[PATCH 21/67] aufs mount options/flags, source

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From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>

	initial commit
	aufs mount options/flags, source

Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
 fs/aufs/opts.c | 1493 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 1493 insertions(+), 0 deletions(-)

diff --git a/fs/aufs/opts.c b/fs/aufs/opts.c
new file mode 100644
index 0000000..0c4b64d
--- /dev/null
+++ b/fs/aufs/opts.c
@@ -0,0 +1,1493 @@
+/*
+ * Copyright (C) 2005-2008 Junjiro 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/*
+ * mount options/flags
+ *
+ * $Id: opts.c,v 1.4 2008/05/04 23:51:41 sfjro Exp $
+ */
+
+#include <linux/types.h> /* a distribution requires */
+#include <linux/parser.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+enum {
+	Opt_br,
+	Opt_add, Opt_del, Opt_mod, Opt_reorder, Opt_append, Opt_prepend,
+	Opt_idel, Opt_imod, Opt_ireorder,
+	Opt_dirwh, Opt_rdcache, Opt_deblk, Opt_nhash, Opt_rendir,
+	Opt_xino, Opt_zxino, Opt_noxino,
+	Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino,
+	Opt_trunc_xino_path, Opt_itrunc_xino,
+	Opt_xinodir, Opt_xinonames, Opt_ixinonames,
+	Opt_trunc_xib, Opt_notrunc_xib,
+	Opt_dirperm1, Opt_nodirperm1,
+	Opt_shwh, Opt_noshwh,
+	Opt_plink, Opt_noplink, Opt_list_plink, Opt_clean_plink,
+	Opt_udba,
+	//Opt_lock, Opt_unlock,
+	Opt_cmd, Opt_cmd_args,
+	Opt_diropq_a, Opt_diropq_w,
+	Opt_warn_perm, Opt_nowarn_perm,
+	Opt_wbr_copyup, Opt_wbr_create,
+	Opt_coo,
+	Opt_dlgt, Opt_nodlgt,
+	Opt_refrof, Opt_norefrof,
+	Opt_verbose, Opt_noverbose,
+	Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err
+};
+
+static match_table_t options = {
+	{Opt_br, "br=%s"},
+	{Opt_br, "br:%s"},
+
+	{Opt_add, "add=%d:%s"},
+	{Opt_add, "add:%d:%s"},
+	{Opt_add, "ins=%d:%s"},
+	{Opt_add, "ins:%d:%s"},
+	{Opt_append, "append=%s"},
+	{Opt_append, "append:%s"},
+	{Opt_prepend, "prepend=%s"},
+	{Opt_prepend, "prepend:%s"},
+
+	{Opt_del, "del=%s"},
+	{Opt_del, "del:%s"},
+	//{Opt_idel, "idel:%d"},
+	{Opt_mod, "mod=%s"},
+	{Opt_mod, "mod:%s"},
+	{Opt_imod, "imod:%d:%s"},
+
+	{Opt_dirwh, "dirwh=%d"},
+	{Opt_dirwh, "dirwh:%d"},
+
+	{Opt_xino, "xino=%s"},
+	{Opt_xino, "xino:%s"},
+	{Opt_xinodir, "xinodir=%s"},
+	{Opt_xinodir, "xinodir:%s"},
+	{Opt_noxino, "noxino"},
+	{Opt_trunc_xino, "trunc_xino"},
+	{Opt_trunc_xino_v, "trunc_xino_v=%d:%d"},
+	{Opt_notrunc_xino, "notrunc_xino"},
+	{Opt_trunc_xino_path, "trunc_xino=%s"},
+	{Opt_trunc_xino_path, "trunc_xino:%s"},
+	{Opt_itrunc_xino, "itrunc_xino=%d"},
+	{Opt_itrunc_xino, "itrunc_xino:%d"},
+	//{Opt_zxino, "zxino=%s"},
+	{Opt_trunc_xib, "trunc_xib"},
+	{Opt_notrunc_xib, "notrunc_xib"},
+
+	{Opt_plink, "plink"},
+	{Opt_noplink, "noplink"},
+#ifdef CONFIG_AUFS_DEBUG
+	{Opt_list_plink, "list_plink"},
+#endif
+	{Opt_clean_plink, "clean_plink"},
+
+	{Opt_udba, "udba=%s"},
+
+	{Opt_diropq_a, "diropq=always"},
+	{Opt_diropq_a, "diropq=a"},
+	{Opt_diropq_w, "diropq=whiteouted"},
+	{Opt_diropq_w, "diropq=w"},
+
+	{Opt_warn_perm, "warn_perm"},
+	{Opt_nowarn_perm, "nowarn_perm"},
+
+#ifdef CONFIG_AUFS_DLGT
+	{Opt_dlgt, "dlgt"},
+	{Opt_nodlgt, "nodlgt"},
+
+	{Opt_dirperm1, "dirperm1"},
+	{Opt_nodirperm1, "nodirperm1"},
+#endif
+
+#ifdef CONFIG_AUFS_SHWH
+	{Opt_shwh, "shwh"},
+	{Opt_noshwh, "noshwh"},
+#endif
+
+	{Opt_rendir, "rendir=%d"},
+	{Opt_rendir, "rendir:%d"},
+
+	{Opt_refrof, "refrof"},
+	{Opt_norefrof, "norefrof"},
+
+	{Opt_verbose, "verbose"},
+	{Opt_verbose, "v"},
+	{Opt_noverbose, "noverbose"},
+	{Opt_noverbose, "quiet"},
+	{Opt_noverbose, "q"},
+	{Opt_noverbose, "silent"},
+
+	{Opt_rdcache, "rdcache=%d"},
+	{Opt_rdcache, "rdcache:%d"},
+
+	{Opt_coo, "coo=%s"},
+
+	{Opt_wbr_create, "create=%s"},
+	{Opt_wbr_create, "create:%s"},
+	{Opt_wbr_create, "create_policy=%s"},
+	{Opt_wbr_create, "create_policy:%s"},
+	{Opt_wbr_copyup, "cpup=%s"},
+	{Opt_wbr_copyup, "cpup:%s"},
+	{Opt_wbr_copyup, "copyup=%s"},
+	{Opt_wbr_copyup, "copyup:%s"},
+	{Opt_wbr_copyup, "copyup_policy=%s"},
+	{Opt_wbr_copyup, "copyup_policy:%s"},
+
+	/* internal use for the scripts */
+	{Opt_ignore_silent, "si=%s"},
+
+#if 0 // rfu
+	{Opt_deblk, "deblk=%d"},
+	{Opt_deblk, "deblk:%d"},
+	{Opt_nhash, "nhash=%d"},
+	{Opt_nhash, "nhash:%d"},
+#endif
+
+	{Opt_br, "dirs=%s"},
+	{Opt_ignore, "debug=%d"},
+	{Opt_ignore, "delete=whiteout"},
+	{Opt_ignore, "delete=all"},
+	{Opt_ignore, "imap=%s"},
+
+	{Opt_err, NULL}
+};
+
+/* ---------------------------------------------------------------------- */
+
+static const char *au_parser_pattern(int val, struct match_token *token)
+{
+	while (token->pattern) {
+		if (token->token == val)
+			return token->pattern;
+		token++;
+	}
+	BUG();
+	return "??";
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define RW		"rw"
+#define RO		"ro"
+#define WH		"wh"
+#define RR		"rr"
+#define NoLinkWH	"nolwh"
+
+static match_table_t brperms = {
+	{AuBr_RR, RR},
+	{AuBr_RO, RO},
+	{AuBr_RW, RW},
+
+	{AuBr_RRWH, RR "+" WH},
+	{AuBr_ROWH, RO "+" WH},
+	{AuBr_RWNoLinkWH, RW "+" NoLinkWH},
+
+	{AuBr_ROWH, "nfsro"},
+	{AuBr_RO, NULL}
+};
+
+static noinline_for_stack int br_perm_val(char *perm)
+{
+	int val;
+	substring_t args[MAX_OPT_ARGS];
+
+	AuDebugOn(!perm || !*perm);
+	LKTRTrace("perm %s\n", perm);
+	val = match_token(perm, brperms, args);
+	AuTraceErr(val);
+	return val;
+}
+
+const char *au_optstr_br_perm(int brperm)
+{
+	return au_parser_pattern(brperm, brperms);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t udbalevel = {
+	{AuOpt_UDBA_REVAL, "reval"},
+#ifdef CONFIG_AUFS_HINOTIFY
+	{AuOpt_UDBA_INOTIFY, "inotify"},
+#endif
+	{AuOpt_UDBA_NONE, "none"},
+	{-1, NULL}
+};
+
+static noinline_for_stack int udba_val(char *str)
+{
+	substring_t args[MAX_OPT_ARGS];
+	return match_token(str, udbalevel, args);
+}
+
+const char *au_optstr_udba(int udba)
+{
+	return au_parser_pattern(udba, udbalevel);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t coolevel = {
+	{AuOpt_COO_NONE, "none"},
+	{AuOpt_COO_LEAF, "leaf"},
+	{AuOpt_COO_ALL, "all"},
+	{-1, NULL}
+};
+
+static noinline_for_stack int coo_val(char *str)
+{
+	substring_t args[MAX_OPT_ARGS];
+	return match_token(str, coolevel, args);
+}
+
+const char *au_optstr_coo(int coo)
+{
+	return au_parser_pattern(coo, coolevel);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t au_wbr_create_policy = {
+	{AuWbrCreate_TDP, "tdp"},
+	{AuWbrCreate_TDP, "top-down-parent"},
+	{AuWbrCreate_RR, "rr"},
+	{AuWbrCreate_RR, "round-robin"},
+	{AuWbrCreate_MFS, "mfs"},
+	{AuWbrCreate_MFS, "most-free-space"},
+	{AuWbrCreate_MFSV, "mfs:%d"},
+	{AuWbrCreate_MFSV, "most-free-space:%d"},
+
+	{AuWbrCreate_MFSRR, "mfsrr:%d"},
+	{AuWbrCreate_MFSRRV, "mfsrr:%d:%d"},
+	{AuWbrCreate_PMFS, "pmfs"},
+	{AuWbrCreate_PMFSV, "pmfs:%d"},
+
+	{-1, NULL}
+};
+
+/* cf. linux/lib/parser.c */
+static int au_match_ull(substring_t *s, unsigned long long *result, int base)
+{
+	char *endp;
+	char *buf;
+	int ret;
+
+	buf = kmalloc(s->to - s->from + 1, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+	memcpy(buf, s->from, s->to - s->from);
+	buf[s->to - s->from] = '\0';
+	*result = simple_strtoull(buf, &endp, base);
+	ret = 0;
+	if (endp == buf)
+		ret = -EINVAL;
+	kfree(buf);
+	return ret;
+}
+
+static int au_wbr_mfs_wmark(substring_t *arg, char *str,
+			    struct au_opt_wbr_create *create)
+{
+	int err;
+	u64 ull;
+
+	err = 0;
+	if (!au_match_ull(arg, &ull, 0))
+		create->mfsrr_watermark = ull;
+	else {
+		AuErr("bad integer in %s\n", str);
+		err = -EINVAL;
+	}
+
+	AuTraceErr(err);
+	return err;
+}
+
+static int au_wbr_mfs_sec(substring_t *arg, char *str,
+			  struct au_opt_wbr_create *create)
+{
+	int n, err;
+
+	err = 0;
+	if (!match_int(arg, &n) && 0 <= n)
+		create->mfs_second = n;
+	else {
+		AuErr("bad integer in %s\n", str);
+		err = -EINVAL;
+	}
+
+	AuTraceErr(err);
+	return err;
+}
+
+static noinline_for_stack int
+au_wbr_create_val(char *str, struct au_opt_wbr_create *create)
+{
+	int err, e;
+	substring_t args[MAX_OPT_ARGS];
+
+	err = match_token(str, au_wbr_create_policy, args);
+	create->wbr_create = err;
+	switch (err) {
+	case AuWbrCreate_MFSRRV:
+		e = au_wbr_mfs_wmark(&args[0], str, create);
+		if (!e)
+			e = au_wbr_mfs_sec(&args[1], str, create);
+		if (unlikely(e))
+			err = e;
+		break;
+	case AuWbrCreate_MFSRR:
+		e = au_wbr_mfs_wmark(&args[0], str, create);
+		if (unlikely(e)) {
+			err = e;
+			break;
+		}
+		/*FALLTHROUGH*/
+	case AuWbrCreate_MFS:
+	case AuWbrCreate_PMFS:
+		create->mfs_second = AUFS_MFS_SECOND_DEF;
+		break;
+	case AuWbrCreate_MFSV:
+	case AuWbrCreate_PMFSV:
+		e = au_wbr_mfs_sec(&args[0], str, create);
+		if (unlikely(e))
+			err = e;
+		break;
+	}
+
+	return err;
+}
+
+const char *au_optstr_wbr_create(int wbr_create)
+{
+	return au_parser_pattern(wbr_create, au_wbr_create_policy);
+}
+
+static match_table_t au_wbr_copyup_policy = {
+	{AuWbrCopyup_TDP, "tdp"},
+	{AuWbrCopyup_TDP, "top-down-parent"},
+	{AuWbrCopyup_BUP, "bup"},
+	{AuWbrCopyup_BUP, "bottom-up-parent"},
+	{AuWbrCopyup_BU, "bu"},
+	{AuWbrCopyup_BU, "bottom-up"},
+	{-1, NULL}
+};
+
+static noinline_for_stack int au_wbr_copyup_val(char *str)
+{
+	substring_t args[MAX_OPT_ARGS];
+	return match_token(str, au_wbr_copyup_policy, args);
+}
+
+const char *au_optstr_wbr_copyup(int wbr_copyup)
+{
+	return au_parser_pattern(wbr_copyup, au_wbr_copyup_policy);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
+
+static noinline_for_stack void dump_opts(struct au_opts *opts)
+{
+#ifdef CONFIG_AUFS_DEBUG
+	/* reduce stack space */
+	union {
+		struct au_opt_add *add;
+		struct au_opt_del *del;
+		struct au_opt_mod *mod;
+		struct au_opt_xino *xino;
+		struct au_opt_xino_itrunc *xino_itrunc;
+		struct au_opt_wbr_create *create;
+	} u;
+	struct au_opt *opt;
+
+	AuTraceEnter();
+
+	opt = opts->opt;
+	while (/* opt < opts_tail && */ opt->type != Opt_tail) {
+		switch (opt->type) {
+		case Opt_add:
+			u.add = &opt->add;
+			LKTRTrace("add {b%d, %s, 0x%x, %p}\n",
+				  u.add->bindex, u.add->path, u.add->perm,
+				  u.add->nd.path.dentry);
+			break;
+		case Opt_del:
+		case Opt_idel:
+			u.del = &opt->del;
+			LKTRTrace("del {%s, %p}\n", u.del->path, u.del->h_root);
+			break;
+		case Opt_mod:
+		case Opt_imod:
+			u.mod = &opt->mod;
+			LKTRTrace("mod {%s, 0x%x, %p}\n",
+				  u.mod->path, u.mod->perm, u.mod->h_root);
+			break;
+		case Opt_append:
+			u.add = &opt->add;
+			LKTRTrace("append {b%d, %s, 0x%x, %p}\n",
+				  u.add->bindex, u.add->path, u.add->perm,
+				  u.add->nd.path.dentry);
+			break;
+		case Opt_prepend:
+			u.add = &opt->add;
+			LKTRTrace("prepend {b%d, %s, 0x%x, %p}\n",
+				  u.add->bindex, u.add->path, u.add->perm,
+				  u.add->nd.path.dentry);
+			break;
+		case Opt_dirwh:
+			LKTRTrace("dirwh %d\n", opt->dirwh);
+			break;
+		case Opt_rdcache:
+			LKTRTrace("rdcache %d\n", opt->rdcache);
+			break;
+		case Opt_xino:
+			u.xino = &opt->xino;
+			LKTRTrace("xino {%s %.*s}\n",
+				  u.xino->path,
+				  AuDLNPair(u.xino->file->f_dentry));
+			break;
+		case Opt_trunc_xino:
+			LKTRLabel(trunc_xino);
+			break;
+		case Opt_notrunc_xino:
+			LKTRLabel(notrunc_xino);
+			break;
+		case Opt_trunc_xino_path:
+		case Opt_itrunc_xino:
+			u.xino_itrunc = &opt->xino_itrunc;
+			LKTRTrace("trunc_xino %d\n", u.xino_itrunc->bindex);
+			break;
+
+		case Opt_noxino:
+			LKTRLabel(noxino);
+			break;
+		case Opt_trunc_xib:
+			LKTRLabel(trunc_xib);
+			break;
+		case Opt_notrunc_xib:
+			LKTRLabel(notrunc_xib);
+			break;
+		case Opt_dirperm1:
+			LKTRLabel(dirperm1);
+			break;
+		case Opt_nodirperm1:
+			LKTRLabel(nodirperm1);
+			break;
+		case Opt_shwh:
+			LKTRLabel(shwh);
+			break;
+		case Opt_noshwh:
+			LKTRLabel(noshwh);
+			break;
+		case Opt_plink:
+			LKTRLabel(plink);
+			break;
+		case Opt_noplink:
+			LKTRLabel(noplink);
+			break;
+		case Opt_list_plink:
+			LKTRLabel(list_plink);
+			break;
+		case Opt_clean_plink:
+			LKTRLabel(clean_plink);
+			break;
+		case Opt_udba:
+			LKTRTrace("udba %d, %s\n",
+				  opt->udba, au_optstr_udba(opt->udba));
+			break;
+		case Opt_diropq_a:
+			LKTRLabel(diropq_a);
+			break;
+		case Opt_diropq_w:
+			LKTRLabel(diropq_w);
+			break;
+		case Opt_warn_perm:
+			LKTRLabel(warn_perm);
+			break;
+		case Opt_nowarn_perm:
+			LKTRLabel(nowarn_perm);
+			break;
+		case Opt_dlgt:
+			LKTRLabel(dlgt);
+			break;
+		case Opt_nodlgt:
+			LKTRLabel(nodlgt);
+			break;
+		case Opt_refrof:
+			LKTRLabel(refrof);
+			break;
+		case Opt_norefrof:
+			LKTRLabel(norefrof);
+			break;
+		case Opt_verbose:
+			LKTRLabel(verbose);
+			break;
+		case Opt_noverbose:
+			LKTRLabel(noverbose);
+			break;
+		case Opt_coo:
+			LKTRTrace("coo %d, %s\n",
+				  opt->coo, au_optstr_coo(opt->coo));
+			break;
+		case Opt_wbr_create:
+			u.create = &opt->wbr_create;
+			LKTRTrace("create %d, %s\n", u.create->wbr_create,
+				  au_optstr_wbr_create(u.create->wbr_create));
+			switch (u.create->wbr_create) {
+			case AuWbrCreate_MFSV:
+			case AuWbrCreate_PMFSV:
+				LKTRTrace("%d sec\n", u.create->mfs_second);
+				break;
+			case AuWbrCreate_MFSRR:
+				LKTRTrace("%Lu watermark\n",
+					  u.create->mfsrr_watermark);
+				break;
+			case AuWbrCreate_MFSRRV:
+				LKTRTrace("%Lu watermark, %d sec\n",
+					  u.create->mfsrr_watermark,
+					  u.create->mfs_second);
+				break;
+			}
+			break;
+		case Opt_wbr_copyup:
+			LKTRTrace("copyup %d, %s\n", opt->wbr_copyup,
+				  au_optstr_wbr_copyup(opt->wbr_copyup));
+			break;
+		default:
+			BUG();
+		}
+		opt++;
+	}
+#endif
+}
+
+void au_opts_free(struct au_opts *opts)
+{
+	struct au_opt *opt;
+
+	AuTraceEnter();
+
+	opt = opts->opt;
+	while (opt->type != Opt_tail) {
+		switch (opt->type) {
+		case Opt_add:
+		case Opt_append:
+		case Opt_prepend:
+			path_put(&opt->add.nd.path);
+			break;
+		case Opt_del:
+		case Opt_idel:
+			dput(opt->del.h_root);
+			break;
+		case Opt_mod:
+		case Opt_imod:
+			dput(opt->mod.h_root);
+			break;
+		case Opt_xino:
+			fput(opt->xino.file);
+			break;
+		}
+		opt++;
+	}
+}
+
+static int opt_add(struct au_opt *opt, char *opt_str, struct super_block *sb,
+		   aufs_bindex_t bindex)
+{
+	int err;
+	struct au_opt_add *add = &opt->add;
+	char *p;
+
+	LKTRTrace("%s, b%d\n", opt_str, bindex);
+
+	add->bindex = bindex;
+	add->perm = AuBr_Last;
+	add->path = opt_str;
+	p = strchr(opt_str, '=');
+	if (unlikely(p)) {
+		*p++ = 0;
+		if (*p)
+			add->perm = br_perm_val(p);
+	}
+
+	/* LSM may detect it */
+	/* do not superio. */
+	err = vfsub_path_lookup(add->path, lkup_dirflags, &add->nd);
+	//err = -1;
+	if (!err) {
+		if (!p /* && add->perm == AuBr_Last */) {
+			add->perm = AuBr_RO;
+			if (au_test_def_rr(add->nd.path.dentry->d_sb))
+				add->perm = AuBr_RR;
+			if (!bindex && !(sb->s_flags & MS_RDONLY))
+				add->perm = AuBr_RW;
+#ifdef CONFIG_AUFS_COMPAT
+			add->perm = AuBr_RW;
+#endif
+		}
+		opt->type = Opt_add;
+		goto out;
+	}
+	AuErr("lookup failed %s (%d)\n", add->path, err);
+	err = -EINVAL;
+
+ out:
+	AuTraceErr(err);
+	return err;
+}
+
+/* called without aufs lock */
+int au_opts_parse(struct super_block *sb, unsigned long flags, char *str,
+		  struct au_opts *opts)
+{
+	int err, n, token, skipped;
+	struct dentry *root;
+	struct au_opt *opt, *opt_tail;
+	char *opt_str, *p;
+	substring_t args[MAX_OPT_ARGS];
+	aufs_bindex_t bindex, bend;
+	struct nameidata nd;
+	union {
+		struct au_opt_del *del;
+		struct au_opt_mod *mod;
+		struct au_opt_xino *xino;
+		struct au_opt_xino_itrunc *xino_itrunc;
+		struct au_opt_wbr_create *create;
+	} u;
+	struct file *file;
+
+	LKTRTrace("%s, nopts %d\n", str, opts->max_opt);
+
+	root = sb->s_root;
+	err = 0;
+	bindex = 0;
+	opt = opts->opt;
+	opt_tail = opt + opts->max_opt - 1;
+	opt->type = Opt_tail;
+	while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
+		err = -EINVAL;
+		token = match_token(opt_str, options, args);
+		LKTRTrace("%s, token %d, args[0]{%p, %p}\n",
+			  opt_str, token, args[0].from, args[0].to);
+
+		skipped = 0;
+		switch (token) {
+		case Opt_br:
+			err = 0;
+			while (!err && (opt_str = strsep(&args[0].from, ":"))
+			       && *opt_str) {
+				err = opt_add(opt, opt_str, sb, bindex++);
+				//if (LktrCond) err = -1;
+				if (unlikely(!err && ++opt > opt_tail)) {
+					err = -E2BIG;
+					break;
+				}
+				opt->type = Opt_tail;
+				skipped = 1;
+			}
+			break;
+		case Opt_add:
+			if (unlikely(match_int(&args[0], &n))) {
+				AuErr("bad integer in %s\n", opt_str);
+				break;
+			}
+			bindex = n;
+			err = opt_add(opt, args[1].from, sb, bindex);
+			break;
+		case Opt_append:
+			err = opt_add(opt, args[0].from, sb, /*dummy bindex*/1);
+			if (!err)
+				opt->type = token;
+			break;
+		case Opt_prepend:
+			err = opt_add(opt, args[0].from, sb, /*bindex*/0);
+			if (!err)
+				opt->type = token;
+			break;
+		case Opt_del:
+			u.del = &opt->del;
+			u.del->path = args[0].from;
+			LKTRTrace("del path %s\n", u.del->path);
+			/* LSM may detect it */
+			/* do not superio. */
+			err = vfsub_path_lookup(u.del->path, lkup_dirflags,
+						&nd);
+			if (unlikely(err)) {
+				AuErr("lookup failed %s (%d)\n",
+				      u.del->path, err);
+				break;
+			}
+			u.del->h_root = dget(nd.path.dentry);
+			path_put(&nd.path);
+			opt->type = token;
+			break;
+#if 0 // rfu
+		case Opt_idel:
+			u.del = &opt->del;
+			u.del->path = "(indexed)";
+			if (unlikely(match_int(&args[0], &n))) {
+				AuErr("bad integer in %s\n", opt_str);
+				break;
+			}
+			bindex = n;
+			aufs_read_lock(root, AuLock_FLUSH);
+			if (bindex < 0 || au_sbend(sb) < bindex) {
+				AuErr("out of bounds, %d\n", bindex);
+				aufs_read_unlock(root, !AuLock_IR);
+				break;
+			}
+			err = 0;
+			u.del->h_root = dget(au_h_dptr(root, bindex));
+			opt->type = token;
+			aufs_read_unlock(root, !AuLock_IR);
+			break;
+#endif
+		case Opt_mod:
+			u.mod = &opt->mod;
+			u.mod->path = args[0].from;
+			p = strchr(u.mod->path, '=');
+			if (unlikely(!p)) {
+				AuErr("no permssion %s\n", opt_str);
+				break;
+			}
+			*p++ = 0;
+			u.mod->perm = br_perm_val(p);
+			LKTRTrace("mod path %s, perm 0x%x, %s\n",
+				  u.mod->path, u.mod->perm, p);
+			/* LSM may detect it */
+			/* do not superio. */
+			err = vfsub_path_lookup(u.mod->path, lkup_dirflags,
+						&nd);
+			if (unlikely(err)) {
+				AuErr("lookup failed %s (%d)\n",
+				      u.mod->path, err);
+				break;
+			}
+			u.mod->h_root = dget(nd.path.dentry);
+			path_put(&nd.path);
+			opt->type = token;
+			break;
+#ifdef IMOD
+		case Opt_imod:
+			u.mod = &opt->mod;
+			u.mod->path = "(indexed)";
+			if (unlikely(match_int(&args[0], &n))) {
+				AuErr("bad integer in %s\n", opt_str);
+				break;
+			}
+			bindex = n;
+			aufs_read_lock(root, AuLock_FLUSH);
+			if (bindex < 0 || au_sbend(sb) < bindex) {
+				AuErr("out of bounds, %d\n", bindex);
+				aufs_read_unlock(root, !AuLock_IR);
+				break;
+			}
+			u.mod->perm = br_perm_val(args[1].from);
+			LKTRTrace("mod path %s, perm 0x%x, %s\n",
+				  u.mod->path, u.mod->perm, args[1].from);
+			err = 0;
+			u.mod->h_root = dget(au_h_dptr(root, bindex));
+			opt->type = token;
+			aufs_read_unlock(root, !AuLock_IR);
+			break;
+#endif
+		case Opt_xino:
+			u.xino = &opt->xino;
+			file = au_xino_create(sb, args[0].from, /*silent*/0,
+					      /*parent*/NULL);
+			err = PTR_ERR(file);
+			if (IS_ERR(file))
+				break;
+			err = -EINVAL;
+			if (unlikely(file->f_dentry->d_sb == sb)) {
+				fput(file);
+				AuErr("%s must be outside\n", args[0].from);
+				break;
+			}
+			err = 0;
+			u.xino->file = file;
+			u.xino->path = args[0].from;
+			opt->type = token;
+			break;
+
+		case Opt_trunc_xino_path:
+			u.xino_itrunc = &opt->xino_itrunc;
+			p = args[0].from;
+			LKTRTrace("trunc_xino path %s\n", p);
+			/* LSM may detect it */
+			/* do not superio. */
+			err = vfsub_path_lookup(p, lkup_dirflags, &nd);
+			if (unlikely(err)) {
+				AuErr("lookup failed %s (%d)\n", p , err);
+				break;
+			}
+			u.xino_itrunc->bindex = -1;
+			aufs_read_lock(root, AuLock_FLUSH);
+			bend = au_sbend(sb);
+			for (bindex = 0; bindex <= bend; bindex++) {
+				if (au_h_dptr(root, bindex) == nd.path.dentry) {
+					u.xino_itrunc->bindex = bindex;
+					break;
+				}
+			}
+			aufs_read_unlock(root, !AuLock_IR);
+			path_put(&nd.path);
+			if (unlikely(u.xino_itrunc->bindex < 0)) {
+				AuErr("no such branch %s\n", p);
+				err = -EINVAL;
+				break;
+			}
+			opt->type = token;
+			break;
+
+		case Opt_itrunc_xino:
+			u.xino_itrunc = &opt->xino_itrunc;
+			if (unlikely(match_int(&args[0], &n))) {
+				AuErr("bad integer in %s\n", opt_str);
+				break;
+			}
+			u.xino_itrunc->bindex = n;
+			aufs_read_lock(root, AuLock_FLUSH);
+			if (n < 0 || au_sbend(sb) < n) {
+				AuErr("out of bounds, %d\n", n);
+				aufs_read_unlock(root, !AuLock_IR);
+				break;
+			}
+			aufs_read_unlock(root, !AuLock_IR);
+			err = 0;
+			opt->type = token;
+			break;
+
+		case Opt_dirwh:
+			if (unlikely(match_int(&args[0], &opt->dirwh)))
+				break;
+			err = 0;
+			opt->type = token;
+			break;
+
+		case Opt_rdcache:
+			if (unlikely(match_int(&args[0], &opt->rdcache)))
+				break;
+			err = 0;
+			opt->type = token;
+			break;
+
+		case Opt_shwh:
+			if (flags & MS_RDONLY) {
+				err = 0;
+				opt->type = token;
+			} else
+				AuErr("shwh requires ro\n");
+			break;
+
+		case Opt_trunc_xino:
+		case Opt_notrunc_xino:
+		case Opt_noxino:
+		case Opt_trunc_xib:
+		case Opt_notrunc_xib:
+		case Opt_dirperm1:
+		case Opt_nodirperm1:
+		case Opt_noshwh:
+		case Opt_plink:
+		case Opt_noplink:
+		case Opt_list_plink:
+		case Opt_clean_plink:
+		case Opt_diropq_a:
+		case Opt_diropq_w:
+		case Opt_warn_perm:
+		case Opt_nowarn_perm:
+		case Opt_dlgt:
+		case Opt_nodlgt:
+		case Opt_refrof:
+		case Opt_norefrof:
+		case Opt_verbose:
+		case Opt_noverbose:
+			err = 0;
+			opt->type = token;
+			break;
+
+		case Opt_udba:
+			opt->udba = udba_val(args[0].from);
+			if (opt->udba >= 0) {
+				err = 0;
+				opt->type = token;
+			}
+			break;
+
+		case Opt_wbr_create:
+			u.create = &opt->wbr_create;
+			u.create->wbr_create
+				= au_wbr_create_val(args[0].from, u.create);
+			if (u.create->wbr_create >= 0) {
+				err = 0;
+				opt->type = token;
+			}
+			break;
+		case Opt_wbr_copyup:
+			opt->wbr_copyup = au_wbr_copyup_val(args[0].from);
+			if (opt->wbr_copyup >= 0) {
+				err = 0;
+				opt->type = token;
+			}
+			break;
+
+		case Opt_coo:
+			opt->coo = coo_val(args[0].from);
+			if (opt->coo >= 0) {
+				err = 0;
+				opt->type = token;
+			}
+			break;
+
+		case Opt_ignore:
+#ifndef CONFIG_AUFS_COMPAT
+			AuWarn("ignored %s\n", opt_str);
+#endif
+		case Opt_ignore_silent:
+			skipped = 1;
+			err = 0;
+			break;
+		case Opt_err:
+			AuErr("unknown option %s\n", opt_str);
+			break;
+		}
+
+		if (!err && !skipped) {
+			if (unlikely(++opt > opt_tail)) {
+				err = -E2BIG;
+				opt--;
+				opt->type = Opt_tail;
+				break;
+			}
+			opt->type = Opt_tail;
+		}
+	}
+
+	dump_opts(opts);
+	if (unlikely(err))
+		au_opts_free(opts);
+	AuTraceErr(err);
+	return err;
+}
+
+/*
+ * returns,
+ * plus: processed without an error
+ * zero: unprocessed
+ */
+static int au_opt_simple(struct super_block *sb, struct au_opt *opt,
+			 struct au_opts *opts)
+{
+	int err;
+	struct au_sbinfo *sbinfo;
+	struct au_opt_wbr_create *create;
+
+	AuTraceEnter();
+
+	err = 1; /* handled */
+	sbinfo = au_sbi(sb);
+	switch (opt->type) {
+	case Opt_udba:
+		sbinfo->si_mntflags &= ~AuOptMask_UDBA;
+		sbinfo->si_mntflags |= opt->udba;
+		opts->given_udba |= opt->udba;
+		break;
+
+	case Opt_plink:
+		au_opt_set(sbinfo->si_mntflags, PLINK);
+		break;
+	case Opt_noplink:
+		if (au_opt_test(sbinfo->si_mntflags, PLINK))
+			au_plink_put(sb);
+		au_opt_clr(sbinfo->si_mntflags, PLINK);
+		break;
+	case Opt_list_plink:
+		if (au_opt_test(sbinfo->si_mntflags, PLINK))
+			au_plink_list(sb);
+		break;
+	case Opt_clean_plink:
+		if (au_opt_test(sbinfo->si_mntflags, PLINK))
+			au_plink_put(sb);
+		break;
+
+	case Opt_diropq_a:
+		au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ);
+		break;
+	case Opt_diropq_w:
+		au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ);
+		break;
+
+	case Opt_dlgt:
+		au_opt_set(sbinfo->si_mntflags, DLGT);
+		break;
+	case Opt_nodlgt:
+		au_opt_clr(sbinfo->si_mntflags, DLGT);
+		break;
+
+	case Opt_warn_perm:
+		au_opt_set(sbinfo->si_mntflags, WARN_PERM);
+		break;
+	case Opt_nowarn_perm:
+		au_opt_clr(sbinfo->si_mntflags, WARN_PERM);
+		break;
+
+	case Opt_refrof:
+		au_opt_set(sbinfo->si_mntflags, REFROF);
+		break;
+	case Opt_norefrof:
+		//au_opt_set(sbinfo->si_mntflags, COO_LEAF);
+		au_opt_clr(sbinfo->si_mntflags, REFROF);
+		break;
+
+	case Opt_verbose:
+		au_opt_set(sbinfo->si_mntflags, VERBOSE);
+		break;
+	case Opt_noverbose:
+		au_opt_clr(sbinfo->si_mntflags, VERBOSE);
+		break;
+
+	case Opt_wbr_create:
+		create = &opt->wbr_create;
+		if (sbinfo->si_wbr_create_ops->fin) {
+			err = sbinfo->si_wbr_create_ops->fin(sb);
+			if (!err)
+				err = 1;
+		}
+		sbinfo->si_wbr_create = create->wbr_create;
+		sbinfo->si_wbr_create_ops
+			= au_wbr_create_ops + create->wbr_create;
+		switch (create->wbr_create) {
+		case AuWbrCreate_MFSRRV:
+		case AuWbrCreate_MFSRR:
+			sbinfo->si_wbr_mfs.mfsrr_watermark
+				= create->mfsrr_watermark;
+			/*FALLTHROUGH*/
+		case AuWbrCreate_MFS:
+		case AuWbrCreate_MFSV:
+		case AuWbrCreate_PMFS:
+		case AuWbrCreate_PMFSV:
+			sbinfo->si_wbr_mfs.mfs_expire = create->mfs_second * HZ;
+			break;
+		}
+		if (sbinfo->si_wbr_create_ops->init)
+			sbinfo->si_wbr_create_ops->init(sb); /* ignore */
+		break;
+	case Opt_wbr_copyup:
+		sbinfo->si_wbr_copyup = opt->wbr_copyup;
+		sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup;
+		break;
+
+	case Opt_coo:
+		sbinfo->si_mntflags &= ~AuOptMask_COO;
+		sbinfo->si_mntflags |= opt->coo;
+		break;
+
+	case Opt_dirwh:
+		sbinfo->si_dirwh = opt->dirwh;
+		break;
+
+	case Opt_rdcache:
+		sbinfo->si_rdcache = opt->rdcache * HZ;
+		break;
+
+	case Opt_trunc_xino:
+		au_opt_set(sbinfo->si_mntflags, TRUNC_XINO);
+		break;
+	case Opt_notrunc_xino:
+		au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO);
+		break;
+
+	case Opt_dirperm1:
+		au_opt_set(sbinfo->si_mntflags, DIRPERM1);
+		break;
+	case Opt_nodirperm1:
+		au_opt_clr(sbinfo->si_mntflags, DIRPERM1);
+		break;
+
+	case Opt_shwh:
+		au_opt_set(sbinfo->si_mntflags, SHWH);
+		break;
+	case Opt_noshwh:
+		au_opt_clr(sbinfo->si_mntflags, SHWH);
+		break;
+
+	case Opt_trunc_xino_path:
+	case Opt_itrunc_xino:
+		err = au_xino_trunc(sb, opt->xino_itrunc.bindex);
+		if (!err)
+			err = 1;
+		break;
+
+	case Opt_trunc_xib:
+		au_fset_opts(opts->flags, TRUNC_XIB);
+		break;
+	case Opt_notrunc_xib:
+		au_fclr_opts(opts->flags, TRUNC_XIB);
+		break;
+
+	default:
+		err = 0;
+		break;
+	}
+
+	AuTraceErr(err);
+	return err;
+}
+
+/*
+ * returns tri-state.
+ * plus: processed without an error
+ * zero: unprocessed
+ * minus: error
+ */
+static int au_opt_br(struct super_block *sb, struct au_opt *opt,
+		     struct au_opts *opts)
+{
+	int err, do_refresh;
+
+	AuTraceEnter();
+
+	err = 0;
+	switch (opt->type) {
+	case Opt_append:
+		opt->add.bindex = au_sbend(sb) + 1;
+		if (unlikely(opt->add.bindex < 0))
+			opt->add.bindex = 0;
+		goto add;
+	case Opt_prepend:
+		opt->add.bindex = 0;
+	add:
+	case Opt_add:
+		err = au_br_add(sb, &opt->add,
+				au_ftest_opts(opts->flags, REMOUNT));
+		if (!err) {
+			err = 1;
+			au_fset_opts(opts->flags, REFRESH_DIR);
+			if (unlikely(au_br_whable(opt->add.perm)))
+				au_fset_opts(opts->flags, REFRESH_NONDIR);
+		}
+		break;
+
+	case Opt_del:
+	case Opt_idel:
+		err = au_br_del(sb, &opt->del,
+				au_ftest_opts(opts->flags, REMOUNT));
+		if (!err) {
+			err = 1;
+			au_fset_opts(opts->flags, TRUNC_XIB);
+			au_fset_opts(opts->flags, REFRESH_DIR);
+			au_fset_opts(opts->flags, REFRESH_NONDIR);
+		}
+		break;
+
+	case Opt_mod:
+	case Opt_imod:
+		err = au_br_mod(sb, &opt->mod,
+				au_ftest_opts(opts->flags, REMOUNT),
+				&do_refresh);
+		if (!err) {
+			err = 1;
+			if (unlikely(do_refresh)) {
+				au_fset_opts(opts->flags, REFRESH_DIR);
+				au_fset_opts(opts->flags, REFRESH_NONDIR);
+			}
+		}
+		break;
+	}
+
+	AuTraceErr(err);
+	return err;
+}
+
+static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
+		       struct au_opt_xino **opt_xino, struct au_opts *opts)
+{
+	int err;
+
+	AuTraceEnter();
+
+	err = 0;
+	switch (opt->type) {
+	case Opt_xino:
+		err = au_xino_set(sb, &opt->xino,
+				  au_ftest_opts(opts->flags, REMOUNT));
+		if (!err)
+			*opt_xino = &opt->xino;
+		break;
+	case Opt_noxino:
+		au_xino_clr(sb);
+		*opt_xino = (void *)-1;
+		break;
+	}
+
+	AuTraceErr(err);
+	return err;
+}
+
+static noinline_for_stack int
+verify_opts(struct super_block *sb, unsigned int pending, int remount)
+{
+	int err;
+	aufs_bindex_t bindex, bend;
+	struct au_branch *br;
+	struct dentry *root;
+	struct inode *dir;
+	unsigned int do_plink;
+	unsigned int mnt_flags;
+
+	AuTraceEnter();
+	mnt_flags = au_mntflags(sb);
+	AuDebugOn(!(mnt_flags & AuOptMask_COO));
+	AuDebugOn(!(mnt_flags & AuOptMask_UDBA));
+
+	if (!(sb->s_flags & MS_RDONLY)) {
+		if (unlikely(!au_br_writable(au_sbr_perm(sb, 0))))
+			AuWarn("first branch should be rw\n");
+		if (unlikely(au_opt_test(mnt_flags, SHWH)))
+			AuWarn("shwh should be used with ro\n");
+	}
+
+	if (unlikely(au_opt_test(mnt_flags | pending, UDBA_INOTIFY)
+		     && !au_opt_test(mnt_flags, XINO)))
+		AuWarn("udba=inotify requires xino\n");
+
+	err = 0;
+	root = sb->s_root;
+	dir = sb->s_root->d_inode;
+	do_plink = !!au_opt_test(mnt_flags, PLINK);
+	bend = au_sbend(sb);
+	for (bindex = 0; !err && bindex <= bend; bindex++) {
+		struct inode *h_dir;
+		int skip;
+
+		skip = 0;
+		h_dir = au_h_iptr(dir, bindex);
+		br = au_sbr(sb, bindex);
+		br_wh_read_lock(br);
+		switch (br->br_perm) {
+		case AuBr_RR:
+		case AuBr_RO:
+		case AuBr_RRWH:
+		case AuBr_ROWH:
+			skip = (!br->br_wh && !br->br_plink);
+			break;
+
+		case AuBr_RWNoLinkWH:
+			skip = !br->br_wh;
+			if (skip) {
+				if (do_plink)
+					skip = !!br->br_plink;
+				else
+					skip = !br->br_plink;
+			}
+			break;
+
+		case AuBr_RW:
+			skip = !!br->br_wh;
+			if (skip) {
+				if (do_plink)
+					skip = !!br->br_plink;
+				else
+					skip = !br->br_plink;
+			}
+			break;
+
+		default:
+			BUG();
+		}
+		br_wh_read_unlock(br);
+
+		if (skip)
+			continue;
+
+		au_hdir_lock(h_dir, dir, bindex);
+		br_wh_write_lock(br);
+		err = au_wh_init(au_h_dptr(root, bindex), br,
+				 au_nfsmnt(sb, bindex), sb);
+		br_wh_write_unlock(br);
+		au_hdir_unlock(h_dir, dir, bindex);
+	}
+
+	AuTraceErr(err);
+	return err;
+}
+
+int au_opts_mount(struct super_block *sb, struct au_opts *opts)
+{
+	int err;
+	struct inode *dir;
+	struct au_opt *opt;
+	struct au_opt_xino *opt_xino;
+	aufs_bindex_t bend;
+	struct au_sbinfo *sbinfo;
+	unsigned int tmp;
+
+	AuTraceEnter();
+	SiMustWriteLock(sb);
+	DiMustWriteLock(sb->s_root);
+	dir = sb->s_root->d_inode;
+	IiMustWriteLock(dir);
+
+	err = 0;
+	opt_xino = NULL;
+	opt = opts->opt;
+	while (err >= 0 && opt->type != Opt_tail)
+		err = au_opt_simple(sb, opt++, opts);
+	if (err > 0)
+		err = 0;
+	else if (unlikely(err < 0))
+		goto out;
+
+	/* disable xino, hinotify, dlgt temporary */
+	sbinfo = au_sbi(sb);
+	tmp = sbinfo->si_mntflags;
+	au_opt_clr(sbinfo->si_mntflags, XINO);
+	au_opt_clr(sbinfo->si_mntflags, DLGT);
+	au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL);
+
+	opt = opts->opt;
+	while (err >= 0 && opt->type != Opt_tail)
+		err = au_opt_br(sb, opt++, opts);
+	if (err > 0)
+		err = 0;
+	else if (unlikely(err < 0))
+		goto out;
+
+	bend = au_sbend(sb);
+	if (unlikely(bend < 0)) {
+		err = -EINVAL;
+		AuErr("no branches\n");
+		goto out;
+	}
+
+	if (au_opt_test(tmp, XINO))
+		au_opt_set(sbinfo->si_mntflags, XINO);
+	opt = opts->opt;
+	while (!err && opt->type != Opt_tail)
+		err = au_opt_xino(sb, opt++, &opt_xino, opts);
+	if (unlikely(err))
+		goto out;
+
+	//todo: test this error case.
+	err = verify_opts(sb, tmp, /*remount*/0);
+	if (unlikely(err))
+		goto out;
+
+	/* enable xino */
+	if (au_opt_test(tmp, XINO) && !opt_xino) {
+		struct au_opt_xino xino;
+
+		xino.file = au_xino_def(sb);
+		err = PTR_ERR(xino.file);
+		if (IS_ERR(xino.file))
+			goto out;
+
+		err = au_xino_set(sb, &xino, /*remount*/0);
+		fput(xino.file);
+		if (unlikely(err))
+			goto out;
+	}
+
+	/* restore hinotify */
+	sbinfo->si_mntflags &= ~AuOptMask_UDBA;
+	sbinfo->si_mntflags |= (tmp & AuOptMask_UDBA);
+	if (au_opt_test(tmp, UDBA_INOTIFY))
+		au_reset_hinotify(dir, au_hi_flags(dir, 1) & ~AuHi_XINO);
+
+	/* restore dlgt */
+	if (au_opt_test_dlgt(tmp))
+		au_opt_set(sbinfo->si_mntflags, DLGT);
+
+ out:
+	AuTraceErr(err);
+	return err;
+}
+
+int au_opts_remount(struct super_block *sb, struct au_opts *opts)
+{
+	int err, rerr;
+	struct inode *dir;
+	struct au_opt_xino *opt_xino;
+	struct au_opt *opt;
+	unsigned int dlgt;
+	struct au_sbinfo *sbinfo;
+
+	AuTraceEnter();
+	SiMustWriteLock(sb);
+	DiMustWriteLock(sb->s_root);
+	dir = sb->s_root->d_inode;
+	IiMustWriteLock(dir);
+	sbinfo = au_sbi(sb);
+	//AuDebugOn(au_opt_test(sbifno->si_mntflags, UDBA_INOTIFY));
+
+	err = 0;
+	dlgt = !!au_opt_test_dlgt(sbinfo->si_mntflags);
+	opt_xino = NULL;
+	opt = opts->opt;
+	while (err >= 0 && opt->type != Opt_tail) {
+		err = au_opt_simple(sb, opt, opts);
+
+		/* disable it temporary */
+		dlgt = !!au_opt_test_dlgt(sbinfo->si_mntflags);
+		au_opt_clr(sbinfo->si_mntflags, DLGT);
+
+		if (!err)
+			err = au_opt_br(sb, opt, opts);
+		if (!err)
+			err = au_opt_xino(sb, opt, &opt_xino, opts);
+
+		/* restore it */
+		if (unlikely(dlgt))
+			au_opt_set(sbinfo->si_mntflags, DLGT);
+		opt++;
+	}
+	if (err > 0)
+		err = 0;
+	AuTraceErr(err);
+
+	/* go on even err */
+
+	//todo: test this error case.
+	au_opt_clr(sbinfo->si_mntflags, DLGT);
+	rerr = verify_opts(sb, sbinfo->si_mntflags, /*remount*/1);
+	if (unlikely(dlgt))
+		au_opt_set(sbinfo->si_mntflags, DLGT);
+	if (unlikely(rerr && !err))
+		err = rerr;
+
+	if (unlikely(au_ftest_opts(opts->flags, TRUNC_XIB))) {
+		rerr = au_xib_trunc(sb);
+		if (unlikely(rerr && !err))
+			err = rerr;
+	}
+
+	/* they are handled by the caller */
+	if (!au_ftest_opts(opts->flags, REFRESH_DIR)
+	    && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO)))
+		au_fset_opts(opts->flags, REFRESH_DIR);
+
+	LKTRTrace("status 0x%x\n", opts->flags);
+	AuTraceErr(err);
+	return err;
+}
-- 
1.4.4.4

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