blob: 5e86ce9a86e05b20d3ffe297dd4b9191fee08994 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext3/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/jbd.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080012#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/ext3_fs.h>
14#include <linux/ext3_jbd.h>
Dave Hansen42a74f22008-02-15 14:37:46 -080015#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/time.h>
David Howells52a700c2006-08-29 19:06:23 +010017#include <linux/compat.h>
18#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/uaccess.h>
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
22 unsigned long arg)
23{
24 struct ext3_inode_info *ei = EXT3_I(inode);
25 unsigned int flags;
26 unsigned short rsv_window_size;
27
28 ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
29
30 switch (cmd) {
31 case EXT3_IOC_GETFLAGS:
Jan Kara28be5ab2007-05-08 00:30:33 -070032 ext3_get_inode_flags(ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
34 return put_user(flags, (int __user *) arg);
35 case EXT3_IOC_SETFLAGS: {
36 handle_t *handle = NULL;
37 int err;
38 struct ext3_iloc iloc;
39 unsigned int oldflags;
40 unsigned int jflag;
41
Dave Hansen42a74f22008-02-15 14:37:46 -080042 err = mnt_want_write(filp->f_path.mnt);
43 if (err)
44 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Dave Hansen42a74f22008-02-15 14:37:46 -080046 if (!is_owner_or_cap(inode)) {
47 err = -EACCES;
48 goto flags_out;
49 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Dave Hansen42a74f22008-02-15 14:37:46 -080051 if (get_user(flags, (int __user *) arg)) {
52 err = -EFAULT;
53 goto flags_out;
54 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Duane Griffin04143e22009-01-07 18:07:26 -080056 flags = ext3_mask_flags(inode->i_mode, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Al Viroa090d912006-04-26 07:32:40 +010058 mutex_lock(&inode->i_mutex);
Jan Karae47776a2007-11-14 16:58:56 -080059 /* Is it quota file? Do not allow user to mess with it */
60 if (IS_NOQUOTA(inode)) {
61 mutex_unlock(&inode->i_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -080062 err = -EPERM;
63 goto flags_out;
Jan Karae47776a2007-11-14 16:58:56 -080064 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 oldflags = ei->i_flags;
66
67 /* The JOURNAL_DATA flag is modifiable only by root */
68 jflag = flags & EXT3_JOURNAL_DATA_FL;
69
70 /*
71 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
72 * the relevant capability.
73 *
74 * This test looks nicer. Thanks to Pauline Middelink
75 */
76 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
Al Viroa090d912006-04-26 07:32:40 +010077 if (!capable(CAP_LINUX_IMMUTABLE)) {
78 mutex_unlock(&inode->i_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -080079 err = -EPERM;
80 goto flags_out;
Al Viroa090d912006-04-26 07:32:40 +010081 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 }
83
84 /*
85 * The JOURNAL_DATA flag can only be changed by
86 * the relevant capability.
87 */
88 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
Al Viroa090d912006-04-26 07:32:40 +010089 if (!capable(CAP_SYS_RESOURCE)) {
90 mutex_unlock(&inode->i_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -080091 err = -EPERM;
92 goto flags_out;
Al Viroa090d912006-04-26 07:32:40 +010093 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 }
95
96
97 handle = ext3_journal_start(inode, 1);
Al Viroa090d912006-04-26 07:32:40 +010098 if (IS_ERR(handle)) {
99 mutex_unlock(&inode->i_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -0800100 err = PTR_ERR(handle);
101 goto flags_out;
Al Viroa090d912006-04-26 07:32:40 +0100102 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (IS_SYNC(inode))
104 handle->h_sync = 1;
105 err = ext3_reserve_inode_write(handle, inode, &iloc);
106 if (err)
107 goto flags_err;
108
109 flags = flags & EXT3_FL_USER_MODIFIABLE;
110 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
111 ei->i_flags = flags;
112
113 ext3_set_inode_flags(inode);
114 inode->i_ctime = CURRENT_TIME_SEC;
115
116 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
117flags_err:
118 ext3_journal_stop(handle);
Al Viroa090d912006-04-26 07:32:40 +0100119 if (err) {
120 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return err;
Al Viroa090d912006-04-26 07:32:40 +0100122 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
125 err = ext3_change_inode_journal_flag(inode, jflag);
Al Viroa090d912006-04-26 07:32:40 +0100126 mutex_unlock(&inode->i_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -0800127flags_out:
128 mnt_drop_write(filp->f_path.mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return err;
130 }
131 case EXT3_IOC_GETVERSION:
132 case EXT3_IOC_GETVERSION_OLD:
133 return put_user(inode->i_generation, (int __user *) arg);
134 case EXT3_IOC_SETVERSION:
135 case EXT3_IOC_SETVERSION_OLD: {
136 handle_t *handle;
137 struct ext3_iloc iloc;
138 __u32 generation;
139 int err;
140
Satyam Sharma3bd858a2007-07-17 15:00:08 +0530141 if (!is_owner_or_cap(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return -EPERM;
Dave Hansen42a74f22008-02-15 14:37:46 -0800143 err = mnt_want_write(filp->f_path.mnt);
144 if (err)
145 return err;
146 if (get_user(generation, (int __user *) arg)) {
147 err = -EFAULT;
148 goto setversion_out;
149 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 handle = ext3_journal_start(inode, 1);
Dave Hansen42a74f22008-02-15 14:37:46 -0800151 if (IS_ERR(handle)) {
152 err = PTR_ERR(handle);
153 goto setversion_out;
154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 err = ext3_reserve_inode_write(handle, inode, &iloc);
156 if (err == 0) {
157 inode->i_ctime = CURRENT_TIME_SEC;
158 inode->i_generation = generation;
159 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
160 }
161 ext3_journal_stop(handle);
Dave Hansen42a74f22008-02-15 14:37:46 -0800162setversion_out:
163 mnt_drop_write(filp->f_path.mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 return err;
165 }
166#ifdef CONFIG_JBD_DEBUG
167 case EXT3_IOC_WAIT_FOR_READONLY:
168 /*
169 * This is racy - by the time we're woken up and running,
170 * the superblock could be released. And the module could
171 * have been unloaded. So sue me.
172 *
173 * Returns 1 if it slept, else zero.
174 */
175 {
176 struct super_block *sb = inode->i_sb;
177 DECLARE_WAITQUEUE(wait, current);
178 int ret = 0;
179
180 set_current_state(TASK_INTERRUPTIBLE);
181 add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
182 if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
183 schedule();
184 ret = 1;
185 }
186 remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
187 return ret;
188 }
189#endif
190 case EXT3_IOC_GETRSVSZ:
191 if (test_opt(inode->i_sb, RESERVATION)
192 && S_ISREG(inode->i_mode)
193 && ei->i_block_alloc_info) {
194 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
195 return put_user(rsv_window_size, (int __user *)arg);
196 }
197 return -ENOTTY;
198 case EXT3_IOC_SETRSVSZ: {
Dave Hansen42a74f22008-02-15 14:37:46 -0800199 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
202 return -ENOTTY;
203
Dave Hansen42a74f22008-02-15 14:37:46 -0800204 err = mnt_want_write(filp->f_path.mnt);
205 if (err)
206 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Dave Hansen42a74f22008-02-15 14:37:46 -0800208 if (!is_owner_or_cap(inode)) {
209 err = -EACCES;
210 goto setrsvsz_out;
211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Dave Hansen42a74f22008-02-15 14:37:46 -0800213 if (get_user(rsv_window_size, (int __user *)arg)) {
214 err = -EFAULT;
215 goto setrsvsz_out;
216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
219 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
220
221 /*
222 * need to allocate reservation structure for this inode
223 * before set the window size
224 */
Arjan van de Ven97461512006-03-23 03:00:42 -0800225 mutex_lock(&ei->truncate_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (!ei->i_block_alloc_info)
227 ext3_init_block_alloc_info(inode);
228
229 if (ei->i_block_alloc_info){
230 struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
231 rsv->rsv_goal_size = rsv_window_size;
232 }
Arjan van de Ven97461512006-03-23 03:00:42 -0800233 mutex_unlock(&ei->truncate_mutex);
Dave Hansen42a74f22008-02-15 14:37:46 -0800234setrsvsz_out:
235 mnt_drop_write(filp->f_path.mnt);
236 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 }
238 case EXT3_IOC_GROUP_EXTEND: {
Mingming Cao43d23f92006-06-25 05:48:07 -0700239 ext3_fsblk_t n_blocks_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 struct super_block *sb = inode->i_sb;
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700241 int err, err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 if (!capable(CAP_SYS_RESOURCE))
244 return -EPERM;
245
Dave Hansen42a74f22008-02-15 14:37:46 -0800246 err = mnt_want_write(filp->f_path.mnt);
247 if (err)
248 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Dave Hansen42a74f22008-02-15 14:37:46 -0800250 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
251 err = -EFAULT;
252 goto group_extend_out;
253 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
255 journal_lock_updates(EXT3_SB(sb)->s_journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700256 err2 = journal_flush(EXT3_SB(sb)->s_journal);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 journal_unlock_updates(EXT3_SB(sb)->s_journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700258 if (err == 0)
259 err = err2;
Dave Hansen42a74f22008-02-15 14:37:46 -0800260group_extend_out:
261 mnt_drop_write(filp->f_path.mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 return err;
263 }
264 case EXT3_IOC_GROUP_ADD: {
265 struct ext3_new_group_data input;
266 struct super_block *sb = inode->i_sb;
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700267 int err, err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 if (!capable(CAP_SYS_RESOURCE))
270 return -EPERM;
271
Dave Hansen42a74f22008-02-15 14:37:46 -0800272 err = mnt_want_write(filp->f_path.mnt);
273 if (err)
274 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
276 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
Dave Hansen42a74f22008-02-15 14:37:46 -0800277 sizeof(input))) {
278 err = -EFAULT;
279 goto group_add_out;
280 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282 err = ext3_group_add(sb, &input);
283 journal_lock_updates(EXT3_SB(sb)->s_journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700284 err2 = journal_flush(EXT3_SB(sb)->s_journal);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 journal_unlock_updates(EXT3_SB(sb)->s_journal);
Hidehiro Kawai2d7c8202008-10-22 14:15:01 -0700286 if (err == 0)
287 err = err2;
Dave Hansen42a74f22008-02-15 14:37:46 -0800288group_add_out:
289 mnt_drop_write(filp->f_path.mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 return err;
291 }
292
293
294 default:
295 return -ENOTTY;
296 }
297}
David Howells52a700c2006-08-29 19:06:23 +0100298
299#ifdef CONFIG_COMPAT
300long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
301{
Josef "Jeff" Sipekfe21a692006-12-08 02:36:38 -0800302 struct inode *inode = file->f_path.dentry->d_inode;
David Howells52a700c2006-08-29 19:06:23 +0100303 int ret;
304
305 /* These are just misnamed, they actually get/put from/to user an int */
306 switch (cmd) {
307 case EXT3_IOC32_GETFLAGS:
308 cmd = EXT3_IOC_GETFLAGS;
309 break;
310 case EXT3_IOC32_SETFLAGS:
311 cmd = EXT3_IOC_SETFLAGS;
312 break;
313 case EXT3_IOC32_GETVERSION:
314 cmd = EXT3_IOC_GETVERSION;
315 break;
316 case EXT3_IOC32_SETVERSION:
317 cmd = EXT3_IOC_SETVERSION;
318 break;
319 case EXT3_IOC32_GROUP_EXTEND:
320 cmd = EXT3_IOC_GROUP_EXTEND;
321 break;
322 case EXT3_IOC32_GETVERSION_OLD:
323 cmd = EXT3_IOC_GETVERSION_OLD;
324 break;
325 case EXT3_IOC32_SETVERSION_OLD:
326 cmd = EXT3_IOC_SETVERSION_OLD;
327 break;
328#ifdef CONFIG_JBD_DEBUG
329 case EXT3_IOC32_WAIT_FOR_READONLY:
330 cmd = EXT3_IOC_WAIT_FOR_READONLY;
331 break;
332#endif
333 case EXT3_IOC32_GETRSVSZ:
334 cmd = EXT3_IOC_GETRSVSZ;
335 break;
336 case EXT3_IOC32_SETRSVSZ:
337 cmd = EXT3_IOC_SETRSVSZ;
338 break;
339 case EXT3_IOC_GROUP_ADD:
340 break;
341 default:
342 return -ENOIOCTLCMD;
343 }
344 lock_kernel();
345 ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
346 unlock_kernel();
347 return ret;
348}
349#endif