1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * linux/fs/ext2/ioctl.c
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Copyright (C) 1993, 1994, 1995
61da177e4SLinus Torvalds * Remy Card (card@masi.ibp.fr)
71da177e4SLinus Torvalds * Laboratoire MASI - Institut Blaise Pascal
81da177e4SLinus Torvalds * Universite Pierre et Marie Curie (Paris VI)
91da177e4SLinus Torvalds */
101da177e4SLinus Torvalds
111da177e4SLinus Torvalds #include "ext2.h"
1216f7e0feSRandy Dunlap #include <linux/capability.h>
131da177e4SLinus Torvalds #include <linux/time.h>
141da177e4SLinus Torvalds #include <linux/sched.h>
15e322ff07SDavid Howells #include <linux/compat.h>
1642a74f20SDave Hansen #include <linux/mount.h>
171da177e4SLinus Torvalds #include <asm/current.h>
187c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
19aba405e3SMiklos Szeredi #include <linux/fileattr.h>
20aba405e3SMiklos Szeredi
ext2_fileattr_get(struct dentry * dentry,struct fileattr * fa)21aba405e3SMiklos Szeredi int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
22aba405e3SMiklos Szeredi {
23aba405e3SMiklos Szeredi struct ext2_inode_info *ei = EXT2_I(d_inode(dentry));
24aba405e3SMiklos Szeredi
25aba405e3SMiklos Szeredi fileattr_fill_flags(fa, ei->i_flags & EXT2_FL_USER_VISIBLE);
26aba405e3SMiklos Szeredi
27aba405e3SMiklos Szeredi return 0;
28aba405e3SMiklos Szeredi }
29aba405e3SMiklos Szeredi
ext2_fileattr_set(struct mnt_idmap * idmap,struct dentry * dentry,struct fileattr * fa)308782a9aeSChristian Brauner int ext2_fileattr_set(struct mnt_idmap *idmap,
31aba405e3SMiklos Szeredi struct dentry *dentry, struct fileattr *fa)
32aba405e3SMiklos Szeredi {
33aba405e3SMiklos Szeredi struct inode *inode = d_inode(dentry);
34aba405e3SMiklos Szeredi struct ext2_inode_info *ei = EXT2_I(inode);
35aba405e3SMiklos Szeredi
36aba405e3SMiklos Szeredi if (fileattr_has_fsx(fa))
37aba405e3SMiklos Szeredi return -EOPNOTSUPP;
38aba405e3SMiklos Szeredi
39aba405e3SMiklos Szeredi /* Is it quota file? Do not allow user to mess with it */
40aba405e3SMiklos Szeredi if (IS_NOQUOTA(inode))
41aba405e3SMiklos Szeredi return -EPERM;
42aba405e3SMiklos Szeredi
43aba405e3SMiklos Szeredi ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) |
44aba405e3SMiklos Szeredi (fa->flags & EXT2_FL_USER_MODIFIABLE);
45aba405e3SMiklos Szeredi
46aba405e3SMiklos Szeredi ext2_set_inode_flags(inode);
47*fc4eed64SJeff Layton inode_set_ctime_current(inode);
48aba405e3SMiklos Szeredi mark_inode_dirty(inode);
49aba405e3SMiklos Szeredi
50aba405e3SMiklos Szeredi return 0;
51aba405e3SMiklos Szeredi }
521da177e4SLinus Torvalds
531da177e4SLinus Torvalds
ext2_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)5414f9f7b2SAndi Kleen long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
551da177e4SLinus Torvalds {
56496ad9aaSAl Viro struct inode *inode = file_inode(filp);
571da177e4SLinus Torvalds struct ext2_inode_info *ei = EXT2_I(inode);
58a686cd89SMartin J. Bligh unsigned short rsv_window_size;
5942a74f20SDave Hansen int ret;
601da177e4SLinus Torvalds
611da177e4SLinus Torvalds ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
621da177e4SLinus Torvalds
631da177e4SLinus Torvalds switch (cmd) {
641da177e4SLinus Torvalds case EXT2_IOC_GETVERSION:
651da177e4SLinus Torvalds return put_user(inode->i_generation, (int __user *) arg);
6634b07840SDjalal Harouni case EXT2_IOC_SETVERSION: {
6734b07840SDjalal Harouni __u32 generation;
6834b07840SDjalal Harouni
6901beba79SChristian Brauner if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
701da177e4SLinus Torvalds return -EPERM;
71a561be71SAl Viro ret = mnt_want_write_file(filp);
7242a74f20SDave Hansen if (ret)
7342a74f20SDave Hansen return ret;
7434b07840SDjalal Harouni if (get_user(generation, (int __user *) arg)) {
7542a74f20SDave Hansen ret = -EFAULT;
7634b07840SDjalal Harouni goto setversion_out;
7742a74f20SDave Hansen }
7834b07840SDjalal Harouni
795955102cSAl Viro inode_lock(inode);
80*fc4eed64SJeff Layton inode_set_ctime_current(inode);
8134b07840SDjalal Harouni inode->i_generation = generation;
825955102cSAl Viro inode_unlock(inode);
8334b07840SDjalal Harouni
8434b07840SDjalal Harouni mark_inode_dirty(inode);
8534b07840SDjalal Harouni setversion_out:
862a79f17eSAl Viro mnt_drop_write_file(filp);
8742a74f20SDave Hansen return ret;
8834b07840SDjalal Harouni }
89a686cd89SMartin J. Bligh case EXT2_IOC_GETRSVSZ:
90a686cd89SMartin J. Bligh if (test_opt(inode->i_sb, RESERVATION)
91a686cd89SMartin J. Bligh && S_ISREG(inode->i_mode)
92a686cd89SMartin J. Bligh && ei->i_block_alloc_info) {
93a686cd89SMartin J. Bligh rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
94a686cd89SMartin J. Bligh return put_user(rsv_window_size, (int __user *)arg);
95a686cd89SMartin J. Bligh }
96a686cd89SMartin J. Bligh return -ENOTTY;
97a686cd89SMartin J. Bligh case EXT2_IOC_SETRSVSZ: {
98a686cd89SMartin J. Bligh
99a686cd89SMartin J. Bligh if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
100a686cd89SMartin J. Bligh return -ENOTTY;
101a686cd89SMartin J. Bligh
10201beba79SChristian Brauner if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
103a686cd89SMartin J. Bligh return -EACCES;
104a686cd89SMartin J. Bligh
105a686cd89SMartin J. Bligh if (get_user(rsv_window_size, (int __user *)arg))
106a686cd89SMartin J. Bligh return -EFAULT;
107a686cd89SMartin J. Bligh
108a561be71SAl Viro ret = mnt_want_write_file(filp);
10942a74f20SDave Hansen if (ret)
11042a74f20SDave Hansen return ret;
11142a74f20SDave Hansen
112a686cd89SMartin J. Bligh if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
113a686cd89SMartin J. Bligh rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
114a686cd89SMartin J. Bligh
115a686cd89SMartin J. Bligh /*
116a686cd89SMartin J. Bligh * need to allocate reservation structure for this inode
117a686cd89SMartin J. Bligh * before set the window size
118a686cd89SMartin J. Bligh */
119a686cd89SMartin J. Bligh /*
120a686cd89SMartin J. Bligh * XXX What lock should protect the rsv_goal_size?
121a686cd89SMartin J. Bligh * Accessed in ext2_get_block only. ext3 uses i_truncate.
122a686cd89SMartin J. Bligh */
123a686cd89SMartin J. Bligh mutex_lock(&ei->truncate_mutex);
124a686cd89SMartin J. Bligh if (!ei->i_block_alloc_info)
125a686cd89SMartin J. Bligh ext2_init_block_alloc_info(inode);
126a686cd89SMartin J. Bligh
127a686cd89SMartin J. Bligh if (ei->i_block_alloc_info){
128a686cd89SMartin J. Bligh struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
129a686cd89SMartin J. Bligh rsv->rsv_goal_size = rsv_window_size;
130acd1f046SChengguang Xu } else {
131acd1f046SChengguang Xu ret = -ENOMEM;
132a686cd89SMartin J. Bligh }
133acd1f046SChengguang Xu
134a686cd89SMartin J. Bligh mutex_unlock(&ei->truncate_mutex);
1352a79f17eSAl Viro mnt_drop_write_file(filp);
136acd1f046SChengguang Xu return ret;
137a686cd89SMartin J. Bligh }
1381da177e4SLinus Torvalds default:
1391da177e4SLinus Torvalds return -ENOTTY;
1401da177e4SLinus Torvalds }
1411da177e4SLinus Torvalds }
142e322ff07SDavid Howells
143e322ff07SDavid Howells #ifdef CONFIG_COMPAT
ext2_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)144e322ff07SDavid Howells long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
145e322ff07SDavid Howells {
146e322ff07SDavid Howells /* These are just misnamed, they actually get/put from/to user an int */
147e322ff07SDavid Howells switch (cmd) {
148e322ff07SDavid Howells case EXT2_IOC32_GETVERSION:
149e322ff07SDavid Howells cmd = EXT2_IOC_GETVERSION;
150e322ff07SDavid Howells break;
151e322ff07SDavid Howells case EXT2_IOC32_SETVERSION:
152e322ff07SDavid Howells cmd = EXT2_IOC_SETVERSION;
153e322ff07SDavid Howells break;
154e322ff07SDavid Howells default:
155e322ff07SDavid Howells return -ENOIOCTLCMD;
156e322ff07SDavid Howells }
15714f9f7b2SAndi Kleen return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
158e322ff07SDavid Howells }
159e322ff07SDavid Howells #endif
160