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 <linux/sched.h>
  13 #include <linux/mount.h>
  14 #include <asm/current.h>
  15 #include <asm/uaccess.h>
  16
  17 #include "jfs_incore.h"
  18 #include "jfs_dinode.h"
  19 #include "jfs_inode.h"
  20
  21
  22 static struct {
  23         long jfs_flag;
  24         long ext2_flag;
  25 } jfs_map[] = {
  26         {JFS_NOATIME_FL,        FS_NOATIME_FL},
  27         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
  28         {JFS_SYNC_FL,           FS_SYNC_FL},
  29         {JFS_SECRM_FL,          FS_SECRM_FL},
  30         {JFS_UNRM_FL,           FS_UNRM_FL},
  31         {JFS_APPEND_FL,         FS_APPEND_FL},
  32         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
  33         {0, 0},
  34 };
  35
  36 static long jfs_map_ext2(unsigned long flags, int from)
  37 {
  38         int index=0;
  39         long mapped=0;
  40
  41         while (jfs_map[index].jfs_flag) {
  42                 if (from) {
  43                         if (jfs_map[index].ext2_flag & flags)
  44                                 mapped |= jfs_map[index].jfs_flag;
  45                 } else {
  46                         if (jfs_map[index].jfs_flag & flags)
  47                                 mapped |= jfs_map[index].ext2_flag;
  48                 }
  49                 index++;
  50         }
  51         return mapped;
  52 }
  53
  54
  55 int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
  56                 unsigned long arg)
  57 {
  58         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
  59         unsigned int flags;
  60
  61         switch (cmd) {
  62         case JFS_IOC_GETFLAGS:
  63                 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
  64                 flags = jfs_map_ext2(flags, 0);
  65                 return put_user(flags, (int __user *) arg);
  66         case JFS_IOC_SETFLAGS: {
  67                 unsigned int oldflags;
  68
  69                 if (IS_RDONLY(inode) ||
  70                         (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
  71                         return -EROFS;
  72
  73                 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
  74                         return -EACCES;
  75
  76                 if (get_user(flags, (int __user *) arg))
  77                         return -EFAULT;
  78
  79                 flags = jfs_map_ext2(flags, 1);
  80                 if (!S_ISDIR(inode->i_mode))
  81                         flags &= ~JFS_DIRSYNC_FL;
  82
  83                 oldflags = jfs_inode->mode2;
  84
  85                 /*
  86                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
  87                  * the relevant capability.
  88                  */
  89                 if ((oldflags & JFS_IMMUTABLE_FL) ||
  90                         ((flags ^ oldflags) & (JFS_APPEND_FL |
  91                         JFS_IMMUTABLE_FL | JFS_IUNLINK_FL))) {
  92                         if (!capable(CAP_LINUX_IMMUTABLE))
  93                                 return -EPERM;
  94                 }
  95
  96                 flags = flags & JFS_FL_USER_MODIFIABLE;
  97                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
  98                 jfs_inode->mode2 = flags;
  99
 100                 jfs_set_inode_flags(inode);
 101                 inode->i_ctime = CURRENT_TIME_SEC;
 102                 mark_inode_dirty(inode);
 103                 return 0;
 104         }
 105         default:
 106                 return -ENOTTY;
 107         }
 108 }
 109