linux/fs/jfs/ioctl.c
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   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
  26static 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
  40static 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
  59long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  60{
  61        struct inode *inode = filp->f_dentry->d_inode;
  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);
 126setflags_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
 170long 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        case FITRIM:
 184                cmd = FITRIM;
 185                break;
 186        }
 187        return jfs_ioctl(filp, cmd, arg);
 188}
 189#endif
 190
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