[linux.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>
#include <linux/smp_lock.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 <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);

	if (bh)
		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;

	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);
	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:
		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>
6953b4c0	10	#include <linux/smp_lock.h>
ca4d147e HP	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"
b2580103	18	#include "file.h"
ca4d147e HP	19	#include "inode.h"
	20	#include "journal.h"
	21
	22	#include "ocfs2_fs.h"
2d562518	23	#include "ioctl.h"
d659072f	24	#include "resize.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
	105	if (bh)
	106	brelse(bh);
	107
	108	mlog_exit(status);
	109	return status;
	110	}
	111
c9ec1488	112	long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ca4d147e	113	{
c9ec1488	114	struct inode *inode = filp->f_path.dentry->d_inode;
ca4d147e	115	unsigned int flags;
d659072f	116	int new_clusters;
ca4d147e	117	int status;
b2580103	118	struct ocfs2_space_resv sr;
7909f2bf	119	struct ocfs2_new_group_input input;
ca4d147e HP	120
	121	switch (cmd) {
	122	case OCFS2_IOC_GETFLAGS:
	123	status = ocfs2_get_inode_attr(inode, &flags);
	124	if (status < 0)
	125	return status;
	126
	127	flags &= OCFS2_FL_VISIBLE;
	128	return put_user(flags, (int __user *) arg);
	129	case OCFS2_IOC_SETFLAGS:
	130	if (get_user(flags, (int __user *) arg))
	131	return -EFAULT;
	132
42a74f20 DH	133	status = mnt_want_write(filp->f_path.mnt);
	134	if (status)
	135	return status;
	136	status = ocfs2_set_inode_attr(inode, flags,
ca4d147e	137	OCFS2_FL_MODIFIABLE);
42a74f20 DH	138	mnt_drop_write(filp->f_path.mnt);
42a74f20 DH	139	return status;
b2580103 MF	140	case OCFS2_IOC_RESVSP:
	141	case OCFS2_IOC_RESVSP64:
	142	case OCFS2_IOC_UNRESVSP:
	143	case OCFS2_IOC_UNRESVSP64:
	144	if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
	145	return -EFAULT;
	146
	147	return ocfs2_change_file_space(filp, cmd, &sr);
d659072f	148	case OCFS2_IOC_GROUP_EXTEND:
0957f007 MF	149	if (!capable(CAP_SYS_RESOURCE))
	150	return -EPERM;
	151
d659072f TM	152	if (get_user(new_clusters, (int __user *)arg))
	153	return -EFAULT;
	154
	155	return ocfs2_group_extend(inode, new_clusters);
7909f2bf TM	156	case OCFS2_IOC_GROUP_ADD:
7909f2bf TM	157	case OCFS2_IOC_GROUP_ADD64:
0957f007 MF	158	if (!capable(CAP_SYS_RESOURCE))
	159	return -EPERM;
	160
7909f2bf TM	161	if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
	162	return -EFAULT;
	163
	164	return ocfs2_group_add(inode, &input);
ca4d147e HP	165	default:
	166	return -ENOTTY;
	167	}
	168	}
	169
586d232b MF	170	#ifdef CONFIG_COMPAT
	171	long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
	172	{
586d232b MF	173	switch (cmd) {
	174	case OCFS2_IOC32_GETFLAGS:
	175	cmd = OCFS2_IOC_GETFLAGS;
	176	break;
	177	case OCFS2_IOC32_SETFLAGS:
	178	cmd = OCFS2_IOC_SETFLAGS;
	179	break;
b2580103 MF	180	case OCFS2_IOC_RESVSP:
	181	case OCFS2_IOC_RESVSP64:
	182	case OCFS2_IOC_UNRESVSP:
	183	case OCFS2_IOC_UNRESVSP64:
d659072f	184	case OCFS2_IOC_GROUP_EXTEND:
7909f2bf TM	185	case OCFS2_IOC_GROUP_ADD:
7909f2bf TM	186	case OCFS2_IOC_GROUP_ADD64:
b2580103	187	break;
586d232b MF	188	default:
	189	return -ENOIOCTLCMD;
	190	}
	191
c9ec1488	192	return ocfs2_ioctl(file, cmd, arg);
586d232b MF	193	}
586d232b MF	194	#endif