1 files changed, 0 insertions, 694 deletions

diff --git a/fs/aufs/mvdown.c b/fs/aufs/mvdown.c
deleted file mode 100644
index 25e3a80b9..000000000
--- a/fs/aufs/mvdown.c
+++ /dev/null
@@ -1,694 +0,0 @@
-/*
- * Copyright (C) 2011-2015 Junjiro R. Okajima
- *
- * This program, aufs 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * move-down, opposite of copy-up
- */
-
-#include "aufs.h"
-
-struct au_mvd_args {
-	struct {
-		struct super_block *h_sb;
-		struct dentry *h_parent;
-		struct au_hinode *hdir;
-		struct inode *h_dir, *h_inode;
-		struct au_pin pin;
-	} info[AUFS_MVDOWN_NARRAY];
-
-	struct aufs_mvdown mvdown;
-	struct dentry *dentry, *parent;
-	struct inode *inode, *dir;
-	struct super_block *sb;
-	aufs_bindex_t bopq, bwh, bfound;
-	unsigned char rename_lock;
-};
-
-#define mvd_errno		mvdown.au_errno
-#define mvd_bsrc		mvdown.stbr[AUFS_MVDOWN_UPPER].bindex
-#define mvd_src_brid		mvdown.stbr[AUFS_MVDOWN_UPPER].brid
-#define mvd_bdst		mvdown.stbr[AUFS_MVDOWN_LOWER].bindex
-#define mvd_dst_brid		mvdown.stbr[AUFS_MVDOWN_LOWER].brid
-
-#define mvd_h_src_sb		info[AUFS_MVDOWN_UPPER].h_sb
-#define mvd_h_src_parent	info[AUFS_MVDOWN_UPPER].h_parent
-#define mvd_hdir_src		info[AUFS_MVDOWN_UPPER].hdir
-#define mvd_h_src_dir		info[AUFS_MVDOWN_UPPER].h_dir
-#define mvd_h_src_inode		info[AUFS_MVDOWN_UPPER].h_inode
-#define mvd_pin_src		info[AUFS_MVDOWN_UPPER].pin
-
-#define mvd_h_dst_sb		info[AUFS_MVDOWN_LOWER].h_sb
-#define mvd_h_dst_parent	info[AUFS_MVDOWN_LOWER].h_parent
-#define mvd_hdir_dst		info[AUFS_MVDOWN_LOWER].hdir
-#define mvd_h_dst_dir		info[AUFS_MVDOWN_LOWER].h_dir
-#define mvd_h_dst_inode		info[AUFS_MVDOWN_LOWER].h_inode
-#define mvd_pin_dst		info[AUFS_MVDOWN_LOWER].pin
-
-#define AU_MVD_PR(flag, ...) do {			\
-		if (flag)				\
-			pr_err(__VA_ARGS__);		\
-	} while (0)
-
-static int find_lower_writable(struct au_mvd_args *a)
-{
-	struct super_block *sb;
-	aufs_bindex_t bindex, bend;
-	struct au_branch *br;
-
-	sb = a->sb;
-	bindex = a->mvd_bsrc;
-	bend = au_sbend(sb);
-	if (a->mvdown.flags & AUFS_MVDOWN_FHSM_LOWER)
-		for (bindex++; bindex <= bend; bindex++) {
-			br = au_sbr(sb, bindex);
-			if (au_br_fhsm(br->br_perm)
-			    && (!(au_br_sb(br)->s_flags & MS_RDONLY)))
-				return bindex;
-		}
-	else if (!(a->mvdown.flags & AUFS_MVDOWN_ROLOWER))
-		for (bindex++; bindex <= bend; bindex++) {
-			br = au_sbr(sb, bindex);
-			if (!au_br_rdonly(br))
-				return bindex;
-		}
-	else
-		for (bindex++; bindex <= bend; bindex++) {
-			br = au_sbr(sb, bindex);
-			if (!(au_br_sb(br)->s_flags & MS_RDONLY)) {
-				if (au_br_rdonly(br))
-					a->mvdown.flags
-						|= AUFS_MVDOWN_ROLOWER_R;
-				return bindex;
-			}
-		}
-
-	return -1;
-}
-
-/* make the parent dir on bdst */
-static int au_do_mkdir(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-
-	err = 0;
-	a->mvd_hdir_src = au_hi(a->dir, a->mvd_bsrc);
-	a->mvd_hdir_dst = au_hi(a->dir, a->mvd_bdst);
-	a->mvd_h_src_parent = au_h_dptr(a->parent, a->mvd_bsrc);
-	a->mvd_h_dst_parent = NULL;
-	if (au_dbend(a->parent) >= a->mvd_bdst)
-		a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
-	if (!a->mvd_h_dst_parent) {
-		err = au_cpdown_dirs(a->dentry, a->mvd_bdst);
-		if (unlikely(err)) {
-			AU_MVD_PR(dmsg, "cpdown_dirs failed\n");
-			goto out;
-		}
-		a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
-	}
-
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-/* lock them all */
-static int au_do_lock(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-	struct dentry *h_trap;
-
-	a->mvd_h_src_sb = au_sbr_sb(a->sb, a->mvd_bsrc);
-	a->mvd_h_dst_sb = au_sbr_sb(a->sb, a->mvd_bdst);
-	err = au_pin(&a->mvd_pin_dst, a->dentry, a->mvd_bdst,
-		     au_opt_udba(a->sb),
-		     AuPin_MNT_WRITE | AuPin_DI_LOCKED);
-	AuTraceErr(err);
-	if (unlikely(err)) {
-		AU_MVD_PR(dmsg, "pin_dst failed\n");
-		goto out;
-	}
-
-	if (a->mvd_h_src_sb != a->mvd_h_dst_sb) {
-		a->rename_lock = 0;
-		au_pin_init(&a->mvd_pin_src, a->dentry, a->mvd_bsrc,
-			    AuLsc_DI_PARENT, AuLsc_I_PARENT3,
-			    au_opt_udba(a->sb),
-			    AuPin_MNT_WRITE | AuPin_DI_LOCKED);
-		err = au_do_pin(&a->mvd_pin_src);
-		AuTraceErr(err);
-		a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent);
-		if (unlikely(err)) {
-			AU_MVD_PR(dmsg, "pin_src failed\n");
-			goto out_dst;
-		}
-		goto out; /* success */
-	}
-
-	a->rename_lock = 1;
-	au_pin_hdir_unlock(&a->mvd_pin_dst);
-	err = au_pin(&a->mvd_pin_src, a->dentry, a->mvd_bsrc,
-		     au_opt_udba(a->sb),
-		     AuPin_MNT_WRITE | AuPin_DI_LOCKED);
-	AuTraceErr(err);
-	a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent);
-	if (unlikely(err)) {
-		AU_MVD_PR(dmsg, "pin_src failed\n");
-		au_pin_hdir_lock(&a->mvd_pin_dst);
-		goto out_dst;
-	}
-	au_pin_hdir_unlock(&a->mvd_pin_src);
-	h_trap = vfsub_lock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
-				   a->mvd_h_dst_parent, a->mvd_hdir_dst);
-	if (h_trap) {
-		err = (h_trap != a->mvd_h_src_parent);
-		if (err)
-			err = (h_trap != a->mvd_h_dst_parent);
-	}
-	BUG_ON(err); /* it should never happen */
-	if (unlikely(a->mvd_h_src_dir != au_pinned_h_dir(&a->mvd_pin_src))) {
-		err = -EBUSY;
-		AuTraceErr(err);
-		vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
-				    a->mvd_h_dst_parent, a->mvd_hdir_dst);
-		au_pin_hdir_lock(&a->mvd_pin_src);
-		au_unpin(&a->mvd_pin_src);
-		au_pin_hdir_lock(&a->mvd_pin_dst);
-		goto out_dst;
-	}
-	goto out; /* success */
-
-out_dst:
-	au_unpin(&a->mvd_pin_dst);
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-static void au_do_unlock(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	if (!a->rename_lock)
-		au_unpin(&a->mvd_pin_src);
-	else {
-		vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
-				    a->mvd_h_dst_parent, a->mvd_hdir_dst);
-		au_pin_hdir_lock(&a->mvd_pin_src);
-		au_unpin(&a->mvd_pin_src);
-		au_pin_hdir_lock(&a->mvd_pin_dst);
-	}
-	au_unpin(&a->mvd_pin_dst);
-}
-
-/* copy-down the file */
-static int au_do_cpdown(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-	struct au_cp_generic cpg = {
-		.dentry	= a->dentry,
-		.bdst	= a->mvd_bdst,
-		.bsrc	= a->mvd_bsrc,
-		.len	= -1,
-		.pin	= &a->mvd_pin_dst,
-		.flags	= AuCpup_DTIME | AuCpup_HOPEN
-	};
-
-	AuDbg("b%d, b%d\n", cpg.bsrc, cpg.bdst);
-	if (a->mvdown.flags & AUFS_MVDOWN_OWLOWER)
-		au_fset_cpup(cpg.flags, OVERWRITE);
-	if (a->mvdown.flags & AUFS_MVDOWN_ROLOWER)
-		au_fset_cpup(cpg.flags, RWDST);
-	err = au_sio_cpdown_simple(&cpg);
-	if (unlikely(err))
-		AU_MVD_PR(dmsg, "cpdown failed\n");
-
-	AuTraceErr(err);
-	return err;
-}
-
-/*
- * unlink the whiteout on bdst if exist which may be created by UDBA while we
- * were sleeping
- */
-static int au_do_unlink_wh(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-	struct path h_path;
-	struct au_branch *br;
-	struct inode *delegated;
-
-	br = au_sbr(a->sb, a->mvd_bdst);
-	h_path.dentry = au_wh_lkup(a->mvd_h_dst_parent, &a->dentry->d_name, br);
-	err = PTR_ERR(h_path.dentry);
-	if (IS_ERR(h_path.dentry)) {
-		AU_MVD_PR(dmsg, "wh_lkup failed\n");
-		goto out;
-	}
-
-	err = 0;
-	if (d_is_positive(h_path.dentry)) {
-		h_path.mnt = au_br_mnt(br);
-		delegated = NULL;
-		err = vfsub_unlink(d_inode(a->mvd_h_dst_parent), &h_path,
-				   &delegated, /*force*/0);
-		if (unlikely(err == -EWOULDBLOCK)) {
-			pr_warn("cannot retry for NFSv4 delegation"
-				" for an internal unlink\n");
-			iput(delegated);
-		}
-		if (unlikely(err))
-			AU_MVD_PR(dmsg, "wh_unlink failed\n");
-	}
-	dput(h_path.dentry);
-
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-/*
- * unlink the topmost h_dentry
- */
-static int au_do_unlink(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-	struct path h_path;
-	struct inode *delegated;
-
-	h_path.mnt = au_sbr_mnt(a->sb, a->mvd_bsrc);
-	h_path.dentry = au_h_dptr(a->dentry, a->mvd_bsrc);
-	delegated = NULL;
-	err = vfsub_unlink(a->mvd_h_src_dir, &h_path, &delegated, /*force*/0);
-	if (unlikely(err == -EWOULDBLOCK)) {
-		pr_warn("cannot retry for NFSv4 delegation"
-			" for an internal unlink\n");
-		iput(delegated);
-	}
-	if (unlikely(err))
-		AU_MVD_PR(dmsg, "unlink failed\n");
-
-	AuTraceErr(err);
-	return err;
-}
-
-/* Since mvdown succeeded, we ignore an error of this function */
-static void au_do_stfs(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-	struct au_branch *br;
-
-	a->mvdown.flags |= AUFS_MVDOWN_STFS_FAILED;
-	br = au_sbr(a->sb, a->mvd_bsrc);
-	err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_UPPER].stfs);
-	if (!err) {
-		br = au_sbr(a->sb, a->mvd_bdst);
-		a->mvdown.stbr[AUFS_MVDOWN_LOWER].brid = br->br_id;
-		err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_LOWER].stfs);
-	}
-	if (!err)
-		a->mvdown.flags &= ~AUFS_MVDOWN_STFS_FAILED;
-	else
-		AU_MVD_PR(dmsg, "statfs failed (%d), ignored\n", err);
-}
-
-/*
- * copy-down the file and unlink the bsrc file.
- * - unlink the bdst whout if exist
- * - copy-down the file (with whtmp name and rename)
- * - unlink the bsrc file
- */
-static int au_do_mvdown(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-
-	err = au_do_mkdir(dmsg, a);
-	if (!err)
-		err = au_do_lock(dmsg, a);
-	if (unlikely(err))
-		goto out;
-
-	/*
-	 * do not revert the activities we made on bdst since they should be
-	 * harmless in aufs.
-	 */
-
-	err = au_do_cpdown(dmsg, a);
-	if (!err)
-		err = au_do_unlink_wh(dmsg, a);
-	if (!err && !(a->mvdown.flags & AUFS_MVDOWN_KUPPER))
-		err = au_do_unlink(dmsg, a);
-	if (unlikely(err))
-		goto out_unlock;
-
-	AuDbg("%pd2, 0x%x, %d --> %d\n",
-	      a->dentry, a->mvdown.flags, a->mvd_bsrc, a->mvd_bdst);
-	if (find_lower_writable(a) < 0)
-		a->mvdown.flags |= AUFS_MVDOWN_BOTTOM;
-
-	if (a->mvdown.flags & AUFS_MVDOWN_STFS)
-		au_do_stfs(dmsg, a);
-
-	/* maintain internal array */
-	if (!(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) {
-		au_set_h_dptr(a->dentry, a->mvd_bsrc, NULL);
-		au_set_dbstart(a->dentry, a->mvd_bdst);
-		au_set_h_iptr(a->inode, a->mvd_bsrc, NULL, /*flags*/0);
-		au_set_ibstart(a->inode, a->mvd_bdst);
-	}
-	if (au_dbend(a->dentry) < a->mvd_bdst)
-		au_set_dbend(a->dentry, a->mvd_bdst);
-	if (au_ibend(a->inode) < a->mvd_bdst)
-		au_set_ibend(a->inode, a->mvd_bdst);
-
-out_unlock:
-	au_do_unlock(dmsg, a);
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* make sure the file is idle */
-static int au_mvd_args_busy(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err, plinked;
-
-	err = 0;
-	plinked = !!au_opt_test(au_mntflags(a->sb), PLINK);
-	if (au_dbstart(a->dentry) == a->mvd_bsrc
-	    && au_dcount(a->dentry) == 1
-	    && atomic_read(&a->inode->i_count) == 1
-	    /* && a->mvd_h_src_inode->i_nlink == 1 */
-	    && (!plinked || !au_plink_test(a->inode))
-	    && a->inode->i_nlink == 1)
-		goto out;
-
-	err = -EBUSY;
-	AU_MVD_PR(dmsg,
-		  "b%d, d{b%d, c%d?}, i{c%d?, l%u}, hi{l%u}, p{%d, %d}\n",
-		  a->mvd_bsrc, au_dbstart(a->dentry), au_dcount(a->dentry),
-		  atomic_read(&a->inode->i_count), a->inode->i_nlink,
-		  a->mvd_h_src_inode->i_nlink,
-		  plinked, plinked ? au_plink_test(a->inode) : 0);
-
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-/* make sure the parent dir is fine */
-static int au_mvd_args_parent(const unsigned char dmsg,
-			      struct au_mvd_args *a)
-{
-	int err;
-	aufs_bindex_t bindex;
-
-	err = 0;
-	if (unlikely(au_alive_dir(a->parent))) {
-		err = -ENOENT;
-		AU_MVD_PR(dmsg, "parent dir is dead\n");
-		goto out;
-	}
-
-	a->bopq = au_dbdiropq(a->parent);
-	bindex = au_wbr_nonopq(a->dentry, a->mvd_bdst);
-	AuDbg("b%d\n", bindex);
-	if (unlikely((bindex >= 0 && bindex < a->mvd_bdst)
-		     || (a->bopq != -1 && a->bopq < a->mvd_bdst))) {
-		err = -EINVAL;
-		a->mvd_errno = EAU_MVDOWN_OPAQUE;
-		AU_MVD_PR(dmsg, "ancestor is opaque b%d, b%d\n",
-			  a->bopq, a->mvd_bdst);
-	}
-
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-static int au_mvd_args_intermediate(const unsigned char dmsg,
-				    struct au_mvd_args *a)
-{
-	int err;
-	struct au_dinfo *dinfo, *tmp;
-
-	/* lookup the next lower positive entry */
-	err = -ENOMEM;
-	tmp = au_di_alloc(a->sb, AuLsc_DI_TMP);
-	if (unlikely(!tmp))
-		goto out;
-
-	a->bfound = -1;
-	a->bwh = -1;
-	dinfo = au_di(a->dentry);
-	au_di_cp(tmp, dinfo);
-	au_di_swap(tmp, dinfo);
-
-	/* returns the number of positive dentries */
-	err = au_lkup_dentry(a->dentry, a->mvd_bsrc + 1, /*type*/0);
-	if (!err)
-		a->bwh = au_dbwh(a->dentry);
-	else if (err > 0)
-		a->bfound = au_dbstart(a->dentry);
-
-	au_di_swap(tmp, dinfo);
-	au_rw_write_unlock(&tmp->di_rwsem);
-	au_di_free(tmp);
-	if (unlikely(err < 0))
-		AU_MVD_PR(dmsg, "failed look-up lower\n");
-
-	/*
-	 * here, we have these cases.
-	 * bfound == -1
-	 *	no positive dentry under bsrc. there are more sub-cases.
-	 *	bwh < 0
-	 *		there no whiteout, we can safely move-down.
-	 *	bwh <= bsrc
-	 *		impossible
-	 *	bsrc < bwh && bwh < bdst
-	 *		there is a whiteout on RO branch. cannot proceed.
-	 *	bwh == bdst
-	 *		there is a whiteout on the RW target branch. it should
-	 *		be removed.
-	 *	bdst < bwh
-	 *		there is a whiteout somewhere unrelated branch.
-	 * -1 < bfound && bfound <= bsrc
-	 *	impossible.
-	 * bfound < bdst
-	 *	found, but it is on RO branch between bsrc and bdst. cannot
-	 *	proceed.
-	 * bfound == bdst
-	 *	found, replace it if AUFS_MVDOWN_FORCE is set. otherwise return
-	 *	error.
-	 * bdst < bfound
-	 *	found, after we create the file on bdst, it will be hidden.
-	 */
-
-	AuDebugOn(a->bfound == -1
-		  && a->bwh != -1
-		  && a->bwh <= a->mvd_bsrc);
-	AuDebugOn(-1 < a->bfound
-		  && a->bfound <= a->mvd_bsrc);
-
-	err = -EINVAL;
-	if (a->bfound == -1
-	    && a->mvd_bsrc < a->bwh
-	    && a->bwh != -1
-	    && a->bwh < a->mvd_bdst) {
-		a->mvd_errno = EAU_MVDOWN_WHITEOUT;
-		AU_MVD_PR(dmsg, "bsrc %d, bdst %d, bfound %d, bwh %d\n",
-			  a->mvd_bsrc, a->mvd_bdst, a->bfound, a->bwh);
-		goto out;
-	} else if (a->bfound != -1 && a->bfound < a->mvd_bdst) {
-		a->mvd_errno = EAU_MVDOWN_UPPER;
-		AU_MVD_PR(dmsg, "bdst %d, bfound %d\n",
-			  a->mvd_bdst, a->bfound);
-		goto out;
-	}
-
-	err = 0; /* success */
-
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-static int au_mvd_args_exist(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-
-	err = 0;
-	if (!(a->mvdown.flags & AUFS_MVDOWN_OWLOWER)
-	    && a->bfound == a->mvd_bdst)
-		err = -EEXIST;
-	AuTraceErr(err);
-	return err;
-}
-
-static int au_mvd_args(const unsigned char dmsg, struct au_mvd_args *a)
-{
-	int err;
-	struct au_branch *br;
-
-	err = -EISDIR;
-	if (unlikely(S_ISDIR(a->inode->i_mode)))
-		goto out;
-
-	err = -EINVAL;
-	if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_UPPER))
-		a->mvd_bsrc = au_ibstart(a->inode);
-	else {
-		a->mvd_bsrc = au_br_index(a->sb, a->mvd_src_brid);
-		if (unlikely(a->mvd_bsrc < 0
-			     || (a->mvd_bsrc < au_dbstart(a->dentry)
-				 || au_dbend(a->dentry) < a->mvd_bsrc
-				 || !au_h_dptr(a->dentry, a->mvd_bsrc))
-			     || (a->mvd_bsrc < au_ibstart(a->inode)
-				 || au_ibend(a->inode) < a->mvd_bsrc
-				 || !au_h_iptr(a->inode, a->mvd_bsrc)))) {
-			a->mvd_errno = EAU_MVDOWN_NOUPPER;
-			AU_MVD_PR(dmsg, "no upper\n");
-			goto out;
-		}
-	}
-	if (unlikely(a->mvd_bsrc == au_sbend(a->sb))) {
-		a->mvd_errno = EAU_MVDOWN_BOTTOM;
-		AU_MVD_PR(dmsg, "on the bottom\n");
-		goto out;
-	}
-	a->mvd_h_src_inode = au_h_iptr(a->inode, a->mvd_bsrc);
-	br = au_sbr(a->sb, a->mvd_bsrc);
-	err = au_br_rdonly(br);
-	if (!(a->mvdown.flags & AUFS_MVDOWN_ROUPPER)) {
-		if (unlikely(err))
-			goto out;
-	} else if (!(vfsub_native_ro(a->mvd_h_src_inode)
-		     || IS_APPEND(a->mvd_h_src_inode))) {
-		if (err)
-			a->mvdown.flags |= AUFS_MVDOWN_ROUPPER_R;
-		/* go on */
-	} else
-		goto out;
-
-	err = -EINVAL;
-	if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_LOWER)) {
-		a->mvd_bdst = find_lower_writable(a);
-		if (unlikely(a->mvd_bdst < 0)) {
-			a->mvd_errno = EAU_MVDOWN_BOTTOM;
-			AU_MVD_PR(dmsg, "no writable lower branch\n");
-			goto out;
-		}
-	} else {
-		a->mvd_bdst = au_br_index(a->sb, a->mvd_dst_brid);
-		if (unlikely(a->mvd_bdst < 0
-			     || au_sbend(a->sb) < a->mvd_bdst)) {
-			a->mvd_errno = EAU_MVDOWN_NOLOWERBR;
-			AU_MVD_PR(dmsg, "no lower brid\n");
-			goto out;
-		}
-	}
-
-	err = au_mvd_args_busy(dmsg, a);
-	if (!err)
-		err = au_mvd_args_parent(dmsg, a);
-	if (!err)
-		err = au_mvd_args_intermediate(dmsg, a);
-	if (!err)
-		err = au_mvd_args_exist(dmsg, a);
-	if (!err)
-		AuDbg("b%d, b%d\n", a->mvd_bsrc, a->mvd_bdst);
-
-out:
-	AuTraceErr(err);
-	return err;
-}
-
-int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *uarg)
-{
-	int err, e;
-	unsigned char dmsg;
-	struct au_mvd_args *args;
-
-	err = -EPERM;
-	if (unlikely(!capable(CAP_SYS_ADMIN)))
-		goto out;
-
-	err = -ENOMEM;
-	args = kmalloc(sizeof(*args), GFP_NOFS);
-	if (unlikely(!args))
-		goto out;
-
-	err = copy_from_user(&args->mvdown, uarg, sizeof(args->mvdown));
-	if (!err)
-		err = !access_ok(VERIFY_WRITE, uarg, sizeof(*uarg));
-	if (unlikely(err)) {
-		err = -EFAULT;
-		AuTraceErr(err);
-		goto out_free;
-	}
-	AuDbg("flags 0x%x\n", args->mvdown.flags);
-	args->mvdown.flags &= ~(AUFS_MVDOWN_ROLOWER_R | AUFS_MVDOWN_ROUPPER_R);
-	args->mvdown.au_errno = 0;
-	args->dentry = dentry;
-	args->inode = d_inode(dentry);
-	args->sb = dentry->d_sb;
-
-	err = -ENOENT;
-	dmsg = !!(args->mvdown.flags & AUFS_MVDOWN_DMSG);
-	args->parent = dget_parent(dentry);
-	args->dir = d_inode(args->parent);
-	mutex_lock_nested(&args->dir->i_mutex, I_MUTEX_PARENT);
-	dput(args->parent);
-	if (unlikely(args->parent != dentry->d_parent)) {
-		AU_MVD_PR(dmsg, "parent dir is moved\n");
-		goto out_dir;
-	}
-
-	mutex_lock_nested(&args->inode->i_mutex, I_MUTEX_CHILD);
-	err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH);
-	if (unlikely(err))
-		goto out_inode;
-
-	di_write_lock_parent(args->parent);
-	err = au_mvd_args(dmsg, args);
-	if (unlikely(err))
-		goto out_parent;
-
-	err = au_do_mvdown(dmsg, args);
-	if (unlikely(err))
-		goto out_parent;
-
-	au_cpup_attr_timesizes(args->dir);
-	au_cpup_attr_timesizes(args->inode);
-	au_cpup_igen(args->inode, au_h_iptr(args->inode, args->mvd_bdst));
-	/* au_digen_dec(dentry); */
-
-out_parent:
-	di_write_unlock(args->parent);
-	aufs_read_unlock(dentry, AuLock_DW);
-out_inode:
-	mutex_unlock(&args->inode->i_mutex);
-out_dir:
-	mutex_unlock(&args->dir->i_mutex);
-out_free:
-	e = copy_to_user(uarg, &args->mvdown, sizeof(args->mvdown));
-	if (unlikely(e))
-		err = -EFAULT;
-	kfree(args);
-out:
-	AuTraceErr(err);
-	return err;
-}