Use fancy and more efficient syscalls to copy (sparse) files on Linux #218
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larsewi
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The FICLONE ioctl() is the most efficient way to copy a file
inside one file system if available and supported.
copy_file_range() is an alternative that can provide similar
efficiency, but also only works inside one file system and
requires us to take care of holes in files. sendfile() is very
similar, but unline copy_file_range() it doesn't support
reflinks.
Ticket: CFE-4380
Changelog: FileSparseCopy() now uses FICLONE ioctl(),
copy_file_range() or sendfile() on Linux
platforms (if available)
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The FICLONE ioctl() is the most efficient way to copy a file inside one file system if available and supported. copy_file_range() is an alternative that can provide similar efficiency, but also only works inside one file system and requires us to take care of holes in files. sendfile() is very similar, but unline copy_file_range() it doesn't support reflinks.
Ticket: CFE-4380
Changelog: FileSparseCopy() now uses FICLONE ioctl(),
copy_file_range() or sendfile() on Linux
platforms (if available)