exFAT file system implementation library.
Free exFAT implementation.
- Copyright (C) 2010-2015 Andrew Nayenko
+ Copyright (C) 2010-2018 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
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;
+ return DIV_ROUND_UP(bytes, cluster_size);
}
cluster_t exfat_next_cluster(const struct exfat* ef,
if (cluster < EXFAT_FIRST_DATA_CLUSTER)
exfat_bug("bad cluster 0x%x", cluster);
- if (IS_CONTIGUOUS(*node))
+ if (node->is_contiguous)
return cluster + 1;
fat_offset = s2o(ef, le32_to_cpu(ef->sb->fat_sector_start))
+ cluster * sizeof(cluster_t);
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))
+ if (CLUSTER_INVALID(*ef->sb, node->fptr_cluster))
break; /* the caller should handle this and print appropriate
error message */
}
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,
+ exfat_bug("caller must check cluster validity (%#x, %#x)", cluster,
ef->cmap.size);
BMAP_CLR(ef->cmap.chunk, cluster - EXFAT_FIRST_DATA_CLUSTER);
{
/* get the last cluster of the file */
previous = exfat_advance_cluster(ef, node, current - 1);
- if (CLUSTER_INVALID(previous))
+ if (CLUSTER_INVALID(*ef->sb, previous))
{
exfat_error("invalid cluster 0x%x while growing", previous);
return -EIO;
/* file does not have clusters (i.e. is empty), allocate
the first one for it */
previous = allocate_cluster(ef, 0);
- if (CLUSTER_INVALID(previous))
+ if (CLUSTER_INVALID(*ef->sb, 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;
+ node->is_contiguous = true;
}
while (allocated < difference)
{
next = allocate_cluster(ef, previous + 1);
- if (CLUSTER_INVALID(next))
+ if (CLUSTER_INVALID(*ef->sb, next))
{
if (allocated != 0)
shrink_file(ef, node, current + allocated, allocated);
return -ENOSPC;
}
- if (next != previous - 1 && IS_CONTIGUOUS(*node))
+ if (next != previous - 1 && node->is_contiguous)
{
/* it's a pity, but we are not able to keep the file contiguous
anymore */
if (!make_noncontiguous(ef, node->start_cluster, previous))
return -EIO;
- node->flags &= ~EXFAT_ATTRIB_CONTIGUOUS;
- node->flags |= EXFAT_ATTRIB_DIRTY;
+ node->is_contiguous = false;
+ node->is_dirty = true;
}
- if (!set_next_cluster(ef, IS_CONTIGUOUS(*node), previous, next))
+ if (!set_next_cluster(ef, node->is_contiguous, previous, next))
return -EIO;
previous = next;
allocated++;
}
- if (!set_next_cluster(ef, IS_CONTIGUOUS(*node), previous,
+ if (!set_next_cluster(ef, node->is_contiguous, previous,
EXFAT_CLUSTER_END))
return -EIO;
return 0;
{
cluster_t last = exfat_advance_cluster(ef, node,
current - difference - 1);
- if (CLUSTER_INVALID(last))
+ if (CLUSTER_INVALID(*ef->sb, last))
{
exfat_error("invalid cluster 0x%x while shrinking", last);
return -EIO;
}
previous = exfat_next_cluster(ef, node, last);
- if (!set_next_cluster(ef, IS_CONTIGUOUS(*node), last,
+ if (!set_next_cluster(ef, node->is_contiguous, last,
EXFAT_CLUSTER_END))
return -EIO;
}
{
previous = node->start_cluster;
node->start_cluster = EXFAT_CLUSTER_FREE;
- node->flags |= EXFAT_ATTRIB_DIRTY;
+ node->is_dirty = true;
}
node->fptr_index = 0;
node->fptr_cluster = node->start_cluster;
/* free remaining clusters */
while (difference--)
{
- if (CLUSTER_INVALID(previous))
+ if (CLUSTER_INVALID(*ef->sb, previous))
{
exfat_error("invalid cluster 0x%x while freeing after shrink",
previous);
return -EIO;
}
+
next = exfat_next_cluster(ef, node, previous);
- if (!set_next_cluster(ef, IS_CONTIGUOUS(*node), previous,
+ if (!set_next_cluster(ef, node->is_contiguous, previous,
EXFAT_CLUSTER_FREE))
return -EIO;
free_cluster(ef, previous);
cluster_boundary = (begin | (CLUSTER_SIZE(*ef->sb) - 1)) + 1;
cluster = exfat_advance_cluster(ef, node,
begin / CLUSTER_SIZE(*ef->sb));
- if (CLUSTER_INVALID(cluster))
+ if (CLUSTER_INVALID(*ef->sb, cluster))
{
exfat_error("invalid cluster 0x%x while erasing", cluster);
return -EIO;
{
cluster = exfat_next_cluster(ef, node, cluster);
/* the cluster cannot be invalid because we have just allocated it */
- if (CLUSTER_INVALID(cluster))
+ if (CLUSTER_INVALID(*ef->sb, cluster))
exfat_bug("invalid cluster 0x%x after allocation", cluster);
if (!erase_raw(ef, CLUSTER_SIZE(*ef->sb), exfat_c2o(ef, cluster)))
return -EIO;
exfat_update_mtime(node);
node->size = size;
- node->flags |= EXFAT_ATTRIB_DIRTY;
+ node->is_dirty = true;
return 0;
}