ia64/linux-2.6.18-xen.hg

view fs/jfs/ioctl.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
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1 /*
2 * linux/fs/jfs/ioctl.c
3 *
4 * Copyright (C) 2006 Herbert Poetzl
5 * adapted from Remy Card's ext2/ioctl.c
6 */
8 #include <linux/fs.h>
9 #include <linux/ext2_fs.h>
10 #include <linux/ctype.h>
11 #include <linux/capability.h>
12 #include <linux/time.h>
13 #include <asm/current.h>
14 #include <asm/uaccess.h>
16 #include "jfs_incore.h"
17 #include "jfs_dinode.h"
18 #include "jfs_inode.h"
21 static struct {
22 long jfs_flag;
23 long ext2_flag;
24 } jfs_map[] = {
25 {JFS_NOATIME_FL, EXT2_NOATIME_FL},
26 {JFS_DIRSYNC_FL, EXT2_DIRSYNC_FL},
27 {JFS_SYNC_FL, EXT2_SYNC_FL},
28 {JFS_SECRM_FL, EXT2_SECRM_FL},
29 {JFS_UNRM_FL, EXT2_UNRM_FL},
30 {JFS_APPEND_FL, EXT2_APPEND_FL},
31 {JFS_IMMUTABLE_FL, EXT2_IMMUTABLE_FL},
32 {0, 0},
33 };
35 static long jfs_map_ext2(unsigned long flags, int from)
36 {
37 int index=0;
38 long mapped=0;
40 while (jfs_map[index].jfs_flag) {
41 if (from) {
42 if (jfs_map[index].ext2_flag & flags)
43 mapped |= jfs_map[index].jfs_flag;
44 } else {
45 if (jfs_map[index].jfs_flag & flags)
46 mapped |= jfs_map[index].ext2_flag;
47 }
48 index++;
49 }
50 return mapped;
51 }
54 int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
55 unsigned long arg)
56 {
57 struct jfs_inode_info *jfs_inode = JFS_IP(inode);
58 unsigned int flags;
60 switch (cmd) {
61 case JFS_IOC_GETFLAGS:
62 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
63 flags = jfs_map_ext2(flags, 0);
64 return put_user(flags, (int __user *) arg);
65 case JFS_IOC_SETFLAGS: {
66 unsigned int oldflags;
68 if (IS_RDONLY(inode))
69 return -EROFS;
71 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
72 return -EACCES;
74 if (get_user(flags, (int __user *) arg))
75 return -EFAULT;
77 flags = jfs_map_ext2(flags, 1);
78 if (!S_ISDIR(inode->i_mode))
79 flags &= ~JFS_DIRSYNC_FL;
81 oldflags = jfs_inode->mode2;
83 /*
84 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
85 * the relevant capability.
86 */
87 if ((oldflags & JFS_IMMUTABLE_FL) ||
88 ((flags ^ oldflags) &
89 (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
90 if (!capable(CAP_LINUX_IMMUTABLE))
91 return -EPERM;
92 }
94 flags = flags & JFS_FL_USER_MODIFIABLE;
95 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
96 jfs_inode->mode2 = flags;
98 jfs_set_inode_flags(inode);
99 inode->i_ctime = CURRENT_TIME_SEC;
100 mark_inode_dirty(inode);
101 return 0;
102 }
103 default:
104 return -ENOTTY;
105 }
106 }