projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/fs/ext2/ioctl.c | |
| 3 | * | |
| 4 | * Copyright (C) 1993, 1994, 1995 | |
| 5 | * Remy Card ([email protected]) | |
| 6 | * Laboratoire MASI - Institut Blaise Pascal | |
| 7 | * Universite Pierre et Marie Curie (Paris VI) | |
| 8 | */ | |
| 9 | ||
| 10 | #include "ext2.h" | |
| 16f7e0fe | 11 | #include <linux/capability.h> |
| 1da177e4 LT |
12 | #include <linux/time.h> |
| 13 | #include <linux/sched.h> | |
| e322ff07 DH |
14 | #include <linux/compat.h> |
| 15 | #include <linux/smp_lock.h> | |
| 1da177e4 LT |
16 | #include <asm/current.h> |
| 17 | #include <asm/uaccess.h> | |
| 18 | ||
| 19 | ||
| 20 | int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, | |
| 21 | unsigned long arg) | |
| 22 | { | |
| 23 | struct ext2_inode_info *ei = EXT2_I(inode); | |
| 24 | unsigned int flags; | |
| 25 | ||
| 26 | ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); | |
| 27 | ||
| 28 | switch (cmd) { | |
| 29 | case EXT2_IOC_GETFLAGS: | |
| 30 | flags = ei->i_flags & EXT2_FL_USER_VISIBLE; | |
| 31 | return put_user(flags, (int __user *) arg); | |
| 32 | case EXT2_IOC_SETFLAGS: { | |
| 33 | unsigned int oldflags; | |
| 34 | ||
| 35 | if (IS_RDONLY(inode)) | |
| 36 | return -EROFS; | |
| 37 | ||
| 38 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | |
| 39 | return -EACCES; | |
| 40 | ||
| 41 | if (get_user(flags, (int __user *) arg)) | |
| 42 | return -EFAULT; | |
| 43 | ||
| 44 | if (!S_ISDIR(inode->i_mode)) | |
| 45 | flags &= ~EXT2_DIRSYNC_FL; | |
| 46 | ||
| 47 | oldflags = ei->i_flags; | |
| 48 | ||
| 49 | /* | |
| 50 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
| 51 | * the relevant capability. | |
| 52 | * | |
| 53 | * This test looks nicer. Thanks to Pauline Middelink | |
| 54 | */ | |
| 55 | if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { | |
| 56 | if (!capable(CAP_LINUX_IMMUTABLE)) | |
| 57 | return -EPERM; | |
| 58 | } | |
| 59 | ||
| 60 | flags = flags & EXT2_FL_USER_MODIFIABLE; | |
| 61 | flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; | |
| 62 | ei->i_flags = flags; | |
| 63 | ||
| 64 | ext2_set_inode_flags(inode); | |
| 65 | inode->i_ctime = CURRENT_TIME_SEC; | |
| 66 | mark_inode_dirty(inode); | |
| 67 | return 0; | |
| 68 | } | |
| 69 | case EXT2_IOC_GETVERSION: | |
| 70 | return put_user(inode->i_generation, (int __user *) arg); | |
| 71 | case EXT2_IOC_SETVERSION: | |
| 72 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | |
| 73 | return -EPERM; | |
| 74 | if (IS_RDONLY(inode)) | |
| 75 | return -EROFS; | |
| 76 | if (get_user(inode->i_generation, (int __user *) arg)) | |
| 77 | return -EFAULT; | |
| 78 | inode->i_ctime = CURRENT_TIME_SEC; | |
| 79 | mark_inode_dirty(inode); | |
| 80 | return 0; | |
| 81 | default: | |
| 82 | return -ENOTTY; | |
| 83 | } | |
| 84 | } | |
| e322ff07 DH |
85 | |
| 86 | #ifdef CONFIG_COMPAT | |
| 87 | long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
| 88 | { | |
| 89 | struct inode *inode = file->f_dentry->d_inode; | |
| 90 | int ret; | |
| 91 | ||
| 92 | /* These are just misnamed, they actually get/put from/to user an int */ | |
| 93 | switch (cmd) { | |
| 94 | case EXT2_IOC32_GETFLAGS: | |
| 95 | cmd = EXT2_IOC_GETFLAGS; | |
| 96 | break; | |
| 97 | case EXT2_IOC32_SETFLAGS: | |
| 98 | cmd = EXT2_IOC_SETFLAGS; | |
| 99 | break; | |
| 100 | case EXT2_IOC32_GETVERSION: | |
| 101 | cmd = EXT2_IOC_GETVERSION; | |
| 102 | break; | |
| 103 | case EXT2_IOC32_SETVERSION: | |
| 104 | cmd = EXT2_IOC_SETVERSION; | |
| 105 | break; | |
| 106 | default: | |
| 107 | return -ENOIOCTLCMD; | |
| 108 | } | |
| 109 | lock_kernel(); | |
| 110 | ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
| 111 | unlock_kernel(); | |
| 112 | return ret; | |
| 113 | } | |
| 114 | #endif |