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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
21long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
22{
23 struct inode *inode = filp->f_dentry->d_inode;
24 struct ext4_inode_info *ei = EXT4_I(inode);
25 unsigned int flags;
26
27 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
28
29 switch (cmd) {
30 case EXT4_IOC_GETFLAGS:
31 ext4_get_inode_flags(ei);
32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
33 return put_user(flags, (int __user *) arg);
34 case EXT4_IOC_SETFLAGS: {
35 handle_t *handle = NULL;
36 int err, migrate = 0;
37 struct ext4_iloc iloc;
38 unsigned int oldflags;
39 unsigned int jflag;
40
41 if (!inode_owner_or_capable(inode))
42 return -EACCES;
43
44 if (get_user(flags, (int __user *) arg))
45 return -EFAULT;
46
47 err = mnt_want_write(filp->f_path.mnt);
48 if (err)
49 return err;
50
51 flags = ext4_mask_flags(inode->i_mode, flags);
52
53 err = -EPERM;
54 mutex_lock(&inode->i_mutex);
55 /* Is it quota file? Do not allow user to mess with it */
56 if (IS_NOQUOTA(inode))
57 goto flags_out;
58
59 oldflags = ei->i_flags;
60
61 /* The JOURNAL_DATA flag is modifiable only by root */
62 jflag = flags & EXT4_JOURNAL_DATA_FL;
63
64 /*
65 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
66 * the relevant capability.
67 *
68 * This test looks nicer. Thanks to Pauline Middelink
69 */
70 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
71 if (!capable(CAP_LINUX_IMMUTABLE))
72 goto flags_out;
73 }
74
75 /*
76 * The JOURNAL_DATA flag can only be changed by
77 * the relevant capability.
78 */
79 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
80 if (!capable(CAP_SYS_RESOURCE))
81 goto flags_out;
82 }
83 if (oldflags & EXT4_EXTENTS_FL) {
84 /* We don't support clearning extent flags */
85 if (!(flags & EXT4_EXTENTS_FL)) {
86 err = -EOPNOTSUPP;
87 goto flags_out;
88 }
89 } else if (flags & EXT4_EXTENTS_FL) {
90 /* migrate the file */
91 migrate = 1;
92 flags &= ~EXT4_EXTENTS_FL;
93 }
94
95 if (flags & EXT4_EOFBLOCKS_FL) {
96 /* we don't support adding EOFBLOCKS flag */
97 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
98 err = -EOPNOTSUPP;
99 goto flags_out;
100 }
101 } else if (oldflags & EXT4_EOFBLOCKS_FL)
102 ext4_truncate(inode);
103
104 handle = ext4_journal_start(inode, 1);
105 if (IS_ERR(handle)) {
106 err = PTR_ERR(handle);
107 goto flags_out;
108 }
109 if (IS_SYNC(inode))
110 ext4_handle_sync(handle);
111 err = ext4_reserve_inode_write(handle, inode, &iloc);
112 if (err)
113 goto flags_err;
114
115 flags = flags & EXT4_FL_USER_MODIFIABLE;
116 flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
117 ei->i_flags = flags;
118
119 ext4_set_inode_flags(inode);
120 inode->i_ctime = ext4_current_time(inode);
121
122 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
123flags_err:
124 ext4_journal_stop(handle);
125 if (err)
126 goto flags_out;
127
128 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
129 err = ext4_change_inode_journal_flag(inode, jflag);
130 if (err)
131 goto flags_out;
132 if (migrate)
133 err = ext4_ext_migrate(inode);
134flags_out:
135 mutex_unlock(&inode->i_mutex);
136 mnt_drop_write(filp->f_path.mnt);
137 return err;
138 }
139 case EXT4_IOC_GETVERSION:
140 case EXT4_IOC_GETVERSION_OLD:
141 return put_user(inode->i_generation, (int __user *) arg);
142 case EXT4_IOC_SETVERSION:
143 case EXT4_IOC_SETVERSION_OLD: {
144 handle_t *handle;
145 struct ext4_iloc iloc;
146 __u32 generation;
147 int err;
148
149 if (!inode_owner_or_capable(inode))
150 return -EPERM;
151
152 err = mnt_want_write(filp->f_path.mnt);
153 if (err)
154 return err;
155 if (get_user(generation, (int __user *) arg)) {
156 err = -EFAULT;
157 goto setversion_out;
158 }
159
160 handle = ext4_journal_start(inode, 1);
161 if (IS_ERR(handle)) {
162 err = PTR_ERR(handle);
163 goto setversion_out;
164 }
165 err = ext4_reserve_inode_write(handle, inode, &iloc);
166 if (err == 0) {
167 inode->i_ctime = ext4_current_time(inode);
168 inode->i_generation = generation;
169 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
170 }
171 ext4_journal_stop(handle);
172setversion_out:
173 mnt_drop_write(filp->f_path.mnt);
174 return err;
175 }
176#ifdef CONFIG_JBD2_DEBUG
177 case EXT4_IOC_WAIT_FOR_READONLY:
178 /*
179 * This is racy - by the time we're woken up and running,
180 * the superblock could be released. And the module could
181 * have been unloaded. So sue me.
182 *
183 * Returns 1 if it slept, else zero.
184 */
185 {
186 struct super_block *sb = inode->i_sb;
187 DECLARE_WAITQUEUE(wait, current);
188 int ret = 0;
189
190 set_current_state(TASK_INTERRUPTIBLE);
191 add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
192 if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
193 schedule();
194 ret = 1;
195 }
196 remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
197 return ret;
198 }
199#endif
200 case EXT4_IOC_GROUP_EXTEND: {
201 ext4_fsblk_t n_blocks_count;
202 struct super_block *sb = inode->i_sb;
203 int err, err2=0;
204
205 err = ext4_resize_begin(sb);
206 if (err)
207 return err;
208
209 if (get_user(n_blocks_count, (__u32 __user *)arg))
210 return -EFAULT;
211
212 err = mnt_want_write(filp->f_path.mnt);
213 if (err)
214 return err;
215
216 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
217 if (EXT4_SB(sb)->s_journal) {
218 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
219 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
220 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
221 }
222 if (err == 0)
223 err = err2;
224 mnt_drop_write(filp->f_path.mnt);
225 ext4_resize_end(sb);
226
227 return err;
228 }
229
230 case EXT4_IOC_MOVE_EXT: {
231 struct move_extent me;
232 struct file *donor_filp;
233 int err;
234
235 if (!(filp->f_mode & FMODE_READ) ||
236 !(filp->f_mode & FMODE_WRITE))
237 return -EBADF;
238
239 if (copy_from_user(&me,
240 (struct move_extent __user *)arg, sizeof(me)))
241 return -EFAULT;
242 me.moved_len = 0;
243
244 donor_filp = fget(me.donor_fd);
245 if (!donor_filp)
246 return -EBADF;
247
248 if (!(donor_filp->f_mode & FMODE_WRITE)) {
249 err = -EBADF;
250 goto mext_out;
251 }
252
253 err = mnt_want_write(filp->f_path.mnt);
254 if (err)
255 goto mext_out;
256
257 err = ext4_move_extents(filp, donor_filp, me.orig_start,
258 me.donor_start, me.len, &me.moved_len);
259 mnt_drop_write(filp->f_path.mnt);
260 if (me.moved_len > 0)
261 file_remove_suid(donor_filp);
262
263 if (copy_to_user((struct move_extent __user *)arg,
264 &me, sizeof(me)))
265 err = -EFAULT;
266mext_out:
267 fput(donor_filp);
268 return err;
269 }
270
271 case EXT4_IOC_GROUP_ADD: {
272 struct ext4_new_group_data input;
273 struct super_block *sb = inode->i_sb;
274 int err, err2=0;
275
276 err = ext4_resize_begin(sb);
277 if (err)
278 return err;
279
280 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
281 sizeof(input)))
282 return -EFAULT;
283
284 err = mnt_want_write(filp->f_path.mnt);
285 if (err)
286 return err;
287
288 err = ext4_group_add(sb, &input);
289 if (EXT4_SB(sb)->s_journal) {
290 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
291 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
292 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
293 }
294 if (err == 0)
295 err = err2;
296 mnt_drop_write(filp->f_path.mnt);
297 ext4_resize_end(sb);
298
299 return err;
300 }
301
302 case EXT4_IOC_MIGRATE:
303 {
304 int err;
305 if (!inode_owner_or_capable(inode))
306 return -EACCES;
307
308 err = mnt_want_write(filp->f_path.mnt);
309 if (err)
310 return err;
311 /*
312 * inode_mutex prevent write and truncate on the file.
313 * Read still goes through. We take i_data_sem in
314 * ext4_ext_swap_inode_data before we switch the
315 * inode format to prevent read.
316 */
317 mutex_lock(&(inode->i_mutex));
318 err = ext4_ext_migrate(inode);
319 mutex_unlock(&(inode->i_mutex));
320 mnt_drop_write(filp->f_path.mnt);
321 return err;
322 }
323
324 case EXT4_IOC_ALLOC_DA_BLKS:
325 {
326 int err;
327 if (!inode_owner_or_capable(inode))
328 return -EACCES;
329
330 err = mnt_want_write(filp->f_path.mnt);
331 if (err)
332 return err;
333 err = ext4_alloc_da_blocks(inode);
334 mnt_drop_write(filp->f_path.mnt);
335 return err;
336 }
337
338 case FITRIM:
339 {
340 struct super_block *sb = inode->i_sb;
341 struct request_queue *q = bdev_get_queue(sb->s_bdev);
342 struct fstrim_range range;
343 int ret = 0;
344
345 if (!capable(CAP_SYS_ADMIN))
346 return -EPERM;
347
348 if (!blk_queue_discard(q))
349 return -EOPNOTSUPP;
350
351 if (copy_from_user(&range, (struct fstrim_range *)arg,
352 sizeof(range)))
353 return -EFAULT;
354
355 range.minlen = max((unsigned int)range.minlen,
356 q->limits.discard_granularity);
357 ret = ext4_trim_fs(sb, &range);
358 if (ret < 0)
359 return ret;
360
361 if (copy_to_user((struct fstrim_range *)arg, &range,
362 sizeof(range)))
363 return -EFAULT;
364
365 return 0;
366 }
367
368 default:
369 return -ENOTTY;
370 }
371}
372
373#ifdef CONFIG_COMPAT
374long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
375{
376 /* These are just misnamed, they actually get/put from/to user an int */
377 switch (cmd) {
378 case EXT4_IOC32_GETFLAGS:
379 cmd = EXT4_IOC_GETFLAGS;
380 break;
381 case EXT4_IOC32_SETFLAGS:
382 cmd = EXT4_IOC_SETFLAGS;
383 break;
384 case EXT4_IOC32_GETVERSION:
385 cmd = EXT4_IOC_GETVERSION;
386 break;
387 case EXT4_IOC32_SETVERSION:
388 cmd = EXT4_IOC_SETVERSION;
389 break;
390 case EXT4_IOC32_GROUP_EXTEND:
391 cmd = EXT4_IOC_GROUP_EXTEND;
392 break;
393 case EXT4_IOC32_GETVERSION_OLD:
394 cmd = EXT4_IOC_GETVERSION_OLD;
395 break;
396 case EXT4_IOC32_SETVERSION_OLD:
397 cmd = EXT4_IOC_SETVERSION_OLD;
398 break;
399#ifdef CONFIG_JBD2_DEBUG
400 case EXT4_IOC32_WAIT_FOR_READONLY:
401 cmd = EXT4_IOC_WAIT_FOR_READONLY;
402 break;
403#endif
404 case EXT4_IOC32_GETRSVSZ:
405 cmd = EXT4_IOC_GETRSVSZ;
406 break;
407 case EXT4_IOC32_SETRSVSZ:
408 cmd = EXT4_IOC_SETRSVSZ;
409 break;
410 case EXT4_IOC32_GROUP_ADD: {
411 struct compat_ext4_new_group_input __user *uinput;
412 struct ext4_new_group_input input;
413 mm_segment_t old_fs;
414 int err;
415
416 uinput = compat_ptr(arg);
417 err = get_user(input.group, &uinput->group);
418 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
419 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
420 err |= get_user(input.inode_table, &uinput->inode_table);
421 err |= get_user(input.blocks_count, &uinput->blocks_count);
422 err |= get_user(input.reserved_blocks,
423 &uinput->reserved_blocks);
424 if (err)
425 return -EFAULT;
426 old_fs = get_fs();
427 set_fs(KERNEL_DS);
428 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
429 (unsigned long) &input);
430 set_fs(old_fs);
431 return err;
432 }
433 case EXT4_IOC_MOVE_EXT:
434 case FITRIM:
435 break;
436 default:
437 return -ENOIOCTLCMD;
438 }
439 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
440}
441#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