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![Miklos Szeredi](/assets/img/avatar_default.png)
Use the fileattr API to let the VFS handle locking, permission checking and conversion. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: Jan Kara <jack@suse.cz>
159 lines
3.8 KiB
C
159 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext2/ioctl.c
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*
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* Copyright (C) 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*/
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#include "ext2.h"
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#include <linux/capability.h>
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#include <linux/time.h>
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#include <linux/sched.h>
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#include <linux/compat.h>
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#include <linux/mount.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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int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
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{
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struct ext2_inode_info *ei = EXT2_I(d_inode(dentry));
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fileattr_fill_flags(fa, ei->i_flags & EXT2_FL_USER_VISIBLE);
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return 0;
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}
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int ext2_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 ext2_inode_info *ei = EXT2_I(inode);
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if (fileattr_has_fsx(fa))
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return -EOPNOTSUPP;
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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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ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) |
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(fa->flags & EXT2_FL_USER_MODIFIABLE);
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ext2_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 ext2_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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struct ext2_inode_info *ei = EXT2_I(inode);
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unsigned short rsv_window_size;
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int ret;
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ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
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switch (cmd) {
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case EXT2_IOC_GETVERSION:
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return put_user(inode->i_generation, (int __user *) arg);
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case EXT2_IOC_SETVERSION: {
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__u32 generation;
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if (!inode_owner_or_capable(&init_user_ns, inode))
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return -EPERM;
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ret = mnt_want_write_file(filp);
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if (ret)
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return ret;
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if (get_user(generation, (int __user *) arg)) {
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ret = -EFAULT;
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goto setversion_out;
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}
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inode_lock(inode);
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inode->i_ctime = current_time(inode);
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inode->i_generation = generation;
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inode_unlock(inode);
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mark_inode_dirty(inode);
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setversion_out:
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mnt_drop_write_file(filp);
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return ret;
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}
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case EXT2_IOC_GETRSVSZ:
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if (test_opt(inode->i_sb, RESERVATION)
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&& S_ISREG(inode->i_mode)
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&& ei->i_block_alloc_info) {
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rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
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return put_user(rsv_window_size, (int __user *)arg);
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}
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return -ENOTTY;
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case EXT2_IOC_SETRSVSZ: {
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if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
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return -ENOTTY;
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if (!inode_owner_or_capable(&init_user_ns, inode))
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return -EACCES;
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if (get_user(rsv_window_size, (int __user *)arg))
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return -EFAULT;
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ret = mnt_want_write_file(filp);
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if (ret)
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return ret;
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if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
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rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
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/*
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* need to allocate reservation structure for this inode
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* before set the window size
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*/
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/*
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* XXX What lock should protect the rsv_goal_size?
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* Accessed in ext2_get_block only. ext3 uses i_truncate.
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*/
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mutex_lock(&ei->truncate_mutex);
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if (!ei->i_block_alloc_info)
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ext2_init_block_alloc_info(inode);
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if (ei->i_block_alloc_info){
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struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
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rsv->rsv_goal_size = rsv_window_size;
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} else {
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ret = -ENOMEM;
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}
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mutex_unlock(&ei->truncate_mutex);
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mnt_drop_write_file(filp);
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return ret;
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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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#ifdef CONFIG_COMPAT
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long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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/* These are just misnamed, they actually get/put from/to user an int */
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switch (cmd) {
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case EXT2_IOC32_GETVERSION:
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cmd = EXT2_IOC_GETVERSION;
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break;
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case EXT2_IOC32_SETVERSION:
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cmd = EXT2_IOC_SETVERSION;
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
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}
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#endif
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