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ioctl.c
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1 /*
2  * linux/fs/ext3/ioctl.c
3  *
4  * Copyright (C) 1993, 1994, 1995
5  * Remy Card ([email protected])
6  * Laboratoire MASI - Institut Blaise Pascal
7  * Universite Pierre et Marie Curie (Paris VI)
8  */
9 
10 #include <linux/mount.h>
11 #include <linux/compat.h>
12 #include <asm/uaccess.h>
13 #include "ext3.h"
14 
15 long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
16 {
17  struct inode *inode = filp->f_dentry->d_inode;
18  struct ext3_inode_info *ei = EXT3_I(inode);
19  unsigned int flags;
20  unsigned short rsv_window_size;
21 
22  ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
23 
24  switch (cmd) {
25  case EXT3_IOC_GETFLAGS:
26  ext3_get_inode_flags(ei);
27  flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
28  return put_user(flags, (int __user *) arg);
29  case EXT3_IOC_SETFLAGS: {
30  handle_t *handle = NULL;
31  int err;
32  struct ext3_iloc iloc;
33  unsigned int oldflags;
34  unsigned int jflag;
35 
36  if (!inode_owner_or_capable(inode))
37  return -EACCES;
38 
39  if (get_user(flags, (int __user *) arg))
40  return -EFAULT;
41 
42  err = mnt_want_write_file(filp);
43  if (err)
44  return err;
45 
46  flags = ext3_mask_flags(inode->i_mode, flags);
47 
48  mutex_lock(&inode->i_mutex);
49 
50  /* Is it quota file? Do not allow user to mess with it */
51  err = -EPERM;
52  if (IS_NOQUOTA(inode))
53  goto flags_out;
54 
55  oldflags = ei->i_flags;
56 
57  /* The JOURNAL_DATA flag is modifiable only by root */
58  jflag = flags & EXT3_JOURNAL_DATA_FL;
59 
60  /*
61  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
62  * the relevant capability.
63  *
64  * This test looks nicer. Thanks to Pauline Middelink
65  */
66  if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
67  if (!capable(CAP_LINUX_IMMUTABLE))
68  goto flags_out;
69  }
70 
71  /*
72  * The JOURNAL_DATA flag can only be changed by
73  * the relevant capability.
74  */
75  if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
76  if (!capable(CAP_SYS_RESOURCE))
77  goto flags_out;
78  }
79 
80  handle = ext3_journal_start(inode, 1);
81  if (IS_ERR(handle)) {
82  err = PTR_ERR(handle);
83  goto flags_out;
84  }
85  if (IS_SYNC(inode))
86  handle->h_sync = 1;
87  err = ext3_reserve_inode_write(handle, inode, &iloc);
88  if (err)
89  goto flags_err;
90 
91  flags = flags & EXT3_FL_USER_MODIFIABLE;
92  flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
93  ei->i_flags = flags;
94 
95  ext3_set_inode_flags(inode);
96  inode->i_ctime = CURRENT_TIME_SEC;
97 
98  err = ext3_mark_iloc_dirty(handle, inode, &iloc);
99 flags_err:
100  ext3_journal_stop(handle);
101  if (err)
102  goto flags_out;
103 
104  if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
105  err = ext3_change_inode_journal_flag(inode, jflag);
106 flags_out:
107  mutex_unlock(&inode->i_mutex);
108  mnt_drop_write_file(filp);
109  return err;
110  }
111  case EXT3_IOC_GETVERSION:
112  case EXT3_IOC_GETVERSION_OLD:
113  return put_user(inode->i_generation, (int __user *) arg);
114  case EXT3_IOC_SETVERSION:
115  case EXT3_IOC_SETVERSION_OLD: {
116  handle_t *handle;
117  struct ext3_iloc iloc;
118  __u32 generation;
119  int err;
120 
121  if (!inode_owner_or_capable(inode))
122  return -EPERM;
123 
124  err = mnt_want_write_file(filp);
125  if (err)
126  return err;
127  if (get_user(generation, (int __user *) arg)) {
128  err = -EFAULT;
129  goto setversion_out;
130  }
131 
132  mutex_lock(&inode->i_mutex);
133  handle = ext3_journal_start(inode, 1);
134  if (IS_ERR(handle)) {
135  err = PTR_ERR(handle);
136  goto unlock_out;
137  }
138  err = ext3_reserve_inode_write(handle, inode, &iloc);
139  if (err == 0) {
140  inode->i_ctime = CURRENT_TIME_SEC;
141  inode->i_generation = generation;
142  err = ext3_mark_iloc_dirty(handle, inode, &iloc);
143  }
144  ext3_journal_stop(handle);
145 
146 unlock_out:
147  mutex_unlock(&inode->i_mutex);
148 setversion_out:
149  mnt_drop_write_file(filp);
150  return err;
151  }
152  case EXT3_IOC_GETRSVSZ:
153  if (test_opt(inode->i_sb, RESERVATION)
154  && S_ISREG(inode->i_mode)
155  && ei->i_block_alloc_info) {
156  rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
157  return put_user(rsv_window_size, (int __user *)arg);
158  }
159  return -ENOTTY;
160  case EXT3_IOC_SETRSVSZ: {
161  int err;
162 
163  if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
164  return -ENOTTY;
165 
166  err = mnt_want_write_file(filp);
167  if (err)
168  return err;
169 
170  if (!inode_owner_or_capable(inode)) {
171  err = -EACCES;
172  goto setrsvsz_out;
173  }
174 
175  if (get_user(rsv_window_size, (int __user *)arg)) {
176  err = -EFAULT;
177  goto setrsvsz_out;
178  }
179 
180  if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
181  rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
182 
183  /*
184  * need to allocate reservation structure for this inode
185  * before set the window size
186  */
187  mutex_lock(&ei->truncate_mutex);
188  if (!ei->i_block_alloc_info)
189  ext3_init_block_alloc_info(inode);
190 
191  if (ei->i_block_alloc_info){
192  struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
193  rsv->rsv_goal_size = rsv_window_size;
194  }
195  mutex_unlock(&ei->truncate_mutex);
196 setrsvsz_out:
197  mnt_drop_write_file(filp);
198  return err;
199  }
200  case EXT3_IOC_GROUP_EXTEND: {
201  ext3_fsblk_t n_blocks_count;
202  struct super_block *sb = inode->i_sb;
203  int err, err2;
204 
205  if (!capable(CAP_SYS_RESOURCE))
206  return -EPERM;
207 
208  err = mnt_want_write_file(filp);
209  if (err)
210  return err;
211 
212  if (get_user(n_blocks_count, (__u32 __user *)arg)) {
213  err = -EFAULT;
214  goto group_extend_out;
215  }
216  err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
217  journal_lock_updates(EXT3_SB(sb)->s_journal);
218  err2 = journal_flush(EXT3_SB(sb)->s_journal);
219  journal_unlock_updates(EXT3_SB(sb)->s_journal);
220  if (err == 0)
221  err = err2;
222 group_extend_out:
223  mnt_drop_write_file(filp);
224  return err;
225  }
226  case EXT3_IOC_GROUP_ADD: {
227  struct ext3_new_group_data input;
228  struct super_block *sb = inode->i_sb;
229  int err, err2;
230 
231  if (!capable(CAP_SYS_RESOURCE))
232  return -EPERM;
233 
234  err = mnt_want_write_file(filp);
235  if (err)
236  return err;
237 
238  if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
239  sizeof(input))) {
240  err = -EFAULT;
241  goto group_add_out;
242  }
243 
244  err = ext3_group_add(sb, &input);
245  journal_lock_updates(EXT3_SB(sb)->s_journal);
246  err2 = journal_flush(EXT3_SB(sb)->s_journal);
247  journal_unlock_updates(EXT3_SB(sb)->s_journal);
248  if (err == 0)
249  err = err2;
250 group_add_out:
251  mnt_drop_write_file(filp);
252  return err;
253  }
254  case FITRIM: {
255 
256  struct super_block *sb = inode->i_sb;
257  struct fstrim_range range;
258  int ret = 0;
259 
260  if (!capable(CAP_SYS_ADMIN))
261  return -EPERM;
262 
263  if (copy_from_user(&range, (struct fstrim_range __user *)arg,
264  sizeof(range)))
265  return -EFAULT;
266 
267  ret = ext3_trim_fs(sb, &range);
268  if (ret < 0)
269  return ret;
270 
271  if (copy_to_user((struct fstrim_range __user *)arg, &range,
272  sizeof(range)))
273  return -EFAULT;
274 
275  return 0;
276  }
277 
278  default:
279  return -ENOTTY;
280  }
281 }
282 
283 #ifdef CONFIG_COMPAT
284 long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
285 {
286  /* These are just misnamed, they actually get/put from/to user an int */
287  switch (cmd) {
288  case EXT3_IOC32_GETFLAGS:
289  cmd = EXT3_IOC_GETFLAGS;
290  break;
291  case EXT3_IOC32_SETFLAGS:
292  cmd = EXT3_IOC_SETFLAGS;
293  break;
294  case EXT3_IOC32_GETVERSION:
295  cmd = EXT3_IOC_GETVERSION;
296  break;
297  case EXT3_IOC32_SETVERSION:
298  cmd = EXT3_IOC_SETVERSION;
299  break;
300  case EXT3_IOC32_GROUP_EXTEND:
301  cmd = EXT3_IOC_GROUP_EXTEND;
302  break;
303  case EXT3_IOC32_GETVERSION_OLD:
304  cmd = EXT3_IOC_GETVERSION_OLD;
305  break;
306  case EXT3_IOC32_SETVERSION_OLD:
307  cmd = EXT3_IOC_SETVERSION_OLD;
308  break;
309 #ifdef CONFIG_JBD_DEBUG
310  case EXT3_IOC32_WAIT_FOR_READONLY:
311  cmd = EXT3_IOC_WAIT_FOR_READONLY;
312  break;
313 #endif
314  case EXT3_IOC32_GETRSVSZ:
315  cmd = EXT3_IOC_GETRSVSZ;
316  break;
317  case EXT3_IOC32_SETRSVSZ:
318  cmd = EXT3_IOC_SETRSVSZ;
319  break;
320  case EXT3_IOC_GROUP_ADD:
321  break;
322  default:
323  return -ENOIOCTLCMD;
324  }
325  return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
326 }
327 #endif
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