[deliverable/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>

#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 = -EROFS;
	if (IS_RDONLY(inode))
		goto bail_unlock;

	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;
}

int ocfs2_ioctl(struct inode * inode, struct file * filp,
	unsigned int cmd, unsigned long arg)
{
	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;

		return ocfs2_set_inode_attr(inode, flags,
			OCFS2_FL_MODIFIABLE);
	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)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	int ret;

	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;
	}

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