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/mount.h>
  12 #include <linux/time.h>
  13 #include <linux/sched.h>
  14 #include <linux/blkdev.h>
  15 #include <asm/current.h>
  16 #include <asm/uaccess.h>
  17
  18 #include "jfs_filsys.h"
  19 #include "jfs_debug.h"
  20 #include "jfs_incore.h"
  21 #include "jfs_dinode.h"
  22 #include "jfs_inode.h"
  23 #include "jfs_dmap.h"
  24 #include "jfs_discard.h"
  25
  26 static struct {
  27         long jfs_flag;
  28         long ext2_flag;
  29 } jfs_map[] = {
  30         {JFS_NOATIME_FL,        FS_NOATIME_FL},
  31         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
  32         {JFS_SYNC_FL,           FS_SYNC_FL},
  33         {JFS_SECRM_FL,          FS_SECRM_FL},
  34         {JFS_UNRM_FL,           FS_UNRM_FL},
  35         {JFS_APPEND_FL,         FS_APPEND_FL},
  36         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
  37         {0, 0},
  38 };
  39
  40 static long jfs_map_ext2(unsigned long flags, int from)
  41 {
  42         int index=0;
  43         long mapped=0;
  44
  45         while (jfs_map[index].jfs_flag) {
  46                 if (from) {
  47                         if (jfs_map[index].ext2_flag & flags)
  48                                 mapped |= jfs_map[index].jfs_flag;
  49                 } else {
  50                         if (jfs_map[index].jfs_flag & flags)
  51                                 mapped |= jfs_map[index].ext2_flag;
  52                 }
  53                 index++;
  54         }
  55         return mapped;
  56 }
  57
  58
  59 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  60 {
  61         struct inode *inode = file_inode(filp);
  62         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
  63         unsigned int flags;
  64
  65         switch (cmd) {
  66         case JFS_IOC_GETFLAGS:
  67                 jfs_get_inode_flags(jfs_inode);
  68                 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
  69                 flags = jfs_map_ext2(flags, 0);
  70                 return put_user(flags, (int __user *) arg);
  71         case JFS_IOC_SETFLAGS: {
  72                 unsigned int oldflags;
  73                 int err;
  74
  75                 err = mnt_want_write_file(filp);
  76                 if (err)
  77                         return err;
  78
  79                 if (!inode_owner_or_capable(inode)) {
  80                         err = -EACCES;
  81                         goto setflags_out;
  82                 }
  83                 if (get_user(flags, (int __user *) arg)) {
  84                         err = -EFAULT;
  85                         goto setflags_out;
  86                 }
  87
  88                 flags = jfs_map_ext2(flags, 1);
  89                 if (!S_ISDIR(inode->i_mode))
  90                         flags &= ~JFS_DIRSYNC_FL;
  91
  92                 /* Is it quota file? Do not allow user to mess with it */
  93                 if (IS_NOQUOTA(inode)) {
  94                         err = -EPERM;
  95                         goto setflags_out;
  96                 }
  97
  98                 /* Lock against other parallel changes of flags */
  99                 mutex_lock(&inode->i_mutex);
 100
 101                 jfs_get_inode_flags(jfs_inode);
 102                 oldflags = jfs_inode->mode2;
 103
 104                 /*
 105                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 106                  * the relevant capability.
 107                  */
 108                 if ((oldflags & JFS_IMMUTABLE_FL) ||
 109                         ((flags ^ oldflags) &
 110                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
 111                         if (!capable(CAP_LINUX_IMMUTABLE)) {
 112                                 mutex_unlock(&inode->i_mutex);
 113                                 err = -EPERM;
 114                                 goto setflags_out;
 115                         }
 116                 }
 117
 118                 flags = flags & JFS_FL_USER_MODIFIABLE;
 119                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
 120                 jfs_inode->mode2 = flags;
 121
 122                 jfs_set_inode_flags(inode);
 123                 mutex_unlock(&inode->i_mutex);
 124                 inode->i_ctime = CURRENT_TIME_SEC;
 125                 mark_inode_dirty(inode);
 126 setflags_out:
 127                 mnt_drop_write_file(filp);
 128                 return err;
 129         }
 130
 131         case FITRIM:
 132         {
 133                 struct super_block *sb = inode->i_sb;
 134                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 135                 struct fstrim_range range;
 136                 s64 ret = 0;
 137
 138                 if (!capable(CAP_SYS_ADMIN))
 139                         return -EPERM;
 140
 141                 if (!blk_queue_discard(q)) {
 142                         jfs_warn("FITRIM not supported on device");
 143                         return -EOPNOTSUPP;
 144                 }
 145
 146                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 147                     sizeof(range)))
 148                         return -EFAULT;
 149
 150                 range.minlen = max_t(unsigned int, range.minlen,
 151                         q->limits.discard_granularity);
 152
 153                 ret = jfs_ioc_trim(inode, &range);
 154                 if (ret < 0)
 155                         return ret;
 156
 157                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 158                     sizeof(range)))
 159                         return -EFAULT;
 160
 161                 return 0;
 162         }
 163
 164         default:
 165                 return -ENOTTY;
 166         }
 167 }
 168
 169 #ifdef CONFIG_COMPAT
 170 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 171 {
 172         /* While these ioctl numbers defined with 'long' and have different
 173          * numbers than the 64bit ABI,
 174          * the actual implementation only deals with ints and is compatible.
 175          */
 176         switch (cmd) {
 177         case JFS_IOC_GETFLAGS32:
 178                 cmd = JFS_IOC_GETFLAGS;
 179                 break;
 180         case JFS_IOC_SETFLAGS32:
 181                 cmd = JFS_IOC_SETFLAGS;
 182                 break;
 183         }
 184         return jfs_ioctl(filp, cmd, arg);
 185 }
 186 #endif