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move v_trace from bhv_vnode to xfs_inode

struct bhv_vnode is on it's way out, so move the trace buffer to the
XFS inode.  Note that this makes the tracing macros rather misnamed,
but this kind of fallout will be fixed up incrementally later on.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:29498a by kenmcd.

  move v_trace from bhv_vnode to xfs_inode

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_rtalloc.h"
#include "xfs_itable.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_bmap.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_dfrag.h"
#include "xfs_fsops.h"
#include "xfs_vnodeops.h"

#include <linux/capability.h>
#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/pagemap.h>

/*
 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
 * a file or fs handle.
 *
 * XFS_IOC_PATH_TO_FSHANDLE
 *    returns fs handle for a mount point or path within that mount point
 * XFS_IOC_FD_TO_HANDLE
 *    returns full handle for a FD opened in user space
 * XFS_IOC_PATH_TO_HANDLE
 *    returns full handle for a path
 */
STATIC int
xfs_find_handle(
	unsigned int		cmd,
	void			__user *arg)
{
	int			hsize;
	xfs_handle_t		handle;
	xfs_fsop_handlereq_t	hreq;
	struct inode		*inode;
	bhv_vnode_t		*vp;

	if (copy_from_user(&hreq, arg, sizeof(hreq)))
		return -XFS_ERROR(EFAULT);

	memset((char *)&handle, 0, sizeof(handle));

	switch (cmd) {
	case XFS_IOC_PATH_TO_FSHANDLE:
	case XFS_IOC_PATH_TO_HANDLE: {
		struct nameidata	nd;
		int			error;

		error = user_path_walk_link((const char __user *)hreq.path, &nd);
		if (error)
			return error;

		ASSERT(nd.dentry);
		ASSERT(nd.dentry->d_inode);
		inode = igrab(nd.dentry->d_inode);
		path_release(&nd);
		break;
	}

	case XFS_IOC_FD_TO_HANDLE: {
		struct file	*file;

		file = fget(hreq.fd);
		if (!file)
		    return -EBADF;

		ASSERT(file->f_path.dentry);
		ASSERT(file->f_path.dentry->d_inode);
		inode = igrab(file->f_path.dentry->d_inode);
		fput(file);
		break;
	}

	default:
		ASSERT(0);
		return -XFS_ERROR(EINVAL);
	}

	if (inode->i_sb->s_magic != XFS_SB_MAGIC) {
		/* we're not in XFS anymore, Toto */
		iput(inode);
		return -XFS_ERROR(EINVAL);
	}

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
	case S_IFDIR:
	case S_IFLNK:
		break;
	default:
		iput(inode);
		return -XFS_ERROR(EBADF);
	}

	/* we need the vnode */
	vp = vn_from_inode(inode);

	/* now we can grab the fsid */
	memcpy(&handle.ha_fsid, XFS_MTOVFS(XFS_I(inode)->i_mount)->vfs_altfsid,
			sizeof(xfs_fsid_t));
	hsize = sizeof(xfs_fsid_t);

	if (cmd != XFS_IOC_PATH_TO_FSHANDLE) {
		xfs_inode_t	*ip;
		int		lock_mode;

		/* need to get access to the xfs_inode to read the generation */
		ip = xfs_vtoi(vp);
		ASSERT(ip);
		lock_mode = xfs_ilock_map_shared(ip);

		/* fill in fid section of handle from inode */
		handle.ha_fid.xfs_fid_len = sizeof(xfs_fid_t) -
					    sizeof(handle.ha_fid.xfs_fid_len);
		handle.ha_fid.xfs_fid_pad = 0;
		handle.ha_fid.xfs_fid_gen = ip->i_d.di_gen;
		handle.ha_fid.xfs_fid_ino = ip->i_ino;

		xfs_iunlock_map_shared(ip, lock_mode);

		hsize = XFS_HSIZE(handle);
	}

	/* now copy our handle into the user buffer & write out the size */
	if (copy_to_user(hreq.ohandle, &handle, hsize) ||
	    copy_to_user(hreq.ohandlen, &hsize, sizeof(__s32))) {
		iput(inode);
		return -XFS_ERROR(EFAULT);
	}

	iput(inode);
	return 0;
}


/*
 * Convert userspace handle data into vnode (and inode).
 * We [ab]use the fact that all the fsop_handlereq ioctl calls
 * have a data structure argument whose first component is always
 * a xfs_fsop_handlereq_t, so we can cast to and from this type.
 * This allows us to optimise the copy_from_user calls and gives
 * a handy, shared routine.
 *
 * If no error, caller must always VN_RELE the returned vp.
 */
STATIC int
xfs_vget_fsop_handlereq(
	xfs_mount_t		*mp,
	struct inode		*parinode,	/* parent inode pointer    */
	xfs_fsop_handlereq_t	*hreq,
	bhv_vnode_t		**vp,
	struct inode		**inode)
{
	void			__user *hanp;
	size_t			hlen;
	xfs_fid_t		*xfid;
	xfs_handle_t		*handlep;
	xfs_handle_t		handle;
	xfs_inode_t		*ip;
	struct inode		*inodep;
	bhv_vnode_t		*vpp;
	xfs_ino_t		ino;
	__u32			igen;
	int			error;

	/*
	 * Only allow handle opens under a directory.
	 */
	if (!S_ISDIR(parinode->i_mode))
		return XFS_ERROR(ENOTDIR);

	hanp = hreq->ihandle;
	hlen = hreq->ihandlen;
	handlep = &handle;

	if (hlen < sizeof(handlep->ha_fsid) || hlen > sizeof(*handlep))
		return XFS_ERROR(EINVAL);
	if (copy_from_user(handlep, hanp, hlen))
		return XFS_ERROR(EFAULT);
	if (hlen < sizeof(*handlep))
		memset(((char *)handlep) + hlen, 0, sizeof(*handlep) - hlen);
	if (hlen > sizeof(handlep->ha_fsid)) {
		if (handlep->ha_fid.xfs_fid_len !=
				(hlen - sizeof(handlep->ha_fsid)
					- sizeof(handlep->ha_fid.xfs_fid_len))
		    || handlep->ha_fid.xfs_fid_pad)
			return XFS_ERROR(EINVAL);
	}

	/*
	 * Crack the handle, obtain the inode # & generation #
	 */
	xfid = (struct xfs_fid *)&handlep->ha_fid;
	if (xfid->xfs_fid_len == sizeof(*xfid) - sizeof(xfid->xfs_fid_len)) {
		ino  = xfid->xfs_fid_ino;
		igen = xfid->xfs_fid_gen;
	} else {
		return XFS_ERROR(EINVAL);
	}

	/*
	 * Get the XFS inode, building a vnode to go with it.
	 */
	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
	if (error)
		return error;
	if (ip == NULL)
		return XFS_ERROR(EIO);
	if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
		xfs_iput_new(ip, XFS_ILOCK_SHARED);
		return XFS_ERROR(ENOENT);
	}

	vpp = XFS_ITOV(ip);
	inodep = vn_to_inode(vpp);
	xfs_iunlock(ip, XFS_ILOCK_SHARED);

	*vp = vpp;
	*inode = inodep;
	return 0;
}

STATIC int
xfs_open_by_handle(
	xfs_mount_t		*mp,
	void			__user *arg,
	struct file		*parfilp,
	struct inode		*parinode)
{
	int			error;
	int			new_fd;
	int			permflag;
	struct file		*filp;
	struct inode		*inode;
	struct dentry		*dentry;
	bhv_vnode_t		*vp;
	xfs_fsop_handlereq_t	hreq;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
		return -XFS_ERROR(EFAULT);

	error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &vp, &inode);
	if (error)
		return -error;

	/* Restrict xfs_open_by_handle to directories & regular files. */
	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
		iput(inode);
		return -XFS_ERROR(EINVAL);
	}

#if BITS_PER_LONG != 32
	hreq.oflags |= O_LARGEFILE;
#endif
	/* Put open permission in namei format. */
	permflag = hreq.oflags;
	if ((permflag+1) & O_ACCMODE)
		permflag++;
	if (permflag & O_TRUNC)
		permflag |= 2;

	if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) &&
	    (permflag & FMODE_WRITE) && IS_APPEND(inode)) {
		iput(inode);
		return -XFS_ERROR(EPERM);
	}

	if ((permflag & FMODE_WRITE) && IS_IMMUTABLE(inode)) {
		iput(inode);
		return -XFS_ERROR(EACCES);
	}

	/* Can't write directories. */
	if ( S_ISDIR(inode->i_mode) && (permflag & FMODE_WRITE)) {
		iput(inode);
		return -XFS_ERROR(EISDIR);
	}

	if ((new_fd = get_unused_fd()) < 0) {
		iput(inode);
		return new_fd;
	}

	dentry = d_alloc_anon(inode);
	if (dentry == NULL) {
		iput(inode);
		put_unused_fd(new_fd);
		return -XFS_ERROR(ENOMEM);
	}

	/* Ensure umount returns EBUSY on umounts while this file is open. */
	mntget(parfilp->f_path.mnt);

	/* Create file pointer. */
	filp = dentry_open(dentry, parfilp->f_path.mnt, hreq.oflags);
	if (IS_ERR(filp)) {
		put_unused_fd(new_fd);
		return -XFS_ERROR(-PTR_ERR(filp));
	}
	if (inode->i_mode & S_IFREG) {
		/* invisible operation should not change atime */
		filp->f_flags |= O_NOATIME;
		filp->f_op = &xfs_invis_file_operations;
	}

	fd_install(new_fd, filp);
	return new_fd;
}

/*
 * This is a copy from fs/namei.c:vfs_readlink(), except for removing it's
 * unused first argument.
 */
STATIC int
do_readlink(
	char __user		*buffer,
	int			buflen,
	const char		*link)
{
        int len;

	len = PTR_ERR(link);
	if (IS_ERR(link))
		goto out;

	len = strlen(link);
	if (len > (unsigned) buflen)
		len = buflen;
	if (copy_to_user(buffer, link, len))
		len = -EFAULT;
 out:
	return len;
}


STATIC int
xfs_readlink_by_handle(
	xfs_mount_t		*mp,
	void			__user *arg,
	struct inode		*parinode)
{
	struct inode		*inode;
	xfs_fsop_handlereq_t	hreq;
	bhv_vnode_t		*vp;
	__u32			olen;
	void			*link;
	int			error;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
		return -XFS_ERROR(EFAULT);

	error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &vp, &inode);
	if (error)
		return -error;

	/* Restrict this handle operation to symlinks only. */
	if (!S_ISLNK(inode->i_mode)) {
		error = -XFS_ERROR(EINVAL);
		goto out_iput;
	}

	if (copy_from_user(&olen, hreq.ohandlen, sizeof(__u32))) {
		error = -XFS_ERROR(EFAULT);
		goto out_iput;
	}

	link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
	if (!link)
		goto out_iput;

	error = -xfs_readlink(XFS_I(inode), link);
	if (error)
		goto out_kfree;
	error = do_readlink(hreq.ohandle, olen, link);
	if (error)
		goto out_kfree;

 out_kfree:
	kfree(link);
 out_iput:
	iput(inode);
	return error;
}

STATIC int
xfs_fssetdm_by_handle(
	xfs_mount_t		*mp,
	void			__user *arg,
	struct inode		*parinode)
{
	int			error;
	struct fsdmidata	fsd;
	xfs_fsop_setdm_handlereq_t dmhreq;
	struct inode		*inode;
	bhv_vnode_t		*vp;

	if (!capable(CAP_MKNOD))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&dmhreq, arg, sizeof(xfs_fsop_setdm_handlereq_t)))
		return -XFS_ERROR(EFAULT);

	error = xfs_vget_fsop_handlereq(mp, parinode, &dmhreq.hreq, &vp, &inode);
	if (error)
		return -error;

	if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
		VN_RELE(vp);
		return -XFS_ERROR(EPERM);
	}

	if (copy_from_user(&fsd, dmhreq.data, sizeof(fsd))) {
		VN_RELE(vp);
		return -XFS_ERROR(EFAULT);
	}

	error = xfs_set_dmattrs(xfs_vtoi(vp),
			fsd.fsd_dmevmask, fsd.fsd_dmstate);

	VN_RELE(vp);
	if (error)
		return -error;
	return 0;
}

STATIC int
xfs_attrlist_by_handle(
	xfs_mount_t		*mp,
	void			__user *arg,
	struct inode		*parinode)
{
	int			error;
	attrlist_cursor_kern_t	*cursor;
	xfs_fsop_attrlist_handlereq_t al_hreq;
	struct inode		*inode;
	bhv_vnode_t		*vp;
	char			*kbuf;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&al_hreq, arg, sizeof(xfs_fsop_attrlist_handlereq_t)))
		return -XFS_ERROR(EFAULT);
	if (al_hreq.buflen > XATTR_LIST_MAX)
		return -XFS_ERROR(EINVAL);

	error = xfs_vget_fsop_handlereq(mp, parinode, &al_hreq.hreq,
			&vp, &inode);
	if (error)
		goto out;

	kbuf = kmalloc(al_hreq.buflen, GFP_KERNEL);
	if (!kbuf)
		goto out_vn_rele;

	cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
	error = xfs_attr_list(XFS_I(inode), kbuf, al_hreq.buflen,
					al_hreq.flags, cursor);
	if (error)
		goto out_kfree;

	if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
		error = -EFAULT;

 out_kfree:
	kfree(kbuf);
 out_vn_rele:
	VN_RELE(vp);
 out:
	return -error;
}

STATIC int
xfs_attrmulti_attr_get(
	struct inode		*inode,
	char			*name,
	char			__user *ubuf,
	__uint32_t		*len,
	__uint32_t		flags)
{
	char			*kbuf;
	int			error = EFAULT;
	
	if (*len > XATTR_SIZE_MAX)
		return EINVAL;
	kbuf = kmalloc(*len, GFP_KERNEL);
	if (!kbuf)
		return ENOMEM;

	error = xfs_attr_get(XFS_I(inode), name, kbuf, len, flags, NULL);
	if (error)
		goto out_kfree;

	if (copy_to_user(ubuf, kbuf, *len))
		error = EFAULT;

 out_kfree:
	kfree(kbuf);
	return error;
}

STATIC int
xfs_attrmulti_attr_set(
	struct inode		*inode,
	char			*name,
	const char		__user *ubuf,
	__uint32_t		len,
	__uint32_t		flags)
{
	char			*kbuf;
	int			error = EFAULT;

	if (IS_RDONLY(inode))
		return -EROFS;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		return EPERM;
	if (len > XATTR_SIZE_MAX)
		return EINVAL;

	kbuf = kmalloc(len, GFP_KERNEL);
	if (!kbuf)
		return ENOMEM;

	if (copy_from_user(kbuf, ubuf, len))
		goto out_kfree;
			
	error = xfs_attr_set(XFS_I(inode), name, kbuf, len, flags);

 out_kfree:
	kfree(kbuf);
	return error;
}

STATIC int
xfs_attrmulti_attr_remove(
	struct inode		*inode,
	char			*name,
	__uint32_t		flags)
{
	if (IS_RDONLY(inode))
		return -EROFS;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		return EPERM;
	return xfs_attr_remove(XFS_I(inode), name, flags);
}

STATIC int
xfs_attrmulti_by_handle(
	xfs_mount_t		*mp,
	void			__user *arg,
	struct inode		*parinode)
{
	int			error;
	xfs_attr_multiop_t	*ops;
	xfs_fsop_attrmulti_handlereq_t am_hreq;
	struct inode		*inode;
	bhv_vnode_t		*vp;
	unsigned int		i, size;
	char			*attr_name;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
		return -XFS_ERROR(EFAULT);

	error = xfs_vget_fsop_handlereq(mp, parinode, &am_hreq.hreq, &vp, &inode);
	if (error)
		goto out;

	error = E2BIG;
	size = am_hreq.opcount * sizeof(attr_multiop_t);
	if (!size || size > 16 * PAGE_SIZE)
		goto out_vn_rele;

	error = ENOMEM;
	ops = kmalloc(size, GFP_KERNEL);
	if (!ops)
		goto out_vn_rele;

	error = EFAULT;
	if (copy_from_user(ops, am_hreq.ops, size))
		goto out_kfree_ops;

	attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
	if (!attr_name)
		goto out_kfree_ops;


	error = 0;
	for (i = 0; i < am_hreq.opcount; i++) {
		ops[i].am_error = strncpy_from_user(attr_name,
				ops[i].am_attrname, MAXNAMELEN);
		if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
			error = -ERANGE;
		if (ops[i].am_error < 0)
			break;

		switch (ops[i].am_opcode) {
		case ATTR_OP_GET:
			ops[i].am_error = xfs_attrmulti_attr_get(inode,
					attr_name, ops[i].am_attrvalue,
					&ops[i].am_length, ops[i].am_flags);
			break;
		case ATTR_OP_SET:
			ops[i].am_error = xfs_attrmulti_attr_set(inode,
					attr_name, ops[i].am_attrvalue,
					ops[i].am_length, ops[i].am_flags);
			break;
		case ATTR_OP_REMOVE:
			ops[i].am_error = xfs_attrmulti_attr_remove(inode,
					attr_name, ops[i].am_flags);
			break;
		default:
			ops[i].am_error = EINVAL;
		}
	}

	if (copy_to_user(am_hreq.ops, ops, size))
		error = XFS_ERROR(EFAULT);

	kfree(attr_name);
 out_kfree_ops:
	kfree(ops);
 out_vn_rele:
	VN_RELE(vp);
 out:
	return -error;
}

/* prototypes for a few of the stack-hungry cases that have
 * their own functions.  Functions are defined after their use
 * so gcc doesn't get fancy and inline them with -03 */

STATIC int
xfs_ioc_space(
	struct xfs_inode	*ip,
	struct inode		*inode,
	struct file		*filp,
	int			flags,
	unsigned int		cmd,
	void			__user *arg);

STATIC int
xfs_ioc_bulkstat(
	xfs_mount_t		*mp,
	unsigned int		cmd,
	void			__user *arg);

STATIC int
xfs_ioc_fsgeometry_v1(
	xfs_mount_t		*mp,
	void			__user *arg);

STATIC int
xfs_ioc_fsgeometry(
	xfs_mount_t		*mp,
	void			__user *arg);

STATIC int
xfs_ioc_xattr(
	bhv_vnode_t		*vp,
	xfs_inode_t		*ip,
	struct file		*filp,
	unsigned int		cmd,
	void			__user *arg);

STATIC int
xfs_ioc_getbmap(
	struct xfs_inode	*ip,
	int			flags,
	unsigned int		cmd,
	void			__user *arg);

STATIC int
xfs_ioc_getbmapx(
	struct xfs_inode	*ip,
	void			__user *arg);

int
xfs_ioctl(
	xfs_inode_t		*ip,
	struct file		*filp,
	int			ioflags,
	unsigned int		cmd,
	void			__user *arg)
{
	struct inode		*inode = filp->f_path.dentry->d_inode;
	bhv_vnode_t		*vp = vn_from_inode(inode);
	xfs_mount_t		*mp = ip->i_mount;
	int			error;

	vn_trace_entry(XFS_I(inode), "xfs_ioctl", (inst_t *)__return_address);

	switch (cmd) {

	case XFS_IOC_ALLOCSP:
	case XFS_IOC_FREESP:
	case XFS_IOC_RESVSP:
	case XFS_IOC_UNRESVSP:
	case XFS_IOC_ALLOCSP64:
	case XFS_IOC_FREESP64:
	case XFS_IOC_RESVSP64:
	case XFS_IOC_UNRESVSP64:
		/*
		 * Only allow the sys admin to reserve space unless
		 * unwritten extents are enabled.
		 */
		if (!XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) &&
		    !capable(CAP_SYS_ADMIN))
			return -EPERM;

		return xfs_ioc_space(ip, inode, filp, ioflags, cmd, arg);

	case XFS_IOC_DIOINFO: {
		struct dioattr	da;
		xfs_buftarg_t	*target =
			(ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
			mp->m_rtdev_targp : mp->m_ddev_targp;

		da.d_mem = da.d_miniosz = 1 << target->bt_sshift;
		da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);

		if (copy_to_user(arg, &da, sizeof(da)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_FSBULKSTAT_SINGLE:
	case XFS_IOC_FSBULKSTAT:
	case XFS_IOC_FSINUMBERS:
		return xfs_ioc_bulkstat(mp, cmd, arg);

	case XFS_IOC_FSGEOMETRY_V1:
		return xfs_ioc_fsgeometry_v1(mp, arg);

	case XFS_IOC_FSGEOMETRY:
		return xfs_ioc_fsgeometry(mp, arg);

	case XFS_IOC_GETVERSION:
		return put_user(inode->i_generation, (int __user *)arg);

	case XFS_IOC_GETXFLAGS:
	case XFS_IOC_SETXFLAGS:
	case XFS_IOC_FSGETXATTR:
	case XFS_IOC_FSSETXATTR:
	case XFS_IOC_FSGETXATTRA:
		return xfs_ioc_xattr(vp, ip, filp, cmd, arg);

	case XFS_IOC_FSSETDM: {
		struct fsdmidata	dmi;

		if (copy_from_user(&dmi, arg, sizeof(dmi)))
			return -XFS_ERROR(EFAULT);

		error = xfs_set_dmattrs(ip, dmi.fsd_dmevmask,
				dmi.fsd_dmstate);
		return -error;
	}

	case XFS_IOC_GETBMAP:
	case XFS_IOC_GETBMAPA:
		return xfs_ioc_getbmap(ip, ioflags, cmd, arg);

	case XFS_IOC_GETBMAPX:
		return xfs_ioc_getbmapx(ip, arg);

	case XFS_IOC_FD_TO_HANDLE:
	case XFS_IOC_PATH_TO_HANDLE:
	case XFS_IOC_PATH_TO_FSHANDLE:
		return xfs_find_handle(cmd, arg);

	case XFS_IOC_OPEN_BY_HANDLE:
		return xfs_open_by_handle(mp, arg, filp, inode);

	case XFS_IOC_FSSETDM_BY_HANDLE:
		return xfs_fssetdm_by_handle(mp, arg, inode);

	case XFS_IOC_READLINK_BY_HANDLE:
		return xfs_readlink_by_handle(mp, arg, inode);

	case XFS_IOC_ATTRLIST_BY_HANDLE:
		return xfs_attrlist_by_handle(mp, arg, inode);

	case XFS_IOC_ATTRMULTI_BY_HANDLE:
		return xfs_attrmulti_by_handle(mp, arg, inode);

	case XFS_IOC_SWAPEXT: {
		error = xfs_swapext((struct xfs_swapext __user *)arg);
		return -error;
	}

	case XFS_IOC_FSCOUNTS: {
		xfs_fsop_counts_t out;

		error = xfs_fs_counts(mp, &out);
		if (error)
			return -error;

		if (copy_to_user(arg, &out, sizeof(out)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_SET_RESBLKS: {
		xfs_fsop_resblks_t inout;
		__uint64_t	   in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (copy_from_user(&inout, arg, sizeof(inout)))
			return -XFS_ERROR(EFAULT);

		/* input parameter is passed in resblks field of structure */
		in = inout.resblks;
		error = xfs_reserve_blocks(mp, &in, &inout);
		if (error)
			return -error;

		if (copy_to_user(arg, &inout, sizeof(inout)))
			return -XFS_ERROR(EFAULT);
		return 0;
	}

	case XFS_IOC_GET_RESBLKS: {
		xfs_fsop_resblks_t out;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		error = xfs_reserve_blocks(mp, NULL, &out);
		if (error)
			return -error;

		if (copy_to_user(arg, &out, sizeof(out)))
			return -XFS_ERROR(EFAULT);

		return 0;
	}

	case XFS_IOC_FSGROWFSDATA: {
		xfs_growfs_data_t in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_data(mp, &in);
		return -error;
	}

	case XFS_IOC_FSGROWFSLOG: {
		xfs_growfs_log_t in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_log(mp, &in);
		return -error;
	}

	case XFS_IOC_FSGROWFSRT: {
		xfs_growfs_rt_t in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_growfs_rt(mp, &in);
		return -error;
	}

	case XFS_IOC_FREEZE:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (inode->i_sb->s_frozen == SB_UNFROZEN)
			freeze_bdev(inode->i_sb->s_bdev);
		return 0;

	case XFS_IOC_THAW:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		if (inode->i_sb->s_frozen != SB_UNFROZEN)
			thaw_bdev(inode->i_sb->s_bdev, inode->i_sb);
		return 0;

	case XFS_IOC_GOINGDOWN: {
		__uint32_t in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (get_user(in, (__uint32_t __user *)arg))
			return -XFS_ERROR(EFAULT);

		error = xfs_fs_goingdown(mp, in);
		return -error;
	}

	case XFS_IOC_ERROR_INJECTION: {
		xfs_error_injection_t in;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (copy_from_user(&in, arg, sizeof(in)))
			return -XFS_ERROR(EFAULT);

		error = xfs_errortag_add(in.errtag, mp);
		return -error;
	}

	case XFS_IOC_ERROR_CLEARALL:
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		error = xfs_errortag_clearall(mp);
		return -error;

	default:
		return -ENOTTY;
	}
}

STATIC int
xfs_ioc_space(
	struct xfs_inode	*ip,
	struct inode		*inode,
	struct file		*filp,
	int			ioflags,
	unsigned int		cmd,
	void			__user *arg)
{
	xfs_flock64_t		bf;
	int			attr_flags = 0;
	int			error;

	if (inode->i_flags & (S_IMMUTABLE|S_APPEND))
		return -XFS_ERROR(EPERM);

	if (!(filp->f_mode & FMODE_WRITE))
		return -XFS_ERROR(EBADF);

	if (!S_ISREG(inode->i_mode))
		return -XFS_ERROR(EINVAL);

	if (copy_from_user(&bf, arg, sizeof(bf)))
		return -XFS_ERROR(EFAULT);

	if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
		attr_flags |= ATTR_NONBLOCK;
	if (ioflags & IO_INVIS)
		attr_flags |= ATTR_DMI;

	error = xfs_change_file_space(ip, cmd, &bf, filp->f_pos,
					      NULL, attr_flags);
	return -error;
}

STATIC int
xfs_ioc_bulkstat(
	xfs_mount_t		*mp,
	unsigned int		cmd,
	void			__user *arg)
{
	xfs_fsop_bulkreq_t	bulkreq;
	int			count;	/* # of records returned */
	xfs_ino_t		inlast;	/* last inode number */
	int			done;
	int			error;

	/* done = 1 if there are more stats to get and if bulkstat */
	/* should be called again (unused here, but used in dmapi) */

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (XFS_FORCED_SHUTDOWN(mp))
		return -XFS_ERROR(EIO);

	if (copy_from_user(&bulkreq, arg, sizeof(xfs_fsop_bulkreq_t)))
		return -XFS_ERROR(EFAULT);

	if (copy_from_user(&inlast, bulkreq.lastip, sizeof(__s64)))
		return -XFS_ERROR(EFAULT);

	if ((count = bulkreq.icount) <= 0)
		return -XFS_ERROR(EINVAL);

	if (cmd == XFS_IOC_FSINUMBERS)
		error = xfs_inumbers(mp, &inlast, &count,
					bulkreq.ubuffer, xfs_inumbers_fmt);
	else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE)
		error = xfs_bulkstat_single(mp, &inlast,
						bulkreq.ubuffer, &done);
	else {	/* XFS_IOC_FSBULKSTAT */
		if (count == 1 && inlast != 0) {
			inlast++;
			error = xfs_bulkstat_single(mp, &inlast,
					bulkreq.ubuffer, &done);
		} else {
			error = xfs_bulkstat(mp, &inlast, &count,
				(bulkstat_one_pf)xfs_bulkstat_one, NULL,
				sizeof(xfs_bstat_t), bulkreq.ubuffer,
				BULKSTAT_FG_QUICK, &done);
		}
	}

	if (error)
		return -error;

	if (bulkreq.ocount != NULL) {
		if (copy_to_user(bulkreq.lastip, &inlast,
						sizeof(xfs_ino_t)))
			return -XFS_ERROR(EFAULT);

		if (copy_to_user(bulkreq.ocount, &count, sizeof(count)))
			return -XFS_ERROR(EFAULT);
	}

	return 0;
}

STATIC int
xfs_ioc_fsgeometry_v1(
	xfs_mount_t		*mp,
	void			__user *arg)
{
	xfs_fsop_geom_v1_t	fsgeo;
	int			error;

	error = xfs_fs_geometry(mp, (xfs_fsop_geom_t *)&fsgeo, 3);
	if (error)
		return -error;

	if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

STATIC int
xfs_ioc_fsgeometry(
	xfs_mount_t		*mp,
	void			__user *arg)
{
	xfs_fsop_geom_t		fsgeo;
	int			error;

	error = xfs_fs_geometry(mp, &fsgeo, 4);
	if (error)
		return -error;

	if (copy_to_user(arg, &fsgeo, sizeof(fsgeo)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

/*
 * Linux extended inode flags interface.
 */

STATIC unsigned int
xfs_merge_ioc_xflags(
	unsigned int	flags,
	unsigned int	start)
{
	unsigned int	xflags = start;

	if (flags & FS_IMMUTABLE_FL)
		xflags |= XFS_XFLAG_IMMUTABLE;
	else
		xflags &= ~XFS_XFLAG_IMMUTABLE;
	if (flags & FS_APPEND_FL)
		xflags |= XFS_XFLAG_APPEND;
	else
		xflags &= ~XFS_XFLAG_APPEND;
	if (flags & FS_SYNC_FL)
		xflags |= XFS_XFLAG_SYNC;
	else
		xflags &= ~XFS_XFLAG_SYNC;
	if (flags & FS_NOATIME_FL)
		xflags |= XFS_XFLAG_NOATIME;
	else
		xflags &= ~XFS_XFLAG_NOATIME;
	if (flags & FS_NODUMP_FL)
		xflags |= XFS_XFLAG_NODUMP;
	else
		xflags &= ~XFS_XFLAG_NODUMP;

	return xflags;
}

STATIC unsigned int
xfs_di2lxflags(
	__uint16_t	di_flags)
{
	unsigned int	flags = 0;

	if (di_flags & XFS_DIFLAG_IMMUTABLE)
		flags |= FS_IMMUTABLE_FL;
	if (di_flags & XFS_DIFLAG_APPEND)
		flags |= FS_APPEND_FL;
	if (di_flags & XFS_DIFLAG_SYNC)
		flags |= FS_SYNC_FL;
	if (di_flags & XFS_DIFLAG_NOATIME)
		flags |= FS_NOATIME_FL;
	if (di_flags & XFS_DIFLAG_NODUMP)
		flags |= FS_NODUMP_FL;
	return flags;
}

STATIC int
xfs_ioc_xattr(
	bhv_vnode_t		*vp,
	xfs_inode_t		*ip,
	struct file		*filp,
	unsigned int		cmd,
	void			__user *arg)
{
	struct fsxattr		fa;
	struct bhv_vattr	*vattr;
	int			error = 0;
	int			attr_flags;
	unsigned int		flags;

	vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
	if (unlikely(!vattr))
		return -ENOMEM;

	switch (cmd) {
	case XFS_IOC_FSGETXATTR: {
		vattr->va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | \
				 XFS_AT_NEXTENTS | XFS_AT_PROJID;
		error = xfs_getattr(ip, vattr, 0);
		if (unlikely(error)) {
			error = -error;
			break;
		}

		fa.fsx_xflags	= vattr->va_xflags;
		fa.fsx_extsize	= vattr->va_extsize;
		fa.fsx_nextents = vattr->va_nextents;
		fa.fsx_projid	= vattr->va_projid;

		if (copy_to_user(arg, &fa, sizeof(fa))) {
			error = -EFAULT;
			break;
		}
		break;
	}

	case XFS_IOC_FSSETXATTR: {
		if (copy_from_user(&fa, arg, sizeof(fa))) {
			error = -EFAULT;
			break;
		}

		attr_flags = 0;
		if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
			attr_flags |= ATTR_NONBLOCK;

		vattr->va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | XFS_AT_PROJID;
		vattr->va_xflags  = fa.fsx_xflags;
		vattr->va_extsize = fa.fsx_extsize;
		vattr->va_projid  = fa.fsx_projid;

		error = xfs_setattr(ip, vattr, attr_flags, NULL);
		if (likely(!error))
			__vn_revalidate(vp, vattr);	/* update flags */
		error = -error;
		break;
	}

	case XFS_IOC_FSGETXATTRA: {
		vattr->va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | \
				 XFS_AT_ANEXTENTS | XFS_AT_PROJID;
		error = xfs_getattr(ip, vattr, 0);
		if (unlikely(error)) {
			error = -error;
			break;
		}

		fa.fsx_xflags	= vattr->va_xflags;
		fa.fsx_extsize	= vattr->va_extsize;
		fa.fsx_nextents = vattr->va_anextents;
		fa.fsx_projid	= vattr->va_projid;

		if (copy_to_user(arg, &fa, sizeof(fa))) {
			error = -EFAULT;
			break;
		}
		break;
	}

	case XFS_IOC_GETXFLAGS: {
		flags = xfs_di2lxflags(ip->i_d.di_flags);
		if (copy_to_user(arg, &flags, sizeof(flags)))
			error = -EFAULT;
		break;
	}

	case XFS_IOC_SETXFLAGS: {
		if (copy_from_user(&flags, arg, sizeof(flags))) {
			error = -EFAULT;
			break;
		}

		if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
			      FS_NOATIME_FL | FS_NODUMP_FL | \
			      FS_SYNC_FL)) {
			error = -EOPNOTSUPP;
			break;
		}

		attr_flags = 0;
		if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
			attr_flags |= ATTR_NONBLOCK;

		vattr->va_mask = XFS_AT_XFLAGS;
		vattr->va_xflags = xfs_merge_ioc_xflags(flags,
							xfs_ip2xflags(ip));

		error = xfs_setattr(ip, vattr, attr_flags, NULL);
		if (likely(!error))
			__vn_revalidate(vp, vattr);	/* update flags */
		error = -error;
		break;
	}

	default:
		error = -ENOTTY;
		break;
	}

	kfree(vattr);
	return error;
}

STATIC int
xfs_ioc_getbmap(
	struct xfs_inode	*ip,
	int			ioflags,
	unsigned int		cmd,
	void			__user *arg)
{
	struct getbmap		bm;
	int			iflags;
	int			error;

	if (copy_from_user(&bm, arg, sizeof(bm)))
		return -XFS_ERROR(EFAULT);

	if (bm.bmv_count < 2)
		return -XFS_ERROR(EINVAL);

	iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
	if (ioflags & IO_INVIS)
		iflags |= BMV_IF_NO_DMAPI_READ;

	error = xfs_getbmap(ip, &bm, (struct getbmap __user *)arg+1, iflags);
	if (error)
		return -error;

	if (copy_to_user(arg, &bm, sizeof(bm)))
		return -XFS_ERROR(EFAULT);
	return 0;
}

STATIC int
xfs_ioc_getbmapx(
	struct xfs_inode	*ip,
	void			__user *arg)
{
	struct getbmapx		bmx;
	struct getbmap		bm;
	int			iflags;
	int			error;

	if (copy_from_user(&bmx, arg, sizeof(bmx)))
		return -XFS_ERROR(EFAULT);

	if (bmx.bmv_count < 2)
		return -XFS_ERROR(EINVAL);

	/*
	 * Map input getbmapx structure to a getbmap
	 * structure for xfs_getbmap.
	 */
	GETBMAP_CONVERT(bmx, bm);

	iflags = bmx.bmv_iflags;

	if (iflags & (~BMV_IF_VALID))
		return -XFS_ERROR(EINVAL);

	iflags |= BMV_IF_EXTENDED;

	error = xfs_getbmap(ip, &bm, (struct getbmapx __user *)arg+1, iflags);
	if (error)
		return -error;

	GETBMAP_CONVERT(bm, bmx);

	if (copy_to_user(arg, &bmx, sizeof(bmx)))
		return -XFS_ERROR(EFAULT);

	return 0;
}