patch-2.4.27 linux-2.4.27/fs/xfs/linux-2.4/xfs_ioctl.c

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diff -urN linux-2.4.26/fs/xfs/linux-2.4/xfs_ioctl.c linux-2.4.27/fs/xfs/linux-2.4/xfs_ioctl.c
@@ -0,0 +1,1247 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+
+#include "xfs_fs.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_alloc.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_bit.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_rw.h"
+#include "xfs_acl.h"
+#include "xfs_cap.h"
+#include "xfs_mac.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_utils.h"
+#include "xfs_dfrag.h"
+#include "xfs_fsops.h"
+
+#include <linux/dcache.h>
+#include <linux/iobuf.h>
+
+/*
+ * ioctl commands that are used by Linux filesystems
+ */
+#define XFS_IOC_GETXFLAGS	_IOR('f', 1, long)
+#define XFS_IOC_SETXFLAGS	_IOW('f', 2, long)
+#define XFS_IOC_GETVERSION	_IOR('v', 1, long)
+
+
+/*
+ * 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,
+	unsigned long		arg)
+{
+	int			hsize;
+	xfs_handle_t		handle;
+	xfs_fsop_handlereq_t	hreq;
+	struct inode		*inode;
+	struct vnode		*vp;
+
+	if (copy_from_user(&hreq, (xfs_fsop_handlereq_t *)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(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_dentry);
+		ASSERT(file->f_dentry->d_inode);
+		inode = igrab(file->f_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);
+	}
+
+	/* we need the vnode */
+	vp = LINVFS_GET_VP(inode);
+	if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) {
+		iput(inode);
+		return -XFS_ERROR(EBADF);
+	}
+
+	/* now we can grab the fsid */
+	memcpy(&handle.ha_fsid, vp->v_vfsp->vfs_altfsid, sizeof(xfs_fsid_t));
+	hsize = sizeof(xfs_fsid_t);
+
+	if (cmd != XFS_IOC_PATH_TO_FSHANDLE) {
+		xfs_inode_t	*ip;
+		bhv_desc_t	*bhv;
+		int		lock_mode;
+
+		/* need to get access to the xfs_inode to read the generation */
+		bhv = vn_bhv_lookup_unlocked(VN_BHV_HEAD(vp), &xfs_vnodeops);
+		ASSERT(bhv);
+		ip = XFS_BHVTOI(bhv);
+		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((xfs_handle_t *)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    */
+	int			cap,		/* capability level for op */
+	unsigned long		arg,		/* userspace data pointer  */
+	unsigned long		size,		/* size of expected struct */
+	/* output arguments */
+	xfs_fsop_handlereq_t	*hreq,
+	vnode_t			**vp,
+	struct inode		**inode)
+{
+	void			*hanp;
+	size_t			hlen;
+	xfs_fid_t		*xfid;
+	xfs_handle_t		*handlep;
+	xfs_handle_t		handle;
+	xfs_inode_t		*ip;
+	struct inode		*inodep;
+	vnode_t			*vpp;
+	xfs_ino_t		ino;
+	__u32			igen;
+	int			error;
+
+	if (!capable(cap))
+		return XFS_ERROR(EPERM);
+
+	/*
+	 * Only allow handle opens under a directory.
+	 */
+	if (!S_ISDIR(parinode->i_mode))
+		return XFS_ERROR(ENOTDIR);
+
+	/*
+	 * Copy the handle down from the user and validate
+	 * that it looks to be in the correct format.
+	 */
+	if (copy_from_user(hreq, (struct xfs_fsop_handlereq *)arg, size))
+		return XFS_ERROR(EFAULT);
+
+	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, 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 = LINVFS_GET_IP(vpp);
+	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+
+	*vp = vpp;
+	*inode = inodep;
+	return 0;
+}
+
+STATIC int
+xfs_open_by_handle(
+	xfs_mount_t		*mp,
+	unsigned long		arg,
+	struct file		*parfilp,
+	struct inode		*parinode)
+{
+	int			error;
+	int			new_fd;
+	int			permflag;
+	struct file		*filp;
+	struct inode		*inode;
+	struct dentry		*dentry;
+	vnode_t			*vp;
+	xfs_fsop_handlereq_t	hreq;
+
+	error = xfs_vget_fsop_handlereq(mp, parinode, CAP_SYS_ADMIN, arg,
+					sizeof(xfs_fsop_handlereq_t),
+					&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_vfsmnt);
+
+	/* Create file pointer. */
+	filp = dentry_open(dentry, parfilp->f_vfsmnt, hreq.oflags);
+	if (IS_ERR(filp)) {
+		put_unused_fd(new_fd);
+		return -XFS_ERROR(-PTR_ERR(filp));
+	}
+	if (inode->i_mode & S_IFREG)
+		filp->f_op = &linvfs_invis_file_operations;
+
+	fd_install(new_fd, filp);
+	return new_fd;
+}
+
+STATIC int
+xfs_readlink_by_handle(
+	xfs_mount_t		*mp,
+	unsigned long		arg,
+	struct file		*parfilp,
+	struct inode		*parinode)
+{
+	int			error;
+	struct iovec		aiov;
+	struct uio		auio;
+	struct inode		*inode;
+	xfs_fsop_handlereq_t	hreq;
+	vnode_t			*vp;
+	__u32			olen;
+
+	error = xfs_vget_fsop_handlereq(mp, parinode, CAP_SYS_ADMIN, arg,
+					sizeof(xfs_fsop_handlereq_t),
+					&hreq, &vp, &inode);
+	if (error)
+		return -error;
+
+	/* Restrict this handle operation to symlinks only. */
+	if (vp->v_type != VLNK) {
+		VN_RELE(vp);
+		return -XFS_ERROR(EINVAL);
+	}
+
+	if (copy_from_user(&olen, hreq.ohandlen, sizeof(__u32))) {
+		VN_RELE(vp);
+		return -XFS_ERROR(EFAULT);
+	}
+	aiov.iov_len	= olen;
+	aiov.iov_base	= hreq.ohandle;
+
+	auio.uio_iov	= &aiov;
+	auio.uio_iovcnt	= 1;
+	auio.uio_offset	= 0;
+	auio.uio_segflg	= UIO_USERSPACE;
+	auio.uio_resid	= olen;
+
+	VOP_READLINK(vp, &auio, IO_INVIS, NULL, error);
+
+	VN_RELE(vp);
+	return (olen - auio.uio_resid);
+}
+
+STATIC int
+xfs_fssetdm_by_handle(
+	xfs_mount_t		*mp,
+	unsigned long		arg,
+	struct file		*parfilp,
+	struct inode		*parinode)
+{
+	int			error;
+	struct fsdmidata	fsd;
+	xfs_fsop_setdm_handlereq_t dmhreq;
+	struct inode		*inode;
+	bhv_desc_t		*bdp;
+	vnode_t			*vp;
+
+	error = xfs_vget_fsop_handlereq(mp, parinode, CAP_MKNOD, arg,
+					sizeof(xfs_fsop_setdm_handlereq_t),
+					(xfs_fsop_handlereq_t *)&dmhreq,
+					&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);
+	}
+
+	bdp = bhv_base_unlocked(VN_BHV_HEAD(vp));
+	error = xfs_set_dmattrs(bdp, fsd.fsd_dmevmask, fsd.fsd_dmstate, NULL);
+
+	VN_RELE(vp);
+	if (error)
+		return -error;
+	return 0;
+}
+
+STATIC int
+xfs_attrlist_by_handle(
+	xfs_mount_t		*mp,
+	unsigned long		arg,
+	struct file		*parfilp,
+	struct inode		*parinode)
+{
+	int			error;
+	attrlist_cursor_kern_t	*cursor;
+	xfs_fsop_attrlist_handlereq_t al_hreq;
+	struct inode		*inode;
+	vnode_t			*vp;
+
+	error = xfs_vget_fsop_handlereq(mp, parinode, CAP_SYS_ADMIN, arg,
+					sizeof(xfs_fsop_attrlist_handlereq_t),
+					(xfs_fsop_handlereq_t *)&al_hreq,
+					&vp, &inode);
+	if (error)
+		return -error;
+
+	cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
+	VOP_ATTR_LIST(vp, al_hreq.buffer, al_hreq.buflen, al_hreq.flags,
+			cursor, NULL, error);
+	VN_RELE(vp);
+	if (error)
+		return -error;
+	return 0;
+}
+
+STATIC int
+xfs_attrmulti_by_handle(
+	xfs_mount_t		*mp,
+	unsigned long		arg,
+	struct file		*parfilp,
+	struct inode		*parinode)
+{
+	int			error;
+	xfs_attr_multiop_t	*ops;
+	xfs_fsop_attrmulti_handlereq_t am_hreq;
+	struct inode		*inode;
+	vnode_t			*vp;
+	int			i, size;
+
+	error = xfs_vget_fsop_handlereq(mp, parinode, CAP_SYS_ADMIN, arg,
+					sizeof(xfs_fsop_attrmulti_handlereq_t),
+					(xfs_fsop_handlereq_t *)&am_hreq,
+					&vp, &inode);
+	if (error)
+		return -error;
+
+	size = am_hreq.opcount * sizeof(attr_multiop_t);
+	ops = (xfs_attr_multiop_t *)kmalloc(size, GFP_KERNEL);
+	if (!ops) {
+		VN_RELE(vp);
+		return -XFS_ERROR(ENOMEM);
+	}
+
+	if (copy_from_user(ops, am_hreq.ops, size)) {
+		kfree(ops);
+		VN_RELE(vp);
+		return -XFS_ERROR(EFAULT);
+	}
+
+	for (i = 0; i < am_hreq.opcount; i++) {
+		switch(ops[i].am_opcode) {
+		case ATTR_OP_GET:
+			VOP_ATTR_GET(vp,ops[i].am_attrname, ops[i].am_attrvalue,
+					&ops[i].am_length, ops[i].am_flags,
+					NULL, ops[i].am_error);
+			break;
+		case ATTR_OP_SET:
+			if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
+				ops[i].am_error = EPERM;
+				break;
+			}
+			VOP_ATTR_SET(vp,ops[i].am_attrname, ops[i].am_attrvalue,
+					ops[i].am_length, ops[i].am_flags,
+					NULL, ops[i].am_error);
+			break;
+		case ATTR_OP_REMOVE:
+			if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) {
+				ops[i].am_error = EPERM;
+				break;
+			}
+			VOP_ATTR_REMOVE(vp, ops[i].am_attrname, ops[i].am_flags,
+					NULL, ops[i].am_error);
+			break;
+		default:
+			ops[i].am_error = EINVAL;
+		}
+	}
+
+	if (copy_to_user(am_hreq.ops, ops, size))
+		error = -XFS_ERROR(EFAULT);
+
+	kfree(ops);
+	VN_RELE(vp);
+	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(
+	bhv_desc_t		*bdp,
+	vnode_t			*vp,
+	struct file		*filp,
+	int			flags,
+	unsigned int		cmd,
+	unsigned long		arg);
+
+STATIC int
+xfs_ioc_bulkstat(
+	xfs_mount_t		*mp,
+	unsigned int		cmd,
+	unsigned long		arg);
+
+STATIC int
+xfs_ioc_fsgeometry_v1(
+	xfs_mount_t		*mp,
+	unsigned long		arg);
+
+STATIC int
+xfs_ioc_fsgeometry(
+	xfs_mount_t		*mp,
+	unsigned long		arg);
+
+STATIC int
+xfs_ioc_xattr(
+	vnode_t			*vp,
+	xfs_inode_t		*ip,
+	struct file		*filp,
+	unsigned int		cmd,
+	unsigned long		arg);
+
+STATIC int
+xfs_ioc_getbmap(
+	bhv_desc_t		*bdp,
+	struct file		*filp,
+	int			flags,
+	unsigned int		cmd,
+	unsigned long		arg);
+
+STATIC int
+xfs_ioc_getbmapx(
+	bhv_desc_t		*bdp,
+	unsigned long		arg);
+
+int
+xfs_ioctl(
+	bhv_desc_t		*bdp,
+	struct inode		*inode,
+	struct file		*filp,
+	int			ioflags,
+	unsigned int		cmd,
+	unsigned long		arg)
+{
+	int			error;
+	vnode_t			*vp;
+	xfs_inode_t		*ip;
+	xfs_mount_t		*mp;
+
+	vp = LINVFS_GET_VP(inode);
+
+	vn_trace_entry(vp, "xfs_ioctl", (inst_t *)__return_address);
+
+	ip = XFS_BHVTOI(bdp);
+	mp = ip->i_mount;
+
+	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(bdp, vp, filp, ioflags, cmd, arg);
+
+	case XFS_IOC_DIOINFO: {
+		struct dioattr	da;
+
+		da.d_miniosz = mp->m_sb.sb_blocksize;
+		da.d_mem = mp->m_sb.sb_blocksize;
+
+		/*
+		 * this only really needs to be BBSIZE.
+		 * it is set to the file system block size to
+		 * avoid having to do block zeroing on short writes.
+		 */
+		da.d_maxiosz = XFS_FSB_TO_B(mp,
+				XFS_B_TO_FSBT(mp, KIO_MAX_ATOMIC_IO << 10));
+
+		if (copy_to_user((struct dioattr *)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:
+	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, (struct fsdmidata *)arg, sizeof(dmi)))
+			return -XFS_ERROR(EFAULT);
+
+		error = xfs_set_dmattrs(bdp, dmi.fsd_dmevmask, dmi.fsd_dmstate,
+							NULL);
+		return -error;
+	}
+
+	case XFS_IOC_GETBMAP:
+	case XFS_IOC_GETBMAPA:
+		return xfs_ioc_getbmap(bdp, filp, ioflags, cmd, arg);
+
+	case XFS_IOC_GETBMAPX:
+		return xfs_ioc_getbmapx(bdp, 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, filp, inode);
+
+	case XFS_IOC_READLINK_BY_HANDLE:
+		return xfs_readlink_by_handle(mp, arg, filp, inode);
+
+	case XFS_IOC_ATTRLIST_BY_HANDLE:
+		return xfs_attrlist_by_handle(mp, arg, filp, inode);
+
+	case XFS_IOC_ATTRMULTI_BY_HANDLE:
+		return xfs_attrmulti_by_handle(mp, arg, filp, inode);
+
+	case XFS_IOC_SWAPEXT: {
+		error = xfs_swapext((struct xfs_swapext *)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((char *)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, (char *)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((char *)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((char *)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, (char *)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, (char *)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, (char *)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;
+		xfs_fs_freeze(mp);
+		return 0;
+
+	case XFS_IOC_THAW:
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+		xfs_fs_thaw(mp);
+		return 0;
+
+	case XFS_IOC_GOINGDOWN: {
+		__uint32_t in;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		if (get_user(in, (__uint32_t *)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, (char *)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(
+	bhv_desc_t		*bdp,
+	vnode_t			*vp,
+	struct file		*filp,
+	int			ioflags,
+	unsigned int		cmd,
+	unsigned long		arg)
+{
+	xfs_flock64_t		bf;
+	int			attr_flags = 0;
+	int			error;
+
+	if (vp->v_inode.i_flags & (S_IMMUTABLE|S_APPEND))
+		return -XFS_ERROR(EPERM);
+
+	if (!(filp->f_flags & FMODE_WRITE))
+		return -XFS_ERROR(EBADF);
+
+	if (vp->v_type != VREG)
+		return -XFS_ERROR(EINVAL);
+
+	if (copy_from_user(&bf, (xfs_flock64_t *)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(bdp, cmd, &bf, filp->f_pos,
+					      NULL, attr_flags);
+	return -error;
+}
+
+STATIC int
+xfs_ioc_bulkstat(
+	xfs_mount_t		*mp,
+	unsigned int		cmd,
+	unsigned long		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, (xfs_fsop_bulkreq_t *)arg,
+					sizeof(xfs_fsop_bulkreq_t)))
+		return -XFS_ERROR(EFAULT);
+
+	if (copy_from_user(&inlast, (__s64 *)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);
+	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((xfs_ino_t *)bulkreq.lastip, &inlast,
+						sizeof(xfs_ino_t)))
+			return -XFS_ERROR(EFAULT);
+
+		if (copy_to_user((__s32 *)bulkreq.ocount, &count,
+						sizeof(count)))
+			return -XFS_ERROR(EFAULT);
+	}
+
+	return 0;
+}
+
+STATIC int
+xfs_ioc_fsgeometry_v1(
+	xfs_mount_t		*mp,
+	unsigned long		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((xfs_fsop_geom_t *)arg, &fsgeo, sizeof(fsgeo)))
+		return -XFS_ERROR(EFAULT);
+	return 0;
+}
+
+STATIC int
+xfs_ioc_fsgeometry(
+	xfs_mount_t		*mp,
+	unsigned long		arg)
+{
+	xfs_fsop_geom_t		fsgeo;
+	int			error;
+
+	error = xfs_fs_geometry(mp, &fsgeo, 4);
+	if (error)
+		return -error;
+
+	if (copy_to_user((xfs_fsop_geom_t *)arg, &fsgeo, sizeof(fsgeo)))
+		return -XFS_ERROR(EFAULT);
+	return 0;
+}
+
+/*
+ * Linux extended inode flags interface.
+ */
+#define LINUX_XFLAG_SYNC	0x00000008 /* Synchronous updates */
+#define LINUX_XFLAG_IMMUTABLE	0x00000010 /* Immutable file */
+#define LINUX_XFLAG_APPEND	0x00000020 /* writes to file may only append */
+#define LINUX_XFLAG_NODUMP	0x00000040 /* do not dump file */
+#define LINUX_XFLAG_NOATIME	0x00000080 /* do not update atime */
+
+STATIC unsigned int
+xfs_merge_ioc_xflags(
+	unsigned int	flags,
+	unsigned int	start)
+{
+	unsigned int	xflags = start;
+
+	if (flags & LINUX_XFLAG_IMMUTABLE)
+		xflags |= XFS_XFLAG_IMMUTABLE;
+	else
+		xflags &= ~XFS_XFLAG_IMMUTABLE;
+	if (flags & LINUX_XFLAG_APPEND)
+		xflags |= XFS_XFLAG_APPEND;
+	else
+		xflags &= ~XFS_XFLAG_APPEND;
+	if (flags & LINUX_XFLAG_SYNC)
+		xflags |= XFS_XFLAG_SYNC;
+	else
+		xflags &= ~XFS_XFLAG_SYNC;
+	if (flags & LINUX_XFLAG_NOATIME)
+		xflags |= XFS_XFLAG_NOATIME;
+	else
+		xflags &= ~XFS_XFLAG_NOATIME;
+	if (flags & LINUX_XFLAG_NODUMP)
+		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 |= LINUX_XFLAG_IMMUTABLE;
+	if (di_flags & XFS_DIFLAG_APPEND)
+		flags |= LINUX_XFLAG_APPEND;
+	if (di_flags & XFS_DIFLAG_SYNC)
+		flags |= LINUX_XFLAG_SYNC;
+	if (di_flags & XFS_DIFLAG_NOATIME)
+		flags |= LINUX_XFLAG_NOATIME;
+	if (di_flags & XFS_DIFLAG_NODUMP)
+		flags |= LINUX_XFLAG_NODUMP;
+	return flags;
+}
+
+STATIC int
+xfs_ioc_xattr(
+	vnode_t			*vp,
+	xfs_inode_t		*ip,
+	struct file		*filp,
+	unsigned int		cmd,
+	unsigned long		arg)
+{
+	struct fsxattr		fa;
+	vattr_t			va;
+	int			error;
+	int			attr_flags;
+	unsigned int		flags;
+
+	switch (cmd) {
+	case XFS_IOC_FSGETXATTR: {
+		va.va_mask = XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_NEXTENTS;
+		VOP_GETATTR(vp, &va, 0, NULL, error);
+		if (error)
+			return -error;
+
+		fa.fsx_xflags	= va.va_xflags;
+		fa.fsx_extsize	= va.va_extsize;
+		fa.fsx_nextents = va.va_nextents;
+
+		if (copy_to_user((struct fsxattr *)arg, &fa, sizeof(fa)))
+			return -XFS_ERROR(EFAULT);
+		return 0;
+	}
+
+	case XFS_IOC_FSSETXATTR: {
+		if (copy_from_user(&fa, (struct fsxattr *)arg, sizeof(fa)))
+			return -XFS_ERROR(EFAULT);
+
+		attr_flags = 0;
+		if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
+			attr_flags |= ATTR_NONBLOCK;
+
+		va.va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE;
+		va.va_xflags  = fa.fsx_xflags;
+		va.va_extsize = fa.fsx_extsize;
+
+		VOP_SETATTR(vp, &va, attr_flags, NULL, error);
+		if (!error)
+			vn_revalidate(vp);	/* update Linux inode flags */
+		return -error;
+	}
+
+	case XFS_IOC_FSGETXATTRA: {
+		va.va_mask = XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_ANEXTENTS;
+		VOP_GETATTR(vp, &va, 0, NULL, error);
+		if (error)
+			return -error;
+
+		fa.fsx_xflags	= va.va_xflags;
+		fa.fsx_extsize	= va.va_extsize;
+		fa.fsx_nextents = va.va_anextents;
+
+		if (copy_to_user((struct fsxattr *)arg, &fa, sizeof(fa)))
+			return -XFS_ERROR(EFAULT);
+		return 0;
+	}
+
+	case XFS_IOC_GETXFLAGS: {
+		flags = xfs_di2lxflags(ip->i_d.di_flags);
+		if (copy_to_user((unsigned int *)arg, &flags, sizeof(flags)))
+			return -XFS_ERROR(EFAULT);
+		return 0;
+	}
+
+	case XFS_IOC_SETXFLAGS: {
+		if (copy_from_user(&flags, (unsigned int *)arg, sizeof(flags)))
+			return -XFS_ERROR(EFAULT);
+
+		if (flags & ~(LINUX_XFLAG_IMMUTABLE | LINUX_XFLAG_APPEND | \
+			      LINUX_XFLAG_NOATIME | LINUX_XFLAG_NODUMP | \
+			      LINUX_XFLAG_SYNC))
+			return -XFS_ERROR(EOPNOTSUPP);
+
+		attr_flags = 0;
+		if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
+			attr_flags |= ATTR_NONBLOCK;
+
+		va.va_mask = XFS_AT_XFLAGS;
+		va.va_xflags = xfs_merge_ioc_xflags(flags,
+				xfs_dic2xflags(&ip->i_d, ARCH_NOCONVERT));
+
+		VOP_SETATTR(vp, &va, attr_flags, NULL, error);
+		if (!error)
+			vn_revalidate(vp);	/* update Linux inode flags */
+		return -error;
+	}
+
+	case XFS_IOC_GETVERSION: {
+		flags = LINVFS_GET_IP(vp)->i_generation;
+		if (copy_to_user((unsigned int *)arg, &flags, sizeof(flags)))
+			return -XFS_ERROR(EFAULT);
+		return 0;
+	}
+
+	default:
+		return -ENOTTY;
+	}
+}
+
+STATIC int
+xfs_ioc_getbmap(
+	bhv_desc_t		*bdp,
+	struct file		*filp,
+	int			ioflags,
+	unsigned int		cmd,
+	unsigned long		arg)
+{
+	struct getbmap		bm;
+	int			iflags;
+	int			error;
+
+	if (copy_from_user(&bm, (struct getbmap *)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(bdp, &bm, (struct getbmap *)arg+1, iflags);
+	if (error)
+		return -error;
+
+	if (copy_to_user((struct getbmap *)arg, &bm, sizeof(bm)))
+		return -XFS_ERROR(EFAULT);
+	return 0;
+}
+
+STATIC int
+xfs_ioc_getbmapx(
+	bhv_desc_t		*bdp,
+	unsigned long		arg)
+{
+	struct getbmapx		bmx;
+	struct getbmap		bm;
+	int			iflags;
+	int			error;
+
+	if (copy_from_user(&bmx, (struct getbmapx *)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(bdp, &bm, (struct getbmapx *)arg+1, iflags);
+	if (error)
+		return -error;
+
+	GETBMAP_CONVERT(bm, bmx);
+
+	if (copy_to_user((struct getbmapx *)arg, &bmx, sizeof(bmx)))
+		return -XFS_ERROR(EFAULT);
+
+	return 0;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)