2 * linux/fs/ext3/ioctl.c
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)
11 #include <linux/jbd.h>
12 #include <linux/capability.h>
13 #include <linux/ext3_fs.h>
14 #include <linux/ext3_jbd.h>
15 #include <linux/mount.h>
16 #include <linux/time.h>
17 #include <linux/compat.h>
18 #include <linux/smp_lock.h>
19 #include <asm/uaccess.h>
21 int ext3_ioctl (struct inode
* inode
, struct file
* filp
, unsigned int cmd
,
24 struct ext3_inode_info
*ei
= EXT3_I(inode
);
26 unsigned short rsv_window_size
;
28 ext3_debug ("cmd = %u, arg = %lu\n", cmd
, arg
);
31 case EXT3_IOC_GETFLAGS
:
32 ext3_get_inode_flags(ei
);
33 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
;
38 struct ext3_iloc iloc
;
39 unsigned int oldflags
;
42 err
= mnt_want_write(filp
->f_path
.mnt
);
46 if (!is_owner_or_cap(inode
)) {
51 if (get_user(flags
, (int __user
*) arg
)) {
56 if (!S_ISDIR(inode
->i_mode
))
57 flags
&= ~EXT3_DIRSYNC_FL
;
59 mutex_lock(&inode
->i_mutex
);
60 /* Is it quota file? Do not allow user to mess with it */
61 if (IS_NOQUOTA(inode
)) {
62 mutex_unlock(&inode
->i_mutex
);
66 oldflags
= ei
->i_flags
;
68 /* The JOURNAL_DATA flag is modifiable only by root */
69 jflag
= flags
& EXT3_JOURNAL_DATA_FL
;
72 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
73 * the relevant capability.
75 * This test looks nicer. Thanks to Pauline Middelink
77 if ((flags
^ oldflags
) & (EXT3_APPEND_FL
| EXT3_IMMUTABLE_FL
)) {
78 if (!capable(CAP_LINUX_IMMUTABLE
)) {
79 mutex_unlock(&inode
->i_mutex
);
86 * The JOURNAL_DATA flag can only be changed by
87 * the relevant capability.
89 if ((jflag
^ oldflags
) & (EXT3_JOURNAL_DATA_FL
)) {
90 if (!capable(CAP_SYS_RESOURCE
)) {
91 mutex_unlock(&inode
->i_mutex
);
98 handle
= ext3_journal_start(inode
, 1);
100 mutex_unlock(&inode
->i_mutex
);
101 err
= PTR_ERR(handle
);
106 err
= ext3_reserve_inode_write(handle
, inode
, &iloc
);
110 flags
= flags
& EXT3_FL_USER_MODIFIABLE
;
111 flags
|= oldflags
& ~EXT3_FL_USER_MODIFIABLE
;
114 ext3_set_inode_flags(inode
);
115 inode
->i_ctime
= CURRENT_TIME_SEC
;
117 err
= ext3_mark_iloc_dirty(handle
, inode
, &iloc
);
119 ext3_journal_stop(handle
);
121 mutex_unlock(&inode
->i_mutex
);
125 if ((jflag
^ oldflags
) & (EXT3_JOURNAL_DATA_FL
))
126 err
= ext3_change_inode_journal_flag(inode
, jflag
);
127 mutex_unlock(&inode
->i_mutex
);
129 mnt_drop_write(filp
->f_path
.mnt
);
132 case EXT3_IOC_GETVERSION
:
133 case EXT3_IOC_GETVERSION_OLD
:
134 return put_user(inode
->i_generation
, (int __user
*) arg
);
135 case EXT3_IOC_SETVERSION
:
136 case EXT3_IOC_SETVERSION_OLD
: {
138 struct ext3_iloc iloc
;
142 if (!is_owner_or_cap(inode
))
144 err
= mnt_want_write(filp
->f_path
.mnt
);
147 if (get_user(generation
, (int __user
*) arg
)) {
151 handle
= ext3_journal_start(inode
, 1);
152 if (IS_ERR(handle
)) {
153 err
= PTR_ERR(handle
);
156 err
= ext3_reserve_inode_write(handle
, inode
, &iloc
);
158 inode
->i_ctime
= CURRENT_TIME_SEC
;
159 inode
->i_generation
= generation
;
160 err
= ext3_mark_iloc_dirty(handle
, inode
, &iloc
);
162 ext3_journal_stop(handle
);
164 mnt_drop_write(filp
->f_path
.mnt
);
167 #ifdef CONFIG_JBD_DEBUG
168 case EXT3_IOC_WAIT_FOR_READONLY
:
170 * This is racy - by the time we're woken up and running,
171 * the superblock could be released. And the module could
172 * have been unloaded. So sue me.
174 * Returns 1 if it slept, else zero.
177 struct super_block
*sb
= inode
->i_sb
;
178 DECLARE_WAITQUEUE(wait
, current
);
181 set_current_state(TASK_INTERRUPTIBLE
);
182 add_wait_queue(&EXT3_SB(sb
)->ro_wait_queue
, &wait
);
183 if (timer_pending(&EXT3_SB(sb
)->turn_ro_timer
)) {
187 remove_wait_queue(&EXT3_SB(sb
)->ro_wait_queue
, &wait
);
191 case EXT3_IOC_GETRSVSZ
:
192 if (test_opt(inode
->i_sb
, RESERVATION
)
193 && S_ISREG(inode
->i_mode
)
194 && ei
->i_block_alloc_info
) {
195 rsv_window_size
= ei
->i_block_alloc_info
->rsv_window_node
.rsv_goal_size
;
196 return put_user(rsv_window_size
, (int __user
*)arg
);
199 case EXT3_IOC_SETRSVSZ
: {
202 if (!test_opt(inode
->i_sb
, RESERVATION
) ||!S_ISREG(inode
->i_mode
))
205 err
= mnt_want_write(filp
->f_path
.mnt
);
209 if (!is_owner_or_cap(inode
)) {
214 if (get_user(rsv_window_size
, (int __user
*)arg
)) {
219 if (rsv_window_size
> EXT3_MAX_RESERVE_BLOCKS
)
220 rsv_window_size
= EXT3_MAX_RESERVE_BLOCKS
;
223 * need to allocate reservation structure for this inode
224 * before set the window size
226 mutex_lock(&ei
->truncate_mutex
);
227 if (!ei
->i_block_alloc_info
)
228 ext3_init_block_alloc_info(inode
);
230 if (ei
->i_block_alloc_info
){
231 struct ext3_reserve_window_node
*rsv
= &ei
->i_block_alloc_info
->rsv_window_node
;
232 rsv
->rsv_goal_size
= rsv_window_size
;
234 mutex_unlock(&ei
->truncate_mutex
);
236 mnt_drop_write(filp
->f_path
.mnt
);
239 case EXT3_IOC_GROUP_EXTEND
: {
240 ext3_fsblk_t n_blocks_count
;
241 struct super_block
*sb
= inode
->i_sb
;
244 if (!capable(CAP_SYS_RESOURCE
))
247 err
= mnt_want_write(filp
->f_path
.mnt
);
251 if (get_user(n_blocks_count
, (__u32 __user
*)arg
)) {
253 goto group_extend_out
;
255 err
= ext3_group_extend(sb
, EXT3_SB(sb
)->s_es
, n_blocks_count
);
256 journal_lock_updates(EXT3_SB(sb
)->s_journal
);
257 journal_flush(EXT3_SB(sb
)->s_journal
);
258 journal_unlock_updates(EXT3_SB(sb
)->s_journal
);
260 mnt_drop_write(filp
->f_path
.mnt
);
263 case EXT3_IOC_GROUP_ADD
: {
264 struct ext3_new_group_data input
;
265 struct super_block
*sb
= inode
->i_sb
;
268 if (!capable(CAP_SYS_RESOURCE
))
271 err
= mnt_want_write(filp
->f_path
.mnt
);
275 if (copy_from_user(&input
, (struct ext3_new_group_input __user
*)arg
,
281 err
= ext3_group_add(sb
, &input
);
282 journal_lock_updates(EXT3_SB(sb
)->s_journal
);
283 journal_flush(EXT3_SB(sb
)->s_journal
);
284 journal_unlock_updates(EXT3_SB(sb
)->s_journal
);
286 mnt_drop_write(filp
->f_path
.mnt
);
297 long ext3_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
299 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
302 /* These are just misnamed, they actually get/put from/to user an int */
304 case EXT3_IOC32_GETFLAGS
:
305 cmd
= EXT3_IOC_GETFLAGS
;
307 case EXT3_IOC32_SETFLAGS
:
308 cmd
= EXT3_IOC_SETFLAGS
;
310 case EXT3_IOC32_GETVERSION
:
311 cmd
= EXT3_IOC_GETVERSION
;
313 case EXT3_IOC32_SETVERSION
:
314 cmd
= EXT3_IOC_SETVERSION
;
316 case EXT3_IOC32_GROUP_EXTEND
:
317 cmd
= EXT3_IOC_GROUP_EXTEND
;
319 case EXT3_IOC32_GETVERSION_OLD
:
320 cmd
= EXT3_IOC_GETVERSION_OLD
;
322 case EXT3_IOC32_SETVERSION_OLD
:
323 cmd
= EXT3_IOC_SETVERSION_OLD
;
325 #ifdef CONFIG_JBD_DEBUG
326 case EXT3_IOC32_WAIT_FOR_READONLY
:
327 cmd
= EXT3_IOC_WAIT_FOR_READONLY
;
330 case EXT3_IOC32_GETRSVSZ
:
331 cmd
= EXT3_IOC_GETRSVSZ
;
333 case EXT3_IOC32_SETRSVSZ
:
334 cmd
= EXT3_IOC_SETRSVSZ
;
336 case EXT3_IOC_GROUP_ADD
:
342 ret
= ext3_ioctl(inode
, file
, cmd
, (unsigned long) compat_ptr(arg
));