node.c (09.10.09)
exFAT file system implementation library.
- Copyright (C) 2009, 2010 Andrew Nayenko
+ Copyright (C) 2010-2013 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
exfat_error("out of memory");
return -ENOMEM;
}
- exfat_read_raw(it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster), ef->fd);
+ exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
+ exfat_c2o(ef, it->cluster));
return 0;
}
/* 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 while reading directory");
+ exfat_error("invalid cluster 0x%x while reading directory",
+ it->cluster);
return 1;
}
- exfat_read_raw(it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster), ef->fd);
+ exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
+ exfat_c2o(ef, it->cluster));
}
return 0;
}
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;
le16_t* namep = NULL;
uint16_t reference_checksum = 0;
uint16_t actual_checksum = 0;
+ uint64_t real_size = 0;
*node = NULL;
for (;;)
{
- /* every directory (even empty one) occupies at least one cluster and
- must contain EOD entry */
- entry = get_entry_ptr(ef, it);
-
- switch (entry->type)
+ if (it->offset >= parent->size)
{
- case EXFAT_ENTRY_EOD:
if (continuations != 0)
{
- exfat_error("expected %hhu continuations before EOD",
- continuations);
+ 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)
{
if (continuations < 2)
{
exfat_error("too few continuations (%hhu)", continuations);
- return -EIO;
+ goto error;
}
reference_checksum = le16_to_cpu(meta1->checksum);
actual_checksum = exfat_start_checksum(meta1);
*node = allocate_node();
if (*node == NULL)
- return -ENOMEM;
+ {
+ rc = -ENOMEM;
+ goto error;
+ }
/* new node has zero reference counter */
(*node)->entry_cluster = it->cluster;
(*node)->entry_offset = it->offset;
}
init_node_meta2(*node, meta2);
actual_checksum = exfat_add_checksum(entry, actual_checksum);
- /* 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. */
- if (le64_to_cpu(meta2->real_size) != (*node)->size)
- {
- exfat_error("real size does not equal to size "
- "(%"PRIu64" != %"PRIu64")",
- le64_to_cpu(meta2->real_size), (*node)->size);
- goto error;
- }
+ 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))
{
if (((*node)->flags & EXFAT_ATTRIB_DIR) &&
(*node)->size % CLUSTER_SIZE(*ef->sb) != 0)
{
- char buffer[EXFAT_NAME_MAX + 1];
-
- exfat_get_name(*node, buffer, EXFAT_NAME_MAX);
- exfat_error("directory `%s' has invalid size %"PRIu64" bytes",
- buffer, (*node)->size);
+ exfat_error("directory has invalid size %"PRIu64" bytes",
+ (*node)->size);
goto error;
}
--continuations;
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)
{
- exfat_error("invalid checksum (0x%hx != 0x%hx)",
- actual_checksum, reference_checksum);
- return -EIO;
+ 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;
upcase = (const struct exfat_entry_upcase*) entry;
if (CLUSTER_INVALID(le32_to_cpu(upcase->start_cluster)))
{
- exfat_error("invalid cluster in upcase table");
- return -EIO;
+ 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) ||
{
exfat_error("bad upcase table size (%"PRIu64" bytes)",
le64_to_cpu(upcase->size));
- return -EIO;
+ 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));
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto error;
}
ef->upcase_chars = le64_to_cpu(upcase->size) / sizeof(le16_t);
- exfat_read_raw(ef->upcase, le64_to_cpu(upcase->size),
- exfat_c2o(ef, le32_to_cpu(upcase->start_cluster)), ef->fd);
+ 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;
- if (CLUSTER_INVALID(le32_to_cpu(bitmap->start_cluster)))
+ ef->cmap.start_cluster = le32_to_cpu(bitmap->start_cluster);
+ if (CLUSTER_INVALID(ef->cmap.start_cluster))
{
- exfat_error("invalid cluster in clusters bitmap");
- return -EIO;
+ 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;
exfat_error("invalid clusters bitmap size: %"PRIu64
" (expected at least %u)",
le64_to_cpu(bitmap->size), (ef->cmap.size + 7) / 8);
- return -EIO;
+ goto error;
}
- ef->cmap.start_cluster = le32_to_cpu(bitmap->start_cluster);
/* 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));
{
exfat_error("failed to allocate clusters bitmap chunk "
"(%"PRIu64" bytes)", le64_to_cpu(bitmap->size));
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto error;
}
- exfat_read_raw(ef->cmap.chunk, le64_to_cpu(bitmap->size),
- exfat_c2o(ef, ef->cmap.start_cluster), ef->fd);
+ exfat_pread(ef->dev, ef->cmap.chunk, le64_to_cpu(bitmap->size),
+ exfat_c2o(ef, ef->cmap.start_cluster));
break;
case EXFAT_ENTRY_LABEL:
if (label->length > EXFAT_ENAME_MAX)
{
exfat_error("too long label (%hhu chars)", label->length);
- return -EIO;
+ goto error;
}
if (utf16_to_utf8(ef->label, label->name,
sizeof(ef->label), EXFAT_ENAME_MAX) != 0)
- return -EIO;
+ goto error;
break;
default:
error:
free(*node);
*node = NULL;
- return -EIO;
+ return rc;
}
int exfat_cache_directory(struct exfat* ef, struct exfat_node* dir)
return 0;
}
-static void reset_cache(struct exfat* ef, struct exfat_node* node)
+static void tree_attach(struct exfat_node* dir, struct exfat_node* node)
{
- struct exfat_node* child;
- struct exfat_node* next;
+ node->parent = dir;
+ if (dir->child)
+ {
+ dir->child->prev = node;
+ node->next = dir->child;
+ }
+ dir->child = node;
+}
- for (child = node->child; child; child = next)
+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)
{
- reset_cache(ef, child);
- next = child->next;
- free(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_warn("non-zero reference counter (%d) for `%s'",
node->references, buffer);
}
- while (node->references--)
+ while (node->references)
exfat_put_node(ef, node);
- node->child = NULL;
- node->flags &= ~EXFAT_ATTRIB_CACHED;
}
void exfat_reset_cache(struct exfat* ef)
next_entry(ef, node->parent, &cluster, &offset);
meta2_offset = co2o(ef, cluster, offset);
- exfat_read_raw(&meta1, sizeof(meta1), meta1_offset, ef->fd);
+ 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_read_raw(&meta2, sizeof(meta2), meta2_offset, ef->fd);
+ 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);
meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
- exfat_write_raw(&meta1, sizeof(meta1), meta1_offset, ef->fd);
- exfat_write_raw(&meta2, sizeof(meta2), meta2_offset, ef->fd);
+ exfat_pwrite(ef->dev, &meta1, sizeof(meta1), meta1_offset);
+ exfat_pwrite(ef->dev, &meta2, sizeof(meta2), meta2_offset);
node->flags &= ~EXFAT_ATTRIB_DIRTY;
}
uint8_t entry_type;
entry_type = EXFAT_ENTRY_FILE & ~EXFAT_ENTRY_VALID;
- exfat_write_raw(&entry_type, 1, co2o(ef, cluster, offset), ef->fd);
+ 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_write_raw(&entry_type, 1, co2o(ef, cluster, offset), ef->fd);
+ 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_write_raw(&entry_type, 1, co2o(ef, cluster, offset), ef->fd);
- }
-}
-
-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 tree_attach(struct exfat_node* dir, struct exfat_node* node)
-{
- node->parent = dir;
- if (dir->child)
- {
- dir->child->prev = node;
- node->next = dir->child;
+ exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
}
- dir->child = node;
}
static int shrink_directory(struct exfat* ef, struct exfat_node* dir,
{
const struct exfat_node* node;
const struct exfat_node* last_node;
- uint64_t entries = 1; /* a directory always has at leat 1 entry (EOD) */
+ uint64_t entries = 0;
uint64_t new_size;
- struct exfat_entry eod;
- off_t eod_offset;
int rc;
if (!(dir->flags & EXFAT_ATTRIB_DIR))
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;
-
- /* put EOD entry at the end of the last cluster */
- memset(&eod, 0, sizeof(eod));
- eod_offset = new_size - sizeof(struct exfat_entry);
- if (last_node)
- exfat_write_raw(&eod, sizeof(eod),
- co2o(ef, last_node->entry_cluster, eod_offset), ef->fd);
- else
- exfat_write_raw(&eod, sizeof(eod),
- co2o(ef, dir->start_cluster, eod_offset), ef->fd);
return 0;
}
*offset = it.offset;
}
entry = get_entry_ptr(ef, &it);
- if (entry->type == EXFAT_ENTRY_EOD)
+ 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,
- it.offset + sizeof(struct exfat_entry), /* actual size */
+ rc = grow_directory(ef, dir, dir->size,
(subentries - contiguous) * sizeof(struct exfat_entry));
if (rc != 0)
{
closedir(&it);
return rc;
}
- break;
}
- if (entry->type & EXFAT_ENTRY_VALID)
- contiguous = 0;
- else
- contiguous++;
- if (contiguous == subentries)
- break; /* suitable slot is found */
if (fetch_next_entry(ef, dir, &it) != 0)
{
closedir(&it);
&meta1.crtime_cs);
meta1.adate = meta1.mdate = meta1.crdate;
meta1.atime = meta1.mtime = meta1.crtime;
- /* crtime_cs and mtime_cs contain addition to the time in centiseconds;
- just ignore those fields because we operate with 2 sec resolution */
+ meta1.mtime_cs = meta1.crtime_cs; /* there is no atime_cs */
memset(&meta2, 0, sizeof(meta2));
meta2.type = EXFAT_ENTRY_FILE_INFO;
meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
- exfat_write_raw(&meta1, sizeof(meta1), co2o(ef, cluster, offset), ef->fd);
+ exfat_pwrite(ef->dev, &meta1, sizeof(meta1), co2o(ef, cluster, offset));
next_entry(ef, dir, &cluster, &offset);
- exfat_write_raw(&meta2, sizeof(meta2), co2o(ef, cluster, offset), ef->fd);
+ 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_write_raw(&name_entry, sizeof(name_entry),
- co2o(ef, cluster, offset), ef->fd);
+ exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
+ co2o(ef, cluster, offset));
}
init_node_meta1(node, &meta1);
const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
int i;
- exfat_read_raw(&meta1, sizeof(meta1), co2o(ef, old_cluster, old_offset),
- ef->fd);
+ exfat_pread(ef->dev, &meta1, sizeof(meta1),
+ co2o(ef, old_cluster, old_offset));
next_entry(ef, node->parent, &old_cluster, &old_offset);
- exfat_read_raw(&meta2, sizeof(meta2), co2o(ef, old_cluster, old_offset),
- ef->fd);
+ 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;
node->entry_cluster = new_cluster;
node->entry_offset = new_offset;
- exfat_write_raw(&meta1, sizeof(meta1), co2o(ef, new_cluster, new_offset),
- ef->fd);
+ exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
+ co2o(ef, new_cluster, new_offset));
next_entry(ef, dir, &new_cluster, &new_offset);
- exfat_write_raw(&meta2, sizeof(meta2), co2o(ef, new_cluster, new_offset),
- ef->fd);
+ exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
+ co2o(ef, new_cluster, new_offset));
for (i = 0; i < name_entries; i++)
{
memcpy(name_entry.name, name + i * EXFAT_ENAME_MAX,
EXFAT_ENAME_MAX * sizeof(le16_t));
next_entry(ef, dir, &new_cluster, &new_offset);
- exfat_write_raw(&name_entry, sizeof(name_entry),
- co2o(ef, new_cluster, new_offset), ef->fd);
+ 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));
exfat_put_node(ef, node);
return rc;
}
+
+ /* check that target is not a subdirectory of the source */
+ if (node->flags & EXFAT_ATTRIB_DIR)
+ {
+ struct exfat_node* p;
+
+ for (p = dir; p; p = p->parent)
+ if (node == p)
+ {
+ if (existing != NULL)
+ exfat_put_node(ef, existing);
+ exfat_put_node(ef, dir);
+ exfat_put_node(ef, node);
+ return -EINVAL;
+ }
+ }
+
if (existing != NULL)
{
- if (existing->flags & EXFAT_ATTRIB_DIR)
+ /* remove target if it's not the same node as source */
+ if (existing != node)
{
- if (node->flags & EXFAT_ATTRIB_DIR)
- rc = exfat_rmdir(ef, existing);
+ if (existing->flags & EXFAT_ATTRIB_DIR)
+ {
+ if (node->flags & EXFAT_ATTRIB_DIR)
+ rc = exfat_rmdir(ef, existing);
+ else
+ rc = -ENOTDIR;
+ }
else
- rc = -ENOTDIR;
+ {
+ 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
- {
- 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;
- }
+ exfat_put_node(ef, existing);
}
rc = find_slot(ef, dir, &cluster, &offset,
{
struct iterator it;
int rc;
- const struct exfat_entry* entry;
rc = opendir(ef, ef->root, &it);
if (rc != 0)
for (;;)
{
- entry = get_entry_ptr(ef, &it);
-
- if (entry->type == EXFAT_ENTRY_EOD)
+ if (it.offset >= ef->root->size)
{
closedir(&it);
return -ENOENT;
}
- if (entry->type == EXFAT_ENTRY_LABEL)
+
+ if (get_entry_ptr(ef, &it)->type == EXFAT_ENTRY_LABEL)
{
*cluster = it.cluster;
*offset = it.offset;
if (entry.length == 0)
entry.type ^= EXFAT_ENTRY_VALID;
- exfat_write_raw(&entry, sizeof(struct exfat_entry_label),
- co2o(ef, cluster, offset), ef->fd);
+ exfat_pwrite(ef->dev, &entry, sizeof(struct exfat_entry_label),
+ co2o(ef, cluster, offset));
return 0;
}
projects / sven / exfat-utils.git / blobdiff