linux/fs/jfs/ioctl.c
<<
>>
Prefs
   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
  28static 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
  42static 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
  60int 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
  73int 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
 105long 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 request_queue *q = bdev_get_queue(sb->s_bdev);
 114                struct fstrim_range range;
 115                s64 ret = 0;
 116
 117                if (!capable(CAP_SYS_ADMIN))
 118                        return -EPERM;
 119
 120                if (!blk_queue_discard(q)) {
 121                        jfs_warn("FITRIM not supported on device");
 122                        return -EOPNOTSUPP;
 123                }
 124
 125                if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 126                    sizeof(range)))
 127                        return -EFAULT;
 128
 129                range.minlen = max_t(unsigned int, range.minlen,
 130                        q->limits.discard_granularity);
 131
 132                ret = jfs_ioc_trim(inode, &range);
 133                if (ret < 0)
 134                        return ret;
 135
 136                if (copy_to_user((struct fstrim_range __user *)arg, &range,
 137                    sizeof(range)))
 138                        return -EFAULT;
 139
 140                return 0;
 141        }
 142
 143        default:
 144                return -ENOTTY;
 145        }
 146}
 147