/*
- * node.c
- * exFAT file system implementation library.
- *
- * Created by Andrew Nayenko on 09.10.09.
- * This software is distributed under the GNU General Public License
- * version 3 or any later.
- */
+ node.c (09.10.09)
+ exFAT file system implementation library.
+
+ Free exFAT implementation.
+ 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
+ the Free Software Foundation, either version 2 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, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
#include "exfat.h"
#include <errno.h>
{
if (--node->references < 0)
{
- char buffer[EXFAT_NAME_MAX + 1];
- exfat_get_name(node, buffer, EXFAT_NAME_MAX);
+ char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+ exfat_get_name(node, buffer, sizeof(buffer) - 1);
exfat_bug("reference counter of `%s' is below zero", buffer);
}
- if (node->references == 0 && node->flags & EXFAT_ATTRIB_DIRTY)
- exfat_flush_node(ef, node);
+ 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, true);
+ free(node);
+ }
+ if (ef->cmap.dirty)
+ exfat_flush_cmap(ef);
+ }
}
-static void opendir(const struct exfat_node* dir, struct iterator* it)
+/**
+ * Cluster + offset from the beginning of the directory to absolute offset.
+ */
+static off_t co2o(struct exfat* ef, cluster_t cluster, 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("`%s' is not a directory", dir->name);
+ exfat_bug("not a directory");
it->cluster = dir->start_cluster;
it->offset = 0;
it->contiguous = IS_CONTIGUOUS(*dir);
- it->chunk = NULL;
+ 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->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_file* file;
- const struct exfat_file_info* file_info;
- const struct exfat_file_name* file_name;
- const struct exfat_upcase* upcase;
- const struct exfat_bitmap* bitmap;
- const struct exfat_label* label;
+ 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;
- if (it->chunk == NULL)
- {
- it->chunk = malloc(CLUSTER_SIZE(*ef->sb));
- if (it->chunk == NULL)
- {
- exfat_error("out of memory");
- return -ENOMEM;
- }
- exfat_read_raw(it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster), ef->fd);
- }
-
for (;;)
{
- /* every directory (even empty one) occupies at least one cluster and
- must contain EOD entry */
- entry = (const struct exfat_entry*)
- (it->chunk + it->offset % CLUSTER_SIZE(*ef->sb));
- /* move iterator to the next entry in the directory */
- it->offset += sizeof(struct exfat_entry);
-
- 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)
{
continuations);
goto error;
}
- file = (const struct exfat_file*) entry;
- continuations = file->continuations;
+ 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);
- return -EIO;
+ goto error;
}
- reference_checksum = le16_to_cpu(file->checksum);
- actual_checksum = exfat_start_checksum(file);
- *node = malloc(sizeof(struct exfat_node));
+ reference_checksum = le16_to_cpu(meta1->checksum);
+ actual_checksum = exfat_start_checksum(meta1);
+ *node = allocate_node();
if (*node == NULL)
{
- exfat_error("failed to allocate node");
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto error;
}
- memset(*node, 0, sizeof(struct exfat_node));
/* new node has zero reference counter */
- (*node)->meta1_offset = exfat_c2o(ef, it->cluster) +
- (it->offset - sizeof(struct exfat_entry)) %
- CLUSTER_SIZE(*ef->sb);
- (*node)->flags = le16_to_cpu(file->attrib);
- (*node)->mtime = exfat_exfat2unix(file->mdate, file->mtime);
- (*node)->atime = exfat_exfat2unix(file->adate, file->atime);
+ (*node)->entry_cluster = it->cluster;
+ (*node)->entry_offset = it->offset;
+ init_node_meta1(*node, meta1);
namep = (*node)->name;
break;
continuations);
goto error;
}
- file_info = (const struct exfat_file_info*) entry;
+ 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);
- (*node)->meta2_offset = exfat_c2o(ef, it->cluster) +
- (it->offset - sizeof(struct exfat_entry)) %
- CLUSTER_SIZE(*ef->sb);
- (*node)->size = le64_to_cpu(file_info->size);
+ 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)
{
- 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;
}
- (*node)->start_cluster = le32_to_cpu(file_info->start_cluster);
- (*node)->fptr_cluster = (*node)->start_cluster;
- if (file_info->flag == EXFAT_FLAG_CONTIGUOUS)
- (*node)->flags |= EXFAT_ATTRIB_CONTIGUOUS;
--continuations;
break;
exfat_error("unexpected continuation");
goto error;
}
- file_name = (const struct exfat_file_name*) entry;
+ 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[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+
+ exfat_get_name(*node, buffer, sizeof(buffer) - 1);
+ 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[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+
+ exfat_get_name(*node, buffer, sizeof(buffer) - 1);
+ 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_upcase*) entry;
+ 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_bitmap*) entry;
- if (CLUSTER_INVALID(le32_to_cpu(bitmap->start_cluster)))
+ 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 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;
- if (le64_to_cpu(bitmap->size) != (ef->cmap.size + 7) / 8)
+ if (le64_to_cpu(bitmap->size) < (ef->cmap.size + 7) / 8)
{
- exfat_error("invalid bitmap size: %"PRIu64" (expected %u)",
+ 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));
if (ef->cmap.chunk == NULL)
{
- exfat_error("failed to allocate clusters map chunk "
+ 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:
- label = (const struct exfat_label*) entry;
+ label = (const struct exfat_entry_label*) entry;
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) - 1, EXFAT_ENAME_MAX) != 0)
+ goto error;
break;
default:
if (entry->type & EXFAT_ENTRY_VALID)
{
- exfat_error("unknown entry type 0x%hhu", entry->type);
+ exfat_error("unknown entry type 0x%hhx", entry->type);
goto error;
}
break;
}
- /* fetch the next cluster if needed */
- if ((it->offset & (CLUSTER_SIZE(*ef->sb) - 1)) == 0)
- {
- it->cluster = exfat_next_cluster(ef, parent, it->cluster);
- if (CLUSTER_INVALID(it->cluster))
- {
- exfat_error("invalid cluster while reading directory");
- goto error;
- }
- exfat_read_raw(it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster), ef->fd);
- }
+ if (fetch_next_entry(ef, parent, it) != 0)
+ goto error;
}
/* we never reach here */
error:
free(*node);
*node = NULL;
- return -EIO;
+ return rc;
}
int exfat_cache_directory(struct exfat* ef, struct exfat_node* dir)
if (dir->flags & EXFAT_ATTRIB_CACHED)
return 0; /* already cached */
- opendir(dir, &it);
+ 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;
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_get_name(node, buffer, EXFAT_NAME_MAX);
+ char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+ exfat_get_name(node, buffer, sizeof(buffer) - 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)
reset_cache(ef, ef->root);
}
+static void 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)
+ /* next cluster cannot be invalid */
+ *cluster = exfat_next_cluster(ef, parent, *cluster);
+}
+
void exfat_flush_node(struct exfat* ef, struct exfat_node* node)
{
- struct exfat_file meta1;
- struct exfat_file_info meta2;
- uint16_t checksum;
- uint8_t i;
+ cluster_t cluster;
+ off_t offset;
+ off_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_read_raw(&meta1, sizeof(meta1), node->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);
- exfat_unix2exfat(node->atime, &meta1.adate, &meta1.atime);
+ 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), node->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 = cpu_to_le64(node->size);
+ meta2.size = meta2.real_size = cpu_to_le64(node->size);
meta2.start_cluster = cpu_to_le32(node->start_cluster);
- meta2.flag = (IS_CONTIGUOUS(*node) ?
- EXFAT_FLAG_CONTIGUOUS : EXFAT_FLAG_FRAGMENTED);
- /* FIXME name hash */
+ 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;
+ off_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,
+ off_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, true);
+ if (rc != 0)
+ return rc;
+ return 0;
+}
+
+static int delete(struct exfat* ef, struct exfat_node* node)
+{
+ struct exfat_node* parent = node->parent;
+ off_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), true);
+}
+
+static int find_slot(struct exfat* ef, struct exfat_node* dir,
+ cluster_t* cluster, off_t* offset, int subentries)
+{
+ struct iterator it;
+ int rc;
+ const struct exfat_entry* entry;
+ int contiguous = 0;
- checksum = exfat_start_checksum(&meta1);
- checksum = exfat_add_checksum(&meta2, checksum);
- for (i = 1; i < meta1.continuations; i++)
+ rc = opendir(ef, dir, &it);
+ if (rc != 0)
+ return rc;
+ for (;;)
{
- struct exfat_file_name name = {EXFAT_ENTRY_FILE_NAME, 0};
- memcpy(name.name, node->name + (i - 1) * EXFAT_ENAME_MAX,
+ 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, 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);
+ 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));
- checksum = exfat_add_checksum(&name, checksum);
+ next_entry(ef, dir, &cluster, &offset);
+ exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
+ co2o(ef, cluster, offset));
}
- meta1.checksum = cpu_to_le16(checksum);
- exfat_write_raw(&meta1, sizeof(meta1), node->meta1_offset, ef->fd);
- exfat_write_raw(&meta2, sizeof(meta2), node->meta2_offset, ef->fd);
+ init_node_meta1(node, &meta1);
+ init_node_meta2(node, &meta2);
- node->flags &= ~EXFAT_ATTRIB_DIRTY;
+ 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;
+ off_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), true);
+ 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,
+ 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);
+ 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;
+ off_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;
+ }
+
+ /* 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)
+ {
+ /* 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, off_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;
+ 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));
+ 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));
+ strcpy(ef->label, label);
+ return 0;
}
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