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From: Zhihao Cheng <chengzhihao1@huawei.com>
To: <richard@nod.at>, <david.oberhollenzer@sigma-star.at>,
	<miquel.raynal@bootlin.com>, <yi.zhang@huawei.com>, <xiangyang3@huawei.com>,
	<huangxiaojia2@huawei.com>
CC: <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Subject: [RFC PATCH mtd-utils 035/110] ubifs-utils: Adapt super.c in libubifs
Date: Fri, 7 Jun 2024 12:25:00 +0800
Message-ID: <20240607042615.2069840-36-chengzhihao1@huawei.com>
In-Reply-To: <20240607042615.2069840-1-chengzhihao1@huawei.com>
References: <20240607042615.2069840-1-chengzhihao1@huawei.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
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Adapt super.c in libubifs, compared with linux kernel implementations:
 1. It contains all definitions in common/super.c(Message printing
    functions are replaced with linux kernel styles).
 2. Remove some functions(eg. ubifs_iget, ubifs_dirty_inode) which won't
    be used in fsck/mkfs.
 3. Remove unused variables initialization in some functions(eg.
    init_constants_early, init_constants_sb).

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
---
 ubifs-utils/libubifs/super.c | 2219 ++++--------------------------------------
 1 file changed, 177 insertions(+), 2042 deletions(-)

diff --git a/ubifs-utils/libubifs/super.c b/ubifs-utils/libubifs/super.c
index 09e270d6..1cbbfcac 100644
--- a/ubifs-utils/libubifs/super.c
+++ b/ubifs-utils/libubifs/super.c
@@ -14,487 +14,190 @@
  * corresponding subsystems, but most of it is here.
  */
 
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/ctype.h>
-#include <linux/kthread.h>
-#include <linux/parser.h>
-#include <linux/seq_file.h>
-#include <linux/mount.h>
-#include <linux/math64.h>
-#include <linux/writeback.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "linux_err.h"
+#include "bitops.h"
+#include "kmem.h"
 #include "ubifs.h"
+#include "defs.h"
+#include "debug.h"
+#include "key.h"
+#include "misc.h"
 
-static int ubifs_default_version_set(const char *val, const struct kernel_param *kp)
-{
-	int n = 0, ret;
-
-	ret = kstrtoint(val, 10, &n);
-	if (ret != 0 || n < 4 || n > UBIFS_FORMAT_VERSION)
-		return -EINVAL;
-	return param_set_int(val, kp);
-}
-
-static const struct kernel_param_ops ubifs_default_version_ops = {
-	.set = ubifs_default_version_set,
-	.get = param_get_int,
-};
-
-int ubifs_default_version = UBIFS_FORMAT_VERSION;
-module_param_cb(default_version, &ubifs_default_version_ops, &ubifs_default_version, 0600);
-
-/*
- * Maximum amount of memory we may 'kmalloc()' without worrying that we are
- * allocating too much.
- */
-#define UBIFS_KMALLOC_OK (128*1024)
-
-/* Slab cache for UBIFS inodes */
-static struct kmem_cache *ubifs_inode_slab;
-
-/* UBIFS TNC shrinker description */
-static struct shrinker *ubifs_shrinker_info;
+atomic_long_t ubifs_clean_zn_cnt;
+static const int default_debug_level = WARN_LEVEL;
 
 /**
- * validate_inode - validate inode.
- * @c: UBIFS file-system description object
- * @inode: the inode to validate
+ * open_ubi - open the libubi.
+ * @c: the UBIFS file-system description object
+ * @node: name of the UBI volume character device to fetch information about
  *
- * This is a helper function for 'ubifs_iget()' which validates various fields
- * of a newly built inode to make sure they contain sane values and prevent
- * possible vulnerabilities. Returns zero if the inode is all right and
- * a non-zero error code if not.
+ * This function opens libubi, and initialize device & volume information
+ * according to @node. Returns %0 in case of success and %-1 in case of failure.
  */
-static int validate_inode(struct ubifs_info *c, const struct inode *inode)
+int open_ubi(struct ubifs_info *c, const char *node)
 {
-	int err;
-	const struct ubifs_inode *ui = ubifs_inode(inode);
-
-	if (inode->i_size > c->max_inode_sz) {
-		ubifs_err(c, "inode is too large (%lld)",
-			  (long long)inode->i_size);
-		return 1;
-	}
-
-	if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
-		ubifs_err(c, "unknown compression type %d", ui->compr_type);
-		return 2;
-	}
-
-	if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
-		return 3;
+	struct stat st;
 
-	if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
-		return 4;
+	if (stat(node, &st) || !S_ISCHR(st.st_mode))
+		return -1;
 
-	if (ui->xattr && !S_ISREG(inode->i_mode))
-		return 5;
+	c->libubi = libubi_open();
+	if (!c->libubi)
+		return -1;
+	if (ubi_get_vol_info(c->libubi, node, &c->vi))
+		goto out_err;
+	if (ubi_get_dev_info1(c->libubi, c->vi.dev_num, &c->di))
+		goto out_err;
 
-	if (!ubifs_compr_present(c, ui->compr_type)) {
-		ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in",
-			   inode->i_ino, ubifs_compr_name(c, ui->compr_type));
-	}
+	return 0;
 
-	err = dbg_check_dir(c, inode);
-	return err;
+out_err:
+	close_ubi(c);
+	return -1;
 }
 
-struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
+void close_ubi(struct ubifs_info *c)
 {
-	int err;
-	union ubifs_key key;
-	struct ubifs_ino_node *ino;
-	struct ubifs_info *c = sb->s_fs_info;
-	struct inode *inode;
-	struct ubifs_inode *ui;
-
-	dbg_gen("inode %lu", inum);
-
-	inode = iget_locked(sb, inum);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
-	if (!(inode->i_state & I_NEW))
-		return inode;
-	ui = ubifs_inode(inode);
-
-	ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
-	if (!ino) {
-		err = -ENOMEM;
-		goto out;
+	if (c->libubi) {
+		libubi_close(c->libubi);
+		c->libubi = NULL;
 	}
+}
 
-	ino_key_init(c, &key, inode->i_ino);
+/**
+ * open_target - open the output target.
+ * @c: the UBIFS file-system description object
+ *
+ * Open the output target. The target can be an UBI volume
+ * or a file.
+ *
+ * Returns %0 in case of success and a negative error code in case of failure.
+ */
+int open_target(struct ubifs_info *c)
+{
+	if (c->libubi) {
+		c->dev_fd = open(c->dev_name, O_RDWR | O_EXCL);
 
-	err = ubifs_tnc_lookup(c, &key, ino);
-	if (err)
-		goto out_ino;
-
-	inode->i_flags |= S_NOCMTIME;
-
-	if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
-		inode->i_flags |= S_NOATIME;
-
-	set_nlink(inode, le32_to_cpu(ino->nlink));
-	i_uid_write(inode, le32_to_cpu(ino->uid));
-	i_gid_write(inode, le32_to_cpu(ino->gid));
-	inode_set_atime(inode, (int64_t)le64_to_cpu(ino->atime_sec),
-			le32_to_cpu(ino->atime_nsec));
-	inode_set_mtime(inode, (int64_t)le64_to_cpu(ino->mtime_sec),
-			le32_to_cpu(ino->mtime_nsec));
-	inode_set_ctime(inode, (int64_t)le64_to_cpu(ino->ctime_sec),
-			le32_to_cpu(ino->ctime_nsec));
-	inode->i_mode = le32_to_cpu(ino->mode);
-	inode->i_size = le64_to_cpu(ino->size);
-
-	ui->data_len    = le32_to_cpu(ino->data_len);
-	ui->flags       = le32_to_cpu(ino->flags);
-	ui->compr_type  = le16_to_cpu(ino->compr_type);
-	ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
-	ui->xattr_cnt   = le32_to_cpu(ino->xattr_cnt);
-	ui->xattr_size  = le32_to_cpu(ino->xattr_size);
-	ui->xattr_names = le32_to_cpu(ino->xattr_names);
-	ui->synced_i_size = ui->ui_size = inode->i_size;
-
-	ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
-
-	err = validate_inode(c, inode);
-	if (err)
-		goto out_invalid;
-
-	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) {
-			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';
-		} else if (ui->data_len != 0) {
-			err = 10;
-			goto out_invalid;
-		}
-		break;
-	case S_IFDIR:
-		inode->i_op  = &ubifs_dir_inode_operations;
-		inode->i_fop = &ubifs_dir_operations;
-		if (ui->data_len != 0) {
-			err = 11;
-			goto out_invalid;
+		if (c->dev_fd == -1) {
+			ubifs_err(c, "cannot open the UBI volume. %s",
+				  strerror(errno));
+			return -errno;
 		}
-		break;
-	case S_IFLNK:
-		inode->i_op = &ubifs_symlink_inode_operations;
-		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';
-		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;
+		if (ubi_set_property(c->dev_fd, UBI_VOL_PROP_DIRECT_WRITE, 1)) {
+			close(c->dev_fd);
+			ubifs_err(c, "ubi_set_property(set direct_write) failed. %s",
+				  strerror(errno));
+			return -errno;
 		}
-
-		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;
+	} else {
+		c->dev_fd = open(c->dev_name, O_CREAT | O_RDWR | O_TRUNC,
+			      S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
+		if (c->dev_fd == -1) {
+			ubifs_err(c, "cannot create output file. %s",
+				  strerror(errno));
+			return -errno;
 		}
-		break;
-	default:
-		err = 15;
-		goto out_invalid;
 	}
-
-	kfree(ino);
-	ubifs_set_inode_flags(inode);
-	unlock_new_inode(inode);
-	return inode;
-
-out_invalid:
-	ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err);
-	ubifs_dump_node(c, ino, UBIFS_MAX_INO_NODE_SZ);
-	ubifs_dump_inode(c, inode);
-	err = -EINVAL;
-out_ino:
-	kfree(ino);
-out:
-	ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err);
-	iget_failed(inode);
-	return ERR_PTR(err);
-}
-
-static struct inode *ubifs_alloc_inode(struct super_block *sb)
-{
-	struct ubifs_inode *ui;
-
-	ui = alloc_inode_sb(sb, ubifs_inode_slab, GFP_NOFS);
-	if (!ui)
-		return NULL;
-
-	memset((void *)ui + sizeof(struct inode), 0,
-	       sizeof(struct ubifs_inode) - sizeof(struct inode));
-	mutex_init(&ui->ui_mutex);
-	init_rwsem(&ui->xattr_sem);
-	spin_lock_init(&ui->ui_lock);
-	return &ui->vfs_inode;
-};
-
-static void ubifs_free_inode(struct inode *inode)
-{
-	struct ubifs_inode *ui = ubifs_inode(inode);
-
-	kfree(ui->data);
-	fscrypt_free_inode(inode);
-
-	kmem_cache_free(ubifs_inode_slab, ui);
+	return 0;
 }
 
-/*
- * Note, Linux write-back code calls this without 'i_mutex'.
+/**
+ * close_target - close the output target.
+ * @c: the UBIFS file-system description object
+ *
+ * Close the output target. If the target was an UBI
+ * volume, also close libubi.
+ *
+ * Returns %0 in case of success and a negative error code in case of failure.
  */
-static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
-{
-	int err = 0;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-
-	ubifs_assert(c, !ui->xattr);
-	if (is_bad_inode(inode))
-		return 0;
-
-	mutex_lock(&ui->ui_mutex);
-	/*
-	 * Due to races between write-back forced by budgeting
-	 * (see 'sync_some_inodes()') and background write-back, the inode may
-	 * have already been synchronized, do not do this again. This might
-	 * also happen if it was synchronized in an VFS operation, e.g.
-	 * 'ubifs_link()'.
-	 */
-	if (!ui->dirty) {
-		mutex_unlock(&ui->ui_mutex);
-		return 0;
-	}
-
-	/*
-	 * As an optimization, do not write orphan inodes to the media just
-	 * because this is not needed.
-	 */
-	dbg_gen("inode %lu, mode %#x, nlink %u",
-		inode->i_ino, (int)inode->i_mode, inode->i_nlink);
-	if (inode->i_nlink) {
-		err = ubifs_jnl_write_inode(c, inode);
-		if (err)
-			ubifs_err(c, "can't write inode %lu, error %d",
-				  inode->i_ino, err);
-		else
-			err = dbg_check_inode_size(c, inode, ui->ui_size);
-	}
-
-	ui->dirty = 0;
-	mutex_unlock(&ui->ui_mutex);
-	ubifs_release_dirty_inode_budget(c, ui);
-	return err;
-}
-
-static int ubifs_drop_inode(struct inode *inode)
-{
-	int drop = generic_drop_inode(inode);
-
-	if (!drop)
-		drop = fscrypt_drop_inode(inode);
-
-	return drop;
-}
-
-static void ubifs_evict_inode(struct inode *inode)
-{
-	int err;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-
-	if (ui->xattr)
-		/*
-		 * Extended attribute inode deletions are fully handled in
-		 * 'ubifs_removexattr()'. These inodes are special and have
-		 * limited usage, so there is nothing to do here.
-		 */
-		goto out;
-
-	dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
-	ubifs_assert(c, !atomic_read(&inode->i_count));
-
-	truncate_inode_pages_final(&inode->i_data);
-
-	if (inode->i_nlink)
-		goto done;
-
-	if (is_bad_inode(inode))
-		goto out;
-
-	ui->ui_size = inode->i_size = 0;
-	err = ubifs_jnl_delete_inode(c, inode);
-	if (err)
-		/*
-		 * Worst case we have a lost orphan inode wasting space, so a
-		 * simple error message is OK here.
-		 */
-		ubifs_err(c, "can't delete inode %lu, error %d",
-			  inode->i_ino, err);
-
-out:
-	if (ui->dirty)
-		ubifs_release_dirty_inode_budget(c, ui);
-	else {
-		/* We've deleted something - clean the "no space" flags */
-		c->bi.nospace = c->bi.nospace_rp = 0;
-		smp_wmb();
-	}
-done:
-	clear_inode(inode);
-	fscrypt_put_encryption_info(inode);
-}
-
-static void ubifs_dirty_inode(struct inode *inode, int flags)
+int close_target(struct ubifs_info *c)
 {
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-	struct ubifs_inode *ui = ubifs_inode(inode);
-
-	ubifs_assert(c, mutex_is_locked(&ui->ui_mutex));
-	if (!ui->dirty) {
-		ui->dirty = 1;
-		dbg_gen("inode %lu",  inode->i_ino);
+	if (c->dev_fd >= 0) {
+		if (c->libubi && ubi_set_property(c->dev_fd, UBI_VOL_PROP_DIRECT_WRITE, 0)) {
+			ubifs_err(c, "ubi_set_property(clear direct_write) failed. %s",
+				  strerror(errno));
+			return -errno;
+		}
+		if (close(c->dev_fd) == -1) {
+			ubifs_err(c, "cannot close the target. %s",
+				  strerror(errno));
+			return -errno;
+		}
 	}
-}
-
-static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
-	struct ubifs_info *c = dentry->d_sb->s_fs_info;
-	unsigned long long free;
-	__le32 *uuid = (__le32 *)c->uuid;
-
-	free = ubifs_get_free_space(c);
-	dbg_gen("free space %lld bytes (%lld blocks)",
-		free, free >> UBIFS_BLOCK_SHIFT);
-
-	buf->f_type = UBIFS_SUPER_MAGIC;
-	buf->f_bsize = UBIFS_BLOCK_SIZE;
-	buf->f_blocks = c->block_cnt;
-	buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
-	if (free > c->report_rp_size)
-		buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
-	else
-		buf->f_bavail = 0;
-	buf->f_files = 0;
-	buf->f_ffree = 0;
-	buf->f_namelen = UBIFS_MAX_NLEN;
-	buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
-	buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
-	ubifs_assert(c, buf->f_bfree <= c->block_cnt);
 	return 0;
 }
 
-static int ubifs_show_options(struct seq_file *s, struct dentry *root)
+/**
+ * check_volume_empty - check if the UBI volume is empty.
+ * @c: the UBIFS file-system description object
+ *
+ * This function checks if the UBI volume is empty by looking if its LEBs are
+ * mapped or not.
+ *
+ * Returns %0 in case of success, %1 is the volume is not empty,
+ * and a negative error code in case of failure.
+ */
+int check_volume_empty(struct ubifs_info *c)
 {
-	struct ubifs_info *c = root->d_sb->s_fs_info;
-
-	if (c->mount_opts.unmount_mode == 2)
-		seq_puts(s, ",fast_unmount");
-	else if (c->mount_opts.unmount_mode == 1)
-		seq_puts(s, ",norm_unmount");
-
-	if (c->mount_opts.bulk_read == 2)
-		seq_puts(s, ",bulk_read");
-	else if (c->mount_opts.bulk_read == 1)
-		seq_puts(s, ",no_bulk_read");
-
-	if (c->mount_opts.chk_data_crc == 2)
-		seq_puts(s, ",chk_data_crc");
-	else if (c->mount_opts.chk_data_crc == 1)
-		seq_puts(s, ",no_chk_data_crc");
-
-	if (c->mount_opts.override_compr) {
-		seq_printf(s, ",compr=%s",
-			   ubifs_compr_name(c, c->mount_opts.compr_type));
-	}
-
-	seq_printf(s, ",assert=%s", ubifs_assert_action_name(c));
-	seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id);
+	int lnum, err;
 
+	for (lnum = 0; lnum < c->vi.rsvd_lebs; lnum++) {
+		err = ubi_is_mapped(c->dev_fd, lnum);
+		if (err < 0)
+			return err;
+		if (err == 1)
+			return 1;
+	}
 	return 0;
 }
 
-static int ubifs_sync_fs(struct super_block *sb, int wait)
-{
-	int i, err;
-	struct ubifs_info *c = sb->s_fs_info;
-
-	/*
-	 * Zero @wait is just an advisory thing to help the file system shove
-	 * lots of data into the queues, and there will be the second
-	 * '->sync_fs()' call, with non-zero @wait.
-	 */
-	if (!wait)
-		return 0;
-
-	/*
-	 * Synchronize write buffers, because 'ubifs_run_commit()' does not
-	 * do this if it waits for an already running commit.
-	 */
-	for (i = 0; i < c->jhead_cnt; i++) {
-		err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
-		if (err)
-			return err;
+void init_ubifs_info(struct ubifs_info *c, int program_type)
+{
+	spin_lock_init(&c->cnt_lock);
+	spin_lock_init(&c->cs_lock);
+	spin_lock_init(&c->buds_lock);
+	spin_lock_init(&c->space_lock);
+	spin_lock_init(&c->orphan_lock);
+	init_rwsem(&c->commit_sem);
+	mutex_init(&c->lp_mutex);
+	mutex_init(&c->tnc_mutex);
+	mutex_init(&c->log_mutex);
+	c->buds = RB_ROOT;
+	c->old_idx = RB_ROOT;
+	c->size_tree = RB_ROOT;
+	c->orph_tree = RB_ROOT;
+	INIT_LIST_HEAD(&c->idx_gc);
+	INIT_LIST_HEAD(&c->replay_list);
+	INIT_LIST_HEAD(&c->replay_buds);
+	INIT_LIST_HEAD(&c->uncat_list);
+	INIT_LIST_HEAD(&c->empty_list);
+	INIT_LIST_HEAD(&c->freeable_list);
+	INIT_LIST_HEAD(&c->frdi_idx_list);
+	INIT_LIST_HEAD(&c->unclean_leb_list);
+	INIT_LIST_HEAD(&c->old_buds);
+	INIT_LIST_HEAD(&c->orph_list);
+	INIT_LIST_HEAD(&c->orph_new);
+	c->no_chk_data_crc = 1;
+
+	c->highest_inum = UBIFS_FIRST_INO;
+	c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
+
+	c->program_type = program_type;
+	switch (c->program_type) {
+	case MKFS_PROGRAM_TYPE:
+		c->program_name = MKFS_PROGRAM_NAME;
+		break;
+	default:
+		assert(0);
+		break;
 	}
-
-	/*
-	 * Strictly speaking, it is not necessary to commit the journal here,
-	 * synchronizing write-buffers would be enough. But committing makes
-	 * UBIFS free space predictions much more accurate, so we want to let
-	 * the user be able to get more accurate results of 'statfs()' after
-	 * they synchronize the file system.
-	 */
-	err = ubifs_run_commit(c);
-	if (err)
-		return err;
-
-	return ubi_sync(c->vi.ubi_num);
+	c->dev_fd = -1;
+	c->debug_level = default_debug_level;
 }
 
 /**
@@ -506,46 +209,49 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
  * requirements. Returns zero in case of success and a negative error code in
  * case of failure.
  */
-static int init_constants_early(struct ubifs_info *c)
+int init_constants_early(struct ubifs_info *c)
 {
+#define NOR_MAX_WRITESZ 64
 	if (c->vi.corrupted) {
 		ubifs_warn(c, "UBI volume is corrupted - read-only mode");
 		c->ro_media = 1;
 	}
 
-	if (c->di.ro_mode) {
-		ubifs_msg(c, "read-only UBI device");
-		c->ro_media = 1;
-	}
-
-	if (c->vi.vol_type == UBI_STATIC_VOLUME) {
+	if (c->vi.type == UBI_STATIC_VOLUME) {
 		ubifs_msg(c, "static UBI volume - read-only mode");
 		c->ro_media = 1;
 	}
 
-	c->leb_cnt = c->vi.size;
-	c->leb_size = c->vi.usable_leb_size;
-	c->leb_start = c->di.leb_start;
+	c->max_inode_sz = key_max_inode_size(c);
+	c->leb_cnt = c->vi.rsvd_lebs;
+	c->leb_size = c->vi.leb_size;
 	c->half_leb_size = c->leb_size / 2;
 	c->min_io_size = c->di.min_io_size;
 	c->min_io_shift = fls(c->min_io_size) - 1;
-	c->max_write_size = c->di.max_write_size;
+	if (c->min_io_size == 1)
+		/*
+		 * Different from linux kernel, the max write size of nor flash
+		 * is not exposed in sysfs, just reset @c->max_write_size.
+		 */
+		c->max_write_size = NOR_MAX_WRITESZ;
+	else
+		c->max_write_size = c->di.min_io_size;
 	c->max_write_shift = fls(c->max_write_size) - 1;
 
 	if (c->leb_size < UBIFS_MIN_LEB_SZ) {
-		ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes",
-			   c->leb_size, UBIFS_MIN_LEB_SZ);
+		ubifs_err(c, "too small LEBs (%d bytes), min. is %d bytes",
+			  c->leb_size, UBIFS_MIN_LEB_SZ);
 		return -EINVAL;
 	}
 
 	if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
-		ubifs_errc(c, "too few LEBs (%d), min. is %d",
-			   c->leb_cnt, UBIFS_MIN_LEB_CNT);
+		ubifs_err(c, "too few LEBs (%d), min. is %d",
+			  c->leb_cnt, UBIFS_MIN_LEB_CNT);
 		return -EINVAL;
 	}
 
 	if (!is_power_of_2(c->min_io_size)) {
-		ubifs_errc(c, "bad min. I/O size %d", c->min_io_size);
+		ubifs_err(c, "bad min. I/O size %d", c->min_io_size);
 		return -EINVAL;
 	}
 
@@ -556,8 +262,8 @@ static int init_constants_early(struct ubifs_info *c)
 	if (c->max_write_size < c->min_io_size ||
 	    c->max_write_size % c->min_io_size ||
 	    !is_power_of_2(c->max_write_size)) {
-		ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit",
-			   c->max_write_size, c->min_io_size);
+		ubifs_err(c, "bad write buffer size %d for %d min. I/O unit",
+			  c->max_write_size, c->min_io_size);
 		return -EINVAL;
 	}
 
@@ -630,11 +336,6 @@ static int init_constants_early(struct ubifs_info *c)
 	 */
 	c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
 
-	/* Buffer size for bulk-reads */
-	c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
-	if (c->max_bu_buf_len > c->leb_size)
-		c->max_bu_buf_len = c->leb_size;
-
 	/* Log is ready, preserve one LEB for commits. */
 	c->min_log_bytes = c->leb_size;
 
@@ -670,7 +371,7 @@ static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
  * makes sure they are all right. Returns zero in case of success and a
  * negative error code in case of failure.
  */
-static int init_constants_sb(struct ubifs_info *c)
+int init_constants_sb(struct ubifs_info *c)
 {
 	int tmp, err;
 	long long tmp64;
@@ -760,26 +461,9 @@ static int init_constants_sb(struct ubifs_info *c)
  * the master node has been read. It also checks various UBIFS parameters and
  * makes sure they are all right.
  */
-static void init_constants_master(struct ubifs_info *c)
+void init_constants_master(struct ubifs_info *c)
 {
-	long long tmp64;
-
 	c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
-	c->report_rp_size = ubifs_reported_space(c, c->rp_size);
-
-	/*
-	 * Calculate total amount of FS blocks. This number is not used
-	 * internally because it does not make much sense for UBIFS, but it is
-	 * necessary to report something for the 'statfs()' call.
-	 *
-	 * Subtract the LEB reserved for GC, the LEB which is reserved for
-	 * deletions, minimum LEBs for the index, and assume only one journal
-	 * head is available.
-	 */
-	tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
-	tmp64 *= (long long)c->leb_size - c->leb_overhead;
-	tmp64 = ubifs_reported_space(c, tmp64);
-	c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
 }
 
 /**
@@ -793,7 +477,7 @@ static void init_constants_master(struct ubifs_info *c)
  * returns zero in case of success and a negative error code in case of
  * failure.
  */
-static int take_gc_lnum(struct ubifs_info *c)
+int take_gc_lnum(struct ubifs_info *c)
 {
 	int err;
 
@@ -815,7 +499,7 @@ static int take_gc_lnum(struct ubifs_info *c)
  * This helper function allocates and initializes UBIFS write-buffers. Returns
  * zero in case of success and %-ENOMEM in case of failure.
  */
-static int alloc_wbufs(struct ubifs_info *c)
+int alloc_wbufs(struct ubifs_info *c)
 {
 	int i, err;
 
@@ -845,7 +529,6 @@ static int alloc_wbufs(struct ubifs_info *c)
 	 * Garbage Collector head does not need to be synchronized by timer.
 	 * Also GC head nodes are not grouped.
 	 */
-	c->jheads[GCHD].wbuf.no_timer = 1;
 	c->jheads[GCHD].grouped = 0;
 
 	return 0;
@@ -870,7 +553,7 @@ out_wbuf:
  * free_wbufs - free write-buffers.
  * @c: UBIFS file-system description object
  */
-static void free_wbufs(struct ubifs_info *c)
+void free_wbufs(struct ubifs_info *c)
 {
 	int i;
 
@@ -889,7 +572,7 @@ static void free_wbufs(struct ubifs_info *c)
  * free_orphans - free orphans.
  * @c: UBIFS file-system description object
  */
-static void free_orphans(struct ubifs_info *c)
+void free_orphans(struct ubifs_info *c)
 {
 	struct ubifs_orphan *orph;
 
@@ -926,257 +609,13 @@ static void free_buds(struct ubifs_info *c)
 }
 
 /**
- * check_volume_empty - check if the UBI volume is empty.
- * @c: UBIFS file-system description object
- *
- * This function checks if the UBIFS volume is empty by looking if its LEBs are
- * mapped or not. The result of checking is stored in the @c->empty variable.
- * Returns zero in case of success and a negative error code in case of
- * failure.
- */
-static int check_volume_empty(struct ubifs_info *c)
-{
-	int lnum, err;
-
-	c->empty = 1;
-	for (lnum = 0; lnum < c->leb_cnt; lnum++) {
-		err = ubifs_is_mapped(c, lnum);
-		if (unlikely(err < 0))
-			return err;
-		if (err == 1) {
-			c->empty = 0;
-			break;
-		}
-
-		cond_resched();
-	}
-
-	return 0;
-}
-
-/*
- * UBIFS mount options.
- *
- * Opt_fast_unmount: do not run a journal commit before un-mounting
- * Opt_norm_unmount: run a journal commit before un-mounting
- * Opt_bulk_read: enable bulk-reads
- * Opt_no_bulk_read: disable bulk-reads
- * Opt_chk_data_crc: check CRCs when reading data nodes
- * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
- * Opt_override_compr: override default compressor
- * Opt_assert: set ubifs_assert() action
- * Opt_auth_key: The key name used for authentication
- * Opt_auth_hash_name: The hash type used for authentication
- * Opt_err: just end of array marker
- */
-enum {
-	Opt_fast_unmount,
-	Opt_norm_unmount,
-	Opt_bulk_read,
-	Opt_no_bulk_read,
-	Opt_chk_data_crc,
-	Opt_no_chk_data_crc,
-	Opt_override_compr,
-	Opt_assert,
-	Opt_auth_key,
-	Opt_auth_hash_name,
-	Opt_ignore,
-	Opt_err,
-};
-
-static const match_table_t tokens = {
-	{Opt_fast_unmount, "fast_unmount"},
-	{Opt_norm_unmount, "norm_unmount"},
-	{Opt_bulk_read, "bulk_read"},
-	{Opt_no_bulk_read, "no_bulk_read"},
-	{Opt_chk_data_crc, "chk_data_crc"},
-	{Opt_no_chk_data_crc, "no_chk_data_crc"},
-	{Opt_override_compr, "compr=%s"},
-	{Opt_auth_key, "auth_key=%s"},
-	{Opt_auth_hash_name, "auth_hash_name=%s"},
-	{Opt_ignore, "ubi=%s"},
-	{Opt_ignore, "vol=%s"},
-	{Opt_assert, "assert=%s"},
-	{Opt_err, NULL},
-};
-
-/**
- * parse_standard_option - parse a standard mount option.
- * @option: the option to parse
- *
- * Normally, standard mount options like "sync" are passed to file-systems as
- * flags. However, when a "rootflags=" kernel boot parameter is used, they may
- * be present in the options string. This function tries to deal with this
- * situation and parse standard options. Returns 0 if the option was not
- * recognized, and the corresponding integer flag if it was.
- *
- * UBIFS is only interested in the "sync" option, so do not check for anything
- * else.
- */
-static int parse_standard_option(const char *option)
-{
-
-	pr_notice("UBIFS: parse %s\n", option);
-	if (!strcmp(option, "sync"))
-		return SB_SYNCHRONOUS;
-	return 0;
-}
-
-/**
- * ubifs_parse_options - parse mount parameters.
- * @c: UBIFS file-system description object
- * @options: parameters to parse
- * @is_remount: non-zero if this is FS re-mount
- *
- * This function parses UBIFS mount options and returns zero in case success
- * and a negative error code in case of failure.
- */
-static int ubifs_parse_options(struct ubifs_info *c, char *options,
-			       int is_remount)
-{
-	char *p;
-	substring_t args[MAX_OPT_ARGS];
-
-	if (!options)
-		return 0;
-
-	while ((p = strsep(&options, ","))) {
-		int token;
-
-		if (!*p)
-			continue;
-
-		token = match_token(p, tokens, args);
-		switch (token) {
-		/*
-		 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
-		 * We accept them in order to be backward-compatible. But this
-		 * should be removed at some point.
-		 */
-		case Opt_fast_unmount:
-			c->mount_opts.unmount_mode = 2;
-			break;
-		case Opt_norm_unmount:
-			c->mount_opts.unmount_mode = 1;
-			break;
-		case Opt_bulk_read:
-			c->mount_opts.bulk_read = 2;
-			c->bulk_read = 1;
-			break;
-		case Opt_no_bulk_read:
-			c->mount_opts.bulk_read = 1;
-			c->bulk_read = 0;
-			break;
-		case Opt_chk_data_crc:
-			c->mount_opts.chk_data_crc = 2;
-			c->no_chk_data_crc = 0;
-			break;
-		case Opt_no_chk_data_crc:
-			c->mount_opts.chk_data_crc = 1;
-			c->no_chk_data_crc = 1;
-			break;
-		case Opt_override_compr:
-		{
-			char *name = match_strdup(&args[0]);
-
-			if (!name)
-				return -ENOMEM;
-			if (!strcmp(name, "none"))
-				c->mount_opts.compr_type = UBIFS_COMPR_NONE;
-			else if (!strcmp(name, "lzo"))
-				c->mount_opts.compr_type = UBIFS_COMPR_LZO;
-			else if (!strcmp(name, "zlib"))
-				c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
-			else if (!strcmp(name, "zstd"))
-				c->mount_opts.compr_type = UBIFS_COMPR_ZSTD;
-			else {
-				ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready?
-				kfree(name);
-				return -EINVAL;
-			}
-			kfree(name);
-			c->mount_opts.override_compr = 1;
-			c->default_compr = c->mount_opts.compr_type;
-			break;
-		}
-		case Opt_assert:
-		{
-			char *act = match_strdup(&args[0]);
-
-			if (!act)
-				return -ENOMEM;
-			if (!strcmp(act, "report"))
-				c->assert_action = ASSACT_REPORT;
-			else if (!strcmp(act, "read-only"))
-				c->assert_action = ASSACT_RO;
-			else if (!strcmp(act, "panic"))
-				c->assert_action = ASSACT_PANIC;
-			else {
-				ubifs_err(c, "unknown assert action \"%s\"", act);
-				kfree(act);
-				return -EINVAL;
-			}
-			kfree(act);
-			break;
-		}
-		case Opt_auth_key:
-			if (!is_remount) {
-				c->auth_key_name = kstrdup(args[0].from,
-								GFP_KERNEL);
-				if (!c->auth_key_name)
-					return -ENOMEM;
-			}
-			break;
-		case Opt_auth_hash_name:
-			if (!is_remount) {
-				c->auth_hash_name = kstrdup(args[0].from,
-								GFP_KERNEL);
-				if (!c->auth_hash_name)
-					return -ENOMEM;
-			}
-			break;
-		case Opt_ignore:
-			break;
-		default:
-		{
-			unsigned long flag;
-			struct super_block *sb = c->vfs_sb;
-
-			flag = parse_standard_option(p);
-			if (!flag) {
-				ubifs_err(c, "unrecognized mount option \"%s\" or missing value",
-					  p);
-				return -EINVAL;
-			}
-			sb->s_flags |= flag;
-			break;
-		}
-		}
-	}
-
-	return 0;
-}
-
-/*
- * ubifs_release_options - release mount parameters which have been dumped.
- * @c: UBIFS file-system description object
- */
-static void ubifs_release_options(struct ubifs_info *c)
-{
-	kfree(c->auth_key_name);
-	c->auth_key_name = NULL;
-	kfree(c->auth_hash_name);
-	c->auth_hash_name = NULL;
-}
-
-/**
  * destroy_journal - destroy journal data structures.
  * @c: UBIFS file-system description object
  *
  * This function destroys journal data structures including those that may have
  * been created by recovery functions.
  */
-static void destroy_journal(struct ubifs_info *c)
+void destroy_journal(struct ubifs_info *c)
 {
 	while (!list_empty(&c->unclean_leb_list)) {
 		struct ubifs_unclean_leb *ucleb;
@@ -1199,1307 +638,3 @@ static void destroy_journal(struct ubifs_info *c)
 	ubifs_tnc_close(c);
 	free_buds(c);
 }
-
-/**
- * bu_init - initialize bulk-read information.
- * @c: UBIFS file-system description object
- */
-static void bu_init(struct ubifs_info *c)
-{
-	ubifs_assert(c, c->bulk_read == 1);
-
-	if (c->bu.buf)
-		return; /* Already initialized */
-
-again:
-	c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
-	if (!c->bu.buf) {
-		if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
-			c->max_bu_buf_len = UBIFS_KMALLOC_OK;
-			goto again;
-		}
-
-		/* Just disable bulk-read */
-		ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it",
-			   c->max_bu_buf_len);
-		c->mount_opts.bulk_read = 1;
-		c->bulk_read = 0;
-		return;
-	}
-}
-
-/**
- * check_free_space - check if there is enough free space to mount.
- * @c: UBIFS file-system description object
- *
- * This function makes sure UBIFS has enough free space to be mounted in
- * read/write mode. UBIFS must always have some free space to allow deletions.
- */
-static int check_free_space(struct ubifs_info *c)
-{
-	ubifs_assert(c, c->dark_wm > 0);
-	if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
-		ubifs_err(c, "insufficient free space to mount in R/W mode");
-		ubifs_dump_budg(c, &c->bi);
-		ubifs_dump_lprops(c);
-		return -ENOSPC;
-	}
-	return 0;
-}
-
-/**
- * mount_ubifs - mount UBIFS file-system.
- * @c: UBIFS file-system description object
- *
- * This function mounts UBIFS file system. Returns zero in case of success and
- * a negative error code in case of failure.
- */
-static int mount_ubifs(struct ubifs_info *c)
-{
-	int err;
-	long long x, y;
-	size_t sz;
-
-	c->ro_mount = !!sb_rdonly(c->vfs_sb);
-	/* Suppress error messages while probing if SB_SILENT is set */
-	c->probing = !!(c->vfs_sb->s_flags & SB_SILENT);
-
-	err = init_constants_early(c);
-	if (err)
-		return err;
-
-	err = ubifs_debugging_init(c);
-	if (err)
-		return err;
-
-	err = ubifs_sysfs_register(c);
-	if (err)
-		goto out_debugging;
-
-	err = check_volume_empty(c);
-	if (err)
-		goto out_free;
-
-	if (c->empty && (c->ro_mount || c->ro_media)) {
-		/*
-		 * This UBI volume is empty, and read-only, or the file system
-		 * is mounted read-only - we cannot format it.
-		 */
-		ubifs_err(c, "can't format empty UBI volume: read-only %s",
-			  c->ro_media ? "UBI volume" : "mount");
-		err = -EROFS;
-		goto out_free;
-	}
-
-	if (c->ro_media && !c->ro_mount) {
-		ubifs_err(c, "cannot mount read-write - read-only media");
-		err = -EROFS;
-		goto out_free;
-	}
-
-	/*
-	 * The requirement for the buffer is that it should fit indexing B-tree
-	 * height amount of integers. We assume the height if the TNC tree will
-	 * never exceed 64.
-	 */
-	err = -ENOMEM;
-	c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int),
-					 GFP_KERNEL);
-	if (!c->bottom_up_buf)
-		goto out_free;
-
-	c->sbuf = vmalloc(c->leb_size);
-	if (!c->sbuf)
-		goto out_free;
-
-	if (!c->ro_mount) {
-		c->ileb_buf = vmalloc(c->leb_size);
-		if (!c->ileb_buf)
-			goto out_free;
-	}
-
-	if (c->bulk_read == 1)
-		bu_init(c);
-
-	if (!c->ro_mount) {
-		c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
-					       UBIFS_CIPHER_BLOCK_SIZE,
-					       GFP_KERNEL);
-		if (!c->write_reserve_buf)
-			goto out_free;
-	}
-
-	c->mounting = 1;
-
-	if (c->auth_key_name) {
-		if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) {
-			err = ubifs_init_authentication(c);
-			if (err)
-				goto out_free;
-		} else {
-			ubifs_err(c, "auth_key_name, but UBIFS is built without"
-				  " authentication support");
-			err = -EINVAL;
-			goto out_free;
-		}
-	}
-
-	err = ubifs_read_superblock(c);
-	if (err)
-		goto out_auth;
-
-	c->probing = 0;
-
-	/*
-	 * Make sure the compressor which is set as default in the superblock
-	 * or overridden by mount options is actually compiled in.
-	 */
-	if (!ubifs_compr_present(c, c->default_compr)) {
-		ubifs_err(c, "'compressor \"%s\" is not compiled in",
-			  ubifs_compr_name(c, c->default_compr));
-		err = -ENOTSUPP;
-		goto out_auth;
-	}
-
-	err = init_constants_sb(c);
-	if (err)
-		goto out_auth;
-
-	sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2;
-	c->cbuf = kmalloc(sz, GFP_NOFS);
-	if (!c->cbuf) {
-		err = -ENOMEM;
-		goto out_auth;
-	}
-
-	err = alloc_wbufs(c);
-	if (err)
-		goto out_cbuf;
-
-	sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
-	if (!c->ro_mount) {
-		/* Create background thread */
-		c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name);
-		if (IS_ERR(c->bgt)) {
-			err = PTR_ERR(c->bgt);
-			c->bgt = NULL;
-			ubifs_err(c, "cannot spawn \"%s\", error %d",
-				  c->bgt_name, err);
-			goto out_wbufs;
-		}
-	}
-
-	err = ubifs_read_master(c);
-	if (err)
-		goto out_master;
-
-	init_constants_master(c);
-
-	if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
-		ubifs_msg(c, "recovery needed");
-		c->need_recovery = 1;
-	}
-
-	if (c->need_recovery && !c->ro_mount) {
-		err = ubifs_recover_inl_heads(c, c->sbuf);
-		if (err)
-			goto out_master;
-	}
-
-	err = ubifs_lpt_init(c, 1, !c->ro_mount);
-	if (err)
-		goto out_master;
-
-	if (!c->ro_mount && c->space_fixup) {
-		err = ubifs_fixup_free_space(c);
-		if (err)
-			goto out_lpt;
-	}
-
-	if (!c->ro_mount && !c->need_recovery) {
-		/*
-		 * Set the "dirty" flag so that if we reboot uncleanly we
-		 * will notice this immediately on the next mount.
-		 */
-		c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
-		err = ubifs_write_master(c);
-		if (err)
-			goto out_lpt;
-	}
-
-	/*
-	 * Handle offline signed images: Now that the master node is
-	 * written and its validation no longer depends on the hash
-	 * in the superblock, we can update the offline signed
-	 * superblock with a HMAC version,
-	 */
-	if (ubifs_authenticated(c) && ubifs_hmac_zero(c, c->sup_node->hmac)) {
-		err = ubifs_hmac_wkm(c, c->sup_node->hmac_wkm);
-		if (err)
-			goto out_lpt;
-		c->superblock_need_write = 1;
-	}
-
-	if (!c->ro_mount && c->superblock_need_write) {
-		err = ubifs_write_sb_node(c, c->sup_node);
-		if (err)
-			goto out_lpt;
-		c->superblock_need_write = 0;
-	}
-
-	err = dbg_check_idx_size(c, c->bi.old_idx_sz);
-	if (err)
-		goto out_lpt;
-
-	err = ubifs_replay_journal(c);
-	if (err)
-		goto out_journal;
-
-	/* Calculate 'min_idx_lebs' after journal replay */
-	c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
-
-	err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
-	if (err)
-		goto out_orphans;
-
-	if (!c->ro_mount) {
-		int lnum;
-
-		err = check_free_space(c);
-		if (err)
-			goto out_orphans;
-
-		/* Check for enough log space */
-		lnum = c->lhead_lnum + 1;
-		if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
-			lnum = UBIFS_LOG_LNUM;
-		if (lnum == c->ltail_lnum) {
-			err = ubifs_consolidate_log(c);
-			if (err)
-				goto out_orphans;
-		}
-
-		if (c->need_recovery) {
-			if (!ubifs_authenticated(c)) {
-				err = ubifs_recover_size(c, true);
-				if (err)
-					goto out_orphans;
-			}
-
-			err = ubifs_rcvry_gc_commit(c);
-			if (err)
-				goto out_orphans;
-
-			if (ubifs_authenticated(c)) {
-				err = ubifs_recover_size(c, false);
-				if (err)
-					goto out_orphans;
-			}
-		} else {
-			err = take_gc_lnum(c);
-			if (err)
-				goto out_orphans;
-
-			/*
-			 * GC LEB may contain garbage if there was an unclean
-			 * reboot, and it should be un-mapped.
-			 */
-			err = ubifs_leb_unmap(c, c->gc_lnum);
-			if (err)
-				goto out_orphans;
-		}
-
-		err = dbg_check_lprops(c);
-		if (err)
-			goto out_orphans;
-	} else if (c->need_recovery) {
-		err = ubifs_recover_size(c, false);
-		if (err)
-			goto out_orphans;
-	} else {
-		/*
-		 * Even if we mount read-only, we have to set space in GC LEB
-		 * to proper value because this affects UBIFS free space
-		 * reporting. We do not want to have a situation when
-		 * re-mounting from R/O to R/W changes amount of free space.
-		 */
-		err = take_gc_lnum(c);
-		if (err)
-			goto out_orphans;
-	}
-
-	spin_lock(&ubifs_infos_lock);
-	list_add_tail(&c->infos_list, &ubifs_infos);
-	spin_unlock(&ubifs_infos_lock);
-
-	if (c->need_recovery) {
-		if (c->ro_mount)
-			ubifs_msg(c, "recovery deferred");
-		else {
-			c->need_recovery = 0;
-			ubifs_msg(c, "recovery completed");
-			/*
-			 * GC LEB has to be empty and taken at this point. But
-			 * the journal head LEBs may also be accounted as
-			 * "empty taken" if they are empty.
-			 */
-			ubifs_assert(c, c->lst.taken_empty_lebs > 0);
-		}
-	} else
-		ubifs_assert(c, c->lst.taken_empty_lebs > 0);
-
-	err = dbg_check_filesystem(c);
-	if (err)
-		goto out_infos;
-
-	dbg_debugfs_init_fs(c);
-
-	c->mounting = 0;
-
-	ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
-		  c->vi.ubi_num, c->vi.vol_id, c->vi.name,
-		  c->ro_mount ? ", R/O mode" : "");
-	x = (long long)c->main_lebs * c->leb_size;
-	y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
-	ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
-		  c->leb_size, c->leb_size >> 10, c->min_io_size,
-		  c->max_write_size);
-	ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), max %d LEBs, journal size %lld bytes (%lld MiB, %d LEBs)",
-		  x, x >> 20, c->main_lebs, c->max_leb_cnt,
-		  y, y >> 20, c->log_lebs + c->max_bud_cnt);
-	ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)",
-		  c->report_rp_size, c->report_rp_size >> 10);
-	ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
-		  c->fmt_version, c->ro_compat_version,
-		  UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
-		  c->big_lpt ? ", big LPT model" : ", small LPT model");
-
-	dbg_gen("default compressor:  %s", ubifs_compr_name(c, c->default_compr));
-	dbg_gen("data journal heads:  %d",
-		c->jhead_cnt - NONDATA_JHEADS_CNT);
-	dbg_gen("log LEBs:            %d (%d - %d)",
-		c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
-	dbg_gen("LPT area LEBs:       %d (%d - %d)",
-		c->lpt_lebs, c->lpt_first, c->lpt_last);
-	dbg_gen("orphan area LEBs:    %d (%d - %d)",
-		c->orph_lebs, c->orph_first, c->orph_last);
-	dbg_gen("main area LEBs:      %d (%d - %d)",
-		c->main_lebs, c->main_first, c->leb_cnt - 1);
-	dbg_gen("index LEBs:          %d", c->lst.idx_lebs);
-	dbg_gen("total index bytes:   %llu (%llu KiB, %llu MiB)",
-		c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
-		c->bi.old_idx_sz >> 20);
-	dbg_gen("key hash type:       %d", c->key_hash_type);
-	dbg_gen("tree fanout:         %d", c->fanout);
-	dbg_gen("reserved GC LEB:     %d", c->gc_lnum);
-	dbg_gen("max. znode size      %d", c->max_znode_sz);
-	dbg_gen("max. index node size %d", c->max_idx_node_sz);
-	dbg_gen("node sizes:          data %zu, inode %zu, dentry %zu",
-		UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
-	dbg_gen("node sizes:          trun %zu, sb %zu, master %zu",
-		UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
-	dbg_gen("node sizes:          ref %zu, cmt. start %zu, orph %zu",
-		UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
-	dbg_gen("max. node sizes:     data %zu, inode %zu dentry %zu, idx %d",
-		UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
-		UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
-	dbg_gen("dead watermark:      %d", c->dead_wm);
-	dbg_gen("dark watermark:      %d", c->dark_wm);
-	dbg_gen("LEB overhead:        %d", c->leb_overhead);
-	x = (long long)c->main_lebs * c->dark_wm;
-	dbg_gen("max. dark space:     %lld (%lld KiB, %lld MiB)",
-		x, x >> 10, x >> 20);
-	dbg_gen("maximum bud bytes:   %lld (%lld KiB, %lld MiB)",
-		c->max_bud_bytes, c->max_bud_bytes >> 10,
-		c->max_bud_bytes >> 20);
-	dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
-		c->bg_bud_bytes, c->bg_bud_bytes >> 10,
-		c->bg_bud_bytes >> 20);
-	dbg_gen("current bud bytes    %lld (%lld KiB, %lld MiB)",
-		c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
-	dbg_gen("max. seq. number:    %llu", c->max_sqnum);
-	dbg_gen("commit number:       %llu", c->cmt_no);
-	dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c));
-	dbg_gen("max orphans:           %d", c->max_orphans);
-
-	return 0;
-
-out_infos:
-	spin_lock(&ubifs_infos_lock);
-	list_del(&c->infos_list);
-	spin_unlock(&ubifs_infos_lock);
-out_orphans:
-	free_orphans(c);
-out_journal:
-	destroy_journal(c);
-out_lpt:
-	ubifs_lpt_free(c, 0);
-out_master:
-	kfree(c->mst_node);
-	kfree(c->rcvrd_mst_node);
-	if (c->bgt)
-		kthread_stop(c->bgt);
-out_wbufs:
-	free_wbufs(c);
-out_cbuf:
-	kfree(c->cbuf);
-out_auth:
-	ubifs_exit_authentication(c);
-out_free:
-	kfree(c->write_reserve_buf);
-	kfree(c->bu.buf);
-	vfree(c->ileb_buf);
-	vfree(c->sbuf);
-	kfree(c->bottom_up_buf);
-	kfree(c->sup_node);
-	ubifs_sysfs_unregister(c);
-out_debugging:
-	ubifs_debugging_exit(c);
-	return err;
-}
-
-/**
- * ubifs_umount - un-mount UBIFS file-system.
- * @c: UBIFS file-system description object
- *
- * Note, this function is called to free allocated resourced when un-mounting,
- * as well as free resources when an error occurred while we were half way
- * through mounting (error path cleanup function). So it has to make sure the
- * resource was actually allocated before freeing it.
- */
-static void ubifs_umount(struct ubifs_info *c)
-{
-	dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
-		c->vi.vol_id);
-
-	dbg_debugfs_exit_fs(c);
-	spin_lock(&ubifs_infos_lock);
-	list_del(&c->infos_list);
-	spin_unlock(&ubifs_infos_lock);
-
-	if (c->bgt)
-		kthread_stop(c->bgt);
-
-	destroy_journal(c);
-	free_wbufs(c);
-	free_orphans(c);
-	ubifs_lpt_free(c, 0);
-	ubifs_exit_authentication(c);
-
-	ubifs_release_options(c);
-	kfree(c->cbuf);
-	kfree(c->rcvrd_mst_node);
-	kfree(c->mst_node);
-	kfree(c->write_reserve_buf);
-	kfree(c->bu.buf);
-	vfree(c->ileb_buf);
-	vfree(c->sbuf);
-	kfree(c->bottom_up_buf);
-	kfree(c->sup_node);
-	ubifs_debugging_exit(c);
-	ubifs_sysfs_unregister(c);
-}
-
-/**
- * ubifs_remount_rw - re-mount in read-write mode.
- * @c: UBIFS file-system description object
- *
- * UBIFS avoids allocating many unnecessary resources when mounted in read-only
- * mode. This function allocates the needed resources and re-mounts UBIFS in
- * read-write mode.
- */
-static int ubifs_remount_rw(struct ubifs_info *c)
-{
-	int err, lnum;
-
-	if (c->rw_incompat) {
-		ubifs_err(c, "the file-system is not R/W-compatible");
-		ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
-			  c->fmt_version, c->ro_compat_version,
-			  UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
-		return -EROFS;
-	}
-
-	mutex_lock(&c->umount_mutex);
-	dbg_save_space_info(c);
-	c->remounting_rw = 1;
-	c->ro_mount = 0;
-
-	if (c->space_fixup) {
-		err = ubifs_fixup_free_space(c);
-		if (err)
-			goto out;
-	}
-
-	err = check_free_space(c);
-	if (err)
-		goto out;
-
-	if (c->need_recovery) {
-		ubifs_msg(c, "completing deferred recovery");
-		err = ubifs_write_rcvrd_mst_node(c);
-		if (err)
-			goto out;
-		if (!ubifs_authenticated(c)) {
-			err = ubifs_recover_size(c, true);
-			if (err)
-				goto out;
-		}
-		err = ubifs_clean_lebs(c, c->sbuf);
-		if (err)
-			goto out;
-		err = ubifs_recover_inl_heads(c, c->sbuf);
-		if (err)
-			goto out;
-	} else {
-		/* A readonly mount is not allowed to have orphans */
-		ubifs_assert(c, c->tot_orphans == 0);
-		err = ubifs_clear_orphans(c);
-		if (err)
-			goto out;
-	}
-
-	if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
-		c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
-		err = ubifs_write_master(c);
-		if (err)
-			goto out;
-	}
-
-	if (c->superblock_need_write) {
-		struct ubifs_sb_node *sup = c->sup_node;
-
-		err = ubifs_write_sb_node(c, sup);
-		if (err)
-			goto out;
-
-		c->superblock_need_write = 0;
-	}
-
-	c->ileb_buf = vmalloc(c->leb_size);
-	if (!c->ileb_buf) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
-				       UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL);
-	if (!c->write_reserve_buf) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	err = ubifs_lpt_init(c, 0, 1);
-	if (err)
-		goto out;
-
-	/* Create background thread */
-	c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name);
-	if (IS_ERR(c->bgt)) {
-		err = PTR_ERR(c->bgt);
-		c->bgt = NULL;
-		ubifs_err(c, "cannot spawn \"%s\", error %d",
-			  c->bgt_name, err);
-		goto out;
-	}
-
-	c->orph_buf = vmalloc(c->leb_size);
-	if (!c->orph_buf) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	/* Check for enough log space */
-	lnum = c->lhead_lnum + 1;
-	if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
-		lnum = UBIFS_LOG_LNUM;
-	if (lnum == c->ltail_lnum) {
-		err = ubifs_consolidate_log(c);
-		if (err)
-			goto out;
-	}
-
-	if (c->need_recovery) {
-		err = ubifs_rcvry_gc_commit(c);
-		if (err)
-			goto out;
-
-		if (ubifs_authenticated(c)) {
-			err = ubifs_recover_size(c, false);
-			if (err)
-				goto out;
-		}
-	} else {
-		err = ubifs_leb_unmap(c, c->gc_lnum);
-	}
-	if (err)
-		goto out;
-
-	dbg_gen("re-mounted read-write");
-	c->remounting_rw = 0;
-
-	if (c->need_recovery) {
-		c->need_recovery = 0;
-		ubifs_msg(c, "deferred recovery completed");
-	} else {
-		/*
-		 * Do not run the debugging space check if the were doing
-		 * recovery, because when we saved the information we had the
-		 * file-system in a state where the TNC and lprops has been
-		 * modified in memory, but all the I/O operations (including a
-		 * commit) were deferred. So the file-system was in
-		 * "non-committed" state. Now the file-system is in committed
-		 * state, and of course the amount of free space will change
-		 * because, for example, the old index size was imprecise.
-		 */
-		err = dbg_check_space_info(c);
-	}
-
-	mutex_unlock(&c->umount_mutex);
-	return err;
-
-out:
-	c->ro_mount = 1;
-	vfree(c->orph_buf);
-	c->orph_buf = NULL;
-	if (c->bgt) {
-		kthread_stop(c->bgt);
-		c->bgt = NULL;
-	}
-	kfree(c->write_reserve_buf);
-	c->write_reserve_buf = NULL;
-	vfree(c->ileb_buf);
-	c->ileb_buf = NULL;
-	ubifs_lpt_free(c, 1);
-	c->remounting_rw = 0;
-	mutex_unlock(&c->umount_mutex);
-	return err;
-}
-
-/**
- * ubifs_remount_ro - re-mount in read-only mode.
- * @c: UBIFS file-system description object
- *
- * We assume VFS has stopped writing. Possibly the background thread could be
- * running a commit, however kthread_stop will wait in that case.
- */
-static void ubifs_remount_ro(struct ubifs_info *c)
-{
-	int i, err;
-
-	ubifs_assert(c, !c->need_recovery);
-	ubifs_assert(c, !c->ro_mount);
-
-	mutex_lock(&c->umount_mutex);
-	if (c->bgt) {
-		kthread_stop(c->bgt);
-		c->bgt = NULL;
-	}
-
-	dbg_save_space_info(c);
-
-	for (i = 0; i < c->jhead_cnt; i++) {
-		err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
-		if (err)
-			ubifs_ro_mode(c, err);
-	}
-
-	c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
-	c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
-	c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
-	err = ubifs_write_master(c);
-	if (err)
-		ubifs_ro_mode(c, err);
-
-	vfree(c->orph_buf);
-	c->orph_buf = NULL;
-	kfree(c->write_reserve_buf);
-	c->write_reserve_buf = NULL;
-	vfree(c->ileb_buf);
-	c->ileb_buf = NULL;
-	ubifs_lpt_free(c, 1);
-	c->ro_mount = 1;
-	err = dbg_check_space_info(c);
-	if (err)
-		ubifs_ro_mode(c, err);
-	mutex_unlock(&c->umount_mutex);
-}
-
-static void ubifs_put_super(struct super_block *sb)
-{
-	int i;
-	struct ubifs_info *c = sb->s_fs_info;
-
-	ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num);
-
-	/*
-	 * The following asserts are only valid if there has not been a failure
-	 * of the media. For example, there will be dirty inodes if we failed
-	 * to write them back because of I/O errors.
-	 */
-	if (!c->ro_error) {
-		ubifs_assert(c, c->bi.idx_growth == 0);
-		ubifs_assert(c, c->bi.dd_growth == 0);
-		ubifs_assert(c, c->bi.data_growth == 0);
-	}
-
-	/*
-	 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
-	 * and file system un-mount. Namely, it prevents the shrinker from
-	 * picking this superblock for shrinking - it will be just skipped if
-	 * the mutex is locked.
-	 */
-	mutex_lock(&c->umount_mutex);
-	if (!c->ro_mount) {
-		/*
-		 * First of all kill the background thread to make sure it does
-		 * not interfere with un-mounting and freeing resources.
-		 */
-		if (c->bgt) {
-			kthread_stop(c->bgt);
-			c->bgt = NULL;
-		}
-
-		/*
-		 * On fatal errors c->ro_error is set to 1, in which case we do
-		 * not write the master node.
-		 */
-		if (!c->ro_error) {
-			int err;
-
-			/* Synchronize write-buffers */
-			for (i = 0; i < c->jhead_cnt; i++) {
-				err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
-				if (err)
-					ubifs_ro_mode(c, err);
-			}
-
-			/*
-			 * We are being cleanly unmounted which means the
-			 * orphans were killed - indicate this in the master
-			 * node. Also save the reserved GC LEB number.
-			 */
-			c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
-			c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
-			c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
-			err = ubifs_write_master(c);
-			if (err)
-				/*
-				 * Recovery will attempt to fix the master area
-				 * next mount, so we just print a message and
-				 * continue to unmount normally.
-				 */
-				ubifs_err(c, "failed to write master node, error %d",
-					  err);
-		} else {
-			for (i = 0; i < c->jhead_cnt; i++)
-				/* Make sure write-buffer timers are canceled */
-				hrtimer_cancel(&c->jheads[i].wbuf.timer);
-		}
-	}
-
-	ubifs_umount(c);
-	ubi_close_volume(c->ubi);
-	mutex_unlock(&c->umount_mutex);
-}
-
-static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
-	int err;
-	struct ubifs_info *c = sb->s_fs_info;
-
-	sync_filesystem(sb);
-	dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
-
-	err = ubifs_parse_options(c, data, 1);
-	if (err) {
-		ubifs_err(c, "invalid or unknown remount parameter");
-		return err;
-	}
-
-	if (c->ro_mount && !(*flags & SB_RDONLY)) {
-		if (c->ro_error) {
-			ubifs_msg(c, "cannot re-mount R/W due to prior errors");
-			return -EROFS;
-		}
-		if (c->ro_media) {
-			ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O");
-			return -EROFS;
-		}
-		err = ubifs_remount_rw(c);
-		if (err)
-			return err;
-	} else if (!c->ro_mount && (*flags & SB_RDONLY)) {
-		if (c->ro_error) {
-			ubifs_msg(c, "cannot re-mount R/O due to prior errors");
-			return -EROFS;
-		}
-		ubifs_remount_ro(c);
-	}
-
-	if (c->bulk_read == 1)
-		bu_init(c);
-	else {
-		dbg_gen("disable bulk-read");
-		mutex_lock(&c->bu_mutex);
-		kfree(c->bu.buf);
-		c->bu.buf = NULL;
-		mutex_unlock(&c->bu_mutex);
-	}
-
-	if (!c->need_recovery)
-		ubifs_assert(c, c->lst.taken_empty_lebs > 0);
-
-	return 0;
-}
-
-const struct super_operations ubifs_super_operations = {
-	.alloc_inode   = ubifs_alloc_inode,
-	.free_inode    = ubifs_free_inode,
-	.put_super     = ubifs_put_super,
-	.write_inode   = ubifs_write_inode,
-	.drop_inode    = ubifs_drop_inode,
-	.evict_inode   = ubifs_evict_inode,
-	.statfs        = ubifs_statfs,
-	.dirty_inode   = ubifs_dirty_inode,
-	.remount_fs    = ubifs_remount_fs,
-	.show_options  = ubifs_show_options,
-	.sync_fs       = ubifs_sync_fs,
-};
-
-/**
- * open_ubi - parse UBI device name string and open the UBI device.
- * @name: UBI volume name
- * @mode: UBI volume open mode
- *
- * The primary method of mounting UBIFS is by specifying the UBI volume
- * character device node path. However, UBIFS may also be mounted without any
- * character device node using one of the following methods:
- *
- * o ubiX_Y    - mount UBI device number X, volume Y;
- * o ubiY      - mount UBI device number 0, volume Y;
- * o ubiX:NAME - mount UBI device X, volume with name NAME;
- * o ubi:NAME  - mount UBI device 0, volume with name NAME.
- *
- * Alternative '!' separator may be used instead of ':' (because some shells
- * like busybox may interpret ':' as an NFS host name separator). This function
- * returns UBI volume description object in case of success and a negative
- * error code in case of failure.
- */
-static struct ubi_volume_desc *open_ubi(const char *name, int mode)
-{
-	struct ubi_volume_desc *ubi;
-	int dev, vol;
-	char *endptr;
-
-	if (!name || !*name)
-		return ERR_PTR(-EINVAL);
-
-	/* First, try to open using the device node path method */
-	ubi = ubi_open_volume_path(name, mode);
-	if (!IS_ERR(ubi))
-		return ubi;
-
-	/* Try the "nodev" method */
-	if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
-		return ERR_PTR(-EINVAL);
-
-	/* ubi:NAME method */
-	if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
-		return ubi_open_volume_nm(0, name + 4, mode);
-
-	if (!isdigit(name[3]))
-		return ERR_PTR(-EINVAL);
-
-	dev = simple_strtoul(name + 3, &endptr, 0);
-
-	/* ubiY method */
-	if (*endptr == '\0')
-		return ubi_open_volume(0, dev, mode);
-
-	/* ubiX_Y method */
-	if (*endptr == '_' && isdigit(endptr[1])) {
-		vol = simple_strtoul(endptr + 1, &endptr, 0);
-		if (*endptr != '\0')
-			return ERR_PTR(-EINVAL);
-		return ubi_open_volume(dev, vol, mode);
-	}
-
-	/* ubiX:NAME method */
-	if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
-		return ubi_open_volume_nm(dev, ++endptr, mode);
-
-	return ERR_PTR(-EINVAL);
-}
-
-static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
-{
-	struct ubifs_info *c;
-
-	c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
-	if (c) {
-		spin_lock_init(&c->cnt_lock);
-		spin_lock_init(&c->cs_lock);
-		spin_lock_init(&c->buds_lock);
-		spin_lock_init(&c->space_lock);
-		spin_lock_init(&c->orphan_lock);
-		init_rwsem(&c->commit_sem);
-		mutex_init(&c->lp_mutex);
-		mutex_init(&c->tnc_mutex);
-		mutex_init(&c->log_mutex);
-		mutex_init(&c->umount_mutex);
-		mutex_init(&c->bu_mutex);
-		mutex_init(&c->write_reserve_mutex);
-		init_waitqueue_head(&c->cmt_wq);
-		c->buds = RB_ROOT;
-		c->old_idx = RB_ROOT;
-		c->size_tree = RB_ROOT;
-		c->orph_tree = RB_ROOT;
-		INIT_LIST_HEAD(&c->infos_list);
-		INIT_LIST_HEAD(&c->idx_gc);
-		INIT_LIST_HEAD(&c->replay_list);
-		INIT_LIST_HEAD(&c->replay_buds);
-		INIT_LIST_HEAD(&c->uncat_list);
-		INIT_LIST_HEAD(&c->empty_list);
-		INIT_LIST_HEAD(&c->freeable_list);
-		INIT_LIST_HEAD(&c->frdi_idx_list);
-		INIT_LIST_HEAD(&c->unclean_leb_list);
-		INIT_LIST_HEAD(&c->old_buds);
-		INIT_LIST_HEAD(&c->orph_list);
-		INIT_LIST_HEAD(&c->orph_new);
-		c->no_chk_data_crc = 1;
-		c->assert_action = ASSACT_RO;
-
-		c->highest_inum = UBIFS_FIRST_INO;
-		c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
-
-		ubi_get_volume_info(ubi, &c->vi);
-		ubi_get_device_info(c->vi.ubi_num, &c->di);
-	}
-	return c;
-}
-
-static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
-{
-	struct ubifs_info *c = sb->s_fs_info;
-	struct inode *root;
-	int err;
-
-	c->vfs_sb = sb;
-	/* Re-open the UBI device in read-write mode */
-	c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
-	if (IS_ERR(c->ubi)) {
-		err = PTR_ERR(c->ubi);
-		goto out;
-	}
-
-	err = ubifs_parse_options(c, data, 0);
-	if (err)
-		goto out_close;
-
-	/*
-	 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
-	 * UBIFS, I/O is not deferred, it is done immediately in read_folio,
-	 * which means the user would have to wait not just for their own I/O
-	 * but the read-ahead I/O as well i.e. completely pointless.
-	 *
-	 * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also
-	 * @sb->s_bdi->capabilities are initialized to 0 so there won't be any
-	 * writeback happening.
-	 */
-	err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num,
-				   c->vi.vol_id);
-	if (err)
-		goto out_close;
-	sb->s_bdi->ra_pages = 0;
-	sb->s_bdi->io_pages = 0;
-
-	sb->s_fs_info = c;
-	sb->s_magic = UBIFS_SUPER_MAGIC;
-	sb->s_blocksize = UBIFS_BLOCK_SIZE;
-	sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
-	sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
-	if (c->max_inode_sz > MAX_LFS_FILESIZE)
-		sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
-	sb->s_op = &ubifs_super_operations;
-	sb->s_xattr = ubifs_xattr_handlers;
-	fscrypt_set_ops(sb, &ubifs_crypt_operations);
-
-	mutex_lock(&c->umount_mutex);
-	err = mount_ubifs(c);
-	if (err) {
-		ubifs_assert(c, err < 0);
-		goto out_unlock;
-	}
-
-	/* Read the root inode */
-	root = ubifs_iget(sb, UBIFS_ROOT_INO);
-	if (IS_ERR(root)) {
-		err = PTR_ERR(root);
-		goto out_umount;
-	}
-
-	sb->s_root = d_make_root(root);
-	if (!sb->s_root) {
-		err = -ENOMEM;
-		goto out_umount;
-	}
-
-	import_uuid(&sb->s_uuid, c->uuid);
-
-	mutex_unlock(&c->umount_mutex);
-	return 0;
-
-out_umount:
-	ubifs_umount(c);
-out_unlock:
-	mutex_unlock(&c->umount_mutex);
-out_close:
-	ubifs_release_options(c);
-	ubi_close_volume(c->ubi);
-out:
-	return err;
-}
-
-static int sb_test(struct super_block *sb, void *data)
-{
-	struct ubifs_info *c1 = data;
-	struct ubifs_info *c = sb->s_fs_info;
-
-	return c->vi.cdev == c1->vi.cdev;
-}
-
-static int sb_set(struct super_block *sb, void *data)
-{
-	sb->s_fs_info = data;
-	return set_anon_super(sb, NULL);
-}
-
-static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
-			const char *name, void *data)
-{
-	struct ubi_volume_desc *ubi;
-	struct ubifs_info *c;
-	struct super_block *sb;
-	int err;
-
-	dbg_gen("name %s, flags %#x", name, flags);
-
-	/*
-	 * Get UBI device number and volume ID. Mount it read-only so far
-	 * because this might be a new mount point, and UBI allows only one
-	 * read-write user at a time.
-	 */
-	ubi = open_ubi(name, UBI_READONLY);
-	if (IS_ERR(ubi)) {
-		if (!(flags & SB_SILENT))
-			pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
-			       current->pid, name, (int)PTR_ERR(ubi));
-		return ERR_CAST(ubi);
-	}
-
-	c = alloc_ubifs_info(ubi);
-	if (!c) {
-		err = -ENOMEM;
-		goto out_close;
-	}
-
-	dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
-
-	sb = sget(fs_type, sb_test, sb_set, flags, c);
-	if (IS_ERR(sb)) {
-		err = PTR_ERR(sb);
-		kfree(c);
-		goto out_close;
-	}
-
-	if (sb->s_root) {
-		struct ubifs_info *c1 = sb->s_fs_info;
-		kfree(c);
-		/* A new mount point for already mounted UBIFS */
-		dbg_gen("this ubi volume is already mounted");
-		if (!!(flags & SB_RDONLY) != c1->ro_mount) {
-			err = -EBUSY;
-			goto out_deact;
-		}
-	} else {
-		err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
-		if (err)
-			goto out_deact;
-		/* We do not support atime */
-		sb->s_flags |= SB_ACTIVE;
-		if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
-			ubifs_msg(c, "full atime support is enabled.");
-		else
-			sb->s_flags |= SB_NOATIME;
-	}
-
-	/* 'fill_super()' opens ubi again so we must close it here */
-	ubi_close_volume(ubi);
-
-	return dget(sb->s_root);
-
-out_deact:
-	deactivate_locked_super(sb);
-out_close:
-	ubi_close_volume(ubi);
-	return ERR_PTR(err);
-}
-
-static void kill_ubifs_super(struct super_block *s)
-{
-	struct ubifs_info *c = s->s_fs_info;
-	kill_anon_super(s);
-	kfree(c);
-}
-
-static struct file_system_type ubifs_fs_type = {
-	.name    = "ubifs",
-	.owner   = THIS_MODULE,
-	.mount   = ubifs_mount,
-	.kill_sb = kill_ubifs_super,
-};
-MODULE_ALIAS_FS("ubifs");
-
-/*
- * Inode slab cache constructor.
- */
-static void inode_slab_ctor(void *obj)
-{
-	struct ubifs_inode *ui = obj;
-	inode_init_once(&ui->vfs_inode);
-}
-
-static int __init ubifs_init(void)
-{
-	int err = -ENOMEM;
-
-	BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
-
-	/* Make sure node sizes are 8-byte aligned */
-	BUILD_BUG_ON(UBIFS_CH_SZ        & 7);
-	BUILD_BUG_ON(UBIFS_INO_NODE_SZ  & 7);
-	BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
-	BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
-	BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
-	BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
-	BUILD_BUG_ON(UBIFS_SB_NODE_SZ   & 7);
-	BUILD_BUG_ON(UBIFS_MST_NODE_SZ  & 7);
-	BUILD_BUG_ON(UBIFS_REF_NODE_SZ  & 7);
-	BUILD_BUG_ON(UBIFS_CS_NODE_SZ   & 7);
-	BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
-
-	BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
-	BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
-	BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
-	BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ  & 7);
-	BUILD_BUG_ON(UBIFS_MAX_NODE_SZ      & 7);
-	BUILD_BUG_ON(MIN_WRITE_SZ           & 7);
-
-	/* Check min. node size */
-	BUILD_BUG_ON(UBIFS_INO_NODE_SZ  < MIN_WRITE_SZ);
-	BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
-	BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
-	BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
-
-	BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
-	BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
-	BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
-	BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ  > UBIFS_MAX_NODE_SZ);
-
-	/* Defined node sizes */
-	BUILD_BUG_ON(UBIFS_SB_NODE_SZ  != 4096);
-	BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
-	BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
-	BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
-
-	/*
-	 * We use 2 bit wide bit-fields to store compression type, which should
-	 * be amended if more compressors are added. The bit-fields are:
-	 * @compr_type in 'struct ubifs_inode', @default_compr in
-	 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
-	 */
-	BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
-
-	/*
-	 * We require that PAGE_SIZE is greater-than-or-equal-to
-	 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
-	 */
-	if (PAGE_SIZE < UBIFS_BLOCK_SIZE) {
-		pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
-		       current->pid, (unsigned int)PAGE_SIZE);
-		return -EINVAL;
-	}
-
-	ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
-				sizeof(struct ubifs_inode), 0,
-				SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT |
-				SLAB_ACCOUNT, &inode_slab_ctor);
-	if (!ubifs_inode_slab)
-		return -ENOMEM;
-
-	ubifs_shrinker_info = shrinker_alloc(0, "ubifs-slab");
-	if (!ubifs_shrinker_info)
-		goto out_slab;
-
-	ubifs_shrinker_info->count_objects = ubifs_shrink_count;
-	ubifs_shrinker_info->scan_objects = ubifs_shrink_scan;
-
-	shrinker_register(ubifs_shrinker_info);
-
-	err = ubifs_compressors_init();
-	if (err)
-		goto out_shrinker;
-
-	dbg_debugfs_init();
-
-	err = ubifs_sysfs_init();
-	if (err)
-		goto out_dbg;
-
-	err = register_filesystem(&ubifs_fs_type);
-	if (err) {
-		pr_err("UBIFS error (pid %d): cannot register file system, error %d",
-		       current->pid, err);
-		goto out_sysfs;
-	}
-	return 0;
-
-out_sysfs:
-	ubifs_sysfs_exit();
-out_dbg:
-	dbg_debugfs_exit();
-	ubifs_compressors_exit();
-out_shrinker:
-	shrinker_free(ubifs_shrinker_info);
-out_slab:
-	kmem_cache_destroy(ubifs_inode_slab);
-	return err;
-}
-/* late_initcall to let compressors initialize first */
-late_initcall(ubifs_init);
-
-static void __exit ubifs_exit(void)
-{
-	WARN_ON(!list_empty(&ubifs_infos));
-	WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0);
-
-	dbg_debugfs_exit();
-	ubifs_sysfs_exit();
-	ubifs_compressors_exit();
-	shrinker_free(ubifs_shrinker_info);
-
-	/*
-	 * Make sure all delayed rcu free inodes are flushed before we
-	 * destroy cache.
-	 */
-	rcu_barrier();
-	kmem_cache_destroy(ubifs_inode_slab);
-	unregister_filesystem(&ubifs_fs_type);
-}
-module_exit(ubifs_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_VERSION(__stringify(UBIFS_VERSION));
-MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
-MODULE_DESCRIPTION("UBIFS - UBI File System");
-- 
2.13.6