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/*
* 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 "inode.h"
#include "journal.h"
#include "ocfs2_fs.h"
#include "ioctl.h"
#include <linux/ext2_fs.h>
static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
{
int status;
status = ocfs2_meta_lock(inode, NULL, NULL, 0);
if (status < 0) {
mlog_errno(status);
return status;
}
*flags = OCFS2_I(inode)->ip_attr;
ocfs2_meta_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);
struct ocfs2_journal_handle *handle = NULL;
struct buffer_head *bh = NULL;
unsigned oldflags;
int status;
mutex_lock(&inode->i_mutex);
status = ocfs2_meta_lock(inode, NULL, &bh, 1);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = -EROFS;
if (IS_RDONLY(inode))
goto bail_unlock;
status = -EACCES;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
goto bail_unlock;
if (!S_ISDIR(inode->i_mode))
flags &= ~OCFS2_DIRSYNC_FL;
handle = ocfs2_start_trans(osb, NULL, 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(handle);
bail_unlock:
ocfs2_meta_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 status;
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);
default:
return -ENOTTY;
}
}
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