623 }
624
a561be71 625 err = mnt_want_write_file(filp);
42a74f20 626 if (err)
014a1770 627 goto group_add_out;
42a74f20 628
617ba13b 629 err = ext4_group_add(sb, &input);
ac046f1d
PT		 630 if (EXT4_SB(sb)->s_journal) {
631 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
632 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
633 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
634 }
7ffe1ea8
HK		 635 if (err == 0)
636 err = err2;
2a79f17e 637 mnt_drop_write_file(filp);
7f511862
TT		 638 if (!err && ext4_has_group_desc_csum(sb) &&
639 test_opt(sb, INIT_INODE_TABLE))
640 err = ext4_register_li_request(sb, input.group);
014a1770 641group_add_out:
8f82f840 642 ext4_resize_end(sb);
ac27a0ec
DK		 643 return err;
644 }
645
c14c6fd5 646 case EXT4_IOC_MIGRATE:
2a43a878
AK		 647 {
648 int err;
2e149670 649 if (!inode_owner_or_capable(inode))
2a43a878
AK		 650 return -EACCES;
651
a561be71 652 err = mnt_want_write_file(filp);
2a43a878
AK		 653 if (err)
654 return err;
655 /*
656 * inode_mutex prevent write and truncate on the file.
657 * Read still goes through. We take i_data_sem in
658 * ext4_ext_swap_inode_data before we switch the
659 * inode format to prevent read.
660 */
661 mutex_lock(&(inode->i_mutex));
662 err = ext4_ext_migrate(inode);
663 mutex_unlock(&(inode->i_mutex));
2a79f17e 664 mnt_drop_write_file(filp);
2a43a878
AK		 665 return err;
666 }
c14c6fd5 667
ccd2506b
TT		 668 case EXT4_IOC_ALLOC_DA_BLKS:
669 {
670 int err;
2e149670 671 if (!inode_owner_or_capable(inode))
ccd2506b
TT		 672 return -EACCES;
673
a561be71 674 err = mnt_want_write_file(filp);
ccd2506b
TT		 675 if (err)
676 return err;
677 err = ext4_alloc_da_blocks(inode);
2a79f17e 678 mnt_drop_write_file(filp);
ccd2506b
TT		 679 return err;
680 }
681
393d1d1d 682 case EXT4_IOC_SWAP_BOOT:
3e67cfad
DM		 683 {
684 int err;
393d1d1d
DTB		 685 if (!(filp->f_mode & FMODE_WRITE))
686 return -EBADF;
3e67cfad
DM		 687 err = mnt_want_write_file(filp);
688 if (err)
689 return err;
690 err = swap_inode_boot_loader(sb, inode);
691 mnt_drop_write_file(filp);
692 return err;
693 }
393d1d1d 694
19c5246d
YY		 695 case EXT4_IOC_RESIZE_FS: {
696 ext4_fsblk_t n_blocks_count;
19c5246d 697 int err = 0, err2 = 0;
7f511862 698 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
19c5246d 699
e2b911c5 700 if (ext4_has_feature_bigalloc(sb)) {
19c5246d
YY		 701 ext4_msg(sb, KERN_ERR,
702 "Online resizing not (yet) supported with bigalloc");
703 return -EOPNOTSUPP;
704 }
705
19c5246d
YY		 706 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
707 sizeof(__u64))) {
708 return -EFAULT;
709 }
710
19c5246d
YY		 711 err = ext4_resize_begin(sb);
712 if (err)
713 return err;
714
8cae6f71 715 err = mnt_want_write_file(filp);
19c5246d
YY		 716 if (err)
717 goto resizefs_out;
718
719 err = ext4_resize_fs(sb, n_blocks_count);
720 if (EXT4_SB(sb)->s_journal) {
721 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
722 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
723 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
724 }
725 if (err == 0)
726 err = err2;
8cae6f71 727 mnt_drop_write_file(filp);
7f511862
TT		 728 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
729 ext4_has_group_desc_csum(sb) &&
730 test_opt(sb, INIT_INODE_TABLE))
731 err = ext4_register_li_request(sb, o_group);
732
19c5246d
YY		 733resizefs_out:
734 ext4_resize_end(sb);
735 return err;
736 }
737
e681c047
LC		 738 case FITRIM:
739 {
41431792 740 struct request_queue *q = bdev_get_queue(sb->s_bdev);
e681c047
LC		 741 struct fstrim_range range;
742 int ret = 0;
743
744 if (!capable(CAP_SYS_ADMIN))
745 return -EPERM;
746
41431792
LC		 747 if (!blk_queue_discard(q))
748 return -EOPNOTSUPP;
749
e6705f7c 750 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
e681c047
LC		 751 sizeof(range)))
752 return -EFAULT;
753
5c2ed62f
LC		 754 range.minlen = max((unsigned int)range.minlen,
755 q->limits.discard_granularity);
e681c047
LC		 756 ret = ext4_trim_fs(sb, &range);
757 if (ret < 0)
758 return ret;
759
e6705f7c 760 if (copy_to_user((struct fstrim_range __user *)arg, &range,
e681c047
LC		 761 sizeof(range)))
762 return -EFAULT;
763
764 return 0;
765 }
7869a4a6
TT		 766 case EXT4_IOC_PRECACHE_EXTENTS:
767 return ext4_ext_precache(inode);
9bd8212f
MH		 768 case EXT4_IOC_SET_ENCRYPTION_POLICY: {
769#ifdef CONFIG_EXT4_FS_ENCRYPTION
770 struct ext4_encryption_policy policy;
771 int err = 0;
772
773 if (copy_from_user(&policy,
774 (struct ext4_encryption_policy __user *)arg,
775 sizeof(policy))) {
776 err = -EFAULT;
777 goto encryption_policy_out;
778 }
e681c047 779
9bd8212f
MH		 780 err = ext4_process_policy(&policy, inode);
781encryption_policy_out:
782 return err;
783#else
784 return -EOPNOTSUPP;
785#endif
786 }
787 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
788 int err, err2;
789 struct ext4_sb_info *sbi = EXT4_SB(sb);
790 handle_t *handle;
791
792 if (!ext4_sb_has_crypto(sb))
793 return -EOPNOTSUPP;
794 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
795 err = mnt_want_write_file(filp);
796 if (err)
797 return err;
798 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
799 if (IS_ERR(handle)) {
800 err = PTR_ERR(handle);
801 goto pwsalt_err_exit;
802 }
803 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
804 if (err)
805 goto pwsalt_err_journal;
806 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
807 err = ext4_handle_dirty_metadata(handle, NULL,
808 sbi->s_sbh);
809 pwsalt_err_journal:
810 err2 = ext4_journal_stop(handle);
811 if (err2 && !err)
812 err = err2;
813 pwsalt_err_exit:
814 mnt_drop_write_file(filp);
815 if (err)
816 return err;
817 }
b4ab9e29
FF		 818 if (copy_to_user((void __user *) arg,
819 sbi->s_es->s_encrypt_pw_salt, 16))
9bd8212f
MH		 820 return -EFAULT;
821 return 0;
822 }
823 case EXT4_IOC_GET_ENCRYPTION_POLICY: {
824#ifdef CONFIG_EXT4_FS_ENCRYPTION
825 struct ext4_encryption_policy policy;
826 int err = 0;
827
828 if (!ext4_encrypted_inode(inode))
829 return -ENOENT;
830 err = ext4_get_policy(inode, &policy);
831 if (err)
832 return err;
b4ab9e29 833 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
9bd8212f
MH		 834 return -EFAULT;
835 return 0;
836#else
837 return -EOPNOTSUPP;
838#endif
839 }
9b7365fc
LX		 840 case EXT4_IOC_FSGETXATTR:
841 {
842 struct fsxattr fa;
843
844 memset(&fa, 0, sizeof(struct fsxattr));
845 ext4_get_inode_flags(ei);
846 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
847
848 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
849 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
850 fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
851 EXT4_I(inode)->i_projid);
852 }
853
854 if (copy_to_user((struct fsxattr __user *)arg,
855 &fa, sizeof(fa)))
856 return -EFAULT;
857 return 0;
858 }
859 case EXT4_IOC_FSSETXATTR:
860 {
861 struct fsxattr fa;
862 int err;
863
864 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
865 sizeof(fa)))
866 return -EFAULT;
867
868 /* Make sure caller has proper permission */
869 if (!inode_owner_or_capable(inode))
870 return -EACCES;
871
872 err = mnt_want_write_file(filp);
873 if (err)
874 return err;
875
876 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
877 flags = ext4_mask_flags(inode->i_mode, flags);
878
879 mutex_lock(&inode->i_mutex);
880 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
881 (flags & EXT4_FL_XFLAG_VISIBLE);
882 err = ext4_ioctl_setflags(inode, flags);
883 mutex_unlock(&inode->i_mutex);
884 mnt_drop_write_file(filp);
885 if (err)
886 return err;
887
888 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
889 if (err)
890 return err;
891
892 return 0;
893 }
ac27a0ec
DK		 894 default:
895 return -ENOTTY;
896 }
897}
898
899#ifdef CONFIG_COMPAT
617ba13b 900long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
ac27a0ec 901{
ac27a0ec
DK		 902 /* These are just misnamed, they actually get/put from/to user an int */
903 switch (cmd) {
617ba13b
MC		 904 case EXT4_IOC32_GETFLAGS:
905 cmd = EXT4_IOC_GETFLAGS;
ac27a0ec 906 break;
617ba13b
MC		 907 case EXT4_IOC32_SETFLAGS:
908 cmd = EXT4_IOC_SETFLAGS;
ac27a0ec 909 break;
617ba13b
MC		 910 case EXT4_IOC32_GETVERSION:
911 cmd = EXT4_IOC_GETVERSION;
ac27a0ec 912 break;
617ba13b
MC		 913 case EXT4_IOC32_SETVERSION:
914 cmd = EXT4_IOC_SETVERSION;
ac27a0ec 915 break;
617ba13b
MC		 916 case EXT4_IOC32_GROUP_EXTEND:
917 cmd = EXT4_IOC_GROUP_EXTEND;
ac27a0ec 918 break;
617ba13b
MC		 919 case EXT4_IOC32_GETVERSION_OLD:
920 cmd = EXT4_IOC_GETVERSION_OLD;
ac27a0ec 921 break;
617ba13b
MC		 922 case EXT4_IOC32_SETVERSION_OLD:
923 cmd = EXT4_IOC_SETVERSION_OLD;
ac27a0ec 924 break;
617ba13b
MC		 925 case EXT4_IOC32_GETRSVSZ:
926 cmd = EXT4_IOC_GETRSVSZ;
ac27a0ec 927 break;
617ba13b
MC		 928 case EXT4_IOC32_SETRSVSZ:
929 cmd = EXT4_IOC_SETRSVSZ;
ac27a0ec 930 break;
4d92dc0f
BH		 931 case EXT4_IOC32_GROUP_ADD: {
932 struct compat_ext4_new_group_input __user *uinput;
933 struct ext4_new_group_input input;
934 mm_segment_t old_fs;
935 int err;
936
937 uinput = compat_ptr(arg);
938 err = get_user(input.group, &uinput->group);
939 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
940 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
941 err |= get_user(input.inode_table, &uinput->inode_table);
942 err |= get_user(input.blocks_count, &uinput->blocks_count);
943 err |= get_user(input.reserved_blocks,
944 &uinput->reserved_blocks);
945 if (err)
946 return -EFAULT;
947 old_fs = get_fs();
948 set_fs(KERNEL_DS);
949 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
950 (unsigned long) &input);
951 set_fs(old_fs);
952 return err;
953 }
b684b2ee 954 case EXT4_IOC_MOVE_EXT:
19c5246d 955 case EXT4_IOC_RESIZE_FS:
7869a4a6 956 case EXT4_IOC_PRECACHE_EXTENTS:
9bd8212f
MH		 957 case EXT4_IOC_SET_ENCRYPTION_POLICY:
958 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
959 case EXT4_IOC_GET_ENCRYPTION_POLICY:
b684b2ee 960 break;
ac27a0ec
DK		 961 default:
962 return -ENOIOCTLCMD;
963 }
5cdd7b2d 964 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
ac27a0ec
DK		 965}
966#endif
Michael's Linux tree.