blob: 1346cfa355d0f167837a68d08325fa3529ebbc31 [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>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070011#include <linux/capability.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070012#include <linux/time.h>
13#include <linux/compat.h>
Dave Hansen42a74f22008-02-15 14:37:46 -080014#include <linux/mount.h>
Akira Fujita748de672009-06-17 19:24:03 -040015#include <linux/file.h>
Michael Halcrow9bd82122015-04-11 07:48:01 -040016#include <linux/random.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;
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -040034
35 ap = (unsigned char *)a;
36 bp = (unsigned char *)b;
37 while (len-- > 0) {
Fabian Frederick4b7e2db2015-06-12 23:46:33 -040038 swap(*ap, *bp);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -040039 ap++;
40 bp++;
41 }
42}
43
44/**
45 * Swap i_data and associated attributes between @inode1 and @inode2.
46 * This function is used for the primary swap between inode1 and inode2
47 * and also to revert this primary swap in case of errors.
48 *
49 * Therefore you have to make sure, that calling this method twice
50 * will revert all changes.
51 *
52 * @inode1: pointer to first inode
53 * @inode2: pointer to second inode
54 */
55static void swap_inode_data(struct inode *inode1, struct inode *inode2)
56{
57 loff_t isize;
58 struct ext4_inode_info *ei1;
59 struct ext4_inode_info *ei2;
60
61 ei1 = EXT4_I(inode1);
62 ei2 = EXT4_I(inode2);
63
64 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
65 memswap(&inode1->i_version, &inode2->i_version,
66 sizeof(inode1->i_version));
67 memswap(&inode1->i_blocks, &inode2->i_blocks,
68 sizeof(inode1->i_blocks));
69 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
70 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
71 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
72
73 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
74 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
75 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
Theodore Ts'ocde2d7a2013-08-12 09:29:30 -040076 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
77 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -040078
79 isize = i_size_read(inode1);
80 i_size_write(inode1, i_size_read(inode2));
81 i_size_write(inode2, isize);
82}
83
84/**
85 * Swap the information from the given @inode and the inode
86 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
87 * important fields of the inodes.
88 *
89 * @sb: the super block of the filesystem
90 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO
91 *
92 */
93static long swap_inode_boot_loader(struct super_block *sb,
94 struct inode *inode)
95{
96 handle_t *handle;
97 int err;
98 struct inode *inode_bl;
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -040099 struct ext4_inode_info *ei_bl;
jon ernstd7092ae2014-01-11 13:26:56 -0500100 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400101
Theodore Ts'od8558a22014-02-17 20:44:36 -0500102 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
103 return -EINVAL;
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400104
Theodore Ts'od8558a22014-02-17 20:44:36 -0500105 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
106 return -EPERM;
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400107
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400108 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
Theodore Ts'od8558a22014-02-17 20:44:36 -0500109 if (IS_ERR(inode_bl))
110 return PTR_ERR(inode_bl);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400111 ei_bl = EXT4_I(inode_bl);
112
113 filemap_flush(inode->i_mapping);
114 filemap_flush(inode_bl->i_mapping);
115
116 /* Protect orig inodes against a truncate and make sure,
117 * that only 1 swap_inode_boot_loader is running. */
J. Bruce Fields375e2892012-04-18 15:16:33 -0400118 lock_two_nondirectories(inode, inode_bl);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400119
120 truncate_inode_pages(&inode->i_data, 0);
121 truncate_inode_pages(&inode_bl->i_data, 0);
122
123 /* Wait for all existing dio workers */
124 ext4_inode_block_unlocked_dio(inode);
125 ext4_inode_block_unlocked_dio(inode_bl);
126 inode_dio_wait(inode);
127 inode_dio_wait(inode_bl);
128
129 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
130 if (IS_ERR(handle)) {
131 err = -EINVAL;
Zheng Liu30d29b12014-02-12 11:48:31 -0500132 goto journal_err_out;
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400133 }
134
135 /* Protect extent tree against block allocations via delalloc */
136 ext4_double_down_write_data_sem(inode, inode_bl);
137
138 if (inode_bl->i_nlink == 0) {
139 /* this inode has never been used as a BOOT_LOADER */
140 set_nlink(inode_bl, 1);
141 i_uid_write(inode_bl, 0);
142 i_gid_write(inode_bl, 0);
143 inode_bl->i_flags = 0;
144 ei_bl->i_flags = 0;
145 inode_bl->i_version = 1;
146 i_size_write(inode_bl, 0);
147 inode_bl->i_mode = S_IFREG;
148 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
149 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
150 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
151 ext4_ext_tree_init(handle, inode_bl);
152 } else
153 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
154 }
155
156 swap_inode_data(inode, inode_bl);
157
158 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
159
160 spin_lock(&sbi->s_next_gen_lock);
161 inode->i_generation = sbi->s_next_generation++;
162 inode_bl->i_generation = sbi->s_next_generation++;
163 spin_unlock(&sbi->s_next_gen_lock);
164
165 ext4_discard_preallocations(inode);
166
167 err = ext4_mark_inode_dirty(handle, inode);
168 if (err < 0) {
169 ext4_warning(inode->i_sb,
170 "couldn't mark inode #%lu dirty (err %d)",
171 inode->i_ino, err);
172 /* Revert all changes: */
173 swap_inode_data(inode, inode_bl);
174 } else {
175 err = ext4_mark_inode_dirty(handle, inode_bl);
176 if (err < 0) {
177 ext4_warning(inode_bl->i_sb,
178 "couldn't mark inode #%lu dirty (err %d)",
179 inode_bl->i_ino, err);
180 /* Revert all changes: */
181 swap_inode_data(inode, inode_bl);
182 ext4_mark_inode_dirty(handle, inode);
183 }
184 }
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400185 ext4_journal_stop(handle);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400186 ext4_double_up_write_data_sem(inode, inode_bl);
187
Zheng Liu30d29b12014-02-12 11:48:31 -0500188journal_err_out:
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400189 ext4_inode_resume_unlocked_dio(inode);
190 ext4_inode_resume_unlocked_dio(inode_bl);
J. Bruce Fields375e2892012-04-18 15:16:33 -0400191 unlock_two_nondirectories(inode, inode_bl);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400192 iput(inode_bl);
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400193 return err;
194}
195
Michael Halcrow9bd82122015-04-11 07:48:01 -0400196static int uuid_is_zero(__u8 u[16])
197{
198 int i;
199
200 for (i = 0; i < 16; i++)
201 if (u[i])
202 return 0;
203 return 1;
204}
205
Andi Kleen5cdd7b22008-04-29 22:03:54 -0400206long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700207{
Al Viro496ad9a2013-01-23 17:07:38 -0500208 struct inode *inode = file_inode(filp);
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400209 struct super_block *sb = inode->i_sb;
Mingming Cao617ba132006-10-11 01:20:53 -0700210 struct ext4_inode_info *ei = EXT4_I(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700211 unsigned int flags;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700212
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400213 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700214
215 switch (cmd) {
Mingming Cao617ba132006-10-11 01:20:53 -0700216 case EXT4_IOC_GETFLAGS:
Jan Karaff9ddf72007-07-18 09:24:20 -0400217 ext4_get_inode_flags(ei);
Mingming Cao617ba132006-10-11 01:20:53 -0700218 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700219 return put_user(flags, (int __user *) arg);
Mingming Cao617ba132006-10-11 01:20:53 -0700220 case EXT4_IOC_SETFLAGS: {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700221 handle_t *handle = NULL;
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400222 int err, migrate = 0;
Mingming Cao617ba132006-10-11 01:20:53 -0700223 struct ext4_iloc iloc;
Theodore Ts'o79906962012-05-31 23:46:01 -0400224 unsigned int oldflags, mask, i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700225 unsigned int jflag;
226
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700227 if (!inode_owner_or_capable(inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700228 return -EACCES;
229
230 if (get_user(flags, (int __user *) arg))
231 return -EFAULT;
232
Al Viroa561be72011-11-23 11:57:51 -0500233 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800234 if (err)
235 return err;
236
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500237 flags = ext4_mask_flags(inode->i_mode, flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700238
Dave Hansen42a74f22008-02-15 14:37:46 -0800239 err = -EPERM;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700240 mutex_lock(&inode->i_mutex);
Jan Karae47776a2007-11-14 16:58:56 -0800241 /* Is it quota file? Do not allow user to mess with it */
Dave Hansen42a74f22008-02-15 14:37:46 -0800242 if (IS_NOQUOTA(inode))
243 goto flags_out;
244
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700245 oldflags = ei->i_flags;
246
247 /* The JOURNAL_DATA flag is modifiable only by root */
Mingming Cao617ba132006-10-11 01:20:53 -0700248 jflag = flags & EXT4_JOURNAL_DATA_FL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700249
250 /*
251 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
252 * the relevant capability.
253 *
254 * This test looks nicer. Thanks to Pauline Middelink
255 */
Mingming Cao617ba132006-10-11 01:20:53 -0700256 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
Dave Hansen42a74f22008-02-15 14:37:46 -0800257 if (!capable(CAP_LINUX_IMMUTABLE))
258 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700259 }
260
261 /*
262 * The JOURNAL_DATA flag can only be changed by
263 * the relevant capability.
264 */
Mingming Cao617ba132006-10-11 01:20:53 -0700265 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
Dave Hansen42a74f22008-02-15 14:37:46 -0800266 if (!capable(CAP_SYS_RESOURCE))
267 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700268 }
Theodore Ts'o996bb9f2013-04-03 22:04:52 -0400269 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400270 migrate = 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700271
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500272 if (flags & EXT4_EOFBLOCKS_FL) {
273 /* we don't support adding EOFBLOCKS flag */
274 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
275 err = -EOPNOTSUPP;
276 goto flags_out;
277 }
278 } else if (oldflags & EXT4_EOFBLOCKS_FL)
279 ext4_truncate(inode);
280
Theodore Ts'o9924a922013-02-08 21:59:22 -0500281 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700282 if (IS_ERR(handle)) {
Dave Hansen42a74f22008-02-15 14:37:46 -0800283 err = PTR_ERR(handle);
284 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700285 }
286 if (IS_SYNC(inode))
Frank Mayhar03901312009-01-07 00:06:22 -0500287 ext4_handle_sync(handle);
Mingming Cao617ba132006-10-11 01:20:53 -0700288 err = ext4_reserve_inode_write(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700289 if (err)
290 goto flags_err;
291
Theodore Ts'o79906962012-05-31 23:46:01 -0400292 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
293 if (!(mask & EXT4_FL_USER_MODIFIABLE))
294 continue;
295 if (mask & flags)
296 ext4_set_inode_flag(inode, i);
297 else
298 ext4_clear_inode_flag(inode, i);
299 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700300
Mingming Cao617ba132006-10-11 01:20:53 -0700301 ext4_set_inode_flags(inode);
Kalpak Shahef7f3832007-07-18 09:15:20 -0400302 inode->i_ctime = ext4_current_time(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700303
Mingming Cao617ba132006-10-11 01:20:53 -0700304 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700305flags_err:
Mingming Cao617ba132006-10-11 01:20:53 -0700306 ext4_journal_stop(handle);
Dave Hansen42a74f22008-02-15 14:37:46 -0800307 if (err)
308 goto flags_out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700309
Mingming Cao617ba132006-10-11 01:20:53 -0700310 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
311 err = ext4_change_inode_journal_flag(inode, jflag);
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400312 if (err)
313 goto flags_out;
Theodore Ts'o996bb9f2013-04-03 22:04:52 -0400314 if (migrate) {
315 if (flags & EXT4_EXTENTS_FL)
316 err = ext4_ext_migrate(inode);
317 else
318 err = ext4_ind_migrate(inode);
319 }
320
Dave Hansen42a74f22008-02-15 14:37:46 -0800321flags_out:
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700322 mutex_unlock(&inode->i_mutex);
Al Viro2a79f172011-12-09 08:06:57 -0500323 mnt_drop_write_file(filp);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700324 return err;
325 }
Mingming Cao617ba132006-10-11 01:20:53 -0700326 case EXT4_IOC_GETVERSION:
327 case EXT4_IOC_GETVERSION_OLD:
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700328 return put_user(inode->i_generation, (int __user *) arg);
Mingming Cao617ba132006-10-11 01:20:53 -0700329 case EXT4_IOC_SETVERSION:
330 case EXT4_IOC_SETVERSION_OLD: {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700331 handle_t *handle;
Mingming Cao617ba132006-10-11 01:20:53 -0700332 struct ext4_iloc iloc;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700333 __u32 generation;
334 int err;
335
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700336 if (!inode_owner_or_capable(inode))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700337 return -EPERM;
Dave Hansen42a74f22008-02-15 14:37:46 -0800338
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400339 if (ext4_has_metadata_csum(inode->i_sb)) {
Darrick J. Wong814525f2012-04-29 18:31:10 -0400340 ext4_warning(sb, "Setting inode version is not "
341 "supported with metadata_csum enabled.");
342 return -ENOTTY;
343 }
344
Al Viroa561be72011-11-23 11:57:51 -0500345 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800346 if (err)
347 return err;
348 if (get_user(generation, (int __user *) arg)) {
349 err = -EFAULT;
350 goto setversion_out;
351 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700352
Djalal Harouni6c2155b2012-01-03 02:31:52 +0100353 mutex_lock(&inode->i_mutex);
Theodore Ts'o9924a922013-02-08 21:59:22 -0500354 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Dave Hansen42a74f22008-02-15 14:37:46 -0800355 if (IS_ERR(handle)) {
356 err = PTR_ERR(handle);
Djalal Harouni6c2155b2012-01-03 02:31:52 +0100357 goto unlock_out;
Dave Hansen42a74f22008-02-15 14:37:46 -0800358 }
Mingming Cao617ba132006-10-11 01:20:53 -0700359 err = ext4_reserve_inode_write(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700360 if (err == 0) {
Kalpak Shahef7f3832007-07-18 09:15:20 -0400361 inode->i_ctime = ext4_current_time(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700362 inode->i_generation = generation;
Mingming Cao617ba132006-10-11 01:20:53 -0700363 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700364 }
Mingming Cao617ba132006-10-11 01:20:53 -0700365 ext4_journal_stop(handle);
Djalal Harouni6c2155b2012-01-03 02:31:52 +0100366
367unlock_out:
368 mutex_unlock(&inode->i_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -0800369setversion_out:
Al Viro2a79f172011-12-09 08:06:57 -0500370 mnt_drop_write_file(filp);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700371 return err;
372 }
Mingming Cao617ba132006-10-11 01:20:53 -0700373 case EXT4_IOC_GROUP_EXTEND: {
374 ext4_fsblk_t n_blocks_count;
Peng Taoac046f12009-07-13 09:30:17 -0400375 int err, err2=0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700376
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400377 err = ext4_resize_begin(sb);
378 if (err)
379 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700380
Djalal Harouni014a1772012-01-04 17:09:52 -0500381 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
382 err = -EFAULT;
383 goto group_extend_out;
384 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700385
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400386 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
387 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
388 ext4_msg(sb, KERN_ERR,
389 "Online resizing not supported with bigalloc");
Djalal Harouni014a1772012-01-04 17:09:52 -0500390 err = -EOPNOTSUPP;
391 goto group_extend_out;
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400392 }
393
Al Viroa561be72011-11-23 11:57:51 -0500394 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800395 if (err)
Djalal Harouni014a1772012-01-04 17:09:52 -0500396 goto group_extend_out;
Dave Hansen42a74f22008-02-15 14:37:46 -0800397
Mingming Cao617ba132006-10-11 01:20:53 -0700398 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
Peng Taoac046f12009-07-13 09:30:17 -0400399 if (EXT4_SB(sb)->s_journal) {
400 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
401 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
402 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
403 }
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -0400404 if (err == 0)
405 err = err2;
Al Viro2a79f172011-12-09 08:06:57 -0500406 mnt_drop_write_file(filp);
Djalal Harouni014a1772012-01-04 17:09:52 -0500407group_extend_out:
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400408 ext4_resize_end(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700409 return err;
410 }
Akira Fujita748de672009-06-17 19:24:03 -0400411
412 case EXT4_IOC_MOVE_EXT: {
413 struct move_extent me;
Al Viro2903ff02012-08-28 12:52:22 -0400414 struct fd donor;
415 int err;
Akira Fujita748de672009-06-17 19:24:03 -0400416
Akira Fujita4a585792009-12-06 23:38:31 -0500417 if (!(filp->f_mode & FMODE_READ) ||
418 !(filp->f_mode & FMODE_WRITE))
419 return -EBADF;
420
Akira Fujita748de672009-06-17 19:24:03 -0400421 if (copy_from_user(&me,
422 (struct move_extent __user *)arg, sizeof(me)))
423 return -EFAULT;
Akira Fujita4a585792009-12-06 23:38:31 -0500424 me.moved_len = 0;
Akira Fujita748de672009-06-17 19:24:03 -0400425
Al Viro2903ff02012-08-28 12:52:22 -0400426 donor = fdget(me.donor_fd);
427 if (!donor.file)
Akira Fujita748de672009-06-17 19:24:03 -0400428 return -EBADF;
429
Al Viro2903ff02012-08-28 12:52:22 -0400430 if (!(donor.file->f_mode & FMODE_WRITE)) {
Akira Fujita4a585792009-12-06 23:38:31 -0500431 err = -EBADF;
432 goto mext_out;
Akira Fujita748de672009-06-17 19:24:03 -0400433 }
434
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400435 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
436 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
437 ext4_msg(sb, KERN_ERR,
438 "Online defrag not supported with bigalloc");
Al Viro399c9b82012-08-26 21:00:03 -0400439 err = -EOPNOTSUPP;
440 goto mext_out;
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400441 }
442
Al Viroa561be72011-11-23 11:57:51 -0500443 err = mnt_want_write_file(filp);
Akira Fujita4a585792009-12-06 23:38:31 -0500444 if (err)
445 goto mext_out;
446
Al Viro2903ff02012-08-28 12:52:22 -0400447 err = ext4_move_extents(filp, donor.file, me.orig_start,
Akira Fujita748de672009-06-17 19:24:03 -0400448 me.donor_start, me.len, &me.moved_len);
Al Viro2a79f172011-12-09 08:06:57 -0500449 mnt_drop_write_file(filp);
Akira Fujita748de672009-06-17 19:24:03 -0400450
Theodore Ts'o60e66792010-05-17 07:00:00 -0400451 if (copy_to_user((struct move_extent __user *)arg,
Akira Fujitac437b272010-03-04 00:39:24 -0500452 &me, sizeof(me)))
Akira Fujita4a585792009-12-06 23:38:31 -0500453 err = -EFAULT;
454mext_out:
Al Viro2903ff02012-08-28 12:52:22 -0400455 fdput(donor);
Akira Fujita748de672009-06-17 19:24:03 -0400456 return err;
457 }
458
Mingming Cao617ba132006-10-11 01:20:53 -0700459 case EXT4_IOC_GROUP_ADD: {
460 struct ext4_new_group_data input;
Peng Taoac046f12009-07-13 09:30:17 -0400461 int err, err2=0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700462
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400463 err = ext4_resize_begin(sb);
464 if (err)
465 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700466
Mingming Cao617ba132006-10-11 01:20:53 -0700467 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
Djalal Harouni014a1772012-01-04 17:09:52 -0500468 sizeof(input))) {
469 err = -EFAULT;
470 goto group_add_out;
471 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700472
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400473 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
474 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
475 ext4_msg(sb, KERN_ERR,
476 "Online resizing not supported with bigalloc");
Djalal Harouni014a1772012-01-04 17:09:52 -0500477 err = -EOPNOTSUPP;
478 goto group_add_out;
Theodore Ts'obab08ab2011-09-09 18:36:51 -0400479 }
480
Al Viroa561be72011-11-23 11:57:51 -0500481 err = mnt_want_write_file(filp);
Dave Hansen42a74f22008-02-15 14:37:46 -0800482 if (err)
Djalal Harouni014a1772012-01-04 17:09:52 -0500483 goto group_add_out;
Dave Hansen42a74f22008-02-15 14:37:46 -0800484
Mingming Cao617ba132006-10-11 01:20:53 -0700485 err = ext4_group_add(sb, &input);
Peng Taoac046f12009-07-13 09:30:17 -0400486 if (EXT4_SB(sb)->s_journal) {
487 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
488 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
489 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
490 }
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -0400491 if (err == 0)
492 err = err2;
Al Viro2a79f172011-12-09 08:06:57 -0500493 mnt_drop_write_file(filp);
Theodore Ts'o7f511862013-01-13 08:41:45 -0500494 if (!err && ext4_has_group_desc_csum(sb) &&
495 test_opt(sb, INIT_INODE_TABLE))
496 err = ext4_register_li_request(sb, input.group);
Djalal Harouni014a1772012-01-04 17:09:52 -0500497group_add_out:
Yongqiang Yang8f82f842011-07-26 21:35:44 -0400498 ext4_resize_end(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700499 return err;
500 }
501
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500502 case EXT4_IOC_MIGRATE:
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400503 {
504 int err;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700505 if (!inode_owner_or_capable(inode))
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400506 return -EACCES;
507
Al Viroa561be72011-11-23 11:57:51 -0500508 err = mnt_want_write_file(filp);
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400509 if (err)
510 return err;
511 /*
512 * inode_mutex prevent write and truncate on the file.
513 * Read still goes through. We take i_data_sem in
514 * ext4_ext_swap_inode_data before we switch the
515 * inode format to prevent read.
516 */
517 mutex_lock(&(inode->i_mutex));
518 err = ext4_ext_migrate(inode);
519 mutex_unlock(&(inode->i_mutex));
Al Viro2a79f172011-12-09 08:06:57 -0500520 mnt_drop_write_file(filp);
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400521 return err;
522 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500523
Theodore Ts'occd25062009-02-26 01:04:07 -0500524 case EXT4_IOC_ALLOC_DA_BLKS:
525 {
526 int err;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700527 if (!inode_owner_or_capable(inode))
Theodore Ts'occd25062009-02-26 01:04:07 -0500528 return -EACCES;
529
Al Viroa561be72011-11-23 11:57:51 -0500530 err = mnt_want_write_file(filp);
Theodore Ts'occd25062009-02-26 01:04:07 -0500531 if (err)
532 return err;
533 err = ext4_alloc_da_blocks(inode);
Al Viro2a79f172011-12-09 08:06:57 -0500534 mnt_drop_write_file(filp);
Theodore Ts'occd25062009-02-26 01:04:07 -0500535 return err;
536 }
537
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400538 case EXT4_IOC_SWAP_BOOT:
Dmitry Monakhov3e67cfad22014-10-03 12:47:23 -0400539 {
540 int err;
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400541 if (!(filp->f_mode & FMODE_WRITE))
542 return -EBADF;
Dmitry Monakhov3e67cfad22014-10-03 12:47:23 -0400543 err = mnt_want_write_file(filp);
544 if (err)
545 return err;
546 err = swap_inode_boot_loader(sb, inode);
547 mnt_drop_write_file(filp);
548 return err;
549 }
Dr. Tilmann Bubeck393d1d12013-04-08 12:54:05 -0400550
Yongqiang Yang19c52462012-01-04 17:09:44 -0500551 case EXT4_IOC_RESIZE_FS: {
552 ext4_fsblk_t n_blocks_count;
Yongqiang Yang19c52462012-01-04 17:09:44 -0500553 int err = 0, err2 = 0;
Theodore Ts'o7f511862013-01-13 08:41:45 -0500554 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
Yongqiang Yang19c52462012-01-04 17:09:44 -0500555
556 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
557 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
558 ext4_msg(sb, KERN_ERR,
559 "Online resizing not (yet) supported with bigalloc");
560 return -EOPNOTSUPP;
561 }
562
Yongqiang Yang19c52462012-01-04 17:09:44 -0500563 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
564 sizeof(__u64))) {
565 return -EFAULT;
566 }
567
Yongqiang Yang19c52462012-01-04 17:09:44 -0500568 err = ext4_resize_begin(sb);
569 if (err)
570 return err;
571
Al Viro8cae6f72012-07-19 11:19:07 +0400572 err = mnt_want_write_file(filp);
Yongqiang Yang19c52462012-01-04 17:09:44 -0500573 if (err)
574 goto resizefs_out;
575
576 err = ext4_resize_fs(sb, n_blocks_count);
577 if (EXT4_SB(sb)->s_journal) {
578 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
579 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
580 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
581 }
582 if (err == 0)
583 err = err2;
Al Viro8cae6f72012-07-19 11:19:07 +0400584 mnt_drop_write_file(filp);
Theodore Ts'o7f511862013-01-13 08:41:45 -0500585 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
586 ext4_has_group_desc_csum(sb) &&
587 test_opt(sb, INIT_INODE_TABLE))
588 err = ext4_register_li_request(sb, o_group);
589
Yongqiang Yang19c52462012-01-04 17:09:44 -0500590resizefs_out:
591 ext4_resize_end(sb);
592 return err;
593 }
594
Lukas Czernere681c042010-11-19 21:47:07 -0500595 case FITRIM:
596 {
Lukas Czerner41431792011-02-23 12:42:32 -0500597 struct request_queue *q = bdev_get_queue(sb->s_bdev);
Lukas Czernere681c042010-11-19 21:47:07 -0500598 struct fstrim_range range;
599 int ret = 0;
600
601 if (!capable(CAP_SYS_ADMIN))
602 return -EPERM;
603
Lukas Czerner41431792011-02-23 12:42:32 -0500604 if (!blk_queue_discard(q))
605 return -EOPNOTSUPP;
606
H Hartley Sweetene6705f72011-10-18 10:59:51 -0400607 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
Lukas Czernere681c042010-11-19 21:47:07 -0500608 sizeof(range)))
609 return -EFAULT;
610
Lukas Czerner5c2ed622011-02-23 17:49:51 -0500611 range.minlen = max((unsigned int)range.minlen,
612 q->limits.discard_granularity);
Lukas Czernere681c042010-11-19 21:47:07 -0500613 ret = ext4_trim_fs(sb, &range);
614 if (ret < 0)
615 return ret;
616
H Hartley Sweetene6705f72011-10-18 10:59:51 -0400617 if (copy_to_user((struct fstrim_range __user *)arg, &range,
Lukas Czernere681c042010-11-19 21:47:07 -0500618 sizeof(range)))
619 return -EFAULT;
620
621 return 0;
622 }
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400623 case EXT4_IOC_PRECACHE_EXTENTS:
624 return ext4_ext_precache(inode);
Michael Halcrow9bd82122015-04-11 07:48:01 -0400625 case EXT4_IOC_SET_ENCRYPTION_POLICY: {
626#ifdef CONFIG_EXT4_FS_ENCRYPTION
627 struct ext4_encryption_policy policy;
628 int err = 0;
Lukas Czernere681c042010-11-19 21:47:07 -0500629
Michael Halcrow9bd82122015-04-11 07:48:01 -0400630 if (copy_from_user(&policy,
631 (struct ext4_encryption_policy __user *)arg,
632 sizeof(policy))) {
633 err = -EFAULT;
634 goto encryption_policy_out;
635 }
636
637 err = ext4_process_policy(&policy, inode);
638encryption_policy_out:
639 return err;
640#else
641 return -EOPNOTSUPP;
642#endif
643 }
644 case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
645 int err, err2;
646 struct ext4_sb_info *sbi = EXT4_SB(sb);
647 handle_t *handle;
648
649 if (!ext4_sb_has_crypto(sb))
650 return -EOPNOTSUPP;
651 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
652 err = mnt_want_write_file(filp);
653 if (err)
654 return err;
655 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
656 if (IS_ERR(handle)) {
657 err = PTR_ERR(handle);
658 goto pwsalt_err_exit;
659 }
660 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
661 if (err)
662 goto pwsalt_err_journal;
663 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
664 err = ext4_handle_dirty_metadata(handle, NULL,
665 sbi->s_sbh);
666 pwsalt_err_journal:
667 err2 = ext4_journal_stop(handle);
668 if (err2 && !err)
669 err = err2;
670 pwsalt_err_exit:
671 mnt_drop_write_file(filp);
672 if (err)
673 return err;
674 }
Fabian Frederickb4ab9e22015-06-08 12:23:21 -0400675 if (copy_to_user((void __user *) arg,
676 sbi->s_es->s_encrypt_pw_salt, 16))
Michael Halcrow9bd82122015-04-11 07:48:01 -0400677 return -EFAULT;
678 return 0;
679 }
680 case EXT4_IOC_GET_ENCRYPTION_POLICY: {
681#ifdef CONFIG_EXT4_FS_ENCRYPTION
682 struct ext4_encryption_policy policy;
683 int err = 0;
684
685 if (!ext4_encrypted_inode(inode))
686 return -ENOENT;
687 err = ext4_get_policy(inode, &policy);
688 if (err)
689 return err;
Fabian Frederickb4ab9e22015-06-08 12:23:21 -0400690 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
Michael Halcrow9bd82122015-04-11 07:48:01 -0400691 return -EFAULT;
692 return 0;
693#else
694 return -EOPNOTSUPP;
695#endif
696 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700697 default:
698 return -ENOTTY;
699 }
700}
701
702#ifdef CONFIG_COMPAT
Mingming Cao617ba132006-10-11 01:20:53 -0700703long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700704{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700705 /* These are just misnamed, they actually get/put from/to user an int */
706 switch (cmd) {
Mingming Cao617ba132006-10-11 01:20:53 -0700707 case EXT4_IOC32_GETFLAGS:
708 cmd = EXT4_IOC_GETFLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700709 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700710 case EXT4_IOC32_SETFLAGS:
711 cmd = EXT4_IOC_SETFLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700712 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700713 case EXT4_IOC32_GETVERSION:
714 cmd = EXT4_IOC_GETVERSION;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700715 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700716 case EXT4_IOC32_SETVERSION:
717 cmd = EXT4_IOC_SETVERSION;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700718 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700719 case EXT4_IOC32_GROUP_EXTEND:
720 cmd = EXT4_IOC_GROUP_EXTEND;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700721 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700722 case EXT4_IOC32_GETVERSION_OLD:
723 cmd = EXT4_IOC_GETVERSION_OLD;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700724 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700725 case EXT4_IOC32_SETVERSION_OLD:
726 cmd = EXT4_IOC_SETVERSION_OLD;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700727 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700728 case EXT4_IOC32_GETRSVSZ:
729 cmd = EXT4_IOC_GETRSVSZ;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700730 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700731 case EXT4_IOC32_SETRSVSZ:
732 cmd = EXT4_IOC_SETRSVSZ;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700733 break;
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400734 case EXT4_IOC32_GROUP_ADD: {
735 struct compat_ext4_new_group_input __user *uinput;
736 struct ext4_new_group_input input;
737 mm_segment_t old_fs;
738 int err;
739
740 uinput = compat_ptr(arg);
741 err = get_user(input.group, &uinput->group);
742 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
743 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
744 err |= get_user(input.inode_table, &uinput->inode_table);
745 err |= get_user(input.blocks_count, &uinput->blocks_count);
746 err |= get_user(input.reserved_blocks,
747 &uinput->reserved_blocks);
748 if (err)
749 return -EFAULT;
750 old_fs = get_fs();
751 set_fs(KERNEL_DS);
752 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
753 (unsigned long) &input);
754 set_fs(old_fs);
755 return err;
756 }
Christian Borntraegerb684b2e2010-05-15 00:00:00 -0400757 case EXT4_IOC_MOVE_EXT:
Yongqiang Yang19c52462012-01-04 17:09:44 -0500758 case EXT4_IOC_RESIZE_FS:
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400759 case EXT4_IOC_PRECACHE_EXTENTS:
Michael Halcrow9bd82122015-04-11 07:48:01 -0400760 case EXT4_IOC_SET_ENCRYPTION_POLICY:
761 case EXT4_IOC_GET_ENCRYPTION_PWSALT:
762 case EXT4_IOC_GET_ENCRYPTION_POLICY:
Christian Borntraegerb684b2e2010-05-15 00:00:00 -0400763 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700764 default:
765 return -ENOIOCTLCMD;
766 }
Andi Kleen5cdd7b22008-04-29 22:03:54 -0400767 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700768}
769#endif