fs/jfs/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/jfs/ioctl.c
   4  *
   5  * Copyright (C) 2006 Herbert Poetzl
   6  * adapted from Remy Card's ext2/ioctl.c
   7  */
   8
   9 #include <linux/fs.h>
  10 #include <linux/ctype.h>
  11 #include <linux/capability.h>
  12 #include <linux/mount.h>
  13 #include <linux/time.h>
  14 #include <linux/sched.h>
  15 #include <linux/blkdev.h>
  16 #include <asm/current.h>
  17 #include <linux/uaccess.h>
  18
  19 #include "jfs_filsys.h"
  20 #include "jfs_debug.h"
  21 #include "jfs_incore.h"
  22 #include "jfs_dinode.h"
  23 #include "jfs_inode.h"
  24 #include "jfs_dmap.h"
  25 #include "jfs_discard.h"
  26
  27 static struct {
  28         long jfs_flag;
  29         long ext2_flag;
  30 } jfs_map[] = {
  31         {JFS_NOATIME_FL,        FS_NOATIME_FL},
  32         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
  33         {JFS_SYNC_FL,           FS_SYNC_FL},
  34         {JFS_SECRM_FL,          FS_SECRM_FL},
  35         {JFS_UNRM_FL,           FS_UNRM_FL},
  36         {JFS_APPEND_FL,         FS_APPEND_FL},
  37         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
  38         {0, 0},
  39 };
  40
  41 static long jfs_map_ext2(unsigned long flags, int from)
  42 {
  43         int index=0;
  44         long mapped=0;
  45
  46         while (jfs_map[index].jfs_flag) {
  47                 if (from) {
  48                         if (jfs_map[index].ext2_flag & flags)
  49                                 mapped |= jfs_map[index].jfs_flag;
  50                 } else {
  51                         if (jfs_map[index].jfs_flag & flags)
  52                                 mapped |= jfs_map[index].ext2_flag;
  53                 }
  54                 index++;
  55         }
  56         return mapped;
  57 }
  58
  59
  60 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  61 {
  62         struct inode *inode = file_inode(filp);
  63         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
  64         unsigned int flags;
  65
  66         switch (cmd) {
  67         case JFS_IOC_GETFLAGS:
  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                 inode_lock(inode);
 100
 101                 oldflags = jfs_inode->mode2;
 102
 103                 /*
 104                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 105                  * the relevant capability.
 106                  */
 107                 if ((oldflags & JFS_IMMUTABLE_FL) ||
 108                         ((flags ^ oldflags) &
 109                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
 110                         if (!capable(CAP_LINUX_IMMUTABLE)) {
 111                                 inode_unlock(inode);
 112                                 err = -EPERM;
 113                                 goto setflags_out;
 114                         }
 115                 }
 116
 117                 flags = flags & JFS_FL_USER_MODIFIABLE;
 118                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
 119                 jfs_inode->mode2 = flags;
 120
 121                 jfs_set_inode_flags(inode);
 122                 inode_unlock(inode);
 123                 inode->i_ctime = current_time(inode);
 124                 mark_inode_dirty(inode);
 125 setflags_out:
 126                 mnt_drop_write_file(filp);
 127                 return err;
 128         }
 129
 130         case FITRIM:
 131         {
 132                 struct super_block *sb = inode->i_sb;
 133                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 134                 struct fstrim_range range;
 135                 s64 ret = 0;
 136
 137                 if (!capable(CAP_SYS_ADMIN))
 138                         return -EPERM;
 139
 140                 if (!blk_queue_discard(q)) {
 141                         jfs_warn("FITRIM not supported on device");
 142                         return -EOPNOTSUPP;
 143                 }
 144
 145                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 146                     sizeof(range)))
 147                         return -EFAULT;
 148
 149                 range.minlen = max_t(unsigned int, range.minlen,
 150                         q->limits.discard_granularity);
 151
 152                 ret = jfs_ioc_trim(inode, &range);
 153                 if (ret < 0)
 154                         return ret;
 155
 156                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 157                     sizeof(range)))
 158                         return -EFAULT;
 159
 160                 return 0;
 161         }
 162
 163         default:
 164                 return -ENOTTY;
 165         }
 166 }
 167
 168 #ifdef CONFIG_COMPAT
 169 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 170 {
 171         /* While these ioctl numbers defined with 'long' and have different
 172          * numbers than the 64bit ABI,
 173          * the actual implementation only deals with ints and is compatible.
 174          */
 175         switch (cmd) {
 176         case JFS_IOC_GETFLAGS32:
 177                 cmd = JFS_IOC_GETFLAGS;
 178                 break;
 179         case JFS_IOC_SETFLAGS32:
 180                 cmd = JFS_IOC_SETFLAGS;
 181                 break;
 182         }
 183         return jfs_ioctl(filp, cmd, arg);
 184 }
 185 #endif