exFAT file system implementation library.
Free exFAT implementation.
- Copyright (C) 2010-2016 Andrew Nayenko
+ Copyright (C) 2010-2017 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
*/
#include "exfat.h"
+#include "utf.h"
#include <errno.h>
#include <string.h>
#include <inttypes.h>
- /* on-disk nodes iterator */
- struct iterator
- {
- cluster_t cluster;
- off_t offset;
- int contiguous;
- char* chunk;
- };
+ #define EXFAT_ENTRY_NONE (-1)
struct exfat_node* exfat_get_node(struct exfat_node* node)
{
void exfat_put_node(struct exfat* ef, struct exfat_node* node)
{
- char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+ char buffer[EXFAT_UTF8_NAME_BUFFER_MAX];
--node->references;
if (node->references < 0)
{
- exfat_get_name(node, buffer, sizeof(buffer) - 1);
+ exfat_get_name(node, buffer);
exfat_bug("reference counter of '%s' is below zero", buffer);
}
else if (node->references == 0 && node != ef->root)
{
- if (node->flags & EXFAT_ATTRIB_DIRTY)
+ if (node->is_dirty)
{
- exfat_get_name(node, buffer, sizeof(buffer) - 1);
+ exfat_get_name(node, buffer);
exfat_warn("dirty node '%s' with zero references", buffer);
}
}
exfat_bug("unable to cleanup a node with %d references",
node->references);
- if (node->flags & EXFAT_ATTRIB_UNLINKED)
+ if (node->is_unlinked)
{
/* free all clusters and node structure itself */
rc = exfat_truncate(ef, node, 0, true);
return rc;
}
- /**
- * Cluster + offset from the beginning of the directory to absolute offset.
- */
- static off_t co2o(struct exfat* ef, cluster_t cluster, off_t offset)
+ static int read_entries(struct exfat* ef, struct exfat_node* dir,
+ struct exfat_entry* entries, int n, off_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;
- }
- if (exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster)) < 0)
- {
- exfat_error("failed to read directory cluster %#x", it->cluster);
+ ssize_t size;
+
+ if (!(dir->attrib & EXFAT_ATTRIB_DIR))
+ exfat_bug("attempted to read entries from a file");
+
+ size = exfat_generic_pread(ef, dir, entries,
+ sizeof(struct exfat_entry[n]), offset);
+ if (size == sizeof(struct exfat_entry[n]))
+ return 0; /* success */
+ if (size == 0)
+ return -ENOENT;
+ if (size < 0)
return -EIO;
- }
- return 0;
+ exfat_error("read %zd bytes instead of %zu bytes", size,
+ sizeof(struct exfat_entry[n]));
+ return -EIO;
}
- static void closedir(struct iterator* it)
+ static int write_entries(struct exfat* ef, struct exfat_node* dir,
+ const struct exfat_entry* entries, int n, off_t offset)
{
- it->cluster = 0;
- it->offset = 0;
- it->contiguous = 0;
- free(it->chunk);
- it->chunk = NULL;
- }
+ ssize_t size;
- static bool 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 true;
- 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 false;
- }
- if (exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster)) < 0)
- {
- exfat_error("failed to read the next directory cluster %#x",
- it->cluster);
- return false;
- }
- }
- return true;
+ if (!(dir->attrib & EXFAT_ATTRIB_DIR))
+ exfat_bug("attempted to write entries into a file");
+
+ size = exfat_generic_pwrite(ef, dir, entries,
+ sizeof(struct exfat_entry[n]), offset);
+ if (size == sizeof(struct exfat_entry[n]))
+ return 0; /* success */
+ if (size < 0)
+ return -EIO;
+ exfat_error("wrote %zd bytes instead of %zu bytes", size,
+ sizeof(struct exfat_entry[n]));
+ return -EIO;
}
static struct exfat_node* allocate_node(void)
static void init_node_meta1(struct exfat_node* node,
const struct exfat_entry_meta1* meta1)
{
- node->flags = le16_to_cpu(meta1->attrib);
+ node->attrib = le16_to_cpu(meta1->attrib);
+ node->continuations = meta1->continuations;
node->mtime = exfat_exfat2unix(meta1->mdate, meta1->mtime,
meta1->mtime_cs);
/* there is no centiseconds field for atime */
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;
+ node->is_contiguous = ((meta2->flags & EXFAT_FLAG_CONTIGUOUS) != 0);
}
- static const struct exfat_entry* get_entry_ptr(const struct exfat* ef,
- const struct iterator* it)
+ static void init_node_name(struct exfat_node* node,
+ const struct exfat_entry* entries, int n)
{
- return (const struct exfat_entry*)
- (it->chunk + it->offset % CLUSTER_SIZE(*ef->sb));
+ int i;
+
+ for (i = 0; i < n; i++)
+ memcpy(node->name + i * EXFAT_ENAME_MAX,
+ ((const struct exfat_entry_name*) &entries[i])->name,
+ EXFAT_ENAME_MAX * sizeof(le16_t));
}
- static bool check_node(const struct exfat_node* node, uint16_t actual_checksum,
- uint16_t reference_checksum, uint64_t valid_size)
+ static bool check_entries(const struct exfat_entry* entry, int n)
{
- char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+ int previous = EXFAT_ENTRY_NONE;
+ int current;
+ int i;
+
+ /* check transitions between entries types */
+ for (i = 0; i < n + 1; previous = current, i++)
+ {
+ bool valid = false;
+
+ current = (i < n) ? entry[i].type : EXFAT_ENTRY_NONE;
+ switch (previous)
+ {
+ case EXFAT_ENTRY_NONE:
+ valid = (current == EXFAT_ENTRY_FILE);
+ break;
+ case EXFAT_ENTRY_FILE:
+ valid = (current == EXFAT_ENTRY_FILE_INFO);
+ break;
+ case EXFAT_ENTRY_FILE_INFO:
+ valid = (current == EXFAT_ENTRY_FILE_NAME);
+ break;
+ case EXFAT_ENTRY_FILE_NAME:
+ valid = (current == EXFAT_ENTRY_FILE_NAME ||
+ current == EXFAT_ENTRY_NONE ||
+ current >= EXFAT_ENTRY_FILE_TAIL);
+ break;
+ case EXFAT_ENTRY_FILE_TAIL ... 0xff:
+ valid = (current >= EXFAT_ENTRY_FILE_TAIL ||
+ current == EXFAT_ENTRY_NONE);
+ break;
+ }
+
+ if (!valid)
+ {
+ exfat_error("unexpected entry type %#x after %#x at %d/%d",
+ current, previous, i, n);
+ return false;
+ }
+ }
+ return true;
+ }
+
+ static bool check_node(const struct exfat_node* node, le16_t actual_checksum,
+ int cluster_size, const struct exfat_entry_meta1* meta1,
+ const struct exfat_entry_meta2* meta2)
+ {
+ char buffer[EXFAT_UTF8_NAME_BUFFER_MAX];
+ bool ret = true;
/*
Validate checksum first. If it's invalid all other fields probably
contain just garbage.
*/
- if (actual_checksum != reference_checksum)
+ if (le16_to_cpu(actual_checksum) != le16_to_cpu(meta1->checksum))
{
- exfat_get_name(node, buffer, sizeof(buffer) - 1);
+ exfat_get_name(node, buffer);
exfat_error("'%s' has invalid checksum (%#hx != %#hx)", buffer,
- actual_checksum, reference_checksum);
- return false;
+ le16_to_cpu(actual_checksum), le16_to_cpu(meta1->checksum));
+ ret = false;
}
/*
cannot be greater than file size. See SetFileValidData() function
description in MSDN.
*/
- if (valid_size > node->size)
+ if (le64_to_cpu(meta2->valid_size) > node->size)
{
- exfat_get_name(node, buffer, sizeof(buffer) - 1);
+ exfat_get_name(node, buffer);
exfat_error("'%s' has valid size (%"PRIu64") greater than size "
- "(%"PRIu64")", buffer, valid_size, node->size);
- return false;
+ "(%"PRIu64")", buffer, le64_to_cpu(meta2->valid_size),
+ node->size);
+ ret = false;
}
- return true;
+ /*
+ Empty file must have zero start cluster. Non-empty file must start
+ with a valid cluster. Directories cannot be empty (i.e. must always
+ have a valid start cluster), but we will check this later while
+ reading that directory to give user a chance to read this directory.
+ */
+ if (node->size == 0 && node->start_cluster != EXFAT_CLUSTER_FREE)
+ {
+ exfat_get_name(node, buffer);
+ exfat_error("'%s' is empty but start cluster is %#x", buffer,
+ node->start_cluster);
+ ret = false;
+ }
+ if (node->size > 0 && CLUSTER_INVALID(node->start_cluster))
+ {
+ exfat_get_name(node, buffer);
+ exfat_error("'%s' points to invalid cluster %#x", buffer,
+ node->start_cluster);
+ ret = false;
+ }
+
+ /* Empty file or directory must be marked as non-contiguous. */
+ if (node->size == 0 && node->is_contiguous)
+ {
+ exfat_get_name(node, buffer);
+ exfat_error("'%s' is empty but marked as contiguous (%#hx)", buffer,
+ node->attrib);
+ ret = false;
+ }
+
+ /* Directory size must be aligned on at cluster boundary. */
+ if ((node->attrib & EXFAT_ATTRIB_DIR) && node->size % cluster_size != 0)
+ {
+ exfat_get_name(node, buffer);
+ exfat_error("'%s' directory size %"PRIu64" is not divisible by %d", buffer,
+ node->size, cluster_size);
+ ret = false;
+ }
+
+ return ret;
+ }
+
+ static int parse_file_entries(struct exfat* ef, struct exfat_node* parent,
+ struct exfat_node* node, const struct exfat_entry* entries, int n)
+ {
+ const struct exfat_entry_meta1* meta1;
+ const struct exfat_entry_meta2* meta2;
+ int mandatory_entries;
+
+ if (!check_entries(entries, n))
+ return -EIO;
+
+ meta1 = (const struct exfat_entry_meta1*) &entries[0];
+ if (meta1->continuations < 2)
+ {
+ exfat_error("too few continuations (%hhu)", meta1->continuations);
+ return -EIO;
+ }
+ meta2 = (const struct exfat_entry_meta2*) &entries[1];
+ if (meta2->flags & ~(EXFAT_FLAG_ALWAYS1 | EXFAT_FLAG_CONTIGUOUS))
+ {
+ exfat_error("unknown flags in meta2 (%#hhx)", meta2->flags);
+ return -EIO;
+ }
+ mandatory_entries = 2 + DIV_ROUND_UP(meta2->name_length, EXFAT_ENAME_MAX);
+ if (meta1->continuations < mandatory_entries - 1)
+ {
+ exfat_error("too few continuations (%hhu < %d)",
+ meta1->continuations, mandatory_entries - 1);
+ return -EIO;
+ }
+
+ init_node_meta1(node, meta1);
+ init_node_meta2(node, meta2);
+ init_node_name(node, entries + 2, mandatory_entries - 2);
+
+ if (!check_node(node, exfat_calc_checksum(entries, n),
+ CLUSTER_SIZE(*ef->sb), meta1, meta2))
+ return -EIO;
+
+ return 0;
+ }
+
+ static int parse_file_entry(struct exfat* ef, struct exfat_node* parent,
+ struct exfat_node** node, off_t* offset, int n)
+ {
+ struct exfat_entry entries[n];
+ int rc;
+
+ rc = read_entries(ef, parent, entries, n, *offset);
+ if (rc != 0)
+ return rc;
+
+ /* a new node has zero references */
+ *node = allocate_node();
+ if (*node == NULL)
+ return -ENOMEM;
+ (*node)->entry_offset = *offset;
+
+ rc = parse_file_entries(ef, parent, *node, entries, n);
+ if (rc != 0)
+ {
+ free(*node);
+ return rc;
+ }
+
+ *offset += sizeof(struct exfat_entry[n]);
+ return 0;
}
static void decompress_upcase(uint16_t* output, const le16_t* source,
}
/*
- * Reads one entry in directory at position pointed by iterator and fills
- * node structure.
+ * Read one entry in a directory at offset position and build a new node
+ * structure.
*/
- static int readdir(struct exfat* ef, const struct exfat_node* parent,
- struct exfat_node** node, struct iterator* it)
+ static int readdir(struct exfat* ef, struct exfat_node* parent,
+ struct exfat_node** node, off_t* offset)
{
- int rc = -EIO;
- const struct exfat_entry* entry;
+ int rc;
+ 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 valid_size = 0;
uint64_t upcase_size = 0;
le16_t* upcase_comp = NULL;
- *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 */
- }
+ rc = read_entries(ef, parent, &entry, 1, *offset);
+ if (rc != 0)
+ return rc;
- entry = get_entry_ptr(ef, it);
- switch (entry->type)
+ 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;
- }
- if (continuations > 1 +
- DIV_ROUND_UP(EXFAT_NAME_MAX, EXFAT_ENAME_MAX))
- {
- exfat_error("too many 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);
- valid_size = le64_to_cpu(meta2->valid_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,
- MIN(EXFAT_ENAME_MAX,
- ((*node)->name + EXFAT_NAME_MAX - namep)) *
- sizeof(le16_t));
- namep += EXFAT_ENAME_MAX;
- if (--continuations == 0)
- {
- if (!check_node(*node, actual_checksum, reference_checksum,
- valid_size))
- goto error;
- if (!fetch_next_entry(ef, parent, it))
- goto error;
- return 0; /* entry completed */
- }
- break;
+ meta1 = (const struct exfat_entry_meta1*) &entry;
+ return parse_file_entry(ef, parent, node, offset,
+ 1 + meta1->continuations);
case EXFAT_ENTRY_UPCASE:
if (ef->upcase != NULL)
break;
- upcase = (const struct exfat_entry_upcase*) entry;
+ 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;
+ return -EIO;
}
upcase_size = le64_to_cpu(upcase->size);
if (upcase_size == 0 ||
{
exfat_error("bad upcase table size (%"PRIu64" bytes)",
upcase_size);
- goto error;
+ return -EIO;
}
upcase_comp = malloc(upcase_size);
if (upcase_comp == NULL)
{
exfat_error("failed to allocate upcase table (%"PRIu64" bytes)",
upcase_size);
- rc = -ENOMEM;
- goto error;
+ return -ENOMEM;
}
/* read compressed upcase table */
"(%"PRIu64" bytes starting at cluster %#x)",
upcase_size,
le32_to_cpu(upcase->start_cluster));
- goto error;
+ return -EIO;
}
/* decompress upcase table */
{
free(upcase_comp);
exfat_error("failed to allocate decompressed upcase table");
- rc = -ENOMEM;
- goto error;
+ return -ENOMEM;
}
decompress_upcase(ef->upcase, upcase_comp,
upcase_size / sizeof(uint16_t));
break;
case EXFAT_ENTRY_BITMAP:
- bitmap = (const struct exfat_entry_bitmap*) entry;
+ 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;
+ return -EIO;
}
ef->cmap.size = le32_to_cpu(ef->sb->cluster_count) -
EXFAT_FIRST_DATA_CLUSTER;
" (expected at least %u)",
le64_to_cpu(bitmap->size),
DIV_ROUND_UP(ef->cmap.size, 8));
- goto error;
+ return -EIO;
}
/* FIXME bitmap can be rather big, up to 512 MB */
ef->cmap.chunk_size = ef->cmap.size;
{
exfat_error("failed to allocate clusters bitmap chunk "
"(%"PRIu64" bytes)", le64_to_cpu(bitmap->size));
- rc = -ENOMEM;
- goto error;
+ return -ENOMEM;
}
if (exfat_pread(ef->dev, ef->cmap.chunk,
exfat_error("failed to read clusters bitmap "
"(%"PRIu64" bytes starting at cluster %#x)",
le64_to_cpu(bitmap->size), ef->cmap.start_cluster);
- goto error;
+ return -EIO;
}
break;
case EXFAT_ENTRY_LABEL:
- label = (const struct exfat_entry_label*) entry;
+ label = (const struct exfat_entry_label*) &entry;
if (label->length > EXFAT_ENAME_MAX)
{
exfat_error("too long label (%hhu chars)", label->length);
- goto error;
+ return -EIO;
}
if (utf16_to_utf8(ef->label, label->name,
- sizeof(ef->label) - 1, EXFAT_ENAME_MAX) != 0)
- goto error;
+ sizeof(ef->label), EXFAT_ENAME_MAX) != 0)
+ return -EIO;
break;
default:
- if (!(entry->type & EXFAT_ENTRY_VALID))
+ if (!(entry.type & EXFAT_ENTRY_VALID))
break; /* deleted entry, ignore it */
- if (!(entry->type & EXFAT_ENTRY_OPTIONAL))
- {
- exfat_error("unknown entry type %#hhx", entry->type);
- goto error;
- }
- /* optional entry, warn and skip */
- exfat_warn("unknown entry type %#hhx", entry->type);
- if (continuations == 0)
- {
- exfat_error("unexpected continuation");
- goto error;
- }
- --continuations;
- break;
- }
- if (!fetch_next_entry(ef, parent, it))
- goto error;
+ exfat_error("unknown entry type %#hhx", entry.type);
+ return -EIO;
+ }
+ *offset += sizeof(entry);
}
/* 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;
+ off_t offset = 0;
int rc;
struct exfat_node* node;
struct exfat_node* current = NULL;
- if (dir->flags & EXFAT_ATTRIB_CACHED)
+ if (dir->is_cached)
return 0; /* already cached */
- rc = opendir(ef, dir, &it);
- if (rc != 0)
- return rc;
- while ((rc = readdir(ef, dir, &node, &it)) == 0)
+ while ((rc = readdir(ef, dir, &node, &offset)) == 0)
{
node->parent = dir;
if (current != NULL)
current = node;
}
- closedir(&it);
if (rc != -ENOENT)
{
return rc;
}
- dir->flags |= EXFAT_ATTRIB_CACHED;
+ dir->is_cached = true;
return 0;
}
static void reset_cache(struct exfat* ef, struct exfat_node* node)
{
- char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+ char buffer[EXFAT_UTF8_NAME_BUFFER_MAX];
while (node->child)
{
tree_detach(p);
free(p);
}
- node->flags &= ~EXFAT_ATTRIB_CACHED;
+ node->is_cached = false;
if (node->references != 0)
{
- exfat_get_name(node, buffer, sizeof(buffer) - 1);
+ exfat_get_name(node, buffer);
exfat_warn("non-zero reference counter (%d) for '%s'",
node->references, buffer);
}
- if (node != ef->root && (node->flags & EXFAT_ATTRIB_DIRTY))
+ if (node != ef->root && node->is_dirty)
{
- exfat_get_name(node, buffer, sizeof(buffer) - 1);
+ exfat_get_name(node, buffer);
exfat_bug("node '%s' is dirty", buffer);
}
while (node->references)
reset_cache(ef, ef->root);
}
- static bool next_entry(struct exfat* ef, const struct exfat_node* parent,
- cluster_t* cluster, off_t* offset)
- {
- *offset += sizeof(struct exfat_entry);
- if (*offset % CLUSTER_SIZE(*ef->sb) == 0)
- {
- *cluster = exfat_next_cluster(ef, parent, *cluster);
- if (CLUSTER_INVALID(*cluster))
- {
- exfat_error("invalid cluster %#x while getting next entry",
- *cluster);
- return false;
- }
- }
- return true;
- }
-
int exfat_flush_node(struct exfat* ef, struct exfat_node* node)
{
- cluster_t cluster;
- off_t offset;
- off_t meta1_offset, meta2_offset;
- struct exfat_entry_meta1 meta1;
- struct exfat_entry_meta2 meta2;
+ struct exfat_entry entries[1 + node->continuations];
+ struct exfat_entry_meta1* meta1 = (struct exfat_entry_meta1*) &entries[0];
+ struct exfat_entry_meta2* meta2 = (struct exfat_entry_meta2*) &entries[1];
+ int rc;
- if (!(node->flags & EXFAT_ATTRIB_DIRTY))
+ if (!node->is_dirty)
return 0; /* no need to flush */
if (ef->ro)
if (node->parent == NULL)
return 0; /* do not flush unlinked node */
- cluster = node->entry_cluster;
- offset = node->entry_offset;
- meta1_offset = co2o(ef, cluster, offset);
- if (!next_entry(ef, node->parent, &cluster, &offset))
- return -EIO;
- meta2_offset = co2o(ef, cluster, offset);
-
- if (exfat_pread(ef->dev, &meta1, sizeof(meta1), meta1_offset) < 0)
- {
- exfat_error("failed to read meta1 entry on flush");
+ rc = read_entries(ef, node->parent, entries, 1 + node->continuations,
+ node->entry_offset);
+ if (rc != 0)
+ return rc;
+ if (!check_entries(entries, 1 + node->continuations))
return -EIO;
- }
- 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);
- if (exfat_pread(ef->dev, &meta2, sizeof(meta2), meta2_offset) < 0)
- {
- exfat_error("failed to read meta2 entry on flush");
- return -EIO;
- }
- if (meta2.type != EXFAT_ENTRY_FILE_INFO)
- exfat_bug("invalid type of meta2: 0x%hhx", meta2.type);
- meta2.size = meta2.valid_size = cpu_to_le64(node->size);
- meta2.start_cluster = cpu_to_le32(node->start_cluster);
- meta2.flags = EXFAT_FLAG_ALWAYS1;
+ meta1->attrib = cpu_to_le16(node->attrib);
+ exfat_unix2exfat(node->mtime, &meta1->mdate, &meta1->mtime,
+ &meta1->mtime_cs);
+ exfat_unix2exfat(node->atime, &meta1->adate, &meta1->atime, NULL);
+ meta2->size = meta2->valid_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;
+ if (node->size != 0 && node->is_contiguous)
+ meta2->flags |= EXFAT_FLAG_CONTIGUOUS;
/* name hash remains unchanged, no need to recalculate it */
- meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
-
- if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1), meta1_offset) < 0)
- {
- exfat_error("failed to write meta1 entry on flush");
- return -EIO;
- }
- if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2), meta2_offset) < 0)
- {
- exfat_error("failed to write meta2 entry on flush");
- return -EIO;
- }
+ meta1->checksum = exfat_calc_checksum(entries, 1 + node->continuations);
+ rc = write_entries(ef, node->parent, entries, 1 + node->continuations,
+ node->entry_offset);
+ if (rc != 0)
+ return rc;
- node->flags &= ~EXFAT_ATTRIB_DIRTY;
+ node->is_dirty = false;
return exfat_flush(ef);
}
- static bool erase_entry(struct exfat* ef, struct exfat_node* node)
+ static int erase_entries(struct exfat* ef, struct exfat_node* dir, int n,
+ off_t offset)
{
- cluster_t cluster = node->entry_cluster;
- off_t offset = node->entry_offset;
- int name_entries = DIV_ROUND_UP(utf16_length(node->name), EXFAT_ENAME_MAX);
- uint8_t entry_type;
+ struct exfat_entry entries[n];
+ int rc;
+ int i;
- entry_type = EXFAT_ENTRY_FILE & ~EXFAT_ENTRY_VALID;
- if (exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset)) < 0)
- {
- exfat_error("failed to erase meta1 entry");
- return false;
- }
+ rc = read_entries(ef, dir, entries, n, offset);
+ if (rc != 0)
+ return rc;
+ for (i = 0; i < n; i++)
+ entries[i].type &= ~EXFAT_ENTRY_VALID;
+ return write_entries(ef, dir, entries, n, offset);
+ }
- if (!next_entry(ef, node->parent, &cluster, &offset))
- return false;
- entry_type = EXFAT_ENTRY_FILE_INFO & ~EXFAT_ENTRY_VALID;
- if (exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset)) < 0)
- {
- exfat_error("failed to erase meta2 entry");
- return false;
- }
+ static int erase_node(struct exfat* ef, struct exfat_node* node)
+ {
+ int rc;
- while (name_entries--)
+ exfat_get_node(node->parent);
+ rc = erase_entries(ef, node->parent, 1 + node->continuations,
+ node->entry_offset);
+ if (rc != 0)
{
- if (!next_entry(ef, node->parent, &cluster, &offset))
- return false;
- entry_type = EXFAT_ENTRY_FILE_NAME & ~EXFAT_ENTRY_VALID;
- if (exfat_pwrite(ef->dev, &entry_type, 1,
- co2o(ef, cluster, offset)) < 0)
- {
- exfat_error("failed to erase name entry");
- return false;
- }
+ exfat_put_node(ef, node->parent);
+ return rc;
}
- return true;
+ rc = exfat_flush_node(ef, node->parent);
+ exfat_put_node(ef, node->parent);
+ return rc;
}
static int shrink_directory(struct exfat* ef, struct exfat_node* dir,
uint64_t entries = 0;
uint64_t new_size;
- if (!(dir->flags & EXFAT_ATTRIB_DIR))
+ if (!(dir->attrib & EXFAT_ATTRIB_DIR))
exfat_bug("attempted to shrink a file");
- if (!(dir->flags & EXFAT_ATTRIB_CACHED))
+ if (!dir->is_cached)
exfat_bug("attempted to shrink uncached directory");
for (last_node = node = dir->child; node; node = node->next)
int rc;
exfat_get_node(parent);
- if (!erase_entry(ef, node))
+ rc = erase_node(ef, node);
+ if (rc != 0)
{
exfat_put_node(ef, parent);
- return -EIO;
+ return rc;
}
- exfat_update_mtime(parent);
tree_detach(node);
rc = shrink_directory(ef, parent, deleted_offset);
- node->flags |= EXFAT_ATTRIB_UNLINKED;
+ node->is_unlinked = true;
if (rc != 0)
{
exfat_flush_node(ef, parent);
exfat_put_node(ef, parent);
return rc;
}
+ exfat_update_mtime(parent);
rc = exfat_flush_node(ef, parent);
exfat_put_node(ef, parent);
return rc;
int exfat_unlink(struct exfat* ef, struct exfat_node* node)
{
- if (node->flags & EXFAT_ATTRIB_DIR)
+ if (node->attrib & EXFAT_ATTRIB_DIR)
return -EISDIR;
return delete(ef, node);
}
{
int rc;
- if (!(node->flags & EXFAT_ATTRIB_DIR))
+ if (!(node->attrib & EXFAT_ATTRIB_DIR))
return -ENOTDIR;
/* check that directory is empty */
rc = exfat_cache_directory(ef, node);
return delete(ef, node);
}
- static int grow_directory(struct exfat* ef, struct exfat_node* dir,
- uint64_t asize, uint32_t difference)
+ static int check_slot(struct exfat* ef, struct exfat_node* dir, off_t offset,
+ int n)
{
- return exfat_truncate(ef, dir,
- DIV_ROUND_UP(asize + difference, CLUSTER_SIZE(*ef->sb))
- * CLUSTER_SIZE(*ef->sb), true);
+ struct exfat_entry entries[n];
+ int rc;
+ size_t i;
+
+ /* Root directory contains entries, that don't have any nodes associated
+ with them (clusters bitmap, upper case table, label). We need to be
+ careful not to overwrite them. */
+ if (dir != ef->root)
+ return 0;
+
+ rc = read_entries(ef, dir, entries, n, offset);
+ if (rc != 0)
+ return rc;
+ for (i = 0; i < n; i++)
+ if (entries[i].type & EXFAT_ENTRY_VALID)
+ return -EINVAL;
+ return 0;
}
static int find_slot(struct exfat* ef, struct exfat_node* dir,
- cluster_t* cluster, off_t* offset, int subentries)
+ off_t* offset, int n)
{
- struct iterator it;
- int rc;
- const struct exfat_entry* entry;
+ bitmap_t* dmap;
+ struct exfat_node* p;
+ size_t i;
int contiguous = 0;
- rc = opendir(ef, dir, &it);
- if (rc != 0)
- return rc;
- for (;;)
+ if (!dir->is_cached)
+ exfat_bug("directory is not cached");
+
+ /* build a bitmap of valid entries in the directory */
+ dmap = calloc(BMAP_SIZE(dir->size / sizeof(struct exfat_entry)),
+ sizeof(bitmap_t));
+ if (dmap == NULL)
+ {
+ exfat_error("failed to allocate directory bitmap (%"PRIu64")",
+ dir->size / sizeof(struct exfat_entry));
+ return -ENOMEM;
+ }
+ for (p = dir->child; p != NULL; p = p->next)
+ for (i = 0; i < 1 + p->continuations; i++)
+ BMAP_SET(dmap, p->entry_offset / sizeof(struct exfat_entry) + i);
+
+ /* find a slot in the directory entries bitmap */
+ for (i = 0; i < dir->size / sizeof(struct exfat_entry); i++)
{
- if (contiguous == 0)
+ if (BMAP_GET(dmap, i) == 0)
{
- *cluster = it.cluster;
- *offset = it.offset;
+ if (contiguous++ == 0)
+ *offset = (off_t) i * sizeof(struct exfat_entry);
+ if (contiguous == n)
+ /* suitable slot is found, check that it's not occupied */
+ switch (check_slot(ef, dir, *offset, n))
+ {
+ case 0:
+ free(dmap);
+ return 0;
+ case -EIO:
+ free(dmap);
+ return -EIO;
+ case -EINVAL:
+ /* slot is occupied, continue searching */
+ contiguous = 0;
+ break;
+ }
}
- 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))
- {
- closedir(&it);
- return -EIO;
- }
+ contiguous = 0;
}
- closedir(&it);
- return 0;
+ free(dmap);
+
+ /* no suitable slots found, extend the directory */
+ if (contiguous == 0)
+ *offset = dir->size;
+ return exfat_truncate(ef, dir,
+ ROUND_UP(dir->size + sizeof(struct exfat_entry[n - contiguous]),
+ CLUSTER_SIZE(*ef->sb)),
+ true);
}
- static int write_entry(struct exfat* ef, struct exfat_node* dir,
+ static int commit_entry(struct exfat* ef, struct exfat_node* dir,
const le16_t* name, cluster_t cluster, off_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);
+ struct exfat_entry entries[2 + name_entries];
+ struct exfat_entry_meta1* meta1 = (struct exfat_entry_meta1*) &entries[0];
+ struct exfat_entry_meta2* meta2 = (struct exfat_entry_meta2*) &entries[1];
int i;
+ int rc;
- 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(entries, 0, sizeof(struct exfat_entry[2]));
+
+ 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 */
+
+ meta2->type = EXFAT_ENTRY_FILE_INFO;
+ meta2->flags = EXFAT_FLAG_ALWAYS1;
+ meta2->name_length = name_length;
+ meta2->name_hash = exfat_calc_name_hash(ef, name, name_length);
+ meta2->start_cluster = cpu_to_le32(EXFAT_CLUSTER_FREE);
- 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);
-
- if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
- co2o(ef, cluster, offset)) < 0)
- {
- exfat_error("failed to write meta1 entry");
- return -EIO;
- }
- if (!next_entry(ef, dir, &cluster, &offset))
- return -EIO;
- if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
- co2o(ef, cluster, offset)) < 0)
- {
- exfat_error("failed to write meta2 entry");
- return -EIO;
- }
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,
- MIN(EXFAT_ENAME_MAX, EXFAT_NAME_MAX - i * EXFAT_ENAME_MAX) *
- sizeof(le16_t));
- if (!next_entry(ef, dir, &cluster, &offset))
- return -EIO;
- if (exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
- co2o(ef, cluster, offset)) < 0)
- {
- exfat_error("failed to write name entry");
- return -EIO;
- }
+ struct exfat_entry_name* name_entry;
+
+ name_entry = (struct exfat_entry_name*) &entries[2 + i];
+ name_entry->type = EXFAT_ENTRY_FILE_NAME;
+ name_entry->__unknown = 0;
+ memcpy(name_entry->name, name + i * EXFAT_ENAME_MAX,
+ EXFAT_ENAME_MAX * sizeof(le16_t));
}
- init_node_meta1(node, &meta1);
- init_node_meta2(node, &meta2);
+ meta1->checksum = exfat_calc_checksum(entries, 2 + name_entries);
+ rc = write_entries(ef, dir, entries, 2 + name_entries, offset);
+ if (rc != 0)
+ return rc;
+
+ node = allocate_node();
+ if (node == NULL)
+ return -ENOMEM;
+ node->entry_offset = offset;
+ memcpy(node->name, name, name_length * sizeof(le16_t));
+ init_node_meta1(node, meta1);
+ init_node_meta2(node, meta2);
tree_attach(dir, node);
- exfat_update_mtime(dir);
return 0;
}
return -EEXIST;
}
- rc = find_slot(ef, dir, &cluster, &offset,
+ rc = find_slot(ef, dir, &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);
+ rc = commit_entry(ef, dir, name, cluster, offset, attrib);
if (rc != 0)
{
exfat_put_node(ef, dir);
return rc;
}
+ exfat_update_mtime(dir);
rc = exfat_flush_node(ef, dir);
exfat_put_node(ef, dir);
return rc;
struct exfat_node* node, const le16_t* name, cluster_t new_cluster,
off_t new_offset)
{
- struct exfat_entry_meta1 meta1;
- struct exfat_entry_meta2 meta2;
- cluster_t old_cluster = node->entry_cluster;
- off_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);
+ struct exfat_entry entries[2 + name_entries];
+ struct exfat_entry_meta1* meta1 = (struct exfat_entry_meta1*) &entries[0];
+ struct exfat_entry_meta2* meta2 = (struct exfat_entry_meta2*) &entries[1];
+ int rc;
int i;
- if (exfat_pread(ef->dev, &meta1, sizeof(meta1),
- co2o(ef, old_cluster, old_offset)) < 0)
- {
- exfat_error("failed to read meta1 entry on rename");
- return -EIO;
- }
- if (!next_entry(ef, node->parent, &old_cluster, &old_offset))
- return -EIO;
- if (exfat_pread(ef->dev, &meta2, sizeof(meta2),
- co2o(ef, old_cluster, old_offset)) < 0)
- {
- exfat_error("failed to read meta2 entry on rename");
- return -EIO;
- }
- 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);
+ rc = read_entries(ef, node->parent, entries, 2, node->entry_offset);
+ if (rc != 0)
+ return rc;
- if (!erase_entry(ef, node))
- return -EIO;
+ meta1->continuations = 1 + name_entries;
+ meta2->name_length = name_length;
+ meta2->name_hash = exfat_calc_name_hash(ef, name, name_length);
- node->entry_cluster = new_cluster;
- node->entry_offset = new_offset;
+ rc = erase_node(ef, node);
+ if (rc != 0)
+ return rc;
- if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
- co2o(ef, new_cluster, new_offset)) < 0)
- {
- exfat_error("failed to write meta1 entry on rename");
- return -EIO;
- }
- if (!next_entry(ef, dir, &new_cluster, &new_offset))
- return -EIO;
- if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
- co2o(ef, new_cluster, new_offset)) < 0)
- {
- exfat_error("failed to write meta2 entry on rename");
- return -EIO;
- }
+ node->entry_offset = new_offset;
+ node->continuations = 1 + name_entries;
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,
+ struct exfat_entry_name* name_entry;
+
+ name_entry = (struct exfat_entry_name*) &entries[2 + i];
+ name_entry->type = EXFAT_ENTRY_FILE_NAME;
+ name_entry->__unknown = 0;
+ memcpy(name_entry->name, name + i * EXFAT_ENAME_MAX,
EXFAT_ENAME_MAX * sizeof(le16_t));
- if (!next_entry(ef, dir, &new_cluster, &new_offset))
- return -EIO;
- if (exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
- co2o(ef, new_cluster, new_offset)) < 0)
- {
- exfat_error("failed to write name entry on rename");
- return -EIO;
- }
}
+ meta1->checksum = exfat_calc_checksum(entries, 2 + name_entries);
+ rc = write_entries(ef, dir, entries, 2 + name_entries, new_offset);
+ if (rc != 0)
+ return rc;
+
memcpy(node->name, name, (EXFAT_NAME_MAX + 1) * sizeof(le16_t));
tree_detach(node);
tree_attach(dir, node);
}
/* check that target is not a subdirectory of the source */
- if (node->flags & EXFAT_ATTRIB_DIR)
+ if (node->attrib & EXFAT_ATTRIB_DIR)
{
struct exfat_node* p;
/* remove target if it's not the same node as source */
if (existing != node)
{
- if (existing->flags & EXFAT_ATTRIB_DIR)
+ if (existing->attrib & EXFAT_ATTRIB_DIR)
{
- if (node->flags & EXFAT_ATTRIB_DIR)
+ if (node->attrib & EXFAT_ATTRIB_DIR)
rc = exfat_rmdir(ef, existing);
else
rc = -ENOTDIR;
}
else
{
- if (!(node->flags & EXFAT_ATTRIB_DIR))
+ if (!(node->attrib & EXFAT_ATTRIB_DIR))
rc = exfat_unlink(ef, existing);
else
rc = -EISDIR;
exfat_put_node(ef, existing);
}
- rc = find_slot(ef, dir, &cluster, &offset,
+ rc = find_slot(ef, dir, &offset,
2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
if (rc != 0)
{
return rc;
}
rc = rename_entry(ef, dir, node, name, cluster, offset);
+ if (rc != 0)
+ {
+ exfat_put_node(ef, dir);
+ exfat_put_node(ef, node);
+ return rc;
+ }
+ rc = exfat_flush_node(ef, dir);
exfat_put_node(ef, dir);
exfat_put_node(ef, node);
+ /* node itself is not marked as dirty, no need to flush it */
return rc;
}
{
node->atime = tv[0].tv_sec;
node->mtime = tv[1].tv_sec;
- node->flags |= EXFAT_ATTRIB_DIRTY;
+ node->is_dirty = true;
}
void exfat_update_atime(struct exfat_node* node)
{
node->atime = time(NULL);
- node->flags |= EXFAT_ATTRIB_DIRTY;
+ node->is_dirty = true;
}
void exfat_update_mtime(struct exfat_node* node)
{
node->mtime = time(NULL);
- node->flags |= EXFAT_ATTRIB_DIRTY;
+ node->is_dirty = true;
}
const char* exfat_get_label(struct exfat* ef)
return ef->label;
}
- static int find_label(struct exfat* ef, cluster_t* cluster, off_t* offset)
+ static int find_label(struct exfat* ef, off_t* offset)
{
- struct iterator it;
+ struct exfat_entry entry;
int rc;
- rc = opendir(ef, ef->root, &it);
- if (rc != 0)
- return rc;
-
- for (;;)
+ for (*offset = 0; ; *offset += sizeof(entry))
{
- if (it.offset >= ef->root->size)
- {
- closedir(&it);
- return -ENOENT;
- }
+ rc = read_entries(ef, ef->root, &entry, 1, *offset);
+ if (rc != 0)
+ return rc;
- if (get_entry_ptr(ef, &it)->type == EXFAT_ENTRY_LABEL)
- {
- *cluster = it.cluster;
- *offset = it.offset;
- closedir(&it);
+ if (entry.type == EXFAT_ENTRY_LABEL)
return 0;
- }
-
- if (!fetch_next_entry(ef, ef->root, &it))
- {
- closedir(&it);
- return -EIO;
- }
}
}
{
le16_t label_utf16[EXFAT_ENAME_MAX + 1];
int rc;
- cluster_t cluster;
off_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));
+ rc = utf8_to_utf16(label_utf16, label, EXFAT_ENAME_MAX + 1, strlen(label));
if (rc != 0)
return rc;
- rc = find_label(ef, &cluster, &offset);
+ rc = find_label(ef, &offset);
if (rc == -ENOENT)
- rc = find_slot(ef, ef->root, &cluster, &offset, 1);
+ rc = find_slot(ef, ef->root, &offset, 1);
if (rc != 0)
return rc;
if (entry.length == 0)
entry.type ^= EXFAT_ENTRY_VALID;
- if (exfat_pwrite(ef->dev, &entry, sizeof(struct exfat_entry_label),
- co2o(ef, cluster, offset)) < 0)
- {
- exfat_error("failed to write label entry");
- return -EIO;
- }
+ rc = write_entries(ef, ef->root, (struct exfat_entry*) &entry, 1, offset);
+ if (rc != 0)
+ return rc;
+
strcpy(ef->label, label);
return 0;
}
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