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/ext3_fs.h>
13 #include <linux/ext3_jbd.h>
14 #include <linux/time.h>
15 #include <linux/vserver/xid.h>
16 #include <asm/uaccess.h>
19 int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
22 struct ext3_inode_info *ei = EXT3_I(inode);
24 unsigned short rsv_window_size;
26 ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
29 case EXT3_IOC_GETFLAGS:
30 flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
31 return put_user(flags, (int *) arg);
32 case EXT3_IOC_SETFLAGS: {
33 handle_t *handle = NULL;
35 struct ext3_iloc iloc;
36 unsigned int oldflags;
42 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
45 if (get_user(flags, (int *) arg))
48 if (!S_ISDIR(inode->i_mode))
49 flags &= ~EXT3_DIRSYNC_FL;
51 oldflags = ei->i_flags;
53 /* The JOURNAL_DATA flag is modifiable only by root */
54 jflag = flags & EXT3_JOURNAL_DATA_FL;
57 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
58 * the relevant capability.
60 * This test looks nicer. Thanks to Pauline Middelink
62 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
63 if (!capable(CAP_LINUX_IMMUTABLE))
68 * The JOURNAL_DATA flag can only be changed by
69 * the relevant capability.
71 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
72 if (!capable(CAP_SYS_RESOURCE))
77 handle = ext3_journal_start(inode, 1);
79 return PTR_ERR(handle);
82 err = ext3_reserve_inode_write(handle, inode, &iloc);
86 flags = flags & EXT3_FL_USER_MODIFIABLE;
87 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
90 ext3_set_inode_flags(inode);
91 inode->i_ctime = CURRENT_TIME;
93 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
95 ext3_journal_stop(handle);
99 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
100 err = ext3_change_inode_journal_flag(inode, jflag);
103 case EXT3_IOC_GETVERSION:
104 case EXT3_IOC_GETVERSION_OLD:
105 return put_user(inode->i_generation, (int *) arg);
106 case EXT3_IOC_SETVERSION:
107 case EXT3_IOC_SETVERSION_OLD: {
109 struct ext3_iloc iloc;
113 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
115 if (IS_RDONLY(inode))
117 if (get_user(generation, (int *) arg))
120 handle = ext3_journal_start(inode, 1);
122 return PTR_ERR(handle);
123 err = ext3_reserve_inode_write(handle, inode, &iloc);
125 inode->i_ctime = CURRENT_TIME;
126 inode->i_generation = generation;
127 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
129 ext3_journal_stop(handle);
132 #ifdef CONFIG_JBD_DEBUG
133 case EXT3_IOC_WAIT_FOR_READONLY:
135 * This is racy - by the time we're woken up and running,
136 * the superblock could be released. And the module could
137 * have been unloaded. So sue me.
139 * Returns 1 if it slept, else zero.
142 struct super_block *sb = inode->i_sb;
143 DECLARE_WAITQUEUE(wait, current);
146 set_current_state(TASK_INTERRUPTIBLE);
147 add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
148 if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
152 remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
156 case EXT3_IOC_GETRSVSZ:
157 if (test_opt(inode->i_sb, RESERVATION) && S_ISREG(inode->i_mode)) {
158 rsv_window_size = atomic_read(&ei->i_rsv_window.rsv_goal_size);
159 return put_user(rsv_window_size, (int *)arg);
162 case EXT3_IOC_SETRSVSZ:
163 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
166 if (IS_RDONLY(inode))
169 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
172 if (get_user(rsv_window_size, (int *)arg))
175 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
176 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
177 atomic_set(&ei->i_rsv_window.rsv_goal_size, rsv_window_size);
179 case EXT3_IOC_GROUP_EXTEND: {
180 unsigned long n_blocks_count;
181 struct super_block *sb = inode->i_sb;
184 if (!capable(CAP_SYS_RESOURCE))
187 if (sb->s_flags & MS_RDONLY)
190 if (get_user(n_blocks_count, (__u32 *)arg))
193 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
194 journal_lock_updates(EXT3_SB(sb)->s_journal);
195 journal_flush(EXT3_SB(sb)->s_journal);
196 journal_unlock_updates(EXT3_SB(sb)->s_journal);
200 case EXT3_IOC_GROUP_ADD: {
201 struct ext3_new_group_data input;
202 struct super_block *sb = inode->i_sb;
205 if (!capable(CAP_SYS_RESOURCE))
208 if (inode->i_sb->s_flags & MS_RDONLY)
211 if (copy_from_user(&input, (struct ext3_new_group_input *)arg,
215 err = ext3_group_add(sb, &input);
216 journal_lock_updates(EXT3_SB(sb)->s_journal);
217 journal_flush(EXT3_SB(sb)->s_journal);
218 journal_unlock_updates(EXT3_SB(sb)->s_journal);
224 #if defined(CONFIG_VSERVER_LEGACY) && !defined(CONFIG_INOXID_NONE)
225 case EXT3_IOC_SETXID: {
227 struct ext3_iloc iloc;
231 /* fixme: if stealth, return -ENOTTY */
232 if (!capable(CAP_CONTEXT))
234 if (IS_RDONLY(inode))
236 if (!(inode->i_sb->s_flags & MS_TAGXID))
238 if (get_user(xid, (int *) arg))
241 handle = ext3_journal_start(inode, 1);
243 return PTR_ERR(handle);
244 err = ext3_reserve_inode_write(handle, inode, &iloc);
248 inode->i_xid = (xid & 0xFFFF);
249 inode->i_ctime = CURRENT_TIME;
251 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
252 ext3_journal_stop(handle);