[linux-2.6-block.git] / fs / ocfs2 / ioctl.c

/*
 * linux/fs/ocfs2/ioctl.c
 *
 * Copyright (C) 2006 Herbert Poetzl
 * adapted from Remy Card's ext2/ioctl.c
 */

#include <linux/fs.h>
#include <linux/mount.h>

#define MLOG_MASK_PREFIX ML_INODE
#include <cluster/masklog.h>

#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "journal.h"

#include "ocfs2_fs.h"
#include "ioctl.h"
#include "resize.h"
#include "refcounttree.h"

#include <linux/ext2_fs.h>

static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
{
	int status;

	status = ocfs2_inode_lock(inode, NULL, 0);
	if (status < 0) {
		mlog_errno(status);
		return status;
	}
	ocfs2_get_inode_flags(OCFS2_I(inode));
	*flags = OCFS2_I(inode)->ip_attr;
	ocfs2_inode_unlock(inode, 0);

	mlog_exit(status);
	return status;
}

static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
				unsigned mask)
{
	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	handle_t *handle = NULL;
	struct buffer_head *bh = NULL;
	unsigned oldflags;
	int status;

	mutex_lock(&inode->i_mutex);

	status = ocfs2_inode_lock(inode, &bh, 1);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	status = -EACCES;
	if (!is_owner_or_cap(inode))
		goto bail_unlock;

	if (!S_ISDIR(inode->i_mode))
		flags &= ~OCFS2_DIRSYNC_FL;

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		goto bail_unlock;
	}

	oldflags = ocfs2_inode->ip_attr;
	flags = flags & mask;
	flags |= oldflags & ~mask;

	/*
	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
	 * the relevant capability.
	 */
	status = -EPERM;
	if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
		(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
		if (!capable(CAP_LINUX_IMMUTABLE))
			goto bail_unlock;
	}

	ocfs2_inode->ip_attr = flags;
	ocfs2_set_inode_flags(inode);

	status = ocfs2_mark_inode_dirty(handle, inode, bh);
	if (status < 0)
		mlog_errno(status);

	ocfs2_commit_trans(osb, handle);
bail_unlock:
	ocfs2_inode_unlock(inode, 1);
bail:
	mutex_unlock(&inode->i_mutex);

	brelse(bh);

	mlog_exit(status);
	return status;
}

long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = filp->f_path.dentry->d_inode;
	unsigned int flags;
	int new_clusters;
	int status;
	struct ocfs2_space_resv sr;
	struct ocfs2_new_group_input input;
	struct reflink_arguments args;
	const char *old_path, *new_path;
	bool preserve;

	switch (cmd) {
	case OCFS2_IOC_GETFLAGS:
		status = ocfs2_get_inode_attr(inode, &flags);
		if (status < 0)
			return status;

		flags &= OCFS2_FL_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case OCFS2_IOC_SETFLAGS:
		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		status = mnt_want_write(filp->f_path.mnt);
		if (status)
			return status;
		status = ocfs2_set_inode_attr(inode, flags,
			OCFS2_FL_MODIFIABLE);
		mnt_drop_write(filp->f_path.mnt);
		return status;
	case OCFS2_IOC_RESVSP:
	case OCFS2_IOC_RESVSP64:
	case OCFS2_IOC_UNRESVSP:
	case OCFS2_IOC_UNRESVSP64:
		if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
			return -EFAULT;

		return ocfs2_change_file_space(filp, cmd, &sr);
	case OCFS2_IOC_GROUP_EXTEND:
		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (get_user(new_clusters, (int __user *)arg))
			return -EFAULT;

		return ocfs2_group_extend(inode, new_clusters);
	case OCFS2_IOC_GROUP_ADD:
	case OCFS2_IOC_GROUP_ADD64:
		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
			return -EFAULT;

		return ocfs2_group_add(inode, &input);
	case OCFS2_IOC_REFLINK:
		if (copy_from_user(&args, (struct reflink_arguments *)arg,
				   sizeof(args)))
			return -EFAULT;
		old_path = (const char *)(unsigned long)args.old_path;
		new_path = (const char *)(unsigned long)args.new_path;
		preserve = (args.preserve != 0);

		return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
	switch (cmd) {
	case OCFS2_IOC32_GETFLAGS:
		cmd = OCFS2_IOC_GETFLAGS;
		break;
	case OCFS2_IOC32_SETFLAGS:
		cmd = OCFS2_IOC_SETFLAGS;
		break;
	case OCFS2_IOC_RESVSP:
	case OCFS2_IOC_RESVSP64:
	case OCFS2_IOC_UNRESVSP:
	case OCFS2_IOC_UNRESVSP64:
	case OCFS2_IOC_GROUP_EXTEND:
	case OCFS2_IOC_GROUP_ADD:
	case OCFS2_IOC_GROUP_ADD64:
	case OCFS2_IOC_REFLINK:
		break;
	default:
		return -ENOIOCTLCMD;
	}

	return ocfs2_ioctl(file, cmd, arg);
}
#endif
Commit	Line	Data
ca4d147e HP	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
	11	#define MLOG_MASK_PREFIX ML_INODE
	12	#include <cluster/masklog.h>
	13
	14	#include "ocfs2.h"
	15	#include "alloc.h"
	16	#include "dlmglue.h"
b2580103	17	#include "file.h"
ca4d147e HP	18	#include "inode.h"
	19	#include "journal.h"
	20
	21	#include "ocfs2_fs.h"
2d562518	22	#include "ioctl.h"
d659072f	23	#include "resize.h"
bd50873d	24	#include "refcounttree.h"
2d562518	25
ca4d147e HP	26	#include <linux/ext2_fs.h>
	27
	28	static int ocfs2_get_inode_attr(struct inode inode, unsigned flags)
	29	{
	30	int status;
	31
e63aecb6	32	status = ocfs2_inode_lock(inode, NULL, 0);
ca4d147e HP	33	if (status < 0) {
	34	mlog_errno(status);
	35	return status;
	36	}
6e4b0d56	37	ocfs2_get_inode_flags(OCFS2_I(inode));
ca4d147e	38	*flags = OCFS2_I(inode)->ip_attr;
e63aecb6	39	ocfs2_inode_unlock(inode, 0);
ca4d147e HP	40
	41	mlog_exit(status);
	42	return status;
	43	}
	44
	45	static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
	46	unsigned mask)
	47	{
	48	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
	49	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1fabe148	50	handle_t *handle = NULL;
ca4d147e HP	51	struct buffer_head *bh = NULL;
	52	unsigned oldflags;
	53	int status;
	54
	55	mutex_lock(&inode->i_mutex);
	56
e63aecb6	57	status = ocfs2_inode_lock(inode, &bh, 1);
ca4d147e HP	58	if (status < 0) {
	59	mlog_errno(status);
	60	goto bail;
	61	}
	62
ca4d147e	63	status = -EACCES;
3bd858ab	64	if (!is_owner_or_cap(inode))
ca4d147e HP	65	goto bail_unlock;
	66
	67	if (!S_ISDIR(inode->i_mode))
	68	flags &= ~OCFS2_DIRSYNC_FL;
	69
65eff9cc	70	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
ca4d147e HP	71	if (IS_ERR(handle)) {
	72	status = PTR_ERR(handle);
	73	mlog_errno(status);
	74	goto bail_unlock;
	75	}
	76
	77	oldflags = ocfs2_inode->ip_attr;
	78	flags = flags & mask;
	79	flags \|= oldflags & ~mask;
	80
	81	/*
	82	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	83	* the relevant capability.
	84	*/
	85	status = -EPERM;
	86	if ((oldflags & OCFS2_IMMUTABLE_FL) \|\| ((flags ^ oldflags) &
	87	(OCFS2_APPEND_FL \| OCFS2_IMMUTABLE_FL))) {
	88	if (!capable(CAP_LINUX_IMMUTABLE))
	89	goto bail_unlock;
	90	}
	91
	92	ocfs2_inode->ip_attr = flags;
	93	ocfs2_set_inode_flags(inode);
	94
	95	status = ocfs2_mark_inode_dirty(handle, inode, bh);
	96	if (status < 0)
	97	mlog_errno(status);
	98
02dc1af4	99	ocfs2_commit_trans(osb, handle);
ca4d147e	100	bail_unlock:
e63aecb6	101	ocfs2_inode_unlock(inode, 1);
ca4d147e HP	102	bail:
	103	mutex_unlock(&inode->i_mutex);
	104
a81cb88b	105	brelse(bh);
ca4d147e HP	106
	107	mlog_exit(status);
	108	return status;
	109	}
	110
c9ec1488	111	long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ca4d147e	112	{
c9ec1488	113	struct inode *inode = filp->f_path.dentry->d_inode;
ca4d147e	114	unsigned int flags;
d659072f	115	int new_clusters;
ca4d147e	116	int status;
b2580103	117	struct ocfs2_space_resv sr;
7909f2bf	118	struct ocfs2_new_group_input input;
bd50873d TM	119	struct reflink_arguments args;
	120	const char old_path, new_path;
	121	bool preserve;
ca4d147e HP	122
	123	switch (cmd) {
	124	case OCFS2_IOC_GETFLAGS:
	125	status = ocfs2_get_inode_attr(inode, &flags);
	126	if (status < 0)
	127	return status;
	128
	129	flags &= OCFS2_FL_VISIBLE;
	130	return put_user(flags, (int __user *) arg);
	131	case OCFS2_IOC_SETFLAGS:
	132	if (get_user(flags, (int __user *) arg))
	133	return -EFAULT;
	134
42a74f20 DH	135	status = mnt_want_write(filp->f_path.mnt);
	136	if (status)
	137	return status;
	138	status = ocfs2_set_inode_attr(inode, flags,
ca4d147e	139	OCFS2_FL_MODIFIABLE);
42a74f20 DH	140	mnt_drop_write(filp->f_path.mnt);
42a74f20 DH	141	return status;
b2580103 MF	142	case OCFS2_IOC_RESVSP:
	143	case OCFS2_IOC_RESVSP64:
	144	case OCFS2_IOC_UNRESVSP:
	145	case OCFS2_IOC_UNRESVSP64:
	146	if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
	147	return -EFAULT;
	148
	149	return ocfs2_change_file_space(filp, cmd, &sr);
d659072f	150	case OCFS2_IOC_GROUP_EXTEND:
0957f007 MF	151	if (!capable(CAP_SYS_RESOURCE))
	152	return -EPERM;
	153
d659072f TM	154	if (get_user(new_clusters, (int __user *)arg))
	155	return -EFAULT;
	156
	157	return ocfs2_group_extend(inode, new_clusters);
7909f2bf TM	158	case OCFS2_IOC_GROUP_ADD:
7909f2bf TM	159	case OCFS2_IOC_GROUP_ADD64:
0957f007 MF	160	if (!capable(CAP_SYS_RESOURCE))
	161	return -EPERM;
	162
7909f2bf TM	163	if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
	164	return -EFAULT;
	165
	166	return ocfs2_group_add(inode, &input);
bd50873d TM	167	case OCFS2_IOC_REFLINK:
	168	if (copy_from_user(&args, (struct reflink_arguments *)arg,
	169	sizeof(args)))
	170	return -EFAULT;
	171	old_path = (const char *)(unsigned long)args.old_path;
	172	new_path = (const char *)(unsigned long)args.new_path;
	173	preserve = (args.preserve != 0);
	174
	175	return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
ca4d147e HP	176	default:
	177	return -ENOTTY;
	178	}
	179	}
	180
586d232b MF	181	#ifdef CONFIG_COMPAT
	182	long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
	183	{
586d232b MF	184	switch (cmd) {
	185	case OCFS2_IOC32_GETFLAGS:
	186	cmd = OCFS2_IOC_GETFLAGS;
	187	break;
	188	case OCFS2_IOC32_SETFLAGS:
	189	cmd = OCFS2_IOC_SETFLAGS;
	190	break;
b2580103 MF	191	case OCFS2_IOC_RESVSP:
	192	case OCFS2_IOC_RESVSP64:
	193	case OCFS2_IOC_UNRESVSP:
	194	case OCFS2_IOC_UNRESVSP64:
d659072f	195	case OCFS2_IOC_GROUP_EXTEND:
7909f2bf TM	196	case OCFS2_IOC_GROUP_ADD:
7909f2bf TM	197	case OCFS2_IOC_GROUP_ADD64:
bd50873d	198	case OCFS2_IOC_REFLINK:
b2580103	199	break;
586d232b MF	200	default:
	201	return -ENOIOCTLCMD;
	202	}
	203
c9ec1488	204	return ocfs2_ioctl(file, cmd, arg);
586d232b MF	205	}
586d232b MF	206	#endif