1 files changed, 0 insertions, 428 deletions
diff --git a/exfat/cluster.c b/exfat/cluster.c
deleted file mode 100644
index 6b0303df8..000000000
--- a/exfat/cluster.c
+++ /dev/null
@@ -1,428 +0,0 @@
-/*
-	cluster.c (03.09.09)
-	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>
-
-/*
- * Sector to absolute offset.
- */
-static off64_t s2o(const struct exfat* ef, off64_t sector)
-{
-	return sector << ef->sb->sector_bits;
-}
-
-/*
- * Cluster to sector.
- */
-static off64_t c2s(const struct exfat* ef, cluster_t cluster)
-{
-	if (cluster < EXFAT_FIRST_DATA_CLUSTER)
-		exfat_bug("invalid cluster number %u", cluster);
-	return le32_to_cpu(ef->sb->cluster_sector_start) +
-		((off64_t) (cluster - EXFAT_FIRST_DATA_CLUSTER) << ef->sb->spc_bits);
-}
-
-/*
- * Cluster to absolute offset.
- */
-off64_t exfat_c2o(const struct exfat* ef, cluster_t cluster)
-{
-	return s2o(ef, c2s(ef, cluster));
-}
-
-/*
- * Sector to cluster.
- */
-static cluster_t s2c(const struct exfat* ef, off64_t sector)
-{
-	return ((sector - le32_to_cpu(ef->sb->cluster_sector_start)) >>
-			ef->sb->spc_bits) + EXFAT_FIRST_DATA_CLUSTER;
-}
-
-/*
- * Size in bytes to size in clusters (rounded upwards).
- */
-static uint32_t bytes2clusters(const struct exfat* ef, uint64_t bytes)
-{
-	uint64_t cluster_size = CLUSTER_SIZE(*ef->sb);
-	return (bytes + cluster_size - 1) / cluster_size;
-}
-
-cluster_t exfat_next_cluster(const struct exfat* ef,
-		const struct exfat_node* node, cluster_t cluster)
-{
-	le32_t next;
-	off64_t fat_offset;
-
-	if (cluster < EXFAT_FIRST_DATA_CLUSTER)
-		exfat_bug("bad cluster 0x%x", cluster);
-
-	if (IS_CONTIGUOUS(*node))
-		return cluster + 1;
-	fat_offset = s2o(ef, le32_to_cpu(ef->sb->fat_sector_start))
-		+ cluster * sizeof(cluster_t);
-	exfat_pread(ef->dev, &next, sizeof(next), fat_offset);
-	return le32_to_cpu(next);
-}
-
-cluster_t exfat_advance_cluster(const struct exfat* ef,
-		struct exfat_node* node, uint32_t count)
-{
-	uint32_t i;
-
-	if (node->fptr_index > count)
-	{
-		node->fptr_index = 0;
-		node->fptr_cluster = node->start_cluster;
-	}
-
-	for (i = node->fptr_index; i < count; i++)
-	{
-		node->fptr_cluster = exfat_next_cluster(ef, node, node->fptr_cluster);
-		if (CLUSTER_INVALID(node->fptr_cluster))
-			break; /* the caller should handle this and print appropriate 
-			          error message */
-	}
-	node->fptr_index = count;
-	return node->fptr_cluster;
-}
-
-static cluster_t find_bit_and_set(uint8_t* bitmap, size_t start, size_t end)
-{
-	const size_t start_index = start / 8;
-	const size_t end_index = DIV_ROUND_UP(end, 8);
-	size_t i;
-	size_t c;
-
-	for (i = start_index; i < end_index; i++)
-	{
-		if (bitmap[i] == 0xff)
-			continue;
-		for (c = MAX(i * 8, start); c < MIN((i + 1) * 8, end); c++)
-			if (BMAP_GET(bitmap, c) == 0)
-			{
-				BMAP_SET(bitmap, c);
-				return c + EXFAT_FIRST_DATA_CLUSTER;
-			}
-	}
-	return EXFAT_CLUSTER_END;
-}
-
-void exfat_flush_cmap(struct exfat* ef)
-{
-	exfat_pwrite(ef->dev, ef->cmap.chunk, (ef->cmap.chunk_size + 7) / 8,
-			exfat_c2o(ef, ef->cmap.start_cluster));
-	ef->cmap.dirty = false;
-}
-
-static void set_next_cluster(const struct exfat* ef, int contiguous,
-		cluster_t current, cluster_t next)
-{
-	off64_t fat_offset;
-	le32_t next_le32;
-
-	if (contiguous)
-		return;
-	fat_offset = s2o(ef, le32_to_cpu(ef->sb->fat_sector_start))
-		+ current * sizeof(cluster_t);
-	next_le32 = cpu_to_le32(next);
-	exfat_pwrite(ef->dev, &next_le32, sizeof(next_le32), fat_offset);
-}
-
-static cluster_t allocate_cluster(struct exfat* ef, cluster_t hint)
-{
-	cluster_t cluster;
-
-	hint -= EXFAT_FIRST_DATA_CLUSTER;
-	if (hint >= ef->cmap.chunk_size)
-		hint = 0;
-
-	cluster = find_bit_and_set(ef->cmap.chunk, hint, ef->cmap.chunk_size);
-	if (cluster == EXFAT_CLUSTER_END)
-		cluster = find_bit_and_set(ef->cmap.chunk, 0, hint);
-	if (cluster == EXFAT_CLUSTER_END)
-	{
-		exfat_error("no free space left");
-		return EXFAT_CLUSTER_END;
-	}
-
-	ef->cmap.dirty = true;
-	return cluster;
-}
-
-static void free_cluster(struct exfat* ef, cluster_t cluster)
-{
-	if (CLUSTER_INVALID(cluster))
-		exfat_bug("freeing invalid cluster 0x%x", cluster);
-	if (cluster - EXFAT_FIRST_DATA_CLUSTER >= ef->cmap.size)
-		exfat_bug("freeing non-existing cluster 0x%x (0x%x)", cluster,
-				ef->cmap.size);
-
-	BMAP_CLR(ef->cmap.chunk, cluster - EXFAT_FIRST_DATA_CLUSTER);
-	ef->cmap.dirty = true;
-}
-
-static void make_noncontiguous(const struct exfat* ef, cluster_t first,
-		cluster_t last)
-{
-	cluster_t c;
-
-	for (c = first; c < last; c++)
-		set_next_cluster(ef, 0, c, c + 1);
-}
-
-static int shrink_file(struct exfat* ef, struct exfat_node* node,
-		uint32_t current, uint32_t difference);
-
-static int grow_file(struct exfat* ef, struct exfat_node* node,
-		uint32_t current, uint32_t difference)
-{
-	cluster_t previous;
-	cluster_t next;
-	uint32_t allocated = 0;
-
-	if (difference == 0)
-		exfat_bug("zero clusters count passed");
-
-	if (node->start_cluster != EXFAT_CLUSTER_FREE)
-	{
-		/* get the last cluster of the file */
-		previous = exfat_advance_cluster(ef, node, current - 1);
-		if (CLUSTER_INVALID(previous))
-		{
-			exfat_error("invalid cluster 0x%x while growing", previous);
-			return -EIO;
-		}
-	}
-	else
-	{
-		if (node->fptr_index != 0)
-			exfat_bug("non-zero pointer index (%u)", node->fptr_index);
-		/* file does not have clusters (i.e. is empty), allocate
-		   the first one for it */
-		previous = allocate_cluster(ef, 0);
-		if (CLUSTER_INVALID(previous))
-			return -ENOSPC;
-		node->fptr_cluster = node->start_cluster = previous;
-		allocated = 1;
-		/* file consists of only one cluster, so it's contiguous */
-		node->flags |= EXFAT_ATTRIB_CONTIGUOUS;
-	}
-
-	while (allocated < difference)
-	{
-		next = allocate_cluster(ef, previous + 1);
-		if (CLUSTER_INVALID(next))
-		{
-			if (allocated != 0)
-				shrink_file(ef, node, current + allocated, allocated);
-			return -ENOSPC;
-		}
-		if (next != previous - 1 && IS_CONTIGUOUS(*node))
-		{
-			/* it's a pity, but we are not able to keep the file contiguous
-			   anymore */
-			make_noncontiguous(ef, node->start_cluster, previous);
-			node->flags &= ~EXFAT_ATTRIB_CONTIGUOUS;
-			node->flags |= EXFAT_ATTRIB_DIRTY;
-		}
-		set_next_cluster(ef, IS_CONTIGUOUS(*node), previous, next);
-		previous = next;
-		allocated++;
-	}
-
-	set_next_cluster(ef, IS_CONTIGUOUS(*node), previous, EXFAT_CLUSTER_END);
-	return 0;
-}
-
-static int shrink_file(struct exfat* ef, struct exfat_node* node,
-		uint32_t current, uint32_t difference)
-{
-	cluster_t previous;
-	cluster_t next;
-
-	if (difference == 0)
-		exfat_bug("zero difference passed");
-	if (node->start_cluster == EXFAT_CLUSTER_FREE)
-		exfat_bug("unable to shrink empty file (%u clusters)", current);
-	if (current < difference)
-		exfat_bug("file underflow (%u < %u)", current, difference);
-
-	/* crop the file */
-	if (current > difference)
-	{
-		cluster_t last = exfat_advance_cluster(ef, node,
-				current - difference - 1);
-		if (CLUSTER_INVALID(last))
-		{
-			exfat_error("invalid cluster 0x%x while shrinking", last);
-			return -EIO;
-		}
-		previous = exfat_next_cluster(ef, node, last);
-		set_next_cluster(ef, IS_CONTIGUOUS(*node), last, EXFAT_CLUSTER_END);
-	}
-	else
-	{
-		previous = node->start_cluster;
-		node->start_cluster = EXFAT_CLUSTER_FREE;
-	}
-	node->fptr_index = 0;
-	node->fptr_cluster = node->start_cluster;
-
-	/* free remaining clusters */
-	while (difference--)
-	{
-		if (CLUSTER_INVALID(previous))
-		{
-			exfat_error("invalid cluster 0x%x while freeing after shrink",
-					previous);
-			return -EIO;
-		}
-		next = exfat_next_cluster(ef, node, previous);
-		set_next_cluster(ef, IS_CONTIGUOUS(*node), previous,
-				EXFAT_CLUSTER_FREE);
-		free_cluster(ef, previous);
-		previous = next;
-	}
-	return 0;
-}
-
-static void erase_raw(struct exfat* ef, size_t size, off64_t offset)
-{
-	exfat_pwrite(ef->dev, ef->zero_cluster, size, offset);
-}
-
-static int erase_range(struct exfat* ef, struct exfat_node* node,
-		uint64_t begin, uint64_t end)
-{
-	uint64_t cluster_boundary;
-	cluster_t cluster;
-
-	if (begin >= end)
-		return 0;
-
-	cluster_boundary = (begin | (CLUSTER_SIZE(*ef->sb) - 1)) + 1;
-	cluster = exfat_advance_cluster(ef, node,
-			begin / CLUSTER_SIZE(*ef->sb));
-	if (CLUSTER_INVALID(cluster))
-	{
-		exfat_error("invalid cluster 0x%x while erasing", cluster);
-		return -EIO;
-	}
-	/* erase from the beginning to the closest cluster boundary */
-	erase_raw(ef, MIN(cluster_boundary, end) - begin,
-			exfat_c2o(ef, cluster) + begin % CLUSTER_SIZE(*ef->sb));
-	/* erase whole clusters */
-	while (cluster_boundary < end)
-	{
-		cluster = exfat_next_cluster(ef, node, cluster);
-		/* the cluster cannot be invalid because we have just allocated it */
-		if (CLUSTER_INVALID(cluster))
-			exfat_bug("invalid cluster 0x%x after allocation", cluster);
-		erase_raw(ef, CLUSTER_SIZE(*ef->sb), exfat_c2o(ef, cluster));
-		cluster_boundary += CLUSTER_SIZE(*ef->sb);
-	}
-	return 0;
-}
-
-int exfat_truncate(struct exfat* ef, struct exfat_node* node, uint64_t size)
-{
-	uint32_t c1 = bytes2clusters(ef, node->size);
-	uint32_t c2 = bytes2clusters(ef, size);
-	int rc = 0;
-
-	if (node->references == 0 && node->parent)
-		exfat_bug("no references, node changes can be lost");
-
-	if (node->size == size)
-		return 0;
-
-	if (c1 < c2)
-		rc = grow_file(ef, node, c1, c2 - c1);
-	else if (c1 > c2)
-		rc = shrink_file(ef, node, c1, c1 - c2);
-
-	if (rc != 0)
-		return rc;
-
-	rc = erase_range(ef, node, node->size, size);
-	if (rc != 0)
-		return rc;
-
-	exfat_update_mtime(node);
-	node->size = size;
-	node->flags |= EXFAT_ATTRIB_DIRTY;
-	return 0;
-}
-
-uint32_t exfat_count_free_clusters(const struct exfat* ef)
-{
-	uint32_t free_clusters = 0;
-	uint32_t i;
-
-	for (i = 0; i < ef->cmap.size; i++)
-		if (BMAP_GET(ef->cmap.chunk, i) == 0)
-			free_clusters++;
-	return free_clusters;
-}
-
-static int find_used_clusters(const struct exfat* ef,
-		cluster_t* a, cluster_t* b)
-{
-	const cluster_t end = le32_to_cpu(ef->sb->cluster_count);
-
-	/* find first used cluster */
-	for (*a = *b + 1; *a < end; (*a)++)
-		if (BMAP_GET(ef->cmap.chunk, *a - EXFAT_FIRST_DATA_CLUSTER))
-			break;
-	if (*a >= end)
-		return 1;
-
-	/* find last contiguous used cluster */
-	for (*b = *a; *b < end; (*b)++)
-		if (BMAP_GET(ef->cmap.chunk, *b - EXFAT_FIRST_DATA_CLUSTER) == 0)
-		{
-			(*b)--;
-			break;
-		}
-
-	return 0;
-}
-
-int exfat_find_used_sectors(const struct exfat* ef, off64_t* a, off64_t* b)
-{
-	cluster_t ca, cb;
-
-	if (*a == 0 && *b == 0)
-		ca = cb = EXFAT_FIRST_DATA_CLUSTER - 1;
-	else
-	{
-		ca = s2c(ef, *a);
-		cb = s2c(ef, *b);
-	}
-	if (find_used_clusters(ef, &ca, &cb) != 0)
-		return 1;
-	if (*a != 0 || *b != 0)
-		*a = c2s(ef, ca);
-	*b = c2s(ef, cb) + (CLUSTER_SIZE(*ef->sb) - 1) / SECTOR_SIZE(*ef->sb);
-	return 0;
-}