LXR linux/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
  27static 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
  41static 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
  60long 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_map_ext2(jfs_inode->mode2 & JFS_FL_USER_VISIBLE,
 102                                        0);
 103                err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
 104                if (err) {
 105                        inode_unlock(inode);
 106                        goto setflags_out;
 107                }
 108
 109                flags = flags & JFS_FL_USER_MODIFIABLE;
 110                flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE;
 111                jfs_inode->mode2 = flags;
 112
 113                jfs_set_inode_flags(inode);
 114                inode_unlock(inode);
 115                inode->i_ctime = current_time(inode);
 116                mark_inode_dirty(inode);
 117setflags_out:
 118                mnt_drop_write_file(filp);
 119                return err;
 120        }
 121
 122        case FITRIM:
 123        {
 124                struct super_block *sb = inode->i_sb;
 125                struct request_queue *q = bdev_get_queue(sb->s_bdev);
 126                struct fstrim_range range;
 127                s64 ret = 0;
 128
 129                if (!capable(CAP_SYS_ADMIN))
 130                        return -EPERM;
 131
 132                if (!blk_queue_discard(q)) {
 133                        jfs_warn("FITRIM not supported on device");
 134                        return -EOPNOTSUPP;
 135                }
 136
 137                if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 138                    sizeof(range)))
 139                        return -EFAULT;
 140
 141                range.minlen = max_t(unsigned int, range.minlen,
 142                        q->limits.discard_granularity);
 143
 144                ret = jfs_ioc_trim(inode, &range);
 145                if (ret < 0)
 146                        return ret;
 147
 148                if (copy_to_user((struct fstrim_range __user *)arg, &range,
 149                    sizeof(range)))
 150                        return -EFAULT;
 151
 152                return 0;
 153        }
 154
 155        default:
 156                return -ENOTTY;
 157        }
 158}
 159
 160#ifdef CONFIG_COMPAT
 161long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 162{
 163        /* While these ioctl numbers defined with 'long' and have different
 164         * numbers than the 64bit ABI,
 165         * the actual implementation only deals with ints and is compatible.
 166         */
 167        switch (cmd) {
 168        case JFS_IOC_GETFLAGS32:
 169                cmd = JFS_IOC_GETFLAGS;
 170                break;
 171        case JFS_IOC_SETFLAGS32:
 172                cmd = JFS_IOC_SETFLAGS;
 173                break;
 174        }
 175        return jfs_ioctl(filp, cmd, arg);
 176}
 177#endif
 178