// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/jfs/ioctl.c
 *
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c
 */

#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/capability.h>
#include <linux/mount.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/blkdev.h>
#include <asm/current.h>
#include <linux/uaccess.h>
#include <linux/fileattr.h>

#include "jfs_filsys.h"
#include "jfs_debug.h"
#include "jfs_incore.h"
#include "jfs_dinode.h"
#include "jfs_inode.h"
#include "jfs_dmap.h"
#include "jfs_discard.h"

static struct {
        long jfs_flag;
        long ext2_flag;
} jfs_map[] = {
        {JFS_NOATIME_FL,        FS_NOATIME_FL},
        {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
        {JFS_SYNC_FL,           FS_SYNC_FL},
        {JFS_SECRM_FL,          FS_SECRM_FL},
        {JFS_UNRM_FL,           FS_UNRM_FL},
        {JFS_APPEND_FL,         FS_APPEND_FL},
        {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
        {0, 0},
};

static long jfs_map_ext2(unsigned long flags, int from)
{
        int index=0;
        long mapped=0;

        while (jfs_map[index].jfs_flag) {
                if (from) {
                        if (jfs_map[index].ext2_flag & flags)
                                mapped |= jfs_map[index].jfs_flag;
                } else {
                        if (jfs_map[index].jfs_flag & flags)
                                mapped |= jfs_map[index].ext2_flag;
                }
                index++;
        }
        return mapped;
}

int jfs_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
{
        struct jfs_inode_info *jfs_inode = JFS_IP(d_inode(dentry));
        unsigned int flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;

        if (d_is_special(dentry))
                return -ENOTTY;

        fileattr_fill_flags(fa, jfs_map_ext2(flags, 0));

        return 0;
}

int jfs_fileattr_set(struct mnt_idmap *idmap,
                     struct dentry *dentry, struct file_kattr *fa)
{
        struct inode *inode = d_inode(dentry);
        struct jfs_inode_info *jfs_inode = JFS_IP(inode);
        unsigned int flags;

        if (d_is_special(dentry))
                return -ENOTTY;

        if (fileattr_has_fsx(fa))
                return -EOPNOTSUPP;

        flags = jfs_map_ext2(fa->flags, 1);
        if (!S_ISDIR(inode->i_mode))
                flags &= ~JFS_DIRSYNC_FL;

        /* Is it quota file? Do not allow user to mess with it */
        if (IS_NOQUOTA(inode))
                return -EPERM;

        flags = flags & JFS_FL_USER_MODIFIABLE;
        flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE;
        jfs_inode->mode2 = flags;

        jfs_set_inode_flags(inode);
        inode_set_ctime_current(inode);
        mark_inode_dirty(inode);

        return 0;
}

long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        struct inode *inode = file_inode(filp);

        switch (cmd) {
        case FITRIM:
        {
                struct super_block *sb = inode->i_sb;
                struct fstrim_range range;
                s64 ret = 0;

                if (!capable(CAP_SYS_ADMIN))
                        return -EPERM;

                if (!bdev_max_discard_sectors(sb->s_bdev)) {
                        jfs_warn("FITRIM not supported on device");
                        return -EOPNOTSUPP;
                }

                if (copy_from_user(&range, (struct fstrim_range __user *)arg,
                    sizeof(range)))
                        return -EFAULT;

                range.minlen = max_t(unsigned int, range.minlen,
                                     bdev_discard_granularity(sb->s_bdev));

                ret = jfs_ioc_trim(inode, &range);
                if (ret < 0)
                        return ret;

                if (copy_to_user((struct fstrim_range __user *)arg, &range,
                    sizeof(range)))
                        return -EFAULT;

                return 0;
        }

        default:
                return -ENOTTY;
        }
}