mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
183 lines
4.2 KiB
183 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* linux/fs/ext2/ioctl.c |
|
* |
|
* Copyright (C) 1993, 1994, 1995 |
|
* Remy Card ([email protected]) |
|
* Laboratoire MASI - Institut Blaise Pascal |
|
* Universite Pierre et Marie Curie (Paris VI) |
|
*/ |
|
|
|
#include "ext2.h" |
|
#include <linux/capability.h> |
|
#include <linux/time.h> |
|
#include <linux/sched.h> |
|
#include <linux/compat.h> |
|
#include <linux/mount.h> |
|
#include <asm/current.h> |
|
#include <linux/uaccess.h> |
|
|
|
|
|
long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
|
{ |
|
struct inode *inode = file_inode(filp); |
|
struct ext2_inode_info *ei = EXT2_I(inode); |
|
unsigned int flags; |
|
unsigned short rsv_window_size; |
|
int ret; |
|
|
|
ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); |
|
|
|
switch (cmd) { |
|
case EXT2_IOC_GETFLAGS: |
|
flags = ei->i_flags & EXT2_FL_USER_VISIBLE; |
|
return put_user(flags, (int __user *) arg); |
|
case EXT2_IOC_SETFLAGS: { |
|
unsigned int oldflags; |
|
|
|
ret = mnt_want_write_file(filp); |
|
if (ret) |
|
return ret; |
|
|
|
if (!inode_owner_or_capable(&init_user_ns, inode)) { |
|
ret = -EACCES; |
|
goto setflags_out; |
|
} |
|
|
|
if (get_user(flags, (int __user *) arg)) { |
|
ret = -EFAULT; |
|
goto setflags_out; |
|
} |
|
|
|
flags = ext2_mask_flags(inode->i_mode, flags); |
|
|
|
inode_lock(inode); |
|
/* Is it quota file? Do not allow user to mess with it */ |
|
if (IS_NOQUOTA(inode)) { |
|
inode_unlock(inode); |
|
ret = -EPERM; |
|
goto setflags_out; |
|
} |
|
oldflags = ei->i_flags; |
|
|
|
ret = vfs_ioc_setflags_prepare(inode, oldflags, flags); |
|
if (ret) { |
|
inode_unlock(inode); |
|
goto setflags_out; |
|
} |
|
|
|
flags = flags & EXT2_FL_USER_MODIFIABLE; |
|
flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; |
|
ei->i_flags = flags; |
|
|
|
ext2_set_inode_flags(inode); |
|
inode->i_ctime = current_time(inode); |
|
inode_unlock(inode); |
|
|
|
mark_inode_dirty(inode); |
|
setflags_out: |
|
mnt_drop_write_file(filp); |
|
return ret; |
|
} |
|
case EXT2_IOC_GETVERSION: |
|
return put_user(inode->i_generation, (int __user *) arg); |
|
case EXT2_IOC_SETVERSION: { |
|
__u32 generation; |
|
|
|
if (!inode_owner_or_capable(&init_user_ns, inode)) |
|
return -EPERM; |
|
ret = mnt_want_write_file(filp); |
|
if (ret) |
|
return ret; |
|
if (get_user(generation, (int __user *) arg)) { |
|
ret = -EFAULT; |
|
goto setversion_out; |
|
} |
|
|
|
inode_lock(inode); |
|
inode->i_ctime = current_time(inode); |
|
inode->i_generation = generation; |
|
inode_unlock(inode); |
|
|
|
mark_inode_dirty(inode); |
|
setversion_out: |
|
mnt_drop_write_file(filp); |
|
return ret; |
|
} |
|
case EXT2_IOC_GETRSVSZ: |
|
if (test_opt(inode->i_sb, RESERVATION) |
|
&& S_ISREG(inode->i_mode) |
|
&& ei->i_block_alloc_info) { |
|
rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; |
|
return put_user(rsv_window_size, (int __user *)arg); |
|
} |
|
return -ENOTTY; |
|
case EXT2_IOC_SETRSVSZ: { |
|
|
|
if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) |
|
return -ENOTTY; |
|
|
|
if (!inode_owner_or_capable(&init_user_ns, inode)) |
|
return -EACCES; |
|
|
|
if (get_user(rsv_window_size, (int __user *)arg)) |
|
return -EFAULT; |
|
|
|
ret = mnt_want_write_file(filp); |
|
if (ret) |
|
return ret; |
|
|
|
if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS) |
|
rsv_window_size = EXT2_MAX_RESERVE_BLOCKS; |
|
|
|
/* |
|
* need to allocate reservation structure for this inode |
|
* before set the window size |
|
*/ |
|
/* |
|
* XXX What lock should protect the rsv_goal_size? |
|
* Accessed in ext2_get_block only. ext3 uses i_truncate. |
|
*/ |
|
mutex_lock(&ei->truncate_mutex); |
|
if (!ei->i_block_alloc_info) |
|
ext2_init_block_alloc_info(inode); |
|
|
|
if (ei->i_block_alloc_info){ |
|
struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; |
|
rsv->rsv_goal_size = rsv_window_size; |
|
} else { |
|
ret = -ENOMEM; |
|
} |
|
|
|
mutex_unlock(&ei->truncate_mutex); |
|
mnt_drop_write_file(filp); |
|
return ret; |
|
} |
|
default: |
|
return -ENOTTY; |
|
} |
|
} |
|
|
|
#ifdef CONFIG_COMPAT |
|
long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
|
{ |
|
/* These are just misnamed, they actually get/put from/to user an int */ |
|
switch (cmd) { |
|
case EXT2_IOC32_GETFLAGS: |
|
cmd = EXT2_IOC_GETFLAGS; |
|
break; |
|
case EXT2_IOC32_SETFLAGS: |
|
cmd = EXT2_IOC_SETFLAGS; |
|
break; |
|
case EXT2_IOC32_GETVERSION: |
|
cmd = EXT2_IOC_GETVERSION; |
|
break; |
|
case EXT2_IOC32_SETVERSION: |
|
cmd = EXT2_IOC_SETVERSION; |
|
break; |
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
|
} |
|
#endif
|
|
|