2 * linux/fs/ext2/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/capability.h>
12 #include <linux/time.h>
13 #include <linux/sched.h>
14 #include <linux/compat.h>
15 #include <linux/mount.h>
16 #include <linux/smp_lock.h>
17 #include <asm/current.h>
18 #include <asm/uaccess.h>
21 long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
23 struct inode *inode = filp->f_dentry->d_inode;
24 struct ext2_inode_info *ei = EXT2_I(inode);
26 unsigned short rsv_window_size;
29 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
32 case EXT2_IOC_GETFLAGS:
33 ext2_get_inode_flags(ei);
34 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
35 return put_user(flags, (int __user *) arg);
36 case EXT2_IOC_SETFLAGS: {
37 unsigned int oldflags;
39 ret = mnt_want_write(filp->f_path.mnt);
43 if (!is_owner_or_cap(inode)) {
48 if (get_user(flags, (int __user *) arg)) {
53 if (!S_ISDIR(inode->i_mode))
54 flags &= ~EXT2_DIRSYNC_FL;
56 mutex_lock(&inode->i_mutex);
57 /* Is it quota file? Do not allow user to mess with it */
58 if (IS_NOQUOTA(inode)) {
59 mutex_unlock(&inode->i_mutex);
63 oldflags = ei->i_flags;
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) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
72 if (!capable(CAP_LINUX_IMMUTABLE)) {
73 mutex_unlock(&inode->i_mutex);
79 flags = flags & EXT2_FL_USER_MODIFIABLE;
80 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
82 mutex_unlock(&inode->i_mutex);
84 ext2_set_inode_flags(inode);
85 inode->i_ctime = CURRENT_TIME_SEC;
86 mark_inode_dirty(inode);
88 mnt_drop_write(filp->f_path.mnt);
91 case EXT2_IOC_GETVERSION:
92 return put_user(inode->i_generation, (int __user *) arg);
93 case EXT2_IOC_SETVERSION:
94 if (!is_owner_or_cap(inode))
96 ret = mnt_want_write(filp->f_path.mnt);
99 if (get_user(inode->i_generation, (int __user *) arg)) {
102 inode->i_ctime = CURRENT_TIME_SEC;
103 mark_inode_dirty(inode);
105 mnt_drop_write(filp->f_path.mnt);
107 case EXT2_IOC_GETRSVSZ:
108 if (test_opt(inode->i_sb, RESERVATION)
109 && S_ISREG(inode->i_mode)
110 && ei->i_block_alloc_info) {
111 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
112 return put_user(rsv_window_size, (int __user *)arg);
115 case EXT2_IOC_SETRSVSZ: {
117 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
120 if (!is_owner_or_cap(inode))
123 if (get_user(rsv_window_size, (int __user *)arg))
126 ret = mnt_want_write(filp->f_path.mnt);
130 if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
131 rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
134 * need to allocate reservation structure for this inode
135 * before set the window size
138 * XXX What lock should protect the rsv_goal_size?
139 * Accessed in ext2_get_block only. ext3 uses i_truncate.
141 mutex_lock(&ei->truncate_mutex);
142 if (!ei->i_block_alloc_info)
143 ext2_init_block_alloc_info(inode);
145 if (ei->i_block_alloc_info){
146 struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
147 rsv->rsv_goal_size = rsv_window_size;
149 mutex_unlock(&ei->truncate_mutex);
150 mnt_drop_write(filp->f_path.mnt);
159 long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
161 /* These are just misnamed, they actually get/put from/to user an int */
163 case EXT2_IOC32_GETFLAGS:
164 cmd = EXT2_IOC_GETFLAGS;
166 case EXT2_IOC32_SETFLAGS:
167 cmd = EXT2_IOC_SETFLAGS;
169 case EXT2_IOC32_GETVERSION:
170 cmd = EXT2_IOC_GETVERSION;
172 case EXT2_IOC32_SETVERSION:
173 cmd = EXT2_IOC_SETVERSION;
178 return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));