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 #include <linux/fileattr.h>
  19
  20 #include "jfs_filsys.h"
  21 #include "jfs_debug.h"
  22 #include "jfs_incore.h"
  23 #include "jfs_dinode.h"
  24 #include "jfs_inode.h"
  25 #include "jfs_dmap.h"
  26 #include "jfs_discard.h"
  27
  28 static struct {
  29         long jfs_flag;
  30         long ext2_flag;
  31 } jfs_map[] = {
  32         {JFS_NOATIME_FL,        FS_NOATIME_FL},
  33         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
  34         {JFS_SYNC_FL,           FS_SYNC_FL},
  35         {JFS_SECRM_FL,          FS_SECRM_FL},
  36         {JFS_UNRM_FL,           FS_UNRM_FL},
  37         {JFS_APPEND_FL,         FS_APPEND_FL},
  38         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
  39         {0, 0},
  40 };
  41
  42 static long jfs_map_ext2(unsigned long flags, int from)
  43 {
  44         int index=0;
  45         long mapped=0;
  46
  47         while (jfs_map[index].jfs_flag) {
  48                 if (from) {
  49                         if (jfs_map[index].ext2_flag & flags)
  50                                 mapped |= jfs_map[index].jfs_flag;
  51                 } else {
  52                         if (jfs_map[index].jfs_flag & flags)
  53                                 mapped |= jfs_map[index].ext2_flag;
  54                 }
  55                 index++;
  56         }
  57         return mapped;
  58 }
  59
  60 int jfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
  61 {
  62         struct jfs_inode_info *jfs_inode = JFS_IP(d_inode(dentry));
  63         unsigned int flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
  64
  65         if (d_is_special(dentry))
  66                 return -ENOTTY;
  67
  68         fileattr_fill_flags(fa, jfs_map_ext2(flags, 0));
  69
  70         return 0;
  71 }
  72
  73 int jfs_fileattr_set(struct user_namespace *mnt_userns,
  74                      struct dentry *dentry, struct fileattr *fa)
  75 {
  76         struct inode *inode = d_inode(dentry);
  77         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
  78         unsigned int flags;
  79
  80         if (d_is_special(dentry))
  81                 return -ENOTTY;
  82
  83         if (fileattr_has_fsx(fa))
  84                 return -EOPNOTSUPP;
  85
  86         flags = jfs_map_ext2(fa->flags, 1);
  87         if (!S_ISDIR(inode->i_mode))
  88                 flags &= ~JFS_DIRSYNC_FL;
  89
  90         /* Is it quota file? Do not allow user to mess with it */
  91         if (IS_NOQUOTA(inode))
  92                 return -EPERM;
  93
  94         flags = flags & JFS_FL_USER_MODIFIABLE;
  95         flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE;
  96         jfs_inode->mode2 = flags;
  97
  98         jfs_set_inode_flags(inode);
  99         inode->i_ctime = current_time(inode);
 100         mark_inode_dirty(inode);
 101
 102         return 0;
 103 }
 104
 105 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 106 {
 107         struct inode *inode = file_inode(filp);
 108
 109         switch (cmd) {
 110         case FITRIM:
 111         {
 112                 struct super_block *sb = inode->i_sb;
 113                 struct fstrim_range range;
 114                 s64 ret = 0;
 115
 116                 if (!capable(CAP_SYS_ADMIN))
 117                         return -EPERM;
 118
 119                 if (!bdev_max_discard_sectors(sb->s_bdev)) {
 120                         jfs_warn("FITRIM not supported on device");
 121                         return -EOPNOTSUPP;
 122                 }
 123
 124                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 125                     sizeof(range)))
 126                         return -EFAULT;
 127
 128                 range.minlen = max_t(unsigned int, range.minlen,
 129                                      bdev_discard_granularity(sb->s_bdev));
 130
 131                 ret = jfs_ioc_trim(inode, &range);
 132                 if (ret < 0)
 133                         return ret;
 134
 135                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 136                     sizeof(range)))
 137                         return -EFAULT;
 138
 139                 return 0;
 140         }
 141
 142         default:
 143                 return -ENOTTY;
 144         }
 145 }