1/*
2 * linux/fs/ocfs2/ioctl.c
3 *
4 * Copyright (C) 2006 Herbert Poetzl
5 * adapted from Remy Card's ext2/ioctl.c
6 */
7
8#include <linux/fs.h>
9#include <linux/mount.h>
10#include <linux/compat.h>
11
12#define MLOG_MASK_PREFIX ML_INODE
13#include <cluster/masklog.h>
14
15#include "ocfs2.h"
16#include "alloc.h"
17#include "dlmglue.h"
18#include "file.h"
19#include "inode.h"
20#include "journal.h"
21
22#include "ocfs2_fs.h"
23#include "ioctl.h"
24#include "resize.h"
25#include "refcounttree.h"
26
27#include <linux/ext2_fs.h>
28
29static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
30{
31	int status;
32
33	status = ocfs2_inode_lock(inode, NULL, 0);
34	if (status < 0) {
35		mlog_errno(status);
36		return status;
37	}
38	ocfs2_get_inode_flags(OCFS2_I(inode));
39	*flags = OCFS2_I(inode)->ip_attr;
40	ocfs2_inode_unlock(inode, 0);
41
42	mlog_exit(status);
43	return status;
44}
45
46static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
47				unsigned mask)
48{
49	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
50	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
51	handle_t *handle = NULL;
52	struct buffer_head *bh = NULL;
53	unsigned oldflags;
54	int status;
55
56	mutex_lock(&inode->i_mutex);
57
58	status = ocfs2_inode_lock(inode, &bh, 1);
59	if (status < 0) {
60		mlog_errno(status);
61		goto bail;
62	}
63
64	status = -EACCES;
65	if (!is_owner_or_cap(inode))
66		goto bail_unlock;
67
68	if (!S_ISDIR(inode->i_mode))
69		flags &= ~OCFS2_DIRSYNC_FL;
70
71	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
72	if (IS_ERR(handle)) {
73		status = PTR_ERR(handle);
74		mlog_errno(status);
75		goto bail_unlock;
76	}
77
78	oldflags = ocfs2_inode->ip_attr;
79	flags = flags & mask;
80	flags |= oldflags & ~mask;
81
82	/*
83	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
84	 * the relevant capability.
85	 */
86	status = -EPERM;
87	if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
88		(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
89		if (!capable(CAP_LINUX_IMMUTABLE))
90			goto bail_unlock;
91	}
92
93	ocfs2_inode->ip_attr = flags;
94	ocfs2_set_inode_flags(inode);
95
96	status = ocfs2_mark_inode_dirty(handle, inode, bh);
97	if (status < 0)
98		mlog_errno(status);
99
100	ocfs2_commit_trans(osb, handle);
101bail_unlock:
102	ocfs2_inode_unlock(inode, 1);
103bail:
104	mutex_unlock(&inode->i_mutex);
105
106	brelse(bh);
107
108	mlog_exit(status);
109	return status;
110}
111
112long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
113{
114	struct inode *inode = filp->f_path.dentry->d_inode;
115	unsigned int flags;
116	int new_clusters;
117	int status;
118	struct ocfs2_space_resv sr;
119	struct ocfs2_new_group_input input;
120	struct reflink_arguments args;
121	const char *old_path, *new_path;
122	bool preserve;
123
124	switch (cmd) {
125	case OCFS2_IOC_GETFLAGS:
126		status = ocfs2_get_inode_attr(inode, &flags);
127		if (status < 0)
128			return status;
129
130		flags &= OCFS2_FL_VISIBLE;
131		return put_user(flags, (int __user *) arg);
132	case OCFS2_IOC_SETFLAGS:
133		if (get_user(flags, (int __user *) arg))
134			return -EFAULT;
135
136		status = mnt_want_write(filp->f_path.mnt);
137		if (status)
138			return status;
139		status = ocfs2_set_inode_attr(inode, flags,
140			OCFS2_FL_MODIFIABLE);
141		mnt_drop_write(filp->f_path.mnt);
142		return status;
143	case OCFS2_IOC_RESVSP:
144	case OCFS2_IOC_RESVSP64:
145	case OCFS2_IOC_UNRESVSP:
146	case OCFS2_IOC_UNRESVSP64:
147		if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
148			return -EFAULT;
149
150		return ocfs2_change_file_space(filp, cmd, &sr);
151	case OCFS2_IOC_GROUP_EXTEND:
152		if (!capable(CAP_SYS_RESOURCE))
153			return -EPERM;
154
155		if (get_user(new_clusters, (int __user *)arg))
156			return -EFAULT;
157
158		return ocfs2_group_extend(inode, new_clusters);
159	case OCFS2_IOC_GROUP_ADD:
160	case OCFS2_IOC_GROUP_ADD64:
161		if (!capable(CAP_SYS_RESOURCE))
162			return -EPERM;
163
164		if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
165			return -EFAULT;
166
167		return ocfs2_group_add(inode, &input);
168	case OCFS2_IOC_REFLINK:
169		if (copy_from_user(&args, (struct reflink_arguments *)arg,
170				   sizeof(args)))
171			return -EFAULT;
172		old_path = (const char *)(unsigned long)args.old_path;
173		new_path = (const char *)(unsigned long)args.new_path;
174		preserve = (args.preserve != 0);
175
176		return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
177	default:
178		return -ENOTTY;
179	}
180}
181
182#ifdef CONFIG_COMPAT
183long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
184{
185	bool preserve;
186	struct reflink_arguments args;
187	struct inode *inode = file->f_path.dentry->d_inode;
188
189	switch (cmd) {
190	case OCFS2_IOC32_GETFLAGS:
191		cmd = OCFS2_IOC_GETFLAGS;
192		break;
193	case OCFS2_IOC32_SETFLAGS:
194		cmd = OCFS2_IOC_SETFLAGS;
195		break;
196	case OCFS2_IOC_RESVSP:
197	case OCFS2_IOC_RESVSP64:
198	case OCFS2_IOC_UNRESVSP:
199	case OCFS2_IOC_UNRESVSP64:
200	case OCFS2_IOC_GROUP_EXTEND:
201	case OCFS2_IOC_GROUP_ADD:
202	case OCFS2_IOC_GROUP_ADD64:
203		break;
204	case OCFS2_IOC_REFLINK:
205		if (copy_from_user(&args, (struct reflink_arguments *)arg,
206				   sizeof(args)))
207			return -EFAULT;
208		preserve = (args.preserve != 0);
209
210		return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
211					   compat_ptr(args.new_path), preserve);
212	default:
213		return -ENOIOCTLCMD;
214	}
215
216	return ocfs2_ioctl(file, cmd, arg);
217}
218#endif
219