Message-Id: <1211340189-11813-26-git-send-email-hooanon05@yahoo.co.jp>
Date:	Wed, 21 May 2008 12:22:55 +0900
From:	hooanon05@...oo.co.jp
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Junjiro Okajima <hooanon05@...oo.co.jp>
Subject: [AUFS PATCH v2.6.26-rc2-mm1 25/39] aufs inode add operations

From: Junjiro Okajima <hooanon05@...oo.co.jp>

initial commit
inode add operations (mknod/creat/link/mkdir)

Signed-off-by: Junjiro Okajima <hooanon05@...oo.co.jp>
---
 fs/aufs/i_op_add.c |  765 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 765 insertions(+), 0 deletions(-)
 create mode 100644 fs/aufs/i_op_add.c

diff --git a/fs/aufs/i_op_add.c b/fs/aufs/i_op_add.c
new file mode 100644
index 0000000..471a31f
--- /dev/null
+++ b/fs/aufs/i_op_add.c
@@ -0,0 +1,765 @@
+/*
+ * 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
+ */
+
+/*
+ * inode operations (add entry)
+ */
+
+#include "aufs.h"
+
+/*
+ * final procedure of adding a new entry, except link(2).
+ * remove whiteout, instantiate, copyup the parent dir's times and size
+ * and update version.
+ * if it failed, re-create the removed whiteout.
+ */
+static int epilog(struct inode *dir, struct dentry *wh_dentry,
+		  struct dentry *dentry)
+{
+	int err, rerr;
+	aufs_bindex_t bwh;
+	struct inode *inode, *h_dir;
+	struct dentry *wh;
+	struct au_ndx ndx;
+	struct super_block *sb;
+
+	LKTRTrace("wh %p, %.*s\n", wh_dentry, AuDLNPair(dentry));
+
+	bwh = -1;
+	if (wh_dentry) {
+		h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
+		IMustLock(h_dir);
+		bwh = au_dbwh(dentry);
+		err = au_wh_unlink_dentry(h_dir, wh_dentry, dentry, dir,
+					  /*dlgt*/0);
+		if (unlikely(err))
+			goto out;
+	}
+
+	inode = au_new_inode(dentry);
+	if (!IS_ERR(inode)) {
+		d_instantiate(dentry, inode);
+		dir = dentry->d_parent->d_inode; /* dir inode is locked */
+		IMustLock(dir);
+		/* or always cpup dir mtime? */
+		if (au_ibstart(dir) == au_dbstart(dentry))
+			au_cpup_attr_timesizes(dir);
+		dir->i_version++;
+		return 0; /* success */
+	}
+
+	err = PTR_ERR(inode);
+	if (!wh_dentry)
+		goto out;
+
+	/* revert */
+	sb = dentry->d_sb;
+	ndx.flags = 0;
+	if (unlikely(au_opt_test_dlgt(au_mntflags(sb))))
+		au_fset_ndx(ndx.flags, DLGT);
+	ndx.nfsmnt = au_nfsmnt(sb, bwh);
+	ndx.nd = NULL;
+	/* ndx.br = NULL; */
+	/* dir inode is locked */
+	wh = au_wh_create(dir, dentry, bwh, wh_dentry->d_parent, &ndx);
+	rerr = PTR_ERR(wh);
+	if (!IS_ERR(wh)) {
+		dput(wh);
+		goto out;
+	}
+	AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
+		AuDLNPair(dentry), err, rerr);
+	err = -EIO;
+
+ out:
+	AuTraceErr(err);
+	return err;
+}
+
+/*
+ * simple tests for the adding inode operations.
+ * following the checks in vfs, plus the parent-child relationship.
+ */
+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
+	       struct dentry *h_parent, int isdir, struct au_ndx *ndx)
+{
+	int err, exist;
+	struct dentry *h_dentry;
+	struct inode *h_inode;
+	umode_t h_mode;
+
+	LKTRTrace("%.*s/%.*s, b%d, dir %d\n",
+		  AuDLNPair(h_parent), AuDLNPair(dentry), bindex, isdir);
+
+	exist = !!dentry->d_inode;
+	h_dentry = au_h_dptr(dentry, bindex);
+	h_inode = h_dentry->d_inode;
+	if (!exist) {
+		err = -EEXIST;
+		if (unlikely(h_inode))
+			goto out;
+	} else {
+		/* rename(2) case */
+		err = -EIO;
+		if (unlikely(!h_inode || !h_inode->i_nlink))
+			goto out;
+
+		h_mode = h_inode->i_mode;
+		if (!isdir) {
+			err = -EISDIR;
+			if (unlikely(S_ISDIR(h_mode)))
+				goto out;
+		} else if (unlikely(!S_ISDIR(h_mode))) {
+			err = -ENOTDIR;
+			goto out;
+		}
+	}
+
+	err = -EIO;
+	/* expected parent dir is locked */
+	if (unlikely(h_parent != h_dentry->d_parent))
+		goto out;
+	err = 0;
+
+	if (unlikely(au_opt_test(au_mntflags(dentry->d_sb), UDBA_INOTIFY))) {
+		struct dentry *h_latest;
+		struct qstr *qstr = &dentry->d_name;
+
+		err = -EACCES;
+		if (unlikely(au_test_h_perm
+			     (h_parent->d_inode, MAY_EXEC | MAY_WRITE,
+			      au_ftest_ndx(ndx->flags, DLGT))))
+			goto out;
+
+		err = -EIO;
+		h_latest = au_sio_lkup_one(qstr->name, h_parent, qstr->len,
+					   ndx);
+		err = PTR_ERR(h_latest);
+		if (IS_ERR(h_latest))
+			goto out;
+		err = -EIO;
+		dput(h_latest);
+		if (h_latest == h_dentry)
+			err = 0;
+	}
+
+ out:
+	AuTraceErr(err);
+	return err;
+}
+
+/*
+ * initial procedure of adding a new entry.
+ * prepare writable branch and the parent dir, lock it,
+ * lookup whiteout for the new entry.
+ */
+static struct dentry *
+lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
+		  struct dentry *src_dentry, struct au_wr_dir_args *wr_dir_args)
+{
+	struct dentry *wh_dentry, *parent, *h_parent, *gparent;
+	int err;
+	aufs_bindex_t bstart, bcpup;
+	struct inode *dir, *h_dir, *gdir;
+	struct au_ndx ndx;
+	struct super_block *sb;
+	struct au_hinode *hgdir;
+	unsigned int mnt_flags;
+
+	LKTRTrace("%.*s, src %p\n", AuDLNPair(dentry), src_dentry);
+
+	parent = dentry->d_parent; /* dir inode is locked */
+	IMustLock(parent->d_inode);
+	bstart = au_dbstart(dentry);
+	err = au_wr_dir(dentry, src_dentry, wr_dir_args);
+	bcpup = err;
+	wh_dentry = ERR_PTR(err);
+	if (unlikely(err < 0))
+		goto out;
+
+	sb = parent->d_sb;
+	mnt_flags = au_mntflags(sb);
+	/* todo: meaningless lock if CONFIG_AUFS_DEBUG is disabled. */
+	hgdir = NULL;
+	if (unlikely(dt && au_opt_test(mnt_flags, UDBA_INOTIFY)
+		     && !IS_ROOT(parent))) {
+		gparent = dget_parent(parent);
+		gdir = gparent->d_inode;
+		ii_read_lock_parent2(gdir);
+		hgdir = au_hi(gdir, bcpup);
+		ii_read_unlock(gdir);
+		dput(gparent);
+	}
+	dir = parent->d_inode;
+	h_parent = au_h_dptr(parent, bcpup);
+	h_dir = h_parent->d_inode;
+
+	AuDbgSleep_UdbaRace();
+	au_hdir_lock(h_dir, dir, bcpup);
+	/* todo: revalidate the lower dentry? */
+
+	ndx.nfsmnt = au_nfsmnt(sb, bcpup);
+	ndx.flags = 0;
+	if (unlikely(au_opt_test_dlgt(mnt_flags)))
+		au_fset_ndx(ndx.flags, DLGT);
+	ndx.nd = NULL;
+	/* ndx.br = NULL; */
+	/* ndx.nd_file = NULL; */
+
+	if (!au_opt_test(mnt_flags, UDBA_NONE) && au_dbstart(dentry) == bcpup) {
+		struct nameidata nd;
+
+		if (unlikely(ndx.nfsmnt)) {
+			/* todo: dirty? */
+			ndx.nd = &nd;
+			ndx.br = au_sbr(sb, bcpup);
+			memset(&nd, 0, sizeof(nd));
+			nd.flags = LOOKUP_CREATE;
+			nd.intent.open.flags = O_EXCL;
+		}
+		err = au_may_add(dentry, bcpup, h_parent,
+				 au_ftest_wrdir(wr_dir_args->flags, ISDIR),
+				 &ndx);
+		wh_dentry = ERR_PTR(err);
+		if (unlikely(err))
+			goto out_dir;
+		ndx.nd = NULL;
+		ndx.br = NULL;
+	}
+
+	if (dt)
+		au_dtime_store(dt, parent, h_parent, hgdir);
+	wh_dentry = NULL;
+	if (/* bcpup != bstart || */ bcpup != au_dbwh(dentry))
+		goto out; /* success */
+
+	wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, &ndx);
+
+ out_dir:
+	if (IS_ERR(wh_dentry))
+		au_hdir_unlock(h_dir, dir, bcpup);
+ out:
+	AuTraceErrPtr(wh_dentry);
+	return wh_dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+enum { Mknod, Symlink, Creat };
+struct simple_arg {
+	int type;
+	union {
+		struct {
+			int mode;
+			struct nameidata *nd;
+		} c;
+		struct {
+			const char *symname;
+		} s;
+		struct {
+			int mode;
+			dev_t dev;
+		} m;
+	} u;
+};
+
+static int add_simple(struct inode *dir, struct dentry *dentry,
+		      struct simple_arg *arg)
+{
+	int err, dlgt, created;
+	struct dentry *h_dentry, *h_parent, *wh_dentry, *parent;
+	struct inode *h_dir;
+	struct au_dtime dt;
+	struct vfsub_args vargs;
+	struct super_block *sb;
+	aufs_bindex_t bstart;
+	struct au_wr_dir_args wr_dir_args = {
+		.force_btgt	= -1,
+		.flags		= AuWrDir_ADD_ENTRY
+	};
+
+	LKTRTrace("type %d, %.*s\n", arg->type, AuDLNPair(dentry));
+	IMustLock(dir);
+
+	aufs_read_lock(dentry, AuLock_DW);
+	parent = dentry->d_parent; /* dir inode is locked */
+	di_write_lock_parent(parent);
+	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL,
+				      &wr_dir_args);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	bstart = au_dbstart(dentry);
+	h_dentry = au_h_dptr(dentry, bstart);
+	h_parent = h_dentry->d_parent; /* dir inode is locked */
+	h_dir = h_parent->d_inode;
+	IMustLock(h_dir);
+	sb = dir->i_sb;
+	dlgt = !!au_opt_test_dlgt(au_mntflags(sb));
+
+	switch (arg->type) {
+	case Creat:
+		AuDebugOn(au_test_nfs(h_dir->i_sb) && !arg->u.c.nd);
+		err = au_h_create(h_dir, h_dentry, arg->u.c.mode, dlgt,
+				  arg->u.c.nd, au_nfsmnt(sb, bstart));
+		break;
+	case Symlink:
+		err = vfsub_symlink(h_dir, h_dentry, arg->u.s.symname,
+				    S_IALLUGO, dlgt);
+		break;
+	case Mknod:
+		err = vfsub_mknod(h_dir, h_dentry, arg->u.m.mode, arg->u.m.dev,
+				  dlgt);
+		break;
+	default:
+		BUG();
+	}
+	created = !err;
+	if (!err)
+		err = epilog(dir, wh_dentry, dentry);
+
+	/* revert */
+	if (unlikely(created && err && h_dentry->d_inode)) {
+		int rerr;
+		vfsub_args_init(&vargs, NULL, dlgt, 0);
+		rerr = vfsub_unlink(h_dir, h_dentry, &vargs);
+		if (rerr) {
+			AuIOErr("%.*s revert failure(%d, %d)\n",
+				AuDLNPair(dentry), err, rerr);
+			err = -EIO;
+		}
+		/* todo: inotify will be fired to the grand parent dir */
+		au_dtime_revert(&dt);
+		d_drop(dentry);
+	}
+
+	au_hdir_unlock(h_dir, dir, bstart);
+	dput(wh_dentry);
+
+ out:
+	if (unlikely(err)) {
+		au_update_dbstart(dentry);
+		d_drop(dentry);
+	}
+	di_write_unlock(parent);
+	aufs_read_unlock(dentry, AuLock_DW);
+	AuTraceErr(err);
+	return err;
+}
+
+int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+{
+	struct simple_arg arg = {
+		.type = Mknod,
+		.u.m = {
+			.mode	= mode,
+			.dev	= dev
+		}
+	};
+	return add_simple(dir, dentry, &arg);
+}
+
+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+{
+	struct simple_arg arg = {
+		.type = Symlink,
+		.u.s.symname = symname
+	};
+	return add_simple(dir, dentry, &arg);
+}
+
+int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
+		struct nameidata *nd)
+{
+	struct simple_arg arg = {
+		.type = Creat,
+		.u.c = {
+			.mode	= mode,
+			.nd	= nd
+		}
+	};
+	return add_simple(dir, dentry, &arg);
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct link_arg {
+	aufs_bindex_t bdst, bsrc;
+	int issamedir, dlgt;
+	struct dentry *src_parent, *parent, *h_dentry;
+	struct inode *h_dir, *inode, *dir;
+};
+
+static int cpup_before_link(struct dentry *src_dentry, struct inode *dir,
+			    struct link_arg *a)
+{
+	int err;
+	struct inode *hi, *h_dir, *src_dir, *gdir;
+	struct dentry *gparent;
+
+	AuTraceEnter();
+
+	gparent = NULL;
+	gdir = NULL;
+	if (unlikely(au_opt_test(au_mntflags(src_dentry->d_sb), UDBA_INOTIFY)
+		     && !IS_ROOT(a->src_parent))) {
+		gparent = dget_parent(a->src_parent);
+		gdir = gparent->d_inode;
+		if (gdir == dir) {
+			dput(gparent);
+			gparent = NULL;
+		}
+	}
+	src_dir = a->src_parent->d_inode;
+	h_dir = NULL;
+
+	if (!a->issamedir) {
+		/* this temporary unlock/lock is safe */
+		au_hdir_unlock(a->h_dir, dir, a->bdst);
+		di_read_lock_parent2(a->src_parent, AuLock_IR);
+		err = au_test_and_cpup_dirs(src_dentry, a->bdst, a->parent);
+		if (unlikely(err)) {
+			au_hdir_lock(a->h_dir, dir, a->bdst);
+			goto out;
+		}
+
+		/* todo: meaningless lock if CONFIG_AUFS_DEBUG is disabled. */
+		if (unlikely(gparent))
+			ii_read_lock_parent3(gdir);
+		h_dir = au_h_iptr(src_dir, a->bdst);
+		au_hdir_lock(h_dir, src_dir, a->bdst);
+	} else if (unlikely(gparent)) {
+		/* this temporary unlock/lock is safe */
+		au_hdir_unlock(a->h_dir, dir, a->bdst);
+		ii_read_lock_parent3(gdir);
+		au_hdir_lock(a->h_dir, dir, a->bdst);
+	}
+	/* todo: test parent-gparent relationship? */
+
+	AuDebugOn(au_dbstart(src_dentry) != a->bsrc);
+	hi = au_h_dptr(src_dentry, a->bsrc)->d_inode;
+	mutex_lock_nested(&hi->i_mutex, AuLsc_I_CHILD);
+	err = au_sio_cpup_simple(src_dentry, a->bdst, -1, AuCpup_DTIME);
+	mutex_unlock(&hi->i_mutex);
+
+	if (unlikely(gparent)) {
+		ii_read_unlock(gdir);
+		dput(gparent);
+	}
+
+ out:
+	if (h_dir) {
+		au_hdir_unlock(h_dir, src_dir, a->bdst);
+		au_hdir_lock(a->h_dir, dir, a->bdst);
+	}
+	if (!a->issamedir)
+		di_read_unlock(a->src_parent, AuLock_IR);
+
+	AuTraceErr(err);
+	return err;
+}
+
+static int cpup_or_link(struct dentry *src_dentry, struct link_arg *a)
+{
+	int err;
+	struct inode *inode, *h_inode, *h_dst_inode;
+	struct dentry *h_dentry;
+	aufs_bindex_t bstart;
+	struct super_block *sb;
+
+	AuTraceEnter();
+
+	sb = src_dentry->d_sb;
+	inode = src_dentry->d_inode;
+	AuDebugOn(au_dbstart(src_dentry) != a->bsrc);
+	h_dentry = au_h_dptr(src_dentry, a->bsrc);
+	h_inode = h_dentry->d_inode;
+	bstart = au_ibstart(inode);
+	h_dst_inode = NULL;
+	if (bstart <= a->bdst)
+		h_dst_inode = au_h_iptr(inode, a->bdst);
+
+	if (!h_dst_inode || !h_dst_inode->i_nlink) {
+		/* copyup src_dentry as the name of dentry. */
+		au_set_dbstart(src_dentry, a->bdst);
+		au_set_h_dptr(src_dentry, a->bdst, dget(a->h_dentry));
+		mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+		err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc, -1,
+					 !AuCpup_DTIME);
+		mutex_unlock(&h_inode->i_mutex);
+		au_set_h_dptr(src_dentry, a->bdst, NULL);
+		au_set_dbstart(src_dentry, a->bsrc);
+	} else {
+		/* the inode of src_dentry already exists on a.bdst branch */
+		h_dentry = d_find_alias(h_dst_inode);
+		if (h_dentry) {
+			err = vfsub_link(h_dentry, a->h_dir,
+					 a->h_dentry, a->dlgt);
+			dput(h_dentry);
+		} else {
+			AuIOErr("no dentry found for i%lu on b%d\n",
+				h_dst_inode->i_ino, a->bdst);
+			err = -EIO;
+		}
+	}
+
+	if (!err)
+		au_plink_append(sb, a->inode, a->h_dentry, a->bdst);
+
+	AuTraceErr(err);
+	return err;
+}
+
+int aufs_link(struct dentry *src_dentry, struct inode *dir,
+	      struct dentry *dentry)
+{
+	int err, rerr;
+	struct dentry *h_parent, *wh_dentry, *h_src_dentry;
+	struct au_dtime dt;
+	struct link_arg a;
+	struct super_block *sb;
+	unsigned int mnt_flags;
+	struct vfsub_args vargs;
+	struct au_wr_dir_args wr_dir_args = {
+		/* .force_btgt	= -1, */
+		.flags		= AuWrDir_ADD_ENTRY
+	};
+
+	LKTRTrace("src %.*s, i%lu, dst %.*s\n",
+		  AuDLNPair(src_dentry), dir->i_ino, AuDLNPair(dentry));
+	IMustLock(dir);
+	IMustLock(src_dentry->d_inode);
+	AuDebugOn(S_ISDIR(src_dentry->d_inode->i_mode));
+
+	aufs_read_and_write_lock2(dentry, src_dentry, /*flags*/0);
+	sb = dentry->d_sb;
+	a.dir = dir;
+	a.src_parent = dget_parent(src_dentry);
+	a.parent = dentry->d_parent; /* dir inode is locked */
+	a.issamedir = (a.src_parent == a.parent);
+	if (!a.issamedir)
+		au_fset_wrdir(wr_dir_args.flags, LOCK_SRCDIR);
+	wr_dir_args.force_btgt = au_dbstart(src_dentry);
+	di_write_lock_parent(a.parent);
+	wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt);
+	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &wr_dir_args);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	a.inode = src_dentry->d_inode;
+	a.bdst = au_dbstart(dentry);
+	a.h_dentry = au_h_dptr(dentry, a.bdst);
+	h_parent = a.h_dentry->d_parent; /* dir inode is locked */
+	a.h_dir = h_parent->d_inode;
+	IMustLock(a.h_dir);
+
+	err = 0;
+	mnt_flags = au_mntflags(sb);
+	a.dlgt = !!au_opt_test_dlgt(mnt_flags);
+
+	/* todo: minor optimize,
+	   their sb may be same while their bindex differs? */
+	a.bsrc = au_dbstart(src_dentry);
+	h_src_dentry = au_h_dptr(src_dentry, a.bsrc);
+	if (unlikely(!au_opt_test(mnt_flags, PLINK))) {
+		/*
+		 * copyup src_dentry to the branch we process,
+		 * and then link(2) to it.
+		 * gave up 'pseudo link by cpup' approach,
+		 * since nlink may be one and some applications will not work.
+		 */
+		if (a.bdst < a.bsrc
+		    /* && h_src_dentry->d_sb != a.h_dentry->d_sb */)
+			err = cpup_before_link(src_dentry, dir, &a);
+		if (!err) {
+			h_src_dentry = au_h_dptr(src_dentry, a.bdst);
+			err = vfsub_link(h_src_dentry, a.h_dir, a.h_dentry,
+					 a.dlgt);
+		}
+	} else {
+		if (a.bdst < a.bsrc
+		    /* && h_src_dentry->d_sb != a.h_dentry->d_sb */)
+			err = cpup_or_link(src_dentry, &a);
+		else {
+			h_src_dentry = au_h_dptr(src_dentry, a.bdst);
+			err = vfsub_link(h_src_dentry, a.h_dir, a.h_dentry,
+					 a.dlgt);
+		}
+	}
+	if (unlikely(err))
+		goto out_unlock;
+	if (wh_dentry) {
+		err = au_wh_unlink_dentry(a.h_dir, wh_dentry, dentry,
+					  dir, /*dlgt*/0);
+		if (unlikely(err))
+			goto out_revert;
+	}
+
+#if 0 /* cannot support it */
+	/* fuse has different memory inode for the same inode number */
+	if (unlikely(au_test_fuse(a.h_dentry->d_sb))) {
+		LKTRLabel(here);
+		d_drop(a.h_dentry);
+		/*d_drop(h_src_dentry);
+		  d_drop(src_dentry);*/
+		inc_nlink(a.inode);
+		a.inode->i_ctime = dir->i_ctime;
+	}
+#endif
+
+	dir->i_version++;
+	if (au_ibstart(dir) == au_dbstart(dentry))
+		au_cpup_attr_timesizes(dir);
+	if (!d_unhashed(a.h_dentry)
+	    /* || h_old_inode->i_nlink <= nlink */
+	    /* || SB_NFS(h_src_dentry->d_sb) */) {
+		dentry->d_inode = igrab(a.inode);
+		d_instantiate(dentry, a.inode);
+		inc_nlink(a.inode);
+		a.inode->i_ctime = dir->i_ctime;
+	} else
+		/* nfs case (< 2.6.15) */
+		d_drop(dentry);
+	goto out_unlock; /* success */
+
+ out_revert:
+	vfsub_args_init(&vargs, NULL, a.dlgt, 0);
+	rerr = vfsub_unlink(a.h_dir, a.h_dentry, &vargs);
+	if (!rerr)
+		goto out_dt;
+	AuIOErr("%.*s reverting failed(%d, %d)\n",
+		AuDLNPair(dentry), err, rerr);
+	err = -EIO;
+ out_dt:
+	d_drop(dentry);
+	au_dtime_revert(&dt);
+ out_unlock:
+	au_hdir_unlock(a.h_dir, dir, a.bdst);
+	dput(wh_dentry);
+ out:
+	if (unlikely(err)) {
+		au_update_dbstart(dentry);
+		d_drop(dentry);
+	}
+	di_write_unlock(a.parent);
+	dput(a.src_parent);
+	aufs_read_and_write_unlock2(dentry, src_dentry);
+	AuTraceErr(err);
+	return err;
+}
+
+int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	int err, rerr, diropq, dlgt;
+	struct dentry *h_dentry, *h_parent, *wh_dentry, *parent, *opq_dentry;
+	struct inode *h_dir, *h_inode;
+	struct au_dtime dt;
+	aufs_bindex_t bindex;
+	struct super_block *sb;
+	unsigned int mnt_flags;
+	struct vfsub_args vargs;
+	struct au_wr_dir_args wr_dir_args = {
+		.force_btgt	= -1,
+		.flags		= AuWrDir_ADD_ENTRY | AuWrDir_ISDIR
+	};
+
+	LKTRTrace("i%lu, %.*s, mode 0%o\n",
+		  dir->i_ino, AuDLNPair(dentry), mode);
+	IMustLock(dir);
+
+	aufs_read_lock(dentry, AuLock_DW);
+	parent = dentry->d_parent; /* dir inode is locked */
+	di_write_lock_parent(parent);
+	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL,
+				      &wr_dir_args);
+	err = PTR_ERR(wh_dentry);
+	if (IS_ERR(wh_dentry))
+		goto out;
+
+	sb = dentry->d_sb;
+	bindex = au_dbstart(dentry);
+	h_dentry = au_h_dptr(dentry, bindex);
+	h_parent = h_dentry->d_parent; /* dir inode is locked */
+	h_dir = h_parent->d_inode;
+	IMustLock(h_dir);
+	mnt_flags = au_mntflags(sb);
+	dlgt = !!au_opt_test_dlgt(mnt_flags);
+
+	err = vfsub_mkdir(h_dir, h_dentry, mode, dlgt);
+	if (unlikely(err))
+		goto out_unlock;
+	h_inode = h_dentry->d_inode;
+
+	/* make the dir opaque */
+	diropq = 0;
+	if (wh_dentry || au_opt_test(mnt_flags, ALWAYS_DIROPQ)) {
+		mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+		opq_dentry = au_diropq_create(dentry, bindex, /*dlgt*/0);
+		mutex_unlock(&h_inode->i_mutex);
+		err = PTR_ERR(opq_dentry);
+		if (IS_ERR(opq_dentry))
+			goto out_dir;
+		dput(opq_dentry);
+		diropq = 1;
+	}
+
+	err = epilog(dir, wh_dentry, dentry);
+	if (!err) {
+		inc_nlink(dir);
+		goto out_unlock; /* success */
+	}
+
+	/* revert */
+	if (diropq) {
+		LKTRLabel(revert opq);
+		mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+		rerr = au_diropq_remove(dentry, bindex, dlgt);
+		mutex_unlock(&h_inode->i_mutex);
+		if (rerr) {
+			AuIOErr("%.*s reverting diropq failed(%d, %d)\n",
+				AuDLNPair(dentry), err, rerr);
+			err = -EIO;
+		}
+	}
+
+ out_dir:
+	LKTRLabel(revert dir);
+	vfsub_args_init(&vargs, NULL, dlgt, 0);
+	rerr = vfsub_rmdir(h_dir, h_dentry, &vargs);
+	if (rerr) {
+		AuIOErr("%.*s reverting dir failed(%d, %d)\n",
+			AuDLNPair(dentry), err, rerr);
+		err = -EIO;
+	}
+	d_drop(dentry);
+	au_dtime_revert(&dt);
+ out_unlock:
+	au_hdir_unlock(h_dir, dir, bindex);
+	dput(wh_dentry);
+ out:
+	if (unlikely(err)) {
+		au_update_dbstart(dentry);
+		d_drop(dentry);
+	}
+	di_write_unlock(parent);
+	aufs_read_unlock(dentry, AuLock_DW);
+	AuTraceErr(err);
+	return err;
+}
-- 
1.5.5.1.308.g1fbb5.dirty

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