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Linux Cross Reference
Linux-2.6.17/fs/ext2/ioctl.c

Version: ~ [ 2.6.16 ] ~ [ 2.6.17 ] ~
Architecture: ~ [ ia64 ] ~ [ i386 ] ~ [ arm ] ~ [ ppc ] ~ [ sparc64 ] ~ 
  1 /*
  2  * linux/fs/ext2/ioctl.c
  3  *
  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)
  8  */
  9 
 10 #include "ext2.h"
 11 #include <linux/capability.h>
 12 #include <linux/time.h>
 13 #include <linux/sched.h>
 14 #include <asm/current.h>
 15 #include <asm/uaccess.h>
 16 
 17 
 18 int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 19                 unsigned long arg)
 20 {
 21         struct ext2_inode_info *ei = EXT2_I(inode);
 22         unsigned int flags;
 23 
 24         ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
 25 
 26         switch (cmd) {
 27         case EXT2_IOC_GETFLAGS:
 28                 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
 29                 return put_user(flags, (int __user *) arg);
 30         case EXT2_IOC_SETFLAGS: {
 31                 unsigned int oldflags;
 32 
 33                 if (IS_RDONLY(inode))
 34                         return -EROFS;
 35 
 36                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
 37                         return -EACCES;
 38 
 39                 if (get_user(flags, (int __user *) arg))
 40                         return -EFAULT;
 41 
 42                 if (!S_ISDIR(inode->i_mode))
 43                         flags &= ~EXT2_DIRSYNC_FL;
 44 
 45                 oldflags = ei->i_flags;
 46 
 47                 /*
 48                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 49                  * the relevant capability.
 50                  *
 51                  * This test looks nicer. Thanks to Pauline Middelink
 52                  */
 53                 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
 54                         if (!capable(CAP_LINUX_IMMUTABLE))
 55                                 return -EPERM;
 56                 }
 57 
 58                 flags = flags & EXT2_FL_USER_MODIFIABLE;
 59                 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
 60                 ei->i_flags = flags;
 61 
 62                 ext2_set_inode_flags(inode);
 63                 inode->i_ctime = CURRENT_TIME_SEC;
 64                 mark_inode_dirty(inode);
 65                 return 0;
 66         }
 67         case EXT2_IOC_GETVERSION:
 68                 return put_user(inode->i_generation, (int __user *) arg);
 69         case EXT2_IOC_SETVERSION:
 70                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
 71                         return -EPERM;
 72                 if (IS_RDONLY(inode))
 73                         return -EROFS;
 74                 if (get_user(inode->i_generation, (int __user *) arg))
 75                         return -EFAULT; 
 76                 inode->i_ctime = CURRENT_TIME_SEC;
 77                 mark_inode_dirty(inode);
 78                 return 0;
 79         default:
 80                 return -ENOTTY;
 81         }
 82 }
 83
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