Linux-libre 4.2-gnu

1 files changed, 0 insertions, 1004 deletions

diff --git a/fs/aufs/super.c b/fs/aufs/super.c
deleted file mode 100644
index 6b7f38e48..000000000
--- a/fs/aufs/super.c
+++ /dev/null
@@ -1,1004 +0,0 @@
-/*
- * Copyright (C) 2005-2015 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/>.
- */
-
-/*
- * mount and super_block operations
- */
-
-#include <linux/mm.h>
-#include <linux/seq_file.h>
-#include <linux/statfs.h>
-#include <linux/vmalloc.h>
-#include "aufs.h"
-
-/*
- * super_operations
- */
-static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused)
-{
-	struct au_icntnr *c;
-
-	c = au_cache_alloc_icntnr();
-	if (c) {
-		au_icntnr_init(c);
-		c->vfs_inode.i_version = 1; /* sigen(sb); */
-		c->iinfo.ii_hinode = NULL;
-		return &c->vfs_inode;
-	}
-	return NULL;
-}
-
-static void aufs_destroy_inode_cb(struct rcu_head *head)
-{
-	struct inode *inode = container_of(head, struct inode, i_rcu);
-
-	INIT_HLIST_HEAD(&inode->i_dentry);
-	au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode));
-}
-
-static void aufs_destroy_inode(struct inode *inode)
-{
-	au_iinfo_fin(inode);
-	call_rcu(&inode->i_rcu, aufs_destroy_inode_cb);
-}
-
-struct inode *au_iget_locked(struct super_block *sb, ino_t ino)
-{
-	struct inode *inode;
-	int err;
-
-	inode = iget_locked(sb, ino);
-	if (unlikely(!inode)) {
-		inode = ERR_PTR(-ENOMEM);
-		goto out;
-	}
-	if (!(inode->i_state & I_NEW))
-		goto out;
-
-	err = au_xigen_new(inode);
-	if (!err)
-		err = au_iinfo_init(inode);
-	if (!err)
-		inode->i_version++;
-	else {
-		iget_failed(inode);
-		inode = ERR_PTR(err);
-	}
-
-out:
-	/* never return NULL */
-	AuDebugOn(!inode);
-	AuTraceErrPtr(inode);
-	return inode;
-}
-
-/* lock free root dinfo */
-static int au_show_brs(struct seq_file *seq, struct super_block *sb)
-{
-	int err;
-	aufs_bindex_t bindex, bend;
-	struct path path;
-	struct au_hdentry *hdp;
-	struct au_branch *br;
-	au_br_perm_str_t perm;
-
-	err = 0;
-	bend = au_sbend(sb);
-	hdp = au_di(sb->s_root)->di_hdentry;
-	for (bindex = 0; !err && bindex <= bend; bindex++) {
-		br = au_sbr(sb, bindex);
-		path.mnt = au_br_mnt(br);
-		path.dentry = hdp[bindex].hd_dentry;
-		err = au_seq_path(seq, &path);
-		if (err > 0) {
-			au_optstr_br_perm(&perm, br->br_perm);
-			err = seq_printf(seq, "=%s", perm.a);
-			if (err == -1)
-				err = -E2BIG;
-		}
-		if (!err && bindex != bend)
-			err = seq_putc(seq, ':');
-	}
-
-	return err;
-}
-
-static void au_show_wbr_create(struct seq_file *m, int v,
-			       struct au_sbinfo *sbinfo)
-{
-	const char *pat;
-
-	AuRwMustAnyLock(&sbinfo->si_rwsem);
-
-	seq_puts(m, ",create=");
-	pat = au_optstr_wbr_create(v);
-	switch (v) {
-	case AuWbrCreate_TDP:
-	case AuWbrCreate_RR:
-	case AuWbrCreate_MFS:
-	case AuWbrCreate_PMFS:
-		seq_puts(m, pat);
-		break;
-	case AuWbrCreate_MFSV:
-		seq_printf(m, /*pat*/"mfs:%lu",
-			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-			   / MSEC_PER_SEC);
-		break;
-	case AuWbrCreate_PMFSV:
-		seq_printf(m, /*pat*/"pmfs:%lu",
-			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-			   / MSEC_PER_SEC);
-		break;
-	case AuWbrCreate_MFSRR:
-		seq_printf(m, /*pat*/"mfsrr:%llu",
-			   sbinfo->si_wbr_mfs.mfsrr_watermark);
-		break;
-	case AuWbrCreate_MFSRRV:
-		seq_printf(m, /*pat*/"mfsrr:%llu:%lu",
-			   sbinfo->si_wbr_mfs.mfsrr_watermark,
-			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-			   / MSEC_PER_SEC);
-		break;
-	case AuWbrCreate_PMFSRR:
-		seq_printf(m, /*pat*/"pmfsrr:%llu",
-			   sbinfo->si_wbr_mfs.mfsrr_watermark);
-		break;
-	case AuWbrCreate_PMFSRRV:
-		seq_printf(m, /*pat*/"pmfsrr:%llu:%lu",
-			   sbinfo->si_wbr_mfs.mfsrr_watermark,
-			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-			   / MSEC_PER_SEC);
-		break;
-	}
-}
-
-static int au_show_xino(struct seq_file *seq, struct super_block *sb)
-{
-#ifdef CONFIG_SYSFS
-	return 0;
-#else
-	int err;
-	const int len = sizeof(AUFS_XINO_FNAME) - 1;
-	aufs_bindex_t bindex, brid;
-	struct qstr *name;
-	struct file *f;
-	struct dentry *d, *h_root;
-	struct au_hdentry *hdp;
-
-	AuRwMustAnyLock(&sbinfo->si_rwsem);
-
-	err = 0;
-	f = au_sbi(sb)->si_xib;
-	if (!f)
-		goto out;
-
-	/* stop printing the default xino path on the first writable branch */
-	h_root = NULL;
-	brid = au_xino_brid(sb);
-	if (brid >= 0) {
-		bindex = au_br_index(sb, brid);
-		hdp = au_di(sb->s_root)->di_hdentry;
-		h_root = hdp[0 + bindex].hd_dentry;
-	}
-	d = f->f_path.dentry;
-	name = &d->d_name;
-	/* safe ->d_parent because the file is unlinked */
-	if (d->d_parent == h_root
-	    && name->len == len
-	    && !memcmp(name->name, AUFS_XINO_FNAME, len))
-		goto out;
-
-	seq_puts(seq, ",xino=");
-	err = au_xino_path(seq, f);
-
-out:
-	return err;
-#endif
-}
-
-/* seq_file will re-call me in case of too long string */
-static int aufs_show_options(struct seq_file *m, struct dentry *dentry)
-{
-	int err;
-	unsigned int mnt_flags, v;
-	struct super_block *sb;
-	struct au_sbinfo *sbinfo;
-
-#define AuBool(name, str) do { \
-	v = au_opt_test(mnt_flags, name); \
-	if (v != au_opt_test(AuOpt_Def, name)) \
-		seq_printf(m, ",%s" #str, v ? "" : "no"); \
-} while (0)
-
-#define AuStr(name, str) do { \
-	v = mnt_flags & AuOptMask_##name; \
-	if (v != (AuOpt_Def & AuOptMask_##name)) \
-		seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \
-} while (0)
-
-#define AuUInt(name, str, val) do { \
-	if (val != AUFS_##name##_DEF) \
-		seq_printf(m, "," #str "=%u", val); \
-} while (0)
-
-	sb = dentry->d_sb;
-	if (sb->s_flags & MS_POSIXACL)
-		seq_puts(m, ",acl");
-
-	/* lock free root dinfo */
-	si_noflush_read_lock(sb);
-	sbinfo = au_sbi(sb);
-	seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo));
-
-	mnt_flags = au_mntflags(sb);
-	if (au_opt_test(mnt_flags, XINO)) {
-		err = au_show_xino(m, sb);
-		if (unlikely(err))
-			goto out;
-	} else
-		seq_puts(m, ",noxino");
-
-	AuBool(TRUNC_XINO, trunc_xino);
-	AuStr(UDBA, udba);
-	AuBool(SHWH, shwh);
-	AuBool(PLINK, plink);
-	AuBool(DIO, dio);
-	AuBool(DIRPERM1, dirperm1);
-
-	v = sbinfo->si_wbr_create;
-	if (v != AuWbrCreate_Def)
-		au_show_wbr_create(m, v, sbinfo);
-
-	v = sbinfo->si_wbr_copyup;
-	if (v != AuWbrCopyup_Def)
-		seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v));
-
-	v = au_opt_test(mnt_flags, ALWAYS_DIROPQ);
-	if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ))
-		seq_printf(m, ",diropq=%c", v ? 'a' : 'w');
-
-	AuUInt(DIRWH, dirwh, sbinfo->si_dirwh);
-
-	v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC;
-	AuUInt(RDCACHE, rdcache, v);
-
-	AuUInt(RDBLK, rdblk, sbinfo->si_rdblk);
-	AuUInt(RDHASH, rdhash, sbinfo->si_rdhash);
-
-	au_fhsm_show(m, sbinfo);
-
-	AuBool(SUM, sum);
-	/* AuBool(SUM_W, wsum); */
-	AuBool(WARN_PERM, warn_perm);
-	AuBool(VERBOSE, verbose);
-
-out:
-	/* be sure to print "br:" last */
-	if (!sysaufs_brs) {
-		seq_puts(m, ",br:");
-		au_show_brs(m, sb);
-	}
-	si_read_unlock(sb);
-	return 0;
-
-#undef AuBool
-#undef AuStr
-#undef AuUInt
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* sum mode which returns the summation for statfs(2) */
-
-static u64 au_add_till_max(u64 a, u64 b)
-{
-	u64 old;
-
-	old = a;
-	a += b;
-	if (old <= a)
-		return a;
-	return ULLONG_MAX;
-}
-
-static u64 au_mul_till_max(u64 a, long mul)
-{
-	u64 old;
-
-	old = a;
-	a *= mul;
-	if (old <= a)
-		return a;
-	return ULLONG_MAX;
-}
-
-static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf)
-{
-	int err;
-	long bsize, factor;
-	u64 blocks, bfree, bavail, files, ffree;
-	aufs_bindex_t bend, bindex, i;
-	unsigned char shared;
-	struct path h_path;
-	struct super_block *h_sb;
-
-	err = 0;
-	bsize = LONG_MAX;
-	files = 0;
-	ffree = 0;
-	blocks = 0;
-	bfree = 0;
-	bavail = 0;
-	bend = au_sbend(sb);
-	for (bindex = 0; bindex <= bend; bindex++) {
-		h_path.mnt = au_sbr_mnt(sb, bindex);
-		h_sb = h_path.mnt->mnt_sb;
-		shared = 0;
-		for (i = 0; !shared && i < bindex; i++)
-			shared = (au_sbr_sb(sb, i) == h_sb);
-		if (shared)
-			continue;
-
-		/* sb->s_root for NFS is unreliable */
-		h_path.dentry = h_path.mnt->mnt_root;
-		err = vfs_statfs(&h_path, buf);
-		if (unlikely(err))
-			goto out;
-
-		if (bsize > buf->f_bsize) {
-			/*
-			 * we will reduce bsize, so we have to expand blocks
-			 * etc. to match them again
-			 */
-			factor = (bsize / buf->f_bsize);
-			blocks = au_mul_till_max(blocks, factor);
-			bfree = au_mul_till_max(bfree, factor);
-			bavail = au_mul_till_max(bavail, factor);
-			bsize = buf->f_bsize;
-		}
-
-		factor = (buf->f_bsize / bsize);
-		blocks = au_add_till_max(blocks,
-				au_mul_till_max(buf->f_blocks, factor));
-		bfree = au_add_till_max(bfree,
-				au_mul_till_max(buf->f_bfree, factor));
-		bavail = au_add_till_max(bavail,
-				au_mul_till_max(buf->f_bavail, factor));
-		files = au_add_till_max(files, buf->f_files);
-		ffree = au_add_till_max(ffree, buf->f_ffree);
-	}
-
-	buf->f_bsize = bsize;
-	buf->f_blocks = blocks;
-	buf->f_bfree = bfree;
-	buf->f_bavail = bavail;
-	buf->f_files = files;
-	buf->f_ffree = ffree;
-	buf->f_frsize = 0;
-
-out:
-	return err;
-}
-
-static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
-	int err;
-	struct path h_path;
-	struct super_block *sb;
-
-	/* lock free root dinfo */
-	sb = dentry->d_sb;
-	si_noflush_read_lock(sb);
-	if (!au_opt_test(au_mntflags(sb), SUM)) {
-		/* sb->s_root for NFS is unreliable */
-		h_path.mnt = au_sbr_mnt(sb, 0);
-		h_path.dentry = h_path.mnt->mnt_root;
-		err = vfs_statfs(&h_path, buf);
-	} else
-		err = au_statfs_sum(sb, buf);
-	si_read_unlock(sb);
-
-	if (!err) {
-		buf->f_type = AUFS_SUPER_MAGIC;
-		buf->f_namelen = AUFS_MAX_NAMELEN;
-		memset(&buf->f_fsid, 0, sizeof(buf->f_fsid));
-	}
-	/* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */
-
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_sync_fs(struct super_block *sb, int wait)
-{
-	int err, e;
-	aufs_bindex_t bend, bindex;
-	struct au_branch *br;
-	struct super_block *h_sb;
-
-	err = 0;
-	si_noflush_read_lock(sb);
-	bend = au_sbend(sb);
-	for (bindex = 0; bindex <= bend; bindex++) {
-		br = au_sbr(sb, bindex);
-		if (!au_br_writable(br->br_perm))
-			continue;
-
-		h_sb = au_sbr_sb(sb, bindex);
-		if (h_sb->s_op->sync_fs) {
-			e = h_sb->s_op->sync_fs(h_sb, wait);
-			if (unlikely(e && !err))
-				err = e;
-			/* go on even if an error happens */
-		}
-	}
-	si_read_unlock(sb);
-
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* final actions when unmounting a file system */
-static void aufs_put_super(struct super_block *sb)
-{
-	struct au_sbinfo *sbinfo;
-
-	sbinfo = au_sbi(sb);
-	if (!sbinfo)
-		return;
-
-	dbgaufs_si_fin(sbinfo);
-	kobject_put(&sbinfo->si_kobj);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_array_free(void *array)
-{
-	if (array) {
-		if (!is_vmalloc_addr(array))
-			kfree(array);
-		else
-			vfree(array);
-	}
-}
-
-void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg)
-{
-	void *array;
-	unsigned long long n, sz;
-
-	array = NULL;
-	n = 0;
-	if (!*hint)
-		goto out;
-
-	if (*hint > ULLONG_MAX / sizeof(array)) {
-		array = ERR_PTR(-EMFILE);
-		pr_err("hint %llu\n", *hint);
-		goto out;
-	}
-
-	sz = sizeof(array) * *hint;
-	array = kzalloc(sz, GFP_NOFS);
-	if (unlikely(!array))
-		array = vzalloc(sz);
-	if (unlikely(!array)) {
-		array = ERR_PTR(-ENOMEM);
-		goto out;
-	}
-
-	n = cb(array, *hint, arg);
-	AuDebugOn(n > *hint);
-
-out:
-	*hint = n;
-	return array;
-}
-
-static unsigned long long au_iarray_cb(void *a,
-				       unsigned long long max __maybe_unused,
-				       void *arg)
-{
-	unsigned long long n;
-	struct inode **p, *inode;
-	struct list_head *head;
-
-	n = 0;
-	p = a;
-	head = arg;
-	spin_lock(&inode_sb_list_lock);
-	list_for_each_entry(inode, head, i_sb_list) {
-		if (!is_bad_inode(inode)
-		    && au_ii(inode)->ii_bstart >= 0) {
-			spin_lock(&inode->i_lock);
-			if (atomic_read(&inode->i_count)) {
-				au_igrab(inode);
-				*p++ = inode;
-				n++;
-				AuDebugOn(n > max);
-			}
-			spin_unlock(&inode->i_lock);
-		}
-	}
-	spin_unlock(&inode_sb_list_lock);
-
-	return n;
-}
-
-struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max)
-{
-	*max = atomic_long_read(&au_sbi(sb)->si_ninodes);
-	return au_array_alloc(max, au_iarray_cb, &sb->s_inodes);
-}
-
-void au_iarray_free(struct inode **a, unsigned long long max)
-{
-	unsigned long long ull;
-
-	for (ull = 0; ull < max; ull++)
-		iput(a[ull]);
-	au_array_free(a);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * refresh dentry and inode at remount time.
- */
-/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */
-static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags,
-		      struct dentry *parent)
-{
-	int err;
-
-	di_write_lock_child(dentry);
-	di_read_lock_parent(parent, AuLock_IR);
-	err = au_refresh_dentry(dentry, parent);
-	if (!err && dir_flags)
-		au_hn_reset(d_inode(dentry), dir_flags);
-	di_read_unlock(parent, AuLock_IR);
-	di_write_unlock(dentry);
-
-	return err;
-}
-
-static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen,
-			   struct au_sbinfo *sbinfo,
-			   const unsigned int dir_flags)
-{
-	int err;
-	struct dentry *parent;
-
-	err = 0;
-	parent = dget_parent(dentry);
-	if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) {
-		if (d_really_is_positive(dentry)) {
-			if (!d_is_dir(dentry))
-				err = au_do_refresh(dentry, /*dir_flags*/0,
-						 parent);
-			else {
-				err = au_do_refresh(dentry, dir_flags, parent);
-				if (unlikely(err))
-					au_fset_si(sbinfo, FAILED_REFRESH_DIR);
-			}
-		} else
-			err = au_do_refresh(dentry, /*dir_flags*/0, parent);
-		AuDbgDentry(dentry);
-	}
-	dput(parent);
-
-	AuTraceErr(err);
-	return err;
-}
-
-static int au_refresh_d(struct super_block *sb)
-{
-	int err, i, j, ndentry, e;
-	unsigned int sigen;
-	struct au_dcsub_pages dpages;
-	struct au_dpage *dpage;
-	struct dentry **dentries, *d;
-	struct au_sbinfo *sbinfo;
-	struct dentry *root = sb->s_root;
-	const unsigned int dir_flags = au_hi_flags(d_inode(root), /*isdir*/1);
-
-	err = au_dpages_init(&dpages, GFP_NOFS);
-	if (unlikely(err))
-		goto out;
-	err = au_dcsub_pages(&dpages, root, NULL, NULL);
-	if (unlikely(err))
-		goto out_dpages;
-
-	sigen = au_sigen(sb);
-	sbinfo = au_sbi(sb);
-	for (i = 0; i < dpages.ndpage; i++) {
-		dpage = dpages.dpages + i;
-		dentries = dpage->dentries;
-		ndentry = dpage->ndentry;
-		for (j = 0; j < ndentry; j++) {
-			d = dentries[j];
-			e = au_do_refresh_d(d, sigen, sbinfo, dir_flags);
-			if (unlikely(e && !err))
-				err = e;
-			/* go on even err */
-		}
-	}
-
-out_dpages:
-	au_dpages_free(&dpages);
-out:
-	return err;
-}
-
-static int au_refresh_i(struct super_block *sb)
-{
-	int err, e;
-	unsigned int sigen;
-	unsigned long long max, ull;
-	struct inode *inode, **array;
-
-	array = au_iarray_alloc(sb, &max);
-	err = PTR_ERR(array);
-	if (IS_ERR(array))
-		goto out;
-
-	err = 0;
-	sigen = au_sigen(sb);
-	for (ull = 0; ull < max; ull++) {
-		inode = array[ull];
-		if (unlikely(!inode))
-			break;
-		if (au_iigen(inode, NULL) != sigen) {
-			ii_write_lock_child(inode);
-			e = au_refresh_hinode_self(inode);
-			ii_write_unlock(inode);
-			if (unlikely(e)) {
-				pr_err("error %d, i%lu\n", e, inode->i_ino);
-				if (!err)
-					err = e;
-				/* go on even if err */
-			}
-		}
-	}
-
-	au_iarray_free(array, max);
-
-out:
-	return err;
-}
-
-static void au_remount_refresh(struct super_block *sb)
-{
-	int err, e;
-	unsigned int udba;
-	aufs_bindex_t bindex, bend;
-	struct dentry *root;
-	struct inode *inode;
-	struct au_branch *br;
-
-	au_sigen_inc(sb);
-	au_fclr_si(au_sbi(sb), FAILED_REFRESH_DIR);
-
-	root = sb->s_root;
-	DiMustNoWaiters(root);
-	inode = d_inode(root);
-	IiMustNoWaiters(inode);
-
-	udba = au_opt_udba(sb);
-	bend = au_sbend(sb);
-	for (bindex = 0; bindex <= bend; bindex++) {
-		br = au_sbr(sb, bindex);
-		err = au_hnotify_reset_br(udba, br, br->br_perm);
-		if (unlikely(err))
-			AuIOErr("hnotify failed on br %d, %d, ignored\n",
-				bindex, err);
-		/* go on even if err */
-	}
-	au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1));
-
-	di_write_unlock(root);
-	err = au_refresh_d(sb);
-	e = au_refresh_i(sb);
-	if (unlikely(e && !err))
-		err = e;
-	/* aufs_write_lock() calls ..._child() */
-	di_write_lock_child(root);
-
-	au_cpup_attr_all(inode, /*force*/1);
-
-	if (unlikely(err))
-		AuIOErr("refresh failed, ignored, %d\n", err);
-}
-
-/* stop extra interpretation of errno in mount(8), and strange error messages */
-static int cvt_err(int err)
-{
-	AuTraceErr(err);
-
-	switch (err) {
-	case -ENOENT:
-	case -ENOTDIR:
-	case -EEXIST:
-	case -EIO:
-		err = -EINVAL;
-	}
-	return err;
-}
-
-static int aufs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
-	int err, do_dx;
-	unsigned int mntflags;
-	struct au_opts opts;
-	struct dentry *root;
-	struct inode *inode;
-	struct au_sbinfo *sbinfo;
-
-	err = 0;
-	root = sb->s_root;
-	if (!data || !*data) {
-		err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-		if (!err) {
-			di_write_lock_child(root);
-			err = au_opts_verify(sb, *flags, /*pending*/0);
-			aufs_write_unlock(root);
-		}
-		goto out;
-	}
-
-	err = -ENOMEM;
-	memset(&opts, 0, sizeof(opts));
-	opts.opt = (void *)__get_free_page(GFP_NOFS);
-	if (unlikely(!opts.opt))
-		goto out;
-	opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
-	opts.flags = AuOpts_REMOUNT;
-	opts.sb_flags = *flags;
-
-	/* parse it before aufs lock */
-	err = au_opts_parse(sb, data, &opts);
-	if (unlikely(err))
-		goto out_opts;
-
-	sbinfo = au_sbi(sb);
-	inode = d_inode(root);
-	mutex_lock(&inode->i_mutex);
-	err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-	if (unlikely(err))
-		goto out_mtx;
-	di_write_lock_child(root);
-
-	/* au_opts_remount() may return an error */
-	err = au_opts_remount(sb, &opts);
-	au_opts_free(&opts);
-
-	if (au_ftest_opts(opts.flags, REFRESH))
-		au_remount_refresh(sb);
-
-	if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) {
-		mntflags = au_mntflags(sb);
-		do_dx = !!au_opt_test(mntflags, DIO);
-		au_dy_arefresh(do_dx);
-	}
-
-	au_fhsm_wrote_all(sb, /*force*/1); /* ?? */
-	aufs_write_unlock(root);
-
-out_mtx:
-	mutex_unlock(&inode->i_mutex);
-out_opts:
-	free_page((unsigned long)opts.opt);
-out:
-	err = cvt_err(err);
-	AuTraceErr(err);
-	return err;
-}
-
-static const struct super_operations aufs_sop = {
-	.alloc_inode	= aufs_alloc_inode,
-	.destroy_inode	= aufs_destroy_inode,
-	/* always deleting, no clearing */
-	.drop_inode	= generic_delete_inode,
-	.show_options	= aufs_show_options,
-	.statfs		= aufs_statfs,
-	.put_super	= aufs_put_super,
-	.sync_fs	= aufs_sync_fs,
-	.remount_fs	= aufs_remount_fs
-};
-
-/* ---------------------------------------------------------------------- */
-
-static int alloc_root(struct super_block *sb)
-{
-	int err;
-	struct inode *inode;
-	struct dentry *root;
-
-	err = -ENOMEM;
-	inode = au_iget_locked(sb, AUFS_ROOT_INO);
-	err = PTR_ERR(inode);
-	if (IS_ERR(inode))
-		goto out;
-
-	inode->i_op = &aufs_dir_iop;
-	inode->i_fop = &aufs_dir_fop;
-	inode->i_mode = S_IFDIR;
-	set_nlink(inode, 2);
-	unlock_new_inode(inode);
-
-	root = d_make_root(inode);
-	if (unlikely(!root))
-		goto out;
-	err = PTR_ERR(root);
-	if (IS_ERR(root))
-		goto out;
-
-	err = au_di_init(root);
-	if (!err) {
-		sb->s_root = root;
-		return 0; /* success */
-	}
-	dput(root);
-
-out:
-	return err;
-}
-
-static int aufs_fill_super(struct super_block *sb, void *raw_data,
-			   int silent __maybe_unused)
-{
-	int err;
-	struct au_opts opts;
-	struct dentry *root;
-	struct inode *inode;
-	char *arg = raw_data;
-
-	if (unlikely(!arg || !*arg)) {
-		err = -EINVAL;
-		pr_err("no arg\n");
-		goto out;
-	}
-
-	err = -ENOMEM;
-	memset(&opts, 0, sizeof(opts));
-	opts.opt = (void *)__get_free_page(GFP_NOFS);
-	if (unlikely(!opts.opt))
-		goto out;
-	opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
-	opts.sb_flags = sb->s_flags;
-
-	err = au_si_alloc(sb);
-	if (unlikely(err))
-		goto out_opts;
-
-	/* all timestamps always follow the ones on the branch */
-	sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
-	sb->s_op = &aufs_sop;
-	sb->s_d_op = &aufs_dop;
-	sb->s_magic = AUFS_SUPER_MAGIC;
-	sb->s_maxbytes = 0;
-	sb->s_stack_depth = 1;
-	au_export_init(sb);
-	/* au_xattr_init(sb); */
-
-	err = alloc_root(sb);
-	if (unlikely(err)) {
-		si_write_unlock(sb);
-		goto out_info;
-	}
-	root = sb->s_root;
-	inode = d_inode(root);
-
-	/*
-	 * actually we can parse options regardless aufs lock here.
-	 * but at remount time, parsing must be done before aufs lock.
-	 * so we follow the same rule.
-	 */
-	ii_write_lock_parent(inode);
-	aufs_write_unlock(root);
-	err = au_opts_parse(sb, arg, &opts);
-	if (unlikely(err))
-		goto out_root;
-
-	/* lock vfs_inode first, then aufs. */
-	mutex_lock(&inode->i_mutex);
-	aufs_write_lock(root);
-	err = au_opts_mount(sb, &opts);
-	au_opts_free(&opts);
-	aufs_write_unlock(root);
-	mutex_unlock(&inode->i_mutex);
-	if (!err)
-		goto out_opts; /* success */
-
-out_root:
-	dput(root);
-	sb->s_root = NULL;
-out_info:
-	dbgaufs_si_fin(au_sbi(sb));
-	kobject_put(&au_sbi(sb)->si_kobj);
-	sb->s_fs_info = NULL;
-out_opts:
-	free_page((unsigned long)opts.opt);
-out:
-	AuTraceErr(err);
-	err = cvt_err(err);
-	AuTraceErr(err);
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags,
-				 const char *dev_name __maybe_unused,
-				 void *raw_data)
-{
-	struct dentry *root;
-	struct super_block *sb;
-
-	/* all timestamps always follow the ones on the branch */
-	/* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */
-	root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super);
-	if (IS_ERR(root))
-		goto out;
-
-	sb = root->d_sb;
-	si_write_lock(sb, !AuLock_FLUSH);
-	sysaufs_brs_add(sb, 0);
-	si_write_unlock(sb);
-	au_sbilist_add(sb);
-
-out:
-	return root;
-}
-
-static void aufs_kill_sb(struct super_block *sb)
-{
-	struct au_sbinfo *sbinfo;
-
-	sbinfo = au_sbi(sb);
-	if (sbinfo) {
-		au_sbilist_del(sb);
-		aufs_write_lock(sb->s_root);
-		au_fhsm_fin(sb);
-		if (sbinfo->si_wbr_create_ops->fin)
-			sbinfo->si_wbr_create_ops->fin(sb);
-		if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) {
-			au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE);
-			au_remount_refresh(sb);
-		}
-		if (au_opt_test(sbinfo->si_mntflags, PLINK))
-			au_plink_put(sb, /*verbose*/1);
-		au_xino_clr(sb);
-		sbinfo->si_sb = NULL;
-		aufs_write_unlock(sb->s_root);
-		au_nwt_flush(&sbinfo->si_nowait);
-	}
-	kill_anon_super(sb);
-}
-
-struct file_system_type aufs_fs_type = {
-	.name		= AUFS_FSTYPE,
-	/* a race between rename and others */
-	.fs_flags	= FS_RENAME_DOES_D_MOVE,
-	.mount		= aufs_mount,
-	.kill_sb	= aufs_kill_sb,
-	/* no need to __module_get() and module_put(). */
-	.owner		= THIS_MODULE,
-};