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2ca58e30b1
Use the fileattr API to let the VFS handle locking, permission checking and conversion. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: Dave Kleikamp <shaggy@kernel.org>
147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/jfs/ioctl.c
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*
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* Copyright (C) 2006 Herbert Poetzl
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* adapted from Remy Card's ext2/ioctl.c
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*/
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#include <linux/fs.h>
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#include <linux/ctype.h>
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#include <linux/capability.h>
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#include <linux/mount.h>
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#include <linux/time.h>
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#include <linux/sched.h>
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#include <linux/blkdev.h>
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#include <asm/current.h>
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#include <linux/uaccess.h>
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#include <linux/fileattr.h>
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#include "jfs_filsys.h"
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#include "jfs_debug.h"
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#include "jfs_incore.h"
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#include "jfs_dinode.h"
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#include "jfs_inode.h"
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#include "jfs_dmap.h"
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#include "jfs_discard.h"
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static struct {
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long jfs_flag;
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long ext2_flag;
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} jfs_map[] = {
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{JFS_NOATIME_FL, FS_NOATIME_FL},
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{JFS_DIRSYNC_FL, FS_DIRSYNC_FL},
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{JFS_SYNC_FL, FS_SYNC_FL},
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{JFS_SECRM_FL, FS_SECRM_FL},
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{JFS_UNRM_FL, FS_UNRM_FL},
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{JFS_APPEND_FL, FS_APPEND_FL},
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{JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL},
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{0, 0},
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};
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static long jfs_map_ext2(unsigned long flags, int from)
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{
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int index=0;
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long mapped=0;
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while (jfs_map[index].jfs_flag) {
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if (from) {
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if (jfs_map[index].ext2_flag & flags)
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mapped |= jfs_map[index].jfs_flag;
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} else {
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if (jfs_map[index].jfs_flag & flags)
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mapped |= jfs_map[index].ext2_flag;
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}
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index++;
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}
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return mapped;
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}
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int jfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
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{
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struct jfs_inode_info *jfs_inode = JFS_IP(d_inode(dentry));
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unsigned int flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
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if (d_is_special(dentry))
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return -ENOTTY;
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fileattr_fill_flags(fa, jfs_map_ext2(flags, 0));
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return 0;
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}
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int jfs_fileattr_set(struct user_namespace *mnt_userns,
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struct dentry *dentry, struct fileattr *fa)
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{
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struct inode *inode = d_inode(dentry);
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struct jfs_inode_info *jfs_inode = JFS_IP(inode);
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unsigned int flags;
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if (d_is_special(dentry))
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return -ENOTTY;
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if (fileattr_has_fsx(fa))
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return -EOPNOTSUPP;
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flags = jfs_map_ext2(fa->flags, 1);
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if (!S_ISDIR(inode->i_mode))
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flags &= ~JFS_DIRSYNC_FL;
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/* Is it quota file? Do not allow user to mess with it */
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if (IS_NOQUOTA(inode))
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return -EPERM;
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flags = flags & JFS_FL_USER_MODIFIABLE;
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flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE;
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jfs_inode->mode2 = flags;
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jfs_set_inode_flags(inode);
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inode->i_ctime = current_time(inode);
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mark_inode_dirty(inode);
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return 0;
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}
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long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct inode *inode = file_inode(filp);
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switch (cmd) {
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case FITRIM:
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{
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struct super_block *sb = inode->i_sb;
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struct request_queue *q = bdev_get_queue(sb->s_bdev);
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struct fstrim_range range;
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s64 ret = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!blk_queue_discard(q)) {
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jfs_warn("FITRIM not supported on device");
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return -EOPNOTSUPP;
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}
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if (copy_from_user(&range, (struct fstrim_range __user *)arg,
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sizeof(range)))
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return -EFAULT;
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range.minlen = max_t(unsigned int, range.minlen,
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q->limits.discard_granularity);
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ret = jfs_ioc_trim(inode, &range);
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if (ret < 0)
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return ret;
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if (copy_to_user((struct fstrim_range __user *)arg, &range,
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sizeof(range)))
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return -EFAULT;
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return 0;
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}
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default:
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return -ENOTTY;
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}
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}
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