blob: a569d335f8049ac4b5c37e4446eedfd3028166e2 [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/ioctl.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
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>
Mingming Caodab291a2006-10-11 01:21:01 -070011#include <linux/jbd2.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070012#include <linux/capability.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070013#include <linux/time.h>
14#include <linux/compat.h>
Dave Hansen42a74f22008-02-15 14:37:46 -080015#include <linux/mount.h>
Akira Fujita748de672009-06-17 19:24:03 -040016#include <linux/file.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070017#include <asm/uaccess.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040018#include "ext4_jbd2.h"
19#include "ext4.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070020
Yongqiang Yang19c52462012-01-04 17:09:44 -050021#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
22
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -040023/**
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));
Theodore Ts'ocde2d7a2013-08-12 09:29:30 -040079 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);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -040083
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;
105 struct ext4_inode_info *ei_bl;
106 struct ext4_sb_info *sbi;
107
108 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode)) {
109 err = -EINVAL;
110 goto swap_boot_out;
111 }
112
113 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
114 err = -EPERM;
115 goto swap_boot_out;
116 }
117
118 sbi = EXT4_SB(sb);
119 ei = EXT4_I(inode);
120
121 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
122 if (IS_ERR(inode_bl)) {
123 err = PTR_ERR(inode_bl);
124 goto swap_boot_out;
125 }
126 ei_bl = EXT4_I(inode_bl);
127
128 filemap_flush(inode->i_mapping);
129 filemap_flush(inode_bl->i_mapping);
130
131 /* Protect orig inodes against a truncate and make sure,
132 * that only 1 swap_inode_boot_loader is running. */
133 ext4_inode_double_lock(inode, inode_bl);
134
135 truncate_inode_pages(&inode->i_data, 0);
136 truncate_inode_pages(&inode_bl->i_data, 0);
137
138 /* Wait for all existing dio workers */
139 ext4_inode_block_unlocked_dio(inode);
140 ext4_inode_block_unlocked_dio(inode_bl);
141 inode_dio_wait(inode);
142 inode_dio_wait(inode_bl);
143
144 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
145 if (IS_ERR(handle)) {
146 err = -EINVAL;
147 goto swap_boot_out;
148 }
149
150 /* Protect extent tree against block allocations via delalloc */
151 ext4_double_down_write_data_sem(inode, inode_bl);
152
153 if (inode_bl->i_nlink == 0) {
154 /* this inode has never been used as a BOOT_LOADER */
155 set_nlink(inode_bl, 1);
156 i_uid_write(inode_bl, 0);
157 i_gid_write(inode_bl, 0);
158 inode_bl->i_flags = 0;
159 ei_bl->i_flags = 0;
160 inode_bl->i_version = 1;
161 i_size_write(inode_bl, 0);
162 inode_bl->i_mode = S_IFREG;
163 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
164 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
165 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
166 ext4_ext_tree_init(handle, inode_bl);
167 } else
168 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
169 }
170
171 swap_inode_data(inode, inode_bl);
172
173 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
174
175 spin_lock(&sbi->s_next_gen_lock);
176 inode->i_generation = sbi->s_next_generation++;
177 inode_bl->i_generation = sbi->s_next_generation++;
178 spin_unlock(&sbi->s_next_gen_lock);
179
180 ext4_discard_preallocations(inode);
181
182 err = ext4_mark_inode_dirty(handle, inode);
183 if (err < 0) {
184 ext4_warning(inode->i_sb,
185 "couldn't mark inode #%lu dirty (err %d)",
186 inode->i_ino, err);
187 /* Revert all changes: */
188 swap_inode_data(inode, inode_bl);
189 } else {
190 err = ext4_mark_inode_dirty(handle, inode_bl);
191 if (err < 0) {
192 ext4_warning(inode_bl->i_sb,
193 "couldn't mark inode #%lu dirty (err %d)",
194 inode_bl->i_ino, err);
195 /* Revert all changes: */
196 swap_inode_data(inode, inode_bl);
197 ext4_mark_inode_dirty(handle, inode);
198 }
199 }
200
201 ext4_journal_stop(handle);
202
203 ext4_double_up_write_data_sem(inode, inode_bl);
204
205 ext4_inode_resume_unlocked_dio(inode);
206 ext4_inode_resume_unlocked_dio(inode_bl);
207
208 ext4_inode_double_unlock(inode, inode_bl);
209
210 iput(inode_bl);
211
212swap_boot_out:
213 return err;
214}
215
Andi Kleen5cdd7b22008-04-29 22:03:54 -0400216long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700217{
Al Viro496ad9a2013-01-23 17:07:38 -0500218 struct inode *inode = file_inode(filp);
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400219 struct super_block *sb = inode->i_sb;
Mingming Cao617ba132006-10-11 01:20:53 -0700220 struct ext4_inode_info *ei = EXT4_I(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700221 unsigned int flags;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700222
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400223 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700224
225 switch (cmd) {
Mingming Cao617ba132006-10-11 01:20:53 -0700226 case EXT4_IOC_GETFLAGS:
Jan Karaff9ddf72007-07-18 09:24:20 -0400227 ext4_get_inode_flags(ei);
Mingming Cao617ba132006-10-11 01:20:53 -0700228 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700229 return put_user(flags, (int __user *) arg);
Mingming Cao617ba132006-10-11 01:20:53 -0700230 case EXT4_IOC_SETFLAGS: {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700231 handle_t *handle = NULL;
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400232 int err, migrate = 0;
Mingming Cao617ba132006-10-11 01:20:53 -0700233 struct ext4_iloc iloc;
Theodore Ts'o79906962012-05-31 23:46:01 -0400234 unsigned int oldflags, mask, i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700235 unsigned int jflag;
236
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700237 if (!inode_owner_or_capable(inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700238 return -EACCES;
239
240 if (get_user(flags, (int __user *) arg))
241 return -EFAULT;
242
Al Viroa561be72011-11-23 11:57:51 -0500243 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800244 if (err)
245 return err;
246
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500247 flags = ext4_mask_flags(inode->i_mode, flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700248
Dave Hansen42a74f22008-02-15 14:37:46 -0800249 err = -EPERM;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700250 mutex_lock(&inode->i_mutex);
Jan Karae47776a2007-11-14 16:58:56 -0800251 /* Is it quota file? Do not allow user to mess with it */
Dave Hansen42a74f22008-02-15 14:37:46 -0800252 if (IS_NOQUOTA(inode))
253 goto flags_out;
254
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700255 oldflags = ei->i_flags;
256
257 /* The JOURNAL_DATA flag is modifiable only by root */
Mingming Cao617ba132006-10-11 01:20:53 -0700258 jflag = flags & EXT4_JOURNAL_DATA_FL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700259
260 /*
261 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
262 * the relevant capability.
263 *
264 * This test looks nicer. Thanks to Pauline Middelink
265 */
Mingming Cao617ba132006-10-11 01:20:53 -0700266 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
Dave Hansen42a74f22008-02-15 14:37:46 -0800267 if (!capable(CAP_LINUX_IMMUTABLE))
268 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700269 }
270
271 /*
272 * The JOURNAL_DATA flag can only be changed by
273 * the relevant capability.
274 */
Mingming Cao617ba132006-10-11 01:20:53 -0700275 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
Dave Hansen42a74f22008-02-15 14:37:46 -0800276 if (!capable(CAP_SYS_RESOURCE))
277 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700278 }
Theodore Ts'o996bb9f2013-04-03 22:04:52 -0400279 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400280 migrate = 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700281
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500282 if (flags & EXT4_EOFBLOCKS_FL) {
283 /* we don't support adding EOFBLOCKS flag */
284 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
285 err = -EOPNOTSUPP;
286 goto flags_out;
287 }
288 } else if (oldflags & EXT4_EOFBLOCKS_FL)
289 ext4_truncate(inode);
290
Theodore Ts'o9924a922013-02-08 21:59:22 -0500291 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700292 if (IS_ERR(handle)) {
Dave Hansen42a74f22008-02-15 14:37:46 -0800293 err = PTR_ERR(handle);
294 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700295 }
296 if (IS_SYNC(inode))
Frank Mayhar03901312009-01-07 00:06:22 -0500297 ext4_handle_sync(handle);
Mingming Cao617ba132006-10-11 01:20:53 -0700298 err = ext4_reserve_inode_write(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700299 if (err)
300 goto flags_err;
301
Theodore Ts'o79906962012-05-31 23:46:01 -0400302 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
303 if (!(mask & EXT4_FL_USER_MODIFIABLE))
304 continue;
305 if (mask & flags)
306 ext4_set_inode_flag(inode, i);
307 else
308 ext4_clear_inode_flag(inode, i);
309 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700310
Mingming Cao617ba132006-10-11 01:20:53 -0700311 ext4_set_inode_flags(inode);
Kalpak Shahef7f3832007-07-18 09:15:20 -0400312 inode->i_ctime = ext4_current_time(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700313
Mingming Cao617ba132006-10-11 01:20:53 -0700314 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700315flags_err:
Mingming Cao617ba132006-10-11 01:20:53 -0700316 ext4_journal_stop(handle);
Dave Hansen42a74f22008-02-15 14:37:46 -0800317 if (err)
318 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700319
Mingming Cao617ba132006-10-11 01:20:53 -0700320 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
321 err = ext4_change_inode_journal_flag(inode, jflag);
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400322 if (err)
323 goto flags_out;
Theodore Ts'o996bb9f2013-04-03 22:04:52 -0400324 if (migrate) {
325 if (flags & EXT4_EXTENTS_FL)
326 err = ext4_ext_migrate(inode);
327 else
328 err = ext4_ind_migrate(inode);
329 }
330
Dave Hansen42a74f22008-02-15 14:37:46 -0800331flags_out:
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700332 mutex_unlock(&inode->i_mutex);
Al Viro2a79f172011-12-09 08:06:57 -0500333 mnt_drop_write_file(filp);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700334 return err;
335 }
Mingming Cao617ba132006-10-11 01:20:53 -0700336 case EXT4_IOC_GETVERSION:
337 case EXT4_IOC_GETVERSION_OLD:
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700338 return put_user(inode->i_generation, (int __user *) arg);
Mingming Cao617ba132006-10-11 01:20:53 -0700339 case EXT4_IOC_SETVERSION:
340 case EXT4_IOC_SETVERSION_OLD: {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700341 handle_t *handle;
Mingming Cao617ba132006-10-11 01:20:53 -0700342 struct ext4_iloc iloc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700343 __u32 generation;
344 int err;
345
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700346 if (!inode_owner_or_capable(inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700347 return -EPERM;
Dave Hansen42a74f22008-02-15 14:37:46 -0800348
Darrick J. Wong814525f2012-04-29 18:31:10 -0400349 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
350 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
351 ext4_warning(sb, "Setting inode version is not "
352 "supported with metadata_csum enabled.");
353 return -ENOTTY;
354 }
355
Al Viroa561be72011-11-23 11:57:51 -0500356 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800357 if (err)
358 return err;
359 if (get_user(generation, (int __user *) arg)) {
360 err = -EFAULT;
361 goto setversion_out;
362 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700363
Djalal Harouni6c2155b2012-01-03 02:31:52 +0100364 mutex_lock(&inode->i_mutex);
Theodore Ts'o9924a922013-02-08 21:59:22 -0500365 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Dave Hansen42a74f22008-02-15 14:37:46 -0800366 if (IS_ERR(handle)) {
367 err = PTR_ERR(handle);
Djalal Harouni6c2155b2012-01-03 02:31:52 +0100368 goto unlock_out;
Dave Hansen42a74f22008-02-15 14:37:46 -0800369 }
Mingming Cao617ba132006-10-11 01:20:53 -0700370 err = ext4_reserve_inode_write(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700371 if (err == 0) {
Kalpak Shahef7f3832007-07-18 09:15:20 -0400372 inode->i_ctime = ext4_current_time(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700373 inode->i_generation = generation;
Mingming Cao617ba132006-10-11 01:20:53 -0700374 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700375 }
Mingming Cao617ba132006-10-11 01:20:53 -0700376 ext4_journal_stop(handle);
Djalal Harouni6c2155b2012-01-03 02:31:52 +0100377
378unlock_out:
379 mutex_unlock(&inode->i_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -0800380setversion_out:
Al Viro2a79f172011-12-09 08:06:57 -0500381 mnt_drop_write_file(filp);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700382 return err;
383 }
Mingming Cao617ba132006-10-11 01:20:53 -0700384 case EXT4_IOC_GROUP_EXTEND: {
385 ext4_fsblk_t n_blocks_count;
Peng Taoac046f12009-07-13 09:30:17 -0400386 int err, err2=0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700387
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400388 err = ext4_resize_begin(sb);
389 if (err)
390 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700391
Djalal Harouni014a1772012-01-04 17:09:52 -0500392 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
393 err = -EFAULT;
394 goto group_extend_out;
395 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700396
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400397 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
398 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
399 ext4_msg(sb, KERN_ERR,
400 "Online resizing not supported with bigalloc");
Djalal Harouni014a1772012-01-04 17:09:52 -0500401 err = -EOPNOTSUPP;
402 goto group_extend_out;
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400403 }
404
Al Viroa561be72011-11-23 11:57:51 -0500405 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800406 if (err)
Djalal Harouni014a1772012-01-04 17:09:52 -0500407 goto group_extend_out;
Dave Hansen42a74f22008-02-15 14:37:46 -0800408
Mingming Cao617ba132006-10-11 01:20:53 -0700409 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
Peng Taoac046f12009-07-13 09:30:17 -0400410 if (EXT4_SB(sb)->s_journal) {
411 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
412 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
413 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
414 }
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -0400415 if (err == 0)
416 err = err2;
Al Viro2a79f172011-12-09 08:06:57 -0500417 mnt_drop_write_file(filp);
Djalal Harouni014a1772012-01-04 17:09:52 -0500418group_extend_out:
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400419 ext4_resize_end(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700420 return err;
421 }
Akira Fujita748de672009-06-17 19:24:03 -0400422
423 case EXT4_IOC_MOVE_EXT: {
424 struct move_extent me;
Al Viro2903ff02012-08-28 12:52:22 -0400425 struct fd donor;
426 int err;
Akira Fujita748de672009-06-17 19:24:03 -0400427
Akira Fujita4a585792009-12-06 23:38:31 -0500428 if (!(filp->f_mode & FMODE_READ) ||
429 !(filp->f_mode & FMODE_WRITE))
430 return -EBADF;
431
Akira Fujita748de672009-06-17 19:24:03 -0400432 if (copy_from_user(&me,
433 (struct move_extent __user *)arg, sizeof(me)))
434 return -EFAULT;
Akira Fujita4a585792009-12-06 23:38:31 -0500435 me.moved_len = 0;
Akira Fujita748de672009-06-17 19:24:03 -0400436
Al Viro2903ff02012-08-28 12:52:22 -0400437 donor = fdget(me.donor_fd);
438 if (!donor.file)
Akira Fujita748de672009-06-17 19:24:03 -0400439 return -EBADF;
440
Al Viro2903ff02012-08-28 12:52:22 -0400441 if (!(donor.file->f_mode & FMODE_WRITE)) {
Akira Fujita4a585792009-12-06 23:38:31 -0500442 err = -EBADF;
443 goto mext_out;
Akira Fujita748de672009-06-17 19:24:03 -0400444 }
445
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400446 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
447 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
448 ext4_msg(sb, KERN_ERR,
449 "Online defrag not supported with bigalloc");
Al Viro399c9b82012-08-26 21:00:03 -0400450 err = -EOPNOTSUPP;
451 goto mext_out;
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400452 }
453
Al Viroa561be72011-11-23 11:57:51 -0500454 err = mnt_want_write_file(filp);
Akira Fujita4a585792009-12-06 23:38:31 -0500455 if (err)
456 goto mext_out;
457
Al Viro2903ff02012-08-28 12:52:22 -0400458 err = ext4_move_extents(filp, donor.file, me.orig_start,
Akira Fujita748de672009-06-17 19:24:03 -0400459 me.donor_start, me.len, &me.moved_len);
Al Viro2a79f172011-12-09 08:06:57 -0500460 mnt_drop_write_file(filp);
Akira Fujita748de672009-06-17 19:24:03 -0400461
Theodore Ts'o60e66792010-05-17 07:00:00 -0400462 if (copy_to_user((struct move_extent __user *)arg,
Akira Fujitac437b272010-03-04 00:39:24 -0500463 &me, sizeof(me)))
Akira Fujita4a585792009-12-06 23:38:31 -0500464 err = -EFAULT;
465mext_out:
Al Viro2903ff02012-08-28 12:52:22 -0400466 fdput(donor);
Akira Fujita748de672009-06-17 19:24:03 -0400467 return err;
468 }
469
Mingming Cao617ba132006-10-11 01:20:53 -0700470 case EXT4_IOC_GROUP_ADD: {
471 struct ext4_new_group_data input;
Peng Taoac046f12009-07-13 09:30:17 -0400472 int err, err2=0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700473
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400474 err = ext4_resize_begin(sb);
475 if (err)
476 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700477
Mingming Cao617ba132006-10-11 01:20:53 -0700478 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
Djalal Harouni014a1772012-01-04 17:09:52 -0500479 sizeof(input))) {
480 err = -EFAULT;
481 goto group_add_out;
482 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700483
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400484 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
485 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
486 ext4_msg(sb, KERN_ERR,
487 "Online resizing not supported with bigalloc");
Djalal Harouni014a1772012-01-04 17:09:52 -0500488 err = -EOPNOTSUPP;
489 goto group_add_out;
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400490 }
491
Al Viroa561be72011-11-23 11:57:51 -0500492 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800493 if (err)
Djalal Harouni014a1772012-01-04 17:09:52 -0500494 goto group_add_out;
Dave Hansen42a74f22008-02-15 14:37:46 -0800495
Mingming Cao617ba132006-10-11 01:20:53 -0700496 err = ext4_group_add(sb, &input);
Peng Taoac046f12009-07-13 09:30:17 -0400497 if (EXT4_SB(sb)->s_journal) {
498 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
499 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
500 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
501 }
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -0400502 if (err == 0)
503 err = err2;
Al Viro2a79f172011-12-09 08:06:57 -0500504 mnt_drop_write_file(filp);
Theodore Ts'o7f511862013-01-13 08:41:45 -0500505 if (!err && ext4_has_group_desc_csum(sb) &&
506 test_opt(sb, INIT_INODE_TABLE))
507 err = ext4_register_li_request(sb, input.group);
Djalal Harouni014a1772012-01-04 17:09:52 -0500508group_add_out:
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400509 ext4_resize_end(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700510 return err;
511 }
512
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500513 case EXT4_IOC_MIGRATE:
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400514 {
515 int err;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700516 if (!inode_owner_or_capable(inode))
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400517 return -EACCES;
518
Al Viroa561be72011-11-23 11:57:51 -0500519 err = mnt_want_write_file(filp);
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400520 if (err)
521 return err;
522 /*
523 * inode_mutex prevent write and truncate on the file.
524 * Read still goes through. We take i_data_sem in
525 * ext4_ext_swap_inode_data before we switch the
526 * inode format to prevent read.
527 */
528 mutex_lock(&(inode->i_mutex));
529 err = ext4_ext_migrate(inode);
530 mutex_unlock(&(inode->i_mutex));
Al Viro2a79f172011-12-09 08:06:57 -0500531 mnt_drop_write_file(filp);
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400532 return err;
533 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500534
Theodore Ts'occd25062009-02-26 01:04:07 -0500535 case EXT4_IOC_ALLOC_DA_BLKS:
536 {
537 int err;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700538 if (!inode_owner_or_capable(inode))
Theodore Ts'occd25062009-02-26 01:04:07 -0500539 return -EACCES;
540
Al Viroa561be72011-11-23 11:57:51 -0500541 err = mnt_want_write_file(filp);
Theodore Ts'occd25062009-02-26 01:04:07 -0500542 if (err)
543 return err;
544 err = ext4_alloc_da_blocks(inode);
Al Viro2a79f172011-12-09 08:06:57 -0500545 mnt_drop_write_file(filp);
Theodore Ts'occd25062009-02-26 01:04:07 -0500546 return err;
547 }
548
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400549 case EXT4_IOC_SWAP_BOOT:
550 if (!(filp->f_mode & FMODE_WRITE))
551 return -EBADF;
552 return swap_inode_boot_loader(sb, inode);
553
Yongqiang Yang19c52462012-01-04 17:09:44 -0500554 case EXT4_IOC_RESIZE_FS: {
555 ext4_fsblk_t n_blocks_count;
Yongqiang Yang19c52462012-01-04 17:09:44 -0500556 int err = 0, err2 = 0;
Theodore Ts'o7f511862013-01-13 08:41:45 -0500557 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
Yongqiang Yang19c52462012-01-04 17:09:44 -0500558
559 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
560 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
561 ext4_msg(sb, KERN_ERR,
562 "Online resizing not (yet) supported with bigalloc");
563 return -EOPNOTSUPP;
564 }
565
Yongqiang Yang19c52462012-01-04 17:09:44 -0500566 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
567 sizeof(__u64))) {
568 return -EFAULT;
569 }
570
Yongqiang Yang19c52462012-01-04 17:09:44 -0500571 err = ext4_resize_begin(sb);
572 if (err)
573 return err;
574
Al Viro8cae6f72012-07-19 11:19:07 +0400575 err = mnt_want_write_file(filp);
Yongqiang Yang19c52462012-01-04 17:09:44 -0500576 if (err)
577 goto resizefs_out;
578
579 err = ext4_resize_fs(sb, n_blocks_count);
580 if (EXT4_SB(sb)->s_journal) {
581 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
582 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
583 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
584 }
585 if (err == 0)
586 err = err2;
Al Viro8cae6f72012-07-19 11:19:07 +0400587 mnt_drop_write_file(filp);
Theodore Ts'o7f511862013-01-13 08:41:45 -0500588 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
589 ext4_has_group_desc_csum(sb) &&
590 test_opt(sb, INIT_INODE_TABLE))
591 err = ext4_register_li_request(sb, o_group);
592
Yongqiang Yang19c52462012-01-04 17:09:44 -0500593resizefs_out:
594 ext4_resize_end(sb);
595 return err;
596 }
597
Lukas Czernere681c042010-11-19 21:47:07 -0500598 case FITRIM:
599 {
Lukas Czerner41431792011-02-23 12:42:32 -0500600 struct request_queue *q = bdev_get_queue(sb->s_bdev);
Lukas Czernere681c042010-11-19 21:47:07 -0500601 struct fstrim_range range;
602 int ret = 0;
603
604 if (!capable(CAP_SYS_ADMIN))
605 return -EPERM;
606
Lukas Czerner41431792011-02-23 12:42:32 -0500607 if (!blk_queue_discard(q))
608 return -EOPNOTSUPP;
609
H Hartley Sweetene6705f72011-10-18 10:59:51 -0400610 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
Lukas Czernere681c042010-11-19 21:47:07 -0500611 sizeof(range)))
612 return -EFAULT;
613
Lukas Czerner5c2ed622011-02-23 17:49:51 -0500614 range.minlen = max((unsigned int)range.minlen,
615 q->limits.discard_granularity);
Lukas Czernere681c042010-11-19 21:47:07 -0500616 ret = ext4_trim_fs(sb, &range);
617 if (ret < 0)
618 return ret;
619
H Hartley Sweetene6705f72011-10-18 10:59:51 -0400620 if (copy_to_user((struct fstrim_range __user *)arg, &range,
Lukas Czernere681c042010-11-19 21:47:07 -0500621 sizeof(range)))
622 return -EFAULT;
623
624 return 0;
625 }
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400626 case EXT4_IOC_PRECACHE_EXTENTS:
627 return ext4_ext_precache(inode);
Lukas Czernere681c042010-11-19 21:47:07 -0500628
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700629 default:
630 return -ENOTTY;
631 }
632}
633
634#ifdef CONFIG_COMPAT
Mingming Cao617ba132006-10-11 01:20:53 -0700635long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700636{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700637 /* These are just misnamed, they actually get/put from/to user an int */
638 switch (cmd) {
Mingming Cao617ba132006-10-11 01:20:53 -0700639 case EXT4_IOC32_GETFLAGS:
640 cmd = EXT4_IOC_GETFLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700641 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700642 case EXT4_IOC32_SETFLAGS:
643 cmd = EXT4_IOC_SETFLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700644 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700645 case EXT4_IOC32_GETVERSION:
646 cmd = EXT4_IOC_GETVERSION;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700647 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700648 case EXT4_IOC32_SETVERSION:
649 cmd = EXT4_IOC_SETVERSION;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700650 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700651 case EXT4_IOC32_GROUP_EXTEND:
652 cmd = EXT4_IOC_GROUP_EXTEND;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700653 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700654 case EXT4_IOC32_GETVERSION_OLD:
655 cmd = EXT4_IOC_GETVERSION_OLD;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700656 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700657 case EXT4_IOC32_SETVERSION_OLD:
658 cmd = EXT4_IOC_SETVERSION_OLD;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700659 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700660 case EXT4_IOC32_GETRSVSZ:
661 cmd = EXT4_IOC_GETRSVSZ;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700662 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700663 case EXT4_IOC32_SETRSVSZ:
664 cmd = EXT4_IOC_SETRSVSZ;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700665 break;
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400666 case EXT4_IOC32_GROUP_ADD: {
667 struct compat_ext4_new_group_input __user *uinput;
668 struct ext4_new_group_input input;
669 mm_segment_t old_fs;
670 int err;
671
672 uinput = compat_ptr(arg);
673 err = get_user(input.group, &uinput->group);
674 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
675 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
676 err |= get_user(input.inode_table, &uinput->inode_table);
677 err |= get_user(input.blocks_count, &uinput->blocks_count);
678 err |= get_user(input.reserved_blocks,
679 &uinput->reserved_blocks);
680 if (err)
681 return -EFAULT;
682 old_fs = get_fs();
683 set_fs(KERNEL_DS);
684 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
685 (unsigned long) &input);
686 set_fs(old_fs);
687 return err;
688 }
Christian Borntraegerb684b2e2010-05-15 00:00:00 -0400689 case EXT4_IOC_MOVE_EXT:
Tao Maa56e69c2011-03-20 23:16:58 -0400690 case FITRIM:
Yongqiang Yang19c52462012-01-04 17:09:44 -0500691 case EXT4_IOC_RESIZE_FS:
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400692 case EXT4_IOC_PRECACHE_EXTENTS:
Christian Borntraegerb684b2e2010-05-15 00:00:00 -0400693 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700694 default:
695 return -ENOIOCTLCMD;
696 }
Andi Kleen5cdd7b22008-04-29 22:03:54 -0400697 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700698}
699#endif