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1/*
2 * linux/fs/ext4/ioctl.c
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>
11#include <linux/jbd2.h>
12#include <linux/capability.h>
13#include <linux/time.h>
14#include <linux/compat.h>
15#include <linux/mount.h>
16#include <linux/file.h>
17#include <asm/uaccess.h>
18#include "ext4_jbd2.h"
19#include "ext4.h"
20
21#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
22
23long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
24{
25 struct inode *inode = filp->f_dentry->d_inode;
26 struct super_block *sb = inode->i_sb;
27 struct ext4_inode_info *ei = EXT4_I(inode);
28 unsigned int flags;
29
30 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
31
32 switch (cmd) {
33 case EXT4_IOC_GETFLAGS:
34 ext4_get_inode_flags(ei);
35 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
36 return put_user(flags, (int __user *) arg);
37 case EXT4_IOC_SETFLAGS: {
38 handle_t *handle = NULL;
39 int err, migrate = 0;
40 struct ext4_iloc iloc;
41 unsigned int oldflags, mask, i;
42 unsigned int jflag;
43
44 if (!inode_owner_or_capable(inode))
45 return -EACCES;
46
47 if (get_user(flags, (int __user *) arg))
48 return -EFAULT;
49
50 err = mnt_want_write_file(filp);
51 if (err)
52 return err;
53
54 flags = ext4_mask_flags(inode->i_mode, flags);
55
56 err = -EPERM;
57 mutex_lock(&inode->i_mutex);
58 /* Is it quota file? Do not allow user to mess with it */
59 if (IS_NOQUOTA(inode))
60 goto flags_out;
61
62 oldflags = ei->i_flags;
63
64 /* The JOURNAL_DATA flag is modifiable only by root */
65 jflag = flags & EXT4_JOURNAL_DATA_FL;
66
67 /*
68 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
69 * the relevant capability.
70 *
71 * This test looks nicer. Thanks to Pauline Middelink
72 */
73 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
74 if (!capable(CAP_LINUX_IMMUTABLE))
75 goto flags_out;
76 }
77
78 /*
79 * The JOURNAL_DATA flag can only be changed by
80 * the relevant capability.
81 */
82 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
83 if (!capable(CAP_SYS_RESOURCE))
84 goto flags_out;
85 }
86 if (oldflags & EXT4_EXTENTS_FL) {
87 /* We don't support clearning extent flags */
88 if (!(flags & EXT4_EXTENTS_FL)) {
89 err = -EOPNOTSUPP;
90 goto flags_out;
91 }
92 } else if (flags & EXT4_EXTENTS_FL) {
93 /* migrate the file */
94 migrate = 1;
95 flags &= ~EXT4_EXTENTS_FL;
96 }
97
98 if (flags & EXT4_EOFBLOCKS_FL) {
99 /* we don't support adding EOFBLOCKS flag */
100 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
101 err = -EOPNOTSUPP;
102 goto flags_out;
103 }
104 } else if (oldflags & EXT4_EOFBLOCKS_FL)
105 ext4_truncate(inode);
106
107 handle = ext4_journal_start(inode, 1);
108 if (IS_ERR(handle)) {
109 err = PTR_ERR(handle);
110 goto flags_out;
111 }
112 if (IS_SYNC(inode))
113 ext4_handle_sync(handle);
114 err = ext4_reserve_inode_write(handle, inode, &iloc);
115 if (err)
116 goto flags_err;
117
118 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
119 if (!(mask & EXT4_FL_USER_MODIFIABLE))
120 continue;
121 if (mask & flags)
122 ext4_set_inode_flag(inode, i);
123 else
124 ext4_clear_inode_flag(inode, i);
125 }
126
127 ext4_set_inode_flags(inode);
128 inode->i_ctime = ext4_current_time(inode);
129
130 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
131flags_err:
132 ext4_journal_stop(handle);
133 if (err)
134 goto flags_out;
135
136 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
137 err = ext4_change_inode_journal_flag(inode, jflag);
138 if (err)
139 goto flags_out;
140 if (migrate)
141 err = ext4_ext_migrate(inode);
142flags_out:
143 mutex_unlock(&inode->i_mutex);
144 mnt_drop_write_file(filp);
145 return err;
146 }
147 case EXT4_IOC_GETVERSION:
148 case EXT4_IOC_GETVERSION_OLD:
149 return put_user(inode->i_generation, (int __user *) arg);
150 case EXT4_IOC_SETVERSION:
151 case EXT4_IOC_SETVERSION_OLD: {
152 handle_t *handle;
153 struct ext4_iloc iloc;
154 __u32 generation;
155 int err;
156
157 if (!inode_owner_or_capable(inode))
158 return -EPERM;
159
160 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
161 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
162 ext4_warning(sb, "Setting inode version is not "
163 "supported with metadata_csum enabled.");
164 return -ENOTTY;
165 }
166
167 err = mnt_want_write_file(filp);
168 if (err)
169 return err;
170 if (get_user(generation, (int __user *) arg)) {
171 err = -EFAULT;
172 goto setversion_out;
173 }
174
175 mutex_lock(&inode->i_mutex);
176 handle = ext4_journal_start(inode, 1);
177 if (IS_ERR(handle)) {
178 err = PTR_ERR(handle);
179 goto unlock_out;
180 }
181 err = ext4_reserve_inode_write(handle, inode, &iloc);
182 if (err == 0) {
183 inode->i_ctime = ext4_current_time(inode);
184 inode->i_generation = generation;
185 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
186 }
187 ext4_journal_stop(handle);
188
189unlock_out:
190 mutex_unlock(&inode->i_mutex);
191setversion_out:
192 mnt_drop_write_file(filp);
193 return err;
194 }
195 case EXT4_IOC_GROUP_EXTEND: {
196 ext4_fsblk_t n_blocks_count;
197 int err, err2=0;
198
199 err = ext4_resize_begin(sb);
200 if (err)
201 return err;
202
203 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
204 err = -EFAULT;
205 goto group_extend_out;
206 }
207
208 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
209 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
210 ext4_msg(sb, KERN_ERR,
211 "Online resizing not supported with bigalloc");
212 err = -EOPNOTSUPP;
213 goto group_extend_out;
214 }
215
216 err = mnt_want_write_file(filp);
217 if (err)
218 goto group_extend_out;
219
220 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
221 if (EXT4_SB(sb)->s_journal) {
222 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
223 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
224 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
225 }
226 if (err == 0)
227 err = err2;
228 mnt_drop_write_file(filp);
229group_extend_out:
230 ext4_resize_end(sb);
231 return err;
232 }
233
234 case EXT4_IOC_MOVE_EXT: {
235 struct move_extent me;
236 struct file *donor_filp;
237 int err;
238
239 if (!(filp->f_mode & FMODE_READ) ||
240 !(filp->f_mode & FMODE_WRITE))
241 return -EBADF;
242
243 if (copy_from_user(&me,
244 (struct move_extent __user *)arg, sizeof(me)))
245 return -EFAULT;
246 me.moved_len = 0;
247
248 donor_filp = fget(me.donor_fd);
249 if (!donor_filp)
250 return -EBADF;
251
252 if (!(donor_filp->f_mode & FMODE_WRITE)) {
253 err = -EBADF;
254 goto mext_out;
255 }
256
257 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
258 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
259 ext4_msg(sb, KERN_ERR,
260 "Online defrag not supported with bigalloc");
261 return -EOPNOTSUPP;
262 }
263
264 err = mnt_want_write_file(filp);
265 if (err)
266 goto mext_out;
267
268 err = ext4_move_extents(filp, donor_filp, me.orig_start,
269 me.donor_start, me.len, &me.moved_len);
270 mnt_drop_write_file(filp);
271
272 if (copy_to_user((struct move_extent __user *)arg,
273 &me, sizeof(me)))
274 err = -EFAULT;
275mext_out:
276 fput(donor_filp);
277 return err;
278 }
279
280 case EXT4_IOC_GROUP_ADD: {
281 struct ext4_new_group_data input;
282 int err, err2=0;
283
284 err = ext4_resize_begin(sb);
285 if (err)
286 return err;
287
288 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
289 sizeof(input))) {
290 err = -EFAULT;
291 goto group_add_out;
292 }
293
294 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
295 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
296 ext4_msg(sb, KERN_ERR,
297 "Online resizing not supported with bigalloc");
298 err = -EOPNOTSUPP;
299 goto group_add_out;
300 }
301
302 err = mnt_want_write_file(filp);
303 if (err)
304 goto group_add_out;
305
306 err = ext4_group_add(sb, &input);
307 if (EXT4_SB(sb)->s_journal) {
308 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
309 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
310 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
311 }
312 if (err == 0)
313 err = err2;
314 mnt_drop_write_file(filp);
315group_add_out:
316 ext4_resize_end(sb);
317 return err;
318 }
319
320 case EXT4_IOC_MIGRATE:
321 {
322 int err;
323 if (!inode_owner_or_capable(inode))
324 return -EACCES;
325
326 err = mnt_want_write_file(filp);
327 if (err)
328 return err;
329 /*
330 * inode_mutex prevent write and truncate on the file.
331 * Read still goes through. We take i_data_sem in
332 * ext4_ext_swap_inode_data before we switch the
333 * inode format to prevent read.
334 */
335 mutex_lock(&(inode->i_mutex));
336 err = ext4_ext_migrate(inode);
337 mutex_unlock(&(inode->i_mutex));
338 mnt_drop_write_file(filp);
339 return err;
340 }
341
342 case EXT4_IOC_ALLOC_DA_BLKS:
343 {
344 int err;
345 if (!inode_owner_or_capable(inode))
346 return -EACCES;
347
348 err = mnt_want_write_file(filp);
349 if (err)
350 return err;
351 err = ext4_alloc_da_blocks(inode);
352 mnt_drop_write_file(filp);
353 return err;
354 }
355
356 case EXT4_IOC_RESIZE_FS: {
357 ext4_fsblk_t n_blocks_count;
358 struct super_block *sb = inode->i_sb;
359 int err = 0, err2 = 0;
360
361 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
362 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
363 ext4_msg(sb, KERN_ERR,
364 "Online resizing not (yet) supported with bigalloc");
365 return -EOPNOTSUPP;
366 }
367
368 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
369 EXT4_FEATURE_INCOMPAT_META_BG)) {
370 ext4_msg(sb, KERN_ERR,
371 "Online resizing not (yet) supported with meta_bg");
372 return -EOPNOTSUPP;
373 }
374
375 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
376 sizeof(__u64))) {
377 return -EFAULT;
378 }
379
380 if (n_blocks_count > MAX_32_NUM &&
381 !EXT4_HAS_INCOMPAT_FEATURE(sb,
382 EXT4_FEATURE_INCOMPAT_64BIT)) {
383 ext4_msg(sb, KERN_ERR,
384 "File system only supports 32-bit block numbers");
385 return -EOPNOTSUPP;
386 }
387
388 err = ext4_resize_begin(sb);
389 if (err)
390 return err;
391
392 err = mnt_want_write(filp->f_path.mnt);
393 if (err)
394 goto resizefs_out;
395
396 err = ext4_resize_fs(sb, n_blocks_count);
397 if (EXT4_SB(sb)->s_journal) {
398 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
399 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
400 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
401 }
402 if (err == 0)
403 err = err2;
404 mnt_drop_write(filp->f_path.mnt);
405resizefs_out:
406 ext4_resize_end(sb);
407 return err;
408 }
409
410 case FITRIM:
411 {
412 struct request_queue *q = bdev_get_queue(sb->s_bdev);
413 struct fstrim_range range;
414 int ret = 0;
415
416 if (!capable(CAP_SYS_ADMIN))
417 return -EPERM;
418
419 if (!blk_queue_discard(q))
420 return -EOPNOTSUPP;
421
422 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
423 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
424 ext4_msg(sb, KERN_ERR,
425 "FITRIM not supported with bigalloc");
426 return -EOPNOTSUPP;
427 }
428
429 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
430 sizeof(range)))
431 return -EFAULT;
432
433 range.minlen = max((unsigned int)range.minlen,
434 q->limits.discard_granularity);
435 ret = ext4_trim_fs(sb, &range);
436 if (ret < 0)
437 return ret;
438
439 if (copy_to_user((struct fstrim_range __user *)arg, &range,
440 sizeof(range)))
441 return -EFAULT;
442
443 return 0;
444 }
445
446 default:
447 return -ENOTTY;
448 }
449}
450
451#ifdef CONFIG_COMPAT
452long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
453{
454 /* These are just misnamed, they actually get/put from/to user an int */
455 switch (cmd) {
456 case EXT4_IOC32_GETFLAGS:
457 cmd = EXT4_IOC_GETFLAGS;
458 break;
459 case EXT4_IOC32_SETFLAGS:
460 cmd = EXT4_IOC_SETFLAGS;
461 break;
462 case EXT4_IOC32_GETVERSION:
463 cmd = EXT4_IOC_GETVERSION;
464 break;
465 case EXT4_IOC32_SETVERSION:
466 cmd = EXT4_IOC_SETVERSION;
467 break;
468 case EXT4_IOC32_GROUP_EXTEND:
469 cmd = EXT4_IOC_GROUP_EXTEND;
470 break;
471 case EXT4_IOC32_GETVERSION_OLD:
472 cmd = EXT4_IOC_GETVERSION_OLD;
473 break;
474 case EXT4_IOC32_SETVERSION_OLD:
475 cmd = EXT4_IOC_SETVERSION_OLD;
476 break;
477 case EXT4_IOC32_GETRSVSZ:
478 cmd = EXT4_IOC_GETRSVSZ;
479 break;
480 case EXT4_IOC32_SETRSVSZ:
481 cmd = EXT4_IOC_SETRSVSZ;
482 break;
483 case EXT4_IOC32_GROUP_ADD: {
484 struct compat_ext4_new_group_input __user *uinput;
485 struct ext4_new_group_input input;
486 mm_segment_t old_fs;
487 int err;
488
489 uinput = compat_ptr(arg);
490 err = get_user(input.group, &uinput->group);
491 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
492 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
493 err |= get_user(input.inode_table, &uinput->inode_table);
494 err |= get_user(input.blocks_count, &uinput->blocks_count);
495 err |= get_user(input.reserved_blocks,
496 &uinput->reserved_blocks);
497 if (err)
498 return -EFAULT;
499 old_fs = get_fs();
500 set_fs(KERNEL_DS);
501 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
502 (unsigned long) &input);
503 set_fs(old_fs);
504 return err;
505 }
506 case EXT4_IOC_MOVE_EXT:
507 case FITRIM:
508 case EXT4_IOC_RESIZE_FS:
509 break;
510 default:
511 return -ENOIOCTLCMD;
512 }
513 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
514}
515#endif
1/*
2 * linux/fs/ext4/ioctl.c
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>
11#include <linux/jbd2.h>
12#include <linux/capability.h>
13#include <linux/time.h>
14#include <linux/compat.h>
15#include <linux/mount.h>
16#include <linux/file.h>
17#include <asm/uaccess.h>
18#include "ext4_jbd2.h"
19#include "ext4.h"
20
21#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
22
23/**
24 * Swap memory between @a and @b for @len bytes.
25 *
26 * @a: pointer to first memory area
27 * @b: pointer to second memory area
28 * @len: number of bytes to swap
29 *
30 */
31static void memswap(void *a, void *b, size_t len)
32{
33 unsigned char *ap, *bp;
34 unsigned char tmp;
35
36 ap = (unsigned char *)a;
37 bp = (unsigned char *)b;
38 while (len-- > 0) {
39 tmp = *ap;
40 *ap = *bp;
41 *bp = tmp;
42 ap++;
43 bp++;
44 }
45}
46
47/**
48 * Swap i_data and associated attributes between @inode1 and @inode2.
49 * This function is used for the primary swap between inode1 and inode2
50 * and also to revert this primary swap in case of errors.
51 *
52 * Therefore you have to make sure, that calling this method twice
53 * will revert all changes.
54 *
55 * @inode1: pointer to first inode
56 * @inode2: pointer to second inode
57 */
58static void swap_inode_data(struct inode *inode1, struct inode *inode2)
59{
60 loff_t isize;
61 struct ext4_inode_info *ei1;
62 struct ext4_inode_info *ei2;
63
64 ei1 = EXT4_I(inode1);
65 ei2 = EXT4_I(inode2);
66
67 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
68 memswap(&inode1->i_version, &inode2->i_version,
69 sizeof(inode1->i_version));
70 memswap(&inode1->i_blocks, &inode2->i_blocks,
71 sizeof(inode1->i_blocks));
72 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
73 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
74 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
75
76 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
77 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
78 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
79 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
80 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
81 ext4_es_lru_del(inode1);
82 ext4_es_lru_del(inode2);
83
84 isize = i_size_read(inode1);
85 i_size_write(inode1, i_size_read(inode2));
86 i_size_write(inode2, isize);
87}
88
89/**
90 * Swap the information from the given @inode and the inode
91 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
92 * important fields of the inodes.
93 *
94 * @sb: the super block of the filesystem
95 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
96 *
97 */
98static long swap_inode_boot_loader(struct super_block *sb,
99 struct inode *inode)
100{
101 handle_t *handle;
102 int err;
103 struct inode *inode_bl;
104 struct ext4_inode_info *ei_bl;
105 struct ext4_sb_info *sbi = EXT4_SB(sb);
106
107 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
108 return -EINVAL;
109
110 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
111 return -EPERM;
112
113 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
114 if (IS_ERR(inode_bl))
115 return PTR_ERR(inode_bl);
116 ei_bl = EXT4_I(inode_bl);
117
118 filemap_flush(inode->i_mapping);
119 filemap_flush(inode_bl->i_mapping);
120
121 /* Protect orig inodes against a truncate and make sure,
122 * that only 1 swap_inode_boot_loader is running. */
123 lock_two_nondirectories(inode, inode_bl);
124
125 truncate_inode_pages(&inode->i_data, 0);
126 truncate_inode_pages(&inode_bl->i_data, 0);
127
128 /* Wait for all existing dio workers */
129 ext4_inode_block_unlocked_dio(inode);
130 ext4_inode_block_unlocked_dio(inode_bl);
131 inode_dio_wait(inode);
132 inode_dio_wait(inode_bl);
133
134 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
135 if (IS_ERR(handle)) {
136 err = -EINVAL;
137 goto journal_err_out;
138 }
139
140 /* Protect extent tree against block allocations via delalloc */
141 ext4_double_down_write_data_sem(inode, inode_bl);
142
143 if (inode_bl->i_nlink == 0) {
144 /* this inode has never been used as a BOOT_LOADER */
145 set_nlink(inode_bl, 1);
146 i_uid_write(inode_bl, 0);
147 i_gid_write(inode_bl, 0);
148 inode_bl->i_flags = 0;
149 ei_bl->i_flags = 0;
150 inode_bl->i_version = 1;
151 i_size_write(inode_bl, 0);
152 inode_bl->i_mode = S_IFREG;
153 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
154 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
155 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
156 ext4_ext_tree_init(handle, inode_bl);
157 } else
158 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
159 }
160
161 swap_inode_data(inode, inode_bl);
162
163 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
164
165 spin_lock(&sbi->s_next_gen_lock);
166 inode->i_generation = sbi->s_next_generation++;
167 inode_bl->i_generation = sbi->s_next_generation++;
168 spin_unlock(&sbi->s_next_gen_lock);
169
170 ext4_discard_preallocations(inode);
171
172 err = ext4_mark_inode_dirty(handle, inode);
173 if (err < 0) {
174 ext4_warning(inode->i_sb,
175 "couldn't mark inode #%lu dirty (err %d)",
176 inode->i_ino, err);
177 /* Revert all changes: */
178 swap_inode_data(inode, inode_bl);
179 } else {
180 err = ext4_mark_inode_dirty(handle, inode_bl);
181 if (err < 0) {
182 ext4_warning(inode_bl->i_sb,
183 "couldn't mark inode #%lu dirty (err %d)",
184 inode_bl->i_ino, err);
185 /* Revert all changes: */
186 swap_inode_data(inode, inode_bl);
187 ext4_mark_inode_dirty(handle, inode);
188 }
189 }
190 ext4_journal_stop(handle);
191 ext4_double_up_write_data_sem(inode, inode_bl);
192
193journal_err_out:
194 ext4_inode_resume_unlocked_dio(inode);
195 ext4_inode_resume_unlocked_dio(inode_bl);
196 unlock_two_nondirectories(inode, inode_bl);
197 iput(inode_bl);
198 return err;
199}
200
201long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
202{
203 struct inode *inode = file_inode(filp);
204 struct super_block *sb = inode->i_sb;
205 struct ext4_inode_info *ei = EXT4_I(inode);
206 unsigned int flags;
207
208 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
209
210 switch (cmd) {
211 case EXT4_IOC_GETFLAGS:
212 ext4_get_inode_flags(ei);
213 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
214 return put_user(flags, (int __user *) arg);
215 case EXT4_IOC_SETFLAGS: {
216 handle_t *handle = NULL;
217 int err, migrate = 0;
218 struct ext4_iloc iloc;
219 unsigned int oldflags, mask, i;
220 unsigned int jflag;
221
222 if (!inode_owner_or_capable(inode))
223 return -EACCES;
224
225 if (get_user(flags, (int __user *) arg))
226 return -EFAULT;
227
228 err = mnt_want_write_file(filp);
229 if (err)
230 return err;
231
232 flags = ext4_mask_flags(inode->i_mode, flags);
233
234 err = -EPERM;
235 mutex_lock(&inode->i_mutex);
236 /* Is it quota file? Do not allow user to mess with it */
237 if (IS_NOQUOTA(inode))
238 goto flags_out;
239
240 oldflags = ei->i_flags;
241
242 /* The JOURNAL_DATA flag is modifiable only by root */
243 jflag = flags & EXT4_JOURNAL_DATA_FL;
244
245 /*
246 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
247 * the relevant capability.
248 *
249 * This test looks nicer. Thanks to Pauline Middelink
250 */
251 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
252 if (!capable(CAP_LINUX_IMMUTABLE))
253 goto flags_out;
254 }
255
256 /*
257 * The JOURNAL_DATA flag can only be changed by
258 * the relevant capability.
259 */
260 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
261 if (!capable(CAP_SYS_RESOURCE))
262 goto flags_out;
263 }
264 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
265 migrate = 1;
266
267 if (flags & EXT4_EOFBLOCKS_FL) {
268 /* we don't support adding EOFBLOCKS flag */
269 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
270 err = -EOPNOTSUPP;
271 goto flags_out;
272 }
273 } else if (oldflags & EXT4_EOFBLOCKS_FL)
274 ext4_truncate(inode);
275
276 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
277 if (IS_ERR(handle)) {
278 err = PTR_ERR(handle);
279 goto flags_out;
280 }
281 if (IS_SYNC(inode))
282 ext4_handle_sync(handle);
283 err = ext4_reserve_inode_write(handle, inode, &iloc);
284 if (err)
285 goto flags_err;
286
287 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
288 if (!(mask & EXT4_FL_USER_MODIFIABLE))
289 continue;
290 if (mask & flags)
291 ext4_set_inode_flag(inode, i);
292 else
293 ext4_clear_inode_flag(inode, i);
294 }
295
296 ext4_set_inode_flags(inode);
297 inode->i_ctime = ext4_current_time(inode);
298
299 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
300flags_err:
301 ext4_journal_stop(handle);
302 if (err)
303 goto flags_out;
304
305 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
306 err = ext4_change_inode_journal_flag(inode, jflag);
307 if (err)
308 goto flags_out;
309 if (migrate) {
310 if (flags & EXT4_EXTENTS_FL)
311 err = ext4_ext_migrate(inode);
312 else
313 err = ext4_ind_migrate(inode);
314 }
315
316flags_out:
317 mutex_unlock(&inode->i_mutex);
318 mnt_drop_write_file(filp);
319 return err;
320 }
321 case EXT4_IOC_GETVERSION:
322 case EXT4_IOC_GETVERSION_OLD:
323 return put_user(inode->i_generation, (int __user *) arg);
324 case EXT4_IOC_SETVERSION:
325 case EXT4_IOC_SETVERSION_OLD: {
326 handle_t *handle;
327 struct ext4_iloc iloc;
328 __u32 generation;
329 int err;
330
331 if (!inode_owner_or_capable(inode))
332 return -EPERM;
333
334 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
335 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
336 ext4_warning(sb, "Setting inode version is not "
337 "supported with metadata_csum enabled.");
338 return -ENOTTY;
339 }
340
341 err = mnt_want_write_file(filp);
342 if (err)
343 return err;
344 if (get_user(generation, (int __user *) arg)) {
345 err = -EFAULT;
346 goto setversion_out;
347 }
348
349 mutex_lock(&inode->i_mutex);
350 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
351 if (IS_ERR(handle)) {
352 err = PTR_ERR(handle);
353 goto unlock_out;
354 }
355 err = ext4_reserve_inode_write(handle, inode, &iloc);
356 if (err == 0) {
357 inode->i_ctime = ext4_current_time(inode);
358 inode->i_generation = generation;
359 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
360 }
361 ext4_journal_stop(handle);
362
363unlock_out:
364 mutex_unlock(&inode->i_mutex);
365setversion_out:
366 mnt_drop_write_file(filp);
367 return err;
368 }
369 case EXT4_IOC_GROUP_EXTEND: {
370 ext4_fsblk_t n_blocks_count;
371 int err, err2=0;
372
373 err = ext4_resize_begin(sb);
374 if (err)
375 return err;
376
377 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
378 err = -EFAULT;
379 goto group_extend_out;
380 }
381
382 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
383 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
384 ext4_msg(sb, KERN_ERR,
385 "Online resizing not supported with bigalloc");
386 err = -EOPNOTSUPP;
387 goto group_extend_out;
388 }
389
390 err = mnt_want_write_file(filp);
391 if (err)
392 goto group_extend_out;
393
394 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
395 if (EXT4_SB(sb)->s_journal) {
396 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
397 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
398 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
399 }
400 if (err == 0)
401 err = err2;
402 mnt_drop_write_file(filp);
403group_extend_out:
404 ext4_resize_end(sb);
405 return err;
406 }
407
408 case EXT4_IOC_MOVE_EXT: {
409 struct move_extent me;
410 struct fd donor;
411 int err;
412
413 if (!(filp->f_mode & FMODE_READ) ||
414 !(filp->f_mode & FMODE_WRITE))
415 return -EBADF;
416
417 if (copy_from_user(&me,
418 (struct move_extent __user *)arg, sizeof(me)))
419 return -EFAULT;
420 me.moved_len = 0;
421
422 donor = fdget(me.donor_fd);
423 if (!donor.file)
424 return -EBADF;
425
426 if (!(donor.file->f_mode & FMODE_WRITE)) {
427 err = -EBADF;
428 goto mext_out;
429 }
430
431 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
432 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
433 ext4_msg(sb, KERN_ERR,
434 "Online defrag not supported with bigalloc");
435 err = -EOPNOTSUPP;
436 goto mext_out;
437 }
438
439 err = mnt_want_write_file(filp);
440 if (err)
441 goto mext_out;
442
443 err = ext4_move_extents(filp, donor.file, me.orig_start,
444 me.donor_start, me.len, &me.moved_len);
445 mnt_drop_write_file(filp);
446
447 if (copy_to_user((struct move_extent __user *)arg,
448 &me, sizeof(me)))
449 err = -EFAULT;
450mext_out:
451 fdput(donor);
452 return err;
453 }
454
455 case EXT4_IOC_GROUP_ADD: {
456 struct ext4_new_group_data input;
457 int err, err2=0;
458
459 err = ext4_resize_begin(sb);
460 if (err)
461 return err;
462
463 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
464 sizeof(input))) {
465 err = -EFAULT;
466 goto group_add_out;
467 }
468
469 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
470 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
471 ext4_msg(sb, KERN_ERR,
472 "Online resizing not supported with bigalloc");
473 err = -EOPNOTSUPP;
474 goto group_add_out;
475 }
476
477 err = mnt_want_write_file(filp);
478 if (err)
479 goto group_add_out;
480
481 err = ext4_group_add(sb, &input);
482 if (EXT4_SB(sb)->s_journal) {
483 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
484 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
485 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
486 }
487 if (err == 0)
488 err = err2;
489 mnt_drop_write_file(filp);
490 if (!err && ext4_has_group_desc_csum(sb) &&
491 test_opt(sb, INIT_INODE_TABLE))
492 err = ext4_register_li_request(sb, input.group);
493group_add_out:
494 ext4_resize_end(sb);
495 return err;
496 }
497
498 case EXT4_IOC_MIGRATE:
499 {
500 int err;
501 if (!inode_owner_or_capable(inode))
502 return -EACCES;
503
504 err = mnt_want_write_file(filp);
505 if (err)
506 return err;
507 /*
508 * inode_mutex prevent write and truncate on the file.
509 * Read still goes through. We take i_data_sem in
510 * ext4_ext_swap_inode_data before we switch the
511 * inode format to prevent read.
512 */
513 mutex_lock(&(inode->i_mutex));
514 err = ext4_ext_migrate(inode);
515 mutex_unlock(&(inode->i_mutex));
516 mnt_drop_write_file(filp);
517 return err;
518 }
519
520 case EXT4_IOC_ALLOC_DA_BLKS:
521 {
522 int err;
523 if (!inode_owner_or_capable(inode))
524 return -EACCES;
525
526 err = mnt_want_write_file(filp);
527 if (err)
528 return err;
529 err = ext4_alloc_da_blocks(inode);
530 mnt_drop_write_file(filp);
531 return err;
532 }
533
534 case EXT4_IOC_SWAP_BOOT:
535 if (!(filp->f_mode & FMODE_WRITE))
536 return -EBADF;
537 return swap_inode_boot_loader(sb, inode);
538
539 case EXT4_IOC_RESIZE_FS: {
540 ext4_fsblk_t n_blocks_count;
541 int err = 0, err2 = 0;
542 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
543
544 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
545 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
546 ext4_msg(sb, KERN_ERR,
547 "Online resizing not (yet) supported with bigalloc");
548 return -EOPNOTSUPP;
549 }
550
551 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
552 sizeof(__u64))) {
553 return -EFAULT;
554 }
555
556 err = ext4_resize_begin(sb);
557 if (err)
558 return err;
559
560 err = mnt_want_write_file(filp);
561 if (err)
562 goto resizefs_out;
563
564 err = ext4_resize_fs(sb, n_blocks_count);
565 if (EXT4_SB(sb)->s_journal) {
566 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
567 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
568 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
569 }
570 if (err == 0)
571 err = err2;
572 mnt_drop_write_file(filp);
573 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
574 ext4_has_group_desc_csum(sb) &&
575 test_opt(sb, INIT_INODE_TABLE))
576 err = ext4_register_li_request(sb, o_group);
577
578resizefs_out:
579 ext4_resize_end(sb);
580 return err;
581 }
582
583 case FITRIM:
584 {
585 struct request_queue *q = bdev_get_queue(sb->s_bdev);
586 struct fstrim_range range;
587 int ret = 0;
588
589 if (!capable(CAP_SYS_ADMIN))
590 return -EPERM;
591
592 if (!blk_queue_discard(q))
593 return -EOPNOTSUPP;
594
595 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
596 sizeof(range)))
597 return -EFAULT;
598
599 range.minlen = max((unsigned int)range.minlen,
600 q->limits.discard_granularity);
601 ret = ext4_trim_fs(sb, &range);
602 if (ret < 0)
603 return ret;
604
605 if (copy_to_user((struct fstrim_range __user *)arg, &range,
606 sizeof(range)))
607 return -EFAULT;
608
609 return 0;
610 }
611 case EXT4_IOC_PRECACHE_EXTENTS:
612 return ext4_ext_precache(inode);
613
614 default:
615 return -ENOTTY;
616 }
617}
618
619#ifdef CONFIG_COMPAT
620long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
621{
622 /* These are just misnamed, they actually get/put from/to user an int */
623 switch (cmd) {
624 case EXT4_IOC32_GETFLAGS:
625 cmd = EXT4_IOC_GETFLAGS;
626 break;
627 case EXT4_IOC32_SETFLAGS:
628 cmd = EXT4_IOC_SETFLAGS;
629 break;
630 case EXT4_IOC32_GETVERSION:
631 cmd = EXT4_IOC_GETVERSION;
632 break;
633 case EXT4_IOC32_SETVERSION:
634 cmd = EXT4_IOC_SETVERSION;
635 break;
636 case EXT4_IOC32_GROUP_EXTEND:
637 cmd = EXT4_IOC_GROUP_EXTEND;
638 break;
639 case EXT4_IOC32_GETVERSION_OLD:
640 cmd = EXT4_IOC_GETVERSION_OLD;
641 break;
642 case EXT4_IOC32_SETVERSION_OLD:
643 cmd = EXT4_IOC_SETVERSION_OLD;
644 break;
645 case EXT4_IOC32_GETRSVSZ:
646 cmd = EXT4_IOC_GETRSVSZ;
647 break;
648 case EXT4_IOC32_SETRSVSZ:
649 cmd = EXT4_IOC_SETRSVSZ;
650 break;
651 case EXT4_IOC32_GROUP_ADD: {
652 struct compat_ext4_new_group_input __user *uinput;
653 struct ext4_new_group_input input;
654 mm_segment_t old_fs;
655 int err;
656
657 uinput = compat_ptr(arg);
658 err = get_user(input.group, &uinput->group);
659 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
660 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
661 err |= get_user(input.inode_table, &uinput->inode_table);
662 err |= get_user(input.blocks_count, &uinput->blocks_count);
663 err |= get_user(input.reserved_blocks,
664 &uinput->reserved_blocks);
665 if (err)
666 return -EFAULT;
667 old_fs = get_fs();
668 set_fs(KERNEL_DS);
669 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
670 (unsigned long) &input);
671 set_fs(old_fs);
672 return err;
673 }
674 case EXT4_IOC_MOVE_EXT:
675 case FITRIM:
676 case EXT4_IOC_RESIZE_FS:
677 case EXT4_IOC_PRECACHE_EXTENTS:
678 break;
679 default:
680 return -ENOIOCTLCMD;
681 }
682 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
683}
684#endif