Home > Article > Backend Development > Here are a few options for an English title in a question format, capturing the essence of the article: **Short & Direct:** * **How to Preserve Sparse Files When Using io.Copy() in Go?** * **Can
io.Copy() transfers raw bytes between an io.Reader and an io.Writer. However, it lacks the ability to handle the location of holes within files, which is considered side-channel information that syscalls like read(2) conceal from users.
To manage sparse files, you must employ the syscall package and manually manipulate parameters. The SEEK_HOLE and SEEK_DATA values from lseek(2) are essential for this process.
Transferring files as sparse is more complex. On Linux, you can attempt to punch holes using fallocate(2) with FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE. If that fails, write zeroed blocks to the destination to encourage the OS to convert them to a hole.
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