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 <asm/uaccess.h>
20 long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
22 struct inode *inode = filp->f_dentry->d_inode;
23 struct ext3_inode_info *ei = EXT3_I(inode);
25 unsigned short rsv_window_size;
27 ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
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;
37 struct ext3_iloc iloc;
38 unsigned int oldflags;
41 if (!inode_owner_or_capable(inode))
44 if (get_user(flags, (int __user *) arg))
47 err = mnt_want_write_file(filp);
51 flags = ext3_mask_flags(inode->i_mode, flags);
53 mutex_lock(&inode->i_mutex);
55 /* Is it quota file? Do not allow user to mess with it */
57 if (IS_NOQUOTA(inode))
60 oldflags = ei->i_flags;
62 /* The JOURNAL_DATA flag is modifiable only by root */
63 jflag = flags & EXT3_JOURNAL_DATA_FL;
66 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
67 * the relevant capability.
69 * This test looks nicer. Thanks to Pauline Middelink
71 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
72 if (!capable(CAP_LINUX_IMMUTABLE))
77 * The JOURNAL_DATA flag can only be changed by
78 * the relevant capability.
80 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
81 if (!capable(CAP_SYS_RESOURCE))
85 handle = ext3_journal_start(inode, 1);
87 err = PTR_ERR(handle);
92 err = ext3_reserve_inode_write(handle, inode, &iloc);
96 flags = flags & EXT3_FL_USER_MODIFIABLE;
97 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
100 ext3_set_inode_flags(inode);
101 inode->i_ctime = CURRENT_TIME_SEC;
103 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
105 ext3_journal_stop(handle);
109 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
110 err = ext3_change_inode_journal_flag(inode, jflag);
112 mutex_unlock(&inode->i_mutex);
113 mnt_drop_write(filp->f_path.mnt);
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: {
122 struct ext3_iloc iloc;
126 if (!inode_owner_or_capable(inode))
129 err = mnt_want_write_file(filp);
132 if (get_user(generation, (int __user *) arg)) {
137 handle = ext3_journal_start(inode, 1);
138 if (IS_ERR(handle)) {
139 err = PTR_ERR(handle);
142 err = ext3_reserve_inode_write(handle, inode, &iloc);
144 inode->i_ctime = CURRENT_TIME_SEC;
145 inode->i_generation = generation;
146 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
148 ext3_journal_stop(handle);
150 mnt_drop_write(filp->f_path.mnt);
153 case EXT3_IOC_GETRSVSZ:
154 if (test_opt(inode->i_sb, RESERVATION)
155 && S_ISREG(inode->i_mode)
156 && ei->i_block_alloc_info) {
157 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
158 return put_user(rsv_window_size, (int __user *)arg);
161 case EXT3_IOC_SETRSVSZ: {
164 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
167 err = mnt_want_write_file(filp);
171 if (!inode_owner_or_capable(inode)) {
176 if (get_user(rsv_window_size, (int __user *)arg)) {
181 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
182 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
185 * need to allocate reservation structure for this inode
186 * before set the window size
188 mutex_lock(&ei->truncate_mutex);
189 if (!ei->i_block_alloc_info)
190 ext3_init_block_alloc_info(inode);
192 if (ei->i_block_alloc_info){
193 struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
194 rsv->rsv_goal_size = rsv_window_size;
196 mutex_unlock(&ei->truncate_mutex);
198 mnt_drop_write(filp->f_path.mnt);
201 case EXT3_IOC_GROUP_EXTEND: {
202 ext3_fsblk_t n_blocks_count;
203 struct super_block *sb = inode->i_sb;
206 if (!capable(CAP_SYS_RESOURCE))
209 err = mnt_want_write_file(filp);
213 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
215 goto group_extend_out;
217 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
218 journal_lock_updates(EXT3_SB(sb)->s_journal);
219 err2 = journal_flush(EXT3_SB(sb)->s_journal);
220 journal_unlock_updates(EXT3_SB(sb)->s_journal);
224 mnt_drop_write(filp->f_path.mnt);
227 case EXT3_IOC_GROUP_ADD: {
228 struct ext3_new_group_data input;
229 struct super_block *sb = inode->i_sb;
232 if (!capable(CAP_SYS_RESOURCE))
235 err = mnt_want_write_file(filp);
239 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
245 err = ext3_group_add(sb, &input);
246 journal_lock_updates(EXT3_SB(sb)->s_journal);
247 err2 = journal_flush(EXT3_SB(sb)->s_journal);
248 journal_unlock_updates(EXT3_SB(sb)->s_journal);
252 mnt_drop_write(filp->f_path.mnt);
257 struct super_block *sb = inode->i_sb;
258 struct fstrim_range range;
261 if (!capable(CAP_SYS_ADMIN))
264 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
268 ret = ext3_trim_fs(sb, &range);
272 if (copy_to_user((struct fstrim_range __user *)arg, &range,
285 long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
287 /* These are just misnamed, they actually get/put from/to user an int */
289 case EXT3_IOC32_GETFLAGS:
290 cmd = EXT3_IOC_GETFLAGS;
292 case EXT3_IOC32_SETFLAGS:
293 cmd = EXT3_IOC_SETFLAGS;
295 case EXT3_IOC32_GETVERSION:
296 cmd = EXT3_IOC_GETVERSION;
298 case EXT3_IOC32_SETVERSION:
299 cmd = EXT3_IOC_SETVERSION;
301 case EXT3_IOC32_GROUP_EXTEND:
302 cmd = EXT3_IOC_GROUP_EXTEND;
304 case EXT3_IOC32_GETVERSION_OLD:
305 cmd = EXT3_IOC_GETVERSION_OLD;
307 case EXT3_IOC32_SETVERSION_OLD:
308 cmd = EXT3_IOC_SETVERSION_OLD;
310 #ifdef CONFIG_JBD_DEBUG
311 case EXT3_IOC32_WAIT_FOR_READONLY:
312 cmd = EXT3_IOC_WAIT_FOR_READONLY;
315 case EXT3_IOC32_GETRSVSZ:
316 cmd = EXT3_IOC_GETRSVSZ;
318 case EXT3_IOC32_SETRSVSZ:
319 cmd = EXT3_IOC_SETRSVSZ;
321 case EXT3_IOC_GROUP_ADD:
326 return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));