Root/fs/ext3/ioctl.c

1/*
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>
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 <asm/uaccess.h>
19
20long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
21{
22    struct inode *inode = filp->f_dentry->d_inode;
23    struct ext3_inode_info *ei = EXT3_I(inode);
24    unsigned int flags;
25    unsigned short rsv_window_size;
26
27    ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
28
29    switch (cmd) {
30    case EXT3_IOC_GETFLAGS:
31        ext3_get_inode_flags(ei);
32        flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
33        return put_user(flags, (int __user *) arg);
34    case EXT3_IOC_SETFLAGS: {
35        handle_t *handle = NULL;
36        int err;
37        struct ext3_iloc iloc;
38        unsigned int oldflags;
39        unsigned int jflag;
40
41        if (!inode_owner_or_capable(inode))
42            return -EACCES;
43
44        if (get_user(flags, (int __user *) arg))
45            return -EFAULT;
46
47        err = mnt_want_write(filp->f_path.mnt);
48        if (err)
49            return err;
50
51        flags = ext3_mask_flags(inode->i_mode, flags);
52
53        mutex_lock(&inode->i_mutex);
54
55        /* Is it quota file? Do not allow user to mess with it */
56        err = -EPERM;
57        if (IS_NOQUOTA(inode))
58            goto flags_out;
59
60        oldflags = ei->i_flags;
61
62        /* The JOURNAL_DATA flag is modifiable only by root */
63        jflag = flags & EXT3_JOURNAL_DATA_FL;
64
65        /*
66         * The IMMUTABLE and APPEND_ONLY flags can only be changed by
67         * the relevant capability.
68         *
69         * This test looks nicer. Thanks to Pauline Middelink
70         */
71        if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
72            if (!capable(CAP_LINUX_IMMUTABLE))
73                goto flags_out;
74        }
75
76        /*
77         * The JOURNAL_DATA flag can only be changed by
78         * the relevant capability.
79         */
80        if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
81            if (!capable(CAP_SYS_RESOURCE))
82                goto flags_out;
83        }
84
85        handle = ext3_journal_start(inode, 1);
86        if (IS_ERR(handle)) {
87            err = PTR_ERR(handle);
88            goto flags_out;
89        }
90        if (IS_SYNC(inode))
91            handle->h_sync = 1;
92        err = ext3_reserve_inode_write(handle, inode, &iloc);
93        if (err)
94            goto flags_err;
95
96        flags = flags & EXT3_FL_USER_MODIFIABLE;
97        flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
98        ei->i_flags = flags;
99
100        ext3_set_inode_flags(inode);
101        inode->i_ctime = CURRENT_TIME_SEC;
102
103        err = ext3_mark_iloc_dirty(handle, inode, &iloc);
104flags_err:
105        ext3_journal_stop(handle);
106        if (err)
107            goto flags_out;
108
109        if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
110            err = ext3_change_inode_journal_flag(inode, jflag);
111flags_out:
112        mutex_unlock(&inode->i_mutex);
113        mnt_drop_write(filp->f_path.mnt);
114        return err;
115    }
116    case EXT3_IOC_GETVERSION:
117    case EXT3_IOC_GETVERSION_OLD:
118        return put_user(inode->i_generation, (int __user *) arg);
119    case EXT3_IOC_SETVERSION:
120    case EXT3_IOC_SETVERSION_OLD: {
121        handle_t *handle;
122        struct ext3_iloc iloc;
123        __u32 generation;
124        int err;
125
126        if (!inode_owner_or_capable(inode))
127            return -EPERM;
128
129        err = mnt_want_write(filp->f_path.mnt);
130        if (err)
131            return err;
132        if (get_user(generation, (int __user *) arg)) {
133            err = -EFAULT;
134            goto setversion_out;
135        }
136
137        handle = ext3_journal_start(inode, 1);
138        if (IS_ERR(handle)) {
139            err = PTR_ERR(handle);
140            goto setversion_out;
141        }
142        err = ext3_reserve_inode_write(handle, inode, &iloc);
143        if (err == 0) {
144            inode->i_ctime = CURRENT_TIME_SEC;
145            inode->i_generation = generation;
146            err = ext3_mark_iloc_dirty(handle, inode, &iloc);
147        }
148        ext3_journal_stop(handle);
149setversion_out:
150        mnt_drop_write(filp->f_path.mnt);
151        return err;
152    }
153#ifdef CONFIG_JBD_DEBUG
154    case EXT3_IOC_WAIT_FOR_READONLY:
155        /*
156         * This is racy - by the time we're woken up and running,
157         * the superblock could be released. And the module could
158         * have been unloaded. So sue me.
159         *
160         * Returns 1 if it slept, else zero.
161         */
162        {
163            struct super_block *sb = inode->i_sb;
164            DECLARE_WAITQUEUE(wait, current);
165            int ret = 0;
166
167            set_current_state(TASK_INTERRUPTIBLE);
168            add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
169            if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
170                schedule();
171                ret = 1;
172            }
173            remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
174            return ret;
175        }
176#endif
177    case EXT3_IOC_GETRSVSZ:
178        if (test_opt(inode->i_sb, RESERVATION)
179            && S_ISREG(inode->i_mode)
180            && ei->i_block_alloc_info) {
181            rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
182            return put_user(rsv_window_size, (int __user *)arg);
183        }
184        return -ENOTTY;
185    case EXT3_IOC_SETRSVSZ: {
186        int err;
187
188        if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
189            return -ENOTTY;
190
191        err = mnt_want_write(filp->f_path.mnt);
192        if (err)
193            return err;
194
195        if (!inode_owner_or_capable(inode)) {
196            err = -EACCES;
197            goto setrsvsz_out;
198        }
199
200        if (get_user(rsv_window_size, (int __user *)arg)) {
201            err = -EFAULT;
202            goto setrsvsz_out;
203        }
204
205        if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
206            rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
207
208        /*
209         * need to allocate reservation structure for this inode
210         * before set the window size
211         */
212        mutex_lock(&ei->truncate_mutex);
213        if (!ei->i_block_alloc_info)
214            ext3_init_block_alloc_info(inode);
215
216        if (ei->i_block_alloc_info){
217            struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
218            rsv->rsv_goal_size = rsv_window_size;
219        }
220        mutex_unlock(&ei->truncate_mutex);
221setrsvsz_out:
222        mnt_drop_write(filp->f_path.mnt);
223        return err;
224    }
225    case EXT3_IOC_GROUP_EXTEND: {
226        ext3_fsblk_t n_blocks_count;
227        struct super_block *sb = inode->i_sb;
228        int err, err2;
229
230        if (!capable(CAP_SYS_RESOURCE))
231            return -EPERM;
232
233        err = mnt_want_write(filp->f_path.mnt);
234        if (err)
235            return err;
236
237        if (get_user(n_blocks_count, (__u32 __user *)arg)) {
238            err = -EFAULT;
239            goto group_extend_out;
240        }
241        err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
242        journal_lock_updates(EXT3_SB(sb)->s_journal);
243        err2 = journal_flush(EXT3_SB(sb)->s_journal);
244        journal_unlock_updates(EXT3_SB(sb)->s_journal);
245        if (err == 0)
246            err = err2;
247group_extend_out:
248        mnt_drop_write(filp->f_path.mnt);
249        return err;
250    }
251    case EXT3_IOC_GROUP_ADD: {
252        struct ext3_new_group_data input;
253        struct super_block *sb = inode->i_sb;
254        int err, err2;
255
256        if (!capable(CAP_SYS_RESOURCE))
257            return -EPERM;
258
259        err = mnt_want_write(filp->f_path.mnt);
260        if (err)
261            return err;
262
263        if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
264                sizeof(input))) {
265            err = -EFAULT;
266            goto group_add_out;
267        }
268
269        err = ext3_group_add(sb, &input);
270        journal_lock_updates(EXT3_SB(sb)->s_journal);
271        err2 = journal_flush(EXT3_SB(sb)->s_journal);
272        journal_unlock_updates(EXT3_SB(sb)->s_journal);
273        if (err == 0)
274            err = err2;
275group_add_out:
276        mnt_drop_write(filp->f_path.mnt);
277        return err;
278    }
279    case FITRIM: {
280
281        struct super_block *sb = inode->i_sb;
282        struct fstrim_range range;
283        int ret = 0;
284
285        if (!capable(CAP_SYS_ADMIN))
286            return -EPERM;
287
288        if (copy_from_user(&range, (struct fstrim_range *)arg,
289                   sizeof(range)))
290            return -EFAULT;
291
292        ret = ext3_trim_fs(sb, &range);
293        if (ret < 0)
294            return ret;
295
296        if (copy_to_user((struct fstrim_range *)arg, &range,
297                 sizeof(range)))
298            return -EFAULT;
299
300        return 0;
301    }
302
303    default:
304        return -ENOTTY;
305    }
306}
307
308#ifdef CONFIG_COMPAT
309long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
310{
311    /* These are just misnamed, they actually get/put from/to user an int */
312    switch (cmd) {
313    case EXT3_IOC32_GETFLAGS:
314        cmd = EXT3_IOC_GETFLAGS;
315        break;
316    case EXT3_IOC32_SETFLAGS:
317        cmd = EXT3_IOC_SETFLAGS;
318        break;
319    case EXT3_IOC32_GETVERSION:
320        cmd = EXT3_IOC_GETVERSION;
321        break;
322    case EXT3_IOC32_SETVERSION:
323        cmd = EXT3_IOC_SETVERSION;
324        break;
325    case EXT3_IOC32_GROUP_EXTEND:
326        cmd = EXT3_IOC_GROUP_EXTEND;
327        break;
328    case EXT3_IOC32_GETVERSION_OLD:
329        cmd = EXT3_IOC_GETVERSION_OLD;
330        break;
331    case EXT3_IOC32_SETVERSION_OLD:
332        cmd = EXT3_IOC_SETVERSION_OLD;
333        break;
334#ifdef CONFIG_JBD_DEBUG
335    case EXT3_IOC32_WAIT_FOR_READONLY:
336        cmd = EXT3_IOC_WAIT_FOR_READONLY;
337        break;
338#endif
339    case EXT3_IOC32_GETRSVSZ:
340        cmd = EXT3_IOC_GETRSVSZ;
341        break;
342    case EXT3_IOC32_SETRSVSZ:
343        cmd = EXT3_IOC_SETRSVSZ;
344        break;
345    case EXT3_IOC_GROUP_ADD:
346        break;
347    default:
348        return -ENOIOCTLCMD;
349    }
350    return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
351}
352#endif
353

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