fs/jfs/ioctl.c

   1 /*
   2  * linux/fs/jfs/ioctl.c
   3  *
   4  * Copyright (C) 2006 Herbert Poetzl
   5  * adapted from Remy Card's ext2/ioctl.c
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/ctype.h>
  10 #include <linux/capability.h>
  11 #include <linux/time.h>
  12 #include <asm/current.h>
  13 #include <asm/uaccess.h>
  14
  15 #include "jfs_incore.h"
  16 #include "jfs_dinode.h"
  17 #include "jfs_inode.h"
  18
  19
  20 static struct {
  21         long jfs_flag;
  22         long ext2_flag;
  23 } jfs_map[] = {
  24         {JFS_NOATIME_FL,        FS_NOATIME_FL},
  25         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
  26         {JFS_SYNC_FL,           FS_SYNC_FL},
  27         {JFS_SECRM_FL,          FS_SECRM_FL},
  28         {JFS_UNRM_FL,           FS_UNRM_FL},
  29         {JFS_APPEND_FL,         FS_APPEND_FL},
  30         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
  31         {0, 0},
  32 };
  33
  34 static long jfs_map_ext2(unsigned long flags, int from)
  35 {
  36         int index=0;
  37         long mapped=0;
  38
  39         while (jfs_map[index].jfs_flag) {
  40                 if (from) {
  41                         if (jfs_map[index].ext2_flag & flags)
  42                                 mapped |= jfs_map[index].jfs_flag;
  43                 } else {
  44                         if (jfs_map[index].jfs_flag & flags)
  45                                 mapped |= jfs_map[index].ext2_flag;
  46                 }
  47                 index++;
  48         }
  49         return mapped;
  50 }
  51
  52
  53 int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
  54                 unsigned long arg)
  55 {
  56         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
  57         unsigned int flags;
  58
  59         switch (cmd) {
  60         case JFS_IOC_GETFLAGS:
  61                 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
  62                 flags = jfs_map_ext2(flags, 0);
  63                 return put_user(flags, (int __user *) arg);
  64         case JFS_IOC_SETFLAGS: {
  65                 unsigned int oldflags;
  66
  67                 if (IS_RDONLY(inode))
  68                         return -EROFS;
  69
  70                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
  71                         return -EACCES;
  72
  73                 if (get_user(flags, (int __user *) arg))
  74                         return -EFAULT;
  75
  76                 flags = jfs_map_ext2(flags, 1);
  77                 if (!S_ISDIR(inode->i_mode))
  78                         flags &= ~JFS_DIRSYNC_FL;
  79
  80                 oldflags = jfs_inode->mode2;
  81
  82                 /*
  83                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
  84                  * the relevant capability.
  85                  */
  86                 if ((oldflags & JFS_IMMUTABLE_FL) ||
  87                         ((flags ^ oldflags) &
  88                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
  89                         if (!capable(CAP_LINUX_IMMUTABLE))
  90                                 return -EPERM;
  91                 }
  92
  93                 flags = flags & JFS_FL_USER_MODIFIABLE;
  94                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
  95                 jfs_inode->mode2 = flags;
  96
  97                 jfs_set_inode_flags(inode);
  98                 inode->i_ctime = CURRENT_TIME_SEC;
  99                 mark_inode_dirty(inode);
 100                 return 0;
 101         }
 102         default:
 103                 return -ENOTTY;
 104         }
 105 }
 106