Commit | Line | Data |
---|---|---|
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> | |
dab291af | 11 | #include <linux/jbd2.h> |
ac27a0ec | 12 | #include <linux/capability.h> |
ac27a0ec DK |
13 | #include <linux/time.h> |
14 | #include <linux/compat.h> | |
42a74f20 | 15 | #include <linux/mount.h> |
748de673 | 16 | #include <linux/file.h> |
ac27a0ec | 17 | #include <asm/uaccess.h> |
3dcf5451 CH |
18 | #include "ext4_jbd2.h" |
19 | #include "ext4.h" | |
ac27a0ec | 20 | |
5cdd7b2d | 21 | long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
ac27a0ec | 22 | { |
5cdd7b2d | 23 | struct inode *inode = filp->f_dentry->d_inode; |
bab08ab9 | 24 | struct super_block *sb = inode->i_sb; |
617ba13b | 25 | struct ext4_inode_info *ei = EXT4_I(inode); |
ac27a0ec | 26 | unsigned int flags; |
ac27a0ec | 27 | |
af5bc92d | 28 | ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); |
ac27a0ec DK |
29 | |
30 | switch (cmd) { | |
617ba13b | 31 | case EXT4_IOC_GETFLAGS: |
ff9ddf7e | 32 | ext4_get_inode_flags(ei); |
617ba13b | 33 | flags = ei->i_flags & EXT4_FL_USER_VISIBLE; |
ac27a0ec | 34 | return put_user(flags, (int __user *) arg); |
617ba13b | 35 | case EXT4_IOC_SETFLAGS: { |
ac27a0ec | 36 | handle_t *handle = NULL; |
4db46fc2 | 37 | int err, migrate = 0; |
617ba13b | 38 | struct ext4_iloc iloc; |
ac27a0ec DK |
39 | unsigned int oldflags; |
40 | unsigned int jflag; | |
41 | ||
2e149670 | 42 | if (!inode_owner_or_capable(inode)) |
ac27a0ec DK |
43 | return -EACCES; |
44 | ||
45 | if (get_user(flags, (int __user *) arg)) | |
46 | return -EFAULT; | |
47 | ||
42a74f20 DH |
48 | err = mnt_want_write(filp->f_path.mnt); |
49 | if (err) | |
50 | return err; | |
51 | ||
2dc6b0d4 | 52 | flags = ext4_mask_flags(inode->i_mode, flags); |
ac27a0ec | 53 | |
42a74f20 | 54 | err = -EPERM; |
ac27a0ec | 55 | mutex_lock(&inode->i_mutex); |
e47776a0 | 56 | /* Is it quota file? Do not allow user to mess with it */ |
42a74f20 DH |
57 | if (IS_NOQUOTA(inode)) |
58 | goto flags_out; | |
59 | ||
ac27a0ec DK |
60 | oldflags = ei->i_flags; |
61 | ||
62 | /* The JOURNAL_DATA flag is modifiable only by root */ | |
617ba13b | 63 | jflag = flags & EXT4_JOURNAL_DATA_FL; |
ac27a0ec DK |
64 | |
65 | /* | |
66 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
67 | * the relevant capability. | |
68 | * | |
69 | * This test looks nicer. Thanks to Pauline Middelink | |
70 | */ | |
617ba13b | 71 | if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { |
42a74f20 DH |
72 | if (!capable(CAP_LINUX_IMMUTABLE)) |
73 | goto flags_out; | |
ac27a0ec DK |
74 | } |
75 | ||
76 | /* | |
77 | * The JOURNAL_DATA flag can only be changed by | |
78 | * the relevant capability. | |
79 | */ | |
617ba13b | 80 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { |
42a74f20 DH |
81 | if (!capable(CAP_SYS_RESOURCE)) |
82 | goto flags_out; | |
ac27a0ec | 83 | } |
4db46fc2 AK |
84 | if (oldflags & EXT4_EXTENTS_FL) { |
85 | /* We don't support clearning extent flags */ | |
86 | if (!(flags & EXT4_EXTENTS_FL)) { | |
87 | err = -EOPNOTSUPP; | |
88 | goto flags_out; | |
89 | } | |
90 | } else if (flags & EXT4_EXTENTS_FL) { | |
91 | /* migrate the file */ | |
92 | migrate = 1; | |
93 | flags &= ~EXT4_EXTENTS_FL; | |
94 | } | |
ac27a0ec | 95 | |
c8d46e41 JZ |
96 | if (flags & EXT4_EOFBLOCKS_FL) { |
97 | /* we don't support adding EOFBLOCKS flag */ | |
98 | if (!(oldflags & EXT4_EOFBLOCKS_FL)) { | |
99 | err = -EOPNOTSUPP; | |
100 | goto flags_out; | |
101 | } | |
102 | } else if (oldflags & EXT4_EOFBLOCKS_FL) | |
103 | ext4_truncate(inode); | |
104 | ||
617ba13b | 105 | handle = ext4_journal_start(inode, 1); |
ac27a0ec | 106 | if (IS_ERR(handle)) { |
42a74f20 DH |
107 | err = PTR_ERR(handle); |
108 | goto flags_out; | |
ac27a0ec DK |
109 | } |
110 | if (IS_SYNC(inode)) | |
0390131b | 111 | ext4_handle_sync(handle); |
617ba13b | 112 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec DK |
113 | if (err) |
114 | goto flags_err; | |
115 | ||
617ba13b MC |
116 | flags = flags & EXT4_FL_USER_MODIFIABLE; |
117 | flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; | |
ac27a0ec DK |
118 | ei->i_flags = flags; |
119 | ||
617ba13b | 120 | ext4_set_inode_flags(inode); |
ef7f3835 | 121 | inode->i_ctime = ext4_current_time(inode); |
ac27a0ec | 122 | |
617ba13b | 123 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 124 | flags_err: |
617ba13b | 125 | ext4_journal_stop(handle); |
42a74f20 DH |
126 | if (err) |
127 | goto flags_out; | |
ac27a0ec | 128 | |
617ba13b MC |
129 | if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) |
130 | err = ext4_change_inode_journal_flag(inode, jflag); | |
4db46fc2 AK |
131 | if (err) |
132 | goto flags_out; | |
133 | if (migrate) | |
134 | err = ext4_ext_migrate(inode); | |
42a74f20 | 135 | flags_out: |
ac27a0ec | 136 | mutex_unlock(&inode->i_mutex); |
42a74f20 | 137 | mnt_drop_write(filp->f_path.mnt); |
ac27a0ec DK |
138 | return err; |
139 | } | |
617ba13b MC |
140 | case EXT4_IOC_GETVERSION: |
141 | case EXT4_IOC_GETVERSION_OLD: | |
ac27a0ec | 142 | return put_user(inode->i_generation, (int __user *) arg); |
617ba13b MC |
143 | case EXT4_IOC_SETVERSION: |
144 | case EXT4_IOC_SETVERSION_OLD: { | |
ac27a0ec | 145 | handle_t *handle; |
617ba13b | 146 | struct ext4_iloc iloc; |
ac27a0ec DK |
147 | __u32 generation; |
148 | int err; | |
149 | ||
2e149670 | 150 | if (!inode_owner_or_capable(inode)) |
ac27a0ec | 151 | return -EPERM; |
42a74f20 DH |
152 | |
153 | err = mnt_want_write(filp->f_path.mnt); | |
154 | if (err) | |
155 | return err; | |
156 | if (get_user(generation, (int __user *) arg)) { | |
157 | err = -EFAULT; | |
158 | goto setversion_out; | |
159 | } | |
ac27a0ec | 160 | |
617ba13b | 161 | handle = ext4_journal_start(inode, 1); |
42a74f20 DH |
162 | if (IS_ERR(handle)) { |
163 | err = PTR_ERR(handle); | |
164 | goto setversion_out; | |
165 | } | |
617ba13b | 166 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
ac27a0ec | 167 | if (err == 0) { |
ef7f3835 | 168 | inode->i_ctime = ext4_current_time(inode); |
ac27a0ec | 169 | inode->i_generation = generation; |
617ba13b | 170 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec | 171 | } |
617ba13b | 172 | ext4_journal_stop(handle); |
42a74f20 DH |
173 | setversion_out: |
174 | mnt_drop_write(filp->f_path.mnt); | |
ac27a0ec DK |
175 | return err; |
176 | } | |
617ba13b MC |
177 | case EXT4_IOC_GROUP_EXTEND: { |
178 | ext4_fsblk_t n_blocks_count; | |
ac046f1d | 179 | int err, err2=0; |
ac27a0ec | 180 | |
8f82f840 YY |
181 | err = ext4_resize_begin(sb); |
182 | if (err) | |
183 | return err; | |
ac27a0ec | 184 | |
ac27a0ec DK |
185 | if (get_user(n_blocks_count, (__u32 __user *)arg)) |
186 | return -EFAULT; | |
187 | ||
bab08ab9 TT |
188 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
189 | EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { | |
190 | ext4_msg(sb, KERN_ERR, | |
191 | "Online resizing not supported with bigalloc"); | |
192 | return -EOPNOTSUPP; | |
193 | } | |
194 | ||
42a74f20 DH |
195 | err = mnt_want_write(filp->f_path.mnt); |
196 | if (err) | |
197 | return err; | |
198 | ||
617ba13b | 199 | err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); |
ac046f1d PT |
200 | if (EXT4_SB(sb)->s_journal) { |
201 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); | |
202 | err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
203 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
204 | } | |
7ffe1ea8 HK |
205 | if (err == 0) |
206 | err = err2; | |
42a74f20 | 207 | mnt_drop_write(filp->f_path.mnt); |
8f82f840 | 208 | ext4_resize_end(sb); |
ac27a0ec DK |
209 | |
210 | return err; | |
211 | } | |
748de673 AF |
212 | |
213 | case EXT4_IOC_MOVE_EXT: { | |
214 | struct move_extent me; | |
215 | struct file *donor_filp; | |
216 | int err; | |
217 | ||
4a58579b AF |
218 | if (!(filp->f_mode & FMODE_READ) || |
219 | !(filp->f_mode & FMODE_WRITE)) | |
220 | return -EBADF; | |
221 | ||
748de673 AF |
222 | if (copy_from_user(&me, |
223 | (struct move_extent __user *)arg, sizeof(me))) | |
224 | return -EFAULT; | |
4a58579b | 225 | me.moved_len = 0; |
748de673 AF |
226 | |
227 | donor_filp = fget(me.donor_fd); | |
228 | if (!donor_filp) | |
229 | return -EBADF; | |
230 | ||
4a58579b AF |
231 | if (!(donor_filp->f_mode & FMODE_WRITE)) { |
232 | err = -EBADF; | |
233 | goto mext_out; | |
748de673 AF |
234 | } |
235 | ||
bab08ab9 TT |
236 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
237 | EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { | |
238 | ext4_msg(sb, KERN_ERR, | |
239 | "Online defrag not supported with bigalloc"); | |
240 | return -EOPNOTSUPP; | |
241 | } | |
242 | ||
4a58579b AF |
243 | err = mnt_want_write(filp->f_path.mnt); |
244 | if (err) | |
245 | goto mext_out; | |
246 | ||
748de673 AF |
247 | err = ext4_move_extents(filp, donor_filp, me.orig_start, |
248 | me.donor_start, me.len, &me.moved_len); | |
4a58579b AF |
249 | mnt_drop_write(filp->f_path.mnt); |
250 | if (me.moved_len > 0) | |
251 | file_remove_suid(donor_filp); | |
748de673 | 252 | |
60e6679e | 253 | if (copy_to_user((struct move_extent __user *)arg, |
c437b273 | 254 | &me, sizeof(me))) |
4a58579b AF |
255 | err = -EFAULT; |
256 | mext_out: | |
257 | fput(donor_filp); | |
748de673 AF |
258 | return err; |
259 | } | |
260 | ||
617ba13b MC |
261 | case EXT4_IOC_GROUP_ADD: { |
262 | struct ext4_new_group_data input; | |
ac046f1d | 263 | int err, err2=0; |
ac27a0ec | 264 | |
8f82f840 YY |
265 | err = ext4_resize_begin(sb); |
266 | if (err) | |
267 | return err; | |
ac27a0ec | 268 | |
617ba13b | 269 | if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, |
ac27a0ec DK |
270 | sizeof(input))) |
271 | return -EFAULT; | |
272 | ||
bab08ab9 TT |
273 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
274 | EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { | |
275 | ext4_msg(sb, KERN_ERR, | |
276 | "Online resizing not supported with bigalloc"); | |
277 | return -EOPNOTSUPP; | |
278 | } | |
279 | ||
42a74f20 DH |
280 | err = mnt_want_write(filp->f_path.mnt); |
281 | if (err) | |
282 | return err; | |
283 | ||
617ba13b | 284 | err = ext4_group_add(sb, &input); |
ac046f1d PT |
285 | if (EXT4_SB(sb)->s_journal) { |
286 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); | |
287 | err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
288 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
289 | } | |
7ffe1ea8 HK |
290 | if (err == 0) |
291 | err = err2; | |
42a74f20 | 292 | mnt_drop_write(filp->f_path.mnt); |
8f82f840 | 293 | ext4_resize_end(sb); |
ac27a0ec DK |
294 | |
295 | return err; | |
296 | } | |
297 | ||
c14c6fd5 | 298 | case EXT4_IOC_MIGRATE: |
2a43a878 AK |
299 | { |
300 | int err; | |
2e149670 | 301 | if (!inode_owner_or_capable(inode)) |
2a43a878 AK |
302 | return -EACCES; |
303 | ||
304 | err = mnt_want_write(filp->f_path.mnt); | |
305 | if (err) | |
306 | return err; | |
307 | /* | |
308 | * inode_mutex prevent write and truncate on the file. | |
309 | * Read still goes through. We take i_data_sem in | |
310 | * ext4_ext_swap_inode_data before we switch the | |
311 | * inode format to prevent read. | |
312 | */ | |
313 | mutex_lock(&(inode->i_mutex)); | |
314 | err = ext4_ext_migrate(inode); | |
315 | mutex_unlock(&(inode->i_mutex)); | |
316 | mnt_drop_write(filp->f_path.mnt); | |
317 | return err; | |
318 | } | |
c14c6fd5 | 319 | |
ccd2506b TT |
320 | case EXT4_IOC_ALLOC_DA_BLKS: |
321 | { | |
322 | int err; | |
2e149670 | 323 | if (!inode_owner_or_capable(inode)) |
ccd2506b TT |
324 | return -EACCES; |
325 | ||
326 | err = mnt_want_write(filp->f_path.mnt); | |
327 | if (err) | |
328 | return err; | |
329 | err = ext4_alloc_da_blocks(inode); | |
330 | mnt_drop_write(filp->f_path.mnt); | |
331 | return err; | |
332 | } | |
333 | ||
e681c047 LC |
334 | case FITRIM: |
335 | { | |
41431792 | 336 | struct request_queue *q = bdev_get_queue(sb->s_bdev); |
e681c047 LC |
337 | struct fstrim_range range; |
338 | int ret = 0; | |
339 | ||
340 | if (!capable(CAP_SYS_ADMIN)) | |
341 | return -EPERM; | |
342 | ||
41431792 LC |
343 | if (!blk_queue_discard(q)) |
344 | return -EOPNOTSUPP; | |
345 | ||
bab08ab9 TT |
346 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
347 | EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { | |
348 | ext4_msg(sb, KERN_ERR, | |
349 | "FITRIM not supported with bigalloc"); | |
350 | return -EOPNOTSUPP; | |
351 | } | |
352 | ||
e6705f7c | 353 | if (copy_from_user(&range, (struct fstrim_range __user *)arg, |
e681c047 LC |
354 | sizeof(range))) |
355 | return -EFAULT; | |
356 | ||
5c2ed62f LC |
357 | range.minlen = max((unsigned int)range.minlen, |
358 | q->limits.discard_granularity); | |
e681c047 LC |
359 | ret = ext4_trim_fs(sb, &range); |
360 | if (ret < 0) | |
361 | return ret; | |
362 | ||
e6705f7c | 363 | if (copy_to_user((struct fstrim_range __user *)arg, &range, |
e681c047 LC |
364 | sizeof(range))) |
365 | return -EFAULT; | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
ac27a0ec DK |
370 | default: |
371 | return -ENOTTY; | |
372 | } | |
373 | } | |
374 | ||
375 | #ifdef CONFIG_COMPAT | |
617ba13b | 376 | long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ac27a0ec | 377 | { |
ac27a0ec DK |
378 | /* These are just misnamed, they actually get/put from/to user an int */ |
379 | switch (cmd) { | |
617ba13b MC |
380 | case EXT4_IOC32_GETFLAGS: |
381 | cmd = EXT4_IOC_GETFLAGS; | |
ac27a0ec | 382 | break; |
617ba13b MC |
383 | case EXT4_IOC32_SETFLAGS: |
384 | cmd = EXT4_IOC_SETFLAGS; | |
ac27a0ec | 385 | break; |
617ba13b MC |
386 | case EXT4_IOC32_GETVERSION: |
387 | cmd = EXT4_IOC_GETVERSION; | |
ac27a0ec | 388 | break; |
617ba13b MC |
389 | case EXT4_IOC32_SETVERSION: |
390 | cmd = EXT4_IOC_SETVERSION; | |
ac27a0ec | 391 | break; |
617ba13b MC |
392 | case EXT4_IOC32_GROUP_EXTEND: |
393 | cmd = EXT4_IOC_GROUP_EXTEND; | |
ac27a0ec | 394 | break; |
617ba13b MC |
395 | case EXT4_IOC32_GETVERSION_OLD: |
396 | cmd = EXT4_IOC_GETVERSION_OLD; | |
ac27a0ec | 397 | break; |
617ba13b MC |
398 | case EXT4_IOC32_SETVERSION_OLD: |
399 | cmd = EXT4_IOC_SETVERSION_OLD; | |
ac27a0ec | 400 | break; |
617ba13b MC |
401 | case EXT4_IOC32_GETRSVSZ: |
402 | cmd = EXT4_IOC_GETRSVSZ; | |
ac27a0ec | 403 | break; |
617ba13b MC |
404 | case EXT4_IOC32_SETRSVSZ: |
405 | cmd = EXT4_IOC_SETRSVSZ; | |
ac27a0ec | 406 | break; |
4d92dc0f BH |
407 | case EXT4_IOC32_GROUP_ADD: { |
408 | struct compat_ext4_new_group_input __user *uinput; | |
409 | struct ext4_new_group_input input; | |
410 | mm_segment_t old_fs; | |
411 | int err; | |
412 | ||
413 | uinput = compat_ptr(arg); | |
414 | err = get_user(input.group, &uinput->group); | |
415 | err |= get_user(input.block_bitmap, &uinput->block_bitmap); | |
416 | err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); | |
417 | err |= get_user(input.inode_table, &uinput->inode_table); | |
418 | err |= get_user(input.blocks_count, &uinput->blocks_count); | |
419 | err |= get_user(input.reserved_blocks, | |
420 | &uinput->reserved_blocks); | |
421 | if (err) | |
422 | return -EFAULT; | |
423 | old_fs = get_fs(); | |
424 | set_fs(KERNEL_DS); | |
425 | err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, | |
426 | (unsigned long) &input); | |
427 | set_fs(old_fs); | |
428 | return err; | |
429 | } | |
b684b2ee | 430 | case EXT4_IOC_MOVE_EXT: |
a56e69c2 | 431 | case FITRIM: |
b684b2ee | 432 | break; |
ac27a0ec DK |
433 | default: |
434 | return -ENOIOCTLCMD; | |
435 | } | |
5cdd7b2d | 436 | return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
ac27a0ec DK |
437 | } |
438 | #endif |