path: root/fs/ocfs2/ioctl.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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/blkdev.h>
#include <linux/compat.h>
#include <linux/fileattr.h>

#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 "sysfile.h"
#include "dir.h"
#include "buffer_head_io.h"
#include "suballoc.h"
#include "move_extents.h"

#define o2info_from_user(a, b)	\
		copy_from_user(&(a), (b), sizeof(a))
#define o2info_to_user(a, b)	\
		copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))

/*
 * This is just a best-effort to tell userspace that this request
 * caused the error.
 */
static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
					struct ocfs2_info_request __user *req)
{
	kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
	(void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
}

static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
{
	req->ir_flags |= OCFS2_INFO_FL_FILLED;
}

static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
{
	req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
}

static inline int o2info_coherent(struct ocfs2_info_request *req)
{
	return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
}

int ocfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
	struct inode *inode = d_inode(dentry);
	unsigned int 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);

	fileattr_fill_flags(fa, flags & OCFS2_FL_VISIBLE);

	return status;
}

int ocfs2_fileattr_set(struct user_namespace *mnt_userns,
		       struct dentry *dentry, struct fileattr *fa)
{
	struct inode *inode = d_inode(dentry);
	unsigned int flags = fa->flags;
	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;

	if (fileattr_has_fsx(fa))
		return -EOPNOTSUPP;

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

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

	oldflags = ocfs2_inode->ip_attr;
	flags = flags & OCFS2_FL_MODIFIABLE;
	flags |= oldflags & ~OCFS2_FL_MODIFIABLE;

	/* Check already done by VFS, but repeat with ocfs lock */
	status = -EPERM;
	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
	    !capable(CAP_LINUX_IMMUTABLE))
		goto bail_unlock;

	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		mlog_errno(status);
		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:
	brelse(bh);

	return status;
}

static int ocfs2_info_handle_blocksize(struct inode *inode,
				       struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_blocksize oib;

	if (o2info_from_user(oib, req))
		return -EFAULT;

	oib.ib_blocksize = inode->i_sb->s_blocksize;

	o2info_set_request_filled(&oib.ib_req);

	if (o2info_to_user(oib, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_clustersize(struct inode *inode,
					 struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_clustersize oic;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oic, req))
		return -EFAULT;

	oic.ic_clustersize = osb->s_clustersize;

	o2info_set_request_filled(&oic.ic_req);

	if (o2info_to_user(oic, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_maxslots(struct inode *inode,
				      struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_maxslots oim;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oim, req))
		return -EFAULT;

	oim.im_max_slots = osb->max_slots;

	o2info_set_request_filled(&oim.im_req);

	if (o2info_to_user(oim, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_label(struct inode *inode,
				   struct ocfs2_info_request __user *req)
{
	struct ocfs2_info_label oil;
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

	if (o2info_from_user(oil, req))
		return -EFAULT;

	memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);

	o2info_set_request_filled(&oil.il_req);

	if (o2info_to_user(oil, req))
		return -EFAULT;

	return 0;
}

static int ocfs2_info_handle_uuid(struct inode *