[PATCH 16/19] fs: ubifs: Switch to dcache implementation

[Sascha Hauer <s.hauer@pengutronix.de>]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 fs/ubifs/Kconfig  |   1 -
 fs/ubifs/Makefile |   2 +-
 fs/ubifs/dir.c    | 410 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/ubifs/super.c  | 153 ++------------------
 fs/ubifs/ubifs.c  | 341 +--------------------------------------------
 fs/ubifs/ubifs.h  |   7 +-
 6 files changed, 432 insertions(+), 482 deletions(-)
 create mode 100644 fs/ubifs/dir.c

diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig
index d013ea5780..889a2be97a 100644
--- a/fs/ubifs/Kconfig
+++ b/fs/ubifs/Kconfig
@@ -1,7 +1,6 @@
 menuconfig FS_UBIFS
 	bool
 	depends on MTD_UBI
-	depends on BROKEN
 	prompt "ubifs support"
 
 if FS_UBIFS
diff --git a/fs/ubifs/Makefile b/fs/ubifs/Makefile
index e39ae3b0fd..44ef1b561c 100644
--- a/fs/ubifs/Makefile
+++ b/fs/ubifs/Makefile
@@ -1,4 +1,4 @@
 obj-y += ubifs.o io.o super.o sb.o master.o lpt.o
-obj-y += lpt_commit.o scan.o lprops.o
+obj-y += lpt_commit.o scan.o lprops.o dir.o
 obj-y += tnc.o tnc_misc.o debug.o crc16.o budget.o
 obj-y += log.o orphan.o recovery.o replay.o gc.o
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
new file mode 100644
index 0000000000..e90bdb8348
--- /dev/null
+++ b/fs/ubifs/dir.c
@@ -0,0 +1,410 @@
+/* * This file is part of UBIFS.
+ *
+ * Copyright (C) 2006-2008 Nokia Corporation.
+ * Copyright (C) 2006, 2007 University of Szeged, Hungary
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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
+ *
+ * Authors: Artem Bityutskiy (Битюцкий Артём)
+ *          Adrian Hunter
+ *          Zoltan Sogor
+ */
+
+/*
+ * This file implements directory operations.
+ *
+ * All FS operations in this file allocate budget before writing anything to the
+ * media. If they fail to allocate it, the error is returned. The only
+ * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
+ * if they unable to allocate the budget, because deletion %-ENOSPC failure is
+ * not what users are usually ready to get. UBIFS budgeting subsystem has some
+ * space reserved for these purposes.
+ *
+ * All operations in this file write all inodes which they change straight
+ * away, instead of marking them dirty. For example, 'ubifs_link()' changes
+ * @i_size of the parent inode and writes the parent inode together with the
+ * target inode. This was done to simplify file-system recovery which would
+ * otherwise be very difficult to do. The only exception is rename which marks
+ * the re-named inode dirty (because its @i_ctime is updated) but does not
+ * write it, but just marks it as dirty.
+ */
+
+#include "ubifs.h"
+
+/**
+ * inherit_flags - inherit flags of the parent inode.
+ * @dir: parent inode
+ * @mode: new inode mode flags
+ *
+ * This is a helper function for 'ubifs_new_inode()' which inherits flag of the
+ * parent directory inode @dir. UBIFS inodes inherit the following flags:
+ * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
+ *   sub-directory basis;
+ * o %UBIFS_SYNC_FL - useful for the same reasons;
+ * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
+ *
+ * This function returns the inherited flags.
+ */
+static int inherit_flags(const struct inode *dir, umode_t mode)
+{
+	int flags;
+	const struct ubifs_inode *ui = ubifs_inode(dir);
+
+	if (!S_ISDIR(dir->i_mode))
+		/*
+		 * The parent is not a directory, which means that an extended
+		 * attribute inode is being created. No flags.
+		 */
+		return 0;
+
+	flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
+	if (!S_ISDIR(mode))
+		/* The "DIRSYNC" flag only applies to directories */
+		flags &= ~UBIFS_DIRSYNC_FL;
+	return flags;
+}
+
+/**
+ * ubifs_new_inode - allocate new UBIFS inode object.
+ * @c: UBIFS file-system description object
+ * @dir: parent directory inode
+ * @mode: inode mode flags
+ *
+ * This function finds an unused inode number, allocates new inode and
+ * initializes it. Returns new inode in case of success and an error code in
+ * case of failure.
+ */
+struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
+			      umode_t mode)
+{
+	struct inode *inode;
+	struct ubifs_inode *ui;
+
+	inode = new_inode(c->vfs_sb);
+	ui = ubifs_inode(inode);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	/*
+	 * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
+	 * marking them dirty in file write path (see 'file_update_time()').
+	 * UBIFS has to fully control "clean <-> dirty" transitions of inodes
+	 * to make budgeting work.
+	 */
+	inode->i_flags |= S_NOCMTIME;
+
+	switch (mode & S_IFMT) {
+	case S_IFREG:
+		inode->i_op = &ubifs_file_inode_operations;
+		inode->i_fop = &ubifs_file_operations;
+		break;
+	case S_IFDIR:
+		inode->i_op  = &ubifs_dir_inode_operations;
+		inode->i_fop = &ubifs_dir_operations;
+		inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
+		break;
+	case S_IFLNK:
+		inode->i_op = &ubifs_symlink_inode_operations;
+		break;
+	case S_IFSOCK:
+	case S_IFIFO:
+	case S_IFBLK:
+	case S_IFCHR:
+		inode->i_op  = &ubifs_file_inode_operations;
+		break;
+	default:
+		BUG();
+	}
+
+	ui->flags = inherit_flags(dir, mode);
+	ubifs_set_inode_flags(inode);
+	if (S_ISREG(mode))
+		ui->compr_type = c->default_compr;
+	else
+		ui->compr_type = UBIFS_COMPR_NONE;
+	ui->synced_i_size = 0;
+
+	spin_lock(&c->cnt_lock);
+	/* Inode number overflow is currently not supported */
+	if (c->highest_inum >= INUM_WARN_WATERMARK) {
+		if (c->highest_inum >= INUM_WATERMARK) {
+			spin_unlock(&c->cnt_lock);
+			ubifs_err(c, "out of inode numbers");
+			iput(inode);
+			return ERR_PTR(-EINVAL);
+		}
+		ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
+			   (unsigned long)c->highest_inum, INUM_WATERMARK);
+	}
+
+	inode->i_ino = ++c->highest_inum;
+	/*
+	 * The creation sequence number remains with this inode for its
+	 * lifetime. All nodes for this inode have a greater sequence number,
+	 * and so it is possible to distinguish obsolete nodes belonging to a
+	 * previous incarnation of the same inode number - for example, for the
+	 * purpose of rebuilding the index.
+	 */
+	ui->creat_sqnum = ++c->max_sqnum;
+	spin_unlock(&c->cnt_lock);
+	return inode;
+}
+
+static int dbg_check_name(const struct ubifs_info *c,
+			  const struct ubifs_dent_node *dent,
+			  const struct qstr *nm)
+{
+	if (!dbg_is_chk_gen(c))
+		return 0;
+	if (le16_to_cpu(dent->nlen) != nm->len)
+		return -EINVAL;
+	if (memcmp(dent->name, nm->name, nm->len))
+		return -EINVAL;
+	return 0;
+}
+
+static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
+				   unsigned int flags)
+{
+	int err;
+	union ubifs_key key;
+	struct inode *inode = NULL;
+	struct ubifs_dent_node *dent;
+	struct ubifs_info *c = dir->i_sb->s_fs_info;
+
+	dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
+
+	if (dentry->d_name.len > UBIFS_MAX_NLEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
+	if (!dent)
+		return ERR_PTR(-ENOMEM);
+
+	dent_key_init(c, &key, dir->i_ino, &dentry->d_name);
+
+	err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name);
+	if (err) {
+		if (err == -ENOENT) {
+			dbg_gen("not found");
+			goto done;
+		}
+		goto out;
+	}
+
+	if (dbg_check_name(c, dent, &dentry->d_name)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
+	if (IS_ERR(inode)) {
+		/*
+		 * This should not happen. Probably the file-system needs
+		 * checking.
+		 */
+		err = PTR_ERR(inode);
+		ubifs_err(c, "dead directory entry '%pd', error %d",
+			dentry, err);
+		ubifs_ro_mode(c, err);
+		goto out;
+	}
+
+done:
+	kfree(dent);
+	/*
+	 * Note, d_splice_alias() would be required instead if we supported
+	 * NFS.
+	 */
+	d_add(dentry, inode);
+	return NULL;
+
+out:
+	kfree(dent);
+	return ERR_PTR(err);
+}
+
+/**
+ * vfs_dent_type - get VFS directory entry type.
+ * @type: UBIFS directory entry type
+ *
+ * This function converts UBIFS directory entry type into VFS directory entry
+ * type.
+ */
+static unsigned int vfs_dent_type(uint8_t type)
+{
+	switch (type) {
+	case UBIFS_ITYPE_REG:
+		return DT_REG;
+	case UBIFS_ITYPE_DIR:
+		return DT_DIR;
+	case UBIFS_ITYPE_LNK:
+		return DT_LNK;
+	case UBIFS_ITYPE_BLK:
+		return DT_BLK;
+	case UBIFS_ITYPE_CHR:
+		return DT_CHR;
+	case UBIFS_ITYPE_FIFO:
+		return DT_FIFO;
+	case UBIFS_ITYPE_SOCK:
+		return DT_SOCK;
+	default:
+		BUG();
+	}
+	return 0;
+}
+
+/*
+ * The classical Unix view for directory is that it is a linear array of
+ * (name, inode number) entries. Linux/VFS assumes this model as well.
+ * Particularly, 'readdir()' call wants us to return a directory entry offset
+ * which later may be used to continue 'readdir()'ing the directory or to
+ * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
+ * model because directory entries are identified by keys, which may collide.
+ *
+ * UBIFS uses directory entry hash value for directory offsets, so
+ * 'seekdir()'/'telldir()' may not always work because of possible key
+ * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
+ * properly by means of saving full directory entry name in the private field
+ * of the file description object.
+ *
+ * This means that UBIFS cannot support NFS which requires full
+ * 'seekdir()'/'telldir()' support.
+ */
+static int ubifs_readdir(struct file *file, struct dir_context *ctx)
+{
+	int err = 0;
+	struct qstr nm;
+	union ubifs_key key;
+	struct ubifs_dent_node *dent;
+	struct dentry *dentry = file->f_path.dentry;
+	struct inode *dir = d_inode(dentry);
+	struct ubifs_info *c = dir->i_sb->s_fs_info;
+
+	dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
+
+	if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
+		/*
+		 * The directory was seek'ed to a senseless position or there
+		 * are no more entries.
+		 */
+		return 0;
+
+	if (file->f_version == 0) {
+		/*
+		 * The file was seek'ed, which means that @file->private_data
+		 * is now invalid. This may also be just the first
+		 * 'ubifs_readdir()' invocation, in which case
+		 * @file->private_data is NULL, and the below code is
+		 * basically a no-op.
+		 */
+		kfree(file->private_data);
+		file->private_data = NULL;
+	}
+
+	/*
+	 * 'generic_file_llseek()' unconditionally sets @file->f_version to
+	 * zero, and we use this for detecting whether the file was seek'ed.
+	 */
+	file->f_version = 1;
+
+	/* File positions 0 and 1 correspond to "." and ".." */
+	if (ctx->pos < 2) {
+		ubifs_assert(!file->private_data);
+		dir_emit_dots(file, ctx);
+
+		/* Find the first entry in TNC and save it */
+		lowest_dent_key(c, &key, dir->i_ino);
+		nm.name = NULL;
+		dent = ubifs_tnc_next_ent(c, &key, &nm);
+		if (IS_ERR(dent)) {
+			err = PTR_ERR(dent);
+			goto out;
+		}
+
+		ctx->pos = key_hash_flash(c, &dent->key);
+		file->private_data = dent;
+	}
+
+	dent = file->private_data;
+	if (!dent) {
+		/*
+		 * The directory was seek'ed to and is now readdir'ed.
+		 * Find the entry corresponding to @ctx->pos or the closest one.
+		 */
+		dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
+		nm.name = NULL;
+		dent = ubifs_tnc_next_ent(c, &key, &nm);
+		if (IS_ERR(dent)) {
+			err = PTR_ERR(dent);
+			goto out;
+		}
+		ctx->pos = key_hash_flash(c, &dent->key);
+		file->private_data = dent;
+	}
+
+	while (1) {
+		dbg_gen("feed '%s', ino %llu, new f_pos %#x",
+			dent->name, (unsigned long long)le64_to_cpu(dent->inum),
+			key_hash_flash(c, &dent->key));
+		ubifs_assert(le64_to_cpu(dent->ch.sqnum) >
+			     ubifs_inode(dir)->creat_sqnum);
+
+		nm.len = le16_to_cpu(dent->nlen);
+		dir_emit(ctx, dent->name, nm.len,
+			       le64_to_cpu(dent->inum),
+			       vfs_dent_type(dent->type));
+
+		/* Switch to the next entry */
+		key_read(c, &dent->key, &key);
+		nm.name = dent->name;
+		dent = ubifs_tnc_next_ent(c, &key, &nm);
+		if (IS_ERR(dent)) {
+			err = PTR_ERR(dent);
+			goto out;
+		}
+
+		kfree(file->private_data);
+		ctx->pos = key_hash_flash(c, &dent->key);
+		file->private_data = dent;
+		cond_resched();
+	}
+
+out:
+	kfree(file->private_data);
+	file->private_data = NULL;
+
+	if (err != -ENOENT)
+		ubifs_err(c, "cannot find next direntry, error %d", err);
+	else
+		/*
+		 * -ENOENT is a non-fatal error in this context, the TNC uses
+		 * it to indicate that the cursor moved past the current directory
+		 * and readdir() has to stop.
+		 */
+		err = 0;
+
+
+	/* 2 is a special value indicating that there are no more direntries */
+	ctx->pos = 2;
+	return err;
+}
+
+const struct inode_operations ubifs_dir_inode_operations = {
+	.lookup      = ubifs_lookup,
+};
+
+const struct file_operations ubifs_dir_operations = {
+	.iterate        = ubifs_readdir,
+};
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index b4eb76202b..abf8ef63c9 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -30,6 +30,7 @@
 
 #include <common.h>
 #include <init.h>
+#include <fs.h>
 #include <malloc.h>
 #include <linux/bug.h>
 #include <linux/log2.h>
@@ -49,8 +50,6 @@ struct vfsmount;
 struct super_block *ubifs_sb;
 LIST_HEAD(super_blocks);
 
-static struct inode *inodes_locked_down[INODE_LOCKED_MAX];
-
 int set_anon_super(struct super_block *s, void *data)
 {
 	return 0;
@@ -84,39 +83,6 @@ int ubifs_iput(struct inode *inode)
 	return 0;
 }
 
-/*
- * Lock (save) inode in inode array for readback after recovery
- */
-void iput(struct inode *inode)
-{
-	int i;
-	struct inode *ino;
-
-	/*
-	 * Search end of list
-	 */
-	for (i = 0; i < INODE_LOCKED_MAX; i++) {
-		if (inodes_locked_down[i] == NULL)
-			break;
-	}
-
-	if (i >= INODE_LOCKED_MAX) {
-		dbg_gen("Error, can't lock (save) more inodes while recovery!!!");
-		return;
-	}
-
-	/*
-	 * Allocate and use new inode
-	 */
-	ino = (struct inode *)kzalloc(sizeof(struct ubifs_inode), 0);
-	memcpy(ino, inode, sizeof(struct ubifs_inode));
-
-	/*
-	 * Finally save inode in array
-	 */
-	inodes_locked_down[i] = ino;
-}
-
 /* from fs/inode.c */
 /**
  * clear_nlink - directly zero an inode's link count
@@ -231,6 +197,9 @@ static int validate_inode(struct ubifs_info *c, const struct inode *inode)
 	return err;
 }
 
+const struct inode_operations ubifs_file_inode_operations;
+const struct file_operations ubifs_file_operations;
+
 struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
 {
 	int err;
@@ -239,35 +208,9 @@ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
 	struct ubifs_info *c = sb->s_fs_info;
 	struct inode *inode;
 	struct ubifs_inode *ui;
-#ifdef __BAREBOX__
-	int i;
-#endif
 
 	dbg_gen("inode %lu", inum);
 
-#ifdef __BAREBOX__
-	/*
-	 * U-Boot special handling of locked down inodes via recovery
-	 * e.g. ubifs_recover_size()
-	 */
-	for (i = 0; i < INODE_LOCKED_MAX; i++) {
-		/*
-		 * Exit on last entry (NULL), inode not found in list
-		 */
-		if (inodes_locked_down[i] == NULL)
-			break;
-
-		if (inodes_locked_down[i]->i_ino == inum) {
-			/*
-			 * We found the locked down inode in our array,
-			 * so just return this pointer instead of creating
-			 * a new one.
-			 */
-			return inodes_locked_down[i];
-		}
-	}
-#endif
-
 	inode = iget_locked(sb, inum);
 	if (!inode)
 		return ERR_PTR(-ENOMEM);
@@ -315,10 +258,8 @@ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
 	if (err)
 		goto out_invalid;
 
-#ifndef __BAREBOX__
 	switch (inode->i_mode & S_IFMT) {
 	case S_IFREG:
-		inode->i_mapping->a_ops = &ubifs_file_address_operations;
 		inode->i_op = &ubifs_file_inode_operations;
 		inode->i_fop = &ubifs_file_operations;
 		if (ui->xattr) {
@@ -343,7 +284,7 @@ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
 		}
 		break;
 	case S_IFLNK:
-		inode->i_op = &ubifs_symlink_inode_operations;
+		inode->i_op = &simple_symlink_inode_operations;
 		if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
 			err = 12;
 			goto out_invalid;
@@ -357,60 +298,10 @@ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
 		((char *)ui->data)[ui->data_len] = '\0';
 		inode->i_link = ui->data;
 		break;
-	case S_IFBLK:
-	case S_IFCHR:
-	{
-		dev_t rdev;
-		union ubifs_dev_desc *dev;
-
-		ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
-		if (!ui->data) {
-			err = -ENOMEM;
-			goto out_ino;
-		}
-
-		dev = (union ubifs_dev_desc *)ino->data;
-		if (ui->data_len == sizeof(dev->new))
-			rdev = new_decode_dev(le32_to_cpu(dev->new));
-		else if (ui->data_len == sizeof(dev->huge))
-			rdev = huge_decode_dev(le64_to_cpu(dev->huge));
-		else {
-			err = 13;
-			goto out_invalid;
-		}
-		memcpy(ui->data, ino->data, ui->data_len);
-		inode->i_op = &ubifs_file_inode_operations;
-		init_special_inode(inode, inode->i_mode, rdev);
-		break;
-	}
-	case S_IFSOCK:
-	case S_IFIFO:
-		inode->i_op = &ubifs_file_inode_operations;
-		init_special_inode(inode, inode->i_mode, 0);
-		if (ui->data_len != 0) {
-			err = 14;
-			goto out_invalid;
-		}
-		break;
 	default:
 		err = 15;
 		goto out_invalid;
 	}
-#else
-	if ((inode->i_mode & S_IFMT) == S_IFLNK) {
-		if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
-			err = 12;
-			goto out_invalid;
-		}
-		ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
-		if (!ui->data) {
-			err = -ENOMEM;
-			goto out_ino;
-		}
-		memcpy(ui->data, ino->data, ui->data_len);
-		((char *)ui->data)[ui->data_len] = '\0';
-	}
-#endif
 
 	kfree(ino);
 #ifndef __BAREBOX__
@@ -447,22 +338,15 @@ static struct inode *ubifs_alloc_inode(struct super_block *sb)
 	return &ui->vfs_inode;
 };
 
-#ifndef __BAREBOX__
-static void ubifs_i_callback(struct rcu_head *head)
-{
-	struct inode *inode = container_of(head, struct inode, i_rcu);
-	struct ubifs_inode *ui = ubifs_inode(inode);
-	kmem_cache_free(ubifs_inode_slab, ui);
-}
-
 static void ubifs_destroy_inode(struct inode *inode)
 {
 	struct ubifs_inode *ui = ubifs_inode(inode);
 
 	kfree(ui->data);
-	call_rcu(&inode->i_rcu, ubifs_i_callback);
+	kfree(ui);
 }
 
+#ifndef __BAREBOX__
 /*
  * Note, Linux write-back code calls this without 'i_mutex'.
  */
@@ -1330,15 +1214,9 @@ static int mount_ubifs(struct ubifs_info *c)
 	long long x, y;
 	size_t sz;
 
-	c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
+	c->ro_mount = true;
 	/* Suppress error messages while probing if MS_SILENT is set */
 	c->probing = !!(c->vfs_sb->s_flags & MS_SILENT);
-#ifdef __BAREBOX__
-	if (!c->ro_mount) {
-		printf("UBIFS: only ro mode in Barebox allowed.\n");
-		return -EACCES;
-	}
-#endif
 
 	err = init_constants_early(c);
 	if (err)
@@ -2099,8 +1977,8 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
 
 const struct super_operations ubifs_super_operations = {
 	.alloc_inode   = ubifs_alloc_inode,
-#ifndef __BAREBOX__
 	.destroy_inode = ubifs_destroy_inode,
+#ifndef __BAREBOX__
 	.put_super     = ubifs_put_super,
 	.write_inode   = ubifs_write_inode,
 	.evict_inode   = ubifs_evict_inode,
@@ -2298,15 +2176,11 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
 		goto out_umount;
 	}
 
-#ifndef __BAREBOX__
 	sb->s_root = d_make_root(root);
 	if (!sb->s_root) {
 		err = -ENOMEM;
 		goto out_umount;
 	}
-#else
-	sb->s_root = NULL;
-#endif
 
 	mutex_unlock(&c->umount_mutex);
 	return 0;
@@ -2680,13 +2554,14 @@ MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
 MODULE_DESCRIPTION("UBIFS - UBI File System");
 #endif
 
-struct super_block *ubifs_get_super(struct device_d *dev, struct ubi_volume_desc *ubi, int silent)
+int ubifs_get_super(struct device_d *dev, struct ubi_volume_desc *ubi, int silent)
 {
+	struct fs_device_d *fsdev = dev_to_fs_device(dev);
 	struct super_block *sb;
 	struct ubifs_info *c;
 	int err;
 
-	sb = alloc_super(NULL, MS_RDONLY | MS_ACTIVE | MS_NOATIME);
+	sb = &fsdev->sb;
 	c = alloc_ubifs_info(ubi);
 
 	c->dev = dev;
@@ -2712,9 +2587,9 @@ struct super_block *ubifs_get_super(struct device_d *dev, struct ubi_volume_desc
 		goto out;
 	}
 
-	return sb;
+	return 0;
 out:
 	kfree(c);
 	kfree(sb);
-	return ERR_PTR(err);
+	return err;
 }
diff --git a/fs/ubifs/ubifs.c b/fs/ubifs/ubifs.c
index a525b044b8..f9b4f4babc 100644
--- a/fs/ubifs/ubifs.c
+++ b/fs/ubifs/ubifs.c
@@ -269,161 +269,6 @@ int __init ubifs_compressors_init(void)
 	return 0;
 }
 
-/*
- * ubifsls...
- */
-
-static int ubifs_finddir(struct super_block *sb, char *dirname,
-			 unsigned long root_inum, unsigned long *inum)
-{
-	int err;
-	struct qstr nm;
-	union ubifs_key key;
-	struct ubifs_dent_node *dent;
-	struct ubifs_info *c;
-	struct file *file;
-	struct dentry *dentry;
-	struct inode *dir;
-	int ret = 0;
-
-	file = kzalloc(sizeof(struct file), 0);
-	dentry = kzalloc(sizeof(struct dentry), 0);
-	dir = kzalloc(sizeof(struct inode), 0);
-	if (!file || !dentry || !dir) {
-		printf("%s: Error, no memory for malloc!\n", __func__);
-		err = -ENOMEM;
-		goto out;
-	}
-
-	dir->i_sb = sb;
-	file->f_path.dentry = dentry;
-	file->f_path.dentry->d_parent = dentry;
-	file->f_path.dentry->d_inode = dir;
-	file->f_path.dentry->d_inode->i_ino = root_inum;
-	c = sb->s_fs_info;
-
-	dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);
-
-	/* Find the first entry in TNC and save it */
-	lowest_dent_key(c, &key, dir->i_ino);
-	nm.name = NULL;
-	dent = ubifs_tnc_next_ent(c, &key, &nm);
-	if (IS_ERR(dent)) {
-		err = PTR_ERR(dent);
-		goto out;
-	}
-
-	file->f_pos = key_hash_flash(c, &dent->key);
-	file->private_data = dent;
-
-	while (1) {
-		dbg_gen("feed '%s', ino %llu, new f_pos %#x",
-			dent->name, (unsigned long long)le64_to_cpu(dent->inum),
-			key_hash_flash(c, &dent->key));
-		ubifs_assert(le64_to_cpu(dent->ch.sqnum) > ubifs_inode(dir)->creat_sqnum);
-
-		nm.len = le16_to_cpu(dent->nlen);
-		if ((strncmp(dirname, (char *)dent->name, nm.len) == 0) &&
-		    (strlen(dirname) == nm.len)) {
-			*inum = le64_to_cpu(dent->inum);
-			ret = 1;
-			goto out_free;
-		}
-
-		/* Switch to the next entry */
-		key_read(c, &dent->key, &key);
-		nm.name = (char *)dent->name;
-		dent = ubifs_tnc_next_ent(c, &key, &nm);
-		if (IS_ERR(dent)) {
-			err = PTR_ERR(dent);
-			goto out;
-		}
-
-		kfree(file->private_data);
-		file->f_pos = key_hash_flash(c, &dent->key);
-		file->private_data = dent;
-		cond_resched();
-	}
-
-out:
-	if (err != -ENOENT)
-		dbg_gen("cannot find next direntry, error %d", err);
-
-out_free:
-	if (file->private_data)
-		kfree(file->private_data);
-	if (file)
-		free(file);
-	if (dentry)
-		free(dentry);
-	if (dir)
-		free(dir);
-
-	return ret;
-}
-
-static unsigned long ubifs_findfile(struct super_block *sb, const char *filename)
-{
-	int ret;
-	char *next;
-	char fpath[128];
-	char *name = fpath;
-	unsigned long root_inum = 1;
-	unsigned long inum;
-
-	strcpy(fpath, filename);
-
-	/* Remove all leading slashes */
-	while (*name == '/')
-		name++;
-
-	/*
-	 * Handle root-direcoty ('/')
-	 */
-	inum = root_inum;
-	if (!name || *name == '\0')
-		return inum;
-
-	for (;;) {
-		struct inode *inode;
-		struct ubifs_inode *ui;
-
-		/* Extract the actual part from the pathname.  */
-		next = strchr(name, '/');
-		if (next) {
-			/* Remove all leading slashes.  */
-			while (*next == '/')
-				*(next++) = '\0';
-		}
-
-		ret = ubifs_finddir(sb, name, root_inum, &inum);
-		if (!ret)
-			return 0;
-		inode = ubifs_iget(sb, inum);
-
-		if (IS_ERR(inode))
-			return 0;
-		ui = ubifs_inode(inode);
-
-		/*
-		 * Check if directory with this name exists
-		 */
-
-		/* Found the node!  */
-		if (!next || *next == '\0')
-			return inum;
-
-		root_inum = inum;
-		name = next;
-	}
-
-	return 0;
-}
-
-/*
- * ubifsload...
- */
-
 /* file.c */
 
 static inline void *kmap(struct page *page)
@@ -487,18 +332,8 @@ struct ubifs_file {
 
 static int ubifs_open(struct device_d *dev, FILE *file, const char *filename)
 {
-	struct ubifs_priv *priv = dev->priv;
-	struct inode *inode;
+	struct inode *inode = file->f_inode;
 	struct ubifs_file *uf;
-	unsigned long inum;
-
-	inum = ubifs_findfile(priv->sb, filename);
-	if (!inum)
-		return -ENOENT;
-
-	inode = ubifs_iget(priv->sb, inum);
-	if (IS_ERR(inode))
-		return -ENOENT;
 
 	uf = xzalloc(sizeof(*uf));
 
@@ -516,9 +351,6 @@ static int ubifs_open(struct device_d *dev, FILE *file, const char *filename)
 static int ubifs_close(struct device_d *dev, FILE *f)
 {
 	struct ubifs_file *uf = f->priv;
-	struct inode *inode = uf->inode;
-
-	ubifs_iput(inode);
 
 	free(uf->buf);
 	free(uf->dn);
@@ -596,163 +428,6 @@ static loff_t ubifs_lseek(struct device_d *dev, FILE *f, loff_t pos)
 	return pos;
 }
 
-struct ubifs_dir {
-	struct file file;
-	struct dentry dentry;
-	struct inode inode;
-	DIR dir;
-	union ubifs_key key;
-	struct ubifs_dent_node *dent;
-	struct ubifs_priv *priv;
-	struct qstr nm;
-};
-
-static DIR *ubifs_opendir(struct device_d *dev, const char *pathname)
-{
-	struct ubifs_priv *priv = dev->priv;
-	struct ubifs_dir *dir;
-	struct file *file;
-	struct dentry *dentry;
-	struct inode *inode;
-	unsigned long inum;
-	struct ubifs_info *c = priv->sb->s_fs_info;
-
-	inum = ubifs_findfile(priv->sb, pathname);
-	if (!inum)
-		return NULL;
-
-	inode = ubifs_iget(priv->sb, inum);
-	if (IS_ERR(inode))
-		return NULL;
-
-	ubifs_iput(inode);
-
-	dir = xzalloc(sizeof(*dir));
-
-	dir->priv = priv;
-
-	file = &dir->file;
-	dentry = &dir->dentry;
-	inode = &dir->inode;
-
-	inode->i_sb = priv->sb;
-	file->f_path.dentry = dentry;
-	file->f_path.dentry->d_parent = dentry;
-	file->f_path.dentry->d_inode = inode;
-	file->f_path.dentry->d_inode->i_ino = inum;
-	file->f_pos = 1;
-
-	/* Find the first entry in TNC and save it */
-	lowest_dent_key(c, &dir->key, inode->i_ino);
-
-	return &dir->dir;
-}
-
-static struct dirent *ubifs_readdir(struct device_d *dev, DIR *_dir)
-{
-	struct ubifs_dir *dir = container_of(_dir, struct ubifs_dir, dir);
-	struct ubifs_info *c = dir->priv->sb->s_fs_info;
-	struct ubifs_dent_node *dent;
-	struct qstr *nm = &dir->nm;
-	struct file *file = &dir->file;
-
-	dent = ubifs_tnc_next_ent(c, &dir->key, nm);
-	if (IS_ERR(dent))
-		return NULL;
-
-	debug("feed '%s', ino %llu, new f_pos %#x\n",
-		dent->name, (unsigned long long)le64_to_cpu(dent->inum),
-		key_hash_flash(c, &dent->key));
-
-	ubifs_assert(le64_to_cpu(dent->ch.sqnum) > ubifs_inode(&dir->inode)->creat_sqnum);
-
-	key_read(c, &dent->key, &dir->key);
-	file->f_pos = key_hash_flash(c, &dent->key);
-	file->private_data = dent;
-
-	nm->len = le16_to_cpu(dent->nlen);
-	nm->name = dent->name;
-
-	strcpy(_dir->d.d_name, dent->name);
-
-	free(dir->dent);
-	dir->dent = dent;
-
-	return &_dir->d;
-}
-
-static int ubifs_closedir(struct device_d *dev, DIR *_dir)
-{
-	struct ubifs_dir *dir = container_of(_dir, struct ubifs_dir, dir);
-
-	free(dir->dent);
-	free(dir);
-
-	return 0;
-}
-
-static int ubifs_stat(struct device_d *dev, const char *filename, struct stat *s)
-{
-	struct ubifs_priv *priv = dev->priv;
-	struct inode *inode;
-	unsigned long inum;
-
-	inum = ubifs_findfile(priv->sb, filename);
-	if (!inum)
-		return -ENOENT;
-
-	inode = ubifs_iget(priv->sb, inum);
-	if (IS_ERR(inode))
-		return -ENOENT;
-
-	s->st_size = inode->i_size;
-	s->st_mode = inode->i_mode;
-
-	ubifs_iput(inode);
-
-	return 0;
-}
-
-static char *ubifs_symlink(struct inode *inode)
-{
-	struct ubifs_inode *ui;
-	char *symlink;
-
-	ui = ubifs_inode(inode);
-	symlink = malloc(ui->data_len + 1);
-
-	memcpy(symlink, ui->data, ui->data_len);
-	symlink[ui->data_len] = '\0';
-
-	return symlink;
-}
-
-static int ubifs_readlink(struct device_d *dev, const char *pathname, char *buf,
-			size_t bufsz)
-{
-	struct ubifs_priv *priv = dev->priv;
-	struct inode *inode;
-	char *symlink;
-	int len;
-	unsigned long inum;
-
-	inum = ubifs_findfile(priv->sb, pathname);
-	if (!inum)
-		return -ENOENT;
-
-	inode = ubifs_iget(priv->sb, inum);
-	if (!inode)
-		return -ENOENT;
-
-	symlink = ubifs_symlink(inode);
-
-	len = min(bufsz, strlen(symlink));
-	memcpy(buf, symlink, len);
-	free(symlink);
-
-	return 0;
-}
-
 void ubifs_set_rootarg(struct ubifs_priv *priv, struct fs_device_d *fsdev)
 {
 	struct ubi_volume_info vi = {};
@@ -795,11 +470,11 @@ static int ubifs_probe(struct device_d *dev)
 		goto err_free;
 	}
 
-	priv->sb = ubifs_get_super(dev, priv->ubi, 0);
-	if (IS_ERR(priv->sb)) {
-		ret = PTR_ERR(priv->sb);
+	ret = ubifs_get_super(dev, priv->ubi, 0);
+	if (ret)
 		goto err;
-	}
+
+	priv->sb = &fsdev->sb;
 
 	ubifs_set_rootarg(priv, fsdev);
 
@@ -821,7 +496,6 @@ static void ubifs_remove(struct device_d *dev)
 	ubi_close_volume(priv->ubi);
 
 	free(c);
-	free(sb);
 
 	free(priv);
 }
@@ -831,11 +505,6 @@ static struct fs_driver_d ubifs_driver = {
 	.close     = ubifs_close,
 	.read      = ubifs_read,
 	.lseek     = ubifs_lseek,
-	.opendir   = ubifs_opendir,
-	.readdir   = ubifs_readdir,
-	.closedir  = ubifs_closedir,
-	.stat      = ubifs_stat,
-	.readlink  = ubifs_readlink,
 	.type = filetype_ubifs,
 	.flags     = 0,
 	.drv = {
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 22b24a1161..4c4c927de9 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -36,6 +36,7 @@
 #include <lzo.h>
 #include <crc.h>
 #include <linux/fs.h>
+#include <linux/stat.h>
 #include <linux/sched.h>
 #include <linux/ctype.h>
 #include <linux/time.h>
@@ -49,11 +50,9 @@
 
 #define crc32(seed, data, length)  crc32_no_comp(seed, (unsigned char const *)data, length)
 
-struct dentry;
 struct file;
 struct iattr;
 struct kstat;
-struct vfsmount;
 
 extern struct super_block *ubifs_sb;
 
@@ -72,8 +71,6 @@ struct page {
 	struct inode *inode;
 };
 
-void iput(struct inode *inode);
-
 struct kmem_cache { int sz; };
 
 struct kmem_cache *get_mem(int element_sz);
@@ -1901,7 +1898,7 @@ int ubifs_decompress(const struct ubifs_info *c, const void *buf, int len,
 
 #ifdef __BAREBOX__
 void ubifs_umount(struct ubifs_info *c);
-struct super_block *ubifs_get_super(struct device_d *dev, struct ubi_volume_desc *ubi, int silent);
+int ubifs_get_super(struct device_d *dev, struct ubi_volume_desc *ubi, int silent);
 #endif
 
 #endif /* !__UBIFS_H__ */
-- 
2.16.1


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