void exfat_put_node(struct exfat* ef, struct exfat_node* node)
{
if (--node->references < 0)
{
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)
{
/* FIXME handle I/O error */
if (exfat_flush_node(ef, node) != 0)
exfat_bug("node flush failed");
if (node->flags & EXFAT_ATTRIB_UNLINKED)
{
/* free all clusters and node structure itself */
exfat_truncate(ef, node, 0, true);
free(node);
}
/* FIXME handle I/O error */
if (exfat_flush(ef) != 0)
exfat_bug("flush failed");
}
}
static int fuse_exfat_fsync(const char* path, int datasync,
struct fuse_file_info *fi)
{
int rc;
exfat_debug("[%s] %s", __func__, path);
rc = exfat_flush(&ef);
if (rc != 0)
return rc;
return exfat_fsync(ef.dev);
}
void exfat_unmount(struct exfat* ef)
{
exfat_flush_nodes(ef); /* ignore return code */
exfat_flush(ef); /* ignore return code */
exfat_put_node(ef, ef->root);
exfat_reset_cache(ef);
free(ef->root);
ef->root = NULL;
finalize_super_block(ef);
exfat_close(ef->dev); /* close descriptor immediately after fsync */
ef->dev = NULL;
free(ef->zero_cluster);
ef->zero_cluster = NULL;
free(ef->cmap.chunk);
ef->cmap.chunk = NULL;
free(ef->sb);
ef->sb = NULL;
free(ef->upcase);
ef->upcase = NULL;
ef->upcase_chars = 0;
}
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;
if (!(node->flags & EXFAT_ATTRIB_DIRTY))
return 0; /* no need to flush */
if (ef->ro)
exfat_bug("unable to flush node to read-only FS");
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");
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;
/* 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);
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;
}
node->flags &= ~EXFAT_ATTRIB_DIRTY;
return exfat_flush(ef);
}
