1 files changed, 0 insertions, 1038 deletions

diff --git a/exfat/node.c b/exfat/node.c
deleted file mode 100644
index d5104038e..000000000
--- a/exfat/node.c
+++ /dev/null
@@ -1,1038 +0,0 @@
-/*
-	node.c (09.10.09)
-	exFAT file system implementation library.
-
-	Copyright (C) 2010-2012  Andrew Nayenko
-
-	This program is free software: you can redistribute it and/or modify
-	it under the terms of the GNU General Public License as published by
-	the Free Software Foundation, either version 3 of the License, or
-	(at your option) any later version.
-
-	This program is distributed in the hope that it will be useful,
-	but WITHOUT ANY WARRANTY; without even the implied warranty of
-	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-	GNU General Public License for more details.
-
-	You should have received a copy of the GNU General Public License
-	along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "exfat.h"
-#include <errno.h>
-#include <string.h>
-#include <inttypes.h>
-
-/* on-disk nodes iterator */
-struct iterator
-{
-	cluster_t cluster;
-	off64_t offset;
-	int contiguous;
-	char* chunk;
-};
-
-struct exfat_node* exfat_get_node(struct exfat_node* node)
-{
-	/* if we switch to multi-threaded mode we will need atomic
-	   increment here and atomic decrement in exfat_put_node() */
-	node->references++;
-	return node;
-}
-
-void exfat_put_node(struct exfat* ef, struct exfat_node* node)
-{
-	if (--node->references < 0)
-	{
-		char buffer[EXFAT_NAME_MAX + 1];
-		exfat_get_name(node, buffer, EXFAT_NAME_MAX);
-		exfat_bug("reference counter of `%s' is below zero", buffer);
-	}
-
-	if (node->references == 0)
-	{
-		if (node->flags & EXFAT_ATTRIB_DIRTY)
-			exfat_flush_node(ef, node);
-		if (node->flags & EXFAT_ATTRIB_UNLINKED)
-		{
-			/* free all clusters and node structure itself */
-			exfat_truncate(ef, node, 0);
-			free(node);
-		}
-		if (ef->cmap.dirty)
-			exfat_flush_cmap(ef);
-	}
-}
-
-/**
- * Cluster + offset from the beginning of the directory to absolute offset.
- */
-static off64_t co2o(struct exfat* ef, cluster_t cluster, off64_t offset)
-{
-	return exfat_c2o(ef, cluster) + offset % CLUSTER_SIZE(*ef->sb);
-}
-
-static int opendir(struct exfat* ef, const struct exfat_node* dir,
-		struct iterator* it)
-{
-	if (!(dir->flags & EXFAT_ATTRIB_DIR))
-		exfat_bug("not a directory");
-	it->cluster = dir->start_cluster;
-	it->offset = 0;
-	it->contiguous = IS_CONTIGUOUS(*dir);
-	it->chunk = malloc(CLUSTER_SIZE(*ef->sb));
-	if (it->chunk == NULL)
-	{
-		exfat_error("out of memory");
-		return -ENOMEM;
-	}
-	exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
-			exfat_c2o(ef, it->cluster));
-	return 0;
-}
-
-static void closedir(struct iterator* it)
-{
-	it->cluster = 0;
-	it->offset = 0;
-	it->contiguous = 0;
-	free(it->chunk);
-	it->chunk = NULL;
-}
-
-static int fetch_next_entry(struct exfat* ef, const struct exfat_node* parent,
-		struct iterator* it)
-{
-	/* move iterator to the next entry in the directory */
-	it->offset += sizeof(struct exfat_entry);
-	/* fetch the next cluster if needed */
-	if ((it->offset & (CLUSTER_SIZE(*ef->sb) - 1)) == 0)
-	{
-		/* reached the end of directory; the caller should check this
-		   condition too */
-		if (it->offset >= parent->size)
-			return 0;
-		it->cluster = exfat_next_cluster(ef, parent, it->cluster);
-		if (CLUSTER_INVALID(it->cluster))
-		{
-			exfat_error("invalid cluster 0x%x while reading directory",
-					it->cluster);
-			return 1;
-		}
-		exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
-				exfat_c2o(ef, it->cluster));
-	}
-	return 0;
-}
-
-static struct exfat_node* allocate_node(void)
-{
-	struct exfat_node* node = malloc(sizeof(struct exfat_node));
-	if (node == NULL)
-	{
-		exfat_error("failed to allocate node");
-		return NULL;
-	}
-	memset(node, 0, sizeof(struct exfat_node));
-	return node;
-}
-
-static void init_node_meta1(struct exfat_node* node,
-		const struct exfat_entry_meta1* meta1)
-{
-	node->flags = le16_to_cpu(meta1->attrib);
-	node->mtime = exfat_exfat2unix(meta1->mdate, meta1->mtime,
-			meta1->mtime_cs);
-	/* there is no centiseconds field for atime */
-	node->atime = exfat_exfat2unix(meta1->adate, meta1->atime, 0);
-}
-
-static void init_node_meta2(struct exfat_node* node,
-		const struct exfat_entry_meta2* meta2)
-{
-	node->size = le64_to_cpu(meta2->size);
-	node->start_cluster = le32_to_cpu(meta2->start_cluster);
-	node->fptr_cluster = node->start_cluster;
-	if (meta2->flags & EXFAT_FLAG_CONTIGUOUS)
-		node->flags |= EXFAT_ATTRIB_CONTIGUOUS;
-}
-
-static const struct exfat_entry* get_entry_ptr(const struct exfat* ef,
-		const struct iterator* it)
-{
-	return (const struct exfat_entry*)
-			(it->chunk + it->offset % CLUSTER_SIZE(*ef->sb));
-}
-
-/*
- * Reads one entry in directory at position pointed by iterator and fills
- * node structure.
- */
-static int readdir(struct exfat* ef, const struct exfat_node* parent,
-		struct exfat_node** node, struct iterator* it)
-{
-	int rc = -EIO;
-	const struct exfat_entry* entry;
-	const struct exfat_entry_meta1* meta1;
-	const struct exfat_entry_meta2* meta2;
-	const struct exfat_entry_name* file_name;
-	const struct exfat_entry_upcase* upcase;
-	const struct exfat_entry_bitmap* bitmap;
-	const struct exfat_entry_label* label;
-	uint8_t continuations = 0;
-	le16_t* namep = NULL;
-	uint16_t reference_checksum = 0;
-	uint16_t actual_checksum = 0;
-	uint64_t real_size = 0;
-
-	*node = NULL;
-
-	for (;;)
-	{
-		if (it->offset >= parent->size)
-		{
-			if (continuations != 0)
-			{
-				exfat_error("expected %hhu continuations", continuations);
-				goto error;
-			}
-			return -ENOENT; /* that's OK, means end of directory */
-		}
-
-		entry = get_entry_ptr(ef, it);
-		switch (entry->type)
-		{
-		case EXFAT_ENTRY_FILE:
-			if (continuations != 0)
-			{
-				exfat_error("expected %hhu continuations before new entry",
-						continuations);
-				goto error;
-			}
-			meta1 = (const struct exfat_entry_meta1*) entry;
-			continuations = meta1->continuations;
-			/* each file entry must have at least 2 continuations:
-			   info and name */
-			if (continuations < 2)
-			{
-				exfat_error("too few continuations (%hhu)", continuations);
-				goto error;
-			}
-			reference_checksum = le16_to_cpu(meta1->checksum);
-			actual_checksum = exfat_start_checksum(meta1);
-			*node = allocate_node();
-			if (*node == NULL)
-			{
-				rc = -ENOMEM;
-				goto error;
-			}
-			/* new node has zero reference counter */
-			(*node)->entry_cluster = it->cluster;
-			(*node)->entry_offset = it->offset;
-			init_node_meta1(*node, meta1);
-			namep = (*node)->name;
-			break;
-
-		case EXFAT_ENTRY_FILE_INFO:
-			if (continuations < 2)
-			{
-				exfat_error("unexpected continuation (%hhu)",
-						continuations);
-				goto error;
-			}
-			meta2 = (const struct exfat_entry_meta2*) entry;
-			if (meta2->flags & ~(EXFAT_FLAG_ALWAYS1 | EXFAT_FLAG_CONTIGUOUS))
-			{
-				exfat_error("unknown flags in meta2 (0x%hhx)", meta2->flags);
-				goto error;
-			}
-			init_node_meta2(*node, meta2);
-			actual_checksum = exfat_add_checksum(entry, actual_checksum);
-			real_size = le64_to_cpu(meta2->real_size);
-			/* empty files must be marked as non-contiguous */
-			if ((*node)->size == 0 && (meta2->flags & EXFAT_FLAG_CONTIGUOUS))
-			{
-				exfat_error("empty file marked as contiguous (0x%hhx)",
-						meta2->flags);
-				goto error;
-			}
-			/* directories must be aligned on at cluster boundary */
-			if (((*node)->flags & EXFAT_ATTRIB_DIR) &&
-				(*node)->size % CLUSTER_SIZE(*ef->sb) != 0)
-			{
-				exfat_error("directory has invalid size %"PRIu64" bytes",
-						(*node)->size);
-				goto error;
-			}
-			--continuations;
-			break;
-
-		case EXFAT_ENTRY_FILE_NAME:
-			if (continuations == 0)
-			{
-				exfat_error("unexpected continuation");
-				goto error;
-			}
-			file_name = (const struct exfat_entry_name*) entry;
-			actual_checksum = exfat_add_checksum(entry, actual_checksum);
-
-			memcpy(namep, file_name->name, EXFAT_ENAME_MAX * sizeof(le16_t));
-			namep += EXFAT_ENAME_MAX;
-			if (--continuations == 0)
-			{
-				/*
-				   There are two fields that contain file size. Maybe they
-				   plan to add compression support in the future and one of
-				   those fields is visible (uncompressed) size and the other
-				   is real (compressed) size. Anyway, currently it looks like
-				   exFAT does not support compression and both fields must be
-				   equal.
-
-				   There is an exception though: pagefile.sys (its real_size
-				   is always 0).
-				*/
-				if (real_size != (*node)->size)
-				{
-					char buffer[EXFAT_NAME_MAX + 1];
-
-					exfat_get_name(*node, buffer, EXFAT_NAME_MAX);
-					exfat_error("`%s' real size does not equal to size "
-							"(%"PRIu64" != %"PRIu64")", buffer,
-							real_size, (*node)->size);
-					goto error;
-				}
-				if (actual_checksum != reference_checksum)
-				{
-					char buffer[EXFAT_NAME_MAX + 1];
-
-					exfat_get_name(*node, buffer, EXFAT_NAME_MAX);
-					exfat_error("`%s' has invalid checksum (0x%hx != 0x%hx)",
-							buffer, actual_checksum, reference_checksum);
-					goto error;
-				}
-				if (fetch_next_entry(ef, parent, it) != 0)
-					goto error;
-				return 0; /* entry completed */
-			}
-			break;
-
-		case EXFAT_ENTRY_UPCASE:
-			if (ef->upcase != NULL)
-				break;
-			upcase = (const struct exfat_entry_upcase*) entry;
-			if (CLUSTER_INVALID(le32_to_cpu(upcase->start_cluster)))
-			{
-				exfat_error("invalid cluster 0x%x in upcase table",
-						le32_to_cpu(upcase->start_cluster));
-				goto error;
-			}
-			if (le64_to_cpu(upcase->size) == 0 ||
-				le64_to_cpu(upcase->size) > 0xffff * sizeof(uint16_t) ||
-				le64_to_cpu(upcase->size) % sizeof(uint16_t) != 0)
-			{
-				exfat_error("bad upcase table size (%"PRIu64" bytes)",
-						le64_to_cpu(upcase->size));
-				goto error;
-			}
-			ef->upcase = malloc(le64_to_cpu(upcase->size));
-			if (ef->upcase == NULL)
-			{
-				exfat_error("failed to allocate upcase table (%"PRIu64" bytes)",
-						le64_to_cpu(upcase->size));
-				rc = -ENOMEM;
-				goto error;
-			}
-			ef->upcase_chars = le64_to_cpu(upcase->size) / sizeof(le16_t);
-
-			exfat_pread(ef->dev, ef->upcase, le64_to_cpu(upcase->size),
-					exfat_c2o(ef, le32_to_cpu(upcase->start_cluster)));
-			break;
-
-		case EXFAT_ENTRY_BITMAP:
-			bitmap = (const struct exfat_entry_bitmap*) entry;
-			ef->cmap.start_cluster = le32_to_cpu(bitmap->start_cluster);
-			if (CLUSTER_INVALID(ef->cmap.start_cluster))
-			{
-				exfat_error("invalid cluster 0x%x in clusters bitmap",
-						ef->cmap.start_cluster);
-				goto error;
-			}
-			ef->cmap.size = le32_to_cpu(ef->sb->cluster_count) -
-				EXFAT_FIRST_DATA_CLUSTER;
-			if (le64_to_cpu(bitmap->size) < (ef->cmap.size + 7) / 8)
-			{
-				exfat_error("invalid clusters bitmap size: %"PRIu64
-						" (expected at least %u)",
-						le64_to_cpu(bitmap->size), (ef->cmap.size + 7) / 8);
-				goto error;
-			}
-			/* FIXME bitmap can be rather big, up to 512 MB */
-			ef->cmap.chunk_size = ef->cmap.size;
-			ef->cmap.chunk = malloc(le64_to_cpu(bitmap->size));
-			if (ef->cmap.chunk == NULL)
-			{
-				exfat_error("failed to allocate clusters bitmap chunk "
-						"(%"PRIu64" bytes)", le64_to_cpu(bitmap->size));
-				rc = -ENOMEM;
-				goto error;
-			}
-
-			exfat_pread(ef->dev, ef->cmap.chunk, le64_to_cpu(bitmap->size),
-					exfat_c2o(ef, ef->cmap.start_cluster));
-			break;
-
-		case EXFAT_ENTRY_LABEL:
-			label = (const struct exfat_entry_label*) entry;
-			if (label->length > EXFAT_ENAME_MAX)
-			{
-				exfat_error("too long label (%hhu chars)", label->length);
-				goto error;
-			}
-			if (utf16_to_utf8(ef->label, label->name,
-						sizeof(ef->label), EXFAT_ENAME_MAX) != 0)
-				goto error;
-			break;
-
-		default:
-			if (entry->type & EXFAT_ENTRY_VALID)
-			{
-				exfat_error("unknown entry type 0x%hhx", entry->type);
-				goto error;
-			}
-			break;
-		}
-
-		if (fetch_next_entry(ef, parent, it) != 0)
-			goto error;
-	}
-	/* we never reach here */
-
-error:
-	free(*node);
-	*node = NULL;
-	return rc;
-}
-
-int exfat_cache_directory(struct exfat* ef, struct exfat_node* dir)
-{
-	struct iterator it;
-	int rc;
-	struct exfat_node* node;
-	struct exfat_node* current = NULL;
-
-	if (dir->flags & EXFAT_ATTRIB_CACHED)
-		return 0; /* already cached */
-
-	rc = opendir(ef, dir, &it);
-	if (rc != 0)
-		return rc;
-	while ((rc = readdir(ef, dir, &node, &it)) == 0)
-	{
-		node->parent = dir;
-		if (current != NULL)
-		{
-			current->next = node;
-			node->prev = current;
-		}
-		else
-			dir->child = node;
-
-		current = node;
-	}
-	closedir(&it);
-
-	if (rc != -ENOENT)
-	{
-		/* rollback */
-		for (current = dir->child; current; current = node)
-		{
-			node = current->next;
-			free(current);
-		}
-		dir->child = NULL;
-		return rc;
-	}
-
-	dir->flags |= EXFAT_ATTRIB_CACHED;
-	return 0;
-}
-
-static void tree_attach(struct exfat_node* dir, struct exfat_node* node)
-{
-	node->parent = dir;
-	if (dir->child)
-	{
-		dir->child->prev = node;
-		node->next = dir->child;
-	}
-	dir->child = node;
-}
-
-static void tree_detach(struct exfat_node* node)
-{
-	if (node->prev)
-		node->prev->next = node->next;
-	else /* this is the first node in the list */
-		node->parent->child = node->next;
-	if (node->next)
-		node->next->prev = node->prev;
-	node->parent = NULL;
-	node->prev = NULL;
-	node->next = NULL;
-}
-
-static void reset_cache(struct exfat* ef, struct exfat_node* node)
-{
-	while (node->child)
-	{
-		struct exfat_node* p = node->child;
-		reset_cache(ef, p);
-		tree_detach(p);
-		free(p);
-	}
-	node->flags &= ~EXFAT_ATTRIB_CACHED;
-	if (node->references != 0)
-	{
-		char buffer[EXFAT_NAME_MAX + 1];
-		exfat_get_name(node, buffer, EXFAT_NAME_MAX);
-		exfat_warn("non-zero reference counter (%d) for `%s'",
-				node->references, buffer);
-	}
-	while (node->references)
-		exfat_put_node(ef, node);
-}
-
-void exfat_reset_cache(struct exfat* ef)
-{
-	reset_cache(ef, ef->root);
-}
-
-void next_entry(struct exfat* ef, const struct exfat_node* parent,
-		cluster_t* cluster, off64_t* offset)
-{
-	*offset += sizeof(struct exfat_entry);
-	if (*offset % CLUSTER_SIZE(*ef->sb) == 0)
-		/* next cluster cannot be invalid */
-		*cluster = exfat_next_cluster(ef, parent, *cluster);
-}
-
-void exfat_flush_node(struct exfat* ef, struct exfat_node* node)
-{
-	cluster_t cluster;
-	off64_t offset;
-	off64_t meta1_offset, meta2_offset;
-	struct exfat_entry_meta1 meta1;
-	struct exfat_entry_meta2 meta2;
-
-	if (ef->ro)
-		exfat_bug("unable to flush node to read-only FS");
-
-	if (node->parent == NULL)
-		return; /* do not flush unlinked node */
-
-	cluster = node->entry_cluster;
-	offset = node->entry_offset;
-	meta1_offset = co2o(ef, cluster, offset);
-	next_entry(ef, node->parent, &cluster, &offset);
-	meta2_offset = co2o(ef, cluster, offset);
-
-	exfat_pread(ef->dev, &meta1, sizeof(meta1), meta1_offset);
-	if (meta1.type != EXFAT_ENTRY_FILE)
-		exfat_bug("invalid type of meta1: 0x%hhx", meta1.type);
-	meta1.attrib = cpu_to_le16(node->flags);
-	exfat_unix2exfat(node->mtime, &meta1.mdate, &meta1.mtime, &meta1.mtime_cs);
-	exfat_unix2exfat(node->atime, &meta1.adate, &meta1.atime, NULL);
-
-	exfat_pread(ef->dev, &meta2, sizeof(meta2), meta2_offset);
-	if (meta2.type != EXFAT_ENTRY_FILE_INFO)
-		exfat_bug("invalid type of meta2: 0x%hhx", meta2.type);
-	meta2.size = meta2.real_size = cpu_to_le64(node->size);
-	meta2.start_cluster = cpu_to_le32(node->start_cluster);
-	meta2.flags = EXFAT_FLAG_ALWAYS1;
-	/* empty files must not be marked as contiguous */
-	if (node->size != 0 && IS_CONTIGUOUS(*node))
-		meta2.flags |= EXFAT_FLAG_CONTIGUOUS;
-	/* name hash remains unchanged, no need to recalculate it */
-
-	meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
-
-	exfat_pwrite(ef->dev, &meta1, sizeof(meta1), meta1_offset);
-	exfat_pwrite(ef->dev, &meta2, sizeof(meta2), meta2_offset);
-
-	node->flags &= ~EXFAT_ATTRIB_DIRTY;
-}
-
-static void erase_entry(struct exfat* ef, struct exfat_node* node)
-{
-	cluster_t cluster = node->entry_cluster;
-	off64_t offset = node->entry_offset;
-	int name_entries = DIV_ROUND_UP(utf16_length(node->name), EXFAT_ENAME_MAX);
-	uint8_t entry_type;
-
-	entry_type = EXFAT_ENTRY_FILE & ~EXFAT_ENTRY_VALID;
-	exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
-
-	next_entry(ef, node->parent, &cluster, &offset);
-	entry_type = EXFAT_ENTRY_FILE_INFO & ~EXFAT_ENTRY_VALID;
-	exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
-
-	while (name_entries--)
-	{
-		next_entry(ef, node->parent, &cluster, &offset);
-		entry_type = EXFAT_ENTRY_FILE_NAME & ~EXFAT_ENTRY_VALID;
-		exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
-	}
-}
-
-static int shrink_directory(struct exfat* ef, struct exfat_node* dir,
-		off64_t deleted_offset)
-{
-	const struct exfat_node* node;
-	const struct exfat_node* last_node;
-	uint64_t entries = 0;
-	uint64_t new_size;
-	int rc;
-
-	if (!(dir->flags & EXFAT_ATTRIB_DIR))
-		exfat_bug("attempted to shrink a file");
-	if (!(dir->flags & EXFAT_ATTRIB_CACHED))
-		exfat_bug("attempted to shrink uncached directory");
-
-	for (last_node = node = dir->child; node; node = node->next)
-	{
-		if (deleted_offset < node->entry_offset)
-		{
-			/* there are other entries after the removed one, no way to shrink
-			   this directory */
-			return 0;
-		}
-		if (last_node->entry_offset < node->entry_offset)
-			last_node = node;
-	}
-
-	if (last_node)
-	{
-		/* offset of the last entry */
-		entries += last_node->entry_offset / sizeof(struct exfat_entry);
-		/* two subentries with meta info */
-		entries += 2;
-		/* subentries with file name */
-		entries += DIV_ROUND_UP(utf16_length(last_node->name),
-				EXFAT_ENAME_MAX);
-	}
-
-	new_size = DIV_ROUND_UP(entries * sizeof(struct exfat_entry),
-				 CLUSTER_SIZE(*ef->sb)) * CLUSTER_SIZE(*ef->sb);
-	if (new_size == 0) /* directory always has at least 1 cluster */
-		new_size = CLUSTER_SIZE(*ef->sb);
-	if (new_size == dir->size)
-		return 0;
-	rc = exfat_truncate(ef, dir, new_size);
-	if (rc != 0)
-		return rc;
-	return 0;
-}
-
-static int delete(struct exfat* ef, struct exfat_node* node)
-{
-	struct exfat_node* parent = node->parent;
-	off64_t deleted_offset = node->entry_offset;
-	int rc;
-
-	exfat_get_node(parent);
-	erase_entry(ef, node);
-	exfat_update_mtime(parent);
-	tree_detach(node);
-	rc = shrink_directory(ef, parent, deleted_offset);
-	exfat_put_node(ef, parent);
-	/* file clusters will be freed when node reference counter becomes 0 */
-	node->flags |= EXFAT_ATTRIB_UNLINKED;
-	return rc;
-}
-
-int exfat_unlink(struct exfat* ef, struct exfat_node* node)
-{
-	if (node->flags & EXFAT_ATTRIB_DIR)
-		return -EISDIR;
-	return delete(ef, node);
-}
-
-int exfat_rmdir(struct exfat* ef, struct exfat_node* node)
-{
-	if (!(node->flags & EXFAT_ATTRIB_DIR))
-		return -ENOTDIR;
-	/* check that directory is empty */
-	exfat_cache_directory(ef, node);
-	if (node->child)
-		return -ENOTEMPTY;
-	return delete(ef, node);
-}
-
-static int grow_directory(struct exfat* ef, struct exfat_node* dir,
-		uint64_t asize, uint32_t difference)
-{
-	return exfat_truncate(ef, dir,
-			DIV_ROUND_UP(asize + difference, CLUSTER_SIZE(*ef->sb))
-				* CLUSTER_SIZE(*ef->sb));
-}
-
-static int find_slot(struct exfat* ef, struct exfat_node* dir,
-		cluster_t* cluster, off64_t* offset, int subentries)
-{
-	struct iterator it;
-	int rc;
-	const struct exfat_entry* entry;
-	int contiguous = 0;
-
-	rc = opendir(ef, dir, &it);
-	if (rc != 0)
-		return rc;
-	for (;;)
-	{
-		if (contiguous == 0)
-		{
-			*cluster = it.cluster;
-			*offset = it.offset;
-		}
-		entry = get_entry_ptr(ef, &it);
-		if (entry->type & EXFAT_ENTRY_VALID)
-			contiguous = 0;
-		else
-			contiguous++;
-		if (contiguous == subentries)
-			break;	/* suitable slot is found */
-		if (it.offset + sizeof(struct exfat_entry) >= dir->size)
-		{
-			rc = grow_directory(ef, dir, dir->size,
-					(subentries - contiguous) * sizeof(struct exfat_entry));
-			if (rc != 0)
-			{
-				closedir(&it);
-				return rc;
-			}
-		}
-		if (fetch_next_entry(ef, dir, &it) != 0)
-		{
-			closedir(&it);
-			return -EIO;
-		}
-	}
-	closedir(&it);
-	return 0;
-}
-
-static int write_entry(struct exfat* ef, struct exfat_node* dir,
-		const le16_t* name, cluster_t cluster, off64_t offset, uint16_t attrib)
-{
-	struct exfat_node* node;
-	struct exfat_entry_meta1 meta1;
-	struct exfat_entry_meta2 meta2;
-	const size_t name_length = utf16_length(name);
-	const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
-	int i;
-
-	node = allocate_node();
-	if (node == NULL)
-		return -ENOMEM;
-	node->entry_cluster = cluster;
-	node->entry_offset = offset;
-	memcpy(node->name, name, name_length * sizeof(le16_t));
-
-	memset(&meta1, 0, sizeof(meta1));
-	meta1.type = EXFAT_ENTRY_FILE;
-	meta1.continuations = 1 + name_entries;
-	meta1.attrib = cpu_to_le16(attrib);
-	exfat_unix2exfat(time(NULL), &meta1.crdate, &meta1.crtime,
-			&meta1.crtime_cs);
-	meta1.adate = meta1.mdate = meta1.crdate;
-	meta1.atime = meta1.mtime = meta1.crtime;
-	meta1.mtime_cs = meta1.crtime_cs; /* there is no atime_cs */
-
-	memset(&meta2, 0, sizeof(meta2));
-	meta2.type = EXFAT_ENTRY_FILE_INFO;
-	meta2.flags = EXFAT_FLAG_ALWAYS1;
-	meta2.name_length = name_length;
-	meta2.name_hash = exfat_calc_name_hash(ef, node->name);
-	meta2.start_cluster = cpu_to_le32(EXFAT_CLUSTER_FREE);
-
-	meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
-
-	exfat_pwrite(ef->dev, &meta1, sizeof(meta1), co2o(ef, cluster, offset));
-	next_entry(ef, dir, &cluster, &offset);
-	exfat_pwrite(ef->dev, &meta2, sizeof(meta2), co2o(ef, cluster, offset));
-	for (i = 0; i < name_entries; i++)
-	{
-		struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
-		memcpy(name_entry.name, node->name + i * EXFAT_ENAME_MAX,
-				EXFAT_ENAME_MAX * sizeof(le16_t));
-		next_entry(ef, dir, &cluster, &offset);
-		exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
-				co2o(ef, cluster, offset));
-	}
-
-	init_node_meta1(node, &meta1);
-	init_node_meta2(node, &meta2);
-
-	tree_attach(dir, node);
-	exfat_update_mtime(dir);
-	return 0;
-}
-
-static int create(struct exfat* ef, const char* path, uint16_t attrib)
-{
-	struct exfat_node* dir;
-	struct exfat_node* existing;
-	cluster_t cluster = EXFAT_CLUSTER_BAD;
-	off64_t offset = -1;
-	le16_t name[EXFAT_NAME_MAX + 1];
-	int rc;
-
-	rc = exfat_split(ef, &dir, &existing, name, path);
-	if (rc != 0)
-		return rc;
-	if (existing != NULL)
-	{
-		exfat_put_node(ef, existing);
-		exfat_put_node(ef, dir);
-		return -EEXIST;
-	}
-
-	rc = find_slot(ef, dir, &cluster, &offset,
-			2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
-	if (rc != 0)
-	{
-		exfat_put_node(ef, dir);
-		return rc;
-	}
-	rc = write_entry(ef, dir, name, cluster, offset, attrib);
-	exfat_put_node(ef, dir);
-	return rc;
-}
-
-int exfat_mknod(struct exfat* ef, const char* path)
-{
-	return create(ef, path, EXFAT_ATTRIB_ARCH);
-}
-
-int exfat_mkdir(struct exfat* ef, const char* path)
-{
-	int rc;
-	struct exfat_node* node;
-
-	rc = create(ef, path, EXFAT_ATTRIB_ARCH | EXFAT_ATTRIB_DIR);
-	if (rc != 0)
-		return rc;
-	rc = exfat_lookup(ef, &node, path);
-	if (rc != 0)
-		return 0;
-	/* directories always have at least one cluster */
-	rc = exfat_truncate(ef, node, CLUSTER_SIZE(*ef->sb));
-	if (rc != 0)
-	{
-		delete(ef, node);
-		exfat_put_node(ef, node);
-		return rc;
-	}
-	exfat_put_node(ef, node);
-	return 0;
-}
-
-static void rename_entry(struct exfat* ef, struct exfat_node* dir,
-		struct exfat_node* node, const le16_t* name, cluster_t new_cluster,
-		off64_t new_offset)
-{
-	struct exfat_entry_meta1 meta1;
-	struct exfat_entry_meta2 meta2;
-	cluster_t old_cluster = node->entry_cluster;
-	off64_t old_offset = node->entry_offset;
-	const size_t name_length = utf16_length(name);
-	const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
-	int i;
-
-	exfat_pread(ef->dev, &meta1, sizeof(meta1),
-			co2o(ef, old_cluster, old_offset));
-	next_entry(ef, node->parent, &old_cluster, &old_offset);
-	exfat_pread(ef->dev, &meta2, sizeof(meta2),
-			co2o(ef, old_cluster, old_offset));
-	meta1.continuations = 1 + name_entries;
-	meta2.name_hash = exfat_calc_name_hash(ef, name);
-	meta2.name_length = name_length;
-	meta1.checksum = exfat_calc_checksum(&meta1, &meta2, name);
-
-	erase_entry(ef, node);
-
-	node->entry_cluster = new_cluster;
-	node->entry_offset = new_offset;
-
-	exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
-			co2o(ef, new_cluster, new_offset));
-	next_entry(ef, dir, &new_cluster, &new_offset);
-	exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
-			co2o(ef, new_cluster, new_offset));
-
-	for (i = 0; i < name_entries; i++)
-	{
-		struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
-		memcpy(name_entry.name, name + i * EXFAT_ENAME_MAX,
-				EXFAT_ENAME_MAX * sizeof(le16_t));
-		next_entry(ef, dir, &new_cluster, &new_offset);
-		exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
-				co2o(ef, new_cluster, new_offset));
-	}
-
-	memcpy(node->name, name, (EXFAT_NAME_MAX + 1) * sizeof(le16_t));
-	tree_detach(node);
-	tree_attach(dir, node);
-}
-
-int exfat_rename(struct exfat* ef, const char* old_path, const char* new_path)
-{
-	struct exfat_node* node;
-	struct exfat_node* existing;
-	struct exfat_node* dir;
-	cluster_t cluster = EXFAT_CLUSTER_BAD;
-	off64_t offset = -1;
-	le16_t name[EXFAT_NAME_MAX + 1];
-	int rc;
-
-	rc = exfat_lookup(ef, &node, old_path);
-	if (rc != 0)
-		return rc;
-
-	rc = exfat_split(ef, &dir, &existing, name, new_path);
-	if (rc != 0)
-	{
-		exfat_put_node(ef, node);
-		return rc;
-	}
-	if (existing != NULL)
-	{
-		/* remove target if it's not the same node as source */
-		if (existing != node)
-		{
-			if (existing->flags & EXFAT_ATTRIB_DIR)
-			{
-				if (node->flags & EXFAT_ATTRIB_DIR)
-					rc = exfat_rmdir(ef, existing);
-				else
-					rc = -ENOTDIR;
-			}
-			else
-			{
-				if (!(node->flags & EXFAT_ATTRIB_DIR))
-					rc = exfat_unlink(ef, existing);
-				else
-					rc = -EISDIR;
-			}
-			exfat_put_node(ef, existing);
-			if (rc != 0)
-			{
-				exfat_put_node(ef, dir);
-				exfat_put_node(ef, node);
-				return rc;
-			}
-		}
-		else
-			exfat_put_node(ef, existing);
-	}
-
-	rc = find_slot(ef, dir, &cluster, &offset,
-			2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
-	if (rc != 0)
-	{
-		exfat_put_node(ef, dir);
-		exfat_put_node(ef, node);
-		return rc;
-	}
-	rename_entry(ef, dir, node, name, cluster, offset);
-	exfat_put_node(ef, dir);
-	exfat_put_node(ef, node);
-	return 0;
-}
-
-void exfat_utimes(struct exfat_node* node, const struct timespec tv[2])
-{
-	node->atime = tv[0].tv_sec;
-	node->mtime = tv[1].tv_sec;
-	node->flags |= EXFAT_ATTRIB_DIRTY;
-}
-
-void exfat_update_atime(struct exfat_node* node)
-{
-	node->atime = time(NULL);
-	node->flags |= EXFAT_ATTRIB_DIRTY;
-}
-
-void exfat_update_mtime(struct exfat_node* node)
-{
-	node->mtime = time(NULL);
-	node->flags |= EXFAT_ATTRIB_DIRTY;
-}
-
-const char* exfat_get_label(struct exfat* ef)
-{
-	return ef->label;
-}
-
-static int find_label(struct exfat* ef, cluster_t* cluster, off64_t* offset)
-{
-	struct iterator it;
-	int rc;
-
-	rc = opendir(ef, ef->root, &it);
-	if (rc != 0)
-		return rc;
-
-	for (;;)
-	{
-		if (it.offset >= ef->root->size)
-		{
-			closedir(&it);
-			return -ENOENT;
-		}
-
-		if (get_entry_ptr(ef, &it)->type == EXFAT_ENTRY_LABEL)
-		{
-			*cluster = it.cluster;
-			*offset = it.offset;
-			closedir(&it);
-			return 0;
-		}
-
-		if (fetch_next_entry(ef, ef->root, &it) != 0)
-		{
-			closedir(&it);
-			return -EIO;
-		}
-	}
-}
-
-int exfat_set_label(struct exfat* ef, const char* label)
-{
-	le16_t label_utf16[EXFAT_ENAME_MAX + 1];
-	int rc;
-	cluster_t cluster;
-	off64_t offset;
-	struct exfat_entry_label entry;
-
-	memset(label_utf16, 0, sizeof(label_utf16));
-	rc = utf8_to_utf16(label_utf16, label, EXFAT_ENAME_MAX, strlen(label));
-	if (rc != 0)
-		return rc;
-
-	rc = find_label(ef, &cluster, &offset);
-	if (rc == -ENOENT)
-		rc = find_slot(ef, ef->root, &cluster, &offset, 1);
-	if (rc != 0)
-		return rc;
-
-	entry.type = EXFAT_ENTRY_LABEL;
-	entry.length = utf16_length(label_utf16);
-	memcpy(entry.name, label_utf16, sizeof(entry.name));
-	if (entry.length == 0)
-		entry.type ^= EXFAT_ENTRY_VALID;
-
-	exfat_pwrite(ef->dev, &entry, sizeof(struct exfat_entry_label),
-			co2o(ef, cluster, offset));
-	return 0;
-}