pdflib（PDF里边图片怎么导出无背景）

LTFS数据和索引sync同步落带1.索引元数据落带时机:1)每5分钟(默认)2)umount3)close(需配置)4)setfattr-nuser.ltfs.sync/mnt/lto5/5)ltfs_fsops_volume_sync()(需手动调用)2.以设置user.ltfs.sync扩展属性为例,HPE代码调用过程1)数据落带:periodic_sync_thread_signal(periodic_sync_thread_cond)->periodic_sync_thread()->ltfs_fsops_flush()->iosched_flush()->iosched_ops.flush()回调->unified_flush()->ltfs_fsraw_write()->tape_write()->tape_ops.write()回调->ltotape_write()->ltotape_scsiexec(CMDwrite)->ioctl(ltotape_scsi_io_type.fd)2)索引落带periodic_sync_thread_signal(periodic_sync_thread_cond)->periodic_sync_thread()->ltfs_sync_index()->ltfs_write_index()->xml_schema_to_tape()->xmlOutputBufferCreateIO(xml_output_tape_write_callback)->xml_output_tape_write_callback()libxml2回调->tape_write()->tape_ops.write()回调->ltotape_write()->ltotape_scsiexec(CMDwrite)->ioctl(ltotape_scsi_io_type.fd)LTFS中的sync()网页链接HPEStoreOpen和LTFS最佳实践网页链接